1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
5 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., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
30 #include "expression.h"
37 #include "breakpoint.h"
44 #include "gdb_assert.h"
45 #include "dictionary.h"
46 #include "reggroups.h"
49 /* Prototypes for exported functions. */
51 void args_info (char *, int);
53 void locals_info (char *, int);
55 void (*deprecated_selected_frame_level_changed_hook
) (int);
57 void _initialize_stack (void);
59 /* Prototypes for local functions. */
61 static void down_command (char *, int);
63 static void down_silently_base (char *);
65 static void down_silently_command (char *, int);
67 static void up_command (char *, int);
69 static void up_silently_base (char *);
71 static void up_silently_command (char *, int);
73 void frame_command (char *, int);
75 static void current_frame_command (char *, int);
77 static void print_frame_arg_vars (struct frame_info
*, struct ui_file
*);
79 static void catch_info (char *, int);
81 static void args_plus_locals_info (char *, int);
83 static void print_frame_label_vars (struct frame_info
*, int,
86 static void print_frame_local_vars (struct frame_info
*, int,
89 static int print_block_frame_labels (struct block
*, int *,
92 static int print_block_frame_locals (struct block
*,
97 static void print_frame (struct frame_info
*fi
,
99 enum print_what print_what
,
101 struct symtab_and_line sal
);
103 static void backtrace_command (char *, int);
105 static void frame_info (char *, int);
107 extern int addressprint
; /* Print addresses, or stay symbolic only? */
109 /* Zero means do things normally; we are interacting directly with the
110 user. One means print the full filename and linenumber when a
111 frame is printed, and do so in a format emacs18/emacs19.22 can
112 parse. Two means print similar annotations, but in many more
113 cases and in a slightly different syntax. */
115 int annotation_level
= 0;
118 struct print_stack_frame_args
120 struct frame_info
*fi
;
122 enum print_what print_what
;
126 /* Show or print the frame arguments.
127 Pass the args the way catch_errors wants them. */
129 print_stack_frame_stub (void *args
)
131 struct print_stack_frame_args
*p
= (struct print_stack_frame_args
*) args
;
133 print_frame_info (p
->fi
, p
->print_level
, p
->print_what
, p
->print_args
);
137 /* Show or print a stack frame FI briefly. The output is format
138 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
139 relative level, function name, argument list, and file name and
140 line number. If the frame's PC is not at the beginning of the
141 source line, the actual PC is printed at the beginning. */
144 print_stack_frame (struct frame_info
*fi
, int print_level
,
145 enum print_what print_what
)
147 struct print_stack_frame_args args
;
150 args
.print_level
= print_level
;
151 args
.print_what
= print_what
;
154 catch_errors (print_stack_frame_stub
, (char *) &args
, "", RETURN_MASK_ALL
);
157 struct print_args_args
160 struct frame_info
*fi
;
161 struct ui_file
*stream
;
164 static int print_args_stub (void *);
166 /* Print nameless args on STREAM.
167 FI is the frameinfo for this frame, START is the offset
168 of the first nameless arg, and NUM is the number of nameless args to
169 print. FIRST is nonzero if this is the first argument (not just
170 the first nameless arg). */
173 print_frame_nameless_args (struct frame_info
*fi
, long start
, int num
,
174 int first
, struct ui_file
*stream
)
180 for (i
= 0; i
< num
; i
++)
183 argsaddr
= get_frame_args_address (fi
);
186 arg_value
= read_memory_integer (argsaddr
+ start
, sizeof (int));
188 fprintf_filtered (stream
, ", ");
189 fprintf_filtered (stream
, "%ld", arg_value
);
191 start
+= sizeof (int);
195 /* Print the arguments of a stack frame, given the function FUNC
196 running in that frame (as a symbol), the info on the frame,
197 and the number of args according to the stack frame (or -1 if unknown). */
199 /* References here and elsewhere to "number of args according to the
200 stack frame" appear in all cases to refer to "number of ints of args
201 according to the stack frame". At least for VAX, i386, isi. */
204 print_frame_args (struct symbol
*func
, struct frame_info
*fi
, int num
,
205 struct ui_file
*stream
)
207 struct block
*b
= NULL
;
209 struct dict_iterator iter
;
212 /* Offset of next stack argument beyond the one we have seen that is
213 at the highest offset.
214 -1 if we haven't come to a stack argument yet. */
215 long highest_offset
= -1;
217 /* Number of ints of arguments that we have printed so far. */
218 int args_printed
= 0;
219 struct cleanup
*old_chain
, *list_chain
;
220 struct ui_stream
*stb
;
222 stb
= ui_out_stream_new (uiout
);
223 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
227 b
= SYMBOL_BLOCK_VALUE (func
);
229 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
233 /* Keep track of the highest stack argument offset seen, and
234 skip over any kinds of symbols we don't care about. */
236 switch (SYMBOL_CLASS (sym
))
241 long current_offset
= SYMBOL_VALUE (sym
);
242 arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
244 /* Compute address of next argument by adding the size of
245 this argument and rounding to an int boundary. */
247 ((current_offset
+ arg_size
+ sizeof (int) - 1)
248 & ~(sizeof (int) - 1));
250 /* If this is the highest offset seen yet, set highest_offset. */
251 if (highest_offset
== -1
252 || (current_offset
> highest_offset
))
253 highest_offset
= current_offset
;
255 /* Add the number of ints we're about to print to args_printed. */
256 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
259 /* We care about types of symbols, but don't need to keep track of
260 stack offsets in them. */
262 case LOC_REGPARM_ADDR
:
264 case LOC_BASEREG_ARG
:
265 case LOC_COMPUTED_ARG
:
268 /* Other types of symbols we just skip over. */
273 /* We have to look up the symbol because arguments can have
274 two entries (one a parameter, one a local) and the one we
275 want is the local, which lookup_symbol will find for us.
276 This includes gcc1 (not gcc2) on the sparc when passing a
277 small structure and gcc2 when the argument type is float
278 and it is passed as a double and converted to float by
279 the prologue (in the latter case the type of the LOC_ARG
280 symbol is double and the type of the LOC_LOCAL symbol is
282 /* But if the parameter name is null, don't try it.
283 Null parameter names occur on the RS/6000, for traceback tables.
284 FIXME, should we even print them? */
286 if (*DEPRECATED_SYMBOL_NAME (sym
))
290 (DEPRECATED_SYMBOL_NAME (sym
),
291 b
, VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
292 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
)
294 /* There is a LOC_ARG/LOC_REGISTER pair. This means that
295 it was passed on the stack and loaded into a register,
296 or passed in a register and stored in a stack slot.
297 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER.
299 Reasons for using the LOC_ARG:
300 (1) because find_saved_registers may be slow for remote
302 (2) because registers are often re-used and stack slots
303 rarely (never?) are. Therefore using the stack slot is
304 much less likely to print garbage.
306 Reasons why we might want to use the LOC_REGISTER:
307 (1) So that the backtrace prints the same value as
308 "print foo". I see no compelling reason why this needs
309 to be the case; having the backtrace print the value which
310 was passed in, and "print foo" print the value as modified
311 within the called function, makes perfect sense to me.
313 Additional note: It might be nice if "info args" displayed
315 One more note: There is a case with sparc structure passing
316 where we need to use the LOC_REGISTER, but this is dealt with
317 by creating a single LOC_REGPARM in symbol reading. */
319 /* Leave sym (the LOC_ARG) alone. */
326 /* Print the current arg. */
328 ui_out_text (uiout
, ", ");
329 ui_out_wrap_hint (uiout
, " ");
331 annotate_arg_begin ();
333 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
334 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
335 SYMBOL_LANGUAGE (sym
), DMGL_PARAMS
| DMGL_ANSI
);
336 ui_out_field_stream (uiout
, "name", stb
);
337 annotate_arg_name_end ();
338 ui_out_text (uiout
, "=");
340 /* Avoid value_print because it will deref ref parameters. We just
341 want to print their addresses. Print ??? for args whose address
342 we do not know. We pass 2 as "recurse" to val_print because our
343 standard indentation here is 4 spaces, and val_print indents
344 2 for each recurse. */
345 val
= read_var_value (sym
, fi
);
347 annotate_arg_value (val
== NULL
? NULL
: VALUE_TYPE (val
));
351 val_print (VALUE_TYPE (val
), VALUE_CONTENTS (val
), 0,
353 stb
->stream
, 0, 0, 2, Val_no_prettyprint
);
354 ui_out_field_stream (uiout
, "value", stb
);
357 ui_out_text (uiout
, "???");
359 /* Invoke ui_out_tuple_end. */
360 do_cleanups (list_chain
);
368 /* Don't print nameless args in situations where we don't know
369 enough about the stack to find them. */
374 if (highest_offset
== -1)
375 start
= FRAME_ARGS_SKIP
;
377 start
= highest_offset
;
379 print_frame_nameless_args (fi
, start
, num
- args_printed
,
382 do_cleanups (old_chain
);
385 /* Pass the args the way catch_errors wants them. */
388 print_args_stub (void *args
)
391 struct print_args_args
*p
= (struct print_args_args
*) args
;
393 if (FRAME_NUM_ARGS_P ())
395 numargs
= FRAME_NUM_ARGS (p
->fi
);
396 gdb_assert (numargs
>= 0);
400 print_frame_args (p
->func
, p
->fi
, numargs
, p
->stream
);
404 /* Print information about a frame for frame "fi" at level "level".
405 Used in "where" output, also used to emit breakpoint or step
407 LEVEL is the level of the frame, or -1 if it is the
408 innermost frame but we don't want to print the level.
409 The meaning of the SOURCE argument is:
410 SRC_LINE: Print only source line
411 LOCATION: Print only location
412 LOC_AND_SRC: Print location and source line. */
415 print_frame_info (struct frame_info
*fi
, int print_level
,
416 enum print_what print_what
, int print_args
)
418 struct symtab_and_line sal
;
422 if (get_frame_type (fi
) == DUMMY_FRAME
423 || get_frame_type (fi
) == SIGTRAMP_FRAME
)
425 struct cleanup
*uiout_cleanup
426 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
428 annotate_frame_begin (print_level
? frame_relative_level (fi
) : 0,
431 /* Do this regardless of SOURCE because we don't have any source
432 to list for this frame. */
435 ui_out_text (uiout
, "#");
436 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
437 frame_relative_level (fi
));
439 if (ui_out_is_mi_like_p (uiout
))
441 annotate_frame_address ();
442 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
443 annotate_frame_address_end ();
446 if (get_frame_type (fi
) == DUMMY_FRAME
)
448 annotate_function_call ();
449 ui_out_field_string (uiout
, "func", "<function called from gdb>");
451 else if (get_frame_type (fi
) == SIGTRAMP_FRAME
)
453 annotate_signal_handler_caller ();
454 ui_out_field_string (uiout
, "func", "<signal handler called>");
456 ui_out_text (uiout
, "\n");
457 annotate_frame_end ();
459 do_cleanups (uiout_cleanup
);
463 /* If fi is not the innermost frame, that normally means that fi->pc
464 points to *after* the call instruction, and we want to get the
465 line containing the call, never the next line. But if the next
466 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
467 was not entered as the result of a call, and we want to get the
468 line containing fi->pc. */
469 find_frame_sal (fi
, &sal
);
471 location_print
= (print_what
== LOCATION
472 || print_what
== LOC_AND_ADDRESS
473 || print_what
== SRC_AND_LOC
);
475 if (location_print
|| !sal
.symtab
)
476 print_frame (fi
, print_level
, print_what
, print_args
, sal
);
478 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
481 set_current_source_symtab_and_line (&sal
);
483 if (source_print
&& sal
.symtab
)
485 struct symtab_and_line cursal
;
487 int mid_statement
= ((print_what
== SRC_LINE
)
488 && (get_frame_pc (fi
) != sal
.pc
));
490 if (annotation_level
)
491 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
495 if (deprecated_print_frame_info_listing_hook
)
496 deprecated_print_frame_info_listing_hook (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
499 /* We used to do this earlier, but that is clearly
500 wrong. This function is used by many different
501 parts of gdb, including normal_stop in infrun.c,
502 which uses this to print out the current PC
503 when we stepi/nexti into the middle of a source
504 line. Only the command line really wants this
505 behavior. Other UIs probably would like the
506 ability to decide for themselves if it is desired. */
507 if (addressprint
&& mid_statement
)
509 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
510 ui_out_text (uiout
, "\t");
513 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
516 /* Make sure we have at least a default source file */
517 set_default_source_symtab_and_line ();
518 cursal
= get_current_source_symtab_and_line ();
519 cursal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
520 set_current_source_symtab_and_line (&cursal
);
523 if (print_what
!= LOCATION
)
524 set_default_breakpoint (1, get_frame_pc (fi
), sal
.symtab
, sal
.line
);
526 annotate_frame_end ();
528 gdb_flush (gdb_stdout
);
532 print_frame (struct frame_info
*fi
,
534 enum print_what print_what
,
536 struct symtab_and_line sal
)
540 enum language funlang
= language_unknown
;
541 struct ui_stream
*stb
;
542 struct cleanup
*old_chain
;
543 struct cleanup
*list_chain
;
545 stb
= ui_out_stream_new (uiout
);
546 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
548 func
= find_pc_function (get_frame_address_in_block (fi
));
551 /* In certain pathological cases, the symtabs give the wrong
552 function (when we are in the first function in a file which
553 is compiled without debugging symbols, the previous function
554 is compiled with debugging symbols, and the "foo.o" symbol
555 that is supposed to tell us where the file with debugging symbols
556 ends has been truncated by ar because it is longer than 15
557 characters). This also occurs if the user uses asm() to create
558 a function but not stabs for it (in a file compiled -g).
560 So look in the minimal symbol tables as well, and if it comes
561 up with a larger address for the function use that instead.
562 I don't think this can ever cause any problems; there shouldn't
563 be any minimal symbols in the middle of a function; if this is
564 ever changed many parts of GDB will need to be changed (and we'll
565 create a find_pc_minimal_function or some such). */
567 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi
));
569 && (SYMBOL_VALUE_ADDRESS (msymbol
)
570 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
572 /* We also don't know anything about the function besides
573 its address and name. */
575 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
576 funlang
= SYMBOL_LANGUAGE (msymbol
);
580 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
581 demangled name that we already have stored in the symbol
582 table, but we stored a version with DMGL_PARAMS turned
583 on, and here we don't want to display parameters. So call
584 the demangler again, with DMGL_ANSI only. (Yes, I know
585 that printf_symbol_filtered() will again try to demangle
586 the name on the fly, but the issue is that if
587 cplus_demangle() fails here, it'll fail there too. So we
588 want to catch the failure ("demangled==NULL" case below)
589 here, while we still have our hands on the function
592 funname
= DEPRECATED_SYMBOL_NAME (func
);
593 funlang
= SYMBOL_LANGUAGE (func
);
594 if (funlang
== language_cplus
)
596 demangled
= cplus_demangle (funname
, DMGL_ANSI
);
597 if (demangled
== NULL
)
598 /* If the demangler fails, try the demangled name from
599 the symbol table. This'll have parameters, but
600 that's preferable to diplaying a mangled name. */
601 funname
= SYMBOL_PRINT_NAME (func
);
607 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi
));
610 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
611 funlang
= SYMBOL_LANGUAGE (msymbol
);
615 annotate_frame_begin (print_level
? frame_relative_level (fi
) : 0,
618 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
622 ui_out_text (uiout
, "#");
623 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
624 frame_relative_level (fi
));
627 if (get_frame_pc (fi
) != sal
.pc
629 || print_what
== LOC_AND_ADDRESS
)
631 annotate_frame_address ();
632 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
633 annotate_frame_address_end ();
634 ui_out_text (uiout
, " in ");
636 annotate_frame_function_name ();
637 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??", funlang
,
639 ui_out_field_stream (uiout
, "func", stb
);
640 ui_out_wrap_hint (uiout
, " ");
641 annotate_frame_args ();
643 ui_out_text (uiout
, " (");
646 struct print_args_args args
;
647 struct cleanup
*args_list_chain
;
650 args
.stream
= gdb_stdout
;
651 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
652 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
653 /* FIXME: args must be a list. If one argument is a string it will
654 have " that will not be properly escaped. */
655 /* Invoke ui_out_tuple_end. */
656 do_cleanups (args_list_chain
);
659 ui_out_text (uiout
, ")");
660 if (sal
.symtab
&& sal
.symtab
->filename
)
662 annotate_frame_source_begin ();
663 ui_out_wrap_hint (uiout
, " ");
664 ui_out_text (uiout
, " at ");
665 annotate_frame_source_file ();
666 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
667 annotate_frame_source_file_end ();
668 ui_out_text (uiout
, ":");
669 annotate_frame_source_line ();
670 ui_out_field_int (uiout
, "line", sal
.line
);
671 annotate_frame_source_end ();
675 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
677 char *lib
= PC_SOLIB (get_frame_pc (fi
));
680 annotate_frame_where ();
681 ui_out_wrap_hint (uiout
, " ");
682 ui_out_text (uiout
, " from ");
683 ui_out_field_string (uiout
, "from", lib
);
686 #endif /* PC_SOLIB */
688 /* do_cleanups will call ui_out_tuple_end() for us. */
689 do_cleanups (list_chain
);
690 ui_out_text (uiout
, "\n");
691 do_cleanups (old_chain
);
694 /* Show the frame info. If this is the tui, it will be shown in
695 the source display otherwise, nothing is done */
697 show_stack_frame (struct frame_info
*fi
)
702 /* Read a frame specification in whatever the appropriate format is.
703 Call error() if the specification is in any way invalid (i.e. this
704 function never returns NULL). When SEPECTED_P is non-NULL set it's
705 target to indicate that the default selected frame was used. */
707 static struct frame_info
*
708 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
709 int *selected_frame_p
)
712 struct value
*args
[4];
713 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
715 if (frame_exp
== NULL
)
720 struct cleanup
*tmp_cleanup
;
726 struct cleanup
*cleanup
;
729 /* Skip leading white space, bail of EOL. */
730 while (isspace (*frame_exp
))
735 /* Parse the argument, extract it, save it. */
739 addr_string
= savestring (frame_exp
, p
- frame_exp
);
741 cleanup
= make_cleanup (xfree
, addr_string
);
743 /* NOTE: Parse and evaluate expression, but do not use
744 functions such as parse_and_eval_long or
745 parse_and_eval_address to also extract the value.
746 Instead value_as_long and value_as_address are used.
747 This avoids problems with expressions that contain
749 if (numargs
>= ARRAY_SIZE (args
))
750 error ("Too many args in frame specification");
751 args
[numargs
++] = parse_and_eval (addr_string
);
753 do_cleanups (cleanup
);
757 /* If no args, default to the selected frame. */
760 if (selected_frame_p
!= NULL
)
761 (*selected_frame_p
) = 1;
762 return get_selected_frame (message
);
765 /* None of the remaining use the selected frame. */
766 if (selected_frame_p
!= NULL
)
767 (*selected_frame_p
) = 1;
769 /* Assume the single arg[0] is an integer, and try using that to
770 select a frame relative to current. */
773 struct frame_info
*fid
;
774 int level
= value_as_long (args
[0]);
775 fid
= find_relative_frame (get_current_frame (), &level
);
777 /* find_relative_frame was successful */
781 /* Convert each value into a corresponding address. */
784 for (i
= 0; i
< numargs
; i
++)
785 addrs
[i
] = value_as_address (args
[0]);
788 /* Assume that the single arg[0] is an address, use that to identify
789 a frame with a matching ID. Should this also accept stack/pc or
793 struct frame_id id
= frame_id_build_wild (addrs
[0]);
794 struct frame_info
*fid
;
796 /* If SETUP_ARBITRARY_FRAME is defined, then frame
797 specifications take at least 2 addresses. It is important to
798 detect this case here so that "frame 100" does not give a
799 confusing error message like "frame specification requires
800 two addresses". This of course does not solve the "frame
801 100" problem for machines on which a frame specification can
802 be made with one address. To solve that, we need a new
803 syntax for a specifying a frame by address. I think the
804 cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for two
805 args, etc.), but people might think that is too much typing,
806 so I guess *0x23,0x45 would be a possible alternative (commas
807 really should be used instead of spaces to delimit; using
808 spaces normally works in an expression). */
809 #ifdef SETUP_ARBITRARY_FRAME
810 error ("No frame %s", paddr_d (addrs
[0]));
812 /* If (s)he specifies the frame with an address, he deserves
813 what (s)he gets. Still, give the highest one that matches.
814 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
816 for (fid
= get_current_frame ();
818 fid
= get_prev_frame (fid
))
820 if (frame_id_eq (id
, get_frame_id (fid
)))
822 while (frame_id_eq (id
, frame_unwind_id (fid
)))
823 fid
= get_prev_frame (fid
);
829 /* We couldn't identify the frame as an existing frame, but
830 perhaps we can create one with a single argument. */
832 return create_new_frame (addrs
[0], 0);
833 else if (numargs
== 2)
834 return create_new_frame (addrs
[0], addrs
[1]);
836 error ("Too many args in frame specification");
840 parse_frame_specification (char *frame_exp
)
842 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
845 /* Print verbosely the selected frame or the frame at address ADDR.
846 This means absolutely all information in the frame is printed. */
849 frame_info (char *addr_exp
, int from_tty
)
851 struct frame_info
*fi
;
852 struct symtab_and_line sal
;
855 struct frame_info
*calling_frame_info
;
856 int i
, count
, numregs
;
858 enum language funlang
= language_unknown
;
859 const char *pc_regname
;
860 int selected_frame_p
;
862 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
864 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
865 is not a good name. */
867 /* OK, this is weird. The PC_REGNUM hardware register's value can
868 easily not match that of the internal value returned by
870 pc_regname
= REGISTER_NAME (PC_REGNUM
);
872 /* But then, this is weird to. Even without PC_REGNUM, an
873 architectures will often have a hardware register called "pc",
874 and that register's value, again, can easily not match
878 find_frame_sal (fi
, &sal
);
879 func
= get_frame_function (fi
);
880 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
882 s
= find_pc_symtab (get_frame_pc (fi
));
885 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
886 * the demangled name that we already have stored in
887 * the symbol table, but we stored a version with
888 * DMGL_PARAMS turned on, and here we don't want
889 * to display parameters. So call the demangler again,
890 * with DMGL_ANSI only. RT
891 * (Yes, I know that printf_symbol_filtered() will
892 * again try to demangle the name on the fly, but
893 * the issue is that if cplus_demangle() fails here,
894 * it'll fail there too. So we want to catch the failure
895 * ("demangled==NULL" case below) here, while we still
896 * have our hands on the function symbol.)
899 funname
= DEPRECATED_SYMBOL_NAME (func
);
900 funlang
= SYMBOL_LANGUAGE (func
);
901 if (funlang
== language_cplus
)
903 demangled
= cplus_demangle (funname
, DMGL_ANSI
);
904 /* If the demangler fails, try the demangled name
905 * from the symbol table. This'll have parameters,
906 * but that's preferable to diplaying a mangled name.
908 if (demangled
== NULL
)
909 funname
= SYMBOL_PRINT_NAME (func
);
914 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
917 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
918 funlang
= SYMBOL_LANGUAGE (msymbol
);
921 calling_frame_info
= get_prev_frame (fi
);
923 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
925 printf_filtered ("Stack level %d, frame at ",
926 frame_relative_level (fi
));
927 print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
928 printf_filtered (":\n");
932 printf_filtered ("Stack frame at ");
933 print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
934 printf_filtered (":\n");
936 printf_filtered (" %s = ", pc_regname
);
937 print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
942 printf_filtered (" in ");
943 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
944 DMGL_ANSI
| DMGL_PARAMS
);
948 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
949 puts_filtered ("; ");
951 printf_filtered ("saved %s ", pc_regname
);
952 print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
953 printf_filtered ("\n");
955 if (calling_frame_info
)
957 printf_filtered (" called by frame at ");
958 print_address_numeric (get_frame_base (calling_frame_info
),
961 if (get_next_frame (fi
) && calling_frame_info
)
964 if (get_next_frame (fi
))
966 printf_filtered (" caller of frame at ");
967 print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
970 if (get_next_frame (fi
) || calling_frame_info
)
971 puts_filtered ("\n");
973 printf_filtered (" source language %s.\n",
974 language_str (s
->language
));
977 /* Address of the argument list for this frame, or 0. */
978 CORE_ADDR arg_list
= get_frame_args_address (fi
);
979 /* Number of args for this frame, or -1 if unknown. */
983 printf_filtered (" Arglist at unknown address.\n");
986 printf_filtered (" Arglist at ");
987 print_address_numeric (arg_list
, 1, gdb_stdout
);
988 printf_filtered (",");
990 if (!FRAME_NUM_ARGS_P ())
993 puts_filtered (" args: ");
997 numargs
= FRAME_NUM_ARGS (fi
);
998 gdb_assert (numargs
>= 0);
1000 puts_filtered (" no args.");
1001 else if (numargs
== 1)
1002 puts_filtered (" 1 arg: ");
1004 printf_filtered (" %d args: ", numargs
);
1006 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1007 puts_filtered ("\n");
1011 /* Address of the local variables for this frame, or 0. */
1012 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1015 printf_filtered (" Locals at unknown address,");
1018 printf_filtered (" Locals at ");
1019 print_address_numeric (arg_list
, 1, gdb_stdout
);
1020 printf_filtered (",");
1024 /* Print as much information as possible on the location of all the
1027 enum lval_type lval
;
1035 /* The sp is special; what's displayed isn't the save address, but
1036 the value of the previous frame's sp. This is a legacy thing,
1037 at one stage the frame cached the previous frame's SP instead
1038 of its address, hence it was easiest to just display the cached
1042 /* Find out the location of the saved stack pointer with out
1043 actually evaluating it. */
1044 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1046 if (!optimized
&& lval
== not_lval
)
1048 char value
[MAX_REGISTER_SIZE
];
1050 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1052 /* NOTE: cagney/2003-05-22: This is assuming that the
1053 stack pointer was packed as an unsigned integer. That
1054 may or may not be valid. */
1055 sp
= extract_unsigned_integer (value
, register_size (current_gdbarch
, SP_REGNUM
));
1056 printf_filtered (" Previous frame's sp is ");
1057 print_address_numeric (sp
, 1, gdb_stdout
);
1058 printf_filtered ("\n");
1061 else if (!optimized
&& lval
== lval_memory
)
1063 printf_filtered (" Previous frame's sp at ");
1064 print_address_numeric (addr
, 1, gdb_stdout
);
1065 printf_filtered ("\n");
1068 else if (!optimized
&& lval
== lval_register
)
1070 printf_filtered (" Previous frame's sp in %s\n",
1071 REGISTER_NAME (realnum
));
1074 /* else keep quiet. */
1078 numregs
= NUM_REGS
+ NUM_PSEUDO_REGS
;
1079 for (i
= 0; i
< numregs
; i
++)
1081 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1083 /* Find out the location of the saved register without
1084 fetching the corresponding value. */
1085 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1087 /* For moment, only display registers that were saved on the
1089 if (!optimized
&& lval
== lval_memory
)
1092 puts_filtered (" Saved registers:\n ");
1094 puts_filtered (",");
1096 printf_filtered (" %s at ", REGISTER_NAME (i
));
1097 print_address_numeric (addr
, 1, gdb_stdout
);
1101 if (count
|| need_nl
)
1102 puts_filtered ("\n");
1106 /* Print briefly all stack frames or just the innermost COUNT frames. */
1108 static void backtrace_command_1 (char *count_exp
, int show_locals
,
1111 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1113 struct frame_info
*fi
;
1116 struct frame_info
*trailing
;
1119 if (!target_has_stack
)
1120 error ("No stack.");
1122 /* The following code must do two things. First, it must
1123 set the variable TRAILING to the frame from which we should start
1124 printing. Second, it must set the variable count to the number
1125 of frames which we should print, or -1 if all of them. */
1126 trailing
= get_current_frame ();
1128 /* The target can be in a state where there is no valid frames
1129 (e.g., just connected). */
1130 if (trailing
== NULL
)
1131 error ("No stack.");
1136 count
= parse_and_eval_long (count_exp
);
1139 struct frame_info
*current
;
1144 while (current
&& count
--)
1147 current
= get_prev_frame (current
);
1150 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1151 will be COUNT below it. */
1155 trailing
= get_prev_frame (trailing
);
1156 current
= get_prev_frame (current
);
1168 struct partial_symtab
*ps
;
1170 /* Read in symbols for all of the frames. Need to do this in
1171 a separate pass so that "Reading in symbols for xxx" messages
1172 don't screw up the appearance of the backtrace. Also
1173 if people have strong opinions against reading symbols for
1174 backtrace this may have to be an option. */
1178 fi
= get_prev_frame (fi
))
1181 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1183 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in */
1187 for (i
= 0, fi
= trailing
;
1189 i
++, fi
= get_prev_frame (fi
))
1193 /* Don't use print_stack_frame; if an error() occurs it probably
1194 means further attempts to backtrace would fail (on the other
1195 hand, perhaps the code does or could be fixed to make sure
1196 the frame->prev field gets set to NULL in that case). */
1197 print_frame_info (fi
, 1, LOCATION
, 1);
1199 print_frame_local_vars (fi
, 1, gdb_stdout
);
1202 /* If we've stopped before the end, mention that. */
1204 printf_filtered ("(More stack frames follow...)\n");
1208 backtrace_command (char *arg
, int from_tty
)
1210 struct cleanup
*old_chain
= (struct cleanup
*) NULL
;
1211 char **argv
= (char **) NULL
;
1212 int argIndicatingFullTrace
= (-1), totArgLen
= 0, argc
= 0;
1215 if (arg
!= (char *) NULL
)
1219 argv
= buildargv (arg
);
1220 old_chain
= make_cleanup_freeargv (argv
);
1222 for (i
= 0; (argv
[i
] != (char *) NULL
); i
++)
1226 for (j
= 0; (j
< strlen (argv
[i
])); j
++)
1227 argv
[i
][j
] = tolower (argv
[i
][j
]);
1229 if (argIndicatingFullTrace
< 0 && subset_compare (argv
[i
], "full"))
1230 argIndicatingFullTrace
= argc
;
1234 totArgLen
+= strlen (argv
[i
]);
1238 if (argIndicatingFullTrace
>= 0)
1242 argPtr
= (char *) xmalloc (totArgLen
+ 1);
1247 memset (argPtr
, 0, totArgLen
+ 1);
1248 for (i
= 0; (i
< (argc
+ 1)); i
++)
1250 if (i
!= argIndicatingFullTrace
)
1252 strcat (argPtr
, argv
[i
]);
1253 strcat (argPtr
, " ");
1259 argPtr
= (char *) NULL
;
1263 backtrace_command_1 (argPtr
, (argIndicatingFullTrace
>= 0), from_tty
);
1265 if (argIndicatingFullTrace
>= 0 && totArgLen
> 0)
1269 do_cleanups (old_chain
);
1272 static void backtrace_full_command (char *arg
, int from_tty
);
1274 backtrace_full_command (char *arg
, int from_tty
)
1276 backtrace_command_1 (arg
, 1, from_tty
);
1280 /* Print the local variables of a block B active in FRAME.
1281 Return 1 if any variables were printed; 0 otherwise. */
1284 print_block_frame_locals (struct block
*b
, struct frame_info
*fi
,
1285 int num_tabs
, struct ui_file
*stream
)
1287 struct dict_iterator iter
;
1290 int values_printed
= 0;
1292 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1294 switch (SYMBOL_CLASS (sym
))
1302 for (j
= 0; j
< num_tabs
; j
++)
1303 fputs_filtered ("\t", stream
);
1304 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1305 fputs_filtered (" = ", stream
);
1306 print_variable_value (sym
, fi
, stream
);
1307 fprintf_filtered (stream
, "\n");
1311 /* Ignore symbols which are not locals. */
1315 return values_printed
;
1318 /* Same, but print labels. */
1321 print_block_frame_labels (struct block
*b
, int *have_default
,
1322 struct ui_file
*stream
)
1324 struct dict_iterator iter
;
1326 int values_printed
= 0;
1328 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1330 if (strcmp (DEPRECATED_SYMBOL_NAME (sym
), "default") == 0)
1336 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1338 struct symtab_and_line sal
;
1339 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1341 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1344 fprintf_filtered (stream
, " ");
1345 print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1347 fprintf_filtered (stream
, " in file %s, line %d\n",
1348 sal
.symtab
->filename
, sal
.line
);
1351 return values_printed
;
1354 /* Print on STREAM all the local variables in frame FRAME,
1355 including all the blocks active in that frame
1358 Returns 1 if the job was done,
1359 or 0 if nothing was printed because we have no info
1360 on the function running in FRAME. */
1363 print_frame_local_vars (struct frame_info
*fi
, int num_tabs
,
1364 struct ui_file
*stream
)
1366 struct block
*block
= get_frame_block (fi
, 0);
1367 int values_printed
= 0;
1371 fprintf_filtered (stream
, "No symbol table info available.\n");
1377 if (print_block_frame_locals (block
, fi
, num_tabs
, stream
))
1379 /* After handling the function's top-level block, stop.
1380 Don't continue to its superblock, the block of
1381 per-file symbols. */
1382 if (BLOCK_FUNCTION (block
))
1384 block
= BLOCK_SUPERBLOCK (block
);
1387 if (!values_printed
)
1389 fprintf_filtered (stream
, "No locals.\n");
1393 /* Same, but print labels. */
1396 print_frame_label_vars (struct frame_info
*fi
, int this_level_only
,
1397 struct ui_file
*stream
)
1399 struct blockvector
*bl
;
1400 struct block
*block
= get_frame_block (fi
, 0);
1401 int values_printed
= 0;
1402 int index
, have_default
= 0;
1403 char *blocks_printed
;
1404 CORE_ADDR pc
= get_frame_pc (fi
);
1408 fprintf_filtered (stream
, "No symbol table info available.\n");
1412 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1413 blocks_printed
= (char *) alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1414 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1418 CORE_ADDR end
= BLOCK_END (block
) - 4;
1421 if (bl
!= blockvector_for_pc (end
, &index
))
1422 error ("blockvector blotch");
1423 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1424 error ("blockvector botch");
1425 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1428 /* Don't print out blocks that have gone by. */
1429 while (index
< last_index
1430 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1433 while (index
< last_index
1434 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1436 if (blocks_printed
[index
] == 0)
1438 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
), &have_default
, stream
))
1440 blocks_printed
[index
] = 1;
1446 if (values_printed
&& this_level_only
)
1449 /* After handling the function's top-level block, stop.
1450 Don't continue to its superblock, the block of
1451 per-file symbols. */
1452 if (BLOCK_FUNCTION (block
))
1454 block
= BLOCK_SUPERBLOCK (block
);
1457 if (!values_printed
&& !this_level_only
)
1459 fprintf_filtered (stream
, "No catches.\n");
1464 locals_info (char *args
, int from_tty
)
1466 print_frame_local_vars (get_selected_frame ("No frame selected."),
1471 catch_info (char *ignore
, int from_tty
)
1473 struct symtab_and_line
*sal
;
1475 /* Check for target support for exception handling */
1476 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1479 /* Currently not handling this */
1480 /* Ideally, here we should interact with the C++ runtime
1481 system to find the list of active handlers, etc. */
1482 fprintf_filtered (gdb_stdout
, "Info catch not supported with this target/compiler combination.\n");
1486 /* Assume g++ compiled code -- old v 4.16 behaviour */
1487 print_frame_label_vars (get_selected_frame ("No frame selected."),
1493 print_frame_arg_vars (struct frame_info
*fi
,
1494 struct ui_file
*stream
)
1496 struct symbol
*func
= get_frame_function (fi
);
1498 struct dict_iterator iter
;
1499 struct symbol
*sym
, *sym2
;
1500 int values_printed
= 0;
1504 fprintf_filtered (stream
, "No symbol table info available.\n");
1508 b
= SYMBOL_BLOCK_VALUE (func
);
1509 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1511 switch (SYMBOL_CLASS (sym
))
1517 case LOC_REGPARM_ADDR
:
1518 case LOC_BASEREG_ARG
:
1519 case LOC_COMPUTED_ARG
:
1521 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1522 fputs_filtered (" = ", stream
);
1524 /* We have to look up the symbol because arguments can have
1525 two entries (one a parameter, one a local) and the one we
1526 want is the local, which lookup_symbol will find for us.
1527 This includes gcc1 (not gcc2) on the sparc when passing a
1528 small structure and gcc2 when the argument type is float
1529 and it is passed as a double and converted to float by
1530 the prologue (in the latter case the type of the LOC_ARG
1531 symbol is double and the type of the LOC_LOCAL symbol is
1532 float). There are also LOC_ARG/LOC_REGISTER pairs which
1533 are not combined in symbol-reading. */
1535 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1536 b
, VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
1537 print_variable_value (sym2
, fi
, stream
);
1538 fprintf_filtered (stream
, "\n");
1542 /* Don't worry about things which aren't arguments. */
1546 if (!values_printed
)
1548 fprintf_filtered (stream
, "No arguments.\n");
1553 args_info (char *ignore
, int from_tty
)
1555 print_frame_arg_vars (get_selected_frame ("No frame selected."),
1561 args_plus_locals_info (char *ignore
, int from_tty
)
1563 args_info (ignore
, from_tty
);
1564 locals_info (ignore
, from_tty
);
1568 /* Select frame FI. Also print the stack frame and show the source if
1569 this is the tui version. */
1571 select_and_print_frame (struct frame_info
*fi
)
1575 print_stack_frame (fi
, 1, SRC_AND_LOC
);
1578 /* Return the symbol-block in which the selected frame is executing.
1579 Can return zero under various legitimate circumstances.
1581 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1582 code address within the block returned. We use this to decide
1583 which macros are in scope. */
1586 get_selected_block (CORE_ADDR
*addr_in_block
)
1588 if (!target_has_stack
)
1591 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1592 a selected/current frame? Perhaps this function is called,
1593 indirectly, by WFI in "infrun.c" where avoiding the creation of
1594 an inner most frame is very important (it slows down single
1595 step). I suspect, though that this was true in the deep dark
1596 past but is no longer the case. A mindless look at all the
1597 callers tends to support this theory. I think we should be able
1598 to assume that there is always a selcted frame. */
1599 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1601 if (!deprecated_selected_frame
)
1603 CORE_ADDR pc
= read_pc ();
1604 if (addr_in_block
!= NULL
)
1605 *addr_in_block
= pc
;
1606 return block_for_pc (pc
);
1608 return get_frame_block (deprecated_selected_frame
, addr_in_block
);
1611 /* Find a frame a certain number of levels away from FRAME.
1612 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1613 Positive means go to earlier frames (up); negative, the reverse.
1614 The int that contains the number of levels is counted toward
1615 zero as the frames for those levels are found.
1616 If the top or bottom frame is reached, that frame is returned,
1617 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1618 how much farther the original request asked to go. */
1621 find_relative_frame (struct frame_info
*frame
,
1622 int *level_offset_ptr
)
1624 struct frame_info
*prev
;
1625 struct frame_info
*frame1
;
1627 /* Going up is simple: just do get_prev_frame enough times
1628 or until initial frame is reached. */
1629 while (*level_offset_ptr
> 0)
1631 prev
= get_prev_frame (frame
);
1634 (*level_offset_ptr
)--;
1637 /* Going down is just as simple. */
1638 if (*level_offset_ptr
< 0)
1640 while (*level_offset_ptr
< 0)
1642 frame1
= get_next_frame (frame
);
1646 (*level_offset_ptr
)++;
1652 /* The "select_frame" command. With no arg, NOP.
1653 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1654 valid level. Otherwise, treat level_exp as an address expression
1655 and select it. See parse_frame_specification for more info on proper
1656 frame expressions. */
1659 select_frame_command (char *level_exp
, int from_tty
)
1661 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1664 /* The "frame" command. With no arg, print selected frame briefly.
1665 With arg, behaves like select_frame and then prints the selected
1669 frame_command (char *level_exp
, int from_tty
)
1671 select_frame_command (level_exp
, from_tty
);
1672 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1675 /* The XDB Compatibility command to print the current frame. */
1678 current_frame_command (char *level_exp
, int from_tty
)
1680 print_stack_frame (get_selected_frame ("No stack."), 1, SRC_AND_LOC
);
1683 /* Select the frame up one or COUNT stack levels
1684 from the previously selected frame, and print it briefly. */
1687 up_silently_base (char *count_exp
)
1689 struct frame_info
*fi
;
1690 int count
= 1, count1
;
1692 count
= parse_and_eval_long (count_exp
);
1695 fi
= find_relative_frame (get_selected_frame ("No stack."), &count1
);
1696 if (count1
!= 0 && count_exp
== 0)
1697 error ("Initial frame selected; you cannot go up.");
1702 up_silently_command (char *count_exp
, int from_tty
)
1704 up_silently_base (count_exp
);
1708 up_command (char *count_exp
, int from_tty
)
1710 up_silently_base (count_exp
);
1711 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1714 /* Select the frame down one or COUNT stack levels
1715 from the previously selected frame, and print it briefly. */
1718 down_silently_base (char *count_exp
)
1720 struct frame_info
*frame
;
1721 int count
= -1, count1
;
1723 count
= -parse_and_eval_long (count_exp
);
1726 frame
= find_relative_frame (get_selected_frame ("No stack."), &count1
);
1727 if (count1
!= 0 && count_exp
== 0)
1730 /* We only do this if count_exp is not specified. That way "down"
1731 means to really go down (and let me know if that is
1732 impossible), but "down 9999" can be used to mean go all the way
1733 down without getting an error. */
1735 error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
1738 select_frame (frame
);
1742 down_silently_command (char *count_exp
, int from_tty
)
1744 down_silently_base (count_exp
);
1748 down_command (char *count_exp
, int from_tty
)
1750 down_silently_base (count_exp
);
1751 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1755 return_command (char *retval_exp
, int from_tty
)
1757 struct symbol
*thisfun
;
1758 struct value
*return_value
= NULL
;
1759 const char *query_prefix
= "";
1761 thisfun
= get_frame_function (get_selected_frame ("No selected frame."));
1763 /* Compute the return value. If the computation triggers an error,
1764 let it bail. If the return type can't be handled, set
1765 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1769 struct type
*return_type
= NULL
;
1771 /* Compute the return value. Should the computation fail, this
1772 call throws an error. */
1773 return_value
= parse_and_eval (retval_exp
);
1775 /* Cast return value to the return type of the function. Should
1776 the cast fail, this call throws an error. */
1777 if (thisfun
!= NULL
)
1778 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1779 if (return_type
== NULL
)
1780 return_type
= builtin_type_int
;
1781 CHECK_TYPEDEF (return_type
);
1782 return_value
= value_cast (return_type
, return_value
);
1784 /* Make sure the value is fully evaluated. It may live in the
1785 stack frame we're about to pop. */
1786 if (VALUE_LAZY (return_value
))
1787 value_fetch_lazy (return_value
);
1789 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1790 /* If the return-type is "void", don't try to find the
1791 return-value's location. However, do still evaluate the
1792 return expression so that, even when the expression result
1793 is discarded, side effects such as "return i++" still
1795 return_value
= NULL
;
1796 /* FIXME: cagney/2004-01-17: If the architecture implements both
1797 return_value and extract_returned_value_address, should allow
1798 "return" to work - don't set return_value to NULL. */
1799 else if (!gdbarch_return_value_p (current_gdbarch
)
1800 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1801 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1803 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1804 code. Old architectures don't expect STORE_RETURN_VALUE
1805 to be called with with a small struct that needs to be
1806 stored in registers. Don't start doing it now. */
1808 A structure or union return type is not supported by this architecture.\n\
1809 If you continue, the return value that you specified will be ignored.\n";
1810 return_value
= NULL
;
1812 else if (using_struct_return (return_type
, 0))
1815 The location at which to store the function's return value is unknown.\n\
1816 If you continue, the return value that you specified will be ignored.\n";
1817 return_value
= NULL
;
1821 /* Does an interactive user really want to do this? Include
1822 information, such as how well GDB can handle the return value, in
1823 the query message. */
1827 if (thisfun
== NULL
)
1828 confirmed
= query ("%sMake selected stack frame return now? ",
1831 confirmed
= query ("%sMake %s return now? ", query_prefix
,
1832 SYMBOL_PRINT_NAME (thisfun
));
1834 error ("Not confirmed");
1837 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1838 frame in turn, should this code just go straight to the relevant
1839 frame and pop that? */
1841 /* First discard all frames inner-to the selected frame (making the
1842 selected frame current). */
1844 struct frame_id selected_id
= get_frame_id (get_selected_frame (NULL
));
1845 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1847 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1848 /* Caught in the safety net, oops! We've gone way past the
1850 error ("Problem while popping stack frames (corrupt stack?)");
1851 frame_pop (get_current_frame ());
1855 /* Second discard the selected frame (which is now also the current
1857 frame_pop (get_current_frame ());
1859 /* Store RETURN_VAUE in the just-returned register set. */
1860 if (return_value
!= NULL
)
1862 struct type
*return_type
= VALUE_TYPE (return_value
);
1863 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1865 == RETURN_VALUE_REGISTER_CONVENTION
);
1866 gdbarch_return_value (current_gdbarch
, return_type
,
1867 current_regcache
, NULL
/*read*/,
1868 VALUE_CONTENTS (return_value
) /*write*/);
1871 /* If we are at the end of a call dummy now, pop the dummy frame
1873 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1874 frame_pop (get_current_frame ());
1876 /* If interactive, print the frame that is now current. */
1878 frame_command ("0", 1);
1880 select_frame_command ("0", 0);
1883 /* Sets the scope to input function name, provided that the
1884 function is within the current stack frame */
1886 struct function_bounds
1888 CORE_ADDR low
, high
;
1891 static void func_command (char *arg
, int from_tty
);
1893 func_command (char *arg
, int from_tty
)
1895 struct frame_info
*fp
;
1897 struct symtabs_and_lines sals
;
1900 struct function_bounds
*func_bounds
= (struct function_bounds
*) NULL
;
1902 if (arg
!= (char *) NULL
)
1905 fp
= parse_frame_specification ("0");
1906 sals
= decode_line_spec (arg
, 1);
1907 func_bounds
= (struct function_bounds
*) xmalloc (
1908 sizeof (struct function_bounds
) * sals
.nelts
);
1909 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1911 if (sals
.sals
[i
].pc
== (CORE_ADDR
) 0 ||
1912 find_pc_partial_function (sals
.sals
[i
].pc
,
1914 &func_bounds
[i
].low
,
1915 &func_bounds
[i
].high
) == 0)
1917 func_bounds
[i
].low
=
1918 func_bounds
[i
].high
= (CORE_ADDR
) NULL
;
1924 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1925 found
= (get_frame_pc (fp
) >= func_bounds
[i
].low
&&
1926 get_frame_pc (fp
) < func_bounds
[i
].high
);
1930 fp
= find_relative_frame (fp
, &level
);
1933 while (!found
&& level
== 0);
1936 xfree (func_bounds
);
1939 printf_filtered ("'%s' not within current stack frame.\n", arg
);
1940 else if (fp
!= deprecated_selected_frame
)
1941 select_and_print_frame (fp
);
1944 /* Gets the language of the current frame. */
1947 get_frame_language (void)
1950 enum language flang
; /* The language of the current frame */
1952 if (deprecated_selected_frame
)
1954 /* We determine the current frame language by looking up its
1955 associated symtab. To retrieve this symtab, we use the frame PC.
1956 However we cannot use the frame pc as is, because it usually points
1957 to the instruction following the "call", which is sometimes the first
1958 instruction of another function. So we rely on
1959 get_frame_address_in_block(), it provides us with a PC which is
1960 guaranteed to be inside the frame's code block. */
1961 s
= find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame
));
1963 flang
= s
->language
;
1965 flang
= language_unknown
;
1968 flang
= language_unknown
;
1974 _initialize_stack (void)
1977 backtrace_limit
= 30;
1980 add_com ("return", class_stack
, return_command
,
1981 "Make selected stack frame return to its caller.\n\
1982 Control remains in the debugger, but when you continue\n\
1983 execution will resume in the frame above the one now selected.\n\
1984 If an argument is given, it is an expression for the value to return.");
1986 add_com ("up", class_stack
, up_command
,
1987 "Select and print stack frame that called this one.\n\
1988 An argument says how many frames up to go.");
1989 add_com ("up-silently", class_support
, up_silently_command
,
1990 "Same as the `up' command, but does not print anything.\n\
1991 This is useful in command scripts.");
1993 add_com ("down", class_stack
, down_command
,
1994 "Select and print stack frame called by this one.\n\
1995 An argument says how many frames down to go.");
1996 add_com_alias ("do", "down", class_stack
, 1);
1997 add_com_alias ("dow", "down", class_stack
, 1);
1998 add_com ("down-silently", class_support
, down_silently_command
,
1999 "Same as the `down' command, but does not print anything.\n\
2000 This is useful in command scripts.");
2002 add_com ("frame", class_stack
, frame_command
,
2003 "Select and print a stack frame.\n\
2004 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2005 An argument specifies the frame to select.\n\
2006 It can be a stack frame number or the address of the frame.\n\
2007 With argument, nothing is printed if input is coming from\n\
2008 a command file or a user-defined command.");
2010 add_com_alias ("f", "frame", class_stack
, 1);
2014 add_com ("L", class_stack
, current_frame_command
,
2015 "Print the current stack frame.\n");
2016 add_com_alias ("V", "frame", class_stack
, 1);
2018 add_com ("select-frame", class_stack
, select_frame_command
,
2019 "Select a stack frame without printing anything.\n\
2020 An argument specifies the frame to select.\n\
2021 It can be a stack frame number or the address of the frame.\n");
2023 add_com ("backtrace", class_stack
, backtrace_command
,
2024 "Print backtrace of all stack frames, or innermost COUNT frames.\n\
2025 With a negative argument, print outermost -COUNT frames.\n\
2026 Use of the 'full' qualifier also prints the values of the local variables.\n");
2027 add_com_alias ("bt", "backtrace", class_stack
, 0);
2030 add_com_alias ("t", "backtrace", class_stack
, 0);
2031 add_com ("T", class_stack
, backtrace_full_command
,
2032 "Print backtrace of all stack frames, or innermost COUNT frames \n\
2033 and the values of the local variables.\n\
2034 With a negative argument, print outermost -COUNT frames.\n\
2035 Usage: T <count>\n");
2038 add_com_alias ("where", "backtrace", class_alias
, 0);
2039 add_info ("stack", backtrace_command
,
2040 "Backtrace of the stack, or innermost COUNT frames.");
2041 add_info_alias ("s", "stack", 1);
2042 add_info ("frame", frame_info
,
2043 "All about selected stack frame, or frame at ADDR.");
2044 add_info_alias ("f", "frame", 1);
2045 add_info ("locals", locals_info
,
2046 "Local variables of current stack frame.");
2047 add_info ("args", args_info
,
2048 "Argument variables of current stack frame.");
2050 add_com ("l", class_info
, args_plus_locals_info
,
2051 "Argument and local variables of current stack frame.");
2054 add_com ("func", class_stack
, func_command
,
2055 "Select the stack frame that contains <func>.\nUsage: func <name>\n");
2057 add_info ("catch", catch_info
,
2058 "Exceptions that can be caught in the current stack frame.");
2061 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
,
2062 "Specify maximum number of frames for \"backtrace\" to print by default.",
2064 add_info ("backtrace-limit", backtrace_limit_info
,
2065 "The maximum number of frames for \"backtrace\" to print by default.");