1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2013 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 = XZALLOC (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);
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);
191 /* Called via bfd_map_over_sections to build up the section table that
192 the objfile references. The objfile contains pointers to the start
193 of the table (objfile->sections) and to the first location after
194 the end of the table (objfile->sections_end). */
197 add_to_objfile_sections_full (struct bfd *abfd, struct bfd_section *asect,
198 struct objfile *objfile, int force)
200 struct obj_section *section;
206 aflag = bfd_get_section_flags (abfd, asect);
207 if (!(aflag & SEC_ALLOC))
211 section = &objfile->sections[gdb_bfd_section_index (abfd, asect)];
212 section->objfile = objfile;
213 section->the_bfd_section = asect;
214 section->ovly_mapped = 0;
218 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
221 add_to_objfile_sections_full (abfd, asect, objfilep, 0);
224 /* Builds a section table for OBJFILE.
226 Note that the OFFSET and OVLY_MAPPED in each table entry are
227 initialized to zero. */
230 build_objfile_section_table (struct objfile *objfile)
232 int count = gdb_bfd_count_sections (objfile->obfd);
234 objfile->sections = OBSTACK_CALLOC (&objfile->objfile_obstack,
237 objfile->sections_end = (objfile->sections + count);
238 bfd_map_over_sections (objfile->obfd,
239 add_to_objfile_sections, (void *) objfile);
241 /* See gdb_bfd_section_index. */
242 add_to_objfile_sections_full (objfile->obfd, bfd_com_section_ptr, objfile, 1);
243 add_to_objfile_sections_full (objfile->obfd, bfd_und_section_ptr, objfile, 1);
244 add_to_objfile_sections_full (objfile->obfd, bfd_abs_section_ptr, objfile, 1);
245 add_to_objfile_sections_full (objfile->obfd, bfd_ind_section_ptr, objfile, 1);
248 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
249 allocate a new objfile struct, fill it in as best we can, link it
250 into the list of all known objfiles, and return a pointer to the
253 NAME should contain original non-canonicalized filename or other
254 identifier as entered by user. If there is no better source use
255 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
256 NAME content is copied into returned objfile.
258 The FLAGS word contains various bits (OBJF_*) that can be taken as
259 requests for specific operations. Other bits like OBJF_SHARED are
260 simply copied through to the new objfile flags member. */
262 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
263 by jv-lang.c, to create an artificial objfile used to hold
264 information about dynamically-loaded Java classes. Unfortunately,
265 that branch of this function doesn't get tested very frequently, so
266 it's prone to breakage. (E.g. at one time the name was set to NULL
267 in that situation, which broke a loop over all names in the dynamic
268 library loader.) If you change this function, please try to leave
269 things in a consistent state even if abfd is NULL. */
272 allocate_objfile (bfd *abfd, const char *name, int flags)
274 struct objfile *objfile;
277 objfile = (struct objfile *) xzalloc (sizeof (struct objfile));
278 objfile->psymbol_cache = psymbol_bcache_init ();
279 /* We could use obstack_specify_allocation here instead, but
280 gdb_obstack.h specifies the alloc/dealloc functions. */
281 obstack_init (&objfile->objfile_obstack);
282 terminate_minimal_symbol_table (objfile);
284 objfile_alloc_data (objfile);
288 gdb_assert (abfd == NULL);
289 gdb_assert ((flags & OBJF_NOT_FILENAME) != 0);
290 expanded_name = xstrdup ("<<anonymous objfile>>");
292 else if ((flags & OBJF_NOT_FILENAME) != 0)
293 expanded_name = xstrdup (name);
295 expanded_name = gdb_abspath (name);
296 objfile->original_name = obstack_copy0 (&objfile->objfile_obstack,
298 strlen (expanded_name));
299 xfree (expanded_name);
301 /* Update the per-objfile information that comes from the bfd, ensuring
302 that any data that is reference is saved in the per-objfile data
305 /* Update the per-objfile information that comes from the bfd, ensuring
306 that any data that is reference is saved in the per-objfile data
309 objfile->obfd = abfd;
313 objfile->mtime = bfd_get_mtime (abfd);
315 /* Build section table. */
316 build_objfile_section_table (objfile);
319 objfile->per_bfd = get_objfile_bfd_data (objfile, abfd);
320 objfile->pspace = current_program_space;
322 /* Initialize the section indexes for this objfile, so that we can
323 later detect if they are used w/o being properly assigned to. */
325 objfile->sect_index_text = -1;
326 objfile->sect_index_data = -1;
327 objfile->sect_index_bss = -1;
328 objfile->sect_index_rodata = -1;
330 /* Add this file onto the tail of the linked list of other such files. */
332 objfile->next = NULL;
333 if (object_files == NULL)
334 object_files = objfile;
337 struct objfile *last_one;
339 for (last_one = object_files;
341 last_one = last_one->next);
342 last_one->next = objfile;
345 /* Save passed in flag bits. */
346 objfile->flags |= flags;
348 /* Rebuild section map next time we need it. */
349 get_objfile_pspace_data (objfile->pspace)->new_objfiles_available = 1;
354 /* Retrieve the gdbarch associated with OBJFILE. */
356 get_objfile_arch (struct objfile *objfile)
358 return objfile->per_bfd->gdbarch;
361 /* If there is a valid and known entry point, function fills *ENTRY_P with it
362 and returns non-zero; otherwise it returns zero. */
365 entry_point_address_query (CORE_ADDR *entry_p)
367 if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p)
370 *entry_p = symfile_objfile->ei.entry_point;
375 /* Get current entry point address. Call error if it is not known. */
378 entry_point_address (void)
382 if (!entry_point_address_query (&retval))
383 error (_("Entry point address is not known."));
388 /* Iterator on PARENT and every separate debug objfile of PARENT.
389 The usage pattern is:
390 for (objfile = parent;
392 objfile = objfile_separate_debug_iterate (parent, objfile))
397 objfile_separate_debug_iterate (const struct objfile *parent,
398 const struct objfile *objfile)
402 /* If any, return the first child. */
403 res = objfile->separate_debug_objfile;
407 /* Common case where there is no separate debug objfile. */
408 if (objfile == parent)
411 /* Return the brother if any. Note that we don't iterate on brothers of
413 res = objfile->separate_debug_objfile_link;
417 for (res = objfile->separate_debug_objfile_backlink;
419 res = res->separate_debug_objfile_backlink)
421 gdb_assert (res != NULL);
422 if (res->separate_debug_objfile_link)
423 return res->separate_debug_objfile_link;
428 /* Put one object file before a specified on in the global list.
429 This can be used to make sure an object file is destroyed before
430 another when using ALL_OBJFILES_SAFE to free all objfiles. */
432 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
434 struct objfile **objp;
436 unlink_objfile (objfile);
438 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
440 if (*objp == before_this)
442 objfile->next = *objp;
448 internal_error (__FILE__, __LINE__,
449 _("put_objfile_before: before objfile not in list"));
452 /* Put OBJFILE at the front of the list. */
455 objfile_to_front (struct objfile *objfile)
457 struct objfile **objp;
458 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
460 if (*objp == objfile)
462 /* Unhook it from where it is. */
463 *objp = objfile->next;
464 /* Put it in the front. */
465 objfile->next = object_files;
466 object_files = objfile;
472 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
475 It is not a bug, or error, to call this function if OBJFILE is not known
476 to be in the current list. This is done in the case of mapped objfiles,
477 for example, just to ensure that the mapped objfile doesn't appear twice
478 in the list. Since the list is threaded, linking in a mapped objfile
479 twice would create a circular list.
481 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
482 unlinking it, just to ensure that we have completely severed any linkages
483 between the OBJFILE and the list. */
486 unlink_objfile (struct objfile *objfile)
488 struct objfile **objpp;
490 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
492 if (*objpp == objfile)
494 *objpp = (*objpp)->next;
495 objfile->next = NULL;
500 internal_error (__FILE__, __LINE__,
501 _("unlink_objfile: objfile already unlinked"));
504 /* Add OBJFILE as a separate debug objfile of PARENT. */
507 add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent)
509 gdb_assert (objfile && parent);
511 /* Must not be already in a list. */
512 gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
513 gdb_assert (objfile->separate_debug_objfile_link == NULL);
514 gdb_assert (objfile->separate_debug_objfile == NULL);
515 gdb_assert (parent->separate_debug_objfile_backlink == NULL);
516 gdb_assert (parent->separate_debug_objfile_link == NULL);
518 objfile->separate_debug_objfile_backlink = parent;
519 objfile->separate_debug_objfile_link = parent->separate_debug_objfile;
520 parent->separate_debug_objfile = objfile;
522 /* Put the separate debug object before the normal one, this is so that
523 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
524 put_objfile_before (objfile, parent);
527 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
531 free_objfile_separate_debug (struct objfile *objfile)
533 struct objfile *child;
535 for (child = objfile->separate_debug_objfile; child;)
537 struct objfile *next_child = child->separate_debug_objfile_link;
538 free_objfile (child);
543 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
544 that as much as possible is allocated on the objfile_obstack
545 so that the memory can be efficiently freed.
547 Things which we do NOT free because they are not in malloc'd memory
548 or not in memory specific to the objfile include:
552 FIXME: If the objfile is using reusable symbol information (via mmalloc),
553 then we need to take into account the fact that more than one process
554 may be using the symbol information at the same time (when mmalloc is
555 extended to support cooperative locking). When more than one process
556 is using the mapped symbol info, we need to be more careful about when
557 we free objects in the reusable area. */
560 free_objfile (struct objfile *objfile)
562 /* First notify observers that this objfile is about to be freed. */
563 observer_notify_free_objfile (objfile);
565 /* Free all separate debug objfiles. */
566 free_objfile_separate_debug (objfile);
568 if (objfile->separate_debug_objfile_backlink)
570 /* We freed the separate debug file, make sure the base objfile
571 doesn't reference it. */
572 struct objfile *child;
574 child = objfile->separate_debug_objfile_backlink->separate_debug_objfile;
576 if (child == objfile)
578 /* OBJFILE is the first child. */
579 objfile->separate_debug_objfile_backlink->separate_debug_objfile =
580 objfile->separate_debug_objfile_link;
584 /* Find OBJFILE in the list. */
587 if (child->separate_debug_objfile_link == objfile)
589 child->separate_debug_objfile_link =
590 objfile->separate_debug_objfile_link;
593 child = child->separate_debug_objfile_link;
599 /* Remove any references to this objfile in the global value
601 preserve_values (objfile);
603 /* It still may reference data modules have associated with the objfile and
604 the symbol file data. */
605 forget_cached_source_info_for_objfile (objfile);
607 breakpoint_free_objfile (objfile);
608 btrace_free_objfile (objfile);
610 /* First do any symbol file specific actions required when we are
611 finished with a particular symbol file. Note that if the objfile
612 is using reusable symbol information (via mmalloc) then each of
613 these routines is responsible for doing the correct thing, either
614 freeing things which are valid only during this particular gdb
615 execution, or leaving them to be reused during the next one. */
617 if (objfile->sf != NULL)
619 (*objfile->sf->sym_finish) (objfile);
622 /* Discard any data modules have associated with the objfile. The function
623 still may reference objfile->obfd. */
624 objfile_free_data (objfile);
627 gdb_bfd_unref (objfile->obfd);
629 free_objfile_per_bfd_storage (objfile->per_bfd);
631 /* Remove it from the chain of all objfiles. */
633 unlink_objfile (objfile);
635 if (objfile == symfile_objfile)
636 symfile_objfile = NULL;
638 /* Before the symbol table code was redone to make it easier to
639 selectively load and remove information particular to a specific
640 linkage unit, gdb used to do these things whenever the monolithic
641 symbol table was blown away. How much still needs to be done
642 is unknown, but we play it safe for now and keep each action until
643 it is shown to be no longer needed. */
645 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
646 for example), so we need to call this here. */
647 clear_pc_function_cache ();
649 /* Clear globals which might have pointed into a removed objfile.
650 FIXME: It's not clear which of these are supposed to persist
651 between expressions and which ought to be reset each time. */
652 expression_context_block = NULL;
653 innermost_block = NULL;
655 /* Check to see if the current_source_symtab belongs to this objfile,
656 and if so, call clear_current_source_symtab_and_line. */
659 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
661 if (cursal.symtab && cursal.symtab->objfile == objfile)
662 clear_current_source_symtab_and_line ();
665 if (objfile->global_psymbols.list)
666 xfree (objfile->global_psymbols.list);
667 if (objfile->static_psymbols.list)
668 xfree (objfile->static_psymbols.list);
669 /* Free the obstacks for non-reusable objfiles. */
670 psymbol_bcache_free (objfile->psymbol_cache);
671 obstack_free (&objfile->objfile_obstack, 0);
673 /* Rebuild section map next time we need it. */
674 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
676 /* The last thing we do is free the objfile struct itself. */
681 do_free_objfile_cleanup (void *obj)
687 make_cleanup_free_objfile (struct objfile *obj)
689 return make_cleanup (do_free_objfile_cleanup, obj);
692 /* Free all the object files at once and clean up their users. */
695 free_all_objfiles (void)
697 struct objfile *objfile, *temp;
700 /* Any objfile referencewould become stale. */
701 for (so = master_so_list (); so; so = so->next)
702 gdb_assert (so->objfile == NULL);
704 ALL_OBJFILES_SAFE (objfile, temp)
706 free_objfile (objfile);
708 clear_symtab_users (0);
711 /* A helper function for objfile_relocate1 that relocates a single
715 relocate_one_symbol (struct symbol *sym, struct objfile *objfile,
716 struct section_offsets *delta)
718 fixup_symbol_section (sym, objfile);
720 /* The RS6000 code from which this was taken skipped
721 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
722 But I'm leaving out that test, on the theory that
723 they can't possibly pass the tests below. */
724 if ((SYMBOL_CLASS (sym) == LOC_LABEL
725 || SYMBOL_CLASS (sym) == LOC_STATIC)
726 && SYMBOL_SECTION (sym) >= 0)
728 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
732 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
733 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
734 Return non-zero iff any change happened. */
737 objfile_relocate1 (struct objfile *objfile,
738 const struct section_offsets *new_offsets)
740 struct obj_section *s;
741 struct section_offsets *delta =
742 ((struct section_offsets *)
743 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
746 int something_changed = 0;
748 for (i = 0; i < objfile->num_sections; ++i)
751 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
752 if (ANOFFSET (delta, i) != 0)
753 something_changed = 1;
755 if (!something_changed)
758 /* OK, get all the symtabs. */
762 ALL_OBJFILE_SYMTABS (objfile, s)
765 struct blockvector *bv;
768 /* First the line table. */
772 for (i = 0; i < l->nitems; ++i)
773 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
776 /* Don't relocate a shared blockvector more than once. */
780 bv = BLOCKVECTOR (s);
781 if (BLOCKVECTOR_MAP (bv))
782 addrmap_relocate (BLOCKVECTOR_MAP (bv),
783 ANOFFSET (delta, s->block_line_section));
785 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
789 struct dict_iterator iter;
791 b = BLOCKVECTOR_BLOCK (bv, i);
792 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
793 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
795 /* We only want to iterate over the local symbols, not any
796 symbols in included symtabs. */
797 ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym)
799 relocate_one_symbol (sym, objfile, delta);
805 /* Relocate isolated symbols. */
809 for (iter = objfile->template_symbols; iter; iter = iter->hash_next)
810 relocate_one_symbol (iter, objfile, delta);
813 if (objfile->psymtabs_addrmap)
814 addrmap_relocate (objfile->psymtabs_addrmap,
815 ANOFFSET (delta, SECT_OFF_TEXT (objfile)));
818 objfile->sf->qf->relocate (objfile, new_offsets, delta);
821 struct minimal_symbol *msym;
823 ALL_OBJFILE_MSYMBOLS (objfile, msym)
824 if (SYMBOL_SECTION (msym) >= 0)
825 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
827 /* Relocating different sections by different amounts may cause the symbols
828 to be out of order. */
829 msymbols_sort (objfile);
831 if (objfile->ei.entry_point_p)
833 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
834 only as a fallback. */
835 struct obj_section *s;
836 s = find_pc_section (objfile->ei.entry_point);
839 int idx = gdb_bfd_section_index (objfile->obfd, s->the_bfd_section);
841 objfile->ei.entry_point += ANOFFSET (delta, idx);
844 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
850 for (i = 0; i < objfile->num_sections; ++i)
851 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
854 /* Rebuild section map next time we need it. */
855 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
857 /* Update the table in exec_ops, used to read memory. */
858 ALL_OBJFILE_OSECTIONS (objfile, s)
860 int idx = s - objfile->sections;
862 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
863 obj_section_addr (s));
866 /* Relocating probes. */
867 if (objfile->sf && objfile->sf->sym_probe_fns)
868 objfile->sf->sym_probe_fns->sym_relocate_probe (objfile,
875 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
876 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
878 The number and ordering of sections does differ between the two objfiles.
879 Only their names match. Also the file offsets will differ (objfile being
880 possibly prelinked but separate_debug_objfile is probably not prelinked) but
881 the in-memory absolute address as specified by NEW_OFFSETS must match both
885 objfile_relocate (struct objfile *objfile,
886 const struct section_offsets *new_offsets)
888 struct objfile *debug_objfile;
891 changed |= objfile_relocate1 (objfile, new_offsets);
893 for (debug_objfile = objfile->separate_debug_objfile;
895 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
897 struct section_addr_info *objfile_addrs;
898 struct section_offsets *new_debug_offsets;
899 struct cleanup *my_cleanups;
901 objfile_addrs = build_section_addr_info_from_objfile (objfile);
902 my_cleanups = make_cleanup (xfree, objfile_addrs);
904 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
905 relative ones must be already created according to debug_objfile. */
907 addr_info_make_relative (objfile_addrs, debug_objfile->obfd);
909 gdb_assert (debug_objfile->num_sections
910 == gdb_bfd_count_sections (debug_objfile->obfd));
912 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections));
913 make_cleanup (xfree, new_debug_offsets);
914 relative_addr_info_to_section_offsets (new_debug_offsets,
915 debug_objfile->num_sections,
918 changed |= objfile_relocate1 (debug_objfile, new_debug_offsets);
920 do_cleanups (my_cleanups);
923 /* Relocate breakpoints as necessary, after things are relocated. */
925 breakpoint_re_set ();
928 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
930 Return non-zero iff any change happened. */
933 objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
935 struct section_offsets *new_offsets =
936 ((struct section_offsets *)
937 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
940 for (i = 0; i < objfile->num_sections; ++i)
941 new_offsets->offsets[i] = slide;
943 return objfile_relocate1 (objfile, new_offsets);
946 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
947 SEPARATE_DEBUG_OBJFILEs. */
950 objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
952 struct objfile *debug_objfile;
955 changed |= objfile_rebase1 (objfile, slide);
957 for (debug_objfile = objfile->separate_debug_objfile;
959 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
960 changed |= objfile_rebase1 (debug_objfile, slide);
962 /* Relocate breakpoints as necessary, after things are relocated. */
964 breakpoint_re_set ();
967 /* Return non-zero if OBJFILE has partial symbols. */
970 objfile_has_partial_symbols (struct objfile *objfile)
975 /* If we have not read psymbols, but we have a function capable of reading
976 them, then that is an indication that they are in fact available. Without
977 this function the symbols may have been already read in but they also may
978 not be present in this objfile. */
979 if ((objfile->flags & OBJF_PSYMTABS_READ) == 0
980 && objfile->sf->sym_read_psymbols != NULL)
983 return objfile->sf->qf->has_symbols (objfile);
986 /* Return non-zero if OBJFILE has full symbols. */
989 objfile_has_full_symbols (struct objfile *objfile)
991 return objfile->symtabs != NULL;
994 /* Return non-zero if OBJFILE has full or partial symbols, either directly
995 or through a separate debug file. */
998 objfile_has_symbols (struct objfile *objfile)
1002 for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o))
1003 if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o))
1009 /* Many places in gdb want to test just to see if we have any partial
1010 symbols available. This function returns zero if none are currently
1011 available, nonzero otherwise. */
1014 have_partial_symbols (void)
1016 struct objfile *ofp;
1020 if (objfile_has_partial_symbols (ofp))
1026 /* Many places in gdb want to test just to see if we have any full
1027 symbols available. This function returns zero if none are currently
1028 available, nonzero otherwise. */
1031 have_full_symbols (void)
1033 struct objfile *ofp;
1037 if (objfile_has_full_symbols (ofp))
1044 /* This operations deletes all objfile entries that represent solibs that
1045 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1049 objfile_purge_solibs (void)
1051 struct objfile *objf;
1052 struct objfile *temp;
1054 ALL_OBJFILES_SAFE (objf, temp)
1056 /* We assume that the solib package has been purged already, or will
1059 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
1060 free_objfile (objf);
1065 /* Many places in gdb want to test just to see if we have any minimal
1066 symbols available. This function returns zero if none are currently
1067 available, nonzero otherwise. */
1070 have_minimal_symbols (void)
1072 struct objfile *ofp;
1076 if (ofp->minimal_symbol_count > 0)
1084 /* Qsort comparison function. */
1087 qsort_cmp (const void *a, const void *b)
1089 const struct obj_section *sect1 = *(const struct obj_section **) a;
1090 const struct obj_section *sect2 = *(const struct obj_section **) b;
1091 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1092 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1094 if (sect1_addr < sect2_addr)
1096 else if (sect1_addr > sect2_addr)
1100 /* Sections are at the same address. This could happen if
1101 A) we have an objfile and a separate debuginfo.
1102 B) we are confused, and have added sections without proper relocation,
1103 or something like that. */
1105 const struct objfile *const objfile1 = sect1->objfile;
1106 const struct objfile *const objfile2 = sect2->objfile;
1108 if (objfile1->separate_debug_objfile == objfile2
1109 || objfile2->separate_debug_objfile == objfile1)
1111 /* Case A. The ordering doesn't matter: separate debuginfo files
1112 will be filtered out later. */
1117 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1118 triage. This section could be slow (since we iterate over all
1119 objfiles in each call to qsort_cmp), but this shouldn't happen
1120 very often (GDB is already in a confused state; one hopes this
1121 doesn't happen at all). If you discover that significant time is
1122 spent in the loops below, do 'set complaints 100' and examine the
1123 resulting complaints. */
1125 if (objfile1 == objfile2)
1127 /* Both sections came from the same objfile. We are really confused.
1128 Sort on sequence order of sections within the objfile. */
1130 const struct obj_section *osect;
1132 ALL_OBJFILE_OSECTIONS (objfile1, osect)
1135 else if (osect == sect2)
1138 /* We should have found one of the sections before getting here. */
1139 gdb_assert_not_reached ("section not found");
1143 /* Sort on sequence number of the objfile in the chain. */
1145 const struct objfile *objfile;
1147 ALL_OBJFILES (objfile)
1148 if (objfile == objfile1)
1150 else if (objfile == objfile2)
1153 /* We should have found one of the objfiles before getting here. */
1154 gdb_assert_not_reached ("objfile not found");
1159 gdb_assert_not_reached ("unexpected code path");
1163 /* Select "better" obj_section to keep. We prefer the one that came from
1164 the real object, rather than the one from separate debuginfo.
1165 Most of the time the two sections are exactly identical, but with
1166 prelinking the .rel.dyn section in the real object may have different
1169 static struct obj_section *
1170 preferred_obj_section (struct obj_section *a, struct obj_section *b)
1172 gdb_assert (obj_section_addr (a) == obj_section_addr (b));
1173 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile)
1174 || (b->objfile->separate_debug_objfile == a->objfile));
1175 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile)
1176 || (b->objfile->separate_debug_objfile_backlink == a->objfile));
1178 if (a->objfile->separate_debug_objfile != NULL)
1183 /* Return 1 if SECTION should be inserted into the section map.
1184 We want to insert only non-overlay and non-TLS section. */
1187 insert_section_p (const struct bfd *abfd,
1188 const struct bfd_section *section)
1190 const bfd_vma lma = bfd_section_lma (abfd, section);
1192 if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section)
1193 && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0)
1194 /* This is an overlay section. IN_MEMORY check is needed to avoid
1195 discarding sections from the "system supplied DSO" (aka vdso)
1196 on some Linux systems (e.g. Fedora 11). */
1198 if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0)
1199 /* This is a TLS section. */
1205 /* Filter out overlapping sections where one section came from the real
1206 objfile, and the other from a separate debuginfo file.
1207 Return the size of table after redundant sections have been eliminated. */
1210 filter_debuginfo_sections (struct obj_section **map, int map_size)
1214 for (i = 0, j = 0; i < map_size - 1; i++)
1216 struct obj_section *const sect1 = map[i];
1217 struct obj_section *const sect2 = map[i + 1];
1218 const struct objfile *const objfile1 = sect1->objfile;
1219 const struct objfile *const objfile2 = sect2->objfile;
1220 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1221 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1223 if (sect1_addr == sect2_addr
1224 && (objfile1->separate_debug_objfile == objfile2
1225 || objfile2->separate_debug_objfile == objfile1))
1227 map[j++] = preferred_obj_section (sect1, sect2);
1236 gdb_assert (i == map_size - 1);
1240 /* The map should not have shrunk to less than half the original size. */
1241 gdb_assert (map_size / 2 <= j);
1246 /* Filter out overlapping sections, issuing a warning if any are found.
1247 Overlapping sections could really be overlay sections which we didn't
1248 classify as such in insert_section_p, or we could be dealing with a
1252 filter_overlapping_sections (struct obj_section **map, int map_size)
1256 for (i = 0, j = 0; i < map_size - 1; )
1261 for (k = i + 1; k < map_size; k++)
1263 struct obj_section *const sect1 = map[i];
1264 struct obj_section *const sect2 = map[k];
1265 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1266 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1267 const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1);
1269 gdb_assert (sect1_addr <= sect2_addr);
1271 if (sect1_endaddr <= sect2_addr)
1275 /* We have an overlap. Report it. */
1277 struct objfile *const objf1 = sect1->objfile;
1278 struct objfile *const objf2 = sect2->objfile;
1280 const struct bfd_section *const bfds1 = sect1->the_bfd_section;
1281 const struct bfd_section *const bfds2 = sect2->the_bfd_section;
1283 const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2);
1285 struct gdbarch *const gdbarch = get_objfile_arch (objf1);
1287 complaint (&symfile_complaints,
1288 _("unexpected overlap between:\n"
1289 " (A) section `%s' from `%s' [%s, %s)\n"
1290 " (B) section `%s' from `%s' [%s, %s).\n"
1291 "Will ignore section B"),
1292 bfd_section_name (abfd1, bfds1), objfile_name (objf1),
1293 paddress (gdbarch, sect1_addr),
1294 paddress (gdbarch, sect1_endaddr),
1295 bfd_section_name (abfd2, bfds2), objfile_name (objf2),
1296 paddress (gdbarch, sect2_addr),
1297 paddress (gdbarch, sect2_endaddr));
1305 gdb_assert (i == map_size - 1);
1313 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1314 TLS, overlay and overlapping sections. */
1317 update_section_map (struct program_space *pspace,
1318 struct obj_section ***pmap, int *pmap_size)
1320 struct objfile_pspace_info *pspace_info;
1321 int alloc_size, map_size, i;
1322 struct obj_section *s, **map;
1323 struct objfile *objfile;
1325 pspace_info = get_objfile_pspace_data (pspace);
1326 gdb_assert (pspace_info->section_map_dirty != 0
1327 || pspace_info->new_objfiles_available != 0);
1333 ALL_PSPACE_OBJFILES (pspace, objfile)
1334 ALL_OBJFILE_OSECTIONS (objfile, s)
1335 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1338 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1339 if (alloc_size == 0)
1346 map = xmalloc (alloc_size * sizeof (*map));
1349 ALL_PSPACE_OBJFILES (pspace, objfile)
1350 ALL_OBJFILE_OSECTIONS (objfile, s)
1351 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1354 qsort (map, alloc_size, sizeof (*map), qsort_cmp);
1355 map_size = filter_debuginfo_sections(map, alloc_size);
1356 map_size = filter_overlapping_sections(map, map_size);
1358 if (map_size < alloc_size)
1359 /* Some sections were eliminated. Trim excess space. */
1360 map = xrealloc (map, map_size * sizeof (*map));
1362 gdb_assert (alloc_size == map_size);
1365 *pmap_size = map_size;
1368 /* Bsearch comparison function. */
1371 bsearch_cmp (const void *key, const void *elt)
1373 const CORE_ADDR pc = *(CORE_ADDR *) key;
1374 const struct obj_section *section = *(const struct obj_section **) elt;
1376 if (pc < obj_section_addr (section))
1378 if (pc < obj_section_endaddr (section))
1383 /* Returns a section whose range includes PC or NULL if none found. */
1385 struct obj_section *
1386 find_pc_section (CORE_ADDR pc)
1388 struct objfile_pspace_info *pspace_info;
1389 struct obj_section *s, **sp;
1391 /* Check for mapped overlay section first. */
1392 s = find_pc_mapped_section (pc);
1396 pspace_info = get_objfile_pspace_data (current_program_space);
1397 if (pspace_info->section_map_dirty
1398 || (pspace_info->new_objfiles_available
1399 && !pspace_info->inhibit_updates))
1401 update_section_map (current_program_space,
1402 &pspace_info->sections,
1403 &pspace_info->num_sections);
1405 /* Don't need updates to section map until objfiles are added,
1406 removed or relocated. */
1407 pspace_info->new_objfiles_available = 0;
1408 pspace_info->section_map_dirty = 0;
1411 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1412 bsearch be non-NULL. */
1413 if (pspace_info->sections == NULL)
1415 gdb_assert (pspace_info->num_sections == 0);
1419 sp = (struct obj_section **) bsearch (&pc,
1420 pspace_info->sections,
1421 pspace_info->num_sections,
1422 sizeof (*pspace_info->sections),
1430 /* Return non-zero if PC is in a section called NAME. */
1433 pc_in_section (CORE_ADDR pc, char *name)
1435 struct obj_section *s;
1438 s = find_pc_section (pc);
1441 && s->the_bfd_section->name != NULL
1442 && strcmp (s->the_bfd_section->name, name) == 0);
1447 /* Set section_map_dirty so section map will be rebuilt next time it
1448 is used. Called by reread_symbols. */
1451 objfiles_changed (void)
1453 /* Rebuild section map next time we need it. */
1454 get_objfile_pspace_data (current_program_space)->section_map_dirty = 1;
1457 /* See comments in objfiles.h. */
1460 inhibit_section_map_updates (struct program_space *pspace)
1462 get_objfile_pspace_data (pspace)->inhibit_updates = 1;
1465 /* See comments in objfiles.h. */
1468 resume_section_map_updates (struct program_space *pspace)
1470 get_objfile_pspace_data (pspace)->inhibit_updates = 0;
1473 /* See comments in objfiles.h. */
1476 resume_section_map_updates_cleanup (void *arg)
1478 resume_section_map_updates (arg);
1481 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1485 is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile)
1487 struct obj_section *osect;
1489 if (objfile == NULL)
1492 ALL_OBJFILE_OSECTIONS (objfile, osect)
1494 if (section_is_overlay (osect) && !section_is_mapped (osect))
1497 if (obj_section_addr (osect) <= addr
1498 && addr < obj_section_endaddr (osect))
1504 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1505 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1506 searching the objfiles in the order they are stored internally,
1507 ignoring CURRENT_OBJFILE.
1509 On most platorms, it should be close enough to doing the best
1510 we can without some knowledge specific to the architecture. */
1513 default_iterate_over_objfiles_in_search_order
1514 (struct gdbarch *gdbarch,
1515 iterate_over_objfiles_in_search_order_cb_ftype *cb,
1516 void *cb_data, struct objfile *current_objfile)
1519 struct objfile *objfile;
1521 ALL_OBJFILES (objfile)
1523 stop = cb (objfile, cb_data);
1529 /* Return canonical name for OBJFILE. */
1532 objfile_name (const struct objfile *objfile)
1534 if (objfile->obfd != NULL)
1535 return bfd_get_filename (objfile->obfd);
1537 return objfile->original_name;
1540 /* Provide a prototype to silence -Wmissing-prototypes. */
1541 extern initialize_file_ftype _initialize_objfiles;
1544 _initialize_objfiles (void)
1546 objfiles_pspace_data
1547 = register_program_space_data_with_cleanup (NULL,
1548 objfiles_pspace_data_cleanup);
1550 objfiles_bfd_data = register_bfd_data_with_cleanup (NULL,
1551 objfile_bfd_data_free);