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, Boston, MA 02111-1307, USA. */
32 #include "breakpoint.h"
34 #include "complaints.h"
36 #include "inferior.h" /* for write_pc */
37 #include "gdb-stabs.h"
41 #include <sys/types.h>
43 #include "gdb_string.h"
57 /* Some HP-UX related globals to clear when a new "main"
58 symbol file is loaded. HP-specific. */
60 extern int hp_som_som_object_present;
61 extern int hp_cxx_exception_support_initialized;
62 #define RESET_HP_UX_GLOBALS() do {\
63 hp_som_som_object_present = 0; /* indicates HP-compiled code */ \
64 hp_cxx_exception_support_initialized = 0; /* must reinitialize exception stuff */ \
68 int (*ui_load_progress_hook) PARAMS ((char *, unsigned long));
69 void (*pre_add_symbol_hook) PARAMS ((char *));
70 void (*post_add_symbol_hook) PARAMS ((void));
72 /* Global variables owned by this file */
73 int readnow_symbol_files; /* Read full symbols immediately */
75 struct complaint oldsyms_complaint = {
76 "Replacing old symbols for `%s'", 0, 0
79 struct complaint empty_symtab_complaint = {
80 "Empty symbol table found for `%s'", 0, 0
83 /* External variables and functions referenced. */
85 extern int info_verbose;
87 extern void report_transfer_performance PARAMS ((unsigned long,
90 /* Functions this file defines */
93 static int simple_read_overlay_region_table PARAMS ((void));
94 static void simple_free_overlay_region_table PARAMS ((void));
97 static void set_initial_language PARAMS ((void));
99 static void load_command PARAMS ((char *, int));
101 static void add_symbol_file_command PARAMS ((char *, int));
103 static void add_shared_symbol_files_command PARAMS ((char *, int));
105 static void cashier_psymtab PARAMS ((struct partial_symtab *));
107 static int compare_psymbols PARAMS ((const void *, const void *));
109 static int compare_symbols PARAMS ((const void *, const void *));
111 bfd *symfile_bfd_open PARAMS ((char *));
113 static void find_sym_fns PARAMS ((struct objfile *));
115 static void decrement_reading_symtab PARAMS ((void *));
117 static void overlay_invalidate_all PARAMS ((void));
119 static int overlay_is_mapped PARAMS ((struct obj_section *));
121 void list_overlays_command PARAMS ((char *, int));
123 void map_overlay_command PARAMS ((char *, int));
125 void unmap_overlay_command PARAMS ((char *, int));
127 static void overlay_auto_command PARAMS ((char *, int));
129 static void overlay_manual_command PARAMS ((char *, int));
131 static void overlay_off_command PARAMS ((char *, int));
133 static void overlay_load_command PARAMS ((char *, int));
135 static void overlay_command PARAMS ((char *, int));
137 static void simple_free_overlay_table PARAMS ((void));
139 static void read_target_long_array PARAMS ((CORE_ADDR, unsigned int *, int));
141 static int simple_read_overlay_table PARAMS ((void));
143 static int simple_overlay_update_1 PARAMS ((struct obj_section *));
145 void _initialize_symfile PARAMS ((void));
147 /* List of all available sym_fns. On gdb startup, each object file reader
148 calls add_symtab_fns() to register information on each format it is
151 static struct sym_fns *symtab_fns = NULL;
153 /* Flag for whether user will be reloading symbols multiple times.
154 Defaults to ON for VxWorks, otherwise OFF. */
156 #ifdef SYMBOL_RELOADING_DEFAULT
157 int symbol_reloading = SYMBOL_RELOADING_DEFAULT;
159 int symbol_reloading = 0;
162 /* If non-zero, then on HP-UX (i.e., platforms that use somsolib.c),
163 this variable is interpreted as a threshhold. If adding a new
164 library's symbol table to those already known to the debugger would
165 exceed this threshhold, then the shlib's symbols are not added.
167 If non-zero on other platforms, shared library symbols will be added
168 automatically when the inferior is created, new libraries are loaded,
169 or when attaching to the inferior. This is almost always what users
170 will want to have happen; but for very large programs, the startup
171 time will be excessive, and so if this is a problem, the user can
172 clear this flag and then add the shared library symbols as needed.
173 Note that there is a potential for confusion, since if the shared
174 library symbols are not loaded, commands like "info fun" will *not*
175 report all the functions that are actually present.
177 Note that HP-UX interprets this variable to mean, "threshhold size
178 in megabytes, where zero means never add". Other platforms interpret
179 this variable to mean, "always add if non-zero, never add if zero."
182 int auto_solib_add = 1;
185 /* Since this function is called from within qsort, in an ANSI environment
186 it must conform to the prototype for qsort, which specifies that the
187 comparison function takes two "void *" pointers. */
190 compare_symbols (s1p, s2p)
194 register struct symbol **s1, **s2;
196 s1 = (struct symbol **) s1p;
197 s2 = (struct symbol **) s2p;
199 return (STRCMP (SYMBOL_NAME (*s1), SYMBOL_NAME (*s2)));
206 compare_psymbols -- compare two partial symbols by name
210 Given pointers to pointers to two partial symbol table entries,
211 compare them by name and return -N, 0, or +N (ala strcmp).
212 Typically used by sorting routines like qsort().
216 Does direct compare of first two characters before punting
217 and passing to strcmp for longer compares. Note that the
218 original version had a bug whereby two null strings or two
219 identically named one character strings would return the
220 comparison of memory following the null byte.
225 compare_psymbols (s1p, s2p)
229 register char *st1 = SYMBOL_NAME (*(struct partial_symbol **) s1p);
230 register char *st2 = SYMBOL_NAME (*(struct partial_symbol **) s2p);
232 if ((st1[0] - st2[0]) || !st1[0])
234 return (st1[0] - st2[0]);
236 else if ((st1[1] - st2[1]) || !st1[1])
238 return (st1[1] - st2[1]);
242 /* Note: I replaced the STRCMP line (commented out below)
243 * with a simpler "strcmp()" which compares the 2 strings
244 * from the beginning. (STRCMP is a macro which first compares
245 * the initial characters, then falls back on strcmp).
246 * The reason is that the STRCMP line was tickling a C compiler
247 * bug on HP-UX 10.30, which is avoided with the simpler
248 * code. The performance gain from the more complicated code
249 * is negligible, given that we have already checked the
250 * initial 2 characters above. I reported the compiler bug,
251 * and once it is fixed the original line can be put back. RT
253 /* return ( STRCMP (st1 + 2, st2 + 2)); */
254 return ( strcmp (st1, st2));
259 sort_pst_symbols (pst)
260 struct partial_symtab *pst;
262 /* Sort the global list; don't sort the static list */
264 qsort (pst -> objfile -> global_psymbols.list + pst -> globals_offset,
265 pst -> n_global_syms, sizeof (struct partial_symbol *),
269 /* Call sort_block_syms to sort alphabetically the symbols of one block. */
273 register struct block *b;
275 qsort (&BLOCK_SYM (b, 0), BLOCK_NSYMS (b),
276 sizeof (struct symbol *), compare_symbols);
279 /* Call sort_symtab_syms to sort alphabetically
280 the symbols of each block of one symtab. */
284 register struct symtab *s;
286 register struct blockvector *bv;
289 register struct block *b;
293 bv = BLOCKVECTOR (s);
294 nbl = BLOCKVECTOR_NBLOCKS (bv);
295 for (i = 0; i < nbl; i++)
297 b = BLOCKVECTOR_BLOCK (bv, i);
298 if (BLOCK_SHOULD_SORT (b))
303 /* Make a null terminated copy of the string at PTR with SIZE characters in
304 the obstack pointed to by OBSTACKP . Returns the address of the copy.
305 Note that the string at PTR does not have to be null terminated, I.E. it
306 may be part of a larger string and we are only saving a substring. */
309 obsavestring (ptr, size, obstackp)
312 struct obstack *obstackp;
314 register char *p = (char *) obstack_alloc (obstackp, size + 1);
315 /* Open-coded memcpy--saves function call time. These strings are usually
316 short. FIXME: Is this really still true with a compiler that can
319 register char *p1 = ptr;
320 register char *p2 = p;
321 char *end = ptr + size;
329 /* Concatenate strings S1, S2 and S3; return the new string. Space is found
330 in the obstack pointed to by OBSTACKP. */
333 obconcat (obstackp, s1, s2, s3)
334 struct obstack *obstackp;
335 const char *s1, *s2, *s3;
337 register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1;
338 register char *val = (char *) obstack_alloc (obstackp, len);
345 /* True if we are nested inside psymtab_to_symtab. */
347 int currently_reading_symtab = 0;
350 decrement_reading_symtab (dummy)
353 currently_reading_symtab--;
356 /* Get the symbol table that corresponds to a partial_symtab.
357 This is fast after the first time you do it. In fact, there
358 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
362 psymtab_to_symtab (pst)
363 register struct partial_symtab *pst;
365 /* If it's been looked up before, return it. */
369 /* If it has not yet been read in, read it. */
372 struct cleanup *back_to = make_cleanup (decrement_reading_symtab, NULL);
373 currently_reading_symtab++;
374 (*pst->read_symtab) (pst);
375 do_cleanups (back_to);
381 /* Initialize entry point information for this objfile. */
384 init_entry_point_info (objfile)
385 struct objfile *objfile;
387 /* Save startup file's range of PC addresses to help blockframe.c
388 decide where the bottom of the stack is. */
390 if (bfd_get_file_flags (objfile -> obfd) & EXEC_P)
392 /* Executable file -- record its entry point so we'll recognize
393 the startup file because it contains the entry point. */
394 objfile -> ei.entry_point = bfd_get_start_address (objfile -> obfd);
398 /* Examination of non-executable.o files. Short-circuit this stuff. */
399 objfile -> ei.entry_point = INVALID_ENTRY_POINT;
401 objfile -> ei.entry_file_lowpc = INVALID_ENTRY_LOWPC;
402 objfile -> ei.entry_file_highpc = INVALID_ENTRY_HIGHPC;
403 objfile -> ei.entry_func_lowpc = INVALID_ENTRY_LOWPC;
404 objfile -> ei.entry_func_highpc = INVALID_ENTRY_HIGHPC;
405 objfile -> ei.main_func_lowpc = INVALID_ENTRY_LOWPC;
406 objfile -> ei.main_func_highpc = INVALID_ENTRY_HIGHPC;
409 /* Get current entry point address. */
412 entry_point_address()
414 return symfile_objfile ? symfile_objfile->ei.entry_point : 0;
417 /* Remember the lowest-addressed loadable section we've seen.
418 This function is called via bfd_map_over_sections.
420 In case of equal vmas, the section with the largest size becomes the
421 lowest-addressed loadable section.
423 If the vmas and sizes are equal, the last section is considered the
424 lowest-addressed loadable section. */
427 find_lowest_section (abfd, sect, obj)
432 asection **lowest = (asection **)obj;
434 if (0 == (bfd_get_section_flags (abfd, sect) & SEC_LOAD))
437 *lowest = sect; /* First loadable section */
438 else if (bfd_section_vma (abfd, *lowest) > bfd_section_vma (abfd, sect))
439 *lowest = sect; /* A lower loadable section */
440 else if (bfd_section_vma (abfd, *lowest) == bfd_section_vma (abfd, sect)
441 && (bfd_section_size (abfd, (*lowest))
442 <= bfd_section_size (abfd, sect)))
446 /* Parse the user's idea of an offset for dynamic linking, into our idea
447 of how to represent it for fast symbol reading. This is the default
448 version of the sym_fns.sym_offsets function for symbol readers that
449 don't need to do anything special. It allocates a section_offsets table
450 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
452 struct section_offsets *
453 default_symfile_offsets (objfile, addr)
454 struct objfile *objfile;
457 struct section_offsets *section_offsets;
460 objfile->num_sections = SECT_OFF_MAX;
461 section_offsets = (struct section_offsets *)
462 obstack_alloc (&objfile -> psymbol_obstack, SIZEOF_SECTION_OFFSETS);
464 for (i = 0; i < SECT_OFF_MAX; i++)
465 ANOFFSET (section_offsets, i) = addr;
467 return section_offsets;
471 /* Process a symbol file, as either the main file or as a dynamically
474 NAME is the file name (which will be tilde-expanded and made
475 absolute herein) (but we don't free or modify NAME itself).
476 FROM_TTY says how verbose to be. MAINLINE specifies whether this
477 is the main symbol file, or whether it's an extra symbol file such
478 as dynamically loaded code. If !mainline, ADDR is the address
479 where the text segment was loaded. If VERBO, the caller has printed
480 a verbose message about the symbol reading (and complaints can be
481 more terse about it). */
484 syms_from_objfile (objfile, addr, mainline, verbo)
485 struct objfile *objfile;
490 struct section_offsets *section_offsets;
491 asection *lowest_sect;
492 struct cleanup *old_chain;
494 init_entry_point_info (objfile);
495 find_sym_fns (objfile);
497 /* Make sure that partially constructed symbol tables will be cleaned up
498 if an error occurs during symbol reading. */
499 old_chain = make_cleanup ((make_cleanup_func) free_objfile, objfile);
503 /* We will modify the main symbol table, make sure that all its users
504 will be cleaned up if an error occurs during symbol reading. */
505 make_cleanup ((make_cleanup_func) clear_symtab_users, 0);
507 /* Since no error yet, throw away the old symbol table. */
509 if (symfile_objfile != NULL)
511 free_objfile (symfile_objfile);
512 symfile_objfile = NULL;
515 /* Currently we keep symbols from the add-symbol-file command.
516 If the user wants to get rid of them, they should do "symbol-file"
517 without arguments first. Not sure this is the best behavior
520 (*objfile -> sf -> sym_new_init) (objfile);
523 /* Convert addr into an offset rather than an absolute address.
524 We find the lowest address of a loaded segment in the objfile,
525 and assume that <addr> is where that got loaded. Due to historical
526 precedent, we warn if that doesn't happen to be a text segment. */
530 addr = 0; /* No offset from objfile addresses. */
534 lowest_sect = bfd_get_section_by_name (objfile->obfd, ".text");
535 if (lowest_sect == NULL)
536 bfd_map_over_sections (objfile->obfd, find_lowest_section,
539 if (lowest_sect == NULL)
540 warning ("no loadable sections found in added symbol-file %s",
542 else if ((bfd_get_section_flags (objfile->obfd, lowest_sect) & SEC_CODE)
544 /* FIXME-32x64--assumes bfd_vma fits in long. */
545 warning ("Lowest section in %s is %s at 0x%lx",
547 bfd_section_name (objfile->obfd, lowest_sect),
548 (unsigned long) bfd_section_vma (objfile->obfd, lowest_sect));
551 addr -= bfd_section_vma (objfile->obfd, lowest_sect);
554 /* Initialize symbol reading routines for this objfile, allow complaints to
555 appear for this new file, and record how verbose to be, then do the
556 initial symbol reading for this file. */
558 (*objfile -> sf -> sym_init) (objfile);
559 clear_complaints (1, verbo);
561 section_offsets = (*objfile -> sf -> sym_offsets) (objfile, addr);
562 objfile->section_offsets = section_offsets;
564 #ifndef IBM6000_TARGET
565 /* This is a SVR4/SunOS specific hack, I think. In any event, it
566 screws RS/6000. sym_offsets should be doing this sort of thing,
567 because it knows the mapping between bfd sections and
569 /* This is a hack. As far as I can tell, section offsets are not
570 target dependent. They are all set to addr with a couple of
571 exceptions. The exceptions are sysvr4 shared libraries, whose
572 offsets are kept in solib structures anyway and rs6000 xcoff
573 which handles shared libraries in a completely unique way.
575 Section offsets are built similarly, except that they are built
576 by adding addr in all cases because there is no clear mapping
577 from section_offsets into actual sections. Note that solib.c
578 has a different algorythm for finding section offsets.
580 These should probably all be collapsed into some target
581 independent form of shared library support. FIXME. */
585 struct obj_section *s;
587 for (s = objfile->sections; s < objfile->sections_end; ++s)
589 s->addr -= s->offset;
591 s->endaddr -= s->offset;
596 #endif /* not IBM6000_TARGET */
598 (*objfile -> sf -> sym_read) (objfile, section_offsets, mainline);
600 if (!have_partial_symbols () && !have_full_symbols ())
603 printf_filtered ("(no debugging symbols found)...");
607 /* Don't allow char * to have a typename (else would get caddr_t).
608 Ditto void *. FIXME: Check whether this is now done by all the
609 symbol readers themselves (many of them now do), and if so remove
612 TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0;
613 TYPE_NAME (lookup_pointer_type (builtin_type_void)) = 0;
615 /* Mark the objfile has having had initial symbol read attempted. Note
616 that this does not mean we found any symbols... */
618 objfile -> flags |= OBJF_SYMS;
620 /* Discard cleanups as symbol reading was successful. */
622 discard_cleanups (old_chain);
624 /* Call this after reading in a new symbol table to give target dependant code
625 a crack at the new symbols. For instance, this could be used to update the
626 values of target-specific symbols GDB needs to keep track of (such as
627 _sigtramp, or whatever). */
629 TARGET_SYMFILE_POSTREAD (objfile);
632 /* Perform required actions after either reading in the initial
633 symbols for a new objfile, or mapping in the symbols from a reusable
637 new_symfile_objfile (objfile, mainline, verbo)
638 struct objfile *objfile;
643 /* If this is the main symbol file we have to clean up all users of the
644 old main symbol file. Otherwise it is sufficient to fixup all the
645 breakpoints that may have been redefined by this symbol file. */
648 /* OK, make it the "real" symbol file. */
649 symfile_objfile = objfile;
651 clear_symtab_users ();
655 breakpoint_re_set ();
658 /* We're done reading the symbol file; finish off complaints. */
659 clear_complaints (0, verbo);
662 /* Process a symbol file, as either the main file or as a dynamically
665 NAME is the file name (which will be tilde-expanded and made
666 absolute herein) (but we don't free or modify NAME itself).
667 FROM_TTY says how verbose to be. MAINLINE specifies whether this
668 is the main symbol file, or whether it's an extra symbol file such
669 as dynamically loaded code. If !mainline, ADDR is the address
670 where the text segment was loaded.
672 USER_LOADED is TRUE if the add-symbol-file command was how this
673 symbol file came to be processed.
675 IS_SOLIB is TRUE if this symbol file represents a solib, as discovered
676 by the target's implementation of the solib package.
678 Upon success, returns a pointer to the objfile that was added.
679 Upon failure, jumps back to command level (never returns). */
682 symbol_file_add (name, from_tty, addr, mainline, mapped, readnow, user_loaded, is_solib)
692 struct objfile *objfile;
693 struct partial_symtab *psymtab;
696 /* Open a bfd for the file, and give user a chance to burp if we'd be
697 interactively wiping out any existing symbols. */
699 abfd = symfile_bfd_open (name);
701 if ((have_full_symbols () || have_partial_symbols ())
704 && !query ("Load new symbol table from \"%s\"? ", name))
705 error ("Not confirmed.");
707 objfile = allocate_objfile (abfd, mapped, user_loaded, is_solib);
709 /* If the objfile uses a mapped symbol file, and we have a psymtab for
710 it, then skip reading any symbols at this time. */
712 if ((objfile -> flags & OBJF_MAPPED) && (objfile -> flags & OBJF_SYMS))
714 /* We mapped in an existing symbol table file that already has had
715 initial symbol reading performed, so we can skip that part. Notify
716 the user that instead of reading the symbols, they have been mapped.
718 if (from_tty || info_verbose)
720 printf_filtered ("Mapped symbols for %s...", name);
722 gdb_flush (gdb_stdout);
724 init_entry_point_info (objfile);
725 find_sym_fns (objfile);
729 /* We either created a new mapped symbol table, mapped an existing
730 symbol table file which has not had initial symbol reading
731 performed, or need to read an unmapped symbol table. */
732 if (from_tty || info_verbose)
734 if (pre_add_symbol_hook)
735 pre_add_symbol_hook (name);
738 printf_filtered ("Reading symbols from %s...", name);
740 gdb_flush (gdb_stdout);
743 syms_from_objfile (objfile, addr, mainline, from_tty);
746 /* We now have at least a partial symbol table. Check to see if the
747 user requested that all symbols be read on initial access via either
748 the gdb startup command line or on a per symbol file basis. Expand
749 all partial symbol tables for this objfile if so. */
751 if (readnow || readnow_symbol_files)
753 if (from_tty || info_verbose)
755 printf_filtered ("expanding to full symbols...");
757 gdb_flush (gdb_stdout);
760 for (psymtab = objfile -> psymtabs;
762 psymtab = psymtab -> next)
764 psymtab_to_symtab (psymtab);
768 if (from_tty || info_verbose)
770 if (post_add_symbol_hook)
771 post_add_symbol_hook ();
774 printf_filtered ("done.\n");
775 gdb_flush (gdb_stdout);
779 new_symfile_objfile (objfile, mainline, from_tty);
781 target_new_objfile (objfile);
786 /* This is the symbol-file command. Read the file, analyze its
787 symbols, and add a struct symtab to a symtab list. The syntax of
788 the command is rather bizarre--(1) buildargv implements various
789 quoting conventions which are undocumented and have little or
790 nothing in common with the way things are quoted (or not quoted)
791 elsewhere in GDB, (2) options are used, which are not generally
792 used in GDB (perhaps "set mapped on", "set readnow on" would be
793 better), (3) the order of options matters, which is contrary to GNU
794 conventions (because it is confusing and inconvenient). */
797 symbol_file_command (args, from_tty)
803 CORE_ADDR text_relocation = 0; /* text_relocation */
804 struct cleanup *cleanups;
812 if ((have_full_symbols () || have_partial_symbols ())
814 && !query ("Discard symbol table from `%s'? ",
815 symfile_objfile -> name))
816 error ("Not confirmed.");
817 free_all_objfiles ();
819 /* solib descriptors may have handles to objfiles. Since their
820 storage has just been released, we'd better wipe the solib
823 #if defined(SOLIB_RESTART)
827 symfile_objfile = NULL;
830 printf_unfiltered ("No symbol file now.\n");
833 RESET_HP_UX_GLOBALS ();
838 if ((argv = buildargv (args)) == NULL)
842 cleanups = make_cleanup ((make_cleanup_func) freeargv, (char *) argv);
843 while (*argv != NULL)
845 if (STREQ (*argv, "-mapped"))
849 else if (STREQ (*argv, "-readnow"))
853 else if (**argv == '-')
855 error ("unknown option `%s'", *argv);
863 /* this is for rombug remote only, to get the text relocation by
864 using link command */
865 p = strrchr(name, '/');
869 target_link(p, &text_relocation);
871 if (text_relocation == (CORE_ADDR)0)
873 else if (text_relocation == (CORE_ADDR)-1)
875 symbol_file_add (name, from_tty, (CORE_ADDR)0,
876 1, mapped, readnow, 1, 0);
878 RESET_HP_UX_GLOBALS ();
882 symbol_file_add (name, from_tty, (CORE_ADDR)text_relocation,
883 0, mapped, readnow, 1, 0);
885 /* Getting new symbols may change our opinion about what is
887 reinit_frame_cache ();
889 set_initial_language ();
896 error ("no symbol file name was specified");
898 TUIDO(((TuiOpaqueFuncPtr)tuiDisplayMainFunction));
899 do_cleanups (cleanups);
903 /* Set the initial language.
905 A better solution would be to record the language in the psymtab when reading
906 partial symbols, and then use it (if known) to set the language. This would
907 be a win for formats that encode the language in an easily discoverable place,
908 such as DWARF. For stabs, we can jump through hoops looking for specially
909 named symbols or try to intuit the language from the specific type of stabs
910 we find, but we can't do that until later when we read in full symbols.
914 set_initial_language ()
916 struct partial_symtab *pst;
917 enum language lang = language_unknown;
919 pst = find_main_psymtab ();
922 if (pst -> filename != NULL)
924 lang = deduce_language_from_filename (pst -> filename);
926 if (lang == language_unknown)
928 /* Make C the default language */
932 expected_language = current_language; /* Don't warn the user */
936 /* Open file specified by NAME and hand it off to BFD for preliminary
937 analysis. Result is a newly initialized bfd *, which includes a newly
938 malloc'd` copy of NAME (tilde-expanded and made absolute).
939 In case of trouble, error() is called. */
942 symfile_bfd_open (name)
951 name = tilde_expand (name); /* Returns 1st new malloc'd copy */
953 /* Look down path for it, allocate 2nd new malloc'd copy. */
954 desc = openp (getenv ("PATH"), 1, name, O_RDONLY | O_BINARY, 0, &absolute_name);
955 #if defined(__GO32__) || defined(_WIN32)
958 char *exename = alloca (strlen (name) + 5);
959 strcat (strcpy (exename, name), ".exe");
960 desc = openp (getenv ("PATH"), 1, exename, O_RDONLY | O_BINARY,
966 make_cleanup (free, name);
967 perror_with_name (name);
969 fcntl (desc, F_SETFD, 1);
970 free (name); /* Free 1st new malloc'd copy */
971 name = absolute_name; /* Keep 2nd malloc'd copy in bfd */
972 /* It'll be freed in free_objfile(). */
974 sym_bfd = bfd_fdopenr (name, gnutarget, desc);
978 make_cleanup (free, name);
979 error ("\"%s\": can't open to read symbols: %s.", name,
980 bfd_errmsg (bfd_get_error ()));
982 sym_bfd->cacheable = true;
984 if (!bfd_check_format (sym_bfd, bfd_object))
986 /* FIXME: should be checking for errors from bfd_close (for one thing,
987 on error it does not free all the storage associated with the
989 bfd_close (sym_bfd); /* This also closes desc */
990 make_cleanup (free, name);
991 error ("\"%s\": can't read symbols: %s.", name,
992 bfd_errmsg (bfd_get_error ()));
997 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
998 startup by the _initialize routine in each object file format reader,
999 to register information about each format the the reader is prepared
1006 sf->next = symtab_fns;
1011 /* Initialize to read symbols from the symbol file sym_bfd. It either
1012 returns or calls error(). The result is an initialized struct sym_fns
1013 in the objfile structure, that contains cached information about the
1017 find_sym_fns (objfile)
1018 struct objfile *objfile;
1021 enum bfd_flavour our_flavour = bfd_get_flavour (objfile -> obfd);
1022 char *our_target = bfd_get_target (objfile -> obfd);
1024 /* Special kludge for RS/6000 and PowerMac. See xcoffread.c. */
1025 if (STREQ (our_target, "aixcoff-rs6000") ||
1026 STREQ (our_target, "xcoff-powermac"))
1027 our_flavour = (enum bfd_flavour)-1;
1029 /* Special kludge for apollo. See dstread.c. */
1030 if (STREQN (our_target, "apollo", 6))
1031 our_flavour = (enum bfd_flavour)-2;
1033 for (sf = symtab_fns; sf != NULL; sf = sf -> next)
1035 if (our_flavour == sf -> sym_flavour)
1041 error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
1042 bfd_get_target (objfile -> obfd));
1045 /* This function runs the load command of our current target. */
1048 load_command (arg, from_tty)
1053 arg = get_exec_file (1);
1054 target_load (arg, from_tty);
1057 /* This version of "load" should be usable for any target. Currently
1058 it is just used for remote targets, not inftarg.c or core files,
1059 on the theory that only in that case is it useful.
1061 Avoiding xmodem and the like seems like a win (a) because we don't have
1062 to worry about finding it, and (b) On VMS, fork() is very slow and so
1063 we don't want to run a subprocess. On the other hand, I'm not sure how
1064 performance compares. */
1065 #define GENERIC_LOAD_CHUNK 256
1066 #define VALIDATE_DOWNLOAD 0
1068 generic_load (filename, from_tty)
1072 struct cleanup *old_cleanups;
1075 time_t start_time, end_time; /* Start and end times of download */
1076 unsigned long data_count = 0; /* Number of bytes transferred to memory */
1078 unsigned long load_offset = 0; /* offset to add to vma for each section */
1079 char buf[GENERIC_LOAD_CHUNK+8];
1080 #if VALIDATE_DOWNLOAD
1081 char verify_buffer[GENERIC_LOAD_CHUNK+8] ;
1084 /* enable user to specify address for downloading as 2nd arg to load */
1085 n = sscanf(filename, "%s 0x%lx", buf, &load_offset);
1091 loadfile_bfd = bfd_openr (filename, gnutarget);
1092 if (loadfile_bfd == NULL)
1094 perror_with_name (filename);
1097 /* FIXME: should be checking for errors from bfd_close (for one thing,
1098 on error it does not free all the storage associated with the
1100 old_cleanups = make_cleanup ((make_cleanup_func) bfd_close, loadfile_bfd);
1102 if (!bfd_check_format (loadfile_bfd, bfd_object))
1104 error ("\"%s\" is not an object file: %s", filename,
1105 bfd_errmsg (bfd_get_error ()));
1108 start_time = time (NULL);
1110 for (s = loadfile_bfd->sections; s; s = s->next)
1112 if (s->flags & SEC_LOAD)
1116 size = bfd_get_section_size_before_reloc (s);
1120 struct cleanup *old_chain;
1122 unsigned long l = size ;
1128 l = l > GENERIC_LOAD_CHUNK ? GENERIC_LOAD_CHUNK : l ;
1130 buffer = xmalloc (size);
1131 old_chain = make_cleanup (free, buffer);
1136 /* Is this really necessary? I guess it gives the user something
1137 to look at during a long download. */
1138 printf_filtered ("Loading section %s, size 0x%lx lma ",
1139 bfd_get_section_name (loadfile_bfd, s),
1140 (unsigned long) size);
1141 print_address_numeric (lma, 1, gdb_stdout);
1142 printf_filtered ("\n");
1144 bfd_get_section_contents (loadfile_bfd, s, buffer, 0, size);
1146 sect = (char *) bfd_get_section_name (loadfile_bfd, s);
1150 len = (size - sent) < l ? (size - sent) : l;
1152 err = target_write_memory (lma, buffer, len);
1153 if (ui_load_progress_hook)
1154 if (ui_load_progress_hook (sect, sent))
1155 error ("Canceled the download");
1156 #if VALIDATE_DOWNLOAD
1157 /* Broken memories and broken monitors manifest themselves
1158 here when bring new computers to life.
1159 This doubles already slow downloads.
1163 target_read_memory(lma,verify_buffer,len) ;
1164 if (0 != bcmp(buffer,verify_buffer,len))
1165 error("Download verify failed at %08x",
1166 (unsigned long)lma) ;
1174 while (err == 0 && sent < size);
1177 error ("Memory access error while loading section %s.",
1178 bfd_get_section_name (loadfile_bfd, s));
1180 do_cleanups (old_chain);
1185 end_time = time (NULL);
1187 unsigned long entry ;
1188 entry = bfd_get_start_address(loadfile_bfd) ;
1189 printf_filtered ("Start address 0x%lx , load size %d\n", entry,data_count);
1190 /* We were doing this in remote-mips.c, I suspect it is right
1191 for other targets too. */
1195 /* FIXME: are we supposed to call symbol_file_add or not? According to
1196 a comment from remote-mips.c (where a call to symbol_file_add was
1197 commented out), making the call confuses GDB if more than one file is
1198 loaded in. remote-nindy.c had no call to symbol_file_add, but remote-vx.c
1201 report_transfer_performance (data_count, start_time, end_time);
1203 do_cleanups (old_cleanups);
1206 /* Report how fast the transfer went. */
1209 report_transfer_performance (data_count, start_time, end_time)
1210 unsigned long data_count;
1211 time_t start_time, end_time;
1213 printf_filtered ("Transfer rate: ");
1214 if (end_time != start_time)
1215 printf_filtered ("%d bits/sec",
1216 (data_count * 8) / (end_time - start_time));
1218 printf_filtered ("%d bits in <1 sec", (data_count * 8));
1219 printf_filtered (".\n");
1222 /* This function allows the addition of incrementally linked object files.
1223 It does not modify any state in the target, only in the debugger. */
1227 add_symbol_file_command (args, from_tty)
1232 CORE_ADDR text_addr;
1241 error ("add-symbol-file takes a file name and an address");
1244 /* Make a copy of the string that we can safely write into. */
1246 args = strdup (args);
1247 make_cleanup (free, args);
1249 /* Pick off any -option args and the file name. */
1251 while ((*args != '\000') && (name == NULL))
1253 while (isspace (*args)) {args++;}
1255 while ((*args != '\000') && !isspace (*args)) {args++;}
1256 if (*args != '\000')
1264 else if (STREQ (arg, "-mapped"))
1268 else if (STREQ (arg, "-readnow"))
1274 error ("unknown option `%s'", arg);
1278 /* After picking off any options and the file name, args should be
1279 left pointing at the remainder of the command line, which should
1280 be the address expression to evaluate. */
1284 error ("add-symbol-file takes a file name");
1286 name = tilde_expand (name);
1287 make_cleanup (free, name);
1289 if (*args != '\000')
1291 text_addr = parse_and_eval_address (args);
1295 target_link(name, &text_addr);
1296 if (text_addr == (CORE_ADDR)-1)
1297 error("Don't know how to get text start location for this file");
1300 /* FIXME-32x64: Assumes text_addr fits in a long. */
1302 && (!query ("add symbol table from file \"%s\" at text_addr = %s?\n",
1303 name, local_hex_string ((unsigned long)text_addr))))
1304 error ("Not confirmed.");
1306 symbol_file_add (name, from_tty, text_addr, 0, mapped, readnow,
1307 1, /* user_loaded */
1308 0); /* We'll guess it's ! is_solib */
1310 /* Getting new symbols may change our opinion about what is
1312 reinit_frame_cache ();
1316 add_shared_symbol_files_command (args, from_tty)
1320 #ifdef ADD_SHARED_SYMBOL_FILES
1321 ADD_SHARED_SYMBOL_FILES (args, from_tty);
1323 error ("This command is not available in this configuration of GDB.");
1327 /* Re-read symbols if a symbol-file has changed. */
1331 struct objfile *objfile;
1334 struct stat new_statbuf;
1337 /* With the addition of shared libraries, this should be modified,
1338 the load time should be saved in the partial symbol tables, since
1339 different tables may come from different source files. FIXME.
1340 This routine should then walk down each partial symbol table
1341 and see if the symbol table that it originates from has been changed */
1343 for (objfile = object_files; objfile; objfile = objfile->next) {
1344 if (objfile->obfd) {
1345 #ifdef IBM6000_TARGET
1346 /* If this object is from a shared library, then you should
1347 stat on the library name, not member name. */
1349 if (objfile->obfd->my_archive)
1350 res = stat (objfile->obfd->my_archive->filename, &new_statbuf);
1353 res = stat (objfile->name, &new_statbuf);
1355 /* FIXME, should use print_sys_errmsg but it's not filtered. */
1356 printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
1360 new_modtime = new_statbuf.st_mtime;
1361 if (new_modtime != objfile->mtime)
1363 struct cleanup *old_cleanups;
1364 struct section_offsets *offsets;
1366 int section_offsets_size;
1367 char *obfd_filename;
1369 printf_filtered ("`%s' has changed; re-reading symbols.\n",
1372 /* There are various functions like symbol_file_add,
1373 symfile_bfd_open, syms_from_objfile, etc., which might
1374 appear to do what we want. But they have various other
1375 effects which we *don't* want. So we just do stuff
1376 ourselves. We don't worry about mapped files (for one thing,
1377 any mapped file will be out of date). */
1379 /* If we get an error, blow away this objfile (not sure if
1380 that is the correct response for things like shared
1382 old_cleanups = make_cleanup ((make_cleanup_func) free_objfile,
1384 /* We need to do this whenever any symbols go away. */
1385 make_cleanup ((make_cleanup_func) clear_symtab_users, 0);
1387 /* Clean up any state BFD has sitting around. We don't need
1388 to close the descriptor but BFD lacks a way of closing the
1389 BFD without closing the descriptor. */
1390 obfd_filename = bfd_get_filename (objfile->obfd);
1391 if (!bfd_close (objfile->obfd))
1392 error ("Can't close BFD for %s: %s", objfile->name,
1393 bfd_errmsg (bfd_get_error ()));
1394 objfile->obfd = bfd_openr (obfd_filename, gnutarget);
1395 if (objfile->obfd == NULL)
1396 error ("Can't open %s to read symbols.", objfile->name);
1397 /* bfd_openr sets cacheable to true, which is what we want. */
1398 if (!bfd_check_format (objfile->obfd, bfd_object))
1399 error ("Can't read symbols from %s: %s.", objfile->name,
1400 bfd_errmsg (bfd_get_error ()));
1402 /* Save the offsets, we will nuke them with the rest of the
1404 num_offsets = objfile->num_sections;
1405 section_offsets_size =
1406 sizeof (struct section_offsets)
1407 + sizeof (objfile->section_offsets->offsets) * num_offsets;
1408 offsets = (struct section_offsets *) alloca (section_offsets_size);
1409 memcpy (offsets, objfile->section_offsets, section_offsets_size);
1411 /* Nuke all the state that we will re-read. Much of the following
1412 code which sets things to NULL really is necessary to tell
1413 other parts of GDB that there is nothing currently there. */
1415 /* FIXME: Do we have to free a whole linked list, or is this
1417 if (objfile->global_psymbols.list)
1418 mfree (objfile->md, objfile->global_psymbols.list);
1419 memset (&objfile -> global_psymbols, 0,
1420 sizeof (objfile -> global_psymbols));
1421 if (objfile->static_psymbols.list)
1422 mfree (objfile->md, objfile->static_psymbols.list);
1423 memset (&objfile -> static_psymbols, 0,
1424 sizeof (objfile -> static_psymbols));
1426 /* Free the obstacks for non-reusable objfiles */
1427 obstack_free (&objfile -> psymbol_cache.cache, 0);
1428 memset (&objfile -> psymbol_cache, 0,
1429 sizeof (objfile -> psymbol_cache));
1430 obstack_free (&objfile -> psymbol_obstack, 0);
1431 obstack_free (&objfile -> symbol_obstack, 0);
1432 obstack_free (&objfile -> type_obstack, 0);
1433 objfile->sections = NULL;
1434 objfile->symtabs = NULL;
1435 objfile->psymtabs = NULL;
1436 objfile->free_psymtabs = NULL;
1437 objfile->msymbols = NULL;
1438 objfile->minimal_symbol_count= 0;
1439 objfile->fundamental_types = NULL;
1440 if (objfile -> sf != NULL)
1442 (*objfile -> sf -> sym_finish) (objfile);
1445 /* We never make this a mapped file. */
1446 objfile -> md = NULL;
1447 /* obstack_specify_allocation also initializes the obstack so
1449 obstack_specify_allocation (&objfile -> psymbol_cache.cache, 0, 0,
1451 obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0,
1453 obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0,
1455 obstack_specify_allocation (&objfile -> type_obstack, 0, 0,
1457 if (build_objfile_section_table (objfile))
1459 error ("Can't find the file sections in `%s': %s",
1460 objfile -> name, bfd_errmsg (bfd_get_error ()));
1463 /* We use the same section offsets as from last time. I'm not
1464 sure whether that is always correct for shared libraries. */
1465 objfile->section_offsets = (struct section_offsets *)
1466 obstack_alloc (&objfile -> psymbol_obstack, section_offsets_size);
1467 memcpy (objfile->section_offsets, offsets, section_offsets_size);
1468 objfile->num_sections = num_offsets;
1470 /* What the hell is sym_new_init for, anyway? The concept of
1471 distinguishing between the main file and additional files
1472 in this way seems rather dubious. */
1473 if (objfile == symfile_objfile)
1475 (*objfile->sf->sym_new_init) (objfile);
1477 RESET_HP_UX_GLOBALS ();
1481 (*objfile->sf->sym_init) (objfile);
1482 clear_complaints (1, 1);
1483 /* The "mainline" parameter is a hideous hack; I think leaving it
1484 zero is OK since dbxread.c also does what it needs to do if
1485 objfile->global_psymbols.size is 0. */
1486 (*objfile->sf->sym_read) (objfile, objfile->section_offsets, 0);
1487 if (!have_partial_symbols () && !have_full_symbols ())
1490 printf_filtered ("(no debugging symbols found)\n");
1493 objfile -> flags |= OBJF_SYMS;
1495 /* We're done reading the symbol file; finish off complaints. */
1496 clear_complaints (0, 1);
1498 /* Getting new symbols may change our opinion about what is
1501 reinit_frame_cache ();
1503 /* Discard cleanups as symbol reading was successful. */
1504 discard_cleanups (old_cleanups);
1506 /* If the mtime has changed between the time we set new_modtime
1507 and now, we *want* this to be out of date, so don't call stat
1509 objfile->mtime = new_modtime;
1512 /* Call this after reading in a new symbol table to give target
1513 dependant code a crack at the new symbols. For instance, this
1514 could be used to update the values of target-specific symbols GDB
1515 needs to keep track of (such as _sigtramp, or whatever). */
1517 TARGET_SYMFILE_POSTREAD (objfile);
1523 clear_symtab_users ();
1531 } filename_language;
1533 static filename_language * filename_language_table;
1534 static int fl_table_size, fl_table_next;
1537 add_filename_language (ext, lang)
1541 if (fl_table_next >= fl_table_size)
1543 fl_table_size += 10;
1544 filename_language_table = realloc (filename_language_table,
1548 filename_language_table[fl_table_next].ext = strsave (ext);
1549 filename_language_table[fl_table_next].lang = lang;
1553 static char *ext_args;
1556 set_ext_lang_command (args, from_tty)
1561 char *cp = ext_args;
1564 /* First arg is filename extension, starting with '.' */
1566 error ("'%s': Filename extension must begin with '.'", ext_args);
1568 /* Find end of first arg. */
1569 while (*cp && !isspace (*cp))
1573 error ("'%s': two arguments required -- filename extension and language",
1576 /* Null-terminate first arg */
1579 /* Find beginning of second arg, which should be a source language. */
1580 while (*cp && isspace (*cp))
1584 error ("'%s': two arguments required -- filename extension and language",
1587 /* Lookup the language from among those we know. */
1588 lang = language_enum (cp);
1590 /* Now lookup the filename extension: do we already know it? */
1591 for (i = 0; i < fl_table_next; i++)
1592 if (0 == strcmp (ext_args, filename_language_table[i].ext))
1595 if (i >= fl_table_next)
1597 /* new file extension */
1598 add_filename_language (ext_args, lang);
1602 /* redefining a previously known filename extension */
1605 /* query ("Really make files of type %s '%s'?", */
1606 /* ext_args, language_str (lang)); */
1608 free (filename_language_table[i].ext);
1609 filename_language_table[i].ext = strsave (ext_args);
1610 filename_language_table[i].lang = lang;
1615 info_ext_lang_command (args, from_tty)
1621 printf_filtered ("Filename extensions and the languages they represent:");
1622 printf_filtered ("\n\n");
1623 for (i = 0; i < fl_table_next; i++)
1624 printf_filtered ("\t%s\t- %s\n",
1625 filename_language_table[i].ext,
1626 language_str (filename_language_table[i].lang));
1630 init_filename_language_table ()
1632 if (fl_table_size == 0) /* protect against repetition */
1636 filename_language_table =
1637 xmalloc (fl_table_size * sizeof (*filename_language_table));
1638 add_filename_language (".c", language_c);
1639 add_filename_language (".C", language_cplus);
1640 add_filename_language (".cc", language_cplus);
1641 add_filename_language (".cp", language_cplus);
1642 add_filename_language (".cpp", language_cplus);
1643 add_filename_language (".cxx", language_cplus);
1644 add_filename_language (".c++", language_cplus);
1645 add_filename_language (".java", language_java);
1646 add_filename_language (".class", language_java);
1647 add_filename_language (".ch", language_chill);
1648 add_filename_language (".c186", language_chill);
1649 add_filename_language (".c286", language_chill);
1650 add_filename_language (".f", language_fortran);
1651 add_filename_language (".F", language_fortran);
1652 add_filename_language (".s", language_asm);
1653 add_filename_language (".S", language_asm);
1658 deduce_language_from_filename (filename)
1664 if (filename != NULL)
1665 if ((cp = strrchr (filename, '.')) != NULL)
1666 for (i = 0; i < fl_table_next; i++)
1667 if (strcmp (cp, filename_language_table[i].ext) == 0)
1668 return filename_language_table[i].lang;
1670 return language_unknown;
1675 Allocate and partly initialize a new symbol table. Return a pointer
1676 to it. error() if no space.
1678 Caller must set these fields:
1684 possibly free_named_symtabs (symtab->filename);
1688 allocate_symtab (filename, objfile)
1690 struct objfile *objfile;
1692 register struct symtab *symtab;
1694 symtab = (struct symtab *)
1695 obstack_alloc (&objfile -> symbol_obstack, sizeof (struct symtab));
1696 memset (symtab, 0, sizeof (*symtab));
1697 symtab -> filename = obsavestring (filename, strlen (filename),
1698 &objfile -> symbol_obstack);
1699 symtab -> fullname = NULL;
1700 symtab -> language = deduce_language_from_filename (filename);
1701 symtab -> debugformat = obsavestring ("unknown", 7,
1702 &objfile -> symbol_obstack);
1704 /* Hook it to the objfile it comes from */
1706 symtab -> objfile = objfile;
1707 symtab -> next = objfile -> symtabs;
1708 objfile -> symtabs = symtab;
1710 /* FIXME: This should go away. It is only defined for the Z8000,
1711 and the Z8000 definition of this macro doesn't have anything to
1712 do with the now-nonexistent EXTRA_SYMTAB_INFO macro, it's just
1713 here for convenience. */
1714 #ifdef INIT_EXTRA_SYMTAB_INFO
1715 INIT_EXTRA_SYMTAB_INFO (symtab);
1721 struct partial_symtab *
1722 allocate_psymtab (filename, objfile)
1724 struct objfile *objfile;
1726 struct partial_symtab *psymtab;
1728 if (objfile -> free_psymtabs)
1730 psymtab = objfile -> free_psymtabs;
1731 objfile -> free_psymtabs = psymtab -> next;
1734 psymtab = (struct partial_symtab *)
1735 obstack_alloc (&objfile -> psymbol_obstack,
1736 sizeof (struct partial_symtab));
1738 memset (psymtab, 0, sizeof (struct partial_symtab));
1739 psymtab -> filename = obsavestring (filename, strlen (filename),
1740 &objfile -> psymbol_obstack);
1741 psymtab -> symtab = NULL;
1743 /* Prepend it to the psymtab list for the objfile it belongs to.
1744 Psymtabs are searched in most recent inserted -> least recent
1747 psymtab -> objfile = objfile;
1748 psymtab -> next = objfile -> psymtabs;
1749 objfile -> psymtabs = psymtab;
1752 struct partial_symtab **prev_pst;
1753 psymtab -> objfile = objfile;
1754 psymtab -> next = NULL;
1755 prev_pst = &(objfile -> psymtabs);
1756 while ((*prev_pst) != NULL)
1757 prev_pst = &((*prev_pst) -> next);
1758 (*prev_pst) = psymtab;
1766 discard_psymtab (pst)
1767 struct partial_symtab *pst;
1769 struct partial_symtab **prev_pst;
1772 Empty psymtabs happen as a result of header files which don't
1773 have any symbols in them. There can be a lot of them. But this
1774 check is wrong, in that a psymtab with N_SLINE entries but
1775 nothing else is not empty, but we don't realize that. Fixing
1776 that without slowing things down might be tricky. */
1778 /* First, snip it out of the psymtab chain */
1780 prev_pst = &(pst->objfile->psymtabs);
1781 while ((*prev_pst) != pst)
1782 prev_pst = &((*prev_pst)->next);
1783 (*prev_pst) = pst->next;
1785 /* Next, put it on a free list for recycling */
1787 pst->next = pst->objfile->free_psymtabs;
1788 pst->objfile->free_psymtabs = pst;
1792 /* Reset all data structures in gdb which may contain references to symbol
1796 clear_symtab_users ()
1798 /* Someday, we should do better than this, by only blowing away
1799 the things that really need to be blown. */
1800 clear_value_history ();
1802 clear_internalvars ();
1803 breakpoint_re_set ();
1804 set_default_breakpoint (0, 0, 0, 0);
1805 current_source_symtab = 0;
1806 current_source_line = 0;
1807 clear_pc_function_cache ();
1808 target_new_objfile (NULL);
1811 /* clear_symtab_users_once:
1813 This function is run after symbol reading, or from a cleanup.
1814 If an old symbol table was obsoleted, the old symbol table
1815 has been blown away, but the other GDB data structures that may
1816 reference it have not yet been cleared or re-directed. (The old
1817 symtab was zapped, and the cleanup queued, in free_named_symtab()
1820 This function can be queued N times as a cleanup, or called
1821 directly; it will do all the work the first time, and then will be a
1822 no-op until the next time it is queued. This works by bumping a
1823 counter at queueing time. Much later when the cleanup is run, or at
1824 the end of symbol processing (in case the cleanup is discarded), if
1825 the queued count is greater than the "done-count", we do the work
1826 and set the done-count to the queued count. If the queued count is
1827 less than or equal to the done-count, we just ignore the call. This
1828 is needed because reading a single .o file will often replace many
1829 symtabs (one per .h file, for example), and we don't want to reset
1830 the breakpoints N times in the user's face.
1832 The reason we both queue a cleanup, and call it directly after symbol
1833 reading, is because the cleanup protects us in case of errors, but is
1834 discarded if symbol reading is successful. */
1837 /* FIXME: As free_named_symtabs is currently a big noop this function
1838 is no longer needed. */
1840 clear_symtab_users_once PARAMS ((void));
1842 static int clear_symtab_users_queued;
1843 static int clear_symtab_users_done;
1846 clear_symtab_users_once ()
1848 /* Enforce once-per-`do_cleanups'-semantics */
1849 if (clear_symtab_users_queued <= clear_symtab_users_done)
1851 clear_symtab_users_done = clear_symtab_users_queued;
1853 clear_symtab_users ();
1857 /* Delete the specified psymtab, and any others that reference it. */
1860 cashier_psymtab (pst)
1861 struct partial_symtab *pst;
1863 struct partial_symtab *ps, *pprev = NULL;
1866 /* Find its previous psymtab in the chain */
1867 for (ps = pst->objfile->psymtabs; ps; ps = ps->next) {
1874 /* Unhook it from the chain. */
1875 if (ps == pst->objfile->psymtabs)
1876 pst->objfile->psymtabs = ps->next;
1878 pprev->next = ps->next;
1880 /* FIXME, we can't conveniently deallocate the entries in the
1881 partial_symbol lists (global_psymbols/static_psymbols) that
1882 this psymtab points to. These just take up space until all
1883 the psymtabs are reclaimed. Ditto the dependencies list and
1884 filename, which are all in the psymbol_obstack. */
1886 /* We need to cashier any psymtab that has this one as a dependency... */
1888 for (ps = pst->objfile->psymtabs; ps; ps = ps->next) {
1889 for (i = 0; i < ps->number_of_dependencies; i++) {
1890 if (ps->dependencies[i] == pst) {
1891 cashier_psymtab (ps);
1892 goto again; /* Must restart, chain has been munged. */
1899 /* If a symtab or psymtab for filename NAME is found, free it along
1900 with any dependent breakpoints, displays, etc.
1901 Used when loading new versions of object modules with the "add-file"
1902 command. This is only called on the top-level symtab or psymtab's name;
1903 it is not called for subsidiary files such as .h files.
1905 Return value is 1 if we blew away the environment, 0 if not.
1906 FIXME. The return valu appears to never be used.
1908 FIXME. I think this is not the best way to do this. We should
1909 work on being gentler to the environment while still cleaning up
1910 all stray pointers into the freed symtab. */
1913 free_named_symtabs (name)
1917 /* FIXME: With the new method of each objfile having it's own
1918 psymtab list, this function needs serious rethinking. In particular,
1919 why was it ever necessary to toss psymtabs with specific compilation
1920 unit filenames, as opposed to all psymtabs from a particular symbol
1922 Well, the answer is that some systems permit reloading of particular
1923 compilation units. We want to blow away any old info about these
1924 compilation units, regardless of which objfiles they arrived in. --gnu. */
1926 register struct symtab *s;
1927 register struct symtab *prev;
1928 register struct partial_symtab *ps;
1929 struct blockvector *bv;
1932 /* We only wack things if the symbol-reload switch is set. */
1933 if (!symbol_reloading)
1936 /* Some symbol formats have trouble providing file names... */
1937 if (name == 0 || *name == '\0')
1940 /* Look for a psymtab with the specified name. */
1943 for (ps = partial_symtab_list; ps; ps = ps->next) {
1944 if (STREQ (name, ps->filename)) {
1945 cashier_psymtab (ps); /* Blow it away...and its little dog, too. */
1946 goto again2; /* Must restart, chain has been munged */
1950 /* Look for a symtab with the specified name. */
1952 for (s = symtab_list; s; s = s->next)
1954 if (STREQ (name, s->filename))
1961 if (s == symtab_list)
1962 symtab_list = s->next;
1964 prev->next = s->next;
1966 /* For now, queue a delete for all breakpoints, displays, etc., whether
1967 or not they depend on the symtab being freed. This should be
1968 changed so that only those data structures affected are deleted. */
1970 /* But don't delete anything if the symtab is empty.
1971 This test is necessary due to a bug in "dbxread.c" that
1972 causes empty symtabs to be created for N_SO symbols that
1973 contain the pathname of the object file. (This problem
1974 has been fixed in GDB 3.9x). */
1976 bv = BLOCKVECTOR (s);
1977 if (BLOCKVECTOR_NBLOCKS (bv) > 2
1978 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK))
1979 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK)))
1981 complain (&oldsyms_complaint, name);
1983 clear_symtab_users_queued++;
1984 make_cleanup (clear_symtab_users_once, 0);
1987 complain (&empty_symtab_complaint, name);
1994 /* It is still possible that some breakpoints will be affected
1995 even though no symtab was found, since the file might have
1996 been compiled without debugging, and hence not be associated
1997 with a symtab. In order to handle this correctly, we would need
1998 to keep a list of text address ranges for undebuggable files.
1999 For now, we do nothing, since this is a fairly obscure case. */
2003 /* FIXME, what about the minimal symbol table? */
2010 /* Allocate and partially fill a partial symtab. It will be
2011 completely filled at the end of the symbol list.
2013 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
2014 is the address relative to which its symbols are (incremental) or 0
2018 struct partial_symtab *
2019 start_psymtab_common (objfile, section_offsets,
2020 filename, textlow, global_syms, static_syms)
2021 struct objfile *objfile;
2022 struct section_offsets *section_offsets;
2025 struct partial_symbol **global_syms;
2026 struct partial_symbol **static_syms;
2028 struct partial_symtab *psymtab;
2030 psymtab = allocate_psymtab (filename, objfile);
2031 psymtab -> section_offsets = section_offsets;
2032 psymtab -> textlow = textlow;
2033 psymtab -> texthigh = psymtab -> textlow; /* default */
2034 psymtab -> globals_offset = global_syms - objfile -> global_psymbols.list;
2035 psymtab -> statics_offset = static_syms - objfile -> static_psymbols.list;
2039 /* Add a symbol with a long value to a psymtab.
2040 Since one arg is a struct, we pass in a ptr and deref it (sigh). */
2043 add_psymbol_to_list (name, namelength, namespace, class, list, val, coreaddr,
2047 namespace_enum namespace;
2048 enum address_class class;
2049 struct psymbol_allocation_list *list;
2050 long val; /* Value as a long */
2051 CORE_ADDR coreaddr; /* Value as a CORE_ADDR */
2052 enum language language;
2053 struct objfile *objfile;
2055 register struct partial_symbol *psym;
2056 char *buf = alloca (namelength + 1);
2057 /* psymbol is static so that there will be no uninitialized gaps in the
2058 structure which might contain random data, causing cache misses in
2060 static struct partial_symbol psymbol;
2062 /* Create local copy of the partial symbol */
2063 memcpy (buf, name, namelength);
2064 buf[namelength] = '\0';
2065 SYMBOL_NAME (&psymbol) = bcache (buf, namelength + 1, &objfile->psymbol_cache);
2066 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2069 SYMBOL_VALUE (&psymbol) = val;
2073 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2075 SYMBOL_SECTION (&psymbol) = 0;
2076 SYMBOL_LANGUAGE (&psymbol) = language;
2077 PSYMBOL_NAMESPACE (&psymbol) = namespace;
2078 PSYMBOL_CLASS (&psymbol) = class;
2079 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2081 /* Stash the partial symbol away in the cache */
2082 psym = bcache (&psymbol, sizeof (struct partial_symbol), &objfile->psymbol_cache);
2084 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2085 if (list->next >= list->list + list->size)
2087 extend_psymbol_list (list, objfile);
2089 *list->next++ = psym;
2090 OBJSTAT (objfile, n_psyms++);
2093 /* Add a symbol with a long value to a psymtab. This differs from
2094 * add_psymbol_to_list above in taking both a mangled and a demangled
2098 add_psymbol_with_dem_name_to_list (name, namelength, dem_name, dem_namelength,
2099 namespace, class, list, val, coreaddr, language, objfile)
2104 namespace_enum namespace;
2105 enum address_class class;
2106 struct psymbol_allocation_list *list;
2107 long val; /* Value as a long */
2108 CORE_ADDR coreaddr; /* Value as a CORE_ADDR */
2109 enum language language;
2110 struct objfile *objfile;
2112 register struct partial_symbol *psym;
2113 char *buf = alloca (namelength + 1);
2114 /* psymbol is static so that there will be no uninitialized gaps in the
2115 structure which might contain random data, causing cache misses in
2117 static struct partial_symbol psymbol;
2119 /* Create local copy of the partial symbol */
2121 memcpy (buf, name, namelength);
2122 buf[namelength] = '\0';
2123 SYMBOL_NAME (&psymbol) = bcache (buf, namelength + 1, &objfile->psymbol_cache);
2125 buf = alloca (dem_namelength + 1);
2126 memcpy (buf, dem_name, dem_namelength);
2127 buf[dem_namelength] = '\0';
2132 case language_cplus:
2133 SYMBOL_CPLUS_DEMANGLED_NAME (&psymbol) =
2134 bcache (buf, dem_namelength + 1, &objfile->psymbol_cache);
2136 case language_chill:
2137 SYMBOL_CHILL_DEMANGLED_NAME (&psymbol) =
2138 bcache (buf, dem_namelength + 1, &objfile->psymbol_cache);
2140 /* FIXME What should be done for the default case? Ignoring for now. */
2143 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2146 SYMBOL_VALUE (&psymbol) = val;
2150 SYMBOL_VALUE_ADDRESS (&psymbol) = coreaddr;
2152 SYMBOL_SECTION (&psymbol) = 0;
2153 SYMBOL_LANGUAGE (&psymbol) = language;
2154 PSYMBOL_NAMESPACE (&psymbol) = namespace;
2155 PSYMBOL_CLASS (&psymbol) = class;
2156 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol, language);
2158 /* Stash the partial symbol away in the cache */
2159 psym = bcache (&psymbol, sizeof (struct partial_symbol), &objfile->psymbol_cache);
2161 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2162 if (list->next >= list->list + list->size)
2164 extend_psymbol_list (list, objfile);
2166 *list->next++ = psym;
2167 OBJSTAT (objfile, n_psyms++);
2170 /* Initialize storage for partial symbols. */
2173 init_psymbol_list (objfile, total_symbols)
2174 struct objfile *objfile;
2177 /* Free any previously allocated psymbol lists. */
2179 if (objfile -> global_psymbols.list)
2181 mfree (objfile -> md, (PTR)objfile -> global_psymbols.list);
2183 if (objfile -> static_psymbols.list)
2185 mfree (objfile -> md, (PTR)objfile -> static_psymbols.list);
2188 /* Current best guess is that approximately a twentieth
2189 of the total symbols (in a debugging file) are global or static
2192 objfile -> global_psymbols.size = total_symbols / 10;
2193 objfile -> static_psymbols.size = total_symbols / 10;
2195 if (objfile -> global_psymbols.size > 0)
2197 objfile -> global_psymbols.next =
2198 objfile -> global_psymbols.list = (struct partial_symbol **)
2199 xmmalloc (objfile -> md, (objfile -> global_psymbols.size
2200 * sizeof (struct partial_symbol *)));
2202 if (objfile -> static_psymbols.size > 0)
2204 objfile -> static_psymbols.next =
2205 objfile -> static_psymbols.list = (struct partial_symbol **)
2206 xmmalloc (objfile -> md, (objfile -> static_psymbols.size
2207 * sizeof (struct partial_symbol *)));
2212 The following code implements an abstraction for debugging overlay sections.
2214 The target model is as follows:
2215 1) The gnu linker will permit multiple sections to be mapped into the
2216 same VMA, each with its own unique LMA (or load address).
2217 2) It is assumed that some runtime mechanism exists for mapping the
2218 sections, one by one, from the load address into the VMA address.
2219 3) This code provides a mechanism for gdb to keep track of which
2220 sections should be considered to be mapped from the VMA to the LMA.
2221 This information is used for symbol lookup, and memory read/write.
2222 For instance, if a section has been mapped then its contents
2223 should be read from the VMA, otherwise from the LMA.
2225 Two levels of debugger support for overlays are available. One is
2226 "manual", in which the debugger relies on the user to tell it which
2227 overlays are currently mapped. This level of support is
2228 implemented entirely in the core debugger, and the information about
2229 whether a section is mapped is kept in the objfile->obj_section table.
2231 The second level of support is "automatic", and is only available if
2232 the target-specific code provides functionality to read the target's
2233 overlay mapping table, and translate its contents for the debugger
2234 (by updating the mapped state information in the obj_section tables).
2236 The interface is as follows:
2238 overlay map <name> -- tell gdb to consider this section mapped
2239 overlay unmap <name> -- tell gdb to consider this section unmapped
2240 overlay list -- list the sections that GDB thinks are mapped
2241 overlay read-target -- get the target's state of what's mapped
2242 overlay off/manual/auto -- set overlay debugging state
2243 Functional interface:
2244 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2245 section, return that section.
2246 find_pc_overlay(pc): find any overlay section that contains
2247 the pc, either in its VMA or its LMA
2248 overlay_is_mapped(sect): true if overlay is marked as mapped
2249 section_is_overlay(sect): true if section's VMA != LMA
2250 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2251 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2252 overlay_mapped_address(...): map an address from section's LMA to VMA
2253 overlay_unmapped_address(...): map an address from section's VMA to LMA
2254 symbol_overlayed_address(...): Return a "current" address for symbol:
2255 either in VMA or LMA depending on whether
2256 the symbol's section is currently mapped
2259 /* Overlay debugging state: */
2261 int overlay_debugging = 0; /* 0 == off, 1 == manual, -1 == auto */
2262 int overlay_cache_invalid = 0; /* True if need to refresh mapped state */
2264 /* Target vector for refreshing overlay mapped state */
2265 static void simple_overlay_update PARAMS ((struct obj_section *));
2266 void (*target_overlay_update) PARAMS ((struct obj_section *))
2267 = simple_overlay_update;
2269 /* Function: section_is_overlay (SECTION)
2270 Returns true if SECTION has VMA not equal to LMA, ie.
2271 SECTION is loaded at an address different from where it will "run". */
2274 section_is_overlay (section)
2277 if (overlay_debugging)
2278 if (section && section->lma != 0 &&
2279 section->vma != section->lma)
2285 /* Function: overlay_invalidate_all (void)
2286 Invalidate the mapped state of all overlay sections (mark it as stale). */
2289 overlay_invalidate_all ()
2291 struct objfile *objfile;
2292 struct obj_section *sect;
2294 ALL_OBJSECTIONS (objfile, sect)
2295 if (section_is_overlay (sect->the_bfd_section))
2296 sect->ovly_mapped = -1;
2299 /* Function: overlay_is_mapped (SECTION)
2300 Returns true if section is an overlay, and is currently mapped.
2301 Private: public access is thru function section_is_mapped.
2303 Access to the ovly_mapped flag is restricted to this function, so
2304 that we can do automatic update. If the global flag
2305 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2306 overlay_invalidate_all. If the mapped state of the particular
2307 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2310 overlay_is_mapped (osect)
2311 struct obj_section *osect;
2313 if (osect == 0 || !section_is_overlay (osect->the_bfd_section))
2316 switch (overlay_debugging)
2319 case 0: return 0; /* overlay debugging off */
2320 case -1: /* overlay debugging automatic */
2321 /* Unles there is a target_overlay_update function,
2322 there's really nothing useful to do here (can't really go auto) */
2323 if (target_overlay_update)
2325 if (overlay_cache_invalid)
2327 overlay_invalidate_all ();
2328 overlay_cache_invalid = 0;
2330 if (osect->ovly_mapped == -1)
2331 (*target_overlay_update) (osect);
2333 /* fall thru to manual case */
2334 case 1: /* overlay debugging manual */
2335 return osect->ovly_mapped == 1;
2339 /* Function: section_is_mapped
2340 Returns true if section is an overlay, and is currently mapped. */
2343 section_is_mapped (section)
2346 struct objfile *objfile;
2347 struct obj_section *osect;
2349 if (overlay_debugging)
2350 if (section && section_is_overlay (section))
2351 ALL_OBJSECTIONS (objfile, osect)
2352 if (osect->the_bfd_section == section)
2353 return overlay_is_mapped (osect);
2358 /* Function: pc_in_unmapped_range
2359 If PC falls into the lma range of SECTION, return true, else false. */
2362 pc_in_unmapped_range (pc, section)
2368 if (overlay_debugging)
2369 if (section && section_is_overlay (section))
2371 size = bfd_get_section_size_before_reloc (section);
2372 if (section->lma <= pc && pc < section->lma + size)
2378 /* Function: pc_in_mapped_range
2379 If PC falls into the vma range of SECTION, return true, else false. */
2382 pc_in_mapped_range (pc, section)
2388 if (overlay_debugging)
2389 if (section && section_is_overlay (section))
2391 size = bfd_get_section_size_before_reloc (section);
2392 if (section->vma <= pc && pc < section->vma + size)
2398 /* Function: overlay_unmapped_address (PC, SECTION)
2399 Returns the address corresponding to PC in the unmapped (load) range.
2400 May be the same as PC. */
2403 overlay_unmapped_address (pc, section)
2407 if (overlay_debugging)
2408 if (section && section_is_overlay (section) &&
2409 pc_in_mapped_range (pc, section))
2410 return pc + section->lma - section->vma;
2415 /* Function: overlay_mapped_address (PC, SECTION)
2416 Returns the address corresponding to PC in the mapped (runtime) range.
2417 May be the same as PC. */
2420 overlay_mapped_address (pc, section)
2424 if (overlay_debugging)
2425 if (section && section_is_overlay (section) &&
2426 pc_in_unmapped_range (pc, section))
2427 return pc + section->vma - section->lma;
2433 /* Function: symbol_overlayed_address
2434 Return one of two addresses (relative to the VMA or to the LMA),
2435 depending on whether the section is mapped or not. */
2438 symbol_overlayed_address (address, section)
2442 if (overlay_debugging)
2444 /* If the symbol has no section, just return its regular address. */
2447 /* If the symbol's section is not an overlay, just return its address */
2448 if (!section_is_overlay (section))
2450 /* If the symbol's section is mapped, just return its address */
2451 if (section_is_mapped (section))
2454 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
2455 * then return its LOADED address rather than its vma address!!
2457 return overlay_unmapped_address (address, section);
2462 /* Function: find_pc_overlay (PC)
2463 Return the best-match overlay section for PC:
2464 If PC matches a mapped overlay section's VMA, return that section.
2465 Else if PC matches an unmapped section's VMA, return that section.
2466 Else if PC matches an unmapped section's LMA, return that section. */
2469 find_pc_overlay (pc)
2472 struct objfile *objfile;
2473 struct obj_section *osect, *best_match = NULL;
2475 if (overlay_debugging)
2476 ALL_OBJSECTIONS (objfile, osect)
2477 if (section_is_overlay (osect->the_bfd_section))
2479 if (pc_in_mapped_range (pc, osect->the_bfd_section))
2481 if (overlay_is_mapped (osect))
2482 return osect->the_bfd_section;
2486 else if (pc_in_unmapped_range (pc, osect->the_bfd_section))
2489 return best_match ? best_match->the_bfd_section : NULL;
2492 /* Function: find_pc_mapped_section (PC)
2493 If PC falls into the VMA address range of an overlay section that is
2494 currently marked as MAPPED, return that section. Else return NULL. */
2497 find_pc_mapped_section (pc)
2500 struct objfile *objfile;
2501 struct obj_section *osect;
2503 if (overlay_debugging)
2504 ALL_OBJSECTIONS (objfile, osect)
2505 if (pc_in_mapped_range (pc, osect->the_bfd_section) &&
2506 overlay_is_mapped (osect))
2507 return osect->the_bfd_section;
2512 /* Function: list_overlays_command
2513 Print a list of mapped sections and their PC ranges */
2516 list_overlays_command (args, from_tty)
2521 struct objfile *objfile;
2522 struct obj_section *osect;
2524 if (overlay_debugging)
2525 ALL_OBJSECTIONS (objfile, osect)
2526 if (overlay_is_mapped (osect))
2532 vma = bfd_section_vma (objfile->obfd, osect->the_bfd_section);
2533 lma = bfd_section_lma (objfile->obfd, osect->the_bfd_section);
2534 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2535 name = bfd_section_name (objfile->obfd, osect->the_bfd_section);
2537 printf_filtered ("Section %s, loaded at ", name);
2538 print_address_numeric (lma, 1, gdb_stdout);
2539 puts_filtered (" - ");
2540 print_address_numeric (lma + size, 1, gdb_stdout);
2541 printf_filtered (", mapped at ");
2542 print_address_numeric (vma, 1, gdb_stdout);
2543 puts_filtered (" - ");
2544 print_address_numeric (vma + size, 1, gdb_stdout);
2545 puts_filtered ("\n");
2550 printf_filtered ("No sections are mapped.\n");
2553 /* Function: map_overlay_command
2554 Mark the named section as mapped (ie. residing at its VMA address). */
2557 map_overlay_command (args, from_tty)
2561 struct objfile *objfile, *objfile2;
2562 struct obj_section *sec, *sec2;
2565 if (!overlay_debugging)
2566 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2568 if (args == 0 || *args == 0)
2569 error ("Argument required: name of an overlay section");
2571 /* First, find a section matching the user supplied argument */
2572 ALL_OBJSECTIONS (objfile, sec)
2573 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
2575 /* Now, check to see if the section is an overlay. */
2576 bfdsec = sec->the_bfd_section;
2577 if (!section_is_overlay (bfdsec))
2578 continue; /* not an overlay section */
2580 /* Mark the overlay as "mapped" */
2581 sec->ovly_mapped = 1;
2583 /* Next, make a pass and unmap any sections that are
2584 overlapped by this new section: */
2585 ALL_OBJSECTIONS (objfile2, sec2)
2586 if (sec2->ovly_mapped &&
2588 sec->the_bfd_section != sec2->the_bfd_section &&
2589 (pc_in_mapped_range (sec2->addr, sec->the_bfd_section) ||
2590 pc_in_mapped_range (sec2->endaddr, sec->the_bfd_section)))
2593 printf_filtered ("Note: section %s unmapped by overlap\n",
2594 bfd_section_name (objfile->obfd,
2595 sec2->the_bfd_section));
2596 sec2->ovly_mapped = 0; /* sec2 overlaps sec: unmap sec2 */
2600 error ("No overlay section called %s", args);
2603 /* Function: unmap_overlay_command
2604 Mark the overlay section as unmapped
2605 (ie. resident in its LMA address range, rather than the VMA range). */
2608 unmap_overlay_command (args, from_tty)
2612 struct objfile *objfile;
2613 struct obj_section *sec;
2615 if (!overlay_debugging)
2616 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2618 if (args == 0 || *args == 0)
2619 error ("Argument required: name of an overlay section");
2621 /* First, find a section matching the user supplied argument */
2622 ALL_OBJSECTIONS (objfile, sec)
2623 if (!strcmp (bfd_section_name (objfile->obfd, sec->the_bfd_section), args))
2625 if (!sec->ovly_mapped)
2626 error ("Section %s is not mapped", args);
2627 sec->ovly_mapped = 0;
2630 error ("No overlay section called %s", args);
2633 /* Function: overlay_auto_command
2634 A utility command to turn on overlay debugging.
2635 Possibly this should be done via a set/show command. */
2638 overlay_auto_command (args, from_tty)
2642 overlay_debugging = -1;
2644 printf_filtered ("Automatic overlay debugging enabled.");
2647 /* Function: overlay_manual_command
2648 A utility command to turn on overlay debugging.
2649 Possibly this should be done via a set/show command. */
2652 overlay_manual_command (args, from_tty)
2656 overlay_debugging = 1;
2658 printf_filtered ("Overlay debugging enabled.");
2661 /* Function: overlay_off_command
2662 A utility command to turn on overlay debugging.
2663 Possibly this should be done via a set/show command. */
2666 overlay_off_command (args, from_tty)
2670 overlay_debugging = 0;
2672 printf_filtered ("Overlay debugging disabled.");
2676 overlay_load_command (args, from_tty)
2680 if (target_overlay_update)
2681 (*target_overlay_update) (NULL);
2683 error ("This target does not know how to read its overlay state.");
2686 /* Function: overlay_command
2687 A place-holder for a mis-typed command */
2689 /* Command list chain containing all defined "overlay" subcommands. */
2690 struct cmd_list_element *overlaylist;
2693 overlay_command (args, from_tty)
2698 ("\"overlay\" must be followed by the name of an overlay command.\n");
2699 help_list (overlaylist, "overlay ", -1, gdb_stdout);
2703 /* Target Overlays for the "Simplest" overlay manager:
2705 This is GDB's default target overlay layer. It works with the
2706 minimal overlay manager supplied as an example by Cygnus. The
2707 entry point is via a function pointer "target_overlay_update",
2708 so targets that use a different runtime overlay manager can
2709 substitute their own overlay_update function and take over the
2712 The overlay_update function pokes around in the target's data structures
2713 to see what overlays are mapped, and updates GDB's overlay mapping with
2716 In this simple implementation, the target data structures are as follows:
2717 unsigned _novlys; /# number of overlay sections #/
2718 unsigned _ovly_table[_novlys][4] = {
2719 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
2720 {..., ..., ..., ...},
2722 unsigned _novly_regions; /# number of overlay regions #/
2723 unsigned _ovly_region_table[_novly_regions][3] = {
2724 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
2727 These functions will attempt to update GDB's mappedness state in the
2728 symbol section table, based on the target's mappedness state.
2730 To do this, we keep a cached copy of the target's _ovly_table, and
2731 attempt to detect when the cached copy is invalidated. The main
2732 entry point is "simple_overlay_update(SECT), which looks up SECT in
2733 the cached table and re-reads only the entry for that section from
2734 the target (whenever possible).
2737 /* Cached, dynamically allocated copies of the target data structures: */
2738 static unsigned (*cache_ovly_table)[4] = 0;
2740 static unsigned (*cache_ovly_region_table)[3] = 0;
2742 static unsigned cache_novlys = 0;
2744 static unsigned cache_novly_regions = 0;
2746 static CORE_ADDR cache_ovly_table_base = 0;
2748 static CORE_ADDR cache_ovly_region_table_base = 0;
2750 enum ovly_index { VMA, SIZE, LMA, MAPPED};
2751 #define TARGET_LONG_BYTES (TARGET_LONG_BIT / TARGET_CHAR_BIT)
2753 /* Throw away the cached copy of _ovly_table */
2755 simple_free_overlay_table ()
2757 if (cache_ovly_table)
2758 free(cache_ovly_table);
2760 cache_ovly_table = NULL;
2761 cache_ovly_table_base = 0;
2765 /* Throw away the cached copy of _ovly_region_table */
2767 simple_free_overlay_region_table ()
2769 if (cache_ovly_region_table)
2770 free(cache_ovly_region_table);
2771 cache_novly_regions = 0;
2772 cache_ovly_region_table = NULL;
2773 cache_ovly_region_table_base = 0;
2777 /* Read an array of ints from the target into a local buffer.
2778 Convert to host order. int LEN is number of ints */
2780 read_target_long_array (memaddr, myaddr, len)
2782 unsigned int *myaddr;
2785 char *buf = alloca (len * TARGET_LONG_BYTES);
2788 read_memory (memaddr, buf, len * TARGET_LONG_BYTES);
2789 for (i = 0; i < len; i++)
2790 myaddr[i] = extract_unsigned_integer (TARGET_LONG_BYTES * i + buf,
2794 /* Find and grab a copy of the target _ovly_table
2795 (and _novlys, which is needed for the table's size) */
2797 simple_read_overlay_table ()
2799 struct minimal_symbol *msym;
2801 simple_free_overlay_table ();
2802 msym = lookup_minimal_symbol ("_novlys", 0, 0);
2804 cache_novlys = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
2806 return 0; /* failure */
2807 cache_ovly_table = (void *) xmalloc (cache_novlys * sizeof(*cache_ovly_table));
2808 if (cache_ovly_table != NULL)
2810 msym = lookup_minimal_symbol ("_ovly_table", 0, 0);
2813 cache_ovly_table_base = SYMBOL_VALUE_ADDRESS (msym);
2814 read_target_long_array (cache_ovly_table_base,
2815 (int *) cache_ovly_table,
2819 return 0; /* failure */
2822 return 0; /* failure */
2823 return 1; /* SUCCESS */
2827 /* Find and grab a copy of the target _ovly_region_table
2828 (and _novly_regions, which is needed for the table's size) */
2830 simple_read_overlay_region_table ()
2832 struct minimal_symbol *msym;
2834 simple_free_overlay_region_table ();
2835 msym = lookup_minimal_symbol ("_novly_regions", 0, 0);
2837 cache_novly_regions = read_memory_integer (SYMBOL_VALUE_ADDRESS (msym), 4);
2839 return 0; /* failure */
2840 cache_ovly_region_table = (void *) xmalloc (cache_novly_regions * 12);
2841 if (cache_ovly_region_table != NULL)
2843 msym = lookup_minimal_symbol ("_ovly_region_table", 0, 0);
2846 cache_ovly_region_table_base = SYMBOL_VALUE_ADDRESS (msym);
2847 read_target_long_array (cache_ovly_region_table_base,
2848 (int *) cache_ovly_region_table,
2849 cache_novly_regions * 3);
2852 return 0; /* failure */
2855 return 0; /* failure */
2856 return 1; /* SUCCESS */
2860 /* Function: simple_overlay_update_1
2861 A helper function for simple_overlay_update. Assuming a cached copy
2862 of _ovly_table exists, look through it to find an entry whose vma,
2863 lma and size match those of OSECT. Re-read the entry and make sure
2864 it still matches OSECT (else the table may no longer be valid).
2865 Set OSECT's mapped state to match the entry. Return: 1 for
2866 success, 0 for failure. */
2869 simple_overlay_update_1 (osect)
2870 struct obj_section *osect;
2874 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2875 for (i = 0; i < cache_novlys; i++)
2876 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
2877 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
2878 cache_ovly_table[i][SIZE] == size */)
2880 read_target_long_array (cache_ovly_table_base + i * TARGET_LONG_BYTES,
2881 (int *) cache_ovly_table[i], 4);
2882 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
2883 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
2884 cache_ovly_table[i][SIZE] == size */)
2886 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
2889 else /* Warning! Warning! Target's ovly table has changed! */
2895 /* Function: simple_overlay_update
2896 If OSECT is NULL, then update all sections' mapped state
2897 (after re-reading the entire target _ovly_table).
2898 If OSECT is non-NULL, then try to find a matching entry in the
2899 cached ovly_table and update only OSECT's mapped state.
2900 If a cached entry can't be found or the cache isn't valid, then
2901 re-read the entire cache, and go ahead and update all sections. */
2904 simple_overlay_update (osect)
2905 struct obj_section *osect;
2907 struct objfile *objfile;
2909 /* Were we given an osect to look up? NULL means do all of them. */
2911 /* Have we got a cached copy of the target's overlay table? */
2912 if (cache_ovly_table != NULL)
2913 /* Does its cached location match what's currently in the symtab? */
2914 if (cache_ovly_table_base ==
2915 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", 0, 0)))
2916 /* Then go ahead and try to look up this single section in the cache */
2917 if (simple_overlay_update_1 (osect))
2918 /* Found it! We're done. */
2921 /* Cached table no good: need to read the entire table anew.
2922 Or else we want all the sections, in which case it's actually
2923 more efficient to read the whole table in one block anyway. */
2925 if (simple_read_overlay_table () == 0) /* read failed? No table? */
2927 warning ("Failed to read the target overlay mapping table.");
2930 /* Now may as well update all sections, even if only one was requested. */
2931 ALL_OBJSECTIONS (objfile, osect)
2932 if (section_is_overlay (osect->the_bfd_section))
2936 size = bfd_get_section_size_before_reloc (osect->the_bfd_section);
2937 for (i = 0; i < cache_novlys; i++)
2938 if (cache_ovly_table[i][VMA] == osect->the_bfd_section->vma &&
2939 cache_ovly_table[i][LMA] == osect->the_bfd_section->lma /* &&
2940 cache_ovly_table[i][SIZE] == size */)
2941 { /* obj_section matches i'th entry in ovly_table */
2942 osect->ovly_mapped = cache_ovly_table[i][MAPPED];
2943 break; /* finished with inner for loop: break out */
2950 _initialize_symfile ()
2952 struct cmd_list_element *c;
2954 c = add_cmd ("symbol-file", class_files, symbol_file_command,
2955 "Load symbol table from executable file FILE.\n\
2956 The `file' command can also load symbol tables, as well as setting the file\n\
2957 to execute.", &cmdlist);
2958 c->completer = filename_completer;
2960 c = add_cmd ("add-symbol-file", class_files, add_symbol_file_command,
2961 "Usage: add-symbol-file FILE ADDR\n\
2962 Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
2963 ADDR is the starting address of the file's text.",
2965 c->completer = filename_completer;
2967 c = add_cmd ("add-shared-symbol-files", class_files,
2968 add_shared_symbol_files_command,
2969 "Load the symbols from shared objects in the dynamic linker's link map.",
2971 c = add_alias_cmd ("assf", "add-shared-symbol-files", class_files, 1,
2974 c = add_cmd ("load", class_files, load_command,
2975 "Dynamically load FILE into the running program, and record its symbols\n\
2976 for access from GDB.", &cmdlist);
2977 c->completer = filename_completer;
2980 (add_set_cmd ("symbol-reloading", class_support, var_boolean,
2981 (char *)&symbol_reloading,
2982 "Set dynamic symbol table reloading multiple times in one run.",
2986 add_prefix_cmd ("overlay", class_support, overlay_command,
2987 "Commands for debugging overlays.", &overlaylist,
2988 "overlay ", 0, &cmdlist);
2990 add_com_alias ("ovly", "overlay", class_alias, 1);
2991 add_com_alias ("ov", "overlay", class_alias, 1);
2993 add_cmd ("map-overlay", class_support, map_overlay_command,
2994 "Assert that an overlay section is mapped.", &overlaylist);
2996 add_cmd ("unmap-overlay", class_support, unmap_overlay_command,
2997 "Assert that an overlay section is unmapped.", &overlaylist);
2999 add_cmd ("list-overlays", class_support, list_overlays_command,
3000 "List mappings of overlay sections.", &overlaylist);
3002 add_cmd ("manual", class_support, overlay_manual_command,
3003 "Enable overlay debugging.", &overlaylist);
3004 add_cmd ("off", class_support, overlay_off_command,
3005 "Disable overlay debugging.", &overlaylist);
3006 add_cmd ("auto", class_support, overlay_auto_command,
3007 "Enable automatic overlay debugging.", &overlaylist);
3008 add_cmd ("load-target", class_support, overlay_load_command,
3009 "Read the overlay mapping state from the target.", &overlaylist);
3011 /* Filename extension to source language lookup table: */
3012 init_filename_language_table ();
3013 c = add_set_cmd ("extension-language", class_files, var_string_noescape,
3015 "Set mapping between filename extension and source language.\n\
3016 Usage: set extension-language .foo bar",
3018 c->function.cfunc = set_ext_lang_command;
3020 add_info ("extensions", info_ext_lang_command,
3021 "All filename extensions associated with a source language.");