1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2014 Free Software Foundation, Inc.
5 Contributed by Cygnus Support, using pieces from other GDB modules.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* This file contains support routines for creating, manipulating, and
23 destroying objfile structures. */
26 #include "bfd.h" /* Binary File Description */
30 #include "gdb-stabs.h"
33 #include "expression.h"
34 #include "parser-defs.h"
36 #include "gdb_assert.h"
37 #include <sys/types.h>
40 #include "gdb_obstack.h"
44 #include "breakpoint.h"
46 #include "dictionary.h"
49 #include "arch-utils.h"
52 #include "complaints.h"
58 /* Keep a registry of per-objfile data-pointers required by other GDB
61 DEFINE_REGISTRY (objfile, REGISTRY_ACCESS_FIELD)
63 /* Externally visible variables that are owned by this module.
64 See declarations in objfile.h for more info. */
66 struct objfile_pspace_info
68 struct obj_section **sections;
71 /* Nonzero if object files have been added since the section map
73 int new_objfiles_available;
75 /* Nonzero if the section map MUST be updated before use. */
76 int section_map_dirty;
78 /* Nonzero if section map updates should be inhibited if possible. */
82 /* Per-program-space data key. */
83 static const struct program_space_data *objfiles_pspace_data;
86 objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg)
88 struct objfile_pspace_info *info = arg;
90 xfree (info->sections);
94 /* Get the current svr4 data. If none is found yet, add it now. This
95 function always returns a valid object. */
97 static struct objfile_pspace_info *
98 get_objfile_pspace_data (struct program_space *pspace)
100 struct objfile_pspace_info *info;
102 info = program_space_data (pspace, objfiles_pspace_data);
105 info = XCNEW (struct objfile_pspace_info);
106 set_program_space_data (pspace, objfiles_pspace_data, info);
114 /* Per-BFD data key. */
116 static const struct bfd_data *objfiles_bfd_data;
118 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
119 NULL, and it already has a per-BFD storage object, use that.
120 Otherwise, allocate a new per-BFD storage object. If ABFD is not
121 NULL, the object is allocated on the BFD; otherwise it is allocated
122 on OBJFILE's obstack. Note that it is not safe to call this
123 multiple times for a given OBJFILE -- it can only be called when
124 allocating or re-initializing OBJFILE. */
126 static struct objfile_per_bfd_storage *
127 get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
129 struct objfile_per_bfd_storage *storage = NULL;
132 storage = bfd_data (abfd, objfiles_bfd_data);
136 /* If the object requires gdb to do relocations, we simply fall
137 back to not sharing data across users. These cases are rare
138 enough that this seems reasonable. */
139 if (abfd != NULL && !gdb_bfd_requires_relocations (abfd))
141 storage = bfd_zalloc (abfd, sizeof (struct objfile_per_bfd_storage));
142 set_bfd_data (abfd, objfiles_bfd_data, storage);
145 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
146 struct objfile_per_bfd_storage);
148 /* Look up the gdbarch associated with the BFD. */
150 storage->gdbarch = gdbarch_from_bfd (abfd);
152 obstack_init (&storage->storage_obstack);
153 storage->filename_cache = bcache_xmalloc (NULL, NULL);
154 storage->macro_cache = bcache_xmalloc (NULL, NULL);
155 storage->language_of_main = language_unknown;
164 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage *storage)
166 bcache_xfree (storage->filename_cache);
167 bcache_xfree (storage->macro_cache);
168 if (storage->demangled_names_hash)
169 htab_delete (storage->demangled_names_hash);
170 obstack_free (&storage->storage_obstack, 0);
173 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
174 cleanup function to the BFD registry. */
177 objfile_bfd_data_free (struct bfd *unused, void *d)
179 free_objfile_per_bfd_storage (d);
182 /* See objfiles.h. */
185 set_objfile_per_bfd (struct objfile *objfile)
187 objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
190 /* Set the objfile's per-BFD notion of the "main" name and
194 set_objfile_main_name (struct objfile *objfile,
195 const char *name, enum language lang)
197 if (objfile->per_bfd->name_of_main == NULL
198 || strcmp (objfile->per_bfd->name_of_main, name) != 0)
199 objfile->per_bfd->name_of_main
200 = obstack_copy0 (&objfile->per_bfd->storage_obstack, name, strlen (name));
201 objfile->per_bfd->language_of_main = lang;
206 /* Called via bfd_map_over_sections to build up the section table that
207 the objfile references. The objfile contains pointers to the start
208 of the table (objfile->sections) and to the first location after
209 the end of the table (objfile->sections_end). */
212 add_to_objfile_sections_full (struct bfd *abfd, struct bfd_section *asect,
213 struct objfile *objfile, int force)
215 struct obj_section *section;
221 aflag = bfd_get_section_flags (abfd, asect);
222 if (!(aflag & SEC_ALLOC))
226 section = &objfile->sections[gdb_bfd_section_index (abfd, asect)];
227 section->objfile = objfile;
228 section->the_bfd_section = asect;
229 section->ovly_mapped = 0;
233 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
236 add_to_objfile_sections_full (abfd, asect, objfilep, 0);
239 /* Builds a section table for OBJFILE.
241 Note that the OFFSET and OVLY_MAPPED in each table entry are
242 initialized to zero. */
245 build_objfile_section_table (struct objfile *objfile)
247 int count = gdb_bfd_count_sections (objfile->obfd);
249 objfile->sections = OBSTACK_CALLOC (&objfile->objfile_obstack,
252 objfile->sections_end = (objfile->sections + count);
253 bfd_map_over_sections (objfile->obfd,
254 add_to_objfile_sections, (void *) objfile);
256 /* See gdb_bfd_section_index. */
257 add_to_objfile_sections_full (objfile->obfd, bfd_com_section_ptr, objfile, 1);
258 add_to_objfile_sections_full (objfile->obfd, bfd_und_section_ptr, objfile, 1);
259 add_to_objfile_sections_full (objfile->obfd, bfd_abs_section_ptr, objfile, 1);
260 add_to_objfile_sections_full (objfile->obfd, bfd_ind_section_ptr, objfile, 1);
263 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
264 allocate a new objfile struct, fill it in as best we can, link it
265 into the list of all known objfiles, and return a pointer to the
268 NAME should contain original non-canonicalized filename or other
269 identifier as entered by user. If there is no better source use
270 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
271 NAME content is copied into returned objfile.
273 The FLAGS word contains various bits (OBJF_*) that can be taken as
274 requests for specific operations. Other bits like OBJF_SHARED are
275 simply copied through to the new objfile flags member. */
277 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
278 by jv-lang.c, to create an artificial objfile used to hold
279 information about dynamically-loaded Java classes. Unfortunately,
280 that branch of this function doesn't get tested very frequently, so
281 it's prone to breakage. (E.g. at one time the name was set to NULL
282 in that situation, which broke a loop over all names in the dynamic
283 library loader.) If you change this function, please try to leave
284 things in a consistent state even if abfd is NULL. */
287 allocate_objfile (bfd *abfd, const char *name, int flags)
289 struct objfile *objfile;
292 objfile = (struct objfile *) xzalloc (sizeof (struct objfile));
293 objfile->psymbol_cache = psymbol_bcache_init ();
294 /* We could use obstack_specify_allocation here instead, but
295 gdb_obstack.h specifies the alloc/dealloc functions. */
296 obstack_init (&objfile->objfile_obstack);
298 objfile_alloc_data (objfile);
302 gdb_assert (abfd == NULL);
303 gdb_assert ((flags & OBJF_NOT_FILENAME) != 0);
304 expanded_name = xstrdup ("<<anonymous objfile>>");
306 else if ((flags & OBJF_NOT_FILENAME) != 0)
307 expanded_name = xstrdup (name);
309 expanded_name = gdb_abspath (name);
310 objfile->original_name = obstack_copy0 (&objfile->objfile_obstack,
312 strlen (expanded_name));
313 xfree (expanded_name);
315 /* Update the per-objfile information that comes from the bfd, ensuring
316 that any data that is reference is saved in the per-objfile data
319 /* Update the per-objfile information that comes from the bfd, ensuring
320 that any data that is reference is saved in the per-objfile data
323 objfile->obfd = abfd;
327 objfile->mtime = bfd_get_mtime (abfd);
329 /* Build section table. */
330 build_objfile_section_table (objfile);
333 objfile->per_bfd = get_objfile_bfd_data (objfile, abfd);
334 objfile->pspace = current_program_space;
336 terminate_minimal_symbol_table (objfile);
338 /* Initialize the section indexes for this objfile, so that we can
339 later detect if they are used w/o being properly assigned to. */
341 objfile->sect_index_text = -1;
342 objfile->sect_index_data = -1;
343 objfile->sect_index_bss = -1;
344 objfile->sect_index_rodata = -1;
346 /* Add this file onto the tail of the linked list of other such files. */
348 objfile->next = NULL;
349 if (object_files == NULL)
350 object_files = objfile;
353 struct objfile *last_one;
355 for (last_one = object_files;
357 last_one = last_one->next);
358 last_one->next = objfile;
361 /* Save passed in flag bits. */
362 objfile->flags |= flags;
364 /* Rebuild section map next time we need it. */
365 get_objfile_pspace_data (objfile->pspace)->new_objfiles_available = 1;
370 /* Retrieve the gdbarch associated with OBJFILE. */
372 get_objfile_arch (struct objfile *objfile)
374 return objfile->per_bfd->gdbarch;
377 /* If there is a valid and known entry point, function fills *ENTRY_P with it
378 and returns non-zero; otherwise it returns zero. */
381 entry_point_address_query (CORE_ADDR *entry_p)
383 if (symfile_objfile == NULL || !symfile_objfile->per_bfd->ei.entry_point_p)
386 *entry_p = (symfile_objfile->per_bfd->ei.entry_point
387 + ANOFFSET (symfile_objfile->section_offsets,
388 symfile_objfile->per_bfd->ei.the_bfd_section_index));
393 /* Get current entry point address. Call error if it is not known. */
396 entry_point_address (void)
400 if (!entry_point_address_query (&retval))
401 error (_("Entry point address is not known."));
406 /* Iterator on PARENT and every separate debug objfile of PARENT.
407 The usage pattern is:
408 for (objfile = parent;
410 objfile = objfile_separate_debug_iterate (parent, objfile))
415 objfile_separate_debug_iterate (const struct objfile *parent,
416 const struct objfile *objfile)
420 /* If any, return the first child. */
421 res = objfile->separate_debug_objfile;
425 /* Common case where there is no separate debug objfile. */
426 if (objfile == parent)
429 /* Return the brother if any. Note that we don't iterate on brothers of
431 res = objfile->separate_debug_objfile_link;
435 for (res = objfile->separate_debug_objfile_backlink;
437 res = res->separate_debug_objfile_backlink)
439 gdb_assert (res != NULL);
440 if (res->separate_debug_objfile_link)
441 return res->separate_debug_objfile_link;
446 /* Put one object file before a specified on in the global list.
447 This can be used to make sure an object file is destroyed before
448 another when using ALL_OBJFILES_SAFE to free all objfiles. */
450 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
452 struct objfile **objp;
454 unlink_objfile (objfile);
456 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
458 if (*objp == before_this)
460 objfile->next = *objp;
466 internal_error (__FILE__, __LINE__,
467 _("put_objfile_before: before objfile not in list"));
470 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
473 It is not a bug, or error, to call this function if OBJFILE is not known
474 to be in the current list. This is done in the case of mapped objfiles,
475 for example, just to ensure that the mapped objfile doesn't appear twice
476 in the list. Since the list is threaded, linking in a mapped objfile
477 twice would create a circular list.
479 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
480 unlinking it, just to ensure that we have completely severed any linkages
481 between the OBJFILE and the list. */
484 unlink_objfile (struct objfile *objfile)
486 struct objfile **objpp;
488 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
490 if (*objpp == objfile)
492 *objpp = (*objpp)->next;
493 objfile->next = NULL;
498 internal_error (__FILE__, __LINE__,
499 _("unlink_objfile: objfile already unlinked"));
502 /* Add OBJFILE as a separate debug objfile of PARENT. */
505 add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent)
507 gdb_assert (objfile && parent);
509 /* Must not be already in a list. */
510 gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
511 gdb_assert (objfile->separate_debug_objfile_link == NULL);
512 gdb_assert (objfile->separate_debug_objfile == NULL);
513 gdb_assert (parent->separate_debug_objfile_backlink == NULL);
514 gdb_assert (parent->separate_debug_objfile_link == NULL);
516 objfile->separate_debug_objfile_backlink = parent;
517 objfile->separate_debug_objfile_link = parent->separate_debug_objfile;
518 parent->separate_debug_objfile = objfile;
520 /* Put the separate debug object before the normal one, this is so that
521 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
522 put_objfile_before (objfile, parent);
525 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
529 free_objfile_separate_debug (struct objfile *objfile)
531 struct objfile *child;
533 for (child = objfile->separate_debug_objfile; child;)
535 struct objfile *next_child = child->separate_debug_objfile_link;
536 free_objfile (child);
541 /* Destroy an objfile and all the symtabs and psymtabs under it. */
544 free_objfile (struct objfile *objfile)
546 /* First notify observers that this objfile is about to be freed. */
547 observer_notify_free_objfile (objfile);
549 /* Free all separate debug objfiles. */
550 free_objfile_separate_debug (objfile);
552 if (objfile->separate_debug_objfile_backlink)
554 /* We freed the separate debug file, make sure the base objfile
555 doesn't reference it. */
556 struct objfile *child;
558 child = objfile->separate_debug_objfile_backlink->separate_debug_objfile;
560 if (child == objfile)
562 /* OBJFILE is the first child. */
563 objfile->separate_debug_objfile_backlink->separate_debug_objfile =
564 objfile->separate_debug_objfile_link;
568 /* Find OBJFILE in the list. */
571 if (child->separate_debug_objfile_link == objfile)
573 child->separate_debug_objfile_link =
574 objfile->separate_debug_objfile_link;
577 child = child->separate_debug_objfile_link;
583 /* Remove any references to this objfile in the global value
585 preserve_values (objfile);
587 /* It still may reference data modules have associated with the objfile and
588 the symbol file data. */
589 forget_cached_source_info_for_objfile (objfile);
591 breakpoint_free_objfile (objfile);
592 btrace_free_objfile (objfile);
594 /* First do any symbol file specific actions required when we are
595 finished with a particular symbol file. Note that if the objfile
596 is using reusable symbol information (via mmalloc) then each of
597 these routines is responsible for doing the correct thing, either
598 freeing things which are valid only during this particular gdb
599 execution, or leaving them to be reused during the next one. */
601 if (objfile->sf != NULL)
603 (*objfile->sf->sym_finish) (objfile);
606 /* Discard any data modules have associated with the objfile. The function
607 still may reference objfile->obfd. */
608 objfile_free_data (objfile);
611 gdb_bfd_unref (objfile->obfd);
613 free_objfile_per_bfd_storage (objfile->per_bfd);
615 /* Remove it from the chain of all objfiles. */
617 unlink_objfile (objfile);
619 if (objfile == symfile_objfile)
620 symfile_objfile = NULL;
622 /* Before the symbol table code was redone to make it easier to
623 selectively load and remove information particular to a specific
624 linkage unit, gdb used to do these things whenever the monolithic
625 symbol table was blown away. How much still needs to be done
626 is unknown, but we play it safe for now and keep each action until
627 it is shown to be no longer needed. */
629 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
630 for example), so we need to call this here. */
631 clear_pc_function_cache ();
633 /* Clear globals which might have pointed into a removed objfile.
634 FIXME: It's not clear which of these are supposed to persist
635 between expressions and which ought to be reset each time. */
636 expression_context_block = NULL;
637 innermost_block = NULL;
639 /* Check to see if the current_source_symtab belongs to this objfile,
640 and if so, call clear_current_source_symtab_and_line. */
643 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
645 if (cursal.symtab && cursal.symtab->objfile == objfile)
646 clear_current_source_symtab_and_line ();
649 if (objfile->global_psymbols.list)
650 xfree (objfile->global_psymbols.list);
651 if (objfile->static_psymbols.list)
652 xfree (objfile->static_psymbols.list);
653 /* Free the obstacks for non-reusable objfiles. */
654 psymbol_bcache_free (objfile->psymbol_cache);
655 obstack_free (&objfile->objfile_obstack, 0);
657 /* Rebuild section map next time we need it. */
658 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
660 /* The last thing we do is free the objfile struct itself. */
665 do_free_objfile_cleanup (void *obj)
671 make_cleanup_free_objfile (struct objfile *obj)
673 return make_cleanup (do_free_objfile_cleanup, obj);
676 /* Free all the object files at once and clean up their users. */
679 free_all_objfiles (void)
681 struct objfile *objfile, *temp;
684 /* Any objfile referencewould become stale. */
685 for (so = master_so_list (); so; so = so->next)
686 gdb_assert (so->objfile == NULL);
688 ALL_OBJFILES_SAFE (objfile, temp)
690 free_objfile (objfile);
692 clear_symtab_users (0);
695 /* A helper function for objfile_relocate1 that relocates a single
699 relocate_one_symbol (struct symbol *sym, struct objfile *objfile,
700 struct section_offsets *delta)
702 fixup_symbol_section (sym, objfile);
704 /* The RS6000 code from which this was taken skipped
705 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
706 But I'm leaving out that test, on the theory that
707 they can't possibly pass the tests below. */
708 if ((SYMBOL_CLASS (sym) == LOC_LABEL
709 || SYMBOL_CLASS (sym) == LOC_STATIC)
710 && SYMBOL_SECTION (sym) >= 0)
712 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
716 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
717 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
718 Return non-zero iff any change happened. */
721 objfile_relocate1 (struct objfile *objfile,
722 const struct section_offsets *new_offsets)
724 struct obj_section *s;
725 struct section_offsets *delta =
726 ((struct section_offsets *)
727 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
730 int something_changed = 0;
732 for (i = 0; i < objfile->num_sections; ++i)
735 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
736 if (ANOFFSET (delta, i) != 0)
737 something_changed = 1;
739 if (!something_changed)
742 /* OK, get all the symtabs. */
746 ALL_OBJFILE_SYMTABS (objfile, s)
749 struct blockvector *bv;
752 /* First the line table. */
756 for (i = 0; i < l->nitems; ++i)
757 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
760 /* Don't relocate a shared blockvector more than once. */
764 bv = BLOCKVECTOR (s);
765 if (BLOCKVECTOR_MAP (bv))
766 addrmap_relocate (BLOCKVECTOR_MAP (bv),
767 ANOFFSET (delta, s->block_line_section));
769 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
773 struct dict_iterator iter;
775 b = BLOCKVECTOR_BLOCK (bv, i);
776 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
777 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
779 /* We only want to iterate over the local symbols, not any
780 symbols in included symtabs. */
781 ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym)
783 relocate_one_symbol (sym, objfile, delta);
789 /* Relocate isolated symbols. */
793 for (iter = objfile->template_symbols; iter; iter = iter->hash_next)
794 relocate_one_symbol (iter, objfile, delta);
797 if (objfile->psymtabs_addrmap)
798 addrmap_relocate (objfile->psymtabs_addrmap,
799 ANOFFSET (delta, SECT_OFF_TEXT (objfile)));
802 objfile->sf->qf->relocate (objfile, new_offsets, delta);
807 for (i = 0; i < objfile->num_sections; ++i)
808 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
811 /* Rebuild section map next time we need it. */
812 get_objfile_pspace_data (objfile->pspace)->section_map_dirty = 1;
814 /* Update the table in exec_ops, used to read memory. */
815 ALL_OBJFILE_OSECTIONS (objfile, s)
817 int idx = s - objfile->sections;
819 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
820 obj_section_addr (s));
823 /* Relocating probes. */
824 if (objfile->sf && objfile->sf->sym_probe_fns)
825 objfile->sf->sym_probe_fns->sym_relocate_probe (objfile,
832 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
833 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
835 The number and ordering of sections does differ between the two objfiles.
836 Only their names match. Also the file offsets will differ (objfile being
837 possibly prelinked but separate_debug_objfile is probably not prelinked) but
838 the in-memory absolute address as specified by NEW_OFFSETS must match both
842 objfile_relocate (struct objfile *objfile,
843 const struct section_offsets *new_offsets)
845 struct objfile *debug_objfile;
848 changed |= objfile_relocate1 (objfile, new_offsets);
850 for (debug_objfile = objfile->separate_debug_objfile;
852 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
854 struct section_addr_info *objfile_addrs;
855 struct section_offsets *new_debug_offsets;
856 struct cleanup *my_cleanups;
858 objfile_addrs = build_section_addr_info_from_objfile (objfile);
859 my_cleanups = make_cleanup (xfree, objfile_addrs);
861 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
862 relative ones must be already created according to debug_objfile. */
864 addr_info_make_relative (objfile_addrs, debug_objfile->obfd);
866 gdb_assert (debug_objfile->num_sections
867 == gdb_bfd_count_sections (debug_objfile->obfd));
869 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile->num_sections));
870 make_cleanup (xfree, new_debug_offsets);
871 relative_addr_info_to_section_offsets (new_debug_offsets,
872 debug_objfile->num_sections,
875 changed |= objfile_relocate1 (debug_objfile, new_debug_offsets);
877 do_cleanups (my_cleanups);
880 /* Relocate breakpoints as necessary, after things are relocated. */
882 breakpoint_re_set ();
885 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
887 Return non-zero iff any change happened. */
890 objfile_rebase1 (struct objfile *objfile, CORE_ADDR slide)
892 struct section_offsets *new_offsets =
893 ((struct section_offsets *)
894 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
897 for (i = 0; i < objfile->num_sections; ++i)
898 new_offsets->offsets[i] = slide;
900 return objfile_relocate1 (objfile, new_offsets);
903 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
904 SEPARATE_DEBUG_OBJFILEs. */
907 objfile_rebase (struct objfile *objfile, CORE_ADDR slide)
909 struct objfile *debug_objfile;
912 changed |= objfile_rebase1 (objfile, slide);
914 for (debug_objfile = objfile->separate_debug_objfile;
916 debug_objfile = objfile_separate_debug_iterate (objfile, debug_objfile))
917 changed |= objfile_rebase1 (debug_objfile, slide);
919 /* Relocate breakpoints as necessary, after things are relocated. */
921 breakpoint_re_set ();
924 /* Return non-zero if OBJFILE has partial symbols. */
927 objfile_has_partial_symbols (struct objfile *objfile)
932 /* If we have not read psymbols, but we have a function capable of reading
933 them, then that is an indication that they are in fact available. Without
934 this function the symbols may have been already read in but they also may
935 not be present in this objfile. */
936 if ((objfile->flags & OBJF_PSYMTABS_READ) == 0
937 && objfile->sf->sym_read_psymbols != NULL)
940 return objfile->sf->qf->has_symbols (objfile);
943 /* Return non-zero if OBJFILE has full symbols. */
946 objfile_has_full_symbols (struct objfile *objfile)
948 return objfile->symtabs != NULL;
951 /* Return non-zero if OBJFILE has full or partial symbols, either directly
952 or through a separate debug file. */
955 objfile_has_symbols (struct objfile *objfile)
959 for (o = objfile; o; o = objfile_separate_debug_iterate (objfile, o))
960 if (objfile_has_partial_symbols (o) || objfile_has_full_symbols (o))
966 /* Many places in gdb want to test just to see if we have any partial
967 symbols available. This function returns zero if none are currently
968 available, nonzero otherwise. */
971 have_partial_symbols (void)
977 if (objfile_has_partial_symbols (ofp))
983 /* Many places in gdb want to test just to see if we have any full
984 symbols available. This function returns zero if none are currently
985 available, nonzero otherwise. */
988 have_full_symbols (void)
994 if (objfile_has_full_symbols (ofp))
1001 /* This operations deletes all objfile entries that represent solibs that
1002 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1006 objfile_purge_solibs (void)
1008 struct objfile *objf;
1009 struct objfile *temp;
1011 ALL_OBJFILES_SAFE (objf, temp)
1013 /* We assume that the solib package has been purged already, or will
1016 if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED))
1017 free_objfile (objf);
1022 /* Many places in gdb want to test just to see if we have any minimal
1023 symbols available. This function returns zero if none are currently
1024 available, nonzero otherwise. */
1027 have_minimal_symbols (void)
1029 struct objfile *ofp;
1033 if (ofp->per_bfd->minimal_symbol_count > 0)
1041 /* Qsort comparison function. */
1044 qsort_cmp (const void *a, const void *b)
1046 const struct obj_section *sect1 = *(const struct obj_section **) a;
1047 const struct obj_section *sect2 = *(const struct obj_section **) b;
1048 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1049 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1051 if (sect1_addr < sect2_addr)
1053 else if (sect1_addr > sect2_addr)
1057 /* Sections are at the same address. This could happen if
1058 A) we have an objfile and a separate debuginfo.
1059 B) we are confused, and have added sections without proper relocation,
1060 or something like that. */
1062 const struct objfile *const objfile1 = sect1->objfile;
1063 const struct objfile *const objfile2 = sect2->objfile;
1065 if (objfile1->separate_debug_objfile == objfile2
1066 || objfile2->separate_debug_objfile == objfile1)
1068 /* Case A. The ordering doesn't matter: separate debuginfo files
1069 will be filtered out later. */
1074 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1075 triage. This section could be slow (since we iterate over all
1076 objfiles in each call to qsort_cmp), but this shouldn't happen
1077 very often (GDB is already in a confused state; one hopes this
1078 doesn't happen at all). If you discover that significant time is
1079 spent in the loops below, do 'set complaints 100' and examine the
1080 resulting complaints. */
1082 if (objfile1 == objfile2)
1084 /* Both sections came from the same objfile. We are really confused.
1085 Sort on sequence order of sections within the objfile. */
1087 const struct obj_section *osect;
1089 ALL_OBJFILE_OSECTIONS (objfile1, osect)
1092 else if (osect == sect2)
1095 /* We should have found one of the sections before getting here. */
1096 gdb_assert_not_reached ("section not found");
1100 /* Sort on sequence number of the objfile in the chain. */
1102 const struct objfile *objfile;
1104 ALL_OBJFILES (objfile)
1105 if (objfile == objfile1)
1107 else if (objfile == objfile2)
1110 /* We should have found one of the objfiles before getting here. */
1111 gdb_assert_not_reached ("objfile not found");
1116 gdb_assert_not_reached ("unexpected code path");
1120 /* Select "better" obj_section to keep. We prefer the one that came from
1121 the real object, rather than the one from separate debuginfo.
1122 Most of the time the two sections are exactly identical, but with
1123 prelinking the .rel.dyn section in the real object may have different
1126 static struct obj_section *
1127 preferred_obj_section (struct obj_section *a, struct obj_section *b)
1129 gdb_assert (obj_section_addr (a) == obj_section_addr (b));
1130 gdb_assert ((a->objfile->separate_debug_objfile == b->objfile)
1131 || (b->objfile->separate_debug_objfile == a->objfile));
1132 gdb_assert ((a->objfile->separate_debug_objfile_backlink == b->objfile)
1133 || (b->objfile->separate_debug_objfile_backlink == a->objfile));
1135 if (a->objfile->separate_debug_objfile != NULL)
1140 /* Return 1 if SECTION should be inserted into the section map.
1141 We want to insert only non-overlay and non-TLS section. */
1144 insert_section_p (const struct bfd *abfd,
1145 const struct bfd_section *section)
1147 const bfd_vma lma = bfd_section_lma (abfd, section);
1149 if (overlay_debugging && lma != 0 && lma != bfd_section_vma (abfd, section)
1150 && (bfd_get_file_flags (abfd) & BFD_IN_MEMORY) == 0)
1151 /* This is an overlay section. IN_MEMORY check is needed to avoid
1152 discarding sections from the "system supplied DSO" (aka vdso)
1153 on some Linux systems (e.g. Fedora 11). */
1155 if ((bfd_get_section_flags (abfd, section) & SEC_THREAD_LOCAL) != 0)
1156 /* This is a TLS section. */
1162 /* Filter out overlapping sections where one section came from the real
1163 objfile, and the other from a separate debuginfo file.
1164 Return the size of table after redundant sections have been eliminated. */
1167 filter_debuginfo_sections (struct obj_section **map, int map_size)
1171 for (i = 0, j = 0; i < map_size - 1; i++)
1173 struct obj_section *const sect1 = map[i];
1174 struct obj_section *const sect2 = map[i + 1];
1175 const struct objfile *const objfile1 = sect1->objfile;
1176 const struct objfile *const objfile2 = sect2->objfile;
1177 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1178 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1180 if (sect1_addr == sect2_addr
1181 && (objfile1->separate_debug_objfile == objfile2
1182 || objfile2->separate_debug_objfile == objfile1))
1184 map[j++] = preferred_obj_section (sect1, sect2);
1193 gdb_assert (i == map_size - 1);
1197 /* The map should not have shrunk to less than half the original size. */
1198 gdb_assert (map_size / 2 <= j);
1203 /* Filter out overlapping sections, issuing a warning if any are found.
1204 Overlapping sections could really be overlay sections which we didn't
1205 classify as such in insert_section_p, or we could be dealing with a
1209 filter_overlapping_sections (struct obj_section **map, int map_size)
1213 for (i = 0, j = 0; i < map_size - 1; )
1218 for (k = i + 1; k < map_size; k++)
1220 struct obj_section *const sect1 = map[i];
1221 struct obj_section *const sect2 = map[k];
1222 const CORE_ADDR sect1_addr = obj_section_addr (sect1);
1223 const CORE_ADDR sect2_addr = obj_section_addr (sect2);
1224 const CORE_ADDR sect1_endaddr = obj_section_endaddr (sect1);
1226 gdb_assert (sect1_addr <= sect2_addr);
1228 if (sect1_endaddr <= sect2_addr)
1232 /* We have an overlap. Report it. */
1234 struct objfile *const objf1 = sect1->objfile;
1235 struct objfile *const objf2 = sect2->objfile;
1237 const struct bfd_section *const bfds1 = sect1->the_bfd_section;
1238 const struct bfd_section *const bfds2 = sect2->the_bfd_section;
1240 const CORE_ADDR sect2_endaddr = obj_section_endaddr (sect2);
1242 struct gdbarch *const gdbarch = get_objfile_arch (objf1);
1244 complaint (&symfile_complaints,
1245 _("unexpected overlap between:\n"
1246 " (A) section `%s' from `%s' [%s, %s)\n"
1247 " (B) section `%s' from `%s' [%s, %s).\n"
1248 "Will ignore section B"),
1249 bfd_section_name (abfd1, bfds1), objfile_name (objf1),
1250 paddress (gdbarch, sect1_addr),
1251 paddress (gdbarch, sect1_endaddr),
1252 bfd_section_name (abfd2, bfds2), objfile_name (objf2),
1253 paddress (gdbarch, sect2_addr),
1254 paddress (gdbarch, sect2_endaddr));
1262 gdb_assert (i == map_size - 1);
1270 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1271 TLS, overlay and overlapping sections. */
1274 update_section_map (struct program_space *pspace,
1275 struct obj_section ***pmap, int *pmap_size)
1277 struct objfile_pspace_info *pspace_info;
1278 int alloc_size, map_size, i;
1279 struct obj_section *s, **map;
1280 struct objfile *objfile;
1282 pspace_info = get_objfile_pspace_data (pspace);
1283 gdb_assert (pspace_info->section_map_dirty != 0
1284 || pspace_info->new_objfiles_available != 0);
1290 ALL_PSPACE_OBJFILES (pspace, objfile)
1291 ALL_OBJFILE_OSECTIONS (objfile, s)
1292 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1295 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1296 if (alloc_size == 0)
1303 map = xmalloc (alloc_size * sizeof (*map));
1306 ALL_PSPACE_OBJFILES (pspace, objfile)
1307 ALL_OBJFILE_OSECTIONS (objfile, s)
1308 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1311 qsort (map, alloc_size, sizeof (*map), qsort_cmp);
1312 map_size = filter_debuginfo_sections(map, alloc_size);
1313 map_size = filter_overlapping_sections(map, map_size);
1315 if (map_size < alloc_size)
1316 /* Some sections were eliminated. Trim excess space. */
1317 map = xrealloc (map, map_size * sizeof (*map));
1319 gdb_assert (alloc_size == map_size);
1322 *pmap_size = map_size;
1325 /* Bsearch comparison function. */
1328 bsearch_cmp (const void *key, const void *elt)
1330 const CORE_ADDR pc = *(CORE_ADDR *) key;
1331 const struct obj_section *section = *(const struct obj_section **) elt;
1333 if (pc < obj_section_addr (section))
1335 if (pc < obj_section_endaddr (section))
1340 /* Returns a section whose range includes PC or NULL if none found. */
1342 struct obj_section *
1343 find_pc_section (CORE_ADDR pc)
1345 struct objfile_pspace_info *pspace_info;
1346 struct obj_section *s, **sp;
1348 /* Check for mapped overlay section first. */
1349 s = find_pc_mapped_section (pc);
1353 pspace_info = get_objfile_pspace_data (current_program_space);
1354 if (pspace_info->section_map_dirty
1355 || (pspace_info->new_objfiles_available
1356 && !pspace_info->inhibit_updates))
1358 update_section_map (current_program_space,
1359 &pspace_info->sections,
1360 &pspace_info->num_sections);
1362 /* Don't need updates to section map until objfiles are added,
1363 removed or relocated. */
1364 pspace_info->new_objfiles_available = 0;
1365 pspace_info->section_map_dirty = 0;
1368 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1369 bsearch be non-NULL. */
1370 if (pspace_info->sections == NULL)
1372 gdb_assert (pspace_info->num_sections == 0);
1376 sp = (struct obj_section **) bsearch (&pc,
1377 pspace_info->sections,
1378 pspace_info->num_sections,
1379 sizeof (*pspace_info->sections),
1387 /* Return non-zero if PC is in a section called NAME. */
1390 pc_in_section (CORE_ADDR pc, char *name)
1392 struct obj_section *s;
1395 s = find_pc_section (pc);
1398 && s->the_bfd_section->name != NULL
1399 && strcmp (s->the_bfd_section->name, name) == 0);
1404 /* Set section_map_dirty so section map will be rebuilt next time it
1405 is used. Called by reread_symbols. */
1408 objfiles_changed (void)
1410 /* Rebuild section map next time we need it. */
1411 get_objfile_pspace_data (current_program_space)->section_map_dirty = 1;
1414 /* See comments in objfiles.h. */
1417 inhibit_section_map_updates (struct program_space *pspace)
1419 get_objfile_pspace_data (pspace)->inhibit_updates = 1;
1422 /* See comments in objfiles.h. */
1425 resume_section_map_updates (struct program_space *pspace)
1427 get_objfile_pspace_data (pspace)->inhibit_updates = 0;
1430 /* See comments in objfiles.h. */
1433 resume_section_map_updates_cleanup (void *arg)
1435 resume_section_map_updates (arg);
1438 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1442 is_addr_in_objfile (CORE_ADDR addr, const struct objfile *objfile)
1444 struct obj_section *osect;
1446 if (objfile == NULL)
1449 ALL_OBJFILE_OSECTIONS (objfile, osect)
1451 if (section_is_overlay (osect) && !section_is_mapped (osect))
1454 if (obj_section_addr (osect) <= addr
1455 && addr < obj_section_endaddr (osect))
1461 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1462 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1463 searching the objfiles in the order they are stored internally,
1464 ignoring CURRENT_OBJFILE.
1466 On most platorms, it should be close enough to doing the best
1467 we can without some knowledge specific to the architecture. */
1470 default_iterate_over_objfiles_in_search_order
1471 (struct gdbarch *gdbarch,
1472 iterate_over_objfiles_in_search_order_cb_ftype *cb,
1473 void *cb_data, struct objfile *current_objfile)
1476 struct objfile *objfile;
1478 ALL_OBJFILES (objfile)
1480 stop = cb (objfile, cb_data);
1486 /* Return canonical name for OBJFILE. */
1489 objfile_name (const struct objfile *objfile)
1491 if (objfile->obfd != NULL)
1492 return bfd_get_filename (objfile->obfd);
1494 return objfile->original_name;
1497 /* Provide a prototype to silence -Wmissing-prototypes. */
1498 extern initialize_file_ftype _initialize_objfiles;
1501 _initialize_objfiles (void)
1503 objfiles_pspace_data
1504 = register_program_space_data_with_cleanup (NULL,
1505 objfiles_pspace_data_cleanup);
1507 objfiles_bfd_data = register_bfd_data_with_cleanup (NULL,
1508 objfile_bfd_data_free);