1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 2002, 2003, 2004, 2007, 2008, 2009 Free Software Foundation, Inc.
6 Contributed by Cygnus Support, using pieces from other GDB modules.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* This file contains support routines for creating, manipulating, and
24 destroying objfile structures. */
27 #include "bfd.h" /* Binary File Description */
31 #include "gdb-stabs.h"
34 #include "mdebugread.h"
35 #include "expression.h"
36 #include "parser-defs.h"
38 #include "gdb_assert.h"
39 #include <sys/types.h>
42 #include "gdb_obstack.h"
43 #include "gdb_string.h"
46 #include "breakpoint.h"
48 #include "dictionary.h"
51 #include "arch-utils.h"
55 /* Prototypes for local functions */
57 static void objfile_alloc_data (struct objfile *objfile);
58 static void objfile_free_data (struct objfile *objfile);
60 /* Externally visible variables that are owned by this module.
61 See declarations in objfile.h for more info. */
63 struct objfile *object_files; /* Linked list of all objfiles */
64 struct objfile *current_objfile; /* For symbol file being read in */
65 struct objfile *symfile_objfile; /* Main symbol table loaded from */
66 struct objfile *rt_common_objfile; /* For runtime common symbols */
68 /* Records whether any objfiles appeared or disappeared since we last updated
69 address to obj section map. */
71 static int objfiles_changed_p;
73 /* Locate all mappable sections of a BFD file.
74 objfile_p_char is a char * to get it through
75 bfd_map_over_sections; we cast it back to its proper type. */
77 /* Called via bfd_map_over_sections to build up the section table that
78 the objfile references. The objfile contains pointers to the start
79 of the table (objfile->sections) and to the first location after
80 the end of the table (objfile->sections_end). */
83 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
86 struct objfile *objfile = (struct objfile *) objfile_p_char;
87 struct obj_section section;
90 aflag = bfd_get_section_flags (abfd, asect);
92 if (!(aflag & SEC_ALLOC))
95 if (0 == bfd_section_size (abfd, asect))
97 section.objfile = objfile;
98 section.the_bfd_section = asect;
99 section.ovly_mapped = 0;
100 obstack_grow (&objfile->objfile_obstack, (char *) §ion, sizeof (section));
101 objfile->sections_end
102 = (struct obj_section *) (((size_t) objfile->sections_end) + 1);
105 /* Builds a section table for OBJFILE.
106 Returns 0 if OK, 1 on error (in which case bfd_error contains the
109 Note that while we are building the table, which goes into the
110 psymbol obstack, we hijack the sections_end pointer to instead hold
111 a count of the number of sections. When bfd_map_over_sections
112 returns, this count is used to compute the pointer to the end of
113 the sections table, which then overwrites the count.
115 Also note that the OFFSET and OVLY_MAPPED in each table entry
116 are initialized to zero.
118 Also note that if anything else writes to the psymbol obstack while
119 we are building the table, we're pretty much hosed. */
122 build_objfile_section_table (struct objfile *objfile)
124 /* objfile->sections can be already set when reading a mapped symbol
125 file. I believe that we do need to rebuild the section table in
126 this case (we rebuild other things derived from the bfd), but we
127 can't free the old one (it's in the objfile_obstack). So we just
128 waste some memory. */
130 objfile->sections_end = 0;
131 bfd_map_over_sections (objfile->obfd,
132 add_to_objfile_sections, (void *) objfile);
133 objfile->sections = obstack_finish (&objfile->objfile_obstack);
134 objfile->sections_end = objfile->sections + (size_t) objfile->sections_end;
138 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
139 allocate a new objfile struct, fill it in as best we can, link it
140 into the list of all known objfiles, and return a pointer to the
143 The FLAGS word contains various bits (OBJF_*) that can be taken as
144 requests for specific operations. Other bits like OBJF_SHARED are
145 simply copied through to the new objfile flags member. */
147 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
148 by jv-lang.c, to create an artificial objfile used to hold
149 information about dynamically-loaded Java classes. Unfortunately,
150 that branch of this function doesn't get tested very frequently, so
151 it's prone to breakage. (E.g. at one time the name was set to NULL
152 in that situation, which broke a loop over all names in the dynamic
153 library loader.) If you change this function, please try to leave
154 things in a consistent state even if abfd is NULL. */
157 allocate_objfile (bfd *abfd, int flags)
159 struct objfile *objfile = NULL;
160 struct objfile *last_one = NULL;
162 /* If we don't support mapped symbol files, didn't ask for the file to be
163 mapped, or failed to open the mapped file for some reason, then revert
164 back to an unmapped objfile. */
168 objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
169 memset (objfile, 0, sizeof (struct objfile));
170 objfile->psymbol_cache = bcache_xmalloc ();
171 objfile->macro_cache = bcache_xmalloc ();
172 /* We could use obstack_specify_allocation here instead, but
173 gdb_obstack.h specifies the alloc/dealloc functions. */
174 obstack_init (&objfile->objfile_obstack);
175 terminate_minimal_symbol_table (objfile);
178 objfile_alloc_data (objfile);
180 /* Update the per-objfile information that comes from the bfd, ensuring
181 that any data that is reference is saved in the per-objfile data
184 objfile->obfd = gdb_bfd_ref (abfd);
185 if (objfile->name != NULL)
187 xfree (objfile->name);
191 /* Look up the gdbarch associated with the BFD. */
192 objfile->gdbarch = gdbarch_from_bfd (abfd);
194 objfile->name = xstrdup (bfd_get_filename (abfd));
195 objfile->mtime = bfd_get_mtime (abfd);
197 /* Build section table. */
199 if (build_objfile_section_table (objfile))
201 error (_("Can't find the file sections in `%s': %s"),
202 objfile->name, bfd_errmsg (bfd_get_error ()));
207 objfile->name = xstrdup ("<<anonymous objfile>>");
210 /* Initialize the section indexes for this objfile, so that we can
211 later detect if they are used w/o being properly assigned to. */
213 objfile->sect_index_text = -1;
214 objfile->sect_index_data = -1;
215 objfile->sect_index_bss = -1;
216 objfile->sect_index_rodata = -1;
218 /* We don't yet have a C++-specific namespace symtab. */
220 objfile->cp_namespace_symtab = NULL;
222 /* Add this file onto the tail of the linked list of other such files. */
224 objfile->next = NULL;
225 if (object_files == NULL)
226 object_files = objfile;
229 for (last_one = object_files;
231 last_one = last_one->next);
232 last_one->next = objfile;
235 /* Save passed in flag bits. */
236 objfile->flags |= flags;
238 objfiles_changed_p = 1; /* Rebuild section map next time we need it. */
243 /* Retrieve the gdbarch associated with OBJFILE. */
245 get_objfile_arch (struct objfile *objfile)
247 return objfile->gdbarch;
250 /* Initialize entry point information for this objfile. */
253 init_entry_point_info (struct objfile *objfile)
255 /* Save startup file's range of PC addresses to help blockframe.c
256 decide where the bottom of the stack is. */
258 if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
260 /* Executable file -- record its entry point so we'll recognize
261 the startup file because it contains the entry point. */
262 objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
264 else if (bfd_get_file_flags (objfile->obfd) & DYNAMIC
265 && bfd_get_start_address (objfile->obfd) != 0)
266 /* Some shared libraries may have entry points set and be
267 runnable. There's no clear way to indicate this, so just check
268 for values other than zero. */
269 objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
272 /* Examination of non-executable.o files. Short-circuit this stuff. */
273 objfile->ei.entry_point = INVALID_ENTRY_POINT;
277 /* Get current entry point address. */
280 entry_point_address (void)
282 struct gdbarch *gdbarch;
283 CORE_ADDR entry_point;
285 if (symfile_objfile == NULL)
288 gdbarch = get_objfile_arch (symfile_objfile);
290 entry_point = symfile_objfile->ei.entry_point;
292 /* Make certain that the address points at real code, and not a
293 function descriptor. */
294 entry_point = gdbarch_convert_from_func_ptr_addr (gdbarch, entry_point,
297 /* Remove any ISA markers, so that this matches entries in the
299 entry_point = gdbarch_addr_bits_remove (gdbarch, entry_point);
304 /* Create the terminating entry of OBJFILE's minimal symbol table.
305 If OBJFILE->msymbols is zero, allocate a single entry from
306 OBJFILE->objfile_obstack; otherwise, just initialize
307 OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */
309 terminate_minimal_symbol_table (struct objfile *objfile)
311 if (! objfile->msymbols)
312 objfile->msymbols = ((struct minimal_symbol *)
313 obstack_alloc (&objfile->objfile_obstack,
314 sizeof (objfile->msymbols[0])));
317 struct minimal_symbol *m
318 = &objfile->msymbols[objfile->minimal_symbol_count];
320 memset (m, 0, sizeof (*m));
321 /* Don't rely on these enumeration values being 0's. */
322 MSYMBOL_TYPE (m) = mst_unknown;
323 SYMBOL_INIT_LANGUAGE_SPECIFIC (m, language_unknown);
328 /* Put one object file before a specified on in the global list.
329 This can be used to make sure an object file is destroyed before
330 another when using ALL_OBJFILES_SAFE to free all objfiles. */
332 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
334 struct objfile **objp;
336 unlink_objfile (objfile);
338 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
340 if (*objp == before_this)
342 objfile->next = *objp;
348 internal_error (__FILE__, __LINE__,
349 _("put_objfile_before: before objfile not in list"));
352 /* Put OBJFILE at the front of the list. */
355 objfile_to_front (struct objfile *objfile)
357 struct objfile **objp;
358 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
360 if (*objp == objfile)
362 /* Unhook it from where it is. */
363 *objp = objfile->next;
364 /* Put it in the front. */
365 objfile->next = object_files;
366 object_files = objfile;
372 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
375 It is not a bug, or error, to call this function if OBJFILE is not known
376 to be in the current list. This is done in the case of mapped objfiles,
377 for example, just to ensure that the mapped objfile doesn't appear twice
378 in the list. Since the list is threaded, linking in a mapped objfile
379 twice would create a circular list.
381 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
382 unlinking it, just to ensure that we have completely severed any linkages
383 between the OBJFILE and the list. */
386 unlink_objfile (struct objfile *objfile)
388 struct objfile **objpp;
390 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
392 if (*objpp == objfile)
394 *objpp = (*objpp)->next;
395 objfile->next = NULL;
400 internal_error (__FILE__, __LINE__,
401 _("unlink_objfile: objfile already unlinked"));
405 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
406 that as much as possible is allocated on the objfile_obstack
407 so that the memory can be efficiently freed.
409 Things which we do NOT free because they are not in malloc'd memory
410 or not in memory specific to the objfile include:
414 FIXME: If the objfile is using reusable symbol information (via mmalloc),
415 then we need to take into account the fact that more than one process
416 may be using the symbol information at the same time (when mmalloc is
417 extended to support cooperative locking). When more than one process
418 is using the mapped symbol info, we need to be more careful about when
419 we free objects in the reusable area. */
422 free_objfile (struct objfile *objfile)
424 if (objfile->separate_debug_objfile)
426 free_objfile (objfile->separate_debug_objfile);
429 if (objfile->separate_debug_objfile_backlink)
431 /* We freed the separate debug file, make sure the base objfile
432 doesn't reference it. */
433 objfile->separate_debug_objfile_backlink->separate_debug_objfile = NULL;
436 /* Remove any references to this objfile in the global value
438 preserve_values (objfile);
440 /* First do any symbol file specific actions required when we are
441 finished with a particular symbol file. Note that if the objfile
442 is using reusable symbol information (via mmalloc) then each of
443 these routines is responsible for doing the correct thing, either
444 freeing things which are valid only during this particular gdb
445 execution, or leaving them to be reused during the next one. */
447 if (objfile->sf != NULL)
449 (*objfile->sf->sym_finish) (objfile);
452 /* Discard any data modules have associated with the objfile. */
453 objfile_free_data (objfile);
455 gdb_bfd_unref (objfile->obfd);
457 /* Remove it from the chain of all objfiles. */
459 unlink_objfile (objfile);
461 /* If we are going to free the runtime common objfile, mark it
464 if (objfile == rt_common_objfile)
465 rt_common_objfile = NULL;
467 /* Before the symbol table code was redone to make it easier to
468 selectively load and remove information particular to a specific
469 linkage unit, gdb used to do these things whenever the monolithic
470 symbol table was blown away. How much still needs to be done
471 is unknown, but we play it safe for now and keep each action until
472 it is shown to be no longer needed. */
474 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
475 for example), so we need to call this here. */
476 clear_pc_function_cache ();
478 /* Clear globals which might have pointed into a removed objfile.
479 FIXME: It's not clear which of these are supposed to persist
480 between expressions and which ought to be reset each time. */
481 expression_context_block = NULL;
482 innermost_block = NULL;
484 /* Check to see if the current_source_symtab belongs to this objfile,
485 and if so, call clear_current_source_symtab_and_line. */
488 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
491 ALL_OBJFILE_SYMTABS (objfile, s)
493 if (s == cursal.symtab)
494 clear_current_source_symtab_and_line ();
498 /* The last thing we do is free the objfile struct itself. */
500 if (objfile->name != NULL)
502 xfree (objfile->name);
504 if (objfile->global_psymbols.list)
505 xfree (objfile->global_psymbols.list);
506 if (objfile->static_psymbols.list)
507 xfree (objfile->static_psymbols.list);
508 /* Free the obstacks for non-reusable objfiles */
509 bcache_xfree (objfile->psymbol_cache);
510 bcache_xfree (objfile->macro_cache);
511 if (objfile->demangled_names_hash)
512 htab_delete (objfile->demangled_names_hash);
513 obstack_free (&objfile->objfile_obstack, 0);
516 objfiles_changed_p = 1; /* Rebuild section map next time we need it. */
520 do_free_objfile_cleanup (void *obj)
526 make_cleanup_free_objfile (struct objfile *obj)
528 return make_cleanup (do_free_objfile_cleanup, obj);
531 /* Free all the object files at once and clean up their users. */
534 free_all_objfiles (void)
536 struct objfile *objfile, *temp;
538 ALL_OBJFILES_SAFE (objfile, temp)
540 free_objfile (objfile);
542 clear_symtab_users ();
545 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
546 entries in new_offsets. */
548 objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets)
550 struct obj_section *s;
551 struct section_offsets *delta =
552 ((struct section_offsets *)
553 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
557 int something_changed = 0;
558 for (i = 0; i < objfile->num_sections; ++i)
561 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
562 if (ANOFFSET (delta, i) != 0)
563 something_changed = 1;
565 if (!something_changed)
569 /* OK, get all the symtabs. */
573 ALL_OBJFILE_SYMTABS (objfile, s)
576 struct blockvector *bv;
579 /* First the line table. */
583 for (i = 0; i < l->nitems; ++i)
584 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
587 /* Don't relocate a shared blockvector more than once. */
591 bv = BLOCKVECTOR (s);
592 if (BLOCKVECTOR_MAP (bv))
593 addrmap_relocate (BLOCKVECTOR_MAP (bv),
594 ANOFFSET (delta, s->block_line_section));
596 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
600 struct dict_iterator iter;
602 b = BLOCKVECTOR_BLOCK (bv, i);
603 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
604 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
606 ALL_BLOCK_SYMBOLS (b, iter, sym)
608 fixup_symbol_section (sym, objfile);
610 /* The RS6000 code from which this was taken skipped
611 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
612 But I'm leaving out that test, on the theory that
613 they can't possibly pass the tests below. */
614 if ((SYMBOL_CLASS (sym) == LOC_LABEL
615 || SYMBOL_CLASS (sym) == LOC_STATIC)
616 && SYMBOL_SECTION (sym) >= 0)
618 SYMBOL_VALUE_ADDRESS (sym) +=
619 ANOFFSET (delta, SYMBOL_SECTION (sym));
627 struct partial_symtab *p;
629 ALL_OBJFILE_PSYMTABS (objfile, p)
631 p->textlow += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
632 p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
637 struct partial_symbol **psym;
639 for (psym = objfile->global_psymbols.list;
640 psym < objfile->global_psymbols.next;
643 fixup_psymbol_section (*psym, objfile);
644 if (SYMBOL_SECTION (*psym) >= 0)
645 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
646 SYMBOL_SECTION (*psym));
648 for (psym = objfile->static_psymbols.list;
649 psym < objfile->static_psymbols.next;
652 fixup_psymbol_section (*psym, objfile);
653 if (SYMBOL_SECTION (*psym) >= 0)
654 SYMBOL_VALUE_ADDRESS (*psym) += ANOFFSET (delta,
655 SYMBOL_SECTION (*psym));
660 struct minimal_symbol *msym;
661 ALL_OBJFILE_MSYMBOLS (objfile, msym)
662 if (SYMBOL_SECTION (msym) >= 0)
663 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
665 /* Relocating different sections by different amounts may cause the symbols
666 to be out of order. */
667 msymbols_sort (objfile);
669 if (objfile->ei.entry_point != ~(CORE_ADDR) 0)
671 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
672 only as a fallback. */
673 struct obj_section *s;
674 s = find_pc_section (objfile->ei.entry_point);
676 objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index);
678 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
683 for (i = 0; i < objfile->num_sections; ++i)
684 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
687 /* Rebuild section map next time we need it. */
688 objfiles_changed_p = 1;
690 /* Update the table in exec_ops, used to read memory. */
691 ALL_OBJFILE_OSECTIONS (objfile, s)
693 int idx = s->the_bfd_section->index;
695 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
696 obj_section_addr (s));
699 /* Relocate breakpoints as necessary, after things are relocated. */
700 breakpoint_re_set ();
703 /* Many places in gdb want to test just to see if we have any partial
704 symbols available. This function returns zero if none are currently
705 available, nonzero otherwise. */
708 have_partial_symbols (void)
714 if (ofp->psymtabs != NULL)
722 /* Many places in gdb want to test just to see if we have any full
723 symbols available. This function returns zero if none are currently
724 available, nonzero otherwise. */
727 have_full_symbols (void)
733 if (ofp->symtabs != NULL)
742 /* This operations deletes all objfile entries that represent solibs that
743 weren't explicitly loaded by the user, via e.g., the add-symbol-file
747 objfile_purge_solibs (void)
749 struct objfile *objf;
750 struct objfile *temp;
752 ALL_OBJFILES_SAFE (objf, temp)
754 /* We assume that the solib package has been purged already, or will
757 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
763 /* Many places in gdb want to test just to see if we have any minimal
764 symbols available. This function returns zero if none are currently
765 available, nonzero otherwise. */
768 have_minimal_symbols (void)
774 if (ofp->minimal_symbol_count > 0)
782 /* Qsort comparison function. */
785 qsort_cmp (const void *a, const void *b)
787 const struct obj_section *sect1 = *(const struct obj_section **) a;
788 const struct obj_section *sect2 = *(const struct obj_section **) b;
789 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
790 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
792 if (sect1_addr < sect2_addr)
794 gdb_assert (obj_section_endaddr (sect1) <= sect2_addr);
797 else if (sect1_addr > sect2_addr)
799 gdb_assert (sect1_addr >= obj_section_endaddr (sect2));
806 /* Select "better" obj_section to keep. We prefer the one that came from
807 the real object, rather than the one from separate debuginfo.
808 Most of the time the two sections are exactly identical, but with
809 prelinking the .rel.dyn section in the real object may have different
812 static struct obj_section *
813 preferred_obj_section (struct obj_section *a, struct obj_section *b)
815 gdb_assert (obj_section_addr (a) == obj_section_addr (b));
816 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile)
817 || (b->objfile->separate_debug_objfile == a->objfile));
818 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile)
819 || (b->objfile->separate_debug_objfile_backlink == a->objfile));
821 if (a->objfile->separate_debug_objfile != NULL)
826 /* Update PMAP, PMAP_SIZE with non-TLS sections from all objfiles. */
829 update_section_map (struct obj_section ***pmap, int *pmap_size)
832 struct obj_section *s, **map;
833 struct objfile *objfile;
835 gdb_assert (objfiles_changed_p != 0);
840 #define insert_p(objf, sec) \
841 ((bfd_get_section_flags ((objf)->obfd, (sec)->the_bfd_section) \
842 & SEC_THREAD_LOCAL) == 0)
845 ALL_OBJSECTIONS (objfile, s)
846 if (insert_p (objfile, s))
849 map = xmalloc (map_size * sizeof (*map));
852 ALL_OBJSECTIONS (objfile, s)
853 if (insert_p (objfile, s))
858 qsort (map, map_size, sizeof (*map), qsort_cmp);
860 /* With separate debuginfo files, we may have up to two (almost)
861 identical copies of some obj_sections in the map.
862 Filter out duplicates. */
863 for (i = 0, j = 0; i < map_size; ++i)
865 struct obj_section *sect1 = map[i];
866 struct obj_section *sect2 = (i + 1 < map_size) ? map[i + 1] : NULL;
869 || obj_section_addr (sect1) != obj_section_addr (sect2))
873 map[j++] = preferred_obj_section (sect1, sect2);
880 /* Some duplicates were eliminated.
881 The new size shouldn't be less than half of the original. */
882 gdb_assert (map_size / 2 <= j);
885 map = xrealloc (map, map_size * sizeof (*map)); /* Trim excess space. */
888 gdb_assert (j == map_size);
891 *pmap_size = map_size;
894 /* Bsearch comparison function. */
897 bsearch_cmp (const void *key, const void *elt)
899 const CORE_ADDR pc = *(CORE_ADDR *) key;
900 const struct obj_section *section = *(const struct obj_section **) elt;
902 if (pc < obj_section_addr (section))
904 if (pc < obj_section_endaddr (section))
909 /* Returns a section whose range includes PC or NULL if none found. */
912 find_pc_section (CORE_ADDR pc)
914 static struct obj_section **sections;
915 static int num_sections;
917 struct obj_section *s, **sp;
919 /* Check for mapped overlay section first. */
920 s = find_pc_mapped_section (pc);
924 if (objfiles_changed_p != 0)
926 update_section_map (§ions, &num_sections);
928 /* Don't need updates to section map until objfiles are added
930 objfiles_changed_p = 0;
933 sp = (struct obj_section **) bsearch (&pc, sections, num_sections,
934 sizeof (*sections), bsearch_cmp);
941 /* In SVR4, we recognize a trampoline by it's section name.
942 That is, if the pc is in a section named ".plt" then we are in
946 in_plt_section (CORE_ADDR pc, char *name)
948 struct obj_section *s;
951 s = find_pc_section (pc);
954 && s->the_bfd_section->name != NULL
955 && strcmp (s->the_bfd_section->name, ".plt") == 0);
960 /* Keep a registry of per-objfile data-pointers required by other GDB
966 void (*cleanup) (struct objfile *, void *);
969 struct objfile_data_registration
971 struct objfile_data *data;
972 struct objfile_data_registration *next;
975 struct objfile_data_registry
977 struct objfile_data_registration *registrations;
978 unsigned num_registrations;
981 static struct objfile_data_registry objfile_data_registry = { NULL, 0 };
983 const struct objfile_data *
984 register_objfile_data_with_cleanup (void (*cleanup) (struct objfile *, void *))
986 struct objfile_data_registration **curr;
988 /* Append new registration. */
989 for (curr = &objfile_data_registry.registrations;
990 *curr != NULL; curr = &(*curr)->next);
992 *curr = XMALLOC (struct objfile_data_registration);
993 (*curr)->next = NULL;
994 (*curr)->data = XMALLOC (struct objfile_data);
995 (*curr)->data->index = objfile_data_registry.num_registrations++;
996 (*curr)->data->cleanup = cleanup;
998 return (*curr)->data;
1001 const struct objfile_data *
1002 register_objfile_data (void)
1004 return register_objfile_data_with_cleanup (NULL);
1008 objfile_alloc_data (struct objfile *objfile)
1010 gdb_assert (objfile->data == NULL);
1011 objfile->num_data = objfile_data_registry.num_registrations;
1012 objfile->data = XCALLOC (objfile->num_data, void *);
1016 objfile_free_data (struct objfile *objfile)
1018 gdb_assert (objfile->data != NULL);
1019 clear_objfile_data (objfile);
1020 xfree (objfile->data);
1021 objfile->data = NULL;
1025 clear_objfile_data (struct objfile *objfile)
1027 struct objfile_data_registration *registration;
1030 gdb_assert (objfile->data != NULL);
1032 for (registration = objfile_data_registry.registrations, i = 0;
1033 i < objfile->num_data;
1034 registration = registration->next, i++)
1035 if (objfile->data[i] != NULL && registration->data->cleanup)
1036 registration->data->cleanup (objfile, objfile->data[i]);
1038 memset (objfile->data, 0, objfile->num_data * sizeof (void *));
1042 set_objfile_data (struct objfile *objfile, const struct objfile_data *data,
1045 gdb_assert (data->index < objfile->num_data);
1046 objfile->data[data->index] = value;
1050 objfile_data (struct objfile *objfile, const struct objfile_data *data)
1052 gdb_assert (data->index < objfile->num_data);
1053 return objfile->data[data->index];
1056 /* Set objfiles_changed_p so section map will be rebuilt next time it
1057 is used. Called by reread_symbols. */
1060 objfiles_changed (void)
1062 objfiles_changed_p = 1; /* Rebuild section map next time we need it. */
1065 /* Add reference to ABFD. Returns ABFD. */
1067 gdb_bfd_ref (struct bfd *abfd)
1069 int *p_refcount = bfd_usrdata (abfd);
1071 if (p_refcount != NULL)
1077 p_refcount = xmalloc (sizeof (*p_refcount));
1079 bfd_usrdata (abfd) = p_refcount;
1084 /* Unreference and possibly close ABFD. */
1086 gdb_bfd_unref (struct bfd *abfd)
1094 p_refcount = bfd_usrdata (abfd);
1096 /* Valid range for p_refcount: a pointer to int counter, which has a
1097 value of 1 (single owner) or 2 (shared). */
1098 gdb_assert (*p_refcount == 1 || *p_refcount == 2);
1101 if (*p_refcount > 0)
1105 bfd_usrdata (abfd) = NULL; /* Paranoia. */
1107 name = bfd_get_filename (abfd);
1108 if (!bfd_close (abfd))
1109 warning (_("cannot close \"%s\": %s"),
1110 name, bfd_errmsg (bfd_get_error ()));