1 /* Generic symbol file reading for the GNU debugger, GDB.
3 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 1999, 2000, 2001, 2002, 2003, 2004, 2005 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. */
37 #include "breakpoint.h"
39 #include "complaints.h"
41 #include "inferior.h" /* for write_pc */
42 #include "filenames.h" /* for DOSish file names */
43 #include "gdb-stabs.h"
44 #include "gdb_obstack.h"
45 #include "completer.h"
48 #include "readline/readline.h"
49 #include "gdb_assert.h"
54 #include <sys/types.h>
56 #include "gdb_string.h"
66 int (*deprecated_ui_load_progress_hook) (const char *section, unsigned long num);
67 void (*deprecated_show_load_progress) (const char *section,
68 unsigned long section_sent,
69 unsigned long section_size,
70 unsigned long total_sent,
71 unsigned long total_size);
72 void (*deprecated_pre_add_symbol_hook) (const char *);
73 void (*deprecated_post_add_symbol_hook) (void);
74 void (*deprecated_target_new_objfile_hook) (struct objfile *);
76 static void clear_symtab_users_cleanup (void *ignore);
78 /* Global variables owned by this file */
79 int readnow_symbol_files; /* Read full symbols immediately */
81 /* External variables and functions referenced. */
83 extern void report_transfer_performance (unsigned long, time_t, time_t);
85 /* Functions this file defines */
88 static int simple_read_overlay_region_table (void);
89 static void simple_free_overlay_region_table (void);
92 static void set_initial_language (void);
94 static void load_command (char *, int);
96 static void symbol_file_add_main_1 (char *args, int from_tty, int flags);
98 static void add_symbol_file_command (char *, int);
100 static void add_shared_symbol_files_command (char *, int);
102 static void reread_separate_symbols (struct objfile *objfile);
104 static void cashier_psymtab (struct partial_symtab *);
106 bfd *symfile_bfd_open (char *);
108 int get_section_index (struct objfile *, char *);
110 static void find_sym_fns (struct objfile *);
112 static void decrement_reading_symtab (void *);
114 static void overlay_invalidate_all (void);
116 static int overlay_is_mapped (struct obj_section *);
118 void list_overlays_command (char *, int);
120 void map_overlay_command (char *, int);
122 void unmap_overlay_command (char *, int);
124 static void overlay_auto_command (char *, int);
126 static void overlay_manual_command (char *, int);
128 static void overlay_off_command (char *, int);
130 static void overlay_load_command (char *, int);
132 static void overlay_command (char *, int);
134 static void simple_free_overlay_table (void);
136 static void read_target_long_array (CORE_ADDR, unsigned int *, int);
138 static int simple_read_overlay_table (void);
140 static int simple_overlay_update_1 (struct obj_section *);
142 static void add_filename_language (char *ext, enum language lang);
144 static void info_ext_lang_command (char *args, int from_tty);
146 static char *find_separate_debug_file (struct objfile *objfile);
148 static void init_filename_language_table (void);
150 void _initialize_symfile (void);
152 /* List of all available sym_fns. On gdb startup, each object file reader
153 calls add_symtab_fns() to register information on each format it is
156 static struct sym_fns *symtab_fns = NULL;
158 /* Flag for whether user will be reloading symbols multiple times.
159 Defaults to ON for VxWorks, otherwise OFF. */
161 #ifdef SYMBOL_RELOADING_DEFAULT
162 int symbol_reloading = SYMBOL_RELOADING_DEFAULT;
164 int symbol_reloading = 0;
167 show_symbol_reloading (struct ui_file *file, int from_tty,
168 struct cmd_list_element *c, const char *value)
170 fprintf_filtered (file, _("\
171 Dynamic symbol table reloading multiple times in one run is %s.\n"),
176 /* If non-zero, shared library symbols will be added automatically
177 when the inferior is created, new libraries are loaded, or when
178 attaching to the inferior. This is almost always what users will
179 want to have happen; but for very large programs, the startup time
180 will be excessive, and so if this is a problem, the user can clear
181 this flag and then add the shared library symbols as needed. Note
182 that there is a potential for confusion, since if the shared
183 library symbols are not loaded, commands like "info fun" will *not*
184 report all the functions that are actually present. */
186 int auto_solib_add = 1;
188 /* For systems that support it, a threshold size in megabytes. If
189 automatically adding a new library's symbol table to those already
190 known to the debugger would cause the total shared library symbol
191 size to exceed this threshhold, then the shlib's symbols are not
192 added. The threshold is ignored if the user explicitly asks for a
193 shlib to be added, such as when using the "sharedlibrary"
196 int auto_solib_limit;
199 /* This compares two partial symbols by names, using strcmp_iw_ordered
200 for the comparison. */
203 compare_psymbols (const void *s1p, const void *s2p)
205 struct partial_symbol *const *s1 = s1p;
206 struct partial_symbol *const *s2 = s2p;
208 return strcmp_iw_ordered (SYMBOL_SEARCH_NAME (*s1),
209 SYMBOL_SEARCH_NAME (*s2));
213 sort_pst_symbols (struct partial_symtab *pst)
215 /* Sort the global list; don't sort the static list */
217 qsort (pst->objfile->global_psymbols.list + pst->globals_offset,
218 pst->n_global_syms, sizeof (struct partial_symbol *),
222 /* Make a null terminated copy of the string at PTR with SIZE characters in
223 the obstack pointed to by OBSTACKP . Returns the address of the copy.
224 Note that the string at PTR does not have to be null terminated, I.E. it
225 may be part of a larger string and we are only saving a substring. */
228 obsavestring (const char *ptr, int size, struct obstack *obstackp)
230 char *p = (char *) obstack_alloc (obstackp, size + 1);
231 /* Open-coded memcpy--saves function call time. These strings are usually
232 short. FIXME: Is this really still true with a compiler that can
235 const char *p1 = ptr;
237 const char *end = ptr + size;
245 /* Concatenate strings S1, S2 and S3; return the new string. Space is found
246 in the obstack pointed to by OBSTACKP. */
249 obconcat (struct obstack *obstackp, const char *s1, const char *s2,
252 int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
253 char *val = (char *) obstack_alloc (obstackp, len);
260 /* True if we are nested inside psymtab_to_symtab. */
262 int currently_reading_symtab = 0;
265 decrement_reading_symtab (void *dummy)
267 currently_reading_symtab--;
270 /* Get the symbol table that corresponds to a partial_symtab.
271 This is fast after the first time you do it. In fact, there
272 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
276 psymtab_to_symtab (struct partial_symtab *pst)
278 /* If it's been looked up before, return it. */
282 /* If it has not yet been read in, read it. */
285 struct cleanup *back_to = make_cleanup (decrement_reading_symtab, NULL);
286 currently_reading_symtab++;
287 (*pst->read_symtab) (pst);
288 do_cleanups (back_to);
294 /* Remember the lowest-addressed loadable section we've seen.
295 This function is called via bfd_map_over_sections.
297 In case of equal vmas, the section with the largest size becomes the
298 lowest-addressed loadable section.
300 If the vmas and sizes are equal, the last section is considered the
301 lowest-addressed loadable section. */
304 find_lowest_section (bfd *abfd, asection *sect, void *obj)
306 asection **lowest = (asection **) obj;
308 if (0 == (bfd_get_section_flags (abfd, sect) & SEC_LOAD))
311 *lowest = sect; /* First loadable section */
312 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
313 *lowest = sect; /* A lower loadable section */
314 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
315 && (bfd_section_size (abfd, (*lowest))
316 <= bfd_section_size (abfd, sect)))
320 /* Create a new section_addr_info, with room for NUM_SECTIONS. */
322 struct section_addr_info *
323 alloc_section_addr_info (size_t num_sections)
325 struct section_addr_info *sap;
328 size = (sizeof (struct section_addr_info)
329 + sizeof (struct other_sections) * (num_sections - 1));
330 sap = (struct section_addr_info *) xmalloc (size);
331 memset (sap, 0, size);
332 sap->num_sections = num_sections;
338 /* Return a freshly allocated copy of ADDRS. The section names, if
339 any, are also freshly allocated copies of those in ADDRS. */
340 struct section_addr_info *
341 copy_section_addr_info (struct section_addr_info *addrs)
343 struct section_addr_info *copy
344 = alloc_section_addr_info (addrs->num_sections);
347 copy->num_sections = addrs->num_sections;
348 for (i = 0; i < addrs->num_sections; i++)
350 copy->other[i].addr = addrs->other[i].addr;
351 if (addrs->other[i].name)
352 copy->other[i].name = xstrdup (addrs->other[i].name);
354 copy->other[i].name = NULL;
355 copy->other[i].sectindex = addrs->other[i].sectindex;
363 /* Build (allocate and populate) a section_addr_info struct from
364 an existing section table. */
366 extern struct section_addr_info *
367 build_section_addr_info_from_section_table (const struct section_table *start,
368 const struct section_table *end)
370 struct section_addr_info *sap;
371 const struct section_table *stp;
374 sap = alloc_section_addr_info (end - start);
376 for (stp = start, oidx = 0; stp != end; stp++)
378 if (bfd_get_section_flags (stp->bfd,
379 stp->the_bfd_section) & (SEC_ALLOC | SEC_LOAD)
380 && oidx < end - start)
382 sap->other[oidx].addr = stp->addr;
383 sap->other[oidx].name
384 = xstrdup (bfd_section_name (stp->bfd, stp->the_bfd_section));
385 sap->other[oidx].sectindex = stp->the_bfd_section->index;
394 /* Free all memory allocated by build_section_addr_info_from_section_table. */
397 free_section_addr_info (struct section_addr_info *sap)
401 for (idx = 0; idx < sap->num_sections; idx++)
402 if (sap->other[idx].name)
403 xfree (sap->other[idx].name);
408 /* Initialize OBJFILE's sect_index_* members. */
410 init_objfile_sect_indices (struct objfile *objfile)
415 sect = bfd_get_section_by_name (objfile->obfd, ".text");
417 objfile->sect_index_text = sect->index;
419 sect = bfd_get_section_by_name (objfile->obfd, ".data");
421 objfile->sect_index_data = sect->index;
423 sect = bfd_get_section_by_name (objfile->obfd, ".bss");
425 objfile->sect_index_bss = sect->index;
427 sect = bfd_get_section_by_name (objfile->obfd, ".rodata");
429 objfile->sect_index_rodata = sect->index;
431 /* This is where things get really weird... We MUST have valid
432 indices for the various sect_index_* members or gdb will abort.
433 So if for example, there is no ".text" section, we have to
434 accomodate that. Except when explicitly adding symbol files at
435 some address, section_offsets contains nothing but zeros, so it
436 doesn't matter which slot in section_offsets the individual
437 sect_index_* members index into. So if they are all zero, it is
438 safe to just point all the currently uninitialized indices to the
441 for (i = 0; i < objfile->num_sections; i++)
443 if (ANOFFSET (objfile->section_offsets, i) != 0)
448 if (i == objfile->num_sections)
450 if (objfile->sect_index_text == -1)
451 objfile->sect_index_text = 0;
452 if (objfile->sect_index_data == -1)
453 objfile->sect_index_data = 0;
454 if (objfile->sect_index_bss == -1)
455 objfile->sect_index_bss = 0;
456 if (objfile->sect_index_rodata == -1)
457 objfile->sect_index_rodata = 0;
461 /* The arguments to place_section. */
463 struct place_section_arg
465 struct section_offsets *offsets;
469 /* Find a unique offset to use for loadable section SECT if
470 the user did not provide an offset. */
473 place_section (bfd *abfd, asection *sect, void *obj)
475 struct place_section_arg *arg = obj;
476 CORE_ADDR *offsets = arg->offsets->offsets, start_addr;
479 /* We are only interested in loadable sections. */
480 if ((bfd_get_section_flags (abfd, sect) & SEC_LOAD) == 0)
483 /* If the user specified an offset, honor it. */
484 if (offsets[sect->index] != 0)
487 /* Otherwise, let's try to find a place for the section. */
490 ULONGEST align = 1 << bfd_get_section_alignment (abfd, sect);
492 start_addr = (arg->lowest + align - 1) & -align;
495 for (cur_sec = abfd->sections; cur_sec != NULL; cur_sec = cur_sec->next)
497 int indx = cur_sec->index;
498 CORE_ADDR cur_offset;
500 /* We don't need to compare against ourself. */
504 /* We can only conflict with loadable sections. */
505 if ((bfd_get_section_flags (abfd, cur_sec) & SEC_LOAD) == 0)
508 /* We do not expect this to happen; just ignore sections in a
509 relocatable file with an assigned VMA. */
510 if (bfd_section_vma (abfd, cur_sec) != 0)
513 /* If the section offset is 0, either the section has not been placed
514 yet, or it was the lowest section placed (in which case LOWEST
515 will be past its end). */
516 if (offsets[indx] == 0)
519 /* If this section would overlap us, then we must move up. */
520 if (start_addr + bfd_get_section_size (sect) > offsets[indx]
521 && start_addr < offsets[indx] + bfd_get_section_size (cur_sec))
523 start_addr = offsets[indx] + bfd_get_section_size (cur_sec);
524 start_addr = (start_addr + align - 1) & -align;
529 /* Otherwise, we appear to be OK. So far. */
534 offsets[sect->index] = start_addr;
535 arg->lowest = start_addr + bfd_get_section_size (sect);
537 exec_set_section_address (bfd_get_filename (abfd), sect->index, start_addr);
540 /* Parse the user's idea of an offset for dynamic linking, into our idea
541 of how to represent it for fast symbol reading. This is the default
542 version of the sym_fns.sym_offsets function for symbol readers that
543 don't need to do anything special. It allocates a section_offsets table
544 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
547 default_symfile_offsets (struct objfile *objfile,
548 struct section_addr_info *addrs)
552 objfile->num_sections = bfd_count_sections (objfile->obfd);
553 objfile->section_offsets = (struct section_offsets *)
554 obstack_alloc (&objfile->objfile_obstack,
555 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
556 memset (objfile->section_offsets, 0,
557 SIZEOF_N_SECTION_OFFSETS (objfile->num_sections));
559 /* Now calculate offsets for section that were specified by the
561 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
563 struct other_sections *osp ;
565 osp = &addrs->other[i] ;
569 /* Record all sections in offsets */
570 /* The section_offsets in the objfile are here filled in using
572 (objfile->section_offsets)->offsets[osp->sectindex] = osp->addr;
575 /* For relocatable files, all loadable sections will start at zero.
576 The zero is meaningless, so try to pick arbitrary addresses such
577 that no loadable sections overlap. This algorithm is quadratic,
578 but the number of sections in a single object file is generally
580 if ((bfd_get_file_flags (objfile->obfd) & (EXEC_P | DYNAMIC)) == 0)
582 struct place_section_arg arg;
583 arg.offsets = objfile->section_offsets;
585 bfd_map_over_sections (objfile->obfd, place_section, &arg);
588 /* Remember the bfd indexes for the .text, .data, .bss and
590 init_objfile_sect_indices (objfile);
594 /* Process a symbol file, as either the main file or as a dynamically
597 OBJFILE is where the symbols are to be read from.
599 ADDRS is the list of section load addresses. If the user has given
600 an 'add-symbol-file' command, then this is the list of offsets and
601 addresses he or she provided as arguments to the command; or, if
602 we're handling a shared library, these are the actual addresses the
603 sections are loaded at, according to the inferior's dynamic linker
604 (as gleaned by GDB's shared library code). We convert each address
605 into an offset from the section VMA's as it appears in the object
606 file, and then call the file's sym_offsets function to convert this
607 into a format-specific offset table --- a `struct section_offsets'.
608 If ADDRS is non-zero, OFFSETS must be zero.
610 OFFSETS is a table of section offsets already in the right
611 format-specific representation. NUM_OFFSETS is the number of
612 elements present in OFFSETS->offsets. If OFFSETS is non-zero, we
613 assume this is the proper table the call to sym_offsets described
614 above would produce. Instead of calling sym_offsets, we just dump
615 it right into objfile->section_offsets. (When we're re-reading
616 symbols from an objfile, we don't have the original load address
617 list any more; all we have is the section offset table.) If
618 OFFSETS is non-zero, ADDRS must be zero.
620 MAINLINE is nonzero if this is the main symbol file, or zero if
621 it's an extra symbol file such as dynamically loaded code.
623 VERBO is nonzero if the caller has printed a verbose message about
624 the symbol reading (and complaints can be more terse about it). */
627 syms_from_objfile (struct objfile *objfile,
628 struct section_addr_info *addrs,
629 struct section_offsets *offsets,
634 struct section_addr_info *local_addr = NULL;
635 struct cleanup *old_chain;
637 gdb_assert (! (addrs && offsets));
639 init_entry_point_info (objfile);
640 find_sym_fns (objfile);
642 if (objfile->sf == NULL)
643 return; /* No symbols. */
645 /* Make sure that partially constructed symbol tables will be cleaned up
646 if an error occurs during symbol reading. */
647 old_chain = make_cleanup_free_objfile (objfile);
649 /* If ADDRS and OFFSETS are both NULL, put together a dummy address
650 list. We now establish the convention that an addr of zero means
651 no load address was specified. */
652 if (! addrs && ! offsets)
655 = alloc_section_addr_info (bfd_count_sections (objfile->obfd));
656 make_cleanup (xfree, local_addr);
660 /* Now either addrs or offsets is non-zero. */
664 /* We will modify the main symbol table, make sure that all its users
665 will be cleaned up if an error occurs during symbol reading. */
666 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
668 /* Since no error yet, throw away the old symbol table. */
670 if (symfile_objfile != NULL)
672 free_objfile (symfile_objfile);
673 symfile_objfile = NULL;
676 /* Currently we keep symbols from the add-symbol-file command.
677 If the user wants to get rid of them, they should do "symbol-file"
678 without arguments first. Not sure this is the best behavior
681 (*objfile->sf->sym_new_init) (objfile);
684 /* Convert addr into an offset rather than an absolute address.
685 We find the lowest address of a loaded segment in the objfile,
686 and assume that <addr> is where that got loaded.
688 We no longer warn if the lowest section is not a text segment (as
689 happens for the PA64 port. */
690 if (!mainline && addrs && addrs->other[0].name)
692 asection *lower_sect;
694 CORE_ADDR lower_offset;
697 /* Find lowest loadable section to be used as starting point for
698 continguous sections. FIXME!! won't work without call to find
699 .text first, but this assumes text is lowest section. */
700 lower_sect = bfd_get_section_by_name (objfile->obfd, ".text");
701 if (lower_sect == NULL)
702 bfd_map_over_sections (objfile->obfd, find_lowest_section,
704 if (lower_sect == NULL)
705 warning (_("no loadable sections found in added symbol-file %s"),
708 if ((bfd_get_section_flags (objfile->obfd, lower_sect) & SEC_CODE) == 0)
709 warning (_("Lowest section in %s is %s at %s"),
711 bfd_section_name (objfile->obfd, lower_sect),
712 paddr (bfd_section_vma (objfile->obfd, lower_sect)));
713 if (lower_sect != NULL)
714 lower_offset = bfd_section_vma (objfile->obfd, lower_sect);
718 /* Calculate offsets for the loadable sections.
719 FIXME! Sections must be in order of increasing loadable section
720 so that contiguous sections can use the lower-offset!!!
722 Adjust offsets if the segments are not contiguous.
723 If the section is contiguous, its offset should be set to
724 the offset of the highest loadable section lower than it
725 (the loadable section directly below it in memory).
726 this_offset = lower_offset = lower_addr - lower_orig_addr */
728 for (i = 0; i < addrs->num_sections && addrs->other[i].name; i++)
730 if (addrs->other[i].addr != 0)
732 sect = bfd_get_section_by_name (objfile->obfd,
733 addrs->other[i].name);
737 -= bfd_section_vma (objfile->obfd, sect);
738 lower_offset = addrs->other[i].addr;
739 /* This is the index used by BFD. */
740 addrs->other[i].sectindex = sect->index ;
744 warning (_("section %s not found in %s"),
745 addrs->other[i].name,
747 addrs->other[i].addr = 0;
751 addrs->other[i].addr = lower_offset;
755 /* Initialize symbol reading routines for this objfile, allow complaints to
756 appear for this new file, and record how verbose to be, then do the
757 initial symbol reading for this file. */
759 (*objfile->sf->sym_init) (objfile);
760 clear_complaints (&symfile_complaints, 1, verbo);
763 (*objfile->sf->sym_offsets) (objfile, addrs);
766 size_t size = SIZEOF_N_SECTION_OFFSETS (num_offsets);
768 /* Just copy in the offset table directly as given to us. */
769 objfile->num_sections = num_offsets;
770 objfile->section_offsets
771 = ((struct section_offsets *)
772 obstack_alloc (&objfile->objfile_obstack, size));
773 memcpy (objfile->section_offsets, offsets, size);
775 init_objfile_sect_indices (objfile);
778 #ifndef DEPRECATED_IBM6000_TARGET
779 /* This is a SVR4/SunOS specific hack, I think. In any event, it
780 screws RS/6000. sym_offsets should be doing this sort of thing,
781 because it knows the mapping between bfd sections and
783 /* This is a hack. As far as I can tell, section offsets are not
784 target dependent. They are all set to addr with a couple of
785 exceptions. The exceptions are sysvr4 shared libraries, whose
786 offsets are kept in solib structures anyway and rs6000 xcoff
787 which handles shared libraries in a completely unique way.
789 Section offsets are built similarly, except that they are built
790 by adding addr in all cases because there is no clear mapping
791 from section_offsets into actual sections. Note that solib.c
792 has a different algorithm for finding section offsets.
794 These should probably all be collapsed into some target
795 independent form of shared library support. FIXME. */
799 struct obj_section *s;
801 /* Map section offsets in "addr" back to the object's
802 sections by comparing the section names with bfd's
803 section names. Then adjust the section address by
804 the offset. */ /* for gdb/13815 */
806 ALL_OBJFILE_OSECTIONS (objfile, s)
808 CORE_ADDR s_addr = 0;
812 !s_addr && i < addrs->num_sections && addrs->other[i].name;
814 if (strcmp (bfd_section_name (s->objfile->obfd,
816 addrs->other[i].name) == 0)
817 s_addr = addrs->other[i].addr; /* end added for gdb/13815 */
819 s->addr -= s->offset;
821 s->endaddr -= s->offset;
822 s->endaddr += s_addr;
826 #endif /* not DEPRECATED_IBM6000_TARGET */
828 (*objfile->sf->sym_read) (objfile, mainline);
830 /* Don't allow char * to have a typename (else would get caddr_t).
831 Ditto void *. FIXME: Check whether this is now done by all the
832 symbol readers themselves (many of them now do), and if so remove
835 TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0;
836 TYPE_NAME (lookup_pointer_type (builtin_type_void)) = 0;
838 /* Mark the objfile has having had initial symbol read attempted. Note
839 that this does not mean we found any symbols... */
841 objfile->flags |= OBJF_SYMS;
843 /* Discard cleanups as symbol reading was successful. */
845 discard_cleanups (old_chain);
848 /* Perform required actions after either reading in the initial
849 symbols for a new objfile, or mapping in the symbols from a reusable
853 new_symfile_objfile (struct objfile *objfile, int mainline, int verbo)
856 /* If this is the main symbol file we have to clean up all users of the
857 old main symbol file. Otherwise it is sufficient to fixup all the
858 breakpoints that may have been redefined by this symbol file. */
861 /* OK, make it the "real" symbol file. */
862 symfile_objfile = objfile;
864 clear_symtab_users ();
868 breakpoint_re_set ();
871 /* We're done reading the symbol file; finish off complaints. */
872 clear_complaints (&symfile_complaints, 0, verbo);
875 /* Process a symbol file, as either the main file or as a dynamically
878 ABFD is a BFD already open on the file, as from symfile_bfd_open.
879 This BFD will be closed on error, and is always consumed by this function.
881 FROM_TTY says how verbose to be.
883 MAINLINE specifies whether this is the main symbol file, or whether
884 it's an extra symbol file such as dynamically loaded code.
886 ADDRS, OFFSETS, and NUM_OFFSETS are as described for
887 syms_from_objfile, above. ADDRS is ignored when MAINLINE is
890 Upon success, returns a pointer to the objfile that was added.
891 Upon failure, jumps back to command level (never returns). */
892 static struct objfile *
893 symbol_file_add_with_addrs_or_offsets (bfd *abfd, int from_tty,
894 struct section_addr_info *addrs,
895 struct section_offsets *offsets,
897 int mainline, int flags)
899 struct objfile *objfile;
900 struct partial_symtab *psymtab;
902 struct section_addr_info *orig_addrs = NULL;
903 struct cleanup *my_cleanups;
904 const char *name = bfd_get_filename (abfd);
906 my_cleanups = make_cleanup_bfd_close (abfd);
908 /* Give user a chance to burp if we'd be
909 interactively wiping out any existing symbols. */
911 if ((have_full_symbols () || have_partial_symbols ())
914 && !query ("Load new symbol table from \"%s\"? ", name))
915 error (_("Not confirmed."));
917 objfile = allocate_objfile (abfd, flags);
918 discard_cleanups (my_cleanups);
922 orig_addrs = copy_section_addr_info (addrs);
923 make_cleanup_free_section_addr_info (orig_addrs);
926 /* We either created a new mapped symbol table, mapped an existing
927 symbol table file which has not had initial symbol reading
928 performed, or need to read an unmapped symbol table. */
929 if (from_tty || info_verbose)
931 if (deprecated_pre_add_symbol_hook)
932 deprecated_pre_add_symbol_hook (name);
935 printf_unfiltered (_("Reading symbols from %s..."), name);
937 gdb_flush (gdb_stdout);
940 syms_from_objfile (objfile, addrs, offsets, num_offsets,
943 /* We now have at least a partial symbol table. Check to see if the
944 user requested that all symbols be read on initial access via either
945 the gdb startup command line or on a per symbol file basis. Expand
946 all partial symbol tables for this objfile if so. */
948 if ((flags & OBJF_READNOW) || readnow_symbol_files)
950 if (from_tty || info_verbose)
952 printf_unfiltered (_("expanding to full symbols..."));
954 gdb_flush (gdb_stdout);
957 for (psymtab = objfile->psymtabs;
959 psymtab = psymtab->next)
961 psymtab_to_symtab (psymtab);
965 debugfile = find_separate_debug_file (objfile);
970 objfile->separate_debug_objfile
971 = symbol_file_add (debugfile, from_tty, orig_addrs, 0, flags);
975 objfile->separate_debug_objfile
976 = symbol_file_add (debugfile, from_tty, NULL, 0, flags);
978 objfile->separate_debug_objfile->separate_debug_objfile_backlink
981 /* Put the separate debug object before the normal one, this is so that
982 usage of the ALL_OBJFILES_SAFE macro will stay safe. */
983 put_objfile_before (objfile->separate_debug_objfile, objfile);
988 if (!have_partial_symbols () && !have_full_symbols ())
991 printf_filtered (_("(no debugging symbols found)"));
992 if (from_tty || info_verbose)
993 printf_filtered ("...");
995 printf_filtered ("\n");
999 if (from_tty || info_verbose)
1001 if (deprecated_post_add_symbol_hook)
1002 deprecated_post_add_symbol_hook ();
1005 printf_unfiltered (_("done.\n"));
1009 /* We print some messages regardless of whether 'from_tty ||
1010 info_verbose' is true, so make sure they go out at the right
1012 gdb_flush (gdb_stdout);
1014 do_cleanups (my_cleanups);
1016 if (objfile->sf == NULL)
1017 return objfile; /* No symbols. */
1019 new_symfile_objfile (objfile, mainline, from_tty);
1021 if (deprecated_target_new_objfile_hook)
1022 deprecated_target_new_objfile_hook (objfile);
1024 bfd_cache_close_all ();
1029 /* Process the symbol file ABFD, as either the main file or as a
1030 dynamically loaded file.
1032 See symbol_file_add_with_addrs_or_offsets's comments for
1035 symbol_file_add_from_bfd (bfd *abfd, int from_tty,
1036 struct section_addr_info *addrs,
1037 int mainline, int flags)
1039 return symbol_file_add_with_addrs_or_offsets (abfd,
1040 from_tty, addrs, 0, 0,
1045 /* Process a symbol file, as either the main file or as a dynamically
1046 loaded file. See symbol_file_add_with_addrs_or_offsets's comments
1049 symbol_file_add (char *name, int from_tty, struct section_addr_info *addrs,
1050 int mainline, int flags)
1052 return symbol_file_add_from_bfd (symfile_bfd_open (name), from_tty,
1053 addrs, mainline, flags);
1057 /* Call symbol_file_add() with default values and update whatever is
1058 affected by the loading of a new main().
1059 Used when the file is supplied in the gdb command line
1060 and by some targets with special loading requirements.
1061 The auxiliary function, symbol_file_add_main_1(), has the flags
1062 argument for the switches that can only be specified in the symbol_file
1066 symbol_file_add_main (char *args, int from_tty)
1068 symbol_file_add_main_1 (args, from_tty, 0);
1072 symbol_file_add_main_1 (char *args, int from_tty, int flags)
1074 symbol_file_add (args, from_tty, NULL, 1, flags);
1076 /* Getting new symbols may change our opinion about
1077 what is frameless. */
1078 reinit_frame_cache ();
1080 set_initial_language ();
1084 symbol_file_clear (int from_tty)
1086 if ((have_full_symbols () || have_partial_symbols ())
1088 && !query ("Discard symbol table from `%s'? ",
1089 symfile_objfile->name))
1090 error (_("Not confirmed."));
1091 free_all_objfiles ();
1093 /* solib descriptors may have handles to objfiles. Since their
1094 storage has just been released, we'd better wipe the solib
1095 descriptors as well.
1097 #if defined(SOLIB_RESTART)
1101 symfile_objfile = NULL;
1103 printf_unfiltered (_("No symbol file now.\n"));
1107 get_debug_link_info (struct objfile *objfile, unsigned long *crc32_out)
1110 bfd_size_type debuglink_size;
1111 unsigned long crc32;
1116 sect = bfd_get_section_by_name (objfile->obfd, ".gnu_debuglink");
1121 debuglink_size = bfd_section_size (objfile->obfd, sect);
1123 contents = xmalloc (debuglink_size);
1124 bfd_get_section_contents (objfile->obfd, sect, contents,
1125 (file_ptr)0, (bfd_size_type)debuglink_size);
1127 /* Crc value is stored after the filename, aligned up to 4 bytes. */
1128 crc_offset = strlen (contents) + 1;
1129 crc_offset = (crc_offset + 3) & ~3;
1131 crc32 = bfd_get_32 (objfile->obfd, (bfd_byte *) (contents + crc_offset));
1138 separate_debug_file_exists (const char *name, unsigned long crc)
1140 unsigned long file_crc = 0;
1142 char buffer[8*1024];
1145 fd = open (name, O_RDONLY | O_BINARY);
1149 while ((count = read (fd, buffer, sizeof (buffer))) > 0)
1150 file_crc = gnu_debuglink_crc32 (file_crc, buffer, count);
1154 return crc == file_crc;
1157 static char *debug_file_directory = NULL;
1159 show_debug_file_directory (struct ui_file *file, int from_tty,
1160 struct cmd_list_element *c, const char *value)
1162 fprintf_filtered (file, _("\
1163 The directory where separate debug symbols are searched for is \"%s\".\n"),
1167 #if ! defined (DEBUG_SUBDIRECTORY)
1168 #define DEBUG_SUBDIRECTORY ".debug"
1172 find_separate_debug_file (struct objfile *objfile)
1179 bfd_size_type debuglink_size;
1180 unsigned long crc32;
1183 basename = get_debug_link_info (objfile, &crc32);
1185 if (basename == NULL)
1188 dir = xstrdup (objfile->name);
1190 /* Strip off the final filename part, leaving the directory name,
1191 followed by a slash. Objfile names should always be absolute and
1192 tilde-expanded, so there should always be a slash in there
1194 for (i = strlen(dir) - 1; i >= 0; i--)
1196 if (IS_DIR_SEPARATOR (dir[i]))
1199 gdb_assert (i >= 0 && IS_DIR_SEPARATOR (dir[i]));
1202 debugfile = alloca (strlen (debug_file_directory) + 1
1204 + strlen (DEBUG_SUBDIRECTORY)
1209 /* First try in the same directory as the original file. */
1210 strcpy (debugfile, dir);
1211 strcat (debugfile, basename);
1213 if (separate_debug_file_exists (debugfile, crc32))
1217 return xstrdup (debugfile);
1220 /* Then try in the subdirectory named DEBUG_SUBDIRECTORY. */
1221 strcpy (debugfile, dir);
1222 strcat (debugfile, DEBUG_SUBDIRECTORY);
1223 strcat (debugfile, "/");
1224 strcat (debugfile, basename);
1226 if (separate_debug_file_exists (debugfile, crc32))
1230 return xstrdup (debugfile);
1233 /* Then try in the global debugfile directory. */
1234 strcpy (debugfile, debug_file_directory);
1235 strcat (debugfile, "/");
1236 strcat (debugfile, dir);
1237 strcat (debugfile, basename);
1239 if (separate_debug_file_exists (debugfile, crc32))
1243 return xstrdup (debugfile);
1252 /* This is the symbol-file command. Read the file, analyze its
1253 symbols, and add a struct symtab to a symtab list. The syntax of
1254 the command is rather bizarre--(1) buildargv implements various
1255 quoting conventions which are undocumented and have little or
1256 nothing in common with the way things are quoted (or not quoted)
1257 elsewhere in GDB, (2) options are used, which are not generally
1258 used in GDB (perhaps "set mapped on", "set readnow on" would be
1259 better), (3) the order of options matters, which is contrary to GNU
1260 conventions (because it is confusing and inconvenient). */
1263 symbol_file_command (char *args, int from_tty)
1267 struct cleanup *cleanups;
1268 int flags = OBJF_USERLOADED;
1274 symbol_file_clear (from_tty);
1278 if ((argv = buildargv (args)) == NULL)
1282 cleanups = make_cleanup_freeargv (argv);
1283 while (*argv != NULL)
1285 if (strcmp (*argv, "-readnow") == 0)
1286 flags |= OBJF_READNOW;
1287 else if (**argv == '-')
1288 error (_("unknown option `%s'"), *argv);
1293 symbol_file_add_main_1 (name, from_tty, flags);
1300 error (_("no symbol file name was specified"));
1302 do_cleanups (cleanups);
1306 /* Set the initial language.
1308 A better solution would be to record the language in the psymtab when reading
1309 partial symbols, and then use it (if known) to set the language. This would
1310 be a win for formats that encode the language in an easily discoverable place,
1311 such as DWARF. For stabs, we can jump through hoops looking for specially
1312 named symbols or try to intuit the language from the specific type of stabs
1313 we find, but we can't do that until later when we read in full symbols.
1317 set_initial_language (void)
1319 struct partial_symtab *pst;
1320 enum language lang = language_unknown;
1322 pst = find_main_psymtab ();
1325 if (pst->filename != NULL)
1327 lang = deduce_language_from_filename (pst->filename);
1329 if (lang == language_unknown)
1331 /* Make C the default language */
1334 set_language (lang);
1335 expected_language = current_language; /* Don't warn the user */
1339 /* Open file specified by NAME and hand it off to BFD for preliminary
1340 analysis. Result is a newly initialized bfd *, which includes a newly
1341 malloc'd` copy of NAME (tilde-expanded and made absolute).
1342 In case of trouble, error() is called. */
1345 symfile_bfd_open (char *name)
1349 char *absolute_name;
1353 name = tilde_expand (name); /* Returns 1st new malloc'd copy */
1355 /* Look down path for it, allocate 2nd new malloc'd copy. */
1356 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, name, O_RDONLY | O_BINARY,
1358 #if defined(__GO32__) || defined(_WIN32) || defined (__CYGWIN__)
1361 char *exename = alloca (strlen (name) + 5);
1362 strcat (strcpy (exename, name), ".exe");
1363 desc = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST, exename,
1364 O_RDONLY | O_BINARY, 0, &absolute_name);
1369 make_cleanup (xfree, name);
1370 perror_with_name (name);
1372 xfree (name); /* Free 1st new malloc'd copy */
1373 name = absolute_name; /* Keep 2nd malloc'd copy in bfd */
1374 /* It'll be freed in free_objfile(). */
1376 sym_bfd = bfd_fopen (name, gnutarget, FOPEN_RB, desc);
1380 make_cleanup (xfree, name);
1381 error (_("\"%s\": can't open to read symbols: %s."), name,
1382 bfd_errmsg (bfd_get_error ()));
1384 bfd_set_cacheable (sym_bfd, 1);
1386 if (!bfd_check_format (sym_bfd, bfd_object))
1388 /* FIXME: should be checking for errors from bfd_close (for one thing,
1389 on error it does not free all the storage associated with the
1391 bfd_close (sym_bfd); /* This also closes desc */
1392 make_cleanup (xfree, name);
1393 error (_("\"%s\": can't read symbols: %s."), name,
1394 bfd_errmsg (bfd_get_error ()));
1399 /* Return the section index for the given section name. Return -1 if
1400 the section was not found. */
1402 get_section_index (struct objfile *objfile, char *section_name)
1404 asection *sect = bfd_get_section_by_name (objfile->obfd, section_name);
1411 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
1412 startup by the _initialize routine in each object file format reader,
1413 to register information about each format the the reader is prepared
1417 add_symtab_fns (struct sym_fns *sf)
1419 sf->next = symtab_fns;
1424 /* Initialize to read symbols from the symbol file sym_bfd. It either
1425 returns or calls error(). The result is an initialized struct sym_fns
1426 in the objfile structure, that contains cached information about the
1430 find_sym_fns (struct objfile *objfile)
1433 enum bfd_flavour our_flavour = bfd_get_flavour (objfile->obfd);
1434 char *our_target = bfd_get_target (objfile->obfd);
1436 if (our_flavour == bfd_target_srec_flavour
1437 || our_flavour == bfd_target_ihex_flavour
1438 || our_flavour == bfd_target_tekhex_flavour)
1439 return; /* No symbols. */
1441 for (sf = symtab_fns; sf != NULL; sf = sf->next)
1443 if (our_flavour == sf->sym_flavour)
1449 error (_("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown."),
1450 bfd_get_target (objfile->obfd));
1453 /* This function runs the load command of our current target. */
1456 load_command (char *arg, int from_tty)
1459 arg = get_exec_file (1);
1460 target_load (arg, from_tty);
1462 /* After re-loading the executable, we don't really know which
1463 overlays are mapped any more. */
1464 overlay_cache_invalid = 1;
1467 /* This version of "load" should be usable for any target. Currently
1468 it is just used for remote targets, not inftarg.c or core files,
1469 on the theory that only in that case is it useful.
1471 Avoiding xmodem and the like seems like a win (a) because we don't have
1472 to worry about finding it, and (b) On VMS, fork() is very slow and so
1473 we don't want to run a subprocess. On the other hand, I'm not sure how
1474 performance compares. */
1476 static int download_write_size = 512;
1478 show_download_write_size (struct ui_file *file, int from_tty,
1479 struct cmd_list_element *c, const char *value)
1481 fprintf_filtered (file, _("\
1482 The write size used when downloading a program is %s.\n"),
1485 static int validate_download = 0;
1487 /* Callback service function for generic_load (bfd_map_over_sections). */
1490 add_section_size_callback (bfd *abfd, asection *asec, void *data)
1492 bfd_size_type *sum = data;
1494 *sum += bfd_get_section_size (asec);
1497 /* Opaque data for load_section_callback. */
1498 struct load_section_data {
1499 unsigned long load_offset;
1500 unsigned long write_count;
1501 unsigned long data_count;
1502 bfd_size_type total_size;
1505 /* Callback service function for generic_load (bfd_map_over_sections). */
1508 load_section_callback (bfd *abfd, asection *asec, void *data)
1510 struct load_section_data *args = data;
1512 if (bfd_get_section_flags (abfd, asec) & SEC_LOAD)
1514 bfd_size_type size = bfd_get_section_size (asec);
1518 struct cleanup *old_chain;
1519 CORE_ADDR lma = bfd_section_lma (abfd, asec) + args->load_offset;
1520 bfd_size_type block_size;
1522 const char *sect_name = bfd_get_section_name (abfd, asec);
1525 if (download_write_size > 0 && size > download_write_size)
1526 block_size = download_write_size;
1530 buffer = xmalloc (size);
1531 old_chain = make_cleanup (xfree, buffer);
1533 /* Is this really necessary? I guess it gives the user something
1534 to look at during a long download. */
1535 ui_out_message (uiout, 0, "Loading section %s, size 0x%s lma 0x%s\n",
1536 sect_name, paddr_nz (size), paddr_nz (lma));
1538 bfd_get_section_contents (abfd, asec, buffer, 0, size);
1544 bfd_size_type this_transfer = size - sent;
1546 if (this_transfer >= block_size)
1547 this_transfer = block_size;
1548 len = target_write_memory_partial (lma, buffer,
1549 this_transfer, &err);
1552 if (validate_download)
1554 /* Broken memories and broken monitors manifest
1555 themselves here when bring new computers to
1556 life. This doubles already slow downloads. */
1557 /* NOTE: cagney/1999-10-18: A more efficient
1558 implementation might add a verify_memory()
1559 method to the target vector and then use
1560 that. remote.c could implement that method
1561 using the ``qCRC'' packet. */
1562 char *check = xmalloc (len);
1563 struct cleanup *verify_cleanups =
1564 make_cleanup (xfree, check);
1566 if (target_read_memory (lma, check, len) != 0)
1567 error (_("Download verify read failed at 0x%s"),
1569 if (memcmp (buffer, check, len) != 0)
1570 error (_("Download verify compare failed at 0x%s"),
1572 do_cleanups (verify_cleanups);
1574 args->data_count += len;
1577 args->write_count += 1;
1580 || (deprecated_ui_load_progress_hook != NULL
1581 && deprecated_ui_load_progress_hook (sect_name, sent)))
1582 error (_("Canceled the download"));
1584 if (deprecated_show_load_progress != NULL)
1585 deprecated_show_load_progress (sect_name, sent, size,
1589 while (sent < size);
1592 error (_("Memory access error while loading section %s."), sect_name);
1594 do_cleanups (old_chain);
1600 generic_load (char *args, int from_tty)
1604 struct timeval start_time, end_time;
1606 struct cleanup *old_cleanups;
1608 struct load_section_data cbdata;
1611 cbdata.load_offset = 0; /* Offset to add to vma for each section. */
1612 cbdata.write_count = 0; /* Number of writes needed. */
1613 cbdata.data_count = 0; /* Number of bytes written to target memory. */
1614 cbdata.total_size = 0; /* Total size of all bfd sectors. */
1616 /* Parse the input argument - the user can specify a load offset as
1617 a second argument. */
1618 filename = xmalloc (strlen (args) + 1);
1619 old_cleanups = make_cleanup (xfree, filename);
1620 strcpy (filename, args);
1621 offptr = strchr (filename, ' ');
1626 cbdata.load_offset = strtoul (offptr, &endptr, 0);
1627 if (offptr == endptr)
1628 error (_("Invalid download offset:%s."), offptr);
1632 cbdata.load_offset = 0;
1634 /* Open the file for loading. */
1635 loadfile_bfd = bfd_openr (filename, gnutarget);
1636 if (loadfile_bfd == NULL)
1638 perror_with_name (filename);
1642 /* FIXME: should be checking for errors from bfd_close (for one thing,
1643 on error it does not free all the storage associated with the
1645 make_cleanup_bfd_close (loadfile_bfd);
1647 if (!bfd_check_format (loadfile_bfd, bfd_object))
1649 error (_("\"%s\" is not an object file: %s"), filename,
1650 bfd_errmsg (bfd_get_error ()));
1653 bfd_map_over_sections (loadfile_bfd, add_section_size_callback,
1654 (void *) &cbdata.total_size);
1656 gettimeofday (&start_time, NULL);
1658 bfd_map_over_sections (loadfile_bfd, load_section_callback, &cbdata);
1660 gettimeofday (&end_time, NULL);
1662 entry = bfd_get_start_address (loadfile_bfd);
1663 ui_out_text (uiout, "Start address ");
1664 ui_out_field_fmt (uiout, "address", "0x%s", paddr_nz (entry));
1665 ui_out_text (uiout, ", load size ");
1666 ui_out_field_fmt (uiout, "load-size", "%lu", cbdata.data_count);
1667 ui_out_text (uiout, "\n");
1668 /* We were doing this in remote-mips.c, I suspect it is right
1669 for other targets too. */
1672 /* FIXME: are we supposed to call symbol_file_add or not? According
1673 to a comment from remote-mips.c (where a call to symbol_file_add
1674 was commented out), making the call confuses GDB if more than one
1675 file is loaded in. Some targets do (e.g., remote-vx.c) but
1676 others don't (or didn't - perhaps they have all been deleted). */
1678 print_transfer_performance (gdb_stdout, cbdata.data_count,
1679 cbdata.write_count, &start_time, &end_time);
1681 do_cleanups (old_cleanups);
1684 /* Report how fast the transfer went. */
1686 /* DEPRECATED: cagney/1999-10-18: report_transfer_performance is being
1687 replaced by print_transfer_performance (with a very different
1688 function signature). */
1691 report_transfer_performance (unsigned long data_count, time_t start_time,
1694 struct timeval start, end;
1696 start.tv_sec = start_time;
1698 end.tv_sec = end_time;
1701 print_transfer_performance (gdb_stdout, data_count, 0, &start, &end);
1705 print_transfer_performance (struct ui_file *stream,
1706 unsigned long data_count,
1707 unsigned long write_count,
1708 const struct timeval *start_time,
1709 const struct timeval *end_time)
1711 unsigned long time_count;
1713 /* Compute the elapsed time in milliseconds, as a tradeoff between
1714 accuracy and overflow. */
1715 time_count = (end_time->tv_sec - start_time->tv_sec) * 1000;
1716 time_count += (end_time->tv_usec - start_time->tv_usec) / 1000;
1718 ui_out_text (uiout, "Transfer rate: ");
1721 ui_out_field_fmt (uiout, "transfer-rate", "%lu",
1722 1000 * (data_count * 8) / time_count);
1723 ui_out_text (uiout, " bits/sec");
1727 ui_out_field_fmt (uiout, "transferred-bits", "%lu", (data_count * 8));
1728 ui_out_text (uiout, " bits in <1 sec");
1730 if (write_count > 0)
1732 ui_out_text (uiout, ", ");
1733 ui_out_field_fmt (uiout, "write-rate", "%lu", data_count / write_count);
1734 ui_out_text (uiout, " bytes/write");
1736 ui_out_text (uiout, ".\n");
1739 /* This function allows the addition of incrementally linked object files.
1740 It does not modify any state in the target, only in the debugger. */
1741 /* Note: ezannoni 2000-04-13 This function/command used to have a
1742 special case syntax for the rombug target (Rombug is the boot
1743 monitor for Microware's OS-9 / OS-9000, see remote-os9k.c). In the
1744 rombug case, the user doesn't need to supply a text address,
1745 instead a call to target_link() (in target.c) would supply the
1746 value to use. We are now discontinuing this type of ad hoc syntax. */
1749 add_symbol_file_command (char *args, int from_tty)
1751 char *filename = NULL;
1752 int flags = OBJF_USERLOADED;
1754 int expecting_option = 0;
1755 int section_index = 0;
1759 int expecting_sec_name = 0;
1760 int expecting_sec_addr = 0;
1768 struct section_addr_info *section_addrs;
1769 struct sect_opt *sect_opts = NULL;
1770 size_t num_sect_opts = 0;
1771 struct cleanup *my_cleanups = make_cleanup (null_cleanup, NULL);
1774 sect_opts = (struct sect_opt *) xmalloc (num_sect_opts
1775 * sizeof (struct sect_opt));
1780 error (_("add-symbol-file takes a file name and an address"));
1782 /* Make a copy of the string that we can safely write into. */
1783 args = xstrdup (args);
1785 while (*args != '\000')
1787 /* Any leading spaces? */
1788 while (isspace (*args))
1791 /* Point arg to the beginning of the argument. */
1794 /* Move args pointer over the argument. */
1795 while ((*args != '\000') && !isspace (*args))
1798 /* If there are more arguments, terminate arg and
1800 if (*args != '\000')
1803 /* Now process the argument. */
1806 /* The first argument is the file name. */
1807 filename = tilde_expand (arg);
1808 make_cleanup (xfree, filename);
1813 /* The second argument is always the text address at which
1814 to load the program. */
1815 sect_opts[section_index].name = ".text";
1816 sect_opts[section_index].value = arg;
1817 if (++section_index > num_sect_opts)
1820 sect_opts = ((struct sect_opt *)
1821 xrealloc (sect_opts,
1823 * sizeof (struct sect_opt)));
1828 /* It's an option (starting with '-') or it's an argument
1833 if (strcmp (arg, "-readnow") == 0)
1834 flags |= OBJF_READNOW;
1835 else if (strcmp (arg, "-s") == 0)
1837 expecting_sec_name = 1;
1838 expecting_sec_addr = 1;
1843 if (expecting_sec_name)
1845 sect_opts[section_index].name = arg;
1846 expecting_sec_name = 0;
1849 if (expecting_sec_addr)
1851 sect_opts[section_index].value = arg;
1852 expecting_sec_addr = 0;
1853 if (++section_index > num_sect_opts)
1856 sect_opts = ((struct sect_opt *)
1857 xrealloc (sect_opts,
1859 * sizeof (struct sect_opt)));
1863 error (_("USAGE: add-symbol-file <filename> <textaddress> [-mapped] [-readnow] [-s <secname> <addr>]*"));
1869 /* Print the prompt for the query below. And save the arguments into
1870 a sect_addr_info structure to be passed around to other
1871 functions. We have to split this up into separate print
1872 statements because hex_string returns a local static
1875 printf_unfiltered (_("add symbol table from file \"%s\" at\n"), filename);
1876 section_addrs = alloc_section_addr_info (section_index);
1877 make_cleanup (xfree, section_addrs);
1878 for (i = 0; i < section_index; i++)
1881 char *val = sect_opts[i].value;
1882 char *sec = sect_opts[i].name;
1884 addr = parse_and_eval_address (val);
1886 /* Here we store the section offsets in the order they were
1887 entered on the command line. */
1888 section_addrs->other[sec_num].name = sec;
1889 section_addrs->other[sec_num].addr = addr;
1890 printf_unfiltered ("\t%s_addr = %s\n",
1891 sec, hex_string ((unsigned long)addr));
1894 /* The object's sections are initialized when a
1895 call is made to build_objfile_section_table (objfile).
1896 This happens in reread_symbols.
1897 At this point, we don't know what file type this is,
1898 so we can't determine what section names are valid. */
1901 if (from_tty && (!query ("%s", "")))
1902 error (_("Not confirmed."));
1904 symbol_file_add (filename, from_tty, section_addrs, 0, flags);
1906 /* Getting new symbols may change our opinion about what is
1908 reinit_frame_cache ();
1909 do_cleanups (my_cleanups);
1913 add_shared_symbol_files_command (char *args, int from_tty)
1915 #ifdef ADD_SHARED_SYMBOL_FILES
1916 ADD_SHARED_SYMBOL_FILES (args, from_tty);
1918 error (_("This command is not available in this configuration of GDB."));
1922 /* Re-read symbols if a symbol-file has changed. */
1924 reread_symbols (void)
1926 struct objfile *objfile;
1929 struct stat new_statbuf;
1932 /* With the addition of shared libraries, this should be modified,
1933 the load time should be saved in the partial symbol tables, since
1934 different tables may come from different source files. FIXME.
1935 This routine should then walk down each partial symbol table
1936 and see if the symbol table that it originates from has been changed */
1938 for (objfile = object_files; objfile; objfile = objfile->next)
1942 #ifdef DEPRECATED_IBM6000_TARGET
1943 /* If this object is from a shared library, then you should
1944 stat on the library name, not member name. */
1946 if (objfile->obfd->my_archive)
1947 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
1950 res = stat (objfile->name, &new_statbuf);
1953 /* FIXME, should use print_sys_errmsg but it's not filtered. */
1954 printf_unfiltered (_("`%s' has disappeared; keeping its symbols.\n"),
1958 new_modtime = new_statbuf.st_mtime;
1959 if (new_modtime != objfile->mtime)
1961 struct cleanup *old_cleanups;
1962 struct section_offsets *offsets;
1964 char *obfd_filename;
1966 printf_unfiltered (_("`%s' has changed; re-reading symbols.\n"),
1969 /* There are various functions like symbol_file_add,
1970 symfile_bfd_open, syms_from_objfile, etc., which might
1971 appear to do what we want. But they have various other
1972 effects which we *don't* want. So we just do stuff
1973 ourselves. We don't worry about mapped files (for one thing,
1974 any mapped file will be out of date). */
1976 /* If we get an error, blow away this objfile (not sure if
1977 that is the correct response for things like shared
1979 old_cleanups = make_cleanup_free_objfile (objfile);
1980 /* We need to do this whenever any symbols go away. */
1981 make_cleanup (clear_symtab_users_cleanup, 0 /*ignore*/);
1983 /* Clean up any state BFD has sitting around. We don't need
1984 to close the descriptor but BFD lacks a way of closing the
1985 BFD without closing the descriptor. */
1986 obfd_filename = bfd_get_filename (objfile->obfd);
1987 if (!bfd_close (objfile->obfd))
1988 error (_("Can't close BFD for %s: %s"), objfile->name,
1989 bfd_errmsg (bfd_get_error ()));
1990 objfile->obfd = bfd_openr (obfd_filename, gnutarget);
1991 if (objfile->obfd == NULL)
1992 error (_("Can't open %s to read symbols."), objfile->name);
1993 /* bfd_openr sets cacheable to true, which is what we want. */
1994 if (!bfd_check_format (objfile->obfd, bfd_object))
1995 error (_("Can't read symbols from %s: %s."), objfile->name,
1996 bfd_errmsg (bfd_get_error ()));
1998 /* Save the offsets, we will nuke them with the rest of the
2000 num_offsets = objfile->num_sections;
2001 offsets = ((struct section_offsets *)
2002 alloca (SIZEOF_N_SECTION_OFFSETS (num_offsets)));
2003 memcpy (offsets, objfile->section_offsets,
2004 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2006 /* Nuke all the state that we will re-read. Much of the following
2007 code which sets things to NULL really is necessary to tell
2008 other parts of GDB that there is nothing currently there. */
2010 /* FIXME: Do we have to free a whole linked list, or is this
2012 if (objfile->global_psymbols.list)
2013 xfree (objfile->global_psymbols.list);
2014 memset (&objfile->global_psymbols, 0,
2015 sizeof (objfile->global_psymbols));
2016 if (objfile->static_psymbols.list)
2017 xfree (objfile->static_psymbols.list);
2018 memset (&objfile->static_psymbols, 0,
2019 sizeof (objfile->static_psymbols));
2021 /* Free the obstacks for non-reusable objfiles */
2022 bcache_xfree (objfile->psymbol_cache);
2023 objfile->psymbol_cache = bcache_xmalloc ();
2024 bcache_xfree (objfile->macro_cache);
2025 objfile->macro_cache = bcache_xmalloc ();
2026 if (objfile->demangled_names_hash != NULL)
2028 htab_delete (objfile->demangled_names_hash);
2029 objfile->demangled_names_hash = NULL;
2031 obstack_free (&objfile->objfile_obstack, 0);
2032 objfile->sections = NULL;
2033 objfile->symtabs = NULL;
2034 objfile->psymtabs = NULL;
2035 objfile->free_psymtabs = NULL;
2036 objfile->cp_namespace_symtab = NULL;
2037 objfile->msymbols = NULL;
2038 objfile->deprecated_sym_private = NULL;
2039 objfile->minimal_symbol_count = 0;
2040 memset (&objfile->msymbol_hash, 0,
2041 sizeof (objfile->msymbol_hash));
2042 memset (&objfile->msymbol_demangled_hash, 0,
2043 sizeof (objfile->msymbol_demangled_hash));
2044 objfile->fundamental_types = NULL;
2045 clear_objfile_data (objfile);
2046 if (objfile->sf != NULL)
2048 (*objfile->sf->sym_finish) (objfile);
2051 /* We never make this a mapped file. */
2053 objfile->psymbol_cache = bcache_xmalloc ();
2054 objfile->macro_cache = bcache_xmalloc ();
2055 /* obstack_init also initializes the obstack so it is
2056 empty. We could use obstack_specify_allocation but
2057 gdb_obstack.h specifies the alloc/dealloc
2059 obstack_init (&objfile->objfile_obstack);
2060 if (build_objfile_section_table (objfile))
2062 error (_("Can't find the file sections in `%s': %s"),
2063 objfile->name, bfd_errmsg (bfd_get_error ()));
2065 terminate_minimal_symbol_table (objfile);
2067 /* We use the same section offsets as from last time. I'm not
2068 sure whether that is always correct for shared libraries. */
2069 objfile->section_offsets = (struct section_offsets *)
2070 obstack_alloc (&objfile->objfile_obstack,
2071 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2072 memcpy (objfile->section_offsets, offsets,
2073 SIZEOF_N_SECTION_OFFSETS (num_offsets));
2074 objfile->num_sections = num_offsets;
2076 /* What the hell is sym_new_init for, anyway? The concept of
2077 distinguishing between the main file and additional files
2078 in this way seems rather dubious. */
2079 if (objfile == symfile_objfile)
2081 (*objfile->sf->sym_new_init) (objfile);
2084 (*objfile->sf->sym_init) (objfile);
2085 clear_complaints (&symfile_complaints, 1, 1);
2086 /* The "mainline" parameter is a hideous hack; I think leaving it
2087 zero is OK since dbxread.c also does what it needs to do if
2088 objfile->global_psymbols.size is 0. */
2089 (*objfile->sf->sym_read) (objfile, 0);
2090 if (!have_partial_symbols () && !have_full_symbols ())
2093 printf_unfiltered (_("(no debugging symbols found)\n"));
2096 objfile->flags |= OBJF_SYMS;
2098 /* We're done reading the symbol file; finish off complaints. */
2099 clear_complaints (&symfile_complaints, 0, 1);
2101 /* Getting new symbols may change our opinion about what is
2104 reinit_frame_cache ();
2106 /* Discard cleanups as symbol reading was successful. */
2107 discard_cleanups (old_cleanups);
2109 /* If the mtime has changed between the time we set new_modtime
2110 and now, we *want* this to be out of date, so don't call stat
2112 objfile->mtime = new_modtime;
2114 reread_separate_symbols (objfile);
2121 clear_symtab_users ();
2122 /* At least one objfile has changed, so we can consider that
2123 the executable we're debugging has changed too. */
2124 observer_notify_executable_changed (NULL);
2130 /* Handle separate debug info for OBJFILE, which has just been
2132 - If we had separate debug info before, but now we don't, get rid
2133 of the separated objfile.
2134 - If we didn't have separated debug info before, but now we do,
2135 read in the new separated debug info file.
2136 - If the debug link points to a different file, toss the old one
2137 and read the new one.
2138 This function does *not* handle the case where objfile is still
2139 using the same separate debug info file, but that file's timestamp
2140 has changed. That case should be handled by the loop in
2141 reread_symbols already. */
2143 reread_separate_symbols (struct objfile *objfile)
2146 unsigned long crc32;
2148 /* Does the updated objfile's debug info live in a
2150 debug_file = find_separate_debug_file (objfile);
2152 if (objfile->separate_debug_objfile)
2154 /* There are two cases where we need to get rid of
2155 the old separated debug info objfile:
2156 - if the new primary objfile doesn't have
2157 separated debug info, or
2158 - if the new primary objfile has separate debug
2159 info, but it's under a different filename.
2161 If the old and new objfiles both have separate
2162 debug info, under the same filename, then we're
2163 okay --- if the separated file's contents have
2164 changed, we will have caught that when we
2165 visited it in this function's outermost
2168 || strcmp (debug_file, objfile->separate_debug_objfile->name) != 0)
2169 free_objfile (objfile->separate_debug_objfile);
2172 /* If the new objfile has separate debug info, and we
2173 haven't loaded it already, do so now. */
2175 && ! objfile->separate_debug_objfile)
2177 /* Use the same section offset table as objfile itself.
2178 Preserve the flags from objfile that make sense. */
2179 objfile->separate_debug_objfile
2180 = (symbol_file_add_with_addrs_or_offsets
2181 (symfile_bfd_open (debug_file),
2182 info_verbose, /* from_tty: Don't override the default. */
2183 0, /* No addr table. */
2184 objfile->section_offsets, objfile->num_sections,
2185 0, /* Not mainline. See comments about this above. */
2186 objfile->flags & (OBJF_REORDERED | OBJF_SHARED | OBJF_READNOW
2187 | OBJF_USERLOADED)));
2188 objfile->separate_debug_objfile->separate_debug_objfile_backlink
2204 static filename_language *filename_language_table;
2205 static int fl_table_size, fl_table_next;
2208 add_filename_language (char *ext, enum language lang)
2210 if (fl_table_next >= fl_table_size)
2212 fl_table_size += 10;
2213 filename_language_table =
2214 xrealloc (filename_language_table,
2215 fl_table_size * sizeof (*filename_language_table));
2218 filename_language_table[fl_table_next].ext = xstrdup (ext);
2219 filename_language_table[fl_table_next].lang = lang;
2223 static char *ext_args;
2225 show_ext_args (struct ui_file *file, int from_tty,
2226 struct cmd_list_element *c, const char *value)
2228 fprintf_filtered (file, _("\
2229 Mapping between filename extension and source language is \"%s\".\n"),
2234 set_ext_lang_command (char *args, int from_tty, struct cmd_list_element *e)
2237 char *cp = ext_args;
2240 /* First arg is filename extension, starting with '.' */
2242 error (_("'%s': Filename extension must begin with '.'"), ext_args);
2244 /* Find end of first arg. */
2245 while (*cp && !isspace (*cp))
2249 error (_("'%s': two arguments required -- filename extension and language"),
2252 /* Null-terminate first arg */
2255 /* Find beginning of second arg, which should be a source language. */
2256 while (*cp && isspace (*cp))
2260 error (_("'%s': two arguments required -- filename extension and language"),
2263 /* Lookup the language from among those we know. */
2264 lang = language_enum (cp);
2266 /* Now lookup the filename extension: do we already know it? */
2267 for (i = 0; i < fl_table_next; i++)
2268 if (0 == strcmp (ext_args, filename_language_table[i].ext))
2271 if (i >= fl_table_next)
2273 /* new file extension */
2274 add_filename_language (ext_args, lang);
2278 /* redefining a previously known filename extension */
2281 /* query ("Really make files of type %s '%s'?", */
2282 /* ext_args, language_str (lang)); */
2284 xfree (filename_language_table[i].ext);
2285 filename_language_table[i].ext = xstrdup (ext_args);
2286 filename_language_table[i].lang = lang;
2291 info_ext_lang_command (char *args, int from_tty)
2295 printf_filtered (_("Filename extensions and the languages they represent:"));
2296 printf_filtered ("\n\n");
2297 for (i = 0; i < fl_table_next; i++)
2298 printf_filtered ("\t%s\t- %s\n",
2299 filename_language_table[i].ext,
2300 language_str (filename_language_table[i].lang));
2304 init_filename_language_table (void)
2306 if (fl_table_size == 0) /* protect against repetition */
2310 filename_language_table =
2311 xmalloc (fl_table_size * sizeof (*filename_language_table));
2312 add_filename_language (".c", language_c);
2313 add_filename_language (".C", language_cplus);
2314 add_filename_language (".cc", language_cplus);
2315 add_filename_language (".cp", language_cplus);
2316 add_filename_language (".cpp", language_cplus);
2317 add_filename_language (".cxx", language_cplus);
2318 add_filename_language (".c++", language_cplus);
2319 add_filename_language (".java", language_java);
2320 add_filename_language (".class", language_java);
2321 add_filename_language (".m", language_objc);
2322 add_filename_language (".f", language_fortran);
2323 add_filename_language (".F", language_fortran);
2324 add_filename_language (".s", language_asm);
2325 add_filename_language (".S", language_asm);
2326 add_filename_language (".pas", language_pascal);
2327 add_filename_language (".p", language_pascal);
2328 add_filename_language (".pp", language_pascal);
2329 add_filename_language (".adb", language_ada);
2330 add_filename_language (".ads", language_ada);
2331 add_filename_language (".a", language_ada);
2332 add_filename_language (".ada", language_ada);
2337 deduce_language_from_filename (char *filename)
2342 if (filename != NULL)
2343 if ((cp = strrchr (filename, '.')) != NULL)
2344 for (i = 0; i < fl_table_next; i++)
2345 if (strcmp (cp, filename_language_table[i].ext) == 0)
2346 return filename_language_table[i].lang;
2348 return language_unknown;
2353 Allocate and partly initialize a new symbol table. Return a pointer
2354 to it. error() if no space.
2356 Caller must set these fields:
2362 possibly free_named_symtabs (symtab->filename);
2366 allocate_symtab (char *filename, struct objfile *objfile)
2368 struct symtab *symtab;
2370 symtab = (struct symtab *)
2371 obstack_alloc (&objfile->objfile_obstack, sizeof (struct symtab));
2372 memset (symtab, 0, sizeof (*symtab));
2373 symtab->filename = obsavestring (filename, strlen (filename),
2374 &objfile->objfile_obstack);
2375 symtab->fullname = NULL;
2376 symtab->language = deduce_language_from_filename (filename);
2377 symtab->debugformat = obsavestring ("unknown", 7,
2378 &objfile->objfile_obstack);
2380 /* Hook it to the objfile it comes from */
2382 symtab->objfile = objfile;
2383 symtab->next = objfile->symtabs;
2384 objfile->symtabs = symtab;
2386 /* FIXME: This should go away. It is only defined for the Z8000,
2387 and the Z8000 definition of this macro doesn't have anything to
2388 do with the now-nonexistent EXTRA_SYMTAB_INFO macro, it's just
2389 here for convenience. */
2390 #ifdef INIT_EXTRA_SYMTAB_INFO
2391 INIT_EXTRA_SYMTAB_INFO (symtab);
2397 struct partial_symtab *
2398 allocate_psymtab (char *filename, struct objfile *objfile)
2400 struct partial_symtab *psymtab;
2402 if (objfile->free_psymtabs)
2404 psymtab = objfile->free_psymtabs;
2405 objfile->free_psymtabs = psymtab->next;
2408 psymtab = (struct partial_symtab *)
2409 obstack_alloc (&objfile->objfile_obstack,
2410 sizeof (struct partial_symtab));
2412 memset (psymtab, 0, sizeof (struct partial_symtab));
2413 psymtab->filename = obsavestring (filename, strlen (filename),
2414 &objfile->objfile_obstack);
2415 psymtab->symtab = NULL;
2417 /* Prepend it to the psymtab list for the objfile it belongs to.
2418 Psymtabs are searched in most recent inserted -> least recent
2421 psymtab->objfile = objfile;
2422 psymtab->next = objfile->psymtabs;
2423 objfile->psymtabs = psymtab;
2426 struct partial_symtab **prev_pst;
2427 psymtab->objfile = objfile;
2428 psymtab->next = NULL;
2429 prev_pst = &(objfile->psymtabs);
2430 while ((*prev_pst) != NULL)
2431 prev_pst = &((*prev_pst)->next);
2432 (*prev_pst) = psymtab;
2440 discard_psymtab (struct partial_symtab *pst)
2442 struct partial_symtab **prev_pst;
2445 Empty psymtabs happen as a result of header files which don't
2446 have any symbols in them. There can be a lot of them. But this
2447 check is wrong, in that a psymtab with N_SLINE entries but
2448 nothing else is not empty, but we don't realize that. Fixing
2449 that without slowing things down might be tricky. */
2451 /* First, snip it out of the psymtab chain */
2453 prev_pst = &(pst->objfile->psymtabs);
2454 while ((*prev_pst) != pst)
2455 prev_pst = &((*prev_pst)->next);
2456 (*prev_pst) = pst->next;
2458 /* Next, put it on a free list for recycling */
2460 pst->next = pst->objfile->free_psymtabs;
2461 pst->objfile->free_psymtabs = pst;
2465 /* Reset all data structures in gdb which may contain references to symbol
2469 clear_symtab_users (void)
2471 /* Someday, we should do better than this, by only blowing away
2472 the things that really need to be blown. */
2474 /* Clear the "current" symtab first, because it is no longer valid.
2475 breakpoint_re_set may try to access the current symtab. */
2476 clear_current_source_symtab_and_line ();
2478 clear_value_history ();
2480 clear_internalvars ();
2481 breakpoint_re_set ();
2482 set_default_breakpoint (0, 0, 0, 0);
2483 clear_pc_function_cache ();
2484 if (deprecated_target_new_objfile_hook)
2485 deprecated_target_new_objfile_hook (NULL);
2489 clear_symtab_users_cleanup (void *ignore)
2491 clear_symtab_users ();
2494 /* clear_symtab_users_once:
2496 This function is run after symbol reading, or from a cleanup.
2497 If an old symbol table was obsoleted, the old symbol table
2498 has been blown away, but the other GDB data structures that may
2499 reference it have not yet been cleared or re-directed. (The old
2500 symtab was zapped, and the cleanup queued, in free_named_symtab()
2503 This function can be queued N times as a cleanup, or called
2504 directly; it will do all the work the first time, and then will be a
2505 no-op until the next time it is queued. This works by bumping a
2506 counter at queueing time. Much later when the cleanup is run, or at
2507 the end of symbol processing (in case the cleanup is discarded), if
2508 the queued count is greater than the "done-count", we do the work
2509 and set the done-count to the queued count. If the queued count is
2510 less than or equal to the done-count, we just ignore the call. This
2511 is needed because reading a single .o file will often replace many
2512 symtabs (one per .h file, for example), and we don't want to reset
2513 the breakpoints N times in the user's face.
2515 The reason we both queue a cleanup, and call it directly after symbol
2516 reading, is because the cleanup protects us in case of errors, but is
2517 discarded if symbol reading is successful. */
2520 /* FIXME: As free_named_symtabs is currently a big noop this function
2521 is no longer needed. */
2522 static void clear_symtab_users_once (void);
2524 static int clear_symtab_users_queued;
2525 static int clear_symtab_users_done;
2528 clear_symtab_users_once (void)
2530 /* Enforce once-per-`do_cleanups'-semantics */
2531 if (clear_symtab_users_queued <= clear_symtab_users_done)
2533 clear_symtab_users_done = clear_symtab_users_queued;
2535 clear_symtab_users ();
2539 /* Delete the specified psymtab, and any others that reference it. */
2542 cashier_psymtab (struct partial_symtab *pst)
2544 struct partial_symtab *ps, *pprev = NULL;
2547 /* Find its previous psymtab in the chain */
2548 for (ps = pst->objfile->psymtabs; ps; ps = ps->next)
2557 /* Unhook it from the chain. */
2558 if (ps == pst->objfile->psymtabs)
2559 pst->objfile->psymtabs = ps->next;
2561 pprev->next = ps->next;
2563 /* FIXME, we can't conveniently deallocate the entries in the
2564 partial_symbol lists (global_psymbols/static_psymbols) that
2565 this psymtab points to. These just take up space until all
2566 the psymtabs are reclaimed. Ditto the dependencies list and
2567 filename, which are all in the objfile_obstack. */
2569 /* We need to cashier any psymtab that has this one as a dependency... */
2571 for (ps = pst->objfile->psymtabs; ps; ps = ps->next)
2573 for (i = 0; i < ps->number_of_dependencies; i++)
2575 if (ps->dependencies[i] == pst)
2577 cashier_psymtab (ps);
2578 goto again; /* Must restart, chain has been munged. */
2585 /* If a symtab or psymtab for filename NAME is found, free it along
2586 with any dependent breakpoints, displays, etc.
2587 Used when loading new versions of object modules with the "add-file"
2588 command. This is only called on the top-level symtab or psymtab's name;
2589 it is not called for subsidiary files such as .h files.
2591 Return value is 1 if we blew away the environment, 0 if not.
2592 FIXME. The return value appears to never be used.
2594 FIXME. I think this is not the best way to do this. We should
2595 work on being gentler to the environment while still cleaning up
2596 all stray pointers into the freed symtab. */
2599 free_named_symtabs (char *name)
2602 /* FIXME: With the new method of each objfile having it's own
2603 psymtab list, this function needs serious rethinking. In particular,
2604 why was it ever necessary to toss psymtabs with specific compilation
2605 unit filenames, as opposed to all psymtabs from a particular symbol
2607 Well, the answer is that some systems permit reloading of particular
2608 compilation units. We want to blow away any old info about these
2609 compilation units, regardless of which objfiles they arrived in. --gnu. */
2612 struct symtab *prev;
2613 struct partial_symtab *ps;
2614 struct blockvector *bv;
2617 /* We only wack things if the symbol-reload switch is set. */
2618 if (!symbol_reloading)
2621 /* Some symbol formats have trouble providing file names... */
2622 if (name == 0 || *name == '\0')
2625 /* Look for a psymtab with the specified name. */
2628 for (ps = partial_symtab_list; ps; ps = ps->next)
2630 if (strcmp (name, ps->filename) == 0)
2632 cashier_psymtab (ps); /* Blow it away...and its little dog, too. */
2633 goto again2; /* Must restart, chain has been munged */
2637 /* Look for a symtab with the specified name. */
2639 for (s = symtab_list; s; s = s->next)
2641 if (strcmp (name, s->filename) == 0)
2648 if (s == symtab_list)
2649 symtab_list = s->next;
2651 prev->next = s->next;
2653 /* For now, queue a delete for all breakpoints, displays, etc., whether
2654 or not they depend on the symtab being freed. This should be
2655 changed so that only those data structures affected are deleted. */
2657 /* But don't delete anything if the symtab is empty.
2658 This test is necessary due to a bug in "dbxread.c" that
2659 causes empty symtabs to be created for N_SO symbols that
2660 contain the pathname of the object file. (This problem
2661 has been fixed in GDB 3.9x). */
2663 bv = BLOCKVECTOR (s);
2664 if (BLOCKVECTOR_NBLOCKS (bv) > 2
2665 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
2666 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)))
2668 complaint (&symfile_complaints, _("Replacing old symbols for `%s'"),
2670 clear_symtab_users_queued++;
2671 make_cleanup (clear_symtab_users_once, 0);
2675 complaint (&symfile_complaints, _("Empty symbol table found for `%s'"),
2682 /* It is still possible that some breakpoints will be affected
2683 even though no symtab was found, since the file might have
2684 been compiled without debugging, and hence not be associated
2685 with a symtab. In order to handle this correctly, we would need
2686 to keep a list of text address ranges for undebuggable files.
2687 For now, we do nothing, since this is a fairly obscure case. */
2691 /* FIXME, what about the minimal symbol table? */
2698 /* Allocate and partially fill a partial symtab. It will be
2699 completely filled at the end of the symbol list.
2701 FILENAME is the name of the symbol-file we are reading from. */
2703 struct partial_symtab *
2704 start_psymtab_common (struct objfile *objfile,
2705 struct section_offsets *section_offsets, char *filename,
2706 CORE_ADDR textlow, struct partial_symbol **global_syms,
2707 struct partial_symbol **static_syms)
2709 struct partial_symtab *psymtab;
2711 psymtab = allocate_psymtab (filename, objfile);
2712 psymtab->section_offsets = section_offsets;
2713 psymtab->textlow = textlow;
2714 psymtab->texthigh = psymtab->textlow; /* default */
2715 psymtab->globals_offset = global_syms - objfile->global_psymbols.list;
2716 psymtab->statics_offset = static_syms - objfile->static_psymbols.list;
2720 /* Add a symbol with a long value to a psymtab.
2721 Since one arg is a struct, we pass in a ptr and deref it (sigh).
2722 Return the partial symbol that has been added. */
2724 /* NOTE: carlton/2003-09-11: The reason why we return the partial
2725 symbol is so that callers can get access to the symbol's demangled
2726 name, which they don't have any cheap way to determine otherwise.
2727 (Currenly, dwarf2read.c is the only file who uses that information,
2728 though it's possible that other readers might in the future.)
2729 Elena wasn't thrilled about that, and I don't blame her, but we
2730 couldn't come up with a better way to get that information. If
2731 it's needed in other situations, we could consider breaking up
2732 SYMBOL_SET_NAMES to provide access to the demangled name lookup
2735 const struct partial_symbol *
2736 add_psymbol_to_list (char *name, int namelength, domain_enum domain,
2737 enum address_class class,
2738 struct psymbol_allocation_list *list, long val, /* Value as a long */
2739 CORE_ADDR coreaddr, /* Value as a CORE_ADDR */
2740 enum language language, struct objfile *objfile)
2742 struct partial_symbol *psym;
2743 char *buf = alloca (namelength + 1);
2744 /* psymbol is static so that there will be no uninitialized gaps in the
2745 structure which might contain random data, causing cache misses in
2747 static struct partial_symbol psymbol;
2749 /* Create local copy of the partial symbol */
2750 memcpy (buf, name, namelength);
2751 buf[namelength] = '\0';
2752 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2755 SYMBOL_VALUE (&psymbol) = val;
2759 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2761 SYMBOL_SECTION (&psymbol) = 0;
2762 SYMBOL_LANGUAGE (&psymbol) = language;
2763 PSYMBOL_DOMAIN (&psymbol) = domain;
2764 PSYMBOL_CLASS (&psymbol) = class;
2766 SYMBOL_SET_NAMES (&psymbol, buf, namelength, objfile);
2768 /* Stash the partial symbol away in the cache */
2769 psym = deprecated_bcache (&psymbol, sizeof (struct partial_symbol),
2770 objfile->psymbol_cache);
2772 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2773 if (list->next >= list->list + list->size)
2775 extend_psymbol_list (list, objfile);
2777 *list->next++ = psym;
2778 OBJSTAT (objfile, n_psyms++);
2783 /* Add a symbol with a long value to a psymtab. This differs from
2784 * add_psymbol_to_list above in taking both a mangled and a demangled
2788 add_psymbol_with_dem_name_to_list (char *name, int namelength, char *dem_name,
2789 int dem_namelength, domain_enum domain,
2790 enum address_class class,
2791 struct psymbol_allocation_list *list, long val, /* Value as a long */
2792 CORE_ADDR coreaddr, /* Value as a CORE_ADDR */
2793 enum language language,
2794 struct objfile *objfile)
2796 struct partial_symbol *psym;
2797 char *buf = alloca (namelength + 1);
2798 /* psymbol is static so that there will be no uninitialized gaps in the
2799 structure which might contain random data, causing cache misses in
2801 static struct partial_symbol psymbol;
2803 /* Create local copy of the partial symbol */
2805 memcpy (buf, name, namelength);
2806 buf[namelength] = '\0';
2807 DEPRECATED_SYMBOL_NAME (&psymbol) = deprecated_bcache (buf, namelength + 1,
2808 objfile->psymbol_cache);
2810 buf = alloca (dem_namelength + 1);
2811 memcpy (buf, dem_name, dem_namelength);
2812 buf[dem_namelength] = '\0';
2817 case language_cplus:
2818 SYMBOL_CPLUS_DEMANGLED_NAME (&psymbol) =
2819 deprecated_bcache (buf, dem_namelength + 1, objfile->psymbol_cache);
2821 /* FIXME What should be done for the default case? Ignoring for now. */
2824 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2827 SYMBOL_VALUE (&psymbol) = val;
2831 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2833 SYMBOL_SECTION (&psymbol) = 0;
2834 SYMBOL_LANGUAGE (&psymbol) = language;
2835 PSYMBOL_DOMAIN (&psymbol) = domain;
2836 PSYMBOL_CLASS (&psymbol) = class;
2837 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2839 /* Stash the partial symbol away in the cache */
2840 psym = deprecated_bcache (&psymbol, sizeof (struct partial_symbol),
2841 objfile->psymbol_cache);
2843 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2844 if (list->next >= list->list + list->size)
2846 extend_psymbol_list (list, objfile);
2848 *list->next++ = psym;
2849 OBJSTAT (objfile, n_psyms++);
2852 /* Initialize storage for partial symbols. */
2855 init_psymbol_list (struct objfile *objfile, int total_symbols)
2857 /* Free any previously allocated psymbol lists. */
2859 if (objfile->global_psymbols.list)
2861 xfree (objfile->global_psymbols.list);
2863 if (objfile->static_psymbols.list)
2865 xfree (objfile->static_psymbols.list);
2868 /* Current best guess is that approximately a twentieth
2869 of the total symbols (in a debugging file) are global or static
2872 objfile->global_psymbols.size = total_symbols / 10;
2873 objfile->static_psymbols.size = total_symbols / 10;
2875 if (objfile->global_psymbols.size > 0)
2877 objfile->global_psymbols.next =
2878 objfile->global_psymbols.list = (struct partial_symbol **)
2879 xmalloc ((objfile->global_psymbols.size
2880 * sizeof (struct partial_symbol *)));
2882 if (objfile->static_psymbols.size > 0)
2884 objfile->static_psymbols.next =
2885 objfile->static_psymbols.list = (struct partial_symbol **)
2886 xmalloc ((objfile->static_psymbols.size
2887 * sizeof (struct partial_symbol *)));
2892 The following code implements an abstraction for debugging overlay sections.
2894 The target model is as follows:
2895 1) The gnu linker will permit multiple sections to be mapped into the
2896 same VMA, each with its own unique LMA (or load address).
2897 2) It is assumed that some runtime mechanism exists for mapping the
2898 sections, one by one, from the load address into the VMA address.
2899 3) This code provides a mechanism for gdb to keep track of which
2900 sections should be considered to be mapped from the VMA to the LMA.
2901 This information is used for symbol lookup, and memory read/write.
2902 For instance, if a section has been mapped then its contents
2903 should be read from the VMA, otherwise from the LMA.
2905 Two levels of debugger support for overlays are available. One is
2906 "manual", in which the debugger relies on the user to tell it which
2907 overlays are currently mapped. This level of support is
2908 implemented entirely in the core debugger, and the information about
2909 whether a section is mapped is kept in the objfile->obj_section table.
2911 The second level of support is "automatic", and is only available if
2912 the target-specific code provides functionality to read the target's
2913 overlay mapping table, and translate its contents for the debugger
2914 (by updating the mapped state information in the obj_section tables).
2916 The interface is as follows:
2918 overlay map <name> -- tell gdb to consider this section mapped
2919 overlay unmap <name> -- tell gdb to consider this section unmapped
2920 overlay list -- list the sections that GDB thinks are mapped
2921 overlay read-target -- get the target's state of what's mapped
2922 overlay off/manual/auto -- set overlay debugging state
2923 Functional interface:
2924 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2925 section, return that section.
2926 find_pc_overlay(pc): find any overlay section that contains
2927 the pc, either in its VMA or its LMA
2928 overlay_is_mapped(sect): true if overlay is marked as mapped
2929 section_is_overlay(sect): true if section's VMA != LMA
2930 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2931 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2932 sections_overlap(sec1, sec2): true if mapped sec1 and sec2 ranges overlap
2933 overlay_mapped_address(...): map an address from section's LMA to VMA
2934 overlay_unmapped_address(...): map an address from section's VMA to LMA
2935 symbol_overlayed_address(...): Return a "current" address for symbol:
2936 either in VMA or LMA depending on whether
2937 the symbol's section is currently mapped
2940 /* Overlay debugging state: */
2942 enum overlay_debugging_state overlay_debugging = ovly_off;
2943 int overlay_cache_invalid = 0; /* True if need to refresh mapped state */
2945 /* Target vector for refreshing overlay mapped state */
2946 static void simple_overlay_update (struct obj_section *);
2947 void (*target_overlay_update) (struct obj_section *) = simple_overlay_update;
2949 /* Function: section_is_overlay (SECTION)
2950 Returns true if SECTION has VMA not equal to LMA, ie.
2951 SECTION is loaded at an address different from where it will "run". */
2954 section_is_overlay (asection *section)
2956 /* FIXME: need bfd *, so we can use bfd_section_lma methods. */
2958 if (overlay_debugging)
2959 if (section && section->lma != 0 &&
2960 section->vma != section->lma)
2966 /* Function: overlay_invalidate_all (void)
2967 Invalidate the mapped state of all overlay sections (mark it as stale). */
2970 overlay_invalidate_all (void)
2972 struct objfile *objfile;
2973 struct obj_section *sect;
2975 ALL_OBJSECTIONS (objfile, sect)
2976 if (section_is_overlay (sect->the_bfd_section))
2977 sect->ovly_mapped = -1;
2980 /* Function: overlay_is_mapped (SECTION)
2981 Returns true if section is an overlay, and is currently mapped.
2982 Private: public access is thru function section_is_mapped.
2984 Access to the ovly_mapped flag is restricted to this function, so
2985 that we can do automatic update. If the global flag
2986 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2987 overlay_invalidate_all. If the mapped state of the particular
2988 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2991 overlay_is_mapped (struct obj_section *osect)
2993 if (osect == 0 || !section_is_overlay (osect->the_bfd_section))
2996 switch (overlay_debugging)
3000 return 0; /* overlay debugging off */
3001 case ovly_auto: /* overlay debugging automatic */
3002 /* Unles there is a target_overlay_update function,
3003 there's really nothing useful to do here (can't really go auto) */
3004 if (target_overlay_update)
3006 if (overlay_cache_invalid)
3008 overlay_invalidate_all ();
3009 overlay_cache_invalid = 0;
3011 if (osect->ovly_mapped == -1)
3012 (*target_overlay_update) (osect);
3014 /* fall thru to manual case */
3015 case ovly_on: /* overlay debugging manual */
3016 return osect->ovly_mapped == 1;
3020 /* Function: section_is_mapped
3021 Returns true if section is an overlay, and is currently mapped. */
3024 section_is_mapped (asection *section)
3026 struct objfile *objfile;
3027 struct obj_section *osect;
3029 if (overlay_debugging)
3030 if (section && section_is_overlay (section))
3031 ALL_OBJSECTIONS (objfile, osect)
3032 if (osect->the_bfd_section == section)
3033 return overlay_is_mapped (osect);
3038 /* Function: pc_in_unmapped_range
3039 If PC falls into the lma range of SECTION, return true, else false. */
3042 pc_in_unmapped_range (CORE_ADDR pc, asection *section)
3044 /* FIXME: need bfd *, so we can use bfd_section_lma methods. */
3048 if (overlay_debugging)
3049 if (section && section_is_overlay (section))
3051 size = bfd_get_section_size (section);
3052 if (section->lma <= pc && pc < section->lma + size)
3058 /* Function: pc_in_mapped_range
3059 If PC falls into the vma range of SECTION, return true, else false. */
3062 pc_in_mapped_range (CORE_ADDR pc, asection *section)
3064 /* FIXME: need bfd *, so we can use bfd_section_vma methods. */
3068 if (overlay_debugging)
3069 if (section && section_is_overlay (section))
3071 size = bfd_get_section_size (section);
3072 if (section->vma <= pc && pc < section->vma + size)
3079 /* Return true if the mapped ranges of sections A and B overlap, false
3082 sections_overlap (asection *a, asection *b)
3084 /* FIXME: need bfd *, so we can use bfd_section_vma methods. */
3086 CORE_ADDR a_start = a->vma;
3087 CORE_ADDR a_end = a->vma + bfd_get_section_size (a);
3088 CORE_ADDR b_start = b->vma;
3089 CORE_ADDR b_end = b->vma + bfd_get_section_size (b);
3091 return (a_start < b_end && b_start < a_end);
3094 /* Function: overlay_unmapped_address (PC, SECTION)
3095 Returns the address corresponding to PC in the unmapped (load) range.
3096 May be the same as PC. */
3099 overlay_unmapped_address (CORE_ADDR pc, asection *section)
3101 /* FIXME: need bfd *, so we can use bfd_section_lma methods. */
3103 if (overlay_debugging)
3104 if (section && section_is_overlay (section) &&
3105 pc_in_mapped_range (pc, section))
3106 return pc + section->lma - section->vma;
3111 /* Function: overlay_mapped_address (PC, SECTION)
3112 Returns the address corresponding to PC in the mapped (runtime) range.
3113 May be the same as PC. */
3116 overlay_mapped_address (CORE_ADDR pc, asection *section)
3118 /* FIXME: need bfd *, so we can use bfd_section_vma methods. */
3120 if (overlay_debugging)
3121 if (section && section_is_overlay (section) &&
3122 pc_in_unmapped_range (pc, section))
3123 return pc + section->vma - section->lma;
3129 /* Function: symbol_overlayed_address
3130 Return one of two addresses (relative to the VMA or to the LMA),
3131 depending on whether the section is mapped or not. */
3134 symbol_overlayed_address (CORE_ADDR address, asection *section)
3136 if (overlay_debugging)
3138 /* If the symbol has no section, just return its regular address. */
3141 /* If the symbol's section is not an overlay, just return its address */
3142 if (!section_is_overlay (section))
3144 /* If the symbol's section is mapped, just return its address */
3145 if (section_is_mapped (section))
3148 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
3149 * then return its LOADED address rather than its vma address!!
3151 return overlay_unmapped_address (address, section);
3156 /* Function: find_pc_overlay (PC)
3157 Return the best-match overlay section for PC:
3158 If PC matches a mapped overlay section's VMA, return that section.
3159 Else if PC matches an unmapped section's VMA, return that section.
3160 Else if PC matches an unmapped section's LMA, return that section. */
3163 find_pc_overlay (CORE_ADDR pc)
3165 struct objfile *objfile;
3166 struct obj_section *osect, *best_match = NULL;
3168 if (overlay_debugging)
3169 ALL_OBJSECTIONS (objfile, osect)
3170 if (section_is_overlay (osect->the_bfd_section))
3172 if (pc_in_mapped_range (pc, osect->the_bfd_section))
3174 if (overlay_is_mapped (osect))
3175 return osect->the_bfd_section;
3179 else if (pc_in_unmapped_range (pc, osect->the_bfd_section))
3182 return best_match ? best_match->the_bfd_section : NULL;
3185 /* Function: find_pc_mapped_section (PC)
3186 If PC falls into the VMA address range of an overlay section that is
3187 currently marked as MAPPED, return that section. Else return NULL. */
3190 find_pc_mapped_section (CORE_ADDR pc)
3192 struct objfile *objfile;
3193 struct obj_section *osect;
3195 if (overlay_debugging)
3196 ALL_OBJSECTIONS (objfile, osect)
3197 if (pc_in_mapped_range (pc, osect->the_bfd_section) &&
3198 overlay_is_mapped (osect))
3199 return osect->the_bfd_section;
3204 /* Function: list_overlays_command
3205 Print a list of mapped sections and their PC ranges */
3208 list_overlays_command (char *args, int from_tty)
3211 struct objfile *objfile;
3212 struct obj_section *osect;
3214 if (overlay_debugging)
3215 ALL_OBJSECTIONS (objfile, osect)
3216 if (overlay_is_mapped (osect))
3222 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
3223 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
3224 size = bfd_get_section_size (osect->the_bfd_section);
3225 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
3227 printf_filtered ("Section %s, loaded at ", name);
3228 deprecated_print_address_numeric (lma, 1, gdb_stdout);
3229 puts_filtered (" - ");
3230 deprecated_print_address_numeric (lma + size, 1, gdb_stdout);
3231 printf_filtered (", mapped at ");
3232 deprecated_print_address_numeric (vma, 1, gdb_stdout);
3233 puts_filtered (" - ");
3234 deprecated_print_address_numeric (vma + size, 1, gdb_stdout);
3235 puts_filtered ("\n");
3240 printf_filtered (_("No sections are mapped.\n"));
3243 /* Function: map_overlay_command
3244 Mark the named section as mapped (ie. residing at its VMA address). */
3247 map_overlay_command (char *args, int from_tty)
3249 struct objfile *objfile, *objfile2;
3250 struct obj_section *sec, *sec2;
3253 if (!overlay_debugging)
3255 Overlay debugging not enabled. Use either the 'overlay auto' or\n\
3256 the 'overlay manual' command."));
3258 if (args == 0 || *args == 0)
3259 error (_("Argument required: name of an overlay section"));
3261 /* First, find a section matching the user supplied argument */
3262 ALL_OBJSECTIONS (objfile, sec)
3263 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3265 /* Now, check to see if the section is an overlay. */
3266 bfdsec = sec->the_bfd_section;
3267 if (!section_is_overlay (bfdsec))
3268 continue; /* not an overlay section */
3270 /* Mark the overlay as "mapped" */
3271 sec->ovly_mapped = 1;
3273 /* Next, make a pass and unmap any sections that are
3274 overlapped by this new section: */
3275 ALL_OBJSECTIONS (objfile2, sec2)
3276 if (sec2->ovly_mapped
3278 && sec->the_bfd_section != sec2->the_bfd_section
3279 && sections_overlap (sec->the_bfd_section,
3280 sec2->the_bfd_section))
3283 printf_unfiltered (_("Note: section %s unmapped by overlap\n"),
3284 bfd_section_name (objfile->obfd,
3285 sec2->the_bfd_section));
3286 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2 */
3290 error (_("No overlay section called %s"), args);
3293 /* Function: unmap_overlay_command
3294 Mark the overlay section as unmapped
3295 (ie. resident in its LMA address range, rather than the VMA range). */
3298 unmap_overlay_command (char *args, int from_tty)
3300 struct objfile *objfile;
3301 struct obj_section *sec;
3303 if (!overlay_debugging)
3305 Overlay debugging not enabled. Use either the 'overlay auto' or\n\
3306 the 'overlay manual' command."));
3308 if (args == 0 || *args == 0)
3309 error (_("Argument required: name of an overlay section"));
3311 /* First, find a section matching the user supplied argument */
3312 ALL_OBJSECTIONS (objfile, sec)
3313 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
3315 if (!sec->ovly_mapped)
3316 error (_("Section %s is not mapped"), args);
3317 sec->ovly_mapped = 0;
3320 error (_("No overlay section called %s"), args);
3323 /* Function: overlay_auto_command
3324 A utility command to turn on overlay debugging.
3325 Possibly this should be done via a set/show command. */
3328 overlay_auto_command (char *args, int from_tty)
3330 overlay_debugging = ovly_auto;
3331 enable_overlay_breakpoints ();
3333 printf_unfiltered (_("Automatic overlay debugging enabled."));
3336 /* Function: overlay_manual_command
3337 A utility command to turn on overlay debugging.
3338 Possibly this should be done via a set/show command. */
3341 overlay_manual_command (char *args, int from_tty)
3343 overlay_debugging = ovly_on;
3344 disable_overlay_breakpoints ();
3346 printf_unfiltered (_("Overlay debugging enabled."));
3349 /* Function: overlay_off_command
3350 A utility command to turn on overlay debugging.
3351 Possibly this should be done via a set/show command. */
3354 overlay_off_command (char *args, int from_tty)
3356 overlay_debugging = ovly_off;
3357 disable_overlay_breakpoints ();
3359 printf_unfiltered (_("Overlay debugging disabled."));
3363 overlay_load_command (char *args, int from_tty)
3365 if (target_overlay_update)
3366 (*target_overlay_update) (NULL);
3368 error (_("This target does not know how to read its overlay state."));
3371 /* Function: overlay_command
3372 A place-holder for a mis-typed command */
3374 /* Command list chain containing all defined "overlay" subcommands. */
3375 struct cmd_list_element *overlaylist;
3378 overlay_command (char *args, int from_tty)
3381 ("\"overlay\" must be followed by the name of an overlay command.\n");
3382 help_list (overlaylist, "overlay ", -1, gdb_stdout);
3386 /* Target Overlays for the "Simplest" overlay manager:
3388 This is GDB's default target overlay layer. It works with the
3389 minimal overlay manager supplied as an example by Cygnus. The
3390 entry point is via a function pointer "target_overlay_update",
3391 so targets that use a different runtime overlay manager can
3392 substitute their own overlay_update function and take over the
3395 The overlay_update function pokes around in the target's data structures
3396 to see what overlays are mapped, and updates GDB's overlay mapping with
3399 In this simple implementation, the target data structures are as follows:
3400 unsigned _novlys; /# number of overlay sections #/
3401 unsigned _ovly_table[_novlys][4] = {
3402 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
3403 {..., ..., ..., ...},
3405 unsigned _novly_regions; /# number of overlay regions #/
3406 unsigned _ovly_region_table[_novly_regions][3] = {
3407 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
3410 These functions will attempt to update GDB's mappedness state in the
3411 symbol section table, based on the target's mappedness state.
3413 To do this, we keep a cached copy of the target's _ovly_table, and
3414 attempt to detect when the cached copy is invalidated. The main
3415 entry point is "simple_overlay_update(SECT), which looks up SECT in
3416 the cached table and re-reads only the entry for that section from
3417 the target (whenever possible).
3420 /* Cached, dynamically allocated copies of the target data structures: */
3421 static unsigned (*cache_ovly_table)[4] = 0;
3423 static unsigned (*cache_ovly_region_table)[3] = 0;
3425 static unsigned cache_novlys = 0;
3427 static unsigned cache_novly_regions = 0;
3429 static CORE_ADDR cache_ovly_table_base = 0;
3431 static CORE_ADDR cache_ovly_region_table_base = 0;
3435 VMA, SIZE, LMA, MAPPED
3437 #define TARGET_LONG_BYTES (TARGET_LONG_BIT / TARGET_CHAR_BIT)
3439 /* Throw away the cached copy of _ovly_table */
3441 simple_free_overlay_table (void)
3443 if (cache_ovly_table)
3444 xfree (cache_ovly_table);
3446 cache_ovly_table = NULL;
3447 cache_ovly_table_base = 0;
3451 /* Throw away the cached copy of _ovly_region_table */
3453 simple_free_overlay_region_table (void)
3455 if (cache_ovly_region_table)
3456 xfree (cache_ovly_region_table);
3457 cache_novly_regions = 0;
3458 cache_ovly_region_table = NULL;
3459 cache_ovly_region_table_base = 0;
3463 /* Read an array of ints from the target into a local buffer.
3464 Convert to host order. int LEN is number of ints */
3466 read_target_long_array (CORE_ADDR memaddr, unsigned int *myaddr, int len)
3468 /* FIXME (alloca): Not safe if array is very large. */
3469 char *buf = alloca (len * TARGET_LONG_BYTES);
3472 read_memory (memaddr, buf, len * TARGET_LONG_BYTES);
3473 for (i = 0; i < len; i++)
3474 myaddr[i] = extract_unsigned_integer (TARGET_LONG_BYTES * i + buf,
3478 /* Find and grab a copy of the target _ovly_table
3479 (and _novlys, which is needed for the table's size) */
3481 simple_read_overlay_table (void)
3483 struct minimal_symbol *novlys_msym, *ovly_table_msym;
3485 simple_free_overlay_table ();
3486 novlys_msym = lookup_minimal_symbol ("_novlys", NULL, NULL);
3489 error (_("Error reading inferior's overlay table: "
3490 "couldn't find `_novlys' variable\n"
3491 "in inferior. Use `overlay manual' mode."));
3495 ovly_table_msym = lookup_minimal_symbol ("_ovly_table", NULL, NULL);
3496 if (! ovly_table_msym)
3498 error (_("Error reading inferior's overlay table: couldn't find "
3499 "`_ovly_table' array\n"
3500 "in inferior. Use `overlay manual' mode."));
3504 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (novlys_msym), 4);
3506 = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
3507 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (ovly_table_msym);
3508 read_target_long_array (cache_ovly_table_base,
3509 (int *) cache_ovly_table,
3512 return 1; /* SUCCESS */
3516 /* Find and grab a copy of the target _ovly_region_table
3517 (and _novly_regions, which is needed for the table's size) */
3519 simple_read_overlay_region_table (void)
3521 struct minimal_symbol *msym;
3523 simple_free_overlay_region_table ();
3524 msym = lookup_minimal_symbol ("_novly_regions", NULL, NULL);
3526 cache_novly_regions = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
3528 return 0; /* failure */
3529 cache_ovly_region_table = (void *) xmalloc (cache_novly_regions * 12);
3530 if (cache_ovly_region_table != NULL)
3532 msym = lookup_minimal_symbol ("_ovly_region_table", NULL, NULL);
3535 cache_ovly_region_table_base = SYMBOL_VALUE_ADDRESS (msym);
3536 read_target_long_array (cache_ovly_region_table_base,
3537 (int *) cache_ovly_region_table,
3538 cache_novly_regions * 3);
3541 return 0; /* failure */
3544 return 0; /* failure */
3545 return 1; /* SUCCESS */
3549 /* Function: simple_overlay_update_1
3550 A helper function for simple_overlay_update. Assuming a cached copy
3551 of _ovly_table exists, look through it to find an entry whose vma,
3552 lma and size match those of OSECT. Re-read the entry and make sure
3553 it still matches OSECT (else the table may no longer be valid).
3554 Set OSECT's mapped state to match the entry. Return: 1 for
3555 success, 0 for failure. */
3558 simple_overlay_update_1 (struct obj_section *osect)
3561 bfd *obfd = osect->objfile->obfd;
3562 asection *bsect = osect->the_bfd_section;
3564 size = bfd_get_section_size (osect->the_bfd_section);
3565 for (i = 0; i < cache_novlys; i++)
3566 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3567 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3568 /* && cache_ovly_table[i][SIZE] == size */ )
3570 read_target_long_array (cache_ovly_table_base + i * TARGET_LONG_BYTES,
3571 (int *) cache_ovly_table[i], 4);
3572 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3573 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3574 /* && cache_ovly_table[i][SIZE] == size */ )
3576 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3579 else /* Warning! Warning! Target's ovly table has changed! */
3585 /* Function: simple_overlay_update
3586 If OSECT is NULL, then update all sections' mapped state
3587 (after re-reading the entire target _ovly_table).
3588 If OSECT is non-NULL, then try to find a matching entry in the
3589 cached ovly_table and update only OSECT's mapped state.
3590 If a cached entry can't be found or the cache isn't valid, then
3591 re-read the entire cache, and go ahead and update all sections. */
3594 simple_overlay_update (struct obj_section *osect)
3596 struct objfile *objfile;
3598 /* Were we given an osect to look up? NULL means do all of them. */
3600 /* Have we got a cached copy of the target's overlay table? */
3601 if (cache_ovly_table != NULL)
3602 /* Does its cached location match what's currently in the symtab? */
3603 if (cache_ovly_table_base ==
3604 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", NULL, NULL)))
3605 /* Then go ahead and try to look up this single section in the cache */
3606 if (simple_overlay_update_1 (osect))
3607 /* Found it! We're done. */
3610 /* Cached table no good: need to read the entire table anew.
3611 Or else we want all the sections, in which case it's actually
3612 more efficient to read the whole table in one block anyway. */
3614 if (! simple_read_overlay_table ())
3617 /* Now may as well update all sections, even if only one was requested. */
3618 ALL_OBJSECTIONS (objfile, osect)
3619 if (section_is_overlay (osect->the_bfd_section))
3622 bfd *obfd = osect->objfile->obfd;
3623 asection *bsect = osect->the_bfd_section;
3625 size = bfd_get_section_size (bsect);
3626 for (i = 0; i < cache_novlys; i++)
3627 if (cache_ovly_table[i][VMA] == bfd_section_vma (obfd, bsect)
3628 && cache_ovly_table[i][LMA] == bfd_section_lma (obfd, bsect)
3629 /* && cache_ovly_table[i][SIZE] == size */ )
3630 { /* obj_section matches i'th entry in ovly_table */
3631 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3632 break; /* finished with inner for loop: break out */
3637 /* Set the output sections and output offsets for section SECTP in
3638 ABFD. The relocation code in BFD will read these offsets, so we
3639 need to be sure they're initialized. We map each section to itself,
3640 with no offset; this means that SECTP->vma will be honored. */
3643 symfile_dummy_outputs (bfd *abfd, asection *sectp, void *dummy)
3645 sectp->output_section = sectp;
3646 sectp->output_offset = 0;
3649 /* Relocate the contents of a debug section SECTP in ABFD. The
3650 contents are stored in BUF if it is non-NULL, or returned in a
3651 malloc'd buffer otherwise.
3653 For some platforms and debug info formats, shared libraries contain
3654 relocations against the debug sections (particularly for DWARF-2;
3655 one affected platform is PowerPC GNU/Linux, although it depends on
3656 the version of the linker in use). Also, ELF object files naturally
3657 have unresolved relocations for their debug sections. We need to apply
3658 the relocations in order to get the locations of symbols correct. */
3661 symfile_relocate_debug_section (bfd *abfd, asection *sectp, bfd_byte *buf)
3663 /* We're only interested in debugging sections with relocation
3665 if ((sectp->flags & SEC_RELOC) == 0)
3667 if ((sectp->flags & SEC_DEBUGGING) == 0)
3670 /* We will handle section offsets properly elsewhere, so relocate as if
3671 all sections begin at 0. */
3672 bfd_map_over_sections (abfd, symfile_dummy_outputs, NULL);
3674 return bfd_simple_get_relocated_section_contents (abfd, sectp, buf, NULL);
3678 _initialize_symfile (void)
3680 struct cmd_list_element *c;
3682 c = add_cmd ("symbol-file", class_files, symbol_file_command, _("\
3683 Load symbol table from executable file FILE.\n\
3684 The `file' command can also load symbol tables, as well as setting the file\n\
3685 to execute."), &cmdlist);
3686 set_cmd_completer (c, filename_completer);
3688 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command, _("\
3689 Usage: add-symbol-file FILE ADDR [-s <SECT> <SECT_ADDR> -s <SECT> <SECT_ADDR> ...]\n\
3690 Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
3691 ADDR is the starting address of the file's text.\n\
3692 The optional arguments are section-name section-address pairs and\n\
3693 should be specified if the data and bss segments are not contiguous\n\
3694 with the text. SECT is a section name to be loaded at SECT_ADDR."),
3696 set_cmd_completer (c, filename_completer);
3698 c = add_cmd ("add-shared-symbol-files", class_files,
3699 add_shared_symbol_files_command, _("\
3700 Load the symbols from shared objects in the dynamic linker's link map."),
3702 c = add_alias_cmd ("assf", "add-shared-symbol-files", class_files, 1,
3705 c = add_cmd ("load", class_files, load_command, _("\
3706 Dynamically load FILE into the running program, and record its symbols\n\
3707 for access from GDB."), &cmdlist);
3708 set_cmd_completer (c, filename_completer);
3710 add_setshow_boolean_cmd ("symbol-reloading", class_support,
3711 &symbol_reloading, _("\
3712 Set dynamic symbol table reloading multiple times in one run."), _("\
3713 Show dynamic symbol table reloading multiple times in one run."), NULL,
3715 show_symbol_reloading,
3716 &setlist, &showlist);
3718 add_prefix_cmd ("overlay", class_support, overlay_command,
3719 _("Commands for debugging overlays."), &overlaylist,
3720 "overlay ", 0, &cmdlist);
3722 add_com_alias ("ovly", "overlay", class_alias, 1);
3723 add_com_alias ("ov", "overlay", class_alias, 1);
3725 add_cmd ("map-overlay", class_support, map_overlay_command,
3726 _("Assert that an overlay section is mapped."), &overlaylist);
3728 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
3729 _("Assert that an overlay section is unmapped."), &overlaylist);
3731 add_cmd ("list-overlays", class_support, list_overlays_command,
3732 _("List mappings of overlay sections."), &overlaylist);
3734 add_cmd ("manual", class_support, overlay_manual_command,
3735 _("Enable overlay debugging."), &overlaylist);
3736 add_cmd ("off", class_support, overlay_off_command,
3737 _("Disable overlay debugging."), &overlaylist);
3738 add_cmd ("auto", class_support, overlay_auto_command,
3739 _("Enable automatic overlay debugging."), &overlaylist);
3740 add_cmd ("load-target", class_support, overlay_load_command,
3741 _("Read the overlay mapping state from the target."), &overlaylist);
3743 /* Filename extension to source language lookup table: */
3744 init_filename_language_table ();
3745 add_setshow_string_noescape_cmd ("extension-language", class_files,
3747 Set mapping between filename extension and source language."), _("\
3748 Show mapping between filename extension and source language."), _("\
3749 Usage: set extension-language .foo bar"),
3750 set_ext_lang_command,
3752 &setlist, &showlist);
3754 add_info ("extensions", info_ext_lang_command,
3755 _("All filename extensions associated with a source language."));
3757 add_setshow_integer_cmd ("download-write-size", class_obscure,
3758 &download_write_size, _("\
3759 Set the write size used when downloading a program."), _("\
3760 Show the write size used when downloading a program."), _("\
3761 Only used when downloading a program onto a remote\n\
3762 target. Specify zero, or a negative value, to disable\n\
3763 blocked writes. The actual size of each transfer is also\n\
3764 limited by the size of the target packet and the memory\n\
3767 show_download_write_size,
3768 &setlist, &showlist);
3770 debug_file_directory = xstrdup (DEBUGDIR);
3771 add_setshow_optional_filename_cmd ("debug-file-directory", class_support,
3772 &debug_file_directory, _("\
3773 Set the directory where separate debug symbols are searched for."), _("\
3774 Show the directory where separate debug symbols are searched for."), _("\
3775 Separate debug symbols are first searched for in the same\n\
3776 directory as the binary, then in the `" DEBUG_SUBDIRECTORY "' subdirectory,\n\
3777 and lastly at the path of the directory of the binary with\n\
3778 the global debug-file directory prepended."),
3780 show_debug_file_directory,
3781 &setlist, &showlist);