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
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_ALL
);
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
:
268 case LOC_BASEREG_ARG
:
269 case LOC_COMPUTED_ARG
:
272 /* Other types of symbols we just skip over. */
277 /* We have to look up the symbol because arguments can have
278 two entries (one a parameter, one a local) and the one we
279 want is the local, which lookup_symbol will find for us.
280 This includes gcc1 (not gcc2) on SPARC when passing a
281 small structure and gcc2 when the argument type is float
282 and it is passed as a double and converted to float by
283 the prologue (in the latter case the type of the LOC_ARG
284 symbol is double and the type of the LOC_LOCAL symbol is
286 /* But if the parameter name is null, don't try it. Null
287 parameter names occur on the RS/6000, for traceback
288 tables. FIXME, should we even print them? */
290 if (*DEPRECATED_SYMBOL_NAME (sym
))
293 nsym
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
294 b
, VAR_DOMAIN
, NULL
, NULL
);
295 gdb_assert (nsym
!= NULL
);
296 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
)
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 common_val_print (val
, stb
->stream
, 0, 0, 2,
370 ui_out_field_stream (uiout
, "value", stb
);
373 ui_out_text (uiout
, "???");
376 ui_out_text (uiout
, "...");
379 /* Invoke ui_out_tuple_end. */
380 do_cleanups (list_chain
);
388 /* Don't print nameless args in situations where we don't know
389 enough about the stack to find them. */
394 if (highest_offset
== -1)
395 start
= gdbarch_frame_args_skip (get_frame_arch (frame
));
397 start
= highest_offset
;
399 print_frame_nameless_args (frame
, start
, num
- args_printed
,
403 do_cleanups (old_chain
);
406 /* Stub for catch_errors. */
409 print_args_stub (void *args
)
411 struct print_args_args
*p
= args
;
414 if (gdbarch_frame_num_args_p (current_gdbarch
))
416 numargs
= gdbarch_frame_num_args (current_gdbarch
, p
->frame
);
417 gdb_assert (numargs
>= 0);
421 print_frame_args (p
->func
, p
->frame
, numargs
, p
->stream
);
425 /* Set the current source and line to the location given by frame
426 FRAME, if possible. When CENTER is true, adjust so the relevant
427 line is in the center of the next 'list'. */
430 set_current_sal_from_frame (struct frame_info
*frame
, int center
)
432 struct symtab_and_line sal
;
434 find_frame_sal (frame
, &sal
);
438 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
439 set_current_source_symtab_and_line (&sal
);
443 /* Print information about frame FRAME. The output is format according
444 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
447 SRC_LINE: Print only source line.
448 LOCATION: Print only location.
449 LOC_AND_SRC: Print location and source line.
451 Used in "where" output, and to emit breakpoint or step
455 print_frame_info (struct frame_info
*frame
, int print_level
,
456 enum print_what print_what
, int print_args
)
458 struct symtab_and_line sal
;
462 if (get_frame_type (frame
) == DUMMY_FRAME
463 || get_frame_type (frame
) == SIGTRAMP_FRAME
)
465 struct cleanup
*uiout_cleanup
466 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
468 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
469 get_frame_pc (frame
));
471 /* Do this regardless of SOURCE because we don't have any source
472 to list for this frame. */
475 ui_out_text (uiout
, "#");
476 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
477 frame_relative_level (frame
));
479 if (ui_out_is_mi_like_p (uiout
))
481 annotate_frame_address ();
482 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
483 annotate_frame_address_end ();
486 if (get_frame_type (frame
) == DUMMY_FRAME
)
488 annotate_function_call ();
489 ui_out_field_string (uiout
, "func", "<function called from gdb>");
491 else if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
493 annotate_signal_handler_caller ();
494 ui_out_field_string (uiout
, "func", "<signal handler called>");
496 ui_out_text (uiout
, "\n");
497 annotate_frame_end ();
499 do_cleanups (uiout_cleanup
);
503 /* If FRAME is not the innermost frame, that normally means that
504 FRAME->pc points to *after* the call instruction, and we want to
505 get the line containing the call, never the next line. But if
506 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
507 next frame was not entered as the result of a call, and we want
508 to get the line containing FRAME->pc. */
509 find_frame_sal (frame
, &sal
);
511 location_print
= (print_what
== LOCATION
512 || print_what
== LOC_AND_ADDRESS
513 || print_what
== SRC_AND_LOC
);
515 if (location_print
|| !sal
.symtab
)
516 print_frame (frame
, print_level
, print_what
, print_args
, sal
);
518 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
520 if (source_print
&& sal
.symtab
)
523 int mid_statement
= ((print_what
== SRC_LINE
)
524 && (get_frame_pc (frame
) != sal
.pc
));
526 if (annotation_level
)
527 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
528 get_frame_pc (frame
));
531 if (deprecated_print_frame_info_listing_hook
)
532 deprecated_print_frame_info_listing_hook (sal
.symtab
,
537 /* We used to do this earlier, but that is clearly
538 wrong. This function is used by many different
539 parts of gdb, including normal_stop in infrun.c,
540 which uses this to print out the current PC
541 when we stepi/nexti into the middle of a source
542 line. Only the command line really wants this
543 behavior. Other UIs probably would like the
544 ability to decide for themselves if it is desired. */
545 if (addressprint
&& mid_statement
)
547 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
548 ui_out_text (uiout
, "\t");
551 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
556 if (print_what
!= LOCATION
)
557 set_default_breakpoint (1, get_frame_pc (frame
), sal
.symtab
, sal
.line
);
559 annotate_frame_end ();
561 gdb_flush (gdb_stdout
);
565 print_frame (struct frame_info
*frame
, int print_level
,
566 enum print_what print_what
, int print_args
,
567 struct symtab_and_line sal
)
570 char *funname
= NULL
;
571 enum language funlang
= language_unknown
;
572 struct ui_stream
*stb
;
573 struct cleanup
*old_chain
, *list_chain
;
575 stb
= ui_out_stream_new (uiout
);
576 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
578 func
= find_pc_function (get_frame_address_in_block (frame
));
581 /* In certain pathological cases, the symtabs give the wrong
582 function (when we are in the first function in a file which
583 is compiled without debugging symbols, the previous function
584 is compiled with debugging symbols, and the "foo.o" symbol
585 that is supposed to tell us where the file with debugging
586 symbols ends has been truncated by ar because it is longer
587 than 15 characters). This also occurs if the user uses asm()
588 to create a function but not stabs for it (in a file compiled
591 So look in the minimal symbol tables as well, and if it comes
592 up with a larger address for the function use that instead.
593 I don't think this can ever cause any problems; there
594 shouldn't be any minimal symbols in the middle of a function;
595 if this is ever changed many parts of GDB will need to be
596 changed (and we'll create a find_pc_minimal_function or some
599 struct minimal_symbol
*msymbol
=
600 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
603 && (SYMBOL_VALUE_ADDRESS (msymbol
)
604 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
606 /* We also don't know anything about the function besides
607 its address and name. */
609 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
610 funlang
= SYMBOL_LANGUAGE (msymbol
);
614 funname
= DEPRECATED_SYMBOL_NAME (func
);
615 funlang
= SYMBOL_LANGUAGE (func
);
616 if (funlang
== language_cplus
)
618 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
619 to display the demangled name that we already have
620 stored in the symbol table, but we stored a version
621 with DMGL_PARAMS turned on, and here we don't want to
622 display parameters. So call the demangler again, with
625 Yes, printf_symbol_filtered() will again try to
626 demangle the name on the fly, but the issue is that
627 if cplus_demangle() fails here, it will fail there
628 too. So we want to catch the failure (where DEMANGLED
629 is NULL below) here, while we still have our hands on
630 the function symbol.) */
631 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
632 if (demangled
== NULL
)
633 /* If the demangler fails, try the demangled name from
634 the symbol table. That'll have parameters, but
635 that's preferable to displaying a mangled name. */
636 funname
= SYMBOL_PRINT_NAME (func
);
644 struct minimal_symbol
*msymbol
=
645 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
649 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
650 funlang
= SYMBOL_LANGUAGE (msymbol
);
654 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
655 get_frame_pc (frame
));
657 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
661 ui_out_text (uiout
, "#");
662 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
663 frame_relative_level (frame
));
666 if (get_frame_pc (frame
) != sal
.pc
|| !sal
.symtab
667 || print_what
== LOC_AND_ADDRESS
)
669 annotate_frame_address ();
670 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
671 annotate_frame_address_end ();
672 ui_out_text (uiout
, " in ");
674 annotate_frame_function_name ();
675 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
677 ui_out_field_stream (uiout
, "func", stb
);
678 ui_out_wrap_hint (uiout
, " ");
679 annotate_frame_args ();
681 ui_out_text (uiout
, " (");
684 struct print_args_args args
;
685 struct cleanup
*args_list_chain
;
688 args
.stream
= gdb_stdout
;
689 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
690 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
691 /* FIXME: ARGS must be a list. If one argument is a string it
692 will have " that will not be properly escaped. */
693 /* Invoke ui_out_tuple_end. */
694 do_cleanups (args_list_chain
);
697 ui_out_text (uiout
, ")");
698 if (sal
.symtab
&& sal
.symtab
->filename
)
700 annotate_frame_source_begin ();
701 ui_out_wrap_hint (uiout
, " ");
702 ui_out_text (uiout
, " at ");
703 annotate_frame_source_file ();
704 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
705 if (ui_out_is_mi_like_p (uiout
))
707 const char *fullname
= symtab_to_fullname (sal
.symtab
);
708 if (fullname
!= NULL
)
709 ui_out_field_string (uiout
, "fullname", fullname
);
711 annotate_frame_source_file_end ();
712 ui_out_text (uiout
, ":");
713 annotate_frame_source_line ();
714 ui_out_field_int (uiout
, "line", sal
.line
);
715 annotate_frame_source_end ();
718 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
721 char *lib
= PC_SOLIB (get_frame_pc (frame
));
723 char *lib
= solib_address (get_frame_pc (frame
));
727 annotate_frame_where ();
728 ui_out_wrap_hint (uiout
, " ");
729 ui_out_text (uiout
, " from ");
730 ui_out_field_string (uiout
, "from", lib
);
734 /* do_cleanups will call ui_out_tuple_end() for us. */
735 do_cleanups (list_chain
);
736 ui_out_text (uiout
, "\n");
737 do_cleanups (old_chain
);
740 /* Show the frame info. If this is the tui, it will be shown in the
741 source display otherwise, nothing is done. */
744 show_stack_frame (struct frame_info
*frame
)
749 /* Read a frame specification in whatever the appropriate format is
750 from FRAME_EXP. Call error(), printing MESSAGE, if the
751 specification is in any way invalid (so this function never returns
752 NULL). When SEPECTED_P is non-NULL set its target to indicate that
753 the default selected frame was used. */
755 static struct frame_info
*
756 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
757 int *selected_frame_p
)
760 struct value
*args
[4];
761 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
763 if (frame_exp
== NULL
)
768 struct cleanup
*tmp_cleanup
;
774 struct cleanup
*cleanup
;
777 /* Skip leading white space, bail of EOL. */
778 while (isspace (*frame_exp
))
783 /* Parse the argument, extract it, save it. */
787 addr_string
= savestring (frame_exp
, p
- frame_exp
);
789 cleanup
= make_cleanup (xfree
, addr_string
);
791 /* NOTE: Parse and evaluate expression, but do not use
792 functions such as parse_and_eval_long or
793 parse_and_eval_address to also extract the value.
794 Instead value_as_long and value_as_address are used.
795 This avoids problems with expressions that contain
797 if (numargs
>= ARRAY_SIZE (args
))
798 error (_("Too many args in frame specification"));
799 args
[numargs
++] = parse_and_eval (addr_string
);
801 do_cleanups (cleanup
);
805 /* If no args, default to the selected frame. */
808 if (selected_frame_p
!= NULL
)
809 (*selected_frame_p
) = 1;
810 return get_selected_frame (message
);
813 /* None of the remaining use the selected frame. */
814 if (selected_frame_p
!= NULL
)
815 (*selected_frame_p
) = 0;
817 /* Assume the single arg[0] is an integer, and try using that to
818 select a frame relative to current. */
821 struct frame_info
*fid
;
822 int level
= value_as_long (args
[0]);
823 fid
= find_relative_frame (get_current_frame (), &level
);
825 /* find_relative_frame was successful */
829 /* Convert each value into a corresponding address. */
832 for (i
= 0; i
< numargs
; i
++)
833 addrs
[i
] = value_as_address (args
[0]);
836 /* Assume that the single arg[0] is an address, use that to identify
837 a frame with a matching ID. Should this also accept stack/pc or
841 struct frame_id id
= frame_id_build_wild (addrs
[0]);
842 struct frame_info
*fid
;
844 /* If (s)he specifies the frame with an address, he deserves
845 what (s)he gets. Still, give the highest one that matches.
846 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
848 for (fid
= get_current_frame ();
850 fid
= get_prev_frame (fid
))
852 if (frame_id_eq (id
, get_frame_id (fid
)))
854 while (frame_id_eq (id
, frame_unwind_id (fid
)))
855 fid
= get_prev_frame (fid
);
861 /* We couldn't identify the frame as an existing frame, but
862 perhaps we can create one with a single argument. */
864 return create_new_frame (addrs
[0], 0);
865 else if (numargs
== 2)
866 return create_new_frame (addrs
[0], addrs
[1]);
868 error (_("Too many args in frame specification"));
871 static struct frame_info
*
872 parse_frame_specification (char *frame_exp
)
874 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
877 /* Print verbosely the selected frame or the frame at address
878 ADDR_EXP. Absolutely all information in the frame is printed. */
881 frame_info (char *addr_exp
, int from_tty
)
883 struct frame_info
*fi
;
884 struct symtab_and_line sal
;
887 struct frame_info
*calling_frame_info
;
888 int i
, count
, numregs
;
890 enum language funlang
= language_unknown
;
891 const char *pc_regname
;
892 int selected_frame_p
;
893 struct gdbarch
*gdbarch
;
895 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
897 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
898 is not a good name. */
899 if (gdbarch_pc_regnum (current_gdbarch
) >= 0)
900 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
901 easily not match that of the internal value returned by
903 pc_regname
= gdbarch_register_name (current_gdbarch
,
904 gdbarch_pc_regnum (current_gdbarch
));
906 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
907 architectures will often have a hardware register called "pc",
908 and that register's value, again, can easily not match
912 find_frame_sal (fi
, &sal
);
913 gdbarch
= get_frame_arch (fi
);
914 func
= get_frame_function (fi
);
915 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
917 s
= find_pc_symtab (get_frame_pc (fi
));
920 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
921 display the demangled name that we already have stored in the
922 symbol table, but we stored a version with DMGL_PARAMS turned
923 on, and here we don't want to display parameters. So call the
924 demangler again, with DMGL_ANSI only.
926 Yes, printf_symbol_filtered() will again try to demangle the
927 name on the fly, but the issue is that if cplus_demangle()
928 fails here, it will fail there too. So we want to catch the
929 failure (where DEMANGLED is NULL below) here, while we still
930 have our hands on the function symbol.) */
931 funname
= DEPRECATED_SYMBOL_NAME (func
);
932 funlang
= SYMBOL_LANGUAGE (func
);
933 if (funlang
== language_cplus
)
935 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
936 /* If the demangler fails, try the demangled name from the
937 symbol table. That'll have parameters, but that's
938 preferable to displaying a mangled name. */
939 if (demangled
== NULL
)
940 funname
= SYMBOL_PRINT_NAME (func
);
947 struct minimal_symbol
*msymbol
;
949 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
952 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
953 funlang
= SYMBOL_LANGUAGE (msymbol
);
956 calling_frame_info
= get_prev_frame (fi
);
958 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
960 printf_filtered (_("Stack level %d, frame at "),
961 frame_relative_level (fi
));
965 printf_filtered (_("Stack frame at "));
967 deprecated_print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
968 printf_filtered (":\n");
969 printf_filtered (" %s = ", pc_regname
);
970 deprecated_print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
975 printf_filtered (" in ");
976 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
977 DMGL_ANSI
| DMGL_PARAMS
);
981 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
982 puts_filtered ("; ");
984 printf_filtered ("saved %s ", pc_regname
);
985 deprecated_print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
986 printf_filtered ("\n");
988 if (calling_frame_info
== NULL
)
990 enum unwind_stop_reason reason
;
992 reason
= get_frame_unwind_stop_reason (fi
);
993 if (reason
!= UNWIND_NO_REASON
)
994 printf_filtered (_(" Outermost frame: %s\n"),
995 frame_stop_reason_string (reason
));
998 if (calling_frame_info
)
1000 printf_filtered (" called by frame at ");
1001 deprecated_print_address_numeric (get_frame_base (calling_frame_info
),
1004 if (get_next_frame (fi
) && calling_frame_info
)
1005 puts_filtered (",");
1007 if (get_next_frame (fi
))
1009 printf_filtered (" caller of frame at ");
1010 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
1013 if (get_next_frame (fi
) || calling_frame_info
)
1014 puts_filtered ("\n");
1017 printf_filtered (" source language %s.\n",
1018 language_str (s
->language
));
1021 /* Address of the argument list for this frame, or 0. */
1022 CORE_ADDR arg_list
= get_frame_args_address (fi
);
1023 /* Number of args for this frame, or -1 if unknown. */
1027 printf_filtered (" Arglist at unknown address.\n");
1030 printf_filtered (" Arglist at ");
1031 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1032 printf_filtered (",");
1034 if (!gdbarch_frame_num_args_p (gdbarch
))
1037 puts_filtered (" args: ");
1041 numargs
= gdbarch_frame_num_args (gdbarch
, fi
);
1042 gdb_assert (numargs
>= 0);
1044 puts_filtered (" no args.");
1045 else if (numargs
== 1)
1046 puts_filtered (" 1 arg: ");
1048 printf_filtered (" %d args: ", numargs
);
1050 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1051 puts_filtered ("\n");
1055 /* Address of the local variables for this frame, or 0. */
1056 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1059 printf_filtered (" Locals at unknown address,");
1062 printf_filtered (" Locals at ");
1063 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1064 printf_filtered (",");
1068 /* Print as much information as possible on the location of all the
1071 enum lval_type lval
;
1079 /* The sp is special; what's displayed isn't the save address, but
1080 the value of the previous frame's sp. This is a legacy thing,
1081 at one stage the frame cached the previous frame's SP instead
1082 of its address, hence it was easiest to just display the cached
1084 if (gdbarch_sp_regnum (gdbarch
) >= 0)
1086 /* Find out the location of the saved stack pointer with out
1087 actually evaluating it. */
1088 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1089 &optimized
, &lval
, &addr
,
1091 if (!optimized
&& lval
== not_lval
)
1093 gdb_byte value
[MAX_REGISTER_SIZE
];
1095 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1096 &optimized
, &lval
, &addr
,
1098 /* NOTE: cagney/2003-05-22: This is assuming that the
1099 stack pointer was packed as an unsigned integer. That
1100 may or may not be valid. */
1101 sp
= extract_unsigned_integer (value
,
1102 register_size (gdbarch
,
1103 gdbarch_sp_regnum (gdbarch
)));
1104 printf_filtered (" Previous frame's sp is ");
1105 deprecated_print_address_numeric (sp
, 1, gdb_stdout
);
1106 printf_filtered ("\n");
1109 else if (!optimized
&& lval
== lval_memory
)
1111 printf_filtered (" Previous frame's sp at ");
1112 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1113 printf_filtered ("\n");
1116 else if (!optimized
&& lval
== lval_register
)
1118 printf_filtered (" Previous frame's sp in %s\n",
1119 gdbarch_register_name (gdbarch
, realnum
));
1122 /* else keep quiet. */
1126 numregs
= gdbarch_num_regs (gdbarch
)
1127 + gdbarch_num_pseudo_regs (gdbarch
);
1128 for (i
= 0; i
< numregs
; i
++)
1129 if (i
!= gdbarch_sp_regnum (gdbarch
)
1130 && gdbarch_register_reggroup_p (gdbarch
, i
, all_reggroup
))
1132 /* Find out the location of the saved register without
1133 fetching the corresponding value. */
1134 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1136 /* For moment, only display registers that were saved on the
1138 if (!optimized
&& lval
== lval_memory
)
1141 puts_filtered (" Saved registers:\n ");
1143 puts_filtered (",");
1145 printf_filtered (" %s at ",
1146 gdbarch_register_name (gdbarch
, i
));
1147 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1151 if (count
|| need_nl
)
1152 puts_filtered ("\n");
1156 /* Print briefly all stack frames or just the innermost COUNT_EXP
1160 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1162 struct frame_info
*fi
;
1165 struct frame_info
*trailing
;
1168 if (!target_has_stack
)
1169 error (_("No stack."));
1171 /* The following code must do two things. First, it must set the
1172 variable TRAILING to the frame from which we should start
1173 printing. Second, it must set the variable count to the number
1174 of frames which we should print, or -1 if all of them. */
1175 trailing
= get_current_frame ();
1177 /* The target can be in a state where there is no valid frames
1178 (e.g., just connected). */
1179 if (trailing
== NULL
)
1180 error (_("No stack."));
1185 count
= parse_and_eval_long (count_exp
);
1188 struct frame_info
*current
;
1193 while (current
&& count
--)
1196 current
= get_prev_frame (current
);
1199 /* Will stop when CURRENT reaches the top of the stack.
1200 TRAILING will be COUNT below it. */
1204 trailing
= get_prev_frame (trailing
);
1205 current
= get_prev_frame (current
);
1217 struct partial_symtab
*ps
;
1219 /* Read in symbols for all of the frames. Need to do this in a
1220 separate pass so that "Reading in symbols for xxx" messages
1221 don't screw up the appearance of the backtrace. Also if
1222 people have strong opinions against reading symbols for
1223 backtrace this may have to be an option. */
1225 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1228 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1230 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1234 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1238 /* Don't use print_stack_frame; if an error() occurs it probably
1239 means further attempts to backtrace would fail (on the other
1240 hand, perhaps the code does or could be fixed to make sure
1241 the frame->prev field gets set to NULL in that case). */
1242 print_frame_info (fi
, 1, LOCATION
, 1);
1244 print_frame_local_vars (fi
, 1, gdb_stdout
);
1246 /* Save the last frame to check for error conditions. */
1250 /* If we've stopped before the end, mention that. */
1252 printf_filtered (_("(More stack frames follow...)\n"));
1254 /* If we've run out of frames, and the reason appears to be an error
1255 condition, print it. */
1256 if (fi
== NULL
&& trailing
!= NULL
)
1258 enum unwind_stop_reason reason
;
1260 reason
= get_frame_unwind_stop_reason (trailing
);
1261 if (reason
> UNWIND_FIRST_ERROR
)
1262 printf_filtered (_("Backtrace stopped: %s\n"),
1263 frame_stop_reason_string (reason
));
1267 struct backtrace_command_args
1274 /* Stub for catch_errors. */
1277 backtrace_command_stub (void *data
)
1279 struct backtrace_command_args
*args
= data
;
1280 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1285 backtrace_command (char *arg
, int from_tty
)
1287 struct cleanup
*old_chain
= NULL
;
1288 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1289 struct backtrace_command_args btargs
;
1296 argv
= buildargv (arg
);
1297 old_chain
= make_cleanup_freeargv (argv
);
1299 for (i
= 0; argv
[i
]; i
++)
1303 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1304 argv
[i
][j
] = tolower (argv
[i
][j
]);
1306 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1307 fulltrace_arg
= argc
;
1310 arglen
+= strlen (argv
[i
]);
1315 if (fulltrace_arg
>= 0)
1319 arg
= xmalloc (arglen
+ 1);
1320 memset (arg
, 0, arglen
+ 1);
1321 for (i
= 0; i
< (argc
+ 1); i
++)
1323 if (i
!= fulltrace_arg
)
1325 strcat (arg
, argv
[i
]);
1335 btargs
.count_exp
= arg
;
1336 btargs
.show_locals
= (fulltrace_arg
>= 0);
1337 btargs
.from_tty
= from_tty
;
1338 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1340 if (fulltrace_arg
>= 0 && arglen
> 0)
1344 do_cleanups (old_chain
);
1348 backtrace_full_command (char *arg
, int from_tty
)
1350 struct backtrace_command_args btargs
;
1351 btargs
.count_exp
= arg
;
1352 btargs
.show_locals
= 1;
1353 btargs
.from_tty
= from_tty
;
1354 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1358 /* Print the local variables of a block B active in FRAME on STREAM.
1359 Return 1 if any variables were printed; 0 otherwise. */
1362 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1363 int num_tabs
, struct ui_file
*stream
)
1365 struct dict_iterator iter
;
1367 int values_printed
= 0;
1370 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1372 switch (SYMBOL_CLASS (sym
))
1380 for (j
= 0; j
< num_tabs
; j
++)
1381 fputs_filtered ("\t", stream
);
1382 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1383 fputs_filtered (" = ", stream
);
1384 print_variable_value (sym
, frame
, stream
);
1385 fprintf_filtered (stream
, "\n");
1389 /* Ignore symbols which are not locals. */
1394 return values_printed
;
1397 /* Same, but print labels. */
1400 print_block_frame_labels (struct block
*b
, int *have_default
,
1401 struct ui_file
*stream
)
1403 struct dict_iterator iter
;
1405 int values_printed
= 0;
1407 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1409 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1415 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1417 struct symtab_and_line sal
;
1418 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1420 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1423 fprintf_filtered (stream
, " ");
1424 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1426 fprintf_filtered (stream
, " in file %s, line %d\n",
1427 sal
.symtab
->filename
, sal
.line
);
1431 return values_printed
;
1434 /* Print on STREAM all the local variables in frame FRAME, including
1435 all the blocks active in that frame at its current PC.
1437 Returns 1 if the job was done, or 0 if nothing was printed because
1438 we have no info on the function running in FRAME. */
1441 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1442 struct ui_file
*stream
)
1444 struct block
*block
= get_frame_block (frame
, 0);
1445 int values_printed
= 0;
1449 fprintf_filtered (stream
, "No symbol table info available.\n");
1455 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1457 /* After handling the function's top-level block, stop. Don't
1458 continue to its superblock, the block of per-file symbols. */
1459 if (BLOCK_FUNCTION (block
))
1461 block
= BLOCK_SUPERBLOCK (block
);
1464 if (!values_printed
)
1465 fprintf_filtered (stream
, _("No locals.\n"));
1468 /* Same, but print labels. */
1471 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1472 struct ui_file
*stream
)
1474 struct blockvector
*bl
;
1475 struct block
*block
= get_frame_block (frame
, 0);
1476 int values_printed
= 0;
1477 int index
, have_default
= 0;
1478 char *blocks_printed
;
1479 CORE_ADDR pc
= get_frame_pc (frame
);
1483 fprintf_filtered (stream
, "No symbol table info available.\n");
1487 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1488 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1489 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1493 CORE_ADDR end
= BLOCK_END (block
) - 4;
1496 if (bl
!= blockvector_for_pc (end
, &index
))
1497 error (_("blockvector blotch"));
1498 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1499 error (_("blockvector botch"));
1500 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1503 /* Don't print out blocks that have gone by. */
1504 while (index
< last_index
1505 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1508 while (index
< last_index
1509 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1511 if (blocks_printed
[index
] == 0)
1513 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1514 &have_default
, stream
))
1516 blocks_printed
[index
] = 1;
1522 if (values_printed
&& this_level_only
)
1525 /* After handling the function's top-level block, stop. Don't
1526 continue to its superblock, the block of per-file symbols. */
1527 if (BLOCK_FUNCTION (block
))
1529 block
= BLOCK_SUPERBLOCK (block
);
1532 if (!values_printed
&& !this_level_only
)
1533 fprintf_filtered (stream
, _("No catches.\n"));
1537 locals_info (char *args
, int from_tty
)
1539 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1544 catch_info (char *ignore
, int from_tty
)
1546 struct symtab_and_line
*sal
;
1548 /* Check for target support for exception handling */
1549 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1552 /* Currently not handling this. Ideally, here we should
1553 interact with the C++ runtime system to find the list of
1554 active handlers, etc. */
1555 fprintf_filtered (gdb_stdout
, _("\
1556 Info catch not supported with this target/compiler combination.\n"));
1560 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1561 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1567 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1569 struct symbol
*func
= get_frame_function (frame
);
1571 struct dict_iterator iter
;
1572 struct symbol
*sym
, *sym2
;
1573 int values_printed
= 0;
1577 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1581 b
= SYMBOL_BLOCK_VALUE (func
);
1582 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1584 switch (SYMBOL_CLASS (sym
))
1590 case LOC_REGPARM_ADDR
:
1591 case LOC_BASEREG_ARG
:
1592 case LOC_COMPUTED_ARG
:
1594 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1595 fputs_filtered (" = ", stream
);
1597 /* We have to look up the symbol because arguments can have
1598 two entries (one a parameter, one a local) and the one we
1599 want is the local, which lookup_symbol will find for us.
1600 This includes gcc1 (not gcc2) on the sparc when passing a
1601 small structure and gcc2 when the argument type is float
1602 and it is passed as a double and converted to float by
1603 the prologue (in the latter case the type of the LOC_ARG
1604 symbol is double and the type of the LOC_LOCAL symbol is
1605 float). There are also LOC_ARG/LOC_REGISTER pairs which
1606 are not combined in symbol-reading. */
1608 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1609 b
, VAR_DOMAIN
, NULL
, NULL
);
1610 print_variable_value (sym2
, frame
, stream
);
1611 fprintf_filtered (stream
, "\n");
1615 /* Don't worry about things which aren't arguments. */
1620 if (!values_printed
)
1621 fprintf_filtered (stream
, _("No arguments.\n"));
1625 args_info (char *ignore
, int from_tty
)
1627 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1633 args_plus_locals_info (char *ignore
, int from_tty
)
1635 args_info (ignore
, from_tty
);
1636 locals_info (ignore
, from_tty
);
1640 /* Select frame FRAME. Also print the stack frame and show the source
1641 if this is the tui version. */
1643 select_and_print_frame (struct frame_info
*frame
)
1645 select_frame (frame
);
1647 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1650 /* Return the symbol-block in which the selected frame is executing.
1651 Can return zero under various legitimate circumstances.
1653 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1654 code address within the block returned. We use this to decide
1655 which macros are in scope. */
1658 get_selected_block (CORE_ADDR
*addr_in_block
)
1660 if (!target_has_stack
)
1663 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1666 /* Find a frame a certain number of levels away from FRAME.
1667 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1668 Positive means go to earlier frames (up); negative, the reverse.
1669 The int that contains the number of levels is counted toward
1670 zero as the frames for those levels are found.
1671 If the top or bottom frame is reached, that frame is returned,
1672 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1673 how much farther the original request asked to go. */
1676 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1678 /* Going up is simple: just call get_prev_frame enough times or
1679 until the initial frame is reached. */
1680 while (*level_offset_ptr
> 0)
1682 struct frame_info
*prev
= get_prev_frame (frame
);
1685 (*level_offset_ptr
)--;
1689 /* Going down is just as simple. */
1690 while (*level_offset_ptr
< 0)
1692 struct frame_info
*next
= get_next_frame (frame
);
1695 (*level_offset_ptr
)++;
1702 /* The "select_frame" command. With no argument this is a NOP.
1703 Select the frame at level LEVEL_EXP if it is a valid level.
1704 Otherwise, treat LEVEL_EXP as an address expression and select it.
1706 See parse_frame_specification for more info on proper frame
1710 select_frame_command (char *level_exp
, int from_tty
)
1712 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1715 /* The "frame" command. With no argument, print the selected frame
1716 briefly. With an argument, behave like select_frame and then print
1717 the selected frame. */
1720 frame_command (char *level_exp
, int from_tty
)
1722 select_frame_command (level_exp
, from_tty
);
1723 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1726 /* The XDB Compatibility command to print the current frame. */
1729 current_frame_command (char *level_exp
, int from_tty
)
1731 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1734 /* Select the frame up one or COUNT_EXP stack levels from the
1735 previously selected frame, and print it briefly. */
1738 up_silently_base (char *count_exp
)
1740 struct frame_info
*frame
;
1744 count
= parse_and_eval_long (count_exp
);
1746 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1747 if (count
!= 0 && count_exp
== NULL
)
1748 error (_("Initial frame selected; you cannot go up."));
1749 select_frame (frame
);
1753 up_silently_command (char *count_exp
, int from_tty
)
1755 up_silently_base (count_exp
);
1759 up_command (char *count_exp
, int from_tty
)
1761 up_silently_base (count_exp
);
1762 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1765 /* Select the frame down one or COUNT_EXP stack levels from the previously
1766 selected frame, and print it briefly. */
1769 down_silently_base (char *count_exp
)
1771 struct frame_info
*frame
;
1774 count
= -parse_and_eval_long (count_exp
);
1776 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1777 if (count
!= 0 && count_exp
== NULL
)
1779 /* We only do this if COUNT_EXP is not specified. That way
1780 "down" means to really go down (and let me know if that is
1781 impossible), but "down 9999" can be used to mean go all the
1782 way down without getting an error. */
1784 error (_("Bottom (innermost) frame selected; you cannot go down."));
1787 select_frame (frame
);
1791 down_silently_command (char *count_exp
, int from_tty
)
1793 down_silently_base (count_exp
);
1797 down_command (char *count_exp
, int from_tty
)
1799 down_silently_base (count_exp
);
1800 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1805 return_command (char *retval_exp
, int from_tty
)
1807 struct symbol
*thisfun
;
1808 struct value
*return_value
= NULL
;
1809 const char *query_prefix
= "";
1811 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1813 /* Compute the return value. If the computation triggers an error,
1814 let it bail. If the return type can't be handled, set
1815 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1819 struct type
*return_type
= NULL
;
1821 /* Compute the return value. Should the computation fail, this
1822 call throws an error. */
1823 return_value
= parse_and_eval (retval_exp
);
1825 /* Cast return value to the return type of the function. Should
1826 the cast fail, this call throws an error. */
1827 if (thisfun
!= NULL
)
1828 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1829 if (return_type
== NULL
)
1830 return_type
= builtin_type_int
;
1831 CHECK_TYPEDEF (return_type
);
1832 return_value
= value_cast (return_type
, return_value
);
1834 /* Make sure the value is fully evaluated. It may live in the
1835 stack frame we're about to pop. */
1836 if (value_lazy (return_value
))
1837 value_fetch_lazy (return_value
);
1839 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1840 /* If the return-type is "void", don't try to find the
1841 return-value's location. However, do still evaluate the
1842 return expression so that, even when the expression result
1843 is discarded, side effects such as "return i++" still
1845 return_value
= NULL
;
1846 else if (using_struct_return (return_type
))
1849 The location at which to store the function's return value is unknown.\n\
1850 If you continue, the return value that you specified will be ignored.\n";
1851 return_value
= NULL
;
1855 /* Does an interactive user really want to do this? Include
1856 information, such as how well GDB can handle the return value, in
1857 the query message. */
1861 if (thisfun
== NULL
)
1862 confirmed
= query (_("%sMake selected stack frame return now? "),
1865 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1866 SYMBOL_PRINT_NAME (thisfun
));
1868 error (_("Not confirmed"));
1871 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1872 frame in turn, should this code just go straight to the relevant
1873 frame and pop that? */
1875 /* First discard all frames inner-to the selected frame (making the
1876 selected frame current). */
1878 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1879 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1881 struct frame_info
*frame
= get_current_frame ();
1882 if (frame_id_inner (get_frame_arch (frame
), selected_id
,
1883 get_frame_id (frame
)))
1884 /* Caught in the safety net, oops! We've gone way past the
1886 error (_("Problem while popping stack frames (corrupt stack?)"));
1887 frame_pop (get_current_frame ());
1891 /* Second discard the selected frame (which is now also the current
1893 frame_pop (get_current_frame ());
1895 /* Store RETURN_VALUE in the just-returned register set. */
1896 if (return_value
!= NULL
)
1898 struct type
*return_type
= value_type (return_value
);
1899 struct gdbarch
*gdbarch
= get_regcache_arch (get_current_regcache ());
1900 gdb_assert (gdbarch_return_value (gdbarch
, return_type
, NULL
, NULL
, NULL
)
1901 == RETURN_VALUE_REGISTER_CONVENTION
);
1902 gdbarch_return_value (gdbarch
, return_type
,
1903 get_current_regcache (), NULL
/*read*/,
1904 value_contents (return_value
) /*write*/);
1907 /* If we are at the end of a call dummy now, pop the dummy frame
1909 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1910 frame_pop (get_current_frame ());
1912 /* If interactive, print the frame that is now current. */
1914 frame_command ("0", 1);
1916 select_frame_command ("0", 0);
1919 /* Sets the scope to input function name, provided that the function
1920 is within the current stack frame */
1922 struct function_bounds
1924 CORE_ADDR low
, high
;
1928 func_command (char *arg
, int from_tty
)
1930 struct frame_info
*frame
;
1932 struct symtabs_and_lines sals
;
1935 struct function_bounds
*func_bounds
= NULL
;
1940 frame
= parse_frame_specification ("0");
1941 sals
= decode_line_spec (arg
, 1);
1942 func_bounds
= (struct function_bounds
*) xmalloc (
1943 sizeof (struct function_bounds
) * sals
.nelts
);
1944 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1946 if (sals
.sals
[i
].pc
== 0
1947 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1948 &func_bounds
[i
].low
,
1949 &func_bounds
[i
].high
) == 0)
1951 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1957 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1958 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1959 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1963 frame
= find_relative_frame (frame
, &level
);
1966 while (!found
&& level
== 0);
1969 xfree (func_bounds
);
1972 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1973 else if (frame
!= get_selected_frame (NULL
))
1974 select_and_print_frame (frame
);
1977 /* Gets the language of the current frame. */
1980 get_frame_language (void)
1982 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1986 /* We determine the current frame language by looking up its
1987 associated symtab. To retrieve this symtab, we use the frame
1988 PC. However we cannot use the frame PC as is, because it
1989 usually points to the instruction following the "call", which
1990 is sometimes the first instruction of another function. So
1991 we rely on get_frame_address_in_block(), it provides us with
1992 a PC that is guaranteed to be inside the frame's code
1994 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1995 struct symtab
*s
= find_pc_symtab (pc
);
2001 return language_unknown
;
2005 /* Provide a prototype to silence -Wmissing-prototypes. */
2006 void _initialize_stack (void);
2009 _initialize_stack (void)
2012 backtrace_limit
= 30;
2015 add_com ("return", class_stack
, return_command
, _("\
2016 Make selected stack frame return to its caller.\n\
2017 Control remains in the debugger, but when you continue\n\
2018 execution will resume in the frame above the one now selected.\n\
2019 If an argument is given, it is an expression for the value to return."));
2021 add_com ("up", class_stack
, up_command
, _("\
2022 Select and print stack frame that called this one.\n\
2023 An argument says how many frames up to go."));
2024 add_com ("up-silently", class_support
, up_silently_command
, _("\
2025 Same as the `up' command, but does not print anything.\n\
2026 This is useful in command scripts."));
2028 add_com ("down", class_stack
, down_command
, _("\
2029 Select and print stack frame called by this one.\n\
2030 An argument says how many frames down to go."));
2031 add_com_alias ("do", "down", class_stack
, 1);
2032 add_com_alias ("dow", "down", class_stack
, 1);
2033 add_com ("down-silently", class_support
, down_silently_command
, _("\
2034 Same as the `down' command, but does not print anything.\n\
2035 This is useful in command scripts."));
2037 add_com ("frame", class_stack
, frame_command
, _("\
2038 Select and print a stack frame.\n\
2039 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2040 An argument specifies the frame to select.\n\
2041 It can be a stack frame number or the address of the frame.\n\
2042 With argument, nothing is printed if input is coming from\n\
2043 a command file or a user-defined command."));
2045 add_com_alias ("f", "frame", class_stack
, 1);
2049 add_com ("L", class_stack
, current_frame_command
,
2050 _("Print the current stack frame.\n"));
2051 add_com_alias ("V", "frame", class_stack
, 1);
2053 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2054 Select a stack frame without printing anything.\n\
2055 An argument specifies the frame to select.\n\
2056 It can be a stack frame number or the address of the frame.\n"));
2058 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2059 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2060 With a negative argument, print outermost -COUNT frames.\n\
2061 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2062 add_com_alias ("bt", "backtrace", class_stack
, 0);
2065 add_com_alias ("t", "backtrace", class_stack
, 0);
2066 add_com ("T", class_stack
, backtrace_full_command
, _("\
2067 Print backtrace of all stack frames, or innermost COUNT frames \n\
2068 and the values of the local variables.\n\
2069 With a negative argument, print outermost -COUNT frames.\n\
2070 Usage: T <count>\n"));
2073 add_com_alias ("where", "backtrace", class_alias
, 0);
2074 add_info ("stack", backtrace_command
,
2075 _("Backtrace of the stack, or innermost COUNT frames."));
2076 add_info_alias ("s", "stack", 1);
2077 add_info ("frame", frame_info
,
2078 _("All about selected stack frame, or frame at ADDR."));
2079 add_info_alias ("f", "frame", 1);
2080 add_info ("locals", locals_info
,
2081 _("Local variables of current stack frame."));
2082 add_info ("args", args_info
,
2083 _("Argument variables of current stack frame."));
2085 add_com ("l", class_info
, args_plus_locals_info
,
2086 _("Argument and local variables of current stack frame."));
2089 add_com ("func", class_stack
, func_command
, _("\
2090 Select the stack frame that contains <func>.\n\
2091 Usage: func <name>\n"));
2093 add_info ("catch", catch_info
,
2094 _("Exceptions that can be caught in the current stack frame."));
2096 add_setshow_enum_cmd ("frame-arguments", class_stack
,
2097 print_frame_arguments_choices
, &print_frame_arguments
,
2098 _("Set printing of non-scalar frame arguments"),
2099 _("Show printing of non-scalar frame arguments"),
2100 NULL
, NULL
, NULL
, &setprintlist
, &showprintlist
);
2103 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2104 "Specify maximum number of frames for \"backtrace\" to print by default."),
2106 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2107 The maximum number of frames for \"backtrace\" to print by default."));