| /* DWARF 2 debugging format support for GDB. |
| |
| Copyright (C) 1994-2016 Free Software Foundation, Inc. |
| |
| Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology, |
| Inc. with support from Florida State University (under contract |
| with the Ada Joint Program Office), and Silicon Graphics, Inc. |
| Initial contribution by Brent Benson, Harris Computer Systems, Inc., |
| based on Fred Fish's (Cygnus Support) implementation of DWARF 1 |
| support. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| /* FIXME: Various die-reading functions need to be more careful with |
| reading off the end of the section. |
| E.g., load_partial_dies, read_partial_die. */ |
| |
| #include "defs.h" |
| #include "bfd.h" |
| #include "elf-bfd.h" |
| #include "symtab.h" |
| #include "gdbtypes.h" |
| #include "objfiles.h" |
| #include "dwarf2.h" |
| #include "buildsym.h" |
| #include "demangle.h" |
| #include "gdb-demangle.h" |
| #include "expression.h" |
| #include "filenames.h" /* for DOSish file names */ |
| #include "macrotab.h" |
| #include "language.h" |
| #include "complaints.h" |
| #include "bcache.h" |
| #include "dwarf2expr.h" |
| #include "dwarf2loc.h" |
| #include "cp-support.h" |
| #include "hashtab.h" |
| #include "command.h" |
| #include "gdbcmd.h" |
| #include "block.h" |
| #include "addrmap.h" |
| #include "typeprint.h" |
| #include "psympriv.h" |
| #include <sys/stat.h> |
| #include "completer.h" |
| #include "vec.h" |
| #include "c-lang.h" |
| #include "go-lang.h" |
| #include "valprint.h" |
| #include "gdbcore.h" /* for gnutarget */ |
| #include "gdb/gdb-index.h" |
| #include <ctype.h> |
| #include "gdb_bfd.h" |
| #include "f-lang.h" |
| #include "source.h" |
| #include "filestuff.h" |
| #include "build-id.h" |
| #include "namespace.h" |
| |
| #include <fcntl.h> |
| #include <sys/types.h> |
| #include <algorithm> |
| |
| typedef struct symbol *symbolp; |
| DEF_VEC_P (symbolp); |
| |
| /* When == 1, print basic high level tracing messages. |
| When > 1, be more verbose. |
| This is in contrast to the low level DIE reading of dwarf_die_debug. */ |
| static unsigned int dwarf_read_debug = 0; |
| |
| /* When non-zero, dump DIEs after they are read in. */ |
| static unsigned int dwarf_die_debug = 0; |
| |
| /* When non-zero, dump line number entries as they are read in. */ |
| static unsigned int dwarf_line_debug = 0; |
| |
| /* When non-zero, cross-check physname against demangler. */ |
| static int check_physname = 0; |
| |
| /* When non-zero, do not reject deprecated .gdb_index sections. */ |
| static int use_deprecated_index_sections = 0; |
| |
| static const struct objfile_data *dwarf2_objfile_data_key; |
| |
| /* The "aclass" indices for various kinds of computed DWARF symbols. */ |
| |
| static int dwarf2_locexpr_index; |
| static int dwarf2_loclist_index; |
| static int dwarf2_locexpr_block_index; |
| static int dwarf2_loclist_block_index; |
| |
| /* A descriptor for dwarf sections. |
| |
| S.ASECTION, SIZE are typically initialized when the objfile is first |
| scanned. BUFFER, READIN are filled in later when the section is read. |
| If the section contained compressed data then SIZE is updated to record |
| the uncompressed size of the section. |
| |
| DWP file format V2 introduces a wrinkle that is easiest to handle by |
| creating the concept of virtual sections contained within a real section. |
| In DWP V2 the sections of the input DWO files are concatenated together |
| into one section, but section offsets are kept relative to the original |
| input section. |
| If this is a virtual dwp-v2 section, S.CONTAINING_SECTION is a backlink to |
| the real section this "virtual" section is contained in, and BUFFER,SIZE |
| describe the virtual section. */ |
| |
| struct dwarf2_section_info |
| { |
| union |
| { |
| /* If this is a real section, the bfd section. */ |
| asection *section; |
| /* If this is a virtual section, pointer to the containing ("real") |
| section. */ |
| struct dwarf2_section_info *containing_section; |
| } s; |
| /* Pointer to section data, only valid if readin. */ |
| const gdb_byte *buffer; |
| /* The size of the section, real or virtual. */ |
| bfd_size_type size; |
| /* If this is a virtual section, the offset in the real section. |
| Only valid if is_virtual. */ |
| bfd_size_type virtual_offset; |
| /* True if we have tried to read this section. */ |
| char readin; |
| /* True if this is a virtual section, False otherwise. |
| This specifies which of s.section and s.containing_section to use. */ |
| char is_virtual; |
| }; |
| |
| typedef struct dwarf2_section_info dwarf2_section_info_def; |
| DEF_VEC_O (dwarf2_section_info_def); |
| |
| /* All offsets in the index are of this type. It must be |
| architecture-independent. */ |
| typedef uint32_t offset_type; |
| |
| DEF_VEC_I (offset_type); |
| |
| /* Ensure only legit values are used. */ |
| #define DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE(cu_index, value) \ |
| do { \ |
| gdb_assert ((unsigned int) (value) <= 1); \ |
| GDB_INDEX_SYMBOL_STATIC_SET_VALUE((cu_index), (value)); \ |
| } while (0) |
| |
| /* Ensure only legit values are used. */ |
| #define DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE(cu_index, value) \ |
| do { \ |
| gdb_assert ((value) >= GDB_INDEX_SYMBOL_KIND_TYPE \ |
| && (value) <= GDB_INDEX_SYMBOL_KIND_OTHER); \ |
| GDB_INDEX_SYMBOL_KIND_SET_VALUE((cu_index), (value)); \ |
| } while (0) |
| |
| /* Ensure we don't use more than the alloted nuber of bits for the CU. */ |
| #define DW2_GDB_INDEX_CU_SET_VALUE(cu_index, value) \ |
| do { \ |
| gdb_assert (((value) & ~GDB_INDEX_CU_MASK) == 0); \ |
| GDB_INDEX_CU_SET_VALUE((cu_index), (value)); \ |
| } while (0) |
| |
| /* A description of the mapped index. The file format is described in |
| a comment by the code that writes the index. */ |
| struct mapped_index |
| { |
| /* Index data format version. */ |
| int version; |
| |
| /* The total length of the buffer. */ |
| off_t total_size; |
| |
| /* A pointer to the address table data. */ |
| const gdb_byte *address_table; |
| |
| /* Size of the address table data in bytes. */ |
| offset_type address_table_size; |
| |
| /* The symbol table, implemented as a hash table. */ |
| const offset_type *symbol_table; |
| |
| /* Size in slots, each slot is 2 offset_types. */ |
| offset_type symbol_table_slots; |
| |
| /* A pointer to the constant pool. */ |
| const char *constant_pool; |
| }; |
| |
| typedef struct dwarf2_per_cu_data *dwarf2_per_cu_ptr; |
| DEF_VEC_P (dwarf2_per_cu_ptr); |
| |
| struct tu_stats |
| { |
| int nr_uniq_abbrev_tables; |
| int nr_symtabs; |
| int nr_symtab_sharers; |
| int nr_stmt_less_type_units; |
| int nr_all_type_units_reallocs; |
| }; |
| |
| /* Collection of data recorded per objfile. |
| This hangs off of dwarf2_objfile_data_key. */ |
| |
| struct dwarf2_per_objfile |
| { |
| struct dwarf2_section_info info; |
| struct dwarf2_section_info abbrev; |
| struct dwarf2_section_info line; |
| struct dwarf2_section_info loc; |
| struct dwarf2_section_info macinfo; |
| struct dwarf2_section_info macro; |
| struct dwarf2_section_info str; |
| struct dwarf2_section_info ranges; |
| struct dwarf2_section_info addr; |
| struct dwarf2_section_info frame; |
| struct dwarf2_section_info eh_frame; |
| struct dwarf2_section_info gdb_index; |
| |
| VEC (dwarf2_section_info_def) *types; |
| |
| /* Back link. */ |
| struct objfile *objfile; |
| |
| /* Table of all the compilation units. This is used to locate |
| the target compilation unit of a particular reference. */ |
| struct dwarf2_per_cu_data **all_comp_units; |
| |
| /* The number of compilation units in ALL_COMP_UNITS. */ |
| int n_comp_units; |
| |
| /* The number of .debug_types-related CUs. */ |
| int n_type_units; |
| |
| /* The number of elements allocated in all_type_units. |
| If there are skeleton-less TUs, we add them to all_type_units lazily. */ |
| int n_allocated_type_units; |
| |
| /* The .debug_types-related CUs (TUs). |
| This is stored in malloc space because we may realloc it. */ |
| struct signatured_type **all_type_units; |
| |
| /* Table of struct type_unit_group objects. |
| The hash key is the DW_AT_stmt_list value. */ |
| htab_t type_unit_groups; |
| |
| /* A table mapping .debug_types signatures to its signatured_type entry. |
| This is NULL if the .debug_types section hasn't been read in yet. */ |
| htab_t signatured_types; |
| |
| /* Type unit statistics, to see how well the scaling improvements |
| are doing. */ |
| struct tu_stats tu_stats; |
| |
| /* A chain of compilation units that are currently read in, so that |
| they can be freed later. */ |
| struct dwarf2_per_cu_data *read_in_chain; |
| |
| /* A table mapping DW_AT_dwo_name values to struct dwo_file objects. |
| This is NULL if the table hasn't been allocated yet. */ |
| htab_t dwo_files; |
| |
| /* Non-zero if we've check for whether there is a DWP file. */ |
| int dwp_checked; |
| |
| /* The DWP file if there is one, or NULL. */ |
| struct dwp_file *dwp_file; |
| |
| /* The shared '.dwz' file, if one exists. This is used when the |
| original data was compressed using 'dwz -m'. */ |
| struct dwz_file *dwz_file; |
| |
| /* A flag indicating wether this objfile has a section loaded at a |
| VMA of 0. */ |
| int has_section_at_zero; |
| |
| /* True if we are using the mapped index, |
| or we are faking it for OBJF_READNOW's sake. */ |
| unsigned char using_index; |
| |
| /* The mapped index, or NULL if .gdb_index is missing or not being used. */ |
| struct mapped_index *index_table; |
| |
| /* When using index_table, this keeps track of all quick_file_names entries. |
| TUs typically share line table entries with a CU, so we maintain a |
| separate table of all line table entries to support the sharing. |
| Note that while there can be way more TUs than CUs, we've already |
| sorted all the TUs into "type unit groups", grouped by their |
| DW_AT_stmt_list value. Therefore the only sharing done here is with a |
| CU and its associated TU group if there is one. */ |
| htab_t quick_file_names_table; |
| |
| /* Set during partial symbol reading, to prevent queueing of full |
| symbols. */ |
| int reading_partial_symbols; |
| |
| /* Table mapping type DIEs to their struct type *. |
| This is NULL if not allocated yet. |
| The mapping is done via (CU/TU + DIE offset) -> type. */ |
| htab_t die_type_hash; |
| |
| /* The CUs we recently read. */ |
| VEC (dwarf2_per_cu_ptr) *just_read_cus; |
| |
| /* Table containing line_header indexed by offset and offset_in_dwz. */ |
| htab_t line_header_hash; |
| }; |
| |
| static struct dwarf2_per_objfile *dwarf2_per_objfile; |
| |
| /* Default names of the debugging sections. */ |
| |
| /* Note that if the debugging section has been compressed, it might |
| have a name like .zdebug_info. */ |
| |
| static const struct dwarf2_debug_sections dwarf2_elf_names = |
| { |
| { ".debug_info", ".zdebug_info" }, |
| { ".debug_abbrev", ".zdebug_abbrev" }, |
| { ".debug_line", ".zdebug_line" }, |
| { ".debug_loc", ".zdebug_loc" }, |
| { ".debug_macinfo", ".zdebug_macinfo" }, |
| { ".debug_macro", ".zdebug_macro" }, |
| { ".debug_str", ".zdebug_str" }, |
| { ".debug_ranges", ".zdebug_ranges" }, |
| { ".debug_types", ".zdebug_types" }, |
| { ".debug_addr", ".zdebug_addr" }, |
| { ".debug_frame", ".zdebug_frame" }, |
| { ".eh_frame", NULL }, |
| { ".gdb_index", ".zgdb_index" }, |
| 23 |
| }; |
| |
| /* List of DWO/DWP sections. */ |
| |
| static const struct dwop_section_names |
| { |
| struct dwarf2_section_names abbrev_dwo; |
| struct dwarf2_section_names info_dwo; |
| struct dwarf2_section_names line_dwo; |
| struct dwarf2_section_names loc_dwo; |
| struct dwarf2_section_names macinfo_dwo; |
| struct dwarf2_section_names macro_dwo; |
| struct dwarf2_section_names str_dwo; |
| struct dwarf2_section_names str_offsets_dwo; |
| struct dwarf2_section_names types_dwo; |
| struct dwarf2_section_names cu_index; |
| struct dwarf2_section_names tu_index; |
| } |
| dwop_section_names = |
| { |
| { ".debug_abbrev.dwo", ".zdebug_abbrev.dwo" }, |
| { ".debug_info.dwo", ".zdebug_info.dwo" }, |
| { ".debug_line.dwo", ".zdebug_line.dwo" }, |
| { ".debug_loc.dwo", ".zdebug_loc.dwo" }, |
| { ".debug_macinfo.dwo", ".zdebug_macinfo.dwo" }, |
| { ".debug_macro.dwo", ".zdebug_macro.dwo" }, |
| { ".debug_str.dwo", ".zdebug_str.dwo" }, |
| { ".debug_str_offsets.dwo", ".zdebug_str_offsets.dwo" }, |
| { ".debug_types.dwo", ".zdebug_types.dwo" }, |
| { ".debug_cu_index", ".zdebug_cu_index" }, |
| { ".debug_tu_index", ".zdebug_tu_index" }, |
| }; |
| |
| /* local data types */ |
| |
| /* The data in a compilation unit header, after target2host |
| translation, looks like this. */ |
| struct comp_unit_head |
| { |
| unsigned int length; |
| short version; |
| unsigned char addr_size; |
| unsigned char signed_addr_p; |
| sect_offset abbrev_offset; |
| |
| /* Size of file offsets; either 4 or 8. */ |
| unsigned int offset_size; |
| |
| /* Size of the length field; either 4 or 12. */ |
| unsigned int initial_length_size; |
| |
| /* Offset to the first byte of this compilation unit header in the |
| .debug_info section, for resolving relative reference dies. */ |
| sect_offset offset; |
| |
| /* Offset to first die in this cu from the start of the cu. |
| This will be the first byte following the compilation unit header. */ |
| cu_offset first_die_offset; |
| }; |
| |
| /* Type used for delaying computation of method physnames. |
| See comments for compute_delayed_physnames. */ |
| struct delayed_method_info |
| { |
| /* The type to which the method is attached, i.e., its parent class. */ |
| struct type *type; |
| |
| /* The index of the method in the type's function fieldlists. */ |
| int fnfield_index; |
| |
| /* The index of the method in the fieldlist. */ |
| int index; |
| |
| /* The name of the DIE. */ |
| const char *name; |
| |
| /* The DIE associated with this method. */ |
| struct die_info *die; |
| }; |
| |
| typedef struct delayed_method_info delayed_method_info; |
| DEF_VEC_O (delayed_method_info); |
| |
| /* Internal state when decoding a particular compilation unit. */ |
| struct dwarf2_cu |
| { |
| /* The objfile containing this compilation unit. */ |
| struct objfile *objfile; |
| |
| /* The header of the compilation unit. */ |
| struct comp_unit_head header; |
| |
| /* Base address of this compilation unit. */ |
| CORE_ADDR base_address; |
| |
| /* Non-zero if base_address has been set. */ |
| int base_known; |
| |
| /* The language we are debugging. */ |
| enum language language; |
| const struct language_defn *language_defn; |
| |
| const char *producer; |
| |
| /* The generic symbol table building routines have separate lists for |
| file scope symbols and all all other scopes (local scopes). So |
| we need to select the right one to pass to add_symbol_to_list(). |
| We do it by keeping a pointer to the correct list in list_in_scope. |
| |
| FIXME: The original dwarf code just treated the file scope as the |
| first local scope, and all other local scopes as nested local |
| scopes, and worked fine. Check to see if we really need to |
| distinguish these in buildsym.c. */ |
| struct pending **list_in_scope; |
| |
| /* The abbrev table for this CU. |
| Normally this points to the abbrev table in the objfile. |
| But if DWO_UNIT is non-NULL this is the abbrev table in the DWO file. */ |
| struct abbrev_table *abbrev_table; |
| |
| /* Hash table holding all the loaded partial DIEs |
| with partial_die->offset.SECT_OFF as hash. */ |
| htab_t partial_dies; |
| |
| /* Storage for things with the same lifetime as this read-in compilation |
| unit, including partial DIEs. */ |
| struct obstack comp_unit_obstack; |
| |
| /* When multiple dwarf2_cu structures are living in memory, this field |
| chains them all together, so that they can be released efficiently. |
| We will probably also want a generation counter so that most-recently-used |
| compilation units are cached... */ |
| struct dwarf2_per_cu_data *read_in_chain; |
| |
| /* Backlink to our per_cu entry. */ |
| struct dwarf2_per_cu_data *per_cu; |
| |
| /* How many compilation units ago was this CU last referenced? */ |
| int last_used; |
| |
| /* A hash table of DIE cu_offset for following references with |
| die_info->offset.sect_off as hash. */ |
| htab_t die_hash; |
| |
| /* Full DIEs if read in. */ |
| struct die_info *dies; |
| |
| /* A set of pointers to dwarf2_per_cu_data objects for compilation |
| units referenced by this one. Only set during full symbol processing; |
| partial symbol tables do not have dependencies. */ |
| htab_t dependencies; |
| |
| /* Header data from the line table, during full symbol processing. */ |
| struct line_header *line_header; |
| |
| /* A list of methods which need to have physnames computed |
| after all type information has been read. */ |
| VEC (delayed_method_info) *method_list; |
| |
| /* To be copied to symtab->call_site_htab. */ |
| htab_t call_site_htab; |
| |
| /* Non-NULL if this CU came from a DWO file. |
| There is an invariant here that is important to remember: |
| Except for attributes copied from the top level DIE in the "main" |
| (or "stub") file in preparation for reading the DWO file |
| (e.g., DW_AT_GNU_addr_base), we KISS: there is only *one* CU. |
| Either there isn't a DWO file (in which case this is NULL and the point |
| is moot), or there is and either we're not going to read it (in which |
| case this is NULL) or there is and we are reading it (in which case this |
| is non-NULL). */ |
| struct dwo_unit *dwo_unit; |
| |
| /* The DW_AT_addr_base attribute if present, zero otherwise |
| (zero is a valid value though). |
| Note this value comes from the Fission stub CU/TU's DIE. */ |
| ULONGEST addr_base; |
| |
| /* The DW_AT_ranges_base attribute if present, zero otherwise |
| (zero is a valid value though). |
| Note this value comes from the Fission stub CU/TU's DIE. |
| Also note that the value is zero in the non-DWO case so this value can |
| be used without needing to know whether DWO files are in use or not. |
| N.B. This does not apply to DW_AT_ranges appearing in |
| DW_TAG_compile_unit dies. This is a bit of a wart, consider if ever |
| DW_AT_ranges appeared in the DW_TAG_compile_unit of DWO DIEs: then |
| DW_AT_ranges_base *would* have to be applied, and we'd have to care |
| whether the DW_AT_ranges attribute came from the skeleton or DWO. */ |
| ULONGEST ranges_base; |
| |
| /* Mark used when releasing cached dies. */ |
| unsigned int mark : 1; |
| |
| /* This CU references .debug_loc. See the symtab->locations_valid field. |
| This test is imperfect as there may exist optimized debug code not using |
| any location list and still facing inlining issues if handled as |
| unoptimized code. For a future better test see GCC PR other/32998. */ |
| unsigned int has_loclist : 1; |
| |
| /* These cache the results for producer_is_* fields. CHECKED_PRODUCER is set |
| if all the producer_is_* fields are valid. This information is cached |
| because profiling CU expansion showed excessive time spent in |
| producer_is_gxx_lt_4_6. */ |
| unsigned int checked_producer : 1; |
| unsigned int producer_is_gxx_lt_4_6 : 1; |
| unsigned int producer_is_gcc_lt_4_3 : 1; |
| unsigned int producer_is_icc : 1; |
| |
| /* When set, the file that we're processing is known to have |
| debugging info for C++ namespaces. GCC 3.3.x did not produce |
| this information, but later versions do. */ |
| |
| unsigned int processing_has_namespace_info : 1; |
| }; |
| |
| /* Persistent data held for a compilation unit, even when not |
| processing it. We put a pointer to this structure in the |
| read_symtab_private field of the psymtab. */ |
| |
| struct dwarf2_per_cu_data |
| { |
| /* The start offset and length of this compilation unit. |
| NOTE: Unlike comp_unit_head.length, this length includes |
| initial_length_size. |
| If the DIE refers to a DWO file, this is always of the original die, |
| not the DWO file. */ |
| sect_offset offset; |
| unsigned int length; |
| |
| /* Flag indicating this compilation unit will be read in before |
| any of the current compilation units are processed. */ |
| unsigned int queued : 1; |
| |
| /* This flag will be set when reading partial DIEs if we need to load |
| absolutely all DIEs for this compilation unit, instead of just the ones |
| we think are interesting. It gets set if we look for a DIE in the |
| hash table and don't find it. */ |
| unsigned int load_all_dies : 1; |
| |
| /* Non-zero if this CU is from .debug_types. |
| Struct dwarf2_per_cu_data is contained in struct signatured_type iff |
| this is non-zero. */ |
| unsigned int is_debug_types : 1; |
| |
| /* Non-zero if this CU is from the .dwz file. */ |
| unsigned int is_dwz : 1; |
| |
| /* Non-zero if reading a TU directly from a DWO file, bypassing the stub. |
| This flag is only valid if is_debug_types is true. |
| We can't read a CU directly from a DWO file: There are required |
| attributes in the stub. */ |
| unsigned int reading_dwo_directly : 1; |
| |
| /* Non-zero if the TU has been read. |
| This is used to assist the "Stay in DWO Optimization" for Fission: |
| When reading a DWO, it's faster to read TUs from the DWO instead of |
| fetching them from random other DWOs (due to comdat folding). |
| If the TU has already been read, the optimization is unnecessary |
| (and unwise - we don't want to change where gdb thinks the TU lives |
| "midflight"). |
| This flag is only valid if is_debug_types is true. */ |
| unsigned int tu_read : 1; |
| |
| /* The section this CU/TU lives in. |
| If the DIE refers to a DWO file, this is always the original die, |
| not the DWO file. */ |
| struct dwarf2_section_info *section; |
| |
| /* Set to non-NULL iff this CU is currently loaded. When it gets freed out |
| of the CU cache it gets reset to NULL again. This is left as NULL for |
| dummy CUs (a CU header, but nothing else). */ |
| struct dwarf2_cu *cu; |
| |
| /* The corresponding objfile. |
| Normally we can get the objfile from dwarf2_per_objfile. |
| However we can enter this file with just a "per_cu" handle. */ |
| struct objfile *objfile; |
| |
| /* When dwarf2_per_objfile->using_index is true, the 'quick' field |
| is active. Otherwise, the 'psymtab' field is active. */ |
| union |
| { |
| /* The partial symbol table associated with this compilation unit, |
| or NULL for unread partial units. */ |
| struct partial_symtab *psymtab; |
| |
| /* Data needed by the "quick" functions. */ |
| struct dwarf2_per_cu_quick_data *quick; |
| } v; |
| |
| /* The CUs we import using DW_TAG_imported_unit. This is filled in |
| while reading psymtabs, used to compute the psymtab dependencies, |
| and then cleared. Then it is filled in again while reading full |
| symbols, and only deleted when the objfile is destroyed. |
| |
| This is also used to work around a difference between the way gold |
| generates .gdb_index version <=7 and the way gdb does. Arguably this |
| is a gold bug. For symbols coming from TUs, gold records in the index |
| the CU that includes the TU instead of the TU itself. This breaks |
| dw2_lookup_symbol: It assumes that if the index says symbol X lives |
| in CU/TU Y, then one need only expand Y and a subsequent lookup in Y |
| will find X. Alas TUs live in their own symtab, so after expanding CU Y |
| we need to look in TU Z to find X. Fortunately, this is akin to |
| DW_TAG_imported_unit, so we just use the same mechanism: For |
| .gdb_index version <=7 this also records the TUs that the CU referred |
| to. Concurrently with this change gdb was modified to emit version 8 |
| indices so we only pay a price for gold generated indices. |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */ |
| VEC (dwarf2_per_cu_ptr) *imported_symtabs; |
| }; |
| |
| /* Entry in the signatured_types hash table. */ |
| |
| struct signatured_type |
| { |
| /* The "per_cu" object of this type. |
| This struct is used iff per_cu.is_debug_types. |
| N.B.: This is the first member so that it's easy to convert pointers |
| between them. */ |
| struct dwarf2_per_cu_data per_cu; |
| |
| /* The type's signature. */ |
| ULONGEST signature; |
| |
| /* Offset in the TU of the type's DIE, as read from the TU header. |
| If this TU is a DWO stub and the definition lives in a DWO file |
| (specified by DW_AT_GNU_dwo_name), this value is unusable. */ |
| cu_offset type_offset_in_tu; |
| |
| /* Offset in the section of the type's DIE. |
| If the definition lives in a DWO file, this is the offset in the |
| .debug_types.dwo section. |
| The value is zero until the actual value is known. |
| Zero is otherwise not a valid section offset. */ |
| sect_offset type_offset_in_section; |
| |
| /* Type units are grouped by their DW_AT_stmt_list entry so that they |
| can share them. This points to the containing symtab. */ |
| struct type_unit_group *type_unit_group; |
| |
| /* The type. |
| The first time we encounter this type we fully read it in and install it |
| in the symbol tables. Subsequent times we only need the type. */ |
| struct type *type; |
| |
| /* Containing DWO unit. |
| This field is valid iff per_cu.reading_dwo_directly. */ |
| struct dwo_unit *dwo_unit; |
| }; |
| |
| typedef struct signatured_type *sig_type_ptr; |
| DEF_VEC_P (sig_type_ptr); |
| |
| /* A struct that can be used as a hash key for tables based on DW_AT_stmt_list. |
| This includes type_unit_group and quick_file_names. */ |
| |
| struct stmt_list_hash |
| { |
| /* The DWO unit this table is from or NULL if there is none. */ |
| struct dwo_unit *dwo_unit; |
| |
| /* Offset in .debug_line or .debug_line.dwo. */ |
| sect_offset line_offset; |
| }; |
| |
| /* Each element of dwarf2_per_objfile->type_unit_groups is a pointer to |
| an object of this type. */ |
| |
| struct type_unit_group |
| { |
| /* dwarf2read.c's main "handle" on a TU symtab. |
| To simplify things we create an artificial CU that "includes" all the |
| type units using this stmt_list so that the rest of the code still has |
| a "per_cu" handle on the symtab. |
| This PER_CU is recognized by having no section. */ |
| #define IS_TYPE_UNIT_GROUP(per_cu) ((per_cu)->section == NULL) |
| struct dwarf2_per_cu_data per_cu; |
| |
| /* The TUs that share this DW_AT_stmt_list entry. |
| This is added to while parsing type units to build partial symtabs, |
| and is deleted afterwards and not used again. */ |
| VEC (sig_type_ptr) *tus; |
| |
| /* The compunit symtab. |
| Type units in a group needn't all be defined in the same source file, |
| so we create an essentially anonymous symtab as the compunit symtab. */ |
| struct compunit_symtab *compunit_symtab; |
| |
| /* The data used to construct the hash key. */ |
| struct stmt_list_hash hash; |
| |
| /* The number of symtabs from the line header. |
| The value here must match line_header.num_file_names. */ |
| unsigned int num_symtabs; |
| |
| /* The symbol tables for this TU (obtained from the files listed in |
| DW_AT_stmt_list). |
| WARNING: The order of entries here must match the order of entries |
| in the line header. After the first TU using this type_unit_group, the |
| line header for the subsequent TUs is recreated from this. This is done |
| because we need to use the same symtabs for each TU using the same |
| DW_AT_stmt_list value. Also note that symtabs may be repeated here, |
| there's no guarantee the line header doesn't have duplicate entries. */ |
| struct symtab **symtabs; |
| }; |
| |
| /* These sections are what may appear in a (real or virtual) DWO file. */ |
| |
| struct dwo_sections |
| { |
| struct dwarf2_section_info abbrev; |
| struct dwarf2_section_info line; |
| struct dwarf2_section_info loc; |
| struct dwarf2_section_info macinfo; |
| struct dwarf2_section_info macro; |
| struct dwarf2_section_info str; |
| struct dwarf2_section_info str_offsets; |
| /* In the case of a virtual DWO file, these two are unused. */ |
| struct dwarf2_section_info info; |
| VEC (dwarf2_section_info_def) *types; |
| }; |
| |
| /* CUs/TUs in DWP/DWO files. */ |
| |
| struct dwo_unit |
| { |
| /* Backlink to the containing struct dwo_file. */ |
| struct dwo_file *dwo_file; |
| |
| /* The "id" that distinguishes this CU/TU. |
| .debug_info calls this "dwo_id", .debug_types calls this "signature". |
| Since signatures came first, we stick with it for consistency. */ |
| ULONGEST signature; |
| |
| /* The section this CU/TU lives in, in the DWO file. */ |
| struct dwarf2_section_info *section; |
| |
| /* Same as dwarf2_per_cu_data:{offset,length} but in the DWO section. */ |
| sect_offset offset; |
| unsigned int length; |
| |
| /* For types, offset in the type's DIE of the type defined by this TU. */ |
| cu_offset type_offset_in_tu; |
| }; |
| |
| /* include/dwarf2.h defines the DWP section codes. |
| It defines a max value but it doesn't define a min value, which we |
| use for error checking, so provide one. */ |
| |
| enum dwp_v2_section_ids |
| { |
| DW_SECT_MIN = 1 |
| }; |
| |
| /* Data for one DWO file. |
| |
| This includes virtual DWO files (a virtual DWO file is a DWO file as it |
| appears in a DWP file). DWP files don't really have DWO files per se - |
| comdat folding of types "loses" the DWO file they came from, and from |
| a high level view DWP files appear to contain a mass of random types. |
| However, to maintain consistency with the non-DWP case we pretend DWP |
| files contain virtual DWO files, and we assign each TU with one virtual |
| DWO file (generally based on the line and abbrev section offsets - |
| a heuristic that seems to work in practice). */ |
| |
| struct dwo_file |
| { |
| /* The DW_AT_GNU_dwo_name attribute. |
| For virtual DWO files the name is constructed from the section offsets |
| of abbrev,line,loc,str_offsets so that we combine virtual DWO files |
| from related CU+TUs. */ |
| const char *dwo_name; |
| |
| /* The DW_AT_comp_dir attribute. */ |
| const char *comp_dir; |
| |
| /* The bfd, when the file is open. Otherwise this is NULL. |
| This is unused(NULL) for virtual DWO files where we use dwp_file.dbfd. */ |
| bfd *dbfd; |
| |
| /* The sections that make up this DWO file. |
| Remember that for virtual DWO files in DWP V2, these are virtual |
| sections (for lack of a better name). */ |
| struct dwo_sections sections; |
| |
| /* The CU in the file. |
| We only support one because having more than one requires hacking the |
| dwo_name of each to match, which is highly unlikely to happen. |
| Doing this means all TUs can share comp_dir: We also assume that |
| DW_AT_comp_dir across all TUs in a DWO file will be identical. */ |
| struct dwo_unit *cu; |
| |
| /* Table of TUs in the file. |
| Each element is a struct dwo_unit. */ |
| htab_t tus; |
| }; |
| |
| /* These sections are what may appear in a DWP file. */ |
| |
| struct dwp_sections |
| { |
| /* These are used by both DWP version 1 and 2. */ |
| struct dwarf2_section_info str; |
| struct dwarf2_section_info cu_index; |
| struct dwarf2_section_info tu_index; |
| |
| /* These are only used by DWP version 2 files. |
| In DWP version 1 the .debug_info.dwo, .debug_types.dwo, and other |
| sections are referenced by section number, and are not recorded here. |
| In DWP version 2 there is at most one copy of all these sections, each |
| section being (effectively) comprised of the concatenation of all of the |
| individual sections that exist in the version 1 format. |
| To keep the code simple we treat each of these concatenated pieces as a |
| section itself (a virtual section?). */ |
| struct dwarf2_section_info abbrev; |
| struct dwarf2_section_info info; |
| struct dwarf2_section_info line; |
| struct dwarf2_section_info loc; |
| struct dwarf2_section_info macinfo; |
| struct dwarf2_section_info macro; |
| struct dwarf2_section_info str_offsets; |
| struct dwarf2_section_info types; |
| }; |
| |
| /* These sections are what may appear in a virtual DWO file in DWP version 1. |
| A virtual DWO file is a DWO file as it appears in a DWP file. */ |
| |
| struct virtual_v1_dwo_sections |
| { |
| struct dwarf2_section_info abbrev; |
| struct dwarf2_section_info line; |
| struct dwarf2_section_info loc; |
| struct dwarf2_section_info macinfo; |
| struct dwarf2_section_info macro; |
| struct dwarf2_section_info str_offsets; |
| /* Each DWP hash table entry records one CU or one TU. |
| That is recorded here, and copied to dwo_unit.section. */ |
| struct dwarf2_section_info info_or_types; |
| }; |
| |
| /* Similar to virtual_v1_dwo_sections, but for DWP version 2. |
| In version 2, the sections of the DWO files are concatenated together |
| and stored in one section of that name. Thus each ELF section contains |
| several "virtual" sections. */ |
| |
| struct virtual_v2_dwo_sections |
| { |
| bfd_size_type abbrev_offset; |
| bfd_size_type abbrev_size; |
| |
| bfd_size_type line_offset; |
| bfd_size_type line_size; |
| |
| bfd_size_type loc_offset; |
| bfd_size_type loc_size; |
| |
| bfd_size_type macinfo_offset; |
| bfd_size_type macinfo_size; |
| |
| bfd_size_type macro_offset; |
| bfd_size_type macro_size; |
| |
| bfd_size_type str_offsets_offset; |
| bfd_size_type str_offsets_size; |
| |
| /* Each DWP hash table entry records one CU or one TU. |
| That is recorded here, and copied to dwo_unit.section. */ |
| bfd_size_type info_or_types_offset; |
| bfd_size_type info_or_types_size; |
| }; |
| |
| /* Contents of DWP hash tables. */ |
| |
| struct dwp_hash_table |
| { |
| uint32_t version, nr_columns; |
| uint32_t nr_units, nr_slots; |
| const gdb_byte *hash_table, *unit_table; |
| union |
| { |
| struct |
| { |
| const gdb_byte *indices; |
| } v1; |
| struct |
| { |
| /* This is indexed by column number and gives the id of the section |
| in that column. */ |
| #define MAX_NR_V2_DWO_SECTIONS \ |
| (1 /* .debug_info or .debug_types */ \ |
| + 1 /* .debug_abbrev */ \ |
| + 1 /* .debug_line */ \ |
| + 1 /* .debug_loc */ \ |
| + 1 /* .debug_str_offsets */ \ |
| + 1 /* .debug_macro or .debug_macinfo */) |
| int section_ids[MAX_NR_V2_DWO_SECTIONS]; |
| const gdb_byte *offsets; |
| const gdb_byte *sizes; |
| } v2; |
| } section_pool; |
| }; |
| |
| /* Data for one DWP file. */ |
| |
| struct dwp_file |
| { |
| /* Name of the file. */ |
| const char *name; |
| |
| /* File format version. */ |
| int version; |
| |
| /* The bfd. */ |
| bfd *dbfd; |
| |
| /* Section info for this file. */ |
| struct dwp_sections sections; |
| |
| /* Table of CUs in the file. */ |
| const struct dwp_hash_table *cus; |
| |
| /* Table of TUs in the file. */ |
| const struct dwp_hash_table *tus; |
| |
| /* Tables of loaded CUs/TUs. Each entry is a struct dwo_unit *. */ |
| htab_t loaded_cus; |
| htab_t loaded_tus; |
| |
| /* Table to map ELF section numbers to their sections. |
| This is only needed for the DWP V1 file format. */ |
| unsigned int num_sections; |
| asection **elf_sections; |
| }; |
| |
| /* This represents a '.dwz' file. */ |
| |
| struct dwz_file |
| { |
| /* A dwz file can only contain a few sections. */ |
| struct dwarf2_section_info abbrev; |
| struct dwarf2_section_info info; |
| struct dwarf2_section_info str; |
| struct dwarf2_section_info line; |
| struct dwarf2_section_info macro; |
| struct dwarf2_section_info gdb_index; |
| |
| /* The dwz's BFD. */ |
| bfd *dwz_bfd; |
| }; |
| |
| /* Struct used to pass misc. parameters to read_die_and_children, et |
| al. which are used for both .debug_info and .debug_types dies. |
| All parameters here are unchanging for the life of the call. This |
| struct exists to abstract away the constant parameters of die reading. */ |
| |
| struct die_reader_specs |
| { |
| /* The bfd of die_section. */ |
| bfd* abfd; |
| |
| /* The CU of the DIE we are parsing. */ |
| struct dwarf2_cu *cu; |
| |
| /* Non-NULL if reading a DWO file (including one packaged into a DWP). */ |
| struct dwo_file *dwo_file; |
| |
| /* The section the die comes from. |
| This is either .debug_info or .debug_types, or the .dwo variants. */ |
| struct dwarf2_section_info *die_section; |
| |
| /* die_section->buffer. */ |
| const gdb_byte *buffer; |
| |
| /* The end of the buffer. */ |
| const gdb_byte *buffer_end; |
| |
| /* The value of the DW_AT_comp_dir attribute. */ |
| const char *comp_dir; |
| }; |
| |
| /* Type of function passed to init_cutu_and_read_dies, et.al. */ |
| typedef void (die_reader_func_ftype) (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data); |
| |
| struct file_entry |
| { |
| const char *name; |
| unsigned int dir_index; |
| unsigned int mod_time; |
| unsigned int length; |
| /* Non-zero if referenced by the Line Number Program. */ |
| int included_p; |
| /* The associated symbol table, if any. */ |
| struct symtab *symtab; |
| }; |
| |
| /* The line number information for a compilation unit (found in the |
| .debug_line section) begins with a "statement program header", |
| which contains the following information. */ |
| struct line_header |
| { |
| /* Offset of line number information in .debug_line section. */ |
| sect_offset offset; |
| |
| /* OFFSET is for struct dwz_file associated with dwarf2_per_objfile. */ |
| unsigned offset_in_dwz : 1; |
| |
| unsigned int total_length; |
| unsigned short version; |
| unsigned int header_length; |
| unsigned char minimum_instruction_length; |
| unsigned char maximum_ops_per_instruction; |
| unsigned char default_is_stmt; |
| int line_base; |
| unsigned char line_range; |
| unsigned char opcode_base; |
| |
| /* standard_opcode_lengths[i] is the number of operands for the |
| standard opcode whose value is i. This means that |
| standard_opcode_lengths[0] is unused, and the last meaningful |
| element is standard_opcode_lengths[opcode_base - 1]. */ |
| unsigned char *standard_opcode_lengths; |
| |
| /* The include_directories table. NOTE! These strings are not |
| allocated with xmalloc; instead, they are pointers into |
| debug_line_buffer. If you try to free them, `free' will get |
| indigestion. */ |
| unsigned int num_include_dirs, include_dirs_size; |
| const char **include_dirs; |
| |
| /* The file_names table. NOTE! These strings are not allocated |
| with xmalloc; instead, they are pointers into debug_line_buffer. |
| Don't try to free them directly. */ |
| unsigned int num_file_names, file_names_size; |
| struct file_entry *file_names; |
| |
| /* The start and end of the statement program following this |
| header. These point into dwarf2_per_objfile->line_buffer. */ |
| const gdb_byte *statement_program_start, *statement_program_end; |
| }; |
| |
| /* When we construct a partial symbol table entry we only |
| need this much information. */ |
| struct partial_die_info |
| { |
| /* Offset of this DIE. */ |
| sect_offset offset; |
| |
| /* DWARF-2 tag for this DIE. */ |
| ENUM_BITFIELD(dwarf_tag) tag : 16; |
| |
| /* Assorted flags describing the data found in this DIE. */ |
| unsigned int has_children : 1; |
| unsigned int is_external : 1; |
| unsigned int is_declaration : 1; |
| unsigned int has_type : 1; |
| unsigned int has_specification : 1; |
| unsigned int has_pc_info : 1; |
| unsigned int may_be_inlined : 1; |
| |
| /* Flag set if the SCOPE field of this structure has been |
| computed. */ |
| unsigned int scope_set : 1; |
| |
| /* Flag set if the DIE has a byte_size attribute. */ |
| unsigned int has_byte_size : 1; |
| |
| /* Flag set if the DIE has a DW_AT_const_value attribute. */ |
| unsigned int has_const_value : 1; |
| |
| /* Flag set if any of the DIE's children are template arguments. */ |
| unsigned int has_template_arguments : 1; |
| |
| /* Flag set if fixup_partial_die has been called on this die. */ |
| unsigned int fixup_called : 1; |
| |
| /* Flag set if DW_TAG_imported_unit uses DW_FORM_GNU_ref_alt. */ |
| unsigned int is_dwz : 1; |
| |
| /* Flag set if spec_offset uses DW_FORM_GNU_ref_alt. */ |
| unsigned int spec_is_dwz : 1; |
| |
| /* The name of this DIE. Normally the value of DW_AT_name, but |
| sometimes a default name for unnamed DIEs. */ |
| const char *name; |
| |
| /* The linkage name, if present. */ |
| const char *linkage_name; |
| |
| /* The scope to prepend to our children. This is generally |
| allocated on the comp_unit_obstack, so will disappear |
| when this compilation unit leaves the cache. */ |
| const char *scope; |
| |
| /* Some data associated with the partial DIE. The tag determines |
| which field is live. */ |
| union |
| { |
| /* The location description associated with this DIE, if any. */ |
| struct dwarf_block *locdesc; |
| /* The offset of an import, for DW_TAG_imported_unit. */ |
| sect_offset offset; |
| } d; |
| |
| /* If HAS_PC_INFO, the PC range associated with this DIE. */ |
| CORE_ADDR lowpc; |
| CORE_ADDR highpc; |
| |
| /* Pointer into the info_buffer (or types_buffer) pointing at the target of |
| DW_AT_sibling, if any. */ |
| /* NOTE: This member isn't strictly necessary, read_partial_die could |
| return DW_AT_sibling values to its caller load_partial_dies. */ |
| const gdb_byte *sibling; |
| |
| /* If HAS_SPECIFICATION, the offset of the DIE referred to by |
| DW_AT_specification (or DW_AT_abstract_origin or |
| DW_AT_extension). */ |
| sect_offset spec_offset; |
| |
| /* Pointers to this DIE's parent, first child, and next sibling, |
| if any. */ |
| struct partial_die_info *die_parent, *die_child, *die_sibling; |
| }; |
| |
| /* This data structure holds the information of an abbrev. */ |
| struct abbrev_info |
| { |
| unsigned int number; /* number identifying abbrev */ |
| enum dwarf_tag tag; /* dwarf tag */ |
| unsigned short has_children; /* boolean */ |
| unsigned short num_attrs; /* number of attributes */ |
| struct attr_abbrev *attrs; /* an array of attribute descriptions */ |
| struct abbrev_info *next; /* next in chain */ |
| }; |
| |
| struct attr_abbrev |
| { |
| ENUM_BITFIELD(dwarf_attribute) name : 16; |
| ENUM_BITFIELD(dwarf_form) form : 16; |
| }; |
| |
| /* Size of abbrev_table.abbrev_hash_table. */ |
| #define ABBREV_HASH_SIZE 121 |
| |
| /* Top level data structure to contain an abbreviation table. */ |
| |
| struct abbrev_table |
| { |
| /* Where the abbrev table came from. |
| This is used as a sanity check when the table is used. */ |
| sect_offset offset; |
| |
| /* Storage for the abbrev table. */ |
| struct obstack abbrev_obstack; |
| |
| /* Hash table of abbrevs. |
| This is an array of size ABBREV_HASH_SIZE allocated in abbrev_obstack. |
| It could be statically allocated, but the previous code didn't so we |
| don't either. */ |
| struct abbrev_info **abbrevs; |
| }; |
| |
| /* Attributes have a name and a value. */ |
| struct attribute |
| { |
| ENUM_BITFIELD(dwarf_attribute) name : 16; |
| ENUM_BITFIELD(dwarf_form) form : 15; |
| |
| /* Has DW_STRING already been updated by dwarf2_canonicalize_name? This |
| field should be in u.str (existing only for DW_STRING) but it is kept |
| here for better struct attribute alignment. */ |
| unsigned int string_is_canonical : 1; |
| |
| union |
| { |
| const char *str; |
| struct dwarf_block *blk; |
| ULONGEST unsnd; |
| LONGEST snd; |
| CORE_ADDR addr; |
| ULONGEST signature; |
| } |
| u; |
| }; |
| |
| /* This data structure holds a complete die structure. */ |
| struct die_info |
| { |
| /* DWARF-2 tag for this DIE. */ |
| ENUM_BITFIELD(dwarf_tag) tag : 16; |
| |
| /* Number of attributes */ |
| unsigned char num_attrs; |
| |
| /* True if we're presently building the full type name for the |
| type derived from this DIE. */ |
| unsigned char building_fullname : 1; |
| |
| /* True if this die is in process. PR 16581. */ |
| unsigned char in_process : 1; |
| |
| /* Abbrev number */ |
| unsigned int abbrev; |
| |
| /* Offset in .debug_info or .debug_types section. */ |
| sect_offset offset; |
| |
| /* The dies in a compilation unit form an n-ary tree. PARENT |
| points to this die's parent; CHILD points to the first child of |
| this node; and all the children of a given node are chained |
| together via their SIBLING fields. */ |
| struct die_info *child; /* Its first child, if any. */ |
| struct die_info *sibling; /* Its next sibling, if any. */ |
| struct die_info *parent; /* Its parent, if any. */ |
| |
| /* An array of attributes, with NUM_ATTRS elements. There may be |
| zero, but it's not common and zero-sized arrays are not |
| sufficiently portable C. */ |
| struct attribute attrs[1]; |
| }; |
| |
| /* Get at parts of an attribute structure. */ |
| |
| #define DW_STRING(attr) ((attr)->u.str) |
| #define DW_STRING_IS_CANONICAL(attr) ((attr)->string_is_canonical) |
| #define DW_UNSND(attr) ((attr)->u.unsnd) |
| #define DW_BLOCK(attr) ((attr)->u.blk) |
| #define DW_SND(attr) ((attr)->u.snd) |
| #define DW_ADDR(attr) ((attr)->u.addr) |
| #define DW_SIGNATURE(attr) ((attr)->u.signature) |
| |
| /* Blocks are a bunch of untyped bytes. */ |
| struct dwarf_block |
| { |
| size_t size; |
| |
| /* Valid only if SIZE is not zero. */ |
| const gdb_byte *data; |
| }; |
| |
| #ifndef ATTR_ALLOC_CHUNK |
| #define ATTR_ALLOC_CHUNK 4 |
| #endif |
| |
| /* Allocate fields for structs, unions and enums in this size. */ |
| #ifndef DW_FIELD_ALLOC_CHUNK |
| #define DW_FIELD_ALLOC_CHUNK 4 |
| #endif |
| |
| /* FIXME: We might want to set this from BFD via bfd_arch_bits_per_byte, |
| but this would require a corresponding change in unpack_field_as_long |
| and friends. */ |
| static int bits_per_byte = 8; |
| |
| struct nextfield |
| { |
| struct nextfield *next; |
| int accessibility; |
| int virtuality; |
| struct field field; |
| }; |
| |
| struct nextfnfield |
| { |
| struct nextfnfield *next; |
| struct fn_field fnfield; |
| }; |
| |
| struct fnfieldlist |
| { |
| const char *name; |
| int length; |
| struct nextfnfield *head; |
| }; |
| |
| struct typedef_field_list |
| { |
| struct typedef_field field; |
| struct typedef_field_list *next; |
| }; |
| |
| /* The routines that read and process dies for a C struct or C++ class |
| pass lists of data member fields and lists of member function fields |
| in an instance of a field_info structure, as defined below. */ |
| struct field_info |
| { |
| /* List of data member and baseclasses fields. */ |
| struct nextfield *fields, *baseclasses; |
| |
| /* Number of fields (including baseclasses). */ |
| int nfields; |
| |
| /* Number of baseclasses. */ |
| int nbaseclasses; |
| |
| /* Set if the accesibility of one of the fields is not public. */ |
| int non_public_fields; |
| |
| /* Member function fields array, entries are allocated in the order they |
| are encountered in the object file. */ |
| struct nextfnfield *fnfields; |
| |
| /* Member function fieldlist array, contains name of possibly overloaded |
| member function, number of overloaded member functions and a pointer |
| to the head of the member function field chain. */ |
| struct fnfieldlist *fnfieldlists; |
| |
| /* Number of entries in the fnfieldlists array. */ |
| int nfnfields; |
| |
| /* typedefs defined inside this class. TYPEDEF_FIELD_LIST contains head of |
| a NULL terminated list of TYPEDEF_FIELD_LIST_COUNT elements. */ |
| struct typedef_field_list *typedef_field_list; |
| unsigned typedef_field_list_count; |
| }; |
| |
| /* One item on the queue of compilation units to read in full symbols |
| for. */ |
| struct dwarf2_queue_item |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| enum language pretend_language; |
| struct dwarf2_queue_item *next; |
| }; |
| |
| /* The current queue. */ |
| static struct dwarf2_queue_item *dwarf2_queue, *dwarf2_queue_tail; |
| |
| /* Loaded secondary compilation units are kept in memory until they |
| have not been referenced for the processing of this many |
| compilation units. Set this to zero to disable caching. Cache |
| sizes of up to at least twenty will improve startup time for |
| typical inter-CU-reference binaries, at an obvious memory cost. */ |
| static int dwarf_max_cache_age = 5; |
| static void |
| show_dwarf_max_cache_age (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| fprintf_filtered (file, _("The upper bound on the age of cached " |
| "DWARF compilation units is %s.\n"), |
| value); |
| } |
| |
| /* local function prototypes */ |
| |
| static const char *get_section_name (const struct dwarf2_section_info *); |
| |
| static const char *get_section_file_name (const struct dwarf2_section_info *); |
| |
| static void dwarf2_locate_sections (bfd *, asection *, void *); |
| |
| static void dwarf2_find_base_address (struct die_info *die, |
| struct dwarf2_cu *cu); |
| |
| static struct partial_symtab *create_partial_symtab |
| (struct dwarf2_per_cu_data *per_cu, const char *name); |
| |
| static void dwarf2_build_psymtabs_hard (struct objfile *); |
| |
| static void scan_partial_symbols (struct partial_die_info *, |
| CORE_ADDR *, CORE_ADDR *, |
| int, struct dwarf2_cu *); |
| |
| static void add_partial_symbol (struct partial_die_info *, |
| struct dwarf2_cu *); |
| |
| static void add_partial_namespace (struct partial_die_info *pdi, |
| CORE_ADDR *lowpc, CORE_ADDR *highpc, |
| int set_addrmap, struct dwarf2_cu *cu); |
| |
| static void add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, |
| CORE_ADDR *highpc, int set_addrmap, |
| struct dwarf2_cu *cu); |
| |
| static void add_partial_enumeration (struct partial_die_info *enum_pdi, |
| struct dwarf2_cu *cu); |
| |
| static void add_partial_subprogram (struct partial_die_info *pdi, |
| CORE_ADDR *lowpc, CORE_ADDR *highpc, |
| int need_pc, struct dwarf2_cu *cu); |
| |
| static void dwarf2_read_symtab (struct partial_symtab *, |
| struct objfile *); |
| |
| static void psymtab_to_symtab_1 (struct partial_symtab *); |
| |
| static struct abbrev_info *abbrev_table_lookup_abbrev |
| (const struct abbrev_table *, unsigned int); |
| |
| static struct abbrev_table *abbrev_table_read_table |
| (struct dwarf2_section_info *, sect_offset); |
| |
| static void abbrev_table_free (struct abbrev_table *); |
| |
| static void abbrev_table_free_cleanup (void *); |
| |
| static void dwarf2_read_abbrevs (struct dwarf2_cu *, |
| struct dwarf2_section_info *); |
| |
| static void dwarf2_free_abbrev_table (void *); |
| |
| static unsigned int peek_abbrev_code (bfd *, const gdb_byte *); |
| |
| static struct partial_die_info *load_partial_dies |
| (const struct die_reader_specs *, const gdb_byte *, int); |
| |
| static const gdb_byte *read_partial_die (const struct die_reader_specs *, |
| struct partial_die_info *, |
| struct abbrev_info *, |
| unsigned int, |
| const gdb_byte *); |
| |
| static struct partial_die_info *find_partial_die (sect_offset, int, |
| struct dwarf2_cu *); |
| |
| static void fixup_partial_die (struct partial_die_info *, |
| struct dwarf2_cu *); |
| |
| static const gdb_byte *read_attribute (const struct die_reader_specs *, |
| struct attribute *, struct attr_abbrev *, |
| const gdb_byte *); |
| |
| static unsigned int read_1_byte (bfd *, const gdb_byte *); |
| |
| static int read_1_signed_byte (bfd *, const gdb_byte *); |
| |
| static unsigned int read_2_bytes (bfd *, const gdb_byte *); |
| |
| static unsigned int read_4_bytes (bfd *, const gdb_byte *); |
| |
| static ULONGEST read_8_bytes (bfd *, const gdb_byte *); |
| |
| static CORE_ADDR read_address (bfd *, const gdb_byte *ptr, struct dwarf2_cu *, |
| unsigned int *); |
| |
| static LONGEST read_initial_length (bfd *, const gdb_byte *, unsigned int *); |
| |
| static LONGEST read_checked_initial_length_and_offset |
| (bfd *, const gdb_byte *, const struct comp_unit_head *, |
| unsigned int *, unsigned int *); |
| |
| static LONGEST read_offset (bfd *, const gdb_byte *, |
| const struct comp_unit_head *, |
| unsigned int *); |
| |
| static LONGEST read_offset_1 (bfd *, const gdb_byte *, unsigned int); |
| |
| static sect_offset read_abbrev_offset (struct dwarf2_section_info *, |
| sect_offset); |
| |
| static const gdb_byte *read_n_bytes (bfd *, const gdb_byte *, unsigned int); |
| |
| static const char *read_direct_string (bfd *, const gdb_byte *, unsigned int *); |
| |
| static const char *read_indirect_string (bfd *, const gdb_byte *, |
| const struct comp_unit_head *, |
| unsigned int *); |
| |
| static const char *read_indirect_string_from_dwz (struct dwz_file *, LONGEST); |
| |
| static ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *); |
| |
| static LONGEST read_signed_leb128 (bfd *, const gdb_byte *, unsigned int *); |
| |
| static CORE_ADDR read_addr_index_from_leb128 (struct dwarf2_cu *, |
| const gdb_byte *, |
| unsigned int *); |
| |
| static const char *read_str_index (const struct die_reader_specs *reader, |
| ULONGEST str_index); |
| |
| static void set_cu_language (unsigned int, struct dwarf2_cu *); |
| |
| static struct attribute *dwarf2_attr (struct die_info *, unsigned int, |
| struct dwarf2_cu *); |
| |
| static struct attribute *dwarf2_attr_no_follow (struct die_info *, |
| unsigned int); |
| |
| static const char *dwarf2_string_attr (struct die_info *die, unsigned int name, |
| struct dwarf2_cu *cu); |
| |
| static int dwarf2_flag_true_p (struct die_info *die, unsigned name, |
| struct dwarf2_cu *cu); |
| |
| static int die_is_declaration (struct die_info *, struct dwarf2_cu *cu); |
| |
| static struct die_info *die_specification (struct die_info *die, |
| struct dwarf2_cu **); |
| |
| static void free_line_header (struct line_header *lh); |
| |
| static struct line_header *dwarf_decode_line_header (unsigned int offset, |
| struct dwarf2_cu *cu); |
| |
| static void dwarf_decode_lines (struct line_header *, const char *, |
| struct dwarf2_cu *, struct partial_symtab *, |
| CORE_ADDR, int decode_mapping); |
| |
| static void dwarf2_start_subfile (const char *, const char *); |
| |
| static struct compunit_symtab *dwarf2_start_symtab (struct dwarf2_cu *, |
| const char *, const char *, |
| CORE_ADDR); |
| |
| static struct symbol *new_symbol (struct die_info *, struct type *, |
| struct dwarf2_cu *); |
| |
| static struct symbol *new_symbol_full (struct die_info *, struct type *, |
| struct dwarf2_cu *, struct symbol *); |
| |
| static void dwarf2_const_value (const struct attribute *, struct symbol *, |
| struct dwarf2_cu *); |
| |
| static void dwarf2_const_value_attr (const struct attribute *attr, |
| struct type *type, |
| const char *name, |
| struct obstack *obstack, |
| struct dwarf2_cu *cu, LONGEST *value, |
| const gdb_byte **bytes, |
| struct dwarf2_locexpr_baton **baton); |
| |
| static struct type *die_type (struct die_info *, struct dwarf2_cu *); |
| |
| static int need_gnat_info (struct dwarf2_cu *); |
| |
| static struct type *die_descriptive_type (struct die_info *, |
| struct dwarf2_cu *); |
| |
| static void set_descriptive_type (struct type *, struct die_info *, |
| struct dwarf2_cu *); |
| |
| static struct type *die_containing_type (struct die_info *, |
| struct dwarf2_cu *); |
| |
| static struct type *lookup_die_type (struct die_info *, const struct attribute *, |
| struct dwarf2_cu *); |
| |
| static struct type *read_type_die (struct die_info *, struct dwarf2_cu *); |
| |
| static struct type *read_type_die_1 (struct die_info *, struct dwarf2_cu *); |
| |
| static const char *determine_prefix (struct die_info *die, struct dwarf2_cu *); |
| |
| static char *typename_concat (struct obstack *obs, const char *prefix, |
| const char *suffix, int physname, |
| struct dwarf2_cu *cu); |
| |
| static void read_file_scope (struct die_info *, struct dwarf2_cu *); |
| |
| static void read_type_unit_scope (struct die_info *, struct dwarf2_cu *); |
| |
| static void read_func_scope (struct die_info *, struct dwarf2_cu *); |
| |
| static void read_lexical_block_scope (struct die_info *, struct dwarf2_cu *); |
| |
| static void read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu); |
| |
| static int dwarf2_ranges_read (unsigned, CORE_ADDR *, CORE_ADDR *, |
| struct dwarf2_cu *, struct partial_symtab *); |
| |
| /* How dwarf2_get_pc_bounds constructed its *LOWPC and *HIGHPC return |
| values. Keep the items ordered with increasing constraints compliance. */ |
| enum pc_bounds_kind |
| { |
| /* No attribute DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges was found. */ |
| PC_BOUNDS_NOT_PRESENT, |
| |
| /* Some of the attributes DW_AT_low_pc, DW_AT_high_pc or DW_AT_ranges |
| were present but they do not form a valid range of PC addresses. */ |
| PC_BOUNDS_INVALID, |
| |
| /* Discontiguous range was found - that is DW_AT_ranges was found. */ |
| PC_BOUNDS_RANGES, |
| |
| /* Contiguous range was found - DW_AT_low_pc and DW_AT_high_pc were found. */ |
| PC_BOUNDS_HIGH_LOW, |
| }; |
| |
| static enum pc_bounds_kind dwarf2_get_pc_bounds (struct die_info *, |
| CORE_ADDR *, CORE_ADDR *, |
| struct dwarf2_cu *, |
| struct partial_symtab *); |
| |
| static void get_scope_pc_bounds (struct die_info *, |
| CORE_ADDR *, CORE_ADDR *, |
| struct dwarf2_cu *); |
| |
| static void dwarf2_record_block_ranges (struct die_info *, struct block *, |
| CORE_ADDR, struct dwarf2_cu *); |
| |
| static void dwarf2_add_field (struct field_info *, struct die_info *, |
| struct dwarf2_cu *); |
| |
| static void dwarf2_attach_fields_to_type (struct field_info *, |
| struct type *, struct dwarf2_cu *); |
| |
| static void dwarf2_add_member_fn (struct field_info *, |
| struct die_info *, struct type *, |
| struct dwarf2_cu *); |
| |
| static void dwarf2_attach_fn_fields_to_type (struct field_info *, |
| struct type *, |
| struct dwarf2_cu *); |
| |
| static void process_structure_scope (struct die_info *, struct dwarf2_cu *); |
| |
| static void read_common_block (struct die_info *, struct dwarf2_cu *); |
| |
| static void read_namespace (struct die_info *die, struct dwarf2_cu *); |
| |
| static void read_module (struct die_info *die, struct dwarf2_cu *cu); |
| |
| static struct using_direct **using_directives (enum language); |
| |
| static void read_import_statement (struct die_info *die, struct dwarf2_cu *); |
| |
| static int read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu); |
| |
| static struct type *read_module_type (struct die_info *die, |
| struct dwarf2_cu *cu); |
| |
| static const char *namespace_name (struct die_info *die, |
| int *is_anonymous, struct dwarf2_cu *); |
| |
| static void process_enumeration_scope (struct die_info *, struct dwarf2_cu *); |
| |
| static CORE_ADDR decode_locdesc (struct dwarf_block *, struct dwarf2_cu *); |
| |
| static enum dwarf_array_dim_ordering read_array_order (struct die_info *, |
| struct dwarf2_cu *); |
| |
| static struct die_info *read_die_and_siblings_1 |
| (const struct die_reader_specs *, const gdb_byte *, const gdb_byte **, |
| struct die_info *); |
| |
| static struct die_info *read_die_and_siblings (const struct die_reader_specs *, |
| const gdb_byte *info_ptr, |
| const gdb_byte **new_info_ptr, |
| struct die_info *parent); |
| |
| static const gdb_byte *read_full_die_1 (const struct die_reader_specs *, |
| struct die_info **, const gdb_byte *, |
| int *, int); |
| |
| static const gdb_byte *read_full_die (const struct die_reader_specs *, |
| struct die_info **, const gdb_byte *, |
| int *); |
| |
| static void process_die (struct die_info *, struct dwarf2_cu *); |
| |
| static const char *dwarf2_canonicalize_name (const char *, struct dwarf2_cu *, |
| struct obstack *); |
| |
| static const char *dwarf2_name (struct die_info *die, struct dwarf2_cu *); |
| |
| static const char *dwarf2_full_name (const char *name, |
| struct die_info *die, |
| struct dwarf2_cu *cu); |
| |
| static const char *dwarf2_physname (const char *name, struct die_info *die, |
| struct dwarf2_cu *cu); |
| |
| static struct die_info *dwarf2_extension (struct die_info *die, |
| struct dwarf2_cu **); |
| |
| static const char *dwarf_tag_name (unsigned int); |
| |
| static const char *dwarf_attr_name (unsigned int); |
| |
| static const char *dwarf_form_name (unsigned int); |
| |
| static char *dwarf_bool_name (unsigned int); |
| |
| static const char *dwarf_type_encoding_name (unsigned int); |
| |
| static struct die_info *sibling_die (struct die_info *); |
| |
| static void dump_die_shallow (struct ui_file *, int indent, struct die_info *); |
| |
| static void dump_die_for_error (struct die_info *); |
| |
| static void dump_die_1 (struct ui_file *, int level, int max_level, |
| struct die_info *); |
| |
| /*static*/ void dump_die (struct die_info *, int max_level); |
| |
| static void store_in_ref_table (struct die_info *, |
| struct dwarf2_cu *); |
| |
| static sect_offset dwarf2_get_ref_die_offset (const struct attribute *); |
| |
| static LONGEST dwarf2_get_attr_constant_value (const struct attribute *, int); |
| |
| static struct die_info *follow_die_ref_or_sig (struct die_info *, |
| const struct attribute *, |
| struct dwarf2_cu **); |
| |
| static struct die_info *follow_die_ref (struct die_info *, |
| const struct attribute *, |
| struct dwarf2_cu **); |
| |
| static struct die_info *follow_die_sig (struct die_info *, |
| const struct attribute *, |
| struct dwarf2_cu **); |
| |
| static struct type *get_signatured_type (struct die_info *, ULONGEST, |
| struct dwarf2_cu *); |
| |
| static struct type *get_DW_AT_signature_type (struct die_info *, |
| const struct attribute *, |
| struct dwarf2_cu *); |
| |
| static void load_full_type_unit (struct dwarf2_per_cu_data *per_cu); |
| |
| static void read_signatured_type (struct signatured_type *); |
| |
| static int attr_to_dynamic_prop (const struct attribute *attr, |
| struct die_info *die, struct dwarf2_cu *cu, |
| struct dynamic_prop *prop); |
| |
| /* memory allocation interface */ |
| |
| static struct dwarf_block *dwarf_alloc_block (struct dwarf2_cu *); |
| |
| static struct die_info *dwarf_alloc_die (struct dwarf2_cu *, int); |
| |
| static void dwarf_decode_macros (struct dwarf2_cu *, unsigned int, int); |
| |
| static int attr_form_is_block (const struct attribute *); |
| |
| static int attr_form_is_section_offset (const struct attribute *); |
| |
| static int attr_form_is_constant (const struct attribute *); |
| |
| static int attr_form_is_ref (const struct attribute *); |
| |
| static void fill_in_loclist_baton (struct dwarf2_cu *cu, |
| struct dwarf2_loclist_baton *baton, |
| const struct attribute *attr); |
| |
| static void dwarf2_symbol_mark_computed (const struct attribute *attr, |
| struct symbol *sym, |
| struct dwarf2_cu *cu, |
| int is_block); |
| |
| static const gdb_byte *skip_one_die (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct abbrev_info *abbrev); |
| |
| static void free_stack_comp_unit (void *); |
| |
| static hashval_t partial_die_hash (const void *item); |
| |
| static int partial_die_eq (const void *item_lhs, const void *item_rhs); |
| |
| static struct dwarf2_per_cu_data *dwarf2_find_containing_comp_unit |
| (sect_offset offset, unsigned int offset_in_dwz, struct objfile *objfile); |
| |
| static void init_one_comp_unit (struct dwarf2_cu *cu, |
| struct dwarf2_per_cu_data *per_cu); |
| |
| static void prepare_one_comp_unit (struct dwarf2_cu *cu, |
| struct die_info *comp_unit_die, |
| enum language pretend_language); |
| |
| static void free_heap_comp_unit (void *); |
| |
| static void free_cached_comp_units (void *); |
| |
| static void age_cached_comp_units (void); |
| |
| static void free_one_cached_comp_unit (struct dwarf2_per_cu_data *); |
| |
| static struct type *set_die_type (struct die_info *, struct type *, |
| struct dwarf2_cu *); |
| |
| static void create_all_comp_units (struct objfile *); |
| |
| static int create_all_type_units (struct objfile *); |
| |
| static void load_full_comp_unit (struct dwarf2_per_cu_data *, |
| enum language); |
| |
| static void process_full_comp_unit (struct dwarf2_per_cu_data *, |
| enum language); |
| |
| static void process_full_type_unit (struct dwarf2_per_cu_data *, |
| enum language); |
| |
| static void dwarf2_add_dependence (struct dwarf2_cu *, |
| struct dwarf2_per_cu_data *); |
| |
| static void dwarf2_mark (struct dwarf2_cu *); |
| |
| static void dwarf2_clear_marks (struct dwarf2_per_cu_data *); |
| |
| static struct type *get_die_type_at_offset (sect_offset, |
| struct dwarf2_per_cu_data *); |
| |
| static struct type *get_die_type (struct die_info *die, struct dwarf2_cu *cu); |
| |
| static void dwarf2_release_queue (void *dummy); |
| |
| static void queue_comp_unit (struct dwarf2_per_cu_data *per_cu, |
| enum language pretend_language); |
| |
| static void process_queue (void); |
| |
| static void find_file_and_directory (struct die_info *die, |
| struct dwarf2_cu *cu, |
| const char **name, const char **comp_dir); |
| |
| static char *file_full_name (int file, struct line_header *lh, |
| const char *comp_dir); |
| |
| static const gdb_byte *read_and_check_comp_unit_head |
| (struct comp_unit_head *header, |
| struct dwarf2_section_info *section, |
| struct dwarf2_section_info *abbrev_section, const gdb_byte *info_ptr, |
| int is_debug_types_section); |
| |
| static void init_cutu_and_read_dies |
| (struct dwarf2_per_cu_data *this_cu, struct abbrev_table *abbrev_table, |
| int use_existing_cu, int keep, |
| die_reader_func_ftype *die_reader_func, void *data); |
| |
| static void init_cutu_and_read_dies_simple |
| (struct dwarf2_per_cu_data *this_cu, |
| die_reader_func_ftype *die_reader_func, void *data); |
| |
| static htab_t allocate_signatured_type_table (struct objfile *objfile); |
| |
| static htab_t allocate_dwo_unit_table (struct objfile *objfile); |
| |
| static struct dwo_unit *lookup_dwo_unit_in_dwp |
| (struct dwp_file *dwp_file, const char *comp_dir, |
| ULONGEST signature, int is_debug_types); |
| |
| static struct dwp_file *get_dwp_file (void); |
| |
| static struct dwo_unit *lookup_dwo_comp_unit |
| (struct dwarf2_per_cu_data *, const char *, const char *, ULONGEST); |
| |
| static struct dwo_unit *lookup_dwo_type_unit |
| (struct signatured_type *, const char *, const char *); |
| |
| static void queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *); |
| |
| static void free_dwo_file_cleanup (void *); |
| |
| static void process_cu_includes (void); |
| |
| static void check_producer (struct dwarf2_cu *cu); |
| |
| static void free_line_header_voidp (void *arg); |
| |
| /* Various complaints about symbol reading that don't abort the process. */ |
| |
| static void |
| dwarf2_statement_list_fits_in_line_number_section_complaint (void) |
| { |
| complaint (&symfile_complaints, |
| _("statement list doesn't fit in .debug_line section")); |
| } |
| |
| static void |
| dwarf2_debug_line_missing_file_complaint (void) |
| { |
| complaint (&symfile_complaints, |
| _(".debug_line section has line data without a file")); |
| } |
| |
| static void |
| dwarf2_debug_line_missing_end_sequence_complaint (void) |
| { |
| complaint (&symfile_complaints, |
| _(".debug_line section has line " |
| "program sequence without an end")); |
| } |
| |
| static void |
| dwarf2_complex_location_expr_complaint (void) |
| { |
| complaint (&symfile_complaints, _("location expression too complex")); |
| } |
| |
| static void |
| dwarf2_const_value_length_mismatch_complaint (const char *arg1, int arg2, |
| int arg3) |
| { |
| complaint (&symfile_complaints, |
| _("const value length mismatch for '%s', got %d, expected %d"), |
| arg1, arg2, arg3); |
| } |
| |
| static void |
| dwarf2_section_buffer_overflow_complaint (struct dwarf2_section_info *section) |
| { |
| complaint (&symfile_complaints, |
| _("debug info runs off end of %s section" |
| " [in module %s]"), |
| get_section_name (section), |
| get_section_file_name (section)); |
| } |
| |
| static void |
| dwarf2_macro_malformed_definition_complaint (const char *arg1) |
| { |
| complaint (&symfile_complaints, |
| _("macro debug info contains a " |
| "malformed macro definition:\n`%s'"), |
| arg1); |
| } |
| |
| static void |
| dwarf2_invalid_attrib_class_complaint (const char *arg1, const char *arg2) |
| { |
| complaint (&symfile_complaints, |
| _("invalid attribute class or form for '%s' in '%s'"), |
| arg1, arg2); |
| } |
| |
| /* Hash function for line_header_hash. */ |
| |
| static hashval_t |
| line_header_hash (const struct line_header *ofs) |
| { |
| return ofs->offset.sect_off ^ ofs->offset_in_dwz; |
| } |
| |
| /* Hash function for htab_create_alloc_ex for line_header_hash. */ |
| |
| static hashval_t |
| line_header_hash_voidp (const void *item) |
| { |
| const struct line_header *ofs = (const struct line_header *) item; |
| |
| return line_header_hash (ofs); |
| } |
| |
| /* Equality function for line_header_hash. */ |
| |
| static int |
| line_header_eq_voidp (const void *item_lhs, const void *item_rhs) |
| { |
| const struct line_header *ofs_lhs = (const struct line_header *) item_lhs; |
| const struct line_header *ofs_rhs = (const struct line_header *) item_rhs; |
| |
| return (ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off |
| && ofs_lhs->offset_in_dwz == ofs_rhs->offset_in_dwz); |
| } |
| |
| |
| #if WORDS_BIGENDIAN |
| |
| /* Convert VALUE between big- and little-endian. */ |
| static offset_type |
| byte_swap (offset_type value) |
| { |
| offset_type result; |
| |
| result = (value & 0xff) << 24; |
| result |= (value & 0xff00) << 8; |
| result |= (value & 0xff0000) >> 8; |
| result |= (value & 0xff000000) >> 24; |
| return result; |
| } |
| |
| #define MAYBE_SWAP(V) byte_swap (V) |
| |
| #else |
| #define MAYBE_SWAP(V) (V) |
| #endif /* WORDS_BIGENDIAN */ |
| |
| /* Read the given attribute value as an address, taking the attribute's |
| form into account. */ |
| |
| static CORE_ADDR |
| attr_value_as_address (struct attribute *attr) |
| { |
| CORE_ADDR addr; |
| |
| if (attr->form != DW_FORM_addr && attr->form != DW_FORM_GNU_addr_index) |
| { |
| /* Aside from a few clearly defined exceptions, attributes that |
| contain an address must always be in DW_FORM_addr form. |
| Unfortunately, some compilers happen to be violating this |
| requirement by encoding addresses using other forms, such |
| as DW_FORM_data4 for example. For those broken compilers, |
| we try to do our best, without any guarantee of success, |
| to interpret the address correctly. It would also be nice |
| to generate a complaint, but that would require us to maintain |
| a list of legitimate cases where a non-address form is allowed, |
| as well as update callers to pass in at least the CU's DWARF |
| version. This is more overhead than what we're willing to |
| expand for a pretty rare case. */ |
| addr = DW_UNSND (attr); |
| } |
| else |
| addr = DW_ADDR (attr); |
| |
| return addr; |
| } |
| |
| /* The suffix for an index file. */ |
| #define INDEX_SUFFIX ".gdb-index" |
| |
| /* Try to locate the sections we need for DWARF 2 debugging |
| information and return true if we have enough to do something. |
| NAMES points to the dwarf2 section names, or is NULL if the standard |
| ELF names are used. */ |
| |
| int |
| dwarf2_has_info (struct objfile *objfile, |
| const struct dwarf2_debug_sections *names) |
| { |
| dwarf2_per_objfile = ((struct dwarf2_per_objfile *) |
| objfile_data (objfile, dwarf2_objfile_data_key)); |
| if (!dwarf2_per_objfile) |
| { |
| /* Initialize per-objfile state. */ |
| struct dwarf2_per_objfile *data |
| = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_objfile); |
| |
| memset (data, 0, sizeof (*data)); |
| set_objfile_data (objfile, dwarf2_objfile_data_key, data); |
| dwarf2_per_objfile = data; |
| |
| bfd_map_over_sections (objfile->obfd, dwarf2_locate_sections, |
| (void *) names); |
| dwarf2_per_objfile->objfile = objfile; |
| } |
| return (!dwarf2_per_objfile->info.is_virtual |
| && dwarf2_per_objfile->info.s.section != NULL |
| && !dwarf2_per_objfile->abbrev.is_virtual |
| && dwarf2_per_objfile->abbrev.s.section != NULL); |
| } |
| |
| /* Return the containing section of virtual section SECTION. */ |
| |
| static struct dwarf2_section_info * |
| get_containing_section (const struct dwarf2_section_info *section) |
| { |
| gdb_assert (section->is_virtual); |
| return section->s.containing_section; |
| } |
| |
| /* Return the bfd owner of SECTION. */ |
| |
| static struct bfd * |
| get_section_bfd_owner (const struct dwarf2_section_info *section) |
| { |
| if (section->is_virtual) |
| { |
| section = get_containing_section (section); |
| gdb_assert (!section->is_virtual); |
| } |
| return section->s.section->owner; |
| } |
| |
| /* Return the bfd section of SECTION. |
| Returns NULL if the section is not present. */ |
| |
| static asection * |
| get_section_bfd_section (const struct dwarf2_section_info *section) |
| { |
| if (section->is_virtual) |
| { |
| section = get_containing_section (section); |
| gdb_assert (!section->is_virtual); |
| } |
| return section->s.section; |
| } |
| |
| /* Return the name of SECTION. */ |
| |
| static const char * |
| get_section_name (const struct dwarf2_section_info *section) |
| { |
| asection *sectp = get_section_bfd_section (section); |
| |
| gdb_assert (sectp != NULL); |
| return bfd_section_name (get_section_bfd_owner (section), sectp); |
| } |
| |
| /* Return the name of the file SECTION is in. */ |
| |
| static const char * |
| get_section_file_name (const struct dwarf2_section_info *section) |
| { |
| bfd *abfd = get_section_bfd_owner (section); |
| |
| return bfd_get_filename (abfd); |
| } |
| |
| /* Return the id of SECTION. |
| Returns 0 if SECTION doesn't exist. */ |
| |
| static int |
| get_section_id (const struct dwarf2_section_info *section) |
| { |
| asection *sectp = get_section_bfd_section (section); |
| |
| if (sectp == NULL) |
| return 0; |
| return sectp->id; |
| } |
| |
| /* Return the flags of SECTION. |
| SECTION (or containing section if this is a virtual section) must exist. */ |
| |
| static int |
| get_section_flags (const struct dwarf2_section_info *section) |
| { |
| asection *sectp = get_section_bfd_section (section); |
| |
| gdb_assert (sectp != NULL); |
| return bfd_get_section_flags (sectp->owner, sectp); |
| } |
| |
| /* When loading sections, we look either for uncompressed section or for |
| compressed section names. */ |
| |
| static int |
| section_is_p (const char *section_name, |
| const struct dwarf2_section_names *names) |
| { |
| if (names->normal != NULL |
| && strcmp (section_name, names->normal) == 0) |
| return 1; |
| if (names->compressed != NULL |
| && strcmp (section_name, names->compressed) == 0) |
| return 1; |
| return 0; |
| } |
| |
| /* This function is mapped across the sections and remembers the |
| offset and size of each of the debugging sections we are interested |
| in. */ |
| |
| static void |
| dwarf2_locate_sections (bfd *abfd, asection *sectp, void *vnames) |
| { |
| const struct dwarf2_debug_sections *names; |
| flagword aflag = bfd_get_section_flags (abfd, sectp); |
| |
| if (vnames == NULL) |
| names = &dwarf2_elf_names; |
| else |
| names = (const struct dwarf2_debug_sections *) vnames; |
| |
| if ((aflag & SEC_HAS_CONTENTS) == 0) |
| { |
| } |
| else if (section_is_p (sectp->name, &names->info)) |
| { |
| dwarf2_per_objfile->info.s.section = sectp; |
| dwarf2_per_objfile->info.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->abbrev)) |
| { |
| dwarf2_per_objfile->abbrev.s.section = sectp; |
| dwarf2_per_objfile->abbrev.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->line)) |
| { |
| dwarf2_per_objfile->line.s.section = sectp; |
| dwarf2_per_objfile->line.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->loc)) |
| { |
| dwarf2_per_objfile->loc.s.section = sectp; |
| dwarf2_per_objfile->loc.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macinfo)) |
| { |
| dwarf2_per_objfile->macinfo.s.section = sectp; |
| dwarf2_per_objfile->macinfo.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macro)) |
| { |
| dwarf2_per_objfile->macro.s.section = sectp; |
| dwarf2_per_objfile->macro.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->str)) |
| { |
| dwarf2_per_objfile->str.s.section = sectp; |
| dwarf2_per_objfile->str.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->addr)) |
| { |
| dwarf2_per_objfile->addr.s.section = sectp; |
| dwarf2_per_objfile->addr.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->frame)) |
| { |
| dwarf2_per_objfile->frame.s.section = sectp; |
| dwarf2_per_objfile->frame.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->eh_frame)) |
| { |
| dwarf2_per_objfile->eh_frame.s.section = sectp; |
| dwarf2_per_objfile->eh_frame.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->ranges)) |
| { |
| dwarf2_per_objfile->ranges.s.section = sectp; |
| dwarf2_per_objfile->ranges.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->types)) |
| { |
| struct dwarf2_section_info type_section; |
| |
| memset (&type_section, 0, sizeof (type_section)); |
| type_section.s.section = sectp; |
| type_section.size = bfd_get_section_size (sectp); |
| |
| VEC_safe_push (dwarf2_section_info_def, dwarf2_per_objfile->types, |
| &type_section); |
| } |
| else if (section_is_p (sectp->name, &names->gdb_index)) |
| { |
| dwarf2_per_objfile->gdb_index.s.section = sectp; |
| dwarf2_per_objfile->gdb_index.size = bfd_get_section_size (sectp); |
| } |
| |
| if ((bfd_get_section_flags (abfd, sectp) & (SEC_LOAD | SEC_ALLOC)) |
| && bfd_section_vma (abfd, sectp) == 0) |
| dwarf2_per_objfile->has_section_at_zero = 1; |
| } |
| |
| /* A helper function that decides whether a section is empty, |
| or not present. */ |
| |
| static int |
| dwarf2_section_empty_p (const struct dwarf2_section_info *section) |
| { |
| if (section->is_virtual) |
| return section->size == 0; |
| return section->s.section == NULL || section->size == 0; |
| } |
| |
| /* Read the contents of the section INFO. |
| OBJFILE is the main object file, but not necessarily the file where |
| the section comes from. E.g., for DWO files the bfd of INFO is the bfd |
| of the DWO file. |
| If the section is compressed, uncompress it before returning. */ |
| |
| static void |
| dwarf2_read_section (struct objfile *objfile, struct dwarf2_section_info *info) |
| { |
| asection *sectp; |
| bfd *abfd; |
| gdb_byte *buf, *retbuf; |
| |
| if (info->readin) |
| return; |
| info->buffer = NULL; |
| info->readin = 1; |
| |
| if (dwarf2_section_empty_p (info)) |
| return; |
| |
| sectp = get_section_bfd_section (info); |
| |
| /* If this is a virtual section we need to read in the real one first. */ |
| if (info->is_virtual) |
| { |
| struct dwarf2_section_info *containing_section = |
| get_containing_section (info); |
| |
| gdb_assert (sectp != NULL); |
| if ((sectp->flags & SEC_RELOC) != 0) |
| { |
| error (_("Dwarf Error: DWP format V2 with relocations is not" |
| " supported in section %s [in module %s]"), |
| get_section_name (info), get_section_file_name (info)); |
| } |
| dwarf2_read_section (objfile, containing_section); |
| /* Other code should have already caught virtual sections that don't |
| fit. */ |
| gdb_assert (info->virtual_offset + info->size |
| <= containing_section->size); |
| /* If the real section is empty or there was a problem reading the |
| section we shouldn't get here. */ |
| gdb_assert (containing_section->buffer != NULL); |
| info->buffer = containing_section->buffer + info->virtual_offset; |
| return; |
| } |
| |
| /* If the section has relocations, we must read it ourselves. |
| Otherwise we attach it to the BFD. */ |
| if ((sectp->flags & SEC_RELOC) == 0) |
| { |
| info->buffer = gdb_bfd_map_section (sectp, &info->size); |
| return; |
| } |
| |
| buf = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, info->size); |
| info->buffer = buf; |
| |
| /* When debugging .o files, we may need to apply relocations; see |
| http://sourceware.org/ml/gdb-patches/2002-04/msg00136.html . |
| We never compress sections in .o files, so we only need to |
| try this when the section is not compressed. */ |
| retbuf = symfile_relocate_debug_section (objfile, sectp, buf); |
| if (retbuf != NULL) |
| { |
| info->buffer = retbuf; |
| return; |
| } |
| |
| abfd = get_section_bfd_owner (info); |
| gdb_assert (abfd != NULL); |
| |
| if (bfd_seek (abfd, sectp->filepos, SEEK_SET) != 0 |
| || bfd_bread (buf, info->size, abfd) != info->size) |
| { |
| error (_("Dwarf Error: Can't read DWARF data" |
| " in section %s [in module %s]"), |
| bfd_section_name (abfd, sectp), bfd_get_filename (abfd)); |
| } |
| } |
| |
| /* A helper function that returns the size of a section in a safe way. |
| If you are positive that the section has been read before using the |
| size, then it is safe to refer to the dwarf2_section_info object's |
| "size" field directly. In other cases, you must call this |
| function, because for compressed sections the size field is not set |
| correctly until the section has been read. */ |
| |
| static bfd_size_type |
| dwarf2_section_size (struct objfile *objfile, |
| struct dwarf2_section_info *info) |
| { |
| if (!info->readin) |
| dwarf2_read_section (objfile, info); |
| return info->size; |
| } |
| |
| /* Fill in SECTP, BUFP and SIZEP with section info, given OBJFILE and |
| SECTION_NAME. */ |
| |
| void |
| dwarf2_get_section_info (struct objfile *objfile, |
| enum dwarf2_section_enum sect, |
| asection **sectp, const gdb_byte **bufp, |
| bfd_size_type *sizep) |
| { |
| struct dwarf2_per_objfile *data |
| = (struct dwarf2_per_objfile *) objfile_data (objfile, |
| dwarf2_objfile_data_key); |
| struct dwarf2_section_info *info; |
| |
| /* We may see an objfile without any DWARF, in which case we just |
| return nothing. */ |
| if (data == NULL) |
| { |
| *sectp = NULL; |
| *bufp = NULL; |
| *sizep = 0; |
| return; |
| } |
| switch (sect) |
| { |
| case DWARF2_DEBUG_FRAME: |
| info = &data->frame; |
| break; |
| case DWARF2_EH_FRAME: |
| info = &data->eh_frame; |
| break; |
| default: |
| gdb_assert_not_reached ("unexpected section"); |
| } |
| |
| dwarf2_read_section (objfile, info); |
| |
| *sectp = get_section_bfd_section (info); |
| *bufp = info->buffer; |
| *sizep = info->size; |
| } |
| |
| /* A helper function to find the sections for a .dwz file. */ |
| |
| static void |
| locate_dwz_sections (bfd *abfd, asection *sectp, void *arg) |
| { |
| struct dwz_file *dwz_file = (struct dwz_file *) arg; |
| |
| /* Note that we only support the standard ELF names, because .dwz |
| is ELF-only (at the time of writing). */ |
| if (section_is_p (sectp->name, &dwarf2_elf_names.abbrev)) |
| { |
| dwz_file->abbrev.s.section = sectp; |
| dwz_file->abbrev.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &dwarf2_elf_names.info)) |
| { |
| dwz_file->info.s.section = sectp; |
| dwz_file->info.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &dwarf2_elf_names.str)) |
| { |
| dwz_file->str.s.section = sectp; |
| dwz_file->str.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &dwarf2_elf_names.line)) |
| { |
| dwz_file->line.s.section = sectp; |
| dwz_file->line.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &dwarf2_elf_names.macro)) |
| { |
| dwz_file->macro.s.section = sectp; |
| dwz_file->macro.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &dwarf2_elf_names.gdb_index)) |
| { |
| dwz_file->gdb_index.s.section = sectp; |
| dwz_file->gdb_index.size = bfd_get_section_size (sectp); |
| } |
| } |
| |
| /* Open the separate '.dwz' debug file, if needed. Return NULL if |
| there is no .gnu_debugaltlink section in the file. Error if there |
| is such a section but the file cannot be found. */ |
| |
| static struct dwz_file * |
| dwarf2_get_dwz_file (void) |
| { |
| bfd *dwz_bfd; |
| char *data; |
| struct cleanup *cleanup; |
| const char *filename; |
| struct dwz_file *result; |
| bfd_size_type buildid_len_arg; |
| size_t buildid_len; |
| bfd_byte *buildid; |
| |
| if (dwarf2_per_objfile->dwz_file != NULL) |
| return dwarf2_per_objfile->dwz_file; |
| |
| bfd_set_error (bfd_error_no_error); |
| data = bfd_get_alt_debug_link_info (dwarf2_per_objfile->objfile->obfd, |
| &buildid_len_arg, &buildid); |
| if (data == NULL) |
| { |
| if (bfd_get_error () == bfd_error_no_error) |
| return NULL; |
| error (_("could not read '.gnu_debugaltlink' section: %s"), |
| bfd_errmsg (bfd_get_error ())); |
| } |
| cleanup = make_cleanup (xfree, data); |
| make_cleanup (xfree, buildid); |
| |
| buildid_len = (size_t) buildid_len_arg; |
| |
| filename = (const char *) data; |
| if (!IS_ABSOLUTE_PATH (filename)) |
| { |
| char *abs = gdb_realpath (objfile_name (dwarf2_per_objfile->objfile)); |
| char *rel; |
| |
| make_cleanup (xfree, abs); |
| abs = ldirname (abs); |
| make_cleanup (xfree, abs); |
| |
| rel = concat (abs, SLASH_STRING, filename, (char *) NULL); |
| make_cleanup (xfree, rel); |
| filename = rel; |
| } |
| |
| /* First try the file name given in the section. If that doesn't |
| work, try to use the build-id instead. */ |
| dwz_bfd = gdb_bfd_open (filename, gnutarget, -1); |
| if (dwz_bfd != NULL) |
| { |
| if (!build_id_verify (dwz_bfd, buildid_len, buildid)) |
| { |
| gdb_bfd_unref (dwz_bfd); |
| dwz_bfd = NULL; |
| } |
| } |
| |
| if (dwz_bfd == NULL) |
| dwz_bfd = build_id_to_debug_bfd (buildid_len, buildid); |
| |
| if (dwz_bfd == NULL) |
| error (_("could not find '.gnu_debugaltlink' file for %s"), |
| objfile_name (dwarf2_per_objfile->objfile)); |
| |
| result = OBSTACK_ZALLOC (&dwarf2_per_objfile->objfile->objfile_obstack, |
| struct dwz_file); |
| result->dwz_bfd = dwz_bfd; |
| |
| bfd_map_over_sections (dwz_bfd, locate_dwz_sections, result); |
| |
| do_cleanups (cleanup); |
| |
| gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, dwz_bfd); |
| dwarf2_per_objfile->dwz_file = result; |
| return result; |
| } |
| |
| /* DWARF quick_symbols_functions support. */ |
| |
| /* TUs can share .debug_line entries, and there can be a lot more TUs than |
| unique line tables, so we maintain a separate table of all .debug_line |
| derived entries to support the sharing. |
| All the quick functions need is the list of file names. We discard the |
| line_header when we're done and don't need to record it here. */ |
| struct quick_file_names |
| { |
| /* The data used to construct the hash key. */ |
| struct stmt_list_hash hash; |
| |
| /* The number of entries in file_names, real_names. */ |
| unsigned int num_file_names; |
| |
| /* The file names from the line table, after being run through |
| file_full_name. */ |
| const char **file_names; |
| |
| /* The file names from the line table after being run through |
| gdb_realpath. These are computed lazily. */ |
| const char **real_names; |
| }; |
| |
| /* When using the index (and thus not using psymtabs), each CU has an |
| object of this type. This is used to hold information needed by |
| the various "quick" methods. */ |
| struct dwarf2_per_cu_quick_data |
| { |
| /* The file table. This can be NULL if there was no file table |
| or it's currently not read in. |
| NOTE: This points into dwarf2_per_objfile->quick_file_names_table. */ |
| struct quick_file_names *file_names; |
| |
| /* The corresponding symbol table. This is NULL if symbols for this |
| CU have not yet been read. */ |
| struct compunit_symtab *compunit_symtab; |
| |
| /* A temporary mark bit used when iterating over all CUs in |
| expand_symtabs_matching. */ |
| unsigned int mark : 1; |
| |
| /* True if we've tried to read the file table and found there isn't one. |
| There will be no point in trying to read it again next time. */ |
| unsigned int no_file_data : 1; |
| }; |
| |
| /* Utility hash function for a stmt_list_hash. */ |
| |
| static hashval_t |
| hash_stmt_list_entry (const struct stmt_list_hash *stmt_list_hash) |
| { |
| hashval_t v = 0; |
| |
| if (stmt_list_hash->dwo_unit != NULL) |
| v += (uintptr_t) stmt_list_hash->dwo_unit->dwo_file; |
| v += stmt_list_hash->line_offset.sect_off; |
| return v; |
| } |
| |
| /* Utility equality function for a stmt_list_hash. */ |
| |
| static int |
| eq_stmt_list_entry (const struct stmt_list_hash *lhs, |
| const struct stmt_list_hash *rhs) |
| { |
| if ((lhs->dwo_unit != NULL) != (rhs->dwo_unit != NULL)) |
| return 0; |
| if (lhs->dwo_unit != NULL |
| && lhs->dwo_unit->dwo_file != rhs->dwo_unit->dwo_file) |
| return 0; |
| |
| return lhs->line_offset.sect_off == rhs->line_offset.sect_off; |
| } |
| |
| /* Hash function for a quick_file_names. */ |
| |
| static hashval_t |
| hash_file_name_entry (const void *e) |
| { |
| const struct quick_file_names *file_data |
| = (const struct quick_file_names *) e; |
| |
| return hash_stmt_list_entry (&file_data->hash); |
| } |
| |
| /* Equality function for a quick_file_names. */ |
| |
| static int |
| eq_file_name_entry (const void *a, const void *b) |
| { |
| const struct quick_file_names *ea = (const struct quick_file_names *) a; |
| const struct quick_file_names *eb = (const struct quick_file_names *) b; |
| |
| return eq_stmt_list_entry (&ea->hash, &eb->hash); |
| } |
| |
| /* Delete function for a quick_file_names. */ |
| |
| static void |
| delete_file_name_entry (void *e) |
| { |
| struct quick_file_names *file_data = (struct quick_file_names *) e; |
| int i; |
| |
| for (i = 0; i < file_data->num_file_names; ++i) |
| { |
| xfree ((void*) file_data->file_names[i]); |
| if (file_data->real_names) |
| xfree ((void*) file_data->real_names[i]); |
| } |
| |
| /* The space for the struct itself lives on objfile_obstack, |
| so we don't free it here. */ |
| } |
| |
| /* Create a quick_file_names hash table. */ |
| |
| static htab_t |
| create_quick_file_names_table (unsigned int nr_initial_entries) |
| { |
| return htab_create_alloc (nr_initial_entries, |
| hash_file_name_entry, eq_file_name_entry, |
| delete_file_name_entry, xcalloc, xfree); |
| } |
| |
| /* Read in PER_CU->CU. This function is unrelated to symtabs, symtab would |
| have to be created afterwards. You should call age_cached_comp_units after |
| processing PER_CU->CU. dw2_setup must have been already called. */ |
| |
| static void |
| load_cu (struct dwarf2_per_cu_data *per_cu) |
| { |
| if (per_cu->is_debug_types) |
| load_full_type_unit (per_cu); |
| else |
| load_full_comp_unit (per_cu, language_minimal); |
| |
| if (per_cu->cu == NULL) |
| return; /* Dummy CU. */ |
| |
| dwarf2_find_base_address (per_cu->cu->dies, per_cu->cu); |
| } |
| |
| /* Read in the symbols for PER_CU. */ |
| |
| static void |
| dw2_do_instantiate_symtab (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct cleanup *back_to; |
| |
| /* Skip type_unit_groups, reading the type units they contain |
| is handled elsewhere. */ |
| if (IS_TYPE_UNIT_GROUP (per_cu)) |
| return; |
| |
| back_to = make_cleanup (dwarf2_release_queue, NULL); |
| |
| if (dwarf2_per_objfile->using_index |
| ? per_cu->v.quick->compunit_symtab == NULL |
| : (per_cu->v.psymtab == NULL || !per_cu->v.psymtab->readin)) |
| { |
| queue_comp_unit (per_cu, language_minimal); |
| load_cu (per_cu); |
| |
| /* If we just loaded a CU from a DWO, and we're working with an index |
| that may badly handle TUs, load all the TUs in that DWO as well. |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */ |
| if (!per_cu->is_debug_types |
| && per_cu->cu != NULL |
| && per_cu->cu->dwo_unit != NULL |
| && dwarf2_per_objfile->index_table != NULL |
| && dwarf2_per_objfile->index_table->version <= 7 |
| /* DWP files aren't supported yet. */ |
| && get_dwp_file () == NULL) |
| queue_and_load_all_dwo_tus (per_cu); |
| } |
| |
| process_queue (); |
| |
| /* Age the cache, releasing compilation units that have not |
| been used recently. */ |
| age_cached_comp_units (); |
| |
| do_cleanups (back_to); |
| } |
| |
| /* Ensure that the symbols for PER_CU have been read in. OBJFILE is |
| the objfile from which this CU came. Returns the resulting symbol |
| table. */ |
| |
| static struct compunit_symtab * |
| dw2_instantiate_symtab (struct dwarf2_per_cu_data *per_cu) |
| { |
| gdb_assert (dwarf2_per_objfile->using_index); |
| if (!per_cu->v.quick->compunit_symtab) |
| { |
| struct cleanup *back_to = make_cleanup (free_cached_comp_units, NULL); |
| increment_reading_symtab (); |
| dw2_do_instantiate_symtab (per_cu); |
| process_cu_includes (); |
| do_cleanups (back_to); |
| } |
| |
| return per_cu->v.quick->compunit_symtab; |
| } |
| |
| /* Return the CU/TU given its index. |
| |
| This is intended for loops like: |
| |
| for (i = 0; i < (dwarf2_per_objfile->n_comp_units |
| + dwarf2_per_objfile->n_type_units); ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| |
| ...; |
| } |
| */ |
| |
| static struct dwarf2_per_cu_data * |
| dw2_get_cutu (int index) |
| { |
| if (index >= dwarf2_per_objfile->n_comp_units) |
| { |
| index -= dwarf2_per_objfile->n_comp_units; |
| gdb_assert (index < dwarf2_per_objfile->n_type_units); |
| return &dwarf2_per_objfile->all_type_units[index]->per_cu; |
| } |
| |
| return dwarf2_per_objfile->all_comp_units[index]; |
| } |
| |
| /* Return the CU given its index. |
| This differs from dw2_get_cutu in that it's for when you know INDEX |
| refers to a CU. */ |
| |
| static struct dwarf2_per_cu_data * |
| dw2_get_cu (int index) |
| { |
| gdb_assert (index >= 0 && index < dwarf2_per_objfile->n_comp_units); |
| |
| return dwarf2_per_objfile->all_comp_units[index]; |
| } |
| |
| /* A helper for create_cus_from_index that handles a given list of |
| CUs. */ |
| |
| static void |
| create_cus_from_index_list (struct objfile *objfile, |
| const gdb_byte *cu_list, offset_type n_elements, |
| struct dwarf2_section_info *section, |
| int is_dwz, |
| int base_offset) |
| { |
| offset_type i; |
| |
| for (i = 0; i < n_elements; i += 2) |
| { |
| struct dwarf2_per_cu_data *the_cu; |
| ULONGEST offset, length; |
| |
| gdb_static_assert (sizeof (ULONGEST) >= 8); |
| offset = extract_unsigned_integer (cu_list, 8, BFD_ENDIAN_LITTLE); |
| length = extract_unsigned_integer (cu_list + 8, 8, BFD_ENDIAN_LITTLE); |
| cu_list += 2 * 8; |
| |
| the_cu = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_data); |
| the_cu->offset.sect_off = offset; |
| the_cu->length = length; |
| the_cu->objfile = objfile; |
| the_cu->section = section; |
| the_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_quick_data); |
| the_cu->is_dwz = is_dwz; |
| dwarf2_per_objfile->all_comp_units[base_offset + i / 2] = the_cu; |
| } |
| } |
| |
| /* Read the CU list from the mapped index, and use it to create all |
| the CU objects for this objfile. */ |
| |
| static void |
| create_cus_from_index (struct objfile *objfile, |
| const gdb_byte *cu_list, offset_type cu_list_elements, |
| const gdb_byte *dwz_list, offset_type dwz_elements) |
| { |
| struct dwz_file *dwz; |
| |
| dwarf2_per_objfile->n_comp_units = (cu_list_elements + dwz_elements) / 2; |
| dwarf2_per_objfile->all_comp_units = |
| XOBNEWVEC (&objfile->objfile_obstack, struct dwarf2_per_cu_data *, |
| dwarf2_per_objfile->n_comp_units); |
| |
| create_cus_from_index_list (objfile, cu_list, cu_list_elements, |
| &dwarf2_per_objfile->info, 0, 0); |
| |
| if (dwz_elements == 0) |
| return; |
| |
| dwz = dwarf2_get_dwz_file (); |
| create_cus_from_index_list (objfile, dwz_list, dwz_elements, &dwz->info, 1, |
| cu_list_elements / 2); |
| } |
| |
| /* Create the signatured type hash table from the index. */ |
| |
| static void |
| create_signatured_type_table_from_index (struct objfile *objfile, |
| struct dwarf2_section_info *section, |
| const gdb_byte *bytes, |
| offset_type elements) |
| { |
| offset_type i; |
| htab_t sig_types_hash; |
| |
| dwarf2_per_objfile->n_type_units |
| = dwarf2_per_objfile->n_allocated_type_units |
| = elements / 3; |
| dwarf2_per_objfile->all_type_units = |
| XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units); |
| |
| sig_types_hash = allocate_signatured_type_table (objfile); |
| |
| for (i = 0; i < elements; i += 3) |
| { |
| struct signatured_type *sig_type; |
| ULONGEST offset, type_offset_in_tu, signature; |
| void **slot; |
| |
| gdb_static_assert (sizeof (ULONGEST) >= 8); |
| offset = extract_unsigned_integer (bytes, 8, BFD_ENDIAN_LITTLE); |
| type_offset_in_tu = extract_unsigned_integer (bytes + 8, 8, |
| BFD_ENDIAN_LITTLE); |
| signature = extract_unsigned_integer (bytes + 16, 8, BFD_ENDIAN_LITTLE); |
| bytes += 3 * 8; |
| |
| sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct signatured_type); |
| sig_type->signature = signature; |
| sig_type->type_offset_in_tu.cu_off = type_offset_in_tu; |
| sig_type->per_cu.is_debug_types = 1; |
| sig_type->per_cu.section = section; |
| sig_type->per_cu.offset.sect_off = offset; |
| sig_type->per_cu.objfile = objfile; |
| sig_type->per_cu.v.quick |
| = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_quick_data); |
| |
| slot = htab_find_slot (sig_types_hash, sig_type, INSERT); |
| *slot = sig_type; |
| |
| dwarf2_per_objfile->all_type_units[i / 3] = sig_type; |
| } |
| |
| dwarf2_per_objfile->signatured_types = sig_types_hash; |
| } |
| |
| /* Read the address map data from the mapped index, and use it to |
| populate the objfile's psymtabs_addrmap. */ |
| |
| static void |
| create_addrmap_from_index (struct objfile *objfile, struct mapped_index *index) |
| { |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| const gdb_byte *iter, *end; |
| struct obstack temp_obstack; |
| struct addrmap *mutable_map; |
| struct cleanup *cleanup; |
| CORE_ADDR baseaddr; |
| |
| obstack_init (&temp_obstack); |
| cleanup = make_cleanup_obstack_free (&temp_obstack); |
| mutable_map = addrmap_create_mutable (&temp_obstack); |
| |
| iter = index->address_table; |
| end = iter + index->address_table_size; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| while (iter < end) |
| { |
| ULONGEST hi, lo, cu_index; |
| lo = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); |
| iter += 8; |
| hi = extract_unsigned_integer (iter, 8, BFD_ENDIAN_LITTLE); |
| iter += 8; |
| cu_index = extract_unsigned_integer (iter, 4, BFD_ENDIAN_LITTLE); |
| iter += 4; |
| |
| if (lo > hi) |
| { |
| complaint (&symfile_complaints, |
| _(".gdb_index address table has invalid range (%s - %s)"), |
| hex_string (lo), hex_string (hi)); |
| continue; |
| } |
| |
| if (cu_index >= dwarf2_per_objfile->n_comp_units) |
| { |
| complaint (&symfile_complaints, |
| _(".gdb_index address table has invalid CU number %u"), |
| (unsigned) cu_index); |
| continue; |
| } |
| |
| lo = gdbarch_adjust_dwarf2_addr (gdbarch, lo + baseaddr); |
| hi = gdbarch_adjust_dwarf2_addr (gdbarch, hi + baseaddr); |
| addrmap_set_empty (mutable_map, lo, hi - 1, dw2_get_cutu (cu_index)); |
| } |
| |
| objfile->psymtabs_addrmap = addrmap_create_fixed (mutable_map, |
| &objfile->objfile_obstack); |
| do_cleanups (cleanup); |
| } |
| |
| /* The hash function for strings in the mapped index. This is the same as |
| SYMBOL_HASH_NEXT, but we keep a separate copy to maintain control over the |
| implementation. This is necessary because the hash function is tied to the |
| format of the mapped index file. The hash values do not have to match with |
| SYMBOL_HASH_NEXT. |
| |
| Use INT_MAX for INDEX_VERSION if you generate the current index format. */ |
| |
| static hashval_t |
| mapped_index_string_hash (int index_version, const void *p) |
| { |
| const unsigned char *str = (const unsigned char *) p; |
| hashval_t r = 0; |
| unsigned char c; |
| |
| while ((c = *str++) != 0) |
| { |
| if (index_version >= 5) |
| c = tolower (c); |
| r = r * 67 + c - 113; |
| } |
| |
| return r; |
| } |
| |
| /* Find a slot in the mapped index INDEX for the object named NAME. |
| If NAME is found, set *VEC_OUT to point to the CU vector in the |
| constant pool and return 1. If NAME cannot be found, return 0. */ |
| |
| static int |
| find_slot_in_mapped_hash (struct mapped_index *index, const char *name, |
| offset_type **vec_out) |
| { |
| struct cleanup *back_to = make_cleanup (null_cleanup, 0); |
| offset_type hash; |
| offset_type slot, step; |
| int (*cmp) (const char *, const char *); |
| |
| if (current_language->la_language == language_cplus |
| || current_language->la_language == language_fortran |
| || current_language->la_language == language_d) |
| { |
| /* NAME is already canonical. Drop any qualifiers as .gdb_index does |
| not contain any. */ |
| |
| if (strchr (name, '(') != NULL) |
| { |
| char *without_params = cp_remove_params (name); |
| |
| if (without_params != NULL) |
| { |
| make_cleanup (xfree, without_params); |
| name = without_params; |
| } |
| } |
| } |
| |
| /* Index version 4 did not support case insensitive searches. But the |
| indices for case insensitive languages are built in lowercase, therefore |
| simulate our NAME being searched is also lowercased. */ |
| hash = mapped_index_string_hash ((index->version == 4 |
| && case_sensitivity == case_sensitive_off |
| ? 5 : index->version), |
| name); |
| |
| slot = hash & (index->symbol_table_slots - 1); |
| step = ((hash * 17) & (index->symbol_table_slots - 1)) | 1; |
| cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp); |
| |
| for (;;) |
| { |
| /* Convert a slot number to an offset into the table. */ |
| offset_type i = 2 * slot; |
| const char *str; |
| if (index->symbol_table[i] == 0 && index->symbol_table[i + 1] == 0) |
| { |
| do_cleanups (back_to); |
| return 0; |
| } |
| |
| str = index->constant_pool + MAYBE_SWAP (index->symbol_table[i]); |
| if (!cmp (name, str)) |
| { |
| *vec_out = (offset_type *) (index->constant_pool |
| + MAYBE_SWAP (index->symbol_table[i + 1])); |
| do_cleanups (back_to); |
| return 1; |
| } |
| |
| slot = (slot + step) & (index->symbol_table_slots - 1); |
| } |
| } |
| |
| /* A helper function that reads the .gdb_index from SECTION and fills |
| in MAP. FILENAME is the name of the file containing the section; |
| it is used for error reporting. DEPRECATED_OK is nonzero if it is |
| ok to use deprecated sections. |
| |
| CU_LIST, CU_LIST_ELEMENTS, TYPES_LIST, and TYPES_LIST_ELEMENTS are |
| out parameters that are filled in with information about the CU and |
| TU lists in the section. |
| |
| Returns 1 if all went well, 0 otherwise. */ |
| |
| static int |
| read_index_from_section (struct objfile *objfile, |
| const char *filename, |
| int deprecated_ok, |
| struct dwarf2_section_info *section, |
| struct mapped_index *map, |
| const gdb_byte **cu_list, |
| offset_type *cu_list_elements, |
| const gdb_byte **types_list, |
| offset_type *types_list_elements) |
| { |
| const gdb_byte *addr; |
| offset_type version; |
| offset_type *metadata; |
| int i; |
| |
| if (dwarf2_section_empty_p (section)) |
| return 0; |
| |
| /* Older elfutils strip versions could keep the section in the main |
| executable while splitting it for the separate debug info file. */ |
| if ((get_section_flags (section) & SEC_HAS_CONTENTS) == 0) |
| return 0; |
| |
| dwarf2_read_section (objfile, section); |
| |
| addr = section->buffer; |
| /* Version check. */ |
| version = MAYBE_SWAP (*(offset_type *) addr); |
| /* Versions earlier than 3 emitted every copy of a psymbol. This |
| causes the index to behave very poorly for certain requests. Version 3 |
| contained incomplete addrmap. So, it seems better to just ignore such |
| indices. */ |
| if (version < 4) |
| { |
| static int warning_printed = 0; |
| if (!warning_printed) |
| { |
| warning (_("Skipping obsolete .gdb_index section in %s."), |
| filename); |
| warning_printed = 1; |
| } |
| return 0; |
| } |
| /* Index version 4 uses a different hash function than index version |
| 5 and later. |
| |
| Versions earlier than 6 did not emit psymbols for inlined |
| functions. Using these files will cause GDB not to be able to |
| set breakpoints on inlined functions by name, so we ignore these |
| indices unless the user has done |
| "set use-deprecated-index-sections on". */ |
| if (version < 6 && !deprecated_ok) |
| { |
| static int warning_printed = 0; |
| if (!warning_printed) |
| { |
| warning (_("\ |
| Skipping deprecated .gdb_index section in %s.\n\ |
| Do \"set use-deprecated-index-sections on\" before the file is read\n\ |
| to use the section anyway."), |
| filename); |
| warning_printed = 1; |
| } |
| return 0; |
| } |
| /* Version 7 indices generated by gold refer to the CU for a symbol instead |
| of the TU (for symbols coming from TUs), |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15021. |
| Plus gold-generated indices can have duplicate entries for global symbols, |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15646. |
| These are just performance bugs, and we can't distinguish gdb-generated |
| indices from gold-generated ones, so issue no warning here. */ |
| |
| /* Indexes with higher version than the one supported by GDB may be no |
| longer backward compatible. */ |
| if (version > 8) |
| return 0; |
| |
| map->version = version; |
| map->total_size = section->size; |
| |
| metadata = (offset_type *) (addr + sizeof (offset_type)); |
| |
| i = 0; |
| *cu_list = addr + MAYBE_SWAP (metadata[i]); |
| *cu_list_elements = ((MAYBE_SWAP (metadata[i + 1]) - MAYBE_SWAP (metadata[i])) |
| / 8); |
| ++i; |
| |
| *types_list = addr + MAYBE_SWAP (metadata[i]); |
| *types_list_elements = ((MAYBE_SWAP (metadata[i + 1]) |
| - MAYBE_SWAP (metadata[i])) |
| / 8); |
| ++i; |
| |
| map->address_table = addr + MAYBE_SWAP (metadata[i]); |
| map->address_table_size = (MAYBE_SWAP (metadata[i + 1]) |
| - MAYBE_SWAP (metadata[i])); |
| ++i; |
| |
| map->symbol_table = (offset_type *) (addr + MAYBE_SWAP (metadata[i])); |
| map->symbol_table_slots = ((MAYBE_SWAP (metadata[i + 1]) |
| - MAYBE_SWAP (metadata[i])) |
| / (2 * sizeof (offset_type))); |
| ++i; |
| |
| map->constant_pool = (char *) (addr + MAYBE_SWAP (metadata[i])); |
| |
| return 1; |
| } |
| |
| |
| /* Read the index file. If everything went ok, initialize the "quick" |
| elements of all the CUs and return 1. Otherwise, return 0. */ |
| |
| static int |
| dwarf2_read_index (struct objfile *objfile) |
| { |
| struct mapped_index local_map, *map; |
| const gdb_byte *cu_list, *types_list, *dwz_list = NULL; |
| offset_type cu_list_elements, types_list_elements, dwz_list_elements = 0; |
| struct dwz_file *dwz; |
| |
| if (!read_index_from_section (objfile, objfile_name (objfile), |
| use_deprecated_index_sections, |
| &dwarf2_per_objfile->gdb_index, &local_map, |
| &cu_list, &cu_list_elements, |
| &types_list, &types_list_elements)) |
| return 0; |
| |
| /* Don't use the index if it's empty. */ |
| if (local_map.symbol_table_slots == 0) |
| return 0; |
| |
| /* If there is a .dwz file, read it so we can get its CU list as |
| well. */ |
| dwz = dwarf2_get_dwz_file (); |
| if (dwz != NULL) |
| { |
| struct mapped_index dwz_map; |
| const gdb_byte *dwz_types_ignore; |
| offset_type dwz_types_elements_ignore; |
| |
| if (!read_index_from_section (objfile, bfd_get_filename (dwz->dwz_bfd), |
| 1, |
| &dwz->gdb_index, &dwz_map, |
| &dwz_list, &dwz_list_elements, |
| &dwz_types_ignore, |
| &dwz_types_elements_ignore)) |
| { |
| warning (_("could not read '.gdb_index' section from %s; skipping"), |
| bfd_get_filename (dwz->dwz_bfd)); |
| return 0; |
| } |
| } |
| |
| create_cus_from_index (objfile, cu_list, cu_list_elements, dwz_list, |
| dwz_list_elements); |
| |
| if (types_list_elements) |
| { |
| struct dwarf2_section_info *section; |
| |
| /* We can only handle a single .debug_types when we have an |
| index. */ |
| if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) != 1) |
| return 0; |
| |
| section = VEC_index (dwarf2_section_info_def, |
| dwarf2_per_objfile->types, 0); |
| |
| create_signatured_type_table_from_index (objfile, section, types_list, |
| types_list_elements); |
| } |
| |
| create_addrmap_from_index (objfile, &local_map); |
| |
| map = XOBNEW (&objfile->objfile_obstack, struct mapped_index); |
| *map = local_map; |
| |
| dwarf2_per_objfile->index_table = map; |
| dwarf2_per_objfile->using_index = 1; |
| dwarf2_per_objfile->quick_file_names_table = |
| create_quick_file_names_table (dwarf2_per_objfile->n_comp_units); |
| |
| return 1; |
| } |
| |
| /* A helper for the "quick" functions which sets the global |
| dwarf2_per_objfile according to OBJFILE. */ |
| |
| static void |
| dw2_setup (struct objfile *objfile) |
| { |
| dwarf2_per_objfile = ((struct dwarf2_per_objfile *) |
| objfile_data (objfile, dwarf2_objfile_data_key)); |
| gdb_assert (dwarf2_per_objfile); |
| } |
| |
| /* die_reader_func for dw2_get_file_names. */ |
| |
| static void |
| dw2_get_file_names_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct dwarf2_per_cu_data *this_cu = cu->per_cu; |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_per_cu_data *lh_cu; |
| struct line_header *lh; |
| struct attribute *attr; |
| int i; |
| const char *name, *comp_dir; |
| void **slot; |
| struct quick_file_names *qfn; |
| unsigned int line_offset; |
| |
| gdb_assert (! this_cu->is_debug_types); |
| |
| /* Our callers never want to match partial units -- instead they |
| will match the enclosing full CU. */ |
| if (comp_unit_die->tag == DW_TAG_partial_unit) |
| { |
| this_cu->v.quick->no_file_data = 1; |
| return; |
| } |
| |
| lh_cu = this_cu; |
| lh = NULL; |
| slot = NULL; |
| line_offset = 0; |
| |
| attr = dwarf2_attr (comp_unit_die, DW_AT_stmt_list, cu); |
| if (attr) |
| { |
| struct quick_file_names find_entry; |
| |
| line_offset = DW_UNSND (attr); |
| |
| /* We may have already read in this line header (TU line header sharing). |
| If we have we're done. */ |
| find_entry.hash.dwo_unit = cu->dwo_unit; |
| find_entry.hash.line_offset.sect_off = line_offset; |
| slot = htab_find_slot (dwarf2_per_objfile->quick_file_names_table, |
| &find_entry, INSERT); |
| if (*slot != NULL) |
| { |
| lh_cu->v.quick->file_names = (struct quick_file_names *) *slot; |
| return; |
| } |
| |
| lh = dwarf_decode_line_header (line_offset, cu); |
| } |
| if (lh == NULL) |
| { |
| lh_cu->v.quick->no_file_data = 1; |
| return; |
| } |
| |
| qfn = XOBNEW (&objfile->objfile_obstack, struct quick_file_names); |
| qfn->hash.dwo_unit = cu->dwo_unit; |
| qfn->hash.line_offset.sect_off = line_offset; |
| gdb_assert (slot != NULL); |
| *slot = qfn; |
| |
| find_file_and_directory (comp_unit_die, cu, &name, &comp_dir); |
| |
| qfn->num_file_names = lh->num_file_names; |
| qfn->file_names = |
| XOBNEWVEC (&objfile->objfile_obstack, const char *, lh->num_file_names); |
| for (i = 0; i < lh->num_file_names; ++i) |
| qfn->file_names[i] = file_full_name (i + 1, lh, comp_dir); |
| qfn->real_names = NULL; |
| |
| free_line_header (lh); |
| |
| lh_cu->v.quick->file_names = qfn; |
| } |
| |
| /* A helper for the "quick" functions which attempts to read the line |
| table for THIS_CU. */ |
| |
| static struct quick_file_names * |
| dw2_get_file_names (struct dwarf2_per_cu_data *this_cu) |
| { |
| /* This should never be called for TUs. */ |
| gdb_assert (! this_cu->is_debug_types); |
| /* Nor type unit groups. */ |
| gdb_assert (! IS_TYPE_UNIT_GROUP (this_cu)); |
| |
| if (this_cu->v.quick->file_names != NULL) |
| return this_cu->v.quick->file_names; |
| /* If we know there is no line data, no point in looking again. */ |
| if (this_cu->v.quick->no_file_data) |
| return NULL; |
| |
| init_cutu_and_read_dies_simple (this_cu, dw2_get_file_names_reader, NULL); |
| |
| if (this_cu->v.quick->no_file_data) |
| return NULL; |
| return this_cu->v.quick->file_names; |
| } |
| |
| /* A helper for the "quick" functions which computes and caches the |
| real path for a given file name from the line table. */ |
| |
| static const char * |
| dw2_get_real_path (struct objfile *objfile, |
| struct quick_file_names *qfn, int index) |
| { |
| if (qfn->real_names == NULL) |
| qfn->real_names = OBSTACK_CALLOC (&objfile->objfile_obstack, |
| qfn->num_file_names, const char *); |
| |
| if (qfn->real_names[index] == NULL) |
| qfn->real_names[index] = gdb_realpath (qfn->file_names[index]); |
| |
| return qfn->real_names[index]; |
| } |
| |
| static struct symtab * |
| dw2_find_last_source_symtab (struct objfile *objfile) |
| { |
| struct compunit_symtab *cust; |
| int index; |
| |
| dw2_setup (objfile); |
| index = dwarf2_per_objfile->n_comp_units - 1; |
| cust = dw2_instantiate_symtab (dw2_get_cutu (index)); |
| if (cust == NULL) |
| return NULL; |
| return compunit_primary_filetab (cust); |
| } |
| |
| /* Traversal function for dw2_forget_cached_source_info. */ |
| |
| static int |
| dw2_free_cached_file_names (void **slot, void *info) |
| { |
| struct quick_file_names *file_data = (struct quick_file_names *) *slot; |
| |
| if (file_data->real_names) |
| { |
| int i; |
| |
| for (i = 0; i < file_data->num_file_names; ++i) |
| { |
| xfree ((void*) file_data->real_names[i]); |
| file_data->real_names[i] = NULL; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static void |
| dw2_forget_cached_source_info (struct objfile *objfile) |
| { |
| dw2_setup (objfile); |
| |
| htab_traverse_noresize (dwarf2_per_objfile->quick_file_names_table, |
| dw2_free_cached_file_names, NULL); |
| } |
| |
| /* Helper function for dw2_map_symtabs_matching_filename that expands |
| the symtabs and calls the iterator. */ |
| |
| static int |
| dw2_map_expand_apply (struct objfile *objfile, |
| struct dwarf2_per_cu_data *per_cu, |
| const char *name, const char *real_path, |
| int (*callback) (struct symtab *, void *), |
| void *data) |
| { |
| struct compunit_symtab *last_made = objfile->compunit_symtabs; |
| |
| /* Don't visit already-expanded CUs. */ |
| if (per_cu->v.quick->compunit_symtab) |
| return 0; |
| |
| /* This may expand more than one symtab, and we want to iterate over |
| all of them. */ |
| dw2_instantiate_symtab (per_cu); |
| |
| return iterate_over_some_symtabs (name, real_path, callback, data, |
| objfile->compunit_symtabs, last_made); |
| } |
| |
| /* Implementation of the map_symtabs_matching_filename method. */ |
| |
| static int |
| dw2_map_symtabs_matching_filename (struct objfile *objfile, const char *name, |
| const char *real_path, |
| int (*callback) (struct symtab *, void *), |
| void *data) |
| { |
| int i; |
| const char *name_basename = lbasename (name); |
| |
| dw2_setup (objfile); |
| |
| /* The rule is CUs specify all the files, including those used by |
| any TU, so there's no need to scan TUs here. */ |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| int j; |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); |
| struct quick_file_names *file_data; |
| |
| /* We only need to look at symtabs not already expanded. */ |
| if (per_cu->v.quick->compunit_symtab) |
| continue; |
| |
| file_data = dw2_get_file_names (per_cu); |
| if (file_data == NULL) |
| continue; |
| |
| for (j = 0; j < file_data->num_file_names; ++j) |
| { |
| const char *this_name = file_data->file_names[j]; |
| const char *this_real_name; |
| |
| if (compare_filenames_for_search (this_name, name)) |
| { |
| if (dw2_map_expand_apply (objfile, per_cu, name, real_path, |
| callback, data)) |
| return 1; |
| continue; |
| } |
| |
| /* Before we invoke realpath, which can get expensive when many |
| files are involved, do a quick comparison of the basenames. */ |
| if (! basenames_may_differ |
| && FILENAME_CMP (lbasename (this_name), name_basename) != 0) |
| continue; |
| |
| this_real_name = dw2_get_real_path (objfile, file_data, j); |
| if (compare_filenames_for_search (this_real_name, name)) |
| { |
| if (dw2_map_expand_apply (objfile, per_cu, name, real_path, |
| callback, data)) |
| return 1; |
| continue; |
| } |
| |
| if (real_path != NULL) |
| { |
| gdb_assert (IS_ABSOLUTE_PATH (real_path)); |
| gdb_assert (IS_ABSOLUTE_PATH (name)); |
| if (this_real_name != NULL |
| && FILENAME_CMP (real_path, this_real_name) == 0) |
| { |
| if (dw2_map_expand_apply (objfile, per_cu, name, real_path, |
| callback, data)) |
| return 1; |
| continue; |
| } |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Struct used to manage iterating over all CUs looking for a symbol. */ |
| |
| struct dw2_symtab_iterator |
| { |
| /* The internalized form of .gdb_index. */ |
| struct mapped_index *index; |
| /* If non-zero, only look for symbols that match BLOCK_INDEX. */ |
| int want_specific_block; |
| /* One of GLOBAL_BLOCK or STATIC_BLOCK. |
| Unused if !WANT_SPECIFIC_BLOCK. */ |
| int block_index; |
| /* The kind of symbol we're looking for. */ |
| domain_enum domain; |
| /* The list of CUs from the index entry of the symbol, |
| or NULL if not found. */ |
| offset_type *vec; |
| /* The next element in VEC to look at. */ |
| int next; |
| /* The number of elements in VEC, or zero if there is no match. */ |
| int length; |
| /* Have we seen a global version of the symbol? |
| If so we can ignore all further global instances. |
| This is to work around gold/15646, inefficient gold-generated |
| indices. */ |
| int global_seen; |
| }; |
| |
| /* Initialize the index symtab iterator ITER. |
| If WANT_SPECIFIC_BLOCK is non-zero, only look for symbols |
| in block BLOCK_INDEX. Otherwise BLOCK_INDEX is ignored. */ |
| |
| static void |
| dw2_symtab_iter_init (struct dw2_symtab_iterator *iter, |
| struct mapped_index *index, |
| int want_specific_block, |
| int block_index, |
| domain_enum domain, |
| const char *name) |
| { |
| iter->index = index; |
| iter->want_specific_block = want_specific_block; |
| iter->block_index = block_index; |
| iter->domain = domain; |
| iter->next = 0; |
| iter->global_seen = 0; |
| |
| if (find_slot_in_mapped_hash (index, name, &iter->vec)) |
| iter->length = MAYBE_SWAP (*iter->vec); |
| else |
| { |
| iter->vec = NULL; |
| iter->length = 0; |
| } |
| } |
| |
| /* Return the next matching CU or NULL if there are no more. */ |
| |
| static struct dwarf2_per_cu_data * |
| dw2_symtab_iter_next (struct dw2_symtab_iterator *iter) |
| { |
| for ( ; iter->next < iter->length; ++iter->next) |
| { |
| offset_type cu_index_and_attrs = |
| MAYBE_SWAP (iter->vec[iter->next + 1]); |
| offset_type cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); |
| struct dwarf2_per_cu_data *per_cu; |
| int want_static = iter->block_index != GLOBAL_BLOCK; |
| /* This value is only valid for index versions >= 7. */ |
| int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); |
| gdb_index_symbol_kind symbol_kind = |
| GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); |
| /* Only check the symbol attributes if they're present. |
| Indices prior to version 7 don't record them, |
| and indices >= 7 may elide them for certain symbols |
| (gold does this). */ |
| int attrs_valid = |
| (iter->index->version >= 7 |
| && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); |
| |
| /* Don't crash on bad data. */ |
| if (cu_index >= (dwarf2_per_objfile->n_comp_units |
| + dwarf2_per_objfile->n_type_units)) |
| { |
| complaint (&symfile_complaints, |
| _(".gdb_index entry has bad CU index" |
| " [in module %s]"), |
| objfile_name (dwarf2_per_objfile->objfile)); |
| continue; |
| } |
| |
| per_cu = dw2_get_cutu (cu_index); |
| |
| /* Skip if already read in. */ |
| if (per_cu->v.quick->compunit_symtab) |
| continue; |
| |
| /* Check static vs global. */ |
| if (attrs_valid) |
| { |
| if (iter->want_specific_block |
| && want_static != is_static) |
| continue; |
| /* Work around gold/15646. */ |
| if (!is_static && iter->global_seen) |
| continue; |
| if (!is_static) |
| iter->global_seen = 1; |
| } |
| |
| /* Only check the symbol's kind if it has one. */ |
| if (attrs_valid) |
| { |
| switch (iter->domain) |
| { |
| case VAR_DOMAIN: |
| if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE |
| && symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION |
| /* Some types are also in VAR_DOMAIN. */ |
| && symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) |
| continue; |
| break; |
| case STRUCT_DOMAIN: |
| if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) |
| continue; |
| break; |
| case LABEL_DOMAIN: |
| if (symbol_kind != GDB_INDEX_SYMBOL_KIND_OTHER) |
| continue; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| ++iter->next; |
| return per_cu; |
| } |
| |
| return NULL; |
| } |
| |
| static struct compunit_symtab * |
| dw2_lookup_symbol (struct objfile *objfile, int block_index, |
| const char *name, domain_enum domain) |
| { |
| struct compunit_symtab *stab_best = NULL; |
| struct mapped_index *index; |
| |
| dw2_setup (objfile); |
| |
| index = dwarf2_per_objfile->index_table; |
| |
| /* index is NULL if OBJF_READNOW. */ |
| if (index) |
| { |
| struct dw2_symtab_iterator iter; |
| struct dwarf2_per_cu_data *per_cu; |
| |
| dw2_symtab_iter_init (&iter, index, 1, block_index, domain, name); |
| |
| while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) |
| { |
| struct symbol *sym, *with_opaque = NULL; |
| struct compunit_symtab *stab = dw2_instantiate_symtab (per_cu); |
| const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab); |
| struct block *block = BLOCKVECTOR_BLOCK (bv, block_index); |
| |
| sym = block_find_symbol (block, name, domain, |
| block_find_non_opaque_type_preferred, |
| &with_opaque); |
| |
| /* Some caution must be observed with overloaded functions |
| and methods, since the index will not contain any overload |
| information (but NAME might contain it). */ |
| |
| if (sym != NULL |
| && strcmp_iw (SYMBOL_SEARCH_NAME (sym), name) == 0) |
| return stab; |
| if (with_opaque != NULL |
| && strcmp_iw (SYMBOL_SEARCH_NAME (with_opaque), name) == 0) |
| stab_best = stab; |
| |
| /* Keep looking through other CUs. */ |
| } |
| } |
| |
| return stab_best; |
| } |
| |
| static void |
| dw2_print_stats (struct objfile *objfile) |
| { |
| int i, total, count; |
| |
| dw2_setup (objfile); |
| total = dwarf2_per_objfile->n_comp_units + dwarf2_per_objfile->n_type_units; |
| count = 0; |
| for (i = 0; i < total; ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| |
| if (!per_cu->v.quick->compunit_symtab) |
| ++count; |
| } |
| printf_filtered (_(" Number of read CUs: %d\n"), total - count); |
| printf_filtered (_(" Number of unread CUs: %d\n"), count); |
| } |
| |
| /* This dumps minimal information about the index. |
| It is called via "mt print objfiles". |
| One use is to verify .gdb_index has been loaded by the |
| gdb.dwarf2/gdb-index.exp testcase. */ |
| |
| static void |
| dw2_dump (struct objfile *objfile) |
| { |
| dw2_setup (objfile); |
| gdb_assert (dwarf2_per_objfile->using_index); |
| printf_filtered (".gdb_index:"); |
| if (dwarf2_per_objfile->index_table != NULL) |
| { |
| printf_filtered (" version %d\n", |
| dwarf2_per_objfile->index_table->version); |
| } |
| else |
| printf_filtered (" faked for \"readnow\"\n"); |
| printf_filtered ("\n"); |
| } |
| |
| static void |
| dw2_relocate (struct objfile *objfile, |
| const struct section_offsets *new_offsets, |
| const struct section_offsets *delta) |
| { |
| /* There's nothing to relocate here. */ |
| } |
| |
| static void |
| dw2_expand_symtabs_for_function (struct objfile *objfile, |
| const char *func_name) |
| { |
| struct mapped_index *index; |
| |
| dw2_setup (objfile); |
| |
| index = dwarf2_per_objfile->index_table; |
| |
| /* index is NULL if OBJF_READNOW. */ |
| if (index) |
| { |
| struct dw2_symtab_iterator iter; |
| struct dwarf2_per_cu_data *per_cu; |
| |
| /* Note: It doesn't matter what we pass for block_index here. */ |
| dw2_symtab_iter_init (&iter, index, 0, GLOBAL_BLOCK, VAR_DOMAIN, |
| func_name); |
| |
| while ((per_cu = dw2_symtab_iter_next (&iter)) != NULL) |
| dw2_instantiate_symtab (per_cu); |
| } |
| } |
| |
| static void |
| dw2_expand_all_symtabs (struct objfile *objfile) |
| { |
| int i; |
| |
| dw2_setup (objfile); |
| |
| for (i = 0; i < (dwarf2_per_objfile->n_comp_units |
| + dwarf2_per_objfile->n_type_units); ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| |
| dw2_instantiate_symtab (per_cu); |
| } |
| } |
| |
| static void |
| dw2_expand_symtabs_with_fullname (struct objfile *objfile, |
| const char *fullname) |
| { |
| int i; |
| |
| dw2_setup (objfile); |
| |
| /* We don't need to consider type units here. |
| This is only called for examining code, e.g. expand_line_sal. |
| There can be an order of magnitude (or more) more type units |
| than comp units, and we avoid them if we can. */ |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| int j; |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| struct quick_file_names *file_data; |
| |
| /* We only need to look at symtabs not already expanded. */ |
| if (per_cu->v.quick->compunit_symtab) |
| continue; |
| |
| file_data = dw2_get_file_names (per_cu); |
| if (file_data == NULL) |
| continue; |
| |
| for (j = 0; j < file_data->num_file_names; ++j) |
| { |
| const char *this_fullname = file_data->file_names[j]; |
| |
| if (filename_cmp (this_fullname, fullname) == 0) |
| { |
| dw2_instantiate_symtab (per_cu); |
| break; |
| } |
| } |
| } |
| } |
| |
| static void |
| dw2_map_matching_symbols (struct objfile *objfile, |
| const char * name, domain_enum domain, |
| int global, |
| int (*callback) (struct block *, |
| struct symbol *, void *), |
| void *data, symbol_compare_ftype *match, |
| symbol_compare_ftype *ordered_compare) |
| { |
| /* Currently unimplemented; used for Ada. The function can be called if the |
| current language is Ada for a non-Ada objfile using GNU index. As Ada |
| does not look for non-Ada symbols this function should just return. */ |
| } |
| |
| static void |
| dw2_expand_symtabs_matching |
| (struct objfile *objfile, |
| expand_symtabs_file_matcher_ftype *file_matcher, |
| expand_symtabs_symbol_matcher_ftype *symbol_matcher, |
| expand_symtabs_exp_notify_ftype *expansion_notify, |
| enum search_domain kind, |
| void *data) |
| { |
| int i; |
| offset_type iter; |
| struct mapped_index *index; |
| |
| dw2_setup (objfile); |
| |
| /* index_table is NULL if OBJF_READNOW. */ |
| if (!dwarf2_per_objfile->index_table) |
| return; |
| index = dwarf2_per_objfile->index_table; |
| |
| if (file_matcher != NULL) |
| { |
| struct cleanup *cleanup; |
| htab_t visited_found, visited_not_found; |
| |
| visited_found = htab_create_alloc (10, |
| htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| cleanup = make_cleanup_htab_delete (visited_found); |
| visited_not_found = htab_create_alloc (10, |
| htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| make_cleanup_htab_delete (visited_not_found); |
| |
| /* The rule is CUs specify all the files, including those used by |
| any TU, so there's no need to scan TUs here. */ |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| int j; |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); |
| struct quick_file_names *file_data; |
| void **slot; |
| |
| QUIT; |
| |
| per_cu->v.quick->mark = 0; |
| |
| /* We only need to look at symtabs not already expanded. */ |
| if (per_cu->v.quick->compunit_symtab) |
| continue; |
| |
| file_data = dw2_get_file_names (per_cu); |
| if (file_data == NULL) |
| continue; |
| |
| if (htab_find (visited_not_found, file_data) != NULL) |
| continue; |
| else if (htab_find (visited_found, file_data) != NULL) |
| { |
| per_cu->v.quick->mark = 1; |
| continue; |
| } |
| |
| for (j = 0; j < file_data->num_file_names; ++j) |
| { |
| const char *this_real_name; |
| |
| if (file_matcher (file_data->file_names[j], data, 0)) |
| { |
| per_cu->v.quick->mark = 1; |
| break; |
| } |
| |
| /* Before we invoke realpath, which can get expensive when many |
| files are involved, do a quick comparison of the basenames. */ |
| if (!basenames_may_differ |
| && !file_matcher (lbasename (file_data->file_names[j]), |
| data, 1)) |
| continue; |
| |
| this_real_name = dw2_get_real_path (objfile, file_data, j); |
| if (file_matcher (this_real_name, data, 0)) |
| { |
| per_cu->v.quick->mark = 1; |
| break; |
| } |
| } |
| |
| slot = htab_find_slot (per_cu->v.quick->mark |
| ? visited_found |
| : visited_not_found, |
| file_data, INSERT); |
| *slot = file_data; |
| } |
| |
| do_cleanups (cleanup); |
| } |
| |
| for (iter = 0; iter < index->symbol_table_slots; ++iter) |
| { |
| offset_type idx = 2 * iter; |
| const char *name; |
| offset_type *vec, vec_len, vec_idx; |
| int global_seen = 0; |
| |
| QUIT; |
| |
| if (index->symbol_table[idx] == 0 && index->symbol_table[idx + 1] == 0) |
| continue; |
| |
| name = index->constant_pool + MAYBE_SWAP (index->symbol_table[idx]); |
| |
| if (! (*symbol_matcher) (name, data)) |
| continue; |
| |
| /* The name was matched, now expand corresponding CUs that were |
| marked. */ |
| vec = (offset_type *) (index->constant_pool |
| + MAYBE_SWAP (index->symbol_table[idx + 1])); |
| vec_len = MAYBE_SWAP (vec[0]); |
| for (vec_idx = 0; vec_idx < vec_len; ++vec_idx) |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| offset_type cu_index_and_attrs = MAYBE_SWAP (vec[vec_idx + 1]); |
| /* This value is only valid for index versions >= 7. */ |
| int is_static = GDB_INDEX_SYMBOL_STATIC_VALUE (cu_index_and_attrs); |
| gdb_index_symbol_kind symbol_kind = |
| GDB_INDEX_SYMBOL_KIND_VALUE (cu_index_and_attrs); |
| int cu_index = GDB_INDEX_CU_VALUE (cu_index_and_attrs); |
| /* Only check the symbol attributes if they're present. |
| Indices prior to version 7 don't record them, |
| and indices >= 7 may elide them for certain symbols |
| (gold does this). */ |
| int attrs_valid = |
| (index->version >= 7 |
| && symbol_kind != GDB_INDEX_SYMBOL_KIND_NONE); |
| |
| /* Work around gold/15646. */ |
| if (attrs_valid) |
| { |
| if (!is_static && global_seen) |
| continue; |
| if (!is_static) |
| global_seen = 1; |
| } |
| |
| /* Only check the symbol's kind if it has one. */ |
| if (attrs_valid) |
| { |
| switch (kind) |
| { |
| case VARIABLES_DOMAIN: |
| if (symbol_kind != GDB_INDEX_SYMBOL_KIND_VARIABLE) |
| continue; |
| break; |
| case FUNCTIONS_DOMAIN: |
| if (symbol_kind != GDB_INDEX_SYMBOL_KIND_FUNCTION) |
| continue; |
| break; |
| case TYPES_DOMAIN: |
| if (symbol_kind != GDB_INDEX_SYMBOL_KIND_TYPE) |
| continue; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /* Don't crash on bad data. */ |
| if (cu_index >= (dwarf2_per_objfile->n_comp_units |
| + dwarf2_per_objfile->n_type_units)) |
| { |
| complaint (&symfile_complaints, |
| _(".gdb_index entry has bad CU index" |
| " [in module %s]"), objfile_name (objfile)); |
| continue; |
| } |
| |
| per_cu = dw2_get_cutu (cu_index); |
| if (file_matcher == NULL || per_cu->v.quick->mark) |
| { |
| int symtab_was_null = |
| (per_cu->v.quick->compunit_symtab == NULL); |
| |
| dw2_instantiate_symtab (per_cu); |
| |
| if (expansion_notify != NULL |
| && symtab_was_null |
| && per_cu->v.quick->compunit_symtab != NULL) |
| { |
| expansion_notify (per_cu->v.quick->compunit_symtab, |
| data); |
| } |
| } |
| } |
| } |
| } |
| |
| /* A helper for dw2_find_pc_sect_compunit_symtab which finds the most specific |
| symtab. */ |
| |
| static struct compunit_symtab * |
| recursively_find_pc_sect_compunit_symtab (struct compunit_symtab *cust, |
| CORE_ADDR pc) |
| { |
| int i; |
| |
| if (COMPUNIT_BLOCKVECTOR (cust) != NULL |
| && blockvector_contains_pc (COMPUNIT_BLOCKVECTOR (cust), pc)) |
| return cust; |
| |
| if (cust->includes == NULL) |
| return NULL; |
| |
| for (i = 0; cust->includes[i]; ++i) |
| { |
| struct compunit_symtab *s = cust->includes[i]; |
| |
| s = recursively_find_pc_sect_compunit_symtab (s, pc); |
| if (s != NULL) |
| return s; |
| } |
| |
| return NULL; |
| } |
| |
| static struct compunit_symtab * |
| dw2_find_pc_sect_compunit_symtab (struct objfile *objfile, |
| struct bound_minimal_symbol msymbol, |
| CORE_ADDR pc, |
| struct obj_section *section, |
| int warn_if_readin) |
| { |
| struct dwarf2_per_cu_data *data; |
| struct compunit_symtab *result; |
| |
| dw2_setup (objfile); |
| |
| if (!objfile->psymtabs_addrmap) |
| return NULL; |
| |
| data = (struct dwarf2_per_cu_data *) addrmap_find (objfile->psymtabs_addrmap, |
| pc); |
| if (!data) |
| return NULL; |
| |
| if (warn_if_readin && data->v.quick->compunit_symtab) |
| warning (_("(Internal error: pc %s in read in CU, but not in symtab.)"), |
| paddress (get_objfile_arch (objfile), pc)); |
| |
| result |
| = recursively_find_pc_sect_compunit_symtab (dw2_instantiate_symtab (data), |
| pc); |
| gdb_assert (result != NULL); |
| return result; |
| } |
| |
| static void |
| dw2_map_symbol_filenames (struct objfile *objfile, symbol_filename_ftype *fun, |
| void *data, int need_fullname) |
| { |
| int i; |
| struct cleanup *cleanup; |
| htab_t visited = htab_create_alloc (10, htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| |
| cleanup = make_cleanup_htab_delete (visited); |
| dw2_setup (objfile); |
| |
| /* The rule is CUs specify all the files, including those used by |
| any TU, so there's no need to scan TUs here. |
| We can ignore file names coming from already-expanded CUs. */ |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| |
| if (per_cu->v.quick->compunit_symtab) |
| { |
| void **slot = htab_find_slot (visited, per_cu->v.quick->file_names, |
| INSERT); |
| |
| *slot = per_cu->v.quick->file_names; |
| } |
| } |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| int j; |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cu (i); |
| struct quick_file_names *file_data; |
| void **slot; |
| |
| /* We only need to look at symtabs not already expanded. */ |
| if (per_cu->v.quick->compunit_symtab) |
| continue; |
| |
| file_data = dw2_get_file_names (per_cu); |
| if (file_data == NULL) |
| continue; |
| |
| slot = htab_find_slot (visited, file_data, INSERT); |
| if (*slot) |
| { |
| /* Already visited. */ |
| continue; |
| } |
| *slot = file_data; |
| |
| for (j = 0; j < file_data->num_file_names; ++j) |
| { |
| const char *this_real_name; |
| |
| if (need_fullname) |
| this_real_name = dw2_get_real_path (objfile, file_data, j); |
| else |
| this_real_name = NULL; |
| (*fun) (file_data->file_names[j], this_real_name, data); |
| } |
| } |
| |
| do_cleanups (cleanup); |
| } |
| |
| static int |
| dw2_has_symbols (struct objfile *objfile) |
| { |
| return 1; |
| } |
| |
| const struct quick_symbol_functions dwarf2_gdb_index_functions = |
| { |
| dw2_has_symbols, |
| dw2_find_last_source_symtab, |
| dw2_forget_cached_source_info, |
| dw2_map_symtabs_matching_filename, |
| dw2_lookup_symbol, |
| dw2_print_stats, |
| dw2_dump, |
| dw2_relocate, |
| dw2_expand_symtabs_for_function, |
| dw2_expand_all_symtabs, |
| dw2_expand_symtabs_with_fullname, |
| dw2_map_matching_symbols, |
| dw2_expand_symtabs_matching, |
| dw2_find_pc_sect_compunit_symtab, |
| dw2_map_symbol_filenames |
| }; |
| |
| /* Initialize for reading DWARF for this objfile. Return 0 if this |
| file will use psymtabs, or 1 if using the GNU index. */ |
| |
| int |
| dwarf2_initialize_objfile (struct objfile *objfile) |
| { |
| /* If we're about to read full symbols, don't bother with the |
| indices. In this case we also don't care if some other debug |
| format is making psymtabs, because they are all about to be |
| expanded anyway. */ |
| if ((objfile->flags & OBJF_READNOW)) |
| { |
| int i; |
| |
| dwarf2_per_objfile->using_index = 1; |
| create_all_comp_units (objfile); |
| create_all_type_units (objfile); |
| dwarf2_per_objfile->quick_file_names_table = |
| create_quick_file_names_table (dwarf2_per_objfile->n_comp_units); |
| |
| for (i = 0; i < (dwarf2_per_objfile->n_comp_units |
| + dwarf2_per_objfile->n_type_units); ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| |
| per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_quick_data); |
| } |
| |
| /* Return 1 so that gdb sees the "quick" functions. However, |
| these functions will be no-ops because we will have expanded |
| all symtabs. */ |
| return 1; |
| } |
| |
| if (dwarf2_read_index (objfile)) |
| return 1; |
| |
| return 0; |
| } |
| |
| |
| |
| /* Build a partial symbol table. */ |
| |
| void |
| dwarf2_build_psymtabs (struct objfile *objfile) |
| { |
| |
| if (objfile->global_psymbols.size == 0 && objfile->static_psymbols.size == 0) |
| { |
| init_psymbol_list (objfile, 1024); |
| } |
| |
| TRY |
| { |
| /* This isn't really ideal: all the data we allocate on the |
| objfile's obstack is still uselessly kept around. However, |
| freeing it seems unsafe. */ |
| struct cleanup *cleanups = make_cleanup_discard_psymtabs (objfile); |
| |
| dwarf2_build_psymtabs_hard (objfile); |
| discard_cleanups (cleanups); |
| } |
| CATCH (except, RETURN_MASK_ERROR) |
| { |
| exception_print (gdb_stderr, except); |
| } |
| END_CATCH |
| } |
| |
| /* Return the total length of the CU described by HEADER. */ |
| |
| static unsigned int |
| get_cu_length (const struct comp_unit_head *header) |
| { |
| return header->initial_length_size + header->length; |
| } |
| |
| /* Return TRUE if OFFSET is within CU_HEADER. */ |
| |
| static inline int |
| offset_in_cu_p (const struct comp_unit_head *cu_header, sect_offset offset) |
| { |
| sect_offset bottom = { cu_header->offset.sect_off }; |
| sect_offset top = { cu_header->offset.sect_off + get_cu_length (cu_header) }; |
| |
| return (offset.sect_off >= bottom.sect_off && offset.sect_off < top.sect_off); |
| } |
| |
| /* Find the base address of the compilation unit for range lists and |
| location lists. It will normally be specified by DW_AT_low_pc. |
| In DWARF-3 draft 4, the base address could be overridden by |
| DW_AT_entry_pc. It's been removed, but GCC still uses this for |
| compilation units with discontinuous ranges. */ |
| |
| static void |
| dwarf2_find_base_address (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| cu->base_known = 0; |
| cu->base_address = 0; |
| |
| attr = dwarf2_attr (die, DW_AT_entry_pc, cu); |
| if (attr) |
| { |
| cu->base_address = attr_value_as_address (attr); |
| cu->base_known = 1; |
| } |
| else |
| { |
| attr = dwarf2_attr (die, DW_AT_low_pc, cu); |
| if (attr) |
| { |
| cu->base_address = attr_value_as_address (attr); |
| cu->base_known = 1; |
| } |
| } |
| } |
| |
| /* Read in the comp unit header information from the debug_info at info_ptr. |
| NOTE: This leaves members offset, first_die_offset to be filled in |
| by the caller. */ |
| |
| static const gdb_byte * |
| read_comp_unit_head (struct comp_unit_head *cu_header, |
| const gdb_byte *info_ptr, bfd *abfd) |
| { |
| int signed_addr; |
| unsigned int bytes_read; |
| |
| cu_header->length = read_initial_length (abfd, info_ptr, &bytes_read); |
| cu_header->initial_length_size = bytes_read; |
| cu_header->offset_size = (bytes_read == 4) ? 4 : 8; |
| info_ptr += bytes_read; |
| cu_header->version = read_2_bytes (abfd, info_ptr); |
| info_ptr += 2; |
| cu_header->abbrev_offset.sect_off = read_offset (abfd, info_ptr, cu_header, |
| &bytes_read); |
| info_ptr += bytes_read; |
| cu_header->addr_size = read_1_byte (abfd, info_ptr); |
| info_ptr += 1; |
| signed_addr = bfd_get_sign_extend_vma (abfd); |
| if (signed_addr < 0) |
| internal_error (__FILE__, __LINE__, |
| _("read_comp_unit_head: dwarf from non elf file")); |
| cu_header->signed_addr_p = signed_addr; |
| |
| return info_ptr; |
| } |
| |
| /* Helper function that returns the proper abbrev section for |
| THIS_CU. */ |
| |
| static struct dwarf2_section_info * |
| get_abbrev_section_for_cu (struct dwarf2_per_cu_data *this_cu) |
| { |
| struct dwarf2_section_info *abbrev; |
| |
| if (this_cu->is_dwz) |
| abbrev = &dwarf2_get_dwz_file ()->abbrev; |
| else |
| abbrev = &dwarf2_per_objfile->abbrev; |
| |
| return abbrev; |
| } |
| |
| /* Subroutine of read_and_check_comp_unit_head and |
| read_and_check_type_unit_head to simplify them. |
| Perform various error checking on the header. */ |
| |
| static void |
| error_check_comp_unit_head (struct comp_unit_head *header, |
| struct dwarf2_section_info *section, |
| struct dwarf2_section_info *abbrev_section) |
| { |
| const char *filename = get_section_file_name (section); |
| |
| if (header->version != 2 && header->version != 3 && header->version != 4) |
| error (_("Dwarf Error: wrong version in compilation unit header " |
| "(is %d, should be 2, 3, or 4) [in module %s]"), header->version, |
| filename); |
| |
| if (header->abbrev_offset.sect_off |
| >= dwarf2_section_size (dwarf2_per_objfile->objfile, abbrev_section)) |
| error (_("Dwarf Error: bad offset (0x%lx) in compilation unit header " |
| "(offset 0x%lx + 6) [in module %s]"), |
| (long) header->abbrev_offset.sect_off, (long) header->offset.sect_off, |
| filename); |
| |
| /* Cast to unsigned long to use 64-bit arithmetic when possible to |
| avoid potential 32-bit overflow. */ |
| if (((unsigned long) header->offset.sect_off + get_cu_length (header)) |
| > section->size) |
| error (_("Dwarf Error: bad length (0x%lx) in compilation unit header " |
| "(offset 0x%lx + 0) [in module %s]"), |
| (long) header->length, (long) header->offset.sect_off, |
| filename); |
| } |
| |
| /* Read in a CU/TU header and perform some basic error checking. |
| The contents of the header are stored in HEADER. |
| The result is a pointer to the start of the first DIE. */ |
| |
| static const gdb_byte * |
| read_and_check_comp_unit_head (struct comp_unit_head *header, |
| struct dwarf2_section_info *section, |
| struct dwarf2_section_info *abbrev_section, |
| const gdb_byte *info_ptr, |
| int is_debug_types_section) |
| { |
| const gdb_byte *beg_of_comp_unit = info_ptr; |
| bfd *abfd = get_section_bfd_owner (section); |
| |
| header->offset.sect_off = beg_of_comp_unit - section->buffer; |
| |
| info_ptr = read_comp_unit_head (header, info_ptr, abfd); |
| |
| /* If we're reading a type unit, skip over the signature and |
| type_offset fields. */ |
| if (is_debug_types_section) |
| info_ptr += 8 /*signature*/ + header->offset_size; |
| |
| header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit; |
| |
| error_check_comp_unit_head (header, section, abbrev_section); |
| |
| return info_ptr; |
| } |
| |
| /* Read in the types comp unit header information from .debug_types entry at |
| types_ptr. The result is a pointer to one past the end of the header. */ |
| |
| static const gdb_byte * |
| read_and_check_type_unit_head (struct comp_unit_head *header, |
| struct dwarf2_section_info *section, |
| struct dwarf2_section_info *abbrev_section, |
| const gdb_byte *info_ptr, |
| ULONGEST *signature, |
| cu_offset *type_offset_in_tu) |
| { |
| const gdb_byte *beg_of_comp_unit = info_ptr; |
| bfd *abfd = get_section_bfd_owner (section); |
| |
| header->offset.sect_off = beg_of_comp_unit - section->buffer; |
| |
| info_ptr = read_comp_unit_head (header, info_ptr, abfd); |
| |
| /* If we're reading a type unit, skip over the signature and |
| type_offset fields. */ |
| if (signature != NULL) |
| *signature = read_8_bytes (abfd, info_ptr); |
| info_ptr += 8; |
| if (type_offset_in_tu != NULL) |
| type_offset_in_tu->cu_off = read_offset_1 (abfd, info_ptr, |
| header->offset_size); |
| info_ptr += header->offset_size; |
| |
| header->first_die_offset.cu_off = info_ptr - beg_of_comp_unit; |
| |
| error_check_comp_unit_head (header, section, abbrev_section); |
| |
| return info_ptr; |
| } |
| |
| /* Fetch the abbreviation table offset from a comp or type unit header. */ |
| |
| static sect_offset |
| read_abbrev_offset (struct dwarf2_section_info *section, |
| sect_offset offset) |
| { |
| bfd *abfd = get_section_bfd_owner (section); |
| const gdb_byte *info_ptr; |
| unsigned int initial_length_size, offset_size; |
| sect_offset abbrev_offset; |
| |
| dwarf2_read_section (dwarf2_per_objfile->objfile, section); |
| info_ptr = section->buffer + offset.sect_off; |
| read_initial_length (abfd, info_ptr, &initial_length_size); |
| offset_size = initial_length_size == 4 ? 4 : 8; |
| info_ptr += initial_length_size + 2 /*version*/; |
| abbrev_offset.sect_off = read_offset_1 (abfd, info_ptr, offset_size); |
| return abbrev_offset; |
| } |
| |
| /* Allocate a new partial symtab for file named NAME and mark this new |
| partial symtab as being an include of PST. */ |
| |
| static void |
| dwarf2_create_include_psymtab (const char *name, struct partial_symtab *pst, |
| struct objfile *objfile) |
| { |
| struct partial_symtab *subpst = allocate_psymtab (name, objfile); |
| |
| if (!IS_ABSOLUTE_PATH (subpst->filename)) |
| { |
| /* It shares objfile->objfile_obstack. */ |
| subpst->dirname = pst->dirname; |
| } |
| |
| subpst->textlow = 0; |
| subpst->texthigh = 0; |
| |
| subpst->dependencies |
| = XOBNEW (&objfile->objfile_obstack, struct partial_symtab *); |
| subpst->dependencies[0] = pst; |
| subpst->number_of_dependencies = 1; |
| |
| subpst->globals_offset = 0; |
| subpst->n_global_syms = 0; |
| subpst->statics_offset = 0; |
| subpst->n_static_syms = 0; |
| subpst->compunit_symtab = NULL; |
| subpst->read_symtab = pst->read_symtab; |
| subpst->readin = 0; |
| |
| /* No private part is necessary for include psymtabs. This property |
| can be used to differentiate between such include psymtabs and |
| the regular ones. */ |
| subpst->read_symtab_private = NULL; |
| } |
| |
| /* Read the Line Number Program data and extract the list of files |
| included by the source file represented by PST. Build an include |
| partial symtab for each of these included files. */ |
| |
| static void |
| dwarf2_build_include_psymtabs (struct dwarf2_cu *cu, |
| struct die_info *die, |
| struct partial_symtab *pst) |
| { |
| struct line_header *lh = NULL; |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_stmt_list, cu); |
| if (attr) |
| lh = dwarf_decode_line_header (DW_UNSND (attr), cu); |
| if (lh == NULL) |
| return; /* No linetable, so no includes. */ |
| |
| /* NOTE: pst->dirname is DW_AT_comp_dir (if present). */ |
| dwarf_decode_lines (lh, pst->dirname, cu, pst, pst->textlow, 1); |
| |
| free_line_header (lh); |
| } |
| |
| static hashval_t |
| hash_signatured_type (const void *item) |
| { |
| const struct signatured_type *sig_type |
| = (const struct signatured_type *) item; |
| |
| /* This drops the top 32 bits of the signature, but is ok for a hash. */ |
| return sig_type->signature; |
| } |
| |
| static int |
| eq_signatured_type (const void *item_lhs, const void *item_rhs) |
| { |
| const struct signatured_type *lhs = (const struct signatured_type *) item_lhs; |
| const struct signatured_type *rhs = (const struct signatured_type *) item_rhs; |
| |
| return lhs->signature == rhs->signature; |
| } |
| |
| /* Allocate a hash table for signatured types. */ |
| |
| static htab_t |
| allocate_signatured_type_table (struct objfile *objfile) |
| { |
| return htab_create_alloc_ex (41, |
| hash_signatured_type, |
| eq_signatured_type, |
| NULL, |
| &objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| /* A helper function to add a signatured type CU to a table. */ |
| |
| static int |
| add_signatured_type_cu_to_table (void **slot, void *datum) |
| { |
| struct signatured_type *sigt = (struct signatured_type *) *slot; |
| struct signatured_type ***datap = (struct signatured_type ***) datum; |
| |
| **datap = sigt; |
| ++*datap; |
| |
| return 1; |
| } |
| |
| /* Create the hash table of all entries in the .debug_types |
| (or .debug_types.dwo) section(s). |
| If reading a DWO file, then DWO_FILE is a pointer to the DWO file object, |
| otherwise it is NULL. |
| |
| The result is a pointer to the hash table or NULL if there are no types. |
| |
| Note: This function processes DWO files only, not DWP files. */ |
| |
| static htab_t |
| create_debug_types_hash_table (struct dwo_file *dwo_file, |
| VEC (dwarf2_section_info_def) *types) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| htab_t types_htab = NULL; |
| int ix; |
| struct dwarf2_section_info *section; |
| struct dwarf2_section_info *abbrev_section; |
| |
| if (VEC_empty (dwarf2_section_info_def, types)) |
| return NULL; |
| |
| abbrev_section = (dwo_file != NULL |
| ? &dwo_file->sections.abbrev |
| : &dwarf2_per_objfile->abbrev); |
| |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "Reading .debug_types%s for %s:\n", |
| dwo_file ? ".dwo" : "", |
| get_section_file_name (abbrev_section)); |
| |
| for (ix = 0; |
| VEC_iterate (dwarf2_section_info_def, types, ix, section); |
| ++ix) |
| { |
| bfd *abfd; |
| const gdb_byte *info_ptr, *end_ptr; |
| |
| dwarf2_read_section (objfile, section); |
| info_ptr = section->buffer; |
| |
| if (info_ptr == NULL) |
| continue; |
| |
| /* We can't set abfd until now because the section may be empty or |
| not present, in which case the bfd is unknown. */ |
| abfd = get_section_bfd_owner (section); |
| |
| /* We don't use init_cutu_and_read_dies_simple, or some such, here |
| because we don't need to read any dies: the signature is in the |
| header. */ |
| |
| end_ptr = info_ptr + section->size; |
| while (info_ptr < end_ptr) |
| { |
| sect_offset offset; |
| cu_offset type_offset_in_tu; |
| ULONGEST signature; |
| struct signatured_type *sig_type; |
| struct dwo_unit *dwo_tu; |
| void **slot; |
| const gdb_byte *ptr = info_ptr; |
| struct comp_unit_head header; |
| unsigned int length; |
| |
| offset.sect_off = ptr - section->buffer; |
| |
| /* We need to read the type's signature in order to build the hash |
| table, but we don't need anything else just yet. */ |
| |
| ptr = read_and_check_type_unit_head (&header, section, |
| abbrev_section, ptr, |
| &signature, &type_offset_in_tu); |
| |
| length = get_cu_length (&header); |
| |
| /* Skip dummy type units. */ |
| if (ptr >= info_ptr + length |
| || peek_abbrev_code (abfd, ptr) == 0) |
| { |
| info_ptr += length; |
| continue; |
| } |
| |
| if (types_htab == NULL) |
| { |
| if (dwo_file) |
| types_htab = allocate_dwo_unit_table (objfile); |
| else |
| types_htab = allocate_signatured_type_table (objfile); |
| } |
| |
| if (dwo_file) |
| { |
| sig_type = NULL; |
| dwo_tu = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwo_unit); |
| dwo_tu->dwo_file = dwo_file; |
| dwo_tu->signature = signature; |
| dwo_tu->type_offset_in_tu = type_offset_in_tu; |
| dwo_tu->section = section; |
| dwo_tu->offset = offset; |
| dwo_tu->length = length; |
| } |
| else |
| { |
| /* N.B.: type_offset is not usable if this type uses a DWO file. |
| The real type_offset is in the DWO file. */ |
| dwo_tu = NULL; |
| sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct signatured_type); |
| sig_type->signature = signature; |
| sig_type->type_offset_in_tu = type_offset_in_tu; |
| sig_type->per_cu.objfile = objfile; |
| sig_type->per_cu.is_debug_types = 1; |
| sig_type->per_cu.section = section; |
| sig_type->per_cu.offset = offset; |
| sig_type->per_cu.length = length; |
| } |
| |
| slot = htab_find_slot (types_htab, |
| dwo_file ? (void*) dwo_tu : (void *) sig_type, |
| INSERT); |
| gdb_assert (slot != NULL); |
| if (*slot != NULL) |
| { |
| sect_offset dup_offset; |
| |
| if (dwo_file) |
| { |
| const struct dwo_unit *dup_tu |
| = (const struct dwo_unit *) *slot; |
| |
| dup_offset = dup_tu->offset; |
| } |
| else |
| { |
| const struct signatured_type *dup_tu |
| = (const struct signatured_type *) *slot; |
| |
| dup_offset = dup_tu->per_cu.offset; |
| } |
| |
| complaint (&symfile_complaints, |
| _("debug type entry at offset 0x%x is duplicate to" |
| " the entry at offset 0x%x, signature %s"), |
| offset.sect_off, dup_offset.sect_off, |
| hex_string (signature)); |
| } |
| *slot = dwo_file ? (void *) dwo_tu : (void *) sig_type; |
| |
| if (dwarf_read_debug > 1) |
| fprintf_unfiltered (gdb_stdlog, " offset 0x%x, signature %s\n", |
| offset.sect_off, |
| hex_string (signature)); |
| |
| info_ptr += length; |
| } |
| } |
| |
| return types_htab; |
| } |
| |
| /* Create the hash table of all entries in the .debug_types section, |
| and initialize all_type_units. |
| The result is zero if there is an error (e.g. missing .debug_types section), |
| otherwise non-zero. */ |
| |
| static int |
| create_all_type_units (struct objfile *objfile) |
| { |
| htab_t types_htab; |
| struct signatured_type **iter; |
| |
| types_htab = create_debug_types_hash_table (NULL, dwarf2_per_objfile->types); |
| if (types_htab == NULL) |
| { |
| dwarf2_per_objfile->signatured_types = NULL; |
| return 0; |
| } |
| |
| dwarf2_per_objfile->signatured_types = types_htab; |
| |
| dwarf2_per_objfile->n_type_units |
| = dwarf2_per_objfile->n_allocated_type_units |
| = htab_elements (types_htab); |
| dwarf2_per_objfile->all_type_units = |
| XNEWVEC (struct signatured_type *, dwarf2_per_objfile->n_type_units); |
| iter = &dwarf2_per_objfile->all_type_units[0]; |
| htab_traverse_noresize (types_htab, add_signatured_type_cu_to_table, &iter); |
| gdb_assert (iter - &dwarf2_per_objfile->all_type_units[0] |
| == dwarf2_per_objfile->n_type_units); |
| |
| return 1; |
| } |
| |
| /* Add an entry for signature SIG to dwarf2_per_objfile->signatured_types. |
| If SLOT is non-NULL, it is the entry to use in the hash table. |
| Otherwise we find one. */ |
| |
| static struct signatured_type * |
| add_type_unit (ULONGEST sig, void **slot) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| int n_type_units = dwarf2_per_objfile->n_type_units; |
| struct signatured_type *sig_type; |
| |
| gdb_assert (n_type_units <= dwarf2_per_objfile->n_allocated_type_units); |
| ++n_type_units; |
| if (n_type_units > dwarf2_per_objfile->n_allocated_type_units) |
| { |
| if (dwarf2_per_objfile->n_allocated_type_units == 0) |
| dwarf2_per_objfile->n_allocated_type_units = 1; |
| dwarf2_per_objfile->n_allocated_type_units *= 2; |
| dwarf2_per_objfile->all_type_units |
| = XRESIZEVEC (struct signatured_type *, |
| dwarf2_per_objfile->all_type_units, |
| dwarf2_per_objfile->n_allocated_type_units); |
| ++dwarf2_per_objfile->tu_stats.nr_all_type_units_reallocs; |
| } |
| dwarf2_per_objfile->n_type_units = n_type_units; |
| |
| sig_type = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct signatured_type); |
| dwarf2_per_objfile->all_type_units[n_type_units - 1] = sig_type; |
| sig_type->signature = sig; |
| sig_type->per_cu.is_debug_types = 1; |
| if (dwarf2_per_objfile->using_index) |
| { |
| sig_type->per_cu.v.quick = |
| OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_quick_data); |
| } |
| |
| if (slot == NULL) |
| { |
| slot = htab_find_slot (dwarf2_per_objfile->signatured_types, |
| sig_type, INSERT); |
| } |
| gdb_assert (*slot == NULL); |
| *slot = sig_type; |
| /* The rest of sig_type must be filled in by the caller. */ |
| return sig_type; |
| } |
| |
| /* Subroutine of lookup_dwo_signatured_type and lookup_dwp_signatured_type. |
| Fill in SIG_ENTRY with DWO_ENTRY. */ |
| |
| static void |
| fill_in_sig_entry_from_dwo_entry (struct objfile *objfile, |
| struct signatured_type *sig_entry, |
| struct dwo_unit *dwo_entry) |
| { |
| /* Make sure we're not clobbering something we don't expect to. */ |
| gdb_assert (! sig_entry->per_cu.queued); |
| gdb_assert (sig_entry->per_cu.cu == NULL); |
| if (dwarf2_per_objfile->using_index) |
| { |
| gdb_assert (sig_entry->per_cu.v.quick != NULL); |
| gdb_assert (sig_entry->per_cu.v.quick->compunit_symtab == NULL); |
| } |
| else |
| gdb_assert (sig_entry->per_cu.v.psymtab == NULL); |
| gdb_assert (sig_entry->signature == dwo_entry->signature); |
| gdb_assert (sig_entry->type_offset_in_section.sect_off == 0); |
| gdb_assert (sig_entry->type_unit_group == NULL); |
| gdb_assert (sig_entry->dwo_unit == NULL); |
| |
| sig_entry->per_cu.section = dwo_entry->section; |
| sig_entry->per_cu.offset = dwo_entry->offset; |
| sig_entry->per_cu.length = dwo_entry->length; |
| sig_entry->per_cu.reading_dwo_directly = 1; |
| sig_entry->per_cu.objfile = objfile; |
| sig_entry->type_offset_in_tu = dwo_entry->type_offset_in_tu; |
| sig_entry->dwo_unit = dwo_entry; |
| } |
| |
| /* Subroutine of lookup_signatured_type. |
| If we haven't read the TU yet, create the signatured_type data structure |
| for a TU to be read in directly from a DWO file, bypassing the stub. |
| This is the "Stay in DWO Optimization": When there is no DWP file and we're |
| using .gdb_index, then when reading a CU we want to stay in the DWO file |
| containing that CU. Otherwise we could end up reading several other DWO |
| files (due to comdat folding) to process the transitive closure of all the |
| mentioned TUs, and that can be slow. The current DWO file will have every |
| type signature that it needs. |
| We only do this for .gdb_index because in the psymtab case we already have |
| to read all the DWOs to build the type unit groups. */ |
| |
| static struct signatured_type * |
| lookup_dwo_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwo_file *dwo_file; |
| struct dwo_unit find_dwo_entry, *dwo_entry; |
| struct signatured_type find_sig_entry, *sig_entry; |
| void **slot; |
| |
| gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index); |
| |
| /* If TU skeletons have been removed then we may not have read in any |
| TUs yet. */ |
| if (dwarf2_per_objfile->signatured_types == NULL) |
| { |
| dwarf2_per_objfile->signatured_types |
| = allocate_signatured_type_table (objfile); |
| } |
| |
| /* We only ever need to read in one copy of a signatured type. |
| Use the global signatured_types array to do our own comdat-folding |
| of types. If this is the first time we're reading this TU, and |
| the TU has an entry in .gdb_index, replace the recorded data from |
| .gdb_index with this TU. */ |
| |
| find_sig_entry.signature = sig; |
| slot = htab_find_slot (dwarf2_per_objfile->signatured_types, |
| &find_sig_entry, INSERT); |
| sig_entry = (struct signatured_type *) *slot; |
| |
| /* We can get here with the TU already read, *or* in the process of being |
| read. Don't reassign the global entry to point to this DWO if that's |
| the case. Also note that if the TU is already being read, it may not |
| have come from a DWO, the program may be a mix of Fission-compiled |
| code and non-Fission-compiled code. */ |
| |
| /* Have we already tried to read this TU? |
| Note: sig_entry can be NULL if the skeleton TU was removed (thus it |
| needn't exist in the global table yet). */ |
| if (sig_entry != NULL && sig_entry->per_cu.tu_read) |
| return sig_entry; |
| |
| /* Note: cu->dwo_unit is the dwo_unit that references this TU, not the |
| dwo_unit of the TU itself. */ |
| dwo_file = cu->dwo_unit->dwo_file; |
| |
| /* Ok, this is the first time we're reading this TU. */ |
| if (dwo_file->tus == NULL) |
| return NULL; |
| find_dwo_entry.signature = sig; |
| dwo_entry = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_entry); |
| if (dwo_entry == NULL) |
| return NULL; |
| |
| /* If the global table doesn't have an entry for this TU, add one. */ |
| if (sig_entry == NULL) |
| sig_entry = add_type_unit (sig, slot); |
| |
| fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry); |
| sig_entry->per_cu.tu_read = 1; |
| return sig_entry; |
| } |
| |
| /* Subroutine of lookup_signatured_type. |
| Look up the type for signature SIG, and if we can't find SIG in .gdb_index |
| then try the DWP file. If the TU stub (skeleton) has been removed then |
| it won't be in .gdb_index. */ |
| |
| static struct signatured_type * |
| lookup_dwp_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwp_file *dwp_file = get_dwp_file (); |
| struct dwo_unit *dwo_entry; |
| struct signatured_type find_sig_entry, *sig_entry; |
| void **slot; |
| |
| gdb_assert (cu->dwo_unit && dwarf2_per_objfile->using_index); |
| gdb_assert (dwp_file != NULL); |
| |
| /* If TU skeletons have been removed then we may not have read in any |
| TUs yet. */ |
| if (dwarf2_per_objfile->signatured_types == NULL) |
| { |
| dwarf2_per_objfile->signatured_types |
| = allocate_signatured_type_table (objfile); |
| } |
| |
| find_sig_entry.signature = sig; |
| slot = htab_find_slot (dwarf2_per_objfile->signatured_types, |
| &find_sig_entry, INSERT); |
| sig_entry = (struct signatured_type *) *slot; |
| |
| /* Have we already tried to read this TU? |
| Note: sig_entry can be NULL if the skeleton TU was removed (thus it |
| needn't exist in the global table yet). */ |
| if (sig_entry != NULL) |
| return sig_entry; |
| |
| if (dwp_file->tus == NULL) |
| return NULL; |
| dwo_entry = lookup_dwo_unit_in_dwp (dwp_file, NULL, |
| sig, 1 /* is_debug_types */); |
| if (dwo_entry == NULL) |
| return NULL; |
| |
| sig_entry = add_type_unit (sig, slot); |
| fill_in_sig_entry_from_dwo_entry (objfile, sig_entry, dwo_entry); |
| |
| return sig_entry; |
| } |
| |
| /* Lookup a signature based type for DW_FORM_ref_sig8. |
| Returns NULL if signature SIG is not present in the table. |
| It is up to the caller to complain about this. */ |
| |
| static struct signatured_type * |
| lookup_signatured_type (struct dwarf2_cu *cu, ULONGEST sig) |
| { |
| if (cu->dwo_unit |
| && dwarf2_per_objfile->using_index) |
| { |
| /* We're in a DWO/DWP file, and we're using .gdb_index. |
| These cases require special processing. */ |
| if (get_dwp_file () == NULL) |
| return lookup_dwo_signatured_type (cu, sig); |
| else |
| return lookup_dwp_signatured_type (cu, sig); |
| } |
| else |
| { |
| struct signatured_type find_entry, *entry; |
| |
| if (dwarf2_per_objfile->signatured_types == NULL) |
| return NULL; |
| find_entry.signature = sig; |
| entry = ((struct signatured_type *) |
| htab_find (dwarf2_per_objfile->signatured_types, &find_entry)); |
| return entry; |
| } |
| } |
| |
| /* Low level DIE reading support. */ |
| |
| /* Initialize a die_reader_specs struct from a dwarf2_cu struct. */ |
| |
| static void |
| init_cu_die_reader (struct die_reader_specs *reader, |
| struct dwarf2_cu *cu, |
| struct dwarf2_section_info *section, |
| struct dwo_file *dwo_file) |
| { |
| gdb_assert (section->readin && section->buffer != NULL); |
| reader->abfd = get_section_bfd_owner (section); |
| reader->cu = cu; |
| reader->dwo_file = dwo_file; |
| reader->die_section = section; |
| reader->buffer = section->buffer; |
| reader->buffer_end = section->buffer + section->size; |
| reader->comp_dir = NULL; |
| } |
| |
| /* Subroutine of init_cutu_and_read_dies to simplify it. |
| Read in the rest of a CU/TU top level DIE from DWO_UNIT. |
| There's just a lot of work to do, and init_cutu_and_read_dies is big enough |
| already. |
| |
| STUB_COMP_UNIT_DIE is for the stub DIE, we copy over certain attributes |
| from it to the DIE in the DWO. If NULL we are skipping the stub. |
| STUB_COMP_DIR is similar to STUB_COMP_UNIT_DIE: When reading a TU directly |
| from the DWO file, bypassing the stub, it contains the DW_AT_comp_dir |
| attribute of the referencing CU. At most one of STUB_COMP_UNIT_DIE and |
| STUB_COMP_DIR may be non-NULL. |
| *RESULT_READER,*RESULT_INFO_PTR,*RESULT_COMP_UNIT_DIE,*RESULT_HAS_CHILDREN |
| are filled in with the info of the DIE from the DWO file. |
| ABBREV_TABLE_PROVIDED is non-zero if the caller of init_cutu_and_read_dies |
| provided an abbrev table to use. |
| The result is non-zero if a valid (non-dummy) DIE was found. */ |
| |
| static int |
| read_cutu_die_from_dwo (struct dwarf2_per_cu_data *this_cu, |
| struct dwo_unit *dwo_unit, |
| int abbrev_table_provided, |
| struct die_info *stub_comp_unit_die, |
| const char *stub_comp_dir, |
| struct die_reader_specs *result_reader, |
| const gdb_byte **result_info_ptr, |
| struct die_info **result_comp_unit_die, |
| int *result_has_children) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_cu *cu = this_cu->cu; |
| struct dwarf2_section_info *section; |
| bfd *abfd; |
| const gdb_byte *begin_info_ptr, *info_ptr; |
| ULONGEST signature; /* Or dwo_id. */ |
| struct attribute *comp_dir, *stmt_list, *low_pc, *high_pc, *ranges; |
| int i,num_extra_attrs; |
| struct dwarf2_section_info *dwo_abbrev_section; |
| struct attribute *attr; |
| struct die_info *comp_unit_die; |
| |
| /* At most one of these may be provided. */ |
| gdb_assert ((stub_comp_unit_die != NULL) + (stub_comp_dir != NULL) <= 1); |
| |
| /* These attributes aren't processed until later: |
| DW_AT_stmt_list, DW_AT_low_pc, DW_AT_high_pc, DW_AT_ranges. |
| DW_AT_comp_dir is used now, to find the DWO file, but it is also |
| referenced later. However, these attributes are found in the stub |
| which we won't have later. In order to not impose this complication |
| on the rest of the code, we read them here and copy them to the |
| DWO CU/TU die. */ |
| |
| stmt_list = NULL; |
| low_pc = NULL; |
| high_pc = NULL; |
| ranges = NULL; |
| comp_dir = NULL; |
| |
| if (stub_comp_unit_die != NULL) |
| { |
| /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the |
| DWO file. */ |
| if (! this_cu->is_debug_types) |
| stmt_list = dwarf2_attr (stub_comp_unit_die, DW_AT_stmt_list, cu); |
| low_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_low_pc, cu); |
| high_pc = dwarf2_attr (stub_comp_unit_die, DW_AT_high_pc, cu); |
| ranges = dwarf2_attr (stub_comp_unit_die, DW_AT_ranges, cu); |
| comp_dir = dwarf2_attr (stub_comp_unit_die, DW_AT_comp_dir, cu); |
| |
| /* There should be a DW_AT_addr_base attribute here (if needed). |
| We need the value before we can process DW_FORM_GNU_addr_index. */ |
| cu->addr_base = 0; |
| attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_addr_base, cu); |
| if (attr) |
| cu->addr_base = DW_UNSND (attr); |
| |
| /* There should be a DW_AT_ranges_base attribute here (if needed). |
| We need the value before we can process DW_AT_ranges. */ |
| cu->ranges_base = 0; |
| attr = dwarf2_attr (stub_comp_unit_die, DW_AT_GNU_ranges_base, cu); |
| if (attr) |
| cu->ranges_base = DW_UNSND (attr); |
| } |
| else if (stub_comp_dir != NULL) |
| { |
| /* Reconstruct the comp_dir attribute to simplify the code below. */ |
| comp_dir = XOBNEW (&cu->comp_unit_obstack, struct attribute); |
| comp_dir->name = DW_AT_comp_dir; |
| comp_dir->form = DW_FORM_string; |
| DW_STRING_IS_CANONICAL (comp_dir) = 0; |
| DW_STRING (comp_dir) = stub_comp_dir; |
| } |
| |
| /* Set up for reading the DWO CU/TU. */ |
| cu->dwo_unit = dwo_unit; |
| section = dwo_unit->section; |
| dwarf2_read_section (objfile, section); |
| abfd = get_section_bfd_owner (section); |
| begin_info_ptr = info_ptr = section->buffer + dwo_unit->offset.sect_off; |
| dwo_abbrev_section = &dwo_unit->dwo_file->sections.abbrev; |
| init_cu_die_reader (result_reader, cu, section, dwo_unit->dwo_file); |
| |
| if (this_cu->is_debug_types) |
| { |
| ULONGEST header_signature; |
| cu_offset type_offset_in_tu; |
| struct signatured_type *sig_type = (struct signatured_type *) this_cu; |
| |
| info_ptr = read_and_check_type_unit_head (&cu->header, section, |
| dwo_abbrev_section, |
| info_ptr, |
| &header_signature, |
| &type_offset_in_tu); |
| /* This is not an assert because it can be caused by bad debug info. */ |
| if (sig_type->signature != header_signature) |
| { |
| error (_("Dwarf Error: signature mismatch %s vs %s while reading" |
| " TU at offset 0x%x [in module %s]"), |
| hex_string (sig_type->signature), |
| hex_string (header_signature), |
| dwo_unit->offset.sect_off, |
| bfd_get_filename (abfd)); |
| } |
| gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off); |
| /* For DWOs coming from DWP files, we don't know the CU length |
| nor the type's offset in the TU until now. */ |
| dwo_unit->length = get_cu_length (&cu->header); |
| dwo_unit->type_offset_in_tu = type_offset_in_tu; |
| |
| /* Establish the type offset that can be used to lookup the type. |
| For DWO files, we don't know it until now. */ |
| sig_type->type_offset_in_section.sect_off = |
| dwo_unit->offset.sect_off + dwo_unit->type_offset_in_tu.cu_off; |
| } |
| else |
| { |
| info_ptr = read_and_check_comp_unit_head (&cu->header, section, |
| dwo_abbrev_section, |
| info_ptr, 0); |
| gdb_assert (dwo_unit->offset.sect_off == cu->header.offset.sect_off); |
| /* For DWOs coming from DWP files, we don't know the CU length |
| until now. */ |
| dwo_unit->length = get_cu_length (&cu->header); |
| } |
| |
| /* Replace the CU's original abbrev table with the DWO's. |
| Reminder: We can't read the abbrev table until we've read the header. */ |
| if (abbrev_table_provided) |
| { |
| /* Don't free the provided abbrev table, the caller of |
| init_cutu_and_read_dies owns it. */ |
| dwarf2_read_abbrevs (cu, dwo_abbrev_section); |
| /* Ensure the DWO abbrev table gets freed. */ |
| make_cleanup (dwarf2_free_abbrev_table, cu); |
| } |
| else |
| { |
| dwarf2_free_abbrev_table (cu); |
| dwarf2_read_abbrevs (cu, dwo_abbrev_section); |
| /* Leave any existing abbrev table cleanup as is. */ |
| } |
| |
| /* Read in the die, but leave space to copy over the attributes |
| from the stub. This has the benefit of simplifying the rest of |
| the code - all the work to maintain the illusion of a single |
| DW_TAG_{compile,type}_unit DIE is done here. */ |
| num_extra_attrs = ((stmt_list != NULL) |
| + (low_pc != NULL) |
| + (high_pc != NULL) |
| + (ranges != NULL) |
| + (comp_dir != NULL)); |
| info_ptr = read_full_die_1 (result_reader, result_comp_unit_die, info_ptr, |
| result_has_children, num_extra_attrs); |
| |
| /* Copy over the attributes from the stub to the DIE we just read in. */ |
| comp_unit_die = *result_comp_unit_die; |
| i = comp_unit_die->num_attrs; |
| if (stmt_list != NULL) |
| comp_unit_die->attrs[i++] = *stmt_list; |
| if (low_pc != NULL) |
| comp_unit_die->attrs[i++] = *low_pc; |
| if (high_pc != NULL) |
| comp_unit_die->attrs[i++] = *high_pc; |
| if (ranges != NULL) |
| comp_unit_die->attrs[i++] = *ranges; |
| if (comp_dir != NULL) |
| comp_unit_die->attrs[i++] = *comp_dir; |
| comp_unit_die->num_attrs += num_extra_attrs; |
| |
| if (dwarf_die_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Read die from %s@0x%x of %s:\n", |
| get_section_name (section), |
| (unsigned) (begin_info_ptr - section->buffer), |
| bfd_get_filename (abfd)); |
| dump_die (comp_unit_die, dwarf_die_debug); |
| } |
| |
| /* Save the comp_dir attribute. If there is no DWP file then we'll read |
| TUs by skipping the stub and going directly to the entry in the DWO file. |
| However, skipping the stub means we won't get DW_AT_comp_dir, so we have |
| to get it via circuitous means. Blech. */ |
| if (comp_dir != NULL) |
| result_reader->comp_dir = DW_STRING (comp_dir); |
| |
| /* Skip dummy compilation units. */ |
| if (info_ptr >= begin_info_ptr + dwo_unit->length |
| || peek_abbrev_code (abfd, info_ptr) == 0) |
| return 0; |
| |
| *result_info_ptr = info_ptr; |
| return 1; |
| } |
| |
| /* Subroutine of init_cutu_and_read_dies to simplify it. |
| Look up the DWO unit specified by COMP_UNIT_DIE of THIS_CU. |
| Returns NULL if the specified DWO unit cannot be found. */ |
| |
| static struct dwo_unit * |
| lookup_dwo_unit (struct dwarf2_per_cu_data *this_cu, |
| struct die_info *comp_unit_die) |
| { |
| struct dwarf2_cu *cu = this_cu->cu; |
| struct attribute *attr; |
| ULONGEST signature; |
| struct dwo_unit *dwo_unit; |
| const char *comp_dir, *dwo_name; |
| |
| gdb_assert (cu != NULL); |
| |
| /* Yeah, we look dwo_name up again, but it simplifies the code. */ |
| dwo_name = dwarf2_string_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu); |
| comp_dir = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu); |
| |
| if (this_cu->is_debug_types) |
| { |
| struct signatured_type *sig_type; |
| |
| /* Since this_cu is the first member of struct signatured_type, |
| we can go from a pointer to one to a pointer to the other. */ |
| sig_type = (struct signatured_type *) this_cu; |
| signature = sig_type->signature; |
| dwo_unit = lookup_dwo_type_unit (sig_type, dwo_name, comp_dir); |
| } |
| else |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu); |
| if (! attr) |
| error (_("Dwarf Error: missing dwo_id for dwo_name %s" |
| " [in module %s]"), |
| dwo_name, objfile_name (this_cu->objfile)); |
| signature = DW_UNSND (attr); |
| dwo_unit = lookup_dwo_comp_unit (this_cu, dwo_name, comp_dir, |
| signature); |
| } |
| |
| return dwo_unit; |
| } |
| |
| /* Subroutine of init_cutu_and_read_dies to simplify it. |
| See it for a description of the parameters. |
| Read a TU directly from a DWO file, bypassing the stub. |
| |
| Note: This function could be a little bit simpler if we shared cleanups |
| with our caller, init_cutu_and_read_dies. That's generally a fragile thing |
| to do, so we keep this function self-contained. Or we could move this |
| into our caller, but it's complex enough already. */ |
| |
| static void |
| init_tu_and_read_dwo_dies (struct dwarf2_per_cu_data *this_cu, |
| int use_existing_cu, int keep, |
| die_reader_func_ftype *die_reader_func, |
| void *data) |
| { |
| struct dwarf2_cu *cu; |
| struct signatured_type *sig_type; |
| struct cleanup *cleanups, *free_cu_cleanup = NULL; |
| struct die_reader_specs reader; |
| const gdb_byte *info_ptr; |
| struct die_info *comp_unit_die; |
| int has_children; |
| |
| /* Verify we can do the following downcast, and that we have the |
| data we need. */ |
| gdb_assert (this_cu->is_debug_types && this_cu->reading_dwo_directly); |
| sig_type = (struct signatured_type *) this_cu; |
| gdb_assert (sig_type->dwo_unit != NULL); |
| |
| cleanups = make_cleanup (null_cleanup, NULL); |
| |
| if (use_existing_cu && this_cu->cu != NULL) |
| { |
| gdb_assert (this_cu->cu->dwo_unit == sig_type->dwo_unit); |
| cu = this_cu->cu; |
| /* There's no need to do the rereading_dwo_cu handling that |
| init_cutu_and_read_dies does since we don't read the stub. */ |
| } |
| else |
| { |
| /* If !use_existing_cu, this_cu->cu must be NULL. */ |
| gdb_assert (this_cu->cu == NULL); |
| cu = XNEW (struct dwarf2_cu); |
| init_one_comp_unit (cu, this_cu); |
| /* If an error occurs while loading, release our storage. */ |
| free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu); |
| } |
| |
| /* A future optimization, if needed, would be to use an existing |
| abbrev table. When reading DWOs with skeletonless TUs, all the TUs |
| could share abbrev tables. */ |
| |
| if (read_cutu_die_from_dwo (this_cu, sig_type->dwo_unit, |
| 0 /* abbrev_table_provided */, |
| NULL /* stub_comp_unit_die */, |
| sig_type->dwo_unit->dwo_file->comp_dir, |
| &reader, &info_ptr, |
| &comp_unit_die, &has_children) == 0) |
| { |
| /* Dummy die. */ |
| do_cleanups (cleanups); |
| return; |
| } |
| |
| /* All the "real" work is done here. */ |
| die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data); |
| |
| /* This duplicates the code in init_cutu_and_read_dies, |
| but the alternative is making the latter more complex. |
| This function is only for the special case of using DWO files directly: |
| no point in overly complicating the general case just to handle this. */ |
| if (free_cu_cleanup != NULL) |
| { |
| if (keep) |
| { |
| /* We've successfully allocated this compilation unit. Let our |
| caller clean it up when finished with it. */ |
| discard_cleanups (free_cu_cleanup); |
| |
| /* We can only discard free_cu_cleanup and all subsequent cleanups. |
| So we have to manually free the abbrev table. */ |
| dwarf2_free_abbrev_table (cu); |
| |
| /* Link this CU into read_in_chain. */ |
| this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain; |
| dwarf2_per_objfile->read_in_chain = this_cu; |
| } |
| else |
| do_cleanups (free_cu_cleanup); |
| } |
| |
| do_cleanups (cleanups); |
| } |
| |
| /* Initialize a CU (or TU) and read its DIEs. |
| If the CU defers to a DWO file, read the DWO file as well. |
| |
| ABBREV_TABLE, if non-NULL, is the abbreviation table to use. |
| Otherwise the table specified in the comp unit header is read in and used. |
| This is an optimization for when we already have the abbrev table. |
| |
| If USE_EXISTING_CU is non-zero, and THIS_CU->cu is non-NULL, then use it. |
| Otherwise, a new CU is allocated with xmalloc. |
| |
| If KEEP is non-zero, then if we allocated a dwarf2_cu we add it to |
| read_in_chain. Otherwise the dwarf2_cu data is freed at the end. |
| |
| WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental |
| linker) then DIE_READER_FUNC will not get called. */ |
| |
| static void |
| init_cutu_and_read_dies (struct dwarf2_per_cu_data *this_cu, |
| struct abbrev_table *abbrev_table, |
| int use_existing_cu, int keep, |
| die_reader_func_ftype *die_reader_func, |
| void *data) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_section_info *section = this_cu->section; |
| bfd *abfd = get_section_bfd_owner (section); |
| struct dwarf2_cu *cu; |
| const gdb_byte *begin_info_ptr, *info_ptr; |
| struct die_reader_specs reader; |
| struct die_info *comp_unit_die; |
| int has_children; |
| struct attribute *attr; |
| struct cleanup *cleanups, *free_cu_cleanup = NULL; |
| struct signatured_type *sig_type = NULL; |
| struct dwarf2_section_info *abbrev_section; |
| /* Non-zero if CU currently points to a DWO file and we need to |
| reread it. When this happens we need to reread the skeleton die |
| before we can reread the DWO file (this only applies to CUs, not TUs). */ |
| int rereading_dwo_cu = 0; |
| |
| if (dwarf_die_debug) |
| fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n", |
| this_cu->is_debug_types ? "type" : "comp", |
| this_cu->offset.sect_off); |
| |
| if (use_existing_cu) |
| gdb_assert (keep); |
| |
| /* If we're reading a TU directly from a DWO file, including a virtual DWO |
| file (instead of going through the stub), short-circuit all of this. */ |
| if (this_cu->reading_dwo_directly) |
| { |
| /* Narrow down the scope of possibilities to have to understand. */ |
| gdb_assert (this_cu->is_debug_types); |
| gdb_assert (abbrev_table == NULL); |
| init_tu_and_read_dwo_dies (this_cu, use_existing_cu, keep, |
| die_reader_func, data); |
| return; |
| } |
| |
| cleanups = make_cleanup (null_cleanup, NULL); |
| |
| /* This is cheap if the section is already read in. */ |
| dwarf2_read_section (objfile, section); |
| |
| begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off; |
| |
| abbrev_section = get_abbrev_section_for_cu (this_cu); |
| |
| if (use_existing_cu && this_cu->cu != NULL) |
| { |
| cu = this_cu->cu; |
| /* If this CU is from a DWO file we need to start over, we need to |
| refetch the attributes from the skeleton CU. |
| This could be optimized by retrieving those attributes from when we |
| were here the first time: the previous comp_unit_die was stored in |
| comp_unit_obstack. But there's no data yet that we need this |
| optimization. */ |
| if (cu->dwo_unit != NULL) |
| rereading_dwo_cu = 1; |
| } |
| else |
| { |
| /* If !use_existing_cu, this_cu->cu must be NULL. */ |
| gdb_assert (this_cu->cu == NULL); |
| cu = XNEW (struct dwarf2_cu); |
| init_one_comp_unit (cu, this_cu); |
| /* If an error occurs while loading, release our storage. */ |
| free_cu_cleanup = make_cleanup (free_heap_comp_unit, cu); |
| } |
| |
| /* Get the header. */ |
| if (cu->header.first_die_offset.cu_off != 0 && ! rereading_dwo_cu) |
| { |
| /* We already have the header, there's no need to read it in again. */ |
| info_ptr += cu->header.first_die_offset.cu_off; |
| } |
| else |
| { |
| if (this_cu->is_debug_types) |
| { |
| ULONGEST signature; |
| cu_offset type_offset_in_tu; |
| |
| info_ptr = read_and_check_type_unit_head (&cu->header, section, |
| abbrev_section, info_ptr, |
| &signature, |
| &type_offset_in_tu); |
| |
| /* Since per_cu is the first member of struct signatured_type, |
| we can go from a pointer to one to a pointer to the other. */ |
| sig_type = (struct signatured_type *) this_cu; |
| gdb_assert (sig_type->signature == signature); |
| gdb_assert (sig_type->type_offset_in_tu.cu_off |
| == type_offset_in_tu.cu_off); |
| gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off); |
| |
| /* LENGTH has not been set yet for type units if we're |
| using .gdb_index. */ |
| this_cu->length = get_cu_length (&cu->header); |
| |
| /* Establish the type offset that can be used to lookup the type. */ |
| sig_type->type_offset_in_section.sect_off = |
| this_cu->offset.sect_off + sig_type->type_offset_in_tu.cu_off; |
| } |
| else |
| { |
| info_ptr = read_and_check_comp_unit_head (&cu->header, section, |
| abbrev_section, |
| info_ptr, 0); |
| |
| gdb_assert (this_cu->offset.sect_off == cu->header.offset.sect_off); |
| gdb_assert (this_cu->length == get_cu_length (&cu->header)); |
| } |
| } |
| |
| /* Skip dummy compilation units. */ |
| if (info_ptr >= begin_info_ptr + this_cu->length |
| || peek_abbrev_code (abfd, info_ptr) == 0) |
| { |
| do_cleanups (cleanups); |
| return; |
| } |
| |
| /* If we don't have them yet, read the abbrevs for this compilation unit. |
| And if we need to read them now, make sure they're freed when we're |
| done. Note that it's important that if the CU had an abbrev table |
| on entry we don't free it when we're done: Somewhere up the call stack |
| it may be in use. */ |
| if (abbrev_table != NULL) |
| { |
| gdb_assert (cu->abbrev_table == NULL); |
| gdb_assert (cu->header.abbrev_offset.sect_off |
| == abbrev_table->offset.sect_off); |
| cu->abbrev_table = abbrev_table; |
| } |
| else if (cu->abbrev_table == NULL) |
| { |
| dwarf2_read_abbrevs (cu, abbrev_section); |
| make_cleanup (dwarf2_free_abbrev_table, cu); |
| } |
| else if (rereading_dwo_cu) |
| { |
| dwarf2_free_abbrev_table (cu); |
| dwarf2_read_abbrevs (cu, abbrev_section); |
| } |
| |
| /* Read the top level CU/TU die. */ |
| init_cu_die_reader (&reader, cu, section, NULL); |
| info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children); |
| |
| /* If we are in a DWO stub, process it and then read in the "real" CU/TU |
| from the DWO file. |
| Note that if USE_EXISTING_OK != 0, and THIS_CU->cu already contains a |
| DWO CU, that this test will fail (the attribute will not be present). */ |
| attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_name, cu); |
| if (attr) |
| { |
| struct dwo_unit *dwo_unit; |
| struct die_info *dwo_comp_unit_die; |
| |
| if (has_children) |
| { |
| complaint (&symfile_complaints, |
| _("compilation unit with DW_AT_GNU_dwo_name" |
| " has children (offset 0x%x) [in module %s]"), |
| this_cu->offset.sect_off, bfd_get_filename (abfd)); |
| } |
| dwo_unit = lookup_dwo_unit (this_cu, comp_unit_die); |
| if (dwo_unit != NULL) |
| { |
| if (read_cutu_die_from_dwo (this_cu, dwo_unit, |
| abbrev_table != NULL, |
| comp_unit_die, NULL, |
| &reader, &info_ptr, |
| &dwo_comp_unit_die, &has_children) == 0) |
| { |
| /* Dummy die. */ |
| do_cleanups (cleanups); |
| return; |
| } |
| comp_unit_die = dwo_comp_unit_die; |
| } |
| else |
| { |
| /* Yikes, we couldn't find the rest of the DIE, we only have |
| the stub. A complaint has already been logged. There's |
| not much more we can do except pass on the stub DIE to |
| die_reader_func. We don't want to throw an error on bad |
| debug info. */ |
| } |
| } |
| |
| /* All of the above is setup for this call. Yikes. */ |
| die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data); |
| |
| /* Done, clean up. */ |
| if (free_cu_cleanup != NULL) |
| { |
| if (keep) |
| { |
| /* We've successfully allocated this compilation unit. Let our |
| caller clean it up when finished with it. */ |
| discard_cleanups (free_cu_cleanup); |
| |
| /* We can only discard free_cu_cleanup and all subsequent cleanups. |
| So we have to manually free the abbrev table. */ |
| dwarf2_free_abbrev_table (cu); |
| |
| /* Link this CU into read_in_chain. */ |
| this_cu->cu->read_in_chain = dwarf2_per_objfile->read_in_chain; |
| dwarf2_per_objfile->read_in_chain = this_cu; |
| } |
| else |
| do_cleanups (free_cu_cleanup); |
| } |
| |
| do_cleanups (cleanups); |
| } |
| |
| /* Read CU/TU THIS_CU but do not follow DW_AT_GNU_dwo_name if present. |
| DWO_FILE, if non-NULL, is the DWO file to read (the caller is assumed |
| to have already done the lookup to find the DWO file). |
| |
| The caller is required to fill in THIS_CU->section, THIS_CU->offset, and |
| THIS_CU->is_debug_types, but nothing else. |
| |
| We fill in THIS_CU->length. |
| |
| WARNING: If THIS_CU is a "dummy CU" (used as filler by the incremental |
| linker) then DIE_READER_FUNC will not get called. |
| |
| THIS_CU->cu is always freed when done. |
| This is done in order to not leave THIS_CU->cu in a state where we have |
| to care whether it refers to the "main" CU or the DWO CU. */ |
| |
| static void |
| init_cutu_and_read_dies_no_follow (struct dwarf2_per_cu_data *this_cu, |
| struct dwo_file *dwo_file, |
| die_reader_func_ftype *die_reader_func, |
| void *data) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_section_info *section = this_cu->section; |
| bfd *abfd = get_section_bfd_owner (section); |
| struct dwarf2_section_info *abbrev_section; |
| struct dwarf2_cu cu; |
| const gdb_byte *begin_info_ptr, *info_ptr; |
| struct die_reader_specs reader; |
| struct cleanup *cleanups; |
| struct die_info *comp_unit_die; |
| int has_children; |
| |
| if (dwarf_die_debug) |
| fprintf_unfiltered (gdb_stdlog, "Reading %s unit at offset 0x%x\n", |
| this_cu->is_debug_types ? "type" : "comp", |
| this_cu->offset.sect_off); |
| |
| gdb_assert (this_cu->cu == NULL); |
| |
| abbrev_section = (dwo_file != NULL |
| ? &dwo_file->sections.abbrev |
| : get_abbrev_section_for_cu (this_cu)); |
| |
| /* This is cheap if the section is already read in. */ |
| dwarf2_read_section (objfile, section); |
| |
| init_one_comp_unit (&cu, this_cu); |
| |
| cleanups = make_cleanup (free_stack_comp_unit, &cu); |
| |
| begin_info_ptr = info_ptr = section->buffer + this_cu->offset.sect_off; |
| info_ptr = read_and_check_comp_unit_head (&cu.header, section, |
| abbrev_section, info_ptr, |
| this_cu->is_debug_types); |
| |
| this_cu->length = get_cu_length (&cu.header); |
| |
| /* Skip dummy compilation units. */ |
| if (info_ptr >= begin_info_ptr + this_cu->length |
| || peek_abbrev_code (abfd, info_ptr) == 0) |
| { |
| do_cleanups (cleanups); |
| return; |
| } |
| |
| dwarf2_read_abbrevs (&cu, abbrev_section); |
| make_cleanup (dwarf2_free_abbrev_table, &cu); |
| |
| init_cu_die_reader (&reader, &cu, section, dwo_file); |
| info_ptr = read_full_die (&reader, &comp_unit_die, info_ptr, &has_children); |
| |
| die_reader_func (&reader, info_ptr, comp_unit_die, has_children, data); |
| |
| do_cleanups (cleanups); |
| } |
| |
| /* Read a CU/TU, except that this does not look for DW_AT_GNU_dwo_name and |
| does not lookup the specified DWO file. |
| This cannot be used to read DWO files. |
| |
| THIS_CU->cu is always freed when done. |
| This is done in order to not leave THIS_CU->cu in a state where we have |
| to care whether it refers to the "main" CU or the DWO CU. |
| We can revisit this if the data shows there's a performance issue. */ |
| |
| static void |
| init_cutu_and_read_dies_simple (struct dwarf2_per_cu_data *this_cu, |
| die_reader_func_ftype *die_reader_func, |
| void *data) |
| { |
| init_cutu_and_read_dies_no_follow (this_cu, NULL, die_reader_func, data); |
| } |
| |
| /* Type Unit Groups. |
| |
| Type Unit Groups are a way to collapse the set of all TUs (type units) into |
| a more manageable set. The grouping is done by DW_AT_stmt_list entry |
| so that all types coming from the same compilation (.o file) are grouped |
| together. A future step could be to put the types in the same symtab as |
| the CU the types ultimately came from. */ |
| |
| static hashval_t |
| hash_type_unit_group (const void *item) |
| { |
| const struct type_unit_group *tu_group |
| = (const struct type_unit_group *) item; |
| |
| return hash_stmt_list_entry (&tu_group->hash); |
| } |
| |
| static int |
| eq_type_unit_group (const void *item_lhs, const void *item_rhs) |
| { |
| const struct type_unit_group *lhs = (const struct type_unit_group *) item_lhs; |
| const struct type_unit_group *rhs = (const struct type_unit_group *) item_rhs; |
| |
| return eq_stmt_list_entry (&lhs->hash, &rhs->hash); |
| } |
| |
| /* Allocate a hash table for type unit groups. */ |
| |
| static htab_t |
| allocate_type_unit_groups_table (void) |
| { |
| return htab_create_alloc_ex (3, |
| hash_type_unit_group, |
| eq_type_unit_group, |
| NULL, |
| &dwarf2_per_objfile->objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| /* Type units that don't have DW_AT_stmt_list are grouped into their own |
| partial symtabs. We combine several TUs per psymtab to not let the size |
| of any one psymtab grow too big. */ |
| #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB (1 << 31) |
| #define NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE 10 |
| |
| /* Helper routine for get_type_unit_group. |
| Create the type_unit_group object used to hold one or more TUs. */ |
| |
| static struct type_unit_group * |
| create_type_unit_group (struct dwarf2_cu *cu, sect_offset line_offset_struct) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_per_cu_data *per_cu; |
| struct type_unit_group *tu_group; |
| |
| tu_group = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct type_unit_group); |
| per_cu = &tu_group->per_cu; |
| per_cu->objfile = objfile; |
| |
| if (dwarf2_per_objfile->using_index) |
| { |
| per_cu->v.quick = OBSTACK_ZALLOC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_quick_data); |
| } |
| else |
| { |
| unsigned int line_offset = line_offset_struct.sect_off; |
| struct partial_symtab *pst; |
| char *name; |
| |
| /* Give the symtab a useful name for debug purposes. */ |
| if ((line_offset & NO_STMT_LIST_TYPE_UNIT_PSYMTAB) != 0) |
| name = xstrprintf ("<type_units_%d>", |
| (line_offset & ~NO_STMT_LIST_TYPE_UNIT_PSYMTAB)); |
| else |
| name = xstrprintf ("<type_units_at_0x%x>", line_offset); |
| |
| pst = create_partial_symtab (per_cu, name); |
| pst->anonymous = 1; |
| |
| xfree (name); |
| } |
| |
| tu_group->hash.dwo_unit = cu->dwo_unit; |
| tu_group->hash.line_offset = line_offset_struct; |
| |
| return tu_group; |
| } |
| |
| /* Look up the type_unit_group for type unit CU, and create it if necessary. |
| STMT_LIST is a DW_AT_stmt_list attribute. */ |
| |
| static struct type_unit_group * |
| get_type_unit_group (struct dwarf2_cu *cu, const struct attribute *stmt_list) |
| { |
| struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; |
| struct type_unit_group *tu_group; |
| void **slot; |
| unsigned int line_offset; |
| struct type_unit_group type_unit_group_for_lookup; |
| |
| if (dwarf2_per_objfile->type_unit_groups == NULL) |
| { |
| dwarf2_per_objfile->type_unit_groups = |
| allocate_type_unit_groups_table (); |
| } |
| |
| /* Do we need to create a new group, or can we use an existing one? */ |
| |
| if (stmt_list) |
| { |
| line_offset = DW_UNSND (stmt_list); |
| ++tu_stats->nr_symtab_sharers; |
| } |
| else |
| { |
| /* Ugh, no stmt_list. Rare, but we have to handle it. |
| We can do various things here like create one group per TU or |
| spread them over multiple groups to split up the expansion work. |
| To avoid worst case scenarios (too many groups or too large groups) |
| we, umm, group them in bunches. */ |
| line_offset = (NO_STMT_LIST_TYPE_UNIT_PSYMTAB |
| | (tu_stats->nr_stmt_less_type_units |
| / NO_STMT_LIST_TYPE_UNIT_PSYMTAB_SIZE)); |
| ++tu_stats->nr_stmt_less_type_units; |
| } |
| |
| type_unit_group_for_lookup.hash.dwo_unit = cu->dwo_unit; |
| type_unit_group_for_lookup.hash.line_offset.sect_off = line_offset; |
| slot = htab_find_slot (dwarf2_per_objfile->type_unit_groups, |
| &type_unit_group_for_lookup, INSERT); |
| if (*slot != NULL) |
| { |
| tu_group = (struct type_unit_group *) *slot; |
| gdb_assert (tu_group != NULL); |
| } |
| else |
| { |
| sect_offset line_offset_struct; |
| |
| line_offset_struct.sect_off = line_offset; |
| tu_group = create_type_unit_group (cu, line_offset_struct); |
| *slot = tu_group; |
| ++tu_stats->nr_symtabs; |
| } |
| |
| return tu_group; |
| } |
| |
| /* Partial symbol tables. */ |
| |
| /* Create a psymtab named NAME and assign it to PER_CU. |
| |
| The caller must fill in the following details: |
| dirname, textlow, texthigh. */ |
| |
| static struct partial_symtab * |
| create_partial_symtab (struct dwarf2_per_cu_data *per_cu, const char *name) |
| { |
| struct objfile *objfile = per_cu->objfile; |
| struct partial_symtab *pst; |
| |
| pst = start_psymtab_common (objfile, name, 0, |
| objfile->global_psymbols.next, |
| objfile->static_psymbols.next); |
| |
| pst->psymtabs_addrmap_supported = 1; |
| |
| /* This is the glue that links PST into GDB's symbol API. */ |
| pst->read_symtab_private = per_cu; |
| pst->read_symtab = dwarf2_read_symtab; |
| per_cu->v.psymtab = pst; |
| |
| return pst; |
| } |
| |
| /* The DATA object passed to process_psymtab_comp_unit_reader has this |
| type. */ |
| |
| struct process_psymtab_comp_unit_data |
| { |
| /* True if we are reading a DW_TAG_partial_unit. */ |
| |
| int want_partial_unit; |
| |
| /* The "pretend" language that is used if the CU doesn't declare a |
| language. */ |
| |
| enum language pretend_language; |
| }; |
| |
| /* die_reader_func for process_psymtab_comp_unit. */ |
| |
| static void |
| process_psymtab_comp_unit_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct dwarf2_per_cu_data *per_cu = cu->per_cu; |
| CORE_ADDR baseaddr; |
| CORE_ADDR best_lowpc = 0, best_highpc = 0; |
| struct partial_symtab *pst; |
| enum pc_bounds_kind cu_bounds_kind; |
| const char *filename; |
| struct process_psymtab_comp_unit_data *info |
| = (struct process_psymtab_comp_unit_data *) data; |
| |
| if (comp_unit_die->tag == DW_TAG_partial_unit && !info->want_partial_unit) |
| return; |
| |
| gdb_assert (! per_cu->is_debug_types); |
| |
| prepare_one_comp_unit (cu, comp_unit_die, info->pretend_language); |
| |
| cu->list_in_scope = &file_symbols; |
| |
| /* Allocate a new partial symbol table structure. */ |
| filename = dwarf2_string_attr (comp_unit_die, DW_AT_name, cu); |
| if (filename == NULL) |
| filename = ""; |
| |
| pst = create_partial_symtab (per_cu, filename); |
| |
| /* This must be done before calling dwarf2_build_include_psymtabs. */ |
| pst->dirname = dwarf2_string_attr (comp_unit_die, DW_AT_comp_dir, cu); |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| dwarf2_find_base_address (comp_unit_die, cu); |
| |
| /* Possibly set the default values of LOWPC and HIGHPC from |
| `DW_AT_ranges'. */ |
| cu_bounds_kind = dwarf2_get_pc_bounds (comp_unit_die, &best_lowpc, |
| &best_highpc, cu, pst); |
| if (cu_bounds_kind == PC_BOUNDS_HIGH_LOW && best_lowpc < best_highpc) |
| /* Store the contiguous range if it is not empty; it can be empty for |
| CUs with no code. */ |
| addrmap_set_empty (objfile->psymtabs_addrmap, |
| gdbarch_adjust_dwarf2_addr (gdbarch, |
| best_lowpc + baseaddr), |
| gdbarch_adjust_dwarf2_addr (gdbarch, |
| best_highpc + baseaddr) - 1, |
| pst); |
| |
| /* Check if comp unit has_children. |
| If so, read the rest of the partial symbols from this comp unit. |
| If not, there's no more debug_info for this comp unit. */ |
| if (has_children) |
| { |
| struct partial_die_info *first_die; |
| CORE_ADDR lowpc, highpc; |
| |
| lowpc = ((CORE_ADDR) -1); |
| highpc = ((CORE_ADDR) 0); |
| |
| first_die = load_partial_dies (reader, info_ptr, 1); |
| |
| scan_partial_symbols (first_die, &lowpc, &highpc, |
| cu_bounds_kind <= PC_BOUNDS_INVALID, cu); |
| |
| /* If we didn't find a lowpc, set it to highpc to avoid |
| complaints from `maint check'. */ |
| if (lowpc == ((CORE_ADDR) -1)) |
| lowpc = highpc; |
| |
| /* If the compilation unit didn't have an explicit address range, |
| then use the information extracted from its child dies. */ |
| if (cu_bounds_kind <= PC_BOUNDS_INVALID) |
| { |
| best_lowpc = lowpc; |
| best_highpc = highpc; |
| } |
| } |
| pst->textlow = gdbarch_adjust_dwarf2_addr (gdbarch, best_lowpc + baseaddr); |
| pst->texthigh = gdbarch_adjust_dwarf2_addr (gdbarch, best_highpc + baseaddr); |
| |
| end_psymtab_common (objfile, pst); |
| |
| if (!VEC_empty (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs)) |
| { |
| int i; |
| int len = VEC_length (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs); |
| struct dwarf2_per_cu_data *iter; |
| |
| /* Fill in 'dependencies' here; we fill in 'users' in a |
| post-pass. */ |
| pst->number_of_dependencies = len; |
| pst->dependencies = |
| XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len); |
| for (i = 0; |
| VEC_iterate (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs, |
| i, iter); |
| ++i) |
| pst->dependencies[i] = iter->v.psymtab; |
| |
| VEC_free (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs); |
| } |
| |
| /* Get the list of files included in the current compilation unit, |
| and build a psymtab for each of them. */ |
| dwarf2_build_include_psymtabs (cu, comp_unit_die, pst); |
| |
| if (dwarf_read_debug) |
| { |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| |
| fprintf_unfiltered (gdb_stdlog, |
| "Psymtab for %s unit @0x%x: %s - %s" |
| ", %d global, %d static syms\n", |
| per_cu->is_debug_types ? "type" : "comp", |
| per_cu->offset.sect_off, |
| paddress (gdbarch, pst->textlow), |
| paddress (gdbarch, pst->texthigh), |
| pst->n_global_syms, pst->n_static_syms); |
| } |
| } |
| |
| /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. |
| Process compilation unit THIS_CU for a psymtab. */ |
| |
| static void |
| process_psymtab_comp_unit (struct dwarf2_per_cu_data *this_cu, |
| int want_partial_unit, |
| enum language pretend_language) |
| { |
| struct process_psymtab_comp_unit_data info; |
| |
| /* If this compilation unit was already read in, free the |
| cached copy in order to read it in again. This is |
| necessary because we skipped some symbols when we first |
| read in the compilation unit (see load_partial_dies). |
| This problem could be avoided, but the benefit is unclear. */ |
| if (this_cu->cu != NULL) |
| free_one_cached_comp_unit (this_cu); |
| |
| gdb_assert (! this_cu->is_debug_types); |
| info.want_partial_unit = want_partial_unit; |
| info.pretend_language = pretend_language; |
| init_cutu_and_read_dies (this_cu, NULL, 0, 0, |
| process_psymtab_comp_unit_reader, |
| &info); |
| |
| /* Age out any secondary CUs. */ |
| age_cached_comp_units (); |
| } |
| |
| /* Reader function for build_type_psymtabs. */ |
| |
| static void |
| build_type_psymtabs_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *type_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_cu *cu = reader->cu; |
| struct dwarf2_per_cu_data *per_cu = cu->per_cu; |
| struct signatured_type *sig_type; |
| struct type_unit_group *tu_group; |
| struct attribute *attr; |
| struct partial_die_info *first_die; |
| CORE_ADDR lowpc, highpc; |
| struct partial_symtab *pst; |
| |
| gdb_assert (data == NULL); |
| gdb_assert (per_cu->is_debug_types); |
| sig_type = (struct signatured_type *) per_cu; |
| |
| if (! has_children) |
| return; |
| |
| attr = dwarf2_attr_no_follow (type_unit_die, DW_AT_stmt_list); |
| tu_group = get_type_unit_group (cu, attr); |
| |
| VEC_safe_push (sig_type_ptr, tu_group->tus, sig_type); |
| |
| prepare_one_comp_unit (cu, type_unit_die, language_minimal); |
| cu->list_in_scope = &file_symbols; |
| pst = create_partial_symtab (per_cu, ""); |
| pst->anonymous = 1; |
| |
| first_die = load_partial_dies (reader, info_ptr, 1); |
| |
| lowpc = (CORE_ADDR) -1; |
| highpc = (CORE_ADDR) 0; |
| scan_partial_symbols (first_die, &lowpc, &highpc, 0, cu); |
| |
| end_psymtab_common (objfile, pst); |
| } |
| |
| /* Struct used to sort TUs by their abbreviation table offset. */ |
| |
| struct tu_abbrev_offset |
| { |
| struct signatured_type *sig_type; |
| sect_offset abbrev_offset; |
| }; |
| |
| /* Helper routine for build_type_psymtabs_1, passed to qsort. */ |
| |
| static int |
| sort_tu_by_abbrev_offset (const void *ap, const void *bp) |
| { |
| const struct tu_abbrev_offset * const *a |
| = (const struct tu_abbrev_offset * const*) ap; |
| const struct tu_abbrev_offset * const *b |
| = (const struct tu_abbrev_offset * const*) bp; |
| unsigned int aoff = (*a)->abbrev_offset.sect_off; |
| unsigned int boff = (*b)->abbrev_offset.sect_off; |
| |
| return (aoff > boff) - (aoff < boff); |
| } |
| |
| /* Efficiently read all the type units. |
| This does the bulk of the work for build_type_psymtabs. |
| |
| The efficiency is because we sort TUs by the abbrev table they use and |
| only read each abbrev table once. In one program there are 200K TUs |
| sharing 8K abbrev tables. |
| |
| The main purpose of this function is to support building the |
| dwarf2_per_objfile->type_unit_groups table. |
| TUs typically share the DW_AT_stmt_list of the CU they came from, so we |
| can collapse the search space by grouping them by stmt_list. |
| The savings can be significant, in the same program from above the 200K TUs |
| share 8K stmt_list tables. |
| |
| FUNC is expected to call get_type_unit_group, which will create the |
| struct type_unit_group if necessary and add it to |
| dwarf2_per_objfile->type_unit_groups. */ |
| |
| static void |
| build_type_psymtabs_1 (void) |
| { |
| struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; |
| struct cleanup *cleanups; |
| struct abbrev_table *abbrev_table; |
| sect_offset abbrev_offset; |
| struct tu_abbrev_offset *sorted_by_abbrev; |
| int i; |
| |
| /* It's up to the caller to not call us multiple times. */ |
| gdb_assert (dwarf2_per_objfile->type_unit_groups == NULL); |
| |
| if (dwarf2_per_objfile->n_type_units == 0) |
| return; |
| |
| /* TUs typically share abbrev tables, and there can be way more TUs than |
| abbrev tables. Sort by abbrev table to reduce the number of times we |
| read each abbrev table in. |
| Alternatives are to punt or to maintain a cache of abbrev tables. |
| This is simpler and efficient enough for now. |
| |
| Later we group TUs by their DW_AT_stmt_list value (as this defines the |
| symtab to use). Typically TUs with the same abbrev offset have the same |
| stmt_list value too so in practice this should work well. |
| |
| The basic algorithm here is: |
| |
| sort TUs by abbrev table |
| for each TU with same abbrev table: |
| read abbrev table if first user |
| read TU top level DIE |
| [IWBN if DWO skeletons had DW_AT_stmt_list] |
| call FUNC */ |
| |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "Building type unit groups ...\n"); |
| |
| /* Sort in a separate table to maintain the order of all_type_units |
| for .gdb_index: TU indices directly index all_type_units. */ |
| sorted_by_abbrev = XNEWVEC (struct tu_abbrev_offset, |
| dwarf2_per_objfile->n_type_units); |
| for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i) |
| { |
| struct signatured_type *sig_type = dwarf2_per_objfile->all_type_units[i]; |
| |
| sorted_by_abbrev[i].sig_type = sig_type; |
| sorted_by_abbrev[i].abbrev_offset = |
| read_abbrev_offset (sig_type->per_cu.section, |
| sig_type->per_cu.offset); |
| } |
| cleanups = make_cleanup (xfree, sorted_by_abbrev); |
| qsort (sorted_by_abbrev, dwarf2_per_objfile->n_type_units, |
| sizeof (struct tu_abbrev_offset), sort_tu_by_abbrev_offset); |
| |
| abbrev_offset.sect_off = ~(unsigned) 0; |
| abbrev_table = NULL; |
| make_cleanup (abbrev_table_free_cleanup, &abbrev_table); |
| |
| for (i = 0; i < dwarf2_per_objfile->n_type_units; ++i) |
| { |
| const struct tu_abbrev_offset *tu = &sorted_by_abbrev[i]; |
| |
| /* Switch to the next abbrev table if necessary. */ |
| if (abbrev_table == NULL |
| || tu->abbrev_offset.sect_off != abbrev_offset.sect_off) |
| { |
| if (abbrev_table != NULL) |
| { |
| abbrev_table_free (abbrev_table); |
| /* Reset to NULL in case abbrev_table_read_table throws |
| an error: abbrev_table_free_cleanup will get called. */ |
| abbrev_table = NULL; |
| } |
| abbrev_offset = tu->abbrev_offset; |
| abbrev_table = |
| abbrev_table_read_table (&dwarf2_per_objfile->abbrev, |
| abbrev_offset); |
| ++tu_stats->nr_uniq_abbrev_tables; |
| } |
| |
| init_cutu_and_read_dies (&tu->sig_type->per_cu, abbrev_table, 0, 0, |
| build_type_psymtabs_reader, NULL); |
| } |
| |
| do_cleanups (cleanups); |
| } |
| |
| /* Print collected type unit statistics. */ |
| |
| static void |
| print_tu_stats (void) |
| { |
| struct tu_stats *tu_stats = &dwarf2_per_objfile->tu_stats; |
| |
| fprintf_unfiltered (gdb_stdlog, "Type unit statistics:\n"); |
| fprintf_unfiltered (gdb_stdlog, " %d TUs\n", |
| dwarf2_per_objfile->n_type_units); |
| fprintf_unfiltered (gdb_stdlog, " %d uniq abbrev tables\n", |
| tu_stats->nr_uniq_abbrev_tables); |
| fprintf_unfiltered (gdb_stdlog, " %d symtabs from stmt_list entries\n", |
| tu_stats->nr_symtabs); |
| fprintf_unfiltered (gdb_stdlog, " %d symtab sharers\n", |
| tu_stats->nr_symtab_sharers); |
| fprintf_unfiltered (gdb_stdlog, " %d type units without a stmt_list\n", |
| tu_stats->nr_stmt_less_type_units); |
| fprintf_unfiltered (gdb_stdlog, " %d all_type_units reallocs\n", |
| tu_stats->nr_all_type_units_reallocs); |
| } |
| |
| /* Traversal function for build_type_psymtabs. */ |
| |
| static int |
| build_type_psymtab_dependencies (void **slot, void *info) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct type_unit_group *tu_group = (struct type_unit_group *) *slot; |
| struct dwarf2_per_cu_data *per_cu = &tu_group->per_cu; |
| struct partial_symtab *pst = per_cu->v.psymtab; |
| int len = VEC_length (sig_type_ptr, tu_group->tus); |
| struct signatured_type *iter; |
| int i; |
| |
| gdb_assert (len > 0); |
| gdb_assert (IS_TYPE_UNIT_GROUP (per_cu)); |
| |
| pst->number_of_dependencies = len; |
| pst->dependencies = |
| XOBNEWVEC (&objfile->objfile_obstack, struct partial_symtab *, len); |
| for (i = 0; |
| VEC_iterate (sig_type_ptr, tu_group->tus, i, iter); |
| ++i) |
| { |
| gdb_assert (iter->per_cu.is_debug_types); |
| pst->dependencies[i] = iter->per_cu.v.psymtab; |
| iter->type_unit_group = tu_group; |
| } |
| |
| VEC_free (sig_type_ptr, tu_group->tus); |
| |
| return 1; |
| } |
| |
| /* Subroutine of dwarf2_build_psymtabs_hard to simplify it. |
| Build partial symbol tables for the .debug_types comp-units. */ |
| |
| static void |
| build_type_psymtabs (struct objfile *objfile) |
| { |
| if (! create_all_type_units (objfile)) |
| return; |
| |
| build_type_psymtabs_1 (); |
| } |
| |
| /* Traversal function for process_skeletonless_type_unit. |
| Read a TU in a DWO file and build partial symbols for it. */ |
| |
| static int |
| process_skeletonless_type_unit (void **slot, void *info) |
| { |
| struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot; |
| struct objfile *objfile = (struct objfile *) info; |
| struct signatured_type find_entry, *entry; |
| |
| /* If this TU doesn't exist in the global table, add it and read it in. */ |
| |
| if (dwarf2_per_objfile->signatured_types == NULL) |
| { |
| dwarf2_per_objfile->signatured_types |
| = allocate_signatured_type_table (objfile); |
| } |
| |
| find_entry.signature = dwo_unit->signature; |
| slot = htab_find_slot (dwarf2_per_objfile->signatured_types, &find_entry, |
| INSERT); |
| /* If we've already seen this type there's nothing to do. What's happening |
| is we're doing our own version of comdat-folding here. */ |
| if (*slot != NULL) |
| return 1; |
| |
| /* This does the job that create_all_type_units would have done for |
| this TU. */ |
| entry = add_type_unit (dwo_unit->signature, slot); |
| fill_in_sig_entry_from_dwo_entry (objfile, entry, dwo_unit); |
| *slot = entry; |
| |
| /* This does the job that build_type_psymtabs_1 would have done. */ |
| init_cutu_and_read_dies (&entry->per_cu, NULL, 0, 0, |
| build_type_psymtabs_reader, NULL); |
| |
| return 1; |
| } |
| |
| /* Traversal function for process_skeletonless_type_units. */ |
| |
| static int |
| process_dwo_file_for_skeletonless_type_units (void **slot, void *info) |
| { |
| struct dwo_file *dwo_file = (struct dwo_file *) *slot; |
| |
| if (dwo_file->tus != NULL) |
| { |
| htab_traverse_noresize (dwo_file->tus, |
| process_skeletonless_type_unit, info); |
| } |
| |
| return 1; |
| } |
| |
| /* Scan all TUs of DWO files, verifying we've processed them. |
| This is needed in case a TU was emitted without its skeleton. |
| Note: This can't be done until we know what all the DWO files are. */ |
| |
| static void |
| process_skeletonless_type_units (struct objfile *objfile) |
| { |
| /* Skeletonless TUs in DWP files without .gdb_index is not supported yet. */ |
| if (get_dwp_file () == NULL |
| && dwarf2_per_objfile->dwo_files != NULL) |
| { |
| htab_traverse_noresize (dwarf2_per_objfile->dwo_files, |
| process_dwo_file_for_skeletonless_type_units, |
| objfile); |
| } |
| } |
| |
| /* A cleanup function that clears objfile's psymtabs_addrmap field. */ |
| |
| static void |
| psymtabs_addrmap_cleanup (void *o) |
| { |
| struct objfile *objfile = (struct objfile *) o; |
| |
| objfile->psymtabs_addrmap = NULL; |
| } |
| |
| /* Compute the 'user' field for each psymtab in OBJFILE. */ |
| |
| static void |
| set_partial_user (struct objfile *objfile) |
| { |
| int i; |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| struct partial_symtab *pst = per_cu->v.psymtab; |
| int j; |
| |
| if (pst == NULL) |
| continue; |
| |
| for (j = 0; j < pst->number_of_dependencies; ++j) |
| { |
| /* Set the 'user' field only if it is not already set. */ |
| if (pst->dependencies[j]->user == NULL) |
| pst->dependencies[j]->user = pst; |
| } |
| } |
| } |
| |
| /* Build the partial symbol table by doing a quick pass through the |
| .debug_info and .debug_abbrev sections. */ |
| |
| static void |
| dwarf2_build_psymtabs_hard (struct objfile *objfile) |
| { |
| struct cleanup *back_to, *addrmap_cleanup; |
| struct obstack temp_obstack; |
| int i; |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Building psymtabs of objfile %s ...\n", |
| objfile_name (objfile)); |
| } |
| |
| dwarf2_per_objfile->reading_partial_symbols = 1; |
| |
| dwarf2_read_section (objfile, &dwarf2_per_objfile->info); |
| |
| /* Any cached compilation units will be linked by the per-objfile |
| read_in_chain. Make sure to free them when we're done. */ |
| back_to = make_cleanup (free_cached_comp_units, NULL); |
| |
| build_type_psymtabs (objfile); |
| |
| create_all_comp_units (objfile); |
| |
| /* Create a temporary address map on a temporary obstack. We later |
| copy this to the final obstack. */ |
| obstack_init (&temp_obstack); |
| make_cleanup_obstack_free (&temp_obstack); |
| objfile->psymtabs_addrmap = addrmap_create_mutable (&temp_obstack); |
| addrmap_cleanup = make_cleanup (psymtabs_addrmap_cleanup, objfile); |
| |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu = dw2_get_cutu (i); |
| |
| process_psymtab_comp_unit (per_cu, 0, language_minimal); |
| } |
| |
| /* This has to wait until we read the CUs, we need the list of DWOs. */ |
| process_skeletonless_type_units (objfile); |
| |
| /* Now that all TUs have been processed we can fill in the dependencies. */ |
| if (dwarf2_per_objfile->type_unit_groups != NULL) |
| { |
| htab_traverse_noresize (dwarf2_per_objfile->type_unit_groups, |
| build_type_psymtab_dependencies, NULL); |
| } |
| |
| if (dwarf_read_debug) |
| print_tu_stats (); |
| |
| set_partial_user (objfile); |
| |
| objfile->psymtabs_addrmap = addrmap_create_fixed (objfile->psymtabs_addrmap, |
| &objfile->objfile_obstack); |
| discard_cleanups (addrmap_cleanup); |
| |
| do_cleanups (back_to); |
| |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "Done building psymtabs of %s\n", |
| objfile_name (objfile)); |
| } |
| |
| /* die_reader_func for load_partial_comp_unit. */ |
| |
| static void |
| load_partial_comp_unit_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| |
| prepare_one_comp_unit (cu, comp_unit_die, language_minimal); |
| |
| /* Check if comp unit has_children. |
| If so, read the rest of the partial symbols from this comp unit. |
| If not, there's no more debug_info for this comp unit. */ |
| if (has_children) |
| load_partial_dies (reader, info_ptr, 0); |
| } |
| |
| /* Load the partial DIEs for a secondary CU into memory. |
| This is also used when rereading a primary CU with load_all_dies. */ |
| |
| static void |
| load_partial_comp_unit (struct dwarf2_per_cu_data *this_cu) |
| { |
| init_cutu_and_read_dies (this_cu, NULL, 1, 1, |
| load_partial_comp_unit_reader, NULL); |
| } |
| |
| static void |
| read_comp_units_from_section (struct objfile *objfile, |
| struct dwarf2_section_info *section, |
| unsigned int is_dwz, |
| int *n_allocated, |
| int *n_comp_units, |
| struct dwarf2_per_cu_data ***all_comp_units) |
| { |
| const gdb_byte *info_ptr; |
| bfd *abfd = get_section_bfd_owner (section); |
| |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "Reading %s for %s\n", |
| get_section_name (section), |
| get_section_file_name (section)); |
| |
| dwarf2_read_section (objfile, section); |
| |
| info_ptr = section->buffer; |
| |
| while (info_ptr < section->buffer + section->size) |
| { |
| unsigned int length, initial_length_size; |
| struct dwarf2_per_cu_data *this_cu; |
| sect_offset offset; |
| |
| offset.sect_off = info_ptr - section->buffer; |
| |
| /* Read just enough information to find out where the next |
| compilation unit is. */ |
| length = read_initial_length (abfd, info_ptr, &initial_length_size); |
| |
| /* Save the compilation unit for later lookup. */ |
| this_cu = XOBNEW (&objfile->objfile_obstack, struct dwarf2_per_cu_data); |
| memset (this_cu, 0, sizeof (*this_cu)); |
| this_cu->offset = offset; |
| this_cu->length = length + initial_length_size; |
| this_cu->is_dwz = is_dwz; |
| this_cu->objfile = objfile; |
| this_cu->section = section; |
| |
| if (*n_comp_units == *n_allocated) |
| { |
| *n_allocated *= 2; |
| *all_comp_units = XRESIZEVEC (struct dwarf2_per_cu_data *, |
| *all_comp_units, *n_allocated); |
| } |
| (*all_comp_units)[*n_comp_units] = this_cu; |
| ++*n_comp_units; |
| |
| info_ptr = info_ptr + this_cu->length; |
| } |
| } |
| |
| /* Create a list of all compilation units in OBJFILE. |
| This is only done for -readnow and building partial symtabs. */ |
| |
| static void |
| create_all_comp_units (struct objfile *objfile) |
| { |
| int n_allocated; |
| int n_comp_units; |
| struct dwarf2_per_cu_data **all_comp_units; |
| struct dwz_file *dwz; |
| |
| n_comp_units = 0; |
| n_allocated = 10; |
| all_comp_units = XNEWVEC (struct dwarf2_per_cu_data *, n_allocated); |
| |
| read_comp_units_from_section (objfile, &dwarf2_per_objfile->info, 0, |
| &n_allocated, &n_comp_units, &all_comp_units); |
| |
| dwz = dwarf2_get_dwz_file (); |
| if (dwz != NULL) |
| read_comp_units_from_section (objfile, &dwz->info, 1, |
| &n_allocated, &n_comp_units, |
| &all_comp_units); |
| |
| dwarf2_per_objfile->all_comp_units = XOBNEWVEC (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_data *, |
| n_comp_units); |
| memcpy (dwarf2_per_objfile->all_comp_units, all_comp_units, |
| n_comp_units * sizeof (struct dwarf2_per_cu_data *)); |
| xfree (all_comp_units); |
| dwarf2_per_objfile->n_comp_units = n_comp_units; |
| } |
| |
| /* Process all loaded DIEs for compilation unit CU, starting at |
| FIRST_DIE. The caller should pass SET_ADDRMAP == 1 if the compilation |
| unit DIE did not have PC info (DW_AT_low_pc and DW_AT_high_pc, or |
| DW_AT_ranges). See the comments of add_partial_subprogram on how |
| SET_ADDRMAP is used and how *LOWPC and *HIGHPC are updated. */ |
| |
| static void |
| scan_partial_symbols (struct partial_die_info *first_die, CORE_ADDR *lowpc, |
| CORE_ADDR *highpc, int set_addrmap, |
| struct dwarf2_cu *cu) |
| { |
| struct partial_die_info *pdi; |
| |
| /* Now, march along the PDI's, descending into ones which have |
| interesting children but skipping the children of the other ones, |
| until we reach the end of the compilation unit. */ |
| |
| pdi = first_die; |
| |
| while (pdi != NULL) |
| { |
| fixup_partial_die (pdi, cu); |
| |
| /* Anonymous namespaces or modules have no name but have interesting |
| children, so we need to look at them. Ditto for anonymous |
| enums. */ |
| |
| if (pdi->name != NULL || pdi->tag == DW_TAG_namespace |
| || pdi->tag == DW_TAG_module || pdi->tag == DW_TAG_enumeration_type |
| || pdi->tag == DW_TAG_imported_unit) |
| { |
| switch (pdi->tag) |
| { |
| case DW_TAG_subprogram: |
| add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu); |
| break; |
| case DW_TAG_constant: |
| case DW_TAG_variable: |
| case DW_TAG_typedef: |
| case DW_TAG_union_type: |
| if (!pdi->is_declaration) |
| { |
| add_partial_symbol (pdi, cu); |
| } |
| break; |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| if (!pdi->is_declaration) |
| { |
| add_partial_symbol (pdi, cu); |
| } |
| if (cu->language == language_rust && pdi->has_children) |
| scan_partial_symbols (pdi->die_child, lowpc, highpc, |
| set_addrmap, cu); |
| break; |
| case DW_TAG_enumeration_type: |
| if (!pdi->is_declaration) |
| add_partial_enumeration (pdi, cu); |
| break; |
| case DW_TAG_base_type: |
| case DW_TAG_subrange_type: |
| /* File scope base type definitions are added to the partial |
| symbol table. */ |
| add_partial_symbol (pdi, cu); |
| break; |
| case DW_TAG_namespace: |
| add_partial_namespace (pdi, lowpc, highpc, set_addrmap, cu); |
| break; |
| case DW_TAG_module: |
| add_partial_module (pdi, lowpc, highpc, set_addrmap, cu); |
| break; |
| case DW_TAG_imported_unit: |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| |
| /* For now we don't handle imported units in type units. */ |
| if (cu->per_cu->is_debug_types) |
| { |
| error (_("Dwarf Error: DW_TAG_imported_unit is not" |
| " supported in type units [in module %s]"), |
| objfile_name (cu->objfile)); |
| } |
| |
| per_cu = dwarf2_find_containing_comp_unit (pdi->d.offset, |
| pdi->is_dwz, |
| cu->objfile); |
| |
| /* Go read the partial unit, if needed. */ |
| if (per_cu->v.psymtab == NULL) |
| process_psymtab_comp_unit (per_cu, 1, cu->language); |
| |
| VEC_safe_push (dwarf2_per_cu_ptr, |
| cu->per_cu->imported_symtabs, per_cu); |
| } |
| break; |
| case DW_TAG_imported_declaration: |
| add_partial_symbol (pdi, cu); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /* If the die has a sibling, skip to the sibling. */ |
| |
| pdi = pdi->die_sibling; |
| } |
| } |
| |
| /* Functions used to compute the fully scoped name of a partial DIE. |
| |
| Normally, this is simple. For C++, the parent DIE's fully scoped |
| name is concatenated with "::" and the partial DIE's name. |
| Enumerators are an exception; they use the scope of their parent |
| enumeration type, i.e. the name of the enumeration type is not |
| prepended to the enumerator. |
| |
| There are two complexities. One is DW_AT_specification; in this |
| case "parent" means the parent of the target of the specification, |
| instead of the direct parent of the DIE. The other is compilers |
| which do not emit DW_TAG_namespace; in this case we try to guess |
| the fully qualified name of structure types from their members' |
| linkage names. This must be done using the DIE's children rather |
| than the children of any DW_AT_specification target. We only need |
| to do this for structures at the top level, i.e. if the target of |
| any DW_AT_specification (if any; otherwise the DIE itself) does not |
| have a parent. */ |
| |
| /* Compute the scope prefix associated with PDI's parent, in |
| compilation unit CU. The result will be allocated on CU's |
| comp_unit_obstack, or a copy of the already allocated PDI->NAME |
| field. NULL is returned if no prefix is necessary. */ |
| static const char * |
| partial_die_parent_scope (struct partial_die_info *pdi, |
| struct dwarf2_cu *cu) |
| { |
| const char *grandparent_scope; |
| struct partial_die_info *parent, *real_pdi; |
| |
| /* We need to look at our parent DIE; if we have a DW_AT_specification, |
| then this means the parent of the specification DIE. */ |
| |
| real_pdi = pdi; |
| while (real_pdi->has_specification) |
| real_pdi = find_partial_die (real_pdi->spec_offset, |
| real_pdi->spec_is_dwz, cu); |
| |
| parent = real_pdi->die_parent; |
| if (parent == NULL) |
| return NULL; |
| |
| if (parent->scope_set) |
| return parent->scope; |
| |
| fixup_partial_die (parent, cu); |
| |
| grandparent_scope = partial_die_parent_scope (parent, cu); |
| |
| /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus |
| DW_TAG_namespace DIEs with a name of "::" for the global namespace. |
| Work around this problem here. */ |
| if (cu->language == language_cplus |
| && parent->tag == DW_TAG_namespace |
| && strcmp (parent->name, "::") == 0 |
| && grandparent_scope == NULL) |
| { |
| parent->scope = NULL; |
| parent->scope_set = 1; |
| return NULL; |
| } |
| |
| if (pdi->tag == DW_TAG_enumerator) |
| /* Enumerators should not get the name of the enumeration as a prefix. */ |
| parent->scope = grandparent_scope; |
| else if (parent->tag == DW_TAG_namespace |
| || parent->tag == DW_TAG_module |
| || parent->tag == DW_TAG_structure_type |
| || parent->tag == DW_TAG_class_type |
| || parent->tag == DW_TAG_interface_type |
| || parent->tag == DW_TAG_union_type |
| || parent->tag == DW_TAG_enumeration_type) |
| { |
| if (grandparent_scope == NULL) |
| parent->scope = parent->name; |
| else |
| parent->scope = typename_concat (&cu->comp_unit_obstack, |
| grandparent_scope, |
| parent->name, 0, cu); |
| } |
| else |
| { |
| /* FIXME drow/2004-04-01: What should we be doing with |
| function-local names? For partial symbols, we should probably be |
| ignoring them. */ |
| complaint (&symfile_complaints, |
| _("unhandled containing DIE tag %d for DIE at %d"), |
| parent->tag, pdi->offset.sect_off); |
| parent->scope = grandparent_scope; |
| } |
| |
| parent->scope_set = 1; |
| return parent->scope; |
| } |
| |
| /* Return the fully scoped name associated with PDI, from compilation unit |
| CU. The result will be allocated with malloc. */ |
| |
| static char * |
| partial_die_full_name (struct partial_die_info *pdi, |
| struct dwarf2_cu *cu) |
| { |
| const char *parent_scope; |
| |
| /* If this is a template instantiation, we can not work out the |
| template arguments from partial DIEs. So, unfortunately, we have |
| to go through the full DIEs. At least any work we do building |
| types here will be reused if full symbols are loaded later. */ |
| if (pdi->has_template_arguments) |
| { |
| fixup_partial_die (pdi, cu); |
| |
| if (pdi->name != NULL && strchr (pdi->name, '<') == NULL) |
| { |
| struct die_info *die; |
| struct attribute attr; |
| struct dwarf2_cu *ref_cu = cu; |
| |
| /* DW_FORM_ref_addr is using section offset. */ |
| attr.name = (enum dwarf_attribute) 0; |
| attr.form = DW_FORM_ref_addr; |
| attr.u.unsnd = pdi->offset.sect_off; |
| die = follow_die_ref (NULL, &attr, &ref_cu); |
| |
| return xstrdup (dwarf2_full_name (NULL, die, ref_cu)); |
| } |
| } |
| |
| parent_scope = partial_die_parent_scope (pdi, cu); |
| if (parent_scope == NULL) |
| return NULL; |
| else |
| return typename_concat (NULL, parent_scope, pdi->name, 0, cu); |
| } |
| |
| static void |
| add_partial_symbol (struct partial_die_info *pdi, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| CORE_ADDR addr = 0; |
| const char *actual_name = NULL; |
| CORE_ADDR baseaddr; |
| char *built_actual_name; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| built_actual_name = partial_die_full_name (pdi, cu); |
| if (built_actual_name != NULL) |
| actual_name = built_actual_name; |
| |
| if (actual_name == NULL) |
| actual_name = pdi->name; |
| |
| switch (pdi->tag) |
| { |
| case DW_TAG_subprogram: |
| addr = gdbarch_adjust_dwarf2_addr (gdbarch, pdi->lowpc + baseaddr); |
| if (pdi->is_external || cu->language == language_ada) |
| { |
| /* brobecker/2007-12-26: Normally, only "external" DIEs are part |
| of the global scope. But in Ada, we want to be able to access |
| nested procedures globally. So all Ada subprograms are stored |
| in the global scope. */ |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_BLOCK, |
| &objfile->global_psymbols, |
| addr, cu->language, objfile); |
| } |
| else |
| { |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_BLOCK, |
| &objfile->static_psymbols, |
| addr, cu->language, objfile); |
| } |
| break; |
| case DW_TAG_constant: |
| { |
| struct psymbol_allocation_list *list; |
| |
| if (pdi->is_external) |
| list = &objfile->global_psymbols; |
| else |
| list = &objfile->static_psymbols; |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, VAR_DOMAIN, LOC_STATIC, |
| list, 0, cu->language, objfile); |
| } |
| break; |
| case DW_TAG_variable: |
| if (pdi->d.locdesc) |
| addr = decode_locdesc (pdi->d.locdesc, cu); |
| |
| if (pdi->d.locdesc |
| && addr == 0 |
| && !dwarf2_per_objfile->has_section_at_zero) |
| { |
| /* A global or static variable may also have been stripped |
| out by the linker if unused, in which case its address |
| will be nullified; do not add such variables into partial |
| symbol table then. */ |
| } |
| else if (pdi->is_external) |
| { |
| /* Global Variable. |
| Don't enter into the minimal symbol tables as there is |
| a minimal symbol table entry from the ELF symbols already. |
| Enter into partial symbol table if it has a location |
| descriptor or a type. |
| If the location descriptor is missing, new_symbol will create |
| a LOC_UNRESOLVED symbol, the address of the variable will then |
| be determined from the minimal symbol table whenever the variable |
| is referenced. |
| The address for the partial symbol table entry is not |
| used by GDB, but it comes in handy for debugging partial symbol |
| table building. */ |
| |
| if (pdi->d.locdesc || pdi->has_type) |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_STATIC, |
| &objfile->global_psymbols, |
| addr + baseaddr, |
| cu->language, objfile); |
| } |
| else |
| { |
| int has_loc = pdi->d.locdesc != NULL; |
| |
| /* Static Variable. Skip symbols whose value we cannot know (those |
| without location descriptors or constant values). */ |
| if (!has_loc && !pdi->has_const_value) |
| { |
| xfree (built_actual_name); |
| return; |
| } |
| |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_STATIC, |
| &objfile->static_psymbols, |
| has_loc ? addr + baseaddr : (CORE_ADDR) 0, |
| cu->language, objfile); |
| } |
| break; |
| case DW_TAG_typedef: |
| case DW_TAG_base_type: |
| case DW_TAG_subrange_type: |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_TYPEDEF, |
| &objfile->static_psymbols, |
| 0, cu->language, objfile); |
| break; |
| case DW_TAG_imported_declaration: |
| case DW_TAG_namespace: |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_TYPEDEF, |
| &objfile->global_psymbols, |
| 0, cu->language, objfile); |
| break; |
| case DW_TAG_module: |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| MODULE_DOMAIN, LOC_TYPEDEF, |
| &objfile->global_psymbols, |
| 0, cu->language, objfile); |
| break; |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| case DW_TAG_enumeration_type: |
| /* Skip external references. The DWARF standard says in the section |
| about "Structure, Union, and Class Type Entries": "An incomplete |
| structure, union or class type is represented by a structure, |
| union or class entry that does not have a byte size attribute |
| and that has a DW_AT_declaration attribute." */ |
| if (!pdi->has_byte_size && pdi->is_declaration) |
| { |
| xfree (built_actual_name); |
| return; |
| } |
| |
| /* NOTE: carlton/2003-10-07: See comment in new_symbol about |
| static vs. global. */ |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| STRUCT_DOMAIN, LOC_TYPEDEF, |
| cu->language == language_cplus |
| ? &objfile->global_psymbols |
| : &objfile->static_psymbols, |
| 0, cu->language, objfile); |
| |
| break; |
| case DW_TAG_enumerator: |
| add_psymbol_to_list (actual_name, strlen (actual_name), |
| built_actual_name != NULL, |
| VAR_DOMAIN, LOC_CONST, |
| cu->language == language_cplus |
| ? &objfile->global_psymbols |
| : &objfile->static_psymbols, |
| 0, cu->language, objfile); |
| break; |
| default: |
| break; |
| } |
| |
| xfree (built_actual_name); |
| } |
| |
| /* Read a partial die corresponding to a namespace; also, add a symbol |
| corresponding to that namespace to the symbol table. NAMESPACE is |
| the name of the enclosing namespace. */ |
| |
| static void |
| add_partial_namespace (struct partial_die_info *pdi, |
| CORE_ADDR *lowpc, CORE_ADDR *highpc, |
| int set_addrmap, struct dwarf2_cu *cu) |
| { |
| /* Add a symbol for the namespace. */ |
| |
| add_partial_symbol (pdi, cu); |
| |
| /* Now scan partial symbols in that namespace. */ |
| |
| if (pdi->has_children) |
| scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu); |
| } |
| |
| /* Read a partial die corresponding to a Fortran module. */ |
| |
| static void |
| add_partial_module (struct partial_die_info *pdi, CORE_ADDR *lowpc, |
| CORE_ADDR *highpc, int set_addrmap, struct dwarf2_cu *cu) |
| { |
| /* Add a symbol for the namespace. */ |
| |
| add_partial_symbol (pdi, cu); |
| |
| /* Now scan partial symbols in that module. */ |
| |
| if (pdi->has_children) |
| scan_partial_symbols (pdi->die_child, lowpc, highpc, set_addrmap, cu); |
| } |
| |
| /* Read a partial die corresponding to a subprogram and create a partial |
| symbol for that subprogram. When the CU language allows it, this |
| routine also defines a partial symbol for each nested subprogram |
| that this subprogram contains. If SET_ADDRMAP is true, record the |
| covered ranges in the addrmap. Set *LOWPC and *HIGHPC to the lowest |
| and highest PC values found in PDI. |
| |
| PDI may also be a lexical block, in which case we simply search |
| recursively for subprograms defined inside that lexical block. |
| Again, this is only performed when the CU language allows this |
| type of definitions. */ |
| |
| static void |
| add_partial_subprogram (struct partial_die_info *pdi, |
| CORE_ADDR *lowpc, CORE_ADDR *highpc, |
| int set_addrmap, struct dwarf2_cu *cu) |
| { |
| if (pdi->tag == DW_TAG_subprogram) |
| { |
| if (pdi->has_pc_info) |
| { |
| if (pdi->lowpc < *lowpc) |
| *lowpc = pdi->lowpc; |
| if (pdi->highpc > *highpc) |
| *highpc = pdi->highpc; |
| if (set_addrmap) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| CORE_ADDR baseaddr; |
| CORE_ADDR highpc; |
| CORE_ADDR lowpc; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, |
| SECT_OFF_TEXT (objfile)); |
| lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, |
| pdi->lowpc + baseaddr); |
| highpc = gdbarch_adjust_dwarf2_addr (gdbarch, |
| pdi->highpc + baseaddr); |
| addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1, |
| cu->per_cu->v.psymtab); |
| } |
| } |
| |
| if (pdi->has_pc_info || (!pdi->is_external && pdi->may_be_inlined)) |
| { |
| if (!pdi->is_declaration) |
| /* Ignore subprogram DIEs that do not have a name, they are |
| illegal. Do not emit a complaint at this point, we will |
| do so when we convert this psymtab into a symtab. */ |
| if (pdi->name) |
| add_partial_symbol (pdi, cu); |
| } |
| } |
| |
| if (! pdi->has_children) |
| return; |
| |
| if (cu->language == language_ada) |
| { |
| pdi = pdi->die_child; |
| while (pdi != NULL) |
| { |
| fixup_partial_die (pdi, cu); |
| if (pdi->tag == DW_TAG_subprogram |
| || pdi->tag == DW_TAG_lexical_block) |
| add_partial_subprogram (pdi, lowpc, highpc, set_addrmap, cu); |
| pdi = pdi->die_sibling; |
| } |
| } |
| } |
| |
| /* Read a partial die corresponding to an enumeration type. */ |
| |
| static void |
| add_partial_enumeration (struct partial_die_info *enum_pdi, |
| struct dwarf2_cu *cu) |
| { |
| struct partial_die_info *pdi; |
| |
| if (enum_pdi->name != NULL) |
| add_partial_symbol (enum_pdi, cu); |
| |
| pdi = enum_pdi->die_child; |
| while (pdi) |
| { |
| if (pdi->tag != DW_TAG_enumerator || pdi->name == NULL) |
| complaint (&symfile_complaints, _("malformed enumerator DIE ignored")); |
| else |
| add_partial_symbol (pdi, cu); |
| pdi = pdi->die_sibling; |
| } |
| } |
| |
| /* Return the initial uleb128 in the die at INFO_PTR. */ |
| |
| static unsigned int |
| peek_abbrev_code (bfd *abfd, const gdb_byte *info_ptr) |
| { |
| unsigned int bytes_read; |
| |
| return read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| } |
| |
| /* Read the initial uleb128 in the die at INFO_PTR in compilation unit CU. |
| Return the corresponding abbrev, or NULL if the number is zero (indicating |
| an empty DIE). In either case *BYTES_READ will be set to the length of |
| the initial number. */ |
| |
| static struct abbrev_info * |
| peek_die_abbrev (const gdb_byte *info_ptr, unsigned int *bytes_read, |
| struct dwarf2_cu *cu) |
| { |
| bfd *abfd = cu->objfile->obfd; |
| unsigned int abbrev_number; |
| struct abbrev_info *abbrev; |
| |
| abbrev_number = read_unsigned_leb128 (abfd, info_ptr, bytes_read); |
| |
| if (abbrev_number == 0) |
| return NULL; |
| |
| abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number); |
| if (!abbrev) |
| { |
| error (_("Dwarf Error: Could not find abbrev number %d in %s" |
| " at offset 0x%x [in module %s]"), |
| abbrev_number, cu->per_cu->is_debug_types ? "TU" : "CU", |
| cu->header.offset.sect_off, bfd_get_filename (abfd)); |
| } |
| |
| return abbrev; |
| } |
| |
| /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. |
| Returns a pointer to the end of a series of DIEs, terminated by an empty |
| DIE. Any children of the skipped DIEs will also be skipped. */ |
| |
| static const gdb_byte * |
| skip_children (const struct die_reader_specs *reader, const gdb_byte *info_ptr) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct abbrev_info *abbrev; |
| unsigned int bytes_read; |
| |
| while (1) |
| { |
| abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu); |
| if (abbrev == NULL) |
| return info_ptr + bytes_read; |
| else |
| info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); |
| } |
| } |
| |
| /* Scan the debug information for CU starting at INFO_PTR in buffer BUFFER. |
| INFO_PTR should point just after the initial uleb128 of a DIE, and the |
| abbrev corresponding to that skipped uleb128 should be passed in |
| ABBREV. Returns a pointer to this DIE's sibling, skipping any |
| children. */ |
| |
| static const gdb_byte * |
| skip_one_die (const struct die_reader_specs *reader, const gdb_byte *info_ptr, |
| struct abbrev_info *abbrev) |
| { |
| unsigned int bytes_read; |
| struct attribute attr; |
| bfd *abfd = reader->abfd; |
| struct dwarf2_cu *cu = reader->cu; |
| const gdb_byte *buffer = reader->buffer; |
| const gdb_byte *buffer_end = reader->buffer_end; |
| unsigned int form, i; |
| |
| for (i = 0; i < abbrev->num_attrs; i++) |
| { |
| /* The only abbrev we care about is DW_AT_sibling. */ |
| if (abbrev->attrs[i].name == DW_AT_sibling) |
| { |
| read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr); |
| if (attr.form == DW_FORM_ref_addr) |
| complaint (&symfile_complaints, |
| _("ignoring absolute DW_AT_sibling")); |
| else |
| { |
| unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off; |
| const gdb_byte *sibling_ptr = buffer + off; |
| |
| if (sibling_ptr < info_ptr) |
| complaint (&symfile_complaints, |
| _("DW_AT_sibling points backwards")); |
| else if (sibling_ptr > reader->buffer_end) |
| dwarf2_section_buffer_overflow_complaint (reader->die_section); |
| else |
| return sibling_ptr; |
| } |
| } |
| |
| /* If it isn't DW_AT_sibling, skip this attribute. */ |
| form = abbrev->attrs[i].form; |
| skip_attribute: |
| switch (form) |
| { |
| case DW_FORM_ref_addr: |
| /* In DWARF 2, DW_FORM_ref_addr is address sized; in DWARF 3 |
| and later it is offset sized. */ |
| if (cu->header.version == 2) |
| info_ptr += cu->header.addr_size; |
| else |
| info_ptr += cu->header.offset_size; |
| break; |
| case DW_FORM_GNU_ref_alt: |
| info_ptr += cu->header.offset_size; |
| break; |
| case DW_FORM_addr: |
| info_ptr += cu->header.addr_size; |
| break; |
| case DW_FORM_data1: |
| case DW_FORM_ref1: |
| case DW_FORM_flag: |
| info_ptr += 1; |
| break; |
| case DW_FORM_flag_present: |
| break; |
| case DW_FORM_data2: |
| case DW_FORM_ref2: |
| info_ptr += 2; |
| break; |
| case DW_FORM_data4: |
| case DW_FORM_ref4: |
| info_ptr += 4; |
| break; |
| case DW_FORM_data8: |
| case DW_FORM_ref8: |
| case DW_FORM_ref_sig8: |
| info_ptr += 8; |
| break; |
| case DW_FORM_string: |
| read_direct_string (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_sec_offset: |
| case DW_FORM_strp: |
| case DW_FORM_GNU_strp_alt: |
| info_ptr += cu->header.offset_size; |
| break; |
| case DW_FORM_exprloc: |
| case DW_FORM_block: |
| info_ptr += read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_block1: |
| info_ptr += 1 + read_1_byte (abfd, info_ptr); |
| break; |
| case DW_FORM_block2: |
| info_ptr += 2 + read_2_bytes (abfd, info_ptr); |
| break; |
| case DW_FORM_block4: |
| info_ptr += 4 + read_4_bytes (abfd, info_ptr); |
| break; |
| case DW_FORM_sdata: |
| case DW_FORM_udata: |
| case DW_FORM_ref_udata: |
| case DW_FORM_GNU_addr_index: |
| case DW_FORM_GNU_str_index: |
| info_ptr = safe_skip_leb128 (info_ptr, buffer_end); |
| break; |
| case DW_FORM_indirect: |
| form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| /* We need to continue parsing from here, so just go back to |
| the top. */ |
| goto skip_attribute; |
| |
| default: |
| error (_("Dwarf Error: Cannot handle %s " |
| "in DWARF reader [in module %s]"), |
| dwarf_form_name (form), |
| bfd_get_filename (abfd)); |
| } |
| } |
| |
| if (abbrev->has_children) |
| return skip_children (reader, info_ptr); |
| else |
| return info_ptr; |
| } |
| |
| /* Locate ORIG_PDI's sibling. |
| INFO_PTR should point to the start of the next DIE after ORIG_PDI. */ |
| |
| static const gdb_byte * |
| locate_pdi_sibling (const struct die_reader_specs *reader, |
| struct partial_die_info *orig_pdi, |
| const gdb_byte *info_ptr) |
| { |
| /* Do we know the sibling already? */ |
| |
| if (orig_pdi->sibling) |
| return orig_pdi->sibling; |
| |
| /* Are there any children to deal with? */ |
| |
| if (!orig_pdi->has_children) |
| return info_ptr; |
| |
| /* Skip the children the long way. */ |
| |
| return skip_children (reader, info_ptr); |
| } |
| |
| /* Expand this partial symbol table into a full symbol table. SELF is |
| not NULL. */ |
| |
| static void |
| dwarf2_read_symtab (struct partial_symtab *self, |
| struct objfile *objfile) |
| { |
| if (self->readin) |
| { |
| warning (_("bug: psymtab for %s is already read in."), |
| self->filename); |
| } |
| else |
| { |
| if (info_verbose) |
| { |
| printf_filtered (_("Reading in symbols for %s..."), |
| self->filename); |
| gdb_flush (gdb_stdout); |
| } |
| |
| /* Restore our global data. */ |
| dwarf2_per_objfile |
| = (struct dwarf2_per_objfile *) objfile_data (objfile, |
| dwarf2_objfile_data_key); |
| |
| /* If this psymtab is constructed from a debug-only objfile, the |
| has_section_at_zero flag will not necessarily be correct. We |
| can get the correct value for this flag by looking at the data |
| associated with the (presumably stripped) associated objfile. */ |
| if (objfile->separate_debug_objfile_backlink) |
| { |
| struct dwarf2_per_objfile *dpo_backlink |
| = ((struct dwarf2_per_objfile *) |
| objfile_data (objfile->separate_debug_objfile_backlink, |
| dwarf2_objfile_data_key)); |
| |
| dwarf2_per_objfile->has_section_at_zero |
| = dpo_backlink->has_section_at_zero; |
| } |
| |
| dwarf2_per_objfile->reading_partial_symbols = 0; |
| |
| psymtab_to_symtab_1 (self); |
| |
| /* Finish up the debug error message. */ |
| if (info_verbose) |
| printf_filtered (_("done.\n")); |
| } |
| |
| process_cu_includes (); |
| } |
| |
| /* Reading in full CUs. */ |
| |
| /* Add PER_CU to the queue. */ |
| |
| static void |
| queue_comp_unit (struct dwarf2_per_cu_data *per_cu, |
| enum language pretend_language) |
| { |
| struct dwarf2_queue_item *item; |
| |
| per_cu->queued = 1; |
| item = XNEW (struct dwarf2_queue_item); |
| item->per_cu = per_cu; |
| item->pretend_language = pretend_language; |
| item->next = NULL; |
| |
| if (dwarf2_queue == NULL) |
| dwarf2_queue = item; |
| else |
| dwarf2_queue_tail->next = item; |
| |
| dwarf2_queue_tail = item; |
| } |
| |
| /* If PER_CU is not yet queued, add it to the queue. |
| If DEPENDENT_CU is non-NULL, it has a reference to PER_CU so add a |
| dependency. |
| The result is non-zero if PER_CU was queued, otherwise the result is zero |
| meaning either PER_CU is already queued or it is already loaded. |
| |
| N.B. There is an invariant here that if a CU is queued then it is loaded. |
| The caller is required to load PER_CU if we return non-zero. */ |
| |
| static int |
| maybe_queue_comp_unit (struct dwarf2_cu *dependent_cu, |
| struct dwarf2_per_cu_data *per_cu, |
| enum language pretend_language) |
| { |
| /* We may arrive here during partial symbol reading, if we need full |
| DIEs to process an unusual case (e.g. template arguments). Do |
| not queue PER_CU, just tell our caller to load its DIEs. */ |
| if (dwarf2_per_objfile->reading_partial_symbols) |
| { |
| if (per_cu->cu == NULL || per_cu->cu->dies == NULL) |
| return 1; |
| return 0; |
| } |
| |
| /* Mark the dependence relation so that we don't flush PER_CU |
| too early. */ |
| if (dependent_cu != NULL) |
| dwarf2_add_dependence (dependent_cu, per_cu); |
| |
| /* If it's already on the queue, we have nothing to do. */ |
| if (per_cu->queued) |
| return 0; |
| |
| /* If the compilation unit is already loaded, just mark it as |
| used. */ |
| if (per_cu->cu != NULL) |
| { |
| per_cu->cu->last_used = 0; |
| return 0; |
| } |
| |
| /* Add it to the queue. */ |
| queue_comp_unit (per_cu, pretend_language); |
| |
| return 1; |
| } |
| |
| /* Process the queue. */ |
| |
| static void |
| process_queue (void) |
| { |
| struct dwarf2_queue_item *item, *next_item; |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Expanding one or more symtabs of objfile %s ...\n", |
| objfile_name (dwarf2_per_objfile->objfile)); |
| } |
| |
| /* The queue starts out with one item, but following a DIE reference |
| may load a new CU, adding it to the end of the queue. */ |
| for (item = dwarf2_queue; item != NULL; dwarf2_queue = item = next_item) |
| { |
| if ((dwarf2_per_objfile->using_index |
| ? !item->per_cu->v.quick->compunit_symtab |
| : (item->per_cu->v.psymtab && !item->per_cu->v.psymtab->readin)) |
| /* Skip dummy CUs. */ |
| && item->per_cu->cu != NULL) |
| { |
| struct dwarf2_per_cu_data *per_cu = item->per_cu; |
| unsigned int debug_print_threshold; |
| char buf[100]; |
| |
| if (per_cu->is_debug_types) |
| { |
| struct signatured_type *sig_type = |
| (struct signatured_type *) per_cu; |
| |
| sprintf (buf, "TU %s at offset 0x%x", |
| hex_string (sig_type->signature), |
| per_cu->offset.sect_off); |
| /* There can be 100s of TUs. |
| Only print them in verbose mode. */ |
| debug_print_threshold = 2; |
| } |
| else |
| { |
| sprintf (buf, "CU at offset 0x%x", per_cu->offset.sect_off); |
| debug_print_threshold = 1; |
| } |
| |
| if (dwarf_read_debug >= debug_print_threshold) |
| fprintf_unfiltered (gdb_stdlog, "Expanding symtab of %s\n", buf); |
| |
| if (per_cu->is_debug_types) |
| process_full_type_unit (per_cu, item->pretend_language); |
| else |
| process_full_comp_unit (per_cu, item->pretend_language); |
| |
| if (dwarf_read_debug >= debug_print_threshold) |
| fprintf_unfiltered (gdb_stdlog, "Done expanding %s\n", buf); |
| } |
| |
| item->per_cu->queued = 0; |
| next_item = item->next; |
| xfree (item); |
| } |
| |
| dwarf2_queue_tail = NULL; |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Done expanding symtabs of %s.\n", |
| objfile_name (dwarf2_per_objfile->objfile)); |
| } |
| } |
| |
| /* Free all allocated queue entries. This function only releases anything if |
| an error was thrown; if the queue was processed then it would have been |
| freed as we went along. */ |
| |
| static void |
| dwarf2_release_queue (void *dummy) |
| { |
| struct dwarf2_queue_item *item, *last; |
| |
| item = dwarf2_queue; |
| while (item) |
| { |
| /* Anything still marked queued is likely to be in an |
| inconsistent state, so discard it. */ |
| if (item->per_cu->queued) |
| { |
| if (item->per_cu->cu != NULL) |
| free_one_cached_comp_unit (item->per_cu); |
| item->per_cu->queued = 0; |
| } |
| |
| last = item; |
| item = item->next; |
| xfree (last); |
| } |
| |
| dwarf2_queue = dwarf2_queue_tail = NULL; |
| } |
| |
| /* Read in full symbols for PST, and anything it depends on. */ |
| |
| static void |
| psymtab_to_symtab_1 (struct partial_symtab *pst) |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| int i; |
| |
| if (pst->readin) |
| return; |
| |
| for (i = 0; i < pst->number_of_dependencies; i++) |
| if (!pst->dependencies[i]->readin |
| && pst->dependencies[i]->user == NULL) |
| { |
| /* Inform about additional files that need to be read in. */ |
| if (info_verbose) |
| { |
| /* FIXME: i18n: Need to make this a single string. */ |
| fputs_filtered (" ", gdb_stdout); |
| wrap_here (""); |
| fputs_filtered ("and ", gdb_stdout); |
| wrap_here (""); |
| printf_filtered ("%s...", pst->dependencies[i]->filename); |
| wrap_here (""); /* Flush output. */ |
| gdb_flush (gdb_stdout); |
| } |
| psymtab_to_symtab_1 (pst->dependencies[i]); |
| } |
| |
| per_cu = (struct dwarf2_per_cu_data *) pst->read_symtab_private; |
| |
| if (per_cu == NULL) |
| { |
| /* It's an include file, no symbols to read for it. |
| Everything is in the parent symtab. */ |
| pst->readin = 1; |
| return; |
| } |
| |
| dw2_do_instantiate_symtab (per_cu); |
| } |
| |
| /* Trivial hash function for die_info: the hash value of a DIE |
| is its offset in .debug_info for this objfile. */ |
| |
| static hashval_t |
| die_hash (const void *item) |
| { |
| const struct die_info *die = (const struct die_info *) item; |
| |
| return die->offset.sect_off; |
| } |
| |
| /* Trivial comparison function for die_info structures: two DIEs |
| are equal if they have the same offset. */ |
| |
| static int |
| die_eq (const void *item_lhs, const void *item_rhs) |
| { |
| const struct die_info *die_lhs = (const struct die_info *) item_lhs; |
| const struct die_info *die_rhs = (const struct die_info *) item_rhs; |
| |
| return die_lhs->offset.sect_off == die_rhs->offset.sect_off; |
| } |
| |
| /* die_reader_func for load_full_comp_unit. |
| This is identical to read_signatured_type_reader, |
| but is kept separate for now. */ |
| |
| static void |
| load_full_comp_unit_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| enum language *language_ptr = (enum language *) data; |
| |
| gdb_assert (cu->die_hash == NULL); |
| cu->die_hash = |
| htab_create_alloc_ex (cu->header.length / 12, |
| die_hash, |
| die_eq, |
| NULL, |
| &cu->comp_unit_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| |
| if (has_children) |
| comp_unit_die->child = read_die_and_siblings (reader, info_ptr, |
| &info_ptr, comp_unit_die); |
| cu->dies = comp_unit_die; |
| /* comp_unit_die is not stored in die_hash, no need. */ |
| |
| /* We try not to read any attributes in this function, because not |
| all CUs needed for references have been loaded yet, and symbol |
| table processing isn't initialized. But we have to set the CU language, |
| or we won't be able to build types correctly. |
| Similarly, if we do not read the producer, we can not apply |
| producer-specific interpretation. */ |
| prepare_one_comp_unit (cu, cu->dies, *language_ptr); |
| } |
| |
| /* Load the DIEs associated with PER_CU into memory. */ |
| |
| static void |
| load_full_comp_unit (struct dwarf2_per_cu_data *this_cu, |
| enum language pretend_language) |
| { |
| gdb_assert (! this_cu->is_debug_types); |
| |
| init_cutu_and_read_dies (this_cu, NULL, 1, 1, |
| load_full_comp_unit_reader, &pretend_language); |
| } |
| |
| /* Add a DIE to the delayed physname list. */ |
| |
| static void |
| add_to_method_list (struct type *type, int fnfield_index, int index, |
| const char *name, struct die_info *die, |
| struct dwarf2_cu *cu) |
| { |
| struct delayed_method_info mi; |
| mi.type = type; |
| mi.fnfield_index = fnfield_index; |
| mi.index = index; |
| mi.name = name; |
| mi.die = die; |
| VEC_safe_push (delayed_method_info, cu->method_list, &mi); |
| } |
| |
| /* A cleanup for freeing the delayed method list. */ |
| |
| static void |
| free_delayed_list (void *ptr) |
| { |
| struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr; |
| if (cu->method_list != NULL) |
| { |
| VEC_free (delayed_method_info, cu->method_list); |
| cu->method_list = NULL; |
| } |
| } |
| |
| /* Compute the physnames of any methods on the CU's method list. |
| |
| The computation of method physnames is delayed in order to avoid the |
| (bad) condition that one of the method's formal parameters is of an as yet |
| incomplete type. */ |
| |
| static void |
| compute_delayed_physnames (struct dwarf2_cu *cu) |
| { |
| int i; |
| struct delayed_method_info *mi; |
| for (i = 0; VEC_iterate (delayed_method_info, cu->method_list, i, mi) ; ++i) |
| { |
| const char *physname; |
| struct fn_fieldlist *fn_flp |
| = &TYPE_FN_FIELDLIST (mi->type, mi->fnfield_index); |
| physname = dwarf2_physname (mi->name, mi->die, cu); |
| TYPE_FN_FIELD_PHYSNAME (fn_flp->fn_fields, mi->index) |
| = physname ? physname : ""; |
| } |
| } |
| |
| /* Go objects should be embedded in a DW_TAG_module DIE, |
| and it's not clear if/how imported objects will appear. |
| To keep Go support simple until that's worked out, |
| go back through what we've read and create something usable. |
| We could do this while processing each DIE, and feels kinda cleaner, |
| but that way is more invasive. |
| This is to, for example, allow the user to type "p var" or "b main" |
| without having to specify the package name, and allow lookups |
| of module.object to work in contexts that use the expression |
| parser. */ |
| |
| static void |
| fixup_go_packaging (struct dwarf2_cu *cu) |
| { |
| char *package_name = NULL; |
| struct pending *list; |
| int i; |
| |
| for (list = global_symbols; list != NULL; list = list->next) |
| { |
| for (i = 0; i < list->nsyms; ++i) |
| { |
| struct symbol *sym = list->symbol[i]; |
| |
| if (SYMBOL_LANGUAGE (sym) == language_go |
| && SYMBOL_CLASS (sym) == LOC_BLOCK) |
| { |
| char *this_package_name = go_symbol_package_name (sym); |
| |
| if (this_package_name == NULL) |
| continue; |
| if (package_name == NULL) |
| package_name = this_package_name; |
| else |
| { |
| if (strcmp (package_name, this_package_name) != 0) |
| complaint (&symfile_complaints, |
| _("Symtab %s has objects from two different Go packages: %s and %s"), |
| (symbol_symtab (sym) != NULL |
| ? symtab_to_filename_for_display |
| (symbol_symtab (sym)) |
| : objfile_name (cu->objfile)), |
| this_package_name, package_name); |
| xfree (this_package_name); |
| } |
| } |
| } |
| } |
| |
| if (package_name != NULL) |
| { |
| struct objfile *objfile = cu->objfile; |
| const char *saved_package_name |
| = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack, |
| package_name, |
| strlen (package_name)); |
| struct type *type = init_type (objfile, TYPE_CODE_MODULE, 0, |
| saved_package_name); |
| struct symbol *sym; |
| |
| TYPE_TAG_NAME (type) = TYPE_NAME (type); |
| |
| sym = allocate_symbol (objfile); |
| SYMBOL_SET_LANGUAGE (sym, language_go, &objfile->objfile_obstack); |
| SYMBOL_SET_NAMES (sym, saved_package_name, |
| strlen (saved_package_name), 0, objfile); |
| /* This is not VAR_DOMAIN because we want a way to ensure a lookup of, |
| e.g., "main" finds the "main" module and not C's main(). */ |
| SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; |
| SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; |
| SYMBOL_TYPE (sym) = type; |
| |
| add_symbol_to_list (sym, &global_symbols); |
| |
| xfree (package_name); |
| } |
| } |
| |
| /* Return the symtab for PER_CU. This works properly regardless of |
| whether we're using the index or psymtabs. */ |
| |
| static struct compunit_symtab * |
| get_compunit_symtab (struct dwarf2_per_cu_data *per_cu) |
| { |
| return (dwarf2_per_objfile->using_index |
| ? per_cu->v.quick->compunit_symtab |
| : per_cu->v.psymtab->compunit_symtab); |
| } |
| |
| /* A helper function for computing the list of all symbol tables |
| included by PER_CU. */ |
| |
| static void |
| recursively_compute_inclusions (VEC (compunit_symtab_ptr) **result, |
| htab_t all_children, htab_t all_type_symtabs, |
| struct dwarf2_per_cu_data *per_cu, |
| struct compunit_symtab *immediate_parent) |
| { |
| void **slot; |
| int ix; |
| struct compunit_symtab *cust; |
| struct dwarf2_per_cu_data *iter; |
| |
| slot = htab_find_slot (all_children, per_cu, INSERT); |
| if (*slot != NULL) |
| { |
| /* This inclusion and its children have been processed. */ |
| return; |
| } |
| |
| *slot = per_cu; |
| /* Only add a CU if it has a symbol table. */ |
| cust = get_compunit_symtab (per_cu); |
| if (cust != NULL) |
| { |
| /* If this is a type unit only add its symbol table if we haven't |
| seen it yet (type unit per_cu's can share symtabs). */ |
| if (per_cu->is_debug_types) |
| { |
| slot = htab_find_slot (all_type_symtabs, cust, INSERT); |
| if (*slot == NULL) |
| { |
| *slot = cust; |
| VEC_safe_push (compunit_symtab_ptr, *result, cust); |
| if (cust->user == NULL) |
| cust->user = immediate_parent; |
| } |
| } |
| else |
| { |
| VEC_safe_push (compunit_symtab_ptr, *result, cust); |
| if (cust->user == NULL) |
| cust->user = immediate_parent; |
| } |
| } |
| |
| for (ix = 0; |
| VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, ix, iter); |
| ++ix) |
| { |
| recursively_compute_inclusions (result, all_children, |
| all_type_symtabs, iter, cust); |
| } |
| } |
| |
| /* Compute the compunit_symtab 'includes' fields for the compunit_symtab of |
| PER_CU. */ |
| |
| static void |
| compute_compunit_symtab_includes (struct dwarf2_per_cu_data *per_cu) |
| { |
| gdb_assert (! per_cu->is_debug_types); |
| |
| if (!VEC_empty (dwarf2_per_cu_ptr, per_cu->imported_symtabs)) |
| { |
| int ix, len; |
| struct dwarf2_per_cu_data *per_cu_iter; |
| struct compunit_symtab *compunit_symtab_iter; |
| VEC (compunit_symtab_ptr) *result_symtabs = NULL; |
| htab_t all_children, all_type_symtabs; |
| struct compunit_symtab *cust = get_compunit_symtab (per_cu); |
| |
| /* If we don't have a symtab, we can just skip this case. */ |
| if (cust == NULL) |
| return; |
| |
| all_children = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| all_type_symtabs = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| |
| for (ix = 0; |
| VEC_iterate (dwarf2_per_cu_ptr, per_cu->imported_symtabs, |
| ix, per_cu_iter); |
| ++ix) |
| { |
| recursively_compute_inclusions (&result_symtabs, all_children, |
| all_type_symtabs, per_cu_iter, |
| cust); |
| } |
| |
| /* Now we have a transitive closure of all the included symtabs. */ |
| len = VEC_length (compunit_symtab_ptr, result_symtabs); |
| cust->includes |
| = XOBNEWVEC (&dwarf2_per_objfile->objfile->objfile_obstack, |
| struct compunit_symtab *, len + 1); |
| for (ix = 0; |
| VEC_iterate (compunit_symtab_ptr, result_symtabs, ix, |
| compunit_symtab_iter); |
| ++ix) |
| cust->includes[ix] = compunit_symtab_iter; |
| cust->includes[len] = NULL; |
| |
| VEC_free (compunit_symtab_ptr, result_symtabs); |
| htab_delete (all_children); |
| htab_delete (all_type_symtabs); |
| } |
| } |
| |
| /* Compute the 'includes' field for the symtabs of all the CUs we just |
| read. */ |
| |
| static void |
| process_cu_includes (void) |
| { |
| int ix; |
| struct dwarf2_per_cu_data *iter; |
| |
| for (ix = 0; |
| VEC_iterate (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, |
| ix, iter); |
| ++ix) |
| { |
| if (! iter->is_debug_types) |
| compute_compunit_symtab_includes (iter); |
| } |
| |
| VEC_free (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus); |
| } |
| |
| /* Generate full symbol information for PER_CU, whose DIEs have |
| already been loaded into memory. */ |
| |
| static void |
| process_full_comp_unit (struct dwarf2_per_cu_data *per_cu, |
| enum language pretend_language) |
| { |
| struct dwarf2_cu *cu = per_cu->cu; |
| struct objfile *objfile = per_cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| CORE_ADDR lowpc, highpc; |
| struct compunit_symtab *cust; |
| struct cleanup *back_to, *delayed_list_cleanup; |
| CORE_ADDR baseaddr; |
| struct block *static_block; |
| CORE_ADDR addr; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| buildsym_init (); |
| back_to = make_cleanup (really_free_pendings, NULL); |
| delayed_list_cleanup = make_cleanup (free_delayed_list, cu); |
| |
| cu->list_in_scope = &file_symbols; |
| |
| cu->language = pretend_language; |
| cu->language_defn = language_def (cu->language); |
| |
| /* Do line number decoding in read_file_scope () */ |
| process_die (cu->dies, cu); |
| |
| /* For now fudge the Go package. */ |
| if (cu->language == language_go) |
| fixup_go_packaging (cu); |
| |
| /* Now that we have processed all the DIEs in the CU, all the types |
| should be complete, and it should now be safe to compute all of the |
| physnames. */ |
| compute_delayed_physnames (cu); |
| do_cleanups (delayed_list_cleanup); |
| |
| /* Some compilers don't define a DW_AT_high_pc attribute for the |
| compilation unit. If the DW_AT_high_pc is missing, synthesize |
| it, by scanning the DIE's below the compilation unit. */ |
| get_scope_pc_bounds (cu->dies, &lowpc, &highpc, cu); |
| |
| addr = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); |
| static_block = end_symtab_get_static_block (addr, 0, 1); |
| |
| /* If the comp unit has DW_AT_ranges, it may have discontiguous ranges. |
| Also, DW_AT_ranges may record ranges not belonging to any child DIEs |
| (such as virtual method tables). Record the ranges in STATIC_BLOCK's |
| addrmap to help ensure it has an accurate map of pc values belonging to |
| this comp unit. */ |
| dwarf2_record_block_ranges (cu->dies, static_block, baseaddr, cu); |
| |
| cust = end_symtab_from_static_block (static_block, |
| SECT_OFF_TEXT (objfile), 0); |
| |
| if (cust != NULL) |
| { |
| int gcc_4_minor = producer_is_gcc_ge_4 (cu->producer); |
| |
| /* Set symtab language to language from DW_AT_language. If the |
| compilation is from a C file generated by language preprocessors, do |
| not set the language if it was already deduced by start_subfile. */ |
| if (!(cu->language == language_c |
| && COMPUNIT_FILETABS (cust)->language != language_unknown)) |
| COMPUNIT_FILETABS (cust)->language = cu->language; |
| |
| /* GCC-4.0 has started to support -fvar-tracking. GCC-3.x still can |
| produce DW_AT_location with location lists but it can be possibly |
| invalid without -fvar-tracking. Still up to GCC-4.4.x incl. 4.4.0 |
| there were bugs in prologue debug info, fixed later in GCC-4.5 |
| by "unwind info for epilogues" patch (which is not directly related). |
| |
| For -gdwarf-4 type units LOCATIONS_VALID indication is fortunately not |
| needed, it would be wrong due to missing DW_AT_producer there. |
| |
| Still one can confuse GDB by using non-standard GCC compilation |
| options - this waits on GCC PR other/32998 (-frecord-gcc-switches). |
| */ |
| if (cu->has_loclist && gcc_4_minor >= 5) |
| cust->locations_valid = 1; |
| |
| if (gcc_4_minor >= 5) |
| cust->epilogue_unwind_valid = 1; |
| |
| cust->call_site_htab = cu->call_site_htab; |
| } |
| |
| if (dwarf2_per_objfile->using_index) |
| per_cu->v.quick->compunit_symtab = cust; |
| else |
| { |
| struct partial_symtab *pst = per_cu->v.psymtab; |
| pst->compunit_symtab = cust; |
| pst->readin = 1; |
| } |
| |
| /* Push it for inclusion processing later. */ |
| VEC_safe_push (dwarf2_per_cu_ptr, dwarf2_per_objfile->just_read_cus, per_cu); |
| |
| do_cleanups (back_to); |
| } |
| |
| /* Generate full symbol information for type unit PER_CU, whose DIEs have |
| already been loaded into memory. */ |
| |
| static void |
| process_full_type_unit (struct dwarf2_per_cu_data *per_cu, |
| enum language pretend_language) |
| { |
| struct dwarf2_cu *cu = per_cu->cu; |
| struct objfile *objfile = per_cu->objfile; |
| struct compunit_symtab *cust; |
| struct cleanup *back_to, *delayed_list_cleanup; |
| struct signatured_type *sig_type; |
| |
| gdb_assert (per_cu->is_debug_types); |
| sig_type = (struct signatured_type *) per_cu; |
| |
| buildsym_init (); |
| back_to = make_cleanup (really_free_pendings, NULL); |
| delayed_list_cleanup = make_cleanup (free_delayed_list, cu); |
| |
| cu->list_in_scope = &file_symbols; |
| |
| cu->language = pretend_language; |
| cu->language_defn = language_def (cu->language); |
| |
| /* The symbol tables are set up in read_type_unit_scope. */ |
| process_die (cu->dies, cu); |
| |
| /* For now fudge the Go package. */ |
| if (cu->language == language_go) |
| fixup_go_packaging (cu); |
| |
| /* Now that we have processed all the DIEs in the CU, all the types |
| should be complete, and it should now be safe to compute all of the |
| physnames. */ |
| compute_delayed_physnames (cu); |
| do_cleanups (delayed_list_cleanup); |
| |
| /* TUs share symbol tables. |
| If this is the first TU to use this symtab, complete the construction |
| of it with end_expandable_symtab. Otherwise, complete the addition of |
| this TU's symbols to the existing symtab. */ |
| if (sig_type->type_unit_group->compunit_symtab == NULL) |
| { |
| cust = end_expandable_symtab (0, SECT_OFF_TEXT (objfile)); |
| sig_type->type_unit_group->compunit_symtab = cust; |
| |
| if (cust != NULL) |
| { |
| /* Set symtab language to language from DW_AT_language. If the |
| compilation is from a C file generated by language preprocessors, |
| do not set the language if it was already deduced by |
| start_subfile. */ |
| if (!(cu->language == language_c |
| && COMPUNIT_FILETABS (cust)->language != language_c)) |
| COMPUNIT_FILETABS (cust)->language = cu->language; |
| } |
| } |
| else |
| { |
| augment_type_symtab (); |
| cust = sig_type->type_unit_group->compunit_symtab; |
| } |
| |
| if (dwarf2_per_objfile->using_index) |
| per_cu->v.quick->compunit_symtab = cust; |
| else |
| { |
| struct partial_symtab *pst = per_cu->v.psymtab; |
| pst->compunit_symtab = cust; |
| pst->readin = 1; |
| } |
| |
| do_cleanups (back_to); |
| } |
| |
| /* Process an imported unit DIE. */ |
| |
| static void |
| process_imported_unit_die (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| /* For now we don't handle imported units in type units. */ |
| if (cu->per_cu->is_debug_types) |
| { |
| error (_("Dwarf Error: DW_TAG_imported_unit is not" |
| " supported in type units [in module %s]"), |
| objfile_name (cu->objfile)); |
| } |
| |
| attr = dwarf2_attr (die, DW_AT_import, cu); |
| if (attr != NULL) |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| sect_offset offset; |
| int is_dwz; |
| |
| offset = dwarf2_get_ref_die_offset (attr); |
| is_dwz = (attr->form == DW_FORM_GNU_ref_alt || cu->per_cu->is_dwz); |
| per_cu = dwarf2_find_containing_comp_unit (offset, is_dwz, cu->objfile); |
| |
| /* If necessary, add it to the queue and load its DIEs. */ |
| if (maybe_queue_comp_unit (cu, per_cu, cu->language)) |
| load_full_comp_unit (per_cu, cu->language); |
| |
| VEC_safe_push (dwarf2_per_cu_ptr, cu->per_cu->imported_symtabs, |
| per_cu); |
| } |
| } |
| |
| /* Reset the in_process bit of a die. */ |
| |
| static void |
| reset_die_in_process (void *arg) |
| { |
| struct die_info *die = (struct die_info *) arg; |
| |
| die->in_process = 0; |
| } |
| |
| /* Process a die and its children. */ |
| |
| static void |
| process_die (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct cleanup *in_process; |
| |
| /* We should only be processing those not already in process. */ |
| gdb_assert (!die->in_process); |
| |
| die->in_process = 1; |
| in_process = make_cleanup (reset_die_in_process,die); |
| |
| switch (die->tag) |
| { |
| case DW_TAG_padding: |
| break; |
| case DW_TAG_compile_unit: |
| case DW_TAG_partial_unit: |
| read_file_scope (die, cu); |
| break; |
| case DW_TAG_type_unit: |
| read_type_unit_scope (die, cu); |
| break; |
| case DW_TAG_subprogram: |
| case DW_TAG_inlined_subroutine: |
| read_func_scope (die, cu); |
| break; |
| case DW_TAG_lexical_block: |
| case DW_TAG_try_block: |
| case DW_TAG_catch_block: |
| read_lexical_block_scope (die, cu); |
| break; |
| case DW_TAG_GNU_call_site: |
| read_call_site_scope (die, cu); |
| break; |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| process_structure_scope (die, cu); |
| break; |
| case DW_TAG_enumeration_type: |
| process_enumeration_scope (die, cu); |
| break; |
| |
| /* These dies have a type, but processing them does not create |
| a symbol or recurse to process the children. Therefore we can |
| read them on-demand through read_type_die. */ |
| case DW_TAG_subroutine_type: |
| case DW_TAG_set_type: |
| case DW_TAG_array_type: |
| case DW_TAG_pointer_type: |
| case DW_TAG_ptr_to_member_type: |
| case DW_TAG_reference_type: |
| case DW_TAG_string_type: |
| break; |
| |
| case DW_TAG_base_type: |
| case DW_TAG_subrange_type: |
| case DW_TAG_typedef: |
| /* Add a typedef symbol for the type definition, if it has a |
| DW_AT_name. */ |
| new_symbol (die, read_type_die (die, cu), cu); |
| break; |
| case DW_TAG_common_block: |
| read_common_block (die, cu); |
| break; |
| case DW_TAG_common_inclusion: |
| break; |
| case DW_TAG_namespace: |
| cu->processing_has_namespace_info = 1; |
| read_namespace (die, cu); |
| break; |
| case DW_TAG_module: |
| cu->processing_has_namespace_info = 1; |
| read_module (die, cu); |
| break; |
| case DW_TAG_imported_declaration: |
| cu->processing_has_namespace_info = 1; |
| if (read_namespace_alias (die, cu)) |
| break; |
| /* The declaration is not a global namespace alias: fall through. */ |
| case DW_TAG_imported_module: |
| cu->processing_has_namespace_info = 1; |
| if (die->child != NULL && (die->tag == DW_TAG_imported_declaration |
| || cu->language != language_fortran)) |
| complaint (&symfile_complaints, _("Tag '%s' has unexpected children"), |
| dwarf_tag_name (die->tag)); |
| read_import_statement (die, cu); |
| break; |
| |
| case DW_TAG_imported_unit: |
| process_imported_unit_die (die, cu); |
| break; |
| |
| default: |
| new_symbol (die, NULL, cu); |
| break; |
| } |
| |
| do_cleanups (in_process); |
| } |
| |
| /* DWARF name computation. */ |
| |
| /* A helper function for dwarf2_compute_name which determines whether DIE |
| needs to have the name of the scope prepended to the name listed in the |
| die. */ |
| |
| static int |
| die_needs_namespace (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| switch (die->tag) |
| { |
| case DW_TAG_namespace: |
| case DW_TAG_typedef: |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| case DW_TAG_enumeration_type: |
| case DW_TAG_enumerator: |
| case DW_TAG_subprogram: |
| case DW_TAG_inlined_subroutine: |
| case DW_TAG_member: |
| case DW_TAG_imported_declaration: |
| return 1; |
| |
| case DW_TAG_variable: |
| case DW_TAG_constant: |
| /* We only need to prefix "globally" visible variables. These include |
| any variable marked with DW_AT_external or any variable that |
| lives in a namespace. [Variables in anonymous namespaces |
| require prefixing, but they are not DW_AT_external.] */ |
| |
| if (dwarf2_attr (die, DW_AT_specification, cu)) |
| { |
| struct dwarf2_cu *spec_cu = cu; |
| |
| return die_needs_namespace (die_specification (die, &spec_cu), |
| spec_cu); |
| } |
| |
| attr = dwarf2_attr (die, DW_AT_external, cu); |
| if (attr == NULL && die->parent->tag != DW_TAG_namespace |
| && die->parent->tag != DW_TAG_module) |
| return 0; |
| /* A variable in a lexical block of some kind does not need a |
| namespace, even though in C++ such variables may be external |
| and have a mangled name. */ |
| if (die->parent->tag == DW_TAG_lexical_block |
| || die->parent->tag == DW_TAG_try_block |
| || die->parent->tag == DW_TAG_catch_block |
| || die->parent->tag == DW_TAG_subprogram) |
| return 0; |
| return 1; |
| |
| default: |
| return 0; |
| } |
| } |
| |
| /* Retrieve the last character from a mem_file. */ |
| |
| static void |
| do_ui_file_peek_last (void *object, const char *buffer, long length) |
| { |
| char *last_char_p = (char *) object; |
| |
| if (length > 0) |
| *last_char_p = buffer[length - 1]; |
| } |
| |
| /* Compute the fully qualified name of DIE in CU. If PHYSNAME is nonzero, |
| compute the physname for the object, which include a method's: |
| - formal parameters (C++), |
| - receiver type (Go), |
| |
| The term "physname" is a bit confusing. |
| For C++, for example, it is the demangled name. |
| For Go, for example, it's the mangled name. |
| |
| For Ada, return the DIE's linkage name rather than the fully qualified |
| name. PHYSNAME is ignored.. |
| |
| The result is allocated on the objfile_obstack and canonicalized. */ |
| |
| static const char * |
| dwarf2_compute_name (const char *name, |
| struct die_info *die, struct dwarf2_cu *cu, |
| int physname) |
| { |
| struct objfile *objfile = cu->objfile; |
| |
| if (name == NULL) |
| name = dwarf2_name (die, cu); |
| |
| /* For Fortran GDB prefers DW_AT_*linkage_name for the physname if present |
| but otherwise compute it by typename_concat inside GDB. |
| FIXME: Actually this is not really true, or at least not always true. |
| It's all very confusing. SYMBOL_SET_NAMES doesn't try to demangle |
| Fortran names because there is no mangling standard. So new_symbol_full |
| will set the demangled name to the result of dwarf2_full_name, and it is |
| the demangled name that GDB uses if it exists. */ |
| if (cu->language == language_ada |
| || (cu->language == language_fortran && physname)) |
| { |
| /* For Ada unit, we prefer the linkage name over the name, as |
| the former contains the exported name, which the user expects |
| to be able to reference. Ideally, we want the user to be able |
| to reference this entity using either natural or linkage name, |
| but we haven't started looking at this enhancement yet. */ |
| const char *linkage_name; |
| |
| linkage_name = dwarf2_string_attr (die, DW_AT_linkage_name, cu); |
| if (linkage_name == NULL) |
| linkage_name = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); |
| if (linkage_name != NULL) |
| return linkage_name; |
| } |
| |
| /* These are the only languages we know how to qualify names in. */ |
| if (name != NULL |
| && (cu->language == language_cplus |
| || cu->language == language_fortran || cu->language == language_d |
| || cu->language == language_rust)) |
| { |
| if (die_needs_namespace (die, cu)) |
| { |
| long length; |
| const char *prefix; |
| struct ui_file *buf; |
| const char *canonical_name = NULL; |
| |
| prefix = determine_prefix (die, cu); |
| buf = mem_fileopen (); |
| if (*prefix != '\0') |
| { |
| char *prefixed_name = typename_concat (NULL, prefix, name, |
| physname, cu); |
| |
| fputs_unfiltered (prefixed_name, buf); |
| xfree (prefixed_name); |
| } |
| else |
| fputs_unfiltered (name, buf); |
| |
| /* Template parameters may be specified in the DIE's DW_AT_name, or |
| as children with DW_TAG_template_type_param or |
| DW_TAG_value_type_param. If the latter, add them to the name |
| here. If the name already has template parameters, then |
| skip this step; some versions of GCC emit both, and |
| it is more efficient to use the pre-computed name. |
| |
| Something to keep in mind about this process: it is very |
| unlikely, or in some cases downright impossible, to produce |
| something that will match the mangled name of a function. |
| If the definition of the function has the same debug info, |
| we should be able to match up with it anyway. But fallbacks |
| using the minimal symbol, for instance to find a method |
| implemented in a stripped copy of libstdc++, will not work. |
| If we do not have debug info for the definition, we will have to |
| match them up some other way. |
| |
| When we do name matching there is a related problem with function |
| templates; two instantiated function templates are allowed to |
| differ only by their return types, which we do not add here. */ |
| |
| if (cu->language == language_cplus && strchr (name, '<') == NULL) |
| { |
| struct attribute *attr; |
| struct die_info *child; |
| int first = 1; |
| |
| die->building_fullname = 1; |
| |
| for (child = die->child; child != NULL; child = child->sibling) |
| { |
| struct type *type; |
| LONGEST value; |
| const gdb_byte *bytes; |
| struct dwarf2_locexpr_baton *baton; |
| struct value *v; |
| |
| if (child->tag != DW_TAG_template_type_param |
| && child->tag != DW_TAG_template_value_param) |
| continue; |
| |
| if (first) |
| { |
| fputs_unfiltered ("<", buf); |
| first = 0; |
| } |
| else |
| fputs_unfiltered (", ", buf); |
| |
| attr = dwarf2_attr (child, DW_AT_type, cu); |
| if (attr == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("template parameter missing DW_AT_type")); |
| fputs_unfiltered ("UNKNOWN_TYPE", buf); |
| continue; |
| } |
| type = die_type (child, cu); |
| |
| if (child->tag == DW_TAG_template_type_param) |
| { |
| c_print_type (type, "", buf, -1, 0, &type_print_raw_options); |
| continue; |
| } |
| |
| attr = dwarf2_attr (child, DW_AT_const_value, cu); |
| if (attr == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("template parameter missing " |
| "DW_AT_const_value")); |
| fputs_unfiltered ("UNKNOWN_VALUE", buf); |
| continue; |
| } |
| |
| dwarf2_const_value_attr (attr, type, name, |
| &cu->comp_unit_obstack, cu, |
| &value, &bytes, &baton); |
| |
| if (TYPE_NOSIGN (type)) |
| /* GDB prints characters as NUMBER 'CHAR'. If that's |
| changed, this can use value_print instead. */ |
| c_printchar (value, type, buf); |
| else |
| { |
| struct value_print_options opts; |
| |
| if (baton != NULL) |
| v = dwarf2_evaluate_loc_desc (type, NULL, |
| baton->data, |
| baton->size, |
| baton->per_cu); |
| else if (bytes != NULL) |
| { |
| v = allocate_value (type); |
| memcpy (value_contents_writeable (v), bytes, |
| TYPE_LENGTH (type)); |
| } |
| else |
| v = value_from_longest (type, value); |
| |
| /* Specify decimal so that we do not depend on |
| the radix. */ |
| get_formatted_print_options (&opts, 'd'); |
| opts.raw = 1; |
| value_print (v, buf, &opts); |
| release_value (v); |
| value_free (v); |
| } |
| } |
| |
| die->building_fullname = 0; |
| |
| if (!first) |
| { |
| /* Close the argument list, with a space if necessary |
| (nested templates). */ |
| char last_char = '\0'; |
| ui_file_put (buf, do_ui_file_peek_last, &last_char); |
| if (last_char == '>') |
| fputs_unfiltered (" >", buf); |
| else |
| fputs_unfiltered (">", buf); |
| } |
| } |
| |
| /* For C++ methods, append formal parameter type |
| information, if PHYSNAME. */ |
| |
| if (physname && die->tag == DW_TAG_subprogram |
| && cu->language == language_cplus) |
| { |
| struct type *type = read_type_die (die, cu); |
| |
| c_type_print_args (type, buf, 1, cu->language, |
| &type_print_raw_options); |
| |
| if (cu->language == language_cplus) |
| { |
| /* Assume that an artificial first parameter is |
| "this", but do not crash if it is not. RealView |
| marks unnamed (and thus unused) parameters as |
| artificial; there is no way to differentiate |
| the two cases. */ |
| if (TYPE_NFIELDS (type) > 0 |
| && TYPE_FIELD_ARTIFICIAL (type, 0) |
| && TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_PTR |
| && TYPE_CONST (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, |
| 0)))) |
| fputs_unfiltered (" const", buf); |
| } |
| } |
| |
| std::string intermediate_name = ui_file_as_string (buf); |
| ui_file_delete (buf); |
| |
| if (cu->language == language_cplus) |
| canonical_name |
| = dwarf2_canonicalize_name (intermediate_name.c_str (), cu, |
| &objfile->per_bfd->storage_obstack); |
| |
| /* If we only computed INTERMEDIATE_NAME, or if |
| INTERMEDIATE_NAME is already canonical, then we need to |
| copy it to the appropriate obstack. */ |
| if (canonical_name == NULL || canonical_name == intermediate_name.c_str ()) |
| name = ((const char *) |
| obstack_copy0 (&objfile->per_bfd->storage_obstack, |
| intermediate_name.c_str (), |
| intermediate_name.length ())); |
| else |
| name = canonical_name; |
| } |
| } |
| |
| return name; |
| } |
| |
| /* Return the fully qualified name of DIE, based on its DW_AT_name. |
| If scope qualifiers are appropriate they will be added. The result |
| will be allocated on the storage_obstack, or NULL if the DIE does |
| not have a name. NAME may either be from a previous call to |
| dwarf2_name or NULL. |
| |
| The output string will be canonicalized (if C++). */ |
| |
| static const char * |
| dwarf2_full_name (const char *name, struct die_info *die, struct dwarf2_cu *cu) |
| { |
| return dwarf2_compute_name (name, die, cu, 0); |
| } |
| |
| /* Construct a physname for the given DIE in CU. NAME may either be |
| from a previous call to dwarf2_name or NULL. The result will be |
| allocated on the objfile_objstack or NULL if the DIE does not have a |
| name. |
| |
| The output string will be canonicalized (if C++). */ |
| |
| static const char * |
| dwarf2_physname (const char *name, struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| const char *retval, *mangled = NULL, *canon = NULL; |
| struct cleanup *back_to; |
| int need_copy = 1; |
| |
| /* In this case dwarf2_compute_name is just a shortcut not building anything |
| on its own. */ |
| if (!die_needs_namespace (die, cu)) |
| return dwarf2_compute_name (name, die, cu, 1); |
| |
| back_to = make_cleanup (null_cleanup, NULL); |
| |
| mangled = dwarf2_string_attr (die, DW_AT_linkage_name, cu); |
| if (mangled == NULL) |
| mangled = dwarf2_string_attr (die, DW_AT_MIPS_linkage_name, cu); |
| |
| /* rustc emits invalid values for DW_AT_linkage_name. Ignore these. |
| See https://github.com/rust-lang/rust/issues/32925. */ |
| if (cu->language == language_rust && mangled != NULL |
| && strchr (mangled, '{') != NULL) |
| mangled = NULL; |
| |
| /* DW_AT_linkage_name is missing in some cases - depend on what GDB |
| has computed. */ |
| if (mangled != NULL) |
| { |
| char *demangled; |
| |
| /* Use DMGL_RET_DROP for C++ template functions to suppress their return |
| type. It is easier for GDB users to search for such functions as |
| `name(params)' than `long name(params)'. In such case the minimal |
| symbol names do not match the full symbol names but for template |
| functions there is never a need to look up their definition from their |
| declaration so the only disadvantage remains the minimal symbol |
| variant `long name(params)' does not have the proper inferior type. |
| */ |
| |
| if (cu->language == language_go) |
| { |
| /* This is a lie, but we already lie to the caller new_symbol_full. |
| new_symbol_full assumes we return the mangled name. |
| This just undoes that lie until things are cleaned up. */ |
| demangled = NULL; |
| } |
| else |
| { |
| demangled = gdb_demangle (mangled, |
| (DMGL_PARAMS | DMGL_ANSI | DMGL_RET_DROP)); |
| } |
| if (demangled) |
| { |
| make_cleanup (xfree, demangled); |
| canon = demangled; |
| } |
| else |
| { |
| canon = mangled; |
| need_copy = 0; |
| } |
| } |
| |
| if (canon == NULL || check_physname) |
| { |
| const char *physname = dwarf2_compute_name (name, die, cu, 1); |
| |
| if (canon != NULL && strcmp (physname, canon) != 0) |
| { |
| /* It may not mean a bug in GDB. The compiler could also |
| compute DW_AT_linkage_name incorrectly. But in such case |
| GDB would need to be bug-to-bug compatible. */ |
| |
| complaint (&symfile_complaints, |
| _("Computed physname <%s> does not match demangled <%s> " |
| "(from linkage <%s>) - DIE at 0x%x [in module %s]"), |
| physname, canon, mangled, die->offset.sect_off, |
| objfile_name (objfile)); |
| |
| /* Prefer DW_AT_linkage_name (in the CANON form) - when it |
| is available here - over computed PHYSNAME. It is safer |
| against both buggy GDB and buggy compilers. */ |
| |
| retval = canon; |
| } |
| else |
| { |
| retval = physname; |
| need_copy = 0; |
| } |
| } |
| else |
| retval = canon; |
| |
| if (need_copy) |
| retval = ((const char *) |
| obstack_copy0 (&objfile->per_bfd->storage_obstack, |
| retval, strlen (retval))); |
| |
| do_cleanups (back_to); |
| return retval; |
| } |
| |
| /* Inspect DIE in CU for a namespace alias. If one exists, record |
| a new symbol for it. |
| |
| Returns 1 if a namespace alias was recorded, 0 otherwise. */ |
| |
| static int |
| read_namespace_alias (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| /* If the die does not have a name, this is not a namespace |
| alias. */ |
| attr = dwarf2_attr (die, DW_AT_name, cu); |
| if (attr != NULL) |
| { |
| int num; |
| struct die_info *d = die; |
| struct dwarf2_cu *imported_cu = cu; |
| |
| /* If the compiler has nested DW_AT_imported_declaration DIEs, |
| keep inspecting DIEs until we hit the underlying import. */ |
| #define MAX_NESTED_IMPORTED_DECLARATIONS 100 |
| for (num = 0; num < MAX_NESTED_IMPORTED_DECLARATIONS; ++num) |
| { |
| attr = dwarf2_attr (d, DW_AT_import, cu); |
| if (attr == NULL) |
| break; |
| |
| d = follow_die_ref (d, attr, &imported_cu); |
| if (d->tag != DW_TAG_imported_declaration) |
| break; |
| } |
| |
| if (num == MAX_NESTED_IMPORTED_DECLARATIONS) |
| { |
| complaint (&symfile_complaints, |
| _("DIE at 0x%x has too many recursively imported " |
| "declarations"), d->offset.sect_off); |
| return 0; |
| } |
| |
| if (attr != NULL) |
| { |
| struct type *type; |
| sect_offset offset = dwarf2_get_ref_die_offset (attr); |
| |
| type = get_die_type_at_offset (offset, cu->per_cu); |
| if (type != NULL && TYPE_CODE (type) == TYPE_CODE_NAMESPACE) |
| { |
| /* This declaration is a global namespace alias. Add |
| a symbol for it whose type is the aliased namespace. */ |
| new_symbol (die, type, cu); |
| return 1; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* Return the using directives repository (global or local?) to use in the |
| current context for LANGUAGE. |
| |
| For Ada, imported declarations can materialize renamings, which *may* be |
| global. However it is impossible (for now?) in DWARF to distinguish |
| "external" imported declarations and "static" ones. As all imported |
| declarations seem to be static in all other languages, make them all CU-wide |
| global only in Ada. */ |
| |
| static struct using_direct ** |
| using_directives (enum language language) |
| { |
| if (language == language_ada && context_stack_depth == 0) |
| return &global_using_directives; |
| else |
| return &local_using_directives; |
| } |
| |
| /* Read the import statement specified by the given die and record it. */ |
| |
| static void |
| read_import_statement (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct attribute *import_attr; |
| struct die_info *imported_die, *child_die; |
| struct dwarf2_cu *imported_cu; |
| const char *imported_name; |
| const char *imported_name_prefix; |
| const char *canonical_name; |
| const char *import_alias; |
| const char *imported_declaration = NULL; |
| const char *import_prefix; |
| VEC (const_char_ptr) *excludes = NULL; |
| struct cleanup *cleanups; |
| |
| import_attr = dwarf2_attr (die, DW_AT_import, cu); |
| if (import_attr == NULL) |
| { |
| complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"), |
| dwarf_tag_name (die->tag)); |
| return; |
| } |
| |
| imported_cu = cu; |
| imported_die = follow_die_ref_or_sig (die, import_attr, &imported_cu); |
| imported_name = dwarf2_name (imported_die, imported_cu); |
| if (imported_name == NULL) |
| { |
| /* GCC bug: https://bugzilla.redhat.com/show_bug.cgi?id=506524 |
| |
| The import in the following code: |
| namespace A |
| { |
| typedef int B; |
| } |
| |
| int main () |
| { |
| using A::B; |
| B b; |
| return b; |
| } |
| |
| ... |
| <2><51>: Abbrev Number: 3 (DW_TAG_imported_declaration) |
| <52> DW_AT_decl_file : 1 |
| <53> DW_AT_decl_line : 6 |
| <54> DW_AT_import : <0x75> |
| <2><58>: Abbrev Number: 4 (DW_TAG_typedef) |
| <59> DW_AT_name : B |
| <5b> DW_AT_decl_file : 1 |
| <5c> DW_AT_decl_line : 2 |
| <5d> DW_AT_type : <0x6e> |
| ... |
| <1><75>: Abbrev Number: 7 (DW_TAG_base_type) |
| <76> DW_AT_byte_size : 4 |
| <77> DW_AT_encoding : 5 (signed) |
| |
| imports the wrong die ( 0x75 instead of 0x58 ). |
| This case will be ignored until the gcc bug is fixed. */ |
| return; |
| } |
| |
| /* Figure out the local name after import. */ |
| import_alias = dwarf2_name (die, cu); |
| |
| /* Figure out where the statement is being imported to. */ |
| import_prefix = determine_prefix (die, cu); |
| |
| /* Figure out what the scope of the imported die is and prepend it |
| to the name of the imported die. */ |
| imported_name_prefix = determine_prefix (imported_die, imported_cu); |
| |
| if (imported_die->tag != DW_TAG_namespace |
| && imported_die->tag != DW_TAG_module) |
| { |
| imported_declaration = imported_name; |
| canonical_name = imported_name_prefix; |
| } |
| else if (strlen (imported_name_prefix) > 0) |
| canonical_name = obconcat (&objfile->objfile_obstack, |
| imported_name_prefix, |
| (cu->language == language_d ? "." : "::"), |
| imported_name, (char *) NULL); |
| else |
| canonical_name = imported_name; |
| |
| cleanups = make_cleanup (VEC_cleanup (const_char_ptr), &excludes); |
| |
| if (die->tag == DW_TAG_imported_module && cu->language == language_fortran) |
| for (child_die = die->child; child_die && child_die->tag; |
| child_die = sibling_die (child_die)) |
| { |
| /* DWARF-4: A Fortran use statement with a “rename list” may be |
| represented by an imported module entry with an import attribute |
| referring to the module and owned entries corresponding to those |
| entities that are renamed as part of being imported. */ |
| |
| if (child_die->tag != DW_TAG_imported_declaration) |
| { |
| complaint (&symfile_complaints, |
| _("child DW_TAG_imported_declaration expected " |
| "- DIE at 0x%x [in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| continue; |
| } |
| |
| import_attr = dwarf2_attr (child_die, DW_AT_import, cu); |
| if (import_attr == NULL) |
| { |
| complaint (&symfile_complaints, _("Tag '%s' has no DW_AT_import"), |
| dwarf_tag_name (child_die->tag)); |
| continue; |
| } |
| |
| imported_cu = cu; |
| imported_die = follow_die_ref_or_sig (child_die, import_attr, |
| &imported_cu); |
| imported_name = dwarf2_name (imported_die, imported_cu); |
| if (imported_name == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("child DW_TAG_imported_declaration has unknown " |
| "imported name - DIE at 0x%x [in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| continue; |
| } |
| |
| VEC_safe_push (const_char_ptr, excludes, imported_name); |
| |
| process_die (child_die, cu); |
| } |
| |
| add_using_directive (using_directives (cu->language), |
| import_prefix, |
| canonical_name, |
| import_alias, |
| imported_declaration, |
| excludes, |
| 0, |
| &objfile->objfile_obstack); |
| |
| do_cleanups (cleanups); |
| } |
| |
| /* Cleanup function for handle_DW_AT_stmt_list. */ |
| |
| static void |
| free_cu_line_header (void *arg) |
| { |
| struct dwarf2_cu *cu = (struct dwarf2_cu *) arg; |
| |
| free_line_header (cu->line_header); |
| cu->line_header = NULL; |
| } |
| |
| /* Check for possibly missing DW_AT_comp_dir with relative .debug_line |
| directory paths. GCC SVN r127613 (new option -fdebug-prefix-map) fixed |
| this, it was first present in GCC release 4.3.0. */ |
| |
| static int |
| producer_is_gcc_lt_4_3 (struct dwarf2_cu *cu) |
| { |
| if (!cu->checked_producer) |
| check_producer (cu); |
| |
| return cu->producer_is_gcc_lt_4_3; |
| } |
| |
| static void |
| find_file_and_directory (struct die_info *die, struct dwarf2_cu *cu, |
| const char **name, const char **comp_dir) |
| { |
| /* Find the filename. Do not use dwarf2_name here, since the filename |
| is not a source language identifier. */ |
| *name = dwarf2_string_attr (die, DW_AT_name, cu); |
| *comp_dir = dwarf2_string_attr (die, DW_AT_comp_dir, cu); |
| |
| if (*comp_dir == NULL |
| && producer_is_gcc_lt_4_3 (cu) && *name != NULL |
| && IS_ABSOLUTE_PATH (*name)) |
| { |
| char *d = ldirname (*name); |
| |
| *comp_dir = d; |
| if (d != NULL) |
| make_cleanup (xfree, d); |
| } |
| if (*comp_dir != NULL) |
| { |
| /* Irix 6.2 native cc prepends <machine>.: to the compilation |
| directory, get rid of it. */ |
| const char *cp = strchr (*comp_dir, ':'); |
| |
| if (cp && cp != *comp_dir && cp[-1] == '.' && cp[1] == '/') |
| *comp_dir = cp + 1; |
| } |
| |
| if (*name == NULL) |
| *name = "<unknown>"; |
| } |
| |
| /* Handle DW_AT_stmt_list for a compilation unit. |
| DIE is the DW_TAG_compile_unit die for CU. |
| COMP_DIR is the compilation directory. LOWPC is passed to |
| dwarf_decode_lines. See dwarf_decode_lines comments about it. */ |
| |
| static void |
| handle_DW_AT_stmt_list (struct die_info *die, struct dwarf2_cu *cu, |
| const char *comp_dir, CORE_ADDR lowpc) /* ARI: editCase function */ |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct attribute *attr; |
| unsigned int line_offset; |
| struct line_header line_header_local; |
| hashval_t line_header_local_hash; |
| unsigned u; |
| void **slot; |
| int decode_mapping; |
| |
| gdb_assert (! cu->per_cu->is_debug_types); |
| |
| attr = dwarf2_attr (die, DW_AT_stmt_list, cu); |
| if (attr == NULL) |
| return; |
| |
| line_offset = DW_UNSND (attr); |
| |
| /* The line header hash table is only created if needed (it exists to |
| prevent redundant reading of the line table for partial_units). |
| If we're given a partial_unit, we'll need it. If we're given a |
| compile_unit, then use the line header hash table if it's already |
| created, but don't create one just yet. */ |
| |
| if (dwarf2_per_objfile->line_header_hash == NULL |
| && die->tag == DW_TAG_partial_unit) |
| { |
| dwarf2_per_objfile->line_header_hash |
| = htab_create_alloc_ex (127, line_header_hash_voidp, |
| line_header_eq_voidp, |
| free_line_header_voidp, |
| &objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| line_header_local.offset.sect_off = line_offset; |
| line_header_local.offset_in_dwz = cu->per_cu->is_dwz; |
| line_header_local_hash = line_header_hash (&line_header_local); |
| if (dwarf2_per_objfile->line_header_hash != NULL) |
| { |
| slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash, |
| &line_header_local, |
| line_header_local_hash, NO_INSERT); |
| |
| /* For DW_TAG_compile_unit we need info like symtab::linetable which |
| is not present in *SLOT (since if there is something in *SLOT then |
| it will be for a partial_unit). */ |
| if (die->tag == DW_TAG_partial_unit && slot != NULL) |
| { |
| gdb_assert (*slot != NULL); |
| cu->line_header = (struct line_header *) *slot; |
| return; |
| } |
| } |
| |
| /* dwarf_decode_line_header does not yet provide sufficient information. |
| We always have to call also dwarf_decode_lines for it. */ |
| cu->line_header = dwarf_decode_line_header (line_offset, cu); |
| if (cu->line_header == NULL) |
| return; |
| |
| if (dwarf2_per_objfile->line_header_hash == NULL) |
| slot = NULL; |
| else |
| { |
| slot = htab_find_slot_with_hash (dwarf2_per_objfile->line_header_hash, |
| &line_header_local, |
| line_header_local_hash, INSERT); |
| gdb_assert (slot != NULL); |
| } |
| if (slot != NULL && *slot == NULL) |
| { |
| /* This newly decoded line number information unit will be owned |
| by line_header_hash hash table. */ |
| *slot = cu->line_header; |
| } |
| else |
| { |
| /* We cannot free any current entry in (*slot) as that struct line_header |
| may be already used by multiple CUs. Create only temporary decoded |
| line_header for this CU - it may happen at most once for each line |
| number information unit. And if we're not using line_header_hash |
| then this is what we want as well. */ |
| gdb_assert (die->tag != DW_TAG_partial_unit); |
| make_cleanup (free_cu_line_header, cu); |
| } |
| decode_mapping = (die->tag != DW_TAG_partial_unit); |
| dwarf_decode_lines (cu->line_header, comp_dir, cu, NULL, lowpc, |
| decode_mapping); |
| } |
| |
| /* Process DW_TAG_compile_unit or DW_TAG_partial_unit. */ |
| |
| static void |
| read_file_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct cleanup *back_to = make_cleanup (null_cleanup, 0); |
| CORE_ADDR lowpc = ((CORE_ADDR) -1); |
| CORE_ADDR highpc = ((CORE_ADDR) 0); |
| struct attribute *attr; |
| const char *name = NULL; |
| const char *comp_dir = NULL; |
| struct die_info *child_die; |
| CORE_ADDR baseaddr; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| get_scope_pc_bounds (die, &lowpc, &highpc, cu); |
| |
| /* If we didn't find a lowpc, set it to highpc to avoid complaints |
| from finish_block. */ |
| if (lowpc == ((CORE_ADDR) -1)) |
| lowpc = highpc; |
| lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); |
| |
| find_file_and_directory (die, cu, &name, &comp_dir); |
| |
| prepare_one_comp_unit (cu, die, cu->language); |
| |
| /* The XLCL doesn't generate DW_LANG_OpenCL because this attribute is not |
| standardised yet. As a workaround for the language detection we fall |
| back to the DW_AT_producer string. */ |
| if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL") != NULL) |
| cu->language = language_opencl; |
| |
| /* Similar hack for Go. */ |
| if (cu->producer && strstr (cu->producer, "GNU Go ") != NULL) |
| set_cu_language (DW_LANG_Go, cu); |
| |
| dwarf2_start_symtab (cu, name, comp_dir, lowpc); |
| |
| /* Decode line number information if present. We do this before |
| processing child DIEs, so that the line header table is available |
| for DW_AT_decl_file. */ |
| handle_DW_AT_stmt_list (die, cu, comp_dir, lowpc); |
| |
| /* Process all dies in compilation unit. */ |
| if (die->child != NULL) |
| { |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| process_die (child_die, cu); |
| child_die = sibling_die (child_die); |
| } |
| } |
| |
| /* Decode macro information, if present. Dwarf 2 macro information |
| refers to information in the line number info statement program |
| header, so we can only read it if we've read the header |
| successfully. */ |
| attr = dwarf2_attr (die, DW_AT_GNU_macros, cu); |
| if (attr && cu->line_header) |
| { |
| if (dwarf2_attr (die, DW_AT_macro_info, cu)) |
| complaint (&symfile_complaints, |
| _("CU refers to both DW_AT_GNU_macros and DW_AT_macro_info")); |
| |
| dwarf_decode_macros (cu, DW_UNSND (attr), 1); |
| } |
| else |
| { |
| attr = dwarf2_attr (die, DW_AT_macro_info, cu); |
| if (attr && cu->line_header) |
| { |
| unsigned int macro_offset = DW_UNSND (attr); |
| |
| dwarf_decode_macros (cu, macro_offset, 0); |
| } |
| } |
| |
| do_cleanups (back_to); |
| } |
| |
| /* TU version of handle_DW_AT_stmt_list for read_type_unit_scope. |
| Create the set of symtabs used by this TU, or if this TU is sharing |
| symtabs with another TU and the symtabs have already been created |
| then restore those symtabs in the line header. |
| We don't need the pc/line-number mapping for type units. */ |
| |
| static void |
| setup_type_unit_groups (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct dwarf2_per_cu_data *per_cu = cu->per_cu; |
| struct type_unit_group *tu_group; |
| int first_time; |
| struct line_header *lh; |
| struct attribute *attr; |
| unsigned int i, line_offset; |
| struct signatured_type *sig_type; |
| |
| gdb_assert (per_cu->is_debug_types); |
| sig_type = (struct signatured_type *) per_cu; |
| |
| attr = dwarf2_attr (die, DW_AT_stmt_list, cu); |
| |
| /* If we're using .gdb_index (includes -readnow) then |
| per_cu->type_unit_group may not have been set up yet. */ |
| if (sig_type->type_unit_group == NULL) |
| sig_type->type_unit_group = get_type_unit_group (cu, attr); |
| tu_group = sig_type->type_unit_group; |
| |
| /* If we've already processed this stmt_list there's no real need to |
| do it again, we could fake it and just recreate the part we need |
| (file name,index -> symtab mapping). If data shows this optimization |
| is useful we can do it then. */ |
| first_time = tu_group->compunit_symtab == NULL; |
| |
| /* We have to handle the case of both a missing DW_AT_stmt_list or bad |
| debug info. */ |
| lh = NULL; |
| if (attr != NULL) |
| { |
| line_offset = DW_UNSND (attr); |
| lh = dwarf_decode_line_header (line_offset, cu); |
| } |
| if (lh == NULL) |
| { |
| if (first_time) |
| dwarf2_start_symtab (cu, "", NULL, 0); |
| else |
| { |
| gdb_assert (tu_group->symtabs == NULL); |
| restart_symtab (tu_group->compunit_symtab, "", 0); |
| } |
| return; |
| } |
| |
| cu->line_header = lh; |
| make_cleanup (free_cu_line_header, cu); |
| |
| if (first_time) |
| { |
| struct compunit_symtab *cust = dwarf2_start_symtab (cu, "", NULL, 0); |
| |
| /* Note: We don't assign tu_group->compunit_symtab yet because we're |
| still initializing it, and our caller (a few levels up) |
| process_full_type_unit still needs to know if this is the first |
| time. */ |
| |
| tu_group->num_symtabs = lh->num_file_names; |
| tu_group->symtabs = XNEWVEC (struct symtab *, lh->num_file_names); |
| |
| for (i = 0; i < lh->num_file_names; ++i) |
| { |
| const char *dir = NULL; |
| struct file_entry *fe = &lh->file_names[i]; |
| |
| if (fe->dir_index && lh->include_dirs != NULL) |
| dir = lh->include_dirs[fe->dir_index - 1]; |
| dwarf2_start_subfile (fe->name, dir); |
| |
| if (current_subfile->symtab == NULL) |
| { |
| /* NOTE: start_subfile will recognize when it's been passed |
| a file it has already seen. So we can't assume there's a |
| simple mapping from lh->file_names to subfiles, plus |
| lh->file_names may contain dups. */ |
| current_subfile->symtab |
| = allocate_symtab (cust, current_subfile->name); |
| } |
| |
| fe->symtab = current_subfile->symtab; |
| tu_group->symtabs[i] = fe->symtab; |
| } |
| } |
| else |
| { |
| restart_symtab (tu_group->compunit_symtab, "", 0); |
| |
| for (i = 0; i < lh->num_file_names; ++i) |
| { |
| struct file_entry *fe = &lh->file_names[i]; |
| |
| fe->symtab = tu_group->symtabs[i]; |
| } |
| } |
| |
| /* The main symtab is allocated last. Type units don't have DW_AT_name |
| so they don't have a "real" (so to speak) symtab anyway. |
| There is later code that will assign the main symtab to all symbols |
| that don't have one. We need to handle the case of a symbol with a |
| missing symtab (DW_AT_decl_file) anyway. */ |
| } |
| |
| /* Process DW_TAG_type_unit. |
| For TUs we want to skip the first top level sibling if it's not the |
| actual type being defined by this TU. In this case the first top |
| level sibling is there to provide context only. */ |
| |
| static void |
| read_type_unit_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct die_info *child_die; |
| |
| prepare_one_comp_unit (cu, die, language_minimal); |
| |
| /* Initialize (or reinitialize) the machinery for building symtabs. |
| We do this before processing child DIEs, so that the line header table |
| is available for DW_AT_decl_file. */ |
| setup_type_unit_groups (die, cu); |
| |
| if (die->child != NULL) |
| { |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| process_die (child_die, cu); |
| child_die = sibling_die (child_die); |
| } |
| } |
| } |
| |
| /* DWO/DWP files. |
| |
| http://gcc.gnu.org/wiki/DebugFission |
| http://gcc.gnu.org/wiki/DebugFissionDWP |
| |
| To simplify handling of both DWO files ("object" files with the DWARF info) |
| and DWP files (a file with the DWOs packaged up into one file), we treat |
| DWP files as having a collection of virtual DWO files. */ |
| |
| static hashval_t |
| hash_dwo_file (const void *item) |
| { |
| const struct dwo_file *dwo_file = (const struct dwo_file *) item; |
| hashval_t hash; |
| |
| hash = htab_hash_string (dwo_file->dwo_name); |
| if (dwo_file->comp_dir != NULL) |
| hash += htab_hash_string (dwo_file->comp_dir); |
| return hash; |
| } |
| |
| static int |
| eq_dwo_file (const void *item_lhs, const void *item_rhs) |
| { |
| const struct dwo_file *lhs = (const struct dwo_file *) item_lhs; |
| const struct dwo_file *rhs = (const struct dwo_file *) item_rhs; |
| |
| if (strcmp (lhs->dwo_name, rhs->dwo_name) != 0) |
| return 0; |
| if (lhs->comp_dir == NULL || rhs->comp_dir == NULL) |
| return lhs->comp_dir == rhs->comp_dir; |
| return strcmp (lhs->comp_dir, rhs->comp_dir) == 0; |
| } |
| |
| /* Allocate a hash table for DWO files. */ |
| |
| static htab_t |
| allocate_dwo_file_hash_table (void) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| |
| return htab_create_alloc_ex (41, |
| hash_dwo_file, |
| eq_dwo_file, |
| NULL, |
| &objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| /* Lookup DWO file DWO_NAME. */ |
| |
| static void ** |
| lookup_dwo_file_slot (const char *dwo_name, const char *comp_dir) |
| { |
| struct dwo_file find_entry; |
| void **slot; |
| |
| if (dwarf2_per_objfile->dwo_files == NULL) |
| dwarf2_per_objfile->dwo_files = allocate_dwo_file_hash_table (); |
| |
| memset (&find_entry, 0, sizeof (find_entry)); |
| find_entry.dwo_name = dwo_name; |
| find_entry.comp_dir = comp_dir; |
| slot = htab_find_slot (dwarf2_per_objfile->dwo_files, &find_entry, INSERT); |
| |
| return slot; |
| } |
| |
| static hashval_t |
| hash_dwo_unit (const void *item) |
| { |
| const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item; |
| |
| /* This drops the top 32 bits of the id, but is ok for a hash. */ |
| return dwo_unit->signature; |
| } |
| |
| static int |
| eq_dwo_unit (const void *item_lhs, const void *item_rhs) |
| { |
| const struct dwo_unit *lhs = (const struct dwo_unit *) item_lhs; |
| const struct dwo_unit *rhs = (const struct dwo_unit *) item_rhs; |
| |
| /* The signature is assumed to be unique within the DWO file. |
| So while object file CU dwo_id's always have the value zero, |
| that's OK, assuming each object file DWO file has only one CU, |
| and that's the rule for now. */ |
| return lhs->signature == rhs->signature; |
| } |
| |
| /* Allocate a hash table for DWO CUs,TUs. |
| There is one of these tables for each of CUs,TUs for each DWO file. */ |
| |
| static htab_t |
| allocate_dwo_unit_table (struct objfile *objfile) |
| { |
| /* Start out with a pretty small number. |
| Generally DWO files contain only one CU and maybe some TUs. */ |
| return htab_create_alloc_ex (3, |
| hash_dwo_unit, |
| eq_dwo_unit, |
| NULL, |
| &objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| /* Structure used to pass data to create_dwo_debug_info_hash_table_reader. */ |
| |
| struct create_dwo_cu_data |
| { |
| struct dwo_file *dwo_file; |
| struct dwo_unit dwo_unit; |
| }; |
| |
| /* die_reader_func for create_dwo_cu. */ |
| |
| static void |
| create_dwo_cu_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *datap) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| sect_offset offset = cu->per_cu->offset; |
| struct dwarf2_section_info *section = cu->per_cu->section; |
| struct create_dwo_cu_data *data = (struct create_dwo_cu_data *) datap; |
| struct dwo_file *dwo_file = data->dwo_file; |
| struct dwo_unit *dwo_unit = &data->dwo_unit; |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (comp_unit_die, DW_AT_GNU_dwo_id, cu); |
| if (attr == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("Dwarf Error: debug entry at offset 0x%x is missing" |
| " its dwo_id [in module %s]"), |
| offset.sect_off, dwo_file->dwo_name); |
| return; |
| } |
| |
| dwo_unit->dwo_file = dwo_file; |
| dwo_unit->signature = DW_UNSND (attr); |
| dwo_unit->section = section; |
| dwo_unit->offset = offset; |
| dwo_unit->length = cu->per_cu->length; |
| |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, " offset 0x%x, dwo_id %s\n", |
| offset.sect_off, hex_string (dwo_unit->signature)); |
| } |
| |
| /* Create the dwo_unit for the lone CU in DWO_FILE. |
| Note: This function processes DWO files only, not DWP files. */ |
| |
| static struct dwo_unit * |
| create_dwo_cu (struct dwo_file *dwo_file) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_section_info *section = &dwo_file->sections.info; |
| const gdb_byte *info_ptr, *end_ptr; |
| struct create_dwo_cu_data create_dwo_cu_data; |
| struct dwo_unit *dwo_unit; |
| |
| dwarf2_read_section (objfile, section); |
| info_ptr = section->buffer; |
| |
| if (info_ptr == NULL) |
| return NULL; |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Reading %s for %s:\n", |
| get_section_name (section), |
| get_section_file_name (section)); |
| } |
| |
| create_dwo_cu_data.dwo_file = dwo_file; |
| dwo_unit = NULL; |
| |
| end_ptr = info_ptr + section->size; |
| while (info_ptr < end_ptr) |
| { |
| struct dwarf2_per_cu_data per_cu; |
| |
| memset (&create_dwo_cu_data.dwo_unit, 0, |
| sizeof (create_dwo_cu_data.dwo_unit)); |
| memset (&per_cu, 0, sizeof (per_cu)); |
| per_cu.objfile = objfile; |
| per_cu.is_debug_types = 0; |
| per_cu.offset.sect_off = info_ptr - section->buffer; |
| per_cu.section = section; |
| |
| init_cutu_and_read_dies_no_follow (&per_cu, dwo_file, |
| create_dwo_cu_reader, |
| &create_dwo_cu_data); |
| |
| if (create_dwo_cu_data.dwo_unit.dwo_file != NULL) |
| { |
| /* If we've already found one, complain. We only support one |
| because having more than one requires hacking the dwo_name of |
| each to match, which is highly unlikely to happen. */ |
| if (dwo_unit != NULL) |
| { |
| complaint (&symfile_complaints, |
| _("Multiple CUs in DWO file %s [in module %s]"), |
| dwo_file->dwo_name, objfile_name (objfile)); |
| break; |
| } |
| |
| dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); |
| *dwo_unit = create_dwo_cu_data.dwo_unit; |
| } |
| |
| info_ptr += per_cu.length; |
| } |
| |
| return dwo_unit; |
| } |
| |
| /* DWP file .debug_{cu,tu}_index section format: |
| [ref: http://gcc.gnu.org/wiki/DebugFissionDWP] |
| |
| DWP Version 1: |
| |
| Both index sections have the same format, and serve to map a 64-bit |
| signature to a set of section numbers. Each section begins with a header, |
| followed by a hash table of 64-bit signatures, a parallel table of 32-bit |
| indexes, and a pool of 32-bit section numbers. The index sections will be |
| aligned at 8-byte boundaries in the file. |
| |
| The index section header consists of: |
| |
| V, 32 bit version number |
| -, 32 bits unused |
| N, 32 bit number of compilation units or type units in the index |
| M, 32 bit number of slots in the hash table |
| |
| Numbers are recorded using the byte order of the application binary. |
| |
| The hash table begins at offset 16 in the section, and consists of an array |
| of M 64-bit slots. Each slot contains a 64-bit signature (using the byte |
| order of the application binary). Unused slots in the hash table are 0. |
| (We rely on the extreme unlikeliness of a signature being exactly 0.) |
| |
| The parallel table begins immediately after the hash table |
| (at offset 16 + 8 * M from the beginning of the section), and consists of an |
| array of 32-bit indexes (using the byte order of the application binary), |
| corresponding 1-1 with slots in the hash table. Each entry in the parallel |
| table contains a 32-bit index into the pool of section numbers. For unused |
| hash table slots, the corresponding entry in the parallel table will be 0. |
| |
| The pool of section numbers begins immediately following the hash table |
| (at offset 16 + 12 * M from the beginning of the section). The pool of |
| section numbers consists of an array of 32-bit words (using the byte order |
| of the application binary). Each item in the array is indexed starting |
| from 0. The hash table entry provides the index of the first section |
| number in the set. Additional section numbers in the set follow, and the |
| set is terminated by a 0 entry (section number 0 is not used in ELF). |
| |
| In each set of section numbers, the .debug_info.dwo or .debug_types.dwo |
| section must be the first entry in the set, and the .debug_abbrev.dwo must |
| be the second entry. Other members of the set may follow in any order. |
| |
| --- |
| |
| DWP Version 2: |
| |
| DWP Version 2 combines all the .debug_info, etc. sections into one, |
| and the entries in the index tables are now offsets into these sections. |
| CU offsets begin at 0. TU offsets begin at the size of the .debug_info |
| section. |
| |
| Index Section Contents: |
| Header |
| Hash Table of Signatures dwp_hash_table.hash_table |
| Parallel Table of Indices dwp_hash_table.unit_table |
| Table of Section Offsets dwp_hash_table.v2.{section_ids,offsets} |
| Table of Section Sizes dwp_hash_table.v2.sizes |
| |
| The index section header consists of: |
| |
| V, 32 bit version number |
| L, 32 bit number of columns in the table of section offsets |
| N, 32 bit number of compilation units or type units in the index |
| M, 32 bit number of slots in the hash table |
| |
| Numbers are recorded using the byte order of the application binary. |
| |
| The hash table has the same format as version 1. |
| The parallel table of indices has the same format as version 1, |
| except that the entries are origin-1 indices into the table of sections |
| offsets and the table of section sizes. |
| |
| The table of offsets begins immediately following the parallel table |
| (at offset 16 + 12 * M from the beginning of the section). The table is |
| a two-dimensional array of 32-bit words (using the byte order of the |
| application binary), with L columns and N+1 rows, in row-major order. |
| Each row in the array is indexed starting from 0. The first row provides |
| a key to the remaining rows: each column in this row provides an identifier |
| for a debug section, and the offsets in the same column of subsequent rows |
| refer to that section. The section identifiers are: |
| |
| DW_SECT_INFO 1 .debug_info.dwo |
| DW_SECT_TYPES 2 .debug_types.dwo |
| DW_SECT_ABBREV 3 .debug_abbrev.dwo |
| DW_SECT_LINE 4 .debug_line.dwo |
| DW_SECT_LOC 5 .debug_loc.dwo |
| DW_SECT_STR_OFFSETS 6 .debug_str_offsets.dwo |
| DW_SECT_MACINFO 7 .debug_macinfo.dwo |
| DW_SECT_MACRO 8 .debug_macro.dwo |
| |
| The offsets provided by the CU and TU index sections are the base offsets |
| for the contributions made by each CU or TU to the corresponding section |
| in the package file. Each CU and TU header contains an abbrev_offset |
| field, used to find the abbreviations table for that CU or TU within the |
| contribution to the .debug_abbrev.dwo section for that CU or TU, and should |
| be interpreted as relative to the base offset given in the index section. |
| Likewise, offsets into .debug_line.dwo from DW_AT_stmt_list attributes |
| should be interpreted as relative to the base offset for .debug_line.dwo, |
| and offsets into other debug sections obtained from DWARF attributes should |
| also be interpreted as relative to the corresponding base offset. |
| |
| The table of sizes begins immediately following the table of offsets. |
| Like the table of offsets, it is a two-dimensional array of 32-bit words, |
| with L columns and N rows, in row-major order. Each row in the array is |
| indexed starting from 1 (row 0 is shared by the two tables). |
| |
| --- |
| |
| Hash table lookup is handled the same in version 1 and 2: |
| |
| We assume that N and M will not exceed 2^32 - 1. |
| The size of the hash table, M, must be 2^k such that 2^k > 3*N/2. |
| |
| Given a 64-bit compilation unit signature or a type signature S, an entry |
| in the hash table is located as follows: |
| |
| 1) Calculate a primary hash H = S & MASK(k), where MASK(k) is a mask with |
| the low-order k bits all set to 1. |
| |
| 2) Calculate a secondary hash H' = (((S >> 32) & MASK(k)) | 1). |
| |
| 3) If the hash table entry at index H matches the signature, use that |
| entry. If the hash table entry at index H is unused (all zeroes), |
| terminate the search: the signature is not present in the table. |
| |
| 4) Let H = (H + H') modulo M. Repeat at Step 3. |
| |
| Because M > N and H' and M are relatively prime, the search is guaranteed |
| to stop at an unused slot or find the match. */ |
| |
| /* Create a hash table to map DWO IDs to their CU/TU entry in |
| .debug_{info,types}.dwo in DWP_FILE. |
| Returns NULL if there isn't one. |
| Note: This function processes DWP files only, not DWO files. */ |
| |
| static struct dwp_hash_table * |
| create_dwp_hash_table (struct dwp_file *dwp_file, int is_debug_types) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| bfd *dbfd = dwp_file->dbfd; |
| const gdb_byte *index_ptr, *index_end; |
| struct dwarf2_section_info *index; |
| uint32_t version, nr_columns, nr_units, nr_slots; |
| struct dwp_hash_table *htab; |
| |
| if (is_debug_types) |
| index = &dwp_file->sections.tu_index; |
| else |
| index = &dwp_file->sections.cu_index; |
| |
| if (dwarf2_section_empty_p (index)) |
| return NULL; |
| dwarf2_read_section (objfile, index); |
| |
| index_ptr = index->buffer; |
| index_end = index_ptr + index->size; |
| |
| version = read_4_bytes (dbfd, index_ptr); |
| index_ptr += 4; |
| if (version == 2) |
| nr_columns = read_4_bytes (dbfd, index_ptr); |
| else |
| nr_columns = 0; |
| index_ptr += 4; |
| nr_units = read_4_bytes (dbfd, index_ptr); |
| index_ptr += 4; |
| nr_slots = read_4_bytes (dbfd, index_ptr); |
| index_ptr += 4; |
| |
| if (version != 1 && version != 2) |
| { |
| error (_("Dwarf Error: unsupported DWP file version (%s)" |
| " [in module %s]"), |
| pulongest (version), dwp_file->name); |
| } |
| if (nr_slots != (nr_slots & -nr_slots)) |
| { |
| error (_("Dwarf Error: number of slots in DWP hash table (%s)" |
| " is not power of 2 [in module %s]"), |
| pulongest (nr_slots), dwp_file->name); |
| } |
| |
| htab = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_hash_table); |
| htab->version = version; |
| htab->nr_columns = nr_columns; |
| htab->nr_units = nr_units; |
| htab->nr_slots = nr_slots; |
| htab->hash_table = index_ptr; |
| htab->unit_table = htab->hash_table + sizeof (uint64_t) * nr_slots; |
| |
| /* Exit early if the table is empty. */ |
| if (nr_slots == 0 || nr_units == 0 |
| || (version == 2 && nr_columns == 0)) |
| { |
| /* All must be zero. */ |
| if (nr_slots != 0 || nr_units != 0 |
| || (version == 2 && nr_columns != 0)) |
| { |
| complaint (&symfile_complaints, |
| _("Empty DWP but nr_slots,nr_units,nr_columns not" |
| " all zero [in modules %s]"), |
| dwp_file->name); |
| } |
| return htab; |
| } |
| |
| if (version == 1) |
| { |
| htab->section_pool.v1.indices = |
| htab->unit_table + sizeof (uint32_t) * nr_slots; |
| /* It's harder to decide whether the section is too small in v1. |
| V1 is deprecated anyway so we punt. */ |
| } |
| else |
| { |
| const gdb_byte *ids_ptr = htab->unit_table + sizeof (uint32_t) * nr_slots; |
| int *ids = htab->section_pool.v2.section_ids; |
| /* Reverse map for error checking. */ |
| int ids_seen[DW_SECT_MAX + 1]; |
| int i; |
| |
| if (nr_columns < 2) |
| { |
| error (_("Dwarf Error: bad DWP hash table, too few columns" |
| " in section table [in module %s]"), |
| dwp_file->name); |
| } |
| if (nr_columns > MAX_NR_V2_DWO_SECTIONS) |
| { |
| error (_("Dwarf Error: bad DWP hash table, too many columns" |
| " in section table [in module %s]"), |
| dwp_file->name); |
| } |
| memset (ids, 255, (DW_SECT_MAX + 1) * sizeof (int32_t)); |
| memset (ids_seen, 255, (DW_SECT_MAX + 1) * sizeof (int32_t)); |
| for (i = 0; i < nr_columns; ++i) |
| { |
| int id = read_4_bytes (dbfd, ids_ptr + i * sizeof (uint32_t)); |
| |
| if (id < DW_SECT_MIN || id > DW_SECT_MAX) |
| { |
| error (_("Dwarf Error: bad DWP hash table, bad section id %d" |
| " in section table [in module %s]"), |
| id, dwp_file->name); |
| } |
| if (ids_seen[id] != -1) |
| { |
| error (_("Dwarf Error: bad DWP hash table, duplicate section" |
| " id %d in section table [in module %s]"), |
| id, dwp_file->name); |
| } |
| ids_seen[id] = i; |
| ids[i] = id; |
| } |
| /* Must have exactly one info or types section. */ |
| if (((ids_seen[DW_SECT_INFO] != -1) |
| + (ids_seen[DW_SECT_TYPES] != -1)) |
| != 1) |
| { |
| error (_("Dwarf Error: bad DWP hash table, missing/duplicate" |
| " DWO info/types section [in module %s]"), |
| dwp_file->name); |
| } |
| /* Must have an abbrev section. */ |
| if (ids_seen[DW_SECT_ABBREV] == -1) |
| { |
| error (_("Dwarf Error: bad DWP hash table, missing DWO abbrev" |
| " section [in module %s]"), |
| dwp_file->name); |
| } |
| htab->section_pool.v2.offsets = ids_ptr + sizeof (uint32_t) * nr_columns; |
| htab->section_pool.v2.sizes = |
| htab->section_pool.v2.offsets + (sizeof (uint32_t) |
| * nr_units * nr_columns); |
| if ((htab->section_pool.v2.sizes + (sizeof (uint32_t) |
| * nr_units * nr_columns)) |
| > index_end) |
| { |
| error (_("Dwarf Error: DWP index section is corrupt (too small)" |
| " [in module %s]"), |
| dwp_file->name); |
| } |
| } |
| |
| return htab; |
| } |
| |
| /* Update SECTIONS with the data from SECTP. |
| |
| This function is like the other "locate" section routines that are |
| passed to bfd_map_over_sections, but in this context the sections to |
| read comes from the DWP V1 hash table, not the full ELF section table. |
| |
| The result is non-zero for success, or zero if an error was found. */ |
| |
| static int |
| locate_v1_virtual_dwo_sections (asection *sectp, |
| struct virtual_v1_dwo_sections *sections) |
| { |
| const struct dwop_section_names *names = &dwop_section_names; |
| |
| if (section_is_p (sectp->name, &names->abbrev_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->abbrev.s.section != NULL) |
| return 0; |
| sections->abbrev.s.section = sectp; |
| sections->abbrev.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->info_dwo) |
| || section_is_p (sectp->name, &names->types_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->info_or_types.s.section != NULL) |
| return 0; |
| sections->info_or_types.s.section = sectp; |
| sections->info_or_types.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->line_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->line.s.section != NULL) |
| return 0; |
| sections->line.s.section = sectp; |
| sections->line.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->loc_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->loc.s.section != NULL) |
| return 0; |
| sections->loc.s.section = sectp; |
| sections->loc.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macinfo_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->macinfo.s.section != NULL) |
| return 0; |
| sections->macinfo.s.section = sectp; |
| sections->macinfo.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macro_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->macro.s.section != NULL) |
| return 0; |
| sections->macro.s.section = sectp; |
| sections->macro.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->str_offsets_dwo)) |
| { |
| /* There can be only one. */ |
| if (sections->str_offsets.s.section != NULL) |
| return 0; |
| sections->str_offsets.s.section = sectp; |
| sections->str_offsets.size = bfd_get_section_size (sectp); |
| } |
| else |
| { |
| /* No other kind of section is valid. */ |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* Create a dwo_unit object for the DWO unit with signature SIGNATURE. |
| UNIT_INDEX is the index of the DWO unit in the DWP hash table. |
| COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. |
| This is for DWP version 1 files. */ |
| |
| static struct dwo_unit * |
| create_dwo_unit_in_dwp_v1 (struct dwp_file *dwp_file, |
| uint32_t unit_index, |
| const char *comp_dir, |
| ULONGEST signature, int is_debug_types) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| const struct dwp_hash_table *dwp_htab = |
| is_debug_types ? dwp_file->tus : dwp_file->cus; |
| bfd *dbfd = dwp_file->dbfd; |
| const char *kind = is_debug_types ? "TU" : "CU"; |
| struct dwo_file *dwo_file; |
| struct dwo_unit *dwo_unit; |
| struct virtual_v1_dwo_sections sections; |
| void **dwo_file_slot; |
| char *virtual_dwo_name; |
| struct cleanup *cleanups; |
| int i; |
| |
| gdb_assert (dwp_file->version == 1); |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V1 file: %s\n", |
| kind, |
| pulongest (unit_index), hex_string (signature), |
| dwp_file->name); |
| } |
| |
| /* Fetch the sections of this DWO unit. |
| Put a limit on the number of sections we look for so that bad data |
| doesn't cause us to loop forever. */ |
| |
| #define MAX_NR_V1_DWO_SECTIONS \ |
| (1 /* .debug_info or .debug_types */ \ |
| + 1 /* .debug_abbrev */ \ |
| + 1 /* .debug_line */ \ |
| + 1 /* .debug_loc */ \ |
| + 1 /* .debug_str_offsets */ \ |
| + 1 /* .debug_macro or .debug_macinfo */ \ |
| + 1 /* trailing zero */) |
| |
| memset (§ions, 0, sizeof (sections)); |
| cleanups = make_cleanup (null_cleanup, 0); |
| |
| for (i = 0; i < MAX_NR_V1_DWO_SECTIONS; ++i) |
| { |
| asection *sectp; |
| uint32_t section_nr = |
| read_4_bytes (dbfd, |
| dwp_htab->section_pool.v1.indices |
| + (unit_index + i) * sizeof (uint32_t)); |
| |
| if (section_nr == 0) |
| break; |
| if (section_nr >= dwp_file->num_sections) |
| { |
| error (_("Dwarf Error: bad DWP hash table, section number too large" |
| " [in module %s]"), |
| dwp_file->name); |
| } |
| |
| sectp = dwp_file->elf_sections[section_nr]; |
| if (! locate_v1_virtual_dwo_sections (sectp, §ions)) |
| { |
| error (_("Dwarf Error: bad DWP hash table, invalid section found" |
| " [in module %s]"), |
| dwp_file->name); |
| } |
| } |
| |
| if (i < 2 |
| || dwarf2_section_empty_p (§ions.info_or_types) |
| || dwarf2_section_empty_p (§ions.abbrev)) |
| { |
| error (_("Dwarf Error: bad DWP hash table, missing DWO sections" |
| " [in module %s]"), |
| dwp_file->name); |
| } |
| if (i == MAX_NR_V1_DWO_SECTIONS) |
| { |
| error (_("Dwarf Error: bad DWP hash table, too many DWO sections" |
| " [in module %s]"), |
| dwp_file->name); |
| } |
| |
| /* It's easier for the rest of the code if we fake a struct dwo_file and |
| have dwo_unit "live" in that. At least for now. |
| |
| The DWP file can be made up of a random collection of CUs and TUs. |
| However, for each CU + set of TUs that came from the same original DWO |
| file, we can combine them back into a virtual DWO file to save space |
| (fewer struct dwo_file objects to allocate). Remember that for really |
| large apps there can be on the order of 8K CUs and 200K TUs, or more. */ |
| |
| virtual_dwo_name = |
| xstrprintf ("virtual-dwo/%d-%d-%d-%d", |
| get_section_id (§ions.abbrev), |
| get_section_id (§ions.line), |
| get_section_id (§ions.loc), |
| get_section_id (§ions.str_offsets)); |
| make_cleanup (xfree, virtual_dwo_name); |
| /* Can we use an existing virtual DWO file? */ |
| dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir); |
| /* Create one if necessary. */ |
| if (*dwo_file_slot == NULL) |
| { |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", |
| virtual_dwo_name); |
| } |
| dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file); |
| dwo_file->dwo_name |
| = (const char *) obstack_copy0 (&objfile->objfile_obstack, |
| virtual_dwo_name, |
| strlen (virtual_dwo_name)); |
| dwo_file->comp_dir = comp_dir; |
| dwo_file->sections.abbrev = sections.abbrev; |
| dwo_file->sections.line = sections.line; |
| dwo_file->sections.loc = sections.loc; |
| dwo_file->sections.macinfo = sections.macinfo; |
| dwo_file->sections.macro = sections.macro; |
| dwo_file->sections.str_offsets = sections.str_offsets; |
| /* The "str" section is global to the entire DWP file. */ |
| dwo_file->sections.str = dwp_file->sections.str; |
| /* The info or types section is assigned below to dwo_unit, |
| there's no need to record it in dwo_file. |
| Also, we can't simply record type sections in dwo_file because |
| we record a pointer into the vector in dwo_unit. As we collect more |
| types we'll grow the vector and eventually have to reallocate space |
| for it, invalidating all copies of pointers into the previous |
| contents. */ |
| *dwo_file_slot = dwo_file; |
| } |
| else |
| { |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", |
| virtual_dwo_name); |
| } |
| dwo_file = (struct dwo_file *) *dwo_file_slot; |
| } |
| do_cleanups (cleanups); |
| |
| dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); |
| dwo_unit->dwo_file = dwo_file; |
| dwo_unit->signature = signature; |
| dwo_unit->section = |
| XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info); |
| *dwo_unit->section = sections.info_or_types; |
| /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ |
| |
| return dwo_unit; |
| } |
| |
| /* Subroutine of create_dwo_unit_in_dwp_v2 to simplify it. |
| Given a pointer to the containing section SECTION, and OFFSET,SIZE of the |
| piece within that section used by a TU/CU, return a virtual section |
| of just that piece. */ |
| |
| static struct dwarf2_section_info |
| create_dwp_v2_section (struct dwarf2_section_info *section, |
| bfd_size_type offset, bfd_size_type size) |
| { |
| struct dwarf2_section_info result; |
| asection *sectp; |
| |
| gdb_assert (section != NULL); |
| gdb_assert (!section->is_virtual); |
| |
| memset (&result, 0, sizeof (result)); |
| result.s.containing_section = section; |
| result.is_virtual = 1; |
| |
| if (size == 0) |
| return result; |
| |
| sectp = get_section_bfd_section (section); |
| |
| /* Flag an error if the piece denoted by OFFSET,SIZE is outside the |
| bounds of the real section. This is a pretty-rare event, so just |
| flag an error (easier) instead of a warning and trying to cope. */ |
| if (sectp == NULL |
| || offset + size > bfd_get_section_size (sectp)) |
| { |
| bfd *abfd = sectp->owner; |
| |
| error (_("Dwarf Error: Bad DWP V2 section info, doesn't fit" |
| " in section %s [in module %s]"), |
| sectp ? bfd_section_name (abfd, sectp) : "<unknown>", |
| objfile_name (dwarf2_per_objfile->objfile)); |
| } |
| |
| result.virtual_offset = offset; |
| result.size = size; |
| return result; |
| } |
| |
| /* Create a dwo_unit object for the DWO unit with signature SIGNATURE. |
| UNIT_INDEX is the index of the DWO unit in the DWP hash table. |
| COMP_DIR is the DW_AT_comp_dir attribute of the referencing CU. |
| This is for DWP version 2 files. */ |
| |
| static struct dwo_unit * |
| create_dwo_unit_in_dwp_v2 (struct dwp_file *dwp_file, |
| uint32_t unit_index, |
| const char *comp_dir, |
| ULONGEST signature, int is_debug_types) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| const struct dwp_hash_table *dwp_htab = |
| is_debug_types ? dwp_file->tus : dwp_file->cus; |
| bfd *dbfd = dwp_file->dbfd; |
| const char *kind = is_debug_types ? "TU" : "CU"; |
| struct dwo_file *dwo_file; |
| struct dwo_unit *dwo_unit; |
| struct virtual_v2_dwo_sections sections; |
| void **dwo_file_slot; |
| char *virtual_dwo_name; |
| struct cleanup *cleanups; |
| int i; |
| |
| gdb_assert (dwp_file->version == 2); |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Reading %s %s/%s in DWP V2 file: %s\n", |
| kind, |
| pulongest (unit_index), hex_string (signature), |
| dwp_file->name); |
| } |
| |
| /* Fetch the section offsets of this DWO unit. */ |
| |
| memset (§ions, 0, sizeof (sections)); |
| cleanups = make_cleanup (null_cleanup, 0); |
| |
| for (i = 0; i < dwp_htab->nr_columns; ++i) |
| { |
| uint32_t offset = read_4_bytes (dbfd, |
| dwp_htab->section_pool.v2.offsets |
| + (((unit_index - 1) * dwp_htab->nr_columns |
| + i) |
| * sizeof (uint32_t))); |
| uint32_t size = read_4_bytes (dbfd, |
| dwp_htab->section_pool.v2.sizes |
| + (((unit_index - 1) * dwp_htab->nr_columns |
| + i) |
| * sizeof (uint32_t))); |
| |
| switch (dwp_htab->section_pool.v2.section_ids[i]) |
| { |
| case DW_SECT_INFO: |
| case DW_SECT_TYPES: |
| sections.info_or_types_offset = offset; |
| sections.info_or_types_size = size; |
| break; |
| case DW_SECT_ABBREV: |
| sections.abbrev_offset = offset; |
| sections.abbrev_size = size; |
| break; |
| case DW_SECT_LINE: |
| sections.line_offset = offset; |
| sections.line_size = size; |
| break; |
| case DW_SECT_LOC: |
| sections.loc_offset = offset; |
| sections.loc_size = size; |
| break; |
| case DW_SECT_STR_OFFSETS: |
| sections.str_offsets_offset = offset; |
| sections.str_offsets_size = size; |
| break; |
| case DW_SECT_MACINFO: |
| sections.macinfo_offset = offset; |
| sections.macinfo_size = size; |
| break; |
| case DW_SECT_MACRO: |
| sections.macro_offset = offset; |
| sections.macro_size = size; |
| break; |
| } |
| } |
| |
| /* It's easier for the rest of the code if we fake a struct dwo_file and |
| have dwo_unit "live" in that. At least for now. |
| |
| The DWP file can be made up of a random collection of CUs and TUs. |
| However, for each CU + set of TUs that came from the same original DWO |
| file, we can combine them back into a virtual DWO file to save space |
| (fewer struct dwo_file objects to allocate). Remember that for really |
| large apps there can be on the order of 8K CUs and 200K TUs, or more. */ |
| |
| virtual_dwo_name = |
| xstrprintf ("virtual-dwo/%ld-%ld-%ld-%ld", |
| (long) (sections.abbrev_size ? sections.abbrev_offset : 0), |
| (long) (sections.line_size ? sections.line_offset : 0), |
| (long) (sections.loc_size ? sections.loc_offset : 0), |
| (long) (sections.str_offsets_size |
| ? sections.str_offsets_offset : 0)); |
| make_cleanup (xfree, virtual_dwo_name); |
| /* Can we use an existing virtual DWO file? */ |
| dwo_file_slot = lookup_dwo_file_slot (virtual_dwo_name, comp_dir); |
| /* Create one if necessary. */ |
| if (*dwo_file_slot == NULL) |
| { |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Creating virtual DWO: %s\n", |
| virtual_dwo_name); |
| } |
| dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file); |
| dwo_file->dwo_name |
| = (const char *) obstack_copy0 (&objfile->objfile_obstack, |
| virtual_dwo_name, |
| strlen (virtual_dwo_name)); |
| dwo_file->comp_dir = comp_dir; |
| dwo_file->sections.abbrev = |
| create_dwp_v2_section (&dwp_file->sections.abbrev, |
| sections.abbrev_offset, sections.abbrev_size); |
| dwo_file->sections.line = |
| create_dwp_v2_section (&dwp_file->sections.line, |
| sections.line_offset, sections.line_size); |
| dwo_file->sections.loc = |
| create_dwp_v2_section (&dwp_file->sections.loc, |
| sections.loc_offset, sections.loc_size); |
| dwo_file->sections.macinfo = |
| create_dwp_v2_section (&dwp_file->sections.macinfo, |
| sections.macinfo_offset, sections.macinfo_size); |
| dwo_file->sections.macro = |
| create_dwp_v2_section (&dwp_file->sections.macro, |
| sections.macro_offset, sections.macro_size); |
| dwo_file->sections.str_offsets = |
| create_dwp_v2_section (&dwp_file->sections.str_offsets, |
| sections.str_offsets_offset, |
| sections.str_offsets_size); |
| /* The "str" section is global to the entire DWP file. */ |
| dwo_file->sections.str = dwp_file->sections.str; |
| /* The info or types section is assigned below to dwo_unit, |
| there's no need to record it in dwo_file. |
| Also, we can't simply record type sections in dwo_file because |
| we record a pointer into the vector in dwo_unit. As we collect more |
| types we'll grow the vector and eventually have to reallocate space |
| for it, invalidating all copies of pointers into the previous |
| contents. */ |
| *dwo_file_slot = dwo_file; |
| } |
| else |
| { |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "Using existing virtual DWO: %s\n", |
| virtual_dwo_name); |
| } |
| dwo_file = (struct dwo_file *) *dwo_file_slot; |
| } |
| do_cleanups (cleanups); |
| |
| dwo_unit = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_unit); |
| dwo_unit->dwo_file = dwo_file; |
| dwo_unit->signature = signature; |
| dwo_unit->section = |
| XOBNEW (&objfile->objfile_obstack, struct dwarf2_section_info); |
| *dwo_unit->section = create_dwp_v2_section (is_debug_types |
| ? &dwp_file->sections.types |
| : &dwp_file->sections.info, |
| sections.info_or_types_offset, |
| sections.info_or_types_size); |
| /* dwo_unit->{offset,length,type_offset_in_tu} are set later. */ |
| |
| return dwo_unit; |
| } |
| |
| /* Lookup the DWO unit with SIGNATURE in DWP_FILE. |
| Returns NULL if the signature isn't found. */ |
| |
| static struct dwo_unit * |
| lookup_dwo_unit_in_dwp (struct dwp_file *dwp_file, const char *comp_dir, |
| ULONGEST signature, int is_debug_types) |
| { |
| const struct dwp_hash_table *dwp_htab = |
| is_debug_types ? dwp_file->tus : dwp_file->cus; |
| bfd *dbfd = dwp_file->dbfd; |
| uint32_t mask = dwp_htab->nr_slots - 1; |
| uint32_t hash = signature & mask; |
| uint32_t hash2 = ((signature >> 32) & mask) | 1; |
| unsigned int i; |
| void **slot; |
| struct dwo_unit find_dwo_cu; |
| |
| memset (&find_dwo_cu, 0, sizeof (find_dwo_cu)); |
| find_dwo_cu.signature = signature; |
| slot = htab_find_slot (is_debug_types |
| ? dwp_file->loaded_tus |
| : dwp_file->loaded_cus, |
| &find_dwo_cu, INSERT); |
| |
| if (*slot != NULL) |
| return (struct dwo_unit *) *slot; |
| |
| /* Use a for loop so that we don't loop forever on bad debug info. */ |
| for (i = 0; i < dwp_htab->nr_slots; ++i) |
| { |
| ULONGEST signature_in_table; |
| |
| signature_in_table = |
| read_8_bytes (dbfd, dwp_htab->hash_table + hash * sizeof (uint64_t)); |
| if (signature_in_table == signature) |
| { |
| uint32_t unit_index = |
| read_4_bytes (dbfd, |
| dwp_htab->unit_table + hash * sizeof (uint32_t)); |
| |
| if (dwp_file->version == 1) |
| { |
| *slot = create_dwo_unit_in_dwp_v1 (dwp_file, unit_index, |
| comp_dir, signature, |
| is_debug_types); |
| } |
| else |
| { |
| *slot = create_dwo_unit_in_dwp_v2 (dwp_file, unit_index, |
| comp_dir, signature, |
| is_debug_types); |
| } |
| return (struct dwo_unit *) *slot; |
| } |
| if (signature_in_table == 0) |
| return NULL; |
| hash = (hash + hash2) & mask; |
| } |
| |
| error (_("Dwarf Error: bad DWP hash table, lookup didn't terminate" |
| " [in module %s]"), |
| dwp_file->name); |
| } |
| |
| /* Subroutine of open_dwo_file,open_dwp_file to simplify them. |
| Open the file specified by FILE_NAME and hand it off to BFD for |
| preliminary analysis. Return a newly initialized bfd *, which |
| includes a canonicalized copy of FILE_NAME. |
| If IS_DWP is TRUE, we're opening a DWP file, otherwise a DWO file. |
| SEARCH_CWD is true if the current directory is to be searched. |
| It will be searched before debug-file-directory. |
| If successful, the file is added to the bfd include table of the |
| objfile's bfd (see gdb_bfd_record_inclusion). |
| If unable to find/open the file, return NULL. |
| NOTE: This function is derived from symfile_bfd_open. */ |
| |
| static bfd * |
| try_open_dwop_file (const char *file_name, int is_dwp, int search_cwd) |
| { |
| bfd *sym_bfd; |
| int desc, flags; |
| char *absolute_name; |
| /* Blech. OPF_TRY_CWD_FIRST also disables searching the path list if |
| FILE_NAME contains a '/'. So we can't use it. Instead prepend "." |
| to debug_file_directory. */ |
| char *search_path; |
| static const char dirname_separator_string[] = { DIRNAME_SEPARATOR, '\0' }; |
| |
| if (search_cwd) |
| { |
| if (*debug_file_directory != '\0') |
| search_path = concat (".", dirname_separator_string, |
| debug_file_directory, (char *) NULL); |
| else |
| search_path = xstrdup ("."); |
| } |
| else |
| search_path = xstrdup (debug_file_directory); |
| |
| flags = OPF_RETURN_REALPATH; |
| if (is_dwp) |
| flags |= OPF_SEARCH_IN_PATH; |
| desc = openp (search_path, flags, file_name, |
| O_RDONLY | O_BINARY, &absolute_name); |
| xfree (search_path); |
| if (desc < 0) |
| return NULL; |
| |
| sym_bfd = gdb_bfd_open (absolute_name, gnutarget, desc); |
| xfree (absolute_name); |
| if (sym_bfd == NULL) |
| return NULL; |
| bfd_set_cacheable (sym_bfd, 1); |
| |
| if (!bfd_check_format (sym_bfd, bfd_object)) |
| { |
| gdb_bfd_unref (sym_bfd); /* This also closes desc. */ |
| return NULL; |
| } |
| |
| /* Success. Record the bfd as having been included by the objfile's bfd. |
| This is important because things like demangled_names_hash lives in the |
| objfile's per_bfd space and may have references to things like symbol |
| names that live in the DWO/DWP file's per_bfd space. PR 16426. */ |
| gdb_bfd_record_inclusion (dwarf2_per_objfile->objfile->obfd, sym_bfd); |
| |
| return sym_bfd; |
| } |
| |
| /* Try to open DWO file FILE_NAME. |
| COMP_DIR is the DW_AT_comp_dir attribute. |
| The result is the bfd handle of the file. |
| If there is a problem finding or opening the file, return NULL. |
| Upon success, the canonicalized path of the file is stored in the bfd, |
| same as symfile_bfd_open. */ |
| |
| static bfd * |
| open_dwo_file (const char *file_name, const char *comp_dir) |
| { |
| bfd *abfd; |
| |
| if (IS_ABSOLUTE_PATH (file_name)) |
| return try_open_dwop_file (file_name, 0 /*is_dwp*/, 0 /*search_cwd*/); |
| |
| /* Before trying the search path, try DWO_NAME in COMP_DIR. */ |
| |
| if (comp_dir != NULL) |
| { |
| char *path_to_try = concat (comp_dir, SLASH_STRING, |
| file_name, (char *) NULL); |
| |
| /* NOTE: If comp_dir is a relative path, this will also try the |
| search path, which seems useful. */ |
| abfd = try_open_dwop_file (path_to_try, 0 /*is_dwp*/, 1 /*search_cwd*/); |
| xfree (path_to_try); |
| if (abfd != NULL) |
| return abfd; |
| } |
| |
| /* That didn't work, try debug-file-directory, which, despite its name, |
| is a list of paths. */ |
| |
| if (*debug_file_directory == '\0') |
| return NULL; |
| |
| return try_open_dwop_file (file_name, 0 /*is_dwp*/, 1 /*search_cwd*/); |
| } |
| |
| /* This function is mapped across the sections and remembers the offset and |
| size of each of the DWO debugging sections we are interested in. */ |
| |
| static void |
| dwarf2_locate_dwo_sections (bfd *abfd, asection *sectp, void *dwo_sections_ptr) |
| { |
| struct dwo_sections *dwo_sections = (struct dwo_sections *) dwo_sections_ptr; |
| const struct dwop_section_names *names = &dwop_section_names; |
| |
| if (section_is_p (sectp->name, &names->abbrev_dwo)) |
| { |
| dwo_sections->abbrev.s.section = sectp; |
| dwo_sections->abbrev.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->info_dwo)) |
| { |
| dwo_sections->info.s.section = sectp; |
| dwo_sections->info.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->line_dwo)) |
| { |
| dwo_sections->line.s.section = sectp; |
| dwo_sections->line.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->loc_dwo)) |
| { |
| dwo_sections->loc.s.section = sectp; |
| dwo_sections->loc.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macinfo_dwo)) |
| { |
| dwo_sections->macinfo.s.section = sectp; |
| dwo_sections->macinfo.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macro_dwo)) |
| { |
| dwo_sections->macro.s.section = sectp; |
| dwo_sections->macro.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->str_dwo)) |
| { |
| dwo_sections->str.s.section = sectp; |
| dwo_sections->str.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->str_offsets_dwo)) |
| { |
| dwo_sections->str_offsets.s.section = sectp; |
| dwo_sections->str_offsets.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->types_dwo)) |
| { |
| struct dwarf2_section_info type_section; |
| |
| memset (&type_section, 0, sizeof (type_section)); |
| type_section.s.section = sectp; |
| type_section.size = bfd_get_section_size (sectp); |
| VEC_safe_push (dwarf2_section_info_def, dwo_sections->types, |
| &type_section); |
| } |
| } |
| |
| /* Initialize the use of the DWO file specified by DWO_NAME and referenced |
| by PER_CU. This is for the non-DWP case. |
| The result is NULL if DWO_NAME can't be found. */ |
| |
| static struct dwo_file * |
| open_and_init_dwo_file (struct dwarf2_per_cu_data *per_cu, |
| const char *dwo_name, const char *comp_dir) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwo_file *dwo_file; |
| bfd *dbfd; |
| struct cleanup *cleanups; |
| |
| dbfd = open_dwo_file (dwo_name, comp_dir); |
| if (dbfd == NULL) |
| { |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "DWO file not found: %s\n", dwo_name); |
| return NULL; |
| } |
| dwo_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwo_file); |
| dwo_file->dwo_name = dwo_name; |
| dwo_file->comp_dir = comp_dir; |
| dwo_file->dbfd = dbfd; |
| |
| cleanups = make_cleanup (free_dwo_file_cleanup, dwo_file); |
| |
| bfd_map_over_sections (dbfd, dwarf2_locate_dwo_sections, &dwo_file->sections); |
| |
| dwo_file->cu = create_dwo_cu (dwo_file); |
| |
| dwo_file->tus = create_debug_types_hash_table (dwo_file, |
| dwo_file->sections.types); |
| |
| discard_cleanups (cleanups); |
| |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "DWO file found: %s\n", dwo_name); |
| |
| return dwo_file; |
| } |
| |
| /* This function is mapped across the sections and remembers the offset and |
| size of each of the DWP debugging sections common to version 1 and 2 that |
| we are interested in. */ |
| |
| static void |
| dwarf2_locate_common_dwp_sections (bfd *abfd, asection *sectp, |
| void *dwp_file_ptr) |
| { |
| struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; |
| const struct dwop_section_names *names = &dwop_section_names; |
| unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; |
| |
| /* Record the ELF section number for later lookup: this is what the |
| .debug_cu_index,.debug_tu_index tables use in DWP V1. */ |
| gdb_assert (elf_section_nr < dwp_file->num_sections); |
| dwp_file->elf_sections[elf_section_nr] = sectp; |
| |
| /* Look for specific sections that we need. */ |
| if (section_is_p (sectp->name, &names->str_dwo)) |
| { |
| dwp_file->sections.str.s.section = sectp; |
| dwp_file->sections.str.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->cu_index)) |
| { |
| dwp_file->sections.cu_index.s.section = sectp; |
| dwp_file->sections.cu_index.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->tu_index)) |
| { |
| dwp_file->sections.tu_index.s.section = sectp; |
| dwp_file->sections.tu_index.size = bfd_get_section_size (sectp); |
| } |
| } |
| |
| /* This function is mapped across the sections and remembers the offset and |
| size of each of the DWP version 2 debugging sections that we are interested |
| in. This is split into a separate function because we don't know if we |
| have version 1 or 2 until we parse the cu_index/tu_index sections. */ |
| |
| static void |
| dwarf2_locate_v2_dwp_sections (bfd *abfd, asection *sectp, void *dwp_file_ptr) |
| { |
| struct dwp_file *dwp_file = (struct dwp_file *) dwp_file_ptr; |
| const struct dwop_section_names *names = &dwop_section_names; |
| unsigned int elf_section_nr = elf_section_data (sectp)->this_idx; |
| |
| /* Record the ELF section number for later lookup: this is what the |
| .debug_cu_index,.debug_tu_index tables use in DWP V1. */ |
| gdb_assert (elf_section_nr < dwp_file->num_sections); |
| dwp_file->elf_sections[elf_section_nr] = sectp; |
| |
| /* Look for specific sections that we need. */ |
| if (section_is_p (sectp->name, &names->abbrev_dwo)) |
| { |
| dwp_file->sections.abbrev.s.section = sectp; |
| dwp_file->sections.abbrev.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->info_dwo)) |
| { |
| dwp_file->sections.info.s.section = sectp; |
| dwp_file->sections.info.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->line_dwo)) |
| { |
| dwp_file->sections.line.s.section = sectp; |
| dwp_file->sections.line.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->loc_dwo)) |
| { |
| dwp_file->sections.loc.s.section = sectp; |
| dwp_file->sections.loc.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macinfo_dwo)) |
| { |
| dwp_file->sections.macinfo.s.section = sectp; |
| dwp_file->sections.macinfo.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->macro_dwo)) |
| { |
| dwp_file->sections.macro.s.section = sectp; |
| dwp_file->sections.macro.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->str_offsets_dwo)) |
| { |
| dwp_file->sections.str_offsets.s.section = sectp; |
| dwp_file->sections.str_offsets.size = bfd_get_section_size (sectp); |
| } |
| else if (section_is_p (sectp->name, &names->types_dwo)) |
| { |
| dwp_file->sections.types.s.section = sectp; |
| dwp_file->sections.types.size = bfd_get_section_size (sectp); |
| } |
| } |
| |
| /* Hash function for dwp_file loaded CUs/TUs. */ |
| |
| static hashval_t |
| hash_dwp_loaded_cutus (const void *item) |
| { |
| const struct dwo_unit *dwo_unit = (const struct dwo_unit *) item; |
| |
| /* This drops the top 32 bits of the signature, but is ok for a hash. */ |
| return dwo_unit->signature; |
| } |
| |
| /* Equality function for dwp_file loaded CUs/TUs. */ |
| |
| static int |
| eq_dwp_loaded_cutus (const void *a, const void *b) |
| { |
| const struct dwo_unit *dua = (const struct dwo_unit *) a; |
| const struct dwo_unit *dub = (const struct dwo_unit *) b; |
| |
| return dua->signature == dub->signature; |
| } |
| |
| /* Allocate a hash table for dwp_file loaded CUs/TUs. */ |
| |
| static htab_t |
| allocate_dwp_loaded_cutus_table (struct objfile *objfile) |
| { |
| return htab_create_alloc_ex (3, |
| hash_dwp_loaded_cutus, |
| eq_dwp_loaded_cutus, |
| NULL, |
| &objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| /* Try to open DWP file FILE_NAME. |
| The result is the bfd handle of the file. |
| If there is a problem finding or opening the file, return NULL. |
| Upon success, the canonicalized path of the file is stored in the bfd, |
| same as symfile_bfd_open. */ |
| |
| static bfd * |
| open_dwp_file (const char *file_name) |
| { |
| bfd *abfd; |
| |
| abfd = try_open_dwop_file (file_name, 1 /*is_dwp*/, 1 /*search_cwd*/); |
| if (abfd != NULL) |
| return abfd; |
| |
| /* Work around upstream bug 15652. |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15652 |
| [Whether that's a "bug" is debatable, but it is getting in our way.] |
| We have no real idea where the dwp file is, because gdb's realpath-ing |
| of the executable's path may have discarded the needed info. |
| [IWBN if the dwp file name was recorded in the executable, akin to |
| .gnu_debuglink, but that doesn't exist yet.] |
| Strip the directory from FILE_NAME and search again. */ |
| if (*debug_file_directory != '\0') |
| { |
| /* Don't implicitly search the current directory here. |
| If the user wants to search "." to handle this case, |
| it must be added to debug-file-directory. */ |
| return try_open_dwop_file (lbasename (file_name), 1 /*is_dwp*/, |
| 0 /*search_cwd*/); |
| } |
| |
| return NULL; |
| } |
| |
| /* Initialize the use of the DWP file for the current objfile. |
| By convention the name of the DWP file is ${objfile}.dwp. |
| The result is NULL if it can't be found. */ |
| |
| static struct dwp_file * |
| open_and_init_dwp_file (void) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwp_file *dwp_file; |
| char *dwp_name; |
| bfd *dbfd; |
| struct cleanup *cleanups = make_cleanup (null_cleanup, 0); |
| |
| /* Try to find first .dwp for the binary file before any symbolic links |
| resolving. */ |
| |
| /* If the objfile is a debug file, find the name of the real binary |
| file and get the name of dwp file from there. */ |
| if (objfile->separate_debug_objfile_backlink != NULL) |
| { |
| struct objfile *backlink = objfile->separate_debug_objfile_backlink; |
| const char *backlink_basename = lbasename (backlink->original_name); |
| char *debug_dirname = ldirname (objfile->original_name); |
| |
| make_cleanup (xfree, debug_dirname); |
| dwp_name = xstrprintf ("%s%s%s.dwp", debug_dirname, |
| SLASH_STRING, backlink_basename); |
| } |
| else |
| dwp_name = xstrprintf ("%s.dwp", objfile->original_name); |
| make_cleanup (xfree, dwp_name); |
| |
| dbfd = open_dwp_file (dwp_name); |
| if (dbfd == NULL |
| && strcmp (objfile->original_name, objfile_name (objfile)) != 0) |
| { |
| /* Try to find .dwp for the binary file after gdb_realpath resolving. */ |
| dwp_name = xstrprintf ("%s.dwp", objfile_name (objfile)); |
| make_cleanup (xfree, dwp_name); |
| dbfd = open_dwp_file (dwp_name); |
| } |
| |
| if (dbfd == NULL) |
| { |
| if (dwarf_read_debug) |
| fprintf_unfiltered (gdb_stdlog, "DWP file not found: %s\n", dwp_name); |
| do_cleanups (cleanups); |
| return NULL; |
| } |
| dwp_file = OBSTACK_ZALLOC (&objfile->objfile_obstack, struct dwp_file); |
| dwp_file->name = bfd_get_filename (dbfd); |
| dwp_file->dbfd = dbfd; |
| do_cleanups (cleanups); |
| |
| /* +1: section 0 is unused */ |
| dwp_file->num_sections = bfd_count_sections (dbfd) + 1; |
| dwp_file->elf_sections = |
| OBSTACK_CALLOC (&objfile->objfile_obstack, |
| dwp_file->num_sections, asection *); |
| |
| bfd_map_over_sections (dbfd, dwarf2_locate_common_dwp_sections, dwp_file); |
| |
| dwp_file->cus = create_dwp_hash_table (dwp_file, 0); |
| |
| dwp_file->tus = create_dwp_hash_table (dwp_file, 1); |
| |
| /* The DWP file version is stored in the hash table. Oh well. */ |
| if (dwp_file->cus->version != dwp_file->tus->version) |
| { |
| /* Technically speaking, we should try to limp along, but this is |
| pretty bizarre. We use pulongest here because that's the established |
| portability solution (e.g, we cannot use %u for uint32_t). */ |
| error (_("Dwarf Error: DWP file CU version %s doesn't match" |
| " TU version %s [in DWP file %s]"), |
| pulongest (dwp_file->cus->version), |
| pulongest (dwp_file->tus->version), dwp_name); |
| } |
| dwp_file->version = dwp_file->cus->version; |
| |
| if (dwp_file->version == 2) |
| bfd_map_over_sections (dbfd, dwarf2_locate_v2_dwp_sections, dwp_file); |
| |
| dwp_file->loaded_cus = allocate_dwp_loaded_cutus_table (objfile); |
| dwp_file->loaded_tus = allocate_dwp_loaded_cutus_table (objfile); |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "DWP file found: %s\n", dwp_file->name); |
| fprintf_unfiltered (gdb_stdlog, |
| " %s CUs, %s TUs\n", |
| pulongest (dwp_file->cus ? dwp_file->cus->nr_units : 0), |
| pulongest (dwp_file->tus ? dwp_file->tus->nr_units : 0)); |
| } |
| |
| return dwp_file; |
| } |
| |
| /* Wrapper around open_and_init_dwp_file, only open it once. */ |
| |
| static struct dwp_file * |
| get_dwp_file (void) |
| { |
| if (! dwarf2_per_objfile->dwp_checked) |
| { |
| dwarf2_per_objfile->dwp_file = open_and_init_dwp_file (); |
| dwarf2_per_objfile->dwp_checked = 1; |
| } |
| return dwarf2_per_objfile->dwp_file; |
| } |
| |
| /* Subroutine of lookup_dwo_comp_unit, lookup_dwo_type_unit. |
| Look up the CU/TU with signature SIGNATURE, either in DWO file DWO_NAME |
| or in the DWP file for the objfile, referenced by THIS_UNIT. |
| If non-NULL, comp_dir is the DW_AT_comp_dir attribute. |
| IS_DEBUG_TYPES is non-zero if reading a TU, otherwise read a CU. |
| |
| This is called, for example, when wanting to read a variable with a |
| complex location. Therefore we don't want to do file i/o for every call. |
| Therefore we don't want to look for a DWO file on every call. |
| Therefore we first see if we've already seen SIGNATURE in a DWP file, |
| then we check if we've already seen DWO_NAME, and only THEN do we check |
| for a DWO file. |
| |
| The result is a pointer to the dwo_unit object or NULL if we didn't find it |
| (dwo_id mismatch or couldn't find the DWO/DWP file). */ |
| |
| static struct dwo_unit * |
| lookup_dwo_cutu (struct dwarf2_per_cu_data *this_unit, |
| const char *dwo_name, const char *comp_dir, |
| ULONGEST signature, int is_debug_types) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| const char *kind = is_debug_types ? "TU" : "CU"; |
| void **dwo_file_slot; |
| struct dwo_file *dwo_file; |
| struct dwp_file *dwp_file; |
| |
| /* First see if there's a DWP file. |
| If we have a DWP file but didn't find the DWO inside it, don't |
| look for the original DWO file. It makes gdb behave differently |
| depending on whether one is debugging in the build tree. */ |
| |
| dwp_file = get_dwp_file (); |
| if (dwp_file != NULL) |
| { |
| const struct dwp_hash_table *dwp_htab = |
| is_debug_types ? dwp_file->tus : dwp_file->cus; |
| |
| if (dwp_htab != NULL) |
| { |
| struct dwo_unit *dwo_cutu = |
| lookup_dwo_unit_in_dwp (dwp_file, comp_dir, |
| signature, is_debug_types); |
| |
| if (dwo_cutu != NULL) |
| { |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Virtual DWO %s %s found: @%s\n", |
| kind, hex_string (signature), |
| host_address_to_string (dwo_cutu)); |
| } |
| return dwo_cutu; |
| } |
| } |
| } |
| else |
| { |
| /* No DWP file, look for the DWO file. */ |
| |
| dwo_file_slot = lookup_dwo_file_slot (dwo_name, comp_dir); |
| if (*dwo_file_slot == NULL) |
| { |
| /* Read in the file and build a table of the CUs/TUs it contains. */ |
| *dwo_file_slot = open_and_init_dwo_file (this_unit, dwo_name, comp_dir); |
| } |
| /* NOTE: This will be NULL if unable to open the file. */ |
| dwo_file = (struct dwo_file *) *dwo_file_slot; |
| |
| if (dwo_file != NULL) |
| { |
| struct dwo_unit *dwo_cutu = NULL; |
| |
| if (is_debug_types && dwo_file->tus) |
| { |
| struct dwo_unit find_dwo_cutu; |
| |
| memset (&find_dwo_cutu, 0, sizeof (find_dwo_cutu)); |
| find_dwo_cutu.signature = signature; |
| dwo_cutu |
| = (struct dwo_unit *) htab_find (dwo_file->tus, &find_dwo_cutu); |
| } |
| else if (!is_debug_types && dwo_file->cu) |
| { |
| if (signature == dwo_file->cu->signature) |
| dwo_cutu = dwo_file->cu; |
| } |
| |
| if (dwo_cutu != NULL) |
| { |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) found: @%s\n", |
| kind, dwo_name, hex_string (signature), |
| host_address_to_string (dwo_cutu)); |
| } |
| return dwo_cutu; |
| } |
| } |
| } |
| |
| /* We didn't find it. This could mean a dwo_id mismatch, or |
| someone deleted the DWO/DWP file, or the search path isn't set up |
| correctly to find the file. */ |
| |
| if (dwarf_read_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, "DWO %s %s(%s) not found\n", |
| kind, dwo_name, hex_string (signature)); |
| } |
| |
| /* This is a warning and not a complaint because it can be caused by |
| pilot error (e.g., user accidentally deleting the DWO). */ |
| { |
| /* Print the name of the DWP file if we looked there, helps the user |
| better diagnose the problem. */ |
| char *dwp_text = NULL; |
| struct cleanup *cleanups; |
| |
| if (dwp_file != NULL) |
| dwp_text = xstrprintf (" [in DWP file %s]", lbasename (dwp_file->name)); |
| cleanups = make_cleanup (xfree, dwp_text); |
| |
| warning (_("Could not find DWO %s %s(%s)%s referenced by %s at offset 0x%x" |
| " [in module %s]"), |
| kind, dwo_name, hex_string (signature), |
| dwp_text != NULL ? dwp_text : "", |
| this_unit->is_debug_types ? "TU" : "CU", |
| this_unit->offset.sect_off, objfile_name (objfile)); |
| |
| do_cleanups (cleanups); |
| } |
| return NULL; |
| } |
| |
| /* Lookup the DWO CU DWO_NAME/SIGNATURE referenced from THIS_CU. |
| See lookup_dwo_cutu_unit for details. */ |
| |
| static struct dwo_unit * |
| lookup_dwo_comp_unit (struct dwarf2_per_cu_data *this_cu, |
| const char *dwo_name, const char *comp_dir, |
| ULONGEST signature) |
| { |
| return lookup_dwo_cutu (this_cu, dwo_name, comp_dir, signature, 0); |
| } |
| |
| /* Lookup the DWO TU DWO_NAME/SIGNATURE referenced from THIS_TU. |
| See lookup_dwo_cutu_unit for details. */ |
| |
| static struct dwo_unit * |
| lookup_dwo_type_unit (struct signatured_type *this_tu, |
| const char *dwo_name, const char *comp_dir) |
| { |
| return lookup_dwo_cutu (&this_tu->per_cu, dwo_name, comp_dir, this_tu->signature, 1); |
| } |
| |
| /* Traversal function for queue_and_load_all_dwo_tus. */ |
| |
| static int |
| queue_and_load_dwo_tu (void **slot, void *info) |
| { |
| struct dwo_unit *dwo_unit = (struct dwo_unit *) *slot; |
| struct dwarf2_per_cu_data *per_cu = (struct dwarf2_per_cu_data *) info; |
| ULONGEST signature = dwo_unit->signature; |
| struct signatured_type *sig_type = |
| lookup_dwo_signatured_type (per_cu->cu, signature); |
| |
| if (sig_type != NULL) |
| { |
| struct dwarf2_per_cu_data *sig_cu = &sig_type->per_cu; |
| |
| /* We pass NULL for DEPENDENT_CU because we don't yet know if there's |
| a real dependency of PER_CU on SIG_TYPE. That is detected later |
| while processing PER_CU. */ |
| if (maybe_queue_comp_unit (NULL, sig_cu, per_cu->cu->language)) |
| load_full_type_unit (sig_cu); |
| VEC_safe_push (dwarf2_per_cu_ptr, per_cu->imported_symtabs, sig_cu); |
| } |
| |
| return 1; |
| } |
| |
| /* Queue all TUs contained in the DWO of PER_CU to be read in. |
| The DWO may have the only definition of the type, though it may not be |
| referenced anywhere in PER_CU. Thus we have to load *all* its TUs. |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15021 */ |
| |
| static void |
| queue_and_load_all_dwo_tus (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct dwo_unit *dwo_unit; |
| struct dwo_file *dwo_file; |
| |
| gdb_assert (!per_cu->is_debug_types); |
| gdb_assert (get_dwp_file () == NULL); |
| gdb_assert (per_cu->cu != NULL); |
| |
| dwo_unit = per_cu->cu->dwo_unit; |
| gdb_assert (dwo_unit != NULL); |
| |
| dwo_file = dwo_unit->dwo_file; |
| if (dwo_file->tus != NULL) |
| htab_traverse_noresize (dwo_file->tus, queue_and_load_dwo_tu, per_cu); |
| } |
| |
| /* Free all resources associated with DWO_FILE. |
| Close the DWO file and munmap the sections. |
| All memory should be on the objfile obstack. */ |
| |
| static void |
| free_dwo_file (struct dwo_file *dwo_file, struct objfile *objfile) |
| { |
| |
| /* Note: dbfd is NULL for virtual DWO files. */ |
| gdb_bfd_unref (dwo_file->dbfd); |
| |
| VEC_free (dwarf2_section_info_def, dwo_file->sections.types); |
| } |
| |
| /* Wrapper for free_dwo_file for use in cleanups. */ |
| |
| static void |
| free_dwo_file_cleanup (void *arg) |
| { |
| struct dwo_file *dwo_file = (struct dwo_file *) arg; |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| |
| free_dwo_file (dwo_file, objfile); |
| } |
| |
| /* Traversal function for free_dwo_files. */ |
| |
| static int |
| free_dwo_file_from_slot (void **slot, void *info) |
| { |
| struct dwo_file *dwo_file = (struct dwo_file *) *slot; |
| struct objfile *objfile = (struct objfile *) info; |
| |
| free_dwo_file (dwo_file, objfile); |
| |
| return 1; |
| } |
| |
| /* Free all resources associated with DWO_FILES. */ |
| |
| static void |
| free_dwo_files (htab_t dwo_files, struct objfile *objfile) |
| { |
| htab_traverse_noresize (dwo_files, free_dwo_file_from_slot, objfile); |
| } |
| |
| /* Read in various DIEs. */ |
| |
| /* qsort helper for inherit_abstract_dies. */ |
| |
| static int |
| unsigned_int_compar (const void *ap, const void *bp) |
| { |
| unsigned int a = *(unsigned int *) ap; |
| unsigned int b = *(unsigned int *) bp; |
| |
| return (a > b) - (b > a); |
| } |
| |
| /* DW_AT_abstract_origin inherits whole DIEs (not just their attributes). |
| Inherit only the children of the DW_AT_abstract_origin DIE not being |
| already referenced by DW_AT_abstract_origin from the children of the |
| current DIE. */ |
| |
| static void |
| inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct die_info *child_die; |
| unsigned die_children_count; |
| /* CU offsets which were referenced by children of the current DIE. */ |
| sect_offset *offsets; |
| sect_offset *offsets_end, *offsetp; |
| /* Parent of DIE - referenced by DW_AT_abstract_origin. */ |
| struct die_info *origin_die; |
| /* Iterator of the ORIGIN_DIE children. */ |
| struct die_info *origin_child_die; |
| struct cleanup *cleanups; |
| struct attribute *attr; |
| struct dwarf2_cu *origin_cu; |
| struct pending **origin_previous_list_in_scope; |
| |
| attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); |
| if (!attr) |
| return; |
| |
| /* Note that following die references may follow to a die in a |
| different cu. */ |
| |
| origin_cu = cu; |
| origin_die = follow_die_ref (die, attr, &origin_cu); |
| |
| /* We're inheriting ORIGIN's children into the scope we'd put DIE's |
| symbols in. */ |
| origin_previous_list_in_scope = origin_cu->list_in_scope; |
| origin_cu->list_in_scope = cu->list_in_scope; |
| |
| if (die->tag != origin_die->tag |
| && !(die->tag == DW_TAG_inlined_subroutine |
| && origin_die->tag == DW_TAG_subprogram)) |
| complaint (&symfile_complaints, |
| _("DIE 0x%x and its abstract origin 0x%x have different tags"), |
| die->offset.sect_off, origin_die->offset.sect_off); |
| |
| child_die = die->child; |
| die_children_count = 0; |
| while (child_die && child_die->tag) |
| { |
| child_die = sibling_die (child_die); |
| die_children_count++; |
| } |
| offsets = XNEWVEC (sect_offset, die_children_count); |
| cleanups = make_cleanup (xfree, offsets); |
| |
| offsets_end = offsets; |
| for (child_die = die->child; |
| child_die && child_die->tag; |
| child_die = sibling_die (child_die)) |
| { |
| struct die_info *child_origin_die; |
| struct dwarf2_cu *child_origin_cu; |
| |
| /* We are trying to process concrete instance entries: |
| DW_TAG_GNU_call_site DIEs indeed have a DW_AT_abstract_origin tag, but |
| it's not relevant to our analysis here. i.e. detecting DIEs that are |
| present in the abstract instance but not referenced in the concrete |
| one. */ |
| if (child_die->tag == DW_TAG_GNU_call_site) |
| continue; |
| |
| /* For each CHILD_DIE, find the corresponding child of |
| ORIGIN_DIE. If there is more than one layer of |
| DW_AT_abstract_origin, follow them all; there shouldn't be, |
| but GCC versions at least through 4.4 generate this (GCC PR |
| 40573). */ |
| child_origin_die = child_die; |
| child_origin_cu = cu; |
| while (1) |
| { |
| attr = dwarf2_attr (child_origin_die, DW_AT_abstract_origin, |
| child_origin_cu); |
| if (attr == NULL) |
| break; |
| child_origin_die = follow_die_ref (child_origin_die, attr, |
| &child_origin_cu); |
| } |
| |
| /* According to DWARF3 3.3.8.2 #3 new entries without their abstract |
| counterpart may exist. */ |
| if (child_origin_die != child_die) |
| { |
| if (child_die->tag != child_origin_die->tag |
| && !(child_die->tag == DW_TAG_inlined_subroutine |
| && child_origin_die->tag == DW_TAG_subprogram)) |
| complaint (&symfile_complaints, |
| _("Child DIE 0x%x and its abstract origin 0x%x have " |
| "different tags"), child_die->offset.sect_off, |
| child_origin_die->offset.sect_off); |
| if (child_origin_die->parent != origin_die) |
| complaint (&symfile_complaints, |
| _("Child DIE 0x%x and its abstract origin 0x%x have " |
| "different parents"), child_die->offset.sect_off, |
| child_origin_die->offset.sect_off); |
| else |
| *offsets_end++ = child_origin_die->offset; |
| } |
| } |
| qsort (offsets, offsets_end - offsets, sizeof (*offsets), |
| unsigned_int_compar); |
| for (offsetp = offsets + 1; offsetp < offsets_end; offsetp++) |
| if (offsetp[-1].sect_off == offsetp->sect_off) |
| complaint (&symfile_complaints, |
| _("Multiple children of DIE 0x%x refer " |
| "to DIE 0x%x as their abstract origin"), |
| die->offset.sect_off, offsetp->sect_off); |
| |
| offsetp = offsets; |
| origin_child_die = origin_die->child; |
| while (origin_child_die && origin_child_die->tag) |
| { |
| /* Is ORIGIN_CHILD_DIE referenced by any of the DIE children? */ |
| while (offsetp < offsets_end |
| && offsetp->sect_off < origin_child_die->offset.sect_off) |
| offsetp++; |
| if (offsetp >= offsets_end |
| || offsetp->sect_off > origin_child_die->offset.sect_off) |
| { |
| /* Found that ORIGIN_CHILD_DIE is really not referenced. |
| Check whether we're already processing ORIGIN_CHILD_DIE. |
| This can happen with mutually referenced abstract_origins. |
| PR 16581. */ |
| if (!origin_child_die->in_process) |
| process_die (origin_child_die, origin_cu); |
| } |
| origin_child_die = sibling_die (origin_child_die); |
| } |
| origin_cu->list_in_scope = origin_previous_list_in_scope; |
| |
| do_cleanups (cleanups); |
| } |
| |
| static void |
| read_func_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct context_stack *newobj; |
| CORE_ADDR lowpc; |
| CORE_ADDR highpc; |
| struct die_info *child_die; |
| struct attribute *attr, *call_line, *call_file; |
| const char *name; |
| CORE_ADDR baseaddr; |
| struct block *block; |
| int inlined_func = (die->tag == DW_TAG_inlined_subroutine); |
| VEC (symbolp) *template_args = NULL; |
| struct template_symbol *templ_func = NULL; |
| |
| if (inlined_func) |
| { |
| /* If we do not have call site information, we can't show the |
| caller of this inlined function. That's too confusing, so |
| only use the scope for local variables. */ |
| call_line = dwarf2_attr (die, DW_AT_call_line, cu); |
| call_file = dwarf2_attr (die, DW_AT_call_file, cu); |
| if (call_line == NULL || call_file == NULL) |
| { |
| read_lexical_block_scope (die, cu); |
| return; |
| } |
| } |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| name = dwarf2_name (die, cu); |
| |
| /* Ignore functions with missing or empty names. These are actually |
| illegal according to the DWARF standard. */ |
| if (name == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("missing name for subprogram DIE at %d"), |
| die->offset.sect_off); |
| return; |
| } |
| |
| /* Ignore functions with missing or invalid low and high pc attributes. */ |
| if (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL) |
| <= PC_BOUNDS_INVALID) |
| { |
| attr = dwarf2_attr (die, DW_AT_external, cu); |
| if (!attr || !DW_UNSND (attr)) |
| complaint (&symfile_complaints, |
| _("cannot get low and high bounds " |
| "for subprogram DIE at %d"), |
| die->offset.sect_off); |
| return; |
| } |
| |
| lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); |
| highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); |
| |
| /* If we have any template arguments, then we must allocate a |
| different sort of symbol. */ |
| for (child_die = die->child; child_die; child_die = sibling_die (child_die)) |
| { |
| if (child_die->tag == DW_TAG_template_type_param |
| || child_die->tag == DW_TAG_template_value_param) |
| { |
| templ_func = allocate_template_symbol (objfile); |
| templ_func->base.is_cplus_template_function = 1; |
| break; |
| } |
| } |
| |
| newobj = push_context (0, lowpc); |
| newobj->name = new_symbol_full (die, read_type_die (die, cu), cu, |
| (struct symbol *) templ_func); |
| |
| /* If there is a location expression for DW_AT_frame_base, record |
| it. */ |
| attr = dwarf2_attr (die, DW_AT_frame_base, cu); |
| if (attr) |
| dwarf2_symbol_mark_computed (attr, newobj->name, cu, 1); |
| |
| /* If there is a location for the static link, record it. */ |
| newobj->static_link = NULL; |
| attr = dwarf2_attr (die, DW_AT_static_link, cu); |
| if (attr) |
| { |
| newobj->static_link |
| = XOBNEW (&objfile->objfile_obstack, struct dynamic_prop); |
| attr_to_dynamic_prop (attr, die, cu, newobj->static_link); |
| } |
| |
| cu->list_in_scope = &local_symbols; |
| |
| if (die->child != NULL) |
| { |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_template_type_param |
| || child_die->tag == DW_TAG_template_value_param) |
| { |
| struct symbol *arg = new_symbol (child_die, NULL, cu); |
| |
| if (arg != NULL) |
| VEC_safe_push (symbolp, template_args, arg); |
| } |
| else |
| process_die (child_die, cu); |
| child_die = sibling_die (child_die); |
| } |
| } |
| |
| inherit_abstract_dies (die, cu); |
| |
| /* If we have a DW_AT_specification, we might need to import using |
| directives from the context of the specification DIE. See the |
| comment in determine_prefix. */ |
| if (cu->language == language_cplus |
| && dwarf2_attr (die, DW_AT_specification, cu)) |
| { |
| struct dwarf2_cu *spec_cu = cu; |
| struct die_info *spec_die = die_specification (die, &spec_cu); |
| |
| while (spec_die) |
| { |
| child_die = spec_die->child; |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_imported_module) |
| process_die (child_die, spec_cu); |
| child_die = sibling_die (child_die); |
| } |
| |
| /* In some cases, GCC generates specification DIEs that |
| themselves contain DW_AT_specification attributes. */ |
| spec_die = die_specification (spec_die, &spec_cu); |
| } |
| } |
| |
| newobj = pop_context (); |
| /* Make a block for the local symbols within. */ |
| block = finish_block (newobj->name, &local_symbols, newobj->old_blocks, |
| newobj->static_link, lowpc, highpc); |
| |
| /* For C++, set the block's scope. */ |
| if ((cu->language == language_cplus |
| || cu->language == language_fortran |
| || cu->language == language_d |
| || cu->language == language_rust) |
| && cu->processing_has_namespace_info) |
| block_set_scope (block, determine_prefix (die, cu), |
| &objfile->objfile_obstack); |
| |
| /* If we have address ranges, record them. */ |
| dwarf2_record_block_ranges (die, block, baseaddr, cu); |
| |
| gdbarch_make_symbol_special (gdbarch, newobj->name, objfile); |
| |
| /* Attach template arguments to function. */ |
| if (! VEC_empty (symbolp, template_args)) |
| { |
| gdb_assert (templ_func != NULL); |
| |
| templ_func->n_template_arguments = VEC_length (symbolp, template_args); |
| templ_func->template_arguments |
| = XOBNEWVEC (&objfile->objfile_obstack, struct symbol *, |
| templ_func->n_template_arguments); |
| memcpy (templ_func->template_arguments, |
| VEC_address (symbolp, template_args), |
| (templ_func->n_template_arguments * sizeof (struct symbol *))); |
| VEC_free (symbolp, template_args); |
| } |
| |
| /* In C++, we can have functions nested inside functions (e.g., when |
| a function declares a class that has methods). This means that |
| when we finish processing a function scope, we may need to go |
| back to building a containing block's symbol lists. */ |
| local_symbols = newobj->locals; |
| local_using_directives = newobj->local_using_directives; |
| |
| /* If we've finished processing a top-level function, subsequent |
| symbols go in the file symbol list. */ |
| if (outermost_context_p ()) |
| cu->list_in_scope = &file_symbols; |
| } |
| |
| /* Process all the DIES contained within a lexical block scope. Start |
| a new scope, process the dies, and then close the scope. */ |
| |
| static void |
| read_lexical_block_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct context_stack *newobj; |
| CORE_ADDR lowpc, highpc; |
| struct die_info *child_die; |
| CORE_ADDR baseaddr; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| /* Ignore blocks with missing or invalid low and high pc attributes. */ |
| /* ??? Perhaps consider discontiguous blocks defined by DW_AT_ranges |
| as multiple lexical blocks? Handling children in a sane way would |
| be nasty. Might be easier to properly extend generic blocks to |
| describe ranges. */ |
| switch (dwarf2_get_pc_bounds (die, &lowpc, &highpc, cu, NULL)) |
| { |
| case PC_BOUNDS_NOT_PRESENT: |
| /* DW_TAG_lexical_block has no attributes, process its children as if |
| there was no wrapping by that DW_TAG_lexical_block. |
| GCC does no longer produces such DWARF since GCC r224161. */ |
| for (child_die = die->child; |
| child_die != NULL && child_die->tag; |
| child_die = sibling_die (child_die)) |
| process_die (child_die, cu); |
| return; |
| case PC_BOUNDS_INVALID: |
| return; |
| } |
| lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); |
| highpc = gdbarch_adjust_dwarf2_addr (gdbarch, highpc + baseaddr); |
| |
| push_context (0, lowpc); |
| if (die->child != NULL) |
| { |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| process_die (child_die, cu); |
| child_die = sibling_die (child_die); |
| } |
| } |
| inherit_abstract_dies (die, cu); |
| newobj = pop_context (); |
| |
| if (local_symbols != NULL || local_using_directives != NULL) |
| { |
| struct block *block |
| = finish_block (0, &local_symbols, newobj->old_blocks, NULL, |
| newobj->start_addr, highpc); |
| |
| /* Note that recording ranges after traversing children, as we |
| do here, means that recording a parent's ranges entails |
| walking across all its children's ranges as they appear in |
| the address map, which is quadratic behavior. |
| |
| It would be nicer to record the parent's ranges before |
| traversing its children, simply overriding whatever you find |
| there. But since we don't even decide whether to create a |
| block until after we've traversed its children, that's hard |
| to do. */ |
| dwarf2_record_block_ranges (die, block, baseaddr, cu); |
| } |
| local_symbols = newobj->locals; |
| local_using_directives = newobj->local_using_directives; |
| } |
| |
| /* Read in DW_TAG_GNU_call_site and insert it to CU->call_site_htab. */ |
| |
| static void |
| read_call_site_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| CORE_ADDR pc, baseaddr; |
| struct attribute *attr; |
| struct call_site *call_site, call_site_local; |
| void **slot; |
| int nparams; |
| struct die_info *child_die; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| attr = dwarf2_attr (die, DW_AT_low_pc, cu); |
| if (!attr) |
| { |
| complaint (&symfile_complaints, |
| _("missing DW_AT_low_pc for DW_TAG_GNU_call_site " |
| "DIE 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (objfile)); |
| return; |
| } |
| pc = attr_value_as_address (attr) + baseaddr; |
| pc = gdbarch_adjust_dwarf2_addr (gdbarch, pc); |
| |
| if (cu->call_site_htab == NULL) |
| cu->call_site_htab = htab_create_alloc_ex (16, core_addr_hash, core_addr_eq, |
| NULL, &objfile->objfile_obstack, |
| hashtab_obstack_allocate, NULL); |
| call_site_local.pc = pc; |
| slot = htab_find_slot (cu->call_site_htab, &call_site_local, INSERT); |
| if (*slot != NULL) |
| { |
| complaint (&symfile_complaints, |
| _("Duplicate PC %s for DW_TAG_GNU_call_site " |
| "DIE 0x%x [in module %s]"), |
| paddress (gdbarch, pc), die->offset.sect_off, |
| objfile_name (objfile)); |
| return; |
| } |
| |
| /* Count parameters at the caller. */ |
| |
| nparams = 0; |
| for (child_die = die->child; child_die && child_die->tag; |
| child_die = sibling_die (child_die)) |
| { |
| if (child_die->tag != DW_TAG_GNU_call_site_parameter) |
| { |
| complaint (&symfile_complaints, |
| _("Tag %d is not DW_TAG_GNU_call_site_parameter in " |
| "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), |
| child_die->tag, child_die->offset.sect_off, |
| objfile_name (objfile)); |
| continue; |
| } |
| |
| nparams++; |
| } |
| |
| call_site |
| = ((struct call_site *) |
| obstack_alloc (&objfile->objfile_obstack, |
| sizeof (*call_site) |
| + (sizeof (*call_site->parameter) * (nparams - 1)))); |
| *slot = call_site; |
| memset (call_site, 0, sizeof (*call_site) - sizeof (*call_site->parameter)); |
| call_site->pc = pc; |
| |
| if (dwarf2_flag_true_p (die, DW_AT_GNU_tail_call, cu)) |
| { |
| struct die_info *func_die; |
| |
| /* Skip also over DW_TAG_inlined_subroutine. */ |
| for (func_die = die->parent; |
| func_die && func_die->tag != DW_TAG_subprogram |
| && func_die->tag != DW_TAG_subroutine_type; |
| func_die = func_die->parent); |
| |
| /* DW_AT_GNU_all_call_sites is a superset |
| of DW_AT_GNU_all_tail_call_sites. */ |
| if (func_die |
| && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_call_sites, cu) |
| && !dwarf2_flag_true_p (func_die, DW_AT_GNU_all_tail_call_sites, cu)) |
| { |
| /* TYPE_TAIL_CALL_LIST is not interesting in functions where it is |
| not complete. But keep CALL_SITE for look ups via call_site_htab, |
| both the initial caller containing the real return address PC and |
| the final callee containing the current PC of a chain of tail |
| calls do not need to have the tail call list complete. But any |
| function candidate for a virtual tail call frame searched via |
| TYPE_TAIL_CALL_LIST must have the tail call list complete to be |
| determined unambiguously. */ |
| } |
| else |
| { |
| struct type *func_type = NULL; |
| |
| if (func_die) |
| func_type = get_die_type (func_die, cu); |
| if (func_type != NULL) |
| { |
| gdb_assert (TYPE_CODE (func_type) == TYPE_CODE_FUNC); |
| |
| /* Enlist this call site to the function. */ |
| call_site->tail_call_next = TYPE_TAIL_CALL_LIST (func_type); |
| TYPE_TAIL_CALL_LIST (func_type) = call_site; |
| } |
| else |
| complaint (&symfile_complaints, |
| _("Cannot find function owning DW_TAG_GNU_call_site " |
| "DIE 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (objfile)); |
| } |
| } |
| |
| attr = dwarf2_attr (die, DW_AT_GNU_call_site_target, cu); |
| if (attr == NULL) |
| attr = dwarf2_attr (die, DW_AT_abstract_origin, cu); |
| SET_FIELD_DWARF_BLOCK (call_site->target, NULL); |
| if (!attr || (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0)) |
| /* Keep NULL DWARF_BLOCK. */; |
| else if (attr_form_is_block (attr)) |
| { |
| struct dwarf2_locexpr_baton *dlbaton; |
| |
| dlbaton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); |
| dlbaton->data = DW_BLOCK (attr)->data; |
| dlbaton->size = DW_BLOCK (attr)->size; |
| dlbaton->per_cu = cu->per_cu; |
| |
| SET_FIELD_DWARF_BLOCK (call_site->target, dlbaton); |
| } |
| else if (attr_form_is_ref (attr)) |
| { |
| struct dwarf2_cu *target_cu = cu; |
| struct die_info *target_die; |
| |
| target_die = follow_die_ref (die, attr, &target_cu); |
| gdb_assert (target_cu->objfile == objfile); |
| if (die_is_declaration (target_die, target_cu)) |
| { |
| const char *target_physname; |
| |
| /* Prefer the mangled name; otherwise compute the demangled one. */ |
| target_physname = dwarf2_string_attr (target_die, |
| DW_AT_linkage_name, |
| target_cu); |
| if (target_physname == NULL) |
| target_physname = dwarf2_string_attr (target_die, |
| DW_AT_MIPS_linkage_name, |
| target_cu); |
| if (target_physname == NULL) |
| target_physname = dwarf2_physname (NULL, target_die, target_cu); |
| if (target_physname == NULL) |
| complaint (&symfile_complaints, |
| _("DW_AT_GNU_call_site_target target DIE has invalid " |
| "physname, for referencing DIE 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (objfile)); |
| else |
| SET_FIELD_PHYSNAME (call_site->target, target_physname); |
| } |
| else |
| { |
| CORE_ADDR lowpc; |
| |
| /* DW_AT_entry_pc should be preferred. */ |
| if (dwarf2_get_pc_bounds (target_die, &lowpc, NULL, target_cu, NULL) |
| <= PC_BOUNDS_INVALID) |
| complaint (&symfile_complaints, |
| _("DW_AT_GNU_call_site_target target DIE has invalid " |
| "low pc, for referencing DIE 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (objfile)); |
| else |
| { |
| lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, lowpc + baseaddr); |
| SET_FIELD_PHYSADDR (call_site->target, lowpc); |
| } |
| } |
| } |
| else |
| complaint (&symfile_complaints, |
| _("DW_TAG_GNU_call_site DW_AT_GNU_call_site_target is neither " |
| "block nor reference, for DIE 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (objfile)); |
| |
| call_site->per_cu = cu->per_cu; |
| |
| for (child_die = die->child; |
| child_die && child_die->tag; |
| child_die = sibling_die (child_die)) |
| { |
| struct call_site_parameter *parameter; |
| struct attribute *loc, *origin; |
| |
| if (child_die->tag != DW_TAG_GNU_call_site_parameter) |
| { |
| /* Already printed the complaint above. */ |
| continue; |
| } |
| |
| gdb_assert (call_site->parameter_count < nparams); |
| parameter = &call_site->parameter[call_site->parameter_count]; |
| |
| /* DW_AT_location specifies the register number or DW_AT_abstract_origin |
| specifies DW_TAG_formal_parameter. Value of the data assumed for the |
| register is contained in DW_AT_GNU_call_site_value. */ |
| |
| loc = dwarf2_attr (child_die, DW_AT_location, cu); |
| origin = dwarf2_attr (child_die, DW_AT_abstract_origin, cu); |
| if (loc == NULL && origin != NULL && attr_form_is_ref (origin)) |
| { |
| sect_offset offset; |
| |
| parameter->kind = CALL_SITE_PARAMETER_PARAM_OFFSET; |
| offset = dwarf2_get_ref_die_offset (origin); |
| if (!offset_in_cu_p (&cu->header, offset)) |
| { |
| /* As DW_OP_GNU_parameter_ref uses CU-relative offset this |
| binding can be done only inside one CU. Such referenced DIE |
| therefore cannot be even moved to DW_TAG_partial_unit. */ |
| complaint (&symfile_complaints, |
| _("DW_AT_abstract_origin offset is not in CU for " |
| "DW_TAG_GNU_call_site child DIE 0x%x " |
| "[in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| continue; |
| } |
| parameter->u.param_offset.cu_off = (offset.sect_off |
| - cu->header.offset.sect_off); |
| } |
| else if (loc == NULL || origin != NULL || !attr_form_is_block (loc)) |
| { |
| complaint (&symfile_complaints, |
| _("No DW_FORM_block* DW_AT_location for " |
| "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| continue; |
| } |
| else |
| { |
| parameter->u.dwarf_reg = dwarf_block_to_dwarf_reg |
| (DW_BLOCK (loc)->data, &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size]); |
| if (parameter->u.dwarf_reg != -1) |
| parameter->kind = CALL_SITE_PARAMETER_DWARF_REG; |
| else if (dwarf_block_to_sp_offset (gdbarch, DW_BLOCK (loc)->data, |
| &DW_BLOCK (loc)->data[DW_BLOCK (loc)->size], |
| ¶meter->u.fb_offset)) |
| parameter->kind = CALL_SITE_PARAMETER_FB_OFFSET; |
| else |
| { |
| complaint (&symfile_complaints, |
| _("Only single DW_OP_reg or DW_OP_fbreg is supported " |
| "for DW_FORM_block* DW_AT_location is supported for " |
| "DW_TAG_GNU_call_site child DIE 0x%x " |
| "[in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| continue; |
| } |
| } |
| |
| attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_value, cu); |
| if (!attr_form_is_block (attr)) |
| { |
| complaint (&symfile_complaints, |
| _("No DW_FORM_block* DW_AT_GNU_call_site_value for " |
| "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| continue; |
| } |
| parameter->value = DW_BLOCK (attr)->data; |
| parameter->value_size = DW_BLOCK (attr)->size; |
| |
| /* Parameters are not pre-cleared by memset above. */ |
| parameter->data_value = NULL; |
| parameter->data_value_size = 0; |
| call_site->parameter_count++; |
| |
| attr = dwarf2_attr (child_die, DW_AT_GNU_call_site_data_value, cu); |
| if (attr) |
| { |
| if (!attr_form_is_block (attr)) |
| complaint (&symfile_complaints, |
| _("No DW_FORM_block* DW_AT_GNU_call_site_data_value for " |
| "DW_TAG_GNU_call_site child DIE 0x%x [in module %s]"), |
| child_die->offset.sect_off, objfile_name (objfile)); |
| else |
| { |
| parameter->data_value = DW_BLOCK (attr)->data; |
| parameter->data_value_size = DW_BLOCK (attr)->size; |
| } |
| } |
| } |
| } |
| |
| /* Get low and high pc attributes from DW_AT_ranges attribute value OFFSET. |
| Return 1 if the attributes are present and valid, otherwise, return 0. |
| If RANGES_PST is not NULL we should setup `objfile->psymtabs_addrmap'. */ |
| |
| static int |
| dwarf2_ranges_read (unsigned offset, CORE_ADDR *low_return, |
| CORE_ADDR *high_return, struct dwarf2_cu *cu, |
| struct partial_symtab *ranges_pst) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct comp_unit_head *cu_header = &cu->header; |
| bfd *obfd = objfile->obfd; |
| unsigned int addr_size = cu_header->addr_size; |
| CORE_ADDR mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); |
| /* Base address selection entry. */ |
| CORE_ADDR base; |
| int found_base; |
| unsigned int dummy; |
| const gdb_byte *buffer; |
| int low_set; |
| CORE_ADDR low = 0; |
| CORE_ADDR high = 0; |
| CORE_ADDR baseaddr; |
| |
| found_base = cu->base_known; |
| base = cu->base_address; |
| |
| dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges); |
| if (offset >= dwarf2_per_objfile->ranges.size) |
| { |
| complaint (&symfile_complaints, |
| _("Offset %d out of bounds for DW_AT_ranges attribute"), |
| offset); |
| return 0; |
| } |
| buffer = dwarf2_per_objfile->ranges.buffer + offset; |
| |
| low_set = 0; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| while (1) |
| { |
| CORE_ADDR range_beginning, range_end; |
| |
| range_beginning = read_address (obfd, buffer, cu, &dummy); |
| buffer += addr_size; |
| range_end = read_address (obfd, buffer, cu, &dummy); |
| buffer += addr_size; |
| offset += 2 * addr_size; |
| |
| /* An end of list marker is a pair of zero addresses. */ |
| if (range_beginning == 0 && range_end == 0) |
| /* Found the end of list entry. */ |
| break; |
| |
| /* Each base address selection entry is a pair of 2 values. |
| The first is the largest possible address, the second is |
| the base address. Check for a base address here. */ |
| if ((range_beginning & mask) == mask) |
| { |
| /* If we found the largest possible address, then we already |
| have the base address in range_end. */ |
| base = range_end; |
| found_base = 1; |
| continue; |
| } |
| |
| if (!found_base) |
| { |
| /* We have no valid base address for the ranges |
| data. */ |
| complaint (&symfile_complaints, |
| _("Invalid .debug_ranges data (no base address)")); |
| return 0; |
| } |
| |
| if (range_beginning > range_end) |
| { |
| /* Inverted range entries are invalid. */ |
| complaint (&symfile_complaints, |
| _("Invalid .debug_ranges data (inverted range)")); |
| return 0; |
| } |
| |
| /* Empty range entries have no effect. */ |
| if (range_beginning == range_end) |
| continue; |
| |
| range_beginning += base; |
| range_end += base; |
| |
| /* A not-uncommon case of bad debug info. |
| Don't pollute the addrmap with bad data. */ |
| if (range_beginning + baseaddr == 0 |
| && !dwarf2_per_objfile->has_section_at_zero) |
| { |
| complaint (&symfile_complaints, |
| _(".debug_ranges entry has start address of zero" |
| " [in module %s]"), objfile_name (objfile)); |
| continue; |
| } |
| |
| if (ranges_pst != NULL) |
| { |
| CORE_ADDR lowpc; |
| CORE_ADDR highpc; |
| |
| lowpc = gdbarch_adjust_dwarf2_addr (gdbarch, |
| range_beginning + baseaddr); |
| highpc = gdbarch_adjust_dwarf2_addr (gdbarch, |
| range_end + baseaddr); |
| addrmap_set_empty (objfile->psymtabs_addrmap, lowpc, highpc - 1, |
| ranges_pst); |
| } |
| |
| /* FIXME: This is recording everything as a low-high |
| segment of consecutive addresses. We should have a |
| data structure for discontiguous block ranges |
| instead. */ |
| if (! low_set) |
| { |
| low = range_beginning; |
| high = range_end; |
| low_set = 1; |
| } |
| else |
| { |
| if (range_beginning < low) |
| low = range_beginning; |
| if (range_end > high) |
| high = range_end; |
| } |
| } |
| |
| if (! low_set) |
| /* If the first entry is an end-of-list marker, the range |
| describes an empty scope, i.e. no instructions. */ |
| return 0; |
| |
| if (low_return) |
| *low_return = low; |
| if (high_return) |
| *high_return = high; |
| return 1; |
| } |
| |
| /* Get low and high pc attributes from a die. See enum pc_bounds_kind |
| definition for the return value. *LOWPC and *HIGHPC are set iff |
| neither PC_BOUNDS_NOT_PRESENT nor PC_BOUNDS_INVALID are returned. */ |
| |
| static enum pc_bounds_kind |
| dwarf2_get_pc_bounds (struct die_info *die, CORE_ADDR *lowpc, |
| CORE_ADDR *highpc, struct dwarf2_cu *cu, |
| struct partial_symtab *pst) |
| { |
| struct attribute *attr; |
| struct attribute *attr_high; |
| CORE_ADDR low = 0; |
| CORE_ADDR high = 0; |
| enum pc_bounds_kind ret; |
| |
| attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); |
| if (attr_high) |
| { |
| attr = dwarf2_attr (die, DW_AT_low_pc, cu); |
| if (attr) |
| { |
| low = attr_value_as_address (attr); |
| high = attr_value_as_address (attr_high); |
| if (cu->header.version >= 4 && attr_form_is_constant (attr_high)) |
| high += low; |
| } |
| else |
| /* Found high w/o low attribute. */ |
| return PC_BOUNDS_INVALID; |
| |
| /* Found consecutive range of addresses. */ |
| ret = PC_BOUNDS_HIGH_LOW; |
| } |
| else |
| { |
| attr = dwarf2_attr (die, DW_AT_ranges, cu); |
| if (attr != NULL) |
| { |
| /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton. |
| We take advantage of the fact that DW_AT_ranges does not appear |
| in DW_TAG_compile_unit of DWO files. */ |
| int need_ranges_base = die->tag != DW_TAG_compile_unit; |
| unsigned int ranges_offset = (DW_UNSND (attr) |
| + (need_ranges_base |
| ? cu->ranges_base |
| : 0)); |
| |
| /* Value of the DW_AT_ranges attribute is the offset in the |
| .debug_ranges section. */ |
| if (!dwarf2_ranges_read (ranges_offset, &low, &high, cu, pst)) |
| return PC_BOUNDS_INVALID; |
| /* Found discontinuous range of addresses. */ |
| ret = PC_BOUNDS_RANGES; |
| } |
| else |
| return PC_BOUNDS_NOT_PRESENT; |
| } |
| |
| /* read_partial_die has also the strict LOW < HIGH requirement. */ |
| if (high <= low) |
| return PC_BOUNDS_INVALID; |
| |
| /* When using the GNU linker, .gnu.linkonce. sections are used to |
| eliminate duplicate copies of functions and vtables and such. |
| The linker will arbitrarily choose one and discard the others. |
| The AT_*_pc values for such functions refer to local labels in |
| these sections. If the section from that file was discarded, the |
| labels are not in the output, so the relocs get a value of 0. |
| If this is a discarded function, mark the pc bounds as invalid, |
| so that GDB will ignore it. */ |
| if (low == 0 && !dwarf2_per_objfile->has_section_at_zero) |
| return PC_BOUNDS_INVALID; |
| |
| *lowpc = low; |
| if (highpc) |
| *highpc = high; |
| return ret; |
| } |
| |
| /* Assuming that DIE represents a subprogram DIE or a lexical block, get |
| its low and high PC addresses. Do nothing if these addresses could not |
| be determined. Otherwise, set LOWPC to the low address if it is smaller, |
| and HIGHPC to the high address if greater than HIGHPC. */ |
| |
| static void |
| dwarf2_get_subprogram_pc_bounds (struct die_info *die, |
| CORE_ADDR *lowpc, CORE_ADDR *highpc, |
| struct dwarf2_cu *cu) |
| { |
| CORE_ADDR low, high; |
| struct die_info *child = die->child; |
| |
| if (dwarf2_get_pc_bounds (die, &low, &high, cu, NULL) >= PC_BOUNDS_RANGES) |
| { |
| *lowpc = std::min (*lowpc, low); |
| *highpc = std::max (*highpc, high); |
| } |
| |
| /* If the language does not allow nested subprograms (either inside |
| subprograms or lexical blocks), we're done. */ |
| if (cu->language != language_ada) |
| return; |
| |
| /* Check all the children of the given DIE. If it contains nested |
| subprograms, then check their pc bounds. Likewise, we need to |
| check lexical blocks as well, as they may also contain subprogram |
| definitions. */ |
| while (child && child->tag) |
| { |
| if (child->tag == DW_TAG_subprogram |
| || child->tag == DW_TAG_lexical_block) |
| dwarf2_get_subprogram_pc_bounds (child, lowpc, highpc, cu); |
| child = sibling_die (child); |
| } |
| } |
| |
| /* Get the low and high pc's represented by the scope DIE, and store |
| them in *LOWPC and *HIGHPC. If the correct values can't be |
| determined, set *LOWPC to -1 and *HIGHPC to 0. */ |
| |
| static void |
| get_scope_pc_bounds (struct die_info *die, |
| CORE_ADDR *lowpc, CORE_ADDR *highpc, |
| struct dwarf2_cu *cu) |
| { |
| CORE_ADDR best_low = (CORE_ADDR) -1; |
| CORE_ADDR best_high = (CORE_ADDR) 0; |
| CORE_ADDR current_low, current_high; |
| |
| if (dwarf2_get_pc_bounds (die, ¤t_low, ¤t_high, cu, NULL) |
| >= PC_BOUNDS_RANGES) |
| { |
| best_low = current_low; |
| best_high = current_high; |
| } |
| else |
| { |
| struct die_info *child = die->child; |
| |
| while (child && child->tag) |
| { |
| switch (child->tag) { |
| case DW_TAG_subprogram: |
| dwarf2_get_subprogram_pc_bounds (child, &best_low, &best_high, cu); |
| break; |
| case DW_TAG_namespace: |
| case DW_TAG_module: |
| /* FIXME: carlton/2004-01-16: Should we do this for |
| DW_TAG_class_type/DW_TAG_structure_type, too? I think |
| that current GCC's always emit the DIEs corresponding |
| to definitions of methods of classes as children of a |
| DW_TAG_compile_unit or DW_TAG_namespace (as opposed to |
| the DIEs giving the declarations, which could be |
| anywhere). But I don't see any reason why the |
| standards says that they have to be there. */ |
| get_scope_pc_bounds (child, ¤t_low, ¤t_high, cu); |
| |
| if (current_low != ((CORE_ADDR) -1)) |
| { |
| best_low = std::min (best_low, current_low); |
| best_high = std::max (best_high, current_high); |
| } |
| break; |
| default: |
| /* Ignore. */ |
| break; |
| } |
| |
| child = sibling_die (child); |
| } |
| } |
| |
| *lowpc = best_low; |
| *highpc = best_high; |
| } |
| |
| /* Record the address ranges for BLOCK, offset by BASEADDR, as given |
| in DIE. */ |
| |
| static void |
| dwarf2_record_block_ranges (struct die_info *die, struct block *block, |
| CORE_ADDR baseaddr, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct attribute *attr; |
| struct attribute *attr_high; |
| |
| attr_high = dwarf2_attr (die, DW_AT_high_pc, cu); |
| if (attr_high) |
| { |
| attr = dwarf2_attr (die, DW_AT_low_pc, cu); |
| if (attr) |
| { |
| CORE_ADDR low = attr_value_as_address (attr); |
| CORE_ADDR high = attr_value_as_address (attr_high); |
| |
| if (cu->header.version >= 4 && attr_form_is_constant (attr_high)) |
| high += low; |
| |
| low = gdbarch_adjust_dwarf2_addr (gdbarch, low + baseaddr); |
| high = gdbarch_adjust_dwarf2_addr (gdbarch, high + baseaddr); |
| record_block_range (block, low, high - 1); |
| } |
| } |
| |
| attr = dwarf2_attr (die, DW_AT_ranges, cu); |
| if (attr) |
| { |
| bfd *obfd = objfile->obfd; |
| /* DW_AT_ranges_base does not apply to DIEs from the DWO skeleton. |
| We take advantage of the fact that DW_AT_ranges does not appear |
| in DW_TAG_compile_unit of DWO files. */ |
| int need_ranges_base = die->tag != DW_TAG_compile_unit; |
| |
| /* The value of the DW_AT_ranges attribute is the offset of the |
| address range list in the .debug_ranges section. */ |
| unsigned long offset = (DW_UNSND (attr) |
| + (need_ranges_base ? cu->ranges_base : 0)); |
| const gdb_byte *buffer; |
| |
| /* For some target architectures, but not others, the |
| read_address function sign-extends the addresses it returns. |
| To recognize base address selection entries, we need a |
| mask. */ |
| unsigned int addr_size = cu->header.addr_size; |
| CORE_ADDR base_select_mask = ~(~(CORE_ADDR)1 << (addr_size * 8 - 1)); |
| |
| /* The base address, to which the next pair is relative. Note |
| that this 'base' is a DWARF concept: most entries in a range |
| list are relative, to reduce the number of relocs against the |
| debugging information. This is separate from this function's |
| 'baseaddr' argument, which GDB uses to relocate debugging |
| information from a shared library based on the address at |
| which the library was loaded. */ |
| CORE_ADDR base = cu->base_address; |
| int base_known = cu->base_known; |
| |
| dwarf2_read_section (objfile, &dwarf2_per_objfile->ranges); |
| if (offset >= dwarf2_per_objfile->ranges.size) |
| { |
| complaint (&symfile_complaints, |
| _("Offset %lu out of bounds for DW_AT_ranges attribute"), |
| offset); |
| return; |
| } |
| buffer = dwarf2_per_objfile->ranges.buffer + offset; |
| |
| for (;;) |
| { |
| unsigned int bytes_read; |
| CORE_ADDR start, end; |
| |
| start = read_address (obfd, buffer, cu, &bytes_read); |
| buffer += bytes_read; |
| end = read_address (obfd, buffer, cu, &bytes_read); |
| buffer += bytes_read; |
| |
| /* Did we find the end of the range list? */ |
| if (start == 0 && end == 0) |
| break; |
| |
| /* Did we find a base address selection entry? */ |
| else if ((start & base_select_mask) == base_select_mask) |
| { |
| base = end; |
| base_known = 1; |
| } |
| |
| /* We found an ordinary address range. */ |
| else |
| { |
| if (!base_known) |
| { |
| complaint (&symfile_complaints, |
| _("Invalid .debug_ranges data " |
| "(no base address)")); |
| return; |
| } |
| |
| if (start > end) |
| { |
| /* Inverted range entries are invalid. */ |
| complaint (&symfile_complaints, |
| _("Invalid .debug_ranges data " |
| "(inverted range)")); |
| return; |
| } |
| |
| /* Empty range entries have no effect. */ |
| if (start == end) |
| continue; |
| |
| start += base + baseaddr; |
| end += base + baseaddr; |
| |
| /* A not-uncommon case of bad debug info. |
| Don't pollute the addrmap with bad data. */ |
| if (start == 0 && !dwarf2_per_objfile->has_section_at_zero) |
| { |
| complaint (&symfile_complaints, |
| _(".debug_ranges entry has start address of zero" |
| " [in module %s]"), objfile_name (objfile)); |
| continue; |
| } |
| |
| start = gdbarch_adjust_dwarf2_addr (gdbarch, start); |
| end = gdbarch_adjust_dwarf2_addr (gdbarch, end); |
| record_block_range (block, start, end - 1); |
| } |
| } |
| } |
| } |
| |
| /* Check whether the producer field indicates either of GCC < 4.6, or the |
| Intel C/C++ compiler, and cache the result in CU. */ |
| |
| static void |
| check_producer (struct dwarf2_cu *cu) |
| { |
| int major, minor; |
| |
| if (cu->producer == NULL) |
| { |
| /* For unknown compilers expect their behavior is DWARF version |
| compliant. |
| |
| GCC started to support .debug_types sections by -gdwarf-4 since |
| gcc-4.5.x. As the .debug_types sections are missing DW_AT_producer |
| for their space efficiency GDB cannot workaround gcc-4.5.x -gdwarf-4 |
| combination. gcc-4.5.x -gdwarf-4 binaries have DW_AT_accessibility |
| interpreted incorrectly by GDB now - GCC PR debug/48229. */ |
| } |
| else if (producer_is_gcc (cu->producer, &major, &minor)) |
| { |
| cu->producer_is_gxx_lt_4_6 = major < 4 || (major == 4 && minor < 6); |
| cu->producer_is_gcc_lt_4_3 = major < 4 || (major == 4 && minor < 3); |
| } |
| else if (startswith (cu->producer, "Intel(R) C")) |
| cu->producer_is_icc = 1; |
| else |
| { |
| /* For other non-GCC compilers, expect their behavior is DWARF version |
| compliant. */ |
| } |
| |
| cu->checked_producer = 1; |
| } |
| |
| /* Check for GCC PR debug/45124 fix which is not present in any G++ version up |
| to 4.5.any while it is present already in G++ 4.6.0 - the PR has been fixed |
| during 4.6.0 experimental. */ |
| |
| static int |
| producer_is_gxx_lt_4_6 (struct dwarf2_cu *cu) |
| { |
| if (!cu->checked_producer) |
| check_producer (cu); |
| |
| return cu->producer_is_gxx_lt_4_6; |
| } |
| |
| /* Return the default accessibility type if it is not overriden by |
| DW_AT_accessibility. */ |
| |
| static enum dwarf_access_attribute |
| dwarf2_default_access_attribute (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| if (cu->header.version < 3 || producer_is_gxx_lt_4_6 (cu)) |
| { |
| /* The default DWARF 2 accessibility for members is public, the default |
| accessibility for inheritance is private. */ |
| |
| if (die->tag != DW_TAG_inheritance) |
| return DW_ACCESS_public; |
| else |
| return DW_ACCESS_private; |
| } |
| else |
| { |
| /* DWARF 3+ defines the default accessibility a different way. The same |
| rules apply now for DW_TAG_inheritance as for the members and it only |
| depends on the container kind. */ |
| |
| if (die->parent->tag == DW_TAG_class_type) |
| return DW_ACCESS_private; |
| else |
| return DW_ACCESS_public; |
| } |
| } |
| |
| /* Look for DW_AT_data_member_location. Set *OFFSET to the byte |
| offset. If the attribute was not found return 0, otherwise return |
| 1. If it was found but could not properly be handled, set *OFFSET |
| to 0. */ |
| |
| static int |
| handle_data_member_location (struct die_info *die, struct dwarf2_cu *cu, |
| LONGEST *offset) |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_data_member_location, cu); |
| if (attr != NULL) |
| { |
| *offset = 0; |
| |
| /* Note that we do not check for a section offset first here. |
| This is because DW_AT_data_member_location is new in DWARF 4, |
| so if we see it, we can assume that a constant form is really |
| a constant and not a section offset. */ |
| if (attr_form_is_constant (attr)) |
| *offset = dwarf2_get_attr_constant_value (attr, 0); |
| else if (attr_form_is_section_offset (attr)) |
| dwarf2_complex_location_expr_complaint (); |
| else if (attr_form_is_block (attr)) |
| *offset = decode_locdesc (DW_BLOCK (attr), cu); |
| else |
| dwarf2_complex_location_expr_complaint (); |
| |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Add an aggregate field to the field list. */ |
| |
| static void |
| dwarf2_add_field (struct field_info *fip, struct die_info *die, |
| struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct nextfield *new_field; |
| struct attribute *attr; |
| struct field *fp; |
| const char *fieldname = ""; |
| |
| /* Allocate a new field list entry and link it in. */ |
| new_field = XNEW (struct nextfield); |
| make_cleanup (xfree, new_field); |
| memset (new_field, 0, sizeof (struct nextfield)); |
| |
| if (die->tag == DW_TAG_inheritance) |
| { |
| new_field->next = fip->baseclasses; |
| fip->baseclasses = new_field; |
| } |
| else |
| { |
| new_field->next = fip->fields; |
| fip->fields = new_field; |
| } |
| fip->nfields++; |
| |
| attr = dwarf2_attr (die, DW_AT_accessibility, cu); |
| if (attr) |
| new_field->accessibility = DW_UNSND (attr); |
| else |
| new_field->accessibility = dwarf2_default_access_attribute (die, cu); |
| if (new_field->accessibility != DW_ACCESS_public) |
| fip->non_public_fields = 1; |
| |
| attr = dwarf2_attr (die, DW_AT_virtuality, cu); |
| if (attr) |
| new_field->virtuality = DW_UNSND (attr); |
| else |
| new_field->virtuality = DW_VIRTUALITY_none; |
| |
| fp = &new_field->field; |
| |
| if (die->tag == DW_TAG_member && ! die_is_declaration (die, cu)) |
| { |
| LONGEST offset; |
| |
| /* Data member other than a C++ static data member. */ |
| |
| /* Get type of field. */ |
| fp->type = die_type (die, cu); |
| |
| SET_FIELD_BITPOS (*fp, 0); |
| |
| /* Get bit size of field (zero if none). */ |
| attr = dwarf2_attr (die, DW_AT_bit_size, cu); |
| if (attr) |
| { |
| FIELD_BITSIZE (*fp) = DW_UNSND (attr); |
| } |
| else |
| { |
| FIELD_BITSIZE (*fp) = 0; |
| } |
| |
| /* Get bit offset of field. */ |
| if (handle_data_member_location (die, cu, &offset)) |
| SET_FIELD_BITPOS (*fp, offset * bits_per_byte); |
| attr = dwarf2_attr (die, DW_AT_bit_offset, cu); |
| if (attr) |
| { |
| if (gdbarch_bits_big_endian (gdbarch)) |
| { |
| /* For big endian bits, the DW_AT_bit_offset gives the |
| additional bit offset from the MSB of the containing |
| anonymous object to the MSB of the field. We don't |
| have to do anything special since we don't need to |
| know the size of the anonymous object. */ |
| SET_FIELD_BITPOS (*fp, FIELD_BITPOS (*fp) + DW_UNSND (attr)); |
| } |
| else |
| { |
| /* For little endian bits, compute the bit offset to the |
| MSB of the anonymous object, subtract off the number of |
| bits from the MSB of the field to the MSB of the |
| object, and then subtract off the number of bits of |
| the field itself. The result is the bit offset of |
| the LSB of the field. */ |
| int anonymous_size; |
| int bit_offset = DW_UNSND (attr); |
| |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| /* The size of the anonymous object containing |
| the bit field is explicit, so use the |
| indicated size (in bytes). */ |
| anonymous_size = DW_UNSND (attr); |
| } |
| else |
| { |
| /* The size of the anonymous object containing |
| the bit field must be inferred from the type |
| attribute of the data member containing the |
| bit field. */ |
| anonymous_size = TYPE_LENGTH (fp->type); |
| } |
| SET_FIELD_BITPOS (*fp, |
| (FIELD_BITPOS (*fp) |
| + anonymous_size * bits_per_byte |
| - bit_offset - FIELD_BITSIZE (*fp))); |
| } |
| } |
| attr = dwarf2_attr (die, DW_AT_data_bit_offset, cu); |
| if (attr != NULL) |
| SET_FIELD_BITPOS (*fp, (FIELD_BITPOS (*fp) |
| + dwarf2_get_attr_constant_value (attr, 0))); |
| |
| /* Get name of field. */ |
| fieldname = dwarf2_name (die, cu); |
| if (fieldname == NULL) |
| fieldname = ""; |
| |
| /* The name is already allocated along with this objfile, so we don't |
| need to duplicate it for the type. */ |
| fp->name = fieldname; |
| |
| /* Change accessibility for artificial fields (e.g. virtual table |
| pointer or virtual base class pointer) to private. */ |
| if (dwarf2_attr (die, DW_AT_artificial, cu)) |
| { |
| FIELD_ARTIFICIAL (*fp) = 1; |
| new_field->accessibility = DW_ACCESS_private; |
| fip->non_public_fields = 1; |
| } |
| } |
| else if (die->tag == DW_TAG_member || die->tag == DW_TAG_variable) |
| { |
| /* C++ static member. */ |
| |
| /* NOTE: carlton/2002-11-05: It should be a DW_TAG_member that |
| is a declaration, but all versions of G++ as of this writing |
| (so through at least 3.2.1) incorrectly generate |
| DW_TAG_variable tags. */ |
| |
| const char *physname; |
| |
| /* Get name of field. */ |
| fieldname = dwarf2_name (die, cu); |
| if (fieldname == NULL) |
| return; |
| |
| attr = dwarf2_attr (die, DW_AT_const_value, cu); |
| if (attr |
| /* Only create a symbol if this is an external value. |
| new_symbol checks this and puts the value in the global symbol |
| table, which we want. If it is not external, new_symbol |
| will try to put the value in cu->list_in_scope which is wrong. */ |
| && dwarf2_flag_true_p (die, DW_AT_external, cu)) |
| { |
| /* A static const member, not much different than an enum as far as |
| we're concerned, except that we can support more types. */ |
| new_symbol (die, NULL, cu); |
| } |
| |
| /* Get physical name. */ |
| physname = dwarf2_physname (fieldname, die, cu); |
| |
| /* The name is already allocated along with this objfile, so we don't |
| need to duplicate it for the type. */ |
| SET_FIELD_PHYSNAME (*fp, physname ? physname : ""); |
| FIELD_TYPE (*fp) = die_type (die, cu); |
| FIELD_NAME (*fp) = fieldname; |
| } |
| else if (die->tag == DW_TAG_inheritance) |
| { |
| LONGEST offset; |
| |
| /* C++ base class field. */ |
| if (handle_data_member_location (die, cu, &offset)) |
| SET_FIELD_BITPOS (*fp, offset * bits_per_byte); |
| FIELD_BITSIZE (*fp) = 0; |
| FIELD_TYPE (*fp) = die_type (die, cu); |
| FIELD_NAME (*fp) = type_name_no_tag (fp->type); |
| fip->nbaseclasses++; |
| } |
| } |
| |
| /* Add a typedef defined in the scope of the FIP's class. */ |
| |
| static void |
| dwarf2_add_typedef (struct field_info *fip, struct die_info *die, |
| struct dwarf2_cu *cu) |
| { |
| struct typedef_field_list *new_field; |
| struct typedef_field *fp; |
| |
| /* Allocate a new field list entry and link it in. */ |
| new_field = XCNEW (struct typedef_field_list); |
| make_cleanup (xfree, new_field); |
| |
| gdb_assert (die->tag == DW_TAG_typedef); |
| |
| fp = &new_field->field; |
| |
| /* Get name of field. */ |
| fp->name = dwarf2_name (die, cu); |
| if (fp->name == NULL) |
| return; |
| |
| fp->type = read_type_die (die, cu); |
| |
| new_field->next = fip->typedef_field_list; |
| fip->typedef_field_list = new_field; |
| fip->typedef_field_list_count++; |
| } |
| |
| /* Create the vector of fields, and attach it to the type. */ |
| |
| static void |
| dwarf2_attach_fields_to_type (struct field_info *fip, struct type *type, |
| struct dwarf2_cu *cu) |
| { |
| int nfields = fip->nfields; |
| |
| /* Record the field count, allocate space for the array of fields, |
| and create blank accessibility bitfields if necessary. */ |
| TYPE_NFIELDS (type) = nfields; |
| TYPE_FIELDS (type) = (struct field *) |
| TYPE_ALLOC (type, sizeof (struct field) * nfields); |
| memset (TYPE_FIELDS (type), 0, sizeof (struct field) * nfields); |
| |
| if (fip->non_public_fields && cu->language != language_ada) |
| { |
| ALLOCATE_CPLUS_STRUCT_TYPE (type); |
| |
| TYPE_FIELD_PRIVATE_BITS (type) = |
| (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); |
| B_CLRALL (TYPE_FIELD_PRIVATE_BITS (type), nfields); |
| |
| TYPE_FIELD_PROTECTED_BITS (type) = |
| (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); |
| B_CLRALL (TYPE_FIELD_PROTECTED_BITS (type), nfields); |
| |
| TYPE_FIELD_IGNORE_BITS (type) = |
| (B_TYPE *) TYPE_ALLOC (type, B_BYTES (nfields)); |
| B_CLRALL (TYPE_FIELD_IGNORE_BITS (type), nfields); |
| } |
| |
| /* If the type has baseclasses, allocate and clear a bit vector for |
| TYPE_FIELD_VIRTUAL_BITS. */ |
| if (fip->nbaseclasses && cu->language != language_ada) |
| { |
| int num_bytes = B_BYTES (fip->nbaseclasses); |
| unsigned char *pointer; |
| |
| ALLOCATE_CPLUS_STRUCT_TYPE (type); |
| pointer = (unsigned char *) TYPE_ALLOC (type, num_bytes); |
| TYPE_FIELD_VIRTUAL_BITS (type) = pointer; |
| B_CLRALL (TYPE_FIELD_VIRTUAL_BITS (type), fip->nbaseclasses); |
| TYPE_N_BASECLASSES (type) = fip->nbaseclasses; |
| } |
| |
| /* Copy the saved-up fields into the field vector. Start from the head of |
| the list, adding to the tail of the field array, so that they end up in |
| the same order in the array in which they were added to the list. */ |
| while (nfields-- > 0) |
| { |
| struct nextfield *fieldp; |
| |
| if (fip->fields) |
| { |
| fieldp = fip->fields; |
| fip->fields = fieldp->next; |
| } |
| else |
| { |
| fieldp = fip->baseclasses; |
| fip->baseclasses = fieldp->next; |
| } |
| |
| TYPE_FIELD (type, nfields) = fieldp->field; |
| switch (fieldp->accessibility) |
| { |
| case DW_ACCESS_private: |
| if (cu->language != language_ada) |
| SET_TYPE_FIELD_PRIVATE (type, nfields); |
| break; |
| |
| case DW_ACCESS_protected: |
| if (cu->language != language_ada) |
| SET_TYPE_FIELD_PROTECTED (type, nfields); |
| break; |
| |
| case DW_ACCESS_public: |
| break; |
| |
| default: |
| /* Unknown accessibility. Complain and treat it as public. */ |
| { |
| complaint (&symfile_complaints, _("unsupported accessibility %d"), |
| fieldp->accessibility); |
| } |
| break; |
| } |
| if (nfields < fip->nbaseclasses) |
| { |
| switch (fieldp->virtuality) |
| { |
| case DW_VIRTUALITY_virtual: |
| case DW_VIRTUALITY_pure_virtual: |
| if (cu->language == language_ada) |
| error (_("unexpected virtuality in component of Ada type")); |
| SET_TYPE_FIELD_VIRTUAL (type, nfields); |
| break; |
| } |
| } |
| } |
| } |
| |
| /* Return true if this member function is a constructor, false |
| otherwise. */ |
| |
| static int |
| dwarf2_is_constructor (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| const char *fieldname; |
| const char *type_name; |
| int len; |
| |
| if (die->parent == NULL) |
| return 0; |
| |
| if (die->parent->tag != DW_TAG_structure_type |
| && die->parent->tag != DW_TAG_union_type |
| && die->parent->tag != DW_TAG_class_type) |
| return 0; |
| |
| fieldname = dwarf2_name (die, cu); |
| type_name = dwarf2_name (die->parent, cu); |
| if (fieldname == NULL || type_name == NULL) |
| return 0; |
| |
| len = strlen (fieldname); |
| return (strncmp (fieldname, type_name, len) == 0 |
| && (type_name[len] == '\0' || type_name[len] == '<')); |
| } |
| |
| /* Add a member function to the proper fieldlist. */ |
| |
| static void |
| dwarf2_add_member_fn (struct field_info *fip, struct die_info *die, |
| struct type *type, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct attribute *attr; |
| struct fnfieldlist *flp; |
| int i; |
| struct fn_field *fnp; |
| const char *fieldname; |
| struct nextfnfield *new_fnfield; |
| struct type *this_type; |
| enum dwarf_access_attribute accessibility; |
| |
| if (cu->language == language_ada) |
| error (_("unexpected member function in Ada type")); |
| |
| /* Get name of member function. */ |
| fieldname = dwarf2_name (die, cu); |
| if (fieldname == NULL) |
| return; |
| |
| /* Look up member function name in fieldlist. */ |
| for (i = 0; i < fip->nfnfields; i++) |
| { |
| if (strcmp (fip->fnfieldlists[i].name, fieldname) == 0) |
| break; |
| } |
| |
| /* Create new list element if necessary. */ |
| if (i < fip->nfnfields) |
| flp = &fip->fnfieldlists[i]; |
| else |
| { |
| if ((fip->nfnfields % DW_FIELD_ALLOC_CHUNK) == 0) |
| { |
| fip->fnfieldlists = (struct fnfieldlist *) |
| xrealloc (fip->fnfieldlists, |
| (fip->nfnfields + DW_FIELD_ALLOC_CHUNK) |
| * sizeof (struct fnfieldlist)); |
| if (fip->nfnfields == 0) |
| make_cleanup (free_current_contents, &fip->fnfieldlists); |
| } |
| flp = &fip->fnfieldlists[fip->nfnfields]; |
| flp->name = fieldname; |
| flp->length = 0; |
| flp->head = NULL; |
| i = fip->nfnfields++; |
| } |
| |
| /* Create a new member function field and chain it to the field list |
| entry. */ |
| new_fnfield = XNEW (struct nextfnfield); |
| make_cleanup (xfree, new_fnfield); |
| memset (new_fnfield, 0, sizeof (struct nextfnfield)); |
| new_fnfield->next = flp->head; |
| flp->head = new_fnfield; |
| flp->length++; |
| |
| /* Fill in the member function field info. */ |
| fnp = &new_fnfield->fnfield; |
| |
| /* Delay processing of the physname until later. */ |
| if (cu->language == language_cplus) |
| { |
| add_to_method_list (type, i, flp->length - 1, fieldname, |
| die, cu); |
| } |
| else |
| { |
| const char *physname = dwarf2_physname (fieldname, die, cu); |
| fnp->physname = physname ? physname : ""; |
| } |
| |
| fnp->type = alloc_type (objfile); |
| this_type = read_type_die (die, cu); |
| if (this_type && TYPE_CODE (this_type) == TYPE_CODE_FUNC) |
| { |
| int nparams = TYPE_NFIELDS (this_type); |
| |
| /* TYPE is the domain of this method, and THIS_TYPE is the type |
| of the method itself (TYPE_CODE_METHOD). */ |
| smash_to_method_type (fnp->type, type, |
| TYPE_TARGET_TYPE (this_type), |
| TYPE_FIELDS (this_type), |
| TYPE_NFIELDS (this_type), |
| TYPE_VARARGS (this_type)); |
| |
| /* Handle static member functions. |
| Dwarf2 has no clean way to discern C++ static and non-static |
| member functions. G++ helps GDB by marking the first |
| parameter for non-static member functions (which is the this |
| pointer) as artificial. We obtain this information from |
| read_subroutine_type via TYPE_FIELD_ARTIFICIAL. */ |
| if (nparams == 0 || TYPE_FIELD_ARTIFICIAL (this_type, 0) == 0) |
| fnp->voffset = VOFFSET_STATIC; |
| } |
| else |
| complaint (&symfile_complaints, _("member function type missing for '%s'"), |
| dwarf2_full_name (fieldname, die, cu)); |
| |
| /* Get fcontext from DW_AT_containing_type if present. */ |
| if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) |
| fnp->fcontext = die_containing_type (die, cu); |
| |
| /* dwarf2 doesn't have stubbed physical names, so the setting of is_const and |
| is_volatile is irrelevant, as it is needed by gdb_mangle_name only. */ |
| |
| /* Get accessibility. */ |
| attr = dwarf2_attr (die, DW_AT_accessibility, cu); |
| if (attr) |
| accessibility = (enum dwarf_access_attribute) DW_UNSND (attr); |
| else |
| accessibility = dwarf2_default_access_attribute (die, cu); |
| switch (accessibility) |
| { |
| case DW_ACCESS_private: |
| fnp->is_private = 1; |
| break; |
| case DW_ACCESS_protected: |
| fnp->is_protected = 1; |
| break; |
| } |
| |
| /* Check for artificial methods. */ |
| attr = dwarf2_attr (die, DW_AT_artificial, cu); |
| if (attr && DW_UNSND (attr) != 0) |
| fnp->is_artificial = 1; |
| |
| fnp->is_constructor = dwarf2_is_constructor (die, cu); |
| |
| /* Get index in virtual function table if it is a virtual member |
| function. For older versions of GCC, this is an offset in the |
| appropriate virtual table, as specified by DW_AT_containing_type. |
| For everyone else, it is an expression to be evaluated relative |
| to the object address. */ |
| |
| attr = dwarf2_attr (die, DW_AT_vtable_elem_location, cu); |
| if (attr) |
| { |
| if (attr_form_is_block (attr) && DW_BLOCK (attr)->size > 0) |
| { |
| if (DW_BLOCK (attr)->data[0] == DW_OP_constu) |
| { |
| /* Old-style GCC. */ |
| fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu) + 2; |
| } |
| else if (DW_BLOCK (attr)->data[0] == DW_OP_deref |
| || (DW_BLOCK (attr)->size > 1 |
| && DW_BLOCK (attr)->data[0] == DW_OP_deref_size |
| && DW_BLOCK (attr)->data[1] == cu->header.addr_size)) |
| { |
| fnp->voffset = decode_locdesc (DW_BLOCK (attr), cu); |
| if ((fnp->voffset % cu->header.addr_size) != 0) |
| dwarf2_complex_location_expr_complaint (); |
| else |
| fnp->voffset /= cu->header.addr_size; |
| fnp->voffset += 2; |
| } |
| else |
| dwarf2_complex_location_expr_complaint (); |
| |
| if (!fnp->fcontext) |
| { |
| /* If there is no `this' field and no DW_AT_containing_type, |
| we cannot actually find a base class context for the |
| vtable! */ |
| if (TYPE_NFIELDS (this_type) == 0 |
| || !TYPE_FIELD_ARTIFICIAL (this_type, 0)) |
| { |
| complaint (&symfile_complaints, |
| _("cannot determine context for virtual member " |
| "function \"%s\" (offset %d)"), |
| fieldname, die->offset.sect_off); |
| } |
| else |
| { |
| fnp->fcontext |
| = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (this_type, 0)); |
| } |
| } |
| } |
| else if (attr_form_is_section_offset (attr)) |
| { |
| dwarf2_complex_location_expr_complaint (); |
| } |
| else |
| { |
| dwarf2_invalid_attrib_class_complaint ("DW_AT_vtable_elem_location", |
| fieldname); |
| } |
| } |
| else |
| { |
| attr = dwarf2_attr (die, DW_AT_virtuality, cu); |
| if (attr && DW_UNSND (attr)) |
| { |
| /* GCC does this, as of 2008-08-25; PR debug/37237. */ |
| complaint (&symfile_complaints, |
| _("Member function \"%s\" (offset %d) is virtual " |
| "but the vtable offset is not specified"), |
| fieldname, die->offset.sect_off); |
| ALLOCATE_CPLUS_STRUCT_TYPE (type); |
| TYPE_CPLUS_DYNAMIC (type) = 1; |
| } |
| } |
| } |
| |
| /* Create the vector of member function fields, and attach it to the type. */ |
| |
| static void |
| dwarf2_attach_fn_fields_to_type (struct field_info *fip, struct type *type, |
| struct dwarf2_cu *cu) |
| { |
| struct fnfieldlist *flp; |
| int i; |
| |
| if (cu->language == language_ada) |
| error (_("unexpected member functions in Ada type")); |
| |
| ALLOCATE_CPLUS_STRUCT_TYPE (type); |
| TYPE_FN_FIELDLISTS (type) = (struct fn_fieldlist *) |
| TYPE_ALLOC (type, sizeof (struct fn_fieldlist) * fip->nfnfields); |
| |
| for (i = 0, flp = fip->fnfieldlists; i < fip->nfnfields; i++, flp++) |
| { |
| struct nextfnfield *nfp = flp->head; |
| struct fn_fieldlist *fn_flp = &TYPE_FN_FIELDLIST (type, i); |
| int k; |
| |
| TYPE_FN_FIELDLIST_NAME (type, i) = flp->name; |
| TYPE_FN_FIELDLIST_LENGTH (type, i) = flp->length; |
| fn_flp->fn_fields = (struct fn_field *) |
| TYPE_ALLOC (type, sizeof (struct fn_field) * flp->length); |
| for (k = flp->length; (k--, nfp); nfp = nfp->next) |
| fn_flp->fn_fields[k] = nfp->fnfield; |
| } |
| |
| TYPE_NFN_FIELDS (type) = fip->nfnfields; |
| } |
| |
| /* Returns non-zero if NAME is the name of a vtable member in CU's |
| language, zero otherwise. */ |
| static int |
| is_vtable_name (const char *name, struct dwarf2_cu *cu) |
| { |
| static const char vptr[] = "_vptr"; |
| static const char vtable[] = "vtable"; |
| |
| /* Look for the C++ form of the vtable. */ |
| if (startswith (name, vptr) && is_cplus_marker (name[sizeof (vptr) - 1])) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* GCC outputs unnamed structures that are really pointers to member |
| functions, with the ABI-specified layout. If TYPE describes |
| such a structure, smash it into a member function type. |
| |
| GCC shouldn't do this; it should just output pointer to member DIEs. |
| This is GCC PR debug/28767. */ |
| |
| static void |
| quirk_gcc_member_function_pointer (struct type *type, struct objfile *objfile) |
| { |
| struct type *pfn_type, *self_type, *new_type; |
| |
| /* Check for a structure with no name and two children. */ |
| if (TYPE_CODE (type) != TYPE_CODE_STRUCT || TYPE_NFIELDS (type) != 2) |
| return; |
| |
| /* Check for __pfn and __delta members. */ |
| if (TYPE_FIELD_NAME (type, 0) == NULL |
| || strcmp (TYPE_FIELD_NAME (type, 0), "__pfn") != 0 |
| || TYPE_FIELD_NAME (type, 1) == NULL |
| || strcmp (TYPE_FIELD_NAME (type, 1), "__delta") != 0) |
| return; |
| |
| /* Find the type of the method. */ |
| pfn_type = TYPE_FIELD_TYPE (type, 0); |
| if (pfn_type == NULL |
| || TYPE_CODE (pfn_type) != TYPE_CODE_PTR |
| || TYPE_CODE (TYPE_TARGET_TYPE (pfn_type)) != TYPE_CODE_FUNC) |
| return; |
| |
| /* Look for the "this" argument. */ |
| pfn_type = TYPE_TARGET_TYPE (pfn_type); |
| if (TYPE_NFIELDS (pfn_type) == 0 |
| /* || TYPE_FIELD_TYPE (pfn_type, 0) == NULL */ |
| || TYPE_CODE (TYPE_FIELD_TYPE (pfn_type, 0)) != TYPE_CODE_PTR) |
| return; |
| |
| self_type = TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (pfn_type, 0)); |
| new_type = alloc_type (objfile); |
| smash_to_method_type (new_type, self_type, TYPE_TARGET_TYPE (pfn_type), |
| TYPE_FIELDS (pfn_type), TYPE_NFIELDS (pfn_type), |
| TYPE_VARARGS (pfn_type)); |
| smash_to_methodptr_type (type, new_type); |
| } |
| |
| /* Return non-zero if the CU's PRODUCER string matches the Intel C/C++ compiler |
| (icc). */ |
| |
| static int |
| producer_is_icc (struct dwarf2_cu *cu) |
| { |
| if (!cu->checked_producer) |
| check_producer (cu); |
| |
| return cu->producer_is_icc; |
| } |
| |
| /* Called when we find the DIE that starts a structure or union scope |
| (definition) to create a type for the structure or union. Fill in |
| the type's name and general properties; the members will not be |
| processed until process_structure_scope. A symbol table entry for |
| the type will also not be done until process_structure_scope (assuming |
| the type has a name). |
| |
| NOTE: we need to call these functions regardless of whether or not the |
| DIE has a DW_AT_name attribute, since it might be an anonymous |
| structure or union. This gets the type entered into our set of |
| user defined types. */ |
| |
| static struct type * |
| read_structure_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct type *type; |
| struct attribute *attr; |
| const char *name; |
| |
| /* If the definition of this type lives in .debug_types, read that type. |
| Don't follow DW_AT_specification though, that will take us back up |
| the chain and we want to go down. */ |
| attr = dwarf2_attr_no_follow (die, DW_AT_signature); |
| if (attr) |
| { |
| type = get_DW_AT_signature_type (die, attr, cu); |
| |
| /* The type's CU may not be the same as CU. |
| Ensure TYPE is recorded with CU in die_type_hash. */ |
| return set_die_type (die, type, cu); |
| } |
| |
| type = alloc_type (objfile); |
| INIT_CPLUS_SPECIFIC (type); |
| |
| name = dwarf2_name (die, cu); |
| if (name != NULL) |
| { |
| if (cu->language == language_cplus |
| || cu->language == language_d |
| || cu->language == language_rust) |
| { |
| const char *full_name = dwarf2_full_name (name, die, cu); |
| |
| /* dwarf2_full_name might have already finished building the DIE's |
| type. If so, there is no need to continue. */ |
| if (get_die_type (die, cu) != NULL) |
| return get_die_type (die, cu); |
| |
| TYPE_TAG_NAME (type) = full_name; |
| if (die->tag == DW_TAG_structure_type |
| || die->tag == DW_TAG_class_type) |
| TYPE_NAME (type) = TYPE_TAG_NAME (type); |
| } |
| else |
| { |
| /* The name is already allocated along with this objfile, so |
| we don't need to duplicate it for the type. */ |
| TYPE_TAG_NAME (type) = name; |
| if (die->tag == DW_TAG_class_type) |
| TYPE_NAME (type) = TYPE_TAG_NAME (type); |
| } |
| } |
| |
| if (die->tag == DW_TAG_structure_type) |
| { |
| TYPE_CODE (type) = TYPE_CODE_STRUCT; |
| } |
| else if (die->tag == DW_TAG_union_type) |
| { |
| TYPE_CODE (type) = TYPE_CODE_UNION; |
| } |
| else |
| { |
| TYPE_CODE (type) = TYPE_CODE_STRUCT; |
| } |
| |
| if (cu->language == language_cplus && die->tag == DW_TAG_class_type) |
| TYPE_DECLARED_CLASS (type) = 1; |
| |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| if (attr_form_is_constant (attr)) |
| TYPE_LENGTH (type) = DW_UNSND (attr); |
| else |
| { |
| /* For the moment, dynamic type sizes are not supported |
| by GDB's struct type. The actual size is determined |
| on-demand when resolving the type of a given object, |
| so set the type's length to zero for now. Otherwise, |
| we record an expression as the length, and that expression |
| could lead to a very large value, which could eventually |
| lead to us trying to allocate that much memory when creating |
| a value of that type. */ |
| TYPE_LENGTH (type) = 0; |
| } |
| } |
| else |
| { |
| TYPE_LENGTH (type) = 0; |
| } |
| |
| if (producer_is_icc (cu) && (TYPE_LENGTH (type) == 0)) |
| { |
| /* ICC does not output the required DW_AT_declaration |
| on incomplete types, but gives them a size of zero. */ |
| TYPE_STUB (type) = 1; |
| } |
| else |
| TYPE_STUB_SUPPORTED (type) = 1; |
| |
| if (die_is_declaration (die, cu)) |
| TYPE_STUB (type) = 1; |
| else if (attr == NULL && die->child == NULL |
| && producer_is_realview (cu->producer)) |
| /* RealView does not output the required DW_AT_declaration |
| on incomplete types. */ |
| TYPE_STUB (type) = 1; |
| |
| /* We need to add the type field to the die immediately so we don't |
| infinitely recurse when dealing with pointers to the structure |
| type within the structure itself. */ |
| set_die_type (die, type, cu); |
| |
| /* set_die_type should be already done. */ |
| set_descriptive_type (type, die, cu); |
| |
| return type; |
| } |
| |
| /* Finish creating a structure or union type, including filling in |
| its members and creating a symbol for it. */ |
| |
| static void |
| process_structure_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct die_info *child_die; |
| struct type *type; |
| |
| type = get_die_type (die, cu); |
| if (type == NULL) |
| type = read_structure_type (die, cu); |
| |
| if (die->child != NULL && ! die_is_declaration (die, cu)) |
| { |
| struct field_info fi; |
| VEC (symbolp) *template_args = NULL; |
| struct cleanup *back_to = make_cleanup (null_cleanup, 0); |
| |
| memset (&fi, 0, sizeof (struct field_info)); |
| |
| child_die = die->child; |
| |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_member |
| || child_die->tag == DW_TAG_variable) |
| { |
| /* NOTE: carlton/2002-11-05: A C++ static data member |
| should be a DW_TAG_member that is a declaration, but |
| all versions of G++ as of this writing (so through at |
| least 3.2.1) incorrectly generate DW_TAG_variable |
| tags for them instead. */ |
| dwarf2_add_field (&fi, child_die, cu); |
| } |
| else if (child_die->tag == DW_TAG_subprogram) |
| { |
| /* Rust doesn't have member functions in the C++ sense. |
| However, it does emit ordinary functions as children |
| of a struct DIE. */ |
| if (cu->language == language_rust) |
| read_func_scope (child_die, cu); |
| else |
| { |
| /* C++ member function. */ |
| dwarf2_add_member_fn (&fi, child_die, type, cu); |
| } |
| } |
| else if (child_die->tag == DW_TAG_inheritance) |
| { |
| /* C++ base class field. */ |
| dwarf2_add_field (&fi, child_die, cu); |
| } |
| else if (child_die->tag == DW_TAG_typedef) |
| dwarf2_add_typedef (&fi, child_die, cu); |
| else if (child_die->tag == DW_TAG_template_type_param |
| || child_die->tag == DW_TAG_template_value_param) |
| { |
| struct symbol *arg = new_symbol (child_die, NULL, cu); |
| |
| if (arg != NULL) |
| VEC_safe_push (symbolp, template_args, arg); |
| } |
| |
| child_die = sibling_die (child_die); |
| } |
| |
| /* Attach template arguments to type. */ |
| if (! VEC_empty (symbolp, template_args)) |
| { |
| ALLOCATE_CPLUS_STRUCT_TYPE (type); |
| TYPE_N_TEMPLATE_ARGUMENTS (type) |
| = VEC_length (symbolp, template_args); |
| TYPE_TEMPLATE_ARGUMENTS (type) |
| = XOBNEWVEC (&objfile->objfile_obstack, |
| struct symbol *, |
| TYPE_N_TEMPLATE_ARGUMENTS (type)); |
| memcpy (TYPE_TEMPLATE_ARGUMENTS (type), |
| VEC_address (symbolp, template_args), |
| (TYPE_N_TEMPLATE_ARGUMENTS (type) |
| * sizeof (struct symbol *))); |
| VEC_free (symbolp, template_args); |
| } |
| |
| /* Attach fields and member functions to the type. */ |
| if (fi.nfields) |
| dwarf2_attach_fields_to_type (&fi, type, cu); |
| if (fi.nfnfields) |
| { |
| dwarf2_attach_fn_fields_to_type (&fi, type, cu); |
| |
| /* Get the type which refers to the base class (possibly this |
| class itself) which contains the vtable pointer for the current |
| class from the DW_AT_containing_type attribute. This use of |
| DW_AT_containing_type is a GNU extension. */ |
| |
| if (dwarf2_attr (die, DW_AT_containing_type, cu) != NULL) |
| { |
| struct type *t = die_containing_type (die, cu); |
| |
| set_type_vptr_basetype (type, t); |
| if (type == t) |
| { |
| int i; |
| |
| /* Our own class provides vtbl ptr. */ |
| for (i = TYPE_NFIELDS (t) - 1; |
| i >= TYPE_N_BASECLASSES (t); |
| --i) |
| { |
| const char *fieldname = TYPE_FIELD_NAME (t, i); |
| |
| if (is_vtable_name (fieldname, cu)) |
| { |
| set_type_vptr_fieldno (type, i); |
| break; |
| } |
| } |
| |
| /* Complain if virtual function table field not found. */ |
| if (i < TYPE_N_BASECLASSES (t)) |
| complaint (&symfile_complaints, |
| _("virtual function table pointer " |
| "not found when defining class '%s'"), |
| TYPE_TAG_NAME (type) ? TYPE_TAG_NAME (type) : |
| ""); |
| } |
| else |
| { |
| set_type_vptr_fieldno (type, TYPE_VPTR_FIELDNO (t)); |
| } |
| } |
| else if (cu->producer |
| && startswith (cu->producer, "IBM(R) XL C/C++ Advanced Edition")) |
| { |
| /* The IBM XLC compiler does not provide direct indication |
| of the containing type, but the vtable pointer is |
| always named __vfp. */ |
| |
| int i; |
| |
| for (i = TYPE_NFIELDS (type) - 1; |
| i >= TYPE_N_BASECLASSES (type); |
| --i) |
| { |
| if (strcmp (TYPE_FIELD_NAME (type, i), "__vfp") == 0) |
| { |
| set_type_vptr_fieldno (type, i); |
| set_type_vptr_basetype (type, type); |
| break; |
| } |
| } |
| } |
| } |
| |
| /* Copy fi.typedef_field_list linked list elements content into the |
| allocated array TYPE_TYPEDEF_FIELD_ARRAY (type). */ |
| if (fi.typedef_field_list) |
| { |
| int i = fi.typedef_field_list_count; |
| |
| ALLOCATE_CPLUS_STRUCT_TYPE (type); |
| TYPE_TYPEDEF_FIELD_ARRAY (type) |
| = ((struct typedef_field *) |
| TYPE_ALLOC (type, sizeof (TYPE_TYPEDEF_FIELD (type, 0)) * i)); |
| TYPE_TYPEDEF_FIELD_COUNT (type) = i; |
| |
| /* Reverse the list order to keep the debug info elements order. */ |
| while (--i >= 0) |
| { |
| struct typedef_field *dest, *src; |
| |
| dest = &TYPE_TYPEDEF_FIELD (type, i); |
| src = &fi.typedef_field_list->field; |
| fi.typedef_field_list = fi.typedef_field_list->next; |
| *dest = *src; |
| } |
| } |
| |
| do_cleanups (back_to); |
| } |
| |
| quirk_gcc_member_function_pointer (type, objfile); |
| |
| /* NOTE: carlton/2004-03-16: GCC 3.4 (or at least one of its |
| snapshots) has been known to create a die giving a declaration |
| for a class that has, as a child, a die giving a definition for a |
| nested class. So we have to process our children even if the |
| current die is a declaration. Normally, of course, a declaration |
| won't have any children at all. */ |
| |
| child_die = die->child; |
| |
| while (child_die != NULL && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_member |
| || child_die->tag == DW_TAG_variable |
| || child_die->tag == DW_TAG_inheritance |
| || child_die->tag == DW_TAG_template_value_param |
| || child_die->tag == DW_TAG_template_type_param) |
| { |
| /* Do nothing. */ |
| } |
| else |
| process_die (child_die, cu); |
| |
| child_die = sibling_die (child_die); |
| } |
| |
| /* Do not consider external references. According to the DWARF standard, |
| these DIEs are identified by the fact that they have no byte_size |
| attribute, and a declaration attribute. */ |
| if (dwarf2_attr (die, DW_AT_byte_size, cu) != NULL |
| || !die_is_declaration (die, cu)) |
| new_symbol (die, type, cu); |
| } |
| |
| /* Assuming DIE is an enumeration type, and TYPE is its associated type, |
| update TYPE using some information only available in DIE's children. */ |
| |
| static void |
| update_enumeration_type_from_children (struct die_info *die, |
| struct type *type, |
| struct dwarf2_cu *cu) |
| { |
| struct obstack obstack; |
| struct die_info *child_die; |
| int unsigned_enum = 1; |
| int flag_enum = 1; |
| ULONGEST mask = 0; |
| struct cleanup *old_chain; |
| |
| obstack_init (&obstack); |
| old_chain = make_cleanup_obstack_free (&obstack); |
| |
| for (child_die = die->child; |
| child_die != NULL && child_die->tag; |
| child_die = sibling_die (child_die)) |
| { |
| struct attribute *attr; |
| LONGEST value; |
| const gdb_byte *bytes; |
| struct dwarf2_locexpr_baton *baton; |
| const char *name; |
| |
| if (child_die->tag != DW_TAG_enumerator) |
| continue; |
| |
| attr = dwarf2_attr (child_die, DW_AT_const_value, cu); |
| if (attr == NULL) |
| continue; |
| |
| name = dwarf2_name (child_die, cu); |
| if (name == NULL) |
| name = "<anonymous enumerator>"; |
| |
| dwarf2_const_value_attr (attr, type, name, &obstack, cu, |
| &value, &bytes, &baton); |
| if (value < 0) |
| { |
| unsigned_enum = 0; |
| flag_enum = 0; |
| } |
| else if ((mask & value) != 0) |
| flag_enum = 0; |
| else |
| mask |= value; |
| |
| /* If we already know that the enum type is neither unsigned, nor |
| a flag type, no need to look at the rest of the enumerates. */ |
| if (!unsigned_enum && !flag_enum) |
| break; |
| } |
| |
| if (unsigned_enum) |
| TYPE_UNSIGNED (type) = 1; |
| if (flag_enum) |
| TYPE_FLAG_ENUM (type) = 1; |
| |
| do_cleanups (old_chain); |
| } |
| |
| /* Given a DW_AT_enumeration_type die, set its type. We do not |
| complete the type's fields yet, or create any symbols. */ |
| |
| static struct type * |
| read_enumeration_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct type *type; |
| struct attribute *attr; |
| const char *name; |
| |
| /* If the definition of this type lives in .debug_types, read that type. |
| Don't follow DW_AT_specification though, that will take us back up |
| the chain and we want to go down. */ |
| attr = dwarf2_attr_no_follow (die, DW_AT_signature); |
| if (attr) |
| { |
| type = get_DW_AT_signature_type (die, attr, cu); |
| |
| /* The type's CU may not be the same as CU. |
| Ensure TYPE is recorded with CU in die_type_hash. */ |
| return set_die_type (die, type, cu); |
| } |
| |
| type = alloc_type (objfile); |
| |
| TYPE_CODE (type) = TYPE_CODE_ENUM; |
| name = dwarf2_full_name (NULL, die, cu); |
| if (name != NULL) |
| TYPE_TAG_NAME (type) = name; |
| |
| attr = dwarf2_attr (die, DW_AT_type, cu); |
| if (attr != NULL) |
| { |
| struct type *underlying_type = die_type (die, cu); |
| |
| TYPE_TARGET_TYPE (type) = underlying_type; |
| } |
| |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| TYPE_LENGTH (type) = DW_UNSND (attr); |
| } |
| else |
| { |
| TYPE_LENGTH (type) = 0; |
| } |
| |
| /* The enumeration DIE can be incomplete. In Ada, any type can be |
| declared as private in the package spec, and then defined only |
| inside the package body. Such types are known as Taft Amendment |
| Types. When another package uses such a type, an incomplete DIE |
| may be generated by the compiler. */ |
| if (die_is_declaration (die, cu)) |
| TYPE_STUB (type) = 1; |
| |
| /* Finish the creation of this type by using the enum's children. |
| We must call this even when the underlying type has been provided |
| so that we can determine if we're looking at a "flag" enum. */ |
| update_enumeration_type_from_children (die, type, cu); |
| |
| /* If this type has an underlying type that is not a stub, then we |
| may use its attributes. We always use the "unsigned" attribute |
| in this situation, because ordinarily we guess whether the type |
| is unsigned -- but the guess can be wrong and the underlying type |
| can tell us the reality. However, we defer to a local size |
| attribute if one exists, because this lets the compiler override |
| the underlying type if needed. */ |
| if (TYPE_TARGET_TYPE (type) != NULL && !TYPE_STUB (TYPE_TARGET_TYPE (type))) |
| { |
| TYPE_UNSIGNED (type) = TYPE_UNSIGNED (TYPE_TARGET_TYPE (type)); |
| if (TYPE_LENGTH (type) == 0) |
| TYPE_LENGTH (type) = TYPE_LENGTH (TYPE_TARGET_TYPE (type)); |
| } |
| |
| TYPE_DECLARED_CLASS (type) = dwarf2_flag_true_p (die, DW_AT_enum_class, cu); |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Given a pointer to a die which begins an enumeration, process all |
| the dies that define the members of the enumeration, and create the |
| symbol for the enumeration type. |
| |
| NOTE: We reverse the order of the element list. */ |
| |
| static void |
| process_enumeration_scope (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *this_type; |
| |
| this_type = get_die_type (die, cu); |
| if (this_type == NULL) |
| this_type = read_enumeration_type (die, cu); |
| |
| if (die->child != NULL) |
| { |
| struct die_info *child_die; |
| struct symbol *sym; |
| struct field *fields = NULL; |
| int num_fields = 0; |
| const char *name; |
| |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag != DW_TAG_enumerator) |
| { |
| process_die (child_die, cu); |
| } |
| else |
| { |
| name = dwarf2_name (child_die, cu); |
| if (name) |
| { |
| sym = new_symbol (child_die, this_type, cu); |
| |
| if ((num_fields % DW_FIELD_ALLOC_CHUNK) == 0) |
| { |
| fields = (struct field *) |
| xrealloc (fields, |
| (num_fields + DW_FIELD_ALLOC_CHUNK) |
| * sizeof (struct field)); |
| } |
| |
| FIELD_NAME (fields[num_fields]) = SYMBOL_LINKAGE_NAME (sym); |
| FIELD_TYPE (fields[num_fields]) = NULL; |
| SET_FIELD_ENUMVAL (fields[num_fields], SYMBOL_VALUE (sym)); |
| FIELD_BITSIZE (fields[num_fields]) = 0; |
| |
| num_fields++; |
| } |
| } |
| |
| child_die = sibling_die (child_die); |
| } |
| |
| if (num_fields) |
| { |
| TYPE_NFIELDS (this_type) = num_fields; |
| TYPE_FIELDS (this_type) = (struct field *) |
| TYPE_ALLOC (this_type, sizeof (struct field) * num_fields); |
| memcpy (TYPE_FIELDS (this_type), fields, |
| sizeof (struct field) * num_fields); |
| xfree (fields); |
| } |
| } |
| |
| /* If we are reading an enum from a .debug_types unit, and the enum |
| is a declaration, and the enum is not the signatured type in the |
| unit, then we do not want to add a symbol for it. Adding a |
| symbol would in some cases obscure the true definition of the |
| enum, giving users an incomplete type when the definition is |
| actually available. Note that we do not want to do this for all |
| enums which are just declarations, because C++0x allows forward |
| enum declarations. */ |
| if (cu->per_cu->is_debug_types |
| && die_is_declaration (die, cu)) |
| { |
| struct signatured_type *sig_type; |
| |
| sig_type = (struct signatured_type *) cu->per_cu; |
| gdb_assert (sig_type->type_offset_in_section.sect_off != 0); |
| if (sig_type->type_offset_in_section.sect_off != die->offset.sect_off) |
| return; |
| } |
| |
| new_symbol (die, this_type, cu); |
| } |
| |
| /* Extract all information from a DW_TAG_array_type DIE and put it in |
| the DIE's type field. For now, this only handles one dimensional |
| arrays. */ |
| |
| static struct type * |
| read_array_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct die_info *child_die; |
| struct type *type; |
| struct type *element_type, *range_type, *index_type; |
| struct type **range_types = NULL; |
| struct attribute *attr; |
| int ndim = 0; |
| struct cleanup *back_to; |
| const char *name; |
| unsigned int bit_stride = 0; |
| |
| element_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| type = get_die_type (die, cu); |
| if (type) |
| return type; |
| |
| attr = dwarf2_attr (die, DW_AT_byte_stride, cu); |
| if (attr != NULL) |
| bit_stride = DW_UNSND (attr) * 8; |
| |
| attr = dwarf2_attr (die, DW_AT_bit_stride, cu); |
| if (attr != NULL) |
| bit_stride = DW_UNSND (attr); |
| |
| /* Irix 6.2 native cc creates array types without children for |
| arrays with unspecified length. */ |
| if (die->child == NULL) |
| { |
| index_type = objfile_type (objfile)->builtin_int; |
| range_type = create_static_range_type (NULL, index_type, 0, -1); |
| type = create_array_type_with_stride (NULL, element_type, range_type, |
| bit_stride); |
| return set_die_type (die, type, cu); |
| } |
| |
| back_to = make_cleanup (null_cleanup, NULL); |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_subrange_type) |
| { |
| struct type *child_type = read_type_die (child_die, cu); |
| |
| if (child_type != NULL) |
| { |
| /* The range type was succesfully read. Save it for the |
| array type creation. */ |
| if ((ndim % DW_FIELD_ALLOC_CHUNK) == 0) |
| { |
| range_types = (struct type **) |
| xrealloc (range_types, (ndim + DW_FIELD_ALLOC_CHUNK) |
| * sizeof (struct type *)); |
| if (ndim == 0) |
| make_cleanup (free_current_contents, &range_types); |
| } |
| range_types[ndim++] = child_type; |
| } |
| } |
| child_die = sibling_die (child_die); |
| } |
| |
| /* Dwarf2 dimensions are output from left to right, create the |
| necessary array types in backwards order. */ |
| |
| type = element_type; |
| |
| if (read_array_order (die, cu) == DW_ORD_col_major) |
| { |
| int i = 0; |
| |
| while (i < ndim) |
| type = create_array_type_with_stride (NULL, type, range_types[i++], |
| bit_stride); |
| } |
| else |
| { |
| while (ndim-- > 0) |
| type = create_array_type_with_stride (NULL, type, range_types[ndim], |
| bit_stride); |
| } |
| |
| /* Understand Dwarf2 support for vector types (like they occur on |
| the PowerPC w/ AltiVec). Gcc just adds another attribute to the |
| array type. This is not part of the Dwarf2/3 standard yet, but a |
| custom vendor extension. The main difference between a regular |
| array and the vector variant is that vectors are passed by value |
| to functions. */ |
| attr = dwarf2_attr (die, DW_AT_GNU_vector, cu); |
| if (attr) |
| make_vector_type (type); |
| |
| /* The DIE may have DW_AT_byte_size set. For example an OpenCL |
| implementation may choose to implement triple vectors using this |
| attribute. */ |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| if (DW_UNSND (attr) >= TYPE_LENGTH (type)) |
| TYPE_LENGTH (type) = DW_UNSND (attr); |
| else |
| complaint (&symfile_complaints, |
| _("DW_AT_byte_size for array type smaller " |
| "than the total size of elements")); |
| } |
| |
| name = dwarf2_name (die, cu); |
| if (name) |
| TYPE_NAME (type) = name; |
| |
| /* Install the type in the die. */ |
| set_die_type (die, type, cu); |
| |
| /* set_die_type should be already done. */ |
| set_descriptive_type (type, die, cu); |
| |
| do_cleanups (back_to); |
| |
| return type; |
| } |
| |
| static enum dwarf_array_dim_ordering |
| read_array_order (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_ordering, cu); |
| |
| if (attr) |
| return (enum dwarf_array_dim_ordering) DW_SND (attr); |
| |
| /* GNU F77 is a special case, as at 08/2004 array type info is the |
| opposite order to the dwarf2 specification, but data is still |
| laid out as per normal fortran. |
| |
| FIXME: dsl/2004-8-20: If G77 is ever fixed, this will also need |
| version checking. */ |
| |
| if (cu->language == language_fortran |
| && cu->producer && strstr (cu->producer, "GNU F77")) |
| { |
| return DW_ORD_row_major; |
| } |
| |
| switch (cu->language_defn->la_array_ordering) |
| { |
| case array_column_major: |
| return DW_ORD_col_major; |
| case array_row_major: |
| default: |
| return DW_ORD_row_major; |
| }; |
| } |
| |
| /* Extract all information from a DW_TAG_set_type DIE and put it in |
| the DIE's type field. */ |
| |
| static struct type * |
| read_set_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *domain_type, *set_type; |
| struct attribute *attr; |
| |
| domain_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| set_type = get_die_type (die, cu); |
| if (set_type) |
| return set_type; |
| |
| set_type = create_set_type (NULL, domain_type); |
| |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| TYPE_LENGTH (set_type) = DW_UNSND (attr); |
| |
| return set_die_type (die, set_type, cu); |
| } |
| |
| /* A helper for read_common_block that creates a locexpr baton. |
| SYM is the symbol which we are marking as computed. |
| COMMON_DIE is the DIE for the common block. |
| COMMON_LOC is the location expression attribute for the common |
| block itself. |
| MEMBER_LOC is the location expression attribute for the particular |
| member of the common block that we are processing. |
| CU is the CU from which the above come. */ |
| |
| static void |
| mark_common_block_symbol_computed (struct symbol *sym, |
| struct die_info *common_die, |
| struct attribute *common_loc, |
| struct attribute *member_loc, |
| struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_locexpr_baton *baton; |
| gdb_byte *ptr; |
| unsigned int cu_off; |
| enum bfd_endian byte_order = gdbarch_byte_order (get_objfile_arch (objfile)); |
| LONGEST offset = 0; |
| |
| gdb_assert (common_loc && member_loc); |
| gdb_assert (attr_form_is_block (common_loc)); |
| gdb_assert (attr_form_is_block (member_loc) |
| || attr_form_is_constant (member_loc)); |
| |
| baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); |
| baton->per_cu = cu->per_cu; |
| gdb_assert (baton->per_cu); |
| |
| baton->size = 5 /* DW_OP_call4 */ + 1 /* DW_OP_plus */; |
| |
| if (attr_form_is_constant (member_loc)) |
| { |
| offset = dwarf2_get_attr_constant_value (member_loc, 0); |
| baton->size += 1 /* DW_OP_addr */ + cu->header.addr_size; |
| } |
| else |
| baton->size += DW_BLOCK (member_loc)->size; |
| |
| ptr = (gdb_byte *) obstack_alloc (&objfile->objfile_obstack, baton->size); |
| baton->data = ptr; |
| |
| *ptr++ = DW_OP_call4; |
| cu_off = common_die->offset.sect_off - cu->per_cu->offset.sect_off; |
| store_unsigned_integer (ptr, 4, byte_order, cu_off); |
| ptr += 4; |
| |
| if (attr_form_is_constant (member_loc)) |
| { |
| *ptr++ = DW_OP_addr; |
| store_unsigned_integer (ptr, cu->header.addr_size, byte_order, offset); |
| ptr += cu->header.addr_size; |
| } |
| else |
| { |
| /* We have to copy the data here, because DW_OP_call4 will only |
| use a DW_AT_location attribute. */ |
| memcpy (ptr, DW_BLOCK (member_loc)->data, DW_BLOCK (member_loc)->size); |
| ptr += DW_BLOCK (member_loc)->size; |
| } |
| |
| *ptr++ = DW_OP_plus; |
| gdb_assert (ptr - baton->data == baton->size); |
| |
| SYMBOL_LOCATION_BATON (sym) = baton; |
| SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index; |
| } |
| |
| /* Create appropriate locally-scoped variables for all the |
| DW_TAG_common_block entries. Also create a struct common_block |
| listing all such variables for `info common'. COMMON_BLOCK_DOMAIN |
| is used to sepate the common blocks name namespace from regular |
| variable names. */ |
| |
| static void |
| read_common_block (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_location, cu); |
| if (attr) |
| { |
| /* Support the .debug_loc offsets. */ |
| if (attr_form_is_block (attr)) |
| { |
| /* Ok. */ |
| } |
| else if (attr_form_is_section_offset (attr)) |
| { |
| dwarf2_complex_location_expr_complaint (); |
| attr = NULL; |
| } |
| else |
| { |
| dwarf2_invalid_attrib_class_complaint ("DW_AT_location", |
| "common block member"); |
| attr = NULL; |
| } |
| } |
| |
| if (die->child != NULL) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct die_info *child_die; |
| size_t n_entries = 0, size; |
| struct common_block *common_block; |
| struct symbol *sym; |
| |
| for (child_die = die->child; |
| child_die && child_die->tag; |
| child_die = sibling_die (child_die)) |
| ++n_entries; |
| |
| size = (sizeof (struct common_block) |
| + (n_entries - 1) * sizeof (struct symbol *)); |
| common_block |
| = (struct common_block *) obstack_alloc (&objfile->objfile_obstack, |
| size); |
| memset (common_block->contents, 0, n_entries * sizeof (struct symbol *)); |
| common_block->n_entries = 0; |
| |
| for (child_die = die->child; |
| child_die && child_die->tag; |
| child_die = sibling_die (child_die)) |
| { |
| /* Create the symbol in the DW_TAG_common_block block in the current |
| symbol scope. */ |
| sym = new_symbol (child_die, NULL, cu); |
| if (sym != NULL) |
| { |
| struct attribute *member_loc; |
| |
| common_block->contents[common_block->n_entries++] = sym; |
| |
| member_loc = dwarf2_attr (child_die, DW_AT_data_member_location, |
| cu); |
| if (member_loc) |
| { |
| /* GDB has handled this for a long time, but it is |
| not specified by DWARF. It seems to have been |
| emitted by gfortran at least as recently as: |
| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23057. */ |
| complaint (&symfile_complaints, |
| _("Variable in common block has " |
| "DW_AT_data_member_location " |
| "- DIE at 0x%x [in module %s]"), |
| child_die->offset.sect_off, |
| objfile_name (cu->objfile)); |
| |
| if (attr_form_is_section_offset (member_loc)) |
| dwarf2_complex_location_expr_complaint (); |
| else if (attr_form_is_constant (member_loc) |
| || attr_form_is_block (member_loc)) |
| { |
| if (attr) |
| mark_common_block_symbol_computed (sym, die, attr, |
| member_loc, cu); |
| } |
| else |
| dwarf2_complex_location_expr_complaint (); |
| } |
| } |
| } |
| |
| sym = new_symbol (die, objfile_type (objfile)->builtin_void, cu); |
| SYMBOL_VALUE_COMMON_BLOCK (sym) = common_block; |
| } |
| } |
| |
| /* Create a type for a C++ namespace. */ |
| |
| static struct type * |
| read_namespace_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| const char *previous_prefix, *name; |
| int is_anonymous; |
| struct type *type; |
| |
| /* For extensions, reuse the type of the original namespace. */ |
| if (dwarf2_attr (die, DW_AT_extension, cu) != NULL) |
| { |
| struct die_info *ext_die; |
| struct dwarf2_cu *ext_cu = cu; |
| |
| ext_die = dwarf2_extension (die, &ext_cu); |
| type = read_type_die (ext_die, ext_cu); |
| |
| /* EXT_CU may not be the same as CU. |
| Ensure TYPE is recorded with CU in die_type_hash. */ |
| return set_die_type (die, type, cu); |
| } |
| |
| name = namespace_name (die, &is_anonymous, cu); |
| |
| /* Now build the name of the current namespace. */ |
| |
| previous_prefix = determine_prefix (die, cu); |
| if (previous_prefix[0] != '\0') |
| name = typename_concat (&objfile->objfile_obstack, |
| previous_prefix, name, 0, cu); |
| |
| /* Create the type. */ |
| type = init_type (objfile, TYPE_CODE_NAMESPACE, 0, name); |
| TYPE_TAG_NAME (type) = TYPE_NAME (type); |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Read a namespace scope. */ |
| |
| static void |
| read_namespace (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| int is_anonymous; |
| |
| /* Add a symbol associated to this if we haven't seen the namespace |
| before. Also, add a using directive if it's an anonymous |
| namespace. */ |
| |
| if (dwarf2_attr (die, DW_AT_extension, cu) == NULL) |
| { |
| struct type *type; |
| |
| type = read_type_die (die, cu); |
| new_symbol (die, type, cu); |
| |
| namespace_name (die, &is_anonymous, cu); |
| if (is_anonymous) |
| { |
| const char *previous_prefix = determine_prefix (die, cu); |
| |
| add_using_directive (using_directives (cu->language), |
| previous_prefix, TYPE_NAME (type), NULL, |
| NULL, NULL, 0, &objfile->objfile_obstack); |
| } |
| } |
| |
| if (die->child != NULL) |
| { |
| struct die_info *child_die = die->child; |
| |
| while (child_die && child_die->tag) |
| { |
| process_die (child_die, cu); |
| child_die = sibling_die (child_die); |
| } |
| } |
| } |
| |
| /* Read a Fortran module as type. This DIE can be only a declaration used for |
| imported module. Still we need that type as local Fortran "use ... only" |
| declaration imports depend on the created type in determine_prefix. */ |
| |
| static struct type * |
| read_module_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| const char *module_name; |
| struct type *type; |
| |
| module_name = dwarf2_name (die, cu); |
| if (!module_name) |
| complaint (&symfile_complaints, |
| _("DW_TAG_module has no name, offset 0x%x"), |
| die->offset.sect_off); |
| type = init_type (objfile, TYPE_CODE_MODULE, 0, module_name); |
| |
| /* determine_prefix uses TYPE_TAG_NAME. */ |
| TYPE_TAG_NAME (type) = TYPE_NAME (type); |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Read a Fortran module. */ |
| |
| static void |
| read_module (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct die_info *child_die = die->child; |
| struct type *type; |
| |
| type = read_type_die (die, cu); |
| new_symbol (die, type, cu); |
| |
| while (child_die && child_die->tag) |
| { |
| process_die (child_die, cu); |
| child_die = sibling_die (child_die); |
| } |
| } |
| |
| /* Return the name of the namespace represented by DIE. Set |
| *IS_ANONYMOUS to tell whether or not the namespace is an anonymous |
| namespace. */ |
| |
| static const char * |
| namespace_name (struct die_info *die, int *is_anonymous, struct dwarf2_cu *cu) |
| { |
| struct die_info *current_die; |
| const char *name = NULL; |
| |
| /* Loop through the extensions until we find a name. */ |
| |
| for (current_die = die; |
| current_die != NULL; |
| current_die = dwarf2_extension (die, &cu)) |
| { |
| /* We don't use dwarf2_name here so that we can detect the absence |
| of a name -> anonymous namespace. */ |
| name = dwarf2_string_attr (die, DW_AT_name, cu); |
| |
| if (name != NULL) |
| break; |
| } |
| |
| /* Is it an anonymous namespace? */ |
| |
| *is_anonymous = (name == NULL); |
| if (*is_anonymous) |
| name = CP_ANONYMOUS_NAMESPACE_STR; |
| |
| return name; |
| } |
| |
| /* Extract all information from a DW_TAG_pointer_type DIE and add to |
| the user defined type vector. */ |
| |
| static struct type * |
| read_tag_pointer_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct gdbarch *gdbarch = get_objfile_arch (cu->objfile); |
| struct comp_unit_head *cu_header = &cu->header; |
| struct type *type; |
| struct attribute *attr_byte_size; |
| struct attribute *attr_address_class; |
| int byte_size, addr_class; |
| struct type *target_type; |
| |
| target_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| type = get_die_type (die, cu); |
| if (type) |
| return type; |
| |
| type = lookup_pointer_type (target_type); |
| |
| attr_byte_size = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr_byte_size) |
| byte_size = DW_UNSND (attr_byte_size); |
| else |
| byte_size = cu_header->addr_size; |
| |
| attr_address_class = dwarf2_attr (die, DW_AT_address_class, cu); |
| if (attr_address_class) |
| addr_class = DW_UNSND (attr_address_class); |
| else |
| addr_class = DW_ADDR_none; |
| |
| /* If the pointer size or address class is different than the |
| default, create a type variant marked as such and set the |
| length accordingly. */ |
| if (TYPE_LENGTH (type) != byte_size || addr_class != DW_ADDR_none) |
| { |
| if (gdbarch_address_class_type_flags_p (gdbarch)) |
| { |
| int type_flags; |
| |
| type_flags = gdbarch_address_class_type_flags |
| (gdbarch, byte_size, addr_class); |
| gdb_assert ((type_flags & ~TYPE_INSTANCE_FLAG_ADDRESS_CLASS_ALL) |
| == 0); |
| type = make_type_with_address_space (type, type_flags); |
| } |
| else if (TYPE_LENGTH (type) != byte_size) |
| { |
| complaint (&symfile_complaints, |
| _("invalid pointer size %d"), byte_size); |
| } |
| else |
| { |
| /* Should we also complain about unhandled address classes? */ |
| } |
| } |
| |
| TYPE_LENGTH (type) = byte_size; |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Extract all information from a DW_TAG_ptr_to_member_type DIE and add to |
| the user defined type vector. */ |
| |
| static struct type * |
| read_tag_ptr_to_member_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *type; |
| struct type *to_type; |
| struct type *domain; |
| |
| to_type = die_type (die, cu); |
| domain = die_containing_type (die, cu); |
| |
| /* The calls above may have already set the type for this DIE. */ |
| type = get_die_type (die, cu); |
| if (type) |
| return type; |
| |
| if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_METHOD) |
| type = lookup_methodptr_type (to_type); |
| else if (TYPE_CODE (check_typedef (to_type)) == TYPE_CODE_FUNC) |
| { |
| struct type *new_type = alloc_type (cu->objfile); |
| |
| smash_to_method_type (new_type, domain, TYPE_TARGET_TYPE (to_type), |
| TYPE_FIELDS (to_type), TYPE_NFIELDS (to_type), |
| TYPE_VARARGS (to_type)); |
| type = lookup_methodptr_type (new_type); |
| } |
| else |
| type = lookup_memberptr_type (to_type, domain); |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Extract all information from a DW_TAG_reference_type DIE and add to |
| the user defined type vector. */ |
| |
| static struct type * |
| read_tag_reference_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct comp_unit_head *cu_header = &cu->header; |
| struct type *type, *target_type; |
| struct attribute *attr; |
| |
| target_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| type = get_die_type (die, cu); |
| if (type) |
| return type; |
| |
| type = lookup_reference_type (target_type); |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| TYPE_LENGTH (type) = DW_UNSND (attr); |
| } |
| else |
| { |
| TYPE_LENGTH (type) = cu_header->addr_size; |
| } |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Add the given cv-qualifiers to the element type of the array. GCC |
| outputs DWARF type qualifiers that apply to an array, not the |
| element type. But GDB relies on the array element type to carry |
| the cv-qualifiers. This mimics section 6.7.3 of the C99 |
| specification. */ |
| |
| static struct type * |
| add_array_cv_type (struct die_info *die, struct dwarf2_cu *cu, |
| struct type *base_type, int cnst, int voltl) |
| { |
| struct type *el_type, *inner_array; |
| |
| base_type = copy_type (base_type); |
| inner_array = base_type; |
| |
| while (TYPE_CODE (TYPE_TARGET_TYPE (inner_array)) == TYPE_CODE_ARRAY) |
| { |
| TYPE_TARGET_TYPE (inner_array) = |
| copy_type (TYPE_TARGET_TYPE (inner_array)); |
| inner_array = TYPE_TARGET_TYPE (inner_array); |
| } |
| |
| el_type = TYPE_TARGET_TYPE (inner_array); |
| cnst |= TYPE_CONST (el_type); |
| voltl |= TYPE_VOLATILE (el_type); |
| TYPE_TARGET_TYPE (inner_array) = make_cv_type (cnst, voltl, el_type, NULL); |
| |
| return set_die_type (die, base_type, cu); |
| } |
| |
| static struct type * |
| read_tag_const_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *base_type, *cv_type; |
| |
| base_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| cv_type = get_die_type (die, cu); |
| if (cv_type) |
| return cv_type; |
| |
| /* In case the const qualifier is applied to an array type, the element type |
| is so qualified, not the array type (section 6.7.3 of C99). */ |
| if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY) |
| return add_array_cv_type (die, cu, base_type, 1, 0); |
| |
| cv_type = make_cv_type (1, TYPE_VOLATILE (base_type), base_type, 0); |
| return set_die_type (die, cv_type, cu); |
| } |
| |
| static struct type * |
| read_tag_volatile_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *base_type, *cv_type; |
| |
| base_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| cv_type = get_die_type (die, cu); |
| if (cv_type) |
| return cv_type; |
| |
| /* In case the volatile qualifier is applied to an array type, the |
| element type is so qualified, not the array type (section 6.7.3 |
| of C99). */ |
| if (TYPE_CODE (base_type) == TYPE_CODE_ARRAY) |
| return add_array_cv_type (die, cu, base_type, 0, 1); |
| |
| cv_type = make_cv_type (TYPE_CONST (base_type), 1, base_type, 0); |
| return set_die_type (die, cv_type, cu); |
| } |
| |
| /* Handle DW_TAG_restrict_type. */ |
| |
| static struct type * |
| read_tag_restrict_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *base_type, *cv_type; |
| |
| base_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| cv_type = get_die_type (die, cu); |
| if (cv_type) |
| return cv_type; |
| |
| cv_type = make_restrict_type (base_type); |
| return set_die_type (die, cv_type, cu); |
| } |
| |
| /* Handle DW_TAG_atomic_type. */ |
| |
| static struct type * |
| read_tag_atomic_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *base_type, *cv_type; |
| |
| base_type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| cv_type = get_die_type (die, cu); |
| if (cv_type) |
| return cv_type; |
| |
| cv_type = make_atomic_type (base_type); |
| return set_die_type (die, cv_type, cu); |
| } |
| |
| /* Extract all information from a DW_TAG_string_type DIE and add to |
| the user defined type vector. It isn't really a user defined type, |
| but it behaves like one, with other DIE's using an AT_user_def_type |
| attribute to reference it. */ |
| |
| static struct type * |
| read_tag_string_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct type *type, *range_type, *index_type, *char_type; |
| struct attribute *attr; |
| unsigned int length; |
| |
| attr = dwarf2_attr (die, DW_AT_string_length, cu); |
| if (attr) |
| { |
| length = DW_UNSND (attr); |
| } |
| else |
| { |
| /* Check for the DW_AT_byte_size attribute. */ |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| length = DW_UNSND (attr); |
| } |
| else |
| { |
| length = 1; |
| } |
| } |
| |
| index_type = objfile_type (objfile)->builtin_int; |
| range_type = create_static_range_type (NULL, index_type, 1, length); |
| char_type = language_string_char_type (cu->language_defn, gdbarch); |
| type = create_string_type (NULL, char_type, range_type); |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Assuming that DIE corresponds to a function, returns nonzero |
| if the function is prototyped. */ |
| |
| static int |
| prototyped_function_p (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_prototyped, cu); |
| if (attr && (DW_UNSND (attr) != 0)) |
| return 1; |
| |
| /* The DWARF standard implies that the DW_AT_prototyped attribute |
| is only meaninful for C, but the concept also extends to other |
| languages that allow unprototyped functions (Eg: Objective C). |
| For all other languages, assume that functions are always |
| prototyped. */ |
| if (cu->language != language_c |
| && cu->language != language_objc |
| && cu->language != language_opencl) |
| return 1; |
| |
| /* RealView does not emit DW_AT_prototyped. We can not distinguish |
| prototyped and unprototyped functions; default to prototyped, |
| since that is more common in modern code (and RealView warns |
| about unprototyped functions). */ |
| if (producer_is_realview (cu->producer)) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* Handle DIES due to C code like: |
| |
| struct foo |
| { |
| int (*funcp)(int a, long l); |
| int b; |
| }; |
| |
| ('funcp' generates a DW_TAG_subroutine_type DIE). */ |
| |
| static struct type * |
| read_subroutine_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct type *type; /* Type that this function returns. */ |
| struct type *ftype; /* Function that returns above type. */ |
| struct attribute *attr; |
| |
| type = die_type (die, cu); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| ftype = get_die_type (die, cu); |
| if (ftype) |
| return ftype; |
| |
| ftype = lookup_function_type (type); |
| |
| if (prototyped_function_p (die, cu)) |
| TYPE_PROTOTYPED (ftype) = 1; |
| |
| /* Store the calling convention in the type if it's available in |
| the subroutine die. Otherwise set the calling convention to |
| the default value DW_CC_normal. */ |
| attr = dwarf2_attr (die, DW_AT_calling_convention, cu); |
| if (attr) |
| TYPE_CALLING_CONVENTION (ftype) = DW_UNSND (attr); |
| else if (cu->producer && strstr (cu->producer, "IBM XL C for OpenCL")) |
| TYPE_CALLING_CONVENTION (ftype) = DW_CC_GDB_IBM_OpenCL; |
| else |
| TYPE_CALLING_CONVENTION (ftype) = DW_CC_normal; |
| |
| /* Record whether the function returns normally to its caller or not |
| if the DWARF producer set that information. */ |
| attr = dwarf2_attr (die, DW_AT_noreturn, cu); |
| if (attr && (DW_UNSND (attr) != 0)) |
| TYPE_NO_RETURN (ftype) = 1; |
| |
| /* We need to add the subroutine type to the die immediately so |
| we don't infinitely recurse when dealing with parameters |
| declared as the same subroutine type. */ |
| set_die_type (die, ftype, cu); |
| |
| if (die->child != NULL) |
| { |
| struct type *void_type = objfile_type (objfile)->builtin_void; |
| struct die_info *child_die; |
| int nparams, iparams; |
| |
| /* Count the number of parameters. |
| FIXME: GDB currently ignores vararg functions, but knows about |
| vararg member functions. */ |
| nparams = 0; |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_formal_parameter) |
| nparams++; |
| else if (child_die->tag == DW_TAG_unspecified_parameters) |
| TYPE_VARARGS (ftype) = 1; |
| child_die = sibling_die (child_die); |
| } |
| |
| /* Allocate storage for parameters and fill them in. */ |
| TYPE_NFIELDS (ftype) = nparams; |
| TYPE_FIELDS (ftype) = (struct field *) |
| TYPE_ZALLOC (ftype, nparams * sizeof (struct field)); |
| |
| /* TYPE_FIELD_TYPE must never be NULL. Pre-fill the array to ensure it |
| even if we error out during the parameters reading below. */ |
| for (iparams = 0; iparams < nparams; iparams++) |
| TYPE_FIELD_TYPE (ftype, iparams) = void_type; |
| |
| iparams = 0; |
| child_die = die->child; |
| while (child_die && child_die->tag) |
| { |
| if (child_die->tag == DW_TAG_formal_parameter) |
| { |
| struct type *arg_type; |
| |
| /* DWARF version 2 has no clean way to discern C++ |
| static and non-static member functions. G++ helps |
| GDB by marking the first parameter for non-static |
| member functions (which is the this pointer) as |
| artificial. We pass this information to |
| dwarf2_add_member_fn via TYPE_FIELD_ARTIFICIAL. |
| |
| DWARF version 3 added DW_AT_object_pointer, which GCC |
| 4.5 does not yet generate. */ |
| attr = dwarf2_attr (child_die, DW_AT_artificial, cu); |
| if (attr) |
| TYPE_FIELD_ARTIFICIAL (ftype, iparams) = DW_UNSND (attr); |
| else |
| TYPE_FIELD_ARTIFICIAL (ftype, iparams) = 0; |
| arg_type = die_type (child_die, cu); |
| |
| /* RealView does not mark THIS as const, which the testsuite |
| expects. GCC marks THIS as const in method definitions, |
| but not in the class specifications (GCC PR 43053). */ |
| if (cu->language == language_cplus && !TYPE_CONST (arg_type) |
| && TYPE_FIELD_ARTIFICIAL (ftype, iparams)) |
| { |
| int is_this = 0; |
| struct dwarf2_cu *arg_cu = cu; |
| const char *name = dwarf2_name (child_die, cu); |
| |
| attr = dwarf2_attr (die, DW_AT_object_pointer, cu); |
| if (attr) |
| { |
| /* If the compiler emits this, use it. */ |
| if (follow_die_ref (die, attr, &arg_cu) == child_die) |
| is_this = 1; |
| } |
| else if (name && strcmp (name, "this") == 0) |
| /* Function definitions will have the argument names. */ |
| is_this = 1; |
| else if (name == NULL && iparams == 0) |
| /* Declarations may not have the names, so like |
| elsewhere in GDB, assume an artificial first |
| argument is "this". */ |
| is_this = 1; |
| |
| if (is_this) |
| arg_type = make_cv_type (1, TYPE_VOLATILE (arg_type), |
| arg_type, 0); |
| } |
| |
| TYPE_FIELD_TYPE (ftype, iparams) = arg_type; |
| iparams++; |
| } |
| child_die = sibling_die (child_die); |
| } |
| } |
| |
| return ftype; |
| } |
| |
| static struct type * |
| read_typedef (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| const char *name = NULL; |
| struct type *this_type, *target_type; |
| |
| name = dwarf2_full_name (NULL, die, cu); |
| this_type = init_type (objfile, TYPE_CODE_TYPEDEF, 0, name); |
| TYPE_TARGET_STUB (this_type) = 1; |
| set_die_type (die, this_type, cu); |
| target_type = die_type (die, cu); |
| if (target_type != this_type) |
| TYPE_TARGET_TYPE (this_type) = target_type; |
| else |
| { |
| /* Self-referential typedefs are, it seems, not allowed by the DWARF |
| spec and cause infinite loops in GDB. */ |
| complaint (&symfile_complaints, |
| _("Self-referential DW_TAG_typedef " |
| "- DIE at 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (objfile)); |
| TYPE_TARGET_TYPE (this_type) = NULL; |
| } |
| return this_type; |
| } |
| |
| /* Allocate a floating-point type of size BITS and name NAME. Pass NAME_HINT |
| (which may be different from NAME) to the architecture back-end to allow |
| it to guess the correct format if necessary. */ |
| |
| static struct type * |
| dwarf2_init_float_type (struct objfile *objfile, int bits, const char *name, |
| const char *name_hint) |
| { |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| const struct floatformat **format; |
| struct type *type; |
| |
| format = gdbarch_floatformat_for_type (gdbarch, name_hint, bits); |
| if (format) |
| type = init_float_type (objfile, bits, name, format); |
| else |
| type = init_type (objfile, TYPE_CODE_ERROR, bits / TARGET_CHAR_BIT, name); |
| |
| return type; |
| } |
| |
| /* Find a representation of a given base type and install |
| it in the TYPE field of the die. */ |
| |
| static struct type * |
| read_base_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct type *type; |
| struct attribute *attr; |
| int encoding = 0, bits = 0; |
| const char *name; |
| |
| attr = dwarf2_attr (die, DW_AT_encoding, cu); |
| if (attr) |
| { |
| encoding = DW_UNSND (attr); |
| } |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| { |
| bits = DW_UNSND (attr) * TARGET_CHAR_BIT; |
| } |
| name = dwarf2_name (die, cu); |
| if (!name) |
| { |
| complaint (&symfile_complaints, |
| _("DW_AT_name missing from DW_TAG_base_type")); |
| } |
| |
| switch (encoding) |
| { |
| case DW_ATE_address: |
| /* Turn DW_ATE_address into a void * pointer. */ |
| type = init_type (objfile, TYPE_CODE_VOID, 1, NULL); |
| type = init_pointer_type (objfile, bits, name, type); |
| break; |
| case DW_ATE_boolean: |
| type = init_boolean_type (objfile, bits, 1, name); |
| break; |
| case DW_ATE_complex_float: |
| type = dwarf2_init_float_type (objfile, bits / 2, NULL, name); |
| type = init_complex_type (objfile, name, type); |
| break; |
| case DW_ATE_decimal_float: |
| type = init_decfloat_type (objfile, bits, name); |
| break; |
| case DW_ATE_float: |
| type = dwarf2_init_float_type (objfile, bits, name, name); |
| break; |
| case DW_ATE_signed: |
| type = init_integer_type (objfile, bits, 0, name); |
| break; |
| case DW_ATE_unsigned: |
| if (cu->language == language_fortran |
| && name |
| && startswith (name, "character(")) |
| type = init_character_type (objfile, bits, 1, name); |
| else |
| type = init_integer_type (objfile, bits, 1, name); |
| break; |
| case DW_ATE_signed_char: |
| if (cu->language == language_ada || cu->language == language_m2 |
| || cu->language == language_pascal |
| || cu->language == language_fortran) |
| type = init_character_type (objfile, bits, 0, name); |
| else |
| type = init_integer_type (objfile, bits, 0, name); |
| break; |
| case DW_ATE_unsigned_char: |
| if (cu->language == language_ada || cu->language == language_m2 |
| || cu->language == language_pascal |
| || cu->language == language_fortran |
| || cu->language == language_rust) |
| type = init_character_type (objfile, bits, 1, name); |
| else |
| type = init_integer_type (objfile, bits, 1, name); |
| break; |
| case DW_ATE_UTF: |
| /* We just treat this as an integer and then recognize the |
| type by name elsewhere. */ |
| type = init_integer_type (objfile, bits, 0, name); |
| break; |
| |
| default: |
| complaint (&symfile_complaints, _("unsupported DW_AT_encoding: '%s'"), |
| dwarf_type_encoding_name (encoding)); |
| type = init_type (objfile, TYPE_CODE_ERROR, |
| bits / TARGET_CHAR_BIT, name); |
| break; |
| } |
| |
| if (name && strcmp (name, "char") == 0) |
| TYPE_NOSIGN (type) = 1; |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Parse dwarf attribute if it's a block, reference or constant and put the |
| resulting value of the attribute into struct bound_prop. |
| Returns 1 if ATTR could be resolved into PROP, 0 otherwise. */ |
| |
| static int |
| attr_to_dynamic_prop (const struct attribute *attr, struct die_info *die, |
| struct dwarf2_cu *cu, struct dynamic_prop *prop) |
| { |
| struct dwarf2_property_baton *baton; |
| struct obstack *obstack = &cu->objfile->objfile_obstack; |
| |
| if (attr == NULL || prop == NULL) |
| return 0; |
| |
| if (attr_form_is_block (attr)) |
| { |
| baton = XOBNEW (obstack, struct dwarf2_property_baton); |
| baton->referenced_type = NULL; |
| baton->locexpr.per_cu = cu->per_cu; |
| baton->locexpr.size = DW_BLOCK (attr)->size; |
| baton->locexpr.data = DW_BLOCK (attr)->data; |
| prop->data.baton = baton; |
| prop->kind = PROP_LOCEXPR; |
| gdb_assert (prop->data.baton != NULL); |
| } |
| else if (attr_form_is_ref (attr)) |
| { |
| struct dwarf2_cu *target_cu = cu; |
| struct die_info *target_die; |
| struct attribute *target_attr; |
| |
| target_die = follow_die_ref (die, attr, &target_cu); |
| target_attr = dwarf2_attr (target_die, DW_AT_location, target_cu); |
| if (target_attr == NULL) |
| target_attr = dwarf2_attr (target_die, DW_AT_data_member_location, |
| target_cu); |
| if (target_attr == NULL) |
| return 0; |
| |
| switch (target_attr->name) |
| { |
| case DW_AT_location: |
| if (attr_form_is_section_offset (target_attr)) |
| { |
| baton = XOBNEW (obstack, struct dwarf2_property_baton); |
| baton->referenced_type = die_type (target_die, target_cu); |
| fill_in_loclist_baton (cu, &baton->loclist, target_attr); |
| prop->data.baton = baton; |
| prop->kind = PROP_LOCLIST; |
| gdb_assert (prop->data.baton != NULL); |
| } |
| else if (attr_form_is_block (target_attr)) |
| { |
| baton = XOBNEW (obstack, struct dwarf2_property_baton); |
| baton->referenced_type = die_type (target_die, target_cu); |
| baton->locexpr.per_cu = cu->per_cu; |
| baton->locexpr.size = DW_BLOCK (target_attr)->size; |
| baton->locexpr.data = DW_BLOCK (target_attr)->data; |
| prop->data.baton = baton; |
| prop->kind = PROP_LOCEXPR; |
| gdb_assert (prop->data.baton != NULL); |
| } |
| else |
| { |
| dwarf2_invalid_attrib_class_complaint ("DW_AT_location", |
| "dynamic property"); |
| return 0; |
| } |
| break; |
| case DW_AT_data_member_location: |
| { |
| LONGEST offset; |
| |
| if (!handle_data_member_location (target_die, target_cu, |
| &offset)) |
| return 0; |
| |
| baton = XOBNEW (obstack, struct dwarf2_property_baton); |
| baton->referenced_type = read_type_die (target_die->parent, |
| target_cu); |
| baton->offset_info.offset = offset; |
| baton->offset_info.type = die_type (target_die, target_cu); |
| prop->data.baton = baton; |
| prop->kind = PROP_ADDR_OFFSET; |
| break; |
| } |
| } |
| } |
| else if (attr_form_is_constant (attr)) |
| { |
| prop->data.const_val = dwarf2_get_attr_constant_value (attr, 0); |
| prop->kind = PROP_CONST; |
| } |
| else |
| { |
| dwarf2_invalid_attrib_class_complaint (dwarf_form_name (attr->form), |
| dwarf2_name (die, cu)); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* Read the given DW_AT_subrange DIE. */ |
| |
| static struct type * |
| read_subrange_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *base_type, *orig_base_type; |
| struct type *range_type; |
| struct attribute *attr; |
| struct dynamic_prop low, high; |
| int low_default_is_valid; |
| int high_bound_is_count = 0; |
| const char *name; |
| LONGEST negative_mask; |
| |
| orig_base_type = die_type (die, cu); |
| /* If ORIG_BASE_TYPE is a typedef, it will not be TYPE_UNSIGNED, |
| whereas the real type might be. So, we use ORIG_BASE_TYPE when |
| creating the range type, but we use the result of check_typedef |
| when examining properties of the type. */ |
| base_type = check_typedef (orig_base_type); |
| |
| /* The die_type call above may have already set the type for this DIE. */ |
| range_type = get_die_type (die, cu); |
| if (range_type) |
| return range_type; |
| |
| low.kind = PROP_CONST; |
| high.kind = PROP_CONST; |
| high.data.const_val = 0; |
| |
| /* Set LOW_DEFAULT_IS_VALID if current language and DWARF version allow |
| omitting DW_AT_lower_bound. */ |
| switch (cu->language) |
| { |
| case language_c: |
| case language_cplus: |
| low.data.const_val = 0; |
| low_default_is_valid = 1; |
| break; |
| case language_fortran: |
| low.data.const_val = 1; |
| low_default_is_valid = 1; |
| break; |
| case language_d: |
| case language_objc: |
| case language_rust: |
| low.data.const_val = 0; |
| low_default_is_valid = (cu->header.version >= 4); |
| break; |
| case language_ada: |
| case language_m2: |
| case language_pascal: |
| low.data.const_val = 1; |
| low_default_is_valid = (cu->header.version >= 4); |
| break; |
| default: |
| low.data.const_val = 0; |
| low_default_is_valid = 0; |
| break; |
| } |
| |
| attr = dwarf2_attr (die, DW_AT_lower_bound, cu); |
| if (attr) |
| attr_to_dynamic_prop (attr, die, cu, &low); |
| else if (!low_default_is_valid) |
| complaint (&symfile_complaints, _("Missing DW_AT_lower_bound " |
| "- DIE at 0x%x [in module %s]"), |
| die->offset.sect_off, objfile_name (cu->objfile)); |
| |
| attr = dwarf2_attr (die, DW_AT_upper_bound, cu); |
| if (!attr_to_dynamic_prop (attr, die, cu, &high)) |
| { |
| attr = dwarf2_attr (die, DW_AT_count, cu); |
| if (attr_to_dynamic_prop (attr, die, cu, &high)) |
| { |
| /* If bounds are constant do the final calculation here. */ |
| if (low.kind == PROP_CONST && high.kind == PROP_CONST) |
| high.data.const_val = low.data.const_val + high.data.const_val - 1; |
| else |
| high_bound_is_count = 1; |
| } |
| } |
| |
| /* Dwarf-2 specifications explicitly allows to create subrange types |
| without specifying a base type. |
| In that case, the base type must be set to the type of |
| the lower bound, upper bound or count, in that order, if any of these |
| three attributes references an object that has a type. |
| If no base type is found, the Dwarf-2 specifications say that |
| a signed integer type of size equal to the size of an address should |
| be used. |
| For the following C code: `extern char gdb_int [];' |
| GCC produces an empty range DIE. |
| FIXME: muller/2010-05-28: Possible references to object for low bound, |
| high bound or count are not yet handled by this code. */ |
| if (TYPE_CODE (base_type) == TYPE_CODE_VOID) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| int addr_size = gdbarch_addr_bit (gdbarch) /8; |
| struct type *int_type = objfile_type (objfile)->builtin_int; |
| |
| /* Test "int", "long int", and "long long int" objfile types, |
| and select the first one having a size above or equal to the |
| architecture address size. */ |
| if (int_type && TYPE_LENGTH (int_type) >= addr_size) |
| base_type = int_type; |
| else |
| { |
| int_type = objfile_type (objfile)->builtin_long; |
| if (int_type && TYPE_LENGTH (int_type) >= addr_size) |
| base_type = int_type; |
| else |
| { |
| int_type = objfile_type (objfile)->builtin_long_long; |
| if (int_type && TYPE_LENGTH (int_type) >= addr_size) |
| base_type = int_type; |
| } |
| } |
| } |
| |
| /* Normally, the DWARF producers are expected to use a signed |
| constant form (Eg. DW_FORM_sdata) to express negative bounds. |
| But this is unfortunately not always the case, as witnessed |
| with GCC, for instance, where the ambiguous DW_FORM_dataN form |
| is used instead. To work around that ambiguity, we treat |
| the bounds as signed, and thus sign-extend their values, when |
| the base type is signed. */ |
| negative_mask = |
| -((LONGEST) 1 << (TYPE_LENGTH (base_type) * TARGET_CHAR_BIT - 1)); |
| if (low.kind == PROP_CONST |
| && !TYPE_UNSIGNED (base_type) && (low.data.const_val & negative_mask)) |
| low.data.const_val |= negative_mask; |
| if (high.kind == PROP_CONST |
| && !TYPE_UNSIGNED (base_type) && (high.data.const_val & negative_mask)) |
| high.data.const_val |= negative_mask; |
| |
| range_type = create_range_type (NULL, orig_base_type, &low, &high); |
| |
| if (high_bound_is_count) |
| TYPE_RANGE_DATA (range_type)->flag_upper_bound_is_count = 1; |
| |
| /* Ada expects an empty array on no boundary attributes. */ |
| if (attr == NULL && cu->language != language_ada) |
| TYPE_HIGH_BOUND_KIND (range_type) = PROP_UNDEFINED; |
| |
| name = dwarf2_name (die, cu); |
| if (name) |
| TYPE_NAME (range_type) = name; |
| |
| attr = dwarf2_attr (die, DW_AT_byte_size, cu); |
| if (attr) |
| TYPE_LENGTH (range_type) = DW_UNSND (attr); |
| |
| set_die_type (die, range_type, cu); |
| |
| /* set_die_type should be already done. */ |
| set_descriptive_type (range_type, die, cu); |
| |
| return range_type; |
| } |
| |
| static struct type * |
| read_unspecified_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *type; |
| |
| /* For now, we only support the C meaning of an unspecified type: void. */ |
| |
| type = init_type (cu->objfile, TYPE_CODE_VOID, 0, NULL); |
| TYPE_NAME (type) = dwarf2_name (die, cu); |
| |
| return set_die_type (die, type, cu); |
| } |
| |
| /* Read a single die and all its descendents. Set the die's sibling |
| field to NULL; set other fields in the die correctly, and set all |
| of the descendents' fields correctly. Set *NEW_INFO_PTR to the |
| location of the info_ptr after reading all of those dies. PARENT |
| is the parent of the die in question. */ |
| |
| static struct die_info * |
| read_die_and_children (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| const gdb_byte **new_info_ptr, |
| struct die_info *parent) |
| { |
| struct die_info *die; |
| const gdb_byte *cur_ptr; |
| int has_children; |
| |
| cur_ptr = read_full_die_1 (reader, &die, info_ptr, &has_children, 0); |
| if (die == NULL) |
| { |
| *new_info_ptr = cur_ptr; |
| return NULL; |
| } |
| store_in_ref_table (die, reader->cu); |
| |
| if (has_children) |
| die->child = read_die_and_siblings_1 (reader, cur_ptr, new_info_ptr, die); |
| else |
| { |
| die->child = NULL; |
| *new_info_ptr = cur_ptr; |
| } |
| |
| die->sibling = NULL; |
| die->parent = parent; |
| return die; |
| } |
| |
| /* Read a die, all of its descendents, and all of its siblings; set |
| all of the fields of all of the dies correctly. Arguments are as |
| in read_die_and_children. */ |
| |
| static struct die_info * |
| read_die_and_siblings_1 (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| const gdb_byte **new_info_ptr, |
| struct die_info *parent) |
| { |
| struct die_info *first_die, *last_sibling; |
| const gdb_byte *cur_ptr; |
| |
| cur_ptr = info_ptr; |
| first_die = last_sibling = NULL; |
| |
| while (1) |
| { |
| struct die_info *die |
| = read_die_and_children (reader, cur_ptr, &cur_ptr, parent); |
| |
| if (die == NULL) |
| { |
| *new_info_ptr = cur_ptr; |
| return first_die; |
| } |
| |
| if (!first_die) |
| first_die = die; |
| else |
| last_sibling->sibling = die; |
| |
| last_sibling = die; |
| } |
| } |
| |
| /* Read a die, all of its descendents, and all of its siblings; set |
| all of the fields of all of the dies correctly. Arguments are as |
| in read_die_and_children. |
| This the main entry point for reading a DIE and all its children. */ |
| |
| static struct die_info * |
| read_die_and_siblings (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| const gdb_byte **new_info_ptr, |
| struct die_info *parent) |
| { |
| struct die_info *die = read_die_and_siblings_1 (reader, info_ptr, |
| new_info_ptr, parent); |
| |
| if (dwarf_die_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Read die from %s@0x%x of %s:\n", |
| get_section_name (reader->die_section), |
| (unsigned) (info_ptr - reader->die_section->buffer), |
| bfd_get_filename (reader->abfd)); |
| dump_die (die, dwarf_die_debug); |
| } |
| |
| return die; |
| } |
| |
| /* Read a die and all its attributes, leave space for NUM_EXTRA_ATTRS |
| attributes. |
| The caller is responsible for filling in the extra attributes |
| and updating (*DIEP)->num_attrs. |
| Set DIEP to point to a newly allocated die with its information, |
| except for its child, sibling, and parent fields. |
| Set HAS_CHILDREN to tell whether the die has children or not. */ |
| |
| static const gdb_byte * |
| read_full_die_1 (const struct die_reader_specs *reader, |
| struct die_info **diep, const gdb_byte *info_ptr, |
| int *has_children, int num_extra_attrs) |
| { |
| unsigned int abbrev_number, bytes_read, i; |
| sect_offset offset; |
| struct abbrev_info *abbrev; |
| struct die_info *die; |
| struct dwarf2_cu *cu = reader->cu; |
| bfd *abfd = reader->abfd; |
| |
| offset.sect_off = info_ptr - reader->buffer; |
| abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| if (!abbrev_number) |
| { |
| *diep = NULL; |
| *has_children = 0; |
| return info_ptr; |
| } |
| |
| abbrev = abbrev_table_lookup_abbrev (cu->abbrev_table, abbrev_number); |
| if (!abbrev) |
| error (_("Dwarf Error: could not find abbrev number %d [in module %s]"), |
| abbrev_number, |
| bfd_get_filename (abfd)); |
| |
| die = dwarf_alloc_die (cu, abbrev->num_attrs + num_extra_attrs); |
| die->offset = offset; |
| die->tag = abbrev->tag; |
| die->abbrev = abbrev_number; |
| |
| /* Make the result usable. |
| The caller needs to update num_attrs after adding the extra |
| attributes. */ |
| die->num_attrs = abbrev->num_attrs; |
| |
| for (i = 0; i < abbrev->num_attrs; ++i) |
| info_ptr = read_attribute (reader, &die->attrs[i], &abbrev->attrs[i], |
| info_ptr); |
| |
| *diep = die; |
| *has_children = abbrev->has_children; |
| return info_ptr; |
| } |
| |
| /* Read a die and all its attributes. |
| Set DIEP to point to a newly allocated die with its information, |
| except for its child, sibling, and parent fields. |
| Set HAS_CHILDREN to tell whether the die has children or not. */ |
| |
| static const gdb_byte * |
| read_full_die (const struct die_reader_specs *reader, |
| struct die_info **diep, const gdb_byte *info_ptr, |
| int *has_children) |
| { |
| const gdb_byte *result; |
| |
| result = read_full_die_1 (reader, diep, info_ptr, has_children, 0); |
| |
| if (dwarf_die_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Read die from %s@0x%x of %s:\n", |
| get_section_name (reader->die_section), |
| (unsigned) (info_ptr - reader->die_section->buffer), |
| bfd_get_filename (reader->abfd)); |
| dump_die (*diep, dwarf_die_debug); |
| } |
| |
| return result; |
| } |
| |
| /* Abbreviation tables. |
| |
| In DWARF version 2, the description of the debugging information is |
| stored in a separate .debug_abbrev section. Before we read any |
| dies from a section we read in all abbreviations and install them |
| in a hash table. */ |
| |
| /* Allocate space for a struct abbrev_info object in ABBREV_TABLE. */ |
| |
| static struct abbrev_info * |
| abbrev_table_alloc_abbrev (struct abbrev_table *abbrev_table) |
| { |
| struct abbrev_info *abbrev; |
| |
| abbrev = XOBNEW (&abbrev_table->abbrev_obstack, struct abbrev_info); |
| memset (abbrev, 0, sizeof (struct abbrev_info)); |
| |
| return abbrev; |
| } |
| |
| /* Add an abbreviation to the table. */ |
| |
| static void |
| abbrev_table_add_abbrev (struct abbrev_table *abbrev_table, |
| unsigned int abbrev_number, |
| struct abbrev_info *abbrev) |
| { |
| unsigned int hash_number; |
| |
| hash_number = abbrev_number % ABBREV_HASH_SIZE; |
| abbrev->next = abbrev_table->abbrevs[hash_number]; |
| abbrev_table->abbrevs[hash_number] = abbrev; |
| } |
| |
| /* Look up an abbrev in the table. |
| Returns NULL if the abbrev is not found. */ |
| |
| static struct abbrev_info * |
| abbrev_table_lookup_abbrev (const struct abbrev_table *abbrev_table, |
| unsigned int abbrev_number) |
| { |
| unsigned int hash_number; |
| struct abbrev_info *abbrev; |
| |
| hash_number = abbrev_number % ABBREV_HASH_SIZE; |
| abbrev = abbrev_table->abbrevs[hash_number]; |
| |
| while (abbrev) |
| { |
| if (abbrev->number == abbrev_number) |
| return abbrev; |
| abbrev = abbrev->next; |
| } |
| return NULL; |
| } |
| |
| /* Read in an abbrev table. */ |
| |
| static struct abbrev_table * |
| abbrev_table_read_table (struct dwarf2_section_info *section, |
| sect_offset offset) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| bfd *abfd = get_section_bfd_owner (section); |
| struct abbrev_table *abbrev_table; |
| const gdb_byte *abbrev_ptr; |
| struct abbrev_info *cur_abbrev; |
| unsigned int abbrev_number, bytes_read, abbrev_name; |
| unsigned int abbrev_form; |
| struct attr_abbrev *cur_attrs; |
| unsigned int allocated_attrs; |
| |
| abbrev_table = XNEW (struct abbrev_table); |
| abbrev_table->offset = offset; |
| obstack_init (&abbrev_table->abbrev_obstack); |
| abbrev_table->abbrevs = |
| XOBNEWVEC (&abbrev_table->abbrev_obstack, struct abbrev_info *, |
| ABBREV_HASH_SIZE); |
| memset (abbrev_table->abbrevs, 0, |
| ABBREV_HASH_SIZE * sizeof (struct abbrev_info *)); |
| |
| dwarf2_read_section (objfile, section); |
| abbrev_ptr = section->buffer + offset.sect_off; |
| abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| |
| allocated_attrs = ATTR_ALLOC_CHUNK; |
| cur_attrs = XNEWVEC (struct attr_abbrev, allocated_attrs); |
| |
| /* Loop until we reach an abbrev number of 0. */ |
| while (abbrev_number) |
| { |
| cur_abbrev = abbrev_table_alloc_abbrev (abbrev_table); |
| |
| /* read in abbrev header */ |
| cur_abbrev->number = abbrev_number; |
| cur_abbrev->tag |
| = (enum dwarf_tag) read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr); |
| abbrev_ptr += 1; |
| |
| /* now read in declarations */ |
| abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| while (abbrev_name) |
| { |
| if (cur_abbrev->num_attrs == allocated_attrs) |
| { |
| allocated_attrs += ATTR_ALLOC_CHUNK; |
| cur_attrs |
| = XRESIZEVEC (struct attr_abbrev, cur_attrs, allocated_attrs); |
| } |
| |
| cur_attrs[cur_abbrev->num_attrs].name |
| = (enum dwarf_attribute) abbrev_name; |
| cur_attrs[cur_abbrev->num_attrs++].form |
| = (enum dwarf_form) abbrev_form; |
| abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| } |
| |
| cur_abbrev->attrs = |
| XOBNEWVEC (&abbrev_table->abbrev_obstack, struct attr_abbrev, |
| cur_abbrev->num_attrs); |
| memcpy (cur_abbrev->attrs, cur_attrs, |
| cur_abbrev->num_attrs * sizeof (struct attr_abbrev)); |
| |
| abbrev_table_add_abbrev (abbrev_table, abbrev_number, cur_abbrev); |
| |
| /* Get next abbreviation. |
| Under Irix6 the abbreviations for a compilation unit are not |
| always properly terminated with an abbrev number of 0. |
| Exit loop if we encounter an abbreviation which we have |
| already read (which means we are about to read the abbreviations |
| for the next compile unit) or if the end of the abbreviation |
| table is reached. */ |
| if ((unsigned int) (abbrev_ptr - section->buffer) >= section->size) |
| break; |
| abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read); |
| abbrev_ptr += bytes_read; |
| if (abbrev_table_lookup_abbrev (abbrev_table, abbrev_number) != NULL) |
| break; |
| } |
| |
| xfree (cur_attrs); |
| return abbrev_table; |
| } |
| |
| /* Free the resources held by ABBREV_TABLE. */ |
| |
| static void |
| abbrev_table_free (struct abbrev_table *abbrev_table) |
| { |
| obstack_free (&abbrev_table->abbrev_obstack, NULL); |
| xfree (abbrev_table); |
| } |
| |
| /* Same as abbrev_table_free but as a cleanup. |
| We pass in a pointer to the pointer to the table so that we can |
| set the pointer to NULL when we're done. It also simplifies |
| build_type_psymtabs_1. */ |
| |
| static void |
| abbrev_table_free_cleanup (void *table_ptr) |
| { |
| struct abbrev_table **abbrev_table_ptr = (struct abbrev_table **) table_ptr; |
| |
| if (*abbrev_table_ptr != NULL) |
| abbrev_table_free (*abbrev_table_ptr); |
| *abbrev_table_ptr = NULL; |
| } |
| |
| /* Read the abbrev table for CU from ABBREV_SECTION. */ |
| |
| static void |
| dwarf2_read_abbrevs (struct dwarf2_cu *cu, |
| struct dwarf2_section_info *abbrev_section) |
| { |
| cu->abbrev_table = |
| abbrev_table_read_table (abbrev_section, cu->header.abbrev_offset); |
| } |
| |
| /* Release the memory used by the abbrev table for a compilation unit. */ |
| |
| static void |
| dwarf2_free_abbrev_table (void *ptr_to_cu) |
| { |
| struct dwarf2_cu *cu = (struct dwarf2_cu *) ptr_to_cu; |
| |
| if (cu->abbrev_table != NULL) |
| abbrev_table_free (cu->abbrev_table); |
| /* Set this to NULL so that we SEGV if we try to read it later, |
| and also because free_comp_unit verifies this is NULL. */ |
| cu->abbrev_table = NULL; |
| } |
| |
| /* Returns nonzero if TAG represents a type that we might generate a partial |
| symbol for. */ |
| |
| static int |
| is_type_tag_for_partial (int tag) |
| { |
| switch (tag) |
| { |
| #if 0 |
| /* Some types that would be reasonable to generate partial symbols for, |
| that we don't at present. */ |
| case DW_TAG_array_type: |
| case DW_TAG_file_type: |
| case DW_TAG_ptr_to_member_type: |
| case DW_TAG_set_type: |
| case DW_TAG_string_type: |
| case DW_TAG_subroutine_type: |
| #endif |
| case DW_TAG_base_type: |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_enumeration_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_subrange_type: |
| case DW_TAG_typedef: |
| case DW_TAG_union_type: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| /* Load all DIEs that are interesting for partial symbols into memory. */ |
| |
| static struct partial_die_info * |
| load_partial_dies (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, int building_psymtab) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct objfile *objfile = cu->objfile; |
| struct partial_die_info *part_die; |
| struct partial_die_info *parent_die, *last_die, *first_die = NULL; |
| struct abbrev_info *abbrev; |
| unsigned int bytes_read; |
| unsigned int load_all = 0; |
| int nesting_level = 1; |
| |
| parent_die = NULL; |
| last_die = NULL; |
| |
| gdb_assert (cu->per_cu != NULL); |
| if (cu->per_cu->load_all_dies) |
| load_all = 1; |
| |
| cu->partial_dies |
| = htab_create_alloc_ex (cu->header.length / 12, |
| partial_die_hash, |
| partial_die_eq, |
| NULL, |
| &cu->comp_unit_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| |
| part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info); |
| |
| while (1) |
| { |
| abbrev = peek_die_abbrev (info_ptr, &bytes_read, cu); |
| |
| /* A NULL abbrev means the end of a series of children. */ |
| if (abbrev == NULL) |
| { |
| if (--nesting_level == 0) |
| { |
| /* PART_DIE was probably the last thing allocated on the |
| comp_unit_obstack, so we could call obstack_free |
| here. We don't do that because the waste is small, |
| and will be cleaned up when we're done with this |
| compilation unit. This way, we're also more robust |
| against other users of the comp_unit_obstack. */ |
| return first_die; |
| } |
| info_ptr += bytes_read; |
| last_die = parent_die; |
| parent_die = parent_die->die_parent; |
| continue; |
| } |
| |
| /* Check for template arguments. We never save these; if |
| they're seen, we just mark the parent, and go on our way. */ |
| if (parent_die != NULL |
| && cu->language == language_cplus |
| && (abbrev->tag == DW_TAG_template_type_param |
| || abbrev->tag == DW_TAG_template_value_param)) |
| { |
| parent_die->has_template_arguments = 1; |
| |
| if (!load_all) |
| { |
| /* We don't need a partial DIE for the template argument. */ |
| info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); |
| continue; |
| } |
| } |
| |
| /* We only recurse into c++ subprograms looking for template arguments. |
| Skip their other children. */ |
| if (!load_all |
| && cu->language == language_cplus |
| && parent_die != NULL |
| && parent_die->tag == DW_TAG_subprogram) |
| { |
| info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); |
| continue; |
| } |
| |
| /* Check whether this DIE is interesting enough to save. Normally |
| we would not be interested in members here, but there may be |
| later variables referencing them via DW_AT_specification (for |
| static members). */ |
| if (!load_all |
| && !is_type_tag_for_partial (abbrev->tag) |
| && abbrev->tag != DW_TAG_constant |
| && abbrev->tag != DW_TAG_enumerator |
| && abbrev->tag != DW_TAG_subprogram |
| && abbrev->tag != DW_TAG_lexical_block |
| && abbrev->tag != DW_TAG_variable |
| && abbrev->tag != DW_TAG_namespace |
| && abbrev->tag != DW_TAG_module |
| && abbrev->tag != DW_TAG_member |
| && abbrev->tag != DW_TAG_imported_unit |
| && abbrev->tag != DW_TAG_imported_declaration) |
| { |
| /* Otherwise we skip to the next sibling, if any. */ |
| info_ptr = skip_one_die (reader, info_ptr + bytes_read, abbrev); |
| continue; |
| } |
| |
| info_ptr = read_partial_die (reader, part_die, abbrev, bytes_read, |
| info_ptr); |
| |
| /* This two-pass algorithm for processing partial symbols has a |
| high cost in cache pressure. Thus, handle some simple cases |
| here which cover the majority of C partial symbols. DIEs |
| which neither have specification tags in them, nor could have |
| specification tags elsewhere pointing at them, can simply be |
| processed and discarded. |
| |
| This segment is also optional; scan_partial_symbols and |
| add_partial_symbol will handle these DIEs if we chain |
| them in normally. When compilers which do not emit large |
| quantities of duplicate debug information are more common, |
| this code can probably be removed. */ |
| |
| /* Any complete simple types at the top level (pretty much all |
| of them, for a language without namespaces), can be processed |
| directly. */ |
| if (parent_die == NULL |
| && part_die->has_specification == 0 |
| && part_die->is_declaration == 0 |
| && ((part_die->tag == DW_TAG_typedef && !part_die->has_children) |
| || part_die->tag == DW_TAG_base_type |
| || part_die->tag == DW_TAG_subrange_type)) |
| { |
| if (building_psymtab && part_die->name != NULL) |
| add_psymbol_to_list (part_die->name, strlen (part_die->name), 0, |
| VAR_DOMAIN, LOC_TYPEDEF, |
| &objfile->static_psymbols, |
| 0, cu->language, objfile); |
| info_ptr = locate_pdi_sibling (reader, part_die, info_ptr); |
| continue; |
| } |
| |
| /* The exception for DW_TAG_typedef with has_children above is |
| a workaround of GCC PR debug/47510. In the case of this complaint |
| type_name_no_tag_or_error will error on such types later. |
| |
| GDB skipped children of DW_TAG_typedef by the shortcut above and then |
| it could not find the child DIEs referenced later, this is checked |
| above. In correct DWARF DW_TAG_typedef should have no children. */ |
| |
| if (part_die->tag == DW_TAG_typedef && part_die->has_children) |
| complaint (&symfile_complaints, |
| _("DW_TAG_typedef has childen - GCC PR debug/47510 bug " |
| "- DIE at 0x%x [in module %s]"), |
| part_die->offset.sect_off, objfile_name (objfile)); |
| |
| /* If we're at the second level, and we're an enumerator, and |
| our parent has no specification (meaning possibly lives in a |
| namespace elsewhere), then we can add the partial symbol now |
| instead of queueing it. */ |
| if (part_die->tag == DW_TAG_enumerator |
| && parent_die != NULL |
| && parent_die->die_parent == NULL |
| && parent_die->tag == DW_TAG_enumeration_type |
| && parent_die->has_specification == 0) |
| { |
| if (part_die->name == NULL) |
| complaint (&symfile_complaints, |
| _("malformed enumerator DIE ignored")); |
| else if (building_psymtab) |
| add_psymbol_to_list (part_die->name, strlen (part_die->name), 0, |
| VAR_DOMAIN, LOC_CONST, |
| cu->language == language_cplus |
| ? &objfile->global_psymbols |
| : &objfile->static_psymbols, |
| 0, cu->language, objfile); |
| |
| info_ptr = locate_pdi_sibling (reader, part_die, info_ptr); |
| continue; |
| } |
| |
| /* We'll save this DIE so link it in. */ |
| part_die->die_parent = parent_die; |
| part_die->die_sibling = NULL; |
| part_die->die_child = NULL; |
| |
| if (last_die && last_die == parent_die) |
| last_die->die_child = part_die; |
| else if (last_die) |
| last_die->die_sibling = part_die; |
| |
| last_die = part_die; |
| |
| if (first_die == NULL) |
| first_die = part_die; |
| |
| /* Maybe add the DIE to the hash table. Not all DIEs that we |
| find interesting need to be in the hash table, because we |
| also have the parent/sibling/child chains; only those that we |
| might refer to by offset later during partial symbol reading. |
| |
| For now this means things that might have be the target of a |
| DW_AT_specification, DW_AT_abstract_origin, or |
| DW_AT_extension. DW_AT_extension will refer only to |
| namespaces; DW_AT_abstract_origin refers to functions (and |
| many things under the function DIE, but we do not recurse |
| into function DIEs during partial symbol reading) and |
| possibly variables as well; DW_AT_specification refers to |
| declarations. Declarations ought to have the DW_AT_declaration |
| flag. It happens that GCC forgets to put it in sometimes, but |
| only for functions, not for types. |
| |
| Adding more things than necessary to the hash table is harmless |
| except for the performance cost. Adding too few will result in |
| wasted time in find_partial_die, when we reread the compilation |
| unit with load_all_dies set. */ |
| |
| if (load_all |
| || abbrev->tag == DW_TAG_constant |
| || abbrev->tag == DW_TAG_subprogram |
| || abbrev->tag == DW_TAG_variable |
| || abbrev->tag == DW_TAG_namespace |
| || part_die->is_declaration) |
| { |
| void **slot; |
| |
| slot = htab_find_slot_with_hash (cu->partial_dies, part_die, |
| part_die->offset.sect_off, INSERT); |
| *slot = part_die; |
| } |
| |
| part_die = XOBNEW (&cu->comp_unit_obstack, struct partial_die_info); |
| |
| /* For some DIEs we want to follow their children (if any). For C |
| we have no reason to follow the children of structures; for other |
| languages we have to, so that we can get at method physnames |
| to infer fully qualified class names, for DW_AT_specification, |
| and for C++ template arguments. For C++, we also look one level |
| inside functions to find template arguments (if the name of the |
| function does not already contain the template arguments). |
| |
| For Ada, we need to scan the children of subprograms and lexical |
| blocks as well because Ada allows the definition of nested |
| entities that could be interesting for the debugger, such as |
| nested subprograms for instance. */ |
| if (last_die->has_children |
| && (load_all |
| || last_die->tag == DW_TAG_namespace |
| || last_die->tag == DW_TAG_module |
| || last_die->tag == DW_TAG_enumeration_type |
| || (cu->language == language_cplus |
| && last_die->tag == DW_TAG_subprogram |
| && (last_die->name == NULL |
| || strchr (last_die->name, '<') == NULL)) |
| || (cu->language != language_c |
| && (last_die->tag == DW_TAG_class_type |
| || last_die->tag == DW_TAG_interface_type |
| || last_die->tag == DW_TAG_structure_type |
| || last_die->tag == DW_TAG_union_type)) |
| || (cu->language == language_ada |
| && (last_die->tag == DW_TAG_subprogram |
| || last_die->tag == DW_TAG_lexical_block)))) |
| { |
| nesting_level++; |
| parent_die = last_die; |
| continue; |
| } |
| |
| /* Otherwise we skip to the next sibling, if any. */ |
| info_ptr = locate_pdi_sibling (reader, last_die, info_ptr); |
| |
| /* Back to the top, do it again. */ |
| } |
| } |
| |
| /* Read a minimal amount of information into the minimal die structure. */ |
| |
| static const gdb_byte * |
| read_partial_die (const struct die_reader_specs *reader, |
| struct partial_die_info *part_die, |
| struct abbrev_info *abbrev, unsigned int abbrev_len, |
| const gdb_byte *info_ptr) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct objfile *objfile = cu->objfile; |
| const gdb_byte *buffer = reader->buffer; |
| unsigned int i; |
| struct attribute attr; |
| int has_low_pc_attr = 0; |
| int has_high_pc_attr = 0; |
| int high_pc_relative = 0; |
| |
| memset (part_die, 0, sizeof (struct partial_die_info)); |
| |
| part_die->offset.sect_off = info_ptr - buffer; |
| |
| info_ptr += abbrev_len; |
| |
| if (abbrev == NULL) |
| return info_ptr; |
| |
| part_die->tag = abbrev->tag; |
| part_die->has_children = abbrev->has_children; |
| |
| for (i = 0; i < abbrev->num_attrs; ++i) |
| { |
| info_ptr = read_attribute (reader, &attr, &abbrev->attrs[i], info_ptr); |
| |
| /* Store the data if it is of an attribute we want to keep in a |
| partial symbol table. */ |
| switch (attr.name) |
| { |
| case DW_AT_name: |
| switch (part_die->tag) |
| { |
| case DW_TAG_compile_unit: |
| case DW_TAG_partial_unit: |
| case DW_TAG_type_unit: |
| /* Compilation units have a DW_AT_name that is a filename, not |
| a source language identifier. */ |
| case DW_TAG_enumeration_type: |
| case DW_TAG_enumerator: |
| /* These tags always have simple identifiers already; no need |
| to canonicalize them. */ |
| part_die->name = DW_STRING (&attr); |
| break; |
| default: |
| part_die->name |
| = dwarf2_canonicalize_name (DW_STRING (&attr), cu, |
| &objfile->per_bfd->storage_obstack); |
| break; |
| } |
| break; |
| case DW_AT_linkage_name: |
| case DW_AT_MIPS_linkage_name: |
| /* Note that both forms of linkage name might appear. We |
| assume they will be the same, and we only store the last |
| one we see. */ |
| if (cu->language == language_ada) |
| part_die->name = DW_STRING (&attr); |
| part_die->linkage_name = DW_STRING (&attr); |
| break; |
| case DW_AT_low_pc: |
| has_low_pc_attr = 1; |
| part_die->lowpc = attr_value_as_address (&attr); |
| break; |
| case DW_AT_high_pc: |
| has_high_pc_attr = 1; |
| part_die->highpc = attr_value_as_address (&attr); |
| if (cu->header.version >= 4 && attr_form_is_constant (&attr)) |
| high_pc_relative = 1; |
| break; |
| case DW_AT_location: |
| /* Support the .debug_loc offsets. */ |
| if (attr_form_is_block (&attr)) |
| { |
| part_die->d.locdesc = DW_BLOCK (&attr); |
| } |
| else if (attr_form_is_section_offset (&attr)) |
| { |
| dwarf2_complex_location_expr_complaint (); |
| } |
| else |
| { |
| dwarf2_invalid_attrib_class_complaint ("DW_AT_location", |
| "partial symbol information"); |
| } |
| break; |
| case DW_AT_external: |
| part_die->is_external = DW_UNSND (&attr); |
| break; |
| case DW_AT_declaration: |
| part_die->is_declaration = DW_UNSND (&attr); |
| break; |
| case DW_AT_type: |
| part_die->has_type = 1; |
| break; |
| case DW_AT_abstract_origin: |
| case DW_AT_specification: |
| case DW_AT_extension: |
| part_die->has_specification = 1; |
| part_die->spec_offset = dwarf2_get_ref_die_offset (&attr); |
| part_die->spec_is_dwz = (attr.form == DW_FORM_GNU_ref_alt |
| || cu->per_cu->is_dwz); |
| break; |
| case DW_AT_sibling: |
| /* Ignore absolute siblings, they might point outside of |
| the current compile unit. */ |
| if (attr.form == DW_FORM_ref_addr) |
| complaint (&symfile_complaints, |
| _("ignoring absolute DW_AT_sibling")); |
| else |
| { |
| unsigned int off = dwarf2_get_ref_die_offset (&attr).sect_off; |
| const gdb_byte *sibling_ptr = buffer + off; |
| |
| if (sibling_ptr < info_ptr) |
| complaint (&symfile_complaints, |
| _("DW_AT_sibling points backwards")); |
| else if (sibling_ptr > reader->buffer_end) |
| dwarf2_section_buffer_overflow_complaint (reader->die_section); |
| else |
| part_die->sibling = sibling_ptr; |
| } |
| break; |
| case DW_AT_byte_size: |
| part_die->has_byte_size = 1; |
| break; |
| case DW_AT_const_value: |
| part_die->has_const_value = 1; |
| break; |
| case DW_AT_calling_convention: |
| /* DWARF doesn't provide a way to identify a program's source-level |
| entry point. DW_AT_calling_convention attributes are only meant |
| to describe functions' calling conventions. |
| |
| However, because it's a necessary piece of information in |
| Fortran, and because DW_CC_program is the only piece of debugging |
| information whose definition refers to a 'main program' at all, |
| several compilers have begun marking Fortran main programs with |
| DW_CC_program --- even when those functions use the standard |
| calling conventions. |
| |
| So until DWARF specifies a way to provide this information and |
| compilers pick up the new representation, we'll support this |
| practice. */ |
| if (DW_UNSND (&attr) == DW_CC_program |
| && cu->language == language_fortran |
| && part_die->name != NULL) |
| set_objfile_main_name (objfile, part_die->name, language_fortran); |
| break; |
| case DW_AT_inline: |
| if (DW_UNSND (&attr) == DW_INL_inlined |
| || DW_UNSND (&attr) == DW_INL_declared_inlined) |
| part_die->may_be_inlined = 1; |
| break; |
| |
| case DW_AT_import: |
| if (part_die->tag == DW_TAG_imported_unit) |
| { |
| part_die->d.offset = dwarf2_get_ref_die_offset (&attr); |
| part_die->is_dwz = (attr.form == DW_FORM_GNU_ref_alt |
| || cu->per_cu->is_dwz); |
| } |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| if (high_pc_relative) |
| part_die->highpc += part_die->lowpc; |
| |
| if (has_low_pc_attr && has_high_pc_attr) |
| { |
| /* When using the GNU linker, .gnu.linkonce. sections are used to |
| eliminate duplicate copies of functions and vtables and such. |
| The linker will arbitrarily choose one and discard the others. |
| The AT_*_pc values for such functions refer to local labels in |
| these sections. If the section from that file was discarded, the |
| labels are not in the output, so the relocs get a value of 0. |
| If this is a discarded function, mark the pc bounds as invalid, |
| so that GDB will ignore it. */ |
| if (part_die->lowpc == 0 && !dwarf2_per_objfile->has_section_at_zero) |
| { |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| |
| complaint (&symfile_complaints, |
| _("DW_AT_low_pc %s is zero " |
| "for DIE at 0x%x [in module %s]"), |
| paddress (gdbarch, part_die->lowpc), |
| part_die->offset.sect_off, objfile_name (objfile)); |
| } |
| /* dwarf2_get_pc_bounds has also the strict low < high requirement. */ |
| else if (part_die->lowpc >= part_die->highpc) |
| { |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| |
| complaint (&symfile_complaints, |
| _("DW_AT_low_pc %s is not < DW_AT_high_pc %s " |
| "for DIE at 0x%x [in module %s]"), |
| paddress (gdbarch, part_die->lowpc), |
| paddress (gdbarch, part_die->highpc), |
| part_die->offset.sect_off, objfile_name (objfile)); |
| } |
| else |
| part_die->has_pc_info = 1; |
| } |
| |
| return info_ptr; |
| } |
| |
| /* Find a cached partial DIE at OFFSET in CU. */ |
| |
| static struct partial_die_info * |
| find_partial_die_in_comp_unit (sect_offset offset, struct dwarf2_cu *cu) |
| { |
| struct partial_die_info *lookup_die = NULL; |
| struct partial_die_info part_die; |
| |
| part_die.offset = offset; |
| lookup_die = ((struct partial_die_info *) |
| htab_find_with_hash (cu->partial_dies, &part_die, |
| offset.sect_off)); |
| |
| return lookup_die; |
| } |
| |
| /* Find a partial DIE at OFFSET, which may or may not be in CU, |
| except in the case of .debug_types DIEs which do not reference |
| outside their CU (they do however referencing other types via |
| DW_FORM_ref_sig8). */ |
| |
| static struct partial_die_info * |
| find_partial_die (sect_offset offset, int offset_in_dwz, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct dwarf2_per_cu_data *per_cu = NULL; |
| struct partial_die_info *pd = NULL; |
| |
| if (offset_in_dwz == cu->per_cu->is_dwz |
| && offset_in_cu_p (&cu->header, offset)) |
| { |
| pd = find_partial_die_in_comp_unit (offset, cu); |
| if (pd != NULL) |
| return pd; |
| /* We missed recording what we needed. |
| Load all dies and try again. */ |
| per_cu = cu->per_cu; |
| } |
| else |
| { |
| /* TUs don't reference other CUs/TUs (except via type signatures). */ |
| if (cu->per_cu->is_debug_types) |
| { |
| error (_("Dwarf Error: Type Unit at offset 0x%lx contains" |
| " external reference to offset 0x%lx [in module %s].\n"), |
| (long) cu->header.offset.sect_off, (long) offset.sect_off, |
| bfd_get_filename (objfile->obfd)); |
| } |
| per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz, |
| objfile); |
| |
| if (per_cu->cu == NULL || per_cu->cu->partial_dies == NULL) |
| load_partial_comp_unit (per_cu); |
| |
| per_cu->cu->last_used = 0; |
| pd = find_partial_die_in_comp_unit (offset, per_cu->cu); |
| } |
| |
| /* If we didn't find it, and not all dies have been loaded, |
| load them all and try again. */ |
| |
| if (pd == NULL && per_cu->load_all_dies == 0) |
| { |
| per_cu->load_all_dies = 1; |
| |
| /* This is nasty. When we reread the DIEs, somewhere up the call chain |
| THIS_CU->cu may already be in use. So we can't just free it and |
| replace its DIEs with the ones we read in. Instead, we leave those |
| DIEs alone (which can still be in use, e.g. in scan_partial_symbols), |
| and clobber THIS_CU->cu->partial_dies with the hash table for the new |
| set. */ |
| load_partial_comp_unit (per_cu); |
| |
| pd = find_partial_die_in_comp_unit (offset, per_cu->cu); |
| } |
| |
| if (pd == NULL) |
| internal_error (__FILE__, __LINE__, |
| _("could not find partial DIE 0x%x " |
| "in cache [from module %s]\n"), |
| offset.sect_off, bfd_get_filename (objfile->obfd)); |
| return pd; |
| } |
| |
| /* See if we can figure out if the class lives in a namespace. We do |
| this by looking for a member function; its demangled name will |
| contain namespace info, if there is any. */ |
| |
| static void |
| guess_partial_die_structure_name (struct partial_die_info *struct_pdi, |
| struct dwarf2_cu *cu) |
| { |
| /* NOTE: carlton/2003-10-07: Getting the info this way changes |
| what template types look like, because the demangler |
| frequently doesn't give the same name as the debug info. We |
| could fix this by only using the demangled name to get the |
| prefix (but see comment in read_structure_type). */ |
| |
| struct partial_die_info *real_pdi; |
| struct partial_die_info *child_pdi; |
| |
| /* If this DIE (this DIE's specification, if any) has a parent, then |
| we should not do this. We'll prepend the parent's fully qualified |
| name when we create the partial symbol. */ |
| |
| real_pdi = struct_pdi; |
| while (real_pdi->has_specification) |
| real_pdi = find_partial_die (real_pdi->spec_offset, |
| real_pdi->spec_is_dwz, cu); |
| |
| if (real_pdi->die_parent != NULL) |
| return; |
| |
| for (child_pdi = struct_pdi->die_child; |
| child_pdi != NULL; |
| child_pdi = child_pdi->die_sibling) |
| { |
| if (child_pdi->tag == DW_TAG_subprogram |
| && child_pdi->linkage_name != NULL) |
| { |
| char *actual_class_name |
| = language_class_name_from_physname (cu->language_defn, |
| child_pdi->linkage_name); |
| if (actual_class_name != NULL) |
| { |
| struct_pdi->name |
| = ((const char *) |
| obstack_copy0 (&cu->objfile->per_bfd->storage_obstack, |
| actual_class_name, |
| strlen (actual_class_name))); |
| xfree (actual_class_name); |
| } |
| break; |
| } |
| } |
| } |
| |
| /* Adjust PART_DIE before generating a symbol for it. This function |
| may set the is_external flag or change the DIE's name. */ |
| |
| static void |
| fixup_partial_die (struct partial_die_info *part_die, |
| struct dwarf2_cu *cu) |
| { |
| /* Once we've fixed up a die, there's no point in doing so again. |
| This also avoids a memory leak if we were to call |
| guess_partial_die_structure_name multiple times. */ |
| if (part_die->fixup_called) |
| return; |
| |
| /* If we found a reference attribute and the DIE has no name, try |
| to find a name in the referred to DIE. */ |
| |
| if (part_die->name == NULL && part_die->has_specification) |
| { |
| struct partial_die_info *spec_die; |
| |
| spec_die = find_partial_die (part_die->spec_offset, |
| part_die->spec_is_dwz, cu); |
| |
| fixup_partial_die (spec_die, cu); |
| |
| if (spec_die->name) |
| { |
| part_die->name = spec_die->name; |
| |
| /* Copy DW_AT_external attribute if it is set. */ |
| if (spec_die->is_external) |
| part_die->is_external = spec_die->is_external; |
| } |
| } |
| |
| /* Set default names for some unnamed DIEs. */ |
| |
| if (part_die->name == NULL && part_die->tag == DW_TAG_namespace) |
| part_die->name = CP_ANONYMOUS_NAMESPACE_STR; |
| |
| /* If there is no parent die to provide a namespace, and there are |
| children, see if we can determine the namespace from their linkage |
| name. */ |
| if (cu->language == language_cplus |
| && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types) |
| && part_die->die_parent == NULL |
| && part_die->has_children |
| && (part_die->tag == DW_TAG_class_type |
| || part_die->tag == DW_TAG_structure_type |
| || part_die->tag == DW_TAG_union_type)) |
| guess_partial_die_structure_name (part_die, cu); |
| |
| /* GCC might emit a nameless struct or union that has a linkage |
| name. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ |
| if (part_die->name == NULL |
| && (part_die->tag == DW_TAG_class_type |
| || part_die->tag == DW_TAG_interface_type |
| || part_die->tag == DW_TAG_structure_type |
| || part_die->tag == DW_TAG_union_type) |
| && part_die->linkage_name != NULL) |
| { |
| char *demangled; |
| |
| demangled = gdb_demangle (part_die->linkage_name, DMGL_TYPES); |
| if (demangled) |
| { |
| const char *base; |
| |
| /* Strip any leading namespaces/classes, keep only the base name. |
| DW_AT_name for named DIEs does not contain the prefixes. */ |
| base = strrchr (demangled, ':'); |
| if (base && base > demangled && base[-1] == ':') |
| base++; |
| else |
| base = demangled; |
| |
| part_die->name |
| = ((const char *) |
| obstack_copy0 (&cu->objfile->per_bfd->storage_obstack, |
| base, strlen (base))); |
| xfree (demangled); |
| } |
| } |
| |
| part_die->fixup_called = 1; |
| } |
| |
| /* Read an attribute value described by an attribute form. */ |
| |
| static const gdb_byte * |
| read_attribute_value (const struct die_reader_specs *reader, |
| struct attribute *attr, unsigned form, |
| const gdb_byte *info_ptr) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| bfd *abfd = reader->abfd; |
| struct comp_unit_head *cu_header = &cu->header; |
| unsigned int bytes_read; |
| struct dwarf_block *blk; |
| |
| attr->form = (enum dwarf_form) form; |
| switch (form) |
| { |
| case DW_FORM_ref_addr: |
| if (cu->header.version == 2) |
| DW_UNSND (attr) = read_address (abfd, info_ptr, cu, &bytes_read); |
| else |
| DW_UNSND (attr) = read_offset (abfd, info_ptr, |
| &cu->header, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_GNU_ref_alt: |
| DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_addr: |
| DW_ADDR (attr) = read_address (abfd, info_ptr, cu, &bytes_read); |
| DW_ADDR (attr) = gdbarch_adjust_dwarf2_addr (gdbarch, DW_ADDR (attr)); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_block2: |
| blk = dwarf_alloc_block (cu); |
| blk->size = read_2_bytes (abfd, info_ptr); |
| info_ptr += 2; |
| blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| info_ptr += blk->size; |
| DW_BLOCK (attr) = blk; |
| break; |
| case DW_FORM_block4: |
| blk = dwarf_alloc_block (cu); |
| blk->size = read_4_bytes (abfd, info_ptr); |
| info_ptr += 4; |
| blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| info_ptr += blk->size; |
| DW_BLOCK (attr) = blk; |
| break; |
| case DW_FORM_data2: |
| DW_UNSND (attr) = read_2_bytes (abfd, info_ptr); |
| info_ptr += 2; |
| break; |
| case DW_FORM_data4: |
| DW_UNSND (attr) = read_4_bytes (abfd, info_ptr); |
| info_ptr += 4; |
| break; |
| case DW_FORM_data8: |
| DW_UNSND (attr) = read_8_bytes (abfd, info_ptr); |
| info_ptr += 8; |
| break; |
| case DW_FORM_sec_offset: |
| DW_UNSND (attr) = read_offset (abfd, info_ptr, &cu->header, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_string: |
| DW_STRING (attr) = read_direct_string (abfd, info_ptr, &bytes_read); |
| DW_STRING_IS_CANONICAL (attr) = 0; |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_strp: |
| if (!cu->per_cu->is_dwz) |
| { |
| DW_STRING (attr) = read_indirect_string (abfd, info_ptr, cu_header, |
| &bytes_read); |
| DW_STRING_IS_CANONICAL (attr) = 0; |
| info_ptr += bytes_read; |
| break; |
| } |
| /* FALLTHROUGH */ |
| case DW_FORM_GNU_strp_alt: |
| { |
| struct dwz_file *dwz = dwarf2_get_dwz_file (); |
| LONGEST str_offset = read_offset (abfd, info_ptr, cu_header, |
| &bytes_read); |
| |
| DW_STRING (attr) = read_indirect_string_from_dwz (dwz, str_offset); |
| DW_STRING_IS_CANONICAL (attr) = 0; |
| info_ptr += bytes_read; |
| } |
| break; |
| case DW_FORM_exprloc: |
| case DW_FORM_block: |
| blk = dwarf_alloc_block (cu); |
| blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| info_ptr += blk->size; |
| DW_BLOCK (attr) = blk; |
| break; |
| case DW_FORM_block1: |
| blk = dwarf_alloc_block (cu); |
| blk->size = read_1_byte (abfd, info_ptr); |
| info_ptr += 1; |
| blk->data = read_n_bytes (abfd, info_ptr, blk->size); |
| info_ptr += blk->size; |
| DW_BLOCK (attr) = blk; |
| break; |
| case DW_FORM_data1: |
| DW_UNSND (attr) = read_1_byte (abfd, info_ptr); |
| info_ptr += 1; |
| break; |
| case DW_FORM_flag: |
| DW_UNSND (attr) = read_1_byte (abfd, info_ptr); |
| info_ptr += 1; |
| break; |
| case DW_FORM_flag_present: |
| DW_UNSND (attr) = 1; |
| break; |
| case DW_FORM_sdata: |
| DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_udata: |
| DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_ref1: |
| DW_UNSND (attr) = (cu->header.offset.sect_off |
| + read_1_byte (abfd, info_ptr)); |
| info_ptr += 1; |
| break; |
| case DW_FORM_ref2: |
| DW_UNSND (attr) = (cu->header.offset.sect_off |
| + read_2_bytes (abfd, info_ptr)); |
| info_ptr += 2; |
| break; |
| case DW_FORM_ref4: |
| DW_UNSND (attr) = (cu->header.offset.sect_off |
| + read_4_bytes (abfd, info_ptr)); |
| info_ptr += 4; |
| break; |
| case DW_FORM_ref8: |
| DW_UNSND (attr) = (cu->header.offset.sect_off |
| + read_8_bytes (abfd, info_ptr)); |
| info_ptr += 8; |
| break; |
| case DW_FORM_ref_sig8: |
| DW_SIGNATURE (attr) = read_8_bytes (abfd, info_ptr); |
| info_ptr += 8; |
| break; |
| case DW_FORM_ref_udata: |
| DW_UNSND (attr) = (cu->header.offset.sect_off |
| + read_unsigned_leb128 (abfd, info_ptr, &bytes_read)); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_indirect: |
| form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| info_ptr = read_attribute_value (reader, attr, form, info_ptr); |
| break; |
| case DW_FORM_GNU_addr_index: |
| if (reader->dwo_file == NULL) |
| { |
| /* For now flag a hard error. |
| Later we can turn this into a complaint. */ |
| error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"), |
| dwarf_form_name (form), |
| bfd_get_filename (abfd)); |
| } |
| DW_ADDR (attr) = read_addr_index_from_leb128 (cu, info_ptr, &bytes_read); |
| info_ptr += bytes_read; |
| break; |
| case DW_FORM_GNU_str_index: |
| if (reader->dwo_file == NULL) |
| { |
| /* For now flag a hard error. |
| Later we can turn this into a complaint if warranted. */ |
| error (_("Dwarf Error: %s found in non-DWO CU [in module %s]"), |
| dwarf_form_name (form), |
| bfd_get_filename (abfd)); |
| } |
| { |
| ULONGEST str_index = |
| read_unsigned_leb128 (abfd, info_ptr, &bytes_read); |
| |
| DW_STRING (attr) = read_str_index (reader, str_index); |
| DW_STRING_IS_CANONICAL (attr) = 0; |
| info_ptr += bytes_read; |
| } |
| break; |
| default: |
| error (_("Dwarf Error: Cannot handle %s in DWARF reader [in module %s]"), |
| dwarf_form_name (form), |
| bfd_get_filename (abfd)); |
| } |
| |
| /* Super hack. */ |
| if (cu->per_cu->is_dwz && attr_form_is_ref (attr)) |
| attr->form = DW_FORM_GNU_ref_alt; |
| |
| /* We have seen instances where the compiler tried to emit a byte |
| size attribute of -1 which ended up being encoded as an unsigned |
| 0xffffffff. Although 0xffffffff is technically a valid size value, |
| an object of this size seems pretty unlikely so we can relatively |
| safely treat these cases as if the size attribute was invalid and |
| treat them as zero by default. */ |
| if (attr->name == DW_AT_byte_size |
| && form == DW_FORM_data4 |
| && DW_UNSND (attr) >= 0xffffffff) |
| { |
| complaint |
| (&symfile_complaints, |
| _("Suspicious DW_AT_byte_size value treated as zero instead of %s"), |
| hex_string (DW_UNSND (attr))); |
| DW_UNSND (attr) = 0; |
| } |
| |
| return info_ptr; |
| } |
| |
| /* Read an attribute described by an abbreviated attribute. */ |
| |
| static const gdb_byte * |
| read_attribute (const struct die_reader_specs *reader, |
| struct attribute *attr, struct attr_abbrev *abbrev, |
| const gdb_byte *info_ptr) |
| { |
| attr->name = abbrev->name; |
| return read_attribute_value (reader, attr, abbrev->form, info_ptr); |
| } |
| |
| /* Read dwarf information from a buffer. */ |
| |
| static unsigned int |
| read_1_byte (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_8 (abfd, buf); |
| } |
| |
| static int |
| read_1_signed_byte (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_signed_8 (abfd, buf); |
| } |
| |
| static unsigned int |
| read_2_bytes (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_16 (abfd, buf); |
| } |
| |
| static int |
| read_2_signed_bytes (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_signed_16 (abfd, buf); |
| } |
| |
| static unsigned int |
| read_4_bytes (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_32 (abfd, buf); |
| } |
| |
| static int |
| read_4_signed_bytes (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_signed_32 (abfd, buf); |
| } |
| |
| static ULONGEST |
| read_8_bytes (bfd *abfd, const gdb_byte *buf) |
| { |
| return bfd_get_64 (abfd, buf); |
| } |
| |
| static CORE_ADDR |
| read_address (bfd *abfd, const gdb_byte *buf, struct dwarf2_cu *cu, |
| unsigned int *bytes_read) |
| { |
| struct comp_unit_head *cu_header = &cu->header; |
| CORE_ADDR retval = 0; |
| |
| if (cu_header->signed_addr_p) |
| { |
| switch (cu_header->addr_size) |
| { |
| case 2: |
| retval = bfd_get_signed_16 (abfd, buf); |
| break; |
| case 4: |
| retval = bfd_get_signed_32 (abfd, buf); |
| break; |
| case 8: |
| retval = bfd_get_signed_64 (abfd, buf); |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, |
| _("read_address: bad switch, signed [in module %s]"), |
| bfd_get_filename (abfd)); |
| } |
| } |
| else |
| { |
| switch (cu_header->addr_size) |
| { |
| case 2: |
| retval = bfd_get_16 (abfd, buf); |
| break; |
| case 4: |
| retval = bfd_get_32 (abfd, buf); |
| break; |
| case 8: |
| retval = bfd_get_64 (abfd, buf); |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, |
| _("read_address: bad switch, " |
| "unsigned [in module %s]"), |
| bfd_get_filename (abfd)); |
| } |
| } |
| |
| *bytes_read = cu_header->addr_size; |
| return retval; |
| } |
| |
| /* Read the initial length from a section. The (draft) DWARF 3 |
| specification allows the initial length to take up either 4 bytes |
| or 12 bytes. If the first 4 bytes are 0xffffffff, then the next 8 |
| bytes describe the length and all offsets will be 8 bytes in length |
| instead of 4. |
| |
| An older, non-standard 64-bit format is also handled by this |
| function. The older format in question stores the initial length |
| as an 8-byte quantity without an escape value. Lengths greater |
| than 2^32 aren't very common which means that the initial 4 bytes |
| is almost always zero. Since a length value of zero doesn't make |
| sense for the 32-bit format, this initial zero can be considered to |
| be an escape value which indicates the presence of the older 64-bit |
| format. As written, the code can't detect (old format) lengths |
| greater than 4GB. If it becomes necessary to handle lengths |
| somewhat larger than 4GB, we could allow other small values (such |
| as the non-sensical values of 1, 2, and 3) to also be used as |
| escape values indicating the presence of the old format. |
| |
| The value returned via bytes_read should be used to increment the |
| relevant pointer after calling read_initial_length(). |
| |
| [ Note: read_initial_length() and read_offset() are based on the |
| document entitled "DWARF Debugging Information Format", revision |
| 3, draft 8, dated November 19, 2001. This document was obtained |
| from: |
| |
| http://reality.sgiweb.org/davea/dwarf3-draft8-011125.pdf |
| |
| This document is only a draft and is subject to change. (So beware.) |
| |
| Details regarding the older, non-standard 64-bit format were |
| determined empirically by examining 64-bit ELF files produced by |
| the SGI toolchain on an IRIX 6.5 machine. |
| |
| - Kevin, July 16, 2002 |
| ] */ |
| |
| static LONGEST |
| read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read) |
| { |
| LONGEST length = bfd_get_32 (abfd, buf); |
| |
| if (length == 0xffffffff) |
| { |
| length = bfd_get_64 (abfd, buf + 4); |
| *bytes_read = 12; |
| } |
| else if (length == 0) |
| { |
| /* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */ |
| length = bfd_get_64 (abfd, buf); |
| *bytes_read = 8; |
| } |
| else |
| { |
| *bytes_read = 4; |
| } |
| |
| return length; |
| } |
| |
| /* Cover function for read_initial_length. |
| Returns the length of the object at BUF, and stores the size of the |
| initial length in *BYTES_READ and stores the size that offsets will be in |
| *OFFSET_SIZE. |
| If the initial length size is not equivalent to that specified in |
| CU_HEADER then issue a complaint. |
| This is useful when reading non-comp-unit headers. */ |
| |
| static LONGEST |
| read_checked_initial_length_and_offset (bfd *abfd, const gdb_byte *buf, |
| const struct comp_unit_head *cu_header, |
| unsigned int *bytes_read, |
| unsigned int *offset_size) |
| { |
| LONGEST length = read_initial_length (abfd, buf, bytes_read); |
| |
| gdb_assert (cu_header->initial_length_size == 4 |
| || cu_header->initial_length_size == 8 |
| || cu_header->initial_length_size == 12); |
| |
| if (cu_header->initial_length_size != *bytes_read) |
| complaint (&symfile_complaints, |
| _("intermixed 32-bit and 64-bit DWARF sections")); |
| |
| *offset_size = (*bytes_read == 4) ? 4 : 8; |
| return length; |
| } |
| |
| /* Read an offset from the data stream. The size of the offset is |
| given by cu_header->offset_size. */ |
| |
| static LONGEST |
| read_offset (bfd *abfd, const gdb_byte *buf, |
| const struct comp_unit_head *cu_header, |
| unsigned int *bytes_read) |
| { |
| LONGEST offset = read_offset_1 (abfd, buf, cu_header->offset_size); |
| |
| *bytes_read = cu_header->offset_size; |
| return offset; |
| } |
| |
| /* Read an offset from the data stream. */ |
| |
| static LONGEST |
| read_offset_1 (bfd *abfd, const gdb_byte *buf, unsigned int offset_size) |
| { |
| LONGEST retval = 0; |
| |
| switch (offset_size) |
| { |
| case 4: |
| retval = bfd_get_32 (abfd, buf); |
| break; |
| case 8: |
| retval = bfd_get_64 (abfd, buf); |
| break; |
| default: |
| internal_error (__FILE__, __LINE__, |
| _("read_offset_1: bad switch [in module %s]"), |
| bfd_get_filename (abfd)); |
| } |
| |
| return retval; |
| } |
| |
| static const gdb_byte * |
| read_n_bytes (bfd *abfd, const gdb_byte *buf, unsigned int size) |
| { |
| /* If the size of a host char is 8 bits, we can return a pointer |
| to the buffer, otherwise we have to copy the data to a buffer |
| allocated on the temporary obstack. */ |
| gdb_assert (HOST_CHAR_BIT == 8); |
| return buf; |
| } |
| |
| static const char * |
| read_direct_string (bfd *abfd, const gdb_byte *buf, |
| unsigned int *bytes_read_ptr) |
| { |
| /* If the size of a host char is 8 bits, we can return a pointer |
| to the string, otherwise we have to copy the string to a buffer |
| allocated on the temporary obstack. */ |
| gdb_assert (HOST_CHAR_BIT == 8); |
| if (*buf == '\0') |
| { |
| *bytes_read_ptr = 1; |
| return NULL; |
| } |
| *bytes_read_ptr = strlen ((const char *) buf) + 1; |
| return (const char *) buf; |
| } |
| |
| static const char * |
| read_indirect_string_at_offset (bfd *abfd, LONGEST str_offset) |
| { |
| dwarf2_read_section (dwarf2_per_objfile->objfile, &dwarf2_per_objfile->str); |
| if (dwarf2_per_objfile->str.buffer == NULL) |
| error (_("DW_FORM_strp used without .debug_str section [in module %s]"), |
| bfd_get_filename (abfd)); |
| if (str_offset >= dwarf2_per_objfile->str.size) |
| error (_("DW_FORM_strp pointing outside of " |
| ".debug_str section [in module %s]"), |
| bfd_get_filename (abfd)); |
| gdb_assert (HOST_CHAR_BIT == 8); |
| if (dwarf2_per_objfile->str.buffer[str_offset] == '\0') |
| return NULL; |
| return (const char *) (dwarf2_per_objfile->str.buffer + str_offset); |
| } |
| |
| /* Read a string at offset STR_OFFSET in the .debug_str section from |
| the .dwz file DWZ. Throw an error if the offset is too large. If |
| the string consists of a single NUL byte, return NULL; otherwise |
| return a pointer to the string. */ |
| |
| static const char * |
| read_indirect_string_from_dwz (struct dwz_file *dwz, LONGEST str_offset) |
| { |
| dwarf2_read_section (dwarf2_per_objfile->objfile, &dwz->str); |
| |
| if (dwz->str.buffer == NULL) |
| error (_("DW_FORM_GNU_strp_alt used without .debug_str " |
| "section [in module %s]"), |
| bfd_get_filename (dwz->dwz_bfd)); |
| if (str_offset >= dwz->str.size) |
| error (_("DW_FORM_GNU_strp_alt pointing outside of " |
| ".debug_str section [in module %s]"), |
| bfd_get_filename (dwz->dwz_bfd)); |
| gdb_assert (HOST_CHAR_BIT == 8); |
| if (dwz->str.buffer[str_offset] == '\0') |
| return NULL; |
| return (const char *) (dwz->str.buffer + str_offset); |
| } |
| |
| static const char * |
| read_indirect_string (bfd *abfd, const gdb_byte *buf, |
| const struct comp_unit_head *cu_header, |
| unsigned int *bytes_read_ptr) |
| { |
| LONGEST str_offset = read_offset (abfd, buf, cu_header, bytes_read_ptr); |
| |
| return read_indirect_string_at_offset (abfd, str_offset); |
| } |
| |
| static ULONGEST |
| read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf, |
| unsigned int *bytes_read_ptr) |
| { |
| ULONGEST result; |
| unsigned int num_read; |
| int shift; |
| unsigned char byte; |
| |
| result = 0; |
| shift = 0; |
| num_read = 0; |
| while (1) |
| { |
| byte = bfd_get_8 (abfd, buf); |
| buf++; |
| num_read++; |
| result |= ((ULONGEST) (byte & 127) << shift); |
| if ((byte & 128) == 0) |
| { |
| break; |
| } |
| shift += 7; |
| } |
| *bytes_read_ptr = num_read; |
| return result; |
| } |
| |
| static LONGEST |
| read_signed_leb128 (bfd *abfd, const gdb_byte *buf, |
| unsigned int *bytes_read_ptr) |
| { |
| LONGEST result; |
| int shift, num_read; |
| unsigned char byte; |
| |
| result = 0; |
| shift = 0; |
| num_read = 0; |
| while (1) |
| { |
| byte = bfd_get_8 (abfd, buf); |
| buf++; |
| num_read++; |
| result |= ((LONGEST) (byte & 127) << shift); |
| shift += 7; |
| if ((byte & 128) == 0) |
| { |
| break; |
| } |
| } |
| if ((shift < 8 * sizeof (result)) && (byte & 0x40)) |
| result |= -(((LONGEST) 1) << shift); |
| *bytes_read_ptr = num_read; |
| return result; |
| } |
| |
| /* Given index ADDR_INDEX in .debug_addr, fetch the value. |
| ADDR_BASE is the DW_AT_GNU_addr_base attribute or zero. |
| ADDR_SIZE is the size of addresses from the CU header. */ |
| |
| static CORE_ADDR |
| read_addr_index_1 (unsigned int addr_index, ULONGEST addr_base, int addr_size) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| bfd *abfd = objfile->obfd; |
| const gdb_byte *info_ptr; |
| |
| dwarf2_read_section (objfile, &dwarf2_per_objfile->addr); |
| if (dwarf2_per_objfile->addr.buffer == NULL) |
| error (_("DW_FORM_addr_index used without .debug_addr section [in module %s]"), |
| objfile_name (objfile)); |
| if (addr_base + addr_index * addr_size >= dwarf2_per_objfile->addr.size) |
| error (_("DW_FORM_addr_index pointing outside of " |
| ".debug_addr section [in module %s]"), |
| objfile_name (objfile)); |
| info_ptr = (dwarf2_per_objfile->addr.buffer |
| + addr_base + addr_index * addr_size); |
| if (addr_size == 4) |
| return bfd_get_32 (abfd, info_ptr); |
| else |
| return bfd_get_64 (abfd, info_ptr); |
| } |
| |
| /* Given index ADDR_INDEX in .debug_addr, fetch the value. */ |
| |
| static CORE_ADDR |
| read_addr_index (struct dwarf2_cu *cu, unsigned int addr_index) |
| { |
| return read_addr_index_1 (addr_index, cu->addr_base, cu->header.addr_size); |
| } |
| |
| /* Given a pointer to an leb128 value, fetch the value from .debug_addr. */ |
| |
| static CORE_ADDR |
| read_addr_index_from_leb128 (struct dwarf2_cu *cu, const gdb_byte *info_ptr, |
| unsigned int *bytes_read) |
| { |
| bfd *abfd = cu->objfile->obfd; |
| unsigned int addr_index = read_unsigned_leb128 (abfd, info_ptr, bytes_read); |
| |
| return read_addr_index (cu, addr_index); |
| } |
| |
| /* Data structure to pass results from dwarf2_read_addr_index_reader |
| back to dwarf2_read_addr_index. */ |
| |
| struct dwarf2_read_addr_index_data |
| { |
| ULONGEST addr_base; |
| int addr_size; |
| }; |
| |
| /* die_reader_func for dwarf2_read_addr_index. */ |
| |
| static void |
| dwarf2_read_addr_index_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| struct dwarf2_read_addr_index_data *aidata = |
| (struct dwarf2_read_addr_index_data *) data; |
| |
| aidata->addr_base = cu->addr_base; |
| aidata->addr_size = cu->header.addr_size; |
| } |
| |
| /* Given an index in .debug_addr, fetch the value. |
| NOTE: This can be called during dwarf expression evaluation, |
| long after the debug information has been read, and thus per_cu->cu |
| may no longer exist. */ |
| |
| CORE_ADDR |
| dwarf2_read_addr_index (struct dwarf2_per_cu_data *per_cu, |
| unsigned int addr_index) |
| { |
| struct objfile *objfile = per_cu->objfile; |
| struct dwarf2_cu *cu = per_cu->cu; |
| ULONGEST addr_base; |
| int addr_size; |
| |
| /* This is intended to be called from outside this file. */ |
| dw2_setup (objfile); |
| |
| /* We need addr_base and addr_size. |
| If we don't have PER_CU->cu, we have to get it. |
| Nasty, but the alternative is storing the needed info in PER_CU, |
| which at this point doesn't seem justified: it's not clear how frequently |
| it would get used and it would increase the size of every PER_CU. |
| Entry points like dwarf2_per_cu_addr_size do a similar thing |
| so we're not in uncharted territory here. |
| Alas we need to be a bit more complicated as addr_base is contained |
| in the DIE. |
| |
| We don't need to read the entire CU(/TU). |
| We just need the header and top level die. |
| |
| IWBN to use the aging mechanism to let us lazily later discard the CU. |
| For now we skip this optimization. */ |
| |
| if (cu != NULL) |
| { |
| addr_base = cu->addr_base; |
| addr_size = cu->header.addr_size; |
| } |
| else |
| { |
| struct dwarf2_read_addr_index_data aidata; |
| |
| /* Note: We can't use init_cutu_and_read_dies_simple here, |
| we need addr_base. */ |
| init_cutu_and_read_dies (per_cu, NULL, 0, 0, |
| dwarf2_read_addr_index_reader, &aidata); |
| addr_base = aidata.addr_base; |
| addr_size = aidata.addr_size; |
| } |
| |
| return read_addr_index_1 (addr_index, addr_base, addr_size); |
| } |
| |
| /* Given a DW_FORM_GNU_str_index, fetch the string. |
| This is only used by the Fission support. */ |
| |
| static const char * |
| read_str_index (const struct die_reader_specs *reader, ULONGEST str_index) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| const char *objf_name = objfile_name (objfile); |
| bfd *abfd = objfile->obfd; |
| struct dwarf2_cu *cu = reader->cu; |
| struct dwarf2_section_info *str_section = &reader->dwo_file->sections.str; |
| struct dwarf2_section_info *str_offsets_section = |
| &reader->dwo_file->sections.str_offsets; |
| const gdb_byte *info_ptr; |
| ULONGEST str_offset; |
| static const char form_name[] = "DW_FORM_GNU_str_index"; |
| |
| dwarf2_read_section (objfile, str_section); |
| dwarf2_read_section (objfile, str_offsets_section); |
| if (str_section->buffer == NULL) |
| error (_("%s used without .debug_str.dwo section" |
| " in CU at offset 0x%lx [in module %s]"), |
| form_name, (long) cu->header.offset.sect_off, objf_name); |
| if (str_offsets_section->buffer == NULL) |
| error (_("%s used without .debug_str_offsets.dwo section" |
| " in CU at offset 0x%lx [in module %s]"), |
| form_name, (long) cu->header.offset.sect_off, objf_name); |
| if (str_index * cu->header.offset_size >= str_offsets_section->size) |
| error (_("%s pointing outside of .debug_str_offsets.dwo" |
| " section in CU at offset 0x%lx [in module %s]"), |
| form_name, (long) cu->header.offset.sect_off, objf_name); |
| info_ptr = (str_offsets_section->buffer |
| + str_index * cu->header.offset_size); |
| if (cu->header.offset_size == 4) |
| str_offset = bfd_get_32 (abfd, info_ptr); |
| else |
| str_offset = bfd_get_64 (abfd, info_ptr); |
| if (str_offset >= str_section->size) |
| error (_("Offset from %s pointing outside of" |
| " .debug_str.dwo section in CU at offset 0x%lx [in module %s]"), |
| form_name, (long) cu->header.offset.sect_off, objf_name); |
| return (const char *) (str_section->buffer + str_offset); |
| } |
| |
| /* Return the length of an LEB128 number in BUF. */ |
| |
| static int |
| leb128_size (const gdb_byte *buf) |
| { |
| const gdb_byte *begin = buf; |
| gdb_byte byte; |
| |
| while (1) |
| { |
| byte = *buf++; |
| if ((byte & 128) == 0) |
| return buf - begin; |
| } |
| } |
| |
| static void |
| set_cu_language (unsigned int lang, struct dwarf2_cu *cu) |
| { |
| switch (lang) |
| { |
| case DW_LANG_C89: |
| case DW_LANG_C99: |
| case DW_LANG_C11: |
| case DW_LANG_C: |
| case DW_LANG_UPC: |
| cu->language = language_c; |
| break; |
| case DW_LANG_Java: |
| case DW_LANG_C_plus_plus: |
| case DW_LANG_C_plus_plus_11: |
| case DW_LANG_C_plus_plus_14: |
| cu->language = language_cplus; |
| break; |
| case DW_LANG_D: |
| cu->language = language_d; |
| break; |
| case DW_LANG_Fortran77: |
| case DW_LANG_Fortran90: |
| case DW_LANG_Fortran95: |
| case DW_LANG_Fortran03: |
| case DW_LANG_Fortran08: |
| cu->language = language_fortran; |
| break; |
| case DW_LANG_Go: |
| cu->language = language_go; |
| break; |
| case DW_LANG_Mips_Assembler: |
| cu->language = language_asm; |
| break; |
| case DW_LANG_Ada83: |
| case DW_LANG_Ada95: |
| cu->language = language_ada; |
| break; |
| case DW_LANG_Modula2: |
| cu->language = language_m2; |
| break; |
| case DW_LANG_Pascal83: |
| cu->language = language_pascal; |
| break; |
| case DW_LANG_ObjC: |
| cu->language = language_objc; |
| break; |
| case DW_LANG_Rust: |
| case DW_LANG_Rust_old: |
| cu->language = language_rust; |
| break; |
| case DW_LANG_Cobol74: |
| case DW_LANG_Cobol85: |
| default: |
| cu->language = language_minimal; |
| break; |
| } |
| cu->language_defn = language_def (cu->language); |
| } |
| |
| /* Return the named attribute or NULL if not there. */ |
| |
| static struct attribute * |
| dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) |
| { |
| for (;;) |
| { |
| unsigned int i; |
| struct attribute *spec = NULL; |
| |
| for (i = 0; i < die->num_attrs; ++i) |
| { |
| if (die->attrs[i].name == name) |
| return &die->attrs[i]; |
| if (die->attrs[i].name == DW_AT_specification |
| || die->attrs[i].name == DW_AT_abstract_origin) |
| spec = &die->attrs[i]; |
| } |
| |
| if (!spec) |
| break; |
| |
| die = follow_die_ref (die, spec, &cu); |
| } |
| |
| return NULL; |
| } |
| |
| /* Return the named attribute or NULL if not there, |
| but do not follow DW_AT_specification, etc. |
| This is for use in contexts where we're reading .debug_types dies. |
| Following DW_AT_specification, DW_AT_abstract_origin will take us |
| back up the chain, and we want to go down. */ |
| |
| static struct attribute * |
| dwarf2_attr_no_follow (struct die_info *die, unsigned int name) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < die->num_attrs; ++i) |
| if (die->attrs[i].name == name) |
| return &die->attrs[i]; |
| |
| return NULL; |
| } |
| |
| /* Return the string associated with a string-typed attribute, or NULL if it |
| is either not found or is of an incorrect type. */ |
| |
| static const char * |
| dwarf2_string_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| const char *str = NULL; |
| |
| attr = dwarf2_attr (die, name, cu); |
| |
| if (attr != NULL) |
| { |
| if (attr->form == DW_FORM_strp || attr->form == DW_FORM_string |
| || attr->form == DW_FORM_GNU_strp_alt) |
| str = DW_STRING (attr); |
| else |
| complaint (&symfile_complaints, |
| _("string type expected for attribute %s for " |
| "DIE at 0x%x in module %s"), |
| dwarf_attr_name (name), die->offset.sect_off, |
| objfile_name (cu->objfile)); |
| } |
| |
| return str; |
| } |
| |
| /* Return non-zero iff the attribute NAME is defined for the given DIE, |
| and holds a non-zero value. This function should only be used for |
| DW_FORM_flag or DW_FORM_flag_present attributes. */ |
| |
| static int |
| dwarf2_flag_true_p (struct die_info *die, unsigned name, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr = dwarf2_attr (die, name, cu); |
| |
| return (attr && DW_UNSND (attr)); |
| } |
| |
| static int |
| die_is_declaration (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| /* A DIE is a declaration if it has a DW_AT_declaration attribute |
| which value is non-zero. However, we have to be careful with |
| DIEs having a DW_AT_specification attribute, because dwarf2_attr() |
| (via dwarf2_flag_true_p) follows this attribute. So we may |
| end up accidently finding a declaration attribute that belongs |
| to a different DIE referenced by the specification attribute, |
| even though the given DIE does not have a declaration attribute. */ |
| return (dwarf2_flag_true_p (die, DW_AT_declaration, cu) |
| && dwarf2_attr (die, DW_AT_specification, cu) == NULL); |
| } |
| |
| /* Return the die giving the specification for DIE, if there is |
| one. *SPEC_CU is the CU containing DIE on input, and the CU |
| containing the return value on output. If there is no |
| specification, but there is an abstract origin, that is |
| returned. */ |
| |
| static struct die_info * |
| die_specification (struct die_info *die, struct dwarf2_cu **spec_cu) |
| { |
| struct attribute *spec_attr = dwarf2_attr (die, DW_AT_specification, |
| *spec_cu); |
| |
| if (spec_attr == NULL) |
| spec_attr = dwarf2_attr (die, DW_AT_abstract_origin, *spec_cu); |
| |
| if (spec_attr == NULL) |
| return NULL; |
| else |
| return follow_die_ref (die, spec_attr, spec_cu); |
| } |
| |
| /* Free the line_header structure *LH, and any arrays and strings it |
| refers to. |
| NOTE: This is also used as a "cleanup" function. */ |
| |
| static void |
| free_line_header (struct line_header *lh) |
| { |
| if (lh->standard_opcode_lengths) |
| xfree (lh->standard_opcode_lengths); |
| |
| /* Remember that all the lh->file_names[i].name pointers are |
| pointers into debug_line_buffer, and don't need to be freed. */ |
| if (lh->file_names) |
| xfree (lh->file_names); |
| |
| /* Similarly for the include directory names. */ |
| if (lh->include_dirs) |
| xfree (lh->include_dirs); |
| |
| xfree (lh); |
| } |
| |
| /* Stub for free_line_header to match void * callback types. */ |
| |
| static void |
| free_line_header_voidp (void *arg) |
| { |
| struct line_header *lh = (struct line_header *) arg; |
| |
| free_line_header (lh); |
| } |
| |
| /* Add an entry to LH's include directory table. */ |
| |
| static void |
| add_include_dir (struct line_header *lh, const char *include_dir) |
| { |
| if (dwarf_line_debug >= 2) |
| fprintf_unfiltered (gdb_stdlog, "Adding dir %u: %s\n", |
| lh->num_include_dirs + 1, include_dir); |
| |
| /* Grow the array if necessary. */ |
| if (lh->include_dirs_size == 0) |
| { |
| lh->include_dirs_size = 1; /* for testing */ |
| lh->include_dirs = XNEWVEC (const char *, lh->include_dirs_size); |
| } |
| else if (lh->num_include_dirs >= lh->include_dirs_size) |
| { |
| lh->include_dirs_size *= 2; |
| lh->include_dirs = XRESIZEVEC (const char *, lh->include_dirs, |
| lh->include_dirs_size); |
| } |
| |
| lh->include_dirs[lh->num_include_dirs++] = include_dir; |
| } |
| |
| /* Add an entry to LH's file name table. */ |
| |
| static void |
| add_file_name (struct line_header *lh, |
| const char *name, |
| unsigned int dir_index, |
| unsigned int mod_time, |
| unsigned int length) |
| { |
| struct file_entry *fe; |
| |
| if (dwarf_line_debug >= 2) |
| fprintf_unfiltered (gdb_stdlog, "Adding file %u: %s\n", |
| lh->num_file_names + 1, name); |
| |
| /* Grow the array if necessary. */ |
| if (lh->file_names_size == 0) |
| { |
| lh->file_names_size = 1; /* for testing */ |
| lh->file_names = XNEWVEC (struct file_entry, lh->file_names_size); |
| } |
| else if (lh->num_file_names >= lh->file_names_size) |
| { |
| lh->file_names_size *= 2; |
| lh->file_names |
| = XRESIZEVEC (struct file_entry, lh->file_names, lh->file_names_size); |
| } |
| |
| fe = &lh->file_names[lh->num_file_names++]; |
| fe->name = name; |
| fe->dir_index = dir_index; |
| fe->mod_time = mod_time; |
| fe->length = length; |
| fe->included_p = 0; |
| fe->symtab = NULL; |
| } |
| |
| /* A convenience function to find the proper .debug_line section for a CU. */ |
| |
| static struct dwarf2_section_info * |
| get_debug_line_section (struct dwarf2_cu *cu) |
| { |
| struct dwarf2_section_info *section; |
| |
| /* For TUs in DWO files, the DW_AT_stmt_list attribute lives in the |
| DWO file. */ |
| if (cu->dwo_unit && cu->per_cu->is_debug_types) |
| section = &cu->dwo_unit->dwo_file->sections.line; |
| else if (cu->per_cu->is_dwz) |
| { |
| struct dwz_file *dwz = dwarf2_get_dwz_file (); |
| |
| section = &dwz->line; |
| } |
| else |
| section = &dwarf2_per_objfile->line; |
| |
| return section; |
| } |
| |
| /* Read the statement program header starting at OFFSET in |
| .debug_line, or .debug_line.dwo. Return a pointer |
| to a struct line_header, allocated using xmalloc. |
| Returns NULL if there is a problem reading the header, e.g., if it |
| has a version we don't understand. |
| |
| NOTE: the strings in the include directory and file name tables of |
| the returned object point into the dwarf line section buffer, |
| and must not be freed. */ |
| |
| static struct line_header * |
| dwarf_decode_line_header (unsigned int offset, struct dwarf2_cu *cu) |
| { |
| struct cleanup *back_to; |
| struct line_header *lh; |
| const gdb_byte *line_ptr; |
| unsigned int bytes_read, offset_size; |
| int i; |
| const char *cur_dir, *cur_file; |
| struct dwarf2_section_info *section; |
| bfd *abfd; |
| |
| section = get_debug_line_section (cu); |
| dwarf2_read_section (dwarf2_per_objfile->objfile, section); |
| if (section->buffer == NULL) |
| { |
| if (cu->dwo_unit && cu->per_cu->is_debug_types) |
| complaint (&symfile_complaints, _("missing .debug_line.dwo section")); |
| else |
| complaint (&symfile_complaints, _("missing .debug_line section")); |
| return 0; |
| } |
| |
| /* We can't do this until we know the section is non-empty. |
| Only then do we know we have such a section. */ |
| abfd = get_section_bfd_owner (section); |
| |
| /* Make sure that at least there's room for the total_length field. |
| That could be 12 bytes long, but we're just going to fudge that. */ |
| if (offset + 4 >= section->size) |
| { |
| dwarf2_statement_list_fits_in_line_number_section_complaint (); |
| return 0; |
| } |
| |
| lh = XNEW (struct line_header); |
| memset (lh, 0, sizeof (*lh)); |
| back_to = make_cleanup ((make_cleanup_ftype *) free_line_header, |
| (void *) lh); |
| |
| lh->offset.sect_off = offset; |
| lh->offset_in_dwz = cu->per_cu->is_dwz; |
| |
| line_ptr = section->buffer + offset; |
| |
| /* Read in the header. */ |
| lh->total_length = |
| read_checked_initial_length_and_offset (abfd, line_ptr, &cu->header, |
| &bytes_read, &offset_size); |
| line_ptr += bytes_read; |
| if (line_ptr + lh->total_length > (section->buffer + section->size)) |
| { |
| dwarf2_statement_list_fits_in_line_number_section_complaint (); |
| do_cleanups (back_to); |
| return 0; |
| } |
| lh->statement_program_end = line_ptr + lh->total_length; |
| lh->version = read_2_bytes (abfd, line_ptr); |
| line_ptr += 2; |
| if (lh->version > 4) |
| { |
| /* This is a version we don't understand. The format could have |
| changed in ways we don't handle properly so just punt. */ |
| complaint (&symfile_complaints, |
| _("unsupported version in .debug_line section")); |
| return NULL; |
| } |
| lh->header_length = read_offset_1 (abfd, line_ptr, offset_size); |
| line_ptr += offset_size; |
| lh->minimum_instruction_length = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| if (lh->version >= 4) |
| { |
| lh->maximum_ops_per_instruction = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| } |
| else |
| lh->maximum_ops_per_instruction = 1; |
| |
| if (lh->maximum_ops_per_instruction == 0) |
| { |
| lh->maximum_ops_per_instruction = 1; |
| complaint (&symfile_complaints, |
| _("invalid maximum_ops_per_instruction " |
| "in `.debug_line' section")); |
| } |
| |
| lh->default_is_stmt = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| lh->line_base = read_1_signed_byte (abfd, line_ptr); |
| line_ptr += 1; |
| lh->line_range = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| lh->opcode_base = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| lh->standard_opcode_lengths = XNEWVEC (unsigned char, lh->opcode_base); |
| |
| lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */ |
| for (i = 1; i < lh->opcode_base; ++i) |
| { |
| lh->standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| } |
| |
| /* Read directory table. */ |
| while ((cur_dir = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL) |
| { |
| line_ptr += bytes_read; |
| add_include_dir (lh, cur_dir); |
| } |
| line_ptr += bytes_read; |
| |
| /* Read file name table. */ |
| while ((cur_file = read_direct_string (abfd, line_ptr, &bytes_read)) != NULL) |
| { |
| unsigned int dir_index, mod_time, length; |
| |
| line_ptr += bytes_read; |
| dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| |
| add_file_name (lh, cur_file, dir_index, mod_time, length); |
| } |
| line_ptr += bytes_read; |
| lh->statement_program_start = line_ptr; |
| |
| if (line_ptr > (section->buffer + section->size)) |
| complaint (&symfile_complaints, |
| _("line number info header doesn't " |
| "fit in `.debug_line' section")); |
| |
| discard_cleanups (back_to); |
| return lh; |
| } |
| |
| /* Subroutine of dwarf_decode_lines to simplify it. |
| Return the file name of the psymtab for included file FILE_INDEX |
| in line header LH of PST. |
| COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. |
| If space for the result is malloc'd, it will be freed by a cleanup. |
| Returns NULL if FILE_INDEX should be ignored, i.e., it is pst->filename. |
| |
| The function creates dangling cleanup registration. */ |
| |
| static const char * |
| psymtab_include_file_name (const struct line_header *lh, int file_index, |
| const struct partial_symtab *pst, |
| const char *comp_dir) |
| { |
| const struct file_entry fe = lh->file_names [file_index]; |
| const char *include_name = fe.name; |
| const char *include_name_to_compare = include_name; |
| const char *dir_name = NULL; |
| const char *pst_filename; |
| char *copied_name = NULL; |
| int file_is_pst; |
| |
| if (fe.dir_index && lh->include_dirs != NULL) |
| dir_name = lh->include_dirs[fe.dir_index - 1]; |
| |
| if (!IS_ABSOLUTE_PATH (include_name) |
| && (dir_name != NULL || comp_dir != NULL)) |
| { |
| /* Avoid creating a duplicate psymtab for PST. |
| We do this by comparing INCLUDE_NAME and PST_FILENAME. |
| Before we do the comparison, however, we need to account |
| for DIR_NAME and COMP_DIR. |
| First prepend dir_name (if non-NULL). If we still don't |
| have an absolute path prepend comp_dir (if non-NULL). |
| However, the directory we record in the include-file's |
| psymtab does not contain COMP_DIR (to match the |
| corresponding symtab(s)). |
| |
| Example: |
| |
| bash$ cd /tmp |
| bash$ gcc -g ./hello.c |
| include_name = "hello.c" |
| dir_name = "." |
| DW_AT_comp_dir = comp_dir = "/tmp" |
| DW_AT_name = "./hello.c" |
| |
| */ |
| |
| if (dir_name != NULL) |
| { |
| char *tem = concat (dir_name, SLASH_STRING, |
| include_name, (char *)NULL); |
| |
| make_cleanup (xfree, tem); |
| include_name = tem; |
| include_name_to_compare = include_name; |
| } |
| if (!IS_ABSOLUTE_PATH (include_name) && comp_dir != NULL) |
| { |
| char *tem = concat (comp_dir, SLASH_STRING, |
| include_name, (char *)NULL); |
| |
| make_cleanup (xfree, tem); |
| include_name_to_compare = tem; |
| } |
| } |
| |
| pst_filename = pst->filename; |
| if (!IS_ABSOLUTE_PATH (pst_filename) && pst->dirname != NULL) |
| { |
| copied_name = concat (pst->dirname, SLASH_STRING, |
| pst_filename, (char *)NULL); |
| pst_filename = copied_name; |
| } |
| |
| file_is_pst = FILENAME_CMP (include_name_to_compare, pst_filename) == 0; |
| |
| if (copied_name != NULL) |
| xfree (copied_name); |
| |
| if (file_is_pst) |
| return NULL; |
| return include_name; |
| } |
| |
| /* State machine to track the state of the line number program. */ |
| |
| typedef struct |
| { |
| /* These are part of the standard DWARF line number state machine. */ |
| |
| unsigned char op_index; |
| unsigned int file; |
| unsigned int line; |
| CORE_ADDR address; |
| int is_stmt; |
| unsigned int discriminator; |
| |
| /* Additional bits of state we need to track. */ |
| |
| /* The last file that we called dwarf2_start_subfile for. |
| This is only used for TLLs. */ |
| unsigned int last_file; |
| /* The last file a line number was recorded for. */ |
| struct subfile *last_subfile; |
| |
| /* The function to call to record a line. */ |
| record_line_ftype *record_line; |
| |
| /* The last line number that was recorded, used to coalesce |
| consecutive entries for the same line. This can happen, for |
| example, when discriminators are present. PR 17276. */ |
| unsigned int last_line; |
| int line_has_non_zero_discriminator; |
| } lnp_state_machine; |
| |
| /* There's a lot of static state to pass to dwarf_record_line. |
| This keeps it all together. */ |
| |
| typedef struct |
| { |
| /* The gdbarch. */ |
| struct gdbarch *gdbarch; |
| |
| /* The line number header. */ |
| struct line_header *line_header; |
| |
| /* Non-zero if we're recording lines. |
| Otherwise we're building partial symtabs and are just interested in |
| finding include files mentioned by the line number program. */ |
| int record_lines_p; |
| } lnp_reader_state; |
| |
| /* Ignore this record_line request. */ |
| |
| static void |
| noop_record_line (struct subfile *subfile, int line, CORE_ADDR pc) |
| { |
| return; |
| } |
| |
| /* Return non-zero if we should add LINE to the line number table. |
| LINE is the line to add, LAST_LINE is the last line that was added, |
| LAST_SUBFILE is the subfile for LAST_LINE. |
| LINE_HAS_NON_ZERO_DISCRIMINATOR is non-zero if LINE has ever |
| had a non-zero discriminator. |
| |
| We have to be careful in the presence of discriminators. |
| E.g., for this line: |
| |
| for (i = 0; i < 100000; i++); |
| |
| clang can emit four line number entries for that one line, |
| each with a different discriminator. |
| See gdb.dwarf2/dw2-single-line-discriminators.exp for an example. |
| |
| However, we want gdb to coalesce all four entries into one. |
| Otherwise the user could stepi into the middle of the line and |
| gdb would get confused about whether the pc really was in the |
| middle of the line. |
| |
| Things are further complicated by the fact that two consecutive |
| line number entries for the same line is a heuristic used by gcc |
| to denote the end of the prologue. So we can't just discard duplicate |
| entries, we have to be selective about it. The heuristic we use is |
| that we only collapse consecutive entries for the same line if at least |
| one of those entries has a non-zero discriminator. PR 17276. |
| |
| Note: Addresses in the line number state machine can never go backwards |
| within one sequence, thus this coalescing is ok. */ |
| |
| static int |
| dwarf_record_line_p (unsigned int line, unsigned int last_line, |
| int line_has_non_zero_discriminator, |
| struct subfile *last_subfile) |
| { |
| if (current_subfile != last_subfile) |
| return 1; |
| if (line != last_line) |
| return 1; |
| /* Same line for the same file that we've seen already. |
| As a last check, for pr 17276, only record the line if the line |
| has never had a non-zero discriminator. */ |
| if (!line_has_non_zero_discriminator) |
| return 1; |
| return 0; |
| } |
| |
| /* Use P_RECORD_LINE to record line number LINE beginning at address ADDRESS |
| in the line table of subfile SUBFILE. */ |
| |
| static void |
| dwarf_record_line_1 (struct gdbarch *gdbarch, struct subfile *subfile, |
| unsigned int line, CORE_ADDR address, |
| record_line_ftype p_record_line) |
| { |
| CORE_ADDR addr = gdbarch_addr_bits_remove (gdbarch, address); |
| |
| if (dwarf_line_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Recording line %u, file %s, address %s\n", |
| line, lbasename (subfile->name), |
| paddress (gdbarch, address)); |
| } |
| |
| (*p_record_line) (subfile, line, addr); |
| } |
| |
| /* Subroutine of dwarf_decode_lines_1 to simplify it. |
| Mark the end of a set of line number records. |
| The arguments are the same as for dwarf_record_line_1. |
| If SUBFILE is NULL the request is ignored. */ |
| |
| static void |
| dwarf_finish_line (struct gdbarch *gdbarch, struct subfile *subfile, |
| CORE_ADDR address, record_line_ftype p_record_line) |
| { |
| if (subfile == NULL) |
| return; |
| |
| if (dwarf_line_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Finishing current line, file %s, address %s\n", |
| lbasename (subfile->name), |
| paddress (gdbarch, address)); |
| } |
| |
| dwarf_record_line_1 (gdbarch, subfile, 0, address, p_record_line); |
| } |
| |
| /* Record the line in STATE. |
| END_SEQUENCE is non-zero if we're processing the end of a sequence. */ |
| |
| static void |
| dwarf_record_line (lnp_reader_state *reader, lnp_state_machine *state, |
| int end_sequence) |
| { |
| const struct line_header *lh = reader->line_header; |
| unsigned int file, line, discriminator; |
| int is_stmt; |
| |
| file = state->file; |
| line = state->line; |
| is_stmt = state->is_stmt; |
| discriminator = state->discriminator; |
| |
| if (dwarf_line_debug) |
| { |
| fprintf_unfiltered (gdb_stdlog, |
| "Processing actual line %u: file %u," |
| " address %s, is_stmt %u, discrim %u\n", |
| line, file, |
| paddress (reader->gdbarch, state->address), |
| is_stmt, discriminator); |
| } |
| |
| if (file == 0 || file - 1 >= lh->num_file_names) |
| dwarf2_debug_line_missing_file_complaint (); |
| /* For now we ignore lines not starting on an instruction boundary. |
| But not when processing end_sequence for compatibility with the |
| previous version of the code. */ |
| else if (state->op_index == 0 || end_sequence) |
| { |
| lh->file_names[file - 1].included_p = 1; |
| if (reader->record_lines_p && is_stmt) |
| { |
| if (state->last_subfile != current_subfile || end_sequence) |
| { |
| dwarf_finish_line (reader->gdbarch, state->last_subfile, |
| state->address, state->record_line); |
| } |
| |
| if (!end_sequence) |
| { |
| if (dwarf_record_line_p (line, state->last_line, |
| state->line_has_non_zero_discriminator, |
| state->last_subfile)) |
| { |
| dwarf_record_line_1 (reader->gdbarch, current_subfile, |
| line, state->address, |
| state->record_line); |
| } |
| state->last_subfile = current_subfile; |
| state->last_line = line; |
| } |
| } |
| } |
| } |
| |
| /* Initialize STATE for the start of a line number program. */ |
| |
| static void |
| init_lnp_state_machine (lnp_state_machine *state, |
| const lnp_reader_state *reader) |
| { |
| memset (state, 0, sizeof (*state)); |
| |
| /* Just starting, there is no "last file". */ |
| state->last_file = 0; |
| state->last_subfile = NULL; |
| |
| state->record_line = record_line; |
| |
| state->last_line = 0; |
| state->line_has_non_zero_discriminator = 0; |
| |
| /* Initialize these according to the DWARF spec. */ |
| state->op_index = 0; |
| state->file = 1; |
| state->line = 1; |
| /* Call `gdbarch_adjust_dwarf2_line' on the initial 0 address as if there |
| was a line entry for it so that the backend has a chance to adjust it |
| and also record it in case it needs it. This is currently used by MIPS |
| code, cf. `mips_adjust_dwarf2_line'. */ |
| state->address = gdbarch_adjust_dwarf2_line (reader->gdbarch, 0, 0); |
| state->is_stmt = reader->line_header->default_is_stmt; |
| state->discriminator = 0; |
| } |
| |
| /* Check address and if invalid nop-out the rest of the lines in this |
| sequence. */ |
| |
| static void |
| check_line_address (struct dwarf2_cu *cu, lnp_state_machine *state, |
| const gdb_byte *line_ptr, |
| CORE_ADDR lowpc, CORE_ADDR address) |
| { |
| /* If address < lowpc then it's not a usable value, it's outside the |
| pc range of the CU. However, we restrict the test to only address |
| values of zero to preserve GDB's previous behaviour which is to |
| handle the specific case of a function being GC'd by the linker. */ |
| |
| if (address == 0 && address < lowpc) |
| { |
| /* This line table is for a function which has been |
| GCd by the linker. Ignore it. PR gdb/12528 */ |
| |
| struct objfile *objfile = cu->objfile; |
| long line_offset = line_ptr - get_debug_line_section (cu)->buffer; |
| |
| complaint (&symfile_complaints, |
| _(".debug_line address at offset 0x%lx is 0 [in module %s]"), |
| line_offset, objfile_name (objfile)); |
| state->record_line = noop_record_line; |
| /* Note: sm.record_line is left as noop_record_line |
| until we see DW_LNE_end_sequence. */ |
| } |
| } |
| |
| /* Subroutine of dwarf_decode_lines to simplify it. |
| Process the line number information in LH. |
| If DECODE_FOR_PST_P is non-zero, all we do is process the line number |
| program in order to set included_p for every referenced header. */ |
| |
| static void |
| dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu, |
| const int decode_for_pst_p, CORE_ADDR lowpc) |
| { |
| const gdb_byte *line_ptr, *extended_end; |
| const gdb_byte *line_end; |
| unsigned int bytes_read, extended_len; |
| unsigned char op_code, extended_op; |
| CORE_ADDR baseaddr; |
| struct objfile *objfile = cu->objfile; |
| bfd *abfd = objfile->obfd; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| /* Non-zero if we're recording line info (as opposed to building partial |
| symtabs). */ |
| int record_lines_p = !decode_for_pst_p; |
| /* A collection of things we need to pass to dwarf_record_line. */ |
| lnp_reader_state reader_state; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| line_ptr = lh->statement_program_start; |
| line_end = lh->statement_program_end; |
| |
| reader_state.gdbarch = gdbarch; |
| reader_state.line_header = lh; |
| reader_state.record_lines_p = record_lines_p; |
| |
| /* Read the statement sequences until there's nothing left. */ |
| while (line_ptr < line_end) |
| { |
| /* The DWARF line number program state machine. */ |
| lnp_state_machine state_machine; |
| int end_sequence = 0; |
| |
| /* Reset the state machine at the start of each sequence. */ |
| init_lnp_state_machine (&state_machine, &reader_state); |
| |
| if (record_lines_p && lh->num_file_names >= state_machine.file) |
| { |
| /* Start a subfile for the current file of the state machine. */ |
| /* lh->include_dirs and lh->file_names are 0-based, but the |
| directory and file name numbers in the statement program |
| are 1-based. */ |
| struct file_entry *fe = &lh->file_names[state_machine.file - 1]; |
| const char *dir = NULL; |
| |
| if (fe->dir_index && lh->include_dirs != NULL) |
| dir = lh->include_dirs[fe->dir_index - 1]; |
| |
| dwarf2_start_subfile (fe->name, dir); |
| } |
| |
| /* Decode the table. */ |
| while (line_ptr < line_end && !end_sequence) |
| { |
| op_code = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| |
| if (op_code >= lh->opcode_base) |
| { |
| /* Special opcode. */ |
| unsigned char adj_opcode; |
| CORE_ADDR addr_adj; |
| int line_delta; |
| |
| adj_opcode = op_code - lh->opcode_base; |
| addr_adj = (((state_machine.op_index |
| + (adj_opcode / lh->line_range)) |
| / lh->maximum_ops_per_instruction) |
| * lh->minimum_instruction_length); |
| state_machine.address |
| += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1); |
| state_machine.op_index = ((state_machine.op_index |
| + (adj_opcode / lh->line_range)) |
| % lh->maximum_ops_per_instruction); |
| line_delta = lh->line_base + (adj_opcode % lh->line_range); |
| state_machine.line += line_delta; |
| if (line_delta != 0) |
| state_machine.line_has_non_zero_discriminator |
| = state_machine.discriminator != 0; |
| |
| dwarf_record_line (&reader_state, &state_machine, 0); |
| state_machine.discriminator = 0; |
| } |
| else switch (op_code) |
| { |
| case DW_LNS_extended_op: |
| extended_len = read_unsigned_leb128 (abfd, line_ptr, |
| &bytes_read); |
| line_ptr += bytes_read; |
| extended_end = line_ptr + extended_len; |
| extended_op = read_1_byte (abfd, line_ptr); |
| line_ptr += 1; |
| switch (extended_op) |
| { |
| case DW_LNE_end_sequence: |
| state_machine.record_line = record_line; |
| end_sequence = 1; |
| break; |
| case DW_LNE_set_address: |
| { |
| CORE_ADDR address |
| = read_address (abfd, line_ptr, cu, &bytes_read); |
| |
| line_ptr += bytes_read; |
| check_line_address (cu, &state_machine, line_ptr, |
| lowpc, address); |
| state_machine.op_index = 0; |
| address += baseaddr; |
| state_machine.address |
| = gdbarch_adjust_dwarf2_line (gdbarch, address, 0); |
| } |
| break; |
| case DW_LNE_define_file: |
| { |
| const char *cur_file; |
| unsigned int dir_index, mod_time, length; |
| |
| cur_file = read_direct_string (abfd, line_ptr, |
| &bytes_read); |
| line_ptr += bytes_read; |
| dir_index = |
| read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| mod_time = |
| read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| length = |
| read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| add_file_name (lh, cur_file, dir_index, mod_time, length); |
| } |
| break; |
| case DW_LNE_set_discriminator: |
| /* The discriminator is not interesting to the debugger; |
| just ignore it. We still need to check its value though: |
| if there are consecutive entries for the same |
| (non-prologue) line we want to coalesce them. |
| PR 17276. */ |
| state_machine.discriminator |
| = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| state_machine.line_has_non_zero_discriminator |
| |= state_machine.discriminator != 0; |
| line_ptr += bytes_read; |
| break; |
| default: |
| complaint (&symfile_complaints, |
| _("mangled .debug_line section")); |
| return; |
| } |
| /* Make sure that we parsed the extended op correctly. If e.g. |
| we expected a different address size than the producer used, |
| we may have read the wrong number of bytes. */ |
| if (line_ptr != extended_end) |
| { |
| complaint (&symfile_complaints, |
| _("mangled .debug_line section")); |
| return; |
| } |
| break; |
| case DW_LNS_copy: |
| dwarf_record_line (&reader_state, &state_machine, 0); |
| state_machine.discriminator = 0; |
| break; |
| case DW_LNS_advance_pc: |
| { |
| CORE_ADDR adjust |
| = read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| CORE_ADDR addr_adj; |
| |
| addr_adj = (((state_machine.op_index + adjust) |
| / lh->maximum_ops_per_instruction) |
| * lh->minimum_instruction_length); |
| state_machine.address |
| += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1); |
| state_machine.op_index = ((state_machine.op_index + adjust) |
| % lh->maximum_ops_per_instruction); |
| line_ptr += bytes_read; |
| } |
| break; |
| case DW_LNS_advance_line: |
| { |
| int line_delta |
| = read_signed_leb128 (abfd, line_ptr, &bytes_read); |
| |
| state_machine.line += line_delta; |
| if (line_delta != 0) |
| state_machine.line_has_non_zero_discriminator |
| = state_machine.discriminator != 0; |
| line_ptr += bytes_read; |
| } |
| break; |
| case DW_LNS_set_file: |
| { |
| /* The arrays lh->include_dirs and lh->file_names are |
| 0-based, but the directory and file name numbers in |
| the statement program are 1-based. */ |
| struct file_entry *fe; |
| const char *dir = NULL; |
| |
| state_machine.file = read_unsigned_leb128 (abfd, line_ptr, |
| &bytes_read); |
| line_ptr += bytes_read; |
| if (state_machine.file == 0 |
| || state_machine.file - 1 >= lh->num_file_names) |
| dwarf2_debug_line_missing_file_complaint (); |
| else |
| { |
| fe = &lh->file_names[state_machine.file - 1]; |
| if (fe->dir_index && lh->include_dirs != NULL) |
| dir = lh->include_dirs[fe->dir_index - 1]; |
| if (record_lines_p) |
| { |
| state_machine.last_subfile = current_subfile; |
| state_machine.line_has_non_zero_discriminator |
| = state_machine.discriminator != 0; |
| dwarf2_start_subfile (fe->name, dir); |
| } |
| } |
| } |
| break; |
| case DW_LNS_set_column: |
| (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| break; |
| case DW_LNS_negate_stmt: |
| state_machine.is_stmt = (!state_machine.is_stmt); |
| break; |
| case DW_LNS_set_basic_block: |
| break; |
| /* Add to the address register of the state machine the |
| address increment value corresponding to special opcode |
| 255. I.e., this value is scaled by the minimum |
| instruction length since special opcode 255 would have |
| scaled the increment. */ |
| case DW_LNS_const_add_pc: |
| { |
| CORE_ADDR adjust = (255 - lh->opcode_base) / lh->line_range; |
| CORE_ADDR addr_adj; |
| |
| addr_adj = (((state_machine.op_index + adjust) |
| / lh->maximum_ops_per_instruction) |
| * lh->minimum_instruction_length); |
| state_machine.address |
| += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1); |
| state_machine.op_index = ((state_machine.op_index + adjust) |
| % lh->maximum_ops_per_instruction); |
| } |
| break; |
| case DW_LNS_fixed_advance_pc: |
| { |
| CORE_ADDR addr_adj; |
| |
| addr_adj = read_2_bytes (abfd, line_ptr); |
| state_machine.address |
| += gdbarch_adjust_dwarf2_line (gdbarch, addr_adj, 1); |
| state_machine.op_index = 0; |
| line_ptr += 2; |
| } |
| break; |
| default: |
| { |
| /* Unknown standard opcode, ignore it. */ |
| int i; |
| |
| for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++) |
| { |
| (void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read); |
| line_ptr += bytes_read; |
| } |
| } |
| } |
| } |
| |
| if (!end_sequence) |
| dwarf2_debug_line_missing_end_sequence_complaint (); |
| |
| /* We got a DW_LNE_end_sequence (or we ran off the end of the buffer, |
| in which case we still finish recording the last line). */ |
| dwarf_record_line (&reader_state, &state_machine, 1); |
| } |
| } |
| |
| /* Decode the Line Number Program (LNP) for the given line_header |
| structure and CU. The actual information extracted and the type |
| of structures created from the LNP depends on the value of PST. |
| |
| 1. If PST is NULL, then this procedure uses the data from the program |
| to create all necessary symbol tables, and their linetables. |
| |
| 2. If PST is not NULL, this procedure reads the program to determine |
| the list of files included by the unit represented by PST, and |
| builds all the associated partial symbol tables. |
| |
| COMP_DIR is the compilation directory (DW_AT_comp_dir) or NULL if unknown. |
| It is used for relative paths in the line table. |
| NOTE: When processing partial symtabs (pst != NULL), |
| comp_dir == pst->dirname. |
| |
| NOTE: It is important that psymtabs have the same file name (via strcmp) |
| as the corresponding symtab. Since COMP_DIR is not used in the name of the |
| symtab we don't use it in the name of the psymtabs we create. |
| E.g. expand_line_sal requires this when finding psymtabs to expand. |
| A good testcase for this is mb-inline.exp. |
| |
| LOWPC is the lowest address in CU (or 0 if not known). |
| |
| Boolean DECODE_MAPPING specifies we need to fully decode .debug_line |
| for its PC<->lines mapping information. Otherwise only the filename |
| table is read in. */ |
| |
| static void |
| dwarf_decode_lines (struct line_header *lh, const char *comp_dir, |
| struct dwarf2_cu *cu, struct partial_symtab *pst, |
| CORE_ADDR lowpc, int decode_mapping) |
| { |
| struct objfile *objfile = cu->objfile; |
| const int decode_for_pst_p = (pst != NULL); |
| |
| if (decode_mapping) |
| dwarf_decode_lines_1 (lh, cu, decode_for_pst_p, lowpc); |
| |
| if (decode_for_pst_p) |
| { |
| int file_index; |
| |
| /* Now that we're done scanning the Line Header Program, we can |
| create the psymtab of each included file. */ |
| for (file_index = 0; file_index < lh->num_file_names; file_index++) |
| if (lh->file_names[file_index].included_p == 1) |
| { |
| const char *include_name = |
| psymtab_include_file_name (lh, file_index, pst, comp_dir); |
| if (include_name != NULL) |
| dwarf2_create_include_psymtab (include_name, pst, objfile); |
| } |
| } |
| else |
| { |
| /* Make sure a symtab is created for every file, even files |
| which contain only variables (i.e. no code with associated |
| line numbers). */ |
| struct compunit_symtab *cust = buildsym_compunit_symtab (); |
| int i; |
| |
| for (i = 0; i < lh->num_file_names; i++) |
| { |
| const char *dir = NULL; |
| struct file_entry *fe; |
| |
| fe = &lh->file_names[i]; |
| if (fe->dir_index && lh->include_dirs != NULL) |
| dir = lh->include_dirs[fe->dir_index - 1]; |
| dwarf2_start_subfile (fe->name, dir); |
| |
| if (current_subfile->symtab == NULL) |
| { |
| current_subfile->symtab |
| = allocate_symtab (cust, current_subfile->name); |
| } |
| fe->symtab = current_subfile->symtab; |
| } |
| } |
| } |
| |
| /* Start a subfile for DWARF. FILENAME is the name of the file and |
| DIRNAME the name of the source directory which contains FILENAME |
| or NULL if not known. |
| This routine tries to keep line numbers from identical absolute and |
| relative file names in a common subfile. |
| |
| Using the `list' example from the GDB testsuite, which resides in |
| /srcdir and compiling it with Irix6.2 cc in /compdir using a filename |
| of /srcdir/list0.c yields the following debugging information for list0.c: |
| |
| DW_AT_name: /srcdir/list0.c |
| DW_AT_comp_dir: /compdir |
| files.files[0].name: list0.h |
| files.files[0].dir: /srcdir |
| files.files[1].name: list0.c |
| files.files[1].dir: /srcdir |
| |
| The line number information for list0.c has to end up in a single |
| subfile, so that `break /srcdir/list0.c:1' works as expected. |
| start_subfile will ensure that this happens provided that we pass the |
| concatenation of files.files[1].dir and files.files[1].name as the |
| subfile's name. */ |
| |
| static void |
| dwarf2_start_subfile (const char *filename, const char *dirname) |
| { |
| char *copy = NULL; |
| |
| /* In order not to lose the line information directory, |
| we concatenate it to the filename when it makes sense. |
| Note that the Dwarf3 standard says (speaking of filenames in line |
| information): ``The directory index is ignored for file names |
| that represent full path names''. Thus ignoring dirname in the |
| `else' branch below isn't an issue. */ |
| |
| if (!IS_ABSOLUTE_PATH (filename) && dirname != NULL) |
| { |
| copy = concat (dirname, SLASH_STRING, filename, (char *)NULL); |
| filename = copy; |
| } |
| |
| start_subfile (filename); |
| |
| if (copy != NULL) |
| xfree (copy); |
| } |
| |
| /* Start a symtab for DWARF. |
| NAME, COMP_DIR, LOW_PC are passed to start_symtab. */ |
| |
| static struct compunit_symtab * |
| dwarf2_start_symtab (struct dwarf2_cu *cu, |
| const char *name, const char *comp_dir, CORE_ADDR low_pc) |
| { |
| struct compunit_symtab *cust |
| = start_symtab (cu->objfile, name, comp_dir, low_pc); |
| |
| record_debugformat ("DWARF 2"); |
| record_producer (cu->producer); |
| |
| /* We assume that we're processing GCC output. */ |
| processing_gcc_compilation = 2; |
| |
| cu->processing_has_namespace_info = 0; |
| |
| return cust; |
| } |
| |
| static void |
| var_decode_location (struct attribute *attr, struct symbol *sym, |
| struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct comp_unit_head *cu_header = &cu->header; |
| |
| /* NOTE drow/2003-01-30: There used to be a comment and some special |
| code here to turn a symbol with DW_AT_external and a |
| SYMBOL_VALUE_ADDRESS of 0 into a LOC_UNRESOLVED symbol. This was |
| necessary for platforms (maybe Alpha, certainly PowerPC GNU/Linux |
| with some versions of binutils) where shared libraries could have |
| relocations against symbols in their debug information - the |
| minimal symbol would have the right address, but the debug info |
| would not. It's no longer necessary, because we will explicitly |
| apply relocations when we read in the debug information now. */ |
| |
| /* A DW_AT_location attribute with no contents indicates that a |
| variable has been optimized away. */ |
| if (attr_form_is_block (attr) && DW_BLOCK (attr)->size == 0) |
| { |
| SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; |
| return; |
| } |
| |
| /* Handle one degenerate form of location expression specially, to |
| preserve GDB's previous behavior when section offsets are |
| specified. If this is just a DW_OP_addr or DW_OP_GNU_addr_index |
| then mark this symbol as LOC_STATIC. */ |
| |
| if (attr_form_is_block (attr) |
| && ((DW_BLOCK (attr)->data[0] == DW_OP_addr |
| && DW_BLOCK (attr)->size == 1 + cu_header->addr_size) |
| || (DW_BLOCK (attr)->data[0] == DW_OP_GNU_addr_index |
| && (DW_BLOCK (attr)->size |
| == 1 + leb128_size (&DW_BLOCK (attr)->data[1]))))) |
| { |
| unsigned int dummy; |
| |
| if (DW_BLOCK (attr)->data[0] == DW_OP_addr) |
| SYMBOL_VALUE_ADDRESS (sym) = |
| read_address (objfile->obfd, DW_BLOCK (attr)->data + 1, cu, &dummy); |
| else |
| SYMBOL_VALUE_ADDRESS (sym) = |
| read_addr_index_from_leb128 (cu, DW_BLOCK (attr)->data + 1, &dummy); |
| SYMBOL_ACLASS_INDEX (sym) = LOC_STATIC; |
| fixup_symbol_section (sym, objfile); |
| SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (objfile->section_offsets, |
| SYMBOL_SECTION (sym)); |
| return; |
| } |
| |
| /* NOTE drow/2002-01-30: It might be worthwhile to have a static |
| expression evaluator, and use LOC_COMPUTED only when necessary |
| (i.e. when the value of a register or memory location is |
| referenced, or a thread-local block, etc.). Then again, it might |
| not be worthwhile. I'm assuming that it isn't unless performance |
| or memory numbers show me otherwise. */ |
| |
| dwarf2_symbol_mark_computed (attr, sym, cu, 0); |
| |
| if (SYMBOL_COMPUTED_OPS (sym)->location_has_loclist) |
| cu->has_loclist = 1; |
| } |
| |
| /* Given a pointer to a DWARF information entry, figure out if we need |
| to make a symbol table entry for it, and if so, create a new entry |
| and return a pointer to it. |
| If TYPE is NULL, determine symbol type from the die, otherwise |
| used the passed type. |
| If SPACE is not NULL, use it to hold the new symbol. If it is |
| NULL, allocate a new symbol on the objfile's obstack. */ |
| |
| static struct symbol * |
| new_symbol_full (struct die_info *die, struct type *type, struct dwarf2_cu *cu, |
| struct symbol *space) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| struct symbol *sym = NULL; |
| const char *name; |
| struct attribute *attr = NULL; |
| struct attribute *attr2 = NULL; |
| CORE_ADDR baseaddr; |
| struct pending **list_to_add = NULL; |
| |
| int inlined_func = (die->tag == DW_TAG_inlined_subroutine); |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| name = dwarf2_name (die, cu); |
| if (name) |
| { |
| const char *linkagename; |
| int suppress_add = 0; |
| |
| if (space) |
| sym = space; |
| else |
| sym = allocate_symbol (objfile); |
| OBJSTAT (objfile, n_syms++); |
| |
| /* Cache this symbol's name and the name's demangled form (if any). */ |
| SYMBOL_SET_LANGUAGE (sym, cu->language, &objfile->objfile_obstack); |
| linkagename = dwarf2_physname (name, die, cu); |
| SYMBOL_SET_NAMES (sym, linkagename, strlen (linkagename), 0, objfile); |
| |
| /* Fortran does not have mangling standard and the mangling does differ |
| between gfortran, iFort etc. */ |
| if (cu->language == language_fortran |
| && symbol_get_demangled_name (&(sym->ginfo)) == NULL) |
| symbol_set_demangled_name (&(sym->ginfo), |
| dwarf2_full_name (name, die, cu), |
| NULL); |
| |
| /* Default assumptions. |
| Use the passed type or decode it from the die. */ |
| SYMBOL_DOMAIN (sym) = VAR_DOMAIN; |
| SYMBOL_ACLASS_INDEX (sym) = LOC_OPTIMIZED_OUT; |
| if (type != NULL) |
| SYMBOL_TYPE (sym) = type; |
| else |
| SYMBOL_TYPE (sym) = die_type (die, cu); |
| attr = dwarf2_attr (die, |
| inlined_func ? DW_AT_call_line : DW_AT_decl_line, |
| cu); |
| if (attr) |
| { |
| SYMBOL_LINE (sym) = DW_UNSND (attr); |
| } |
| |
| attr = dwarf2_attr (die, |
| inlined_func ? DW_AT_call_file : DW_AT_decl_file, |
| cu); |
| if (attr) |
| { |
| int file_index = DW_UNSND (attr); |
| |
| if (cu->line_header == NULL |
| || file_index > cu->line_header->num_file_names) |
| complaint (&symfile_complaints, |
| _("file index out of range")); |
| else if (file_index > 0) |
| { |
| struct file_entry *fe; |
| |
| fe = &cu->line_header->file_names[file_index - 1]; |
| symbol_set_symtab (sym, fe->symtab); |
| } |
| } |
| |
| switch (die->tag) |
| { |
| case DW_TAG_label: |
| attr = dwarf2_attr (die, DW_AT_low_pc, cu); |
| if (attr) |
| { |
| CORE_ADDR addr; |
| |
| addr = attr_value_as_address (attr); |
| addr = gdbarch_adjust_dwarf2_addr (gdbarch, addr + baseaddr); |
| SYMBOL_VALUE_ADDRESS (sym) = addr; |
| } |
| SYMBOL_TYPE (sym) = objfile_type (objfile)->builtin_core_addr; |
| SYMBOL_DOMAIN (sym) = LABEL_DOMAIN; |
| SYMBOL_ACLASS_INDEX (sym) = LOC_LABEL; |
| add_symbol_to_list (sym, cu->list_in_scope); |
| break; |
| case DW_TAG_subprogram: |
| /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by |
| finish_block. */ |
| SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK; |
| attr2 = dwarf2_attr (die, DW_AT_external, cu); |
| if ((attr2 && (DW_UNSND (attr2) != 0)) |
| || cu->language == language_ada) |
| { |
| /* Subprograms marked external are stored as a global symbol. |
| Ada subprograms, whether marked external or not, are always |
| stored as a global symbol, because we want to be able to |
| access them globally. For instance, we want to be able |
| to break on a nested subprogram without having to |
| specify the context. */ |
| list_to_add = &global_symbols; |
| } |
| else |
| { |
| list_to_add = cu->list_in_scope; |
| } |
| break; |
| case DW_TAG_inlined_subroutine: |
| /* SYMBOL_BLOCK_VALUE (sym) will be filled in later by |
| finish_block. */ |
| SYMBOL_ACLASS_INDEX (sym) = LOC_BLOCK; |
| SYMBOL_INLINED (sym) = 1; |
| list_to_add = cu->list_in_scope; |
| break; |
| case DW_TAG_template_value_param: |
| suppress_add = 1; |
| /* Fall through. */ |
| case DW_TAG_constant: |
| case DW_TAG_variable: |
| case DW_TAG_member: |
| /* Compilation with minimal debug info may result in |
| variables with missing type entries. Change the |
| misleading `void' type to something sensible. */ |
| if (TYPE_CODE (SYMBOL_TYPE (sym)) == TYPE_CODE_VOID) |
| SYMBOL_TYPE (sym) |
| = objfile_type (objfile)->nodebug_data_symbol; |
| |
| attr = dwarf2_attr (die, DW_AT_const_value, cu); |
| /* In the case of DW_TAG_member, we should only be called for |
| static const members. */ |
| if (die->tag == DW_TAG_member) |
| { |
| /* dwarf2_add_field uses die_is_declaration, |
| so we do the same. */ |
| gdb_assert (die_is_declaration (die, cu)); |
| gdb_assert (attr); |
| } |
| if (attr) |
| { |
| dwarf2_const_value (attr, sym, cu); |
| attr2 = dwarf2_attr (die, DW_AT_external, cu); |
| if (!suppress_add) |
| { |
| if (attr2 && (DW_UNSND (attr2) != 0)) |
| list_to_add = &global_symbols; |
| else |
| list_to_add = cu->list_in_scope; |
| } |
| break; |
| } |
| attr = dwarf2_attr (die, DW_AT_location, cu); |
| if (attr) |
| { |
| var_decode_location (attr, sym, cu); |
| attr2 = dwarf2_attr (die, DW_AT_external, cu); |
| |
| /* Fortran explicitly imports any global symbols to the local |
| scope by DW_TAG_common_block. */ |
| if (cu->language == language_fortran && die->parent |
| && die->parent->tag == DW_TAG_common_block) |
| attr2 = NULL; |
| |
| if (SYMBOL_CLASS (sym) == LOC_STATIC |
| && SYMBOL_VALUE_ADDRESS (sym) == 0 |
| && !dwarf2_per_objfile->has_section_at_zero) |
| { |
| /* When a static variable is eliminated by the linker, |
| the corresponding debug information is not stripped |
| out, but the variable address is set to null; |
| do not add such variables into symbol table. */ |
| } |
| else if (attr2 && (DW_UNSND (attr2) != 0)) |
| { |
| /* Workaround gfortran PR debug/40040 - it uses |
| DW_AT_location for variables in -fPIC libraries which may |
| get overriden by other libraries/executable and get |
| a different address. Resolve it by the minimal symbol |
| which may come from inferior's executable using copy |
| relocation. Make this workaround only for gfortran as for |
| other compilers GDB cannot guess the minimal symbol |
| Fortran mangling kind. */ |
| if (cu->language == language_fortran && die->parent |
| && die->parent->tag == DW_TAG_module |
| && cu->producer |
| && startswith (cu->producer, "GNU Fortran")) |
| SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED; |
| |
| /* A variable with DW_AT_external is never static, |
| but it may be block-scoped. */ |
| list_to_add = (cu->list_in_scope == &file_symbols |
| ? &global_symbols : cu->list_in_scope); |
| } |
| else |
| list_to_add = cu->list_in_scope; |
| } |
| else |
| { |
| /* We do not know the address of this symbol. |
| If it is an external symbol and we have type information |
| for it, enter the symbol as a LOC_UNRESOLVED symbol. |
| The address of the variable will then be determined from |
| the minimal symbol table whenever the variable is |
| referenced. */ |
| attr2 = dwarf2_attr (die, DW_AT_external, cu); |
| |
| /* Fortran explicitly imports any global symbols to the local |
| scope by DW_TAG_common_block. */ |
| if (cu->language == language_fortran && die->parent |
| && die->parent->tag == DW_TAG_common_block) |
| { |
| /* SYMBOL_CLASS doesn't matter here because |
| read_common_block is going to reset it. */ |
| if (!suppress_add) |
| list_to_add = cu->list_in_scope; |
| } |
| else if (attr2 && (DW_UNSND (attr2) != 0) |
| && dwarf2_attr (die, DW_AT_type, cu) != NULL) |
| { |
| /* A variable with DW_AT_external is never static, but it |
| may be block-scoped. */ |
| list_to_add = (cu->list_in_scope == &file_symbols |
| ? &global_symbols : cu->list_in_scope); |
| |
| SYMBOL_ACLASS_INDEX (sym) = LOC_UNRESOLVED; |
| } |
| else if (!die_is_declaration (die, cu)) |
| { |
| /* Use the default LOC_OPTIMIZED_OUT class. */ |
| gdb_assert (SYMBOL_CLASS (sym) == LOC_OPTIMIZED_OUT); |
| if (!suppress_add) |
| list_to_add = cu->list_in_scope; |
| } |
| } |
| break; |
| case DW_TAG_formal_parameter: |
| /* If we are inside a function, mark this as an argument. If |
| not, we might be looking at an argument to an inlined function |
| when we do not have enough information to show inlined frames; |
| pretend it's a local variable in that case so that the user can |
| still see it. */ |
| if (context_stack_depth > 0 |
| && context_stack[context_stack_depth - 1].name != NULL) |
| SYMBOL_IS_ARGUMENT (sym) = 1; |
| attr = dwarf2_attr (die, DW_AT_location, cu); |
| if (attr) |
| { |
| var_decode_location (attr, sym, cu); |
| } |
| attr = dwarf2_attr (die, DW_AT_const_value, cu); |
| if (attr) |
| { |
| dwarf2_const_value (attr, sym, cu); |
| } |
| |
| list_to_add = cu->list_in_scope; |
| break; |
| case DW_TAG_unspecified_parameters: |
| /* From varargs functions; gdb doesn't seem to have any |
| interest in this information, so just ignore it for now. |
| (FIXME?) */ |
| break; |
| case DW_TAG_template_type_param: |
| suppress_add = 1; |
| /* Fall through. */ |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| case DW_TAG_set_type: |
| case DW_TAG_enumeration_type: |
| SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; |
| SYMBOL_DOMAIN (sym) = STRUCT_DOMAIN; |
| |
| { |
| /* NOTE: carlton/2003-11-10: C++ class symbols shouldn't |
| really ever be static objects: otherwise, if you try |
| to, say, break of a class's method and you're in a file |
| which doesn't mention that class, it won't work unless |
| the check for all static symbols in lookup_symbol_aux |
| saves you. See the OtherFileClass tests in |
| gdb.c++/namespace.exp. */ |
| |
| if (!suppress_add) |
| { |
| list_to_add = (cu->list_in_scope == &file_symbols |
| && cu->language == language_cplus |
| ? &global_symbols : cu->list_in_scope); |
| |
| /* The semantics of C++ state that "struct foo { |
| ... }" also defines a typedef for "foo". */ |
| if (cu->language == language_cplus |
| || cu->language == language_ada |
| || cu->language == language_d |
| || cu->language == language_rust) |
| { |
| /* The symbol's name is already allocated along |
| with this objfile, so we don't need to |
| duplicate it for the type. */ |
| if (TYPE_NAME (SYMBOL_TYPE (sym)) == 0) |
| TYPE_NAME (SYMBOL_TYPE (sym)) = SYMBOL_SEARCH_NAME (sym); |
| } |
| } |
| } |
| break; |
| case DW_TAG_typedef: |
| SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; |
| SYMBOL_DOMAIN (sym) = VAR_DOMAIN; |
| list_to_add = cu->list_in_scope; |
| break; |
| case DW_TAG_base_type: |
| case DW_TAG_subrange_type: |
| SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; |
| SYMBOL_DOMAIN (sym) = VAR_DOMAIN; |
| list_to_add = cu->list_in_scope; |
| break; |
| case DW_TAG_enumerator: |
| attr = dwarf2_attr (die, DW_AT_const_value, cu); |
| if (attr) |
| { |
| dwarf2_const_value (attr, sym, cu); |
| } |
| { |
| /* NOTE: carlton/2003-11-10: See comment above in the |
| DW_TAG_class_type, etc. block. */ |
| |
| list_to_add = (cu->list_in_scope == &file_symbols |
| && cu->language == language_cplus |
| ? &global_symbols : cu->list_in_scope); |
| } |
| break; |
| case DW_TAG_imported_declaration: |
| case DW_TAG_namespace: |
| SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; |
| list_to_add = &global_symbols; |
| break; |
| case DW_TAG_module: |
| SYMBOL_ACLASS_INDEX (sym) = LOC_TYPEDEF; |
| SYMBOL_DOMAIN (sym) = MODULE_DOMAIN; |
| list_to_add = &global_symbols; |
| break; |
| case DW_TAG_common_block: |
| SYMBOL_ACLASS_INDEX (sym) = LOC_COMMON_BLOCK; |
| SYMBOL_DOMAIN (sym) = COMMON_BLOCK_DOMAIN; |
| add_symbol_to_list (sym, cu->list_in_scope); |
| break; |
| default: |
| /* Not a tag we recognize. Hopefully we aren't processing |
| trash data, but since we must specifically ignore things |
| we don't recognize, there is nothing else we should do at |
| this point. */ |
| complaint (&symfile_complaints, _("unsupported tag: '%s'"), |
| dwarf_tag_name (die->tag)); |
| break; |
| } |
| |
| if (suppress_add) |
| { |
| sym->hash_next = objfile->template_symbols; |
| objfile->template_symbols = sym; |
| list_to_add = NULL; |
| } |
| |
| if (list_to_add != NULL) |
| add_symbol_to_list (sym, list_to_add); |
| |
| /* For the benefit of old versions of GCC, check for anonymous |
| namespaces based on the demangled name. */ |
| if (!cu->processing_has_namespace_info |
| && cu->language == language_cplus) |
| cp_scan_for_anonymous_namespaces (sym, objfile); |
| } |
| return (sym); |
| } |
| |
| /* A wrapper for new_symbol_full that always allocates a new symbol. */ |
| |
| static struct symbol * |
| new_symbol (struct die_info *die, struct type *type, struct dwarf2_cu *cu) |
| { |
| return new_symbol_full (die, type, cu, NULL); |
| } |
| |
| /* Given an attr with a DW_FORM_dataN value in host byte order, |
| zero-extend it as appropriate for the symbol's type. The DWARF |
| standard (v4) is not entirely clear about the meaning of using |
| DW_FORM_dataN for a constant with a signed type, where the type is |
| wider than the data. The conclusion of a discussion on the DWARF |
| list was that this is unspecified. We choose to always zero-extend |
| because that is the interpretation long in use by GCC. */ |
| |
| static gdb_byte * |
| dwarf2_const_value_data (const struct attribute *attr, struct obstack *obstack, |
| struct dwarf2_cu *cu, LONGEST *value, int bits) |
| { |
| struct objfile *objfile = cu->objfile; |
| enum bfd_endian byte_order = bfd_big_endian (objfile->obfd) ? |
| BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE; |
| LONGEST l = DW_UNSND (attr); |
| |
| if (bits < sizeof (*value) * 8) |
| { |
| l &= ((LONGEST) 1 << bits) - 1; |
| *value = l; |
| } |
| else if (bits == sizeof (*value) * 8) |
| *value = l; |
| else |
| { |
| gdb_byte *bytes = (gdb_byte *) obstack_alloc (obstack, bits / 8); |
| store_unsigned_integer (bytes, bits / 8, byte_order, l); |
| return bytes; |
| } |
| |
| return NULL; |
| } |
| |
| /* Read a constant value from an attribute. Either set *VALUE, or if |
| the value does not fit in *VALUE, set *BYTES - either already |
| allocated on the objfile obstack, or newly allocated on OBSTACK, |
| or, set *BATON, if we translated the constant to a location |
| expression. */ |
| |
| static void |
| dwarf2_const_value_attr (const struct attribute *attr, struct type *type, |
| const char *name, struct obstack *obstack, |
| struct dwarf2_cu *cu, |
| LONGEST *value, const gdb_byte **bytes, |
| struct dwarf2_locexpr_baton **baton) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct comp_unit_head *cu_header = &cu->header; |
| struct dwarf_block *blk; |
| enum bfd_endian byte_order = (bfd_big_endian (objfile->obfd) ? |
| BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); |
| |
| *value = 0; |
| *bytes = NULL; |
| *baton = NULL; |
| |
| switch (attr->form) |
| { |
| case DW_FORM_addr: |
| case DW_FORM_GNU_addr_index: |
| { |
| gdb_byte *data; |
| |
| if (TYPE_LENGTH (type) != cu_header->addr_size) |
| dwarf2_const_value_length_mismatch_complaint (name, |
| cu_header->addr_size, |
| TYPE_LENGTH (type)); |
| /* Symbols of this form are reasonably rare, so we just |
| piggyback on the existing location code rather than writing |
| a new implementation of symbol_computed_ops. */ |
| *baton = XOBNEW (obstack, struct dwarf2_locexpr_baton); |
| (*baton)->per_cu = cu->per_cu; |
| gdb_assert ((*baton)->per_cu); |
| |
| (*baton)->size = 2 + cu_header->addr_size; |
| data = (gdb_byte *) obstack_alloc (obstack, (*baton)->size); |
| (*baton)->data = data; |
| |
| data[0] = DW_OP_addr; |
| store_unsigned_integer (&data[1], cu_header->addr_size, |
| byte_order, DW_ADDR (attr)); |
| data[cu_header->addr_size + 1] = DW_OP_stack_value; |
| } |
| break; |
| case DW_FORM_string: |
| case DW_FORM_strp: |
| case DW_FORM_GNU_str_index: |
| case DW_FORM_GNU_strp_alt: |
| /* DW_STRING is already allocated on the objfile obstack, point |
| directly to it. */ |
| *bytes = (const gdb_byte *) DW_STRING (attr); |
| break; |
| case DW_FORM_block1: |
| case DW_FORM_block2: |
| case DW_FORM_block4: |
| case DW_FORM_block: |
| case DW_FORM_exprloc: |
| blk = DW_BLOCK (attr); |
| if (TYPE_LENGTH (type) != blk->size) |
| dwarf2_const_value_length_mismatch_complaint (name, blk->size, |
| TYPE_LENGTH (type)); |
| *bytes = blk->data; |
| break; |
| |
| /* The DW_AT_const_value attributes are supposed to carry the |
| symbol's value "represented as it would be on the target |
| architecture." By the time we get here, it's already been |
| converted to host endianness, so we just need to sign- or |
| zero-extend it as appropriate. */ |
| case DW_FORM_data1: |
| *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 8); |
| break; |
| case DW_FORM_data2: |
| *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 16); |
| break; |
| case DW_FORM_data4: |
| *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 32); |
| break; |
| case DW_FORM_data8: |
| *bytes = dwarf2_const_value_data (attr, obstack, cu, value, 64); |
| break; |
| |
| case DW_FORM_sdata: |
| *value = DW_SND (attr); |
| break; |
| |
| case DW_FORM_udata: |
| *value = DW_UNSND (attr); |
| break; |
| |
| default: |
| complaint (&symfile_complaints, |
| _("unsupported const value attribute form: '%s'"), |
| dwarf_form_name (attr->form)); |
| *value = 0; |
| break; |
| } |
| } |
| |
| |
| /* Copy constant value from an attribute to a symbol. */ |
| |
| static void |
| dwarf2_const_value (const struct attribute *attr, struct symbol *sym, |
| struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| LONGEST value; |
| const gdb_byte *bytes; |
| struct dwarf2_locexpr_baton *baton; |
| |
| dwarf2_const_value_attr (attr, SYMBOL_TYPE (sym), |
| SYMBOL_PRINT_NAME (sym), |
| &objfile->objfile_obstack, cu, |
| &value, &bytes, &baton); |
| |
| if (baton != NULL) |
| { |
| SYMBOL_LOCATION_BATON (sym) = baton; |
| SYMBOL_ACLASS_INDEX (sym) = dwarf2_locexpr_index; |
| } |
| else if (bytes != NULL) |
| { |
| SYMBOL_VALUE_BYTES (sym) = bytes; |
| SYMBOL_ACLASS_INDEX (sym) = LOC_CONST_BYTES; |
| } |
| else |
| { |
| SYMBOL_VALUE (sym) = value; |
| SYMBOL_ACLASS_INDEX (sym) = LOC_CONST; |
| } |
| } |
| |
| /* Return the type of the die in question using its DW_AT_type attribute. */ |
| |
| static struct type * |
| die_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *type_attr; |
| |
| type_attr = dwarf2_attr (die, DW_AT_type, cu); |
| if (!type_attr) |
| { |
| /* A missing DW_AT_type represents a void type. */ |
| return objfile_type (cu->objfile)->builtin_void; |
| } |
| |
| return lookup_die_type (die, type_attr, cu); |
| } |
| |
| /* True iff CU's producer generates GNAT Ada auxiliary information |
| that allows to find parallel types through that information instead |
| of having to do expensive parallel lookups by type name. */ |
| |
| static int |
| need_gnat_info (struct dwarf2_cu *cu) |
| { |
| /* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version |
| of GNAT produces this auxiliary information, without any indication |
| that it is produced. Part of enhancing the FSF version of GNAT |
| to produce that information will be to put in place an indicator |
| that we can use in order to determine whether the descriptive type |
| info is available or not. One suggestion that has been made is |
| to use a new attribute, attached to the CU die. For now, assume |
| that the descriptive type info is not available. */ |
| return 0; |
| } |
| |
| /* Return the auxiliary type of the die in question using its |
| DW_AT_GNAT_descriptive_type attribute. Returns NULL if the |
| attribute is not present. */ |
| |
| static struct type * |
| die_descriptive_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *type_attr; |
| |
| type_attr = dwarf2_attr (die, DW_AT_GNAT_descriptive_type, cu); |
| if (!type_attr) |
| return NULL; |
| |
| return lookup_die_type (die, type_attr, cu); |
| } |
| |
| /* If DIE has a descriptive_type attribute, then set the TYPE's |
| descriptive type accordingly. */ |
| |
| static void |
| set_descriptive_type (struct type *type, struct die_info *die, |
| struct dwarf2_cu *cu) |
| { |
| struct type *descriptive_type = die_descriptive_type (die, cu); |
| |
| if (descriptive_type) |
| { |
| ALLOCATE_GNAT_AUX_TYPE (type); |
| TYPE_DESCRIPTIVE_TYPE (type) = descriptive_type; |
| } |
| } |
| |
| /* Return the containing type of the die in question using its |
| DW_AT_containing_type attribute. */ |
| |
| static struct type * |
| die_containing_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *type_attr; |
| |
| type_attr = dwarf2_attr (die, DW_AT_containing_type, cu); |
| if (!type_attr) |
| error (_("Dwarf Error: Problem turning containing type into gdb type " |
| "[in module %s]"), objfile_name (cu->objfile)); |
| |
| return lookup_die_type (die, type_attr, cu); |
| } |
| |
| /* Return an error marker type to use for the ill formed type in DIE/CU. */ |
| |
| static struct type * |
| build_error_marker_type (struct dwarf2_cu *cu, struct die_info *die) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| char *message, *saved; |
| |
| message = xstrprintf (_("<unknown type in %s, CU 0x%x, DIE 0x%x>"), |
| objfile_name (objfile), |
| cu->header.offset.sect_off, |
| die->offset.sect_off); |
| saved = (char *) obstack_copy0 (&objfile->objfile_obstack, |
| message, strlen (message)); |
| xfree (message); |
| |
| return init_type (objfile, TYPE_CODE_ERROR, 0, saved); |
| } |
| |
| /* Look up the type of DIE in CU using its type attribute ATTR. |
| ATTR must be one of: DW_AT_type, DW_AT_GNAT_descriptive_type, |
| DW_AT_containing_type. |
| If there is no type substitute an error marker. */ |
| |
| static struct type * |
| lookup_die_type (struct die_info *die, const struct attribute *attr, |
| struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| struct type *this_type; |
| |
| gdb_assert (attr->name == DW_AT_type |
| || attr->name == DW_AT_GNAT_descriptive_type |
| || attr->name == DW_AT_containing_type); |
| |
| /* First see if we have it cached. */ |
| |
| if (attr->form == DW_FORM_GNU_ref_alt) |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| sect_offset offset = dwarf2_get_ref_die_offset (attr); |
| |
| per_cu = dwarf2_find_containing_comp_unit (offset, 1, cu->objfile); |
| this_type = get_die_type_at_offset (offset, per_cu); |
| } |
| else if (attr_form_is_ref (attr)) |
| { |
| sect_offset offset = dwarf2_get_ref_die_offset (attr); |
| |
| this_type = get_die_type_at_offset (offset, cu->per_cu); |
| } |
| else if (attr->form == DW_FORM_ref_sig8) |
| { |
| ULONGEST signature = DW_SIGNATURE (attr); |
| |
| return get_signatured_type (die, signature, cu); |
| } |
| else |
| { |
| complaint (&symfile_complaints, |
| _("Dwarf Error: Bad type attribute %s in DIE" |
| " at 0x%x [in module %s]"), |
| dwarf_attr_name (attr->name), die->offset.sect_off, |
| objfile_name (objfile)); |
| return build_error_marker_type (cu, die); |
| } |
| |
| /* If not cached we need to read it in. */ |
| |
| if (this_type == NULL) |
| { |
| struct die_info *type_die = NULL; |
| struct dwarf2_cu *type_cu = cu; |
| |
| if (attr_form_is_ref (attr)) |
| type_die = follow_die_ref (die, attr, &type_cu); |
| if (type_die == NULL) |
| return build_error_marker_type (cu, die); |
| /* If we find the type now, it's probably because the type came |
| from an inter-CU reference and the type's CU got expanded before |
| ours. */ |
| this_type = read_type_die (type_die, type_cu); |
| } |
| |
| /* If we still don't have a type use an error marker. */ |
| |
| if (this_type == NULL) |
| return build_error_marker_type (cu, die); |
| |
| return this_type; |
| } |
| |
| /* Return the type in DIE, CU. |
| Returns NULL for invalid types. |
| |
| This first does a lookup in die_type_hash, |
| and only reads the die in if necessary. |
| |
| NOTE: This can be called when reading in partial or full symbols. */ |
| |
| static struct type * |
| read_type_die (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *this_type; |
| |
| this_type = get_die_type (die, cu); |
| if (this_type) |
| return this_type; |
| |
| return read_type_die_1 (die, cu); |
| } |
| |
| /* Read the type in DIE, CU. |
| Returns NULL for invalid types. */ |
| |
| static struct type * |
| read_type_die_1 (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct type *this_type = NULL; |
| |
| switch (die->tag) |
| { |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| this_type = read_structure_type (die, cu); |
| break; |
| case DW_TAG_enumeration_type: |
| this_type = read_enumeration_type (die, cu); |
| break; |
| case DW_TAG_subprogram: |
| case DW_TAG_subroutine_type: |
| case DW_TAG_inlined_subroutine: |
| this_type = read_subroutine_type (die, cu); |
| break; |
| case DW_TAG_array_type: |
| this_type = read_array_type (die, cu); |
| break; |
| case DW_TAG_set_type: |
| this_type = read_set_type (die, cu); |
| break; |
| case DW_TAG_pointer_type: |
| this_type = read_tag_pointer_type (die, cu); |
| break; |
| case DW_TAG_ptr_to_member_type: |
| this_type = read_tag_ptr_to_member_type (die, cu); |
| break; |
| case DW_TAG_reference_type: |
| this_type = read_tag_reference_type (die, cu); |
| break; |
| case DW_TAG_const_type: |
| this_type = read_tag_const_type (die, cu); |
| break; |
| case DW_TAG_volatile_type: |
| this_type = read_tag_volatile_type (die, cu); |
| break; |
| case DW_TAG_restrict_type: |
| this_type = read_tag_restrict_type (die, cu); |
| break; |
| case DW_TAG_string_type: |
| this_type = read_tag_string_type (die, cu); |
| break; |
| case DW_TAG_typedef: |
| this_type = read_typedef (die, cu); |
| break; |
| case DW_TAG_subrange_type: |
| this_type = read_subrange_type (die, cu); |
| break; |
| case DW_TAG_base_type: |
| this_type = read_base_type (die, cu); |
| break; |
| case DW_TAG_unspecified_type: |
| this_type = read_unspecified_type (die, cu); |
| break; |
| case DW_TAG_namespace: |
| this_type = read_namespace_type (die, cu); |
| break; |
| case DW_TAG_module: |
| this_type = read_module_type (die, cu); |
| break; |
| case DW_TAG_atomic_type: |
| this_type = read_tag_atomic_type (die, cu); |
| break; |
| default: |
| complaint (&symfile_complaints, |
| _("unexpected tag in read_type_die: '%s'"), |
| dwarf_tag_name (die->tag)); |
| break; |
| } |
| |
| return this_type; |
| } |
| |
| /* See if we can figure out if the class lives in a namespace. We do |
| this by looking for a member function; its demangled name will |
| contain namespace info, if there is any. |
| Return the computed name or NULL. |
| Space for the result is allocated on the objfile's obstack. |
| This is the full-die version of guess_partial_die_structure_name. |
| In this case we know DIE has no useful parent. */ |
| |
| static char * |
| guess_full_die_structure_name (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct die_info *spec_die; |
| struct dwarf2_cu *spec_cu; |
| struct die_info *child; |
| |
| spec_cu = cu; |
| spec_die = die_specification (die, &spec_cu); |
| if (spec_die != NULL) |
| { |
| die = spec_die; |
| cu = spec_cu; |
| } |
| |
| for (child = die->child; |
| child != NULL; |
| child = child->sibling) |
| { |
| if (child->tag == DW_TAG_subprogram) |
| { |
| const char *linkage_name; |
| |
| linkage_name = dwarf2_string_attr (child, DW_AT_linkage_name, cu); |
| if (linkage_name == NULL) |
| linkage_name = dwarf2_string_attr (child, DW_AT_MIPS_linkage_name, |
| cu); |
| if (linkage_name != NULL) |
| { |
| char *actual_name |
| = language_class_name_from_physname (cu->language_defn, |
| linkage_name); |
| char *name = NULL; |
| |
| if (actual_name != NULL) |
| { |
| const char *die_name = dwarf2_name (die, cu); |
| |
| if (die_name != NULL |
| && strcmp (die_name, actual_name) != 0) |
| { |
| /* Strip off the class name from the full name. |
| We want the prefix. */ |
| int die_name_len = strlen (die_name); |
| int actual_name_len = strlen (actual_name); |
| |
| /* Test for '::' as a sanity check. */ |
| if (actual_name_len > die_name_len + 2 |
| && actual_name[actual_name_len |
| - die_name_len - 1] == ':') |
| name = (char *) obstack_copy0 ( |
| &cu->objfile->per_bfd->storage_obstack, |
| actual_name, actual_name_len - die_name_len - 2); |
| } |
| } |
| xfree (actual_name); |
| return name; |
| } |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* GCC might emit a nameless typedef that has a linkage name. Determine the |
| prefix part in such case. See |
| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ |
| |
| static char * |
| anonymous_struct_prefix (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| const char *base; |
| |
| if (die->tag != DW_TAG_class_type && die->tag != DW_TAG_interface_type |
| && die->tag != DW_TAG_structure_type && die->tag != DW_TAG_union_type) |
| return NULL; |
| |
| if (dwarf2_string_attr (die, DW_AT_name, cu) != NULL) |
| return NULL; |
| |
| attr = dwarf2_attr (die, DW_AT_linkage_name, cu); |
| if (attr == NULL) |
| attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); |
| if (attr == NULL || DW_STRING (attr) == NULL) |
| return NULL; |
| |
| /* dwarf2_name had to be already called. */ |
| gdb_assert (DW_STRING_IS_CANONICAL (attr)); |
| |
| /* Strip the base name, keep any leading namespaces/classes. */ |
| base = strrchr (DW_STRING (attr), ':'); |
| if (base == NULL || base == DW_STRING (attr) || base[-1] != ':') |
| return ""; |
| |
| return (char *) obstack_copy0 (&cu->objfile->per_bfd->storage_obstack, |
| DW_STRING (attr), |
| &base[-1] - DW_STRING (attr)); |
| } |
| |
| /* Return the name of the namespace/class that DIE is defined within, |
| or "" if we can't tell. The caller should not xfree the result. |
| |
| For example, if we're within the method foo() in the following |
| code: |
| |
| namespace N { |
| class C { |
| void foo () { |
| } |
| }; |
| } |
| |
| then determine_prefix on foo's die will return "N::C". */ |
| |
| static const char * |
| determine_prefix (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct die_info *parent, *spec_die; |
| struct dwarf2_cu *spec_cu; |
| struct type *parent_type; |
| char *retval; |
| |
| if (cu->language != language_cplus |
| && cu->language != language_fortran && cu->language != language_d |
| && cu->language != language_rust) |
| return ""; |
| |
| retval = anonymous_struct_prefix (die, cu); |
| if (retval) |
| return retval; |
| |
| /* We have to be careful in the presence of DW_AT_specification. |
| For example, with GCC 3.4, given the code |
| |
| namespace N { |
| void foo() { |
| // Definition of N::foo. |
| } |
| } |
| |
| then we'll have a tree of DIEs like this: |
| |
| 1: DW_TAG_compile_unit |
| 2: DW_TAG_namespace // N |
| 3: DW_TAG_subprogram // declaration of N::foo |
| 4: DW_TAG_subprogram // definition of N::foo |
| DW_AT_specification // refers to die #3 |
| |
| Thus, when processing die #4, we have to pretend that we're in |
| the context of its DW_AT_specification, namely the contex of die |
| #3. */ |
| spec_cu = cu; |
| spec_die = die_specification (die, &spec_cu); |
| if (spec_die == NULL) |
| parent = die->parent; |
| else |
| { |
| parent = spec_die->parent; |
| cu = spec_cu; |
| } |
| |
| if (parent == NULL) |
| return ""; |
| else if (parent->building_fullname) |
| { |
| const char *name; |
| const char *parent_name; |
| |
| /* It has been seen on RealView 2.2 built binaries, |
| DW_TAG_template_type_param types actually _defined_ as |
| children of the parent class: |
| |
| enum E {}; |
| template class <class Enum> Class{}; |
| Class<enum E> class_e; |
| |
| 1: DW_TAG_class_type (Class) |
| 2: DW_TAG_enumeration_type (E) |
| 3: DW_TAG_enumerator (enum1:0) |
| 3: DW_TAG_enumerator (enum2:1) |
| ... |
| 2: DW_TAG_template_type_param |
| DW_AT_type DW_FORM_ref_udata (E) |
| |
| Besides being broken debug info, it can put GDB into an |
| infinite loop. Consider: |
| |
| When we're building the full name for Class<E>, we'll start |
| at Class, and go look over its template type parameters, |
| finding E. We'll then try to build the full name of E, and |
| reach here. We're now trying to build the full name of E, |
| and look over the parent DIE for containing scope. In the |
| broken case, if we followed the parent DIE of E, we'd again |
| find Class, and once again go look at its template type |
| arguments, etc., etc. Simply don't consider such parent die |
| as source-level parent of this die (it can't be, the language |
| doesn't allow it), and break the loop here. */ |
| name = dwarf2_name (die, cu); |
| parent_name = dwarf2_name (parent, cu); |
| complaint (&symfile_complaints, |
| _("template param type '%s' defined within parent '%s'"), |
| name ? name : "<unknown>", |
| parent_name ? parent_name : "<unknown>"); |
| return ""; |
| } |
| else |
| switch (parent->tag) |
| { |
| case DW_TAG_namespace: |
| parent_type = read_type_die (parent, cu); |
| /* GCC 4.0 and 4.1 had a bug (PR c++/28460) where they generated bogus |
| DW_TAG_namespace DIEs with a name of "::" for the global namespace. |
| Work around this problem here. */ |
| if (cu->language == language_cplus |
| && strcmp (TYPE_TAG_NAME (parent_type), "::") == 0) |
| return ""; |
| /* We give a name to even anonymous namespaces. */ |
| return TYPE_TAG_NAME (parent_type); |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| case DW_TAG_module: |
| parent_type = read_type_die (parent, cu); |
| if (TYPE_TAG_NAME (parent_type) != NULL) |
| return TYPE_TAG_NAME (parent_type); |
| else |
| /* An anonymous structure is only allowed non-static data |
| members; no typedefs, no member functions, et cetera. |
| So it does not need a prefix. */ |
| return ""; |
| case DW_TAG_compile_unit: |
| case DW_TAG_partial_unit: |
| /* gcc-4.5 -gdwarf-4 can drop the enclosing namespace. Cope. */ |
| if (cu->language == language_cplus |
| && !VEC_empty (dwarf2_section_info_def, dwarf2_per_objfile->types) |
| && die->child != NULL |
| && (die->tag == DW_TAG_class_type |
| || die->tag == DW_TAG_structure_type |
| || die->tag == DW_TAG_union_type)) |
| { |
| char *name = guess_full_die_structure_name (die, cu); |
| if (name != NULL) |
| return name; |
| } |
| return ""; |
| case DW_TAG_enumeration_type: |
| parent_type = read_type_die (parent, cu); |
| if (TYPE_DECLARED_CLASS (parent_type)) |
| { |
| if (TYPE_TAG_NAME (parent_type) != NULL) |
| return TYPE_TAG_NAME (parent_type); |
| return ""; |
| } |
| /* Fall through. */ |
| default: |
| return determine_prefix (parent, cu); |
| } |
| } |
| |
| /* Return a newly-allocated string formed by concatenating PREFIX and SUFFIX |
| with appropriate separator. If PREFIX or SUFFIX is NULL or empty, then |
| simply copy the SUFFIX or PREFIX, respectively. If OBS is non-null, perform |
| an obconcat, otherwise allocate storage for the result. The CU argument is |
| used to determine the language and hence, the appropriate separator. */ |
| |
| #define MAX_SEP_LEN 7 /* strlen ("__") + strlen ("_MOD_") */ |
| |
| static char * |
| typename_concat (struct obstack *obs, const char *prefix, const char *suffix, |
| int physname, struct dwarf2_cu *cu) |
| { |
| const char *lead = ""; |
| const char *sep; |
| |
| if (suffix == NULL || suffix[0] == '\0' |
| || prefix == NULL || prefix[0] == '\0') |
| sep = ""; |
| else if (cu->language == language_d) |
| { |
| /* For D, the 'main' function could be defined in any module, but it |
| should never be prefixed. */ |
| if (strcmp (suffix, "D main") == 0) |
| { |
| prefix = ""; |
| sep = ""; |
| } |
| else |
| sep = "."; |
| } |
| else if (cu->language == language_fortran && physname) |
| { |
| /* This is gfortran specific mangling. Normally DW_AT_linkage_name or |
| DW_AT_MIPS_linkage_name is preferred and used instead. */ |
| |
| lead = "__"; |
| sep = "_MOD_"; |
| } |
| else |
| sep = "::"; |
| |
| if (prefix == NULL) |
| prefix = ""; |
| if (suffix == NULL) |
| suffix = ""; |
| |
| if (obs == NULL) |
| { |
| char *retval |
| = ((char *) |
| xmalloc (strlen (prefix) + MAX_SEP_LEN + strlen (suffix) + 1)); |
| |
| strcpy (retval, lead); |
| strcat (retval, prefix); |
| strcat (retval, sep); |
| strcat (retval, suffix); |
| return retval; |
| } |
| else |
| { |
| /* We have an obstack. */ |
| return obconcat (obs, lead, prefix, sep, suffix, (char *) NULL); |
| } |
| } |
| |
| /* Return sibling of die, NULL if no sibling. */ |
| |
| static struct die_info * |
| sibling_die (struct die_info *die) |
| { |
| return die->sibling; |
| } |
| |
| /* Get name of a die, return NULL if not found. */ |
| |
| static const char * |
| dwarf2_canonicalize_name (const char *name, struct dwarf2_cu *cu, |
| struct obstack *obstack) |
| { |
| if (name && cu->language == language_cplus) |
| { |
| std::string canon_name = cp_canonicalize_string (name); |
| |
| if (!canon_name.empty ()) |
| { |
| if (canon_name != name) |
| name = (const char *) obstack_copy0 (obstack, |
| canon_name.c_str (), |
| canon_name.length ()); |
| } |
| } |
| |
| return name; |
| } |
| |
| /* Get name of a die, return NULL if not found. |
| Anonymous namespaces are converted to their magic string. */ |
| |
| static const char * |
| dwarf2_name (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_name, cu); |
| if ((!attr || !DW_STRING (attr)) |
| && die->tag != DW_TAG_namespace |
| && die->tag != DW_TAG_class_type |
| && die->tag != DW_TAG_interface_type |
| && die->tag != DW_TAG_structure_type |
| && die->tag != DW_TAG_union_type) |
| return NULL; |
| |
| switch (die->tag) |
| { |
| case DW_TAG_compile_unit: |
| case DW_TAG_partial_unit: |
| /* Compilation units have a DW_AT_name that is a filename, not |
| a source language identifier. */ |
| case DW_TAG_enumeration_type: |
| case DW_TAG_enumerator: |
| /* These tags always have simple identifiers already; no need |
| to canonicalize them. */ |
| return DW_STRING (attr); |
| |
| case DW_TAG_namespace: |
| if (attr != NULL && DW_STRING (attr) != NULL) |
| return DW_STRING (attr); |
| return CP_ANONYMOUS_NAMESPACE_STR; |
| |
| case DW_TAG_class_type: |
| case DW_TAG_interface_type: |
| case DW_TAG_structure_type: |
| case DW_TAG_union_type: |
| /* Some GCC versions emit spurious DW_AT_name attributes for unnamed |
| structures or unions. These were of the form "._%d" in GCC 4.1, |
| or simply "<anonymous struct>" or "<anonymous union>" in GCC 4.3 |
| and GCC 4.4. We work around this problem by ignoring these. */ |
| if (attr && DW_STRING (attr) |
| && (startswith (DW_STRING (attr), "._") |
| || startswith (DW_STRING (attr), "<anonymous"))) |
| return NULL; |
| |
| /* GCC might emit a nameless typedef that has a linkage name. See |
| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47510. */ |
| if (!attr || DW_STRING (attr) == NULL) |
| { |
| char *demangled = NULL; |
| |
| attr = dwarf2_attr (die, DW_AT_linkage_name, cu); |
| if (attr == NULL) |
| attr = dwarf2_attr (die, DW_AT_MIPS_linkage_name, cu); |
| |
| if (attr == NULL || DW_STRING (attr) == NULL) |
| return NULL; |
| |
| /* Avoid demangling DW_STRING (attr) the second time on a second |
| call for the same DIE. */ |
| if (!DW_STRING_IS_CANONICAL (attr)) |
| demangled = gdb_demangle (DW_STRING (attr), DMGL_TYPES); |
| |
| if (demangled) |
| { |
| const char *base; |
| |
| /* FIXME: we already did this for the partial symbol... */ |
| DW_STRING (attr) |
| = ((const char *) |
| obstack_copy0 (&cu->objfile->per_bfd->storage_obstack, |
| demangled, strlen (demangled))); |
| DW_STRING_IS_CANONICAL (attr) = 1; |
| xfree (demangled); |
| |
| /* Strip any leading namespaces/classes, keep only the base name. |
| DW_AT_name for named DIEs does not contain the prefixes. */ |
| base = strrchr (DW_STRING (attr), ':'); |
| if (base && base > DW_STRING (attr) && base[-1] == ':') |
| return &base[1]; |
| else |
| return DW_STRING (attr); |
| } |
| } |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (!DW_STRING_IS_CANONICAL (attr)) |
| { |
| DW_STRING (attr) |
| = dwarf2_canonicalize_name (DW_STRING (attr), cu, |
| &cu->objfile->per_bfd->storage_obstack); |
| DW_STRING_IS_CANONICAL (attr) = 1; |
| } |
| return DW_STRING (attr); |
| } |
| |
| /* Return the die that this die in an extension of, or NULL if there |
| is none. *EXT_CU is the CU containing DIE on input, and the CU |
| containing the return value on output. */ |
| |
| static struct die_info * |
| dwarf2_extension (struct die_info *die, struct dwarf2_cu **ext_cu) |
| { |
| struct attribute *attr; |
| |
| attr = dwarf2_attr (die, DW_AT_extension, *ext_cu); |
| if (attr == NULL) |
| return NULL; |
| |
| return follow_die_ref (die, attr, ext_cu); |
| } |
| |
| /* Convert a DIE tag into its string name. */ |
| |
| static const char * |
| dwarf_tag_name (unsigned tag) |
| { |
| const char *name = get_DW_TAG_name (tag); |
| |
| if (name == NULL) |
| return "DW_TAG_<unknown>"; |
| |
| return name; |
| } |
| |
| /* Convert a DWARF attribute code into its string name. */ |
| |
| static const char * |
| dwarf_attr_name (unsigned attr) |
| { |
| const char *name; |
| |
| #ifdef MIPS /* collides with DW_AT_HP_block_index */ |
| if (attr == DW_AT_MIPS_fde) |
| return "DW_AT_MIPS_fde"; |
| #else |
| if (attr == DW_AT_HP_block_index) |
| return "DW_AT_HP_block_index"; |
| #endif |
| |
| name = get_DW_AT_name (attr); |
| |
| if (name == NULL) |
| return "DW_AT_<unknown>"; |
| |
| return name; |
| } |
| |
| /* Convert a DWARF value form code into its string name. */ |
| |
| static const char * |
| dwarf_form_name (unsigned form) |
| { |
| const char *name = get_DW_FORM_name (form); |
| |
| if (name == NULL) |
| return "DW_FORM_<unknown>"; |
| |
| return name; |
| } |
| |
| static char * |
| dwarf_bool_name (unsigned mybool) |
| { |
| if (mybool) |
| return "TRUE"; |
| else |
| return "FALSE"; |
| } |
| |
| /* Convert a DWARF type code into its string name. */ |
| |
| static const char * |
| dwarf_type_encoding_name (unsigned enc) |
| { |
| const char *name = get_DW_ATE_name (enc); |
| |
| if (name == NULL) |
| return "DW_ATE_<unknown>"; |
| |
| return name; |
| } |
| |
| static void |
| dump_die_shallow (struct ui_file *f, int indent, struct die_info *die) |
| { |
| unsigned int i; |
| |
| print_spaces (indent, f); |
| fprintf_unfiltered (f, "Die: %s (abbrev %d, offset 0x%x)\n", |
| dwarf_tag_name (die->tag), die->abbrev, die->offset.sect_off); |
| |
| if (die->parent != NULL) |
| { |
| print_spaces (indent, f); |
| fprintf_unfiltered (f, " parent at offset: 0x%x\n", |
| die->parent->offset.sect_off); |
| } |
| |
| print_spaces (indent, f); |
| fprintf_unfiltered (f, " has children: %s\n", |
| dwarf_bool_name (die->child != NULL)); |
| |
| print_spaces (indent, f); |
| fprintf_unfiltered (f, " attributes:\n"); |
| |
| for (i = 0; i < die->num_attrs; ++i) |
| { |
| print_spaces (indent, f); |
| fprintf_unfiltered (f, " %s (%s) ", |
| dwarf_attr_name (die->attrs[i].name), |
| dwarf_form_name (die->attrs[i].form)); |
| |
| switch (die->attrs[i].form) |
| { |
| case DW_FORM_addr: |
| case DW_FORM_GNU_addr_index: |
| fprintf_unfiltered (f, "address: "); |
| fputs_filtered (hex_string (DW_ADDR (&die->attrs[i])), f); |
| break; |
| case DW_FORM_block2: |
| case DW_FORM_block4: |
| case DW_FORM_block: |
| case DW_FORM_block1: |
| fprintf_unfiltered (f, "block: size %s", |
| pulongest (DW_BLOCK (&die->attrs[i])->size)); |
| break; |
| case DW_FORM_exprloc: |
| fprintf_unfiltered (f, "expression: size %s", |
| pulongest (DW_BLOCK (&die->attrs[i])->size)); |
| break; |
| case DW_FORM_ref_addr: |
| fprintf_unfiltered (f, "ref address: "); |
| fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); |
| break; |
| case DW_FORM_GNU_ref_alt: |
| fprintf_unfiltered (f, "alt ref address: "); |
| fputs_filtered (hex_string (DW_UNSND (&die->attrs[i])), f); |
| break; |
| case DW_FORM_ref1: |
| case DW_FORM_ref2: |
| case DW_FORM_ref4: |
| case DW_FORM_ref8: |
| case DW_FORM_ref_udata: |
| fprintf_unfiltered (f, "constant ref: 0x%lx (adjusted)", |
| (long) (DW_UNSND (&die->attrs[i]))); |
| break; |
| case DW_FORM_data1: |
| case DW_FORM_data2: |
| case DW_FORM_data4: |
| case DW_FORM_data8: |
| case DW_FORM_udata: |
| case DW_FORM_sdata: |
| fprintf_unfiltered (f, "constant: %s", |
| pulongest (DW_UNSND (&die->attrs[i]))); |
| break; |
| case DW_FORM_sec_offset: |
| fprintf_unfiltered (f, "section offset: %s", |
| pulongest (DW_UNSND (&die->attrs[i]))); |
| break; |
| case DW_FORM_ref_sig8: |
| fprintf_unfiltered (f, "signature: %s", |
| hex_string (DW_SIGNATURE (&die->attrs[i]))); |
| break; |
| case DW_FORM_string: |
| case DW_FORM_strp: |
| case DW_FORM_GNU_str_index: |
| case DW_FORM_GNU_strp_alt: |
| fprintf_unfiltered (f, "string: \"%s\" (%s canonicalized)", |
| DW_STRING (&die->attrs[i]) |
| ? DW_STRING (&die->attrs[i]) : "", |
| DW_STRING_IS_CANONICAL (&die->attrs[i]) ? "is" : "not"); |
| break; |
| case DW_FORM_flag: |
| if (DW_UNSND (&die->attrs[i])) |
| fprintf_unfiltered (f, "flag: TRUE"); |
| else |
| fprintf_unfiltered (f, "flag: FALSE"); |
| break; |
| case DW_FORM_flag_present: |
| fprintf_unfiltered (f, "flag: TRUE"); |
| break; |
| case DW_FORM_indirect: |
| /* The reader will have reduced the indirect form to |
| the "base form" so this form should not occur. */ |
| fprintf_unfiltered (f, |
| "unexpected attribute form: DW_FORM_indirect"); |
| break; |
| default: |
| fprintf_unfiltered (f, "unsupported attribute form: %d.", |
| die->attrs[i].form); |
| break; |
| } |
| fprintf_unfiltered (f, "\n"); |
| } |
| } |
| |
| static void |
| dump_die_for_error (struct die_info *die) |
| { |
| dump_die_shallow (gdb_stderr, 0, die); |
| } |
| |
| static void |
| dump_die_1 (struct ui_file *f, int level, int max_level, struct die_info *die) |
| { |
| int indent = level * 4; |
| |
| gdb_assert (die != NULL); |
| |
| if (level >= max_level) |
| return; |
| |
| dump_die_shallow (f, indent, die); |
| |
| if (die->child != NULL) |
| { |
| print_spaces (indent, f); |
| fprintf_unfiltered (f, " Children:"); |
| if (level + 1 < max_level) |
| { |
| fprintf_unfiltered (f, "\n"); |
| dump_die_1 (f, level + 1, max_level, die->child); |
| } |
| else |
| { |
| fprintf_unfiltered (f, |
| " [not printed, max nesting level reached]\n"); |
| } |
| } |
| |
| if (die->sibling != NULL && level > 0) |
| { |
| dump_die_1 (f, level, max_level, die->sibling); |
| } |
| } |
| |
| /* This is called from the pdie macro in gdbinit.in. |
| It's not static so gcc will keep a copy callable from gdb. */ |
| |
| void |
| dump_die (struct die_info *die, int max_level) |
| { |
| dump_die_1 (gdb_stdlog, 0, max_level, die); |
| } |
| |
| static void |
| store_in_ref_table (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| void **slot; |
| |
| slot = htab_find_slot_with_hash (cu->die_hash, die, die->offset.sect_off, |
| INSERT); |
| |
| *slot = die; |
| } |
| |
| /* Return DIE offset of ATTR. Return 0 with complaint if ATTR is not of the |
| required kind. */ |
| |
| static sect_offset |
| dwarf2_get_ref_die_offset (const struct attribute *attr) |
| { |
| sect_offset retval = { DW_UNSND (attr) }; |
| |
| if (attr_form_is_ref (attr)) |
| return retval; |
| |
| retval.sect_off = 0; |
| complaint (&symfile_complaints, |
| _("unsupported die ref attribute form: '%s'"), |
| dwarf_form_name (attr->form)); |
| return retval; |
| } |
| |
| /* Return the constant value held by ATTR. Return DEFAULT_VALUE if |
| * the value held by the attribute is not constant. */ |
| |
| static LONGEST |
| dwarf2_get_attr_constant_value (const struct attribute *attr, int default_value) |
| { |
| if (attr->form == DW_FORM_sdata) |
| return DW_SND (attr); |
| else if (attr->form == DW_FORM_udata |
| || attr->form == DW_FORM_data1 |
| || attr->form == DW_FORM_data2 |
| || attr->form == DW_FORM_data4 |
| || attr->form == DW_FORM_data8) |
| return DW_UNSND (attr); |
| else |
| { |
| complaint (&symfile_complaints, |
| _("Attribute value is not a constant (%s)"), |
| dwarf_form_name (attr->form)); |
| return default_value; |
| } |
| } |
| |
| /* Follow reference or signature attribute ATTR of SRC_DIE. |
| On entry *REF_CU is the CU of SRC_DIE. |
| On exit *REF_CU is the CU of the result. */ |
| |
| static struct die_info * |
| follow_die_ref_or_sig (struct die_info *src_die, const struct attribute *attr, |
| struct dwarf2_cu **ref_cu) |
| { |
| struct die_info *die; |
| |
| if (attr_form_is_ref (attr)) |
| die = follow_die_ref (src_die, attr, ref_cu); |
| else if (attr->form == DW_FORM_ref_sig8) |
| die = follow_die_sig (src_die, attr, ref_cu); |
| else |
| { |
| dump_die_for_error (src_die); |
| error (_("Dwarf Error: Expected reference attribute [in module %s]"), |
| objfile_name ((*ref_cu)->objfile)); |
| } |
| |
| return die; |
| } |
| |
| /* Follow reference OFFSET. |
| On entry *REF_CU is the CU of the source die referencing OFFSET. |
| On exit *REF_CU is the CU of the result. |
| Returns NULL if OFFSET is invalid. */ |
| |
| static struct die_info * |
| follow_die_offset (sect_offset offset, int offset_in_dwz, |
| struct dwarf2_cu **ref_cu) |
| { |
| struct die_info temp_die; |
| struct dwarf2_cu *target_cu, *cu = *ref_cu; |
| |
| gdb_assert (cu->per_cu != NULL); |
| |
| target_cu = cu; |
| |
| if (cu->per_cu->is_debug_types) |
| { |
| /* .debug_types CUs cannot reference anything outside their CU. |
| If they need to, they have to reference a signatured type via |
| DW_FORM_ref_sig8. */ |
| if (! offset_in_cu_p (&cu->header, offset)) |
| return NULL; |
| } |
| else if (offset_in_dwz != cu->per_cu->is_dwz |
| || ! offset_in_cu_p (&cu->header, offset)) |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| |
| per_cu = dwarf2_find_containing_comp_unit (offset, offset_in_dwz, |
| cu->objfile); |
| |
| /* If necessary, add it to the queue and load its DIEs. */ |
| if (maybe_queue_comp_unit (cu, per_cu, cu->language)) |
| load_full_comp_unit (per_cu, cu->language); |
| |
| target_cu = per_cu->cu; |
| } |
| else if (cu->dies == NULL) |
| { |
| /* We're loading full DIEs during partial symbol reading. */ |
| gdb_assert (dwarf2_per_objfile->reading_partial_symbols); |
| load_full_comp_unit (cu->per_cu, language_minimal); |
| } |
| |
| *ref_cu = target_cu; |
| temp_die.offset = offset; |
| return (struct die_info *) htab_find_with_hash (target_cu->die_hash, |
| &temp_die, offset.sect_off); |
| } |
| |
| /* Follow reference attribute ATTR of SRC_DIE. |
| On entry *REF_CU is the CU of SRC_DIE. |
| On exit *REF_CU is the CU of the result. */ |
| |
| static struct die_info * |
| follow_die_ref (struct die_info *src_die, const struct attribute *attr, |
| struct dwarf2_cu **ref_cu) |
| { |
| sect_offset offset = dwarf2_get_ref_die_offset (attr); |
| struct dwarf2_cu *cu = *ref_cu; |
| struct die_info *die; |
| |
| die = follow_die_offset (offset, |
| (attr->form == DW_FORM_GNU_ref_alt |
| || cu->per_cu->is_dwz), |
| ref_cu); |
| if (!die) |
| error (_("Dwarf Error: Cannot find DIE at 0x%x referenced from DIE " |
| "at 0x%x [in module %s]"), |
| offset.sect_off, src_die->offset.sect_off, |
| objfile_name (cu->objfile)); |
| |
| return die; |
| } |
| |
| /* Return DWARF block referenced by DW_AT_location of DIE at OFFSET at PER_CU. |
| Returned value is intended for DW_OP_call*. Returned |
| dwarf2_locexpr_baton->data has lifetime of PER_CU->OBJFILE. */ |
| |
| struct dwarf2_locexpr_baton |
| dwarf2_fetch_die_loc_sect_off (sect_offset offset, |
| struct dwarf2_per_cu_data *per_cu, |
| CORE_ADDR (*get_frame_pc) (void *baton), |
| void *baton) |
| { |
| struct dwarf2_cu *cu; |
| struct die_info *die; |
| struct attribute *attr; |
| struct dwarf2_locexpr_baton retval; |
| |
| dw2_setup (per_cu->objfile); |
| |
| if (per_cu->cu == NULL) |
| load_cu (per_cu); |
| cu = per_cu->cu; |
| if (cu == NULL) |
| { |
| /* We shouldn't get here for a dummy CU, but don't crash on the user. |
| Instead just throw an error, not much else we can do. */ |
| error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"), |
| offset.sect_off, objfile_name (per_cu->objfile)); |
| } |
| |
| die = follow_die_offset (offset, per_cu->is_dwz, &cu); |
| if (!die) |
| error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"), |
| offset.sect_off, objfile_name (per_cu->objfile)); |
| |
| attr = dwarf2_attr (die, DW_AT_location, cu); |
| if (!attr) |
| { |
| /* DWARF: "If there is no such attribute, then there is no effect.". |
| DATA is ignored if SIZE is 0. */ |
| |
| retval.data = NULL; |
| retval.size = 0; |
| } |
| else if (attr_form_is_section_offset (attr)) |
| { |
| struct dwarf2_loclist_baton loclist_baton; |
| CORE_ADDR pc = (*get_frame_pc) (baton); |
| size_t size; |
| |
| fill_in_loclist_baton (cu, &loclist_baton, attr); |
| |
| retval.data = dwarf2_find_location_expression (&loclist_baton, |
| &size, pc); |
| retval.size = size; |
| } |
| else |
| { |
| if (!attr_form_is_block (attr)) |
| error (_("Dwarf Error: DIE at 0x%x referenced in module %s " |
| "is neither DW_FORM_block* nor DW_FORM_exprloc"), |
| offset.sect_off, objfile_name (per_cu->objfile)); |
| |
| retval.data = DW_BLOCK (attr)->data; |
| retval.size = DW_BLOCK (attr)->size; |
| } |
| retval.per_cu = cu->per_cu; |
| |
| age_cached_comp_units (); |
| |
| return retval; |
| } |
| |
| /* Like dwarf2_fetch_die_loc_sect_off, but take a CU |
| offset. */ |
| |
| struct dwarf2_locexpr_baton |
| dwarf2_fetch_die_loc_cu_off (cu_offset offset_in_cu, |
| struct dwarf2_per_cu_data *per_cu, |
| CORE_ADDR (*get_frame_pc) (void *baton), |
| void *baton) |
| { |
| sect_offset offset = { per_cu->offset.sect_off + offset_in_cu.cu_off }; |
| |
| return dwarf2_fetch_die_loc_sect_off (offset, per_cu, get_frame_pc, baton); |
| } |
| |
| /* Write a constant of a given type as target-ordered bytes into |
| OBSTACK. */ |
| |
| static const gdb_byte * |
| write_constant_as_bytes (struct obstack *obstack, |
| enum bfd_endian byte_order, |
| struct type *type, |
| ULONGEST value, |
| LONGEST *len) |
| { |
| gdb_byte *result; |
| |
| *len = TYPE_LENGTH (type); |
| result = (gdb_byte *) obstack_alloc (obstack, *len); |
| store_unsigned_integer (result, *len, byte_order, value); |
| |
| return result; |
| } |
| |
| /* If the DIE at OFFSET in PER_CU has a DW_AT_const_value, return a |
| pointer to the constant bytes and set LEN to the length of the |
| data. If memory is needed, allocate it on OBSTACK. If the DIE |
| does not have a DW_AT_const_value, return NULL. */ |
| |
| const gdb_byte * |
| dwarf2_fetch_constant_bytes (sect_offset offset, |
| struct dwarf2_per_cu_data *per_cu, |
| struct obstack *obstack, |
| LONGEST *len) |
| { |
| struct dwarf2_cu *cu; |
| struct die_info *die; |
| struct attribute *attr; |
| const gdb_byte *result = NULL; |
| struct type *type; |
| LONGEST value; |
| enum bfd_endian byte_order; |
| |
| dw2_setup (per_cu->objfile); |
| |
| if (per_cu->cu == NULL) |
| load_cu (per_cu); |
| cu = per_cu->cu; |
| if (cu == NULL) |
| { |
| /* We shouldn't get here for a dummy CU, but don't crash on the user. |
| Instead just throw an error, not much else we can do. */ |
| error (_("Dwarf Error: Dummy CU at 0x%x referenced in module %s"), |
| offset.sect_off, objfile_name (per_cu->objfile)); |
| } |
| |
| die = follow_die_offset (offset, per_cu->is_dwz, &cu); |
| if (!die) |
| error (_("Dwarf Error: Cannot find DIE at 0x%x referenced in module %s"), |
| offset.sect_off, objfile_name (per_cu->objfile)); |
| |
| |
| attr = dwarf2_attr (die, DW_AT_const_value, cu); |
| if (attr == NULL) |
| return NULL; |
| |
| byte_order = (bfd_big_endian (per_cu->objfile->obfd) |
| ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE); |
| |
| switch (attr->form) |
| { |
| case DW_FORM_addr: |
| case DW_FORM_GNU_addr_index: |
| { |
| gdb_byte *tem; |
| |
| *len = cu->header.addr_size; |
| tem = (gdb_byte *) obstack_alloc (obstack, *len); |
| store_unsigned_integer (tem, *len, byte_order, DW_ADDR (attr)); |
| result = tem; |
| } |
| break; |
| case DW_FORM_string: |
| case DW_FORM_strp: |
| case DW_FORM_GNU_str_index: |
| case DW_FORM_GNU_strp_alt: |
| /* DW_STRING is already allocated on the objfile obstack, point |
| directly to it. */ |
| result = (const gdb_byte *) DW_STRING (attr); |
| *len = strlen (DW_STRING (attr)); |
| break; |
| case DW_FORM_block1: |
| case DW_FORM_block2: |
| case DW_FORM_block4: |
| case DW_FORM_block: |
| case DW_FORM_exprloc: |
| result = DW_BLOCK (attr)->data; |
| *len = DW_BLOCK (attr)->size; |
| break; |
| |
| /* The DW_AT_const_value attributes are supposed to carry the |
| symbol's value "represented as it would be on the target |
| architecture." By the time we get here, it's already been |
| converted to host endianness, so we just need to sign- or |
| zero-extend it as appropriate. */ |
| case DW_FORM_data1: |
| type = die_type (die, cu); |
| result = dwarf2_const_value_data (attr, obstack, cu, &value, 8); |
| if (result == NULL) |
| result = write_constant_as_bytes (obstack, byte_order, |
| type, value, len); |
| break; |
| case DW_FORM_data2: |
| type = die_type (die, cu); |
| result = dwarf2_const_value_data (attr, obstack, cu, &value, 16); |
| if (result == NULL) |
| result = write_constant_as_bytes (obstack, byte_order, |
| type, value, len); |
| break; |
| case DW_FORM_data4: |
| type = die_type (die, cu); |
| result = dwarf2_const_value_data (attr, obstack, cu, &value, 32); |
| if (result == NULL) |
| result = write_constant_as_bytes (obstack, byte_order, |
| type, value, len); |
| break; |
| case DW_FORM_data8: |
| type = die_type (die, cu); |
| result = dwarf2_const_value_data (attr, obstack, cu, &value, 64); |
| if (result == NULL) |
| result = write_constant_as_bytes (obstack, byte_order, |
| type, value, len); |
| break; |
| |
| case DW_FORM_sdata: |
| type = die_type (die, cu); |
| result = write_constant_as_bytes (obstack, byte_order, |
| type, DW_SND (attr), len); |
| break; |
| |
| case DW_FORM_udata: |
| type = die_type (die, cu); |
| result = write_constant_as_bytes (obstack, byte_order, |
| type, DW_UNSND (attr), len); |
| break; |
| |
| default: |
| complaint (&symfile_complaints, |
| _("unsupported const value attribute form: '%s'"), |
| dwarf_form_name (attr->form)); |
| break; |
| } |
| |
| return result; |
| } |
| |
| /* Return the type of the DIE at DIE_OFFSET in the CU named by |
| PER_CU. */ |
| |
| struct type * |
| dwarf2_get_die_type (cu_offset die_offset, |
| struct dwarf2_per_cu_data *per_cu) |
| { |
| sect_offset die_offset_sect; |
| |
| dw2_setup (per_cu->objfile); |
| |
| die_offset_sect.sect_off = per_cu->offset.sect_off + die_offset.cu_off; |
| return get_die_type_at_offset (die_offset_sect, per_cu); |
| } |
| |
| /* Follow type unit SIG_TYPE referenced by SRC_DIE. |
| On entry *REF_CU is the CU of SRC_DIE. |
| On exit *REF_CU is the CU of the result. |
| Returns NULL if the referenced DIE isn't found. */ |
| |
| static struct die_info * |
| follow_die_sig_1 (struct die_info *src_die, struct signatured_type *sig_type, |
| struct dwarf2_cu **ref_cu) |
| { |
| struct die_info temp_die; |
| struct dwarf2_cu *sig_cu; |
| struct die_info *die; |
| |
| /* While it might be nice to assert sig_type->type == NULL here, |
| we can get here for DW_AT_imported_declaration where we need |
| the DIE not the type. */ |
| |
| /* If necessary, add it to the queue and load its DIEs. */ |
| |
| if (maybe_queue_comp_unit (*ref_cu, &sig_type->per_cu, language_minimal)) |
| read_signatured_type (sig_type); |
| |
| sig_cu = sig_type->per_cu.cu; |
| gdb_assert (sig_cu != NULL); |
| gdb_assert (sig_type->type_offset_in_section.sect_off != 0); |
| temp_die.offset = sig_type->type_offset_in_section; |
| die = (struct die_info *) htab_find_with_hash (sig_cu->die_hash, &temp_die, |
| temp_die.offset.sect_off); |
| if (die) |
| { |
| /* For .gdb_index version 7 keep track of included TUs. |
| http://sourceware.org/bugzilla/show_bug.cgi?id=15021. */ |
| if (dwarf2_per_objfile->index_table != NULL |
| && dwarf2_per_objfile->index_table->version <= 7) |
| { |
| VEC_safe_push (dwarf2_per_cu_ptr, |
| (*ref_cu)->per_cu->imported_symtabs, |
| sig_cu->per_cu); |
| } |
| |
| *ref_cu = sig_cu; |
| return die; |
| } |
| |
| return NULL; |
| } |
| |
| /* Follow signatured type referenced by ATTR in SRC_DIE. |
| On entry *REF_CU is the CU of SRC_DIE. |
| On exit *REF_CU is the CU of the result. |
| The result is the DIE of the type. |
| If the referenced type cannot be found an error is thrown. */ |
| |
| static struct die_info * |
| follow_die_sig (struct die_info *src_die, const struct attribute *attr, |
| struct dwarf2_cu **ref_cu) |
| { |
| ULONGEST signature = DW_SIGNATURE (attr); |
| struct signatured_type *sig_type; |
| struct die_info *die; |
| |
| gdb_assert (attr->form == DW_FORM_ref_sig8); |
| |
| sig_type = lookup_signatured_type (*ref_cu, signature); |
| /* sig_type will be NULL if the signatured type is missing from |
| the debug info. */ |
| if (sig_type == NULL) |
| { |
| error (_("Dwarf Error: Cannot find signatured DIE %s referenced" |
| " from DIE at 0x%x [in module %s]"), |
| hex_string (signature), src_die->offset.sect_off, |
| objfile_name ((*ref_cu)->objfile)); |
| } |
| |
| die = follow_die_sig_1 (src_die, sig_type, ref_cu); |
| if (die == NULL) |
| { |
| dump_die_for_error (src_die); |
| error (_("Dwarf Error: Problem reading signatured DIE %s referenced" |
| " from DIE at 0x%x [in module %s]"), |
| hex_string (signature), src_die->offset.sect_off, |
| objfile_name ((*ref_cu)->objfile)); |
| } |
| |
| return die; |
| } |
| |
| /* Get the type specified by SIGNATURE referenced in DIE/CU, |
| reading in and processing the type unit if necessary. */ |
| |
| static struct type * |
| get_signatured_type (struct die_info *die, ULONGEST signature, |
| struct dwarf2_cu *cu) |
| { |
| struct signatured_type *sig_type; |
| struct dwarf2_cu *type_cu; |
| struct die_info *type_die; |
| struct type *type; |
| |
| sig_type = lookup_signatured_type (cu, signature); |
| /* sig_type will be NULL if the signatured type is missing from |
| the debug info. */ |
| if (sig_type == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("Dwarf Error: Cannot find signatured DIE %s referenced" |
| " from DIE at 0x%x [in module %s]"), |
| hex_string (signature), die->offset.sect_off, |
| objfile_name (dwarf2_per_objfile->objfile)); |
| return build_error_marker_type (cu, die); |
| } |
| |
| /* If we already know the type we're done. */ |
| if (sig_type->type != NULL) |
| return sig_type->type; |
| |
| type_cu = cu; |
| type_die = follow_die_sig_1 (die, sig_type, &type_cu); |
| if (type_die != NULL) |
| { |
| /* N.B. We need to call get_die_type to ensure only one type for this DIE |
| is created. This is important, for example, because for c++ classes |
| we need TYPE_NAME set which is only done by new_symbol. Blech. */ |
| type = read_type_die (type_die, type_cu); |
| if (type == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("Dwarf Error: Cannot build signatured type %s" |
| " referenced from DIE at 0x%x [in module %s]"), |
| hex_string (signature), die->offset.sect_off, |
| objfile_name (dwarf2_per_objfile->objfile)); |
| type = build_error_marker_type (cu, die); |
| } |
| } |
| else |
| { |
| complaint (&symfile_complaints, |
| _("Dwarf Error: Problem reading signatured DIE %s referenced" |
| " from DIE at 0x%x [in module %s]"), |
| hex_string (signature), die->offset.sect_off, |
| objfile_name (dwarf2_per_objfile->objfile)); |
| type = build_error_marker_type (cu, die); |
| } |
| sig_type->type = type; |
| |
| return type; |
| } |
| |
| /* Get the type specified by the DW_AT_signature ATTR in DIE/CU, |
| reading in and processing the type unit if necessary. */ |
| |
| static struct type * |
| get_DW_AT_signature_type (struct die_info *die, const struct attribute *attr, |
| struct dwarf2_cu *cu) /* ARI: editCase function */ |
| { |
| /* Yes, DW_AT_signature can use a non-ref_sig8 reference. */ |
| if (attr_form_is_ref (attr)) |
| { |
| struct dwarf2_cu *type_cu = cu; |
| struct die_info *type_die = follow_die_ref (die, attr, &type_cu); |
| |
| return read_type_die (type_die, type_cu); |
| } |
| else if (attr->form == DW_FORM_ref_sig8) |
| { |
| return get_signatured_type (die, DW_SIGNATURE (attr), cu); |
| } |
| else |
| { |
| complaint (&symfile_complaints, |
| _("Dwarf Error: DW_AT_signature has bad form %s in DIE" |
| " at 0x%x [in module %s]"), |
| dwarf_form_name (attr->form), die->offset.sect_off, |
| objfile_name (dwarf2_per_objfile->objfile)); |
| return build_error_marker_type (cu, die); |
| } |
| } |
| |
| /* Load the DIEs associated with type unit PER_CU into memory. */ |
| |
| static void |
| load_full_type_unit (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct signatured_type *sig_type; |
| |
| /* Caller is responsible for ensuring type_unit_groups don't get here. */ |
| gdb_assert (! IS_TYPE_UNIT_GROUP (per_cu)); |
| |
| /* We have the per_cu, but we need the signatured_type. |
| Fortunately this is an easy translation. */ |
| gdb_assert (per_cu->is_debug_types); |
| sig_type = (struct signatured_type *) per_cu; |
| |
| gdb_assert (per_cu->cu == NULL); |
| |
| read_signatured_type (sig_type); |
| |
| gdb_assert (per_cu->cu != NULL); |
| } |
| |
| /* die_reader_func for read_signatured_type. |
| This is identical to load_full_comp_unit_reader, |
| but is kept separate for now. */ |
| |
| static void |
| read_signatured_type_reader (const struct die_reader_specs *reader, |
| const gdb_byte *info_ptr, |
| struct die_info *comp_unit_die, |
| int has_children, |
| void *data) |
| { |
| struct dwarf2_cu *cu = reader->cu; |
| |
| gdb_assert (cu->die_hash == NULL); |
| cu->die_hash = |
| htab_create_alloc_ex (cu->header.length / 12, |
| die_hash, |
| die_eq, |
| NULL, |
| &cu->comp_unit_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| |
| if (has_children) |
| comp_unit_die->child = read_die_and_siblings (reader, info_ptr, |
| &info_ptr, comp_unit_die); |
| cu->dies = comp_unit_die; |
| /* comp_unit_die is not stored in die_hash, no need. */ |
| |
| /* We try not to read any attributes in this function, because not |
| all CUs needed for references have been loaded yet, and symbol |
| table processing isn't initialized. But we have to set the CU language, |
| or we won't be able to build types correctly. |
| Similarly, if we do not read the producer, we can not apply |
| producer-specific interpretation. */ |
| prepare_one_comp_unit (cu, cu->dies, language_minimal); |
| } |
| |
| /* Read in a signatured type and build its CU and DIEs. |
| If the type is a stub for the real type in a DWO file, |
| read in the real type from the DWO file as well. */ |
| |
| static void |
| read_signatured_type (struct signatured_type *sig_type) |
| { |
| struct dwarf2_per_cu_data *per_cu = &sig_type->per_cu; |
| |
| gdb_assert (per_cu->is_debug_types); |
| gdb_assert (per_cu->cu == NULL); |
| |
| init_cutu_and_read_dies (per_cu, NULL, 0, 1, |
| read_signatured_type_reader, NULL); |
| sig_type->per_cu.tu_read = 1; |
| } |
| |
| /* Decode simple location descriptions. |
| Given a pointer to a dwarf block that defines a location, compute |
| the location and return the value. |
| |
| NOTE drow/2003-11-18: This function is called in two situations |
| now: for the address of static or global variables (partial symbols |
| only) and for offsets into structures which are expected to be |
| (more or less) constant. The partial symbol case should go away, |
| and only the constant case should remain. That will let this |
| function complain more accurately. A few special modes are allowed |
| without complaint for global variables (for instance, global |
| register values and thread-local values). |
| |
| A location description containing no operations indicates that the |
| object is optimized out. The return value is 0 for that case. |
| FIXME drow/2003-11-16: No callers check for this case any more; soon all |
| callers will only want a very basic result and this can become a |
| complaint. |
| |
| Note that stack[0] is unused except as a default error return. */ |
| |
| static CORE_ADDR |
| decode_locdesc (struct dwarf_block *blk, struct dwarf2_cu *cu) |
| { |
| struct objfile *objfile = cu->objfile; |
| size_t i; |
| size_t size = blk->size; |
| const gdb_byte *data = blk->data; |
| CORE_ADDR stack[64]; |
| int stacki; |
| unsigned int bytes_read, unsnd; |
| gdb_byte op; |
| |
| i = 0; |
| stacki = 0; |
| stack[stacki] = 0; |
| stack[++stacki] = 0; |
| |
| while (i < size) |
| { |
| op = data[i++]; |
| switch (op) |
| { |
| case DW_OP_lit0: |
| case DW_OP_lit1: |
| case DW_OP_lit2: |
| case DW_OP_lit3: |
| case DW_OP_lit4: |
| case DW_OP_lit5: |
| case DW_OP_lit6: |
| case DW_OP_lit7: |
| case DW_OP_lit8: |
| case DW_OP_lit9: |
| case DW_OP_lit10: |
| case DW_OP_lit11: |
| case DW_OP_lit12: |
| case DW_OP_lit13: |
| case DW_OP_lit14: |
| case DW_OP_lit15: |
| case DW_OP_lit16: |
| case DW_OP_lit17: |
| case DW_OP_lit18: |
| case DW_OP_lit19: |
| case DW_OP_lit20: |
| case DW_OP_lit21: |
| case DW_OP_lit22: |
| case DW_OP_lit23: |
| case DW_OP_lit24: |
| case DW_OP_lit25: |
| case DW_OP_lit26: |
| case DW_OP_lit27: |
| case DW_OP_lit28: |
| case DW_OP_lit29: |
| case DW_OP_lit30: |
| case DW_OP_lit31: |
| stack[++stacki] = op - DW_OP_lit0; |
| break; |
| |
| case DW_OP_reg0: |
| case DW_OP_reg1: |
| case DW_OP_reg2: |
| case DW_OP_reg3: |
| case DW_OP_reg4: |
| case DW_OP_reg5: |
| case DW_OP_reg6: |
| case DW_OP_reg7: |
| case DW_OP_reg8: |
| case DW_OP_reg9: |
| case DW_OP_reg10: |
| case DW_OP_reg11: |
| case DW_OP_reg12: |
| case DW_OP_reg13: |
| case DW_OP_reg14: |
| case DW_OP_reg15: |
| case DW_OP_reg16: |
| case DW_OP_reg17: |
| case DW_OP_reg18: |
| case DW_OP_reg19: |
| case DW_OP_reg20: |
| case DW_OP_reg21: |
| case DW_OP_reg22: |
| case DW_OP_reg23: |
| case DW_OP_reg24: |
| case DW_OP_reg25: |
| case DW_OP_reg26: |
| case DW_OP_reg27: |
| case DW_OP_reg28: |
| case DW_OP_reg29: |
| case DW_OP_reg30: |
| case DW_OP_reg31: |
| stack[++stacki] = op - DW_OP_reg0; |
| if (i < size) |
| dwarf2_complex_location_expr_complaint (); |
| break; |
| |
| case DW_OP_regx: |
| unsnd = read_unsigned_leb128 (NULL, (data + i), &bytes_read); |
| i += bytes_read; |
| stack[++stacki] = unsnd; |
| if (i < size) |
| dwarf2_complex_location_expr_complaint (); |
| break; |
| |
| case DW_OP_addr: |
| stack[++stacki] = read_address (objfile->obfd, &data[i], |
| cu, &bytes_read); |
| i += bytes_read; |
| break; |
| |
| case DW_OP_const1u: |
| stack[++stacki] = read_1_byte (objfile->obfd, &data[i]); |
| i += 1; |
| break; |
| |
| case DW_OP_const1s: |
| stack[++stacki] = read_1_signed_byte (objfile->obfd, &data[i]); |
| i += 1; |
| break; |
| |
| case DW_OP_const2u: |
| stack[++stacki] = read_2_bytes (objfile->obfd, &data[i]); |
| i += 2; |
| break; |
| |
| case DW_OP_const2s: |
| stack[++stacki] = read_2_signed_bytes (objfile->obfd, &data[i]); |
| i += 2; |
| break; |
| |
| case DW_OP_const4u: |
| stack[++stacki] = read_4_bytes (objfile->obfd, &data[i]); |
| i += 4; |
| break; |
| |
| case DW_OP_const4s: |
| stack[++stacki] = read_4_signed_bytes (objfile->obfd, &data[i]); |
| i += 4; |
| break; |
| |
| case DW_OP_const8u: |
| stack[++stacki] = read_8_bytes (objfile->obfd, &data[i]); |
| i += 8; |
| break; |
| |
| case DW_OP_constu: |
| stack[++stacki] = read_unsigned_leb128 (NULL, (data + i), |
| &bytes_read); |
| i += bytes_read; |
| break; |
| |
| case DW_OP_consts: |
| stack[++stacki] = read_signed_leb128 (NULL, (data + i), &bytes_read); |
| i += bytes_read; |
| break; |
| |
| case DW_OP_dup: |
| stack[stacki + 1] = stack[stacki]; |
| stacki++; |
| break; |
| |
| case DW_OP_plus: |
| stack[stacki - 1] += stack[stacki]; |
| stacki--; |
| break; |
| |
| case DW_OP_plus_uconst: |
| stack[stacki] += read_unsigned_leb128 (NULL, (data + i), |
| &bytes_read); |
| i += bytes_read; |
| break; |
| |
| case DW_OP_minus: |
| stack[stacki - 1] -= stack[stacki]; |
| stacki--; |
| break; |
| |
| case DW_OP_deref: |
| /* If we're not the last op, then we definitely can't encode |
| this using GDB's address_class enum. This is valid for partial |
| global symbols, although the variable's address will be bogus |
| in the psymtab. */ |
| if (i < size) |
| dwarf2_complex_location_expr_complaint (); |
| break; |
| |
| case DW_OP_GNU_push_tls_address: |
| case DW_OP_form_tls_address: |
| /* The top of the stack has the offset from the beginning |
| of the thread control block at which the variable is located. */ |
| /* Nothing should follow this operator, so the top of stack would |
| be returned. */ |
| /* This is valid for partial global symbols, but the variable's |
| address will be bogus in the psymtab. Make it always at least |
| non-zero to not look as a variable garbage collected by linker |
| which have DW_OP_addr 0. */ |
| if (i < size) |
| dwarf2_complex_location_expr_complaint (); |
| stack[stacki]++; |
| break; |
| |
| case DW_OP_GNU_uninit: |
| break; |
| |
| case DW_OP_GNU_addr_index: |
| case DW_OP_GNU_const_index: |
| stack[++stacki] = read_addr_index_from_leb128 (cu, &data[i], |
| &bytes_read); |
| i += bytes_read; |
| break; |
| |
| default: |
| { |
| const char *name = get_DW_OP_name (op); |
| |
| if (name) |
| complaint (&symfile_complaints, _("unsupported stack op: '%s'"), |
| name); |
| else |
| complaint (&symfile_complaints, _("unsupported stack op: '%02x'"), |
| op); |
| } |
| |
| return (stack[stacki]); |
| } |
| |
| /* Enforce maximum stack depth of SIZE-1 to avoid writing |
| outside of the allocated space. Also enforce minimum>0. */ |
| if (stacki >= ARRAY_SIZE (stack) - 1) |
| { |
| complaint (&symfile_complaints, |
| _("location description stack overflow")); |
| return 0; |
| } |
| |
| if (stacki <= 0) |
| { |
| complaint (&symfile_complaints, |
| _("location description stack underflow")); |
| return 0; |
| } |
| } |
| return (stack[stacki]); |
| } |
| |
| /* memory allocation interface */ |
| |
| static struct dwarf_block * |
| dwarf_alloc_block (struct dwarf2_cu *cu) |
| { |
| return XOBNEW (&cu->comp_unit_obstack, struct dwarf_block); |
| } |
| |
| static struct die_info * |
| dwarf_alloc_die (struct dwarf2_cu *cu, int num_attrs) |
| { |
| struct die_info *die; |
| size_t size = sizeof (struct die_info); |
| |
| if (num_attrs > 1) |
| size += (num_attrs - 1) * sizeof (struct attribute); |
| |
| die = (struct die_info *) obstack_alloc (&cu->comp_unit_obstack, size); |
| memset (die, 0, sizeof (struct die_info)); |
| return (die); |
| } |
| |
| |
| /* Macro support. */ |
| |
| /* Return file name relative to the compilation directory of file number I in |
| *LH's file name table. The result is allocated using xmalloc; the caller is |
| responsible for freeing it. */ |
| |
| static char * |
| file_file_name (int file, struct line_header *lh) |
| { |
| /* Is the file number a valid index into the line header's file name |
| table? Remember that file numbers start with one, not zero. */ |
| if (1 <= file && file <= lh->num_file_names) |
| { |
| struct file_entry *fe = &lh->file_names[file - 1]; |
| |
| if (IS_ABSOLUTE_PATH (fe->name) || fe->dir_index == 0 |
| || lh->include_dirs == NULL) |
| return xstrdup (fe->name); |
| return concat (lh->include_dirs[fe->dir_index - 1], SLASH_STRING, |
| fe->name, (char *) NULL); |
| } |
| else |
| { |
| /* The compiler produced a bogus file number. We can at least |
| record the macro definitions made in the file, even if we |
| won't be able to find the file by name. */ |
| char fake_name[80]; |
| |
| xsnprintf (fake_name, sizeof (fake_name), |
| "<bad macro file number %d>", file); |
| |
| complaint (&symfile_complaints, |
| _("bad file number in macro information (%d)"), |
| file); |
| |
| return xstrdup (fake_name); |
| } |
| } |
| |
| /* Return the full name of file number I in *LH's file name table. |
| Use COMP_DIR as the name of the current directory of the |
| compilation. The result is allocated using xmalloc; the caller is |
| responsible for freeing it. */ |
| static char * |
| file_full_name (int file, struct line_header *lh, const char *comp_dir) |
| { |
| /* Is the file number a valid index into the line header's file name |
| table? Remember that file numbers start with one, not zero. */ |
| if (1 <= file && file <= lh->num_file_names) |
| { |
| char *relative = file_file_name (file, lh); |
| |
| if (IS_ABSOLUTE_PATH (relative) || comp_dir == NULL) |
| return relative; |
| return reconcat (relative, comp_dir, SLASH_STRING, |
| relative, (char *) NULL); |
| } |
| else |
| return file_file_name (file, lh); |
| } |
| |
| |
| static struct macro_source_file * |
| macro_start_file (int file, int line, |
| struct macro_source_file *current_file, |
| struct line_header *lh) |
| { |
| /* File name relative to the compilation directory of this source file. */ |
| char *file_name = file_file_name (file, lh); |
| |
| if (! current_file) |
| { |
| /* Note: We don't create a macro table for this compilation unit |
| at all until we actually get a filename. */ |
| struct macro_table *macro_table = get_macro_table (); |
| |
| /* If we have no current file, then this must be the start_file |
| directive for the compilation unit's main source file. */ |
| current_file = macro_set_main (macro_table, file_name); |
| macro_define_special (macro_table); |
| } |
| else |
| current_file = macro_include (current_file, line, file_name); |
| |
| xfree (file_name); |
| |
| return current_file; |
| } |
| |
| |
| /* Copy the LEN characters at BUF to a xmalloc'ed block of memory, |
| followed by a null byte. */ |
| static char * |
| copy_string (const char *buf, int len) |
| { |
| char *s = (char *) xmalloc (len + 1); |
| |
| memcpy (s, buf, len); |
| s[len] = '\0'; |
| return s; |
| } |
| |
| |
| static const char * |
| consume_improper_spaces (const char *p, const char *body) |
| { |
| if (*p == ' ') |
| { |
| complaint (&symfile_complaints, |
| _("macro definition contains spaces " |
| "in formal argument list:\n`%s'"), |
| body); |
| |
| while (*p == ' ') |
| p++; |
| } |
| |
| return p; |
| } |
| |
| |
| static void |
| parse_macro_definition (struct macro_source_file *file, int line, |
| const char *body) |
| { |
| const char *p; |
| |
| /* The body string takes one of two forms. For object-like macro |
| definitions, it should be: |
| |
| <macro name> " " <definition> |
| |
| For function-like macro definitions, it should be: |
| |
| <macro name> "() " <definition> |
| or |
| <macro name> "(" <arg name> ( "," <arg name> ) * ") " <definition> |
| |
| Spaces may appear only where explicitly indicated, and in the |
| <definition>. |
| |
| The Dwarf 2 spec says that an object-like macro's name is always |
| followed by a space, but versions of GCC around March 2002 omit |
| the space when the macro's definition is the empty string. |
| |
| The Dwarf 2 spec says that there should be no spaces between the |
| formal arguments in a function-like macro's formal argument list, |
| but versions of GCC around March 2002 include spaces after the |
| commas. */ |
| |
| |
| /* Find the extent of the macro name. The macro name is terminated |
| by either a space or null character (for an object-like macro) or |
| an opening paren (for a function-like macro). */ |
| for (p = body; *p; p++) |
| if (*p == ' ' || *p == '(') |
| break; |
| |
| if (*p == ' ' || *p == '\0') |
| { |
| /* It's an object-like macro. */ |
| int name_len = p - body; |
| char *name = copy_string (body, name_len); |
| const char *replacement; |
| |
| if (*p == ' ') |
| replacement = body + name_len + 1; |
| else |
| { |
| dwarf2_macro_malformed_definition_complaint (body); |
| replacement = body + name_len; |
| } |
| |
| macro_define_object (file, line, name, replacement); |
| |
| xfree (name); |
| } |
| else if (*p == '(') |
| { |
| /* It's a function-like macro. */ |
| char *name = copy_string (body, p - body); |
| int argc = 0; |
| int argv_size = 1; |
| char **argv = XNEWVEC (char *, argv_size); |
| |
| p++; |
| |
| p = consume_improper_spaces (p, body); |
| |
| /* Parse the formal argument list. */ |
| while (*p && *p != ')') |
| { |
| /* Find the extent of the current argument name. */ |
| const char *arg_start = p; |
| |
| while (*p && *p != ',' && *p != ')' && *p != ' ') |
| p++; |
| |
| if (! *p || p == arg_start) |
| dwarf2_macro_malformed_definition_complaint (body); |
| else |
| { |
| /* Make sure argv has room for the new argument. */ |
| if (argc >= argv_size) |
| { |
| argv_size *= 2; |
| argv = XRESIZEVEC (char *, argv, argv_size); |
| } |
| |
| argv[argc++] = copy_string (arg_start, p - arg_start); |
| } |
| |
| p = consume_improper_spaces (p, body); |
| |
| /* Consume the comma, if present. */ |
| if (*p == ',') |
| { |
| p++; |
| |
| p = consume_improper_spaces (p, body); |
| } |
| } |
| |
| if (*p == ')') |
| { |
| p++; |
| |
| if (*p == ' ') |
| /* Perfectly formed definition, no complaints. */ |
| macro_define_function (file, line, name, |
| argc, (const char **) argv, |
| p + 1); |
| else if (*p == '\0') |
| { |
| /* Complain, but do define it. */ |
| dwarf2_macro_malformed_definition_complaint (body); |
| macro_define_function (file, line, name, |
| argc, (const char **) argv, |
| p); |
| } |
| else |
| /* Just complain. */ |
| dwarf2_macro_malformed_definition_complaint (body); |
| } |
| else |
| /* Just complain. */ |
| dwarf2_macro_malformed_definition_complaint (body); |
| |
| xfree (name); |
| { |
| int i; |
| |
| for (i = 0; i < argc; i++) |
| xfree (argv[i]); |
| } |
| xfree (argv); |
| } |
| else |
| dwarf2_macro_malformed_definition_complaint (body); |
| } |
| |
| /* Skip some bytes from BYTES according to the form given in FORM. |
| Returns the new pointer. */ |
| |
| static const gdb_byte * |
| skip_form_bytes (bfd *abfd, const gdb_byte *bytes, const gdb_byte *buffer_end, |
| enum dwarf_form form, |
| unsigned int offset_size, |
| struct dwarf2_section_info *section) |
| { |
| unsigned int bytes_read; |
| |
| switch (form) |
| { |
| case DW_FORM_data1: |
| case DW_FORM_flag: |
| ++bytes; |
| break; |
| |
| case DW_FORM_data2: |
| bytes += 2; |
| break; |
| |
| case DW_FORM_data4: |
| bytes += 4; |
| break; |
| |
| case DW_FORM_data8: |
| bytes += 8; |
| break; |
| |
| case DW_FORM_string: |
| read_direct_string (abfd, bytes, &bytes_read); |
| bytes += bytes_read; |
| break; |
| |
| case DW_FORM_sec_offset: |
| case DW_FORM_strp: |
| case DW_FORM_GNU_strp_alt: |
| bytes += offset_size; |
| break; |
| |
| case DW_FORM_block: |
| bytes += read_unsigned_leb128 (abfd, bytes, &bytes_read); |
| bytes += bytes_read; |
| break; |
| |
| case DW_FORM_block1: |
| bytes += 1 + read_1_byte (abfd, bytes); |
| break; |
| case DW_FORM_block2: |
| bytes += 2 + read_2_bytes (abfd, bytes); |
| break; |
| case DW_FORM_block4: |
| bytes += 4 + read_4_bytes (abfd, bytes); |
| break; |
| |
| case DW_FORM_sdata: |
| case DW_FORM_udata: |
| case DW_FORM_GNU_addr_index: |
| case DW_FORM_GNU_str_index: |
| bytes = gdb_skip_leb128 (bytes, buffer_end); |
| if (bytes == NULL) |
| { |
| dwarf2_section_buffer_overflow_complaint (section); |
| return NULL; |
| } |
| break; |
| |
| default: |
| { |
| complain: |
| complaint (&symfile_complaints, |
| _("invalid form 0x%x in `%s'"), |
| form, get_section_name (section)); |
| return NULL; |
| } |
| } |
| |
| return bytes; |
| } |
| |
| /* A helper for dwarf_decode_macros that handles skipping an unknown |
| opcode. Returns an updated pointer to the macro data buffer; or, |
| on error, issues a complaint and returns NULL. */ |
| |
| static const gdb_byte * |
| skip_unknown_opcode (unsigned int opcode, |
| const gdb_byte **opcode_definitions, |
| const gdb_byte *mac_ptr, const gdb_byte *mac_end, |
| bfd *abfd, |
| unsigned int offset_size, |
| struct dwarf2_section_info *section) |
| { |
| unsigned int bytes_read, i; |
| unsigned long arg; |
| const gdb_byte *defn; |
| |
| if (opcode_definitions[opcode] == NULL) |
| { |
| complaint (&symfile_complaints, |
| _("unrecognized DW_MACFINO opcode 0x%x"), |
| opcode); |
| return NULL; |
| } |
| |
| defn = opcode_definitions[opcode]; |
| arg = read_unsigned_leb128 (abfd, defn, &bytes_read); |
| defn += bytes_read; |
| |
| for (i = 0; i < arg; ++i) |
| { |
| mac_ptr = skip_form_bytes (abfd, mac_ptr, mac_end, |
| (enum dwarf_form) defn[i], offset_size, |
| section); |
| if (mac_ptr == NULL) |
| { |
| /* skip_form_bytes already issued the complaint. */ |
| return NULL; |
| } |
| } |
| |
| return mac_ptr; |
| } |
| |
| /* A helper function which parses the header of a macro section. |
| If the macro section is the extended (for now called "GNU") type, |
| then this updates *OFFSET_SIZE. Returns a pointer to just after |
| the header, or issues a complaint and returns NULL on error. */ |
| |
| static const gdb_byte * |
| dwarf_parse_macro_header (const gdb_byte **opcode_definitions, |
| bfd *abfd, |
| const gdb_byte *mac_ptr, |
| unsigned int *offset_size, |
| int section_is_gnu) |
| { |
| memset (opcode_definitions, 0, 256 * sizeof (gdb_byte *)); |
| |
| if (section_is_gnu) |
| { |
| unsigned int version, flags; |
| |
| version = read_2_bytes (abfd, mac_ptr); |
| if (version != 4) |
| { |
| complaint (&symfile_complaints, |
| _("unrecognized version `%d' in .debug_macro section"), |
| version); |
| return NULL; |
| } |
| mac_ptr += 2; |
| |
| flags = read_1_byte (abfd, mac_ptr); |
| ++mac_ptr; |
| *offset_size = (flags & 1) ? 8 : 4; |
| |
| if ((flags & 2) != 0) |
| /* We don't need the line table offset. */ |
| mac_ptr += *offset_size; |
| |
| /* Vendor opcode descriptions. */ |
| if ((flags & 4) != 0) |
| { |
| unsigned int i, count; |
| |
| count = read_1_byte (abfd, mac_ptr); |
| ++mac_ptr; |
| for (i = 0; i < count; ++i) |
| { |
| unsigned int opcode, bytes_read; |
| unsigned long arg; |
| |
| opcode = read_1_byte (abfd, mac_ptr); |
| ++mac_ptr; |
| opcode_definitions[opcode] = mac_ptr; |
| arg = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| mac_ptr += arg; |
| } |
| } |
| } |
| |
| return mac_ptr; |
| } |
| |
| /* A helper for dwarf_decode_macros that handles the GNU extensions, |
| including DW_MACRO_GNU_transparent_include. */ |
| |
| static void |
| dwarf_decode_macro_bytes (bfd *abfd, |
| const gdb_byte *mac_ptr, const gdb_byte *mac_end, |
| struct macro_source_file *current_file, |
| struct line_header *lh, |
| struct dwarf2_section_info *section, |
| int section_is_gnu, int section_is_dwz, |
| unsigned int offset_size, |
| htab_t include_hash) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| enum dwarf_macro_record_type macinfo_type; |
| int at_commandline; |
| const gdb_byte *opcode_definitions[256]; |
| |
| mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, |
| &offset_size, section_is_gnu); |
| if (mac_ptr == NULL) |
| { |
| /* We already issued a complaint. */ |
| return; |
| } |
| |
| /* Determines if GDB is still before first DW_MACINFO_start_file. If true |
| GDB is still reading the definitions from command line. First |
| DW_MACINFO_start_file will need to be ignored as it was already executed |
| to create CURRENT_FILE for the main source holding also the command line |
| definitions. On first met DW_MACINFO_start_file this flag is reset to |
| normally execute all the remaining DW_MACINFO_start_file macinfos. */ |
| |
| at_commandline = 1; |
| |
| do |
| { |
| /* Do we at least have room for a macinfo type byte? */ |
| if (mac_ptr >= mac_end) |
| { |
| dwarf2_section_buffer_overflow_complaint (section); |
| break; |
| } |
| |
| macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr); |
| mac_ptr++; |
| |
| /* Note that we rely on the fact that the corresponding GNU and |
| DWARF constants are the same. */ |
| switch (macinfo_type) |
| { |
| /* A zero macinfo type indicates the end of the macro |
| information. */ |
| case 0: |
| break; |
| |
| case DW_MACRO_GNU_define: |
| case DW_MACRO_GNU_undef: |
| case DW_MACRO_GNU_define_indirect: |
| case DW_MACRO_GNU_undef_indirect: |
| case DW_MACRO_GNU_define_indirect_alt: |
| case DW_MACRO_GNU_undef_indirect_alt: |
| { |
| unsigned int bytes_read; |
| int line; |
| const char *body; |
| int is_define; |
| |
| line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| |
| if (macinfo_type == DW_MACRO_GNU_define |
| || macinfo_type == DW_MACRO_GNU_undef) |
| { |
| body = read_direct_string (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| } |
| else |
| { |
| LONGEST str_offset; |
| |
| str_offset = read_offset_1 (abfd, mac_ptr, offset_size); |
| mac_ptr += offset_size; |
| |
| if (macinfo_type == DW_MACRO_GNU_define_indirect_alt |
| || macinfo_type == DW_MACRO_GNU_undef_indirect_alt |
| || section_is_dwz) |
| { |
| struct dwz_file *dwz = dwarf2_get_dwz_file (); |
| |
| body = read_indirect_string_from_dwz (dwz, str_offset); |
| } |
| else |
| body = read_indirect_string_at_offset (abfd, str_offset); |
| } |
| |
| is_define = (macinfo_type == DW_MACRO_GNU_define |
| || macinfo_type == DW_MACRO_GNU_define_indirect |
| || macinfo_type == DW_MACRO_GNU_define_indirect_alt); |
| if (! current_file) |
| { |
| /* DWARF violation as no main source is present. */ |
| complaint (&symfile_complaints, |
| _("debug info with no main source gives macro %s " |
| "on line %d: %s"), |
| is_define ? _("definition") : _("undefinition"), |
| line, body); |
| break; |
| } |
| if ((line == 0 && !at_commandline) |
| || (line != 0 && at_commandline)) |
| complaint (&symfile_complaints, |
| _("debug info gives %s macro %s with %s line %d: %s"), |
| at_commandline ? _("command-line") : _("in-file"), |
| is_define ? _("definition") : _("undefinition"), |
| line == 0 ? _("zero") : _("non-zero"), line, body); |
| |
| if (is_define) |
| parse_macro_definition (current_file, line, body); |
| else |
| { |
| gdb_assert (macinfo_type == DW_MACRO_GNU_undef |
| || macinfo_type == DW_MACRO_GNU_undef_indirect |
| || macinfo_type == DW_MACRO_GNU_undef_indirect_alt); |
| macro_undef (current_file, line, body); |
| } |
| } |
| break; |
| |
| case DW_MACRO_GNU_start_file: |
| { |
| unsigned int bytes_read; |
| int line, file; |
| |
| line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| |
| if ((line == 0 && !at_commandline) |
| || (line != 0 && at_commandline)) |
| complaint (&symfile_complaints, |
| _("debug info gives source %d included " |
| "from %s at %s line %d"), |
| file, at_commandline ? _("command-line") : _("file"), |
| line == 0 ? _("zero") : _("non-zero"), line); |
| |
| if (at_commandline) |
| { |
| /* This DW_MACRO_GNU_start_file was executed in the |
| pass one. */ |
| at_commandline = 0; |
| } |
| else |
| current_file = macro_start_file (file, line, current_file, lh); |
| } |
| break; |
| |
| case DW_MACRO_GNU_end_file: |
| if (! current_file) |
| complaint (&symfile_complaints, |
| _("macro debug info has an unmatched " |
| "`close_file' directive")); |
| else |
| { |
| current_file = current_file->included_by; |
| if (! current_file) |
| { |
| enum dwarf_macro_record_type next_type; |
| |
| /* GCC circa March 2002 doesn't produce the zero |
| type byte marking the end of the compilation |
| unit. Complain if it's not there, but exit no |
| matter what. */ |
| |
| /* Do we at least have room for a macinfo type byte? */ |
| if (mac_ptr >= mac_end) |
| { |
| dwarf2_section_buffer_overflow_complaint (section); |
| return; |
| } |
| |
| /* We don't increment mac_ptr here, so this is just |
| a look-ahead. */ |
| next_type |
| = (enum dwarf_macro_record_type) read_1_byte (abfd, |
| mac_ptr); |
| if (next_type != 0) |
| complaint (&symfile_complaints, |
| _("no terminating 0-type entry for " |
| "macros in `.debug_macinfo' section")); |
| |
| return; |
| } |
| } |
| break; |
| |
| case DW_MACRO_GNU_transparent_include: |
| case DW_MACRO_GNU_transparent_include_alt: |
| { |
| LONGEST offset; |
| void **slot; |
| bfd *include_bfd = abfd; |
| struct dwarf2_section_info *include_section = section; |
| const gdb_byte *include_mac_end = mac_end; |
| int is_dwz = section_is_dwz; |
| const gdb_byte *new_mac_ptr; |
| |
| offset = read_offset_1 (abfd, mac_ptr, offset_size); |
| mac_ptr += offset_size; |
| |
| if (macinfo_type == DW_MACRO_GNU_transparent_include_alt) |
| { |
| struct dwz_file *dwz = dwarf2_get_dwz_file (); |
| |
| dwarf2_read_section (objfile, &dwz->macro); |
| |
| include_section = &dwz->macro; |
| include_bfd = get_section_bfd_owner (include_section); |
| include_mac_end = dwz->macro.buffer + dwz->macro.size; |
| is_dwz = 1; |
| } |
| |
| new_mac_ptr = include_section->buffer + offset; |
| slot = htab_find_slot (include_hash, new_mac_ptr, INSERT); |
| |
| if (*slot != NULL) |
| { |
| /* This has actually happened; see |
| http://sourceware.org/bugzilla/show_bug.cgi?id=13568. */ |
| complaint (&symfile_complaints, |
| _("recursive DW_MACRO_GNU_transparent_include in " |
| ".debug_macro section")); |
| } |
| else |
| { |
| *slot = (void *) new_mac_ptr; |
| |
| dwarf_decode_macro_bytes (include_bfd, new_mac_ptr, |
| include_mac_end, current_file, lh, |
| section, section_is_gnu, is_dwz, |
| offset_size, include_hash); |
| |
| htab_remove_elt (include_hash, (void *) new_mac_ptr); |
| } |
| } |
| break; |
| |
| case DW_MACINFO_vendor_ext: |
| if (!section_is_gnu) |
| { |
| unsigned int bytes_read; |
| |
| /* This reads the constant, but since we don't recognize |
| any vendor extensions, we ignore it. */ |
| read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| read_direct_string (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| |
| /* We don't recognize any vendor extensions. */ |
| break; |
| } |
| /* FALLTHROUGH */ |
| |
| default: |
| mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, |
| mac_ptr, mac_end, abfd, offset_size, |
| section); |
| if (mac_ptr == NULL) |
| return; |
| break; |
| } |
| } while (macinfo_type != 0); |
| } |
| |
| static void |
| dwarf_decode_macros (struct dwarf2_cu *cu, unsigned int offset, |
| int section_is_gnu) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct line_header *lh = cu->line_header; |
| bfd *abfd; |
| const gdb_byte *mac_ptr, *mac_end; |
| struct macro_source_file *current_file = 0; |
| enum dwarf_macro_record_type macinfo_type; |
| unsigned int offset_size = cu->header.offset_size; |
| const gdb_byte *opcode_definitions[256]; |
| struct cleanup *cleanup; |
| htab_t include_hash; |
| void **slot; |
| struct dwarf2_section_info *section; |
| const char *section_name; |
| |
| if (cu->dwo_unit != NULL) |
| { |
| if (section_is_gnu) |
| { |
| section = &cu->dwo_unit->dwo_file->sections.macro; |
| section_name = ".debug_macro.dwo"; |
| } |
| else |
| { |
| section = &cu->dwo_unit->dwo_file->sections.macinfo; |
| section_name = ".debug_macinfo.dwo"; |
| } |
| } |
| else |
| { |
| if (section_is_gnu) |
| { |
| section = &dwarf2_per_objfile->macro; |
| section_name = ".debug_macro"; |
| } |
| else |
| { |
| section = &dwarf2_per_objfile->macinfo; |
| section_name = ".debug_macinfo"; |
| } |
| } |
| |
| dwarf2_read_section (objfile, section); |
| if (section->buffer == NULL) |
| { |
| complaint (&symfile_complaints, _("missing %s section"), section_name); |
| return; |
| } |
| abfd = get_section_bfd_owner (section); |
| |
| /* First pass: Find the name of the base filename. |
| This filename is needed in order to process all macros whose definition |
| (or undefinition) comes from the command line. These macros are defined |
| before the first DW_MACINFO_start_file entry, and yet still need to be |
| associated to the base file. |
| |
| To determine the base file name, we scan the macro definitions until we |
| reach the first DW_MACINFO_start_file entry. We then initialize |
| CURRENT_FILE accordingly so that any macro definition found before the |
| first DW_MACINFO_start_file can still be associated to the base file. */ |
| |
| mac_ptr = section->buffer + offset; |
| mac_end = section->buffer + section->size; |
| |
| mac_ptr = dwarf_parse_macro_header (opcode_definitions, abfd, mac_ptr, |
| &offset_size, section_is_gnu); |
| if (mac_ptr == NULL) |
| { |
| /* We already issued a complaint. */ |
| return; |
| } |
| |
| do |
| { |
| /* Do we at least have room for a macinfo type byte? */ |
| if (mac_ptr >= mac_end) |
| { |
| /* Complaint is printed during the second pass as GDB will probably |
| stop the first pass earlier upon finding |
| DW_MACINFO_start_file. */ |
| break; |
| } |
| |
| macinfo_type = (enum dwarf_macro_record_type) read_1_byte (abfd, mac_ptr); |
| mac_ptr++; |
| |
| /* Note that we rely on the fact that the corresponding GNU and |
| DWARF constants are the same. */ |
| switch (macinfo_type) |
| { |
| /* A zero macinfo type indicates the end of the macro |
| information. */ |
| case 0: |
| break; |
| |
| case DW_MACRO_GNU_define: |
| case DW_MACRO_GNU_undef: |
| /* Only skip the data by MAC_PTR. */ |
| { |
| unsigned int bytes_read; |
| |
| read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| read_direct_string (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| } |
| break; |
| |
| case DW_MACRO_GNU_start_file: |
| { |
| unsigned int bytes_read; |
| int line, file; |
| |
| line = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| file = read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| |
| current_file = macro_start_file (file, line, current_file, lh); |
| } |
| break; |
| |
| case DW_MACRO_GNU_end_file: |
| /* No data to skip by MAC_PTR. */ |
| break; |
| |
| case DW_MACRO_GNU_define_indirect: |
| case DW_MACRO_GNU_undef_indirect: |
| case DW_MACRO_GNU_define_indirect_alt: |
| case DW_MACRO_GNU_undef_indirect_alt: |
| { |
| unsigned int bytes_read; |
| |
| read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| mac_ptr += offset_size; |
| } |
| break; |
| |
| case DW_MACRO_GNU_transparent_include: |
| case DW_MACRO_GNU_transparent_include_alt: |
| /* Note that, according to the spec, a transparent include |
| chain cannot call DW_MACRO_GNU_start_file. So, we can just |
| skip this opcode. */ |
| mac_ptr += offset_size; |
| break; |
| |
| case DW_MACINFO_vendor_ext: |
| /* Only skip the data by MAC_PTR. */ |
| if (!section_is_gnu) |
| { |
| unsigned int bytes_read; |
| |
| read_unsigned_leb128 (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| read_direct_string (abfd, mac_ptr, &bytes_read); |
| mac_ptr += bytes_read; |
| } |
| /* FALLTHROUGH */ |
| |
| default: |
| mac_ptr = skip_unknown_opcode (macinfo_type, opcode_definitions, |
| mac_ptr, mac_end, abfd, offset_size, |
| section); |
| if (mac_ptr == NULL) |
| return; |
| break; |
| } |
| } while (macinfo_type != 0 && current_file == NULL); |
| |
| /* Second pass: Process all entries. |
| |
| Use the AT_COMMAND_LINE flag to determine whether we are still processing |
| command-line macro definitions/undefinitions. This flag is unset when we |
| reach the first DW_MACINFO_start_file entry. */ |
| |
| include_hash = htab_create_alloc (1, htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| cleanup = make_cleanup_htab_delete (include_hash); |
| mac_ptr = section->buffer + offset; |
| slot = htab_find_slot (include_hash, mac_ptr, INSERT); |
| *slot = (void *) mac_ptr; |
| dwarf_decode_macro_bytes (abfd, mac_ptr, mac_end, |
| current_file, lh, section, |
| section_is_gnu, 0, offset_size, include_hash); |
| do_cleanups (cleanup); |
| } |
| |
| /* Check if the attribute's form is a DW_FORM_block* |
| if so return true else false. */ |
| |
| static int |
| attr_form_is_block (const struct attribute *attr) |
| { |
| return (attr == NULL ? 0 : |
| attr->form == DW_FORM_block1 |
| || attr->form == DW_FORM_block2 |
| || attr->form == DW_FORM_block4 |
| || attr->form == DW_FORM_block |
| || attr->form == DW_FORM_exprloc); |
| } |
| |
| /* Return non-zero if ATTR's value is a section offset --- classes |
| lineptr, loclistptr, macptr or rangelistptr --- or zero, otherwise. |
| You may use DW_UNSND (attr) to retrieve such offsets. |
| |
| Section 7.5.4, "Attribute Encodings", explains that no attribute |
| may have a value that belongs to more than one of these classes; it |
| would be ambiguous if we did, because we use the same forms for all |
| of them. */ |
| |
| static int |
| attr_form_is_section_offset (const struct attribute *attr) |
| { |
| return (attr->form == DW_FORM_data4 |
| || attr->form == DW_FORM_data8 |
| || attr->form == DW_FORM_sec_offset); |
| } |
| |
| /* Return non-zero if ATTR's value falls in the 'constant' class, or |
| zero otherwise. When this function returns true, you can apply |
| dwarf2_get_attr_constant_value to it. |
| |
| However, note that for some attributes you must check |
| attr_form_is_section_offset before using this test. DW_FORM_data4 |
| and DW_FORM_data8 are members of both the constant class, and of |
| the classes that contain offsets into other debug sections |
| (lineptr, loclistptr, macptr or rangelistptr). The DWARF spec says |
| that, if an attribute's can be either a constant or one of the |
| section offset classes, DW_FORM_data4 and DW_FORM_data8 should be |
| taken as section offsets, not constants. */ |
| |
| static int |
| attr_form_is_constant (const struct attribute *attr) |
| { |
| switch (attr->form) |
| { |
| case DW_FORM_sdata: |
| case DW_FORM_udata: |
| case DW_FORM_data1: |
| case DW_FORM_data2: |
| case DW_FORM_data4: |
| case DW_FORM_data8: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| |
| /* DW_ADDR is always stored already as sect_offset; despite for the forms |
| besides DW_FORM_ref_addr it is stored as cu_offset in the DWARF file. */ |
| |
| static int |
| attr_form_is_ref (const struct attribute *attr) |
| { |
| switch (attr->form) |
| { |
| case DW_FORM_ref_addr: |
| case DW_FORM_ref1: |
| case DW_FORM_ref2: |
| case DW_FORM_ref4: |
| case DW_FORM_ref8: |
| case DW_FORM_ref_udata: |
| case DW_FORM_GNU_ref_alt: |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| /* Return the .debug_loc section to use for CU. |
| For DWO files use .debug_loc.dwo. */ |
| |
| static struct dwarf2_section_info * |
| cu_debug_loc_section (struct dwarf2_cu *cu) |
| { |
| if (cu->dwo_unit) |
| return &cu->dwo_unit->dwo_file->sections.loc; |
| return &dwarf2_per_objfile->loc; |
| } |
| |
| /* A helper function that fills in a dwarf2_loclist_baton. */ |
| |
| static void |
| fill_in_loclist_baton (struct dwarf2_cu *cu, |
| struct dwarf2_loclist_baton *baton, |
| const struct attribute *attr) |
| { |
| struct dwarf2_section_info *section = cu_debug_loc_section (cu); |
| |
| dwarf2_read_section (dwarf2_per_objfile->objfile, section); |
| |
| baton->per_cu = cu->per_cu; |
| gdb_assert (baton->per_cu); |
| /* We don't know how long the location list is, but make sure we |
| don't run off the edge of the section. */ |
| baton->size = section->size - DW_UNSND (attr); |
| baton->data = section->buffer + DW_UNSND (attr); |
| baton->base_address = cu->base_address; |
| baton->from_dwo = cu->dwo_unit != NULL; |
| } |
| |
| static void |
| dwarf2_symbol_mark_computed (const struct attribute *attr, struct symbol *sym, |
| struct dwarf2_cu *cu, int is_block) |
| { |
| struct objfile *objfile = dwarf2_per_objfile->objfile; |
| struct dwarf2_section_info *section = cu_debug_loc_section (cu); |
| |
| if (attr_form_is_section_offset (attr) |
| /* .debug_loc{,.dwo} may not exist at all, or the offset may be outside |
| the section. If so, fall through to the complaint in the |
| other branch. */ |
| && DW_UNSND (attr) < dwarf2_section_size (objfile, section)) |
| { |
| struct dwarf2_loclist_baton *baton; |
| |
| baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_loclist_baton); |
| |
| fill_in_loclist_baton (cu, baton, attr); |
| |
| if (cu->base_known == 0) |
| complaint (&symfile_complaints, |
| _("Location list used without " |
| "specifying the CU base address.")); |
| |
| SYMBOL_ACLASS_INDEX (sym) = (is_block |
| ? dwarf2_loclist_block_index |
| : dwarf2_loclist_index); |
| SYMBOL_LOCATION_BATON (sym) = baton; |
| } |
| else |
| { |
| struct dwarf2_locexpr_baton *baton; |
| |
| baton = XOBNEW (&objfile->objfile_obstack, struct dwarf2_locexpr_baton); |
| baton->per_cu = cu->per_cu; |
| gdb_assert (baton->per_cu); |
| |
| if (attr_form_is_block (attr)) |
| { |
| /* Note that we're just copying the block's data pointer |
| here, not the actual data. We're still pointing into the |
| info_buffer for SYM's objfile; right now we never release |
| that buffer, but when we do clean up properly this may |
| need to change. */ |
| baton->size = DW_BLOCK (attr)->size; |
| baton->data = DW_BLOCK (attr)->data; |
| } |
| else |
| { |
| dwarf2_invalid_attrib_class_complaint ("location description", |
| SYMBOL_NATURAL_NAME (sym)); |
| baton->size = 0; |
| } |
| |
| SYMBOL_ACLASS_INDEX (sym) = (is_block |
| ? dwarf2_locexpr_block_index |
| : dwarf2_locexpr_index); |
| SYMBOL_LOCATION_BATON (sym) = baton; |
| } |
| } |
| |
| /* Return the OBJFILE associated with the compilation unit CU. If CU |
| came from a separate debuginfo file, then the master objfile is |
| returned. */ |
| |
| struct objfile * |
| dwarf2_per_cu_objfile (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct objfile *objfile = per_cu->objfile; |
| |
| /* Return the master objfile, so that we can report and look up the |
| correct file containing this variable. */ |
| if (objfile->separate_debug_objfile_backlink) |
| objfile = objfile->separate_debug_objfile_backlink; |
| |
| return objfile; |
| } |
| |
| /* Return comp_unit_head for PER_CU, either already available in PER_CU->CU |
| (CU_HEADERP is unused in such case) or prepare a temporary copy at |
| CU_HEADERP first. */ |
| |
| static const struct comp_unit_head * |
| per_cu_header_read_in (struct comp_unit_head *cu_headerp, |
| struct dwarf2_per_cu_data *per_cu) |
| { |
| const gdb_byte *info_ptr; |
| |
| if (per_cu->cu) |
| return &per_cu->cu->header; |
| |
| info_ptr = per_cu->section->buffer + per_cu->offset.sect_off; |
| |
| memset (cu_headerp, 0, sizeof (*cu_headerp)); |
| read_comp_unit_head (cu_headerp, info_ptr, per_cu->objfile->obfd); |
| |
| return cu_headerp; |
| } |
| |
| /* Return the address size given in the compilation unit header for CU. */ |
| |
| int |
| dwarf2_per_cu_addr_size (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct comp_unit_head cu_header_local; |
| const struct comp_unit_head *cu_headerp; |
| |
| cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); |
| |
| return cu_headerp->addr_size; |
| } |
| |
| /* Return the offset size given in the compilation unit header for CU. */ |
| |
| int |
| dwarf2_per_cu_offset_size (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct comp_unit_head cu_header_local; |
| const struct comp_unit_head *cu_headerp; |
| |
| cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); |
| |
| return cu_headerp->offset_size; |
| } |
| |
| /* See its dwarf2loc.h declaration. */ |
| |
| int |
| dwarf2_per_cu_ref_addr_size (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct comp_unit_head cu_header_local; |
| const struct comp_unit_head *cu_headerp; |
| |
| cu_headerp = per_cu_header_read_in (&cu_header_local, per_cu); |
| |
| if (cu_headerp->version == 2) |
| return cu_headerp->addr_size; |
| else |
| return cu_headerp->offset_size; |
| } |
| |
| /* Return the text offset of the CU. The returned offset comes from |
| this CU's objfile. If this objfile came from a separate debuginfo |
| file, then the offset may be different from the corresponding |
| offset in the parent objfile. */ |
| |
| CORE_ADDR |
| dwarf2_per_cu_text_offset (struct dwarf2_per_cu_data *per_cu) |
| { |
| struct objfile *objfile = per_cu->objfile; |
| |
| return ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| } |
| |
| /* Locate the .debug_info compilation unit from CU's objfile which contains |
| the DIE at OFFSET. Raises an error on failure. */ |
| |
| static struct dwarf2_per_cu_data * |
| dwarf2_find_containing_comp_unit (sect_offset offset, |
| unsigned int offset_in_dwz, |
| struct objfile *objfile) |
| { |
| struct dwarf2_per_cu_data *this_cu; |
| int low, high; |
| const sect_offset *cu_off; |
| |
| low = 0; |
| high = dwarf2_per_objfile->n_comp_units - 1; |
| while (high > low) |
| { |
| struct dwarf2_per_cu_data *mid_cu; |
| int mid = low + (high - low) / 2; |
| |
| mid_cu = dwarf2_per_objfile->all_comp_units[mid]; |
| cu_off = &mid_cu->offset; |
| if (mid_cu->is_dwz > offset_in_dwz |
| || (mid_cu->is_dwz == offset_in_dwz |
| && cu_off->sect_off >= offset.sect_off)) |
| high = mid; |
| else |
| low = mid + 1; |
| } |
| gdb_assert (low == high); |
| this_cu = dwarf2_per_objfile->all_comp_units[low]; |
| cu_off = &this_cu->offset; |
| if (this_cu->is_dwz != offset_in_dwz || cu_off->sect_off > offset.sect_off) |
| { |
| if (low == 0 || this_cu->is_dwz != offset_in_dwz) |
| error (_("Dwarf Error: could not find partial DIE containing " |
| "offset 0x%lx [in module %s]"), |
| (long) offset.sect_off, bfd_get_filename (objfile->obfd)); |
| |
| gdb_assert (dwarf2_per_objfile->all_comp_units[low-1]->offset.sect_off |
| <= offset.sect_off); |
| return dwarf2_per_objfile->all_comp_units[low-1]; |
| } |
| else |
| { |
| this_cu = dwarf2_per_objfile->all_comp_units[low]; |
| if (low == dwarf2_per_objfile->n_comp_units - 1 |
| && offset.sect_off >= this_cu->offset.sect_off + this_cu->length) |
| error (_("invalid dwarf2 offset %u"), offset.sect_off); |
| gdb_assert (offset.sect_off < this_cu->offset.sect_off + this_cu->length); |
| return this_cu; |
| } |
| } |
| |
| /* Initialize dwarf2_cu CU, owned by PER_CU. */ |
| |
| static void |
| init_one_comp_unit (struct dwarf2_cu *cu, struct dwarf2_per_cu_data *per_cu) |
| { |
| memset (cu, 0, sizeof (*cu)); |
| per_cu->cu = cu; |
| cu->per_cu = per_cu; |
| cu->objfile = per_cu->objfile; |
| obstack_init (&cu->comp_unit_obstack); |
| } |
| |
| /* Initialize basic fields of dwarf_cu CU according to DIE COMP_UNIT_DIE. */ |
| |
| static void |
| prepare_one_comp_unit (struct dwarf2_cu *cu, struct die_info *comp_unit_die, |
| enum language pretend_language) |
| { |
| struct attribute *attr; |
| |
| /* Set the language we're debugging. */ |
| attr = dwarf2_attr (comp_unit_die, DW_AT_language, cu); |
| if (attr) |
| set_cu_language (DW_UNSND (attr), cu); |
| else |
| { |
| cu->language = pretend_language; |
| cu->language_defn = language_def (cu->language); |
| } |
| |
| cu->producer = dwarf2_string_attr (comp_unit_die, DW_AT_producer, cu); |
| } |
| |
| /* Release one cached compilation unit, CU. We unlink it from the tree |
| of compilation units, but we don't remove it from the read_in_chain; |
| the caller is responsible for that. |
| NOTE: DATA is a void * because this function is also used as a |
| cleanup routine. */ |
| |
| static void |
| free_heap_comp_unit (void *data) |
| { |
| struct dwarf2_cu *cu = (struct dwarf2_cu *) data; |
| |
| gdb_assert (cu->per_cu != NULL); |
| cu->per_cu->cu = NULL; |
| cu->per_cu = NULL; |
| |
| obstack_free (&cu->comp_unit_obstack, NULL); |
| |
| xfree (cu); |
| } |
| |
| /* This cleanup function is passed the address of a dwarf2_cu on the stack |
| when we're finished with it. We can't free the pointer itself, but be |
| sure to unlink it from the cache. Also release any associated storage. */ |
| |
| static void |
| free_stack_comp_unit (void *data) |
| { |
| struct dwarf2_cu *cu = (struct dwarf2_cu *) data; |
| |
| gdb_assert (cu->per_cu != NULL); |
| cu->per_cu->cu = NULL; |
| cu->per_cu = NULL; |
| |
| obstack_free (&cu->comp_unit_obstack, NULL); |
| cu->partial_dies = NULL; |
| } |
| |
| /* Free all cached compilation units. */ |
| |
| static void |
| free_cached_comp_units (void *data) |
| { |
| struct dwarf2_per_cu_data *per_cu, **last_chain; |
| |
| per_cu = dwarf2_per_objfile->read_in_chain; |
| last_chain = &dwarf2_per_objfile->read_in_chain; |
| while (per_cu != NULL) |
| { |
| struct dwarf2_per_cu_data *next_cu; |
| |
| next_cu = per_cu->cu->read_in_chain; |
| |
| free_heap_comp_unit (per_cu->cu); |
| *last_chain = next_cu; |
| |
| per_cu = next_cu; |
| } |
| } |
| |
| /* Increase the age counter on each cached compilation unit, and free |
| any that are too old. */ |
| |
| static void |
| age_cached_comp_units (void) |
| { |
| struct dwarf2_per_cu_data *per_cu, **last_chain; |
| |
| dwarf2_clear_marks (dwarf2_per_objfile->read_in_chain); |
| per_cu = dwarf2_per_objfile->read_in_chain; |
| while (per_cu != NULL) |
| { |
| per_cu->cu->last_used ++; |
| if (per_cu->cu->last_used <= dwarf_max_cache_age) |
| dwarf2_mark (per_cu->cu); |
| per_cu = per_cu->cu->read_in_chain; |
| } |
| |
| per_cu = dwarf2_per_objfile->read_in_chain; |
| last_chain = &dwarf2_per_objfile->read_in_chain; |
| while (per_cu != NULL) |
| { |
| struct dwarf2_per_cu_data *next_cu; |
| |
| next_cu = per_cu->cu->read_in_chain; |
| |
| if (!per_cu->cu->mark) |
| { |
| free_heap_comp_unit (per_cu->cu); |
| *last_chain = next_cu; |
| } |
| else |
| last_chain = &per_cu->cu->read_in_chain; |
| |
| per_cu = next_cu; |
| } |
| } |
| |
| /* Remove a single compilation unit from the cache. */ |
| |
| static void |
| free_one_cached_comp_unit (struct dwarf2_per_cu_data *target_per_cu) |
| { |
| struct dwarf2_per_cu_data *per_cu, **last_chain; |
| |
| per_cu = dwarf2_per_objfile->read_in_chain; |
| last_chain = &dwarf2_per_objfile->read_in_chain; |
| while (per_cu != NULL) |
| { |
| struct dwarf2_per_cu_data *next_cu; |
| |
| next_cu = per_cu->cu->read_in_chain; |
| |
| if (per_cu == target_per_cu) |
| { |
| free_heap_comp_unit (per_cu->cu); |
| per_cu->cu = NULL; |
| *last_chain = next_cu; |
| break; |
| } |
| else |
| last_chain = &per_cu->cu->read_in_chain; |
| |
| per_cu = next_cu; |
| } |
| } |
| |
| /* Release all extra memory associated with OBJFILE. */ |
| |
| void |
| dwarf2_free_objfile (struct objfile *objfile) |
| { |
| dwarf2_per_objfile |
| = (struct dwarf2_per_objfile *) objfile_data (objfile, |
| dwarf2_objfile_data_key); |
| |
| if (dwarf2_per_objfile == NULL) |
| return; |
| |
| /* Cached DIE trees use xmalloc and the comp_unit_obstack. */ |
| free_cached_comp_units (NULL); |
| |
| if (dwarf2_per_objfile->quick_file_names_table) |
| htab_delete (dwarf2_per_objfile->quick_file_names_table); |
| |
| if (dwarf2_per_objfile->line_header_hash) |
| htab_delete (dwarf2_per_objfile->line_header_hash); |
| |
| /* Everything else should be on the objfile obstack. */ |
| } |
| |
| /* A set of CU "per_cu" pointer, DIE offset, and GDB type pointer. |
| We store these in a hash table separate from the DIEs, and preserve them |
| when the DIEs are flushed out of cache. |
| |
| The CU "per_cu" pointer is needed because offset alone is not enough to |
| uniquely identify the type. A file may have multiple .debug_types sections, |
| or the type may come from a DWO file. Furthermore, while it's more logical |
| to use per_cu->section+offset, with Fission the section with the data is in |
| the DWO file but we don't know that section at the point we need it. |
| We have to use something in dwarf2_per_cu_data (or the pointer to it) |
| because we can enter the lookup routine, get_die_type_at_offset, from |
| outside this file, and thus won't necessarily have PER_CU->cu. |
| Fortunately, PER_CU is stable for the life of the objfile. */ |
| |
| struct dwarf2_per_cu_offset_and_type |
| { |
| const struct dwarf2_per_cu_data *per_cu; |
| sect_offset offset; |
| struct type *type; |
| }; |
| |
| /* Hash function for a dwarf2_per_cu_offset_and_type. */ |
| |
| static hashval_t |
| per_cu_offset_and_type_hash (const void *item) |
| { |
| const struct dwarf2_per_cu_offset_and_type *ofs |
| = (const struct dwarf2_per_cu_offset_and_type *) item; |
| |
| return (uintptr_t) ofs->per_cu + ofs->offset.sect_off; |
| } |
| |
| /* Equality function for a dwarf2_per_cu_offset_and_type. */ |
| |
| static int |
| per_cu_offset_and_type_eq (const void *item_lhs, const void *item_rhs) |
| { |
| const struct dwarf2_per_cu_offset_and_type *ofs_lhs |
| = (const struct dwarf2_per_cu_offset_and_type *) item_lhs; |
| const struct dwarf2_per_cu_offset_and_type *ofs_rhs |
| = (const struct dwarf2_per_cu_offset_and_type *) item_rhs; |
| |
| return (ofs_lhs->per_cu == ofs_rhs->per_cu |
| && ofs_lhs->offset.sect_off == ofs_rhs->offset.sect_off); |
| } |
| |
| /* Set the type associated with DIE to TYPE. Save it in CU's hash |
| table if necessary. For convenience, return TYPE. |
| |
| The DIEs reading must have careful ordering to: |
| * Not cause infite loops trying to read in DIEs as a prerequisite for |
| reading current DIE. |
| * Not trying to dereference contents of still incompletely read in types |
| while reading in other DIEs. |
| * Enable referencing still incompletely read in types just by a pointer to |
| the type without accessing its fields. |
| |
| Therefore caller should follow these rules: |
| * Try to fetch any prerequisite types we may need to build this DIE type |
| before building the type and calling set_die_type. |
| * After building type call set_die_type for current DIE as soon as |
| possible before fetching more types to complete the current type. |
| * Make the type as complete as possible before fetching more types. */ |
| |
| static struct type * |
| set_die_type (struct die_info *die, struct type *type, struct dwarf2_cu *cu) |
| { |
| struct dwarf2_per_cu_offset_and_type **slot, ofs; |
| struct objfile *objfile = cu->objfile; |
| struct attribute *attr; |
| struct dynamic_prop prop; |
| |
| /* For Ada types, make sure that the gnat-specific data is always |
| initialized (if not already set). There are a few types where |
| we should not be doing so, because the type-specific area is |
| already used to hold some other piece of info (eg: TYPE_CODE_FLT |
| where the type-specific area is used to store the floatformat). |
| But this is not a problem, because the gnat-specific information |
| is actually not needed for these types. */ |
| if (need_gnat_info (cu) |
| && TYPE_CODE (type) != TYPE_CODE_FUNC |
| && TYPE_CODE (type) != TYPE_CODE_FLT |
| && TYPE_CODE (type) != TYPE_CODE_METHODPTR |
| && TYPE_CODE (type) != TYPE_CODE_MEMBERPTR |
| && TYPE_CODE (type) != TYPE_CODE_METHOD |
| && !HAVE_GNAT_AUX_INFO (type)) |
| INIT_GNAT_SPECIFIC (type); |
| |
| /* Read DW_AT_allocated and set in type. */ |
| attr = dwarf2_attr (die, DW_AT_allocated, cu); |
| if (attr_form_is_block (attr)) |
| { |
| if (attr_to_dynamic_prop (attr, die, cu, &prop)) |
| add_dyn_prop (DYN_PROP_ALLOCATED, prop, type, objfile); |
| } |
| else if (attr != NULL) |
| { |
| complaint (&symfile_complaints, |
| _("DW_AT_allocated has the wrong form (%s) at DIE 0x%x"), |
| (attr != NULL ? dwarf_form_name (attr->form) : "n/a"), |
| die->offset.sect_off); |
| } |
| |
| /* Read DW_AT_associated and set in type. */ |
| attr = dwarf2_attr (die, DW_AT_associated, cu); |
| if (attr_form_is_block (attr)) |
| { |
| if (attr_to_dynamic_prop (attr, die, cu, &prop)) |
| add_dyn_prop (DYN_PROP_ASSOCIATED, prop, type, objfile); |
| } |
| else if (attr != NULL) |
| { |
| complaint (&symfile_complaints, |
| _("DW_AT_associated has the wrong form (%s) at DIE 0x%x"), |
| (attr != NULL ? dwarf_form_name (attr->form) : "n/a"), |
| die->offset.sect_off); |
| } |
| |
| /* Read DW_AT_data_location and set in type. */ |
| attr = dwarf2_attr (die, DW_AT_data_location, cu); |
| if (attr_to_dynamic_prop (attr, die, cu, &prop)) |
| add_dyn_prop (DYN_PROP_DATA_LOCATION, prop, type, objfile); |
| |
| if (dwarf2_per_objfile->die_type_hash == NULL) |
| { |
| dwarf2_per_objfile->die_type_hash = |
| htab_create_alloc_ex (127, |
| per_cu_offset_and_type_hash, |
| per_cu_offset_and_type_eq, |
| NULL, |
| &objfile->objfile_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| } |
| |
| ofs.per_cu = cu->per_cu; |
| ofs.offset = die->offset; |
| ofs.type = type; |
| slot = (struct dwarf2_per_cu_offset_and_type **) |
| htab_find_slot (dwarf2_per_objfile->die_type_hash, &ofs, INSERT); |
| if (*slot) |
| complaint (&symfile_complaints, |
| _("A problem internal to GDB: DIE 0x%x has type already set"), |
| die->offset.sect_off); |
| *slot = XOBNEW (&objfile->objfile_obstack, |
| struct dwarf2_per_cu_offset_and_type); |
| **slot = ofs; |
| return type; |
| } |
| |
| /* Look up the type for the die at OFFSET in PER_CU in die_type_hash, |
| or return NULL if the die does not have a saved type. */ |
| |
| static struct type * |
| get_die_type_at_offset (sect_offset offset, |
| struct dwarf2_per_cu_data *per_cu) |
| { |
| struct dwarf2_per_cu_offset_and_type *slot, ofs; |
| |
| if (dwarf2_per_objfile->die_type_hash == NULL) |
| return NULL; |
| |
| ofs.per_cu = per_cu; |
| ofs.offset = offset; |
| slot = ((struct dwarf2_per_cu_offset_and_type *) |
| htab_find (dwarf2_per_objfile->die_type_hash, &ofs)); |
| if (slot) |
| return slot->type; |
| else |
| return NULL; |
| } |
| |
| /* Look up the type for DIE in CU in die_type_hash, |
| or return NULL if DIE does not have a saved type. */ |
| |
| static struct type * |
| get_die_type (struct die_info *die, struct dwarf2_cu *cu) |
| { |
| return get_die_type_at_offset (die->offset, cu->per_cu); |
| } |
| |
| /* Add a dependence relationship from CU to REF_PER_CU. */ |
| |
| static void |
| dwarf2_add_dependence (struct dwarf2_cu *cu, |
| struct dwarf2_per_cu_data *ref_per_cu) |
| { |
| void **slot; |
| |
| if (cu->dependencies == NULL) |
| cu->dependencies |
| = htab_create_alloc_ex (5, htab_hash_pointer, htab_eq_pointer, |
| NULL, &cu->comp_unit_obstack, |
| hashtab_obstack_allocate, |
| dummy_obstack_deallocate); |
| |
| slot = htab_find_slot (cu->dependencies, ref_per_cu, INSERT); |
| if (*slot == NULL) |
| *slot = ref_per_cu; |
| } |
| |
| /* Subroutine of dwarf2_mark to pass to htab_traverse. |
| Set the mark field in every compilation unit in the |
| cache that we must keep because we are keeping CU. */ |
| |
| static int |
| dwarf2_mark_helper (void **slot, void *data) |
| { |
| struct dwarf2_per_cu_data *per_cu; |
| |
| per_cu = (struct dwarf2_per_cu_data *) *slot; |
| |
| /* cu->dependencies references may not yet have been ever read if QUIT aborts |
| reading of the chain. As such dependencies remain valid it is not much |
| useful to track and undo them during QUIT cleanups. */ |
| if (per_cu->cu == NULL) |
| return 1; |
| |
| if (per_cu->cu->mark) |
| return 1; |
| per_cu->cu->mark = 1; |
| |
| if (per_cu->cu->dependencies != NULL) |
| htab_traverse (per_cu->cu->dependencies, dwarf2_mark_helper, NULL); |
| |
| return 1; |
| } |
| |
| /* Set the mark field in CU and in every other compilation unit in the |
| cache that we must keep because we are keeping CU. */ |
| |
| static void |
| dwarf2_mark (struct dwarf2_cu *cu) |
| { |
| if (cu->mark) |
| return; |
| cu->mark = 1; |
| if (cu->dependencies != NULL) |
| htab_traverse (cu->dependencies, dwarf2_mark_helper, NULL); |
| } |
| |
| static void |
| dwarf2_clear_marks (struct dwarf2_per_cu_data *per_cu) |
| { |
| while (per_cu) |
| { |
| per_cu->cu->mark = 0; |
| per_cu = per_cu->cu->read_in_chain; |
| } |
| } |
| |
| /* Trivial hash function for partial_die_info: the hash value of a DIE |
| is its offset in .debug_info for this objfile. */ |
| |
| static hashval_t |
| partial_die_hash (const void *item) |
| { |
| const struct partial_die_info *part_die |
| = (const struct partial_die_info *) item; |
| |
| return part_die->offset.sect_off; |
| } |
| |
| /* Trivial comparison function for partial_die_info structures: two DIEs |
| are equal if they have the same offset. */ |
| |
| static int |
| partial_die_eq (const void *item_lhs, const void *item_rhs) |
| { |
| const struct partial_die_info *part_die_lhs |
| = (const struct partial_die_info *) item_lhs; |
| const struct partial_die_info *part_die_rhs |
| = (const struct partial_die_info *) item_rhs; |
| |
| return part_die_lhs->offset.sect_off == part_die_rhs->offset.sect_off; |
| } |
| |
| static struct cmd_list_element *set_dwarf_cmdlist; |
| static struct cmd_list_element *show_dwarf_cmdlist; |
| |
| static void |
| set_dwarf_cmd (char *args, int from_tty) |
| { |
| help_list (set_dwarf_cmdlist, "maintenance set dwarf ", all_commands, |
| gdb_stdout); |
| } |
| |
| static void |
| show_dwarf_cmd (char *args, int from_tty) |
| { |
| cmd_show_list (show_dwarf_cmdlist, from_tty, ""); |
| } |
| |
| /* Free data associated with OBJFILE, if necessary. */ |
| |
| static void |
| dwarf2_per_objfile_free (struct objfile *objfile, void *d) |
| { |
| struct dwarf2_per_objfile *data = (struct dwarf2_per_objfile *) d; |
| int ix; |
| |
| /* Make sure we don't accidentally use dwarf2_per_objfile while |
| cleaning up. */ |
| dwarf2_per_objfile = NULL; |
| |
| for (ix = 0; ix < data->n_comp_units; ++ix) |
| VEC_free (dwarf2_per_cu_ptr, data->all_comp_units[ix]->imported_symtabs); |
| |
| for (ix = 0; ix < data->n_type_units; ++ix) |
| VEC_free (dwarf2_per_cu_ptr, |
| data->all_type_units[ix]->per_cu.imported_symtabs); |
| xfree (data->all_type_units); |
| |
| VEC_free (dwarf2_section_info_def, data->types); |
| |
| if (data->dwo_files) |
| free_dwo_files (data->dwo_files, objfile); |
| if (data->dwp_file) |
| gdb_bfd_unref (data->dwp_file->dbfd); |
| |
| if (data->dwz_file && data->dwz_file->dwz_bfd) |
| gdb_bfd_unref (data->dwz_file->dwz_bfd); |
| } |
| |
| |
| /* The "save gdb-index" command. */ |
| |
| /* The contents of the hash table we create when building the string |
| table. */ |
| struct strtab_entry |
| { |
| offset_type offset; |
| const char *str; |
| }; |
| |
| /* Hash function for a strtab_entry. |
| |
| Function is used only during write_hash_table so no index format backward |
| compatibility is needed. */ |
| |
| static hashval_t |
| hash_strtab_entry (const void *e) |
| { |
| const struct strtab_entry *entry = (const struct strtab_entry *) e; |
| return mapped_index_string_hash (INT_MAX, entry->str); |
| } |
| |
| /* Equality function for a strtab_entry. */ |
| |
| static int |
| eq_strtab_entry (const void *a, const void *b) |
| { |
| const struct strtab_entry *ea = (const struct strtab_entry *) a; |
| const struct strtab_entry *eb = (const struct strtab_entry *) b; |
| return !strcmp (ea->str, eb->str); |
| } |
| |
| /* Create a strtab_entry hash table. */ |
| |
| static htab_t |
| create_strtab (void) |
| { |
| return htab_create_alloc (100, hash_strtab_entry, eq_strtab_entry, |
| xfree, xcalloc, xfree); |
| } |
| |
| /* Add a string to the constant pool. Return the string's offset in |
| host order. */ |
| |
| static offset_type |
| add_string (htab_t table, struct obstack *cpool, const char *str) |
| { |
| void **slot; |
| struct strtab_entry entry; |
| struct strtab_entry *result; |
| |
| entry.str = str; |
| slot = htab_find_slot (table, &entry, INSERT); |
| if (*slot) |
| result = (struct strtab_entry *) *slot; |
| else |
| { |
| result = XNEW (struct strtab_entry); |
| result->offset = obstack_object_size (cpool); |
| result->str = str; |
| obstack_grow_str0 (cpool, str); |
| *slot = result; |
| } |
| return result->offset; |
| } |
| |
| /* An entry in the symbol table. */ |
| struct symtab_index_entry |
| { |
| /* The name of the symbol. */ |
| const char *name; |
| /* The offset of the name in the constant pool. */ |
| offset_type index_offset; |
| /* A sorted vector of the indices of all the CUs that hold an object |
| of this name. */ |
| VEC (offset_type) *cu_indices; |
| }; |
| |
| /* The symbol table. This is a power-of-2-sized hash table. */ |
| struct mapped_symtab |
| { |
| offset_type n_elements; |
| offset_type size; |
| struct symtab_index_entry **data; |
| }; |
| |
| /* Hash function for a symtab_index_entry. */ |
| |
| static hashval_t |
| hash_symtab_entry (const void *e) |
| { |
| const struct symtab_index_entry *entry |
| = (const struct symtab_index_entry *) e; |
| return iterative_hash (VEC_address (offset_type, entry->cu_indices), |
| sizeof (offset_type) * VEC_length (offset_type, |
| entry->cu_indices), |
| 0); |
| } |
| |
| /* Equality function for a symtab_index_entry. */ |
| |
| static int |
| eq_symtab_entry (const void *a, const void *b) |
| { |
| const struct symtab_index_entry *ea = (const struct symtab_index_entry *) a; |
| const struct symtab_index_entry *eb = (const struct symtab_index_entry *) b; |
| int len = VEC_length (offset_type, ea->cu_indices); |
| if (len != VEC_length (offset_type, eb->cu_indices)) |
| return 0; |
| return !memcmp (VEC_address (offset_type, ea->cu_indices), |
| VEC_address (offset_type, eb->cu_indices), |
| sizeof (offset_type) * len); |
| } |
| |
| /* Destroy a symtab_index_entry. */ |
| |
| static void |
| delete_symtab_entry (void *p) |
| { |
| struct symtab_index_entry *entry = (struct symtab_index_entry *) p; |
| VEC_free (offset_type, entry->cu_indices); |
| xfree (entry); |
| } |
| |
| /* Create a hash table holding symtab_index_entry objects. */ |
| |
| static htab_t |
| create_symbol_hash_table (void) |
| { |
| return htab_create_alloc (100, hash_symtab_entry, eq_symtab_entry, |
| delete_symtab_entry, xcalloc, xfree); |
| } |
| |
| /* Create a new mapped symtab object. */ |
| |
| static struct mapped_symtab * |
| create_mapped_symtab (void) |
| { |
| struct mapped_symtab *symtab = XNEW (struct mapped_symtab); |
| symtab->n_elements = 0; |
| symtab->size = 1024; |
| symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size); |
| return symtab; |
| } |
| |
| /* Destroy a mapped_symtab. */ |
| |
| static void |
| cleanup_mapped_symtab (void *p) |
| { |
| struct mapped_symtab *symtab = (struct mapped_symtab *) p; |
| /* The contents of the array are freed when the other hash table is |
| destroyed. */ |
| xfree (symtab->data); |
| xfree (symtab); |
| } |
| |
| /* Find a slot in SYMTAB for the symbol NAME. Returns a pointer to |
| the slot. |
| |
| Function is used only during write_hash_table so no index format backward |
| compatibility is needed. */ |
| |
| static struct symtab_index_entry ** |
| find_slot (struct mapped_symtab *symtab, const char *name) |
| { |
| offset_type index, step, hash = mapped_index_string_hash (INT_MAX, name); |
| |
| index = hash & (symtab->size - 1); |
| step = ((hash * 17) & (symtab->size - 1)) | 1; |
| |
| for (;;) |
| { |
| if (!symtab->data[index] || !strcmp (name, symtab->data[index]->name)) |
| return &symtab->data[index]; |
| index = (index + step) & (symtab->size - 1); |
| } |
| } |
| |
| /* Expand SYMTAB's hash table. */ |
| |
| static void |
| hash_expand (struct mapped_symtab *symtab) |
| { |
| offset_type old_size = symtab->size; |
| offset_type i; |
| struct symtab_index_entry **old_entries = symtab->data; |
| |
| symtab->size *= 2; |
| symtab->data = XCNEWVEC (struct symtab_index_entry *, symtab->size); |
| |
| for (i = 0; i < old_size; ++i) |
| { |
| if (old_entries[i]) |
| { |
| struct symtab_index_entry **slot = find_slot (symtab, |
| old_entries[i]->name); |
| *slot = old_entries[i]; |
| } |
| } |
| |
| xfree (old_entries); |
| } |
| |
| /* Add an entry to SYMTAB. NAME is the name of the symbol. |
| CU_INDEX is the index of the CU in which the symbol appears. |
| IS_STATIC is one if the symbol is static, otherwise zero (global). */ |
| |
| static void |
| add_index_entry (struct mapped_symtab *symtab, const char *name, |
| int is_static, gdb_index_symbol_kind kind, |
| offset_type cu_index) |
| { |
| struct symtab_index_entry **slot; |
| offset_type cu_index_and_attrs; |
| |
| ++symtab->n_elements; |
| if (4 * symtab->n_elements / 3 >= symtab->size) |
| hash_expand (symtab); |
| |
| slot = find_slot (symtab, name); |
| if (!*slot) |
| { |
| *slot = XNEW (struct symtab_index_entry); |
| (*slot)->name = name; |
| /* index_offset is set later. */ |
| (*slot)->cu_indices = NULL; |
| } |
| |
| cu_index_and_attrs = 0; |
| DW2_GDB_INDEX_CU_SET_VALUE (cu_index_and_attrs, cu_index); |
| DW2_GDB_INDEX_SYMBOL_STATIC_SET_VALUE (cu_index_and_attrs, is_static); |
| DW2_GDB_INDEX_SYMBOL_KIND_SET_VALUE (cu_index_and_attrs, kind); |
| |
| /* We don't want to record an index value twice as we want to avoid the |
| duplication. |
| We process all global symbols and then all static symbols |
| (which would allow us to avoid the duplication by only having to check |
| the last entry pushed), but a symbol could have multiple kinds in one CU. |
| To keep things simple we don't worry about the duplication here and |
| sort and uniqufy the list after we've processed all symbols. */ |
| VEC_safe_push (offset_type, (*slot)->cu_indices, cu_index_and_attrs); |
| } |
| |
| /* qsort helper routine for uniquify_cu_indices. */ |
| |
| static int |
| offset_type_compare (const void *ap, const void *bp) |
| { |
| offset_type a = *(offset_type *) ap; |
| offset_type b = *(offset_type *) bp; |
| |
| return (a > b) - (b > a); |
| } |
| |
| /* Sort and remove duplicates of all symbols' cu_indices lists. */ |
| |
| static void |
| uniquify_cu_indices (struct mapped_symtab *symtab) |
| { |
| int i; |
| |
| for (i = 0; i < symtab->size; ++i) |
| { |
| struct symtab_index_entry *entry = symtab->data[i]; |
| |
| if (entry |
| && entry->cu_indices != NULL) |
| { |
| unsigned int next_to_insert, next_to_check; |
| offset_type last_value; |
| |
| qsort (VEC_address (offset_type, entry->cu_indices), |
| VEC_length (offset_type, entry->cu_indices), |
| sizeof (offset_type), offset_type_compare); |
| |
| last_value = VEC_index (offset_type, entry->cu_indices, 0); |
| next_to_insert = 1; |
| for (next_to_check = 1; |
| next_to_check < VEC_length (offset_type, entry->cu_indices); |
| ++next_to_check) |
| { |
| if (VEC_index (offset_type, entry->cu_indices, next_to_check) |
| != last_value) |
| { |
| last_value = VEC_index (offset_type, entry->cu_indices, |
| next_to_check); |
| VEC_replace (offset_type, entry->cu_indices, next_to_insert, |
| last_value); |
| ++next_to_insert; |
| } |
| } |
| VEC_truncate (offset_type, entry->cu_indices, next_to_insert); |
| } |
| } |
| } |
| |
| /* Add a vector of indices to the constant pool. */ |
| |
| static offset_type |
| add_indices_to_cpool (htab_t symbol_hash_table, struct obstack *cpool, |
| struct symtab_index_entry *entry) |
| { |
| void **slot; |
| |
| slot = htab_find_slot (symbol_hash_table, entry, INSERT); |
| if (!*slot) |
| { |
| offset_type len = VEC_length (offset_type, entry->cu_indices); |
| offset_type val = MAYBE_SWAP (len); |
| offset_type iter; |
| int i; |
| |
| *slot = entry; |
| entry->index_offset = obstack_object_size (cpool); |
| |
| obstack_grow (cpool, &val, sizeof (val)); |
| for (i = 0; |
| VEC_iterate (offset_type, entry->cu_indices, i, iter); |
| ++i) |
| { |
| val = MAYBE_SWAP (iter); |
| obstack_grow (cpool, &val, sizeof (val)); |
| } |
| } |
| else |
| { |
| struct symtab_index_entry *old_entry |
| = (struct symtab_index_entry *) *slot; |
| entry->index_offset = old_entry->index_offset; |
| entry = old_entry; |
| } |
| return entry->index_offset; |
| } |
| |
| /* Write the mapped hash table SYMTAB to the obstack OUTPUT, with |
| constant pool entries going into the obstack CPOOL. */ |
| |
| static void |
| write_hash_table (struct mapped_symtab *symtab, |
| struct obstack *output, struct obstack *cpool) |
| { |
| offset_type i; |
| htab_t symbol_hash_table; |
| htab_t str_table; |
| |
| symbol_hash_table = create_symbol_hash_table (); |
| str_table = create_strtab (); |
| |
| /* We add all the index vectors to the constant pool first, to |
| ensure alignment is ok. */ |
| for (i = 0; i < symtab->size; ++i) |
| { |
| if (symtab->data[i]) |
| add_indices_to_cpool (symbol_hash_table, cpool, symtab->data[i]); |
| } |
| |
| /* Now write out the hash table. */ |
| for (i = 0; i < symtab->size; ++i) |
| { |
| offset_type str_off, vec_off; |
| |
| if (symtab->data[i]) |
| { |
| str_off = add_string (str_table, cpool, symtab->data[i]->name); |
| vec_off = symtab->data[i]->index_offset; |
| } |
| else |
| { |
| /* While 0 is a valid constant pool index, it is not valid |
| to have 0 for both offsets. */ |
| str_off = 0; |
| vec_off = 0; |
| } |
| |
| str_off = MAYBE_SWAP (str_off); |
| vec_off = MAYBE_SWAP (vec_off); |
| |
| obstack_grow (output, &str_off, sizeof (str_off)); |
| obstack_grow (output, &vec_off, sizeof (vec_off)); |
| } |
| |
| htab_delete (str_table); |
| htab_delete (symbol_hash_table); |
| } |
| |
| /* Struct to map psymtab to CU index in the index file. */ |
| struct psymtab_cu_index_map |
| { |
| struct partial_symtab *psymtab; |
| unsigned int cu_index; |
| }; |
| |
| static hashval_t |
| hash_psymtab_cu_index (const void *item) |
| { |
| const struct psymtab_cu_index_map *map |
| = (const struct psymtab_cu_index_map *) item; |
| |
| return htab_hash_pointer (map->psymtab); |
| } |
| |
| static int |
| eq_psymtab_cu_index (const void *item_lhs, const void *item_rhs) |
| { |
| const struct psymtab_cu_index_map *lhs |
| = (const struct psymtab_cu_index_map *) item_lhs; |
| const struct psymtab_cu_index_map *rhs |
| = (const struct psymtab_cu_index_map *) item_rhs; |
| |
| return lhs->psymtab == rhs->psymtab; |
| } |
| |
| /* Helper struct for building the address table. */ |
| struct addrmap_index_data |
| { |
| struct objfile *objfile; |
| struct obstack *addr_obstack; |
| htab_t cu_index_htab; |
| |
| /* Non-zero if the previous_* fields are valid. |
| We can't write an entry until we see the next entry (since it is only then |
| that we know the end of the entry). */ |
| int previous_valid; |
| /* Index of the CU in the table of all CUs in the index file. */ |
| unsigned int previous_cu_index; |
| /* Start address of the CU. */ |
| CORE_ADDR previous_cu_start; |
| }; |
| |
| /* Write an address entry to OBSTACK. */ |
| |
| static void |
| add_address_entry (struct objfile *objfile, struct obstack *obstack, |
| CORE_ADDR start, CORE_ADDR end, unsigned int cu_index) |
| { |
| offset_type cu_index_to_write; |
| gdb_byte addr[8]; |
| CORE_ADDR baseaddr; |
| |
| baseaddr = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile)); |
| |
| store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, start - baseaddr); |
| obstack_grow (obstack, addr, 8); |
| store_unsigned_integer (addr, 8, BFD_ENDIAN_LITTLE, end - baseaddr); |
| obstack_grow (obstack, addr, 8); |
| cu_index_to_write = MAYBE_SWAP (cu_index); |
| obstack_grow (obstack, &cu_index_to_write, sizeof (offset_type)); |
| } |
| |
| /* Worker function for traversing an addrmap to build the address table. */ |
| |
| static int |
| add_address_entry_worker (void *datap, CORE_ADDR start_addr, void *obj) |
| { |
| struct addrmap_index_data *data = (struct addrmap_index_data *) datap; |
| struct partial_symtab *pst = (struct partial_symtab *) obj; |
| |
| if (data->previous_valid) |
| add_address_entry (data->objfile, data->addr_obstack, |
| data->previous_cu_start, start_addr, |
| data->previous_cu_index); |
| |
| data->previous_cu_start = start_addr; |
| if (pst != NULL) |
| { |
| struct psymtab_cu_index_map find_map, *map; |
| find_map.psymtab = pst; |
| map = ((struct psymtab_cu_index_map *) |
| htab_find (data->cu_index_htab, &find_map)); |
| gdb_assert (map != NULL); |
| data->previous_cu_index = map->cu_index; |
| data->previous_valid = 1; |
| } |
| else |
| data->previous_valid = 0; |
| |
| return 0; |
| } |
| |
| /* Write OBJFILE's address map to OBSTACK. |
| CU_INDEX_HTAB is used to map addrmap entries to their CU indices |
| in the index file. */ |
| |
| static void |
| write_address_map (struct objfile *objfile, struct obstack *obstack, |
| htab_t cu_index_htab) |
| { |
| struct addrmap_index_data addrmap_index_data; |
| |
| /* When writing the address table, we have to cope with the fact that |
| the addrmap iterator only provides the start of a region; we have to |
| wait until the next invocation to get the start of the next region. */ |
| |
| addrmap_index_data.objfile = objfile; |
| addrmap_index_data.addr_obstack = obstack; |
| addrmap_index_data.cu_index_htab = cu_index_htab; |
| addrmap_index_data.previous_valid = 0; |
| |
| addrmap_foreach (objfile->psymtabs_addrmap, add_address_entry_worker, |
| &addrmap_index_data); |
| |
| /* It's highly unlikely the last entry (end address = 0xff...ff) |
| is valid, but we should still handle it. |
| The end address is recorded as the start of the next region, but that |
| doesn't work here. To cope we pass 0xff...ff, this is a rare situation |
| anyway. */ |
| if (addrmap_index_data.previous_valid) |
| add_address_entry (objfile, obstack, |
| addrmap_index_data.previous_cu_start, (CORE_ADDR) -1, |
| addrmap_index_data.previous_cu_index); |
| } |
| |
| /* Return the symbol kind of PSYM. */ |
| |
| static gdb_index_symbol_kind |
| symbol_kind (struct partial_symbol *psym) |
| { |
| domain_enum domain = PSYMBOL_DOMAIN (psym); |
| enum address_class aclass = PSYMBOL_CLASS (psym); |
| |
| switch (domain) |
| { |
| case VAR_DOMAIN: |
| switch (aclass) |
| { |
| case LOC_BLOCK: |
| return GDB_INDEX_SYMBOL_KIND_FUNCTION; |
| case LOC_TYPEDEF: |
| return GDB_INDEX_SYMBOL_KIND_TYPE; |
| case LOC_COMPUTED: |
| case LOC_CONST_BYTES: |
| case LOC_OPTIMIZED_OUT: |
| case LOC_STATIC: |
| return GDB_INDEX_SYMBOL_KIND_VARIABLE; |
| case LOC_CONST: |
| /* Note: It's currently impossible to recognize psyms as enum values |
| short of reading the type info. For now punt. */ |
| return GDB_INDEX_SYMBOL_KIND_VARIABLE; |
| default: |
| /* There are other LOC_FOO values that one might want to classify |
| as variables, but dwarf2read.c doesn't currently use them. */ |
| return GDB_INDEX_SYMBOL_KIND_OTHER; |
| } |
| case STRUCT_DOMAIN: |
| return GDB_INDEX_SYMBOL_KIND_TYPE; |
| default: |
| return GDB_INDEX_SYMBOL_KIND_OTHER; |
| } |
| } |
| |
| /* Add a list of partial symbols to SYMTAB. */ |
| |
| static void |
| write_psymbols (struct mapped_symtab *symtab, |
| htab_t psyms_seen, |
| struct partial_symbol **psymp, |
| int count, |
| offset_type cu_index, |
| int is_static) |
| { |
| for (; count-- > 0; ++psymp) |
| { |
| struct partial_symbol *psym = *psymp; |
| void **slot; |
| |
| if (SYMBOL_LANGUAGE (psym) == language_ada) |
| error (_("Ada is not currently supported by the index")); |
| |
| /* Only add a given psymbol once. */ |
| slot = htab_find_slot (psyms_seen, psym, INSERT); |
| if (!*slot) |
| { |
| gdb_index_symbol_kind kind = symbol_kind (psym); |
| |
| *slot = psym; |
| add_index_entry (symtab, SYMBOL_SEARCH_NAME (psym), |
| is_static, kind, cu_index); |
| } |
| } |
| } |
| |
| /* Write the contents of an ("unfinished") obstack to FILE. Throw an |
| exception if there is an error. */ |
| |
| static void |
| write_obstack (FILE *file, struct obstack *obstack) |
| { |
| if (fwrite (obstack_base (obstack), 1, obstack_object_size (obstack), |
| file) |
| != obstack_object_size (obstack)) |
| error (_("couldn't data write to file")); |
| } |
| |
| /* Unlink a file if the argument is not NULL. */ |
| |
| static void |
| unlink_if_set (void *p) |
| { |
| char **filename = (char **) p; |
| if (*filename) |
| unlink (*filename); |
| } |
| |
| /* A helper struct used when iterating over debug_types. */ |
| struct signatured_type_index_data |
| { |
| struct objfile *objfile; |
| struct mapped_symtab *symtab; |
| struct obstack *types_list; |
| htab_t psyms_seen; |
| int cu_index; |
| }; |
| |
| /* A helper function that writes a single signatured_type to an |
| obstack. */ |
| |
| static int |
| write_one_signatured_type (void **slot, void *d) |
| { |
| struct signatured_type_index_data *info |
| = (struct signatured_type_index_data *) d; |
| struct signatured_type *entry = (struct signatured_type *) *slot; |
| struct partial_symtab *psymtab = entry->per_cu.v.psymtab; |
| gdb_byte val[8]; |
| |
| write_psymbols (info->symtab, |
| info->psyms_seen, |
| info->objfile->global_psymbols.list |
| + psymtab->globals_offset, |
| psymtab->n_global_syms, info->cu_index, |
| 0); |
| write_psymbols (info->symtab, |
| info->psyms_seen, |
| info->objfile->static_psymbols.list |
| + psymtab->statics_offset, |
| psymtab->n_static_syms, info->cu_index, |
| 1); |
| |
| store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, |
| entry->per_cu.offset.sect_off); |
| obstack_grow (info->types_list, val, 8); |
| store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, |
| entry->type_offset_in_tu.cu_off); |
| obstack_grow (info->types_list, val, 8); |
| store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, entry->signature); |
| obstack_grow (info->types_list, val, 8); |
| |
| ++info->cu_index; |
| |
| return 1; |
| } |
| |
| /* Recurse into all "included" dependencies and write their symbols as |
| if they appeared in this psymtab. */ |
| |
| static void |
| recursively_write_psymbols (struct objfile *objfile, |
| struct partial_symtab *psymtab, |
| struct mapped_symtab *symtab, |
| htab_t psyms_seen, |
| offset_type cu_index) |
| { |
| int i; |
| |
| for (i = 0; i < psymtab->number_of_dependencies; ++i) |
| if (psymtab->dependencies[i]->user != NULL) |
| recursively_write_psymbols (objfile, psymtab->dependencies[i], |
| symtab, psyms_seen, cu_index); |
| |
| write_psymbols (symtab, |
| psyms_seen, |
| objfile->global_psymbols.list + psymtab->globals_offset, |
| psymtab->n_global_syms, cu_index, |
| 0); |
| write_psymbols (symtab, |
| psyms_seen, |
| objfile->static_psymbols.list + psymtab->statics_offset, |
| psymtab->n_static_syms, cu_index, |
| 1); |
| } |
| |
| /* Create an index file for OBJFILE in the directory DIR. */ |
| |
| static void |
| write_psymtabs_to_index (struct objfile *objfile, const char *dir) |
| { |
| struct cleanup *cleanup; |
| char *filename, *cleanup_filename; |
| struct obstack contents, addr_obstack, constant_pool, symtab_obstack; |
| struct obstack cu_list, types_cu_list; |
| int i; |
| FILE *out_file; |
| struct mapped_symtab *symtab; |
| offset_type val, size_of_contents, total_len; |
| struct stat st; |
| htab_t psyms_seen; |
| htab_t cu_index_htab; |
| struct psymtab_cu_index_map *psymtab_cu_index_map; |
| |
| if (dwarf2_per_objfile->using_index) |
| error (_("Cannot use an index to create the index")); |
| |
| if (VEC_length (dwarf2_section_info_def, dwarf2_per_objfile->types) > 1) |
| error (_("Cannot make an index when the file has multiple .debug_types sections")); |
| |
| if (!objfile->psymtabs || !objfile->psymtabs_addrmap) |
| return; |
| |
| if (stat (objfile_name (objfile), &st) < 0) |
| perror_with_name (objfile_name (objfile)); |
| |
| filename = concat (dir, SLASH_STRING, lbasename (objfile_name (objfile)), |
| INDEX_SUFFIX, (char *) NULL); |
| cleanup = make_cleanup (xfree, filename); |
| |
| out_file = gdb_fopen_cloexec (filename, "wb"); |
| if (!out_file) |
| error (_("Can't open `%s' for writing"), filename); |
| |
| cleanup_filename = filename; |
| make_cleanup (unlink_if_set, &cleanup_filename); |
| |
| symtab = create_mapped_symtab (); |
| make_cleanup (cleanup_mapped_symtab, symtab); |
| |
| obstack_init (&addr_obstack); |
| make_cleanup_obstack_free (&addr_obstack); |
| |
| obstack_init (&cu_list); |
| make_cleanup_obstack_free (&cu_list); |
| |
| obstack_init (&types_cu_list); |
| make_cleanup_obstack_free (&types_cu_list); |
| |
| psyms_seen = htab_create_alloc (100, htab_hash_pointer, htab_eq_pointer, |
| NULL, xcalloc, xfree); |
| make_cleanup_htab_delete (psyms_seen); |
| |
| /* While we're scanning CU's create a table that maps a psymtab pointer |
| (which is what addrmap records) to its index (which is what is recorded |
| in the index file). This will later be needed to write the address |
| table. */ |
| cu_index_htab = htab_create_alloc (100, |
| hash_psymtab_cu_index, |
| eq_psymtab_cu_index, |
| NULL, xcalloc, xfree); |
| make_cleanup_htab_delete (cu_index_htab); |
| psymtab_cu_index_map = XNEWVEC (struct psymtab_cu_index_map, |
| dwarf2_per_objfile->n_comp_units); |
| make_cleanup (xfree, psymtab_cu_index_map); |
| |
| /* The CU list is already sorted, so we don't need to do additional |
| work here. Also, the debug_types entries do not appear in |
| all_comp_units, but only in their own hash table. */ |
| for (i = 0; i < dwarf2_per_objfile->n_comp_units; ++i) |
| { |
| struct dwarf2_per_cu_data *per_cu |
| = dwarf2_per_objfile->all_comp_units[i]; |
| struct partial_symtab *psymtab = per_cu->v.psymtab; |
| gdb_byte val[8]; |
| struct psymtab_cu_index_map *map; |
| void **slot; |
| |
| /* CU of a shared file from 'dwz -m' may be unused by this main file. |
| It may be referenced from a local scope but in such case it does not |
| need to be present in .gdb_index. */ |
| if (psymtab == NULL) |
| continue; |
| |
| if (psymtab->user == NULL) |
| recursively_write_psymbols (objfile, psymtab, symtab, psyms_seen, i); |
| |
| map = &psymtab_cu_index_map[i]; |
| map->psymtab = psymtab; |
| map->cu_index = i; |
| slot = htab_find_slot (cu_index_htab, map, INSERT); |
| gdb_assert (slot != NULL); |
| gdb_assert (*slot == NULL); |
| *slot = map; |
| |
| store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, |
| per_cu->offset.sect_off); |
| obstack_grow (&cu_list, val, 8); |
| store_unsigned_integer (val, 8, BFD_ENDIAN_LITTLE, per_cu->length); |
| obstack_grow (&cu_list, val, 8); |
| } |
| |
| /* Dump the address map. */ |
| write_address_map (objfile, &addr_obstack, cu_index_htab); |
| |
| /* Write out the .debug_type entries, if any. */ |
| if (dwarf2_per_objfile->signatured_types) |
| { |
| struct signatured_type_index_data sig_data; |
| |
| sig_data.objfile = objfile; |
| sig_data.symtab = symtab; |
| sig_data.types_list = &types_cu_list; |
| sig_data.psyms_seen = psyms_seen; |
| sig_data.cu_index = dwarf2_per_objfile->n_comp_units; |
| htab_traverse_noresize (dwarf2_per_objfile->signatured_types, |
| write_one_signatured_type, &sig_data); |
| } |
| |
| /* Now that we've processed all symbols we can shrink their cu_indices |
| lists. */ |
| uniquify_cu_indices (symtab); |
| |
| obstack_init (&constant_pool); |
| make_cleanup_obstack_free (&constant_pool); |
| obstack_init (&symtab_obstack); |
| make_cleanup_obstack_free (&symtab_obstack); |
| write_hash_table (symtab, &symtab_obstack, &constant_pool); |
| |
| obstack_init (&contents); |
| make_cleanup_obstack_free (&contents); |
| size_of_contents = 6 * sizeof (offset_type); |
| total_len = size_of_contents; |
| |
| /* The version number. */ |
| val = MAYBE_SWAP (8); |
| obstack_grow (&contents, &val, sizeof (val)); |
| |
| /* The offset of the CU list from the start of the file. */ |
| val = MAYBE_SWAP (total_len); |
| obstack_grow (&contents, &val, sizeof (val)); |
| total_len += obstack_object_size (&cu_list); |
| |
| /* The offset of the types CU list from the start of the file. */ |
| val = MAYBE_SWAP (total_len); |
| obstack_grow (&contents, &val, sizeof (val)); |
| total_len += obstack_object_size (&types_cu_list); |
| |
| /* The offset of the address table from the start of the file. */ |
| val = MAYBE_SWAP (total_len); |
| obstack_grow (&contents, &val, sizeof (val)); |
| total_len += obstack_object_size (&addr_obstack); |
| |
| /* The offset of the symbol table from the start of the file. */ |
| val = MAYBE_SWAP (total_len); |
| obstack_grow (&contents, &val, sizeof (val)); |
| total_len += obstack_object_size (&symtab_obstack); |
| |
| /* The offset of the constant pool from the start of the file. */ |
| val = MAYBE_SWAP (total_len); |
| obstack_grow (&contents, &val, sizeof (val)); |
| total_len += obstack_object_size (&constant_pool); |
| |
| gdb_assert (obstack_object_size (&contents) == size_of_contents); |
| |
| write_obstack (out_file, &contents); |
| write_obstack (out_file, &cu_list); |
| write_obstack (out_file, &types_cu_list); |
| write_obstack (out_file, &addr_obstack); |
| write_obstack (out_file, &symtab_obstack); |
| write_obstack (out_file, &constant_pool); |
| |
| fclose (out_file); |
| |
| /* We want to keep the file, so we set cleanup_filename to NULL |
| here. See unlink_if_set. */ |
| cleanup_filename = NULL; |
| |
| do_cleanups (cleanup); |
| } |
| |
| /* Implementation of the `save gdb-index' command. |
| |
| Note that the file format used by this command is documented in the |
| GDB manual. Any changes here must be documented there. */ |
| |
| static void |
| save_gdb_index_command (char *arg, int from_tty) |
| { |
| struct objfile *objfile; |
| |
| if (!arg || !*arg) |
| error (_("usage: save gdb-index DIRECTORY")); |
| |
| ALL_OBJFILES (objfile) |
| { |
| struct stat st; |
| |
| /* If the objfile does not correspond to an actual file, skip it. */ |
| if (stat (objfile_name (objfile), &st) < 0) |
| continue; |
| |
| dwarf2_per_objfile |
| = (struct dwarf2_per_objfile *) objfile_data (objfile, |
| dwarf2_objfile_data_key); |
| if (dwarf2_per_objfile) |
| { |
| |
| TRY |
| { |
| write_psymtabs_to_index (objfile, arg); |
| } |
| CATCH (except, RETURN_MASK_ERROR) |
| { |
| exception_fprintf (gdb_stderr, except, |
| _("Error while writing index for `%s': "), |
| objfile_name (objfile)); |
| } |
| END_CATCH |
| } |
| } |
| } |
| |
| |
| |
| int dwarf_always_disassemble; |
| |
| static void |
| show_dwarf_always_disassemble (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| fprintf_filtered (file, |
| _("Whether to always disassemble " |
| "DWARF expressions is %s.\n"), |
| value); |
| } |
| |
| static void |
| show_check_physname (struct ui_file *file, int from_tty, |
| struct cmd_list_element *c, const char *value) |
| { |
| fprintf_filtered (file, |
| _("Whether to check \"physname\" is %s.\n"), |
| value); |
| } |
| |
| void _initialize_dwarf2_read (void); |
| |
| void |
| _initialize_dwarf2_read (void) |
| { |
| struct cmd_list_element *c; |
| |
| dwarf2_objfile_data_key |
| = register_objfile_data_with_cleanup (NULL, dwarf2_per_objfile_free); |
| |
| add_prefix_cmd ("dwarf", class_maintenance, set_dwarf_cmd, _("\ |
| Set DWARF specific variables.\n\ |
| Configure DWARF variables such as the cache size"), |
| &set_dwarf_cmdlist, "maintenance set dwarf ", |
| 0/*allow-unknown*/, &maintenance_set_cmdlist); |
| |
| add_prefix_cmd ("dwarf", class_maintenance, show_dwarf_cmd, _("\ |
| Show DWARF specific variables\n\ |
| Show DWARF variables such as the cache size"), |
| &show_dwarf_cmdlist, "maintenance show dwarf ", |
| 0/*allow-unknown*/, &maintenance_show_cmdlist); |
| |
| add_setshow_zinteger_cmd ("max-cache-age", class_obscure, |
| &dwarf_max_cache_age, _("\ |
| Set the upper bound on the age of cached DWARF compilation units."), _("\ |
| Show the upper bound on the age of cached DWARF compilation units."), _("\ |
| A higher limit means that cached compilation units will be stored\n\ |
| in memory longer, and more total memory will be used. Zero disables\n\ |
| caching, which can slow down startup."), |
| NULL, |
| show_dwarf_max_cache_age, |
| &set_dwarf_cmdlist, |
| &show_dwarf_cmdlist); |
| |
| add_setshow_boolean_cmd ("always-disassemble", class_obscure, |
| &dwarf_always_disassemble, _("\ |
| Set whether `info address' always disassembles DWARF expressions."), _("\ |
| Show whether `info address' always disassembles DWARF expressions."), _("\ |
| When enabled, DWARF expressions are always printed in an assembly-like\n\ |
| syntax. When disabled, expressions will be printed in a more\n\ |
| conversational style, when possible."), |
| NULL, |
| show_dwarf_always_disassemble, |
| &set_dwarf_cmdlist, |
| &show_dwarf_cmdlist); |
| |
| add_setshow_zuinteger_cmd ("dwarf-read", no_class, &dwarf_read_debug, _("\ |
| Set debugging of the DWARF reader."), _("\ |
| Show debugging of the DWARF reader."), _("\ |
| When enabled (non-zero), debugging messages are printed during DWARF\n\ |
| reading and symtab expansion. A value of 1 (one) provides basic\n\ |
| information. A value greater than 1 provides more verbose information."), |
| NULL, |
| NULL, |
| &setdebuglist, &showdebuglist); |
| |
| add_setshow_zuinteger_cmd ("dwarf-die", no_class, &dwarf_die_debug, _("\ |
| Set debugging of the DWARF DIE reader."), _("\ |
| Show debugging of the DWARF DIE reader."), _("\ |
| When enabled (non-zero), DIEs are dumped after they are read in.\n\ |
| The value is the maximum depth to print."), |
| NULL, |
| NULL, |
| &setdebuglist, &showdebuglist); |
| |
| add_setshow_zuinteger_cmd ("dwarf-line", no_class, &dwarf_line_debug, _("\ |
| Set debugging of the dwarf line reader."), _("\ |
| Show debugging of the dwarf line reader."), _("\ |
| When enabled (non-zero), line number entries are dumped as they are read in.\n\ |
| A value of 1 (one) provides basic information.\n\ |
| A value greater than 1 provides more verbose information."), |
| NULL, |
| NULL, |
| &setdebuglist, &showdebuglist); |
| |
| add_setshow_boolean_cmd ("check-physname", no_class, &check_physname, _("\ |
| Set cross-checking of \"physname\" code against demangler."), _("\ |
| Show cross-checking of \"physname\" code against demangler."), _("\ |
| When enabled, GDB's internal \"physname\" code is checked against\n\ |
| the demangler."), |
| NULL, show_check_physname, |
| &setdebuglist, &showdebuglist); |
| |
| add_setshow_boolean_cmd ("use-deprecated-index-sections", |
| no_class, &use_deprecated_index_sections, _("\ |
| Set whether to use deprecated gdb_index sections."), _("\ |
| Show whether to use deprecated gdb_index sections."), _("\ |
| When enabled, deprecated .gdb_index sections are used anyway.\n\ |
| Normally they are ignored either because of a missing feature or\n\ |
| performance issue.\n\ |
| Warning: This option must be enabled before gdb reads the file."), |
| NULL, |
| NULL, |
| &setlist, &showlist); |
| |
| c = add_cmd ("gdb-index", class_files, save_gdb_index_command, |
| _("\ |
| Save a gdb-index file.\n\ |
| Usage: save gdb-index DIRECTORY"), |
| &save_cmdlist); |
| set_cmd_completer (c, filename_completer); |
| |
| dwarf2_locexpr_index = register_symbol_computed_impl (LOC_COMPUTED, |
| &dwarf2_locexpr_funcs); |
| dwarf2_loclist_index = register_symbol_computed_impl (LOC_COMPUTED, |
| &dwarf2_loclist_funcs); |
| |
| dwarf2_locexpr_block_index = register_symbol_block_impl (LOC_BLOCK, |
| &dwarf2_block_frame_base_locexpr_funcs); |
| dwarf2_loclist_block_index = register_symbol_block_impl (LOC_BLOCK, |
| &dwarf2_block_frame_base_loclist_funcs); |
| } |