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 /* Add OBJFILE as a separate debug objfile of PARENT. */
462 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
464 gdb_assert (objfile
&& parent
);
466 /* Must not be already in a list. */
467 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
468 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
469 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
470 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
471 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
473 objfile
->separate_debug_objfile_backlink
= parent
;
474 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
475 parent
->separate_debug_objfile
= objfile
;
478 /* See objfiles.h. */
481 objfile::make (bfd
*bfd_
, const char *name_
, objfile_flags flags_
,
484 objfile
*result
= new objfile (bfd_
, name_
, flags_
);
485 if (parent
!= nullptr)
486 add_separate_debug_objfile (result
, parent
);
488 current_program_space
->add_objfile (result
, parent
);
490 /* Rebuild section map next time we need it. */
491 get_objfile_pspace_data (current_program_space
)->new_objfiles_available
= 1;
496 /* See objfiles.h. */
501 current_program_space
->remove_objfile (this);
505 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
509 free_objfile_separate_debug (struct objfile
*objfile
)
511 struct objfile
*child
;
513 for (child
= objfile
->separate_debug_objfile
; child
;)
515 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
521 /* Destroy an objfile and all the symtabs and psymtabs under it. */
525 /* First notify observers that this objfile is about to be freed. */
526 gdb::observers::free_objfile
.notify (this);
528 /* Free all separate debug objfiles. */
529 free_objfile_separate_debug (this);
531 if (separate_debug_objfile_backlink
)
533 /* We freed the separate debug file, make sure the base objfile
534 doesn't reference it. */
535 struct objfile
*child
;
537 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
541 /* THIS is the first child. */
542 separate_debug_objfile_backlink
->separate_debug_objfile
=
543 separate_debug_objfile_link
;
547 /* Find THIS in the list. */
550 if (child
->separate_debug_objfile_link
== this)
552 child
->separate_debug_objfile_link
=
553 separate_debug_objfile_link
;
556 child
= child
->separate_debug_objfile_link
;
562 /* Remove any references to this objfile in the global value
564 preserve_values (this);
566 /* It still may reference data modules have associated with the objfile and
567 the symbol file data. */
568 forget_cached_source_info_for_objfile (this);
570 breakpoint_free_objfile (this);
571 btrace_free_objfile (this);
573 /* First do any symbol file specific actions required when we are
574 finished with a particular symbol file. Note that if the objfile
575 is using reusable symbol information (via mmalloc) then each of
576 these routines is responsible for doing the correct thing, either
577 freeing things which are valid only during this particular gdb
578 execution, or leaving them to be reused during the next one. */
581 (*sf
->sym_finish
) (this);
583 /* Discard any data modules have associated with the objfile. The function
584 still may reference obfd. */
585 objfile_free_data (this);
588 gdb_bfd_unref (obfd
);
592 /* Before the symbol table code was redone to make it easier to
593 selectively load and remove information particular to a specific
594 linkage unit, gdb used to do these things whenever the monolithic
595 symbol table was blown away. How much still needs to be done
596 is unknown, but we play it safe for now and keep each action until
597 it is shown to be no longer needed. */
599 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
600 for example), so we need to call this here. */
601 clear_pc_function_cache ();
603 /* Check to see if the current_source_symtab belongs to this objfile,
604 and if so, call clear_current_source_symtab_and_line. */
607 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
609 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
610 clear_current_source_symtab_and_line ();
613 /* Free the obstacks for non-reusable objfiles. */
614 obstack_free (&objfile_obstack
, 0);
616 /* Rebuild section map next time we need it. */
617 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
620 /* Free all the object files at once and clean up their users. */
623 free_all_objfiles (void)
627 /* Any objfile reference would become stale. */
628 for (so
= master_so_list (); so
; so
= so
->next
)
629 gdb_assert (so
->objfile
== NULL
);
631 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
633 clear_symtab_users (0);
636 /* A helper function for objfile_relocate1 that relocates a single
640 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
641 struct section_offsets
*delta
)
643 fixup_symbol_section (sym
, objfile
);
645 /* The RS6000 code from which this was taken skipped
646 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
647 But I'm leaving out that test, on the theory that
648 they can't possibly pass the tests below. */
649 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
650 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
651 && SYMBOL_SECTION (sym
) >= 0)
653 SET_SYMBOL_VALUE_ADDRESS (sym
,
654 SYMBOL_VALUE_ADDRESS (sym
)
655 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
659 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
660 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
661 Return non-zero iff any change happened. */
664 objfile_relocate1 (struct objfile
*objfile
,
665 const struct section_offsets
*new_offsets
)
667 struct section_offsets
*delta
=
668 ((struct section_offsets
*)
669 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
671 int something_changed
= 0;
673 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
676 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
677 if (ANOFFSET (delta
, i
) != 0)
678 something_changed
= 1;
680 if (!something_changed
)
683 /* OK, get all the symtabs. */
685 for (compunit_symtab
*cust
: objfile
->compunits ())
687 for (symtab
*s
: compunit_filetabs (cust
))
691 /* First the line table. */
692 l
= SYMTAB_LINETABLE (s
);
695 for (int i
= 0; i
< l
->nitems
; ++i
)
696 l
->item
[i
].pc
+= ANOFFSET (delta
,
697 COMPUNIT_BLOCK_LINE_SECTION
703 for (compunit_symtab
*cust
: objfile
->compunits ())
705 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
706 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
708 if (BLOCKVECTOR_MAP (bv
))
709 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
710 ANOFFSET (delta
, block_line_section
));
712 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
716 struct mdict_iterator miter
;
718 b
= BLOCKVECTOR_BLOCK (bv
, i
);
719 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
720 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
722 if (BLOCK_RANGES (b
) != nullptr)
723 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
725 BLOCK_RANGE_START (b
, j
)
726 += ANOFFSET (delta
, block_line_section
);
727 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
731 /* We only want to iterate over the local symbols, not any
732 symbols in included symtabs. */
733 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
735 relocate_one_symbol (sym
, objfile
, delta
);
741 /* This stores relocated addresses and so must be cleared. This
742 will cause it to be recreated on demand. */
743 objfile
->psymbol_map
.clear ();
745 /* Relocate isolated symbols. */
749 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
750 relocate_one_symbol (iter
, objfile
, delta
);
756 for (i
= 0; i
< objfile
->num_sections
; ++i
)
757 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
760 /* Rebuild section map next time we need it. */
761 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
763 /* Update the table in exec_ops, used to read memory. */
764 struct obj_section
*s
;
765 ALL_OBJFILE_OSECTIONS (objfile
, s
)
767 int idx
= s
- objfile
->sections
;
769 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
770 obj_section_addr (s
));
777 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
778 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
780 The number and ordering of sections does differ between the two objfiles.
781 Only their names match. Also the file offsets will differ (objfile being
782 possibly prelinked but separate_debug_objfile is probably not prelinked) but
783 the in-memory absolute address as specified by NEW_OFFSETS must match both
787 objfile_relocate (struct objfile
*objfile
,
788 const struct section_offsets
*new_offsets
)
792 changed
|= objfile_relocate1 (objfile
, new_offsets
);
794 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
796 if (debug_objfile
== objfile
)
799 section_addr_info objfile_addrs
800 = build_section_addr_info_from_objfile (objfile
);
802 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
803 relative ones must be already created according to debug_objfile. */
805 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
807 gdb_assert (debug_objfile
->num_sections
808 == gdb_bfd_count_sections (debug_objfile
->obfd
));
809 std::vector
<struct section_offsets
>
810 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
811 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
812 debug_objfile
->num_sections
,
815 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
818 /* Relocate breakpoints as necessary, after things are relocated. */
820 breakpoint_re_set ();
823 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
825 Return non-zero iff any change happened. */
828 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
830 struct section_offsets
*new_offsets
=
831 ((struct section_offsets
*)
832 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
835 for (i
= 0; i
< objfile
->num_sections
; ++i
)
836 new_offsets
->offsets
[i
] = slide
;
838 return objfile_relocate1 (objfile
, new_offsets
);
841 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
842 SEPARATE_DEBUG_OBJFILEs. */
845 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
849 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
850 changed
|= objfile_rebase1 (debug_objfile
, slide
);
852 /* Relocate breakpoints as necessary, after things are relocated. */
854 breakpoint_re_set ();
857 /* Return non-zero if OBJFILE has partial symbols. */
860 objfile_has_partial_symbols (struct objfile
*objfile
)
865 /* If we have not read psymbols, but we have a function capable of reading
866 them, then that is an indication that they are in fact available. Without
867 this function the symbols may have been already read in but they also may
868 not be present in this objfile. */
869 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
870 && objfile
->sf
->sym_read_psymbols
!= NULL
)
873 return objfile
->sf
->qf
->has_symbols (objfile
);
876 /* Return non-zero if OBJFILE has full symbols. */
879 objfile_has_full_symbols (struct objfile
*objfile
)
881 return objfile
->compunit_symtabs
!= NULL
;
884 /* Return non-zero if OBJFILE has full or partial symbols, either directly
885 or through a separate debug file. */
888 objfile_has_symbols (struct objfile
*objfile
)
890 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
891 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
897 /* Many places in gdb want to test just to see if we have any partial
898 symbols available. This function returns zero if none are currently
899 available, nonzero otherwise. */
902 have_partial_symbols (void)
904 for (objfile
*ofp
: current_program_space
->objfiles ())
906 if (objfile_has_partial_symbols (ofp
))
912 /* Many places in gdb want to test just to see if we have any full
913 symbols available. This function returns zero if none are currently
914 available, nonzero otherwise. */
917 have_full_symbols (void)
919 for (objfile
*ofp
: current_program_space
->objfiles ())
921 if (objfile_has_full_symbols (ofp
))
928 /* This operations deletes all objfile entries that represent solibs that
929 weren't explicitly loaded by the user, via e.g., the add-symbol-file
933 objfile_purge_solibs (void)
935 for (objfile
*objf
: current_program_space
->objfiles_safe ())
937 /* We assume that the solib package has been purged already, or will
940 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
946 /* Many places in gdb want to test just to see if we have any minimal
947 symbols available. This function returns zero if none are currently
948 available, nonzero otherwise. */
951 have_minimal_symbols (void)
953 for (objfile
*ofp
: current_program_space
->objfiles ())
955 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
963 /* Qsort comparison function. */
966 sort_cmp (const struct obj_section
*sect1
, const obj_section
*sect2
)
968 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
969 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
971 if (sect1_addr
< sect2_addr
)
973 else if (sect1_addr
> sect2_addr
)
977 /* Sections are at the same address. This could happen if
978 A) we have an objfile and a separate debuginfo.
979 B) we are confused, and have added sections without proper relocation,
980 or something like that. */
982 const struct objfile
*const objfile1
= sect1
->objfile
;
983 const struct objfile
*const objfile2
= sect2
->objfile
;
985 if (objfile1
->separate_debug_objfile
== objfile2
986 || objfile2
->separate_debug_objfile
== objfile1
)
988 /* Case A. The ordering doesn't matter: separate debuginfo files
989 will be filtered out later. */
994 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
995 triage. This section could be slow (since we iterate over all
996 objfiles in each call to sort_cmp), but this shouldn't happen
997 very often (GDB is already in a confused state; one hopes this
998 doesn't happen at all). If you discover that significant time is
999 spent in the loops below, do 'set complaints 100' and examine the
1000 resulting complaints. */
1001 if (objfile1
== objfile2
)
1003 /* Both sections came from the same objfile. We are really
1004 confused. Sort on sequence order of sections within the
1005 objfile. The order of checks is important here, if we find a
1006 match on SECT2 first then either SECT2 is before SECT1, or,
1007 SECT2 == SECT1, in both cases we should return false. The
1008 second case shouldn't occur during normal use, but std::sort
1009 does check that '!(a < a)' when compiled in debug mode. */
1011 const struct obj_section
*osect
;
1013 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1016 else if (osect
== sect1
)
1019 /* We should have found one of the sections before getting here. */
1020 gdb_assert_not_reached ("section not found");
1024 /* Sort on sequence number of the objfile in the chain. */
1026 for (objfile
*objfile
: current_program_space
->objfiles ())
1027 if (objfile
== objfile1
)
1029 else if (objfile
== objfile2
)
1032 /* We should have found one of the objfiles before getting here. */
1033 gdb_assert_not_reached ("objfile not found");
1038 gdb_assert_not_reached ("unexpected code path");
1042 /* Select "better" obj_section to keep. We prefer the one that came from
1043 the real object, rather than the one from separate debuginfo.
1044 Most of the time the two sections are exactly identical, but with
1045 prelinking the .rel.dyn section in the real object may have different
1048 static struct obj_section
*
1049 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1051 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1052 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1053 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1054 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1055 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1057 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1062 /* Return 1 if SECTION should be inserted into the section map.
1063 We want to insert only non-overlay and non-TLS section. */
1066 insert_section_p (const struct bfd
*abfd
,
1067 const struct bfd_section
*section
)
1069 const bfd_vma lma
= bfd_section_lma (section
);
1071 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1072 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1073 /* This is an overlay section. IN_MEMORY check is needed to avoid
1074 discarding sections from the "system supplied DSO" (aka vdso)
1075 on some Linux systems (e.g. Fedora 11). */
1077 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1078 /* This is a TLS section. */
1084 /* Filter out overlapping sections where one section came from the real
1085 objfile, and the other from a separate debuginfo file.
1086 Return the size of table after redundant sections have been eliminated. */
1089 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1093 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1095 struct obj_section
*const sect1
= map
[i
];
1096 struct obj_section
*const sect2
= map
[i
+ 1];
1097 const struct objfile
*const objfile1
= sect1
->objfile
;
1098 const struct objfile
*const objfile2
= sect2
->objfile
;
1099 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1100 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1102 if (sect1_addr
== sect2_addr
1103 && (objfile1
->separate_debug_objfile
== objfile2
1104 || objfile2
->separate_debug_objfile
== objfile1
))
1106 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1115 gdb_assert (i
== map_size
- 1);
1119 /* The map should not have shrunk to less than half the original size. */
1120 gdb_assert (map_size
/ 2 <= j
);
1125 /* Filter out overlapping sections, issuing a warning if any are found.
1126 Overlapping sections could really be overlay sections which we didn't
1127 classify as such in insert_section_p, or we could be dealing with a
1131 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1135 for (i
= 0, j
= 0; i
< map_size
- 1; )
1140 for (k
= i
+ 1; k
< map_size
; k
++)
1142 struct obj_section
*const sect1
= map
[i
];
1143 struct obj_section
*const sect2
= map
[k
];
1144 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1145 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1146 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1148 gdb_assert (sect1_addr
<= sect2_addr
);
1150 if (sect1_endaddr
<= sect2_addr
)
1154 /* We have an overlap. Report it. */
1156 struct objfile
*const objf1
= sect1
->objfile
;
1157 struct objfile
*const objf2
= sect2
->objfile
;
1159 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1160 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1162 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1164 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1166 complaint (_("unexpected overlap between:\n"
1167 " (A) section `%s' from `%s' [%s, %s)\n"
1168 " (B) section `%s' from `%s' [%s, %s).\n"
1169 "Will ignore section B"),
1170 bfd_section_name (bfds1
), objfile_name (objf1
),
1171 paddress (gdbarch
, sect1_addr
),
1172 paddress (gdbarch
, sect1_endaddr
),
1173 bfd_section_name (bfds2
), objfile_name (objf2
),
1174 paddress (gdbarch
, sect2_addr
),
1175 paddress (gdbarch
, sect2_endaddr
));
1183 gdb_assert (i
== map_size
- 1);
1191 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1192 TLS, overlay and overlapping sections. */
1195 update_section_map (struct program_space
*pspace
,
1196 struct obj_section
***pmap
, int *pmap_size
)
1198 struct objfile_pspace_info
*pspace_info
;
1199 int alloc_size
, map_size
, i
;
1200 struct obj_section
*s
, **map
;
1202 pspace_info
= get_objfile_pspace_data (pspace
);
1203 gdb_assert (pspace_info
->section_map_dirty
!= 0
1204 || pspace_info
->new_objfiles_available
!= 0);
1210 for (objfile
*objfile
: pspace
->objfiles ())
1211 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1212 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1215 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1216 if (alloc_size
== 0)
1223 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1226 for (objfile
*objfile
: pspace
->objfiles ())
1227 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1228 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1231 std::sort (map
, map
+ alloc_size
, sort_cmp
);
1232 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1233 map_size
= filter_overlapping_sections(map
, map_size
);
1235 if (map_size
< alloc_size
)
1236 /* Some sections were eliminated. Trim excess space. */
1237 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1239 gdb_assert (alloc_size
== map_size
);
1242 *pmap_size
= map_size
;
1245 /* Bsearch comparison function. */
1248 bsearch_cmp (const void *key
, const void *elt
)
1250 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1251 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1253 if (pc
< obj_section_addr (section
))
1255 if (pc
< obj_section_endaddr (section
))
1260 /* Returns a section whose range includes PC or NULL if none found. */
1262 struct obj_section
*
1263 find_pc_section (CORE_ADDR pc
)
1265 struct objfile_pspace_info
*pspace_info
;
1266 struct obj_section
*s
, **sp
;
1268 /* Check for mapped overlay section first. */
1269 s
= find_pc_mapped_section (pc
);
1273 pspace_info
= get_objfile_pspace_data (current_program_space
);
1274 if (pspace_info
->section_map_dirty
1275 || (pspace_info
->new_objfiles_available
1276 && !pspace_info
->inhibit_updates
))
1278 update_section_map (current_program_space
,
1279 &pspace_info
->sections
,
1280 &pspace_info
->num_sections
);
1282 /* Don't need updates to section map until objfiles are added,
1283 removed or relocated. */
1284 pspace_info
->new_objfiles_available
= 0;
1285 pspace_info
->section_map_dirty
= 0;
1288 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1289 bsearch be non-NULL. */
1290 if (pspace_info
->sections
== NULL
)
1292 gdb_assert (pspace_info
->num_sections
== 0);
1296 sp
= (struct obj_section
**) bsearch (&pc
,
1297 pspace_info
->sections
,
1298 pspace_info
->num_sections
,
1299 sizeof (*pspace_info
->sections
),
1307 /* Return non-zero if PC is in a section called NAME. */
1310 pc_in_section (CORE_ADDR pc
, const char *name
)
1312 struct obj_section
*s
;
1315 s
= find_pc_section (pc
);
1318 && s
->the_bfd_section
->name
!= NULL
1319 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1324 /* Set section_map_dirty so section map will be rebuilt next time it
1325 is used. Called by reread_symbols. */
1328 objfiles_changed (void)
1330 /* Rebuild section map next time we need it. */
1331 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1334 /* See comments in objfiles.h. */
1336 scoped_restore_tmpl
<int>
1337 inhibit_section_map_updates (struct program_space
*pspace
)
1339 return scoped_restore_tmpl
<int>
1340 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1343 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1347 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1349 struct obj_section
*osect
;
1351 if (objfile
== NULL
)
1354 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1356 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1359 if (obj_section_addr (osect
) <= addr
1360 && addr
< obj_section_endaddr (osect
))
1367 shared_objfile_contains_address_p (struct program_space
*pspace
,
1370 for (objfile
*objfile
: pspace
->objfiles ())
1372 if ((objfile
->flags
& OBJF_SHARED
) != 0
1373 && is_addr_in_objfile (address
, objfile
))
1380 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1381 gdbarch method. It is equivalent to use the objfiles iterable,
1382 searching the objfiles in the order they are stored internally,
1383 ignoring CURRENT_OBJFILE.
1385 On most platforms, it should be close enough to doing the best
1386 we can without some knowledge specific to the architecture. */
1389 default_iterate_over_objfiles_in_search_order
1390 (struct gdbarch
*gdbarch
,
1391 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1392 void *cb_data
, struct objfile
*current_objfile
)
1396 for (objfile
*objfile
: current_program_space
->objfiles ())
1398 stop
= cb (objfile
, cb_data
);
1404 /* See objfiles.h. */
1407 objfile_name (const struct objfile
*objfile
)
1409 if (objfile
->obfd
!= NULL
)
1410 return bfd_get_filename (objfile
->obfd
);
1412 return objfile
->original_name
;
1415 /* See objfiles.h. */
1418 objfile_filename (const struct objfile
*objfile
)
1420 if (objfile
->obfd
!= NULL
)
1421 return bfd_get_filename (objfile
->obfd
);
1426 /* See objfiles.h. */
1429 objfile_debug_name (const struct objfile
*objfile
)
1431 return lbasename (objfile
->original_name
);
1434 /* See objfiles.h. */
1437 objfile_flavour_name (struct objfile
*objfile
)
1439 if (objfile
->obfd
!= NULL
)
1440 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));