1 /* GDB routines for manipulating objfiles.
3 Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 2001, 2002 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 2 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, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330,
23 Boston, MA 02111-1307, USA. */
25 /* This file contains support routines for creating, manipulating, and
26 destroying objfile structures. */
29 #include "bfd.h" /* Binary File Description */
33 #include "gdb-stabs.h"
37 #include <sys/types.h>
40 #include "gdb_obstack.h"
41 #include "gdb_string.h"
43 #include "breakpoint.h"
45 /* Prototypes for local functions */
47 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
51 static int open_existing_mapped_file (char *, long, int);
53 static int open_mapped_file (char *filename
, long mtime
, int flags
);
55 static PTR
map_to_file (int);
57 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
59 static void add_to_objfile_sections (bfd
*, sec_ptr
, PTR
);
61 /* Externally visible variables that are owned by this module.
62 See declarations in objfile.h for more info. */
64 struct objfile
*object_files
; /* Linked list of all objfiles */
65 struct objfile
*current_objfile
; /* For symbol file being read in */
66 struct objfile
*symfile_objfile
; /* Main symbol table loaded from */
67 struct objfile
*rt_common_objfile
; /* For runtime common symbols */
69 int mapped_symbol_files
; /* Try to use mapped symbol files */
71 /* Locate all mappable sections of a BFD file.
72 objfile_p_char is a char * to get it through
73 bfd_map_over_sections; we cast it back to its proper type. */
75 #ifndef TARGET_KEEP_SECTION
76 #define TARGET_KEEP_SECTION(ASECT) 0
79 /* Called via bfd_map_over_sections to build up the section table that
80 the objfile references. The objfile contains pointers to the start
81 of the table (objfile->sections) and to the first location after
82 the end of the table (objfile->sections_end). */
85 add_to_objfile_sections (bfd
*abfd
, sec_ptr asect
, PTR objfile_p_char
)
87 struct objfile
*objfile
= (struct objfile
*) objfile_p_char
;
88 struct obj_section section
;
91 aflag
= bfd_get_section_flags (abfd
, asect
);
93 if (!(aflag
& SEC_ALLOC
) && !(TARGET_KEEP_SECTION (asect
)))
96 if (0 == bfd_section_size (abfd
, asect
))
99 section
.objfile
= objfile
;
100 section
.the_bfd_section
= asect
;
101 section
.ovly_mapped
= 0;
102 section
.addr
= bfd_section_vma (abfd
, asect
);
103 section
.endaddr
= section
.addr
+ bfd_section_size (abfd
, asect
);
104 obstack_grow (&objfile
->psymbol_obstack
, (char *) §ion
, sizeof (section
));
105 objfile
->sections_end
= (struct obj_section
*) (((unsigned long) objfile
->sections_end
) + 1);
108 /* Builds a section table for OBJFILE.
109 Returns 0 if OK, 1 on error (in which case bfd_error contains the
112 Note that while we are building the table, which goes into the
113 psymbol obstack, we hijack the sections_end pointer to instead hold
114 a count of the number of sections. When bfd_map_over_sections
115 returns, this count is used to compute the pointer to the end of
116 the sections table, which then overwrites the count.
118 Also note that the OFFSET and OVLY_MAPPED in each table entry
119 are initialized to zero.
121 Also note that if anything else writes to the psymbol obstack while
122 we are building the table, we're pretty much hosed. */
125 build_objfile_section_table (struct objfile
*objfile
)
127 /* objfile->sections can be already set when reading a mapped symbol
128 file. I believe that we do need to rebuild the section table in
129 this case (we rebuild other things derived from the bfd), but we
130 can't free the old one (it's in the psymbol_obstack). So we just
131 waste some memory. */
133 objfile
->sections_end
= 0;
134 bfd_map_over_sections (objfile
->obfd
, add_to_objfile_sections
, (char *) objfile
);
135 objfile
->sections
= (struct obj_section
*)
136 obstack_finish (&objfile
->psymbol_obstack
);
137 objfile
->sections_end
= objfile
->sections
+ (unsigned long) objfile
->sections_end
;
141 /* Given a pointer to an initialized bfd (ABFD) and some flag bits
142 allocate a new objfile struct, fill it in as best we can, link it
143 into the list of all known objfiles, and return a pointer to the
146 The FLAGS word contains various bits (OBJF_*) that can be taken as
147 requests for specific operations, like trying to open a mapped
148 version of the objfile (OBJF_MAPPED). Other bits like
149 OBJF_SHARED are simply copied through to the new objfile flags
153 allocate_objfile (bfd
*abfd
, int flags
)
155 struct objfile
*objfile
= NULL
;
156 struct objfile
*last_one
= NULL
;
158 if (mapped_symbol_files
)
159 flags
|= OBJF_MAPPED
;
161 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
165 /* If we can support mapped symbol files, try to open/reopen the
166 mapped file that corresponds to the file from which we wish to
167 read symbols. If the objfile is to be mapped, we must malloc
168 the structure itself using the mmap version, and arrange that
169 all memory allocation for the objfile uses the mmap routines.
170 If we are reusing an existing mapped file, from which we get
171 our objfile pointer, we have to make sure that we update the
172 pointers to the alloc/free functions in the obstack, in case
173 these functions have moved within the current gdb. */
177 fd
= open_mapped_file (bfd_get_filename (abfd
), bfd_get_mtime (abfd
),
183 if ((md
= map_to_file (fd
)) == NULL
)
187 else if ((objfile
= (struct objfile
*) mmalloc_getkey (md
, 0)) != NULL
)
189 /* Update memory corruption handler function addresses. */
193 /* Update pointers to functions to *our* copies */
194 obstack_chunkfun (&objfile
->psymbol_cache
.cache
, xmmalloc
);
195 obstack_freefun (&objfile
->psymbol_cache
.cache
, xmfree
);
196 obstack_chunkfun (&objfile
->macro_cache
.cache
, xmmalloc
);
197 obstack_freefun (&objfile
->macro_cache
.cache
, xmfree
);
198 obstack_chunkfun (&objfile
->psymbol_obstack
, xmmalloc
);
199 obstack_freefun (&objfile
->psymbol_obstack
, xmfree
);
200 obstack_chunkfun (&objfile
->symbol_obstack
, xmmalloc
);
201 obstack_freefun (&objfile
->symbol_obstack
, xmfree
);
202 obstack_chunkfun (&objfile
->type_obstack
, xmmalloc
);
203 obstack_freefun (&objfile
->type_obstack
, xmfree
);
204 /* If already in objfile list, unlink it. */
205 unlink_objfile (objfile
);
206 /* Forget things specific to a particular gdb, may have changed. */
212 /* Set up to detect internal memory corruption. MUST be
213 done before the first malloc. See comments in
214 init_malloc() and mmcheck(). */
218 objfile
= (struct objfile
*)
219 xmmalloc (md
, sizeof (struct objfile
));
220 memset (objfile
, 0, sizeof (struct objfile
));
223 objfile
->flags
|= OBJF_MAPPED
;
224 mmalloc_setkey (objfile
->md
, 0, objfile
);
225 obstack_specify_allocation_with_arg (&objfile
->psymbol_cache
.cache
,
226 0, 0, xmmalloc
, xmfree
,
228 obstack_specify_allocation_with_arg (&objfile
->macro_cache
.cache
,
229 0, 0, xmmalloc
, xmfree
,
231 obstack_specify_allocation_with_arg (&objfile
->psymbol_obstack
,
232 0, 0, xmmalloc
, xmfree
,
234 obstack_specify_allocation_with_arg (&objfile
->symbol_obstack
,
235 0, 0, xmmalloc
, xmfree
,
237 obstack_specify_allocation_with_arg (&objfile
->type_obstack
,
238 0, 0, xmmalloc
, xmfree
,
243 if ((flags
& OBJF_MAPPED
) && (objfile
== NULL
))
245 warning ("symbol table for '%s' will not be mapped",
246 bfd_get_filename (abfd
));
247 flags
&= ~OBJF_MAPPED
;
250 #else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */
252 if (flags
& OBJF_MAPPED
)
254 warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
256 /* Turn off the global flag so we don't try to do mapped symbol tables
257 any more, which shuts up gdb unless the user specifically gives the
258 "mapped" keyword again. */
260 mapped_symbol_files
= 0;
261 flags
&= ~OBJF_MAPPED
;
264 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
266 /* If we don't support mapped symbol files, didn't ask for the file to be
267 mapped, or failed to open the mapped file for some reason, then revert
268 back to an unmapped objfile. */
272 objfile
= (struct objfile
*) xmalloc (sizeof (struct objfile
));
273 memset (objfile
, 0, sizeof (struct objfile
));
275 objfile
->psymbol_cache
= bcache_xmalloc ();
276 objfile
->macro_cache
= bcache_xmalloc ();
277 obstack_specify_allocation (&objfile
->psymbol_obstack
, 0, 0, xmalloc
,
279 obstack_specify_allocation (&objfile
->symbol_obstack
, 0, 0, xmalloc
,
281 obstack_specify_allocation (&objfile
->type_obstack
, 0, 0, xmalloc
,
283 flags
&= ~OBJF_MAPPED
;
286 /* Update the per-objfile information that comes from the bfd, ensuring
287 that any data that is reference is saved in the per-objfile data
290 objfile
->obfd
= abfd
;
291 if (objfile
->name
!= NULL
)
293 xmfree (objfile
->md
, objfile
->name
);
297 objfile
->name
= mstrsave (objfile
->md
, bfd_get_filename (abfd
));
298 objfile
->mtime
= bfd_get_mtime (abfd
);
300 /* Build section table. */
302 if (build_objfile_section_table (objfile
))
304 error ("Can't find the file sections in `%s': %s",
305 objfile
->name
, bfd_errmsg (bfd_get_error ()));
309 /* Initialize the section indexes for this objfile, so that we can
310 later detect if they are used w/o being properly assigned to. */
312 objfile
->sect_index_text
= -1;
313 objfile
->sect_index_data
= -1;
314 objfile
->sect_index_bss
= -1;
315 objfile
->sect_index_rodata
= -1;
317 /* Add this file onto the tail of the linked list of other such files. */
319 objfile
->next
= NULL
;
320 if (object_files
== NULL
)
321 object_files
= objfile
;
324 for (last_one
= object_files
;
326 last_one
= last_one
->next
);
327 last_one
->next
= objfile
;
330 /* Save passed in flag bits. */
331 objfile
->flags
|= flags
;
336 /* Put OBJFILE at the front of the list. */
339 objfile_to_front (struct objfile
*objfile
)
341 struct objfile
**objp
;
342 for (objp
= &object_files
; *objp
!= NULL
; objp
= &((*objp
)->next
))
344 if (*objp
== objfile
)
346 /* Unhook it from where it is. */
347 *objp
= objfile
->next
;
348 /* Put it in the front. */
349 objfile
->next
= object_files
;
350 object_files
= objfile
;
356 /* Unlink OBJFILE from the list of known objfiles, if it is found in the
359 It is not a bug, or error, to call this function if OBJFILE is not known
360 to be in the current list. This is done in the case of mapped objfiles,
361 for example, just to ensure that the mapped objfile doesn't appear twice
362 in the list. Since the list is threaded, linking in a mapped objfile
363 twice would create a circular list.
365 If OBJFILE turns out to be in the list, we zap it's NEXT pointer after
366 unlinking it, just to ensure that we have completely severed any linkages
367 between the OBJFILE and the list. */
370 unlink_objfile (struct objfile
*objfile
)
372 struct objfile
**objpp
;
374 for (objpp
= &object_files
; *objpp
!= NULL
; objpp
= &((*objpp
)->next
))
376 if (*objpp
== objfile
)
378 *objpp
= (*objpp
)->next
;
379 objfile
->next
= NULL
;
384 internal_error (__FILE__
, __LINE__
,
385 "unlink_objfile: objfile already unlinked");
389 /* Destroy an objfile and all the symtabs and psymtabs under it. Note
390 that as much as possible is allocated on the symbol_obstack and
391 psymbol_obstack, so that the memory can be efficiently freed.
393 Things which we do NOT free because they are not in malloc'd memory
394 or not in memory specific to the objfile include:
398 FIXME: If the objfile is using reusable symbol information (via mmalloc),
399 then we need to take into account the fact that more than one process
400 may be using the symbol information at the same time (when mmalloc is
401 extended to support cooperative locking). When more than one process
402 is using the mapped symbol info, we need to be more careful about when
403 we free objects in the reusable area. */
406 free_objfile (struct objfile
*objfile
)
408 /* First do any symbol file specific actions required when we are
409 finished with a particular symbol file. Note that if the objfile
410 is using reusable symbol information (via mmalloc) then each of
411 these routines is responsible for doing the correct thing, either
412 freeing things which are valid only during this particular gdb
413 execution, or leaving them to be reused during the next one. */
415 if (objfile
->sf
!= NULL
)
417 (*objfile
->sf
->sym_finish
) (objfile
);
420 /* We always close the bfd. */
422 if (objfile
->obfd
!= NULL
)
424 char *name
= bfd_get_filename (objfile
->obfd
);
425 if (!bfd_close (objfile
->obfd
))
426 warning ("cannot close \"%s\": %s",
427 name
, bfd_errmsg (bfd_get_error ()));
431 /* Remove it from the chain of all objfiles. */
433 unlink_objfile (objfile
);
435 /* If we are going to free the runtime common objfile, mark it
438 if (objfile
== rt_common_objfile
)
439 rt_common_objfile
= NULL
;
441 /* Before the symbol table code was redone to make it easier to
442 selectively load and remove information particular to a specific
443 linkage unit, gdb used to do these things whenever the monolithic
444 symbol table was blown away. How much still needs to be done
445 is unknown, but we play it safe for now and keep each action until
446 it is shown to be no longer needed. */
448 /* I *think* all our callers call clear_symtab_users. If so, no need
449 to call this here. */
450 clear_pc_function_cache ();
452 /* The last thing we do is free the objfile struct itself for the
453 non-reusable case, or detach from the mapped file for the
454 reusable case. Note that the mmalloc_detach or the xmfree() is
455 the last thing we can do with this objfile. */
457 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
459 if (objfile
->flags
& OBJF_MAPPED
)
461 /* Remember the fd so we can close it. We can't close it before
462 doing the detach, and after the detach the objfile is gone. */
465 mmfd
= objfile
->mmfd
;
466 mmalloc_detach (objfile
->md
);
471 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
473 /* If we still have an objfile, then either we don't support reusable
474 objfiles or this one was not reusable. So free it normally. */
478 if (objfile
->name
!= NULL
)
480 xmfree (objfile
->md
, objfile
->name
);
482 if (objfile
->global_psymbols
.list
)
483 xmfree (objfile
->md
, objfile
->global_psymbols
.list
);
484 if (objfile
->static_psymbols
.list
)
485 xmfree (objfile
->md
, objfile
->static_psymbols
.list
);
486 /* Free the obstacks for non-reusable objfiles */
487 bcache_xfree (objfile
->psymbol_cache
);
488 bcache_xfree (objfile
->macro_cache
);
489 obstack_free (&objfile
->psymbol_obstack
, 0);
490 obstack_free (&objfile
->symbol_obstack
, 0);
491 obstack_free (&objfile
->type_obstack
, 0);
492 xmfree (objfile
->md
, objfile
);
498 do_free_objfile_cleanup (void *obj
)
504 make_cleanup_free_objfile (struct objfile
*obj
)
506 return make_cleanup (do_free_objfile_cleanup
, obj
);
509 /* Free all the object files at once and clean up their users. */
512 free_all_objfiles (void)
514 struct objfile
*objfile
, *temp
;
516 ALL_OBJFILES_SAFE (objfile
, temp
)
518 free_objfile (objfile
);
520 clear_symtab_users ();
523 /* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
524 entries in new_offsets. */
526 objfile_relocate (struct objfile
*objfile
, struct section_offsets
*new_offsets
)
528 struct section_offsets
*delta
=
529 (struct section_offsets
*) alloca (SIZEOF_SECTION_OFFSETS
);
533 int something_changed
= 0;
534 for (i
= 0; i
< objfile
->num_sections
; ++i
)
537 ANOFFSET (new_offsets
, i
) - ANOFFSET (objfile
->section_offsets
, i
);
538 if (ANOFFSET (delta
, i
) != 0)
539 something_changed
= 1;
541 if (!something_changed
)
545 /* OK, get all the symtabs. */
549 ALL_OBJFILE_SYMTABS (objfile
, s
)
552 struct blockvector
*bv
;
555 /* First the line table. */
559 for (i
= 0; i
< l
->nitems
; ++i
)
560 l
->item
[i
].pc
+= ANOFFSET (delta
, s
->block_line_section
);
563 /* Don't relocate a shared blockvector more than once. */
567 bv
= BLOCKVECTOR (s
);
568 for (i
= 0; i
< BLOCKVECTOR_NBLOCKS (bv
); ++i
)
574 b
= BLOCKVECTOR_BLOCK (bv
, i
);
575 BLOCK_START (b
) += ANOFFSET (delta
, s
->block_line_section
);
576 BLOCK_END (b
) += ANOFFSET (delta
, s
->block_line_section
);
578 ALL_BLOCK_SYMBOLS (b
, j
, sym
)
580 fixup_symbol_section (sym
, objfile
);
582 /* The RS6000 code from which this was taken skipped
583 any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
584 But I'm leaving out that test, on the theory that
585 they can't possibly pass the tests below. */
586 if ((SYMBOL_CLASS (sym
) == LOC_LABEL
587 || SYMBOL_CLASS (sym
) == LOC_STATIC
588 || SYMBOL_CLASS (sym
) == LOC_INDIRECT
)
589 && SYMBOL_SECTION (sym
) >= 0)
591 SYMBOL_VALUE_ADDRESS (sym
) +=
592 ANOFFSET (delta
, SYMBOL_SECTION (sym
));
594 #ifdef MIPS_EFI_SYMBOL_NAME
595 /* Relocate Extra Function Info for ecoff. */
597 else if (SYMBOL_CLASS (sym
) == LOC_CONST
598 && SYMBOL_NAMESPACE (sym
) == LABEL_NAMESPACE
599 && strcmp (SYMBOL_NAME (sym
), MIPS_EFI_SYMBOL_NAME
) == 0)
600 ecoff_relocate_efi (sym
, ANOFFSET (delta
,
601 s
->block_line_section
));
609 struct partial_symtab
*p
;
611 ALL_OBJFILE_PSYMTABS (objfile
, p
)
613 p
->textlow
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
614 p
->texthigh
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
619 struct partial_symbol
**psym
;
621 for (psym
= objfile
->global_psymbols
.list
;
622 psym
< objfile
->global_psymbols
.next
;
625 fixup_psymbol_section (*psym
, objfile
);
626 if (SYMBOL_SECTION (*psym
) >= 0)
627 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
628 SYMBOL_SECTION (*psym
));
630 for (psym
= objfile
->static_psymbols
.list
;
631 psym
< objfile
->static_psymbols
.next
;
634 fixup_psymbol_section (*psym
, objfile
);
635 if (SYMBOL_SECTION (*psym
) >= 0)
636 SYMBOL_VALUE_ADDRESS (*psym
) += ANOFFSET (delta
,
637 SYMBOL_SECTION (*psym
));
642 struct minimal_symbol
*msym
;
643 ALL_OBJFILE_MSYMBOLS (objfile
, msym
)
644 if (SYMBOL_SECTION (msym
) >= 0)
645 SYMBOL_VALUE_ADDRESS (msym
) += ANOFFSET (delta
, SYMBOL_SECTION (msym
));
647 /* Relocating different sections by different amounts may cause the symbols
648 to be out of order. */
649 msymbols_sort (objfile
);
653 for (i
= 0; i
< objfile
->num_sections
; ++i
)
654 (objfile
->section_offsets
)->offsets
[i
] = ANOFFSET (new_offsets
, i
);
657 if (objfile
->ei
.entry_point
!= ~(CORE_ADDR
) 0)
659 /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT
660 only as a fallback. */
661 struct obj_section
*s
;
662 s
= find_pc_section (objfile
->ei
.entry_point
);
664 objfile
->ei
.entry_point
+= ANOFFSET (delta
, s
->the_bfd_section
->index
);
666 objfile
->ei
.entry_point
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
670 struct obj_section
*s
;
673 abfd
= objfile
->obfd
;
675 ALL_OBJFILE_OSECTIONS (objfile
, s
)
677 int idx
= s
->the_bfd_section
->index
;
679 s
->addr
+= ANOFFSET (delta
, idx
);
680 s
->endaddr
+= ANOFFSET (delta
, idx
);
684 if (objfile
->ei
.entry_func_lowpc
!= INVALID_ENTRY_LOWPC
)
686 objfile
->ei
.entry_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
687 objfile
->ei
.entry_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
690 if (objfile
->ei
.entry_file_lowpc
!= INVALID_ENTRY_LOWPC
)
692 objfile
->ei
.entry_file_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
693 objfile
->ei
.entry_file_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
696 if (objfile
->ei
.main_func_lowpc
!= INVALID_ENTRY_LOWPC
)
698 objfile
->ei
.main_func_lowpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
699 objfile
->ei
.main_func_highpc
+= ANOFFSET (delta
, SECT_OFF_TEXT (objfile
));
702 /* Relocate breakpoints as necessary, after things are relocated. */
703 breakpoint_re_set ();
706 /* Many places in gdb want to test just to see if we have any partial
707 symbols available. This function returns zero if none are currently
708 available, nonzero otherwise. */
711 have_partial_symbols (void)
717 if (ofp
->psymtabs
!= NULL
)
725 /* Many places in gdb want to test just to see if we have any full
726 symbols available. This function returns zero if none are currently
727 available, nonzero otherwise. */
730 have_full_symbols (void)
736 if (ofp
->symtabs
!= NULL
)
745 /* This operations deletes all objfile entries that represent solibs that
746 weren't explicitly loaded by the user, via e.g., the add-symbol-file
750 objfile_purge_solibs (void)
752 struct objfile
*objf
;
753 struct objfile
*temp
;
755 ALL_OBJFILES_SAFE (objf
, temp
)
757 /* We assume that the solib package has been purged already, or will
760 if (!(objf
->flags
& OBJF_USERLOADED
) && (objf
->flags
& OBJF_SHARED
))
766 /* Many places in gdb want to test just to see if we have any minimal
767 symbols available. This function returns zero if none are currently
768 available, nonzero otherwise. */
771 have_minimal_symbols (void)
777 if (ofp
->msymbols
!= NULL
)
785 #if defined(USE_MMALLOC) && defined(HAVE_MMAP)
787 /* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp
788 of the corresponding symbol file in MTIME, try to open an existing file
789 with the name SYMSFILENAME and verify it is more recent than the base
790 file by checking it's timestamp against MTIME.
792 If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1.
794 If SYMSFILENAME does exist, but is out of date, we check to see if the
795 user has specified creation of a mapped file. If so, we don't issue
796 any warning message because we will be creating a new mapped file anyway,
797 overwriting the old one. If not, then we issue a warning message so that
798 the user will know why we aren't using this existing mapped symbol file.
799 In either case, we return -1.
801 If SYMSFILENAME does exist and is not out of date, but can't be opened for
802 some reason, then prints an appropriate system error message and returns -1.
804 Otherwise, returns the open file descriptor. */
807 open_existing_mapped_file (char *symsfilename
, long mtime
, int flags
)
812 if (stat (symsfilename
, &sbuf
) == 0)
814 if (sbuf
.st_mtime
< mtime
)
816 if (!(flags
& OBJF_MAPPED
))
818 warning ("mapped symbol file `%s' is out of date, ignored it",
822 else if ((fd
= open (symsfilename
, O_RDWR
)) < 0)
826 printf_unfiltered (error_pre_print
);
828 print_sys_errmsg (symsfilename
, errno
);
834 /* Look for a mapped symbol file that corresponds to FILENAME and is more
835 recent than MTIME. If MAPPED is nonzero, the user has asked that gdb
836 use a mapped symbol file for this file, so create a new one if one does
839 If found, then return an open file descriptor for the file, otherwise
842 This routine is responsible for implementing the policy that generates
843 the name of the mapped symbol file from the name of a file containing
844 symbols that gdb would like to read. Currently this policy is to append
845 ".syms" to the name of the file.
847 This routine is also responsible for implementing the policy that
848 determines where the mapped symbol file is found (the search path).
849 This policy is that when reading an existing mapped file, a file of
850 the correct name in the current directory takes precedence over a
851 file of the correct name in the same directory as the symbol file.
852 When creating a new mapped file, it is always created in the current
853 directory. This helps to minimize the chances of a user unknowingly
854 creating big mapped files in places like /bin and /usr/local/bin, and
855 allows a local copy to override a manually installed global copy (in
856 /bin for example). */
859 open_mapped_file (char *filename
, long mtime
, int flags
)
864 /* First try to open an existing file in the current directory, and
865 then try the directory where the symbol file is located. */
867 symsfilename
= concat ("./", lbasename (filename
), ".syms", (char *) NULL
);
868 if ((fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
)) < 0)
870 xfree (symsfilename
);
871 symsfilename
= concat (filename
, ".syms", (char *) NULL
);
872 fd
= open_existing_mapped_file (symsfilename
, mtime
, flags
);
875 /* If we don't have an open file by now, then either the file does not
876 already exist, or the base file has changed since it was created. In
877 either case, if the user has specified use of a mapped file, then
878 create a new mapped file, truncating any existing one. If we can't
879 create one, print a system error message saying why we can't.
881 By default the file is rw for everyone, with the user's umask taking
882 care of turning off the permissions the user wants off. */
884 if ((fd
< 0) && (flags
& OBJF_MAPPED
))
886 xfree (symsfilename
);
887 symsfilename
= concat ("./", lbasename (filename
), ".syms",
889 if ((fd
= open (symsfilename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0666)) < 0)
893 printf_unfiltered (error_pre_print
);
895 print_sys_errmsg (symsfilename
, errno
);
899 xfree (symsfilename
);
909 md
= mmalloc_attach (fd
, (PTR
) 0);
912 mapto
= (CORE_ADDR
) mmalloc_getkey (md
, 1);
913 md
= mmalloc_detach (md
);
916 /* FIXME: should figure out why detach failed */
919 else if (mapto
!= (CORE_ADDR
) NULL
)
921 /* This mapping file needs to be remapped at "mapto" */
922 md
= mmalloc_attach (fd
, (PTR
) mapto
);
926 /* This is a freshly created mapping file. */
927 mapto
= (CORE_ADDR
) mmalloc_findbase (20 * 1024 * 1024);
930 /* To avoid reusing the freshly created mapping file, at the
931 address selected by mmap, we must truncate it before trying
932 to do an attach at the address we want. */
934 md
= mmalloc_attach (fd
, (PTR
) mapto
);
937 mmalloc_setkey (md
, 1, (PTR
) mapto
);
945 #endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */
947 /* Returns a section whose range includes PC and SECTION,
948 or NULL if none found. Note the distinction between the return type,
949 struct obj_section (which is defined in gdb), and the input type
950 struct sec (which is a bfd-defined data type). The obj_section
951 contains a pointer to the bfd struct sec section. */
954 find_pc_sect_section (CORE_ADDR pc
, struct sec
*section
)
956 struct obj_section
*s
;
957 struct objfile
*objfile
;
959 ALL_OBJSECTIONS (objfile
, s
)
960 if ((section
== 0 || section
== s
->the_bfd_section
) &&
961 s
->addr
<= pc
&& pc
< s
->endaddr
)
967 /* Returns a section whose range includes PC or NULL if none found.
968 Backward compatibility, no section. */
971 find_pc_section (CORE_ADDR pc
)
973 return find_pc_sect_section (pc
, find_pc_mapped_section (pc
));
977 /* In SVR4, we recognize a trampoline by it's section name.
978 That is, if the pc is in a section named ".plt" then we are in
982 in_plt_section (CORE_ADDR pc
, char *name
)
984 struct obj_section
*s
;
987 s
= find_pc_section (pc
);
990 && s
->the_bfd_section
->name
!= NULL
991 && STREQ (s
->the_bfd_section
->name
, ".plt"));
995 /* Return nonzero if NAME is in the import list of OBJFILE. Else
999 is_in_import_list (char *name
, struct objfile
*objfile
)
1003 if (!objfile
|| !name
|| !*name
)
1006 for (i
= 0; i
< objfile
->import_list_size
; i
++)
1007 if (objfile
->import_list
[i
] && STREQ (name
, objfile
->import_list
[i
]))
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