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 switch (SYMBOL_CLASS (sym
))
243 long current_offset
= SYMBOL_VALUE (sym
);
244 int arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
246 /* Compute address of next argument by adding the size of
247 this argument and rounding to an int boundary. */
249 ((current_offset
+ arg_size
+ sizeof (int) - 1)
250 & ~(sizeof (int) - 1));
252 /* If this is the highest offset seen yet, set
254 if (highest_offset
== -1
255 || (current_offset
> highest_offset
))
256 highest_offset
= current_offset
;
258 /* Add the number of ints we're about to print to
260 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
263 /* We care about types of symbols, but don't need to
264 keep track of stack offsets in them. */
266 case LOC_REGPARM_ADDR
:
267 case LOC_BASEREG_ARG
:
268 case LOC_COMPUTED_ARG
:
271 /* Other types of symbols we just skip over. */
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
)
297 /* There is a LOC_ARG/LOC_REGISTER pair. This means
298 that it was passed on the stack and loaded into a
299 register, or passed in a register and stored in a
300 stack slot. GDB 3.x used the LOC_ARG; GDB
301 4.0-4.11 used the LOC_REGISTER.
303 Reasons for using the LOC_ARG:
305 (1) Because find_saved_registers may be slow for
308 (2) Because registers are often re-used and stack
309 slots rarely (never?) are. Therefore using
310 the stack slot is much less likely to print
313 Reasons why we might want to use the LOC_REGISTER:
315 (1) So that the backtrace prints the same value
316 as "print foo". I see no compelling reason
317 why this needs to be the case; having the
318 backtrace print the value which was passed
319 in, and "print foo" print the value as
320 modified within the called function, makes
323 Additional note: It might be nice if "info args"
324 displayed both values.
326 One more note: There is a case with SPARC
327 structure passing where we need to use the
328 LOC_REGISTER, but this is dealt with by creating
329 a single LOC_REGPARM in symbol reading. */
331 /* Leave sym (the LOC_ARG) alone. */
338 /* Print the current arg. */
340 ui_out_text (uiout
, ", ");
341 ui_out_wrap_hint (uiout
, " ");
343 annotate_arg_begin ();
345 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
346 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
347 SYMBOL_LANGUAGE (sym
),
348 DMGL_PARAMS
| DMGL_ANSI
);
349 ui_out_field_stream (uiout
, "name", stb
);
350 annotate_arg_name_end ();
351 ui_out_text (uiout
, "=");
353 if (print_this_frame_argument_p (sym
))
355 /* Avoid value_print because it will deref ref parameters.
356 We just want to print their addresses. Print ??? for
357 args whose address we do not know. We pass 2 as
358 "recurse" to val_print because our standard indentation
359 here is 4 spaces, and val_print indents 2 for each
361 val
= read_var_value (sym
, frame
);
363 annotate_arg_value (val
== NULL
? NULL
: value_type (val
));
367 const struct language_defn
*language
;
369 /* Use the appropriate language to display our symbol,
370 unless the user forced the language to a specific
372 if (language_mode
== language_mode_auto
)
373 language
= language_def (SYMBOL_LANGUAGE (sym
));
375 language
= current_language
;
377 common_val_print (val
, stb
->stream
, 0, 0, 2,
378 Val_no_prettyprint
, language
);
379 ui_out_field_stream (uiout
, "value", stb
);
382 ui_out_text (uiout
, "???");
385 ui_out_text (uiout
, "...");
388 /* Invoke ui_out_tuple_end. */
389 do_cleanups (list_chain
);
397 /* Don't print nameless args in situations where we don't know
398 enough about the stack to find them. */
403 if (highest_offset
== -1)
404 start
= gdbarch_frame_args_skip (get_frame_arch (frame
));
406 start
= highest_offset
;
408 print_frame_nameless_args (frame
, start
, num
- args_printed
,
412 do_cleanups (old_chain
);
415 /* Stub for catch_errors. */
418 print_args_stub (void *args
)
420 struct print_args_args
*p
= args
;
421 struct gdbarch
*gdbarch
= get_frame_arch (p
->frame
);
424 if (gdbarch_frame_num_args_p (gdbarch
))
426 numargs
= gdbarch_frame_num_args (gdbarch
, p
->frame
);
427 gdb_assert (numargs
>= 0);
431 print_frame_args (p
->func
, p
->frame
, numargs
, p
->stream
);
435 /* Set the current source and line to the location given by frame
436 FRAME, if possible. When CENTER is true, adjust so the relevant
437 line is in the center of the next 'list'. */
440 set_current_sal_from_frame (struct frame_info
*frame
, int center
)
442 struct symtab_and_line sal
;
444 find_frame_sal (frame
, &sal
);
448 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
449 set_current_source_symtab_and_line (&sal
);
453 /* Print information about frame FRAME. The output is format according
454 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
457 SRC_LINE: Print only source line.
458 LOCATION: Print only location.
459 LOC_AND_SRC: Print location and source line.
461 Used in "where" output, and to emit breakpoint or step
465 print_frame_info (struct frame_info
*frame
, int print_level
,
466 enum print_what print_what
, int print_args
)
468 struct symtab_and_line sal
;
472 if (get_frame_type (frame
) == DUMMY_FRAME
473 || get_frame_type (frame
) == SIGTRAMP_FRAME
)
475 struct cleanup
*uiout_cleanup
476 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
478 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
479 get_frame_pc (frame
));
481 /* Do this regardless of SOURCE because we don't have any source
482 to list for this frame. */
485 ui_out_text (uiout
, "#");
486 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
487 frame_relative_level (frame
));
489 if (ui_out_is_mi_like_p (uiout
))
491 annotate_frame_address ();
492 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
493 annotate_frame_address_end ();
496 if (get_frame_type (frame
) == DUMMY_FRAME
)
498 annotate_function_call ();
499 ui_out_field_string (uiout
, "func", "<function called from gdb>");
501 else if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
503 annotate_signal_handler_caller ();
504 ui_out_field_string (uiout
, "func", "<signal handler called>");
506 ui_out_text (uiout
, "\n");
507 annotate_frame_end ();
509 do_cleanups (uiout_cleanup
);
513 /* If FRAME is not the innermost frame, that normally means that
514 FRAME->pc points to *after* the call instruction, and we want to
515 get the line containing the call, never the next line. But if
516 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
517 next frame was not entered as the result of a call, and we want
518 to get the line containing FRAME->pc. */
519 find_frame_sal (frame
, &sal
);
521 location_print
= (print_what
== LOCATION
522 || print_what
== LOC_AND_ADDRESS
523 || print_what
== SRC_AND_LOC
);
525 if (location_print
|| !sal
.symtab
)
526 print_frame (frame
, print_level
, print_what
, print_args
, sal
);
528 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
530 if (source_print
&& sal
.symtab
)
533 int mid_statement
= ((print_what
== SRC_LINE
)
534 && (get_frame_pc (frame
) != sal
.pc
));
536 if (annotation_level
)
537 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
538 get_frame_pc (frame
));
541 if (deprecated_print_frame_info_listing_hook
)
542 deprecated_print_frame_info_listing_hook (sal
.symtab
,
547 /* We used to do this earlier, but that is clearly
548 wrong. This function is used by many different
549 parts of gdb, including normal_stop in infrun.c,
550 which uses this to print out the current PC
551 when we stepi/nexti into the middle of a source
552 line. Only the command line really wants this
553 behavior. Other UIs probably would like the
554 ability to decide for themselves if it is desired. */
555 if (addressprint
&& mid_statement
)
557 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
558 ui_out_text (uiout
, "\t");
561 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
566 if (print_what
!= LOCATION
)
567 set_default_breakpoint (1, get_frame_pc (frame
), sal
.symtab
, sal
.line
);
569 annotate_frame_end ();
571 gdb_flush (gdb_stdout
);
575 print_frame (struct frame_info
*frame
, int print_level
,
576 enum print_what print_what
, int print_args
,
577 struct symtab_and_line sal
)
580 char *funname
= NULL
;
581 enum language funlang
= language_unknown
;
582 struct ui_stream
*stb
;
583 struct cleanup
*old_chain
, *list_chain
;
585 stb
= ui_out_stream_new (uiout
);
586 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
588 func
= find_pc_function (get_frame_address_in_block (frame
));
591 /* In certain pathological cases, the symtabs give the wrong
592 function (when we are in the first function in a file which
593 is compiled without debugging symbols, the previous function
594 is compiled with debugging symbols, and the "foo.o" symbol
595 that is supposed to tell us where the file with debugging
596 symbols ends has been truncated by ar because it is longer
597 than 15 characters). This also occurs if the user uses asm()
598 to create a function but not stabs for it (in a file compiled
601 So look in the minimal symbol tables as well, and if it comes
602 up with a larger address for the function use that instead.
603 I don't think this can ever cause any problems; there
604 shouldn't be any minimal symbols in the middle of a function;
605 if this is ever changed many parts of GDB will need to be
606 changed (and we'll create a find_pc_minimal_function or some
609 struct minimal_symbol
*msymbol
=
610 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
613 && (SYMBOL_VALUE_ADDRESS (msymbol
)
614 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
616 /* We also don't know anything about the function besides
617 its address and name. */
619 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
620 funlang
= SYMBOL_LANGUAGE (msymbol
);
624 funname
= DEPRECATED_SYMBOL_NAME (func
);
625 funlang
= SYMBOL_LANGUAGE (func
);
626 if (funlang
== language_cplus
)
628 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
629 to display the demangled name that we already have
630 stored in the symbol table, but we stored a version
631 with DMGL_PARAMS turned on, and here we don't want to
632 display parameters. So call the demangler again, with
635 Yes, printf_symbol_filtered() will again try to
636 demangle the name on the fly, but the issue is that
637 if cplus_demangle() fails here, it will fail there
638 too. So we want to catch the failure (where DEMANGLED
639 is NULL below) here, while we still have our hands on
640 the function symbol.) */
641 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
642 if (demangled
== NULL
)
643 /* If the demangler fails, try the demangled name from
644 the symbol table. That'll have parameters, but
645 that's preferable to displaying a mangled name. */
646 funname
= SYMBOL_PRINT_NAME (func
);
654 struct minimal_symbol
*msymbol
=
655 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
659 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
660 funlang
= SYMBOL_LANGUAGE (msymbol
);
664 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
665 get_frame_pc (frame
));
667 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
671 ui_out_text (uiout
, "#");
672 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
673 frame_relative_level (frame
));
676 if (get_frame_pc (frame
) != sal
.pc
|| !sal
.symtab
677 || print_what
== LOC_AND_ADDRESS
)
679 annotate_frame_address ();
680 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
681 annotate_frame_address_end ();
682 ui_out_text (uiout
, " in ");
684 annotate_frame_function_name ();
685 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
687 ui_out_field_stream (uiout
, "func", stb
);
688 ui_out_wrap_hint (uiout
, " ");
689 annotate_frame_args ();
691 ui_out_text (uiout
, " (");
694 struct print_args_args args
;
695 struct cleanup
*args_list_chain
;
698 args
.stream
= gdb_stdout
;
699 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
700 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ERROR
);
701 /* FIXME: ARGS must be a list. If one argument is a string it
702 will have " that will not be properly escaped. */
703 /* Invoke ui_out_tuple_end. */
704 do_cleanups (args_list_chain
);
707 ui_out_text (uiout
, ")");
708 if (sal
.symtab
&& sal
.symtab
->filename
)
710 annotate_frame_source_begin ();
711 ui_out_wrap_hint (uiout
, " ");
712 ui_out_text (uiout
, " at ");
713 annotate_frame_source_file ();
714 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
715 if (ui_out_is_mi_like_p (uiout
))
717 const char *fullname
= symtab_to_fullname (sal
.symtab
);
718 if (fullname
!= NULL
)
719 ui_out_field_string (uiout
, "fullname", fullname
);
721 annotate_frame_source_file_end ();
722 ui_out_text (uiout
, ":");
723 annotate_frame_source_line ();
724 ui_out_field_int (uiout
, "line", sal
.line
);
725 annotate_frame_source_end ();
728 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
731 char *lib
= PC_SOLIB (get_frame_pc (frame
));
733 char *lib
= solib_address (get_frame_pc (frame
));
737 annotate_frame_where ();
738 ui_out_wrap_hint (uiout
, " ");
739 ui_out_text (uiout
, " from ");
740 ui_out_field_string (uiout
, "from", lib
);
744 /* do_cleanups will call ui_out_tuple_end() for us. */
745 do_cleanups (list_chain
);
746 ui_out_text (uiout
, "\n");
747 do_cleanups (old_chain
);
751 /* Read a frame specification in whatever the appropriate format is
752 from FRAME_EXP. Call error(), printing MESSAGE, if the
753 specification is in any way invalid (so this function never returns
754 NULL). When SEPECTED_P is non-NULL set its target to indicate that
755 the default selected frame was used. */
757 static struct frame_info
*
758 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
759 int *selected_frame_p
)
762 struct value
*args
[4];
763 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
765 if (frame_exp
== NULL
)
770 struct cleanup
*tmp_cleanup
;
776 struct cleanup
*cleanup
;
779 /* Skip leading white space, bail of EOL. */
780 while (isspace (*frame_exp
))
785 /* Parse the argument, extract it, save it. */
789 addr_string
= savestring (frame_exp
, p
- frame_exp
);
791 cleanup
= make_cleanup (xfree
, addr_string
);
793 /* NOTE: Parse and evaluate expression, but do not use
794 functions such as parse_and_eval_long or
795 parse_and_eval_address to also extract the value.
796 Instead value_as_long and value_as_address are used.
797 This avoids problems with expressions that contain
799 if (numargs
>= ARRAY_SIZE (args
))
800 error (_("Too many args in frame specification"));
801 args
[numargs
++] = parse_and_eval (addr_string
);
803 do_cleanups (cleanup
);
807 /* If no args, default to the selected frame. */
810 if (selected_frame_p
!= NULL
)
811 (*selected_frame_p
) = 1;
812 return get_selected_frame (message
);
815 /* None of the remaining use the selected frame. */
816 if (selected_frame_p
!= NULL
)
817 (*selected_frame_p
) = 0;
819 /* Assume the single arg[0] is an integer, and try using that to
820 select a frame relative to current. */
823 struct frame_info
*fid
;
824 int level
= value_as_long (args
[0]);
825 fid
= find_relative_frame (get_current_frame (), &level
);
827 /* find_relative_frame was successful */
831 /* Convert each value into a corresponding address. */
834 for (i
= 0; i
< numargs
; i
++)
835 addrs
[i
] = value_as_address (args
[0]);
838 /* Assume that the single arg[0] is an address, use that to identify
839 a frame with a matching ID. Should this also accept stack/pc or
843 struct frame_id id
= frame_id_build_wild (addrs
[0]);
844 struct frame_info
*fid
;
846 /* If (s)he specifies the frame with an address, he deserves
847 what (s)he gets. Still, give the highest one that matches.
848 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
850 for (fid
= get_current_frame ();
852 fid
= get_prev_frame (fid
))
854 if (frame_id_eq (id
, get_frame_id (fid
)))
856 while (frame_id_eq (id
, frame_unwind_id (fid
)))
857 fid
= get_prev_frame (fid
);
863 /* We couldn't identify the frame as an existing frame, but
864 perhaps we can create one with a single argument. */
866 return create_new_frame (addrs
[0], 0);
867 else if (numargs
== 2)
868 return create_new_frame (addrs
[0], addrs
[1]);
870 error (_("Too many args in frame specification"));
873 static struct frame_info
*
874 parse_frame_specification (char *frame_exp
)
876 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
879 /* Print verbosely the selected frame or the frame at address
880 ADDR_EXP. Absolutely all information in the frame is printed. */
883 frame_info (char *addr_exp
, int from_tty
)
885 struct frame_info
*fi
;
886 struct symtab_and_line sal
;
889 struct frame_info
*calling_frame_info
;
890 int i
, count
, numregs
;
892 enum language funlang
= language_unknown
;
893 const char *pc_regname
;
894 int selected_frame_p
;
895 struct gdbarch
*gdbarch
;
897 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
898 gdbarch
= get_frame_arch (fi
);
900 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
901 is not a good name. */
902 if (gdbarch_pc_regnum (gdbarch
) >= 0)
903 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
904 easily not match that of the internal value returned by
906 pc_regname
= gdbarch_register_name (gdbarch
, gdbarch_pc_regnum (gdbarch
));
908 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
909 architectures will often have a hardware register called "pc",
910 and that register's value, again, can easily not match
914 find_frame_sal (fi
, &sal
);
915 func
= get_frame_function (fi
);
916 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
918 s
= find_pc_symtab (get_frame_pc (fi
));
921 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
922 display the demangled name that we already have stored in the
923 symbol table, but we stored a version with DMGL_PARAMS turned
924 on, and here we don't want to display parameters. So call the
925 demangler again, with DMGL_ANSI only.
927 Yes, printf_symbol_filtered() will again try to demangle the
928 name on the fly, but the issue is that if cplus_demangle()
929 fails here, it will fail there too. So we want to catch the
930 failure (where DEMANGLED is NULL below) here, while we still
931 have our hands on the function symbol.) */
932 funname
= DEPRECATED_SYMBOL_NAME (func
);
933 funlang
= SYMBOL_LANGUAGE (func
);
934 if (funlang
== language_cplus
)
936 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
937 /* If the demangler fails, try the demangled name from the
938 symbol table. That'll have parameters, but that's
939 preferable to displaying a mangled name. */
940 if (demangled
== NULL
)
941 funname
= SYMBOL_PRINT_NAME (func
);
948 struct minimal_symbol
*msymbol
;
950 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
953 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
954 funlang
= SYMBOL_LANGUAGE (msymbol
);
957 calling_frame_info
= get_prev_frame (fi
);
959 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
961 printf_filtered (_("Stack level %d, frame at "),
962 frame_relative_level (fi
));
966 printf_filtered (_("Stack frame at "));
968 fputs_filtered (paddress (get_frame_base (fi
)), gdb_stdout
);
969 printf_filtered (":\n");
970 printf_filtered (" %s = ", pc_regname
);
971 fputs_filtered (paddress (get_frame_pc (fi
)), gdb_stdout
);
976 printf_filtered (" in ");
977 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
978 DMGL_ANSI
| DMGL_PARAMS
);
982 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
983 puts_filtered ("; ");
985 printf_filtered ("saved %s ", pc_regname
);
986 fputs_filtered (paddress (frame_pc_unwind (fi
)), gdb_stdout
);
987 printf_filtered ("\n");
989 if (calling_frame_info
== NULL
)
991 enum unwind_stop_reason reason
;
993 reason
= get_frame_unwind_stop_reason (fi
);
994 if (reason
!= UNWIND_NO_REASON
)
995 printf_filtered (_(" Outermost frame: %s\n"),
996 frame_stop_reason_string (reason
));
999 if (calling_frame_info
)
1001 printf_filtered (" called by frame at ");
1002 fputs_filtered (paddress (get_frame_base (calling_frame_info
)),
1005 if (get_next_frame (fi
) && calling_frame_info
)
1006 puts_filtered (",");
1008 if (get_next_frame (fi
))
1010 printf_filtered (" caller of frame at ");
1011 fputs_filtered (paddress (get_frame_base (get_next_frame (fi
))),
1014 if (get_next_frame (fi
) || calling_frame_info
)
1015 puts_filtered ("\n");
1018 printf_filtered (" source language %s.\n",
1019 language_str (s
->language
));
1022 /* Address of the argument list for this frame, or 0. */
1023 CORE_ADDR arg_list
= get_frame_args_address (fi
);
1024 /* Number of args for this frame, or -1 if unknown. */
1028 printf_filtered (" Arglist at unknown address.\n");
1031 printf_filtered (" Arglist at ");
1032 fputs_filtered (paddress (arg_list
), gdb_stdout
);
1033 printf_filtered (",");
1035 if (!gdbarch_frame_num_args_p (gdbarch
))
1038 puts_filtered (" args: ");
1042 numargs
= gdbarch_frame_num_args (gdbarch
, fi
);
1043 gdb_assert (numargs
>= 0);
1045 puts_filtered (" no args.");
1046 else if (numargs
== 1)
1047 puts_filtered (" 1 arg: ");
1049 printf_filtered (" %d args: ", numargs
);
1051 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1052 puts_filtered ("\n");
1056 /* Address of the local variables for this frame, or 0. */
1057 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1060 printf_filtered (" Locals at unknown address,");
1063 printf_filtered (" Locals at ");
1064 fputs_filtered (paddress (arg_list
), gdb_stdout
);
1065 printf_filtered (",");
1069 /* Print as much information as possible on the location of all the
1072 enum lval_type lval
;
1080 /* The sp is special; what's displayed isn't the save address, but
1081 the value of the previous frame's sp. This is a legacy thing,
1082 at one stage the frame cached the previous frame's SP instead
1083 of its address, hence it was easiest to just display the cached
1085 if (gdbarch_sp_regnum (gdbarch
) >= 0)
1087 /* Find out the location of the saved stack pointer with out
1088 actually evaluating it. */
1089 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1090 &optimized
, &lval
, &addr
,
1092 if (!optimized
&& lval
== not_lval
)
1094 gdb_byte value
[MAX_REGISTER_SIZE
];
1096 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1097 &optimized
, &lval
, &addr
,
1099 /* NOTE: cagney/2003-05-22: This is assuming that the
1100 stack pointer was packed as an unsigned integer. That
1101 may or may not be valid. */
1102 sp
= extract_unsigned_integer (value
,
1103 register_size (gdbarch
,
1104 gdbarch_sp_regnum (gdbarch
)));
1105 printf_filtered (" Previous frame's sp is ");
1106 fputs_filtered (paddress (sp
), gdb_stdout
);
1107 printf_filtered ("\n");
1110 else if (!optimized
&& lval
== lval_memory
)
1112 printf_filtered (" Previous frame's sp at ");
1113 fputs_filtered (paddress (addr
), gdb_stdout
);
1114 printf_filtered ("\n");
1117 else if (!optimized
&& lval
== lval_register
)
1119 printf_filtered (" Previous frame's sp in %s\n",
1120 gdbarch_register_name (gdbarch
, realnum
));
1123 /* else keep quiet. */
1127 numregs
= gdbarch_num_regs (gdbarch
)
1128 + gdbarch_num_pseudo_regs (gdbarch
);
1129 for (i
= 0; i
< numregs
; i
++)
1130 if (i
!= gdbarch_sp_regnum (gdbarch
)
1131 && gdbarch_register_reggroup_p (gdbarch
, i
, all_reggroup
))
1133 /* Find out the location of the saved register without
1134 fetching the corresponding value. */
1135 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1137 /* For moment, only display registers that were saved on the
1139 if (!optimized
&& lval
== lval_memory
)
1142 puts_filtered (" Saved registers:\n ");
1144 puts_filtered (",");
1146 printf_filtered (" %s at ",
1147 gdbarch_register_name (gdbarch
, i
));
1148 fputs_filtered (paddress (addr
), gdb_stdout
);
1152 if (count
|| need_nl
)
1153 puts_filtered ("\n");
1157 /* Print briefly all stack frames or just the innermost COUNT_EXP
1161 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1163 struct frame_info
*fi
;
1166 struct frame_info
*trailing
;
1169 if (!target_has_stack
)
1170 error (_("No stack."));
1172 /* The following code must do two things. First, it must set the
1173 variable TRAILING to the frame from which we should start
1174 printing. Second, it must set the variable count to the number
1175 of frames which we should print, or -1 if all of them. */
1176 trailing
= get_current_frame ();
1178 /* The target can be in a state where there is no valid frames
1179 (e.g., just connected). */
1180 if (trailing
== NULL
)
1181 error (_("No stack."));
1186 count
= parse_and_eval_long (count_exp
);
1189 struct frame_info
*current
;
1194 while (current
&& count
--)
1197 current
= get_prev_frame (current
);
1200 /* Will stop when CURRENT reaches the top of the stack.
1201 TRAILING will be COUNT below it. */
1205 trailing
= get_prev_frame (trailing
);
1206 current
= get_prev_frame (current
);
1218 struct partial_symtab
*ps
;
1220 /* Read in symbols for all of the frames. Need to do this in a
1221 separate pass so that "Reading in symbols for xxx" messages
1222 don't screw up the appearance of the backtrace. Also if
1223 people have strong opinions against reading symbols for
1224 backtrace this may have to be an option. */
1226 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1229 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1231 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1235 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1239 /* Don't use print_stack_frame; if an error() occurs it probably
1240 means further attempts to backtrace would fail (on the other
1241 hand, perhaps the code does or could be fixed to make sure
1242 the frame->prev field gets set to NULL in that case). */
1243 print_frame_info (fi
, 1, LOCATION
, 1);
1245 print_frame_local_vars (fi
, 1, gdb_stdout
);
1247 /* Save the last frame to check for error conditions. */
1251 /* If we've stopped before the end, mention that. */
1253 printf_filtered (_("(More stack frames follow...)\n"));
1255 /* If we've run out of frames, and the reason appears to be an error
1256 condition, print it. */
1257 if (fi
== NULL
&& trailing
!= NULL
)
1259 enum unwind_stop_reason reason
;
1261 reason
= get_frame_unwind_stop_reason (trailing
);
1262 if (reason
> UNWIND_FIRST_ERROR
)
1263 printf_filtered (_("Backtrace stopped: %s\n"),
1264 frame_stop_reason_string (reason
));
1268 struct backtrace_command_args
1275 /* Stub for catch_errors. */
1278 backtrace_command_stub (void *data
)
1280 struct backtrace_command_args
*args
= data
;
1281 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1286 backtrace_command (char *arg
, int from_tty
)
1288 struct cleanup
*old_chain
= NULL
;
1289 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1290 struct backtrace_command_args btargs
;
1297 argv
= buildargv (arg
);
1298 old_chain
= make_cleanup_freeargv (argv
);
1300 for (i
= 0; argv
[i
]; i
++)
1304 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1305 argv
[i
][j
] = tolower (argv
[i
][j
]);
1307 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1308 fulltrace_arg
= argc
;
1311 arglen
+= strlen (argv
[i
]);
1316 if (fulltrace_arg
>= 0)
1320 arg
= xmalloc (arglen
+ 1);
1321 memset (arg
, 0, arglen
+ 1);
1322 for (i
= 0; i
< (argc
+ 1); i
++)
1324 if (i
!= fulltrace_arg
)
1326 strcat (arg
, argv
[i
]);
1336 btargs
.count_exp
= arg
;
1337 btargs
.show_locals
= (fulltrace_arg
>= 0);
1338 btargs
.from_tty
= from_tty
;
1339 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1341 if (fulltrace_arg
>= 0 && arglen
> 0)
1345 do_cleanups (old_chain
);
1349 backtrace_full_command (char *arg
, int from_tty
)
1351 struct backtrace_command_args btargs
;
1352 btargs
.count_exp
= arg
;
1353 btargs
.show_locals
= 1;
1354 btargs
.from_tty
= from_tty
;
1355 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1359 /* Print the local variables of a block B active in FRAME on STREAM.
1360 Return 1 if any variables were printed; 0 otherwise. */
1363 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1364 int num_tabs
, struct ui_file
*stream
)
1366 struct dict_iterator iter
;
1368 int values_printed
= 0;
1371 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1373 switch (SYMBOL_CLASS (sym
))
1381 for (j
= 0; j
< num_tabs
; j
++)
1382 fputs_filtered ("\t", stream
);
1383 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1384 fputs_filtered (" = ", stream
);
1385 print_variable_value (sym
, frame
, stream
);
1386 fprintf_filtered (stream
, "\n");
1390 /* Ignore symbols which are not locals. */
1395 return values_printed
;
1398 /* Same, but print labels. */
1401 print_block_frame_labels (struct block
*b
, int *have_default
,
1402 struct ui_file
*stream
)
1404 struct dict_iterator iter
;
1406 int values_printed
= 0;
1408 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1410 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1416 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1418 struct symtab_and_line sal
;
1419 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1421 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1424 fprintf_filtered (stream
, " ");
1425 fputs_filtered (paddress (SYMBOL_VALUE_ADDRESS (sym
)), stream
);
1427 fprintf_filtered (stream
, " in file %s, line %d\n",
1428 sal
.symtab
->filename
, sal
.line
);
1432 return values_printed
;
1435 /* Print on STREAM all the local variables in frame FRAME, including
1436 all the blocks active in that frame at its current PC.
1438 Returns 1 if the job was done, or 0 if nothing was printed because
1439 we have no info on the function running in FRAME. */
1442 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1443 struct ui_file
*stream
)
1445 struct block
*block
= get_frame_block (frame
, 0);
1446 int values_printed
= 0;
1450 fprintf_filtered (stream
, "No symbol table info available.\n");
1456 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1458 /* After handling the function's top-level block, stop. Don't
1459 continue to its superblock, the block of per-file symbols. */
1460 if (BLOCK_FUNCTION (block
))
1462 block
= BLOCK_SUPERBLOCK (block
);
1465 if (!values_printed
)
1466 fprintf_filtered (stream
, _("No locals.\n"));
1469 /* Same, but print labels. */
1472 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1473 struct ui_file
*stream
)
1476 fprintf_filtered (stream
, "print_frame_label_vars disabled.\n");
1478 struct blockvector
*bl
;
1479 struct block
*block
= get_frame_block (frame
, 0);
1480 int values_printed
= 0;
1481 int index
, have_default
= 0;
1482 char *blocks_printed
;
1483 CORE_ADDR pc
= get_frame_pc (frame
);
1487 fprintf_filtered (stream
, "No symbol table info available.\n");
1491 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1492 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1493 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1497 CORE_ADDR end
= BLOCK_END (block
) - 4;
1500 if (bl
!= blockvector_for_pc (end
, &index
))
1501 error (_("blockvector blotch"));
1502 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1503 error (_("blockvector botch"));
1504 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1507 /* Don't print out blocks that have gone by. */
1508 while (index
< last_index
1509 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1512 while (index
< last_index
1513 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1515 if (blocks_printed
[index
] == 0)
1517 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1518 &have_default
, stream
))
1520 blocks_printed
[index
] = 1;
1526 if (values_printed
&& this_level_only
)
1529 /* After handling the function's top-level block, stop. Don't
1530 continue to its superblock, the block of per-file symbols. */
1531 if (BLOCK_FUNCTION (block
))
1533 block
= BLOCK_SUPERBLOCK (block
);
1536 if (!values_printed
&& !this_level_only
)
1537 fprintf_filtered (stream
, _("No catches.\n"));
1542 locals_info (char *args
, int from_tty
)
1544 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1549 catch_info (char *ignore
, int from_tty
)
1551 struct symtab_and_line
*sal
;
1553 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1554 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1559 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1561 struct symbol
*func
= get_frame_function (frame
);
1563 struct dict_iterator iter
;
1564 struct symbol
*sym
, *sym2
;
1565 int values_printed
= 0;
1569 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1573 b
= SYMBOL_BLOCK_VALUE (func
);
1574 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1576 switch (SYMBOL_CLASS (sym
))
1581 case LOC_REGPARM_ADDR
:
1582 case LOC_BASEREG_ARG
:
1583 case LOC_COMPUTED_ARG
:
1585 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1586 fputs_filtered (" = ", stream
);
1588 /* We have to look up the symbol because arguments can have
1589 two entries (one a parameter, one a local) and the one we
1590 want is the local, which lookup_symbol will find for us.
1591 This includes gcc1 (not gcc2) on the sparc when passing a
1592 small structure and gcc2 when the argument type is float
1593 and it is passed as a double and converted to float by
1594 the prologue (in the latter case the type of the LOC_ARG
1595 symbol is double and the type of the LOC_LOCAL symbol is
1596 float). There are also LOC_ARG/LOC_REGISTER pairs which
1597 are not combined in symbol-reading. */
1599 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1600 b
, VAR_DOMAIN
, NULL
);
1601 print_variable_value (sym2
, frame
, stream
);
1602 fprintf_filtered (stream
, "\n");
1606 /* Don't worry about things which aren't arguments. */
1611 if (!values_printed
)
1612 fprintf_filtered (stream
, _("No arguments.\n"));
1616 args_info (char *ignore
, int from_tty
)
1618 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1624 args_plus_locals_info (char *ignore
, int from_tty
)
1626 args_info (ignore
, from_tty
);
1627 locals_info (ignore
, from_tty
);
1631 /* Select frame FRAME. Also print the stack frame and show the source
1632 if this is the tui version. */
1634 select_and_print_frame (struct frame_info
*frame
)
1636 select_frame (frame
);
1638 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1641 /* Return the symbol-block in which the selected frame is executing.
1642 Can return zero under various legitimate circumstances.
1644 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1645 code address within the block returned. We use this to decide
1646 which macros are in scope. */
1649 get_selected_block (CORE_ADDR
*addr_in_block
)
1651 if (!target_has_stack
)
1654 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1657 /* Find a frame a certain number of levels away from FRAME.
1658 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1659 Positive means go to earlier frames (up); negative, the reverse.
1660 The int that contains the number of levels is counted toward
1661 zero as the frames for those levels are found.
1662 If the top or bottom frame is reached, that frame is returned,
1663 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1664 how much farther the original request asked to go. */
1667 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1669 /* Going up is simple: just call get_prev_frame enough times or
1670 until the initial frame is reached. */
1671 while (*level_offset_ptr
> 0)
1673 struct frame_info
*prev
= get_prev_frame (frame
);
1676 (*level_offset_ptr
)--;
1680 /* Going down is just as simple. */
1681 while (*level_offset_ptr
< 0)
1683 struct frame_info
*next
= get_next_frame (frame
);
1686 (*level_offset_ptr
)++;
1693 /* The "select_frame" command. With no argument this is a NOP.
1694 Select the frame at level LEVEL_EXP if it is a valid level.
1695 Otherwise, treat LEVEL_EXP as an address expression and select it.
1697 See parse_frame_specification for more info on proper frame
1701 select_frame_command (char *level_exp
, int from_tty
)
1703 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1706 /* The "frame" command. With no argument, print the selected frame
1707 briefly. With an argument, behave like select_frame and then print
1708 the selected frame. */
1711 frame_command (char *level_exp
, int from_tty
)
1713 select_frame_command (level_exp
, from_tty
);
1714 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1717 /* The XDB Compatibility command to print the current frame. */
1720 current_frame_command (char *level_exp
, int from_tty
)
1722 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1725 /* Select the frame up one or COUNT_EXP stack levels from the
1726 previously selected frame, and print it briefly. */
1729 up_silently_base (char *count_exp
)
1731 struct frame_info
*frame
;
1735 count
= parse_and_eval_long (count_exp
);
1737 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1738 if (count
!= 0 && count_exp
== NULL
)
1739 error (_("Initial frame selected; you cannot go up."));
1740 select_frame (frame
);
1744 up_silently_command (char *count_exp
, int from_tty
)
1746 up_silently_base (count_exp
);
1750 up_command (char *count_exp
, int from_tty
)
1752 up_silently_base (count_exp
);
1753 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1756 /* Select the frame down one or COUNT_EXP stack levels from the previously
1757 selected frame, and print it briefly. */
1760 down_silently_base (char *count_exp
)
1762 struct frame_info
*frame
;
1765 count
= -parse_and_eval_long (count_exp
);
1767 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1768 if (count
!= 0 && count_exp
== NULL
)
1770 /* We only do this if COUNT_EXP is not specified. That way
1771 "down" means to really go down (and let me know if that is
1772 impossible), but "down 9999" can be used to mean go all the
1773 way down without getting an error. */
1775 error (_("Bottom (innermost) frame selected; you cannot go down."));
1778 select_frame (frame
);
1782 down_silently_command (char *count_exp
, int from_tty
)
1784 down_silently_base (count_exp
);
1788 down_command (char *count_exp
, int from_tty
)
1790 down_silently_base (count_exp
);
1791 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1796 return_command (char *retval_exp
, int from_tty
)
1798 struct symbol
*thisfun
;
1799 struct value
*return_value
= NULL
;
1800 const char *query_prefix
= "";
1802 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1804 /* Compute the return value. If the computation triggers an error,
1805 let it bail. If the return type can't be handled, set
1806 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1810 struct type
*return_type
= NULL
;
1812 /* Compute the return value. Should the computation fail, this
1813 call throws an error. */
1814 return_value
= parse_and_eval (retval_exp
);
1816 /* Cast return value to the return type of the function. Should
1817 the cast fail, this call throws an error. */
1818 if (thisfun
!= NULL
)
1819 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1820 if (return_type
== NULL
)
1821 return_type
= builtin_type_int
;
1822 CHECK_TYPEDEF (return_type
);
1823 return_value
= value_cast (return_type
, return_value
);
1825 /* Make sure the value is fully evaluated. It may live in the
1826 stack frame we're about to pop. */
1827 if (value_lazy (return_value
))
1828 value_fetch_lazy (return_value
);
1830 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1831 /* If the return-type is "void", don't try to find the
1832 return-value's location. However, do still evaluate the
1833 return expression so that, even when the expression result
1834 is discarded, side effects such as "return i++" still
1836 return_value
= NULL
;
1837 else if (using_struct_return (SYMBOL_TYPE (thisfun
), return_type
))
1840 The location at which to store the function's return value is unknown.\n\
1841 If you continue, the return value that you specified will be ignored.\n";
1842 return_value
= NULL
;
1846 /* Does an interactive user really want to do this? Include
1847 information, such as how well GDB can handle the return value, in
1848 the query message. */
1852 if (thisfun
== NULL
)
1853 confirmed
= query (_("%sMake selected stack frame return now? "),
1856 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1857 SYMBOL_PRINT_NAME (thisfun
));
1859 error (_("Not confirmed"));
1862 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1863 frame in turn, should this code just go straight to the relevant
1864 frame and pop that? */
1866 /* First discard all frames inner-to the selected frame (making the
1867 selected frame current). */
1869 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1870 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1872 struct frame_info
*frame
= get_current_frame ();
1873 if (frame_id_inner (get_frame_arch (frame
), selected_id
,
1874 get_frame_id (frame
)))
1875 /* Caught in the safety net, oops! We've gone way past the
1877 error (_("Problem while popping stack frames (corrupt stack?)"));
1878 frame_pop (get_current_frame ());
1882 /* Second discard the selected frame (which is now also the current
1884 frame_pop (get_current_frame ());
1886 /* Store RETURN_VALUE in the just-returned register set. */
1887 if (return_value
!= NULL
)
1889 struct type
*return_type
= value_type (return_value
);
1890 struct gdbarch
*gdbarch
= get_regcache_arch (get_current_regcache ());
1891 gdb_assert (gdbarch_return_value (gdbarch
, SYMBOL_TYPE (thisfun
),
1892 return_type
, NULL
, NULL
, NULL
)
1893 == RETURN_VALUE_REGISTER_CONVENTION
);
1894 gdbarch_return_value (gdbarch
, SYMBOL_TYPE (thisfun
), return_type
,
1895 get_current_regcache (), NULL
/*read*/,
1896 value_contents (return_value
) /*write*/);
1899 /* If we are at the end of a call dummy now, pop the dummy frame
1901 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1902 frame_pop (get_current_frame ());
1904 /* If interactive, print the frame that is now current. */
1906 frame_command ("0", 1);
1908 select_frame_command ("0", 0);
1911 /* Sets the scope to input function name, provided that the function
1912 is within the current stack frame */
1914 struct function_bounds
1916 CORE_ADDR low
, high
;
1920 func_command (char *arg
, int from_tty
)
1922 struct frame_info
*frame
;
1924 struct symtabs_and_lines sals
;
1927 struct function_bounds
*func_bounds
= NULL
;
1932 frame
= parse_frame_specification ("0");
1933 sals
= decode_line_spec (arg
, 1);
1934 func_bounds
= (struct function_bounds
*) xmalloc (
1935 sizeof (struct function_bounds
) * sals
.nelts
);
1936 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1938 if (sals
.sals
[i
].pc
== 0
1939 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1940 &func_bounds
[i
].low
,
1941 &func_bounds
[i
].high
) == 0)
1943 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1949 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1950 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1951 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1955 frame
= find_relative_frame (frame
, &level
);
1958 while (!found
&& level
== 0);
1961 xfree (func_bounds
);
1964 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1965 else if (frame
!= get_selected_frame (NULL
))
1966 select_and_print_frame (frame
);
1969 /* Gets the language of the current frame. */
1972 get_frame_language (void)
1974 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1978 /* We determine the current frame language by looking up its
1979 associated symtab. To retrieve this symtab, we use the frame
1980 PC. However we cannot use the frame PC as is, because it
1981 usually points to the instruction following the "call", which
1982 is sometimes the first instruction of another function. So
1983 we rely on get_frame_address_in_block(), it provides us with
1984 a PC that is guaranteed to be inside the frame's code
1986 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1987 struct symtab
*s
= find_pc_symtab (pc
);
1993 return language_unknown
;
1997 /* Provide a prototype to silence -Wmissing-prototypes. */
1998 void _initialize_stack (void);
2001 _initialize_stack (void)
2004 backtrace_limit
= 30;
2007 add_com ("return", class_stack
, return_command
, _("\
2008 Make selected stack frame return to its caller.\n\
2009 Control remains in the debugger, but when you continue\n\
2010 execution will resume in the frame above the one now selected.\n\
2011 If an argument is given, it is an expression for the value to return."));
2013 add_com ("up", class_stack
, up_command
, _("\
2014 Select and print stack frame that called this one.\n\
2015 An argument says how many frames up to go."));
2016 add_com ("up-silently", class_support
, up_silently_command
, _("\
2017 Same as the `up' command, but does not print anything.\n\
2018 This is useful in command scripts."));
2020 add_com ("down", class_stack
, down_command
, _("\
2021 Select and print stack frame called by this one.\n\
2022 An argument says how many frames down to go."));
2023 add_com_alias ("do", "down", class_stack
, 1);
2024 add_com_alias ("dow", "down", class_stack
, 1);
2025 add_com ("down-silently", class_support
, down_silently_command
, _("\
2026 Same as the `down' command, but does not print anything.\n\
2027 This is useful in command scripts."));
2029 add_com ("frame", class_stack
, frame_command
, _("\
2030 Select and print a stack frame.\n\
2031 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2032 An argument specifies the frame to select.\n\
2033 It can be a stack frame number or the address of the frame.\n\
2034 With argument, nothing is printed if input is coming from\n\
2035 a command file or a user-defined command."));
2037 add_com_alias ("f", "frame", class_stack
, 1);
2041 add_com ("L", class_stack
, current_frame_command
,
2042 _("Print the current stack frame.\n"));
2043 add_com_alias ("V", "frame", class_stack
, 1);
2045 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2046 Select a stack frame without printing anything.\n\
2047 An argument specifies the frame to select.\n\
2048 It can be a stack frame number or the address of the frame.\n"));
2050 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2051 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2052 With a negative argument, print outermost -COUNT frames.\n\
2053 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2054 add_com_alias ("bt", "backtrace", class_stack
, 0);
2057 add_com_alias ("t", "backtrace", class_stack
, 0);
2058 add_com ("T", class_stack
, backtrace_full_command
, _("\
2059 Print backtrace of all stack frames, or innermost COUNT frames \n\
2060 and the values of the local variables.\n\
2061 With a negative argument, print outermost -COUNT frames.\n\
2062 Usage: T <count>\n"));
2065 add_com_alias ("where", "backtrace", class_alias
, 0);
2066 add_info ("stack", backtrace_command
,
2067 _("Backtrace of the stack, or innermost COUNT frames."));
2068 add_info_alias ("s", "stack", 1);
2069 add_info ("frame", frame_info
,
2070 _("All about selected stack frame, or frame at ADDR."));
2071 add_info_alias ("f", "frame", 1);
2072 add_info ("locals", locals_info
,
2073 _("Local variables of current stack frame."));
2074 add_info ("args", args_info
,
2075 _("Argument variables of current stack frame."));
2077 add_com ("l", class_info
, args_plus_locals_info
,
2078 _("Argument and local variables of current stack frame."));
2081 add_com ("func", class_stack
, func_command
, _("\
2082 Select the stack frame that contains <func>.\n\
2083 Usage: func <name>\n"));
2085 add_info ("catch", catch_info
,
2086 _("Exceptions that can be caught in the current stack frame."));
2088 add_setshow_enum_cmd ("frame-arguments", class_stack
,
2089 print_frame_arguments_choices
, &print_frame_arguments
,
2090 _("Set printing of non-scalar frame arguments"),
2091 _("Show printing of non-scalar frame arguments"),
2092 NULL
, NULL
, NULL
, &setprintlist
, &showprintlist
);
2095 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2096 "Specify maximum number of frames for \"backtrace\" to print by default."),
2098 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2099 The maximum number of frames for \"backtrace\" to print by default."));