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"
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
;
90 info
= program_space_data (pspace
, objfiles_pspace_data
);
93 xfree (info
->sections
);
98 /* Get the current svr4 data. If none is found yet, add it now. This
99 function always returns a valid object. */
101 static struct objfile_pspace_info
*
102 get_objfile_pspace_data (struct program_space
*pspace
)
104 struct objfile_pspace_info
*info
;
106 info
= program_space_data (pspace
, objfiles_pspace_data
);
109 info
= XZALLOC (struct objfile_pspace_info
);
110 set_program_space_data (pspace
, objfiles_pspace_data
, info
);
118 /* Per-BFD data key. */
120 static const struct bfd_data
*objfiles_bfd_data
;
122 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
123 NULL, and it already has a per-BFD storage object, use that.
124 Otherwise, allocate a new per-BFD storage object. If ABFD is not
125 NULL, the object is allocated on the BFD; otherwise it is allocated
126 on OBJFILE's obstack. Note that it is not safe to call this
127 multiple times for a given OBJFILE -- it can only be called when
128 allocating or re-initializing OBJFILE. */
130 static struct objfile_per_bfd_storage
*
131 get_objfile_bfd_data (struct objfile
*objfile
, struct bfd
*abfd
)
133 struct objfile_per_bfd_storage
*storage
= NULL
;
136 storage
= bfd_data (abfd
, objfiles_bfd_data
);
140 /* If the object requires gdb to do relocations, we simply fall
141 back to not sharing data across users. These cases are rare
142 enough that this seems reasonable. */
143 if (abfd
!= NULL
&& !gdb_bfd_requires_relocations (abfd
))
145 storage
= bfd_zalloc (abfd
, sizeof (struct objfile_per_bfd_storage
));
146 set_bfd_data (abfd
, objfiles_bfd_data
, storage
);
149 storage
= OBSTACK_ZALLOC (&objfile
->objfile_obstack
,
150 struct objfile_per_bfd_storage
);
152 /* Look up the gdbarch associated with the BFD. */
154 storage
->gdbarch
= gdbarch_from_bfd (abfd
);
156 obstack_init (&storage
->storage_obstack
);
157 storage
->filename_cache
= bcache_xmalloc (NULL
, NULL
);
158 storage
->macro_cache
= bcache_xmalloc (NULL
, NULL
);
167 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage
*storage
)
169 bcache_xfree (storage
->filename_cache
);
170 bcache_xfree (storage
->macro_cache
);
171 obstack_free (&storage
->storage_obstack
, 0);
174 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
175 cleanup function to the BFD registry. */
178 objfile_bfd_data_free (struct bfd
*unused
, void *d
)
180 free_objfile_per_bfd_storage (d
);
183 /* See objfiles.h. */
186 set_objfile_per_bfd (struct objfile
*objfile
)
188 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, objfile
->obfd
);
193 /* Called via bfd_map_over_sections to build up the section table that
194 the objfile references. The objfile contains pointers to the start
195 of the table (objfile->sections) and to the first location after
196 the end of the table (objfile->sections_end). */
199 add_to_objfile_sections_full (struct bfd
*abfd
, struct bfd_section
*asect
,
200 struct objfile
*objfile
, int force
)
202 struct obj_section
*section
;
208 aflag
= bfd_get_section_flags (abfd
, asect
);
209 if (!(aflag
& SEC_ALLOC
))
213 section
= &objfile
->sections
[gdb_bfd_section_index (abfd
, asect
)];
214 section
->objfile
= objfile
;
215 section
->the_bfd_section
= asect
;
216 section
->ovly_mapped
= 0;
220 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
223 add_to_objfile_sections_full (abfd
, asect
, objfilep
, 0);
226 /* Builds a section table for OBJFILE.
228 Note that the OFFSET and OVLY_MAPPED in each table entry are
229 initialized to zero. */
232 build_objfile_section_table (struct objfile
*objfile
)
234 int count
= gdb_bfd_count_sections (objfile
->obfd
);
236 objfile
->sections
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
239 objfile
->sections_end
= (objfile
->sections
+ count
);
240 bfd_map_over_sections (objfile
->obfd
,
241 add_to_objfile_sections
, (void *) objfile
);
243 /* See gdb_bfd_section_index. */
244 add_to_objfile_sections_full (objfile
->obfd
, bfd_com_section_ptr
, objfile
, 1);
245 add_to_objfile_sections_full (objfile
->obfd
, bfd_und_section_ptr
, objfile
, 1);
246 add_to_objfile_sections_full (objfile
->obfd
, bfd_abs_section_ptr
, objfile
, 1);
247 add_to_objfile_sections_full (objfile
->obfd
, bfd_ind_section_ptr
, objfile
, 1);
250 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
251 allocate a new objfile struct, fill it in as best we can, link it
252 into the list of all known objfiles, and return a pointer to the
255 NAME should contain original non-canonicalized filename or other
256 identifier as entered by user. If there is no better source use
257 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
258 NAME content is copied into returned objfile.
260 The FLAGS word contains various bits (OBJF_*) that can be taken as
261 requests for specific operations. Other bits like OBJF_SHARED are
262 simply copied through to the new objfile flags member. */
264 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
265 by jv-lang.c, to create an artificial objfile used to hold
266 information about dynamically-loaded Java classes. Unfortunately,
267 that branch of this function doesn't get tested very frequently, so
268 it's prone to breakage. (E.g. at one time the name was set to NULL
269 in that situation, which broke a loop over all names in the dynamic
270 library loader.) If you change this function, please try to leave
271 things in a consistent state even if abfd is NULL. */
274 allocate_objfile (bfd
*abfd
, const char *name
, int flags
)
276 struct objfile
*objfile
;
278 objfile
= (struct objfile
*) xzalloc (sizeof (struct objfile
));
279 objfile
->psymbol_cache
= psymbol_bcache_init ();
280 /* We could use obstack_specify_allocation here instead, but
281 gdb_obstack.h specifies the alloc/dealloc functions. */
282 obstack_init (&objfile
->objfile_obstack
);
283 terminate_minimal_symbol_table (objfile
);
285 objfile_alloc_data (objfile
);
289 gdb_assert (abfd
== NULL
);
290 name
= "<<anonymous objfile>>";
292 objfile
->original_name
= obstack_copy0 (&objfile
->objfile_obstack
, name
,
295 /* Update the per-objfile information that comes from the bfd, ensuring
296 that any data that is reference is saved in the per-objfile data
299 objfile
->obfd
= abfd
;
303 objfile
->mtime
= bfd_get_mtime (abfd
);
305 /* Build section table. */
306 build_objfile_section_table (objfile
);
309 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, abfd
);
310 objfile
->pspace
= current_program_space
;
312 /* Initialize the section indexes for this objfile, so that we can
313 later detect if they are used w/o being properly assigned to. */
315 objfile
->sect_index_text
= -1;
316 objfile
->sect_index_data
= -1;
317 objfile
->sect_index_bss
= -1;
318 objfile
->sect_index_rodata
= -1;
320 /* Add this file onto the tail of the linked list of other such files. */
322 objfile
->next
= NULL
;
323 if (object_files
== NULL
)
324 object_files
= objfile
;
327 struct objfile
*last_one
;
329 for (last_one
= object_files
;
331 last_one
= last_one
->next
);
332 last_one
->next
= objfile
;
335 /* Save passed in flag bits. */
336 objfile
->flags
|= flags
;
338 /* Rebuild section map next time we need it. */
339 get_objfile_pspace_data (objfile
->pspace
)->new_objfiles_available
= 1;
344 /* Retrieve the gdbarch associated with OBJFILE. */
346 get_objfile_arch (struct objfile
*objfile
)
348 return objfile
->per_bfd
->gdbarch
;
351 /* If there is a valid and known entry point, function fills *ENTRY_P with it
352 and returns non-zero; otherwise it returns zero. */
355 entry_point_address_query (CORE_ADDR
*entry_p
)
357 if (symfile_objfile
== NULL
|| !symfile_objfile
->ei
.entry_point_p
)
360 *entry_p
= symfile_objfile
->ei
.entry_point
;
365 /* Get current entry point address. Call error if it is not known. */
368 entry_point_address (void)
372 if (!entry_point_address_query (&retval
))
373 error (_("Entry point address is not known."));
378 /* Iterator on PARENT and every separate debug objfile of PARENT.
379 The usage pattern is:
380 for (objfile = parent;
382 objfile = objfile_separate_debug_iterate (parent, objfile))
387 objfile_separate_debug_iterate (const struct objfile
*parent
,
388 const struct objfile
*objfile
)
392 /* If any, return the first child. */
393 res
= objfile
->separate_debug_objfile
;
397 /* Common case where there is no separate debug objfile. */
398 if (objfile
== parent
)
401 /* Return the brother if any. Note that we don't iterate on brothers of
403 res
= objfile
->separate_debug_objfile_link
;
407 for (res
= objfile
->separate_debug_objfile_backlink
;
409 res
= res
->separate_debug_objfile_backlink
)
411 gdb_assert (res
!= NULL
);
412 if (res
->separate_debug_objfile_link
)
413 return res
->separate_debug_objfile_link
;
418 /* Put one object file before a specified on in the global list.
419 This can be used to make sure an object file is destroyed before
420 another when using ALL_OBJFILES_SAFE to free all objfiles. */
422 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
424 struct objfile
**objp
;
426 unlink_objfile (objfile
);
428 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
430 if (*objp
== before_this
)
432 objfile
->next
= *objp
;
438 internal_error (__FILE__
, __LINE__
,
439 _("put_objfile_before: before objfile not in list"));
442 /* Put OBJFILE at the front of the list. */
445 objfile_to_front (struct objfile
*objfile
)
447 struct objfile
**objp
;
448 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
450 if (*objp
== objfile
)
452 /* Unhook it from where it is. */
453 *objp
= objfile
->next
;
454 /* Put it in the front. */
455 objfile
->next
= object_files
;
456 object_files
= objfile
;
462 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
465 It is not a bug, or error, to call this function if OBJFILE is not known
466 to be in the current list. This is done in the case of mapped objfiles,
467 for example, just to ensure that the mapped objfile doesn't appear twice
468 in the list. Since the list is threaded, linking in a mapped objfile
469 twice would create a circular list.
471 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
472 unlinking it, just to ensure that we have completely severed any linkages
473 between the OBJFILE and the list. */
476 unlink_objfile (struct objfile
*objfile
)
478 struct objfile
**objpp
;
480 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
482 if (*objpp
== objfile
)
484 *objpp
= (*objpp
)->next
;
485 objfile
->next
= NULL
;
490 internal_error (__FILE__
, __LINE__
,
491 _("unlink_objfile: objfile already unlinked"));
494 /* Add OBJFILE as a separate debug objfile of PARENT. */
497 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
499 gdb_assert (objfile
&& parent
);
501 /* Must not be already in a list. */
502 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
503 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
504 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
505 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
506 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
508 objfile
->separate_debug_objfile_backlink
= parent
;
509 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
510 parent
->separate_debug_objfile
= objfile
;
512 /* Put the separate debug object before the normal one, this is so that
513 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
514 put_objfile_before (objfile
, parent
);
517 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
521 free_objfile_separate_debug (struct objfile
*objfile
)
523 struct objfile
*child
;
525 for (child
= objfile
->separate_debug_objfile
; child
;)
527 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
528 free_objfile (child
);
533 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
534 that as much as possible is allocated on the objfile_obstack
535 so that the memory can be efficiently freed.
537 Things which we do NOT free because they are not in malloc'd memory
538 or not in memory specific to the objfile include:
542 FIXME: If the objfile is using reusable symbol information (via mmalloc),
543 then we need to take into account the fact that more than one process
544 may be using the symbol information at the same time (when mmalloc is
545 extended to support cooperative locking). When more than one process
546 is using the mapped symbol info, we need to be more careful about when
547 we free objects in the reusable area. */
550 free_objfile (struct objfile
*objfile
)
552 /* Free all separate debug objfiles. */
553 free_objfile_separate_debug (objfile
);
555 if (objfile
->separate_debug_objfile_backlink
)
557 /* We freed the separate debug file, make sure the base objfile
558 doesn't reference it. */
559 struct objfile
*child
;
561 child
= objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
;
563 if (child
== objfile
)
565 /* OBJFILE is the first child. */
566 objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
=
567 objfile
->separate_debug_objfile_link
;
571 /* Find OBJFILE in the list. */
574 if (child
->separate_debug_objfile_link
== objfile
)
576 child
->separate_debug_objfile_link
=
577 objfile
->separate_debug_objfile_link
;
580 child
= child
->separate_debug_objfile_link
;
586 /* Remove any references to this objfile in the global value
588 preserve_values (objfile
);
590 /* It still may reference data modules have associated with the objfile and
591 the symbol file data. */
592 forget_cached_source_info_for_objfile (objfile
);
594 breakpoint_free_objfile (objfile
);
595 btrace_free_objfile (objfile
);
597 /* First do any symbol file specific actions required when we are
598 finished with a particular symbol file. Note that if the objfile
599 is using reusable symbol information (via mmalloc) then each of
600 these routines is responsible for doing the correct thing, either
601 freeing things which are valid only during this particular gdb
602 execution, or leaving them to be reused during the next one. */
604 if (objfile
->sf
!= NULL
)
606 (*objfile
->sf
->sym_finish
) (objfile
);
609 /* Discard any data modules have associated with the objfile. The function
610 still may reference objfile->obfd. */
611 objfile_free_data (objfile
);
614 gdb_bfd_unref (objfile
->obfd
);
616 free_objfile_per_bfd_storage (objfile
->per_bfd
);
618 /* Remove it from the chain of all objfiles. */
620 unlink_objfile (objfile
);
622 if (objfile
== symfile_objfile
)
623 symfile_objfile
= NULL
;
625 /* Before the symbol table code was redone to make it easier to
626 selectively load and remove information particular to a specific
627 linkage unit, gdb used to do these things whenever the monolithic
628 symbol table was blown away. How much still needs to be done
629 is unknown, but we play it safe for now and keep each action until
630 it is shown to be no longer needed. */
632 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
633 for example), so we need to call this here. */
634 clear_pc_function_cache ();
636 /* Clear globals which might have pointed into a removed objfile.
637 FIXME: It's not clear which of these are supposed to persist
638 between expressions and which ought to be reset each time. */
639 expression_context_block
= NULL
;
640 innermost_block
= NULL
;
642 /* Check to see if the current_source_symtab belongs to this objfile,
643 and if so, call clear_current_source_symtab_and_line. */
646 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
648 if (cursal
.symtab
&& cursal
.symtab
->objfile
== objfile
)
649 clear_current_source_symtab_and_line ();
652 if (objfile
->global_psymbols
.list
)
653 xfree (objfile
->global_psymbols
.list
);
654 if (objfile
->static_psymbols
.list
)
655 xfree (objfile
->static_psymbols
.list
);
656 /* Free the obstacks for non-reusable objfiles. */
657 psymbol_bcache_free (objfile
->psymbol_cache
);
658 if (objfile
->demangled_names_hash
)
659 htab_delete (objfile
->demangled_names_hash
);
660 obstack_free (&objfile
->objfile_obstack
, 0);
662 /* Rebuild section map next time we need it. */
663 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
665 /* The last thing we do is free the objfile struct itself. */
670 do_free_objfile_cleanup (void *obj
)
676 make_cleanup_free_objfile (struct objfile
*obj
)
678 return make_cleanup (do_free_objfile_cleanup
, obj
);
681 /* Free all the object files at once and clean up their users. */
684 free_all_objfiles (void)
686 struct objfile
*objfile
, *temp
;
689 /* Any objfile referencewould become stale. */
690 for (so
= master_so_list (); so
; so
= so
->next
)
691 gdb_assert (so
->objfile
== NULL
);
693 ALL_OBJFILES_SAFE (objfile
, temp
)
695 free_objfile (objfile
);
697 clear_symtab_users (0);
700 /* A helper function for objfile_relocate1 that relocates a single
704 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
705 struct section_offsets
*delta
)
707 fixup_symbol_section (sym
, objfile
);
709 /* The RS6000 code from which this was taken skipped
710 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
711 But I'm leaving out that test, on the theory that
712 they can't possibly pass the tests below. */
713 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
714 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
715 && SYMBOL_SECTION (sym
) >= 0)
717 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
721 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
722 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
723 Return non-zero iff any change happened. */
726 objfile_relocate1 (struct objfile
*objfile
,
727 const struct section_offsets
*new_offsets
)
729 struct obj_section
*s
;
730 struct section_offsets
*delta
=
731 ((struct section_offsets
*)
732 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
735 int something_changed
= 0;
737 for (i
= 0; i
< objfile
->num_sections
; ++i
)
740 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
741 if (ANOFFSET (delta
, i
) != 0)
742 something_changed
= 1;
744 if (!something_changed
)
747 /* OK, get all the symtabs. */
751 ALL_OBJFILE_SYMTABS (objfile
, s
)
754 struct blockvector
*bv
;
757 /* First the line table. */
761 for (i
= 0; i
< l
->nitems
; ++i
)
762 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
765 /* Don't relocate a shared blockvector more than once. */
769 bv
= BLOCKVECTOR (s
);
770 if (BLOCKVECTOR_MAP (bv
))
771 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
772 ANOFFSET (delta
, s
->block_line_section
));
774 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
778 struct dict_iterator iter
;
780 b
= BLOCKVECTOR_BLOCK (bv
, i
);
781 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
782 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
784 /* We only want to iterate over the local symbols, not any
785 symbols in included symtabs. */
786 ALL_DICT_SYMBOLS (BLOCK_DICT (b
), iter
, sym
)
788 relocate_one_symbol (sym
, objfile
, delta
);
794 /* Relocate isolated symbols. */
798 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
799 relocate_one_symbol (iter
, objfile
, delta
);
802 if (objfile
->psymtabs_addrmap
)
803 addrmap_relocate (objfile
->psymtabs_addrmap
,
804 ANOFFSET (delta
, SECT_OFF_TEXT (objfile
)));
807 objfile
->sf
->qf
->relocate (objfile
, new_offsets
, delta
);
810 struct minimal_symbol
*msym
;
812 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
813 if (SYMBOL_SECTION (msym
) >= 0)
814 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
816 /* Relocating different sections by different amounts may cause the symbols
817 to be out of order. */
818 msymbols_sort (objfile
);
820 if (objfile
->ei
.entry_point_p
)
822 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
823 only as a fallback. */
824 struct obj_section
*s
;
825 s
= find_pc_section (objfile
->ei
.entry_point
);
828 int idx
= gdb_bfd_section_index (objfile
->obfd
, s
->the_bfd_section
);
830 objfile
->ei
.entry_point
+= ANOFFSET (delta
, idx
);
833 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
839 for (i
= 0; i
< objfile
->num_sections
; ++i
)
840 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
843 /* Rebuild section map next time we need it. */
844 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
846 /* Update the table in exec_ops, used to read memory. */
847 ALL_OBJFILE_OSECTIONS (objfile
, s
)
849 int idx
= s
- objfile
->sections
;
851 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
852 obj_section_addr (s
));
855 /* Relocating probes. */
856 if (objfile
->sf
&& objfile
->sf
->sym_probe_fns
)
857 objfile
->sf
->sym_probe_fns
->sym_relocate_probe (objfile
,
864 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
865 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
867 The number and ordering of sections does differ between the two objfiles.
868 Only their names match. Also the file offsets will differ (objfile being
869 possibly prelinked but separate_debug_objfile is probably not prelinked) but
870 the in-memory absolute address as specified by NEW_OFFSETS must match both
874 objfile_relocate (struct objfile
*objfile
,
875 const struct section_offsets
*new_offsets
)
877 struct objfile
*debug_objfile
;
880 changed
|= objfile_relocate1 (objfile
, new_offsets
);
882 for (debug_objfile
= objfile
->separate_debug_objfile
;
884 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
886 struct section_addr_info
*objfile_addrs
;
887 struct section_offsets
*new_debug_offsets
;
888 struct cleanup
*my_cleanups
;
890 objfile_addrs
= build_section_addr_info_from_objfile (objfile
);
891 my_cleanups
= make_cleanup (xfree
, objfile_addrs
);
893 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
894 relative ones must be already created according to debug_objfile. */
896 addr_info_make_relative (objfile_addrs
, debug_objfile
->obfd
);
898 gdb_assert (debug_objfile
->num_sections
899 == gdb_bfd_count_sections (debug_objfile
->obfd
));
901 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
902 make_cleanup (xfree
, new_debug_offsets
);
903 relative_addr_info_to_section_offsets (new_debug_offsets
,
904 debug_objfile
->num_sections
,
907 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
);
909 do_cleanups (my_cleanups
);
912 /* Relocate breakpoints as necessary, after things are relocated. */
914 breakpoint_re_set ();
917 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
919 Return non-zero iff any change happened. */
922 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
924 struct section_offsets
*new_offsets
=
925 ((struct section_offsets
*)
926 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
929 for (i
= 0; i
< objfile
->num_sections
; ++i
)
930 new_offsets
->offsets
[i
] = slide
;
932 return objfile_relocate1 (objfile
, new_offsets
);
935 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
936 SEPARATE_DEBUG_OBJFILEs. */
939 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
941 struct objfile
*debug_objfile
;
944 changed
|= objfile_rebase1 (objfile
, slide
);
946 for (debug_objfile
= objfile
->separate_debug_objfile
;
948 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
949 changed
|= objfile_rebase1 (debug_objfile
, slide
);
951 /* Relocate breakpoints as necessary, after things are relocated. */
953 breakpoint_re_set ();
956 /* Return non-zero if OBJFILE has partial symbols. */
959 objfile_has_partial_symbols (struct objfile
*objfile
)
964 /* If we have not read psymbols, but we have a function capable of reading
965 them, then that is an indication that they are in fact available. Without
966 this function the symbols may have been already read in but they also may
967 not be present in this objfile. */
968 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
969 && objfile
->sf
->sym_read_psymbols
!= NULL
)
972 return objfile
->sf
->qf
->has_symbols (objfile
);
975 /* Return non-zero if OBJFILE has full symbols. */
978 objfile_has_full_symbols (struct objfile
*objfile
)
980 return objfile
->symtabs
!= NULL
;
983 /* Return non-zero if OBJFILE has full or partial symbols, either directly
984 or through a separate debug file. */
987 objfile_has_symbols (struct objfile
*objfile
)
991 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
992 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
998 /* Many places in gdb want to test just to see if we have any partial
999 symbols available. This function returns zero if none are currently
1000 available, nonzero otherwise. */
1003 have_partial_symbols (void)
1005 struct objfile
*ofp
;
1009 if (objfile_has_partial_symbols (ofp
))
1015 /* Many places in gdb want to test just to see if we have any full
1016 symbols available. This function returns zero if none are currently
1017 available, nonzero otherwise. */
1020 have_full_symbols (void)
1022 struct objfile
*ofp
;
1026 if (objfile_has_full_symbols (ofp
))
1033 /* This operations deletes all objfile entries that represent solibs that
1034 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1038 objfile_purge_solibs (void)
1040 struct objfile
*objf
;
1041 struct objfile
*temp
;
1043 ALL_OBJFILES_SAFE (objf
, temp
)
1045 /* We assume that the solib package has been purged already, or will
1048 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1049 free_objfile (objf
);
1054 /* Many places in gdb want to test just to see if we have any minimal
1055 symbols available. This function returns zero if none are currently
1056 available, nonzero otherwise. */
1059 have_minimal_symbols (void)
1061 struct objfile
*ofp
;
1065 if (ofp
->minimal_symbol_count
> 0)
1073 /* Qsort comparison function. */
1076 qsort_cmp (const void *a
, const void *b
)
1078 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1079 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1080 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1081 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1083 if (sect1_addr
< sect2_addr
)
1085 else if (sect1_addr
> sect2_addr
)
1089 /* Sections are at the same address. This could happen if
1090 A) we have an objfile and a separate debuginfo.
1091 B) we are confused, and have added sections without proper relocation,
1092 or something like that. */
1094 const struct objfile
*const objfile1
= sect1
->objfile
;
1095 const struct objfile
*const objfile2
= sect2
->objfile
;
1097 if (objfile1
->separate_debug_objfile
== objfile2
1098 || objfile2
->separate_debug_objfile
== objfile1
)
1100 /* Case A. The ordering doesn't matter: separate debuginfo files
1101 will be filtered out later. */
1106 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1107 triage. This section could be slow (since we iterate over all
1108 objfiles in each call to qsort_cmp), but this shouldn't happen
1109 very often (GDB is already in a confused state; one hopes this
1110 doesn't happen at all). If you discover that significant time is
1111 spent in the loops below, do 'set complaints 100' and examine the
1112 resulting complaints. */
1114 if (objfile1
== objfile2
)
1116 /* Both sections came from the same objfile. We are really confused.
1117 Sort on sequence order of sections within the objfile. */
1119 const struct obj_section
*osect
;
1121 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1124 else if (osect
== sect2
)
1127 /* We should have found one of the sections before getting here. */
1128 gdb_assert_not_reached ("section not found");
1132 /* Sort on sequence number of the objfile in the chain. */
1134 const struct objfile
*objfile
;
1136 ALL_OBJFILES (objfile
)
1137 if (objfile
== objfile1
)
1139 else if (objfile
== objfile2
)
1142 /* We should have found one of the objfiles before getting here. */
1143 gdb_assert_not_reached ("objfile not found");
1148 gdb_assert_not_reached ("unexpected code path");
1152 /* Select "better" obj_section to keep. We prefer the one that came from
1153 the real object, rather than the one from separate debuginfo.
1154 Most of the time the two sections are exactly identical, but with
1155 prelinking the .rel.dyn section in the real object may have different
1158 static struct obj_section
*
1159 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1161 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1162 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1163 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1164 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1165 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1167 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1172 /* Return 1 if SECTION should be inserted into the section map.
1173 We want to insert only non-overlay and non-TLS section. */
1176 insert_section_p (const struct bfd
*abfd
,
1177 const struct bfd_section
*section
)
1179 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1181 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1182 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1183 /* This is an overlay section. IN_MEMORY check is needed to avoid
1184 discarding sections from the "system supplied DSO" (aka vdso)
1185 on some Linux systems (e.g. Fedora 11). */
1187 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1188 /* This is a TLS section. */
1194 /* Filter out overlapping sections where one section came from the real
1195 objfile, and the other from a separate debuginfo file.
1196 Return the size of table after redundant sections have been eliminated. */
1199 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1203 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1205 struct obj_section
*const sect1
= map
[i
];
1206 struct obj_section
*const sect2
= map
[i
+ 1];
1207 const struct objfile
*const objfile1
= sect1
->objfile
;
1208 const struct objfile
*const objfile2
= sect2
->objfile
;
1209 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1210 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1212 if (sect1_addr
== sect2_addr
1213 && (objfile1
->separate_debug_objfile
== objfile2
1214 || objfile2
->separate_debug_objfile
== objfile1
))
1216 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1225 gdb_assert (i
== map_size
- 1);
1229 /* The map should not have shrunk to less than half the original size. */
1230 gdb_assert (map_size
/ 2 <= j
);
1235 /* Filter out overlapping sections, issuing a warning if any are found.
1236 Overlapping sections could really be overlay sections which we didn't
1237 classify as such in insert_section_p, or we could be dealing with a
1241 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1245 for (i
= 0, j
= 0; i
< map_size
- 1; )
1250 for (k
= i
+ 1; k
< map_size
; k
++)
1252 struct obj_section
*const sect1
= map
[i
];
1253 struct obj_section
*const sect2
= map
[k
];
1254 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1255 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1256 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1258 gdb_assert (sect1_addr
<= sect2_addr
);
1260 if (sect1_endaddr
<= sect2_addr
)
1264 /* We have an overlap. Report it. */
1266 struct objfile
*const objf1
= sect1
->objfile
;
1267 struct objfile
*const objf2
= sect2
->objfile
;
1269 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1270 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1272 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1274 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1276 complaint (&symfile_complaints
,
1277 _("unexpected overlap between:\n"
1278 " (A) section `%s' from `%s' [%s, %s)\n"
1279 " (B) section `%s' from `%s' [%s, %s).\n"
1280 "Will ignore section B"),
1281 bfd_section_name (abfd1
, bfds1
), objfile_name (objf1
),
1282 paddress (gdbarch
, sect1_addr
),
1283 paddress (gdbarch
, sect1_endaddr
),
1284 bfd_section_name (abfd2
, bfds2
), objfile_name (objf2
),
1285 paddress (gdbarch
, sect2_addr
),
1286 paddress (gdbarch
, sect2_endaddr
));
1294 gdb_assert (i
== map_size
- 1);
1302 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1303 TLS, overlay and overlapping sections. */
1306 update_section_map (struct program_space
*pspace
,
1307 struct obj_section
***pmap
, int *pmap_size
)
1309 struct objfile_pspace_info
*pspace_info
;
1310 int alloc_size
, map_size
, i
;
1311 struct obj_section
*s
, **map
;
1312 struct objfile
*objfile
;
1314 pspace_info
= get_objfile_pspace_data (pspace
);
1315 gdb_assert (pspace_info
->section_map_dirty
!= 0
1316 || pspace_info
->new_objfiles_available
!= 0);
1322 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1323 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1324 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1327 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1328 if (alloc_size
== 0)
1335 map
= xmalloc (alloc_size
* sizeof (*map
));
1338 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1339 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1340 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1343 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1344 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1345 map_size
= filter_overlapping_sections(map
, map_size
);
1347 if (map_size
< alloc_size
)
1348 /* Some sections were eliminated. Trim excess space. */
1349 map
= xrealloc (map
, map_size
* sizeof (*map
));
1351 gdb_assert (alloc_size
== map_size
);
1354 *pmap_size
= map_size
;
1357 /* Bsearch comparison function. */
1360 bsearch_cmp (const void *key
, const void *elt
)
1362 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1363 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1365 if (pc
< obj_section_addr (section
))
1367 if (pc
< obj_section_endaddr (section
))
1372 /* Returns a section whose range includes PC or NULL if none found. */
1374 struct obj_section
*
1375 find_pc_section (CORE_ADDR pc
)
1377 struct objfile_pspace_info
*pspace_info
;
1378 struct obj_section
*s
, **sp
;
1380 /* Check for mapped overlay section first. */
1381 s
= find_pc_mapped_section (pc
);
1385 pspace_info
= get_objfile_pspace_data (current_program_space
);
1386 if (pspace_info
->section_map_dirty
1387 || (pspace_info
->new_objfiles_available
1388 && !pspace_info
->inhibit_updates
))
1390 update_section_map (current_program_space
,
1391 &pspace_info
->sections
,
1392 &pspace_info
->num_sections
);
1394 /* Don't need updates to section map until objfiles are added,
1395 removed or relocated. */
1396 pspace_info
->new_objfiles_available
= 0;
1397 pspace_info
->section_map_dirty
= 0;
1400 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1401 bsearch be non-NULL. */
1402 if (pspace_info
->sections
== NULL
)
1404 gdb_assert (pspace_info
->num_sections
== 0);
1408 sp
= (struct obj_section
**) bsearch (&pc
,
1409 pspace_info
->sections
,
1410 pspace_info
->num_sections
,
1411 sizeof (*pspace_info
->sections
),
1419 /* Return non-zero if PC is in a section called NAME. */
1422 pc_in_section (CORE_ADDR pc
, char *name
)
1424 struct obj_section
*s
;
1427 s
= find_pc_section (pc
);
1430 && s
->the_bfd_section
->name
!= NULL
1431 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1436 /* Set section_map_dirty so section map will be rebuilt next time it
1437 is used. Called by reread_symbols. */
1440 objfiles_changed (void)
1442 /* Rebuild section map next time we need it. */
1443 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1446 /* See comments in objfiles.h. */
1449 inhibit_section_map_updates (struct program_space
*pspace
)
1451 get_objfile_pspace_data (pspace
)->inhibit_updates
= 1;
1454 /* See comments in objfiles.h. */
1457 resume_section_map_updates (struct program_space
*pspace
)
1459 get_objfile_pspace_data (pspace
)->inhibit_updates
= 0;
1462 /* See comments in objfiles.h. */
1465 resume_section_map_updates_cleanup (void *arg
)
1467 resume_section_map_updates (arg
);
1470 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1471 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1472 searching the objfiles in the order they are stored internally,
1473 ignoring CURRENT_OBJFILE.
1475 On most platorms, it should be close enough to doing the best
1476 we can without some knowledge specific to the architecture. */
1479 default_iterate_over_objfiles_in_search_order
1480 (struct gdbarch
*gdbarch
,
1481 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1482 void *cb_data
, struct objfile
*current_objfile
)
1485 struct objfile
*objfile
;
1487 ALL_OBJFILES (objfile
)
1489 stop
= cb (objfile
, cb_data
);
1495 /* Return canonical name for OBJFILE. */
1498 objfile_name (const struct objfile
*objfile
)
1500 if (objfile
->obfd
!= NULL
)
1501 return bfd_get_filename (objfile
->obfd
);
1503 return objfile
->original_name
;
1506 /* Provide a prototype to silence -Wmissing-prototypes. */
1507 extern initialize_file_ftype _initialize_objfiles
;
1510 _initialize_objfiles (void)
1512 objfiles_pspace_data
1513 = register_program_space_data_with_cleanup (NULL
,
1514 objfiles_pspace_data_cleanup
);
1516 objfiles_bfd_data
= register_bfd_data_with_cleanup (NULL
,
1517 objfile_bfd_data_free
);