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 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
548 free_objfile_separate_debug (struct objfile
*objfile
)
550 struct objfile
*child
;
552 for (child
= objfile
->separate_debug_objfile
; child
;)
554 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
560 /* Destroy an objfile and all the symtabs and psymtabs under it. */
564 /* First notify observers that this objfile is about to be freed. */
565 gdb::observers::free_objfile
.notify (this);
567 /* Free all separate debug objfiles. */
568 free_objfile_separate_debug (this);
570 if (separate_debug_objfile_backlink
)
572 /* We freed the separate debug file, make sure the base objfile
573 doesn't reference it. */
574 struct objfile
*child
;
576 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
580 /* THIS is the first child. */
581 separate_debug_objfile_backlink
->separate_debug_objfile
=
582 separate_debug_objfile_link
;
586 /* Find THIS in the list. */
589 if (child
->separate_debug_objfile_link
== this)
591 child
->separate_debug_objfile_link
=
592 separate_debug_objfile_link
;
595 child
= child
->separate_debug_objfile_link
;
601 /* Remove any references to this objfile in the global value
603 preserve_values (this);
605 /* It still may reference data modules have associated with the objfile and
606 the symbol file data. */
607 forget_cached_source_info_for_objfile (this);
609 breakpoint_free_objfile (this);
610 btrace_free_objfile (this);
612 /* First do any symbol file specific actions required when we are
613 finished with a particular symbol file. Note that if the objfile
614 is using reusable symbol information (via mmalloc) then each of
615 these routines is responsible for doing the correct thing, either
616 freeing things which are valid only during this particular gdb
617 execution, or leaving them to be reused during the next one. */
620 (*sf
->sym_finish
) (this);
622 /* Discard any data modules have associated with the objfile. The function
623 still may reference obfd. */
624 objfile_free_data (this);
627 gdb_bfd_unref (obfd
);
631 /* Remove it from the chain of all objfiles. */
633 unlink_objfile (this);
635 if (this == symfile_objfile
)
636 symfile_objfile
= NULL
;
638 /* Before the symbol table code was redone to make it easier to
639 selectively load and remove information particular to a specific
640 linkage unit, gdb used to do these things whenever the monolithic
641 symbol table was blown away. How much still needs to be done
642 is unknown, but we play it safe for now and keep each action until
643 it is shown to be no longer needed. */
645 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
646 for example), so we need to call this here. */
647 clear_pc_function_cache ();
649 /* Check to see if the current_source_symtab belongs to this objfile,
650 and if so, call clear_current_source_symtab_and_line. */
653 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
655 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
656 clear_current_source_symtab_and_line ();
659 /* Free the obstacks for non-reusable objfiles. */
660 obstack_free (&objfile_obstack
, 0);
662 /* Rebuild section map next time we need it. */
663 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
666 /* Free all the object files at once and clean up their users. */
669 free_all_objfiles (void)
673 /* Any objfile reference would become stale. */
674 for (so
= master_so_list (); so
; so
= so
->next
)
675 gdb_assert (so
->objfile
== NULL
);
677 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
679 clear_symtab_users (0);
682 /* A helper function for objfile_relocate1 that relocates a single
686 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
687 struct section_offsets
*delta
)
689 fixup_symbol_section (sym
, objfile
);
691 /* The RS6000 code from which this was taken skipped
692 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
693 But I'm leaving out that test, on the theory that
694 they can't possibly pass the tests below. */
695 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
696 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
697 && SYMBOL_SECTION (sym
) >= 0)
699 SET_SYMBOL_VALUE_ADDRESS (sym
,
700 SYMBOL_VALUE_ADDRESS (sym
)
701 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
705 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
706 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
707 Return non-zero iff any change happened. */
710 objfile_relocate1 (struct objfile
*objfile
,
711 const struct section_offsets
*new_offsets
)
713 struct section_offsets
*delta
=
714 ((struct section_offsets
*)
715 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
717 int something_changed
= 0;
719 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
722 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
723 if (ANOFFSET (delta
, i
) != 0)
724 something_changed
= 1;
726 if (!something_changed
)
729 /* OK, get all the symtabs. */
731 for (compunit_symtab
*cust
: objfile
->compunits ())
733 for (symtab
*s
: compunit_filetabs (cust
))
737 /* First the line table. */
738 l
= SYMTAB_LINETABLE (s
);
741 for (int i
= 0; i
< l
->nitems
; ++i
)
742 l
->item
[i
].pc
+= ANOFFSET (delta
,
743 COMPUNIT_BLOCK_LINE_SECTION
749 for (compunit_symtab
*cust
: objfile
->compunits ())
751 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
752 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
754 if (BLOCKVECTOR_MAP (bv
))
755 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
756 ANOFFSET (delta
, block_line_section
));
758 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
762 struct mdict_iterator miter
;
764 b
= BLOCKVECTOR_BLOCK (bv
, i
);
765 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
766 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
768 if (BLOCK_RANGES (b
) != nullptr)
769 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
771 BLOCK_RANGE_START (b
, j
)
772 += ANOFFSET (delta
, block_line_section
);
773 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
777 /* We only want to iterate over the local symbols, not any
778 symbols in included symtabs. */
779 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
781 relocate_one_symbol (sym
, objfile
, delta
);
787 /* This stores relocated addresses and so must be cleared. This
788 will cause it to be recreated on demand. */
789 objfile
->psymbol_map
.clear ();
791 /* Relocate isolated symbols. */
795 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
796 relocate_one_symbol (iter
, objfile
, delta
);
802 for (i
= 0; i
< objfile
->num_sections
; ++i
)
803 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
806 /* Rebuild section map next time we need it. */
807 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
809 /* Update the table in exec_ops, used to read memory. */
810 struct obj_section
*s
;
811 ALL_OBJFILE_OSECTIONS (objfile
, s
)
813 int idx
= s
- objfile
->sections
;
815 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
816 obj_section_addr (s
));
823 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
824 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
826 The number and ordering of sections does differ between the two objfiles.
827 Only their names match. Also the file offsets will differ (objfile being
828 possibly prelinked but separate_debug_objfile is probably not prelinked) but
829 the in-memory absolute address as specified by NEW_OFFSETS must match both
833 objfile_relocate (struct objfile
*objfile
,
834 const struct section_offsets
*new_offsets
)
838 changed
|= objfile_relocate1 (objfile
, new_offsets
);
840 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
842 if (debug_objfile
== objfile
)
845 section_addr_info objfile_addrs
846 = build_section_addr_info_from_objfile (objfile
);
848 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
849 relative ones must be already created according to debug_objfile. */
851 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
853 gdb_assert (debug_objfile
->num_sections
854 == gdb_bfd_count_sections (debug_objfile
->obfd
));
855 std::vector
<struct section_offsets
>
856 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
857 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
858 debug_objfile
->num_sections
,
861 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
864 /* Relocate breakpoints as necessary, after things are relocated. */
866 breakpoint_re_set ();
869 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
871 Return non-zero iff any change happened. */
874 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
876 struct section_offsets
*new_offsets
=
877 ((struct section_offsets
*)
878 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
881 for (i
= 0; i
< objfile
->num_sections
; ++i
)
882 new_offsets
->offsets
[i
] = slide
;
884 return objfile_relocate1 (objfile
, new_offsets
);
887 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
888 SEPARATE_DEBUG_OBJFILEs. */
891 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
895 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
896 changed
|= objfile_rebase1 (debug_objfile
, slide
);
898 /* Relocate breakpoints as necessary, after things are relocated. */
900 breakpoint_re_set ();
903 /* Return non-zero if OBJFILE has partial symbols. */
906 objfile_has_partial_symbols (struct objfile
*objfile
)
911 /* If we have not read psymbols, but we have a function capable of reading
912 them, then that is an indication that they are in fact available. Without
913 this function the symbols may have been already read in but they also may
914 not be present in this objfile. */
915 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
916 && objfile
->sf
->sym_read_psymbols
!= NULL
)
919 return objfile
->sf
->qf
->has_symbols (objfile
);
922 /* Return non-zero if OBJFILE has full symbols. */
925 objfile_has_full_symbols (struct objfile
*objfile
)
927 return objfile
->compunit_symtabs
!= NULL
;
930 /* Return non-zero if OBJFILE has full or partial symbols, either directly
931 or through a separate debug file. */
934 objfile_has_symbols (struct objfile
*objfile
)
936 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
937 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
943 /* Many places in gdb want to test just to see if we have any partial
944 symbols available. This function returns zero if none are currently
945 available, nonzero otherwise. */
948 have_partial_symbols (void)
950 for (objfile
*ofp
: current_program_space
->objfiles ())
952 if (objfile_has_partial_symbols (ofp
))
958 /* Many places in gdb want to test just to see if we have any full
959 symbols available. This function returns zero if none are currently
960 available, nonzero otherwise. */
963 have_full_symbols (void)
965 for (objfile
*ofp
: current_program_space
->objfiles ())
967 if (objfile_has_full_symbols (ofp
))
974 /* This operations deletes all objfile entries that represent solibs that
975 weren't explicitly loaded by the user, via e.g., the add-symbol-file
979 objfile_purge_solibs (void)
981 for (objfile
*objf
: current_program_space
->objfiles_safe ())
983 /* We assume that the solib package has been purged already, or will
986 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
992 /* Many places in gdb want to test just to see if we have any minimal
993 symbols available. This function returns zero if none are currently
994 available, nonzero otherwise. */
997 have_minimal_symbols (void)
999 for (objfile
*ofp
: current_program_space
->objfiles ())
1001 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
1009 /* Qsort comparison function. */
1012 sort_cmp (const struct obj_section
*sect1
, const obj_section
*sect2
)
1014 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1015 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1017 if (sect1_addr
< sect2_addr
)
1019 else if (sect1_addr
> sect2_addr
)
1023 /* Sections are at the same address. This could happen if
1024 A) we have an objfile and a separate debuginfo.
1025 B) we are confused, and have added sections without proper relocation,
1026 or something like that. */
1028 const struct objfile
*const objfile1
= sect1
->objfile
;
1029 const struct objfile
*const objfile2
= sect2
->objfile
;
1031 if (objfile1
->separate_debug_objfile
== objfile2
1032 || objfile2
->separate_debug_objfile
== objfile1
)
1034 /* Case A. The ordering doesn't matter: separate debuginfo files
1035 will be filtered out later. */
1040 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1041 triage. This section could be slow (since we iterate over all
1042 objfiles in each call to sort_cmp), but this shouldn't happen
1043 very often (GDB is already in a confused state; one hopes this
1044 doesn't happen at all). If you discover that significant time is
1045 spent in the loops below, do 'set complaints 100' and examine the
1046 resulting complaints. */
1047 if (objfile1
== objfile2
)
1049 /* Both sections came from the same objfile. We are really
1050 confused. Sort on sequence order of sections within the
1051 objfile. The order of checks is important here, if we find a
1052 match on SECT2 first then either SECT2 is before SECT1, or,
1053 SECT2 == SECT1, in both cases we should return false. The
1054 second case shouldn't occur during normal use, but std::sort
1055 does check that '!(a < a)' when compiled in debug mode. */
1057 const struct obj_section
*osect
;
1059 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1062 else if (osect
== sect1
)
1065 /* We should have found one of the sections before getting here. */
1066 gdb_assert_not_reached ("section not found");
1070 /* Sort on sequence number of the objfile in the chain. */
1072 for (objfile
*objfile
: current_program_space
->objfiles ())
1073 if (objfile
== objfile1
)
1075 else if (objfile
== objfile2
)
1078 /* We should have found one of the objfiles before getting here. */
1079 gdb_assert_not_reached ("objfile not found");
1084 gdb_assert_not_reached ("unexpected code path");
1088 /* Select "better" obj_section to keep. We prefer the one that came from
1089 the real object, rather than the one from separate debuginfo.
1090 Most of the time the two sections are exactly identical, but with
1091 prelinking the .rel.dyn section in the real object may have different
1094 static struct obj_section
*
1095 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1097 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1098 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1099 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1100 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1101 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1103 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1108 /* Return 1 if SECTION should be inserted into the section map.
1109 We want to insert only non-overlay and non-TLS section. */
1112 insert_section_p (const struct bfd
*abfd
,
1113 const struct bfd_section
*section
)
1115 const bfd_vma lma
= bfd_section_lma (section
);
1117 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1118 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1119 /* This is an overlay section. IN_MEMORY check is needed to avoid
1120 discarding sections from the "system supplied DSO" (aka vdso)
1121 on some Linux systems (e.g. Fedora 11). */
1123 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1124 /* This is a TLS section. */
1130 /* Filter out overlapping sections where one section came from the real
1131 objfile, and the other from a separate debuginfo file.
1132 Return the size of table after redundant sections have been eliminated. */
1135 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1139 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1141 struct obj_section
*const sect1
= map
[i
];
1142 struct obj_section
*const sect2
= map
[i
+ 1];
1143 const struct objfile
*const objfile1
= sect1
->objfile
;
1144 const struct objfile
*const objfile2
= sect2
->objfile
;
1145 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1146 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1148 if (sect1_addr
== sect2_addr
1149 && (objfile1
->separate_debug_objfile
== objfile2
1150 || objfile2
->separate_debug_objfile
== objfile1
))
1152 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1161 gdb_assert (i
== map_size
- 1);
1165 /* The map should not have shrunk to less than half the original size. */
1166 gdb_assert (map_size
/ 2 <= j
);
1171 /* Filter out overlapping sections, issuing a warning if any are found.
1172 Overlapping sections could really be overlay sections which we didn't
1173 classify as such in insert_section_p, or we could be dealing with a
1177 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1181 for (i
= 0, j
= 0; i
< map_size
- 1; )
1186 for (k
= i
+ 1; k
< map_size
; k
++)
1188 struct obj_section
*const sect1
= map
[i
];
1189 struct obj_section
*const sect2
= map
[k
];
1190 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1191 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1192 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1194 gdb_assert (sect1_addr
<= sect2_addr
);
1196 if (sect1_endaddr
<= sect2_addr
)
1200 /* We have an overlap. Report it. */
1202 struct objfile
*const objf1
= sect1
->objfile
;
1203 struct objfile
*const objf2
= sect2
->objfile
;
1205 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1206 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1208 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1210 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1212 complaint (_("unexpected overlap between:\n"
1213 " (A) section `%s' from `%s' [%s, %s)\n"
1214 " (B) section `%s' from `%s' [%s, %s).\n"
1215 "Will ignore section B"),
1216 bfd_section_name (bfds1
), objfile_name (objf1
),
1217 paddress (gdbarch
, sect1_addr
),
1218 paddress (gdbarch
, sect1_endaddr
),
1219 bfd_section_name (bfds2
), objfile_name (objf2
),
1220 paddress (gdbarch
, sect2_addr
),
1221 paddress (gdbarch
, sect2_endaddr
));
1229 gdb_assert (i
== map_size
- 1);
1237 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1238 TLS, overlay and overlapping sections. */
1241 update_section_map (struct program_space
*pspace
,
1242 struct obj_section
***pmap
, int *pmap_size
)
1244 struct objfile_pspace_info
*pspace_info
;
1245 int alloc_size
, map_size
, i
;
1246 struct obj_section
*s
, **map
;
1248 pspace_info
= get_objfile_pspace_data (pspace
);
1249 gdb_assert (pspace_info
->section_map_dirty
!= 0
1250 || pspace_info
->new_objfiles_available
!= 0);
1256 for (objfile
*objfile
: pspace
->objfiles ())
1257 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1258 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1261 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1262 if (alloc_size
== 0)
1269 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1272 for (objfile
*objfile
: pspace
->objfiles ())
1273 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1274 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1277 std::sort (map
, map
+ alloc_size
, sort_cmp
);
1278 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1279 map_size
= filter_overlapping_sections(map
, map_size
);
1281 if (map_size
< alloc_size
)
1282 /* Some sections were eliminated. Trim excess space. */
1283 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1285 gdb_assert (alloc_size
== map_size
);
1288 *pmap_size
= map_size
;
1291 /* Bsearch comparison function. */
1294 bsearch_cmp (const void *key
, const void *elt
)
1296 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1297 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1299 if (pc
< obj_section_addr (section
))
1301 if (pc
< obj_section_endaddr (section
))
1306 /* Returns a section whose range includes PC or NULL if none found. */
1308 struct obj_section
*
1309 find_pc_section (CORE_ADDR pc
)
1311 struct objfile_pspace_info
*pspace_info
;
1312 struct obj_section
*s
, **sp
;
1314 /* Check for mapped overlay section first. */
1315 s
= find_pc_mapped_section (pc
);
1319 pspace_info
= get_objfile_pspace_data (current_program_space
);
1320 if (pspace_info
->section_map_dirty
1321 || (pspace_info
->new_objfiles_available
1322 && !pspace_info
->inhibit_updates
))
1324 update_section_map (current_program_space
,
1325 &pspace_info
->sections
,
1326 &pspace_info
->num_sections
);
1328 /* Don't need updates to section map until objfiles are added,
1329 removed or relocated. */
1330 pspace_info
->new_objfiles_available
= 0;
1331 pspace_info
->section_map_dirty
= 0;
1334 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1335 bsearch be non-NULL. */
1336 if (pspace_info
->sections
== NULL
)
1338 gdb_assert (pspace_info
->num_sections
== 0);
1342 sp
= (struct obj_section
**) bsearch (&pc
,
1343 pspace_info
->sections
,
1344 pspace_info
->num_sections
,
1345 sizeof (*pspace_info
->sections
),
1353 /* Return non-zero if PC is in a section called NAME. */
1356 pc_in_section (CORE_ADDR pc
, const char *name
)
1358 struct obj_section
*s
;
1361 s
= find_pc_section (pc
);
1364 && s
->the_bfd_section
->name
!= NULL
1365 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1370 /* Set section_map_dirty so section map will be rebuilt next time it
1371 is used. Called by reread_symbols. */
1374 objfiles_changed (void)
1376 /* Rebuild section map next time we need it. */
1377 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1380 /* See comments in objfiles.h. */
1382 scoped_restore_tmpl
<int>
1383 inhibit_section_map_updates (struct program_space
*pspace
)
1385 return scoped_restore_tmpl
<int>
1386 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1389 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1393 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1395 struct obj_section
*osect
;
1397 if (objfile
== NULL
)
1400 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1402 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1405 if (obj_section_addr (osect
) <= addr
1406 && addr
< obj_section_endaddr (osect
))
1413 shared_objfile_contains_address_p (struct program_space
*pspace
,
1416 for (objfile
*objfile
: pspace
->objfiles ())
1418 if ((objfile
->flags
& OBJF_SHARED
) != 0
1419 && is_addr_in_objfile (address
, objfile
))
1426 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1427 gdbarch method. It is equivalent to use the objfiles iterable,
1428 searching the objfiles in the order they are stored internally,
1429 ignoring CURRENT_OBJFILE.
1431 On most platforms, it should be close enough to doing the best
1432 we can without some knowledge specific to the architecture. */
1435 default_iterate_over_objfiles_in_search_order
1436 (struct gdbarch
*gdbarch
,
1437 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1438 void *cb_data
, struct objfile
*current_objfile
)
1442 for (objfile
*objfile
: current_program_space
->objfiles ())
1444 stop
= cb (objfile
, cb_data
);
1450 /* See objfiles.h. */
1453 objfile_name (const struct objfile
*objfile
)
1455 if (objfile
->obfd
!= NULL
)
1456 return bfd_get_filename (objfile
->obfd
);
1458 return objfile
->original_name
;
1461 /* See objfiles.h. */
1464 objfile_filename (const struct objfile
*objfile
)
1466 if (objfile
->obfd
!= NULL
)
1467 return bfd_get_filename (objfile
->obfd
);
1472 /* See objfiles.h. */
1475 objfile_debug_name (const struct objfile
*objfile
)
1477 return lbasename (objfile
->original_name
);
1480 /* See objfiles.h. */
1483 objfile_flavour_name (struct objfile
*objfile
)
1485 if (objfile
->obfd
!= NULL
)
1486 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));