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. */
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 (!gdbarch_frame_num_args_p (current_gdbarch
))
977 puts_filtered (" args: ");
981 numargs
= gdbarch_frame_num_args (current_gdbarch
, 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
= gdbarch_num_regs (current_gdbarch
)
1063 + gdbarch_num_pseudo_regs (current_gdbarch
);
1064 for (i
= 0; i
< numregs
; i
++)
1066 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1068 /* Find out the location of the saved register without
1069 fetching the corresponding value. */
1070 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1072 /* For moment, only display registers that were saved on the
1074 if (!optimized
&& lval
== lval_memory
)
1077 puts_filtered (" Saved registers:\n ");
1079 puts_filtered (",");
1081 printf_filtered (" %s at ", REGISTER_NAME (i
));
1082 deprecated_print_address_numeric (addr
, 1, gdb_stdout
);
1086 if (count
|| need_nl
)
1087 puts_filtered ("\n");
1091 /* Print briefly all stack frames or just the innermost COUNT_EXP
1095 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1097 struct frame_info
*fi
;
1100 struct frame_info
*trailing
;
1103 if (!target_has_stack
)
1104 error (_("No stack."));
1106 /* The following code must do two things. First, it must set the
1107 variable TRAILING to the frame from which we should start
1108 printing. Second, it must set the variable count to the number
1109 of frames which we should print, or -1 if all of them. */
1110 trailing
= get_current_frame ();
1112 /* The target can be in a state where there is no valid frames
1113 (e.g., just connected). */
1114 if (trailing
== NULL
)
1115 error (_("No stack."));
1120 count
= parse_and_eval_long (count_exp
);
1123 struct frame_info
*current
;
1128 while (current
&& count
--)
1131 current
= get_prev_frame (current
);
1134 /* Will stop when CURRENT reaches the top of the stack.
1135 TRAILING will be COUNT below it. */
1139 trailing
= get_prev_frame (trailing
);
1140 current
= get_prev_frame (current
);
1152 struct partial_symtab
*ps
;
1154 /* Read in symbols for all of the frames. Need to do this in a
1155 separate pass so that "Reading in symbols for xxx" messages
1156 don't screw up the appearance of the backtrace. Also if
1157 people have strong opinions against reading symbols for
1158 backtrace this may have to be an option. */
1160 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1163 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1165 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1169 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1173 /* Don't use print_stack_frame; if an error() occurs it probably
1174 means further attempts to backtrace would fail (on the other
1175 hand, perhaps the code does or could be fixed to make sure
1176 the frame->prev field gets set to NULL in that case). */
1177 print_frame_info (fi
, 1, LOCATION
, 1);
1179 print_frame_local_vars (fi
, 1, gdb_stdout
);
1181 /* Save the last frame to check for error conditions. */
1185 /* If we've stopped before the end, mention that. */
1187 printf_filtered (_("(More stack frames follow...)\n"));
1189 /* If we've run out of frames, and the reason appears to be an error
1190 condition, print it. */
1191 if (fi
== NULL
&& trailing
!= NULL
)
1193 enum unwind_stop_reason reason
;
1195 reason
= get_frame_unwind_stop_reason (trailing
);
1196 if (reason
> UNWIND_FIRST_ERROR
)
1197 printf_filtered (_("Backtrace stopped: %s\n"),
1198 frame_stop_reason_string (reason
));
1202 struct backtrace_command_args
1209 /* Stub for catch_errors. */
1212 backtrace_command_stub (void *data
)
1214 struct backtrace_command_args
*args
= data
;
1215 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1220 backtrace_command (char *arg
, int from_tty
)
1222 struct cleanup
*old_chain
= NULL
;
1223 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1224 struct backtrace_command_args btargs
;
1231 argv
= buildargv (arg
);
1232 old_chain
= make_cleanup_freeargv (argv
);
1234 for (i
= 0; argv
[i
]; i
++)
1238 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1239 argv
[i
][j
] = tolower (argv
[i
][j
]);
1241 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1242 fulltrace_arg
= argc
;
1245 arglen
+= strlen (argv
[i
]);
1250 if (fulltrace_arg
>= 0)
1254 arg
= xmalloc (arglen
+ 1);
1255 memset (arg
, 0, arglen
+ 1);
1256 for (i
= 0; i
< (argc
+ 1); i
++)
1258 if (i
!= fulltrace_arg
)
1260 strcat (arg
, argv
[i
]);
1270 btargs
.count_exp
= arg
;
1271 btargs
.show_locals
= (fulltrace_arg
>= 0);
1272 btargs
.from_tty
= from_tty
;
1273 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1275 if (fulltrace_arg
>= 0 && arglen
> 0)
1279 do_cleanups (old_chain
);
1283 backtrace_full_command (char *arg
, int from_tty
)
1285 struct backtrace_command_args btargs
;
1286 btargs
.count_exp
= arg
;
1287 btargs
.show_locals
= 1;
1288 btargs
.from_tty
= from_tty
;
1289 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1293 /* Print the local variables of a block B active in FRAME on STREAM.
1294 Return 1 if any variables were printed; 0 otherwise. */
1297 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1298 int num_tabs
, struct ui_file
*stream
)
1300 struct dict_iterator iter
;
1302 int values_printed
= 0;
1305 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1307 switch (SYMBOL_CLASS (sym
))
1315 for (j
= 0; j
< num_tabs
; j
++)
1316 fputs_filtered ("\t", stream
);
1317 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1318 fputs_filtered (" = ", stream
);
1319 print_variable_value (sym
, frame
, stream
);
1320 fprintf_filtered (stream
, "\n");
1324 /* Ignore symbols which are not locals. */
1329 return values_printed
;
1332 /* Same, but print labels. */
1335 print_block_frame_labels (struct block
*b
, int *have_default
,
1336 struct ui_file
*stream
)
1338 struct dict_iterator iter
;
1340 int values_printed
= 0;
1342 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1344 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1350 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1352 struct symtab_and_line sal
;
1353 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1355 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1358 fprintf_filtered (stream
, " ");
1359 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1361 fprintf_filtered (stream
, " in file %s, line %d\n",
1362 sal
.symtab
->filename
, sal
.line
);
1366 return values_printed
;
1369 /* Print on STREAM all the local variables in frame FRAME, including
1370 all the blocks active in that frame at its current PC.
1372 Returns 1 if the job was done, or 0 if nothing was printed because
1373 we have no info on the function running in FRAME. */
1376 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1377 struct ui_file
*stream
)
1379 struct block
*block
= get_frame_block (frame
, 0);
1380 int values_printed
= 0;
1384 fprintf_filtered (stream
, "No symbol table info available.\n");
1390 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1392 /* After handling the function's top-level block, stop. Don't
1393 continue to its superblock, the block of per-file symbols. */
1394 if (BLOCK_FUNCTION (block
))
1396 block
= BLOCK_SUPERBLOCK (block
);
1399 if (!values_printed
)
1400 fprintf_filtered (stream
, _("No locals.\n"));
1403 /* Same, but print labels. */
1406 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1407 struct ui_file
*stream
)
1409 struct blockvector
*bl
;
1410 struct block
*block
= get_frame_block (frame
, 0);
1411 int values_printed
= 0;
1412 int index
, have_default
= 0;
1413 char *blocks_printed
;
1414 CORE_ADDR pc
= get_frame_pc (frame
);
1418 fprintf_filtered (stream
, "No symbol table info available.\n");
1422 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1423 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1424 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1428 CORE_ADDR end
= BLOCK_END (block
) - 4;
1431 if (bl
!= blockvector_for_pc (end
, &index
))
1432 error (_("blockvector blotch"));
1433 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1434 error (_("blockvector botch"));
1435 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1438 /* Don't print out blocks that have gone by. */
1439 while (index
< last_index
1440 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1443 while (index
< last_index
1444 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1446 if (blocks_printed
[index
] == 0)
1448 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1449 &have_default
, stream
))
1451 blocks_printed
[index
] = 1;
1457 if (values_printed
&& this_level_only
)
1460 /* After handling the function's top-level block, stop. Don't
1461 continue to its superblock, the block of per-file symbols. */
1462 if (BLOCK_FUNCTION (block
))
1464 block
= BLOCK_SUPERBLOCK (block
);
1467 if (!values_printed
&& !this_level_only
)
1468 fprintf_filtered (stream
, _("No catches.\n"));
1472 locals_info (char *args
, int from_tty
)
1474 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1479 catch_info (char *ignore
, int from_tty
)
1481 struct symtab_and_line
*sal
;
1483 /* Check for target support for exception handling */
1484 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1487 /* Currently not handling this. Ideally, here we should
1488 interact with the C++ runtime system to find the list of
1489 active handlers, etc. */
1490 fprintf_filtered (gdb_stdout
, _("\
1491 Info catch not supported with this target/compiler combination.\n"));
1495 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1496 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1502 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1504 struct symbol
*func
= get_frame_function (frame
);
1506 struct dict_iterator iter
;
1507 struct symbol
*sym
, *sym2
;
1508 int values_printed
= 0;
1512 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1516 b
= SYMBOL_BLOCK_VALUE (func
);
1517 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1519 switch (SYMBOL_CLASS (sym
))
1525 case LOC_REGPARM_ADDR
:
1526 case LOC_BASEREG_ARG
:
1527 case LOC_COMPUTED_ARG
:
1529 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1530 fputs_filtered (" = ", stream
);
1532 /* We have to look up the symbol because arguments can have
1533 two entries (one a parameter, one a local) and the one we
1534 want is the local, which lookup_symbol will find for us.
1535 This includes gcc1 (not gcc2) on the sparc when passing a
1536 small structure and gcc2 when the argument type is float
1537 and it is passed as a double and converted to float by
1538 the prologue (in the latter case the type of the LOC_ARG
1539 symbol is double and the type of the LOC_LOCAL symbol is
1540 float). There are also LOC_ARG/LOC_REGISTER pairs which
1541 are not combined in symbol-reading. */
1543 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1544 b
, VAR_DOMAIN
, NULL
, NULL
);
1545 print_variable_value (sym2
, frame
, stream
);
1546 fprintf_filtered (stream
, "\n");
1550 /* Don't worry about things which aren't arguments. */
1555 if (!values_printed
)
1556 fprintf_filtered (stream
, _("No arguments.\n"));
1560 args_info (char *ignore
, int from_tty
)
1562 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1568 args_plus_locals_info (char *ignore
, int from_tty
)
1570 args_info (ignore
, from_tty
);
1571 locals_info (ignore
, from_tty
);
1575 /* Select frame FRAME. Also print the stack frame and show the source
1576 if this is the tui version. */
1578 select_and_print_frame (struct frame_info
*frame
)
1580 select_frame (frame
);
1582 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1585 /* Return the symbol-block in which the selected frame is executing.
1586 Can return zero under various legitimate circumstances.
1588 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1589 code address within the block returned. We use this to decide
1590 which macros are in scope. */
1593 get_selected_block (CORE_ADDR
*addr_in_block
)
1595 if (!target_has_stack
)
1598 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1601 /* Find a frame a certain number of levels away from FRAME.
1602 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1603 Positive means go to earlier frames (up); negative, the reverse.
1604 The int that contains the number of levels is counted toward
1605 zero as the frames for those levels are found.
1606 If the top or bottom frame is reached, that frame is returned,
1607 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1608 how much farther the original request asked to go. */
1611 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1613 /* Going up is simple: just call get_prev_frame enough times or
1614 until the initial frame is reached. */
1615 while (*level_offset_ptr
> 0)
1617 struct frame_info
*prev
= get_prev_frame (frame
);
1620 (*level_offset_ptr
)--;
1624 /* Going down is just as simple. */
1625 while (*level_offset_ptr
< 0)
1627 struct frame_info
*next
= get_next_frame (frame
);
1630 (*level_offset_ptr
)++;
1637 /* The "select_frame" command. With no argument this is a NOP.
1638 Select the frame at level LEVEL_EXP if it is a valid level.
1639 Otherwise, treat LEVEL_EXP as an address expression and select it.
1641 See parse_frame_specification for more info on proper frame
1645 select_frame_command (char *level_exp
, int from_tty
)
1647 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1650 /* The "frame" command. With no argument, print the selected frame
1651 briefly. With an argument, behave like select_frame and then print
1652 the selected frame. */
1655 frame_command (char *level_exp
, int from_tty
)
1657 select_frame_command (level_exp
, from_tty
);
1658 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1661 /* The XDB Compatibility command to print the current frame. */
1664 current_frame_command (char *level_exp
, int from_tty
)
1666 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1669 /* Select the frame up one or COUNT_EXP stack levels from the
1670 previously selected frame, and print it briefly. */
1673 up_silently_base (char *count_exp
)
1675 struct frame_info
*frame
;
1679 count
= parse_and_eval_long (count_exp
);
1681 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1682 if (count
!= 0 && count_exp
== NULL
)
1683 error (_("Initial frame selected; you cannot go up."));
1684 select_frame (frame
);
1688 up_silently_command (char *count_exp
, int from_tty
)
1690 up_silently_base (count_exp
);
1694 up_command (char *count_exp
, int from_tty
)
1696 up_silently_base (count_exp
);
1697 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1700 /* Select the frame down one or COUNT_EXP stack levels from the previously
1701 selected frame, and print it briefly. */
1704 down_silently_base (char *count_exp
)
1706 struct frame_info
*frame
;
1709 count
= -parse_and_eval_long (count_exp
);
1711 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1712 if (count
!= 0 && count_exp
== NULL
)
1714 /* We only do this if COUNT_EXP is not specified. That way
1715 "down" means to really go down (and let me know if that is
1716 impossible), but "down 9999" can be used to mean go all the
1717 way down without getting an error. */
1719 error (_("Bottom (innermost) frame selected; you cannot go down."));
1722 select_frame (frame
);
1726 down_silently_command (char *count_exp
, int from_tty
)
1728 down_silently_base (count_exp
);
1732 down_command (char *count_exp
, int from_tty
)
1734 down_silently_base (count_exp
);
1735 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1740 return_command (char *retval_exp
, int from_tty
)
1742 struct symbol
*thisfun
;
1743 struct value
*return_value
= NULL
;
1744 const char *query_prefix
= "";
1746 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1748 /* Compute the return value. If the computation triggers an error,
1749 let it bail. If the return type can't be handled, set
1750 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1754 struct type
*return_type
= NULL
;
1756 /* Compute the return value. Should the computation fail, this
1757 call throws an error. */
1758 return_value
= parse_and_eval (retval_exp
);
1760 /* Cast return value to the return type of the function. Should
1761 the cast fail, this call throws an error. */
1762 if (thisfun
!= NULL
)
1763 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1764 if (return_type
== NULL
)
1765 return_type
= builtin_type_int
;
1766 CHECK_TYPEDEF (return_type
);
1767 return_value
= value_cast (return_type
, return_value
);
1769 /* Make sure the value is fully evaluated. It may live in the
1770 stack frame we're about to pop. */
1771 if (value_lazy (return_value
))
1772 value_fetch_lazy (return_value
);
1774 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1775 /* If the return-type is "void", don't try to find the
1776 return-value's location. However, do still evaluate the
1777 return expression so that, even when the expression result
1778 is discarded, side effects such as "return i++" still
1780 return_value
= NULL
;
1781 /* FIXME: cagney/2004-01-17: If the architecture implements both
1782 return_value and extract_returned_value_address, should allow
1783 "return" to work - don't set return_value to NULL. */
1784 else if (!gdbarch_return_value_p (current_gdbarch
)
1785 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1786 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1788 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1789 code. Old architectures don't expect STORE_RETURN_VALUE
1790 to be called with with a small struct that needs to be
1791 stored in registers. Don't start doing it now. */
1793 A structure or union return type is not supported by this architecture.\n\
1794 If you continue, the return value that you specified will be ignored.\n";
1795 return_value
= NULL
;
1797 else if (using_struct_return (return_type
, 0))
1800 The location at which to store the function's return value is unknown.\n\
1801 If you continue, the return value that you specified will be ignored.\n";
1802 return_value
= NULL
;
1806 /* Does an interactive user really want to do this? Include
1807 information, such as how well GDB can handle the return value, in
1808 the query message. */
1812 if (thisfun
== NULL
)
1813 confirmed
= query (_("%sMake selected stack frame return now? "),
1816 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1817 SYMBOL_PRINT_NAME (thisfun
));
1819 error (_("Not confirmed"));
1822 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1823 frame in turn, should this code just go straight to the relevant
1824 frame and pop that? */
1826 /* First discard all frames inner-to the selected frame (making the
1827 selected frame current). */
1829 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1830 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1832 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1833 /* Caught in the safety net, oops! We've gone way past the
1835 error (_("Problem while popping stack frames (corrupt stack?)"));
1836 frame_pop (get_current_frame ());
1840 /* Second discard the selected frame (which is now also the current
1842 frame_pop (get_current_frame ());
1844 /* Store RETURN_VALUE in the just-returned register set. */
1845 if (return_value
!= NULL
)
1847 struct type
*return_type
= value_type (return_value
);
1848 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1850 == RETURN_VALUE_REGISTER_CONVENTION
);
1851 gdbarch_return_value (current_gdbarch
, return_type
,
1852 current_regcache
, NULL
/*read*/,
1853 value_contents (return_value
) /*write*/);
1856 /* If we are at the end of a call dummy now, pop the dummy frame
1858 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1859 frame_pop (get_current_frame ());
1861 /* If interactive, print the frame that is now current. */
1863 frame_command ("0", 1);
1865 select_frame_command ("0", 0);
1868 /* Sets the scope to input function name, provided that the function
1869 is within the current stack frame */
1871 struct function_bounds
1873 CORE_ADDR low
, high
;
1877 func_command (char *arg
, int from_tty
)
1879 struct frame_info
*frame
;
1881 struct symtabs_and_lines sals
;
1884 struct function_bounds
*func_bounds
= NULL
;
1889 frame
= parse_frame_specification ("0");
1890 sals
= decode_line_spec (arg
, 1);
1891 func_bounds
= (struct function_bounds
*) xmalloc (
1892 sizeof (struct function_bounds
) * sals
.nelts
);
1893 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1895 if (sals
.sals
[i
].pc
== 0
1896 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
1897 &func_bounds
[i
].low
,
1898 &func_bounds
[i
].high
) == 0)
1900 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
1906 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1907 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
1908 && get_frame_pc (frame
) < func_bounds
[i
].high
);
1912 frame
= find_relative_frame (frame
, &level
);
1915 while (!found
&& level
== 0);
1918 xfree (func_bounds
);
1921 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
1922 else if (frame
!= get_selected_frame (NULL
))
1923 select_and_print_frame (frame
);
1926 /* Gets the language of the current frame. */
1929 get_frame_language (void)
1931 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
1935 /* We determine the current frame language by looking up its
1936 associated symtab. To retrieve this symtab, we use the frame
1937 PC. However we cannot use the frame PC as is, because it
1938 usually points to the instruction following the "call", which
1939 is sometimes the first instruction of another function. So
1940 we rely on get_frame_address_in_block(), it provides us with
1941 a PC that is guaranteed to be inside the frame's code
1943 CORE_ADDR pc
= get_frame_address_in_block (frame
);
1944 struct symtab
*s
= find_pc_symtab (pc
);
1950 return language_unknown
;
1954 /* Provide a prototype to silence -Wmissing-prototypes. */
1955 void _initialize_stack (void);
1958 _initialize_stack (void)
1961 backtrace_limit
= 30;
1964 add_com ("return", class_stack
, return_command
, _("\
1965 Make selected stack frame return to its caller.\n\
1966 Control remains in the debugger, but when you continue\n\
1967 execution will resume in the frame above the one now selected.\n\
1968 If an argument is given, it is an expression for the value to return."));
1970 add_com ("up", class_stack
, up_command
, _("\
1971 Select and print stack frame that called this one.\n\
1972 An argument says how many frames up to go."));
1973 add_com ("up-silently", class_support
, up_silently_command
, _("\
1974 Same as the `up' command, but does not print anything.\n\
1975 This is useful in command scripts."));
1977 add_com ("down", class_stack
, down_command
, _("\
1978 Select and print stack frame called by this one.\n\
1979 An argument says how many frames down to go."));
1980 add_com_alias ("do", "down", class_stack
, 1);
1981 add_com_alias ("dow", "down", class_stack
, 1);
1982 add_com ("down-silently", class_support
, down_silently_command
, _("\
1983 Same as the `down' command, but does not print anything.\n\
1984 This is useful in command scripts."));
1986 add_com ("frame", class_stack
, frame_command
, _("\
1987 Select and print a stack frame.\n\
1988 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1989 An argument specifies the frame to select.\n\
1990 It can be a stack frame number or the address of the frame.\n\
1991 With argument, nothing is printed if input is coming from\n\
1992 a command file or a user-defined command."));
1994 add_com_alias ("f", "frame", class_stack
, 1);
1998 add_com ("L", class_stack
, current_frame_command
,
1999 _("Print the current stack frame.\n"));
2000 add_com_alias ("V", "frame", class_stack
, 1);
2002 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2003 Select a stack frame without printing anything.\n\
2004 An argument specifies the frame to select.\n\
2005 It can be a stack frame number or the address of the frame.\n"));
2007 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2008 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2009 With a negative argument, print outermost -COUNT frames.\n\
2010 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2011 add_com_alias ("bt", "backtrace", class_stack
, 0);
2014 add_com_alias ("t", "backtrace", class_stack
, 0);
2015 add_com ("T", class_stack
, backtrace_full_command
, _("\
2016 Print backtrace of all stack frames, or innermost COUNT frames \n\
2017 and the values of the local variables.\n\
2018 With a negative argument, print outermost -COUNT frames.\n\
2019 Usage: T <count>\n"));
2022 add_com_alias ("where", "backtrace", class_alias
, 0);
2023 add_info ("stack", backtrace_command
,
2024 _("Backtrace of the stack, or innermost COUNT frames."));
2025 add_info_alias ("s", "stack", 1);
2026 add_info ("frame", frame_info
,
2027 _("All about selected stack frame, or frame at ADDR."));
2028 add_info_alias ("f", "frame", 1);
2029 add_info ("locals", locals_info
,
2030 _("Local variables of current stack frame."));
2031 add_info ("args", args_info
,
2032 _("Argument variables of current stack frame."));
2034 add_com ("l", class_info
, args_plus_locals_info
,
2035 _("Argument and local variables of current stack frame."));
2038 add_com ("func", class_stack
, func_command
, _("\
2039 Select the stack frame that contains <func>.\n\
2040 Usage: func <name>\n"));
2042 add_info ("catch", catch_info
,
2043 _("Exceptions that can be caught in the current stack frame."));
2046 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2047 "Specify maximum number of frames for \"backtrace\" to print by default."),
2049 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2050 The maximum number of frames for \"backtrace\" to print by default."));