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/* Symbol table lookup for the GNU debugger, GDB.
Copyright (C) 1986-2016 Free Software Foundation, Inc.
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/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcore.h"
#include "frame.h"
#include "target.h"
#include "value.h"
#include "symfile.h"
#include "objfiles.h"
#include "gdbcmd.h"
#include "gdb_regex.h"
#include "expression.h"
#include "language.h"
#include "demangle.h"
#include "inferior.h"
#include "source.h"
#include "filenames.h" /* for FILENAME_CMP */
#include "objc-lang.h"
#include "d-lang.h"
#include "ada-lang.h"
#include "go-lang.h"
#include "p-lang.h"
#include "addrmap.h"
#include "cli/cli-utils.h"
#include "fnmatch.h"
#include "hashtab.h"
#include "gdb_obstack.h"
#include "block.h"
#include "dictionary.h"
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#include "cp-abi.h"
#include "cp-support.h"
#include "observer.h"
#include "solist.h"
#include "macrotab.h"
#include "macroscope.h"
#include "parser-defs.h"
#include "completer.h"
/* Forward declarations for local functions. */
static void rbreak_command (char *, int);
static int find_line_common (struct linetable *, int, int *, int);
static struct block_symbol
lookup_symbol_aux (const char *name,
const struct block *block,
const domain_enum domain,
enum language language,
struct field_of_this_result *);
static
struct block_symbol lookup_local_symbol (const char *name,
const struct block *block,
const domain_enum domain,
enum language language);
static struct block_symbol
lookup_symbol_in_objfile (struct objfile *objfile, int block_index,
const char *name, const domain_enum domain);
/* See symtab.h. */
const struct block_symbol null_block_symbol = { NULL, NULL };
extern initialize_file_ftype _initialize_symtab;
/* Program space key for finding name and language of "main". */
static const struct program_space_data *main_progspace_key;
/* Type of the data stored on the program space. */
struct main_info
{
/* Name of "main". */
char *name_of_main;
/* Language of "main". */
enum language language_of_main;
};
/* Program space key for finding its symbol cache. */
static const struct program_space_data *symbol_cache_key;
/* The default symbol cache size.
There is no extra cpu cost for large N (except when flushing the cache,
which is rare). The value here is just a first attempt. A better default
value may be higher or lower. A prime number can make up for a bad hash
computation, so that's why the number is what it is. */
#define DEFAULT_SYMBOL_CACHE_SIZE 1021
/* The maximum symbol cache size.
There's no method to the decision of what value to use here, other than
there's no point in allowing a user typo to make gdb consume all memory. */
#define MAX_SYMBOL_CACHE_SIZE (1024*1024)
/* symbol_cache_lookup returns this if a previous lookup failed to find the
symbol in any objfile. */
#define SYMBOL_LOOKUP_FAILED \
((struct block_symbol) {(struct symbol *) 1, NULL})
#define SYMBOL_LOOKUP_FAILED_P(SIB) (SIB.symbol == (struct symbol *) 1)
/* Recording lookups that don't find the symbol is just as important, if not
more so, than recording found symbols. */
enum symbol_cache_slot_state
{
SYMBOL_SLOT_UNUSED,
SYMBOL_SLOT_NOT_FOUND,
SYMBOL_SLOT_FOUND
};
struct symbol_cache_slot
{
enum symbol_cache_slot_state state;
/* The objfile that was current when the symbol was looked up.
This is only needed for global blocks, but for simplicity's sake
we allocate the space for both. If data shows the extra space used
for static blocks is a problem, we can split things up then.
Global blocks need cache lookup to include the objfile context because
we need to account for gdbarch_iterate_over_objfiles_in_search_order
which can traverse objfiles in, effectively, any order, depending on
the current objfile, thus affecting which symbol is found. Normally,
only the current objfile is searched first, and then the rest are
searched in recorded order; but putting cache lookup inside
gdbarch_iterate_over_objfiles_in_search_order would be awkward.
Instead we just make the current objfile part of the context of
cache lookup. This means we can record the same symbol multiple times,
each with a different "current objfile" that was in effect when the
lookup was saved in the cache, but cache space is pretty cheap. */
const struct objfile *objfile_context;
union
{
struct block_symbol found;
struct
{
char *name;
domain_enum domain;
} not_found;
} value;
};
/* Symbols don't specify global vs static block.
So keep them in separate caches. */
struct block_symbol_cache
{
unsigned int hits;
unsigned int misses;
unsigned int collisions;
/* SYMBOLS is a variable length array of this size.
One can imagine that in general one cache (global/static) should be a
fraction of the size of the other, but there's no data at the moment
on which to decide. */
unsigned int size;
struct symbol_cache_slot symbols[1];
};
/* The symbol cache.
Searching for symbols in the static and global blocks over multiple objfiles
again and again can be slow, as can searching very big objfiles. This is a
simple cache to improve symbol lookup performance, which is critical to
overall gdb performance.
Symbols are hashed on the name, its domain, and block.
They are also hashed on their objfile for objfile-specific lookups. */
struct symbol_cache
{
struct block_symbol_cache *global_symbols;
struct block_symbol_cache *static_symbols;
};
/* When non-zero, print debugging messages related to symtab creation. */
unsigned int symtab_create_debug = 0;
/* When non-zero, print debugging messages related to symbol lookup. */
unsigned int symbol_lookup_debug = 0;
/* The size of the cache is staged here. */
static unsigned int new_symbol_cache_size = DEFAULT_SYMBOL_CACHE_SIZE;
/* The current value of the symbol cache size.
This is saved so that if the user enters a value too big we can restore
the original value from here. */
static unsigned int symbol_cache_size = DEFAULT_SYMBOL_CACHE_SIZE;
/* Non-zero if a file may be known by two different basenames.
This is the uncommon case, and significantly slows down gdb.
Default set to "off" to not slow down the common case. */
int basenames_may_differ = 0;
/* Allow the user to configure the debugger behavior with respect
to multiple-choice menus when more than one symbol matches during
a symbol lookup. */
const char multiple_symbols_ask[] = "ask";
const char multiple_symbols_all[] = "all";
const char multiple_symbols_cancel[] = "cancel";
static const char *const multiple_symbols_modes[] =
{
multiple_symbols_ask,
multiple_symbols_all,
multiple_symbols_cancel,
NULL
};
static const char *multiple_symbols_mode = multiple_symbols_all;
/* Read-only accessor to AUTO_SELECT_MODE. */
const char *
multiple_symbols_select_mode (void)
{
return multiple_symbols_mode;
}
/* Return the name of a domain_enum. */
const char *
domain_name (domain_enum e)
{
switch (e)
{
case UNDEF_DOMAIN: return "UNDEF_DOMAIN";
case VAR_DOMAIN: return "VAR_DOMAIN";
case STRUCT_DOMAIN: return "STRUCT_DOMAIN";
case MODULE_DOMAIN: return "MODULE_DOMAIN";
case LABEL_DOMAIN: return "LABEL_DOMAIN";
case COMMON_BLOCK_DOMAIN: return "COMMON_BLOCK_DOMAIN";
default: gdb_assert_not_reached ("bad domain_enum");
}
}
/* Return the name of a search_domain . */
const char *
search_domain_name (enum search_domain e)
{
switch (e)
{
case VARIABLES_DOMAIN: return "VARIABLES_DOMAIN";
case FUNCTIONS_DOMAIN: return "FUNCTIONS_DOMAIN";
case TYPES_DOMAIN: return "TYPES_DOMAIN";
case ALL_DOMAIN: return "ALL_DOMAIN";
default: gdb_assert_not_reached ("bad search_domain");
}
}
/* See symtab.h. */
struct symtab *
compunit_primary_filetab (const struct compunit_symtab *cust)
{
gdb_assert (COMPUNIT_FILETABS (cust) != NULL);
/* The primary file symtab is the first one in the list. */
return COMPUNIT_FILETABS (cust);
}
/* See symtab.h. */
enum language
compunit_language (const struct compunit_symtab *cust)
{
struct symtab *symtab = compunit_primary_filetab (cust);
/* The language of the compunit symtab is the language of its primary
source file. */
return SYMTAB_LANGUAGE (symtab);
}
/* See whether FILENAME matches SEARCH_NAME using the rule that we
advertise to the user. (The manual's description of linespecs
describes what we advertise). Returns true if they match, false
otherwise. */
int
compare_filenames_for_search (const char *filename, const char *search_name)
{
int len = strlen (filename);
size_t search_len = strlen (search_name);
if (len < search_len)
return 0;
/* The tail of FILENAME must match. */
if (FILENAME_CMP (filename + len - search_len, search_name) != 0)
return 0;
/* Either the names must completely match, or the character
preceding the trailing SEARCH_NAME segment of FILENAME must be a
directory separator.
The check !IS_ABSOLUTE_PATH ensures SEARCH_NAME "/dir/file.c"
cannot match FILENAME "/path//dir/file.c" - as user has requested
absolute path. The sama applies for "c:\file.c" possibly
incorrectly hypothetically matching "d:\dir\c:\file.c".
The HAS_DRIVE_SPEC purpose is to make FILENAME "c:file.c"
compatible with SEARCH_NAME "file.c". In such case a compiler had
to put the "c:file.c" name into debug info. Such compatibility
works only on GDB built for DOS host. */
return (len == search_len
|| (!IS_ABSOLUTE_PATH (search_name)
&& IS_DIR_SEPARATOR (filename[len - search_len - 1]))
|| (HAS_DRIVE_SPEC (filename)
&& STRIP_DRIVE_SPEC (filename) == &filename[len - search_len]));
}
/* Same as compare_filenames_for_search, but for glob-style patterns.
Heads up on the order of the arguments. They match the order of
compare_filenames_for_search, but it's the opposite of the order of
arguments to gdb_filename_fnmatch. */
int
compare_glob_filenames_for_search (const char *filename,
const char *search_name)
{
/* We rely on the property of glob-style patterns with FNM_FILE_NAME that
all /s have to be explicitly specified. */
int file_path_elements = count_path_elements (filename);
int search_path_elements = count_path_elements (search_name);
if (search_path_elements > file_path_elements)
return 0;
if (IS_ABSOLUTE_PATH (search_name))
{
return (search_path_elements == file_path_elements
&& gdb_filename_fnmatch (search_name, filename,
FNM_FILE_NAME | FNM_NOESCAPE) == 0);
}
{
const char *file_to_compare
= strip_leading_path_elements (filename,
file_path_elements - search_path_elements);
return gdb_filename_fnmatch (search_name, file_to_compare,
FNM_FILE_NAME | FNM_NOESCAPE) == 0;
}
}
/* Check for a symtab of a specific name by searching some symtabs.
This is a helper function for callbacks of iterate_over_symtabs.
If NAME is not absolute, then REAL_PATH is NULL
If NAME is absolute, then REAL_PATH is the gdb_realpath form of NAME.
The return value, NAME, REAL_PATH, CALLBACK, and DATA
are identical to the `map_symtabs_matching_filename' method of
quick_symbol_functions.
FIRST and AFTER_LAST indicate the range of compunit symtabs to search.
Each symtab within the specified compunit symtab is also searched.
AFTER_LAST is one past the last compunit symtab to search; NULL means to
search until the end of the list. */
int
iterate_over_some_symtabs (const char *name,
const char *real_path,
int (*callback) (struct symtab *symtab,
void *data),
void *data,
struct compunit_symtab *first,
struct compunit_symtab *after_last)
{
struct compunit_symtab *cust;
struct symtab *s;
const char* base_name = lbasename (name);
for (cust = first; cust != NULL && cust != after_last; cust = cust->next)
{
ALL_COMPUNIT_FILETABS (cust, s)
{
if (compare_filenames_for_search (s->filename, name))
{
if (callback (s, 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 (base_name, lbasename (s->filename)) != 0)
continue;
if (compare_filenames_for_search (symtab_to_fullname (s), name))
{
if (callback (s, data))
return 1;
continue;
}
/* If the user gave us an absolute path, try to find the file in
this symtab and use its absolute path. */
if (real_path != NULL)
{
const char *fullname = symtab_to_fullname (s);
gdb_assert (IS_ABSOLUTE_PATH (real_path));
gdb_assert (IS_ABSOLUTE_PATH (name));
if (FILENAME_CMP (real_path, fullname) == 0)
{
if (callback (s, data))
return 1;
continue;
}
}
}
}
return 0;
}
/* Check for a symtab of a specific name; first in symtabs, then in
psymtabs. *If* there is no '/' in the name, a match after a '/'
in the symtab filename will also work.
Calls CALLBACK with each symtab that is found and with the supplied
DATA. If CALLBACK returns true, the search stops. */
void
iterate_over_symtabs (const char *name,
int (*callback) (struct symtab *symtab,
void *data),
void *data)
{
struct objfile *objfile;
char *real_path = NULL;
struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
/* Here we are interested in canonicalizing an absolute path, not
absolutizing a relative path. */
if (IS_ABSOLUTE_PATH (name))
{
real_path = gdb_realpath (name);
make_cleanup (xfree, real_path);
gdb_assert (IS_ABSOLUTE_PATH (real_path));
}
ALL_OBJFILES (objfile)
{
if (iterate_over_some_symtabs (name, real_path, callback, data,
objfile->compunit_symtabs, NULL))
{
do_cleanups (cleanups);
return;
}
}
/* Same search rules as above apply here, but now we look thru the
psymtabs. */
ALL_OBJFILES (objfile)
{
if (objfile->sf
&& objfile->sf->qf->map_symtabs_matching_filename (objfile,
name,
real_path,
callback,
data))
{
do_cleanups (cleanups);
return;
}
}
do_cleanups (cleanups);
}
/* The callback function used by lookup_symtab. */
static int
lookup_symtab_callback (struct symtab *symtab, void *data)
{
struct symtab **result_ptr = (struct symtab **) data;
*result_ptr = symtab;
return 1;
}
/* A wrapper for iterate_over_symtabs that returns the first matching
symtab, or NULL. */
struct symtab *
lookup_symtab (const char *name)
{
struct symtab *result = NULL;
iterate_over_symtabs (name, lookup_symtab_callback, &result);
return result;
}
/* Mangle a GDB method stub type. This actually reassembles the pieces of the
full method name, which consist of the class name (from T), the unadorned
method name from METHOD_ID, and the signature for the specific overload,
specified by SIGNATURE_ID. Note that this function is g++ specific. */
char *
gdb_mangle_name (struct type *type, int method_id, int signature_id)
{
int mangled_name_len;
char *mangled_name;
struct fn_field *f = TYPE_FN_FIELDLIST1 (type, method_id);
struct fn_field *method = &f[signature_id];
const char *field_name = TYPE_FN_FIELDLIST_NAME (type, method_id);
const char *physname = TYPE_FN_FIELD_PHYSNAME (f, signature_id);
const char *newname = type_name_no_tag (type);
/* Does the form of physname indicate that it is the full mangled name
of a constructor (not just the args)? */
int is_full_physname_constructor;
int is_constructor;
int is_destructor = is_destructor_name (physname);
/* Need a new type prefix. */
const char *const_prefix = method->is_const ? "C" : "";
const char *volatile_prefix = method->is_volatile ? "V" : "";
char buf[20];
int len = (newname == NULL ? 0 : strlen (newname));
/* Nothing to do if physname already contains a fully mangled v3 abi name
or an operator name. */
if ((physname[0] == '_' && physname[1] == 'Z')
|| is_operator_name (field_name))
return xstrdup (physname);
is_full_physname_constructor = is_constructor_name (physname);
is_constructor = is_full_physname_constructor
|| (newname && strcmp (field_name, newname) == 0);
if (!is_destructor)
is_destructor = (startswith (physname, "__dt"));
if (is_destructor || is_full_physname_constructor)
{
mangled_name = (char *) xmalloc (strlen (physname) + 1);
strcpy (mangled_name, physname);
return mangled_name;
}
if (len == 0)
{
xsnprintf (buf, sizeof (buf), "__%s%s", const_prefix, volatile_prefix);
}
else if (physname[0] == 't' || physname[0] == 'Q')
{
/* The physname for template and qualified methods already includes
the class name. */
xsnprintf (buf, sizeof (buf), "__%s%s", const_prefix, volatile_prefix);
newname = NULL;
len = 0;
}
else
{
xsnprintf (buf, sizeof (buf), "__%s%s%d", const_prefix,
volatile_prefix, len);
}
mangled_name_len = ((is_constructor ? 0 : strlen (field_name))
+ strlen (buf) + len + strlen (physname) + 1);
mangled_name = (char *) xmalloc (mangled_name_len);
if (is_constructor)
mangled_name[0] = '\0';
else
strcpy (mangled_name, field_name);
strcat (mangled_name, buf);
/* If the class doesn't have a name, i.e. newname NULL, then we just
mangle it using 0 for the length of the class. Thus it gets mangled
as something starting with `::' rather than `classname::'. */
if (newname != NULL)
strcat (mangled_name, newname);
strcat (mangled_name, physname);
return (mangled_name);
}
/* Set the demangled name of GSYMBOL to NAME. NAME must be already
correctly allocated. */
void
symbol_set_demangled_name (struct general_symbol_info *gsymbol,
const char *name,
struct obstack *obstack)
{
if (gsymbol->language == language_ada)
{
if (name == NULL)
{
gsymbol->ada_mangled = 0;
gsymbol->language_specific.obstack = obstack;
}
else
{
gsymbol->ada_mangled = 1;
gsymbol->language_specific.demangled_name = name;
}
}
else
gsymbol->language_specific.demangled_name = name;
}
/* Return the demangled name of GSYMBOL. */
const char *
symbol_get_demangled_name (const struct general_symbol_info *gsymbol)
{
if (gsymbol->language == language_ada)
{
if (!gsymbol->ada_mangled)
return NULL;
/* Fall through. */
}
return gsymbol->language_specific.demangled_name;
}
/* Initialize the language dependent portion of a symbol
depending upon the language for the symbol. */
void
symbol_set_language (struct general_symbol_info *gsymbol,
enum language language,
struct obstack *obstack)
{
gsymbol->language = language;
if (gsymbol->language == language_cplus
|| gsymbol->language == language_d
|| gsymbol->language == language_go
|| gsymbol->language == language_java
|| gsymbol->language == language_objc
|| gsymbol->language == language_fortran)
{
symbol_set_demangled_name (gsymbol, NULL, obstack);
}
else if (gsymbol->language == language_ada)
{
gdb_assert (gsymbol->ada_mangled == 0);
gsymbol->language_specific.obstack = obstack;
}
else
{
memset (&gsymbol->language_specific, 0,
sizeof (gsymbol->language_specific));
}
}
/* Functions to initialize a symbol's mangled name. */
/* Objects of this type are stored in the demangled name hash table. */
struct demangled_name_entry
{
const char *mangled;
char demangled[1];
};
/* Hash function for the demangled name hash. */
static hashval_t
hash_demangled_name_entry (const void *data)
{
const struct demangled_name_entry *e
= (const struct demangled_name_entry *) data;
return htab_hash_string (e->mangled);
}
/* Equality function for the demangled name hash. */
static int
eq_demangled_name_entry (const void *a, const void *b)
{
const struct demangled_name_entry *da
= (const struct demangled_name_entry *) a;
const struct demangled_name_entry *db
= (const struct demangled_name_entry *) b;
return strcmp (da->mangled, db->mangled) == 0;
}
/* Create the hash table used for demangled names. Each hash entry is
a pair of strings; one for the mangled name and one for the demangled
name. The entry is hashed via just the mangled name. */
static void
create_demangled_names_hash (struct objfile *objfile)
{
/* Choose 256 as the starting size of the hash table, somewhat arbitrarily.
The hash table code will round this up to the next prime number.
Choosing a much larger table size wastes memory, and saves only about
1% in symbol reading. */
objfile->per_bfd->demangled_names_hash = htab_create_alloc
(256, hash_demangled_name_entry, eq_demangled_name_entry,
NULL, xcalloc, xfree);
}
/* Try to determine the demangled name for a symbol, based on the
language of that symbol. If the language is set to language_auto,
it will attempt to find any demangling algorithm that works and
then set the language appropriately. The returned name is allocated
by the demangler and should be xfree'd. */
static char *
symbol_find_demangled_name (struct general_symbol_info *gsymbol,
const char *mangled)
{
char *demangled = NULL;
int i;
int recognized;
if (gsymbol->language == language_unknown)
gsymbol->language = language_auto;
if (gsymbol->language != language_auto)
{
const struct language_defn *lang = language_def (gsymbol->language);
language_sniff_from_mangled_name (lang, mangled, &demangled);
return demangled;
}
for (i = language_unknown; i < nr_languages; ++i)
{
enum language l = (enum language) i;
const struct language_defn *lang = language_def (l);
if (language_sniff_from_mangled_name (lang, mangled, &demangled))
{
gsymbol->language = l;
return demangled;
}
}
return NULL;
}
/* Set both the mangled and demangled (if any) names for GSYMBOL based
on LINKAGE_NAME and LEN. Ordinarily, NAME is copied onto the
objfile's obstack; but if COPY_NAME is 0 and if NAME is
NUL-terminated, then this function assumes that NAME is already
correctly saved (either permanently or with a lifetime tied to the
objfile), and it will not be copied.
The hash table corresponding to OBJFILE is used, and the memory
comes from the per-BFD storage_obstack. LINKAGE_NAME is copied,
so the pointer can be discarded after calling this function. */
/* We have to be careful when dealing with Java names: when we run
into a Java minimal symbol, we don't know it's a Java symbol, so it
gets demangled as a C++ name. This is unfortunate, but there's not
much we can do about it: but when demangling partial symbols and
regular symbols, we'd better not reuse the wrong demangled name.
(See PR gdb/1039.) We solve this by putting a distinctive prefix
on Java names when storing them in the hash table. */
/* FIXME: carlton/2003-03-13: This is an unfortunate situation. I
don't mind the Java prefix so much: different languages have
different demangling requirements, so it's only natural that we
need to keep language data around in our demangling cache. But
it's not good that the minimal symbol has the wrong demangled name.
Unfortunately, I can't think of any easy solution to that
problem. */
#define JAVA_PREFIX "##JAVA$$"
#define JAVA_PREFIX_LEN 8
void
symbol_set_names (struct general_symbol_info *gsymbol,
const char *linkage_name, int len, int copy_name,
struct objfile *objfile)
{
struct demangled_name_entry **slot;
/* A 0-terminated copy of the linkage name. */
const char *linkage_name_copy;
/* A copy of the linkage name that might have a special Java prefix
added to it, for use when looking names up in the hash table. */
const char *lookup_name;
/* The length of lookup_name. */
int lookup_len;
struct demangled_name_entry entry;
struct objfile_per_bfd_storage *per_bfd = objfile->per_bfd;
if (gsymbol->language == language_ada)
{
/* In Ada, we do the symbol lookups using the mangled name, so
we can save some space by not storing the demangled name.
As a side note, we have also observed some overlap between
the C++ mangling and Ada mangling, similarly to what has
been observed with Java. Because we don't store the demangled
name with the symbol, we don't need to use the same trick
as Java. */
if (!copy_name)
gsymbol->name = linkage_name;
else
{
char *name = (char *) obstack_alloc (&per_bfd->storage_obstack,
len + 1);
memcpy (name, linkage_name, len);
name[len] = '\0';
gsymbol->name = name;
}
symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
return;
}
if (per_bfd->demangled_names_hash == NULL)
create_demangled_names_hash (objfile);
/* The stabs reader generally provides names that are not
NUL-terminated; most of the other readers don't do this, so we
can just use the given copy, unless we're in the Java case. */
if (gsymbol->language == language_java)
{
char *alloc_name;
lookup_len = len + JAVA_PREFIX_LEN;
alloc_name = (char *) alloca (lookup_len + 1);
memcpy (alloc_name, JAVA_PREFIX, JAVA_PREFIX_LEN);
memcpy (alloc_name + JAVA_PREFIX_LEN, linkage_name, len);
alloc_name[lookup_len] = '\0';
lookup_name = alloc_name;
linkage_name_copy = alloc_name + JAVA_PREFIX_LEN;
}
else if (linkage_name[len] != '\0')
{
char *alloc_name;
lookup_len = len;
alloc_name = (char *) alloca (lookup_len + 1);
memcpy (alloc_name, linkage_name, len);
alloc_name[lookup_len] = '\0';
lookup_name = alloc_name;
linkage_name_copy = alloc_name;
}
else
{
lookup_len = len;
lookup_name = linkage_name;
linkage_name_copy = linkage_name;
}
entry.mangled = lookup_name;
slot = ((struct demangled_name_entry **)
htab_find_slot (per_bfd->demangled_names_hash,
&entry, INSERT));
/* If this name is not in the hash table, add it. */
if (*slot == NULL
/* A C version of the symbol may have already snuck into the table.
This happens to, e.g., main.init (__go_init_main). Cope. */
|| (gsymbol->language == language_go
&& (*slot)->demangled[0] == '\0'))
{
char *demangled_name = symbol_find_demangled_name (gsymbol,
linkage_name_copy);
int demangled_len = demangled_name ? strlen (demangled_name) : 0;
/* Suppose we have demangled_name==NULL, copy_name==0, and
lookup_name==linkage_name. In this case, we already have the
mangled name saved, and we don't have a demangled name. So,
you might think we could save a little space by not recording
this in the hash table at all.
It turns out that it is actually important to still save such
an entry in the hash table, because storing this name gives
us better bcache hit rates for partial symbols. */
if (!copy_name && lookup_name == linkage_name)
{
*slot
= ((struct demangled_name_entry *)
obstack_alloc (&per_bfd->storage_obstack,
offsetof (struct demangled_name_entry, demangled)
+ demangled_len + 1));
(*slot)->mangled = lookup_name;
}
else
{
char *mangled_ptr;
/* If we must copy the mangled name, put it directly after
the demangled name so we can have a single
allocation. */
*slot
= ((struct demangled_name_entry *)
obstack_alloc (&per_bfd->storage_obstack,
offsetof (struct demangled_name_entry, demangled)
+ lookup_len + demangled_len + 2));
mangled_ptr = &((*slot)->demangled[demangled_len + 1]);
strcpy (mangled_ptr, lookup_name);
(*slot)->mangled = mangled_ptr;
}
if (demangled_name != NULL)
{
strcpy ((*slot)->demangled, demangled_name);
xfree (demangled_name);
}
else
(*slot)->demangled[0] = '\0';
}
gsymbol->name = (*slot)->mangled + lookup_len - len;
if ((*slot)->demangled[0] != '\0')
symbol_set_demangled_name (gsymbol, (*slot)->demangled,
&per_bfd->storage_obstack);
else
symbol_set_demangled_name (gsymbol, NULL, &per_bfd->storage_obstack);
}
/* Return the source code name of a symbol. In languages where
demangling is necessary, this is the demangled name. */
const char *
symbol_natural_name (const struct general_symbol_info *gsymbol)
{
switch (gsymbol->language)
{
case language_cplus:
case language_d:
case language_go:
case language_java:
case language_objc:
case language_fortran:
if (symbol_get_demangled_name (gsymbol) != NULL)
return symbol_get_demangled_name (gsymbol);
break;
case language_ada:
return ada_decode_symbol (gsymbol);
default:
break;
}
return gsymbol->name;
}
/* Return the demangled name for a symbol based on the language for
that symbol. If no demangled name exists, return NULL. */
const char *
symbol_demangled_name (const struct general_symbol_info *gsymbol)
{
const char *dem_name = NULL;
switch (gsymbol->language)
{
case language_cplus:
case language_d:
case language_go:
case language_java:
case language_objc:
case language_fortran:
dem_name = symbol_get_demangled_name (gsymbol);
break;
case language_ada:
dem_name = ada_decode_symbol (gsymbol);
break;
default:
break;
}
return dem_name;
}
/* Return the search name of a symbol---generally the demangled or
linkage name of the symbol, depending on how it will be searched for.
If there is no distinct demangled name, then returns the same value
(same pointer) as SYMBOL_LINKAGE_NAME. */
const char *
symbol_search_name (const struct general_symbol_info *gsymbol)
{
if (gsymbol->language == language_ada)
return gsymbol->name;
else
return symbol_natural_name (gsymbol);
}
/* Initialize the structure fields to zero values. */
void
init_sal (struct symtab_and_line *sal)
{
memset (sal, 0, sizeof (*sal));
}
/* Return 1 if the two sections are the same, or if they could
plausibly be copies of each other, one in an original object
file and another in a separated debug file. */
int
matching_obj_sections (struct obj_section *obj_first,
struct obj_section *obj_second)
{
asection *first = obj_first? obj_first->the_bfd_section : NULL;
asection *second = obj_second? obj_second->the_bfd_section : NULL;
struct objfile *obj;
/* If they're the same section, then they match. */
if (first == second)
return 1;
/* If either is NULL, give up. */
if (first == NULL || second == NULL)
return 0;
/* This doesn't apply to absolute symbols. */
if (first->owner == NULL || second->owner == NULL)
return 0;
/* If they're in the same object file, they must be different sections. */
if (first->owner == second->owner)
return 0;
/* Check whether the two sections are potentially corresponding. They must
have the same size, address, and name. We can't compare section indexes,
which would be more reliable, because some sections may have been
stripped. */
if (bfd_get_section_size (first) != bfd_get_section_size (second))
return 0;
/* In-memory addresses may start at a different offset, relativize them. */
if (bfd_get_section_vma (first->owner, first)
- bfd_get_start_address (first->owner)
!= bfd_get_section_vma (second->owner, second)
- bfd_get_start_address (second->owner))
return 0;
if (bfd_get_section_name (first->owner, first) == NULL
|| bfd_get_section_name (second->owner, second) == NULL
|| strcmp (bfd_get_section_name (first->owner, first),
bfd_get_section_name (second->owner, second)) != 0)
return 0;
/* Otherwise check that they are in corresponding objfiles. */
ALL_OBJFILES (obj)
if (obj->obfd == first->owner)
break;
gdb_assert (obj != NULL);
if (obj->separate_debug_objfile != NULL
&& obj->separate_debug_objfile->obfd == second->owner)
return 1;
if (obj->separate_debug_objfile_backlink != NULL
&& obj->separate_debug_objfile_backlink->obfd == second->owner)
return 1;
return 0;
}
/* See symtab.h. */
void
expand_symtab_containing_pc (CORE_ADDR pc, struct obj_section *section)
{
struct objfile *objfile;
struct bound_minimal_symbol msymbol;
/* If we know that this is not a text address, return failure. This is
necessary because we loop based on texthigh and textlow, which do
not include the data ranges. */
msymbol = lookup_minimal_symbol_by_pc_section (pc, section);
if (msymbol.minsym
&& (MSYMBOL_TYPE (msymbol.minsym) == mst_data
|| MSYMBOL_TYPE (msymbol.minsym) == mst_bss
|| MSYMBOL_TYPE (msymbol.minsym) == mst_abs
|| MSYMBOL_TYPE (msymbol.minsym) == mst_file_data
|| MSYMBOL_TYPE (msymbol.minsym) == mst_file_bss))
return;
ALL_OBJFILES (objfile)
{
struct compunit_symtab *cust = NULL;
if (objfile->sf)
cust = objfile->sf->qf->find_pc_sect_compunit_symtab (objfile, msymbol,
pc, section, 0);
if (cust)
return;
}
}
/* Hash function for the symbol cache. */
static unsigned int
hash_symbol_entry (const struct objfile *objfile_context,
const char *name, domain_enum domain)
{
unsigned int hash = (uintptr_t) objfile_context;
if (name != NULL)
hash += htab_hash_string (name);
/* Because of symbol_matches_domain we need VAR_DOMAIN and STRUCT_DOMAIN
to map to the same slot. */
if (domain == STRUCT_DOMAIN)
hash += VAR_DOMAIN * 7;
else
hash += domain * 7;
return hash;
}
/* Equality function for the symbol cache. */
static int
eq_symbol_entry (const struct symbol_cache_slot *slot,
const struct objfile *objfile_context,
const char *name, domain_enum domain)
{
const char *slot_name;
domain_enum slot_domain;
if (slot->state == SYMBOL_SLOT_UNUSED)
return 0;
if (slot->objfile_context != objfile_context)
return 0;
if (slot->state == SYMBOL_SLOT_NOT_FOUND)
{
slot_name = slot->value.not_found.name;
slot_domain = slot->value.not_found.domain;
}
else
{
slot_name = SYMBOL_SEARCH_NAME (slot->value.found.symbol);
slot_domain = SYMBOL_DOMAIN (slot->value.found.symbol);
}
/* NULL names match. */
if (slot_name == NULL && name == NULL)
{
/* But there's no point in calling symbol_matches_domain in the
SYMBOL_SLOT_FOUND case. */
if (slot_domain != domain)
return 0;
}
else if (slot_name != NULL && name != NULL)
{
/* It's important that we use the same comparison that was done the
first time through. If the slot records a found symbol, then this
means using strcmp_iw on SYMBOL_SEARCH_NAME. See dictionary.c.
It also means using symbol_matches_domain for found symbols.
See block.c.
If the slot records a not-found symbol, then require a precise match.
We could still be lax with whitespace like strcmp_iw though. */
if (slot->state == SYMBOL_SLOT_NOT_FOUND)
{
if (strcmp (slot_name, name) != 0)
return 0;
if (slot_domain != domain)
return 0;
}
else
{
struct symbol *sym = slot->value.found.symbol;
if (strcmp_iw (slot_name, name) != 0)
return 0;
if (!symbol_matches_domain (SYMBOL_LANGUAGE (sym),
slot_domain, domain))
return 0;
}
}
else
{
/* Only one name is NULL. */
return 0;
}
return 1;
}
/* Given a cache of size SIZE, return the size of the struct (with variable
length array) in bytes. */
static size_t
symbol_cache_byte_size (unsigned int size)
{
return (sizeof (struct block_symbol_cache)
+ ((size - 1) * sizeof (struct symbol_cache_slot)));
}
/* Resize CACHE. */
static void
resize_symbol_cache (struct symbol_cache *cache, unsigned int new_size)
{
/* If there's no change in size, don't do anything.
All caches have the same size, so we can just compare with the size
of the global symbols cache. */
if ((cache->global_symbols != NULL
&& cache->global_symbols->size == new_size)
|| (cache->global_symbols == NULL
&& new_size == 0))
return;
xfree (cache->global_symbols);
xfree (cache->static_symbols);
if (new_size == 0)
{
cache->global_symbols = NULL;
cache->static_symbols = NULL;
}
else
{
size_t total_size = symbol_cache_byte_size (new_size);
cache->global_symbols
= (struct block_symbol_cache *) xcalloc (1, total_size);
cache->static_symbols
= (struct block_symbol_cache *) xcalloc (1, total_size);
cache->global_symbols->size = new_size;
cache->static_symbols->size = new_size;
}
}
/* Make a symbol cache of size SIZE. */
static struct symbol_cache *
make_symbol_cache (unsigned int size)
{
struct symbol_cache *cache;
cache = XCNEW (struct symbol_cache);
resize_symbol_cache (cache, symbol_cache_size);
return cache;
}
/* Free the space used by CACHE. */
static void
free_symbol_cache (struct symbol_cache *cache)
{
xfree (cache->global_symbols);
xfree (cache->static_symbols);
xfree (cache);
}
/* Return the symbol cache of PSPACE.
Create one if it doesn't exist yet. */
static struct symbol_cache *
get_symbol_cache (struct program_space *pspace)
{
struct symbol_cache *cache
= (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
if (cache == NULL)
{
cache = make_symbol_cache (symbol_cache_size);
set_program_space_data (pspace, symbol_cache_key, cache);
}
return cache;
}
/* Delete the symbol cache of PSPACE.
Called when PSPACE is destroyed. */
static void
symbol_cache_cleanup (struct program_space *pspace, void *data)
{
struct symbol_cache *cache = (struct symbol_cache *) data;
free_symbol_cache (cache);
}
/* Set the size of the symbol cache in all program spaces. */
static void
set_symbol_cache_size (unsigned int new_size)
{
struct program_space *pspace;
ALL_PSPACES (pspace)
{
struct symbol_cache *cache
= (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
/* The pspace could have been created but not have a cache yet. */
if (cache != NULL)
resize_symbol_cache (cache, new_size);
}
}
/* Called when symbol-cache-size is set. */
static void
set_symbol_cache_size_handler (char *args, int from_tty,
struct cmd_list_element *c)
{
if (new_symbol_cache_size > MAX_SYMBOL_CACHE_SIZE)
{
/* Restore the previous value.
This is the value the "show" command prints. */
new_symbol_cache_size = symbol_cache_size;
error (_("Symbol cache size is too large, max is %u."),
MAX_SYMBOL_CACHE_SIZE);
}
symbol_cache_size = new_symbol_cache_size;
set_symbol_cache_size (symbol_cache_size);
}
/* Lookup symbol NAME,DOMAIN in BLOCK in the symbol cache of PSPACE.
OBJFILE_CONTEXT is the current objfile, which may be NULL.
The result is the symbol if found, SYMBOL_LOOKUP_FAILED if a previous lookup
failed (and thus this one will too), or NULL if the symbol is not present
in the cache.
If the symbol is not present in the cache, then *BSC_PTR and *SLOT_PTR are
set to the cache and slot of the symbol to save the result of a full lookup
attempt. */
static struct block_symbol
symbol_cache_lookup (struct symbol_cache *cache,
struct objfile *objfile_context, int block,
const char *name, domain_enum domain,
struct block_symbol_cache **bsc_ptr,
struct symbol_cache_slot **slot_ptr)
{
struct block_symbol_cache *bsc;
unsigned int hash;
struct symbol_cache_slot *slot;
if (block == GLOBAL_BLOCK)
bsc = cache->global_symbols;
else
bsc = cache->static_symbols;
if (bsc == NULL)
{
*bsc_ptr = NULL;
*slot_ptr = NULL;
return (struct block_symbol) {NULL, NULL};
}
hash = hash_symbol_entry (objfile_context, name, domain);
slot = bsc->symbols + hash % bsc->size;
if (eq_symbol_entry (slot, objfile_context, name, domain))
{
if (symbol_lookup_debug)
fprintf_unfiltered (gdb_stdlog,
"%s block symbol cache hit%s for %s, %s\n",
block == GLOBAL_BLOCK ? "Global" : "Static",
slot->state == SYMBOL_SLOT_NOT_FOUND
? " (not found)" : "",
name, domain_name (domain));
++bsc->hits;
if (slot->state == SYMBOL_SLOT_NOT_FOUND)
return SYMBOL_LOOKUP_FAILED;
return slot->value.found;
}
/* Symbol is not present in the cache. */
*bsc_ptr = bsc;
*slot_ptr = slot;
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
"%s block symbol cache miss for %s, %s\n",
block == GLOBAL_BLOCK ? "Global" : "Static",
name, domain_name (domain));
}
++bsc->misses;
return (struct block_symbol) {NULL, NULL};
}
/* Clear out SLOT. */
static void
symbol_cache_clear_slot (struct symbol_cache_slot *slot)
{
if (slot->state == SYMBOL_SLOT_NOT_FOUND)
xfree (slot->value.not_found.name);
slot->state = SYMBOL_SLOT_UNUSED;
}
/* Mark SYMBOL as found in SLOT.
OBJFILE_CONTEXT is the current objfile when the lookup was done, or NULL
if it's not needed to distinguish lookups (STATIC_BLOCK). It is *not*
necessarily the objfile the symbol was found in. */
static void
symbol_cache_mark_found (struct block_symbol_cache *bsc,
struct symbol_cache_slot *slot,
struct objfile *objfile_context,
struct symbol *symbol,
const struct block *block)
{
if (bsc == NULL)
return;
if (slot->state != SYMBOL_SLOT_UNUSED)
{
++bsc->collisions;
symbol_cache_clear_slot (slot);
}
slot->state = SYMBOL_SLOT_FOUND;
slot->objfile_context = objfile_context;
slot->value.found.symbol = symbol;
slot->value.found.block = block;
}
/* Mark symbol NAME, DOMAIN as not found in SLOT.
OBJFILE_CONTEXT is the current objfile when the lookup was done, or NULL
if it's not needed to distinguish lookups (STATIC_BLOCK). */
static void
symbol_cache_mark_not_found (struct block_symbol_cache *bsc,
struct symbol_cache_slot *slot,
struct objfile *objfile_context,
const char *name, domain_enum domain)
{
if (bsc == NULL)
return;
if (slot->state != SYMBOL_SLOT_UNUSED)
{
++bsc->collisions;
symbol_cache_clear_slot (slot);
}
slot->state = SYMBOL_SLOT_NOT_FOUND;
slot->objfile_context = objfile_context;
slot->value.not_found.name = xstrdup (name);
slot->value.not_found.domain = domain;
}
/* Flush the symbol cache of PSPACE. */
static void
symbol_cache_flush (struct program_space *pspace)
{
struct symbol_cache *cache
= (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
int pass;
if (cache == NULL)
return;
if (cache->global_symbols == NULL)
{
gdb_assert (symbol_cache_size == 0);
gdb_assert (cache->static_symbols == NULL);
return;
}
/* If the cache is untouched since the last flush, early exit.
This is important for performance during the startup of a program linked
with 100s (or 1000s) of shared libraries. */
if (cache->global_symbols->misses == 0
&& cache->static_symbols->misses == 0)
return;
gdb_assert (cache->global_symbols->size == symbol_cache_size);
gdb_assert (cache->static_symbols->size == symbol_cache_size);
for (pass = 0; pass < 2; ++pass)
{
struct block_symbol_cache *bsc
= pass == 0 ? cache->global_symbols : cache->static_symbols;
unsigned int i;
for (i = 0; i < bsc->size; ++i)
symbol_cache_clear_slot (&bsc->symbols[i]);
}
cache->global_symbols->hits = 0;
cache->global_symbols->misses = 0;
cache->global_symbols->collisions = 0;
cache->static_symbols->hits = 0;
cache->static_symbols->misses = 0;
cache->static_symbols->collisions = 0;
}
/* Dump CACHE. */
static void
symbol_cache_dump (const struct symbol_cache *cache)
{
int pass;
if (cache->global_symbols == NULL)
{
printf_filtered (" <disabled>\n");
return;
}
for (pass = 0; pass < 2; ++pass)
{
const struct block_symbol_cache *bsc
= pass == 0 ? cache->global_symbols : cache->static_symbols;
unsigned int i;
if (pass == 0)
printf_filtered ("Global symbols:\n");
else
printf_filtered ("Static symbols:\n");
for (i = 0; i < bsc->size; ++i)
{
const struct symbol_cache_slot *slot = &bsc->symbols[i];
QUIT;
switch (slot->state)
{
case SYMBOL_SLOT_UNUSED:
break;
case SYMBOL_SLOT_NOT_FOUND:
printf_filtered (" [%4u] = %s, %s %s (not found)\n", i,
host_address_to_string (slot->objfile_context),
slot->value.not_found.name,
domain_name (slot->value.not_found.domain));
break;
case SYMBOL_SLOT_FOUND:
{
struct symbol *found = slot->value.found.symbol;
const struct objfile *context = slot->objfile_context;
printf_filtered (" [%4u] = %s, %s %s\n", i,
host_address_to_string (context),
SYMBOL_PRINT_NAME (found),
domain_name (SYMBOL_DOMAIN (found)));
break;
}
}
}
}
}
/* The "mt print symbol-cache" command. */
static void
maintenance_print_symbol_cache (char *args, int from_tty)
{
struct program_space *pspace;
ALL_PSPACES (pspace)
{
struct symbol_cache *cache;
printf_filtered (_("Symbol cache for pspace %d\n%s:\n"),
pspace->num,
pspace->symfile_object_file != NULL
? objfile_name (pspace->symfile_object_file)
: "(no object file)");
/* If the cache hasn't been created yet, avoid creating one. */
cache
= (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
if (cache == NULL)
printf_filtered (" <empty>\n");
else
symbol_cache_dump (cache);
}
}
/* The "mt flush-symbol-cache" command. */
static void
maintenance_flush_symbol_cache (char *args, int from_tty)
{
struct program_space *pspace;
ALL_PSPACES (pspace)
{
symbol_cache_flush (pspace);
}
}
/* Print usage statistics of CACHE. */
static void
symbol_cache_stats (struct symbol_cache *cache)
{
int pass;
if (cache->global_symbols == NULL)
{
printf_filtered (" <disabled>\n");
return;
}
for (pass = 0; pass < 2; ++pass)
{
const struct block_symbol_cache *bsc
= pass == 0 ? cache->global_symbols : cache->static_symbols;
QUIT;
if (pass == 0)
printf_filtered ("Global block cache stats:\n");
else
printf_filtered ("Static block cache stats:\n");
printf_filtered (" size: %u\n", bsc->size);
printf_filtered (" hits: %u\n", bsc->hits);
printf_filtered (" misses: %u\n", bsc->misses);
printf_filtered (" collisions: %u\n", bsc->collisions);
}
}
/* The "mt print symbol-cache-statistics" command. */
static void
maintenance_print_symbol_cache_statistics (char *args, int from_tty)
{
struct program_space *pspace;
ALL_PSPACES (pspace)
{
struct symbol_cache *cache;
printf_filtered (_("Symbol cache statistics for pspace %d\n%s:\n"),
pspace->num,
pspace->symfile_object_file != NULL
? objfile_name (pspace->symfile_object_file)
: "(no object file)");
/* If the cache hasn't been created yet, avoid creating one. */
cache
= (struct symbol_cache *) program_space_data (pspace, symbol_cache_key);
if (cache == NULL)
printf_filtered (" empty, no stats available\n");
else
symbol_cache_stats (cache);
}
}
/* This module's 'new_objfile' observer. */
static void
symtab_new_objfile_observer (struct objfile *objfile)
{
/* Ideally we'd use OBJFILE->pspace, but OBJFILE may be NULL. */
symbol_cache_flush (current_program_space);
}
/* This module's 'free_objfile' observer. */
static void
symtab_free_objfile_observer (struct objfile *objfile)
{
symbol_cache_flush (objfile->pspace);
}
/* Debug symbols usually don't have section information. We need to dig that
out of the minimal symbols and stash that in the debug symbol. */
void
fixup_section (struct general_symbol_info *ginfo,
CORE_ADDR addr, struct objfile *objfile)
{
struct minimal_symbol *msym;
/* First, check whether a minimal symbol with the same name exists
and points to the same address. The address check is required
e.g. on PowerPC64, where the minimal symbol for a function will
point to the function descriptor, while the debug symbol will
point to the actual function code. */
msym = lookup_minimal_symbol_by_pc_name (addr, ginfo->name, objfile);
if (msym)
ginfo->section = MSYMBOL_SECTION (msym);
else
{
/* Static, function-local variables do appear in the linker
(minimal) symbols, but are frequently given names that won't
be found via lookup_minimal_symbol(). E.g., it has been
observed in frv-uclinux (ELF) executables that a static,
function-local variable named "foo" might appear in the
linker symbols as "foo.6" or "foo.3". Thus, there is no
point in attempting to extend the lookup-by-name mechanism to
handle this case due to the fact that there can be multiple
names.
So, instead, search the section table when lookup by name has
failed. The ``addr'' and ``endaddr'' fields may have already
been relocated. If so, the relocation offset (i.e. the
ANOFFSET value) needs to be subtracted from these values when
performing the comparison. We unconditionally subtract it,
because, when no relocation has been performed, the ANOFFSET
value will simply be zero.
The address of the symbol whose section we're fixing up HAS
NOT BEEN adjusted (relocated) yet. It can't have been since
the section isn't yet known and knowing the section is
necessary in order to add the correct relocation value. In
other words, we wouldn't even be in this function (attempting
to compute the section) if it were already known.
Note that it is possible to search the minimal symbols
(subtracting the relocation value if necessary) to find the
matching minimal symbol, but this is overkill and much less
efficient. It is not necessary to find the matching minimal
symbol, only its section.
Note that this technique (of doing a section table search)
can fail when unrelocated section addresses overlap. For
this reason, we still attempt a lookup by name prior to doing
a search of the section table. */
struct obj_section *s;
int fallback = -1;
ALL_OBJFILE_OSECTIONS (objfile, s)
{
int idx = s - objfile->sections;
CORE_ADDR offset = ANOFFSET (objfile->section_offsets, idx);
if (fallback == -1)
fallback = idx;
if (obj_section_addr (s) - offset <= addr
&& addr < obj_section_endaddr (s) - offset)
{
ginfo->section = idx;
return;
}
}
/* If we didn't find the section, assume it is in the first
section. If there is no allocated section, then it hardly
matters what we pick, so just pick zero. */
if (fallback == -1)
ginfo->section = 0;
else
ginfo->section = fallback;
}
}
struct symbol *
fixup_symbol_section (struct symbol *sym, struct objfile *objfile)
{
CORE_ADDR addr;
if (!sym)
return NULL;
if (!SYMBOL_OBJFILE_OWNED (sym))
return sym;
/* We either have an OBJFILE, or we can get at it from the sym's
symtab. Anything else is a bug. */
gdb_assert (objfile || symbol_symtab (sym));
if (objfile == NULL)
objfile = symbol_objfile (sym);
if (SYMBOL_OBJ_SECTION (objfile, sym))
return sym;
/* We should have an objfile by now. */
gdb_assert (objfile);
switch (SYMBOL_CLASS (sym))
{
case LOC_STATIC:
case LOC_LABEL:
addr = SYMBOL_VALUE_ADDRESS (sym);
break;
case LOC_BLOCK:
addr = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
break;
default:
/* Nothing else will be listed in the minsyms -- no use looking
it up. */
return sym;
}
fixup_section (&sym->ginfo, addr, objfile);
return sym;
}
/* Compute the demangled form of NAME as used by the various symbol
lookup functions. The result is stored in *RESULT_NAME. Returns a
cleanup which can be used to clean up the result.
For Ada, this function just sets *RESULT_NAME to NAME, unmodified.
Normally, Ada symbol lookups are performed using the encoded name
rather than the demangled name, and so it might seem to make sense
for this function to return an encoded version of NAME.
Unfortunately, we cannot do this, because this function is used in
circumstances where it is not appropriate to try to encode NAME.
For instance, when displaying the frame info, we demangle the name
of each parameter, and then perform a symbol lookup inside our
function using that demangled name. In Ada, certain functions
have internally-generated parameters whose name contain uppercase
characters. Encoding those name would result in those uppercase
characters to become lowercase, and thus cause the symbol lookup
to fail. */
struct cleanup *
demangle_for_lookup (const char *name, enum language lang,
const char **result_name)
{
char *demangled_name = NULL;
const char *modified_name = NULL;
struct cleanup *cleanup = make_cleanup (null_cleanup, 0);
modified_name = name;
/* If we are using C++, D, Go, or Java, demangle the name before doing a
lookup, so we can always binary search. */
if (lang == language_cplus)
{
demangled_name = gdb_demangle (name, DMGL_ANSI | DMGL_PARAMS);
if (demangled_name)
{
modified_name = demangled_name;
make_cleanup (xfree, demangled_name);
}
else
{
/* If we were given a non-mangled name, canonicalize it
according to the language (so far only for C++). */
demangled_name = cp_canonicalize_string (name);
if (demangled_name)
{
modified_name = demangled_name;
make_cleanup (xfree, demangled_name);
}
}
}
else if (lang == language_java)
{
demangled_name = gdb_demangle (name,
DMGL_ANSI | DMGL_PARAMS | DMGL_JAVA);
if (demangled_name)
{
modified_name = demangled_name;
make_cleanup (xfree, demangled_name);
}
}
else if (lang == language_d)
{
demangled_name = d_demangle (name, 0);
if (demangled_name)
{
modified_name = demangled_name;
make_cleanup (xfree, demangled_name);
}
}
else if (lang == language_go)
{
demangled_name = go_demangle (name, 0);
if (demangled_name)
{
modified_name = demangled_name;
make_cleanup (xfree, demangled_name);
}
}
*result_name = modified_name;
return cleanup;
}
/* See symtab.h.
This function (or rather its subordinates) have a bunch of loops and
it would seem to be attractive to put in some QUIT's (though I'm not really
sure whether it can run long enough to be really important). But there
are a few calls for which it would appear to be bad news to quit
out of here: e.g., find_proc_desc in alpha-mdebug-tdep.c. (Note
that there is C++ code below which can error(), but that probably
doesn't affect these calls since they are looking for a known
variable and thus can probably assume it will never hit the C++
code). */
struct block_symbol
lookup_symbol_in_language (const char *name, const struct block *block,
const domain_enum domain, enum language lang,
struct field_of_this_result *is_a_field_of_this)
{
const char *modified_name;
struct block_symbol returnval;
struct cleanup *cleanup = demangle_for_lookup (name, lang, &modified_name);
returnval = lookup_symbol_aux (modified_name, block, domain, lang,
is_a_field_of_this);
do_cleanups (cleanup);
return returnval;
}
/* See symtab.h. */
struct block_symbol
lookup_symbol (const char *name, const struct block *block,
domain_enum domain,
struct field_of_this_result *is_a_field_of_this)
{
return lookup_symbol_in_language (name, block, domain,
current_language->la_language,
is_a_field_of_this);
}
/* See symtab.h. */
struct block_symbol
lookup_language_this (const struct language_defn *lang,
const struct block *block)
{
if (lang->la_name_of_this == NULL || block == NULL)
return (struct block_symbol) {NULL, NULL};
if (symbol_lookup_debug > 1)
{
struct objfile *objfile = lookup_objfile_from_block (block);
fprintf_unfiltered (gdb_stdlog,
"lookup_language_this (%s, %s (objfile %s))",
lang->la_name, host_address_to_string (block),
objfile_debug_name (objfile));
}
while (block)
{
struct symbol *sym;
sym = block_lookup_symbol (block, lang->la_name_of_this, VAR_DOMAIN);
if (sym != NULL)
{
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog, " = %s (%s, block %s)\n",
SYMBOL_PRINT_NAME (sym),
host_address_to_string (sym),
host_address_to_string (block));
}
return (struct block_symbol) {sym, block};
}
if (BLOCK_FUNCTION (block))
break;
block = BLOCK_SUPERBLOCK (block);
}
if (symbol_lookup_debug > 1)
fprintf_unfiltered (gdb_stdlog, " = NULL\n");
return (struct block_symbol) {NULL, NULL};
}
/* Given TYPE, a structure/union,
return 1 if the component named NAME from the ultimate target
structure/union is defined, otherwise, return 0. */
static int
check_field (struct type *type, const char *name,
struct field_of_this_result *is_a_field_of_this)
{
int i;
/* The type may be a stub. */
type = check_typedef (type);
for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
{
const char *t_field_name = TYPE_FIELD_NAME (type, i);
if (t_field_name && (strcmp_iw (t_field_name, name) == 0))
{
is_a_field_of_this->type = type;
is_a_field_of_this->field = &TYPE_FIELD (type, i);
return 1;
}
}
/* C++: If it was not found as a data field, then try to return it
as a pointer to a method. */
for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
{
if (strcmp_iw (TYPE_FN_FIELDLIST_NAME (type, i), name) == 0)
{
is_a_field_of_this->type = type;
is_a_field_of_this->fn_field = &TYPE_FN_FIELDLIST (type, i);
return 1;
}
}
for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
if (check_field (TYPE_BASECLASS (type, i), name, is_a_field_of_this))
return 1;
return 0;
}
/* Behave like lookup_symbol except that NAME is the natural name
(e.g., demangled name) of the symbol that we're looking for. */
static struct block_symbol
lookup_symbol_aux (const char *name, const struct block *block,
const domain_enum domain, enum language language,
struct field_of_this_result *is_a_field_of_this)
{
struct block_symbol result;
const struct language_defn *langdef;
if (symbol_lookup_debug)
{
struct objfile *objfile = lookup_objfile_from_block (block);
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_aux (%s, %s (objfile %s), %s, %s)\n",
name, host_address_to_string (block),
objfile != NULL
? objfile_debug_name (objfile) : "NULL",
domain_name (domain), language_str (language));
}
/* Make sure we do something sensible with is_a_field_of_this, since
the callers that set this parameter to some non-null value will
certainly use it later. If we don't set it, the contents of
is_a_field_of_this are undefined. */
if (is_a_field_of_this != NULL)
memset (is_a_field_of_this, 0, sizeof (*is_a_field_of_this));
/* Search specified block and its superiors. Don't search
STATIC_BLOCK or GLOBAL_BLOCK. */
result = lookup_local_symbol (name, block, domain, language);
if (result.symbol != NULL)
{
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog, "lookup_symbol_aux (...) = %s\n",
host_address_to_string (result.symbol));
}
return result;
}
/* If requested to do so by the caller and if appropriate for LANGUAGE,
check to see if NAME is a field of `this'. */
langdef = language_def (language);
/* Don't do this check if we are searching for a struct. It will
not be found by check_field, but will be found by other
means. */
if (is_a_field_of_this != NULL && domain != STRUCT_DOMAIN)
{
result = lookup_language_this (langdef, block);
if (result.symbol)
{
struct type *t = result.symbol->type;
/* I'm not really sure that type of this can ever
be typedefed; just be safe. */
t = check_typedef (t);
if (TYPE_CODE (t) == TYPE_CODE_PTR
|| TYPE_CODE (t) == TYPE_CODE_REF)
t = TYPE_TARGET_TYPE (t);
if (TYPE_CODE (t) != TYPE_CODE_STRUCT
&& TYPE_CODE (t) != TYPE_CODE_UNION)
error (_("Internal error: `%s' is not an aggregate"),
langdef->la_name_of_this);
if (check_field (t, name, is_a_field_of_this))
{
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_aux (...) = NULL\n");
}
return (struct block_symbol) {NULL, NULL};
}
}
}
/* Now do whatever is appropriate for LANGUAGE to look
up static and global variables. */
result = langdef->la_lookup_symbol_nonlocal (langdef, name, block, domain);
if (result.symbol != NULL)
{
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog, "lookup_symbol_aux (...) = %s\n",
host_address_to_string (result.symbol));
}
return result;
}
/* Now search all static file-level symbols. Not strictly correct,
but more useful than an error. */
result = lookup_static_symbol (name, domain);
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog, "lookup_symbol_aux (...) = %s\n",
result.symbol != NULL
? host_address_to_string (result.symbol)
: "NULL");
}
return result;
}
/* Check to see if the symbol is defined in BLOCK or its superiors.
Don't search STATIC_BLOCK or GLOBAL_BLOCK. */
static struct block_symbol
lookup_local_symbol (const char *name, const struct block *block,
const domain_enum domain,
enum language language)
{
struct symbol *sym;
const struct block *static_block = block_static_block (block);
const char *scope = block_scope (block);
/* Check if either no block is specified or it's a global block. */
if (static_block == NULL)
return (struct block_symbol) {NULL, NULL};
while (block != static_block)
{
sym = lookup_symbol_in_block (name, block, domain);
if (sym != NULL)
return (struct block_symbol) {sym, block};
if (language == language_cplus || language == language_fortran)
{
struct block_symbol sym
= cp_lookup_symbol_imports_or_template (scope, name, block,
domain);
if (sym.symbol != NULL)
return sym;
}
if (BLOCK_FUNCTION (block) != NULL && block_inlined_p (block))
break;
block = BLOCK_SUPERBLOCK (block);
}
/* We've reached the end of the function without finding a result. */
return (struct block_symbol) {NULL, NULL};
}
/* See symtab.h. */
struct objfile *
lookup_objfile_from_block (const struct block *block)
{
struct objfile *obj;
struct compunit_symtab *cust;
if (block == NULL)
return NULL;
block = block_global_block (block);
/* Look through all blockvectors. */
ALL_COMPUNITS (obj, cust)
if (block == BLOCKVECTOR_BLOCK (COMPUNIT_BLOCKVECTOR (cust),
GLOBAL_BLOCK))
{
if (obj->separate_debug_objfile_backlink)
obj = obj->separate_debug_objfile_backlink;
return obj;
}
return NULL;
}
/* See symtab.h. */
struct symbol *
lookup_symbol_in_block (const char *name, const struct block *block,
const domain_enum domain)
{
struct symbol *sym;
if (symbol_lookup_debug > 1)
{
struct objfile *objfile = lookup_objfile_from_block (block);
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_block (%s, %s (objfile %s), %s)",
name, host_address_to_string (block),
objfile_debug_name (objfile),
domain_name (domain));
}
sym = block_lookup_symbol (block, name, domain);
if (sym)
{
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog, " = %s\n",
host_address_to_string (sym));
}
return fixup_symbol_section (sym, NULL);
}
if (symbol_lookup_debug > 1)
fprintf_unfiltered (gdb_stdlog, " = NULL\n");
return NULL;
}
/* See symtab.h. */
struct block_symbol
lookup_global_symbol_from_objfile (struct objfile *main_objfile,
const char *name,
const domain_enum domain)
{
struct objfile *objfile;
for (objfile = main_objfile;
objfile;
objfile = objfile_separate_debug_iterate (main_objfile, objfile))
{
struct block_symbol result
= lookup_symbol_in_objfile (objfile, GLOBAL_BLOCK, name, domain);
if (result.symbol != NULL)
return result;
}
return (struct block_symbol) {NULL, NULL};
}
/* Check to see if the symbol is defined in one of the OBJFILE's
symtabs. BLOCK_INDEX should be either GLOBAL_BLOCK or STATIC_BLOCK,
depending on whether or not we want to search global symbols or
static symbols. */
static struct block_symbol
lookup_symbol_in_objfile_symtabs (struct objfile *objfile, int block_index,
const char *name, const domain_enum domain)
{
struct compunit_symtab *cust;
gdb_assert (block_index == GLOBAL_BLOCK || block_index == STATIC_BLOCK);
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_objfile_symtabs (%s, %s, %s, %s)",
objfile_debug_name (objfile),
block_index == GLOBAL_BLOCK
? "GLOBAL_BLOCK" : "STATIC_BLOCK",
name, domain_name (domain));
}
ALL_OBJFILE_COMPUNITS (objfile, cust)
{
const struct blockvector *bv;
const struct block *block;
struct block_symbol result;
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
result.symbol = block_lookup_symbol_primary (block, name, domain);
result.block = block;
if (result.symbol != NULL)
{
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog, " = %s (block %s)\n",
host_address_to_string (result.symbol),
host_address_to_string (block));
}
result.symbol = fixup_symbol_section (result.symbol, objfile);
return result;
}
}
if (symbol_lookup_debug > 1)
fprintf_unfiltered (gdb_stdlog, " = NULL\n");
return (struct block_symbol) {NULL, NULL};
}
/* Wrapper around lookup_symbol_in_objfile_symtabs for search_symbols.
Look up LINKAGE_NAME in DOMAIN in the global and static blocks of OBJFILE
and all associated separate debug objfiles.
Normally we only look in OBJFILE, and not any separate debug objfiles
because the outer loop will cause them to be searched too. This case is
different. Here we're called from search_symbols where it will only
call us for the the objfile that contains a matching minsym. */
static struct block_symbol
lookup_symbol_in_objfile_from_linkage_name (struct objfile *objfile,
const char *linkage_name,
domain_enum domain)
{
enum language lang = current_language->la_language;
const char *modified_name;
struct cleanup *cleanup = demangle_for_lookup (linkage_name, lang,
&modified_name);
struct objfile *main_objfile, *cur_objfile;
if (objfile->separate_debug_objfile_backlink)
main_objfile = objfile->separate_debug_objfile_backlink;
else
main_objfile = objfile;
for (cur_objfile = main_objfile;
cur_objfile;
cur_objfile = objfile_separate_debug_iterate (main_objfile, cur_objfile))
{
struct block_symbol result;
result = lookup_symbol_in_objfile_symtabs (cur_objfile, GLOBAL_BLOCK,
modified_name, domain);
if (result.symbol == NULL)
result = lookup_symbol_in_objfile_symtabs (cur_objfile, STATIC_BLOCK,
modified_name, domain);
if (result.symbol != NULL)
{
do_cleanups (cleanup);
return result;
}
}
do_cleanups (cleanup);
return (struct block_symbol) {NULL, NULL};
}
/* A helper function that throws an exception when a symbol was found
in a psymtab but not in a symtab. */
static void ATTRIBUTE_NORETURN
error_in_psymtab_expansion (int block_index, const char *name,
struct compunit_symtab *cust)
{
error (_("\
Internal: %s symbol `%s' found in %s psymtab but not in symtab.\n\
%s may be an inlined function, or may be a template function\n \
(if a template, try specifying an instantiation: %s<type>)."),
block_index == GLOBAL_BLOCK ? "global" : "static",
name,
symtab_to_filename_for_display (compunit_primary_filetab (cust)),
name, name);
}
/* A helper function for various lookup routines that interfaces with
the "quick" symbol table functions. */
static struct block_symbol
lookup_symbol_via_quick_fns (struct objfile *objfile, int block_index,
const char *name, const domain_enum domain)
{
struct compunit_symtab *cust;
const struct blockvector *bv;
const struct block *block;
struct block_symbol result;
if (!objfile->sf)
return (struct block_symbol) {NULL, NULL};
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_via_quick_fns (%s, %s, %s, %s)\n",
objfile_debug_name (objfile),
block_index == GLOBAL_BLOCK
? "GLOBAL_BLOCK" : "STATIC_BLOCK",
name, domain_name (domain));
}
cust = objfile->sf->qf->lookup_symbol (objfile, block_index, name, domain);
if (cust == NULL)
{
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_via_quick_fns (...) = NULL\n");
}
return (struct block_symbol) {NULL, NULL};
}
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
result.symbol = block_lookup_symbol (block, name, domain);
if (result.symbol == NULL)
error_in_psymtab_expansion (block_index, name, cust);
if (symbol_lookup_debug > 1)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_via_quick_fns (...) = %s (block %s)\n",
host_address_to_string (result.symbol),
host_address_to_string (block));
}
result.symbol = fixup_symbol_section (result.symbol, objfile);
result.block = block;
return result;
}
/* See symtab.h. */
struct block_symbol
basic_lookup_symbol_nonlocal (const struct language_defn *langdef,
const char *name,
const struct block *block,
const domain_enum domain)
{
struct block_symbol result;
/* NOTE: carlton/2003-05-19: The comments below were written when
this (or what turned into this) was part of lookup_symbol_aux;
I'm much less worried about these questions now, since these
decisions have turned out well, but I leave these comments here
for posterity. */
/* NOTE: carlton/2002-12-05: There is a question as to whether or
not it would be appropriate to search the current global block
here as well. (That's what this code used to do before the
is_a_field_of_this check was moved up.) On the one hand, it's
redundant with the lookup in all objfiles search that happens
next. On the other hand, if decode_line_1 is passed an argument
like filename:var, then the user presumably wants 'var' to be
searched for in filename. On the third hand, there shouldn't be
multiple global variables all of which are named 'var', and it's
not like decode_line_1 has ever restricted its search to only
global variables in a single filename. All in all, only
searching the static block here seems best: it's correct and it's
cleanest. */
/* NOTE: carlton/2002-12-05: There's also a possible performance
issue here: if you usually search for global symbols in the
current file, then it would be slightly better to search the
current global block before searching all the symtabs. But there
are other factors that have a much greater effect on performance
than that one, so I don't think we should worry about that for
now. */
/* NOTE: dje/2014-10-26: The lookup in all objfiles search could skip
the current objfile. Searching the current objfile first is useful
for both matching user expectations as well as performance. */
result = lookup_symbol_in_static_block (name, block, domain);
if (result.symbol != NULL)
return result;
/* If we didn't find a definition for a builtin type in the static block,
search for it now. This is actually the right thing to do and can be
a massive performance win. E.g., when debugging a program with lots of
shared libraries we could search all of them only to find out the
builtin type isn't defined in any of them. This is common for types
like "void". */
if (domain == VAR_DOMAIN)
{
struct gdbarch *gdbarch;
if (block == NULL)
gdbarch = target_gdbarch ();
else
gdbarch = block_gdbarch (block);
result.symbol = language_lookup_primitive_type_as_symbol (langdef,
gdbarch, name);
result.block = NULL;
if (result.symbol != NULL)
return result;
}
return lookup_global_symbol (name, block, domain);
}
/* See symtab.h. */
struct block_symbol
lookup_symbol_in_static_block (const char *name,
const struct block *block,
const domain_enum domain)
{
const struct block *static_block = block_static_block (block);
struct symbol *sym;
if (static_block == NULL)
return (struct block_symbol) {NULL, NULL};
if (symbol_lookup_debug)
{
struct objfile *objfile = lookup_objfile_from_block (static_block);
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_static_block (%s, %s (objfile %s),"
" %s)\n",
name,
host_address_to_string (block),
objfile_debug_name (objfile),
domain_name (domain));
}
sym = lookup_symbol_in_block (name, static_block, domain);
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_static_block (...) = %s\n",
sym != NULL ? host_address_to_string (sym) : "NULL");
}
return (struct block_symbol) {sym, static_block};
}
/* Perform the standard symbol lookup of NAME in OBJFILE:
1) First search expanded symtabs, and if not found
2) Search the "quick" symtabs (partial or .gdb_index).
BLOCK_INDEX is one of GLOBAL_BLOCK or STATIC_BLOCK. */
static struct block_symbol
lookup_symbol_in_objfile (struct objfile *objfile, int block_index,
const char *name, const domain_enum domain)
{
struct block_symbol result;
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_objfile (%s, %s, %s, %s)\n",
objfile_debug_name (objfile),
block_index == GLOBAL_BLOCK
? "GLOBAL_BLOCK" : "STATIC_BLOCK",
name, domain_name (domain));
}
result = lookup_symbol_in_objfile_symtabs (objfile, block_index,
name, domain);
if (result.symbol != NULL)
{
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_objfile (...) = %s"
" (in symtabs)\n",
host_address_to_string (result.symbol));
}
return result;
}
result = lookup_symbol_via_quick_fns (objfile, block_index,
name, domain);
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
"lookup_symbol_in_objfile (...) = %s%s\n",
result.symbol != NULL
? host_address_to_string (result.symbol)
: "NULL",
result.symbol != NULL ? " (via quick fns)" : "");
}
return result;
}
/* See symtab.h. */
struct block_symbol
lookup_static_symbol (const char *name, const domain_enum domain)
{
struct symbol_cache *cache = get_symbol_cache (current_program_space);
struct objfile *objfile;
struct block_symbol result;
struct block_symbol_cache *bsc;
struct symbol_cache_slot *slot;
/* Lookup in STATIC_BLOCK is not current-objfile-dependent, so just pass
NULL for OBJFILE_CONTEXT. */
result = symbol_cache_lookup (cache, NULL, STATIC_BLOCK, name, domain,
&bsc, &slot);
if (result.symbol != NULL)
{
if (SYMBOL_LOOKUP_FAILED_P (result))
return (struct block_symbol) {NULL, NULL};
return result;
}
ALL_OBJFILES (objfile)
{
result = lookup_symbol_in_objfile (objfile, STATIC_BLOCK, name, domain);
if (result.symbol != NULL)
{
/* Still pass NULL for OBJFILE_CONTEXT here. */
symbol_cache_mark_found (bsc, slot, NULL, result.symbol,
result.block);
return result;
}
}
/* Still pass NULL for OBJFILE_CONTEXT here. */
symbol_cache_mark_not_found (bsc, slot, NULL, name, domain);
return (struct block_symbol) {NULL, NULL};
}
/* Private data to be used with lookup_symbol_global_iterator_cb. */
struct global_sym_lookup_data
{
/* The name of the symbol we are searching for. */
const char *name;
/* The domain to use for our search. */
domain_enum domain;
/* The field where the callback should store the symbol if found.
It should be initialized to {NULL, NULL} before the search is started. */
struct block_symbol result;
};
/* A callback function for gdbarch_iterate_over_objfiles_in_search_order.
It searches by name for a symbol in the GLOBAL_BLOCK of the given
OBJFILE. The arguments for the search are passed via CB_DATA,
which in reality is a pointer to struct global_sym_lookup_data. */
static int
lookup_symbol_global_iterator_cb (struct objfile *objfile,
void *cb_data)
{
struct global_sym_lookup_data *data =
(struct global_sym_lookup_data *) cb_data;
gdb_assert (data->result.symbol == NULL
&& data->result.block == NULL);
data->result = lookup_symbol_in_objfile (objfile, GLOBAL_BLOCK,
data->name, data->domain);
/* If we found a match, tell the iterator to stop. Otherwise,
keep going. */
return (data->result.symbol != NULL);
}
/* See symtab.h. */
struct block_symbol
lookup_global_symbol (const char *name,
const struct block *block,
const domain_enum domain)
{
struct symbol_cache *cache = get_symbol_cache (current_program_space);
struct block_symbol result;
struct objfile *objfile;
struct global_sym_lookup_data lookup_data;
struct block_symbol_cache *bsc;
struct symbol_cache_slot *slot;
objfile = lookup_objfile_from_block (block);
/* First see if we can find the symbol in the cache.
This works because we use the current objfile to qualify the lookup. */
result = symbol_cache_lookup (cache, objfile, GLOBAL_BLOCK, name, domain,
&bsc, &slot);
if (result.symbol != NULL)
{
if (SYMBOL_LOOKUP_FAILED_P (result))
return (struct block_symbol) {NULL, NULL};
return result;
}
/* Call library-specific lookup procedure. */
if (objfile != NULL)
result = solib_global_lookup (objfile, name, domain);
/* If that didn't work go a global search (of global blocks, heh). */
if (result.symbol == NULL)
{
memset (&lookup_data, 0, sizeof (lookup_data));
lookup_data.name = name;
lookup_data.domain = domain;
gdbarch_iterate_over_objfiles_in_search_order
(objfile != NULL ? get_objfile_arch (objfile) : target_gdbarch (),
lookup_symbol_global_iterator_cb, &lookup_data, objfile);
result = lookup_data.result;
}
if (result.symbol != NULL)
symbol_cache_mark_found (bsc, slot, objfile, result.symbol, result.block);
else
symbol_cache_mark_not_found (bsc, slot, objfile, name, domain);
return result;
}
int
symbol_matches_domain (enum language symbol_language,
domain_enum symbol_domain,
domain_enum domain)
{
/* For C++ "struct foo { ... }" also defines a typedef for "foo".
A Java class declaration also defines a typedef for the class.
Similarly, any Ada type declaration implicitly defines a typedef. */
if (symbol_language == language_cplus
|| symbol_language == language_d
|| symbol_language == language_java
|| symbol_language == language_ada)
{
if ((domain == VAR_DOMAIN || domain == STRUCT_DOMAIN)
&& symbol_domain == STRUCT_DOMAIN)
return 1;
}
/* For all other languages, strict match is required. */
return (symbol_domain == domain);
}
/* See symtab.h. */
struct type *
lookup_transparent_type (const char *name)
{
return current_language->la_lookup_transparent_type (name);
}
/* A helper for basic_lookup_transparent_type that interfaces with the
"quick" symbol table functions. */
static struct type *
basic_lookup_transparent_type_quick (struct objfile *objfile, int block_index,
const char *name)
{
struct compunit_symtab *cust;
const struct blockvector *bv;
struct block *block;
struct symbol *sym;
if (!objfile->sf)
return NULL;
cust = objfile->sf->qf->lookup_symbol (objfile, block_index, name,
STRUCT_DOMAIN);
if (cust == NULL)
return NULL;
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
sym = block_find_symbol (block, name, STRUCT_DOMAIN,
block_find_non_opaque_type, NULL);
if (sym == NULL)
error_in_psymtab_expansion (block_index, name, cust);
gdb_assert (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)));
return SYMBOL_TYPE (sym);
}
/* Subroutine of basic_lookup_transparent_type to simplify it.
Look up the non-opaque definition of NAME in BLOCK_INDEX of OBJFILE.
BLOCK_INDEX is either GLOBAL_BLOCK or STATIC_BLOCK. */
static struct type *
basic_lookup_transparent_type_1 (struct objfile *objfile, int block_index,
const char *name)
{
const struct compunit_symtab *cust;
const struct blockvector *bv;
const struct block *block;
const struct symbol *sym;
ALL_OBJFILE_COMPUNITS (objfile, cust)
{
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
sym = block_find_symbol (block, name, STRUCT_DOMAIN,
block_find_non_opaque_type, NULL);
if (sym != NULL)
{
gdb_assert (!TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)));
return SYMBOL_TYPE (sym);
}
}
return NULL;
}
/* The standard implementation of lookup_transparent_type. This code
was modeled on lookup_symbol -- the parts not relevant to looking
up types were just left out. In particular it's assumed here that
types are available in STRUCT_DOMAIN and only in file-static or
global blocks. */
struct type *
basic_lookup_transparent_type (const char *name)
{
struct objfile *objfile;
struct type *t;
/* Now search all the global symbols. Do the symtab's first, then
check the psymtab's. If a psymtab indicates the existence
of the desired name as a global, then do psymtab-to-symtab
conversion on the fly and return the found symbol. */
ALL_OBJFILES (objfile)
{
t = basic_lookup_transparent_type_1 (objfile, GLOBAL_BLOCK, name);
if (t)
return t;
}
ALL_OBJFILES (objfile)
{
t = basic_lookup_transparent_type_quick (objfile, GLOBAL_BLOCK, name);
if (t)
return t;
}
/* Now search the static file-level symbols.
Not strictly correct, but more useful than an error.
Do the symtab's first, then
check the psymtab's. If a psymtab indicates the existence
of the desired name as a file-level static, then do psymtab-to-symtab
conversion on the fly and return the found symbol. */
ALL_OBJFILES (objfile)
{
t = basic_lookup_transparent_type_1 (objfile, STATIC_BLOCK, name);
if (t)
return t;
}
ALL_OBJFILES (objfile)
{
t = basic_lookup_transparent_type_quick (objfile, STATIC_BLOCK, name);
if (t)
return t;
}
return (struct type *) 0;
}
/* Iterate over the symbols named NAME, matching DOMAIN, in BLOCK.
For each symbol that matches, CALLBACK is called. The symbol and
DATA are passed to the callback.
If CALLBACK returns zero, the iteration ends. Otherwise, the
search continues. */
void
iterate_over_symbols (const struct block *block, const char *name,
const domain_enum domain,
symbol_found_callback_ftype *callback,
void *data)
{
struct block_iterator iter;
struct symbol *sym;
ALL_BLOCK_SYMBOLS_WITH_NAME (block, name, iter, sym)
{
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
SYMBOL_DOMAIN (sym), domain))
{
if (!callback (sym, data))
return;
}
}
}
/* Find the compunit symtab associated with PC and SECTION.
This will read in debug info as necessary. */
struct compunit_symtab *
find_pc_sect_compunit_symtab (CORE_ADDR pc, struct obj_section *section)
{
struct compunit_symtab *cust;
struct compunit_symtab *best_cust = NULL;
struct objfile *objfile;
CORE_ADDR distance = 0;
struct bound_minimal_symbol msymbol;
/* If we know that this is not a text address, return failure. This is
necessary because we loop based on the block's high and low code
addresses, which do not include the data ranges, and because
we call find_pc_sect_psymtab which has a similar restriction based
on the partial_symtab's texthigh and textlow. */
msymbol = lookup_minimal_symbol_by_pc_section (pc, section);
if (msymbol.minsym
&& (MSYMBOL_TYPE (msymbol.minsym) == mst_data
|| MSYMBOL_TYPE (msymbol.minsym) == mst_bss
|| MSYMBOL_TYPE (msymbol.minsym) == mst_abs
|| MSYMBOL_TYPE (msymbol.minsym) == mst_file_data
|| MSYMBOL_TYPE (msymbol.minsym) == mst_file_bss))
return NULL;
/* Search all symtabs for the one whose file contains our address, and which
is the smallest of all the ones containing the address. This is designed
to deal with a case like symtab a is at 0x1000-0x2000 and 0x3000-0x4000
and symtab b is at 0x2000-0x3000. So the GLOBAL_BLOCK for a is from
0x1000-0x4000, but for address 0x2345 we want to return symtab b.
This happens for native ecoff format, where code from included files