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 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
560 free_objfile_separate_debug (struct objfile
*objfile
)
562 struct objfile
*child
;
564 for (child
= objfile
->separate_debug_objfile
; child
;)
566 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
572 /* Destroy an objfile and all the symtabs and psymtabs under it. */
576 /* First notify observers that this objfile is about to be freed. */
577 gdb::observers::free_objfile
.notify (this);
579 /* Free all separate debug objfiles. */
580 free_objfile_separate_debug (this);
582 if (separate_debug_objfile_backlink
)
584 /* We freed the separate debug file, make sure the base objfile
585 doesn't reference it. */
586 struct objfile
*child
;
588 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
592 /* THIS is the first child. */
593 separate_debug_objfile_backlink
->separate_debug_objfile
=
594 separate_debug_objfile_link
;
598 /* Find THIS in the list. */
601 if (child
->separate_debug_objfile_link
== this)
603 child
->separate_debug_objfile_link
=
604 separate_debug_objfile_link
;
607 child
= child
->separate_debug_objfile_link
;
613 /* Remove any references to this objfile in the global value
615 preserve_values (this);
617 /* It still may reference data modules have associated with the objfile and
618 the symbol file data. */
619 forget_cached_source_info_for_objfile (this);
621 breakpoint_free_objfile (this);
622 btrace_free_objfile (this);
624 /* First do any symbol file specific actions required when we are
625 finished with a particular symbol file. Note that if the objfile
626 is using reusable symbol information (via mmalloc) then each of
627 these routines is responsible for doing the correct thing, either
628 freeing things which are valid only during this particular gdb
629 execution, or leaving them to be reused during the next one. */
632 (*sf
->sym_finish
) (this);
634 /* Discard any data modules have associated with the objfile. The function
635 still may reference obfd. */
636 objfile_free_data (this);
639 gdb_bfd_unref (obfd
);
643 /* Remove it from the chain of all objfiles. */
645 unlink_objfile (this);
647 if (this == symfile_objfile
)
648 symfile_objfile
= NULL
;
650 /* Before the symbol table code was redone to make it easier to
651 selectively load and remove information particular to a specific
652 linkage unit, gdb used to do these things whenever the monolithic
653 symbol table was blown away. How much still needs to be done
654 is unknown, but we play it safe for now and keep each action until
655 it is shown to be no longer needed. */
657 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
658 for example), so we need to call this here. */
659 clear_pc_function_cache ();
661 /* Check to see if the current_source_symtab belongs to this objfile,
662 and if so, call clear_current_source_symtab_and_line. */
665 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
667 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
668 clear_current_source_symtab_and_line ();
671 /* Free the obstacks for non-reusable objfiles. */
672 obstack_free (&objfile_obstack
, 0);
674 /* Rebuild section map next time we need it. */
675 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
678 /* Free all the object files at once and clean up their users. */
681 free_all_objfiles (void)
685 /* Any objfile reference would become stale. */
686 for (so
= master_so_list (); so
; so
= so
->next
)
687 gdb_assert (so
->objfile
== NULL
);
689 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
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 SET_SYMBOL_VALUE_ADDRESS (sym
,
712 SYMBOL_VALUE_ADDRESS (sym
)
713 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
717 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
718 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
719 Return non-zero iff any change happened. */
722 objfile_relocate1 (struct objfile
*objfile
,
723 const struct section_offsets
*new_offsets
)
725 struct section_offsets
*delta
=
726 ((struct section_offsets
*)
727 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
729 int something_changed
= 0;
731 for (int 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. */
743 for (compunit_symtab
*cust
: objfile
->compunits ())
745 for (symtab
*s
: compunit_filetabs (cust
))
749 /* First the line table. */
750 l
= SYMTAB_LINETABLE (s
);
753 for (int i
= 0; i
< l
->nitems
; ++i
)
754 l
->item
[i
].pc
+= ANOFFSET (delta
,
755 COMPUNIT_BLOCK_LINE_SECTION
761 for (compunit_symtab
*cust
: objfile
->compunits ())
763 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
764 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
766 if (BLOCKVECTOR_MAP (bv
))
767 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
768 ANOFFSET (delta
, block_line_section
));
770 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
774 struct mdict_iterator miter
;
776 b
= BLOCKVECTOR_BLOCK (bv
, i
);
777 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
778 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
780 if (BLOCK_RANGES (b
) != nullptr)
781 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
783 BLOCK_RANGE_START (b
, j
)
784 += ANOFFSET (delta
, block_line_section
);
785 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
789 /* We only want to iterate over the local symbols, not any
790 symbols in included symtabs. */
791 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
793 relocate_one_symbol (sym
, objfile
, delta
);
799 /* This stores relocated addresses and so must be cleared. This
800 will cause it to be recreated on demand. */
801 objfile
->psymbol_map
.clear ();
803 /* Relocate isolated symbols. */
807 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
808 relocate_one_symbol (iter
, objfile
, delta
);
814 for (i
= 0; i
< objfile
->num_sections
; ++i
)
815 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
818 /* Rebuild section map next time we need it. */
819 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
821 /* Update the table in exec_ops, used to read memory. */
822 struct obj_section
*s
;
823 ALL_OBJFILE_OSECTIONS (objfile
, s
)
825 int idx
= s
- objfile
->sections
;
827 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
828 obj_section_addr (s
));
835 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
836 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
838 The number and ordering of sections does differ between the two objfiles.
839 Only their names match. Also the file offsets will differ (objfile being
840 possibly prelinked but separate_debug_objfile is probably not prelinked) but
841 the in-memory absolute address as specified by NEW_OFFSETS must match both
845 objfile_relocate (struct objfile
*objfile
,
846 const struct section_offsets
*new_offsets
)
850 changed
|= objfile_relocate1 (objfile
, new_offsets
);
852 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
854 if (debug_objfile
== objfile
)
857 section_addr_info objfile_addrs
858 = build_section_addr_info_from_objfile (objfile
);
860 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
861 relative ones must be already created according to debug_objfile. */
863 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
865 gdb_assert (debug_objfile
->num_sections
866 == gdb_bfd_count_sections (debug_objfile
->obfd
));
867 std::vector
<struct section_offsets
>
868 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
869 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
870 debug_objfile
->num_sections
,
873 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
876 /* Relocate breakpoints as necessary, after things are relocated. */
878 breakpoint_re_set ();
881 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
883 Return non-zero iff any change happened. */
886 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
888 struct section_offsets
*new_offsets
=
889 ((struct section_offsets
*)
890 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
893 for (i
= 0; i
< objfile
->num_sections
; ++i
)
894 new_offsets
->offsets
[i
] = slide
;
896 return objfile_relocate1 (objfile
, new_offsets
);
899 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
900 SEPARATE_DEBUG_OBJFILEs. */
903 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
907 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
908 changed
|= objfile_rebase1 (debug_objfile
, slide
);
910 /* Relocate breakpoints as necessary, after things are relocated. */
912 breakpoint_re_set ();
915 /* Return non-zero if OBJFILE has partial symbols. */
918 objfile_has_partial_symbols (struct objfile
*objfile
)
923 /* If we have not read psymbols, but we have a function capable of reading
924 them, then that is an indication that they are in fact available. Without
925 this function the symbols may have been already read in but they also may
926 not be present in this objfile. */
927 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
928 && objfile
->sf
->sym_read_psymbols
!= NULL
)
931 return objfile
->sf
->qf
->has_symbols (objfile
);
934 /* Return non-zero if OBJFILE has full symbols. */
937 objfile_has_full_symbols (struct objfile
*objfile
)
939 return objfile
->compunit_symtabs
!= NULL
;
942 /* Return non-zero if OBJFILE has full or partial symbols, either directly
943 or through a separate debug file. */
946 objfile_has_symbols (struct objfile
*objfile
)
948 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
949 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
955 /* Many places in gdb want to test just to see if we have any partial
956 symbols available. This function returns zero if none are currently
957 available, nonzero otherwise. */
960 have_partial_symbols (void)
962 for (objfile
*ofp
: current_program_space
->objfiles ())
964 if (objfile_has_partial_symbols (ofp
))
970 /* Many places in gdb want to test just to see if we have any full
971 symbols available. This function returns zero if none are currently
972 available, nonzero otherwise. */
975 have_full_symbols (void)
977 for (objfile
*ofp
: current_program_space
->objfiles ())
979 if (objfile_has_full_symbols (ofp
))
986 /* This operations deletes all objfile entries that represent solibs that
987 weren't explicitly loaded by the user, via e.g., the add-symbol-file
991 objfile_purge_solibs (void)
993 for (objfile
*objf
: current_program_space
->objfiles_safe ())
995 /* We assume that the solib package has been purged already, or will
998 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1004 /* Many places in gdb want to test just to see if we have any minimal
1005 symbols available. This function returns zero if none are currently
1006 available, nonzero otherwise. */
1009 have_minimal_symbols (void)
1011 for (objfile
*ofp
: current_program_space
->objfiles ())
1013 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
1021 /* Qsort comparison function. */
1024 sort_cmp (const struct obj_section
*sect1
, const obj_section
*sect2
)
1026 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1027 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1029 if (sect1_addr
< sect2_addr
)
1031 else if (sect1_addr
> sect2_addr
)
1035 /* Sections are at the same address. This could happen if
1036 A) we have an objfile and a separate debuginfo.
1037 B) we are confused, and have added sections without proper relocation,
1038 or something like that. */
1040 const struct objfile
*const objfile1
= sect1
->objfile
;
1041 const struct objfile
*const objfile2
= sect2
->objfile
;
1043 if (objfile1
->separate_debug_objfile
== objfile2
1044 || objfile2
->separate_debug_objfile
== objfile1
)
1046 /* Case A. The ordering doesn't matter: separate debuginfo files
1047 will be filtered out later. */
1052 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1053 triage. This section could be slow (since we iterate over all
1054 objfiles in each call to sort_cmp), but this shouldn't happen
1055 very often (GDB is already in a confused state; one hopes this
1056 doesn't happen at all). If you discover that significant time is
1057 spent in the loops below, do 'set complaints 100' and examine the
1058 resulting complaints. */
1059 if (objfile1
== objfile2
)
1061 /* Both sections came from the same objfile. We are really
1062 confused. Sort on sequence order of sections within the
1063 objfile. The order of checks is important here, if we find a
1064 match on SECT2 first then either SECT2 is before SECT1, or,
1065 SECT2 == SECT1, in both cases we should return false. The
1066 second case shouldn't occur during normal use, but std::sort
1067 does check that '!(a < a)' when compiled in debug mode. */
1069 const struct obj_section
*osect
;
1071 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1074 else if (osect
== sect1
)
1077 /* We should have found one of the sections before getting here. */
1078 gdb_assert_not_reached ("section not found");
1082 /* Sort on sequence number of the objfile in the chain. */
1084 for (objfile
*objfile
: current_program_space
->objfiles ())
1085 if (objfile
== objfile1
)
1087 else if (objfile
== objfile2
)
1090 /* We should have found one of the objfiles before getting here. */
1091 gdb_assert_not_reached ("objfile not found");
1096 gdb_assert_not_reached ("unexpected code path");
1100 /* Select "better" obj_section to keep. We prefer the one that came from
1101 the real object, rather than the one from separate debuginfo.
1102 Most of the time the two sections are exactly identical, but with
1103 prelinking the .rel.dyn section in the real object may have different
1106 static struct obj_section
*
1107 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1109 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1110 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1111 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1112 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1113 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1115 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1120 /* Return 1 if SECTION should be inserted into the section map.
1121 We want to insert only non-overlay and non-TLS section. */
1124 insert_section_p (const struct bfd
*abfd
,
1125 const struct bfd_section
*section
)
1127 const bfd_vma lma
= bfd_section_lma (section
);
1129 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1130 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1131 /* This is an overlay section. IN_MEMORY check is needed to avoid
1132 discarding sections from the "system supplied DSO" (aka vdso)
1133 on some Linux systems (e.g. Fedora 11). */
1135 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1136 /* This is a TLS section. */
1142 /* Filter out overlapping sections where one section came from the real
1143 objfile, and the other from a separate debuginfo file.
1144 Return the size of table after redundant sections have been eliminated. */
1147 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1151 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1153 struct obj_section
*const sect1
= map
[i
];
1154 struct obj_section
*const sect2
= map
[i
+ 1];
1155 const struct objfile
*const objfile1
= sect1
->objfile
;
1156 const struct objfile
*const objfile2
= sect2
->objfile
;
1157 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1158 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1160 if (sect1_addr
== sect2_addr
1161 && (objfile1
->separate_debug_objfile
== objfile2
1162 || objfile2
->separate_debug_objfile
== objfile1
))
1164 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1173 gdb_assert (i
== map_size
- 1);
1177 /* The map should not have shrunk to less than half the original size. */
1178 gdb_assert (map_size
/ 2 <= j
);
1183 /* Filter out overlapping sections, issuing a warning if any are found.
1184 Overlapping sections could really be overlay sections which we didn't
1185 classify as such in insert_section_p, or we could be dealing with a
1189 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1193 for (i
= 0, j
= 0; i
< map_size
- 1; )
1198 for (k
= i
+ 1; k
< map_size
; k
++)
1200 struct obj_section
*const sect1
= map
[i
];
1201 struct obj_section
*const sect2
= map
[k
];
1202 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1203 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1204 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1206 gdb_assert (sect1_addr
<= sect2_addr
);
1208 if (sect1_endaddr
<= sect2_addr
)
1212 /* We have an overlap. Report it. */
1214 struct objfile
*const objf1
= sect1
->objfile
;
1215 struct objfile
*const objf2
= sect2
->objfile
;
1217 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1218 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1220 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1222 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1224 complaint (_("unexpected overlap between:\n"
1225 " (A) section `%s' from `%s' [%s, %s)\n"
1226 " (B) section `%s' from `%s' [%s, %s).\n"
1227 "Will ignore section B"),
1228 bfd_section_name (bfds1
), objfile_name (objf1
),
1229 paddress (gdbarch
, sect1_addr
),
1230 paddress (gdbarch
, sect1_endaddr
),
1231 bfd_section_name (bfds2
), objfile_name (objf2
),
1232 paddress (gdbarch
, sect2_addr
),
1233 paddress (gdbarch
, sect2_endaddr
));
1241 gdb_assert (i
== map_size
- 1);
1249 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1250 TLS, overlay and overlapping sections. */
1253 update_section_map (struct program_space
*pspace
,
1254 struct obj_section
***pmap
, int *pmap_size
)
1256 struct objfile_pspace_info
*pspace_info
;
1257 int alloc_size
, map_size
, i
;
1258 struct obj_section
*s
, **map
;
1260 pspace_info
= get_objfile_pspace_data (pspace
);
1261 gdb_assert (pspace_info
->section_map_dirty
!= 0
1262 || pspace_info
->new_objfiles_available
!= 0);
1268 for (objfile
*objfile
: pspace
->objfiles ())
1269 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1270 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1273 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1274 if (alloc_size
== 0)
1281 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1284 for (objfile
*objfile
: pspace
->objfiles ())
1285 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1286 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1289 std::sort (map
, map
+ alloc_size
, sort_cmp
);
1290 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1291 map_size
= filter_overlapping_sections(map
, map_size
);
1293 if (map_size
< alloc_size
)
1294 /* Some sections were eliminated. Trim excess space. */
1295 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1297 gdb_assert (alloc_size
== map_size
);
1300 *pmap_size
= map_size
;
1303 /* Bsearch comparison function. */
1306 bsearch_cmp (const void *key
, const void *elt
)
1308 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1309 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1311 if (pc
< obj_section_addr (section
))
1313 if (pc
< obj_section_endaddr (section
))
1318 /* Returns a section whose range includes PC or NULL if none found. */
1320 struct obj_section
*
1321 find_pc_section (CORE_ADDR pc
)
1323 struct objfile_pspace_info
*pspace_info
;
1324 struct obj_section
*s
, **sp
;
1326 /* Check for mapped overlay section first. */
1327 s
= find_pc_mapped_section (pc
);
1331 pspace_info
= get_objfile_pspace_data (current_program_space
);
1332 if (pspace_info
->section_map_dirty
1333 || (pspace_info
->new_objfiles_available
1334 && !pspace_info
->inhibit_updates
))
1336 update_section_map (current_program_space
,
1337 &pspace_info
->sections
,
1338 &pspace_info
->num_sections
);
1340 /* Don't need updates to section map until objfiles are added,
1341 removed or relocated. */
1342 pspace_info
->new_objfiles_available
= 0;
1343 pspace_info
->section_map_dirty
= 0;
1346 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1347 bsearch be non-NULL. */
1348 if (pspace_info
->sections
== NULL
)
1350 gdb_assert (pspace_info
->num_sections
== 0);
1354 sp
= (struct obj_section
**) bsearch (&pc
,
1355 pspace_info
->sections
,
1356 pspace_info
->num_sections
,
1357 sizeof (*pspace_info
->sections
),
1365 /* Return non-zero if PC is in a section called NAME. */
1368 pc_in_section (CORE_ADDR pc
, const char *name
)
1370 struct obj_section
*s
;
1373 s
= find_pc_section (pc
);
1376 && s
->the_bfd_section
->name
!= NULL
1377 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1382 /* Set section_map_dirty so section map will be rebuilt next time it
1383 is used. Called by reread_symbols. */
1386 objfiles_changed (void)
1388 /* Rebuild section map next time we need it. */
1389 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1392 /* See comments in objfiles.h. */
1394 scoped_restore_tmpl
<int>
1395 inhibit_section_map_updates (struct program_space
*pspace
)
1397 return scoped_restore_tmpl
<int>
1398 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1401 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1405 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1407 struct obj_section
*osect
;
1409 if (objfile
== NULL
)
1412 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1414 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1417 if (obj_section_addr (osect
) <= addr
1418 && addr
< obj_section_endaddr (osect
))
1425 shared_objfile_contains_address_p (struct program_space
*pspace
,
1428 for (objfile
*objfile
: pspace
->objfiles ())
1430 if ((objfile
->flags
& OBJF_SHARED
) != 0
1431 && is_addr_in_objfile (address
, objfile
))
1438 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1439 gdbarch method. It is equivalent to use the objfiles iterable,
1440 searching the objfiles in the order they are stored internally,
1441 ignoring CURRENT_OBJFILE.
1443 On most platforms, it should be close enough to doing the best
1444 we can without some knowledge specific to the architecture. */
1447 default_iterate_over_objfiles_in_search_order
1448 (struct gdbarch
*gdbarch
,
1449 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1450 void *cb_data
, struct objfile
*current_objfile
)
1454 for (objfile
*objfile
: current_program_space
->objfiles ())
1456 stop
= cb (objfile
, cb_data
);
1462 /* See objfiles.h. */
1465 objfile_name (const struct objfile
*objfile
)
1467 if (objfile
->obfd
!= NULL
)
1468 return bfd_get_filename (objfile
->obfd
);
1470 return objfile
->original_name
;
1473 /* See objfiles.h. */
1476 objfile_filename (const struct objfile
*objfile
)
1478 if (objfile
->obfd
!= NULL
)
1479 return bfd_get_filename (objfile
->obfd
);
1484 /* See objfiles.h. */
1487 objfile_debug_name (const struct objfile
*objfile
)
1489 return lbasename (objfile
->original_name
);
1492 /* See objfiles.h. */
1495 objfile_flavour_name (struct objfile
*objfile
)
1497 if (objfile
->obfd
!= NULL
)
1498 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));