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 /* Add this file onto the tail of the linked list of other such files. */
416 if (object_files
== NULL
)
420 struct objfile
*last_one
;
422 for (last_one
= object_files
;
424 last_one
= last_one
->next
);
425 last_one
->next
= this;
428 /* Rebuild section map next time we need it. */
429 get_objfile_pspace_data (pspace
)->new_objfiles_available
= 1;
432 /* Retrieve the gdbarch associated with OBJFILE. */
435 get_objfile_arch (const struct objfile
*objfile
)
437 return objfile
->per_bfd
->gdbarch
;
440 /* If there is a valid and known entry point, function fills *ENTRY_P with it
441 and returns non-zero; otherwise it returns zero. */
444 entry_point_address_query (CORE_ADDR
*entry_p
)
446 if (symfile_objfile
== NULL
|| !symfile_objfile
->per_bfd
->ei
.entry_point_p
)
449 *entry_p
= (symfile_objfile
->per_bfd
->ei
.entry_point
450 + ANOFFSET (symfile_objfile
->section_offsets
,
451 symfile_objfile
->per_bfd
->ei
.the_bfd_section_index
));
456 /* Get current entry point address. Call error if it is not known. */
459 entry_point_address (void)
463 if (!entry_point_address_query (&retval
))
464 error (_("Entry point address is not known."));
469 /* Iterator on PARENT and every separate debug objfile of PARENT.
470 The usage pattern is:
471 for (objfile = parent;
473 objfile = objfile_separate_debug_iterate (parent, objfile))
478 objfile_separate_debug_iterate (const struct objfile
*parent
,
479 const struct objfile
*objfile
)
483 /* If any, return the first child. */
484 res
= objfile
->separate_debug_objfile
;
488 /* Common case where there is no separate debug objfile. */
489 if (objfile
== parent
)
492 /* Return the brother if any. Note that we don't iterate on brothers of
494 res
= objfile
->separate_debug_objfile_link
;
498 for (res
= objfile
->separate_debug_objfile_backlink
;
500 res
= res
->separate_debug_objfile_backlink
)
502 gdb_assert (res
!= NULL
);
503 if (res
->separate_debug_objfile_link
)
504 return res
->separate_debug_objfile_link
;
509 /* Put one object file before a specified on in the global list.
510 This can be used to make sure an object file is destroyed before
511 another when using objfiles_safe to free all objfiles. */
513 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
515 struct objfile
**objp
;
517 unlink_objfile (objfile
);
519 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
521 if (*objp
== before_this
)
523 objfile
->next
= *objp
;
529 internal_error (__FILE__
, __LINE__
,
530 _("put_objfile_before: before objfile not in list"));
533 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
536 It is not a bug, or error, to call this function if OBJFILE is not known
537 to be in the current list. This is done in the case of mapped objfiles,
538 for example, just to ensure that the mapped objfile doesn't appear twice
539 in the list. Since the list is threaded, linking in a mapped objfile
540 twice would create a circular list.
542 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
543 unlinking it, just to ensure that we have completely severed any linkages
544 between the OBJFILE and the list. */
547 unlink_objfile (struct objfile
*objfile
)
549 struct objfile
**objpp
;
551 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
553 if (*objpp
== objfile
)
555 *objpp
= (*objpp
)->next
;
556 objfile
->next
= NULL
;
561 internal_error (__FILE__
, __LINE__
,
562 _("unlink_objfile: objfile already unlinked"));
565 /* Add OBJFILE as a separate debug objfile of PARENT. */
568 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
570 gdb_assert (objfile
&& parent
);
572 /* Must not be already in a list. */
573 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
574 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
575 gdb_assert (objfile
->separate_debug_objfile
== NULL
);
576 gdb_assert (parent
->separate_debug_objfile_backlink
== NULL
);
577 gdb_assert (parent
->separate_debug_objfile_link
== NULL
);
579 objfile
->separate_debug_objfile_backlink
= parent
;
580 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
581 parent
->separate_debug_objfile
= objfile
;
583 /* Put the separate debug object before the normal one, this is so that
584 usage of objfiles_safe will stay safe. */
585 put_objfile_before (objfile
, parent
);
588 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
592 free_objfile_separate_debug (struct objfile
*objfile
)
594 struct objfile
*child
;
596 for (child
= objfile
->separate_debug_objfile
; child
;)
598 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
604 /* Destroy an objfile and all the symtabs and psymtabs under it. */
608 /* First notify observers that this objfile is about to be freed. */
609 gdb::observers::free_objfile
.notify (this);
611 /* Free all separate debug objfiles. */
612 free_objfile_separate_debug (this);
614 if (separate_debug_objfile_backlink
)
616 /* We freed the separate debug file, make sure the base objfile
617 doesn't reference it. */
618 struct objfile
*child
;
620 child
= separate_debug_objfile_backlink
->separate_debug_objfile
;
624 /* THIS is the first child. */
625 separate_debug_objfile_backlink
->separate_debug_objfile
=
626 separate_debug_objfile_link
;
630 /* Find THIS in the list. */
633 if (child
->separate_debug_objfile_link
== this)
635 child
->separate_debug_objfile_link
=
636 separate_debug_objfile_link
;
639 child
= child
->separate_debug_objfile_link
;
645 /* Remove any references to this objfile in the global value
647 preserve_values (this);
649 /* It still may reference data modules have associated with the objfile and
650 the symbol file data. */
651 forget_cached_source_info_for_objfile (this);
653 breakpoint_free_objfile (this);
654 btrace_free_objfile (this);
656 /* First do any symbol file specific actions required when we are
657 finished with a particular symbol file. Note that if the objfile
658 is using reusable symbol information (via mmalloc) then each of
659 these routines is responsible for doing the correct thing, either
660 freeing things which are valid only during this particular gdb
661 execution, or leaving them to be reused during the next one. */
664 (*sf
->sym_finish
) (this);
666 /* Discard any data modules have associated with the objfile. The function
667 still may reference obfd. */
668 objfile_free_data (this);
671 gdb_bfd_unref (obfd
);
673 free_objfile_per_bfd_storage (per_bfd
);
675 /* Remove it from the chain of all objfiles. */
677 unlink_objfile (this);
679 if (this == symfile_objfile
)
680 symfile_objfile
= NULL
;
682 /* Before the symbol table code was redone to make it easier to
683 selectively load and remove information particular to a specific
684 linkage unit, gdb used to do these things whenever the monolithic
685 symbol table was blown away. How much still needs to be done
686 is unknown, but we play it safe for now and keep each action until
687 it is shown to be no longer needed. */
689 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
690 for example), so we need to call this here. */
691 clear_pc_function_cache ();
693 /* Clear globals which might have pointed into a removed objfile.
694 FIXME: It's not clear which of these are supposed to persist
695 between expressions and which ought to be reset each time. */
696 expression_context_block
= NULL
;
697 innermost_block
.reset ();
699 /* Check to see if the current_source_symtab belongs to this objfile,
700 and if so, call clear_current_source_symtab_and_line. */
703 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
705 if (cursal
.symtab
&& SYMTAB_OBJFILE (cursal
.symtab
) == this)
706 clear_current_source_symtab_and_line ();
709 /* Free the obstacks for non-reusable objfiles. */
710 obstack_free (&objfile_obstack
, 0);
712 /* Rebuild section map next time we need it. */
713 get_objfile_pspace_data (pspace
)->section_map_dirty
= 1;
715 /* Free the map for static links. There's no need to free static link
716 themselves since they were allocated on the objstack. */
717 if (static_links
!= NULL
)
718 htab_delete (static_links
);
721 /* Free all the object files at once and clean up their users. */
724 free_all_objfiles (void)
728 /* Any objfile referencewould become stale. */
729 for (so
= master_so_list (); so
; so
= so
->next
)
730 gdb_assert (so
->objfile
== NULL
);
732 for (objfile
*objfile
: current_program_space
->objfiles_safe ())
734 clear_symtab_users (0);
737 /* A helper function for objfile_relocate1 that relocates a single
741 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
742 struct section_offsets
*delta
)
744 fixup_symbol_section (sym
, objfile
);
746 /* The RS6000 code from which this was taken skipped
747 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
748 But I'm leaving out that test, on the theory that
749 they can't possibly pass the tests below. */
750 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
751 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
752 && SYMBOL_SECTION (sym
) >= 0)
754 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
758 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
759 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
760 Return non-zero iff any change happened. */
763 objfile_relocate1 (struct objfile
*objfile
,
764 const struct section_offsets
*new_offsets
)
766 struct section_offsets
*delta
=
767 ((struct section_offsets
*)
768 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
770 int something_changed
= 0;
772 for (int i
= 0; i
< objfile
->num_sections
; ++i
)
775 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
776 if (ANOFFSET (delta
, i
) != 0)
777 something_changed
= 1;
779 if (!something_changed
)
782 /* OK, get all the symtabs. */
784 for (compunit_symtab
*cust
: objfile
->compunits ())
786 for (symtab
*s
: compunit_filetabs (cust
))
790 /* First the line table. */
791 l
= SYMTAB_LINETABLE (s
);
794 for (int i
= 0; i
< l
->nitems
; ++i
)
795 l
->item
[i
].pc
+= ANOFFSET (delta
,
796 COMPUNIT_BLOCK_LINE_SECTION
802 for (compunit_symtab
*cust
: objfile
->compunits ())
804 const struct blockvector
*bv
= COMPUNIT_BLOCKVECTOR (cust
);
805 int block_line_section
= COMPUNIT_BLOCK_LINE_SECTION (cust
);
807 if (BLOCKVECTOR_MAP (bv
))
808 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
809 ANOFFSET (delta
, block_line_section
));
811 for (int i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
815 struct mdict_iterator miter
;
817 b
= BLOCKVECTOR_BLOCK (bv
, i
);
818 BLOCK_START (b
) += ANOFFSET (delta
, block_line_section
);
819 BLOCK_END (b
) += ANOFFSET (delta
, block_line_section
);
821 if (BLOCK_RANGES (b
) != nullptr)
822 for (int j
= 0; j
< BLOCK_NRANGES (b
); j
++)
824 BLOCK_RANGE_START (b
, j
)
825 += ANOFFSET (delta
, block_line_section
);
826 BLOCK_RANGE_END (b
, j
) += ANOFFSET (delta
,
830 /* We only want to iterate over the local symbols, not any
831 symbols in included symtabs. */
832 ALL_DICT_SYMBOLS (BLOCK_MULTIDICT (b
), miter
, sym
)
834 relocate_one_symbol (sym
, objfile
, delta
);
840 /* This stores relocated addresses and so must be cleared. This
841 will cause it to be recreated on demand. */
842 objfile
->psymbol_map
.clear ();
844 /* Relocate isolated symbols. */
848 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
849 relocate_one_symbol (iter
, objfile
, delta
);
855 for (i
= 0; i
< objfile
->num_sections
; ++i
)
856 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
859 /* Rebuild section map next time we need it. */
860 get_objfile_pspace_data (objfile
->pspace
)->section_map_dirty
= 1;
862 /* Update the table in exec_ops, used to read memory. */
863 struct obj_section
*s
;
864 ALL_OBJFILE_OSECTIONS (objfile
, s
)
866 int idx
= s
- objfile
->sections
;
868 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
869 obj_section_addr (s
));
876 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
877 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
879 The number and ordering of sections does differ between the two objfiles.
880 Only their names match. Also the file offsets will differ (objfile being
881 possibly prelinked but separate_debug_objfile is probably not prelinked) but
882 the in-memory absolute address as specified by NEW_OFFSETS must match both
886 objfile_relocate (struct objfile
*objfile
,
887 const struct section_offsets
*new_offsets
)
889 struct objfile
*debug_objfile
;
892 changed
|= objfile_relocate1 (objfile
, new_offsets
);
894 for (debug_objfile
= objfile
->separate_debug_objfile
;
896 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
898 section_addr_info objfile_addrs
899 = build_section_addr_info_from_objfile (objfile
);
901 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
902 relative ones must be already created according to debug_objfile. */
904 addr_info_make_relative (&objfile_addrs
, debug_objfile
->obfd
);
906 gdb_assert (debug_objfile
->num_sections
907 == gdb_bfd_count_sections (debug_objfile
->obfd
));
908 std::vector
<struct section_offsets
>
909 new_debug_offsets (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
910 relative_addr_info_to_section_offsets (new_debug_offsets
.data (),
911 debug_objfile
->num_sections
,
914 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
.data ());
917 /* Relocate breakpoints as necessary, after things are relocated. */
919 breakpoint_re_set ();
922 /* Rebase (add to the offsets) OBJFILE by SLIDE. SEPARATE_DEBUG_OBJFILE is
924 Return non-zero iff any change happened. */
927 objfile_rebase1 (struct objfile
*objfile
, CORE_ADDR slide
)
929 struct section_offsets
*new_offsets
=
930 ((struct section_offsets
*)
931 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
934 for (i
= 0; i
< objfile
->num_sections
; ++i
)
935 new_offsets
->offsets
[i
] = slide
;
937 return objfile_relocate1 (objfile
, new_offsets
);
940 /* Rebase (add to the offsets) OBJFILE by SLIDE. Process also OBJFILE's
941 SEPARATE_DEBUG_OBJFILEs. */
944 objfile_rebase (struct objfile
*objfile
, CORE_ADDR slide
)
946 struct objfile
*debug_objfile
;
949 changed
|= objfile_rebase1 (objfile
, slide
);
951 for (debug_objfile
= objfile
->separate_debug_objfile
;
953 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
954 changed
|= objfile_rebase1 (debug_objfile
, slide
);
956 /* Relocate breakpoints as necessary, after things are relocated. */
958 breakpoint_re_set ();
961 /* Return non-zero if OBJFILE has partial symbols. */
964 objfile_has_partial_symbols (struct objfile
*objfile
)
969 /* If we have not read psymbols, but we have a function capable of reading
970 them, then that is an indication that they are in fact available. Without
971 this function the symbols may have been already read in but they also may
972 not be present in this objfile. */
973 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
974 && objfile
->sf
->sym_read_psymbols
!= NULL
)
977 return objfile
->sf
->qf
->has_symbols (objfile
);
980 /* Return non-zero if OBJFILE has full symbols. */
983 objfile_has_full_symbols (struct objfile
*objfile
)
985 return objfile
->compunit_symtabs
!= NULL
;
988 /* Return non-zero if OBJFILE has full or partial symbols, either directly
989 or through a separate debug file. */
992 objfile_has_symbols (struct objfile
*objfile
)
996 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
997 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
1003 /* Many places in gdb want to test just to see if we have any partial
1004 symbols available. This function returns zero if none are currently
1005 available, nonzero otherwise. */
1008 have_partial_symbols (void)
1010 for (objfile
*ofp
: current_program_space
->objfiles ())
1012 if (objfile_has_partial_symbols (ofp
))
1018 /* Many places in gdb want to test just to see if we have any full
1019 symbols available. This function returns zero if none are currently
1020 available, nonzero otherwise. */
1023 have_full_symbols (void)
1025 for (objfile
*ofp
: current_program_space
->objfiles ())
1027 if (objfile_has_full_symbols (ofp
))
1034 /* This operations deletes all objfile entries that represent solibs that
1035 weren't explicitly loaded by the user, via e.g., the add-symbol-file
1039 objfile_purge_solibs (void)
1041 for (objfile
*objf
: current_program_space
->objfiles_safe ())
1043 /* We assume that the solib package has been purged already, or will
1046 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
1052 /* Many places in gdb want to test just to see if we have any minimal
1053 symbols available. This function returns zero if none are currently
1054 available, nonzero otherwise. */
1057 have_minimal_symbols (void)
1059 for (objfile
*ofp
: current_program_space
->objfiles ())
1061 if (ofp
->per_bfd
->minimal_symbol_count
> 0)
1069 /* Qsort comparison function. */
1072 qsort_cmp (const void *a
, const void *b
)
1074 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1075 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1076 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1077 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1079 if (sect1_addr
< sect2_addr
)
1081 else if (sect1_addr
> sect2_addr
)
1085 /* Sections are at the same address. This could happen if
1086 A) we have an objfile and a separate debuginfo.
1087 B) we are confused, and have added sections without proper relocation,
1088 or something like that. */
1090 const struct objfile
*const objfile1
= sect1
->objfile
;
1091 const struct objfile
*const objfile2
= sect2
->objfile
;
1093 if (objfile1
->separate_debug_objfile
== objfile2
1094 || objfile2
->separate_debug_objfile
== objfile1
)
1096 /* Case A. The ordering doesn't matter: separate debuginfo files
1097 will be filtered out later. */
1102 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1103 triage. This section could be slow (since we iterate over all
1104 objfiles in each call to qsort_cmp), but this shouldn't happen
1105 very often (GDB is already in a confused state; one hopes this
1106 doesn't happen at all). If you discover that significant time is
1107 spent in the loops below, do 'set complaints 100' and examine the
1108 resulting complaints. */
1110 if (objfile1
== objfile2
)
1112 /* Both sections came from the same objfile. We are really confused.
1113 Sort on sequence order of sections within the objfile. */
1115 const struct obj_section
*osect
;
1117 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1120 else if (osect
== sect2
)
1123 /* We should have found one of the sections before getting here. */
1124 gdb_assert_not_reached ("section not found");
1128 /* Sort on sequence number of the objfile in the chain. */
1130 for (objfile
*objfile
: current_program_space
->objfiles ())
1131 if (objfile
== objfile1
)
1133 else if (objfile
== objfile2
)
1136 /* We should have found one of the objfiles before getting here. */
1137 gdb_assert_not_reached ("objfile not found");
1142 gdb_assert_not_reached ("unexpected code path");
1146 /* Select "better" obj_section to keep. We prefer the one that came from
1147 the real object, rather than the one from separate debuginfo.
1148 Most of the time the two sections are exactly identical, but with
1149 prelinking the .rel.dyn section in the real object may have different
1152 static struct obj_section
*
1153 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1155 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1156 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1157 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1158 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1159 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1161 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1166 /* Return 1 if SECTION should be inserted into the section map.
1167 We want to insert only non-overlay and non-TLS section. */
1170 insert_section_p (const struct bfd
*abfd
,
1171 const struct bfd_section
*section
)
1173 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1175 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1176 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1177 /* This is an overlay section. IN_MEMORY check is needed to avoid
1178 discarding sections from the "system supplied DSO" (aka vdso)
1179 on some Linux systems (e.g. Fedora 11). */
1181 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1182 /* This is a TLS section. */
1188 /* Filter out overlapping sections where one section came from the real
1189 objfile, and the other from a separate debuginfo file.
1190 Return the size of table after redundant sections have been eliminated. */
1193 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1197 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1199 struct obj_section
*const sect1
= map
[i
];
1200 struct obj_section
*const sect2
= map
[i
+ 1];
1201 const struct objfile
*const objfile1
= sect1
->objfile
;
1202 const struct objfile
*const objfile2
= sect2
->objfile
;
1203 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1204 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1206 if (sect1_addr
== sect2_addr
1207 && (objfile1
->separate_debug_objfile
== objfile2
1208 || objfile2
->separate_debug_objfile
== objfile1
))
1210 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1219 gdb_assert (i
== map_size
- 1);
1223 /* The map should not have shrunk to less than half the original size. */
1224 gdb_assert (map_size
/ 2 <= j
);
1229 /* Filter out overlapping sections, issuing a warning if any are found.
1230 Overlapping sections could really be overlay sections which we didn't
1231 classify as such in insert_section_p, or we could be dealing with a
1235 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1239 for (i
= 0, j
= 0; i
< map_size
- 1; )
1244 for (k
= i
+ 1; k
< map_size
; k
++)
1246 struct obj_section
*const sect1
= map
[i
];
1247 struct obj_section
*const sect2
= map
[k
];
1248 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1249 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1250 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1252 gdb_assert (sect1_addr
<= sect2_addr
);
1254 if (sect1_endaddr
<= sect2_addr
)
1258 /* We have an overlap. Report it. */
1260 struct objfile
*const objf1
= sect1
->objfile
;
1261 struct objfile
*const objf2
= sect2
->objfile
;
1263 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1264 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1266 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1268 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1270 complaint (_("unexpected overlap between:\n"
1271 " (A) section `%s' from `%s' [%s, %s)\n"
1272 " (B) section `%s' from `%s' [%s, %s).\n"
1273 "Will ignore section B"),
1274 bfd_section_name (abfd1
, bfds1
), objfile_name (objf1
),
1275 paddress (gdbarch
, sect1_addr
),
1276 paddress (gdbarch
, sect1_endaddr
),
1277 bfd_section_name (abfd2
, bfds2
), objfile_name (objf2
),
1278 paddress (gdbarch
, sect2_addr
),
1279 paddress (gdbarch
, sect2_endaddr
));
1287 gdb_assert (i
== map_size
- 1);
1295 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1296 TLS, overlay and overlapping sections. */
1299 update_section_map (struct program_space
*pspace
,
1300 struct obj_section
***pmap
, int *pmap_size
)
1302 struct objfile_pspace_info
*pspace_info
;
1303 int alloc_size
, map_size
, i
;
1304 struct obj_section
*s
, **map
;
1306 pspace_info
= get_objfile_pspace_data (pspace
);
1307 gdb_assert (pspace_info
->section_map_dirty
!= 0
1308 || pspace_info
->new_objfiles_available
!= 0);
1314 for (objfile
*objfile
: pspace
->objfiles ())
1315 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1316 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1319 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1320 if (alloc_size
== 0)
1327 map
= XNEWVEC (struct obj_section
*, alloc_size
);
1330 for (objfile
*objfile
: pspace
->objfiles ())
1331 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1332 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1335 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1336 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1337 map_size
= filter_overlapping_sections(map
, map_size
);
1339 if (map_size
< alloc_size
)
1340 /* Some sections were eliminated. Trim excess space. */
1341 map
= XRESIZEVEC (struct obj_section
*, map
, map_size
);
1343 gdb_assert (alloc_size
== map_size
);
1346 *pmap_size
= map_size
;
1349 /* Bsearch comparison function. */
1352 bsearch_cmp (const void *key
, const void *elt
)
1354 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1355 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1357 if (pc
< obj_section_addr (section
))
1359 if (pc
< obj_section_endaddr (section
))
1364 /* Returns a section whose range includes PC or NULL if none found. */
1366 struct obj_section
*
1367 find_pc_section (CORE_ADDR pc
)
1369 struct objfile_pspace_info
*pspace_info
;
1370 struct obj_section
*s
, **sp
;
1372 /* Check for mapped overlay section first. */
1373 s
= find_pc_mapped_section (pc
);
1377 pspace_info
= get_objfile_pspace_data (current_program_space
);
1378 if (pspace_info
->section_map_dirty
1379 || (pspace_info
->new_objfiles_available
1380 && !pspace_info
->inhibit_updates
))
1382 update_section_map (current_program_space
,
1383 &pspace_info
->sections
,
1384 &pspace_info
->num_sections
);
1386 /* Don't need updates to section map until objfiles are added,
1387 removed or relocated. */
1388 pspace_info
->new_objfiles_available
= 0;
1389 pspace_info
->section_map_dirty
= 0;
1392 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1393 bsearch be non-NULL. */
1394 if (pspace_info
->sections
== NULL
)
1396 gdb_assert (pspace_info
->num_sections
== 0);
1400 sp
= (struct obj_section
**) bsearch (&pc
,
1401 pspace_info
->sections
,
1402 pspace_info
->num_sections
,
1403 sizeof (*pspace_info
->sections
),
1411 /* Return non-zero if PC is in a section called NAME. */
1414 pc_in_section (CORE_ADDR pc
, const char *name
)
1416 struct obj_section
*s
;
1419 s
= find_pc_section (pc
);
1422 && s
->the_bfd_section
->name
!= NULL
1423 && strcmp (s
->the_bfd_section
->name
, name
) == 0);
1428 /* Set section_map_dirty so section map will be rebuilt next time it
1429 is used. Called by reread_symbols. */
1432 objfiles_changed (void)
1434 /* Rebuild section map next time we need it. */
1435 get_objfile_pspace_data (current_program_space
)->section_map_dirty
= 1;
1438 /* See comments in objfiles.h. */
1440 scoped_restore_tmpl
<int>
1441 inhibit_section_map_updates (struct program_space
*pspace
)
1443 return scoped_restore_tmpl
<int>
1444 (&get_objfile_pspace_data (pspace
)->inhibit_updates
, 1);
1447 /* Return 1 if ADDR maps into one of the sections of OBJFILE and 0
1451 is_addr_in_objfile (CORE_ADDR addr
, const struct objfile
*objfile
)
1453 struct obj_section
*osect
;
1455 if (objfile
== NULL
)
1458 ALL_OBJFILE_OSECTIONS (objfile
, osect
)
1460 if (section_is_overlay (osect
) && !section_is_mapped (osect
))
1463 if (obj_section_addr (osect
) <= addr
1464 && addr
< obj_section_endaddr (osect
))
1471 shared_objfile_contains_address_p (struct program_space
*pspace
,
1474 for (objfile
*objfile
: pspace
->objfiles ())
1476 if ((objfile
->flags
& OBJF_SHARED
) != 0
1477 && is_addr_in_objfile (address
, objfile
))
1484 /* The default implementation for the "iterate_over_objfiles_in_search_order"
1485 gdbarch method. It is equivalent to use the objfiles iterable,
1486 searching the objfiles in the order they are stored internally,
1487 ignoring CURRENT_OBJFILE.
1489 On most platorms, it should be close enough to doing the best
1490 we can without some knowledge specific to the architecture. */
1493 default_iterate_over_objfiles_in_search_order
1494 (struct gdbarch
*gdbarch
,
1495 iterate_over_objfiles_in_search_order_cb_ftype
*cb
,
1496 void *cb_data
, struct objfile
*current_objfile
)
1500 for (objfile
*objfile
: current_program_space
->objfiles ())
1502 stop
= cb (objfile
, cb_data
);
1508 /* See objfiles.h. */
1511 objfile_name (const struct objfile
*objfile
)
1513 if (objfile
->obfd
!= NULL
)
1514 return bfd_get_filename (objfile
->obfd
);
1516 return objfile
->original_name
;
1519 /* See objfiles.h. */
1522 objfile_filename (const struct objfile
*objfile
)
1524 if (objfile
->obfd
!= NULL
)
1525 return bfd_get_filename (objfile
->obfd
);
1530 /* See objfiles.h. */
1533 objfile_debug_name (const struct objfile
*objfile
)
1535 return lbasename (objfile
->original_name
);
1538 /* See objfiles.h. */
1541 objfile_flavour_name (struct objfile
*objfile
)
1543 if (objfile
->obfd
!= NULL
)
1544 return bfd_flavour_name (bfd_get_flavour (objfile
->obfd
));
1549 _initialize_objfiles (void)
1551 objfiles_pspace_data
1552 = register_program_space_data_with_cleanup (NULL
,
1553 objfiles_pspace_data_cleanup
);
1555 objfiles_bfd_data
= register_bfd_data_with_cleanup (NULL
,
1556 objfile_bfd_data_free
);