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
);
479 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
480 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
481 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
483 objfile
->separate_debug_objfile_backlink
= parent
;
484 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
485 parent
->separate_debug_objfile
= objfile
;
487 /* Put the separate debug object before the normal one, this is so that
488 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
489 put_objfile_before (objfile
, parent
);
492 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
496 free_objfile_separate_debug (struct objfile
*objfile
)
498 struct objfile
*child
;
500 for (child
= objfile
->separate_debug_objfile
; child
;)
502 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
503 free_objfile (child
);
508 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
509 that as much as possible is allocated on the objfile_obstack
510 so that the memory can be efficiently freed.
512 Things which we do NOT free because they are not in malloc'd memory
513 or not in memory specific to the objfile include:
517 FIXME: If the objfile is using reusable symbol information (via mmalloc),
518 then we need to take into account the fact that more than one process
519 may be using the symbol information at the same time (when mmalloc is
520 extended to support cooperative locking). When more than one process
521 is using the mapped symbol info, we need to be more careful about when
522 we free objects in the reusable area. */
525 free_objfile (struct objfile
*objfile
)
527 /* Free all separate debug objfiles. */
528 free_objfile_separate_debug (objfile
);
530 if (objfile
->separate_debug_objfile_backlink
)
532 /* We freed the separate debug file, make sure the base objfile
533 doesn't reference it. */
534 struct objfile
*child
;
536 child
= objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
;
538 if (child
== objfile
)
540 /* OBJFILE is the first child. */
541 objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
=
542 objfile
->separate_debug_objfile_link
;
546 /* Find OBJFILE in the list. */
549 if (child
->separate_debug_objfile_link
== objfile
)
551 child
->separate_debug_objfile_link
=
552 objfile
->separate_debug_objfile_link
;
555 child
= child
->separate_debug_objfile_link
;
561 /* Remove any references to this objfile in the global value
563 preserve_values (objfile
);
565 /* It still may reference data modules have associated with the objfile and
566 the symbol file data. */
567 forget_cached_source_info_for_objfile (objfile
);
569 /* First do any symbol file specific actions required when we are
570 finished with a particular symbol file. Note that if the objfile
571 is using reusable symbol information (via mmalloc) then each of
572 these routines is responsible for doing the correct thing, either
573 freeing things which are valid only during this particular gdb
574 execution, or leaving them to be reused during the next one. */
576 if (objfile
->sf
!= NULL
)
578 (*objfile
->sf
->sym_finish
) (objfile
);
581 /* Discard any data modules have associated with the objfile. The function
582 still may reference objfile->obfd. */
583 objfile_free_data (objfile
);
586 gdb_bfd_unref (objfile
->obfd
);
588 free_objfile_per_bfd_storage (objfile
->per_bfd
);
590 /* Remove it from the chain of all objfiles. */
592 unlink_objfile (objfile
);
594 if (objfile
== symfile_objfile
)
595 symfile_objfile
= NULL
;
597 if (objfile
== rt_common_objfile
)
598 rt_common_objfile
= NULL
;
600 /* Before the symbol table code was redone to make it easier to
601 selectively load and remove information particular to a specific
602 linkage unit, gdb used to do these things whenever the monolithic
603 symbol table was blown away. How much still needs to be done
604 is unknown, but we play it safe for now and keep each action until
605 it is shown to be no longer needed. */
607 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
608 for example), so we need to call this here. */
609 clear_pc_function_cache ();
611 /* Clear globals which might have pointed into a removed objfile.
612 FIXME: It's not clear which of these are supposed to persist
613 between expressions and which ought to be reset each time. */
614 expression_context_block
= NULL
;
615 innermost_block
= NULL
;
617 /* Check to see if the current_source_symtab belongs to this objfile,
618 and if so, call clear_current_source_symtab_and_line. */
621 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
623 if (cursal
.symtab
&& cursal
.symtab
->objfile
== objfile
)
624 clear_current_source_symtab_and_line ();
627 /* The last thing we do is free the objfile struct itself. */
629 if (objfile
->global_psymbols
.list
)
630 xfree (objfile
->global_psymbols
.list
);
631 if (objfile
->static_psymbols
.list
)
632 xfree (objfile
->static_psymbols
.list
);
633 /* Free the obstacks for non-reusable objfiles. */
634 psymbol_bcache_free (objfile
->psymbol_cache
);
635 if (objfile
->demangled_names_hash
)
636 htab_delete (objfile
->demangled_names_hash
);
637 obstack_free (&objfile
->objfile_obstack
, 0);
639 /* Rebuild section map next time we need it. */
640 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
646 do_free_objfile_cleanup (void *obj
)
652 make_cleanup_free_objfile (struct objfile
*obj
)
654 return make_cleanup (do_free_objfile_cleanup
, obj
);
657 /* Free all the object files at once and clean up their users. */
660 free_all_objfiles (void)
662 struct objfile
*objfile
, *temp
;
665 /* Any objfile referencewould become stale. */
666 for (so
= master_so_list (); so
; so
= so
->next
)
667 gdb_assert (so
->objfile
== NULL
);
669 ALL_OBJFILES_SAFE (objfile
, temp
)
671 free_objfile (objfile
);
673 clear_symtab_users (0);
676 /* A helper function for objfile_relocate1 that relocates a single
680 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
681 struct section_offsets
*delta
)
683 fixup_symbol_section (sym
, objfile
);
685 /* The RS6000 code from which this was taken skipped
686 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
687 But I'm leaving out that test, on the theory that
688 they can't possibly pass the tests below. */
689 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
690 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
691 && SYMBOL_SECTION (sym
) >= 0)
693 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
697 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
698 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
699 Return non-zero iff any change happened. */
702 objfile_relocate1 (struct objfile
*objfile
,
703 struct section_offsets
*new_offsets
)
705 struct obj_section
*s
;
706 struct section_offsets
*delta
=
707 ((struct section_offsets
*)
708 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
711 int something_changed
= 0;
713 for (i
= 0; i
< objfile
->num_sections
; ++i
)
716 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
717 if (ANOFFSET (delta
, i
) != 0)
718 something_changed
= 1;
720 if (!something_changed
)
723 /* OK, get all the symtabs. */
727 ALL_OBJFILE_SYMTABS (objfile
, s
)
730 struct blockvector
*bv
;
733 /* First the line table. */
737 for (i
= 0; i
< l
->nitems
; ++i
)
738 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
741 /* Don't relocate a shared blockvector more than once. */
745 bv
= BLOCKVECTOR (s
);
746 if (BLOCKVECTOR_MAP (bv
))
747 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
748 ANOFFSET (delta
, s
->block_line_section
));
750 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
754 struct dict_iterator iter
;
756 b
= BLOCKVECTOR_BLOCK (bv
, i
);
757 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
758 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
760 /* We only want to iterate over the local symbols, not any
761 symbols in included symtabs. */
762 ALL_DICT_SYMBOLS (BLOCK_DICT (b
), iter
, sym
)
764 relocate_one_symbol (sym
, objfile
, delta
);
770 /* Relocate isolated symbols. */
774 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
775 relocate_one_symbol (iter
, objfile
, delta
);
778 if (objfile
->psymtabs_addrmap
)
779 addrmap_relocate (objfile
->psymtabs_addrmap
,
780 ANOFFSET (delta
, SECT_OFF_TEXT (objfile
)));
783 objfile
->sf
->qf
->relocate (objfile
, new_offsets
, delta
);
786 struct minimal_symbol
*msym
;
788 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
789 if (SYMBOL_SECTION (msym
) >= 0)
790 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
792 /* Relocating different sections by different amounts may cause the symbols
793 to be out of order. */
794 msymbols_sort (objfile
);
796 if (objfile
->ei
.entry_point_p
)
798 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
799 only as a fallback. */
800 struct obj_section
*s
;
801 s
= find_pc_section (objfile
->ei
.entry_point
);
803 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
805 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
811 for (i
= 0; i
< objfile
->num_sections
; ++i
)
812 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
815 /* Rebuild section map next time we need it. */
816 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
818 /* Update the table in exec_ops, used to read memory. */
819 ALL_OBJFILE_OSECTIONS (objfile
, s
)
821 int idx
= s
->the_bfd_section
->index
;
823 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
824 obj_section_addr (s
));
827 /* Relocating probes. */
828 if (objfile
->sf
&& objfile
->sf
->sym_probe_fns
)
829 objfile
->sf
->sym_probe_fns
->sym_relocate_probe (objfile
,
836 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
837 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
839 The number and ordering of sections does differ between the two objfiles.
840 Only their names match. Also the file offsets will differ (objfile being
841 possibly prelinked but separate_debug_objfile is probably not prelinked) but
842 the in-memory absolute address as specified by NEW_OFFSETS must match both
846 objfile_relocate (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
848 struct objfile
*debug_objfile
;
851 changed
|= objfile_relocate1 (objfile
, new_offsets
);
853 for (debug_objfile
= objfile
->separate_debug_objfile
;
855 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
857 struct section_addr_info
*objfile_addrs
;
858 struct section_offsets
*new_debug_offsets
;
859 struct cleanup
*my_cleanups
;
861 objfile_addrs
= build_section_addr_info_from_objfile (objfile
);
862 my_cleanups
= make_cleanup (xfree
, objfile_addrs
);
864 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
865 relative ones must be already created according to debug_objfile. */
867 addr_info_make_relative (objfile_addrs
, debug_objfile
->obfd
);
869 gdb_assert (debug_objfile
->num_sections
870 == bfd_count_sections (debug_objfile
->obfd
));
872 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
873 make_cleanup (xfree
, new_debug_offsets
);
874 relative_addr_info_to_section_offsets (new_debug_offsets
,
875 debug_objfile
->num_sections
,
878 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
);
880 do_cleanups (my_cleanups
);
883 /* Relocate breakpoints as necessary, after things are relocated. */
885 breakpoint_re_set ();
888 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
890 Return non-zero iff any change happened. */
893 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
895 struct section_offsets
*new_offsets
=
896 ((struct section_offsets
*)
897 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
900 for (i
= 0; i
< objfile
->num_sections
; ++i
)
901 new_offsets
->offsets
[i
] = slide
;
903 return objfile_relocate1 (objfile
, new_offsets
);
906 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
907 SEPARATE_DEBUG_OBJFILEs. */
910 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
912 struct objfile
*debug_objfile
;
915 changed
|= objfile_rebase1 (objfile
, slide
);
917 for (debug_objfile
= objfile
->separate_debug_objfile
;
919 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
920 changed
|= objfile_rebase1 (debug_objfile
, slide
);
922 /* Relocate breakpoints as necessary, after things are relocated. */
924 breakpoint_re_set ();
927 /* Return non-zero if OBJFILE has partial symbols. */
930 objfile_has_partial_symbols (struct objfile
*objfile
)
935 /* If we have not read psymbols, but we have a function capable of reading
936 them, then that is an indication that they are in fact available. Without
937 this function the symbols may have been already read in but they also may
938 not be present in this objfile. */
939 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
940 && objfile
->sf
->sym_read_psymbols
!= NULL
)
943 return objfile
->sf
->qf
->has_symbols (objfile
);
946 /* Return non-zero if OBJFILE has full symbols. */
949 objfile_has_full_symbols (struct objfile
*objfile
)
951 return objfile
->symtabs
!= NULL
;
954 /* Return non-zero if OBJFILE has full or partial symbols, either directly
955 or through a separate debug file. */
958 objfile_has_symbols (struct objfile
*objfile
)
962 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
963 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
969 /* Many places in gdb want to test just to see if we have any partial
970 symbols available. This function returns zero if none are currently
971 available, nonzero otherwise. */
974 have_partial_symbols (void)
980 if (objfile_has_partial_symbols (ofp
))
986 /* Many places in gdb want to test just to see if we have any full
987 symbols available. This function returns zero if none are currently
988 available, nonzero otherwise. */
991 have_full_symbols (void)
997 if (objfile_has_full_symbols (ofp
))
1004 /* This operations deletes all objfile entries that represent solibs that
1005 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1009 objfile_purge_solibs (void)
1011 struct objfile
*objf
;
1012 struct objfile
*temp
;
1014 ALL_OBJFILES_SAFE (objf
, temp
)
1016 /* We assume that the solib package has been purged already, or will
1019 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1020 free_objfile (objf
);
1025 /* Many places in gdb want to test just to see if we have any minimal
1026 symbols available. This function returns zero if none are currently
1027 available, nonzero otherwise. */
1030 have_minimal_symbols (void)
1032 struct objfile
*ofp
;
1036 if (ofp
->minimal_symbol_count
> 0)
1044 /* Qsort comparison function. */
1047 qsort_cmp (const void *a
, const void *b
)
1049 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1050 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1051 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1052 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1054 if (sect1_addr
< sect2_addr
)
1056 else if (sect1_addr
> sect2_addr
)
1060 /* Sections are at the same address. This could happen if
1061 A) we have an objfile and a separate debuginfo.
1062 B) we are confused, and have added sections without proper relocation,
1063 or something like that. */
1065 const struct objfile
*const objfile1
= sect1
->objfile
;
1066 const struct objfile
*const objfile2
= sect2
->objfile
;
1068 if (objfile1
->separate_debug_objfile
== objfile2
1069 || objfile2
->separate_debug_objfile
== objfile1
)
1071 /* Case A. The ordering doesn't matter: separate debuginfo files
1072 will be filtered out later. */
1077 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1078 triage. This section could be slow (since we iterate over all
1079 objfiles in each call to qsort_cmp), but this shouldn't happen
1080 very often (GDB is already in a confused state; one hopes this
1081 doesn't happen at all). If you discover that significant time is
1082 spent in the loops below, do 'set complaints 100' and examine the
1083 resulting complaints. */
1085 if (objfile1
== objfile2
)
1087 /* Both sections came from the same objfile. We are really confused.
1088 Sort on sequence order of sections within the objfile. */
1090 const struct obj_section
*osect
;
1092 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1095 else if (osect
== sect2
)
1098 /* We should have found one of the sections before getting here. */
1099 gdb_assert_not_reached ("section not found");
1103 /* Sort on sequence number of the objfile in the chain. */
1105 const struct objfile
*objfile
;
1107 ALL_OBJFILES (objfile
)
1108 if (objfile
== objfile1
)
1110 else if (objfile
== objfile2
)
1113 /* We should have found one of the objfiles before getting here. */
1114 gdb_assert_not_reached ("objfile not found");
1119 gdb_assert_not_reached ("unexpected code path");
1123 /* Select "better" obj_section to keep. We prefer the one that came from
1124 the real object, rather than the one from separate debuginfo.
1125 Most of the time the two sections are exactly identical, but with
1126 prelinking the .rel.dyn section in the real object may have different
1129 static struct obj_section
*
1130 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1132 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1133 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1134 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1135 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1136 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1138 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1143 /* Return 1 if SECTION should be inserted into the section map.
1144 We want to insert only non-overlay and non-TLS section. */
1147 insert_section_p (const struct bfd
*abfd
,
1148 const struct bfd_section
*section
)
1150 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1152 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1153 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1154 /* This is an overlay section. IN_MEMORY check is needed to avoid
1155 discarding sections from the "system supplied DSO" (aka vdso)
1156 on some Linux systems (e.g. Fedora 11). */
1158 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1159 /* This is a TLS section. */
1165 /* Filter out overlapping sections where one section came from the real
1166 objfile, and the other from a separate debuginfo file.
1167 Return the size of table after redundant sections have been eliminated. */
1170 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1174 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1176 struct obj_section
*const sect1
= map
[i
];
1177 struct obj_section
*const sect2
= map
[i
+ 1];
1178 const struct objfile
*const objfile1
= sect1
->objfile
;
1179 const struct objfile
*const objfile2
= sect2
->objfile
;
1180 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1181 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1183 if (sect1_addr
== sect2_addr
1184 && (objfile1
->separate_debug_objfile
== objfile2
1185 || objfile2
->separate_debug_objfile
== objfile1
))
1187 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1196 gdb_assert (i
== map_size
- 1);
1200 /* The map should not have shrunk to less than half the original size. */
1201 gdb_assert (map_size
/ 2 <= j
);
1206 /* Filter out overlapping sections, issuing a warning if any are found.
1207 Overlapping sections could really be overlay sections which we didn't
1208 classify as such in insert_section_p, or we could be dealing with a
1212 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1216 for (i
= 0, j
= 0; i
< map_size
- 1; )
1221 for (k
= i
+ 1; k
< map_size
; k
++)
1223 struct obj_section
*const sect1
= map
[i
];
1224 struct obj_section
*const sect2
= map
[k
];
1225 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1226 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1227 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1229 gdb_assert (sect1_addr
<= sect2_addr
);
1231 if (sect1_endaddr
<= sect2_addr
)
1235 /* We have an overlap. Report it. */
1237 struct objfile
*const objf1
= sect1
->objfile
;
1238 struct objfile
*const objf2
= sect2
->objfile
;
1240 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1241 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1243 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1245 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1247 complaint (&symfile_complaints
,
1248 _("unexpected overlap between:\n"
1249 " (A) section `%s' from `%s' [%s, %s)\n"
1250 " (B) section `%s' from `%s' [%s, %s).\n"
1251 "Will ignore section B"),
1252 bfd_section_name (abfd1
, bfds1
), objf1
->name
,
1253 paddress (gdbarch
, sect1_addr
),
1254 paddress (gdbarch
, sect1_endaddr
),
1255 bfd_section_name (abfd2
, bfds2
), objf2
->name
,
1256 paddress (gdbarch
, sect2_addr
),
1257 paddress (gdbarch
, sect2_endaddr
));
1265 gdb_assert (i
== map_size
- 1);
1273 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1274 TLS, overlay and overlapping sections. */
1277 update_section_map (struct program_space
*pspace
,
1278 struct obj_section
***pmap
, int *pmap_size
)
1280 int alloc_size
, map_size
, i
;
1281 struct obj_section
*s
, **map
;
1282 struct objfile
*objfile
;
1284 gdb_assert (get_objfile_pspace_data (pspace
)->objfiles_changed_p
!= 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
->objfiles_changed_p
!= 0)
1356 update_section_map (current_program_space
,
1357 &pspace_info
->sections
,
1358 &pspace_info
->num_sections
);
1360 /* Don't need updates to section map until objfiles are added,
1361 removed or relocated. */
1362 pspace_info
->objfiles_changed_p
= 0;
1365 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1366 bsearch be non-NULL. */
1367 if (pspace_info
->sections
== NULL
)
1369 gdb_assert (pspace_info
->num_sections
== 0);
1373 sp
= (struct obj_section
**) bsearch (&pc
,
1374 pspace_info
->sections
,
1375 pspace_info
->num_sections
,
1376 sizeof (*pspace_info
->sections
),
1384 /* In SVR4, we recognize a trampoline by it's section name.
1385 That is, if the pc is in a section named ".plt" then we are in
1389 in_plt_section (CORE_ADDR pc
, char *name
)
1391 struct obj_section
*s
;
1394 s
= find_pc_section (pc
);
1397 && s
->the_bfd_section
->name
!= NULL
1398 && strcmp (s
->the_bfd_section
->name
, ".plt") == 0);
1403 /* Set objfiles_changed_p so section map will be rebuilt next time it
1404 is used. Called by reread_symbols. */
1407 objfiles_changed (void)
1409 /* Rebuild section map next time we need it. */
1410 get_objfile_pspace_data (current_program_space
)->objfiles_changed_p
= 1;
1413 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1414 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1415 searching the objfiles in the order they are stored internally,
1416 ignoring CURRENT_OBJFILE.
1418 On most platorms, it should be close enough to doing the best
1419 we can without some knowledge specific to the architecture. */
1422 default_iterate_over_objfiles_in_search_order
1423 (struct gdbarch
*gdbarch
,
1424 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1425 void *cb_data
, struct objfile
*current_objfile
)
1428 struct objfile
*objfile
;
1430 ALL_OBJFILES (objfile
)
1432 stop
= cb (objfile
, cb_data
);
1438 /* Provide a prototype to silence -Wmissing-prototypes. */
1439 extern initialize_file_ftype _initialize_objfiles
;
1442 _initialize_objfiles (void)
1444 objfiles_pspace_data
1445 = register_program_space_data_with_cleanup (NULL
,
1446 objfiles_pspace_data_cleanup
);
1448 objfiles_bfd_data
= register_bfd_data_with_cleanup (NULL
,
1449 objfile_bfd_data_free
);