1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008,
5 2009 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 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, see <http://www.gnu.org/licenses/>. */
26 #include "expression.h"
33 #include "breakpoint.h"
40 #include "dictionary.h"
41 #include "exceptions.h"
42 #include "reggroups.h"
46 #include "gdbthread.h"
47 #include "cp-support.h"
49 #include "inline-frame.h"
51 #include "gdb_assert.h"
53 #include "gdb_string.h"
55 void (*deprecated_selected_frame_level_changed_hook
) (int);
57 /* The possible choices of "set print frame-arguments, and the value
60 static const char *print_frame_arguments_choices
[] =
61 {"all", "scalars", "none", NULL
};
62 static const char *print_frame_arguments
= "scalars";
64 /* Prototypes for local functions. */
66 static void print_frame_local_vars (struct frame_info
*, int,
69 static void print_frame (struct frame_info
*frame
, int print_level
,
70 enum print_what print_what
, int print_args
,
71 struct symtab_and_line sal
);
73 /* Zero means do things normally; we are interacting directly with the
74 user. One means print the full filename and linenumber when a
75 frame is printed, and do so in a format emacs18/emacs19.22 can
76 parse. Two means print similar annotations, but in many more
77 cases and in a slightly different syntax. */
79 int annotation_level
= 0;
82 struct print_stack_frame_args
84 struct frame_info
*frame
;
86 enum print_what print_what
;
90 /* Show or print the frame arguments; stub for catch_errors. */
93 print_stack_frame_stub (void *args
)
95 struct print_stack_frame_args
*p
= args
;
96 int center
= (p
->print_what
== SRC_LINE
|| p
->print_what
== SRC_AND_LOC
);
98 print_frame_info (p
->frame
, p
->print_level
, p
->print_what
, p
->print_args
);
99 set_current_sal_from_frame (p
->frame
, center
);
103 /* Return 1 if we should display the address in addition to the location,
104 because we are in the middle of a statement. */
107 frame_show_address (struct frame_info
*frame
,
108 struct symtab_and_line sal
)
110 /* If there is a line number, but no PC, then there is no location
111 information associated with this sal. The only way that should
112 happen is for the call sites of inlined functions (SAL comes from
113 find_frame_sal). Otherwise, we would have some PC range if the
114 SAL came from a line table. */
115 if (sal
.line
!= 0 && sal
.pc
== 0 && sal
.end
== 0)
117 if (get_next_frame (frame
) == NULL
)
118 gdb_assert (inline_skipped_frames (inferior_ptid
) > 0);
120 gdb_assert (get_frame_type (get_next_frame (frame
)) == INLINE_FRAME
);
124 return get_frame_pc (frame
) != sal
.pc
;
127 /* Show or print a stack frame FRAME briefly. The output is format
128 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
129 relative level, function name, argument list, and file name and
130 line number. If the frame's PC is not at the beginning of the
131 source line, the actual PC is printed at the beginning. */
134 print_stack_frame (struct frame_info
*frame
, int print_level
,
135 enum print_what print_what
)
137 struct print_stack_frame_args args
;
140 args
.print_level
= print_level
;
141 args
.print_what
= print_what
;
142 /* For mi, alway print location and address. */
143 args
.print_what
= ui_out_is_mi_like_p (uiout
) ? LOC_AND_ADDRESS
: print_what
;
146 catch_errors (print_stack_frame_stub
, &args
, "", RETURN_MASK_ERROR
);
149 struct print_args_args
152 struct frame_info
*frame
;
153 struct ui_file
*stream
;
156 static int print_args_stub (void *args
);
158 /* Print nameless arguments of frame FRAME on STREAM, where START is
159 the offset of the first nameless argument, and NUM is the number of
160 nameless arguments to print. FIRST is nonzero if this is the first
161 argument (not just the first nameless argument). */
164 print_frame_nameless_args (struct frame_info
*frame
, long start
, int num
,
165 int first
, struct ui_file
*stream
)
171 for (i
= 0; i
< num
; i
++)
174 argsaddr
= get_frame_args_address (frame
);
177 arg_value
= read_memory_integer (argsaddr
+ start
, sizeof (int));
179 fprintf_filtered (stream
, ", ");
180 fprintf_filtered (stream
, "%ld", arg_value
);
182 start
+= sizeof (int);
186 /* Print the arguments of frame FRAME on STREAM, given the function
187 FUNC running in that frame (as a symbol), where NUM is the number
188 of arguments according to the stack frame (or -1 if the number of
189 arguments is unknown). */
191 /* Note that currently the "number of arguments according to the
192 stack frame" is only known on VAX where i refers to the "number of
193 ints of arguments according to the stack frame". */
196 print_frame_args (struct symbol
*func
, struct frame_info
*frame
,
197 int num
, struct ui_file
*stream
)
200 /* Offset of next stack argument beyond the one we have seen that is
201 at the highest offset, or -1 if we haven't come to a stack
203 long highest_offset
= -1;
204 /* Number of ints of arguments that we have printed so far. */
205 int args_printed
= 0;
206 struct cleanup
*old_chain
, *list_chain
;
207 struct ui_stream
*stb
;
208 /* True if we should print arguments, false otherwise. */
209 int print_args
= strcmp (print_frame_arguments
, "none");
210 /* True in "summary" mode, false otherwise. */
211 int summary
= !strcmp (print_frame_arguments
, "scalars");
213 stb
= ui_out_stream_new (uiout
);
214 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
218 struct block
*b
= SYMBOL_BLOCK_VALUE (func
);
219 struct dict_iterator iter
;
223 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
227 /* Keep track of the highest stack argument offset seen, and
228 skip over any kinds of symbols we don't care about. */
230 if (!SYMBOL_IS_ARGUMENT (sym
))
233 switch (SYMBOL_CLASS (sym
))
238 long current_offset
= SYMBOL_VALUE (sym
);
239 int arg_size
= TYPE_LENGTH (SYMBOL_TYPE (sym
));
241 /* Compute address of next argument by adding the size of
242 this argument and rounding to an int boundary. */
244 ((current_offset
+ arg_size
+ sizeof (int) - 1)
245 & ~(sizeof (int) - 1));
247 /* If this is the highest offset seen yet, set
249 if (highest_offset
== -1
250 || (current_offset
> highest_offset
))
251 highest_offset
= current_offset
;
253 /* Add the number of ints we're about to print to
255 args_printed
+= (arg_size
+ sizeof (int) - 1) / sizeof (int);
258 /* We care about types of symbols, but don't need to
259 keep track of stack offsets in them. */
261 case LOC_REGPARM_ADDR
:
263 case LOC_OPTIMIZED_OUT
:
268 /* We have to look up the symbol because arguments can have
269 two entries (one a parameter, one a local) and the one we
270 want is the local, which lookup_symbol will find for us.
271 This includes gcc1 (not gcc2) on SPARC when passing a
272 small structure and gcc2 when the argument type is float
273 and it is passed as a double and converted to float by
274 the prologue (in the latter case the type of the LOC_ARG
275 symbol is double and the type of the LOC_LOCAL symbol is
277 /* But if the parameter name is null, don't try it. Null
278 parameter names occur on the RS/6000, for traceback
279 tables. FIXME, should we even print them? */
281 if (*SYMBOL_LINKAGE_NAME (sym
))
284 nsym
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
),
285 b
, VAR_DOMAIN
, NULL
);
286 gdb_assert (nsym
!= NULL
);
287 if (SYMBOL_CLASS (nsym
) == LOC_REGISTER
288 && !SYMBOL_IS_ARGUMENT (nsym
))
290 /* There is a LOC_ARG/LOC_REGISTER pair. This means
291 that it was passed on the stack and loaded into a
292 register, or passed in a register and stored in a
293 stack slot. GDB 3.x used the LOC_ARG; GDB
294 4.0-4.11 used the LOC_REGISTER.
296 Reasons for using the LOC_ARG:
298 (1) Because find_saved_registers may be slow for
301 (2) Because registers are often re-used and stack
302 slots rarely (never?) are. Therefore using
303 the stack slot is much less likely to print
306 Reasons why we might want to use the LOC_REGISTER:
308 (1) So that the backtrace prints the same value
309 as "print foo". I see no compelling reason
310 why this needs to be the case; having the
311 backtrace print the value which was passed
312 in, and "print foo" print the value as
313 modified within the called function, makes
316 Additional note: It might be nice if "info args"
317 displayed both values.
319 One more note: There is a case with SPARC
320 structure passing where we need to use the
321 LOC_REGISTER, but this is dealt with by creating
322 a single LOC_REGPARM in symbol reading. */
324 /* Leave sym (the LOC_ARG) alone. */
331 /* Print the current arg. */
333 ui_out_text (uiout
, ", ");
334 ui_out_wrap_hint (uiout
, " ");
336 annotate_arg_begin ();
338 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, NULL
);
339 fprintf_symbol_filtered (stb
->stream
, SYMBOL_PRINT_NAME (sym
),
340 SYMBOL_LANGUAGE (sym
),
341 DMGL_PARAMS
| DMGL_ANSI
);
342 ui_out_field_stream (uiout
, "name", stb
);
343 annotate_arg_name_end ();
344 ui_out_text (uiout
, "=");
348 /* Avoid value_print because it will deref ref parameters.
349 We just want to print their addresses. Print ??? for
350 args whose address we do not know. We pass 2 as
351 "recurse" to val_print because our standard indentation
352 here is 4 spaces, and val_print indents 2 for each
354 val
= read_var_value (sym
, frame
);
356 annotate_arg_value (val
== NULL
? NULL
: value_type (val
));
360 const struct language_defn
*language
;
361 struct value_print_options opts
;
363 /* Use the appropriate language to display our symbol,
364 unless the user forced the language to a specific
366 if (language_mode
== language_mode_auto
)
367 language
= language_def (SYMBOL_LANGUAGE (sym
));
369 language
= current_language
;
371 get_raw_print_options (&opts
);
373 opts
.summary
= summary
;
374 common_val_print (val
, stb
->stream
, 2, &opts
, language
);
375 ui_out_field_stream (uiout
, "value", stb
);
378 ui_out_text (uiout
, "???");
381 ui_out_text (uiout
, "...");
384 /* Invoke ui_out_tuple_end. */
385 do_cleanups (list_chain
);
393 /* Don't print nameless args in situations where we don't know
394 enough about the stack to find them. */
399 if (highest_offset
== -1)
400 start
= gdbarch_frame_args_skip (get_frame_arch (frame
));
402 start
= highest_offset
;
404 print_frame_nameless_args (frame
, start
, num
- args_printed
,
408 do_cleanups (old_chain
);
411 /* Stub for catch_errors. */
414 print_args_stub (void *args
)
416 struct print_args_args
*p
= args
;
417 struct gdbarch
*gdbarch
= get_frame_arch (p
->frame
);
420 if (gdbarch_frame_num_args_p (gdbarch
))
422 numargs
= gdbarch_frame_num_args (gdbarch
, p
->frame
);
423 gdb_assert (numargs
>= 0);
427 print_frame_args (p
->func
, p
->frame
, numargs
, p
->stream
);
431 /* Set the current source and line to the location given by frame
432 FRAME, if possible. When CENTER is true, adjust so the relevant
433 line is in the center of the next 'list'. */
436 set_current_sal_from_frame (struct frame_info
*frame
, int center
)
438 struct symtab_and_line sal
;
440 find_frame_sal (frame
, &sal
);
444 sal
.line
= max (sal
.line
- get_lines_to_list () / 2, 1);
445 set_current_source_symtab_and_line (&sal
);
449 /* If ON, GDB will display disassembly of the next source line when
450 execution of the program being debugged stops.
451 If AUTO (which is the default), or there's no line info to determine
452 the source line of the next instruction, display disassembly of next
453 instruction instead. */
455 static enum auto_boolean disassemble_next_line
;
458 show_disassemble_next_line (struct ui_file
*file
, int from_tty
,
459 struct cmd_list_element
*c
,
462 fprintf_filtered (file
, _("\
463 Debugger's willingness to use disassemble-next-line is %s.\n"),
467 /* Show assembly codes; stub for catch_errors. */
469 struct gdb_disassembly_stub_args
477 gdb_disassembly_stub (void *args
)
479 struct gdb_disassembly_stub_args
*p
= args
;
480 gdb_disassembly (uiout
, 0, 0, p
->how_many
, p
->low
, p
->high
);
483 /* Use TRY_CATCH to catch the exception from the gdb_disassembly
484 because it will be broken by filter sometime. */
487 do_gdb_disassembly (int how_many
, CORE_ADDR low
, CORE_ADDR high
)
489 volatile struct gdb_exception exception
;
490 struct gdb_disassembly_stub_args args
;
492 args
.how_many
= how_many
;
495 TRY_CATCH (exception
, RETURN_MASK_ALL
)
497 gdb_disassembly_stub (&args
);
499 /* If an exception was thrown while doing the disassembly, print
500 the error message, to give the user a clue of what happened. */
501 if (exception
.reason
== RETURN_ERROR
)
502 exception_print (gdb_stderr
, exception
);
505 /* Print information about frame FRAME. The output is format according
506 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
509 SRC_LINE: Print only source line.
510 LOCATION: Print only location.
511 LOC_AND_SRC: Print location and source line.
513 Used in "where" output, and to emit breakpoint or step
517 print_frame_info (struct frame_info
*frame
, int print_level
,
518 enum print_what print_what
, int print_args
)
520 struct symtab_and_line sal
;
524 if (get_frame_type (frame
) == DUMMY_FRAME
525 || get_frame_type (frame
) == SIGTRAMP_FRAME
526 || get_frame_type (frame
) == ARCH_FRAME
)
528 struct cleanup
*uiout_cleanup
529 = make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
531 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
532 get_frame_pc (frame
));
534 /* Do this regardless of SOURCE because we don't have any source
535 to list for this frame. */
538 ui_out_text (uiout
, "#");
539 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
540 frame_relative_level (frame
));
542 if (ui_out_is_mi_like_p (uiout
))
544 annotate_frame_address ();
545 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
546 annotate_frame_address_end ();
549 if (get_frame_type (frame
) == DUMMY_FRAME
)
551 annotate_function_call ();
552 ui_out_field_string (uiout
, "func", "<function called from gdb>");
554 else if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
556 annotate_signal_handler_caller ();
557 ui_out_field_string (uiout
, "func", "<signal handler called>");
559 else if (get_frame_type (frame
) == ARCH_FRAME
)
561 ui_out_field_string (uiout
, "func", "<cross-architecture call>");
563 ui_out_text (uiout
, "\n");
564 annotate_frame_end ();
566 do_cleanups (uiout_cleanup
);
570 /* If FRAME is not the innermost frame, that normally means that
571 FRAME->pc points to *after* the call instruction, and we want to
572 get the line containing the call, never the next line. But if
573 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
574 next frame was not entered as the result of a call, and we want
575 to get the line containing FRAME->pc. */
576 find_frame_sal (frame
, &sal
);
578 location_print
= (print_what
== LOCATION
579 || print_what
== LOC_AND_ADDRESS
580 || print_what
== SRC_AND_LOC
);
582 if (location_print
|| !sal
.symtab
)
583 print_frame (frame
, print_level
, print_what
, print_args
, sal
);
585 source_print
= (print_what
== SRC_LINE
|| print_what
== SRC_AND_LOC
);
587 /* If disassemble-next-line is set to auto or on and doesn't have
588 the line debug messages for $pc, output the next instruction. */
589 if ((disassemble_next_line
== AUTO_BOOLEAN_AUTO
590 || disassemble_next_line
== AUTO_BOOLEAN_TRUE
)
591 && source_print
&& !sal
.symtab
)
592 do_gdb_disassembly (1, get_frame_pc (frame
), get_frame_pc (frame
) + 1);
594 if (source_print
&& sal
.symtab
)
597 int mid_statement
= ((print_what
== SRC_LINE
)
598 && frame_show_address (frame
, sal
));
600 if (annotation_level
)
601 done
= identify_source_line (sal
.symtab
, sal
.line
, mid_statement
,
602 get_frame_pc (frame
));
605 if (deprecated_print_frame_info_listing_hook
)
606 deprecated_print_frame_info_listing_hook (sal
.symtab
,
611 struct value_print_options opts
;
612 get_user_print_options (&opts
);
613 /* We used to do this earlier, but that is clearly
614 wrong. This function is used by many different
615 parts of gdb, including normal_stop in infrun.c,
616 which uses this to print out the current PC
617 when we stepi/nexti into the middle of a source
618 line. Only the command line really wants this
619 behavior. Other UIs probably would like the
620 ability to decide for themselves if it is desired. */
621 if (opts
.addressprint
&& mid_statement
)
623 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
624 ui_out_text (uiout
, "\t");
627 print_source_lines (sal
.symtab
, sal
.line
, sal
.line
+ 1, 0);
631 /* If disassemble-next-line is set to on and there is line debug
632 messages, output assembly codes for next line. */
633 if (disassemble_next_line
== AUTO_BOOLEAN_TRUE
)
634 do_gdb_disassembly (-1, get_frame_pc (frame
), sal
.end
);
637 if (print_what
!= LOCATION
)
638 set_default_breakpoint (1, get_frame_pc (frame
), sal
.symtab
, sal
.line
);
640 annotate_frame_end ();
642 gdb_flush (gdb_stdout
);
645 /* Attempt to obtain the FUNNAME and FUNLANG of the function corresponding
648 find_frame_funname (struct frame_info
*frame
, char **funname
,
649 enum language
*funlang
)
654 *funlang
= language_unknown
;
656 func
= get_frame_function (frame
);
659 /* In certain pathological cases, the symtabs give the wrong
660 function (when we are in the first function in a file which
661 is compiled without debugging symbols, the previous function
662 is compiled with debugging symbols, and the "foo.o" symbol
663 that is supposed to tell us where the file with debugging
664 symbols ends has been truncated by ar because it is longer
665 than 15 characters). This also occurs if the user uses asm()
666 to create a function but not stabs for it (in a file compiled
669 So look in the minimal symbol tables as well, and if it comes
670 up with a larger address for the function use that instead.
671 I don't think this can ever cause any problems; there
672 shouldn't be any minimal symbols in the middle of a function;
673 if this is ever changed many parts of GDB will need to be
674 changed (and we'll create a find_pc_minimal_function or some
677 struct minimal_symbol
*msymbol
= NULL
;
679 /* Don't attempt to do this for inlined functions, which do not
680 have a corresponding minimal symbol. */
681 if (!block_inlined_p (SYMBOL_BLOCK_VALUE (func
)))
683 = lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
686 && (SYMBOL_VALUE_ADDRESS (msymbol
)
687 > BLOCK_START (SYMBOL_BLOCK_VALUE (func
))))
689 /* We also don't know anything about the function besides
690 its address and name. */
692 *funname
= SYMBOL_PRINT_NAME (msymbol
);
693 *funlang
= SYMBOL_LANGUAGE (msymbol
);
697 *funname
= SYMBOL_PRINT_NAME (func
);
698 *funlang
= SYMBOL_LANGUAGE (func
);
699 if (*funlang
== language_cplus
)
701 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
702 to display the demangled name that we already have
703 stored in the symbol table, but we stored a version
704 with DMGL_PARAMS turned on, and here we don't want to
705 display parameters. So remove the parameters. */
706 char *func_only
= cp_remove_params (*funname
);
709 *funname
= func_only
;
710 make_cleanup (xfree
, func_only
);
717 struct minimal_symbol
*msymbol
=
718 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame
));
722 *funname
= SYMBOL_PRINT_NAME (msymbol
);
723 *funlang
= SYMBOL_LANGUAGE (msymbol
);
729 print_frame (struct frame_info
*frame
, int print_level
,
730 enum print_what print_what
, int print_args
,
731 struct symtab_and_line sal
)
733 char *funname
= NULL
;
734 enum language funlang
= language_unknown
;
735 struct ui_stream
*stb
;
736 struct cleanup
*old_chain
, *list_chain
;
737 struct value_print_options opts
;
739 stb
= ui_out_stream_new (uiout
);
740 old_chain
= make_cleanup_ui_out_stream_delete (stb
);
742 find_frame_funname (frame
, &funname
, &funlang
);
744 annotate_frame_begin (print_level
? frame_relative_level (frame
) : 0,
745 get_frame_pc (frame
));
747 list_chain
= make_cleanup_ui_out_tuple_begin_end (uiout
, "frame");
751 ui_out_text (uiout
, "#");
752 ui_out_field_fmt_int (uiout
, 2, ui_left
, "level",
753 frame_relative_level (frame
));
755 get_user_print_options (&opts
);
756 if (opts
.addressprint
)
757 if (frame_show_address (frame
, sal
) || !sal
.symtab
758 || print_what
== LOC_AND_ADDRESS
)
760 annotate_frame_address ();
761 ui_out_field_core_addr (uiout
, "addr", get_frame_pc (frame
));
762 annotate_frame_address_end ();
763 ui_out_text (uiout
, " in ");
765 annotate_frame_function_name ();
766 fprintf_symbol_filtered (stb
->stream
, funname
? funname
: "??",
768 ui_out_field_stream (uiout
, "func", stb
);
769 ui_out_wrap_hint (uiout
, " ");
770 annotate_frame_args ();
772 ui_out_text (uiout
, " (");
775 struct print_args_args args
;
776 struct cleanup
*args_list_chain
;
778 args
.func
= find_pc_function (get_frame_address_in_block (frame
));
779 args
.stream
= gdb_stdout
;
780 args_list_chain
= make_cleanup_ui_out_list_begin_end (uiout
, "args");
781 catch_errors (print_args_stub
, &args
, "", RETURN_MASK_ERROR
);
782 /* FIXME: ARGS must be a list. If one argument is a string it
783 will have " that will not be properly escaped. */
784 /* Invoke ui_out_tuple_end. */
785 do_cleanups (args_list_chain
);
788 ui_out_text (uiout
, ")");
789 if (sal
.symtab
&& sal
.symtab
->filename
)
791 annotate_frame_source_begin ();
792 ui_out_wrap_hint (uiout
, " ");
793 ui_out_text (uiout
, " at ");
794 annotate_frame_source_file ();
795 ui_out_field_string (uiout
, "file", sal
.symtab
->filename
);
796 if (ui_out_is_mi_like_p (uiout
))
798 const char *fullname
= symtab_to_fullname (sal
.symtab
);
799 if (fullname
!= NULL
)
800 ui_out_field_string (uiout
, "fullname", fullname
);
802 annotate_frame_source_file_end ();
803 ui_out_text (uiout
, ":");
804 annotate_frame_source_line ();
805 ui_out_field_int (uiout
, "line", sal
.line
);
806 annotate_frame_source_end ();
809 if (!funname
|| (!sal
.symtab
|| !sal
.symtab
->filename
))
812 char *lib
= PC_SOLIB (get_frame_pc (frame
));
814 char *lib
= solib_name_from_address (get_frame_pc (frame
));
818 annotate_frame_where ();
819 ui_out_wrap_hint (uiout
, " ");
820 ui_out_text (uiout
, " from ");
821 ui_out_field_string (uiout
, "from", lib
);
825 /* do_cleanups will call ui_out_tuple_end() for us. */
826 do_cleanups (list_chain
);
827 ui_out_text (uiout
, "\n");
828 do_cleanups (old_chain
);
832 /* Read a frame specification in whatever the appropriate format is
833 from FRAME_EXP. Call error(), printing MESSAGE, if the
834 specification is in any way invalid (so this function never returns
835 NULL). When SEPECTED_P is non-NULL set its target to indicate that
836 the default selected frame was used. */
838 static struct frame_info
*
839 parse_frame_specification_1 (const char *frame_exp
, const char *message
,
840 int *selected_frame_p
)
843 struct value
*args
[4];
844 CORE_ADDR addrs
[ARRAY_SIZE (args
)];
846 if (frame_exp
== NULL
)
851 struct cleanup
*tmp_cleanup
;
857 struct cleanup
*cleanup
;
860 /* Skip leading white space, bail of EOL. */
861 while (isspace (*frame_exp
))
866 /* Parse the argument, extract it, save it. */
870 addr_string
= savestring (frame_exp
, p
- frame_exp
);
872 cleanup
= make_cleanup (xfree
, addr_string
);
874 /* NOTE: Parse and evaluate expression, but do not use
875 functions such as parse_and_eval_long or
876 parse_and_eval_address to also extract the value.
877 Instead value_as_long and value_as_address are used.
878 This avoids problems with expressions that contain
880 if (numargs
>= ARRAY_SIZE (args
))
881 error (_("Too many args in frame specification"));
882 args
[numargs
++] = parse_and_eval (addr_string
);
884 do_cleanups (cleanup
);
888 /* If no args, default to the selected frame. */
891 if (selected_frame_p
!= NULL
)
892 (*selected_frame_p
) = 1;
893 return get_selected_frame (message
);
896 /* None of the remaining use the selected frame. */
897 if (selected_frame_p
!= NULL
)
898 (*selected_frame_p
) = 0;
900 /* Assume the single arg[0] is an integer, and try using that to
901 select a frame relative to current. */
904 struct frame_info
*fid
;
905 int level
= value_as_long (args
[0]);
906 fid
= find_relative_frame (get_current_frame (), &level
);
908 /* find_relative_frame was successful */
912 /* Convert each value into a corresponding address. */
915 for (i
= 0; i
< numargs
; i
++)
916 addrs
[i
] = value_as_address (args
[i
]);
919 /* Assume that the single arg[0] is an address, use that to identify
920 a frame with a matching ID. Should this also accept stack/pc or
924 struct frame_id id
= frame_id_build_wild (addrs
[0]);
925 struct frame_info
*fid
;
927 /* If (s)he specifies the frame with an address, he deserves
928 what (s)he gets. Still, give the highest one that matches.
929 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
931 for (fid
= get_current_frame ();
933 fid
= get_prev_frame (fid
))
935 if (frame_id_eq (id
, get_frame_id (fid
)))
937 struct frame_info
*prev_frame
;
941 prev_frame
= get_prev_frame (fid
);
943 || !frame_id_eq (id
, get_frame_id (prev_frame
)))
952 /* We couldn't identify the frame as an existing frame, but
953 perhaps we can create one with a single argument. */
955 return create_new_frame (addrs
[0], 0);
956 else if (numargs
== 2)
957 return create_new_frame (addrs
[0], addrs
[1]);
959 error (_("Too many args in frame specification"));
962 static struct frame_info
*
963 parse_frame_specification (char *frame_exp
)
965 return parse_frame_specification_1 (frame_exp
, NULL
, NULL
);
968 /* Print verbosely the selected frame or the frame at address
969 ADDR_EXP. Absolutely all information in the frame is printed. */
972 frame_info (char *addr_exp
, int from_tty
)
974 struct frame_info
*fi
;
975 struct symtab_and_line sal
;
978 struct frame_info
*calling_frame_info
;
979 int i
, count
, numregs
;
981 enum language funlang
= language_unknown
;
982 const char *pc_regname
;
983 int selected_frame_p
;
984 struct gdbarch
*gdbarch
;
985 struct cleanup
*back_to
= make_cleanup (null_cleanup
, NULL
);
987 fi
= parse_frame_specification_1 (addr_exp
, "No stack.", &selected_frame_p
);
988 gdbarch
= get_frame_arch (fi
);
990 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
991 is not a good name. */
992 if (gdbarch_pc_regnum (gdbarch
) >= 0)
993 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
994 easily not match that of the internal value returned by
996 pc_regname
= gdbarch_register_name (gdbarch
, gdbarch_pc_regnum (gdbarch
));
998 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
999 architectures will often have a hardware register called "pc",
1000 and that register's value, again, can easily not match
1004 find_frame_sal (fi
, &sal
);
1005 func
= get_frame_function (fi
);
1006 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
1008 s
= find_pc_symtab (get_frame_pc (fi
));
1011 funname
= SYMBOL_PRINT_NAME (func
);
1012 funlang
= SYMBOL_LANGUAGE (func
);
1013 if (funlang
== language_cplus
)
1015 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
1016 to display the demangled name that we already have
1017 stored in the symbol table, but we stored a version
1018 with DMGL_PARAMS turned on, and here we don't want to
1019 display parameters. So remove the parameters. */
1020 char *func_only
= cp_remove_params (funname
);
1023 funname
= func_only
;
1024 make_cleanup (xfree
, func_only
);
1030 struct minimal_symbol
*msymbol
;
1032 msymbol
= lookup_minimal_symbol_by_pc (get_frame_pc (fi
));
1033 if (msymbol
!= NULL
)
1035 funname
= SYMBOL_PRINT_NAME (msymbol
);
1036 funlang
= SYMBOL_LANGUAGE (msymbol
);
1039 calling_frame_info
= get_prev_frame (fi
);
1041 if (selected_frame_p
&& frame_relative_level (fi
) >= 0)
1043 printf_filtered (_("Stack level %d, frame at "),
1044 frame_relative_level (fi
));
1048 printf_filtered (_("Stack frame at "));
1050 fputs_filtered (paddress (get_frame_base (fi
)), gdb_stdout
);
1051 printf_filtered (":\n");
1052 printf_filtered (" %s = ", pc_regname
);
1053 fputs_filtered (paddress (get_frame_pc (fi
)), gdb_stdout
);
1058 printf_filtered (" in ");
1059 fprintf_symbol_filtered (gdb_stdout
, funname
, funlang
,
1060 DMGL_ANSI
| DMGL_PARAMS
);
1064 printf_filtered (" (%s:%d)", sal
.symtab
->filename
, sal
.line
);
1065 puts_filtered ("; ");
1067 printf_filtered ("saved %s ", pc_regname
);
1068 fputs_filtered (paddress (frame_unwind_caller_pc (fi
)), gdb_stdout
);
1069 printf_filtered ("\n");
1071 if (calling_frame_info
== NULL
)
1073 enum unwind_stop_reason reason
;
1075 reason
= get_frame_unwind_stop_reason (fi
);
1076 if (reason
!= UNWIND_NO_REASON
)
1077 printf_filtered (_(" Outermost frame: %s\n"),
1078 frame_stop_reason_string (reason
));
1080 else if (get_frame_type (fi
) == INLINE_FRAME
)
1081 printf_filtered (" inlined into frame %d",
1082 frame_relative_level (get_prev_frame (fi
)));
1085 printf_filtered (" called by frame at ");
1086 fputs_filtered (paddress (get_frame_base (calling_frame_info
)),
1089 if (get_next_frame (fi
) && calling_frame_info
)
1090 puts_filtered (",");
1092 if (get_next_frame (fi
))
1094 printf_filtered (" caller of frame at ");
1095 fputs_filtered (paddress (get_frame_base (get_next_frame (fi
))),
1098 if (get_next_frame (fi
) || calling_frame_info
)
1099 puts_filtered ("\n");
1102 printf_filtered (" source language %s.\n",
1103 language_str (s
->language
));
1106 /* Address of the argument list for this frame, or 0. */
1107 CORE_ADDR arg_list
= get_frame_args_address (fi
);
1108 /* Number of args for this frame, or -1 if unknown. */
1112 printf_filtered (" Arglist at unknown address.\n");
1115 printf_filtered (" Arglist at ");
1116 fputs_filtered (paddress (arg_list
), gdb_stdout
);
1117 printf_filtered (",");
1119 if (!gdbarch_frame_num_args_p (gdbarch
))
1122 puts_filtered (" args: ");
1126 numargs
= gdbarch_frame_num_args (gdbarch
, fi
);
1127 gdb_assert (numargs
>= 0);
1129 puts_filtered (" no args.");
1130 else if (numargs
== 1)
1131 puts_filtered (" 1 arg: ");
1133 printf_filtered (" %d args: ", numargs
);
1135 print_frame_args (func
, fi
, numargs
, gdb_stdout
);
1136 puts_filtered ("\n");
1140 /* Address of the local variables for this frame, or 0. */
1141 CORE_ADDR arg_list
= get_frame_locals_address (fi
);
1144 printf_filtered (" Locals at unknown address,");
1147 printf_filtered (" Locals at ");
1148 fputs_filtered (paddress (arg_list
), gdb_stdout
);
1149 printf_filtered (",");
1153 /* Print as much information as possible on the location of all the
1156 enum lval_type lval
;
1164 /* The sp is special; what's displayed isn't the save address, but
1165 the value of the previous frame's sp. This is a legacy thing,
1166 at one stage the frame cached the previous frame's SP instead
1167 of its address, hence it was easiest to just display the cached
1169 if (gdbarch_sp_regnum (gdbarch
) >= 0)
1171 /* Find out the location of the saved stack pointer with out
1172 actually evaluating it. */
1173 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1174 &optimized
, &lval
, &addr
,
1176 if (!optimized
&& lval
== not_lval
)
1178 gdb_byte value
[MAX_REGISTER_SIZE
];
1180 frame_register_unwind (fi
, gdbarch_sp_regnum (gdbarch
),
1181 &optimized
, &lval
, &addr
,
1183 /* NOTE: cagney/2003-05-22: This is assuming that the
1184 stack pointer was packed as an unsigned integer. That
1185 may or may not be valid. */
1186 sp
= extract_unsigned_integer (value
,
1187 register_size (gdbarch
,
1188 gdbarch_sp_regnum (gdbarch
)));
1189 printf_filtered (" Previous frame's sp is ");
1190 fputs_filtered (paddress (sp
), gdb_stdout
);
1191 printf_filtered ("\n");
1194 else if (!optimized
&& lval
== lval_memory
)
1196 printf_filtered (" Previous frame's sp at ");
1197 fputs_filtered (paddress (addr
), gdb_stdout
);
1198 printf_filtered ("\n");
1201 else if (!optimized
&& lval
== lval_register
)
1203 printf_filtered (" Previous frame's sp in %s\n",
1204 gdbarch_register_name (gdbarch
, realnum
));
1207 /* else keep quiet. */
1211 numregs
= gdbarch_num_regs (gdbarch
)
1212 + gdbarch_num_pseudo_regs (gdbarch
);
1213 for (i
= 0; i
< numregs
; i
++)
1214 if (i
!= gdbarch_sp_regnum (gdbarch
)
1215 && gdbarch_register_reggroup_p (gdbarch
, i
, all_reggroup
))
1217 /* Find out the location of the saved register without
1218 fetching the corresponding value. */
1219 frame_register_unwind (fi
, i
, &optimized
, &lval
, &addr
, &realnum
,
1221 /* For moment, only display registers that were saved on the
1223 if (!optimized
&& lval
== lval_memory
)
1226 puts_filtered (" Saved registers:\n ");
1228 puts_filtered (",");
1230 printf_filtered (" %s at ",
1231 gdbarch_register_name (gdbarch
, i
));
1232 fputs_filtered (paddress (addr
), gdb_stdout
);
1236 if (count
|| need_nl
)
1237 puts_filtered ("\n");
1240 do_cleanups (back_to
);
1243 /* Print briefly all stack frames or just the innermost COUNT_EXP
1247 backtrace_command_1 (char *count_exp
, int show_locals
, int from_tty
)
1249 struct frame_info
*fi
;
1252 struct frame_info
*trailing
;
1255 if (!target_has_stack
)
1256 error (_("No stack."));
1258 /* The following code must do two things. First, it must set the
1259 variable TRAILING to the frame from which we should start
1260 printing. Second, it must set the variable count to the number
1261 of frames which we should print, or -1 if all of them. */
1262 trailing
= get_current_frame ();
1264 /* The target can be in a state where there is no valid frames
1265 (e.g., just connected). */
1266 if (trailing
== NULL
)
1267 error (_("No stack."));
1272 count
= parse_and_eval_long (count_exp
);
1275 struct frame_info
*current
;
1280 while (current
&& count
--)
1283 current
= get_prev_frame (current
);
1286 /* Will stop when CURRENT reaches the top of the stack.
1287 TRAILING will be COUNT below it. */
1291 trailing
= get_prev_frame (trailing
);
1292 current
= get_prev_frame (current
);
1304 struct partial_symtab
*ps
;
1306 /* Read in symbols for all of the frames. Need to do this in a
1307 separate pass so that "Reading in symbols for xxx" messages
1308 don't screw up the appearance of the backtrace. Also if
1309 people have strong opinions against reading symbols for
1310 backtrace this may have to be an option. */
1312 for (fi
= trailing
; fi
!= NULL
&& i
--; fi
= get_prev_frame (fi
))
1315 ps
= find_pc_psymtab (get_frame_address_in_block (fi
));
1317 PSYMTAB_TO_SYMTAB (ps
); /* Force syms to come in. */
1321 for (i
= 0, fi
= trailing
; fi
&& count
--; i
++, fi
= get_prev_frame (fi
))
1325 /* Don't use print_stack_frame; if an error() occurs it probably
1326 means further attempts to backtrace would fail (on the other
1327 hand, perhaps the code does or could be fixed to make sure
1328 the frame->prev field gets set to NULL in that case). */
1329 print_frame_info (fi
, 1, LOCATION
, 1);
1331 print_frame_local_vars (fi
, 1, gdb_stdout
);
1333 /* Save the last frame to check for error conditions. */
1337 /* If we've stopped before the end, mention that. */
1339 printf_filtered (_("(More stack frames follow...)\n"));
1341 /* If we've run out of frames, and the reason appears to be an error
1342 condition, print it. */
1343 if (fi
== NULL
&& trailing
!= NULL
)
1345 enum unwind_stop_reason reason
;
1347 reason
= get_frame_unwind_stop_reason (trailing
);
1348 if (reason
> UNWIND_FIRST_ERROR
)
1349 printf_filtered (_("Backtrace stopped: %s\n"),
1350 frame_stop_reason_string (reason
));
1354 struct backtrace_command_args
1361 /* Stub for catch_errors. */
1364 backtrace_command_stub (void *data
)
1366 struct backtrace_command_args
*args
= data
;
1367 backtrace_command_1 (args
->count_exp
, args
->show_locals
, args
->from_tty
);
1372 backtrace_command (char *arg
, int from_tty
)
1374 struct cleanup
*old_chain
= NULL
;
1375 int fulltrace_arg
= -1, arglen
= 0, argc
= 0;
1376 struct backtrace_command_args btargs
;
1383 argv
= gdb_buildargv (arg
);
1384 old_chain
= make_cleanup_freeargv (argv
);
1386 for (i
= 0; argv
[i
]; i
++)
1390 for (j
= 0; j
< strlen (argv
[i
]); j
++)
1391 argv
[i
][j
] = tolower (argv
[i
][j
]);
1393 if (fulltrace_arg
< 0 && subset_compare (argv
[i
], "full"))
1394 fulltrace_arg
= argc
;
1397 arglen
+= strlen (argv
[i
]);
1402 if (fulltrace_arg
>= 0)
1406 arg
= xmalloc (arglen
+ 1);
1407 memset (arg
, 0, arglen
+ 1);
1408 for (i
= 0; i
< (argc
+ 1); i
++)
1410 if (i
!= fulltrace_arg
)
1412 strcat (arg
, argv
[i
]);
1422 btargs
.count_exp
= arg
;
1423 btargs
.show_locals
= (fulltrace_arg
>= 0);
1424 btargs
.from_tty
= from_tty
;
1425 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1427 if (fulltrace_arg
>= 0 && arglen
> 0)
1431 do_cleanups (old_chain
);
1435 backtrace_full_command (char *arg
, int from_tty
)
1437 struct backtrace_command_args btargs
;
1438 btargs
.count_exp
= arg
;
1439 btargs
.show_locals
= 1;
1440 btargs
.from_tty
= from_tty
;
1441 catch_errors (backtrace_command_stub
, &btargs
, "", RETURN_MASK_ERROR
);
1445 /* Print the local variables of a block B active in FRAME on STREAM.
1446 Return 1 if any variables were printed; 0 otherwise. */
1449 print_block_frame_locals (struct block
*b
, struct frame_info
*frame
,
1450 int num_tabs
, struct ui_file
*stream
)
1452 struct dict_iterator iter
;
1454 int values_printed
= 0;
1457 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1459 switch (SYMBOL_CLASS (sym
))
1465 if (SYMBOL_IS_ARGUMENT (sym
))
1468 print_variable_and_value (NULL
, sym
, frame
, stream
, 4 * num_tabs
);
1472 /* Ignore symbols which are not locals. */
1477 return values_printed
;
1480 /* Same, but print labels. */
1483 print_block_frame_labels (struct block
*b
, int *have_default
,
1484 struct ui_file
*stream
)
1486 struct dict_iterator iter
;
1488 int values_printed
= 0;
1490 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1492 if (strcmp (SYMBOL_LINKAGE_NAME (sym
), "default") == 0)
1498 if (SYMBOL_CLASS (sym
) == LOC_LABEL
)
1500 struct symtab_and_line sal
;
1501 struct value_print_options opts
;
1502 sal
= find_pc_line (SYMBOL_VALUE_ADDRESS (sym
), 0);
1504 fputs_filtered (SYMBOL_PRINT_NAME (sym
), stream
);
1505 get_user_print_options (&opts
);
1506 if (opts
.addressprint
)
1508 fprintf_filtered (stream
, " ");
1509 fputs_filtered (paddress (SYMBOL_VALUE_ADDRESS (sym
)), stream
);
1511 fprintf_filtered (stream
, " in file %s, line %d\n",
1512 sal
.symtab
->filename
, sal
.line
);
1516 return values_printed
;
1519 /* Print on STREAM all the local variables in frame FRAME, including
1520 all the blocks active in that frame at its current PC.
1522 Returns 1 if the job was done, or 0 if nothing was printed because
1523 we have no info on the function running in FRAME. */
1526 print_frame_local_vars (struct frame_info
*frame
, int num_tabs
,
1527 struct ui_file
*stream
)
1529 struct block
*block
= get_frame_block (frame
, 0);
1530 int values_printed
= 0;
1534 fprintf_filtered (stream
, "No symbol table info available.\n");
1540 if (print_block_frame_locals (block
, frame
, num_tabs
, stream
))
1542 /* After handling the function's top-level block, stop. Don't
1543 continue to its superblock, the block of per-file symbols.
1544 Also do not continue to the containing function of an inlined
1546 if (BLOCK_FUNCTION (block
))
1548 block
= BLOCK_SUPERBLOCK (block
);
1551 if (!values_printed
)
1552 fprintf_filtered (stream
, _("No locals.\n"));
1555 /* Same, but print labels. */
1558 print_frame_label_vars (struct frame_info
*frame
, int this_level_only
,
1559 struct ui_file
*stream
)
1562 fprintf_filtered (stream
, "print_frame_label_vars disabled.\n");
1564 struct blockvector
*bl
;
1565 struct block
*block
= get_frame_block (frame
, 0);
1566 int values_printed
= 0;
1567 int index
, have_default
= 0;
1568 char *blocks_printed
;
1569 CORE_ADDR pc
= get_frame_pc (frame
);
1573 fprintf_filtered (stream
, "No symbol table info available.\n");
1577 bl
= blockvector_for_pc (BLOCK_END (block
) - 4, &index
);
1578 blocks_printed
= alloca (BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1579 memset (blocks_printed
, 0, BLOCKVECTOR_NBLOCKS (bl
) * sizeof (char));
1583 CORE_ADDR end
= BLOCK_END (block
) - 4;
1586 if (bl
!= blockvector_for_pc (end
, &index
))
1587 error (_("blockvector blotch"));
1588 if (BLOCKVECTOR_BLOCK (bl
, index
) != block
)
1589 error (_("blockvector botch"));
1590 last_index
= BLOCKVECTOR_NBLOCKS (bl
);
1593 /* Don't print out blocks that have gone by. */
1594 while (index
< last_index
1595 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < pc
)
1598 while (index
< last_index
1599 && BLOCK_END (BLOCKVECTOR_BLOCK (bl
, index
)) < end
)
1601 if (blocks_printed
[index
] == 0)
1603 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl
, index
),
1604 &have_default
, stream
))
1606 blocks_printed
[index
] = 1;
1612 if (values_printed
&& this_level_only
)
1615 /* After handling the function's top-level block, stop. Don't
1616 continue to its superblock, the block of per-file symbols.
1617 Also do not continue to the containing function of an inlined
1619 if (BLOCK_FUNCTION (block
))
1621 block
= BLOCK_SUPERBLOCK (block
);
1624 if (!values_printed
&& !this_level_only
)
1625 fprintf_filtered (stream
, _("No catches.\n"));
1630 locals_info (char *args
, int from_tty
)
1632 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1637 catch_info (char *ignore
, int from_tty
)
1639 struct symtab_and_line
*sal
;
1641 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1642 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1647 print_frame_arg_vars (struct frame_info
*frame
, struct ui_file
*stream
)
1649 struct symbol
*func
= get_frame_function (frame
);
1651 struct dict_iterator iter
;
1652 struct symbol
*sym
, *sym2
;
1653 int values_printed
= 0;
1657 fprintf_filtered (stream
, _("No symbol table info available.\n"));
1661 b
= SYMBOL_BLOCK_VALUE (func
);
1662 ALL_BLOCK_SYMBOLS (b
, iter
, sym
)
1664 /* Don't worry about things which aren't arguments. */
1665 if (SYMBOL_IS_ARGUMENT (sym
))
1669 /* We have to look up the symbol because arguments can have
1670 two entries (one a parameter, one a local) and the one we
1671 want is the local, which lookup_symbol will find for us.
1672 This includes gcc1 (not gcc2) on the sparc when passing a
1673 small structure and gcc2 when the argument type is float
1674 and it is passed as a double and converted to float by
1675 the prologue (in the latter case the type of the LOC_ARG
1676 symbol is double and the type of the LOC_LOCAL symbol is
1677 float). There are also LOC_ARG/LOC_REGISTER pairs which
1678 are not combined in symbol-reading. */
1680 sym2
= lookup_symbol (SYMBOL_LINKAGE_NAME (sym
),
1681 b
, VAR_DOMAIN
, NULL
);
1682 print_variable_and_value (SYMBOL_PRINT_NAME (sym
), sym2
,
1687 if (!values_printed
)
1688 fprintf_filtered (stream
, _("No arguments.\n"));
1692 args_info (char *ignore
, int from_tty
)
1694 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1700 args_plus_locals_info (char *ignore
, int from_tty
)
1702 args_info (ignore
, from_tty
);
1703 locals_info (ignore
, from_tty
);
1707 /* Select frame FRAME. Also print the stack frame and show the source
1708 if this is the tui version. */
1710 select_and_print_frame (struct frame_info
*frame
)
1712 select_frame (frame
);
1714 print_stack_frame (frame
, 1, SRC_AND_LOC
);
1717 /* Return the symbol-block in which the selected frame is executing.
1718 Can return zero under various legitimate circumstances.
1720 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1721 code address within the block returned. We use this to decide
1722 which macros are in scope. */
1725 get_selected_block (CORE_ADDR
*addr_in_block
)
1727 if (!has_stack_frames ())
1730 return get_frame_block (get_selected_frame (NULL
), addr_in_block
);
1733 /* Find a frame a certain number of levels away from FRAME.
1734 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1735 Positive means go to earlier frames (up); negative, the reverse.
1736 The int that contains the number of levels is counted toward
1737 zero as the frames for those levels are found.
1738 If the top or bottom frame is reached, that frame is returned,
1739 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1740 how much farther the original request asked to go. */
1743 find_relative_frame (struct frame_info
*frame
, int *level_offset_ptr
)
1745 /* Going up is simple: just call get_prev_frame enough times or
1746 until the initial frame is reached. */
1747 while (*level_offset_ptr
> 0)
1749 struct frame_info
*prev
= get_prev_frame (frame
);
1752 (*level_offset_ptr
)--;
1756 /* Going down is just as simple. */
1757 while (*level_offset_ptr
< 0)
1759 struct frame_info
*next
= get_next_frame (frame
);
1762 (*level_offset_ptr
)++;
1769 /* The "select_frame" command. With no argument this is a NOP.
1770 Select the frame at level LEVEL_EXP if it is a valid level.
1771 Otherwise, treat LEVEL_EXP as an address expression and select it.
1773 See parse_frame_specification for more info on proper frame
1777 select_frame_command (char *level_exp
, int from_tty
)
1779 select_frame (parse_frame_specification_1 (level_exp
, "No stack.", NULL
));
1782 /* The "frame" command. With no argument, print the selected frame
1783 briefly. With an argument, behave like select_frame and then print
1784 the selected frame. */
1787 frame_command (char *level_exp
, int from_tty
)
1789 select_frame_command (level_exp
, from_tty
);
1790 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1793 /* The XDB Compatibility command to print the current frame. */
1796 current_frame_command (char *level_exp
, int from_tty
)
1798 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC
);
1801 /* Select the frame up one or COUNT_EXP stack levels from the
1802 previously selected frame, and print it briefly. */
1805 up_silently_base (char *count_exp
)
1807 struct frame_info
*frame
;
1811 count
= parse_and_eval_long (count_exp
);
1813 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1814 if (count
!= 0 && count_exp
== NULL
)
1815 error (_("Initial frame selected; you cannot go up."));
1816 select_frame (frame
);
1820 up_silently_command (char *count_exp
, int from_tty
)
1822 up_silently_base (count_exp
);
1826 up_command (char *count_exp
, int from_tty
)
1828 up_silently_base (count_exp
);
1829 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1832 /* Select the frame down one or COUNT_EXP stack levels from the previously
1833 selected frame, and print it briefly. */
1836 down_silently_base (char *count_exp
)
1838 struct frame_info
*frame
;
1841 count
= -parse_and_eval_long (count_exp
);
1843 frame
= find_relative_frame (get_selected_frame ("No stack."), &count
);
1844 if (count
!= 0 && count_exp
== NULL
)
1846 /* We only do this if COUNT_EXP is not specified. That way
1847 "down" means to really go down (and let me know if that is
1848 impossible), but "down 9999" can be used to mean go all the
1849 way down without getting an error. */
1851 error (_("Bottom (innermost) frame selected; you cannot go down."));
1854 select_frame (frame
);
1858 down_silently_command (char *count_exp
, int from_tty
)
1860 down_silently_base (count_exp
);
1864 down_command (char *count_exp
, int from_tty
)
1866 down_silently_base (count_exp
);
1867 print_stack_frame (get_selected_frame (NULL
), 1, SRC_AND_LOC
);
1872 return_command (char *retval_exp
, int from_tty
)
1874 struct frame_info
*thisframe
;
1875 struct gdbarch
*gdbarch
;
1876 struct symbol
*thisfun
;
1877 struct value
*return_value
= NULL
;
1878 const char *query_prefix
= "";
1880 thisframe
= get_selected_frame ("No selected frame.");
1881 thisfun
= get_frame_function (thisframe
);
1882 gdbarch
= get_frame_arch (thisframe
);
1884 if (get_frame_type (get_current_frame ()) == INLINE_FRAME
)
1885 error (_("Can not force return from an inlined function."));
1887 /* Compute the return value. If the computation triggers an error,
1888 let it bail. If the return type can't be handled, set
1889 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1893 struct expression
*retval_expr
= parse_expression (retval_exp
);
1894 struct cleanup
*old_chain
= make_cleanup (xfree
, retval_expr
);
1895 struct type
*return_type
= NULL
;
1897 /* Compute the return value. Should the computation fail, this
1898 call throws an error. */
1899 return_value
= evaluate_expression (retval_expr
);
1901 /* Cast return value to the return type of the function. Should
1902 the cast fail, this call throws an error. */
1903 if (thisfun
!= NULL
)
1904 return_type
= TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun
));
1905 if (return_type
== NULL
)
1907 if (retval_expr
->elts
[0].opcode
!= UNOP_CAST
)
1908 error (_("Return value type not available for selected "
1910 "Please use an explicit cast of the value to return."));
1911 return_type
= value_type (return_value
);
1913 do_cleanups (old_chain
);
1914 CHECK_TYPEDEF (return_type
);
1915 return_value
= value_cast (return_type
, return_value
);
1917 /* Make sure the value is fully evaluated. It may live in the
1918 stack frame we're about to pop. */
1919 if (value_lazy (return_value
))
1920 value_fetch_lazy (return_value
);
1922 if (TYPE_CODE (return_type
) == TYPE_CODE_VOID
)
1923 /* If the return-type is "void", don't try to find the
1924 return-value's location. However, do still evaluate the
1925 return expression so that, even when the expression result
1926 is discarded, side effects such as "return i++" still
1928 return_value
= NULL
;
1929 else if (thisfun
!= NULL
1930 && using_struct_return (gdbarch
,
1931 SYMBOL_TYPE (thisfun
), return_type
))
1934 The location at which to store the function's return value is unknown.\n\
1935 If you continue, the return value that you specified will be ignored.\n";
1936 return_value
= NULL
;
1940 /* Does an interactive user really want to do this? Include
1941 information, such as how well GDB can handle the return value, in
1942 the query message. */
1946 if (thisfun
== NULL
)
1947 confirmed
= query (_("%sMake selected stack frame return now? "),
1950 confirmed
= query (_("%sMake %s return now? "), query_prefix
,
1951 SYMBOL_PRINT_NAME (thisfun
));
1953 error (_("Not confirmed"));
1956 /* Discard the selected frame and all frames inner-to it. */
1957 frame_pop (get_selected_frame (NULL
));
1959 /* Store RETURN_VALUE in the just-returned register set. */
1960 if (return_value
!= NULL
)
1962 struct type
*return_type
= value_type (return_value
);
1963 struct gdbarch
*gdbarch
= get_regcache_arch (get_current_regcache ());
1964 struct type
*func_type
= thisfun
== NULL
? NULL
: SYMBOL_TYPE (thisfun
);
1966 gdb_assert (gdbarch_return_value (gdbarch
, func_type
, return_type
, NULL
,
1968 == RETURN_VALUE_REGISTER_CONVENTION
);
1969 gdbarch_return_value (gdbarch
, func_type
, return_type
,
1970 get_current_regcache (), NULL
/*read*/,
1971 value_contents (return_value
) /*write*/);
1974 /* If we are at the end of a call dummy now, pop the dummy frame
1976 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME
)
1977 frame_pop (get_current_frame ());
1979 /* If interactive, print the frame that is now current. */
1981 frame_command ("0", 1);
1983 select_frame_command ("0", 0);
1986 /* Sets the scope to input function name, provided that the function
1987 is within the current stack frame */
1989 struct function_bounds
1991 CORE_ADDR low
, high
;
1995 func_command (char *arg
, int from_tty
)
1997 struct frame_info
*frame
;
1999 struct symtabs_and_lines sals
;
2002 struct function_bounds
*func_bounds
= NULL
;
2007 frame
= parse_frame_specification ("0");
2008 sals
= decode_line_spec (arg
, 1);
2009 func_bounds
= (struct function_bounds
*) xmalloc (
2010 sizeof (struct function_bounds
) * sals
.nelts
);
2011 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
2013 if (sals
.sals
[i
].pc
== 0
2014 || find_pc_partial_function (sals
.sals
[i
].pc
, NULL
,
2015 &func_bounds
[i
].low
,
2016 &func_bounds
[i
].high
) == 0)
2018 func_bounds
[i
].low
= func_bounds
[i
].high
= 0;
2024 for (i
= 0; (i
< sals
.nelts
&& !found
); i
++)
2025 found
= (get_frame_pc (frame
) >= func_bounds
[i
].low
2026 && get_frame_pc (frame
) < func_bounds
[i
].high
);
2030 frame
= find_relative_frame (frame
, &level
);
2033 while (!found
&& level
== 0);
2036 xfree (func_bounds
);
2039 printf_filtered (_("'%s' not within current stack frame.\n"), arg
);
2040 else if (frame
!= get_selected_frame (NULL
))
2041 select_and_print_frame (frame
);
2044 /* Gets the language of the current frame. */
2047 get_frame_language (void)
2049 struct frame_info
*frame
= deprecated_safe_get_selected_frame ();
2053 /* We determine the current frame language by looking up its
2054 associated symtab. To retrieve this symtab, we use the frame
2055 PC. However we cannot use the frame PC as is, because it
2056 usually points to the instruction following the "call", which
2057 is sometimes the first instruction of another function. So
2058 we rely on get_frame_address_in_block(), it provides us with
2059 a PC that is guaranteed to be inside the frame's code
2061 CORE_ADDR pc
= get_frame_address_in_block (frame
);
2062 struct symtab
*s
= find_pc_symtab (pc
);
2068 return language_unknown
;
2072 /* Provide a prototype to silence -Wmissing-prototypes. */
2073 void _initialize_stack (void);
2076 _initialize_stack (void)
2079 backtrace_limit
= 30;
2082 add_com ("return", class_stack
, return_command
, _("\
2083 Make selected stack frame return to its caller.\n\
2084 Control remains in the debugger, but when you continue\n\
2085 execution will resume in the frame above the one now selected.\n\
2086 If an argument is given, it is an expression for the value to return."));
2088 add_com ("up", class_stack
, up_command
, _("\
2089 Select and print stack frame that called this one.\n\
2090 An argument says how many frames up to go."));
2091 add_com ("up-silently", class_support
, up_silently_command
, _("\
2092 Same as the `up' command, but does not print anything.\n\
2093 This is useful in command scripts."));
2095 add_com ("down", class_stack
, down_command
, _("\
2096 Select and print stack frame called by this one.\n\
2097 An argument says how many frames down to go."));
2098 add_com_alias ("do", "down", class_stack
, 1);
2099 add_com_alias ("dow", "down", class_stack
, 1);
2100 add_com ("down-silently", class_support
, down_silently_command
, _("\
2101 Same as the `down' command, but does not print anything.\n\
2102 This is useful in command scripts."));
2104 add_com ("frame", class_stack
, frame_command
, _("\
2105 Select and print a stack frame.\n\
2106 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2107 An argument specifies the frame to select.\n\
2108 It can be a stack frame number or the address of the frame.\n\
2109 With argument, nothing is printed if input is coming from\n\
2110 a command file or a user-defined command."));
2112 add_com_alias ("f", "frame", class_stack
, 1);
2116 add_com ("L", class_stack
, current_frame_command
,
2117 _("Print the current stack frame.\n"));
2118 add_com_alias ("V", "frame", class_stack
, 1);
2120 add_com ("select-frame", class_stack
, select_frame_command
, _("\
2121 Select a stack frame without printing anything.\n\
2122 An argument specifies the frame to select.\n\
2123 It can be a stack frame number or the address of the frame.\n"));
2125 add_com ("backtrace", class_stack
, backtrace_command
, _("\
2126 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2127 With a negative argument, print outermost -COUNT frames.\n\
2128 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2129 add_com_alias ("bt", "backtrace", class_stack
, 0);
2132 add_com_alias ("t", "backtrace", class_stack
, 0);
2133 add_com ("T", class_stack
, backtrace_full_command
, _("\
2134 Print backtrace of all stack frames, or innermost COUNT frames \n\
2135 and the values of the local variables.\n\
2136 With a negative argument, print outermost -COUNT frames.\n\
2137 Usage: T <count>\n"));
2140 add_com_alias ("where", "backtrace", class_alias
, 0);
2141 add_info ("stack", backtrace_command
,
2142 _("Backtrace of the stack, or innermost COUNT frames."));
2143 add_info_alias ("s", "stack", 1);
2144 add_info ("frame", frame_info
,
2145 _("All about selected stack frame, or frame at ADDR."));
2146 add_info_alias ("f", "frame", 1);
2147 add_info ("locals", locals_info
,
2148 _("Local variables of current stack frame."));
2149 add_info ("args", args_info
,
2150 _("Argument variables of current stack frame."));
2152 add_com ("l", class_info
, args_plus_locals_info
,
2153 _("Argument and local variables of current stack frame."));
2156 add_com ("func", class_stack
, func_command
, _("\
2157 Select the stack frame that contains <func>.\n\
2158 Usage: func <name>\n"));
2160 add_info ("catch", catch_info
,
2161 _("Exceptions that can be caught in the current stack frame."));
2163 add_setshow_enum_cmd ("frame-arguments", class_stack
,
2164 print_frame_arguments_choices
, &print_frame_arguments
,
2165 _("Set printing of non-scalar frame arguments"),
2166 _("Show printing of non-scalar frame arguments"),
2167 NULL
, NULL
, NULL
, &setprintlist
, &showprintlist
);
2169 add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack
,
2170 &disassemble_next_line
, _("\
2171 Set whether to disassemble next source line or insn when execution stops."), _("\
2172 Show whether to disassemble next source line or insn when execution stops."), _("\
2173 If ON, GDB will display disassembly of the next source line, in addition\n\
2174 to displaying the source line itself. If the next source line cannot\n\
2175 be displayed (e.g., source is unavailable or there's no line info), GDB\n\
2176 will display disassembly of next instruction instead of showing the\n\
2178 If AUTO, display disassembly of next instruction only if the source line\n\
2179 cannot be displayed.\n\
2180 If OFF (which is the default), never display the disassembly of the next\n\
2183 show_disassemble_next_line
,
2184 &setlist
, &showlist
);
2185 disassemble_next_line
= AUTO_BOOLEAN_FALSE
;
2188 add_cmd ("backtrace-limit", class_stack
, set_backtrace_limit_command
, _(\
2189 "Specify maximum number of frames for \"backtrace\" to print by default."),
2191 add_info ("backtrace-limit", backtrace_limit_info
, _("\
2192 The maximum number of frames for \"backtrace\" to print by default."));