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
= FRAME_ARGS_SKIP
;
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 (FRAME_NUM_ARGS_P ())
363 numargs
= FRAME_NUM_ARGS (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. */
844 /* OK, this is weird. The PC_REGNUM hardware register's value can
845 easily not match that of the internal value returned by
847 pc_regname
= REGISTER_NAME (PC_REGNUM
);
849 /* But then, this is weird to. Even without PC_REGNUM, an
850 architectures will often have a hardware register called "pc",
851 and that register's value, again, can easily not match
855 find_frame_sal (fi
, &sal
);
856 func
= get_frame_function (fi
);
857 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
859 s
= find_pc_symtab (get_frame_pc (fi
));
862 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
863 display the demangled name that we already have stored in the
864 symbol table, but we stored a version with DMGL_PARAMS turned
865 on, and here we don't want to display parameters. So call the
866 demangler again, with DMGL_ANSI only.
868 Yes, printf_symbol_filtered() will again try to demangle the
869 name on the fly, but the issue is that if cplus_demangle()
870 fails here, it will fail there too. So we want to catch the
871 failure (where DEMANGLED is NULL below) here, while we still
872 have our hands on the function symbol.) */
873 funname
= DEPRECATED_SYMBOL_NAME (func
);
874 funlang
= SYMBOL_LANGUAGE (func
);
875 if (funlang
== language_cplus
)
877 char *demangled
= cplus_demangle (funname
, DMGL_ANSI
);
878 /* If the demangler fails, try the demangled name from the
879 symbol table. That'll have parameters, but that's
880 preferable to displaying a mangled name. */
881 if (demangled
== NULL
)
882 funname
= SYMBOL_PRINT_NAME (func
);
887 struct minimal_symbol
*msymbol
;
889 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
892 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
893 funlang
= SYMBOL_LANGUAGE (msymbol
);
896 calling_frame_info
= get_prev_frame (fi
);
898 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
900 printf_filtered (_("Stack level %d, frame at "),
901 frame_relative_level (fi
));
905 printf_filtered (_("Stack frame at "));
907 deprecated_print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
908 printf_filtered (":\n");
909 printf_filtered (" %s = ", pc_regname
);
910 deprecated_print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
915 printf_filtered (" in ");
916 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
917 DMGL_ANSI
| DMGL_PARAMS
);
921 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
922 puts_filtered ("; ");
924 printf_filtered ("saved %s ", pc_regname
);
925 deprecated_print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
926 printf_filtered ("\n");
928 if (calling_frame_info
== NULL
)
930 enum unwind_stop_reason reason
;
932 reason
= get_frame_unwind_stop_reason (fi
);
933 if (reason
!= UNWIND_NO_REASON
)
934 printf_filtered (_(" Outermost frame: %s\n"),
935 frame_stop_reason_string (reason
));
938 if (calling_frame_info
)
940 printf_filtered (" called by frame at ");
941 deprecated_print_address_numeric (get_frame_base (calling_frame_info
),
944 if (get_next_frame (fi
) && calling_frame_info
)
947 if (get_next_frame (fi
))
949 printf_filtered (" caller of frame at ");
950 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
953 if (get_next_frame (fi
) || calling_frame_info
)
954 puts_filtered ("\n");
957 printf_filtered (" source language %s.\n",
958 language_str (s
->language
));
961 /* Address of the argument list for this frame, or 0. */
962 CORE_ADDR arg_list
= get_frame_args_address (fi
);
963 /* Number of args for this frame, or -1 if unknown. */
967 printf_filtered (" Arglist at unknown address.\n");
970 printf_filtered (" Arglist at ");
971 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
972 printf_filtered (",");
974 if (!FRAME_NUM_ARGS_P ())
977 puts_filtered (" args: ");
981 numargs
= FRAME_NUM_ARGS (fi
);
982 gdb_assert (numargs
>= 0);
984 puts_filtered (" no args.");
985 else if (numargs
== 1)
986 puts_filtered (" 1 arg: ");
988 printf_filtered (" %d args: ", numargs
);
990 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
991 puts_filtered ("\n");
995 /* Address of the local variables for this frame, or 0. */
996 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
999 printf_filtered (" Locals at unknown address,");
1002 printf_filtered (" Locals at ");
1003 deprecated_print_address_numeric (arg_list
, 1, gdb_stdout
);
1004 printf_filtered (",");
1008 /* Print as much information as possible on the location of all the
1011 enum lval_type lval
;
1019 /* The sp is special; what's displayed isn't the save address, but
1020 the value of the previous frame's sp. This is a legacy thing,
1021 at one stage the frame cached the previous frame's SP instead
1022 of its address, hence it was easiest to just display the cached
1026 /* Find out the location of the saved stack pointer with out
1027 actually evaluating it. */
1028 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1030 if (!optimized
&& lval
== not_lval
)
1032 gdb_byte value
[MAX_REGISTER_SIZE
];
1034 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1036 /* NOTE: cagney/2003-05-22: This is assuming that the
1037 stack pointer was packed as an unsigned integer. That
1038 may or may not be valid. */
1039 sp
= extract_unsigned_integer (value
, register_size (current_gdbarch
, SP_REGNUM
));
1040 printf_filtered (" Previous frame's sp is ");
1041 deprecated_print_address_numeric (sp
, 1, gdb_stdout
);
1042 printf_filtered ("\n");
1045 else if (!optimized
&& lval
== lval_memory
)
1047 printf_filtered (" Previous frame's sp at ");
1048 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1049 printf_filtered ("\n");
1052 else if (!optimized
&& lval
== lval_register
)
1054 printf_filtered (" Previous frame's sp in %s\n",
1055 REGISTER_NAME (realnum
));
1058 /* else keep quiet. */
1062 numregs
= NUM_REGS
+ NUM_PSEUDO_REGS
;
1063 for (i
= 0; i
< numregs
; i
++)
1065 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1067 /* Find out the location of the saved register without
1068 fetching the corresponding value. */
1069 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1071 /* For moment, only display registers that were saved on the
1073 if (!optimized
&& lval
== lval_memory
)
1076 puts_filtered (" Saved registers:\n ");
1078 puts_filtered (",");
1080 printf_filtered (" %s at ", REGISTER_NAME (i
));
1081 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1085 if (count
|| need_nl
)
1086 puts_filtered ("\n");
1090 /* Print briefly all stack frames or just the innermost COUNT_EXP
1094 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1096 struct frame_info
*fi
;
1099 struct frame_info
*trailing
;
1102 if (!target_has_stack
)
1103 error (_("No stack."));
1105 /* The following code must do two things. First, it must set the
1106 variable TRAILING to the frame from which we should start
1107 printing. Second, it must set the variable count to the number
1108 of frames which we should print, or -1 if all of them. */
1109 trailing
= get_current_frame ();
1111 /* The target can be in a state where there is no valid frames
1112 (e.g., just connected). */
1113 if (trailing
== NULL
)
1114 error (_("No stack."));
1119 count
= parse_and_eval_long (count_exp
);
1122 struct frame_info
*current
;
1127 while (current
&& count
--)
1130 current
= get_prev_frame (current
);
1133 /* Will stop when CURRENT reaches the top of the stack.
1134 TRAILING will be COUNT below it. */
1138 trailing
= get_prev_frame (trailing
);
1139 current
= get_prev_frame (current
);
1151 struct partial_symtab
*ps
;
1153 /* Read in symbols for all of the frames. Need to do this in a
1154 separate pass so that "Reading in symbols for xxx" messages
1155 don't screw up the appearance of the backtrace. Also if
1156 people have strong opinions against reading symbols for
1157 backtrace this may have to be an option. */
1159 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1162 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1164 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1168 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1172 /* Don't use print_stack_frame; if an error() occurs it probably
1173 means further attempts to backtrace would fail (on the other
1174 hand, perhaps the code does or could be fixed to make sure
1175 the frame->prev field gets set to NULL in that case). */
1176 print_frame_info (fi
, 1, LOCATION
, 1);
1178 print_frame_local_vars (fi
, 1, gdb_stdout
);
1180 /* Save the last frame to check for error conditions. */
1184 /* If we've stopped before the end, mention that. */
1186 printf_filtered (_("(More stack frames follow...)\n"));
1188 /* If we've run out of frames, and the reason appears to be an error
1189 condition, print it. */
1190 if (fi
== NULL
&& trailing
!= NULL
)
1192 enum unwind_stop_reason reason
;
1194 reason
= get_frame_unwind_stop_reason (trailing
);
1195 if (reason
> UNWIND_FIRST_ERROR
)
1196 printf_filtered (_("Backtrace stopped: %s\n"),
1197 frame_stop_reason_string (reason
));
1201 struct backtrace_command_args
1208 /* Stub for catch_errors. */
1211 backtrace_command_stub (void *data
)
1213 struct backtrace_command_args
*args
= data
;
1214 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1219 backtrace_command (char *arg
, int from_tty
)
1221 struct cleanup
*old_chain
= NULL
;
1222 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1223 struct backtrace_command_args btargs
;
1230 argv
= buildargv (arg
);
1231 old_chain
= make_cleanup_freeargv (argv
);
1233 for (i
= 0; argv
[i
]; i
++)
1237 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1238 argv
[i
][j
] = tolower (argv
[i
][j
]);
1240 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1241 fulltrace_arg
= argc
;
1244 arglen
+= strlen (argv
[i
]);
1249 if (fulltrace_arg
>= 0)
1253 arg
= xmalloc (arglen
+ 1);
1254 memset (arg
, 0, arglen
+ 1);
1255 for (i
= 0; i
< (argc
+ 1); i
++)
1257 if (i
!= fulltrace_arg
)
1259 strcat (arg
, argv
[i
]);
1269 btargs
.count_exp
= arg
;
1270 btargs
.show_locals
= (fulltrace_arg
>= 0);
1271 btargs
.from_tty
= from_tty
;
1272 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1274 if (fulltrace_arg
>= 0 && arglen
> 0)
1278 do_cleanups (old_chain
);
1282 backtrace_full_command (char *arg
, int from_tty
)
1284 struct backtrace_command_args btargs
;
1285 btargs
.count_exp
= arg
;
1286 btargs
.show_locals
= 1;
1287 btargs
.from_tty
= from_tty
;
1288 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1292 /* Print the local variables of a block B active in FRAME on STREAM.
1293 Return 1 if any variables were printed; 0 otherwise. */
1296 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1297 int num_tabs
, struct ui_file
*stream
)
1299 struct dict_iterator iter
;
1301 int values_printed
= 0;
1304 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1306 switch (SYMBOL_CLASS (sym
))
1314 for (j
= 0; j
< num_tabs
; j
++)
1315 fputs_filtered ("\t", stream
);
1316 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1317 fputs_filtered (" = ", stream
);
1318 print_variable_value (sym
, frame
, stream
);
1319 fprintf_filtered (stream
, "\n");
1323 /* Ignore symbols which are not locals. */
1328 return values_printed
;
1331 /* Same, but print labels. */
1334 print_block_frame_labels (struct block
*b
, int *have_default
,
1335 struct ui_file
*stream
)
1337 struct dict_iterator iter
;
1339 int values_printed
= 0;
1341 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1343 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1349 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1351 struct symtab_and_line sal
;
1352 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1354 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1357 fprintf_filtered (stream
, " ");
1358 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1360 fprintf_filtered (stream
, " in file %s, line %d\n",
1361 sal
.symtab
->filename
, sal
.line
);
1365 return values_printed
;
1368 /* Print on STREAM all the local variables in frame FRAME, including
1369 all the blocks active in that frame at its current PC.
1371 Returns 1 if the job was done, or 0 if nothing was printed because
1372 we have no info on the function running in FRAME. */
1375 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1376 struct ui_file
*stream
)
1378 struct block
*block
= get_frame_block (frame
, 0);
1379 int values_printed
= 0;
1383 fprintf_filtered (stream
, "No symbol table info available.\n");
1389 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1391 /* After handling the function's top-level block, stop. Don't
1392 continue to its superblock, the block of per-file symbols. */
1393 if (BLOCK_FUNCTION (block
))
1395 block
= BLOCK_SUPERBLOCK (block
);
1398 if (!values_printed
)
1399 fprintf_filtered (stream
, _("No locals.\n"));
1402 /* Same, but print labels. */
1405 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1406 struct ui_file
*stream
)
1408 struct blockvector
*bl
;
1409 struct block
*block
= get_frame_block (frame
, 0);
1410 int values_printed
= 0;
1411 int index
, have_default
= 0;
1412 char *blocks_printed
;
1413 CORE_ADDR pc
= get_frame_pc (frame
);
1417 fprintf_filtered (stream
, "No symbol table info available.\n");
1421 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1422 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1423 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1427 CORE_ADDR end
= BLOCK_END (block
) - 4;
1430 if (bl
!= blockvector_for_pc (end
, &index
))
1431 error (_("blockvector blotch"));
1432 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1433 error (_("blockvector botch"));
1434 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1437 /* Don't print out blocks that have gone by. */
1438 while (index
< last_index
1439 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1442 while (index
< last_index
1443 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1445 if (blocks_printed
[index
] == 0)
1447 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1448 &have_default
, stream
))
1450 blocks_printed
[index
] = 1;
1456 if (values_printed
&& this_level_only
)
1459 /* After handling the function's top-level block, stop. Don't
1460 continue to its superblock, the block of per-file symbols. */
1461 if (BLOCK_FUNCTION (block
))
1463 block
= BLOCK_SUPERBLOCK (block
);
1466 if (!values_printed
&& !this_level_only
)
1467 fprintf_filtered (stream
, _("No catches.\n"));
1471 locals_info (char *args
, int from_tty
)
1473 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1478 catch_info (char *ignore
, int from_tty
)
1480 struct symtab_and_line
*sal
;
1482 /* Check for target support for exception handling */
1483 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1486 /* Currently not handling this. Ideally, here we should
1487 interact with the C++ runtime system to find the list of
1488 active handlers, etc. */
1489 fprintf_filtered (gdb_stdout
, _("\
1490 Info catch not supported with this target/compiler combination.\n"));
1494 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1495 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1501 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1503 struct symbol
*func
= get_frame_function (frame
);
1505 struct dict_iterator iter
;
1506 struct symbol
*sym
, *sym2
;
1507 int values_printed
= 0;
1511 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1515 b
= SYMBOL_BLOCK_VALUE (func
);
1516 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1518 switch (SYMBOL_CLASS (sym
))
1524 case LOC_REGPARM_ADDR
:
1525 case LOC_BASEREG_ARG
:
1526 case LOC_COMPUTED_ARG
:
1528 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1529 fputs_filtered (" = ", stream
);
1531 /* We have to look up the symbol because arguments can have
1532 two entries (one a parameter, one a local) and the one we
1533 want is the local, which lookup_symbol will find for us.
1534 This includes gcc1 (not gcc2) on the sparc when passing a
1535 small structure and gcc2 when the argument type is float
1536 and it is passed as a double and converted to float by
1537 the prologue (in the latter case the type of the LOC_ARG
1538 symbol is double and the type of the LOC_LOCAL symbol is
1539 float). There are also LOC_ARG/LOC_REGISTER pairs which
1540 are not combined in symbol-reading. */
1542 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1543 b
, VAR_DOMAIN
, NULL
, NULL
);
1544 print_variable_value (sym2
, frame
, stream
);
1545 fprintf_filtered (stream
, "\n");
1549 /* Don't worry about things which aren't arguments. */
1554 if (!values_printed
)
1555 fprintf_filtered (stream
, _("No arguments.\n"));
1559 args_info (char *ignore
, int from_tty
)
1561 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1567 args_plus_locals_info (char *ignore
, int from_tty
)
1569 args_info (ignore
, from_tty
);
1570 locals_info (ignore
, from_tty
);
1574 /* Select frame FRAME. Also print the stack frame and show the source
1575 if this is the tui version. */
1577 select_and_print_frame (struct frame_info
*frame
)
1579 select_frame (frame
);
1581 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1584 /* Return the symbol-block in which the selected frame is executing.
1585 Can return zero under various legitimate circumstances.
1587 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1588 code address within the block returned. We use this to decide
1589 which macros are in scope. */
1592 get_selected_block (CORE_ADDR
*addr_in_block
)
1594 if (!target_has_stack
)
1597 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1600 /* Find a frame a certain number of levels away from FRAME.
1601 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1602 Positive means go to earlier frames (up); negative, the reverse.
1603 The int that contains the number of levels is counted toward
1604 zero as the frames for those levels are found.
1605 If the top or bottom frame is reached, that frame is returned,
1606 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1607 how much farther the original request asked to go. */
1610 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1612 /* Going up is simple: just call get_prev_frame enough times or
1613 until the initial frame is reached. */
1614 while (*level_offset_ptr
> 0)
1616 struct frame_info
*prev
= get_prev_frame (frame
);
1619 (*level_offset_ptr
)--;
1623 /* Going down is just as simple. */
1624 while (*level_offset_ptr
< 0)
1626 struct frame_info
*next
= get_next_frame (frame
);
1629 (*level_offset_ptr
)++;
1636 /* The "select_frame" command. With no argument this is a NOP.
1637 Select the frame at level LEVEL_EXP if it is a valid level.
1638 Otherwise, treat LEVEL_EXP as an address expression and select it.
1640 See parse_frame_specification for more info on proper frame
1644 select_frame_command (char *level_exp
, int from_tty
)
1646 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1649 /* The "frame" command. With no argument, print the selected frame
1650 briefly. With an argument, behave like select_frame and then print
1651 the selected frame. */
1654 frame_command (char *level_exp
, int from_tty
)
1656 select_frame_command (level_exp
, from_tty
);
1657 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1660 /* The XDB Compatibility command to print the current frame. */
1663 current_frame_command (char *level_exp
, int from_tty
)
1665 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1668 /* Select the frame up one or COUNT_EXP stack levels from the
1669 previously selected frame, and print it briefly. */
1672 up_silently_base (char *count_exp
)
1674 struct frame_info
*frame
;
1678 count
= parse_and_eval_long (count_exp
);
1680 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1681 if (count
!= 0 && count_exp
== NULL
)
1682 error (_("Initial frame selected; you cannot go up."));
1683 select_frame (frame
);
1687 up_silently_command (char *count_exp
, int from_tty
)
1689 up_silently_base (count_exp
);
1693 up_command (char *count_exp
, int from_tty
)
1695 up_silently_base (count_exp
);
1696 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1699 /* Select the frame down one or COUNT_EXP stack levels from the previously
1700 selected frame, and print it briefly. */
1703 down_silently_base (char *count_exp
)
1705 struct frame_info
*frame
;
1708 count
= -parse_and_eval_long (count_exp
);
1710 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1711 if (count
!= 0 && count_exp
== NULL
)
1713 /* We only do this if COUNT_EXP is not specified. That way
1714 "down" means to really go down (and let me know if that is
1715 impossible), but "down 9999" can be used to mean go all the
1716 way down without getting an error. */
1718 error (_("Bottom (innermost) frame selected; you cannot go down."));
1721 select_frame (frame
);
1725 down_silently_command (char *count_exp
, int from_tty
)
1727 down_silently_base (count_exp
);
1731 down_command (char *count_exp
, int from_tty
)
1733 down_silently_base (count_exp
);
1734 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1739 return_command (char *retval_exp
, int from_tty
)
1741 struct symbol
*thisfun
;
1742 struct value
*return_value
= NULL
;
1743 const char *query_prefix
= "";
1745 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1747 /* Compute the return value. If the computation triggers an error,
1748 let it bail. If the return type can't be handled, set
1749 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1753 struct type
*return_type
= NULL
;
1755 /* Compute the return value. Should the computation fail, this
1756 call throws an error. */
1757 return_value
= parse_and_eval (retval_exp
);
1759 /* Cast return value to the return type of the function. Should
1760 the cast fail, this call throws an error. */
1761 if (thisfun
!= NULL
)
1762 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1763 if (return_type
== NULL
)
1764 return_type
= builtin_type_int
;
1765 CHECK_TYPEDEF (return_type
);
1766 return_value
= value_cast (return_type
, return_value
);
1768 /* Make sure the value is fully evaluated. It may live in the
1769 stack frame we're about to pop. */
1770 if (value_lazy (return_value
))
1771 value_fetch_lazy (return_value
);
1773 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1774 /* If the return-type is "void", don't try to find the
1775 return-value's location. However, do still evaluate the
1776 return expression so that, even when the expression result
1777 is discarded, side effects such as "return i++" still
1779 return_value
= NULL
;
1780 /* FIXME: cagney/2004-01-17: If the architecture implements both
1781 return_value and extract_returned_value_address, should allow
1782 "return" to work - don't set return_value to NULL. */
1783 else if (!gdbarch_return_value_p (current_gdbarch
)
1784 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1785 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1787 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1788 code. Old architectures don't expect STORE_RETURN_VALUE
1789 to be called with with a small struct that needs to be
1790 stored in registers. Don't start doing it now. */
1792 A structure or union return type is not supported by this architecture.\n\
1793 If you continue, the return value that you specified will be ignored.\n";
1794 return_value
= NULL
;
1796 else if (using_struct_return (return_type
, 0))
1799 The location at which to store the function's return value is unknown.\n\
1800 If you continue, the return value that you specified will be ignored.\n";
1801 return_value
= NULL
;
1805 /* Does an interactive user really want to do this? Include
1806 information, such as how well GDB can handle the return value, in
1807 the query message. */
1811 if (thisfun
== NULL
)
1812 confirmed
= query (_("%sMake selected stack frame return now? "),
1815 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1816 SYMBOL_PRINT_NAME (thisfun
));
1818 error (_("Not confirmed"));
1821 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1822 frame in turn, should this code just go straight to the relevant
1823 frame and pop that? */
1825 /* First discard all frames inner-to the selected frame (making the
1826 selected frame current). */
1828 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1829 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1831 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1832 /* Caught in the safety net, oops! We've gone way past the
1834 error (_("Problem while popping stack frames (corrupt stack?)"));
1835 frame_pop (get_current_frame ());
1839 /* Second discard the selected frame (which is now also the current
1841 frame_pop (get_current_frame ());
1843 /* Store RETURN_VALUE in the just-returned register set. */
1844 if (return_value
!= NULL
)
1846 struct type
*return_type
= value_type (return_value
);
1847 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1849 == RETURN_VALUE_REGISTER_CONVENTION
);
1850 gdbarch_return_value (current_gdbarch
, return_type
,
1851 current_regcache
, NULL
/*read*/,
1852 value_contents (return_value
) /*write*/);
1855 /* If we are at the end of a call dummy now, pop the dummy frame
1857 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1858 frame_pop (get_current_frame ());
1860 /* If interactive, print the frame that is now current. */
1862 frame_command ("0", 1);
1864 select_frame_command ("0", 0);
1867 /* Sets the scope to input function name, provided that the function
1868 is within the current stack frame */
1870 struct function_bounds
1872 CORE_ADDR low
, high
;
1876 func_command (char *arg
, int from_tty
)
1878 struct frame_info
*frame
;
1880 struct symtabs_and_lines sals
;
1883 struct function_bounds
*func_bounds
= NULL
;
1888 frame
= parse_frame_specification ("0");
1889 sals
= decode_line_spec (arg
, 1);
1890 func_bounds
= (struct function_bounds
*) xmalloc (
1891 sizeof (struct function_bounds
) * sals
.nelts
);
1892 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1894 if (sals
.sals
[i
].pc
== 0
1895 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1896 &func_bounds
[i
].low
,
1897 &func_bounds
[i
].high
) == 0)
1899 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1905 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1906 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1907 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1911 frame
= find_relative_frame (frame
, &level
);
1914 while (!found
&& level
== 0);
1917 xfree (func_bounds
);
1920 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1921 else if (frame
!= get_selected_frame (NULL
))
1922 select_and_print_frame (frame
);
1925 /* Gets the language of the current frame. */
1928 get_frame_language (void)
1930 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1934 /* We determine the current frame language by looking up its
1935 associated symtab. To retrieve this symtab, we use the frame
1936 PC. However we cannot use the frame PC as is, because it
1937 usually points to the instruction following the "call", which
1938 is sometimes the first instruction of another function. So
1939 we rely on get_frame_address_in_block(), it provides us with
1940 a PC that is guaranteed to be inside the frame's code
1942 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1943 struct symtab
*s
= find_pc_symtab (pc
);
1949 return language_unknown
;
1953 /* Provide a prototype to silence -Wmissing-prototypes. */
1954 void _initialize_stack (void);
1957 _initialize_stack (void)
1960 backtrace_limit
= 30;
1963 add_com ("return", class_stack
, return_command
, _("\
1964 Make selected stack frame return to its caller.\n\
1965 Control remains in the debugger, but when you continue\n\
1966 execution will resume in the frame above the one now selected.\n\
1967 If an argument is given, it is an expression for the value to return."));
1969 add_com ("up", class_stack
, up_command
, _("\
1970 Select and print stack frame that called this one.\n\
1971 An argument says how many frames up to go."));
1972 add_com ("up-silently", class_support
, up_silently_command
, _("\
1973 Same as the `up' command, but does not print anything.\n\
1974 This is useful in command scripts."));
1976 add_com ("down", class_stack
, down_command
, _("\
1977 Select and print stack frame called by this one.\n\
1978 An argument says how many frames down to go."));
1979 add_com_alias ("do", "down", class_stack
, 1);
1980 add_com_alias ("dow", "down", class_stack
, 1);
1981 add_com ("down-silently", class_support
, down_silently_command
, _("\
1982 Same as the `down' command, but does not print anything.\n\
1983 This is useful in command scripts."));
1985 add_com ("frame", class_stack
, frame_command
, _("\
1986 Select and print a stack frame.\n\
1987 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1988 An argument specifies the frame to select.\n\
1989 It can be a stack frame number or the address of the frame.\n\
1990 With argument, nothing is printed if input is coming from\n\
1991 a command file or a user-defined command."));
1993 add_com_alias ("f", "frame", class_stack
, 1);
1997 add_com ("L", class_stack
, current_frame_command
,
1998 _("Print the current stack frame.\n"));
1999 add_com_alias ("V", "frame", class_stack
, 1);
2001 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2002 Select a stack frame without printing anything.\n\
2003 An argument specifies the frame to select.\n\
2004 It can be a stack frame number or the address of the frame.\n"));
2006 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2007 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2008 With a negative argument, print outermost -COUNT frames.\n\
2009 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2010 add_com_alias ("bt", "backtrace", class_stack
, 0);
2013 add_com_alias ("t", "backtrace", class_stack
, 0);
2014 add_com ("T", class_stack
, backtrace_full_command
, _("\
2015 Print backtrace of all stack frames, or innermost COUNT frames \n\
2016 and the values of the local variables.\n\
2017 With a negative argument, print outermost -COUNT frames.\n\
2018 Usage: T <count>\n"));
2021 add_com_alias ("where", "backtrace", class_alias
, 0);
2022 add_info ("stack", backtrace_command
,
2023 _("Backtrace of the stack, or innermost COUNT frames."));
2024 add_info_alias ("s", "stack", 1);
2025 add_info ("frame", frame_info
,
2026 _("All about selected stack frame, or frame at ADDR."));
2027 add_info_alias ("f", "frame", 1);
2028 add_info ("locals", locals_info
,
2029 _("Local variables of current stack frame."));
2030 add_info ("args", args_info
,
2031 _("Argument variables of current stack frame."));
2033 add_com ("l", class_info
, args_plus_locals_info
,
2034 _("Argument and local variables of current stack frame."));
2037 add_com ("func", class_stack
, func_command
, _("\
2038 Select the stack frame that contains <func>.\n\
2039 Usage: func <name>\n"));
2041 add_info ("catch", catch_info
,
2042 _("Exceptions that can be caught in the current stack frame."));
2045 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2046 "Specify maximum number of frames for \"backtrace\" to print by default."),
2048 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2049 The maximum number of frames for \"backtrace\" to print by default."));