1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2014 Free Software Foundation, Inc.
5 Contributed by Cygnus Support, using pieces from other GDB modules.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* This file contains support routines for creating, manipulating, and
23 destroying objfile structures. */
26 #include "bfd.h" /* Binary File Description */
30 #include "gdb-stabs.h"
33 #include "expression.h"
34 #include "parser-defs.h"
36 #include "gdb_assert.h"
37 #include <sys/types.h>
40 #include "gdb_obstack.h"
44 #include "breakpoint.h"
46 #include "dictionary.h"
49 #include "arch-utils.h"
52 #include "complaints.h"
58 /* Keep a registry of per-objfile data-pointers required by other GDB
61 DEFINE_REGISTRY (objfile, REGISTRY_ACCESS_FIELD)
63 /* Externally visible variables that are owned by this module.
64 See declarations in objfile.h for more info. */
66 struct objfile_pspace_info
68 struct obj_section **sections;
71 /* Nonzero if object files have been added since the section map
73 int new_objfiles_available;
75 /* Nonzero if the section map MUST be updated before use. */
76 int section_map_dirty;
78 /* Nonzero if section map updates should be inhibited if possible. */
82 /* Per-program-space data key. */
83 static const struct program_space_data *objfiles_pspace_data;
86 objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg)
88 struct objfile_pspace_info *info = arg;
90 xfree (info->sections);
94 /* Get the current svr4 data. If none is found yet, add it now. This
95 function always returns a valid object. */
97 static struct objfile_pspace_info *
98 get_objfile_pspace_data (struct program_space *pspace)
100 struct objfile_pspace_info *info;
102 info = program_space_data (pspace, objfiles_pspace_data);
105 info = XCNEW (struct objfile_pspace_info);
106 set_program_space_data (pspace, objfiles_pspace_data, info);
114 /* Per-BFD data key. */
116 static const struct bfd_data *objfiles_bfd_data;
118 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
119 NULL, and it already has a per-BFD storage object, use that.
120 Otherwise, allocate a new per-BFD storage object. If ABFD is not
121 NULL, the object is allocated on the BFD; otherwise it is allocated
122 on OBJFILE's obstack. Note that it is not safe to call this
123 multiple times for a given OBJFILE -- it can only be called when
124 allocating or re-initializing OBJFILE. */
126 static struct objfile_per_bfd_storage *
127 get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
129 struct objfile_per_bfd_storage *storage = NULL;
132 storage = bfd_data (abfd, objfiles_bfd_data);
136 /* If the object requires gdb to do relocations, we simply fall
137 back to not sharing data across users. These cases are rare
138 enough that this seems reasonable. */
139 if (abfd != NULL && !gdb_bfd_requires_relocations (abfd))
141 storage = bfd_zalloc (abfd, sizeof (struct objfile_per_bfd_storage));
142 set_bfd_data (abfd, objfiles_bfd_data, storage);
145 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
146 struct objfile_per_bfd_storage);
148 /* Look up the gdbarch associated with the BFD. */
150 storage->gdbarch = gdbarch_from_bfd (abfd);
152 obstack_init (&storage->storage_obstack);
153 storage->filename_cache = bcache_xmalloc (NULL, NULL);
154 storage->macro_cache = bcache_xmalloc (NULL, NULL);
155 storage->language_of_main = language_unknown;
164 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage *storage)
166 bcache_xfree (storage->filename_cache);
167 bcache_xfree (storage->macro_cache);
168 if (storage->demangled_names_hash)
169 htab_delete (storage->demangled_names_hash);
170 obstack_free (&storage->storage_obstack, 0);
173 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
174 cleanup function to the BFD registry. */
177 objfile_bfd_data_free (struct bfd *unused, void *d)
179 free_objfile_per_bfd_storage (d);
182 /* See objfiles.h. */
185 set_objfile_per_bfd (struct objfile *objfile)
187 objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
190 /* Set the objfile's per-BFD notion of the "main" name and
194 set_objfile_main_name (struct objfile *objfile,
195 const char *name, enum language lang)
197 if (objfile->per_bfd->name_of_main == NULL
198 || strcmp (objfile->per_bfd->name_of_main, name) != 0)
199 objfile->per_bfd->name_of_main
200 = obstack_copy0 (&objfile->per_bfd->storage_obstack, name, strlen (name));
201 objfile->per_bfd->language_of_main = lang;
206 /* Called via bfd_map_over_sections to build up the section table that
207 the objfile references. The objfile contains pointers to the start
208 of the table (objfile->sections) and to the first location after
209 the end of the table (objfile->sections_end). */
212 add_to_objfile_sections_full (struct bfd *abfd, struct bfd_section *asect,
213 struct objfile *objfile, int force)
215 struct obj_section *section;
221 aflag = bfd_get_section_flags (abfd, asect);
222 if (!(aflag & SEC_ALLOC))
226 section = &objfile->sections[gdb_bfd_section_index (abfd, asect)];
227 section->objfile = objfile;
228 section->the_bfd_section = asect;
229 section->ovly_mapped = 0;
233 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
236 add_to_objfile_sections_full (abfd, asect, objfilep, 0);
239 /* Builds a section table for OBJFILE.
241 Note that the OFFSET and OVLY_MAPPED in each table entry are
242 initialized to zero. */
245 build_objfile_section_table (struct objfile *objfile)
247 int count = gdb_bfd_count_sections (objfile->obfd);
249 objfile->sections = OBSTACK_CALLOC (&objfile->objfile_obstack,
252 objfile->sections_end = (objfile->sections + count);
253 bfd_map_over_sections (objfile->obfd,
254 add_to_objfile_sections, (void *) objfile);
256 /* See gdb_bfd_section_index. */
257 add_to_objfile_sections_full (objfile->obfd, bfd_com_section_ptr, objfile, 1);
258 add_to_objfile_sections_full (objfile->obfd, bfd_und_section_ptr, objfile, 1);
259 add_to_objfile_sections_full (objfile->obfd, bfd_abs_section_ptr, objfile, 1);
260 add_to_objfile_sections_full (objfile->obfd, bfd_ind_section_ptr, objfile, 1);
263 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
264 allocate a new objfile struct, fill it in as best we can, link it
265 into the list of all known objfiles, and return a pointer to the
268 NAME should contain original non-canonicalized filename or other
269 identifier as entered by user. If there is no better source use
270 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
271 NAME content is copied into returned objfile.
273 The FLAGS word contains various bits (OBJF_*) that can be taken as
274 requests for specific operations. Other bits like OBJF_SHARED are
275 simply copied through to the new objfile flags member. */
277 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
278 by jv-lang.c, to create an artificial objfile used to hold
279 information about dynamically-loaded Java classes. Unfortunately,
280 that branch of this function doesn't get tested very frequently, so
281 it's prone to breakage. (E.g. at one time the name was set to NULL
282 in that situation, which broke a loop over all names in the dynamic
283 library loader.) If you change this function, please try to leave
284 things in a consistent state even if abfd is NULL. */
287 allocate_objfile (bfd *abfd, const char *name, int flags)
289 struct objfile *objfile;
292 objfile = (struct objfile *) xzalloc (sizeof (struct objfile));
293 objfile->psymbol_cache = psymbol_bcache_init ();
294 /* We could use obstack_specify_allocation here instead, but
295 gdb_obstack.h specifies the alloc/dealloc functions. */
296 obstack_init (&objfile->objfile_obstack);
297 terminate_minimal_symbol_table (objfile);
299 objfile_alloc_data (objfile);
303 gdb_assert (abfd == NULL);
304 gdb_assert ((flags & OBJF_NOT_FILENAME) != 0);
305 expanded_name = xstrdup ("<<anonymous objfile>>");
307 else if ((flags & OBJF_NOT_FILENAME) != 0)
308 expanded_name = xstrdup (name);
310 expanded_name = gdb_abspath (name);
311 objfile->original_name = obstack_copy0 (&objfile->objfile_obstack,
313 strlen (expanded_name));
314 xfree (expanded_name);
316 /* Update the per-objfile information that comes from the bfd, ensuring
317 that any data that is reference is saved in the per-objfile data
320 /* Update the per-objfile information that comes from the bfd, ensuring
321 that any data that is reference is saved in the per-objfile data
324 objfile->obfd = abfd;
328 objfile->mtime = bfd_get_mtime (abfd);
330 /* Build section table. */
331 build_objfile_section_table (objfile);
334 objfile->per_bfd = get_objfile_bfd_data (objfile, abfd);
335 objfile->pspace = current_program_space;
337 /* Initialize the section indexes for this objfile, so that we can
338 later detect if they are used w/o being properly assigned to. */
340 objfile->sect_index_text = -1;
341 objfile->sect_index_data = -1;
342 objfile->sect_index_bss = -1;
343 objfile->sect_index_rodata = -1;
345 /* Add this file onto the tail of the linked list of other such files. */
347 objfile->next = NULL;
348 if (object_files == NULL)
349 object_files = objfile;
352 struct objfile *last_one;
354 for (last_one = object_files;
356 last_one = last_one->next);
357 last_one->next = objfile;
360 /* Save passed in flag bits. */
361 objfile->flags |= flags;
363 /* Rebuild section map next time we need it. */
364 get_objfile_pspace_data (objfile->pspace)->new_objfiles_available = 1;
369 /* Retrieve the gdbarch associated with OBJFILE. */
371 get_objfile_arch (struct objfile *objfile)
373 return objfile->per_bfd->gdbarch;
376 /* If there is a valid and known entry point, function fills *ENTRY_P with it
377 and returns non-zero; otherwise it returns zero. */
380 entry_point_address_query (CORE_ADDR *entry_p)
382 if (symfile_objfile == NULL || !symfile_objfile->per_bfd->ei.entry_point_p)
385 *entry_p = (symfile_objfile->per_bfd->ei.entry_point
386 + ANOFFSET (symfile_objfile->section_offsets,
387 symfile_objfile->per_bfd->ei.the_bfd_section_index));
392 /* Get current entry point address. Call error if it is not known. */
395 entry_point_address (void)
399 if (!entry_point_address_query (&retval))
400 error (_("Entry point address is not known."));
405 /* Iterator on PARENT and every separate debug objfile of PARENT.
406 The usage pattern is:
407 for (objfile = parent;
409 objfile = objfile_separate_debug_iterate (parent, objfile))
414 objfile_separate_debug_iterate (const struct objfile *parent,
415 const struct objfile *objfile)
419 /* If any, return the first child. */
420 res = objfile->separate_debug_objfile;
424 /* Common case where there is no separate debug objfile. */
425 if (objfile == parent)
428 /* Return the brother if any. Note that we don't iterate on brothers of
430 res = objfile->separate_debug_objfile_link;
434 for (res = objfile->separate_debug_objfile_backlink;
436 res = res->separate_debug_objfile_backlink)
438 gdb_assert (res != NULL);
439 if (res->separate_debug_objfile_link)
440 return res->separate_debug_objfile_link;
445 /* Put one object file before a specified on in the global list.
446 This can be used to make sure an object file is destroyed before
447 another when using ALL_OBJFILES_SAFE to free all objfiles. */
449 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
451 struct objfile **objp;
453 unlink_objfile (objfile);
455 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
457 if (*objp == before_this)
459 objfile->next = *objp;
465 internal_error (__FILE__, __LINE__,
466 _("put_objfile_before: before objfile not in list"));
469 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
472 It is not a bug, or error, to call this function if OBJFILE is not known
473 to be in the current list. This is done in the case of mapped objfiles,
474 for example, just to ensure that the mapped objfile doesn't appear twice
475 in the list. Since the list is threaded, linking in a mapped objfile
476 twice would create a circular list.
478 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
479 unlinking it, just to ensure that we have completely severed any linkages
480 between the OBJFILE and the list. */
483 unlink_objfile (struct objfile *objfile)
485 struct objfile **objpp;
487 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
489 if (*objpp == objfile)
491 *objpp = (*objpp)->next;
492 objfile->next = NULL;
497 internal_error (__FILE__, __LINE__,
498 _("unlink_objfile: objfile already unlinked"));
501 /* Add OBJFILE as a separate debug objfile of PARENT. */
504 add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent)
506 gdb_assert (objfile && parent);
508 /* Must not be already in a list. */
509 gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
510 gdb_assert (objfile->separate_debug_objfile_link == NULL);
511 gdb_assert (objfile->separate_debug_objfile == NULL);
512 gdb_assert (parent->separate_debug_objfile_backlink == NULL);
513 gdb_assert (parent->separate_debug_objfile_link == NULL);
515 objfile->separate_debug_objfile_backlink = parent;
516 objfile->separate_debug_objfile_link = parent->separate_debug_objfile;
517 parent->separate_debug_objfile = objfile;
519 /* Put the separate debug object before the normal one, this is so that
520 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
521 put_objfile_before (objfile, parent);
524 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
528 free_objfile_separate_debug (struct objfile *objfile)
530 struct objfile *child;
532 for (child = objfile->separate_debug_objfile; child;)
534 struct objfile *next_child = child->separate_debug_objfile_link;
535 free_objfile (child);
540 /* Destroy an objfile and all the symtabs and psymtabs under it. */
543 free_objfile (struct objfile *objfile)
545 /* First notify observers that this objfile is about to be freed. */
546 observer_notify_free_objfile (objfile);
548 /* Free all separate debug objfiles. */
549 free_objfile_separate_debug (objfile);
551 if (objfile->separate_debug_objfile_backlink)
553 /* We freed the separate debug file, make sure the base objfile
554 doesn't reference it. */
555 struct objfile *child;
557 child = objfile->separate_debug_objfile_backlink->separate_debug_objfile;
559 if (child == objfile)
561 /* OBJFILE is the first child. */
562 objfile->separate_debug_objfile_backlink->separate_debug_objfile =
563 objfile->separate_debug_objfile_link;
567 /* Find OBJFILE in the list. */
570 if (child->separate_debug_objfile_link == objfile)
572 child->separate_debug_objfile_link =
573 objfile->separate_debug_objfile_link;
576 child = child->separate_debug_objfile_link;
582 /* Remove any references to this objfile in the global value
584 preserve_values (objfile);
586 /* It still may reference data modules have associated with the objfile and
587 the symbol file data. */
588 forget_cached_source_info_for_objfile (objfile);
590 breakpoint_free_objfile (objfile);
591 btrace_free_objfile (objfile);
593 /* First do any symbol file specific actions required when we are
594 finished with a particular symbol file. Note that if the objfile
595 is using reusable symbol information (via mmalloc) then each of
596 these routines is responsible for doing the correct thing, either
597 freeing things which are valid only during this particular gdb
598 execution, or leaving them to be reused during the next one. */
600 if (objfile->sf != NULL)
602 (*objfile->sf->sym_finish) (objfile);
605 /* Discard any data modules have associated with the objfile. The function
606 still may reference objfile->obfd. */
607 objfile_free_data (objfile);
610 gdb_bfd_unref (objfile->obfd);
612 free_objfile_per_bfd_storage (objfile->per_bfd);
614 /* Remove it from the chain of all objfiles. */
616 unlink_objfile (objfile);
618 if (objfile == symfile_objfile)
619 symfile_objfile = NULL;
621 /* Before the symbol table code was redone to make it easier to
622 selectively load and remove information particular to a specific
623 linkage unit, gdb used to do these things whenever the monolithic
624 symbol table was blown away. How much still needs to be done
625 is unknown, but we play it safe for now and keep each action until
626 it is shown to be no longer needed. */
628 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
629 for example), so we need to call this here. */
630 clear_pc_function_cache ();
632 /* Clear globals which might have pointed into a removed objfile.
633 FIXME: It's not clear which of these are supposed to persist
634 between expressions and which ought to be reset each time. */
635 expression_context_block = NULL;
636 innermost_block = NULL;
638 /* Check to see if the current_source_symtab belongs to this objfile,
639 and if so, call clear_current_source_symtab_and_line. */
642 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
644 if (cursal.symtab && cursal.symtab->objfile == objfile)
645 clear_current_source_symtab_and_line ();
648 if (objfile->global_psymbols.list)
649 xfree (objfile->global_psymbols.list);
650 if (objfile->static_psymbols.list)
651 xfree (objfile->static_psymbols.list);
652 /* Free the obstacks for non-reusable objfiles. */
653 psymbol_bcache_free (objfile->psymbol_cache);
654 obstack_free (&objfile->objfile_obstack, 0);
656 /* Rebuild section map next time we need it. */
657 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
659 /* The last thing we do is free the objfile struct itself. */
664 do_free_objfile_cleanup (void *obj)
670 make_cleanup_free_objfile (struct objfile *obj)
672 return make_cleanup (do_free_objfile_cleanup, obj);
675 /* Free all the object files at once and clean up their users. */
678 free_all_objfiles (void)
680 struct objfile *objfile, *temp;
683 /* Any objfile referencewould become stale. */
684 for (so = master_so_list (); so; so = so->next)
685 gdb_assert (so->objfile == NULL);
687 ALL_OBJFILES_SAFE (objfile, temp)
689 free_objfile (objfile);
691 clear_symtab_users (0);
694 /* A helper function for objfile_relocate1 that relocates a single
698 relocate_one_symbol (struct symbol *sym, struct objfile *objfile,
699 struct section_offsets *delta)
701 fixup_symbol_section (sym, objfile);
703 /* The RS6000 code from which this was taken skipped
704 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
705 But I'm leaving out that test, on the theory that
706 they can't possibly pass the tests below. */
707 if ((SYMBOL_CLASS (sym) == LOC_LABEL
708 || SYMBOL_CLASS (sym) == LOC_STATIC)
709 && SYMBOL_SECTION (sym) >= 0)
711 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
715 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
716 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
717 Return non-zero iff any change happened. */
720 objfile_relocate1 (struct objfile *objfile,
721 const struct section_offsets *new_offsets)
723 struct obj_section *s;
724 struct section_offsets *delta =
725 ((struct section_offsets *)
726 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
729 int something_changed = 0;
731 for (i = 0; i < objfile->num_sections; ++i)
734 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
735 if (ANOFFSET (delta, i) != 0)
736 something_changed = 1;
738 if (!something_changed)
741 /* OK, get all the symtabs. */
745 ALL_OBJFILE_SYMTABS (objfile, s)
748 struct blockvector *bv;
751 /* First the line table. */
755 for (i = 0; i < l->nitems; ++i)
756 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
759 /* Don't relocate a shared blockvector more than once. */
763 bv = BLOCKVECTOR (s);
764 if (BLOCKVECTOR_MAP (bv))
765 addrmap_relocate (BLOCKVECTOR_MAP (bv),
766 ANOFFSET (delta, s->block_line_section));
768 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
772 struct dict_iterator iter;
774 b = BLOCKVECTOR_BLOCK (bv, i);
775 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
776 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
778 /* We only want to iterate over the local symbols, not any
779 symbols in included symtabs. */
780 ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym)
782 relocate_one_symbol (sym, objfile, delta);
788 /* Relocate isolated symbols. */
792 for (iter = objfile->template_symbols; iter; iter = iter->hash_next)
793 relocate_one_symbol (iter, objfile, delta);
796 if (objfile->psymtabs_addrmap)
797 addrmap_relocate (objfile->psymtabs_addrmap,
798 ANOFFSET (delta, SECT_OFF_TEXT (objfile)));
801 objfile->sf->qf->relocate (objfile, new_offsets, delta);
804 struct minimal_symbol *msym;
806 ALL_OBJFILE_MSYMBOLS (objfile, msym)
807 if (MSYMBOL_SECTION (msym) >= 0)
808 SET_MSYMBOL_VALUE_ADDRESS (msym, (MSYMBOL_VALUE_ADDRESS (msym)
810 MSYMBOL_SECTION (msym))));
812 /* Relocating different sections by different amounts may cause the symbols
813 to be out of order. */
814 msymbols_sort (objfile);
819 for (i = 0; i < objfile->num_sections; ++i)
820 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
823 /* Rebuild section map next time we need it. */
824 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
826 /* Update the table in exec_ops, used to read memory. */
827 ALL_OBJFILE_OSECTIONS (objfile, s)
829 int idx = s - objfile->sections;
831 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
832 obj_section_addr (s));
835 /* Relocating probes. */
836 if (objfile->sf && objfile->sf->sym_probe_fns)
837 objfile->sf->sym_probe_fns->sym_relocate_probe (objfile,
844 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
845 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
847 The number and ordering of sections does differ between the two objfiles.
848 Only their names match. Also the file offsets will differ (objfile being
849 possibly prelinked but separate_debug_objfile is probably not prelinked) but
850 the in-memory absolute address as specified by NEW_OFFSETS must match both
854 objfile_relocate (struct objfile *objfile,
855 const struct section_offsets *new_offsets)
857 struct objfile *debug_objfile;
860 changed |= objfile_relocate1 (objfile, new_offsets);
862 for (debug_objfile = objfile->separate_debug_objfile;
864 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
866 struct section_addr_info *objfile_addrs;
867 struct section_offsets *new_debug_offsets;
868 struct cleanup *my_cleanups;
870 objfile_addrs = build_section_addr_info_from_objfile (objfile);
871 my_cleanups = make_cleanup (xfree, objfile_addrs);
873 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
874 relative ones must be already created according to debug_objfile. */
876 addr_info_make_relative (objfile_addrs, debug_objfile->obfd);
878 gdb_assert (debug_objfile->num_sections
879 == gdb_bfd_count_sections (debug_objfile->obfd));
881 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections));
882 make_cleanup (xfree, new_debug_offsets);
883 relative_addr_info_to_section_offsets (new_debug_offsets,
884 debug_objfile->num_sections,
887 changed |= objfile_relocate1 (debug_objfile, new_debug_offsets);
889 do_cleanups (my_cleanups);
892 /* Relocate breakpoints as necessary, after things are relocated. */
894 breakpoint_re_set ();
897 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
899 Return non-zero iff any change happened. */
902 objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
904 struct section_offsets *new_offsets =
905 ((struct section_offsets *)
906 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
909 for (i = 0; i < objfile->num_sections; ++i)
910 new_offsets->offsets[i] = slide;
912 return objfile_relocate1 (objfile, new_offsets);
915 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
916 SEPARATE_DEBUG_OBJFILEs. */
919 objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
921 struct objfile *debug_objfile;
924 changed |= objfile_rebase1 (objfile, slide);
926 for (debug_objfile = objfile->separate_debug_objfile;
928 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
929 changed |= objfile_rebase1 (debug_objfile, slide);
931 /* Relocate breakpoints as necessary, after things are relocated. */
933 breakpoint_re_set ();
936 /* Return non-zero if OBJFILE has partial symbols. */
939 objfile_has_partial_symbols (struct objfile *objfile)
944 /* If we have not read psymbols, but we have a function capable of reading
945 them, then that is an indication that they are in fact available. Without
946 this function the symbols may have been already read in but they also may
947 not be present in this objfile. */
948 if ((objfile->flags & OBJF_PSYMTABS_READ) == 0
949 && objfile->sf->sym_read_psymbols != NULL)
952 return objfile->sf->qf->has_symbols (objfile);
955 /* Return non-zero if OBJFILE has full symbols. */
958 objfile_has_full_symbols (struct objfile *objfile)
960 return objfile->symtabs != NULL;
963 /* Return non-zero if OBJFILE has full or partial symbols, either directly
964 or through a separate debug file. */
967 objfile_has_symbols (struct objfile *objfile)
971 for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o))
972 if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o))
978 /* Many places in gdb want to test just to see if we have any partial
979 symbols available. This function returns zero if none are currently
980 available, nonzero otherwise. */
983 have_partial_symbols (void)
989 if (objfile_has_partial_symbols (ofp))
995 /* Many places in gdb want to test just to see if we have any full
996 symbols available. This function returns zero if none are currently
997 available, nonzero otherwise. */
1000 have_full_symbols (void)
1002 struct objfile *ofp;
1006 if (objfile_has_full_symbols (ofp))
1013 /* This operations deletes all objfile entries that represent solibs that
1014 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1018 objfile_purge_solibs (void)
1020 struct objfile *objf;
1021 struct objfile *temp;
1023 ALL_OBJFILES_SAFE (objf, temp)
1025 /* We assume that the solib package has been purged already, or will
1028 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
1029 free_objfile (objf);
1034 /* Many places in gdb want to test just to see if we have any minimal
1035 symbols available. This function returns zero if none are currently
1036 available, nonzero otherwise. */
1039 have_minimal_symbols (void)
1041 struct objfile *ofp;
1045 if (ofp->minimal_symbol_count > 0)
1053 /* Qsort comparison function. */
1056 qsort_cmp (const void *a, const void *b)
1058 const struct obj_section *sect1 = *(const struct obj_section **) a;
1059 const struct obj_section *sect2 = *(const struct obj_section **) b;
1060 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1061 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1063 if (sect1_addr < sect2_addr)
1065 else if (sect1_addr > sect2_addr)
1069 /* Sections are at the same address. This could happen if
1070 A) we have an objfile and a separate debuginfo.
1071 B) we are confused, and have added sections without proper relocation,
1072 or something like that. */
1074 const struct objfile *const objfile1 = sect1->objfile;
1075 const struct objfile *const objfile2 = sect2->objfile;
1077 if (objfile1->separate_debug_objfile == objfile2
1078 || objfile2->separate_debug_objfile == objfile1)
1080 /* Case A. The ordering doesn't matter: separate debuginfo files
1081 will be filtered out later. */
1086 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1087 triage. This section could be slow (since we iterate over all
1088 objfiles in each call to qsort_cmp), but this shouldn't happen
1089 very often (GDB is already in a confused state; one hopes this
1090 doesn't happen at all). If you discover that significant time is
1091 spent in the loops below, do 'set complaints 100' and examine the
1092 resulting complaints. */
1094 if (objfile1 == objfile2)
1096 /* Both sections came from the same objfile. We are really confused.
1097 Sort on sequence order of sections within the objfile. */
1099 const struct obj_section *osect;
1101 ALL_OBJFILE_OSECTIONS (objfile1, osect)
1104 else if (osect == sect2)
1107 /* We should have found one of the sections before getting here. */
1108 gdb_assert_not_reached ("section not found");
1112 /* Sort on sequence number of the objfile in the chain. */
1114 const struct objfile *objfile;
1116 ALL_OBJFILES (objfile)
1117 if (objfile == objfile1)
1119 else if (objfile == objfile2)
1122 /* We should have found one of the objfiles before getting here. */
1123 gdb_assert_not_reached ("objfile not found");
1128 gdb_assert_not_reached ("unexpected code path");
1132 /* Select "better" obj_section to keep. We prefer the one that came from
1133 the real object, rather than the one from separate debuginfo.
1134 Most of the time the two sections are exactly identical, but with
1135 prelinking the .rel.dyn section in the real object may have different
1138 static struct obj_section *
1139 preferred_obj_section (struct obj_section *a, struct obj_section *b)
1141 gdb_assert (obj_section_addr (a) == obj_section_addr (b));
1142 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile)
1143 || (b->objfile->separate_debug_objfile == a->objfile));
1144 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile)
1145 || (b->objfile->separate_debug_objfile_backlink == a->objfile));
1147 if (a->objfile->separate_debug_objfile != NULL)
1152 /* Return 1 if SECTION should be inserted into the section map.
1153 We want to insert only non-overlay and non-TLS section. */
1156 insert_section_p (const struct bfd *abfd,
1157 const struct bfd_section *section)
1159 const bfd_vma lma = bfd_section_lma (abfd, section);
1161 if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section)
1162 && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0)
1163 /* This is an overlay section. IN_MEMORY check is needed to avoid
1164 discarding sections from the "system supplied DSO" (aka vdso)
1165 on some Linux systems (e.g. Fedora 11). */
1167 if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0)
1168 /* This is a TLS section. */
1174 /* Filter out overlapping sections where one section came from the real
1175 objfile, and the other from a separate debuginfo file.
1176 Return the size of table after redundant sections have been eliminated. */
1179 filter_debuginfo_sections (struct obj_section **map, int map_size)
1183 for (i = 0, j = 0; i < map_size - 1; i++)
1185 struct obj_section *const sect1 = map[i];
1186 struct obj_section *const sect2 = map[i + 1];
1187 const struct objfile *const objfile1 = sect1->objfile;
1188 const struct objfile *const objfile2 = sect2->objfile;
1189 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1190 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1192 if (sect1_addr == sect2_addr
1193 && (objfile1->separate_debug_objfile == objfile2
1194 || objfile2->separate_debug_objfile == objfile1))
1196 map[j++] = preferred_obj_section (sect1, sect2);
1205 gdb_assert (i == map_size - 1);
1209 /* The map should not have shrunk to less than half the original size. */
1210 gdb_assert (map_size / 2 <= j);
1215 /* Filter out overlapping sections, issuing a warning if any are found.
1216 Overlapping sections could really be overlay sections which we didn't
1217 classify as such in insert_section_p, or we could be dealing with a
1221 filter_overlapping_sections (struct obj_section **map, int map_size)
1225 for (i = 0, j = 0; i < map_size - 1; )
1230 for (k = i + 1; k < map_size; k++)
1232 struct obj_section *const sect1 = map[i];
1233 struct obj_section *const sect2 = map[k];
1234 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1235 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1236 const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1);
1238 gdb_assert (sect1_addr <= sect2_addr);
1240 if (sect1_endaddr <= sect2_addr)
1244 /* We have an overlap. Report it. */
1246 struct objfile *const objf1 = sect1->objfile;
1247 struct objfile *const objf2 = sect2->objfile;
1249 const struct bfd_section *const bfds1 = sect1->the_bfd_section;
1250 const struct bfd_section *const bfds2 = sect2->the_bfd_section;
1252 const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2);
1254 struct gdbarch *const gdbarch = get_objfile_arch (objf1);
1256 complaint (&symfile_complaints,
1257 _("unexpected overlap between:\n"
1258 " (A) section `%s' from `%s' [%s, %s)\n"
1259 " (B) section `%s' from `%s' [%s, %s).\n"
1260 "Will ignore section B"),
1261 bfd_section_name (abfd1, bfds1), objfile_name (objf1),
1262 paddress (gdbarch, sect1_addr),
1263 paddress (gdbarch, sect1_endaddr),
1264 bfd_section_name (abfd2, bfds2), objfile_name (objf2),
1265 paddress (gdbarch, sect2_addr),
1266 paddress (gdbarch, sect2_endaddr));
1274 gdb_assert (i == map_size - 1);
1282 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1283 TLS, overlay and overlapping sections. */
1286 update_section_map (struct program_space *pspace,
1287 struct obj_section ***pmap, int *pmap_size)
1289 struct objfile_pspace_info *pspace_info;
1290 int alloc_size, map_size, i;
1291 struct obj_section *s, **map;
1292 struct objfile *objfile;
1294 pspace_info = get_objfile_pspace_data (pspace);
1295 gdb_assert (pspace_info->section_map_dirty != 0
1296 || pspace_info->new_objfiles_available != 0);
1302 ALL_PSPACE_OBJFILES (pspace, objfile)
1303 ALL_OBJFILE_OSECTIONS (objfile, s)
1304 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1307 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1308 if (alloc_size == 0)
1315 map = xmalloc (alloc_size * sizeof (*map));
1318 ALL_PSPACE_OBJFILES (pspace, objfile)
1319 ALL_OBJFILE_OSECTIONS (objfile, s)
1320 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1323 qsort (map, alloc_size, sizeof (*map), qsort_cmp);
1324 map_size = filter_debuginfo_sections(map, alloc_size);
1325 map_size = filter_overlapping_sections(map, map_size);
1327 if (map_size < alloc_size)
1328 /* Some sections were eliminated. Trim excess space. */
1329 map = xrealloc (map, map_size * sizeof (*map));
1331 gdb_assert (alloc_size == map_size);
1334 *pmap_size = map_size;
1337 /* Bsearch comparison function. */
1340 bsearch_cmp (const void *key, const void *elt)
1342 const CORE_ADDR pc = *(CORE_ADDR *) key;
1343 const struct obj_section *section = *(const struct obj_section **) elt;
1345 if (pc < obj_section_addr (section))
1347 if (pc < obj_section_endaddr (section))
1352 /* Returns a section whose range includes PC or NULL if none found. */
1354 struct obj_section *
1355 find_pc_section (CORE_ADDR pc)
1357 struct objfile_pspace_info *pspace_info;
1358 struct obj_section *s, **sp;
1360 /* Check for mapped overlay section first. */
1361 s = find_pc_mapped_section (pc);
1365 pspace_info = get_objfile_pspace_data (current_program_space);
1366 if (pspace_info->section_map_dirty
1367 || (pspace_info->new_objfiles_available
1368 && !pspace_info->inhibit_updates))
1370 update_section_map (current_program_space,
1371 &pspace_info->sections,
1372 &pspace_info->num_sections);
1374 /* Don't need updates to section map until objfiles are added,
1375 removed or relocated. */
1376 pspace_info->new_objfiles_available = 0;
1377 pspace_info->section_map_dirty = 0;
1380 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1381 bsearch be non-NULL. */
1382 if (pspace_info->sections == NULL)
1384 gdb_assert (pspace_info->num_sections == 0);
1388 sp = (struct obj_section **) bsearch (&pc,
1389 pspace_info->sections,
1390 pspace_info->num_sections,
1391 sizeof (*pspace_info->sections),
1399 /* Return non-zero if PC is in a section called NAME. */
1402 pc_in_section (CORE_ADDR pc, char *name)
1404 struct obj_section *s;
1407 s = find_pc_section (pc);
1410 && s->the_bfd_section->name != NULL
1411 && strcmp (s->the_bfd_section->name, name) == 0);
1416 /* Set section_map_dirty so section map will be rebuilt next time it
1417 is used. Called by reread_symbols. */
1420 objfiles_changed (void)
1422 /* Rebuild section map next time we need it. */
1423 get_objfile_pspace_data (current_program_space)->section_map_dirty = 1;
1426 /* See comments in objfiles.h. */
1429 inhibit_section_map_updates (struct program_space *pspace)
1431 get_objfile_pspace_data (pspace)->inhibit_updates = 1;
1434 /* See comments in objfiles.h. */
1437 resume_section_map_updates (struct program_space *pspace)
1439 get_objfile_pspace_data (pspace)->inhibit_updates = 0;
1442 /* See comments in objfiles.h. */
1445 resume_section_map_updates_cleanup (void *arg)
1447 resume_section_map_updates (arg);
1450 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1454 is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile)
1456 struct obj_section *osect;
1458 if (objfile == NULL)
1461 ALL_OBJFILE_OSECTIONS (objfile, osect)
1463 if (section_is_overlay (osect) && !section_is_mapped (osect))
1466 if (obj_section_addr (osect) <= addr
1467 && addr < obj_section_endaddr (osect))
1473 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1474 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1475 searching the objfiles in the order they are stored internally,
1476 ignoring CURRENT_OBJFILE.
1478 On most platorms, it should be close enough to doing the best
1479 we can without some knowledge specific to the architecture. */
1482 default_iterate_over_objfiles_in_search_order
1483 (struct gdbarch *gdbarch,
1484 iterate_over_objfiles_in_search_order_cb_ftype *cb,
1485 void *cb_data, struct objfile *current_objfile)
1488 struct objfile *objfile;
1490 ALL_OBJFILES (objfile)
1492 stop = cb (objfile, cb_data);
1498 /* Return canonical name for OBJFILE. */
1501 objfile_name (const struct objfile *objfile)
1503 if (objfile->obfd != NULL)
1504 return bfd_get_filename (objfile->obfd);
1506 return objfile->original_name;
1509 /* Provide a prototype to silence -Wmissing-prototypes. */
1510 extern initialize_file_ftype _initialize_objfiles;
1513 _initialize_objfiles (void)
1515 objfiles_pspace_data
1516 = register_program_space_data_with_cleanup (NULL,
1517 objfiles_pspace_data_cleanup);
1519 objfiles_bfd_data = register_bfd_data_with_cleanup (NULL,
1520 objfile_bfd_data_free);