blob: 33370aca7d357a51e4e33502a245eef10fefd3ae [file] [log] [blame]
/* DWARF 2 support.
Copyright (C) 1994-2016 Free Software Foundation, Inc.
Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
(gavin@cygnus.com).
From the dwarf2read.c header:
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 in dwarfread.c
This file is part of BFD.
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, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libiberty.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "dwarf2.h"
/* The data in the .debug_line statement prologue looks like this. */
struct line_head
{
bfd_vma total_length;
unsigned short version;
bfd_vma prologue_length;
unsigned char minimum_instruction_length;
unsigned char maximum_ops_per_insn;
unsigned char default_is_stmt;
int line_base;
unsigned char line_range;
unsigned char opcode_base;
unsigned char *standard_opcode_lengths;
};
/* Attributes have a name and a value. */
struct attribute
{
enum dwarf_attribute name;
enum dwarf_form form;
union
{
char *str;
struct dwarf_block *blk;
bfd_uint64_t val;
bfd_int64_t sval;
}
u;
};
/* Blocks are a bunch of untyped bytes. */
struct dwarf_block
{
unsigned int size;
bfd_byte *data;
};
struct adjusted_section
{
asection *section;
bfd_vma adj_vma;
};
struct dwarf2_debug
{
/* A list of all previously read comp_units. */
struct comp_unit *all_comp_units;
/* Last comp unit in list above. */
struct comp_unit *last_comp_unit;
/* Names of the debug sections. */
const struct dwarf_debug_section *debug_sections;
/* The next unread compilation unit within the .debug_info section.
Zero indicates that the .debug_info section has not been loaded
into a buffer yet. */
bfd_byte *info_ptr;
/* Pointer to the end of the .debug_info section memory buffer. */
bfd_byte *info_ptr_end;
/* Pointer to the bfd, section and address of the beginning of the
section. The bfd might be different than expected because of
gnu_debuglink sections. */
bfd *bfd_ptr;
asection *sec;
bfd_byte *sec_info_ptr;
/* Support for alternate debug info sections created by the DWZ utility:
This includes a pointer to an alternate bfd which contains *extra*,
possibly duplicate debug sections, and pointers to the loaded
.debug_str and .debug_info sections from this bfd. */
bfd * alt_bfd_ptr;
bfd_byte * alt_dwarf_str_buffer;
bfd_size_type alt_dwarf_str_size;
bfd_byte * alt_dwarf_info_buffer;
bfd_size_type alt_dwarf_info_size;
/* A pointer to the memory block allocated for info_ptr. Neither
info_ptr nor sec_info_ptr are guaranteed to stay pointing to the
beginning of the malloc block. This is used only to free the
memory later. */
bfd_byte *info_ptr_memory;
/* Pointer to the symbol table. */
asymbol **syms;
/* Pointer to the .debug_abbrev section loaded into memory. */
bfd_byte *dwarf_abbrev_buffer;
/* Length of the loaded .debug_abbrev section. */
bfd_size_type dwarf_abbrev_size;
/* Buffer for decode_line_info. */
bfd_byte *dwarf_line_buffer;
/* Length of the loaded .debug_line section. */
bfd_size_type dwarf_line_size;
/* Pointer to the .debug_str section loaded into memory. */
bfd_byte *dwarf_str_buffer;
/* Length of the loaded .debug_str section. */
bfd_size_type dwarf_str_size;
/* Pointer to the .debug_ranges section loaded into memory. */
bfd_byte *dwarf_ranges_buffer;
/* Length of the loaded .debug_ranges section. */
bfd_size_type dwarf_ranges_size;
/* If the most recent call to bfd_find_nearest_line was given an
address in an inlined function, preserve a pointer into the
calling chain for subsequent calls to bfd_find_inliner_info to
use. */
struct funcinfo *inliner_chain;
/* Section VMAs at the time the stash was built. */
bfd_vma *sec_vma;
/* Number of sections whose VMA we must adjust. */
int adjusted_section_count;
/* Array of sections with adjusted VMA. */
struct adjusted_section *adjusted_sections;
/* Number of times find_line is called. This is used in
the heuristic for enabling the info hash tables. */
int info_hash_count;
#define STASH_INFO_HASH_TRIGGER 100
/* Hash table mapping symbol names to function infos. */
struct info_hash_table *funcinfo_hash_table;
/* Hash table mapping symbol names to variable infos. */
struct info_hash_table *varinfo_hash_table;
/* Head of comp_unit list in the last hash table update. */
struct comp_unit *hash_units_head;
/* Status of info hash. */
int info_hash_status;
#define STASH_INFO_HASH_OFF 0
#define STASH_INFO_HASH_ON 1
#define STASH_INFO_HASH_DISABLED 2
/* True if we opened bfd_ptr. */
bfd_boolean close_on_cleanup;
};
struct arange
{
struct arange *next;
bfd_vma low;
bfd_vma high;
};
/* A minimal decoding of DWARF2 compilation units. We only decode
what's needed to get to the line number information. */
struct comp_unit
{
/* Chain the previously read compilation units. */
struct comp_unit *next_unit;
/* Likewise, chain the compilation unit read after this one.
The comp units are stored in reversed reading order. */
struct comp_unit *prev_unit;
/* Keep the bfd convenient (for memory allocation). */
bfd *abfd;
/* The lowest and highest addresses contained in this compilation
unit as specified in the compilation unit header. */
struct arange arange;
/* The DW_AT_name attribute (for error messages). */
char *name;
/* The abbrev hash table. */
struct abbrev_info **abbrevs;
/* DW_AT_language. */
int lang;
/* Note that an error was found by comp_unit_find_nearest_line. */
int error;
/* The DW_AT_comp_dir attribute. */
char *comp_dir;
/* TRUE if there is a line number table associated with this comp. unit. */
int stmtlist;
/* Pointer to the current comp_unit so that we can find a given entry
by its reference. */
bfd_byte *info_ptr_unit;
/* Pointer to the start of the debug section, for DW_FORM_ref_addr. */
bfd_byte *sec_info_ptr;
/* The offset into .debug_line of the line number table. */
unsigned long line_offset;
/* Pointer to the first child die for the comp unit. */
bfd_byte *first_child_die_ptr;
/* The end of the comp unit. */
bfd_byte *end_ptr;
/* The decoded line number, NULL if not yet decoded. */
struct line_info_table *line_table;
/* A list of the functions found in this comp. unit. */
struct funcinfo *function_table;
/* A list of the variables found in this comp. unit. */
struct varinfo *variable_table;
/* Pointer to dwarf2_debug structure. */
struct dwarf2_debug *stash;
/* DWARF format version for this unit - from unit header. */
int version;
/* Address size for this unit - from unit header. */
unsigned char addr_size;
/* Offset size for this unit - from unit header. */
unsigned char offset_size;
/* Base address for this unit - from DW_AT_low_pc attribute of
DW_TAG_compile_unit DIE */
bfd_vma base_address;
/* TRUE if symbols are cached in hash table for faster lookup by name. */
bfd_boolean cached;
};
/* This data structure holds the information of an abbrev. */
struct abbrev_info
{
unsigned int number; /* Number identifying abbrev. */
enum dwarf_tag tag; /* DWARF tag. */
int has_children; /* Boolean. */
unsigned int 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 dwarf_attribute name;
enum dwarf_form form;
};
/* Map of uncompressed DWARF debug section name to compressed one. It
is terminated by NULL uncompressed_name. */
const struct dwarf_debug_section dwarf_debug_sections[] =
{
{ ".debug_abbrev", ".zdebug_abbrev" },
{ ".debug_aranges", ".zdebug_aranges" },
{ ".debug_frame", ".zdebug_frame" },
{ ".debug_info", ".zdebug_info" },
{ ".debug_info", ".zdebug_info" },
{ ".debug_line", ".zdebug_line" },
{ ".debug_loc", ".zdebug_loc" },
{ ".debug_macinfo", ".zdebug_macinfo" },
{ ".debug_macro", ".zdebug_macro" },
{ ".debug_pubnames", ".zdebug_pubnames" },
{ ".debug_pubtypes", ".zdebug_pubtypes" },
{ ".debug_ranges", ".zdebug_ranges" },
{ ".debug_static_func", ".zdebug_static_func" },
{ ".debug_static_vars", ".zdebug_static_vars" },
{ ".debug_str", ".zdebug_str", },
{ ".debug_str", ".zdebug_str", },
{ ".debug_types", ".zdebug_types" },
/* GNU DWARF 1 extensions */
{ ".debug_sfnames", ".zdebug_sfnames" },
{ ".debug_srcinfo", ".zebug_srcinfo" },
/* SGI/MIPS DWARF 2 extensions */
{ ".debug_funcnames", ".zdebug_funcnames" },
{ ".debug_typenames", ".zdebug_typenames" },
{ ".debug_varnames", ".zdebug_varnames" },
{ ".debug_weaknames", ".zdebug_weaknames" },
{ NULL, NULL },
};
/* NB/ Numbers in this enum must match up with indicies
into the dwarf_debug_sections[] array above. */
enum dwarf_debug_section_enum
{
debug_abbrev = 0,
debug_aranges,
debug_frame,
debug_info,
debug_info_alt,
debug_line,
debug_loc,
debug_macinfo,
debug_macro,
debug_pubnames,
debug_pubtypes,
debug_ranges,
debug_static_func,
debug_static_vars,
debug_str,
debug_str_alt,
debug_types,
debug_sfnames,
debug_srcinfo,
debug_funcnames,
debug_typenames,
debug_varnames,
debug_weaknames
};
#ifndef ABBREV_HASH_SIZE
#define ABBREV_HASH_SIZE 121
#endif
#ifndef ATTR_ALLOC_CHUNK
#define ATTR_ALLOC_CHUNK 4
#endif
/* Variable and function hash tables. This is used to speed up look-up
in lookup_symbol_in_var_table() and lookup_symbol_in_function_table().
In order to share code between variable and function infos, we use
a list of untyped pointer for all variable/function info associated with
a symbol. We waste a bit of memory for list with one node but that
simplifies the code. */
struct info_list_node
{
struct info_list_node *next;
void *info;
};
/* Info hash entry. */
struct info_hash_entry
{
struct bfd_hash_entry root;
struct info_list_node *head;
};
struct info_hash_table
{
struct bfd_hash_table base;
};
/* Function to create a new entry in info hash table. */
static struct bfd_hash_entry *
info_hash_table_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
struct info_hash_entry *ret = (struct info_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
derived class. */
if (ret == NULL)
{
ret = (struct info_hash_entry *) bfd_hash_allocate (table,
sizeof (* ret));
if (ret == NULL)
return NULL;
}
/* Call the allocation method of the base class. */
ret = ((struct info_hash_entry *)
bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
/* Initialize the local fields here. */
if (ret)
ret->head = NULL;
return (struct bfd_hash_entry *) ret;
}
/* Function to create a new info hash table. It returns a pointer to the
newly created table or NULL if there is any error. We need abfd
solely for memory allocation. */
static struct info_hash_table *
create_info_hash_table (bfd *abfd)
{
struct info_hash_table *hash_table;
hash_table = ((struct info_hash_table *)
bfd_alloc (abfd, sizeof (struct info_hash_table)));
if (!hash_table)
return hash_table;
if (!bfd_hash_table_init (&hash_table->base, info_hash_table_newfunc,
sizeof (struct info_hash_entry)))
{
bfd_release (abfd, hash_table);
return NULL;
}
return hash_table;
}
/* Insert an info entry into an info hash table. We do not check of
duplicate entries. Also, the caller need to guarantee that the
right type of info in inserted as info is passed as a void* pointer.
This function returns true if there is no error. */
static bfd_boolean
insert_info_hash_table (struct info_hash_table *hash_table,
const char *key,
void *info,
bfd_boolean copy_p)
{
struct info_hash_entry *entry;
struct info_list_node *node;
entry = (struct info_hash_entry*) bfd_hash_lookup (&hash_table->base,
key, TRUE, copy_p);
if (!entry)
return FALSE;
node = (struct info_list_node *) bfd_hash_allocate (&hash_table->base,
sizeof (*node));
if (!node)
return FALSE;
node->info = info;
node->next = entry->head;
entry->head = node;
return TRUE;
}
/* Look up an info entry list from an info hash table. Return NULL
if there is none. */
static struct info_list_node *
lookup_info_hash_table (struct info_hash_table *hash_table, const char *key)
{
struct info_hash_entry *entry;
entry = (struct info_hash_entry*) bfd_hash_lookup (&hash_table->base, key,
FALSE, FALSE);
return entry ? entry->head : NULL;
}
/* Read a section into its appropriate place in the dwarf2_debug
struct (indicated by SECTION_BUFFER and SECTION_SIZE). If SYMS is
not NULL, use bfd_simple_get_relocated_section_contents to read the
section contents, otherwise use bfd_get_section_contents. Fail if
the located section does not contain at least OFFSET bytes. */
static bfd_boolean
read_section (bfd * abfd,
const struct dwarf_debug_section *sec,
asymbol ** syms,
bfd_uint64_t offset,
bfd_byte ** section_buffer,
bfd_size_type * section_size)
{
asection *msec;
const char *section_name = sec->uncompressed_name;
/* The section may have already been read. */
if (*section_buffer == NULL)
{
msec = bfd_get_section_by_name (abfd, section_name);
if (! msec)
{
section_name = sec->compressed_name;
if (section_name != NULL)
msec = bfd_get_section_by_name (abfd, section_name);
}
if (! msec)
{
(*_bfd_error_handler) (_("Dwarf Error: Can't find %s section."),
sec->uncompressed_name);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
*section_size = msec->rawsize ? msec->rawsize : msec->size;
if (syms)
{
*section_buffer
= bfd_simple_get_relocated_section_contents (abfd, msec, NULL, syms);
if (! *section_buffer)
return FALSE;
}
else
{
*section_buffer = (bfd_byte *) bfd_malloc (*section_size);
if (! *section_buffer)
return FALSE;
if (! bfd_get_section_contents (abfd, msec, *section_buffer,
0, *section_size))
return FALSE;
}
}
/* It is possible to get a bad value for the offset into the section
that the client wants. Validate it here to avoid trouble later. */
if (offset != 0 && offset >= *section_size)
{
(*_bfd_error_handler) (_("Dwarf Error: Offset (%lu)"
" greater than or equal to %s size (%lu)."),
(long) offset, section_name, *section_size);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
return TRUE;
}
/* Read dwarf information from a buffer. */
static unsigned int
read_1_byte (bfd *abfd ATTRIBUTE_UNUSED, bfd_byte *buf, bfd_byte *end)
{
if (buf + 1 > end)
return 0;
return bfd_get_8 (abfd, buf);
}
static int
read_1_signed_byte (bfd *abfd ATTRIBUTE_UNUSED, bfd_byte *buf, bfd_byte *end)
{
if (buf + 1 > end)
return 0;
return bfd_get_signed_8 (abfd, buf);
}
static unsigned int
read_2_bytes (bfd *abfd, bfd_byte *buf, bfd_byte *end)
{
if (buf + 2 > end)
return 0;
return bfd_get_16 (abfd, buf);
}
static unsigned int
read_4_bytes (bfd *abfd, bfd_byte *buf, bfd_byte *end)
{
if (buf + 4 > end)
return 0;
return bfd_get_32 (abfd, buf);
}
static bfd_uint64_t
read_8_bytes (bfd *abfd, bfd_byte *buf, bfd_byte *end)
{
if (buf + 8 > end)
return 0;
return bfd_get_64 (abfd, buf);
}
static bfd_byte *
read_n_bytes (bfd *abfd ATTRIBUTE_UNUSED,
bfd_byte *buf,
bfd_byte *end,
unsigned int size ATTRIBUTE_UNUSED)
{
if (buf + size > end)
return NULL;
return buf;
}
/* Scans a NUL terminated string starting at BUF, returning a pointer to it.
Returns the number of characters in the string, *including* the NUL byte,
in BYTES_READ_PTR. This value is set even if the function fails. Bytes
at or beyond BUF_END will not be read. Returns NULL if there was a
problem, or if the string is empty. */
static char *
read_string (bfd * abfd ATTRIBUTE_UNUSED,
bfd_byte * buf,
bfd_byte * buf_end,
unsigned int * bytes_read_ptr)
{
bfd_byte *str = buf;
if (buf >= buf_end)
{
* bytes_read_ptr = 0;
return NULL;
}
if (*str == '\0')
{
* bytes_read_ptr = 1;
return NULL;
}
while (buf < buf_end)
if (* buf ++ == 0)
{
* bytes_read_ptr = buf - str;
return (char *) str;
}
* bytes_read_ptr = buf - str;
return NULL;
}
/* Reads an offset from BUF and then locates the string at this offset
inside the debug string section. Returns a pointer to the string.
Returns the number of bytes read from BUF, *not* the length of the string,
in BYTES_READ_PTR. This value is set even if the function fails. Bytes
at or beyond BUF_END will not be read from BUF. Returns NULL if there was
a problem, or if the string is empty. Does not check for NUL termination
of the string. */
static char *
read_indirect_string (struct comp_unit * unit,
bfd_byte * buf,
bfd_byte * buf_end,
unsigned int * bytes_read_ptr)
{
bfd_uint64_t offset;
struct dwarf2_debug *stash = unit->stash;
char *str;
if (buf + unit->offset_size > buf_end)
{
* bytes_read_ptr = 0;
return NULL;
}
if (unit->offset_size == 4)
offset = read_4_bytes (unit->abfd, buf, buf_end);
else
offset = read_8_bytes (unit->abfd, buf, buf_end);
*bytes_read_ptr = unit->offset_size;
if (! read_section (unit->abfd, &stash->debug_sections[debug_str],
stash->syms, offset,
&stash->dwarf_str_buffer, &stash->dwarf_str_size))
return NULL;
if (offset >= stash->dwarf_str_size)
return NULL;
str = (char *) stash->dwarf_str_buffer + offset;
if (*str == '\0')
return NULL;
return str;
}
/* Like read_indirect_string but uses a .debug_str located in
an alternate file pointed to by the .gnu_debugaltlink section.
Used to impement DW_FORM_GNU_strp_alt. */
static char *
read_alt_indirect_string (struct comp_unit * unit,
bfd_byte * buf,
bfd_byte * buf_end,
unsigned int * bytes_read_ptr)
{
bfd_uint64_t offset;
struct dwarf2_debug *stash = unit->stash;
char *str;
if (buf + unit->offset_size > buf_end)
{
* bytes_read_ptr = 0;
return NULL;
}
if (unit->offset_size == 4)
offset = read_4_bytes (unit->abfd, buf, buf_end);
else
offset = read_8_bytes (unit->abfd, buf, buf_end);
*bytes_read_ptr = unit->offset_size;
if (stash->alt_bfd_ptr == NULL)
{
bfd * debug_bfd;
char * debug_filename = bfd_follow_gnu_debugaltlink (unit->abfd, DEBUGDIR);
if (debug_filename == NULL)
return NULL;
if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL
|| ! bfd_check_format (debug_bfd, bfd_object))
{
if (debug_bfd)
bfd_close (debug_bfd);
/* FIXME: Should we report our failure to follow the debuglink ? */
free (debug_filename);
return NULL;
}
stash->alt_bfd_ptr = debug_bfd;
}
if (! read_section (unit->stash->alt_bfd_ptr,
stash->debug_sections + debug_str_alt,
NULL, /* FIXME: Do we need to load alternate symbols ? */
offset,
&stash->alt_dwarf_str_buffer,
&stash->alt_dwarf_str_size))
return NULL;
if (offset >= stash->alt_dwarf_str_size)
return NULL;
str = (char *) stash->alt_dwarf_str_buffer + offset;
if (*str == '\0')
return NULL;
return str;
}
/* Resolve an alternate reference from UNIT at OFFSET.
Returns a pointer into the loaded alternate CU upon success
or NULL upon failure. */
static bfd_byte *
read_alt_indirect_ref (struct comp_unit * unit,
bfd_uint64_t offset)
{
struct dwarf2_debug *stash = unit->stash;
if (stash->alt_bfd_ptr == NULL)
{
bfd * debug_bfd;
char * debug_filename = bfd_follow_gnu_debugaltlink (unit->abfd, DEBUGDIR);
if (debug_filename == NULL)
return FALSE;
if ((debug_bfd = bfd_openr (debug_filename, NULL)) == NULL
|| ! bfd_check_format (debug_bfd, bfd_object))
{
if (debug_bfd)
bfd_close (debug_bfd);
/* FIXME: Should we report our failure to follow the debuglink ? */
free (debug_filename);
return NULL;
}
stash->alt_bfd_ptr = debug_bfd;
}
if (! read_section (unit->stash->alt_bfd_ptr,
stash->debug_sections + debug_info_alt,
NULL, /* FIXME: Do we need to load alternate symbols ? */
offset,
&stash->alt_dwarf_info_buffer,
&stash->alt_dwarf_info_size))
return NULL;
if (offset >= stash->alt_dwarf_info_size)
return NULL;
return stash->alt_dwarf_info_buffer + offset;
}
static bfd_uint64_t
read_address (struct comp_unit *unit, bfd_byte *buf, bfd_byte * buf_end)
{
int signed_vma = 0;
if (bfd_get_flavour (unit->abfd) == bfd_target_elf_flavour)
signed_vma = get_elf_backend_data (unit->abfd)->sign_extend_vma;
if (buf + unit->addr_size > buf_end)
return 0;
if (signed_vma)
{
switch (unit->addr_size)
{
case 8:
return bfd_get_signed_64 (unit->abfd, buf);
case 4:
return bfd_get_signed_32 (unit->abfd, buf);
case 2:
return bfd_get_signed_16 (unit->abfd, buf);
default:
abort ();
}
}
else
{
switch (unit->addr_size)
{
case 8:
return bfd_get_64 (unit->abfd, buf);
case 4:
return bfd_get_32 (unit->abfd, buf);
case 2:
return bfd_get_16 (unit->abfd, buf);
default:
abort ();
}
}
}
/* Lookup an abbrev_info structure in the abbrev hash table. */
static struct abbrev_info *
lookup_abbrev (unsigned int number, struct abbrev_info **abbrevs)
{
unsigned int hash_number;
struct abbrev_info *abbrev;
hash_number = number % ABBREV_HASH_SIZE;
abbrev = abbrevs[hash_number];
while (abbrev)
{
if (abbrev->number == number)
return abbrev;
else
abbrev = abbrev->next;
}
return NULL;
}
/* 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. */
static struct abbrev_info**
read_abbrevs (bfd *abfd, bfd_uint64_t offset, struct dwarf2_debug *stash)
{
struct abbrev_info **abbrevs;
bfd_byte *abbrev_ptr;
bfd_byte *abbrev_end;
struct abbrev_info *cur_abbrev;
unsigned int abbrev_number, bytes_read, abbrev_name;
unsigned int abbrev_form, hash_number;
bfd_size_type amt;
if (! read_section (abfd, &stash->debug_sections[debug_abbrev],
stash->syms, offset,
&stash->dwarf_abbrev_buffer, &stash->dwarf_abbrev_size))
return NULL;
if (offset >= stash->dwarf_abbrev_size)
return NULL;
amt = sizeof (struct abbrev_info*) * ABBREV_HASH_SIZE;
abbrevs = (struct abbrev_info **) bfd_zalloc (abfd, amt);
if (abbrevs == NULL)
return NULL;
abbrev_ptr = stash->dwarf_abbrev_buffer + offset;
abbrev_end = stash->dwarf_abbrev_buffer + stash->dwarf_abbrev_size;
abbrev_number = safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
/* Loop until we reach an abbrev number of 0. */
while (abbrev_number)
{
amt = sizeof (struct abbrev_info);
cur_abbrev = (struct abbrev_info *) bfd_zalloc (abfd, amt);
if (cur_abbrev == NULL)
return NULL;
/* Read in abbrev header. */
cur_abbrev->number = abbrev_number;
cur_abbrev->tag = (enum dwarf_tag)
safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr, abbrev_end);
abbrev_ptr += 1;
/* Now read in declarations. */
abbrev_name = safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
abbrev_form = safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
while (abbrev_name)
{
if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
{
struct attr_abbrev *tmp;
amt = cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK;
amt *= sizeof (struct attr_abbrev);
tmp = (struct attr_abbrev *) bfd_realloc (cur_abbrev->attrs, amt);
if (tmp == NULL)
{
size_t i;
for (i = 0; i < ABBREV_HASH_SIZE; i++)
{
struct abbrev_info *abbrev = abbrevs[i];
while (abbrev)
{
free (abbrev->attrs);
abbrev = abbrev->next;
}
}
return NULL;
}
cur_abbrev->attrs = tmp;
}
cur_abbrev->attrs[cur_abbrev->num_attrs].name
= (enum dwarf_attribute) abbrev_name;
cur_abbrev->attrs[cur_abbrev->num_attrs++].form
= (enum dwarf_form) abbrev_form;
abbrev_name = safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
abbrev_form = safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
}
hash_number = abbrev_number % ABBREV_HASH_SIZE;
cur_abbrev->next = abbrevs[hash_number];
abbrevs[hash_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 - stash->dwarf_abbrev_buffer)
>= stash->dwarf_abbrev_size)
break;
abbrev_number = safe_read_leb128 (abfd, abbrev_ptr, &bytes_read, FALSE, abbrev_end);
abbrev_ptr += bytes_read;
if (lookup_abbrev (abbrev_number, abbrevs) != NULL)
break;
}
return abbrevs;
}
/* Returns true if the form is one which has a string value. */
static inline bfd_boolean
is_str_attr (enum dwarf_form form)
{
return form == DW_FORM_string || form == DW_FORM_strp || form == DW_FORM_GNU_strp_alt;
}
/* Read and fill in the value of attribute ATTR as described by FORM.
Read data starting from INFO_PTR, but never at or beyond INFO_PTR_END.
Returns an updated INFO_PTR taking into account the amount of data read. */
static bfd_byte *
read_attribute_value (struct attribute * attr,
unsigned form,
struct comp_unit * unit,
bfd_byte * info_ptr,
bfd_byte * info_ptr_end)
{
bfd *abfd = unit->abfd;
unsigned int bytes_read;
struct dwarf_block *blk;
bfd_size_type amt;
if (info_ptr >= info_ptr_end && form != DW_FORM_flag_present)
{
(*_bfd_error_handler) (_("Dwarf Error: Info pointer extends beyond end of attributes"));
bfd_set_error (bfd_error_bad_value);
return info_ptr;
}
attr->form = (enum dwarf_form) form;
switch (form)
{
case DW_FORM_ref_addr:
/* DW_FORM_ref_addr is an address in DWARF2, and an offset in
DWARF3. */
if (unit->version == 3 || unit->version == 4)
{
if (unit->offset_size == 4)
attr->u.val = read_4_bytes (unit->abfd, info_ptr, info_ptr_end);
else
attr->u.val = read_8_bytes (unit->abfd, info_ptr, info_ptr_end);
info_ptr += unit->offset_size;
break;
}
/* FALLTHROUGH */
case DW_FORM_addr:
attr->u.val = read_address (unit, info_ptr, info_ptr_end);
info_ptr += unit->addr_size;
break;
case DW_FORM_GNU_ref_alt:
case DW_FORM_sec_offset:
if (unit->offset_size == 4)
attr->u.val = read_4_bytes (unit->abfd, info_ptr, info_ptr_end);
else
attr->u.val = read_8_bytes (unit->abfd, info_ptr, info_ptr_end);
info_ptr += unit->offset_size;
break;
case DW_FORM_block2:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
if (blk == NULL)
return NULL;
blk->size = read_2_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 2;
blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
info_ptr += blk->size;
attr->u.blk = blk;
break;
case DW_FORM_block4:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
if (blk == NULL)
return NULL;
blk->size = read_4_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 4;
blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
info_ptr += blk->size;
attr->u.blk = blk;
break;
case DW_FORM_data2:
attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 2;
break;
case DW_FORM_data4:
attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 4;
break;
case DW_FORM_data8:
attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 8;
break;
case DW_FORM_string:
attr->u.str = read_string (abfd, info_ptr, info_ptr_end, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_strp:
attr->u.str = read_indirect_string (unit, info_ptr, info_ptr_end, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_GNU_strp_alt:
attr->u.str = read_alt_indirect_string (unit, info_ptr, info_ptr_end, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_exprloc:
case DW_FORM_block:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
if (blk == NULL)
return NULL;
blk->size = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
info_ptr += bytes_read;
blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
info_ptr += blk->size;
attr->u.blk = blk;
break;
case DW_FORM_block1:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
if (blk == NULL)
return NULL;
blk->size = read_1_byte (abfd, info_ptr, info_ptr_end);
info_ptr += 1;
blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
info_ptr += blk->size;
attr->u.blk = blk;
break;
case DW_FORM_data1:
attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
info_ptr += 1;
break;
case DW_FORM_flag:
attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
info_ptr += 1;
break;
case DW_FORM_flag_present:
attr->u.val = 1;
break;
case DW_FORM_sdata:
attr->u.sval = safe_read_leb128 (abfd, info_ptr, &bytes_read, TRUE, info_ptr_end);
info_ptr += bytes_read;
break;
case DW_FORM_udata:
attr->u.val = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
info_ptr += bytes_read;
break;
case DW_FORM_ref1:
attr->u.val = read_1_byte (abfd, info_ptr, info_ptr_end);
info_ptr += 1;
break;
case DW_FORM_ref2:
attr->u.val = read_2_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 2;
break;
case DW_FORM_ref4:
attr->u.val = read_4_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 4;
break;
case DW_FORM_ref8:
attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 8;
break;
case DW_FORM_ref_sig8:
attr->u.val = read_8_bytes (abfd, info_ptr, info_ptr_end);
info_ptr += 8;
break;
case DW_FORM_ref_udata:
attr->u.val = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
info_ptr += bytes_read;
break;
case DW_FORM_indirect:
form = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
info_ptr += bytes_read;
info_ptr = read_attribute_value (attr, form, unit, info_ptr, info_ptr_end);
break;
default:
(*_bfd_error_handler) (_("Dwarf Error: Invalid or unhandled FORM value: %#x."),
form);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
return info_ptr;
}
/* Read an attribute described by an abbreviated attribute. */
static bfd_byte *
read_attribute (struct attribute * attr,
struct attr_abbrev * abbrev,
struct comp_unit * unit,
bfd_byte * info_ptr,
bfd_byte * info_ptr_end)
{
attr->name = abbrev->name;
info_ptr = read_attribute_value (attr, abbrev->form, unit, info_ptr, info_ptr_end);
return info_ptr;
}
/* Return whether DW_AT_name will return the same as DW_AT_linkage_name
for a function. */
static bfd_boolean
non_mangled (int lang)
{
switch (lang)
{
default:
return FALSE;
case DW_LANG_C89:
case DW_LANG_C:
case DW_LANG_Ada83:
case DW_LANG_Cobol74:
case DW_LANG_Cobol85:
case DW_LANG_Fortran77:
case DW_LANG_Pascal83:
case DW_LANG_C99:
case DW_LANG_Ada95:
case DW_LANG_PLI:
case DW_LANG_UPC:
case DW_LANG_C11:
return TRUE;
}
}
/* Source line information table routines. */
#define FILE_ALLOC_CHUNK 5
#define DIR_ALLOC_CHUNK 5
struct line_info
{
struct line_info* prev_line;
bfd_vma address;
char *filename;
unsigned int line;
unsigned int column;
unsigned int discriminator;
unsigned char op_index;
unsigned char end_sequence; /* End of (sequential) code sequence. */
};
struct fileinfo
{
char *name;
unsigned int dir;
unsigned int time;
unsigned int size;
};
struct line_sequence
{
bfd_vma low_pc;
struct line_sequence* prev_sequence;
struct line_info* last_line; /* Largest VMA. */
};
struct line_info_table
{
bfd* abfd;
unsigned int num_files;
unsigned int num_dirs;
unsigned int num_sequences;
char * comp_dir;
char ** dirs;
struct fileinfo* files;
struct line_sequence* sequences;
struct line_info* lcl_head; /* Local head; used in 'add_line_info'. */
};
/* Remember some information about each function. If the function is
inlined (DW_TAG_inlined_subroutine) it may have two additional
attributes, DW_AT_call_file and DW_AT_call_line, which specify the
source code location where this function was inlined. */
struct funcinfo
{
/* Pointer to previous function in list of all functions. */
struct funcinfo *prev_func;
/* Pointer to function one scope higher. */
struct funcinfo *caller_func;
/* Source location file name where caller_func inlines this func. */
char *caller_file;
/* Source location file name. */
char *file;
/* Source location line number where caller_func inlines this func. */
int caller_line;
/* Source location line number. */
int line;
int tag;
bfd_boolean is_linkage;
const char *name;
struct arange arange;
/* Where the symbol is defined. */
asection *sec;
};
struct varinfo
{
/* Pointer to previous variable in list of all variables */
struct varinfo *prev_var;
/* Source location file name */
char *file;
/* Source location line number */
int line;
int tag;
char *name;
bfd_vma addr;
/* Where the symbol is defined */
asection *sec;
/* Is this a stack variable? */
unsigned int stack: 1;
};
/* Return TRUE if NEW_LINE should sort after LINE. */
static inline bfd_boolean
new_line_sorts_after (struct line_info *new_line, struct line_info *line)
{
return (new_line->address > line->address
|| (new_line->address == line->address
&& (new_line->op_index > line->op_index
|| (new_line->op_index == line->op_index
&& new_line->end_sequence < line->end_sequence))));
}
/* Adds a new entry to the line_info list in the line_info_table, ensuring
that the list is sorted. Note that the line_info list is sorted from
highest to lowest VMA (with possible duplicates); that is,
line_info->prev_line always accesses an equal or smaller VMA. */
static bfd_boolean
add_line_info (struct line_info_table *table,
bfd_vma address,
unsigned char op_index,
char *filename,
unsigned int line,
unsigned int column,
unsigned int discriminator,
int end_sequence)
{
bfd_size_type amt = sizeof (struct line_info);
struct line_sequence* seq = table->sequences;
struct line_info* info = (struct line_info *) bfd_alloc (table->abfd, amt);
if (info == NULL)
return FALSE;
/* Set member data of 'info'. */
info->prev_line = NULL;
info->address = address;
info->op_index = op_index;
info->line = line;
info->column = column;
info->discriminator = discriminator;
info->end_sequence = end_sequence;
if (filename && filename[0])
{
info->filename = (char *) bfd_alloc (table->abfd, strlen (filename) + 1);
if (info->filename == NULL)
return FALSE;
strcpy (info->filename, filename);
}
else
info->filename = NULL;
/* Find the correct location for 'info'. Normally we will receive
new line_info data 1) in order and 2) with increasing VMAs.
However some compilers break the rules (cf. decode_line_info) and
so we include some heuristics for quickly finding the correct
location for 'info'. In particular, these heuristics optimize for
the common case in which the VMA sequence that we receive is a
list of locally sorted VMAs such as
p...z a...j (where a < j < p < z)
Note: table->lcl_head is used to head an *actual* or *possible*
sub-sequence within the list (such as a...j) that is not directly
headed by table->last_line
Note: we may receive duplicate entries from 'decode_line_info'. */
if (seq
&& seq->last_line->address == address
&& seq->last_line->op_index == op_index
&& seq->last_line->end_sequence == end_sequence)
{
/* We only keep the last entry with the same address and end
sequence. See PR ld/4986. */
if (table->lcl_head == seq->last_line)
table->lcl_head = info;
info->prev_line = seq->last_line->prev_line;
seq->last_line = info;
}
else if (!seq || seq->last_line->end_sequence)
{
/* Start a new line sequence. */
amt = sizeof (struct line_sequence);
seq = (struct line_sequence *) bfd_malloc (amt);
if (seq == NULL)
return FALSE;
seq->low_pc = address;
seq->prev_sequence = table->sequences;
seq->last_line = info;
table->lcl_head = info;
table->sequences = seq;
table->num_sequences++;
}
else if (new_line_sorts_after (info, seq->last_line))
{
/* Normal case: add 'info' to the beginning of the current sequence. */
info->prev_line = seq->last_line;
seq->last_line = info;
/* lcl_head: initialize to head a *possible* sequence at the end. */
if (!table->lcl_head)
table->lcl_head = info;
}
else if (!new_line_sorts_after (info, table->lcl_head)
&& (!table->lcl_head->prev_line
|| new_line_sorts_after (info, table->lcl_head->prev_line)))
{
/* Abnormal but easy: lcl_head is the head of 'info'. */
info->prev_line = table->lcl_head->prev_line;
table->lcl_head->prev_line = info;
}
else
{
/* Abnormal and hard: Neither 'last_line' nor 'lcl_head'
are valid heads for 'info'. Reset 'lcl_head'. */
struct line_info* li2 = seq->last_line; /* Always non-NULL. */
struct line_info* li1 = li2->prev_line;
while (li1)
{
if (!new_line_sorts_after (info, li2)
&& new_line_sorts_after (info, li1))
break;
li2 = li1; /* always non-NULL */
li1 = li1->prev_line;
}
table->lcl_head = li2;
info->prev_line = table->lcl_head->prev_line;
table->lcl_head->prev_line = info;
if (address < seq->low_pc)
seq->low_pc = address;
}
return TRUE;
}
/* Extract a fully qualified filename from a line info table.
The returned string has been malloc'ed and it is the caller's
responsibility to free it. */
static char *
concat_filename (struct line_info_table *table, unsigned int file)
{
char *filename;
if (file - 1 >= table->num_files)
{
/* FILE == 0 means unknown. */
if (file)
(*_bfd_error_handler)
(_("Dwarf Error: mangled line number section (bad file number)."));
return strdup ("<unknown>");
}
filename = table->files[file - 1].name;
if (!IS_ABSOLUTE_PATH (filename))
{
char *dir_name = NULL;
char *subdir_name = NULL;
char *name;
size_t len;
if (table->files[file - 1].dir
/* PR 17512: file: 0317e960. */
&& table->files[file - 1].dir <= table->num_dirs
/* PR 17512: file: 7f3d2e4b. */
&& table->dirs != NULL)
subdir_name = table->dirs[table->files[file - 1].dir - 1];
if (!subdir_name || !IS_ABSOLUTE_PATH (subdir_name))
dir_name = table->comp_dir;
if (!dir_name)
{
dir_name = subdir_name;
subdir_name = NULL;
}
if (!dir_name)
return strdup (filename);
len = strlen (dir_name) + strlen (filename) + 2;
if (subdir_name)
{
len += strlen (subdir_name) + 1;
name = (char *) bfd_malloc (len);
if (name)
sprintf (name, "%s/%s/%s", dir_name, subdir_name, filename);
}
else
{
name = (char *) bfd_malloc (len);
if (name)
sprintf (name, "%s/%s", dir_name, filename);
}
return name;
}
return strdup (filename);
}
static bfd_boolean
arange_add (const struct comp_unit *unit, struct arange *first_arange,
bfd_vma low_pc, bfd_vma high_pc)
{
struct arange *arange;
/* Ignore empty ranges. */
if (low_pc == high_pc)
return TRUE;
/* If the first arange is empty, use it. */
if (first_arange->high == 0)
{
first_arange->low = low_pc;
first_arange->high = high_pc;
return TRUE;
}
/* Next see if we can cheaply extend an existing range. */
arange = first_arange;
do
{
if (low_pc == arange->high)
{
arange->high = high_pc;
return TRUE;
}
if (high_pc == arange->low)
{
arange->low = low_pc;
return TRUE;
}
arange = arange->next;
}
while (arange);
/* Need to allocate a new arange and insert it into the arange list.
Order isn't significant, so just insert after the first arange. */
arange = (struct arange *) bfd_alloc (unit->abfd, sizeof (*arange));
if (arange == NULL)
return FALSE;
arange->low = low_pc;
arange->high = high_pc;
arange->next = first_arange->next;
first_arange->next = arange;
return TRUE;
}
/* Compare function for line sequences. */
static int
compare_sequences (const void* a, const void* b)
{
const struct line_sequence* seq1 = a;
const struct line_sequence* seq2 = b;
/* Sort by low_pc as the primary key. */
if (seq1->low_pc < seq2->low_pc)
return -1;
if (seq1->low_pc > seq2->low_pc)
return 1;
/* If low_pc values are equal, sort in reverse order of
high_pc, so that the largest region comes first. */
if (seq1->last_line->address < seq2->last_line->address)
return 1;
if (seq1->last_line->address > seq2->last_line->address)
return -1;
if (seq1->last_line->op_index < seq2->last_line->op_index)
return 1;
if (seq1->last_line->op_index > seq2->last_line->op_index)
return -1;
return 0;
}
/* Sort the line sequences for quick lookup. */
static bfd_boolean
sort_line_sequences (struct line_info_table* table)
{
bfd_size_type amt;
struct line_sequence* sequences;
struct line_sequence* seq;
unsigned int n = 0;
unsigned int num_sequences = table->num_sequences;
bfd_vma last_high_pc;
if (num_sequences == 0)
return TRUE;
/* Allocate space for an array of sequences. */
amt = sizeof (struct line_sequence) * num_sequences;
sequences = (struct line_sequence *) bfd_alloc (table->abfd, amt);
if (sequences == NULL)
return FALSE;
/* Copy the linked list into the array, freeing the original nodes. */
seq = table->sequences;
for (n = 0; n < num_sequences; n++)
{
struct line_sequence* last_seq = seq;
BFD_ASSERT (seq);
sequences[n].low_pc = seq->low_pc;
sequences[n].prev_sequence = NULL;
sequences[n].last_line = seq->last_line;
seq = seq->prev_sequence;
free (last_seq);
}
BFD_ASSERT (seq == NULL);
qsort (sequences, n, sizeof (struct line_sequence), compare_sequences);
/* Make the list binary-searchable by trimming overlapping entries
and removing nested entries. */
num_sequences = 1;
last_high_pc = sequences[0].last_line->address;
for (n = 1; n < table->num_sequences; n++)
{
if (sequences[n].low_pc < last_high_pc)
{
if (sequences[n].last_line->address <= last_high_pc)
/* Skip nested entries. */
continue;
/* Trim overlapping entries. */
sequences[n].low_pc = last_high_pc;
}
last_high_pc = sequences[n].last_line->address;
if (n > num_sequences)
{
/* Close up the gap. */
sequences[num_sequences].low_pc = sequences[n].low_pc;
sequences[num_sequences].last_line = sequences[n].last_line;
}
num_sequences++;
}
table->sequences = sequences;
table->num_sequences = num_sequences;
return TRUE;
}
/* Decode the line number information for UNIT. */
static struct line_info_table*
decode_line_info (struct comp_unit *unit, struct dwarf2_debug *stash)
{
bfd *abfd = unit->abfd;
struct line_info_table* table;
bfd_byte *line_ptr;
bfd_byte *line_end;
struct line_head lh;
unsigned int i, bytes_read, offset_size;
char *cur_file, *cur_dir;
unsigned char op_code, extended_op, adj_opcode;
unsigned int exop_len;
bfd_size_type amt;
if (! read_section (abfd, &stash->debug_sections[debug_line],
stash->syms, unit->line_offset,
&stash->dwarf_line_buffer, &stash->dwarf_line_size))
return NULL;
amt = sizeof (struct line_info_table);
table = (struct line_info_table *) bfd_alloc (abfd, amt);
if (table == NULL)
return NULL;
table->abfd = abfd;
table->comp_dir = unit->comp_dir;
table->num_files = 0;
table->files = NULL;
table->num_dirs = 0;
table->dirs = NULL;
table->num_sequences = 0;
table->sequences = NULL;
table->lcl_head = NULL;
if (stash->dwarf_line_size < 16)
{
(*_bfd_error_handler)
(_("Dwarf Error: Line info section is too small (%ld)"),
(long) stash->dwarf_line_size);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
line_ptr = stash->dwarf_line_buffer + unit->line_offset;
line_end = stash->dwarf_line_buffer + stash->dwarf_line_size;
/* Read in the prologue. */
lh.total_length = read_4_bytes (abfd, line_ptr, line_end);
line_ptr += 4;
offset_size = 4;
if (lh.total_length == 0xffffffff)
{
lh.total_length = read_8_bytes (abfd, line_ptr, line_end);
line_ptr += 8;
offset_size = 8;
}
else if (lh.total_length == 0 && unit->addr_size == 8)
{
/* Handle (non-standard) 64-bit DWARF2 formats. */
lh.total_length = read_4_bytes (abfd, line_ptr, line_end);
line_ptr += 4;
offset_size = 8;
}
if (lh.total_length > stash->dwarf_line_size)
{
(*_bfd_error_handler)
(_("Dwarf Error: Line info data is bigger (0x%lx) than the section (0x%lx)"),
(long) lh.total_length, (long) stash->dwarf_line_size);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
line_end = line_ptr + lh.total_length;
lh.version = read_2_bytes (abfd, line_ptr, line_end);
if (lh.version < 2 || lh.version > 4)
{
(*_bfd_error_handler)
(_("Dwarf Error: Unhandled .debug_line version %d."), lh.version);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
line_ptr += 2;
if (line_ptr + offset_size + (lh.version >=4 ? 6 : 5) >= line_end)
{
(*_bfd_error_handler)
(_("Dwarf Error: Ran out of room reading prologue"));
bfd_set_error (bfd_error_bad_value);
return NULL;
}
if (offset_size == 4)
lh.prologue_length = read_4_bytes (abfd, line_ptr, line_end);
else
lh.prologue_length = read_8_bytes (abfd, line_ptr, line_end);
line_ptr += offset_size;
lh.minimum_instruction_length = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
if (lh.version >= 4)
{
lh.maximum_ops_per_insn = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
}
else
lh.maximum_ops_per_insn = 1;
if (lh.maximum_ops_per_insn == 0)
{
(*_bfd_error_handler)
(_("Dwarf Error: Invalid maximum operations per instruction."));
bfd_set_error (bfd_error_bad_value);
return NULL;
}
lh.default_is_stmt = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
lh.line_base = read_1_signed_byte (abfd, line_ptr, line_end);
line_ptr += 1;
lh.line_range = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
lh.opcode_base = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
if (line_ptr + (lh.opcode_base - 1) >= line_end)
{
(*_bfd_error_handler) (_("Dwarf Error: Ran out of room reading opcodes"));
bfd_set_error (bfd_error_bad_value);
return NULL;
}
amt = lh.opcode_base * sizeof (unsigned char);
lh.standard_opcode_lengths = (unsigned char *) bfd_alloc (abfd, amt);
lh.standard_opcode_lengths[0] = 1;
for (i = 1; i < lh.opcode_base; ++i)
{
lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
}
/* Read directory table. */
while ((cur_dir = read_string (abfd, line_ptr, line_end, &bytes_read)) != NULL)
{
line_ptr += bytes_read;
if ((table->num_dirs % DIR_ALLOC_CHUNK) == 0)
{
char **tmp;
amt = table->num_dirs + DIR_ALLOC_CHUNK;
amt *= sizeof (char *);
tmp = (char **) bfd_realloc (table->dirs, amt);
if (tmp == NULL)
goto fail;
table->dirs = tmp;
}
table->dirs[table->num_dirs++] = cur_dir;
}
line_ptr += bytes_read;
/* Read file name table. */
while ((cur_file = read_string (abfd, line_ptr, line_end, &bytes_read)) != NULL)
{
line_ptr += bytes_read;
if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
{
struct fileinfo *tmp;
amt = table->num_files + FILE_ALLOC_CHUNK;
amt *= sizeof (struct fileinfo);
tmp = (struct fileinfo *) bfd_realloc (table->files, amt);
if (tmp == NULL)
goto fail;
table->files = tmp;
}
table->files[table->num_files].name = cur_file;
table->files[table->num_files].dir =
safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
table->files[table->num_files].time = safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
table->files[table->num_files].size = safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
table->num_files++;
}
line_ptr += bytes_read;
/* Read the statement sequences until there's nothing left. */
while (line_ptr < line_end)
{
/* State machine registers. */
bfd_vma address = 0;
unsigned char op_index = 0;
char * filename = table->num_files ? concat_filename (table, 1) : NULL;
unsigned int line = 1;
unsigned int column = 0;
unsigned int discriminator = 0;
int is_stmt = lh.default_is_stmt;
int end_sequence = 0;
/* eraxxon@alumni.rice.edu: Against the DWARF2 specs, some
compilers generate address sequences that are wildly out of
order using DW_LNE_set_address (e.g. Intel C++ 6.0 compiler
for ia64-Linux). Thus, to determine the low and high
address, we must compare on every DW_LNS_copy, etc. */
bfd_vma low_pc = (bfd_vma) -1;
bfd_vma high_pc = 0;
/* Decode the table. */
while (! end_sequence)
{
op_code = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
if (op_code >= lh.opcode_base)
{
/* Special operand. */
adj_opcode = op_code - lh.opcode_base;
if (lh.line_range == 0)
goto line_fail;
if (lh.maximum_ops_per_insn == 1)
address += (adj_opcode / lh.line_range
* lh.minimum_instruction_length);
else
{
address += ((op_index + adj_opcode / lh.line_range)
/ lh.maximum_ops_per_insn
* lh.minimum_instruction_length);
op_index = ((op_index + adj_opcode / lh.line_range)
% lh.maximum_ops_per_insn);
}
line += lh.line_base + (adj_opcode % lh.line_range);
/* Append row to matrix using current values. */
if (!add_line_info (table, address, op_index, filename,
line, column, discriminator, 0))
goto line_fail;
discriminator = 0;
if (address < low_pc)
low_pc = address;
if (address > high_pc)
high_pc = address;
}
else switch (op_code)
{
case DW_LNS_extended_op:
exop_len = safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
extended_op = read_1_byte (abfd, line_ptr, line_end);
line_ptr += 1;
switch (extended_op)
{
case DW_LNE_end_sequence:
end_sequence = 1;
if (!add_line_info (table, address, op_index, filename, line,
column, discriminator, end_sequence))
goto line_fail;
discriminator = 0;
if (address < low_pc)
low_pc = address;
if (address > high_pc)
high_pc = address;
if (!arange_add (unit, &unit->arange, low_pc, high_pc))
goto line_fail;
break;
case DW_LNE_set_address:
address = read_address (unit, line_ptr, line_end);
op_index = 0;
line_ptr += unit->addr_size;
break;
case DW_LNE_define_file:
cur_file = read_string (abfd, line_ptr, line_end, &bytes_read);
line_ptr += bytes_read;
if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
{
struct fileinfo *tmp;
amt = table->num_files + FILE_ALLOC_CHUNK;
amt *= sizeof (struct fileinfo);
tmp = (struct fileinfo *) bfd_realloc (table->files, amt);
if (tmp == NULL)
goto line_fail;
table->files = tmp;
}
table->files[table->num_files].name = cur_file;
table->files[table->num_files].dir =
safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
table->files[table->num_files].time =
safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
table->files[table->num_files].size =
safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
table->num_files++;
break;
case DW_LNE_set_discriminator:
discriminator =
safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
break;
case DW_LNE_HP_source_file_correlation:
line_ptr += exop_len - 1;
break;
default:
(*_bfd_error_handler)
(_("Dwarf Error: mangled line number section."));
bfd_set_error (bfd_error_bad_value);
line_fail:
if (filename != NULL)
free (filename);
goto fail;
}
break;
case DW_LNS_copy:
if (!add_line_info (table, address, op_index,
filename, line, column, discriminator, 0))
goto line_fail;
discriminator = 0;
if (address < low_pc)
low_pc = address;
if (address > high_pc)
high_pc = address;
break;
case DW_LNS_advance_pc:
if (lh.maximum_ops_per_insn == 1)
address += (lh.minimum_instruction_length
* safe_read_leb128 (abfd, line_ptr, &bytes_read,
FALSE, line_end));
else
{
bfd_vma adjust = safe_read_leb128 (abfd, line_ptr, &bytes_read,
FALSE, line_end);
address = ((op_index + adjust) / lh.maximum_ops_per_insn
* lh.minimum_instruction_length);
op_index = (op_index + adjust) % lh.maximum_ops_per_insn;
}
line_ptr += bytes_read;
break;
case DW_LNS_advance_line:
line += safe_read_leb128 (abfd, line_ptr, &bytes_read, TRUE, line_end);
line_ptr += bytes_read;
break;
case DW_LNS_set_file:
{
unsigned int file;
/* The file and directory tables are 0
based, the references are 1 based. */
file = safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
if (filename)
free (filename);
filename = concat_filename (table, file);
break;
}
case DW_LNS_set_column:
column = safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
break;
case DW_LNS_negate_stmt:
is_stmt = (!is_stmt);
break;
case DW_LNS_set_basic_block:
break;
case DW_LNS_const_add_pc:
if (lh.maximum_ops_per_insn == 1)
address += (lh.minimum_instruction_length
* ((255 - lh.opcode_base) / lh.line_range));
else
{
bfd_vma adjust = ((255 - lh.opcode_base) / lh.line_range);
address += (lh.minimum_instruction_length
* ((op_index + adjust)
/ lh.maximum_ops_per_insn));
op_index = (op_index + adjust) % lh.maximum_ops_per_insn;
}
break;
case DW_LNS_fixed_advance_pc:
address += read_2_bytes (abfd, line_ptr, line_end);
op_index = 0;
line_ptr += 2;
break;
default:
/* Unknown standard opcode, ignore it. */
for (i = 0; i < lh.standard_opcode_lengths[op_code]; i++)
{
(void) safe_read_leb128 (abfd, line_ptr, &bytes_read, FALSE, line_end);
line_ptr += bytes_read;
}
break;
}
}
if (filename)
free (filename);
}
if (sort_line_sequences (table))
return table;
fail:
if (table->sequences != NULL)
free (table->sequences);
if (table->files != NULL)
free (table->files);
if (table->dirs != NULL)
free (table->dirs);
return NULL;
}
/* If ADDR is within TABLE set the output parameters and return the
range of addresses covered by the entry used to fill them out.
Otherwise set * FILENAME_PTR to NULL and return 0.
The parameters FILENAME_PTR, LINENUMBER_PTR and DISCRIMINATOR_PTR
are pointers to the objects to be filled in. */
static bfd_vma
lookup_address_in_line_info_table (struct line_info_table *table,
bfd_vma addr,
const char **filename_ptr,
unsigned int *linenumber_ptr,
unsigned int *discriminator_ptr)
{
struct line_sequence *seq = NULL;
struct line_info *each_line;
int low, high, mid;
/* Binary search the array of sequences. */
low = 0;
high = table->num_sequences;
while (low < high)
{
mid = (low + high) / 2;
seq = &table->sequences[mid];
if (addr < seq->low_pc)
high = mid;
else if (addr >= seq->last_line->address)
low = mid + 1;
else
break;
}
if (seq && addr >= seq->low_pc && addr < seq->last_line->address)
{
/* Note: seq->last_line should be a descendingly sorted list. */
for (each_line = seq->last_line;
each_line;
each_line = each_line->prev_line)
if (addr >= each_line->address)
break;
if (each_line
&& !(each_line->end_sequence || each_line == seq->last_line))
{
*filename_ptr = each_line->filename;
*linenumber_ptr = each_line->line;
if (discriminator_ptr)
*discriminator_ptr = each_line->discriminator;
return seq->last_line->address - seq->low_pc;
}
}
*filename_ptr = NULL;
return 0;
}
/* Read in the .debug_ranges section for future reference. */
static bfd_boolean
read_debug_ranges (struct comp_unit *unit)
{
struct dwarf2_debug *stash = unit->stash;
return read_section (unit->abfd, &stash->debug_sections[debug_ranges],
stash->syms, 0,
&stash->dwarf_ranges_buffer, &stash->dwarf_ranges_size);
}
/* Function table functions. */
/* If ADDR is within UNIT's function tables, set FUNCTION_PTR, and return
TRUE. Note that we need to find the function that has the smallest range
that contains ADDR, to handle inlined functions without depending upon
them being ordered in TABLE by increasing range. */
static bfd_boolean
lookup_address_in_function_table (struct comp_unit *unit,
bfd_vma addr,
struct funcinfo **function_ptr)
{
struct funcinfo* each_func;
struct funcinfo* best_fit = NULL;
bfd_vma best_fit_len = 0;
struct arange *arange;
for (each_func = unit->function_table;
each_func;
each_func = each_func->prev_func)
{
for (arange = &each_func->arange;
arange;
arange = arange->next)
{
if (addr >= arange->low && addr < arange->high)
{
if (!best_fit
|| arange->high - arange->low < best_fit_len)
{
best_fit = each_func;
best_fit_len = arange->high - arange->low;
}
}
}
}
if (best_fit)
{
*function_ptr = best_fit;
return TRUE;
}
return FALSE;
}
/* If SYM at ADDR is within function table of UNIT, set FILENAME_PTR
and LINENUMBER_PTR, and return TRUE. */
static bfd_boolean
lookup_symbol_in_function_table (struct comp_unit *unit,
asymbol *sym,
bfd_vma addr,
const char **filename_ptr,
unsigned int *linenumber_ptr)
{
struct funcinfo* each_func;
struct funcinfo* best_fit = NULL;
bfd_vma best_fit_len = 0;
struct arange *arange;
const char *name = bfd_asymbol_name (sym);
asection *sec = bfd_get_section (sym);
for (each_func = unit->function_table;
each_func;
each_func = each_func->prev_func)
{
for (arange = &each_func->arange;
arange;
arange = arange->next)
{
if ((!each_func->sec || each_func->sec == sec)
&& addr >= arange->low
&& addr < arange->high
&& each_func->name
&& strcmp (name, each_func->name) == 0
&& (!best_fit
|| arange->high - arange->low < best_fit_len))
{
best_fit = each_func;
best_fit_len = arange->high - arange->low;
}
}
}
if (best_fit)
{
best_fit->sec = sec;
*filename_ptr = best_fit->file;
*linenumber_ptr = best_fit->line;
return TRUE;
}
else
return FALSE;
}
/* Variable table functions. */
/* If SYM is within variable table of UNIT, set FILENAME_PTR and
LINENUMBER_PTR, and return TRUE. */
static bfd_boolean
lookup_symbol_in_variable_table (struct comp_unit *unit,
asymbol *sym,
bfd_vma addr,
const char **filename_ptr,
unsigned int *linenumber_ptr)
{
const char *name = bfd_asymbol_name (sym);
asection *sec = bfd_get_section (sym);
struct varinfo* each;
for (each = unit->variable_table; each; each = each->prev_var)
if (each->stack == 0
&& each->file != NULL
&& each->name != NULL
&& each->addr == addr
&& (!each->sec || each->sec == sec)
&& strcmp (name, each->name) == 0)
break;
if (each)
{
each->sec = sec;
*filename_ptr = each->file;
*linenumber_ptr = each->line;
return TRUE;
}
else
return FALSE;
}
static char *
find_abstract_instance_name (struct comp_unit *unit,
struct attribute *attr_ptr,
bfd_boolean *is_linkage)
{
bfd *abfd = unit->abfd;
bfd_byte *info_ptr;
bfd_byte *info_ptr_end;
unsigned int abbrev_number, bytes_read, i;
struct abbrev_info *abbrev;
bfd_uint64_t die_ref = attr_ptr->u.val;
struct attribute attr;
char *name = NULL;
/* DW_FORM_ref_addr can reference an entry in a different CU. It
is an offset from the .debug_info section, not the current CU. */
if (attr_ptr->form == DW_FORM_ref_addr)
{
/* We only support DW_FORM_ref_addr within the same file, so
any relocations should be resolved already. */
if (!die_ref)
abort ();
info_ptr = unit->sec_info_ptr + die_ref;
info_ptr_end = unit->end_ptr;
/* Now find the CU containing this pointer. */
if (info_ptr >= unit->info_ptr_unit && info_ptr < unit->end_ptr)
;
else
{
/* Check other CUs to see if they contain the abbrev. */
struct comp_unit * u;
for (u = unit->prev_unit; u != NULL; u = u->prev_unit)
if (info_ptr >= u->info_ptr_unit && info_ptr < u->end_ptr)
break;
if (u == NULL)
for (u = unit->next_unit; u != NULL; u = u->next_unit)
if (info_ptr >= u->info_ptr_unit && info_ptr < u->end_ptr)
break;
if (u)
unit = u;
/* else FIXME: What do we do now ? */
}
}
else if (attr_ptr->form == DW_FORM_GNU_ref_alt)
{
info_ptr = read_alt_indirect_ref (unit, die_ref);
if (info_ptr == NULL)
{
(*_bfd_error_handler)
(_("Dwarf Error: Unable to read alt ref %u."), die_ref);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
info_ptr_end = unit->stash->alt_dwarf_info_buffer + unit->stash->alt_dwarf_info_size;
/* FIXME: Do we need to locate the correct CU, in a similar
fashion to the code in the DW_FORM_ref_addr case above ? */
}
else
{
info_ptr = unit->info_ptr_unit + die_ref;
info_ptr_end = unit->end_ptr;
}
abbrev_number = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
info_ptr += bytes_read;
if (abbrev_number)
{
abbrev = lookup_abbrev (abbrev_number, unit->abbrevs);
if (! abbrev)
{
(*_bfd_error_handler)
(_("Dwarf Error: Could not find abbrev number %u."), abbrev_number);
bfd_set_error (bfd_error_bad_value);
}
else
{
for (i = 0; i < abbrev->num_attrs; ++i)
{
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit,
info_ptr, info_ptr_end);
if (info_ptr == NULL)
break;
switch (attr.name)
{
case DW_AT_name:
/* Prefer DW_AT_MIPS_linkage_name or DW_AT_linkage_name
over DW_AT_name. */
if (name == NULL && is_str_attr (attr.form))
{
name = attr.u.str;
if (non_mangled (unit->lang))
*is_linkage = TRUE;
}
break;
case DW_AT_specification:
name = find_abstract_instance_name (unit, &attr, is_linkage);
break;
case DW_AT_linkage_name:
case DW_AT_MIPS_linkage_name:
/* PR 16949: Corrupt debug info can place
non-string forms into these attributes. */
if (is_str_attr (attr.form))
{
name = attr.u.str;
*is_linkage = TRUE;
}
break;
default:
break;
}
}
}
}
return name;
}
static bfd_boolean
read_rangelist (struct comp_unit *unit, struct arange *arange,
bfd_uint64_t offset)
{
bfd_byte *ranges_ptr;
bfd_byte *ranges_end;
bfd_vma base_address = unit->base_address;
if (! unit->stash->dwarf_ranges_buffer)
{
if (! read_debug_ranges (unit))
return FALSE;
}
ranges_ptr = unit->stash->dwarf_ranges_buffer + offset;
if (ranges_ptr < unit->stash->dwarf_ranges_buffer)
return FALSE;
ranges_end = unit->stash->dwarf_ranges_buffer + unit->stash->dwarf_ranges_size;
for (;;)
{
bfd_vma low_pc;
bfd_vma high_pc;
/* PR 17512: file: 62cada7d. */
if (ranges_ptr + 2 * unit->addr_size > ranges_end)
return FALSE;
low_pc = read_address (unit, ranges_ptr, ranges_end);
ranges_ptr += unit->addr_size;
high_pc = read_address (unit, ranges_ptr, ranges_end);
ranges_ptr += unit->addr_size;
if (low_pc == 0 && high_pc == 0)
break;
if (low_pc == -1UL && high_pc != -1UL)
base_address = high_pc;
else
{
if (!arange_add (unit, arange,
base_address + low_pc, base_address + high_pc))
return FALSE;
}
}
return TRUE;
}
/* DWARF2 Compilation unit functions. */
/* Scan over each die in a comp. unit looking for functions to add
to the function table and variables to the variable table. */
static bfd_boolean
scan_unit_for_symbols (struct comp_unit *unit)
{
bfd *abfd = unit->abfd;
bfd_byte *info_ptr = unit->first_child_die_ptr;
bfd_byte *info_ptr_end = unit->stash->info_ptr_end;
int nesting_level = 1;
struct funcinfo **nested_funcs;
int nested_funcs_size;
/* Maintain a stack of in-scope functions and inlined functions, which we
can use to set the caller_func field. */
nested_funcs_size = 32;
nested_funcs = (struct funcinfo **)
bfd_malloc (nested_funcs_size * sizeof (struct funcinfo *));
if (nested_funcs == NULL)
return FALSE;
nested_funcs[nesting_level] = 0;
while (nesting_level)
{
unsigned int abbrev_number, bytes_read, i;
struct abbrev_info *abbrev;
struct attribute attr;
struct funcinfo *func;
struct varinfo *var;
bfd_vma low_pc = 0;
bfd_vma high_pc = 0;
bfd_boolean high_pc_relative = FALSE;
/* PR 17512: file: 9f405d9d. */
if (info_ptr >= info_ptr_end)
goto fail;
abbrev_number = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
info_ptr += bytes_read;
if (! abbrev_number)
{
nesting_level--;
continue;
}
abbrev = lookup_abbrev (abbrev_number,unit->abbrevs);
if (! abbrev)
{
(*_bfd_error_handler)
(_("Dwarf Error: Could not find abbrev number %u."),
abbrev_number);
bfd_set_error (bfd_error_bad_value);
goto fail;
}
var = NULL;
if (abbrev->tag == DW_TAG_subprogram
|| abbrev->tag == DW_TAG_entry_point
|| abbrev->tag == DW_TAG_inlined_subroutine)
{
bfd_size_type amt = sizeof (struct funcinfo);
func = (struct funcinfo *) bfd_zalloc (abfd, amt);
if (func == NULL)
goto fail;
func->tag = abbrev->tag;
func->prev_func = unit->function_table;
unit->function_table = func;
BFD_ASSERT (!unit->cached);
if (func->tag == DW_TAG_inlined_subroutine)
for (i = nesting_level - 1; i >= 1; i--)
if (nested_funcs[i])
{
func->caller_func = nested_funcs[i];
break;
}
nested_funcs[nesting_level] = func;
}
else
{
func = NULL;
if (abbrev->tag == DW_TAG_variable)
{
bfd_size_type amt = sizeof (struct varinfo);
var = (struct varinfo *) bfd_zalloc (abfd, amt);
if (var == NULL)
goto fail;
var->tag = abbrev->tag;
var->stack = 1;
var->prev_var = unit->variable_table;
unit->variable_table = var;
BFD_ASSERT (!unit->cached);
}
/* No inline function in scope at this nesting level. */
nested_funcs[nesting_level] = 0;
}
for (i = 0; i < abbrev->num_attrs; ++i)
{
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, info_ptr, info_ptr_end);
if (info_ptr == NULL)
goto fail;
if (func)
{
switch (attr.name)
{
case DW_AT_call_file:
func->caller_file = concat_filename (unit->line_table,
attr.u.val);
break;
case DW_AT_call_line:
func->caller_line = attr.u.val;
break;
case DW_AT_abstract_origin:
case DW_AT_specification:
func->name = find_abstract_instance_name (unit, &attr,
&func->is_linkage);
break;
case DW_AT_name:
/* Prefer DW_AT_MIPS_linkage_name or DW_AT_linkage_name
over DW_AT_name. */
if (func->name == NULL && is_str_attr (attr.form))
{
func->name = attr.u.str;
if (non_mangled (unit->lang))
func->is_linkage = TRUE;
}
break;
case DW_AT_linkage_name:
case DW_AT_MIPS_linkage_name:
/* PR 16949: Corrupt debug info can place
non-string forms into these attributes. */
if (is_str_attr (attr.form))
{
func->name = attr.u.str;
func->is_linkage = TRUE;
}
break;
case DW_AT_low_pc:
low_pc = attr.u.val;
break;
case DW_AT_high_pc:
high_pc = attr.u.val;
high_pc_relative = attr.form != DW_FORM_addr;
break;
case DW_AT_ranges:
if (!read_rangelist (unit, &func->arange, attr.u.val))
goto fail;
break;
case DW_AT_decl_file:
func->file = concat_filename (unit->line_table,
attr.u.val);
break;
case DW_AT_decl_line:
func->line = attr.u.val;
break;
default:
break;
}
}
else if (var)
{
switch (attr.name)
{
case DW_AT_name:
var->name = attr.u.str;
break;
case DW_AT_decl_file:
var->file = concat_filename (unit->line_table,
attr.u.val);
break;
case DW_AT_decl_line:
var->line = attr.u.val;
break;
case DW_AT_external:
if (attr.u.val != 0)
var->stack = 0;
break;
case DW_AT_location:
switch (attr.form)
{
case DW_FORM_block:
case DW_FORM_block1:
case DW_FORM_block2:
case DW_FORM_block4:
case DW_FORM_exprloc:
if (*attr.u.blk->data == DW_OP_addr)
{
var->stack = 0;
/* Verify that DW_OP_addr is the only opcode in the
location, in which case the block size will be 1
plus the address size. */
/* ??? For TLS variables, gcc can emit
DW_OP_addr <addr> DW_OP_GNU_push_tls_address
which we don't handle here yet. */
if (attr.u.blk->size == unit->addr_size + 1U)
var->addr = bfd_get (unit->addr_size * 8,
unit->abfd,
attr.u.blk->data + 1);
}
break;
default:
break;
}
break;
default:
break;
}
}
}
if (high_pc_relative)
high_pc += low_pc;
if (func && high_pc != 0)
{
if (!arange_add (unit, &func->arange, low_pc, high_pc))
goto fail;
}
if (abbrev->has_children)
{
nesting_level++;
if (nesting_level >= nested_funcs_size)
{
struct funcinfo **tmp;
nested_funcs_size *= 2;
tmp = (struct funcinfo **)
bfd_realloc (nested_funcs,
nested_funcs_size * sizeof (struct funcinfo *));
if (tmp == NULL)
goto fail;
nested_funcs = tmp;
}
nested_funcs[nesting_level] = 0;
}
}
free (nested_funcs);
return TRUE;
fail:
free (nested_funcs);
return FALSE;
}
/* Parse a DWARF2 compilation unit starting at INFO_PTR. This
includes the compilation unit header that proceeds the DIE's, but
does not include the length field that precedes each compilation
unit header. END_PTR points one past the end of this comp unit.
OFFSET_SIZE is the size of DWARF2 offsets (either 4 or 8 bytes).
This routine does not read the whole compilation unit; only enough
to get to the line number information for the compilation unit. */
static struct comp_unit *
parse_comp_unit (struct dwarf2_debug *stash,
bfd_vma unit_length,
bfd_byte *info_ptr_unit,
unsigned int offset_size)
{
struct comp_unit* unit;
unsigned int version;
bfd_uint64_t abbrev_offset = 0;
unsigned int addr_size;
struct abbrev_info** abbrevs;
unsigned int abbrev_number, bytes_read, i;
struct abbrev_info *abbrev;
struct attribute attr;
bfd_byte *info_ptr = stash->info_ptr;
bfd_byte *end_ptr = info_ptr + unit_length;
bfd_size_type amt;
bfd_vma low_pc = 0;
bfd_vma high_pc = 0;
bfd *abfd = stash->bfd_ptr;
bfd_boolean high_pc_relative = FALSE;
version = read_2_bytes (abfd, info_ptr, end_ptr);
info_ptr += 2;
BFD_ASSERT (offset_size == 4 || offset_size == 8);
if (offset_size == 4)
abbrev_offset = read_4_bytes (abfd, info_ptr, end_ptr);
else
abbrev_offset = read_8_bytes (abfd, info_ptr, end_ptr);
info_ptr += offset_size;
addr_size = read_1_byte (abfd, info_ptr, end_ptr);
info_ptr += 1;
if (version != 2 && version != 3 && version != 4)
{
/* PR 19872: A version number of 0 probably means that there is padding
at the end of the .debug_info section. Gold puts it there when
performing an incremental link, for example. So do not generate
an error, just return a NULL. */
if (version)
{
(*_bfd_error_handler)
(_("Dwarf Error: found dwarf version '%u', this reader"
" only handles version 2, 3 and 4 information."), version);
bfd_set_error (bfd_error_bad_value);
}
return NULL;
}
if (addr_size > sizeof (bfd_vma))
{
(*_bfd_error_handler)
(_("Dwarf Error: found address size '%u', this reader"
" can not handle sizes greater than '%u'."),
addr_size,
(unsigned int) sizeof (bfd_vma));
bfd_set_error (bfd_error_bad_value);
return NULL;
}
if (addr_size != 2 && addr_size != 4 && addr_size != 8)
{
(*_bfd_error_handler)
("Dwarf Error: found address size '%u', this reader"
" can only handle address sizes '2', '4' and '8'.", addr_size);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
/* Read the abbrevs for this compilation unit into a table. */
abbrevs = read_abbrevs (abfd, abbrev_offset, stash);
if (! abbrevs)
return NULL;
abbrev_number = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, end_ptr);
info_ptr += bytes_read;
if (! abbrev_number)
{
/* PR 19872: An abbrev number of 0 probably means that there is padding
at the end of the .debug_abbrev section. Gold puts it there when
performing an incremental link, for example. So do not generate
an error, just return a NULL. */
return NULL;
}
abbrev = lookup_abbrev (abbrev_number, abbrevs);
if (! abbrev)
{
(*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %u."),
abbrev_number);