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"
41 #include "gdb_string.h"
44 #include "breakpoint.h"
46 #include "dictionary.h"
49 #include "arch-utils.h"
52 #include "complaints.h"
57 /* Keep a registry of per-objfile data-pointers required by other GDB
60 DEFINE_REGISTRY (objfile, REGISTRY_ACCESS_FIELD)
62 /* Externally visible variables that are owned by this module.
63 See declarations in objfile.h for more info. */
65 struct objfile *rt_common_objfile; /* For runtime common symbols */
67 struct objfile_pspace_info
69 int objfiles_changed_p;
70 struct obj_section **sections;
74 /* Per-program-space data key. */
75 static const struct program_space_data *objfiles_pspace_data;
78 objfiles_pspace_data_cleanup (struct program_space *pspace, void *arg)
80 struct objfile_pspace_info *info;
82 info = program_space_data (pspace, objfiles_pspace_data);
85 xfree (info->sections);
90 /* Get the current svr4 data. If none is found yet, add it now. This
91 function always returns a valid object. */
93 static struct objfile_pspace_info *
94 get_objfile_pspace_data (struct program_space *pspace)
96 struct objfile_pspace_info *info;
98 info = program_space_data (pspace, objfiles_pspace_data);
101 info = XZALLOC (struct objfile_pspace_info);
102 set_program_space_data (pspace, objfiles_pspace_data, info);
110 /* Per-BFD data key. */
112 static const struct bfd_data *objfiles_bfd_data;
114 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
115 NULL, and it already has a per-BFD storage object, use that.
116 Otherwise, allocate a new per-BFD storage object. If ABFD is not
117 NULL, the object is allocated on the BFD; otherwise it is allocated
118 on OBJFILE's obstack. Note that it is not safe to call this
119 multiple times for a given OBJFILE -- it can only be called when
120 allocating or re-initializing OBJFILE. */
122 static struct objfile_per_bfd_storage *
123 get_objfile_bfd_data (struct objfile *objfile, struct bfd *abfd)
125 struct objfile_per_bfd_storage *storage = NULL;
128 storage = bfd_data (abfd, objfiles_bfd_data);
134 storage = bfd_zalloc (abfd, sizeof (struct objfile_per_bfd_storage));
135 set_bfd_data (abfd, objfiles_bfd_data, storage);
138 storage = OBSTACK_ZALLOC (&objfile->objfile_obstack,
139 struct objfile_per_bfd_storage);
141 obstack_init (&storage->storage_obstack);
142 storage->filename_cache = bcache_xmalloc (NULL, NULL);
143 storage->macro_cache = bcache_xmalloc (NULL, NULL);
152 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage *storage)
154 bcache_xfree (storage->filename_cache);
155 bcache_xfree (storage->macro_cache);
156 obstack_free (&storage->storage_obstack, 0);
159 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
160 cleanup function to the BFD registry. */
163 objfile_bfd_data_free (struct bfd *unused, void *d)
165 free_objfile_per_bfd_storage (d);
168 /* See objfiles.h. */
171 set_objfile_per_bfd (struct objfile *objfile)
173 objfile->per_bfd = get_objfile_bfd_data (objfile, objfile->obfd);
178 /* Called via bfd_map_over_sections to build up the section table that
179 the objfile references. The objfile contains pointers to the start
180 of the table (objfile->sections) and to the first location after
181 the end of the table (objfile->sections_end). */
184 add_to_objfile_sections (struct bfd *abfd, struct bfd_section *asect,
187 struct objfile *objfile = (struct objfile *) objfilep;
188 struct obj_section section;
191 aflag = bfd_get_section_flags (abfd, asect);
192 if (!(aflag & SEC_ALLOC))
194 if (bfd_section_size (abfd, asect) == 0)
197 section.objfile = objfile;
198 section.the_bfd_section = asect;
199 section.ovly_mapped = 0;
200 obstack_grow (&objfile->objfile_obstack,
201 (char *) §ion, sizeof (section));
202 objfile->sections_end
203 = (struct obj_section *) (((size_t) objfile->sections_end) + 1);
206 /* Builds a section table for OBJFILE.
208 Note that while we are building the table, which goes into the
209 objfile obstack, we hijack the sections_end pointer to instead hold
210 a count of the number of sections. When bfd_map_over_sections
211 returns, this count is used to compute the pointer to the end of
212 the sections table, which then overwrites the count.
214 Also note that the OFFSET and OVLY_MAPPED in each table entry
215 are initialized to zero.
217 Also note that if anything else writes to the objfile obstack while
218 we are building the table, we're pretty much hosed. */
221 build_objfile_section_table (struct objfile *objfile)
223 objfile->sections_end = 0;
224 bfd_map_over_sections (objfile->obfd,
225 add_to_objfile_sections, (void *) objfile);
226 objfile->sections = obstack_finish (&objfile->objfile_obstack);
227 objfile->sections_end = objfile->sections + (size_t) objfile->sections_end;
230 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
231 allocate a new objfile struct, fill it in as best we can, link it
232 into the list of all known objfiles, and return a pointer to the
235 The FLAGS word contains various bits (OBJF_*) that can be taken as
236 requests for specific operations. Other bits like OBJF_SHARED are
237 simply copied through to the new objfile flags member. */
239 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
240 by jv-lang.c, to create an artificial objfile used to hold
241 information about dynamically-loaded Java classes. Unfortunately,
242 that branch of this function doesn't get tested very frequently, so
243 it's prone to breakage. (E.g. at one time the name was set to NULL
244 in that situation, which broke a loop over all names in the dynamic
245 library loader.) If you change this function, please try to leave
246 things in a consistent state even if abfd is NULL. */
249 allocate_objfile (bfd *abfd, int flags)
251 struct objfile *objfile;
253 objfile = (struct objfile *) xzalloc (sizeof (struct objfile));
254 objfile->psymbol_cache = psymbol_bcache_init ();
255 /* We could use obstack_specify_allocation here instead, but
256 gdb_obstack.h specifies the alloc/dealloc functions. */
257 obstack_init (&objfile->objfile_obstack);
258 terminate_minimal_symbol_table (objfile);
260 objfile_alloc_data (objfile);
262 /* Update the per-objfile information that comes from the bfd, ensuring
263 that any data that is reference is saved in the per-objfile data
266 objfile->obfd = abfd;
270 /* Look up the gdbarch associated with the BFD. */
271 objfile->gdbarch = gdbarch_from_bfd (abfd);
273 objfile->name = bfd_get_filename (abfd);
274 objfile->mtime = bfd_get_mtime (abfd);
276 /* Build section table. */
277 build_objfile_section_table (objfile);
281 objfile->name = "<<anonymous objfile>>";
284 objfile->per_bfd = get_objfile_bfd_data (objfile, abfd);
285 objfile->pspace = current_program_space;
287 /* Initialize the section indexes for this objfile, so that we can
288 later detect if they are used w/o being properly assigned to. */
290 objfile->sect_index_text = -1;
291 objfile->sect_index_data = -1;
292 objfile->sect_index_bss = -1;
293 objfile->sect_index_rodata = -1;
295 /* Add this file onto the tail of the linked list of other such files. */
297 objfile->next = NULL;
298 if (object_files == NULL)
299 object_files = objfile;
302 struct objfile *last_one;
304 for (last_one = object_files;
306 last_one = last_one->next);
307 last_one->next = objfile;
310 /* Save passed in flag bits. */
311 objfile->flags |= flags;
313 /* Rebuild section map next time we need it. */
314 get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1;
319 /* Retrieve the gdbarch associated with OBJFILE. */
321 get_objfile_arch (struct objfile *objfile)
323 return objfile->gdbarch;
326 /* If there is a valid and known entry point, function fills *ENTRY_P with it
327 and returns non-zero; otherwise it returns zero. */
330 entry_point_address_query (CORE_ADDR *entry_p)
332 if (symfile_objfile == NULL || !symfile_objfile->ei.entry_point_p)
335 *entry_p = symfile_objfile->ei.entry_point;
340 /* Get current entry point address. Call error if it is not known. */
343 entry_point_address (void)
347 if (!entry_point_address_query (&retval))
348 error (_("Entry point address is not known."));
353 /* Iterator on PARENT and every separate debug objfile of PARENT.
354 The usage pattern is:
355 for (objfile = parent;
357 objfile = objfile_separate_debug_iterate (parent, objfile))
362 objfile_separate_debug_iterate (const struct objfile *parent,
363 const struct objfile *objfile)
367 /* If any, return the first child. */
368 res = objfile->separate_debug_objfile;
372 /* Common case where there is no separate debug objfile. */
373 if (objfile == parent)
376 /* Return the brother if any. Note that we don't iterate on brothers of
378 res = objfile->separate_debug_objfile_link;
382 for (res = objfile->separate_debug_objfile_backlink;
384 res = res->separate_debug_objfile_backlink)
386 gdb_assert (res != NULL);
387 if (res->separate_debug_objfile_link)
388 return res->separate_debug_objfile_link;
393 /* Put one object file before a specified on in the global list.
394 This can be used to make sure an object file is destroyed before
395 another when using ALL_OBJFILES_SAFE to free all objfiles. */
397 put_objfile_before (struct objfile *objfile, struct objfile *before_this)
399 struct objfile **objp;
401 unlink_objfile (objfile);
403 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
405 if (*objp == before_this)
407 objfile->next = *objp;
413 internal_error (__FILE__, __LINE__,
414 _("put_objfile_before: before objfile not in list"));
417 /* Put OBJFILE at the front of the list. */
420 objfile_to_front (struct objfile *objfile)
422 struct objfile **objp;
423 for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
425 if (*objp == objfile)
427 /* Unhook it from where it is. */
428 *objp = objfile->next;
429 /* Put it in the front. */
430 objfile->next = object_files;
431 object_files = objfile;
437 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
440 It is not a bug, or error, to call this function if OBJFILE is not known
441 to be in the current list. This is done in the case of mapped objfiles,
442 for example, just to ensure that the mapped objfile doesn't appear twice
443 in the list. Since the list is threaded, linking in a mapped objfile
444 twice would create a circular list.
446 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
447 unlinking it, just to ensure that we have completely severed any linkages
448 between the OBJFILE and the list. */
451 unlink_objfile (struct objfile *objfile)
453 struct objfile **objpp;
455 for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next))
457 if (*objpp == objfile)
459 *objpp = (*objpp)->next;
460 objfile->next = NULL;
465 internal_error (__FILE__, __LINE__,
466 _("unlink_objfile: objfile already unlinked"));
469 /* Add OBJFILE as a separate debug objfile of PARENT. */
472 add_separate_debug_objfile (struct objfile *objfile, struct objfile *parent)
474 gdb_assert (objfile && parent);
476 /* Must not be already in a list. */
477 gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
478 gdb_assert (objfile->separate_debug_objfile_link == NULL);
480 objfile->separate_debug_objfile_backlink = parent;
481 objfile->separate_debug_objfile_link = parent->separate_debug_objfile;
482 parent->separate_debug_objfile = objfile;
484 /* Put the separate debug object before the normal one, this is so that
485 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
486 put_objfile_before (objfile, parent);
489 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
493 free_objfile_separate_debug (struct objfile *objfile)
495 struct objfile *child;
497 for (child = objfile->separate_debug_objfile; child;)
499 struct objfile *next_child = child->separate_debug_objfile_link;
500 free_objfile (child);
505 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
506 that as much as possible is allocated on the objfile_obstack
507 so that the memory can be efficiently freed.
509 Things which we do NOT free because they are not in malloc'd memory
510 or not in memory specific to the objfile include:
514 FIXME: If the objfile is using reusable symbol information (via mmalloc),
515 then we need to take into account the fact that more than one process
516 may be using the symbol information at the same time (when mmalloc is
517 extended to support cooperative locking). When more than one process
518 is using the mapped symbol info, we need to be more careful about when
519 we free objects in the reusable area. */
522 free_objfile (struct objfile *objfile)
524 /* Free all separate debug objfiles. */
525 free_objfile_separate_debug (objfile);
527 if (objfile->separate_debug_objfile_backlink)
529 /* We freed the separate debug file, make sure the base objfile
530 doesn't reference it. */
531 struct objfile *child;
533 child = objfile->separate_debug_objfile_backlink->separate_debug_objfile;
535 if (child == objfile)
537 /* OBJFILE is the first child. */
538 objfile->separate_debug_objfile_backlink->separate_debug_objfile =
539 objfile->separate_debug_objfile_link;
543 /* Find OBJFILE in the list. */
546 if (child->separate_debug_objfile_link == objfile)
548 child->separate_debug_objfile_link =
549 objfile->separate_debug_objfile_link;
552 child = child->separate_debug_objfile_link;
558 /* Remove any references to this objfile in the global value
560 preserve_values (objfile);
562 /* It still may reference data modules have associated with the objfile and
563 the symbol file data. */
564 forget_cached_source_info_for_objfile (objfile);
566 /* First do any symbol file specific actions required when we are
567 finished with a particular symbol file. Note that if the objfile
568 is using reusable symbol information (via mmalloc) then each of
569 these routines is responsible for doing the correct thing, either
570 freeing things which are valid only during this particular gdb
571 execution, or leaving them to be reused during the next one. */
573 if (objfile->sf != NULL)
575 (*objfile->sf->sym_finish) (objfile);
578 /* Discard any data modules have associated with the objfile. The function
579 still may reference objfile->obfd. */
580 objfile_free_data (objfile);
583 gdb_bfd_unref (objfile->obfd);
585 free_objfile_per_bfd_storage (objfile->per_bfd);
587 /* Remove it from the chain of all objfiles. */
589 unlink_objfile (objfile);
591 if (objfile == symfile_objfile)
592 symfile_objfile = NULL;
594 if (objfile == rt_common_objfile)
595 rt_common_objfile = NULL;
597 /* Before the symbol table code was redone to make it easier to
598 selectively load and remove information particular to a specific
599 linkage unit, gdb used to do these things whenever the monolithic
600 symbol table was blown away. How much still needs to be done
601 is unknown, but we play it safe for now and keep each action until
602 it is shown to be no longer needed. */
604 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
605 for example), so we need to call this here. */
606 clear_pc_function_cache ();
608 /* Clear globals which might have pointed into a removed objfile.
609 FIXME: It's not clear which of these are supposed to persist
610 between expressions and which ought to be reset each time. */
611 expression_context_block = NULL;
612 innermost_block = NULL;
614 /* Check to see if the current_source_symtab belongs to this objfile,
615 and if so, call clear_current_source_symtab_and_line. */
618 struct symtab_and_line cursal = get_current_source_symtab_and_line ();
620 if (cursal.symtab && cursal.symtab->objfile == objfile)
621 clear_current_source_symtab_and_line ();
624 /* The last thing we do is free the objfile struct itself. */
626 if (objfile->global_psymbols.list)
627 xfree (objfile->global_psymbols.list);
628 if (objfile->static_psymbols.list)
629 xfree (objfile->static_psymbols.list);
630 /* Free the obstacks for non-reusable objfiles. */
631 psymbol_bcache_free (objfile->psymbol_cache);
632 if (objfile->demangled_names_hash)
633 htab_delete (objfile->demangled_names_hash);
634 obstack_free (&objfile->objfile_obstack, 0);
636 /* Rebuild section map next time we need it. */
637 get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1;
643 do_free_objfile_cleanup (void *obj)
649 make_cleanup_free_objfile (struct objfile *obj)
651 return make_cleanup (do_free_objfile_cleanup, obj);
654 /* Free all the object files at once and clean up their users. */
657 free_all_objfiles (void)
659 struct objfile *objfile, *temp;
662 /* Any objfile referencewould become stale. */
663 for (so = master_so_list (); so; so = so->next)
664 gdb_assert (so->objfile == NULL);
666 ALL_OBJFILES_SAFE (objfile, temp)
668 free_objfile (objfile);
670 clear_symtab_users (0);
673 /* A helper function for objfile_relocate1 that relocates a single
677 relocate_one_symbol (struct symbol *sym, struct objfile *objfile,
678 struct section_offsets *delta)
680 fixup_symbol_section (sym, objfile);
682 /* The RS6000 code from which this was taken skipped
683 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
684 But I'm leaving out that test, on the theory that
685 they can't possibly pass the tests below. */
686 if ((SYMBOL_CLASS (sym) == LOC_LABEL
687 || SYMBOL_CLASS (sym) == LOC_STATIC)
688 && SYMBOL_SECTION (sym) >= 0)
690 SYMBOL_VALUE_ADDRESS (sym) += ANOFFSET (delta, SYMBOL_SECTION (sym));
694 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
695 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
696 Return non-zero iff any change happened. */
699 objfile_relocate1 (struct objfile *objfile,
700 struct section_offsets *new_offsets)
702 struct obj_section *s;
703 struct section_offsets *delta =
704 ((struct section_offsets *)
705 alloca (SIZEOF_N_SECTION_OFFSETS (objfile->num_sections)));
708 int something_changed = 0;
710 for (i = 0; i < objfile->num_sections; ++i)
713 ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
714 if (ANOFFSET (delta, i) != 0)
715 something_changed = 1;
717 if (!something_changed)
720 /* OK, get all the symtabs. */
724 ALL_OBJFILE_SYMTABS (objfile, s)
727 struct blockvector *bv;
730 /* First the line table. */
734 for (i = 0; i < l->nitems; ++i)
735 l->item[i].pc += ANOFFSET (delta, s->block_line_section);
738 /* Don't relocate a shared blockvector more than once. */
742 bv = BLOCKVECTOR (s);
743 if (BLOCKVECTOR_MAP (bv))
744 addrmap_relocate (BLOCKVECTOR_MAP (bv),
745 ANOFFSET (delta, s->block_line_section));
747 for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
751 struct dict_iterator iter;
753 b = BLOCKVECTOR_BLOCK (bv, i);
754 BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
755 BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
757 /* We only want to iterate over the local symbols, not any
758 symbols in included symtabs. */
759 ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym)
761 relocate_one_symbol (sym, objfile, delta);
767 /* Relocate isolated symbols. */
771 for (iter = objfile->template_symbols; iter; iter = iter->hash_next)
772 relocate_one_symbol (iter, objfile, delta);
775 if (objfile->psymtabs_addrmap)
776 addrmap_relocate (objfile->psymtabs_addrmap,
777 ANOFFSET (delta, SECT_OFF_TEXT (objfile)));
780 objfile->sf->qf->relocate (objfile, new_offsets, delta);
783 struct minimal_symbol *msym;
785 ALL_OBJFILE_MSYMBOLS (objfile, msym)
786 if (SYMBOL_SECTION (msym) >= 0)
787 SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
789 /* Relocating different sections by different amounts may cause the symbols
790 to be out of order. */
791 msymbols_sort (objfile);
793 if (objfile->ei.entry_point_p)
795 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
796 only as a fallback. */
797 struct obj_section *s;
798 s = find_pc_section (objfile->ei.entry_point);
800 objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index);
802 objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile));
808 for (i = 0; i < objfile->num_sections; ++i)
809 (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i);
812 /* Rebuild section map next time we need it. */
813 get_objfile_pspace_data (objfile->pspace)->objfiles_changed_p = 1;
815 /* Update the table in exec_ops, used to read memory. */
816 ALL_OBJFILE_OSECTIONS (objfile, s)
818 int idx = s->the_bfd_section->index;
820 exec_set_section_address (bfd_get_filename (objfile->obfd), idx,
821 obj_section_addr (s));
824 /* Relocating probes. */
825 if (objfile->sf && objfile->sf->sym_probe_fns)
826 objfile->sf->sym_probe_fns->sym_relocate_probe (objfile,
833 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
834 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
836 The number and ordering of sections does differ between the two objfiles.
837 Only their names match. Also the file offsets will differ (objfile being
838 possibly prelinked but separate_debug_objfile is probably not prelinked) but
839 the in-memory absolute address as specified by NEW_OFFSETS must match both
843 objfile_relocate (struct objfile *objfile, 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 == 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->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), objf1->name,
1250 paddress (gdbarch, sect1_addr),
1251 paddress (gdbarch, sect1_endaddr),
1252 bfd_section_name (abfd2, bfds2), objf2->name,
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 int alloc_size, map_size, i;
1278 struct obj_section *s, **map;
1279 struct objfile *objfile;
1281 gdb_assert (get_objfile_pspace_data (pspace)->objfiles_changed_p != 0);
1287 ALL_PSPACE_OBJFILES (pspace, objfile)
1288 ALL_OBJFILE_OSECTIONS (objfile, s)
1289 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1292 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1293 if (alloc_size == 0)
1300 map = xmalloc (alloc_size * sizeof (*map));
1303 ALL_PSPACE_OBJFILES (pspace, objfile)
1304 ALL_OBJFILE_OSECTIONS (objfile, s)
1305 if (insert_section_p (objfile->obfd, s->the_bfd_section))
1308 qsort (map, alloc_size, sizeof (*map), qsort_cmp);
1309 map_size = filter_debuginfo_sections(map, alloc_size);
1310 map_size = filter_overlapping_sections(map, map_size);
1312 if (map_size < alloc_size)
1313 /* Some sections were eliminated. Trim excess space. */
1314 map = xrealloc (map, map_size * sizeof (*map));
1316 gdb_assert (alloc_size == map_size);
1319 *pmap_size = map_size;
1322 /* Bsearch comparison function. */
1325 bsearch_cmp (const void *key, const void *elt)
1327 const CORE_ADDR pc = *(CORE_ADDR *) key;
1328 const struct obj_section *section = *(const struct obj_section **) elt;
1330 if (pc < obj_section_addr (section))
1332 if (pc < obj_section_endaddr (section))
1337 /* Returns a section whose range includes PC or NULL if none found. */
1339 struct obj_section *
1340 find_pc_section (CORE_ADDR pc)
1342 struct objfile_pspace_info *pspace_info;
1343 struct obj_section *s, **sp;
1345 /* Check for mapped overlay section first. */
1346 s = find_pc_mapped_section (pc);
1350 pspace_info = get_objfile_pspace_data (current_program_space);
1351 if (pspace_info->objfiles_changed_p != 0)
1353 update_section_map (current_program_space,
1354 &pspace_info->sections,
1355 &pspace_info->num_sections);
1357 /* Don't need updates to section map until objfiles are added,
1358 removed or relocated. */
1359 pspace_info->objfiles_changed_p = 0;
1362 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1363 bsearch be non-NULL. */
1364 if (pspace_info->sections == NULL)
1366 gdb_assert (pspace_info->num_sections == 0);
1370 sp = (struct obj_section **) bsearch (&pc,
1371 pspace_info->sections,
1372 pspace_info->num_sections,
1373 sizeof (*pspace_info->sections),
1381 /* In SVR4, we recognize a trampoline by it's section name.
1382 That is, if the pc is in a section named ".plt" then we are in
1386 in_plt_section (CORE_ADDR pc, char *name)
1388 struct obj_section *s;
1391 s = find_pc_section (pc);
1394 && s->the_bfd_section->name != NULL
1395 && strcmp (s->the_bfd_section->name, ".plt") == 0);
1400 /* Set objfiles_changed_p so section map will be rebuilt next time it
1401 is used. Called by reread_symbols. */
1404 objfiles_changed (void)
1406 /* Rebuild section map next time we need it. */
1407 get_objfile_pspace_data (current_program_space)->objfiles_changed_p = 1;
1410 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1411 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1412 searching the objfiles in the order they are stored internally,
1413 ignoring CURRENT_OBJFILE.
1415 On most platorms, it should be close enough to doing the best
1416 we can without some knowledge specific to the architecture. */
1419 default_iterate_over_objfiles_in_search_order
1420 (struct gdbarch *gdbarch,
1421 iterate_over_objfiles_in_search_order_cb_ftype *cb,
1422 void *cb_data, struct objfile *current_objfile)
1425 struct objfile *objfile;
1427 ALL_OBJFILES (objfile)
1429 stop = cb (objfile, cb_data);
1435 /* Provide a prototype to silence -Wmissing-prototypes. */
1436 extern initialize_file_ftype _initialize_objfiles;
1439 _initialize_objfiles (void)
1441 objfiles_pspace_data
1442 = register_program_space_data_with_cleanup (NULL,
1443 objfiles_pspace_data_cleanup);
1445 objfiles_bfd_data = register_bfd_data_with_cleanup (NULL,
1446 objfile_bfd_data_free);