1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2014 Free Software Foundation, Inc.
5 Contributed by Cygnus Support, using pieces from other GDB modules.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 /* This file contains support routines for creating, manipulating, and
23 destroying objfile structures. */
26 #include "bfd.h" /* Binary File Description */
30 #include "gdb-stabs.h"
33 #include "expression.h"
34 #include "parser-defs.h"
36 #include "gdb_assert.h"
37 #include <sys/types.h>
40 #include "gdb_obstack.h"
44 #include "breakpoint.h"
46 #include "dictionary.h"
49 #include "arch-utils.h"
52 #include "complaints.h"
58 /* Keep a registry of per-objfile data-pointers required by other GDB
61 DEFINE_REGISTRY (objfile
, REGISTRY_ACCESS_FIELD
)
63 /* Externally visible variables that are owned by this module.
64 See declarations in objfile.h for more info. */
66 struct objfile_pspace_info
68 struct obj_section
**sections
;
71 /* Nonzero if object files have been added since the section map
73 int new_objfiles_available
;
75 /* Nonzero if the section map MUST be updated before use. */
76 int section_map_dirty
;
78 /* Nonzero if section map updates should be inhibited if possible. */
82 /* Per-program-space data key. */
83 static const struct program_space_data
*objfiles_pspace_data
;
86 objfiles_pspace_data_cleanup (struct program_space
*pspace
, void *arg
)
88 struct objfile_pspace_info
*info
= arg
;
90 xfree (info
->sections
);
94 /* Get the current svr4 data. If none is found yet, add it now. This
95 function always returns a valid object. */
97 static struct objfile_pspace_info
*
98 get_objfile_pspace_data (struct program_space
*pspace
)
100 struct objfile_pspace_info
*info
;
102 info
= program_space_data (pspace
, objfiles_pspace_data
);
105 info
= XCNEW (struct objfile_pspace_info
);
106 set_program_space_data (pspace
, objfiles_pspace_data
, info
);
114 /* Per-BFD data key. */
116 static const struct bfd_data
*objfiles_bfd_data
;
118 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
119 NULL, and it already has a per-BFD storage object, use that.
120 Otherwise, allocate a new per-BFD storage object. If ABFD is not
121 NULL, the object is allocated on the BFD; otherwise it is allocated
122 on OBJFILE's obstack. Note that it is not safe to call this
123 multiple times for a given OBJFILE -- it can only be called when
124 allocating or re-initializing OBJFILE. */
126 static struct objfile_per_bfd_storage
*
127 get_objfile_bfd_data (struct objfile
*objfile
, struct bfd
*abfd
)
129 struct objfile_per_bfd_storage
*storage
= NULL
;
132 storage
= bfd_data (abfd
, objfiles_bfd_data
);
136 /* If the object requires gdb to do relocations, we simply fall
137 back to not sharing data across users. These cases are rare
138 enough that this seems reasonable. */
139 if (abfd
!= NULL
&& !gdb_bfd_requires_relocations (abfd
))
141 storage
= bfd_zalloc (abfd
, sizeof (struct objfile_per_bfd_storage
));
142 set_bfd_data (abfd
, objfiles_bfd_data
, storage
);
145 storage
= OBSTACK_ZALLOC (&objfile
->objfile_obstack
,
146 struct objfile_per_bfd_storage
);
148 /* Look up the gdbarch associated with the BFD. */
150 storage
->gdbarch
= gdbarch_from_bfd (abfd
);
152 obstack_init (&storage
->storage_obstack
);
153 storage
->filename_cache
= bcache_xmalloc (NULL
, NULL
);
154 storage
->macro_cache
= bcache_xmalloc (NULL
, NULL
);
155 storage
->language_of_main
= language_unknown
;
164 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage
*storage
)
166 bcache_xfree (storage
->filename_cache
);
167 bcache_xfree (storage
->macro_cache
);
168 if (storage
->demangled_names_hash
)
169 htab_delete (storage
->demangled_names_hash
);
170 obstack_free (&storage
->storage_obstack
, 0);
173 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
174 cleanup function to the BFD registry. */
177 objfile_bfd_data_free (struct bfd
*unused
, void *d
)
179 free_objfile_per_bfd_storage (d
);
182 /* See objfiles.h. */
185 set_objfile_per_bfd (struct objfile
*objfile
)
187 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, objfile
->obfd
);
190 /* Set the objfile's per-BFD notion of the "main" name and
194 set_objfile_main_name (struct objfile
*objfile
,
195 const char *name
, enum language lang
)
197 if (objfile
->per_bfd
->name_of_main
== NULL
198 || strcmp (objfile
->per_bfd
->name_of_main
, name
) != 0)
199 objfile
->per_bfd
->name_of_main
200 = obstack_copy0 (&objfile
->per_bfd
->storage_obstack
, name
, strlen (name
));
201 objfile
->per_bfd
->language_of_main
= lang
;
206 /* Called via bfd_map_over_sections to build up the section table that
207 the objfile references. The objfile contains pointers to the start
208 of the table (objfile->sections) and to the first location after
209 the end of the table (objfile->sections_end). */
212 add_to_objfile_sections_full (struct bfd
*abfd
, struct bfd_section
*asect
,
213 struct objfile
*objfile
, int force
)
215 struct obj_section
*section
;
221 aflag
= bfd_get_section_flags (abfd
, asect
);
222 if (!(aflag
& SEC_ALLOC
))
226 section
= &objfile
->sections
[gdb_bfd_section_index (abfd
, asect
)];
227 section
->objfile
= objfile
;
228 section
->the_bfd_section
= asect
;
229 section
->ovly_mapped
= 0;
233 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
236 add_to_objfile_sections_full (abfd
, asect
, objfilep
, 0);
239 /* Builds a section table for OBJFILE.
241 Note that the OFFSET and OVLY_MAPPED in each table entry are
242 initialized to zero. */
245 build_objfile_section_table (struct objfile
*objfile
)
247 int count
= gdb_bfd_count_sections (objfile
->obfd
);
249 objfile
->sections
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
252 objfile
->sections_end
= (objfile
->sections
+ count
);
253 bfd_map_over_sections (objfile
->obfd
,
254 add_to_objfile_sections
, (void *) objfile
);
256 /* See gdb_bfd_section_index. */
257 add_to_objfile_sections_full (objfile
->obfd
, bfd_com_section_ptr
, objfile
, 1);
258 add_to_objfile_sections_full (objfile
->obfd
, bfd_und_section_ptr
, objfile
, 1);
259 add_to_objfile_sections_full (objfile
->obfd
, bfd_abs_section_ptr
, objfile
, 1);
260 add_to_objfile_sections_full (objfile
->obfd
, bfd_ind_section_ptr
, objfile
, 1);
263 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
264 allocate a new objfile struct, fill it in as best we can, link it
265 into the list of all known objfiles, and return a pointer to the
268 NAME should contain original non-canonicalized filename or other
269 identifier as entered by user. If there is no better source use
270 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
271 NAME content is copied into returned objfile.
273 The FLAGS word contains various bits (OBJF_*) that can be taken as
274 requests for specific operations. Other bits like OBJF_SHARED are
275 simply copied through to the new objfile flags member. */
277 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
278 by jv-lang.c, to create an artificial objfile used to hold
279 information about dynamically-loaded Java classes. Unfortunately,
280 that branch of this function doesn't get tested very frequently, so
281 it's prone to breakage. (E.g. at one time the name was set to NULL
282 in that situation, which broke a loop over all names in the dynamic
283 library loader.) If you change this function, please try to leave
284 things in a consistent state even if abfd is NULL. */
287 allocate_objfile (bfd
*abfd
, const char *name
, int flags
)
289 struct objfile
*objfile
;
292 objfile
= (struct objfile
*) xzalloc (sizeof (struct objfile
));
293 objfile
->psymbol_cache
= psymbol_bcache_init ();
294 /* We could use obstack_specify_allocation here instead, but
295 gdb_obstack.h specifies the alloc/dealloc functions. */
296 obstack_init (&objfile
->objfile_obstack
);
297 terminate_minimal_symbol_table (objfile
);
299 objfile_alloc_data (objfile
);
303 gdb_assert (abfd
== NULL
);
304 gdb_assert ((flags
& OBJF_NOT_FILENAME
) != 0);
305 expanded_name
= xstrdup ("<<anonymous objfile>>");
307 else if ((flags
& OBJF_NOT_FILENAME
) != 0)
308 expanded_name
= xstrdup (name
);
310 expanded_name
= gdb_abspath (name
);
311 objfile
->original_name
= obstack_copy0 (&objfile
->objfile_obstack
,
313 strlen (expanded_name
));
314 xfree (expanded_name
);
316 /* Update the per-objfile information that comes from the bfd, ensuring
317 that any data that is reference is saved in the per-objfile data
320 /* Update the per-objfile information that comes from the bfd, ensuring
321 that any data that is reference is saved in the per-objfile data
324 objfile
->obfd
= abfd
;
328 objfile
->mtime
= bfd_get_mtime (abfd
);
330 /* Build section table. */
331 build_objfile_section_table (objfile
);
334 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, abfd
);
335 objfile
->pspace
= current_program_space
;
337 /* Initialize the section indexes for this objfile, so that we can
338 later detect if they are used w/o being properly assigned to. */
340 objfile
->sect_index_text
= -1;
341 objfile
->sect_index_data
= -1;
342 objfile
->sect_index_bss
= -1;
343 objfile
->sect_index_rodata
= -1;
345 /* Add this file onto the tail of the linked list of other such files. */
347 objfile
->next
= NULL
;
348 if (object_files
== NULL
)
349 object_files
= objfile
;
352 struct objfile
*last_one
;
354 for (last_one
= object_files
;
356 last_one
= last_one
->next
);
357 last_one
->next
= objfile
;
360 /* Save passed in flag bits. */
361 objfile
->flags
|= flags
;
363 /* Rebuild section map next time we need it. */
364 get_objfile_pspace_data (objfile
->pspace
)->new_objfiles_available
= 1;
369 /* Retrieve the gdbarch associated with OBJFILE. */
371 get_objfile_arch (struct objfile
*objfile
)
373 return objfile
->per_bfd
->gdbarch
;
376 /* If there is a valid and known entry point, function fills *ENTRY_P with it
377 and returns non-zero; otherwise it returns zero. */
380 entry_point_address_query (CORE_ADDR
*entry_p
)
382 if (symfile_objfile
== NULL
|| !symfile_objfile
->per_bfd
->ei
.entry_point_p
)
385 *entry_p
= (symfile_objfile
->per_bfd
->ei
.entry_point
386 + ANOFFSET (symfile_objfile
->section_offsets
,
387 symfile_objfile
->per_bfd
->ei
.the_bfd_section_index
));
392 /* Get current entry point address. Call error if it is not known. */
395 entry_point_address (void)
399 if (!entry_point_address_query (&retval
))
400 error (_("Entry point address is not known."));
405 /* Iterator on PARENT and every separate debug objfile of PARENT.
406 The usage pattern is:
407 for (objfile = parent;
409 objfile = objfile_separate_debug_iterate (parent, objfile))
414 objfile_separate_debug_iterate (const struct objfile
*parent
,
415 const struct objfile
*objfile
)
419 /* If any, return the first child. */
420 res
= objfile
->separate_debug_objfile
;
424 /* Common case where there is no separate debug objfile. */
425 if (objfile
== parent
)
428 /* Return the brother if any. Note that we don't iterate on brothers of
430 res
= objfile
->separate_debug_objfile_link
;
434 for (res
= objfile
->separate_debug_objfile_backlink
;
436 res
= res
->separate_debug_objfile_backlink
)
438 gdb_assert (res
!= NULL
);
439 if (res
->separate_debug_objfile_link
)
440 return res
->separate_debug_objfile_link
;
445 /* Put one object file before a specified on in the global list.
446 This can be used to make sure an object file is destroyed before
447 another when using ALL_OBJFILES_SAFE to free all objfiles. */
449 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
451 struct objfile
**objp
;
453 unlink_objfile (objfile
);
455 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
457 if (*objp
== before_this
)
459 objfile
->next
= *objp
;
465 internal_error (__FILE__
, __LINE__
,
466 _("put_objfile_before: before objfile not in list"));
469 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
472 It is not a bug, or error, to call this function if OBJFILE is not known
473 to be in the current list. This is done in the case of mapped objfiles,
474 for example, just to ensure that the mapped objfile doesn't appear twice
475 in the list. Since the list is threaded, linking in a mapped objfile
476 twice would create a circular list.
478 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
479 unlinking it, just to ensure that we have completely severed any linkages
480 between the OBJFILE and the list. */
483 unlink_objfile (struct objfile
*objfile
)
485 struct objfile
**objpp
;
487 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
489 if (*objpp
== objfile
)
491 *objpp
= (*objpp
)->next
;
492 objfile
->next
= NULL
;
497 internal_error (__FILE__
, __LINE__
,
498 _("unlink_objfile: objfile already unlinked"));
501 /* Add OBJFILE as a separate debug objfile of PARENT. */
504 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
506 gdb_assert (objfile
&& parent
);
508 /* Must not be already in a list. */
509 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
510 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
511 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
512 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
513 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
515 objfile
->separate_debug_objfile_backlink
= parent
;
516 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
517 parent
->separate_debug_objfile
= objfile
;
519 /* Put the separate debug object before the normal one, this is so that
520 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
521 put_objfile_before (objfile
, parent
);
524 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
528 free_objfile_separate_debug (struct objfile
*objfile
)
530 struct objfile
*child
;
532 for (child
= objfile
->separate_debug_objfile
; child
;)
534 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
535 free_objfile (child
);
540 /* Destroy an objfile and all the symtabs and psymtabs under it. */
543 free_objfile (struct objfile
*objfile
)
545 /* First notify observers that this objfile is about to be freed. */
546 observer_notify_free_objfile (objfile
);
548 /* Free all separate debug objfiles. */
549 free_objfile_separate_debug (objfile
);
551 if (objfile
->separate_debug_objfile_backlink
)
553 /* We freed the separate debug file, make sure the base objfile
554 doesn't reference it. */
555 struct objfile
*child
;
557 child
= objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
;
559 if (child
== objfile
)
561 /* OBJFILE is the first child. */
562 objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
=
563 objfile
->separate_debug_objfile_link
;
567 /* Find OBJFILE in the list. */
570 if (child
->separate_debug_objfile_link
== objfile
)
572 child
->separate_debug_objfile_link
=
573 objfile
->separate_debug_objfile_link
;
576 child
= child
->separate_debug_objfile_link
;
582 /* Remove any references to this objfile in the global value
584 preserve_values (objfile
);
586 /* It still may reference data modules have associated with the objfile and
587 the symbol file data. */
588 forget_cached_source_info_for_objfile (objfile
);
590 breakpoint_free_objfile (objfile
);
591 btrace_free_objfile (objfile
);
593 /* First do any symbol file specific actions required when we are
594 finished with a particular symbol file. Note that if the objfile
595 is using reusable symbol information (via mmalloc) then each of
596 these routines is responsible for doing the correct thing, either
597 freeing things which are valid only during this particular gdb
598 execution, or leaving them to be reused during the next one. */
600 if (objfile
->sf
!= NULL
)
602 (*objfile
->sf
->sym_finish
) (objfile
);
605 /* Discard any data modules have associated with the objfile. The function
606 still may reference objfile->obfd. */
607 objfile_free_data (objfile
);
610 gdb_bfd_unref (objfile
->obfd
);
612 free_objfile_per_bfd_storage (objfile
->per_bfd
);
614 /* Remove it from the chain of all objfiles. */
616 unlink_objfile (objfile
);
618 if (objfile
== symfile_objfile
)
619 symfile_objfile
= NULL
;
621 /* Before the symbol table code was redone to make it easier to
622 selectively load and remove information particular to a specific
623 linkage unit, gdb used to do these things whenever the monolithic
624 symbol table was blown away. How much still needs to be done
625 is unknown, but we play it safe for now and keep each action until
626 it is shown to be no longer needed. */
628 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
629 for example), so we need to call this here. */
630 clear_pc_function_cache ();
632 /* Clear globals which might have pointed into a removed objfile.
633 FIXME: It's not clear which of these are supposed to persist
634 between expressions and which ought to be reset each time. */
635 expression_context_block
= NULL
;
636 innermost_block
= NULL
;
638 /* Check to see if the current_source_symtab belongs to this objfile,
639 and if so, call clear_current_source_symtab_and_line. */
642 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
644 if (cursal
.symtab
&& cursal
.symtab
->objfile
== objfile
)
645 clear_current_source_symtab_and_line ();
648 if (objfile
->global_psymbols
.list
)
649 xfree (objfile
->global_psymbols
.list
);
650 if (objfile
->static_psymbols
.list
)
651 xfree (objfile
->static_psymbols
.list
);
652 /* Free the obstacks for non-reusable objfiles. */
653 psymbol_bcache_free (objfile
->psymbol_cache
);
654 obstack_free (&objfile
->objfile_obstack
, 0);
656 /* Rebuild section map next time we need it. */
657 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
659 /* The last thing we do is free the objfile struct itself. */
664 do_free_objfile_cleanup (void *obj
)
670 make_cleanup_free_objfile (struct objfile
*obj
)
672 return make_cleanup (do_free_objfile_cleanup
, obj
);
675 /* Free all the object files at once and clean up their users. */
678 free_all_objfiles (void)
680 struct objfile
*objfile
, *temp
;
683 /* Any objfile referencewould become stale. */
684 for (so
= master_so_list (); so
; so
= so
->next
)
685 gdb_assert (so
->objfile
== NULL
);
687 ALL_OBJFILES_SAFE (objfile
, temp
)
689 free_objfile (objfile
);
691 clear_symtab_users (0);
694 /* A helper function for objfile_relocate1 that relocates a single
698 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
699 struct section_offsets
*delta
)
701 fixup_symbol_section (sym
, objfile
);
703 /* The RS6000 code from which this was taken skipped
704 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
705 But I'm leaving out that test, on the theory that
706 they can't possibly pass the tests below. */
707 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
708 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
709 && SYMBOL_SECTION (sym
) >= 0)
711 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
715 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
716 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
717 Return non-zero iff any change happened. */
720 objfile_relocate1 (struct objfile
*objfile
,
721 const struct section_offsets
*new_offsets
)
723 struct obj_section
*s
;
724 struct section_offsets
*delta
=
725 ((struct section_offsets
*)
726 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
729 int something_changed
= 0;
731 for (i
= 0; i
< objfile
->num_sections
; ++i
)
734 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
735 if (ANOFFSET (delta
, i
) != 0)
736 something_changed
= 1;
738 if (!something_changed
)
741 /* OK, get all the symtabs. */
745 ALL_OBJFILE_SYMTABS (objfile
, s
)
748 struct blockvector
*bv
;
751 /* First the line table. */
755 for (i
= 0; i
< l
->nitems
; ++i
)
756 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
759 /* Don't relocate a shared blockvector more than once. */
763 bv
= BLOCKVECTOR (s
);
764 if (BLOCKVECTOR_MAP (bv
))
765 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
766 ANOFFSET (delta
, s
->block_line_section
));
768 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
772 struct dict_iterator iter
;
774 b
= BLOCKVECTOR_BLOCK (bv
, i
);
775 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
776 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
778 /* We only want to iterate over the local symbols, not any
779 symbols in included symtabs. */
780 ALL_DICT_SYMBOLS (BLOCK_DICT (b
), iter
, sym
)
782 relocate_one_symbol (sym
, objfile
, delta
);
788 /* Relocate isolated symbols. */
792 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
793 relocate_one_symbol (iter
, objfile
, delta
);
796 if (objfile
->psymtabs_addrmap
)
797 addrmap_relocate (objfile
->psymtabs_addrmap
,
798 ANOFFSET (delta
, SECT_OFF_TEXT (objfile
)));
801 objfile
->sf
->qf
->relocate (objfile
, new_offsets
, delta
);
804 struct minimal_symbol
*msym
;
806 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
807 if (MSYMBOL_SECTION (msym
) >= 0)
808 MSYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
,
809 MSYMBOL_SECTION (msym
));
811 /* Relocating different sections by different amounts may cause the symbols
812 to be out of order. */
813 msymbols_sort (objfile
);
818 for (i
= 0; i
< objfile
->num_sections
; ++i
)
819 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
822 /* Rebuild section map next time we need it. */
823 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
825 /* Update the table in exec_ops, used to read memory. */
826 ALL_OBJFILE_OSECTIONS (objfile
, s
)
828 int idx
= s
- objfile
->sections
;
830 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
831 obj_section_addr (s
));
834 /* Relocating probes. */
835 if (objfile
->sf
&& objfile
->sf
->sym_probe_fns
)
836 objfile
->sf
->sym_probe_fns
->sym_relocate_probe (objfile
,
843 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
844 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
846 The number and ordering of sections does differ between the two objfiles.
847 Only their names match. Also the file offsets will differ (objfile being
848 possibly prelinked but separate_debug_objfile is probably not prelinked) but
849 the in-memory absolute address as specified by NEW_OFFSETS must match both
853 objfile_relocate (struct objfile
*objfile
,
854 const struct section_offsets
*new_offsets
)
856 struct objfile
*debug_objfile
;
859 changed
|= objfile_relocate1 (objfile
, new_offsets
);
861 for (debug_objfile
= objfile
->separate_debug_objfile
;
863 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
865 struct section_addr_info
*objfile_addrs
;
866 struct section_offsets
*new_debug_offsets
;
867 struct cleanup
*my_cleanups
;
869 objfile_addrs
= build_section_addr_info_from_objfile (objfile
);
870 my_cleanups
= make_cleanup (xfree
, objfile_addrs
);
872 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
873 relative ones must be already created according to debug_objfile. */
875 addr_info_make_relative (objfile_addrs
, debug_objfile
->obfd
);
877 gdb_assert (debug_objfile
->num_sections
878 == gdb_bfd_count_sections (debug_objfile
->obfd
));
880 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
881 make_cleanup (xfree
, new_debug_offsets
);
882 relative_addr_info_to_section_offsets (new_debug_offsets
,
883 debug_objfile
->num_sections
,
886 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
);
888 do_cleanups (my_cleanups
);
891 /* Relocate breakpoints as necessary, after things are relocated. */
893 breakpoint_re_set ();
896 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
898 Return non-zero iff any change happened. */
901 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
903 struct section_offsets
*new_offsets
=
904 ((struct section_offsets
*)
905 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
908 for (i
= 0; i
< objfile
->num_sections
; ++i
)
909 new_offsets
->offsets
[i
] = slide
;
911 return objfile_relocate1 (objfile
, new_offsets
);
914 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
915 SEPARATE_DEBUG_OBJFILEs. */
918 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
920 struct objfile
*debug_objfile
;
923 changed
|= objfile_rebase1 (objfile
, slide
);
925 for (debug_objfile
= objfile
->separate_debug_objfile
;
927 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
928 changed
|= objfile_rebase1 (debug_objfile
, slide
);
930 /* Relocate breakpoints as necessary, after things are relocated. */
932 breakpoint_re_set ();
935 /* Return non-zero if OBJFILE has partial symbols. */
938 objfile_has_partial_symbols (struct objfile
*objfile
)
943 /* If we have not read psymbols, but we have a function capable of reading
944 them, then that is an indication that they are in fact available. Without
945 this function the symbols may have been already read in but they also may
946 not be present in this objfile. */
947 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
948 && objfile
->sf
->sym_read_psymbols
!= NULL
)
951 return objfile
->sf
->qf
->has_symbols (objfile
);
954 /* Return non-zero if OBJFILE has full symbols. */
957 objfile_has_full_symbols (struct objfile
*objfile
)
959 return objfile
->symtabs
!= NULL
;
962 /* Return non-zero if OBJFILE has full or partial symbols, either directly
963 or through a separate debug file. */
966 objfile_has_symbols (struct objfile
*objfile
)
970 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
971 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
977 /* Many places in gdb want to test just to see if we have any partial
978 symbols available. This function returns zero if none are currently
979 available, nonzero otherwise. */
982 have_partial_symbols (void)
988 if (objfile_has_partial_symbols (ofp
))
994 /* Many places in gdb want to test just to see if we have any full
995 symbols available. This function returns zero if none are currently
996 available, nonzero otherwise. */
999 have_full_symbols (void)
1001 struct objfile
*ofp
;
1005 if (objfile_has_full_symbols (ofp
))
1012 /* This operations deletes all objfile entries that represent solibs that
1013 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1017 objfile_purge_solibs (void)
1019 struct objfile
*objf
;
1020 struct objfile
*temp
;
1022 ALL_OBJFILES_SAFE (objf
, temp
)
1024 /* We assume that the solib package has been purged already, or will
1027 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1028 free_objfile (objf
);
1033 /* Many places in gdb want to test just to see if we have any minimal
1034 symbols available. This function returns zero if none are currently
1035 available, nonzero otherwise. */
1038 have_minimal_symbols (void)
1040 struct objfile
*ofp
;
1044 if (ofp
->minimal_symbol_count
> 0)
1052 /* Qsort comparison function. */
1055 qsort_cmp (const void *a
, const void *b
)
1057 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1058 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1059 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1060 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1062 if (sect1_addr
< sect2_addr
)
1064 else if (sect1_addr
> sect2_addr
)
1068 /* Sections are at the same address. This could happen if
1069 A) we have an objfile and a separate debuginfo.
1070 B) we are confused, and have added sections without proper relocation,
1071 or something like that. */
1073 const struct objfile
*const objfile1
= sect1
->objfile
;
1074 const struct objfile
*const objfile2
= sect2
->objfile
;
1076 if (objfile1
->separate_debug_objfile
== objfile2
1077 || objfile2
->separate_debug_objfile
== objfile1
)
1079 /* Case A. The ordering doesn't matter: separate debuginfo files
1080 will be filtered out later. */
1085 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1086 triage. This section could be slow (since we iterate over all
1087 objfiles in each call to qsort_cmp), but this shouldn't happen
1088 very often (GDB is already in a confused state; one hopes this
1089 doesn't happen at all). If you discover that significant time is
1090 spent in the loops below, do 'set complaints 100' and examine the
1091 resulting complaints. */
1093 if (objfile1
== objfile2
)
1095 /* Both sections came from the same objfile. We are really confused.
1096 Sort on sequence order of sections within the objfile. */
1098 const struct obj_section
*osect
;
1100 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1103 else if (osect
== sect2
)
1106 /* We should have found one of the sections before getting here. */
1107 gdb_assert_not_reached ("section not found");
1111 /* Sort on sequence number of the objfile in the chain. */
1113 const struct objfile
*objfile
;
1115 ALL_OBJFILES (objfile
)
1116 if (objfile
== objfile1
)
1118 else if (objfile
== objfile2
)
1121 /* We should have found one of the objfiles before getting here. */
1122 gdb_assert_not_reached ("objfile not found");
1127 gdb_assert_not_reached ("unexpected code path");
1131 /* Select "better" obj_section to keep. We prefer the one that came from
1132 the real object, rather than the one from separate debuginfo.
1133 Most of the time the two sections are exactly identical, but with
1134 prelinking the .rel.dyn section in the real object may have different
1137 static struct obj_section
*
1138 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1140 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1141 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1142 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1143 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1144 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1146 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1151 /* Return 1 if SECTION should be inserted into the section map.
1152 We want to insert only non-overlay and non-TLS section. */
1155 insert_section_p (const struct bfd
*abfd
,
1156 const struct bfd_section
*section
)
1158 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1160 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1161 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1162 /* This is an overlay section. IN_MEMORY check is needed to avoid
1163 discarding sections from the "system supplied DSO" (aka vdso)
1164 on some Linux systems (e.g. Fedora 11). */
1166 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1167 /* This is a TLS section. */
1173 /* Filter out overlapping sections where one section came from the real
1174 objfile, and the other from a separate debuginfo file.
1175 Return the size of table after redundant sections have been eliminated. */
1178 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1182 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1184 struct obj_section
*const sect1
= map
[i
];
1185 struct obj_section
*const sect2
= map
[i
+ 1];
1186 const struct objfile
*const objfile1
= sect1
->objfile
;
1187 const struct objfile
*const objfile2
= sect2
->objfile
;
1188 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1189 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1191 if (sect1_addr
== sect2_addr
1192 && (objfile1
->separate_debug_objfile
== objfile2
1193 || objfile2
->separate_debug_objfile
== objfile1
))
1195 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1204 gdb_assert (i
== map_size
- 1);
1208 /* The map should not have shrunk to less than half the original size. */
1209 gdb_assert (map_size
/ 2 <= j
);
1214 /* Filter out overlapping sections, issuing a warning if any are found.
1215 Overlapping sections could really be overlay sections which we didn't
1216 classify as such in insert_section_p, or we could be dealing with a
1220 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1224 for (i
= 0, j
= 0; i
< map_size
- 1; )
1229 for (k
= i
+ 1; k
< map_size
; k
++)
1231 struct obj_section
*const sect1
= map
[i
];
1232 struct obj_section
*const sect2
= map
[k
];
1233 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1234 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1235 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1237 gdb_assert (sect1_addr
<= sect2_addr
);
1239 if (sect1_endaddr
<= sect2_addr
)
1243 /* We have an overlap. Report it. */
1245 struct objfile
*const objf1
= sect1
->objfile
;
1246 struct objfile
*const objf2
= sect2
->objfile
;
1248 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1249 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1251 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1253 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1255 complaint (&symfile_complaints
,
1256 _("unexpected overlap between:\n"
1257 " (A) section `%s' from `%s' [%s, %s)\n"
1258 " (B) section `%s' from `%s' [%s, %s).\n"
1259 "Will ignore section B"),
1260 bfd_section_name (abfd1
, bfds1
), objfile_name (objf1
),
1261 paddress (gdbarch
, sect1_addr
),
1262 paddress (gdbarch
, sect1_endaddr
),
1263 bfd_section_name (abfd2
, bfds2
), objfile_name (objf2
),
1264 paddress (gdbarch
, sect2_addr
),
1265 paddress (gdbarch
, sect2_endaddr
));
1273 gdb_assert (i
== map_size
- 1);
1281 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1282 TLS, overlay and overlapping sections. */
1285 update_section_map (struct program_space
*pspace
,
1286 struct obj_section
***pmap
, int *pmap_size
)
1288 struct objfile_pspace_info
*pspace_info
;
1289 int alloc_size
, map_size
, i
;
1290 struct obj_section
*s
, **map
;
1291 struct objfile
*objfile
;
1293 pspace_info
= get_objfile_pspace_data (pspace
);
1294 gdb_assert (pspace_info
->section_map_dirty
!= 0
1295 || pspace_info
->new_objfiles_available
!= 0);
1301 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1302 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1303 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1306 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1307 if (alloc_size
== 0)
1314 map
= xmalloc (alloc_size
* sizeof (*map
));
1317 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1318 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1319 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1322 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1323 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1324 map_size
= filter_overlapping_sections(map
, map_size
);
1326 if (map_size
< alloc_size
)
1327 /* Some sections were eliminated. Trim excess space. */
1328 map
= xrealloc (map
, map_size
* sizeof (*map
));
1330 gdb_assert (alloc_size
== map_size
);
1333 *pmap_size
= map_size
;
1336 /* Bsearch comparison function. */
1339 bsearch_cmp (const void *key
, const void *elt
)
1341 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1342 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1344 if (pc
< obj_section_addr (section
))
1346 if (pc
< obj_section_endaddr (section
))
1351 /* Returns a section whose range includes PC or NULL if none found. */
1353 struct obj_section
*
1354 find_pc_section (CORE_ADDR pc
)
1356 struct objfile_pspace_info
*pspace_info
;
1357 struct obj_section
*s
, **sp
;
1359 /* Check for mapped overlay section first. */
1360 s
= find_pc_mapped_section (pc
);
1364 pspace_info
= get_objfile_pspace_data (current_program_space
);
1365 if (pspace_info
->section_map_dirty
1366 || (pspace_info
->new_objfiles_available
1367 && !pspace_info
->inhibit_updates
))
1369 update_section_map (current_program_space
,
1370 &pspace_info
->sections
,
1371 &pspace_info
->num_sections
);
1373 /* Don't need updates to section map until objfiles are added,
1374 removed or relocated. */
1375 pspace_info
->new_objfiles_available
= 0;
1376 pspace_info
->section_map_dirty
= 0;
1379 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1380 bsearch be non-NULL. */
1381 if (pspace_info
->sections
== NULL
)
1383 gdb_assert (pspace_info
->num_sections
== 0);
1387 sp
= (struct obj_section
**) bsearch (&pc
,
1388 pspace_info
->sections
,
1389 pspace_info
->num_sections
,
1390 sizeof (*pspace_info
->sections
),
1398 /* Return non-zero if PC is in a section called NAME. */
1401 pc_in_section (CORE_ADDR pc
, char *name
)
1403 struct obj_section
*s
;
1406 s
= find_pc_section (pc
);
1409 && s
->the_bfd_section
->name
!= NULL
1410 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1415 /* Set section_map_dirty so section map will be rebuilt next time it
1416 is used. Called by reread_symbols. */
1419 objfiles_changed (void)
1421 /* Rebuild section map next time we need it. */
1422 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1425 /* See comments in objfiles.h. */
1428 inhibit_section_map_updates (struct program_space
*pspace
)
1430 get_objfile_pspace_data (pspace
)->inhibit_updates
= 1;
1433 /* See comments in objfiles.h. */
1436 resume_section_map_updates (struct program_space
*pspace
)
1438 get_objfile_pspace_data (pspace
)->inhibit_updates
= 0;
1441 /* See comments in objfiles.h. */
1444 resume_section_map_updates_cleanup (void *arg
)
1446 resume_section_map_updates (arg
);
1449 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1453 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1455 struct obj_section
*osect
;
1457 if (objfile
== NULL
)
1460 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1462 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1465 if (obj_section_addr (osect
) <= addr
1466 && addr
< obj_section_endaddr (osect
))
1472 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1473 gdbarch method. It is equivalent to use the ALL_OBJFILES macro,
1474 searching the objfiles in the order they are stored internally,
1475 ignoring CURRENT_OBJFILE.
1477 On most platorms, it should be close enough to doing the best
1478 we can without some knowledge specific to the architecture. */
1481 default_iterate_over_objfiles_in_search_order
1482 (struct gdbarch
*gdbarch
,
1483 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1484 void *cb_data
, struct objfile
*current_objfile
)
1487 struct objfile
*objfile
;
1489 ALL_OBJFILES (objfile
)
1491 stop
= cb (objfile
, cb_data
);
1497 /* Return canonical name for OBJFILE. */
1500 objfile_name (const struct objfile
*objfile
)
1502 if (objfile
->obfd
!= NULL
)
1503 return bfd_get_filename (objfile
->obfd
);
1505 return objfile
->original_name
;
1508 /* Provide a prototype to silence -Wmissing-prototypes. */
1509 extern initialize_file_ftype _initialize_objfiles
;
1512 _initialize_objfiles (void)
1514 objfiles_pspace_data
1515 = register_program_space_data_with_cleanup (NULL
,
1516 objfiles_pspace_data_cleanup
);
1518 objfiles_bfd_data
= register_bfd_data_with_cleanup (NULL
,
1519 objfile_bfd_data_free
);