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 struct frame_info
*parse_frame_specification (char *);
107 static void frame_info (char *, int);
109 extern int addressprint
; /* Print addresses, or stay symbolic only? */
111 /* Zero means do things normally; we are interacting directly with the
112 user. One means print the full filename and linenumber when a
113 frame is printed, and do so in a format emacs18/emacs19.22 can
114 parse. Two means print similar annotations, but in many more
115 cases and in a slightly different syntax. */
117 int annotation_level
= 0;
120 struct print_stack_frame_args
122 struct frame_info
*fi
;
124 enum print_what print_what
;
128 /* Show or print the frame arguments.
129 Pass the args the way catch_errors wants them. */
131 print_stack_frame_stub (void *args
)
133 struct print_stack_frame_args
*p
= (struct print_stack_frame_args
*) args
;
135 print_frame_info (p
->fi
, p
->print_level
, p
->print_what
, p
->print_args
);
139 /* Show or print a stack frame FI briefly. The output is format
140 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
141 relative level, function name, argument list, and file name and
142 line number. If the frame's PC is not at the beginning of the
143 source line, the actual PC is printed at the beginning. */
146 print_stack_frame (struct frame_info
*fi
, int print_level
,
147 enum print_what print_what
)
149 struct print_stack_frame_args args
;
152 args
.print_level
= print_level
;
153 args
.print_what
= print_what
;
156 catch_errors (print_stack_frame_stub
, (char *) &args
, "", RETURN_MASK_ALL
);
159 struct print_args_args
162 struct frame_info
*fi
;
163 struct ui_file
*stream
;
166 static int print_args_stub (void *);
168 /* Print nameless args on STREAM.
169 FI is the frameinfo for this frame, START is the offset
170 of the first nameless arg, and NUM is the number of nameless args to
171 print. FIRST is nonzero if this is the first argument (not just
172 the first nameless arg). */
175 print_frame_nameless_args (struct frame_info
*fi
, long start
, int num
,
176 int first
, struct ui_file
*stream
)
182 for (i
= 0; i
< num
; i
++)
185 argsaddr
= get_frame_args_address (fi
);
188 arg_value
= read_memory_integer (argsaddr
+ start
, sizeof (int));
190 fprintf_filtered (stream
, ", ");
191 fprintf_filtered (stream
, "%ld", arg_value
);
193 start
+= sizeof (int);
197 /* Print the arguments of a stack frame, given the function FUNC
198 running in that frame (as a symbol), the info on the frame,
199 and the number of args according to the stack frame (or -1 if unknown). */
201 /* References here and elsewhere to "number of args according to the
202 stack frame" appear in all cases to refer to "number of ints of args
203 according to the stack frame". At least for VAX, i386, isi. */
206 print_frame_args (struct symbol
*func
, struct frame_info
*fi
, int num
,
207 struct ui_file
*stream
)
209 struct block
*b
= NULL
;
211 struct dict_iterator iter
;
214 /* Offset of next stack argument beyond the one we have seen that is
215 at the highest offset.
216 -1 if we haven't come to a stack argument yet. */
217 long highest_offset
= -1;
219 /* Number of ints of arguments that we have printed so far. */
220 int args_printed
= 0;
221 struct cleanup
*old_chain
, *list_chain
;
222 struct ui_stream
*stb
;
224 stb
= ui_out_stream_new (uiout
);
225 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
229 b
= SYMBOL_BLOCK_VALUE (func
);
231 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
235 /* Keep track of the highest stack argument offset seen, and
236 skip over any kinds of symbols we don't care about. */
238 switch (SYMBOL_CLASS (sym
))
243 long current_offset
= SYMBOL_VALUE (sym
);
244 arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
246 /* Compute address of next argument by adding the size of
247 this argument and rounding to an int boundary. */
249 ((current_offset
+ arg_size
+ sizeof (int) - 1)
250 & ~(sizeof (int) - 1));
252 /* If this is the highest offset seen yet, set highest_offset. */
253 if (highest_offset
== -1
254 || (current_offset
> highest_offset
))
255 highest_offset
= current_offset
;
257 /* Add the number of ints we're about to print to args_printed. */
258 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
261 /* We care about types of symbols, but don't need to keep track of
262 stack offsets in them. */
264 case LOC_REGPARM_ADDR
:
266 case LOC_BASEREG_ARG
:
267 case LOC_COMPUTED_ARG
:
270 /* Other types of symbols we just skip over. */
275 /* We have to look up the symbol because arguments can have
276 two entries (one a parameter, one a local) and the one we
277 want is the local, which lookup_symbol will find for us.
278 This includes gcc1 (not gcc2) on the sparc when passing a
279 small structure and gcc2 when the argument type is float
280 and it is passed as a double and converted to float by
281 the prologue (in the latter case the type of the LOC_ARG
282 symbol is double and the type of the LOC_LOCAL symbol is
284 /* But if the parameter name is null, don't try it.
285 Null parameter names occur on the RS/6000, for traceback tables.
286 FIXME, should we even print them? */
288 if (*DEPRECATED_SYMBOL_NAME (sym
))
292 (DEPRECATED_SYMBOL_NAME (sym
),
293 b
, VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
294 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
)
296 /* There is a LOC_ARG/LOC_REGISTER pair. This means that
297 it was passed on the stack and loaded into a register,
298 or passed in a register and stored in a stack slot.
299 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER.
301 Reasons for using the LOC_ARG:
302 (1) because find_saved_registers may be slow for remote
304 (2) because registers are often re-used and stack slots
305 rarely (never?) are. Therefore using the stack slot is
306 much less likely to print garbage.
308 Reasons why we might want to use the LOC_REGISTER:
309 (1) So that the backtrace prints the same value as
310 "print foo". I see no compelling reason why this needs
311 to be the case; having the backtrace print the value which
312 was passed in, and "print foo" print the value as modified
313 within the called function, makes perfect sense to me.
315 Additional note: It might be nice if "info args" displayed
317 One more note: There is a case with sparc structure passing
318 where we need to use the LOC_REGISTER, but this is dealt with
319 by creating a single LOC_REGPARM in symbol reading. */
321 /* Leave sym (the LOC_ARG) alone. */
328 /* Print the current arg. */
330 ui_out_text (uiout
, ", ");
331 ui_out_wrap_hint (uiout
, " ");
333 annotate_arg_begin ();
335 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
336 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
337 SYMBOL_LANGUAGE (sym
), DMGL_PARAMS
| DMGL_ANSI
);
338 ui_out_field_stream (uiout
, "name", stb
);
339 annotate_arg_name_end ();
340 ui_out_text (uiout
, "=");
342 /* Avoid value_print because it will deref ref parameters. We just
343 want to print their addresses. Print ??? for args whose address
344 we do not know. We pass 2 as "recurse" to val_print because our
345 standard indentation here is 4 spaces, and val_print indents
346 2 for each recurse. */
347 val
= read_var_value (sym
, fi
);
349 annotate_arg_value (val
== NULL
? NULL
: VALUE_TYPE (val
));
353 val_print (VALUE_TYPE (val
), VALUE_CONTENTS (val
), 0,
355 stb
->stream
, 0, 0, 2, Val_no_prettyprint
);
356 ui_out_field_stream (uiout
, "value", stb
);
359 ui_out_text (uiout
, "???");
361 /* Invoke ui_out_tuple_end. */
362 do_cleanups (list_chain
);
370 /* Don't print nameless args in situations where we don't know
371 enough about the stack to find them. */
376 if (highest_offset
== -1)
377 start
= FRAME_ARGS_SKIP
;
379 start
= highest_offset
;
381 print_frame_nameless_args (fi
, start
, num
- args_printed
,
384 do_cleanups (old_chain
);
387 /* Pass the args the way catch_errors wants them. */
390 print_args_stub (void *args
)
393 struct print_args_args
*p
= (struct print_args_args
*) args
;
395 if (FRAME_NUM_ARGS_P ())
397 numargs
= FRAME_NUM_ARGS (p
->fi
);
398 gdb_assert (numargs
>= 0);
402 print_frame_args (p
->func
, p
->fi
, numargs
, p
->stream
);
406 /* Print information about a frame for frame "fi" at level "level".
407 Used in "where" output, also used to emit breakpoint or step
409 LEVEL is the level of the frame, or -1 if it is the
410 innermost frame but we don't want to print the level.
411 The meaning of the SOURCE argument is:
412 SRC_LINE: Print only source line
413 LOCATION: Print only location
414 LOC_AND_SRC: Print location and source line. */
417 print_frame_info (struct frame_info
*fi
, int print_level
,
418 enum print_what print_what
, int print_args
)
420 struct symtab_and_line sal
;
424 if (get_frame_type (fi
) == DUMMY_FRAME
425 || get_frame_type (fi
) == SIGTRAMP_FRAME
)
427 struct cleanup
*uiout_cleanup
428 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
430 annotate_frame_begin (print_level
? frame_relative_level (fi
) : 0,
433 /* Do this regardless of SOURCE because we don't have any source
434 to list for this frame. */
437 ui_out_text (uiout
, "#");
438 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
439 frame_relative_level (fi
));
441 if (ui_out_is_mi_like_p (uiout
))
443 annotate_frame_address ();
444 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
445 annotate_frame_address_end ();
448 if (get_frame_type (fi
) == DUMMY_FRAME
)
450 annotate_function_call ();
451 ui_out_field_string (uiout
, "func", "<function called from gdb>");
453 else if (get_frame_type (fi
) == SIGTRAMP_FRAME
)
455 annotate_signal_handler_caller ();
456 ui_out_field_string (uiout
, "func", "<signal handler called>");
458 ui_out_text (uiout
, "\n");
459 annotate_frame_end ();
461 do_cleanups (uiout_cleanup
);
465 /* If fi is not the innermost frame, that normally means that fi->pc
466 points to *after* the call instruction, and we want to get the
467 line containing the call, never the next line. But if the next
468 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
469 was not entered as the result of a call, and we want to get the
470 line containing fi->pc. */
471 find_frame_sal (fi
, &sal
);
473 location_print
= (print_what
== LOCATION
474 || print_what
== LOC_AND_ADDRESS
475 || print_what
== SRC_AND_LOC
);
477 if (location_print
|| !sal
.symtab
)
478 print_frame (fi
, print_level
, print_what
, print_args
, sal
);
480 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
483 set_current_source_symtab_and_line (&sal
);
485 if (source_print
&& sal
.symtab
)
487 struct symtab_and_line cursal
;
489 int mid_statement
= ((print_what
== SRC_LINE
)
490 && (get_frame_pc (fi
) != sal
.pc
));
492 if (annotation_level
)
493 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
497 if (deprecated_print_frame_info_listing_hook
)
498 deprecated_print_frame_info_listing_hook (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
501 /* We used to do this earlier, but that is clearly
502 wrong. This function is used by many different
503 parts of gdb, including normal_stop in infrun.c,
504 which uses this to print out the current PC
505 when we stepi/nexti into the middle of a source
506 line. Only the command line really wants this
507 behavior. Other UIs probably would like the
508 ability to decide for themselves if it is desired. */
509 if (addressprint
&& mid_statement
)
511 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
512 ui_out_text (uiout
, "\t");
515 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
518 /* Make sure we have at least a default source file */
519 set_default_source_symtab_and_line ();
520 cursal
= get_current_source_symtab_and_line ();
521 cursal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
522 set_current_source_symtab_and_line (&cursal
);
525 if (print_what
!= LOCATION
)
526 set_default_breakpoint (1, get_frame_pc (fi
), sal
.symtab
, sal
.line
);
528 annotate_frame_end ();
530 gdb_flush (gdb_stdout
);
534 print_frame (struct frame_info
*fi
,
536 enum print_what print_what
,
538 struct symtab_and_line sal
)
542 enum language funlang
= language_unknown
;
543 struct ui_stream
*stb
;
544 struct cleanup
*old_chain
;
545 struct cleanup
*list_chain
;
547 stb
= ui_out_stream_new (uiout
);
548 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
550 func
= find_pc_function (get_frame_address_in_block (fi
));
553 /* In certain pathological cases, the symtabs give the wrong
554 function (when we are in the first function in a file which
555 is compiled without debugging symbols, the previous function
556 is compiled with debugging symbols, and the "foo.o" symbol
557 that is supposed to tell us where the file with debugging symbols
558 ends has been truncated by ar because it is longer than 15
559 characters). This also occurs if the user uses asm() to create
560 a function but not stabs for it (in a file compiled -g).
562 So look in the minimal symbol tables as well, and if it comes
563 up with a larger address for the function use that instead.
564 I don't think this can ever cause any problems; there shouldn't
565 be any minimal symbols in the middle of a function; if this is
566 ever changed many parts of GDB will need to be changed (and we'll
567 create a find_pc_minimal_function or some such). */
569 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi
));
571 && (SYMBOL_VALUE_ADDRESS (msymbol
)
572 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
575 /* There is no particular reason to think the line number
576 information is wrong. Someone might have just put in
577 a label with asm() but left the line numbers alone. */
578 /* In this case we have no way of knowing the source file
579 and line number, so don't print them. */
582 /* We also don't know anything about the function besides
583 its address and name. */
585 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
586 funlang
= SYMBOL_LANGUAGE (msymbol
);
590 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
591 demangled name that we already have stored in the symbol
592 table, but we stored a version with DMGL_PARAMS turned
593 on, and here we don't want to display parameters. So call
594 the demangler again, with DMGL_ANSI only. (Yes, I know
595 that printf_symbol_filtered() will again try to demangle
596 the name on the fly, but the issue is that if
597 cplus_demangle() fails here, it'll fail there too. So we
598 want to catch the failure ("demangled==NULL" case below)
599 here, while we still have our hands on the function
602 funname
= DEPRECATED_SYMBOL_NAME (func
);
603 funlang
= SYMBOL_LANGUAGE (func
);
604 if (funlang
== language_cplus
)
606 demangled
= cplus_demangle (funname
, DMGL_ANSI
);
607 if (demangled
== NULL
)
608 /* If the demangler fails, try the demangled name from
609 the symbol table. This'll have parameters, but
610 that's preferable to diplaying a mangled name. */
611 funname
= SYMBOL_PRINT_NAME (func
);
617 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi
));
620 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
621 funlang
= SYMBOL_LANGUAGE (msymbol
);
625 annotate_frame_begin (print_level
? frame_relative_level (fi
) : 0,
628 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
632 ui_out_text (uiout
, "#");
633 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
634 frame_relative_level (fi
));
637 if (get_frame_pc (fi
) != sal
.pc
639 || print_what
== LOC_AND_ADDRESS
)
641 annotate_frame_address ();
642 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (fi
));
643 annotate_frame_address_end ();
644 ui_out_text (uiout
, " in ");
646 annotate_frame_function_name ();
647 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??", funlang
,
649 ui_out_field_stream (uiout
, "func", stb
);
650 ui_out_wrap_hint (uiout
, " ");
651 annotate_frame_args ();
653 ui_out_text (uiout
, " (");
656 struct print_args_args args
;
657 struct cleanup
*args_list_chain
;
660 args
.stream
= gdb_stdout
;
661 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
662 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ALL
);
663 /* FIXME: args must be a list. If one argument is a string it will
664 have " that will not be properly escaped. */
665 /* Invoke ui_out_tuple_end. */
666 do_cleanups (args_list_chain
);
669 ui_out_text (uiout
, ")");
670 if (sal
.symtab
&& sal
.symtab
->filename
)
672 annotate_frame_source_begin ();
673 ui_out_wrap_hint (uiout
, " ");
674 ui_out_text (uiout
, " at ");
675 annotate_frame_source_file ();
676 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
677 annotate_frame_source_file_end ();
678 ui_out_text (uiout
, ":");
679 annotate_frame_source_line ();
680 ui_out_field_int (uiout
, "line", sal
.line
);
681 annotate_frame_source_end ();
685 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
687 char *lib
= PC_SOLIB (get_frame_pc (fi
));
690 annotate_frame_where ();
691 ui_out_wrap_hint (uiout
, " ");
692 ui_out_text (uiout
, " from ");
693 ui_out_field_string (uiout
, "from", lib
);
696 #endif /* PC_SOLIB */
698 /* do_cleanups will call ui_out_tuple_end() for us. */
699 do_cleanups (list_chain
);
700 ui_out_text (uiout
, "\n");
701 do_cleanups (old_chain
);
704 /* Show the frame info. If this is the tui, it will be shown in
705 the source display otherwise, nothing is done */
707 show_stack_frame (struct frame_info
*fi
)
712 /* Read a frame specification in whatever the appropriate format is.
713 Call error() if the specification is in any way invalid (i.e.
714 this function never returns NULL). */
717 parse_frame_specification (char *frame_exp
)
721 CORE_ADDR args
[MAXARGS
];
726 char *addr_string
, *p
;
727 struct cleanup
*tmp_cleanup
;
729 while (*frame_exp
== ' ')
734 if (numargs
> MAXARGS
)
735 error ("Too many args in frame specification");
736 /* Parse an argument. */
737 for (p
= frame_exp
; *p
&& *p
!= ' '; p
++)
739 addr_string
= savestring (frame_exp
, p
- frame_exp
);
744 tmp_cleanup
= make_cleanup (xfree
, addr_string
);
746 /* NOTE: we call parse_and_eval and then both
747 value_as_long and value_as_address rather than calling
748 parse_and_eval_long and parse_and_eval_address because
749 of the issue of potential side effects from evaluating
751 vp
= parse_and_eval (addr_string
);
753 level
= value_as_long (vp
);
755 args
[numargs
++] = value_as_address (vp
);
756 do_cleanups (tmp_cleanup
);
759 /* Skip spaces, move to possible next arg. */
769 if (deprecated_selected_frame
== NULL
)
770 error ("No selected frame.");
771 return deprecated_selected_frame
;
775 struct frame_info
*fid
=
776 find_relative_frame (get_current_frame (), &level
);
777 struct frame_info
*tfid
;
780 /* find_relative_frame was successful */
783 /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications
784 take at least 2 addresses. It is important to detect this case
785 here so that "frame 100" does not give a confusing error message
786 like "frame specification requires two addresses". This of course
787 does not solve the "frame 100" problem for machines on which
788 a frame specification can be made with one address. To solve
789 that, we need a new syntax for a specifying a frame by address.
790 I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for
791 two args, etc.), but people might think that is too much typing,
792 so I guess *0x23,0x45 would be a possible alternative (commas
793 really should be used instead of spaces to delimit; using spaces
794 normally works in an expression). */
795 #ifdef SETUP_ARBITRARY_FRAME
796 error ("No frame %s", paddr_d (args
[0]));
799 /* If (s)he specifies the frame with an address, he deserves what
800 (s)he gets. Still, give the highest one that matches. */
802 for (fid
= get_current_frame ();
803 fid
&& get_frame_base (fid
) != args
[0];
804 fid
= get_prev_frame (fid
))
808 while ((tfid
= get_prev_frame (fid
)) &&
809 (get_frame_base (tfid
) == args
[0]))
812 /* We couldn't identify the frame as an existing frame, but
813 perhaps we can create one with a single argument. */
817 #ifdef SETUP_ARBITRARY_FRAME
818 return SETUP_ARBITRARY_FRAME (numargs
, args
);
820 /* Usual case. Do it here rather than have everyone supply
821 a SETUP_ARBITRARY_FRAME that does this. */
823 return create_new_frame (args
[0], 0);
824 error ("Too many args in frame specification");
831 /* Print verbosely the selected frame or the frame at address ADDR.
832 This means absolutely all information in the frame is printed. */
835 frame_info (char *addr_exp
, int from_tty
)
837 struct frame_info
*fi
;
838 struct symtab_and_line sal
;
841 struct frame_info
*calling_frame_info
;
842 int i
, count
, numregs
;
844 enum language funlang
= language_unknown
;
845 const char *pc_regname
;
847 if (!target_has_stack
)
850 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
851 is not a good name. */
853 /* OK, this is weird. The PC_REGNUM hardware register's value can
854 easily not match that of the internal value returned by
856 pc_regname
= REGISTER_NAME (PC_REGNUM
);
858 /* But then, this is weird to. Even without PC_REGNUM, an
859 architectures will often have a hardware register called "pc",
860 and that register's value, again, can easily not match
864 fi
= parse_frame_specification (addr_exp
);
866 error ("Invalid frame specified.");
868 find_frame_sal (fi
, &sal
);
869 func
= get_frame_function (fi
);
870 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
872 s
= find_pc_symtab (get_frame_pc (fi
));
875 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
876 * the demangled name that we already have stored in
877 * the symbol table, but we stored a version with
878 * DMGL_PARAMS turned on, and here we don't want
879 * to display parameters. So call the demangler again,
880 * with DMGL_ANSI only. RT
881 * (Yes, I know that printf_symbol_filtered() will
882 * again try to demangle the name on the fly, but
883 * the issue is that if cplus_demangle() fails here,
884 * it'll fail there too. So we want to catch the failure
885 * ("demangled==NULL" case below) here, while we still
886 * have our hands on the function symbol.)
889 funname
= DEPRECATED_SYMBOL_NAME (func
);
890 funlang
= SYMBOL_LANGUAGE (func
);
891 if (funlang
== language_cplus
)
893 demangled
= cplus_demangle (funname
, DMGL_ANSI
);
894 /* If the demangler fails, try the demangled name
895 * from the symbol table. This'll have parameters,
896 * but that's preferable to diplaying a mangled name.
898 if (demangled
== NULL
)
899 funname
= SYMBOL_PRINT_NAME (func
);
904 struct minimal_symbol
*msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
907 funname
= DEPRECATED_SYMBOL_NAME (msymbol
);
908 funlang
= SYMBOL_LANGUAGE (msymbol
);
911 calling_frame_info
= get_prev_frame (fi
);
913 if (!addr_exp
&& frame_relative_level (deprecated_selected_frame
) >= 0)
915 printf_filtered ("Stack level %d, frame at ",
916 frame_relative_level (deprecated_selected_frame
));
917 print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
918 printf_filtered (":\n");
922 printf_filtered ("Stack frame at ");
923 print_address_numeric (get_frame_base (fi
), 1, gdb_stdout
);
924 printf_filtered (":\n");
926 printf_filtered (" %s = ", pc_regname
);
927 print_address_numeric (get_frame_pc (fi
), 1, gdb_stdout
);
932 printf_filtered (" in ");
933 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
934 DMGL_ANSI
| DMGL_PARAMS
);
938 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
939 puts_filtered ("; ");
941 printf_filtered ("saved %s ", pc_regname
);
942 print_address_numeric (frame_pc_unwind (fi
), 1, gdb_stdout
);
943 printf_filtered ("\n");
947 frameless
= (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P ()
948 && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (fi
));
950 printf_filtered (" (FRAMELESS),");
953 if (calling_frame_info
)
955 printf_filtered (" called by frame at ");
956 print_address_numeric (get_frame_base (calling_frame_info
),
959 if (get_next_frame (fi
) && calling_frame_info
)
962 if (get_next_frame (fi
))
964 printf_filtered (" caller of frame at ");
965 print_address_numeric (get_frame_base (get_next_frame (fi
)), 1,
968 if (get_next_frame (fi
) || calling_frame_info
)
969 puts_filtered ("\n");
971 printf_filtered (" source language %s.\n",
972 language_str (s
->language
));
975 /* Address of the argument list for this frame, or 0. */
976 CORE_ADDR arg_list
= get_frame_args_address (fi
);
977 /* Number of args for this frame, or -1 if unknown. */
981 printf_filtered (" Arglist at unknown address.\n");
984 printf_filtered (" Arglist at ");
985 print_address_numeric (arg_list
, 1, gdb_stdout
);
986 printf_filtered (",");
988 if (!FRAME_NUM_ARGS_P ())
991 puts_filtered (" args: ");
995 numargs
= FRAME_NUM_ARGS (fi
);
996 gdb_assert (numargs
>= 0);
998 puts_filtered (" no args.");
999 else if (numargs
== 1)
1000 puts_filtered (" 1 arg: ");
1002 printf_filtered (" %d args: ", numargs
);
1004 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1005 puts_filtered ("\n");
1009 /* Address of the local variables for this frame, or 0. */
1010 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1013 printf_filtered (" Locals at unknown address,");
1016 printf_filtered (" Locals at ");
1017 print_address_numeric (arg_list
, 1, gdb_stdout
);
1018 printf_filtered (",");
1022 if (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()
1023 && deprecated_get_frame_saved_regs (fi
) == NULL
)
1024 DEPRECATED_FRAME_INIT_SAVED_REGS (fi
);
1025 /* Print as much information as possible on the location of all the
1028 enum lval_type lval
;
1036 /* The sp is special; what's displayed isn't the save address, but
1037 the value of the previous frame's sp. This is a legacy thing,
1038 at one stage the frame cached the previous frame's SP instead
1039 of its address, hence it was easiest to just display the cached
1043 /* Find out the location of the saved stack pointer with out
1044 actually evaluating it. */
1045 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1047 if (!optimized
&& lval
== not_lval
)
1049 char value
[MAX_REGISTER_SIZE
];
1051 frame_register_unwind (fi
, SP_REGNUM
, &optimized
, &lval
, &addr
,
1053 /* NOTE: cagney/2003-05-22: This is assuming that the
1054 stack pointer was packed as an unsigned integer. That
1055 may or may not be valid. */
1056 sp
= extract_unsigned_integer (value
, DEPRECATED_REGISTER_RAW_SIZE (SP_REGNUM
));
1057 printf_filtered (" Previous frame's sp is ");
1058 print_address_numeric (sp
, 1, gdb_stdout
);
1059 printf_filtered ("\n");
1062 else if (!optimized
&& lval
== lval_memory
)
1064 printf_filtered (" Previous frame's sp at ");
1065 print_address_numeric (addr
, 1, gdb_stdout
);
1066 printf_filtered ("\n");
1069 else if (!optimized
&& lval
== lval_register
)
1071 printf_filtered (" Previous frame's sp in %s\n",
1072 REGISTER_NAME (realnum
));
1075 /* else keep quiet. */
1079 numregs
= NUM_REGS
+ NUM_PSEUDO_REGS
;
1080 for (i
= 0; i
< numregs
; i
++)
1082 && gdbarch_register_reggroup_p (current_gdbarch
, i
, all_reggroup
))
1084 /* Find out the location of the saved register without
1085 fetching the corresponding value. */
1086 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1088 /* For moment, only display registers that were saved on the
1090 if (!optimized
&& lval
== lval_memory
)
1093 puts_filtered (" Saved registers:\n ");
1095 puts_filtered (",");
1097 printf_filtered (" %s at ", REGISTER_NAME (i
));
1098 print_address_numeric (addr
, 1, gdb_stdout
);
1102 if (count
|| need_nl
)
1103 puts_filtered ("\n");
1108 /* Set a limit on the number of frames printed by default in a
1111 static int backtrace_limit
;
1114 set_backtrace_limit_command (char *count_exp
, int from_tty
)
1116 int count
= parse_and_eval_long (count_exp
);
1119 error ("Negative argument not meaningful as backtrace limit.");
1121 backtrace_limit
= count
;
1125 backtrace_limit_info (char *arg
, int from_tty
)
1128 error ("\"Info backtrace-limit\" takes no arguments.");
1130 printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit
);
1134 /* Print briefly all stack frames or just the innermost COUNT frames. */
1136 static void backtrace_command_1 (char *count_exp
, int show_locals
,
1139 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1141 struct frame_info
*fi
;
1144 struct frame_info
*trailing
;
1147 if (!target_has_stack
)
1148 error ("No stack.");
1150 /* The following code must do two things. First, it must
1151 set the variable TRAILING to the frame from which we should start
1152 printing. Second, it must set the variable count to the number
1153 of frames which we should print, or -1 if all of them. */
1154 trailing
= get_current_frame ();
1156 /* The target can be in a state where there is no valid frames
1157 (e.g., just connected). */
1158 if (trailing
== NULL
)
1159 error ("No stack.");
1164 count
= parse_and_eval_long (count_exp
);
1167 struct frame_info
*current
;
1172 while (current
&& count
--)
1175 current
= get_prev_frame (current
);
1178 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1179 will be COUNT below it. */
1183 trailing
= get_prev_frame (trailing
);
1184 current
= get_prev_frame (current
);
1196 struct partial_symtab
*ps
;
1198 /* Read in symbols for all of the frames. Need to do this in
1199 a separate pass so that "Reading in symbols for xxx" messages
1200 don't screw up the appearance of the backtrace. Also
1201 if people have strong opinions against reading symbols for
1202 backtrace this may have to be an option. */
1206 fi
= get_prev_frame (fi
))
1209 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1211 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in */
1215 for (i
= 0, fi
= trailing
;
1217 i
++, fi
= get_prev_frame (fi
))
1221 /* Don't use print_stack_frame; if an error() occurs it probably
1222 means further attempts to backtrace would fail (on the other
1223 hand, perhaps the code does or could be fixed to make sure
1224 the frame->prev field gets set to NULL in that case). */
1225 print_frame_info (fi
, 1, LOCATION
, 1);
1227 print_frame_local_vars (fi
, 1, gdb_stdout
);
1230 /* If we've stopped before the end, mention that. */
1232 printf_filtered ("(More stack frames follow...)\n");
1236 backtrace_command (char *arg
, int from_tty
)
1238 struct cleanup
*old_chain
= (struct cleanup
*) NULL
;
1239 char **argv
= (char **) NULL
;
1240 int argIndicatingFullTrace
= (-1), totArgLen
= 0, argc
= 0;
1243 if (arg
!= (char *) NULL
)
1247 argv
= buildargv (arg
);
1248 old_chain
= make_cleanup_freeargv (argv
);
1250 for (i
= 0; (argv
[i
] != (char *) NULL
); i
++)
1254 for (j
= 0; (j
< strlen (argv
[i
])); j
++)
1255 argv
[i
][j
] = tolower (argv
[i
][j
]);
1257 if (argIndicatingFullTrace
< 0 && subset_compare (argv
[i
], "full"))
1258 argIndicatingFullTrace
= argc
;
1262 totArgLen
+= strlen (argv
[i
]);
1266 if (argIndicatingFullTrace
>= 0)
1270 argPtr
= (char *) xmalloc (totArgLen
+ 1);
1275 memset (argPtr
, 0, totArgLen
+ 1);
1276 for (i
= 0; (i
< (argc
+ 1)); i
++)
1278 if (i
!= argIndicatingFullTrace
)
1280 strcat (argPtr
, argv
[i
]);
1281 strcat (argPtr
, " ");
1287 argPtr
= (char *) NULL
;
1291 backtrace_command_1 (argPtr
, (argIndicatingFullTrace
>= 0), from_tty
);
1293 if (argIndicatingFullTrace
>= 0 && totArgLen
> 0)
1297 do_cleanups (old_chain
);
1300 static void backtrace_full_command (char *arg
, int from_tty
);
1302 backtrace_full_command (char *arg
, int from_tty
)
1304 backtrace_command_1 (arg
, 1, from_tty
);
1308 /* Print the local variables of a block B active in FRAME.
1309 Return 1 if any variables were printed; 0 otherwise. */
1312 print_block_frame_locals (struct block
*b
, struct frame_info
*fi
,
1313 int num_tabs
, struct ui_file
*stream
)
1315 struct dict_iterator iter
;
1318 int values_printed
= 0;
1320 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1322 switch (SYMBOL_CLASS (sym
))
1330 for (j
= 0; j
< num_tabs
; j
++)
1331 fputs_filtered ("\t", stream
);
1332 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1333 fputs_filtered (" = ", stream
);
1334 print_variable_value (sym
, fi
, stream
);
1335 fprintf_filtered (stream
, "\n");
1339 /* Ignore symbols which are not locals. */
1343 return values_printed
;
1346 /* Same, but print labels. */
1349 print_block_frame_labels (struct block
*b
, int *have_default
,
1350 struct ui_file
*stream
)
1352 struct dict_iterator iter
;
1354 int values_printed
= 0;
1356 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1358 if (DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (sym
), "default"))
1364 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1366 struct symtab_and_line sal
;
1367 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1369 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1372 fprintf_filtered (stream
, " ");
1373 print_address_numeric (SYMBOL_VALUE_ADDRESS (sym
), 1, stream
);
1375 fprintf_filtered (stream
, " in file %s, line %d\n",
1376 sal
.symtab
->filename
, sal
.line
);
1379 return values_printed
;
1382 /* Print on STREAM all the local variables in frame FRAME,
1383 including all the blocks active in that frame
1386 Returns 1 if the job was done,
1387 or 0 if nothing was printed because we have no info
1388 on the function running in FRAME. */
1391 print_frame_local_vars (struct frame_info
*fi
, int num_tabs
,
1392 struct ui_file
*stream
)
1394 struct block
*block
= get_frame_block (fi
, 0);
1395 int values_printed
= 0;
1399 fprintf_filtered (stream
, "No symbol table info available.\n");
1405 if (print_block_frame_locals (block
, fi
, num_tabs
, stream
))
1407 /* After handling the function's top-level block, stop.
1408 Don't continue to its superblock, the block of
1409 per-file symbols. */
1410 if (BLOCK_FUNCTION (block
))
1412 block
= BLOCK_SUPERBLOCK (block
);
1415 if (!values_printed
)
1417 fprintf_filtered (stream
, "No locals.\n");
1421 /* Same, but print labels. */
1424 print_frame_label_vars (struct frame_info
*fi
, int this_level_only
,
1425 struct ui_file
*stream
)
1427 struct blockvector
*bl
;
1428 struct block
*block
= get_frame_block (fi
, 0);
1429 int values_printed
= 0;
1430 int index
, have_default
= 0;
1431 char *blocks_printed
;
1432 CORE_ADDR pc
= get_frame_pc (fi
);
1436 fprintf_filtered (stream
, "No symbol table info available.\n");
1440 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1441 blocks_printed
= (char *) alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1442 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1446 CORE_ADDR end
= BLOCK_END (block
) - 4;
1449 if (bl
!= blockvector_for_pc (end
, &index
))
1450 error ("blockvector blotch");
1451 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1452 error ("blockvector botch");
1453 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1456 /* Don't print out blocks that have gone by. */
1457 while (index
< last_index
1458 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1461 while (index
< last_index
1462 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1464 if (blocks_printed
[index
] == 0)
1466 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
), &have_default
, stream
))
1468 blocks_printed
[index
] = 1;
1474 if (values_printed
&& this_level_only
)
1477 /* After handling the function's top-level block, stop.
1478 Don't continue to its superblock, the block of
1479 per-file symbols. */
1480 if (BLOCK_FUNCTION (block
))
1482 block
= BLOCK_SUPERBLOCK (block
);
1485 if (!values_printed
&& !this_level_only
)
1487 fprintf_filtered (stream
, "No catches.\n");
1492 locals_info (char *args
, int from_tty
)
1494 if (!deprecated_selected_frame
)
1495 error ("No frame selected.");
1496 print_frame_local_vars (deprecated_selected_frame
, 0, gdb_stdout
);
1500 catch_info (char *ignore
, int from_tty
)
1502 struct symtab_and_line
*sal
;
1504 /* Check for target support for exception handling */
1505 sal
= target_enable_exception_callback (EX_EVENT_CATCH
, 1);
1508 /* Currently not handling this */
1509 /* Ideally, here we should interact with the C++ runtime
1510 system to find the list of active handlers, etc. */
1511 fprintf_filtered (gdb_stdout
, "Info catch not supported with this target/compiler combination.\n");
1513 if (!deprecated_selected_frame
)
1514 error ("No frame selected.");
1519 /* Assume g++ compiled code -- old v 4.16 behaviour */
1520 if (!deprecated_selected_frame
)
1521 error ("No frame selected.");
1523 print_frame_label_vars (deprecated_selected_frame
, 0, gdb_stdout
);
1528 print_frame_arg_vars (struct frame_info
*fi
,
1529 struct ui_file
*stream
)
1531 struct symbol
*func
= get_frame_function (fi
);
1533 struct dict_iterator iter
;
1534 struct symbol
*sym
, *sym2
;
1535 int values_printed
= 0;
1539 fprintf_filtered (stream
, "No symbol table info available.\n");
1543 b
= SYMBOL_BLOCK_VALUE (func
);
1544 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1546 switch (SYMBOL_CLASS (sym
))
1552 case LOC_REGPARM_ADDR
:
1553 case LOC_BASEREG_ARG
:
1554 case LOC_COMPUTED_ARG
:
1556 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1557 fputs_filtered (" = ", stream
);
1559 /* We have to look up the symbol because arguments can have
1560 two entries (one a parameter, one a local) and the one we
1561 want is the local, which lookup_symbol will find for us.
1562 This includes gcc1 (not gcc2) on the sparc when passing a
1563 small structure and gcc2 when the argument type is float
1564 and it is passed as a double and converted to float by
1565 the prologue (in the latter case the type of the LOC_ARG
1566 symbol is double and the type of the LOC_LOCAL symbol is
1567 float). There are also LOC_ARG/LOC_REGISTER pairs which
1568 are not combined in symbol-reading. */
1570 sym2
= lookup_symbol (DEPRECATED_SYMBOL_NAME (sym
),
1571 b
, VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
1572 print_variable_value (sym2
, fi
, stream
);
1573 fprintf_filtered (stream
, "\n");
1577 /* Don't worry about things which aren't arguments. */
1581 if (!values_printed
)
1583 fprintf_filtered (stream
, "No arguments.\n");
1588 args_info (char *ignore
, int from_tty
)
1590 if (!deprecated_selected_frame
)
1591 error ("No frame selected.");
1592 print_frame_arg_vars (deprecated_selected_frame
, gdb_stdout
);
1597 args_plus_locals_info (char *ignore
, int from_tty
)
1599 args_info (ignore
, from_tty
);
1600 locals_info (ignore
, from_tty
);
1604 /* Select frame FI. Also print the stack frame and show the source if
1605 this is the tui version. */
1607 select_and_print_frame (struct frame_info
*fi
)
1611 print_stack_frame (fi
, 1, SRC_AND_LOC
);
1614 /* Return the symbol-block in which the selected frame is executing.
1615 Can return zero under various legitimate circumstances.
1617 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1618 code address within the block returned. We use this to decide
1619 which macros are in scope. */
1622 get_selected_block (CORE_ADDR
*addr_in_block
)
1624 if (!target_has_stack
)
1627 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1628 a selected/current frame? Perhaphs this function is called,
1629 indirectly, by WFI in "infrun.c" where avoiding the creation of
1630 an inner most frame is very important (it slows down single
1631 step). I suspect, though that this was true in the deep dark
1632 past but is no longer the case. A mindless look at all the
1633 callers tends to support this theory. I think we should be able
1634 to assume that there is always a selcted frame. */
1635 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1637 if (!deprecated_selected_frame
)
1639 CORE_ADDR pc
= read_pc ();
1640 if (addr_in_block
!= NULL
)
1641 *addr_in_block
= pc
;
1642 return block_for_pc (pc
);
1644 return get_frame_block (deprecated_selected_frame
, addr_in_block
);
1647 /* Find a frame a certain number of levels away from FRAME.
1648 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1649 Positive means go to earlier frames (up); negative, the reverse.
1650 The int that contains the number of levels is counted toward
1651 zero as the frames for those levels are found.
1652 If the top or bottom frame is reached, that frame is returned,
1653 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1654 how much farther the original request asked to go. */
1657 find_relative_frame (struct frame_info
*frame
,
1658 int *level_offset_ptr
)
1660 struct frame_info
*prev
;
1661 struct frame_info
*frame1
;
1663 /* Going up is simple: just do get_prev_frame enough times
1664 or until initial frame is reached. */
1665 while (*level_offset_ptr
> 0)
1667 prev
= get_prev_frame (frame
);
1670 (*level_offset_ptr
)--;
1673 /* Going down is just as simple. */
1674 if (*level_offset_ptr
< 0)
1676 while (*level_offset_ptr
< 0)
1678 frame1
= get_next_frame (frame
);
1682 (*level_offset_ptr
)++;
1688 /* The "select_frame" command. With no arg, NOP.
1689 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1690 valid level. Otherwise, treat level_exp as an address expression
1691 and select it. See parse_frame_specification for more info on proper
1692 frame expressions. */
1695 select_frame_command (char *level_exp
, int from_tty
)
1697 struct frame_info
*frame
;
1698 int level
= frame_relative_level (deprecated_selected_frame
);
1700 if (!target_has_stack
)
1701 error ("No stack.");
1703 frame
= parse_frame_specification (level_exp
);
1705 select_frame (frame
);
1706 if (level
!= frame_relative_level (deprecated_selected_frame
))
1707 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame
));
1710 /* The "frame" command. With no arg, print selected frame briefly.
1711 With arg, behaves like select_frame and then prints the selected
1715 frame_command (char *level_exp
, int from_tty
)
1717 select_frame_command (level_exp
, from_tty
);
1718 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC
);
1721 /* The XDB Compatibility command to print the current frame. */
1724 current_frame_command (char *level_exp
, int from_tty
)
1726 if (target_has_stack
== 0 || deprecated_selected_frame
== 0)
1727 error ("No stack.");
1728 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC
);
1731 /* Select the frame up one or COUNT stack levels
1732 from the previously selected frame, and print it briefly. */
1735 up_silently_base (char *count_exp
)
1737 struct frame_info
*fi
;
1738 int count
= 1, count1
;
1740 count
= parse_and_eval_long (count_exp
);
1743 if (target_has_stack
== 0 || deprecated_selected_frame
== 0)
1744 error ("No stack.");
1746 fi
= find_relative_frame (deprecated_selected_frame
, &count1
);
1747 if (count1
!= 0 && count_exp
== 0)
1748 error ("Initial frame selected; you cannot go up.");
1750 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame
));
1754 up_silently_command (char *count_exp
, int from_tty
)
1756 up_silently_base (count_exp
);
1760 up_command (char *count_exp
, int from_tty
)
1762 up_silently_base (count_exp
);
1763 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC
);
1766 /* Select the frame down one or COUNT stack levels
1767 from the previously selected frame, and print it briefly. */
1770 down_silently_base (char *count_exp
)
1772 struct frame_info
*frame
;
1773 int count
= -1, count1
;
1775 count
= -parse_and_eval_long (count_exp
);
1778 if (target_has_stack
== 0 || deprecated_selected_frame
== 0)
1779 error ("No stack.");
1781 frame
= find_relative_frame (deprecated_selected_frame
, &count1
);
1782 if (count1
!= 0 && count_exp
== 0)
1785 /* We only do this if count_exp is not specified. That way "down"
1786 means to really go down (and let me know if that is
1787 impossible), but "down 9999" can be used to mean go all the way
1788 down without getting an error. */
1790 error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
1793 select_frame (frame
);
1794 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame
));
1798 down_silently_command (char *count_exp
, int from_tty
)
1800 down_silently_base (count_exp
);
1804 down_command (char *count_exp
, int from_tty
)
1806 down_silently_base (count_exp
);
1807 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC
);
1811 return_command (char *retval_exp
, int from_tty
)
1813 struct symbol
*thisfun
;
1814 struct value
*return_value
= NULL
;
1815 const char *query_prefix
= "";
1817 /* FIXME: cagney/2003-10-20: Perform a minimal existance test on the
1818 target. If that fails, error out. For the moment don't rely on
1819 get_selected_frame as it's error message is the the singularly
1820 obscure "No registers". */
1821 if (!target_has_registers
)
1822 error ("No selected frame.");
1823 thisfun
= get_frame_function (get_selected_frame ());
1825 /* Compute the return value. If the computation triggers an error,
1826 let it bail. If the return type can't be handled, set
1827 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1831 struct type
*return_type
= NULL
;
1833 /* Compute the return value. Should the computation fail, this
1834 call throws an error. */
1835 return_value
= parse_and_eval (retval_exp
);
1837 /* Cast return value to the return type of the function. Should
1838 the cast fail, this call throws an error. */
1839 if (thisfun
!= NULL
)
1840 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1841 if (return_type
== NULL
)
1842 return_type
= builtin_type_int
;
1843 CHECK_TYPEDEF (return_type
);
1844 return_value
= value_cast (return_type
, return_value
);
1846 /* Make sure the value is fully evaluated. It may live in the
1847 stack frame we're about to pop. */
1848 if (VALUE_LAZY (return_value
))
1849 value_fetch_lazy (return_value
);
1851 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1852 /* If the return-type is "void", don't try to find the
1853 return-value's location. However, do still evaluate the
1854 return expression so that, even when the expression result
1855 is discarded, side effects such as "return i++" still
1857 return_value
= NULL
;
1858 /* FIXME: cagney/2004-01-17: If the architecture implements both
1859 return_value and extract_returned_value_address, should allow
1860 "return" to work - don't set return_value to NULL. */
1861 else if (!gdbarch_return_value_p (current_gdbarch
)
1862 && (TYPE_CODE (return_type
) == TYPE_CODE_STRUCT
1863 || TYPE_CODE (return_type
) == TYPE_CODE_UNION
))
1865 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1866 code. Old architectures don't expect STORE_RETURN_VALUE
1867 to be called with with a small struct that needs to be
1868 stored in registers. Don't start doing it now. */
1870 A structure or union return type is not supported by this architecture.\n\
1871 If you continue, the return value that you specified will be ignored.\n";
1872 return_value
= NULL
;
1874 else if (using_struct_return (return_type
, 0))
1877 The location at which to store the function's return value is unknown.\n\
1878 If you continue, the return value that you specified will be ignored.\n";
1879 return_value
= NULL
;
1883 /* Does an interactive user really want to do this? Include
1884 information, such as how well GDB can handle the return value, in
1885 the query message. */
1889 if (thisfun
== NULL
)
1890 confirmed
= query ("%sMake selected stack frame return now? ",
1893 confirmed
= query ("%sMake %s return now? ", query_prefix
,
1894 SYMBOL_PRINT_NAME (thisfun
));
1896 error ("Not confirmed");
1899 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1900 frame in turn, should this code just go straight to the relevant
1901 frame and pop that? */
1903 /* First discard all frames inner-to the selected frame (making the
1904 selected frame current). */
1906 struct frame_id selected_id
= get_frame_id (get_selected_frame ());
1907 while (!frame_id_eq (selected_id
, get_frame_id (get_current_frame ())))
1909 if (frame_id_inner (selected_id
, get_frame_id (get_current_frame ())))
1910 /* Caught in the safety net, oops! We've gone way past the
1912 error ("Problem while popping stack frames (corrupt stack?)");
1913 frame_pop (get_current_frame ());
1917 /* Second discard the selected frame (which is now also the current
1919 frame_pop (get_current_frame ());
1921 /* Store RETURN_VAUE in the just-returned register set. */
1922 if (return_value
!= NULL
)
1924 struct type
*return_type
= VALUE_TYPE (return_value
);
1925 if (!gdbarch_return_value_p (current_gdbarch
))
1927 STORE_RETURN_VALUE (return_type
, current_regcache
,
1928 VALUE_CONTENTS (return_value
));
1930 /* FIXME: cagney/2004-01-17: If extract_returned_value_address
1931 is available and the function is using
1932 RETURN_VALUE_STRUCT_CONVENTION, should use it to find the
1933 address of the returned value so that it can be assigned. */
1936 gdb_assert (gdbarch_return_value (current_gdbarch
, return_type
,
1938 == RETURN_VALUE_REGISTER_CONVENTION
);
1939 gdbarch_return_value (current_gdbarch
, return_type
,
1940 current_regcache
, NULL
/*read*/,
1941 VALUE_CONTENTS (return_value
) /*write*/);
1945 /* If we are at the end of a call dummy now, pop the dummy frame
1947 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1948 frame_pop (get_current_frame ());
1950 /* If interactive, print the frame that is now current. */
1952 frame_command ("0", 1);
1954 select_frame_command ("0", 0);
1957 /* Sets the scope to input function name, provided that the
1958 function is within the current stack frame */
1960 struct function_bounds
1962 CORE_ADDR low
, high
;
1965 static void func_command (char *arg
, int from_tty
);
1967 func_command (char *arg
, int from_tty
)
1969 struct frame_info
*fp
;
1971 struct symtabs_and_lines sals
;
1974 struct function_bounds
*func_bounds
= (struct function_bounds
*) NULL
;
1976 if (arg
!= (char *) NULL
)
1979 fp
= parse_frame_specification ("0");
1980 sals
= decode_line_spec (arg
, 1);
1981 func_bounds
= (struct function_bounds
*) xmalloc (
1982 sizeof (struct function_bounds
) * sals
.nelts
);
1983 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1985 if (sals
.sals
[i
].pc
== (CORE_ADDR
) 0 ||
1986 find_pc_partial_function (sals
.sals
[i
].pc
,
1988 &func_bounds
[i
].low
,
1989 &func_bounds
[i
].high
) == 0)
1991 func_bounds
[i
].low
=
1992 func_bounds
[i
].high
= (CORE_ADDR
) NULL
;
1998 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
1999 found
= (get_frame_pc (fp
) >= func_bounds
[i
].low
&&
2000 get_frame_pc (fp
) < func_bounds
[i
].high
);
2004 fp
= find_relative_frame (fp
, &level
);
2007 while (!found
&& level
== 0);
2010 xfree (func_bounds
);
2013 printf_filtered ("'%s' not within current stack frame.\n", arg
);
2014 else if (fp
!= deprecated_selected_frame
)
2015 select_and_print_frame (fp
);
2018 /* Gets the language of the current frame. */
2021 get_frame_language (void)
2024 enum language flang
; /* The language of the current frame */
2026 if (deprecated_selected_frame
)
2028 /* We determine the current frame language by looking up its
2029 associated symtab. To retrieve this symtab, we use the frame PC.
2030 However we cannot use the frame pc as is, because it usually points
2031 to the instruction following the "call", which is sometimes the first
2032 instruction of another function. So we rely on
2033 get_frame_address_in_block(), it provides us with a PC which is
2034 guaranteed to be inside the frame's code block. */
2035 s
= find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame
));
2037 flang
= s
->language
;
2039 flang
= language_unknown
;
2042 flang
= language_unknown
;
2048 _initialize_stack (void)
2051 backtrace_limit
= 30;
2054 add_com ("return", class_stack
, return_command
,
2055 "Make selected stack frame return to its caller.\n\
2056 Control remains in the debugger, but when you continue\n\
2057 execution will resume in the frame above the one now selected.\n\
2058 If an argument is given, it is an expression for the value to return.");
2060 add_com ("up", class_stack
, up_command
,
2061 "Select and print stack frame that called this one.\n\
2062 An argument says how many frames up to go.");
2063 add_com ("up-silently", class_support
, up_silently_command
,
2064 "Same as the `up' command, but does not print anything.\n\
2065 This is useful in command scripts.");
2067 add_com ("down", class_stack
, down_command
,
2068 "Select and print stack frame called by this one.\n\
2069 An argument says how many frames down to go.");
2070 add_com_alias ("do", "down", class_stack
, 1);
2071 add_com_alias ("dow", "down", class_stack
, 1);
2072 add_com ("down-silently", class_support
, down_silently_command
,
2073 "Same as the `down' command, but does not print anything.\n\
2074 This is useful in command scripts.");
2076 add_com ("frame", class_stack
, frame_command
,
2077 "Select and print a stack frame.\n\
2078 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2079 An argument specifies the frame to select.\n\
2080 It can be a stack frame number or the address of the frame.\n\
2081 With argument, nothing is printed if input is coming from\n\
2082 a command file or a user-defined command.");
2084 add_com_alias ("f", "frame", class_stack
, 1);
2088 add_com ("L", class_stack
, current_frame_command
,
2089 "Print the current stack frame.\n");
2090 add_com_alias ("V", "frame", class_stack
, 1);
2092 add_com ("select-frame", class_stack
, select_frame_command
,
2093 "Select a stack frame without printing anything.\n\
2094 An argument specifies the frame to select.\n\
2095 It can be a stack frame number or the address of the frame.\n");
2097 add_com ("backtrace", class_stack
, backtrace_command
,
2098 "Print backtrace of all stack frames, or innermost COUNT frames.\n\
2099 With a negative argument, print outermost -COUNT frames.\n\
2100 Use of the 'full' qualifier also prints the values of the local variables.\n");
2101 add_com_alias ("bt", "backtrace", class_stack
, 0);
2104 add_com_alias ("t", "backtrace", class_stack
, 0);
2105 add_com ("T", class_stack
, backtrace_full_command
,
2106 "Print backtrace of all stack frames, or innermost COUNT frames \n\
2107 and the values of the local variables.\n\
2108 With a negative argument, print outermost -COUNT frames.\n\
2109 Usage: T <count>\n");
2112 add_com_alias ("where", "backtrace", class_alias
, 0);
2113 add_info ("stack", backtrace_command
,
2114 "Backtrace of the stack, or innermost COUNT frames.");
2115 add_info_alias ("s", "stack", 1);
2116 add_info ("frame", frame_info
,
2117 "All about selected stack frame, or frame at ADDR.");
2118 add_info_alias ("f", "frame", 1);
2119 add_info ("locals", locals_info
,
2120 "Local variables of current stack frame.");
2121 add_info ("args", args_info
,
2122 "Argument variables of current stack frame.");
2124 add_com ("l", class_info
, args_plus_locals_info
,
2125 "Argument and local variables of current stack frame.");
2128 add_com ("func", class_stack
, func_command
,
2129 "Select the stack frame that contains <func>.\nUsage: func <name>\n");
2131 add_info ("catch", catch_info
,
2132 "Exceptions that can be caught in the current stack frame.");
2135 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
,
2136 "Specify maximum number of frames for \"backtrace\" to print by default.",
2138 add_info ("backtrace-limit", backtrace_limit_info
,
2139 "The maximum number of frames for \"backtrace\" to print by default.");