1 /* Generic symbol file reading for the GNU debugger, GDB.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998
3 Free Software Foundation, Inc.
4 Contributed by Cygnus Support, using pieces from other GDB modules.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
33 #include "breakpoint.h"
35 #include "complaints.h"
37 #include "inferior.h" /* for write_pc */
38 #include "gdb-stabs.h"
42 #include <sys/types.h>
44 #include "gdb_string.h"
55 /* Some HP-UX related globals to clear when a new "main"
56 symbol file is loaded. HP-specific. */
58 extern int hp_som_som_object_present;
59 extern int hp_cxx_exception_support_initialized;
60 #define RESET_HP_UX_GLOBALS() do {\
61 hp_som_som_object_present = 0; /* indicates HP-compiled code */ \
62 hp_cxx_exception_support_initialized = 0; /* must reinitialize exception stuff */ \
66 int (*ui_load_progress_hook) PARAMS ((char *, unsigned long));
67 void (*pre_add_symbol_hook) PARAMS ((char *));
68 void (*post_add_symbol_hook) PARAMS ((void));
70 /* Global variables owned by this file */
71 int readnow_symbol_files; /* Read full symbols immediately */
73 struct complaint oldsyms_complaint =
75 "Replacing old symbols for `%s'", 0, 0
78 struct complaint empty_symtab_complaint =
80 "Empty symbol table found for `%s'", 0, 0
83 struct complaint unknown_option_complaint =
85 "Unknown option `%s' ignored", 0, 0
88 /* External variables and functions referenced. */
90 extern int info_verbose;
92 extern void report_transfer_performance PARAMS ((unsigned long,
95 /* Functions this file defines */
98 static int simple_read_overlay_region_table PARAMS ((void));
99 static void simple_free_overlay_region_table PARAMS ((void));
102 static void set_initial_language PARAMS ((void));
104 static void load_command PARAMS ((char *, int));
106 static void add_symbol_file_command PARAMS ((char *, int));
108 static void add_shared_symbol_files_command PARAMS ((char *, int));
110 static void cashier_psymtab PARAMS ((struct partial_symtab *));
112 static int compare_psymbols PARAMS ((const void *, const void *));
114 static int compare_symbols PARAMS ((const void *, const void *));
116 bfd *symfile_bfd_open PARAMS ((char *));
118 static void find_sym_fns PARAMS ((struct objfile *));
120 static void decrement_reading_symtab PARAMS ((void *));
122 static void overlay_invalidate_all PARAMS ((void));
124 static int overlay_is_mapped PARAMS ((struct obj_section *));
126 void list_overlays_command PARAMS ((char *, int));
128 void map_overlay_command PARAMS ((char *, int));
130 void unmap_overlay_command PARAMS ((char *, int));
132 static void overlay_auto_command PARAMS ((char *, int));
134 static void overlay_manual_command PARAMS ((char *, int));
136 static void overlay_off_command PARAMS ((char *, int));
138 static void overlay_load_command PARAMS ((char *, int));
140 static void overlay_command PARAMS ((char *, int));
142 static void simple_free_overlay_table PARAMS ((void));
144 static void read_target_long_array PARAMS ((CORE_ADDR, unsigned int *, int));
146 static int simple_read_overlay_table PARAMS ((void));
148 static int simple_overlay_update_1 PARAMS ((struct obj_section *));
150 static void add_filename_language PARAMS ((char *ext, enum language lang));
152 static void set_ext_lang_command PARAMS ((char *args, int from_tty));
154 static void info_ext_lang_command PARAMS ((char *args, int from_tty));
156 static void init_filename_language_table PARAMS ((void));
158 void _initialize_symfile PARAMS ((void));
160 /* List of all available sym_fns. On gdb startup, each object file reader
161 calls add_symtab_fns() to register information on each format it is
164 static struct sym_fns *symtab_fns = NULL;
166 /* Flag for whether user will be reloading symbols multiple times.
167 Defaults to ON for VxWorks, otherwise OFF. */
169 #ifdef SYMBOL_RELOADING_DEFAULT
170 int symbol_reloading = SYMBOL_RELOADING_DEFAULT;
172 int symbol_reloading = 0;
175 /* If non-zero, then on HP-UX (i.e., platforms that use somsolib.c),
176 this variable is interpreted as a threshhold. If adding a new
177 library's symbol table to those already known to the debugger would
178 exceed this threshhold, then the shlib's symbols are not added.
180 If non-zero on other platforms, shared library symbols will be added
181 automatically when the inferior is created, new libraries are loaded,
182 or when attaching to the inferior. This is almost always what users
183 will want to have happen; but for very large programs, the startup
184 time will be excessive, and so if this is a problem, the user can
185 clear this flag and then add the shared library symbols as needed.
186 Note that there is a potential for confusion, since if the shared
187 library symbols are not loaded, commands like "info fun" will *not*
188 report all the functions that are actually present.
190 Note that HP-UX interprets this variable to mean, "threshhold size
191 in megabytes, where zero means never add". Other platforms interpret
192 this variable to mean, "always add if non-zero, never add if zero."
195 int auto_solib_add = 1;
198 /* Since this function is called from within qsort, in an ANSI environment
199 it must conform to the prototype for qsort, which specifies that the
200 comparison function takes two "void *" pointers. */
203 compare_symbols (s1p, s2p)
207 register struct symbol **s1, **s2;
209 s1 = (struct symbol **) s1p;
210 s2 = (struct symbol **) s2p;
212 return (STRCMP (SYMBOL_NAME (*s1), SYMBOL_NAME (*s2)));
219 compare_psymbols -- compare two partial symbols by name
223 Given pointers to pointers to two partial symbol table entries,
224 compare them by name and return -N, 0, or +N (ala strcmp).
225 Typically used by sorting routines like qsort().
229 Does direct compare of first two characters before punting
230 and passing to strcmp for longer compares. Note that the
231 original version had a bug whereby two null strings or two
232 identically named one character strings would return the
233 comparison of memory following the null byte.
238 compare_psymbols (s1p, s2p)
242 register char *st1 = SYMBOL_NAME (*(struct partial_symbol **) s1p);
243 register char *st2 = SYMBOL_NAME (*(struct partial_symbol **) s2p);
245 if ((st1[0] - st2[0]) || !st1[0])
247 return (st1[0] - st2[0]);
249 else if ((st1[1] - st2[1]) || !st1[1])
251 return (st1[1] - st2[1]);
255 /* Note: I replaced the STRCMP line (commented out below)
256 * with a simpler "strcmp()" which compares the 2 strings
257 * from the beginning. (STRCMP is a macro which first compares
258 * the initial characters, then falls back on strcmp).
259 * The reason is that the STRCMP line was tickling a C compiler
260 * bug on HP-UX 10.30, which is avoided with the simpler
261 * code. The performance gain from the more complicated code
262 * is negligible, given that we have already checked the
263 * initial 2 characters above. I reported the compiler bug,
264 * and once it is fixed the original line can be put back. RT
266 /* return ( STRCMP (st1 + 2, st2 + 2)); */
267 return (strcmp (st1, st2));
272 sort_pst_symbols (pst)
273 struct partial_symtab *pst;
275 /* Sort the global list; don't sort the static list */
277 qsort (pst->objfile->global_psymbols.list + pst->globals_offset,
278 pst->n_global_syms, sizeof (struct partial_symbol *),
282 /* Call sort_block_syms to sort alphabetically the symbols of one block. */
286 register struct block *b;
288 qsort (&BLOCK_SYM (b, 0), BLOCK_NSYMS (b),
289 sizeof (struct symbol *), compare_symbols);
292 /* Call sort_symtab_syms to sort alphabetically
293 the symbols of each block of one symtab. */
297 register struct symtab *s;
299 register struct blockvector *bv;
302 register struct block *b;
306 bv = BLOCKVECTOR (s);
307 nbl = BLOCKVECTOR_NBLOCKS (bv);
308 for (i = 0; i < nbl; i++)
310 b = BLOCKVECTOR_BLOCK (bv, i);
311 if (BLOCK_SHOULD_SORT (b))
316 /* Make a null terminated copy of the string at PTR with SIZE characters in
317 the obstack pointed to by OBSTACKP . Returns the address of the copy.
318 Note that the string at PTR does not have to be null terminated, I.E. it
319 may be part of a larger string and we are only saving a substring. */
322 obsavestring (ptr, size, obstackp)
325 struct obstack *obstackp;
327 register char *p = (char *) obstack_alloc (obstackp, size + 1);
328 /* Open-coded memcpy--saves function call time. These strings are usually
329 short. FIXME: Is this really still true with a compiler that can
332 register char *p1 = ptr;
333 register char *p2 = p;
334 char *end = ptr + size;
342 /* Concatenate strings S1, S2 and S3; return the new string. Space is found
343 in the obstack pointed to by OBSTACKP. */
346 obconcat (obstackp, s1, s2, s3)
347 struct obstack *obstackp;
348 const char *s1, *s2, *s3;
350 register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
351 register char *val = (char *) obstack_alloc (obstackp, len);
358 /* True if we are nested inside psymtab_to_symtab. */
360 int currently_reading_symtab = 0;
363 decrement_reading_symtab (dummy)
366 currently_reading_symtab--;
369 /* Get the symbol table that corresponds to a partial_symtab.
370 This is fast after the first time you do it. In fact, there
371 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
375 psymtab_to_symtab (pst)
376 register struct partial_symtab *pst;
378 /* If it's been looked up before, return it. */
382 /* If it has not yet been read in, read it. */
385 struct cleanup *back_to = make_cleanup (decrement_reading_symtab, NULL);
386 currently_reading_symtab++;
387 (*pst->read_symtab) (pst);
388 do_cleanups (back_to);
394 /* Initialize entry point information for this objfile. */
397 init_entry_point_info (objfile)
398 struct objfile *objfile;
400 /* Save startup file's range of PC addresses to help blockframe.c
401 decide where the bottom of the stack is. */
403 if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
405 /* Executable file -- record its entry point so we'll recognize
406 the startup file because it contains the entry point. */
407 objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
411 /* Examination of non-executable.o files. Short-circuit this stuff. */
412 objfile->ei.entry_point = INVALID_ENTRY_POINT;
414 objfile->ei.entry_file_lowpc = INVALID_ENTRY_LOWPC;
415 objfile->ei.entry_file_highpc = INVALID_ENTRY_HIGHPC;
416 objfile->ei.entry_func_lowpc = INVALID_ENTRY_LOWPC;
417 objfile->ei.entry_func_highpc = INVALID_ENTRY_HIGHPC;
418 objfile->ei.main_func_lowpc = INVALID_ENTRY_LOWPC;
419 objfile->ei.main_func_highpc = INVALID_ENTRY_HIGHPC;
422 /* Get current entry point address. */
425 entry_point_address ()
427 return symfile_objfile ? symfile_objfile->ei.entry_point : 0;
430 /* Remember the lowest-addressed loadable section we've seen.
431 This function is called via bfd_map_over_sections.
433 In case of equal vmas, the section with the largest size becomes the
434 lowest-addressed loadable section.
436 If the vmas and sizes are equal, the last section is considered the
437 lowest-addressed loadable section. */
440 find_lowest_section (abfd, sect, obj)
445 asection **lowest = (asection **) obj;
447 if (0 == (bfd_get_section_flags (abfd, sect) & SEC_LOAD))
450 *lowest = sect; /* First loadable section */
451 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
452 *lowest = sect; /* A lower loadable section */
453 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
454 && (bfd_section_size (abfd, (*lowest))
455 <= bfd_section_size (abfd, sect)))
459 /* Parse the user's idea of an offset for dynamic linking, into our idea
460 of how to represent it for fast symbol reading. This is the default
461 version of the sym_fns.sym_offsets function for symbol readers that
462 don't need to do anything special. It allocates a section_offsets table
463 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
466 default_symfile_offsets (objfile, addrs)
467 struct objfile *objfile;
468 struct section_addr_info *addrs;
472 objfile->num_sections = SECT_OFF_MAX;
473 objfile->section_offsets = (struct section_offsets *)
474 obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS);
475 memset (objfile->section_offsets, 0, SIZEOF_SECTION_OFFSETS);
477 /* If user explicitly specified values for data and bss, set them here. */
479 if (addrs->text_addr)
480 ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT) = addrs->text_addr;
481 if (addrs->data_addr)
482 ANOFFSET (objfile->section_offsets, SECT_OFF_DATA) = addrs->data_addr;
484 ANOFFSET (objfile->section_offsets, SECT_OFF_BSS) = addrs->bss_addr;
486 /* Now calculate offsets for other sections. */
487 for (i = 0; i < MAX_SECTIONS && addrs->other[i].name; i++)
489 struct other_sections *osp ;
491 osp = &addrs->other[i] ;
492 if (addrs->other[i].addr == 0)
495 if (strcmp (".text", osp->name) == 0)
496 SECT_OFF_TEXT = osp->sectindex ;
497 else if (strcmp (".data", osp->name) == 0)
498 SECT_OFF_DATA = osp->sectindex ;
499 else if (strcmp (".bss", osp->name) == 0)
500 SECT_OFF_BSS = osp->sectindex ;
502 /* Record all sections in offsets */
503 ANOFFSET (objfile->section_offsets, osp->sectindex) = osp->addr;
508 /* Process a symbol file, as either the main file or as a dynamically
511 OBJFILE is where the symbols are to be read from.
513 ADDR is the address where the text segment was loaded, unless the
514 objfile is the main symbol file, in which case it is zero.
516 MAINLINE is nonzero if this is the main symbol file, or zero if
517 it's an extra symbol file such as dynamically loaded code.
519 VERBO is nonzero if the caller has printed a verbose message about
520 the symbol reading (and complaints can be more terse about it). */
523 syms_from_objfile (objfile, addrs, mainline, verbo)
524 struct objfile *objfile;
525 struct section_addr_info *addrs;
529 struct section_offsets *section_offsets;
530 asection *lower_sect;
532 CORE_ADDR lower_offset;
533 struct section_addr_info local_addr;
534 struct cleanup *old_chain;
537 /* If ADDRS is NULL, initialize the local section_addr_info struct and
538 point ADDRS to it. We now establish the convention that an addr of
539 zero means no load address was specified. */
543 memset (&local_addr, 0, sizeof (local_addr));
547 init_entry_point_info (objfile);
548 find_sym_fns (objfile);
550 /* Make sure that partially constructed symbol tables will be cleaned up
551 if an error occurs during symbol reading. */
552 old_chain = make_cleanup ((make_cleanup_func) free_objfile, objfile);
556 /* We will modify the main symbol table, make sure that all its users
557 will be cleaned up if an error occurs during symbol reading. */
558 make_cleanup ((make_cleanup_func) clear_symtab_users, 0);
560 /* Since no error yet, throw away the old symbol table. */
562 if (symfile_objfile != NULL)
564 free_objfile (symfile_objfile);
565 symfile_objfile = NULL;
568 /* Currently we keep symbols from the add-symbol-file command.
569 If the user wants to get rid of them, they should do "symbol-file"
570 without arguments first. Not sure this is the best behavior
573 (*objfile->sf->sym_new_init) (objfile);
576 /* Convert addr into an offset rather than an absolute address.
577 We find the lowest address of a loaded segment in the objfile,
578 and assume that <addr> is where that got loaded.
580 We no longer warn if the lowest section is not a text segment (as
581 happens for the PA64 port. */
584 /* No offset from objfile addresses. */
585 addrs -> text_addr = 0;
586 addrs -> data_addr = 0;
587 addrs -> bss_addr = 0;
591 /* Find lowest loadable section to be used as starting point for
592 continguous sections. FIXME!! won't work without call to find
593 .text first, but this assumes text is lowest section. */
594 lower_sect = bfd_get_section_by_name (objfile->obfd, ".text");
595 if (lower_sect == NULL)
596 bfd_map_over_sections (objfile->obfd, find_lowest_section,
598 if (lower_sect == NULL)
599 warning ("no loadable sections found in added symbol-file %s",
601 else if ((bfd_get_section_flags (objfile->obfd, lower_sect) & SEC_CODE)
603 warning ("Lowest section in %s is %s at %s",
605 bfd_section_name (objfile->obfd, lower_sect),
606 paddr (bfd_section_vma (objfile->obfd, lower_sect)));
607 if (lower_sect != NULL)
608 lower_offset = bfd_section_vma (objfile->obfd, lower_sect);
612 /* Calculate offsets for the loadable sections.
613 FIXME! Sections must be in order of increasing loadable section
614 so that contiguous sections can use the lower-offset!!!
616 Adjust offsets if the segments are not contiguous.
617 If the section is contiguous, its offset should be set to
618 the offset of the highest loadable section lower than it
619 (the loadable section directly below it in memory).
620 this_offset = lower_offset = lower_addr - lower_orig_addr */
622 /* FIXME: These sections will not need special treatment because ALL
623 sections are in the other sections table */
625 if (addrs->text_addr != 0)
627 sect = bfd_get_section_by_name (objfile->obfd, ".text");
630 addrs->text_addr -= bfd_section_vma (objfile->obfd, sect);
631 lower_offset = addrs->text_addr;
635 /* ??? who's below me? */
636 addrs->text_addr = lower_offset;
638 if (addrs->data_addr != 0)
640 sect = bfd_get_section_by_name (objfile->obfd, ".data");
643 addrs->data_addr -= bfd_section_vma (objfile->obfd, sect);
644 lower_offset = addrs->data_addr;
648 addrs->data_addr = lower_offset;
650 if (addrs->bss_addr != 0)
652 sect = bfd_get_section_by_name (objfile->obfd, ".bss");
655 addrs->bss_addr -= bfd_section_vma (objfile->obfd, sect);
656 lower_offset = addrs->bss_addr;
660 addrs->bss_addr = lower_offset;
662 /* Now calculate offsets for other sections. */
663 for (i=0 ; i < MAX_SECTIONS && addrs->other[i].name; i++)
666 if (addrs->other[i].addr != 0)
668 sect=bfd_get_section_by_name(objfile->obfd, addrs->other[i].name);
671 addrs->other[i].addr -= bfd_section_vma (objfile->obfd, sect);
672 lower_offset = addrs->other[i].addr;
673 addrs->other[i].sectindex = sect->index ;
677 warning ("section %s not found in %s", addrs->other[i].name,
679 addrs->other[i].addr = 0;
683 addrs->other[i].addr = lower_offset;
687 /* Initialize symbol reading routines for this objfile, allow complaints to
688 appear for this new file, and record how verbose to be, then do the
689 initial symbol reading for this file. */
691 (*objfile->sf->sym_init) (objfile);
692 clear_complaints (1, verbo);
694 (*objfile->sf->sym_offsets) (objfile, addrs);
696 #ifndef IBM6000_TARGET
697 /* This is a SVR4/SunOS specific hack, I think. In any event, it
698 screws RS/6000. sym_offsets should be doing this sort of thing,
699 because it knows the mapping between bfd sections and
701 /* This is a hack. As far as I can tell, section offsets are not
702 target dependent. They are all set to addr with a couple of
703 exceptions. The exceptions are sysvr4 shared libraries, whose
704 offsets are kept in solib structures anyway and rs6000 xcoff
705 which handles shared libraries in a completely unique way.
707 Section offsets are built similarly, except that they are built
708 by adding addr in all cases because there is no clear mapping
709 from section_offsets into actual sections. Note that solib.c
710 has a different algorithm for finding section offsets.
712 These should probably all be collapsed into some target
713 independent form of shared library support. FIXME. */
717 struct obj_section *s;
719 /* Map section offsets in "addr" back to the object's
720 sections by comparing the section names with bfd's
721 section names. Then adjust the section address by
722 the offset. */ /* for gdb/13815 */
724 ALL_OBJFILE_OSECTIONS (objfile, s)
726 CORE_ADDR s_addr = 0;
729 if (strcmp (s->the_bfd_section->name, ".text") == 0)
730 s_addr = addrs->text_addr;
731 else if (strcmp (s->the_bfd_section->name, ".data") == 0)
732 s_addr = addrs->data_addr;
733 else if (strcmp (s->the_bfd_section->name, ".bss") == 0)
734 s_addr = addrs->bss_addr;
736 for (i = 0; !s_addr && addrs->other[i].name; i++)
737 if (strcmp (s->the_bfd_section->name, addrs->other[i].name) == 0)
738 s_addr = addrs->other[i].addr; /* end added for gdb/13815 */
740 s->addr -= s->offset;
742 s->endaddr -= s->offset;
743 s->endaddr += s_addr;
747 #endif /* not IBM6000_TARGET */
749 (*objfile->sf->sym_read) (objfile, mainline);
751 if (!have_partial_symbols () && !have_full_symbols ())
754 printf_filtered ("(no debugging symbols found)...");
758 /* Don't allow char * to have a typename (else would get caddr_t).
759 Ditto void *. FIXME: Check whether this is now done by all the
760 symbol readers themselves (many of them now do), and if so remove
763 TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0;
764 TYPE_NAME (lookup_pointer_type (builtin_type_void)) = 0;
766 /* Mark the objfile has having had initial symbol read attempted. Note
767 that this does not mean we found any symbols... */
769 objfile->flags |= OBJF_SYMS;
771 /* Discard cleanups as symbol reading was successful. */
773 discard_cleanups (old_chain);
775 /* Call this after reading in a new symbol table to give target
776 dependant code a crack at the new symbols. For instance, this
777 could be used to update the values of target-specific symbols GDB
778 needs to keep track of (such as _sigtramp, or whatever). */
780 TARGET_SYMFILE_POSTREAD (objfile);
783 /* Perform required actions after either reading in the initial
784 symbols for a new objfile, or mapping in the symbols from a reusable
788 new_symfile_objfile (objfile, mainline, verbo)
789 struct objfile *objfile;
794 /* If this is the main symbol file we have to clean up all users of the
795 old main symbol file. Otherwise it is sufficient to fixup all the
796 breakpoints that may have been redefined by this symbol file. */
799 /* OK, make it the "real" symbol file. */
800 symfile_objfile = objfile;
802 clear_symtab_users ();
806 breakpoint_re_set ();
809 /* We're done reading the symbol file; finish off complaints. */
810 clear_complaints (0, verbo);
813 /* Process a symbol file, as either the main file or as a dynamically
816 NAME is the file name (which will be tilde-expanded and made
817 absolute herein) (but we don't free or modify NAME itself).
818 FROM_TTY says how verbose to be. MAINLINE specifies whether this
819 is the main symbol file, or whether it's an extra symbol file such
820 as dynamically loaded code. If !mainline, ADDR is the address
821 where the text segment was loaded.
823 Upon success, returns a pointer to the objfile that was added.
824 Upon failure, jumps back to command level (never returns). */
827 symbol_file_add (name, from_tty, addrs, mainline, flags)
830 struct section_addr_info *addrs;
834 struct objfile *objfile;
835 struct partial_symtab *psymtab;
838 /* Open a bfd for the file, and give user a chance to burp if we'd be
839 interactively wiping out any existing symbols. */
841 abfd = symfile_bfd_open (name);
843 if ((have_full_symbols () || have_partial_symbols ())
846 && !query ("Load new symbol table from \"%s\"? ", name))
847 error ("Not confirmed.");
849 objfile = allocate_objfile (abfd, flags);
851 /* If the objfile uses a mapped symbol file, and we have a psymtab for
852 it, then skip reading any symbols at this time. */
854 if ((objfile->flags & OBJF_MAPPED) && (objfile->flags & OBJF_SYMS))
856 /* We mapped in an existing symbol table file that already has had
857 initial symbol reading performed, so we can skip that part. Notify
858 the user that instead of reading the symbols, they have been mapped.
860 if (from_tty || info_verbose)
862 printf_filtered ("Mapped symbols for %s...", name);
864 gdb_flush (gdb_stdout);
866 init_entry_point_info (objfile);
867 find_sym_fns (objfile);
871 /* We either created a new mapped symbol table, mapped an existing
872 symbol table file which has not had initial symbol reading
873 performed, or need to read an unmapped symbol table. */
874 if (from_tty || info_verbose)
876 if (pre_add_symbol_hook)
877 pre_add_symbol_hook (name);
880 printf_filtered ("Reading symbols from %s...", name);
882 gdb_flush (gdb_stdout);
885 syms_from_objfile (objfile, addrs, mainline, from_tty);
888 /* We now have at least a partial symbol table. Check to see if the
889 user requested that all symbols be read on initial access via either
890 the gdb startup command line or on a per symbol file basis. Expand
891 all partial symbol tables for this objfile if so. */
893 if ((flags & OBJF_READNOW) || readnow_symbol_files)
895 if (from_tty || info_verbose)
897 printf_filtered ("expanding to full symbols...");
899 gdb_flush (gdb_stdout);
902 for (psymtab = objfile->psymtabs;
904 psymtab = psymtab->next)
906 psymtab_to_symtab (psymtab);
910 if (from_tty || info_verbose)
912 if (post_add_symbol_hook)
913 post_add_symbol_hook ();
916 printf_filtered ("done.\n");
917 gdb_flush (gdb_stdout);
921 new_symfile_objfile (objfile, mainline, from_tty);
923 target_new_objfile (objfile);
928 /* This is the symbol-file command. Read the file, analyze its
929 symbols, and add a struct symtab to a symtab list. The syntax of
930 the command is rather bizarre--(1) buildargv implements various
931 quoting conventions which are undocumented and have little or
932 nothing in common with the way things are quoted (or not quoted)
933 elsewhere in GDB, (2) options are used, which are not generally
934 used in GDB (perhaps "set mapped on", "set readnow on" would be
935 better), (3) the order of options matters, which is contrary to GNU
936 conventions (because it is confusing and inconvenient). */
939 symbol_file_command (args, from_tty)
945 CORE_ADDR text_relocation = 0; /* text_relocation */
946 struct cleanup *cleanups;
947 int flags = OBJF_USERLOADED;
953 if ((have_full_symbols () || have_partial_symbols ())
955 && !query ("Discard symbol table from `%s'? ",
956 symfile_objfile->name))
957 error ("Not confirmed.");
958 free_all_objfiles ();
960 /* solib descriptors may have handles to objfiles. Since their
961 storage has just been released, we'd better wipe the solib
964 #if defined(SOLIB_RESTART)
968 symfile_objfile = NULL;
971 printf_unfiltered ("No symbol file now.\n");
974 RESET_HP_UX_GLOBALS ();
979 if ((argv = buildargv (args)) == NULL)
983 cleanups = make_cleanup_freeargv (argv);
984 while (*argv != NULL)
986 if (STREQ (*argv, "-mapped"))
988 flags |= OBJF_MAPPED;
990 else if (STREQ (*argv, "-readnow"))
992 flags |= OBJF_READNOW;
994 else if (**argv == '-')
996 error ("unknown option `%s'", *argv);
1004 /* this is for rombug remote only, to get the text relocation by
1005 using link command */
1006 p = strrchr (name, '/');
1012 target_link (p, &text_relocation);
1014 if (text_relocation == (CORE_ADDR) 0)
1016 else if (text_relocation == (CORE_ADDR) -1)
1018 symbol_file_add (name, from_tty, NULL, 1, flags);
1020 RESET_HP_UX_GLOBALS ();
1025 struct section_addr_info section_addrs;
1026 memset (§ion_addrs, 0, sizeof (section_addrs));
1027 section_addrs.text_addr = (CORE_ADDR) text_relocation;
1028 symbol_file_add (name, from_tty, §ion_addrs, 0, flags);
1031 /* Getting new symbols may change our opinion about what is
1033 reinit_frame_cache ();
1035 set_initial_language ();
1042 error ("no symbol file name was specified");
1044 TUIDO (((TuiOpaqueFuncPtr) tuiDisplayMainFunction));
1045 do_cleanups (cleanups);
1049 /* Set the initial language.
1051 A better solution would be to record the language in the psymtab when reading
1052 partial symbols, and then use it (if known) to set the language. This would
1053 be a win for formats that encode the language in an easily discoverable place,
1054 such as DWARF. For stabs, we can jump through hoops looking for specially
1055 named symbols or try to intuit the language from the specific type of stabs
1056 we find, but we can't do that until later when we read in full symbols.
1060 set_initial_language ()
1062 struct partial_symtab *pst;
1063 enum language lang = language_unknown;
1065 pst = find_main_psymtab ();
1068 if (pst->filename != NULL)
1070 lang = deduce_language_from_filename (pst->filename);
1072 if (lang == language_unknown)
1074 /* Make C the default language */
1077 set_language (lang);
1078 expected_language = current_language; /* Don't warn the user */
1082 /* Open file specified by NAME and hand it off to BFD for preliminary
1083 analysis. Result is a newly initialized bfd *, which includes a newly
1084 malloc'd` copy of NAME (tilde-expanded and made absolute).
1085 In case of trouble, error() is called. */
1088 symfile_bfd_open (name)
1093 char *absolute_name;
1097 name = tilde_expand (name); /* Returns 1st new malloc'd copy */
1099 /* Look down path for it, allocate 2nd new malloc'd copy. */
1100 desc = openp (getenv ("PATH"), 1, name, O_RDONLY | O_BINARY, 0, &absolute_name);
1101 #if defined(__GO32__) || defined(_WIN32)
1104 char *exename = alloca (strlen (name) + 5);
1105 strcat (strcpy (exename, name), ".exe");
1106 desc = openp (getenv ("PATH"), 1, exename, O_RDONLY | O_BINARY,
1112 make_cleanup (free, name);
1113 perror_with_name (name);
1115 free (name); /* Free 1st new malloc'd copy */
1116 name = absolute_name; /* Keep 2nd malloc'd copy in bfd */
1117 /* It'll be freed in free_objfile(). */
1119 sym_bfd = bfd_fdopenr (name, gnutarget, desc);
1123 make_cleanup (free, name);
1124 error ("\"%s\": can't open to read symbols: %s.", name,
1125 bfd_errmsg (bfd_get_error ()));
1127 sym_bfd->cacheable = true;
1129 if (!bfd_check_format (sym_bfd, bfd_object))
1131 /* FIXME: should be checking for errors from bfd_close (for one thing,
1132 on error it does not free all the storage associated with the
1134 bfd_close (sym_bfd); /* This also closes desc */
1135 make_cleanup (free, name);
1136 error ("\"%s\": can't read symbols: %s.", name,
1137 bfd_errmsg (bfd_get_error ()));
1142 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
1143 startup by the _initialize routine in each object file format reader,
1144 to register information about each format the the reader is prepared
1151 sf->next = symtab_fns;
1156 /* Initialize to read symbols from the symbol file sym_bfd. It either
1157 returns or calls error(). The result is an initialized struct sym_fns
1158 in the objfile structure, that contains cached information about the
1162 find_sym_fns (objfile)
1163 struct objfile *objfile;
1166 enum bfd_flavour our_flavour = bfd_get_flavour (objfile->obfd);
1167 char *our_target = bfd_get_target (objfile->obfd);
1169 /* Special kludge for RS/6000 and PowerMac. See xcoffread.c. */
1170 if (STREQ (our_target, "aixcoff-rs6000") ||
1171 STREQ (our_target, "xcoff-powermac"))
1172 our_flavour = (enum bfd_flavour) -1;
1174 /* Special kludge for apollo. See dstread.c. */
1175 if (STREQN (our_target, "apollo", 6))
1176 our_flavour = (enum bfd_flavour) -2;
1178 for (sf = symtab_fns; sf != NULL; sf = sf->next)
1180 if (our_flavour == sf->sym_flavour)
1186 error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
1187 bfd_get_target (objfile->obfd));
1190 /* This function runs the load command of our current target. */
1193 load_command (arg, from_tty)
1198 arg = get_exec_file (1);
1199 target_load (arg, from_tty);
1202 /* This version of "load" should be usable for any target. Currently
1203 it is just used for remote targets, not inftarg.c or core files,
1204 on the theory that only in that case is it useful.
1206 Avoiding xmodem and the like seems like a win (a) because we don't have
1207 to worry about finding it, and (b) On VMS, fork() is very slow and so
1208 we don't want to run a subprocess. On the other hand, I'm not sure how
1209 performance compares. */
1210 #define GENERIC_LOAD_CHUNK 256
1211 #define VALIDATE_DOWNLOAD 0
1213 generic_load (filename, from_tty)
1217 struct cleanup *old_cleanups;
1220 time_t start_time, end_time; /* Start and end times of download */
1221 unsigned long data_count = 0; /* Number of bytes transferred to memory */
1223 unsigned long load_offset = 0; /* offset to add to vma for each section */
1224 char buf[GENERIC_LOAD_CHUNK + 8];
1225 #if VALIDATE_DOWNLOAD
1226 char verify_buffer[GENERIC_LOAD_CHUNK + 8];
1229 /* enable user to specify address for downloading as 2nd arg to load */
1230 n = sscanf (filename, "%s 0x%lx", buf, &load_offset);
1236 loadfile_bfd = bfd_openr (filename, gnutarget);
1237 if (loadfile_bfd == NULL)
1239 perror_with_name (filename);
1242 /* FIXME: should be checking for errors from bfd_close (for one thing,
1243 on error it does not free all the storage associated with the
1245 old_cleanups = make_cleanup ((make_cleanup_func) bfd_close, loadfile_bfd);
1247 if (!bfd_check_format (loadfile_bfd, bfd_object))
1249 error ("\"%s\" is not an object file: %s", filename,
1250 bfd_errmsg (bfd_get_error ()));
1253 start_time = time (NULL);
1255 for (s = loadfile_bfd->sections; s; s = s->next)
1257 if (s->flags & SEC_LOAD)
1261 size = bfd_get_section_size_before_reloc (s);
1265 struct cleanup *old_chain;
1267 unsigned long l = size;
1273 l = l > GENERIC_LOAD_CHUNK ? GENERIC_LOAD_CHUNK : l;
1275 buffer = xmalloc (size);
1276 old_chain = make_cleanup (free, buffer);
1281 /* Is this really necessary? I guess it gives the user something
1282 to look at during a long download. */
1283 printf_filtered ("Loading section %s, size 0x%lx lma ",
1284 bfd_get_section_name (loadfile_bfd, s),
1285 (unsigned long) size);
1286 print_address_numeric (lma, 1, gdb_stdout);
1287 printf_filtered ("\n");
1289 bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size);
1291 sect = (char *) bfd_get_section_name (loadfile_bfd, s);
1295 len = (size - sent) < l ? (size - sent) : l;
1297 err = target_write_memory (lma, buffer, len);
1298 if (ui_load_progress_hook)
1299 if (ui_load_progress_hook (sect, sent))
1300 error ("Canceled the download");
1301 #if VALIDATE_DOWNLOAD
1302 /* Broken memories and broken monitors manifest themselves
1303 here when bring new computers to life.
1304 This doubles already slow downloads.
1309 target_read_memory (lma, verify_buffer, len);
1310 if (0 != bcmp (buffer, verify_buffer, len))
1311 error ("Download verify failed at %08x",
1312 (unsigned long) lma);
1320 while (err == 0 && sent < size);
1323 error ("Memory access error while loading section %s.",
1324 bfd_get_section_name (loadfile_bfd, s));
1326 do_cleanups (old_chain);
1331 end_time = time (NULL);
1333 unsigned long entry;
1334 entry = bfd_get_start_address (loadfile_bfd);
1335 printf_filtered ("Start address 0x%lx , load size %ld\n", entry, data_count);
1336 /* We were doing this in remote-mips.c, I suspect it is right
1337 for other targets too. */
1341 /* FIXME: are we supposed to call symbol_file_add or not? According to
1342 a comment from remote-mips.c (where a call to symbol_file_add was
1343 commented out), making the call confuses GDB if more than one file is
1344 loaded in. remote-nindy.c had no call to symbol_file_add, but remote-vx.c
1347 report_transfer_performance (data_count, start_time, end_time);
1349 do_cleanups (old_cleanups);
1352 /* Report how fast the transfer went. */
1355 report_transfer_performance (data_count, start_time, end_time)
1356 unsigned long data_count;
1357 time_t start_time, end_time;
1359 printf_filtered ("Transfer rate: ");
1360 if (end_time != start_time)
1361 printf_filtered ("%ld bits/sec",
1362 (data_count * 8) / (end_time - start_time));
1364 printf_filtered ("%ld bits in <1 sec", (data_count * 8));
1365 printf_filtered (".\n");
1368 /* This function allows the addition of incrementally linked object files.
1369 It does not modify any state in the target, only in the debugger. */
1373 add_symbol_file_command (args, from_tty)
1378 CORE_ADDR text_addr;
1379 int flags = OBJF_USERLOADED;
1381 int expecting_option = 0;
1382 int option_index = 0;
1388 enum { OPT_SECTION } type;
1391 } opt[SECT_OFF_MAX];
1392 struct section_addr_info section_addrs;
1398 error ("add-symbol-file takes a file name and an address");
1401 /* Make a copy of the string that we can safely write into. */
1403 args = strdup (args);
1404 make_cleanup (free, args);
1406 /* Ensure section_addrs is initialized */
1407 memset (§ion_addrs, 0, sizeof (section_addrs));
1409 /* Pick off any -option args and the file name. */
1411 while (*args != '\000')
1413 while (isspace (*args))
1418 while ((*args != '\000') && !isspace (*args))
1422 if (*args != '\000')
1428 if (expecting_option)
1430 opt[option_index++].value = arg;
1431 expecting_option = 0;
1441 opt[option_index].type = OPT_SECTION;
1442 opt[option_index].name = ".text";
1443 opt[option_index++].value = arg;
1446 opt[option_index].type = OPT_SECTION;
1447 opt[option_index].name = ".data";
1448 opt[option_index++].value = arg;
1451 opt[option_index].type = OPT_SECTION;
1452 opt[option_index].name = ".bss";
1453 opt[option_index++].value = arg;
1456 warning ("Too many arguments entered; see \"help add-symbol-file\" for command syntax.");
1461 else if (STREQ (arg, "-mapped"))
1463 flags |= OBJF_MAPPED;
1465 else if (STREQ (arg, "-readnow"))
1467 flags |= OBJF_READNOW;
1469 else if (STREQN (arg, "-T", 2))
1471 if (option_index >= SECT_OFF_MAX)
1473 warning ("Number of options exceeds maximum allowed.");
1477 expecting_option = 1;
1478 opt[option_index].type = OPT_SECTION;
1479 opt[option_index].name = arg + 2;
1484 error ("Unknown option `%s'", arg);
1490 error ("add-symbol-file takes a file name");
1492 name = tilde_expand (name);
1493 make_cleanup (free, name);
1495 if (option_index > 0)
1497 /* Print the prompt for the query below.
1498 We have to split this up into 3 print statements because
1499 local_hex_string returns a local static string. */
1501 printf_filtered ("add symbol table from file \"%s\" at\n", name);
1502 for (i = 0; i < option_index; i++)
1504 switch (opt[i].type)
1509 char *val = opt[i].value;
1510 char *sec = opt[i].name;
1513 if (val[0] == '0' && val[1] == 'x')
1514 addr = strtoul (val+2, NULL, 16);
1516 addr = strtoul (val, NULL, 10);
1518 if (strcmp (sec, ".text") == 0)
1519 section_addrs.text_addr = addr;
1520 else if (strcmp (sec, ".data") == 0)
1521 section_addrs.data_addr = addr;
1522 else if (strcmp (sec, ".bss") == 0)
1523 section_addrs.bss_addr = addr;
1524 /* Add the section to the others even if it is a
1525 text data or bss section. This is redundent but
1526 eventually, none will be given special treatment */
1528 section_addrs.other[sec_num].name = strdup (sec);
1529 make_cleanup (free, section_addrs.other[sec_num].name);
1530 section_addrs.other[sec_num++].addr = addr;
1531 printf_filtered ("\t%s_addr = %s\n",
1533 local_hex_string ((unsigned long)addr));
1536 /* The object's sections are initialized when a
1537 call is made to build_objfile_section_table (objfile).
1538 This happens in reread_symbols.
1539 At this point, we don't know what file type this is,
1540 so we can't determine what section names are valid. */
1544 complain (&unknown_option_complaint, opt[i].name);
1547 /* Eventually, these hard coded names will be obsolete */
1548 /* All the addresses will be on the others section */
1552 CORE_ADDR text_addr;
1553 target_link (name, &text_addr);
1554 if (text_addr == (CORE_ADDR) -1)
1555 error("Don't know how to get text start location for this file");
1556 section_addrs.text_addr = text_addr;
1557 section_addrs.data_addr = 0;
1558 section_addrs.bss_addr = 0;
1559 printf_filtered("add symbol table from file \"%s\" at text_addr = %s?\n",
1560 name, local_hex_string ((unsigned long)text_addr));
1562 if (from_tty && (!query ("%s", "")))
1563 error ("Not confirmed.");
1565 symbol_file_add (name, from_tty, §ion_addrs, 0, flags);
1567 /* Getting new symbols may change our opinion about what is
1569 reinit_frame_cache ();
1573 add_shared_symbol_files_command (args, from_tty)
1577 #ifdef ADD_SHARED_SYMBOL_FILES
1578 ADD_SHARED_SYMBOL_FILES (args, from_tty);
1580 error ("This command is not available in this configuration of GDB.");
1584 /* Re-read symbols if a symbol-file has changed. */
1588 struct objfile *objfile;
1591 struct stat new_statbuf;
1594 /* With the addition of shared libraries, this should be modified,
1595 the load time should be saved in the partial symbol tables, since
1596 different tables may come from different source files. FIXME.
1597 This routine should then walk down each partial symbol table
1598 and see if the symbol table that it originates from has been changed */
1600 for (objfile = object_files; objfile; objfile = objfile->next)
1604 #ifdef IBM6000_TARGET
1605 /* If this object is from a shared library, then you should
1606 stat on the library name, not member name. */
1608 if (objfile->obfd->my_archive)
1609 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
1612 res = stat (objfile->name, &new_statbuf);
1615 /* FIXME, should use print_sys_errmsg but it's not filtered. */
1616 printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
1620 new_modtime = new_statbuf.st_mtime;
1621 if (new_modtime != objfile->mtime)
1623 struct cleanup *old_cleanups;
1624 struct section_offsets *offsets;
1626 char *obfd_filename;
1628 printf_filtered ("`%s' has changed; re-reading symbols.\n",
1631 /* There are various functions like symbol_file_add,
1632 symfile_bfd_open, syms_from_objfile, etc., which might
1633 appear to do what we want. But they have various other
1634 effects which we *don't* want. So we just do stuff
1635 ourselves. We don't worry about mapped files (for one thing,
1636 any mapped file will be out of date). */
1638 /* If we get an error, blow away this objfile (not sure if
1639 that is the correct response for things like shared
1641 old_cleanups = make_cleanup ((make_cleanup_func) free_objfile,
1643 /* We need to do this whenever any symbols go away. */
1644 make_cleanup ((make_cleanup_func) clear_symtab_users, 0);
1646 /* Clean up any state BFD has sitting around. We don't need
1647 to close the descriptor but BFD lacks a way of closing the
1648 BFD without closing the descriptor. */
1649 obfd_filename = bfd_get_filename (objfile->obfd);
1650 if (!bfd_close (objfile->obfd))
1651 error ("Can't close BFD for %s: %s", objfile->name,
1652 bfd_errmsg (bfd_get_error ()));
1653 objfile->obfd = bfd_openr (obfd_filename, gnutarget);
1654 if (objfile->obfd == NULL)
1655 error ("Can't open %s to read symbols.", objfile->name);
1656 /* bfd_openr sets cacheable to true, which is what we want. */
1657 if (!bfd_check_format (objfile->obfd, bfd_object))
1658 error ("Can't read symbols from %s: %s.", objfile->name,
1659 bfd_errmsg (bfd_get_error ()));
1661 /* Save the offsets, we will nuke them with the rest of the
1663 num_offsets = objfile->num_sections;
1664 offsets = (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);
1665 memcpy (offsets, objfile->section_offsets, SIZEOF_SECTION_OFFSETS);
1667 /* Nuke all the state that we will re-read. Much of the following
1668 code which sets things to NULL really is necessary to tell
1669 other parts of GDB that there is nothing currently there. */
1671 /* FIXME: Do we have to free a whole linked list, or is this
1673 if (objfile->global_psymbols.list)
1674 mfree (objfile->md, objfile->global_psymbols.list);
1675 memset (&objfile->global_psymbols, 0,
1676 sizeof (objfile->global_psymbols));
1677 if (objfile->static_psymbols.list)
1678 mfree (objfile->md, objfile->static_psymbols.list);
1679 memset (&objfile->static_psymbols, 0,
1680 sizeof (objfile->static_psymbols));
1682 /* Free the obstacks for non-reusable objfiles */
1683 obstack_free (&objfile->psymbol_cache.cache, 0);
1684 memset (&objfile->psymbol_cache, 0,
1685 sizeof (objfile->psymbol_cache));
1686 obstack_free (&objfile->psymbol_obstack, 0);
1687 obstack_free (&objfile->symbol_obstack, 0);
1688 obstack_free (&objfile->type_obstack, 0);
1689 objfile->sections = NULL;
1690 objfile->symtabs = NULL;
1691 objfile->psymtabs = NULL;
1692 objfile->free_psymtabs = NULL;
1693 objfile->msymbols = NULL;
1694 objfile->minimal_symbol_count = 0;
1695 objfile->fundamental_types = NULL;
1696 if (objfile->sf != NULL)
1698 (*objfile->sf->sym_finish) (objfile);
1701 /* We never make this a mapped file. */
1703 /* obstack_specify_allocation also initializes the obstack so
1705 obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0,
1707 obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0,
1709 obstack_specify_allocation (&objfile->symbol_obstack, 0, 0,
1711 obstack_specify_allocation (&objfile->type_obstack, 0, 0,
1713 if (build_objfile_section_table (objfile))
1715 error ("Can't find the file sections in `%s': %s",
1716 objfile->name, bfd_errmsg (bfd_get_error ()));
1719 /* We use the same section offsets as from last time. I'm not
1720 sure whether that is always correct for shared libraries. */
1721 objfile->section_offsets = (struct section_offsets *)
1722 obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS);
1723 memcpy (objfile->section_offsets, offsets, SIZEOF_SECTION_OFFSETS);
1724 objfile->num_sections = num_offsets;
1726 /* What the hell is sym_new_init for, anyway? The concept of
1727 distinguishing between the main file and additional files
1728 in this way seems rather dubious. */
1729 if (objfile == symfile_objfile)
1731 (*objfile->sf->sym_new_init) (objfile);
1733 RESET_HP_UX_GLOBALS ();
1737 (*objfile->sf->sym_init) (objfile);
1738 clear_complaints (1, 1);
1739 /* The "mainline" parameter is a hideous hack; I think leaving it
1740 zero is OK since dbxread.c also does what it needs to do if
1741 objfile->global_psymbols.size is 0. */
1742 (*objfile->sf->sym_read) (objfile, 0);
1743 if (!have_partial_symbols () && !have_full_symbols ())
1746 printf_filtered ("(no debugging symbols found)\n");
1749 objfile->flags |= OBJF_SYMS;
1751 /* We're done reading the symbol file; finish off complaints. */
1752 clear_complaints (0, 1);
1754 /* Getting new symbols may change our opinion about what is
1757 reinit_frame_cache ();
1759 /* Discard cleanups as symbol reading was successful. */
1760 discard_cleanups (old_cleanups);
1762 /* If the mtime has changed between the time we set new_modtime
1763 and now, we *want* this to be out of date, so don't call stat
1765 objfile->mtime = new_modtime;
1768 /* Call this after reading in a new symbol table to give target
1769 dependant code a crack at the new symbols. For instance, this
1770 could be used to update the values of target-specific symbols GDB
1771 needs to keep track of (such as _sigtramp, or whatever). */
1773 TARGET_SYMFILE_POSTREAD (objfile);
1779 clear_symtab_users ();
1791 static filename_language *filename_language_table;
1792 static int fl_table_size, fl_table_next;
1795 add_filename_language (ext, lang)
1799 if (fl_table_next >= fl_table_size)
1801 fl_table_size += 10;
1802 filename_language_table = realloc (filename_language_table,
1806 filename_language_table[fl_table_next].ext = strsave (ext);
1807 filename_language_table[fl_table_next].lang = lang;
1811 static char *ext_args;
1814 set_ext_lang_command (args, from_tty)
1819 char *cp = ext_args;
1822 /* First arg is filename extension, starting with '.' */
1824 error ("'%s': Filename extension must begin with '.'", ext_args);
1826 /* Find end of first arg. */
1827 while (*cp && !isspace (*cp))
1831 error ("'%s': two arguments required -- filename extension and language",
1834 /* Null-terminate first arg */
1837 /* Find beginning of second arg, which should be a source language. */
1838 while (*cp && isspace (*cp))
1842 error ("'%s': two arguments required -- filename extension and language",
1845 /* Lookup the language from among those we know. */
1846 lang = language_enum (cp);
1848 /* Now lookup the filename extension: do we already know it? */
1849 for (i = 0; i < fl_table_next; i++)
1850 if (0 == strcmp (ext_args, filename_language_table[i].ext))
1853 if (i >= fl_table_next)
1855 /* new file extension */
1856 add_filename_language (ext_args, lang);
1860 /* redefining a previously known filename extension */
1863 /* query ("Really make files of type %s '%s'?", */
1864 /* ext_args, language_str (lang)); */
1866 free (filename_language_table[i].ext);
1867 filename_language_table[i].ext = strsave (ext_args);
1868 filename_language_table[i].lang = lang;
1873 info_ext_lang_command (args, from_tty)
1879 printf_filtered ("Filename extensions and the languages they represent:");
1880 printf_filtered ("\n\n");
1881 for (i = 0; i < fl_table_next; i++)
1882 printf_filtered ("\t%s\t- %s\n",
1883 filename_language_table[i].ext,
1884 language_str (filename_language_table[i].lang));
1888 init_filename_language_table ()
1890 if (fl_table_size == 0) /* protect against repetition */
1894 filename_language_table =
1895 xmalloc (fl_table_size * sizeof (*filename_language_table));
1896 add_filename_language (".c", language_c);
1897 add_filename_language (".C", language_cplus);
1898 add_filename_language (".cc", language_cplus);
1899 add_filename_language (".cp", language_cplus);
1900 add_filename_language (".cpp", language_cplus);
1901 add_filename_language (".cxx", language_cplus);
1902 add_filename_language (".c++", language_cplus);
1903 add_filename_language (".java", language_java);
1904 add_filename_language (".class", language_java);
1905 add_filename_language (".ch", language_chill);
1906 add_filename_language (".c186", language_chill);
1907 add_filename_language (".c286", language_chill);
1908 add_filename_language (".f", language_fortran);
1909 add_filename_language (".F", language_fortran);
1910 add_filename_language (".s", language_asm);
1911 add_filename_language (".S", language_asm);
1916 deduce_language_from_filename (filename)
1922 if (filename != NULL)
1923 if ((cp = strrchr (filename, '.')) != NULL)
1924 for (i = 0; i < fl_table_next; i++)
1925 if (strcmp (cp, filename_language_table[i].ext) == 0)
1926 return filename_language_table[i].lang;
1928 return language_unknown;
1933 Allocate and partly initialize a new symbol table. Return a pointer
1934 to it. error() if no space.
1936 Caller must set these fields:
1942 possibly free_named_symtabs (symtab->filename);
1946 allocate_symtab (filename, objfile)
1948 struct objfile *objfile;
1950 register struct symtab *symtab;
1952 symtab = (struct symtab *)
1953 obstack_alloc (&objfile->symbol_obstack, sizeof (struct symtab));
1954 memset (symtab, 0, sizeof (*symtab));
1955 symtab->filename = obsavestring (filename, strlen (filename),
1956 &objfile->symbol_obstack);
1957 symtab->fullname = NULL;
1958 symtab->language = deduce_language_from_filename (filename);
1959 symtab->debugformat = obsavestring ("unknown", 7,
1960 &objfile->symbol_obstack);
1962 /* Hook it to the objfile it comes from */
1964 symtab->objfile = objfile;
1965 symtab->next = objfile->symtabs;
1966 objfile->symtabs = symtab;
1968 /* FIXME: This should go away. It is only defined for the Z8000,
1969 and the Z8000 definition of this macro doesn't have anything to
1970 do with the now-nonexistent EXTRA_SYMTAB_INFO macro, it's just
1971 here for convenience. */
1972 #ifdef INIT_EXTRA_SYMTAB_INFO
1973 INIT_EXTRA_SYMTAB_INFO (symtab);
1979 struct partial_symtab *
1980 allocate_psymtab (filename, objfile)
1982 struct objfile *objfile;
1984 struct partial_symtab *psymtab;
1986 if (objfile->free_psymtabs)
1988 psymtab = objfile->free_psymtabs;
1989 objfile->free_psymtabs = psymtab->next;
1992 psymtab = (struct partial_symtab *)
1993 obstack_alloc (&objfile->psymbol_obstack,
1994 sizeof (struct partial_symtab));
1996 memset (psymtab, 0, sizeof (struct partial_symtab));
1997 psymtab->filename = obsavestring (filename, strlen (filename),
1998 &objfile->psymbol_obstack);
1999 psymtab->symtab = NULL;
2001 /* Prepend it to the psymtab list for the objfile it belongs to.
2002 Psymtabs are searched in most recent inserted -> least recent
2005 psymtab->objfile = objfile;
2006 psymtab->next = objfile->psymtabs;
2007 objfile->psymtabs = psymtab;
2010 struct partial_symtab **prev_pst;
2011 psymtab->objfile = objfile;
2012 psymtab->next = NULL;
2013 prev_pst = &(objfile->psymtabs);
2014 while ((*prev_pst) != NULL)
2015 prev_pst = &((*prev_pst)->next);
2016 (*prev_pst) = psymtab;
2024 discard_psymtab (pst)
2025 struct partial_symtab *pst;
2027 struct partial_symtab **prev_pst;
2030 Empty psymtabs happen as a result of header files which don't
2031 have any symbols in them. There can be a lot of them. But this
2032 check is wrong, in that a psymtab with N_SLINE entries but
2033 nothing else is not empty, but we don't realize that. Fixing
2034 that without slowing things down might be tricky. */
2036 /* First, snip it out of the psymtab chain */
2038 prev_pst = &(pst->objfile->psymtabs);
2039 while ((*prev_pst) != pst)
2040 prev_pst = &((*prev_pst)->next);
2041 (*prev_pst) = pst->next;
2043 /* Next, put it on a free list for recycling */
2045 pst->next = pst->objfile->free_psymtabs;
2046 pst->objfile->free_psymtabs = pst;
2050 /* Reset all data structures in gdb which may contain references to symbol
2054 clear_symtab_users ()
2056 /* Someday, we should do better than this, by only blowing away
2057 the things that really need to be blown. */
2058 clear_value_history ();
2060 clear_internalvars ();
2061 breakpoint_re_set ();
2062 set_default_breakpoint (0, 0, 0, 0);
2063 current_source_symtab = 0;
2064 current_source_line = 0;
2065 clear_pc_function_cache ();
2066 target_new_objfile (NULL);
2069 /* clear_symtab_users_once:
2071 This function is run after symbol reading, or from a cleanup.
2072 If an old symbol table was obsoleted, the old symbol table
2073 has been blown away, but the other GDB data structures that may
2074 reference it have not yet been cleared or re-directed. (The old
2075 symtab was zapped, and the cleanup queued, in free_named_symtab()
2078 This function can be queued N times as a cleanup, or called
2079 directly; it will do all the work the first time, and then will be a
2080 no-op until the next time it is queued. This works by bumping a
2081 counter at queueing time. Much later when the cleanup is run, or at
2082 the end of symbol processing (in case the cleanup is discarded), if
2083 the queued count is greater than the "done-count", we do the work
2084 and set the done-count to the queued count. If the queued count is
2085 less than or equal to the done-count, we just ignore the call. This
2086 is needed because reading a single .o file will often replace many
2087 symtabs (one per .h file, for example), and we don't want to reset
2088 the breakpoints N times in the user's face.
2090 The reason we both queue a cleanup, and call it directly after symbol
2091 reading, is because the cleanup protects us in case of errors, but is
2092 discarded if symbol reading is successful. */
2095 /* FIXME: As free_named_symtabs is currently a big noop this function
2096 is no longer needed. */
2098 clear_symtab_users_once PARAMS ((void));
2100 static int clear_symtab_users_queued;
2101 static int clear_symtab_users_done;
2104 clear_symtab_users_once ()
2106 /* Enforce once-per-`do_cleanups'-semantics */
2107 if (clear_symtab_users_queued <= clear_symtab_users_done)
2109 clear_symtab_users_done = clear_symtab_users_queued;
2111 clear_symtab_users ();
2115 /* Delete the specified psymtab, and any others that reference it. */
2118 cashier_psymtab (pst)
2119 struct partial_symtab *pst;
2121 struct partial_symtab *ps, *pprev = NULL;
2124 /* Find its previous psymtab in the chain */
2125 for (ps = pst->objfile->psymtabs; ps; ps = ps->next)
2134 /* Unhook it from the chain. */
2135 if (ps == pst->objfile->psymtabs)
2136 pst->objfile->psymtabs = ps->next;
2138 pprev->next = ps->next;
2140 /* FIXME, we can't conveniently deallocate the entries in the
2141 partial_symbol lists (global_psymbols/static_psymbols) that
2142 this psymtab points to. These just take up space until all
2143 the psymtabs are reclaimed. Ditto the dependencies list and
2144 filename, which are all in the psymbol_obstack. */
2146 /* We need to cashier any psymtab that has this one as a dependency... */
2148 for (ps = pst->objfile->psymtabs; ps; ps = ps->next)
2150 for (i = 0; i < ps->number_of_dependencies; i++)
2152 if (ps->dependencies[i] == pst)
2154 cashier_psymtab (ps);
2155 goto again; /* Must restart, chain has been munged. */
2162 /* If a symtab or psymtab for filename NAME is found, free it along
2163 with any dependent breakpoints, displays, etc.
2164 Used when loading new versions of object modules with the "add-file"
2165 command. This is only called on the top-level symtab or psymtab's name;
2166 it is not called for subsidiary files such as .h files.
2168 Return value is 1 if we blew away the environment, 0 if not.
2169 FIXME. The return valu appears to never be used.
2171 FIXME. I think this is not the best way to do this. We should
2172 work on being gentler to the environment while still cleaning up
2173 all stray pointers into the freed symtab. */
2176 free_named_symtabs (name)
2180 /* FIXME: With the new method of each objfile having it's own
2181 psymtab list, this function needs serious rethinking. In particular,
2182 why was it ever necessary to toss psymtabs with specific compilation
2183 unit filenames, as opposed to all psymtabs from a particular symbol
2185 Well, the answer is that some systems permit reloading of particular
2186 compilation units. We want to blow away any old info about these
2187 compilation units, regardless of which objfiles they arrived in. --gnu. */
2189 register struct symtab *s;
2190 register struct symtab *prev;
2191 register struct partial_symtab *ps;
2192 struct blockvector *bv;
2195 /* We only wack things if the symbol-reload switch is set. */
2196 if (!symbol_reloading)
2199 /* Some symbol formats have trouble providing file names... */
2200 if (name == 0 || *name == '\0')
2203 /* Look for a psymtab with the specified name. */
2206 for (ps = partial_symtab_list; ps; ps = ps->next)
2208 if (STREQ (name, ps->filename))
2210 cashier_psymtab (ps); /* Blow it away...and its little dog, too. */
2211 goto again2; /* Must restart, chain has been munged */
2215 /* Look for a symtab with the specified name. */
2217 for (s = symtab_list; s; s = s->next)
2219 if (STREQ (name, s->filename))
2226 if (s == symtab_list)
2227 symtab_list = s->next;
2229 prev->next = s->next;
2231 /* For now, queue a delete for all breakpoints, displays, etc., whether
2232 or not they depend on the symtab being freed. This should be
2233 changed so that only those data structures affected are deleted. */
2235 /* But don't delete anything if the symtab is empty.
2236 This test is necessary due to a bug in "dbxread.c" that
2237 causes empty symtabs to be created for N_SO symbols that
2238 contain the pathname of the object file. (This problem
2239 has been fixed in GDB 3.9x). */
2241 bv = BLOCKVECTOR (s);
2242 if (BLOCKVECTOR_NBLOCKS (bv) > 2
2243 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
2244 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)))
2246 complain (&oldsyms_complaint, name);
2248 clear_symtab_users_queued++;
2249 make_cleanup (clear_symtab_users_once, 0);
2254 complain (&empty_symtab_complaint, name);
2261 /* It is still possible that some breakpoints will be affected
2262 even though no symtab was found, since the file might have
2263 been compiled without debugging, and hence not be associated
2264 with a symtab. In order to handle this correctly, we would need
2265 to keep a list of text address ranges for undebuggable files.
2266 For now, we do nothing, since this is a fairly obscure case. */
2270 /* FIXME, what about the minimal symbol table? */
2277 /* Allocate and partially fill a partial symtab. It will be
2278 completely filled at the end of the symbol list.
2280 FILENAME is the name of the symbol-file we are reading from. */
2282 struct partial_symtab *
2283 start_psymtab_common (objfile, section_offsets,
2284 filename, textlow, global_syms, static_syms)
2285 struct objfile *objfile;
2286 struct section_offsets *section_offsets;
2289 struct partial_symbol **global_syms;
2290 struct partial_symbol **static_syms;
2292 struct partial_symtab *psymtab;
2294 psymtab = allocate_psymtab (filename, objfile);
2295 psymtab->section_offsets = section_offsets;
2296 psymtab->textlow = textlow;
2297 psymtab->texthigh = psymtab->textlow; /* default */
2298 psymtab->globals_offset = global_syms - objfile->global_psymbols.list;
2299 psymtab->statics_offset = static_syms - objfile->static_psymbols.list;
2303 /* Add a symbol with a long value to a psymtab.
2304 Since one arg is a struct, we pass in a ptr and deref it (sigh). */
2307 add_psymbol_to_list (name, namelength, namespace, class, list, val, coreaddr,
2311 namespace_enum namespace;
2312 enum address_class class;
2313 struct psymbol_allocation_list *list;
2314 long val; /* Value as a long */
2315 CORE_ADDR coreaddr; /* Value as a CORE_ADDR */
2316 enum language language;
2317 struct objfile *objfile;
2319 register struct partial_symbol *psym;
2320 char *buf = alloca (namelength + 1);
2321 /* psymbol is static so that there will be no uninitialized gaps in the
2322 structure which might contain random data, causing cache misses in
2324 static struct partial_symbol psymbol;
2326 /* Create local copy of the partial symbol */
2327 memcpy (buf, name, namelength);
2328 buf[namelength] = '\0';
2329 SYMBOL_NAME (&psymbol) = bcache (buf, namelength + 1, &objfile->psymbol_cache);
2330 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2333 SYMBOL_VALUE (&psymbol) = val;
2337 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2339 SYMBOL_SECTION (&psymbol) = 0;
2340 SYMBOL_LANGUAGE (&psymbol) = language;
2341 PSYMBOL_NAMESPACE (&psymbol) = namespace;
2342 PSYMBOL_CLASS (&psymbol) = class;
2343 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2345 /* Stash the partial symbol away in the cache */
2346 psym = bcache (&psymbol, sizeof (struct partial_symbol), &objfile->psymbol_cache);
2348 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2349 if (list->next >= list->list + list->size)
2351 extend_psymbol_list (list, objfile);
2353 *list->next++ = psym;
2354 OBJSTAT (objfile, n_psyms++);
2357 /* Add a symbol with a long value to a psymtab. This differs from
2358 * add_psymbol_to_list above in taking both a mangled and a demangled
2362 add_psymbol_with_dem_name_to_list (name, namelength, dem_name, dem_namelength,
2363 namespace, class, list, val, coreaddr, language, objfile)
2368 namespace_enum namespace;
2369 enum address_class class;
2370 struct psymbol_allocation_list *list;
2371 long val; /* Value as a long */
2372 CORE_ADDR coreaddr; /* Value as a CORE_ADDR */
2373 enum language language;
2374 struct objfile *objfile;
2376 register struct partial_symbol *psym;
2377 char *buf = alloca (namelength + 1);
2378 /* psymbol is static so that there will be no uninitialized gaps in the
2379 structure which might contain random data, causing cache misses in
2381 static struct partial_symbol psymbol;
2383 /* Create local copy of the partial symbol */
2385 memcpy (buf, name, namelength);
2386 buf[namelength] = '\0';
2387 SYMBOL_NAME (&psymbol) = bcache (buf, namelength + 1, &objfile->psymbol_cache);
2389 buf = alloca (dem_namelength + 1);
2390 memcpy (buf, dem_name, dem_namelength);
2391 buf[dem_namelength] = '\0';
2396 case language_cplus:
2397 SYMBOL_CPLUS_DEMANGLED_NAME (&psymbol) =
2398 bcache (buf, dem_namelength + 1, &objfile->psymbol_cache);
2400 case language_chill:
2401 SYMBOL_CHILL_DEMANGLED_NAME (&psymbol) =
2402 bcache (buf, dem_namelength + 1, &objfile->psymbol_cache);
2404 /* FIXME What should be done for the default case? Ignoring for now. */
2407 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2410 SYMBOL_VALUE (&psymbol) = val;
2414 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2416 SYMBOL_SECTION (&psymbol) = 0;
2417 SYMBOL_LANGUAGE (&psymbol) = language;
2418 PSYMBOL_NAMESPACE (&psymbol) = namespace;
2419 PSYMBOL_CLASS (&psymbol) = class;
2420 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2422 /* Stash the partial symbol away in the cache */
2423 psym = bcache (&psymbol, sizeof (struct partial_symbol), &objfile->psymbol_cache);
2425 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2426 if (list->next >= list->list + list->size)
2428 extend_psymbol_list (list, objfile);
2430 *list->next++ = psym;
2431 OBJSTAT (objfile, n_psyms++);
2434 /* Initialize storage for partial symbols. */
2437 init_psymbol_list (objfile, total_symbols)
2438 struct objfile *objfile;
2441 /* Free any previously allocated psymbol lists. */
2443 if (objfile->global_psymbols.list)
2445 mfree (objfile->md, (PTR) objfile->global_psymbols.list);
2447 if (objfile->static_psymbols.list)
2449 mfree (objfile->md, (PTR) objfile->static_psymbols.list);
2452 /* Current best guess is that approximately a twentieth
2453 of the total symbols (in a debugging file) are global or static
2456 objfile->global_psymbols.size = total_symbols / 10;
2457 objfile->static_psymbols.size = total_symbols / 10;
2459 if (objfile->global_psymbols.size > 0)
2461 objfile->global_psymbols.next =
2462 objfile->global_psymbols.list = (struct partial_symbol **)
2463 xmmalloc (objfile->md, (objfile->global_psymbols.size
2464 * sizeof (struct partial_symbol *)));
2466 if (objfile->static_psymbols.size > 0)
2468 objfile->static_psymbols.next =
2469 objfile->static_psymbols.list = (struct partial_symbol **)
2470 xmmalloc (objfile->md, (objfile->static_psymbols.size
2471 * sizeof (struct partial_symbol *)));
2476 The following code implements an abstraction for debugging overlay sections.
2478 The target model is as follows:
2479 1) The gnu linker will permit multiple sections to be mapped into the
2480 same VMA, each with its own unique LMA (or load address).
2481 2) It is assumed that some runtime mechanism exists for mapping the
2482 sections, one by one, from the load address into the VMA address.
2483 3) This code provides a mechanism for gdb to keep track of which
2484 sections should be considered to be mapped from the VMA to the LMA.
2485 This information is used for symbol lookup, and memory read/write.
2486 For instance, if a section has been mapped then its contents
2487 should be read from the VMA, otherwise from the LMA.
2489 Two levels of debugger support for overlays are available. One is
2490 "manual", in which the debugger relies on the user to tell it which
2491 overlays are currently mapped. This level of support is
2492 implemented entirely in the core debugger, and the information about
2493 whether a section is mapped is kept in the objfile->obj_section table.
2495 The second level of support is "automatic", and is only available if
2496 the target-specific code provides functionality to read the target's
2497 overlay mapping table, and translate its contents for the debugger
2498 (by updating the mapped state information in the obj_section tables).
2500 The interface is as follows:
2502 overlay map <name> -- tell gdb to consider this section mapped
2503 overlay unmap <name> -- tell gdb to consider this section unmapped
2504 overlay list -- list the sections that GDB thinks are mapped
2505 overlay read-target -- get the target's state of what's mapped
2506 overlay off/manual/auto -- set overlay debugging state
2507 Functional interface:
2508 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2509 section, return that section.
2510 find_pc_overlay(pc): find any overlay section that contains
2511 the pc, either in its VMA or its LMA
2512 overlay_is_mapped(sect): true if overlay is marked as mapped
2513 section_is_overlay(sect): true if section's VMA != LMA
2514 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2515 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2516 overlay_mapped_address(...): map an address from section's LMA to VMA
2517 overlay_unmapped_address(...): map an address from section's VMA to LMA
2518 symbol_overlayed_address(...): Return a "current" address for symbol:
2519 either in VMA or LMA depending on whether
2520 the symbol's section is currently mapped
2523 /* Overlay debugging state: */
2525 int overlay_debugging = 0; /* 0 == off, 1 == manual, -1 == auto */
2526 int overlay_cache_invalid = 0; /* True if need to refresh mapped state */
2528 /* Target vector for refreshing overlay mapped state */
2529 static void simple_overlay_update PARAMS ((struct obj_section *));
2530 void (*target_overlay_update) PARAMS ((struct obj_section *))
2531 = simple_overlay_update;
2533 /* Function: section_is_overlay (SECTION)
2534 Returns true if SECTION has VMA not equal to LMA, ie.
2535 SECTION is loaded at an address different from where it will "run". */
2538 section_is_overlay (section)
2541 if (overlay_debugging)
2542 if (section && section->lma != 0 &&
2543 section->vma != section->lma)
2549 /* Function: overlay_invalidate_all (void)
2550 Invalidate the mapped state of all overlay sections (mark it as stale). */
2553 overlay_invalidate_all ()
2555 struct objfile *objfile;
2556 struct obj_section *sect;
2558 ALL_OBJSECTIONS (objfile, sect)
2559 if (section_is_overlay (sect->the_bfd_section))
2560 sect->ovly_mapped = -1;
2563 /* Function: overlay_is_mapped (SECTION)
2564 Returns true if section is an overlay, and is currently mapped.
2565 Private: public access is thru function section_is_mapped.
2567 Access to the ovly_mapped flag is restricted to this function, so
2568 that we can do automatic update. If the global flag
2569 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2570 overlay_invalidate_all. If the mapped state of the particular
2571 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2574 overlay_is_mapped (osect)
2575 struct obj_section *osect;
2577 if (osect == 0 || !section_is_overlay (osect->the_bfd_section))
2580 switch (overlay_debugging)
2584 return 0; /* overlay debugging off */
2585 case -1: /* overlay debugging automatic */
2586 /* Unles there is a target_overlay_update function,
2587 there's really nothing useful to do here (can't really go auto) */
2588 if (target_overlay_update)
2590 if (overlay_cache_invalid)
2592 overlay_invalidate_all ();
2593 overlay_cache_invalid = 0;
2595 if (osect->ovly_mapped == -1)
2596 (*target_overlay_update) (osect);
2598 /* fall thru to manual case */
2599 case 1: /* overlay debugging manual */
2600 return osect->ovly_mapped == 1;
2604 /* Function: section_is_mapped
2605 Returns true if section is an overlay, and is currently mapped. */
2608 section_is_mapped (section)
2611 struct objfile *objfile;
2612 struct obj_section *osect;
2614 if (overlay_debugging)
2615 if (section && section_is_overlay (section))
2616 ALL_OBJSECTIONS (objfile, osect)
2617 if (osect->the_bfd_section == section)
2618 return overlay_is_mapped (osect);
2623 /* Function: pc_in_unmapped_range
2624 If PC falls into the lma range of SECTION, return true, else false. */
2627 pc_in_unmapped_range (pc, section)
2633 if (overlay_debugging)
2634 if (section && section_is_overlay (section))
2636 size = bfd_get_section_size_before_reloc (section);
2637 if (section->lma <= pc && pc < section->lma + size)
2643 /* Function: pc_in_mapped_range
2644 If PC falls into the vma range of SECTION, return true, else false. */
2647 pc_in_mapped_range (pc, section)
2653 if (overlay_debugging)
2654 if (section && section_is_overlay (section))
2656 size = bfd_get_section_size_before_reloc (section);
2657 if (section->vma <= pc && pc < section->vma + size)
2663 /* Function: overlay_unmapped_address (PC, SECTION)
2664 Returns the address corresponding to PC in the unmapped (load) range.
2665 May be the same as PC. */
2668 overlay_unmapped_address (pc, section)
2672 if (overlay_debugging)
2673 if (section && section_is_overlay (section) &&
2674 pc_in_mapped_range (pc, section))
2675 return pc + section->lma - section->vma;
2680 /* Function: overlay_mapped_address (PC, SECTION)
2681 Returns the address corresponding to PC in the mapped (runtime) range.
2682 May be the same as PC. */
2685 overlay_mapped_address (pc, section)
2689 if (overlay_debugging)
2690 if (section && section_is_overlay (section) &&
2691 pc_in_unmapped_range (pc, section))
2692 return pc + section->vma - section->lma;
2698 /* Function: symbol_overlayed_address
2699 Return one of two addresses (relative to the VMA or to the LMA),
2700 depending on whether the section is mapped or not. */
2703 symbol_overlayed_address (address, section)
2707 if (overlay_debugging)
2709 /* If the symbol has no section, just return its regular address. */
2712 /* If the symbol's section is not an overlay, just return its address */
2713 if (!section_is_overlay (section))
2715 /* If the symbol's section is mapped, just return its address */
2716 if (section_is_mapped (section))
2719 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
2720 * then return its LOADED address rather than its vma address!!
2722 return overlay_unmapped_address (address, section);
2727 /* Function: find_pc_overlay (PC)
2728 Return the best-match overlay section for PC:
2729 If PC matches a mapped overlay section's VMA, return that section.
2730 Else if PC matches an unmapped section's VMA, return that section.
2731 Else if PC matches an unmapped section's LMA, return that section. */
2734 find_pc_overlay (pc)
2737 struct objfile *objfile;
2738 struct obj_section *osect, *best_match = NULL;
2740 if (overlay_debugging)
2741 ALL_OBJSECTIONS (objfile, osect)
2742 if (section_is_overlay (osect->the_bfd_section))
2744 if (pc_in_mapped_range (pc, osect->the_bfd_section))
2746 if (overlay_is_mapped (osect))
2747 return osect->the_bfd_section;
2751 else if (pc_in_unmapped_range (pc, osect->the_bfd_section))
2754 return best_match ? best_match->the_bfd_section : NULL;
2757 /* Function: find_pc_mapped_section (PC)
2758 If PC falls into the VMA address range of an overlay section that is
2759 currently marked as MAPPED, return that section. Else return NULL. */
2762 find_pc_mapped_section (pc)
2765 struct objfile *objfile;
2766 struct obj_section *osect;
2768 if (overlay_debugging)
2769 ALL_OBJSECTIONS (objfile, osect)
2770 if (pc_in_mapped_range (pc, osect->the_bfd_section) &&
2771 overlay_is_mapped (osect))
2772 return osect->the_bfd_section;
2777 /* Function: list_overlays_command
2778 Print a list of mapped sections and their PC ranges */
2781 list_overlays_command (args, from_tty)
2786 struct objfile *objfile;
2787 struct obj_section *osect;
2789 if (overlay_debugging)
2790 ALL_OBJSECTIONS (objfile, osect)
2791 if (overlay_is_mapped (osect))
2797 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
2798 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
2799 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2800 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
2802 printf_filtered ("Section %s, loaded at ", name);
2803 print_address_numeric (lma, 1, gdb_stdout);
2804 puts_filtered (" - ");
2805 print_address_numeric (lma + size, 1, gdb_stdout);
2806 printf_filtered (", mapped at ");
2807 print_address_numeric (vma, 1, gdb_stdout);
2808 puts_filtered (" - ");
2809 print_address_numeric (vma + size, 1, gdb_stdout);
2810 puts_filtered ("\n");
2815 printf_filtered ("No sections are mapped.\n");
2818 /* Function: map_overlay_command
2819 Mark the named section as mapped (ie. residing at its VMA address). */
2822 map_overlay_command (args, from_tty)
2826 struct objfile *objfile, *objfile2;
2827 struct obj_section *sec, *sec2;
2830 if (!overlay_debugging)
2831 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2833 if (args == 0 || *args == 0)
2834 error ("Argument required: name of an overlay section");
2836 /* First, find a section matching the user supplied argument */
2837 ALL_OBJSECTIONS (objfile, sec)
2838 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
2840 /* Now, check to see if the section is an overlay. */
2841 bfdsec = sec->the_bfd_section;
2842 if (!section_is_overlay (bfdsec))
2843 continue; /* not an overlay section */
2845 /* Mark the overlay as "mapped" */
2846 sec->ovly_mapped = 1;
2848 /* Next, make a pass and unmap any sections that are
2849 overlapped by this new section: */
2850 ALL_OBJSECTIONS (objfile2, sec2)
2851 if (sec2->ovly_mapped &&
2853 sec->the_bfd_section != sec2->the_bfd_section &&
2854 (pc_in_mapped_range (sec2->addr, sec->the_bfd_section) ||
2855 pc_in_mapped_range (sec2->endaddr, sec->the_bfd_section)))
2858 printf_filtered ("Note: section %s unmapped by overlap\n",
2859 bfd_section_name (objfile->obfd,
2860 sec2->the_bfd_section));
2861 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2 */
2865 error ("No overlay section called %s", args);
2868 /* Function: unmap_overlay_command
2869 Mark the overlay section as unmapped
2870 (ie. resident in its LMA address range, rather than the VMA range). */
2873 unmap_overlay_command (args, from_tty)
2877 struct objfile *objfile;
2878 struct obj_section *sec;
2880 if (!overlay_debugging)
2881 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2883 if (args == 0 || *args == 0)
2884 error ("Argument required: name of an overlay section");
2886 /* First, find a section matching the user supplied argument */
2887 ALL_OBJSECTIONS (objfile, sec)
2888 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
2890 if (!sec->ovly_mapped)
2891 error ("Section %s is not mapped", args);
2892 sec->ovly_mapped = 0;
2895 error ("No overlay section called %s", args);
2898 /* Function: overlay_auto_command
2899 A utility command to turn on overlay debugging.
2900 Possibly this should be done via a set/show command. */
2903 overlay_auto_command (args, from_tty)
2907 overlay_debugging = -1;
2909 printf_filtered ("Automatic overlay debugging enabled.");
2912 /* Function: overlay_manual_command
2913 A utility command to turn on overlay debugging.
2914 Possibly this should be done via a set/show command. */
2917 overlay_manual_command (args, from_tty)
2921 overlay_debugging = 1;
2923 printf_filtered ("Overlay debugging enabled.");
2926 /* Function: overlay_off_command
2927 A utility command to turn on overlay debugging.
2928 Possibly this should be done via a set/show command. */
2931 overlay_off_command (args, from_tty)
2935 overlay_debugging = 0;
2937 printf_filtered ("Overlay debugging disabled.");
2941 overlay_load_command (args, from_tty)
2945 if (target_overlay_update)
2946 (*target_overlay_update) (NULL);
2948 error ("This target does not know how to read its overlay state.");
2951 /* Function: overlay_command
2952 A place-holder for a mis-typed command */
2954 /* Command list chain containing all defined "overlay" subcommands. */
2955 struct cmd_list_element *overlaylist;
2958 overlay_command (args, from_tty)
2963 ("\"overlay\" must be followed by the name of an overlay command.\n");
2964 help_list (overlaylist, "overlay ", -1, gdb_stdout);
2968 /* Target Overlays for the "Simplest" overlay manager:
2970 This is GDB's default target overlay layer. It works with the
2971 minimal overlay manager supplied as an example by Cygnus. The
2972 entry point is via a function pointer "target_overlay_update",
2973 so targets that use a different runtime overlay manager can
2974 substitute their own overlay_update function and take over the
2977 The overlay_update function pokes around in the target's data structures
2978 to see what overlays are mapped, and updates GDB's overlay mapping with
2981 In this simple implementation, the target data structures are as follows:
2982 unsigned _novlys; /# number of overlay sections #/
2983 unsigned _ovly_table[_novlys][4] = {
2984 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
2985 {..., ..., ..., ...},
2987 unsigned _novly_regions; /# number of overlay regions #/
2988 unsigned _ovly_region_table[_novly_regions][3] = {
2989 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
2992 These functions will attempt to update GDB's mappedness state in the
2993 symbol section table, based on the target's mappedness state.
2995 To do this, we keep a cached copy of the target's _ovly_table, and
2996 attempt to detect when the cached copy is invalidated. The main
2997 entry point is "simple_overlay_update(SECT), which looks up SECT in
2998 the cached table and re-reads only the entry for that section from
2999 the target (whenever possible).
3002 /* Cached, dynamically allocated copies of the target data structures: */
3003 static unsigned (*cache_ovly_table)[4] = 0;
3005 static unsigned (*cache_ovly_region_table)[3] = 0;
3007 static unsigned cache_novlys = 0;
3009 static unsigned cache_novly_regions = 0;
3011 static CORE_ADDR cache_ovly_table_base = 0;
3013 static CORE_ADDR cache_ovly_region_table_base = 0;
3017 VMA, SIZE, LMA, MAPPED
3019 #define TARGET_LONG_BYTES (TARGET_LONG_BIT / TARGET_CHAR_BIT)
3021 /* Throw away the cached copy of _ovly_table */
3023 simple_free_overlay_table ()
3025 if (cache_ovly_table)
3026 free (cache_ovly_table);
3028 cache_ovly_table = NULL;
3029 cache_ovly_table_base = 0;
3033 /* Throw away the cached copy of _ovly_region_table */
3035 simple_free_overlay_region_table ()
3037 if (cache_ovly_region_table)
3038 free (cache_ovly_region_table);
3039 cache_novly_regions = 0;
3040 cache_ovly_region_table = NULL;
3041 cache_ovly_region_table_base = 0;
3045 /* Read an array of ints from the target into a local buffer.
3046 Convert to host order. int LEN is number of ints */
3048 read_target_long_array (memaddr, myaddr, len)
3050 unsigned int *myaddr;
3053 char *buf = alloca (len * TARGET_LONG_BYTES);
3056 read_memory (memaddr, buf, len * TARGET_LONG_BYTES);
3057 for (i = 0; i < len; i++)
3058 myaddr[i] = extract_unsigned_integer (TARGET_LONG_BYTES * i + buf,
3062 /* Find and grab a copy of the target _ovly_table
3063 (and _novlys, which is needed for the table's size) */
3065 simple_read_overlay_table ()
3067 struct minimal_symbol *msym;
3069 simple_free_overlay_table ();
3070 msym = lookup_minimal_symbol ("_novlys", 0, 0);
3072 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
3074 return 0; /* failure */
3075 cache_ovly_table = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
3076 if (cache_ovly_table != NULL)
3078 msym = lookup_minimal_symbol ("_ovly_table", 0, 0);
3081 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (msym);
3082 read_target_long_array (cache_ovly_table_base,
3083 (int *) cache_ovly_table,
3087 return 0; /* failure */
3090 return 0; /* failure */
3091 return 1; /* SUCCESS */
3095 /* Find and grab a copy of the target _ovly_region_table
3096 (and _novly_regions, which is needed for the table's size) */
3098 simple_read_overlay_region_table ()
3100 struct minimal_symbol *msym;
3102 simple_free_overlay_region_table ();
3103 msym = lookup_minimal_symbol ("_novly_regions", 0, 0);
3105 cache_novly_regions = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
3107 return 0; /* failure */
3108 cache_ovly_region_table = (void *) xmalloc (cache_novly_regions * 12);
3109 if (cache_ovly_region_table != NULL)
3111 msym = lookup_minimal_symbol ("_ovly_region_table", 0, 0);
3114 cache_ovly_region_table_base = SYMBOL_VALUE_ADDRESS (msym);
3115 read_target_long_array (cache_ovly_region_table_base,
3116 (int *) cache_ovly_region_table,
3117 cache_novly_regions * 3);
3120 return 0; /* failure */
3123 return 0; /* failure */
3124 return 1; /* SUCCESS */
3128 /* Function: simple_overlay_update_1
3129 A helper function for simple_overlay_update. Assuming a cached copy
3130 of _ovly_table exists, look through it to find an entry whose vma,
3131 lma and size match those of OSECT. Re-read the entry and make sure
3132 it still matches OSECT (else the table may no longer be valid).
3133 Set OSECT's mapped state to match the entry. Return: 1 for
3134 success, 0 for failure. */
3137 simple_overlay_update_1 (osect)
3138 struct obj_section *osect;
3142 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
3143 for (i = 0; i < cache_novlys; i++)
3144 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
3145 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
3146 cache_ovly_table[i][SIZE] == size */ )
3148 read_target_long_array (cache_ovly_table_base + i * TARGET_LONG_BYTES,
3149 (int *) cache_ovly_table[i], 4);
3150 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
3151 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
3152 cache_ovly_table[i][SIZE] == size */ )
3154 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3157 else /* Warning! Warning! Target's ovly table has changed! */
3163 /* Function: simple_overlay_update
3164 If OSECT is NULL, then update all sections' mapped state
3165 (after re-reading the entire target _ovly_table).
3166 If OSECT is non-NULL, then try to find a matching entry in the
3167 cached ovly_table and update only OSECT's mapped state.
3168 If a cached entry can't be found or the cache isn't valid, then
3169 re-read the entire cache, and go ahead and update all sections. */
3172 simple_overlay_update (osect)
3173 struct obj_section *osect;
3175 struct objfile *objfile;
3177 /* Were we given an osect to look up? NULL means do all of them. */
3179 /* Have we got a cached copy of the target's overlay table? */
3180 if (cache_ovly_table != NULL)
3181 /* Does its cached location match what's currently in the symtab? */
3182 if (cache_ovly_table_base ==
3183 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", 0, 0)))
3184 /* Then go ahead and try to look up this single section in the cache */
3185 if (simple_overlay_update_1 (osect))
3186 /* Found it! We're done. */
3189 /* Cached table no good: need to read the entire table anew.
3190 Or else we want all the sections, in which case it's actually
3191 more efficient to read the whole table in one block anyway. */
3193 if (simple_read_overlay_table () == 0) /* read failed? No table? */
3195 warning ("Failed to read the target overlay mapping table.");
3198 /* Now may as well update all sections, even if only one was requested. */
3199 ALL_OBJSECTIONS (objfile, osect)
3200 if (section_is_overlay (osect->the_bfd_section))
3204 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
3205 for (i = 0; i < cache_novlys; i++)
3206 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
3207 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
3208 cache_ovly_table[i][SIZE] == size */ )
3209 { /* obj_section matches i'th entry in ovly_table */
3210 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
3211 break; /* finished with inner for loop: break out */
3218 _initialize_symfile ()
3220 struct cmd_list_element *c;
3222 c = add_cmd ("symbol-file", class_files, symbol_file_command,
3223 "Load symbol table from executable file FILE.\n\
3224 The `file' command can also load symbol tables, as well as setting the file\n\
3225 to execute.", &cmdlist);
3226 c->completer = filename_completer;
3228 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command,
3229 "Usage: add-symbol-file FILE ADDR [DATA_ADDR [BSS_ADDR]]\n\
3230 or: add-symbol-file FILE -T<SECT> <SECT_ADDR> -T<SECT> <SECT_ADDR> ...\n\
3231 Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
3232 ADDR is the starting address of the file's text.\n\
3233 The optional arguments, DATA_ADDR and BSS_ADDR, should be specified\n\
3234 if the data and bss segments are not contiguous with the text.\n\
3235 For complicated cases, SECT is a section name to be loaded at SECT_ADDR.",
3237 c->completer = filename_completer;
3239 c = add_cmd ("add-shared-symbol-files", class_files,
3240 add_shared_symbol_files_command,
3241 "Load the symbols from shared objects in the dynamic linker's link map.",
3243 c = add_alias_cmd ("assf", "add-shared-symbol-files", class_files, 1,
3246 c = add_cmd ("load", class_files, load_command,
3247 "Dynamically load FILE into the running program, and record its symbols\n\
3248 for access from GDB.", &cmdlist);
3249 c->completer = filename_completer;
3252 (add_set_cmd ("symbol-reloading", class_support, var_boolean,
3253 (char *) &symbol_reloading,
3254 "Set dynamic symbol table reloading multiple times in one run.",
3258 add_prefix_cmd ("overlay", class_support, overlay_command,
3259 "Commands for debugging overlays.", &overlaylist,
3260 "overlay ", 0, &cmdlist);
3262 add_com_alias ("ovly", "overlay", class_alias, 1);
3263 add_com_alias ("ov", "overlay", class_alias, 1);
3265 add_cmd ("map-overlay", class_support, map_overlay_command,
3266 "Assert that an overlay section is mapped.", &overlaylist);
3268 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
3269 "Assert that an overlay section is unmapped.", &overlaylist);
3271 add_cmd ("list-overlays", class_support, list_overlays_command,
3272 "List mappings of overlay sections.", &overlaylist);
3274 add_cmd ("manual", class_support, overlay_manual_command,
3275 "Enable overlay debugging.", &overlaylist);
3276 add_cmd ("off", class_support, overlay_off_command,
3277 "Disable overlay debugging.", &overlaylist);
3278 add_cmd ("auto", class_support, overlay_auto_command,
3279 "Enable automatic overlay debugging.", &overlaylist);
3280 add_cmd ("load-target", class_support, overlay_load_command,
3281 "Read the overlay mapping state from the target.", &overlaylist);
3283 /* Filename extension to source language lookup table: */
3284 init_filename_language_table ();
3285 c = add_set_cmd ("extension-language", class_files, var_string_noescape,
3287 "Set mapping between filename extension and source language.\n\
3288 Usage: set extension-language .foo bar",
3290 c->function.cfunc = set_ext_lang_command;
3292 add_info ("extensions", info_ext_lang_command,
3293 "All filename extensions associated with a source language.");