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"
58 /* Some HP-UX related globals to clear when a new "main"
59 symbol file is loaded. HP-specific. */
61 extern int hp_som_som_object_present;
62 extern int hp_cxx_exception_support_initialized;
63 #define RESET_HP_UX_GLOBALS() do {\
64 hp_som_som_object_present = 0; /* indicates HP-compiled code */ \
65 hp_cxx_exception_support_initialized = 0; /* must reinitialize exception stuff */ \
69 int (*ui_load_progress_hook) PARAMS ((char *, unsigned long));
70 void (*pre_add_symbol_hook) PARAMS ((char *));
71 void (*post_add_symbol_hook) PARAMS ((void));
73 /* Global variables owned by this file */
74 int readnow_symbol_files; /* Read full symbols immediately */
76 struct complaint oldsyms_complaint =
78 "Replacing old symbols for `%s'", 0, 0
81 struct complaint empty_symtab_complaint =
83 "Empty symbol table found for `%s'", 0, 0
86 /* External variables and functions referenced. */
88 extern int info_verbose;
90 extern void report_transfer_performance PARAMS ((unsigned long,
93 /* Functions this file defines */
96 static int simple_read_overlay_region_table PARAMS ((void));
97 static void simple_free_overlay_region_table PARAMS ((void));
100 static void set_initial_language PARAMS ((void));
102 static void load_command PARAMS ((char *, int));
104 static void add_symbol_file_command PARAMS ((char *, int));
106 static void add_shared_symbol_files_command PARAMS ((char *, int));
108 static void cashier_psymtab PARAMS ((struct partial_symtab *));
110 static int compare_psymbols PARAMS ((const void *, const void *));
112 static int compare_symbols PARAMS ((const void *, const void *));
114 bfd *symfile_bfd_open PARAMS ((char *));
116 static void find_sym_fns PARAMS ((struct objfile *));
118 static void decrement_reading_symtab PARAMS ((void *));
120 static void overlay_invalidate_all PARAMS ((void));
122 static int overlay_is_mapped PARAMS ((struct obj_section *));
124 void list_overlays_command PARAMS ((char *, int));
126 void map_overlay_command PARAMS ((char *, int));
128 void unmap_overlay_command PARAMS ((char *, int));
130 static void overlay_auto_command PARAMS ((char *, int));
132 static void overlay_manual_command PARAMS ((char *, int));
134 static void overlay_off_command PARAMS ((char *, int));
136 static void overlay_load_command PARAMS ((char *, int));
138 static void overlay_command PARAMS ((char *, int));
140 static void simple_free_overlay_table PARAMS ((void));
142 static void read_target_long_array PARAMS ((CORE_ADDR, unsigned int *, int));
144 static int simple_read_overlay_table PARAMS ((void));
146 static int simple_overlay_update_1 PARAMS ((struct obj_section *));
148 static void add_filename_language PARAMS ((char *ext, enum language lang));
150 static void set_ext_lang_command PARAMS ((char *args, int from_tty));
152 static void info_ext_lang_command PARAMS ((char *args, int from_tty));
154 static void init_filename_language_table PARAMS ((void));
156 void _initialize_symfile PARAMS ((void));
158 /* List of all available sym_fns. On gdb startup, each object file reader
159 calls add_symtab_fns() to register information on each format it is
162 static struct sym_fns *symtab_fns = NULL;
164 /* Flag for whether user will be reloading symbols multiple times.
165 Defaults to ON for VxWorks, otherwise OFF. */
167 #ifdef SYMBOL_RELOADING_DEFAULT
168 int symbol_reloading = SYMBOL_RELOADING_DEFAULT;
170 int symbol_reloading = 0;
173 /* If non-zero, then on HP-UX (i.e., platforms that use somsolib.c),
174 this variable is interpreted as a threshhold. If adding a new
175 library's symbol table to those already known to the debugger would
176 exceed this threshhold, then the shlib's symbols are not added.
178 If non-zero on other platforms, shared library symbols will be added
179 automatically when the inferior is created, new libraries are loaded,
180 or when attaching to the inferior. This is almost always what users
181 will want to have happen; but for very large programs, the startup
182 time will be excessive, and so if this is a problem, the user can
183 clear this flag and then add the shared library symbols as needed.
184 Note that there is a potential for confusion, since if the shared
185 library symbols are not loaded, commands like "info fun" will *not*
186 report all the functions that are actually present.
188 Note that HP-UX interprets this variable to mean, "threshhold size
189 in megabytes, where zero means never add". Other platforms interpret
190 this variable to mean, "always add if non-zero, never add if zero."
193 int auto_solib_add = 1;
196 /* Since this function is called from within qsort, in an ANSI environment
197 it must conform to the prototype for qsort, which specifies that the
198 comparison function takes two "void *" pointers. */
201 compare_symbols (s1p, s2p)
205 register struct symbol **s1, **s2;
207 s1 = (struct symbol **) s1p;
208 s2 = (struct symbol **) s2p;
210 return (STRCMP (SYMBOL_NAME (*s1), SYMBOL_NAME (*s2)));
217 compare_psymbols -- compare two partial symbols by name
221 Given pointers to pointers to two partial symbol table entries,
222 compare them by name and return -N, 0, or +N (ala strcmp).
223 Typically used by sorting routines like qsort().
227 Does direct compare of first two characters before punting
228 and passing to strcmp for longer compares. Note that the
229 original version had a bug whereby two null strings or two
230 identically named one character strings would return the
231 comparison of memory following the null byte.
236 compare_psymbols (s1p, s2p)
240 register char *st1 = SYMBOL_NAME (*(struct partial_symbol **) s1p);
241 register char *st2 = SYMBOL_NAME (*(struct partial_symbol **) s2p);
243 if ((st1[0] - st2[0]) || !st1[0])
245 return (st1[0] - st2[0]);
247 else if ((st1[1] - st2[1]) || !st1[1])
249 return (st1[1] - st2[1]);
253 /* Note: I replaced the STRCMP line (commented out below)
254 * with a simpler "strcmp()" which compares the 2 strings
255 * from the beginning. (STRCMP is a macro which first compares
256 * the initial characters, then falls back on strcmp).
257 * The reason is that the STRCMP line was tickling a C compiler
258 * bug on HP-UX 10.30, which is avoided with the simpler
259 * code. The performance gain from the more complicated code
260 * is negligible, given that we have already checked the
261 * initial 2 characters above. I reported the compiler bug,
262 * and once it is fixed the original line can be put back. RT
264 /* return ( STRCMP (st1 + 2, st2 + 2)); */
265 return (strcmp (st1, st2));
270 sort_pst_symbols (pst)
271 struct partial_symtab *pst;
273 /* Sort the global list; don't sort the static list */
275 qsort (pst->objfile->global_psymbols.list + pst->globals_offset,
276 pst->n_global_syms, sizeof (struct partial_symbol *),
280 /* Call sort_block_syms to sort alphabetically the symbols of one block. */
284 register struct block *b;
286 qsort (&BLOCK_SYM (b, 0), BLOCK_NSYMS (b),
287 sizeof (struct symbol *), compare_symbols);
290 /* Call sort_symtab_syms to sort alphabetically
291 the symbols of each block of one symtab. */
295 register struct symtab *s;
297 register struct blockvector *bv;
300 register struct block *b;
304 bv = BLOCKVECTOR (s);
305 nbl = BLOCKVECTOR_NBLOCKS (bv);
306 for (i = 0; i < nbl; i++)
308 b = BLOCKVECTOR_BLOCK (bv, i);
309 if (BLOCK_SHOULD_SORT (b))
314 /* Make a null terminated copy of the string at PTR with SIZE characters in
315 the obstack pointed to by OBSTACKP . Returns the address of the copy.
316 Note that the string at PTR does not have to be null terminated, I.E. it
317 may be part of a larger string and we are only saving a substring. */
320 obsavestring (ptr, size, obstackp)
323 struct obstack *obstackp;
325 register char *p = (char *) obstack_alloc (obstackp, size + 1);
326 /* Open-coded memcpy--saves function call time. These strings are usually
327 short. FIXME: Is this really still true with a compiler that can
330 register char *p1 = ptr;
331 register char *p2 = p;
332 char *end = ptr + size;
340 /* Concatenate strings S1, S2 and S3; return the new string. Space is found
341 in the obstack pointed to by OBSTACKP. */
344 obconcat (obstackp, s1, s2, s3)
345 struct obstack *obstackp;
346 const char *s1, *s2, *s3;
348 register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
349 register char *val = (char *) obstack_alloc (obstackp, len);
356 /* True if we are nested inside psymtab_to_symtab. */
358 int currently_reading_symtab = 0;
361 decrement_reading_symtab (dummy)
364 currently_reading_symtab--;
367 /* Get the symbol table that corresponds to a partial_symtab.
368 This is fast after the first time you do it. In fact, there
369 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
373 psymtab_to_symtab (pst)
374 register struct partial_symtab *pst;
376 /* If it's been looked up before, return it. */
380 /* If it has not yet been read in, read it. */
383 struct cleanup *back_to = make_cleanup (decrement_reading_symtab, NULL);
384 currently_reading_symtab++;
385 (*pst->read_symtab) (pst);
386 do_cleanups (back_to);
392 /* Initialize entry point information for this objfile. */
395 init_entry_point_info (objfile)
396 struct objfile *objfile;
398 /* Save startup file's range of PC addresses to help blockframe.c
399 decide where the bottom of the stack is. */
401 if (bfd_get_file_flags (objfile->obfd) & EXEC_P)
403 /* Executable file -- record its entry point so we'll recognize
404 the startup file because it contains the entry point. */
405 objfile->ei.entry_point = bfd_get_start_address (objfile->obfd);
409 /* Examination of non-executable.o files. Short-circuit this stuff. */
410 objfile->ei.entry_point = INVALID_ENTRY_POINT;
412 objfile->ei.entry_file_lowpc = INVALID_ENTRY_LOWPC;
413 objfile->ei.entry_file_highpc = INVALID_ENTRY_HIGHPC;
414 objfile->ei.entry_func_lowpc = INVALID_ENTRY_LOWPC;
415 objfile->ei.entry_func_highpc = INVALID_ENTRY_HIGHPC;
416 objfile->ei.main_func_lowpc = INVALID_ENTRY_LOWPC;
417 objfile->ei.main_func_highpc = INVALID_ENTRY_HIGHPC;
420 /* Get current entry point address. */
423 entry_point_address ()
425 return symfile_objfile ? symfile_objfile->ei.entry_point : 0;
428 /* Remember the lowest-addressed loadable section we've seen.
429 This function is called via bfd_map_over_sections.
431 In case of equal vmas, the section with the largest size becomes the
432 lowest-addressed loadable section.
434 If the vmas and sizes are equal, the last section is considered the
435 lowest-addressed loadable section. */
438 find_lowest_section (abfd, sect, obj)
443 asection **lowest = (asection **) obj;
445 if (0 == (bfd_get_section_flags (abfd, sect) & SEC_LOAD))
448 *lowest = sect; /* First loadable section */
449 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
450 *lowest = sect; /* A lower loadable section */
451 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
452 && (bfd_section_size (abfd, (*lowest))
453 <= bfd_section_size (abfd, sect)))
457 /* Parse the user's idea of an offset for dynamic linking, into our idea
458 of how to represent it for fast symbol reading. This is the default
459 version of the sym_fns.sym_offsets function for symbol readers that
460 don't need to do anything special. It allocates a section_offsets table
461 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
463 struct section_offsets *
464 default_symfile_offsets (objfile, addr)
465 struct objfile *objfile;
468 struct section_offsets *section_offsets;
471 objfile->num_sections = SECT_OFF_MAX;
472 section_offsets = (struct section_offsets *)
473 obstack_alloc (&objfile->psymbol_obstack, SIZEOF_SECTION_OFFSETS);
475 for (i = 0; i < SECT_OFF_MAX; i++)
476 ANOFFSET (section_offsets, i) = addr;
478 return section_offsets;
482 /* Process a symbol file, as either the main file or as a dynamically
485 NAME is the file name (which will be tilde-expanded and made
486 absolute herein) (but we don't free or modify NAME itself).
487 FROM_TTY says how verbose to be. MAINLINE specifies whether this
488 is the main symbol file, or whether it's an extra symbol file such
489 as dynamically loaded code. If !mainline, ADDR is the address
490 where the text segment was loaded. If VERBO, the caller has printed
491 a verbose message about the symbol reading (and complaints can be
492 more terse about it). */
495 syms_from_objfile (objfile, addr, mainline, verbo)
496 struct objfile *objfile;
501 struct section_offsets *section_offsets;
502 asection *lowest_sect;
503 struct cleanup *old_chain;
505 init_entry_point_info (objfile);
506 find_sym_fns (objfile);
508 /* Make sure that partially constructed symbol tables will be cleaned up
509 if an error occurs during symbol reading. */
510 old_chain = make_cleanup ((make_cleanup_func) free_objfile, objfile);
514 /* We will modify the main symbol table, make sure that all its users
515 will be cleaned up if an error occurs during symbol reading. */
516 make_cleanup ((make_cleanup_func) clear_symtab_users, 0);
518 /* Since no error yet, throw away the old symbol table. */
520 if (symfile_objfile != NULL)
522 free_objfile (symfile_objfile);
523 symfile_objfile = NULL;
526 /* Currently we keep symbols from the add-symbol-file command.
527 If the user wants to get rid of them, they should do "symbol-file"
528 without arguments first. Not sure this is the best behavior
531 (*objfile->sf->sym_new_init) (objfile);
534 /* Convert addr into an offset rather than an absolute address.
535 We find the lowest address of a loaded segment in the objfile,
536 and assume that <addr> is where that got loaded. Due to historical
537 precedent, we warn if that doesn't happen to be a text segment. */
541 addr = 0; /* No offset from objfile addresses. */
545 lowest_sect = bfd_get_section_by_name (objfile->obfd, ".text");
546 if (lowest_sect == NULL)
547 bfd_map_over_sections (objfile->obfd, find_lowest_section,
548 (PTR) & lowest_sect);
550 if (lowest_sect == NULL)
551 warning ("no loadable sections found in added symbol-file %s",
553 else if ((bfd_get_section_flags (objfile->obfd, lowest_sect) & SEC_CODE)
555 /* FIXME-32x64--assumes bfd_vma fits in long. */
556 warning ("Lowest section in %s is %s at 0x%lx",
558 bfd_section_name (objfile->obfd, lowest_sect),
559 (unsigned long) bfd_section_vma (objfile->obfd, lowest_sect));
562 addr -= bfd_section_vma (objfile->obfd, lowest_sect);
565 /* Initialize symbol reading routines for this objfile, allow complaints to
566 appear for this new file, and record how verbose to be, then do the
567 initial symbol reading for this file. */
569 (*objfile->sf->sym_init) (objfile);
570 clear_complaints (1, verbo);
572 section_offsets = (*objfile->sf->sym_offsets) (objfile, addr);
573 objfile->section_offsets = section_offsets;
575 #ifndef IBM6000_TARGET
576 /* This is a SVR4/SunOS specific hack, I think. In any event, it
577 screws RS/6000. sym_offsets should be doing this sort of thing,
578 because it knows the mapping between bfd sections and
580 /* This is a hack. As far as I can tell, section offsets are not
581 target dependent. They are all set to addr with a couple of
582 exceptions. The exceptions are sysvr4 shared libraries, whose
583 offsets are kept in solib structures anyway and rs6000 xcoff
584 which handles shared libraries in a completely unique way.
586 Section offsets are built similarly, except that they are built
587 by adding addr in all cases because there is no clear mapping
588 from section_offsets into actual sections. Note that solib.c
589 has a different algorythm for finding section offsets.
591 These should probably all be collapsed into some target
592 independent form of shared library support. FIXME. */
596 struct obj_section *s;
598 for (s = objfile->sections; s < objfile->sections_end; ++s)
600 s->addr -= s->offset;
602 s->endaddr -= s->offset;
607 #endif /* not IBM6000_TARGET */
609 (*objfile->sf->sym_read) (objfile, section_offsets, mainline);
611 if (!have_partial_symbols () && !have_full_symbols ())
614 printf_filtered ("(no debugging symbols found)...");
618 /* Don't allow char * to have a typename (else would get caddr_t).
619 Ditto void *. FIXME: Check whether this is now done by all the
620 symbol readers themselves (many of them now do), and if so remove
623 TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0;
624 TYPE_NAME (lookup_pointer_type (builtin_type_void)) = 0;
626 /* Mark the objfile has having had initial symbol read attempted. Note
627 that this does not mean we found any symbols... */
629 objfile->flags |= OBJF_SYMS;
631 /* Discard cleanups as symbol reading was successful. */
633 discard_cleanups (old_chain);
635 /* Call this after reading in a new symbol table to give target dependant code
636 a crack at the new symbols. For instance, this could be used to update the
637 values of target-specific symbols GDB needs to keep track of (such as
638 _sigtramp, or whatever). */
640 TARGET_SYMFILE_POSTREAD (objfile);
643 /* Perform required actions after either reading in the initial
644 symbols for a new objfile, or mapping in the symbols from a reusable
648 new_symfile_objfile (objfile, mainline, verbo)
649 struct objfile *objfile;
654 /* If this is the main symbol file we have to clean up all users of the
655 old main symbol file. Otherwise it is sufficient to fixup all the
656 breakpoints that may have been redefined by this symbol file. */
659 /* OK, make it the "real" symbol file. */
660 symfile_objfile = objfile;
662 clear_symtab_users ();
666 breakpoint_re_set ();
669 /* We're done reading the symbol file; finish off complaints. */
670 clear_complaints (0, verbo);
673 /* Process a symbol file, as either the main file or as a dynamically
676 NAME is the file name (which will be tilde-expanded and made
677 absolute herein) (but we don't free or modify NAME itself).
678 FROM_TTY says how verbose to be. MAINLINE specifies whether this
679 is the main symbol file, or whether it's an extra symbol file such
680 as dynamically loaded code. If !mainline, ADDR is the address
681 where the text segment was loaded.
683 USER_LOADED is TRUE if the add-symbol-file command was how this
684 symbol file came to be processed.
686 IS_SOLIB is TRUE if this symbol file represents a solib, as discovered
687 by the target's implementation of the solib package.
689 Upon success, returns a pointer to the objfile that was added.
690 Upon failure, jumps back to command level (never returns). */
693 symbol_file_add (name, from_tty, addr, mainline, mapped, readnow, user_loaded, is_solib)
703 struct objfile *objfile;
704 struct partial_symtab *psymtab;
707 /* Open a bfd for the file, and give user a chance to burp if we'd be
708 interactively wiping out any existing symbols. */
710 abfd = symfile_bfd_open (name);
712 if ((have_full_symbols () || have_partial_symbols ())
715 && !query ("Load new symbol table from \"%s\"? ", name))
716 error ("Not confirmed.");
718 objfile = allocate_objfile (abfd, mapped, user_loaded, is_solib);
720 /* If the objfile uses a mapped symbol file, and we have a psymtab for
721 it, then skip reading any symbols at this time. */
723 if ((objfile->flags & OBJF_MAPPED) && (objfile->flags & OBJF_SYMS))
725 /* We mapped in an existing symbol table file that already has had
726 initial symbol reading performed, so we can skip that part. Notify
727 the user that instead of reading the symbols, they have been mapped.
729 if (from_tty || info_verbose)
731 printf_filtered ("Mapped symbols for %s...", name);
733 gdb_flush (gdb_stdout);
735 init_entry_point_info (objfile);
736 find_sym_fns (objfile);
740 /* We either created a new mapped symbol table, mapped an existing
741 symbol table file which has not had initial symbol reading
742 performed, or need to read an unmapped symbol table. */
743 if (from_tty || info_verbose)
745 if (pre_add_symbol_hook)
746 pre_add_symbol_hook (name);
749 printf_filtered ("Reading symbols from %s...", name);
751 gdb_flush (gdb_stdout);
754 syms_from_objfile (objfile, addr, mainline, from_tty);
757 /* We now have at least a partial symbol table. Check to see if the
758 user requested that all symbols be read on initial access via either
759 the gdb startup command line or on a per symbol file basis. Expand
760 all partial symbol tables for this objfile if so. */
762 if (readnow || readnow_symbol_files)
764 if (from_tty || info_verbose)
766 printf_filtered ("expanding to full symbols...");
768 gdb_flush (gdb_stdout);
771 for (psymtab = objfile->psymtabs;
773 psymtab = psymtab->next)
775 psymtab_to_symtab (psymtab);
779 if (from_tty || info_verbose)
781 if (post_add_symbol_hook)
782 post_add_symbol_hook ();
785 printf_filtered ("done.\n");
786 gdb_flush (gdb_stdout);
790 new_symfile_objfile (objfile, mainline, from_tty);
792 target_new_objfile (objfile);
797 /* This is the symbol-file command. Read the file, analyze its
798 symbols, and add a struct symtab to a symtab list. The syntax of
799 the command is rather bizarre--(1) buildargv implements various
800 quoting conventions which are undocumented and have little or
801 nothing in common with the way things are quoted (or not quoted)
802 elsewhere in GDB, (2) options are used, which are not generally
803 used in GDB (perhaps "set mapped on", "set readnow on" would be
804 better), (3) the order of options matters, which is contrary to GNU
805 conventions (because it is confusing and inconvenient). */
808 symbol_file_command (args, from_tty)
814 CORE_ADDR text_relocation = 0; /* text_relocation */
815 struct cleanup *cleanups;
823 if ((have_full_symbols () || have_partial_symbols ())
825 && !query ("Discard symbol table from `%s'? ",
826 symfile_objfile->name))
827 error ("Not confirmed.");
828 free_all_objfiles ();
830 /* solib descriptors may have handles to objfiles. Since their
831 storage has just been released, we'd better wipe the solib
834 #if defined(SOLIB_RESTART)
838 symfile_objfile = NULL;
841 printf_unfiltered ("No symbol file now.\n");
844 RESET_HP_UX_GLOBALS ();
849 if ((argv = buildargv (args)) == NULL)
853 cleanups = make_cleanup_freeargv (argv);
854 while (*argv != NULL)
856 if (STREQ (*argv, "-mapped"))
860 else if (STREQ (*argv, "-readnow"))
864 else if (**argv == '-')
866 error ("unknown option `%s'", *argv);
874 /* this is for rombug remote only, to get the text relocation by
875 using link command */
876 p = strrchr (name, '/');
882 target_link (p, &text_relocation);
884 if (text_relocation == (CORE_ADDR) 0)
886 else if (text_relocation == (CORE_ADDR) - 1)
888 symbol_file_add (name, from_tty, (CORE_ADDR) 0,
889 1, mapped, readnow, 1, 0);
891 RESET_HP_UX_GLOBALS ();
895 symbol_file_add (name, from_tty, (CORE_ADDR) text_relocation,
896 0, mapped, readnow, 1, 0);
898 /* Getting new symbols may change our opinion about what is
900 reinit_frame_cache ();
902 set_initial_language ();
909 error ("no symbol file name was specified");
911 TUIDO (((TuiOpaqueFuncPtr) tuiDisplayMainFunction));
912 do_cleanups (cleanups);
916 /* Set the initial language.
918 A better solution would be to record the language in the psymtab when reading
919 partial symbols, and then use it (if known) to set the language. This would
920 be a win for formats that encode the language in an easily discoverable place,
921 such as DWARF. For stabs, we can jump through hoops looking for specially
922 named symbols or try to intuit the language from the specific type of stabs
923 we find, but we can't do that until later when we read in full symbols.
927 set_initial_language ()
929 struct partial_symtab *pst;
930 enum language lang = language_unknown;
932 pst = find_main_psymtab ();
935 if (pst->filename != NULL)
937 lang = deduce_language_from_filename (pst->filename);
939 if (lang == language_unknown)
941 /* Make C the default language */
945 expected_language = current_language; /* Don't warn the user */
949 /* Open file specified by NAME and hand it off to BFD for preliminary
950 analysis. Result is a newly initialized bfd *, which includes a newly
951 malloc'd` copy of NAME (tilde-expanded and made absolute).
952 In case of trouble, error() is called. */
955 symfile_bfd_open (name)
964 name = tilde_expand (name); /* Returns 1st new malloc'd copy */
966 /* Look down path for it, allocate 2nd new malloc'd copy. */
967 desc = openp (getenv ("PATH"), 1, name, O_RDONLY | O_BINARY, 0, &absolute_name);
968 #if defined(__GO32__) || defined(_WIN32)
971 char *exename = alloca (strlen (name) + 5);
972 strcat (strcpy (exename, name), ".exe");
973 desc = openp (getenv ("PATH"), 1, exename, O_RDONLY | O_BINARY,
979 make_cleanup (free, name);
980 perror_with_name (name);
982 free (name); /* Free 1st new malloc'd copy */
983 name = absolute_name; /* Keep 2nd malloc'd copy in bfd */
984 /* It'll be freed in free_objfile(). */
986 sym_bfd = bfd_fdopenr (name, gnutarget, desc);
990 make_cleanup (free, name);
991 error ("\"%s\": can't open to read symbols: %s.", name,
992 bfd_errmsg (bfd_get_error ()));
994 sym_bfd->cacheable = true;
996 if (!bfd_check_format (sym_bfd, bfd_object))
998 /* FIXME: should be checking for errors from bfd_close (for one thing,
999 on error it does not free all the storage associated with the
1001 bfd_close (sym_bfd); /* This also closes desc */
1002 make_cleanup (free, name);
1003 error ("\"%s\": can't read symbols: %s.", name,
1004 bfd_errmsg (bfd_get_error ()));
1009 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
1010 startup by the _initialize routine in each object file format reader,
1011 to register information about each format the the reader is prepared
1018 sf->next = symtab_fns;
1023 /* Initialize to read symbols from the symbol file sym_bfd. It either
1024 returns or calls error(). The result is an initialized struct sym_fns
1025 in the objfile structure, that contains cached information about the
1029 find_sym_fns (objfile)
1030 struct objfile *objfile;
1033 enum bfd_flavour our_flavour = bfd_get_flavour (objfile->obfd);
1034 char *our_target = bfd_get_target (objfile->obfd);
1036 /* Special kludge for RS/6000 and PowerMac. See xcoffread.c. */
1037 if (STREQ (our_target, "aixcoff-rs6000") ||
1038 STREQ (our_target, "xcoff-powermac"))
1039 our_flavour = (enum bfd_flavour) -1;
1041 /* Special kludge for apollo. See dstread.c. */
1042 if (STREQN (our_target, "apollo", 6))
1043 our_flavour = (enum bfd_flavour) -2;
1045 for (sf = symtab_fns; sf != NULL; sf = sf->next)
1047 if (our_flavour == sf->sym_flavour)
1053 error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
1054 bfd_get_target (objfile->obfd));
1057 /* This function runs the load command of our current target. */
1060 load_command (arg, from_tty)
1065 arg = get_exec_file (1);
1066 target_load (arg, from_tty);
1069 /* This version of "load" should be usable for any target. Currently
1070 it is just used for remote targets, not inftarg.c or core files,
1071 on the theory that only in that case is it useful.
1073 Avoiding xmodem and the like seems like a win (a) because we don't have
1074 to worry about finding it, and (b) On VMS, fork() is very slow and so
1075 we don't want to run a subprocess. On the other hand, I'm not sure how
1076 performance compares. */
1077 #define GENERIC_LOAD_CHUNK 256
1078 #define VALIDATE_DOWNLOAD 0
1080 generic_load (filename, from_tty)
1084 struct cleanup *old_cleanups;
1087 time_t start_time, end_time; /* Start and end times of download */
1088 unsigned long data_count = 0; /* Number of bytes transferred to memory */
1090 unsigned long load_offset = 0; /* offset to add to vma for each section */
1091 char buf[GENERIC_LOAD_CHUNK + 8];
1092 #if VALIDATE_DOWNLOAD
1093 char verify_buffer[GENERIC_LOAD_CHUNK + 8];
1096 /* enable user to specify address for downloading as 2nd arg to load */
1097 n = sscanf (filename, "%s 0x%lx", buf, &load_offset);
1103 loadfile_bfd = bfd_openr (filename, gnutarget);
1104 if (loadfile_bfd == NULL)
1106 perror_with_name (filename);
1109 /* FIXME: should be checking for errors from bfd_close (for one thing,
1110 on error it does not free all the storage associated with the
1112 old_cleanups = make_cleanup ((make_cleanup_func) bfd_close, loadfile_bfd);
1114 if (!bfd_check_format (loadfile_bfd, bfd_object))
1116 error ("\"%s\" is not an object file: %s", filename,
1117 bfd_errmsg (bfd_get_error ()));
1120 start_time = time (NULL);
1122 for (s = loadfile_bfd->sections; s; s = s->next)
1124 if (s->flags & SEC_LOAD)
1128 size = bfd_get_section_size_before_reloc (s);
1132 struct cleanup *old_chain;
1134 unsigned long l = size;
1140 l = l > GENERIC_LOAD_CHUNK ? GENERIC_LOAD_CHUNK : l;
1142 buffer = xmalloc (size);
1143 old_chain = make_cleanup (free, buffer);
1148 /* Is this really necessary? I guess it gives the user something
1149 to look at during a long download. */
1150 printf_filtered ("Loading section %s, size 0x%lx lma ",
1151 bfd_get_section_name (loadfile_bfd, s),
1152 (unsigned long) size);
1153 print_address_numeric (lma, 1, gdb_stdout);
1154 printf_filtered ("\n");
1156 bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size);
1158 sect = (char *) bfd_get_section_name (loadfile_bfd, s);
1162 len = (size - sent) < l ? (size - sent) : l;
1164 err = target_write_memory (lma, buffer, len);
1165 if (ui_load_progress_hook)
1166 if (ui_load_progress_hook (sect, sent))
1167 error ("Canceled the download");
1168 #if VALIDATE_DOWNLOAD
1169 /* Broken memories and broken monitors manifest themselves
1170 here when bring new computers to life.
1171 This doubles already slow downloads.
1176 target_read_memory (lma, verify_buffer, len);
1177 if (0 != bcmp (buffer, verify_buffer, len))
1178 error ("Download verify failed at %08x",
1179 (unsigned long) lma);
1187 while (err == 0 && sent < size);
1190 error ("Memory access error while loading section %s.",
1191 bfd_get_section_name (loadfile_bfd, s));
1193 do_cleanups (old_chain);
1198 end_time = time (NULL);
1200 unsigned long entry;
1201 entry = bfd_get_start_address (loadfile_bfd);
1202 printf_filtered ("Start address 0x%lx , load size %d\n", entry, data_count);
1203 /* We were doing this in remote-mips.c, I suspect it is right
1204 for other targets too. */
1208 /* FIXME: are we supposed to call symbol_file_add or not? According to
1209 a comment from remote-mips.c (where a call to symbol_file_add was
1210 commented out), making the call confuses GDB if more than one file is
1211 loaded in. remote-nindy.c had no call to symbol_file_add, but remote-vx.c
1214 report_transfer_performance (data_count, start_time, end_time);
1216 do_cleanups (old_cleanups);
1219 /* Report how fast the transfer went. */
1222 report_transfer_performance (data_count, start_time, end_time)
1223 unsigned long data_count;
1224 time_t start_time, end_time;
1226 printf_filtered ("Transfer rate: ");
1227 if (end_time != start_time)
1228 printf_filtered ("%d bits/sec",
1229 (data_count * 8) / (end_time - start_time));
1231 printf_filtered ("%d bits in <1 sec", (data_count * 8));
1232 printf_filtered (".\n");
1235 /* This function allows the addition of incrementally linked object files.
1236 It does not modify any state in the target, only in the debugger. */
1240 add_symbol_file_command (args, from_tty)
1245 CORE_ADDR text_addr;
1254 error ("add-symbol-file takes a file name and an address");
1257 /* Make a copy of the string that we can safely write into. */
1259 args = strdup (args);
1260 make_cleanup (free, args);
1262 /* Pick off any -option args and the file name. */
1264 while ((*args != '\000') && (name == NULL))
1266 while (isspace (*args))
1271 while ((*args != '\000') && !isspace (*args))
1275 if (*args != '\000')
1283 else if (STREQ (arg, "-mapped"))
1287 else if (STREQ (arg, "-readnow"))
1293 error ("unknown option `%s'", arg);
1297 /* After picking off any options and the file name, args should be
1298 left pointing at the remainder of the command line, which should
1299 be the address expression to evaluate. */
1303 error ("add-symbol-file takes a file name");
1305 name = tilde_expand (name);
1306 make_cleanup (free, name);
1308 if (*args != '\000')
1310 text_addr = parse_and_eval_address (args);
1314 target_link (name, &text_addr);
1315 if (text_addr == (CORE_ADDR) - 1)
1316 error ("Don't know how to get text start location for this file");
1319 /* FIXME-32x64: Assumes text_addr fits in a long. */
1321 && (!query ("add symbol table from file \"%s\" at text_addr = %s?\n",
1322 name, local_hex_string ((unsigned long) text_addr))))
1323 error ("Not confirmed.");
1325 symbol_file_add (name, from_tty, text_addr, 0, mapped, readnow,
1326 1, /* user_loaded */
1327 0); /* We'll guess it's ! is_solib */
1329 /* Getting new symbols may change our opinion about what is
1331 reinit_frame_cache ();
1335 add_shared_symbol_files_command (args, from_tty)
1339 #ifdef ADD_SHARED_SYMBOL_FILES
1340 ADD_SHARED_SYMBOL_FILES (args, from_tty);
1342 error ("This command is not available in this configuration of GDB.");
1346 /* Re-read symbols if a symbol-file has changed. */
1350 struct objfile *objfile;
1353 struct stat new_statbuf;
1356 /* With the addition of shared libraries, this should be modified,
1357 the load time should be saved in the partial symbol tables, since
1358 different tables may come from different source files. FIXME.
1359 This routine should then walk down each partial symbol table
1360 and see if the symbol table that it originates from has been changed */
1362 for (objfile = object_files; objfile; objfile = objfile->next)
1366 #ifdef IBM6000_TARGET
1367 /* If this object is from a shared library, then you should
1368 stat on the library name, not member name. */
1370 if (objfile->obfd->my_archive)
1371 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
1374 res = stat (objfile->name, &new_statbuf);
1377 /* FIXME, should use print_sys_errmsg but it's not filtered. */
1378 printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
1382 new_modtime = new_statbuf.st_mtime;
1383 if (new_modtime != objfile->mtime)
1385 struct cleanup *old_cleanups;
1386 struct section_offsets *offsets;
1388 int section_offsets_size;
1389 char *obfd_filename;
1391 printf_filtered ("`%s' has changed; re-reading symbols.\n",
1394 /* There are various functions like symbol_file_add,
1395 symfile_bfd_open, syms_from_objfile, etc., which might
1396 appear to do what we want. But they have various other
1397 effects which we *don't* want. So we just do stuff
1398 ourselves. We don't worry about mapped files (for one thing,
1399 any mapped file will be out of date). */
1401 /* If we get an error, blow away this objfile (not sure if
1402 that is the correct response for things like shared
1404 old_cleanups = make_cleanup ((make_cleanup_func) free_objfile,
1406 /* We need to do this whenever any symbols go away. */
1407 make_cleanup ((make_cleanup_func) clear_symtab_users, 0);
1409 /* Clean up any state BFD has sitting around. We don't need
1410 to close the descriptor but BFD lacks a way of closing the
1411 BFD without closing the descriptor. */
1412 obfd_filename = bfd_get_filename (objfile->obfd);
1413 if (!bfd_close (objfile->obfd))
1414 error ("Can't close BFD for %s: %s", objfile->name,
1415 bfd_errmsg (bfd_get_error ()));
1416 objfile->obfd = bfd_openr (obfd_filename, gnutarget);
1417 if (objfile->obfd == NULL)
1418 error ("Can't open %s to read symbols.", objfile->name);
1419 /* bfd_openr sets cacheable to true, which is what we want. */
1420 if (!bfd_check_format (objfile->obfd, bfd_object))
1421 error ("Can't read symbols from %s: %s.", objfile->name,
1422 bfd_errmsg (bfd_get_error ()));
1424 /* Save the offsets, we will nuke them with the rest of the
1426 num_offsets = objfile->num_sections;
1427 section_offsets_size =
1428 sizeof (struct section_offsets)
1429 + sizeof (objfile->section_offsets->offsets) * num_offsets;
1430 offsets = (struct section_offsets *) alloca (section_offsets_size);
1431 memcpy (offsets, objfile->section_offsets, section_offsets_size);
1433 /* Nuke all the state that we will re-read. Much of the following
1434 code which sets things to NULL really is necessary to tell
1435 other parts of GDB that there is nothing currently there. */
1437 /* FIXME: Do we have to free a whole linked list, or is this
1439 if (objfile->global_psymbols.list)
1440 mfree (objfile->md, objfile->global_psymbols.list);
1441 memset (&objfile->global_psymbols, 0,
1442 sizeof (objfile->global_psymbols));
1443 if (objfile->static_psymbols.list)
1444 mfree (objfile->md, objfile->static_psymbols.list);
1445 memset (&objfile->static_psymbols, 0,
1446 sizeof (objfile->static_psymbols));
1448 /* Free the obstacks for non-reusable objfiles */
1449 obstack_free (&objfile->psymbol_cache.cache, 0);
1450 memset (&objfile->psymbol_cache, 0,
1451 sizeof (objfile->psymbol_cache));
1452 obstack_free (&objfile->psymbol_obstack, 0);
1453 obstack_free (&objfile->symbol_obstack, 0);
1454 obstack_free (&objfile->type_obstack, 0);
1455 objfile->sections = NULL;
1456 objfile->symtabs = NULL;
1457 objfile->psymtabs = NULL;
1458 objfile->free_psymtabs = NULL;
1459 objfile->msymbols = NULL;
1460 objfile->minimal_symbol_count = 0;
1461 objfile->fundamental_types = NULL;
1462 if (objfile->sf != NULL)
1464 (*objfile->sf->sym_finish) (objfile);
1467 /* We never make this a mapped file. */
1469 /* obstack_specify_allocation also initializes the obstack so
1471 obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0,
1473 obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0,
1475 obstack_specify_allocation (&objfile->symbol_obstack, 0, 0,
1477 obstack_specify_allocation (&objfile->type_obstack, 0, 0,
1479 if (build_objfile_section_table (objfile))
1481 error ("Can't find the file sections in `%s': %s",
1482 objfile->name, bfd_errmsg (bfd_get_error ()));
1485 /* We use the same section offsets as from last time. I'm not
1486 sure whether that is always correct for shared libraries. */
1487 objfile->section_offsets = (struct section_offsets *)
1488 obstack_alloc (&objfile->psymbol_obstack, section_offsets_size);
1489 memcpy (objfile->section_offsets, offsets, section_offsets_size);
1490 objfile->num_sections = num_offsets;
1492 /* What the hell is sym_new_init for, anyway? The concept of
1493 distinguishing between the main file and additional files
1494 in this way seems rather dubious. */
1495 if (objfile == symfile_objfile)
1497 (*objfile->sf->sym_new_init) (objfile);
1499 RESET_HP_UX_GLOBALS ();
1503 (*objfile->sf->sym_init) (objfile);
1504 clear_complaints (1, 1);
1505 /* The "mainline" parameter is a hideous hack; I think leaving it
1506 zero is OK since dbxread.c also does what it needs to do if
1507 objfile->global_psymbols.size is 0. */
1508 (*objfile->sf->sym_read) (objfile, objfile->section_offsets, 0);
1509 if (!have_partial_symbols () && !have_full_symbols ())
1512 printf_filtered ("(no debugging symbols found)\n");
1515 objfile->flags |= OBJF_SYMS;
1517 /* We're done reading the symbol file; finish off complaints. */
1518 clear_complaints (0, 1);
1520 /* Getting new symbols may change our opinion about what is
1523 reinit_frame_cache ();
1525 /* Discard cleanups as symbol reading was successful. */
1526 discard_cleanups (old_cleanups);
1528 /* If the mtime has changed between the time we set new_modtime
1529 and now, we *want* this to be out of date, so don't call stat
1531 objfile->mtime = new_modtime;
1534 /* Call this after reading in a new symbol table to give target
1535 dependant code a crack at the new symbols. For instance, this
1536 could be used to update the values of target-specific symbols GDB
1537 needs to keep track of (such as _sigtramp, or whatever). */
1539 TARGET_SYMFILE_POSTREAD (objfile);
1545 clear_symtab_users ();
1557 static filename_language *filename_language_table;
1558 static int fl_table_size, fl_table_next;
1561 add_filename_language (ext, lang)
1565 if (fl_table_next >= fl_table_size)
1567 fl_table_size += 10;
1568 filename_language_table = realloc (filename_language_table,
1572 filename_language_table[fl_table_next].ext = strsave (ext);
1573 filename_language_table[fl_table_next].lang = lang;
1577 static char *ext_args;
1580 set_ext_lang_command (args, from_tty)
1585 char *cp = ext_args;
1588 /* First arg is filename extension, starting with '.' */
1590 error ("'%s': Filename extension must begin with '.'", ext_args);
1592 /* Find end of first arg. */
1593 while (*cp && !isspace (*cp))
1597 error ("'%s': two arguments required -- filename extension and language",
1600 /* Null-terminate first arg */
1603 /* Find beginning of second arg, which should be a source language. */
1604 while (*cp && isspace (*cp))
1608 error ("'%s': two arguments required -- filename extension and language",
1611 /* Lookup the language from among those we know. */
1612 lang = language_enum (cp);
1614 /* Now lookup the filename extension: do we already know it? */
1615 for (i = 0; i < fl_table_next; i++)
1616 if (0 == strcmp (ext_args, filename_language_table[i].ext))
1619 if (i >= fl_table_next)
1621 /* new file extension */
1622 add_filename_language (ext_args, lang);
1626 /* redefining a previously known filename extension */
1629 /* query ("Really make files of type %s '%s'?", */
1630 /* ext_args, language_str (lang)); */
1632 free (filename_language_table[i].ext);
1633 filename_language_table[i].ext = strsave (ext_args);
1634 filename_language_table[i].lang = lang;
1639 info_ext_lang_command (args, from_tty)
1645 printf_filtered ("Filename extensions and the languages they represent:");
1646 printf_filtered ("\n\n");
1647 for (i = 0; i < fl_table_next; i++)
1648 printf_filtered ("\t%s\t- %s\n",
1649 filename_language_table[i].ext,
1650 language_str (filename_language_table[i].lang));
1654 init_filename_language_table ()
1656 if (fl_table_size == 0) /* protect against repetition */
1660 filename_language_table =
1661 xmalloc (fl_table_size * sizeof (*filename_language_table));
1662 add_filename_language (".c", language_c);
1663 add_filename_language (".C", language_cplus);
1664 add_filename_language (".cc", language_cplus);
1665 add_filename_language (".cp", language_cplus);
1666 add_filename_language (".cpp", language_cplus);
1667 add_filename_language (".cxx", language_cplus);
1668 add_filename_language (".c++", language_cplus);
1669 add_filename_language (".java", language_java);
1670 add_filename_language (".class", language_java);
1671 add_filename_language (".ch", language_chill);
1672 add_filename_language (".c186", language_chill);
1673 add_filename_language (".c286", language_chill);
1674 add_filename_language (".f", language_fortran);
1675 add_filename_language (".F", language_fortran);
1676 add_filename_language (".s", language_asm);
1677 add_filename_language (".S", language_asm);
1682 deduce_language_from_filename (filename)
1688 if (filename != NULL)
1689 if ((cp = strrchr (filename, '.')) != NULL)
1690 for (i = 0; i < fl_table_next; i++)
1691 if (strcmp (cp, filename_language_table[i].ext) == 0)
1692 return filename_language_table[i].lang;
1694 return language_unknown;
1699 Allocate and partly initialize a new symbol table. Return a pointer
1700 to it. error() if no space.
1702 Caller must set these fields:
1708 possibly free_named_symtabs (symtab->filename);
1712 allocate_symtab (filename, objfile)
1714 struct objfile *objfile;
1716 register struct symtab *symtab;
1718 symtab = (struct symtab *)
1719 obstack_alloc (&objfile->symbol_obstack, sizeof (struct symtab));
1720 memset (symtab, 0, sizeof (*symtab));
1721 symtab->filename = obsavestring (filename, strlen (filename),
1722 &objfile->symbol_obstack);
1723 symtab->fullname = NULL;
1724 symtab->language = deduce_language_from_filename (filename);
1725 symtab->debugformat = obsavestring ("unknown", 7,
1726 &objfile->symbol_obstack);
1728 /* Hook it to the objfile it comes from */
1730 symtab->objfile = objfile;
1731 symtab->next = objfile->symtabs;
1732 objfile->symtabs = symtab;
1734 /* FIXME: This should go away. It is only defined for the Z8000,
1735 and the Z8000 definition of this macro doesn't have anything to
1736 do with the now-nonexistent EXTRA_SYMTAB_INFO macro, it's just
1737 here for convenience. */
1738 #ifdef INIT_EXTRA_SYMTAB_INFO
1739 INIT_EXTRA_SYMTAB_INFO (symtab);
1745 struct partial_symtab *
1746 allocate_psymtab (filename, objfile)
1748 struct objfile *objfile;
1750 struct partial_symtab *psymtab;
1752 if (objfile->free_psymtabs)
1754 psymtab = objfile->free_psymtabs;
1755 objfile->free_psymtabs = psymtab->next;
1758 psymtab = (struct partial_symtab *)
1759 obstack_alloc (&objfile->psymbol_obstack,
1760 sizeof (struct partial_symtab));
1762 memset (psymtab, 0, sizeof (struct partial_symtab));
1763 psymtab->filename = obsavestring (filename, strlen (filename),
1764 &objfile->psymbol_obstack);
1765 psymtab->symtab = NULL;
1767 /* Prepend it to the psymtab list for the objfile it belongs to.
1768 Psymtabs are searched in most recent inserted -> least recent
1771 psymtab->objfile = objfile;
1772 psymtab->next = objfile->psymtabs;
1773 objfile->psymtabs = psymtab;
1776 struct partial_symtab **prev_pst;
1777 psymtab->objfile = objfile;
1778 psymtab->next = NULL;
1779 prev_pst = &(objfile->psymtabs);
1780 while ((*prev_pst) != NULL)
1781 prev_pst = &((*prev_pst)->next);
1782 (*prev_pst) = psymtab;
1790 discard_psymtab (pst)
1791 struct partial_symtab *pst;
1793 struct partial_symtab **prev_pst;
1796 Empty psymtabs happen as a result of header files which don't
1797 have any symbols in them. There can be a lot of them. But this
1798 check is wrong, in that a psymtab with N_SLINE entries but
1799 nothing else is not empty, but we don't realize that. Fixing
1800 that without slowing things down might be tricky. */
1802 /* First, snip it out of the psymtab chain */
1804 prev_pst = &(pst->objfile->psymtabs);
1805 while ((*prev_pst) != pst)
1806 prev_pst = &((*prev_pst)->next);
1807 (*prev_pst) = pst->next;
1809 /* Next, put it on a free list for recycling */
1811 pst->next = pst->objfile->free_psymtabs;
1812 pst->objfile->free_psymtabs = pst;
1816 /* Reset all data structures in gdb which may contain references to symbol
1820 clear_symtab_users ()
1822 /* Someday, we should do better than this, by only blowing away
1823 the things that really need to be blown. */
1824 clear_value_history ();
1826 clear_internalvars ();
1827 breakpoint_re_set ();
1828 set_default_breakpoint (0, 0, 0, 0);
1829 current_source_symtab = 0;
1830 current_source_line = 0;
1831 clear_pc_function_cache ();
1832 target_new_objfile (NULL);
1835 /* clear_symtab_users_once:
1837 This function is run after symbol reading, or from a cleanup.
1838 If an old symbol table was obsoleted, the old symbol table
1839 has been blown away, but the other GDB data structures that may
1840 reference it have not yet been cleared or re-directed. (The old
1841 symtab was zapped, and the cleanup queued, in free_named_symtab()
1844 This function can be queued N times as a cleanup, or called
1845 directly; it will do all the work the first time, and then will be a
1846 no-op until the next time it is queued. This works by bumping a
1847 counter at queueing time. Much later when the cleanup is run, or at
1848 the end of symbol processing (in case the cleanup is discarded), if
1849 the queued count is greater than the "done-count", we do the work
1850 and set the done-count to the queued count. If the queued count is
1851 less than or equal to the done-count, we just ignore the call. This
1852 is needed because reading a single .o file will often replace many
1853 symtabs (one per .h file, for example), and we don't want to reset
1854 the breakpoints N times in the user's face.
1856 The reason we both queue a cleanup, and call it directly after symbol
1857 reading, is because the cleanup protects us in case of errors, but is
1858 discarded if symbol reading is successful. */
1861 /* FIXME: As free_named_symtabs is currently a big noop this function
1862 is no longer needed. */
1864 clear_symtab_users_once PARAMS ((void));
1866 static int clear_symtab_users_queued;
1867 static int clear_symtab_users_done;
1870 clear_symtab_users_once ()
1872 /* Enforce once-per-`do_cleanups'-semantics */
1873 if (clear_symtab_users_queued <= clear_symtab_users_done)
1875 clear_symtab_users_done = clear_symtab_users_queued;
1877 clear_symtab_users ();
1881 /* Delete the specified psymtab, and any others that reference it. */
1884 cashier_psymtab (pst)
1885 struct partial_symtab *pst;
1887 struct partial_symtab *ps, *pprev = NULL;
1890 /* Find its previous psymtab in the chain */
1891 for (ps = pst->objfile->psymtabs; ps; ps = ps->next)
1900 /* Unhook it from the chain. */
1901 if (ps == pst->objfile->psymtabs)
1902 pst->objfile->psymtabs = ps->next;
1904 pprev->next = ps->next;
1906 /* FIXME, we can't conveniently deallocate the entries in the
1907 partial_symbol lists (global_psymbols/static_psymbols) that
1908 this psymtab points to. These just take up space until all
1909 the psymtabs are reclaimed. Ditto the dependencies list and
1910 filename, which are all in the psymbol_obstack. */
1912 /* We need to cashier any psymtab that has this one as a dependency... */
1914 for (ps = pst->objfile->psymtabs; ps; ps = ps->next)
1916 for (i = 0; i < ps->number_of_dependencies; i++)
1918 if (ps->dependencies[i] == pst)
1920 cashier_psymtab (ps);
1921 goto again; /* Must restart, chain has been munged. */
1928 /* If a symtab or psymtab for filename NAME is found, free it along
1929 with any dependent breakpoints, displays, etc.
1930 Used when loading new versions of object modules with the "add-file"
1931 command. This is only called on the top-level symtab or psymtab's name;
1932 it is not called for subsidiary files such as .h files.
1934 Return value is 1 if we blew away the environment, 0 if not.
1935 FIXME. The return valu appears to never be used.
1937 FIXME. I think this is not the best way to do this. We should
1938 work on being gentler to the environment while still cleaning up
1939 all stray pointers into the freed symtab. */
1942 free_named_symtabs (name)
1946 /* FIXME: With the new method of each objfile having it's own
1947 psymtab list, this function needs serious rethinking. In particular,
1948 why was it ever necessary to toss psymtabs with specific compilation
1949 unit filenames, as opposed to all psymtabs from a particular symbol
1951 Well, the answer is that some systems permit reloading of particular
1952 compilation units. We want to blow away any old info about these
1953 compilation units, regardless of which objfiles they arrived in. --gnu. */
1955 register struct symtab *s;
1956 register struct symtab *prev;
1957 register struct partial_symtab *ps;
1958 struct blockvector *bv;
1961 /* We only wack things if the symbol-reload switch is set. */
1962 if (!symbol_reloading)
1965 /* Some symbol formats have trouble providing file names... */
1966 if (name == 0 || *name == '\0')
1969 /* Look for a psymtab with the specified name. */
1972 for (ps = partial_symtab_list; ps; ps = ps->next)
1974 if (STREQ (name, ps->filename))
1976 cashier_psymtab (ps); /* Blow it away...and its little dog, too. */
1977 goto again2; /* Must restart, chain has been munged */
1981 /* Look for a symtab with the specified name. */
1983 for (s = symtab_list; s; s = s->next)
1985 if (STREQ (name, s->filename))
1992 if (s == symtab_list)
1993 symtab_list = s->next;
1995 prev->next = s->next;
1997 /* For now, queue a delete for all breakpoints, displays, etc., whether
1998 or not they depend on the symtab being freed. This should be
1999 changed so that only those data structures affected are deleted. */
2001 /* But don't delete anything if the symtab is empty.
2002 This test is necessary due to a bug in "dbxread.c" that
2003 causes empty symtabs to be created for N_SO symbols that
2004 contain the pathname of the object file. (This problem
2005 has been fixed in GDB 3.9x). */
2007 bv = BLOCKVECTOR (s);
2008 if (BLOCKVECTOR_NBLOCKS (bv) > 2
2009 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
2010 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)))
2012 complain (&oldsyms_complaint, name);
2014 clear_symtab_users_queued++;
2015 make_cleanup (clear_symtab_users_once, 0);
2020 complain (&empty_symtab_complaint, name);
2027 /* It is still possible that some breakpoints will be affected
2028 even though no symtab was found, since the file might have
2029 been compiled without debugging, and hence not be associated
2030 with a symtab. In order to handle this correctly, we would need
2031 to keep a list of text address ranges for undebuggable files.
2032 For now, we do nothing, since this is a fairly obscure case. */
2036 /* FIXME, what about the minimal symbol table? */
2043 /* Allocate and partially fill a partial symtab. It will be
2044 completely filled at the end of the symbol list.
2046 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
2047 is the address relative to which its symbols are (incremental) or 0
2051 struct partial_symtab *
2052 start_psymtab_common (objfile, section_offsets,
2053 filename, textlow, global_syms, static_syms)
2054 struct objfile *objfile;
2055 struct section_offsets *section_offsets;
2058 struct partial_symbol **global_syms;
2059 struct partial_symbol **static_syms;
2061 struct partial_symtab *psymtab;
2063 psymtab = allocate_psymtab (filename, objfile);
2064 psymtab->section_offsets = section_offsets;
2065 psymtab->textlow = textlow;
2066 psymtab->texthigh = psymtab->textlow; /* default */
2067 psymtab->globals_offset = global_syms - objfile->global_psymbols.list;
2068 psymtab->statics_offset = static_syms - objfile->static_psymbols.list;
2072 /* Add a symbol with a long value to a psymtab.
2073 Since one arg is a struct, we pass in a ptr and deref it (sigh). */
2076 add_psymbol_to_list (name, namelength, namespace, class, list, val, coreaddr,
2080 namespace_enum namespace;
2081 enum address_class class;
2082 struct psymbol_allocation_list *list;
2083 long val; /* Value as a long */
2084 CORE_ADDR coreaddr; /* Value as a CORE_ADDR */
2085 enum language language;
2086 struct objfile *objfile;
2088 register struct partial_symbol *psym;
2089 char *buf = alloca (namelength + 1);
2090 /* psymbol is static so that there will be no uninitialized gaps in the
2091 structure which might contain random data, causing cache misses in
2093 static struct partial_symbol psymbol;
2095 /* Create local copy of the partial symbol */
2096 memcpy (buf, name, namelength);
2097 buf[namelength] = '\0';
2098 SYMBOL_NAME (&psymbol) = bcache (buf, namelength + 1, &objfile->psymbol_cache);
2099 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2102 SYMBOL_VALUE (&psymbol) = val;
2106 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2108 SYMBOL_SECTION (&psymbol) = 0;
2109 SYMBOL_LANGUAGE (&psymbol) = language;
2110 PSYMBOL_NAMESPACE (&psymbol) = namespace;
2111 PSYMBOL_CLASS (&psymbol) = class;
2112 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2114 /* Stash the partial symbol away in the cache */
2115 psym = bcache (&psymbol, sizeof (struct partial_symbol), &objfile->psymbol_cache);
2117 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2118 if (list->next >= list->list + list->size)
2120 extend_psymbol_list (list, objfile);
2122 *list->next++ = psym;
2123 OBJSTAT (objfile, n_psyms++);
2126 /* Add a symbol with a long value to a psymtab. This differs from
2127 * add_psymbol_to_list above in taking both a mangled and a demangled
2131 add_psymbol_with_dem_name_to_list (name, namelength, dem_name, dem_namelength,
2132 namespace, class, list, val, coreaddr, language, objfile)
2137 namespace_enum namespace;
2138 enum address_class class;
2139 struct psymbol_allocation_list *list;
2140 long val; /* Value as a long */
2141 CORE_ADDR coreaddr; /* Value as a CORE_ADDR */
2142 enum language language;
2143 struct objfile *objfile;
2145 register struct partial_symbol *psym;
2146 char *buf = alloca (namelength + 1);
2147 /* psymbol is static so that there will be no uninitialized gaps in the
2148 structure which might contain random data, causing cache misses in
2150 static struct partial_symbol psymbol;
2152 /* Create local copy of the partial symbol */
2154 memcpy (buf, name, namelength);
2155 buf[namelength] = '\0';
2156 SYMBOL_NAME (&psymbol) = bcache (buf, namelength + 1, &objfile->psymbol_cache);
2158 buf = alloca (dem_namelength + 1);
2159 memcpy (buf, dem_name, dem_namelength);
2160 buf[dem_namelength] = '\0';
2165 case language_cplus:
2166 SYMBOL_CPLUS_DEMANGLED_NAME (&psymbol) =
2167 bcache (buf, dem_namelength + 1, &objfile->psymbol_cache);
2169 case language_chill:
2170 SYMBOL_CHILL_DEMANGLED_NAME (&psymbol) =
2171 bcache (buf, dem_namelength + 1, &objfile->psymbol_cache);
2173 /* FIXME What should be done for the default case? Ignoring for now. */
2176 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2179 SYMBOL_VALUE (&psymbol) = val;
2183 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2185 SYMBOL_SECTION (&psymbol) = 0;
2186 SYMBOL_LANGUAGE (&psymbol) = language;
2187 PSYMBOL_NAMESPACE (&psymbol) = namespace;
2188 PSYMBOL_CLASS (&psymbol) = class;
2189 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2191 /* Stash the partial symbol away in the cache */
2192 psym = bcache (&psymbol, sizeof (struct partial_symbol), &objfile->psymbol_cache);
2194 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2195 if (list->next >= list->list + list->size)
2197 extend_psymbol_list (list, objfile);
2199 *list->next++ = psym;
2200 OBJSTAT (objfile, n_psyms++);
2203 /* Initialize storage for partial symbols. */
2206 init_psymbol_list (objfile, total_symbols)
2207 struct objfile *objfile;
2210 /* Free any previously allocated psymbol lists. */
2212 if (objfile->global_psymbols.list)
2214 mfree (objfile->md, (PTR) objfile->global_psymbols.list);
2216 if (objfile->static_psymbols.list)
2218 mfree (objfile->md, (PTR) objfile->static_psymbols.list);
2221 /* Current best guess is that approximately a twentieth
2222 of the total symbols (in a debugging file) are global or static
2225 objfile->global_psymbols.size = total_symbols / 10;
2226 objfile->static_psymbols.size = total_symbols / 10;
2228 if (objfile->global_psymbols.size > 0)
2230 objfile->global_psymbols.next =
2231 objfile->global_psymbols.list = (struct partial_symbol **)
2232 xmmalloc (objfile->md, (objfile->global_psymbols.size
2233 * sizeof (struct partial_symbol *)));
2235 if (objfile->static_psymbols.size > 0)
2237 objfile->static_psymbols.next =
2238 objfile->static_psymbols.list = (struct partial_symbol **)
2239 xmmalloc (objfile->md, (objfile->static_psymbols.size
2240 * sizeof (struct partial_symbol *)));
2245 The following code implements an abstraction for debugging overlay sections.
2247 The target model is as follows:
2248 1) The gnu linker will permit multiple sections to be mapped into the
2249 same VMA, each with its own unique LMA (or load address).
2250 2) It is assumed that some runtime mechanism exists for mapping the
2251 sections, one by one, from the load address into the VMA address.
2252 3) This code provides a mechanism for gdb to keep track of which
2253 sections should be considered to be mapped from the VMA to the LMA.
2254 This information is used for symbol lookup, and memory read/write.
2255 For instance, if a section has been mapped then its contents
2256 should be read from the VMA, otherwise from the LMA.
2258 Two levels of debugger support for overlays are available. One is
2259 "manual", in which the debugger relies on the user to tell it which
2260 overlays are currently mapped. This level of support is
2261 implemented entirely in the core debugger, and the information about
2262 whether a section is mapped is kept in the objfile->obj_section table.
2264 The second level of support is "automatic", and is only available if
2265 the target-specific code provides functionality to read the target's
2266 overlay mapping table, and translate its contents for the debugger
2267 (by updating the mapped state information in the obj_section tables).
2269 The interface is as follows:
2271 overlay map <name> -- tell gdb to consider this section mapped
2272 overlay unmap <name> -- tell gdb to consider this section unmapped
2273 overlay list -- list the sections that GDB thinks are mapped
2274 overlay read-target -- get the target's state of what's mapped
2275 overlay off/manual/auto -- set overlay debugging state
2276 Functional interface:
2277 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2278 section, return that section.
2279 find_pc_overlay(pc): find any overlay section that contains
2280 the pc, either in its VMA or its LMA
2281 overlay_is_mapped(sect): true if overlay is marked as mapped
2282 section_is_overlay(sect): true if section's VMA != LMA
2283 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2284 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2285 overlay_mapped_address(...): map an address from section's LMA to VMA
2286 overlay_unmapped_address(...): map an address from section's VMA to LMA
2287 symbol_overlayed_address(...): Return a "current" address for symbol:
2288 either in VMA or LMA depending on whether
2289 the symbol's section is currently mapped
2292 /* Overlay debugging state: */
2294 int overlay_debugging = 0; /* 0 == off, 1 == manual, -1 == auto */
2295 int overlay_cache_invalid = 0; /* True if need to refresh mapped state */
2297 /* Target vector for refreshing overlay mapped state */
2298 static void simple_overlay_update PARAMS ((struct obj_section *));
2299 void (*target_overlay_update) PARAMS ((struct obj_section *))
2300 = simple_overlay_update;
2302 /* Function: section_is_overlay (SECTION)
2303 Returns true if SECTION has VMA not equal to LMA, ie.
2304 SECTION is loaded at an address different from where it will "run". */
2307 section_is_overlay (section)
2310 if (overlay_debugging)
2311 if (section && section->lma != 0 &&
2312 section->vma != section->lma)
2318 /* Function: overlay_invalidate_all (void)
2319 Invalidate the mapped state of all overlay sections (mark it as stale). */
2322 overlay_invalidate_all ()
2324 struct objfile *objfile;
2325 struct obj_section *sect;
2327 ALL_OBJSECTIONS (objfile, sect)
2328 if (section_is_overlay (sect->the_bfd_section))
2329 sect->ovly_mapped = -1;
2332 /* Function: overlay_is_mapped (SECTION)
2333 Returns true if section is an overlay, and is currently mapped.
2334 Private: public access is thru function section_is_mapped.
2336 Access to the ovly_mapped flag is restricted to this function, so
2337 that we can do automatic update. If the global flag
2338 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2339 overlay_invalidate_all. If the mapped state of the particular
2340 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2343 overlay_is_mapped (osect)
2344 struct obj_section *osect;
2346 if (osect == 0 || !section_is_overlay (osect->the_bfd_section))
2349 switch (overlay_debugging)
2353 return 0; /* overlay debugging off */
2354 case -1: /* overlay debugging automatic */
2355 /* Unles there is a target_overlay_update function,
2356 there's really nothing useful to do here (can't really go auto) */
2357 if (target_overlay_update)
2359 if (overlay_cache_invalid)
2361 overlay_invalidate_all ();
2362 overlay_cache_invalid = 0;
2364 if (osect->ovly_mapped == -1)
2365 (*target_overlay_update) (osect);
2367 /* fall thru to manual case */
2368 case 1: /* overlay debugging manual */
2369 return osect->ovly_mapped == 1;
2373 /* Function: section_is_mapped
2374 Returns true if section is an overlay, and is currently mapped. */
2377 section_is_mapped (section)
2380 struct objfile *objfile;
2381 struct obj_section *osect;
2383 if (overlay_debugging)
2384 if (section && section_is_overlay (section))
2385 ALL_OBJSECTIONS (objfile, osect)
2386 if (osect->the_bfd_section == section)
2387 return overlay_is_mapped (osect);
2392 /* Function: pc_in_unmapped_range
2393 If PC falls into the lma range of SECTION, return true, else false. */
2396 pc_in_unmapped_range (pc, section)
2402 if (overlay_debugging)
2403 if (section && section_is_overlay (section))
2405 size = bfd_get_section_size_before_reloc (section);
2406 if (section->lma <= pc && pc < section->lma + size)
2412 /* Function: pc_in_mapped_range
2413 If PC falls into the vma range of SECTION, return true, else false. */
2416 pc_in_mapped_range (pc, section)
2422 if (overlay_debugging)
2423 if (section && section_is_overlay (section))
2425 size = bfd_get_section_size_before_reloc (section);
2426 if (section->vma <= pc && pc < section->vma + size)
2432 /* Function: overlay_unmapped_address (PC, SECTION)
2433 Returns the address corresponding to PC in the unmapped (load) range.
2434 May be the same as PC. */
2437 overlay_unmapped_address (pc, section)
2441 if (overlay_debugging)
2442 if (section && section_is_overlay (section) &&
2443 pc_in_mapped_range (pc, section))
2444 return pc + section->lma - section->vma;
2449 /* Function: overlay_mapped_address (PC, SECTION)
2450 Returns the address corresponding to PC in the mapped (runtime) range.
2451 May be the same as PC. */
2454 overlay_mapped_address (pc, section)
2458 if (overlay_debugging)
2459 if (section && section_is_overlay (section) &&
2460 pc_in_unmapped_range (pc, section))
2461 return pc + section->vma - section->lma;
2467 /* Function: symbol_overlayed_address
2468 Return one of two addresses (relative to the VMA or to the LMA),
2469 depending on whether the section is mapped or not. */
2472 symbol_overlayed_address (address, section)
2476 if (overlay_debugging)
2478 /* If the symbol has no section, just return its regular address. */
2481 /* If the symbol's section is not an overlay, just return its address */
2482 if (!section_is_overlay (section))
2484 /* If the symbol's section is mapped, just return its address */
2485 if (section_is_mapped (section))
2488 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
2489 * then return its LOADED address rather than its vma address!!
2491 return overlay_unmapped_address (address, section);
2496 /* Function: find_pc_overlay (PC)
2497 Return the best-match overlay section for PC:
2498 If PC matches a mapped overlay section's VMA, return that section.
2499 Else if PC matches an unmapped section's VMA, return that section.
2500 Else if PC matches an unmapped section's LMA, return that section. */
2503 find_pc_overlay (pc)
2506 struct objfile *objfile;
2507 struct obj_section *osect, *best_match = NULL;
2509 if (overlay_debugging)
2510 ALL_OBJSECTIONS (objfile, osect)
2511 if (section_is_overlay (osect->the_bfd_section))
2513 if (pc_in_mapped_range (pc, osect->the_bfd_section))
2515 if (overlay_is_mapped (osect))
2516 return osect->the_bfd_section;
2520 else if (pc_in_unmapped_range (pc, osect->the_bfd_section))
2523 return best_match ? best_match->the_bfd_section : NULL;
2526 /* Function: find_pc_mapped_section (PC)
2527 If PC falls into the VMA address range of an overlay section that is
2528 currently marked as MAPPED, return that section. Else return NULL. */
2531 find_pc_mapped_section (pc)
2534 struct objfile *objfile;
2535 struct obj_section *osect;
2537 if (overlay_debugging)
2538 ALL_OBJSECTIONS (objfile, osect)
2539 if (pc_in_mapped_range (pc, osect->the_bfd_section) &&
2540 overlay_is_mapped (osect))
2541 return osect->the_bfd_section;
2546 /* Function: list_overlays_command
2547 Print a list of mapped sections and their PC ranges */
2550 list_overlays_command (args, from_tty)
2555 struct objfile *objfile;
2556 struct obj_section *osect;
2558 if (overlay_debugging)
2559 ALL_OBJSECTIONS (objfile, osect)
2560 if (overlay_is_mapped (osect))
2566 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
2567 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
2568 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2569 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
2571 printf_filtered ("Section %s, loaded at ", name);
2572 print_address_numeric (lma, 1, gdb_stdout);
2573 puts_filtered (" - ");
2574 print_address_numeric (lma + size, 1, gdb_stdout);
2575 printf_filtered (", mapped at ");
2576 print_address_numeric (vma, 1, gdb_stdout);
2577 puts_filtered (" - ");
2578 print_address_numeric (vma + size, 1, gdb_stdout);
2579 puts_filtered ("\n");
2584 printf_filtered ("No sections are mapped.\n");
2587 /* Function: map_overlay_command
2588 Mark the named section as mapped (ie. residing at its VMA address). */
2591 map_overlay_command (args, from_tty)
2595 struct objfile *objfile, *objfile2;
2596 struct obj_section *sec, *sec2;
2599 if (!overlay_debugging)
2600 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2602 if (args == 0 || *args == 0)
2603 error ("Argument required: name of an overlay section");
2605 /* First, find a section matching the user supplied argument */
2606 ALL_OBJSECTIONS (objfile, sec)
2607 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
2609 /* Now, check to see if the section is an overlay. */
2610 bfdsec = sec->the_bfd_section;
2611 if (!section_is_overlay (bfdsec))
2612 continue; /* not an overlay section */
2614 /* Mark the overlay as "mapped" */
2615 sec->ovly_mapped = 1;
2617 /* Next, make a pass and unmap any sections that are
2618 overlapped by this new section: */
2619 ALL_OBJSECTIONS (objfile2, sec2)
2620 if (sec2->ovly_mapped &&
2622 sec->the_bfd_section != sec2->the_bfd_section &&
2623 (pc_in_mapped_range (sec2->addr, sec->the_bfd_section) ||
2624 pc_in_mapped_range (sec2->endaddr, sec->the_bfd_section)))
2627 printf_filtered ("Note: section %s unmapped by overlap\n",
2628 bfd_section_name (objfile->obfd,
2629 sec2->the_bfd_section));
2630 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2 */
2634 error ("No overlay section called %s", args);
2637 /* Function: unmap_overlay_command
2638 Mark the overlay section as unmapped
2639 (ie. resident in its LMA address range, rather than the VMA range). */
2642 unmap_overlay_command (args, from_tty)
2646 struct objfile *objfile;
2647 struct obj_section *sec;
2649 if (!overlay_debugging)
2650 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2652 if (args == 0 || *args == 0)
2653 error ("Argument required: name of an overlay section");
2655 /* First, find a section matching the user supplied argument */
2656 ALL_OBJSECTIONS (objfile, sec)
2657 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
2659 if (!sec->ovly_mapped)
2660 error ("Section %s is not mapped", args);
2661 sec->ovly_mapped = 0;
2664 error ("No overlay section called %s", args);
2667 /* Function: overlay_auto_command
2668 A utility command to turn on overlay debugging.
2669 Possibly this should be done via a set/show command. */
2672 overlay_auto_command (args, from_tty)
2676 overlay_debugging = -1;
2678 printf_filtered ("Automatic overlay debugging enabled.");
2681 /* Function: overlay_manual_command
2682 A utility command to turn on overlay debugging.
2683 Possibly this should be done via a set/show command. */
2686 overlay_manual_command (args, from_tty)
2690 overlay_debugging = 1;
2692 printf_filtered ("Overlay debugging enabled.");
2695 /* Function: overlay_off_command
2696 A utility command to turn on overlay debugging.
2697 Possibly this should be done via a set/show command. */
2700 overlay_off_command (args, from_tty)
2704 overlay_debugging = 0;
2706 printf_filtered ("Overlay debugging disabled.");
2710 overlay_load_command (args, from_tty)
2714 if (target_overlay_update)
2715 (*target_overlay_update) (NULL);
2717 error ("This target does not know how to read its overlay state.");
2720 /* Function: overlay_command
2721 A place-holder for a mis-typed command */
2723 /* Command list chain containing all defined "overlay" subcommands. */
2724 struct cmd_list_element *overlaylist;
2727 overlay_command (args, from_tty)
2732 ("\"overlay\" must be followed by the name of an overlay command.\n");
2733 help_list (overlaylist, "overlay ", -1, gdb_stdout);
2737 /* Target Overlays for the "Simplest" overlay manager:
2739 This is GDB's default target overlay layer. It works with the
2740 minimal overlay manager supplied as an example by Cygnus. The
2741 entry point is via a function pointer "target_overlay_update",
2742 so targets that use a different runtime overlay manager can
2743 substitute their own overlay_update function and take over the
2746 The overlay_update function pokes around in the target's data structures
2747 to see what overlays are mapped, and updates GDB's overlay mapping with
2750 In this simple implementation, the target data structures are as follows:
2751 unsigned _novlys; /# number of overlay sections #/
2752 unsigned _ovly_table[_novlys][4] = {
2753 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
2754 {..., ..., ..., ...},
2756 unsigned _novly_regions; /# number of overlay regions #/
2757 unsigned _ovly_region_table[_novly_regions][3] = {
2758 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
2761 These functions will attempt to update GDB's mappedness state in the
2762 symbol section table, based on the target's mappedness state.
2764 To do this, we keep a cached copy of the target's _ovly_table, and
2765 attempt to detect when the cached copy is invalidated. The main
2766 entry point is "simple_overlay_update(SECT), which looks up SECT in
2767 the cached table and re-reads only the entry for that section from
2768 the target (whenever possible).
2771 /* Cached, dynamically allocated copies of the target data structures: */
2772 static unsigned (*cache_ovly_table)[4] = 0;
2774 static unsigned (*cache_ovly_region_table)[3] = 0;
2776 static unsigned cache_novlys = 0;
2778 static unsigned cache_novly_regions = 0;
2780 static CORE_ADDR cache_ovly_table_base = 0;
2782 static CORE_ADDR cache_ovly_region_table_base = 0;
2786 VMA, SIZE, LMA, MAPPED
2788 #define TARGET_LONG_BYTES (TARGET_LONG_BIT / TARGET_CHAR_BIT)
2790 /* Throw away the cached copy of _ovly_table */
2792 simple_free_overlay_table ()
2794 if (cache_ovly_table)
2795 free (cache_ovly_table);
2797 cache_ovly_table = NULL;
2798 cache_ovly_table_base = 0;
2802 /* Throw away the cached copy of _ovly_region_table */
2804 simple_free_overlay_region_table ()
2806 if (cache_ovly_region_table)
2807 free (cache_ovly_region_table);
2808 cache_novly_regions = 0;
2809 cache_ovly_region_table = NULL;
2810 cache_ovly_region_table_base = 0;
2814 /* Read an array of ints from the target into a local buffer.
2815 Convert to host order. int LEN is number of ints */
2817 read_target_long_array (memaddr, myaddr, len)
2819 unsigned int *myaddr;
2822 char *buf = alloca (len * TARGET_LONG_BYTES);
2825 read_memory (memaddr, buf, len * TARGET_LONG_BYTES);
2826 for (i = 0; i < len; i++)
2827 myaddr[i] = extract_unsigned_integer (TARGET_LONG_BYTES * i + buf,
2831 /* Find and grab a copy of the target _ovly_table
2832 (and _novlys, which is needed for the table's size) */
2834 simple_read_overlay_table ()
2836 struct minimal_symbol *msym;
2838 simple_free_overlay_table ();
2839 msym = lookup_minimal_symbol ("_novlys", 0, 0);
2841 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
2843 return 0; /* failure */
2844 cache_ovly_table = (void *) xmalloc (cache_novlys * sizeof (*cache_ovly_table));
2845 if (cache_ovly_table != NULL)
2847 msym = lookup_minimal_symbol ("_ovly_table", 0, 0);
2850 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (msym);
2851 read_target_long_array (cache_ovly_table_base,
2852 (int *) cache_ovly_table,
2856 return 0; /* failure */
2859 return 0; /* failure */
2860 return 1; /* SUCCESS */
2864 /* Find and grab a copy of the target _ovly_region_table
2865 (and _novly_regions, which is needed for the table's size) */
2867 simple_read_overlay_region_table ()
2869 struct minimal_symbol *msym;
2871 simple_free_overlay_region_table ();
2872 msym = lookup_minimal_symbol ("_novly_regions", 0, 0);
2874 cache_novly_regions = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
2876 return 0; /* failure */
2877 cache_ovly_region_table = (void *) xmalloc (cache_novly_regions * 12);
2878 if (cache_ovly_region_table != NULL)
2880 msym = lookup_minimal_symbol ("_ovly_region_table", 0, 0);
2883 cache_ovly_region_table_base = SYMBOL_VALUE_ADDRESS (msym);
2884 read_target_long_array (cache_ovly_region_table_base,
2885 (int *) cache_ovly_region_table,
2886 cache_novly_regions * 3);
2889 return 0; /* failure */
2892 return 0; /* failure */
2893 return 1; /* SUCCESS */
2897 /* Function: simple_overlay_update_1
2898 A helper function for simple_overlay_update. Assuming a cached copy
2899 of _ovly_table exists, look through it to find an entry whose vma,
2900 lma and size match those of OSECT. Re-read the entry and make sure
2901 it still matches OSECT (else the table may no longer be valid).
2902 Set OSECT's mapped state to match the entry. Return: 1 for
2903 success, 0 for failure. */
2906 simple_overlay_update_1 (osect)
2907 struct obj_section *osect;
2911 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2912 for (i = 0; i < cache_novlys; i++)
2913 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
2914 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
2915 cache_ovly_table[i][SIZE] == size */ )
2917 read_target_long_array (cache_ovly_table_base + i * TARGET_LONG_BYTES,
2918 (int *) cache_ovly_table[i], 4);
2919 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
2920 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
2921 cache_ovly_table[i][SIZE] == size */ )
2923 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
2926 else /* Warning! Warning! Target's ovly table has changed! */
2932 /* Function: simple_overlay_update
2933 If OSECT is NULL, then update all sections' mapped state
2934 (after re-reading the entire target _ovly_table).
2935 If OSECT is non-NULL, then try to find a matching entry in the
2936 cached ovly_table and update only OSECT's mapped state.
2937 If a cached entry can't be found or the cache isn't valid, then
2938 re-read the entire cache, and go ahead and update all sections. */
2941 simple_overlay_update (osect)
2942 struct obj_section *osect;
2944 struct objfile *objfile;
2946 /* Were we given an osect to look up? NULL means do all of them. */
2948 /* Have we got a cached copy of the target's overlay table? */
2949 if (cache_ovly_table != NULL)
2950 /* Does its cached location match what's currently in the symtab? */
2951 if (cache_ovly_table_base ==
2952 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", 0, 0)))
2953 /* Then go ahead and try to look up this single section in the cache */
2954 if (simple_overlay_update_1 (osect))
2955 /* Found it! We're done. */
2958 /* Cached table no good: need to read the entire table anew.
2959 Or else we want all the sections, in which case it's actually
2960 more efficient to read the whole table in one block anyway. */
2962 if (simple_read_overlay_table () == 0) /* read failed? No table? */
2964 warning ("Failed to read the target overlay mapping table.");
2967 /* Now may as well update all sections, even if only one was requested. */
2968 ALL_OBJSECTIONS (objfile, osect)
2969 if (section_is_overlay (osect->the_bfd_section))
2973 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2974 for (i = 0; i < cache_novlys; i++)
2975 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
2976 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
2977 cache_ovly_table[i][SIZE] == size */ )
2978 { /* obj_section matches i'th entry in ovly_table */
2979 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
2980 break; /* finished with inner for loop: break out */
2987 _initialize_symfile ()
2989 struct cmd_list_element *c;
2991 c = add_cmd ("symbol-file", class_files, symbol_file_command,
2992 "Load symbol table from executable file FILE.\n\
2993 The `file' command can also load symbol tables, as well as setting the file\n\
2994 to execute.", &cmdlist);
2995 c->completer = filename_completer;
2997 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command,
2998 "Usage: add-symbol-file FILE ADDR\n\
2999 Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
3000 ADDR is the starting address of the file's text.",
3002 c->completer = filename_completer;
3004 c = add_cmd ("add-shared-symbol-files", class_files,
3005 add_shared_symbol_files_command,
3006 "Load the symbols from shared objects in the dynamic linker's link map.",
3008 c = add_alias_cmd ("assf", "add-shared-symbol-files", class_files, 1,
3011 c = add_cmd ("load", class_files, load_command,
3012 "Dynamically load FILE into the running program, and record its symbols\n\
3013 for access from GDB.", &cmdlist);
3014 c->completer = filename_completer;
3017 (add_set_cmd ("symbol-reloading", class_support, var_boolean,
3018 (char *) &symbol_reloading,
3019 "Set dynamic symbol table reloading multiple times in one run.",
3023 add_prefix_cmd ("overlay", class_support, overlay_command,
3024 "Commands for debugging overlays.", &overlaylist,
3025 "overlay ", 0, &cmdlist);
3027 add_com_alias ("ovly", "overlay", class_alias, 1);
3028 add_com_alias ("ov", "overlay", class_alias, 1);
3030 add_cmd ("map-overlay", class_support, map_overlay_command,
3031 "Assert that an overlay section is mapped.", &overlaylist);
3033 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
3034 "Assert that an overlay section is unmapped.", &overlaylist);
3036 add_cmd ("list-overlays", class_support, list_overlays_command,
3037 "List mappings of overlay sections.", &overlaylist);
3039 add_cmd ("manual", class_support, overlay_manual_command,
3040 "Enable overlay debugging.", &overlaylist);
3041 add_cmd ("off", class_support, overlay_off_command,
3042 "Disable overlay debugging.", &overlaylist);
3043 add_cmd ("auto", class_support, overlay_auto_command,
3044 "Enable automatic overlay debugging.", &overlaylist);
3045 add_cmd ("load-target", class_support, overlay_load_command,
3046 "Read the overlay mapping state from the target.", &overlaylist);
3048 /* Filename extension to source language lookup table: */
3049 init_filename_language_table ();
3050 c = add_set_cmd ("extension-language", class_files, var_string_noescape,
3052 "Set mapping between filename extension and source language.\n\
3053 Usage: set extension-language .foo bar",
3055 c->function.cfunc = set_ext_lang_command;
3057 add_info ("extensions", info_ext_lang_command,
3058 "All filename extensions associated with a source language.");