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, 2011
5 Free Software Foundation, Inc.
7 Contributed by Cygnus Support, using pieces from other GDB modules.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 /* This file contains support routines for creating, manipulating, and
25 destroying objfile structures. */
28 #include "bfd.h" /* Binary File Description */
32 #include "gdb-stabs.h"
35 #include "mdebugread.h"
36 #include "expression.h"
37 #include "parser-defs.h"
39 #include "gdb_assert.h"
40 #include <sys/types.h>
43 #include "gdb_obstack.h"
44 #include "gdb_string.h"
47 #include "breakpoint.h"
49 #include "dictionary.h"
52 #include "arch-utils.h"
55 #include "complaints.h"
59 /* Prototypes for local functions */
61 static void objfile_alloc_data (struct objfile
*objfile
);
62 static void objfile_free_data (struct objfile
*objfile
);
64 /* Externally visible variables that are owned by this module.
65 See declarations in objfile.h for more info. */
67 struct objfile
*current_objfile
; /* For symbol file being read in */
68 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
70 struct objfile_pspace_info
72 int objfiles_changed_p
;
73 struct obj_section
**sections
;
77 /* Per-program-space data key. */
78 static const struct program_space_data
*objfiles_pspace_data
;
81 objfiles_pspace_data_cleanup (struct program_space
*pspace
, void *arg
)
83 struct objfile_pspace_info
*info
;
85 info
= program_space_data (pspace
, objfiles_pspace_data
);
88 xfree (info
->sections
);
93 /* Get the current svr4 data. If none is found yet, add it now. This
94 function always returns a valid object. */
96 static struct objfile_pspace_info
*
97 get_objfile_pspace_data (struct program_space
*pspace
)
99 struct objfile_pspace_info
*info
;
101 info
= program_space_data (pspace
, objfiles_pspace_data
);
104 info
= XZALLOC (struct objfile_pspace_info
);
105 set_program_space_data (pspace
, objfiles_pspace_data
, info
);
111 /* Records whether any objfiles appeared or disappeared since we last updated
112 address to obj section map. */
114 /* Locate all mappable sections of a BFD file.
115 objfile_p_char is a char * to get it through
116 bfd_map_over_sections; we cast it back to its proper type. */
118 /* Called via bfd_map_over_sections to build up the section table that
119 the objfile references. The objfile contains pointers to the start
120 of the table (objfile->sections) and to the first location after
121 the end of the table (objfile->sections_end). */
124 add_to_objfile_sections (struct bfd
*abfd
, struct bfd_section
*asect
,
125 void *objfile_p_char
)
127 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
128 struct obj_section section
;
131 aflag
= bfd_get_section_flags (abfd
, asect
);
133 if (!(aflag
& SEC_ALLOC
))
136 if (0 == bfd_section_size (abfd
, asect
))
138 section
.objfile
= objfile
;
139 section
.the_bfd_section
= asect
;
140 section
.ovly_mapped
= 0;
141 obstack_grow (&objfile
->objfile_obstack
,
142 (char *) §ion
, sizeof (section
));
143 objfile
->sections_end
144 = (struct obj_section
*) (((size_t) objfile
->sections_end
) + 1);
147 /* Builds a section table for OBJFILE.
148 Returns 0 if OK, 1 on error (in which case bfd_error contains the
151 Note that while we are building the table, which goes into the
152 psymbol obstack, we hijack the sections_end pointer to instead hold
153 a count of the number of sections. When bfd_map_over_sections
154 returns, this count is used to compute the pointer to the end of
155 the sections table, which then overwrites the count.
157 Also note that the OFFSET and OVLY_MAPPED in each table entry
158 are initialized to zero.
160 Also note that if anything else writes to the psymbol obstack while
161 we are building the table, we're pretty much hosed. */
164 build_objfile_section_table (struct objfile
*objfile
)
166 /* objfile->sections can be already set when reading a mapped symbol
167 file. I believe that we do need to rebuild the section table in
168 this case (we rebuild other things derived from the bfd), but we
169 can't free the old one (it's in the objfile_obstack). So we just
170 waste some memory. */
172 objfile
->sections_end
= 0;
173 bfd_map_over_sections (objfile
->obfd
,
174 add_to_objfile_sections
, (void *) objfile
);
175 objfile
->sections
= obstack_finish (&objfile
->objfile_obstack
);
176 objfile
->sections_end
= objfile
->sections
+ (size_t) objfile
->sections_end
;
180 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
181 allocate a new objfile struct, fill it in as best we can, link it
182 into the list of all known objfiles, and return a pointer to the
185 The FLAGS word contains various bits (OBJF_*) that can be taken as
186 requests for specific operations. Other bits like OBJF_SHARED are
187 simply copied through to the new objfile flags member. */
189 /* NOTE: carlton/2003-02-04: This function is called with args NULL, 0
190 by jv-lang.c, to create an artificial objfile used to hold
191 information about dynamically-loaded Java classes. Unfortunately,
192 that branch of this function doesn't get tested very frequently, so
193 it's prone to breakage. (E.g. at one time the name was set to NULL
194 in that situation, which broke a loop over all names in the dynamic
195 library loader.) If you change this function, please try to leave
196 things in a consistent state even if abfd is NULL. */
199 allocate_objfile (bfd
*abfd
, int flags
)
201 struct objfile
*objfile
;
203 objfile
= (struct objfile
*) xzalloc (sizeof (struct objfile
));
204 objfile
->psymbol_cache
= psymbol_bcache_init ();
205 objfile
->macro_cache
= bcache_xmalloc (NULL
, NULL
);
206 objfile
->filename_cache
= bcache_xmalloc (NULL
, NULL
);
207 /* We could use obstack_specify_allocation here instead, but
208 gdb_obstack.h specifies the alloc/dealloc functions. */
209 obstack_init (&objfile
->objfile_obstack
);
210 terminate_minimal_symbol_table (objfile
);
212 objfile_alloc_data (objfile
);
214 /* Update the per-objfile information that comes from the bfd, ensuring
215 that any data that is reference is saved in the per-objfile data
218 objfile
->obfd
= gdb_bfd_ref (abfd
);
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 /* Add this file onto the tail of the linked list of other such files. */
252 objfile
->next
= NULL
;
253 if (object_files
== NULL
)
254 object_files
= objfile
;
257 struct objfile
*last_one
;
259 for (last_one
= object_files
;
261 last_one
= last_one
->next
);
262 last_one
->next
= objfile
;
265 /* Save passed in flag bits. */
266 objfile
->flags
|= flags
;
268 /* Rebuild section map next time we need it. */
269 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
274 /* Retrieve the gdbarch associated with OBJFILE. */
276 get_objfile_arch (struct objfile
*objfile
)
278 return objfile
->gdbarch
;
281 /* Initialize entry point information for this objfile. */
284 init_entry_point_info (struct objfile
*objfile
)
286 /* Save startup file's range of PC addresses to help blockframe.c
287 decide where the bottom of the stack is. */
289 if (bfd_get_file_flags (objfile
->obfd
) & EXEC_P
)
291 /* Executable file -- record its entry point so we'll recognize
292 the startup file because it contains the entry point. */
293 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
294 objfile
->ei
.entry_point_p
= 1;
296 else if (bfd_get_file_flags (objfile
->obfd
) & DYNAMIC
297 && bfd_get_start_address (objfile
->obfd
) != 0)
299 /* Some shared libraries may have entry points set and be
300 runnable. There's no clear way to indicate this, so just check
301 for values other than zero. */
302 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
303 objfile
->ei
.entry_point_p
= 1;
307 /* Examination of non-executable.o files. Short-circuit this stuff. */
308 objfile
->ei
.entry_point_p
= 0;
312 /* If there is a valid and known entry point, function fills *ENTRY_P with it
313 and returns non-zero; otherwise it returns zero. */
316 entry_point_address_query (CORE_ADDR
*entry_p
)
318 struct gdbarch
*gdbarch
;
319 CORE_ADDR entry_point
;
321 if (symfile_objfile
== NULL
|| !symfile_objfile
->ei
.entry_point_p
)
324 gdbarch
= get_objfile_arch (symfile_objfile
);
326 entry_point
= symfile_objfile
->ei
.entry_point
;
328 /* Make certain that the address points at real code, and not a
329 function descriptor. */
330 entry_point
= gdbarch_convert_from_func_ptr_addr (gdbarch
, entry_point
,
333 /* Remove any ISA markers, so that this matches entries in the
335 entry_point
= gdbarch_addr_bits_remove (gdbarch
, entry_point
);
337 *entry_p
= entry_point
;
341 /* Get current entry point address. Call error if it is not known. */
344 entry_point_address (void)
348 if (!entry_point_address_query (&retval
))
349 error (_("Entry point address is not known."));
354 /* Create the terminating entry of OBJFILE's minimal symbol table.
355 If OBJFILE->msymbols is zero, allocate a single entry from
356 OBJFILE->objfile_obstack; otherwise, just initialize
357 OBJFILE->msymbols[OBJFILE->minimal_symbol_count]. */
359 terminate_minimal_symbol_table (struct objfile
*objfile
)
361 if (! objfile
->msymbols
)
362 objfile
->msymbols
= ((struct minimal_symbol
*)
363 obstack_alloc (&objfile
->objfile_obstack
,
364 sizeof (objfile
->msymbols
[0])));
367 struct minimal_symbol
*m
368 = &objfile
->msymbols
[objfile
->minimal_symbol_count
];
370 memset (m
, 0, sizeof (*m
));
371 /* Don't rely on these enumeration values being 0's. */
372 MSYMBOL_TYPE (m
) = mst_unknown
;
373 SYMBOL_SET_LANGUAGE (m
, language_unknown
);
377 /* Iterator on PARENT and every separate debug objfile of PARENT.
378 The usage pattern is:
379 for (objfile = parent;
381 objfile = objfile_separate_debug_iterate (parent, objfile))
386 objfile_separate_debug_iterate (const struct objfile
*parent
,
387 const struct objfile
*objfile
)
391 /* If any, return the first child. */
392 res
= objfile
->separate_debug_objfile
;
396 /* Common case where there is no separate debug objfile. */
397 if (objfile
== parent
)
400 /* Return the brother if any. Note that we don't iterate on brothers of
402 res
= objfile
->separate_debug_objfile_link
;
406 for (res
= objfile
->separate_debug_objfile_backlink
;
408 res
= res
->separate_debug_objfile_backlink
)
410 gdb_assert (res
!= NULL
);
411 if (res
->separate_debug_objfile_link
)
412 return res
->separate_debug_objfile_link
;
417 /* Put one object file before a specified on in the global list.
418 This can be used to make sure an object file is destroyed before
419 another when using ALL_OBJFILES_SAFE to free all objfiles. */
421 put_objfile_before (struct objfile
*objfile
, struct objfile
*before_this
)
423 struct objfile
**objp
;
425 unlink_objfile (objfile
);
427 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
429 if (*objp
== before_this
)
431 objfile
->next
= *objp
;
437 internal_error (__FILE__
, __LINE__
,
438 _("put_objfile_before: before objfile not in list"));
441 /* Put OBJFILE at the front of the list. */
444 objfile_to_front (struct objfile
*objfile
)
446 struct objfile
**objp
;
447 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
449 if (*objp
== objfile
)
451 /* Unhook it from where it is. */
452 *objp
= objfile
->next
;
453 /* Put it in the front. */
454 objfile
->next
= object_files
;
455 object_files
= objfile
;
461 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
464 It is not a bug, or error, to call this function if OBJFILE is not known
465 to be in the current list. This is done in the case of mapped objfiles,
466 for example, just to ensure that the mapped objfile doesn't appear twice
467 in the list. Since the list is threaded, linking in a mapped objfile
468 twice would create a circular list.
470 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
471 unlinking it, just to ensure that we have completely severed any linkages
472 between the OBJFILE and the list. */
475 unlink_objfile (struct objfile
*objfile
)
477 struct objfile
**objpp
;
479 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
481 if (*objpp
== objfile
)
483 *objpp
= (*objpp
)->next
;
484 objfile
->next
= NULL
;
489 internal_error (__FILE__
, __LINE__
,
490 _("unlink_objfile: objfile already unlinked"));
493 /* Add OBJFILE as a separate debug objfile of PARENT. */
496 add_separate_debug_objfile (struct objfile
*objfile
, struct objfile
*parent
)
498 gdb_assert (objfile
&& parent
);
500 /* Must not be already in a list. */
501 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
502 gdb_assert (objfile
->separate_debug_objfile_link
== NULL
);
504 objfile
->separate_debug_objfile_backlink
= parent
;
505 objfile
->separate_debug_objfile_link
= parent
->separate_debug_objfile
;
506 parent
->separate_debug_objfile
= objfile
;
508 /* Put the separate debug object before the normal one, this is so that
509 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
510 put_objfile_before (objfile
, parent
);
513 /* Free all separate debug objfile of OBJFILE, but don't free OBJFILE
517 free_objfile_separate_debug (struct objfile
*objfile
)
519 struct objfile
*child
;
521 for (child
= objfile
->separate_debug_objfile
; child
;)
523 struct objfile
*next_child
= child
->separate_debug_objfile_link
;
524 free_objfile (child
);
529 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
530 that as much as possible is allocated on the objfile_obstack
531 so that the memory can be efficiently freed.
533 Things which we do NOT free because they are not in malloc'd memory
534 or not in memory specific to the objfile include:
538 FIXME: If the objfile is using reusable symbol information (via mmalloc),
539 then we need to take into account the fact that more than one process
540 may be using the symbol information at the same time (when mmalloc is
541 extended to support cooperative locking). When more than one process
542 is using the mapped symbol info, we need to be more careful about when
543 we free objects in the reusable area. */
546 free_objfile (struct objfile
*objfile
)
548 /* Free all separate debug objfiles. */
549 free_objfile_separate_debug (objfile
);
551 if (objfile
->separate_debug_objfile_backlink
)
553 /* We freed the separate debug file, make sure the base objfile
554 doesn't reference it. */
555 struct objfile
*child
;
557 child
= objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
;
559 if (child
== objfile
)
561 /* OBJFILE is the first child. */
562 objfile
->separate_debug_objfile_backlink
->separate_debug_objfile
=
563 objfile
->separate_debug_objfile_link
;
567 /* Find OBJFILE in the list. */
570 if (child
->separate_debug_objfile_link
== objfile
)
572 child
->separate_debug_objfile_link
=
573 objfile
->separate_debug_objfile_link
;
576 child
= child
->separate_debug_objfile_link
;
582 /* Remove any references to this objfile in the global value
584 preserve_values (objfile
);
586 /* First do any symbol file specific actions required when we are
587 finished with a particular symbol file. Note that if the objfile
588 is using reusable symbol information (via mmalloc) then each of
589 these routines is responsible for doing the correct thing, either
590 freeing things which are valid only during this particular gdb
591 execution, or leaving them to be reused during the next one. */
593 if (objfile
->sf
!= NULL
)
595 (*objfile
->sf
->sym_finish
) (objfile
);
598 /* Discard any data modules have associated with the objfile. */
599 objfile_free_data (objfile
);
601 gdb_bfd_unref (objfile
->obfd
);
603 /* Remove it from the chain of all objfiles. */
605 unlink_objfile (objfile
);
607 if (objfile
== symfile_objfile
)
608 symfile_objfile
= NULL
;
610 if (objfile
== rt_common_objfile
)
611 rt_common_objfile
= NULL
;
613 /* Before the symbol table code was redone to make it easier to
614 selectively load and remove information particular to a specific
615 linkage unit, gdb used to do these things whenever the monolithic
616 symbol table was blown away. How much still needs to be done
617 is unknown, but we play it safe for now and keep each action until
618 it is shown to be no longer needed. */
620 /* Not all our callers call clear_symtab_users (objfile_purge_solibs,
621 for example), so we need to call this here. */
622 clear_pc_function_cache ();
624 /* Clear globals which might have pointed into a removed objfile.
625 FIXME: It's not clear which of these are supposed to persist
626 between expressions and which ought to be reset each time. */
627 expression_context_block
= NULL
;
628 innermost_block
= NULL
;
630 /* Check to see if the current_source_symtab belongs to this objfile,
631 and if so, call clear_current_source_symtab_and_line. */
634 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
636 if (cursal
.symtab
&& cursal
.symtab
->objfile
== objfile
)
637 clear_current_source_symtab_and_line ();
640 forget_cached_source_info_for_objfile (objfile
);
642 /* The last thing we do is free the objfile struct itself. */
644 xfree (objfile
->name
);
645 if (objfile
->global_psymbols
.list
)
646 xfree (objfile
->global_psymbols
.list
);
647 if (objfile
->static_psymbols
.list
)
648 xfree (objfile
->static_psymbols
.list
);
649 /* Free the obstacks for non-reusable objfiles. */
650 psymbol_bcache_free (objfile
->psymbol_cache
);
651 bcache_xfree (objfile
->macro_cache
);
652 bcache_xfree (objfile
->filename_cache
);
653 if (objfile
->demangled_names_hash
)
654 htab_delete (objfile
->demangled_names_hash
);
655 obstack_free (&objfile
->objfile_obstack
, 0);
657 /* Rebuild section map next time we need it. */
658 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
664 do_free_objfile_cleanup (void *obj
)
670 make_cleanup_free_objfile (struct objfile
*obj
)
672 return make_cleanup (do_free_objfile_cleanup
, obj
);
675 /* Free all the object files at once and clean up their users. */
678 free_all_objfiles (void)
680 struct objfile
*objfile
, *temp
;
683 /* Any objfile referencewould become stale. */
684 for (so
= master_so_list (); so
; so
= so
->next
)
685 gdb_assert (so
->objfile
== NULL
);
687 ALL_OBJFILES_SAFE (objfile
, temp
)
689 free_objfile (objfile
);
691 clear_symtab_users (0);
694 /* A helper function for objfile_relocate1 that relocates a single
698 relocate_one_symbol (struct symbol
*sym
, struct objfile
*objfile
,
699 struct section_offsets
*delta
)
701 fixup_symbol_section (sym
, objfile
);
703 /* The RS6000 code from which this was taken skipped
704 any symbols in STRUCT_DOMAIN or UNDEF_DOMAIN.
705 But I'm leaving out that test, on the theory that
706 they can't possibly pass the tests below. */
707 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
708 || SYMBOL_CLASS (sym
) == LOC_STATIC
)
709 && SYMBOL_SECTION (sym
) >= 0)
711 SYMBOL_VALUE_ADDRESS (sym
) += ANOFFSET (delta
, SYMBOL_SECTION (sym
));
715 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
716 entries in new_offsets. SEPARATE_DEBUG_OBJFILE is not touched here.
717 Return non-zero iff any change happened. */
720 objfile_relocate1 (struct objfile
*objfile
,
721 struct section_offsets
*new_offsets
)
723 struct obj_section
*s
;
724 struct section_offsets
*delta
=
725 ((struct section_offsets
*)
726 alloca (SIZEOF_N_SECTION_OFFSETS (objfile
->num_sections
)));
729 int something_changed
= 0;
731 for (i
= 0; i
< objfile
->num_sections
; ++i
)
734 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
735 if (ANOFFSET (delta
, i
) != 0)
736 something_changed
= 1;
738 if (!something_changed
)
741 /* OK, get all the symtabs. */
745 ALL_OBJFILE_SYMTABS (objfile
, s
)
748 struct blockvector
*bv
;
751 /* First the line table. */
755 for (i
= 0; i
< l
->nitems
; ++i
)
756 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
759 /* Don't relocate a shared blockvector more than once. */
763 bv
= BLOCKVECTOR (s
);
764 if (BLOCKVECTOR_MAP (bv
))
765 addrmap_relocate (BLOCKVECTOR_MAP (bv
),
766 ANOFFSET (delta
, s
->block_line_section
));
768 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
772 struct dict_iterator iter
;
774 b
= BLOCKVECTOR_BLOCK (bv
, i
);
775 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
776 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
778 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
780 relocate_one_symbol (sym
, objfile
, delta
);
786 /* Relocate isolated symbols. */
790 for (iter
= objfile
->template_symbols
; iter
; iter
= iter
->hash_next
)
791 relocate_one_symbol (iter
, objfile
, delta
);
794 if (objfile
->psymtabs_addrmap
)
795 addrmap_relocate (objfile
->psymtabs_addrmap
,
796 ANOFFSET (delta
, SECT_OFF_TEXT (objfile
)));
799 objfile
->sf
->qf
->relocate (objfile
, new_offsets
, delta
);
802 struct minimal_symbol
*msym
;
804 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
805 if (SYMBOL_SECTION (msym
) >= 0)
806 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
808 /* Relocating different sections by different amounts may cause the symbols
809 to be out of order. */
810 msymbols_sort (objfile
);
812 if (objfile
->ei
.entry_point_p
)
814 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
815 only as a fallback. */
816 struct obj_section
*s
;
817 s
= find_pc_section (objfile
->ei
.entry_point
);
819 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
821 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
827 for (i
= 0; i
< objfile
->num_sections
; ++i
)
828 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
831 /* Rebuild section map next time we need it. */
832 get_objfile_pspace_data (objfile
->pspace
)->objfiles_changed_p
= 1;
834 /* Update the table in exec_ops, used to read memory. */
835 ALL_OBJFILE_OSECTIONS (objfile
, s
)
837 int idx
= s
->the_bfd_section
->index
;
839 exec_set_section_address (bfd_get_filename (objfile
->obfd
), idx
,
840 obj_section_addr (s
));
847 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
848 entries in new_offsets. Process also OBJFILE's SEPARATE_DEBUG_OBJFILEs.
850 The number and ordering of sections does differ between the two objfiles.
851 Only their names match. Also the file offsets will differ (objfile being
852 possibly prelinked but separate_debug_objfile is probably not prelinked) but
853 the in-memory absolute address as specified by NEW_OFFSETS must match both
857 objfile_relocate (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
859 struct objfile
*debug_objfile
;
862 changed
|= objfile_relocate1 (objfile
, new_offsets
);
864 for (debug_objfile
= objfile
->separate_debug_objfile
;
866 debug_objfile
= objfile_separate_debug_iterate (objfile
, debug_objfile
))
868 struct section_addr_info
*objfile_addrs
;
869 struct section_offsets
*new_debug_offsets
;
870 struct cleanup
*my_cleanups
;
872 objfile_addrs
= build_section_addr_info_from_objfile (objfile
);
873 my_cleanups
= make_cleanup (xfree
, objfile_addrs
);
875 /* Here OBJFILE_ADDRS contain the correct absolute addresses, the
876 relative ones must be already created according to debug_objfile. */
878 addr_info_make_relative (objfile_addrs
, debug_objfile
->obfd
);
880 gdb_assert (debug_objfile
->num_sections
881 == bfd_count_sections (debug_objfile
->obfd
));
883 xmalloc (SIZEOF_N_SECTION_OFFSETS (debug_objfile
->num_sections
));
884 make_cleanup (xfree
, new_debug_offsets
);
885 relative_addr_info_to_section_offsets (new_debug_offsets
,
886 debug_objfile
->num_sections
,
889 changed
|= objfile_relocate1 (debug_objfile
, new_debug_offsets
);
891 do_cleanups (my_cleanups
);
894 /* Relocate breakpoints as necessary, after things are relocated. */
896 breakpoint_re_set ();
899 /* Return non-zero if OBJFILE has partial symbols. */
902 objfile_has_partial_symbols (struct objfile
*objfile
)
906 /* If we have not read psymbols, but we have a function capable of
907 reading them, then that is an indication that they are in fact
909 if ((objfile
->flags
& OBJF_PSYMTABS_READ
) == 0)
910 return objfile
->sf
->sym_read_psymbols
!= NULL
;
911 return objfile
->sf
->qf
->has_symbols (objfile
);
914 /* Return non-zero if OBJFILE has full symbols. */
917 objfile_has_full_symbols (struct objfile
*objfile
)
919 return objfile
->symtabs
!= NULL
;
922 /* Return non-zero if OBJFILE has full or partial symbols, either directly
923 or through a separate debug file. */
926 objfile_has_symbols (struct objfile
*objfile
)
930 for (o
= objfile
; o
; o
= objfile_separate_debug_iterate (objfile
, o
))
931 if (objfile_has_partial_symbols (o
) || objfile_has_full_symbols (o
))
937 /* Many places in gdb want to test just to see if we have any partial
938 symbols available. This function returns zero if none are currently
939 available, nonzero otherwise. */
942 have_partial_symbols (void)
948 if (objfile_has_partial_symbols (ofp
))
954 /* Many places in gdb want to test just to see if we have any full
955 symbols available. This function returns zero if none are currently
956 available, nonzero otherwise. */
959 have_full_symbols (void)
965 if (objfile_has_full_symbols (ofp
))
972 /* This operations deletes all objfile entries that represent solibs that
973 weren't explicitly loaded by the user, via e.g., the add-symbol-file
977 objfile_purge_solibs (void)
979 struct objfile
*objf
;
980 struct objfile
*temp
;
982 ALL_OBJFILES_SAFE (objf
, temp
)
984 /* We assume that the solib package has been purged already, or will
987 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
993 /* Many places in gdb want to test just to see if we have any minimal
994 symbols available. This function returns zero if none are currently
995 available, nonzero otherwise. */
998 have_minimal_symbols (void)
1000 struct objfile
*ofp
;
1004 if (ofp
->minimal_symbol_count
> 0)
1012 /* Qsort comparison function. */
1015 qsort_cmp (const void *a
, const void *b
)
1017 const struct obj_section
*sect1
= *(const struct obj_section
**) a
;
1018 const struct obj_section
*sect2
= *(const struct obj_section
**) b
;
1019 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1020 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1022 if (sect1_addr
< sect2_addr
)
1024 else if (sect1_addr
> sect2_addr
)
1028 /* Sections are at the same address. This could happen if
1029 A) we have an objfile and a separate debuginfo.
1030 B) we are confused, and have added sections without proper relocation,
1031 or something like that. */
1033 const struct objfile
*const objfile1
= sect1
->objfile
;
1034 const struct objfile
*const objfile2
= sect2
->objfile
;
1036 if (objfile1
->separate_debug_objfile
== objfile2
1037 || objfile2
->separate_debug_objfile
== objfile1
)
1039 /* Case A. The ordering doesn't matter: separate debuginfo files
1040 will be filtered out later. */
1045 /* Case B. Maintain stable sort order, so bugs in GDB are easier to
1046 triage. This section could be slow (since we iterate over all
1047 objfiles in each call to qsort_cmp), but this shouldn't happen
1048 very often (GDB is already in a confused state; one hopes this
1049 doesn't happen at all). If you discover that significant time is
1050 spent in the loops below, do 'set complaints 100' and examine the
1051 resulting complaints. */
1053 if (objfile1
== objfile2
)
1055 /* Both sections came from the same objfile. We are really confused.
1056 Sort on sequence order of sections within the objfile. */
1058 const struct obj_section
*osect
;
1060 ALL_OBJFILE_OSECTIONS (objfile1
, osect
)
1063 else if (osect
== sect2
)
1066 /* We should have found one of the sections before getting here. */
1067 gdb_assert_not_reached ("section not found");
1071 /* Sort on sequence number of the objfile in the chain. */
1073 const struct objfile
*objfile
;
1075 ALL_OBJFILES (objfile
)
1076 if (objfile
== objfile1
)
1078 else if (objfile
== objfile2
)
1081 /* We should have found one of the objfiles before getting here. */
1082 gdb_assert_not_reached ("objfile not found");
1087 gdb_assert_not_reached ("unexpected code path");
1091 /* Select "better" obj_section to keep. We prefer the one that came from
1092 the real object, rather than the one from separate debuginfo.
1093 Most of the time the two sections are exactly identical, but with
1094 prelinking the .rel.dyn section in the real object may have different
1097 static struct obj_section
*
1098 preferred_obj_section (struct obj_section
*a
, struct obj_section
*b
)
1100 gdb_assert (obj_section_addr (a
) == obj_section_addr (b
));
1101 gdb_assert ((a
->objfile
->separate_debug_objfile
== b
->objfile
)
1102 || (b
->objfile
->separate_debug_objfile
== a
->objfile
));
1103 gdb_assert ((a
->objfile
->separate_debug_objfile_backlink
== b
->objfile
)
1104 || (b
->objfile
->separate_debug_objfile_backlink
== a
->objfile
));
1106 if (a
->objfile
->separate_debug_objfile
!= NULL
)
1111 /* Return 1 if SECTION should be inserted into the section map.
1112 We want to insert only non-overlay and non-TLS section. */
1115 insert_section_p (const struct bfd
*abfd
,
1116 const struct bfd_section
*section
)
1118 const bfd_vma lma
= bfd_section_lma (abfd
, section
);
1120 if (lma
!= 0 && lma
!= bfd_section_vma (abfd
, section
)
1121 && (bfd_get_file_flags (abfd
) & BFD_IN_MEMORY
) == 0)
1122 /* This is an overlay section. IN_MEMORY check is needed to avoid
1123 discarding sections from the "system supplied DSO" (aka vdso)
1124 on some Linux systems (e.g. Fedora 11). */
1126 if ((bfd_get_section_flags (abfd
, section
) & SEC_THREAD_LOCAL
) != 0)
1127 /* This is a TLS section. */
1133 /* Filter out overlapping sections where one section came from the real
1134 objfile, and the other from a separate debuginfo file.
1135 Return the size of table after redundant sections have been eliminated. */
1138 filter_debuginfo_sections (struct obj_section
**map
, int map_size
)
1142 for (i
= 0, j
= 0; i
< map_size
- 1; i
++)
1144 struct obj_section
*const sect1
= map
[i
];
1145 struct obj_section
*const sect2
= map
[i
+ 1];
1146 const struct objfile
*const objfile1
= sect1
->objfile
;
1147 const struct objfile
*const objfile2
= sect2
->objfile
;
1148 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1149 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1151 if (sect1_addr
== sect2_addr
1152 && (objfile1
->separate_debug_objfile
== objfile2
1153 || objfile2
->separate_debug_objfile
== objfile1
))
1155 map
[j
++] = preferred_obj_section (sect1
, sect2
);
1164 gdb_assert (i
== map_size
- 1);
1168 /* The map should not have shrunk to less than half the original size. */
1169 gdb_assert (map_size
/ 2 <= j
);
1174 /* Filter out overlapping sections, issuing a warning if any are found.
1175 Overlapping sections could really be overlay sections which we didn't
1176 classify as such in insert_section_p, or we could be dealing with a
1180 filter_overlapping_sections (struct obj_section
**map
, int map_size
)
1184 for (i
= 0, j
= 0; i
< map_size
- 1; )
1189 for (k
= i
+ 1; k
< map_size
; k
++)
1191 struct obj_section
*const sect1
= map
[i
];
1192 struct obj_section
*const sect2
= map
[k
];
1193 const CORE_ADDR sect1_addr
= obj_section_addr (sect1
);
1194 const CORE_ADDR sect2_addr
= obj_section_addr (sect2
);
1195 const CORE_ADDR sect1_endaddr
= obj_section_endaddr (sect1
);
1197 gdb_assert (sect1_addr
<= sect2_addr
);
1199 if (sect1_endaddr
<= sect2_addr
)
1203 /* We have an overlap. Report it. */
1205 struct objfile
*const objf1
= sect1
->objfile
;
1206 struct objfile
*const objf2
= sect2
->objfile
;
1208 const struct bfd
*const abfd1
= objf1
->obfd
;
1209 const struct bfd
*const abfd2
= objf2
->obfd
;
1211 const struct bfd_section
*const bfds1
= sect1
->the_bfd_section
;
1212 const struct bfd_section
*const bfds2
= sect2
->the_bfd_section
;
1214 const CORE_ADDR sect2_endaddr
= obj_section_endaddr (sect2
);
1216 struct gdbarch
*const gdbarch
= get_objfile_arch (objf1
);
1218 complaint (&symfile_complaints
,
1219 _("unexpected overlap between:\n"
1220 " (A) section `%s' from `%s' [%s, %s)\n"
1221 " (B) section `%s' from `%s' [%s, %s).\n"
1222 "Will ignore section B"),
1223 bfd_section_name (abfd1
, bfds1
), objf1
->name
,
1224 paddress (gdbarch
, sect1_addr
),
1225 paddress (gdbarch
, sect1_endaddr
),
1226 bfd_section_name (abfd2
, bfds2
), objf2
->name
,
1227 paddress (gdbarch
, sect2_addr
),
1228 paddress (gdbarch
, sect2_endaddr
));
1236 gdb_assert (i
== map_size
- 1);
1244 /* Update PMAP, PMAP_SIZE with sections from all objfiles, excluding any
1245 TLS, overlay and overlapping sections. */
1248 update_section_map (struct program_space
*pspace
,
1249 struct obj_section
***pmap
, int *pmap_size
)
1251 int alloc_size
, map_size
, i
;
1252 struct obj_section
*s
, **map
;
1253 struct objfile
*objfile
;
1255 gdb_assert (get_objfile_pspace_data (pspace
)->objfiles_changed_p
!= 0);
1261 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1262 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1263 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1266 /* This happens on detach/attach (e.g. in gdb.base/attach.exp). */
1267 if (alloc_size
== 0)
1274 map
= xmalloc (alloc_size
* sizeof (*map
));
1277 ALL_PSPACE_OBJFILES (pspace
, objfile
)
1278 ALL_OBJFILE_OSECTIONS (objfile
, s
)
1279 if (insert_section_p (objfile
->obfd
, s
->the_bfd_section
))
1282 qsort (map
, alloc_size
, sizeof (*map
), qsort_cmp
);
1283 map_size
= filter_debuginfo_sections(map
, alloc_size
);
1284 map_size
= filter_overlapping_sections(map
, map_size
);
1286 if (map_size
< alloc_size
)
1287 /* Some sections were eliminated. Trim excess space. */
1288 map
= xrealloc (map
, map_size
* sizeof (*map
));
1290 gdb_assert (alloc_size
== map_size
);
1293 *pmap_size
= map_size
;
1296 /* Bsearch comparison function. */
1299 bsearch_cmp (const void *key
, const void *elt
)
1301 const CORE_ADDR pc
= *(CORE_ADDR
*) key
;
1302 const struct obj_section
*section
= *(const struct obj_section
**) elt
;
1304 if (pc
< obj_section_addr (section
))
1306 if (pc
< obj_section_endaddr (section
))
1311 /* Returns a section whose range includes PC or NULL if none found. */
1313 struct obj_section
*
1314 find_pc_section (CORE_ADDR pc
)
1316 struct objfile_pspace_info
*pspace_info
;
1317 struct obj_section
*s
, **sp
;
1319 /* Check for mapped overlay section first. */
1320 s
= find_pc_mapped_section (pc
);
1324 pspace_info
= get_objfile_pspace_data (current_program_space
);
1325 if (pspace_info
->objfiles_changed_p
!= 0)
1327 update_section_map (current_program_space
,
1328 &pspace_info
->sections
,
1329 &pspace_info
->num_sections
);
1331 /* Don't need updates to section map until objfiles are added,
1332 removed or relocated. */
1333 pspace_info
->objfiles_changed_p
= 0;
1336 /* The C standard (ISO/IEC 9899:TC2) requires the BASE argument to
1337 bsearch be non-NULL. */
1338 if (pspace_info
->sections
== NULL
)
1340 gdb_assert (pspace_info
->num_sections
== 0);
1344 sp
= (struct obj_section
**) bsearch (&pc
,
1345 pspace_info
->sections
,
1346 pspace_info
->num_sections
,
1347 sizeof (*pspace_info
->sections
),
1355 /* In SVR4, we recognize a trampoline by it's section name.
1356 That is, if the pc is in a section named ".plt" then we are in
1360 in_plt_section (CORE_ADDR pc
, char *name
)
1362 struct obj_section
*s
;
1365 s
= find_pc_section (pc
);
1368 && s
->the_bfd_section
->name
!= NULL
1369 && strcmp (s
->the_bfd_section
->name
, ".plt") == 0);
1374 /* Keep a registry of per-objfile data-pointers required by other GDB
1380 void (*save
) (struct objfile
*, void *);
1381 void (*free
) (struct objfile
*, void *);
1384 struct objfile_data_registration
1386 struct objfile_data
*data
;
1387 struct objfile_data_registration
*next
;
1390 struct objfile_data_registry
1392 struct objfile_data_registration
*registrations
;
1393 unsigned num_registrations
;
1396 static struct objfile_data_registry objfile_data_registry
= { NULL
, 0 };
1398 const struct objfile_data
*
1399 register_objfile_data_with_cleanup (void (*save
) (struct objfile
*, void *),
1400 void (*free
) (struct objfile
*, void *))
1402 struct objfile_data_registration
**curr
;
1404 /* Append new registration. */
1405 for (curr
= &objfile_data_registry
.registrations
;
1406 *curr
!= NULL
; curr
= &(*curr
)->next
);
1408 *curr
= XMALLOC (struct objfile_data_registration
);
1409 (*curr
)->next
= NULL
;
1410 (*curr
)->data
= XMALLOC (struct objfile_data
);
1411 (*curr
)->data
->index
= objfile_data_registry
.num_registrations
++;
1412 (*curr
)->data
->save
= save
;
1413 (*curr
)->data
->free
= free
;
1415 return (*curr
)->data
;
1418 const struct objfile_data
*
1419 register_objfile_data (void)
1421 return register_objfile_data_with_cleanup (NULL
, NULL
);
1425 objfile_alloc_data (struct objfile
*objfile
)
1427 gdb_assert (objfile
->data
== NULL
);
1428 objfile
->num_data
= objfile_data_registry
.num_registrations
;
1429 objfile
->data
= XCALLOC (objfile
->num_data
, void *);
1433 objfile_free_data (struct objfile
*objfile
)
1435 gdb_assert (objfile
->data
!= NULL
);
1436 clear_objfile_data (objfile
);
1437 xfree (objfile
->data
);
1438 objfile
->data
= NULL
;
1442 clear_objfile_data (struct objfile
*objfile
)
1444 struct objfile_data_registration
*registration
;
1447 gdb_assert (objfile
->data
!= NULL
);
1449 /* Process all the save handlers. */
1451 for (registration
= objfile_data_registry
.registrations
, i
= 0;
1452 i
< objfile
->num_data
;
1453 registration
= registration
->next
, i
++)
1454 if (objfile
->data
[i
] != NULL
&& registration
->data
->save
!= NULL
)
1455 registration
->data
->save (objfile
, objfile
->data
[i
]);
1457 /* Now process all the free handlers. */
1459 for (registration
= objfile_data_registry
.registrations
, i
= 0;
1460 i
< objfile
->num_data
;
1461 registration
= registration
->next
, i
++)
1462 if (objfile
->data
[i
] != NULL
&& registration
->data
->free
!= NULL
)
1463 registration
->data
->free (objfile
, objfile
->data
[i
]);
1465 memset (objfile
->data
, 0, objfile
->num_data
* sizeof (void *));
1469 set_objfile_data (struct objfile
*objfile
, const struct objfile_data
*data
,
1472 gdb_assert (data
->index
< objfile
->num_data
);
1473 objfile
->data
[data
->index
] = value
;
1477 objfile_data (struct objfile
*objfile
, const struct objfile_data
*data
)
1479 gdb_assert (data
->index
< objfile
->num_data
);
1480 return objfile
->data
[data
->index
];
1483 /* Set objfiles_changed_p so section map will be rebuilt next time it
1484 is used. Called by reread_symbols. */
1487 objfiles_changed (void)
1489 /* Rebuild section map next time we need it. */
1490 get_objfile_pspace_data (current_program_space
)->objfiles_changed_p
= 1;
1493 /* Close ABFD, and warn if that fails. */
1496 gdb_bfd_close_or_warn (struct bfd
*abfd
)
1499 char *name
= bfd_get_filename (abfd
);
1501 ret
= bfd_close (abfd
);
1504 warning (_("cannot close \"%s\": %s"),
1505 name
, bfd_errmsg (bfd_get_error ()));
1510 /* Add reference to ABFD. Returns ABFD. */
1512 gdb_bfd_ref (struct bfd
*abfd
)
1519 p_refcount
= bfd_usrdata (abfd
);
1521 if (p_refcount
!= NULL
)
1527 p_refcount
= xmalloc (sizeof (*p_refcount
));
1529 bfd_usrdata (abfd
) = p_refcount
;
1534 /* Unreference and possibly close ABFD. */
1536 gdb_bfd_unref (struct bfd
*abfd
)
1544 p_refcount
= bfd_usrdata (abfd
);
1546 /* Valid range for p_refcount: a pointer to int counter, which has a
1547 value of 1 (single owner) or 2 (shared). */
1548 gdb_assert (*p_refcount
== 1 || *p_refcount
== 2);
1551 if (*p_refcount
> 0)
1555 bfd_usrdata (abfd
) = NULL
; /* Paranoia. */
1557 name
= bfd_get_filename (abfd
);
1558 gdb_bfd_close_or_warn (abfd
);
1562 /* Provide a prototype to silence -Wmissing-prototypes. */
1563 extern initialize_file_ftype _initialize_objfiles
;
1566 _initialize_objfiles (void)
1568 objfiles_pspace_data
1569 = register_program_space_data_with_cleanup (objfiles_pspace_data_cleanup
);