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"
60 /* Keep a registry of per-objfile data-pointers required by other GDB
63 DEFINE_REGISTRY (objfile
, REGISTRY_ACCESS_FIELD
)
65 /* Externally visible variables that are owned by this module.
66 See declarations in objfile.h for more info. */
68 struct objfile_pspace_info
70 objfile_pspace_info () = default;
71 ~objfile_pspace_info ();
73 struct obj_section
**sections
= nullptr;
76 /* Nonzero if object files have been added since the section map
78 int new_objfiles_available
= 0;
80 /* Nonzero if the section map MUST be updated before use. */
81 int section_map_dirty
= 0;
83 /* Nonzero if section map updates should be inhibited if possible. */
84 int inhibit_updates
= 0;
87 /* Per-program-space data key. */
88 static const struct program_space_key
<objfile_pspace_info
>
91 objfile_pspace_info::~objfile_pspace_info ()
96 /* Get the current svr4 data. If none is found yet, add it now. This
97 function always returns a valid object. */
99 static struct objfile_pspace_info
*
100 get_objfile_pspace_data (struct program_space
*pspace
)
102 struct objfile_pspace_info
*info
;
104 info
= objfiles_pspace_data
.get (pspace
);
106 info
= objfiles_pspace_data
.emplace (pspace
);
113 /* Per-BFD data key. */
115 static const struct bfd_key
<objfile_per_bfd_storage
> objfiles_bfd_data
;
117 objfile_per_bfd_storage::~objfile_per_bfd_storage ()
121 /* Create the per-BFD storage object for OBJFILE. If ABFD is not
122 NULL, and it already has a per-BFD storage object, use that.
123 Otherwise, allocate a new per-BFD storage object. Note that it is
124 not safe to call this multiple times for a given OBJFILE -- it can
125 only be called when allocating or re-initializing OBJFILE. */
127 static struct objfile_per_bfd_storage
*
128 get_objfile_bfd_data (struct objfile
*objfile
, struct bfd
*abfd
)
130 struct objfile_per_bfd_storage
*storage
= NULL
;
133 storage
= objfiles_bfd_data
.get (abfd
);
137 storage
= new objfile_per_bfd_storage
;
138 /* If the object requires gdb to do relocations, we simply fall
139 back to not sharing data across users. These cases are rare
140 enough that this seems reasonable. */
141 if (abfd
!= NULL
&& !gdb_bfd_requires_relocations (abfd
))
142 objfiles_bfd_data
.set (abfd
, storage
);
144 /* Look up the gdbarch associated with the BFD. */
146 storage
->gdbarch
= gdbarch_from_bfd (abfd
);
152 /* See objfiles.h. */
155 set_objfile_per_bfd (struct objfile
*objfile
)
157 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, objfile
->obfd
);
160 /* Set the objfile's per-BFD notion of the "main" name and
164 set_objfile_main_name (struct objfile
*objfile
,
165 const char *name
, enum language lang
)
167 if (objfile
->per_bfd
->name_of_main
== NULL
168 || strcmp (objfile
->per_bfd
->name_of_main
, name
) != 0)
169 objfile
->per_bfd
->name_of_main
170 = obstack_strdup (&objfile
->per_bfd
->storage_obstack
, name
);
171 objfile
->per_bfd
->language_of_main
= lang
;
174 /* Helper structure to map blocks to static link properties in hash tables. */
176 struct static_link_htab_entry
178 const struct block
*block
;
179 const struct dynamic_prop
*static_link
;
182 /* Return a hash code for struct static_link_htab_entry *P. */
185 static_link_htab_entry_hash (const void *p
)
187 const struct static_link_htab_entry
*e
188 = (const struct static_link_htab_entry
*) p
;
190 return htab_hash_pointer (e
->block
);
193 /* Return whether P1 an P2 (pointers to struct static_link_htab_entry) are
194 mappings for the same block. */
197 static_link_htab_entry_eq (const void *p1
, const void *p2
)
199 const struct static_link_htab_entry
*e1
200 = (const struct static_link_htab_entry
*) p1
;
201 const struct static_link_htab_entry
*e2
202 = (const struct static_link_htab_entry
*) p2
;
204 return e1
->block
== e2
->block
;
207 /* Register STATIC_LINK as the static link for BLOCK, which is part of OBJFILE.
208 Must not be called more than once for each BLOCK. */
211 objfile_register_static_link (struct objfile
*objfile
,
212 const struct block
*block
,
213 const struct dynamic_prop
*static_link
)
216 struct static_link_htab_entry lookup_entry
;
217 struct static_link_htab_entry
*entry
;
219 if (objfile
->static_links
== NULL
)
220 objfile
->static_links
.reset (htab_create_alloc
221 (1, &static_link_htab_entry_hash
, static_link_htab_entry_eq
, NULL
,
224 /* Create a slot for the mapping, make sure it's the first mapping for this
225 block and then create the mapping itself. */
226 lookup_entry
.block
= block
;
227 slot
= htab_find_slot (objfile
->static_links
.get (), &lookup_entry
, INSERT
);
228 gdb_assert (*slot
== NULL
);
230 entry
= XOBNEW (&objfile
->objfile_obstack
, static_link_htab_entry
);
231 entry
->block
= block
;
232 entry
->static_link
= static_link
;
233 *slot
= (void *) entry
;
236 /* Look for a static link for BLOCK, which is part of OBJFILE. Return NULL if
239 const struct dynamic_prop
*
240 objfile_lookup_static_link (struct objfile
*objfile
,
241 const struct block
*block
)
243 struct static_link_htab_entry
*entry
;
244 struct static_link_htab_entry lookup_entry
;
246 if (objfile
->static_links
== NULL
)
248 lookup_entry
.block
= block
;
249 entry
= ((struct static_link_htab_entry
*)
250 htab_find (objfile
->static_links
.get (), &lookup_entry
));
254 gdb_assert (entry
->block
== block
);
255 return entry
->static_link
;
260 /* Called via bfd_map_over_sections to build up the section table that
261 the objfile references. The objfile contains pointers to the start
262 of the table (objfile->sections) and to the first location after
263 the end of the table (objfile->sections_end). */
266 add_to_objfile_sections_full (struct bfd
*abfd
, struct bfd_section
*asect
,
267 struct objfile
*objfile
, int force
)
269 struct obj_section
*section
;
275 aflag
= bfd_section_flags (asect
);
276 if (!(aflag
& SEC_ALLOC
))
280 section
= &objfile
->sections
[gdb_bfd_section_index (abfd
, asect
)];
281 section
->objfile
= objfile
;
282 section
->the_bfd_section
= asect
;
283 section
->ovly_mapped
= 0;
287 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
290 add_to_objfile_sections_full (abfd
, asect
, (struct objfile
*) objfilep
, 0);
293 /* Builds a section table for OBJFILE.
295 Note that the OFFSET and OVLY_MAPPED in each table entry are
296 initialized to zero. */
299 build_objfile_section_table (struct objfile
*objfile
)
301 int count
= gdb_bfd_count_sections (objfile
->obfd
);
303 objfile
->sections
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
306 objfile
->sections_end
= (objfile
->sections
+ count
);
307 bfd_map_over_sections (objfile
->obfd
,
308 add_to_objfile_sections
, (void *) objfile
);
310 /* See gdb_bfd_section_index. */
311 add_to_objfile_sections_full (objfile
->obfd
, bfd_com_section_ptr
, objfile
, 1);
312 add_to_objfile_sections_full (objfile
->obfd
, bfd_und_section_ptr
, objfile
, 1);
313 add_to_objfile_sections_full (objfile
->obfd
, bfd_abs_section_ptr
, objfile
, 1);
314 add_to_objfile_sections_full (objfile
->obfd
, bfd_ind_section_ptr
, objfile
, 1);
317 /* Given a pointer to an initialized bfd (ABFD) and some flag bits,
318 initialize the new objfile as best we can and link it into the list
319 of all known objfiles.
321 NAME should contain original non-canonicalized filename or other
322 identifier as entered by user. If there is no better source use
323 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
324 NAME content is copied into returned objfile.
326 The FLAGS word contains various bits (OBJF_*) that can be taken as
327 requests for specific operations. Other bits like OBJF_SHARED are
328 simply copied through to the new objfile flags member. */
330 objfile::objfile (bfd
*abfd
, const char *name
, objfile_flags flags_
)
332 pspace (current_program_space
),
333 partial_symtabs (new psymtab_storage ()),
336 const char *expanded_name
;
338 /* We could use obstack_specify_allocation here instead, but
339 gdb_obstack.h specifies the alloc/dealloc functions. */
340 obstack_init (&objfile_obstack
);
342 objfile_alloc_data (this);
344 gdb::unique_xmalloc_ptr
<char> name_holder
;
347 gdb_assert (abfd
== NULL
);
348 gdb_assert ((flags
& OBJF_NOT_FILENAME
) != 0);
349 expanded_name
= "<<anonymous objfile>>";
351 else if ((flags
& OBJF_NOT_FILENAME
) != 0
352 || is_target_filename (name
))
353 expanded_name
= name
;
356 name_holder
= gdb_abspath (name
);
357 expanded_name
= name_holder
.get ();
359 original_name
= obstack_strdup (&objfile_obstack
, expanded_name
);
361 /* Update the per-objfile information that comes from the bfd, ensuring
362 that any data that is reference is saved in the per-objfile data
368 mtime
= bfd_get_mtime (abfd
);
370 /* Build section table. */
371 build_objfile_section_table (this);
374 per_bfd
= get_objfile_bfd_data (this, abfd
);
377 /* Retrieve the gdbarch associated with OBJFILE. */
380 get_objfile_arch (const struct objfile
*objfile
)
382 return objfile
->per_bfd
->gdbarch
;
385 /* If there is a valid and known entry point, function fills *ENTRY_P with it
386 and returns non-zero; otherwise it returns zero. */
389 entry_point_address_query (CORE_ADDR
*entry_p
)
391 if (symfile_objfile
== NULL
|| !symfile_objfile
->per_bfd
->ei
.entry_point_p
)
394 *entry_p
= (symfile_objfile
->per_bfd
->ei
.entry_point
395 + ANOFFSET (symfile_objfile
->section_offsets
,
396 symfile_objfile
->per_bfd
->ei
.the_bfd_section_index
));
401 /* Get current entry point address. Call error if it is not known. */
404 entry_point_address (void)
408 if (!entry_point_address_query (&retval
))
409 error (_("Entry point address is not known."));
414 separate_debug_iterator
&
415 separate_debug_iterator::operator++ ()
417 gdb_assert (m_objfile
!= nullptr);
421 /* If any, return the first child. */
422 res
= m_objfile
->separate_debug_objfile
;
429 /* Common case where there is no separate debug objfile. */
430 if (m_objfile
== m_parent
)
436 /* Return the brother if any. Note that we don't iterate on brothers of
438 res
= m_objfile
->separate_debug_objfile_link
;
445 for (res
= m_objfile
->separate_debug_objfile_backlink
;
447 res
= res
->separate_debug_objfile_backlink
)
449 gdb_assert (res
!= nullptr);
450 if (res
->separate_debug_objfile_link
!= nullptr)
452 m_objfile
= res
->separate_debug_objfile_link
;
460 /* Add OBJFILE as a separate debug objfile of PARENT. */
463 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
465 gdb_assert (objfile
&& parent
);
467 /* Must not be already in a list. */
468 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
469 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
470 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
471 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
472 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
474 objfile
->separate_debug_objfile_backlink
= parent
;
475 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
476 parent
->separate_debug_objfile
= objfile
;
479 /* See objfiles.h. */
482 objfile::make (bfd
*bfd_
, const char *name_
, objfile_flags flags_
,
485 objfile
*result
= new objfile (bfd_
, name_
, flags_
);
486 if (parent
!= nullptr)
487 add_separate_debug_objfile (result
, parent
);
489 current_program_space
->add_objfile (result
, parent
);
491 /* Rebuild section map next time we need it. */
492 get_objfile_pspace_data (current_program_space
)->new_objfiles_available
= 1;
497 /* See objfiles.h. */
502 current_program_space
->remove_objfile (this);
506 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
510 free_objfile_separate_debug (struct objfile
*objfile
)
512 struct objfile
*child
;
514 for (child
= objfile
->separate_debug_objfile
; child
;)
516 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
522 /* Destroy an objfile and all the symtabs and psymtabs under it. */
526 /* First notify observers that this objfile is about to be freed. */
527 gdb::observers::free_objfile
.notify (this);
529 /* Free all separate debug objfiles. */
530 free_objfile_separate_debug (this);
532 if (separate_debug_objfile_backlink
)
534 /* We freed the separate debug file, make sure the base objfile
535 doesn't reference it. */
536 struct objfile
*child
;
538 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
542 /* THIS is the first child. */
543 separate_debug_objfile_backlink
->separate_debug_objfile
=
544 separate_debug_objfile_link
;
548 /* Find THIS in the list. */
551 if (child
->separate_debug_objfile_link
== this)
553 child
->separate_debug_objfile_link
=
554 separate_debug_objfile_link
;
557 child
= child
->separate_debug_objfile_link
;
563 /* Remove any references to this objfile in the global value
565 preserve_values (this);
567 /* It still may reference data modules have associated with the objfile and
568 the symbol file data. */
569 forget_cached_source_info_for_objfile (this);
571 breakpoint_free_objfile (this);
572 btrace_free_objfile (this);
574 /* First do any symbol file specific actions required when we are
575 finished with a particular symbol file. Note that if the objfile
576 is using reusable symbol information (via mmalloc) then each of
577 these routines is responsible for doing the correct thing, either
578 freeing things which are valid only during this particular gdb
579 execution, or leaving them to be reused during the next one. */
582 (*sf
->sym_finish
) (this);
584 /* Discard any data modules have associated with the objfile. The function
585 still may reference obfd. */
586 objfile_free_data (this);
589 gdb_bfd_unref (obfd
);
593 /* Before the symbol table code was redone to make it easier to
594 selectively load and remove information particular to a specific
595 linkage unit, gdb used to do these things whenever the monolithic
596 symbol table was blown away. How much still needs to be done
597 is unknown, but we play it safe for now and keep each action until
598 it is shown to be no longer needed. */
600 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
601 for example), so we need to call this here. */
602 clear_pc_function_cache ();
604 /* Check to see if the current_source_symtab belongs to this objfile,
605 and if so, call clear_current_source_symtab_and_line. */
608 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
610 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
611 clear_current_source_symtab_and_line ();
614 /* Free the obstacks for non-reusable objfiles. */
615 obstack_free (&objfile_obstack
, 0);
617 /* Rebuild section map next time we need it. */
618 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
621 /* Free all the object files at once and clean up their users. */
624 free_all_objfiles (void)
628 /* Any objfile reference would become stale. */
629 for (so
= master_so_list (); so
; so
= so
->next
)
630 gdb_assert (so
->objfile
== NULL
);
632 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
634 clear_symtab_users (0);
637 /* A helper function for objfile_relocate1 that relocates a single
641 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
642 struct section_offsets
*delta
)
644 fixup_symbol_section (sym
, objfile
);
646 /* The RS6000 code from which this was taken skipped
647 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
648 But I'm leaving out that test, on the theory that
649 they can't possibly pass the tests below. */
650 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
651 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
652 && SYMBOL_SECTION (sym
) >= 0)
654 SET_SYMBOL_VALUE_ADDRESS (sym
,
655 SYMBOL_VALUE_ADDRESS (sym
)
656 + ANOFFSET (delta
, SYMBOL_SECTION (sym
)));
660 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
661 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
662 Return non-zero iff any change happened. */
665 objfile_relocate1 (struct objfile
*objfile
,
666 const struct section_offsets
*new_offsets
)
668 struct section_offsets
*delta
=
669 ((struct section_offsets
*)
670 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
672 int something_changed
= 0;
674 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
677 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
678 if (ANOFFSET (delta
, i
) != 0)
679 something_changed
= 1;
681 if (!something_changed
)
684 /* OK, get all the symtabs. */
686 for (compunit_symtab
*cust
: objfile
->compunits ())
688 for (symtab
*s
: compunit_filetabs (cust
))
692 /* First the line table. */
693 l
= SYMTAB_LINETABLE (s
);
696 for (int i
= 0; i
< l
->nitems
; ++i
)
697 l
->item
[i
].pc
+= ANOFFSET (delta
,
698 COMPUNIT_BLOCK_LINE_SECTION
704 for (compunit_symtab
*cust
: objfile
->compunits ())
706 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
707 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
709 if (BLOCKVECTOR_MAP (bv
))
710 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
711 ANOFFSET (delta
, block_line_section
));
713 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
717 struct mdict_iterator miter
;
719 b
= BLOCKVECTOR_BLOCK (bv
, i
);
720 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
721 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
723 if (BLOCK_RANGES (b
) != nullptr)
724 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
726 BLOCK_RANGE_START (b
, j
)
727 += ANOFFSET (delta
, block_line_section
);
728 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
732 /* We only want to iterate over the local symbols, not any
733 symbols in included symtabs. */
734 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
736 relocate_one_symbol (sym
, objfile
, delta
);
742 /* This stores relocated addresses and so must be cleared. This
743 will cause it to be recreated on demand. */
744 objfile
->psymbol_map
.clear ();
746 /* Relocate isolated symbols. */
750 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
751 relocate_one_symbol (iter
, objfile
, delta
);
757 for (i
= 0; i
< objfile
->num_sections
; ++i
)
758 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
761 /* Rebuild section map next time we need it. */
762 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
764 /* Update the table in exec_ops, used to read memory. */
765 struct obj_section
*s
;
766 ALL_OBJFILE_OSECTIONS (objfile
, s
)
768 int idx
= s
- objfile
->sections
;
770 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
771 obj_section_addr (s
));
778 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
779 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
781 The number and ordering of sections does differ between the two objfiles.
782 Only their names match. Also the file offsets will differ (objfile being
783 possibly prelinked but separate_debug_objfile is probably not prelinked) but
784 the in-memory absolute address as specified by NEW_OFFSETS must match both
788 objfile_relocate (struct objfile
*objfile
,
789 const struct section_offsets
*new_offsets
)
793 changed
|= objfile_relocate1 (objfile
, new_offsets
);
795 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
797 if (debug_objfile
== objfile
)
800 section_addr_info objfile_addrs
801 = build_section_addr_info_from_objfile (objfile
);
803 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
804 relative ones must be already created according to debug_objfile. */
806 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
808 gdb_assert (debug_objfile
->num_sections
809 == gdb_bfd_count_sections (debug_objfile
->obfd
));
810 std::vector
<struct section_offsets
>
811 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
812 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
813 debug_objfile
->num_sections
,
816 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
819 /* Relocate breakpoints as necessary, after things are relocated. */
821 breakpoint_re_set ();
824 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
826 Return non-zero iff any change happened. */
829 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
831 struct section_offsets
*new_offsets
=
832 ((struct section_offsets
*)
833 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
836 for (i
= 0; i
< objfile
->num_sections
; ++i
)
837 new_offsets
->offsets
[i
] = slide
;
839 return objfile_relocate1 (objfile
, new_offsets
);
842 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
843 SEPARATE_DEBUG_OBJFILEs. */
846 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
850 for (::objfile
*debug_objfile
: objfile
->separate_debug_objfiles ())
851 changed
|= objfile_rebase1 (debug_objfile
, slide
);
853 /* Relocate breakpoints as necessary, after things are relocated. */
855 breakpoint_re_set ();
858 /* Return non-zero if OBJFILE has partial symbols. */
861 objfile_has_partial_symbols (struct objfile
*objfile
)
866 /* If we have not read psymbols, but we have a function capable of reading
867 them, then that is an indication that they are in fact available. Without
868 this function the symbols may have been already read in but they also may
869 not be present in this objfile. */
870 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
871 && objfile
->sf
->sym_read_psymbols
!= NULL
)
874 return objfile
->sf
->qf
->has_symbols (objfile
);
877 /* Return non-zero if OBJFILE has full symbols. */
880 objfile_has_full_symbols (struct objfile
*objfile
)
882 return objfile
->compunit_symtabs
!= NULL
;
885 /* Return non-zero if OBJFILE has full or partial symbols, either directly
886 or through a separate debug file. */
889 objfile_has_symbols (struct objfile
*objfile
)
891 for (::objfile
*o
: objfile
->separate_debug_objfiles ())
892 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
898 /* Many places in gdb want to test just to see if we have any partial
899 symbols available. This function returns zero if none are currently
900 available, nonzero otherwise. */
903 have_partial_symbols (void)
905 for (objfile
*ofp
: current_program_space
->objfiles ())
907 if (objfile_has_partial_symbols (ofp
))
913 /* Many places in gdb want to test just to see if we have any full
914 symbols available. This function returns zero if none are currently
915 available, nonzero otherwise. */
918 have_full_symbols (void)
920 for (objfile
*ofp
: current_program_space
->objfiles ())
922 if (objfile_has_full_symbols (ofp
))
929 /* This operations deletes all objfile entries that represent solibs that
930 weren't explicitly loaded by the user, via e.g., the add-symbol-file
934 objfile_purge_solibs (void)
936 for (objfile
*objf
: current_program_space
->objfiles_safe ())
938 /* We assume that the solib package has been purged already, or will
941 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
947 /* Many places in gdb want to test just to see if we have any minimal
948 symbols available. This function returns zero if none are currently
949 available, nonzero otherwise. */
952 have_minimal_symbols (void)
954 for (objfile
*ofp
: current_program_space
->objfiles ())
956 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
964 /* Qsort comparison function. */
967 sort_cmp (const struct obj_section
*sect1
, const obj_section
*sect2
)
969 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
970 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
972 if (sect1_addr
< sect2_addr
)
974 else if (sect1_addr
> sect2_addr
)
978 /* Sections are at the same address. This could happen if
979 A) we have an objfile and a separate debuginfo.
980 B) we are confused, and have added sections without proper relocation,
981 or something like that. */
983 const struct objfile
*const objfile1
= sect1
->objfile
;
984 const struct objfile
*const objfile2
= sect2
->objfile
;
986 if (objfile1
->separate_debug_objfile
== objfile2
987 || objfile2
->separate_debug_objfile
== objfile1
)
989 /* Case A. The ordering doesn't matter: separate debuginfo files
990 will be filtered out later. */
995 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
996 triage. This section could be slow (since we iterate over all
997 objfiles in each call to sort_cmp), but this shouldn't happen
998 very often (GDB is already in a confused state; one hopes this
999 doesn't happen at all). If you discover that significant time is
1000 spent in the loops below, do 'set complaints 100' and examine the
1001 resulting complaints. */
1002 if (objfile1
== objfile2
)
1004 /* Both sections came from the same objfile. We are really
1005 confused. Sort on sequence order of sections within the
1006 objfile. The order of checks is important here, if we find a
1007 match on SECT2 first then either SECT2 is before SECT1, or,
1008 SECT2 == SECT1, in both cases we should return false. The
1009 second case shouldn't occur during normal use, but std::sort
1010 does check that '!(a < a)' when compiled in debug mode. */
1012 const struct obj_section
*osect
;
1014 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1017 else if (osect
== sect1
)
1020 /* We should have found one of the sections before getting here. */
1021 gdb_assert_not_reached ("section not found");
1025 /* Sort on sequence number of the objfile in the chain. */
1027 for (objfile
*objfile
: current_program_space
->objfiles ())
1028 if (objfile
== objfile1
)
1030 else if (objfile
== objfile2
)
1033 /* We should have found one of the objfiles before getting here. */
1034 gdb_assert_not_reached ("objfile not found");
1039 gdb_assert_not_reached ("unexpected code path");
1043 /* Select "better" obj_section to keep. We prefer the one that came from
1044 the real object, rather than the one from separate debuginfo.
1045 Most of the time the two sections are exactly identical, but with
1046 prelinking the .rel.dyn section in the real object may have different
1049 static struct obj_section
*
1050 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1052 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1053 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1054 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1055 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1056 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1058 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1063 /* Return 1 if SECTION should be inserted into the section map.
1064 We want to insert only non-overlay and non-TLS section. */
1067 insert_section_p (const struct bfd
*abfd
,
1068 const struct bfd_section
*section
)
1070 const bfd_vma lma
= bfd_section_lma (section
);
1072 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (section
)
1073 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1074 /* This is an overlay section. IN_MEMORY check is needed to avoid
1075 discarding sections from the "system supplied DSO" (aka vdso)
1076 on some Linux systems (e.g. Fedora 11). */
1078 if ((bfd_section_flags (section
) & SEC_THREAD_LOCAL
) != 0)
1079 /* This is a TLS section. */
1085 /* Filter out overlapping sections where one section came from the real
1086 objfile, and the other from a separate debuginfo file.
1087 Return the size of table after redundant sections have been eliminated. */
1090 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1094 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1096 struct obj_section
*const sect1
= map
[i
];
1097 struct obj_section
*const sect2
= map
[i
+ 1];
1098 const struct objfile
*const objfile1
= sect1
->objfile
;
1099 const struct objfile
*const objfile2
= sect2
->objfile
;
1100 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1101 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1103 if (sect1_addr
== sect2_addr
1104 && (objfile1
->separate_debug_objfile
== objfile2
1105 || objfile2
->separate_debug_objfile
== objfile1
))
1107 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1116 gdb_assert (i
== map_size
- 1);
1120 /* The map should not have shrunk to less than half the original size. */
1121 gdb_assert (map_size
/ 2 <= j
);
1126 /* Filter out overlapping sections, issuing a warning if any are found.
1127 Overlapping sections could really be overlay sections which we didn't
1128 classify as such in insert_section_p, or we could be dealing with a
1132 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1136 for (i
= 0, j
= 0; i
< map_size
- 1; )
1141 for (k
= i
+ 1; k
< map_size
; k
++)
1143 struct obj_section
*const sect1
= map
[i
];
1144 struct obj_section
*const sect2
= map
[k
];
1145 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1146 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1147 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1149 gdb_assert (sect1_addr
<= sect2_addr
);
1151 if (sect1_endaddr
<= sect2_addr
)
1155 /* We have an overlap. Report it. */
1157 struct objfile
*const objf1
= sect1
->objfile
;
1158 struct objfile
*const objf2
= sect2
->objfile
;
1160 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1161 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1163 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1165 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1167 complaint (_("unexpected overlap between:\n"
1168 " (A) section `%s' from `%s' [%s, %s)\n"
1169 " (B) section `%s' from `%s' [%s, %s).\n"
1170 "Will ignore section B"),
1171 bfd_section_name (bfds1
), objfile_name (objf1
),
1172 paddress (gdbarch
, sect1_addr
),
1173 paddress (gdbarch
, sect1_endaddr
),
1174 bfd_section_name (bfds2
), objfile_name (objf2
),
1175 paddress (gdbarch
, sect2_addr
),
1176 paddress (gdbarch
, sect2_endaddr
));
1184 gdb_assert (i
== map_size
- 1);
1192 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1193 TLS, overlay and overlapping sections. */
1196 update_section_map (struct program_space
*pspace
,
1197 struct obj_section
***pmap
, int *pmap_size
)
1199 struct objfile_pspace_info
*pspace_info
;
1200 int alloc_size
, map_size
, i
;
1201 struct obj_section
*s
, **map
;
1203 pspace_info
= get_objfile_pspace_data (pspace
);
1204 gdb_assert (pspace_info
->section_map_dirty
!= 0
1205 || pspace_info
->new_objfiles_available
!= 0);
1211 for (objfile
*objfile
: pspace
->objfiles ())
1212 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1213 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1216 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1217 if (alloc_size
== 0)
1224 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1227 for (objfile
*objfile
: pspace
->objfiles ())
1228 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1229 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1232 std::sort (map
, map
+ alloc_size
, sort_cmp
);
1233 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1234 map_size
= filter_overlapping_sections(map
, map_size
);
1236 if (map_size
< alloc_size
)
1237 /* Some sections were eliminated. Trim excess space. */
1238 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1240 gdb_assert (alloc_size
== map_size
);
1243 *pmap_size
= map_size
;
1246 /* Bsearch comparison function. */
1249 bsearch_cmp (const void *key
, const void *elt
)
1251 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1252 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1254 if (pc
< obj_section_addr (section
))
1256 if (pc
< obj_section_endaddr (section
))
1261 /* Returns a section whose range includes PC or NULL if none found. */
1263 struct obj_section
*
1264 find_pc_section (CORE_ADDR pc
)
1266 struct objfile_pspace_info
*pspace_info
;
1267 struct obj_section
*s
, **sp
;
1269 /* Check for mapped overlay section first. */
1270 s
= find_pc_mapped_section (pc
);
1274 pspace_info
= get_objfile_pspace_data (current_program_space
);
1275 if (pspace_info
->section_map_dirty
1276 || (pspace_info
->new_objfiles_available
1277 && !pspace_info
->inhibit_updates
))
1279 update_section_map (current_program_space
,
1280 &pspace_info
->sections
,
1281 &pspace_info
->num_sections
);
1283 /* Don't need updates to section map until objfiles are added,
1284 removed or relocated. */
1285 pspace_info
->new_objfiles_available
= 0;
1286 pspace_info
->section_map_dirty
= 0;
1289 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1290 bsearch be non-NULL. */
1291 if (pspace_info
->sections
== NULL
)
1293 gdb_assert (pspace_info
->num_sections
== 0);
1297 sp
= (struct obj_section
**) bsearch (&pc
,
1298 pspace_info
->sections
,
1299 pspace_info
->num_sections
,
1300 sizeof (*pspace_info
->sections
),
1308 /* Return non-zero if PC is in a section called NAME. */
1311 pc_in_section (CORE_ADDR pc
, const char *name
)
1313 struct obj_section
*s
;
1316 s
= find_pc_section (pc
);
1319 && s
->the_bfd_section
->name
!= NULL
1320 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1325 /* Set section_map_dirty so section map will be rebuilt next time it
1326 is used. Called by reread_symbols. */
1329 objfiles_changed (void)
1331 /* Rebuild section map next time we need it. */
1332 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1335 /* See comments in objfiles.h. */
1337 scoped_restore_tmpl
<int>
1338 inhibit_section_map_updates (struct program_space
*pspace
)
1340 return scoped_restore_tmpl
<int>
1341 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1344 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1348 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1350 struct obj_section
*osect
;
1352 if (objfile
== NULL
)
1355 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1357 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1360 if (obj_section_addr (osect
) <= addr
1361 && addr
< obj_section_endaddr (osect
))
1368 shared_objfile_contains_address_p (struct program_space
*pspace
,
1371 for (objfile
*objfile
: pspace
->objfiles ())
1373 if ((objfile
->flags
& OBJF_SHARED
) != 0
1374 && is_addr_in_objfile (address
, objfile
))
1381 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1382 gdbarch method. It is equivalent to use the objfiles iterable,
1383 searching the objfiles in the order they are stored internally,
1384 ignoring CURRENT_OBJFILE.
1386 On most platforms, it should be close enough to doing the best
1387 we can without some knowledge specific to the architecture. */
1390 default_iterate_over_objfiles_in_search_order
1391 (struct gdbarch
*gdbarch
,
1392 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1393 void *cb_data
, struct objfile
*current_objfile
)
1397 for (objfile
*objfile
: current_program_space
->objfiles ())
1399 stop
= cb (objfile
, cb_data
);
1405 /* See objfiles.h. */
1408 objfile_name (const struct objfile
*objfile
)
1410 if (objfile
->obfd
!= NULL
)
1411 return bfd_get_filename (objfile
->obfd
);
1413 return objfile
->original_name
;
1416 /* See objfiles.h. */
1419 objfile_filename (const struct objfile
*objfile
)
1421 if (objfile
->obfd
!= NULL
)
1422 return bfd_get_filename (objfile
->obfd
);
1427 /* See objfiles.h. */
1430 objfile_debug_name (const struct objfile
*objfile
)
1432 return lbasename (objfile
->original_name
);
1435 /* See objfiles.h. */
1438 objfile_flavour_name (struct objfile
*objfile
)
1440 if (objfile
->obfd
!= NULL
)
1441 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));