1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
5 Free Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
28 #include "expression.h"
35 #include "breakpoint.h"
42 #include "dictionary.h"
43 #include "exceptions.h"
44 #include "reggroups.h"
49 #include "gdb_assert.h"
51 #include "gdb_string.h"
53 void (*deprecated_selected_frame_level_changed_hook) (int);
55 /* Prototypes for local functions. */
57 static void print_frame_local_vars (struct frame_info *, int,
60 static void print_frame (struct frame_info *frame, int print_level,
61 enum print_what print_what, int print_args,
62 struct symtab_and_line sal);
64 static void set_current_sal_from_frame (struct frame_info *, int);
66 /* Zero means do things normally; we are interacting directly with the
67 user. One means print the full filename and linenumber when a
68 frame is printed, and do so in a format emacs18/emacs19.22 can
69 parse. Two means print similar annotations, but in many more
70 cases and in a slightly different syntax. */
72 int annotation_level = 0;
75 struct print_stack_frame_args
77 struct frame_info *frame;
79 enum print_what print_what;
83 /* Show or print the frame arguments; stub for catch_errors. */
86 print_stack_frame_stub (void *args)
88 struct print_stack_frame_args *p = args;
89 int center = (p->print_what == SRC_LINE || p->print_what == SRC_AND_LOC);
91 print_frame_info (p->frame, p->print_level, p->print_what, p->print_args);
92 set_current_sal_from_frame (p->frame, center);
96 /* Show or print a stack frame FRAME briefly. The output is format
97 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
98 relative level, function name, argument list, and file name and
99 line number. If the frame's PC is not at the beginning of the
100 source line, the actual PC is printed at the beginning. */
103 print_stack_frame (struct frame_info *frame, int print_level,
104 enum print_what print_what)
106 struct print_stack_frame_args args;
109 args.print_level = print_level;
110 args.print_what = print_what;
113 catch_errors (print_stack_frame_stub, &args, "", RETURN_MASK_ALL);
116 struct print_args_args
119 struct frame_info *frame;
120 struct ui_file *stream;
123 static int print_args_stub (void *args);
125 /* Print nameless arguments of frame FRAME on STREAM, where START is
126 the offset of the first nameless argument, and NUM is the number of
127 nameless arguments to print. FIRST is nonzero if this is the first
128 argument (not just the first nameless argument). */
131 print_frame_nameless_args (struct frame_info *frame, long start, int num,
132 int first, struct ui_file *stream)
138 for (i = 0; i < num; i++)
141 argsaddr = get_frame_args_address (frame);
144 arg_value = read_memory_integer (argsaddr + start, sizeof (int));
146 fprintf_filtered (stream, ", ");
147 fprintf_filtered (stream, "%ld", arg_value);
149 start += sizeof (int);
153 /* Print the arguments of frame FRAME on STREAM, given the function
154 FUNC running in that frame (as a symbol), where NUM is the number
155 of arguments according to the stack frame (or -1 if the number of
156 arguments is unknown). */
158 /* Note that currently the "number of argumentss according to the
159 stack frame" is only known on VAX where i refers to the "number of
160 ints of argumentss according to the stack frame". */
163 print_frame_args (struct symbol *func, struct frame_info *frame,
164 int num, struct ui_file *stream)
167 /* Offset of next stack argument beyond the one we have seen that is
168 at the highest offset, or -1 if we haven't come to a stack
170 long highest_offset = -1;
171 /* Number of ints of arguments that we have printed so far. */
172 int args_printed = 0;
173 struct cleanup *old_chain, *list_chain;
174 struct ui_stream *stb;
176 stb = ui_out_stream_new (uiout);
177 old_chain = make_cleanup_ui_out_stream_delete (stb);
181 struct block *b = SYMBOL_BLOCK_VALUE (func);
182 struct dict_iterator iter;
186 ALL_BLOCK_SYMBOLS (b, iter, sym)
190 /* Keep track of the highest stack argument offset seen, and
191 skip over any kinds of symbols we don't care about. */
193 switch (SYMBOL_CLASS (sym))
198 long current_offset = SYMBOL_VALUE (sym);
199 int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
201 /* Compute address of next argument by adding the size of
202 this argument and rounding to an int boundary. */
204 ((current_offset + arg_size + sizeof (int) - 1)
205 & ~(sizeof (int) - 1));
207 /* If this is the highest offset seen yet, set
209 if (highest_offset == -1
210 || (current_offset > highest_offset))
211 highest_offset = current_offset;
213 /* Add the number of ints we're about to print to
215 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
218 /* We care about types of symbols, but don't need to
219 keep track of stack offsets in them. */
221 case LOC_REGPARM_ADDR:
223 case LOC_BASEREG_ARG:
224 case LOC_COMPUTED_ARG:
228 if (SYMBOL_IS_ARGUMENT (sym))
231 /* Other types of symbols we just skip over. */
235 /* We have to look up the symbol because arguments can have
236 two entries (one a parameter, one a local) and the one we
237 want is the local, which lookup_symbol will find for us.
238 This includes gcc1 (not gcc2) on SPARC when passing a
239 small structure and gcc2 when the argument type is float
240 and it is passed as a double and converted to float by
241 the prologue (in the latter case the type of the LOC_ARG
242 symbol is double and the type of the LOC_LOCAL symbol is
244 /* But if the parameter name is null, don't try it. Null
245 parameter names occur on the RS/6000, for traceback
246 tables. FIXME, should we even print them? */
248 if (*DEPRECATED_SYMBOL_NAME (sym))
251 nsym = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
252 b, VAR_DOMAIN, NULL, NULL);
253 if (SYMBOL_CLASS (nsym) == LOC_REGISTER)
255 /* There is a LOC_ARG/LOC_REGISTER pair. This means
256 that it was passed on the stack and loaded into a
257 register, or passed in a register and stored in a
258 stack slot. GDB 3.x used the LOC_ARG; GDB
259 4.0-4.11 used the LOC_REGISTER.
261 Reasons for using the LOC_ARG:
263 (1) Because find_saved_registers may be slow for
266 (2) Because registers are often re-used and stack
267 slots rarely (never?) are. Therefore using
268 the stack slot is much less likely to print
271 Reasons why we might want to use the LOC_REGISTER:
273 (1) So that the backtrace prints the same value
274 as "print foo". I see no compelling reason
275 why this needs to be the case; having the
276 backtrace print the value which was passed
277 in, and "print foo" print the value as
278 modified within the called function, makes
281 Additional note: It might be nice if "info args"
282 displayed both values.
284 One more note: There is a case with SPARC
285 structure passing where we need to use the
286 LOC_REGISTER, but this is dealt with by creating
287 a single LOC_REGPARM in symbol reading. */
289 /* Leave sym (the LOC_ARG) alone. */
296 /* Print the current arg. */
298 ui_out_text (uiout, ", ");
299 ui_out_wrap_hint (uiout, " ");
301 annotate_arg_begin ();
303 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
304 fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym),
305 SYMBOL_LANGUAGE (sym),
306 DMGL_PARAMS | DMGL_ANSI);
307 ui_out_field_stream (uiout, "name", stb);
308 annotate_arg_name_end ();
309 ui_out_text (uiout, "=");
311 /* Avoid value_print because it will deref ref parameters.
312 We just want to print their addresses. Print ??? for
313 args whose address we do not know. We pass 2 as
314 "recurse" to val_print because our standard indentation
315 here is 4 spaces, and val_print indents 2 for each
317 val = read_var_value (sym, frame);
319 annotate_arg_value (val == NULL ? NULL : value_type (val));
323 common_val_print (val, stb->stream, 0, 0, 2, Val_no_prettyprint);
324 ui_out_field_stream (uiout, "value", stb);
327 ui_out_text (uiout, "???");
329 /* Invoke ui_out_tuple_end. */
330 do_cleanups (list_chain);
338 /* Don't print nameless args in situations where we don't know
339 enough about the stack to find them. */
344 if (highest_offset == -1)
345 start = FRAME_ARGS_SKIP;
347 start = highest_offset;
349 print_frame_nameless_args (frame, start, num - args_printed,
353 do_cleanups (old_chain);
356 /* Stub for catch_errors. */
359 print_args_stub (void *args)
361 struct print_args_args *p = args;
364 if (FRAME_NUM_ARGS_P ())
366 numargs = FRAME_NUM_ARGS (p->frame);
367 gdb_assert (numargs >= 0);
371 print_frame_args (p->func, p->frame, numargs, p->stream);
375 /* Set the current source and line to the location given by frame
376 FRAME, if possible. When CENTER is true, adjust so the relevant
377 line is in the center of the next 'list'. */
380 set_current_sal_from_frame (struct frame_info *frame, int center)
382 struct symtab_and_line sal;
384 find_frame_sal (frame, &sal);
388 sal.line = max (sal.line - get_lines_to_list () / 2, 1);
389 set_current_source_symtab_and_line (&sal);
393 /* Print information about frame FRAME. The output is format according
394 to PRINT_LEVEL and PRINT_WHAT and PRINT ARGS. The meaning of
397 SRC_LINE: Print only source line.
398 LOCATION: Print only location.
399 LOC_AND_SRC: Print location and source line.
401 Used in "where" output, and to emit breakpoint or step
405 print_frame_info (struct frame_info *frame, int print_level,
406 enum print_what print_what, int print_args)
408 struct symtab_and_line sal;
412 if (get_frame_type (frame) == DUMMY_FRAME
413 || get_frame_type (frame) == SIGTRAMP_FRAME)
415 struct cleanup *uiout_cleanup
416 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
418 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
419 get_frame_pc (frame));
421 /* Do this regardless of SOURCE because we don't have any source
422 to list for this frame. */
425 ui_out_text (uiout, "#");
426 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
427 frame_relative_level (frame));
429 if (ui_out_is_mi_like_p (uiout))
431 annotate_frame_address ();
432 ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame));
433 annotate_frame_address_end ();
436 if (get_frame_type (frame) == DUMMY_FRAME)
438 annotate_function_call ();
439 ui_out_field_string (uiout, "func", "<function called from gdb>");
441 else if (get_frame_type (frame) == SIGTRAMP_FRAME)
443 annotate_signal_handler_caller ();
444 ui_out_field_string (uiout, "func", "<signal handler called>");
446 ui_out_text (uiout, "\n");
447 annotate_frame_end ();
449 do_cleanups (uiout_cleanup);
453 /* If FRAME is not the innermost frame, that normally means that
454 FRAME->pc points to *after* the call instruction, and we want to
455 get the line containing the call, never the next line. But if
456 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
457 next frame was not entered as the result of a call, and we want
458 to get the line containing FRAME->pc. */
459 find_frame_sal (frame, &sal);
461 location_print = (print_what == LOCATION
462 || print_what == LOC_AND_ADDRESS
463 || print_what == SRC_AND_LOC);
465 if (location_print || !sal.symtab)
466 print_frame (frame, print_level, print_what, print_args, sal);
468 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
470 if (source_print && sal.symtab)
473 int mid_statement = ((print_what == SRC_LINE)
474 && (get_frame_pc (frame) != sal.pc));
476 if (annotation_level)
477 done = identify_source_line (sal.symtab, sal.line, mid_statement,
478 get_frame_pc (frame));
481 if (deprecated_print_frame_info_listing_hook)
482 deprecated_print_frame_info_listing_hook (sal.symtab,
487 /* We used to do this earlier, but that is clearly
488 wrong. This function is used by many different
489 parts of gdb, including normal_stop in infrun.c,
490 which uses this to print out the current PC
491 when we stepi/nexti into the middle of a source
492 line. Only the command line really wants this
493 behavior. Other UIs probably would like the
494 ability to decide for themselves if it is desired. */
495 if (addressprint && mid_statement)
497 ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame));
498 ui_out_text (uiout, "\t");
501 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
506 if (print_what != LOCATION)
507 set_default_breakpoint (1, get_frame_pc (frame), sal.symtab, sal.line);
509 annotate_frame_end ();
511 gdb_flush (gdb_stdout);
515 print_frame (struct frame_info *frame, int print_level,
516 enum print_what print_what, int print_args,
517 struct symtab_and_line sal)
520 char *funname = NULL;
521 enum language funlang = language_unknown;
522 struct ui_stream *stb;
523 struct cleanup *old_chain, *list_chain;
525 stb = ui_out_stream_new (uiout);
526 old_chain = make_cleanup_ui_out_stream_delete (stb);
528 func = find_pc_function (get_frame_address_in_block (frame));
531 /* In certain pathological cases, the symtabs give the wrong
532 function (when we are in the first function in a file which
533 is compiled without debugging symbols, the previous function
534 is compiled with debugging symbols, and the "foo.o" symbol
535 that is supposed to tell us where the file with debugging
536 symbols ends has been truncated by ar because it is longer
537 than 15 characters). This also occurs if the user uses asm()
538 to create a function but not stabs for it (in a file compiled
541 So look in the minimal symbol tables as well, and if it comes
542 up with a larger address for the function use that instead.
543 I don't think this can ever cause any problems; there
544 shouldn't be any minimal symbols in the middle of a function;
545 if this is ever changed many parts of GDB will need to be
546 changed (and we'll create a find_pc_minimal_function or some
549 struct minimal_symbol *msymbol =
550 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
553 && (SYMBOL_VALUE_ADDRESS (msymbol)
554 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
556 /* We also don't know anything about the function besides
557 its address and name. */
559 funname = DEPRECATED_SYMBOL_NAME (msymbol);
560 funlang = SYMBOL_LANGUAGE (msymbol);
564 funname = DEPRECATED_SYMBOL_NAME (func);
565 funlang = SYMBOL_LANGUAGE (func);
566 if (funlang == language_cplus)
568 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
569 to display the demangled name that we already have
570 stored in the symbol table, but we stored a version
571 with DMGL_PARAMS turned on, and here we don't want to
572 display parameters. So call the demangler again, with
575 Yes, printf_symbol_filtered() will again try to
576 demangle the name on the fly, but the issue is that
577 if cplus_demangle() fails here, it will fail there
578 too. So we want to catch the failure (where DEMANGLED
579 is NULL below) here, while we still have our hands on
580 the function symbol.) */
581 char *demangled = cplus_demangle (funname, DMGL_ANSI);
582 if (demangled == NULL)
583 /* If the demangler fails, try the demangled name from
584 the symbol table. That'll have parameters, but
585 that's preferable to displaying a mangled name. */
586 funname = SYMBOL_PRINT_NAME (func);
592 struct minimal_symbol *msymbol =
593 lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
597 funname = DEPRECATED_SYMBOL_NAME (msymbol);
598 funlang = SYMBOL_LANGUAGE (msymbol);
602 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
603 get_frame_pc (frame));
605 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
609 ui_out_text (uiout, "#");
610 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
611 frame_relative_level (frame));
614 if (get_frame_pc (frame) != sal.pc || !sal.symtab
615 || print_what == LOC_AND_ADDRESS)
617 annotate_frame_address ();
618 ui_out_field_core_addr (uiout, "addr", get_frame_pc (frame));
619 annotate_frame_address_end ();
620 ui_out_text (uiout, " in ");
622 annotate_frame_function_name ();
623 fprintf_symbol_filtered (stb->stream, funname ? funname : "??",
625 ui_out_field_stream (uiout, "func", stb);
626 ui_out_wrap_hint (uiout, " ");
627 annotate_frame_args ();
629 ui_out_text (uiout, " (");
632 struct print_args_args args;
633 struct cleanup *args_list_chain;
636 args.stream = gdb_stdout;
637 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
638 catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL);
639 /* FIXME: ARGS must be a list. If one argument is a string it
640 will have " that will not be properly escaped. */
641 /* Invoke ui_out_tuple_end. */
642 do_cleanups (args_list_chain);
645 ui_out_text (uiout, ")");
646 if (sal.symtab && sal.symtab->filename)
648 annotate_frame_source_begin ();
649 ui_out_wrap_hint (uiout, " ");
650 ui_out_text (uiout, " at ");
651 annotate_frame_source_file ();
652 ui_out_field_string (uiout, "file", sal.symtab->filename);
653 if (ui_out_is_mi_like_p (uiout))
655 const char *fullname = symtab_to_fullname (sal.symtab);
656 if (fullname != NULL)
657 ui_out_field_string (uiout, "fullname", fullname);
659 annotate_frame_source_file_end ();
660 ui_out_text (uiout, ":");
661 annotate_frame_source_line ();
662 ui_out_field_int (uiout, "line", sal.line);
663 annotate_frame_source_end ();
666 if (!funname || (!sal.symtab || !sal.symtab->filename))
669 char *lib = PC_SOLIB (get_frame_pc (frame));
671 char *lib = solib_address (get_frame_pc (frame));
675 annotate_frame_where ();
676 ui_out_wrap_hint (uiout, " ");
677 ui_out_text (uiout, " from ");
678 ui_out_field_string (uiout, "from", lib);
682 /* do_cleanups will call ui_out_tuple_end() for us. */
683 do_cleanups (list_chain);
684 ui_out_text (uiout, "\n");
685 do_cleanups (old_chain);
688 /* Show the frame info. If this is the tui, it will be shown in the
689 source display otherwise, nothing is done. */
692 show_stack_frame (struct frame_info *frame)
697 /* Read a frame specification in whatever the appropriate format is
698 from FRAME_EXP. Call error(), printing MESSAGE, if the
699 specification is in any way invalid (so this function never returns
700 NULL). When SEPECTED_P is non-NULL set its target to indicate that
701 the default selected frame was used. */
703 static struct frame_info *
704 parse_frame_specification_1 (const char *frame_exp, const char *message,
705 int *selected_frame_p)
708 struct value *args[4];
709 CORE_ADDR addrs[ARRAY_SIZE (args)];
711 if (frame_exp == NULL)
716 struct cleanup *tmp_cleanup;
722 struct cleanup *cleanup;
725 /* Skip leading white space, bail of EOL. */
726 while (isspace (*frame_exp))
731 /* Parse the argument, extract it, save it. */
735 addr_string = savestring (frame_exp, p - frame_exp);
737 cleanup = make_cleanup (xfree, addr_string);
739 /* NOTE: Parse and evaluate expression, but do not use
740 functions such as parse_and_eval_long or
741 parse_and_eval_address to also extract the value.
742 Instead value_as_long and value_as_address are used.
743 This avoids problems with expressions that contain
745 if (numargs >= ARRAY_SIZE (args))
746 error (_("Too many args in frame specification"));
747 args[numargs++] = parse_and_eval (addr_string);
749 do_cleanups (cleanup);
753 /* If no args, default to the selected frame. */
756 if (selected_frame_p != NULL)
757 (*selected_frame_p) = 1;
758 return get_selected_frame (message);
761 /* None of the remaining use the selected frame. */
762 if (selected_frame_p != NULL)
763 (*selected_frame_p) = 0;
765 /* Assume the single arg[0] is an integer, and try using that to
766 select a frame relative to current. */
769 struct frame_info *fid;
770 int level = value_as_long (args[0]);
771 fid = find_relative_frame (get_current_frame (), &level);
773 /* find_relative_frame was successful */
777 /* Convert each value into a corresponding address. */
780 for (i = 0; i < numargs; i++)
781 addrs[i] = value_as_address (args[0]);
784 /* Assume that the single arg[0] is an address, use that to identify
785 a frame with a matching ID. Should this also accept stack/pc or
789 struct frame_id id = frame_id_build_wild (addrs[0]);
790 struct frame_info *fid;
792 /* If (s)he specifies the frame with an address, he deserves
793 what (s)he gets. Still, give the highest one that matches.
794 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
796 for (fid = get_current_frame ();
798 fid = get_prev_frame (fid))
800 if (frame_id_eq (id, get_frame_id (fid)))
802 while (frame_id_eq (id, frame_unwind_id (fid)))
803 fid = get_prev_frame (fid);
809 /* We couldn't identify the frame as an existing frame, but
810 perhaps we can create one with a single argument. */
812 return create_new_frame (addrs[0], 0);
813 else if (numargs == 2)
814 return create_new_frame (addrs[0], addrs[1]);
816 error (_("Too many args in frame specification"));
819 static struct frame_info *
820 parse_frame_specification (char *frame_exp)
822 return parse_frame_specification_1 (frame_exp, NULL, NULL);
825 /* Print verbosely the selected frame or the frame at address
826 ADDR_EXP. Absolutely all information in the frame is printed. */
829 frame_info (char *addr_exp, int from_tty)
831 struct frame_info *fi;
832 struct symtab_and_line sal;
835 struct frame_info *calling_frame_info;
836 int i, count, numregs;
838 enum language funlang = language_unknown;
839 const char *pc_regname;
840 int selected_frame_p;
842 fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
844 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
845 is not a good name. */
847 /* OK, this is weird. The PC_REGNUM hardware register's value can
848 easily not match that of the internal value returned by
850 pc_regname = REGISTER_NAME (PC_REGNUM);
852 /* But then, this is weird to. Even without PC_REGNUM, an
853 architectures will often have a hardware register called "pc",
854 and that register's value, again, can easily not match
858 find_frame_sal (fi, &sal);
859 func = get_frame_function (fi);
860 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
862 s = find_pc_symtab (get_frame_pc (fi));
865 /* It seems appropriate to use SYMBOL_PRINT_NAME() here, to
866 display the demangled name that we already have stored in the
867 symbol table, but we stored a version with DMGL_PARAMS turned
868 on, and here we don't want to display parameters. So call the
869 demangler again, with DMGL_ANSI only.
871 Yes, printf_symbol_filtered() will again try to demangle the
872 name on the fly, but the issue is that if cplus_demangle()
873 fails here, it will fail there too. So we want to catch the
874 failure (where DEMANGLED is NULL below) here, while we still
875 have our hands on the function symbol.) */
876 funname = DEPRECATED_SYMBOL_NAME (func);
877 funlang = SYMBOL_LANGUAGE (func);
878 if (funlang == language_cplus)
880 char *demangled = cplus_demangle (funname, DMGL_ANSI);
881 /* If the demangler fails, try the demangled name from the
882 symbol table. That'll have parameters, but that's
883 preferable to displaying a mangled name. */
884 if (demangled == NULL)
885 funname = SYMBOL_PRINT_NAME (func);
890 struct minimal_symbol *msymbol;
892 msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
895 funname = DEPRECATED_SYMBOL_NAME (msymbol);
896 funlang = SYMBOL_LANGUAGE (msymbol);
899 calling_frame_info = get_prev_frame (fi);
901 if (selected_frame_p && frame_relative_level (fi) >= 0)
903 printf_filtered (_("Stack level %d, frame at "),
904 frame_relative_level (fi));
908 printf_filtered (_("Stack frame at "));
910 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
911 printf_filtered (":\n");
912 printf_filtered (" %s = ", pc_regname);
913 deprecated_print_address_numeric (get_frame_pc (fi), 1, gdb_stdout);
918 printf_filtered (" in ");
919 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
920 DMGL_ANSI | DMGL_PARAMS);
924 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
925 puts_filtered ("; ");
927 printf_filtered ("saved %s ", pc_regname);
928 deprecated_print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout);
929 printf_filtered ("\n");
931 if (calling_frame_info)
933 printf_filtered (" called by frame at ");
934 deprecated_print_address_numeric (get_frame_base (calling_frame_info),
937 if (get_next_frame (fi) && calling_frame_info)
940 if (get_next_frame (fi))
942 printf_filtered (" caller of frame at ");
943 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi)), 1,
946 if (get_next_frame (fi) || calling_frame_info)
947 puts_filtered ("\n");
949 printf_filtered (" source language %s.\n",
950 language_str (s->language));
953 /* Address of the argument list for this frame, or 0. */
954 CORE_ADDR arg_list = get_frame_args_address (fi);
955 /* Number of args for this frame, or -1 if unknown. */
959 printf_filtered (" Arglist at unknown address.\n");
962 printf_filtered (" Arglist at ");
963 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
964 printf_filtered (",");
966 if (!FRAME_NUM_ARGS_P ())
969 puts_filtered (" args: ");
973 numargs = FRAME_NUM_ARGS (fi);
974 gdb_assert (numargs >= 0);
976 puts_filtered (" no args.");
977 else if (numargs == 1)
978 puts_filtered (" 1 arg: ");
980 printf_filtered (" %d args: ", numargs);
982 print_frame_args (func, fi, numargs, gdb_stdout);
983 puts_filtered ("\n");
987 /* Address of the local variables for this frame, or 0. */
988 CORE_ADDR arg_list = get_frame_locals_address (fi);
991 printf_filtered (" Locals at unknown address,");
994 printf_filtered (" Locals at ");
995 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
996 printf_filtered (",");
1000 /* Print as much information as possible on the location of all the
1003 enum lval_type lval;
1011 /* The sp is special; what's displayed isn't the save address, but
1012 the value of the previous frame's sp. This is a legacy thing,
1013 at one stage the frame cached the previous frame's SP instead
1014 of its address, hence it was easiest to just display the cached
1018 /* Find out the location of the saved stack pointer with out
1019 actually evaluating it. */
1020 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1022 if (!optimized && lval == not_lval)
1024 gdb_byte value[MAX_REGISTER_SIZE];
1026 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1028 /* NOTE: cagney/2003-05-22: This is assuming that the
1029 stack pointer was packed as an unsigned integer. That
1030 may or may not be valid. */
1031 sp = extract_unsigned_integer (value, register_size (current_gdbarch, SP_REGNUM));
1032 printf_filtered (" Previous frame's sp is ");
1033 deprecated_print_address_numeric (sp, 1, gdb_stdout);
1034 printf_filtered ("\n");
1037 else if (!optimized && lval == lval_memory)
1039 printf_filtered (" Previous frame's sp at ");
1040 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1041 printf_filtered ("\n");
1044 else if (!optimized && lval == lval_register)
1046 printf_filtered (" Previous frame's sp in %s\n",
1047 REGISTER_NAME (realnum));
1050 /* else keep quiet. */
1054 numregs = NUM_REGS + NUM_PSEUDO_REGS;
1055 for (i = 0; i < numregs; i++)
1057 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup))
1059 /* Find out the location of the saved register without
1060 fetching the corresponding value. */
1061 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1063 /* For moment, only display registers that were saved on the
1065 if (!optimized && lval == lval_memory)
1068 puts_filtered (" Saved registers:\n ");
1070 puts_filtered (",");
1072 printf_filtered (" %s at ", REGISTER_NAME (i));
1073 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1077 if (count || need_nl)
1078 puts_filtered ("\n");
1082 /* Print briefly all stack frames or just the innermost COUNT_EXP
1086 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1088 struct frame_info *fi;
1091 struct frame_info *trailing;
1094 if (!target_has_stack)
1095 error (_("No stack."));
1097 /* The following code must do two things. First, it must set the
1098 variable TRAILING to the frame from which we should start
1099 printing. Second, it must set the variable count to the number
1100 of frames which we should print, or -1 if all of them. */
1101 trailing = get_current_frame ();
1103 /* The target can be in a state where there is no valid frames
1104 (e.g., just connected). */
1105 if (trailing == NULL)
1106 error (_("No stack."));
1111 count = parse_and_eval_long (count_exp);
1114 struct frame_info *current;
1119 while (current && count--)
1122 current = get_prev_frame (current);
1125 /* Will stop when CURRENT reaches the top of the stack.
1126 TRAILING will be COUNT below it. */
1130 trailing = get_prev_frame (trailing);
1131 current = get_prev_frame (current);
1143 struct partial_symtab *ps;
1145 /* Read in symbols for all of the frames. Need to do this in a
1146 separate pass so that "Reading in symbols for xxx" messages
1147 don't screw up the appearance of the backtrace. Also if
1148 people have strong opinions against reading symbols for
1149 backtrace this may have to be an option. */
1151 for (fi = trailing; fi != NULL && i--; fi = get_prev_frame (fi))
1154 ps = find_pc_psymtab (get_frame_address_in_block (fi));
1156 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in. */
1160 for (i = 0, fi = trailing; fi && count--; i++, fi = get_prev_frame (fi))
1164 /* Don't use print_stack_frame; if an error() occurs it probably
1165 means further attempts to backtrace would fail (on the other
1166 hand, perhaps the code does or could be fixed to make sure
1167 the frame->prev field gets set to NULL in that case). */
1168 print_frame_info (fi, 1, LOCATION, 1);
1170 print_frame_local_vars (fi, 1, gdb_stdout);
1173 /* If we've stopped before the end, mention that. */
1175 printf_filtered (_("(More stack frames follow...)\n"));
1178 struct backtrace_command_args
1185 /* Stub for catch_errors. */
1188 backtrace_command_stub (void *data)
1190 struct backtrace_command_args *args = data;
1191 backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty);
1196 backtrace_command (char *arg, int from_tty)
1198 struct cleanup *old_chain = NULL;
1199 int fulltrace_arg = -1, arglen = 0, argc = 0;
1200 struct backtrace_command_args btargs;
1207 argv = buildargv (arg);
1208 old_chain = make_cleanup_freeargv (argv);
1210 for (i = 0; argv[i]; i++)
1214 for (j = 0; j < strlen (argv[i]); j++)
1215 argv[i][j] = tolower (argv[i][j]);
1217 if (fulltrace_arg < 0 && subset_compare (argv[i], "full"))
1218 fulltrace_arg = argc;
1221 arglen += strlen (argv[i]);
1226 if (fulltrace_arg >= 0)
1230 arg = xmalloc (arglen + 1);
1231 memset (arg, 0, arglen + 1);
1232 for (i = 0; i < (argc + 1); i++)
1234 if (i != fulltrace_arg)
1236 strcat (arg, argv[i]);
1246 btargs.count_exp = arg;
1247 btargs.show_locals = (fulltrace_arg >= 0);
1248 btargs.from_tty = from_tty;
1249 catch_errors (backtrace_command_stub, &btargs, "", RETURN_MASK_ERROR);
1251 if (fulltrace_arg >= 0 && arglen > 0)
1255 do_cleanups (old_chain);
1259 backtrace_full_command (char *arg, int from_tty)
1261 struct backtrace_command_args btargs;
1262 btargs.count_exp = arg;
1263 btargs.show_locals = 1;
1264 btargs.from_tty = from_tty;
1265 catch_errors (backtrace_command_stub, &btargs, "", RETURN_MASK_ERROR);
1269 /* Print the local variables of a block B active in FRAME on STREAM.
1270 Return 1 if any variables were printed; 0 otherwise. */
1273 print_block_frame_locals (struct block *b, struct frame_info *frame,
1274 int num_tabs, struct ui_file *stream)
1276 struct dict_iterator iter;
1278 int values_printed = 0;
1281 ALL_BLOCK_SYMBOLS (b, iter, sym)
1283 switch (SYMBOL_CLASS (sym))
1291 for (j = 0; j < num_tabs; j++)
1292 fputs_filtered ("\t", stream);
1293 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1294 fputs_filtered (" = ", stream);
1295 print_variable_value (sym, frame, stream);
1296 fprintf_filtered (stream, "\n");
1300 /* Ignore symbols which are not locals. */
1305 return values_printed;
1308 /* Same, but print labels. */
1311 print_block_frame_labels (struct block *b, int *have_default,
1312 struct ui_file *stream)
1314 struct dict_iterator iter;
1316 int values_printed = 0;
1318 ALL_BLOCK_SYMBOLS (b, iter, sym)
1320 if (strcmp (DEPRECATED_SYMBOL_NAME (sym), "default") == 0)
1326 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1328 struct symtab_and_line sal;
1329 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1331 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1334 fprintf_filtered (stream, " ");
1335 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
1337 fprintf_filtered (stream, " in file %s, line %d\n",
1338 sal.symtab->filename, sal.line);
1342 return values_printed;
1345 /* Print on STREAM all the local variables in frame FRAME, including
1346 all the blocks active in that frame at its current PC.
1348 Returns 1 if the job was done, or 0 if nothing was printed because
1349 we have no info on the function running in FRAME. */
1352 print_frame_local_vars (struct frame_info *frame, int num_tabs,
1353 struct ui_file *stream)
1355 struct block *block = get_frame_block (frame, 0);
1356 int values_printed = 0;
1360 fprintf_filtered (stream, "No symbol table info available.\n");
1366 if (print_block_frame_locals (block, frame, num_tabs, stream))
1368 /* After handling the function's top-level block, stop. Don't
1369 continue to its superblock, the block of per-file symbols. */
1370 if (BLOCK_FUNCTION (block))
1372 block = BLOCK_SUPERBLOCK (block);
1375 if (!values_printed)
1376 fprintf_filtered (stream, _("No locals.\n"));
1379 /* Same, but print labels. */
1382 print_frame_label_vars (struct frame_info *frame, int this_level_only,
1383 struct ui_file *stream)
1385 struct blockvector *bl;
1386 struct block *block = get_frame_block (frame, 0);
1387 int values_printed = 0;
1388 int index, have_default = 0;
1389 char *blocks_printed;
1390 CORE_ADDR pc = get_frame_pc (frame);
1394 fprintf_filtered (stream, "No symbol table info available.\n");
1398 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
1399 blocks_printed = alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1400 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1404 CORE_ADDR end = BLOCK_END (block) - 4;
1407 if (bl != blockvector_for_pc (end, &index))
1408 error (_("blockvector blotch"));
1409 if (BLOCKVECTOR_BLOCK (bl, index) != block)
1410 error (_("blockvector botch"));
1411 last_index = BLOCKVECTOR_NBLOCKS (bl);
1414 /* Don't print out blocks that have gone by. */
1415 while (index < last_index
1416 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
1419 while (index < last_index
1420 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
1422 if (blocks_printed[index] == 0)
1424 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index),
1425 &have_default, stream))
1427 blocks_printed[index] = 1;
1433 if (values_printed && this_level_only)
1436 /* After handling the function's top-level block, stop. Don't
1437 continue to its superblock, the block of per-file symbols. */
1438 if (BLOCK_FUNCTION (block))
1440 block = BLOCK_SUPERBLOCK (block);
1443 if (!values_printed && !this_level_only)
1444 fprintf_filtered (stream, _("No catches.\n"));
1448 locals_info (char *args, int from_tty)
1450 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
1455 catch_info (char *ignore, int from_tty)
1457 struct symtab_and_line *sal;
1459 /* Check for target support for exception handling */
1460 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
1463 /* Currently not handling this. Ideally, here we should
1464 interact with the C++ runtime system to find the list of
1465 active handlers, etc. */
1466 fprintf_filtered (gdb_stdout, _("\
1467 Info catch not supported with this target/compiler combination.\n"));
1471 /* Assume g++ compiled code; old GDB 4.16 behaviour. */
1472 print_frame_label_vars (get_selected_frame (_("No frame selected.")),
1478 print_frame_arg_vars (struct frame_info *frame, struct ui_file *stream)
1480 struct symbol *func = get_frame_function (frame);
1482 struct dict_iterator iter;
1483 struct symbol *sym, *sym2;
1484 int values_printed = 0;
1488 fprintf_filtered (stream, _("No symbol table info available.\n"));
1492 b = SYMBOL_BLOCK_VALUE (func);
1493 ALL_BLOCK_SYMBOLS (b, iter, sym)
1495 switch (SYMBOL_CLASS (sym))
1498 /* Don't worry about things which aren't arguments. */
1499 if (!SYMBOL_IS_ARGUMENT (sym))
1508 case LOC_REGPARM_ADDR:
1509 case LOC_BASEREG_ARG:
1510 case LOC_COMPUTED_ARG:
1512 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1513 fputs_filtered (" = ", stream);
1515 /* We have to look up the symbol because arguments can have
1516 two entries (one a parameter, one a local) and the one we
1517 want is the local, which lookup_symbol will find for us.
1518 This includes gcc1 (not gcc2) on the sparc when passing a
1519 small structure and gcc2 when the argument type is float
1520 and it is passed as a double and converted to float by
1521 the prologue (in the latter case the type of the LOC_ARG
1522 symbol is double and the type of the LOC_LOCAL symbol is
1523 float). There are also LOC_ARG/LOC_REGISTER pairs which
1524 are not combined in symbol-reading. */
1526 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
1527 b, VAR_DOMAIN, NULL, NULL);
1528 print_variable_value (sym2, frame, stream);
1529 fprintf_filtered (stream, "\n");
1534 if (!values_printed)
1535 fprintf_filtered (stream, _("No arguments.\n"));
1539 args_info (char *ignore, int from_tty)
1541 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
1547 args_plus_locals_info (char *ignore, int from_tty)
1549 args_info (ignore, from_tty);
1550 locals_info (ignore, from_tty);
1554 /* Select frame FRAME. Also print the stack frame and show the source
1555 if this is the tui version. */
1557 select_and_print_frame (struct frame_info *frame)
1559 select_frame (frame);
1561 print_stack_frame (frame, 1, SRC_AND_LOC);
1564 /* Return the symbol-block in which the selected frame is executing.
1565 Can return zero under various legitimate circumstances.
1567 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1568 code address within the block returned. We use this to decide
1569 which macros are in scope. */
1572 get_selected_block (CORE_ADDR *addr_in_block)
1574 if (!target_has_stack)
1577 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1578 a selected/current frame? Perhaps this function is called,
1579 indirectly, by WFI in "infrun.c" where avoiding the creation of
1580 an inner most frame is very important (it slows down single
1581 step). I suspect, though that this was true in the deep dark
1582 past but is no longer the case. A mindless look at all the
1583 callers tends to support this theory. I think we should be able
1584 to assume that there is always a selcted frame. */
1585 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1587 if (!deprecated_selected_frame)
1589 CORE_ADDR pc = read_pc ();
1590 if (addr_in_block != NULL)
1591 *addr_in_block = pc;
1592 return block_for_pc (pc);
1594 return get_frame_block (deprecated_selected_frame, addr_in_block);
1597 /* Find a frame a certain number of levels away from FRAME.
1598 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1599 Positive means go to earlier frames (up); negative, the reverse.
1600 The int that contains the number of levels is counted toward
1601 zero as the frames for those levels are found.
1602 If the top or bottom frame is reached, that frame is returned,
1603 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1604 how much farther the original request asked to go. */
1607 find_relative_frame (struct frame_info *frame, int *level_offset_ptr)
1609 /* Going up is simple: just call get_prev_frame enough times or
1610 until the initial frame is reached. */
1611 while (*level_offset_ptr > 0)
1613 struct frame_info *prev = get_prev_frame (frame);
1616 (*level_offset_ptr)--;
1620 /* Going down is just as simple. */
1621 while (*level_offset_ptr < 0)
1623 struct frame_info *next = get_next_frame (frame);
1626 (*level_offset_ptr)++;
1633 /* The "select_frame" command. With no argument this is a NOP.
1634 Select the frame at level LEVEL_EXP if it is a valid level.
1635 Otherwise, treat LEVEL_EXP as an address expression and select it.
1637 See parse_frame_specification for more info on proper frame
1641 select_frame_command (char *level_exp, int from_tty)
1643 select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
1646 /* The "frame" command. With no argument, print the selected frame
1647 briefly. With an argument, behave like select_frame and then print
1648 the selected frame. */
1651 frame_command (char *level_exp, int from_tty)
1653 select_frame_command (level_exp, from_tty);
1654 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1657 /* The XDB Compatibility command to print the current frame. */
1660 current_frame_command (char *level_exp, int from_tty)
1662 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC);
1665 /* Select the frame up one or COUNT_EXP stack levels from the
1666 previously selected frame, and print it briefly. */
1669 up_silently_base (char *count_exp)
1671 struct frame_info *frame;
1675 count = parse_and_eval_long (count_exp);
1677 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
1678 if (count != 0 && count_exp == NULL)
1679 error (_("Initial frame selected; you cannot go up."));
1680 select_frame (frame);
1684 up_silently_command (char *count_exp, int from_tty)
1686 up_silently_base (count_exp);
1690 up_command (char *count_exp, int from_tty)
1692 up_silently_base (count_exp);
1693 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1696 /* Select the frame down one or COUNT_EXP stack levels from the previously
1697 selected frame, and print it briefly. */
1700 down_silently_base (char *count_exp)
1702 struct frame_info *frame;
1705 count = -parse_and_eval_long (count_exp);
1707 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
1708 if (count != 0 && count_exp == NULL)
1710 /* We only do this if COUNT_EXP is not specified. That way
1711 "down" means to really go down (and let me know if that is
1712 impossible), but "down 9999" can be used to mean go all the
1713 way down without getting an error. */
1715 error (_("Bottom (innermost) frame selected; you cannot go down."));
1718 select_frame (frame);
1722 down_silently_command (char *count_exp, int from_tty)
1724 down_silently_base (count_exp);
1728 down_command (char *count_exp, int from_tty)
1730 down_silently_base (count_exp);
1731 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1736 return_command (char *retval_exp, int from_tty)
1738 struct symbol *thisfun;
1739 struct value *return_value = NULL;
1740 const char *query_prefix = "";
1742 thisfun = get_frame_function (get_selected_frame ("No selected frame."));
1744 /* Compute the return value. If the computation triggers an error,
1745 let it bail. If the return type can't be handled, set
1746 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1750 struct type *return_type = NULL;
1752 /* Compute the return value. Should the computation fail, this
1753 call throws an error. */
1754 return_value = parse_and_eval (retval_exp);
1756 /* Cast return value to the return type of the function. Should
1757 the cast fail, this call throws an error. */
1758 if (thisfun != NULL)
1759 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1760 if (return_type == NULL)
1761 return_type = builtin_type_int;
1762 CHECK_TYPEDEF (return_type);
1763 return_value = value_cast (return_type, return_value);
1765 /* Make sure the value is fully evaluated. It may live in the
1766 stack frame we're about to pop. */
1767 if (value_lazy (return_value))
1768 value_fetch_lazy (return_value);
1770 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1771 /* If the return-type is "void", don't try to find the
1772 return-value's location. However, do still evaluate the
1773 return expression so that, even when the expression result
1774 is discarded, side effects such as "return i++" still
1776 return_value = NULL;
1777 /* FIXME: cagney/2004-01-17: If the architecture implements both
1778 return_value and extract_returned_value_address, should allow
1779 "return" to work - don't set return_value to NULL. */
1780 else if (!gdbarch_return_value_p (current_gdbarch)
1781 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT
1782 || TYPE_CODE (return_type) == TYPE_CODE_UNION))
1784 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1785 code. Old architectures don't expect STORE_RETURN_VALUE
1786 to be called with with a small struct that needs to be
1787 stored in registers. Don't start doing it now. */
1789 A structure or union return type is not supported by this architecture.\n\
1790 If you continue, the return value that you specified will be ignored.\n";
1791 return_value = NULL;
1793 else if (using_struct_return (return_type, 0))
1796 The location at which to store the function's return value is unknown.\n\
1797 If you continue, the return value that you specified will be ignored.\n";
1798 return_value = NULL;
1802 /* Does an interactive user really want to do this? Include
1803 information, such as how well GDB can handle the return value, in
1804 the query message. */
1808 if (thisfun == NULL)
1809 confirmed = query (_("%sMake selected stack frame return now? "),
1812 confirmed = query (_("%sMake %s return now? "), query_prefix,
1813 SYMBOL_PRINT_NAME (thisfun));
1815 error (_("Not confirmed"));
1818 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1819 frame in turn, should this code just go straight to the relevant
1820 frame and pop that? */
1822 /* First discard all frames inner-to the selected frame (making the
1823 selected frame current). */
1825 struct frame_id selected_id = get_frame_id (get_selected_frame (NULL));
1826 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ())))
1828 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ())))
1829 /* Caught in the safety net, oops! We've gone way past the
1831 error (_("Problem while popping stack frames (corrupt stack?)"));
1832 frame_pop (get_current_frame ());
1836 /* Second discard the selected frame (which is now also the current
1838 frame_pop (get_current_frame ());
1840 /* Store RETURN_VAUE in the just-returned register set. */
1841 if (return_value != NULL)
1843 struct type *return_type = value_type (return_value);
1844 gdb_assert (gdbarch_return_value (current_gdbarch, return_type,
1846 == RETURN_VALUE_REGISTER_CONVENTION);
1847 gdbarch_return_value (current_gdbarch, return_type,
1848 current_regcache, NULL /*read*/,
1849 value_contents (return_value) /*write*/);
1852 /* If we are at the end of a call dummy now, pop the dummy frame
1854 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1855 frame_pop (get_current_frame ());
1857 /* If interactive, print the frame that is now current. */
1859 frame_command ("0", 1);
1861 select_frame_command ("0", 0);
1864 /* Sets the scope to input function name, provided that the function
1865 is within the current stack frame */
1867 struct function_bounds
1869 CORE_ADDR low, high;
1873 func_command (char *arg, int from_tty)
1875 struct frame_info *frame;
1877 struct symtabs_and_lines sals;
1880 struct function_bounds *func_bounds = NULL;
1885 frame = parse_frame_specification ("0");
1886 sals = decode_line_spec (arg, 1);
1887 func_bounds = (struct function_bounds *) xmalloc (
1888 sizeof (struct function_bounds) * sals.nelts);
1889 for (i = 0; (i < sals.nelts && !found); i++)
1891 if (sals.sals[i].pc == 0
1892 || find_pc_partial_function (sals.sals[i].pc, NULL,
1893 &func_bounds[i].low,
1894 &func_bounds[i].high) == 0)
1896 func_bounds[i].low = func_bounds[i].high = 0;
1902 for (i = 0; (i < sals.nelts && !found); i++)
1903 found = (get_frame_pc (frame) >= func_bounds[i].low
1904 && get_frame_pc (frame) < func_bounds[i].high);
1908 frame = find_relative_frame (frame, &level);
1911 while (!found && level == 0);
1914 xfree (func_bounds);
1917 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
1918 else if (frame != get_selected_frame (NULL))
1919 select_and_print_frame (frame);
1922 /* Gets the language of the current frame. */
1925 get_frame_language (void)
1927 struct frame_info *frame = deprecated_safe_get_selected_frame ();
1931 /* We determine the current frame language by looking up its
1932 associated symtab. To retrieve this symtab, we use the frame
1933 PC. However we cannot use the frame PC as is, because it
1934 usually points to the instruction following the "call", which
1935 is sometimes the first instruction of another function. So
1936 we rely on get_frame_address_in_block(), it provides us with
1937 a PC that is guaranteed to be inside the frame's code
1939 CORE_ADDR pc = get_frame_address_in_block (frame);
1940 struct symtab *s = find_pc_symtab (pc);
1946 return language_unknown;
1950 /* Provide a prototype to silence -Wmissing-prototypes. */
1951 void _initialize_stack (void);
1954 _initialize_stack (void)
1957 backtrace_limit = 30;
1960 add_com ("return", class_stack, return_command, _("\
1961 Make selected stack frame return to its caller.\n\
1962 Control remains in the debugger, but when you continue\n\
1963 execution will resume in the frame above the one now selected.\n\
1964 If an argument is given, it is an expression for the value to return."));
1966 add_com ("up", class_stack, up_command, _("\
1967 Select and print stack frame that called this one.\n\
1968 An argument says how many frames up to go."));
1969 add_com ("up-silently", class_support, up_silently_command, _("\
1970 Same as the `up' command, but does not print anything.\n\
1971 This is useful in command scripts."));
1973 add_com ("down", class_stack, down_command, _("\
1974 Select and print stack frame called by this one.\n\
1975 An argument says how many frames down to go."));
1976 add_com_alias ("do", "down", class_stack, 1);
1977 add_com_alias ("dow", "down", class_stack, 1);
1978 add_com ("down-silently", class_support, down_silently_command, _("\
1979 Same as the `down' command, but does not print anything.\n\
1980 This is useful in command scripts."));
1982 add_com ("frame", class_stack, frame_command, _("\
1983 Select and print a stack frame.\n\
1984 With no argument, print the selected stack frame. (See also \"info frame\").\n\
1985 An argument specifies the frame to select.\n\
1986 It can be a stack frame number or the address of the frame.\n\
1987 With argument, nothing is printed if input is coming from\n\
1988 a command file or a user-defined command."));
1990 add_com_alias ("f", "frame", class_stack, 1);
1994 add_com ("L", class_stack, current_frame_command,
1995 _("Print the current stack frame.\n"));
1996 add_com_alias ("V", "frame", class_stack, 1);
1998 add_com ("select-frame", class_stack, select_frame_command, _("\
1999 Select a stack frame without printing anything.\n\
2000 An argument specifies the frame to select.\n\
2001 It can be a stack frame number or the address of the frame.\n"));
2003 add_com ("backtrace", class_stack, backtrace_command, _("\
2004 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2005 With a negative argument, print outermost -COUNT frames.\n\
2006 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2007 add_com_alias ("bt", "backtrace", class_stack, 0);
2010 add_com_alias ("t", "backtrace", class_stack, 0);
2011 add_com ("T", class_stack, backtrace_full_command, _("\
2012 Print backtrace of all stack frames, or innermost COUNT frames \n\
2013 and the values of the local variables.\n\
2014 With a negative argument, print outermost -COUNT frames.\n\
2015 Usage: T <count>\n"));
2018 add_com_alias ("where", "backtrace", class_alias, 0);
2019 add_info ("stack", backtrace_command,
2020 _("Backtrace of the stack, or innermost COUNT frames."));
2021 add_info_alias ("s", "stack", 1);
2022 add_info ("frame", frame_info,
2023 _("All about selected stack frame, or frame at ADDR."));
2024 add_info_alias ("f", "frame", 1);
2025 add_info ("locals", locals_info,
2026 _("Local variables of current stack frame."));
2027 add_info ("args", args_info,
2028 _("Argument variables of current stack frame."));
2030 add_com ("l", class_info, args_plus_locals_info,
2031 _("Argument and local variables of current stack frame."));
2034 add_com ("func", class_stack, func_command, _("\
2035 Select the stack frame that contains <func>.\n\
2036 Usage: func <name>\n"));
2038 add_info ("catch", catch_info,
2039 _("Exceptions that can be caught in the current stack frame."));
2042 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, _(\
2043 "Specify maximum number of frames for \"backtrace\" to print by default."),
2045 add_info ("backtrace-limit", backtrace_limit_info, _("\
2046 The maximum number of frames for \"backtrace\" to print by default."));