1 /* Print and select stack frames for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23 #include "gdb_string.h"
27 #include "expression.h"
33 #include "breakpoint.h"
40 static void return_command PARAMS ((char *, int));
42 static void down_command PARAMS ((char *, int));
44 static void down_silently_command PARAMS ((char *, int));
46 static void up_command PARAMS ((char *, int));
48 static void up_silently_command PARAMS ((char *, int));
50 static void frame_command PARAMS ((char *, int));
52 static void select_frame_command PARAMS ((char *, int));
54 static void args_info PARAMS ((char *, int));
56 static void print_frame_arg_vars PARAMS ((struct frame_info *, GDB_FILE *));
58 static void catch_info PARAMS ((char *, int));
60 static void locals_info PARAMS ((char *, int));
62 static void print_frame_label_vars PARAMS ((struct frame_info *, int,
65 static void print_frame_local_vars PARAMS ((struct frame_info *, GDB_FILE *));
67 static int print_block_frame_labels PARAMS ((struct block *, int *,
70 static int print_block_frame_locals PARAMS ((struct block *,
74 static void backtrace_command PARAMS ((char *, int));
76 static struct frame_info *parse_frame_specification PARAMS ((char *));
78 static void frame_info PARAMS ((char *, int));
80 extern int addressprint; /* Print addresses, or stay symbolic only? */
81 extern int info_verbose; /* Verbosity of symbol reading msgs */
82 extern int lines_to_list; /* # of lines "list" command shows by default */
84 /* The "selected" stack frame is used by default for local and arg access.
85 May be zero, for no selected frame. */
87 struct frame_info *selected_frame;
89 /* Level of the selected frame:
90 0 for innermost, 1 for its caller, ...
91 or -1 for frame specified by address with no defined level. */
93 int selected_frame_level;
95 /* Zero means do things normally; we are interacting directly with the
96 user. One means print the full filename and linenumber when a
97 frame is printed, and do so in a format emacs18/emacs19.22 can
98 parse. Two means print similar annotations, but in many more
99 cases and in a slightly different syntax. */
101 int annotation_level = 0;
104 struct print_stack_frame_args {
105 struct frame_info *fi;
111 static int print_stack_frame_stub PARAMS ((char *));
113 /* Pass the args the way catch_errors wants them. */
115 print_stack_frame_stub (args)
118 struct print_stack_frame_args *p = (struct print_stack_frame_args *)args;
120 print_frame_info (p->fi, p->level, p->source, p->args);
124 /* Print a stack frame briefly. FRAME_INFI should be the frame info
125 and LEVEL should be its level in the stack (or -1 for level not defined).
126 This prints the level, the function executing, the arguments,
127 and the file name and line number.
128 If the pc is not at the beginning of the source line,
129 the actual pc is printed at the beginning.
131 If SOURCE is 1, print the source line as well.
132 If SOURCE is -1, print ONLY the source line. */
135 print_stack_frame (fi, level, source)
136 struct frame_info *fi;
140 struct print_stack_frame_args args;
144 args.source = source;
147 catch_errors (print_stack_frame_stub, (char *)&args, "", RETURN_MASK_ALL);
150 struct print_args_args {
152 struct frame_info *fi;
155 static int print_args_stub PARAMS ((char *));
157 /* Pass the args the way catch_errors wants them. */
160 print_args_stub (args)
164 struct print_args_args *p = (struct print_args_args *)args;
166 FRAME_NUM_ARGS (numargs, (p->fi));
167 print_frame_args (p->func, p->fi, numargs, gdb_stdout);
171 /* LEVEL is the level of the frame, or -1 if it is the innermost frame
172 but we don't want to print the level. */
175 print_frame_info (fi, level, source, args)
176 struct frame_info *fi;
181 struct symtab_and_line sal;
183 register char *funname = 0;
184 enum language funlang = language_unknown;
187 char buf[MAX_REGISTER_RAW_SIZE];
190 /* On the 68k, this spends too much time in m68k_find_saved_regs. */
192 /* Get the value of SP_REGNUM relative to the frame. */
193 get_saved_register (buf, (int *)NULL, (CORE_ADDR *)NULL,
194 FRAME_INFO_ID (fi), SP_REGNUM, (enum lval_type *)NULL);
195 sp = extract_address (buf, REGISTER_RAW_SIZE (SP_REGNUM));
197 /* This is not a perfect test, because if a function alloca's some
198 memory, puts some code there, and then jumps into it, then the test
199 will succeed even though there is no call dummy. Probably best is
200 to check for a bp_call_dummy breakpoint. */
201 if (PC_IN_CALL_DUMMY (fi->pc, sp, fi->frame))
203 if (frame_in_dummy (fi))
206 annotate_frame_begin (level == -1 ? 0 : level, fi->pc);
208 /* Do this regardless of SOURCE because we don't have any source
209 to list for this frame. */
211 printf_filtered ("#%-2d ", level);
212 annotate_function_call ();
213 printf_filtered ("<function called from gdb>\n");
214 annotate_frame_end ();
217 if (fi->signal_handler_caller)
219 annotate_frame_begin (level == -1 ? 0 : level, fi->pc);
221 /* Do this regardless of SOURCE because we don't have any source
222 to list for this frame. */
224 printf_filtered ("#%-2d ", level);
225 annotate_signal_handler_caller ();
226 printf_filtered ("<signal handler called>\n");
227 annotate_frame_end ();
231 /* If fi is not the innermost frame, that normally means that fi->pc
232 points to *after* the call instruction, and we want to get the line
233 containing the call, never the next line. But if the next frame is
234 a signal_handler_caller or a dummy frame, then the next frame was
235 not entered as the result of a call, and we want to get the line
236 containing fi->pc. */
238 find_pc_line (fi->pc,
240 && !fi->next->signal_handler_caller
241 && !frame_in_dummy (fi->next));
243 func = find_pc_function (fi->pc);
246 /* In certain pathological cases, the symtabs give the wrong
247 function (when we are in the first function in a file which
248 is compiled without debugging symbols, the previous function
249 is compiled with debugging symbols, and the "foo.o" symbol
250 that is supposed to tell us where the file with debugging symbols
251 ends has been truncated by ar because it is longer than 15
252 characters). This also occurs if the user uses asm() to create
253 a function but not stabs for it (in a file compiled -g).
255 So look in the minimal symbol tables as well, and if it comes
256 up with a larger address for the function use that instead.
257 I don't think this can ever cause any problems; there shouldn't
258 be any minimal symbols in the middle of a function; if this is
259 ever changed many parts of GDB will need to be changed (and we'll
260 create a find_pc_minimal_function or some such). */
262 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
264 && (SYMBOL_VALUE_ADDRESS (msymbol)
265 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
268 /* There is no particular reason to think the line number
269 information is wrong. Someone might have just put in
270 a label with asm() but left the line numbers alone. */
271 /* In this case we have no way of knowing the source file
272 and line number, so don't print them. */
275 /* We also don't know anything about the function besides
276 its address and name. */
278 funname = SYMBOL_NAME (msymbol);
279 funlang = SYMBOL_LANGUAGE (msymbol);
283 funname = SYMBOL_NAME (func);
284 funlang = SYMBOL_LANGUAGE (func);
289 if (find_pc_section (fi->pc))
291 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
294 funname = SYMBOL_NAME (msymbol);
295 funlang = SYMBOL_LANGUAGE (msymbol);
300 if (source >= 0 || !sal.symtab)
302 annotate_frame_begin (level == -1 ? 0 : level, fi->pc);
305 printf_filtered ("#%-2d ", level);
307 if (fi->pc != sal.pc || !sal.symtab)
309 annotate_frame_address ();
310 print_address_numeric (fi->pc, 1, gdb_stdout);
311 annotate_frame_address_end ();
312 printf_filtered (" in ");
314 annotate_frame_function_name ();
315 fprintf_symbol_filtered (gdb_stdout, funname ? funname : "??", funlang,
318 annotate_frame_args ();
319 fputs_filtered (" (", gdb_stdout);
322 struct print_args_args args;
325 catch_errors (print_args_stub, (char *)&args, "", RETURN_MASK_ALL);
328 printf_filtered (")");
329 if (sal.symtab && sal.symtab->filename)
331 annotate_frame_source_begin ();
333 printf_filtered (" at ");
334 annotate_frame_source_file ();
335 printf_filtered ("%s", sal.symtab->filename);
336 annotate_frame_source_file_end ();
337 printf_filtered (":");
338 annotate_frame_source_line ();
339 printf_filtered ("%d", sal.line);
340 annotate_frame_source_end ();
343 #ifdef PC_LOAD_SEGMENT
344 /* If we couldn't print out function name but if can figure out what
345 load segment this pc value is from, at least print out some info
346 about its load segment. */
349 annotate_frame_where ();
351 printf_filtered (" from %s", PC_LOAD_SEGMENT (fi->pc));
357 char *lib = PC_SOLIB (fi->pc);
360 annotate_frame_where ();
362 printf_filtered (" from %s", lib);
366 printf_filtered ("\n");
369 if ((source != 0) && sal.symtab)
372 int mid_statement = source < 0 && fi->pc != sal.pc;
373 if (annotation_level)
374 done = identify_source_line (sal.symtab, sal.line, mid_statement,
378 if (addressprint && mid_statement)
380 print_address_numeric (fi->pc, 1, gdb_stdout);
381 printf_filtered ("\t");
383 if (print_frame_info_listing_hook)
384 print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0);
386 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
388 current_source_line = max (sal.line - lines_to_list/2, 1);
391 set_default_breakpoint (1, fi->pc, sal.symtab, sal.line);
393 annotate_frame_end ();
395 gdb_flush (gdb_stdout);
398 /* Read a frame specification in whatever the appropriate format is.
399 Call error() if the specification is in any way invalid (i.e.
400 this function never returns NULL). */
402 static struct frame_info *
403 parse_frame_specification (frame_exp)
408 CORE_ADDR args[MAXARGS];
412 char *addr_string, *p;
413 struct cleanup *tmp_cleanup;
415 while (*frame_exp == ' ') frame_exp++;
419 if (numargs > MAXARGS)
420 error ("Too many args in frame specification");
421 /* Parse an argument. */
422 for (p = frame_exp; *p && *p != ' '; p++)
424 addr_string = savestring(frame_exp, p - frame_exp);
427 tmp_cleanup = make_cleanup (free, addr_string);
428 args[numargs++] = parse_and_eval_address (addr_string);
429 do_cleanups (tmp_cleanup);
432 /* Skip spaces, move to possible next arg. */
433 while (*p == ' ') p++;
441 if (selected_frame == NULL)
442 error ("No selected frame.");
443 return selected_frame;
448 struct frame_info *fid =
449 find_relative_frame (get_current_frame (), &level);
450 struct frame_info *tfid;
453 /* find_relative_frame was successful */
456 /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications
457 take at least 2 addresses. It is important to detect this case
458 here so that "frame 100" does not give a confusing error message
459 like "frame specification requires two addresses". This of course
460 does not solve the "frame 100" problem for machines on which
461 a frame specification can be made with one address. To solve
462 that, we need a new syntax for a specifying a frame by address.
463 I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for
464 two args, etc.), but people might think that is too much typing,
465 so I guess *0x23,0x45 would be a possible alternative (commas
466 really should be used instead of spaces to delimit; using spaces
467 normally works in an expression). */
468 #ifdef SETUP_ARBITRARY_FRAME
469 error ("No frame %d", args[0]);
472 /* If (s)he specifies the frame with an address, he deserves what
473 (s)he gets. Still, give the highest one that matches. */
475 for (fid = get_current_frame ();
476 fid && fid->frame != args[0];
477 fid = get_prev_frame (fid))
481 while ((tfid = get_prev_frame (fid)) &&
482 (tfid->frame == args[0]))
485 /* We couldn't identify the frame as an existing frame, but
486 perhaps we can create one with a single argument. */
490 #ifdef SETUP_ARBITRARY_FRAME
491 return SETUP_ARBITRARY_FRAME (numargs, args);
493 /* Usual case. Do it here rather than have everyone supply
494 a SETUP_ARBITRARY_FRAME that does this. */
496 return create_new_frame (args[0], 0);
497 error ("Too many args in frame specification");
504 /* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except
505 that if it is unsure about the answer, it returns 0
506 instead of guessing (this happens on the VAX and i960, for example).
508 On most machines, we never have to guess about the args address,
509 so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */
510 #if !defined (FRAME_ARGS_ADDRESS_CORRECT)
511 #define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS
514 /* Print verbosely the selected frame or the frame at address ADDR.
515 This means absolutely all information in the frame is printed. */
518 frame_info (addr_exp, from_tty)
522 struct frame_info *fi;
523 struct frame_saved_regs fsr;
524 struct symtab_and_line sal;
527 struct frame_info *calling_frame_info;
528 int i, count, numregs;
530 enum language funlang = language_unknown;
532 if (!target_has_stack)
535 fi = parse_frame_specification (addr_exp);
537 error ("Invalid frame specified.");
539 sal = find_pc_line (fi->pc,
541 && !fi->next->signal_handler_caller
542 && !frame_in_dummy (fi->next));
543 func = get_frame_function (fi);
544 s = find_pc_symtab(fi->pc);
547 funname = SYMBOL_NAME (func);
548 funlang = SYMBOL_LANGUAGE (func);
552 register struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (fi->pc);
555 funname = SYMBOL_NAME (msymbol);
556 funlang = SYMBOL_LANGUAGE (msymbol);
559 calling_frame_info = get_prev_frame (fi);
561 if (!addr_exp && selected_frame_level >= 0)
563 printf_filtered ("Stack level %d, frame at ", selected_frame_level);
564 print_address_numeric (fi->frame, 1, gdb_stdout);
565 printf_filtered (":\n");
569 printf_filtered ("Stack frame at ");
570 print_address_numeric (fi->frame, 1, gdb_stdout);
571 printf_filtered (":\n");
573 printf_filtered (" %s = ", reg_names[PC_REGNUM]);
574 print_address_numeric (fi->pc, 1, gdb_stdout);
579 printf_filtered (" in ");
580 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
581 DMGL_ANSI | DMGL_PARAMS);
585 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
586 puts_filtered ("; ");
588 printf_filtered ("saved %s ", reg_names[PC_REGNUM]);
589 print_address_numeric (FRAME_SAVED_PC (fi), 1, gdb_stdout);
590 printf_filtered ("\n");
594 #ifdef FRAMELESS_FUNCTION_INVOCATION
595 FRAMELESS_FUNCTION_INVOCATION (fi, frameless);
598 printf_filtered (" (FRAMELESS),");
601 if (calling_frame_info)
603 printf_filtered (" called by frame at ");
604 print_address_numeric (calling_frame_info->frame, 1, gdb_stdout);
606 if (fi->next && calling_frame_info)
611 printf_filtered (" caller of frame at ");
612 print_address_numeric (fi->next->frame, 1, gdb_stdout);
614 if (fi->next || calling_frame_info)
615 puts_filtered ("\n");
617 printf_filtered (" source language %s.\n", language_str (s->language));
619 #ifdef PRINT_EXTRA_FRAME_INFO
620 PRINT_EXTRA_FRAME_INFO (fi);
624 /* Address of the argument list for this frame, or 0. */
625 CORE_ADDR arg_list = FRAME_ARGS_ADDRESS_CORRECT (fi);
626 /* Number of args for this frame, or -1 if unknown. */
630 printf_filtered (" Arglist at unknown address.\n");
633 printf_filtered (" Arglist at ");
634 print_address_numeric (arg_list, 1, gdb_stdout);
635 printf_filtered (",");
637 FRAME_NUM_ARGS (numargs, fi);
639 puts_filtered (" args: ");
640 else if (numargs == 0)
641 puts_filtered (" no args.");
642 else if (numargs == 1)
643 puts_filtered (" 1 arg: ");
645 printf_filtered (" %d args: ", numargs);
646 print_frame_args (func, fi, numargs, gdb_stdout);
647 puts_filtered ("\n");
651 /* Address of the local variables for this frame, or 0. */
652 CORE_ADDR arg_list = FRAME_LOCALS_ADDRESS (fi);
655 printf_filtered (" Locals at unknown address,");
658 printf_filtered (" Locals at ");
659 print_address_numeric (arg_list, 1, gdb_stdout);
660 printf_filtered (",");
664 #if defined (FRAME_FIND_SAVED_REGS)
665 get_frame_saved_regs (fi, &fsr);
666 /* The sp is special; what's returned isn't the save address, but
667 actually the value of the previous frame's sp. */
668 printf_filtered (" Previous frame's sp is ");
669 print_address_numeric (fsr.regs[SP_REGNUM], 1, gdb_stdout);
670 printf_filtered ("\n");
672 numregs = ARCH_NUM_REGS;
673 for (i = 0; i < numregs; i++)
674 if (fsr.regs[i] && i != SP_REGNUM)
677 puts_filtered (" Saved registers:\n ");
681 printf_filtered (" %s at ", reg_names[i]);
682 print_address_numeric (fsr.regs[i], 1, gdb_stdout);
686 puts_filtered ("\n");
687 #else /* Have FRAME_FIND_SAVED_REGS. */
688 /* We could get some information about saved registers by calling
689 get_saved_register on each register. Which info goes with which frame
690 is necessarily lost, however, and I suspect that the users don't care
691 whether they get the info. */
692 puts_filtered ("\n");
693 #endif /* Have FRAME_FIND_SAVED_REGS. */
697 /* Set a limit on the number of frames printed by default in a
700 static int backtrace_limit;
703 set_backtrace_limit_command (count_exp, from_tty)
707 int count = parse_and_eval_address (count_exp);
710 error ("Negative argument not meaningful as backtrace limit.");
712 backtrace_limit = count;
716 backtrace_limit_info (arg, from_tty)
721 error ("\"Info backtrace-limit\" takes no arguments.");
723 printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit);
727 /* Print briefly all stack frames or just the innermost COUNT frames. */
730 backtrace_command (count_exp, from_tty)
734 struct frame_info *fi;
737 register struct frame_info *trailing;
738 register int trailing_level;
740 if (!target_has_stack)
743 /* The following code must do two things. First, it must
744 set the variable TRAILING to the frame from which we should start
745 printing. Second, it must set the variable count to the number
746 of frames which we should print, or -1 if all of them. */
747 trailing = get_current_frame ();
751 count = parse_and_eval_address (count_exp);
754 struct frame_info *current;
759 while (current && count--)
762 current = get_prev_frame (current);
765 /* Will stop when CURRENT reaches the top of the stack. TRAILING
766 will be COUNT below it. */
770 trailing = get_prev_frame (trailing);
771 current = get_prev_frame (current);
783 struct partial_symtab *ps;
785 /* Read in symbols for all of the frames. Need to do this in
786 a separate pass so that "Reading in symbols for xxx" messages
787 don't screw up the appearance of the backtrace. Also
788 if people have strong opinions against reading symbols for
789 backtrace this may have to be an option. */
793 fi = get_prev_frame (fi))
796 ps = find_pc_psymtab (fi->pc);
798 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */
802 for (i = 0, fi = trailing;
804 i++, fi = get_prev_frame (fi))
808 /* Don't use print_stack_frame; if an error() occurs it probably
809 means further attempts to backtrace would fail (on the other
810 hand, perhaps the code does or could be fixed to make sure
811 the frame->prev field gets set to NULL in that case). */
812 print_frame_info (fi, trailing_level + i, 0, 1);
815 /* If we've stopped before the end, mention that. */
817 printf_filtered ("(More stack frames follow...)\n");
820 /* Print the local variables of a block B active in FRAME.
821 Return 1 if any variables were printed; 0 otherwise. */
824 print_block_frame_locals (b, fi, stream)
826 register struct frame_info *fi;
827 register GDB_FILE *stream;
831 register struct symbol *sym;
832 register int values_printed = 0;
834 nsyms = BLOCK_NSYMS (b);
836 for (i = 0; i < nsyms; i++)
838 sym = BLOCK_SYM (b, i);
839 switch (SYMBOL_CLASS (sym))
846 fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
847 fputs_filtered (" = ", stream);
848 print_variable_value (sym, fi, stream);
849 fprintf_filtered (stream, "\n");
853 /* Ignore symbols which are not locals. */
857 return values_printed;
860 /* Same, but print labels. */
863 print_block_frame_labels (b, have_default, stream)
866 register GDB_FILE *stream;
870 register struct symbol *sym;
871 register int values_printed = 0;
873 nsyms = BLOCK_NSYMS (b);
875 for (i = 0; i < nsyms; i++)
877 sym = BLOCK_SYM (b, i);
878 if (STREQ (SYMBOL_NAME (sym), "default"))
884 if (SYMBOL_CLASS (sym) == LOC_LABEL)
886 struct symtab_and_line sal;
887 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
889 fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
892 fprintf_filtered (stream, " ");
893 print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
895 fprintf_filtered (stream, " in file %s, line %d\n",
896 sal.symtab->filename, sal.line);
899 return values_printed;
902 /* Print on STREAM all the local variables in frame FRAME,
903 including all the blocks active in that frame
906 Returns 1 if the job was done,
907 or 0 if nothing was printed because we have no info
908 on the function running in FRAME. */
911 print_frame_local_vars (fi, stream)
912 register struct frame_info *fi;
913 register GDB_FILE *stream;
915 register struct block *block = get_frame_block (fi);
916 register int values_printed = 0;
920 fprintf_filtered (stream, "No symbol table info available.\n");
926 if (print_block_frame_locals (block, fi, stream))
928 /* After handling the function's top-level block, stop.
929 Don't continue to its superblock, the block of
931 if (BLOCK_FUNCTION (block))
933 block = BLOCK_SUPERBLOCK (block);
938 fprintf_filtered (stream, "No locals.\n");
942 /* Same, but print labels. */
945 print_frame_label_vars (fi, this_level_only, stream)
946 register struct frame_info *fi;
948 register GDB_FILE *stream;
950 register struct blockvector *bl;
951 register struct block *block = get_frame_block (fi);
952 register int values_printed = 0;
953 int index, have_default = 0;
954 char *blocks_printed;
955 CORE_ADDR pc = fi->pc;
959 fprintf_filtered (stream, "No symbol table info available.\n");
963 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
964 blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
965 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
969 CORE_ADDR end = BLOCK_END (block) - 4;
972 if (bl != blockvector_for_pc (end, &index))
973 error ("blockvector blotch");
974 if (BLOCKVECTOR_BLOCK (bl, index) != block)
975 error ("blockvector botch");
976 last_index = BLOCKVECTOR_NBLOCKS (bl);
979 /* Don't print out blocks that have gone by. */
980 while (index < last_index
981 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
984 while (index < last_index
985 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
987 if (blocks_printed[index] == 0)
989 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
991 blocks_printed[index] = 1;
997 if (values_printed && this_level_only)
1000 /* After handling the function's top-level block, stop.
1001 Don't continue to its superblock, the block of
1002 per-file symbols. */
1003 if (BLOCK_FUNCTION (block))
1005 block = BLOCK_SUPERBLOCK (block);
1008 if (!values_printed && !this_level_only)
1010 fprintf_filtered (stream, "No catches.\n");
1016 locals_info (args, from_tty)
1020 if (!selected_frame)
1021 error ("No frame selected.");
1022 print_frame_local_vars (selected_frame, gdb_stdout);
1026 catch_info (ignore, from_tty)
1030 if (!selected_frame)
1031 error ("No frame selected.");
1032 print_frame_label_vars (selected_frame, 0, gdb_stdout);
1036 print_frame_arg_vars (fi, stream)
1037 register struct frame_info *fi;
1038 register GDB_FILE *stream;
1040 struct symbol *func = get_frame_function (fi);
1041 register struct block *b;
1044 register struct symbol *sym, *sym2;
1045 register int values_printed = 0;
1049 fprintf_filtered (stream, "No symbol table info available.\n");
1053 b = SYMBOL_BLOCK_VALUE (func);
1054 nsyms = BLOCK_NSYMS (b);
1056 for (i = 0; i < nsyms; i++)
1058 sym = BLOCK_SYM (b, i);
1059 switch (SYMBOL_CLASS (sym))
1065 case LOC_REGPARM_ADDR:
1066 case LOC_BASEREG_ARG:
1068 fputs_filtered (SYMBOL_SOURCE_NAME (sym), stream);
1069 fputs_filtered (" = ", stream);
1071 /* We have to look up the symbol because arguments can have
1072 two entries (one a parameter, one a local) and the one we
1073 want is the local, which lookup_symbol will find for us.
1074 This includes gcc1 (not gcc2) on the sparc when passing a
1075 small structure and gcc2 when the argument type is float
1076 and it is passed as a double and converted to float by
1077 the prologue (in the latter case the type of the LOC_ARG
1078 symbol is double and the type of the LOC_LOCAL symbol is
1079 float). There are also LOC_ARG/LOC_REGISTER pairs which
1080 are not combined in symbol-reading. */
1082 sym2 = lookup_symbol (SYMBOL_NAME (sym),
1083 b, VAR_NAMESPACE, (int *)NULL, (struct symtab **)NULL);
1084 print_variable_value (sym2, fi, stream);
1085 fprintf_filtered (stream, "\n");
1089 /* Don't worry about things which aren't arguments. */
1094 if (!values_printed)
1096 fprintf_filtered (stream, "No arguments.\n");
1101 args_info (ignore, from_tty)
1105 if (!selected_frame)
1106 error ("No frame selected.");
1107 print_frame_arg_vars (selected_frame, gdb_stdout);
1110 /* Select frame FI, and note that its stack level is LEVEL.
1111 LEVEL may be -1 if an actual level number is not known. */
1114 select_frame (fi, level)
1115 struct frame_info *fi;
1118 register struct symtab *s;
1120 selected_frame = fi;
1121 selected_frame_level = level;
1123 /* Ensure that symbols for this frame are read in. Also, determine the
1124 source language of this frame, and switch to it if desired. */
1127 s = find_pc_symtab (fi->pc);
1129 && s->language != current_language->la_language
1130 && s->language != language_unknown
1131 && language_mode == language_mode_auto) {
1132 set_language(s->language);
1137 /* Store the selected frame and its level into *FRAMEP and *LEVELP.
1138 If there is no selected frame, *FRAMEP is set to NULL. */
1141 record_selected_frame (frameaddrp, levelp)
1142 CORE_ADDR *frameaddrp;
1145 *frameaddrp = selected_frame ? selected_frame->frame : 0;
1146 *levelp = selected_frame_level;
1149 /* Return the symbol-block in which the selected frame is executing.
1150 Can return zero under various legitimate circumstances. */
1153 get_selected_block ()
1155 if (!target_has_stack)
1158 if (!selected_frame)
1159 return get_current_block ();
1160 return get_frame_block (selected_frame);
1163 /* Find a frame a certain number of levels away from FRAME.
1164 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1165 Positive means go to earlier frames (up); negative, the reverse.
1166 The int that contains the number of levels is counted toward
1167 zero as the frames for those levels are found.
1168 If the top or bottom frame is reached, that frame is returned,
1169 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1170 how much farther the original request asked to go. */
1173 find_relative_frame (frame, level_offset_ptr)
1174 register struct frame_info *frame;
1175 register int *level_offset_ptr;
1177 register struct frame_info *prev;
1178 register struct frame_info *frame1;
1180 /* Going up is simple: just do get_prev_frame enough times
1181 or until initial frame is reached. */
1182 while (*level_offset_ptr > 0)
1184 prev = get_prev_frame (frame);
1187 (*level_offset_ptr)--;
1190 /* Going down is just as simple. */
1191 if (*level_offset_ptr < 0)
1193 while (*level_offset_ptr < 0) {
1194 frame1 = get_next_frame (frame);
1198 (*level_offset_ptr)++;
1204 /* The "select_frame" command. With no arg, NOP.
1205 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1206 valid level. Otherwise, treat level_exp as an address expression
1207 and select it. See parse_frame_specification for more info on proper
1208 frame expressions. */
1212 select_frame_command (level_exp, from_tty)
1216 register struct frame_info *frame, *frame1;
1217 unsigned int level = 0;
1219 if (!target_has_stack)
1220 error ("No stack.");
1222 frame = parse_frame_specification (level_exp);
1224 /* Try to figure out what level this frame is. But if there is
1225 no current stack, don't error out -- let the user set one. */
1227 if (get_current_frame()) {
1228 for (frame1 = get_prev_frame (0);
1229 frame1 && frame1 != frame;
1230 frame1 = get_prev_frame (frame1))
1237 select_frame (frame, level);
1240 /* The "frame" command. With no arg, print selected frame briefly.
1241 With arg, behaves like select_frame and then prints the selected
1245 frame_command (level_exp, from_tty)
1249 select_frame_command (level_exp, from_tty);
1250 print_stack_frame (selected_frame, selected_frame_level, 1);
1253 /* Select the frame up one or COUNT stack levels
1254 from the previously selected frame, and print it briefly. */
1258 up_silently_command (count_exp, from_tty)
1262 register struct frame_info *fi;
1263 int count = 1, count1;
1265 count = parse_and_eval_address (count_exp);
1268 if (target_has_stack == 0 || selected_frame == 0)
1269 error ("No stack.");
1271 fi = find_relative_frame (selected_frame, &count1);
1272 if (count1 != 0 && count_exp == 0)
1273 error ("Initial frame selected; you cannot go up.");
1274 select_frame (fi, selected_frame_level + count - count1);
1278 up_command (count_exp, from_tty)
1282 up_silently_command (count_exp, from_tty);
1283 print_stack_frame (selected_frame, selected_frame_level, 1);
1286 /* Select the frame down one or COUNT stack levels
1287 from the previously selected frame, and print it briefly. */
1291 down_silently_command (count_exp, from_tty)
1295 register struct frame_info *frame;
1296 int count = -1, count1;
1298 count = - parse_and_eval_address (count_exp);
1301 if (target_has_stack == 0 || selected_frame == 0)
1302 error ("No stack.");
1304 frame = find_relative_frame (selected_frame, &count1);
1305 if (count1 != 0 && count_exp == 0)
1308 /* We only do this if count_exp is not specified. That way "down"
1309 means to really go down (and let me know if that is
1310 impossible), but "down 9999" can be used to mean go all the way
1311 down without getting an error. */
1313 error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
1316 select_frame (frame, selected_frame_level + count - count1);
1321 down_command (count_exp, from_tty)
1325 down_silently_command (count_exp, from_tty);
1326 print_stack_frame (selected_frame, selected_frame_level, 1);
1330 return_command (retval_exp, from_tty)
1334 struct symbol *thisfun;
1335 CORE_ADDR selected_frame_addr;
1336 CORE_ADDR selected_frame_pc;
1337 struct frame_info *frame;
1338 value_ptr return_value = NULL;
1340 if (selected_frame == NULL)
1341 error ("No selected frame.");
1342 thisfun = get_frame_function (selected_frame);
1343 selected_frame_addr = FRAME_FP (selected_frame);
1344 selected_frame_pc = selected_frame->pc;
1346 /* Compute the return value (if any -- possibly getting errors here). */
1350 struct type *return_type = NULL;
1352 return_value = parse_and_eval (retval_exp);
1354 /* Cast return value to the return type of the function. */
1355 if (thisfun != NULL)
1356 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1357 if (return_type == NULL)
1358 return_type = builtin_type_int;
1359 return_value = value_cast (return_type, return_value);
1361 /* Make sure we have fully evaluated it, since
1362 it might live in the stack frame we're about to pop. */
1363 if (VALUE_LAZY (return_value))
1364 value_fetch_lazy (return_value);
1367 /* If interactive, require confirmation. */
1373 if (!query ("Make %s return now? ", SYMBOL_SOURCE_NAME (thisfun)))
1375 error ("Not confirmed.");
1380 if (!query ("Make selected stack frame return now? "))
1381 error ("Not confirmed.");
1384 /* Do the real work. Pop until the specified frame is current. We
1385 use this method because the selected_frame is not valid after
1386 a POP_FRAME. The pc comparison makes this work even if the
1387 selected frame shares its fp with another frame. */
1389 while (selected_frame_addr != (frame = get_current_frame())->frame
1390 || selected_frame_pc != frame->pc)
1393 /* Then pop that frame. */
1397 /* Compute the return value (if any) and store in the place
1398 for return values. */
1401 set_return_value (return_value);
1403 /* If interactive, print the frame that is now current. */
1406 frame_command ("0", 1);
1408 select_frame_command ("0", 0);
1411 /* Gets the language of the current frame. */
1414 get_frame_language()
1416 register struct symtab *s;
1417 enum language flang; /* The language of the current frame */
1421 s = find_pc_symtab(selected_frame->pc);
1423 flang = s->language;
1425 flang = language_unknown;
1428 flang = language_unknown;
1434 _initialize_stack ()
1437 backtrace_limit = 30;
1440 add_com ("return", class_stack, return_command,
1441 "Make selected stack frame return to its caller.\n\
1442 Control remains in the debugger, but when you continue\n\
1443 execution will resume in the frame above the one now selected.\n\
1444 If an argument is given, it is an expression for the value to return.");
1446 add_com ("up", class_stack, up_command,
1447 "Select and print stack frame that called this one.\n\
1448 An argument says how many frames up to go.");
1449 add_com ("up-silently", class_support, up_silently_command,
1450 "Same as the `up' command, but does not print anything.\n\
1451 This is useful in command scripts.");
1453 add_com ("down", class_stack, down_command,
1454 "Select and print stack frame called by this one.\n\
1455 An argument says how many frames down to go.");
1456 add_com_alias ("do", "down", class_stack, 1);
1457 add_com_alias ("dow", "down", class_stack, 1);
1458 add_com ("down-silently", class_support, down_silently_command,
1459 "Same as the `down' command, but does not print anything.\n\
1460 This is useful in command scripts.");
1462 add_com ("frame", class_stack, frame_command,
1463 "Select and print a stack frame.\n\
1464 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1465 An argument specifies the frame to select.\n\
1466 It can be a stack frame number or the address of the frame.\n\
1467 With argument, nothing is printed if input is coming from\n\
1468 a command file or a user-defined command.");
1470 add_com_alias ("f", "frame", class_stack, 1);
1472 add_com ("select-frame", class_stack, select_frame_command,
1473 "Select a stack frame without printing anything.\n\
1474 An argument specifies the frame to select.\n\
1475 It can be a stack frame number or the address of the frame.\n");
1477 add_com ("backtrace", class_stack, backtrace_command,
1478 "Print backtrace of all stack frames, or innermost COUNT frames.\n\
1479 With a negative argument, print outermost -COUNT frames.");
1480 add_com_alias ("bt", "backtrace", class_stack, 0);
1481 add_com_alias ("where", "backtrace", class_alias, 0);
1482 add_info ("stack", backtrace_command,
1483 "Backtrace of the stack, or innermost COUNT frames.");
1484 add_info_alias ("s", "stack", 1);
1485 add_info ("frame", frame_info,
1486 "All about selected stack frame, or frame at ADDR.");
1487 add_info_alias ("f", "frame", 1);
1488 add_info ("locals", locals_info,
1489 "Local variables of current stack frame.");
1490 add_info ("args", args_info,
1491 "Argument variables of current stack frame.");
1492 add_info ("catch", catch_info,
1493 "Exceptions that can be caught in the current stack frame.");
1496 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command,
1497 "Specify maximum number of frames for \"backtrace\" to print by default.",
1499 add_info ("backtrace-limit", backtrace_limit_info,
1500 "The maximum number of frames for \"backtrace\" to print by default.");