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 "common/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 struct obj_section
**sections
;
72 /* Nonzero if object files have been added since the section map
74 int new_objfiles_available
;
76 /* Nonzero if the section map MUST be updated before use. */
77 int section_map_dirty
;
79 /* Nonzero if section map updates should be inhibited if possible. */
83 /* Per-program-space data key. */
84 static const struct program_space_data
*objfiles_pspace_data
;
87 objfiles_pspace_data_cleanup (struct program_space
*pspace
, void *arg
)
89 struct objfile_pspace_info
*info
= (struct objfile_pspace_info
*) arg
;
91 xfree (info
->sections
);
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
= ((struct objfile_pspace_info
*)
104 program_space_data (pspace
, objfiles_pspace_data
));
107 info
= XCNEW (struct objfile_pspace_info
);
108 set_program_space_data (pspace
, objfiles_pspace_data
, info
);
116 /* Per-BFD data key. */
118 static const struct bfd_data
*objfiles_bfd_data
;
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. If ABFD is not
123 NULL, the object is allocated on the BFD; otherwise it is allocated
124 on OBJFILE's obstack. Note that it is not safe to call this
125 multiple times for a given OBJFILE -- it can only be called when
126 allocating or re-initializing OBJFILE. */
128 static struct objfile_per_bfd_storage
*
129 get_objfile_bfd_data (struct objfile
*objfile
, struct bfd
*abfd
)
131 struct objfile_per_bfd_storage
*storage
= NULL
;
134 storage
= ((struct objfile_per_bfd_storage
*)
135 bfd_data (abfd
, objfiles_bfd_data
));
139 /* If the object requires gdb to do relocations, we simply fall
140 back to not sharing data across users. These cases are rare
141 enough that this seems reasonable. */
142 if (abfd
!= NULL
&& !gdb_bfd_requires_relocations (abfd
))
145 = ((struct objfile_per_bfd_storage
*)
146 bfd_alloc (abfd
, sizeof (struct objfile_per_bfd_storage
)));
147 /* objfile_per_bfd_storage is not trivially constructible, must
148 call the ctor manually. */
149 storage
= new (storage
) objfile_per_bfd_storage ();
150 set_bfd_data (abfd
, objfiles_bfd_data
, storage
);
154 = obstack_new
<objfile_per_bfd_storage
> (&objfile
->objfile_obstack
);
156 /* Look up the gdbarch associated with the BFD. */
158 storage
->gdbarch
= gdbarch_from_bfd (abfd
);
160 storage
->language_of_main
= language_unknown
;
169 free_objfile_per_bfd_storage (struct objfile_per_bfd_storage
*storage
)
171 if (storage
->demangled_names_hash
)
172 htab_delete (storage
->demangled_names_hash
);
173 storage
->~objfile_per_bfd_storage ();
176 /* A wrapper for free_objfile_per_bfd_storage that can be passed as a
177 cleanup function to the BFD registry. */
180 objfile_bfd_data_free (struct bfd
*unused
, void *d
)
182 free_objfile_per_bfd_storage ((struct objfile_per_bfd_storage
*) d
);
185 /* See objfiles.h. */
188 set_objfile_per_bfd (struct objfile
*objfile
)
190 objfile
->per_bfd
= get_objfile_bfd_data (objfile
, objfile
->obfd
);
193 /* Set the objfile's per-BFD notion of the "main" name and
197 set_objfile_main_name (struct objfile
*objfile
,
198 const char *name
, enum language lang
)
200 if (objfile
->per_bfd
->name_of_main
== NULL
201 || strcmp (objfile
->per_bfd
->name_of_main
, name
) != 0)
202 objfile
->per_bfd
->name_of_main
203 = (const char *) obstack_copy0 (&objfile
->per_bfd
->storage_obstack
, name
,
205 objfile
->per_bfd
->language_of_main
= lang
;
208 /* Helper structure to map blocks to static link properties in hash tables. */
210 struct static_link_htab_entry
212 const struct block
*block
;
213 const struct dynamic_prop
*static_link
;
216 /* Return a hash code for struct static_link_htab_entry *P. */
219 static_link_htab_entry_hash (const void *p
)
221 const struct static_link_htab_entry
*e
222 = (const struct static_link_htab_entry
*) p
;
224 return htab_hash_pointer (e
->block
);
227 /* Return whether P1 an P2 (pointers to struct static_link_htab_entry) are
228 mappings for the same block. */
231 static_link_htab_entry_eq (const void *p1
, const void *p2
)
233 const struct static_link_htab_entry
*e1
234 = (const struct static_link_htab_entry
*) p1
;
235 const struct static_link_htab_entry
*e2
236 = (const struct static_link_htab_entry
*) p2
;
238 return e1
->block
== e2
->block
;
241 /* Register STATIC_LINK as the static link for BLOCK, which is part of OBJFILE.
242 Must not be called more than once for each BLOCK. */
245 objfile_register_static_link (struct objfile
*objfile
,
246 const struct block
*block
,
247 const struct dynamic_prop
*static_link
)
250 struct static_link_htab_entry lookup_entry
;
251 struct static_link_htab_entry
*entry
;
253 if (objfile
->static_links
== NULL
)
254 objfile
->static_links
= htab_create_alloc
255 (1, &static_link_htab_entry_hash
, static_link_htab_entry_eq
, NULL
,
258 /* Create a slot for the mapping, make sure it's the first mapping for this
259 block and then create the mapping itself. */
260 lookup_entry
.block
= block
;
261 slot
= htab_find_slot (objfile
->static_links
, &lookup_entry
, INSERT
);
262 gdb_assert (*slot
== NULL
);
264 entry
= XOBNEW (&objfile
->objfile_obstack
, static_link_htab_entry
);
265 entry
->block
= block
;
266 entry
->static_link
= static_link
;
267 *slot
= (void *) entry
;
270 /* Look for a static link for BLOCK, which is part of OBJFILE. Return NULL if
273 const struct dynamic_prop
*
274 objfile_lookup_static_link (struct objfile
*objfile
,
275 const struct block
*block
)
277 struct static_link_htab_entry
*entry
;
278 struct static_link_htab_entry lookup_entry
;
280 if (objfile
->static_links
== NULL
)
282 lookup_entry
.block
= block
;
284 = (struct static_link_htab_entry
*) htab_find (objfile
->static_links
,
289 gdb_assert (entry
->block
== block
);
290 return entry
->static_link
;
295 /* Called via bfd_map_over_sections to build up the section table that
296 the objfile references. The objfile contains pointers to the start
297 of the table (objfile->sections) and to the first location after
298 the end of the table (objfile->sections_end). */
301 add_to_objfile_sections_full (struct bfd
*abfd
, struct bfd_section
*asect
,
302 struct objfile
*objfile
, int force
)
304 struct obj_section
*section
;
310 aflag
= bfd_get_section_flags (abfd
, asect
);
311 if (!(aflag
& SEC_ALLOC
))
315 section
= &objfile
->sections
[gdb_bfd_section_index (abfd
, asect
)];
316 section
->objfile
= objfile
;
317 section
->the_bfd_section
= asect
;
318 section
->ovly_mapped
= 0;
322 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
325 add_to_objfile_sections_full (abfd
, asect
, (struct objfile
*) objfilep
, 0);
328 /* Builds a section table for OBJFILE.
330 Note that the OFFSET and OVLY_MAPPED in each table entry are
331 initialized to zero. */
334 build_objfile_section_table (struct objfile
*objfile
)
336 int count
= gdb_bfd_count_sections (objfile
->obfd
);
338 objfile
->sections
= OBSTACK_CALLOC (&objfile
->objfile_obstack
,
341 objfile
->sections_end
= (objfile
->sections
+ count
);
342 bfd_map_over_sections (objfile
->obfd
,
343 add_to_objfile_sections
, (void *) objfile
);
345 /* See gdb_bfd_section_index. */
346 add_to_objfile_sections_full (objfile
->obfd
, bfd_com_section_ptr
, objfile
, 1);
347 add_to_objfile_sections_full (objfile
->obfd
, bfd_und_section_ptr
, objfile
, 1);
348 add_to_objfile_sections_full (objfile
->obfd
, bfd_abs_section_ptr
, objfile
, 1);
349 add_to_objfile_sections_full (objfile
->obfd
, bfd_ind_section_ptr
, objfile
, 1);
352 /* Given a pointer to an initialized bfd (ABFD) and some flag bits,
353 initialize the new objfile as best we can and link it into the list
354 of all known objfiles.
356 NAME should contain original non-canonicalized filename or other
357 identifier as entered by user. If there is no better source use
358 bfd_get_filename (ABFD). NAME may be NULL only if ABFD is NULL.
359 NAME content is copied into returned objfile.
361 The FLAGS word contains various bits (OBJF_*) that can be taken as
362 requests for specific operations. Other bits like OBJF_SHARED are
363 simply copied through to the new objfile flags member. */
365 objfile::objfile (bfd
*abfd
, const char *name
, objfile_flags flags_
)
367 pspace (current_program_space
),
368 partial_symtabs (new psymtab_storage ()),
371 const char *expanded_name
;
373 /* We could use obstack_specify_allocation here instead, but
374 gdb_obstack.h specifies the alloc/dealloc functions. */
375 obstack_init (&objfile_obstack
);
377 objfile_alloc_data (this);
379 gdb::unique_xmalloc_ptr
<char> name_holder
;
382 gdb_assert (abfd
== NULL
);
383 gdb_assert ((flags
& OBJF_NOT_FILENAME
) != 0);
384 expanded_name
= "<<anonymous objfile>>";
386 else if ((flags
& OBJF_NOT_FILENAME
) != 0
387 || is_target_filename (name
))
388 expanded_name
= name
;
391 name_holder
= gdb_abspath (name
);
392 expanded_name
= name_holder
.get ();
395 = (char *) obstack_copy0 (&objfile_obstack
,
397 strlen (expanded_name
));
399 /* Update the per-objfile information that comes from the bfd, ensuring
400 that any data that is reference is saved in the per-objfile data
406 mtime
= bfd_get_mtime (abfd
);
408 /* Build section table. */
409 build_objfile_section_table (this);
412 per_bfd
= get_objfile_bfd_data (this, abfd
);
414 terminate_minimal_symbol_table (this);
416 /* Add this file onto the tail of the linked list of other such files. */
418 if (object_files
== NULL
)
422 struct objfile
*last_one
;
424 for (last_one
= object_files
;
426 last_one
= last_one
->next
);
427 last_one
->next
= this;
430 /* Rebuild section map next time we need it. */
431 get_objfile_pspace_data (pspace
)->new_objfiles_available
= 1;
434 /* Retrieve the gdbarch associated with OBJFILE. */
437 get_objfile_arch (const struct objfile
*objfile
)
439 return objfile
->per_bfd
->gdbarch
;
442 /* If there is a valid and known entry point, function fills *ENTRY_P with it
443 and returns non-zero; otherwise it returns zero. */
446 entry_point_address_query (CORE_ADDR
*entry_p
)
448 if (symfile_objfile
== NULL
|| !symfile_objfile
->per_bfd
->ei
.entry_point_p
)
451 *entry_p
= (symfile_objfile
->per_bfd
->ei
.entry_point
452 + ANOFFSET (symfile_objfile
->section_offsets
,
453 symfile_objfile
->per_bfd
->ei
.the_bfd_section_index
));
458 /* Get current entry point address. Call error if it is not known. */
461 entry_point_address (void)
465 if (!entry_point_address_query (&retval
))
466 error (_("Entry point address is not known."));
471 /* Iterator on PARENT and every separate debug objfile of PARENT.
472 The usage pattern is:
473 for (objfile = parent;
475 objfile = objfile_separate_debug_iterate (parent, objfile))
480 objfile_separate_debug_iterate (const struct objfile
*parent
,
481 const struct objfile
*objfile
)
485 /* If any, return the first child. */
486 res
= objfile
->separate_debug_objfile
;
490 /* Common case where there is no separate debug objfile. */
491 if (objfile
== parent
)
494 /* Return the brother if any. Note that we don't iterate on brothers of
496 res
= objfile
->separate_debug_objfile_link
;
500 for (res
= objfile
->separate_debug_objfile_backlink
;
502 res
= res
->separate_debug_objfile_backlink
)
504 gdb_assert (res
!= NULL
);
505 if (res
->separate_debug_objfile_link
)
506 return res
->separate_debug_objfile_link
;
511 /* Put one object file before a specified on in the global list.
512 This can be used to make sure an object file is destroyed before
513 another when using objfiles_safe to free all objfiles. */
515 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
517 struct objfile
**objp
;
519 unlink_objfile (objfile
);
521 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
523 if (*objp
== before_this
)
525 objfile
->next
= *objp
;
531 internal_error (__FILE__
, __LINE__
,
532 _("put_objfile_before: before objfile not in list"));
535 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
538 It is not a bug, or error, to call this function if OBJFILE is not known
539 to be in the current list. This is done in the case of mapped objfiles,
540 for example, just to ensure that the mapped objfile doesn't appear twice
541 in the list. Since the list is threaded, linking in a mapped objfile
542 twice would create a circular list.
544 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
545 unlinking it, just to ensure that we have completely severed any linkages
546 between the OBJFILE and the list. */
549 unlink_objfile (struct objfile
*objfile
)
551 struct objfile
**objpp
;
553 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
555 if (*objpp
== objfile
)
557 *objpp
= (*objpp
)->next
;
558 objfile
->next
= NULL
;
563 internal_error (__FILE__
, __LINE__
,
564 _("unlink_objfile: objfile already unlinked"));
567 /* Add OBJFILE as a separate debug objfile of PARENT. */
570 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
572 gdb_assert (objfile
&& parent
);
574 /* Must not be already in a list. */
575 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
576 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
577 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
578 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
579 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
581 objfile
->separate_debug_objfile_backlink
= parent
;
582 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
583 parent
->separate_debug_objfile
= objfile
;
585 /* Put the separate debug object before the normal one, this is so that
586 usage of objfiles_safe will stay safe. */
587 put_objfile_before (objfile
, parent
);
590 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
594 free_objfile_separate_debug (struct objfile
*objfile
)
596 struct objfile
*child
;
598 for (child
= objfile
->separate_debug_objfile
; child
;)
600 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
606 /* Destroy an objfile and all the symtabs and psymtabs under it. */
610 /* First notify observers that this objfile is about to be freed. */
611 gdb::observers::free_objfile
.notify (this);
613 /* Free all separate debug objfiles. */
614 free_objfile_separate_debug (this);
616 if (separate_debug_objfile_backlink
)
618 /* We freed the separate debug file, make sure the base objfile
619 doesn't reference it. */
620 struct objfile
*child
;
622 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
626 /* THIS is the first child. */
627 separate_debug_objfile_backlink
->separate_debug_objfile
=
628 separate_debug_objfile_link
;
632 /* Find THIS in the list. */
635 if (child
->separate_debug_objfile_link
== this)
637 child
->separate_debug_objfile_link
=
638 separate_debug_objfile_link
;
641 child
= child
->separate_debug_objfile_link
;
647 /* Remove any references to this objfile in the global value
649 preserve_values (this);
651 /* It still may reference data modules have associated with the objfile and
652 the symbol file data. */
653 forget_cached_source_info_for_objfile (this);
655 breakpoint_free_objfile (this);
656 btrace_free_objfile (this);
658 /* First do any symbol file specific actions required when we are
659 finished with a particular symbol file. Note that if the objfile
660 is using reusable symbol information (via mmalloc) then each of
661 these routines is responsible for doing the correct thing, either
662 freeing things which are valid only during this particular gdb
663 execution, or leaving them to be reused during the next one. */
666 (*sf
->sym_finish
) (this);
668 /* Discard any data modules have associated with the objfile. The function
669 still may reference obfd. */
670 objfile_free_data (this);
673 gdb_bfd_unref (obfd
);
675 free_objfile_per_bfd_storage (per_bfd
);
677 /* Remove it from the chain of all objfiles. */
679 unlink_objfile (this);
681 if (this == symfile_objfile
)
682 symfile_objfile
= NULL
;
684 /* Before the symbol table code was redone to make it easier to
685 selectively load and remove information particular to a specific
686 linkage unit, gdb used to do these things whenever the monolithic
687 symbol table was blown away. How much still needs to be done
688 is unknown, but we play it safe for now and keep each action until
689 it is shown to be no longer needed. */
691 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
692 for example), so we need to call this here. */
693 clear_pc_function_cache ();
695 /* Clear globals which might have pointed into a removed objfile.
696 FIXME: It's not clear which of these are supposed to persist
697 between expressions and which ought to be reset each time. */
698 expression_context_block
= NULL
;
699 innermost_block
.reset ();
701 /* Check to see if the current_source_symtab belongs to this objfile,
702 and if so, call clear_current_source_symtab_and_line. */
705 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
707 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
708 clear_current_source_symtab_and_line ();
711 /* Free the obstacks for non-reusable objfiles. */
712 obstack_free (&objfile_obstack
, 0);
714 /* Rebuild section map next time we need it. */
715 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
717 /* Free the map for static links. There's no need to free static link
718 themselves since they were allocated on the objstack. */
719 if (static_links
!= NULL
)
720 htab_delete (static_links
);
723 /* Free all the object files at once and clean up their users. */
726 free_all_objfiles (void)
730 /* Any objfile referencewould become stale. */
731 for (so
= master_so_list (); so
; so
= so
->next
)
732 gdb_assert (so
->objfile
== NULL
);
734 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
736 clear_symtab_users (0);
739 /* A helper function for objfile_relocate1 that relocates a single
743 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
744 struct section_offsets
*delta
)
746 fixup_symbol_section (sym
, objfile
);
748 /* The RS6000 code from which this was taken skipped
749 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
750 But I'm leaving out that test, on the theory that
751 they can't possibly pass the tests below. */
752 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
753 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
754 && SYMBOL_SECTION (sym
) >= 0)
756 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
760 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
761 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
762 Return non-zero iff any change happened. */
765 objfile_relocate1 (struct objfile
*objfile
,
766 const struct section_offsets
*new_offsets
)
768 struct section_offsets
*delta
=
769 ((struct section_offsets
*)
770 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
772 int something_changed
= 0;
774 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
777 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
778 if (ANOFFSET (delta
, i
) != 0)
779 something_changed
= 1;
781 if (!something_changed
)
784 /* OK, get all the symtabs. */
786 for (compunit_symtab
*cust
: objfile
->compunits ())
788 for (symtab
*s
: compunit_filetabs (cust
))
792 /* First the line table. */
793 l
= SYMTAB_LINETABLE (s
);
796 for (int i
= 0; i
< l
->nitems
; ++i
)
797 l
->item
[i
].pc
+= ANOFFSET (delta
,
798 COMPUNIT_BLOCK_LINE_SECTION
804 for (compunit_symtab
*cust
: objfile
->compunits ())
806 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
807 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
809 if (BLOCKVECTOR_MAP (bv
))
810 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
811 ANOFFSET (delta
, block_line_section
));
813 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
817 struct mdict_iterator miter
;
819 b
= BLOCKVECTOR_BLOCK (bv
, i
);
820 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
821 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
823 if (BLOCK_RANGES (b
) != nullptr)
824 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
826 BLOCK_RANGE_START (b
, j
)
827 += ANOFFSET (delta
, block_line_section
);
828 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
832 /* We only want to iterate over the local symbols, not any
833 symbols in included symtabs. */
834 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
836 relocate_one_symbol (sym
, objfile
, delta
);
842 /* This stores relocated addresses and so must be cleared. This
843 will cause it to be recreated on demand. */
844 objfile
->psymbol_map
.clear ();
846 /* Relocate isolated symbols. */
850 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
851 relocate_one_symbol (iter
, objfile
, delta
);
857 for (i
= 0; i
< objfile
->num_sections
; ++i
)
858 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
861 /* Rebuild section map next time we need it. */
862 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
864 /* Update the table in exec_ops, used to read memory. */
865 struct obj_section
*s
;
866 ALL_OBJFILE_OSECTIONS (objfile
, s
)
868 int idx
= s
- objfile
->sections
;
870 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
871 obj_section_addr (s
));
878 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
879 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
881 The number and ordering of sections does differ between the two objfiles.
882 Only their names match. Also the file offsets will differ (objfile being
883 possibly prelinked but separate_debug_objfile is probably not prelinked) but
884 the in-memory absolute address as specified by NEW_OFFSETS must match both
888 objfile_relocate (struct objfile
*objfile
,
889 const struct section_offsets
*new_offsets
)
891 struct objfile
*debug_objfile
;
894 changed
|= objfile_relocate1 (objfile
, new_offsets
);
896 for (debug_objfile
= objfile
->separate_debug_objfile
;
898 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
900 section_addr_info objfile_addrs
901 = build_section_addr_info_from_objfile (objfile
);
903 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
904 relative ones must be already created according to debug_objfile. */
906 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
908 gdb_assert (debug_objfile
->num_sections
909 == gdb_bfd_count_sections (debug_objfile
->obfd
));
910 std::vector
<struct section_offsets
>
911 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
912 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
913 debug_objfile
->num_sections
,
916 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
919 /* Relocate breakpoints as necessary, after things are relocated. */
921 breakpoint_re_set ();
924 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
926 Return non-zero iff any change happened. */
929 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
931 struct section_offsets
*new_offsets
=
932 ((struct section_offsets
*)
933 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
936 for (i
= 0; i
< objfile
->num_sections
; ++i
)
937 new_offsets
->offsets
[i
] = slide
;
939 return objfile_relocate1 (objfile
, new_offsets
);
942 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
943 SEPARATE_DEBUG_OBJFILEs. */
946 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
948 struct objfile
*debug_objfile
;
951 changed
|= objfile_rebase1 (objfile
, slide
);
953 for (debug_objfile
= objfile
->separate_debug_objfile
;
955 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
956 changed
|= objfile_rebase1 (debug_objfile
, slide
);
958 /* Relocate breakpoints as necessary, after things are relocated. */
960 breakpoint_re_set ();
963 /* Return non-zero if OBJFILE has partial symbols. */
966 objfile_has_partial_symbols (struct objfile
*objfile
)
971 /* If we have not read psymbols, but we have a function capable of reading
972 them, then that is an indication that they are in fact available. Without
973 this function the symbols may have been already read in but they also may
974 not be present in this objfile. */
975 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
976 && objfile
->sf
->sym_read_psymbols
!= NULL
)
979 return objfile
->sf
->qf
->has_symbols (objfile
);
982 /* Return non-zero if OBJFILE has full symbols. */
985 objfile_has_full_symbols (struct objfile
*objfile
)
987 return objfile
->compunit_symtabs
!= NULL
;
990 /* Return non-zero if OBJFILE has full or partial symbols, either directly
991 or through a separate debug file. */
994 objfile_has_symbols (struct objfile
*objfile
)
998 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
999 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
1005 /* Many places in gdb want to test just to see if we have any partial
1006 symbols available. This function returns zero if none are currently
1007 available, nonzero otherwise. */
1010 have_partial_symbols (void)
1012 for (objfile
*ofp
: current_program_space
->objfiles ())
1014 if (objfile_has_partial_symbols (ofp
))
1020 /* Many places in gdb want to test just to see if we have any full
1021 symbols available. This function returns zero if none are currently
1022 available, nonzero otherwise. */
1025 have_full_symbols (void)
1027 for (objfile
*ofp
: current_program_space
->objfiles ())
1029 if (objfile_has_full_symbols (ofp
))
1036 /* This operations deletes all objfile entries that represent solibs that
1037 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1041 objfile_purge_solibs (void)
1043 for (objfile
*objf
: current_program_space
->objfiles_safe ())
1045 /* We assume that the solib package has been purged already, or will
1048 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1054 /* Many places in gdb want to test just to see if we have any minimal
1055 symbols available. This function returns zero if none are currently
1056 available, nonzero otherwise. */
1059 have_minimal_symbols (void)
1061 for (objfile
*ofp
: current_program_space
->objfiles ())
1063 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
1071 /* Qsort comparison function. */
1074 qsort_cmp (const void *a
, const void *b
)
1076 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1077 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1078 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1079 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1081 if (sect1_addr
< sect2_addr
)
1083 else if (sect1_addr
> sect2_addr
)
1087 /* Sections are at the same address. This could happen if
1088 A) we have an objfile and a separate debuginfo.
1089 B) we are confused, and have added sections without proper relocation,
1090 or something like that. */
1092 const struct objfile
*const objfile1
= sect1
->objfile
;
1093 const struct objfile
*const objfile2
= sect2
->objfile
;
1095 if (objfile1
->separate_debug_objfile
== objfile2
1096 || objfile2
->separate_debug_objfile
== objfile1
)
1098 /* Case A. The ordering doesn't matter: separate debuginfo files
1099 will be filtered out later. */
1104 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1105 triage. This section could be slow (since we iterate over all
1106 objfiles in each call to qsort_cmp), but this shouldn't happen
1107 very often (GDB is already in a confused state; one hopes this
1108 doesn't happen at all). If you discover that significant time is
1109 spent in the loops below, do 'set complaints 100' and examine the
1110 resulting complaints. */
1112 if (objfile1
== objfile2
)
1114 /* Both sections came from the same objfile. We are really confused.
1115 Sort on sequence order of sections within the objfile. */
1117 const struct obj_section
*osect
;
1119 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1122 else if (osect
== sect2
)
1125 /* We should have found one of the sections before getting here. */
1126 gdb_assert_not_reached ("section not found");
1130 /* Sort on sequence number of the objfile in the chain. */
1132 for (objfile
*objfile
: current_program_space
->objfiles ())
1133 if (objfile
== objfile1
)
1135 else if (objfile
== objfile2
)
1138 /* We should have found one of the objfiles before getting here. */
1139 gdb_assert_not_reached ("objfile not found");
1144 gdb_assert_not_reached ("unexpected code path");
1148 /* Select "better" obj_section to keep. We prefer the one that came from
1149 the real object, rather than the one from separate debuginfo.
1150 Most of the time the two sections are exactly identical, but with
1151 prelinking the .rel.dyn section in the real object may have different
1154 static struct obj_section
*
1155 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1157 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1158 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1159 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1160 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1161 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1163 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1168 /* Return 1 if SECTION should be inserted into the section map.
1169 We want to insert only non-overlay and non-TLS section. */
1172 insert_section_p (const struct bfd
*abfd
,
1173 const struct bfd_section
*section
)
1175 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1177 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1178 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1179 /* This is an overlay section. IN_MEMORY check is needed to avoid
1180 discarding sections from the "system supplied DSO" (aka vdso)
1181 on some Linux systems (e.g. Fedora 11). */
1183 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1184 /* This is a TLS section. */
1190 /* Filter out overlapping sections where one section came from the real
1191 objfile, and the other from a separate debuginfo file.
1192 Return the size of table after redundant sections have been eliminated. */
1195 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1199 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1201 struct obj_section
*const sect1
= map
[i
];
1202 struct obj_section
*const sect2
= map
[i
+ 1];
1203 const struct objfile
*const objfile1
= sect1
->objfile
;
1204 const struct objfile
*const objfile2
= sect2
->objfile
;
1205 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1206 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1208 if (sect1_addr
== sect2_addr
1209 && (objfile1
->separate_debug_objfile
== objfile2
1210 || objfile2
->separate_debug_objfile
== objfile1
))
1212 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1221 gdb_assert (i
== map_size
- 1);
1225 /* The map should not have shrunk to less than half the original size. */
1226 gdb_assert (map_size
/ 2 <= j
);
1231 /* Filter out overlapping sections, issuing a warning if any are found.
1232 Overlapping sections could really be overlay sections which we didn't
1233 classify as such in insert_section_p, or we could be dealing with a
1237 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1241 for (i
= 0, j
= 0; i
< map_size
- 1; )
1246 for (k
= i
+ 1; k
< map_size
; k
++)
1248 struct obj_section
*const sect1
= map
[i
];
1249 struct obj_section
*const sect2
= map
[k
];
1250 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1251 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1252 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1254 gdb_assert (sect1_addr
<= sect2_addr
);
1256 if (sect1_endaddr
<= sect2_addr
)
1260 /* We have an overlap. Report it. */
1262 struct objfile
*const objf1
= sect1
->objfile
;
1263 struct objfile
*const objf2
= sect2
->objfile
;
1265 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1266 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1268 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1270 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1272 complaint (_("unexpected overlap between:\n"
1273 " (A) section `%s' from `%s' [%s, %s)\n"
1274 " (B) section `%s' from `%s' [%s, %s).\n"
1275 "Will ignore section B"),
1276 bfd_section_name (abfd1
, bfds1
), objfile_name (objf1
),
1277 paddress (gdbarch
, sect1_addr
),
1278 paddress (gdbarch
, sect1_endaddr
),
1279 bfd_section_name (abfd2
, bfds2
), objfile_name (objf2
),
1280 paddress (gdbarch
, sect2_addr
),
1281 paddress (gdbarch
, sect2_endaddr
));
1289 gdb_assert (i
== map_size
- 1);
1297 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1298 TLS, overlay and overlapping sections. */
1301 update_section_map (struct program_space
*pspace
,
1302 struct obj_section
***pmap
, int *pmap_size
)
1304 struct objfile_pspace_info
*pspace_info
;
1305 int alloc_size
, map_size
, i
;
1306 struct obj_section
*s
, **map
;
1308 pspace_info
= get_objfile_pspace_data (pspace
);
1309 gdb_assert (pspace_info
->section_map_dirty
!= 0
1310 || pspace_info
->new_objfiles_available
!= 0);
1316 for (objfile
*objfile
: pspace
->objfiles ())
1317 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1318 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1321 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1322 if (alloc_size
== 0)
1329 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1332 for (objfile
*objfile
: pspace
->objfiles ())
1333 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1334 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1337 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1338 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1339 map_size
= filter_overlapping_sections(map
, map_size
);
1341 if (map_size
< alloc_size
)
1342 /* Some sections were eliminated. Trim excess space. */
1343 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1345 gdb_assert (alloc_size
== map_size
);
1348 *pmap_size
= map_size
;
1351 /* Bsearch comparison function. */
1354 bsearch_cmp (const void *key
, const void *elt
)
1356 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1357 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1359 if (pc
< obj_section_addr (section
))
1361 if (pc
< obj_section_endaddr (section
))
1366 /* Returns a section whose range includes PC or NULL if none found. */
1368 struct obj_section
*
1369 find_pc_section (CORE_ADDR pc
)
1371 struct objfile_pspace_info
*pspace_info
;
1372 struct obj_section
*s
, **sp
;
1374 /* Check for mapped overlay section first. */
1375 s
= find_pc_mapped_section (pc
);
1379 pspace_info
= get_objfile_pspace_data (current_program_space
);
1380 if (pspace_info
->section_map_dirty
1381 || (pspace_info
->new_objfiles_available
1382 && !pspace_info
->inhibit_updates
))
1384 update_section_map (current_program_space
,
1385 &pspace_info
->sections
,
1386 &pspace_info
->num_sections
);
1388 /* Don't need updates to section map until objfiles are added,
1389 removed or relocated. */
1390 pspace_info
->new_objfiles_available
= 0;
1391 pspace_info
->section_map_dirty
= 0;
1394 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1395 bsearch be non-NULL. */
1396 if (pspace_info
->sections
== NULL
)
1398 gdb_assert (pspace_info
->num_sections
== 0);
1402 sp
= (struct obj_section
**) bsearch (&pc
,
1403 pspace_info
->sections
,
1404 pspace_info
->num_sections
,
1405 sizeof (*pspace_info
->sections
),
1413 /* Return non-zero if PC is in a section called NAME. */
1416 pc_in_section (CORE_ADDR pc
, const char *name
)
1418 struct obj_section
*s
;
1421 s
= find_pc_section (pc
);
1424 && s
->the_bfd_section
->name
!= NULL
1425 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1430 /* Set section_map_dirty so section map will be rebuilt next time it
1431 is used. Called by reread_symbols. */
1434 objfiles_changed (void)
1436 /* Rebuild section map next time we need it. */
1437 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1440 /* See comments in objfiles.h. */
1442 scoped_restore_tmpl
<int>
1443 inhibit_section_map_updates (struct program_space
*pspace
)
1445 return scoped_restore_tmpl
<int>
1446 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1449 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1453 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1455 struct obj_section
*osect
;
1457 if (objfile
== NULL
)
1460 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1462 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1465 if (obj_section_addr (osect
) <= addr
1466 && addr
< obj_section_endaddr (osect
))
1473 shared_objfile_contains_address_p (struct program_space
*pspace
,
1476 for (objfile
*objfile
: pspace
->objfiles ())
1478 if ((objfile
->flags
& OBJF_SHARED
) != 0
1479 && is_addr_in_objfile (address
, objfile
))
1486 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1487 gdbarch method. It is equivalent to use the objfiles iterable,
1488 searching the objfiles in the order they are stored internally,
1489 ignoring CURRENT_OBJFILE.
1491 On most platorms, it should be close enough to doing the best
1492 we can without some knowledge specific to the architecture. */
1495 default_iterate_over_objfiles_in_search_order
1496 (struct gdbarch
*gdbarch
,
1497 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1498 void *cb_data
, struct objfile
*current_objfile
)
1502 for (objfile
*objfile
: current_program_space
->objfiles ())
1504 stop
= cb (objfile
, cb_data
);
1510 /* See objfiles.h. */
1513 objfile_name (const struct objfile
*objfile
)
1515 if (objfile
->obfd
!= NULL
)
1516 return bfd_get_filename (objfile
->obfd
);
1518 return objfile
->original_name
;
1521 /* See objfiles.h. */
1524 objfile_filename (const struct objfile
*objfile
)
1526 if (objfile
->obfd
!= NULL
)
1527 return bfd_get_filename (objfile
->obfd
);
1532 /* See objfiles.h. */
1535 objfile_debug_name (const struct objfile
*objfile
)
1537 return lbasename (objfile
->original_name
);
1540 /* See objfiles.h. */
1543 objfile_flavour_name (struct objfile
*objfile
)
1545 if (objfile
->obfd
!= NULL
)
1546 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));
1551 _initialize_objfiles (void)
1553 objfiles_pspace_data
1554 = register_program_space_data_with_cleanup (NULL
,
1555 objfiles_pspace_data_cleanup
);
1557 objfiles_bfd_data
= register_bfd_data_with_cleanup (NULL
,
1558 objfile_bfd_data_free
);