1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
30 #include "expression.h"
37 #include "breakpoint.h"
44 #include "gdb_assert.h"
45 #include "dictionary.h"
46 #include "exceptions.h"
47 #include "reggroups.h"
51 /* Prototypes for exported functions. */
53 void args_info (char *, int);
55 void locals_info (char *, int);
57 void (*deprecated_selected_frame_level_changed_hook
) (int);
59 void _initialize_stack (void);
61 /* Prototypes for local functions. */
63 static struct frame_info
*parse_frame_specification (char *frame_exp
);
65 static void down_command (char *, int);
67 static void down_silently_base (char *);
69 static void down_silently_command (char *, int);
71 static void up_command (char *, int);
73 static void up_silently_base (char *);
75 static void up_silently_command (char *, int);
77 void frame_command (char *, int);
79 static void current_frame_command (char *, int);
81 static void print_frame_arg_vars (struct frame_info
*, struct ui_file
*);
83 static void catch_info (char *, int);
85 static void args_plus_locals_info (char *, int);
87 static void print_frame_label_vars (struct frame_info
*, int,
90 static void print_frame_local_vars (struct frame_info
*, int,
93 static int print_block_frame_labels (struct block
*, int *,
96 static int print_block_frame_locals (struct block
*,
101 static void print_frame (struct frame_info
*fi
,
103 enum print_what print_what
,
105 struct symtab_and_line sal
);
107 static void set_current_sal_from_frame (struct frame_info
*, int);
109 static void backtrace_command (char *, int);
111 static void frame_info (char *, int);
113 extern int addressprint
; /* Print addresses, or stay symbolic only? */
115 /* Zero means do things normally; we are interacting directly with the
116 user. One means print the full filename and linenumber when a
117 frame is printed, and do so in a format emacs18/emacs19.22 can
118 parse. Two means print similar annotations, but in many more
119 cases and in a slightly different syntax. */
121 int annotation_level
= 0;
124 struct print_stack_frame_args
126 struct frame_info
*fi
;
128 enum print_what print_what
;
132 /* Show or print the frame arguments.
133 Pass the args the way catch_errors wants them. */
135 print_stack_frame_stub (void *args
)
137 struct print_stack_frame_args
*p
= args
;
138 int center
= (p
->print_what
== SRC_LINE
139 || p
->print_what
== SRC_AND_LOC
);
141 print_frame_info (p
->fi
, p
->print_level
, p
->print_what
, p
->print_args
);
142 set_current_sal_from_frame (p
->fi
, center
);
146 /* Show or print a stack frame FI briefly. The output is format
147 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
148 relative level, function name, argument list, and file name and
149 line number. If the frame's PC is not at the beginning of the
150 source line, the actual PC is printed at the beginning. */
153 print_stack_frame (struct frame_info
*fi
, int print_level
,
154 enum print_what print_what
)
156 struct print_stack_frame_args args
;
159 args
.print_level
= print_level
;
160 args
.print_what
= print_what
;
163 catch_errors (print_stack_frame_stub
, (char *) &args
, "", RETURN_MASK_ALL
);
166 struct print_args_args
169 struct frame_info
*fi
;
170 struct ui_file
*stream
;
173 static int print_args_stub (void *);
175 /* Print nameless args on STREAM.
176 FI is the frameinfo for this frame, START is the offset
177 of the first nameless arg, and NUM is the number of nameless args to
178 print. FIRST is nonzero if this is the first argument (not just
179 the first nameless arg). */
182 print_frame_nameless_args (struct frame_info
*fi
, long start
, int num
,
183 int first
, struct ui_file
*stream
)
189 for (i
= 0; i
< num
; i
++)
192 argsaddr
= get_frame_args_address (fi
);
195 arg_value
= read_memory_integer (argsaddr
+ start
, sizeof (int));
197 fprintf_filtered (stream
, ", ");
198 fprintf_filtered (stream
, "%ld", arg_value
);
200 start
+= sizeof (int);
204 /* Print the arguments of a stack frame, given the function FUNC
205 running in that frame (as a symbol), the info on the frame,
206 and the number of args according to the stack frame (or -1 if unknown). */
208 /* References here and elsewhere to "number of args according to the
209 stack frame" appear in all cases to refer to "number of ints of args
210 according to the stack frame". At least for VAX, i386, isi. */
213 print_frame_args (struct symbol
*func
, struct frame_info
*fi
, int num
,
214 struct ui_file
*stream
)
216 struct block
*b
= NULL
;
218 struct dict_iterator iter
;
221 /* Offset of next stack argument beyond the one we have seen that is
222 at the highest offset.
223 -1 if we haven't come to a stack argument yet. */
224 long highest_offset
= -1;
226 /* Number of ints of arguments that we have printed so far. */
227 int args_printed
= 0;
228 struct cleanup
*old_chain
, *list_chain
;
229 struct ui_stream
*stb
;
231 stb
= ui_out_stream_new (uiout
);
232 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
236 b
= SYMBOL_BLOCK_VALUE (func
);
238 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
242 /* Keep track of the highest stack argument offset seen, and
243 skip over any kinds of symbols we don't care about. */
245 switch (SYMBOL_CLASS (sym
))
250 long current_offset
= SYMBOL_VALUE (sym
);
251 arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
253 /* Compute address of next argument by adding the size of
254 this argument and rounding to an int boundary. */
256 ((current_offset
+ arg_size
+ sizeof (int) - 1)
257 & ~(sizeof (int) - 1));
259 /* If this is the highest offset seen yet, set highest_offset. */
260 if (highest_offset
== -1
261 || (current_offset
> highest_offset
))
262 highest_offset
= current_offset
;
264 /* Add the number of ints we're about to print to args_printed. */
265 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
268 /* We care about types of symbols, but don't need to keep track of
269 stack offsets in them. */
271 case LOC_REGPARM_ADDR
:
273 case LOC_BASEREG_ARG
:
274 case LOC_COMPUTED_ARG
:
277 /* Other types of symbols we just skip over. */
282 /* We have to look up the symbol because arguments can have
283 two entries (one a parameter, one a local) and the one we
284 want is the local, which lookup_symbol will find for us.
285 This includes gcc1 (not gcc2) on the sparc when passing a
286 small structure and gcc2 when the argument type is float
287 and it is passed as a double and converted to float by
288 the prologue (in the latter case the type of the LOC_ARG
289 symbol is double and the type of the LOC_LOCAL symbol is
291 /* But if the parameter name is null, don't try it.
292 Null parameter names occur on the RS/6000, for traceback tables.
293 FIXME, should we even print them? */
295 if (*DEPRECATED_SYMBOL_NAME (sym
))
299 (DEPRECATED_SYMBOL_NAME (sym
),
300 b
, VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
301 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
)
303 /* There is a LOC_ARG/LOC_REGISTER pair. This means that
304 it was passed on the stack and loaded into a register,
305 or passed in a register and stored in a stack slot.
306 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER.
308 Reasons for using the LOC_ARG:
309 (1) because find_saved_registers may be slow for remote
311 (2) because registers are often re-used and stack slots
312 rarely (never?) are. Therefore using the stack slot is
313 much less likely to print garbage.
315 Reasons why we might want to use the LOC_REGISTER:
316 (1) So that the backtrace prints the same value as
317 "print foo". I see no compelling reason why this needs
318 to be the case; having the backtrace print the value which
319 was passed in, and "print foo" print the value as modified
320 within the called function, makes perfect sense to me.
322 Additional note: It might be nice if "info args" displayed
324 One more note: There is a case with sparc structure passing
325 where we need to use the LOC_REGISTER, but this is dealt with
326 by creating a single LOC_REGPARM in symbol reading. */
328 /* Leave sym (the LOC_ARG) alone. */
335 /* Print the current arg. */
337 ui_out_text (uiout
, ", ");
338 ui_out_wrap_hint (uiout
, " ");
340 annotate_arg_begin ();
342 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
343 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
344 SYMBOL_LANGUAGE (sym
), DMGL_PARAMS
| DMGL_ANSI
);
345 ui_out_field_stream (uiout
, "name", stb
);
346 annotate_arg_name_end ();
347 ui_out_text (uiout
, "=");
349 /* Avoid value_print because it will deref ref parameters. We just
350 want to print their addresses. Print ??? for args whose address
351 we do not know. We pass 2 as "recurse" to val_print because our
352 standard indentation here is 4 spaces, and val_print indents
353 2 for each recurse. */
354 val
= read_var_value (sym
, fi
);
356 annotate_arg_value (val
== NULL
? NULL
: value_type (val
));
360 common_val_print (val
, stb
->stream
, 0, 0, 2, Val_no_prettyprint
);
361 ui_out_field_stream (uiout
, "value", stb
);
364 ui_out_text (uiout
, "???");
366 /* Invoke ui_out_tuple_end. */
367 do_cleanups (list_chain
);
375 /* Don't print nameless args in situations where we don't know
376 enough about the stack to find them. */
381 if (highest_offset
== -1)
382 start
= FRAME_ARGS_SKIP
;
384 start
= highest_offset
;
386 print_frame_nameless_args (fi
, start
, num
- args_printed
,
389 do_cleanups (old_chain
);
392 /* Pass the args the way catch_errors wants them. */
395 print_args_stub (void *args
)
398 struct print_args_args
*p
= (struct print_args_args
*) args
;
400 if (FRAME_NUM_ARGS_P ())
402 numargs
= FRAME_NUM_ARGS (p
->fi
);
403 gdb_assert (numargs
>= 0);
407 print_frame_args (p
->func
, p
->fi
, numargs
, p
->stream
);
411 /* Set the current source and line to the location of the given
412 frame, if possible. When CENTER is true, adjust so the
413 relevant line is in the center of the next 'list'. */
416 set_current_sal_from_frame (struct frame_info
*fi
, int center
)
418 struct symtab_and_line sal
;
420 find_frame_sal (fi
, &sal
);
424 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
425 set_current_source_symtab_and_line (&sal
);
429 /* Print information about a frame for frame "fi" at level "level".
430 Used in "where" output, also used to emit breakpoint or step
432 LEVEL is the level of the frame, or -1 if it is the
433 innermost frame but we don't want to print the level.
434 The meaning of the SOURCE argument is:
435 SRC_LINE: Print only source line
436 LOCATION: Print only location
437 LOC_AND_SRC: Print location and source line. */
440 print_frame_info (struct frame_info
*fi
, int print_level
,
441 enum print_what print_what
, int print_args
)
443 struct symtab_and_line sal
;
447 if (get_frame_type (fi
) == DUMMY_FRAME
448 || get_frame_type (fi
) == SIGTRAMP_FRAME
)
450 struct cleanup
*uiout_cleanup
451 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
453 annotate_frame_begin (print_level
? frame_relative_level (fi
) : 0,
456 /* Do this regardless of SOURCE because we don't have any source
457 to list for this frame. */
460 ui_out_text (uiout
, "#");
461 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
462 frame_relative_level (fi
));
464 if (ui_out_is_mi_like_p (uiout
))
466 annotate_frame_address ();
467 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
468 annotate_frame_address_end ();
471 if (get_frame_type (fi
) == DUMMY_FRAME
)
473 annotate_function_call ();
474 ui_out_field_string (uiout
, "func", "<function called from gdb>");
476 else if (get_frame_type (fi
) == SIGTRAMP_FRAME
)
478 annotate_signal_handler_caller ();
479 ui_out_field_string (uiout
, "func", "<signal handler called>");
481 ui_out_text (uiout
, "\n");
482 annotate_frame_end ();
484 do_cleanups (uiout_cleanup
);
488 /* If fi is not the innermost frame, that normally means that fi->pc
489 points to *after* the call instruction, and we want to get the
490 line containing the call, never the next line. But if the next
491 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
492 was not entered as the result of a call, and we want to get the
493 line containing fi->pc. */
494 find_frame_sal (fi
, &sal
);
496 location_print
= (print_what
== LOCATION
497 || print_what
== LOC_AND_ADDRESS
498 || print_what
== SRC_AND_LOC
);
500 if (location_print
|| !sal
.symtab
)
501 print_frame (fi
, print_level
, print_what
, print_args
, sal
);
503 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
505 if (source_print
&& sal
.symtab
)
508 int mid_statement
= ((print_what
== SRC_LINE
)
509 && (get_frame_pc (fi
) != sal
.pc
));
511 if (annotation_level
)
512 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
516 if (deprecated_print_frame_info_listing_hook
)
517 deprecated_print_frame_info_listing_hook (sal
.symtab
,
522 /* We used to do this earlier, but that is clearly
523 wrong. This function is used by many different
524 parts of gdb, including normal_stop in infrun.c,
525 which uses this to print out the current PC
526 when we stepi/nexti into the middle of a source
527 line. Only the command line really wants this
528 behavior. Other UIs probably would like the
529 ability to decide for themselves if it is desired. */
530 if (addressprint
&& mid_statement
)
532 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
533 ui_out_text (uiout
, "\t");
536 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
541 if (print_what
!= LOCATION
)
542 set_default_breakpoint (1, get_frame_pc (fi
), sal
.symtab
, sal
.line
);
544 annotate_frame_end ();
546 gdb_flush (gdb_stdout
);
550 print_frame (struct frame_info
*fi
,
552 enum print_what print_what
,
554 struct symtab_and_line sal
)
558 enum language funlang
= language_unknown
;
559 struct ui_stream
*stb
;
560 struct cleanup
*old_chain
;
561 struct cleanup
*list_chain
;
563 stb
= ui_out_stream_new (uiout
);
564 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
566 func
= find_pc_function (get_frame_address_in_block (fi
));
569 /* In certain pathological cases, the symtabs give the wrong
570 function (when we are in the first function in a file which
571 is compiled without debugging symbols, the previous function
572 is compiled with debugging symbols, and the "foo.o" symbol
573 that is supposed to tell us where the file with debugging symbols
574 ends has been truncated by ar because it is longer than 15
575 characters). This also occurs if the user uses asm() to create
576 a function but not stabs for it (in a file compiled -g).
578 So look in the minimal symbol tables as well, and if it comes
579 up with a larger address for the function use that instead.
580 I don't think this can ever cause any problems; there shouldn't
581 be any minimal symbols in the middle of a function; if this is
582 ever changed many parts of GDB will need to be changed (and we'll
583 create a find_pc_minimal_function or some such). */
585 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi
));
587 && (SYMBOL_VALUE_ADDRESS (msymbol
)
588 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
590 /* We also don't know anything about the function besides
591 its address and name. */
593 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
594 funlang
= SYMBOL_LANGUAGE (msymbol
);
598 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
599 demangled name that we already have stored in the symbol
600 table, but we stored a version with DMGL_PARAMS turned
601 on, and here we don't want to display parameters. So call
602 the demangler again, with DMGL_ANSI only. (Yes, I know
603 that printf_symbol_filtered() will again try to demangle
604 the name on the fly, but the issue is that if
605 cplus_demangle() fails here, it'll fail there too. So we
606 want to catch the failure ("demangled==NULL" case below)
607 here, while we still have our hands on the function
610 funname
= DEPRECATED_SYMBOL_NAME (func
);
611 funlang
= SYMBOL_LANGUAGE (func
);
612 if (funlang
== language_cplus
)
614 demangled
= cplus_demangle (funname
, DMGL_ANSI
);
615 if (demangled
== NULL
)
616 /* If the demangler fails, try the demangled name from
617 the symbol table. This'll have parameters, but
618 that's preferable to diplaying a mangled name. */
619 funname
= SYMBOL_PRINT_NAME (func
);
625 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi
));
628 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
629 funlang
= SYMBOL_LANGUAGE (msymbol
);
633 annotate_frame_begin (print_level
? frame_relative_level (fi
) : 0,
636 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
640 ui_out_text (uiout
, "#");
641 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
642 frame_relative_level (fi
));
645 if (get_frame_pc (fi
) != sal
.pc
647 || print_what
== LOC_AND_ADDRESS
)
649 annotate_frame_address ();
650 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
651 annotate_frame_address_end ();
652 ui_out_text (uiout
, " in ");
654 annotate_frame_function_name ();
655 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??", funlang
,
657 ui_out_field_stream (uiout
, "func", stb
);
658 ui_out_wrap_hint (uiout
, " ");
659 annotate_frame_args ();
661 ui_out_text (uiout
, " (");
664 struct print_args_args args
;
665 struct cleanup
*args_list_chain
;
668 args
.stream
= gdb_stdout
;
669 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
670 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
671 /* FIXME: args must be a list. If one argument is a string it will
672 have " that will not be properly escaped. */
673 /* Invoke ui_out_tuple_end. */
674 do_cleanups (args_list_chain
);
677 ui_out_text (uiout
, ")");
678 if (sal
.symtab
&& sal
.symtab
->filename
)
680 annotate_frame_source_begin ();
681 ui_out_wrap_hint (uiout
, " ");
682 ui_out_text (uiout
, " at ");
683 annotate_frame_source_file ();
684 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
685 if (ui_out_is_mi_like_p (uiout
))
687 const char *fullname
= symtab_to_fullname (sal
.symtab
);
688 if (fullname
!= NULL
)
689 ui_out_field_string (uiout
, "fullname", fullname
);
691 annotate_frame_source_file_end ();
692 ui_out_text (uiout
, ":");
693 annotate_frame_source_line ();
694 ui_out_field_int (uiout
, "line", sal
.line
);
695 annotate_frame_source_end ();
698 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
701 char *lib
= PC_SOLIB (get_frame_pc (fi
));
703 char *lib
= solib_address (get_frame_pc (fi
));
707 annotate_frame_where ();
708 ui_out_wrap_hint (uiout
, " ");
709 ui_out_text (uiout
, " from ");
710 ui_out_field_string (uiout
, "from", lib
);
714 /* do_cleanups will call ui_out_tuple_end() for us. */
715 do_cleanups (list_chain
);
716 ui_out_text (uiout
, "\n");
717 do_cleanups (old_chain
);
720 /* Show the frame info. If this is the tui, it will be shown in
721 the source display otherwise, nothing is done */
723 show_stack_frame (struct frame_info
*fi
)
728 /* Read a frame specification in whatever the appropriate format is.
729 Call error() if the specification is in any way invalid (i.e. this
730 function never returns NULL). When SEPECTED_P is non-NULL set it's
731 target to indicate that the default selected frame was used. */
733 static struct frame_info
*
734 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
735 int *selected_frame_p
)
738 struct value
*args
[4];
739 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
741 if (frame_exp
== NULL
)
746 struct cleanup
*tmp_cleanup
;
752 struct cleanup
*cleanup
;
755 /* Skip leading white space, bail of EOL. */
756 while (isspace (*frame_exp
))
761 /* Parse the argument, extract it, save it. */
765 addr_string
= savestring (frame_exp
, p
- frame_exp
);
767 cleanup
= make_cleanup (xfree
, addr_string
);
769 /* NOTE: Parse and evaluate expression, but do not use
770 functions such as parse_and_eval_long or
771 parse_and_eval_address to also extract the value.
772 Instead value_as_long and value_as_address are used.
773 This avoids problems with expressions that contain
775 if (numargs
>= ARRAY_SIZE (args
))
776 error (_("Too many args in frame specification"));
777 args
[numargs
++] = parse_and_eval (addr_string
);
779 do_cleanups (cleanup
);
783 /* If no args, default to the selected frame. */
786 if (selected_frame_p
!= NULL
)
787 (*selected_frame_p
) = 1;
788 return get_selected_frame (message
);
791 /* None of the remaining use the selected frame. */
792 if (selected_frame_p
!= NULL
)
793 (*selected_frame_p
) = 0;
795 /* Assume the single arg[0] is an integer, and try using that to
796 select a frame relative to current. */
799 struct frame_info
*fid
;
800 int level
= value_as_long (args
[0]);
801 fid
= find_relative_frame (get_current_frame (), &level
);
803 /* find_relative_frame was successful */
807 /* Convert each value into a corresponding address. */
810 for (i
= 0; i
< numargs
; i
++)
811 addrs
[i
] = value_as_address (args
[0]);
814 /* Assume that the single arg[0] is an address, use that to identify
815 a frame with a matching ID. Should this also accept stack/pc or
819 struct frame_id id
= frame_id_build_wild (addrs
[0]);
820 struct frame_info
*fid
;
822 /* If (s)he specifies the frame with an address, he deserves
823 what (s)he gets. Still, give the highest one that matches.
824 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
826 for (fid
= get_current_frame ();
828 fid
= get_prev_frame (fid
))
830 if (frame_id_eq (id
, get_frame_id (fid
)))
832 while (frame_id_eq (id
, frame_unwind_id (fid
)))
833 fid
= get_prev_frame (fid
);
839 /* We couldn't identify the frame as an existing frame, but
840 perhaps we can create one with a single argument. */
842 return create_new_frame (addrs
[0], 0);
843 else if (numargs
== 2)
844 return create_new_frame (addrs
[0], addrs
[1]);
846 error (_("Too many args in frame specification"));
849 static struct frame_info
*
850 parse_frame_specification (char *frame_exp
)
852 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
855 /* Print verbosely the selected frame or the frame at address ADDR.
856 This means absolutely all information in the frame is printed. */
859 frame_info (char *addr_exp
, int from_tty
)
861 struct frame_info
*fi
;
862 struct symtab_and_line sal
;
865 struct frame_info
*calling_frame_info
;
866 int i
, count
, numregs
;
868 enum language funlang
= language_unknown
;
869 const char *pc_regname
;
870 int selected_frame_p
;
872 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
874 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
875 is not a good name. */
877 /* OK, this is weird. The PC_REGNUM hardware register's value can
878 easily not match that of the internal value returned by
880 pc_regname
= REGISTER_NAME (PC_REGNUM
);
882 /* But then, this is weird to. Even without PC_REGNUM, an
883 architectures will often have a hardware register called "pc",
884 and that register's value, again, can easily not match
888 find_frame_sal (fi
, &sal
);
889 func
= get_frame_function (fi
);
890 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
892 s
= find_pc_symtab (get_frame_pc (fi
));
895 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
896 * the demangled name that we already have stored in
897 * the symbol table, but we stored a version with
898 * DMGL_PARAMS turned on, and here we don't want
899 * to display parameters. So call the demangler again,
900 * with DMGL_ANSI only. RT
901 * (Yes, I know that printf_symbol_filtered() will
902 * again try to demangle the name on the fly, but
903 * the issue is that if cplus_demangle() fails here,
904 * it'll fail there too. So we want to catch the failure
905 * ("demangled==NULL" case below) here, while we still
906 * have our hands on the function symbol.)
909 funname
= DEPRECATED_SYMBOL_NAME (func
);
910 funlang
= SYMBOL_LANGUAGE (func
);
911 if (funlang
== language_cplus
)
913 demangled
= cplus_demangle (funname
, DMGL_ANSI
);
914 /* If the demangler fails, try the demangled name
915 * from the symbol table. This'll have parameters,
916 * but that's preferable to diplaying a mangled name.
918 if (demangled
== NULL
)
919 funname
= SYMBOL_PRINT_NAME (func
);
924 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
927 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
928 funlang
= SYMBOL_LANGUAGE (msymbol
);
931 calling_frame_info
= get_prev_frame (fi
);
933 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
935 printf_filtered (_("Stack level %d, frame at "),
936 frame_relative_level (fi
));
940 printf_filtered (_("Stack frame at "));
942 deprecated_print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
943 printf_filtered (":\n");
944 printf_filtered (" %s = ", pc_regname
);
945 deprecated_print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
950 printf_filtered (" in ");
951 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
952 DMGL_ANSI
| DMGL_PARAMS
);
956 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
957 puts_filtered ("; ");
959 printf_filtered ("saved %s ", pc_regname
);
960 deprecated_print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
961 printf_filtered ("\n");
963 if (calling_frame_info
)
965 printf_filtered (" called by frame at ");
966 deprecated_print_address_numeric (get_frame_base (calling_frame_info
),
969 if (get_next_frame (fi
) && calling_frame_info
)
972 if (get_next_frame (fi
))
974 printf_filtered (" caller of frame at ");
975 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
978 if (get_next_frame (fi
) || calling_frame_info
)
979 puts_filtered ("\n");
981 printf_filtered (" source language %s.\n",
982 language_str (s
->language
));
985 /* Address of the argument list for this frame, or 0. */
986 CORE_ADDR arg_list
= get_frame_args_address (fi
);
987 /* Number of args for this frame, or -1 if unknown. */
991 printf_filtered (" Arglist at unknown address.\n");
994 printf_filtered (" Arglist at ");
995 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
996 printf_filtered (",");
998 if (!FRAME_NUM_ARGS_P ())
1001 puts_filtered (" args: ");
1005 numargs
= FRAME_NUM_ARGS (fi
);
1006 gdb_assert (numargs
>= 0);
1008 puts_filtered (" no args.");
1009 else if (numargs
== 1)
1010 puts_filtered (" 1 arg: ");
1012 printf_filtered (" %d args: ", numargs
);
1014 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1015 puts_filtered ("\n");
1019 /* Address of the local variables for this frame, or 0. */
1020 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1023 printf_filtered (" Locals at unknown address,");
1026 printf_filtered (" Locals at ");
1027 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1028 printf_filtered (",");
1032 /* Print as much information as possible on the location of all the
1035 enum lval_type lval
;
1043 /* The sp is special; what's displayed isn't the save address, but
1044 the value of the previous frame's sp. This is a legacy thing,
1045 at one stage the frame cached the previous frame's SP instead
1046 of its address, hence it was easiest to just display the cached
1050 /* Find out the location of the saved stack pointer with out
1051 actually evaluating it. */
1052 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1054 if (!optimized
&& lval
== not_lval
)
1056 gdb_byte value
[MAX_REGISTER_SIZE
];
1058 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1060 /* NOTE: cagney/2003-05-22: This is assuming that the
1061 stack pointer was packed as an unsigned integer. That
1062 may or may not be valid. */
1063 sp
= extract_unsigned_integer (value
, register_size (current_gdbarch
, SP_REGNUM
));
1064 printf_filtered (" Previous frame's sp is ");
1065 deprecated_print_address_numeric (sp
, 1, gdb_stdout
);
1066 printf_filtered ("\n");
1069 else if (!optimized
&& lval
== lval_memory
)
1071 printf_filtered (" Previous frame's sp at ");
1072 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1073 printf_filtered ("\n");
1076 else if (!optimized
&& lval
== lval_register
)
1078 printf_filtered (" Previous frame's sp in %s\n",
1079 REGISTER_NAME (realnum
));
1082 /* else keep quiet. */
1086 numregs
= NUM_REGS
+ NUM_PSEUDO_REGS
;
1087 for (i
= 0; i
< numregs
; i
++)
1089 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1091 /* Find out the location of the saved register without
1092 fetching the corresponding value. */
1093 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1095 /* For moment, only display registers that were saved on the
1097 if (!optimized
&& lval
== lval_memory
)
1100 puts_filtered (" Saved registers:\n ");
1102 puts_filtered (",");
1104 printf_filtered (" %s at ", REGISTER_NAME (i
));
1105 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1109 if (count
|| need_nl
)
1110 puts_filtered ("\n");
1114 /* Print briefly all stack frames or just the innermost COUNT frames. */
1116 static void backtrace_command_1 (char *count_exp
, int show_locals
,
1119 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1121 struct frame_info
*fi
;
1124 struct frame_info
*trailing
;
1127 if (!target_has_stack
)
1128 error (_("No stack."));
1130 /* The following code must do two things. First, it must
1131 set the variable TRAILING to the frame from which we should start
1132 printing. Second, it must set the variable count to the number
1133 of frames which we should print, or -1 if all of them. */
1134 trailing
= get_current_frame ();
1136 /* The target can be in a state where there is no valid frames
1137 (e.g., just connected). */
1138 if (trailing
== NULL
)
1139 error (_("No stack."));
1144 count
= parse_and_eval_long (count_exp
);
1147 struct frame_info
*current
;
1152 while (current
&& count
--)
1155 current
= get_prev_frame (current
);
1158 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1159 will be COUNT below it. */
1163 trailing
= get_prev_frame (trailing
);
1164 current
= get_prev_frame (current
);
1176 struct partial_symtab
*ps
;
1178 /* Read in symbols for all of the frames. Need to do this in
1179 a separate pass so that "Reading in symbols for xxx" messages
1180 don't screw up the appearance of the backtrace. Also
1181 if people have strong opinions against reading symbols for
1182 backtrace this may have to be an option. */
1186 fi
= get_prev_frame (fi
))
1189 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1191 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in */
1195 for (i
= 0, fi
= trailing
;
1197 i
++, fi
= get_prev_frame (fi
))
1201 /* Don't use print_stack_frame; if an error() occurs it probably
1202 means further attempts to backtrace would fail (on the other
1203 hand, perhaps the code does or could be fixed to make sure
1204 the frame->prev field gets set to NULL in that case). */
1205 print_frame_info (fi
, 1, LOCATION
, 1);
1207 print_frame_local_vars (fi
, 1, gdb_stdout
);
1210 /* If we've stopped before the end, mention that. */
1212 printf_filtered (_("(More stack frames follow...)\n"));
1215 struct backtrace_command_args
1222 /* Stub to call backtrace_command_1 by way of an error catcher. */
1224 backtrace_command_stub (void *data
)
1226 struct backtrace_command_args
*args
= (struct backtrace_command_args
*)data
;
1227 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1232 backtrace_command (char *arg
, int from_tty
)
1234 struct cleanup
*old_chain
= (struct cleanup
*) NULL
;
1235 char **argv
= (char **) NULL
;
1236 int argIndicatingFullTrace
= (-1), totArgLen
= 0, argc
= 0;
1238 struct backtrace_command_args btargs
;
1240 if (arg
!= (char *) NULL
)
1244 argv
= buildargv (arg
);
1245 old_chain
= make_cleanup_freeargv (argv
);
1247 for (i
= 0; (argv
[i
] != (char *) NULL
); i
++)
1251 for (j
= 0; (j
< strlen (argv
[i
])); j
++)
1252 argv
[i
][j
] = tolower (argv
[i
][j
]);
1254 if (argIndicatingFullTrace
< 0 && subset_compare (argv
[i
], "full"))
1255 argIndicatingFullTrace
= argc
;
1259 totArgLen
+= strlen (argv
[i
]);
1263 if (argIndicatingFullTrace
>= 0)
1267 argPtr
= (char *) xmalloc (totArgLen
+ 1);
1272 memset (argPtr
, 0, totArgLen
+ 1);
1273 for (i
= 0; (i
< (argc
+ 1)); i
++)
1275 if (i
!= argIndicatingFullTrace
)
1277 strcat (argPtr
, argv
[i
]);
1278 strcat (argPtr
, " ");
1284 argPtr
= (char *) NULL
;
1288 btargs
.count_exp
= argPtr
;
1289 btargs
.show_locals
= (argIndicatingFullTrace
>= 0);
1290 btargs
.from_tty
= from_tty
;
1291 catch_errors (backtrace_command_stub
, (char *)&btargs
, "", RETURN_MASK_ERROR
);
1293 if (argIndicatingFullTrace
>= 0 && totArgLen
> 0)
1297 do_cleanups (old_chain
);
1300 static void backtrace_full_command (char *arg
, int from_tty
);
1302 backtrace_full_command (char *arg
, int from_tty
)
1304 struct backtrace_command_args btargs
;
1305 btargs
.count_exp
= arg
;
1306 btargs
.show_locals
= 1;
1307 btargs
.from_tty
= from_tty
;
1308 catch_errors (backtrace_command_stub
, (char *)&btargs
, "", RETURN_MASK_ERROR
);
1312 /* Print the local variables of a block B active in FRAME.
1313 Return 1 if any variables were printed; 0 otherwise. */
1316 print_block_frame_locals (struct block
*b
, struct frame_info
*fi
,
1317 int num_tabs
, struct ui_file
*stream
)
1319 struct dict_iterator iter
;
1322 int values_printed
= 0;
1324 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1326 switch (SYMBOL_CLASS (sym
))
1334 for (j
= 0; j
< num_tabs
; j
++)
1335 fputs_filtered ("\t", stream
);
1336 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1337 fputs_filtered (" = ", stream
);
1338 print_variable_value (sym
, fi
, stream
);
1339 fprintf_filtered (stream
, "\n");
1343 /* Ignore symbols which are not locals. */
1347 return values_printed
;
1350 /* Same, but print labels. */
1353 print_block_frame_labels (struct block
*b
, int *have_default
,
1354 struct ui_file
*stream
)
1356 struct dict_iterator iter
;
1358 int values_printed
= 0;
1360 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1362 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1368 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1370 struct symtab_and_line sal
;
1371 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1373 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1376 fprintf_filtered (stream
, " ");
1377 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1379 fprintf_filtered (stream
, " in file %s, line %d\n",
1380 sal
.symtab
->filename
, sal
.line
);
1383 return values_printed
;
1386 /* Print on STREAM all the local variables in frame FRAME,
1387 including all the blocks active in that frame
1390 Returns 1 if the job was done,
1391 or 0 if nothing was printed because we have no info
1392 on the function running in FRAME. */
1395 print_frame_local_vars (struct frame_info
*fi
, int num_tabs
,
1396 struct ui_file
*stream
)
1398 struct block
*block
= get_frame_block (fi
, 0);
1399 int values_printed
= 0;
1403 fprintf_filtered (stream
, "No symbol table info available.\n");
1409 if (print_block_frame_locals (block
, fi
, num_tabs
, stream
))
1411 /* After handling the function's top-level block, stop.
1412 Don't continue to its superblock, the block of
1413 per-file symbols. */
1414 if (BLOCK_FUNCTION (block
))
1416 block
= BLOCK_SUPERBLOCK (block
);
1419 if (!values_printed
)
1421 fprintf_filtered (stream
, "No locals.\n");
1425 /* Same, but print labels. */
1428 print_frame_label_vars (struct frame_info
*fi
, int this_level_only
,
1429 struct ui_file
*stream
)
1431 struct blockvector
*bl
;
1432 struct block
*block
= get_frame_block (fi
, 0);
1433 int values_printed
= 0;
1434 int index
, have_default
= 0;
1435 char *blocks_printed
;
1436 CORE_ADDR pc
= get_frame_pc (fi
);
1440 fprintf_filtered (stream
, "No symbol table info available.\n");
1444 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1445 blocks_printed
= (char *) alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1446 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1450 CORE_ADDR end
= BLOCK_END (block
) - 4;
1453 if (bl
!= blockvector_for_pc (end
, &index
))
1454 error (_("blockvector blotch"));
1455 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1456 error (_("blockvector botch"));
1457 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1460 /* Don't print out blocks that have gone by. */
1461 while (index
< last_index
1462 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1465 while (index
< last_index
1466 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1468 if (blocks_printed
[index
] == 0)
1470 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
), &have_default
, stream
))
1472 blocks_printed
[index
] = 1;
1478 if (values_printed
&& this_level_only
)
1481 /* After handling the function's top-level block, stop.
1482 Don't continue to its superblock, the block of
1483 per-file symbols. */
1484 if (BLOCK_FUNCTION (block
))
1486 block
= BLOCK_SUPERBLOCK (block
);
1489 if (!values_printed
&& !this_level_only
)
1491 fprintf_filtered (stream
, "No catches.\n");
1496 locals_info (char *args
, int from_tty
)
1498 print_frame_local_vars (get_selected_frame ("No frame selected."),
1503 catch_info (char *ignore
, int from_tty
)
1505 struct symtab_and_line
*sal
;
1507 /* Check for target support for exception handling */
1508 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1511 /* Currently not handling this */
1512 /* Ideally, here we should interact with the C++ runtime
1513 system to find the list of active handlers, etc. */
1514 fprintf_filtered (gdb_stdout
, "Info catch not supported with this target/compiler combination.\n");
1518 /* Assume g++ compiled code -- old v 4.16 behaviour */
1519 print_frame_label_vars (get_selected_frame ("No frame selected."),
1525 print_frame_arg_vars (struct frame_info
*fi
,
1526 struct ui_file
*stream
)
1528 struct symbol
*func
= get_frame_function (fi
);
1530 struct dict_iterator iter
;
1531 struct symbol
*sym
, *sym2
;
1532 int values_printed
= 0;
1536 fprintf_filtered (stream
, "No symbol table info available.\n");
1540 b
= SYMBOL_BLOCK_VALUE (func
);
1541 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1543 switch (SYMBOL_CLASS (sym
))
1549 case LOC_REGPARM_ADDR
:
1550 case LOC_BASEREG_ARG
:
1551 case LOC_COMPUTED_ARG
:
1553 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1554 fputs_filtered (" = ", stream
);
1556 /* We have to look up the symbol because arguments can have
1557 two entries (one a parameter, one a local) and the one we
1558 want is the local, which lookup_symbol will find for us.
1559 This includes gcc1 (not gcc2) on the sparc when passing a
1560 small structure and gcc2 when the argument type is float
1561 and it is passed as a double and converted to float by
1562 the prologue (in the latter case the type of the LOC_ARG
1563 symbol is double and the type of the LOC_LOCAL symbol is
1564 float). There are also LOC_ARG/LOC_REGISTER pairs which
1565 are not combined in symbol-reading. */
1567 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1568 b
, VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
1569 print_variable_value (sym2
, fi
, stream
);
1570 fprintf_filtered (stream
, "\n");
1574 /* Don't worry about things which aren't arguments. */
1578 if (!values_printed
)
1580 fprintf_filtered (stream
, "No arguments.\n");
1585 args_info (char *ignore
, int from_tty
)
1587 print_frame_arg_vars (get_selected_frame ("No frame selected."),
1593 args_plus_locals_info (char *ignore
, int from_tty
)
1595 args_info (ignore
, from_tty
);
1596 locals_info (ignore
, from_tty
);
1600 /* Select frame FI. Also print the stack frame and show the source if
1601 this is the tui version. */
1603 select_and_print_frame (struct frame_info
*fi
)
1607 print_stack_frame (fi
, 1, SRC_AND_LOC
);
1610 /* Return the symbol-block in which the selected frame is executing.
1611 Can return zero under various legitimate circumstances.
1613 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1614 code address within the block returned. We use this to decide
1615 which macros are in scope. */
1618 get_selected_block (CORE_ADDR
*addr_in_block
)
1620 if (!target_has_stack
)
1623 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1624 a selected/current frame? Perhaps this function is called,
1625 indirectly, by WFI in "infrun.c" where avoiding the creation of
1626 an inner most frame is very important (it slows down single
1627 step). I suspect, though that this was true in the deep dark
1628 past but is no longer the case. A mindless look at all the
1629 callers tends to support this theory. I think we should be able
1630 to assume that there is always a selcted frame. */
1631 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1633 if (!deprecated_selected_frame
)
1635 CORE_ADDR pc
= read_pc ();
1636 if (addr_in_block
!= NULL
)
1637 *addr_in_block
= pc
;
1638 return block_for_pc (pc
);
1640 return get_frame_block (deprecated_selected_frame
, addr_in_block
);
1643 /* Find a frame a certain number of levels away from FRAME.
1644 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1645 Positive means go to earlier frames (up); negative, the reverse.
1646 The int that contains the number of levels is counted toward
1647 zero as the frames for those levels are found.
1648 If the top or bottom frame is reached, that frame is returned,
1649 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1650 how much farther the original request asked to go. */
1653 find_relative_frame (struct frame_info
*frame
,
1654 int *level_offset_ptr
)
1656 struct frame_info
*prev
;
1657 struct frame_info
*frame1
;
1659 /* Going up is simple: just do get_prev_frame enough times
1660 or until initial frame is reached. */
1661 while (*level_offset_ptr
> 0)
1663 prev
= get_prev_frame (frame
);
1666 (*level_offset_ptr
)--;
1669 /* Going down is just as simple. */
1670 if (*level_offset_ptr
< 0)
1672 while (*level_offset_ptr
< 0)
1674 frame1
= get_next_frame (frame
);
1678 (*level_offset_ptr
)++;
1684 /* The "select_frame" command. With no arg, NOP.
1685 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1686 valid level. Otherwise, treat level_exp as an address expression
1687 and select it. See parse_frame_specification for more info on proper
1688 frame expressions. */
1691 select_frame_command (char *level_exp
, int from_tty
)
1693 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1696 /* The "frame" command. With no arg, print selected frame briefly.
1697 With arg, behaves like select_frame and then prints the selected
1701 frame_command (char *level_exp
, int from_tty
)
1703 select_frame_command (level_exp
, from_tty
);
1704 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1707 /* The XDB Compatibility command to print the current frame. */
1710 current_frame_command (char *level_exp
, int from_tty
)
1712 print_stack_frame (get_selected_frame ("No stack."), 1, SRC_AND_LOC
);
1715 /* Select the frame up one or COUNT stack levels
1716 from the previously selected frame, and print it briefly. */
1719 up_silently_base (char *count_exp
)
1721 struct frame_info
*fi
;
1722 int count
= 1, count1
;
1724 count
= parse_and_eval_long (count_exp
);
1727 fi
= find_relative_frame (get_selected_frame ("No stack."), &count1
);
1728 if (count1
!= 0 && count_exp
== 0)
1729 error (_("Initial frame selected; you cannot go up."));
1734 up_silently_command (char *count_exp
, int from_tty
)
1736 up_silently_base (count_exp
);
1740 up_command (char *count_exp
, int from_tty
)
1742 up_silently_base (count_exp
);
1743 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1746 /* Select the frame down one or COUNT stack levels
1747 from the previously selected frame, and print it briefly. */
1750 down_silently_base (char *count_exp
)
1752 struct frame_info
*frame
;
1753 int count
= -1, count1
;
1755 count
= -parse_and_eval_long (count_exp
);
1758 frame
= find_relative_frame (get_selected_frame ("No stack."), &count1
);
1759 if (count1
!= 0 && count_exp
== 0)
1762 /* We only do this if count_exp is not specified. That way "down"
1763 means to really go down (and let me know if that is
1764 impossible), but "down 9999" can be used to mean go all the way
1765 down without getting an error. */
1767 error (_("Bottom (i.e., innermost) frame selected; you cannot go down."));
1770 select_frame (frame
);
1774 down_silently_command (char *count_exp
, int from_tty
)
1776 down_silently_base (count_exp
);
1780 down_command (char *count_exp
, int from_tty
)
1782 down_silently_base (count_exp
);
1783 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1787 return_command (char *retval_exp
, int from_tty
)
1789 struct symbol
*thisfun
;
1790 struct value
*return_value
= NULL
;
1791 const char *query_prefix
= "";
1793 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1795 /* Compute the return value. If the computation triggers an error,
1796 let it bail. If the return type can't be handled, set
1797 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1801 struct type
*return_type
= NULL
;
1803 /* Compute the return value. Should the computation fail, this
1804 call throws an error. */
1805 return_value
= parse_and_eval (retval_exp
);
1807 /* Cast return value to the return type of the function. Should
1808 the cast fail, this call throws an error. */
1809 if (thisfun
!= NULL
)
1810 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1811 if (return_type
== NULL
)
1812 return_type
= builtin_type_int
;
1813 CHECK_TYPEDEF (return_type
);
1814 return_value
= value_cast (return_type
, return_value
);
1816 /* Make sure the value is fully evaluated. It may live in the
1817 stack frame we're about to pop. */
1818 if (value_lazy (return_value
))
1819 value_fetch_lazy (return_value
);
1821 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1822 /* If the return-type is "void", don't try to find the
1823 return-value's location. However, do still evaluate the
1824 return expression so that, even when the expression result
1825 is discarded, side effects such as "return i++" still
1827 return_value
= NULL
;
1828 /* FIXME: cagney/2004-01-17: If the architecture implements both
1829 return_value and extract_returned_value_address, should allow
1830 "return" to work - don't set return_value to NULL. */
1831 else if (!gdbarch_return_value_p (current_gdbarch
)
1832 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1833 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1835 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1836 code. Old architectures don't expect STORE_RETURN_VALUE
1837 to be called with with a small struct that needs to be
1838 stored in registers. Don't start doing it now. */
1840 A structure or union return type is not supported by this architecture.\n\
1841 If you continue, the return value that you specified will be ignored.\n";
1842 return_value
= NULL
;
1844 else if (using_struct_return (return_type
, 0))
1847 The location at which to store the function's return value is unknown.\n\
1848 If you continue, the return value that you specified will be ignored.\n";
1849 return_value
= NULL
;
1853 /* Does an interactive user really want to do this? Include
1854 information, such as how well GDB can handle the return value, in
1855 the query message. */
1859 if (thisfun
== NULL
)
1860 confirmed
= query (_("%sMake selected stack frame return now? "),
1863 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1864 SYMBOL_PRINT_NAME (thisfun
));
1866 error (_("Not confirmed"));
1869 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1870 frame in turn, should this code just go straight to the relevant
1871 frame and pop that? */
1873 /* First discard all frames inner-to the selected frame (making the
1874 selected frame current). */
1876 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1877 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1879 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1880 /* Caught in the safety net, oops! We've gone way past the
1882 error (_("Problem while popping stack frames (corrupt stack?)"));
1883 frame_pop (get_current_frame ());
1887 /* Second discard the selected frame (which is now also the current
1889 frame_pop (get_current_frame ());
1891 /* Store RETURN_VAUE in the just-returned register set. */
1892 if (return_value
!= NULL
)
1894 struct type
*return_type
= value_type (return_value
);
1895 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1897 == RETURN_VALUE_REGISTER_CONVENTION
);
1898 gdbarch_return_value (current_gdbarch
, return_type
,
1899 current_regcache
, NULL
/*read*/,
1900 value_contents (return_value
) /*write*/);
1903 /* If we are at the end of a call dummy now, pop the dummy frame
1905 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1906 frame_pop (get_current_frame ());
1908 /* If interactive, print the frame that is now current. */
1910 frame_command ("0", 1);
1912 select_frame_command ("0", 0);
1915 /* Sets the scope to input function name, provided that the
1916 function is within the current stack frame */
1918 struct function_bounds
1920 CORE_ADDR low
, high
;
1923 static void func_command (char *arg
, int from_tty
);
1925 func_command (char *arg
, int from_tty
)
1927 struct frame_info
*fp
;
1929 struct symtabs_and_lines sals
;
1932 struct function_bounds
*func_bounds
= (struct function_bounds
*) NULL
;
1934 if (arg
!= (char *) NULL
)
1937 fp
= parse_frame_specification ("0");
1938 sals
= decode_line_spec (arg
, 1);
1939 func_bounds
= (struct function_bounds
*) xmalloc (
1940 sizeof (struct function_bounds
) * sals
.nelts
);
1941 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1943 if (sals
.sals
[i
].pc
== (CORE_ADDR
) 0 ||
1944 find_pc_partial_function (sals
.sals
[i
].pc
,
1946 &func_bounds
[i
].low
,
1947 &func_bounds
[i
].high
) == 0)
1949 func_bounds
[i
].low
=
1950 func_bounds
[i
].high
= (CORE_ADDR
) NULL
;
1956 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1957 found
= (get_frame_pc (fp
) >= func_bounds
[i
].low
&&
1958 get_frame_pc (fp
) < func_bounds
[i
].high
);
1962 fp
= find_relative_frame (fp
, &level
);
1965 while (!found
&& level
== 0);
1968 xfree (func_bounds
);
1971 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1972 else if (fp
!= deprecated_selected_frame
)
1973 select_and_print_frame (fp
);
1976 /* Gets the language of the current frame. */
1979 get_frame_language (void)
1982 enum language flang
; /* The language of the current frame */
1984 if (deprecated_selected_frame
)
1986 /* We determine the current frame language by looking up its
1987 associated symtab. To retrieve this symtab, we use the frame PC.
1988 However we cannot use the frame pc as is, because it usually points
1989 to the instruction following the "call", which is sometimes the first
1990 instruction of another function. So we rely on
1991 get_frame_address_in_block(), it provides us with a PC which is
1992 guaranteed to be inside the frame's code block. */
1993 s
= find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame
));
1995 flang
= s
->language
;
1997 flang
= language_unknown
;
2000 flang
= language_unknown
;
2006 _initialize_stack (void)
2009 backtrace_limit
= 30;
2012 add_com ("return", class_stack
, return_command
, _("\
2013 Make selected stack frame return to its caller.\n\
2014 Control remains in the debugger, but when you continue\n\
2015 execution will resume in the frame above the one now selected.\n\
2016 If an argument is given, it is an expression for the value to return."));
2018 add_com ("up", class_stack
, up_command
, _("\
2019 Select and print stack frame that called this one.\n\
2020 An argument says how many frames up to go."));
2021 add_com ("up-silently", class_support
, up_silently_command
, _("\
2022 Same as the `up' command, but does not print anything.\n\
2023 This is useful in command scripts."));
2025 add_com ("down", class_stack
, down_command
, _("\
2026 Select and print stack frame called by this one.\n\
2027 An argument says how many frames down to go."));
2028 add_com_alias ("do", "down", class_stack
, 1);
2029 add_com_alias ("dow", "down", class_stack
, 1);
2030 add_com ("down-silently", class_support
, down_silently_command
, _("\
2031 Same as the `down' command, but does not print anything.\n\
2032 This is useful in command scripts."));
2034 add_com ("frame", class_stack
, frame_command
, _("\
2035 Select and print a stack frame.\n\
2036 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2037 An argument specifies the frame to select.\n\
2038 It can be a stack frame number or the address of the frame.\n\
2039 With argument, nothing is printed if input is coming from\n\
2040 a command file or a user-defined command."));
2042 add_com_alias ("f", "frame", class_stack
, 1);
2046 add_com ("L", class_stack
, current_frame_command
,
2047 _("Print the current stack frame.\n"));
2048 add_com_alias ("V", "frame", class_stack
, 1);
2050 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2051 Select a stack frame without printing anything.\n\
2052 An argument specifies the frame to select.\n\
2053 It can be a stack frame number or the address of the frame.\n"));
2055 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2056 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2057 With a negative argument, print outermost -COUNT frames.\n\
2058 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2059 add_com_alias ("bt", "backtrace", class_stack
, 0);
2062 add_com_alias ("t", "backtrace", class_stack
, 0);
2063 add_com ("T", class_stack
, backtrace_full_command
, _("\
2064 Print backtrace of all stack frames, or innermost COUNT frames \n\
2065 and the values of the local variables.\n\
2066 With a negative argument, print outermost -COUNT frames.\n\
2067 Usage: T <count>\n"));
2070 add_com_alias ("where", "backtrace", class_alias
, 0);
2071 add_info ("stack", backtrace_command
,
2072 _("Backtrace of the stack, or innermost COUNT frames."));
2073 add_info_alias ("s", "stack", 1);
2074 add_info ("frame", frame_info
,
2075 _("All about selected stack frame, or frame at ADDR."));
2076 add_info_alias ("f", "frame", 1);
2077 add_info ("locals", locals_info
,
2078 _("Local variables of current stack frame."));
2079 add_info ("args", args_info
,
2080 _("Argument variables of current stack frame."));
2082 add_com ("l", class_info
, args_plus_locals_info
,
2083 _("Argument and local variables of current stack frame."));
2086 add_com ("func", class_stack
, func_command
, _("\
2087 Select the stack frame that contains <func>.\n\
2088 Usage: func <name>\n"));
2090 add_info ("catch", catch_info
,
2091 _("Exceptions that can be caught in the current stack frame."));
2094 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2095 "Specify maximum number of frames for \"backtrace\" to print by default."),
2097 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2098 The maximum number of frames for \"backtrace\" to print by default."));