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 <sys/types.h>
39 #include "gdb_obstack.h"
43 #include "breakpoint.h"
45 #include "dictionary.h"
48 #include "arch-utils.h"
51 #include "complaints.h"
57 /* Keep a registry of per-objfile data-pointers required by other GDB
60 DEFINE_REGISTRY (objfile, REGISTRY_ACCESS_FIELD)
62 /* Externally visible variables that are owned by this module.
63 See declarations in objfile.h for more info. */
65 struct objfile_pspace_info
67 struct obj_section **sections;
70 /* Nonzero if object files have been added since the section map
72 int new_objfiles_available;
74 /* Nonzero if the section map MUST be updated before use. */
75 int section_map_dirty;
77 /* Nonzero if section map updates should be inhibited if possible. */
81 /* Per-program-space data key. */
82 static const struct program_space_data *objfiles_pspace_data;
85 objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg)
87 struct objfile_pspace_info *info = arg;
89 xfree (info->sections);
93 /* Get the current svr4 data. If none is found yet, add it now. This
94 function always returns a valid object. */
96 static struct objfile_pspace_info *
97 get_objfile_pspace_data (struct program_space *pspace)
99 struct objfile_pspace_info *info;
101 info = program_space_data (pspace, objfiles_pspace_data);
104 info = XCNEW (struct objfile_pspace_info);
105 set_program_space_data (pspace, objfiles_pspace_data, info);
113 /* Per-BFD data key. */
115 static const struct bfd_data *objfiles_bfd_data;
117 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
118 NULL, and it already has a per-BFD storage object, use that.
119 Otherwise, allocate a new per-BFD storage object. If ABFD is not
120 NULL, the object is allocated on the BFD; otherwise it is allocated
121 on OBJFILE's obstack. Note that it is not safe to call this
122 multiple times for a given OBJFILE -- it can only be called when
123 allocating or re-initializing OBJFILE. */
125 static struct objfile_per_bfd_storage *
126 get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
128 struct objfile_per_bfd_storage *storage = NULL;
131 storage = bfd_data (abfd, objfiles_bfd_data);
135 /* If the object requires gdb to do relocations, we simply fall
136 back to not sharing data across users. These cases are rare
137 enough that this seems reasonable. */
138 if (abfd != NULL && !gdb_bfd_requires_relocations (abfd))
140 storage = bfd_zalloc (abfd, sizeof (struct objfile_per_bfd_storage));
141 set_bfd_data (abfd, objfiles_bfd_data, storage);
144 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
145 struct objfile_per_bfd_storage);
147 /* Look up the gdbarch associated with the BFD. */
149 storage->gdbarch = gdbarch_from_bfd (abfd);
151 obstack_init (&storage->storage_obstack);
152 storage->filename_cache = bcache_xmalloc (NULL, NULL);
153 storage->macro_cache = bcache_xmalloc (NULL, NULL);
154 storage->language_of_main = language_unknown;
163 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage *storage)
165 bcache_xfree (storage->filename_cache);
166 bcache_xfree (storage->macro_cache);
167 if (storage->demangled_names_hash)
168 htab_delete (storage->demangled_names_hash);
169 obstack_free (&storage->storage_obstack, 0);
172 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
173 cleanup function to the BFD registry. */
176 objfile_bfd_data_free (struct bfd *unused, void *d)
178 free_objfile_per_bfd_storage (d);
181 /* See objfiles.h. */
184 set_objfile_per_bfd (struct objfile *objfile)
186 objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
189 /* Set the objfile's per-BFD notion of the "main" name and
193 set_objfile_main_name (struct objfile *objfile,
194 const char *name, enum language lang)
196 if (objfile->per_bfd->name_of_main == NULL
197 || strcmp (objfile->per_bfd->name_of_main, name) != 0)
198 objfile->per_bfd->name_of_main
199 = obstack_copy0 (&objfile->per_bfd->storage_obstack, name, strlen (name));
200 objfile->per_bfd->language_of_main = lang;
205 /* Called via bfd_map_over_sections to build up the section table that
206 the objfile references. The objfile contains pointers to the start
207 of the table (objfile->sections) and to the first location after
208 the end of the table (objfile->sections_end). */
211 add_to_objfile_sections_full (struct bfd *abfd, struct bfd_section *asect,
212 struct objfile *objfile, int force)
214 struct obj_section *section;
220 aflag = bfd_get_section_flags (abfd, asect);
221 if (!(aflag & SEC_ALLOC))
225 section = &objfile->sections[gdb_bfd_section_index (abfd, asect)];
226 section->objfile = objfile;
227 section->the_bfd_section = asect;
228 section->ovly_mapped = 0;
232 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
235 add_to_objfile_sections_full (abfd, asect, objfilep, 0);
238 /* Builds a section table for OBJFILE.
240 Note that the OFFSET and OVLY_MAPPED in each table entry are
241 initialized to zero. */
244 build_objfile_section_table (struct objfile *objfile)
246 int count = gdb_bfd_count_sections (objfile->obfd);
248 objfile->sections = OBSTACK_CALLOC (&objfile->objfile_obstack,
251 objfile->sections_end = (objfile->sections + count);
252 bfd_map_over_sections (objfile->obfd,
253 add_to_objfile_sections, (void *) objfile);
255 /* See gdb_bfd_section_index. */
256 add_to_objfile_sections_full (objfile->obfd, bfd_com_section_ptr, objfile, 1);
257 add_to_objfile_sections_full (objfile->obfd, bfd_und_section_ptr, objfile, 1);
258 add_to_objfile_sections_full (objfile->obfd, bfd_abs_section_ptr, objfile, 1);
259 add_to_objfile_sections_full (objfile->obfd, bfd_ind_section_ptr, objfile, 1);
262 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
263 allocate a new objfile struct, fill it in as best we can, link it
264 into the list of all known objfiles, and return a pointer to the
267 NAME should contain original non-canonicalized filename or other
268 identifier as entered by user. If there is no better source use
269 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
270 NAME content is copied into returned objfile.
272 The FLAGS word contains various bits (OBJF_*) that can be taken as
273 requests for specific operations. Other bits like OBJF_SHARED are
274 simply copied through to the new objfile flags member. */
276 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
277 by jv-lang.c, to create an artificial objfile used to hold
278 information about dynamically-loaded Java classes. Unfortunately,
279 that branch of this function doesn't get tested very frequently, so
280 it's prone to breakage. (E.g. at one time the name was set to NULL
281 in that situation, which broke a loop over all names in the dynamic
282 library loader.) If you change this function, please try to leave
283 things in a consistent state even if abfd is NULL. */
286 allocate_objfile (bfd *abfd, const char *name, int flags)
288 struct objfile *objfile;
291 objfile = (struct objfile *) xzalloc (sizeof (struct objfile));
292 objfile->psymbol_cache = psymbol_bcache_init ();
293 /* We could use obstack_specify_allocation here instead, but
294 gdb_obstack.h specifies the alloc/dealloc functions. */
295 obstack_init (&objfile->objfile_obstack);
297 objfile_alloc_data (objfile);
301 gdb_assert (abfd == NULL);
302 gdb_assert ((flags & OBJF_NOT_FILENAME) != 0);
303 expanded_name = xstrdup ("<<anonymous objfile>>");
305 else if ((flags & OBJF_NOT_FILENAME) != 0)
306 expanded_name = xstrdup (name);
308 expanded_name = gdb_abspath (name);
309 objfile->original_name = obstack_copy0 (&objfile->objfile_obstack,
311 strlen (expanded_name));
312 xfree (expanded_name);
314 /* Update the per-objfile information that comes from the bfd, ensuring
315 that any data that is reference is saved in the per-objfile data
318 /* Update the per-objfile information that comes from the bfd, ensuring
319 that any data that is reference is saved in the per-objfile data
322 objfile->obfd = abfd;
326 objfile->mtime = bfd_get_mtime (abfd);
328 /* Build section table. */
329 build_objfile_section_table (objfile);
332 objfile->per_bfd = get_objfile_bfd_data (objfile, abfd);
333 objfile->pspace = current_program_space;
335 terminate_minimal_symbol_table (objfile);
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 const 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);
806 for (i = 0; i < objfile->num_sections; ++i)
807 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
810 /* Rebuild section map next time we need it. */
811 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
813 /* Update the table in exec_ops, used to read memory. */
814 ALL_OBJFILE_OSECTIONS (objfile, s)
816 int idx = s - objfile->sections;
818 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
819 obj_section_addr (s));
826 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
827 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
829 The number and ordering of sections does differ between the two objfiles.
830 Only their names match. Also the file offsets will differ (objfile being
831 possibly prelinked but separate_debug_objfile is probably not prelinked) but
832 the in-memory absolute address as specified by NEW_OFFSETS must match both
836 objfile_relocate (struct objfile *objfile,
837 const struct section_offsets *new_offsets)
839 struct objfile *debug_objfile;
842 changed |= objfile_relocate1 (objfile, new_offsets);
844 for (debug_objfile = objfile->separate_debug_objfile;
846 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
848 struct section_addr_info *objfile_addrs;
849 struct section_offsets *new_debug_offsets;
850 struct cleanup *my_cleanups;
852 objfile_addrs = build_section_addr_info_from_objfile (objfile);
853 my_cleanups = make_cleanup (xfree, objfile_addrs);
855 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
856 relative ones must be already created according to debug_objfile. */
858 addr_info_make_relative (objfile_addrs, debug_objfile->obfd);
860 gdb_assert (debug_objfile->num_sections
861 == gdb_bfd_count_sections (debug_objfile->obfd));
863 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections));
864 make_cleanup (xfree, new_debug_offsets);
865 relative_addr_info_to_section_offsets (new_debug_offsets,
866 debug_objfile->num_sections,
869 changed |= objfile_relocate1 (debug_objfile, new_debug_offsets);
871 do_cleanups (my_cleanups);
874 /* Relocate breakpoints as necessary, after things are relocated. */
876 breakpoint_re_set ();
879 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
881 Return non-zero iff any change happened. */
884 objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
886 struct section_offsets *new_offsets =
887 ((struct section_offsets *)
888 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
891 for (i = 0; i < objfile->num_sections; ++i)
892 new_offsets->offsets[i] = slide;
894 return objfile_relocate1 (objfile, new_offsets);
897 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
898 SEPARATE_DEBUG_OBJFILEs. */
901 objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
903 struct objfile *debug_objfile;
906 changed |= objfile_rebase1 (objfile, slide);
908 for (debug_objfile = objfile->separate_debug_objfile;
910 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
911 changed |= objfile_rebase1 (debug_objfile, slide);
913 /* Relocate breakpoints as necessary, after things are relocated. */
915 breakpoint_re_set ();
918 /* Return non-zero if OBJFILE has partial symbols. */
921 objfile_has_partial_symbols (struct objfile *objfile)
926 /* If we have not read psymbols, but we have a function capable of reading
927 them, then that is an indication that they are in fact available. Without
928 this function the symbols may have been already read in but they also may
929 not be present in this objfile. */
930 if ((objfile->flags & OBJF_PSYMTABS_READ) == 0
931 && objfile->sf->sym_read_psymbols != NULL)
934 return objfile->sf->qf->has_symbols (objfile);
937 /* Return non-zero if OBJFILE has full symbols. */
940 objfile_has_full_symbols (struct objfile *objfile)
942 return objfile->symtabs != NULL;
945 /* Return non-zero if OBJFILE has full or partial symbols, either directly
946 or through a separate debug file. */
949 objfile_has_symbols (struct objfile *objfile)
953 for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o))
954 if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o))
960 /* Many places in gdb want to test just to see if we have any partial
961 symbols available. This function returns zero if none are currently
962 available, nonzero otherwise. */
965 have_partial_symbols (void)
971 if (objfile_has_partial_symbols (ofp))
977 /* Many places in gdb want to test just to see if we have any full
978 symbols available. This function returns zero if none are currently
979 available, nonzero otherwise. */
982 have_full_symbols (void)
988 if (objfile_has_full_symbols (ofp))
995 /* This operations deletes all objfile entries that represent solibs that
996 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1000 objfile_purge_solibs (void)
1002 struct objfile *objf;
1003 struct objfile *temp;
1005 ALL_OBJFILES_SAFE (objf, temp)
1007 /* We assume that the solib package has been purged already, or will
1010 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
1011 free_objfile (objf);
1016 /* Many places in gdb want to test just to see if we have any minimal
1017 symbols available. This function returns zero if none are currently
1018 available, nonzero otherwise. */
1021 have_minimal_symbols (void)
1023 struct objfile *ofp;
1027 if (ofp->per_bfd->minimal_symbol_count > 0)
1035 /* Qsort comparison function. */
1038 qsort_cmp (const void *a, const void *b)
1040 const struct obj_section *sect1 = *(const struct obj_section **) a;
1041 const struct obj_section *sect2 = *(const struct obj_section **) b;
1042 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1043 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1045 if (sect1_addr < sect2_addr)
1047 else if (sect1_addr > sect2_addr)
1051 /* Sections are at the same address. This could happen if
1052 A) we have an objfile and a separate debuginfo.
1053 B) we are confused, and have added sections without proper relocation,
1054 or something like that. */
1056 const struct objfile *const objfile1 = sect1->objfile;
1057 const struct objfile *const objfile2 = sect2->objfile;
1059 if (objfile1->separate_debug_objfile == objfile2
1060 || objfile2->separate_debug_objfile == objfile1)
1062 /* Case A. The ordering doesn't matter: separate debuginfo files
1063 will be filtered out later. */
1068 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1069 triage. This section could be slow (since we iterate over all
1070 objfiles in each call to qsort_cmp), but this shouldn't happen
1071 very often (GDB is already in a confused state; one hopes this
1072 doesn't happen at all). If you discover that significant time is
1073 spent in the loops below, do 'set complaints 100' and examine the
1074 resulting complaints. */
1076 if (objfile1 == objfile2)
1078 /* Both sections came from the same objfile. We are really confused.
1079 Sort on sequence order of sections within the objfile. */
1081 const struct obj_section *osect;
1083 ALL_OBJFILE_OSECTIONS (objfile1, osect)
1086 else if (osect == sect2)
1089 /* We should have found one of the sections before getting here. */
1090 gdb_assert_not_reached ("section not found");
1094 /* Sort on sequence number of the objfile in the chain. */
1096 const struct objfile *objfile;
1098 ALL_OBJFILES (objfile)
1099 if (objfile == objfile1)
1101 else if (objfile == objfile2)
1104 /* We should have found one of the objfiles before getting here. */
1105 gdb_assert_not_reached ("objfile not found");
1110 gdb_assert_not_reached ("unexpected code path");
1114 /* Select "better" obj_section to keep. We prefer the one that came from
1115 the real object, rather than the one from separate debuginfo.
1116 Most of the time the two sections are exactly identical, but with
1117 prelinking the .rel.dyn section in the real object may have different
1120 static struct obj_section *
1121 preferred_obj_section (struct obj_section *a, struct obj_section *b)
1123 gdb_assert (obj_section_addr (a) == obj_section_addr (b));
1124 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile)
1125 || (b->objfile->separate_debug_objfile == a->objfile));
1126 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile)
1127 || (b->objfile->separate_debug_objfile_backlink == a->objfile));
1129 if (a->objfile->separate_debug_objfile != NULL)
1134 /* Return 1 if SECTION should be inserted into the section map.
1135 We want to insert only non-overlay and non-TLS section. */
1138 insert_section_p (const struct bfd *abfd,
1139 const struct bfd_section *section)
1141 const bfd_vma lma = bfd_section_lma (abfd, section);
1143 if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section)
1144 && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0)
1145 /* This is an overlay section. IN_MEMORY check is needed to avoid
1146 discarding sections from the "system supplied DSO" (aka vdso)
1147 on some Linux systems (e.g. Fedora 11). */
1149 if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0)
1150 /* This is a TLS section. */
1156 /* Filter out overlapping sections where one section came from the real
1157 objfile, and the other from a separate debuginfo file.
1158 Return the size of table after redundant sections have been eliminated. */
1161 filter_debuginfo_sections (struct obj_section **map, int map_size)
1165 for (i = 0, j = 0; i < map_size - 1; i++)
1167 struct obj_section *const sect1 = map[i];
1168 struct obj_section *const sect2 = map[i + 1];
1169 const struct objfile *const objfile1 = sect1->objfile;
1170 const struct objfile *const objfile2 = sect2->objfile;
1171 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1172 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1174 if (sect1_addr == sect2_addr
1175 && (objfile1->separate_debug_objfile == objfile2
1176 || objfile2->separate_debug_objfile == objfile1))
1178 map[j++] = preferred_obj_section (sect1, sect2);
1187 gdb_assert (i == map_size - 1);
1191 /* The map should not have shrunk to less than half the original size. */
1192 gdb_assert (map_size / 2 <= j);
1197 /* Filter out overlapping sections, issuing a warning if any are found.
1198 Overlapping sections could really be overlay sections which we didn't
1199 classify as such in insert_section_p, or we could be dealing with a
1203 filter_overlapping_sections (struct obj_section **map, int map_size)
1207 for (i = 0, j = 0; i < map_size - 1; )
1212 for (k = i + 1; k < map_size; k++)
1214 struct obj_section *const sect1 = map[i];
1215 struct obj_section *const sect2 = map[k];
1216 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1217 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1218 const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1);
1220 gdb_assert (sect1_addr <= sect2_addr);
1222 if (sect1_endaddr <= sect2_addr)
1226 /* We have an overlap. Report it. */
1228 struct objfile *const objf1 = sect1->objfile;
1229 struct objfile *const objf2 = sect2->objfile;
1231 const struct bfd_section *const bfds1 = sect1->the_bfd_section;
1232 const struct bfd_section *const bfds2 = sect2->the_bfd_section;
1234 const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2);
1236 struct gdbarch *const gdbarch = get_objfile_arch (objf1);
1238 complaint (&symfile_complaints,
1239 _("unexpected overlap between:\n"
1240 " (A) section `%s' from `%s' [%s, %s)\n"
1241 " (B) section `%s' from `%s' [%s, %s).\n"
1242 "Will ignore section B"),
1243 bfd_section_name (abfd1, bfds1), objfile_name (objf1),
1244 paddress (gdbarch, sect1_addr),
1245 paddress (gdbarch, sect1_endaddr),
1246 bfd_section_name (abfd2, bfds2), objfile_name (objf2),
1247 paddress (gdbarch, sect2_addr),
1248 paddress (gdbarch, sect2_endaddr));
1256 gdb_assert (i == map_size - 1);
1264 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1265 TLS, overlay and overlapping sections. */
1268 update_section_map (struct program_space *pspace,
1269 struct obj_section ***pmap, int *pmap_size)
1271 struct objfile_pspace_info *pspace_info;
1272 int alloc_size, map_size, i;
1273 struct obj_section *s, **map;
1274 struct objfile *objfile;
1276 pspace_info = get_objfile_pspace_data (pspace);
1277 gdb_assert (pspace_info->section_map_dirty != 0
1278 || pspace_info->new_objfiles_available != 0);
1284 ALL_PSPACE_OBJFILES (pspace, objfile)
1285 ALL_OBJFILE_OSECTIONS (objfile, s)
1286 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1289 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1290 if (alloc_size == 0)
1297 map = xmalloc (alloc_size * sizeof (*map));
1300 ALL_PSPACE_OBJFILES (pspace, objfile)
1301 ALL_OBJFILE_OSECTIONS (objfile, s)
1302 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1305 qsort (map, alloc_size, sizeof (*map), qsort_cmp);
1306 map_size = filter_debuginfo_sections(map, alloc_size);
1307 map_size = filter_overlapping_sections(map, map_size);
1309 if (map_size < alloc_size)
1310 /* Some sections were eliminated. Trim excess space. */
1311 map = xrealloc (map, map_size * sizeof (*map));
1313 gdb_assert (alloc_size == map_size);
1316 *pmap_size = map_size;
1319 /* Bsearch comparison function. */
1322 bsearch_cmp (const void *key, const void *elt)
1324 const CORE_ADDR pc = *(CORE_ADDR *) key;
1325 const struct obj_section *section = *(const struct obj_section **) elt;
1327 if (pc < obj_section_addr (section))
1329 if (pc < obj_section_endaddr (section))
1334 /* Returns a section whose range includes PC or NULL if none found. */
1336 struct obj_section *
1337 find_pc_section (CORE_ADDR pc)
1339 struct objfile_pspace_info *pspace_info;
1340 struct obj_section *s, **sp;
1342 /* Check for mapped overlay section first. */
1343 s = find_pc_mapped_section (pc);
1347 pspace_info = get_objfile_pspace_data (current_program_space);
1348 if (pspace_info->section_map_dirty
1349 || (pspace_info->new_objfiles_available
1350 && !pspace_info->inhibit_updates))
1352 update_section_map (current_program_space,
1353 &pspace_info->sections,
1354 &pspace_info->num_sections);
1356 /* Don't need updates to section map until objfiles are added,
1357 removed or relocated. */
1358 pspace_info->new_objfiles_available = 0;
1359 pspace_info->section_map_dirty = 0;
1362 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1363 bsearch be non-NULL. */
1364 if (pspace_info->sections == NULL)
1366 gdb_assert (pspace_info->num_sections == 0);
1370 sp = (struct obj_section **) bsearch (&pc,
1371 pspace_info->sections,
1372 pspace_info->num_sections,
1373 sizeof (*pspace_info->sections),
1381 /* Return non-zero if PC is in a section called NAME. */
1384 pc_in_section (CORE_ADDR pc, char *name)
1386 struct obj_section *s;
1389 s = find_pc_section (pc);
1392 && s->the_bfd_section->name != NULL
1393 && strcmp (s->the_bfd_section->name, name) == 0);
1398 /* Set section_map_dirty so section map will be rebuilt next time it
1399 is used. Called by reread_symbols. */
1402 objfiles_changed (void)
1404 /* Rebuild section map next time we need it. */
1405 get_objfile_pspace_data (current_program_space)->section_map_dirty = 1;
1408 /* See comments in objfiles.h. */
1411 inhibit_section_map_updates (struct program_space *pspace)
1413 get_objfile_pspace_data (pspace)->inhibit_updates = 1;
1416 /* See comments in objfiles.h. */
1419 resume_section_map_updates (struct program_space *pspace)
1421 get_objfile_pspace_data (pspace)->inhibit_updates = 0;
1424 /* See comments in objfiles.h. */
1427 resume_section_map_updates_cleanup (void *arg)
1429 resume_section_map_updates (arg);
1432 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1436 is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile)
1438 struct obj_section *osect;
1440 if (objfile == NULL)
1443 ALL_OBJFILE_OSECTIONS (objfile, osect)
1445 if (section_is_overlay (osect) && !section_is_mapped (osect))
1448 if (obj_section_addr (osect) <= addr
1449 && addr < obj_section_endaddr (osect))
1456 shared_objfile_contains_address_p (struct program_space *pspace,
1459 struct objfile *objfile;
1461 ALL_PSPACE_OBJFILES (pspace, objfile)
1463 if ((objfile->flags & OBJF_SHARED) != 0
1464 && is_addr_in_objfile (address, objfile))
1471 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1472 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1473 searching the objfiles in the order they are stored internally,
1474 ignoring CURRENT_OBJFILE.
1476 On most platorms, it should be close enough to doing the best
1477 we can without some knowledge specific to the architecture. */
1480 default_iterate_over_objfiles_in_search_order
1481 (struct gdbarch *gdbarch,
1482 iterate_over_objfiles_in_search_order_cb_ftype *cb,
1483 void *cb_data, struct objfile *current_objfile)
1486 struct objfile *objfile;
1488 ALL_OBJFILES (objfile)
1490 stop = cb (objfile, cb_data);
1496 /* Return canonical name for OBJFILE. */
1499 objfile_name (const struct objfile *objfile)
1501 if (objfile->obfd != NULL)
1502 return bfd_get_filename (objfile->obfd);
1504 return objfile->original_name;
1507 /* Provide a prototype to silence -Wmissing-prototypes. */
1508 extern initialize_file_ftype _initialize_objfiles;
1511 _initialize_objfiles (void)
1513 objfiles_pspace_data
1514 = register_program_space_data_with_cleanup (NULL,
1515 objfiles_pspace_data_cleanup);
1517 objfiles_bfd_data = register_bfd_data_with_cleanup (NULL,
1518 objfile_bfd_data_free);