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 /* Unlink OBJFILE from the list of known objfiles. */
479 unlink_objfile (struct objfile
*objfile
)
481 struct objfile
**objpp
;
483 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
485 if (*objpp
== objfile
)
487 *objpp
= (*objpp
)->next
;
488 objfile
->next
= NULL
;
493 internal_error (__FILE__
, __LINE__
,
494 _("unlink_objfile: objfile already unlinked"));
497 /* Put one object file before a specified on in the global list.
498 This can be used to make sure an object file is destroyed before
499 another when using objfiles_safe to free all objfiles. */
501 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
503 struct objfile
**objp
;
505 unlink_objfile (objfile
);
507 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
509 if (*objp
== before_this
)
511 objfile
->next
= *objp
;
517 internal_error (__FILE__
, __LINE__
,
518 _("put_objfile_before: before objfile not in list"));
521 /* Add OBJFILE as a separate debug objfile of PARENT. */
524 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
526 gdb_assert (objfile
&& parent
);
528 /* Must not be already in a list. */
529 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
530 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
531 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
532 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
533 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
535 objfile
->separate_debug_objfile_backlink
= parent
;
536 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
537 parent
->separate_debug_objfile
= objfile
;
539 /* Put the separate debug object before the normal one, this is so that
540 usage of objfiles_safe will stay safe. */
541 put_objfile_before (objfile
, parent
);
544 /* See objfiles.h. */
547 objfile::make (bfd
*bfd_
, const char *name_
, objfile_flags flags_
,
550 objfile
*result
= new objfile (bfd_
, name_
, flags_
);
551 if (parent
!= nullptr)
552 add_separate_debug_objfile (result
, parent
);
556 /* See objfiles.h. */
564 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
568 free_objfile_separate_debug (struct objfile
*objfile
)
570 struct objfile
*child
;
572 for (child
= objfile
->separate_debug_objfile
; child
;)
574 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
580 /* Destroy an objfile and all the symtabs and psymtabs under it. */
584 /* First notify observers that this objfile is about to be freed. */
585 gdb::observers::free_objfile
.notify (this);
587 /* Free all separate debug objfiles. */
588 free_objfile_separate_debug (this);
590 if (separate_debug_objfile_backlink
)
592 /* We freed the separate debug file, make sure the base objfile
593 doesn't reference it. */
594 struct objfile
*child
;
596 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
600 /* THIS is the first child. */
601 separate_debug_objfile_backlink
->separate_debug_objfile
=
602 separate_debug_objfile_link
;
606 /* Find THIS in the list. */
609 if (child
->separate_debug_objfile_link
== this)
611 child
->separate_debug_objfile_link
=
612 separate_debug_objfile_link
;
615 child
= child
->separate_debug_objfile_link
;
621 /* Remove any references to this objfile in the global value
623 preserve_values (this);
625 /* It still may reference data modules have associated with the objfile and
626 the symbol file data. */
627 forget_cached_source_info_for_objfile (this);
629 breakpoint_free_objfile (this);
630 btrace_free_objfile (this);
632 /* First do any symbol file specific actions required when we are
633 finished with a particular symbol file. Note that if the objfile
634 is using reusable symbol information (via mmalloc) then each of
635 these routines is responsible for doing the correct thing, either
636 freeing things which are valid only during this particular gdb
637 execution, or leaving them to be reused during the next one. */
640 (*sf
->sym_finish
) (this);
642 /* Discard any data modules have associated with the objfile. The function
643 still may reference obfd. */
644 objfile_free_data (this);
647 gdb_bfd_unref (obfd
);
651 /* Remove it from the chain of all objfiles. */
653 unlink_objfile (this);
655 if (this == symfile_objfile
)
656 symfile_objfile
= NULL
;
658 /* Before the symbol table code was redone to make it easier to
659 selectively load and remove information particular to a specific
660 linkage unit, gdb used to do these things whenever the monolithic
661 symbol table was blown away. How much still needs to be done
662 is unknown, but we play it safe for now and keep each action until
663 it is shown to be no longer needed. */
665 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
666 for example), so we need to call this here. */
667 clear_pc_function_cache ();
669 /* Check to see if the current_source_symtab belongs to this objfile,
670 and if so, call clear_current_source_symtab_and_line. */
673 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
675 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
676 clear_current_source_symtab_and_line ();
679 /* Free the obstacks for non-reusable objfiles. */
680 obstack_free (&objfile_obstack
, 0);
682 /* Rebuild section map next time we need it. */
683 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
686 /* Free all the object files at once and clean up their users. */
689 free_all_objfiles (void)
693 /* Any objfile reference would become stale. */
694 for (so
= master_so_list (); so
; so
= so
->next
)
695 gdb_assert (so
->objfile
== NULL
);
697 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
699 clear_symtab_users (0);
702 /* A helper function for objfile_relocate1 that relocates a single
706 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
707 struct section_offsets
*delta
)
709 fixup_symbol_section (sym
, objfile
);
711 /* The RS6000 code from which this was taken skipped
712 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
713 But I'm leaving out that test, on the theory that
714 they can't possibly pass the tests below. */
715 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
716 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
717 && SYMBOL_SECTION (sym
) >= 0)
719 SET_SYMBOL_VALUE_ADDRESS (sym
,
720 SYMBOL_VALUE_ADDRESS (sym
)
721 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
725 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
726 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
727 Return non-zero iff any change happened. */
730 objfile_relocate1 (struct objfile
*objfile
,
731 const struct section_offsets
*new_offsets
)
733 struct section_offsets
*delta
=
734 ((struct section_offsets
*)
735 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
737 int something_changed
= 0;
739 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
742 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
743 if (ANOFFSET (delta
, i
) != 0)
744 something_changed
= 1;
746 if (!something_changed
)
749 /* OK, get all the symtabs. */
751 for (compunit_symtab
*cust
: objfile
->compunits ())
753 for (symtab
*s
: compunit_filetabs (cust
))
757 /* First the line table. */
758 l
= SYMTAB_LINETABLE (s
);
761 for (int i
= 0; i
< l
->nitems
; ++i
)
762 l
->item
[i
].pc
+= ANOFFSET (delta
,
763 COMPUNIT_BLOCK_LINE_SECTION
769 for (compunit_symtab
*cust
: objfile
->compunits ())
771 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
772 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
774 if (BLOCKVECTOR_MAP (bv
))
775 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
776 ANOFFSET (delta
, block_line_section
));
778 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
782 struct mdict_iterator miter
;
784 b
= BLOCKVECTOR_BLOCK (bv
, i
);
785 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
786 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
788 if (BLOCK_RANGES (b
) != nullptr)
789 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
791 BLOCK_RANGE_START (b
, j
)
792 += ANOFFSET (delta
, block_line_section
);
793 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
797 /* We only want to iterate over the local symbols, not any
798 symbols in included symtabs. */
799 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
801 relocate_one_symbol (sym
, objfile
, delta
);
807 /* This stores relocated addresses and so must be cleared. This
808 will cause it to be recreated on demand. */
809 objfile
->psymbol_map
.clear ();
811 /* Relocate isolated symbols. */
815 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
816 relocate_one_symbol (iter
, objfile
, delta
);
822 for (i
= 0; i
< objfile
->num_sections
; ++i
)
823 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
826 /* Rebuild section map next time we need it. */
827 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
829 /* Update the table in exec_ops, used to read memory. */
830 struct obj_section
*s
;
831 ALL_OBJFILE_OSECTIONS (objfile
, s
)
833 int idx
= s
- objfile
->sections
;
835 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
836 obj_section_addr (s
));
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
)
858 changed
|= objfile_relocate1 (objfile
, new_offsets
);
860 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
862 if (debug_objfile
== objfile
)
865 section_addr_info objfile_addrs
866 = build_section_addr_info_from_objfile (objfile
);
868 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
869 relative ones must be already created according to debug_objfile. */
871 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
873 gdb_assert (debug_objfile
->num_sections
874 == gdb_bfd_count_sections (debug_objfile
->obfd
));
875 std::vector
<struct section_offsets
>
876 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
877 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
878 debug_objfile
->num_sections
,
881 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
884 /* Relocate breakpoints as necessary, after things are relocated. */
886 breakpoint_re_set ();
889 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
891 Return non-zero iff any change happened. */
894 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
896 struct section_offsets
*new_offsets
=
897 ((struct section_offsets
*)
898 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
901 for (i
= 0; i
< objfile
->num_sections
; ++i
)
902 new_offsets
->offsets
[i
] = slide
;
904 return objfile_relocate1 (objfile
, new_offsets
);
907 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
908 SEPARATE_DEBUG_OBJFILEs. */
911 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
915 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
916 changed
|= objfile_rebase1 (debug_objfile
, slide
);
918 /* Relocate breakpoints as necessary, after things are relocated. */
920 breakpoint_re_set ();
923 /* Return non-zero if OBJFILE has partial symbols. */
926 objfile_has_partial_symbols (struct objfile
*objfile
)
931 /* If we have not read psymbols, but we have a function capable of reading
932 them, then that is an indication that they are in fact available. Without
933 this function the symbols may have been already read in but they also may
934 not be present in this objfile. */
935 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
936 && objfile
->sf
->sym_read_psymbols
!= NULL
)
939 return objfile
->sf
->qf
->has_symbols (objfile
);
942 /* Return non-zero if OBJFILE has full symbols. */
945 objfile_has_full_symbols (struct objfile
*objfile
)
947 return objfile
->compunit_symtabs
!= NULL
;
950 /* Return non-zero if OBJFILE has full or partial symbols, either directly
951 or through a separate debug file. */
954 objfile_has_symbols (struct objfile
*objfile
)
956 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
957 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
963 /* Many places in gdb want to test just to see if we have any partial
964 symbols available. This function returns zero if none are currently
965 available, nonzero otherwise. */
968 have_partial_symbols (void)
970 for (objfile
*ofp
: current_program_space
->objfiles ())
972 if (objfile_has_partial_symbols (ofp
))
978 /* Many places in gdb want to test just to see if we have any full
979 symbols available. This function returns zero if none are currently
980 available, nonzero otherwise. */
983 have_full_symbols (void)
985 for (objfile
*ofp
: current_program_space
->objfiles ())
987 if (objfile_has_full_symbols (ofp
))
994 /* This operations deletes all objfile entries that represent solibs that
995 weren't explicitly loaded by the user, via e.g., the add-symbol-file
999 objfile_purge_solibs (void)
1001 for (objfile
*objf
: current_program_space
->objfiles_safe ())
1003 /* We assume that the solib package has been purged already, or will
1006 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1012 /* Many places in gdb want to test just to see if we have any minimal
1013 symbols available. This function returns zero if none are currently
1014 available, nonzero otherwise. */
1017 have_minimal_symbols (void)
1019 for (objfile
*ofp
: current_program_space
->objfiles ())
1021 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
1029 /* Qsort comparison function. */
1032 sort_cmp (const struct obj_section
*sect1
, const obj_section
*sect2
)
1034 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1035 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1037 if (sect1_addr
< sect2_addr
)
1039 else if (sect1_addr
> sect2_addr
)
1043 /* Sections are at the same address. This could happen if
1044 A) we have an objfile and a separate debuginfo.
1045 B) we are confused, and have added sections without proper relocation,
1046 or something like that. */
1048 const struct objfile
*const objfile1
= sect1
->objfile
;
1049 const struct objfile
*const objfile2
= sect2
->objfile
;
1051 if (objfile1
->separate_debug_objfile
== objfile2
1052 || objfile2
->separate_debug_objfile
== objfile1
)
1054 /* Case A. The ordering doesn't matter: separate debuginfo files
1055 will be filtered out later. */
1060 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1061 triage. This section could be slow (since we iterate over all
1062 objfiles in each call to sort_cmp), but this shouldn't happen
1063 very often (GDB is already in a confused state; one hopes this
1064 doesn't happen at all). If you discover that significant time is
1065 spent in the loops below, do 'set complaints 100' and examine the
1066 resulting complaints. */
1067 if (objfile1
== objfile2
)
1069 /* Both sections came from the same objfile. We are really
1070 confused. Sort on sequence order of sections within the
1071 objfile. The order of checks is important here, if we find a
1072 match on SECT2 first then either SECT2 is before SECT1, or,
1073 SECT2 == SECT1, in both cases we should return false. The
1074 second case shouldn't occur during normal use, but std::sort
1075 does check that '!(a < a)' when compiled in debug mode. */
1077 const struct obj_section
*osect
;
1079 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1082 else if (osect
== sect1
)
1085 /* We should have found one of the sections before getting here. */
1086 gdb_assert_not_reached ("section not found");
1090 /* Sort on sequence number of the objfile in the chain. */
1092 for (objfile
*objfile
: current_program_space
->objfiles ())
1093 if (objfile
== objfile1
)
1095 else if (objfile
== objfile2
)
1098 /* We should have found one of the objfiles before getting here. */
1099 gdb_assert_not_reached ("objfile not found");
1104 gdb_assert_not_reached ("unexpected code path");
1108 /* Select "better" obj_section to keep. We prefer the one that came from
1109 the real object, rather than the one from separate debuginfo.
1110 Most of the time the two sections are exactly identical, but with
1111 prelinking the .rel.dyn section in the real object may have different
1114 static struct obj_section
*
1115 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1117 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1118 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1119 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1120 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1121 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1123 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1128 /* Return 1 if SECTION should be inserted into the section map.
1129 We want to insert only non-overlay and non-TLS section. */
1132 insert_section_p (const struct bfd
*abfd
,
1133 const struct bfd_section
*section
)
1135 const bfd_vma lma
= bfd_section_lma (section
);
1137 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1138 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1139 /* This is an overlay section. IN_MEMORY check is needed to avoid
1140 discarding sections from the "system supplied DSO" (aka vdso)
1141 on some Linux systems (e.g. Fedora 11). */
1143 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1144 /* This is a TLS section. */
1150 /* Filter out overlapping sections where one section came from the real
1151 objfile, and the other from a separate debuginfo file.
1152 Return the size of table after redundant sections have been eliminated. */
1155 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1159 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1161 struct obj_section
*const sect1
= map
[i
];
1162 struct obj_section
*const sect2
= map
[i
+ 1];
1163 const struct objfile
*const objfile1
= sect1
->objfile
;
1164 const struct objfile
*const objfile2
= sect2
->objfile
;
1165 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1166 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1168 if (sect1_addr
== sect2_addr
1169 && (objfile1
->separate_debug_objfile
== objfile2
1170 || objfile2
->separate_debug_objfile
== objfile1
))
1172 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1181 gdb_assert (i
== map_size
- 1);
1185 /* The map should not have shrunk to less than half the original size. */
1186 gdb_assert (map_size
/ 2 <= j
);
1191 /* Filter out overlapping sections, issuing a warning if any are found.
1192 Overlapping sections could really be overlay sections which we didn't
1193 classify as such in insert_section_p, or we could be dealing with a
1197 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1201 for (i
= 0, j
= 0; i
< map_size
- 1; )
1206 for (k
= i
+ 1; k
< map_size
; k
++)
1208 struct obj_section
*const sect1
= map
[i
];
1209 struct obj_section
*const sect2
= map
[k
];
1210 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1211 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1212 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1214 gdb_assert (sect1_addr
<= sect2_addr
);
1216 if (sect1_endaddr
<= sect2_addr
)
1220 /* We have an overlap. Report it. */
1222 struct objfile
*const objf1
= sect1
->objfile
;
1223 struct objfile
*const objf2
= sect2
->objfile
;
1225 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1226 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1228 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1230 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1232 complaint (_("unexpected overlap between:\n"
1233 " (A) section `%s' from `%s' [%s, %s)\n"
1234 " (B) section `%s' from `%s' [%s, %s).\n"
1235 "Will ignore section B"),
1236 bfd_section_name (bfds1
), objfile_name (objf1
),
1237 paddress (gdbarch
, sect1_addr
),
1238 paddress (gdbarch
, sect1_endaddr
),
1239 bfd_section_name (bfds2
), objfile_name (objf2
),
1240 paddress (gdbarch
, sect2_addr
),
1241 paddress (gdbarch
, sect2_endaddr
));
1249 gdb_assert (i
== map_size
- 1);
1257 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1258 TLS, overlay and overlapping sections. */
1261 update_section_map (struct program_space
*pspace
,
1262 struct obj_section
***pmap
, int *pmap_size
)
1264 struct objfile_pspace_info
*pspace_info
;
1265 int alloc_size
, map_size
, i
;
1266 struct obj_section
*s
, **map
;
1268 pspace_info
= get_objfile_pspace_data (pspace
);
1269 gdb_assert (pspace_info
->section_map_dirty
!= 0
1270 || pspace_info
->new_objfiles_available
!= 0);
1276 for (objfile
*objfile
: pspace
->objfiles ())
1277 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1278 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1281 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1282 if (alloc_size
== 0)
1289 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1292 for (objfile
*objfile
: pspace
->objfiles ())
1293 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1294 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1297 std::sort (map
, map
+ alloc_size
, sort_cmp
);
1298 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1299 map_size
= filter_overlapping_sections(map
, map_size
);
1301 if (map_size
< alloc_size
)
1302 /* Some sections were eliminated. Trim excess space. */
1303 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1305 gdb_assert (alloc_size
== map_size
);
1308 *pmap_size
= map_size
;
1311 /* Bsearch comparison function. */
1314 bsearch_cmp (const void *key
, const void *elt
)
1316 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1317 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1319 if (pc
< obj_section_addr (section
))
1321 if (pc
< obj_section_endaddr (section
))
1326 /* Returns a section whose range includes PC or NULL if none found. */
1328 struct obj_section
*
1329 find_pc_section (CORE_ADDR pc
)
1331 struct objfile_pspace_info
*pspace_info
;
1332 struct obj_section
*s
, **sp
;
1334 /* Check for mapped overlay section first. */
1335 s
= find_pc_mapped_section (pc
);
1339 pspace_info
= get_objfile_pspace_data (current_program_space
);
1340 if (pspace_info
->section_map_dirty
1341 || (pspace_info
->new_objfiles_available
1342 && !pspace_info
->inhibit_updates
))
1344 update_section_map (current_program_space
,
1345 &pspace_info
->sections
,
1346 &pspace_info
->num_sections
);
1348 /* Don't need updates to section map until objfiles are added,
1349 removed or relocated. */
1350 pspace_info
->new_objfiles_available
= 0;
1351 pspace_info
->section_map_dirty
= 0;
1354 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1355 bsearch be non-NULL. */
1356 if (pspace_info
->sections
== NULL
)
1358 gdb_assert (pspace_info
->num_sections
== 0);
1362 sp
= (struct obj_section
**) bsearch (&pc
,
1363 pspace_info
->sections
,
1364 pspace_info
->num_sections
,
1365 sizeof (*pspace_info
->sections
),
1373 /* Return non-zero if PC is in a section called NAME. */
1376 pc_in_section (CORE_ADDR pc
, const char *name
)
1378 struct obj_section
*s
;
1381 s
= find_pc_section (pc
);
1384 && s
->the_bfd_section
->name
!= NULL
1385 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1390 /* Set section_map_dirty so section map will be rebuilt next time it
1391 is used. Called by reread_symbols. */
1394 objfiles_changed (void)
1396 /* Rebuild section map next time we need it. */
1397 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1400 /* See comments in objfiles.h. */
1402 scoped_restore_tmpl
<int>
1403 inhibit_section_map_updates (struct program_space
*pspace
)
1405 return scoped_restore_tmpl
<int>
1406 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1409 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1413 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1415 struct obj_section
*osect
;
1417 if (objfile
== NULL
)
1420 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1422 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1425 if (obj_section_addr (osect
) <= addr
1426 && addr
< obj_section_endaddr (osect
))
1433 shared_objfile_contains_address_p (struct program_space
*pspace
,
1436 for (objfile
*objfile
: pspace
->objfiles ())
1438 if ((objfile
->flags
& OBJF_SHARED
) != 0
1439 && is_addr_in_objfile (address
, objfile
))
1446 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1447 gdbarch method. It is equivalent to use the objfiles iterable,
1448 searching the objfiles in the order they are stored internally,
1449 ignoring CURRENT_OBJFILE.
1451 On most platforms, it should be close enough to doing the best
1452 we can without some knowledge specific to the architecture. */
1455 default_iterate_over_objfiles_in_search_order
1456 (struct gdbarch
*gdbarch
,
1457 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1458 void *cb_data
, struct objfile
*current_objfile
)
1462 for (objfile
*objfile
: current_program_space
->objfiles ())
1464 stop
= cb (objfile
, cb_data
);
1470 /* See objfiles.h. */
1473 objfile_name (const struct objfile
*objfile
)
1475 if (objfile
->obfd
!= NULL
)
1476 return bfd_get_filename (objfile
->obfd
);
1478 return objfile
->original_name
;
1481 /* See objfiles.h. */
1484 objfile_filename (const struct objfile
*objfile
)
1486 if (objfile
->obfd
!= NULL
)
1487 return bfd_get_filename (objfile
->obfd
);
1492 /* See objfiles.h. */
1495 objfile_debug_name (const struct objfile
*objfile
)
1497 return lbasename (objfile
->original_name
);
1500 /* See objfiles.h. */
1503 objfile_flavour_name (struct objfile
*objfile
)
1505 if (objfile
->obfd
!= NULL
)
1506 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));