1 /* GDB routines for manipulating objfiles.
3 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 2002, 2003, 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
6 Contributed by Cygnus Support, using pieces from other GDB modules.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* This file contains support routines for creating, manipulating, and
24 destroying objfile structures. */
27 #include "bfd.h" /* Binary File Description */
31 #include "gdb-stabs.h"
34 #include "mdebugread.h"
35 #include "expression.h"
36 #include "parser-defs.h"
38 #include "gdb_assert.h"
39 #include <sys/types.h>
42 #include "gdb_obstack.h"
43 #include "gdb_string.h"
46 #include "breakpoint.h"
48 #include "dictionary.h"
51 #include "arch-utils.h"
54 #include "complaints.h"
56 /* Prototypes for local functions */
58 static void objfile_alloc_data (struct objfile
*objfile
);
59 static void objfile_free_data (struct objfile
*objfile
);
61 /* Externally visible variables that are owned by this module.
62 See declarations in objfile.h for more info. */
64 struct objfile
*current_objfile
; /* For symbol file being read in */
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 /* Records whether any objfiles appeared or disappeared since we last updated
109 address to obj section map. */
111 /* Locate all mappable sections of a BFD file.
112 objfile_p_char is a char * to get it through
113 bfd_map_over_sections; we cast it back to its proper type. */
115 /* Called via bfd_map_over_sections to build up the section table that
116 the objfile references. The objfile contains pointers to the start
117 of the table (objfile->sections) and to the first location after
118 the end of the table (objfile->sections_end). */
121 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
122 void *objfile_p_char
)
124 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
125 struct obj_section section
;
128 aflag
= bfd_get_section_flags (abfd
, asect
);
130 if (!(aflag
& SEC_ALLOC
))
133 if (0 == bfd_section_size (abfd
, asect
))
135 section
.objfile
= objfile
;
136 section
.the_bfd_section
= asect
;
137 section
.ovly_mapped
= 0;
138 obstack_grow (&objfile
->objfile_obstack
, (char *) §ion
, sizeof (section
));
139 objfile
->sections_end
140 = (struct obj_section
*) (((size_t) objfile
->sections_end
) + 1);
143 /* Builds a section table for OBJFILE.
144 Returns 0 if OK, 1 on error (in which case bfd_error contains the
147 Note that while we are building the table, which goes into the
148 psymbol obstack, we hijack the sections_end pointer to instead hold
149 a count of the number of sections. When bfd_map_over_sections
150 returns, this count is used to compute the pointer to the end of
151 the sections table, which then overwrites the count.
153 Also note that the OFFSET and OVLY_MAPPED in each table entry
154 are initialized to zero.
156 Also note that if anything else writes to the psymbol obstack while
157 we are building the table, we're pretty much hosed. */
160 build_objfile_section_table (struct objfile
*objfile
)
162 /* objfile->sections can be already set when reading a mapped symbol
163 file. I believe that we do need to rebuild the section table in
164 this case (we rebuild other things derived from the bfd), but we
165 can't free the old one (it's in the objfile_obstack). So we just
166 waste some memory. */
168 objfile
->sections_end
= 0;
169 bfd_map_over_sections (objfile
->obfd
,
170 add_to_objfile_sections
, (void *) objfile
);
171 objfile
->sections
= obstack_finish (&objfile
->objfile_obstack
);
172 objfile
->sections_end
= objfile
->sections
+ (size_t) objfile
->sections_end
;
176 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
177 allocate a new objfile struct, fill it in as best we can, link it
178 into the list of all known objfiles, and return a pointer to the
181 The FLAGS word contains various bits (OBJF_*) that can be taken as
182 requests for specific operations. Other bits like OBJF_SHARED are
183 simply copied through to the new objfile flags member. */
185 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
186 by jv-lang.c, to create an artificial objfile used to hold
187 information about dynamically-loaded Java classes. Unfortunately,
188 that branch of this function doesn't get tested very frequently, so
189 it's prone to breakage. (E.g. at one time the name was set to NULL
190 in that situation, which broke a loop over all names in the dynamic
191 library loader.) If you change this function, please try to leave
192 things in a consistent state even if abfd is NULL. */
195 allocate_objfile (bfd
*abfd
, int flags
)
197 struct objfile
*objfile
;
199 objfile
= (struct objfile
*) xzalloc (sizeof (struct objfile
));
200 objfile
->psymbol_cache
= bcache_xmalloc ();
201 objfile
->macro_cache
= bcache_xmalloc ();
202 objfile
->filename_cache
= bcache_xmalloc ();
203 /* We could use obstack_specify_allocation here instead, but
204 gdb_obstack.h specifies the alloc/dealloc functions. */
205 obstack_init (&objfile
->objfile_obstack
);
206 terminate_minimal_symbol_table (objfile
);
208 objfile_alloc_data (objfile
);
210 /* Update the per-objfile information that comes from the bfd, ensuring
211 that any data that is reference is saved in the per-objfile data
214 objfile
->obfd
= gdb_bfd_ref (abfd
);
215 if (objfile
->name
!= NULL
)
217 xfree (objfile
->name
);
221 /* Look up the gdbarch associated with the BFD. */
222 objfile
->gdbarch
= gdbarch_from_bfd (abfd
);
224 objfile
->name
= xstrdup (bfd_get_filename (abfd
));
225 objfile
->mtime
= bfd_get_mtime (abfd
);
227 /* Build section table. */
229 if (build_objfile_section_table (objfile
))
231 error (_("Can't find the file sections in `%s': %s"),
232 objfile
->name
, bfd_errmsg (bfd_get_error ()));
237 objfile
->name
= xstrdup ("<<anonymous objfile>>");
240 objfile
->pspace
= current_program_space
;
242 /* Initialize the section indexes for this objfile, so that we can
243 later detect if they are used w/o being properly assigned to. */
245 objfile
->sect_index_text
= -1;
246 objfile
->sect_index_data
= -1;
247 objfile
->sect_index_bss
= -1;
248 objfile
->sect_index_rodata
= -1;
250 /* We don't yet have a C++-specific namespace symtab. */
252 objfile
->cp_namespace_symtab
= NULL
;
254 /* Add this file onto the tail of the linked list of other such files. */
256 objfile
->next
= NULL
;
257 if (object_files
== NULL
)
258 object_files
= objfile
;
261 struct objfile
*last_one
;
263 for (last_one
= object_files
;
265 last_one
= last_one
->next
);
266 last_one
->next
= objfile
;
269 /* Save passed in flag bits. */
270 objfile
->flags
|= flags
;
272 /* Rebuild section map next time we need it. */
273 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
278 /* Retrieve the gdbarch associated with OBJFILE. */
280 get_objfile_arch (struct objfile
*objfile
)
282 return objfile
->gdbarch
;
285 /* Initialize entry point information for this objfile. */
288 init_entry_point_info (struct objfile
*objfile
)
290 /* Save startup file's range of PC addresses to help blockframe.c
291 decide where the bottom of the stack is. */
293 if (bfd_get_file_flags (objfile
->obfd
) & EXEC_P
)
295 /* Executable file -- record its entry point so we'll recognize
296 the startup file because it contains the entry point. */
297 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
298 objfile
->ei
.entry_point_p
= 1;
300 else if (bfd_get_file_flags (objfile
->obfd
) & DYNAMIC
301 && bfd_get_start_address (objfile
->obfd
) != 0)
303 /* Some shared libraries may have entry points set and be
304 runnable. There's no clear way to indicate this, so just check
305 for values other than zero. */
306 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
307 objfile
->ei
.entry_point_p
= 1;
311 /* Examination of non-executable.o files. Short-circuit this stuff. */
312 objfile
->ei
.entry_point_p
= 0;
316 /* If there is a valid and known entry point, function fills *ENTRY_P with it
317 and returns non-zero; otherwise it returns zero. */
320 entry_point_address_query (CORE_ADDR
*entry_p
)
322 struct gdbarch
*gdbarch
;
323 CORE_ADDR entry_point
;
325 if (symfile_objfile
== NULL
|| !symfile_objfile
->ei
.entry_point_p
)
328 gdbarch
= get_objfile_arch (symfile_objfile
);
330 entry_point
= symfile_objfile
->ei
.entry_point
;
332 /* Make certain that the address points at real code, and not a
333 function descriptor. */
334 entry_point
= gdbarch_convert_from_func_ptr_addr (gdbarch
, entry_point
,
337 /* Remove any ISA markers, so that this matches entries in the
339 entry_point
= gdbarch_addr_bits_remove (gdbarch
, entry_point
);
341 *entry_p
= entry_point
;
345 /* Get current entry point address. Call error if it is not known. */
348 entry_point_address (void)
352 if (!entry_point_address_query (&retval
))
353 error (_("Entry point address is not known."));
358 /* Create the terminating entry of OBJFILE's minimal symbol table.
359 If OBJFILE->msymbols is zero, allocate a single entry from
360 OBJFILE->objfile_obstack; otherwise, just initialize
361 OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */
363 terminate_minimal_symbol_table (struct objfile
*objfile
)
365 if (! objfile
->msymbols
)
366 objfile
->msymbols
= ((struct minimal_symbol
*)
367 obstack_alloc (&objfile
->objfile_obstack
,
368 sizeof (objfile
->msymbols
[0])));
371 struct minimal_symbol
*m
372 = &objfile
->msymbols
[objfile
->minimal_symbol_count
];
374 memset (m
, 0, sizeof (*m
));
375 /* Don't rely on these enumeration values being 0's. */
376 MSYMBOL_TYPE (m
) = mst_unknown
;
377 SYMBOL_INIT_LANGUAGE_SPECIFIC (m
, language_unknown
);
381 /* Iterator on PARENT and every separate debug objfile of PARENT.
382 The usage pattern is:
383 for (objfile = parent;
385 objfile = objfile_separate_debug_iterate (parent, objfile))
390 objfile_separate_debug_iterate (const struct objfile
*parent
,
391 const struct objfile
*objfile
)
395 res
= objfile
->separate_debug_objfile
;
399 res
= objfile
->separate_debug_objfile_link
;
403 /* Common case where there is no separate debug objfile. */
404 if (objfile
== parent
)
407 for (res
= objfile
->separate_debug_objfile_backlink
;
409 res
= res
->separate_debug_objfile_backlink
)
411 gdb_assert (res
!= NULL
);
412 if (res
->separate_debug_objfile_link
)
413 return res
->separate_debug_objfile_link
;
418 /* Put one object file before a specified on in the global list.
419 This can be used to make sure an object file is destroyed before
420 another when using ALL_OBJFILES_SAFE to free all objfiles. */
422 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
424 struct objfile
**objp
;
426 unlink_objfile (objfile
);
428 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
430 if (*objp
== before_this
)
432 objfile
->next
= *objp
;
438 internal_error (__FILE__
, __LINE__
,
439 _("put_objfile_before: before objfile not in list"));
442 /* Put OBJFILE at the front of the list. */
445 objfile_to_front (struct objfile
*objfile
)
447 struct objfile
**objp
;
448 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
450 if (*objp
== objfile
)
452 /* Unhook it from where it is. */
453 *objp
= objfile
->next
;
454 /* Put it in the front. */
455 objfile
->next
= object_files
;
456 object_files
= objfile
;
462 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
465 It is not a bug, or error, to call this function if OBJFILE is not known
466 to be in the current list. This is done in the case of mapped objfiles,
467 for example, just to ensure that the mapped objfile doesn't appear twice
468 in the list. Since the list is threaded, linking in a mapped objfile
469 twice would create a circular list.
471 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
472 unlinking it, just to ensure that we have completely severed any linkages
473 between the OBJFILE and the list. */
476 unlink_objfile (struct objfile
*objfile
)
478 struct objfile
**objpp
;
480 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
482 if (*objpp
== objfile
)
484 *objpp
= (*objpp
)->next
;
485 objfile
->next
= NULL
;
490 internal_error (__FILE__
, __LINE__
,
491 _("unlink_objfile: objfile already unlinked"));
494 /* Add OBJFILE as a separate debug objfile of PARENT. */
497 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
499 gdb_assert (objfile
&& parent
);
501 /* Must not be already in a list. */
502 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
503 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
505 objfile
->separate_debug_objfile_backlink
= parent
;
506 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
507 parent
->separate_debug_objfile
= objfile
;
509 /* Put the separate debug object before the normal one, this is so that
510 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
511 put_objfile_before (objfile
, parent
);
514 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
518 free_objfile_separate_debug (struct objfile
*objfile
)
520 struct objfile
*child
;
522 for (child
= objfile
->separate_debug_objfile
; child
;)
524 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
525 free_objfile (child
);
530 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
531 that as much as possible is allocated on the objfile_obstack
532 so that the memory can be efficiently freed.
534 Things which we do NOT free because they are not in malloc'd memory
535 or not in memory specific to the objfile include:
539 FIXME: If the objfile is using reusable symbol information (via mmalloc),
540 then we need to take into account the fact that more than one process
541 may be using the symbol information at the same time (when mmalloc is
542 extended to support cooperative locking). When more than one process
543 is using the mapped symbol info, we need to be more careful about when
544 we free objects in the reusable area. */
547 free_objfile (struct objfile
*objfile
)
549 /* Free all separate debug objfiles. */
550 free_objfile_separate_debug (objfile
);
552 if (objfile
->separate_debug_objfile_backlink
)
554 /* We freed the separate debug file, make sure the base objfile
555 doesn't reference it. */
556 struct objfile
*child
;
558 child
= objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
;
560 if (child
== objfile
)
562 /* OBJFILE is the first child. */
563 objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
=
564 objfile
->separate_debug_objfile_link
;
568 /* Find OBJFILE in the list. */
571 if (child
->separate_debug_objfile_link
== objfile
)
573 child
->separate_debug_objfile_link
=
574 objfile
->separate_debug_objfile_link
;
577 child
= child
->separate_debug_objfile_link
;
583 /* Remove any references to this objfile in the global value
585 preserve_values (objfile
);
587 /* First do any symbol file specific actions required when we are
588 finished with a particular symbol file. Note that if the objfile
589 is using reusable symbol information (via mmalloc) then each of
590 these routines is responsible for doing the correct thing, either
591 freeing things which are valid only during this particular gdb
592 execution, or leaving them to be reused during the next one. */
594 if (objfile
->sf
!= NULL
)
596 (*objfile
->sf
->sym_finish
) (objfile
);
599 /* Discard any data modules have associated with the objfile. */
600 objfile_free_data (objfile
);
602 gdb_bfd_unref (objfile
->obfd
);
604 /* Remove it from the chain of all objfiles. */
606 unlink_objfile (objfile
);
608 if (objfile
== symfile_objfile
)
609 symfile_objfile
= NULL
;
611 if (objfile
== rt_common_objfile
)
612 rt_common_objfile
= NULL
;
614 /* Before the symbol table code was redone to make it easier to
615 selectively load and remove information particular to a specific
616 linkage unit, gdb used to do these things whenever the monolithic
617 symbol table was blown away. How much still needs to be done
618 is unknown, but we play it safe for now and keep each action until
619 it is shown to be no longer needed. */
621 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
622 for example), so we need to call this here. */
623 clear_pc_function_cache ();
625 /* Clear globals which might have pointed into a removed objfile.
626 FIXME: It's not clear which of these are supposed to persist
627 between expressions and which ought to be reset each time. */
628 expression_context_block
= NULL
;
629 innermost_block
= NULL
;
631 /* Check to see if the current_source_symtab belongs to this objfile,
632 and if so, call clear_current_source_symtab_and_line. */
635 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
638 ALL_OBJFILE_SYMTABS (objfile
, s
)
640 if (s
== cursal
.symtab
)
641 clear_current_source_symtab_and_line ();
645 /* The last thing we do is free the objfile struct itself. */
647 if (objfile
->name
!= NULL
)
649 xfree (objfile
->name
);
651 if (objfile
->global_psymbols
.list
)
652 xfree (objfile
->global_psymbols
.list
);
653 if (objfile
->static_psymbols
.list
)
654 xfree (objfile
->static_psymbols
.list
);
655 /* Free the obstacks for non-reusable objfiles */
656 bcache_xfree (objfile
->psymbol_cache
);
657 bcache_xfree (objfile
->macro_cache
);
658 bcache_xfree (objfile
->filename_cache
);
659 if (objfile
->demangled_names_hash
)
660 htab_delete (objfile
->demangled_names_hash
);
661 obstack_free (&objfile
->objfile_obstack
, 0);
663 /* Rebuild section map next time we need it. */
664 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
670 do_free_objfile_cleanup (void *obj
)
676 make_cleanup_free_objfile (struct objfile
*obj
)
678 return make_cleanup (do_free_objfile_cleanup
, obj
);
681 /* Free all the object files at once and clean up their users. */
684 free_all_objfiles (void)
686 struct objfile
*objfile
, *temp
;
688 ALL_OBJFILES_SAFE (objfile
, temp
)
690 free_objfile (objfile
);
692 clear_symtab_users ();
695 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
696 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
697 Return non-zero iff any change happened. */
700 objfile_relocate1 (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
702 struct obj_section
*s
;
703 struct section_offsets
*delta
=
704 ((struct section_offsets
*)
705 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
709 int something_changed
= 0;
710 for (i
= 0; i
< objfile
->num_sections
; ++i
)
713 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
714 if (ANOFFSET (delta
, i
) != 0)
715 something_changed
= 1;
717 if (!something_changed
)
721 /* OK, get all the symtabs. */
725 ALL_OBJFILE_SYMTABS (objfile
, s
)
728 struct blockvector
*bv
;
731 /* First the line table. */
735 for (i
= 0; i
< l
->nitems
; ++i
)
736 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
739 /* Don't relocate a shared blockvector more than once. */
743 bv
= BLOCKVECTOR (s
);
744 if (BLOCKVECTOR_MAP (bv
))
745 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
746 ANOFFSET (delta
, s
->block_line_section
));
748 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
752 struct dict_iterator iter
;
754 b
= BLOCKVECTOR_BLOCK (bv
, i
);
755 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
756 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
758 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
760 fixup_symbol_section (sym
, objfile
);
762 /* The RS6000 code from which this was taken skipped
763 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
764 But I'm leaving out that test, on the theory that
765 they can't possibly pass the tests below. */
766 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
767 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
768 && SYMBOL_SECTION (sym
) >= 0)
770 SYMBOL_VALUE_ADDRESS (sym
) +=
771 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
778 if (objfile
->psymtabs_addrmap
)
779 addrmap_relocate (objfile
->psymtabs_addrmap
,
780 ANOFFSET (delta
, SECT_OFF_TEXT (objfile
)));
783 struct partial_symtab
*p
;
785 ALL_OBJFILE_PSYMTABS (objfile
, p
)
787 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
788 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
793 struct partial_symbol
**psym
;
795 for (psym
= objfile
->global_psymbols
.list
;
796 psym
< objfile
->global_psymbols
.next
;
799 fixup_psymbol_section (*psym
, objfile
);
800 if (SYMBOL_SECTION (*psym
) >= 0)
801 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
802 SYMBOL_SECTION (*psym
));
804 for (psym
= objfile
->static_psymbols
.list
;
805 psym
< objfile
->static_psymbols
.next
;
808 fixup_psymbol_section (*psym
, objfile
);
809 if (SYMBOL_SECTION (*psym
) >= 0)
810 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
811 SYMBOL_SECTION (*psym
));
816 struct minimal_symbol
*msym
;
817 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
818 if (SYMBOL_SECTION (msym
) >= 0)
819 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
821 /* Relocating different sections by different amounts may cause the symbols
822 to be out of order. */
823 msymbols_sort (objfile
);
825 if (objfile
->ei
.entry_point_p
)
827 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
828 only as a fallback. */
829 struct obj_section
*s
;
830 s
= find_pc_section (objfile
->ei
.entry_point
);
832 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
834 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
839 for (i
= 0; i
< objfile
->num_sections
; ++i
)
840 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
843 /* Rebuild section map next time we need it. */
844 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
846 /* Update the table in exec_ops, used to read memory. */
847 ALL_OBJFILE_OSECTIONS (objfile
, s
)
849 int idx
= s
->the_bfd_section
->index
;
851 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
852 obj_section_addr (s
));
859 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
860 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
862 The number and ordering of sections does differ between the two objfiles.
863 Only their names match. Also the file offsets will differ (objfile being
864 possibly prelinked but separate_debug_objfile is probably not prelinked) but
865 the in-memory absolute address as specified by NEW_OFFSETS must match both
869 objfile_relocate (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
871 struct objfile
*debug_objfile
;
874 changed
|= objfile_relocate1 (objfile
, new_offsets
);
876 for (debug_objfile
= objfile
->separate_debug_objfile
;
878 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
880 struct section_addr_info
*objfile_addrs
;
881 struct section_offsets
*new_debug_offsets
;
882 int new_debug_num_sections
;
883 struct cleanup
*my_cleanups
;
885 objfile_addrs
= build_section_addr_info_from_objfile (objfile
);
886 my_cleanups
= make_cleanup (xfree
, objfile_addrs
);
888 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
889 relative ones must be already created according to debug_objfile. */
891 addr_info_make_relative (objfile_addrs
, debug_objfile
->obfd
);
893 gdb_assert (debug_objfile
->num_sections
894 == bfd_count_sections (debug_objfile
->obfd
));
895 new_debug_offsets
= xmalloc (SIZEOF_N_SECTION_OFFSETS
896 (debug_objfile
->num_sections
));
897 make_cleanup (xfree
, new_debug_offsets
);
898 relative_addr_info_to_section_offsets (new_debug_offsets
,
899 debug_objfile
->num_sections
,
902 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
);
904 do_cleanups (my_cleanups
);
907 /* Relocate breakpoints as necessary, after things are relocated. */
909 breakpoint_re_set ();
912 /* Return non-zero if OBJFILE has partial symbols. */
915 objfile_has_partial_symbols (struct objfile
*objfile
)
917 return objfile
->psymtabs
!= NULL
;
920 /* Return non-zero if OBJFILE has full symbols. */
923 objfile_has_full_symbols (struct objfile
*objfile
)
925 return objfile
->symtabs
!= NULL
;
928 /* Return non-zero if OBJFILE has full or partial symbols, either directly
929 or through a separate debug file. */
932 objfile_has_symbols (struct objfile
*objfile
)
936 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
937 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
943 /* Many places in gdb want to test just to see if we have any partial
944 symbols available. This function returns zero if none are currently
945 available, nonzero otherwise. */
948 have_partial_symbols (void)
954 if (objfile_has_partial_symbols (ofp
))
960 /* Many places in gdb want to test just to see if we have any full
961 symbols available. This function returns zero if none are currently
962 available, nonzero otherwise. */
965 have_full_symbols (void)
971 if (objfile_has_full_symbols (ofp
))
978 /* This operations deletes all objfile entries that represent solibs that
979 weren't explicitly loaded by the user, via e.g., the add-symbol-file
983 objfile_purge_solibs (void)
985 struct objfile
*objf
;
986 struct objfile
*temp
;
988 ALL_OBJFILES_SAFE (objf
, temp
)
990 /* We assume that the solib package has been purged already, or will
993 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
999 /* Many places in gdb want to test just to see if we have any minimal
1000 symbols available. This function returns zero if none are currently
1001 available, nonzero otherwise. */
1004 have_minimal_symbols (void)
1006 struct objfile
*ofp
;
1010 if (ofp
->minimal_symbol_count
> 0)
1018 /* Qsort comparison function. */
1021 qsort_cmp (const void *a
, const void *b
)
1023 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1024 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1025 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1026 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1028 if (sect1_addr
< sect2_addr
)
1030 else if (sect1_addr
> sect2_addr
)
1034 /* Sections are at the same address. This could happen if
1035 A) we have an objfile and a separate debuginfo.
1036 B) we are confused, and have added sections without proper relocation,
1037 or something like that. */
1039 const struct objfile
*const objfile1
= sect1
->objfile
;
1040 const struct objfile
*const objfile2
= sect2
->objfile
;
1042 if (objfile1
->separate_debug_objfile
== objfile2
1043 || objfile2
->separate_debug_objfile
== objfile1
)
1045 /* Case A. The ordering doesn't matter: separate debuginfo files
1046 will be filtered out later. */
1051 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1052 triage. This section could be slow (since we iterate over all
1053 objfiles in each call to qsort_cmp), but this shouldn't happen
1054 very often (GDB is already in a confused state; one hopes this
1055 doesn't happen at all). If you discover that significant time is
1056 spent in the loops below, do 'set complaints 100' and examine the
1057 resulting complaints. */
1059 if (objfile1
== objfile2
)
1061 /* Both sections came from the same objfile. We are really confused.
1062 Sort on sequence order of sections within the objfile. */
1064 const struct obj_section
*osect
;
1066 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1069 else if (osect
== sect2
)
1072 /* We should have found one of the sections before getting here. */
1077 /* Sort on sequence number of the objfile in the chain. */
1079 const struct objfile
*objfile
;
1081 ALL_OBJFILES (objfile
)
1082 if (objfile
== objfile1
)
1084 else if (objfile
== objfile2
)
1087 /* We should have found one of the objfiles before getting here. */
1098 /* Select "better" obj_section to keep. We prefer the one that came from
1099 the real object, rather than the one from separate debuginfo.
1100 Most of the time the two sections are exactly identical, but with
1101 prelinking the .rel.dyn section in the real object may have different
1104 static struct obj_section
*
1105 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1107 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1108 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1109 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1110 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1111 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1113 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1118 /* Return 1 if SECTION should be inserted into the section map.
1119 We want to insert only non-overlay and non-TLS section. */
1122 insert_section_p (const struct bfd
*abfd
,
1123 const struct bfd_section
*section
)
1125 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1127 if (lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1128 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1129 /* This is an overlay section. IN_MEMORY check is needed to avoid
1130 discarding sections from the "system supplied DSO" (aka vdso)
1131 on some Linux systems (e.g. Fedora 11). */
1133 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1134 /* This is a TLS section. */
1140 /* Filter out overlapping sections where one section came from the real
1141 objfile, and the other from a separate debuginfo file.
1142 Return the size of table after redundant sections have been eliminated. */
1145 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1149 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1151 struct obj_section
*const sect1
= map
[i
];
1152 struct obj_section
*const sect2
= map
[i
+ 1];
1153 const struct objfile
*const objfile1
= sect1
->objfile
;
1154 const struct objfile
*const objfile2
= sect2
->objfile
;
1155 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1156 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1158 if (sect1_addr
== sect2_addr
1159 && (objfile1
->separate_debug_objfile
== objfile2
1160 || objfile2
->separate_debug_objfile
== objfile1
))
1162 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1171 gdb_assert (i
== map_size
- 1);
1175 /* The map should not have shrunk to less than half the original size. */
1176 gdb_assert (map_size
/ 2 <= j
);
1181 /* Filter out overlapping sections, issuing a warning if any are found.
1182 Overlapping sections could really be overlay sections which we didn't
1183 classify as such in insert_section_p, or we could be dealing with a
1187 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1191 for (i
= 0, j
= 0; i
< map_size
- 1; )
1196 for (k
= i
+ 1; k
< map_size
; k
++)
1198 struct obj_section
*const sect1
= map
[i
];
1199 struct obj_section
*const sect2
= map
[k
];
1200 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1201 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1202 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1204 gdb_assert (sect1_addr
<= sect2_addr
);
1206 if (sect1_endaddr
<= sect2_addr
)
1210 /* We have an overlap. Report it. */
1212 struct objfile
*const objf1
= sect1
->objfile
;
1213 struct objfile
*const objf2
= sect2
->objfile
;
1215 const struct bfd
*const abfd1
= objf1
->obfd
;
1216 const struct bfd
*const abfd2
= objf2
->obfd
;
1218 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1219 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1221 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1223 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1225 complaint (&symfile_complaints
,
1226 _("unexpected overlap between:\n"
1227 " (A) section `%s' from `%s' [%s, %s)\n"
1228 " (B) section `%s' from `%s' [%s, %s).\n"
1229 "Will ignore section B"),
1230 bfd_section_name (abfd1
, bfds1
), objf1
->name
,
1231 paddress (gdbarch
, sect1_addr
),
1232 paddress (gdbarch
, sect1_endaddr
),
1233 bfd_section_name (abfd2
, bfds2
), objf2
->name
,
1234 paddress (gdbarch
, sect2_addr
),
1235 paddress (gdbarch
, sect2_endaddr
));
1243 gdb_assert (i
== map_size
- 1);
1251 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1252 TLS, overlay and overlapping sections. */
1255 update_section_map (struct program_space
*pspace
,
1256 struct obj_section
***pmap
, int *pmap_size
)
1258 int alloc_size
, map_size
, i
;
1259 struct obj_section
*s
, **map
;
1260 struct objfile
*objfile
;
1262 gdb_assert (get_objfile_pspace_data (pspace
)->objfiles_changed_p
!= 0);
1268 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1269 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1270 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1273 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1274 if (alloc_size
== 0)
1281 map
= xmalloc (alloc_size
* sizeof (*map
));
1284 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1285 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1286 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1289 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1290 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1291 map_size
= filter_overlapping_sections(map
, map_size
);
1293 if (map_size
< alloc_size
)
1294 /* Some sections were eliminated. Trim excess space. */
1295 map
= xrealloc (map
, map_size
* sizeof (*map
));
1297 gdb_assert (alloc_size
== map_size
);
1300 *pmap_size
= map_size
;
1303 /* Bsearch comparison function. */
1306 bsearch_cmp (const void *key
, const void *elt
)
1308 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1309 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1311 if (pc
< obj_section_addr (section
))
1313 if (pc
< obj_section_endaddr (section
))
1318 /* Returns a section whose range includes PC or NULL if none found. */
1320 struct obj_section
*
1321 find_pc_section (CORE_ADDR pc
)
1323 struct objfile_pspace_info
*pspace_info
;
1324 struct obj_section
*s
, **sp
;
1326 /* Check for mapped overlay section first. */
1327 s
= find_pc_mapped_section (pc
);
1331 pspace_info
= get_objfile_pspace_data (current_program_space
);
1332 if (pspace_info
->objfiles_changed_p
!= 0)
1334 update_section_map (current_program_space
,
1335 &pspace_info
->sections
,
1336 &pspace_info
->num_sections
);
1338 /* Don't need updates to section map until objfiles are added,
1339 removed or relocated. */
1340 pspace_info
->objfiles_changed_p
= 0;
1343 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1344 bsearch be non-NULL. */
1345 if (pspace_info
->sections
== NULL
)
1347 gdb_assert (pspace_info
->num_sections
== 0);
1351 sp
= (struct obj_section
**) bsearch (&pc
,
1352 pspace_info
->sections
,
1353 pspace_info
->num_sections
,
1354 sizeof (*pspace_info
->sections
),
1362 /* In SVR4, we recognize a trampoline by it's section name.
1363 That is, if the pc is in a section named ".plt" then we are in
1367 in_plt_section (CORE_ADDR pc
, char *name
)
1369 struct obj_section
*s
;
1372 s
= find_pc_section (pc
);
1375 && s
->the_bfd_section
->name
!= NULL
1376 && strcmp (s
->the_bfd_section
->name
, ".plt") == 0);
1381 /* Keep a registry of per-objfile data-pointers required by other GDB
1387 void (*save
) (struct objfile
*, void *);
1388 void (*free
) (struct objfile
*, void *);
1391 struct objfile_data_registration
1393 struct objfile_data
*data
;
1394 struct objfile_data_registration
*next
;
1397 struct objfile_data_registry
1399 struct objfile_data_registration
*registrations
;
1400 unsigned num_registrations
;
1403 static struct objfile_data_registry objfile_data_registry
= { NULL
, 0 };
1405 const struct objfile_data
*
1406 register_objfile_data_with_cleanup (void (*save
) (struct objfile
*, void *),
1407 void (*free
) (struct objfile
*, void *))
1409 struct objfile_data_registration
**curr
;
1411 /* Append new registration. */
1412 for (curr
= &objfile_data_registry
.registrations
;
1413 *curr
!= NULL
; curr
= &(*curr
)->next
);
1415 *curr
= XMALLOC (struct objfile_data_registration
);
1416 (*curr
)->next
= NULL
;
1417 (*curr
)->data
= XMALLOC (struct objfile_data
);
1418 (*curr
)->data
->index
= objfile_data_registry
.num_registrations
++;
1419 (*curr
)->data
->save
= save
;
1420 (*curr
)->data
->free
= free
;
1422 return (*curr
)->data
;
1425 const struct objfile_data
*
1426 register_objfile_data (void)
1428 return register_objfile_data_with_cleanup (NULL
, NULL
);
1432 objfile_alloc_data (struct objfile
*objfile
)
1434 gdb_assert (objfile
->data
== NULL
);
1435 objfile
->num_data
= objfile_data_registry
.num_registrations
;
1436 objfile
->data
= XCALLOC (objfile
->num_data
, void *);
1440 objfile_free_data (struct objfile
*objfile
)
1442 gdb_assert (objfile
->data
!= NULL
);
1443 clear_objfile_data (objfile
);
1444 xfree (objfile
->data
);
1445 objfile
->data
= NULL
;
1449 clear_objfile_data (struct objfile
*objfile
)
1451 struct objfile_data_registration
*registration
;
1454 gdb_assert (objfile
->data
!= NULL
);
1456 /* Process all the save handlers. */
1458 for (registration
= objfile_data_registry
.registrations
, i
= 0;
1459 i
< objfile
->num_data
;
1460 registration
= registration
->next
, i
++)
1461 if (objfile
->data
[i
] != NULL
&& registration
->data
->save
!= NULL
)
1462 registration
->data
->save (objfile
, objfile
->data
[i
]);
1464 /* Now process all the free handlers. */
1466 for (registration
= objfile_data_registry
.registrations
, i
= 0;
1467 i
< objfile
->num_data
;
1468 registration
= registration
->next
, i
++)
1469 if (objfile
->data
[i
] != NULL
&& registration
->data
->free
!= NULL
)
1470 registration
->data
->free (objfile
, objfile
->data
[i
]);
1472 memset (objfile
->data
, 0, objfile
->num_data
* sizeof (void *));
1476 set_objfile_data (struct objfile
*objfile
, const struct objfile_data
*data
,
1479 gdb_assert (data
->index
< objfile
->num_data
);
1480 objfile
->data
[data
->index
] = value
;
1484 objfile_data (struct objfile
*objfile
, const struct objfile_data
*data
)
1486 gdb_assert (data
->index
< objfile
->num_data
);
1487 return objfile
->data
[data
->index
];
1490 /* Set objfiles_changed_p so section map will be rebuilt next time it
1491 is used. Called by reread_symbols. */
1494 objfiles_changed (void)
1496 /* Rebuild section map next time we need it. */
1497 get_objfile_pspace_data (current_program_space
)->objfiles_changed_p
= 1;
1500 /* Add reference to ABFD. Returns ABFD. */
1502 gdb_bfd_ref (struct bfd
*abfd
)
1504 int *p_refcount
= bfd_usrdata (abfd
);
1506 if (p_refcount
!= NULL
)
1512 p_refcount
= xmalloc (sizeof (*p_refcount
));
1514 bfd_usrdata (abfd
) = p_refcount
;
1519 /* Unreference and possibly close ABFD. */
1521 gdb_bfd_unref (struct bfd
*abfd
)
1529 p_refcount
= bfd_usrdata (abfd
);
1531 /* Valid range for p_refcount: a pointer to int counter, which has a
1532 value of 1 (single owner) or 2 (shared). */
1533 gdb_assert (*p_refcount
== 1 || *p_refcount
== 2);
1536 if (*p_refcount
> 0)
1540 bfd_usrdata (abfd
) = NULL
; /* Paranoia. */
1542 name
= bfd_get_filename (abfd
);
1543 if (!bfd_close (abfd
))
1544 warning (_("cannot close \"%s\": %s"),
1545 name
, bfd_errmsg (bfd_get_error ()));
1549 /* Provide a prototype to silence -Wmissing-prototypes. */
1550 extern initialize_file_ftype _initialize_objfiles
;
1553 _initialize_objfiles (void)
1555 objfiles_pspace_data
1556 = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup
);