1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992-2004, 2007-2012 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 "mdebugread.h"
34 #include "expression.h"
35 #include "parser-defs.h"
37 #include "gdb_assert.h"
38 #include <sys/types.h>
41 #include "gdb_obstack.h"
42 #include "gdb_string.h"
45 #include "breakpoint.h"
47 #include "dictionary.h"
50 #include "arch-utils.h"
53 #include "complaints.h"
57 /* Prototypes for local functions */
59 static void objfile_alloc_data (struct objfile
*objfile
);
60 static void objfile_free_data (struct objfile
*objfile
);
62 /* Externally visible variables that are owned by this module.
63 See declarations in objfile.h for more info. */
65 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
67 struct objfile_pspace_info
69 int objfiles_changed_p
;
70 struct obj_section
**sections
;
74 /* Per-program-space data key. */
75 static const struct program_space_data
*objfiles_pspace_data
;
78 objfiles_pspace_data_cleanup (struct program_space
*pspace
, void *arg
)
80 struct objfile_pspace_info
*info
;
82 info
= program_space_data (pspace
, objfiles_pspace_data
);
85 xfree (info
->sections
);
90 /* Get the current svr4 data. If none is found yet, add it now. This
91 function always returns a valid object. */
93 static struct objfile_pspace_info
*
94 get_objfile_pspace_data (struct program_space
*pspace
)
96 struct objfile_pspace_info
*info
;
98 info
= program_space_data (pspace
, objfiles_pspace_data
);
101 info
= XZALLOC (struct objfile_pspace_info
);
102 set_program_space_data (pspace
, objfiles_pspace_data
, info
);
108 /* Called via bfd_map_over_sections to build up the section table that
109 the objfile references. The objfile contains pointers to the start
110 of the table (objfile->sections) and to the first location after
111 the end of the table (objfile->sections_end). */
114 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
117 struct objfile
*objfile
= (struct objfile
*) objfilep
;
118 struct obj_section section
;
121 aflag
= bfd_get_section_flags (abfd
, asect
);
122 if (!(aflag
& SEC_ALLOC
))
124 if (bfd_section_size (abfd
, asect
) == 0)
127 section
.objfile
= objfile
;
128 section
.the_bfd_section
= asect
;
129 section
.ovly_mapped
= 0;
130 obstack_grow (&objfile
->objfile_obstack
,
131 (char *) §ion
, sizeof (section
));
132 objfile
->sections_end
133 = (struct obj_section
*) (((size_t) objfile
->sections_end
) + 1);
136 /* Builds a section table for OBJFILE.
138 Note that while we are building the table, which goes into the
139 objfile obstack, we hijack the sections_end pointer to instead hold
140 a count of the number of sections. When bfd_map_over_sections
141 returns, this count is used to compute the pointer to the end of
142 the sections table, which then overwrites the count.
144 Also note that the OFFSET and OVLY_MAPPED in each table entry
145 are initialized to zero.
147 Also note that if anything else writes to the objfile obstack while
148 we are building the table, we're pretty much hosed. */
151 build_objfile_section_table (struct objfile
*objfile
)
153 objfile
->sections_end
= 0;
154 bfd_map_over_sections (objfile
->obfd
,
155 add_to_objfile_sections
, (void *) objfile
);
156 objfile
->sections
= obstack_finish (&objfile
->objfile_obstack
);
157 objfile
->sections_end
= objfile
->sections
+ (size_t) objfile
->sections_end
;
160 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
161 allocate a new objfile struct, fill it in as best we can, link it
162 into the list of all known objfiles, and return a pointer to the
165 The FLAGS word contains various bits (OBJF_*) that can be taken as
166 requests for specific operations. Other bits like OBJF_SHARED are
167 simply copied through to the new objfile flags member. */
169 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
170 by jv-lang.c, to create an artificial objfile used to hold
171 information about dynamically-loaded Java classes. Unfortunately,
172 that branch of this function doesn't get tested very frequently, so
173 it's prone to breakage. (E.g. at one time the name was set to NULL
174 in that situation, which broke a loop over all names in the dynamic
175 library loader.) If you change this function, please try to leave
176 things in a consistent state even if abfd is NULL. */
179 allocate_objfile (bfd
*abfd
, int flags
)
181 struct objfile
*objfile
;
183 objfile
= (struct objfile
*) xzalloc (sizeof (struct objfile
));
184 objfile
->psymbol_cache
= psymbol_bcache_init ();
185 objfile
->macro_cache
= bcache_xmalloc (NULL
, NULL
);
186 objfile
->filename_cache
= bcache_xmalloc (NULL
, NULL
);
187 /* We could use obstack_specify_allocation here instead, but
188 gdb_obstack.h specifies the alloc/dealloc functions. */
189 obstack_init (&objfile
->objfile_obstack
);
190 terminate_minimal_symbol_table (objfile
);
192 objfile_alloc_data (objfile
);
194 /* Update the per-objfile information that comes from the bfd, ensuring
195 that any data that is reference is saved in the per-objfile data
198 objfile
->obfd
= gdb_bfd_ref (abfd
);
201 /* Look up the gdbarch associated with the BFD. */
202 objfile
->gdbarch
= gdbarch_from_bfd (abfd
);
204 objfile
->name
= xstrdup (bfd_get_filename (abfd
));
205 objfile
->mtime
= bfd_get_mtime (abfd
);
207 /* Build section table. */
208 build_objfile_section_table (objfile
);
212 objfile
->name
= xstrdup ("<<anonymous objfile>>");
215 objfile
->pspace
= current_program_space
;
217 /* Initialize the section indexes for this objfile, so that we can
218 later detect if they are used w/o being properly assigned to. */
220 objfile
->sect_index_text
= -1;
221 objfile
->sect_index_data
= -1;
222 objfile
->sect_index_bss
= -1;
223 objfile
->sect_index_rodata
= -1;
225 /* Add this file onto the tail of the linked list of other such files. */
227 objfile
->next
= NULL
;
228 if (object_files
== NULL
)
229 object_files
= objfile
;
232 struct objfile
*last_one
;
234 for (last_one
= object_files
;
236 last_one
= last_one
->next
);
237 last_one
->next
= objfile
;
240 /* Save passed in flag bits. */
241 objfile
->flags
|= flags
;
243 /* Rebuild section map next time we need it. */
244 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
249 /* Retrieve the gdbarch associated with OBJFILE. */
251 get_objfile_arch (struct objfile
*objfile
)
253 return objfile
->gdbarch
;
256 /* Initialize entry point information for this objfile. */
259 init_entry_point_info (struct objfile
*objfile
)
261 /* Save startup file's range of PC addresses to help blockframe.c
262 decide where the bottom of the stack is. */
264 if (bfd_get_file_flags (objfile
->obfd
) & EXEC_P
)
266 /* Executable file -- record its entry point so we'll recognize
267 the startup file because it contains the entry point. */
268 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
269 objfile
->ei
.entry_point_p
= 1;
271 else if (bfd_get_file_flags (objfile
->obfd
) & DYNAMIC
272 && bfd_get_start_address (objfile
->obfd
) != 0)
274 /* Some shared libraries may have entry points set and be
275 runnable. There's no clear way to indicate this, so just check
276 for values other than zero. */
277 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
278 objfile
->ei
.entry_point_p
= 1;
282 /* Examination of non-executable.o files. Short-circuit this stuff. */
283 objfile
->ei
.entry_point_p
= 0;
287 /* If there is a valid and known entry point, function fills *ENTRY_P with it
288 and returns non-zero; otherwise it returns zero. */
291 entry_point_address_query (CORE_ADDR
*entry_p
)
293 struct gdbarch
*gdbarch
;
294 CORE_ADDR entry_point
;
296 if (symfile_objfile
== NULL
|| !symfile_objfile
->ei
.entry_point_p
)
299 gdbarch
= get_objfile_arch (symfile_objfile
);
301 entry_point
= symfile_objfile
->ei
.entry_point
;
303 /* Make certain that the address points at real code, and not a
304 function descriptor. */
305 entry_point
= gdbarch_convert_from_func_ptr_addr (gdbarch
, entry_point
,
308 /* Remove any ISA markers, so that this matches entries in the
310 entry_point
= gdbarch_addr_bits_remove (gdbarch
, entry_point
);
312 *entry_p
= entry_point
;
316 /* Get current entry point address. Call error if it is not known. */
319 entry_point_address (void)
323 if (!entry_point_address_query (&retval
))
324 error (_("Entry point address is not known."));
329 /* Iterator on PARENT and every separate debug objfile of PARENT.
330 The usage pattern is:
331 for (objfile = parent;
333 objfile = objfile_separate_debug_iterate (parent, objfile))
338 objfile_separate_debug_iterate (const struct objfile
*parent
,
339 const struct objfile
*objfile
)
343 /* If any, return the first child. */
344 res
= objfile
->separate_debug_objfile
;
348 /* Common case where there is no separate debug objfile. */
349 if (objfile
== parent
)
352 /* Return the brother if any. Note that we don't iterate on brothers of
354 res
= objfile
->separate_debug_objfile_link
;
358 for (res
= objfile
->separate_debug_objfile_backlink
;
360 res
= res
->separate_debug_objfile_backlink
)
362 gdb_assert (res
!= NULL
);
363 if (res
->separate_debug_objfile_link
)
364 return res
->separate_debug_objfile_link
;
369 /* Put one object file before a specified on in the global list.
370 This can be used to make sure an object file is destroyed before
371 another when using ALL_OBJFILES_SAFE to free all objfiles. */
373 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
375 struct objfile
**objp
;
377 unlink_objfile (objfile
);
379 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
381 if (*objp
== before_this
)
383 objfile
->next
= *objp
;
389 internal_error (__FILE__
, __LINE__
,
390 _("put_objfile_before: before objfile not in list"));
393 /* Put OBJFILE at the front of the list. */
396 objfile_to_front (struct objfile
*objfile
)
398 struct objfile
**objp
;
399 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
401 if (*objp
== objfile
)
403 /* Unhook it from where it is. */
404 *objp
= objfile
->next
;
405 /* Put it in the front. */
406 objfile
->next
= object_files
;
407 object_files
= objfile
;
413 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
416 It is not a bug, or error, to call this function if OBJFILE is not known
417 to be in the current list. This is done in the case of mapped objfiles,
418 for example, just to ensure that the mapped objfile doesn't appear twice
419 in the list. Since the list is threaded, linking in a mapped objfile
420 twice would create a circular list.
422 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
423 unlinking it, just to ensure that we have completely severed any linkages
424 between the OBJFILE and the list. */
427 unlink_objfile (struct objfile
*objfile
)
429 struct objfile
**objpp
;
431 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
433 if (*objpp
== objfile
)
435 *objpp
= (*objpp
)->next
;
436 objfile
->next
= NULL
;
441 internal_error (__FILE__
, __LINE__
,
442 _("unlink_objfile: objfile already unlinked"));
445 /* Add OBJFILE as a separate debug objfile of PARENT. */
448 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
450 gdb_assert (objfile
&& parent
);
452 /* Must not be already in a list. */
453 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
454 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
456 objfile
->separate_debug_objfile_backlink
= parent
;
457 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
458 parent
->separate_debug_objfile
= objfile
;
460 /* Put the separate debug object before the normal one, this is so that
461 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
462 put_objfile_before (objfile
, parent
);
465 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
469 free_objfile_separate_debug (struct objfile
*objfile
)
471 struct objfile
*child
;
473 for (child
= objfile
->separate_debug_objfile
; child
;)
475 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
476 free_objfile (child
);
481 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
482 that as much as possible is allocated on the objfile_obstack
483 so that the memory can be efficiently freed.
485 Things which we do NOT free because they are not in malloc'd memory
486 or not in memory specific to the objfile include:
490 FIXME: If the objfile is using reusable symbol information (via mmalloc),
491 then we need to take into account the fact that more than one process
492 may be using the symbol information at the same time (when mmalloc is
493 extended to support cooperative locking). When more than one process
494 is using the mapped symbol info, we need to be more careful about when
495 we free objects in the reusable area. */
498 free_objfile (struct objfile
*objfile
)
500 /* Free all separate debug objfiles. */
501 free_objfile_separate_debug (objfile
);
503 if (objfile
->separate_debug_objfile_backlink
)
505 /* We freed the separate debug file, make sure the base objfile
506 doesn't reference it. */
507 struct objfile
*child
;
509 child
= objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
;
511 if (child
== objfile
)
513 /* OBJFILE is the first child. */
514 objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
=
515 objfile
->separate_debug_objfile_link
;
519 /* Find OBJFILE in the list. */
522 if (child
->separate_debug_objfile_link
== objfile
)
524 child
->separate_debug_objfile_link
=
525 objfile
->separate_debug_objfile_link
;
528 child
= child
->separate_debug_objfile_link
;
534 /* Remove any references to this objfile in the global value
536 preserve_values (objfile
);
538 /* It still may reference data modules have associated with the objfile and
539 the symbol file data. */
540 forget_cached_source_info_for_objfile (objfile
);
542 /* First do any symbol file specific actions required when we are
543 finished with a particular symbol file. Note that if the objfile
544 is using reusable symbol information (via mmalloc) then each of
545 these routines is responsible for doing the correct thing, either
546 freeing things which are valid only during this particular gdb
547 execution, or leaving them to be reused during the next one. */
549 if (objfile
->sf
!= NULL
)
551 (*objfile
->sf
->sym_finish
) (objfile
);
554 /* Discard any data modules have associated with the objfile. The function
555 still may reference objfile->obfd. */
556 objfile_free_data (objfile
);
558 gdb_bfd_unref (objfile
->obfd
);
560 /* Remove it from the chain of all objfiles. */
562 unlink_objfile (objfile
);
564 if (objfile
== symfile_objfile
)
565 symfile_objfile
= NULL
;
567 if (objfile
== rt_common_objfile
)
568 rt_common_objfile
= NULL
;
570 /* Before the symbol table code was redone to make it easier to
571 selectively load and remove information particular to a specific
572 linkage unit, gdb used to do these things whenever the monolithic
573 symbol table was blown away. How much still needs to be done
574 is unknown, but we play it safe for now and keep each action until
575 it is shown to be no longer needed. */
577 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
578 for example), so we need to call this here. */
579 clear_pc_function_cache ();
581 /* Clear globals which might have pointed into a removed objfile.
582 FIXME: It's not clear which of these are supposed to persist
583 between expressions and which ought to be reset each time. */
584 expression_context_block
= NULL
;
585 innermost_block
= NULL
;
587 /* Check to see if the current_source_symtab belongs to this objfile,
588 and if so, call clear_current_source_symtab_and_line. */
591 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
593 if (cursal
.symtab
&& cursal
.symtab
->objfile
== objfile
)
594 clear_current_source_symtab_and_line ();
597 /* The last thing we do is free the objfile struct itself. */
599 xfree (objfile
->name
);
600 if (objfile
->global_psymbols
.list
)
601 xfree (objfile
->global_psymbols
.list
);
602 if (objfile
->static_psymbols
.list
)
603 xfree (objfile
->static_psymbols
.list
);
604 /* Free the obstacks for non-reusable objfiles. */
605 psymbol_bcache_free (objfile
->psymbol_cache
);
606 bcache_xfree (objfile
->macro_cache
);
607 bcache_xfree (objfile
->filename_cache
);
608 if (objfile
->demangled_names_hash
)
609 htab_delete (objfile
->demangled_names_hash
);
610 obstack_free (&objfile
->objfile_obstack
, 0);
612 /* Rebuild section map next time we need it. */
613 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
619 do_free_objfile_cleanup (void *obj
)
625 make_cleanup_free_objfile (struct objfile
*obj
)
627 return make_cleanup (do_free_objfile_cleanup
, obj
);
630 /* Free all the object files at once and clean up their users. */
633 free_all_objfiles (void)
635 struct objfile
*objfile
, *temp
;
638 /* Any objfile referencewould become stale. */
639 for (so
= master_so_list (); so
; so
= so
->next
)
640 gdb_assert (so
->objfile
== NULL
);
642 ALL_OBJFILES_SAFE (objfile
, temp
)
644 free_objfile (objfile
);
646 clear_symtab_users (0);
649 /* A helper function for objfile_relocate1 that relocates a single
653 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
654 struct section_offsets
*delta
)
656 fixup_symbol_section (sym
, objfile
);
658 /* The RS6000 code from which this was taken skipped
659 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
660 But I'm leaving out that test, on the theory that
661 they can't possibly pass the tests below. */
662 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
663 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
664 && SYMBOL_SECTION (sym
) >= 0)
666 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
670 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
671 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
672 Return non-zero iff any change happened. */
675 objfile_relocate1 (struct objfile
*objfile
,
676 struct section_offsets
*new_offsets
)
678 struct obj_section
*s
;
679 struct section_offsets
*delta
=
680 ((struct section_offsets
*)
681 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
684 int something_changed
= 0;
686 for (i
= 0; i
< objfile
->num_sections
; ++i
)
689 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
690 if (ANOFFSET (delta
, i
) != 0)
691 something_changed
= 1;
693 if (!something_changed
)
696 /* OK, get all the symtabs. */
700 ALL_OBJFILE_SYMTABS (objfile
, s
)
703 struct blockvector
*bv
;
706 /* First the line table. */
710 for (i
= 0; i
< l
->nitems
; ++i
)
711 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
714 /* Don't relocate a shared blockvector more than once. */
718 bv
= BLOCKVECTOR (s
);
719 if (BLOCKVECTOR_MAP (bv
))
720 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
721 ANOFFSET (delta
, s
->block_line_section
));
723 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
727 struct dict_iterator iter
;
729 b
= BLOCKVECTOR_BLOCK (bv
, i
);
730 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
731 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
733 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
735 relocate_one_symbol (sym
, objfile
, delta
);
741 /* Relocate isolated symbols. */
745 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
746 relocate_one_symbol (iter
, objfile
, delta
);
749 if (objfile
->psymtabs_addrmap
)
750 addrmap_relocate (objfile
->psymtabs_addrmap
,
751 ANOFFSET (delta
, SECT_OFF_TEXT (objfile
)));
754 objfile
->sf
->qf
->relocate (objfile
, new_offsets
, delta
);
757 struct minimal_symbol
*msym
;
759 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
760 if (SYMBOL_SECTION (msym
) >= 0)
761 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
763 /* Relocating different sections by different amounts may cause the symbols
764 to be out of order. */
765 msymbols_sort (objfile
);
767 if (objfile
->ei
.entry_point_p
)
769 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
770 only as a fallback. */
771 struct obj_section
*s
;
772 s
= find_pc_section (objfile
->ei
.entry_point
);
774 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
776 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
782 for (i
= 0; i
< objfile
->num_sections
; ++i
)
783 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
786 /* Rebuild section map next time we need it. */
787 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
789 /* Update the table in exec_ops, used to read memory. */
790 ALL_OBJFILE_OSECTIONS (objfile
, s
)
792 int idx
= s
->the_bfd_section
->index
;
794 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
795 obj_section_addr (s
));
798 /* Relocating probes. */
799 if (objfile
->sf
&& objfile
->sf
->sym_probe_fns
)
800 objfile
->sf
->sym_probe_fns
->sym_relocate_probe (objfile
,
807 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
808 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
810 The number and ordering of sections does differ between the two objfiles.
811 Only their names match. Also the file offsets will differ (objfile being
812 possibly prelinked but separate_debug_objfile is probably not prelinked) but
813 the in-memory absolute address as specified by NEW_OFFSETS must match both
817 objfile_relocate (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
819 struct objfile
*debug_objfile
;
822 changed
|= objfile_relocate1 (objfile
, new_offsets
);
824 for (debug_objfile
= objfile
->separate_debug_objfile
;
826 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
828 struct section_addr_info
*objfile_addrs
;
829 struct section_offsets
*new_debug_offsets
;
830 struct cleanup
*my_cleanups
;
832 objfile_addrs
= build_section_addr_info_from_objfile (objfile
);
833 my_cleanups
= make_cleanup (xfree
, objfile_addrs
);
835 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
836 relative ones must be already created according to debug_objfile. */
838 addr_info_make_relative (objfile_addrs
, debug_objfile
->obfd
);
840 gdb_assert (debug_objfile
->num_sections
841 == bfd_count_sections (debug_objfile
->obfd
));
843 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
844 make_cleanup (xfree
, new_debug_offsets
);
845 relative_addr_info_to_section_offsets (new_debug_offsets
,
846 debug_objfile
->num_sections
,
849 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
);
851 do_cleanups (my_cleanups
);
854 /* Relocate breakpoints as necessary, after things are relocated. */
856 breakpoint_re_set ();
859 /* Return non-zero if OBJFILE has partial symbols. */
862 objfile_has_partial_symbols (struct objfile
*objfile
)
867 /* If we have not read psymbols, but we have a function capable of reading
868 them, then that is an indication that they are in fact available. Without
869 this function the symbols may have been already read in but they also may
870 not be present in this objfile. */
871 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0
872 && objfile
->sf
->sym_read_psymbols
!= NULL
)
875 return objfile
->sf
->qf
->has_symbols (objfile
);
878 /* Return non-zero if OBJFILE has full symbols. */
881 objfile_has_full_symbols (struct objfile
*objfile
)
883 return objfile
->symtabs
!= NULL
;
886 /* Return non-zero if OBJFILE has full or partial symbols, either directly
887 or through a separate debug file. */
890 objfile_has_symbols (struct objfile
*objfile
)
894 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
895 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
901 /* Many places in gdb want to test just to see if we have any partial
902 symbols available. This function returns zero if none are currently
903 available, nonzero otherwise. */
906 have_partial_symbols (void)
912 if (objfile_has_partial_symbols (ofp
))
918 /* Many places in gdb want to test just to see if we have any full
919 symbols available. This function returns zero if none are currently
920 available, nonzero otherwise. */
923 have_full_symbols (void)
929 if (objfile_has_full_symbols (ofp
))
936 /* This operations deletes all objfile entries that represent solibs that
937 weren't explicitly loaded by the user, via e.g., the add-symbol-file
941 objfile_purge_solibs (void)
943 struct objfile
*objf
;
944 struct objfile
*temp
;
946 ALL_OBJFILES_SAFE (objf
, temp
)
948 /* We assume that the solib package has been purged already, or will
951 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
957 /* Many places in gdb want to test just to see if we have any minimal
958 symbols available. This function returns zero if none are currently
959 available, nonzero otherwise. */
962 have_minimal_symbols (void)
968 if (ofp
->minimal_symbol_count
> 0)
976 /* Qsort comparison function. */
979 qsort_cmp (const void *a
, const void *b
)
981 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
982 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
983 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
984 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
986 if (sect1_addr
< sect2_addr
)
988 else if (sect1_addr
> sect2_addr
)
992 /* Sections are at the same address. This could happen if
993 A) we have an objfile and a separate debuginfo.
994 B) we are confused, and have added sections without proper relocation,
995 or something like that. */
997 const struct objfile
*const objfile1
= sect1
->objfile
;
998 const struct objfile
*const objfile2
= sect2
->objfile
;
1000 if (objfile1
->separate_debug_objfile
== objfile2
1001 || objfile2
->separate_debug_objfile
== objfile1
)
1003 /* Case A. The ordering doesn't matter: separate debuginfo files
1004 will be filtered out later. */
1009 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1010 triage. This section could be slow (since we iterate over all
1011 objfiles in each call to qsort_cmp), but this shouldn't happen
1012 very often (GDB is already in a confused state; one hopes this
1013 doesn't happen at all). If you discover that significant time is
1014 spent in the loops below, do 'set complaints 100' and examine the
1015 resulting complaints. */
1017 if (objfile1
== objfile2
)
1019 /* Both sections came from the same objfile. We are really confused.
1020 Sort on sequence order of sections within the objfile. */
1022 const struct obj_section
*osect
;
1024 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1027 else if (osect
== sect2
)
1030 /* We should have found one of the sections before getting here. */
1031 gdb_assert_not_reached ("section not found");
1035 /* Sort on sequence number of the objfile in the chain. */
1037 const struct objfile
*objfile
;
1039 ALL_OBJFILES (objfile
)
1040 if (objfile
== objfile1
)
1042 else if (objfile
== objfile2
)
1045 /* We should have found one of the objfiles before getting here. */
1046 gdb_assert_not_reached ("objfile not found");
1051 gdb_assert_not_reached ("unexpected code path");
1055 /* Select "better" obj_section to keep. We prefer the one that came from
1056 the real object, rather than the one from separate debuginfo.
1057 Most of the time the two sections are exactly identical, but with
1058 prelinking the .rel.dyn section in the real object may have different
1061 static struct obj_section
*
1062 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1064 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1065 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1066 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1067 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1068 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1070 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1075 /* Return 1 if SECTION should be inserted into the section map.
1076 We want to insert only non-overlay and non-TLS section. */
1079 insert_section_p (const struct bfd
*abfd
,
1080 const struct bfd_section
*section
)
1082 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1084 if (overlay_debugging
&& lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1085 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1086 /* This is an overlay section. IN_MEMORY check is needed to avoid
1087 discarding sections from the "system supplied DSO" (aka vdso)
1088 on some Linux systems (e.g. Fedora 11). */
1090 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1091 /* This is a TLS section. */
1097 /* Filter out overlapping sections where one section came from the real
1098 objfile, and the other from a separate debuginfo file.
1099 Return the size of table after redundant sections have been eliminated. */
1102 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1106 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1108 struct obj_section
*const sect1
= map
[i
];
1109 struct obj_section
*const sect2
= map
[i
+ 1];
1110 const struct objfile
*const objfile1
= sect1
->objfile
;
1111 const struct objfile
*const objfile2
= sect2
->objfile
;
1112 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1113 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1115 if (sect1_addr
== sect2_addr
1116 && (objfile1
->separate_debug_objfile
== objfile2
1117 || objfile2
->separate_debug_objfile
== objfile1
))
1119 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1128 gdb_assert (i
== map_size
- 1);
1132 /* The map should not have shrunk to less than half the original size. */
1133 gdb_assert (map_size
/ 2 <= j
);
1138 /* Filter out overlapping sections, issuing a warning if any are found.
1139 Overlapping sections could really be overlay sections which we didn't
1140 classify as such in insert_section_p, or we could be dealing with a
1144 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1148 for (i
= 0, j
= 0; i
< map_size
- 1; )
1153 for (k
= i
+ 1; k
< map_size
; k
++)
1155 struct obj_section
*const sect1
= map
[i
];
1156 struct obj_section
*const sect2
= map
[k
];
1157 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1158 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1159 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1161 gdb_assert (sect1_addr
<= sect2_addr
);
1163 if (sect1_endaddr
<= sect2_addr
)
1167 /* We have an overlap. Report it. */
1169 struct objfile
*const objf1
= sect1
->objfile
;
1170 struct objfile
*const objf2
= sect2
->objfile
;
1172 const struct bfd
*const abfd1
= objf1
->obfd
;
1173 const struct bfd
*const abfd2
= objf2
->obfd
;
1175 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1176 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1178 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1180 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1182 complaint (&symfile_complaints
,
1183 _("unexpected overlap between:\n"
1184 " (A) section `%s' from `%s' [%s, %s)\n"
1185 " (B) section `%s' from `%s' [%s, %s).\n"
1186 "Will ignore section B"),
1187 bfd_section_name (abfd1
, bfds1
), objf1
->name
,
1188 paddress (gdbarch
, sect1_addr
),
1189 paddress (gdbarch
, sect1_endaddr
),
1190 bfd_section_name (abfd2
, bfds2
), objf2
->name
,
1191 paddress (gdbarch
, sect2_addr
),
1192 paddress (gdbarch
, sect2_endaddr
));
1200 gdb_assert (i
== map_size
- 1);
1208 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1209 TLS, overlay and overlapping sections. */
1212 update_section_map (struct program_space
*pspace
,
1213 struct obj_section
***pmap
, int *pmap_size
)
1215 int alloc_size
, map_size
, i
;
1216 struct obj_section
*s
, **map
;
1217 struct objfile
*objfile
;
1219 gdb_assert (get_objfile_pspace_data (pspace
)->objfiles_changed_p
!= 0);
1225 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1226 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1227 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1230 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1231 if (alloc_size
== 0)
1238 map
= xmalloc (alloc_size
* sizeof (*map
));
1241 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1242 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1243 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1246 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1247 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1248 map_size
= filter_overlapping_sections(map
, map_size
);
1250 if (map_size
< alloc_size
)
1251 /* Some sections were eliminated. Trim excess space. */
1252 map
= xrealloc (map
, map_size
* sizeof (*map
));
1254 gdb_assert (alloc_size
== map_size
);
1257 *pmap_size
= map_size
;
1260 /* Bsearch comparison function. */
1263 bsearch_cmp (const void *key
, const void *elt
)
1265 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1266 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1268 if (pc
< obj_section_addr (section
))
1270 if (pc
< obj_section_endaddr (section
))
1275 /* Returns a section whose range includes PC or NULL if none found. */
1277 struct obj_section
*
1278 find_pc_section (CORE_ADDR pc
)
1280 struct objfile_pspace_info
*pspace_info
;
1281 struct obj_section
*s
, **sp
;
1283 /* Check for mapped overlay section first. */
1284 s
= find_pc_mapped_section (pc
);
1288 pspace_info
= get_objfile_pspace_data (current_program_space
);
1289 if (pspace_info
->objfiles_changed_p
!= 0)
1291 update_section_map (current_program_space
,
1292 &pspace_info
->sections
,
1293 &pspace_info
->num_sections
);
1295 /* Don't need updates to section map until objfiles are added,
1296 removed or relocated. */
1297 pspace_info
->objfiles_changed_p
= 0;
1300 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1301 bsearch be non-NULL. */
1302 if (pspace_info
->sections
== NULL
)
1304 gdb_assert (pspace_info
->num_sections
== 0);
1308 sp
= (struct obj_section
**) bsearch (&pc
,
1309 pspace_info
->sections
,
1310 pspace_info
->num_sections
,
1311 sizeof (*pspace_info
->sections
),
1319 /* In SVR4, we recognize a trampoline by it's section name.
1320 That is, if the pc is in a section named ".plt" then we are in
1324 in_plt_section (CORE_ADDR pc
, char *name
)
1326 struct obj_section
*s
;
1329 s
= find_pc_section (pc
);
1332 && s
->the_bfd_section
->name
!= NULL
1333 && strcmp (s
->the_bfd_section
->name
, ".plt") == 0);
1338 /* Keep a registry of per-objfile data-pointers required by other GDB
1344 void (*save
) (struct objfile
*, void *);
1345 void (*free
) (struct objfile
*, void *);
1348 struct objfile_data_registration
1350 struct objfile_data
*data
;
1351 struct objfile_data_registration
*next
;
1354 struct objfile_data_registry
1356 struct objfile_data_registration
*registrations
;
1357 unsigned num_registrations
;
1360 static struct objfile_data_registry objfile_data_registry
= { NULL
, 0 };
1362 const struct objfile_data
*
1363 register_objfile_data_with_cleanup (void (*save
) (struct objfile
*, void *),
1364 void (*free
) (struct objfile
*, void *))
1366 struct objfile_data_registration
**curr
;
1368 /* Append new registration. */
1369 for (curr
= &objfile_data_registry
.registrations
;
1370 *curr
!= NULL
; curr
= &(*curr
)->next
);
1372 *curr
= XMALLOC (struct objfile_data_registration
);
1373 (*curr
)->next
= NULL
;
1374 (*curr
)->data
= XMALLOC (struct objfile_data
);
1375 (*curr
)->data
->index
= objfile_data_registry
.num_registrations
++;
1376 (*curr
)->data
->save
= save
;
1377 (*curr
)->data
->free
= free
;
1379 return (*curr
)->data
;
1382 const struct objfile_data
*
1383 register_objfile_data (void)
1385 return register_objfile_data_with_cleanup (NULL
, NULL
);
1389 objfile_alloc_data (struct objfile
*objfile
)
1391 gdb_assert (objfile
->data
== NULL
);
1392 objfile
->num_data
= objfile_data_registry
.num_registrations
;
1393 objfile
->data
= XCALLOC (objfile
->num_data
, void *);
1397 objfile_free_data (struct objfile
*objfile
)
1399 gdb_assert (objfile
->data
!= NULL
);
1400 clear_objfile_data (objfile
);
1401 xfree (objfile
->data
);
1402 objfile
->data
= NULL
;
1406 clear_objfile_data (struct objfile
*objfile
)
1408 struct objfile_data_registration
*registration
;
1411 gdb_assert (objfile
->data
!= NULL
);
1413 /* Process all the save handlers. */
1415 for (registration
= objfile_data_registry
.registrations
, i
= 0;
1416 i
< objfile
->num_data
;
1417 registration
= registration
->next
, i
++)
1418 if (objfile
->data
[i
] != NULL
&& registration
->data
->save
!= NULL
)
1419 registration
->data
->save (objfile
, objfile
->data
[i
]);
1421 /* Now process all the free handlers. */
1423 for (registration
= objfile_data_registry
.registrations
, i
= 0;
1424 i
< objfile
->num_data
;
1425 registration
= registration
->next
, i
++)
1426 if (objfile
->data
[i
] != NULL
&& registration
->data
->free
!= NULL
)
1427 registration
->data
->free (objfile
, objfile
->data
[i
]);
1429 memset (objfile
->data
, 0, objfile
->num_data
* sizeof (void *));
1433 set_objfile_data (struct objfile
*objfile
, const struct objfile_data
*data
,
1436 gdb_assert (data
->index
< objfile
->num_data
);
1437 objfile
->data
[data
->index
] = value
;
1441 objfile_data (struct objfile
*objfile
, const struct objfile_data
*data
)
1443 gdb_assert (data
->index
< objfile
->num_data
);
1444 return objfile
->data
[data
->index
];
1447 /* Set objfiles_changed_p so section map will be rebuilt next time it
1448 is used. Called by reread_symbols. */
1451 objfiles_changed (void)
1453 /* Rebuild section map next time we need it. */
1454 get_objfile_pspace_data (current_program_space
)->objfiles_changed_p
= 1;
1457 /* Close ABFD, and warn if that fails. */
1460 gdb_bfd_close_or_warn (struct bfd
*abfd
)
1463 char *name
= bfd_get_filename (abfd
);
1465 ret
= bfd_close (abfd
);
1468 warning (_("cannot close \"%s\": %s"),
1469 name
, bfd_errmsg (bfd_get_error ()));
1474 /* Add reference to ABFD. Returns ABFD. */
1476 gdb_bfd_ref (struct bfd
*abfd
)
1483 p_refcount
= bfd_usrdata (abfd
);
1485 if (p_refcount
!= NULL
)
1491 p_refcount
= xmalloc (sizeof (*p_refcount
));
1493 bfd_usrdata (abfd
) = p_refcount
;
1498 /* Unreference and possibly close ABFD. */
1500 gdb_bfd_unref (struct bfd
*abfd
)
1508 p_refcount
= bfd_usrdata (abfd
);
1510 /* Valid range for p_refcount: a pointer to int counter, which has a
1511 value of 1 (single owner) or 2 (shared). */
1512 gdb_assert (*p_refcount
== 1 || *p_refcount
== 2);
1515 if (*p_refcount
> 0)
1519 bfd_usrdata (abfd
) = NULL
; /* Paranoia. */
1521 name
= bfd_get_filename (abfd
);
1522 gdb_bfd_close_or_warn (abfd
);
1526 /* Provide a prototype to silence -Wmissing-prototypes. */
1527 extern initialize_file_ftype _initialize_objfiles
;
1530 _initialize_objfiles (void)
1532 objfiles_pspace_data
1533 = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup
);