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 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
)
252 /* There is a LOC_ARG/LOC_REGISTER pair. This means
253 that it was passed on the stack and loaded into a
254 register, or passed in a register and stored in a
255 stack slot. GDB 3.x used the LOC_ARG; GDB
256 4.0-4.11 used the LOC_REGISTER.
258 Reasons for using the LOC_ARG:
260 (1) Because find_saved_registers may be slow for
263 (2) Because registers are often re-used and stack
264 slots rarely (never?) are. Therefore using
265 the stack slot is much less likely to print
268 Reasons why we might want to use the LOC_REGISTER:
270 (1) So that the backtrace prints the same value
271 as "print foo". I see no compelling reason
272 why this needs to be the case; having the
273 backtrace print the value which was passed
274 in, and "print foo" print the value as
275 modified within the called function, makes
278 Additional note: It might be nice if "info args"
279 displayed both values.
281 One more note: There is a case with SPARC
282 structure passing where we need to use the
283 LOC_REGISTER, but this is dealt with by creating
284 a single LOC_REGPARM in symbol reading. */
286 /* Leave sym (the LOC_ARG) alone. */
293 /* Print the current arg. */
295 ui_out_text (uiout
, ", ");
296 ui_out_wrap_hint (uiout
, " ");
298 annotate_arg_begin ();
300 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
301 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
302 SYMBOL_LANGUAGE (sym
),
303 DMGL_PARAMS
| DMGL_ANSI
);
304 ui_out_field_stream (uiout
, "name", stb
);
305 annotate_arg_name_end ();
306 ui_out_text (uiout
, "=");
308 /* Avoid value_print because it will deref ref parameters.
309 We just want to print their addresses. Print ??? for
310 args whose address we do not know. We pass 2 as
311 "recurse" to val_print because our standard indentation
312 here is 4 spaces, and val_print indents 2 for each
314 val
= read_var_value (sym
, frame
);
316 annotate_arg_value (val
== NULL
? NULL
: value_type (val
));
320 common_val_print (val
, stb
->stream
, 0, 0, 2, Val_no_prettyprint
);
321 ui_out_field_stream (uiout
, "value", stb
);
324 ui_out_text (uiout
, "???");
326 /* Invoke ui_out_tuple_end. */
327 do_cleanups (list_chain
);
335 /* Don't print nameless args in situations where we don't know
336 enough about the stack to find them. */
341 if (highest_offset
== -1)
342 start
= gdbarch_frame_args_skip (current_gdbarch
);
344 start
= highest_offset
;
346 print_frame_nameless_args (frame
, start
, num
- args_printed
,
350 do_cleanups (old_chain
);
353 /* Stub for catch_errors. */
356 print_args_stub (void *args
)
358 struct print_args_args
*p
= args
;
361 if (gdbarch_frame_num_args_p (current_gdbarch
))
363 numargs
= gdbarch_frame_num_args (current_gdbarch
, p
->frame
);
364 gdb_assert (numargs
>= 0);
368 print_frame_args (p
->func
, p
->frame
, numargs
, p
->stream
);
372 /* Set the current source and line to the location given by frame
373 FRAME, if possible. When CENTER is true, adjust so the relevant
374 line is in the center of the next 'list'. */
377 set_current_sal_from_frame (struct frame_info
*frame
, int center
)
379 struct symtab_and_line sal
;
381 find_frame_sal (frame
, &sal
);
385 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
386 set_current_source_symtab_and_line (&sal
);
390 /* Print information about frame FRAME. The output is format according
391 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
394 SRC_LINE: Print only source line.
395 LOCATION: Print only location.
396 LOC_AND_SRC: Print location and source line.
398 Used in "where" output, and to emit breakpoint or step
402 print_frame_info (struct frame_info
*frame
, int print_level
,
403 enum print_what print_what
, int print_args
)
405 struct symtab_and_line sal
;
409 if (get_frame_type (frame
) == DUMMY_FRAME
410 || get_frame_type (frame
) == SIGTRAMP_FRAME
)
412 struct cleanup
*uiout_cleanup
413 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
415 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
416 get_frame_pc (frame
));
418 /* Do this regardless of SOURCE because we don't have any source
419 to list for this frame. */
422 ui_out_text (uiout
, "#");
423 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
424 frame_relative_level (frame
));
426 if (ui_out_is_mi_like_p (uiout
))
428 annotate_frame_address ();
429 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
430 annotate_frame_address_end ();
433 if (get_frame_type (frame
) == DUMMY_FRAME
)
435 annotate_function_call ();
436 ui_out_field_string (uiout
, "func", "<function called from gdb>");
438 else if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
440 annotate_signal_handler_caller ();
441 ui_out_field_string (uiout
, "func", "<signal handler called>");
443 ui_out_text (uiout
, "\n");
444 annotate_frame_end ();
446 do_cleanups (uiout_cleanup
);
450 /* If FRAME is not the innermost frame, that normally means that
451 FRAME->pc points to *after* the call instruction, and we want to
452 get the line containing the call, never the next line. But if
453 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
454 next frame was not entered as the result of a call, and we want
455 to get the line containing FRAME->pc. */
456 find_frame_sal (frame
, &sal
);
458 location_print
= (print_what
== LOCATION
459 || print_what
== LOC_AND_ADDRESS
460 || print_what
== SRC_AND_LOC
);
462 if (location_print
|| !sal
.symtab
)
463 print_frame (frame
, print_level
, print_what
, print_args
, sal
);
465 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
467 if (source_print
&& sal
.symtab
)
470 int mid_statement
= ((print_what
== SRC_LINE
)
471 && (get_frame_pc (frame
) != sal
.pc
));
473 if (annotation_level
)
474 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
475 get_frame_pc (frame
));
478 if (deprecated_print_frame_info_listing_hook
)
479 deprecated_print_frame_info_listing_hook (sal
.symtab
,
484 /* We used to do this earlier, but that is clearly
485 wrong. This function is used by many different
486 parts of gdb, including normal_stop in infrun.c,
487 which uses this to print out the current PC
488 when we stepi/nexti into the middle of a source
489 line. Only the command line really wants this
490 behavior. Other UIs probably would like the
491 ability to decide for themselves if it is desired. */
492 if (addressprint
&& mid_statement
)
494 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
495 ui_out_text (uiout
, "\t");
498 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
503 if (print_what
!= LOCATION
)
504 set_default_breakpoint (1, get_frame_pc (frame
), sal
.symtab
, sal
.line
);
506 annotate_frame_end ();
508 gdb_flush (gdb_stdout
);
512 print_frame (struct frame_info
*frame
, int print_level
,
513 enum print_what print_what
, int print_args
,
514 struct symtab_and_line sal
)
517 char *funname
= NULL
;
518 enum language funlang
= language_unknown
;
519 struct ui_stream
*stb
;
520 struct cleanup
*old_chain
, *list_chain
;
522 stb
= ui_out_stream_new (uiout
);
523 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
525 func
= find_pc_function (get_frame_address_in_block (frame
));
528 /* In certain pathological cases, the symtabs give the wrong
529 function (when we are in the first function in a file which
530 is compiled without debugging symbols, the previous function
531 is compiled with debugging symbols, and the "foo.o" symbol
532 that is supposed to tell us where the file with debugging
533 symbols ends has been truncated by ar because it is longer
534 than 15 characters). This also occurs if the user uses asm()
535 to create a function but not stabs for it (in a file compiled
538 So look in the minimal symbol tables as well, and if it comes
539 up with a larger address for the function use that instead.
540 I don't think this can ever cause any problems; there
541 shouldn't be any minimal symbols in the middle of a function;
542 if this is ever changed many parts of GDB will need to be
543 changed (and we'll create a find_pc_minimal_function or some
546 struct minimal_symbol
*msymbol
=
547 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
550 && (SYMBOL_VALUE_ADDRESS (msymbol
)
551 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
553 /* We also don't know anything about the function besides
554 its address and name. */
556 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
557 funlang
= SYMBOL_LANGUAGE (msymbol
);
561 funname
= DEPRECATED_SYMBOL_NAME (func
);
562 funlang
= SYMBOL_LANGUAGE (func
);
563 if (funlang
== language_cplus
)
565 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
566 to display the demangled name that we already have
567 stored in the symbol table, but we stored a version
568 with DMGL_PARAMS turned on, and here we don't want to
569 display parameters. So call the demangler again, with
572 Yes, printf_symbol_filtered() will again try to
573 demangle the name on the fly, but the issue is that
574 if cplus_demangle() fails here, it will fail there
575 too. So we want to catch the failure (where DEMANGLED
576 is NULL below) here, while we still have our hands on
577 the function symbol.) */
578 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
579 if (demangled
== NULL
)
580 /* If the demangler fails, try the demangled name from
581 the symbol table. That'll have parameters, but
582 that's preferable to displaying a mangled name. */
583 funname
= SYMBOL_PRINT_NAME (func
);
589 struct minimal_symbol
*msymbol
=
590 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
594 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
595 funlang
= SYMBOL_LANGUAGE (msymbol
);
599 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
600 get_frame_pc (frame
));
602 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
606 ui_out_text (uiout
, "#");
607 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
608 frame_relative_level (frame
));
611 if (get_frame_pc (frame
) != sal
.pc
|| !sal
.symtab
612 || print_what
== LOC_AND_ADDRESS
)
614 annotate_frame_address ();
615 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
616 annotate_frame_address_end ();
617 ui_out_text (uiout
, " in ");
619 annotate_frame_function_name ();
620 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
622 ui_out_field_stream (uiout
, "func", stb
);
623 ui_out_wrap_hint (uiout
, " ");
624 annotate_frame_args ();
626 ui_out_text (uiout
, " (");
629 struct print_args_args args
;
630 struct cleanup
*args_list_chain
;
633 args
.stream
= gdb_stdout
;
634 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
635 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
636 /* FIXME: ARGS must be a list. If one argument is a string it
637 will have " that will not be properly escaped. */
638 /* Invoke ui_out_tuple_end. */
639 do_cleanups (args_list_chain
);
642 ui_out_text (uiout
, ")");
643 if (sal
.symtab
&& sal
.symtab
->filename
)
645 annotate_frame_source_begin ();
646 ui_out_wrap_hint (uiout
, " ");
647 ui_out_text (uiout
, " at ");
648 annotate_frame_source_file ();
649 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
650 if (ui_out_is_mi_like_p (uiout
))
652 const char *fullname
= symtab_to_fullname (sal
.symtab
);
653 if (fullname
!= NULL
)
654 ui_out_field_string (uiout
, "fullname", fullname
);
656 annotate_frame_source_file_end ();
657 ui_out_text (uiout
, ":");
658 annotate_frame_source_line ();
659 ui_out_field_int (uiout
, "line", sal
.line
);
660 annotate_frame_source_end ();
663 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
666 char *lib
= PC_SOLIB (get_frame_pc (frame
));
668 char *lib
= solib_address (get_frame_pc (frame
));
672 annotate_frame_where ();
673 ui_out_wrap_hint (uiout
, " ");
674 ui_out_text (uiout
, " from ");
675 ui_out_field_string (uiout
, "from", lib
);
679 /* do_cleanups will call ui_out_tuple_end() for us. */
680 do_cleanups (list_chain
);
681 ui_out_text (uiout
, "\n");
682 do_cleanups (old_chain
);
685 /* Show the frame info. If this is the tui, it will be shown in the
686 source display otherwise, nothing is done. */
689 show_stack_frame (struct frame_info
*frame
)
694 /* Read a frame specification in whatever the appropriate format is
695 from FRAME_EXP. Call error(), printing MESSAGE, if the
696 specification is in any way invalid (so this function never returns
697 NULL). When SEPECTED_P is non-NULL set its target to indicate that
698 the default selected frame was used. */
700 static struct frame_info
*
701 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
702 int *selected_frame_p
)
705 struct value
*args
[4];
706 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
708 if (frame_exp
== NULL
)
713 struct cleanup
*tmp_cleanup
;
719 struct cleanup
*cleanup
;
722 /* Skip leading white space, bail of EOL. */
723 while (isspace (*frame_exp
))
728 /* Parse the argument, extract it, save it. */
732 addr_string
= savestring (frame_exp
, p
- frame_exp
);
734 cleanup
= make_cleanup (xfree
, addr_string
);
736 /* NOTE: Parse and evaluate expression, but do not use
737 functions such as parse_and_eval_long or
738 parse_and_eval_address to also extract the value.
739 Instead value_as_long and value_as_address are used.
740 This avoids problems with expressions that contain
742 if (numargs
>= ARRAY_SIZE (args
))
743 error (_("Too many args in frame specification"));
744 args
[numargs
++] = parse_and_eval (addr_string
);
746 do_cleanups (cleanup
);
750 /* If no args, default to the selected frame. */
753 if (selected_frame_p
!= NULL
)
754 (*selected_frame_p
) = 1;
755 return get_selected_frame (message
);
758 /* None of the remaining use the selected frame. */
759 if (selected_frame_p
!= NULL
)
760 (*selected_frame_p
) = 0;
762 /* Assume the single arg[0] is an integer, and try using that to
763 select a frame relative to current. */
766 struct frame_info
*fid
;
767 int level
= value_as_long (args
[0]);
768 fid
= find_relative_frame (get_current_frame (), &level
);
770 /* find_relative_frame was successful */
774 /* Convert each value into a corresponding address. */
777 for (i
= 0; i
< numargs
; i
++)
778 addrs
[i
] = value_as_address (args
[0]);
781 /* Assume that the single arg[0] is an address, use that to identify
782 a frame with a matching ID. Should this also accept stack/pc or
786 struct frame_id id
= frame_id_build_wild (addrs
[0]);
787 struct frame_info
*fid
;
789 /* If (s)he specifies the frame with an address, he deserves
790 what (s)he gets. Still, give the highest one that matches.
791 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
793 for (fid
= get_current_frame ();
795 fid
= get_prev_frame (fid
))
797 if (frame_id_eq (id
, get_frame_id (fid
)))
799 while (frame_id_eq (id
, frame_unwind_id (fid
)))
800 fid
= get_prev_frame (fid
);
806 /* We couldn't identify the frame as an existing frame, but
807 perhaps we can create one with a single argument. */
809 return create_new_frame (addrs
[0], 0);
810 else if (numargs
== 2)
811 return create_new_frame (addrs
[0], addrs
[1]);
813 error (_("Too many args in frame specification"));
816 static struct frame_info
*
817 parse_frame_specification (char *frame_exp
)
819 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
822 /* Print verbosely the selected frame or the frame at address
823 ADDR_EXP. Absolutely all information in the frame is printed. */
826 frame_info (char *addr_exp
, int from_tty
)
828 struct frame_info
*fi
;
829 struct symtab_and_line sal
;
832 struct frame_info
*calling_frame_info
;
833 int i
, count
, numregs
;
835 enum language funlang
= language_unknown
;
836 const char *pc_regname
;
837 int selected_frame_p
;
839 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
841 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
842 is not a good name. */
843 if (gdbarch_pc_regnum (current_gdbarch
) >= 0)
844 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
845 easily not match that of the internal value returned by
847 pc_regname
= gdbarch_register_name (current_gdbarch
,
848 gdbarch_pc_regnum (current_gdbarch
));
850 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
851 architectures will often have a hardware register called "pc",
852 and that register's value, again, can easily not match
856 find_frame_sal (fi
, &sal
);
857 func
= get_frame_function (fi
);
858 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
860 s
= find_pc_symtab (get_frame_pc (fi
));
863 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
864 display the demangled name that we already have stored in the
865 symbol table, but we stored a version with DMGL_PARAMS turned
866 on, and here we don't want to display parameters. So call the
867 demangler again, with DMGL_ANSI only.
869 Yes, printf_symbol_filtered() will again try to demangle the
870 name on the fly, but the issue is that if cplus_demangle()
871 fails here, it will fail there too. So we want to catch the
872 failure (where DEMANGLED is NULL below) here, while we still
873 have our hands on the function symbol.) */
874 funname
= DEPRECATED_SYMBOL_NAME (func
);
875 funlang
= SYMBOL_LANGUAGE (func
);
876 if (funlang
== language_cplus
)
878 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
879 /* If the demangler fails, try the demangled name from the
880 symbol table. That'll have parameters, but that's
881 preferable to displaying a mangled name. */
882 if (demangled
== NULL
)
883 funname
= SYMBOL_PRINT_NAME (func
);
888 struct minimal_symbol
*msymbol
;
890 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
893 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
894 funlang
= SYMBOL_LANGUAGE (msymbol
);
897 calling_frame_info
= get_prev_frame (fi
);
899 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
901 printf_filtered (_("Stack level %d, frame at "),
902 frame_relative_level (fi
));
906 printf_filtered (_("Stack frame at "));
908 deprecated_print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
909 printf_filtered (":\n");
910 printf_filtered (" %s = ", pc_regname
);
911 deprecated_print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
916 printf_filtered (" in ");
917 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
918 DMGL_ANSI
| DMGL_PARAMS
);
922 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
923 puts_filtered ("; ");
925 printf_filtered ("saved %s ", pc_regname
);
926 deprecated_print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
927 printf_filtered ("\n");
929 if (calling_frame_info
== NULL
)
931 enum unwind_stop_reason reason
;
933 reason
= get_frame_unwind_stop_reason (fi
);
934 if (reason
!= UNWIND_NO_REASON
)
935 printf_filtered (_(" Outermost frame: %s\n"),
936 frame_stop_reason_string (reason
));
939 if (calling_frame_info
)
941 printf_filtered (" called by frame at ");
942 deprecated_print_address_numeric (get_frame_base (calling_frame_info
),
945 if (get_next_frame (fi
) && calling_frame_info
)
948 if (get_next_frame (fi
))
950 printf_filtered (" caller of frame at ");
951 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
954 if (get_next_frame (fi
) || calling_frame_info
)
955 puts_filtered ("\n");
958 printf_filtered (" source language %s.\n",
959 language_str (s
->language
));
962 /* Address of the argument list for this frame, or 0. */
963 CORE_ADDR arg_list
= get_frame_args_address (fi
);
964 /* Number of args for this frame, or -1 if unknown. */
968 printf_filtered (" Arglist at unknown address.\n");
971 printf_filtered (" Arglist at ");
972 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
973 printf_filtered (",");
975 if (!gdbarch_frame_num_args_p (current_gdbarch
))
978 puts_filtered (" args: ");
982 numargs
= gdbarch_frame_num_args (current_gdbarch
, fi
);
983 gdb_assert (numargs
>= 0);
985 puts_filtered (" no args.");
986 else if (numargs
== 1)
987 puts_filtered (" 1 arg: ");
989 printf_filtered (" %d args: ", numargs
);
991 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
992 puts_filtered ("\n");
996 /* Address of the local variables for this frame, or 0. */
997 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1000 printf_filtered (" Locals at unknown address,");
1003 printf_filtered (" Locals at ");
1004 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1005 printf_filtered (",");
1009 /* Print as much information as possible on the location of all the
1012 enum lval_type lval
;
1020 /* The sp is special; what's displayed isn't the save address, but
1021 the value of the previous frame's sp. This is a legacy thing,
1022 at one stage the frame cached the previous frame's SP instead
1023 of its address, hence it was easiest to just display the cached
1025 if (gdbarch_sp_regnum (current_gdbarch
) >= 0)
1027 /* Find out the location of the saved stack pointer with out
1028 actually evaluating it. */
1029 frame_register_unwind (fi
, gdbarch_sp_regnum (current_gdbarch
),
1030 &optimized
, &lval
, &addr
,
1032 if (!optimized
&& lval
== not_lval
)
1034 gdb_byte value
[MAX_REGISTER_SIZE
];
1036 frame_register_unwind (fi
, gdbarch_sp_regnum (current_gdbarch
),
1037 &optimized
, &lval
, &addr
,
1039 /* NOTE: cagney/2003-05-22: This is assuming that the
1040 stack pointer was packed as an unsigned integer. That
1041 may or may not be valid. */
1042 sp
= extract_unsigned_integer (value
,
1043 register_size (current_gdbarch
,
1044 gdbarch_sp_regnum (current_gdbarch
)));
1045 printf_filtered (" Previous frame's sp is ");
1046 deprecated_print_address_numeric (sp
, 1, gdb_stdout
);
1047 printf_filtered ("\n");
1050 else if (!optimized
&& lval
== lval_memory
)
1052 printf_filtered (" Previous frame's sp at ");
1053 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1054 printf_filtered ("\n");
1057 else if (!optimized
&& lval
== lval_register
)
1059 printf_filtered (" Previous frame's sp in %s\n",
1060 gdbarch_register_name (current_gdbarch
, realnum
));
1063 /* else keep quiet. */
1067 numregs
= gdbarch_num_regs (current_gdbarch
)
1068 + gdbarch_num_pseudo_regs (current_gdbarch
);
1069 for (i
= 0; i
< numregs
; i
++)
1070 if (i
!= gdbarch_sp_regnum (current_gdbarch
)
1071 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1073 /* Find out the location of the saved register without
1074 fetching the corresponding value. */
1075 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1077 /* For moment, only display registers that were saved on the
1079 if (!optimized
&& lval
== lval_memory
)
1082 puts_filtered (" Saved registers:\n ");
1084 puts_filtered (",");
1086 printf_filtered (" %s at ",
1087 gdbarch_register_name (current_gdbarch
, i
));
1088 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1092 if (count
|| need_nl
)
1093 puts_filtered ("\n");
1097 /* Print briefly all stack frames or just the innermost COUNT_EXP
1101 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1103 struct frame_info
*fi
;
1106 struct frame_info
*trailing
;
1109 if (!target_has_stack
)
1110 error (_("No stack."));
1112 /* The following code must do two things. First, it must set the
1113 variable TRAILING to the frame from which we should start
1114 printing. Second, it must set the variable count to the number
1115 of frames which we should print, or -1 if all of them. */
1116 trailing
= get_current_frame ();
1118 /* The target can be in a state where there is no valid frames
1119 (e.g., just connected). */
1120 if (trailing
== NULL
)
1121 error (_("No stack."));
1126 count
= parse_and_eval_long (count_exp
);
1129 struct frame_info
*current
;
1134 while (current
&& count
--)
1137 current
= get_prev_frame (current
);
1140 /* Will stop when CURRENT reaches the top of the stack.
1141 TRAILING will be COUNT below it. */
1145 trailing
= get_prev_frame (trailing
);
1146 current
= get_prev_frame (current
);
1158 struct partial_symtab
*ps
;
1160 /* Read in symbols for all of the frames. Need to do this in a
1161 separate pass so that "Reading in symbols for xxx" messages
1162 don't screw up the appearance of the backtrace. Also if
1163 people have strong opinions against reading symbols for
1164 backtrace this may have to be an option. */
1166 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1169 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1171 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1175 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1179 /* Don't use print_stack_frame; if an error() occurs it probably
1180 means further attempts to backtrace would fail (on the other
1181 hand, perhaps the code does or could be fixed to make sure
1182 the frame->prev field gets set to NULL in that case). */
1183 print_frame_info (fi
, 1, LOCATION
, 1);
1185 print_frame_local_vars (fi
, 1, gdb_stdout
);
1187 /* Save the last frame to check for error conditions. */
1191 /* If we've stopped before the end, mention that. */
1193 printf_filtered (_("(More stack frames follow...)\n"));
1195 /* If we've run out of frames, and the reason appears to be an error
1196 condition, print it. */
1197 if (fi
== NULL
&& trailing
!= NULL
)
1199 enum unwind_stop_reason reason
;
1201 reason
= get_frame_unwind_stop_reason (trailing
);
1202 if (reason
> UNWIND_FIRST_ERROR
)
1203 printf_filtered (_("Backtrace stopped: %s\n"),
1204 frame_stop_reason_string (reason
));
1208 struct backtrace_command_args
1215 /* Stub for catch_errors. */
1218 backtrace_command_stub (void *data
)
1220 struct backtrace_command_args
*args
= data
;
1221 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1226 backtrace_command (char *arg
, int from_tty
)
1228 struct cleanup
*old_chain
= NULL
;
1229 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1230 struct backtrace_command_args btargs
;
1237 argv
= buildargv (arg
);
1238 old_chain
= make_cleanup_freeargv (argv
);
1240 for (i
= 0; argv
[i
]; i
++)
1244 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1245 argv
[i
][j
] = tolower (argv
[i
][j
]);
1247 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1248 fulltrace_arg
= argc
;
1251 arglen
+= strlen (argv
[i
]);
1256 if (fulltrace_arg
>= 0)
1260 arg
= xmalloc (arglen
+ 1);
1261 memset (arg
, 0, arglen
+ 1);
1262 for (i
= 0; i
< (argc
+ 1); i
++)
1264 if (i
!= fulltrace_arg
)
1266 strcat (arg
, argv
[i
]);
1276 btargs
.count_exp
= arg
;
1277 btargs
.show_locals
= (fulltrace_arg
>= 0);
1278 btargs
.from_tty
= from_tty
;
1279 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1281 if (fulltrace_arg
>= 0 && arglen
> 0)
1285 do_cleanups (old_chain
);
1289 backtrace_full_command (char *arg
, int from_tty
)
1291 struct backtrace_command_args btargs
;
1292 btargs
.count_exp
= arg
;
1293 btargs
.show_locals
= 1;
1294 btargs
.from_tty
= from_tty
;
1295 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1299 /* Print the local variables of a block B active in FRAME on STREAM.
1300 Return 1 if any variables were printed; 0 otherwise. */
1303 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1304 int num_tabs
, struct ui_file
*stream
)
1306 struct dict_iterator iter
;
1308 int values_printed
= 0;
1311 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1313 switch (SYMBOL_CLASS (sym
))
1321 for (j
= 0; j
< num_tabs
; j
++)
1322 fputs_filtered ("\t", stream
);
1323 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1324 fputs_filtered (" = ", stream
);
1325 print_variable_value (sym
, frame
, stream
);
1326 fprintf_filtered (stream
, "\n");
1330 /* Ignore symbols which are not locals. */
1335 return values_printed
;
1338 /* Same, but print labels. */
1341 print_block_frame_labels (struct block
*b
, int *have_default
,
1342 struct ui_file
*stream
)
1344 struct dict_iterator iter
;
1346 int values_printed
= 0;
1348 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1350 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1356 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1358 struct symtab_and_line sal
;
1359 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1361 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1364 fprintf_filtered (stream
, " ");
1365 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1367 fprintf_filtered (stream
, " in file %s, line %d\n",
1368 sal
.symtab
->filename
, sal
.line
);
1372 return values_printed
;
1375 /* Print on STREAM all the local variables in frame FRAME, including
1376 all the blocks active in that frame at its current PC.
1378 Returns 1 if the job was done, or 0 if nothing was printed because
1379 we have no info on the function running in FRAME. */
1382 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1383 struct ui_file
*stream
)
1385 struct block
*block
= get_frame_block (frame
, 0);
1386 int values_printed
= 0;
1390 fprintf_filtered (stream
, "No symbol table info available.\n");
1396 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1398 /* After handling the function's top-level block, stop. Don't
1399 continue to its superblock, the block of per-file symbols. */
1400 if (BLOCK_FUNCTION (block
))
1402 block
= BLOCK_SUPERBLOCK (block
);
1405 if (!values_printed
)
1406 fprintf_filtered (stream
, _("No locals.\n"));
1409 /* Same, but print labels. */
1412 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1413 struct ui_file
*stream
)
1415 struct blockvector
*bl
;
1416 struct block
*block
= get_frame_block (frame
, 0);
1417 int values_printed
= 0;
1418 int index
, have_default
= 0;
1419 char *blocks_printed
;
1420 CORE_ADDR pc
= get_frame_pc (frame
);
1424 fprintf_filtered (stream
, "No symbol table info available.\n");
1428 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1429 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1430 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1434 CORE_ADDR end
= BLOCK_END (block
) - 4;
1437 if (bl
!= blockvector_for_pc (end
, &index
))
1438 error (_("blockvector blotch"));
1439 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1440 error (_("blockvector botch"));
1441 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1444 /* Don't print out blocks that have gone by. */
1445 while (index
< last_index
1446 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1449 while (index
< last_index
1450 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1452 if (blocks_printed
[index
] == 0)
1454 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1455 &have_default
, stream
))
1457 blocks_printed
[index
] = 1;
1463 if (values_printed
&& this_level_only
)
1466 /* After handling the function's top-level block, stop. Don't
1467 continue to its superblock, the block of per-file symbols. */
1468 if (BLOCK_FUNCTION (block
))
1470 block
= BLOCK_SUPERBLOCK (block
);
1473 if (!values_printed
&& !this_level_only
)
1474 fprintf_filtered (stream
, _("No catches.\n"));
1478 locals_info (char *args
, int from_tty
)
1480 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1485 catch_info (char *ignore
, int from_tty
)
1487 struct symtab_and_line
*sal
;
1489 /* Check for target support for exception handling */
1490 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1493 /* Currently not handling this. Ideally, here we should
1494 interact with the C++ runtime system to find the list of
1495 active handlers, etc. */
1496 fprintf_filtered (gdb_stdout
, _("\
1497 Info catch not supported with this target/compiler combination.\n"));
1501 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1502 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1508 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1510 struct symbol
*func
= get_frame_function (frame
);
1512 struct dict_iterator iter
;
1513 struct symbol
*sym
, *sym2
;
1514 int values_printed
= 0;
1518 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1522 b
= SYMBOL_BLOCK_VALUE (func
);
1523 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1525 switch (SYMBOL_CLASS (sym
))
1531 case LOC_REGPARM_ADDR
:
1532 case LOC_BASEREG_ARG
:
1533 case LOC_COMPUTED_ARG
:
1535 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1536 fputs_filtered (" = ", stream
);
1538 /* We have to look up the symbol because arguments can have
1539 two entries (one a parameter, one a local) and the one we
1540 want is the local, which lookup_symbol will find for us.
1541 This includes gcc1 (not gcc2) on the sparc when passing a
1542 small structure and gcc2 when the argument type is float
1543 and it is passed as a double and converted to float by
1544 the prologue (in the latter case the type of the LOC_ARG
1545 symbol is double and the type of the LOC_LOCAL symbol is
1546 float). There are also LOC_ARG/LOC_REGISTER pairs which
1547 are not combined in symbol-reading. */
1549 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1550 b
, VAR_DOMAIN
, NULL
, NULL
);
1551 print_variable_value (sym2
, frame
, stream
);
1552 fprintf_filtered (stream
, "\n");
1556 /* Don't worry about things which aren't arguments. */
1561 if (!values_printed
)
1562 fprintf_filtered (stream
, _("No arguments.\n"));
1566 args_info (char *ignore
, int from_tty
)
1568 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1574 args_plus_locals_info (char *ignore
, int from_tty
)
1576 args_info (ignore
, from_tty
);
1577 locals_info (ignore
, from_tty
);
1581 /* Select frame FRAME. Also print the stack frame and show the source
1582 if this is the tui version. */
1584 select_and_print_frame (struct frame_info
*frame
)
1586 select_frame (frame
);
1588 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1591 /* Return the symbol-block in which the selected frame is executing.
1592 Can return zero under various legitimate circumstances.
1594 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1595 code address within the block returned. We use this to decide
1596 which macros are in scope. */
1599 get_selected_block (CORE_ADDR
*addr_in_block
)
1601 if (!target_has_stack
)
1604 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1607 /* Find a frame a certain number of levels away from FRAME.
1608 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1609 Positive means go to earlier frames (up); negative, the reverse.
1610 The int that contains the number of levels is counted toward
1611 zero as the frames for those levels are found.
1612 If the top or bottom frame is reached, that frame is returned,
1613 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1614 how much farther the original request asked to go. */
1617 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1619 /* Going up is simple: just call get_prev_frame enough times or
1620 until the initial frame is reached. */
1621 while (*level_offset_ptr
> 0)
1623 struct frame_info
*prev
= get_prev_frame (frame
);
1626 (*level_offset_ptr
)--;
1630 /* Going down is just as simple. */
1631 while (*level_offset_ptr
< 0)
1633 struct frame_info
*next
= get_next_frame (frame
);
1636 (*level_offset_ptr
)++;
1643 /* The "select_frame" command. With no argument this is a NOP.
1644 Select the frame at level LEVEL_EXP if it is a valid level.
1645 Otherwise, treat LEVEL_EXP as an address expression and select it.
1647 See parse_frame_specification for more info on proper frame
1651 select_frame_command (char *level_exp
, int from_tty
)
1653 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1656 /* The "frame" command. With no argument, print the selected frame
1657 briefly. With an argument, behave like select_frame and then print
1658 the selected frame. */
1661 frame_command (char *level_exp
, int from_tty
)
1663 select_frame_command (level_exp
, from_tty
);
1664 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1667 /* The XDB Compatibility command to print the current frame. */
1670 current_frame_command (char *level_exp
, int from_tty
)
1672 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1675 /* Select the frame up one or COUNT_EXP stack levels from the
1676 previously selected frame, and print it briefly. */
1679 up_silently_base (char *count_exp
)
1681 struct frame_info
*frame
;
1685 count
= parse_and_eval_long (count_exp
);
1687 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1688 if (count
!= 0 && count_exp
== NULL
)
1689 error (_("Initial frame selected; you cannot go up."));
1690 select_frame (frame
);
1694 up_silently_command (char *count_exp
, int from_tty
)
1696 up_silently_base (count_exp
);
1700 up_command (char *count_exp
, int from_tty
)
1702 up_silently_base (count_exp
);
1703 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1706 /* Select the frame down one or COUNT_EXP stack levels from the previously
1707 selected frame, and print it briefly. */
1710 down_silently_base (char *count_exp
)
1712 struct frame_info
*frame
;
1715 count
= -parse_and_eval_long (count_exp
);
1717 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1718 if (count
!= 0 && count_exp
== NULL
)
1720 /* We only do this if COUNT_EXP is not specified. That way
1721 "down" means to really go down (and let me know if that is
1722 impossible), but "down 9999" can be used to mean go all the
1723 way down without getting an error. */
1725 error (_("Bottom (innermost) frame selected; you cannot go down."));
1728 select_frame (frame
);
1732 down_silently_command (char *count_exp
, int from_tty
)
1734 down_silently_base (count_exp
);
1738 down_command (char *count_exp
, int from_tty
)
1740 down_silently_base (count_exp
);
1741 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1746 return_command (char *retval_exp
, int from_tty
)
1748 struct symbol
*thisfun
;
1749 struct value
*return_value
= NULL
;
1750 const char *query_prefix
= "";
1752 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1754 /* Compute the return value. If the computation triggers an error,
1755 let it bail. If the return type can't be handled, set
1756 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1760 struct type
*return_type
= NULL
;
1762 /* Compute the return value. Should the computation fail, this
1763 call throws an error. */
1764 return_value
= parse_and_eval (retval_exp
);
1766 /* Cast return value to the return type of the function. Should
1767 the cast fail, this call throws an error. */
1768 if (thisfun
!= NULL
)
1769 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1770 if (return_type
== NULL
)
1771 return_type
= builtin_type_int
;
1772 CHECK_TYPEDEF (return_type
);
1773 return_value
= value_cast (return_type
, return_value
);
1775 /* Make sure the value is fully evaluated. It may live in the
1776 stack frame we're about to pop. */
1777 if (value_lazy (return_value
))
1778 value_fetch_lazy (return_value
);
1780 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1781 /* If the return-type is "void", don't try to find the
1782 return-value's location. However, do still evaluate the
1783 return expression so that, even when the expression result
1784 is discarded, side effects such as "return i++" still
1786 return_value
= NULL
;
1787 /* FIXME: cagney/2004-01-17: If the architecture implements both
1788 return_value and extract_returned_value_address, should allow
1789 "return" to work - don't set return_value to NULL. */
1790 else if (!gdbarch_return_value_p (current_gdbarch
)
1791 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1792 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1794 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1795 code. Old architectures don't expect STORE_RETURN_VALUE
1796 to be called with with a small struct that needs to be
1797 stored in registers. Don't start doing it now. */
1799 A structure or union return type is not supported by this architecture.\n\
1800 If you continue, the return value that you specified will be ignored.\n";
1801 return_value
= NULL
;
1803 else if (using_struct_return (return_type
, 0))
1806 The location at which to store the function's return value is unknown.\n\
1807 If you continue, the return value that you specified will be ignored.\n";
1808 return_value
= NULL
;
1812 /* Does an interactive user really want to do this? Include
1813 information, such as how well GDB can handle the return value, in
1814 the query message. */
1818 if (thisfun
== NULL
)
1819 confirmed
= query (_("%sMake selected stack frame return now? "),
1822 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1823 SYMBOL_PRINT_NAME (thisfun
));
1825 error (_("Not confirmed"));
1828 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1829 frame in turn, should this code just go straight to the relevant
1830 frame and pop that? */
1832 /* First discard all frames inner-to the selected frame (making the
1833 selected frame current). */
1835 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1836 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1838 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1839 /* Caught in the safety net, oops! We've gone way past the
1841 error (_("Problem while popping stack frames (corrupt stack?)"));
1842 frame_pop (get_current_frame ());
1846 /* Second discard the selected frame (which is now also the current
1848 frame_pop (get_current_frame ());
1850 /* Store RETURN_VALUE in the just-returned register set. */
1851 if (return_value
!= NULL
)
1853 struct type
*return_type
= value_type (return_value
);
1854 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1856 == RETURN_VALUE_REGISTER_CONVENTION
);
1857 gdbarch_return_value (current_gdbarch
, return_type
,
1858 get_current_regcache (), NULL
/*read*/,
1859 value_contents (return_value
) /*write*/);
1862 /* If we are at the end of a call dummy now, pop the dummy frame
1864 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1865 frame_pop (get_current_frame ());
1867 /* If interactive, print the frame that is now current. */
1869 frame_command ("0", 1);
1871 select_frame_command ("0", 0);
1874 /* Sets the scope to input function name, provided that the function
1875 is within the current stack frame */
1877 struct function_bounds
1879 CORE_ADDR low
, high
;
1883 func_command (char *arg
, int from_tty
)
1885 struct frame_info
*frame
;
1887 struct symtabs_and_lines sals
;
1890 struct function_bounds
*func_bounds
= NULL
;
1895 frame
= parse_frame_specification ("0");
1896 sals
= decode_line_spec (arg
, 1);
1897 func_bounds
= (struct function_bounds
*) xmalloc (
1898 sizeof (struct function_bounds
) * sals
.nelts
);
1899 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1901 if (sals
.sals
[i
].pc
== 0
1902 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1903 &func_bounds
[i
].low
,
1904 &func_bounds
[i
].high
) == 0)
1906 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1912 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1913 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1914 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1918 frame
= find_relative_frame (frame
, &level
);
1921 while (!found
&& level
== 0);
1924 xfree (func_bounds
);
1927 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1928 else if (frame
!= get_selected_frame (NULL
))
1929 select_and_print_frame (frame
);
1932 /* Gets the language of the current frame. */
1935 get_frame_language (void)
1937 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1941 /* We determine the current frame language by looking up its
1942 associated symtab. To retrieve this symtab, we use the frame
1943 PC. However we cannot use the frame PC as is, because it
1944 usually points to the instruction following the "call", which
1945 is sometimes the first instruction of another function. So
1946 we rely on get_frame_address_in_block(), it provides us with
1947 a PC that is guaranteed to be inside the frame's code
1949 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1950 struct symtab
*s
= find_pc_symtab (pc
);
1956 return language_unknown
;
1960 /* Provide a prototype to silence -Wmissing-prototypes. */
1961 void _initialize_stack (void);
1964 _initialize_stack (void)
1967 backtrace_limit
= 30;
1970 add_com ("return", class_stack
, return_command
, _("\
1971 Make selected stack frame return to its caller.\n\
1972 Control remains in the debugger, but when you continue\n\
1973 execution will resume in the frame above the one now selected.\n\
1974 If an argument is given, it is an expression for the value to return."));
1976 add_com ("up", class_stack
, up_command
, _("\
1977 Select and print stack frame that called this one.\n\
1978 An argument says how many frames up to go."));
1979 add_com ("up-silently", class_support
, up_silently_command
, _("\
1980 Same as the `up' command, but does not print anything.\n\
1981 This is useful in command scripts."));
1983 add_com ("down", class_stack
, down_command
, _("\
1984 Select and print stack frame called by this one.\n\
1985 An argument says how many frames down to go."));
1986 add_com_alias ("do", "down", class_stack
, 1);
1987 add_com_alias ("dow", "down", class_stack
, 1);
1988 add_com ("down-silently", class_support
, down_silently_command
, _("\
1989 Same as the `down' command, but does not print anything.\n\
1990 This is useful in command scripts."));
1992 add_com ("frame", class_stack
, frame_command
, _("\
1993 Select and print a stack frame.\n\
1994 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1995 An argument specifies the frame to select.\n\
1996 It can be a stack frame number or the address of the frame.\n\
1997 With argument, nothing is printed if input is coming from\n\
1998 a command file or a user-defined command."));
2000 add_com_alias ("f", "frame", class_stack
, 1);
2004 add_com ("L", class_stack
, current_frame_command
,
2005 _("Print the current stack frame.\n"));
2006 add_com_alias ("V", "frame", class_stack
, 1);
2008 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2009 Select a stack frame without printing anything.\n\
2010 An argument specifies the frame to select.\n\
2011 It can be a stack frame number or the address of the frame.\n"));
2013 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2014 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2015 With a negative argument, print outermost -COUNT frames.\n\
2016 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2017 add_com_alias ("bt", "backtrace", class_stack
, 0);
2020 add_com_alias ("t", "backtrace", class_stack
, 0);
2021 add_com ("T", class_stack
, backtrace_full_command
, _("\
2022 Print backtrace of all stack frames, or innermost COUNT frames \n\
2023 and the values of the local variables.\n\
2024 With a negative argument, print outermost -COUNT frames.\n\
2025 Usage: T <count>\n"));
2028 add_com_alias ("where", "backtrace", class_alias
, 0);
2029 add_info ("stack", backtrace_command
,
2030 _("Backtrace of the stack, or innermost COUNT frames."));
2031 add_info_alias ("s", "stack", 1);
2032 add_info ("frame", frame_info
,
2033 _("All about selected stack frame, or frame at ADDR."));
2034 add_info_alias ("f", "frame", 1);
2035 add_info ("locals", locals_info
,
2036 _("Local variables of current stack frame."));
2037 add_info ("args", args_info
,
2038 _("Argument variables of current stack frame."));
2040 add_com ("l", class_info
, args_plus_locals_info
,
2041 _("Argument and local variables of current stack frame."));
2044 add_com ("func", class_stack
, func_command
, _("\
2045 Select the stack frame that contains <func>.\n\
2046 Usage: func <name>\n"));
2048 add_info ("catch", catch_info
,
2049 _("Exceptions that can be caught in the current stack frame."));
2052 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2053 "Specify maximum number of frames for \"backtrace\" to print by default."),
2055 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2056 The maximum number of frames for \"backtrace\" to print by default."));