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 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 "gdb_assert.h"
51 #include "gdb_string.h"
53 void (*deprecated_selected_frame_level_changed_hook) (int);
55 /* The possible choices of "set print frame-arguments, and the value
58 static const char *print_frame_arguments_choices[] =
59 {"all", "scalars", "none", NULL};
60 static const char *print_frame_arguments = "all";
62 /* Prototypes for local functions. */
64 static void print_frame_local_vars (struct frame_info *, int,
67 static void print_frame (struct frame_info *frame, int print_level,
68 enum print_what print_what, int print_args,
69 struct symtab_and_line sal);
71 /* Zero means do things normally; we are interacting directly with the
72 user. One means print the full filename and linenumber when a
73 frame is printed, and do so in a format emacs18/emacs19.22 can
74 parse. Two means print similar annotations, but in many more
75 cases and in a slightly different syntax. */
77 int annotation_level = 0;
80 struct print_stack_frame_args
82 struct frame_info *frame;
84 enum print_what print_what;
88 /* Show or print the frame arguments; stub for catch_errors. */
91 print_stack_frame_stub (void *args)
93 struct print_stack_frame_args *p = args;
94 int center = (p->print_what == SRC_LINE || p->print_what == SRC_AND_LOC);
96 print_frame_info (p->frame, p->print_level, p->print_what, p->print_args);
97 set_current_sal_from_frame (p->frame, center);
101 /* Show or print a stack frame FRAME briefly. The output is format
102 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
103 relative level, function name, argument list, and file name and
104 line number. If the frame's PC is not at the beginning of the
105 source line, the actual PC is printed at the beginning. */
108 print_stack_frame (struct frame_info *frame, int print_level,
109 enum print_what print_what)
111 struct print_stack_frame_args args;
114 args.print_level = print_level;
115 args.print_what = print_what;
116 /* For mi, alway print location and address. */
117 args.print_what = ui_out_is_mi_like_p (uiout) ? LOC_AND_ADDRESS : print_what;
120 catch_errors (print_stack_frame_stub, &args, "", RETURN_MASK_ERROR);
123 struct print_args_args
126 struct frame_info *frame;
127 struct ui_file *stream;
130 static int print_args_stub (void *args);
132 /* Print nameless arguments of frame FRAME on STREAM, where START is
133 the offset of the first nameless argument, and NUM is the number of
134 nameless arguments to print. FIRST is nonzero if this is the first
135 argument (not just the first nameless argument). */
138 print_frame_nameless_args (struct frame_info *frame, long start, int num,
139 int first, struct ui_file *stream)
145 for (i = 0; i < num; i++)
148 argsaddr = get_frame_args_address (frame);
151 arg_value = read_memory_integer (argsaddr + start, sizeof (int));
153 fprintf_filtered (stream, ", ");
154 fprintf_filtered (stream, "%ld", arg_value);
156 start += sizeof (int);
160 /* Return non-zero if the debugger should print the value of the provided
161 symbol parameter (SYM). */
164 print_this_frame_argument_p (struct symbol *sym)
168 /* If the user asked to print no argument at all, then obviously
169 do not print this argument. */
171 if (strcmp (print_frame_arguments, "none") == 0)
174 /* If the user asked to print all arguments, then we should print
177 if (strcmp (print_frame_arguments, "all") == 0)
180 /* The user asked to print only the scalar arguments, so do not
181 print the non-scalar ones. */
183 type = CHECK_TYPEDEF (SYMBOL_TYPE (sym));
184 while (TYPE_CODE (type) == TYPE_CODE_REF)
185 type = CHECK_TYPEDEF (TYPE_TARGET_TYPE (type));
186 switch (TYPE_CODE (type))
188 case TYPE_CODE_ARRAY:
189 case TYPE_CODE_STRUCT:
190 case TYPE_CODE_UNION:
192 case TYPE_CODE_STRING:
193 case TYPE_CODE_BITSTRING:
200 /* Print the arguments of frame FRAME on STREAM, given the function
201 FUNC running in that frame (as a symbol), where NUM is the number
202 of arguments according to the stack frame (or -1 if the number of
203 arguments is unknown). */
205 /* Note that currently the "number of arguments according to the
206 stack frame" is only known on VAX where i refers to the "number of
207 ints of arguments according to the stack frame". */
210 print_frame_args (struct symbol *func, struct frame_info *frame,
211 int num, struct ui_file *stream)
214 /* Offset of next stack argument beyond the one we have seen that is
215 at the highest offset, or -1 if we haven't come to a stack
217 long highest_offset = -1;
218 /* Number of ints of arguments that we have printed so far. */
219 int args_printed = 0;
220 struct cleanup *old_chain, *list_chain;
221 struct ui_stream *stb;
223 stb = ui_out_stream_new (uiout);
224 old_chain = make_cleanup_ui_out_stream_delete (stb);
228 struct block *b = SYMBOL_BLOCK_VALUE (func);
229 struct dict_iterator iter;
233 ALL_BLOCK_SYMBOLS (b, iter, sym)
237 /* Keep track of the highest stack argument offset seen, and
238 skip over any kinds of symbols we don't care about. */
240 if (!SYMBOL_IS_ARGUMENT (sym))
243 switch (SYMBOL_CLASS (sym))
248 long current_offset = SYMBOL_VALUE (sym);
249 int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
251 /* Compute address of next argument by adding the size of
252 this argument and rounding to an int boundary. */
254 ((current_offset + arg_size + sizeof (int) - 1)
255 & ~(sizeof (int) - 1));
257 /* If this is the highest offset seen yet, set
259 if (highest_offset == -1
260 || (current_offset > highest_offset))
261 highest_offset = current_offset;
263 /* Add the number of ints we're about to print to
265 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
268 /* We care about types of symbols, but don't need to
269 keep track of stack offsets in them. */
271 case LOC_REGPARM_ADDR:
273 case LOC_OPTIMIZED_OUT:
278 /* We have to look up the symbol because arguments can have
279 two entries (one a parameter, one a local) and the one we
280 want is the local, which lookup_symbol will find for us.
281 This includes gcc1 (not gcc2) on SPARC when passing a
282 small structure and gcc2 when the argument type is float
283 and it is passed as a double and converted to float by
284 the prologue (in the latter case the type of the LOC_ARG
285 symbol is double and the type of the LOC_LOCAL symbol is
287 /* But if the parameter name is null, don't try it. Null
288 parameter names occur on the RS/6000, for traceback
289 tables. FIXME, should we even print them? */
291 if (*SYMBOL_LINKAGE_NAME (sym))
294 nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
295 b, VAR_DOMAIN, NULL);
296 gdb_assert (nsym != NULL);
297 if (SYMBOL_CLASS (nsym) == LOC_REGISTER
298 && !SYMBOL_IS_ARGUMENT (nsym))
300 /* There is a LOC_ARG/LOC_REGISTER pair. This means
301 that it was passed on the stack and loaded into a
302 register, or passed in a register and stored in a
303 stack slot. GDB 3.x used the LOC_ARG; GDB
304 4.0-4.11 used the LOC_REGISTER.
306 Reasons for using the LOC_ARG:
308 (1) Because find_saved_registers may be slow for
311 (2) Because registers are often re-used and stack
312 slots rarely (never?) are. Therefore using
313 the stack slot is much less likely to print
316 Reasons why we might want to use the LOC_REGISTER:
318 (1) So that the backtrace prints the same value
319 as "print foo". I see no compelling reason
320 why this needs to be the case; having the
321 backtrace print the value which was passed
322 in, and "print foo" print the value as
323 modified within the called function, makes
326 Additional note: It might be nice if "info args"
327 displayed both values.
329 One more note: There is a case with SPARC
330 structure passing where we need to use the
331 LOC_REGISTER, but this is dealt with by creating
332 a single LOC_REGPARM in symbol reading. */
334 /* Leave sym (the LOC_ARG) alone. */
341 /* Print the current arg. */
343 ui_out_text (uiout, ", ");
344 ui_out_wrap_hint (uiout, " ");
346 annotate_arg_begin ();
348 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
349 fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym),
350 SYMBOL_LANGUAGE (sym),
351 DMGL_PARAMS | DMGL_ANSI);
352 ui_out_field_stream (uiout, "name", stb);
353 annotate_arg_name_end ();
354 ui_out_text (uiout, "=");
356 if (print_this_frame_argument_p (sym))
358 /* Avoid value_print because it will deref ref parameters.
359 We just want to print their addresses. Print ??? for
360 args whose address we do not know. We pass 2 as
361 "recurse" to val_print because our standard indentation
362 here is 4 spaces, and val_print indents 2 for each
364 val = read_var_value (sym, frame);
366 annotate_arg_value (val == NULL ? NULL : value_type (val));
370 const struct language_defn *language;
371 struct value_print_options opts;
373 /* Use the appropriate language to display our symbol,
374 unless the user forced the language to a specific
376 if (language_mode == language_mode_auto)
377 language = language_def (SYMBOL_LANGUAGE (sym));
379 language = current_language;
381 get_raw_print_options (&opts);
383 common_val_print (val, stb->stream, 2,
385 ui_out_field_stream (uiout, "value", stb);
388 ui_out_text (uiout, "???");
391 ui_out_text (uiout, "...");
394 /* Invoke ui_out_tuple_end. */
395 do_cleanups (list_chain);
403 /* Don't print nameless args in situations where we don't know
404 enough about the stack to find them. */
409 if (highest_offset == -1)
410 start = gdbarch_frame_args_skip (get_frame_arch (frame));
412 start = highest_offset;
414 print_frame_nameless_args (frame, start, num - args_printed,
418 do_cleanups (old_chain);
421 /* Stub for catch_errors. */
424 print_args_stub (void *args)
426 struct print_args_args *p = args;
427 struct gdbarch *gdbarch = get_frame_arch (p->frame);
430 if (gdbarch_frame_num_args_p (gdbarch))
432 numargs = gdbarch_frame_num_args (gdbarch, p->frame);
433 gdb_assert (numargs >= 0);
437 print_frame_args (p->func, p->frame, numargs, p->stream);
441 /* Set the current source and line to the location given by frame
442 FRAME, if possible. When CENTER is true, adjust so the relevant
443 line is in the center of the next 'list'. */
446 set_current_sal_from_frame (struct frame_info *frame, int center)
448 struct symtab_and_line sal;
450 find_frame_sal (frame, &sal);
454 sal.line = max (sal.line - get_lines_to_list () / 2, 1);
455 set_current_source_symtab_and_line (&sal);
459 /* Print information about frame FRAME. The output is format according
460 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
463 SRC_LINE: Print only source line.
464 LOCATION: Print only location.
465 LOC_AND_SRC: Print location and source line.
467 Used in "where" output, and to emit breakpoint or step
471 print_frame_info (struct frame_info *frame, int print_level,
472 enum print_what print_what, int print_args)
474 struct symtab_and_line sal;
478 if (get_frame_type (frame) == DUMMY_FRAME
479 || get_frame_type (frame) == SIGTRAMP_FRAME)
481 struct cleanup *uiout_cleanup
482 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
484 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
485 get_frame_pc (frame));
487 /* Do this regardless of SOURCE because we don't have any source
488 to list for this frame. */
491 ui_out_text (uiout, "#");
492 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
493 frame_relative_level (frame));
495 if (ui_out_is_mi_like_p (uiout))
497 annotate_frame_address ();
498 ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame));
499 annotate_frame_address_end ();
502 if (get_frame_type (frame) == DUMMY_FRAME)
504 annotate_function_call ();
505 ui_out_field_string (uiout, "func", "<function called from gdb>");
507 else if (get_frame_type (frame) == SIGTRAMP_FRAME)
509 annotate_signal_handler_caller ();
510 ui_out_field_string (uiout, "func", "<signal handler called>");
512 ui_out_text (uiout, "\n");
513 annotate_frame_end ();
515 do_cleanups (uiout_cleanup);
519 /* If FRAME is not the innermost frame, that normally means that
520 FRAME->pc points to *after* the call instruction, and we want to
521 get the line containing the call, never the next line. But if
522 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
523 next frame was not entered as the result of a call, and we want
524 to get the line containing FRAME->pc. */
525 find_frame_sal (frame, &sal);
527 location_print = (print_what == LOCATION
528 || print_what == LOC_AND_ADDRESS
529 || print_what == SRC_AND_LOC);
531 if (location_print || !sal.symtab)
532 print_frame (frame, print_level, print_what, print_args, sal);
534 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
536 if (source_print && sal.symtab)
539 int mid_statement = ((print_what == SRC_LINE)
540 && (get_frame_pc (frame) != sal.pc));
542 if (annotation_level)
543 done = identify_source_line (sal.symtab, sal.line, mid_statement,
544 get_frame_pc (frame));
547 if (deprecated_print_frame_info_listing_hook)
548 deprecated_print_frame_info_listing_hook (sal.symtab,
553 struct value_print_options opts;
554 get_user_print_options (&opts);
555 /* We used to do this earlier, but that is clearly
556 wrong. This function is used by many different
557 parts of gdb, including normal_stop in infrun.c,
558 which uses this to print out the current PC
559 when we stepi/nexti into the middle of a source
560 line. Only the command line really wants this
561 behavior. Other UIs probably would like the
562 ability to decide for themselves if it is desired. */
563 if (opts.addressprint && mid_statement)
565 ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame));
566 ui_out_text (uiout, "\t");
569 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
574 if (print_what != LOCATION)
575 set_default_breakpoint (1, get_frame_pc (frame), sal.symtab, sal.line);
577 annotate_frame_end ();
579 gdb_flush (gdb_stdout);
583 print_frame (struct frame_info *frame, int print_level,
584 enum print_what print_what, int print_args,
585 struct symtab_and_line sal)
588 char *funname = NULL;
589 enum language funlang = language_unknown;
590 struct ui_stream *stb;
591 struct cleanup *old_chain, *list_chain;
592 struct value_print_options opts;
594 stb = ui_out_stream_new (uiout);
595 old_chain = make_cleanup_ui_out_stream_delete (stb);
597 func = find_pc_function (get_frame_address_in_block (frame));
600 /* In certain pathological cases, the symtabs give the wrong
601 function (when we are in the first function in a file which
602 is compiled without debugging symbols, the previous function
603 is compiled with debugging symbols, and the "foo.o" symbol
604 that is supposed to tell us where the file with debugging
605 symbols ends has been truncated by ar because it is longer
606 than 15 characters). This also occurs if the user uses asm()
607 to create a function but not stabs for it (in a file compiled
610 So look in the minimal symbol tables as well, and if it comes
611 up with a larger address for the function use that instead.
612 I don't think this can ever cause any problems; there
613 shouldn't be any minimal symbols in the middle of a function;
614 if this is ever changed many parts of GDB will need to be
615 changed (and we'll create a find_pc_minimal_function or some
618 struct minimal_symbol *msymbol =
619 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
622 && (SYMBOL_VALUE_ADDRESS (msymbol)
623 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
625 /* We also don't know anything about the function besides
626 its address and name. */
628 funname = SYMBOL_PRINT_NAME (msymbol);
629 funlang = SYMBOL_LANGUAGE (msymbol);
633 funname = SYMBOL_PRINT_NAME (func);
634 funlang = SYMBOL_LANGUAGE (func);
635 if (funlang == language_cplus)
637 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
638 to display the demangled name that we already have
639 stored in the symbol table, but we stored a version
640 with DMGL_PARAMS turned on, and here we don't want to
641 display parameters. So remove the parameters. */
642 char *func_only = cp_remove_params (funname);
646 make_cleanup (xfree, func_only);
653 struct minimal_symbol *msymbol =
654 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
658 funname = SYMBOL_PRINT_NAME (msymbol);
659 funlang = SYMBOL_LANGUAGE (msymbol);
663 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
664 get_frame_pc (frame));
666 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
670 ui_out_text (uiout, "#");
671 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
672 frame_relative_level (frame));
674 get_user_print_options (&opts);
675 if (opts.addressprint)
676 if (get_frame_pc (frame) != sal.pc || !sal.symtab
677 || print_what == LOC_AND_ADDRESS)
679 annotate_frame_address ();
680 ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame));
681 annotate_frame_address_end ();
682 ui_out_text (uiout, " in ");
684 annotate_frame_function_name ();
685 fprintf_symbol_filtered (stb->stream, funname ? funname : "??",
687 ui_out_field_stream (uiout, "func", stb);
688 ui_out_wrap_hint (uiout, " ");
689 annotate_frame_args ();
691 ui_out_text (uiout, " (");
694 struct print_args_args args;
695 struct cleanup *args_list_chain;
698 args.stream = gdb_stdout;
699 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
700 catch_errors (print_args_stub, &args, "", RETURN_MASK_ERROR);
701 /* FIXME: ARGS must be a list. If one argument is a string it
702 will have " that will not be properly escaped. */
703 /* Invoke ui_out_tuple_end. */
704 do_cleanups (args_list_chain);
707 ui_out_text (uiout, ")");
708 if (sal.symtab && sal.symtab->filename)
710 annotate_frame_source_begin ();
711 ui_out_wrap_hint (uiout, " ");
712 ui_out_text (uiout, " at ");
713 annotate_frame_source_file ();
714 ui_out_field_string (uiout, "file", sal.symtab->filename);
715 if (ui_out_is_mi_like_p (uiout))
717 const char *fullname = symtab_to_fullname (sal.symtab);
718 if (fullname != NULL)
719 ui_out_field_string (uiout, "fullname", fullname);
721 annotate_frame_source_file_end ();
722 ui_out_text (uiout, ":");
723 annotate_frame_source_line ();
724 ui_out_field_int (uiout, "line", sal.line);
725 annotate_frame_source_end ();
728 if (!funname || (!sal.symtab || !sal.symtab->filename))
731 char *lib = PC_SOLIB (get_frame_pc (frame));
733 char *lib = solib_address (get_frame_pc (frame));
737 annotate_frame_where ();
738 ui_out_wrap_hint (uiout, " ");
739 ui_out_text (uiout, " from ");
740 ui_out_field_string (uiout, "from", lib);
744 /* do_cleanups will call ui_out_tuple_end() for us. */
745 do_cleanups (list_chain);
746 ui_out_text (uiout, "\n");
747 do_cleanups (old_chain);
751 /* Read a frame specification in whatever the appropriate format is
752 from FRAME_EXP. Call error(), printing MESSAGE, if the
753 specification is in any way invalid (so this function never returns
754 NULL). When SEPECTED_P is non-NULL set its target to indicate that
755 the default selected frame was used. */
757 static struct frame_info *
758 parse_frame_specification_1 (const char *frame_exp, const char *message,
759 int *selected_frame_p)
762 struct value *args[4];
763 CORE_ADDR addrs[ARRAY_SIZE (args)];
765 if (frame_exp == NULL)
770 struct cleanup *tmp_cleanup;
776 struct cleanup *cleanup;
779 /* Skip leading white space, bail of EOL. */
780 while (isspace (*frame_exp))
785 /* Parse the argument, extract it, save it. */
789 addr_string = savestring (frame_exp, p - frame_exp);
791 cleanup = make_cleanup (xfree, addr_string);
793 /* NOTE: Parse and evaluate expression, but do not use
794 functions such as parse_and_eval_long or
795 parse_and_eval_address to also extract the value.
796 Instead value_as_long and value_as_address are used.
797 This avoids problems with expressions that contain
799 if (numargs >= ARRAY_SIZE (args))
800 error (_("Too many args in frame specification"));
801 args[numargs++] = parse_and_eval (addr_string);
803 do_cleanups (cleanup);
807 /* If no args, default to the selected frame. */
810 if (selected_frame_p != NULL)
811 (*selected_frame_p) = 1;
812 return get_selected_frame (message);
815 /* None of the remaining use the selected frame. */
816 if (selected_frame_p != NULL)
817 (*selected_frame_p) = 0;
819 /* Assume the single arg[0] is an integer, and try using that to
820 select a frame relative to current. */
823 struct frame_info *fid;
824 int level = value_as_long (args[0]);
825 fid = find_relative_frame (get_current_frame (), &level);
827 /* find_relative_frame was successful */
831 /* Convert each value into a corresponding address. */
834 for (i = 0; i < numargs; i++)
835 addrs[i] = value_as_address (args[0]);
838 /* Assume that the single arg[0] is an address, use that to identify
839 a frame with a matching ID. Should this also accept stack/pc or
843 struct frame_id id = frame_id_build_wild (addrs[0]);
844 struct frame_info *fid;
846 /* If (s)he specifies the frame with an address, he deserves
847 what (s)he gets. Still, give the highest one that matches.
848 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
850 for (fid = get_current_frame ();
852 fid = get_prev_frame (fid))
854 if (frame_id_eq (id, get_frame_id (fid)))
856 while (frame_id_eq (id, frame_unwind_id (fid)))
857 fid = get_prev_frame (fid);
863 /* We couldn't identify the frame as an existing frame, but
864 perhaps we can create one with a single argument. */
866 return create_new_frame (addrs[0], 0);
867 else if (numargs == 2)
868 return create_new_frame (addrs[0], addrs[1]);
870 error (_("Too many args in frame specification"));
873 static struct frame_info *
874 parse_frame_specification (char *frame_exp)
876 return parse_frame_specification_1 (frame_exp, NULL, NULL);
879 /* Print verbosely the selected frame or the frame at address
880 ADDR_EXP. Absolutely all information in the frame is printed. */
883 frame_info (char *addr_exp, int from_tty)
885 struct frame_info *fi;
886 struct symtab_and_line sal;
889 struct frame_info *calling_frame_info;
890 int i, count, numregs;
892 enum language funlang = language_unknown;
893 const char *pc_regname;
894 int selected_frame_p;
895 struct gdbarch *gdbarch;
896 struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
898 fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
899 gdbarch = get_frame_arch (fi);
901 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
902 is not a good name. */
903 if (gdbarch_pc_regnum (gdbarch) >= 0)
904 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
905 easily not match that of the internal value returned by
907 pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch));
909 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
910 architectures will often have a hardware register called "pc",
911 and that register's value, again, can easily not match
915 find_frame_sal (fi, &sal);
916 func = get_frame_function (fi);
917 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
919 s = find_pc_symtab (get_frame_pc (fi));
922 funname = SYMBOL_PRINT_NAME (func);
923 funlang = SYMBOL_LANGUAGE (func);
924 if (funlang == language_cplus)
926 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
927 to display the demangled name that we already have
928 stored in the symbol table, but we stored a version
929 with DMGL_PARAMS turned on, and here we don't want to
930 display parameters. So remove the parameters. */
931 char *func_only = cp_remove_params (funname);
935 make_cleanup (xfree, func_only);
941 struct minimal_symbol *msymbol;
943 msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
946 funname = SYMBOL_PRINT_NAME (msymbol);
947 funlang = SYMBOL_LANGUAGE (msymbol);
950 calling_frame_info = get_prev_frame (fi);
952 if (selected_frame_p && frame_relative_level (fi) >= 0)
954 printf_filtered (_("Stack level %d, frame at "),
955 frame_relative_level (fi));
959 printf_filtered (_("Stack frame at "));
961 fputs_filtered (paddress (get_frame_base (fi)), gdb_stdout);
962 printf_filtered (":\n");
963 printf_filtered (" %s = ", pc_regname);
964 fputs_filtered (paddress (get_frame_pc (fi)), gdb_stdout);
969 printf_filtered (" in ");
970 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
971 DMGL_ANSI | DMGL_PARAMS);
975 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
976 puts_filtered ("; ");
978 printf_filtered ("saved %s ", pc_regname);
979 fputs_filtered (paddress (frame_pc_unwind (fi)), gdb_stdout);
980 printf_filtered ("\n");
982 if (calling_frame_info == NULL)
984 enum unwind_stop_reason reason;
986 reason = get_frame_unwind_stop_reason (fi);
987 if (reason != UNWIND_NO_REASON)
988 printf_filtered (_(" Outermost frame: %s\n"),
989 frame_stop_reason_string (reason));
992 if (calling_frame_info)
994 printf_filtered (" called by frame at ");
995 fputs_filtered (paddress (get_frame_base (calling_frame_info)),
998 if (get_next_frame (fi) && calling_frame_info)
1001 if (get_next_frame (fi))
1003 printf_filtered (" caller of frame at ");
1004 fputs_filtered (paddress (get_frame_base (get_next_frame (fi))),
1007 if (get_next_frame (fi) || calling_frame_info)
1008 puts_filtered ("\n");
1011 printf_filtered (" source language %s.\n",
1012 language_str (s->language));
1015 /* Address of the argument list for this frame, or 0. */
1016 CORE_ADDR arg_list = get_frame_args_address (fi);
1017 /* Number of args for this frame, or -1 if unknown. */
1021 printf_filtered (" Arglist at unknown address.\n");
1024 printf_filtered (" Arglist at ");
1025 fputs_filtered (paddress (arg_list), gdb_stdout);
1026 printf_filtered (",");
1028 if (!gdbarch_frame_num_args_p (gdbarch))
1031 puts_filtered (" args: ");
1035 numargs = gdbarch_frame_num_args (gdbarch, fi);
1036 gdb_assert (numargs >= 0);
1038 puts_filtered (" no args.");
1039 else if (numargs == 1)
1040 puts_filtered (" 1 arg: ");
1042 printf_filtered (" %d args: ", numargs);
1044 print_frame_args (func, fi, numargs, gdb_stdout);
1045 puts_filtered ("\n");
1049 /* Address of the local variables for this frame, or 0. */
1050 CORE_ADDR arg_list = get_frame_locals_address (fi);
1053 printf_filtered (" Locals at unknown address,");
1056 printf_filtered (" Locals at ");
1057 fputs_filtered (paddress (arg_list), gdb_stdout);
1058 printf_filtered (",");
1062 /* Print as much information as possible on the location of all the
1065 enum lval_type lval;
1073 /* The sp is special; what's displayed isn't the save address, but
1074 the value of the previous frame's sp. This is a legacy thing,
1075 at one stage the frame cached the previous frame's SP instead
1076 of its address, hence it was easiest to just display the cached
1078 if (gdbarch_sp_regnum (gdbarch) >= 0)
1080 /* Find out the location of the saved stack pointer with out
1081 actually evaluating it. */
1082 frame_register_unwind (fi, gdbarch_sp_regnum (gdbarch),
1083 &optimized, &lval, &addr,
1085 if (!optimized && lval == not_lval)
1087 gdb_byte value[MAX_REGISTER_SIZE];
1089 frame_register_unwind (fi, gdbarch_sp_regnum (gdbarch),
1090 &optimized, &lval, &addr,
1092 /* NOTE: cagney/2003-05-22: This is assuming that the
1093 stack pointer was packed as an unsigned integer. That
1094 may or may not be valid. */
1095 sp = extract_unsigned_integer (value,
1096 register_size (gdbarch,
1097 gdbarch_sp_regnum (gdbarch)));
1098 printf_filtered (" Previous frame's sp is ");
1099 fputs_filtered (paddress (sp), gdb_stdout);
1100 printf_filtered ("\n");
1103 else if (!optimized && lval == lval_memory)
1105 printf_filtered (" Previous frame's sp at ");
1106 fputs_filtered (paddress (addr), gdb_stdout);
1107 printf_filtered ("\n");
1110 else if (!optimized && lval == lval_register)
1112 printf_filtered (" Previous frame's sp in %s\n",
1113 gdbarch_register_name (gdbarch, realnum));
1116 /* else keep quiet. */
1120 numregs = gdbarch_num_regs (gdbarch)
1121 + gdbarch_num_pseudo_regs (gdbarch);
1122 for (i = 0; i < numregs; i++)
1123 if (i != gdbarch_sp_regnum (gdbarch)
1124 && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup))
1126 /* Find out the location of the saved register without
1127 fetching the corresponding value. */
1128 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1130 /* For moment, only display registers that were saved on the
1132 if (!optimized && lval == lval_memory)
1135 puts_filtered (" Saved registers:\n ");
1137 puts_filtered (",");
1139 printf_filtered (" %s at ",
1140 gdbarch_register_name (gdbarch, i));
1141 fputs_filtered (paddress (addr), gdb_stdout);
1145 if (count || need_nl)
1146 puts_filtered ("\n");
1149 do_cleanups (back_to);
1152 /* Print briefly all stack frames or just the innermost COUNT_EXP
1156 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1158 struct frame_info *fi;
1161 struct frame_info *trailing;
1164 if (!target_has_stack)
1165 error (_("No stack."));
1167 /* The following code must do two things. First, it must set the
1168 variable TRAILING to the frame from which we should start
1169 printing. Second, it must set the variable count to the number
1170 of frames which we should print, or -1 if all of them. */
1171 trailing = get_current_frame ();
1173 /* The target can be in a state where there is no valid frames
1174 (e.g., just connected). */
1175 if (trailing == NULL)
1176 error (_("No stack."));
1181 count = parse_and_eval_long (count_exp);
1184 struct frame_info *current;
1189 while (current && count--)
1192 current = get_prev_frame (current);
1195 /* Will stop when CURRENT reaches the top of the stack.
1196 TRAILING will be COUNT below it. */
1200 trailing = get_prev_frame (trailing);
1201 current = get_prev_frame (current);
1213 struct partial_symtab *ps;
1215 /* Read in symbols for all of the frames. Need to do this in a
1216 separate pass so that "Reading in symbols for xxx" messages
1217 don't screw up the appearance of the backtrace. Also if
1218 people have strong opinions against reading symbols for
1219 backtrace this may have to be an option. */
1221 for (fi = trailing; fi != NULL && i--; fi = get_prev_frame (fi))
1224 ps = find_pc_psymtab (get_frame_address_in_block (fi));
1226 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in. */
1230 for (i = 0, fi = trailing; fi && count--; i++, fi = get_prev_frame (fi))
1234 /* Don't use print_stack_frame; if an error() occurs it probably
1235 means further attempts to backtrace would fail (on the other
1236 hand, perhaps the code does or could be fixed to make sure
1237 the frame->prev field gets set to NULL in that case). */
1238 print_frame_info (fi, 1, LOCATION, 1);
1240 print_frame_local_vars (fi, 1, gdb_stdout);
1242 /* Save the last frame to check for error conditions. */
1246 /* If we've stopped before the end, mention that. */
1248 printf_filtered (_("(More stack frames follow...)\n"));
1250 /* If we've run out of frames, and the reason appears to be an error
1251 condition, print it. */
1252 if (fi == NULL && trailing != NULL)
1254 enum unwind_stop_reason reason;
1256 reason = get_frame_unwind_stop_reason (trailing);
1257 if (reason > UNWIND_FIRST_ERROR)
1258 printf_filtered (_("Backtrace stopped: %s\n"),
1259 frame_stop_reason_string (reason));
1263 struct backtrace_command_args
1270 /* Stub for catch_errors. */
1273 backtrace_command_stub (void *data)
1275 struct backtrace_command_args *args = data;
1276 backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty);
1281 backtrace_command (char *arg, int from_tty)
1283 struct cleanup *old_chain = NULL;
1284 int fulltrace_arg = -1, arglen = 0, argc = 0;
1285 struct backtrace_command_args btargs;
1292 argv = gdb_buildargv (arg);
1293 old_chain = make_cleanup_freeargv (argv);
1295 for (i = 0; argv[i]; i++)
1299 for (j = 0; j < strlen (argv[i]); j++)
1300 argv[i][j] = tolower (argv[i][j]);
1302 if (fulltrace_arg < 0 && subset_compare (argv[i], "full"))
1303 fulltrace_arg = argc;
1306 arglen += strlen (argv[i]);
1311 if (fulltrace_arg >= 0)
1315 arg = xmalloc (arglen + 1);
1316 memset (arg, 0, arglen + 1);
1317 for (i = 0; i < (argc + 1); i++)
1319 if (i != fulltrace_arg)
1321 strcat (arg, argv[i]);
1331 btargs.count_exp = arg;
1332 btargs.show_locals = (fulltrace_arg >= 0);
1333 btargs.from_tty = from_tty;
1334 catch_errors (backtrace_command_stub, &btargs, "", RETURN_MASK_ERROR);
1336 if (fulltrace_arg >= 0 && arglen > 0)
1340 do_cleanups (old_chain);
1344 backtrace_full_command (char *arg, int from_tty)
1346 struct backtrace_command_args btargs;
1347 btargs.count_exp = arg;
1348 btargs.show_locals = 1;
1349 btargs.from_tty = from_tty;
1350 catch_errors (backtrace_command_stub, &btargs, "", RETURN_MASK_ERROR);
1354 /* Print the local variables of a block B active in FRAME on STREAM.
1355 Return 1 if any variables were printed; 0 otherwise. */
1358 print_block_frame_locals (struct block *b, struct frame_info *frame,
1359 int num_tabs, struct ui_file *stream)
1361 struct dict_iterator iter;
1363 int values_printed = 0;
1366 ALL_BLOCK_SYMBOLS (b, iter, sym)
1368 switch (SYMBOL_CLASS (sym))
1374 if (SYMBOL_IS_ARGUMENT (sym))
1377 for (j = 0; j < num_tabs; j++)
1378 fputs_filtered ("\t", stream);
1379 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1380 fputs_filtered (" = ", stream);
1381 print_variable_value (sym, frame, stream);
1382 fprintf_filtered (stream, "\n");
1386 /* Ignore symbols which are not locals. */
1391 return values_printed;
1394 /* Same, but print labels. */
1397 print_block_frame_labels (struct block *b, int *have_default,
1398 struct ui_file *stream)
1400 struct dict_iterator iter;
1402 int values_printed = 0;
1404 ALL_BLOCK_SYMBOLS (b, iter, sym)
1406 if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0)
1412 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1414 struct symtab_and_line sal;
1415 struct value_print_options opts;
1416 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1418 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1419 get_user_print_options (&opts);
1420 if (opts.addressprint)
1422 fprintf_filtered (stream, " ");
1423 fputs_filtered (paddress (SYMBOL_VALUE_ADDRESS (sym)), stream);
1425 fprintf_filtered (stream, " in file %s, line %d\n",
1426 sal.symtab->filename, sal.line);
1430 return values_printed;
1433 /* Print on STREAM all the local variables in frame FRAME, including
1434 all the blocks active in that frame at its current PC.
1436 Returns 1 if the job was done, or 0 if nothing was printed because
1437 we have no info on the function running in FRAME. */
1440 print_frame_local_vars (struct frame_info *frame, int num_tabs,
1441 struct ui_file *stream)
1443 struct block *block = get_frame_block (frame, 0);
1444 int values_printed = 0;
1448 fprintf_filtered (stream, "No symbol table info available.\n");
1454 if (print_block_frame_locals (block, frame, num_tabs, stream))
1456 /* After handling the function's top-level block, stop. Don't
1457 continue to its superblock, the block of per-file symbols. */
1458 if (BLOCK_FUNCTION (block))
1460 block = BLOCK_SUPERBLOCK (block);
1463 if (!values_printed)
1464 fprintf_filtered (stream, _("No locals.\n"));
1467 /* Same, but print labels. */
1470 print_frame_label_vars (struct frame_info *frame, int this_level_only,
1471 struct ui_file *stream)
1474 fprintf_filtered (stream, "print_frame_label_vars disabled.\n");
1476 struct blockvector *bl;
1477 struct block *block = get_frame_block (frame, 0);
1478 int values_printed = 0;
1479 int index, have_default = 0;
1480 char *blocks_printed;
1481 CORE_ADDR pc = get_frame_pc (frame);
1485 fprintf_filtered (stream, "No symbol table info available.\n");
1489 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
1490 blocks_printed = alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1491 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1495 CORE_ADDR end = BLOCK_END (block) - 4;
1498 if (bl != blockvector_for_pc (end, &index))
1499 error (_("blockvector blotch"));
1500 if (BLOCKVECTOR_BLOCK (bl, index) != block)
1501 error (_("blockvector botch"));
1502 last_index = BLOCKVECTOR_NBLOCKS (bl);
1505 /* Don't print out blocks that have gone by. */
1506 while (index < last_index
1507 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
1510 while (index < last_index
1511 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
1513 if (blocks_printed[index] == 0)
1515 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index),
1516 &have_default, stream))
1518 blocks_printed[index] = 1;
1524 if (values_printed && this_level_only)
1527 /* After handling the function's top-level block, stop. Don't
1528 continue to its superblock, the block of per-file symbols. */
1529 if (BLOCK_FUNCTION (block))
1531 block = BLOCK_SUPERBLOCK (block);
1534 if (!values_printed && !this_level_only)
1535 fprintf_filtered (stream, _("No catches.\n"));
1540 locals_info (char *args, int from_tty)
1542 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1547 catch_info (char *ignore, int from_tty)
1549 struct symtab_and_line *sal;
1551 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1552 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1557 print_frame_arg_vars (struct frame_info *frame, struct ui_file *stream)
1559 struct symbol *func = get_frame_function (frame);
1561 struct dict_iterator iter;
1562 struct symbol *sym, *sym2;
1563 int values_printed = 0;
1567 fprintf_filtered (stream, _("No symbol table info available.\n"));
1571 b = SYMBOL_BLOCK_VALUE (func);
1572 ALL_BLOCK_SYMBOLS (b, iter, sym)
1574 /* Don't worry about things which aren't arguments. */
1575 if (SYMBOL_IS_ARGUMENT (sym))
1578 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1579 fputs_filtered (" = ", stream);
1581 /* We have to look up the symbol because arguments can have
1582 two entries (one a parameter, one a local) and the one we
1583 want is the local, which lookup_symbol will find for us.
1584 This includes gcc1 (not gcc2) on the sparc when passing a
1585 small structure and gcc2 when the argument type is float
1586 and it is passed as a double and converted to float by
1587 the prologue (in the latter case the type of the LOC_ARG
1588 symbol is double and the type of the LOC_LOCAL symbol is
1589 float). There are also LOC_ARG/LOC_REGISTER pairs which
1590 are not combined in symbol-reading. */
1592 sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
1593 b, VAR_DOMAIN, NULL);
1594 print_variable_value (sym2, frame, stream);
1595 fprintf_filtered (stream, "\n");
1599 if (!values_printed)
1600 fprintf_filtered (stream, _("No arguments.\n"));
1604 args_info (char *ignore, int from_tty)
1606 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1612 args_plus_locals_info (char *ignore, int from_tty)
1614 args_info (ignore, from_tty);
1615 locals_info (ignore, from_tty);
1619 /* Select frame FRAME. Also print the stack frame and show the source
1620 if this is the tui version. */
1622 select_and_print_frame (struct frame_info *frame)
1624 select_frame (frame);
1626 print_stack_frame (frame, 1, SRC_AND_LOC);
1629 /* Return the symbol-block in which the selected frame is executing.
1630 Can return zero under various legitimate circumstances.
1632 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1633 code address within the block returned. We use this to decide
1634 which macros are in scope. */
1637 get_selected_block (CORE_ADDR *addr_in_block)
1639 if (!target_has_stack)
1642 if (is_exited (inferior_ptid))
1645 if (is_executing (inferior_ptid))
1648 return get_frame_block (get_selected_frame (NULL), addr_in_block);
1651 /* Find a frame a certain number of levels away from FRAME.
1652 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1653 Positive means go to earlier frames (up); negative, the reverse.
1654 The int that contains the number of levels is counted toward
1655 zero as the frames for those levels are found.
1656 If the top or bottom frame is reached, that frame is returned,
1657 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1658 how much farther the original request asked to go. */
1661 find_relative_frame (struct frame_info *frame, int *level_offset_ptr)
1663 /* Going up is simple: just call get_prev_frame enough times or
1664 until the initial frame is reached. */
1665 while (*level_offset_ptr > 0)
1667 struct frame_info *prev = get_prev_frame (frame);
1670 (*level_offset_ptr)--;
1674 /* Going down is just as simple. */
1675 while (*level_offset_ptr < 0)
1677 struct frame_info *next = get_next_frame (frame);
1680 (*level_offset_ptr)++;
1687 /* The "select_frame" command. With no argument this is a NOP.
1688 Select the frame at level LEVEL_EXP if it is a valid level.
1689 Otherwise, treat LEVEL_EXP as an address expression and select it.
1691 See parse_frame_specification for more info on proper frame
1695 select_frame_command (char *level_exp, int from_tty)
1697 select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
1700 /* The "frame" command. With no argument, print the selected frame
1701 briefly. With an argument, behave like select_frame and then print
1702 the selected frame. */
1705 frame_command (char *level_exp, int from_tty)
1707 select_frame_command (level_exp, from_tty);
1708 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1711 /* The XDB Compatibility command to print the current frame. */
1714 current_frame_command (char *level_exp, int from_tty)
1716 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC);
1719 /* Select the frame up one or COUNT_EXP stack levels from the
1720 previously selected frame, and print it briefly. */
1723 up_silently_base (char *count_exp)
1725 struct frame_info *frame;
1729 count = parse_and_eval_long (count_exp);
1731 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
1732 if (count != 0 && count_exp == NULL)
1733 error (_("Initial frame selected; you cannot go up."));
1734 select_frame (frame);
1738 up_silently_command (char *count_exp, int from_tty)
1740 up_silently_base (count_exp);
1744 up_command (char *count_exp, int from_tty)
1746 up_silently_base (count_exp);
1747 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1750 /* Select the frame down one or COUNT_EXP stack levels from the previously
1751 selected frame, and print it briefly. */
1754 down_silently_base (char *count_exp)
1756 struct frame_info *frame;
1759 count = -parse_and_eval_long (count_exp);
1761 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
1762 if (count != 0 && count_exp == NULL)
1764 /* We only do this if COUNT_EXP is not specified. That way
1765 "down" means to really go down (and let me know if that is
1766 impossible), but "down 9999" can be used to mean go all the
1767 way down without getting an error. */
1769 error (_("Bottom (innermost) frame selected; you cannot go down."));
1772 select_frame (frame);
1776 down_silently_command (char *count_exp, int from_tty)
1778 down_silently_base (count_exp);
1782 down_command (char *count_exp, int from_tty)
1784 down_silently_base (count_exp);
1785 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1790 return_command (char *retval_exp, int from_tty)
1792 struct frame_info *thisframe;
1793 struct symbol *thisfun;
1794 struct value *return_value = NULL;
1795 const char *query_prefix = "";
1797 thisframe = get_selected_frame ("No selected frame.");
1798 thisfun = get_frame_function (thisframe);
1800 /* Compute the return value. If the computation triggers an error,
1801 let it bail. If the return type can't be handled, set
1802 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1806 struct type *return_type = NULL;
1808 /* Compute the return value. Should the computation fail, this
1809 call throws an error. */
1810 return_value = parse_and_eval (retval_exp);
1812 /* Cast return value to the return type of the function. Should
1813 the cast fail, this call throws an error. */
1814 if (thisfun != NULL)
1815 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1816 if (return_type == NULL)
1817 return_type = builtin_type (get_frame_arch (thisframe))->builtin_int;
1818 CHECK_TYPEDEF (return_type);
1819 return_value = value_cast (return_type, return_value);
1821 /* Make sure the value is fully evaluated. It may live in the
1822 stack frame we're about to pop. */
1823 if (value_lazy (return_value))
1824 value_fetch_lazy (return_value);
1826 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1827 /* If the return-type is "void", don't try to find the
1828 return-value's location. However, do still evaluate the
1829 return expression so that, even when the expression result
1830 is discarded, side effects such as "return i++" still
1832 return_value = NULL;
1833 else if (using_struct_return (SYMBOL_TYPE (thisfun), return_type))
1836 The location at which to store the function's return value is unknown.\n\
1837 If you continue, the return value that you specified will be ignored.\n";
1838 return_value = NULL;
1842 /* Does an interactive user really want to do this? Include
1843 information, such as how well GDB can handle the return value, in
1844 the query message. */
1848 if (thisfun == NULL)
1849 confirmed = query (_("%sMake selected stack frame return now? "),
1852 confirmed = query (_("%sMake %s return now? "), query_prefix,
1853 SYMBOL_PRINT_NAME (thisfun));
1855 error (_("Not confirmed"));
1858 /* Discard the selected frame and all frames inner-to it. */
1859 frame_pop (get_selected_frame (NULL));
1861 /* Store RETURN_VALUE in the just-returned register set. */
1862 if (return_value != NULL)
1864 struct type *return_type = value_type (return_value);
1865 struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ());
1866 gdb_assert (gdbarch_return_value (gdbarch, SYMBOL_TYPE (thisfun),
1867 return_type, NULL, NULL, NULL)
1868 == RETURN_VALUE_REGISTER_CONVENTION);
1869 gdbarch_return_value (gdbarch, SYMBOL_TYPE (thisfun), return_type,
1870 get_current_regcache (), NULL /*read*/,
1871 value_contents (return_value) /*write*/);
1874 /* If we are at the end of a call dummy now, pop the dummy frame
1876 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1877 frame_pop (get_current_frame ());
1879 /* If interactive, print the frame that is now current. */
1881 frame_command ("0", 1);
1883 select_frame_command ("0", 0);
1886 /* Sets the scope to input function name, provided that the function
1887 is within the current stack frame */
1889 struct function_bounds
1891 CORE_ADDR low, high;
1895 func_command (char *arg, int from_tty)
1897 struct frame_info *frame;
1899 struct symtabs_and_lines sals;
1902 struct function_bounds *func_bounds = NULL;
1907 frame = parse_frame_specification ("0");
1908 sals = decode_line_spec (arg, 1);
1909 func_bounds = (struct function_bounds *) xmalloc (
1910 sizeof (struct function_bounds) * sals.nelts);
1911 for (i = 0; (i < sals.nelts && !found); i++)
1913 if (sals.sals[i].pc == 0
1914 || find_pc_partial_function (sals.sals[i].pc, NULL,
1915 &func_bounds[i].low,
1916 &func_bounds[i].high) == 0)
1918 func_bounds[i].low = func_bounds[i].high = 0;
1924 for (i = 0; (i < sals.nelts && !found); i++)
1925 found = (get_frame_pc (frame) >= func_bounds[i].low
1926 && get_frame_pc (frame) < func_bounds[i].high);
1930 frame = find_relative_frame (frame, &level);
1933 while (!found && level == 0);
1936 xfree (func_bounds);
1939 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
1940 else if (frame != get_selected_frame (NULL))
1941 select_and_print_frame (frame);
1944 /* Gets the language of the current frame. */
1947 get_frame_language (void)
1949 struct frame_info *frame = deprecated_safe_get_selected_frame ();
1953 /* We determine the current frame language by looking up its
1954 associated symtab. To retrieve this symtab, we use the frame
1955 PC. However we cannot use the frame PC as is, because it
1956 usually points to the instruction following the "call", which
1957 is sometimes the first instruction of another function. So
1958 we rely on get_frame_address_in_block(), it provides us with
1959 a PC that is guaranteed to be inside the frame's code
1961 CORE_ADDR pc = get_frame_address_in_block (frame);
1962 struct symtab *s = find_pc_symtab (pc);
1968 return language_unknown;
1972 /* Provide a prototype to silence -Wmissing-prototypes. */
1973 void _initialize_stack (void);
1976 _initialize_stack (void)
1979 backtrace_limit = 30;
1982 add_com ("return", class_stack, return_command, _("\
1983 Make selected stack frame return to its caller.\n\
1984 Control remains in the debugger, but when you continue\n\
1985 execution will resume in the frame above the one now selected.\n\
1986 If an argument is given, it is an expression for the value to return."));
1988 add_com ("up", class_stack, up_command, _("\
1989 Select and print stack frame that called this one.\n\
1990 An argument says how many frames up to go."));
1991 add_com ("up-silently", class_support, up_silently_command, _("\
1992 Same as the `up' command, but does not print anything.\n\
1993 This is useful in command scripts."));
1995 add_com ("down", class_stack, down_command, _("\
1996 Select and print stack frame called by this one.\n\
1997 An argument says how many frames down to go."));
1998 add_com_alias ("do", "down", class_stack, 1);
1999 add_com_alias ("dow", "down", class_stack, 1);
2000 add_com ("down-silently", class_support, down_silently_command, _("\
2001 Same as the `down' command, but does not print anything.\n\
2002 This is useful in command scripts."));
2004 add_com ("frame", class_stack, frame_command, _("\
2005 Select and print a stack frame.\n\
2006 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2007 An argument specifies the frame to select.\n\
2008 It can be a stack frame number or the address of the frame.\n\
2009 With argument, nothing is printed if input is coming from\n\
2010 a command file or a user-defined command."));
2012 add_com_alias ("f", "frame", class_stack, 1);
2016 add_com ("L", class_stack, current_frame_command,
2017 _("Print the current stack frame.\n"));
2018 add_com_alias ("V", "frame", class_stack, 1);
2020 add_com ("select-frame", class_stack, select_frame_command, _("\
2021 Select a stack frame without printing anything.\n\
2022 An argument specifies the frame to select.\n\
2023 It can be a stack frame number or the address of the frame.\n"));
2025 add_com ("backtrace", class_stack, backtrace_command, _("\
2026 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2027 With a negative argument, print outermost -COUNT frames.\n\
2028 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2029 add_com_alias ("bt", "backtrace", class_stack, 0);
2032 add_com_alias ("t", "backtrace", class_stack, 0);
2033 add_com ("T", class_stack, backtrace_full_command, _("\
2034 Print backtrace of all stack frames, or innermost COUNT frames \n\
2035 and the values of the local variables.\n\
2036 With a negative argument, print outermost -COUNT frames.\n\
2037 Usage: T <count>\n"));
2040 add_com_alias ("where", "backtrace", class_alias, 0);
2041 add_info ("stack", backtrace_command,
2042 _("Backtrace of the stack, or innermost COUNT frames."));
2043 add_info_alias ("s", "stack", 1);
2044 add_info ("frame", frame_info,
2045 _("All about selected stack frame, or frame at ADDR."));
2046 add_info_alias ("f", "frame", 1);
2047 add_info ("locals", locals_info,
2048 _("Local variables of current stack frame."));
2049 add_info ("args", args_info,
2050 _("Argument variables of current stack frame."));
2052 add_com ("l", class_info, args_plus_locals_info,
2053 _("Argument and local variables of current stack frame."));
2056 add_com ("func", class_stack, func_command, _("\
2057 Select the stack frame that contains <func>.\n\
2058 Usage: func <name>\n"));
2060 add_info ("catch", catch_info,
2061 _("Exceptions that can be caught in the current stack frame."));
2063 add_setshow_enum_cmd ("frame-arguments", class_stack,
2064 print_frame_arguments_choices, &print_frame_arguments,
2065 _("Set printing of non-scalar frame arguments"),
2066 _("Show printing of non-scalar frame arguments"),
2067 NULL, NULL, NULL, &setprintlist, &showprintlist);
2070 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, _(\
2071 "Specify maximum number of frames for \"backtrace\" to print by default."),
2073 add_info ("backtrace-limit", backtrace_limit_info, _("\
2074 The maximum number of frames for \"backtrace\" to print by default."));