/* GDB routines for manipulating the minimal symbol tables.
- Copyright 1992 Free Software Foundation, Inc.
+ Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+ 2002, 2003
+ Free Software Foundation, Inc.
Contributed by Cygnus Support, using pieces from other GDB modules.
-This file is part of GDB.
+ 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 2 of the License, or
-(at your option) any later version.
+ 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 2 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.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
/* This file contains support routines for creating, manipulating, and
In many cases, even if a file was compiled with no special options for
debugging at all, as long as was not stripped it will contain sufficient
information to build useful minimal symbol tables using this structure.
-
+
Even when a file contains enough debugging information to build a full
symbol table, these minimal symbols are still useful for quickly mapping
between names and addresses, and vice versa. They are also sometimes used
#include "defs.h"
+#include <ctype.h>
+#include "gdb_string.h"
#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
+#include "demangle.h"
+#include "value.h"
+#include "cp-abi.h"
/* Accumulate the minimal symbols for each objfile in bunches of BUNCH_SIZE.
At the end, copy them all into one newly allocated location on an objfile's
#define BUNCH_SIZE 127
struct msym_bunch
-{
- struct msym_bunch *next;
- struct minimal_symbol contents[BUNCH_SIZE];
-};
+ {
+ struct msym_bunch *next;
+ struct minimal_symbol contents[BUNCH_SIZE];
+ };
/* Bunch currently being filled up.
The next field points to chain of filled bunches. */
static int msym_count;
-/* Prototypes for local functions. */
+/* Compute a hash code based using the same criteria as `strcmp_iw'. */
-static int
-compare_minimal_symbols PARAMS ((const void *, const void *));
+unsigned int
+msymbol_hash_iw (const char *string)
+{
+ unsigned int hash = 0;
+ while (*string && *string != '(')
+ {
+ while (isspace (*string))
+ ++string;
+ if (*string && *string != '(')
+ {
+ hash = hash * 67 + *string - 113;
+ ++string;
+ }
+ }
+ return hash;
+}
-static int
-compact_minimal_symbols PARAMS ((struct minimal_symbol *, int));
+/* Compute a hash code for a string. */
+
+unsigned int
+msymbol_hash (const char *string)
+{
+ unsigned int hash = 0;
+ for (; *string; ++string)
+ hash = hash * 67 + *string - 113;
+ return hash;
+}
+
+/* Add the minimal symbol SYM to an objfile's minsym hash table, TABLE. */
+void
+add_minsym_to_hash_table (struct minimal_symbol *sym,
+ struct minimal_symbol **table)
+{
+ if (sym->hash_next == NULL)
+ {
+ unsigned int hash
+ = msymbol_hash (SYMBOL_LINKAGE_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE;
+ sym->hash_next = table[hash];
+ table[hash] = sym;
+ }
+}
+
+/* Add the minimal symbol SYM to an objfile's minsym demangled hash table,
+ TABLE. */
+static void
+add_minsym_to_demangled_hash_table (struct minimal_symbol *sym,
+ struct minimal_symbol **table)
+{
+ if (sym->demangled_hash_next == NULL)
+ {
+ unsigned int hash = msymbol_hash_iw (SYMBOL_DEMANGLED_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE;
+ sym->demangled_hash_next = table[hash];
+ table[hash] = sym;
+ }
+}
-/* Look through all the current minimal symbol tables and find the first
- minimal symbol that matches NAME. If OBJF is non-NULL, it specifies a
- particular objfile and the search is limited to that objfile. Returns
- a pointer to the minimal symbol that matches, or NULL if no match is found.
+
+/* Look through all the current minimal symbol tables and find the
+ first minimal symbol that matches NAME. If OBJF is non-NULL, limit
+ the search to that objfile. If SFILE is non-NULL, the only file-scope
+ symbols considered will be from that source file (global symbols are
+ still preferred). Returns a pointer to the minimal symbol that
+ matches, or NULL if no match is found.
Note: One instance where there may be duplicate minimal symbols with
the same name is when the symbol tables for a shared library and the
symbol tables for an executable contain global symbols with the same
- names (the dynamic linker deals with the duplication). */
+ names (the dynamic linker deals with the duplication). */
struct minimal_symbol *
-lookup_minimal_symbol (name, objf)
- register const char *name;
- struct objfile *objf;
+lookup_minimal_symbol (const char *name, const char *sfile,
+ struct objfile *objf)
{
struct objfile *objfile;
struct minimal_symbol *msymbol;
struct minimal_symbol *found_symbol = NULL;
-#ifdef IBM6000_TARGET
+ struct minimal_symbol *found_file_symbol = NULL;
struct minimal_symbol *trampoline_symbol = NULL;
+
+ unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE;
+ unsigned int dem_hash = msymbol_hash_iw (name) % MINIMAL_SYMBOL_HASH_SIZE;
+
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ if (sfile != NULL)
+ {
+ char *p = strrchr (sfile, '/');
+ if (p != NULL)
+ sfile = p + 1;
+ }
#endif
for (objfile = object_files;
objfile != NULL && found_symbol == NULL;
- objfile = objfile -> next)
+ objfile = objfile->next)
{
if (objf == NULL || objf == objfile)
{
- for (msymbol = objfile -> msymbols;
- msymbol != NULL && msymbol -> name != NULL &&
- found_symbol == NULL;
- msymbol++)
+ /* Do two passes: the first over the ordinary hash table,
+ and the second over the demangled hash table. */
+ int pass;
+
+ for (pass = 1; pass <= 2 && found_symbol == NULL; pass++)
{
- if (strcmp (msymbol -> name, name) == 0)
+ /* Select hash list according to pass. */
+ if (pass == 1)
+ msymbol = objfile->msymbol_hash[hash];
+ else
+ msymbol = objfile->msymbol_demangled_hash[dem_hash];
+
+ while (msymbol != NULL && found_symbol == NULL)
{
-#ifdef IBM6000_TARGET
-/* I *think* all platforms using shared libraries (and trampoline code)
- * will suffer this problem. Consider a case where there are 5 shared
- * libraries, each referencing `foo' with a trampoline entry. When someone
- * wants to put a breakpoint on `foo' and the only info we have is minimal
- * symbol vector, we want to use the real `foo', rather than one of those
- * trampoline entries. MGO */
- /* If a trampoline symbol is found, we prefer to keep looking
- for the *real* symbol. If the actual symbol not found,
- then we'll use the trampoline entry. Sorry for the machine
- dependent code here, but I hope this will benefit other
- platforms as well. For trampoline entries, we used mst_unknown
- earlier. Perhaps we should define a `mst_trampoline' type?? */
-
- if (msymbol->type != mst_unknown)
- found_symbol = msymbol;
- else if (msymbol->type == mst_unknown && !trampoline_symbol)
- trampoline_symbol = msymbol;
-
+ /* FIXME: carlton/2003-02-27: This is an unholy
+ mixture of linkage names and natural names. If
+ you want to test the linkage names with strcmp,
+ do that. If you want to test the natural names
+ with strcmp_iw, use SYMBOL_MATCHES_NATURAL_NAME. */
+ if (strcmp (DEPRECATED_SYMBOL_NAME (msymbol), (name)) == 0
+ || (SYMBOL_DEMANGLED_NAME (msymbol) != NULL
+ && strcmp_iw (SYMBOL_DEMANGLED_NAME (msymbol),
+ (name)) == 0))
+ {
+ switch (MSYMBOL_TYPE (msymbol))
+ {
+ case mst_file_text:
+ case mst_file_data:
+ case mst_file_bss:
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ if (sfile == NULL
+ || strcmp (msymbol->filename, sfile) == 0)
+ found_file_symbol = msymbol;
#else
- found_symbol = msymbol;
+ /* We have neither the ability nor the need to
+ deal with the SFILE parameter. If we find
+ more than one symbol, just return the latest
+ one (the user can't expect useful behavior in
+ that case). */
+ found_file_symbol = msymbol;
#endif
+ break;
+
+ case mst_solib_trampoline:
+
+ /* If a trampoline symbol is found, we prefer to
+ keep looking for the *real* symbol. If the
+ actual symbol is not found, then we'll use the
+ trampoline entry. */
+ if (trampoline_symbol == NULL)
+ trampoline_symbol = msymbol;
+ break;
+
+ case mst_unknown:
+ default:
+ found_symbol = msymbol;
+ break;
+ }
+ }
+
+ /* Find the next symbol on the hash chain. */
+ if (pass == 1)
+ msymbol = msymbol->hash_next;
+ else
+ msymbol = msymbol->demangled_hash_next;
}
}
}
}
-#ifdef IBM6000_TARGET
- return found_symbol ? found_symbol : trampoline_symbol;
-#endif
+ /* External symbols are best. */
+ if (found_symbol)
+ return found_symbol;
- return (found_symbol);
+ /* File-local symbols are next best. */
+ if (found_file_symbol)
+ return found_file_symbol;
+
+ /* Symbols for shared library trampolines are next best. */
+ if (trampoline_symbol)
+ return trampoline_symbol;
+
+ return NULL;
}
+/* Look through all the current minimal symbol tables and find the
+ first minimal symbol that matches NAME and has text type. If OBJF
+ is non-NULL, limit the search to that objfile. Returns a pointer
+ to the minimal symbol that matches, or NULL if no match is found.
-/* Search through the minimal symbol table for each objfile and find the
- symbol whose address is the largest address that is still less than or
- equal to PC. Returns a pointer to the minimal symbol if such a symbol
- is found, or NULL if PC is not in a suitable range. Note that we need
- to look through ALL the minimal symbol tables before deciding on the
- symbol that comes closest to the specified PC. */
+ This function only searches the mangled (linkage) names. */
struct minimal_symbol *
-lookup_minimal_symbol_by_pc (pc)
- register CORE_ADDR pc;
+lookup_minimal_symbol_text (const char *name, struct objfile *objf)
{
- register int lo;
- register int hi;
- register int new;
- register struct objfile *objfile;
- register struct minimal_symbol *msymbol;
- register struct minimal_symbol *best_symbol = NULL;
+ struct objfile *objfile;
+ struct minimal_symbol *msymbol;
+ struct minimal_symbol *found_symbol = NULL;
+ struct minimal_symbol *found_file_symbol = NULL;
+
+ unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE;
+
+ for (objfile = object_files;
+ objfile != NULL && found_symbol == NULL;
+ objfile = objfile->next)
+ {
+ if (objf == NULL || objf == objfile)
+ {
+ for (msymbol = objfile->msymbol_hash[hash];
+ msymbol != NULL && found_symbol == NULL;
+ msymbol = msymbol->hash_next)
+ {
+ if (strcmp (SYMBOL_LINKAGE_NAME (msymbol), name) == 0 &&
+ (MSYMBOL_TYPE (msymbol) == mst_text ||
+ MSYMBOL_TYPE (msymbol) == mst_file_text))
+ {
+ switch (MSYMBOL_TYPE (msymbol))
+ {
+ case mst_file_text:
+ found_file_symbol = msymbol;
+ break;
+ default:
+ found_symbol = msymbol;
+ break;
+ }
+ }
+ }
+ }
+ }
+ /* External symbols are best. */
+ if (found_symbol)
+ return found_symbol;
+
+ /* File-local symbols are next best. */
+ if (found_file_symbol)
+ return found_file_symbol;
+
+ return NULL;
+}
+
+/* Look through all the current minimal symbol tables and find the
+ first minimal symbol that matches NAME and is a solib trampoline.
+ If OBJF is non-NULL, limit the search to that objfile. Returns a
+ pointer to the minimal symbol that matches, or NULL if no match is
+ found.
+
+ This function only searches the mangled (linkage) names. */
+
+struct minimal_symbol *
+lookup_minimal_symbol_solib_trampoline (const char *name,
+ struct objfile *objf)
+{
+ struct objfile *objfile;
+ struct minimal_symbol *msymbol;
+ struct minimal_symbol *found_symbol = NULL;
+
+ unsigned int hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE;
+
+ for (objfile = object_files;
+ objfile != NULL && found_symbol == NULL;
+ objfile = objfile->next)
+ {
+ if (objf == NULL || objf == objfile)
+ {
+ for (msymbol = objfile->msymbol_hash[hash];
+ msymbol != NULL && found_symbol == NULL;
+ msymbol = msymbol->hash_next)
+ {
+ if (strcmp (SYMBOL_LINKAGE_NAME (msymbol), name) == 0 &&
+ MSYMBOL_TYPE (msymbol) == mst_solib_trampoline)
+ return msymbol;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+
+/* Search through the minimal symbol table for each objfile and find
+ the symbol whose address is the largest address that is still less
+ than or equal to PC, and matches SECTION (if non-null). Returns a
+ pointer to the minimal symbol if such a symbol is found, or NULL if
+ PC is not in a suitable range. Note that we need to look through
+ ALL the minimal symbol tables before deciding on the symbol that
+ comes closest to the specified PC. This is because objfiles can
+ overlap, for example objfile A has .text at 0x100 and .data at
+ 0x40000 and objfile B has .text at 0x234 and .data at 0x40048. */
+
+struct minimal_symbol *
+lookup_minimal_symbol_by_pc_section (CORE_ADDR pc, asection *section)
+{
+ int lo;
+ int hi;
+ int new;
+ struct objfile *objfile;
+ struct minimal_symbol *msymbol;
+ struct minimal_symbol *best_symbol = NULL;
+ struct obj_section *pc_section;
+
+ /* pc has to be in a known section. This ensures that anything beyond
+ the end of the last segment doesn't appear to be part of the last
+ function in the last segment. */
+ pc_section = find_pc_section (pc);
+ if (pc_section == NULL)
+ return NULL;
+
+ /* If no section was specified, then just make sure that the PC is in
+ the same section as the minimal symbol we find. */
+ if (section == NULL)
+ section = pc_section->the_bfd_section;
+
+ /* FIXME drow/2003-07-19: Should we also check that PC is in SECTION
+ if we were passed a non-NULL SECTION argument? */
for (objfile = object_files;
objfile != NULL;
- objfile = objfile -> next)
+ objfile = objfile->next)
{
/* If this objfile has a minimal symbol table, go search it using
- a binary search. Note that a minimal symbol table always consists
- of at least two symbols, a "real" symbol and the terminating
- "null symbol". If there are no real symbols, then there is no
- minimal symbol table at all. */
+ a binary search. Note that a minimal symbol table always consists
+ of at least two symbols, a "real" symbol and the terminating
+ "null symbol". If there are no real symbols, then there is no
+ minimal symbol table at all. */
- if ((msymbol = objfile -> msymbols) != NULL)
+ if (objfile->minimal_symbol_count > 0)
{
+ msymbol = objfile->msymbols;
lo = 0;
- hi = objfile -> minimal_symbol_count - 1;
-
+ hi = objfile->minimal_symbol_count - 1;
+
/* This code assumes that the minimal symbols are sorted by
ascending address values. If the pc value is greater than or
equal to the first symbol's address, then some symbol in this
Warning: this code is trickier than it would appear at first. */
- /* Should also requires that pc is <= end of objfile. FIXME! */
- if (pc >= msymbol[lo].address)
+ /* Should also require that pc is <= end of objfile. FIXME! */
+ if (pc >= SYMBOL_VALUE_ADDRESS (&msymbol[lo]))
{
- while (msymbol[hi].address > pc)
+ while (SYMBOL_VALUE_ADDRESS (&msymbol[hi]) > pc)
{
/* pc is still strictly less than highest address */
/* Note "new" will always be >= lo */
new = (lo + hi) / 2;
- if ((msymbol[new].address >= pc) || (lo == new))
+ if ((SYMBOL_VALUE_ADDRESS (&msymbol[new]) >= pc) ||
+ (lo == new))
{
hi = new;
}
lo = new;
}
}
- /* The minimal symbol indexed by hi now is the best one in this
- objfile's minimal symbol table. See if it is the best one
- overall. */
- if ((best_symbol == NULL) ||
- (best_symbol -> address < msymbol[hi].address))
+ /* If we have multiple symbols at the same address, we want
+ hi to point to the last one. That way we can find the
+ right symbol if it has an index greater than hi. */
+ while (hi < objfile->minimal_symbol_count - 1
+ && (SYMBOL_VALUE_ADDRESS (&msymbol[hi])
+ == SYMBOL_VALUE_ADDRESS (&msymbol[hi + 1])))
+ hi++;
+
+ /* The minimal symbol indexed by hi now is the best one in this
+ objfile's minimal symbol table. See if it is the best one
+ overall. */
+
+ /* Skip any absolute symbols. This is apparently what adb
+ and dbx do, and is needed for the CM-5. There are two
+ known possible problems: (1) on ELF, apparently end, edata,
+ etc. are absolute. Not sure ignoring them here is a big
+ deal, but if we want to use them, the fix would go in
+ elfread.c. (2) I think shared library entry points on the
+ NeXT are absolute. If we want special handling for this
+ it probably should be triggered by a special
+ mst_abs_or_lib or some such. */
+ while (hi >= 0
+ && msymbol[hi].type == mst_abs)
+ --hi;
+
+ /* If "section" specified, skip any symbol from wrong section */
+ /* This is the new code that distinguishes it from the old function */
+ if (section)
+ while (hi >= 0
+ /* Some types of debug info, such as COFF,
+ don't fill the bfd_section member, so don't
+ throw away symbols on those platforms. */
+ && SYMBOL_BFD_SECTION (&msymbol[hi]) != NULL
+ && SYMBOL_BFD_SECTION (&msymbol[hi]) != section)
+ --hi;
+
+ if (hi >= 0
+ && ((best_symbol == NULL) ||
+ (SYMBOL_VALUE_ADDRESS (best_symbol) <
+ SYMBOL_VALUE_ADDRESS (&msymbol[hi]))))
{
best_symbol = &msymbol[hi];
}
}
- }
+ }
}
return (best_symbol);
}
+/* Backward compatibility: search through the minimal symbol table
+ for a matching PC (no section given) */
+
+struct minimal_symbol *
+lookup_minimal_symbol_by_pc (CORE_ADDR pc)
+{
+ return lookup_minimal_symbol_by_pc_section (pc, find_pc_mapped_section (pc));
+}
+\f
+
+/* Return leading symbol character for a BFD. If BFD is NULL,
+ return the leading symbol character from the main objfile. */
+
+static int get_symbol_leading_char (bfd *);
+
+static int
+get_symbol_leading_char (bfd *abfd)
+{
+ if (abfd != NULL)
+ return bfd_get_symbol_leading_char (abfd);
+ if (symfile_objfile != NULL && symfile_objfile->obfd != NULL)
+ return bfd_get_symbol_leading_char (symfile_objfile->obfd);
+ return 0;
+}
+
/* Prepare to start collecting minimal symbols. Note that presetting
msym_bunch_index to BUNCH_SIZE causes the first call to save a minimal
symbol to allocate the memory for the first bunch. */
void
-init_minimal_symbol_collection ()
+init_minimal_symbol_collection (void)
{
msym_count = 0;
msym_bunch = NULL;
}
void
-prim_record_minimal_symbol (name, address, ms_type)
- const char *name;
- CORE_ADDR address;
- enum minimal_symbol_type ms_type;
+prim_record_minimal_symbol (const char *name, CORE_ADDR address,
+ enum minimal_symbol_type ms_type,
+ struct objfile *objfile)
{
- register struct msym_bunch *new;
+ int section;
- if (msym_bunch_index == BUNCH_SIZE)
+ switch (ms_type)
{
- new = (struct msym_bunch *) xmalloc (sizeof (struct msym_bunch));
- msym_bunch_index = 0;
- new -> next = msym_bunch;
- msym_bunch = new;
+ case mst_text:
+ case mst_file_text:
+ case mst_solib_trampoline:
+ section = SECT_OFF_TEXT (objfile);
+ break;
+ case mst_data:
+ case mst_file_data:
+ section = SECT_OFF_DATA (objfile);
+ break;
+ case mst_bss:
+ case mst_file_bss:
+ section = SECT_OFF_BSS (objfile);
+ break;
+ default:
+ section = -1;
}
- msym_bunch -> contents[msym_bunch_index].name = (char *) name;
- msym_bunch -> contents[msym_bunch_index].address = address;
- msym_bunch -> contents[msym_bunch_index].info = NULL;
- msym_bunch -> contents[msym_bunch_index].type = ms_type;
- msym_bunch_index++;
- msym_count++;
+
+ prim_record_minimal_symbol_and_info (name, address, ms_type,
+ NULL, section, NULL, objfile);
}
-void
-prim_record_minimal_symbol_and_info (name, address, ms_type, info)
- const char *name;
- CORE_ADDR address;
- enum minimal_symbol_type ms_type;
- char *info;
+/* Record a minimal symbol in the msym bunches. Returns the symbol
+ newly created. */
+
+struct minimal_symbol *
+prim_record_minimal_symbol_and_info (const char *name, CORE_ADDR address,
+ enum minimal_symbol_type ms_type,
+ char *info, int section,
+ asection *bfd_section,
+ struct objfile *objfile)
{
- register struct msym_bunch *new;
+ struct msym_bunch *new;
+ struct minimal_symbol *msymbol;
+
+ if (ms_type == mst_file_text)
+ {
+ /* Don't put gcc_compiled, __gnu_compiled_cplus, and friends into
+ the minimal symbols, because if there is also another symbol
+ at the same address (e.g. the first function of the file),
+ lookup_minimal_symbol_by_pc would have no way of getting the
+ right one. */
+ if (name[0] == 'g'
+ && (strcmp (name, GCC_COMPILED_FLAG_SYMBOL) == 0
+ || strcmp (name, GCC2_COMPILED_FLAG_SYMBOL) == 0))
+ return (NULL);
+
+ {
+ const char *tempstring = name;
+ if (tempstring[0] == get_symbol_leading_char (objfile->obfd))
+ ++tempstring;
+ if (strncmp (tempstring, "__gnu_compiled", 14) == 0)
+ return (NULL);
+ }
+ }
if (msym_bunch_index == BUNCH_SIZE)
{
new = (struct msym_bunch *) xmalloc (sizeof (struct msym_bunch));
msym_bunch_index = 0;
- new -> next = msym_bunch;
+ new->next = msym_bunch;
msym_bunch = new;
}
- msym_bunch -> contents[msym_bunch_index].name = (char *) name;
- msym_bunch -> contents[msym_bunch_index].address = address;
- msym_bunch -> contents[msym_bunch_index].info = NULL;
- msym_bunch -> contents[msym_bunch_index].type = ms_type;
- /* FIXME: This info, if it remains, needs its own field. */
- msym_bunch -> contents[msym_bunch_index].info = info; /* FIXME! */
+ msymbol = &msym_bunch->contents[msym_bunch_index];
+ SYMBOL_INIT_LANGUAGE_SPECIFIC (msymbol, language_unknown);
+ SYMBOL_LANGUAGE (msymbol) = language_auto;
+ SYMBOL_SET_NAMES (msymbol, (char *)name, strlen (name), objfile);
+
+ SYMBOL_VALUE_ADDRESS (msymbol) = address;
+ SYMBOL_SECTION (msymbol) = section;
+ SYMBOL_BFD_SECTION (msymbol) = bfd_section;
+
+ MSYMBOL_TYPE (msymbol) = ms_type;
+ /* FIXME: This info, if it remains, needs its own field. */
+ MSYMBOL_INFO (msymbol) = info; /* FIXME! */
+
+ /* The hash pointers must be cleared! If they're not,
+ add_minsym_to_hash_table will NOT add this msymbol to the hash table. */
+ msymbol->hash_next = NULL;
+ msymbol->demangled_hash_next = NULL;
+
msym_bunch_index++;
msym_count++;
+ OBJSTAT (objfile, n_minsyms++);
+ return msymbol;
}
/* Compare two minimal symbols by address and return a signed result based
- on unsigned comparisons, so that we sort into unsigned numeric order. */
+ on unsigned comparisons, so that we sort into unsigned numeric order.
+ Within groups with the same address, sort by name. */
static int
-compare_minimal_symbols (fn1p, fn2p)
- const PTR fn1p;
- const PTR fn2p;
+compare_minimal_symbols (const void *fn1p, const void *fn2p)
{
- register const struct minimal_symbol *fn1;
- register const struct minimal_symbol *fn2;
+ const struct minimal_symbol *fn1;
+ const struct minimal_symbol *fn2;
fn1 = (const struct minimal_symbol *) fn1p;
fn2 = (const struct minimal_symbol *) fn2p;
- if (fn1 -> address < fn2 -> address)
+ if (SYMBOL_VALUE_ADDRESS (fn1) < SYMBOL_VALUE_ADDRESS (fn2))
{
- return (-1);
+ return (-1); /* addr 1 is less than addr 2 */
}
- else if (fn1 -> address > fn2 -> address)
+ else if (SYMBOL_VALUE_ADDRESS (fn1) > SYMBOL_VALUE_ADDRESS (fn2))
{
- return (1);
+ return (1); /* addr 1 is greater than addr 2 */
}
else
+ /* addrs are equal: sort by name */
{
- return (0);
+ char *name1 = SYMBOL_LINKAGE_NAME (fn1);
+ char *name2 = SYMBOL_LINKAGE_NAME (fn2);
+
+ if (name1 && name2) /* both have names */
+ return strcmp (name1, name2);
+ else if (name2)
+ return 1; /* fn1 has no name, so it is "less" */
+ else if (name1) /* fn2 has no name, so it is "less" */
+ return -1;
+ else
+ return (0); /* neither has a name, so they're equal. */
}
}
obstack and then simply blow the obstack away when we are done with
it. Is it worth the extra trouble though? */
-/* ARGSUSED */
-void
-discard_minimal_symbols (foo)
- int foo;
+static void
+do_discard_minimal_symbols_cleanup (void *arg)
{
- register struct msym_bunch *next;
+ struct msym_bunch *next;
while (msym_bunch != NULL)
{
- next = msym_bunch -> next;
- free ((PTR)msym_bunch);
+ next = msym_bunch->next;
+ xfree (msym_bunch);
msym_bunch = next;
}
}
+struct cleanup *
+make_cleanup_discard_minimal_symbols (void)
+{
+ return make_cleanup (do_discard_minimal_symbols_cleanup, 0);
+}
+
+
+
/* Compact duplicate entries out of a minimal symbol table by walking
through the table and compacting out entries with duplicate addresses
and matching names. Return the number of entries remaining.
overwrite its type with the type from the one we are compacting out. */
static int
-compact_minimal_symbols (msymbol, mcount)
- struct minimal_symbol *msymbol;
- int mcount;
+compact_minimal_symbols (struct minimal_symbol *msymbol, int mcount,
+ struct objfile *objfile)
{
struct minimal_symbol *copyfrom;
struct minimal_symbol *copyto;
copyfrom = copyto = msymbol;
while (copyfrom < msymbol + mcount - 1)
{
- if (copyfrom -> address == (copyfrom + 1) -> address
- && (strcmp (copyfrom -> name, (copyfrom + 1) -> name) == 0))
+ if (SYMBOL_VALUE_ADDRESS (copyfrom)
+ == SYMBOL_VALUE_ADDRESS ((copyfrom + 1))
+ && strcmp (SYMBOL_LINKAGE_NAME (copyfrom),
+ SYMBOL_LINKAGE_NAME ((copyfrom + 1))) == 0)
{
- if ((copyfrom + 1) -> type == mst_unknown)
+ if (MSYMBOL_TYPE ((copyfrom + 1)) == mst_unknown)
{
- (copyfrom + 1) -> type = copyfrom -> type;
+ MSYMBOL_TYPE ((copyfrom + 1)) = MSYMBOL_TYPE (copyfrom);
}
copyfrom++;
}
else
- {
- *copyto++ = *copyfrom++;
- }
+ *copyto++ = *copyfrom++;
}
*copyto++ = *copyfrom++;
mcount = copyto - msymbol;
return (mcount);
}
-/* Add the minimal symbols in the existing bunches to the objfile's
- official minimal symbol table. 99% of the time, this adds the
- bunches to NO existing symbols. Once in a while for shared
- libraries, we add symbols (e.g. common symbols) to an existing
- objfile. */
+/* Build (or rebuild) the minimal symbol hash tables. This is necessary
+ after compacting or sorting the table since the entries move around
+ thus causing the internal minimal_symbol pointers to become jumbled. */
+
+static void
+build_minimal_symbol_hash_tables (struct objfile *objfile)
+{
+ int i;
+ struct minimal_symbol *msym;
+
+ /* Clear the hash tables. */
+ for (i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++)
+ {
+ objfile->msymbol_hash[i] = 0;
+ objfile->msymbol_demangled_hash[i] = 0;
+ }
+
+ /* Now, (re)insert the actual entries. */
+ for (i = objfile->minimal_symbol_count, msym = objfile->msymbols;
+ i > 0;
+ i--, msym++)
+ {
+ msym->hash_next = 0;
+ add_minsym_to_hash_table (msym, objfile->msymbol_hash);
+
+ msym->demangled_hash_next = 0;
+ if (SYMBOL_DEMANGLED_NAME (msym) != NULL)
+ add_minsym_to_demangled_hash_table (msym,
+ objfile->msymbol_demangled_hash);
+ }
+}
+
+/* Add the minimal symbols in the existing bunches to the objfile's official
+ minimal symbol table. In most cases there is no minimal symbol table yet
+ for this objfile, and the existing bunches are used to create one. Once
+ in a while (for shared libraries for example), we add symbols (e.g. common
+ symbols) to an existing objfile.
+
+ Because of the way minimal symbols are collected, we generally have no way
+ of knowing what source language applies to any particular minimal symbol.
+ Specifically, we have no way of knowing if the minimal symbol comes from a
+ C++ compilation unit or not. So for the sake of supporting cached
+ demangled C++ names, we have no choice but to try and demangle each new one
+ that comes in. If the demangling succeeds, then we assume it is a C++
+ symbol and set the symbol's language and demangled name fields
+ appropriately. Note that in order to avoid unnecessary demanglings, and
+ allocating obstack space that subsequently can't be freed for the demangled
+ names, we mark all newly added symbols with language_auto. After
+ compaction of the minimal symbols, we go back and scan the entire minimal
+ symbol table looking for these new symbols. For each new symbol we attempt
+ to demangle it, and if successful, record it as a language_cplus symbol
+ and cache the demangled form on the symbol obstack. Symbols which don't
+ demangle are marked as language_unknown symbols, which inhibits future
+ attempts to demangle them if we later add more minimal symbols. */
void
-install_minimal_symbols (objfile)
- struct objfile *objfile;
+install_minimal_symbols (struct objfile *objfile)
{
- register int bindex;
- register int mcount;
- register struct msym_bunch *bunch;
- register struct minimal_symbol *msymbols;
+ int bindex;
+ int mcount;
+ struct msym_bunch *bunch;
+ struct minimal_symbol *msymbols;
int alloc_count;
+ char leading_char;
if (msym_count > 0)
{
/* Allocate enough space in the obstack, into which we will gather the
- bunches of new and existing minimal symbols, sort them, and then
- compact out the duplicate entries. Once we have a final table,
- we will give back the excess space. */
+ bunches of new and existing minimal symbols, sort them, and then
+ compact out the duplicate entries. Once we have a final table,
+ we will give back the excess space. */
alloc_count = msym_count + objfile->minimal_symbol_count + 1;
obstack_blank (&objfile->symbol_obstack,
alloc_count * sizeof (struct minimal_symbol));
msymbols = (struct minimal_symbol *)
- obstack_base (&objfile->symbol_obstack);
+ obstack_base (&objfile->symbol_obstack);
/* Copy in the existing minimal symbols, if there are any. */
if (objfile->minimal_symbol_count)
- memcpy ((char *)msymbols, (char *)objfile->msymbols,
- objfile->minimal_symbol_count * sizeof (struct minimal_symbol));
+ memcpy ((char *) msymbols, (char *) objfile->msymbols,
+ objfile->minimal_symbol_count * sizeof (struct minimal_symbol));
/* Walk through the list of minimal symbol bunches, adding each symbol
- to the new contiguous array of symbols. Note that we start with the
- current, possibly partially filled bunch (thus we use the current
- msym_bunch_index for the first bunch we copy over), and thereafter
- each bunch is full. */
-
+ to the new contiguous array of symbols. Note that we start with the
+ current, possibly partially filled bunch (thus we use the current
+ msym_bunch_index for the first bunch we copy over), and thereafter
+ each bunch is full. */
+
mcount = objfile->minimal_symbol_count;
-
- for (bunch = msym_bunch; bunch != NULL; bunch = bunch -> next)
+ leading_char = get_symbol_leading_char (objfile->obfd);
+
+ for (bunch = msym_bunch; bunch != NULL; bunch = bunch->next)
{
for (bindex = 0; bindex < msym_bunch_index; bindex++, mcount++)
{
- msymbols[mcount] = bunch -> contents[bindex];
-#ifdef NAMES_HAVE_UNDERSCORE
- if (msymbols[mcount].name[0] == '_')
+ msymbols[mcount] = bunch->contents[bindex];
+ if (SYMBOL_LINKAGE_NAME (&msymbols[mcount])[0] == leading_char)
{
- msymbols[mcount].name++;
+ SYMBOL_LINKAGE_NAME (&msymbols[mcount])++;
}
-#endif
-#ifdef SOME_NAMES_HAVE_DOT
- if (msymbols[mcount].name[0] == '.')
- {
- msymbols[mcount].name++;
- }
-#endif
}
msym_bunch_index = BUNCH_SIZE;
}
/* Sort the minimal symbols by address. */
-
+
qsort (msymbols, mcount, sizeof (struct minimal_symbol),
compare_minimal_symbols);
-
+
/* Compact out any duplicates, and free up whatever space we are
- no longer using. */
-
- mcount = compact_minimal_symbols (msymbols, mcount);
+ no longer using. */
+
+ mcount = compact_minimal_symbols (msymbols, mcount, objfile);
obstack_blank (&objfile->symbol_obstack,
- (mcount + 1 - alloc_count) * sizeof (struct minimal_symbol));
+ (mcount + 1 - alloc_count) * sizeof (struct minimal_symbol));
msymbols = (struct minimal_symbol *)
obstack_finish (&objfile->symbol_obstack);
- /* We also terminate the minimal symbol table
- with a "null symbol", which is *not* included in the size of
- the table. This makes it easier to find the end of the table
- when we are handed a pointer to some symbol in the middle of it.
- Zero out the fields in the "null symbol" allocated at the end
- of the array. Note that the symbol count does *not* include
- this null symbol, which is why it is indexed by mcount and not
- mcount-1. */
+ /* We also terminate the minimal symbol table with a "null symbol",
+ which is *not* included in the size of the table. This makes it
+ easier to find the end of the table when we are handed a pointer
+ to some symbol in the middle of it. Zero out the fields in the
+ "null symbol" allocated at the end of the array. Note that the
+ symbol count does *not* include this null symbol, which is why it
+ is indexed by mcount and not mcount-1. */
- msymbols[mcount].name = NULL;
- msymbols[mcount].address = 0;
- msymbols[mcount].info = NULL;
- msymbols[mcount].type = mst_unknown;
+ SYMBOL_LINKAGE_NAME (&msymbols[mcount]) = NULL;
+ SYMBOL_VALUE_ADDRESS (&msymbols[mcount]) = 0;
+ MSYMBOL_INFO (&msymbols[mcount]) = NULL;
+ MSYMBOL_TYPE (&msymbols[mcount]) = mst_unknown;
+ SYMBOL_INIT_LANGUAGE_SPECIFIC (&msymbols[mcount], language_unknown);
/* Attach the minimal symbol table to the specified objfile.
- The strings themselves are also located in the symbol_obstack
- of this objfile. */
-
- objfile -> minimal_symbol_count = mcount;
- objfile -> msymbols = msymbols;
+ The strings themselves are also located in the symbol_obstack
+ of this objfile. */
+
+ objfile->minimal_symbol_count = mcount;
+ objfile->msymbols = msymbols;
+
+ /* Try to guess the appropriate C++ ABI by looking at the names
+ of the minimal symbols in the table. */
+ {
+ int i;
+
+ for (i = 0; i < mcount; i++)
+ {
+ /* If a symbol's name starts with _Z and was successfully
+ demangled, then we can assume we've found a GNU v3 symbol.
+ For now we set the C++ ABI globally; if the user is
+ mixing ABIs then the user will need to "set cp-abi"
+ manually. */
+ const char *name = SYMBOL_LINKAGE_NAME (&objfile->msymbols[i]);
+ if (name[0] == '_' && name[1] == 'Z'
+ && SYMBOL_DEMANGLED_NAME (&objfile->msymbols[i]) != NULL)
+ {
+ set_cp_abi_as_auto_default ("gnu-v3");
+ break;
+ }
+ }
+ }
+
+ /* Now build the hash tables; we can't do this incrementally
+ at an earlier point since we weren't finished with the obstack
+ yet. (And if the msymbol obstack gets moved, all the internal
+ pointers to other msymbols need to be adjusted.) */
+ build_minimal_symbol_hash_tables (objfile);
}
}
+/* Sort all the minimal symbols in OBJFILE. */
+
+void
+msymbols_sort (struct objfile *objfile)
+{
+ qsort (objfile->msymbols, objfile->minimal_symbol_count,
+ sizeof (struct minimal_symbol), compare_minimal_symbols);
+ build_minimal_symbol_hash_tables (objfile);
+}
+
+/* Check if PC is in a shared library trampoline code stub.
+ Return minimal symbol for the trampoline entry or NULL if PC is not
+ in a trampoline code stub. */
+
+struct minimal_symbol *
+lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc)
+{
+ struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (pc);
+
+ if (msymbol != NULL && MSYMBOL_TYPE (msymbol) == mst_solib_trampoline)
+ return msymbol;
+ return NULL;
+}
+
+/* If PC is in a shared library trampoline code stub, return the
+ address of the `real' function belonging to the stub.
+ Return 0 if PC is not in a trampoline code stub or if the real
+ function is not found in the minimal symbol table.
+
+ We may fail to find the right function if a function with the
+ same name is defined in more than one shared library, but this
+ is considered bad programming style. We could return 0 if we find
+ a duplicate function in case this matters someday. */
+
+CORE_ADDR
+find_solib_trampoline_target (CORE_ADDR pc)
+{
+ struct objfile *objfile;
+ struct minimal_symbol *msymbol;
+ struct minimal_symbol *tsymbol = lookup_solib_trampoline_symbol_by_pc (pc);
+
+ if (tsymbol != NULL)
+ {
+ ALL_MSYMBOLS (objfile, msymbol)
+ {
+ if (MSYMBOL_TYPE (msymbol) == mst_text
+ && strcmp (SYMBOL_LINKAGE_NAME (msymbol),
+ SYMBOL_LINKAGE_NAME (tsymbol)) == 0)
+ return SYMBOL_VALUE_ADDRESS (msymbol);
+ }
+ }
+ return 0;
+}
projects / deliverable / binutils-gdb.git / blobdiff