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/* Symbol table lookup for the GNU debugger, GDB.
Copyright (C) 1986-2004, 2007-2012 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 "call-cmds.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 "hashtab.h"
#include "gdb_obstack.h"
#include "block.h"
#include "dictionary.h"
#include <sys/types.h>
#include <fcntl.h>
#include "gdb_string.h"
#include "gdb_stat.h"
#include <ctype.h>
#include "cp-abi.h"
#include "cp-support.h"
#include "observer.h"
#include "gdb_assert.h"
#include "solist.h"
#include "macrotab.h"
#include "macroscope.h"
#include "psymtab.h"
/* Prototypes for local functions */
static void rbreak_command (char *, int);
static void types_info (char *, int);
static void functions_info (char *, int);
static void variables_info (char *, int);
static void sources_info (char *, int);
static int find_line_common (struct linetable *, int, int *, int);
static struct symbol *lookup_symbol_aux (const char *name,
const struct block *block,
const domain_enum domain,
enum language language,
int *is_a_field_of_this);
static
struct symbol *lookup_symbol_aux_local (const char *name,
const struct block *block,
const domain_enum domain,
enum language language);
static
struct symbol *lookup_symbol_aux_symtabs (int block_index,
const char *name,
const domain_enum domain);
static
struct symbol *lookup_symbol_aux_quick (struct objfile *objfile,
int block_index,
const char *name,
const domain_enum domain);
static void print_msymbol_info (struct minimal_symbol *);
void _initialize_symtab (void);
/* */
/* When non-zero, print debugging messages related to symtab creation. */
int symtab_create_debug = 0;
/* 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;
}
/* Block in which the most recently searched-for symbol was found.
Might be better to make this a parameter to lookup_symbol and
value_of_this. */
const struct block *block_found;
/* 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). SEARCH_LEN is the length of
SEARCH_NAME. We assume that SEARCH_NAME is a relative path.
Returns true if they match, false otherwise. */
int
compare_filenames_for_search (const char *filename, const char *search_name,
int search_len)
{
int len = strlen (filename);
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. */
return (len == search_len
|| IS_DIR_SEPARATOR (filename[len - search_len - 1])
|| (HAS_DRIVE_SPEC (filename)
&& STRIP_DRIVE_SPEC (filename) == &filename[len - search_len]));
}
/* Check for a symtab of a specific name by searching some symtabs.
This is a helper function for callbacks of iterate_over_symtabs.
The return value, NAME, FULL_PATH, 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 symtabs to search.
AFTER_LAST is one past the last symtab to search; NULL means to
search until the end of the list. */
int
iterate_over_some_symtabs (const char *name,
const char *full_path,
const char *real_path,
int (*callback) (struct symtab *symtab,
void *data),
void *data,
struct symtab *first,
struct symtab *after_last)
{
struct symtab *s = NULL;
const char* base_name = lbasename (name);
int name_len = strlen (name);
int is_abs = IS_ABSOLUTE_PATH (name);
for (s = first; s != NULL && s != after_last; s = s->next)
{
/* Exact match is always ok. */
if (FILENAME_CMP (name, s->filename) == 0)
{
if (callback (s, data))
return 1;
}
if (!is_abs && compare_filenames_for_search (s->filename, name, name_len))
{
if (callback (s, data))
return 1;
}
/* 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 the user gave us an absolute path, try to find the file in
this symtab and use its absolute path. */
if (full_path != NULL)
{
const char *fp = symtab_to_fullname (s);
if (fp != NULL && FILENAME_CMP (full_path, fp) == 0)
{
if (callback (s, data))
return 1;
}
if (fp != NULL && !is_abs && compare_filenames_for_search (fp, name,
name_len))
{
if (callback (s, data))
return 1;
}
}
if (real_path != NULL)
{
char *fullname = symtab_to_fullname (s);
if (fullname != NULL)
{
char *rp = gdb_realpath (fullname);
make_cleanup (xfree, rp);
if (FILENAME_CMP (real_path, rp) == 0)
{
if (callback (s, data))
return 1;
}
if (!is_abs && compare_filenames_for_search (rp, name, name_len))
{
if (callback (s, data))
return 1;
}
}
}
}
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 symtab *s = NULL;
struct objfile *objfile;
char *real_path = NULL;
char *full_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))
{
full_path = xfullpath (name);
make_cleanup (xfree, full_path);
real_path = gdb_realpath (name);
make_cleanup (xfree, real_path);
}
ALL_OBJFILES (objfile)
{
if (iterate_over_some_symtabs (name, full_path, real_path, callback, data,
objfile->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,
full_path,
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 = 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. */
char *const_prefix = method->is_const ? "C" : "";
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 = (strncmp (physname, "__dt", 4) == 0);
if (is_destructor || is_full_physname_constructor)
{
mangled_name = (char *) xmalloc (strlen (physname) + 1);
strcpy (mangled_name, physname);
return mangled_name;
}
if (len == 0)
{
sprintf (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. */
sprintf (buf, "__%s%s", const_prefix, volatile_prefix);
newname = NULL;
len = 0;
}
else
{
sprintf (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);
}
/* Initialize the cplus_specific structure. 'cplus_specific' should
only be allocated for use with cplus symbols. */
static void
symbol_init_cplus_specific (struct general_symbol_info *gsymbol,
struct objfile *objfile)
{
/* A language_specific structure should not have been previously
initialized. */
gdb_assert (gsymbol->language_specific.cplus_specific == NULL);
gdb_assert (objfile != NULL);
gsymbol->language_specific.cplus_specific =
OBSTACK_ZALLOC (&objfile->objfile_obstack, struct cplus_specific);
}
/* Set the demangled name of GSYMBOL to NAME. NAME must be already
correctly allocated. For C++ symbols a cplus_specific struct is
allocated so OBJFILE must not be NULL. If this is a non C++ symbol
OBJFILE can be NULL. */
void
symbol_set_demangled_name (struct general_symbol_info *gsymbol,
char *name,
struct objfile *objfile)
{
if (gsymbol->language == language_cplus)
{
if (gsymbol->language_specific.cplus_specific == NULL)
symbol_init_cplus_specific (gsymbol, objfile);
gsymbol->language_specific.cplus_specific->demangled_name = name;
}
else
gsymbol->language_specific.mangled_lang.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_cplus)
{
if (gsymbol->language_specific.cplus_specific != NULL)
return gsymbol->language_specific.cplus_specific->demangled_name;
else
return NULL;
}
else
return gsymbol->language_specific.mangled_lang.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)
{
gsymbol->language = language;
if (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, NULL);
}
else if (gsymbol->language == language_cplus)
gsymbol->language_specific.cplus_specific = NULL;
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
{
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 = 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 = a;
const struct demangled_name_entry *db = 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->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;
if (gsymbol->language == language_unknown)
gsymbol->language = language_auto;
if (gsymbol->language == language_objc
|| gsymbol->language == language_auto)
{
demangled =
objc_demangle (mangled, 0);
if (demangled != NULL)
{
gsymbol->language = language_objc;
return demangled;
}
}
if (gsymbol->language == language_cplus
|| gsymbol->language == language_auto)
{
demangled =
cplus_demangle (mangled, DMGL_PARAMS | DMGL_ANSI);
if (demangled != NULL)
{
gsymbol->language = language_cplus;
return demangled;
}
}
if (gsymbol->language == language_java)
{
demangled =
cplus_demangle (mangled,
DMGL_PARAMS | DMGL_ANSI | DMGL_JAVA);
if (demangled != NULL)
{
gsymbol->language = language_java;
return demangled;
}
}
if (gsymbol->language == language_d
|| gsymbol->language == language_auto)
{
demangled = d_demangle(mangled, 0);
if (demangled != NULL)
{
gsymbol->language = language_d;
return demangled;
}
}
/* FIXME(dje): Continually adding languages here is clumsy.
Better to just call la_demangle if !auto, and if auto then call
a utility routine that tries successive languages in turn and reports
which one it finds. I realize the la_demangle options may be different
for different languages but there's already a FIXME for that. */
if (gsymbol->language == language_go
|| gsymbol->language == language_auto)
{
demangled = go_demangle (mangled, 0);
if (demangled != NULL)
{
gsymbol->language = language_go;
return demangled;
}
}
/* We could support `gsymbol->language == language_fortran' here to provide
module namespaces also for inferiors with only minimal symbol table (ELF
symbols). Just the mangling standard is not standardized across compilers
and there is no DW_AT_producer available for inferiors with only the ELF
symbols to check the mangling kind. */
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 that objfile's objfile_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;
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 = obstack_alloc (&objfile->objfile_obstack, len + 1);
memcpy (name, linkage_name, len);
name[len] = '\0';
gsymbol->name = name;
}
symbol_set_demangled_name (gsymbol, NULL, NULL);
return;
}
if (objfile->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 = 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 = 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 = (char *) lookup_name;
slot = ((struct demangled_name_entry **)
htab_find_slot (objfile->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 = obstack_alloc (&objfile->objfile_obstack,
offsetof (struct demangled_name_entry,
demangled)
+ demangled_len + 1);
(*slot)->mangled = (char *) lookup_name;
}
else
{
/* If we must copy the mangled name, put it directly after
the demangled name so we can have a single
allocation. */
*slot = obstack_alloc (&objfile->objfile_obstack,
offsetof (struct demangled_name_entry,
demangled)
+ lookup_len + demangled_len + 2);
(*slot)->mangled = &((*slot)->demangled[demangled_len + 1]);
strcpy ((*slot)->mangled, lookup_name);
}
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, objfile);
else
symbol_set_demangled_name (gsymbol, NULL, objfile);
}
/* 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:
if (symbol_get_demangled_name (gsymbol) != NULL)
return symbol_get_demangled_name (gsymbol);
else
return ada_decode_symbol (gsymbol);
break;
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 = symbol_get_demangled_name (gsymbol);
if (dem_name == NULL)
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)
{
sal->pspace = NULL;
sal->symtab = 0;
sal->section = 0;
sal->line = 0;
sal->pc = 0;
sal->end = 0;
sal->explicit_pc = 0;
sal->explicit_line = 0;
sal->probe = NULL;
}
/* 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;
}
struct symtab *
find_pc_sect_symtab_via_partial (CORE_ADDR pc, struct obj_section *section)
{
struct objfile *objfile;
struct 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
&& (MSYMBOL_TYPE (msymbol) == mst_data
|| MSYMBOL_TYPE (msymbol) == mst_bss
|| MSYMBOL_TYPE (msymbol) == mst_abs
|| MSYMBOL_TYPE (msymbol) == mst_file_data
|| MSYMBOL_TYPE (msymbol) == mst_file_bss))
return NULL;
ALL_OBJFILES (objfile)
{
struct symtab *result = NULL;
if (objfile->sf)
result = objfile->sf->qf->find_pc_sect_symtab (objfile, msymbol,
pc, section, 0);
if (result)
return result;
}
return NULL;
}
/* 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->obj_section = SYMBOL_OBJ_SECTION (msym);
ginfo->section = SYMBOL_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;
ALL_OBJFILE_OSECTIONS (objfile, s)
{
int idx = s->the_bfd_section->index;
CORE_ADDR offset = ANOFFSET (objfile->section_offsets, idx);
if (obj_section_addr (s) - offset <= addr
&& addr < obj_section_endaddr (s) - offset)
{
ginfo->obj_section = s;
ginfo->section = idx;
return;
}
}
}
}
struct symbol *
fixup_symbol_section (struct symbol *sym, struct objfile *objfile)
{
CORE_ADDR addr;
if (!sym)
return NULL;
if (SYMBOL_OBJ_SECTION (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_SYMTAB (sym)->objfile;
/* 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 = cplus_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 = cplus_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;
}
/* Find the definition for a specified symbol name NAME
in domain DOMAIN, visible from lexical block BLOCK.
Returns the struct symbol pointer, or zero if no symbol is found.
C++: if IS_A_FIELD_OF_THIS is nonzero on entry, check to see if
NAME is a field of the current implied argument `this'. If so set
*IS_A_FIELD_OF_THIS to 1, otherwise set it to zero.
BLOCK_FOUND is set to the block in which NAME is found (in the case of
a field of `this', value_of_this sets BLOCK_FOUND to the proper value.) */
/* 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 symbol *
lookup_symbol_in_language (const char *name, const struct block *block,
const domain_enum domain, enum language lang,
int *is_a_field_of_this)
{
const char *modified_name;
struct 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;
}
/* Behave like lookup_symbol_in_language, but performed with the
current language. */
struct symbol *
lookup_symbol (const char *name, const struct block *block,
domain_enum domain, int *is_a_field_of_this)
{
return lookup_symbol_in_language (name, block, domain,
current_language->la_language,
is_a_field_of_this);
}
/* Look up the `this' symbol for LANG in BLOCK. Return the symbol if
found, or NULL if not found. */
struct symbol *
lookup_language_this (const struct language_defn *lang,
const struct block *block)
{
if (lang->la_name_of_this == NULL || block == NULL)
return NULL;
while (block)
{
struct symbol *sym;
sym = lookup_block_symbol (block, lang->la_name_of_this, VAR_DOMAIN);
if (sym != NULL)
{
block_found = block;
return sym;
}
if (BLOCK_FUNCTION (block))
break;
block = BLOCK_SUPERBLOCK (block);
}
return NULL;
}
/* 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 symbol *
lookup_symbol_aux (const char *name, const struct block *block,
const domain_enum domain, enum language language,
int *is_a_field_of_this)
{
struct symbol *sym;
const struct language_defn *langdef;
/* 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 and expect it to be either 0 or 1.
If we don't set it, the contents of is_a_field_of_this are
undefined. */
if (is_a_field_of_this != NULL)
*is_a_field_of_this = 0;
/* Search specified block and its superiors. Don't search
STATIC_BLOCK or GLOBAL_BLOCK. */
sym = lookup_symbol_aux_local (name, block, domain, language);
if (sym != NULL)
return sym;
/* 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);
if (is_a_field_of_this != NULL)
{
struct symbol *sym = lookup_language_this (langdef, block);
if (sym)
{
struct type *t = sym->type;
/* I'm not really sure that type of this can ever
be typedefed; just be safe. */
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 = 1;
return NULL;
}
}
}
/* Now do whatever is appropriate for LANGUAGE to look
up static and global variables. */
sym = langdef->la_lookup_symbol_nonlocal (name, block, domain);
if (sym != NULL)
return sym;
/* Now search all static file-level symbols. Not strictly correct,
but more useful than an error. */
return lookup_static_symbol_aux (name, domain);
}
/* Search all static file-level symbols for NAME from DOMAIN. Do the symtabs
first, then check the psymtabs. 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. */
struct symbol *
lookup_static_symbol_aux (const char *name, const domain_enum domain)
{
struct objfile *objfile;
struct symbol *sym;
sym = lookup_symbol_aux_symtabs (STATIC_BLOCK, name, domain);
if (sym != NULL)
return sym;
ALL_OBJFILES (objfile)
{
sym = lookup_symbol_aux_quick (objfile, STATIC_BLOCK, name, domain);
if (sym != NULL)
return sym;
}
return NULL;
}
/* Check to see if the symbol is defined in BLOCK or its superiors.
Don't search STATIC_BLOCK or GLOBAL_BLOCK. */
static struct symbol *
lookup_symbol_aux_local (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 NULL;
while (block != static_block)
{
sym = lookup_symbol_aux_block (name, block, domain);
if (sym != NULL)
return sym;
if (language == language_cplus || language == language_fortran)
{
sym = cp_lookup_symbol_imports_or_template (scope, name, block,
domain);
if (sym != NULL)
return sym;
}
if (BLOCK_FUNCTION (block) != NULL && block_inlined_p (block))
break;
block = BLOCK_SUPERBLOCK (block);
}
/* We've reached the edge of the function without finding a result. */
return NULL;
}
/* Look up OBJFILE to BLOCK. */
struct objfile *
lookup_objfile_from_block (const struct block *block)
{
struct objfile *obj;
struct symtab *s;
if (block == NULL)
return NULL;
block = block_global_block (block);
/* Go through SYMTABS. */
ALL_SYMTABS (obj, s)
if (block == BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), GLOBAL_BLOCK))
{
if (obj->separate_debug_objfile_backlink)
obj = obj->separate_debug_objfile_backlink;
return obj;
}
return NULL;
}
/* Look up a symbol in a block; if found, fixup the symbol, and set
block_found appropriately. */
struct symbol *
lookup_symbol_aux_block (const char *name, const struct block *block,
const domain_enum domain)
{
struct symbol *sym;
sym = lookup_block_symbol (block, name, domain);
if (sym)
{
block_found = block;
return fixup_symbol_section (sym, NULL);
}
return NULL;
}
/* Check all global symbols in OBJFILE in symtabs and
psymtabs. */
struct symbol *
lookup_global_symbol_from_objfile (const struct objfile *main_objfile,
const char *name,
const domain_enum domain)
{
const struct objfile *objfile;
struct symbol *sym;
struct blockvector *bv;
const struct block *block;
struct symtab *s;
for (objfile = main_objfile;
objfile;
objfile = objfile_separate_debug_iterate (main_objfile, objfile))
{
/* Go through symtabs. */
ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
{
bv = BLOCKVECTOR (s);
block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
sym = lookup_block_symbol (block, name, domain);
if (sym)
{
block_found = block;
return fixup_symbol_section (sym, (struct objfile *)objfile);
}
}
sym = lookup_symbol_aux_quick ((struct objfile *) objfile, GLOBAL_BLOCK,
name, domain);
if (sym)
return sym;
}
return 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 symbol *
lookup_symbol_aux_objfile (struct objfile *objfile, int block_index,
const char *name, const domain_enum domain)
{
struct symbol *sym = NULL;
struct blockvector *bv;
const struct block *block;
struct symtab *s;
if (objfile->sf)
objfile->sf->qf->pre_expand_symtabs_matching (objfile, block_index,
name, domain);
ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
{
bv = BLOCKVECTOR (s);
block = BLOCKVECTOR_BLOCK (bv, block_index);
sym = lookup_block_symbol (block, name, domain);
if (sym)
{
block_found = block;
return fixup_symbol_section (sym, objfile);
}
}
return NULL;
}
/* Same as lookup_symbol_aux_objfile, except that it searches all
objfiles. Return the first match found. */
static struct symbol *
lookup_symbol_aux_symtabs (int block_index, const char *name,
const domain_enum domain)
{
struct symbol *sym;
struct objfile *objfile;
ALL_OBJFILES (objfile)
{
sym = lookup_symbol_aux_objfile (objfile, block_index, name, domain);
if (sym)
return sym;
}
return NULL;
}
/* Wrapper around lookup_symbol_aux_objfile for search_symbols.
Look up LINKAGE_NAME in DOMAIN in the global and static blocks of OBJFILE
and all related objfiles. */
static struct 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 symbol *sym;
sym = lookup_symbol_aux_objfile (cur_objfile, GLOBAL_BLOCK,
modified_name, domain);
if (sym == NULL)
sym = lookup_symbol_aux_objfile (cur_objfile, STATIC_BLOCK,
modified_name, domain);
if (sym != NULL)
{
do_cleanups (cleanup);
return sym;
}
}
do_cleanups (cleanup);
return NULL;
}
/* A helper function for lookup_symbol_aux that interfaces with the
"quick" symbol table functions. */
static struct symbol *
lookup_symbol_aux_quick (struct objfile *objfile, int kind,
const char *name, const domain_enum domain)
{
struct symtab *symtab;
struct blockvector *bv;
const struct block *block;
struct symbol *sym;
if (!objfile->sf)
return NULL;
symtab = objfile->sf->qf->lookup_symbol (objfile, kind, name, domain);
if (!symtab)
return NULL;
bv = BLOCKVECTOR (symtab);
block = BLOCKVECTOR_BLOCK (bv, kind);
sym = lookup_block_symbol (block, name, domain);
if (!sym)
{
/* This shouldn't be necessary, but as a last resort try
looking in the statics even though the psymtab claimed
the symbol was global, or vice-versa. It's possible
that the psymtab gets it wrong in some cases. */
/* FIXME: carlton/2002-09-30: Should we really do that?
If that happens, isn't it likely to be a GDB error, in
which case we should fix the GDB error rather than
silently dealing with it here? So I'd vote for
removing the check for the symbol in the other
block. */
block = BLOCKVECTOR_BLOCK (bv,
kind == GLOBAL_BLOCK ?
STATIC_BLOCK : GLOBAL_BLOCK);
sym = lookup_block_symbol (block, name, domain);
if (!sym)
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>)."),
kind == GLOBAL_BLOCK ? "global" : "static",
name, symtab->filename, name, name);
}
return fixup_symbol_section (sym, objfile);
}
/* A default version of lookup_symbol_nonlocal for use by languages
that can't think of anything better to do. This implements the C
lookup rules. */
struct symbol *
basic_lookup_symbol_nonlocal (const char *name,
const struct block *block,
const domain_enum domain)
{
struct symbol *sym;
/* 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_symbol_aux_symtabs 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. */
sym = lookup_symbol_static (name, block, domain);
if (sym != NULL)
return sym;
return lookup_symbol_global (name, block, domain);
}
/* Lookup a symbol in the static block associated to BLOCK, if there
is one; do nothing if BLOCK is NULL or a global block. */
struct symbol *
lookup_symbol_static (const char *name,
const struct block *block,
const domain_enum domain)
{
const struct block *static_block = block_static_block (block);
if (static_block != NULL)
return lookup_symbol_aux_block (name, static_block, domain);
else
return 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 before the search is started. */
struct 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 == NULL);
data->result = lookup_symbol_aux_objfile (objfile, GLOBAL_BLOCK,
data->name, data->domain);
if (data->result == NULL)
data->result = lookup_symbol_aux_quick (objfile, GLOBAL_BLOCK,
data->name, data->domain);
/* If we found a match, tell the iterator to stop. Otherwise,
keep going. */
return (data->result != NULL);
}
/* Lookup a symbol in all files' global blocks (searching psymtabs if
necessary). */
struct symbol *
lookup_symbol_global (const char *name,
const struct block *block,
const domain_enum domain)
{
struct symbol *sym = NULL;
struct objfile *objfile = NULL;
struct global_sym_lookup_data lookup_data;
/* Call library-specific lookup procedure. */
objfile = lookup_objfile_from_block (block);
if (objfile != NULL)
sym = solib_global_lookup (objfile, name, domain);
if (sym != NULL)
return sym;
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);
return lookup_data.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);
}
/* Look up a type named NAME in the struct_domain. The type returned
must not be opaque -- i.e., must have at least one field
defined. */
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 kind,
const char *name)
{
struct symtab *symtab;
struct blockvector *bv;
struct block *block;
struct symbol *sym;
if (!objfile->sf)
return NULL;
symtab = objfile->sf->qf->lookup_symbol (objfile, kind, name, STRUCT_DOMAIN);
if (!symtab)
return NULL;
bv = BLOCKVECTOR (symtab);
block = BLOCKVECTOR_BLOCK (bv, kind);
sym = lookup_block_symbol (block, name, STRUCT_DOMAIN);
if (!sym)
{
int other_kind = kind == GLOBAL_BLOCK ? STATIC_BLOCK : GLOBAL_BLOCK;
/* This shouldn't be necessary, but as a last resort
* try looking in the 'other kind' even though the psymtab
* claimed the symbol was one thing. It's possible that
* the psymtab gets it wrong in some cases.
*/
block = BLOCKVECTOR_BLOCK (bv, other_kind);
sym = lookup_block_symbol (block, name, STRUCT_DOMAIN);
if (!sym)
/* FIXME; error is wrong in one case. */
error (_("\
Internal: global 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>)."),
name, symtab->filename, name, name);
}
if (!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 at file-static or
global blocks. */
struct type *
basic_lookup_transparent_type (const char *name)
{
struct symbol *sym;
struct symtab *s = NULL;
struct blockvector *bv;
struct objfile *objfile;
struct block *block;
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)
{
if (objfile->sf)
objfile->sf->qf->pre_expand_symtabs_matching (objfile,
GLOBAL_BLOCK,
name, STRUCT_DOMAIN);
ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
{
bv = BLOCKVECTOR (s);
block = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
sym = lookup_block_symbol (block, name, STRUCT_DOMAIN);
if (sym && !TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
{
return SYMBOL_TYPE (sym);
}
}
}
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)
{
if (objfile->sf)
objfile->sf->qf->pre_expand_symtabs_matching (objfile, STATIC_BLOCK,
name, STRUCT_DOMAIN);
ALL_OBJFILE_PRIMARY_SYMTABS (objfile, s)
{
bv = BLOCKVECTOR (s);
block = BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK);
sym = lookup_block_symbol (block, name, STRUCT_DOMAIN);
if (sym && !TYPE_IS_OPAQUE (SYMBOL_TYPE (sym)))
{
return SYMBOL_TYPE (sym);
}
}
}
ALL_OBJFILES (objfile)
{
t = basic_lookup_transparent_type_quick (objfile, STATIC_BLOCK, name);
if (t)
return t;
}
return (struct type *) 0;
}
/* Find the name of the file containing main(). */
/* FIXME: What about languages without main() or specially linked
executables that have no main() ? */
const char *
find_main_filename (void)
{
struct objfile *objfile;
char *name = main_name ();
ALL_OBJFILES (objfile)
{
const char *result;
if (!objfile->sf)
continue;
result = objfile->sf->qf->find_symbol_file (objfile, name);
if (result)
return result;
}
return (NULL);
}
/* Search BLOCK for symbol NAME in DOMAIN.
Note that if NAME is the demangled form of a C++ symbol, we will fail
to find a match during the binary search of the non-encoded names, but
for now we don't worry about the slight inefficiency of looking for
a match we'll never find, since it will go pretty quick. Once the
binary search terminates, we drop through and do a straight linear
search on the symbols. Each symbol which is marked as being a ObjC/C++
symbol (language_cplus or language_objc set) has both the encoded and
non-encoded names tested for a match. */
struct symbol *
lookup_block_symbol (const struct block *block, const char *name,
const domain_enum domain)
{
struct block_iterator iter;
struct symbol *sym;
if (!BLOCK_FUNCTION (block))
{
for (sym = block_iter_name_first (block, name, &iter);
sym != NULL;
sym = block_iter_name_next (name, &iter))
{
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
SYMBOL_DOMAIN (sym), domain))
return sym;
}
return NULL;
}
else
{
/* Note that parameter symbols do not always show up last in the
list; this loop makes sure to take anything else other than
parameter symbols first; it only uses parameter symbols as a
last resort. Note that this only takes up extra computation
time on a match. */
struct symbol *sym_found = NULL;
for (sym = block_iter_name_first (block, name, &iter);
sym != NULL;
sym = block_iter_name_next (name, &iter))
{
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
SYMBOL_DOMAIN (sym), domain))
{
sym_found = sym;
if (!SYMBOL_IS_ARGUMENT (sym))
{
break;
}
}
}
return (sym_found); /* Will be NULL if not found. */
}
}
/* Iterate over the symbols named NAME, matching DOMAIN, starting with
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. This function iterates upward through blocks.
When the outermost block has been finished, the function
returns. */
void
iterate_over_symbols (const struct block *block, const char *name,
const domain_enum domain,
symbol_found_callback_ftype *callback,
void *data)
{
while (block)
{
struct block_iterator iter;
struct symbol *sym;
for (sym = block_iter_name_first (block, name, &iter);
sym != NULL;
sym = block_iter_name_next (name, &iter))
{
if (symbol_matches_domain (SYMBOL_LANGUAGE (sym),
SYMBOL_DOMAIN (sym), domain))
{
if (!callback (sym, data))
return;
}
}
block = BLOCK_SUPERBLOCK (block);
}
}
/* Find the symtab associated with PC and SECTION. Look through the
psymtabs and read in another symtab if necessary. */
struct symtab *
find_pc_sect_symtab (CORE_ADDR pc, struct obj_section *section)
{
struct block *b;
struct blockvector *bv;
struct symtab *s = NULL;
struct symtab *best_s = NULL;
struct objfile *objfile;
struct program_space *pspace;
CORE_ADDR distance = 0;
struct minimal_symbol *msymbol;
pspace = current_program_space;
/* 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
&& (MSYMBOL_TYPE (msymbol) == mst_data
|| MSYMBOL_TYPE (msymbol) == mst_bss
|| MSYMBOL_TYPE (msymbol) == mst_abs
|| MSYMBOL_TYPE (msymbol) == mst_file_data
|| MSYMBOL_TYPE (msymbol) == 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
gets its own symtab. The symtab for the included file should have
been read in already via the dependency mechanism.
It might be swifter to create several symtabs with the same name
like xcoff does (I'm not sure).
It also happens for objfiles that have their functions reordered.
For these, the symtab we are looking for is not necessarily read in. */
ALL_PRIMARY_SYMTABS (objfile, s)
{
bv = BLOCKVECTOR (s);
b = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
if (BLOCK_START (b) <= pc
&& BLOCK_END (b) > pc
&& (distance == 0
|| BLOCK_END (b) - BLOCK_START (b) < distance))
{
/* For an objfile that has its functions reordered,
find_pc_psymtab will find the proper partial symbol table
and we simply return its corresponding symtab. */
/* In order to better support objfiles that contain both
stabs and coff debugging info, we continue on if a psymtab
can't be found. */
if ((objfile->flags & OBJF_REORDERED) && objfile->sf)
{
struct symtab *result;
result
= objfile->sf->qf->find_pc_sect_symtab (objfile,
msymbol,
pc, section,
0);
if (result)
return result;
}
if (section != 0)
{
struct block_iterator iter;
struct symbol *sym = NULL;
ALL_BLOCK_SYMBOLS (b, iter, sym)
{
fixup_symbol_section (sym, objfile);
if (matching_obj_sections (SYMBOL_OBJ_SECTION (sym), section))
break;
}
if (sym == NULL)
continue; /* No symbol in this symtab matches
section. */
}
distance = BLOCK_END (b) - BLOCK_START (b);
best_s = s;
}
}
if (best_s != NULL)
return (best_s);
ALL_OBJFILES (objfile)
{
struct symtab *result;
if (!objfile->sf)
continue;
result = objfile->sf->qf->find_pc_sect_symtab (objfile,
msymbol,
pc, section,
1);
if (result)
return result;
}
return NULL;
}
/* Find the symtab associated with PC. Look through the psymtabs and read
in another symtab if necessary. Backward compatibility, no section. */
struct symtab *
find_pc_symtab (CORE_ADDR pc)
{
return find_pc_sect_symtab (pc, find_pc_mapped_section (pc));
}
/* Find the source file and line number for a given PC value and SECTION.
Return a structure containing a symtab pointer, a line number,
and a pc range for the entire source line.
The value's .pc field is NOT the specified pc.
NOTCURRENT nonzero means, if specified pc is on a line boundary,
use the line that ends there. Otherwise, in that case, the line
that begins there is used. */
/* The big complication here is that a line may start in one file, and end just
before the start of another file. This usually occurs when you #include
code in the middle of a subroutine. To properly find the end of a line's PC
range, we must search all symtabs associated with this compilation unit, and
find the one whose first PC is closer than that of the next line in this
symtab. */
/* If it's worth the effort, we could be using a binary search. */
struct symtab_and_line
find_pc_sect_line (CORE_ADDR pc, struct obj_section *section, int notcurrent)
{
struct symtab *s;
struct linetable *l;
int len;
int i;
struct linetable_entry *item;
struct symtab_and_line val;
struct blockvector *bv;
struct minimal_symbol *msymbol;
struct minimal_symbol *mfunsym;
struct objfile *objfile;
/* Info on best line seen so far, and where it starts, and its file. */
struct linetable_entry *best = NULL;
CORE_ADDR best_end = 0;
struct symtab *best_symtab = 0;
/* Store here the first line number
of a file which contains the line at the smallest pc after PC.
If we don't find a line whose range contains PC,
we will use a line one less than this,
with a range from the start of that file to the first line's pc. */
struct linetable_entry *alt = NULL;
struct symtab *alt_symtab = 0;
/* Info on best line seen in this file. */
struct linetable_entry *prev;
/* If this pc is not from the current frame,
it is the address of the end of a call instruction.
Quite likely that is the start of the following statement.
But what we want is the statement containing the instruction.
Fudge the pc to make sure we get that. */
init_sal (&val); /* initialize to zeroes */
val.pspace = current_program_space;
/* It's tempting to assume that, if we can't find debugging info for
any function enclosing PC, that we shouldn't search for line
number info, either. However, GAS can emit line number info for
assembly files --- very helpful when debugging hand-written
assembly code. In such a case, we'd have no debug info for the
function, but we would have line info. */
if (notcurrent)
pc -= 1;
/* elz: added this because this function returned the wrong
information if the pc belongs to a stub (import/export)
to call a shlib function. This stub would be anywhere between
two functions in the target, and the line info was erroneously
taken to be the one of the line before the pc. */
/* RT: Further explanation:
* We have stubs (trampolines) inserted between procedures.
*
* Example: "shr1" exists in a shared library, and a "shr1" stub also
* exists in the main image.
*
* In the minimal symbol table, we have a bunch of symbols
* sorted by start address. The stubs are marked as "trampoline",
* the others appear as text. E.g.:
*
* Minimal symbol table for main image
* main: code for main (text symbol)
* shr1: stub (trampoline symbol)
* foo: code for foo (text symbol)
* ...
* Minimal symbol table for "shr1" image:
* ...
* shr1: code for shr1 (text symbol)
* ...
*
* So the code below is trying to detect if we are in the stub
* ("shr1" stub), and if so, find the real code ("shr1" trampoline),
* and if found, do the symbolization from the real-code address
* rather than the stub address.
*
* Assumptions being made about the minimal symbol table:
* 1. lookup_minimal_symbol_by_pc() will return a trampoline only
* if we're really in the trampoline.s If we're beyond it (say
* we're in "foo" in the above example), it'll have a closer
* symbol (the "foo" text symbol for example) and will not
* return the trampoline.
* 2. lookup_minimal_symbol_text() will find a real text symbol
* corresponding to the trampoline, and whose address will
* be different than the trampoline address. I put in a sanity
* check for the address being the same, to avoid an
* infinite recursion.
*/
msymbol = lookup_minimal_symbol_by_pc (pc);
if (msymbol != NULL)
if (MSYMBOL_TYPE (msymbol) == mst_solib_trampoline)
{
mfunsym = lookup_minimal_symbol_text (SYMBOL_LINKAGE_NAME (msymbol),
NULL);
if (mfunsym == NULL)
/* I eliminated this warning since it is coming out
* in the following situation:
* gdb shmain // test program with shared libraries
* (gdb) break shr1 // function in shared lib
* Warning: In stub for ...
* In the above situation, the shared lib is not loaded yet,
* so of course we can't find the real func/line info,
* but the "break" still works, and the warning is annoying.
* So I commented out the warning. RT */
/* warning ("In stub for %s; unable to find real function/line info",
SYMBOL_LINKAGE_NAME (msymbol)); */
;
/* fall through */
else if (SYMBOL_VALUE_ADDRESS (mfunsym)
== SYMBOL_VALUE_ADDRESS (msymbol))
/* Avoid infinite recursion */
/* See above comment about why warning is commented out. */
/* warning ("In stub for %s; unable to find real function/line info",
SYMBOL_LINKAGE_NAME (msymbol)); */
;
/* fall through */
else
return find_pc_line (SYMBOL_VALUE_ADDRESS (mfunsym), 0);
}
s = find_pc_sect_symtab (pc, section);
if (!s)
{
/* If no symbol information, return previous pc. */
if (notcurrent)
pc++;
val.pc = pc;
return val;
}
bv = BLOCKVECTOR (s);
objfile = s->objfile;
/* Look at all the symtabs that share this blockvector.
They all have the same apriori range, that we found was right;
but they have different line tables. */
ALL_OBJFILE_SYMTABS (objfile, s)
{
if (BLOCKVECTOR (s) != bv)
continue;
/* Find the best line in this symtab. */
l = LINETABLE (s);
if (!l)
continue;
len = l->nitems;
if (len <= 0)
{
/* I think len can be zero if the symtab lacks line numbers
(e.g. gcc -g1). (Either that or the LINETABLE is NULL;
I'm not sure which, and maybe it depends on the symbol
reader). */
continue;
}
prev = NULL;
item = l->item; /* Get first line info. */
/* Is this file's first line closer than the first lines of other files?
If so, record this file, and its first line, as best alternate. */
if (item->pc > pc && (!alt || item->pc < alt->pc))
{
alt = item;
alt_symtab = s;
}
for (i = 0; i < len; i++, item++)
{
/* Leave prev pointing to the linetable entry for the last line
that started at or before PC. */
if (item->pc > pc)
break;
prev = item;
}
/* At this point, prev points at the line whose start addr is <= pc, and
item points at the next line. If we ran off the end of the linetable
(pc >= start of the last line), then prev == item. If pc < start of
the first line, prev will not be set. */
/* Is this file's best line closer than the best in the other files?
If so, record this file, and its best line, as best so far. Don't
save prev if it represents the end of a function (i.e. line number
0) instead of a real line. */
if (prev && prev->line && (!best || prev->pc > best->pc))
{
best = prev;
best_symtab = s;
/* Discard BEST_END if it's before the PC of the current BEST. */
if (best_end <= best->pc)
best_end = 0;
}
/* If another line (denoted by ITEM) is in the linetable and its
PC is after BEST's PC, but before the current BEST_END, then
use ITEM's PC as the new best_end. */
if (best && i < len && item->pc > best->pc
&& (best_end == 0 || best_end > item->pc))
best_end = item->pc;
}
if (!best_symtab)
{
/* If we didn't find any line number info, just return zeros.
We used to return alt->line - 1 here, but that could be
anywhere; if we don't have line number info for this PC,
don't make some up. */
val.pc = pc;
}
else if (best->line == 0)
{
/* If our best fit is in a range of PC's for which no line
number info is available (line number is zero) then we didn't
find any valid line information. */
val.pc = pc;
}
else
{
val.symtab = best_symtab;
val.line = best->line;
val.pc = best->pc;
if (best_end && (!alt || best_end < alt->pc))
val.end = best_end;
else if (alt)
val.end = alt->pc;
else
val.end = BLOCK_END (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK));
}
val.section = section;
return val;
}
/* Backward compatibility (no section). */
struct symtab_and_line
find_pc_line (CORE_ADDR pc, int notcurrent)
{
struct obj_section *section;
section = find_pc_overlay (pc);
if (pc_in_unmapped_range (pc, section))
pc = overlay_mapped_address (pc, section);
return find_pc_sect_line (pc, section, notcurrent);
}
/* Find line number LINE in any symtab whose name is the same as
SYMTAB.
If found, return the symtab that contains the linetable in which it was
found, set *INDEX to the index in the linetable of the best entry
found, and set *EXACT_MATCH nonzero if the value returned is an
exact match.
If not found, return NULL. */
struct symtab *
find_line_symtab (struct symtab *symtab, int line,
int *index, int *exact_match)
{
int exact = 0; /* Initialized here to avoid a compiler warning. */
/* BEST_INDEX and BEST_LINETABLE identify the smallest linenumber > LINE
so far seen. */
int best_index;
struct linetable *best_linetable;
struct symtab *best_symtab;
/* First try looking it up in the given symtab. */
best_linetable = LINETABLE (symtab);
best_symtab = symtab;
best_index = find_line_common (best_linetable, line, &exact, 0);
if (best_index < 0 || !exact)
{
/* Didn't find an exact match. So we better keep looking for
another symtab with the same name. In the case of xcoff,
multiple csects for one source file (produced by IBM's FORTRAN
compiler) produce multiple symtabs (this is unavoidable
assuming csects can be at arbitrary places in memory and that
the GLOBAL_BLOCK of a symtab has a begin and end address). */
/* BEST is the smallest linenumber > LINE so far seen,
or 0 if none has been seen so far.
BEST_INDEX and BEST_LINETABLE identify the item for it. */
int best;
struct objfile *objfile;
struct symtab *s;
if (best_index >= 0)
best = best_linetable->item[best_index].line;
else
best = 0;
ALL_OBJFILES (objfile)
{
if (objfile->sf)
objfile->sf->qf->expand_symtabs_with_filename (objfile,
symtab->filename);
}
/* Get symbol full file name if possible. */
symtab_to_fullname (symtab);
ALL_SYMTABS (objfile, s)
{
struct linetable *l;
int ind;
if (FILENAME_CMP (symtab->filename, s->filename) != 0)
continue;
if (symtab->fullname != NULL
&& symtab_to_fullname (s) != NULL
&& FILENAME_CMP (symtab->fullname, s->fullname) != 0)
continue;
l = LINETABLE (s);
ind = find_line_common (l, line, &exact, 0);
if (ind >= 0)
{
if (exact)
{
best_index = ind;
best_linetable = l;
best_symtab = s;
goto done;
}
if (best == 0 || l->item[ind].line < best)
{
best = l->item[ind].line;
best_index = ind;
best_linetable = l;
best_symtab = s;
}
}
}
}
done:
if (best_index < 0)
return NULL;
if (index)
*index = best_index;
if (exact_match)
*exact_match = exact;
return best_symtab;
}
/* Given SYMTAB, returns all the PCs function in the symtab that
exactly match LINE. Returns NULL if there are no exact matches,
but updates BEST_ITEM in this case. */
VEC (CORE_ADDR) *
find_pcs_for_symtab_line (struct symtab *symtab, int line,
struct linetable_entry **best_item)
{
int start = 0, ix;
struct symbol *previous_function = NULL;
VEC (CORE_ADDR) *result = NULL;
/* First, collect all the PCs that are at this line. */
while (1)
{
int was_exact;
int idx;
idx = find_line_common (LINETABLE (symtab), line, &was_exact, start);
if (idx < 0)
break;
if (!was_exact)
{
struct linetable_entry *item = &LINETABLE (symtab)->item[idx];
if (*best_item == NULL || item->line < (*best_item)->line)
*best_item = item;
break;
}
VEC_safe_push (CORE_ADDR, result, LINETABLE (symtab)->item[idx].pc);
start = idx + 1;
}
return result;
}
/* Set the PC value for a given source file and line number and return true.
Returns zero for invalid line number (and sets the PC to 0).
The source file is specified with a struct symtab. */
int
find_line_pc (struct symtab *symtab, int line, CORE_ADDR *pc)
{
struct linetable *l;
int ind;
*pc = 0;
if (symtab == 0)
return 0;
symtab = find_line_symtab (symtab, line, &ind, NULL);
if (symtab != NULL)
{
l = LINETABLE (symtab);
*pc = l->item[ind].pc;
return 1;
}
else
return 0;
}
/* Find the range of pc values in a line.
Store the starting pc of the line into *STARTPTR
and the ending pc (start of next line) into *ENDPTR.
Returns 1 to indicate success.
Returns 0 if could not find the specified line. */
int
find_line_pc_range (struct symtab_and_line sal, CORE_ADDR *startptr,
CORE_ADDR *endptr)
{
CORE_ADDR startaddr;
struct symtab_and_line found_sal;
startaddr = sal.pc;
if (startaddr == 0 && !find_line_pc (sal.symtab, sal.line, &startaddr))
return 0;
/* This whole function is based on address. For example, if line 10 has
two parts, one from 0x100 to 0x200 and one from 0x300 to 0x400, then
"info line *0x123" should say the line goes from 0x100 to 0x200
and "info line *0x355" should say the line goes from 0x300 to 0x400.
This also insures that we never give a range like "starts at 0x134
and ends at 0x12c". */
found_sal = find_pc_sect_line (startaddr, sal.section, 0);
if (found_sal.line != sal.line)
{
/* The specified line (sal) has zero bytes. */
*startptr = found_sal.pc;
*endptr = found_sal.pc;
}
else
{
*startptr = found_sal.pc;
*endptr = found_sal.end;
}
return 1;
}
/* Given a line table and a line number, return the index into the line
table for the pc of the nearest line whose number is >= the specified one.
Return -1 if none is found. The value is >= 0 if it is an index.
START is the index at which to start searching the line table.
Set *EXACT_MATCH nonzero if the value returned is an exact match. */
static int
find_line_common (struct linetable *l, int lineno,
int *exact_match, int start)
{
int i;
int len;
/* BEST is the smallest linenumber > LINENO so far seen,
or 0 if none has been seen so far.
BEST_INDEX identifies the item for it. */
int best_index = -1;
int best = 0;
*exact_match = 0;
if (lineno <= 0)
return -1;
if (l == 0)
return -1;
len = l->nitems;
for (i = start; i < len; i++)
{
struct linetable_entry *item = &(l->item[i]);
if (item->line == lineno)
{
/* Return the first (lowest address) entry which matches. */
*exact_match = 1;
return i;
}
if (item->line > lineno && (best == 0 || item->line < best))
{
best = item->line;
best_index = i;
}
}
/* If we got here, we didn't get an exact match. */
return best_index;
}
int
find_pc_line_pc_range (CORE_ADDR pc, CORE_ADDR *startptr, CORE_ADDR *endptr)
{
struct symtab_and_line sal;
sal = find_pc_line (pc, 0);
*startptr = sal.pc;
*endptr = sal.end;
return sal.symtab != 0;
}
/* Given a function start address FUNC_ADDR and SYMTAB, find the first
address for that function that has an entry in SYMTAB's line info
table. If such an entry cannot be found, return FUNC_ADDR
unaltered. */
static CORE_ADDR
skip_prologue_using_lineinfo (CORE_ADDR func_addr, struct symtab *symtab)
{
CORE_ADDR func_start, func_end;
struct linetable *l;
int i;
/* Give up if this symbol has no lineinfo table. */
l = LINETABLE (symtab);
if (l == NULL)
return func_addr;
/* Get the range for the function's PC values, or give up if we
cannot, for some reason. */
if (!find_pc_partial_function (func_addr, NULL, &func_start, &func_end))
return func_addr;
/* Linetable entries are ordered by PC values, see the commentary in
symtab.h where `struct linetable' is defined. Thus, the first
entry whose PC is in the range [FUNC_START..FUNC_END[ is the
address we are looking for. */
for (i = 0; i < l->nitems; i++)
{
struct linetable_entry *item = &(l->item[i]);
/* Don't use line numbers of zero, they mark special entries in
the table. See the commentary on symtab.h before the
definition of struct linetable. */
if (item->line > 0 && func_start <= item->pc && item->pc < func_end)
return item->pc;
}
return func_addr;
}
/* Given a function symbol SYM, find the symtab and line for the start
of the function.
If the argument FUNFIRSTLINE is nonzero, we want the first line
of real code inside the function. */
struct symtab_and_line
find_function_start_sal (struct symbol *sym, int funfirstline)
{
struct symtab_and_line sal;
fixup_symbol_section (sym, NULL);
sal = find_pc_sect_line (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)),
SYMBOL_OBJ_SECTION (sym), 0);
/* We always should have a line for the function start address.
If we don't, something is odd. Create a plain SAL refering
just the PC and hope that skip_prologue_sal (if requested)
can find a line number for after the prologue. */
if (sal.pc < BLOCK_START (SYMBOL_BLOCK_VALUE (sym)))
{
init_sal (&sal);
sal.pspace = current_program_space;
sal.pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
sal.section = SYMBOL_OBJ_SECTION (sym);
}
if (funfirstline)
skip_prologue_sal (&sal);
return sal;
}
/* Adjust SAL to the first instruction past the function prologue.
If the PC was explicitly specified, the SAL is not changed.
If the line number was explicitly specified, at most the SAL's PC
is updated. If SAL is already past the prologue, then do nothing. */
void
skip_prologue_sal (struct symtab_and_line *sal)
{
struct symbol *sym;
struct symtab_and_line start_sal;
struct cleanup *old_chain;
CORE_ADDR pc, saved_pc;
struct obj_section *section;
const char *name;
struct objfile *objfile;
struct gdbarch *gdbarch;
struct block *b, *function_block;
int force_skip, skip;
/* Do not change the SAL is PC was specified explicitly. */
if (sal->explicit_pc)
return;
old_chain = save_current_space_and_thread ();
switch_to_program_space_and_thread (sal->pspace);
sym = find_pc_sect_function (sal->pc, sal->section);
if (sym != NULL)
{
fixup_symbol_section (sym, NULL);
pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
section = SYMBOL_OBJ_SECTION (sym);
name = SYMBOL_LINKAGE_NAME (sym);
objfile = SYMBOL_SYMTAB (sym)->objfile;
}
else
{
struct minimal_symbol *msymbol
= lookup_minimal_symbol_by_pc_section (sal->pc, sal->section);
if (msymbol == NULL)
{
do_cleanups (old_chain);
return;
}
pc = SYMBOL_VALUE_ADDRESS (msymbol);
section = SYMBOL_OBJ_SECTION (msymbol);
name = SYMBOL_LINKAGE_NAME (msymbol);
objfile = msymbol_objfile (msymbol);
}
gdbarch = get_objfile_arch (objfile);
/* Process the prologue in two passes. In the first pass try to skip the
prologue (SKIP is true) and verify there is a real need for it (indicated
by FORCE_SKIP). If no such reason was found run a second pass where the
prologue is not skipped (SKIP is false). */
skip = 1;
force_skip = 1;
/* Be conservative - allow direct PC (without skipping prologue) only if we
have proven the CU (Compilation Unit) supports it. sal->SYMTAB does not
have to be set by the caller so we use SYM instead. */
if (sym && SYMBOL_SYMTAB (sym)->locations_valid)
force_skip = 0;
saved_pc = pc;
do
{
pc = saved_pc;
/* If the function is in an unmapped overlay, use its unmapped LMA address,
so that gdbarch_skip_prologue has something unique to work on. */
if (section_is_overlay (section) && !section_is_mapped (section))
pc = overlay_unmapped_address (pc, section);
/* Skip "first line" of function (which is actually its prologue). */
pc += gdbarch_deprecated_function_start_offset (gdbarch);
if (skip)
pc = gdbarch_skip_prologue (gdbarch, pc);
/* For overlays, map pc back into its mapped VMA range. */
pc = overlay_mapped_address (pc, section);
/* Calculate line number. */
start_sal = find_pc_sect_line (pc, section, 0);
/* Check if gdbarch_skip_prologue left us in mid-line, and the next
line is still part of the same function. */
if (skip && start_sal.pc != pc
&& (sym ? (BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) <= start_sal.end
&& start_sal.end < BLOCK_END (SYMBOL_BLOCK_VALUE (sym)))
: (lookup_minimal_symbol_by_pc_section (start_sal.end, section)
== lookup_minimal_symbol_by_pc_section (pc, section))))
{
/* First pc of next line */
pc = start_sal.end;
/* Recalculate the line number (might not be N+1). */
start_sal = find_pc_sect_line (pc, section, 0);
}
/* On targets with executable formats that don't have a concept of
constructors (ELF with .init has, PE doesn't), gcc emits a call
to `__main' in `main' between the prologue and before user
code. */
if (gdbarch_skip_main_prologue_p (gdbarch)
&& name && strcmp_iw (name, "main") == 0)
{
pc = gdbarch_skip_main_prologue (gdbarch, pc);
/* Recalculate the line number (might not be N+1). */
start_sal = find_pc_sect_line (pc, section, 0);
force_skip = 1;
}
}
while (!force_skip && skip--);
/* If we still don't have a valid source line, try to find the first
PC in the lineinfo table that belongs to the same function. This
happens with COFF debug info, which does not seem to have an
entry in lineinfo table for the code after the prologue which has
no direct relation to source. For example, this was found to be
the case with the DJGPP target using "gcc -gcoff" when the
compiler inserted code after the prologue to make sure the stack
is aligned. */
if (!force_skip && sym && start_sal.symtab == NULL)
{
pc = skip_prologue_using_lineinfo (pc, SYMBOL_SYMTAB (sym));
/* Recalculate the line number. */
start_sal = find_pc_sect_line (pc, section, 0);
}
do_cleanups (old_chain);
/* If we're already past the prologue, leave SAL unchanged. Otherwise
forward SAL to the end of the prologue. */
if (sal->pc >= pc)
return;
sal->pc = pc;
sal->section = section;
/* Unless the explicit_line flag was set, update the SAL line
and symtab to correspond to the modified PC location. */
if (sal->explicit_line)
return;
sal->symtab = start_sal.symtab;
sal->line = start_sal.line;
sal->end = start_sal.end;
/* Check if we are now inside an inlined function. If we can,
use the call site of the function instead. */
b = block_for_pc_sect (sal->pc, sal->section);
function_block = NULL;
while (b != NULL)
{
if (BLOCK_FUNCTION (b) != NULL && block_inlined_p (b))
function_block = b;