1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 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., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
30 #include "expression.h"
37 #include "breakpoint.h"
44 #include "gdb_assert.h"
45 #include "dictionary.h"
46 #include "exceptions.h"
47 #include "reggroups.h"
51 /* Prototypes for exported functions. */
53 void args_info (char *, int);
55 void locals_info (char *, int);
57 void (*deprecated_selected_frame_level_changed_hook) (int);
59 void _initialize_stack (void);
61 /* Prototypes for local functions. */
63 static void down_command (char *, int);
65 static void down_silently_base (char *);
67 static void down_silently_command (char *, int);
69 static void up_command (char *, int);
71 static void up_silently_base (char *);
73 static void up_silently_command (char *, int);
75 void frame_command (char *, int);
77 static void current_frame_command (char *, int);
79 static void print_frame_arg_vars (struct frame_info *, struct ui_file *);
81 static void catch_info (char *, int);
83 static void args_plus_locals_info (char *, int);
85 static void print_frame_label_vars (struct frame_info *, int,
88 static void print_frame_local_vars (struct frame_info *, int,
91 static int print_block_frame_labels (struct block *, int *,
94 static int print_block_frame_locals (struct block *,
99 static void print_frame (struct frame_info *fi,
101 enum print_what print_what,
103 struct symtab_and_line sal);
105 static void set_current_sal_from_frame (struct frame_info *, int);
107 static void backtrace_command (char *, int);
109 static void frame_info (char *, int);
111 extern int addressprint; /* Print addresses, or stay symbolic only? */
113 /* Zero means do things normally; we are interacting directly with the
114 user. One means print the full filename and linenumber when a
115 frame is printed, and do so in a format emacs18/emacs19.22 can
116 parse. Two means print similar annotations, but in many more
117 cases and in a slightly different syntax. */
119 int annotation_level = 0;
122 struct print_stack_frame_args
124 struct frame_info *fi;
126 enum print_what print_what;
130 /* Show or print the frame arguments.
131 Pass the args the way catch_errors wants them. */
133 print_stack_frame_stub (void *args)
135 struct print_stack_frame_args *p = args;
136 int center = (p->print_what == SRC_LINE
137 || p->print_what == SRC_AND_LOC);
139 print_frame_info (p->fi, p->print_level, p->print_what, p->print_args);
140 set_current_sal_from_frame (p->fi, center);
144 /* Show or print a stack frame FI briefly. The output is format
145 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
146 relative level, function name, argument list, and file name and
147 line number. If the frame's PC is not at the beginning of the
148 source line, the actual PC is printed at the beginning. */
151 print_stack_frame (struct frame_info *fi, int print_level,
152 enum print_what print_what)
154 struct print_stack_frame_args args;
157 args.print_level = print_level;
158 args.print_what = print_what;
161 catch_errors (print_stack_frame_stub, (char *) &args, "", RETURN_MASK_ALL);
164 struct print_args_args
167 struct frame_info *fi;
168 struct ui_file *stream;
171 static int print_args_stub (void *);
173 /* Print nameless args on STREAM.
174 FI is the frameinfo for this frame, START is the offset
175 of the first nameless arg, and NUM is the number of nameless args to
176 print. FIRST is nonzero if this is the first argument (not just
177 the first nameless arg). */
180 print_frame_nameless_args (struct frame_info *fi, long start, int num,
181 int first, struct ui_file *stream)
187 for (i = 0; i < num; i++)
190 argsaddr = get_frame_args_address (fi);
193 arg_value = read_memory_integer (argsaddr + start, sizeof (int));
195 fprintf_filtered (stream, ", ");
196 fprintf_filtered (stream, "%ld", arg_value);
198 start += sizeof (int);
202 /* Print the arguments of a stack frame, given the function FUNC
203 running in that frame (as a symbol), the info on the frame,
204 and the number of args according to the stack frame (or -1 if unknown). */
206 /* References here and elsewhere to "number of args according to the
207 stack frame" appear in all cases to refer to "number of ints of args
208 according to the stack frame". At least for VAX, i386, isi. */
211 print_frame_args (struct symbol *func, struct frame_info *fi, int num,
212 struct ui_file *stream)
214 struct block *b = NULL;
216 struct dict_iterator iter;
219 /* Offset of next stack argument beyond the one we have seen that is
220 at the highest offset.
221 -1 if we haven't come to a stack argument yet. */
222 long highest_offset = -1;
224 /* Number of ints of arguments that we have printed so far. */
225 int args_printed = 0;
226 struct cleanup *old_chain, *list_chain;
227 struct ui_stream *stb;
229 stb = ui_out_stream_new (uiout);
230 old_chain = make_cleanup_ui_out_stream_delete (stb);
234 b = SYMBOL_BLOCK_VALUE (func);
236 ALL_BLOCK_SYMBOLS (b, iter, sym)
240 /* Keep track of the highest stack argument offset seen, and
241 skip over any kinds of symbols we don't care about. */
243 switch (SYMBOL_CLASS (sym))
248 long current_offset = SYMBOL_VALUE (sym);
249 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 highest_offset. */
258 if (highest_offset == -1
259 || (current_offset > highest_offset))
260 highest_offset = current_offset;
262 /* Add the number of ints we're about to print to args_printed. */
263 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
266 /* We care about types of symbols, but don't need to keep track of
267 stack offsets in them. */
269 case LOC_REGPARM_ADDR:
271 case LOC_BASEREG_ARG:
272 case LOC_COMPUTED_ARG:
275 /* Other types of symbols we just skip over. */
280 /* We have to look up the symbol because arguments can have
281 two entries (one a parameter, one a local) and the one we
282 want is the local, which lookup_symbol will find for us.
283 This includes gcc1 (not gcc2) on the sparc when passing a
284 small structure and gcc2 when the argument type is float
285 and it is passed as a double and converted to float by
286 the prologue (in the latter case the type of the LOC_ARG
287 symbol is double and the type of the LOC_LOCAL symbol is
289 /* But if the parameter name is null, don't try it.
290 Null parameter names occur on the RS/6000, for traceback tables.
291 FIXME, should we even print them? */
293 if (*DEPRECATED_SYMBOL_NAME (sym))
297 (DEPRECATED_SYMBOL_NAME (sym),
298 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
299 if (SYMBOL_CLASS (nsym) == LOC_REGISTER)
301 /* There is a LOC_ARG/LOC_REGISTER pair. This means that
302 it was passed on the stack and loaded into a register,
303 or passed in a register and stored in a stack slot.
304 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER.
306 Reasons for using the LOC_ARG:
307 (1) because find_saved_registers may be slow for remote
309 (2) because registers are often re-used and stack slots
310 rarely (never?) are. Therefore using the stack slot is
311 much less likely to print garbage.
313 Reasons why we might want to use the LOC_REGISTER:
314 (1) So that the backtrace prints the same value as
315 "print foo". I see no compelling reason why this needs
316 to be the case; having the backtrace print the value which
317 was passed in, and "print foo" print the value as modified
318 within the called function, makes perfect sense to me.
320 Additional note: It might be nice if "info args" displayed
322 One more note: There is a case with sparc structure passing
323 where we need to use the LOC_REGISTER, but this is dealt with
324 by creating a single LOC_REGPARM in symbol reading. */
326 /* Leave sym (the LOC_ARG) alone. */
333 /* Print the current arg. */
335 ui_out_text (uiout, ", ");
336 ui_out_wrap_hint (uiout, " ");
338 annotate_arg_begin ();
340 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
341 fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym),
342 SYMBOL_LANGUAGE (sym), DMGL_PARAMS | DMGL_ANSI);
343 ui_out_field_stream (uiout, "name", stb);
344 annotate_arg_name_end ();
345 ui_out_text (uiout, "=");
347 /* Avoid value_print because it will deref ref parameters. We just
348 want to print their addresses. Print ??? for args whose address
349 we do not know. We pass 2 as "recurse" to val_print because our
350 standard indentation here is 4 spaces, and val_print indents
351 2 for each recurse. */
352 val = read_var_value (sym, fi);
354 annotate_arg_value (val == NULL ? NULL : value_type (val));
358 common_val_print (val, stb->stream, 0, 0, 2, Val_no_prettyprint);
359 ui_out_field_stream (uiout, "value", stb);
362 ui_out_text (uiout, "???");
364 /* Invoke ui_out_tuple_end. */
365 do_cleanups (list_chain);
373 /* Don't print nameless args in situations where we don't know
374 enough about the stack to find them. */
379 if (highest_offset == -1)
380 start = FRAME_ARGS_SKIP;
382 start = highest_offset;
384 print_frame_nameless_args (fi, start, num - args_printed,
387 do_cleanups (old_chain);
390 /* Pass the args the way catch_errors wants them. */
393 print_args_stub (void *args)
396 struct print_args_args *p = (struct print_args_args *) args;
398 if (FRAME_NUM_ARGS_P ())
400 numargs = FRAME_NUM_ARGS (p->fi);
401 gdb_assert (numargs >= 0);
405 print_frame_args (p->func, p->fi, numargs, p->stream);
409 /* Set the current source and line to the location of the given
410 frame, if possible. When CENTER is true, adjust so the
411 relevant line is in the center of the next 'list'. */
414 set_current_sal_from_frame (struct frame_info *fi, int center)
416 struct symtab_and_line sal;
418 find_frame_sal (fi, &sal);
422 sal.line = max (sal.line - get_lines_to_list () / 2, 1);
423 set_current_source_symtab_and_line (&sal);
427 /* Print information about a frame for frame "fi" at level "level".
428 Used in "where" output, also used to emit breakpoint or step
430 LEVEL is the level of the frame, or -1 if it is the
431 innermost frame but we don't want to print the level.
432 The meaning of the SOURCE argument is:
433 SRC_LINE: Print only source line
434 LOCATION: Print only location
435 LOC_AND_SRC: Print location and source line. */
438 print_frame_info (struct frame_info *fi, int print_level,
439 enum print_what print_what, int print_args)
441 struct symtab_and_line sal;
445 if (get_frame_type (fi) == DUMMY_FRAME
446 || get_frame_type (fi) == SIGTRAMP_FRAME)
448 struct cleanup *uiout_cleanup
449 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
451 annotate_frame_begin (print_level ? frame_relative_level (fi) : 0,
454 /* Do this regardless of SOURCE because we don't have any source
455 to list for this frame. */
458 ui_out_text (uiout, "#");
459 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
460 frame_relative_level (fi));
462 if (ui_out_is_mi_like_p (uiout))
464 annotate_frame_address ();
465 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
466 annotate_frame_address_end ();
469 if (get_frame_type (fi) == DUMMY_FRAME)
471 annotate_function_call ();
472 ui_out_field_string (uiout, "func", "<function called from gdb>");
474 else if (get_frame_type (fi) == SIGTRAMP_FRAME)
476 annotate_signal_handler_caller ();
477 ui_out_field_string (uiout, "func", "<signal handler called>");
479 ui_out_text (uiout, "\n");
480 annotate_frame_end ();
482 do_cleanups (uiout_cleanup);
486 /* If fi is not the innermost frame, that normally means that fi->pc
487 points to *after* the call instruction, and we want to get the
488 line containing the call, never the next line. But if the next
489 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
490 was not entered as the result of a call, and we want to get the
491 line containing fi->pc. */
492 find_frame_sal (fi, &sal);
494 location_print = (print_what == LOCATION
495 || print_what == LOC_AND_ADDRESS
496 || print_what == SRC_AND_LOC);
498 if (location_print || !sal.symtab)
499 print_frame (fi, print_level, print_what, print_args, sal);
501 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
503 if (source_print && sal.symtab)
506 int mid_statement = ((print_what == SRC_LINE)
507 && (get_frame_pc (fi) != sal.pc));
509 if (annotation_level)
510 done = identify_source_line (sal.symtab, sal.line, mid_statement,
514 if (deprecated_print_frame_info_listing_hook)
515 deprecated_print_frame_info_listing_hook (sal.symtab,
520 /* We used to do this earlier, but that is clearly
521 wrong. This function is used by many different
522 parts of gdb, including normal_stop in infrun.c,
523 which uses this to print out the current PC
524 when we stepi/nexti into the middle of a source
525 line. Only the command line really wants this
526 behavior. Other UIs probably would like the
527 ability to decide for themselves if it is desired. */
528 if (addressprint && mid_statement)
530 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
531 ui_out_text (uiout, "\t");
534 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
539 if (print_what != LOCATION)
540 set_default_breakpoint (1, get_frame_pc (fi), sal.symtab, sal.line);
542 annotate_frame_end ();
544 gdb_flush (gdb_stdout);
548 print_frame (struct frame_info *fi,
550 enum print_what print_what,
552 struct symtab_and_line sal)
556 enum language funlang = language_unknown;
557 struct ui_stream *stb;
558 struct cleanup *old_chain;
559 struct cleanup *list_chain;
561 stb = ui_out_stream_new (uiout);
562 old_chain = make_cleanup_ui_out_stream_delete (stb);
564 func = find_pc_function (get_frame_address_in_block (fi));
567 /* In certain pathological cases, the symtabs give the wrong
568 function (when we are in the first function in a file which
569 is compiled without debugging symbols, the previous function
570 is compiled with debugging symbols, and the "foo.o" symbol
571 that is supposed to tell us where the file with debugging symbols
572 ends has been truncated by ar because it is longer than 15
573 characters). This also occurs if the user uses asm() to create
574 a function but not stabs for it (in a file compiled -g).
576 So look in the minimal symbol tables as well, and if it comes
577 up with a larger address for the function use that instead.
578 I don't think this can ever cause any problems; there shouldn't
579 be any minimal symbols in the middle of a function; if this is
580 ever changed many parts of GDB will need to be changed (and we'll
581 create a find_pc_minimal_function or some such). */
583 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
585 && (SYMBOL_VALUE_ADDRESS (msymbol)
586 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
588 /* We also don't know anything about the function besides
589 its address and name. */
591 funname = DEPRECATED_SYMBOL_NAME (msymbol);
592 funlang = SYMBOL_LANGUAGE (msymbol);
596 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
597 demangled name that we already have stored in the symbol
598 table, but we stored a version with DMGL_PARAMS turned
599 on, and here we don't want to display parameters. So call
600 the demangler again, with DMGL_ANSI only. (Yes, I know
601 that printf_symbol_filtered() will again try to demangle
602 the name on the fly, but the issue is that if
603 cplus_demangle() fails here, it'll fail there too. So we
604 want to catch the failure ("demangled==NULL" case below)
605 here, while we still have our hands on the function
608 funname = DEPRECATED_SYMBOL_NAME (func);
609 funlang = SYMBOL_LANGUAGE (func);
610 if (funlang == language_cplus)
612 demangled = cplus_demangle (funname, DMGL_ANSI);
613 if (demangled == NULL)
614 /* If the demangler fails, try the demangled name from
615 the symbol table. This'll have parameters, but
616 that's preferable to diplaying a mangled name. */
617 funname = SYMBOL_PRINT_NAME (func);
623 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
626 funname = DEPRECATED_SYMBOL_NAME (msymbol);
627 funlang = SYMBOL_LANGUAGE (msymbol);
631 annotate_frame_begin (print_level ? frame_relative_level (fi) : 0,
634 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
638 ui_out_text (uiout, "#");
639 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
640 frame_relative_level (fi));
643 if (get_frame_pc (fi) != sal.pc
645 || print_what == LOC_AND_ADDRESS)
647 annotate_frame_address ();
648 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
649 annotate_frame_address_end ();
650 ui_out_text (uiout, " in ");
652 annotate_frame_function_name ();
653 fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang,
655 ui_out_field_stream (uiout, "func", stb);
656 ui_out_wrap_hint (uiout, " ");
657 annotate_frame_args ();
659 ui_out_text (uiout, " (");
662 struct print_args_args args;
663 struct cleanup *args_list_chain;
666 args.stream = gdb_stdout;
667 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
668 catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL);
669 /* FIXME: args must be a list. If one argument is a string it will
670 have " that will not be properly escaped. */
671 /* Invoke ui_out_tuple_end. */
672 do_cleanups (args_list_chain);
675 ui_out_text (uiout, ")");
676 if (sal.symtab && sal.symtab->filename)
678 annotate_frame_source_begin ();
679 ui_out_wrap_hint (uiout, " ");
680 ui_out_text (uiout, " at ");
681 annotate_frame_source_file ();
682 ui_out_field_string (uiout, "file", sal.symtab->filename);
683 if (ui_out_is_mi_like_p (uiout))
685 const char *fullname = symtab_to_fullname (sal.symtab);
686 if (fullname != NULL)
687 ui_out_field_string (uiout, "fullname", fullname);
689 annotate_frame_source_file_end ();
690 ui_out_text (uiout, ":");
691 annotate_frame_source_line ();
692 ui_out_field_int (uiout, "line", sal.line);
693 annotate_frame_source_end ();
696 if (!funname || (!sal.symtab || !sal.symtab->filename))
699 char *lib = PC_SOLIB (get_frame_pc (fi));
701 char *lib = solib_address (get_frame_pc (fi));
705 annotate_frame_where ();
706 ui_out_wrap_hint (uiout, " ");
707 ui_out_text (uiout, " from ");
708 ui_out_field_string (uiout, "from", lib);
712 /* do_cleanups will call ui_out_tuple_end() for us. */
713 do_cleanups (list_chain);
714 ui_out_text (uiout, "\n");
715 do_cleanups (old_chain);
718 /* Show the frame info. If this is the tui, it will be shown in
719 the source display otherwise, nothing is done */
721 show_stack_frame (struct frame_info *fi)
726 /* Read a frame specification in whatever the appropriate format is.
727 Call error() if the specification is in any way invalid (i.e. this
728 function never returns NULL). When SEPECTED_P is non-NULL set it's
729 target to indicate that the default selected frame was used. */
731 static struct frame_info *
732 parse_frame_specification_1 (const char *frame_exp, const char *message,
733 int *selected_frame_p)
736 struct value *args[4];
737 CORE_ADDR addrs[ARRAY_SIZE (args)];
739 if (frame_exp == NULL)
744 struct cleanup *tmp_cleanup;
750 struct cleanup *cleanup;
753 /* Skip leading white space, bail of EOL. */
754 while (isspace (*frame_exp))
759 /* Parse the argument, extract it, save it. */
763 addr_string = savestring (frame_exp, p - frame_exp);
765 cleanup = make_cleanup (xfree, addr_string);
767 /* NOTE: Parse and evaluate expression, but do not use
768 functions such as parse_and_eval_long or
769 parse_and_eval_address to also extract the value.
770 Instead value_as_long and value_as_address are used.
771 This avoids problems with expressions that contain
773 if (numargs >= ARRAY_SIZE (args))
774 error (_("Too many args in frame specification"));
775 args[numargs++] = parse_and_eval (addr_string);
777 do_cleanups (cleanup);
781 /* If no args, default to the selected frame. */
784 if (selected_frame_p != NULL)
785 (*selected_frame_p) = 1;
786 return get_selected_frame (message);
789 /* None of the remaining use the selected frame. */
790 if (selected_frame_p != NULL)
791 (*selected_frame_p) = 0;
793 /* Assume the single arg[0] is an integer, and try using that to
794 select a frame relative to current. */
797 struct frame_info *fid;
798 int level = value_as_long (args[0]);
799 fid = find_relative_frame (get_current_frame (), &level);
801 /* find_relative_frame was successful */
805 /* Convert each value into a corresponding address. */
808 for (i = 0; i < numargs; i++)
809 addrs[i] = value_as_address (args[0]);
812 /* Assume that the single arg[0] is an address, use that to identify
813 a frame with a matching ID. Should this also accept stack/pc or
817 struct frame_id id = frame_id_build_wild (addrs[0]);
818 struct frame_info *fid;
820 /* If (s)he specifies the frame with an address, he deserves
821 what (s)he gets. Still, give the highest one that matches.
822 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
824 for (fid = get_current_frame ();
826 fid = get_prev_frame (fid))
828 if (frame_id_eq (id, get_frame_id (fid)))
830 while (frame_id_eq (id, frame_unwind_id (fid)))
831 fid = get_prev_frame (fid);
837 /* We couldn't identify the frame as an existing frame, but
838 perhaps we can create one with a single argument. */
840 return create_new_frame (addrs[0], 0);
841 else if (numargs == 2)
842 return create_new_frame (addrs[0], addrs[1]);
844 error (_("Too many args in frame specification"));
848 parse_frame_specification (char *frame_exp)
850 return parse_frame_specification_1 (frame_exp, NULL, NULL);
853 /* Print verbosely the selected frame or the frame at address ADDR.
854 This means absolutely all information in the frame is printed. */
857 frame_info (char *addr_exp, int from_tty)
859 struct frame_info *fi;
860 struct symtab_and_line sal;
863 struct frame_info *calling_frame_info;
864 int i, count, numregs;
866 enum language funlang = language_unknown;
867 const char *pc_regname;
868 int selected_frame_p;
870 fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
872 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
873 is not a good name. */
875 /* OK, this is weird. The PC_REGNUM hardware register's value can
876 easily not match that of the internal value returned by
878 pc_regname = REGISTER_NAME (PC_REGNUM);
880 /* But then, this is weird to. Even without PC_REGNUM, an
881 architectures will often have a hardware register called "pc",
882 and that register's value, again, can easily not match
886 find_frame_sal (fi, &sal);
887 func = get_frame_function (fi);
888 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
890 s = find_pc_symtab (get_frame_pc (fi));
893 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
894 * the demangled name that we already have stored in
895 * the symbol table, but we stored a version with
896 * DMGL_PARAMS turned on, and here we don't want
897 * to display parameters. So call the demangler again,
898 * with DMGL_ANSI only. RT
899 * (Yes, I know that printf_symbol_filtered() will
900 * again try to demangle the name on the fly, but
901 * the issue is that if cplus_demangle() fails here,
902 * it'll fail there too. So we want to catch the failure
903 * ("demangled==NULL" case below) here, while we still
904 * have our hands on the function symbol.)
907 funname = DEPRECATED_SYMBOL_NAME (func);
908 funlang = SYMBOL_LANGUAGE (func);
909 if (funlang == language_cplus)
911 demangled = cplus_demangle (funname, DMGL_ANSI);
912 /* If the demangler fails, try the demangled name
913 * from the symbol table. This'll have parameters,
914 * but that's preferable to diplaying a mangled name.
916 if (demangled == NULL)
917 funname = SYMBOL_PRINT_NAME (func);
922 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
925 funname = DEPRECATED_SYMBOL_NAME (msymbol);
926 funlang = SYMBOL_LANGUAGE (msymbol);
929 calling_frame_info = get_prev_frame (fi);
931 if (selected_frame_p && frame_relative_level (fi) >= 0)
933 printf_filtered (_("Stack level %d, frame at "),
934 frame_relative_level (fi));
935 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
936 printf_filtered (":\n");
940 printf_filtered (_("Stack frame at "));
941 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
942 printf_filtered (":\n");
944 printf_filtered (" %s = ", pc_regname);
945 deprecated_print_address_numeric (get_frame_pc (fi), 1, gdb_stdout);
950 printf_filtered (" in ");
951 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
952 DMGL_ANSI | DMGL_PARAMS);
956 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
957 puts_filtered ("; ");
959 printf_filtered ("saved %s ", pc_regname);
960 deprecated_print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout);
961 printf_filtered ("\n");
963 if (calling_frame_info)
965 printf_filtered (" called by frame at ");
966 deprecated_print_address_numeric (get_frame_base (calling_frame_info),
969 if (get_next_frame (fi) && calling_frame_info)
972 if (get_next_frame (fi))
974 printf_filtered (" caller of frame at ");
975 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi)), 1,
978 if (get_next_frame (fi) || calling_frame_info)
979 puts_filtered ("\n");
981 printf_filtered (" source language %s.\n",
982 language_str (s->language));
985 /* Address of the argument list for this frame, or 0. */
986 CORE_ADDR arg_list = get_frame_args_address (fi);
987 /* Number of args for this frame, or -1 if unknown. */
991 printf_filtered (" Arglist at unknown address.\n");
994 printf_filtered (" Arglist at ");
995 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
996 printf_filtered (",");
998 if (!FRAME_NUM_ARGS_P ())
1001 puts_filtered (" args: ");
1005 numargs = FRAME_NUM_ARGS (fi);
1006 gdb_assert (numargs >= 0);
1008 puts_filtered (" no args.");
1009 else if (numargs == 1)
1010 puts_filtered (" 1 arg: ");
1012 printf_filtered (" %d args: ", numargs);
1014 print_frame_args (func, fi, numargs, gdb_stdout);
1015 puts_filtered ("\n");
1019 /* Address of the local variables for this frame, or 0. */
1020 CORE_ADDR arg_list = get_frame_locals_address (fi);
1023 printf_filtered (" Locals at unknown address,");
1026 printf_filtered (" Locals at ");
1027 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
1028 printf_filtered (",");
1032 /* Print as much information as possible on the location of all the
1035 enum lval_type lval;
1043 /* The sp is special; what's displayed isn't the save address, but
1044 the value of the previous frame's sp. This is a legacy thing,
1045 at one stage the frame cached the previous frame's SP instead
1046 of its address, hence it was easiest to just display the cached
1050 /* Find out the location of the saved stack pointer with out
1051 actually evaluating it. */
1052 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1054 if (!optimized && lval == not_lval)
1056 gdb_byte value[MAX_REGISTER_SIZE];
1058 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1060 /* NOTE: cagney/2003-05-22: This is assuming that the
1061 stack pointer was packed as an unsigned integer. That
1062 may or may not be valid. */
1063 sp = extract_unsigned_integer (value, register_size (current_gdbarch, SP_REGNUM));
1064 printf_filtered (" Previous frame's sp is ");
1065 deprecated_print_address_numeric (sp, 1, gdb_stdout);
1066 printf_filtered ("\n");
1069 else if (!optimized && lval == lval_memory)
1071 printf_filtered (" Previous frame's sp at ");
1072 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1073 printf_filtered ("\n");
1076 else if (!optimized && lval == lval_register)
1078 printf_filtered (" Previous frame's sp in %s\n",
1079 REGISTER_NAME (realnum));
1082 /* else keep quiet. */
1086 numregs = NUM_REGS + NUM_PSEUDO_REGS;
1087 for (i = 0; i < numregs; i++)
1089 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup))
1091 /* Find out the location of the saved register without
1092 fetching the corresponding value. */
1093 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1095 /* For moment, only display registers that were saved on the
1097 if (!optimized && lval == lval_memory)
1100 puts_filtered (" Saved registers:\n ");
1102 puts_filtered (",");
1104 printf_filtered (" %s at ", REGISTER_NAME (i));
1105 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1109 if (count || need_nl)
1110 puts_filtered ("\n");
1114 /* Print briefly all stack frames or just the innermost COUNT frames. */
1116 static void backtrace_command_1 (char *count_exp, int show_locals,
1119 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1121 struct frame_info *fi;
1124 struct frame_info *trailing;
1127 if (!target_has_stack)
1128 error (_("No stack."));
1130 /* The following code must do two things. First, it must
1131 set the variable TRAILING to the frame from which we should start
1132 printing. Second, it must set the variable count to the number
1133 of frames which we should print, or -1 if all of them. */
1134 trailing = get_current_frame ();
1136 /* The target can be in a state where there is no valid frames
1137 (e.g., just connected). */
1138 if (trailing == NULL)
1139 error (_("No stack."));
1144 count = parse_and_eval_long (count_exp);
1147 struct frame_info *current;
1152 while (current && count--)
1155 current = get_prev_frame (current);
1158 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1159 will be COUNT below it. */
1163 trailing = get_prev_frame (trailing);
1164 current = get_prev_frame (current);
1176 struct partial_symtab *ps;
1178 /* Read in symbols for all of the frames. Need to do this in
1179 a separate pass so that "Reading in symbols for xxx" messages
1180 don't screw up the appearance of the backtrace. Also
1181 if people have strong opinions against reading symbols for
1182 backtrace this may have to be an option. */
1186 fi = get_prev_frame (fi))
1189 ps = find_pc_psymtab (get_frame_address_in_block (fi));
1191 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */
1195 for (i = 0, fi = trailing;
1197 i++, fi = get_prev_frame (fi))
1201 /* Don't use print_stack_frame; if an error() occurs it probably
1202 means further attempts to backtrace would fail (on the other
1203 hand, perhaps the code does or could be fixed to make sure
1204 the frame->prev field gets set to NULL in that case). */
1205 print_frame_info (fi, 1, LOCATION, 1);
1207 print_frame_local_vars (fi, 1, gdb_stdout);
1210 /* If we've stopped before the end, mention that. */
1212 printf_filtered (_("(More stack frames follow...)\n"));
1215 struct backtrace_command_args
1222 /* Stub to call backtrace_command_1 by way of an error catcher. */
1224 backtrace_command_stub (void *data)
1226 struct backtrace_command_args *args = (struct backtrace_command_args *)data;
1227 backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty);
1232 backtrace_command (char *arg, int from_tty)
1234 struct cleanup *old_chain = (struct cleanup *) NULL;
1235 char **argv = (char **) NULL;
1236 int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0;
1238 struct backtrace_command_args btargs;
1240 if (arg != (char *) NULL)
1244 argv = buildargv (arg);
1245 old_chain = make_cleanup_freeargv (argv);
1247 for (i = 0; (argv[i] != (char *) NULL); i++)
1251 for (j = 0; (j < strlen (argv[i])); j++)
1252 argv[i][j] = tolower (argv[i][j]);
1254 if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full"))
1255 argIndicatingFullTrace = argc;
1259 totArgLen += strlen (argv[i]);
1263 if (argIndicatingFullTrace >= 0)
1267 argPtr = (char *) xmalloc (totArgLen + 1);
1272 memset (argPtr, 0, totArgLen + 1);
1273 for (i = 0; (i < (argc + 1)); i++)
1275 if (i != argIndicatingFullTrace)
1277 strcat (argPtr, argv[i]);
1278 strcat (argPtr, " ");
1284 argPtr = (char *) NULL;
1288 btargs.count_exp = argPtr;
1289 btargs.show_locals = (argIndicatingFullTrace >= 0);
1290 btargs.from_tty = from_tty;
1291 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR);
1293 if (argIndicatingFullTrace >= 0 && totArgLen > 0)
1297 do_cleanups (old_chain);
1300 static void backtrace_full_command (char *arg, int from_tty);
1302 backtrace_full_command (char *arg, int from_tty)
1304 struct backtrace_command_args btargs;
1305 btargs.count_exp = arg;
1306 btargs.show_locals = 1;
1307 btargs.from_tty = from_tty;
1308 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR);
1312 /* Print the local variables of a block B active in FRAME.
1313 Return 1 if any variables were printed; 0 otherwise. */
1316 print_block_frame_locals (struct block *b, struct frame_info *fi,
1317 int num_tabs, struct ui_file *stream)
1319 struct dict_iterator iter;
1322 int values_printed = 0;
1324 ALL_BLOCK_SYMBOLS (b, iter, sym)
1326 switch (SYMBOL_CLASS (sym))
1334 for (j = 0; j < num_tabs; j++)
1335 fputs_filtered ("\t", stream);
1336 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1337 fputs_filtered (" = ", stream);
1338 print_variable_value (sym, fi, stream);
1339 fprintf_filtered (stream, "\n");
1343 /* Ignore symbols which are not locals. */
1347 return values_printed;
1350 /* Same, but print labels. */
1353 print_block_frame_labels (struct block *b, int *have_default,
1354 struct ui_file *stream)
1356 struct dict_iterator iter;
1358 int values_printed = 0;
1360 ALL_BLOCK_SYMBOLS (b, iter, sym)
1362 if (strcmp (DEPRECATED_SYMBOL_NAME (sym), "default") == 0)
1368 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1370 struct symtab_and_line sal;
1371 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1373 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1376 fprintf_filtered (stream, " ");
1377 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
1379 fprintf_filtered (stream, " in file %s, line %d\n",
1380 sal.symtab->filename, sal.line);
1383 return values_printed;
1386 /* Print on STREAM all the local variables in frame FRAME,
1387 including all the blocks active in that frame
1390 Returns 1 if the job was done,
1391 or 0 if nothing was printed because we have no info
1392 on the function running in FRAME. */
1395 print_frame_local_vars (struct frame_info *fi, int num_tabs,
1396 struct ui_file *stream)
1398 struct block *block = get_frame_block (fi, 0);
1399 int values_printed = 0;
1403 fprintf_filtered (stream, "No symbol table info available.\n");
1409 if (print_block_frame_locals (block, fi, num_tabs, stream))
1411 /* After handling the function's top-level block, stop.
1412 Don't continue to its superblock, the block of
1413 per-file symbols. */
1414 if (BLOCK_FUNCTION (block))
1416 block = BLOCK_SUPERBLOCK (block);
1419 if (!values_printed)
1421 fprintf_filtered (stream, "No locals.\n");
1425 /* Same, but print labels. */
1428 print_frame_label_vars (struct frame_info *fi, int this_level_only,
1429 struct ui_file *stream)
1431 struct blockvector *bl;
1432 struct block *block = get_frame_block (fi, 0);
1433 int values_printed = 0;
1434 int index, have_default = 0;
1435 char *blocks_printed;
1436 CORE_ADDR pc = get_frame_pc (fi);
1440 fprintf_filtered (stream, "No symbol table info available.\n");
1444 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
1445 blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1446 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1450 CORE_ADDR end = BLOCK_END (block) - 4;
1453 if (bl != blockvector_for_pc (end, &index))
1454 error (_("blockvector blotch"));
1455 if (BLOCKVECTOR_BLOCK (bl, index) != block)
1456 error (_("blockvector botch"));
1457 last_index = BLOCKVECTOR_NBLOCKS (bl);
1460 /* Don't print out blocks that have gone by. */
1461 while (index < last_index
1462 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
1465 while (index < last_index
1466 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
1468 if (blocks_printed[index] == 0)
1470 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
1472 blocks_printed[index] = 1;
1478 if (values_printed && this_level_only)
1481 /* After handling the function's top-level block, stop.
1482 Don't continue to its superblock, the block of
1483 per-file symbols. */
1484 if (BLOCK_FUNCTION (block))
1486 block = BLOCK_SUPERBLOCK (block);
1489 if (!values_printed && !this_level_only)
1491 fprintf_filtered (stream, "No catches.\n");
1496 locals_info (char *args, int from_tty)
1498 print_frame_local_vars (get_selected_frame ("No frame selected."),
1503 catch_info (char *ignore, int from_tty)
1505 struct symtab_and_line *sal;
1507 /* Check for target support for exception handling */
1508 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
1511 /* Currently not handling this */
1512 /* Ideally, here we should interact with the C++ runtime
1513 system to find the list of active handlers, etc. */
1514 fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n");
1518 /* Assume g++ compiled code -- old v 4.16 behaviour */
1519 print_frame_label_vars (get_selected_frame ("No frame selected."),
1525 print_frame_arg_vars (struct frame_info *fi,
1526 struct ui_file *stream)
1528 struct symbol *func = get_frame_function (fi);
1530 struct dict_iterator iter;
1531 struct symbol *sym, *sym2;
1532 int values_printed = 0;
1536 fprintf_filtered (stream, "No symbol table info available.\n");
1540 b = SYMBOL_BLOCK_VALUE (func);
1541 ALL_BLOCK_SYMBOLS (b, iter, sym)
1543 switch (SYMBOL_CLASS (sym))
1549 case LOC_REGPARM_ADDR:
1550 case LOC_BASEREG_ARG:
1551 case LOC_COMPUTED_ARG:
1553 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1554 fputs_filtered (" = ", stream);
1556 /* We have to look up the symbol because arguments can have
1557 two entries (one a parameter, one a local) and the one we
1558 want is the local, which lookup_symbol will find for us.
1559 This includes gcc1 (not gcc2) on the sparc when passing a
1560 small structure and gcc2 when the argument type is float
1561 and it is passed as a double and converted to float by
1562 the prologue (in the latter case the type of the LOC_ARG
1563 symbol is double and the type of the LOC_LOCAL symbol is
1564 float). There are also LOC_ARG/LOC_REGISTER pairs which
1565 are not combined in symbol-reading. */
1567 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
1568 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
1569 print_variable_value (sym2, fi, stream);
1570 fprintf_filtered (stream, "\n");
1574 /* Don't worry about things which aren't arguments. */
1578 if (!values_printed)
1580 fprintf_filtered (stream, "No arguments.\n");
1585 args_info (char *ignore, int from_tty)
1587 print_frame_arg_vars (get_selected_frame ("No frame selected."),
1593 args_plus_locals_info (char *ignore, int from_tty)
1595 args_info (ignore, from_tty);
1596 locals_info (ignore, from_tty);
1600 /* Select frame FI. Also print the stack frame and show the source if
1601 this is the tui version. */
1603 select_and_print_frame (struct frame_info *fi)
1607 print_stack_frame (fi, 1, SRC_AND_LOC);
1610 /* Return the symbol-block in which the selected frame is executing.
1611 Can return zero under various legitimate circumstances.
1613 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1614 code address within the block returned. We use this to decide
1615 which macros are in scope. */
1618 get_selected_block (CORE_ADDR *addr_in_block)
1620 if (!target_has_stack)
1623 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1624 a selected/current frame? Perhaps this function is called,
1625 indirectly, by WFI in "infrun.c" where avoiding the creation of
1626 an inner most frame is very important (it slows down single
1627 step). I suspect, though that this was true in the deep dark
1628 past but is no longer the case. A mindless look at all the
1629 callers tends to support this theory. I think we should be able
1630 to assume that there is always a selcted frame. */
1631 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1633 if (!deprecated_selected_frame)
1635 CORE_ADDR pc = read_pc ();
1636 if (addr_in_block != NULL)
1637 *addr_in_block = pc;
1638 return block_for_pc (pc);
1640 return get_frame_block (deprecated_selected_frame, addr_in_block);
1643 /* Find a frame a certain number of levels away from FRAME.
1644 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1645 Positive means go to earlier frames (up); negative, the reverse.
1646 The int that contains the number of levels is counted toward
1647 zero as the frames for those levels are found.
1648 If the top or bottom frame is reached, that frame is returned,
1649 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1650 how much farther the original request asked to go. */
1653 find_relative_frame (struct frame_info *frame,
1654 int *level_offset_ptr)
1656 struct frame_info *prev;
1657 struct frame_info *frame1;
1659 /* Going up is simple: just do get_prev_frame enough times
1660 or until initial frame is reached. */
1661 while (*level_offset_ptr > 0)
1663 prev = get_prev_frame (frame);
1666 (*level_offset_ptr)--;
1669 /* Going down is just as simple. */
1670 if (*level_offset_ptr < 0)
1672 while (*level_offset_ptr < 0)
1674 frame1 = get_next_frame (frame);
1678 (*level_offset_ptr)++;
1684 /* The "select_frame" command. With no arg, NOP.
1685 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1686 valid level. Otherwise, treat level_exp as an address expression
1687 and select it. See parse_frame_specification for more info on proper
1688 frame expressions. */
1691 select_frame_command (char *level_exp, int from_tty)
1693 select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
1696 /* The "frame" command. With no arg, print selected frame briefly.
1697 With arg, behaves like select_frame and then prints the selected
1701 frame_command (char *level_exp, int from_tty)
1703 select_frame_command (level_exp, from_tty);
1704 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1707 /* The XDB Compatibility command to print the current frame. */
1710 current_frame_command (char *level_exp, int from_tty)
1712 print_stack_frame (get_selected_frame ("No stack."), 1, SRC_AND_LOC);
1715 /* Select the frame up one or COUNT stack levels
1716 from the previously selected frame, and print it briefly. */
1719 up_silently_base (char *count_exp)
1721 struct frame_info *fi;
1722 int count = 1, count1;
1724 count = parse_and_eval_long (count_exp);
1727 fi = find_relative_frame (get_selected_frame ("No stack."), &count1);
1728 if (count1 != 0 && count_exp == 0)
1729 error (_("Initial frame selected; you cannot go up."));
1734 up_silently_command (char *count_exp, int from_tty)
1736 up_silently_base (count_exp);
1740 up_command (char *count_exp, int from_tty)
1742 up_silently_base (count_exp);
1743 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1746 /* Select the frame down one or COUNT stack levels
1747 from the previously selected frame, and print it briefly. */
1750 down_silently_base (char *count_exp)
1752 struct frame_info *frame;
1753 int count = -1, count1;
1755 count = -parse_and_eval_long (count_exp);
1758 frame = find_relative_frame (get_selected_frame ("No stack."), &count1);
1759 if (count1 != 0 && count_exp == 0)
1762 /* We only do this if count_exp is not specified. That way "down"
1763 means to really go down (and let me know if that is
1764 impossible), but "down 9999" can be used to mean go all the way
1765 down without getting an error. */
1767 error (_("Bottom (i.e., innermost) frame selected; you cannot go down."));
1770 select_frame (frame);
1774 down_silently_command (char *count_exp, int from_tty)
1776 down_silently_base (count_exp);
1780 down_command (char *count_exp, int from_tty)
1782 down_silently_base (count_exp);
1783 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1787 return_command (char *retval_exp, int from_tty)
1789 struct symbol *thisfun;
1790 struct value *return_value = NULL;
1791 const char *query_prefix = "";
1793 thisfun = get_frame_function (get_selected_frame ("No selected frame."));
1795 /* Compute the return value. If the computation triggers an error,
1796 let it bail. If the return type can't be handled, set
1797 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1801 struct type *return_type = NULL;
1803 /* Compute the return value. Should the computation fail, this
1804 call throws an error. */
1805 return_value = parse_and_eval (retval_exp);
1807 /* Cast return value to the return type of the function. Should
1808 the cast fail, this call throws an error. */
1809 if (thisfun != NULL)
1810 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1811 if (return_type == NULL)
1812 return_type = builtin_type_int;
1813 CHECK_TYPEDEF (return_type);
1814 return_value = value_cast (return_type, return_value);
1816 /* Make sure the value is fully evaluated. It may live in the
1817 stack frame we're about to pop. */
1818 if (value_lazy (return_value))
1819 value_fetch_lazy (return_value);
1821 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1822 /* If the return-type is "void", don't try to find the
1823 return-value's location. However, do still evaluate the
1824 return expression so that, even when the expression result
1825 is discarded, side effects such as "return i++" still
1827 return_value = NULL;
1828 /* FIXME: cagney/2004-01-17: If the architecture implements both
1829 return_value and extract_returned_value_address, should allow
1830 "return" to work - don't set return_value to NULL. */
1831 else if (!gdbarch_return_value_p (current_gdbarch)
1832 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT
1833 || TYPE_CODE (return_type) == TYPE_CODE_UNION))
1835 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1836 code. Old architectures don't expect STORE_RETURN_VALUE
1837 to be called with with a small struct that needs to be
1838 stored in registers. Don't start doing it now. */
1840 A structure or union return type is not supported by this architecture.\n\
1841 If you continue, the return value that you specified will be ignored.\n";
1842 return_value = NULL;
1844 else if (using_struct_return (return_type, 0))
1847 The location at which to store the function's return value is unknown.\n\
1848 If you continue, the return value that you specified will be ignored.\n";
1849 return_value = NULL;
1853 /* Does an interactive user really want to do this? Include
1854 information, such as how well GDB can handle the return value, in
1855 the query message. */
1859 if (thisfun == NULL)
1860 confirmed = query (_("%sMake selected stack frame return now? "),
1863 confirmed = query (_("%sMake %s return now? "), query_prefix,
1864 SYMBOL_PRINT_NAME (thisfun));
1866 error (_("Not confirmed"));
1869 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1870 frame in turn, should this code just go straight to the relevant
1871 frame and pop that? */
1873 /* First discard all frames inner-to the selected frame (making the
1874 selected frame current). */
1876 struct frame_id selected_id = get_frame_id (get_selected_frame (NULL));
1877 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ())))
1879 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ())))
1880 /* Caught in the safety net, oops! We've gone way past the
1882 error (_("Problem while popping stack frames (corrupt stack?)"));
1883 frame_pop (get_current_frame ());
1887 /* Second discard the selected frame (which is now also the current
1889 frame_pop (get_current_frame ());
1891 /* Store RETURN_VAUE in the just-returned register set. */
1892 if (return_value != NULL)
1894 struct type *return_type = value_type (return_value);
1895 gdb_assert (gdbarch_return_value (current_gdbarch, return_type,
1897 == RETURN_VALUE_REGISTER_CONVENTION);
1898 gdbarch_return_value (current_gdbarch, return_type,
1899 current_regcache, NULL /*read*/,
1900 value_contents (return_value) /*write*/);
1903 /* If we are at the end of a call dummy now, pop the dummy frame
1905 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1906 frame_pop (get_current_frame ());
1908 /* If interactive, print the frame that is now current. */
1910 frame_command ("0", 1);
1912 select_frame_command ("0", 0);
1915 /* Sets the scope to input function name, provided that the
1916 function is within the current stack frame */
1918 struct function_bounds
1920 CORE_ADDR low, high;
1923 static void func_command (char *arg, int from_tty);
1925 func_command (char *arg, int from_tty)
1927 struct frame_info *fp;
1929 struct symtabs_and_lines sals;
1932 struct function_bounds *func_bounds = (struct function_bounds *) NULL;
1934 if (arg != (char *) NULL)
1937 fp = parse_frame_specification ("0");
1938 sals = decode_line_spec (arg, 1);
1939 func_bounds = (struct function_bounds *) xmalloc (
1940 sizeof (struct function_bounds) * sals.nelts);
1941 for (i = 0; (i < sals.nelts && !found); i++)
1943 if (sals.sals[i].pc == (CORE_ADDR) 0 ||
1944 find_pc_partial_function (sals.sals[i].pc,
1946 &func_bounds[i].low,
1947 &func_bounds[i].high) == 0)
1949 func_bounds[i].low =
1950 func_bounds[i].high = (CORE_ADDR) NULL;
1956 for (i = 0; (i < sals.nelts && !found); i++)
1957 found = (get_frame_pc (fp) >= func_bounds[i].low &&
1958 get_frame_pc (fp) < func_bounds[i].high);
1962 fp = find_relative_frame (fp, &level);
1965 while (!found && level == 0);
1968 xfree (func_bounds);
1971 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
1972 else if (fp != deprecated_selected_frame)
1973 select_and_print_frame (fp);
1976 /* Gets the language of the current frame. */
1979 get_frame_language (void)
1982 enum language flang; /* The language of the current frame */
1984 if (deprecated_selected_frame)
1986 /* We determine the current frame language by looking up its
1987 associated symtab. To retrieve this symtab, we use the frame PC.
1988 However we cannot use the frame pc as is, because it usually points
1989 to the instruction following the "call", which is sometimes the first
1990 instruction of another function. So we rely on
1991 get_frame_address_in_block(), it provides us with a PC which is
1992 guaranteed to be inside the frame's code block. */
1993 s = find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame));
1995 flang = s->language;
1997 flang = language_unknown;
2000 flang = language_unknown;
2006 _initialize_stack (void)
2009 backtrace_limit = 30;
2012 add_com ("return", class_stack, return_command, _("\
2013 Make selected stack frame return to its caller.\n\
2014 Control remains in the debugger, but when you continue\n\
2015 execution will resume in the frame above the one now selected.\n\
2016 If an argument is given, it is an expression for the value to return."));
2018 add_com ("up", class_stack, up_command, _("\
2019 Select and print stack frame that called this one.\n\
2020 An argument says how many frames up to go."));
2021 add_com ("up-silently", class_support, up_silently_command, _("\
2022 Same as the `up' command, but does not print anything.\n\
2023 This is useful in command scripts."));
2025 add_com ("down", class_stack, down_command, _("\
2026 Select and print stack frame called by this one.\n\
2027 An argument says how many frames down to go."));
2028 add_com_alias ("do", "down", class_stack, 1);
2029 add_com_alias ("dow", "down", class_stack, 1);
2030 add_com ("down-silently", class_support, down_silently_command, _("\
2031 Same as the `down' command, but does not print anything.\n\
2032 This is useful in command scripts."));
2034 add_com ("frame", class_stack, frame_command, _("\
2035 Select and print a stack frame.\n\
2036 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2037 An argument specifies the frame to select.\n\
2038 It can be a stack frame number or the address of the frame.\n\
2039 With argument, nothing is printed if input is coming from\n\
2040 a command file or a user-defined command."));
2042 add_com_alias ("f", "frame", class_stack, 1);
2046 add_com ("L", class_stack, current_frame_command,
2047 _("Print the current stack frame.\n"));
2048 add_com_alias ("V", "frame", class_stack, 1);
2050 add_com ("select-frame", class_stack, select_frame_command, _("\
2051 Select a stack frame without printing anything.\n\
2052 An argument specifies the frame to select.\n\
2053 It can be a stack frame number or the address of the frame.\n"));
2055 add_com ("backtrace", class_stack, backtrace_command, _("\
2056 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2057 With a negative argument, print outermost -COUNT frames.\n\
2058 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2059 add_com_alias ("bt", "backtrace", class_stack, 0);
2062 add_com_alias ("t", "backtrace", class_stack, 0);
2063 add_com ("T", class_stack, backtrace_full_command, _("\
2064 Print backtrace of all stack frames, or innermost COUNT frames \n\
2065 and the values of the local variables.\n\
2066 With a negative argument, print outermost -COUNT frames.\n\
2067 Usage: T <count>\n"));
2070 add_com_alias ("where", "backtrace", class_alias, 0);
2071 add_info ("stack", backtrace_command,
2072 _("Backtrace of the stack, or innermost COUNT frames."));
2073 add_info_alias ("s", "stack", 1);
2074 add_info ("frame", frame_info,
2075 _("All about selected stack frame, or frame at ADDR."));
2076 add_info_alias ("f", "frame", 1);
2077 add_info ("locals", locals_info,
2078 _("Local variables of current stack frame."));
2079 add_info ("args", args_info,
2080 _("Argument variables of current stack frame."));
2082 add_com ("l", class_info, args_plus_locals_info,
2083 _("Argument and local variables of current stack frame."));
2086 add_com ("func", class_stack, func_command, _("\
2087 Select the stack frame that contains <func>.\n\
2088 Usage: func <name>\n"));
2090 add_info ("catch", catch_info,
2091 _("Exceptions that can be caught in the current stack frame."));
2094 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, _(\
2095 "Specify maximum number of frames for \"backtrace\" to print by default."),
2097 add_info ("backtrace-limit", backtrace_limit_info, _("\
2098 The maximum number of frames for \"backtrace\" to print by default."));