1 /* Generic symbol file reading for the GNU debugger, GDB.
2 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998
3 Free Software Foundation, Inc.
4 Contributed by Cygnus Support, using pieces from other GDB modules.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
33 #include "breakpoint.h"
35 #include "complaints.h"
37 #include "inferior.h" /* for write_pc */
38 #include "gdb-stabs.h"
42 #include <sys/types.h>
44 #include "gdb_string.h"
55 /* Some HP-UX related globals to clear when a new "main"
56 symbol file is loaded. HP-specific. */
58 extern int hp_som_som_object_present
;
59 extern int hp_cxx_exception_support_initialized
;
60 #define RESET_HP_UX_GLOBALS() do {\
61 hp_som_som_object_present = 0; /* indicates HP-compiled code */ \
62 hp_cxx_exception_support_initialized = 0; /* must reinitialize exception stuff */ \
66 int (*ui_load_progress_hook
) PARAMS ((char *, unsigned long));
67 void (*pre_add_symbol_hook
) PARAMS ((char *));
68 void (*post_add_symbol_hook
) PARAMS ((void));
70 /* Global variables owned by this file */
71 int readnow_symbol_files
; /* Read full symbols immediately */
73 struct complaint oldsyms_complaint
=
75 "Replacing old symbols for `%s'", 0, 0
78 struct complaint empty_symtab_complaint
=
80 "Empty symbol table found for `%s'", 0, 0
83 /* 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 static void add_filename_language
PARAMS ((char *ext
, enum language lang
));
147 static void set_ext_lang_command
PARAMS ((char *args
, int from_tty
));
149 static void info_ext_lang_command
PARAMS ((char *args
, int from_tty
));
151 static void init_filename_language_table
PARAMS ((void));
153 void _initialize_symfile
PARAMS ((void));
155 /* List of all available sym_fns. On gdb startup, each object file reader
156 calls add_symtab_fns() to register information on each format it is
159 static struct sym_fns
*symtab_fns
= NULL
;
161 /* Flag for whether user will be reloading symbols multiple times.
162 Defaults to ON for VxWorks, otherwise OFF. */
164 #ifdef SYMBOL_RELOADING_DEFAULT
165 int symbol_reloading
= SYMBOL_RELOADING_DEFAULT
;
167 int symbol_reloading
= 0;
170 /* If non-zero, then on HP-UX (i.e., platforms that use somsolib.c),
171 this variable is interpreted as a threshhold. If adding a new
172 library's symbol table to those already known to the debugger would
173 exceed this threshhold, then the shlib's symbols are not added.
175 If non-zero on other platforms, shared library symbols will be added
176 automatically when the inferior is created, new libraries are loaded,
177 or when attaching to the inferior. This is almost always what users
178 will want to have happen; but for very large programs, the startup
179 time will be excessive, and so if this is a problem, the user can
180 clear this flag and then add the shared library symbols as needed.
181 Note that there is a potential for confusion, since if the shared
182 library symbols are not loaded, commands like "info fun" will *not*
183 report all the functions that are actually present.
185 Note that HP-UX interprets this variable to mean, "threshhold size
186 in megabytes, where zero means never add". Other platforms interpret
187 this variable to mean, "always add if non-zero, never add if zero."
190 int auto_solib_add
= 1;
193 /* Since this function is called from within qsort, in an ANSI environment
194 it must conform to the prototype for qsort, which specifies that the
195 comparison function takes two "void *" pointers. */
198 compare_symbols (s1p
, s2p
)
202 register struct symbol
**s1
, **s2
;
204 s1
= (struct symbol
**) s1p
;
205 s2
= (struct symbol
**) s2p
;
207 return (STRCMP (SYMBOL_NAME (*s1
), SYMBOL_NAME (*s2
)));
214 compare_psymbols -- compare two partial symbols by name
218 Given pointers to pointers to two partial symbol table entries,
219 compare them by name and return -N, 0, or +N (ala strcmp).
220 Typically used by sorting routines like qsort().
224 Does direct compare of first two characters before punting
225 and passing to strcmp for longer compares. Note that the
226 original version had a bug whereby two null strings or two
227 identically named one character strings would return the
228 comparison of memory following the null byte.
233 compare_psymbols (s1p
, s2p
)
237 register char *st1
= SYMBOL_NAME (*(struct partial_symbol
**) s1p
);
238 register char *st2
= SYMBOL_NAME (*(struct partial_symbol
**) s2p
);
240 if ((st1
[0] - st2
[0]) || !st1
[0])
242 return (st1
[0] - st2
[0]);
244 else if ((st1
[1] - st2
[1]) || !st1
[1])
246 return (st1
[1] - st2
[1]);
250 /* Note: I replaced the STRCMP line (commented out below)
251 * with a simpler "strcmp()" which compares the 2 strings
252 * from the beginning. (STRCMP is a macro which first compares
253 * the initial characters, then falls back on strcmp).
254 * The reason is that the STRCMP line was tickling a C compiler
255 * bug on HP-UX 10.30, which is avoided with the simpler
256 * code. The performance gain from the more complicated code
257 * is negligible, given that we have already checked the
258 * initial 2 characters above. I reported the compiler bug,
259 * and once it is fixed the original line can be put back. RT
261 /* return ( STRCMP (st1 + 2, st2 + 2)); */
262 return (strcmp (st1
, st2
));
267 sort_pst_symbols (pst
)
268 struct partial_symtab
*pst
;
270 /* Sort the global list; don't sort the static list */
272 qsort (pst
->objfile
->global_psymbols
.list
+ pst
->globals_offset
,
273 pst
->n_global_syms
, sizeof (struct partial_symbol
*),
277 /* Call sort_block_syms to sort alphabetically the symbols of one block. */
281 register struct block
*b
;
283 qsort (&BLOCK_SYM (b
, 0), BLOCK_NSYMS (b
),
284 sizeof (struct symbol
*), compare_symbols
);
287 /* Call sort_symtab_syms to sort alphabetically
288 the symbols of each block of one symtab. */
292 register struct symtab
*s
;
294 register struct blockvector
*bv
;
297 register struct block
*b
;
301 bv
= BLOCKVECTOR (s
);
302 nbl
= BLOCKVECTOR_NBLOCKS (bv
);
303 for (i
= 0; i
< nbl
; i
++)
305 b
= BLOCKVECTOR_BLOCK (bv
, i
);
306 if (BLOCK_SHOULD_SORT (b
))
311 /* Make a null terminated copy of the string at PTR with SIZE characters in
312 the obstack pointed to by OBSTACKP . Returns the address of the copy.
313 Note that the string at PTR does not have to be null terminated, I.E. it
314 may be part of a larger string and we are only saving a substring. */
317 obsavestring (ptr
, size
, obstackp
)
320 struct obstack
*obstackp
;
322 register char *p
= (char *) obstack_alloc (obstackp
, size
+ 1);
323 /* Open-coded memcpy--saves function call time. These strings are usually
324 short. FIXME: Is this really still true with a compiler that can
327 register char *p1
= ptr
;
328 register char *p2
= p
;
329 char *end
= ptr
+ size
;
337 /* Concatenate strings S1, S2 and S3; return the new string. Space is found
338 in the obstack pointed to by OBSTACKP. */
341 obconcat (obstackp
, s1
, s2
, s3
)
342 struct obstack
*obstackp
;
343 const char *s1
, *s2
, *s3
;
345 register int len
= strlen (s1
) + strlen (s2
) + strlen (s3
) + 1;
346 register char *val
= (char *) obstack_alloc (obstackp
, len
);
353 /* True if we are nested inside psymtab_to_symtab. */
355 int currently_reading_symtab
= 0;
358 decrement_reading_symtab (dummy
)
361 currently_reading_symtab
--;
364 /* Get the symbol table that corresponds to a partial_symtab.
365 This is fast after the first time you do it. In fact, there
366 is an even faster macro PSYMTAB_TO_SYMTAB that does the fast
370 psymtab_to_symtab (pst
)
371 register struct partial_symtab
*pst
;
373 /* If it's been looked up before, return it. */
377 /* If it has not yet been read in, read it. */
380 struct cleanup
*back_to
= make_cleanup (decrement_reading_symtab
, NULL
);
381 currently_reading_symtab
++;
382 (*pst
->read_symtab
) (pst
);
383 do_cleanups (back_to
);
389 /* Initialize entry point information for this objfile. */
392 init_entry_point_info (objfile
)
393 struct objfile
*objfile
;
395 /* Save startup file's range of PC addresses to help blockframe.c
396 decide where the bottom of the stack is. */
398 if (bfd_get_file_flags (objfile
->obfd
) & EXEC_P
)
400 /* Executable file -- record its entry point so we'll recognize
401 the startup file because it contains the entry point. */
402 objfile
->ei
.entry_point
= bfd_get_start_address (objfile
->obfd
);
406 /* Examination of non-executable.o files. Short-circuit this stuff. */
407 objfile
->ei
.entry_point
= INVALID_ENTRY_POINT
;
409 objfile
->ei
.entry_file_lowpc
= INVALID_ENTRY_LOWPC
;
410 objfile
->ei
.entry_file_highpc
= INVALID_ENTRY_HIGHPC
;
411 objfile
->ei
.entry_func_lowpc
= INVALID_ENTRY_LOWPC
;
412 objfile
->ei
.entry_func_highpc
= INVALID_ENTRY_HIGHPC
;
413 objfile
->ei
.main_func_lowpc
= INVALID_ENTRY_LOWPC
;
414 objfile
->ei
.main_func_highpc
= INVALID_ENTRY_HIGHPC
;
417 /* Get current entry point address. */
420 entry_point_address ()
422 return symfile_objfile
? symfile_objfile
->ei
.entry_point
: 0;
425 /* Remember the lowest-addressed loadable section we've seen.
426 This function is called via bfd_map_over_sections.
428 In case of equal vmas, the section with the largest size becomes the
429 lowest-addressed loadable section.
431 If the vmas and sizes are equal, the last section is considered the
432 lowest-addressed loadable section. */
435 find_lowest_section (abfd
, sect
, obj
)
440 asection
**lowest
= (asection
**) obj
;
442 if (0 == (bfd_get_section_flags (abfd
, sect
) & SEC_LOAD
))
445 *lowest
= sect
; /* First loadable section */
446 else if (bfd_section_vma (abfd
, *lowest
) > bfd_section_vma (abfd
, sect
))
447 *lowest
= sect
; /* A lower loadable section */
448 else if (bfd_section_vma (abfd
, *lowest
) == bfd_section_vma (abfd
, sect
)
449 && (bfd_section_size (abfd
, (*lowest
))
450 <= bfd_section_size (abfd
, sect
)))
454 /* Parse the user's idea of an offset for dynamic linking, into our idea
455 of how to represent it for fast symbol reading. This is the default
456 version of the sym_fns.sym_offsets function for symbol readers that
457 don't need to do anything special. It allocates a section_offsets table
458 for the objectfile OBJFILE and stuffs ADDR into all of the offsets. */
460 struct section_offsets
*
461 default_symfile_offsets (objfile
, addr
)
462 struct objfile
*objfile
;
465 struct section_offsets
*section_offsets
;
468 objfile
->num_sections
= SECT_OFF_MAX
;
469 section_offsets
= (struct section_offsets
*)
470 obstack_alloc (&objfile
->psymbol_obstack
, SIZEOF_SECTION_OFFSETS
);
471 memset (section_offsets
, 0, SIZEOF_SECTION_OFFSETS
);
473 for (i
= 0; i
< SECT_OFF_MAX
; i
++)
474 ANOFFSET (section_offsets
, i
) = addr
;
476 return section_offsets
;
480 /* Process a symbol file, as either the main file or as a dynamically
483 OBJFILE is where the symbols are to be read from.
485 ADDR is the address where the text segment was loaded, unless the
486 objfile is the main symbol file, in which case it is zero.
488 MAINLINE is nonzero if this is the main symbol file, or zero if
489 it's an extra symbol file such as dynamically loaded code.
491 VERBO is nonzero if the caller has printed a verbose message about
492 the symbol reading (and complaints can be 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.
538 We no longer warn if the lowest section is not a text segment (as
539 happens for the PA64 port. */
542 addr
= 0; /* No offset from objfile addresses. */
546 lowest_sect
= bfd_get_section_by_name (objfile
->obfd
, ".text");
547 if (lowest_sect
== NULL
)
548 bfd_map_over_sections (objfile
->obfd
, find_lowest_section
,
551 if (lowest_sect
== NULL
)
552 warning ("no loadable sections found in added symbol-file %s",
556 addr
-= bfd_section_vma (objfile
->obfd
, lowest_sect
);
559 /* Initialize symbol reading routines for this objfile, allow complaints to
560 appear for this new file, and record how verbose to be, then do the
561 initial symbol reading for this file. */
563 (*objfile
->sf
->sym_init
) (objfile
);
564 clear_complaints (1, verbo
);
566 section_offsets
= (*objfile
->sf
->sym_offsets
) (objfile
, addr
);
567 objfile
->section_offsets
= section_offsets
;
569 #ifndef IBM6000_TARGET
570 /* This is a SVR4/SunOS specific hack, I think. In any event, it
571 screws RS/6000. sym_offsets should be doing this sort of thing,
572 because it knows the mapping between bfd sections and
574 /* This is a hack. As far as I can tell, section offsets are not
575 target dependent. They are all set to addr with a couple of
576 exceptions. The exceptions are sysvr4 shared libraries, whose
577 offsets are kept in solib structures anyway and rs6000 xcoff
578 which handles shared libraries in a completely unique way.
580 Section offsets are built similarly, except that they are built
581 by adding addr in all cases because there is no clear mapping
582 from section_offsets into actual sections. Note that solib.c
583 has a different algorithm for finding section offsets.
585 These should probably all be collapsed into some target
586 independent form of shared library support. FIXME. */
590 struct obj_section
*s
;
592 ALL_OBJFILE_OSECTIONS (objfile
, s
)
594 s
->addr
-= s
->offset
;
596 s
->endaddr
-= s
->offset
;
601 #endif /* not IBM6000_TARGET */
603 (*objfile
->sf
->sym_read
) (objfile
, mainline
);
605 if (!have_partial_symbols () && !have_full_symbols ())
608 printf_filtered ("(no debugging symbols found)...");
612 /* Don't allow char * to have a typename (else would get caddr_t).
613 Ditto void *. FIXME: Check whether this is now done by all the
614 symbol readers themselves (many of them now do), and if so remove
617 TYPE_NAME (lookup_pointer_type (builtin_type_char
)) = 0;
618 TYPE_NAME (lookup_pointer_type (builtin_type_void
)) = 0;
620 /* Mark the objfile has having had initial symbol read attempted. Note
621 that this does not mean we found any symbols... */
623 objfile
->flags
|= OBJF_SYMS
;
625 /* Discard cleanups as symbol reading was successful. */
627 discard_cleanups (old_chain
);
629 /* Call this after reading in a new symbol table to give target
630 dependant code a crack at the new symbols. For instance, this
631 could be used to update the values of target-specific symbols GDB
632 needs to keep track of (such as _sigtramp, or whatever). */
634 TARGET_SYMFILE_POSTREAD (objfile
);
637 /* Perform required actions after either reading in the initial
638 symbols for a new objfile, or mapping in the symbols from a reusable
642 new_symfile_objfile (objfile
, mainline
, verbo
)
643 struct objfile
*objfile
;
648 /* If this is the main symbol file we have to clean up all users of the
649 old main symbol file. Otherwise it is sufficient to fixup all the
650 breakpoints that may have been redefined by this symbol file. */
653 /* OK, make it the "real" symbol file. */
654 symfile_objfile
= objfile
;
656 clear_symtab_users ();
660 breakpoint_re_set ();
663 /* We're done reading the symbol file; finish off complaints. */
664 clear_complaints (0, verbo
);
667 /* Process a symbol file, as either the main file or as a dynamically
670 NAME is the file name (which will be tilde-expanded and made
671 absolute herein) (but we don't free or modify NAME itself).
672 FROM_TTY says how verbose to be. MAINLINE specifies whether this
673 is the main symbol file, or whether it's an extra symbol file such
674 as dynamically loaded code. If !mainline, ADDR is the address
675 where the text segment was loaded.
677 USER_LOADED is TRUE if the add-symbol-file command was how this
678 symbol file came to be processed.
680 IS_SOLIB is TRUE if this symbol file represents a solib, as discovered
681 by the target's implementation of the solib package.
683 Upon success, returns a pointer to the objfile that was added.
684 Upon failure, jumps back to command level (never returns). */
687 symbol_file_add (name
, from_tty
, addr
, mainline
, mapped
, readnow
, user_loaded
, is_solib
)
697 struct objfile
*objfile
;
698 struct partial_symtab
*psymtab
;
701 /* Open a bfd for the file, and give user a chance to burp if we'd be
702 interactively wiping out any existing symbols. */
704 abfd
= symfile_bfd_open (name
);
706 if ((have_full_symbols () || have_partial_symbols ())
709 && !query ("Load new symbol table from \"%s\"? ", name
))
710 error ("Not confirmed.");
712 objfile
= allocate_objfile (abfd
, mapped
, user_loaded
, is_solib
);
714 /* If the objfile uses a mapped symbol file, and we have a psymtab for
715 it, then skip reading any symbols at this time. */
717 if ((objfile
->flags
& OBJF_MAPPED
) && (objfile
->flags
& OBJF_SYMS
))
719 /* We mapped in an existing symbol table file that already has had
720 initial symbol reading performed, so we can skip that part. Notify
721 the user that instead of reading the symbols, they have been mapped.
723 if (from_tty
|| info_verbose
)
725 printf_filtered ("Mapped symbols for %s...", name
);
727 gdb_flush (gdb_stdout
);
729 init_entry_point_info (objfile
);
730 find_sym_fns (objfile
);
734 /* We either created a new mapped symbol table, mapped an existing
735 symbol table file which has not had initial symbol reading
736 performed, or need to read an unmapped symbol table. */
737 if (from_tty
|| info_verbose
)
739 if (pre_add_symbol_hook
)
740 pre_add_symbol_hook (name
);
743 printf_filtered ("Reading symbols from %s...", name
);
745 gdb_flush (gdb_stdout
);
748 syms_from_objfile (objfile
, addr
, mainline
, from_tty
);
751 /* We now have at least a partial symbol table. Check to see if the
752 user requested that all symbols be read on initial access via either
753 the gdb startup command line or on a per symbol file basis. Expand
754 all partial symbol tables for this objfile if so. */
756 if (readnow
|| readnow_symbol_files
)
758 if (from_tty
|| info_verbose
)
760 printf_filtered ("expanding to full symbols...");
762 gdb_flush (gdb_stdout
);
765 for (psymtab
= objfile
->psymtabs
;
767 psymtab
= psymtab
->next
)
769 psymtab_to_symtab (psymtab
);
773 if (from_tty
|| info_verbose
)
775 if (post_add_symbol_hook
)
776 post_add_symbol_hook ();
779 printf_filtered ("done.\n");
780 gdb_flush (gdb_stdout
);
784 new_symfile_objfile (objfile
, mainline
, from_tty
);
786 target_new_objfile (objfile
);
791 /* This is the symbol-file command. Read the file, analyze its
792 symbols, and add a struct symtab to a symtab list. The syntax of
793 the command is rather bizarre--(1) buildargv implements various
794 quoting conventions which are undocumented and have little or
795 nothing in common with the way things are quoted (or not quoted)
796 elsewhere in GDB, (2) options are used, which are not generally
797 used in GDB (perhaps "set mapped on", "set readnow on" would be
798 better), (3) the order of options matters, which is contrary to GNU
799 conventions (because it is confusing and inconvenient). */
802 symbol_file_command (args
, from_tty
)
808 CORE_ADDR text_relocation
= 0; /* text_relocation */
809 struct cleanup
*cleanups
;
817 if ((have_full_symbols () || have_partial_symbols ())
819 && !query ("Discard symbol table from `%s'? ",
820 symfile_objfile
->name
))
821 error ("Not confirmed.");
822 free_all_objfiles ();
824 /* solib descriptors may have handles to objfiles. Since their
825 storage has just been released, we'd better wipe the solib
828 #if defined(SOLIB_RESTART)
832 symfile_objfile
= NULL
;
835 printf_unfiltered ("No symbol file now.\n");
838 RESET_HP_UX_GLOBALS ();
843 if ((argv
= buildargv (args
)) == NULL
)
847 cleanups
= make_cleanup_freeargv (argv
);
848 while (*argv
!= NULL
)
850 if (STREQ (*argv
, "-mapped"))
854 else if (STREQ (*argv
, "-readnow"))
858 else if (**argv
== '-')
860 error ("unknown option `%s'", *argv
);
868 /* this is for rombug remote only, to get the text relocation by
869 using link command */
870 p
= strrchr (name
, '/');
876 target_link (p
, &text_relocation
);
878 if (text_relocation
== (CORE_ADDR
) 0)
880 else if (text_relocation
== (CORE_ADDR
) -1)
882 symbol_file_add (name
, from_tty
, (CORE_ADDR
) 0,
883 1, mapped
, readnow
, 1, 0);
885 RESET_HP_UX_GLOBALS ();
889 symbol_file_add (name
, from_tty
, (CORE_ADDR
) text_relocation
,
890 0, mapped
, readnow
, 1, 0);
892 /* Getting new symbols may change our opinion about what is
894 reinit_frame_cache ();
896 set_initial_language ();
903 error ("no symbol file name was specified");
905 TUIDO (((TuiOpaqueFuncPtr
) tuiDisplayMainFunction
));
906 do_cleanups (cleanups
);
910 /* Set the initial language.
912 A better solution would be to record the language in the psymtab when reading
913 partial symbols, and then use it (if known) to set the language. This would
914 be a win for formats that encode the language in an easily discoverable place,
915 such as DWARF. For stabs, we can jump through hoops looking for specially
916 named symbols or try to intuit the language from the specific type of stabs
917 we find, but we can't do that until later when we read in full symbols.
921 set_initial_language ()
923 struct partial_symtab
*pst
;
924 enum language lang
= language_unknown
;
926 pst
= find_main_psymtab ();
929 if (pst
->filename
!= NULL
)
931 lang
= deduce_language_from_filename (pst
->filename
);
933 if (lang
== language_unknown
)
935 /* Make C the default language */
939 expected_language
= current_language
; /* Don't warn the user */
943 /* Open file specified by NAME and hand it off to BFD for preliminary
944 analysis. Result is a newly initialized bfd *, which includes a newly
945 malloc'd` copy of NAME (tilde-expanded and made absolute).
946 In case of trouble, error() is called. */
949 symfile_bfd_open (name
)
958 name
= tilde_expand (name
); /* Returns 1st new malloc'd copy */
960 /* Look down path for it, allocate 2nd new malloc'd copy. */
961 desc
= openp (getenv ("PATH"), 1, name
, O_RDONLY
| O_BINARY
, 0, &absolute_name
);
962 #if defined(__GO32__) || defined(_WIN32)
965 char *exename
= alloca (strlen (name
) + 5);
966 strcat (strcpy (exename
, name
), ".exe");
967 desc
= openp (getenv ("PATH"), 1, exename
, O_RDONLY
| O_BINARY
,
973 make_cleanup (free
, name
);
974 perror_with_name (name
);
976 free (name
); /* Free 1st new malloc'd copy */
977 name
= absolute_name
; /* Keep 2nd malloc'd copy in bfd */
978 /* It'll be freed in free_objfile(). */
980 sym_bfd
= bfd_fdopenr (name
, gnutarget
, desc
);
984 make_cleanup (free
, name
);
985 error ("\"%s\": can't open to read symbols: %s.", name
,
986 bfd_errmsg (bfd_get_error ()));
988 sym_bfd
->cacheable
= true;
990 if (!bfd_check_format (sym_bfd
, bfd_object
))
992 /* FIXME: should be checking for errors from bfd_close (for one thing,
993 on error it does not free all the storage associated with the
995 bfd_close (sym_bfd
); /* This also closes desc */
996 make_cleanup (free
, name
);
997 error ("\"%s\": can't read symbols: %s.", name
,
998 bfd_errmsg (bfd_get_error ()));
1003 /* Link a new symtab_fns into the global symtab_fns list. Called on gdb
1004 startup by the _initialize routine in each object file format reader,
1005 to register information about each format the the reader is prepared
1012 sf
->next
= symtab_fns
;
1017 /* Initialize to read symbols from the symbol file sym_bfd. It either
1018 returns or calls error(). The result is an initialized struct sym_fns
1019 in the objfile structure, that contains cached information about the
1023 find_sym_fns (objfile
)
1024 struct objfile
*objfile
;
1027 enum bfd_flavour our_flavour
= bfd_get_flavour (objfile
->obfd
);
1028 char *our_target
= bfd_get_target (objfile
->obfd
);
1030 /* Special kludge for RS/6000 and PowerMac. See xcoffread.c. */
1031 if (STREQ (our_target
, "aixcoff-rs6000") ||
1032 STREQ (our_target
, "xcoff-powermac"))
1033 our_flavour
= (enum bfd_flavour
) -1;
1035 /* Special kludge for apollo. See dstread.c. */
1036 if (STREQN (our_target
, "apollo", 6))
1037 our_flavour
= (enum bfd_flavour
) -2;
1039 for (sf
= symtab_fns
; sf
!= NULL
; sf
= sf
->next
)
1041 if (our_flavour
== sf
->sym_flavour
)
1047 error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.",
1048 bfd_get_target (objfile
->obfd
));
1051 /* This function runs the load command of our current target. */
1054 load_command (arg
, from_tty
)
1059 arg
= get_exec_file (1);
1060 target_load (arg
, from_tty
);
1063 /* This version of "load" should be usable for any target. Currently
1064 it is just used for remote targets, not inftarg.c or core files,
1065 on the theory that only in that case is it useful.
1067 Avoiding xmodem and the like seems like a win (a) because we don't have
1068 to worry about finding it, and (b) On VMS, fork() is very slow and so
1069 we don't want to run a subprocess. On the other hand, I'm not sure how
1070 performance compares. */
1071 #define GENERIC_LOAD_CHUNK 256
1072 #define VALIDATE_DOWNLOAD 0
1074 generic_load (filename
, from_tty
)
1078 struct cleanup
*old_cleanups
;
1081 time_t start_time
, end_time
; /* Start and end times of download */
1082 unsigned long data_count
= 0; /* Number of bytes transferred to memory */
1084 unsigned long load_offset
= 0; /* offset to add to vma for each section */
1085 char buf
[GENERIC_LOAD_CHUNK
+ 8];
1086 #if VALIDATE_DOWNLOAD
1087 char verify_buffer
[GENERIC_LOAD_CHUNK
+ 8];
1090 /* enable user to specify address for downloading as 2nd arg to load */
1091 n
= sscanf (filename
, "%s 0x%lx", buf
, &load_offset
);
1097 loadfile_bfd
= bfd_openr (filename
, gnutarget
);
1098 if (loadfile_bfd
== NULL
)
1100 perror_with_name (filename
);
1103 /* FIXME: should be checking for errors from bfd_close (for one thing,
1104 on error it does not free all the storage associated with the
1106 old_cleanups
= make_cleanup ((make_cleanup_func
) bfd_close
, loadfile_bfd
);
1108 if (!bfd_check_format (loadfile_bfd
, bfd_object
))
1110 error ("\"%s\" is not an object file: %s", filename
,
1111 bfd_errmsg (bfd_get_error ()));
1114 start_time
= time (NULL
);
1116 for (s
= loadfile_bfd
->sections
; s
; s
= s
->next
)
1118 if (s
->flags
& SEC_LOAD
)
1122 size
= bfd_get_section_size_before_reloc (s
);
1126 struct cleanup
*old_chain
;
1128 unsigned long l
= size
;
1134 l
= l
> GENERIC_LOAD_CHUNK
? GENERIC_LOAD_CHUNK
: l
;
1136 buffer
= xmalloc (size
);
1137 old_chain
= make_cleanup (free
, buffer
);
1142 /* Is this really necessary? I guess it gives the user something
1143 to look at during a long download. */
1144 printf_filtered ("Loading section %s, size 0x%lx lma ",
1145 bfd_get_section_name (loadfile_bfd
, s
),
1146 (unsigned long) size
);
1147 print_address_numeric (lma
, 1, gdb_stdout
);
1148 printf_filtered ("\n");
1150 bfd_get_section_contents (loadfile_bfd
, s
, buffer
, 0, size
);
1152 sect
= (char *) bfd_get_section_name (loadfile_bfd
, s
);
1156 len
= (size
- sent
) < l
? (size
- sent
) : l
;
1158 err
= target_write_memory (lma
, buffer
, len
);
1159 if (ui_load_progress_hook
)
1160 if (ui_load_progress_hook (sect
, sent
))
1161 error ("Canceled the download");
1162 #if VALIDATE_DOWNLOAD
1163 /* Broken memories and broken monitors manifest themselves
1164 here when bring new computers to life.
1165 This doubles already slow downloads.
1170 target_read_memory (lma
, verify_buffer
, len
);
1171 if (0 != bcmp (buffer
, verify_buffer
, len
))
1172 error ("Download verify failed at %08x",
1173 (unsigned long) lma
);
1181 while (err
== 0 && sent
< size
);
1184 error ("Memory access error while loading section %s.",
1185 bfd_get_section_name (loadfile_bfd
, s
));
1187 do_cleanups (old_chain
);
1192 end_time
= time (NULL
);
1194 unsigned long entry
;
1195 entry
= bfd_get_start_address (loadfile_bfd
);
1196 printf_filtered ("Start address 0x%lx , load size %d\n", entry
, data_count
);
1197 /* We were doing this in remote-mips.c, I suspect it is right
1198 for other targets too. */
1202 /* FIXME: are we supposed to call symbol_file_add or not? According to
1203 a comment from remote-mips.c (where a call to symbol_file_add was
1204 commented out), making the call confuses GDB if more than one file is
1205 loaded in. remote-nindy.c had no call to symbol_file_add, but remote-vx.c
1208 report_transfer_performance (data_count
, start_time
, end_time
);
1210 do_cleanups (old_cleanups
);
1213 /* Report how fast the transfer went. */
1216 report_transfer_performance (data_count
, start_time
, end_time
)
1217 unsigned long data_count
;
1218 time_t start_time
, end_time
;
1220 printf_filtered ("Transfer rate: ");
1221 if (end_time
!= start_time
)
1222 printf_filtered ("%d bits/sec",
1223 (data_count
* 8) / (end_time
- start_time
));
1225 printf_filtered ("%d bits in <1 sec", (data_count
* 8));
1226 printf_filtered (".\n");
1229 /* This function allows the addition of incrementally linked object files.
1230 It does not modify any state in the target, only in the debugger. */
1234 add_symbol_file_command (args
, from_tty
)
1239 CORE_ADDR text_addr
;
1248 error ("add-symbol-file takes a file name and an address");
1251 /* Make a copy of the string that we can safely write into. */
1253 args
= strdup (args
);
1254 make_cleanup (free
, args
);
1256 /* Pick off any -option args and the file name. */
1258 while ((*args
!= '\000') && (name
== NULL
))
1260 while (isspace (*args
))
1265 while ((*args
!= '\000') && !isspace (*args
))
1269 if (*args
!= '\000')
1277 else if (STREQ (arg
, "-mapped"))
1281 else if (STREQ (arg
, "-readnow"))
1287 error ("unknown option `%s'", arg
);
1291 /* After picking off any options and the file name, args should be
1292 left pointing at the remainder of the command line, which should
1293 be the address expression to evaluate. */
1297 error ("add-symbol-file takes a file name");
1299 name
= tilde_expand (name
);
1300 make_cleanup (free
, name
);
1302 if (*args
!= '\000')
1304 text_addr
= parse_and_eval_address (args
);
1308 target_link (name
, &text_addr
);
1309 if (text_addr
== (CORE_ADDR
) -1)
1310 error ("Don't know how to get text start location for this file");
1313 /* FIXME-32x64: Assumes text_addr fits in a long. */
1315 && (!query ("add symbol table from file \"%s\" at text_addr = %s?\n",
1316 name
, local_hex_string ((unsigned long) text_addr
))))
1317 error ("Not confirmed.");
1319 symbol_file_add (name
, from_tty
, text_addr
, 0, mapped
, readnow
,
1320 1, /* user_loaded */
1321 0); /* We'll guess it's ! is_solib */
1323 /* Getting new symbols may change our opinion about what is
1325 reinit_frame_cache ();
1329 add_shared_symbol_files_command (args
, from_tty
)
1333 #ifdef ADD_SHARED_SYMBOL_FILES
1334 ADD_SHARED_SYMBOL_FILES (args
, from_tty
);
1336 error ("This command is not available in this configuration of GDB.");
1340 /* Re-read symbols if a symbol-file has changed. */
1344 struct objfile
*objfile
;
1347 struct stat new_statbuf
;
1350 /* With the addition of shared libraries, this should be modified,
1351 the load time should be saved in the partial symbol tables, since
1352 different tables may come from different source files. FIXME.
1353 This routine should then walk down each partial symbol table
1354 and see if the symbol table that it originates from has been changed */
1356 for (objfile
= object_files
; objfile
; objfile
= objfile
->next
)
1360 #ifdef IBM6000_TARGET
1361 /* If this object is from a shared library, then you should
1362 stat on the library name, not member name. */
1364 if (objfile
->obfd
->my_archive
)
1365 res
= stat (objfile
->obfd
->my_archive
->filename
, &new_statbuf
);
1368 res
= stat (objfile
->name
, &new_statbuf
);
1371 /* FIXME, should use print_sys_errmsg but it's not filtered. */
1372 printf_filtered ("`%s' has disappeared; keeping its symbols.\n",
1376 new_modtime
= new_statbuf
.st_mtime
;
1377 if (new_modtime
!= objfile
->mtime
)
1379 struct cleanup
*old_cleanups
;
1380 struct section_offsets
*offsets
;
1382 int section_offsets_size
;
1383 char *obfd_filename
;
1385 printf_filtered ("`%s' has changed; re-reading symbols.\n",
1388 /* There are various functions like symbol_file_add,
1389 symfile_bfd_open, syms_from_objfile, etc., which might
1390 appear to do what we want. But they have various other
1391 effects which we *don't* want. So we just do stuff
1392 ourselves. We don't worry about mapped files (for one thing,
1393 any mapped file will be out of date). */
1395 /* If we get an error, blow away this objfile (not sure if
1396 that is the correct response for things like shared
1398 old_cleanups
= make_cleanup ((make_cleanup_func
) free_objfile
,
1400 /* We need to do this whenever any symbols go away. */
1401 make_cleanup ((make_cleanup_func
) clear_symtab_users
, 0);
1403 /* Clean up any state BFD has sitting around. We don't need
1404 to close the descriptor but BFD lacks a way of closing the
1405 BFD without closing the descriptor. */
1406 obfd_filename
= bfd_get_filename (objfile
->obfd
);
1407 if (!bfd_close (objfile
->obfd
))
1408 error ("Can't close BFD for %s: %s", objfile
->name
,
1409 bfd_errmsg (bfd_get_error ()));
1410 objfile
->obfd
= bfd_openr (obfd_filename
, gnutarget
);
1411 if (objfile
->obfd
== NULL
)
1412 error ("Can't open %s to read symbols.", objfile
->name
);
1413 /* bfd_openr sets cacheable to true, which is what we want. */
1414 if (!bfd_check_format (objfile
->obfd
, bfd_object
))
1415 error ("Can't read symbols from %s: %s.", objfile
->name
,
1416 bfd_errmsg (bfd_get_error ()));
1418 /* Save the offsets, we will nuke them with the rest of the
1420 num_offsets
= objfile
->num_sections
;
1421 section_offsets_size
=
1422 sizeof (struct section_offsets
)
1423 + sizeof (objfile
->section_offsets
->offsets
) * num_offsets
;
1424 offsets
= (struct section_offsets
*) alloca (section_offsets_size
);
1425 memcpy (offsets
, objfile
->section_offsets
, section_offsets_size
);
1427 /* Nuke all the state that we will re-read. Much of the following
1428 code which sets things to NULL really is necessary to tell
1429 other parts of GDB that there is nothing currently there. */
1431 /* FIXME: Do we have to free a whole linked list, or is this
1433 if (objfile
->global_psymbols
.list
)
1434 mfree (objfile
->md
, objfile
->global_psymbols
.list
);
1435 memset (&objfile
->global_psymbols
, 0,
1436 sizeof (objfile
->global_psymbols
));
1437 if (objfile
->static_psymbols
.list
)
1438 mfree (objfile
->md
, objfile
->static_psymbols
.list
);
1439 memset (&objfile
->static_psymbols
, 0,
1440 sizeof (objfile
->static_psymbols
));
1442 /* Free the obstacks for non-reusable objfiles */
1443 obstack_free (&objfile
->psymbol_cache
.cache
, 0);
1444 memset (&objfile
->psymbol_cache
, 0,
1445 sizeof (objfile
->psymbol_cache
));
1446 obstack_free (&objfile
->psymbol_obstack
, 0);
1447 obstack_free (&objfile
->symbol_obstack
, 0);
1448 obstack_free (&objfile
->type_obstack
, 0);
1449 objfile
->sections
= NULL
;
1450 objfile
->symtabs
= NULL
;
1451 objfile
->psymtabs
= NULL
;
1452 objfile
->free_psymtabs
= NULL
;
1453 objfile
->msymbols
= NULL
;
1454 objfile
->minimal_symbol_count
= 0;
1455 objfile
->fundamental_types
= NULL
;
1456 if (objfile
->sf
!= NULL
)
1458 (*objfile
->sf
->sym_finish
) (objfile
);
1461 /* We never make this a mapped file. */
1463 /* obstack_specify_allocation also initializes the obstack so
1465 obstack_specify_allocation (&objfile
->psymbol_cache
.cache
, 0, 0,
1467 obstack_specify_allocation (&objfile
->psymbol_obstack
, 0, 0,
1469 obstack_specify_allocation (&objfile
->symbol_obstack
, 0, 0,
1471 obstack_specify_allocation (&objfile
->type_obstack
, 0, 0,
1473 if (build_objfile_section_table (objfile
))
1475 error ("Can't find the file sections in `%s': %s",
1476 objfile
->name
, bfd_errmsg (bfd_get_error ()));
1479 /* We use the same section offsets as from last time. I'm not
1480 sure whether that is always correct for shared libraries. */
1481 objfile
->section_offsets
= (struct section_offsets
*)
1482 obstack_alloc (&objfile
->psymbol_obstack
, section_offsets_size
);
1483 memcpy (objfile
->section_offsets
, offsets
, section_offsets_size
);
1484 objfile
->num_sections
= num_offsets
;
1486 /* What the hell is sym_new_init for, anyway? The concept of
1487 distinguishing between the main file and additional files
1488 in this way seems rather dubious. */
1489 if (objfile
== symfile_objfile
)
1491 (*objfile
->sf
->sym_new_init
) (objfile
);
1493 RESET_HP_UX_GLOBALS ();
1497 (*objfile
->sf
->sym_init
) (objfile
);
1498 clear_complaints (1, 1);
1499 /* The "mainline" parameter is a hideous hack; I think leaving it
1500 zero is OK since dbxread.c also does what it needs to do if
1501 objfile->global_psymbols.size is 0. */
1502 (*objfile
->sf
->sym_read
) (objfile
, 0);
1503 if (!have_partial_symbols () && !have_full_symbols ())
1506 printf_filtered ("(no debugging symbols found)\n");
1509 objfile
->flags
|= OBJF_SYMS
;
1511 /* We're done reading the symbol file; finish off complaints. */
1512 clear_complaints (0, 1);
1514 /* Getting new symbols may change our opinion about what is
1517 reinit_frame_cache ();
1519 /* Discard cleanups as symbol reading was successful. */
1520 discard_cleanups (old_cleanups
);
1522 /* If the mtime has changed between the time we set new_modtime
1523 and now, we *want* this to be out of date, so don't call stat
1525 objfile
->mtime
= new_modtime
;
1528 /* Call this after reading in a new symbol table to give target
1529 dependant code a crack at the new symbols. For instance, this
1530 could be used to update the values of target-specific symbols GDB
1531 needs to keep track of (such as _sigtramp, or whatever). */
1533 TARGET_SYMFILE_POSTREAD (objfile
);
1539 clear_symtab_users ();
1551 static filename_language
*filename_language_table
;
1552 static int fl_table_size
, fl_table_next
;
1555 add_filename_language (ext
, lang
)
1559 if (fl_table_next
>= fl_table_size
)
1561 fl_table_size
+= 10;
1562 filename_language_table
= realloc (filename_language_table
,
1566 filename_language_table
[fl_table_next
].ext
= strsave (ext
);
1567 filename_language_table
[fl_table_next
].lang
= lang
;
1571 static char *ext_args
;
1574 set_ext_lang_command (args
, from_tty
)
1579 char *cp
= ext_args
;
1582 /* First arg is filename extension, starting with '.' */
1584 error ("'%s': Filename extension must begin with '.'", ext_args
);
1586 /* Find end of first arg. */
1587 while (*cp
&& !isspace (*cp
))
1591 error ("'%s': two arguments required -- filename extension and language",
1594 /* Null-terminate first arg */
1597 /* Find beginning of second arg, which should be a source language. */
1598 while (*cp
&& isspace (*cp
))
1602 error ("'%s': two arguments required -- filename extension and language",
1605 /* Lookup the language from among those we know. */
1606 lang
= language_enum (cp
);
1608 /* Now lookup the filename extension: do we already know it? */
1609 for (i
= 0; i
< fl_table_next
; i
++)
1610 if (0 == strcmp (ext_args
, filename_language_table
[i
].ext
))
1613 if (i
>= fl_table_next
)
1615 /* new file extension */
1616 add_filename_language (ext_args
, lang
);
1620 /* redefining a previously known filename extension */
1623 /* query ("Really make files of type %s '%s'?", */
1624 /* ext_args, language_str (lang)); */
1626 free (filename_language_table
[i
].ext
);
1627 filename_language_table
[i
].ext
= strsave (ext_args
);
1628 filename_language_table
[i
].lang
= lang
;
1633 info_ext_lang_command (args
, from_tty
)
1639 printf_filtered ("Filename extensions and the languages they represent:");
1640 printf_filtered ("\n\n");
1641 for (i
= 0; i
< fl_table_next
; i
++)
1642 printf_filtered ("\t%s\t- %s\n",
1643 filename_language_table
[i
].ext
,
1644 language_str (filename_language_table
[i
].lang
));
1648 init_filename_language_table ()
1650 if (fl_table_size
== 0) /* protect against repetition */
1654 filename_language_table
=
1655 xmalloc (fl_table_size
* sizeof (*filename_language_table
));
1656 add_filename_language (".c", language_c
);
1657 add_filename_language (".C", language_cplus
);
1658 add_filename_language (".cc", language_cplus
);
1659 add_filename_language (".cp", language_cplus
);
1660 add_filename_language (".cpp", language_cplus
);
1661 add_filename_language (".cxx", language_cplus
);
1662 add_filename_language (".c++", language_cplus
);
1663 add_filename_language (".java", language_java
);
1664 add_filename_language (".class", language_java
);
1665 add_filename_language (".ch", language_chill
);
1666 add_filename_language (".c186", language_chill
);
1667 add_filename_language (".c286", language_chill
);
1668 add_filename_language (".f", language_fortran
);
1669 add_filename_language (".F", language_fortran
);
1670 add_filename_language (".s", language_asm
);
1671 add_filename_language (".S", language_asm
);
1676 deduce_language_from_filename (filename
)
1682 if (filename
!= NULL
)
1683 if ((cp
= strrchr (filename
, '.')) != NULL
)
1684 for (i
= 0; i
< fl_table_next
; i
++)
1685 if (strcmp (cp
, filename_language_table
[i
].ext
) == 0)
1686 return filename_language_table
[i
].lang
;
1688 return language_unknown
;
1693 Allocate and partly initialize a new symbol table. Return a pointer
1694 to it. error() if no space.
1696 Caller must set these fields:
1702 possibly free_named_symtabs (symtab->filename);
1706 allocate_symtab (filename
, objfile
)
1708 struct objfile
*objfile
;
1710 register struct symtab
*symtab
;
1712 symtab
= (struct symtab
*)
1713 obstack_alloc (&objfile
->symbol_obstack
, sizeof (struct symtab
));
1714 memset (symtab
, 0, sizeof (*symtab
));
1715 symtab
->filename
= obsavestring (filename
, strlen (filename
),
1716 &objfile
->symbol_obstack
);
1717 symtab
->fullname
= NULL
;
1718 symtab
->language
= deduce_language_from_filename (filename
);
1719 symtab
->debugformat
= obsavestring ("unknown", 7,
1720 &objfile
->symbol_obstack
);
1722 /* Hook it to the objfile it comes from */
1724 symtab
->objfile
= objfile
;
1725 symtab
->next
= objfile
->symtabs
;
1726 objfile
->symtabs
= symtab
;
1728 /* FIXME: This should go away. It is only defined for the Z8000,
1729 and the Z8000 definition of this macro doesn't have anything to
1730 do with the now-nonexistent EXTRA_SYMTAB_INFO macro, it's just
1731 here for convenience. */
1732 #ifdef INIT_EXTRA_SYMTAB_INFO
1733 INIT_EXTRA_SYMTAB_INFO (symtab
);
1739 struct partial_symtab
*
1740 allocate_psymtab (filename
, objfile
)
1742 struct objfile
*objfile
;
1744 struct partial_symtab
*psymtab
;
1746 if (objfile
->free_psymtabs
)
1748 psymtab
= objfile
->free_psymtabs
;
1749 objfile
->free_psymtabs
= psymtab
->next
;
1752 psymtab
= (struct partial_symtab
*)
1753 obstack_alloc (&objfile
->psymbol_obstack
,
1754 sizeof (struct partial_symtab
));
1756 memset (psymtab
, 0, sizeof (struct partial_symtab
));
1757 psymtab
->filename
= obsavestring (filename
, strlen (filename
),
1758 &objfile
->psymbol_obstack
);
1759 psymtab
->symtab
= NULL
;
1761 /* Prepend it to the psymtab list for the objfile it belongs to.
1762 Psymtabs are searched in most recent inserted -> least recent
1765 psymtab
->objfile
= objfile
;
1766 psymtab
->next
= objfile
->psymtabs
;
1767 objfile
->psymtabs
= psymtab
;
1770 struct partial_symtab
**prev_pst
;
1771 psymtab
->objfile
= objfile
;
1772 psymtab
->next
= NULL
;
1773 prev_pst
= &(objfile
->psymtabs
);
1774 while ((*prev_pst
) != NULL
)
1775 prev_pst
= &((*prev_pst
)->next
);
1776 (*prev_pst
) = psymtab
;
1784 discard_psymtab (pst
)
1785 struct partial_symtab
*pst
;
1787 struct partial_symtab
**prev_pst
;
1790 Empty psymtabs happen as a result of header files which don't
1791 have any symbols in them. There can be a lot of them. But this
1792 check is wrong, in that a psymtab with N_SLINE entries but
1793 nothing else is not empty, but we don't realize that. Fixing
1794 that without slowing things down might be tricky. */
1796 /* First, snip it out of the psymtab chain */
1798 prev_pst
= &(pst
->objfile
->psymtabs
);
1799 while ((*prev_pst
) != pst
)
1800 prev_pst
= &((*prev_pst
)->next
);
1801 (*prev_pst
) = pst
->next
;
1803 /* Next, put it on a free list for recycling */
1805 pst
->next
= pst
->objfile
->free_psymtabs
;
1806 pst
->objfile
->free_psymtabs
= pst
;
1810 /* Reset all data structures in gdb which may contain references to symbol
1814 clear_symtab_users ()
1816 /* Someday, we should do better than this, by only blowing away
1817 the things that really need to be blown. */
1818 clear_value_history ();
1820 clear_internalvars ();
1821 breakpoint_re_set ();
1822 set_default_breakpoint (0, 0, 0, 0);
1823 current_source_symtab
= 0;
1824 current_source_line
= 0;
1825 clear_pc_function_cache ();
1826 target_new_objfile (NULL
);
1829 /* clear_symtab_users_once:
1831 This function is run after symbol reading, or from a cleanup.
1832 If an old symbol table was obsoleted, the old symbol table
1833 has been blown away, but the other GDB data structures that may
1834 reference it have not yet been cleared or re-directed. (The old
1835 symtab was zapped, and the cleanup queued, in free_named_symtab()
1838 This function can be queued N times as a cleanup, or called
1839 directly; it will do all the work the first time, and then will be a
1840 no-op until the next time it is queued. This works by bumping a
1841 counter at queueing time. Much later when the cleanup is run, or at
1842 the end of symbol processing (in case the cleanup is discarded), if
1843 the queued count is greater than the "done-count", we do the work
1844 and set the done-count to the queued count. If the queued count is
1845 less than or equal to the done-count, we just ignore the call. This
1846 is needed because reading a single .o file will often replace many
1847 symtabs (one per .h file, for example), and we don't want to reset
1848 the breakpoints N times in the user's face.
1850 The reason we both queue a cleanup, and call it directly after symbol
1851 reading, is because the cleanup protects us in case of errors, but is
1852 discarded if symbol reading is successful. */
1855 /* FIXME: As free_named_symtabs is currently a big noop this function
1856 is no longer needed. */
1858 clear_symtab_users_once
PARAMS ((void));
1860 static int clear_symtab_users_queued
;
1861 static int clear_symtab_users_done
;
1864 clear_symtab_users_once ()
1866 /* Enforce once-per-`do_cleanups'-semantics */
1867 if (clear_symtab_users_queued
<= clear_symtab_users_done
)
1869 clear_symtab_users_done
= clear_symtab_users_queued
;
1871 clear_symtab_users ();
1875 /* Delete the specified psymtab, and any others that reference it. */
1878 cashier_psymtab (pst
)
1879 struct partial_symtab
*pst
;
1881 struct partial_symtab
*ps
, *pprev
= NULL
;
1884 /* Find its previous psymtab in the chain */
1885 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
)
1894 /* Unhook it from the chain. */
1895 if (ps
== pst
->objfile
->psymtabs
)
1896 pst
->objfile
->psymtabs
= ps
->next
;
1898 pprev
->next
= ps
->next
;
1900 /* FIXME, we can't conveniently deallocate the entries in the
1901 partial_symbol lists (global_psymbols/static_psymbols) that
1902 this psymtab points to. These just take up space until all
1903 the psymtabs are reclaimed. Ditto the dependencies list and
1904 filename, which are all in the psymbol_obstack. */
1906 /* We need to cashier any psymtab that has this one as a dependency... */
1908 for (ps
= pst
->objfile
->psymtabs
; ps
; ps
= ps
->next
)
1910 for (i
= 0; i
< ps
->number_of_dependencies
; i
++)
1912 if (ps
->dependencies
[i
] == pst
)
1914 cashier_psymtab (ps
);
1915 goto again
; /* Must restart, chain has been munged. */
1922 /* If a symtab or psymtab for filename NAME is found, free it along
1923 with any dependent breakpoints, displays, etc.
1924 Used when loading new versions of object modules with the "add-file"
1925 command. This is only called on the top-level symtab or psymtab's name;
1926 it is not called for subsidiary files such as .h files.
1928 Return value is 1 if we blew away the environment, 0 if not.
1929 FIXME. The return valu appears to never be used.
1931 FIXME. I think this is not the best way to do this. We should
1932 work on being gentler to the environment while still cleaning up
1933 all stray pointers into the freed symtab. */
1936 free_named_symtabs (name
)
1940 /* FIXME: With the new method of each objfile having it's own
1941 psymtab list, this function needs serious rethinking. In particular,
1942 why was it ever necessary to toss psymtabs with specific compilation
1943 unit filenames, as opposed to all psymtabs from a particular symbol
1945 Well, the answer is that some systems permit reloading of particular
1946 compilation units. We want to blow away any old info about these
1947 compilation units, regardless of which objfiles they arrived in. --gnu. */
1949 register struct symtab
*s
;
1950 register struct symtab
*prev
;
1951 register struct partial_symtab
*ps
;
1952 struct blockvector
*bv
;
1955 /* We only wack things if the symbol-reload switch is set. */
1956 if (!symbol_reloading
)
1959 /* Some symbol formats have trouble providing file names... */
1960 if (name
== 0 || *name
== '\0')
1963 /* Look for a psymtab with the specified name. */
1966 for (ps
= partial_symtab_list
; ps
; ps
= ps
->next
)
1968 if (STREQ (name
, ps
->filename
))
1970 cashier_psymtab (ps
); /* Blow it away...and its little dog, too. */
1971 goto again2
; /* Must restart, chain has been munged */
1975 /* Look for a symtab with the specified name. */
1977 for (s
= symtab_list
; s
; s
= s
->next
)
1979 if (STREQ (name
, s
->filename
))
1986 if (s
== symtab_list
)
1987 symtab_list
= s
->next
;
1989 prev
->next
= s
->next
;
1991 /* For now, queue a delete for all breakpoints, displays, etc., whether
1992 or not they depend on the symtab being freed. This should be
1993 changed so that only those data structures affected are deleted. */
1995 /* But don't delete anything if the symtab is empty.
1996 This test is necessary due to a bug in "dbxread.c" that
1997 causes empty symtabs to be created for N_SO symbols that
1998 contain the pathname of the object file. (This problem
1999 has been fixed in GDB 3.9x). */
2001 bv
= BLOCKVECTOR (s
);
2002 if (BLOCKVECTOR_NBLOCKS (bv
) > 2
2003 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, GLOBAL_BLOCK
))
2004 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv
, STATIC_BLOCK
)))
2006 complain (&oldsyms_complaint
, name
);
2008 clear_symtab_users_queued
++;
2009 make_cleanup (clear_symtab_users_once
, 0);
2014 complain (&empty_symtab_complaint
, name
);
2021 /* It is still possible that some breakpoints will be affected
2022 even though no symtab was found, since the file might have
2023 been compiled without debugging, and hence not be associated
2024 with a symtab. In order to handle this correctly, we would need
2025 to keep a list of text address ranges for undebuggable files.
2026 For now, we do nothing, since this is a fairly obscure case. */
2030 /* FIXME, what about the minimal symbol table? */
2037 /* Allocate and partially fill a partial symtab. It will be
2038 completely filled at the end of the symbol list.
2040 SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR
2041 is the address relative to which its symbols are (incremental) or 0
2045 struct partial_symtab
*
2046 start_psymtab_common (objfile
, section_offsets
,
2047 filename
, textlow
, global_syms
, static_syms
)
2048 struct objfile
*objfile
;
2049 struct section_offsets
*section_offsets
;
2052 struct partial_symbol
**global_syms
;
2053 struct partial_symbol
**static_syms
;
2055 struct partial_symtab
*psymtab
;
2057 psymtab
= allocate_psymtab (filename
, objfile
);
2058 psymtab
->section_offsets
= section_offsets
;
2059 psymtab
->textlow
= textlow
;
2060 psymtab
->texthigh
= psymtab
->textlow
; /* default */
2061 psymtab
->globals_offset
= global_syms
- objfile
->global_psymbols
.list
;
2062 psymtab
->statics_offset
= static_syms
- objfile
->static_psymbols
.list
;
2066 /* Add a symbol with a long value to a psymtab.
2067 Since one arg is a struct, we pass in a ptr and deref it (sigh). */
2070 add_psymbol_to_list (name
, namelength
, namespace, class, list
, val
, coreaddr
,
2074 namespace_enum
namespace;
2075 enum address_class
class;
2076 struct psymbol_allocation_list
*list
;
2077 long val
; /* Value as a long */
2078 CORE_ADDR coreaddr
; /* Value as a CORE_ADDR */
2079 enum language language
;
2080 struct objfile
*objfile
;
2082 register struct partial_symbol
*psym
;
2083 char *buf
= alloca (namelength
+ 1);
2084 /* psymbol is static so that there will be no uninitialized gaps in the
2085 structure which might contain random data, causing cache misses in
2087 static struct partial_symbol psymbol
;
2089 /* Create local copy of the partial symbol */
2090 memcpy (buf
, name
, namelength
);
2091 buf
[namelength
] = '\0';
2092 SYMBOL_NAME (&psymbol
) = bcache (buf
, namelength
+ 1, &objfile
->psymbol_cache
);
2093 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2096 SYMBOL_VALUE (&psymbol
) = val
;
2100 SYMBOL_VALUE_ADDRESS (&psymbol
) = coreaddr
;
2102 SYMBOL_SECTION (&psymbol
) = 0;
2103 SYMBOL_LANGUAGE (&psymbol
) = language
;
2104 PSYMBOL_NAMESPACE (&psymbol
) = namespace;
2105 PSYMBOL_CLASS (&psymbol
) = class;
2106 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol
, language
);
2108 /* Stash the partial symbol away in the cache */
2109 psym
= bcache (&psymbol
, sizeof (struct partial_symbol
), &objfile
->psymbol_cache
);
2111 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2112 if (list
->next
>= list
->list
+ list
->size
)
2114 extend_psymbol_list (list
, objfile
);
2116 *list
->next
++ = psym
;
2117 OBJSTAT (objfile
, n_psyms
++);
2120 /* Add a symbol with a long value to a psymtab. This differs from
2121 * add_psymbol_to_list above in taking both a mangled and a demangled
2125 add_psymbol_with_dem_name_to_list (name
, namelength
, dem_name
, dem_namelength
,
2126 namespace, class, list
, val
, coreaddr
, language
, objfile
)
2131 namespace_enum
namespace;
2132 enum address_class
class;
2133 struct psymbol_allocation_list
*list
;
2134 long val
; /* Value as a long */
2135 CORE_ADDR coreaddr
; /* Value as a CORE_ADDR */
2136 enum language language
;
2137 struct objfile
*objfile
;
2139 register struct partial_symbol
*psym
;
2140 char *buf
= alloca (namelength
+ 1);
2141 /* psymbol is static so that there will be no uninitialized gaps in the
2142 structure which might contain random data, causing cache misses in
2144 static struct partial_symbol psymbol
;
2146 /* Create local copy of the partial symbol */
2148 memcpy (buf
, name
, namelength
);
2149 buf
[namelength
] = '\0';
2150 SYMBOL_NAME (&psymbol
) = bcache (buf
, namelength
+ 1, &objfile
->psymbol_cache
);
2152 buf
= alloca (dem_namelength
+ 1);
2153 memcpy (buf
, dem_name
, dem_namelength
);
2154 buf
[dem_namelength
] = '\0';
2159 case language_cplus
:
2160 SYMBOL_CPLUS_DEMANGLED_NAME (&psymbol
) =
2161 bcache (buf
, dem_namelength
+ 1, &objfile
->psymbol_cache
);
2163 case language_chill
:
2164 SYMBOL_CHILL_DEMANGLED_NAME (&psymbol
) =
2165 bcache (buf
, dem_namelength
+ 1, &objfile
->psymbol_cache
);
2167 /* FIXME What should be done for the default case? Ignoring for now. */
2170 /* val and coreaddr are mutually exclusive, one of them *will* be zero */
2173 SYMBOL_VALUE (&psymbol
) = val
;
2177 SYMBOL_VALUE_ADDRESS (&psymbol
) = coreaddr
;
2179 SYMBOL_SECTION (&psymbol
) = 0;
2180 SYMBOL_LANGUAGE (&psymbol
) = language
;
2181 PSYMBOL_NAMESPACE (&psymbol
) = namespace;
2182 PSYMBOL_CLASS (&psymbol
) = class;
2183 SYMBOL_INIT_LANGUAGE_SPECIFIC (&psymbol
, language
);
2185 /* Stash the partial symbol away in the cache */
2186 psym
= bcache (&psymbol
, sizeof (struct partial_symbol
), &objfile
->psymbol_cache
);
2188 /* Save pointer to partial symbol in psymtab, growing symtab if needed. */
2189 if (list
->next
>= list
->list
+ list
->size
)
2191 extend_psymbol_list (list
, objfile
);
2193 *list
->next
++ = psym
;
2194 OBJSTAT (objfile
, n_psyms
++);
2197 /* Initialize storage for partial symbols. */
2200 init_psymbol_list (objfile
, total_symbols
)
2201 struct objfile
*objfile
;
2204 /* Free any previously allocated psymbol lists. */
2206 if (objfile
->global_psymbols
.list
)
2208 mfree (objfile
->md
, (PTR
) objfile
->global_psymbols
.list
);
2210 if (objfile
->static_psymbols
.list
)
2212 mfree (objfile
->md
, (PTR
) objfile
->static_psymbols
.list
);
2215 /* Current best guess is that approximately a twentieth
2216 of the total symbols (in a debugging file) are global or static
2219 objfile
->global_psymbols
.size
= total_symbols
/ 10;
2220 objfile
->static_psymbols
.size
= total_symbols
/ 10;
2222 if (objfile
->global_psymbols
.size
> 0)
2224 objfile
->global_psymbols
.next
=
2225 objfile
->global_psymbols
.list
= (struct partial_symbol
**)
2226 xmmalloc (objfile
->md
, (objfile
->global_psymbols
.size
2227 * sizeof (struct partial_symbol
*)));
2229 if (objfile
->static_psymbols
.size
> 0)
2231 objfile
->static_psymbols
.next
=
2232 objfile
->static_psymbols
.list
= (struct partial_symbol
**)
2233 xmmalloc (objfile
->md
, (objfile
->static_psymbols
.size
2234 * sizeof (struct partial_symbol
*)));
2239 The following code implements an abstraction for debugging overlay sections.
2241 The target model is as follows:
2242 1) The gnu linker will permit multiple sections to be mapped into the
2243 same VMA, each with its own unique LMA (or load address).
2244 2) It is assumed that some runtime mechanism exists for mapping the
2245 sections, one by one, from the load address into the VMA address.
2246 3) This code provides a mechanism for gdb to keep track of which
2247 sections should be considered to be mapped from the VMA to the LMA.
2248 This information is used for symbol lookup, and memory read/write.
2249 For instance, if a section has been mapped then its contents
2250 should be read from the VMA, otherwise from the LMA.
2252 Two levels of debugger support for overlays are available. One is
2253 "manual", in which the debugger relies on the user to tell it which
2254 overlays are currently mapped. This level of support is
2255 implemented entirely in the core debugger, and the information about
2256 whether a section is mapped is kept in the objfile->obj_section table.
2258 The second level of support is "automatic", and is only available if
2259 the target-specific code provides functionality to read the target's
2260 overlay mapping table, and translate its contents for the debugger
2261 (by updating the mapped state information in the obj_section tables).
2263 The interface is as follows:
2265 overlay map <name> -- tell gdb to consider this section mapped
2266 overlay unmap <name> -- tell gdb to consider this section unmapped
2267 overlay list -- list the sections that GDB thinks are mapped
2268 overlay read-target -- get the target's state of what's mapped
2269 overlay off/manual/auto -- set overlay debugging state
2270 Functional interface:
2271 find_pc_mapped_section(pc): if the pc is in the range of a mapped
2272 section, return that section.
2273 find_pc_overlay(pc): find any overlay section that contains
2274 the pc, either in its VMA or its LMA
2275 overlay_is_mapped(sect): true if overlay is marked as mapped
2276 section_is_overlay(sect): true if section's VMA != LMA
2277 pc_in_mapped_range(pc,sec): true if pc belongs to section's VMA
2278 pc_in_unmapped_range(...): true if pc belongs to section's LMA
2279 overlay_mapped_address(...): map an address from section's LMA to VMA
2280 overlay_unmapped_address(...): map an address from section's VMA to LMA
2281 symbol_overlayed_address(...): Return a "current" address for symbol:
2282 either in VMA or LMA depending on whether
2283 the symbol's section is currently mapped
2286 /* Overlay debugging state: */
2288 int overlay_debugging
= 0; /* 0 == off, 1 == manual, -1 == auto */
2289 int overlay_cache_invalid
= 0; /* True if need to refresh mapped state */
2291 /* Target vector for refreshing overlay mapped state */
2292 static void simple_overlay_update
PARAMS ((struct obj_section
*));
2293 void (*target_overlay_update
) PARAMS ((struct obj_section
*))
2294 = simple_overlay_update
;
2296 /* Function: section_is_overlay (SECTION)
2297 Returns true if SECTION has VMA not equal to LMA, ie.
2298 SECTION is loaded at an address different from where it will "run". */
2301 section_is_overlay (section
)
2304 if (overlay_debugging
)
2305 if (section
&& section
->lma
!= 0 &&
2306 section
->vma
!= section
->lma
)
2312 /* Function: overlay_invalidate_all (void)
2313 Invalidate the mapped state of all overlay sections (mark it as stale). */
2316 overlay_invalidate_all ()
2318 struct objfile
*objfile
;
2319 struct obj_section
*sect
;
2321 ALL_OBJSECTIONS (objfile
, sect
)
2322 if (section_is_overlay (sect
->the_bfd_section
))
2323 sect
->ovly_mapped
= -1;
2326 /* Function: overlay_is_mapped (SECTION)
2327 Returns true if section is an overlay, and is currently mapped.
2328 Private: public access is thru function section_is_mapped.
2330 Access to the ovly_mapped flag is restricted to this function, so
2331 that we can do automatic update. If the global flag
2332 OVERLAY_CACHE_INVALID is set (by wait_for_inferior), then call
2333 overlay_invalidate_all. If the mapped state of the particular
2334 section is stale, then call TARGET_OVERLAY_UPDATE to refresh it. */
2337 overlay_is_mapped (osect
)
2338 struct obj_section
*osect
;
2340 if (osect
== 0 || !section_is_overlay (osect
->the_bfd_section
))
2343 switch (overlay_debugging
)
2347 return 0; /* overlay debugging off */
2348 case -1: /* overlay debugging automatic */
2349 /* Unles there is a target_overlay_update function,
2350 there's really nothing useful to do here (can't really go auto) */
2351 if (target_overlay_update
)
2353 if (overlay_cache_invalid
)
2355 overlay_invalidate_all ();
2356 overlay_cache_invalid
= 0;
2358 if (osect
->ovly_mapped
== -1)
2359 (*target_overlay_update
) (osect
);
2361 /* fall thru to manual case */
2362 case 1: /* overlay debugging manual */
2363 return osect
->ovly_mapped
== 1;
2367 /* Function: section_is_mapped
2368 Returns true if section is an overlay, and is currently mapped. */
2371 section_is_mapped (section
)
2374 struct objfile
*objfile
;
2375 struct obj_section
*osect
;
2377 if (overlay_debugging
)
2378 if (section
&& section_is_overlay (section
))
2379 ALL_OBJSECTIONS (objfile
, osect
)
2380 if (osect
->the_bfd_section
== section
)
2381 return overlay_is_mapped (osect
);
2386 /* Function: pc_in_unmapped_range
2387 If PC falls into the lma range of SECTION, return true, else false. */
2390 pc_in_unmapped_range (pc
, section
)
2396 if (overlay_debugging
)
2397 if (section
&& section_is_overlay (section
))
2399 size
= bfd_get_section_size_before_reloc (section
);
2400 if (section
->lma
<= pc
&& pc
< section
->lma
+ size
)
2406 /* Function: pc_in_mapped_range
2407 If PC falls into the vma range of SECTION, return true, else false. */
2410 pc_in_mapped_range (pc
, section
)
2416 if (overlay_debugging
)
2417 if (section
&& section_is_overlay (section
))
2419 size
= bfd_get_section_size_before_reloc (section
);
2420 if (section
->vma
<= pc
&& pc
< section
->vma
+ size
)
2426 /* Function: overlay_unmapped_address (PC, SECTION)
2427 Returns the address corresponding to PC in the unmapped (load) range.
2428 May be the same as PC. */
2431 overlay_unmapped_address (pc
, section
)
2435 if (overlay_debugging
)
2436 if (section
&& section_is_overlay (section
) &&
2437 pc_in_mapped_range (pc
, section
))
2438 return pc
+ section
->lma
- section
->vma
;
2443 /* Function: overlay_mapped_address (PC, SECTION)
2444 Returns the address corresponding to PC in the mapped (runtime) range.
2445 May be the same as PC. */
2448 overlay_mapped_address (pc
, section
)
2452 if (overlay_debugging
)
2453 if (section
&& section_is_overlay (section
) &&
2454 pc_in_unmapped_range (pc
, section
))
2455 return pc
+ section
->vma
- section
->lma
;
2461 /* Function: symbol_overlayed_address
2462 Return one of two addresses (relative to the VMA or to the LMA),
2463 depending on whether the section is mapped or not. */
2466 symbol_overlayed_address (address
, section
)
2470 if (overlay_debugging
)
2472 /* If the symbol has no section, just return its regular address. */
2475 /* If the symbol's section is not an overlay, just return its address */
2476 if (!section_is_overlay (section
))
2478 /* If the symbol's section is mapped, just return its address */
2479 if (section_is_mapped (section
))
2482 * HOWEVER: if the symbol is in an overlay section which is NOT mapped,
2483 * then return its LOADED address rather than its vma address!!
2485 return overlay_unmapped_address (address
, section
);
2490 /* Function: find_pc_overlay (PC)
2491 Return the best-match overlay section for PC:
2492 If PC matches a mapped overlay section's VMA, return that section.
2493 Else if PC matches an unmapped section's VMA, return that section.
2494 Else if PC matches an unmapped section's LMA, return that section. */
2497 find_pc_overlay (pc
)
2500 struct objfile
*objfile
;
2501 struct obj_section
*osect
, *best_match
= NULL
;
2503 if (overlay_debugging
)
2504 ALL_OBJSECTIONS (objfile
, osect
)
2505 if (section_is_overlay (osect
->the_bfd_section
))
2507 if (pc_in_mapped_range (pc
, osect
->the_bfd_section
))
2509 if (overlay_is_mapped (osect
))
2510 return osect
->the_bfd_section
;
2514 else if (pc_in_unmapped_range (pc
, osect
->the_bfd_section
))
2517 return best_match
? best_match
->the_bfd_section
: NULL
;
2520 /* Function: find_pc_mapped_section (PC)
2521 If PC falls into the VMA address range of an overlay section that is
2522 currently marked as MAPPED, return that section. Else return NULL. */
2525 find_pc_mapped_section (pc
)
2528 struct objfile
*objfile
;
2529 struct obj_section
*osect
;
2531 if (overlay_debugging
)
2532 ALL_OBJSECTIONS (objfile
, osect
)
2533 if (pc_in_mapped_range (pc
, osect
->the_bfd_section
) &&
2534 overlay_is_mapped (osect
))
2535 return osect
->the_bfd_section
;
2540 /* Function: list_overlays_command
2541 Print a list of mapped sections and their PC ranges */
2544 list_overlays_command (args
, from_tty
)
2549 struct objfile
*objfile
;
2550 struct obj_section
*osect
;
2552 if (overlay_debugging
)
2553 ALL_OBJSECTIONS (objfile
, osect
)
2554 if (overlay_is_mapped (osect
))
2560 vma
= bfd_section_vma (objfile
->obfd
, osect
->the_bfd_section
);
2561 lma
= bfd_section_lma (objfile
->obfd
, osect
->the_bfd_section
);
2562 size
= bfd_get_section_size_before_reloc (osect
->the_bfd_section
);
2563 name
= bfd_section_name (objfile
->obfd
, osect
->the_bfd_section
);
2565 printf_filtered ("Section %s, loaded at ", name
);
2566 print_address_numeric (lma
, 1, gdb_stdout
);
2567 puts_filtered (" - ");
2568 print_address_numeric (lma
+ size
, 1, gdb_stdout
);
2569 printf_filtered (", mapped at ");
2570 print_address_numeric (vma
, 1, gdb_stdout
);
2571 puts_filtered (" - ");
2572 print_address_numeric (vma
+ size
, 1, gdb_stdout
);
2573 puts_filtered ("\n");
2578 printf_filtered ("No sections are mapped.\n");
2581 /* Function: map_overlay_command
2582 Mark the named section as mapped (ie. residing at its VMA address). */
2585 map_overlay_command (args
, from_tty
)
2589 struct objfile
*objfile
, *objfile2
;
2590 struct obj_section
*sec
, *sec2
;
2593 if (!overlay_debugging
)
2594 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2596 if (args
== 0 || *args
== 0)
2597 error ("Argument required: name of an overlay section");
2599 /* First, find a section matching the user supplied argument */
2600 ALL_OBJSECTIONS (objfile
, sec
)
2601 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
2603 /* Now, check to see if the section is an overlay. */
2604 bfdsec
= sec
->the_bfd_section
;
2605 if (!section_is_overlay (bfdsec
))
2606 continue; /* not an overlay section */
2608 /* Mark the overlay as "mapped" */
2609 sec
->ovly_mapped
= 1;
2611 /* Next, make a pass and unmap any sections that are
2612 overlapped by this new section: */
2613 ALL_OBJSECTIONS (objfile2
, sec2
)
2614 if (sec2
->ovly_mapped
&&
2616 sec
->the_bfd_section
!= sec2
->the_bfd_section
&&
2617 (pc_in_mapped_range (sec2
->addr
, sec
->the_bfd_section
) ||
2618 pc_in_mapped_range (sec2
->endaddr
, sec
->the_bfd_section
)))
2621 printf_filtered ("Note: section %s unmapped by overlap\n",
2622 bfd_section_name (objfile
->obfd
,
2623 sec2
->the_bfd_section
));
2624 sec2
->ovly_mapped
= 0; /* sec2 overlaps sec: unmap sec2 */
2628 error ("No overlay section called %s", args
);
2631 /* Function: unmap_overlay_command
2632 Mark the overlay section as unmapped
2633 (ie. resident in its LMA address range, rather than the VMA range). */
2636 unmap_overlay_command (args
, from_tty
)
2640 struct objfile
*objfile
;
2641 struct obj_section
*sec
;
2643 if (!overlay_debugging
)
2644 error ("Overlay debugging not enabled. Use the 'OVERLAY ON' command.");
2646 if (args
== 0 || *args
== 0)
2647 error ("Argument required: name of an overlay section");
2649 /* First, find a section matching the user supplied argument */
2650 ALL_OBJSECTIONS (objfile
, sec
)
2651 if (!strcmp (bfd_section_name (objfile
->obfd
, sec
->the_bfd_section
), args
))
2653 if (!sec
->ovly_mapped
)
2654 error ("Section %s is not mapped", args
);
2655 sec
->ovly_mapped
= 0;
2658 error ("No overlay section called %s", args
);
2661 /* Function: overlay_auto_command
2662 A utility command to turn on overlay debugging.
2663 Possibly this should be done via a set/show command. */
2666 overlay_auto_command (args
, from_tty
)
2670 overlay_debugging
= -1;
2672 printf_filtered ("Automatic overlay debugging enabled.");
2675 /* Function: overlay_manual_command
2676 A utility command to turn on overlay debugging.
2677 Possibly this should be done via a set/show command. */
2680 overlay_manual_command (args
, from_tty
)
2684 overlay_debugging
= 1;
2686 printf_filtered ("Overlay debugging enabled.");
2689 /* Function: overlay_off_command
2690 A utility command to turn on overlay debugging.
2691 Possibly this should be done via a set/show command. */
2694 overlay_off_command (args
, from_tty
)
2698 overlay_debugging
= 0;
2700 printf_filtered ("Overlay debugging disabled.");
2704 overlay_load_command (args
, from_tty
)
2708 if (target_overlay_update
)
2709 (*target_overlay_update
) (NULL
);
2711 error ("This target does not know how to read its overlay state.");
2714 /* Function: overlay_command
2715 A place-holder for a mis-typed command */
2717 /* Command list chain containing all defined "overlay" subcommands. */
2718 struct cmd_list_element
*overlaylist
;
2721 overlay_command (args
, from_tty
)
2726 ("\"overlay\" must be followed by the name of an overlay command.\n");
2727 help_list (overlaylist
, "overlay ", -1, gdb_stdout
);
2731 /* Target Overlays for the "Simplest" overlay manager:
2733 This is GDB's default target overlay layer. It works with the
2734 minimal overlay manager supplied as an example by Cygnus. The
2735 entry point is via a function pointer "target_overlay_update",
2736 so targets that use a different runtime overlay manager can
2737 substitute their own overlay_update function and take over the
2740 The overlay_update function pokes around in the target's data structures
2741 to see what overlays are mapped, and updates GDB's overlay mapping with
2744 In this simple implementation, the target data structures are as follows:
2745 unsigned _novlys; /# number of overlay sections #/
2746 unsigned _ovly_table[_novlys][4] = {
2747 {VMA, SIZE, LMA, MAPPED}, /# one entry per overlay section #/
2748 {..., ..., ..., ...},
2750 unsigned _novly_regions; /# number of overlay regions #/
2751 unsigned _ovly_region_table[_novly_regions][3] = {
2752 {VMA, SIZE, MAPPED_TO_LMA}, /# one entry per overlay region #/
2755 These functions will attempt to update GDB's mappedness state in the
2756 symbol section table, based on the target's mappedness state.
2758 To do this, we keep a cached copy of the target's _ovly_table, and
2759 attempt to detect when the cached copy is invalidated. The main
2760 entry point is "simple_overlay_update(SECT), which looks up SECT in
2761 the cached table and re-reads only the entry for that section from
2762 the target (whenever possible).
2765 /* Cached, dynamically allocated copies of the target data structures: */
2766 static unsigned (*cache_ovly_table
)[4] = 0;
2768 static unsigned (*cache_ovly_region_table
)[3] = 0;
2770 static unsigned cache_novlys
= 0;
2772 static unsigned cache_novly_regions
= 0;
2774 static CORE_ADDR cache_ovly_table_base
= 0;
2776 static CORE_ADDR cache_ovly_region_table_base
= 0;
2780 VMA
, SIZE
, LMA
, MAPPED
2782 #define TARGET_LONG_BYTES (TARGET_LONG_BIT / TARGET_CHAR_BIT)
2784 /* Throw away the cached copy of _ovly_table */
2786 simple_free_overlay_table ()
2788 if (cache_ovly_table
)
2789 free (cache_ovly_table
);
2791 cache_ovly_table
= NULL
;
2792 cache_ovly_table_base
= 0;
2796 /* Throw away the cached copy of _ovly_region_table */
2798 simple_free_overlay_region_table ()
2800 if (cache_ovly_region_table
)
2801 free (cache_ovly_region_table
);
2802 cache_novly_regions
= 0;
2803 cache_ovly_region_table
= NULL
;
2804 cache_ovly_region_table_base
= 0;
2808 /* Read an array of ints from the target into a local buffer.
2809 Convert to host order. int LEN is number of ints */
2811 read_target_long_array (memaddr
, myaddr
, len
)
2813 unsigned int *myaddr
;
2816 char *buf
= alloca (len
* TARGET_LONG_BYTES
);
2819 read_memory (memaddr
, buf
, len
* TARGET_LONG_BYTES
);
2820 for (i
= 0; i
< len
; i
++)
2821 myaddr
[i
] = extract_unsigned_integer (TARGET_LONG_BYTES
* i
+ buf
,
2825 /* Find and grab a copy of the target _ovly_table
2826 (and _novlys, which is needed for the table's size) */
2828 simple_read_overlay_table ()
2830 struct minimal_symbol
*msym
;
2832 simple_free_overlay_table ();
2833 msym
= lookup_minimal_symbol ("_novlys", 0, 0);
2835 cache_novlys
= read_memory_integer (SYMBOL_VALUE_ADDRESS (msym
), 4);
2837 return 0; /* failure */
2838 cache_ovly_table
= (void *) xmalloc (cache_novlys
* sizeof (*cache_ovly_table
));
2839 if (cache_ovly_table
!= NULL
)
2841 msym
= lookup_minimal_symbol ("_ovly_table", 0, 0);
2844 cache_ovly_table_base
= SYMBOL_VALUE_ADDRESS (msym
);
2845 read_target_long_array (cache_ovly_table_base
,
2846 (int *) cache_ovly_table
,
2850 return 0; /* failure */
2853 return 0; /* failure */
2854 return 1; /* SUCCESS */
2858 /* Find and grab a copy of the target _ovly_region_table
2859 (and _novly_regions, which is needed for the table's size) */
2861 simple_read_overlay_region_table ()
2863 struct minimal_symbol
*msym
;
2865 simple_free_overlay_region_table ();
2866 msym
= lookup_minimal_symbol ("_novly_regions", 0, 0);
2868 cache_novly_regions
= read_memory_integer (SYMBOL_VALUE_ADDRESS (msym
), 4);
2870 return 0; /* failure */
2871 cache_ovly_region_table
= (void *) xmalloc (cache_novly_regions
* 12);
2872 if (cache_ovly_region_table
!= NULL
)
2874 msym
= lookup_minimal_symbol ("_ovly_region_table", 0, 0);
2877 cache_ovly_region_table_base
= SYMBOL_VALUE_ADDRESS (msym
);
2878 read_target_long_array (cache_ovly_region_table_base
,
2879 (int *) cache_ovly_region_table
,
2880 cache_novly_regions
* 3);
2883 return 0; /* failure */
2886 return 0; /* failure */
2887 return 1; /* SUCCESS */
2891 /* Function: simple_overlay_update_1
2892 A helper function for simple_overlay_update. Assuming a cached copy
2893 of _ovly_table exists, look through it to find an entry whose vma,
2894 lma and size match those of OSECT. Re-read the entry and make sure
2895 it still matches OSECT (else the table may no longer be valid).
2896 Set OSECT's mapped state to match the entry. Return: 1 for
2897 success, 0 for failure. */
2900 simple_overlay_update_1 (osect
)
2901 struct obj_section
*osect
;
2905 size
= bfd_get_section_size_before_reloc (osect
->the_bfd_section
);
2906 for (i
= 0; i
< cache_novlys
; i
++)
2907 if (cache_ovly_table
[i
][VMA
] == osect
->the_bfd_section
->vma
&&
2908 cache_ovly_table
[i
][LMA
] == osect
->the_bfd_section
->lma
/* &&
2909 cache_ovly_table[i][SIZE] == size */ )
2911 read_target_long_array (cache_ovly_table_base
+ i
* TARGET_LONG_BYTES
,
2912 (int *) cache_ovly_table
[i
], 4);
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 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
2920 else /* Warning! Warning! Target's ovly table has changed! */
2926 /* Function: simple_overlay_update
2927 If OSECT is NULL, then update all sections' mapped state
2928 (after re-reading the entire target _ovly_table).
2929 If OSECT is non-NULL, then try to find a matching entry in the
2930 cached ovly_table and update only OSECT's mapped state.
2931 If a cached entry can't be found or the cache isn't valid, then
2932 re-read the entire cache, and go ahead and update all sections. */
2935 simple_overlay_update (osect
)
2936 struct obj_section
*osect
;
2938 struct objfile
*objfile
;
2940 /* Were we given an osect to look up? NULL means do all of them. */
2942 /* Have we got a cached copy of the target's overlay table? */
2943 if (cache_ovly_table
!= NULL
)
2944 /* Does its cached location match what's currently in the symtab? */
2945 if (cache_ovly_table_base
==
2946 SYMBOL_VALUE_ADDRESS (lookup_minimal_symbol ("_ovly_table", 0, 0)))
2947 /* Then go ahead and try to look up this single section in the cache */
2948 if (simple_overlay_update_1 (osect
))
2949 /* Found it! We're done. */
2952 /* Cached table no good: need to read the entire table anew.
2953 Or else we want all the sections, in which case it's actually
2954 more efficient to read the whole table in one block anyway. */
2956 if (simple_read_overlay_table () == 0) /* read failed? No table? */
2958 warning ("Failed to read the target overlay mapping table.");
2961 /* Now may as well update all sections, even if only one was requested. */
2962 ALL_OBJSECTIONS (objfile
, osect
)
2963 if (section_is_overlay (osect
->the_bfd_section
))
2967 size
= bfd_get_section_size_before_reloc (osect
->the_bfd_section
);
2968 for (i
= 0; i
< cache_novlys
; i
++)
2969 if (cache_ovly_table
[i
][VMA
] == osect
->the_bfd_section
->vma
&&
2970 cache_ovly_table
[i
][LMA
] == osect
->the_bfd_section
->lma
/* &&
2971 cache_ovly_table[i][SIZE] == size */ )
2972 { /* obj_section matches i'th entry in ovly_table */
2973 osect
->ovly_mapped
= cache_ovly_table
[i
][MAPPED
];
2974 break; /* finished with inner for loop: break out */
2981 _initialize_symfile ()
2983 struct cmd_list_element
*c
;
2985 c
= add_cmd ("symbol-file", class_files
, symbol_file_command
,
2986 "Load symbol table from executable file FILE.\n\
2987 The `file' command can also load symbol tables, as well as setting the file\n\
2988 to execute.", &cmdlist
);
2989 c
->completer
= filename_completer
;
2991 c
= add_cmd ("add-symbol-file", class_files
, add_symbol_file_command
,
2992 "Usage: add-symbol-file FILE ADDR\n\
2993 Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\
2994 ADDR is the starting address of the file's text.",
2996 c
->completer
= filename_completer
;
2998 c
= add_cmd ("add-shared-symbol-files", class_files
,
2999 add_shared_symbol_files_command
,
3000 "Load the symbols from shared objects in the dynamic linker's link map.",
3002 c
= add_alias_cmd ("assf", "add-shared-symbol-files", class_files
, 1,
3005 c
= add_cmd ("load", class_files
, load_command
,
3006 "Dynamically load FILE into the running program, and record its symbols\n\
3007 for access from GDB.", &cmdlist
);
3008 c
->completer
= filename_completer
;
3011 (add_set_cmd ("symbol-reloading", class_support
, var_boolean
,
3012 (char *) &symbol_reloading
,
3013 "Set dynamic symbol table reloading multiple times in one run.",
3017 add_prefix_cmd ("overlay", class_support
, overlay_command
,
3018 "Commands for debugging overlays.", &overlaylist
,
3019 "overlay ", 0, &cmdlist
);
3021 add_com_alias ("ovly", "overlay", class_alias
, 1);
3022 add_com_alias ("ov", "overlay", class_alias
, 1);
3024 add_cmd ("map-overlay", class_support
, map_overlay_command
,
3025 "Assert that an overlay section is mapped.", &overlaylist
);
3027 add_cmd ("unmap-overlay", class_support
, unmap_overlay_command
,
3028 "Assert that an overlay section is unmapped.", &overlaylist
);
3030 add_cmd ("list-overlays", class_support
, list_overlays_command
,
3031 "List mappings of overlay sections.", &overlaylist
);
3033 add_cmd ("manual", class_support
, overlay_manual_command
,
3034 "Enable overlay debugging.", &overlaylist
);
3035 add_cmd ("off", class_support
, overlay_off_command
,
3036 "Disable overlay debugging.", &overlaylist
);
3037 add_cmd ("auto", class_support
, overlay_auto_command
,
3038 "Enable automatic overlay debugging.", &overlaylist
);
3039 add_cmd ("load-target", class_support
, overlay_load_command
,
3040 "Read the overlay mapping state from the target.", &overlaylist
);
3042 /* Filename extension to source language lookup table: */
3043 init_filename_language_table ();
3044 c
= add_set_cmd ("extension-language", class_files
, var_string_noescape
,
3046 "Set mapping between filename extension and source language.\n\
3047 Usage: set extension-language .foo bar",
3049 c
->function
.cfunc
= set_ext_lang_command
;
3051 add_info ("extensions", info_ext_lang_command
,
3052 "All filename extensions associated with a source language.");