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 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
28 #include "expression.h"
35 #include "breakpoint.h"
42 #include "dictionary.h"
43 #include "exceptions.h"
44 #include "reggroups.h"
49 #include "gdb_assert.h"
51 #include "gdb_string.h"
53 void (*deprecated_selected_frame_level_changed_hook
) (int);
55 /* Prototypes for local functions. */
57 static void print_frame_local_vars (struct frame_info
*, int,
60 static void print_frame (struct frame_info
*frame
, int print_level
,
61 enum print_what print_what
, int print_args
,
62 struct symtab_and_line sal
);
64 /* Zero means do things normally; we are interacting directly with the
65 user. One means print the full filename and linenumber when a
66 frame is printed, and do so in a format emacs18/emacs19.22 can
67 parse. Two means print similar annotations, but in many more
68 cases and in a slightly different syntax. */
70 int annotation_level
= 0;
73 struct print_stack_frame_args
75 struct frame_info
*frame
;
77 enum print_what print_what
;
81 /* Show or print the frame arguments; stub for catch_errors. */
84 print_stack_frame_stub (void *args
)
86 struct print_stack_frame_args
*p
= args
;
87 int center
= (p
->print_what
== SRC_LINE
|| p
->print_what
== SRC_AND_LOC
);
89 print_frame_info (p
->frame
, p
->print_level
, p
->print_what
, p
->print_args
);
90 set_current_sal_from_frame (p
->frame
, center
);
94 /* Show or print a stack frame FRAME briefly. The output is format
95 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
96 relative level, function name, argument list, and file name and
97 line number. If the frame's PC is not at the beginning of the
98 source line, the actual PC is printed at the beginning. */
101 print_stack_frame (struct frame_info
*frame
, int print_level
,
102 enum print_what print_what
)
104 struct print_stack_frame_args args
;
107 args
.print_level
= print_level
;
108 args
.print_what
= print_what
;
109 /* For mi, alway print location and address. */
110 args
.print_what
= ui_out_is_mi_like_p (uiout
) ? LOC_AND_ADDRESS
: print_what
;
113 catch_errors (print_stack_frame_stub
, &args
, "", RETURN_MASK_ALL
);
116 struct print_args_args
119 struct frame_info
*frame
;
120 struct ui_file
*stream
;
123 static int print_args_stub (void *args
);
125 /* Print nameless arguments of frame FRAME on STREAM, where START is
126 the offset of the first nameless argument, and NUM is the number of
127 nameless arguments to print. FIRST is nonzero if this is the first
128 argument (not just the first nameless argument). */
131 print_frame_nameless_args (struct frame_info
*frame
, long start
, int num
,
132 int first
, struct ui_file
*stream
)
138 for (i
= 0; i
< num
; i
++)
141 argsaddr
= get_frame_args_address (frame
);
144 arg_value
= read_memory_integer (argsaddr
+ start
, sizeof (int));
146 fprintf_filtered (stream
, ", ");
147 fprintf_filtered (stream
, "%ld", arg_value
);
149 start
+= sizeof (int);
153 /* Print the arguments of frame FRAME on STREAM, given the function
154 FUNC running in that frame (as a symbol), where NUM is the number
155 of arguments according to the stack frame (or -1 if the number of
156 arguments is unknown). */
158 /* Note that currently the "number of argumentss according to the
159 stack frame" is only known on VAX where i refers to the "number of
160 ints of argumentss according to the stack frame". */
163 print_frame_args (struct symbol
*func
, struct frame_info
*frame
,
164 int num
, struct ui_file
*stream
)
167 /* Offset of next stack argument beyond the one we have seen that is
168 at the highest offset, or -1 if we haven't come to a stack
170 long highest_offset
= -1;
171 /* Number of ints of arguments that we have printed so far. */
172 int args_printed
= 0;
173 struct cleanup
*old_chain
, *list_chain
;
174 struct ui_stream
*stb
;
176 stb
= ui_out_stream_new (uiout
);
177 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
181 struct block
*b
= SYMBOL_BLOCK_VALUE (func
);
182 struct dict_iterator iter
;
186 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
190 /* Keep track of the highest stack argument offset seen, and
191 skip over any kinds of symbols we don't care about. */
193 switch (SYMBOL_CLASS (sym
))
198 long current_offset
= SYMBOL_VALUE (sym
);
199 int arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
201 /* Compute address of next argument by adding the size of
202 this argument and rounding to an int boundary. */
204 ((current_offset
+ arg_size
+ sizeof (int) - 1)
205 & ~(sizeof (int) - 1));
207 /* If this is the highest offset seen yet, set
209 if (highest_offset
== -1
210 || (current_offset
> highest_offset
))
211 highest_offset
= current_offset
;
213 /* Add the number of ints we're about to print to
215 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
218 /* We care about types of symbols, but don't need to
219 keep track of stack offsets in them. */
221 case LOC_REGPARM_ADDR
:
223 case LOC_BASEREG_ARG
:
224 case LOC_COMPUTED_ARG
:
227 /* Other types of symbols we just skip over. */
232 /* We have to look up the symbol because arguments can have
233 two entries (one a parameter, one a local) and the one we
234 want is the local, which lookup_symbol will find for us.
235 This includes gcc1 (not gcc2) on SPARC when passing a
236 small structure and gcc2 when the argument type is float
237 and it is passed as a double and converted to float by
238 the prologue (in the latter case the type of the LOC_ARG
239 symbol is double and the type of the LOC_LOCAL symbol is
241 /* But if the parameter name is null, don't try it. Null
242 parameter names occur on the RS/6000, for traceback
243 tables. FIXME, should we even print them? */
245 if (*DEPRECATED_SYMBOL_NAME (sym
))
248 nsym
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
249 b
, VAR_DOMAIN
, NULL
, NULL
);
250 gdb_assert (nsym
!= NULL
);
251 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
)
253 /* There is a LOC_ARG/LOC_REGISTER pair. This means
254 that it was passed on the stack and loaded into a
255 register, or passed in a register and stored in a
256 stack slot. GDB 3.x used the LOC_ARG; GDB
257 4.0-4.11 used the LOC_REGISTER.
259 Reasons for using the LOC_ARG:
261 (1) Because find_saved_registers may be slow for
264 (2) Because registers are often re-used and stack
265 slots rarely (never?) are. Therefore using
266 the stack slot is much less likely to print
269 Reasons why we might want to use the LOC_REGISTER:
271 (1) So that the backtrace prints the same value
272 as "print foo". I see no compelling reason
273 why this needs to be the case; having the
274 backtrace print the value which was passed
275 in, and "print foo" print the value as
276 modified within the called function, makes
279 Additional note: It might be nice if "info args"
280 displayed both values.
282 One more note: There is a case with SPARC
283 structure passing where we need to use the
284 LOC_REGISTER, but this is dealt with by creating
285 a single LOC_REGPARM in symbol reading. */
287 /* Leave sym (the LOC_ARG) alone. */
294 /* Print the current arg. */
296 ui_out_text (uiout
, ", ");
297 ui_out_wrap_hint (uiout
, " ");
299 annotate_arg_begin ();
301 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
302 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
303 SYMBOL_LANGUAGE (sym
),
304 DMGL_PARAMS
| DMGL_ANSI
);
305 ui_out_field_stream (uiout
, "name", stb
);
306 annotate_arg_name_end ();
307 ui_out_text (uiout
, "=");
309 /* Avoid value_print because it will deref ref parameters.
310 We just want to print their addresses. Print ??? for
311 args whose address we do not know. We pass 2 as
312 "recurse" to val_print because our standard indentation
313 here is 4 spaces, and val_print indents 2 for each
315 val
= read_var_value (sym
, frame
);
317 annotate_arg_value (val
== NULL
? NULL
: value_type (val
));
321 common_val_print (val
, stb
->stream
, 0, 0, 2, Val_no_prettyprint
);
322 ui_out_field_stream (uiout
, "value", stb
);
325 ui_out_text (uiout
, "???");
327 /* Invoke ui_out_tuple_end. */
328 do_cleanups (list_chain
);
336 /* Don't print nameless args in situations where we don't know
337 enough about the stack to find them. */
342 if (highest_offset
== -1)
343 start
= gdbarch_frame_args_skip (current_gdbarch
);
345 start
= highest_offset
;
347 print_frame_nameless_args (frame
, start
, num
- args_printed
,
351 do_cleanups (old_chain
);
354 /* Stub for catch_errors. */
357 print_args_stub (void *args
)
359 struct print_args_args
*p
= args
;
362 if (gdbarch_frame_num_args_p (current_gdbarch
))
364 numargs
= gdbarch_frame_num_args (current_gdbarch
, p
->frame
);
365 gdb_assert (numargs
>= 0);
369 print_frame_args (p
->func
, p
->frame
, numargs
, p
->stream
);
373 /* Set the current source and line to the location given by frame
374 FRAME, if possible. When CENTER is true, adjust so the relevant
375 line is in the center of the next 'list'. */
378 set_current_sal_from_frame (struct frame_info
*frame
, int center
)
380 struct symtab_and_line sal
;
382 find_frame_sal (frame
, &sal
);
386 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
387 set_current_source_symtab_and_line (&sal
);
391 /* Print information about frame FRAME. The output is format according
392 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
395 SRC_LINE: Print only source line.
396 LOCATION: Print only location.
397 LOC_AND_SRC: Print location and source line.
399 Used in "where" output, and to emit breakpoint or step
403 print_frame_info (struct frame_info
*frame
, int print_level
,
404 enum print_what print_what
, int print_args
)
406 struct symtab_and_line sal
;
410 if (get_frame_type (frame
) == DUMMY_FRAME
411 || get_frame_type (frame
) == SIGTRAMP_FRAME
)
413 struct cleanup
*uiout_cleanup
414 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
416 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
417 get_frame_pc (frame
));
419 /* Do this regardless of SOURCE because we don't have any source
420 to list for this frame. */
423 ui_out_text (uiout
, "#");
424 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
425 frame_relative_level (frame
));
427 if (ui_out_is_mi_like_p (uiout
))
429 annotate_frame_address ();
430 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
431 annotate_frame_address_end ();
434 if (get_frame_type (frame
) == DUMMY_FRAME
)
436 annotate_function_call ();
437 ui_out_field_string (uiout
, "func", "<function called from gdb>");
439 else if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
441 annotate_signal_handler_caller ();
442 ui_out_field_string (uiout
, "func", "<signal handler called>");
444 ui_out_text (uiout
, "\n");
445 annotate_frame_end ();
447 do_cleanups (uiout_cleanup
);
451 /* If FRAME is not the innermost frame, that normally means that
452 FRAME->pc points to *after* the call instruction, and we want to
453 get the line containing the call, never the next line. But if
454 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
455 next frame was not entered as the result of a call, and we want
456 to get the line containing FRAME->pc. */
457 find_frame_sal (frame
, &sal
);
459 location_print
= (print_what
== LOCATION
460 || print_what
== LOC_AND_ADDRESS
461 || print_what
== SRC_AND_LOC
);
463 if (location_print
|| !sal
.symtab
)
464 print_frame (frame
, print_level
, print_what
, print_args
, sal
);
466 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
468 if (source_print
&& sal
.symtab
)
471 int mid_statement
= ((print_what
== SRC_LINE
)
472 && (get_frame_pc (frame
) != sal
.pc
));
474 if (annotation_level
)
475 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
476 get_frame_pc (frame
));
479 if (deprecated_print_frame_info_listing_hook
)
480 deprecated_print_frame_info_listing_hook (sal
.symtab
,
485 /* We used to do this earlier, but that is clearly
486 wrong. This function is used by many different
487 parts of gdb, including normal_stop in infrun.c,
488 which uses this to print out the current PC
489 when we stepi/nexti into the middle of a source
490 line. Only the command line really wants this
491 behavior. Other UIs probably would like the
492 ability to decide for themselves if it is desired. */
493 if (addressprint
&& mid_statement
)
495 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
496 ui_out_text (uiout
, "\t");
499 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
504 if (print_what
!= LOCATION
)
505 set_default_breakpoint (1, get_frame_pc (frame
), sal
.symtab
, sal
.line
);
507 annotate_frame_end ();
509 gdb_flush (gdb_stdout
);
513 print_frame (struct frame_info
*frame
, int print_level
,
514 enum print_what print_what
, int print_args
,
515 struct symtab_and_line sal
)
518 char *funname
= NULL
;
519 enum language funlang
= language_unknown
;
520 struct ui_stream
*stb
;
521 struct cleanup
*old_chain
, *list_chain
;
523 stb
= ui_out_stream_new (uiout
);
524 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
526 func
= find_pc_function (get_frame_address_in_block (frame
));
529 /* In certain pathological cases, the symtabs give the wrong
530 function (when we are in the first function in a file which
531 is compiled without debugging symbols, the previous function
532 is compiled with debugging symbols, and the "foo.o" symbol
533 that is supposed to tell us where the file with debugging
534 symbols ends has been truncated by ar because it is longer
535 than 15 characters). This also occurs if the user uses asm()
536 to create a function but not stabs for it (in a file compiled
539 So look in the minimal symbol tables as well, and if it comes
540 up with a larger address for the function use that instead.
541 I don't think this can ever cause any problems; there
542 shouldn't be any minimal symbols in the middle of a function;
543 if this is ever changed many parts of GDB will need to be
544 changed (and we'll create a find_pc_minimal_function or some
547 struct minimal_symbol
*msymbol
=
548 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
551 && (SYMBOL_VALUE_ADDRESS (msymbol
)
552 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
554 /* We also don't know anything about the function besides
555 its address and name. */
557 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
558 funlang
= SYMBOL_LANGUAGE (msymbol
);
562 funname
= DEPRECATED_SYMBOL_NAME (func
);
563 funlang
= SYMBOL_LANGUAGE (func
);
564 if (funlang
== language_cplus
)
566 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
567 to display the demangled name that we already have
568 stored in the symbol table, but we stored a version
569 with DMGL_PARAMS turned on, and here we don't want to
570 display parameters. So call the demangler again, with
573 Yes, printf_symbol_filtered() will again try to
574 demangle the name on the fly, but the issue is that
575 if cplus_demangle() fails here, it will fail there
576 too. So we want to catch the failure (where DEMANGLED
577 is NULL below) here, while we still have our hands on
578 the function symbol.) */
579 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
580 if (demangled
== NULL
)
581 /* If the demangler fails, try the demangled name from
582 the symbol table. That'll have parameters, but
583 that's preferable to displaying a mangled name. */
584 funname
= SYMBOL_PRINT_NAME (func
);
592 struct minimal_symbol
*msymbol
=
593 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
597 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
598 funlang
= SYMBOL_LANGUAGE (msymbol
);
602 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
603 get_frame_pc (frame
));
605 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
609 ui_out_text (uiout
, "#");
610 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
611 frame_relative_level (frame
));
614 if (get_frame_pc (frame
) != sal
.pc
|| !sal
.symtab
615 || print_what
== LOC_AND_ADDRESS
)
617 annotate_frame_address ();
618 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
619 annotate_frame_address_end ();
620 ui_out_text (uiout
, " in ");
622 annotate_frame_function_name ();
623 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
625 ui_out_field_stream (uiout
, "func", stb
);
626 ui_out_wrap_hint (uiout
, " ");
627 annotate_frame_args ();
629 ui_out_text (uiout
, " (");
632 struct print_args_args args
;
633 struct cleanup
*args_list_chain
;
636 args
.stream
= gdb_stdout
;
637 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
638 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
639 /* FIXME: ARGS must be a list. If one argument is a string it
640 will have " that will not be properly escaped. */
641 /* Invoke ui_out_tuple_end. */
642 do_cleanups (args_list_chain
);
645 ui_out_text (uiout
, ")");
646 if (sal
.symtab
&& sal
.symtab
->filename
)
648 annotate_frame_source_begin ();
649 ui_out_wrap_hint (uiout
, " ");
650 ui_out_text (uiout
, " at ");
651 annotate_frame_source_file ();
652 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
653 if (ui_out_is_mi_like_p (uiout
))
655 const char *fullname
= symtab_to_fullname (sal
.symtab
);
656 if (fullname
!= NULL
)
657 ui_out_field_string (uiout
, "fullname", fullname
);
659 annotate_frame_source_file_end ();
660 ui_out_text (uiout
, ":");
661 annotate_frame_source_line ();
662 ui_out_field_int (uiout
, "line", sal
.line
);
663 annotate_frame_source_end ();
666 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
669 char *lib
= PC_SOLIB (get_frame_pc (frame
));
671 char *lib
= solib_address (get_frame_pc (frame
));
675 annotate_frame_where ();
676 ui_out_wrap_hint (uiout
, " ");
677 ui_out_text (uiout
, " from ");
678 ui_out_field_string (uiout
, "from", lib
);
682 /* do_cleanups will call ui_out_tuple_end() for us. */
683 do_cleanups (list_chain
);
684 ui_out_text (uiout
, "\n");
685 do_cleanups (old_chain
);
688 /* Show the frame info. If this is the tui, it will be shown in the
689 source display otherwise, nothing is done. */
692 show_stack_frame (struct frame_info
*frame
)
697 /* Read a frame specification in whatever the appropriate format is
698 from FRAME_EXP. Call error(), printing MESSAGE, if the
699 specification is in any way invalid (so this function never returns
700 NULL). When SEPECTED_P is non-NULL set its target to indicate that
701 the default selected frame was used. */
703 static struct frame_info
*
704 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
705 int *selected_frame_p
)
708 struct value
*args
[4];
709 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
711 if (frame_exp
== NULL
)
716 struct cleanup
*tmp_cleanup
;
722 struct cleanup
*cleanup
;
725 /* Skip leading white space, bail of EOL. */
726 while (isspace (*frame_exp
))
731 /* Parse the argument, extract it, save it. */
735 addr_string
= savestring (frame_exp
, p
- frame_exp
);
737 cleanup
= make_cleanup (xfree
, addr_string
);
739 /* NOTE: Parse and evaluate expression, but do not use
740 functions such as parse_and_eval_long or
741 parse_and_eval_address to also extract the value.
742 Instead value_as_long and value_as_address are used.
743 This avoids problems with expressions that contain
745 if (numargs
>= ARRAY_SIZE (args
))
746 error (_("Too many args in frame specification"));
747 args
[numargs
++] = parse_and_eval (addr_string
);
749 do_cleanups (cleanup
);
753 /* If no args, default to the selected frame. */
756 if (selected_frame_p
!= NULL
)
757 (*selected_frame_p
) = 1;
758 return get_selected_frame (message
);
761 /* None of the remaining use the selected frame. */
762 if (selected_frame_p
!= NULL
)
763 (*selected_frame_p
) = 0;
765 /* Assume the single arg[0] is an integer, and try using that to
766 select a frame relative to current. */
769 struct frame_info
*fid
;
770 int level
= value_as_long (args
[0]);
771 fid
= find_relative_frame (get_current_frame (), &level
);
773 /* find_relative_frame was successful */
777 /* Convert each value into a corresponding address. */
780 for (i
= 0; i
< numargs
; i
++)
781 addrs
[i
] = value_as_address (args
[0]);
784 /* Assume that the single arg[0] is an address, use that to identify
785 a frame with a matching ID. Should this also accept stack/pc or
789 struct frame_id id
= frame_id_build_wild (addrs
[0]);
790 struct frame_info
*fid
;
792 /* If (s)he specifies the frame with an address, he deserves
793 what (s)he gets. Still, give the highest one that matches.
794 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
796 for (fid
= get_current_frame ();
798 fid
= get_prev_frame (fid
))
800 if (frame_id_eq (id
, get_frame_id (fid
)))
802 while (frame_id_eq (id
, frame_unwind_id (fid
)))
803 fid
= get_prev_frame (fid
);
809 /* We couldn't identify the frame as an existing frame, but
810 perhaps we can create one with a single argument. */
812 return create_new_frame (addrs
[0], 0);
813 else if (numargs
== 2)
814 return create_new_frame (addrs
[0], addrs
[1]);
816 error (_("Too many args in frame specification"));
819 static struct frame_info
*
820 parse_frame_specification (char *frame_exp
)
822 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
825 /* Print verbosely the selected frame or the frame at address
826 ADDR_EXP. Absolutely all information in the frame is printed. */
829 frame_info (char *addr_exp
, int from_tty
)
831 struct frame_info
*fi
;
832 struct symtab_and_line sal
;
835 struct frame_info
*calling_frame_info
;
836 int i
, count
, numregs
;
838 enum language funlang
= language_unknown
;
839 const char *pc_regname
;
840 int selected_frame_p
;
842 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
844 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
845 is not a good name. */
846 if (gdbarch_pc_regnum (current_gdbarch
) >= 0)
847 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
848 easily not match that of the internal value returned by
850 pc_regname
= gdbarch_register_name (current_gdbarch
,
851 gdbarch_pc_regnum (current_gdbarch
));
853 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
854 architectures will often have a hardware register called "pc",
855 and that register's value, again, can easily not match
859 find_frame_sal (fi
, &sal
);
860 func
= get_frame_function (fi
);
861 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
863 s
= find_pc_symtab (get_frame_pc (fi
));
866 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
867 display the demangled name that we already have stored in the
868 symbol table, but we stored a version with DMGL_PARAMS turned
869 on, and here we don't want to display parameters. So call the
870 demangler again, with DMGL_ANSI only.
872 Yes, printf_symbol_filtered() will again try to demangle the
873 name on the fly, but the issue is that if cplus_demangle()
874 fails here, it will fail there too. So we want to catch the
875 failure (where DEMANGLED is NULL below) here, while we still
876 have our hands on the function symbol.) */
877 funname
= DEPRECATED_SYMBOL_NAME (func
);
878 funlang
= SYMBOL_LANGUAGE (func
);
879 if (funlang
== language_cplus
)
881 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
882 /* If the demangler fails, try the demangled name from the
883 symbol table. That'll have parameters, but that's
884 preferable to displaying a mangled name. */
885 if (demangled
== NULL
)
886 funname
= SYMBOL_PRINT_NAME (func
);
893 struct minimal_symbol
*msymbol
;
895 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
898 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
899 funlang
= SYMBOL_LANGUAGE (msymbol
);
902 calling_frame_info
= get_prev_frame (fi
);
904 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
906 printf_filtered (_("Stack level %d, frame at "),
907 frame_relative_level (fi
));
911 printf_filtered (_("Stack frame at "));
913 deprecated_print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
914 printf_filtered (":\n");
915 printf_filtered (" %s = ", pc_regname
);
916 deprecated_print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
921 printf_filtered (" in ");
922 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
923 DMGL_ANSI
| DMGL_PARAMS
);
927 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
928 puts_filtered ("; ");
930 printf_filtered ("saved %s ", pc_regname
);
931 deprecated_print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
932 printf_filtered ("\n");
934 if (calling_frame_info
== NULL
)
936 enum unwind_stop_reason reason
;
938 reason
= get_frame_unwind_stop_reason (fi
);
939 if (reason
!= UNWIND_NO_REASON
)
940 printf_filtered (_(" Outermost frame: %s\n"),
941 frame_stop_reason_string (reason
));
944 if (calling_frame_info
)
946 printf_filtered (" called by frame at ");
947 deprecated_print_address_numeric (get_frame_base (calling_frame_info
),
950 if (get_next_frame (fi
) && calling_frame_info
)
953 if (get_next_frame (fi
))
955 printf_filtered (" caller of frame at ");
956 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
959 if (get_next_frame (fi
) || calling_frame_info
)
960 puts_filtered ("\n");
963 printf_filtered (" source language %s.\n",
964 language_str (s
->language
));
967 /* Address of the argument list for this frame, or 0. */
968 CORE_ADDR arg_list
= get_frame_args_address (fi
);
969 /* Number of args for this frame, or -1 if unknown. */
973 printf_filtered (" Arglist at unknown address.\n");
976 printf_filtered (" Arglist at ");
977 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
978 printf_filtered (",");
980 if (!gdbarch_frame_num_args_p (current_gdbarch
))
983 puts_filtered (" args: ");
987 numargs
= gdbarch_frame_num_args (current_gdbarch
, fi
);
988 gdb_assert (numargs
>= 0);
990 puts_filtered (" no args.");
991 else if (numargs
== 1)
992 puts_filtered (" 1 arg: ");
994 printf_filtered (" %d args: ", numargs
);
996 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
997 puts_filtered ("\n");
1001 /* Address of the local variables for this frame, or 0. */
1002 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1005 printf_filtered (" Locals at unknown address,");
1008 printf_filtered (" Locals at ");
1009 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1010 printf_filtered (",");
1014 /* Print as much information as possible on the location of all the
1017 enum lval_type lval
;
1025 /* The sp is special; what's displayed isn't the save address, but
1026 the value of the previous frame's sp. This is a legacy thing,
1027 at one stage the frame cached the previous frame's SP instead
1028 of its address, hence it was easiest to just display the cached
1030 if (gdbarch_sp_regnum (current_gdbarch
) >= 0)
1032 /* Find out the location of the saved stack pointer with out
1033 actually evaluating it. */
1034 frame_register_unwind (fi
, gdbarch_sp_regnum (current_gdbarch
),
1035 &optimized
, &lval
, &addr
,
1037 if (!optimized
&& lval
== not_lval
)
1039 gdb_byte value
[MAX_REGISTER_SIZE
];
1041 frame_register_unwind (fi
, gdbarch_sp_regnum (current_gdbarch
),
1042 &optimized
, &lval
, &addr
,
1044 /* NOTE: cagney/2003-05-22: This is assuming that the
1045 stack pointer was packed as an unsigned integer. That
1046 may or may not be valid. */
1047 sp
= extract_unsigned_integer (value
,
1048 register_size (current_gdbarch
,
1049 gdbarch_sp_regnum (current_gdbarch
)));
1050 printf_filtered (" Previous frame's sp is ");
1051 deprecated_print_address_numeric (sp
, 1, gdb_stdout
);
1052 printf_filtered ("\n");
1055 else if (!optimized
&& lval
== lval_memory
)
1057 printf_filtered (" Previous frame's sp at ");
1058 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1059 printf_filtered ("\n");
1062 else if (!optimized
&& lval
== lval_register
)
1064 printf_filtered (" Previous frame's sp in %s\n",
1065 gdbarch_register_name (current_gdbarch
, realnum
));
1068 /* else keep quiet. */
1072 numregs
= gdbarch_num_regs (current_gdbarch
)
1073 + gdbarch_num_pseudo_regs (current_gdbarch
);
1074 for (i
= 0; i
< numregs
; i
++)
1075 if (i
!= gdbarch_sp_regnum (current_gdbarch
)
1076 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1078 /* Find out the location of the saved register without
1079 fetching the corresponding value. */
1080 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1082 /* For moment, only display registers that were saved on the
1084 if (!optimized
&& lval
== lval_memory
)
1087 puts_filtered (" Saved registers:\n ");
1089 puts_filtered (",");
1091 printf_filtered (" %s at ",
1092 gdbarch_register_name (current_gdbarch
, i
));
1093 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1097 if (count
|| need_nl
)
1098 puts_filtered ("\n");
1102 /* Print briefly all stack frames or just the innermost COUNT_EXP
1106 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1108 struct frame_info
*fi
;
1111 struct frame_info
*trailing
;
1114 if (!target_has_stack
)
1115 error (_("No stack."));
1117 /* The following code must do two things. First, it must set the
1118 variable TRAILING to the frame from which we should start
1119 printing. Second, it must set the variable count to the number
1120 of frames which we should print, or -1 if all of them. */
1121 trailing
= get_current_frame ();
1123 /* The target can be in a state where there is no valid frames
1124 (e.g., just connected). */
1125 if (trailing
== NULL
)
1126 error (_("No stack."));
1131 count
= parse_and_eval_long (count_exp
);
1134 struct frame_info
*current
;
1139 while (current
&& count
--)
1142 current
= get_prev_frame (current
);
1145 /* Will stop when CURRENT reaches the top of the stack.
1146 TRAILING will be COUNT below it. */
1150 trailing
= get_prev_frame (trailing
);
1151 current
= get_prev_frame (current
);
1163 struct partial_symtab
*ps
;
1165 /* Read in symbols for all of the frames. Need to do this in a
1166 separate pass so that "Reading in symbols for xxx" messages
1167 don't screw up the appearance of the backtrace. Also if
1168 people have strong opinions against reading symbols for
1169 backtrace this may have to be an option. */
1171 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1174 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1176 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1180 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1184 /* Don't use print_stack_frame; if an error() occurs it probably
1185 means further attempts to backtrace would fail (on the other
1186 hand, perhaps the code does or could be fixed to make sure
1187 the frame->prev field gets set to NULL in that case). */
1188 print_frame_info (fi
, 1, LOCATION
, 1);
1190 print_frame_local_vars (fi
, 1, gdb_stdout
);
1192 /* Save the last frame to check for error conditions. */
1196 /* If we've stopped before the end, mention that. */
1198 printf_filtered (_("(More stack frames follow...)\n"));
1200 /* If we've run out of frames, and the reason appears to be an error
1201 condition, print it. */
1202 if (fi
== NULL
&& trailing
!= NULL
)
1204 enum unwind_stop_reason reason
;
1206 reason
= get_frame_unwind_stop_reason (trailing
);
1207 if (reason
> UNWIND_FIRST_ERROR
)
1208 printf_filtered (_("Backtrace stopped: %s\n"),
1209 frame_stop_reason_string (reason
));
1213 struct backtrace_command_args
1220 /* Stub for catch_errors. */
1223 backtrace_command_stub (void *data
)
1225 struct backtrace_command_args
*args
= data
;
1226 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1231 backtrace_command (char *arg
, int from_tty
)
1233 struct cleanup
*old_chain
= NULL
;
1234 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1235 struct backtrace_command_args btargs
;
1242 argv
= buildargv (arg
);
1243 old_chain
= make_cleanup_freeargv (argv
);
1245 for (i
= 0; argv
[i
]; i
++)
1249 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1250 argv
[i
][j
] = tolower (argv
[i
][j
]);
1252 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1253 fulltrace_arg
= argc
;
1256 arglen
+= strlen (argv
[i
]);
1261 if (fulltrace_arg
>= 0)
1265 arg
= xmalloc (arglen
+ 1);
1266 memset (arg
, 0, arglen
+ 1);
1267 for (i
= 0; i
< (argc
+ 1); i
++)
1269 if (i
!= fulltrace_arg
)
1271 strcat (arg
, argv
[i
]);
1281 btargs
.count_exp
= arg
;
1282 btargs
.show_locals
= (fulltrace_arg
>= 0);
1283 btargs
.from_tty
= from_tty
;
1284 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1286 if (fulltrace_arg
>= 0 && arglen
> 0)
1290 do_cleanups (old_chain
);
1294 backtrace_full_command (char *arg
, int from_tty
)
1296 struct backtrace_command_args btargs
;
1297 btargs
.count_exp
= arg
;
1298 btargs
.show_locals
= 1;
1299 btargs
.from_tty
= from_tty
;
1300 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1304 /* Print the local variables of a block B active in FRAME on STREAM.
1305 Return 1 if any variables were printed; 0 otherwise. */
1308 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1309 int num_tabs
, struct ui_file
*stream
)
1311 struct dict_iterator iter
;
1313 int values_printed
= 0;
1316 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1318 switch (SYMBOL_CLASS (sym
))
1326 for (j
= 0; j
< num_tabs
; j
++)
1327 fputs_filtered ("\t", stream
);
1328 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1329 fputs_filtered (" = ", stream
);
1330 print_variable_value (sym
, frame
, stream
);
1331 fprintf_filtered (stream
, "\n");
1335 /* Ignore symbols which are not locals. */
1340 return values_printed
;
1343 /* Same, but print labels. */
1346 print_block_frame_labels (struct block
*b
, int *have_default
,
1347 struct ui_file
*stream
)
1349 struct dict_iterator iter
;
1351 int values_printed
= 0;
1353 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1355 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1361 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1363 struct symtab_and_line sal
;
1364 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1366 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1369 fprintf_filtered (stream
, " ");
1370 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1372 fprintf_filtered (stream
, " in file %s, line %d\n",
1373 sal
.symtab
->filename
, sal
.line
);
1377 return values_printed
;
1380 /* Print on STREAM all the local variables in frame FRAME, including
1381 all the blocks active in that frame at its current PC.
1383 Returns 1 if the job was done, or 0 if nothing was printed because
1384 we have no info on the function running in FRAME. */
1387 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1388 struct ui_file
*stream
)
1390 struct block
*block
= get_frame_block (frame
, 0);
1391 int values_printed
= 0;
1395 fprintf_filtered (stream
, "No symbol table info available.\n");
1401 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1403 /* After handling the function's top-level block, stop. Don't
1404 continue to its superblock, the block of per-file symbols. */
1405 if (BLOCK_FUNCTION (block
))
1407 block
= BLOCK_SUPERBLOCK (block
);
1410 if (!values_printed
)
1411 fprintf_filtered (stream
, _("No locals.\n"));
1414 /* Same, but print labels. */
1417 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1418 struct ui_file
*stream
)
1420 struct blockvector
*bl
;
1421 struct block
*block
= get_frame_block (frame
, 0);
1422 int values_printed
= 0;
1423 int index
, have_default
= 0;
1424 char *blocks_printed
;
1425 CORE_ADDR pc
= get_frame_pc (frame
);
1429 fprintf_filtered (stream
, "No symbol table info available.\n");
1433 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1434 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1435 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1439 CORE_ADDR end
= BLOCK_END (block
) - 4;
1442 if (bl
!= blockvector_for_pc (end
, &index
))
1443 error (_("blockvector blotch"));
1444 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1445 error (_("blockvector botch"));
1446 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1449 /* Don't print out blocks that have gone by. */
1450 while (index
< last_index
1451 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1454 while (index
< last_index
1455 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1457 if (blocks_printed
[index
] == 0)
1459 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1460 &have_default
, stream
))
1462 blocks_printed
[index
] = 1;
1468 if (values_printed
&& this_level_only
)
1471 /* After handling the function's top-level block, stop. Don't
1472 continue to its superblock, the block of per-file symbols. */
1473 if (BLOCK_FUNCTION (block
))
1475 block
= BLOCK_SUPERBLOCK (block
);
1478 if (!values_printed
&& !this_level_only
)
1479 fprintf_filtered (stream
, _("No catches.\n"));
1483 locals_info (char *args
, int from_tty
)
1485 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1490 catch_info (char *ignore
, int from_tty
)
1492 struct symtab_and_line
*sal
;
1494 /* Check for target support for exception handling */
1495 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1498 /* Currently not handling this. Ideally, here we should
1499 interact with the C++ runtime system to find the list of
1500 active handlers, etc. */
1501 fprintf_filtered (gdb_stdout
, _("\
1502 Info catch not supported with this target/compiler combination.\n"));
1506 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1507 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1513 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1515 struct symbol
*func
= get_frame_function (frame
);
1517 struct dict_iterator iter
;
1518 struct symbol
*sym
, *sym2
;
1519 int values_printed
= 0;
1523 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1527 b
= SYMBOL_BLOCK_VALUE (func
);
1528 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1530 switch (SYMBOL_CLASS (sym
))
1536 case LOC_REGPARM_ADDR
:
1537 case LOC_BASEREG_ARG
:
1538 case LOC_COMPUTED_ARG
:
1540 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1541 fputs_filtered (" = ", stream
);
1543 /* We have to look up the symbol because arguments can have
1544 two entries (one a parameter, one a local) and the one we
1545 want is the local, which lookup_symbol will find for us.
1546 This includes gcc1 (not gcc2) on the sparc when passing a
1547 small structure and gcc2 when the argument type is float
1548 and it is passed as a double and converted to float by
1549 the prologue (in the latter case the type of the LOC_ARG
1550 symbol is double and the type of the LOC_LOCAL symbol is
1551 float). There are also LOC_ARG/LOC_REGISTER pairs which
1552 are not combined in symbol-reading. */
1554 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1555 b
, VAR_DOMAIN
, NULL
, NULL
);
1556 print_variable_value (sym2
, frame
, stream
);
1557 fprintf_filtered (stream
, "\n");
1561 /* Don't worry about things which aren't arguments. */
1566 if (!values_printed
)
1567 fprintf_filtered (stream
, _("No arguments.\n"));
1571 args_info (char *ignore
, int from_tty
)
1573 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1579 args_plus_locals_info (char *ignore
, int from_tty
)
1581 args_info (ignore
, from_tty
);
1582 locals_info (ignore
, from_tty
);
1586 /* Select frame FRAME. Also print the stack frame and show the source
1587 if this is the tui version. */
1589 select_and_print_frame (struct frame_info
*frame
)
1591 select_frame (frame
);
1593 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1596 /* Return the symbol-block in which the selected frame is executing.
1597 Can return zero under various legitimate circumstances.
1599 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1600 code address within the block returned. We use this to decide
1601 which macros are in scope. */
1604 get_selected_block (CORE_ADDR
*addr_in_block
)
1606 if (!target_has_stack
)
1609 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1612 /* Find a frame a certain number of levels away from FRAME.
1613 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1614 Positive means go to earlier frames (up); negative, the reverse.
1615 The int that contains the number of levels is counted toward
1616 zero as the frames for those levels are found.
1617 If the top or bottom frame is reached, that frame is returned,
1618 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1619 how much farther the original request asked to go. */
1622 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1624 /* Going up is simple: just call get_prev_frame enough times or
1625 until the initial frame is reached. */
1626 while (*level_offset_ptr
> 0)
1628 struct frame_info
*prev
= get_prev_frame (frame
);
1631 (*level_offset_ptr
)--;
1635 /* Going down is just as simple. */
1636 while (*level_offset_ptr
< 0)
1638 struct frame_info
*next
= get_next_frame (frame
);
1641 (*level_offset_ptr
)++;
1648 /* The "select_frame" command. With no argument this is a NOP.
1649 Select the frame at level LEVEL_EXP if it is a valid level.
1650 Otherwise, treat LEVEL_EXP as an address expression and select it.
1652 See parse_frame_specification for more info on proper frame
1656 select_frame_command (char *level_exp
, int from_tty
)
1658 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1661 /* The "frame" command. With no argument, print the selected frame
1662 briefly. With an argument, behave like select_frame and then print
1663 the selected frame. */
1666 frame_command (char *level_exp
, int from_tty
)
1668 select_frame_command (level_exp
, from_tty
);
1669 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1672 /* The XDB Compatibility command to print the current frame. */
1675 current_frame_command (char *level_exp
, int from_tty
)
1677 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1680 /* Select the frame up one or COUNT_EXP stack levels from the
1681 previously selected frame, and print it briefly. */
1684 up_silently_base (char *count_exp
)
1686 struct frame_info
*frame
;
1690 count
= parse_and_eval_long (count_exp
);
1692 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1693 if (count
!= 0 && count_exp
== NULL
)
1694 error (_("Initial frame selected; you cannot go up."));
1695 select_frame (frame
);
1699 up_silently_command (char *count_exp
, int from_tty
)
1701 up_silently_base (count_exp
);
1705 up_command (char *count_exp
, int from_tty
)
1707 up_silently_base (count_exp
);
1708 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1711 /* Select the frame down one or COUNT_EXP stack levels from the previously
1712 selected frame, and print it briefly. */
1715 down_silently_base (char *count_exp
)
1717 struct frame_info
*frame
;
1720 count
= -parse_and_eval_long (count_exp
);
1722 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1723 if (count
!= 0 && count_exp
== NULL
)
1725 /* We only do this if COUNT_EXP is not specified. That way
1726 "down" means to really go down (and let me know if that is
1727 impossible), but "down 9999" can be used to mean go all the
1728 way down without getting an error. */
1730 error (_("Bottom (innermost) frame selected; you cannot go down."));
1733 select_frame (frame
);
1737 down_silently_command (char *count_exp
, int from_tty
)
1739 down_silently_base (count_exp
);
1743 down_command (char *count_exp
, int from_tty
)
1745 down_silently_base (count_exp
);
1746 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1751 return_command (char *retval_exp
, int from_tty
)
1753 struct symbol
*thisfun
;
1754 struct value
*return_value
= NULL
;
1755 const char *query_prefix
= "";
1757 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1759 /* Compute the return value. If the computation triggers an error,
1760 let it bail. If the return type can't be handled, set
1761 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1765 struct type
*return_type
= NULL
;
1767 /* Compute the return value. Should the computation fail, this
1768 call throws an error. */
1769 return_value
= parse_and_eval (retval_exp
);
1771 /* Cast return value to the return type of the function. Should
1772 the cast fail, this call throws an error. */
1773 if (thisfun
!= NULL
)
1774 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1775 if (return_type
== NULL
)
1776 return_type
= builtin_type_int
;
1777 CHECK_TYPEDEF (return_type
);
1778 return_value
= value_cast (return_type
, return_value
);
1780 /* Make sure the value is fully evaluated. It may live in the
1781 stack frame we're about to pop. */
1782 if (value_lazy (return_value
))
1783 value_fetch_lazy (return_value
);
1785 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1786 /* If the return-type is "void", don't try to find the
1787 return-value's location. However, do still evaluate the
1788 return expression so that, even when the expression result
1789 is discarded, side effects such as "return i++" still
1791 return_value
= NULL
;
1792 /* FIXME: cagney/2004-01-17: If the architecture implements both
1793 return_value and extract_returned_value_address, should allow
1794 "return" to work - don't set return_value to NULL. */
1795 else if (!gdbarch_return_value_p (current_gdbarch
)
1796 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1797 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1799 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1800 code. Old architectures don't expect gdbarch_store_return_value
1801 to be called with with a small struct that needs to be
1802 stored in registers. Don't start doing it now. */
1804 A structure or union return type is not supported by this architecture.\n\
1805 If you continue, the return value that you specified will be ignored.\n";
1806 return_value
= NULL
;
1808 else if (using_struct_return (return_type
, 0))
1811 The location at which to store the function's return value is unknown.\n\
1812 If you continue, the return value that you specified will be ignored.\n";
1813 return_value
= NULL
;
1817 /* Does an interactive user really want to do this? Include
1818 information, such as how well GDB can handle the return value, in
1819 the query message. */
1823 if (thisfun
== NULL
)
1824 confirmed
= query (_("%sMake selected stack frame return now? "),
1827 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1828 SYMBOL_PRINT_NAME (thisfun
));
1830 error (_("Not confirmed"));
1833 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1834 frame in turn, should this code just go straight to the relevant
1835 frame and pop that? */
1837 /* First discard all frames inner-to the selected frame (making the
1838 selected frame current). */
1840 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1841 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1843 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1844 /* Caught in the safety net, oops! We've gone way past the
1846 error (_("Problem while popping stack frames (corrupt stack?)"));
1847 frame_pop (get_current_frame ());
1851 /* Second discard the selected frame (which is now also the current
1853 frame_pop (get_current_frame ());
1855 /* Store RETURN_VALUE in the just-returned register set. */
1856 if (return_value
!= NULL
)
1858 struct type
*return_type
= value_type (return_value
);
1859 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1861 == RETURN_VALUE_REGISTER_CONVENTION
);
1862 gdbarch_return_value (current_gdbarch
, return_type
,
1863 get_current_regcache (), NULL
/*read*/,
1864 value_contents (return_value
) /*write*/);
1867 /* If we are at the end of a call dummy now, pop the dummy frame
1869 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1870 frame_pop (get_current_frame ());
1872 /* If interactive, print the frame that is now current. */
1874 frame_command ("0", 1);
1876 select_frame_command ("0", 0);
1879 /* Sets the scope to input function name, provided that the function
1880 is within the current stack frame */
1882 struct function_bounds
1884 CORE_ADDR low
, high
;
1888 func_command (char *arg
, int from_tty
)
1890 struct frame_info
*frame
;
1892 struct symtabs_and_lines sals
;
1895 struct function_bounds
*func_bounds
= NULL
;
1900 frame
= parse_frame_specification ("0");
1901 sals
= decode_line_spec (arg
, 1);
1902 func_bounds
= (struct function_bounds
*) xmalloc (
1903 sizeof (struct function_bounds
) * sals
.nelts
);
1904 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1906 if (sals
.sals
[i
].pc
== 0
1907 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1908 &func_bounds
[i
].low
,
1909 &func_bounds
[i
].high
) == 0)
1911 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1917 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1918 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1919 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1923 frame
= find_relative_frame (frame
, &level
);
1926 while (!found
&& level
== 0);
1929 xfree (func_bounds
);
1932 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1933 else if (frame
!= get_selected_frame (NULL
))
1934 select_and_print_frame (frame
);
1937 /* Gets the language of the current frame. */
1940 get_frame_language (void)
1942 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1946 /* We determine the current frame language by looking up its
1947 associated symtab. To retrieve this symtab, we use the frame
1948 PC. However we cannot use the frame PC as is, because it
1949 usually points to the instruction following the "call", which
1950 is sometimes the first instruction of another function. So
1951 we rely on get_frame_address_in_block(), it provides us with
1952 a PC that is guaranteed to be inside the frame's code
1954 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1955 struct symtab
*s
= find_pc_symtab (pc
);
1961 return language_unknown
;
1965 /* Provide a prototype to silence -Wmissing-prototypes. */
1966 void _initialize_stack (void);
1969 _initialize_stack (void)
1972 backtrace_limit
= 30;
1975 add_com ("return", class_stack
, return_command
, _("\
1976 Make selected stack frame return to its caller.\n\
1977 Control remains in the debugger, but when you continue\n\
1978 execution will resume in the frame above the one now selected.\n\
1979 If an argument is given, it is an expression for the value to return."));
1981 add_com ("up", class_stack
, up_command
, _("\
1982 Select and print stack frame that called this one.\n\
1983 An argument says how many frames up to go."));
1984 add_com ("up-silently", class_support
, up_silently_command
, _("\
1985 Same as the `up' command, but does not print anything.\n\
1986 This is useful in command scripts."));
1988 add_com ("down", class_stack
, down_command
, _("\
1989 Select and print stack frame called by this one.\n\
1990 An argument says how many frames down to go."));
1991 add_com_alias ("do", "down", class_stack
, 1);
1992 add_com_alias ("dow", "down", class_stack
, 1);
1993 add_com ("down-silently", class_support
, down_silently_command
, _("\
1994 Same as the `down' command, but does not print anything.\n\
1995 This is useful in command scripts."));
1997 add_com ("frame", class_stack
, frame_command
, _("\
1998 Select and print a stack frame.\n\
1999 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2000 An argument specifies the frame to select.\n\
2001 It can be a stack frame number or the address of the frame.\n\
2002 With argument, nothing is printed if input is coming from\n\
2003 a command file or a user-defined command."));
2005 add_com_alias ("f", "frame", class_stack
, 1);
2009 add_com ("L", class_stack
, current_frame_command
,
2010 _("Print the current stack frame.\n"));
2011 add_com_alias ("V", "frame", class_stack
, 1);
2013 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2014 Select a stack frame without printing anything.\n\
2015 An argument specifies the frame to select.\n\
2016 It can be a stack frame number or the address of the frame.\n"));
2018 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2019 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2020 With a negative argument, print outermost -COUNT frames.\n\
2021 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2022 add_com_alias ("bt", "backtrace", class_stack
, 0);
2025 add_com_alias ("t", "backtrace", class_stack
, 0);
2026 add_com ("T", class_stack
, backtrace_full_command
, _("\
2027 Print backtrace of all stack frames, or innermost COUNT frames \n\
2028 and the values of the local variables.\n\
2029 With a negative argument, print outermost -COUNT frames.\n\
2030 Usage: T <count>\n"));
2033 add_com_alias ("where", "backtrace", class_alias
, 0);
2034 add_info ("stack", backtrace_command
,
2035 _("Backtrace of the stack, or innermost COUNT frames."));
2036 add_info_alias ("s", "stack", 1);
2037 add_info ("frame", frame_info
,
2038 _("All about selected stack frame, or frame at ADDR."));
2039 add_info_alias ("f", "frame", 1);
2040 add_info ("locals", locals_info
,
2041 _("Local variables of current stack frame."));
2042 add_info ("args", args_info
,
2043 _("Argument variables of current stack frame."));
2045 add_com ("l", class_info
, args_plus_locals_info
,
2046 _("Argument and local variables of current stack frame."));
2049 add_com ("func", class_stack
, func_command
, _("\
2050 Select the stack frame that contains <func>.\n\
2051 Usage: func <name>\n"));
2053 add_info ("catch", catch_info
,
2054 _("Exceptions that can be caught in the current stack frame."));
2057 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2058 "Specify maximum number of frames for \"backtrace\" to print by default."),
2060 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2061 The maximum number of frames for \"backtrace\" to print by default."));