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
);
590 struct minimal_symbol
*msymbol
=
591 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
595 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
596 funlang
= SYMBOL_LANGUAGE (msymbol
);
600 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
601 get_frame_pc (frame
));
603 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
607 ui_out_text (uiout
, "#");
608 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
609 frame_relative_level (frame
));
612 if (get_frame_pc (frame
) != sal
.pc
|| !sal
.symtab
613 || print_what
== LOC_AND_ADDRESS
)
615 annotate_frame_address ();
616 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
617 annotate_frame_address_end ();
618 ui_out_text (uiout
, " in ");
620 annotate_frame_function_name ();
621 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
623 ui_out_field_stream (uiout
, "func", stb
);
624 ui_out_wrap_hint (uiout
, " ");
625 annotate_frame_args ();
627 ui_out_text (uiout
, " (");
630 struct print_args_args args
;
631 struct cleanup
*args_list_chain
;
634 args
.stream
= gdb_stdout
;
635 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
636 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
637 /* FIXME: ARGS must be a list. If one argument is a string it
638 will have " that will not be properly escaped. */
639 /* Invoke ui_out_tuple_end. */
640 do_cleanups (args_list_chain
);
643 ui_out_text (uiout
, ")");
644 if (sal
.symtab
&& sal
.symtab
->filename
)
646 annotate_frame_source_begin ();
647 ui_out_wrap_hint (uiout
, " ");
648 ui_out_text (uiout
, " at ");
649 annotate_frame_source_file ();
650 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
651 if (ui_out_is_mi_like_p (uiout
))
653 const char *fullname
= symtab_to_fullname (sal
.symtab
);
654 if (fullname
!= NULL
)
655 ui_out_field_string (uiout
, "fullname", fullname
);
657 annotate_frame_source_file_end ();
658 ui_out_text (uiout
, ":");
659 annotate_frame_source_line ();
660 ui_out_field_int (uiout
, "line", sal
.line
);
661 annotate_frame_source_end ();
664 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
667 char *lib
= PC_SOLIB (get_frame_pc (frame
));
669 char *lib
= solib_address (get_frame_pc (frame
));
673 annotate_frame_where ();
674 ui_out_wrap_hint (uiout
, " ");
675 ui_out_text (uiout
, " from ");
676 ui_out_field_string (uiout
, "from", lib
);
680 /* do_cleanups will call ui_out_tuple_end() for us. */
681 do_cleanups (list_chain
);
682 ui_out_text (uiout
, "\n");
683 do_cleanups (old_chain
);
686 /* Show the frame info. If this is the tui, it will be shown in the
687 source display otherwise, nothing is done. */
690 show_stack_frame (struct frame_info
*frame
)
695 /* Read a frame specification in whatever the appropriate format is
696 from FRAME_EXP. Call error(), printing MESSAGE, if the
697 specification is in any way invalid (so this function never returns
698 NULL). When SEPECTED_P is non-NULL set its target to indicate that
699 the default selected frame was used. */
701 static struct frame_info
*
702 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
703 int *selected_frame_p
)
706 struct value
*args
[4];
707 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
709 if (frame_exp
== NULL
)
714 struct cleanup
*tmp_cleanup
;
720 struct cleanup
*cleanup
;
723 /* Skip leading white space, bail of EOL. */
724 while (isspace (*frame_exp
))
729 /* Parse the argument, extract it, save it. */
733 addr_string
= savestring (frame_exp
, p
- frame_exp
);
735 cleanup
= make_cleanup (xfree
, addr_string
);
737 /* NOTE: Parse and evaluate expression, but do not use
738 functions such as parse_and_eval_long or
739 parse_and_eval_address to also extract the value.
740 Instead value_as_long and value_as_address are used.
741 This avoids problems with expressions that contain
743 if (numargs
>= ARRAY_SIZE (args
))
744 error (_("Too many args in frame specification"));
745 args
[numargs
++] = parse_and_eval (addr_string
);
747 do_cleanups (cleanup
);
751 /* If no args, default to the selected frame. */
754 if (selected_frame_p
!= NULL
)
755 (*selected_frame_p
) = 1;
756 return get_selected_frame (message
);
759 /* None of the remaining use the selected frame. */
760 if (selected_frame_p
!= NULL
)
761 (*selected_frame_p
) = 0;
763 /* Assume the single arg[0] is an integer, and try using that to
764 select a frame relative to current. */
767 struct frame_info
*fid
;
768 int level
= value_as_long (args
[0]);
769 fid
= find_relative_frame (get_current_frame (), &level
);
771 /* find_relative_frame was successful */
775 /* Convert each value into a corresponding address. */
778 for (i
= 0; i
< numargs
; i
++)
779 addrs
[i
] = value_as_address (args
[0]);
782 /* Assume that the single arg[0] is an address, use that to identify
783 a frame with a matching ID. Should this also accept stack/pc or
787 struct frame_id id
= frame_id_build_wild (addrs
[0]);
788 struct frame_info
*fid
;
790 /* If (s)he specifies the frame with an address, he deserves
791 what (s)he gets. Still, give the highest one that matches.
792 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
794 for (fid
= get_current_frame ();
796 fid
= get_prev_frame (fid
))
798 if (frame_id_eq (id
, get_frame_id (fid
)))
800 while (frame_id_eq (id
, frame_unwind_id (fid
)))
801 fid
= get_prev_frame (fid
);
807 /* We couldn't identify the frame as an existing frame, but
808 perhaps we can create one with a single argument. */
810 return create_new_frame (addrs
[0], 0);
811 else if (numargs
== 2)
812 return create_new_frame (addrs
[0], addrs
[1]);
814 error (_("Too many args in frame specification"));
817 static struct frame_info
*
818 parse_frame_specification (char *frame_exp
)
820 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
823 /* Print verbosely the selected frame or the frame at address
824 ADDR_EXP. Absolutely all information in the frame is printed. */
827 frame_info (char *addr_exp
, int from_tty
)
829 struct frame_info
*fi
;
830 struct symtab_and_line sal
;
833 struct frame_info
*calling_frame_info
;
834 int i
, count
, numregs
;
836 enum language funlang
= language_unknown
;
837 const char *pc_regname
;
838 int selected_frame_p
;
840 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
842 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
843 is not a good name. */
844 if (gdbarch_pc_regnum (current_gdbarch
) >= 0)
845 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
846 easily not match that of the internal value returned by
848 pc_regname
= gdbarch_register_name (current_gdbarch
,
849 gdbarch_pc_regnum (current_gdbarch
));
851 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
852 architectures will often have a hardware register called "pc",
853 and that register's value, again, can easily not match
857 find_frame_sal (fi
, &sal
);
858 func
= get_frame_function (fi
);
859 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
861 s
= find_pc_symtab (get_frame_pc (fi
));
864 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
865 display the demangled name that we already have stored in the
866 symbol table, but we stored a version with DMGL_PARAMS turned
867 on, and here we don't want to display parameters. So call the
868 demangler again, with DMGL_ANSI only.
870 Yes, printf_symbol_filtered() will again try to demangle the
871 name on the fly, but the issue is that if cplus_demangle()
872 fails here, it will fail there too. So we want to catch the
873 failure (where DEMANGLED is NULL below) here, while we still
874 have our hands on the function symbol.) */
875 funname
= DEPRECATED_SYMBOL_NAME (func
);
876 funlang
= SYMBOL_LANGUAGE (func
);
877 if (funlang
== language_cplus
)
879 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
880 /* If the demangler fails, try the demangled name from the
881 symbol table. That'll have parameters, but that's
882 preferable to displaying a mangled name. */
883 if (demangled
== NULL
)
884 funname
= SYMBOL_PRINT_NAME (func
);
889 struct minimal_symbol
*msymbol
;
891 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
894 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
895 funlang
= SYMBOL_LANGUAGE (msymbol
);
898 calling_frame_info
= get_prev_frame (fi
);
900 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
902 printf_filtered (_("Stack level %d, frame at "),
903 frame_relative_level (fi
));
907 printf_filtered (_("Stack frame at "));
909 deprecated_print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
910 printf_filtered (":\n");
911 printf_filtered (" %s = ", pc_regname
);
912 deprecated_print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
917 printf_filtered (" in ");
918 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
919 DMGL_ANSI
| DMGL_PARAMS
);
923 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
924 puts_filtered ("; ");
926 printf_filtered ("saved %s ", pc_regname
);
927 deprecated_print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
928 printf_filtered ("\n");
930 if (calling_frame_info
== NULL
)
932 enum unwind_stop_reason reason
;
934 reason
= get_frame_unwind_stop_reason (fi
);
935 if (reason
!= UNWIND_NO_REASON
)
936 printf_filtered (_(" Outermost frame: %s\n"),
937 frame_stop_reason_string (reason
));
940 if (calling_frame_info
)
942 printf_filtered (" called by frame at ");
943 deprecated_print_address_numeric (get_frame_base (calling_frame_info
),
946 if (get_next_frame (fi
) && calling_frame_info
)
949 if (get_next_frame (fi
))
951 printf_filtered (" caller of frame at ");
952 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
955 if (get_next_frame (fi
) || calling_frame_info
)
956 puts_filtered ("\n");
959 printf_filtered (" source language %s.\n",
960 language_str (s
->language
));
963 /* Address of the argument list for this frame, or 0. */
964 CORE_ADDR arg_list
= get_frame_args_address (fi
);
965 /* Number of args for this frame, or -1 if unknown. */
969 printf_filtered (" Arglist at unknown address.\n");
972 printf_filtered (" Arglist at ");
973 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
974 printf_filtered (",");
976 if (!gdbarch_frame_num_args_p (current_gdbarch
))
979 puts_filtered (" args: ");
983 numargs
= gdbarch_frame_num_args (current_gdbarch
, fi
);
984 gdb_assert (numargs
>= 0);
986 puts_filtered (" no args.");
987 else if (numargs
== 1)
988 puts_filtered (" 1 arg: ");
990 printf_filtered (" %d args: ", numargs
);
992 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
993 puts_filtered ("\n");
997 /* Address of the local variables for this frame, or 0. */
998 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1001 printf_filtered (" Locals at unknown address,");
1004 printf_filtered (" Locals at ");
1005 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1006 printf_filtered (",");
1010 /* Print as much information as possible on the location of all the
1013 enum lval_type lval
;
1021 /* The sp is special; what's displayed isn't the save address, but
1022 the value of the previous frame's sp. This is a legacy thing,
1023 at one stage the frame cached the previous frame's SP instead
1024 of its address, hence it was easiest to just display the cached
1026 if (gdbarch_sp_regnum (current_gdbarch
) >= 0)
1028 /* Find out the location of the saved stack pointer with out
1029 actually evaluating it. */
1030 frame_register_unwind (fi
, gdbarch_sp_regnum (current_gdbarch
),
1031 &optimized
, &lval
, &addr
,
1033 if (!optimized
&& lval
== not_lval
)
1035 gdb_byte value
[MAX_REGISTER_SIZE
];
1037 frame_register_unwind (fi
, gdbarch_sp_regnum (current_gdbarch
),
1038 &optimized
, &lval
, &addr
,
1040 /* NOTE: cagney/2003-05-22: This is assuming that the
1041 stack pointer was packed as an unsigned integer. That
1042 may or may not be valid. */
1043 sp
= extract_unsigned_integer (value
,
1044 register_size (current_gdbarch
,
1045 gdbarch_sp_regnum (current_gdbarch
)));
1046 printf_filtered (" Previous frame's sp is ");
1047 deprecated_print_address_numeric (sp
, 1, gdb_stdout
);
1048 printf_filtered ("\n");
1051 else if (!optimized
&& lval
== lval_memory
)
1053 printf_filtered (" Previous frame's sp at ");
1054 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1055 printf_filtered ("\n");
1058 else if (!optimized
&& lval
== lval_register
)
1060 printf_filtered (" Previous frame's sp in %s\n",
1061 gdbarch_register_name (current_gdbarch
, realnum
));
1064 /* else keep quiet. */
1068 numregs
= gdbarch_num_regs (current_gdbarch
)
1069 + gdbarch_num_pseudo_regs (current_gdbarch
);
1070 for (i
= 0; i
< numregs
; i
++)
1071 if (i
!= gdbarch_sp_regnum (current_gdbarch
)
1072 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1074 /* Find out the location of the saved register without
1075 fetching the corresponding value. */
1076 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1078 /* For moment, only display registers that were saved on the
1080 if (!optimized
&& lval
== lval_memory
)
1083 puts_filtered (" Saved registers:\n ");
1085 puts_filtered (",");
1087 printf_filtered (" %s at ",
1088 gdbarch_register_name (current_gdbarch
, i
));
1089 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1093 if (count
|| need_nl
)
1094 puts_filtered ("\n");
1098 /* Print briefly all stack frames or just the innermost COUNT_EXP
1102 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1104 struct frame_info
*fi
;
1107 struct frame_info
*trailing
;
1110 if (!target_has_stack
)
1111 error (_("No stack."));
1113 /* The following code must do two things. First, it must set the
1114 variable TRAILING to the frame from which we should start
1115 printing. Second, it must set the variable count to the number
1116 of frames which we should print, or -1 if all of them. */
1117 trailing
= get_current_frame ();
1119 /* The target can be in a state where there is no valid frames
1120 (e.g., just connected). */
1121 if (trailing
== NULL
)
1122 error (_("No stack."));
1127 count
= parse_and_eval_long (count_exp
);
1130 struct frame_info
*current
;
1135 while (current
&& count
--)
1138 current
= get_prev_frame (current
);
1141 /* Will stop when CURRENT reaches the top of the stack.
1142 TRAILING will be COUNT below it. */
1146 trailing
= get_prev_frame (trailing
);
1147 current
= get_prev_frame (current
);
1159 struct partial_symtab
*ps
;
1161 /* Read in symbols for all of the frames. Need to do this in a
1162 separate pass so that "Reading in symbols for xxx" messages
1163 don't screw up the appearance of the backtrace. Also if
1164 people have strong opinions against reading symbols for
1165 backtrace this may have to be an option. */
1167 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1170 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1172 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1176 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1180 /* Don't use print_stack_frame; if an error() occurs it probably
1181 means further attempts to backtrace would fail (on the other
1182 hand, perhaps the code does or could be fixed to make sure
1183 the frame->prev field gets set to NULL in that case). */
1184 print_frame_info (fi
, 1, LOCATION
, 1);
1186 print_frame_local_vars (fi
, 1, gdb_stdout
);
1188 /* Save the last frame to check for error conditions. */
1192 /* If we've stopped before the end, mention that. */
1194 printf_filtered (_("(More stack frames follow...)\n"));
1196 /* If we've run out of frames, and the reason appears to be an error
1197 condition, print it. */
1198 if (fi
== NULL
&& trailing
!= NULL
)
1200 enum unwind_stop_reason reason
;
1202 reason
= get_frame_unwind_stop_reason (trailing
);
1203 if (reason
> UNWIND_FIRST_ERROR
)
1204 printf_filtered (_("Backtrace stopped: %s\n"),
1205 frame_stop_reason_string (reason
));
1209 struct backtrace_command_args
1216 /* Stub for catch_errors. */
1219 backtrace_command_stub (void *data
)
1221 struct backtrace_command_args
*args
= data
;
1222 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1227 backtrace_command (char *arg
, int from_tty
)
1229 struct cleanup
*old_chain
= NULL
;
1230 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1231 struct backtrace_command_args btargs
;
1238 argv
= buildargv (arg
);
1239 old_chain
= make_cleanup_freeargv (argv
);
1241 for (i
= 0; argv
[i
]; i
++)
1245 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1246 argv
[i
][j
] = tolower (argv
[i
][j
]);
1248 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1249 fulltrace_arg
= argc
;
1252 arglen
+= strlen (argv
[i
]);
1257 if (fulltrace_arg
>= 0)
1261 arg
= xmalloc (arglen
+ 1);
1262 memset (arg
, 0, arglen
+ 1);
1263 for (i
= 0; i
< (argc
+ 1); i
++)
1265 if (i
!= fulltrace_arg
)
1267 strcat (arg
, argv
[i
]);
1277 btargs
.count_exp
= arg
;
1278 btargs
.show_locals
= (fulltrace_arg
>= 0);
1279 btargs
.from_tty
= from_tty
;
1280 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1282 if (fulltrace_arg
>= 0 && arglen
> 0)
1286 do_cleanups (old_chain
);
1290 backtrace_full_command (char *arg
, int from_tty
)
1292 struct backtrace_command_args btargs
;
1293 btargs
.count_exp
= arg
;
1294 btargs
.show_locals
= 1;
1295 btargs
.from_tty
= from_tty
;
1296 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1300 /* Print the local variables of a block B active in FRAME on STREAM.
1301 Return 1 if any variables were printed; 0 otherwise. */
1304 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1305 int num_tabs
, struct ui_file
*stream
)
1307 struct dict_iterator iter
;
1309 int values_printed
= 0;
1312 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1314 switch (SYMBOL_CLASS (sym
))
1322 for (j
= 0; j
< num_tabs
; j
++)
1323 fputs_filtered ("\t", stream
);
1324 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1325 fputs_filtered (" = ", stream
);
1326 print_variable_value (sym
, frame
, stream
);
1327 fprintf_filtered (stream
, "\n");
1331 /* Ignore symbols which are not locals. */
1336 return values_printed
;
1339 /* Same, but print labels. */
1342 print_block_frame_labels (struct block
*b
, int *have_default
,
1343 struct ui_file
*stream
)
1345 struct dict_iterator iter
;
1347 int values_printed
= 0;
1349 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1351 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1357 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1359 struct symtab_and_line sal
;
1360 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1362 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1365 fprintf_filtered (stream
, " ");
1366 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1368 fprintf_filtered (stream
, " in file %s, line %d\n",
1369 sal
.symtab
->filename
, sal
.line
);
1373 return values_printed
;
1376 /* Print on STREAM all the local variables in frame FRAME, including
1377 all the blocks active in that frame at its current PC.
1379 Returns 1 if the job was done, or 0 if nothing was printed because
1380 we have no info on the function running in FRAME. */
1383 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1384 struct ui_file
*stream
)
1386 struct block
*block
= get_frame_block (frame
, 0);
1387 int values_printed
= 0;
1391 fprintf_filtered (stream
, "No symbol table info available.\n");
1397 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1399 /* After handling the function's top-level block, stop. Don't
1400 continue to its superblock, the block of per-file symbols. */
1401 if (BLOCK_FUNCTION (block
))
1403 block
= BLOCK_SUPERBLOCK (block
);
1406 if (!values_printed
)
1407 fprintf_filtered (stream
, _("No locals.\n"));
1410 /* Same, but print labels. */
1413 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1414 struct ui_file
*stream
)
1416 struct blockvector
*bl
;
1417 struct block
*block
= get_frame_block (frame
, 0);
1418 int values_printed
= 0;
1419 int index
, have_default
= 0;
1420 char *blocks_printed
;
1421 CORE_ADDR pc
= get_frame_pc (frame
);
1425 fprintf_filtered (stream
, "No symbol table info available.\n");
1429 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1430 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1431 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1435 CORE_ADDR end
= BLOCK_END (block
) - 4;
1438 if (bl
!= blockvector_for_pc (end
, &index
))
1439 error (_("blockvector blotch"));
1440 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1441 error (_("blockvector botch"));
1442 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1445 /* Don't print out blocks that have gone by. */
1446 while (index
< last_index
1447 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1450 while (index
< last_index
1451 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1453 if (blocks_printed
[index
] == 0)
1455 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1456 &have_default
, stream
))
1458 blocks_printed
[index
] = 1;
1464 if (values_printed
&& this_level_only
)
1467 /* After handling the function's top-level block, stop. Don't
1468 continue to its superblock, the block of per-file symbols. */
1469 if (BLOCK_FUNCTION (block
))
1471 block
= BLOCK_SUPERBLOCK (block
);
1474 if (!values_printed
&& !this_level_only
)
1475 fprintf_filtered (stream
, _("No catches.\n"));
1479 locals_info (char *args
, int from_tty
)
1481 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1486 catch_info (char *ignore
, int from_tty
)
1488 struct symtab_and_line
*sal
;
1490 /* Check for target support for exception handling */
1491 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1494 /* Currently not handling this. Ideally, here we should
1495 interact with the C++ runtime system to find the list of
1496 active handlers, etc. */
1497 fprintf_filtered (gdb_stdout
, _("\
1498 Info catch not supported with this target/compiler combination.\n"));
1502 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1503 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1509 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1511 struct symbol
*func
= get_frame_function (frame
);
1513 struct dict_iterator iter
;
1514 struct symbol
*sym
, *sym2
;
1515 int values_printed
= 0;
1519 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1523 b
= SYMBOL_BLOCK_VALUE (func
);
1524 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1526 switch (SYMBOL_CLASS (sym
))
1532 case LOC_REGPARM_ADDR
:
1533 case LOC_BASEREG_ARG
:
1534 case LOC_COMPUTED_ARG
:
1536 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1537 fputs_filtered (" = ", stream
);
1539 /* We have to look up the symbol because arguments can have
1540 two entries (one a parameter, one a local) and the one we
1541 want is the local, which lookup_symbol will find for us.
1542 This includes gcc1 (not gcc2) on the sparc when passing a
1543 small structure and gcc2 when the argument type is float
1544 and it is passed as a double and converted to float by
1545 the prologue (in the latter case the type of the LOC_ARG
1546 symbol is double and the type of the LOC_LOCAL symbol is
1547 float). There are also LOC_ARG/LOC_REGISTER pairs which
1548 are not combined in symbol-reading. */
1550 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1551 b
, VAR_DOMAIN
, NULL
, NULL
);
1552 print_variable_value (sym2
, frame
, stream
);
1553 fprintf_filtered (stream
, "\n");
1557 /* Don't worry about things which aren't arguments. */
1562 if (!values_printed
)
1563 fprintf_filtered (stream
, _("No arguments.\n"));
1567 args_info (char *ignore
, int from_tty
)
1569 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1575 args_plus_locals_info (char *ignore
, int from_tty
)
1577 args_info (ignore
, from_tty
);
1578 locals_info (ignore
, from_tty
);
1582 /* Select frame FRAME. Also print the stack frame and show the source
1583 if this is the tui version. */
1585 select_and_print_frame (struct frame_info
*frame
)
1587 select_frame (frame
);
1589 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1592 /* Return the symbol-block in which the selected frame is executing.
1593 Can return zero under various legitimate circumstances.
1595 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1596 code address within the block returned. We use this to decide
1597 which macros are in scope. */
1600 get_selected_block (CORE_ADDR
*addr_in_block
)
1602 if (!target_has_stack
)
1605 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1608 /* Find a frame a certain number of levels away from FRAME.
1609 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1610 Positive means go to earlier frames (up); negative, the reverse.
1611 The int that contains the number of levels is counted toward
1612 zero as the frames for those levels are found.
1613 If the top or bottom frame is reached, that frame is returned,
1614 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1615 how much farther the original request asked to go. */
1618 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1620 /* Going up is simple: just call get_prev_frame enough times or
1621 until the initial frame is reached. */
1622 while (*level_offset_ptr
> 0)
1624 struct frame_info
*prev
= get_prev_frame (frame
);
1627 (*level_offset_ptr
)--;
1631 /* Going down is just as simple. */
1632 while (*level_offset_ptr
< 0)
1634 struct frame_info
*next
= get_next_frame (frame
);
1637 (*level_offset_ptr
)++;
1644 /* The "select_frame" command. With no argument this is a NOP.
1645 Select the frame at level LEVEL_EXP if it is a valid level.
1646 Otherwise, treat LEVEL_EXP as an address expression and select it.
1648 See parse_frame_specification for more info on proper frame
1652 select_frame_command (char *level_exp
, int from_tty
)
1654 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1657 /* The "frame" command. With no argument, print the selected frame
1658 briefly. With an argument, behave like select_frame and then print
1659 the selected frame. */
1662 frame_command (char *level_exp
, int from_tty
)
1664 select_frame_command (level_exp
, from_tty
);
1665 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1668 /* The XDB Compatibility command to print the current frame. */
1671 current_frame_command (char *level_exp
, int from_tty
)
1673 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1676 /* Select the frame up one or COUNT_EXP stack levels from the
1677 previously selected frame, and print it briefly. */
1680 up_silently_base (char *count_exp
)
1682 struct frame_info
*frame
;
1686 count
= parse_and_eval_long (count_exp
);
1688 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1689 if (count
!= 0 && count_exp
== NULL
)
1690 error (_("Initial frame selected; you cannot go up."));
1691 select_frame (frame
);
1695 up_silently_command (char *count_exp
, int from_tty
)
1697 up_silently_base (count_exp
);
1701 up_command (char *count_exp
, int from_tty
)
1703 up_silently_base (count_exp
);
1704 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1707 /* Select the frame down one or COUNT_EXP stack levels from the previously
1708 selected frame, and print it briefly. */
1711 down_silently_base (char *count_exp
)
1713 struct frame_info
*frame
;
1716 count
= -parse_and_eval_long (count_exp
);
1718 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1719 if (count
!= 0 && count_exp
== NULL
)
1721 /* We only do this if COUNT_EXP is not specified. That way
1722 "down" means to really go down (and let me know if that is
1723 impossible), but "down 9999" can be used to mean go all the
1724 way down without getting an error. */
1726 error (_("Bottom (innermost) frame selected; you cannot go down."));
1729 select_frame (frame
);
1733 down_silently_command (char *count_exp
, int from_tty
)
1735 down_silently_base (count_exp
);
1739 down_command (char *count_exp
, int from_tty
)
1741 down_silently_base (count_exp
);
1742 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1747 return_command (char *retval_exp
, int from_tty
)
1749 struct symbol
*thisfun
;
1750 struct value
*return_value
= NULL
;
1751 const char *query_prefix
= "";
1753 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1755 /* Compute the return value. If the computation triggers an error,
1756 let it bail. If the return type can't be handled, set
1757 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1761 struct type
*return_type
= NULL
;
1763 /* Compute the return value. Should the computation fail, this
1764 call throws an error. */
1765 return_value
= parse_and_eval (retval_exp
);
1767 /* Cast return value to the return type of the function. Should
1768 the cast fail, this call throws an error. */
1769 if (thisfun
!= NULL
)
1770 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1771 if (return_type
== NULL
)
1772 return_type
= builtin_type_int
;
1773 CHECK_TYPEDEF (return_type
);
1774 return_value
= value_cast (return_type
, return_value
);
1776 /* Make sure the value is fully evaluated. It may live in the
1777 stack frame we're about to pop. */
1778 if (value_lazy (return_value
))
1779 value_fetch_lazy (return_value
);
1781 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1782 /* If the return-type is "void", don't try to find the
1783 return-value's location. However, do still evaluate the
1784 return expression so that, even when the expression result
1785 is discarded, side effects such as "return i++" still
1787 return_value
= NULL
;
1788 /* FIXME: cagney/2004-01-17: If the architecture implements both
1789 return_value and extract_returned_value_address, should allow
1790 "return" to work - don't set return_value to NULL. */
1791 else if (!gdbarch_return_value_p (current_gdbarch
)
1792 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1793 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1795 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1796 code. Old architectures don't expect gdbarch_store_return_value
1797 to be called with with a small struct that needs to be
1798 stored in registers. Don't start doing it now. */
1800 A structure or union return type is not supported by this architecture.\n\
1801 If you continue, the return value that you specified will be ignored.\n";
1802 return_value
= NULL
;
1804 else if (using_struct_return (return_type
, 0))
1807 The location at which to store the function's return value is unknown.\n\
1808 If you continue, the return value that you specified will be ignored.\n";
1809 return_value
= NULL
;
1813 /* Does an interactive user really want to do this? Include
1814 information, such as how well GDB can handle the return value, in
1815 the query message. */
1819 if (thisfun
== NULL
)
1820 confirmed
= query (_("%sMake selected stack frame return now? "),
1823 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1824 SYMBOL_PRINT_NAME (thisfun
));
1826 error (_("Not confirmed"));
1829 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1830 frame in turn, should this code just go straight to the relevant
1831 frame and pop that? */
1833 /* First discard all frames inner-to the selected frame (making the
1834 selected frame current). */
1836 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1837 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1839 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1840 /* Caught in the safety net, oops! We've gone way past the
1842 error (_("Problem while popping stack frames (corrupt stack?)"));
1843 frame_pop (get_current_frame ());
1847 /* Second discard the selected frame (which is now also the current
1849 frame_pop (get_current_frame ());
1851 /* Store RETURN_VALUE in the just-returned register set. */
1852 if (return_value
!= NULL
)
1854 struct type
*return_type
= value_type (return_value
);
1855 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1857 == RETURN_VALUE_REGISTER_CONVENTION
);
1858 gdbarch_return_value (current_gdbarch
, return_type
,
1859 get_current_regcache (), NULL
/*read*/,
1860 value_contents (return_value
) /*write*/);
1863 /* If we are at the end of a call dummy now, pop the dummy frame
1865 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1866 frame_pop (get_current_frame ());
1868 /* If interactive, print the frame that is now current. */
1870 frame_command ("0", 1);
1872 select_frame_command ("0", 0);
1875 /* Sets the scope to input function name, provided that the function
1876 is within the current stack frame */
1878 struct function_bounds
1880 CORE_ADDR low
, high
;
1884 func_command (char *arg
, int from_tty
)
1886 struct frame_info
*frame
;
1888 struct symtabs_and_lines sals
;
1891 struct function_bounds
*func_bounds
= NULL
;
1896 frame
= parse_frame_specification ("0");
1897 sals
= decode_line_spec (arg
, 1);
1898 func_bounds
= (struct function_bounds
*) xmalloc (
1899 sizeof (struct function_bounds
) * sals
.nelts
);
1900 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1902 if (sals
.sals
[i
].pc
== 0
1903 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1904 &func_bounds
[i
].low
,
1905 &func_bounds
[i
].high
) == 0)
1907 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1913 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1914 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1915 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1919 frame
= find_relative_frame (frame
, &level
);
1922 while (!found
&& level
== 0);
1925 xfree (func_bounds
);
1928 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1929 else if (frame
!= get_selected_frame (NULL
))
1930 select_and_print_frame (frame
);
1933 /* Gets the language of the current frame. */
1936 get_frame_language (void)
1938 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1942 /* We determine the current frame language by looking up its
1943 associated symtab. To retrieve this symtab, we use the frame
1944 PC. However we cannot use the frame PC as is, because it
1945 usually points to the instruction following the "call", which
1946 is sometimes the first instruction of another function. So
1947 we rely on get_frame_address_in_block(), it provides us with
1948 a PC that is guaranteed to be inside the frame's code
1950 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1951 struct symtab
*s
= find_pc_symtab (pc
);
1957 return language_unknown
;
1961 /* Provide a prototype to silence -Wmissing-prototypes. */
1962 void _initialize_stack (void);
1965 _initialize_stack (void)
1968 backtrace_limit
= 30;
1971 add_com ("return", class_stack
, return_command
, _("\
1972 Make selected stack frame return to its caller.\n\
1973 Control remains in the debugger, but when you continue\n\
1974 execution will resume in the frame above the one now selected.\n\
1975 If an argument is given, it is an expression for the value to return."));
1977 add_com ("up", class_stack
, up_command
, _("\
1978 Select and print stack frame that called this one.\n\
1979 An argument says how many frames up to go."));
1980 add_com ("up-silently", class_support
, up_silently_command
, _("\
1981 Same as the `up' command, but does not print anything.\n\
1982 This is useful in command scripts."));
1984 add_com ("down", class_stack
, down_command
, _("\
1985 Select and print stack frame called by this one.\n\
1986 An argument says how many frames down to go."));
1987 add_com_alias ("do", "down", class_stack
, 1);
1988 add_com_alias ("dow", "down", class_stack
, 1);
1989 add_com ("down-silently", class_support
, down_silently_command
, _("\
1990 Same as the `down' command, but does not print anything.\n\
1991 This is useful in command scripts."));
1993 add_com ("frame", class_stack
, frame_command
, _("\
1994 Select and print a stack frame.\n\
1995 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1996 An argument specifies the frame to select.\n\
1997 It can be a stack frame number or the address of the frame.\n\
1998 With argument, nothing is printed if input is coming from\n\
1999 a command file or a user-defined command."));
2001 add_com_alias ("f", "frame", class_stack
, 1);
2005 add_com ("L", class_stack
, current_frame_command
,
2006 _("Print the current stack frame.\n"));
2007 add_com_alias ("V", "frame", class_stack
, 1);
2009 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2010 Select a stack frame without printing anything.\n\
2011 An argument specifies the frame to select.\n\
2012 It can be a stack frame number or the address of the frame.\n"));
2014 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2015 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2016 With a negative argument, print outermost -COUNT frames.\n\
2017 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2018 add_com_alias ("bt", "backtrace", class_stack
, 0);
2021 add_com_alias ("t", "backtrace", class_stack
, 0);
2022 add_com ("T", class_stack
, backtrace_full_command
, _("\
2023 Print backtrace of all stack frames, or innermost COUNT frames \n\
2024 and the values of the local variables.\n\
2025 With a negative argument, print outermost -COUNT frames.\n\
2026 Usage: T <count>\n"));
2029 add_com_alias ("where", "backtrace", class_alias
, 0);
2030 add_info ("stack", backtrace_command
,
2031 _("Backtrace of the stack, or innermost COUNT frames."));
2032 add_info_alias ("s", "stack", 1);
2033 add_info ("frame", frame_info
,
2034 _("All about selected stack frame, or frame at ADDR."));
2035 add_info_alias ("f", "frame", 1);
2036 add_info ("locals", locals_info
,
2037 _("Local variables of current stack frame."));
2038 add_info ("args", args_info
,
2039 _("Argument variables of current stack frame."));
2041 add_com ("l", class_info
, args_plus_locals_info
,
2042 _("Argument and local variables of current stack frame."));
2045 add_com ("func", class_stack
, func_command
, _("\
2046 Select the stack frame that contains <func>.\n\
2047 Usage: func <name>\n"));
2049 add_info ("catch", catch_info
,
2050 _("Exceptions that can be caught in the current stack frame."));
2053 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2054 "Specify maximum number of frames for \"backtrace\" to print by default."),
2056 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2057 The maximum number of frames for \"backtrace\" to print by default."));