1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2019 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 <sys/types.h>
39 #include "gdb_obstack.h"
42 #include "breakpoint.h"
44 #include "dictionary.h"
47 #include "arch-utils.h"
49 #include "observable.h"
50 #include "complaints.h"
55 #include "gdbsupport/pathstuff.h"
59 /* Keep a registry of per-objfile data-pointers required by other GDB
62 DEFINE_REGISTRY (objfile
, REGISTRY_ACCESS_FIELD
)
64 /* Externally visible variables that are owned by this module.
65 See declarations in objfile.h for more info. */
67 struct objfile_pspace_info
69 objfile_pspace_info () = default;
70 ~objfile_pspace_info ();
72 struct obj_section
**sections
= nullptr;
75 /* Nonzero if object files have been added since the section map
77 int new_objfiles_available
= 0;
79 /* Nonzero if the section map MUST be updated before use. */
80 int section_map_dirty
= 0;
82 /* Nonzero if section map updates should be inhibited if possible. */
83 int inhibit_updates
= 0;
86 /* Per-program-space data key. */
87 static const struct program_space_key
<objfile_pspace_info
>
90 objfile_pspace_info::~objfile_pspace_info ()
95 /* Get the current svr4 data. If none is found yet, add it now. This
96 function always returns a valid object. */
98 static struct objfile_pspace_info
*
99 get_objfile_pspace_data (struct program_space
*pspace
)
101 struct objfile_pspace_info
*info
;
103 info
= objfiles_pspace_data
.get (pspace
);
105 info
= objfiles_pspace_data
.emplace (pspace
);
112 /* Per-BFD data key. */
114 static const struct bfd_key
<objfile_per_bfd_storage
> objfiles_bfd_data
;
116 objfile_per_bfd_storage::~objfile_per_bfd_storage ()
120 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
121 NULL, and it already has a per-BFD storage object, use that.
122 Otherwise, allocate a new per-BFD storage object. Note that it is
123 not safe to call this multiple times for a given OBJFILE -- it can
124 only be called when 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
= objfiles_bfd_data
.get (abfd
);
136 storage
= new objfile_per_bfd_storage
;
137 /* If the object requires gdb to do relocations, we simply fall
138 back to not sharing data across users. These cases are rare
139 enough that this seems reasonable. */
140 if (abfd
!= NULL
&& !gdb_bfd_requires_relocations (abfd
))
141 objfiles_bfd_data
.set (abfd
, storage
);
143 /* Look up the gdbarch associated with the BFD. */
145 storage
->gdbarch
= gdbarch_from_bfd (abfd
);
151 /* See objfiles.h. */
154 set_objfile_per_bfd (struct objfile
*objfile
)
156 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, objfile
->obfd
);
159 /* Set the objfile's per-BFD notion of the "main" name and
163 set_objfile_main_name (struct objfile
*objfile
,
164 const char *name
, enum language lang
)
166 if (objfile
->per_bfd
->name_of_main
== NULL
167 || strcmp (objfile
->per_bfd
->name_of_main
, name
) != 0)
168 objfile
->per_bfd
->name_of_main
169 = obstack_strdup (&objfile
->per_bfd
->storage_obstack
, name
);
170 objfile
->per_bfd
->language_of_main
= lang
;
173 /* Helper structure to map blocks to static link properties in hash tables. */
175 struct static_link_htab_entry
177 const struct block
*block
;
178 const struct dynamic_prop
*static_link
;
181 /* Return a hash code for struct static_link_htab_entry *P. */
184 static_link_htab_entry_hash (const void *p
)
186 const struct static_link_htab_entry
*e
187 = (const struct static_link_htab_entry
*) p
;
189 return htab_hash_pointer (e
->block
);
192 /* Return whether P1 an P2 (pointers to struct static_link_htab_entry) are
193 mappings for the same block. */
196 static_link_htab_entry_eq (const void *p1
, const void *p2
)
198 const struct static_link_htab_entry
*e1
199 = (const struct static_link_htab_entry
*) p1
;
200 const struct static_link_htab_entry
*e2
201 = (const struct static_link_htab_entry
*) p2
;
203 return e1
->block
== e2
->block
;
206 /* Register STATIC_LINK as the static link for BLOCK, which is part of OBJFILE.
207 Must not be called more than once for each BLOCK. */
210 objfile_register_static_link (struct objfile
*objfile
,
211 const struct block
*block
,
212 const struct dynamic_prop
*static_link
)
215 struct static_link_htab_entry lookup_entry
;
216 struct static_link_htab_entry
*entry
;
218 if (objfile
->static_links
== NULL
)
219 objfile
->static_links
.reset (htab_create_alloc
220 (1, &static_link_htab_entry_hash
, static_link_htab_entry_eq
, NULL
,
223 /* Create a slot for the mapping, make sure it's the first mapping for this
224 block and then create the mapping itself. */
225 lookup_entry
.block
= block
;
226 slot
= htab_find_slot (objfile
->static_links
.get (), &lookup_entry
, INSERT
);
227 gdb_assert (*slot
== NULL
);
229 entry
= XOBNEW (&objfile
->objfile_obstack
, static_link_htab_entry
);
230 entry
->block
= block
;
231 entry
->static_link
= static_link
;
232 *slot
= (void *) entry
;
235 /* Look for a static link for BLOCK, which is part of OBJFILE. Return NULL if
238 const struct dynamic_prop
*
239 objfile_lookup_static_link (struct objfile
*objfile
,
240 const struct block
*block
)
242 struct static_link_htab_entry
*entry
;
243 struct static_link_htab_entry lookup_entry
;
245 if (objfile
->static_links
== NULL
)
247 lookup_entry
.block
= block
;
248 entry
= ((struct static_link_htab_entry
*)
249 htab_find (objfile
->static_links
.get (), &lookup_entry
));
253 gdb_assert (entry
->block
== block
);
254 return entry
->static_link
;
259 /* Called via bfd_map_over_sections to build up the section table that
260 the objfile references. The objfile contains pointers to the start
261 of the table (objfile->sections) and to the first location after
262 the end of the table (objfile->sections_end). */
265 add_to_objfile_sections_full (struct bfd
*abfd
, struct bfd_section
*asect
,
266 struct objfile
*objfile
, int force
)
268 struct obj_section
*section
;
274 aflag
= bfd_section_flags (asect
);
275 if (!(aflag
& SEC_ALLOC
))
279 section
= &objfile
->sections
[gdb_bfd_section_index (abfd
, asect
)];
280 section
->objfile
= objfile
;
281 section
->the_bfd_section
= asect
;
282 section
->ovly_mapped
= 0;
286 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
289 add_to_objfile_sections_full (abfd
, asect
, (struct objfile
*) objfilep
, 0);
292 /* Builds a section table for OBJFILE.
294 Note that the OFFSET and OVLY_MAPPED in each table entry are
295 initialized to zero. */
298 build_objfile_section_table (struct objfile
*objfile
)
300 int count
= gdb_bfd_count_sections (objfile
->obfd
);
302 objfile
->sections
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
305 objfile
->sections_end
= (objfile
->sections
+ count
);
306 bfd_map_over_sections (objfile
->obfd
,
307 add_to_objfile_sections
, (void *) objfile
);
309 /* See gdb_bfd_section_index. */
310 add_to_objfile_sections_full (objfile
->obfd
, bfd_com_section_ptr
, objfile
, 1);
311 add_to_objfile_sections_full (objfile
->obfd
, bfd_und_section_ptr
, objfile
, 1);
312 add_to_objfile_sections_full (objfile
->obfd
, bfd_abs_section_ptr
, objfile
, 1);
313 add_to_objfile_sections_full (objfile
->obfd
, bfd_ind_section_ptr
, objfile
, 1);
316 /* Given a pointer to an initialized bfd (ABFD) and some flag bits,
317 initialize the new objfile as best we can and link it into the list
318 of all known objfiles.
320 NAME should contain original non-canonicalized filename or other
321 identifier as entered by user. If there is no better source use
322 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
323 NAME content is copied into returned objfile.
325 The FLAGS word contains various bits (OBJF_*) that can be taken as
326 requests for specific operations. Other bits like OBJF_SHARED are
327 simply copied through to the new objfile flags member. */
329 objfile::objfile (bfd
*abfd
, const char *name
, objfile_flags flags_
)
331 pspace (current_program_space
),
332 partial_symtabs (new psymtab_storage ()),
335 const char *expanded_name
;
337 /* We could use obstack_specify_allocation here instead, but
338 gdb_obstack.h specifies the alloc/dealloc functions. */
339 obstack_init (&objfile_obstack
);
341 objfile_alloc_data (this);
343 gdb::unique_xmalloc_ptr
<char> name_holder
;
346 gdb_assert (abfd
== NULL
);
347 gdb_assert ((flags
& OBJF_NOT_FILENAME
) != 0);
348 expanded_name
= "<<anonymous objfile>>";
350 else if ((flags
& OBJF_NOT_FILENAME
) != 0
351 || is_target_filename (name
))
352 expanded_name
= name
;
355 name_holder
= gdb_abspath (name
);
356 expanded_name
= name_holder
.get ();
358 original_name
= obstack_strdup (&objfile_obstack
, expanded_name
);
360 /* Update the per-objfile information that comes from the bfd, ensuring
361 that any data that is reference is saved in the per-objfile data
367 mtime
= bfd_get_mtime (abfd
);
369 /* Build section table. */
370 build_objfile_section_table (this);
373 per_bfd
= get_objfile_bfd_data (this, abfd
);
375 /* Add this file onto the tail of the linked list of other such files. */
377 if (object_files
== NULL
)
381 struct objfile
*last_one
;
383 for (last_one
= object_files
;
385 last_one
= last_one
->next
);
386 last_one
->next
= this;
389 /* Rebuild section map next time we need it. */
390 get_objfile_pspace_data (pspace
)->new_objfiles_available
= 1;
393 /* Retrieve the gdbarch associated with OBJFILE. */
396 get_objfile_arch (const struct objfile
*objfile
)
398 return objfile
->per_bfd
->gdbarch
;
401 /* If there is a valid and known entry point, function fills *ENTRY_P with it
402 and returns non-zero; otherwise it returns zero. */
405 entry_point_address_query (CORE_ADDR
*entry_p
)
407 if (symfile_objfile
== NULL
|| !symfile_objfile
->per_bfd
->ei
.entry_point_p
)
410 *entry_p
= (symfile_objfile
->per_bfd
->ei
.entry_point
411 + ANOFFSET (symfile_objfile
->section_offsets
,
412 symfile_objfile
->per_bfd
->ei
.the_bfd_section_index
));
417 /* Get current entry point address. Call error if it is not known. */
420 entry_point_address (void)
424 if (!entry_point_address_query (&retval
))
425 error (_("Entry point address is not known."));
430 separate_debug_iterator
&
431 separate_debug_iterator::operator++ ()
433 gdb_assert (m_objfile
!= nullptr);
437 /* If any, return the first child. */
438 res
= m_objfile
->separate_debug_objfile
;
445 /* Common case where there is no separate debug objfile. */
446 if (m_objfile
== m_parent
)
452 /* Return the brother if any. Note that we don't iterate on brothers of
454 res
= m_objfile
->separate_debug_objfile_link
;
461 for (res
= m_objfile
->separate_debug_objfile_backlink
;
463 res
= res
->separate_debug_objfile_backlink
)
465 gdb_assert (res
!= nullptr);
466 if (res
->separate_debug_objfile_link
!= nullptr)
468 m_objfile
= res
->separate_debug_objfile_link
;
476 /* Put one object file before a specified on in the global list.
477 This can be used to make sure an object file is destroyed before
478 another when using objfiles_safe to free all objfiles. */
480 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
482 struct objfile
**objp
;
484 unlink_objfile (objfile
);
486 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
488 if (*objp
== before_this
)
490 objfile
->next
= *objp
;
496 internal_error (__FILE__
, __LINE__
,
497 _("put_objfile_before: before objfile not in list"));
500 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
503 It is not a bug, or error, to call this function if OBJFILE is not known
504 to be in the current list. This is done in the case of mapped objfiles,
505 for example, just to ensure that the mapped objfile doesn't appear twice
506 in the list. Since the list is threaded, linking in a mapped objfile
507 twice would create a circular list.
509 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
510 unlinking it, just to ensure that we have completely severed any linkages
511 between the OBJFILE and the list. */
514 unlink_objfile (struct objfile
*objfile
)
516 struct objfile
**objpp
;
518 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
520 if (*objpp
== objfile
)
522 *objpp
= (*objpp
)->next
;
523 objfile
->next
= NULL
;
528 internal_error (__FILE__
, __LINE__
,
529 _("unlink_objfile: objfile already unlinked"));
532 /* Add OBJFILE as a separate debug objfile of PARENT. */
535 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
537 gdb_assert (objfile
&& parent
);
539 /* Must not be already in a list. */
540 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
541 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
542 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
543 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
544 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
546 objfile
->separate_debug_objfile_backlink
= parent
;
547 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
548 parent
->separate_debug_objfile
= objfile
;
550 /* Put the separate debug object before the normal one, this is so that
551 usage of objfiles_safe will stay safe. */
552 put_objfile_before (objfile
, parent
);
555 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
559 free_objfile_separate_debug (struct objfile
*objfile
)
561 struct objfile
*child
;
563 for (child
= objfile
->separate_debug_objfile
; child
;)
565 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
571 /* Destroy an objfile and all the symtabs and psymtabs under it. */
575 /* First notify observers that this objfile is about to be freed. */
576 gdb::observers::free_objfile
.notify (this);
578 /* Free all separate debug objfiles. */
579 free_objfile_separate_debug (this);
581 if (separate_debug_objfile_backlink
)
583 /* We freed the separate debug file, make sure the base objfile
584 doesn't reference it. */
585 struct objfile
*child
;
587 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
591 /* THIS is the first child. */
592 separate_debug_objfile_backlink
->separate_debug_objfile
=
593 separate_debug_objfile_link
;
597 /* Find THIS in the list. */
600 if (child
->separate_debug_objfile_link
== this)
602 child
->separate_debug_objfile_link
=
603 separate_debug_objfile_link
;
606 child
= child
->separate_debug_objfile_link
;
612 /* Remove any references to this objfile in the global value
614 preserve_values (this);
616 /* It still may reference data modules have associated with the objfile and
617 the symbol file data. */
618 forget_cached_source_info_for_objfile (this);
620 breakpoint_free_objfile (this);
621 btrace_free_objfile (this);
623 /* First do any symbol file specific actions required when we are
624 finished with a particular symbol file. Note that if the objfile
625 is using reusable symbol information (via mmalloc) then each of
626 these routines is responsible for doing the correct thing, either
627 freeing things which are valid only during this particular gdb
628 execution, or leaving them to be reused during the next one. */
631 (*sf
->sym_finish
) (this);
633 /* Discard any data modules have associated with the objfile. The function
634 still may reference obfd. */
635 objfile_free_data (this);
638 gdb_bfd_unref (obfd
);
642 /* Remove it from the chain of all objfiles. */
644 unlink_objfile (this);
646 if (this == symfile_objfile
)
647 symfile_objfile
= NULL
;
649 /* Before the symbol table code was redone to make it easier to
650 selectively load and remove information particular to a specific
651 linkage unit, gdb used to do these things whenever the monolithic
652 symbol table was blown away. How much still needs to be done
653 is unknown, but we play it safe for now and keep each action until
654 it is shown to be no longer needed. */
656 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
657 for example), so we need to call this here. */
658 clear_pc_function_cache ();
660 /* Check to see if the current_source_symtab belongs to this objfile,
661 and if so, call clear_current_source_symtab_and_line. */
664 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
666 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
667 clear_current_source_symtab_and_line ();
670 /* Free the obstacks for non-reusable objfiles. */
671 obstack_free (&objfile_obstack
, 0);
673 /* Rebuild section map next time we need it. */
674 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
677 /* Free all the object files at once and clean up their users. */
680 free_all_objfiles (void)
684 /* Any objfile reference would become stale. */
685 for (so
= master_so_list (); so
; so
= so
->next
)
686 gdb_assert (so
->objfile
== NULL
);
688 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
690 clear_symtab_users (0);
693 /* A helper function for objfile_relocate1 that relocates a single
697 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
698 struct section_offsets
*delta
)
700 fixup_symbol_section (sym
, objfile
);
702 /* The RS6000 code from which this was taken skipped
703 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
704 But I'm leaving out that test, on the theory that
705 they can't possibly pass the tests below. */
706 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
707 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
708 && SYMBOL_SECTION (sym
) >= 0)
710 SET_SYMBOL_VALUE_ADDRESS (sym
,
711 SYMBOL_VALUE_ADDRESS (sym
)
712 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
716 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
717 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
718 Return non-zero iff any change happened. */
721 objfile_relocate1 (struct objfile
*objfile
,
722 const struct section_offsets
*new_offsets
)
724 struct section_offsets
*delta
=
725 ((struct section_offsets
*)
726 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
728 int something_changed
= 0;
730 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
733 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
734 if (ANOFFSET (delta
, i
) != 0)
735 something_changed
= 1;
737 if (!something_changed
)
740 /* OK, get all the symtabs. */
742 for (compunit_symtab
*cust
: objfile
->compunits ())
744 for (symtab
*s
: compunit_filetabs (cust
))
748 /* First the line table. */
749 l
= SYMTAB_LINETABLE (s
);
752 for (int i
= 0; i
< l
->nitems
; ++i
)
753 l
->item
[i
].pc
+= ANOFFSET (delta
,
754 COMPUNIT_BLOCK_LINE_SECTION
760 for (compunit_symtab
*cust
: objfile
->compunits ())
762 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
763 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
765 if (BLOCKVECTOR_MAP (bv
))
766 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
767 ANOFFSET (delta
, block_line_section
));
769 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
773 struct mdict_iterator miter
;
775 b
= BLOCKVECTOR_BLOCK (bv
, i
);
776 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
777 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
779 if (BLOCK_RANGES (b
) != nullptr)
780 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
782 BLOCK_RANGE_START (b
, j
)
783 += ANOFFSET (delta
, block_line_section
);
784 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
788 /* We only want to iterate over the local symbols, not any
789 symbols in included symtabs. */
790 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
792 relocate_one_symbol (sym
, objfile
, delta
);
798 /* This stores relocated addresses and so must be cleared. This
799 will cause it to be recreated on demand. */
800 objfile
->psymbol_map
.clear ();
802 /* Relocate isolated symbols. */
806 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
807 relocate_one_symbol (iter
, objfile
, delta
);
813 for (i
= 0; i
< objfile
->num_sections
; ++i
)
814 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
817 /* Rebuild section map next time we need it. */
818 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
820 /* Update the table in exec_ops, used to read memory. */
821 struct obj_section
*s
;
822 ALL_OBJFILE_OSECTIONS (objfile
, s
)
824 int idx
= s
- objfile
->sections
;
826 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
827 obj_section_addr (s
));
834 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
835 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
837 The number and ordering of sections does differ between the two objfiles.
838 Only their names match. Also the file offsets will differ (objfile being
839 possibly prelinked but separate_debug_objfile is probably not prelinked) but
840 the in-memory absolute address as specified by NEW_OFFSETS must match both
844 objfile_relocate (struct objfile
*objfile
,
845 const struct section_offsets
*new_offsets
)
849 changed
|= objfile_relocate1 (objfile
, new_offsets
);
851 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
853 if (debug_objfile
== objfile
)
856 section_addr_info objfile_addrs
857 = build_section_addr_info_from_objfile (objfile
);
859 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
860 relative ones must be already created according to debug_objfile. */
862 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
864 gdb_assert (debug_objfile
->num_sections
865 == gdb_bfd_count_sections (debug_objfile
->obfd
));
866 std::vector
<struct section_offsets
>
867 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
868 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
869 debug_objfile
->num_sections
,
872 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
875 /* Relocate breakpoints as necessary, after things are relocated. */
877 breakpoint_re_set ();
880 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
882 Return non-zero iff any change happened. */
885 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
887 struct section_offsets
*new_offsets
=
888 ((struct section_offsets
*)
889 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
892 for (i
= 0; i
< objfile
->num_sections
; ++i
)
893 new_offsets
->offsets
[i
] = slide
;
895 return objfile_relocate1 (objfile
, new_offsets
);
898 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
899 SEPARATE_DEBUG_OBJFILEs. */
902 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
906 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
907 changed
|= objfile_rebase1 (debug_objfile
, slide
);
909 /* Relocate breakpoints as necessary, after things are relocated. */
911 breakpoint_re_set ();
914 /* Return non-zero if OBJFILE has partial symbols. */
917 objfile_has_partial_symbols (struct objfile
*objfile
)
922 /* If we have not read psymbols, but we have a function capable of reading
923 them, then that is an indication that they are in fact available. Without
924 this function the symbols may have been already read in but they also may
925 not be present in this objfile. */
926 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
927 && objfile
->sf
->sym_read_psymbols
!= NULL
)
930 return objfile
->sf
->qf
->has_symbols (objfile
);
933 /* Return non-zero if OBJFILE has full symbols. */
936 objfile_has_full_symbols (struct objfile
*objfile
)
938 return objfile
->compunit_symtabs
!= NULL
;
941 /* Return non-zero if OBJFILE has full or partial symbols, either directly
942 or through a separate debug file. */
945 objfile_has_symbols (struct objfile
*objfile
)
947 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
948 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
954 /* Many places in gdb want to test just to see if we have any partial
955 symbols available. This function returns zero if none are currently
956 available, nonzero otherwise. */
959 have_partial_symbols (void)
961 for (objfile
*ofp
: current_program_space
->objfiles ())
963 if (objfile_has_partial_symbols (ofp
))
969 /* Many places in gdb want to test just to see if we have any full
970 symbols available. This function returns zero if none are currently
971 available, nonzero otherwise. */
974 have_full_symbols (void)
976 for (objfile
*ofp
: current_program_space
->objfiles ())
978 if (objfile_has_full_symbols (ofp
))
985 /* This operations deletes all objfile entries that represent solibs that
986 weren't explicitly loaded by the user, via e.g., the add-symbol-file
990 objfile_purge_solibs (void)
992 for (objfile
*objf
: current_program_space
->objfiles_safe ())
994 /* We assume that the solib package has been purged already, or will
997 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1003 /* Many places in gdb want to test just to see if we have any minimal
1004 symbols available. This function returns zero if none are currently
1005 available, nonzero otherwise. */
1008 have_minimal_symbols (void)
1010 for (objfile
*ofp
: current_program_space
->objfiles ())
1012 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
1020 /* Qsort comparison function. */
1023 qsort_cmp (const void *a
, const void *b
)
1025 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1026 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1027 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1028 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1030 if (sect1_addr
< sect2_addr
)
1032 else if (sect1_addr
> sect2_addr
)
1036 /* Sections are at the same address. This could happen if
1037 A) we have an objfile and a separate debuginfo.
1038 B) we are confused, and have added sections without proper relocation,
1039 or something like that. */
1041 const struct objfile
*const objfile1
= sect1
->objfile
;
1042 const struct objfile
*const objfile2
= sect2
->objfile
;
1044 if (objfile1
->separate_debug_objfile
== objfile2
1045 || objfile2
->separate_debug_objfile
== objfile1
)
1047 /* Case A. The ordering doesn't matter: separate debuginfo files
1048 will be filtered out later. */
1053 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1054 triage. This section could be slow (since we iterate over all
1055 objfiles in each call to qsort_cmp), but this shouldn't happen
1056 very often (GDB is already in a confused state; one hopes this
1057 doesn't happen at all). If you discover that significant time is
1058 spent in the loops below, do 'set complaints 100' and examine the
1059 resulting complaints. */
1061 if (objfile1
== objfile2
)
1063 /* Both sections came from the same objfile. We are really confused.
1064 Sort on sequence order of sections within the objfile. */
1066 const struct obj_section
*osect
;
1068 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1071 else if (osect
== sect2
)
1074 /* We should have found one of the sections before getting here. */
1075 gdb_assert_not_reached ("section not found");
1079 /* Sort on sequence number of the objfile in the chain. */
1081 for (objfile
*objfile
: current_program_space
->objfiles ())
1082 if (objfile
== objfile1
)
1084 else if (objfile
== objfile2
)
1087 /* We should have found one of the objfiles before getting here. */
1088 gdb_assert_not_reached ("objfile not found");
1093 gdb_assert_not_reached ("unexpected code path");
1097 /* Select "better" obj_section to keep. We prefer the one that came from
1098 the real object, rather than the one from separate debuginfo.
1099 Most of the time the two sections are exactly identical, but with
1100 prelinking the .rel.dyn section in the real object may have different
1103 static struct obj_section
*
1104 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1106 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1107 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1108 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1109 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1110 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1112 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1117 /* Return 1 if SECTION should be inserted into the section map.
1118 We want to insert only non-overlay and non-TLS section. */
1121 insert_section_p (const struct bfd
*abfd
,
1122 const struct bfd_section
*section
)
1124 const bfd_vma lma
= bfd_section_lma (section
);
1126 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1127 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1128 /* This is an overlay section. IN_MEMORY check is needed to avoid
1129 discarding sections from the "system supplied DSO" (aka vdso)
1130 on some Linux systems (e.g. Fedora 11). */
1132 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1133 /* This is a TLS section. */
1139 /* Filter out overlapping sections where one section came from the real
1140 objfile, and the other from a separate debuginfo file.
1141 Return the size of table after redundant sections have been eliminated. */
1144 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1148 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1150 struct obj_section
*const sect1
= map
[i
];
1151 struct obj_section
*const sect2
= map
[i
+ 1];
1152 const struct objfile
*const objfile1
= sect1
->objfile
;
1153 const struct objfile
*const objfile2
= sect2
->objfile
;
1154 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1155 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1157 if (sect1_addr
== sect2_addr
1158 && (objfile1
->separate_debug_objfile
== objfile2
1159 || objfile2
->separate_debug_objfile
== objfile1
))
1161 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1170 gdb_assert (i
== map_size
- 1);
1174 /* The map should not have shrunk to less than half the original size. */
1175 gdb_assert (map_size
/ 2 <= j
);
1180 /* Filter out overlapping sections, issuing a warning if any are found.
1181 Overlapping sections could really be overlay sections which we didn't
1182 classify as such in insert_section_p, or we could be dealing with a
1186 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1190 for (i
= 0, j
= 0; i
< map_size
- 1; )
1195 for (k
= i
+ 1; k
< map_size
; k
++)
1197 struct obj_section
*const sect1
= map
[i
];
1198 struct obj_section
*const sect2
= map
[k
];
1199 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1200 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1201 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1203 gdb_assert (sect1_addr
<= sect2_addr
);
1205 if (sect1_endaddr
<= sect2_addr
)
1209 /* We have an overlap. Report it. */
1211 struct objfile
*const objf1
= sect1
->objfile
;
1212 struct objfile
*const objf2
= sect2
->objfile
;
1214 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1215 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1217 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1219 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1221 complaint (_("unexpected overlap between:\n"
1222 " (A) section `%s' from `%s' [%s, %s)\n"
1223 " (B) section `%s' from `%s' [%s, %s).\n"
1224 "Will ignore section B"),
1225 bfd_section_name (bfds1
), objfile_name (objf1
),
1226 paddress (gdbarch
, sect1_addr
),
1227 paddress (gdbarch
, sect1_endaddr
),
1228 bfd_section_name (bfds2
), objfile_name (objf2
),
1229 paddress (gdbarch
, sect2_addr
),
1230 paddress (gdbarch
, sect2_endaddr
));
1238 gdb_assert (i
== map_size
- 1);
1246 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1247 TLS, overlay and overlapping sections. */
1250 update_section_map (struct program_space
*pspace
,
1251 struct obj_section
***pmap
, int *pmap_size
)
1253 struct objfile_pspace_info
*pspace_info
;
1254 int alloc_size
, map_size
, i
;
1255 struct obj_section
*s
, **map
;
1257 pspace_info
= get_objfile_pspace_data (pspace
);
1258 gdb_assert (pspace_info
->section_map_dirty
!= 0
1259 || pspace_info
->new_objfiles_available
!= 0);
1265 for (objfile
*objfile
: pspace
->objfiles ())
1266 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1267 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1270 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1271 if (alloc_size
== 0)
1278 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1281 for (objfile
*objfile
: pspace
->objfiles ())
1282 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1283 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1286 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1287 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1288 map_size
= filter_overlapping_sections(map
, map_size
);
1290 if (map_size
< alloc_size
)
1291 /* Some sections were eliminated. Trim excess space. */
1292 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1294 gdb_assert (alloc_size
== map_size
);
1297 *pmap_size
= map_size
;
1300 /* Bsearch comparison function. */
1303 bsearch_cmp (const void *key
, const void *elt
)
1305 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1306 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1308 if (pc
< obj_section_addr (section
))
1310 if (pc
< obj_section_endaddr (section
))
1315 /* Returns a section whose range includes PC or NULL if none found. */
1317 struct obj_section
*
1318 find_pc_section (CORE_ADDR pc
)
1320 struct objfile_pspace_info
*pspace_info
;
1321 struct obj_section
*s
, **sp
;
1323 /* Check for mapped overlay section first. */
1324 s
= find_pc_mapped_section (pc
);
1328 pspace_info
= get_objfile_pspace_data (current_program_space
);
1329 if (pspace_info
->section_map_dirty
1330 || (pspace_info
->new_objfiles_available
1331 && !pspace_info
->inhibit_updates
))
1333 update_section_map (current_program_space
,
1334 &pspace_info
->sections
,
1335 &pspace_info
->num_sections
);
1337 /* Don't need updates to section map until objfiles are added,
1338 removed or relocated. */
1339 pspace_info
->new_objfiles_available
= 0;
1340 pspace_info
->section_map_dirty
= 0;
1343 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1344 bsearch be non-NULL. */
1345 if (pspace_info
->sections
== NULL
)
1347 gdb_assert (pspace_info
->num_sections
== 0);
1351 sp
= (struct obj_section
**) bsearch (&pc
,
1352 pspace_info
->sections
,
1353 pspace_info
->num_sections
,
1354 sizeof (*pspace_info
->sections
),
1362 /* Return non-zero if PC is in a section called NAME. */
1365 pc_in_section (CORE_ADDR pc
, const char *name
)
1367 struct obj_section
*s
;
1370 s
= find_pc_section (pc
);
1373 && s
->the_bfd_section
->name
!= NULL
1374 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1379 /* Set section_map_dirty so section map will be rebuilt next time it
1380 is used. Called by reread_symbols. */
1383 objfiles_changed (void)
1385 /* Rebuild section map next time we need it. */
1386 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1389 /* See comments in objfiles.h. */
1391 scoped_restore_tmpl
<int>
1392 inhibit_section_map_updates (struct program_space
*pspace
)
1394 return scoped_restore_tmpl
<int>
1395 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1398 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1402 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1404 struct obj_section
*osect
;
1406 if (objfile
== NULL
)
1409 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1411 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1414 if (obj_section_addr (osect
) <= addr
1415 && addr
< obj_section_endaddr (osect
))
1422 shared_objfile_contains_address_p (struct program_space
*pspace
,
1425 for (objfile
*objfile
: pspace
->objfiles ())
1427 if ((objfile
->flags
& OBJF_SHARED
) != 0
1428 && is_addr_in_objfile (address
, objfile
))
1435 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1436 gdbarch method. It is equivalent to use the objfiles iterable,
1437 searching the objfiles in the order they are stored internally,
1438 ignoring CURRENT_OBJFILE.
1440 On most platforms, it should be close enough to doing the best
1441 we can without some knowledge specific to the architecture. */
1444 default_iterate_over_objfiles_in_search_order
1445 (struct gdbarch
*gdbarch
,
1446 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1447 void *cb_data
, struct objfile
*current_objfile
)
1451 for (objfile
*objfile
: current_program_space
->objfiles ())
1453 stop
= cb (objfile
, cb_data
);
1459 /* See objfiles.h. */
1462 objfile_name (const struct objfile
*objfile
)
1464 if (objfile
->obfd
!= NULL
)
1465 return bfd_get_filename (objfile
->obfd
);
1467 return objfile
->original_name
;
1470 /* See objfiles.h. */
1473 objfile_filename (const struct objfile
*objfile
)
1475 if (objfile
->obfd
!= NULL
)
1476 return bfd_get_filename (objfile
->obfd
);
1481 /* See objfiles.h. */
1484 objfile_debug_name (const struct objfile
*objfile
)
1486 return lbasename (objfile
->original_name
);
1489 /* See objfiles.h. */
1492 objfile_flavour_name (struct objfile
*objfile
)
1494 if (objfile
->obfd
!= NULL
)
1495 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));