1 /* Print and select stack frames for GDB, the GNU debugger.
2 Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 #include "gdb_string.h"
26 #include "expression.h"
32 #include "breakpoint.h"
37 static void return_command
PARAMS ((char *, int));
39 static void down_command
PARAMS ((char *, int));
41 static void down_silently_command
PARAMS ((char *, int));
43 static void up_command
PARAMS ((char *, int));
45 static void up_silently_command
PARAMS ((char *, int));
47 static void frame_command
PARAMS ((char *, int));
49 static void select_frame_command
PARAMS ((char *, int));
51 static void args_info
PARAMS ((char *, int));
53 static void print_frame_arg_vars
PARAMS ((struct frame_info
*, GDB_FILE
*));
55 static void catch_info
PARAMS ((char *, int));
57 static void locals_info
PARAMS ((char *, int));
59 static void print_frame_label_vars
PARAMS ((struct frame_info
*, int,
62 static void print_frame_local_vars
PARAMS ((struct frame_info
*, GDB_FILE
*));
64 static int print_block_frame_labels
PARAMS ((struct block
*, int *,
67 static int print_block_frame_locals
PARAMS ((struct block
*,
71 static void backtrace_command
PARAMS ((char *, int));
73 static struct frame_info
*parse_frame_specification
PARAMS ((char *));
75 static void frame_info
PARAMS ((char *, int));
77 extern int addressprint
; /* Print addresses, or stay symbolic only? */
78 extern int info_verbose
; /* Verbosity of symbol reading msgs */
79 extern int lines_to_list
; /* # of lines "list" command shows by default */
81 /* The "selected" stack frame is used by default for local and arg access.
82 May be zero, for no selected frame. */
84 struct frame_info
*selected_frame
;
86 /* Level of the selected frame:
87 0 for innermost, 1 for its caller, ...
88 or -1 for frame specified by address with no defined level. */
90 int selected_frame_level
;
92 /* Zero means do things normally; we are interacting directly with the
93 user. One means print the full filename and linenumber when a
94 frame is printed, and do so in a format emacs18/emacs19.22 can
95 parse. Two means print similar annotations, but in many more
96 cases and in a slightly different syntax. */
98 int annotation_level
= 0;
101 struct print_stack_frame_args
{
102 struct frame_info
*fi
;
108 static int print_stack_frame_stub
PARAMS ((char *));
110 /* Pass the args the way catch_errors wants them. */
112 print_stack_frame_stub (args
)
115 struct print_stack_frame_args
*p
= (struct print_stack_frame_args
*)args
;
117 print_frame_info (p
->fi
, p
->level
, p
->source
, p
->args
);
121 /* Print a stack frame briefly. FRAME_INFI should be the frame info
122 and LEVEL should be its level in the stack (or -1 for level not defined).
123 This prints the level, the function executing, the arguments,
124 and the file name and line number.
125 If the pc is not at the beginning of the source line,
126 the actual pc is printed at the beginning.
128 If SOURCE is 1, print the source line as well.
129 If SOURCE is -1, print ONLY the source line. */
132 print_stack_frame (fi
, level
, source
)
133 struct frame_info
*fi
;
137 struct print_stack_frame_args args
;
141 args
.source
= source
;
144 catch_errors (print_stack_frame_stub
, (char *)&args
, "", RETURN_MASK_ERROR
);
147 struct print_args_args
{
149 struct frame_info
*fi
;
152 static int print_args_stub
PARAMS ((char *));
154 /* Pass the args the way catch_errors wants them. */
157 print_args_stub (args
)
161 struct print_args_args
*p
= (struct print_args_args
*)args
;
163 FRAME_NUM_ARGS (numargs
, (p
->fi
));
164 print_frame_args (p
->func
, p
->fi
, numargs
, gdb_stdout
);
168 /* LEVEL is the level of the frame, or -1 if it is the innermost frame
169 but we don't want to print the level. */
172 print_frame_info (fi
, level
, source
, args
)
173 struct frame_info
*fi
;
178 struct symtab_and_line sal
;
180 register char *funname
= 0;
181 enum language funlang
= language_unknown
;
184 char buf
[MAX_REGISTER_RAW_SIZE
];
187 /* On the 68k, this spends too much time in m68k_find_saved_regs. */
189 /* Get the value of SP_REGNUM relative to the frame. */
190 get_saved_register (buf
, (int *)NULL
, (CORE_ADDR
*)NULL
,
191 FRAME_INFO_ID (fi
), SP_REGNUM
, (enum lval_type
*)NULL
);
192 sp
= extract_address (buf
, REGISTER_RAW_SIZE (SP_REGNUM
));
194 /* This is not a perfect test, because if a function alloca's some
195 memory, puts some code there, and then jumps into it, then the test
196 will succeed even though there is no call dummy. Probably best is
197 to check for a bp_call_dummy breakpoint. */
198 if (PC_IN_CALL_DUMMY (fi
->pc
, sp
, fi
->frame
))
200 if (frame_in_dummy (fi
))
203 annotate_frame_begin (level
== -1 ? 0 : level
, fi
->pc
);
205 /* Do this regardless of SOURCE because we don't have any source
206 to list for this frame. */
208 printf_filtered ("#%-2d ", level
);
209 annotate_function_call ();
210 printf_filtered ("<function called from gdb>\n");
211 annotate_frame_end ();
214 if (fi
->signal_handler_caller
)
216 annotate_frame_begin (level
== -1 ? 0 : level
, fi
->pc
);
218 /* Do this regardless of SOURCE because we don't have any source
219 to list for this frame. */
221 printf_filtered ("#%-2d ", level
);
222 annotate_signal_handler_caller ();
223 printf_filtered ("<signal handler called>\n");
224 annotate_frame_end ();
228 /* If fi is not the innermost frame, that normally means that fi->pc
229 points to *after* the call instruction, and we want to get the line
230 containing the call, never the next line. But if the next frame is
231 a signal_handler_caller or a dummy frame, then the next frame was
232 not entered as the result of a call, and we want to get the line
233 containing fi->pc. */
235 find_pc_line (fi
->pc
,
237 && !fi
->next
->signal_handler_caller
238 && !frame_in_dummy (fi
->next
));
240 func
= find_pc_function (fi
->pc
);
243 /* In certain pathological cases, the symtabs give the wrong
244 function (when we are in the first function in a file which
245 is compiled without debugging symbols, the previous function
246 is compiled with debugging symbols, and the "foo.o" symbol
247 that is supposed to tell us where the file with debugging symbols
248 ends has been truncated by ar because it is longer than 15
249 characters). This also occurs if the user uses asm() to create
250 a function but not stabs for it (in a file compiled -g).
252 So look in the minimal symbol tables as well, and if it comes
253 up with a larger address for the function use that instead.
254 I don't think this can ever cause any problems; there shouldn't
255 be any minimal symbols in the middle of a function; if this is
256 ever changed many parts of GDB will need to be changed (and we'll
257 create a find_pc_minimal_function or some such). */
259 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (fi
->pc
);
261 && (SYMBOL_VALUE_ADDRESS (msymbol
)
262 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
265 /* There is no particular reason to think the line number
266 information is wrong. Someone might have just put in
267 a label with asm() but left the line numbers alone. */
268 /* In this case we have no way of knowing the source file
269 and line number, so don't print them. */
272 /* We also don't know anything about the function besides
273 its address and name. */
275 funname
= SYMBOL_NAME (msymbol
);
276 funlang
= SYMBOL_LANGUAGE (msymbol
);
280 funname
= SYMBOL_NAME (func
);
281 funlang
= SYMBOL_LANGUAGE (func
);
286 register struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (fi
->pc
);
289 funname
= SYMBOL_NAME (msymbol
);
290 funlang
= SYMBOL_LANGUAGE (msymbol
);
294 if (source
>= 0 || !sal
.symtab
)
296 annotate_frame_begin (level
== -1 ? 0 : level
, fi
->pc
);
299 printf_filtered ("#%-2d ", level
);
301 if (fi
->pc
!= sal
.pc
|| !sal
.symtab
)
303 annotate_frame_address ();
304 print_address_numeric (fi
->pc
, 1, gdb_stdout
);
305 annotate_frame_address_end ();
306 printf_filtered (" in ");
308 annotate_frame_function_name ();
309 fprintf_symbol_filtered (gdb_stdout
, funname
? funname
: "??", funlang
,
312 annotate_frame_args ();
313 fputs_filtered (" (", gdb_stdout
);
316 struct print_args_args args
;
319 catch_errors (print_args_stub
, (char *)&args
, "", RETURN_MASK_ERROR
);
321 printf_filtered (")");
322 if (sal
.symtab
&& sal
.symtab
->filename
)
324 annotate_frame_source_begin ();
326 printf_filtered (" at ");
327 annotate_frame_source_file ();
328 printf_filtered ("%s", sal
.symtab
->filename
);
329 annotate_frame_source_file_end ();
330 printf_filtered (":");
331 annotate_frame_source_line ();
332 printf_filtered ("%d", sal
.line
);
333 annotate_frame_source_end ();
336 #ifdef PC_LOAD_SEGMENT
337 /* If we couldn't print out function name but if can figure out what
338 load segment this pc value is from, at least print out some info
339 about its load segment. */
342 annotate_frame_where ();
344 printf_filtered (" from %s", PC_LOAD_SEGMENT (fi
->pc
));
347 printf_filtered ("\n");
350 if ((source
!= 0) && sal
.symtab
)
353 int mid_statement
= source
< 0 && fi
->pc
!= sal
.pc
;
354 if (annotation_level
)
355 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
359 if (addressprint
&& mid_statement
)
361 print_address_numeric (fi
->pc
, 1, gdb_stdout
);
362 printf_filtered ("\t");
364 if (print_frame_info_listing_hook
)
365 print_frame_info_listing_hook (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
367 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
369 current_source_line
= max (sal
.line
- lines_to_list
/2, 1);
372 set_default_breakpoint (1, fi
->pc
, sal
.symtab
, sal
.line
);
374 annotate_frame_end ();
376 gdb_flush (gdb_stdout
);
379 /* Read a frame specification in whatever the appropriate format is.
380 Call error() if the specification is in any way invalid (i.e.
381 this function never returns NULL). */
383 static struct frame_info
*
384 parse_frame_specification (frame_exp
)
389 CORE_ADDR args
[MAXARGS
];
393 char *addr_string
, *p
;
394 struct cleanup
*tmp_cleanup
;
396 while (*frame_exp
== ' ') frame_exp
++;
400 if (numargs
> MAXARGS
)
401 error ("Too many args in frame specification");
402 /* Parse an argument. */
403 for (p
= frame_exp
; *p
&& *p
!= ' '; p
++)
405 addr_string
= savestring(frame_exp
, p
- frame_exp
);
408 tmp_cleanup
= make_cleanup (free
, addr_string
);
409 args
[numargs
++] = parse_and_eval_address (addr_string
);
410 do_cleanups (tmp_cleanup
);
413 /* Skip spaces, move to possible next arg. */
414 while (*p
== ' ') p
++;
422 if (selected_frame
== NULL
)
423 error ("No selected frame.");
424 return selected_frame
;
429 struct frame_info
*fid
=
430 find_relative_frame (get_current_frame (), &level
);
431 struct frame_info
*tfid
;
434 /* find_relative_frame was successful */
437 /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications
438 take at least 2 addresses. It is important to detect this case
439 here so that "frame 100" does not give a confusing error message
440 like "frame specification requires two addresses". This of course
441 does not solve the "frame 100" problem for machines on which
442 a frame specification can be made with one address. To solve
443 that, we need a new syntax for a specifying a frame by address.
444 I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for
445 two args, etc.), but people might think that is too much typing,
446 so I guess *0x23,0x45 would be a possible alternative (commas
447 really should be used instead of spaces to delimit; using spaces
448 normally works in an expression). */
449 #ifdef SETUP_ARBITRARY_FRAME
450 error ("No frame %d", args
[0]);
453 /* If (s)he specifies the frame with an address, he deserves what
454 (s)he gets. Still, give the highest one that matches. */
456 for (fid
= get_current_frame ();
457 fid
&& fid
->frame
!= args
[0];
458 fid
= get_prev_frame (fid
))
462 while ((tfid
= get_prev_frame (fid
)) &&
463 (tfid
->frame
== args
[0]))
466 /* We couldn't identify the frame as an existing frame, but
467 perhaps we can create one with a single argument. */
471 #ifdef SETUP_ARBITRARY_FRAME
472 return SETUP_ARBITRARY_FRAME (numargs
, args
);
474 /* Usual case. Do it here rather than have everyone supply
475 a SETUP_ARBITRARY_FRAME that does this. */
477 return create_new_frame (args
[0], 0);
478 error ("Too many args in frame specification");
485 /* FRAME_ARGS_ADDRESS_CORRECT is just like FRAME_ARGS_ADDRESS except
486 that if it is unsure about the answer, it returns 0
487 instead of guessing (this happens on the VAX and i960, for example).
489 On most machines, we never have to guess about the args address,
490 so FRAME_ARGS_ADDRESS{,_CORRECT} are the same. */
491 #if !defined (FRAME_ARGS_ADDRESS_CORRECT)
492 #define FRAME_ARGS_ADDRESS_CORRECT FRAME_ARGS_ADDRESS
495 /* Print verbosely the selected frame or the frame at address ADDR.
496 This means absolutely all information in the frame is printed. */
499 frame_info (addr_exp
, from_tty
)
503 struct frame_info
*fi
;
504 struct frame_saved_regs fsr
;
505 struct symtab_and_line sal
;
508 struct frame_info
*calling_frame_info
;
509 int i
, count
, numregs
;
511 enum language funlang
= language_unknown
;
513 if (!target_has_stack
)
516 fi
= parse_frame_specification (addr_exp
);
518 error ("Invalid frame specified.");
520 sal
= find_pc_line (fi
->pc
,
522 && !fi
->next
->signal_handler_caller
523 && !frame_in_dummy (fi
->next
));
524 func
= get_frame_function (fi
);
525 s
= find_pc_symtab(fi
->pc
);
528 funname
= SYMBOL_NAME (func
);
529 funlang
= SYMBOL_LANGUAGE (func
);
533 register struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (fi
->pc
);
536 funname
= SYMBOL_NAME (msymbol
);
537 funlang
= SYMBOL_LANGUAGE (msymbol
);
540 calling_frame_info
= get_prev_frame (fi
);
542 if (!addr_exp
&& selected_frame_level
>= 0)
544 printf_filtered ("Stack level %d, frame at ", selected_frame_level
);
545 print_address_numeric (fi
->frame
, 1, gdb_stdout
);
546 printf_filtered (":\n");
550 printf_filtered ("Stack frame at ");
551 print_address_numeric (fi
->frame
, 1, gdb_stdout
);
552 printf_filtered (":\n");
554 printf_filtered (" %s = ", reg_names
[PC_REGNUM
]);
555 print_address_numeric (fi
->pc
, 1, gdb_stdout
);
560 printf_filtered (" in ");
561 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
562 DMGL_ANSI
| DMGL_PARAMS
);
566 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
567 puts_filtered ("; ");
569 printf_filtered ("saved %s ", reg_names
[PC_REGNUM
]);
570 print_address_numeric (FRAME_SAVED_PC (fi
), 1, gdb_stdout
);
571 printf_filtered ("\n");
575 #ifdef FRAMELESS_FUNCTION_INVOCATION
576 FRAMELESS_FUNCTION_INVOCATION (fi
, frameless
);
579 printf_filtered (" (FRAMELESS),");
582 if (calling_frame_info
)
584 printf_filtered (" called by frame at ");
585 print_address_numeric (calling_frame_info
->frame
, 1, gdb_stdout
);
587 if (fi
->next
&& calling_frame_info
)
592 printf_filtered (" caller of frame at ");
593 print_address_numeric (fi
->next
->frame
, 1, gdb_stdout
);
595 if (fi
->next
|| calling_frame_info
)
596 puts_filtered ("\n");
598 printf_filtered (" source language %s.\n", language_str (s
->language
));
600 #ifdef PRINT_EXTRA_FRAME_INFO
601 PRINT_EXTRA_FRAME_INFO (fi
);
605 /* Address of the argument list for this frame, or 0. */
606 CORE_ADDR arg_list
= FRAME_ARGS_ADDRESS_CORRECT (fi
);
607 /* Number of args for this frame, or -1 if unknown. */
611 printf_filtered (" Arglist at unknown address.\n");
614 printf_filtered (" Arglist at ");
615 print_address_numeric (arg_list
, 1, gdb_stdout
);
616 printf_filtered (",");
618 FRAME_NUM_ARGS (numargs
, fi
);
620 puts_filtered (" args: ");
621 else if (numargs
== 0)
622 puts_filtered (" no args.");
623 else if (numargs
== 1)
624 puts_filtered (" 1 arg: ");
626 printf_filtered (" %d args: ", numargs
);
627 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
628 puts_filtered ("\n");
632 /* Address of the local variables for this frame, or 0. */
633 CORE_ADDR arg_list
= FRAME_LOCALS_ADDRESS (fi
);
636 printf_filtered (" Locals at unknown address,");
639 printf_filtered (" Locals at ");
640 print_address_numeric (arg_list
, 1, gdb_stdout
);
641 printf_filtered (",");
645 #if defined (FRAME_FIND_SAVED_REGS)
646 get_frame_saved_regs (fi
, &fsr
);
647 /* The sp is special; what's returned isn't the save address, but
648 actually the value of the previous frame's sp. */
649 printf_filtered (" Previous frame's sp is ");
650 print_address_numeric (fsr
.regs
[SP_REGNUM
], 1, gdb_stdout
);
651 printf_filtered ("\n");
653 numregs
= ARCH_NUM_REGS
;
654 for (i
= 0; i
< numregs
; i
++)
655 if (fsr
.regs
[i
] && i
!= SP_REGNUM
)
658 puts_filtered (" Saved registers:\n ");
662 printf_filtered (" %s at ", reg_names
[i
]);
663 print_address_numeric (fsr
.regs
[i
], 1, gdb_stdout
);
667 puts_filtered ("\n");
668 #else /* Have FRAME_FIND_SAVED_REGS. */
669 /* We could get some information about saved registers by calling
670 get_saved_register on each register. Which info goes with which frame
671 is necessarily lost, however, and I suspect that the users don't care
672 whether they get the info. */
673 puts_filtered ("\n");
674 #endif /* Have FRAME_FIND_SAVED_REGS. */
678 /* Set a limit on the number of frames printed by default in a
681 static int backtrace_limit
;
684 set_backtrace_limit_command (count_exp
, from_tty
)
688 int count
= parse_and_eval_address (count_exp
);
691 error ("Negative argument not meaningful as backtrace limit.");
693 backtrace_limit
= count
;
697 backtrace_limit_info (arg
, from_tty
)
702 error ("\"Info backtrace-limit\" takes no arguments.");
704 printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit
);
708 /* Print briefly all stack frames or just the innermost COUNT frames. */
711 backtrace_command (count_exp
, from_tty
)
715 struct frame_info
*fi
;
718 register struct frame_info
*trailing
;
719 register int trailing_level
;
721 if (!target_has_stack
)
724 /* The following code must do two things. First, it must
725 set the variable TRAILING to the frame from which we should start
726 printing. Second, it must set the variable count to the number
727 of frames which we should print, or -1 if all of them. */
728 trailing
= get_current_frame ();
732 count
= parse_and_eval_address (count_exp
);
735 struct frame_info
*current
;
740 while (current
&& count
--)
743 current
= get_prev_frame (current
);
746 /* Will stop when CURRENT reaches the top of the stack. TRAILING
747 will be COUNT below it. */
751 trailing
= get_prev_frame (trailing
);
752 current
= get_prev_frame (current
);
764 struct partial_symtab
*ps
;
766 /* Read in symbols for all of the frames. Need to do this in
767 a separate pass so that "Reading in symbols for xxx" messages
768 don't screw up the appearance of the backtrace. Also
769 if people have strong opinions against reading symbols for
770 backtrace this may have to be an option. */
774 fi
= get_prev_frame (fi
))
777 ps
= find_pc_psymtab (fi
->pc
);
779 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in */
783 for (i
= 0, fi
= trailing
;
785 i
++, fi
= get_prev_frame (fi
))
789 /* Don't use print_stack_frame; if an error() occurs it probably
790 means further attempts to backtrace would fail (on the other
791 hand, perhaps the code does or could be fixed to make sure
792 the frame->prev field gets set to NULL in that case). */
793 print_frame_info (fi
, trailing_level
+ i
, 0, 1);
796 /* If we've stopped before the end, mention that. */
798 printf_filtered ("(More stack frames follow...)\n");
801 /* Print the local variables of a block B active in FRAME.
802 Return 1 if any variables were printed; 0 otherwise. */
805 print_block_frame_locals (b
, fi
, stream
)
807 register struct frame_info
*fi
;
808 register GDB_FILE
*stream
;
812 register struct symbol
*sym
;
813 register int values_printed
= 0;
815 nsyms
= BLOCK_NSYMS (b
);
817 for (i
= 0; i
< nsyms
; i
++)
819 sym
= BLOCK_SYM (b
, i
);
820 switch (SYMBOL_CLASS (sym
))
827 fputs_filtered (SYMBOL_SOURCE_NAME (sym
), stream
);
828 fputs_filtered (" = ", stream
);
829 print_variable_value (sym
, fi
, stream
);
830 fprintf_filtered (stream
, "\n");
834 /* Ignore symbols which are not locals. */
838 return values_printed
;
841 /* Same, but print labels. */
844 print_block_frame_labels (b
, have_default
, stream
)
847 register GDB_FILE
*stream
;
851 register struct symbol
*sym
;
852 register int values_printed
= 0;
854 nsyms
= BLOCK_NSYMS (b
);
856 for (i
= 0; i
< nsyms
; i
++)
858 sym
= BLOCK_SYM (b
, i
);
859 if (STREQ (SYMBOL_NAME (sym
), "default"))
865 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
867 struct symtab_and_line sal
;
868 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
870 fputs_filtered (SYMBOL_SOURCE_NAME (sym
), stream
);
873 fprintf_filtered (stream
, " ");
874 print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
876 fprintf_filtered (stream
, " in file %s, line %d\n",
877 sal
.symtab
->filename
, sal
.line
);
880 return values_printed
;
883 /* Print on STREAM all the local variables in frame FRAME,
884 including all the blocks active in that frame
887 Returns 1 if the job was done,
888 or 0 if nothing was printed because we have no info
889 on the function running in FRAME. */
892 print_frame_local_vars (fi
, stream
)
893 register struct frame_info
*fi
;
894 register GDB_FILE
*stream
;
896 register struct block
*block
= get_frame_block (fi
);
897 register int values_printed
= 0;
901 fprintf_filtered (stream
, "No symbol table info available.\n");
907 if (print_block_frame_locals (block
, fi
, stream
))
909 /* After handling the function's top-level block, stop.
910 Don't continue to its superblock, the block of
912 if (BLOCK_FUNCTION (block
))
914 block
= BLOCK_SUPERBLOCK (block
);
919 fprintf_filtered (stream
, "No locals.\n");
923 /* Same, but print labels. */
926 print_frame_label_vars (fi
, this_level_only
, stream
)
927 register struct frame_info
*fi
;
929 register GDB_FILE
*stream
;
931 register struct blockvector
*bl
;
932 register struct block
*block
= get_frame_block (fi
);
933 register int values_printed
= 0;
934 int index
, have_default
= 0;
935 char *blocks_printed
;
936 CORE_ADDR pc
= fi
->pc
;
940 fprintf_filtered (stream
, "No symbol table info available.\n");
944 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
945 blocks_printed
= (char *) alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
946 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
950 CORE_ADDR end
= BLOCK_END (block
) - 4;
953 if (bl
!= blockvector_for_pc (end
, &index
))
954 error ("blockvector blotch");
955 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
956 error ("blockvector botch");
957 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
960 /* Don't print out blocks that have gone by. */
961 while (index
< last_index
962 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
965 while (index
< last_index
966 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
968 if (blocks_printed
[index
] == 0)
970 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
), &have_default
, stream
))
972 blocks_printed
[index
] = 1;
978 if (values_printed
&& this_level_only
)
981 /* After handling the function's top-level block, stop.
982 Don't continue to its superblock, the block of
984 if (BLOCK_FUNCTION (block
))
986 block
= BLOCK_SUPERBLOCK (block
);
989 if (!values_printed
&& !this_level_only
)
991 fprintf_filtered (stream
, "No catches.\n");
997 locals_info (args
, from_tty
)
1001 if (!selected_frame
)
1002 error ("No frame selected.");
1003 print_frame_local_vars (selected_frame
, gdb_stdout
);
1007 catch_info (ignore
, from_tty
)
1011 if (!selected_frame
)
1012 error ("No frame selected.");
1013 print_frame_label_vars (selected_frame
, 0, gdb_stdout
);
1017 print_frame_arg_vars (fi
, stream
)
1018 register struct frame_info
*fi
;
1019 register GDB_FILE
*stream
;
1021 struct symbol
*func
= get_frame_function (fi
);
1022 register struct block
*b
;
1025 register struct symbol
*sym
, *sym2
;
1026 register int values_printed
= 0;
1030 fprintf_filtered (stream
, "No symbol table info available.\n");
1034 b
= SYMBOL_BLOCK_VALUE (func
);
1035 nsyms
= BLOCK_NSYMS (b
);
1037 for (i
= 0; i
< nsyms
; i
++)
1039 sym
= BLOCK_SYM (b
, i
);
1040 switch (SYMBOL_CLASS (sym
))
1046 case LOC_REGPARM_ADDR
:
1047 case LOC_BASEREG_ARG
:
1049 fputs_filtered (SYMBOL_SOURCE_NAME (sym
), stream
);
1050 fputs_filtered (" = ", stream
);
1052 /* We have to look up the symbol because arguments can have
1053 two entries (one a parameter, one a local) and the one we
1054 want is the local, which lookup_symbol will find for us.
1055 This includes gcc1 (not gcc2) on the sparc when passing a
1056 small structure and gcc2 when the argument type is float
1057 and it is passed as a double and converted to float by
1058 the prologue (in the latter case the type of the LOC_ARG
1059 symbol is double and the type of the LOC_LOCAL symbol is
1060 float). There are also LOC_ARG/LOC_REGISTER pairs which
1061 are not combined in symbol-reading. */
1063 sym2
= lookup_symbol (SYMBOL_NAME (sym
),
1064 b
, VAR_NAMESPACE
, (int *)NULL
, (struct symtab
**)NULL
);
1065 print_variable_value (sym2
, fi
, stream
);
1066 fprintf_filtered (stream
, "\n");
1070 /* Don't worry about things which aren't arguments. */
1075 if (!values_printed
)
1077 fprintf_filtered (stream
, "No arguments.\n");
1082 args_info (ignore
, from_tty
)
1086 if (!selected_frame
)
1087 error ("No frame selected.");
1088 print_frame_arg_vars (selected_frame
, gdb_stdout
);
1091 /* Select frame FI, and note that its stack level is LEVEL.
1092 LEVEL may be -1 if an actual level number is not known. */
1095 select_frame (fi
, level
)
1096 struct frame_info
*fi
;
1099 register struct symtab
*s
;
1101 selected_frame
= fi
;
1102 selected_frame_level
= level
;
1104 /* Ensure that symbols for this frame are read in. Also, determine the
1105 source language of this frame, and switch to it if desired. */
1108 s
= find_pc_symtab (fi
->pc
);
1110 && s
->language
!= current_language
->la_language
1111 && s
->language
!= language_unknown
1112 && language_mode
== language_mode_auto
) {
1113 set_language(s
->language
);
1118 /* Store the selected frame and its level into *FRAMEP and *LEVELP.
1119 If there is no selected frame, *FRAMEP is set to NULL. */
1122 record_selected_frame (frameaddrp
, levelp
)
1123 CORE_ADDR
*frameaddrp
;
1126 *frameaddrp
= selected_frame
? selected_frame
->frame
: 0;
1127 *levelp
= selected_frame_level
;
1130 /* Return the symbol-block in which the selected frame is executing.
1131 Can return zero under various legitimate circumstances. */
1134 get_selected_block ()
1136 if (!target_has_stack
)
1139 if (!selected_frame
)
1140 return get_current_block ();
1141 return get_frame_block (selected_frame
);
1144 /* Find a frame a certain number of levels away from FRAME.
1145 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1146 Positive means go to earlier frames (up); negative, the reverse.
1147 The int that contains the number of levels is counted toward
1148 zero as the frames for those levels are found.
1149 If the top or bottom frame is reached, that frame is returned,
1150 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1151 how much farther the original request asked to go. */
1154 find_relative_frame (frame
, level_offset_ptr
)
1155 register struct frame_info
*frame
;
1156 register int *level_offset_ptr
;
1158 register struct frame_info
*prev
;
1159 register struct frame_info
*frame1
;
1161 /* Going up is simple: just do get_prev_frame enough times
1162 or until initial frame is reached. */
1163 while (*level_offset_ptr
> 0)
1165 prev
= get_prev_frame (frame
);
1168 (*level_offset_ptr
)--;
1171 /* Going down is just as simple. */
1172 if (*level_offset_ptr
< 0)
1174 while (*level_offset_ptr
< 0) {
1175 frame1
= get_next_frame (frame
);
1179 (*level_offset_ptr
)++;
1185 /* The "select_frame" command. With no arg, NOP.
1186 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1187 valid level. Otherwise, treat level_exp as an address expression
1188 and select it. See parse_frame_specification for more info on proper
1189 frame expressions. */
1193 select_frame_command (level_exp
, from_tty
)
1197 register struct frame_info
*frame
, *frame1
;
1198 unsigned int level
= 0;
1200 if (!target_has_stack
)
1201 error ("No stack.");
1203 frame
= parse_frame_specification (level_exp
);
1205 /* Try to figure out what level this frame is. But if there is
1206 no current stack, don't error out -- let the user set one. */
1208 if (get_current_frame()) {
1209 for (frame1
= get_prev_frame (0);
1210 frame1
&& frame1
!= frame
;
1211 frame1
= get_prev_frame (frame1
))
1218 select_frame (frame
, level
);
1221 /* The "frame" command. With no arg, print selected frame briefly.
1222 With arg, behaves like select_frame and then prints the selected
1226 frame_command (level_exp
, from_tty
)
1230 select_frame_command (level_exp
, from_tty
);
1231 print_stack_frame (selected_frame
, selected_frame_level
, 1);
1234 /* Select the frame up one or COUNT stack levels
1235 from the previously selected frame, and print it briefly. */
1239 up_silently_command (count_exp
, from_tty
)
1243 register struct frame_info
*fi
;
1244 int count
= 1, count1
;
1246 count
= parse_and_eval_address (count_exp
);
1249 if (target_has_stack
== 0 || selected_frame
== 0)
1250 error ("No stack.");
1252 fi
= find_relative_frame (selected_frame
, &count1
);
1253 if (count1
!= 0 && count_exp
== 0)
1254 error ("Initial frame selected; you cannot go up.");
1255 select_frame (fi
, selected_frame_level
+ count
- count1
);
1259 up_command (count_exp
, from_tty
)
1263 up_silently_command (count_exp
, from_tty
);
1264 print_stack_frame (selected_frame
, selected_frame_level
, 1);
1267 /* Select the frame down one or COUNT stack levels
1268 from the previously selected frame, and print it briefly. */
1272 down_silently_command (count_exp
, from_tty
)
1276 register struct frame_info
*frame
;
1277 int count
= -1, count1
;
1279 count
= - parse_and_eval_address (count_exp
);
1282 if (target_has_stack
== 0 || selected_frame
== 0)
1283 error ("No stack.");
1285 frame
= find_relative_frame (selected_frame
, &count1
);
1286 if (count1
!= 0 && count_exp
== 0)
1289 /* We only do this if count_exp is not specified. That way "down"
1290 means to really go down (and let me know if that is
1291 impossible), but "down 9999" can be used to mean go all the way
1292 down without getting an error. */
1294 error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
1297 select_frame (frame
, selected_frame_level
+ count
- count1
);
1302 down_command (count_exp
, from_tty
)
1306 down_silently_command (count_exp
, from_tty
);
1307 print_stack_frame (selected_frame
, selected_frame_level
, 1);
1311 return_command (retval_exp
, from_tty
)
1315 struct symbol
*thisfun
;
1316 CORE_ADDR selected_frame_addr
;
1317 CORE_ADDR selected_frame_pc
;
1318 struct frame_info
*frame
;
1319 value_ptr return_value
= NULL
;
1321 if (selected_frame
== NULL
)
1322 error ("No selected frame.");
1323 thisfun
= get_frame_function (selected_frame
);
1324 selected_frame_addr
= FRAME_FP (selected_frame
);
1325 selected_frame_pc
= selected_frame
->pc
;
1327 /* Compute the return value (if any -- possibly getting errors here). */
1331 struct type
*return_type
= NULL
;
1333 return_value
= parse_and_eval (retval_exp
);
1335 /* Cast return value to the return type of the function. */
1336 if (thisfun
!= NULL
)
1337 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1338 if (return_type
== NULL
)
1339 return_type
= builtin_type_int
;
1340 return_value
= value_cast (return_type
, return_value
);
1342 /* Make sure we have fully evaluated it, since
1343 it might live in the stack frame we're about to pop. */
1344 if (VALUE_LAZY (return_value
))
1345 value_fetch_lazy (return_value
);
1348 /* If interactive, require confirmation. */
1354 if (!query ("Make %s return now? ", SYMBOL_SOURCE_NAME (thisfun
)))
1356 error ("Not confirmed.");
1361 if (!query ("Make selected stack frame return now? "))
1362 error ("Not confirmed.");
1365 /* Do the real work. Pop until the specified frame is current. We
1366 use this method because the selected_frame is not valid after
1367 a POP_FRAME. The pc comparison makes this work even if the
1368 selected frame shares its fp with another frame. */
1370 while (selected_frame_addr
!= (frame
= get_current_frame())->frame
1371 || selected_frame_pc
!= frame
->pc
)
1374 /* Then pop that frame. */
1378 /* Compute the return value (if any) and store in the place
1379 for return values. */
1382 set_return_value (return_value
);
1384 /* If interactive, print the frame that is now current. */
1387 frame_command ("0", 1);
1390 /* Gets the language of the current frame. */
1393 get_frame_language()
1395 register struct symtab
*s
;
1396 enum language flang
; /* The language of the current frame */
1400 s
= find_pc_symtab(selected_frame
->pc
);
1402 flang
= s
->language
;
1404 flang
= language_unknown
;
1407 flang
= language_unknown
;
1413 _initialize_stack ()
1416 backtrace_limit
= 30;
1419 add_com ("return", class_stack
, return_command
,
1420 "Make selected stack frame return to its caller.\n\
1421 Control remains in the debugger, but when you continue\n\
1422 execution will resume in the frame above the one now selected.\n\
1423 If an argument is given, it is an expression for the value to return.");
1425 add_com ("up", class_stack
, up_command
,
1426 "Select and print stack frame that called this one.\n\
1427 An argument says how many frames up to go.");
1428 add_com ("up-silently", class_support
, up_silently_command
,
1429 "Same as the `up' command, but does not print anything.\n\
1430 This is useful in command scripts.");
1432 add_com ("down", class_stack
, down_command
,
1433 "Select and print stack frame called by this one.\n\
1434 An argument says how many frames down to go.");
1435 add_com_alias ("do", "down", class_stack
, 1);
1436 add_com_alias ("dow", "down", class_stack
, 1);
1437 add_com ("down-silently", class_support
, down_silently_command
,
1438 "Same as the `down' command, but does not print anything.\n\
1439 This is useful in command scripts.");
1441 add_com ("frame", class_stack
, frame_command
,
1442 "Select and print a stack frame.\n\
1443 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1444 An argument specifies the frame to select.\n\
1445 It can be a stack frame number or the address of the frame.\n\
1446 With argument, nothing is printed if input is coming from\n\
1447 a command file or a user-defined command.");
1449 add_com_alias ("f", "frame", class_stack
, 1);
1451 add_com ("select-frame", class_stack
, select_frame_command
,
1452 "Select a stack frame without printing anything.\n\
1453 An argument specifies the frame to select.\n\
1454 It can be a stack frame number or the address of the frame.\n");
1456 add_com ("backtrace", class_stack
, backtrace_command
,
1457 "Print backtrace of all stack frames, or innermost COUNT frames.\n\
1458 With a negative argument, print outermost -COUNT frames.");
1459 add_com_alias ("bt", "backtrace", class_stack
, 0);
1460 add_com_alias ("where", "backtrace", class_alias
, 0);
1461 add_info ("stack", backtrace_command
,
1462 "Backtrace of the stack, or innermost COUNT frames.");
1463 add_info_alias ("s", "stack", 1);
1464 add_info ("frame", frame_info
,
1465 "All about selected stack frame, or frame at ADDR.");
1466 add_info_alias ("f", "frame", 1);
1467 add_info ("locals", locals_info
,
1468 "Local variables of current stack frame.");
1469 add_info ("args", args_info
,
1470 "Argument variables of current stack frame.");
1471 add_info ("catch", catch_info
,
1472 "Exceptions that can be caught in the current stack frame.");
1475 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
,
1476 "Specify maximum number of frames for \"backtrace\" to print by default.",
1478 add_info ("backtrace-limit", backtrace_limit_info
,
1479 "The maximum number of frames for \"backtrace\" to print by default.");