1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2017 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"
42 #include "breakpoint.h"
44 #include "dictionary.h"
47 #include "arch-utils.h"
50 #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 = (struct objfile_pspace_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 = ((struct objfile_pspace_info *)
103 program_space_data (pspace, objfiles_pspace_data));
106 info = XCNEW (struct objfile_pspace_info);
107 set_program_space_data (pspace, objfiles_pspace_data, info);
115 /* Per-BFD data key. */
117 static const struct bfd_data *objfiles_bfd_data;
119 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
120 NULL, and it already has a per-BFD storage object, use that.
121 Otherwise, allocate a new per-BFD storage object. If ABFD is not
122 NULL, the object is allocated on the BFD; otherwise it is allocated
123 on OBJFILE's obstack. Note that it is not safe to call this
124 multiple times for a given OBJFILE -- it can only be called when
125 allocating or re-initializing OBJFILE. */
127 static struct objfile_per_bfd_storage *
128 get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
130 struct objfile_per_bfd_storage *storage = NULL;
133 storage = ((struct objfile_per_bfd_storage *)
134 bfd_data (abfd, objfiles_bfd_data));
138 /* If the object requires gdb to do relocations, we simply fall
139 back to not sharing data across users. These cases are rare
140 enough that this seems reasonable. */
141 if (abfd != NULL && !gdb_bfd_requires_relocations (abfd))
144 = ((struct objfile_per_bfd_storage *)
145 bfd_alloc (abfd, sizeof (struct objfile_per_bfd_storage)));
146 set_bfd_data (abfd, objfiles_bfd_data, storage);
150 storage = (objfile_per_bfd_storage *)
151 obstack_alloc (&objfile->objfile_obstack,
152 sizeof (objfile_per_bfd_storage));
155 /* objfile_per_bfd_storage is not trivially constructible, must
156 call the ctor manually. */
157 storage = new (storage) objfile_per_bfd_storage ();
159 /* Look up the gdbarch associated with the BFD. */
161 storage->gdbarch = gdbarch_from_bfd (abfd);
163 obstack_init (&storage->storage_obstack);
164 storage->filename_cache = bcache_xmalloc (NULL, NULL);
165 storage->macro_cache = bcache_xmalloc (NULL, NULL);
166 storage->language_of_main = language_unknown;
175 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage *storage)
177 bcache_xfree (storage->filename_cache);
178 bcache_xfree (storage->macro_cache);
179 if (storage->demangled_names_hash)
180 htab_delete (storage->demangled_names_hash);
181 storage->~objfile_per_bfd_storage ();
184 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
185 cleanup function to the BFD registry. */
188 objfile_bfd_data_free (struct bfd *unused, void *d)
190 free_objfile_per_bfd_storage ((struct objfile_per_bfd_storage *) d);
193 /* See objfiles.h. */
196 set_objfile_per_bfd (struct objfile *objfile)
198 objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
201 /* Set the objfile's per-BFD notion of the "main" name and
205 set_objfile_main_name (struct objfile *objfile,
206 const char *name, enum language lang)
208 if (objfile->per_bfd->name_of_main == NULL
209 || strcmp (objfile->per_bfd->name_of_main, name) != 0)
210 objfile->per_bfd->name_of_main
211 = (const char *) obstack_copy0 (&objfile->per_bfd->storage_obstack, name,
213 objfile->per_bfd->language_of_main = lang;
216 /* Helper structure to map blocks to static link properties in hash tables. */
218 struct static_link_htab_entry
220 const struct block *block;
221 const struct dynamic_prop *static_link;
224 /* Return a hash code for struct static_link_htab_entry *P. */
227 static_link_htab_entry_hash (const void *p)
229 const struct static_link_htab_entry *e
230 = (const struct static_link_htab_entry *) p;
232 return htab_hash_pointer (e->block);
235 /* Return whether P1 an P2 (pointers to struct static_link_htab_entry) are
236 mappings for the same block. */
239 static_link_htab_entry_eq (const void *p1, const void *p2)
241 const struct static_link_htab_entry *e1
242 = (const struct static_link_htab_entry *) p1;
243 const struct static_link_htab_entry *e2
244 = (const struct static_link_htab_entry *) p2;
246 return e1->block == e2->block;
249 /* Register STATIC_LINK as the static link for BLOCK, which is part of OBJFILE.
250 Must not be called more than once for each BLOCK. */
253 objfile_register_static_link (struct objfile *objfile,
254 const struct block *block,
255 const struct dynamic_prop *static_link)
258 struct static_link_htab_entry lookup_entry;
259 struct static_link_htab_entry *entry;
261 if (objfile->static_links == NULL)
262 objfile->static_links = htab_create_alloc
263 (1, &static_link_htab_entry_hash, static_link_htab_entry_eq, NULL,
266 /* Create a slot for the mapping, make sure it's the first mapping for this
267 block and then create the mapping itself. */
268 lookup_entry.block = block;
269 slot = htab_find_slot (objfile->static_links, &lookup_entry, INSERT);
270 gdb_assert (*slot == NULL);
272 entry = (struct static_link_htab_entry *) obstack_alloc
273 (&objfile->objfile_obstack, sizeof (*entry));
274 entry->block = block;
275 entry->static_link = static_link;
276 *slot = (void *) entry;
279 /* Look for a static link for BLOCK, which is part of OBJFILE. Return NULL if
282 const struct dynamic_prop *
283 objfile_lookup_static_link (struct objfile *objfile,
284 const struct block *block)
286 struct static_link_htab_entry *entry;
287 struct static_link_htab_entry lookup_entry;
289 if (objfile->static_links == NULL)
291 lookup_entry.block = block;
293 = (struct static_link_htab_entry *) htab_find (objfile->static_links,
298 gdb_assert (entry->block == block);
299 return entry->static_link;
304 /* Called via bfd_map_over_sections to build up the section table that
305 the objfile references. The objfile contains pointers to the start
306 of the table (objfile->sections) and to the first location after
307 the end of the table (objfile->sections_end). */
310 add_to_objfile_sections_full (struct bfd *abfd, struct bfd_section *asect,
311 struct objfile *objfile, int force)
313 struct obj_section *section;
319 aflag = bfd_get_section_flags (abfd, asect);
320 if (!(aflag & SEC_ALLOC))
324 section = &objfile->sections[gdb_bfd_section_index (abfd, asect)];
325 section->objfile = objfile;
326 section->the_bfd_section = asect;
327 section->ovly_mapped = 0;
331 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
334 add_to_objfile_sections_full (abfd, asect, (struct objfile *) objfilep, 0);
337 /* Builds a section table for OBJFILE.
339 Note that the OFFSET and OVLY_MAPPED in each table entry are
340 initialized to zero. */
343 build_objfile_section_table (struct objfile *objfile)
345 int count = gdb_bfd_count_sections (objfile->obfd);
347 objfile->sections = OBSTACK_CALLOC (&objfile->objfile_obstack,
350 objfile->sections_end = (objfile->sections + count);
351 bfd_map_over_sections (objfile->obfd,
352 add_to_objfile_sections, (void *) objfile);
354 /* See gdb_bfd_section_index. */
355 add_to_objfile_sections_full (objfile->obfd, bfd_com_section_ptr, objfile, 1);
356 add_to_objfile_sections_full (objfile->obfd, bfd_und_section_ptr, objfile, 1);
357 add_to_objfile_sections_full (objfile->obfd, bfd_abs_section_ptr, objfile, 1);
358 add_to_objfile_sections_full (objfile->obfd, bfd_ind_section_ptr, objfile, 1);
361 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
362 allocate a new objfile struct, fill it in as best we can, link it
363 into the list of all known objfiles, and return a pointer to the
366 NAME should contain original non-canonicalized filename or other
367 identifier as entered by user. If there is no better source use
368 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
369 NAME content is copied into returned objfile.
371 The FLAGS word contains various bits (OBJF_*) that can be taken as
372 requests for specific operations. Other bits like OBJF_SHARED are
373 simply copied through to the new objfile flags member. */
376 allocate_objfile (bfd *abfd, const char *name, objfile_flags flags)
378 struct objfile *objfile;
381 objfile = XCNEW (struct objfile);
382 objfile->psymbol_cache = psymbol_bcache_init ();
383 /* We could use obstack_specify_allocation here instead, but
384 gdb_obstack.h specifies the alloc/dealloc functions. */
385 obstack_init (&objfile->objfile_obstack);
387 objfile_alloc_data (objfile);
391 gdb_assert (abfd == NULL);
392 gdb_assert ((flags & OBJF_NOT_FILENAME) != 0);
393 expanded_name = xstrdup ("<<anonymous objfile>>");
395 else if ((flags & OBJF_NOT_FILENAME) != 0
396 || is_target_filename (name))
397 expanded_name = xstrdup (name);
399 expanded_name = gdb_abspath (name);
400 objfile->original_name
401 = (char *) obstack_copy0 (&objfile->objfile_obstack,
403 strlen (expanded_name));
404 xfree (expanded_name);
406 /* Update the per-objfile information that comes from the bfd, ensuring
407 that any data that is reference is saved in the per-objfile data
410 objfile->obfd = abfd;
414 objfile->mtime = bfd_get_mtime (abfd);
416 /* Build section table. */
417 build_objfile_section_table (objfile);
420 objfile->per_bfd = get_objfile_bfd_data (objfile, abfd);
421 objfile->pspace = current_program_space;
423 terminate_minimal_symbol_table (objfile);
425 /* Initialize the section indexes for this objfile, so that we can
426 later detect if they are used w/o being properly assigned to. */
428 objfile->sect_index_text = -1;
429 objfile->sect_index_data = -1;
430 objfile->sect_index_bss = -1;
431 objfile->sect_index_rodata = -1;
433 /* Add this file onto the tail of the linked list of other such files. */
435 objfile->next = NULL;
436 if (object_files == NULL)
437 object_files = objfile;
440 struct objfile *last_one;
442 for (last_one = object_files;
444 last_one = last_one->next);
445 last_one->next = objfile;
448 /* Save passed in flag bits. */
449 objfile->flags |= flags;
451 /* Rebuild section map next time we need it. */
452 get_objfile_pspace_data (objfile->pspace)->new_objfiles_available = 1;
457 /* Retrieve the gdbarch associated with OBJFILE. */
460 get_objfile_arch (const struct objfile *objfile)
462 return objfile->per_bfd->gdbarch;
465 /* If there is a valid and known entry point, function fills *ENTRY_P with it
466 and returns non-zero; otherwise it returns zero. */
469 entry_point_address_query (CORE_ADDR *entry_p)
471 if (symfile_objfile == NULL || !symfile_objfile->per_bfd->ei.entry_point_p)
474 *entry_p = (symfile_objfile->per_bfd->ei.entry_point
475 + ANOFFSET (symfile_objfile->section_offsets,
476 symfile_objfile->per_bfd->ei.the_bfd_section_index));
481 /* Get current entry point address. Call error if it is not known. */
484 entry_point_address (void)
488 if (!entry_point_address_query (&retval))
489 error (_("Entry point address is not known."));
494 /* Iterator on PARENT and every separate debug objfile of PARENT.
495 The usage pattern is:
496 for (objfile = parent;
498 objfile = objfile_separate_debug_iterate (parent, objfile))
503 objfile_separate_debug_iterate (const struct objfile *parent,
504 const struct objfile *objfile)
508 /* If any, return the first child. */
509 res = objfile->separate_debug_objfile;
513 /* Common case where there is no separate debug objfile. */
514 if (objfile == parent)
517 /* Return the brother if any. Note that we don't iterate on brothers of
519 res = objfile->separate_debug_objfile_link;
523 for (res = objfile->separate_debug_objfile_backlink;
525 res = res->separate_debug_objfile_backlink)
527 gdb_assert (res != NULL);
528 if (res->separate_debug_objfile_link)
529 return res->separate_debug_objfile_link;
534 /* Put one object file before a specified on in the global list.
535 This can be used to make sure an object file is destroyed before
536 another when using ALL_OBJFILES_SAFE to free all objfiles. */
538 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
540 struct objfile **objp;
542 unlink_objfile (objfile);
544 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
546 if (*objp == before_this)
548 objfile->next = *objp;
554 internal_error (__FILE__, __LINE__,
555 _("put_objfile_before: before objfile not in list"));
558 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
561 It is not a bug, or error, to call this function if OBJFILE is not known
562 to be in the current list. This is done in the case of mapped objfiles,
563 for example, just to ensure that the mapped objfile doesn't appear twice
564 in the list. Since the list is threaded, linking in a mapped objfile
565 twice would create a circular list.
567 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
568 unlinking it, just to ensure that we have completely severed any linkages
569 between the OBJFILE and the list. */
572 unlink_objfile (struct objfile *objfile)
574 struct objfile **objpp;
576 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
578 if (*objpp == objfile)
580 *objpp = (*objpp)->next;
581 objfile->next = NULL;
586 internal_error (__FILE__, __LINE__,
587 _("unlink_objfile: objfile already unlinked"));
590 /* Add OBJFILE as a separate debug objfile of PARENT. */
593 add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent)
595 gdb_assert (objfile && parent);
597 /* Must not be already in a list. */
598 gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
599 gdb_assert (objfile->separate_debug_objfile_link == NULL);
600 gdb_assert (objfile->separate_debug_objfile == NULL);
601 gdb_assert (parent->separate_debug_objfile_backlink == NULL);
602 gdb_assert (parent->separate_debug_objfile_link == NULL);
604 objfile->separate_debug_objfile_backlink = parent;
605 objfile->separate_debug_objfile_link = parent->separate_debug_objfile;
606 parent->separate_debug_objfile = objfile;
608 /* Put the separate debug object before the normal one, this is so that
609 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
610 put_objfile_before (objfile, parent);
613 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
617 free_objfile_separate_debug (struct objfile *objfile)
619 struct objfile *child;
621 for (child = objfile->separate_debug_objfile; child;)
623 struct objfile *next_child = child->separate_debug_objfile_link;
624 free_objfile (child);
629 /* Destroy an objfile and all the symtabs and psymtabs under it. */
632 free_objfile (struct objfile *objfile)
634 /* First notify observers that this objfile is about to be freed. */
635 observer_notify_free_objfile (objfile);
637 /* Free all separate debug objfiles. */
638 free_objfile_separate_debug (objfile);
640 if (objfile->separate_debug_objfile_backlink)
642 /* We freed the separate debug file, make sure the base objfile
643 doesn't reference it. */
644 struct objfile *child;
646 child = objfile->separate_debug_objfile_backlink->separate_debug_objfile;
648 if (child == objfile)
650 /* OBJFILE is the first child. */
651 objfile->separate_debug_objfile_backlink->separate_debug_objfile =
652 objfile->separate_debug_objfile_link;
656 /* Find OBJFILE in the list. */
659 if (child->separate_debug_objfile_link == objfile)
661 child->separate_debug_objfile_link =
662 objfile->separate_debug_objfile_link;
665 child = child->separate_debug_objfile_link;
671 /* Remove any references to this objfile in the global value
673 preserve_values (objfile);
675 /* It still may reference data modules have associated with the objfile and
676 the symbol file data. */
677 forget_cached_source_info_for_objfile (objfile);
679 breakpoint_free_objfile (objfile);
680 btrace_free_objfile (objfile);
682 /* First do any symbol file specific actions required when we are
683 finished with a particular symbol file. Note that if the objfile
684 is using reusable symbol information (via mmalloc) then each of
685 these routines is responsible for doing the correct thing, either
686 freeing things which are valid only during this particular gdb
687 execution, or leaving them to be reused during the next one. */
689 if (objfile->sf != NULL)
691 (*objfile->sf->sym_finish) (objfile);
694 /* Discard any data modules have associated with the objfile. The function
695 still may reference objfile->obfd. */
696 objfile_free_data (objfile);
699 gdb_bfd_unref (objfile->obfd);
701 free_objfile_per_bfd_storage (objfile->per_bfd);
703 /* Remove it from the chain of all objfiles. */
705 unlink_objfile (objfile);
707 if (objfile == symfile_objfile)
708 symfile_objfile = NULL;
710 /* Before the symbol table code was redone to make it easier to
711 selectively load and remove information particular to a specific
712 linkage unit, gdb used to do these things whenever the monolithic
713 symbol table was blown away. How much still needs to be done
714 is unknown, but we play it safe for now and keep each action until
715 it is shown to be no longer needed. */
717 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
718 for example), so we need to call this here. */
719 clear_pc_function_cache ();
721 /* Clear globals which might have pointed into a removed objfile.
722 FIXME: It's not clear which of these are supposed to persist
723 between expressions and which ought to be reset each time. */
724 expression_context_block = NULL;
725 innermost_block = NULL;
727 /* Check to see if the current_source_symtab belongs to this objfile,
728 and if so, call clear_current_source_symtab_and_line. */
731 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
733 if (cursal.symtab && SYMTAB_OBJFILE (cursal.symtab) == objfile)
734 clear_current_source_symtab_and_line ();
737 if (objfile->global_psymbols.list)
738 xfree (objfile->global_psymbols.list);
739 if (objfile->static_psymbols.list)
740 xfree (objfile->static_psymbols.list);
741 /* Free the obstacks for non-reusable objfiles. */
742 psymbol_bcache_free (objfile->psymbol_cache);
743 obstack_free (&objfile->objfile_obstack, 0);
745 /* Rebuild section map next time we need it. */
746 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
748 /* Free the map for static links. There's no need to free static link
749 themselves since they were allocated on the objstack. */
750 if (objfile->static_links != NULL)
751 htab_delete (objfile->static_links);
753 /* The last thing we do is free the objfile struct itself. */
758 do_free_objfile_cleanup (void *obj)
760 free_objfile ((struct objfile *) obj);
764 make_cleanup_free_objfile (struct objfile *obj)
766 return make_cleanup (do_free_objfile_cleanup, obj);
769 /* Free all the object files at once and clean up their users. */
772 free_all_objfiles (void)
774 struct objfile *objfile, *temp;
777 /* Any objfile referencewould become stale. */
778 for (so = master_so_list (); so; so = so->next)
779 gdb_assert (so->objfile == NULL);
781 ALL_OBJFILES_SAFE (objfile, temp)
783 free_objfile (objfile);
785 clear_symtab_users (0);
788 /* A helper function for objfile_relocate1 that relocates a single
792 relocate_one_symbol (struct symbol *sym, struct objfile *objfile,
793 struct section_offsets *delta)
795 fixup_symbol_section (sym, objfile);
797 /* The RS6000 code from which this was taken skipped
798 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
799 But I'm leaving out that test, on the theory that
800 they can't possibly pass the tests below. */
801 if ((SYMBOL_CLASS (sym) == LOC_LABEL
802 || SYMBOL_CLASS (sym) == LOC_STATIC)
803 && SYMBOL_SECTION (sym) >= 0)
805 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
809 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
810 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
811 Return non-zero iff any change happened. */
814 objfile_relocate1 (struct objfile *objfile,
815 const struct section_offsets *new_offsets)
817 struct obj_section *s;
818 struct section_offsets *delta =
819 ((struct section_offsets *)
820 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
823 int something_changed = 0;
825 for (i = 0; i < objfile->num_sections; ++i)
828 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
829 if (ANOFFSET (delta, i) != 0)
830 something_changed = 1;
832 if (!something_changed)
835 /* OK, get all the symtabs. */
837 struct compunit_symtab *cust;
840 ALL_OBJFILE_FILETABS (objfile, cust, s)
845 /* First the line table. */
846 l = SYMTAB_LINETABLE (s);
849 for (i = 0; i < l->nitems; ++i)
850 l->item[i].pc += ANOFFSET (delta,
851 COMPUNIT_BLOCK_LINE_SECTION
856 ALL_OBJFILE_COMPUNITS (objfile, cust)
858 const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (cust);
859 int block_line_section = COMPUNIT_BLOCK_LINE_SECTION (cust);
861 if (BLOCKVECTOR_MAP (bv))
862 addrmap_relocate (BLOCKVECTOR_MAP (bv),
863 ANOFFSET (delta, block_line_section));
865 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
869 struct dict_iterator iter;
871 b = BLOCKVECTOR_BLOCK (bv, i);
872 BLOCK_START (b) += ANOFFSET (delta, block_line_section);
873 BLOCK_END (b) += ANOFFSET (delta, block_line_section);
875 /* We only want to iterate over the local symbols, not any
876 symbols in included symtabs. */
877 ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym)
879 relocate_one_symbol (sym, objfile, delta);
885 /* Relocate isolated symbols. */
889 for (iter = objfile->template_symbols; iter; iter = iter->hash_next)
890 relocate_one_symbol (iter, objfile, delta);
893 if (objfile->psymtabs_addrmap)
894 addrmap_relocate (objfile->psymtabs_addrmap,
895 ANOFFSET (delta, SECT_OFF_TEXT (objfile)));
898 objfile->sf->qf->relocate (objfile, new_offsets, delta);
903 for (i = 0; i < objfile->num_sections; ++i)
904 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
907 /* Rebuild section map next time we need it. */
908 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
910 /* Update the table in exec_ops, used to read memory. */
911 ALL_OBJFILE_OSECTIONS (objfile, s)
913 int idx = s - objfile->sections;
915 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
916 obj_section_addr (s));
923 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
924 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
926 The number and ordering of sections does differ between the two objfiles.
927 Only their names match. Also the file offsets will differ (objfile being
928 possibly prelinked but separate_debug_objfile is probably not prelinked) but
929 the in-memory absolute address as specified by NEW_OFFSETS must match both
933 objfile_relocate (struct objfile *objfile,
934 const struct section_offsets *new_offsets)
936 struct objfile *debug_objfile;
939 changed |= objfile_relocate1 (objfile, new_offsets);
941 for (debug_objfile = objfile->separate_debug_objfile;
943 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
945 struct section_addr_info *objfile_addrs;
946 struct cleanup *my_cleanups;
948 objfile_addrs = build_section_addr_info_from_objfile (objfile);
949 my_cleanups = make_cleanup (xfree, objfile_addrs);
951 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
952 relative ones must be already created according to debug_objfile. */
954 addr_info_make_relative (objfile_addrs, debug_objfile->obfd);
956 gdb_assert (debug_objfile->num_sections
957 == gdb_bfd_count_sections (debug_objfile->obfd));
958 std::vector<struct section_offsets>
959 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections));
960 relative_addr_info_to_section_offsets (new_debug_offsets.data (),
961 debug_objfile->num_sections,
964 changed |= objfile_relocate1 (debug_objfile, new_debug_offsets.data ());
966 do_cleanups (my_cleanups);
969 /* Relocate breakpoints as necessary, after things are relocated. */
971 breakpoint_re_set ();
974 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
976 Return non-zero iff any change happened. */
979 objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
981 struct section_offsets *new_offsets =
982 ((struct section_offsets *)
983 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
986 for (i = 0; i < objfile->num_sections; ++i)
987 new_offsets->offsets[i] = slide;
989 return objfile_relocate1 (objfile, new_offsets);
992 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
993 SEPARATE_DEBUG_OBJFILEs. */
996 objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
998 struct objfile *debug_objfile;
1001 changed |= objfile_rebase1 (objfile, slide);
1003 for (debug_objfile = objfile->separate_debug_objfile;
1005 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
1006 changed |= objfile_rebase1 (debug_objfile, slide);
1008 /* Relocate breakpoints as necessary, after things are relocated. */
1010 breakpoint_re_set ();
1013 /* Return non-zero if OBJFILE has partial symbols. */
1016 objfile_has_partial_symbols (struct objfile *objfile)
1021 /* If we have not read psymbols, but we have a function capable of reading
1022 them, then that is an indication that they are in fact available. Without
1023 this function the symbols may have been already read in but they also may
1024 not be present in this objfile. */
1025 if ((objfile->flags & OBJF_PSYMTABS_READ) == 0
1026 && objfile->sf->sym_read_psymbols != NULL)
1029 return objfile->sf->qf->has_symbols (objfile);
1032 /* Return non-zero if OBJFILE has full symbols. */
1035 objfile_has_full_symbols (struct objfile *objfile)
1037 return objfile->compunit_symtabs != NULL;
1040 /* Return non-zero if OBJFILE has full or partial symbols, either directly
1041 or through a separate debug file. */
1044 objfile_has_symbols (struct objfile *objfile)
1048 for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o))
1049 if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o))
1055 /* Many places in gdb want to test just to see if we have any partial
1056 symbols available. This function returns zero if none are currently
1057 available, nonzero otherwise. */
1060 have_partial_symbols (void)
1062 struct objfile *ofp;
1066 if (objfile_has_partial_symbols (ofp))
1072 /* Many places in gdb want to test just to see if we have any full
1073 symbols available. This function returns zero if none are currently
1074 available, nonzero otherwise. */
1077 have_full_symbols (void)
1079 struct objfile *ofp;
1083 if (objfile_has_full_symbols (ofp))
1090 /* This operations deletes all objfile entries that represent solibs that
1091 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1095 objfile_purge_solibs (void)
1097 struct objfile *objf;
1098 struct objfile *temp;
1100 ALL_OBJFILES_SAFE (objf, temp)
1102 /* We assume that the solib package has been purged already, or will
1105 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
1106 free_objfile (objf);
1111 /* Many places in gdb want to test just to see if we have any minimal
1112 symbols available. This function returns zero if none are currently
1113 available, nonzero otherwise. */
1116 have_minimal_symbols (void)
1118 struct objfile *ofp;
1122 if (ofp->per_bfd->minimal_symbol_count > 0)
1130 /* Qsort comparison function. */
1133 qsort_cmp (const void *a, const void *b)
1135 const struct obj_section *sect1 = *(const struct obj_section **) a;
1136 const struct obj_section *sect2 = *(const struct obj_section **) b;
1137 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1138 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1140 if (sect1_addr < sect2_addr)
1142 else if (sect1_addr > sect2_addr)
1146 /* Sections are at the same address. This could happen if
1147 A) we have an objfile and a separate debuginfo.
1148 B) we are confused, and have added sections without proper relocation,
1149 or something like that. */
1151 const struct objfile *const objfile1 = sect1->objfile;
1152 const struct objfile *const objfile2 = sect2->objfile;
1154 if (objfile1->separate_debug_objfile == objfile2
1155 || objfile2->separate_debug_objfile == objfile1)
1157 /* Case A. The ordering doesn't matter: separate debuginfo files
1158 will be filtered out later. */
1163 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1164 triage. This section could be slow (since we iterate over all
1165 objfiles in each call to qsort_cmp), but this shouldn't happen
1166 very often (GDB is already in a confused state; one hopes this
1167 doesn't happen at all). If you discover that significant time is
1168 spent in the loops below, do 'set complaints 100' and examine the
1169 resulting complaints. */
1171 if (objfile1 == objfile2)
1173 /* Both sections came from the same objfile. We are really confused.
1174 Sort on sequence order of sections within the objfile. */
1176 const struct obj_section *osect;
1178 ALL_OBJFILE_OSECTIONS (objfile1, osect)
1181 else if (osect == sect2)
1184 /* We should have found one of the sections before getting here. */
1185 gdb_assert_not_reached ("section not found");
1189 /* Sort on sequence number of the objfile in the chain. */
1191 const struct objfile *objfile;
1193 ALL_OBJFILES (objfile)
1194 if (objfile == objfile1)
1196 else if (objfile == objfile2)
1199 /* We should have found one of the objfiles before getting here. */
1200 gdb_assert_not_reached ("objfile not found");
1205 gdb_assert_not_reached ("unexpected code path");
1209 /* Select "better" obj_section to keep. We prefer the one that came from
1210 the real object, rather than the one from separate debuginfo.
1211 Most of the time the two sections are exactly identical, but with
1212 prelinking the .rel.dyn section in the real object may have different
1215 static struct obj_section *
1216 preferred_obj_section (struct obj_section *a, struct obj_section *b)
1218 gdb_assert (obj_section_addr (a) == obj_section_addr (b));
1219 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile)
1220 || (b->objfile->separate_debug_objfile == a->objfile));
1221 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile)
1222 || (b->objfile->separate_debug_objfile_backlink == a->objfile));
1224 if (a->objfile->separate_debug_objfile != NULL)
1229 /* Return 1 if SECTION should be inserted into the section map.
1230 We want to insert only non-overlay and non-TLS section. */
1233 insert_section_p (const struct bfd *abfd,
1234 const struct bfd_section *section)
1236 const bfd_vma lma = bfd_section_lma (abfd, section);
1238 if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section)
1239 && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0)
1240 /* This is an overlay section. IN_MEMORY check is needed to avoid
1241 discarding sections from the "system supplied DSO" (aka vdso)
1242 on some Linux systems (e.g. Fedora 11). */
1244 if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0)
1245 /* This is a TLS section. */
1251 /* Filter out overlapping sections where one section came from the real
1252 objfile, and the other from a separate debuginfo file.
1253 Return the size of table after redundant sections have been eliminated. */
1256 filter_debuginfo_sections (struct obj_section **map, int map_size)
1260 for (i = 0, j = 0; i < map_size - 1; i++)
1262 struct obj_section *const sect1 = map[i];
1263 struct obj_section *const sect2 = map[i + 1];
1264 const struct objfile *const objfile1 = sect1->objfile;
1265 const struct objfile *const objfile2 = sect2->objfile;
1266 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1267 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1269 if (sect1_addr == sect2_addr
1270 && (objfile1->separate_debug_objfile == objfile2
1271 || objfile2->separate_debug_objfile == objfile1))
1273 map[j++] = preferred_obj_section (sect1, sect2);
1282 gdb_assert (i == map_size - 1);
1286 /* The map should not have shrunk to less than half the original size. */
1287 gdb_assert (map_size / 2 <= j);
1292 /* Filter out overlapping sections, issuing a warning if any are found.
1293 Overlapping sections could really be overlay sections which we didn't
1294 classify as such in insert_section_p, or we could be dealing with a
1298 filter_overlapping_sections (struct obj_section **map, int map_size)
1302 for (i = 0, j = 0; i < map_size - 1; )
1307 for (k = i + 1; k < map_size; k++)
1309 struct obj_section *const sect1 = map[i];
1310 struct obj_section *const sect2 = map[k];
1311 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1312 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1313 const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1);
1315 gdb_assert (sect1_addr <= sect2_addr);
1317 if (sect1_endaddr <= sect2_addr)
1321 /* We have an overlap. Report it. */
1323 struct objfile *const objf1 = sect1->objfile;
1324 struct objfile *const objf2 = sect2->objfile;
1326 const struct bfd_section *const bfds1 = sect1->the_bfd_section;
1327 const struct bfd_section *const bfds2 = sect2->the_bfd_section;
1329 const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2);
1331 struct gdbarch *const gdbarch = get_objfile_arch (objf1);
1333 complaint (&symfile_complaints,
1334 _("unexpected overlap between:\n"
1335 " (A) section `%s' from `%s' [%s, %s)\n"
1336 " (B) section `%s' from `%s' [%s, %s).\n"
1337 "Will ignore section B"),
1338 bfd_section_name (abfd1, bfds1), objfile_name (objf1),
1339 paddress (gdbarch, sect1_addr),
1340 paddress (gdbarch, sect1_endaddr),
1341 bfd_section_name (abfd2, bfds2), objfile_name (objf2),
1342 paddress (gdbarch, sect2_addr),
1343 paddress (gdbarch, sect2_endaddr));
1351 gdb_assert (i == map_size - 1);
1359 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1360 TLS, overlay and overlapping sections. */
1363 update_section_map (struct program_space *pspace,
1364 struct obj_section ***pmap, int *pmap_size)
1366 struct objfile_pspace_info *pspace_info;
1367 int alloc_size, map_size, i;
1368 struct obj_section *s, **map;
1369 struct objfile *objfile;
1371 pspace_info = get_objfile_pspace_data (pspace);
1372 gdb_assert (pspace_info->section_map_dirty != 0
1373 || pspace_info->new_objfiles_available != 0);
1379 ALL_PSPACE_OBJFILES (pspace, objfile)
1380 ALL_OBJFILE_OSECTIONS (objfile, s)
1381 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1384 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1385 if (alloc_size == 0)
1392 map = XNEWVEC (struct obj_section *, alloc_size);
1395 ALL_PSPACE_OBJFILES (pspace, objfile)
1396 ALL_OBJFILE_OSECTIONS (objfile, s)
1397 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1400 qsort (map, alloc_size, sizeof (*map), qsort_cmp);
1401 map_size = filter_debuginfo_sections(map, alloc_size);
1402 map_size = filter_overlapping_sections(map, map_size);
1404 if (map_size < alloc_size)
1405 /* Some sections were eliminated. Trim excess space. */
1406 map = XRESIZEVEC (struct obj_section *, map, map_size);
1408 gdb_assert (alloc_size == map_size);
1411 *pmap_size = map_size;
1414 /* Bsearch comparison function. */
1417 bsearch_cmp (const void *key, const void *elt)
1419 const CORE_ADDR pc = *(CORE_ADDR *) key;
1420 const struct obj_section *section = *(const struct obj_section **) elt;
1422 if (pc < obj_section_addr (section))
1424 if (pc < obj_section_endaddr (section))
1429 /* Returns a section whose range includes PC or NULL if none found. */
1431 struct obj_section *
1432 find_pc_section (CORE_ADDR pc)
1434 struct objfile_pspace_info *pspace_info;
1435 struct obj_section *s, **sp;
1437 /* Check for mapped overlay section first. */
1438 s = find_pc_mapped_section (pc);
1442 pspace_info = get_objfile_pspace_data (current_program_space);
1443 if (pspace_info->section_map_dirty
1444 || (pspace_info->new_objfiles_available
1445 && !pspace_info->inhibit_updates))
1447 update_section_map (current_program_space,
1448 &pspace_info->sections,
1449 &pspace_info->num_sections);
1451 /* Don't need updates to section map until objfiles are added,
1452 removed or relocated. */
1453 pspace_info->new_objfiles_available = 0;
1454 pspace_info->section_map_dirty = 0;
1457 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1458 bsearch be non-NULL. */
1459 if (pspace_info->sections == NULL)
1461 gdb_assert (pspace_info->num_sections == 0);
1465 sp = (struct obj_section **) bsearch (&pc,
1466 pspace_info->sections,
1467 pspace_info->num_sections,
1468 sizeof (*pspace_info->sections),
1476 /* Return non-zero if PC is in a section called NAME. */
1479 pc_in_section (CORE_ADDR pc, const char *name)
1481 struct obj_section *s;
1484 s = find_pc_section (pc);
1487 && s->the_bfd_section->name != NULL
1488 && strcmp (s->the_bfd_section->name, name) == 0);
1493 /* Set section_map_dirty so section map will be rebuilt next time it
1494 is used. Called by reread_symbols. */
1497 objfiles_changed (void)
1499 /* Rebuild section map next time we need it. */
1500 get_objfile_pspace_data (current_program_space)->section_map_dirty = 1;
1503 /* See comments in objfiles.h. */
1506 inhibit_section_map_updates (struct program_space *pspace)
1508 get_objfile_pspace_data (pspace)->inhibit_updates = 1;
1511 /* See comments in objfiles.h. */
1514 resume_section_map_updates (struct program_space *pspace)
1516 get_objfile_pspace_data (pspace)->inhibit_updates = 0;
1519 /* See comments in objfiles.h. */
1522 resume_section_map_updates_cleanup (void *arg)
1524 resume_section_map_updates ((struct program_space *) arg);
1527 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1531 is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile)
1533 struct obj_section *osect;
1535 if (objfile == NULL)
1538 ALL_OBJFILE_OSECTIONS (objfile, osect)
1540 if (section_is_overlay (osect) && !section_is_mapped (osect))
1543 if (obj_section_addr (osect) <= addr
1544 && addr < obj_section_endaddr (osect))
1551 shared_objfile_contains_address_p (struct program_space *pspace,
1554 struct objfile *objfile;
1556 ALL_PSPACE_OBJFILES (pspace, objfile)
1558 if ((objfile->flags & OBJF_SHARED) != 0
1559 && is_addr_in_objfile (address, objfile))
1566 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1567 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1568 searching the objfiles in the order they are stored internally,
1569 ignoring CURRENT_OBJFILE.
1571 On most platorms, it should be close enough to doing the best
1572 we can without some knowledge specific to the architecture. */
1575 default_iterate_over_objfiles_in_search_order
1576 (struct gdbarch *gdbarch,
1577 iterate_over_objfiles_in_search_order_cb_ftype *cb,
1578 void *cb_data, struct objfile *current_objfile)
1581 struct objfile *objfile;
1583 ALL_OBJFILES (objfile)
1585 stop = cb (objfile, cb_data);
1591 /* See objfiles.h. */
1594 objfile_name (const struct objfile *objfile)
1596 if (objfile->obfd != NULL)
1597 return bfd_get_filename (objfile->obfd);
1599 return objfile->original_name;
1602 /* See objfiles.h. */
1605 objfile_filename (const struct objfile *objfile)
1607 if (objfile->obfd != NULL)
1608 return bfd_get_filename (objfile->obfd);
1613 /* See objfiles.h. */
1616 objfile_debug_name (const struct objfile *objfile)
1618 return lbasename (objfile->original_name);
1621 /* See objfiles.h. */
1624 objfile_flavour_name (struct objfile *objfile)
1626 if (objfile->obfd != NULL)
1627 return bfd_flavour_name (bfd_get_flavour (objfile->obfd));
1631 /* Provide a prototype to silence -Wmissing-prototypes. */
1632 extern initialize_file_ftype _initialize_objfiles;
1635 _initialize_objfiles (void)
1637 objfiles_pspace_data
1638 = register_program_space_data_with_cleanup (NULL,
1639 objfiles_pspace_data_cleanup);
1641 objfiles_bfd_data = register_bfd_data_with_cleanup (NULL,
1642 objfile_bfd_data_free);