1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
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 3 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, see <http://www.gnu.org/licenses/>. */
26 #include "expression.h"
33 #include "breakpoint.h"
40 #include "dictionary.h"
41 #include "exceptions.h"
42 #include "reggroups.h"
47 #include "gdb_assert.h"
49 #include "gdb_string.h"
51 void (*deprecated_selected_frame_level_changed_hook
) (int);
53 /* The possible choices of "set print frame-arguments, and the value
56 static const char *print_frame_arguments_choices
[] =
57 {"all", "scalars", "none", NULL
};
58 static const char *print_frame_arguments
= "all";
60 /* Prototypes for local functions. */
62 static void print_frame_local_vars (struct frame_info
*, int,
65 static void print_frame (struct frame_info
*frame
, int print_level
,
66 enum print_what print_what
, int print_args
,
67 struct symtab_and_line sal
);
69 /* Zero means do things normally; we are interacting directly with the
70 user. One means print the full filename and linenumber when a
71 frame is printed, and do so in a format emacs18/emacs19.22 can
72 parse. Two means print similar annotations, but in many more
73 cases and in a slightly different syntax. */
75 int annotation_level
= 0;
78 struct print_stack_frame_args
80 struct frame_info
*frame
;
82 enum print_what print_what
;
86 /* Show or print the frame arguments; stub for catch_errors. */
89 print_stack_frame_stub (void *args
)
91 struct print_stack_frame_args
*p
= args
;
92 int center
= (p
->print_what
== SRC_LINE
|| p
->print_what
== SRC_AND_LOC
);
94 print_frame_info (p
->frame
, p
->print_level
, p
->print_what
, p
->print_args
);
95 set_current_sal_from_frame (p
->frame
, center
);
99 /* Show or print a stack frame FRAME briefly. The output is format
100 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
101 relative level, function name, argument list, and file name and
102 line number. If the frame's PC is not at the beginning of the
103 source line, the actual PC is printed at the beginning. */
106 print_stack_frame (struct frame_info
*frame
, int print_level
,
107 enum print_what print_what
)
109 struct print_stack_frame_args args
;
112 args
.print_level
= print_level
;
113 args
.print_what
= print_what
;
114 /* For mi, alway print location and address. */
115 args
.print_what
= ui_out_is_mi_like_p (uiout
) ? LOC_AND_ADDRESS
: print_what
;
118 catch_errors (print_stack_frame_stub
, &args
, "", RETURN_MASK_ERROR
);
121 struct print_args_args
124 struct frame_info
*frame
;
125 struct ui_file
*stream
;
128 static int print_args_stub (void *args
);
130 /* Print nameless arguments of frame FRAME on STREAM, where START is
131 the offset of the first nameless argument, and NUM is the number of
132 nameless arguments to print. FIRST is nonzero if this is the first
133 argument (not just the first nameless argument). */
136 print_frame_nameless_args (struct frame_info
*frame
, long start
, int num
,
137 int first
, struct ui_file
*stream
)
143 for (i
= 0; i
< num
; i
++)
146 argsaddr
= get_frame_args_address (frame
);
149 arg_value
= read_memory_integer (argsaddr
+ start
, sizeof (int));
151 fprintf_filtered (stream
, ", ");
152 fprintf_filtered (stream
, "%ld", arg_value
);
154 start
+= sizeof (int);
158 /* Return non-zero if the debugger should print the value of the provided
159 symbol parameter (SYM). */
162 print_this_frame_argument_p (struct symbol
*sym
)
166 /* If the user asked to print no argument at all, then obviously
167 do not print this argument. */
169 if (strcmp (print_frame_arguments
, "none") == 0)
172 /* If the user asked to print all arguments, then we should print
175 if (strcmp (print_frame_arguments
, "all") == 0)
178 /* The user asked to print only the scalar arguments, so do not
179 print the non-scalar ones. */
181 type
= CHECK_TYPEDEF (SYMBOL_TYPE (sym
));
182 while (TYPE_CODE (type
) == TYPE_CODE_REF
)
183 type
= CHECK_TYPEDEF (TYPE_TARGET_TYPE (type
));
184 switch (TYPE_CODE (type
))
186 case TYPE_CODE_ARRAY
:
187 case TYPE_CODE_STRUCT
:
188 case TYPE_CODE_UNION
:
190 case TYPE_CODE_STRING
:
191 case TYPE_CODE_BITSTRING
:
198 /* Print the arguments of frame FRAME on STREAM, given the function
199 FUNC running in that frame (as a symbol), where NUM is the number
200 of arguments according to the stack frame (or -1 if the number of
201 arguments is unknown). */
203 /* Note that currently the "number of argumentss according to the
204 stack frame" is only known on VAX where i refers to the "number of
205 ints of argumentss according to the stack frame". */
208 print_frame_args (struct symbol
*func
, struct frame_info
*frame
,
209 int num
, struct ui_file
*stream
)
212 /* Offset of next stack argument beyond the one we have seen that is
213 at the highest offset, or -1 if we haven't come to a stack
215 long highest_offset
= -1;
216 /* Number of ints of arguments that we have printed so far. */
217 int args_printed
= 0;
218 struct cleanup
*old_chain
, *list_chain
;
219 struct ui_stream
*stb
;
221 stb
= ui_out_stream_new (uiout
);
222 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
226 struct block
*b
= SYMBOL_BLOCK_VALUE (func
);
227 struct dict_iterator iter
;
231 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
235 /* Keep track of the highest stack argument offset seen, and
236 skip over any kinds of symbols we don't care about. */
238 if (!SYMBOL_IS_ARGUMENT (sym
))
241 switch (SYMBOL_CLASS (sym
))
246 long current_offset
= SYMBOL_VALUE (sym
);
247 int arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
249 /* Compute address of next argument by adding the size of
250 this argument and rounding to an int boundary. */
252 ((current_offset
+ arg_size
+ sizeof (int) - 1)
253 & ~(sizeof (int) - 1));
255 /* If this is the highest offset seen yet, set
257 if (highest_offset
== -1
258 || (current_offset
> highest_offset
))
259 highest_offset
= current_offset
;
261 /* Add the number of ints we're about to print to
263 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
266 /* We care about types of symbols, but don't need to
267 keep track of stack offsets in them. */
269 case LOC_REGPARM_ADDR
:
271 case LOC_OPTIMIZED_OUT
:
276 /* We have to look up the symbol because arguments can have
277 two entries (one a parameter, one a local) and the one we
278 want is the local, which lookup_symbol will find for us.
279 This includes gcc1 (not gcc2) on SPARC when passing a
280 small structure and gcc2 when the argument type is float
281 and it is passed as a double and converted to float by
282 the prologue (in the latter case the type of the LOC_ARG
283 symbol is double and the type of the LOC_LOCAL symbol is
285 /* But if the parameter name is null, don't try it. Null
286 parameter names occur on the RS/6000, for traceback
287 tables. FIXME, should we even print them? */
289 if (*DEPRECATED_SYMBOL_NAME (sym
))
292 nsym
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
293 b
, VAR_DOMAIN
, NULL
);
294 gdb_assert (nsym
!= NULL
);
295 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
296 && !SYMBOL_IS_ARGUMENT (nsym
))
298 /* There is a LOC_ARG/LOC_REGISTER pair. This means
299 that it was passed on the stack and loaded into a
300 register, or passed in a register and stored in a
301 stack slot. GDB 3.x used the LOC_ARG; GDB
302 4.0-4.11 used the LOC_REGISTER.
304 Reasons for using the LOC_ARG:
306 (1) Because find_saved_registers may be slow for
309 (2) Because registers are often re-used and stack
310 slots rarely (never?) are. Therefore using
311 the stack slot is much less likely to print
314 Reasons why we might want to use the LOC_REGISTER:
316 (1) So that the backtrace prints the same value
317 as "print foo". I see no compelling reason
318 why this needs to be the case; having the
319 backtrace print the value which was passed
320 in, and "print foo" print the value as
321 modified within the called function, makes
324 Additional note: It might be nice if "info args"
325 displayed both values.
327 One more note: There is a case with SPARC
328 structure passing where we need to use the
329 LOC_REGISTER, but this is dealt with by creating
330 a single LOC_REGPARM in symbol reading. */
332 /* Leave sym (the LOC_ARG) alone. */
339 /* Print the current arg. */
341 ui_out_text (uiout
, ", ");
342 ui_out_wrap_hint (uiout
, " ");
344 annotate_arg_begin ();
346 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
347 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
348 SYMBOL_LANGUAGE (sym
),
349 DMGL_PARAMS
| DMGL_ANSI
);
350 ui_out_field_stream (uiout
, "name", stb
);
351 annotate_arg_name_end ();
352 ui_out_text (uiout
, "=");
354 if (print_this_frame_argument_p (sym
))
356 /* Avoid value_print because it will deref ref parameters.
357 We just want to print their addresses. Print ??? for
358 args whose address we do not know. We pass 2 as
359 "recurse" to val_print because our standard indentation
360 here is 4 spaces, and val_print indents 2 for each
362 val
= read_var_value (sym
, frame
);
364 annotate_arg_value (val
== NULL
? NULL
: value_type (val
));
368 const struct language_defn
*language
;
370 /* Use the appropriate language to display our symbol,
371 unless the user forced the language to a specific
373 if (language_mode
== language_mode_auto
)
374 language
= language_def (SYMBOL_LANGUAGE (sym
));
376 language
= current_language
;
378 common_val_print (val
, stb
->stream
, 0, 0, 2,
379 Val_no_prettyprint
, language
);
380 ui_out_field_stream (uiout
, "value", stb
);
383 ui_out_text (uiout
, "???");
386 ui_out_text (uiout
, "...");
389 /* Invoke ui_out_tuple_end. */
390 do_cleanups (list_chain
);
398 /* Don't print nameless args in situations where we don't know
399 enough about the stack to find them. */
404 if (highest_offset
== -1)
405 start
= gdbarch_frame_args_skip (get_frame_arch (frame
));
407 start
= highest_offset
;
409 print_frame_nameless_args (frame
, start
, num
- args_printed
,
413 do_cleanups (old_chain
);
416 /* Stub for catch_errors. */
419 print_args_stub (void *args
)
421 struct print_args_args
*p
= args
;
422 struct gdbarch
*gdbarch
= get_frame_arch (p
->frame
);
425 if (gdbarch_frame_num_args_p (gdbarch
))
427 numargs
= gdbarch_frame_num_args (gdbarch
, p
->frame
);
428 gdb_assert (numargs
>= 0);
432 print_frame_args (p
->func
, p
->frame
, numargs
, p
->stream
);
436 /* Set the current source and line to the location given by frame
437 FRAME, if possible. When CENTER is true, adjust so the relevant
438 line is in the center of the next 'list'. */
441 set_current_sal_from_frame (struct frame_info
*frame
, int center
)
443 struct symtab_and_line sal
;
445 find_frame_sal (frame
, &sal
);
449 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
450 set_current_source_symtab_and_line (&sal
);
454 /* Print information about frame FRAME. The output is format according
455 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
458 SRC_LINE: Print only source line.
459 LOCATION: Print only location.
460 LOC_AND_SRC: Print location and source line.
462 Used in "where" output, and to emit breakpoint or step
466 print_frame_info (struct frame_info
*frame
, int print_level
,
467 enum print_what print_what
, int print_args
)
469 struct symtab_and_line sal
;
473 if (get_frame_type (frame
) == DUMMY_FRAME
474 || get_frame_type (frame
) == SIGTRAMP_FRAME
)
476 struct cleanup
*uiout_cleanup
477 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
479 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
480 get_frame_pc (frame
));
482 /* Do this regardless of SOURCE because we don't have any source
483 to list for this frame. */
486 ui_out_text (uiout
, "#");
487 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
488 frame_relative_level (frame
));
490 if (ui_out_is_mi_like_p (uiout
))
492 annotate_frame_address ();
493 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
494 annotate_frame_address_end ();
497 if (get_frame_type (frame
) == DUMMY_FRAME
)
499 annotate_function_call ();
500 ui_out_field_string (uiout
, "func", "<function called from gdb>");
502 else if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
504 annotate_signal_handler_caller ();
505 ui_out_field_string (uiout
, "func", "<signal handler called>");
507 ui_out_text (uiout
, "\n");
508 annotate_frame_end ();
510 do_cleanups (uiout_cleanup
);
514 /* If FRAME is not the innermost frame, that normally means that
515 FRAME->pc points to *after* the call instruction, and we want to
516 get the line containing the call, never the next line. But if
517 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
518 next frame was not entered as the result of a call, and we want
519 to get the line containing FRAME->pc. */
520 find_frame_sal (frame
, &sal
);
522 location_print
= (print_what
== LOCATION
523 || print_what
== LOC_AND_ADDRESS
524 || print_what
== SRC_AND_LOC
);
526 if (location_print
|| !sal
.symtab
)
527 print_frame (frame
, print_level
, print_what
, print_args
, sal
);
529 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
531 if (source_print
&& sal
.symtab
)
534 int mid_statement
= ((print_what
== SRC_LINE
)
535 && (get_frame_pc (frame
) != sal
.pc
));
537 if (annotation_level
)
538 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
539 get_frame_pc (frame
));
542 if (deprecated_print_frame_info_listing_hook
)
543 deprecated_print_frame_info_listing_hook (sal
.symtab
,
548 /* We used to do this earlier, but that is clearly
549 wrong. This function is used by many different
550 parts of gdb, including normal_stop in infrun.c,
551 which uses this to print out the current PC
552 when we stepi/nexti into the middle of a source
553 line. Only the command line really wants this
554 behavior. Other UIs probably would like the
555 ability to decide for themselves if it is desired. */
556 if (addressprint
&& mid_statement
)
558 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
559 ui_out_text (uiout
, "\t");
562 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
567 if (print_what
!= LOCATION
)
568 set_default_breakpoint (1, get_frame_pc (frame
), sal
.symtab
, sal
.line
);
570 annotate_frame_end ();
572 gdb_flush (gdb_stdout
);
576 print_frame (struct frame_info
*frame
, int print_level
,
577 enum print_what print_what
, int print_args
,
578 struct symtab_and_line sal
)
581 char *funname
= NULL
;
582 enum language funlang
= language_unknown
;
583 struct ui_stream
*stb
;
584 struct cleanup
*old_chain
, *list_chain
;
586 stb
= ui_out_stream_new (uiout
);
587 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
589 func
= find_pc_function (get_frame_address_in_block (frame
));
592 /* In certain pathological cases, the symtabs give the wrong
593 function (when we are in the first function in a file which
594 is compiled without debugging symbols, the previous function
595 is compiled with debugging symbols, and the "foo.o" symbol
596 that is supposed to tell us where the file with debugging
597 symbols ends has been truncated by ar because it is longer
598 than 15 characters). This also occurs if the user uses asm()
599 to create a function but not stabs for it (in a file compiled
602 So look in the minimal symbol tables as well, and if it comes
603 up with a larger address for the function use that instead.
604 I don't think this can ever cause any problems; there
605 shouldn't be any minimal symbols in the middle of a function;
606 if this is ever changed many parts of GDB will need to be
607 changed (and we'll create a find_pc_minimal_function or some
610 struct minimal_symbol
*msymbol
=
611 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
614 && (SYMBOL_VALUE_ADDRESS (msymbol
)
615 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
617 /* We also don't know anything about the function besides
618 its address and name. */
620 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
621 funlang
= SYMBOL_LANGUAGE (msymbol
);
625 funname
= DEPRECATED_SYMBOL_NAME (func
);
626 funlang
= SYMBOL_LANGUAGE (func
);
627 if (funlang
== language_cplus
)
629 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
630 to display the demangled name that we already have
631 stored in the symbol table, but we stored a version
632 with DMGL_PARAMS turned on, and here we don't want to
633 display parameters. So call the demangler again, with
636 Yes, printf_symbol_filtered() will again try to
637 demangle the name on the fly, but the issue is that
638 if cplus_demangle() fails here, it will fail there
639 too. So we want to catch the failure (where DEMANGLED
640 is NULL below) here, while we still have our hands on
641 the function symbol.) */
642 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
643 if (demangled
== NULL
)
644 /* If the demangler fails, try the demangled name from
645 the symbol table. That'll have parameters, but
646 that's preferable to displaying a mangled name. */
647 funname
= SYMBOL_PRINT_NAME (func
);
655 struct minimal_symbol
*msymbol
=
656 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
660 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
661 funlang
= SYMBOL_LANGUAGE (msymbol
);
665 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
666 get_frame_pc (frame
));
668 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
672 ui_out_text (uiout
, "#");
673 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
674 frame_relative_level (frame
));
677 if (get_frame_pc (frame
) != sal
.pc
|| !sal
.symtab
678 || print_what
== LOC_AND_ADDRESS
)
680 annotate_frame_address ();
681 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
682 annotate_frame_address_end ();
683 ui_out_text (uiout
, " in ");
685 annotate_frame_function_name ();
686 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
688 ui_out_field_stream (uiout
, "func", stb
);
689 ui_out_wrap_hint (uiout
, " ");
690 annotate_frame_args ();
692 ui_out_text (uiout
, " (");
695 struct print_args_args args
;
696 struct cleanup
*args_list_chain
;
699 args
.stream
= gdb_stdout
;
700 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
701 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ERROR
);
702 /* FIXME: ARGS must be a list. If one argument is a string it
703 will have " that will not be properly escaped. */
704 /* Invoke ui_out_tuple_end. */
705 do_cleanups (args_list_chain
);
708 ui_out_text (uiout
, ")");
709 if (sal
.symtab
&& sal
.symtab
->filename
)
711 annotate_frame_source_begin ();
712 ui_out_wrap_hint (uiout
, " ");
713 ui_out_text (uiout
, " at ");
714 annotate_frame_source_file ();
715 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
716 if (ui_out_is_mi_like_p (uiout
))
718 const char *fullname
= symtab_to_fullname (sal
.symtab
);
719 if (fullname
!= NULL
)
720 ui_out_field_string (uiout
, "fullname", fullname
);
722 annotate_frame_source_file_end ();
723 ui_out_text (uiout
, ":");
724 annotate_frame_source_line ();
725 ui_out_field_int (uiout
, "line", sal
.line
);
726 annotate_frame_source_end ();
729 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
732 char *lib
= PC_SOLIB (get_frame_pc (frame
));
734 char *lib
= solib_address (get_frame_pc (frame
));
738 annotate_frame_where ();
739 ui_out_wrap_hint (uiout
, " ");
740 ui_out_text (uiout
, " from ");
741 ui_out_field_string (uiout
, "from", lib
);
745 /* do_cleanups will call ui_out_tuple_end() for us. */
746 do_cleanups (list_chain
);
747 ui_out_text (uiout
, "\n");
748 do_cleanups (old_chain
);
752 /* Read a frame specification in whatever the appropriate format is
753 from FRAME_EXP. Call error(), printing MESSAGE, if the
754 specification is in any way invalid (so this function never returns
755 NULL). When SEPECTED_P is non-NULL set its target to indicate that
756 the default selected frame was used. */
758 static struct frame_info
*
759 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
760 int *selected_frame_p
)
763 struct value
*args
[4];
764 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
766 if (frame_exp
== NULL
)
771 struct cleanup
*tmp_cleanup
;
777 struct cleanup
*cleanup
;
780 /* Skip leading white space, bail of EOL. */
781 while (isspace (*frame_exp
))
786 /* Parse the argument, extract it, save it. */
790 addr_string
= savestring (frame_exp
, p
- frame_exp
);
792 cleanup
= make_cleanup (xfree
, addr_string
);
794 /* NOTE: Parse and evaluate expression, but do not use
795 functions such as parse_and_eval_long or
796 parse_and_eval_address to also extract the value.
797 Instead value_as_long and value_as_address are used.
798 This avoids problems with expressions that contain
800 if (numargs
>= ARRAY_SIZE (args
))
801 error (_("Too many args in frame specification"));
802 args
[numargs
++] = parse_and_eval (addr_string
);
804 do_cleanups (cleanup
);
808 /* If no args, default to the selected frame. */
811 if (selected_frame_p
!= NULL
)
812 (*selected_frame_p
) = 1;
813 return get_selected_frame (message
);
816 /* None of the remaining use the selected frame. */
817 if (selected_frame_p
!= NULL
)
818 (*selected_frame_p
) = 0;
820 /* Assume the single arg[0] is an integer, and try using that to
821 select a frame relative to current. */
824 struct frame_info
*fid
;
825 int level
= value_as_long (args
[0]);
826 fid
= find_relative_frame (get_current_frame (), &level
);
828 /* find_relative_frame was successful */
832 /* Convert each value into a corresponding address. */
835 for (i
= 0; i
< numargs
; i
++)
836 addrs
[i
] = value_as_address (args
[0]);
839 /* Assume that the single arg[0] is an address, use that to identify
840 a frame with a matching ID. Should this also accept stack/pc or
844 struct frame_id id
= frame_id_build_wild (addrs
[0]);
845 struct frame_info
*fid
;
847 /* If (s)he specifies the frame with an address, he deserves
848 what (s)he gets. Still, give the highest one that matches.
849 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
851 for (fid
= get_current_frame ();
853 fid
= get_prev_frame (fid
))
855 if (frame_id_eq (id
, get_frame_id (fid
)))
857 while (frame_id_eq (id
, frame_unwind_id (fid
)))
858 fid
= get_prev_frame (fid
);
864 /* We couldn't identify the frame as an existing frame, but
865 perhaps we can create one with a single argument. */
867 return create_new_frame (addrs
[0], 0);
868 else if (numargs
== 2)
869 return create_new_frame (addrs
[0], addrs
[1]);
871 error (_("Too many args in frame specification"));
874 static struct frame_info
*
875 parse_frame_specification (char *frame_exp
)
877 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
880 /* Print verbosely the selected frame or the frame at address
881 ADDR_EXP. Absolutely all information in the frame is printed. */
884 frame_info (char *addr_exp
, int from_tty
)
886 struct frame_info
*fi
;
887 struct symtab_and_line sal
;
890 struct frame_info
*calling_frame_info
;
891 int i
, count
, numregs
;
893 enum language funlang
= language_unknown
;
894 const char *pc_regname
;
895 int selected_frame_p
;
896 struct gdbarch
*gdbarch
;
898 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
899 gdbarch
= get_frame_arch (fi
);
901 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
902 is not a good name. */
903 if (gdbarch_pc_regnum (gdbarch
) >= 0)
904 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
905 easily not match that of the internal value returned by
907 pc_regname
= gdbarch_register_name (gdbarch
, gdbarch_pc_regnum (gdbarch
));
909 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
910 architectures will often have a hardware register called "pc",
911 and that register's value, again, can easily not match
915 find_frame_sal (fi
, &sal
);
916 func
= get_frame_function (fi
);
917 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
919 s
= find_pc_symtab (get_frame_pc (fi
));
922 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
923 display the demangled name that we already have stored in the
924 symbol table, but we stored a version with DMGL_PARAMS turned
925 on, and here we don't want to display parameters. So call the
926 demangler again, with DMGL_ANSI only.
928 Yes, printf_symbol_filtered() will again try to demangle the
929 name on the fly, but the issue is that if cplus_demangle()
930 fails here, it will fail there too. So we want to catch the
931 failure (where DEMANGLED is NULL below) here, while we still
932 have our hands on the function symbol.) */
933 funname
= DEPRECATED_SYMBOL_NAME (func
);
934 funlang
= SYMBOL_LANGUAGE (func
);
935 if (funlang
== language_cplus
)
937 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
938 /* If the demangler fails, try the demangled name from the
939 symbol table. That'll have parameters, but that's
940 preferable to displaying a mangled name. */
941 if (demangled
== NULL
)
942 funname
= SYMBOL_PRINT_NAME (func
);
949 struct minimal_symbol
*msymbol
;
951 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
954 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
955 funlang
= SYMBOL_LANGUAGE (msymbol
);
958 calling_frame_info
= get_prev_frame (fi
);
960 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
962 printf_filtered (_("Stack level %d, frame at "),
963 frame_relative_level (fi
));
967 printf_filtered (_("Stack frame at "));
969 fputs_filtered (paddress (get_frame_base (fi
)), gdb_stdout
);
970 printf_filtered (":\n");
971 printf_filtered (" %s = ", pc_regname
);
972 fputs_filtered (paddress (get_frame_pc (fi
)), gdb_stdout
);
977 printf_filtered (" in ");
978 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
979 DMGL_ANSI
| DMGL_PARAMS
);
983 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
984 puts_filtered ("; ");
986 printf_filtered ("saved %s ", pc_regname
);
987 fputs_filtered (paddress (frame_pc_unwind (fi
)), gdb_stdout
);
988 printf_filtered ("\n");
990 if (calling_frame_info
== NULL
)
992 enum unwind_stop_reason reason
;
994 reason
= get_frame_unwind_stop_reason (fi
);
995 if (reason
!= UNWIND_NO_REASON
)
996 printf_filtered (_(" Outermost frame: %s\n"),
997 frame_stop_reason_string (reason
));
1000 if (calling_frame_info
)
1002 printf_filtered (" called by frame at ");
1003 fputs_filtered (paddress (get_frame_base (calling_frame_info
)),
1006 if (get_next_frame (fi
) && calling_frame_info
)
1007 puts_filtered (",");
1009 if (get_next_frame (fi
))
1011 printf_filtered (" caller of frame at ");
1012 fputs_filtered (paddress (get_frame_base (get_next_frame (fi
))),
1015 if (get_next_frame (fi
) || calling_frame_info
)
1016 puts_filtered ("\n");
1019 printf_filtered (" source language %s.\n",
1020 language_str (s
->language
));
1023 /* Address of the argument list for this frame, or 0. */
1024 CORE_ADDR arg_list
= get_frame_args_address (fi
);
1025 /* Number of args for this frame, or -1 if unknown. */
1029 printf_filtered (" Arglist at unknown address.\n");
1032 printf_filtered (" Arglist at ");
1033 fputs_filtered (paddress (arg_list
), gdb_stdout
);
1034 printf_filtered (",");
1036 if (!gdbarch_frame_num_args_p (gdbarch
))
1039 puts_filtered (" args: ");
1043 numargs
= gdbarch_frame_num_args (gdbarch
, fi
);
1044 gdb_assert (numargs
>= 0);
1046 puts_filtered (" no args.");
1047 else if (numargs
== 1)
1048 puts_filtered (" 1 arg: ");
1050 printf_filtered (" %d args: ", numargs
);
1052 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1053 puts_filtered ("\n");
1057 /* Address of the local variables for this frame, or 0. */
1058 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1061 printf_filtered (" Locals at unknown address,");
1064 printf_filtered (" Locals at ");
1065 fputs_filtered (paddress (arg_list
), gdb_stdout
);
1066 printf_filtered (",");
1070 /* Print as much information as possible on the location of all the
1073 enum lval_type lval
;
1081 /* The sp is special; what's displayed isn't the save address, but
1082 the value of the previous frame's sp. This is a legacy thing,
1083 at one stage the frame cached the previous frame's SP instead
1084 of its address, hence it was easiest to just display the cached
1086 if (gdbarch_sp_regnum (gdbarch
) >= 0)
1088 /* Find out the location of the saved stack pointer with out
1089 actually evaluating it. */
1090 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1091 &optimized
, &lval
, &addr
,
1093 if (!optimized
&& lval
== not_lval
)
1095 gdb_byte value
[MAX_REGISTER_SIZE
];
1097 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1098 &optimized
, &lval
, &addr
,
1100 /* NOTE: cagney/2003-05-22: This is assuming that the
1101 stack pointer was packed as an unsigned integer. That
1102 may or may not be valid. */
1103 sp
= extract_unsigned_integer (value
,
1104 register_size (gdbarch
,
1105 gdbarch_sp_regnum (gdbarch
)));
1106 printf_filtered (" Previous frame's sp is ");
1107 fputs_filtered (paddress (sp
), gdb_stdout
);
1108 printf_filtered ("\n");
1111 else if (!optimized
&& lval
== lval_memory
)
1113 printf_filtered (" Previous frame's sp at ");
1114 fputs_filtered (paddress (addr
), gdb_stdout
);
1115 printf_filtered ("\n");
1118 else if (!optimized
&& lval
== lval_register
)
1120 printf_filtered (" Previous frame's sp in %s\n",
1121 gdbarch_register_name (gdbarch
, realnum
));
1124 /* else keep quiet. */
1128 numregs
= gdbarch_num_regs (gdbarch
)
1129 + gdbarch_num_pseudo_regs (gdbarch
);
1130 for (i
= 0; i
< numregs
; i
++)
1131 if (i
!= gdbarch_sp_regnum (gdbarch
)
1132 && gdbarch_register_reggroup_p (gdbarch
, i
, all_reggroup
))
1134 /* Find out the location of the saved register without
1135 fetching the corresponding value. */
1136 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1138 /* For moment, only display registers that were saved on the
1140 if (!optimized
&& lval
== lval_memory
)
1143 puts_filtered (" Saved registers:\n ");
1145 puts_filtered (",");
1147 printf_filtered (" %s at ",
1148 gdbarch_register_name (gdbarch
, i
));
1149 fputs_filtered (paddress (addr
), gdb_stdout
);
1153 if (count
|| need_nl
)
1154 puts_filtered ("\n");
1158 /* Print briefly all stack frames or just the innermost COUNT_EXP
1162 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1164 struct frame_info
*fi
;
1167 struct frame_info
*trailing
;
1170 if (!target_has_stack
)
1171 error (_("No stack."));
1173 /* The following code must do two things. First, it must set the
1174 variable TRAILING to the frame from which we should start
1175 printing. Second, it must set the variable count to the number
1176 of frames which we should print, or -1 if all of them. */
1177 trailing
= get_current_frame ();
1179 /* The target can be in a state where there is no valid frames
1180 (e.g., just connected). */
1181 if (trailing
== NULL
)
1182 error (_("No stack."));
1187 count
= parse_and_eval_long (count_exp
);
1190 struct frame_info
*current
;
1195 while (current
&& count
--)
1198 current
= get_prev_frame (current
);
1201 /* Will stop when CURRENT reaches the top of the stack.
1202 TRAILING will be COUNT below it. */
1206 trailing
= get_prev_frame (trailing
);
1207 current
= get_prev_frame (current
);
1219 struct partial_symtab
*ps
;
1221 /* Read in symbols for all of the frames. Need to do this in a
1222 separate pass so that "Reading in symbols for xxx" messages
1223 don't screw up the appearance of the backtrace. Also if
1224 people have strong opinions against reading symbols for
1225 backtrace this may have to be an option. */
1227 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1230 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1232 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1236 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1240 /* Don't use print_stack_frame; if an error() occurs it probably
1241 means further attempts to backtrace would fail (on the other
1242 hand, perhaps the code does or could be fixed to make sure
1243 the frame->prev field gets set to NULL in that case). */
1244 print_frame_info (fi
, 1, LOCATION
, 1);
1246 print_frame_local_vars (fi
, 1, gdb_stdout
);
1248 /* Save the last frame to check for error conditions. */
1252 /* If we've stopped before the end, mention that. */
1254 printf_filtered (_("(More stack frames follow...)\n"));
1256 /* If we've run out of frames, and the reason appears to be an error
1257 condition, print it. */
1258 if (fi
== NULL
&& trailing
!= NULL
)
1260 enum unwind_stop_reason reason
;
1262 reason
= get_frame_unwind_stop_reason (trailing
);
1263 if (reason
> UNWIND_FIRST_ERROR
)
1264 printf_filtered (_("Backtrace stopped: %s\n"),
1265 frame_stop_reason_string (reason
));
1269 struct backtrace_command_args
1276 /* Stub for catch_errors. */
1279 backtrace_command_stub (void *data
)
1281 struct backtrace_command_args
*args
= data
;
1282 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1287 backtrace_command (char *arg
, int from_tty
)
1289 struct cleanup
*old_chain
= NULL
;
1290 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1291 struct backtrace_command_args btargs
;
1298 argv
= buildargv (arg
);
1299 old_chain
= make_cleanup_freeargv (argv
);
1301 for (i
= 0; argv
[i
]; i
++)
1305 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1306 argv
[i
][j
] = tolower (argv
[i
][j
]);
1308 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1309 fulltrace_arg
= argc
;
1312 arglen
+= strlen (argv
[i
]);
1317 if (fulltrace_arg
>= 0)
1321 arg
= xmalloc (arglen
+ 1);
1322 memset (arg
, 0, arglen
+ 1);
1323 for (i
= 0; i
< (argc
+ 1); i
++)
1325 if (i
!= fulltrace_arg
)
1327 strcat (arg
, argv
[i
]);
1337 btargs
.count_exp
= arg
;
1338 btargs
.show_locals
= (fulltrace_arg
>= 0);
1339 btargs
.from_tty
= from_tty
;
1340 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1342 if (fulltrace_arg
>= 0 && arglen
> 0)
1346 do_cleanups (old_chain
);
1350 backtrace_full_command (char *arg
, int from_tty
)
1352 struct backtrace_command_args btargs
;
1353 btargs
.count_exp
= arg
;
1354 btargs
.show_locals
= 1;
1355 btargs
.from_tty
= from_tty
;
1356 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1360 /* Print the local variables of a block B active in FRAME on STREAM.
1361 Return 1 if any variables were printed; 0 otherwise. */
1364 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1365 int num_tabs
, struct ui_file
*stream
)
1367 struct dict_iterator iter
;
1369 int values_printed
= 0;
1372 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1374 switch (SYMBOL_CLASS (sym
))
1380 if (SYMBOL_IS_ARGUMENT (sym
))
1383 for (j
= 0; j
< num_tabs
; j
++)
1384 fputs_filtered ("\t", stream
);
1385 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1386 fputs_filtered (" = ", stream
);
1387 print_variable_value (sym
, frame
, stream
);
1388 fprintf_filtered (stream
, "\n");
1392 /* Ignore symbols which are not locals. */
1397 return values_printed
;
1400 /* Same, but print labels. */
1403 print_block_frame_labels (struct block
*b
, int *have_default
,
1404 struct ui_file
*stream
)
1406 struct dict_iterator iter
;
1408 int values_printed
= 0;
1410 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1412 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1418 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1420 struct symtab_and_line sal
;
1421 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1423 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1426 fprintf_filtered (stream
, " ");
1427 fputs_filtered (paddress (SYMBOL_VALUE_ADDRESS (sym
)), stream
);
1429 fprintf_filtered (stream
, " in file %s, line %d\n",
1430 sal
.symtab
->filename
, sal
.line
);
1434 return values_printed
;
1437 /* Print on STREAM all the local variables in frame FRAME, including
1438 all the blocks active in that frame at its current PC.
1440 Returns 1 if the job was done, or 0 if nothing was printed because
1441 we have no info on the function running in FRAME. */
1444 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1445 struct ui_file
*stream
)
1447 struct block
*block
= get_frame_block (frame
, 0);
1448 int values_printed
= 0;
1452 fprintf_filtered (stream
, "No symbol table info available.\n");
1458 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1460 /* After handling the function's top-level block, stop. Don't
1461 continue to its superblock, the block of per-file symbols. */
1462 if (BLOCK_FUNCTION (block
))
1464 block
= BLOCK_SUPERBLOCK (block
);
1467 if (!values_printed
)
1468 fprintf_filtered (stream
, _("No locals.\n"));
1471 /* Same, but print labels. */
1474 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1475 struct ui_file
*stream
)
1478 fprintf_filtered (stream
, "print_frame_label_vars disabled.\n");
1480 struct blockvector
*bl
;
1481 struct block
*block
= get_frame_block (frame
, 0);
1482 int values_printed
= 0;
1483 int index
, have_default
= 0;
1484 char *blocks_printed
;
1485 CORE_ADDR pc
= get_frame_pc (frame
);
1489 fprintf_filtered (stream
, "No symbol table info available.\n");
1493 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1494 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1495 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1499 CORE_ADDR end
= BLOCK_END (block
) - 4;
1502 if (bl
!= blockvector_for_pc (end
, &index
))
1503 error (_("blockvector blotch"));
1504 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1505 error (_("blockvector botch"));
1506 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1509 /* Don't print out blocks that have gone by. */
1510 while (index
< last_index
1511 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1514 while (index
< last_index
1515 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1517 if (blocks_printed
[index
] == 0)
1519 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1520 &have_default
, stream
))
1522 blocks_printed
[index
] = 1;
1528 if (values_printed
&& this_level_only
)
1531 /* After handling the function's top-level block, stop. Don't
1532 continue to its superblock, the block of per-file symbols. */
1533 if (BLOCK_FUNCTION (block
))
1535 block
= BLOCK_SUPERBLOCK (block
);
1538 if (!values_printed
&& !this_level_only
)
1539 fprintf_filtered (stream
, _("No catches.\n"));
1544 locals_info (char *args
, int from_tty
)
1546 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1551 catch_info (char *ignore
, int from_tty
)
1553 struct symtab_and_line
*sal
;
1555 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1556 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1561 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1563 struct symbol
*func
= get_frame_function (frame
);
1565 struct dict_iterator iter
;
1566 struct symbol
*sym
, *sym2
;
1567 int values_printed
= 0;
1571 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1575 b
= SYMBOL_BLOCK_VALUE (func
);
1576 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1578 /* Don't worry about things which aren't arguments. */
1579 if (SYMBOL_IS_ARGUMENT (sym
))
1582 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1583 fputs_filtered (" = ", stream
);
1585 /* We have to look up the symbol because arguments can have
1586 two entries (one a parameter, one a local) and the one we
1587 want is the local, which lookup_symbol will find for us.
1588 This includes gcc1 (not gcc2) on the sparc when passing a
1589 small structure and gcc2 when the argument type is float
1590 and it is passed as a double and converted to float by
1591 the prologue (in the latter case the type of the LOC_ARG
1592 symbol is double and the type of the LOC_LOCAL symbol is
1593 float). There are also LOC_ARG/LOC_REGISTER pairs which
1594 are not combined in symbol-reading. */
1596 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1597 b
, VAR_DOMAIN
, NULL
);
1598 print_variable_value (sym2
, frame
, stream
);
1599 fprintf_filtered (stream
, "\n");
1603 if (!values_printed
)
1604 fprintf_filtered (stream
, _("No arguments.\n"));
1608 args_info (char *ignore
, int from_tty
)
1610 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1616 args_plus_locals_info (char *ignore
, int from_tty
)
1618 args_info (ignore
, from_tty
);
1619 locals_info (ignore
, from_tty
);
1623 /* Select frame FRAME. Also print the stack frame and show the source
1624 if this is the tui version. */
1626 select_and_print_frame (struct frame_info
*frame
)
1628 select_frame (frame
);
1630 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1633 /* Return the symbol-block in which the selected frame is executing.
1634 Can return zero under various legitimate circumstances.
1636 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1637 code address within the block returned. We use this to decide
1638 which macros are in scope. */
1641 get_selected_block (CORE_ADDR
*addr_in_block
)
1643 if (!target_has_stack
)
1646 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1649 /* Find a frame a certain number of levels away from FRAME.
1650 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1651 Positive means go to earlier frames (up); negative, the reverse.
1652 The int that contains the number of levels is counted toward
1653 zero as the frames for those levels are found.
1654 If the top or bottom frame is reached, that frame is returned,
1655 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1656 how much farther the original request asked to go. */
1659 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1661 /* Going up is simple: just call get_prev_frame enough times or
1662 until the initial frame is reached. */
1663 while (*level_offset_ptr
> 0)
1665 struct frame_info
*prev
= get_prev_frame (frame
);
1668 (*level_offset_ptr
)--;
1672 /* Going down is just as simple. */
1673 while (*level_offset_ptr
< 0)
1675 struct frame_info
*next
= get_next_frame (frame
);
1678 (*level_offset_ptr
)++;
1685 /* The "select_frame" command. With no argument this is a NOP.
1686 Select the frame at level LEVEL_EXP if it is a valid level.
1687 Otherwise, treat LEVEL_EXP as an address expression and select it.
1689 See parse_frame_specification for more info on proper frame
1693 select_frame_command (char *level_exp
, int from_tty
)
1695 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1698 /* The "frame" command. With no argument, print the selected frame
1699 briefly. With an argument, behave like select_frame and then print
1700 the selected frame. */
1703 frame_command (char *level_exp
, int from_tty
)
1705 select_frame_command (level_exp
, from_tty
);
1706 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1709 /* The XDB Compatibility command to print the current frame. */
1712 current_frame_command (char *level_exp
, int from_tty
)
1714 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1717 /* Select the frame up one or COUNT_EXP stack levels from the
1718 previously selected frame, and print it briefly. */
1721 up_silently_base (char *count_exp
)
1723 struct frame_info
*frame
;
1727 count
= parse_and_eval_long (count_exp
);
1729 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1730 if (count
!= 0 && count_exp
== NULL
)
1731 error (_("Initial frame selected; you cannot go up."));
1732 select_frame (frame
);
1736 up_silently_command (char *count_exp
, int from_tty
)
1738 up_silently_base (count_exp
);
1742 up_command (char *count_exp
, int from_tty
)
1744 up_silently_base (count_exp
);
1745 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1748 /* Select the frame down one or COUNT_EXP stack levels from the previously
1749 selected frame, and print it briefly. */
1752 down_silently_base (char *count_exp
)
1754 struct frame_info
*frame
;
1757 count
= -parse_and_eval_long (count_exp
);
1759 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1760 if (count
!= 0 && count_exp
== NULL
)
1762 /* We only do this if COUNT_EXP is not specified. That way
1763 "down" 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
1765 way down without getting an error. */
1767 error (_("Bottom (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
);
1788 return_command (char *retval_exp
, int from_tty
)
1790 struct symbol
*thisfun
;
1791 struct value
*return_value
= NULL
;
1792 const char *query_prefix
= "";
1794 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1796 /* Compute the return value. If the computation triggers an error,
1797 let it bail. If the return type can't be handled, set
1798 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1802 struct type
*return_type
= NULL
;
1804 /* Compute the return value. Should the computation fail, this
1805 call throws an error. */
1806 return_value
= parse_and_eval (retval_exp
);
1808 /* Cast return value to the return type of the function. Should
1809 the cast fail, this call throws an error. */
1810 if (thisfun
!= NULL
)
1811 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1812 if (return_type
== NULL
)
1813 return_type
= builtin_type_int
;
1814 CHECK_TYPEDEF (return_type
);
1815 return_value
= value_cast (return_type
, return_value
);
1817 /* Make sure the value is fully evaluated. It may live in the
1818 stack frame we're about to pop. */
1819 if (value_lazy (return_value
))
1820 value_fetch_lazy (return_value
);
1822 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1823 /* If the return-type is "void", don't try to find the
1824 return-value's location. However, do still evaluate the
1825 return expression so that, even when the expression result
1826 is discarded, side effects such as "return i++" still
1828 return_value
= NULL
;
1829 else if (using_struct_return (SYMBOL_TYPE (thisfun
), return_type
))
1832 The location at which to store the function's return value is unknown.\n\
1833 If you continue, the return value that you specified will be ignored.\n";
1834 return_value
= NULL
;
1838 /* Does an interactive user really want to do this? Include
1839 information, such as how well GDB can handle the return value, in
1840 the query message. */
1844 if (thisfun
== NULL
)
1845 confirmed
= query (_("%sMake selected stack frame return now? "),
1848 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1849 SYMBOL_PRINT_NAME (thisfun
));
1851 error (_("Not confirmed"));
1854 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1855 frame in turn, should this code just go straight to the relevant
1856 frame and pop that? */
1858 /* First discard all frames inner-to the selected frame (making the
1859 selected frame current). */
1861 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1862 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1864 struct frame_info
*frame
= get_current_frame ();
1865 if (frame_id_inner (get_frame_arch (frame
), selected_id
,
1866 get_frame_id (frame
)))
1867 /* Caught in the safety net, oops! We've gone way past the
1869 error (_("Problem while popping stack frames (corrupt stack?)"));
1870 frame_pop (get_current_frame ());
1874 /* Second discard the selected frame (which is now also the current
1876 frame_pop (get_current_frame ());
1878 /* Store RETURN_VALUE in the just-returned register set. */
1879 if (return_value
!= NULL
)
1881 struct type
*return_type
= value_type (return_value
);
1882 struct gdbarch
*gdbarch
= get_regcache_arch (get_current_regcache ());
1883 gdb_assert (gdbarch_return_value (gdbarch
, SYMBOL_TYPE (thisfun
),
1884 return_type
, NULL
, NULL
, NULL
)
1885 == RETURN_VALUE_REGISTER_CONVENTION
);
1886 gdbarch_return_value (gdbarch
, SYMBOL_TYPE (thisfun
), return_type
,
1887 get_current_regcache (), NULL
/*read*/,
1888 value_contents (return_value
) /*write*/);
1891 /* If we are at the end of a call dummy now, pop the dummy frame
1893 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1894 frame_pop (get_current_frame ());
1896 /* If interactive, print the frame that is now current. */
1898 frame_command ("0", 1);
1900 select_frame_command ("0", 0);
1903 /* Sets the scope to input function name, provided that the function
1904 is within the current stack frame */
1906 struct function_bounds
1908 CORE_ADDR low
, high
;
1912 func_command (char *arg
, int from_tty
)
1914 struct frame_info
*frame
;
1916 struct symtabs_and_lines sals
;
1919 struct function_bounds
*func_bounds
= NULL
;
1924 frame
= parse_frame_specification ("0");
1925 sals
= decode_line_spec (arg
, 1);
1926 func_bounds
= (struct function_bounds
*) xmalloc (
1927 sizeof (struct function_bounds
) * sals
.nelts
);
1928 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1930 if (sals
.sals
[i
].pc
== 0
1931 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1932 &func_bounds
[i
].low
,
1933 &func_bounds
[i
].high
) == 0)
1935 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1941 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1942 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1943 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1947 frame
= find_relative_frame (frame
, &level
);
1950 while (!found
&& level
== 0);
1953 xfree (func_bounds
);
1956 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1957 else if (frame
!= get_selected_frame (NULL
))
1958 select_and_print_frame (frame
);
1961 /* Gets the language of the current frame. */
1964 get_frame_language (void)
1966 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1970 /* We determine the current frame language by looking up its
1971 associated symtab. To retrieve this symtab, we use the frame
1972 PC. However we cannot use the frame PC as is, because it
1973 usually points to the instruction following the "call", which
1974 is sometimes the first instruction of another function. So
1975 we rely on get_frame_address_in_block(), it provides us with
1976 a PC that is guaranteed to be inside the frame's code
1978 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1979 struct symtab
*s
= find_pc_symtab (pc
);
1985 return language_unknown
;
1989 /* Provide a prototype to silence -Wmissing-prototypes. */
1990 void _initialize_stack (void);
1993 _initialize_stack (void)
1996 backtrace_limit
= 30;
1999 add_com ("return", class_stack
, return_command
, _("\
2000 Make selected stack frame return to its caller.\n\
2001 Control remains in the debugger, but when you continue\n\
2002 execution will resume in the frame above the one now selected.\n\
2003 If an argument is given, it is an expression for the value to return."));
2005 add_com ("up", class_stack
, up_command
, _("\
2006 Select and print stack frame that called this one.\n\
2007 An argument says how many frames up to go."));
2008 add_com ("up-silently", class_support
, up_silently_command
, _("\
2009 Same as the `up' command, but does not print anything.\n\
2010 This is useful in command scripts."));
2012 add_com ("down", class_stack
, down_command
, _("\
2013 Select and print stack frame called by this one.\n\
2014 An argument says how many frames down to go."));
2015 add_com_alias ("do", "down", class_stack
, 1);
2016 add_com_alias ("dow", "down", class_stack
, 1);
2017 add_com ("down-silently", class_support
, down_silently_command
, _("\
2018 Same as the `down' command, but does not print anything.\n\
2019 This is useful in command scripts."));
2021 add_com ("frame", class_stack
, frame_command
, _("\
2022 Select and print a stack frame.\n\
2023 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2024 An argument specifies the frame to select.\n\
2025 It can be a stack frame number or the address of the frame.\n\
2026 With argument, nothing is printed if input is coming from\n\
2027 a command file or a user-defined command."));
2029 add_com_alias ("f", "frame", class_stack
, 1);
2033 add_com ("L", class_stack
, current_frame_command
,
2034 _("Print the current stack frame.\n"));
2035 add_com_alias ("V", "frame", class_stack
, 1);
2037 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2038 Select a stack frame without printing anything.\n\
2039 An argument specifies the frame to select.\n\
2040 It can be a stack frame number or the address of the frame.\n"));
2042 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2043 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2044 With a negative argument, print outermost -COUNT frames.\n\
2045 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2046 add_com_alias ("bt", "backtrace", class_stack
, 0);
2049 add_com_alias ("t", "backtrace", class_stack
, 0);
2050 add_com ("T", class_stack
, backtrace_full_command
, _("\
2051 Print backtrace of all stack frames, or innermost COUNT frames \n\
2052 and the values of the local variables.\n\
2053 With a negative argument, print outermost -COUNT frames.\n\
2054 Usage: T <count>\n"));
2057 add_com_alias ("where", "backtrace", class_alias
, 0);
2058 add_info ("stack", backtrace_command
,
2059 _("Backtrace of the stack, or innermost COUNT frames."));
2060 add_info_alias ("s", "stack", 1);
2061 add_info ("frame", frame_info
,
2062 _("All about selected stack frame, or frame at ADDR."));
2063 add_info_alias ("f", "frame", 1);
2064 add_info ("locals", locals_info
,
2065 _("Local variables of current stack frame."));
2066 add_info ("args", args_info
,
2067 _("Argument variables of current stack frame."));
2069 add_com ("l", class_info
, args_plus_locals_info
,
2070 _("Argument and local variables of current stack frame."));
2073 add_com ("func", class_stack
, func_command
, _("\
2074 Select the stack frame that contains <func>.\n\
2075 Usage: func <name>\n"));
2077 add_info ("catch", catch_info
,
2078 _("Exceptions that can be caught in the current stack frame."));
2080 add_setshow_enum_cmd ("frame-arguments", class_stack
,
2081 print_frame_arguments_choices
, &print_frame_arguments
,
2082 _("Set printing of non-scalar frame arguments"),
2083 _("Show printing of non-scalar frame arguments"),
2084 NULL
, NULL
, NULL
, &setprintlist
, &showprintlist
);
2087 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2088 "Specify maximum number of frames for \"backtrace\" to print by default."),
2090 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2091 The maximum number of frames for \"backtrace\" to print by default."));