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
);
376 /* Retrieve the gdbarch associated with OBJFILE. */
379 get_objfile_arch (const struct objfile
*objfile
)
381 return objfile
->per_bfd
->gdbarch
;
384 /* If there is a valid and known entry point, function fills *ENTRY_P with it
385 and returns non-zero; otherwise it returns zero. */
388 entry_point_address_query (CORE_ADDR
*entry_p
)
390 if (symfile_objfile
== NULL
|| !symfile_objfile
->per_bfd
->ei
.entry_point_p
)
393 *entry_p
= (symfile_objfile
->per_bfd
->ei
.entry_point
394 + ANOFFSET (symfile_objfile
->section_offsets
,
395 symfile_objfile
->per_bfd
->ei
.the_bfd_section_index
));
400 /* Get current entry point address. Call error if it is not known. */
403 entry_point_address (void)
407 if (!entry_point_address_query (&retval
))
408 error (_("Entry point address is not known."));
413 separate_debug_iterator
&
414 separate_debug_iterator::operator++ ()
416 gdb_assert (m_objfile
!= nullptr);
420 /* If any, return the first child. */
421 res
= m_objfile
->separate_debug_objfile
;
428 /* Common case where there is no separate debug objfile. */
429 if (m_objfile
== m_parent
)
435 /* Return the brother if any. Note that we don't iterate on brothers of
437 res
= m_objfile
->separate_debug_objfile_link
;
444 for (res
= m_objfile
->separate_debug_objfile_backlink
;
446 res
= res
->separate_debug_objfile_backlink
)
448 gdb_assert (res
!= nullptr);
449 if (res
->separate_debug_objfile_link
!= nullptr)
451 m_objfile
= res
->separate_debug_objfile_link
;
459 /* Unlink OBJFILE from the list of known objfiles. */
462 unlink_objfile (struct objfile
*objfile
)
464 struct objfile
**objpp
;
466 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
468 if (*objpp
== objfile
)
470 *objpp
= (*objpp
)->next
;
471 objfile
->next
= NULL
;
476 internal_error (__FILE__
, __LINE__
,
477 _("unlink_objfile: objfile already unlinked"));
480 /* Add OBJFILE as a separate debug objfile of PARENT. */
483 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
485 gdb_assert (objfile
&& parent
);
487 /* Must not be already in a list. */
488 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
489 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
490 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
491 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
492 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
494 objfile
->separate_debug_objfile_backlink
= parent
;
495 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
496 parent
->separate_debug_objfile
= objfile
;
499 /* See objfiles.h. */
502 objfile::make (bfd
*bfd_
, const char *name_
, objfile_flags flags_
,
505 objfile
*result
= new objfile (bfd_
, name_
, flags_
);
506 if (parent
!= nullptr)
507 add_separate_debug_objfile (result
, parent
);
509 current_program_space
->add_objfile (result
, parent
);
511 /* Rebuild section map next time we need it. */
512 get_objfile_pspace_data (current_program_space
)->new_objfiles_available
= 1;
517 /* See objfiles.h. */
525 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
529 free_objfile_separate_debug (struct objfile
*objfile
)
531 struct objfile
*child
;
533 for (child
= objfile
->separate_debug_objfile
; child
;)
535 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
541 /* Destroy an objfile and all the symtabs and psymtabs under it. */
545 /* First notify observers that this objfile is about to be freed. */
546 gdb::observers::free_objfile
.notify (this);
548 /* Free all separate debug objfiles. */
549 free_objfile_separate_debug (this);
551 if (separate_debug_objfile_backlink
)
553 /* We freed the separate debug file, make sure the base objfile
554 doesn't reference it. */
555 struct objfile
*child
;
557 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
561 /* THIS is the first child. */
562 separate_debug_objfile_backlink
->separate_debug_objfile
=
563 separate_debug_objfile_link
;
567 /* Find THIS in the list. */
570 if (child
->separate_debug_objfile_link
== this)
572 child
->separate_debug_objfile_link
=
573 separate_debug_objfile_link
;
576 child
= child
->separate_debug_objfile_link
;
582 /* Remove any references to this objfile in the global value
584 preserve_values (this);
586 /* It still may reference data modules have associated with the objfile and
587 the symbol file data. */
588 forget_cached_source_info_for_objfile (this);
590 breakpoint_free_objfile (this);
591 btrace_free_objfile (this);
593 /* First do any symbol file specific actions required when we are
594 finished with a particular symbol file. Note that if the objfile
595 is using reusable symbol information (via mmalloc) then each of
596 these routines is responsible for doing the correct thing, either
597 freeing things which are valid only during this particular gdb
598 execution, or leaving them to be reused during the next one. */
601 (*sf
->sym_finish
) (this);
603 /* Discard any data modules have associated with the objfile. The function
604 still may reference obfd. */
605 objfile_free_data (this);
608 gdb_bfd_unref (obfd
);
612 /* Remove it from the chain of all objfiles. */
614 unlink_objfile (this);
616 if (this == symfile_objfile
)
617 symfile_objfile
= NULL
;
619 /* Before the symbol table code was redone to make it easier to
620 selectively load and remove information particular to a specific
621 linkage unit, gdb used to do these things whenever the monolithic
622 symbol table was blown away. How much still needs to be done
623 is unknown, but we play it safe for now and keep each action until
624 it is shown to be no longer needed. */
626 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
627 for example), so we need to call this here. */
628 clear_pc_function_cache ();
630 /* Check to see if the current_source_symtab belongs to this objfile,
631 and if so, call clear_current_source_symtab_and_line. */
634 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
636 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
637 clear_current_source_symtab_and_line ();
640 /* Free the obstacks for non-reusable objfiles. */
641 obstack_free (&objfile_obstack
, 0);
643 /* Rebuild section map next time we need it. */
644 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
647 /* Free all the object files at once and clean up their users. */
650 free_all_objfiles (void)
654 /* Any objfile reference would become stale. */
655 for (so
= master_so_list (); so
; so
= so
->next
)
656 gdb_assert (so
->objfile
== NULL
);
658 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
660 clear_symtab_users (0);
663 /* A helper function for objfile_relocate1 that relocates a single
667 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
668 struct section_offsets
*delta
)
670 fixup_symbol_section (sym
, objfile
);
672 /* The RS6000 code from which this was taken skipped
673 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
674 But I'm leaving out that test, on the theory that
675 they can't possibly pass the tests below. */
676 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
677 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
678 && SYMBOL_SECTION (sym
) >= 0)
680 SET_SYMBOL_VALUE_ADDRESS (sym
,
681 SYMBOL_VALUE_ADDRESS (sym
)
682 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
686 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
687 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
688 Return non-zero iff any change happened. */
691 objfile_relocate1 (struct objfile
*objfile
,
692 const struct section_offsets
*new_offsets
)
694 struct section_offsets
*delta
=
695 ((struct section_offsets
*)
696 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
698 int something_changed
= 0;
700 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
703 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
704 if (ANOFFSET (delta
, i
) != 0)
705 something_changed
= 1;
707 if (!something_changed
)
710 /* OK, get all the symtabs. */
712 for (compunit_symtab
*cust
: objfile
->compunits ())
714 for (symtab
*s
: compunit_filetabs (cust
))
718 /* First the line table. */
719 l
= SYMTAB_LINETABLE (s
);
722 for (int i
= 0; i
< l
->nitems
; ++i
)
723 l
->item
[i
].pc
+= ANOFFSET (delta
,
724 COMPUNIT_BLOCK_LINE_SECTION
730 for (compunit_symtab
*cust
: objfile
->compunits ())
732 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
733 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
735 if (BLOCKVECTOR_MAP (bv
))
736 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
737 ANOFFSET (delta
, block_line_section
));
739 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
743 struct mdict_iterator miter
;
745 b
= BLOCKVECTOR_BLOCK (bv
, i
);
746 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
747 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
749 if (BLOCK_RANGES (b
) != nullptr)
750 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
752 BLOCK_RANGE_START (b
, j
)
753 += ANOFFSET (delta
, block_line_section
);
754 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
758 /* We only want to iterate over the local symbols, not any
759 symbols in included symtabs. */
760 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
762 relocate_one_symbol (sym
, objfile
, delta
);
768 /* This stores relocated addresses and so must be cleared. This
769 will cause it to be recreated on demand. */
770 objfile
->psymbol_map
.clear ();
772 /* Relocate isolated symbols. */
776 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
777 relocate_one_symbol (iter
, objfile
, delta
);
783 for (i
= 0; i
< objfile
->num_sections
; ++i
)
784 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
787 /* Rebuild section map next time we need it. */
788 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
790 /* Update the table in exec_ops, used to read memory. */
791 struct obj_section
*s
;
792 ALL_OBJFILE_OSECTIONS (objfile
, s
)
794 int idx
= s
- objfile
->sections
;
796 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
797 obj_section_addr (s
));
804 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
805 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
807 The number and ordering of sections does differ between the two objfiles.
808 Only their names match. Also the file offsets will differ (objfile being
809 possibly prelinked but separate_debug_objfile is probably not prelinked) but
810 the in-memory absolute address as specified by NEW_OFFSETS must match both
814 objfile_relocate (struct objfile
*objfile
,
815 const struct section_offsets
*new_offsets
)
819 changed
|= objfile_relocate1 (objfile
, new_offsets
);
821 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
823 if (debug_objfile
== objfile
)
826 section_addr_info objfile_addrs
827 = build_section_addr_info_from_objfile (objfile
);
829 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
830 relative ones must be already created according to debug_objfile. */
832 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
834 gdb_assert (debug_objfile
->num_sections
835 == gdb_bfd_count_sections (debug_objfile
->obfd
));
836 std::vector
<struct section_offsets
>
837 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
838 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
839 debug_objfile
->num_sections
,
842 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
845 /* Relocate breakpoints as necessary, after things are relocated. */
847 breakpoint_re_set ();
850 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
852 Return non-zero iff any change happened. */
855 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
857 struct section_offsets
*new_offsets
=
858 ((struct section_offsets
*)
859 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
862 for (i
= 0; i
< objfile
->num_sections
; ++i
)
863 new_offsets
->offsets
[i
] = slide
;
865 return objfile_relocate1 (objfile
, new_offsets
);
868 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
869 SEPARATE_DEBUG_OBJFILEs. */
872 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
876 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
877 changed
|= objfile_rebase1 (debug_objfile
, slide
);
879 /* Relocate breakpoints as necessary, after things are relocated. */
881 breakpoint_re_set ();
884 /* Return non-zero if OBJFILE has partial symbols. */
887 objfile_has_partial_symbols (struct objfile
*objfile
)
892 /* If we have not read psymbols, but we have a function capable of reading
893 them, then that is an indication that they are in fact available. Without
894 this function the symbols may have been already read in but they also may
895 not be present in this objfile. */
896 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
897 && objfile
->sf
->sym_read_psymbols
!= NULL
)
900 return objfile
->sf
->qf
->has_symbols (objfile
);
903 /* Return non-zero if OBJFILE has full symbols. */
906 objfile_has_full_symbols (struct objfile
*objfile
)
908 return objfile
->compunit_symtabs
!= NULL
;
911 /* Return non-zero if OBJFILE has full or partial symbols, either directly
912 or through a separate debug file. */
915 objfile_has_symbols (struct objfile
*objfile
)
917 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
918 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
924 /* Many places in gdb want to test just to see if we have any partial
925 symbols available. This function returns zero if none are currently
926 available, nonzero otherwise. */
929 have_partial_symbols (void)
931 for (objfile
*ofp
: current_program_space
->objfiles ())
933 if (objfile_has_partial_symbols (ofp
))
939 /* Many places in gdb want to test just to see if we have any full
940 symbols available. This function returns zero if none are currently
941 available, nonzero otherwise. */
944 have_full_symbols (void)
946 for (objfile
*ofp
: current_program_space
->objfiles ())
948 if (objfile_has_full_symbols (ofp
))
955 /* This operations deletes all objfile entries that represent solibs that
956 weren't explicitly loaded by the user, via e.g., the add-symbol-file
960 objfile_purge_solibs (void)
962 for (objfile
*objf
: current_program_space
->objfiles_safe ())
964 /* We assume that the solib package has been purged already, or will
967 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
973 /* Many places in gdb want to test just to see if we have any minimal
974 symbols available. This function returns zero if none are currently
975 available, nonzero otherwise. */
978 have_minimal_symbols (void)
980 for (objfile
*ofp
: current_program_space
->objfiles ())
982 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
990 /* Qsort comparison function. */
993 sort_cmp (const struct obj_section
*sect1
, const obj_section
*sect2
)
995 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
996 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
998 if (sect1_addr
< sect2_addr
)
1000 else if (sect1_addr
> sect2_addr
)
1004 /* Sections are at the same address. This could happen if
1005 A) we have an objfile and a separate debuginfo.
1006 B) we are confused, and have added sections without proper relocation,
1007 or something like that. */
1009 const struct objfile
*const objfile1
= sect1
->objfile
;
1010 const struct objfile
*const objfile2
= sect2
->objfile
;
1012 if (objfile1
->separate_debug_objfile
== objfile2
1013 || objfile2
->separate_debug_objfile
== objfile1
)
1015 /* Case A. The ordering doesn't matter: separate debuginfo files
1016 will be filtered out later. */
1021 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1022 triage. This section could be slow (since we iterate over all
1023 objfiles in each call to sort_cmp), but this shouldn't happen
1024 very often (GDB is already in a confused state; one hopes this
1025 doesn't happen at all). If you discover that significant time is
1026 spent in the loops below, do 'set complaints 100' and examine the
1027 resulting complaints. */
1028 if (objfile1
== objfile2
)
1030 /* Both sections came from the same objfile. We are really
1031 confused. Sort on sequence order of sections within the
1032 objfile. The order of checks is important here, if we find a
1033 match on SECT2 first then either SECT2 is before SECT1, or,
1034 SECT2 == SECT1, in both cases we should return false. The
1035 second case shouldn't occur during normal use, but std::sort
1036 does check that '!(a < a)' when compiled in debug mode. */
1038 const struct obj_section
*osect
;
1040 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1043 else if (osect
== sect1
)
1046 /* We should have found one of the sections before getting here. */
1047 gdb_assert_not_reached ("section not found");
1051 /* Sort on sequence number of the objfile in the chain. */
1053 for (objfile
*objfile
: current_program_space
->objfiles ())
1054 if (objfile
== objfile1
)
1056 else if (objfile
== objfile2
)
1059 /* We should have found one of the objfiles before getting here. */
1060 gdb_assert_not_reached ("objfile not found");
1065 gdb_assert_not_reached ("unexpected code path");
1069 /* Select "better" obj_section to keep. We prefer the one that came from
1070 the real object, rather than the one from separate debuginfo.
1071 Most of the time the two sections are exactly identical, but with
1072 prelinking the .rel.dyn section in the real object may have different
1075 static struct obj_section
*
1076 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1078 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1079 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1080 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1081 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1082 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1084 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1089 /* Return 1 if SECTION should be inserted into the section map.
1090 We want to insert only non-overlay and non-TLS section. */
1093 insert_section_p (const struct bfd
*abfd
,
1094 const struct bfd_section
*section
)
1096 const bfd_vma lma
= bfd_section_lma (section
);
1098 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1099 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1100 /* This is an overlay section. IN_MEMORY check is needed to avoid
1101 discarding sections from the "system supplied DSO" (aka vdso)
1102 on some Linux systems (e.g. Fedora 11). */
1104 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1105 /* This is a TLS section. */
1111 /* Filter out overlapping sections where one section came from the real
1112 objfile, and the other from a separate debuginfo file.
1113 Return the size of table after redundant sections have been eliminated. */
1116 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1120 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1122 struct obj_section
*const sect1
= map
[i
];
1123 struct obj_section
*const sect2
= map
[i
+ 1];
1124 const struct objfile
*const objfile1
= sect1
->objfile
;
1125 const struct objfile
*const objfile2
= sect2
->objfile
;
1126 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1127 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1129 if (sect1_addr
== sect2_addr
1130 && (objfile1
->separate_debug_objfile
== objfile2
1131 || objfile2
->separate_debug_objfile
== objfile1
))
1133 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1142 gdb_assert (i
== map_size
- 1);
1146 /* The map should not have shrunk to less than half the original size. */
1147 gdb_assert (map_size
/ 2 <= j
);
1152 /* Filter out overlapping sections, issuing a warning if any are found.
1153 Overlapping sections could really be overlay sections which we didn't
1154 classify as such in insert_section_p, or we could be dealing with a
1158 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1162 for (i
= 0, j
= 0; i
< map_size
- 1; )
1167 for (k
= i
+ 1; k
< map_size
; k
++)
1169 struct obj_section
*const sect1
= map
[i
];
1170 struct obj_section
*const sect2
= map
[k
];
1171 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1172 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1173 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1175 gdb_assert (sect1_addr
<= sect2_addr
);
1177 if (sect1_endaddr
<= sect2_addr
)
1181 /* We have an overlap. Report it. */
1183 struct objfile
*const objf1
= sect1
->objfile
;
1184 struct objfile
*const objf2
= sect2
->objfile
;
1186 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1187 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1189 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1191 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1193 complaint (_("unexpected overlap between:\n"
1194 " (A) section `%s' from `%s' [%s, %s)\n"
1195 " (B) section `%s' from `%s' [%s, %s).\n"
1196 "Will ignore section B"),
1197 bfd_section_name (bfds1
), objfile_name (objf1
),
1198 paddress (gdbarch
, sect1_addr
),
1199 paddress (gdbarch
, sect1_endaddr
),
1200 bfd_section_name (bfds2
), objfile_name (objf2
),
1201 paddress (gdbarch
, sect2_addr
),
1202 paddress (gdbarch
, sect2_endaddr
));
1210 gdb_assert (i
== map_size
- 1);
1218 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1219 TLS, overlay and overlapping sections. */
1222 update_section_map (struct program_space
*pspace
,
1223 struct obj_section
***pmap
, int *pmap_size
)
1225 struct objfile_pspace_info
*pspace_info
;
1226 int alloc_size
, map_size
, i
;
1227 struct obj_section
*s
, **map
;
1229 pspace_info
= get_objfile_pspace_data (pspace
);
1230 gdb_assert (pspace_info
->section_map_dirty
!= 0
1231 || pspace_info
->new_objfiles_available
!= 0);
1237 for (objfile
*objfile
: pspace
->objfiles ())
1238 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1239 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1242 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1243 if (alloc_size
== 0)
1250 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1253 for (objfile
*objfile
: pspace
->objfiles ())
1254 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1255 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1258 std::sort (map
, map
+ alloc_size
, sort_cmp
);
1259 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1260 map_size
= filter_overlapping_sections(map
, map_size
);
1262 if (map_size
< alloc_size
)
1263 /* Some sections were eliminated. Trim excess space. */
1264 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1266 gdb_assert (alloc_size
== map_size
);
1269 *pmap_size
= map_size
;
1272 /* Bsearch comparison function. */
1275 bsearch_cmp (const void *key
, const void *elt
)
1277 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1278 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1280 if (pc
< obj_section_addr (section
))
1282 if (pc
< obj_section_endaddr (section
))
1287 /* Returns a section whose range includes PC or NULL if none found. */
1289 struct obj_section
*
1290 find_pc_section (CORE_ADDR pc
)
1292 struct objfile_pspace_info
*pspace_info
;
1293 struct obj_section
*s
, **sp
;
1295 /* Check for mapped overlay section first. */
1296 s
= find_pc_mapped_section (pc
);
1300 pspace_info
= get_objfile_pspace_data (current_program_space
);
1301 if (pspace_info
->section_map_dirty
1302 || (pspace_info
->new_objfiles_available
1303 && !pspace_info
->inhibit_updates
))
1305 update_section_map (current_program_space
,
1306 &pspace_info
->sections
,
1307 &pspace_info
->num_sections
);
1309 /* Don't need updates to section map until objfiles are added,
1310 removed or relocated. */
1311 pspace_info
->new_objfiles_available
= 0;
1312 pspace_info
->section_map_dirty
= 0;
1315 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1316 bsearch be non-NULL. */
1317 if (pspace_info
->sections
== NULL
)
1319 gdb_assert (pspace_info
->num_sections
== 0);
1323 sp
= (struct obj_section
**) bsearch (&pc
,
1324 pspace_info
->sections
,
1325 pspace_info
->num_sections
,
1326 sizeof (*pspace_info
->sections
),
1334 /* Return non-zero if PC is in a section called NAME. */
1337 pc_in_section (CORE_ADDR pc
, const char *name
)
1339 struct obj_section
*s
;
1342 s
= find_pc_section (pc
);
1345 && s
->the_bfd_section
->name
!= NULL
1346 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1351 /* Set section_map_dirty so section map will be rebuilt next time it
1352 is used. Called by reread_symbols. */
1355 objfiles_changed (void)
1357 /* Rebuild section map next time we need it. */
1358 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1361 /* See comments in objfiles.h. */
1363 scoped_restore_tmpl
<int>
1364 inhibit_section_map_updates (struct program_space
*pspace
)
1366 return scoped_restore_tmpl
<int>
1367 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1370 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1374 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1376 struct obj_section
*osect
;
1378 if (objfile
== NULL
)
1381 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1383 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1386 if (obj_section_addr (osect
) <= addr
1387 && addr
< obj_section_endaddr (osect
))
1394 shared_objfile_contains_address_p (struct program_space
*pspace
,
1397 for (objfile
*objfile
: pspace
->objfiles ())
1399 if ((objfile
->flags
& OBJF_SHARED
) != 0
1400 && is_addr_in_objfile (address
, objfile
))
1407 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1408 gdbarch method. It is equivalent to use the objfiles iterable,
1409 searching the objfiles in the order they are stored internally,
1410 ignoring CURRENT_OBJFILE.
1412 On most platforms, it should be close enough to doing the best
1413 we can without some knowledge specific to the architecture. */
1416 default_iterate_over_objfiles_in_search_order
1417 (struct gdbarch
*gdbarch
,
1418 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1419 void *cb_data
, struct objfile
*current_objfile
)
1423 for (objfile
*objfile
: current_program_space
->objfiles ())
1425 stop
= cb (objfile
, cb_data
);
1431 /* See objfiles.h. */
1434 objfile_name (const struct objfile
*objfile
)
1436 if (objfile
->obfd
!= NULL
)
1437 return bfd_get_filename (objfile
->obfd
);
1439 return objfile
->original_name
;
1442 /* See objfiles.h. */
1445 objfile_filename (const struct objfile
*objfile
)
1447 if (objfile
->obfd
!= NULL
)
1448 return bfd_get_filename (objfile
->obfd
);
1453 /* See objfiles.h. */
1456 objfile_debug_name (const struct objfile
*objfile
)
1458 return lbasename (objfile
->original_name
);
1461 /* See objfiles.h. */
1464 objfile_flavour_name (struct objfile
*objfile
)
1466 if (objfile
->obfd
!= NULL
)
1467 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));