1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
5 Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
30 #include "expression.h"
37 #include "breakpoint.h"
44 #include "gdb_assert.h"
45 #include "dictionary.h"
46 #include "reggroups.h"
49 /* Prototypes for exported functions. */
51 void args_info (char *, int);
53 void locals_info (char *, int);
55 void (*deprecated_selected_frame_level_changed_hook) (int);
57 void _initialize_stack (void);
59 /* Prototypes for local functions. */
61 static void down_command (char *, int);
63 static void down_silently_base (char *);
65 static void down_silently_command (char *, int);
67 static void up_command (char *, int);
69 static void up_silently_base (char *);
71 static void up_silently_command (char *, int);
73 void frame_command (char *, int);
75 static void current_frame_command (char *, int);
77 static void print_frame_arg_vars (struct frame_info *, struct ui_file *);
79 static void catch_info (char *, int);
81 static void args_plus_locals_info (char *, int);
83 static void print_frame_label_vars (struct frame_info *, int,
86 static void print_frame_local_vars (struct frame_info *, int,
89 static int print_block_frame_labels (struct block *, int *,
92 static int print_block_frame_locals (struct block *,
97 static void print_frame (struct frame_info *fi,
99 enum print_what print_what,
101 struct symtab_and_line sal);
103 static void backtrace_command (char *, int);
105 struct frame_info *parse_frame_specification (char *);
107 static void frame_info (char *, int);
109 extern int addressprint; /* Print addresses, or stay symbolic only? */
111 /* Zero means do things normally; we are interacting directly with the
112 user. One means print the full filename and linenumber when a
113 frame is printed, and do so in a format emacs18/emacs19.22 can
114 parse. Two means print similar annotations, but in many more
115 cases and in a slightly different syntax. */
117 int annotation_level = 0;
120 struct print_stack_frame_args
122 struct frame_info *fi;
124 enum print_what print_what;
128 /* Show or print the frame arguments.
129 Pass the args the way catch_errors wants them. */
131 print_stack_frame_stub (void *args)
133 struct print_stack_frame_args *p = (struct print_stack_frame_args *) args;
135 print_frame_info (p->fi, p->print_level, p->print_what, p->print_args);
139 /* Show or print a stack frame FI briefly. The output is format
140 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
141 relative level, function name, argument list, and file name and
142 line number. If the frame's PC is not at the beginning of the
143 source line, the actual PC is printed at the beginning. */
146 print_stack_frame (struct frame_info *fi, int print_level,
147 enum print_what print_what)
149 struct print_stack_frame_args args;
152 args.print_level = print_level;
153 args.print_what = print_what;
156 catch_errors (print_stack_frame_stub, (char *) &args, "", RETURN_MASK_ALL);
159 struct print_args_args
162 struct frame_info *fi;
163 struct ui_file *stream;
166 static int print_args_stub (void *);
168 /* Print nameless args on STREAM.
169 FI is the frameinfo for this frame, START is the offset
170 of the first nameless arg, and NUM is the number of nameless args to
171 print. FIRST is nonzero if this is the first argument (not just
172 the first nameless arg). */
175 print_frame_nameless_args (struct frame_info *fi, long start, int num,
176 int first, struct ui_file *stream)
182 for (i = 0; i < num; i++)
185 argsaddr = get_frame_args_address (fi);
188 arg_value = read_memory_integer (argsaddr + start, sizeof (int));
190 fprintf_filtered (stream, ", ");
191 fprintf_filtered (stream, "%ld", arg_value);
193 start += sizeof (int);
197 /* Print the arguments of a stack frame, given the function FUNC
198 running in that frame (as a symbol), the info on the frame,
199 and the number of args according to the stack frame (or -1 if unknown). */
201 /* References here and elsewhere to "number of args according to the
202 stack frame" appear in all cases to refer to "number of ints of args
203 according to the stack frame". At least for VAX, i386, isi. */
206 print_frame_args (struct symbol *func, struct frame_info *fi, int num,
207 struct ui_file *stream)
209 struct block *b = NULL;
211 struct dict_iterator iter;
214 /* Offset of next stack argument beyond the one we have seen that is
215 at the highest offset.
216 -1 if we haven't come to a stack argument yet. */
217 long highest_offset = -1;
219 /* Number of ints of arguments that we have printed so far. */
220 int args_printed = 0;
221 struct cleanup *old_chain, *list_chain;
222 struct ui_stream *stb;
224 stb = ui_out_stream_new (uiout);
225 old_chain = make_cleanup_ui_out_stream_delete (stb);
229 b = SYMBOL_BLOCK_VALUE (func);
231 ALL_BLOCK_SYMBOLS (b, iter, sym)
235 /* Keep track of the highest stack argument offset seen, and
236 skip over any kinds of symbols we don't care about. */
238 switch (SYMBOL_CLASS (sym))
243 long current_offset = SYMBOL_VALUE (sym);
244 arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
246 /* Compute address of next argument by adding the size of
247 this argument and rounding to an int boundary. */
249 ((current_offset + arg_size + sizeof (int) - 1)
250 & ~(sizeof (int) - 1));
252 /* If this is the highest offset seen yet, set highest_offset. */
253 if (highest_offset == -1
254 || (current_offset > highest_offset))
255 highest_offset = current_offset;
257 /* Add the number of ints we're about to print to args_printed. */
258 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
261 /* We care about types of symbols, but don't need to keep track of
262 stack offsets in them. */
264 case LOC_REGPARM_ADDR:
266 case LOC_BASEREG_ARG:
267 case LOC_COMPUTED_ARG:
270 /* Other types of symbols we just skip over. */
275 /* We have to look up the symbol because arguments can have
276 two entries (one a parameter, one a local) and the one we
277 want is the local, which lookup_symbol will find for us.
278 This includes gcc1 (not gcc2) on the sparc when passing a
279 small structure and gcc2 when the argument type is float
280 and it is passed as a double and converted to float by
281 the prologue (in the latter case the type of the LOC_ARG
282 symbol is double and the type of the LOC_LOCAL symbol is
284 /* But if the parameter name is null, don't try it.
285 Null parameter names occur on the RS/6000, for traceback tables.
286 FIXME, should we even print them? */
288 if (*DEPRECATED_SYMBOL_NAME (sym))
292 (DEPRECATED_SYMBOL_NAME (sym),
293 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
294 if (SYMBOL_CLASS (nsym) == LOC_REGISTER)
296 /* There is a LOC_ARG/LOC_REGISTER pair. This means that
297 it was passed on the stack and loaded into a register,
298 or passed in a register and stored in a stack slot.
299 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER.
301 Reasons for using the LOC_ARG:
302 (1) because find_saved_registers may be slow for remote
304 (2) because registers are often re-used and stack slots
305 rarely (never?) are. Therefore using the stack slot is
306 much less likely to print garbage.
308 Reasons why we might want to use the LOC_REGISTER:
309 (1) So that the backtrace prints the same value as
310 "print foo". I see no compelling reason why this needs
311 to be the case; having the backtrace print the value which
312 was passed in, and "print foo" print the value as modified
313 within the called function, makes perfect sense to me.
315 Additional note: It might be nice if "info args" displayed
317 One more note: There is a case with sparc structure passing
318 where we need to use the LOC_REGISTER, but this is dealt with
319 by creating a single LOC_REGPARM in symbol reading. */
321 /* Leave sym (the LOC_ARG) alone. */
328 /* Print the current arg. */
330 ui_out_text (uiout, ", ");
331 ui_out_wrap_hint (uiout, " ");
333 annotate_arg_begin ();
335 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
336 fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym),
337 SYMBOL_LANGUAGE (sym), DMGL_PARAMS | DMGL_ANSI);
338 ui_out_field_stream (uiout, "name", stb);
339 annotate_arg_name_end ();
340 ui_out_text (uiout, "=");
342 /* Avoid value_print because it will deref ref parameters. We just
343 want to print their addresses. Print ??? for args whose address
344 we do not know. We pass 2 as "recurse" to val_print because our
345 standard indentation here is 4 spaces, and val_print indents
346 2 for each recurse. */
347 val = read_var_value (sym, fi);
349 annotate_arg_value (val == NULL ? NULL : VALUE_TYPE (val));
353 val_print (VALUE_TYPE (val), VALUE_CONTENTS (val), 0,
355 stb->stream, 0, 0, 2, Val_no_prettyprint);
356 ui_out_field_stream (uiout, "value", stb);
359 ui_out_text (uiout, "???");
361 /* Invoke ui_out_tuple_end. */
362 do_cleanups (list_chain);
370 /* Don't print nameless args in situations where we don't know
371 enough about the stack to find them. */
376 if (highest_offset == -1)
377 start = FRAME_ARGS_SKIP;
379 start = highest_offset;
381 print_frame_nameless_args (fi, start, num - args_printed,
384 do_cleanups (old_chain);
387 /* Pass the args the way catch_errors wants them. */
390 print_args_stub (void *args)
393 struct print_args_args *p = (struct print_args_args *) args;
395 if (FRAME_NUM_ARGS_P ())
397 numargs = FRAME_NUM_ARGS (p->fi);
398 gdb_assert (numargs >= 0);
402 print_frame_args (p->func, p->fi, numargs, p->stream);
406 /* Print information about a frame for frame "fi" at level "level".
407 Used in "where" output, also used to emit breakpoint or step
409 LEVEL is the level of the frame, or -1 if it is the
410 innermost frame but we don't want to print the level.
411 The meaning of the SOURCE argument is:
412 SRC_LINE: Print only source line
413 LOCATION: Print only location
414 LOC_AND_SRC: Print location and source line. */
417 print_frame_info (struct frame_info *fi, int print_level,
418 enum print_what print_what, int print_args)
420 struct symtab_and_line sal;
424 if (get_frame_type (fi) == DUMMY_FRAME
425 || get_frame_type (fi) == SIGTRAMP_FRAME)
427 struct cleanup *uiout_cleanup
428 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
430 annotate_frame_begin (print_level ? frame_relative_level (fi) : 0,
433 /* Do this regardless of SOURCE because we don't have any source
434 to list for this frame. */
437 ui_out_text (uiout, "#");
438 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
439 frame_relative_level (fi));
441 if (ui_out_is_mi_like_p (uiout))
443 annotate_frame_address ();
444 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
445 annotate_frame_address_end ();
448 if (get_frame_type (fi) == DUMMY_FRAME)
450 annotate_function_call ();
451 ui_out_field_string (uiout, "func", "<function called from gdb>");
453 else if (get_frame_type (fi) == SIGTRAMP_FRAME)
455 annotate_signal_handler_caller ();
456 ui_out_field_string (uiout, "func", "<signal handler called>");
458 ui_out_text (uiout, "\n");
459 annotate_frame_end ();
461 do_cleanups (uiout_cleanup);
465 /* If fi is not the innermost frame, that normally means that fi->pc
466 points to *after* the call instruction, and we want to get the
467 line containing the call, never the next line. But if the next
468 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
469 was not entered as the result of a call, and we want to get the
470 line containing fi->pc. */
471 find_frame_sal (fi, &sal);
473 location_print = (print_what == LOCATION
474 || print_what == LOC_AND_ADDRESS
475 || print_what == SRC_AND_LOC);
477 if (location_print || !sal.symtab)
478 print_frame (fi, print_level, print_what, print_args, sal);
480 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
483 set_current_source_symtab_and_line (&sal);
485 if (source_print && sal.symtab)
487 struct symtab_and_line cursal;
489 int mid_statement = ((print_what == SRC_LINE)
490 && (get_frame_pc (fi) != sal.pc));
492 if (annotation_level)
493 done = identify_source_line (sal.symtab, sal.line, mid_statement,
497 if (deprecated_print_frame_info_listing_hook)
498 deprecated_print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0);
501 /* We used to do this earlier, but that is clearly
502 wrong. This function is used by many different
503 parts of gdb, including normal_stop in infrun.c,
504 which uses this to print out the current PC
505 when we stepi/nexti into the middle of a source
506 line. Only the command line really wants this
507 behavior. Other UIs probably would like the
508 ability to decide for themselves if it is desired. */
509 if (addressprint && mid_statement)
511 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
512 ui_out_text (uiout, "\t");
515 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
518 /* Make sure we have at least a default source file */
519 set_default_source_symtab_and_line ();
520 cursal = get_current_source_symtab_and_line ();
521 cursal.line = max (sal.line - get_lines_to_list () / 2, 1);
522 set_current_source_symtab_and_line (&cursal);
525 if (print_what != LOCATION)
526 set_default_breakpoint (1, get_frame_pc (fi), sal.symtab, sal.line);
528 annotate_frame_end ();
530 gdb_flush (gdb_stdout);
534 print_frame (struct frame_info *fi,
536 enum print_what print_what,
538 struct symtab_and_line sal)
542 enum language funlang = language_unknown;
543 struct ui_stream *stb;
544 struct cleanup *old_chain;
545 struct cleanup *list_chain;
547 stb = ui_out_stream_new (uiout);
548 old_chain = make_cleanup_ui_out_stream_delete (stb);
550 func = find_pc_function (get_frame_address_in_block (fi));
553 /* In certain pathological cases, the symtabs give the wrong
554 function (when we are in the first function in a file which
555 is compiled without debugging symbols, the previous function
556 is compiled with debugging symbols, and the "foo.o" symbol
557 that is supposed to tell us where the file with debugging symbols
558 ends has been truncated by ar because it is longer than 15
559 characters). This also occurs if the user uses asm() to create
560 a function but not stabs for it (in a file compiled -g).
562 So look in the minimal symbol tables as well, and if it comes
563 up with a larger address for the function use that instead.
564 I don't think this can ever cause any problems; there shouldn't
565 be any minimal symbols in the middle of a function; if this is
566 ever changed many parts of GDB will need to be changed (and we'll
567 create a find_pc_minimal_function or some such). */
569 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
571 && (SYMBOL_VALUE_ADDRESS (msymbol)
572 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
574 /* We also don't know anything about the function besides
575 its address and name. */
577 funname = DEPRECATED_SYMBOL_NAME (msymbol);
578 funlang = SYMBOL_LANGUAGE (msymbol);
582 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
583 demangled name that we already have stored in the symbol
584 table, but we stored a version with DMGL_PARAMS turned
585 on, and here we don't want to display parameters. So call
586 the demangler again, with DMGL_ANSI only. (Yes, I know
587 that printf_symbol_filtered() will again try to demangle
588 the name on the fly, but the issue is that if
589 cplus_demangle() fails here, it'll fail there too. So we
590 want to catch the failure ("demangled==NULL" case below)
591 here, while we still have our hands on the function
594 funname = DEPRECATED_SYMBOL_NAME (func);
595 funlang = SYMBOL_LANGUAGE (func);
596 if (funlang == language_cplus)
598 demangled = cplus_demangle (funname, DMGL_ANSI);
599 if (demangled == NULL)
600 /* If the demangler fails, try the demangled name from
601 the symbol table. This'll have parameters, but
602 that's preferable to diplaying a mangled name. */
603 funname = SYMBOL_PRINT_NAME (func);
609 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
612 funname = DEPRECATED_SYMBOL_NAME (msymbol);
613 funlang = SYMBOL_LANGUAGE (msymbol);
617 annotate_frame_begin (print_level ? frame_relative_level (fi) : 0,
620 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
624 ui_out_text (uiout, "#");
625 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
626 frame_relative_level (fi));
629 if (get_frame_pc (fi) != sal.pc
631 || print_what == LOC_AND_ADDRESS)
633 annotate_frame_address ();
634 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
635 annotate_frame_address_end ();
636 ui_out_text (uiout, " in ");
638 annotate_frame_function_name ();
639 fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang,
641 ui_out_field_stream (uiout, "func", stb);
642 ui_out_wrap_hint (uiout, " ");
643 annotate_frame_args ();
645 ui_out_text (uiout, " (");
648 struct print_args_args args;
649 struct cleanup *args_list_chain;
652 args.stream = gdb_stdout;
653 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
654 catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL);
655 /* FIXME: args must be a list. If one argument is a string it will
656 have " that will not be properly escaped. */
657 /* Invoke ui_out_tuple_end. */
658 do_cleanups (args_list_chain);
661 ui_out_text (uiout, ")");
662 if (sal.symtab && sal.symtab->filename)
664 annotate_frame_source_begin ();
665 ui_out_wrap_hint (uiout, " ");
666 ui_out_text (uiout, " at ");
667 annotate_frame_source_file ();
668 ui_out_field_string (uiout, "file", sal.symtab->filename);
669 annotate_frame_source_file_end ();
670 ui_out_text (uiout, ":");
671 annotate_frame_source_line ();
672 ui_out_field_int (uiout, "line", sal.line);
673 annotate_frame_source_end ();
677 if (!funname || (!sal.symtab || !sal.symtab->filename))
679 char *lib = PC_SOLIB (get_frame_pc (fi));
682 annotate_frame_where ();
683 ui_out_wrap_hint (uiout, " ");
684 ui_out_text (uiout, " from ");
685 ui_out_field_string (uiout, "from", lib);
688 #endif /* PC_SOLIB */
690 /* do_cleanups will call ui_out_tuple_end() for us. */
691 do_cleanups (list_chain);
692 ui_out_text (uiout, "\n");
693 do_cleanups (old_chain);
696 /* Show the frame info. If this is the tui, it will be shown in
697 the source display otherwise, nothing is done */
699 show_stack_frame (struct frame_info *fi)
704 /* Read a frame specification in whatever the appropriate format is.
705 Call error() if the specification is in any way invalid (i.e.
706 this function never returns NULL). */
709 parse_frame_specification (char *frame_exp)
713 CORE_ADDR args[MAXARGS];
718 char *addr_string, *p;
719 struct cleanup *tmp_cleanup;
721 while (*frame_exp == ' ')
726 if (numargs > MAXARGS)
727 error ("Too many args in frame specification");
728 /* Parse an argument. */
729 for (p = frame_exp; *p && *p != ' '; p++)
731 addr_string = savestring (frame_exp, p - frame_exp);
736 tmp_cleanup = make_cleanup (xfree, addr_string);
738 /* NOTE: we call parse_and_eval and then both
739 value_as_long and value_as_address rather than calling
740 parse_and_eval_long and parse_and_eval_address because
741 of the issue of potential side effects from evaluating
743 vp = parse_and_eval (addr_string);
745 level = value_as_long (vp);
747 args[numargs++] = value_as_address (vp);
748 do_cleanups (tmp_cleanup);
751 /* Skip spaces, move to possible next arg. */
761 if (deprecated_selected_frame == NULL)
762 error ("No selected frame.");
763 return deprecated_selected_frame;
767 struct frame_info *fid =
768 find_relative_frame (get_current_frame (), &level);
769 struct frame_info *tfid;
772 /* find_relative_frame was successful */
775 /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications
776 take at least 2 addresses. It is important to detect this case
777 here so that "frame 100" does not give a confusing error message
778 like "frame specification requires two addresses". This of course
779 does not solve the "frame 100" problem for machines on which
780 a frame specification can be made with one address. To solve
781 that, we need a new syntax for a specifying a frame by address.
782 I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for
783 two args, etc.), but people might think that is too much typing,
784 so I guess *0x23,0x45 would be a possible alternative (commas
785 really should be used instead of spaces to delimit; using spaces
786 normally works in an expression). */
787 #ifdef SETUP_ARBITRARY_FRAME
788 error ("No frame %s", paddr_d (args[0]));
791 /* If (s)he specifies the frame with an address, he deserves what
792 (s)he gets. Still, give the highest one that matches. */
794 for (fid = get_current_frame ();
795 fid && get_frame_base (fid) != args[0];
796 fid = get_prev_frame (fid))
800 while ((tfid = get_prev_frame (fid)) &&
801 (get_frame_base (tfid) == args[0]))
804 /* We couldn't identify the frame as an existing frame, but
805 perhaps we can create one with a single argument. */
809 #ifdef SETUP_ARBITRARY_FRAME
810 return SETUP_ARBITRARY_FRAME (numargs, args);
812 /* Usual case. Do it here rather than have everyone supply
813 a SETUP_ARBITRARY_FRAME that does this. */
815 return create_new_frame (args[0], 0);
816 error ("Too many args in frame specification");
823 /* Print verbosely the selected frame or the frame at address ADDR.
824 This means absolutely all information in the frame is printed. */
827 frame_info (char *addr_exp, int from_tty)
829 struct frame_info *fi;
830 struct symtab_and_line sal;
833 struct frame_info *calling_frame_info;
834 int i, count, numregs;
836 enum language funlang = language_unknown;
837 const char *pc_regname;
839 if (!target_has_stack)
842 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
843 is not a good name. */
845 /* OK, this is weird. The PC_REGNUM hardware register's value can
846 easily not match that of the internal value returned by
848 pc_regname = REGISTER_NAME (PC_REGNUM);
850 /* But then, this is weird to. Even without PC_REGNUM, an
851 architectures will often have a hardware register called "pc",
852 and that register's value, again, can easily not match
856 fi = parse_frame_specification (addr_exp);
858 error ("Invalid frame specified.");
860 find_frame_sal (fi, &sal);
861 func = get_frame_function (fi);
862 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
864 s = find_pc_symtab (get_frame_pc (fi));
867 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
868 * the demangled name that we already have stored in
869 * the symbol table, but we stored a version with
870 * DMGL_PARAMS turned on, and here we don't want
871 * to display parameters. So call the demangler again,
872 * with DMGL_ANSI only. RT
873 * (Yes, I know that printf_symbol_filtered() will
874 * again try to demangle the name on the fly, but
875 * the issue is that if cplus_demangle() fails here,
876 * it'll fail there too. So we want to catch the failure
877 * ("demangled==NULL" case below) here, while we still
878 * have our hands on the function symbol.)
881 funname = DEPRECATED_SYMBOL_NAME (func);
882 funlang = SYMBOL_LANGUAGE (func);
883 if (funlang == language_cplus)
885 demangled = cplus_demangle (funname, DMGL_ANSI);
886 /* If the demangler fails, try the demangled name
887 * from the symbol table. This'll have parameters,
888 * but that's preferable to diplaying a mangled name.
890 if (demangled == NULL)
891 funname = SYMBOL_PRINT_NAME (func);
896 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
899 funname = DEPRECATED_SYMBOL_NAME (msymbol);
900 funlang = SYMBOL_LANGUAGE (msymbol);
903 calling_frame_info = get_prev_frame (fi);
905 if (!addr_exp && frame_relative_level (deprecated_selected_frame) >= 0)
907 printf_filtered ("Stack level %d, frame at ",
908 frame_relative_level (deprecated_selected_frame));
909 print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
910 printf_filtered (":\n");
914 printf_filtered ("Stack frame at ");
915 print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
916 printf_filtered (":\n");
918 printf_filtered (" %s = ", pc_regname);
919 print_address_numeric (get_frame_pc (fi), 1, gdb_stdout);
924 printf_filtered (" in ");
925 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
926 DMGL_ANSI | DMGL_PARAMS);
930 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
931 puts_filtered ("; ");
933 printf_filtered ("saved %s ", pc_regname);
934 print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout);
935 printf_filtered ("\n");
937 if (calling_frame_info)
939 printf_filtered (" called by frame at ");
940 print_address_numeric (get_frame_base (calling_frame_info),
943 if (get_next_frame (fi) && calling_frame_info)
946 if (get_next_frame (fi))
948 printf_filtered (" caller of frame at ");
949 print_address_numeric (get_frame_base (get_next_frame (fi)), 1,
952 if (get_next_frame (fi) || calling_frame_info)
953 puts_filtered ("\n");
955 printf_filtered (" source language %s.\n",
956 language_str (s->language));
959 /* Address of the argument list for this frame, or 0. */
960 CORE_ADDR arg_list = get_frame_args_address (fi);
961 /* Number of args for this frame, or -1 if unknown. */
965 printf_filtered (" Arglist at unknown address.\n");
968 printf_filtered (" Arglist at ");
969 print_address_numeric (arg_list, 1, gdb_stdout);
970 printf_filtered (",");
972 if (!FRAME_NUM_ARGS_P ())
975 puts_filtered (" args: ");
979 numargs = FRAME_NUM_ARGS (fi);
980 gdb_assert (numargs >= 0);
982 puts_filtered (" no args.");
983 else if (numargs == 1)
984 puts_filtered (" 1 arg: ");
986 printf_filtered (" %d args: ", numargs);
988 print_frame_args (func, fi, numargs, gdb_stdout);
989 puts_filtered ("\n");
993 /* Address of the local variables for this frame, or 0. */
994 CORE_ADDR arg_list = get_frame_locals_address (fi);
997 printf_filtered (" Locals at unknown address,");
1000 printf_filtered (" Locals at ");
1001 print_address_numeric (arg_list, 1, gdb_stdout);
1002 printf_filtered (",");
1006 if (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()
1007 && deprecated_get_frame_saved_regs (fi) == NULL)
1008 DEPRECATED_FRAME_INIT_SAVED_REGS (fi);
1009 /* Print as much information as possible on the location of all the
1012 enum lval_type lval;
1020 /* The sp is special; what's displayed isn't the save address, but
1021 the value of the previous frame's sp. This is a legacy thing,
1022 at one stage the frame cached the previous frame's SP instead
1023 of its address, hence it was easiest to just display the cached
1027 /* Find out the location of the saved stack pointer with out
1028 actually evaluating it. */
1029 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1031 if (!optimized && lval == not_lval)
1033 char value[MAX_REGISTER_SIZE];
1035 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1037 /* NOTE: cagney/2003-05-22: This is assuming that the
1038 stack pointer was packed as an unsigned integer. That
1039 may or may not be valid. */
1040 sp = extract_unsigned_integer (value, DEPRECATED_REGISTER_RAW_SIZE (SP_REGNUM));
1041 printf_filtered (" Previous frame's sp is ");
1042 print_address_numeric (sp, 1, gdb_stdout);
1043 printf_filtered ("\n");
1046 else if (!optimized && lval == lval_memory)
1048 printf_filtered (" Previous frame's sp at ");
1049 print_address_numeric (addr, 1, gdb_stdout);
1050 printf_filtered ("\n");
1053 else if (!optimized && lval == lval_register)
1055 printf_filtered (" Previous frame's sp in %s\n",
1056 REGISTER_NAME (realnum));
1059 /* else keep quiet. */
1063 numregs = NUM_REGS + NUM_PSEUDO_REGS;
1064 for (i = 0; i < numregs; i++)
1066 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup))
1068 /* Find out the location of the saved register without
1069 fetching the corresponding value. */
1070 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1072 /* For moment, only display registers that were saved on the
1074 if (!optimized && lval == lval_memory)
1077 puts_filtered (" Saved registers:\n ");
1079 puts_filtered (",");
1081 printf_filtered (" %s at ", REGISTER_NAME (i));
1082 print_address_numeric (addr, 1, gdb_stdout);
1086 if (count || need_nl)
1087 puts_filtered ("\n");
1091 /* Print briefly all stack frames or just the innermost COUNT frames. */
1093 static void backtrace_command_1 (char *count_exp, int show_locals,
1096 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1098 struct frame_info *fi;
1101 struct frame_info *trailing;
1104 if (!target_has_stack)
1105 error ("No stack.");
1107 /* The following code must do two things. First, it must
1108 set the variable TRAILING to the frame from which we should start
1109 printing. Second, it must set the variable count to the number
1110 of frames which we should print, or -1 if all of them. */
1111 trailing = get_current_frame ();
1113 /* The target can be in a state where there is no valid frames
1114 (e.g., just connected). */
1115 if (trailing == NULL)
1116 error ("No stack.");
1121 count = parse_and_eval_long (count_exp);
1124 struct frame_info *current;
1129 while (current && count--)
1132 current = get_prev_frame (current);
1135 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1136 will be COUNT below it. */
1140 trailing = get_prev_frame (trailing);
1141 current = get_prev_frame (current);
1153 struct partial_symtab *ps;
1155 /* Read in symbols for all of the frames. Need to do this in
1156 a separate pass so that "Reading in symbols for xxx" messages
1157 don't screw up the appearance of the backtrace. Also
1158 if people have strong opinions against reading symbols for
1159 backtrace this may have to be an option. */
1163 fi = get_prev_frame (fi))
1166 ps = find_pc_psymtab (get_frame_address_in_block (fi));
1168 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */
1172 for (i = 0, fi = trailing;
1174 i++, fi = get_prev_frame (fi))
1178 /* Don't use print_stack_frame; if an error() occurs it probably
1179 means further attempts to backtrace would fail (on the other
1180 hand, perhaps the code does or could be fixed to make sure
1181 the frame->prev field gets set to NULL in that case). */
1182 print_frame_info (fi, 1, LOCATION, 1);
1184 print_frame_local_vars (fi, 1, gdb_stdout);
1187 /* If we've stopped before the end, mention that. */
1189 printf_filtered ("(More stack frames follow...)\n");
1193 backtrace_command (char *arg, int from_tty)
1195 struct cleanup *old_chain = (struct cleanup *) NULL;
1196 char **argv = (char **) NULL;
1197 int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0;
1200 if (arg != (char *) NULL)
1204 argv = buildargv (arg);
1205 old_chain = make_cleanup_freeargv (argv);
1207 for (i = 0; (argv[i] != (char *) NULL); i++)
1211 for (j = 0; (j < strlen (argv[i])); j++)
1212 argv[i][j] = tolower (argv[i][j]);
1214 if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full"))
1215 argIndicatingFullTrace = argc;
1219 totArgLen += strlen (argv[i]);
1223 if (argIndicatingFullTrace >= 0)
1227 argPtr = (char *) xmalloc (totArgLen + 1);
1232 memset (argPtr, 0, totArgLen + 1);
1233 for (i = 0; (i < (argc + 1)); i++)
1235 if (i != argIndicatingFullTrace)
1237 strcat (argPtr, argv[i]);
1238 strcat (argPtr, " ");
1244 argPtr = (char *) NULL;
1248 backtrace_command_1 (argPtr, (argIndicatingFullTrace >= 0), from_tty);
1250 if (argIndicatingFullTrace >= 0 && totArgLen > 0)
1254 do_cleanups (old_chain);
1257 static void backtrace_full_command (char *arg, int from_tty);
1259 backtrace_full_command (char *arg, int from_tty)
1261 backtrace_command_1 (arg, 1, from_tty);
1265 /* Print the local variables of a block B active in FRAME.
1266 Return 1 if any variables were printed; 0 otherwise. */
1269 print_block_frame_locals (struct block *b, struct frame_info *fi,
1270 int num_tabs, struct ui_file *stream)
1272 struct dict_iterator iter;
1275 int values_printed = 0;
1277 ALL_BLOCK_SYMBOLS (b, iter, sym)
1279 switch (SYMBOL_CLASS (sym))
1287 for (j = 0; j < num_tabs; j++)
1288 fputs_filtered ("\t", stream);
1289 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1290 fputs_filtered (" = ", stream);
1291 print_variable_value (sym, fi, stream);
1292 fprintf_filtered (stream, "\n");
1296 /* Ignore symbols which are not locals. */
1300 return values_printed;
1303 /* Same, but print labels. */
1306 print_block_frame_labels (struct block *b, int *have_default,
1307 struct ui_file *stream)
1309 struct dict_iterator iter;
1311 int values_printed = 0;
1313 ALL_BLOCK_SYMBOLS (b, iter, sym)
1315 if (strcmp (DEPRECATED_SYMBOL_NAME (sym), "default") == 0)
1321 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1323 struct symtab_and_line sal;
1324 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1326 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1329 fprintf_filtered (stream, " ");
1330 print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
1332 fprintf_filtered (stream, " in file %s, line %d\n",
1333 sal.symtab->filename, sal.line);
1336 return values_printed;
1339 /* Print on STREAM all the local variables in frame FRAME,
1340 including all the blocks active in that frame
1343 Returns 1 if the job was done,
1344 or 0 if nothing was printed because we have no info
1345 on the function running in FRAME. */
1348 print_frame_local_vars (struct frame_info *fi, int num_tabs,
1349 struct ui_file *stream)
1351 struct block *block = get_frame_block (fi, 0);
1352 int values_printed = 0;
1356 fprintf_filtered (stream, "No symbol table info available.\n");
1362 if (print_block_frame_locals (block, fi, num_tabs, stream))
1364 /* After handling the function's top-level block, stop.
1365 Don't continue to its superblock, the block of
1366 per-file symbols. */
1367 if (BLOCK_FUNCTION (block))
1369 block = BLOCK_SUPERBLOCK (block);
1372 if (!values_printed)
1374 fprintf_filtered (stream, "No locals.\n");
1378 /* Same, but print labels. */
1381 print_frame_label_vars (struct frame_info *fi, int this_level_only,
1382 struct ui_file *stream)
1384 struct blockvector *bl;
1385 struct block *block = get_frame_block (fi, 0);
1386 int values_printed = 0;
1387 int index, have_default = 0;
1388 char *blocks_printed;
1389 CORE_ADDR pc = get_frame_pc (fi);
1393 fprintf_filtered (stream, "No symbol table info available.\n");
1397 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
1398 blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1399 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1403 CORE_ADDR end = BLOCK_END (block) - 4;
1406 if (bl != blockvector_for_pc (end, &index))
1407 error ("blockvector blotch");
1408 if (BLOCKVECTOR_BLOCK (bl, index) != block)
1409 error ("blockvector botch");
1410 last_index = BLOCKVECTOR_NBLOCKS (bl);
1413 /* Don't print out blocks that have gone by. */
1414 while (index < last_index
1415 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
1418 while (index < last_index
1419 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
1421 if (blocks_printed[index] == 0)
1423 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
1425 blocks_printed[index] = 1;
1431 if (values_printed && this_level_only)
1434 /* After handling the function's top-level block, stop.
1435 Don't continue to its superblock, the block of
1436 per-file symbols. */
1437 if (BLOCK_FUNCTION (block))
1439 block = BLOCK_SUPERBLOCK (block);
1442 if (!values_printed && !this_level_only)
1444 fprintf_filtered (stream, "No catches.\n");
1449 locals_info (char *args, int from_tty)
1451 if (!deprecated_selected_frame)
1452 error ("No frame selected.");
1453 print_frame_local_vars (deprecated_selected_frame, 0, gdb_stdout);
1457 catch_info (char *ignore, int from_tty)
1459 struct symtab_and_line *sal;
1461 /* Check for target support for exception handling */
1462 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
1465 /* Currently not handling this */
1466 /* Ideally, here we should interact with the C++ runtime
1467 system to find the list of active handlers, etc. */
1468 fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n");
1472 /* Assume g++ compiled code -- old v 4.16 behaviour */
1473 if (!deprecated_selected_frame)
1474 error ("No frame selected.");
1476 print_frame_label_vars (deprecated_selected_frame, 0, gdb_stdout);
1481 print_frame_arg_vars (struct frame_info *fi,
1482 struct ui_file *stream)
1484 struct symbol *func = get_frame_function (fi);
1486 struct dict_iterator iter;
1487 struct symbol *sym, *sym2;
1488 int values_printed = 0;
1492 fprintf_filtered (stream, "No symbol table info available.\n");
1496 b = SYMBOL_BLOCK_VALUE (func);
1497 ALL_BLOCK_SYMBOLS (b, iter, sym)
1499 switch (SYMBOL_CLASS (sym))
1505 case LOC_REGPARM_ADDR:
1506 case LOC_BASEREG_ARG:
1507 case LOC_COMPUTED_ARG:
1509 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1510 fputs_filtered (" = ", stream);
1512 /* We have to look up the symbol because arguments can have
1513 two entries (one a parameter, one a local) and the one we
1514 want is the local, which lookup_symbol will find for us.
1515 This includes gcc1 (not gcc2) on the sparc when passing a
1516 small structure and gcc2 when the argument type is float
1517 and it is passed as a double and converted to float by
1518 the prologue (in the latter case the type of the LOC_ARG
1519 symbol is double and the type of the LOC_LOCAL symbol is
1520 float). There are also LOC_ARG/LOC_REGISTER pairs which
1521 are not combined in symbol-reading. */
1523 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
1524 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
1525 print_variable_value (sym2, fi, stream);
1526 fprintf_filtered (stream, "\n");
1530 /* Don't worry about things which aren't arguments. */
1534 if (!values_printed)
1536 fprintf_filtered (stream, "No arguments.\n");
1541 args_info (char *ignore, int from_tty)
1543 if (!deprecated_selected_frame)
1544 error ("No frame selected.");
1545 print_frame_arg_vars (deprecated_selected_frame, gdb_stdout);
1550 args_plus_locals_info (char *ignore, int from_tty)
1552 args_info (ignore, from_tty);
1553 locals_info (ignore, from_tty);
1557 /* Select frame FI. Also print the stack frame and show the source if
1558 this is the tui version. */
1560 select_and_print_frame (struct frame_info *fi)
1564 print_stack_frame (fi, 1, SRC_AND_LOC);
1567 /* Return the symbol-block in which the selected frame is executing.
1568 Can return zero under various legitimate circumstances.
1570 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1571 code address within the block returned. We use this to decide
1572 which macros are in scope. */
1575 get_selected_block (CORE_ADDR *addr_in_block)
1577 if (!target_has_stack)
1580 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1581 a selected/current frame? Perhaphs this function is called,
1582 indirectly, by WFI in "infrun.c" where avoiding the creation of
1583 an inner most frame is very important (it slows down single
1584 step). I suspect, though that this was true in the deep dark
1585 past but is no longer the case. A mindless look at all the
1586 callers tends to support this theory. I think we should be able
1587 to assume that there is always a selcted frame. */
1588 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1590 if (!deprecated_selected_frame)
1592 CORE_ADDR pc = read_pc ();
1593 if (addr_in_block != NULL)
1594 *addr_in_block = pc;
1595 return block_for_pc (pc);
1597 return get_frame_block (deprecated_selected_frame, addr_in_block);
1600 /* Find a frame a certain number of levels away from FRAME.
1601 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1602 Positive means go to earlier frames (up); negative, the reverse.
1603 The int that contains the number of levels is counted toward
1604 zero as the frames for those levels are found.
1605 If the top or bottom frame is reached, that frame is returned,
1606 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1607 how much farther the original request asked to go. */
1610 find_relative_frame (struct frame_info *frame,
1611 int *level_offset_ptr)
1613 struct frame_info *prev;
1614 struct frame_info *frame1;
1616 /* Going up is simple: just do get_prev_frame enough times
1617 or until initial frame is reached. */
1618 while (*level_offset_ptr > 0)
1620 prev = get_prev_frame (frame);
1623 (*level_offset_ptr)--;
1626 /* Going down is just as simple. */
1627 if (*level_offset_ptr < 0)
1629 while (*level_offset_ptr < 0)
1631 frame1 = get_next_frame (frame);
1635 (*level_offset_ptr)++;
1641 /* The "select_frame" command. With no arg, NOP.
1642 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1643 valid level. Otherwise, treat level_exp as an address expression
1644 and select it. See parse_frame_specification for more info on proper
1645 frame expressions. */
1648 select_frame_command (char *level_exp, int from_tty)
1650 struct frame_info *frame;
1652 if (!target_has_stack)
1653 error ("No stack.");
1655 frame = parse_frame_specification (level_exp);
1657 select_frame (frame);
1660 /* The "frame" command. With no arg, print selected frame briefly.
1661 With arg, behaves like select_frame and then prints the selected
1665 frame_command (char *level_exp, int from_tty)
1667 select_frame_command (level_exp, from_tty);
1668 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC);
1671 /* The XDB Compatibility command to print the current frame. */
1674 current_frame_command (char *level_exp, int from_tty)
1676 if (target_has_stack == 0 || deprecated_selected_frame == 0)
1677 error ("No stack.");
1678 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC);
1681 /* Select the frame up one or COUNT stack levels
1682 from the previously selected frame, and print it briefly. */
1685 up_silently_base (char *count_exp)
1687 struct frame_info *fi;
1688 int count = 1, count1;
1690 count = parse_and_eval_long (count_exp);
1693 if (target_has_stack == 0 || deprecated_selected_frame == 0)
1694 error ("No stack.");
1696 fi = find_relative_frame (deprecated_selected_frame, &count1);
1697 if (count1 != 0 && count_exp == 0)
1698 error ("Initial frame selected; you cannot go up.");
1703 up_silently_command (char *count_exp, int from_tty)
1705 up_silently_base (count_exp);
1709 up_command (char *count_exp, int from_tty)
1711 up_silently_base (count_exp);
1712 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC);
1715 /* Select the frame down one or COUNT stack levels
1716 from the previously selected frame, and print it briefly. */
1719 down_silently_base (char *count_exp)
1721 struct frame_info *frame;
1722 int count = -1, count1;
1724 count = -parse_and_eval_long (count_exp);
1727 if (target_has_stack == 0 || deprecated_selected_frame == 0)
1728 error ("No stack.");
1730 frame = find_relative_frame (deprecated_selected_frame, &count1);
1731 if (count1 != 0 && count_exp == 0)
1734 /* We only do this if count_exp is not specified. That way "down"
1735 means to really go down (and let me know if that is
1736 impossible), but "down 9999" can be used to mean go all the way
1737 down without getting an error. */
1739 error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
1742 select_frame (frame);
1746 down_silently_command (char *count_exp, int from_tty)
1748 down_silently_base (count_exp);
1752 down_command (char *count_exp, int from_tty)
1754 down_silently_base (count_exp);
1755 print_stack_frame (get_selected_frame (), 1, SRC_AND_LOC);
1759 return_command (char *retval_exp, int from_tty)
1761 struct symbol *thisfun;
1762 struct value *return_value = NULL;
1763 const char *query_prefix = "";
1765 /* FIXME: cagney/2003-10-20: Perform a minimal existance test on the
1766 target. If that fails, error out. For the moment don't rely on
1767 get_selected_frame as it's error message is the the singularly
1768 obscure "No registers". */
1769 if (!target_has_registers)
1770 error ("No selected frame.");
1771 thisfun = get_frame_function (get_selected_frame ());
1773 /* Compute the return value. If the computation triggers an error,
1774 let it bail. If the return type can't be handled, set
1775 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1779 struct type *return_type = NULL;
1781 /* Compute the return value. Should the computation fail, this
1782 call throws an error. */
1783 return_value = parse_and_eval (retval_exp);
1785 /* Cast return value to the return type of the function. Should
1786 the cast fail, this call throws an error. */
1787 if (thisfun != NULL)
1788 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1789 if (return_type == NULL)
1790 return_type = builtin_type_int;
1791 CHECK_TYPEDEF (return_type);
1792 return_value = value_cast (return_type, return_value);
1794 /* Make sure the value is fully evaluated. It may live in the
1795 stack frame we're about to pop. */
1796 if (VALUE_LAZY (return_value))
1797 value_fetch_lazy (return_value);
1799 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1800 /* If the return-type is "void", don't try to find the
1801 return-value's location. However, do still evaluate the
1802 return expression so that, even when the expression result
1803 is discarded, side effects such as "return i++" still
1805 return_value = NULL;
1806 /* FIXME: cagney/2004-01-17: If the architecture implements both
1807 return_value and extract_returned_value_address, should allow
1808 "return" to work - don't set return_value to NULL. */
1809 else if (!gdbarch_return_value_p (current_gdbarch)
1810 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT
1811 || TYPE_CODE (return_type) == TYPE_CODE_UNION))
1813 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1814 code. Old architectures don't expect STORE_RETURN_VALUE
1815 to be called with with a small struct that needs to be
1816 stored in registers. Don't start doing it now. */
1818 A structure or union return type is not supported by this architecture.\n\
1819 If you continue, the return value that you specified will be ignored.\n";
1820 return_value = NULL;
1822 else if (using_struct_return (return_type, 0))
1825 The location at which to store the function's return value is unknown.\n\
1826 If you continue, the return value that you specified will be ignored.\n";
1827 return_value = NULL;
1831 /* Does an interactive user really want to do this? Include
1832 information, such as how well GDB can handle the return value, in
1833 the query message. */
1837 if (thisfun == NULL)
1838 confirmed = query ("%sMake selected stack frame return now? ",
1841 confirmed = query ("%sMake %s return now? ", query_prefix,
1842 SYMBOL_PRINT_NAME (thisfun));
1844 error ("Not confirmed");
1847 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1848 frame in turn, should this code just go straight to the relevant
1849 frame and pop that? */
1851 /* First discard all frames inner-to the selected frame (making the
1852 selected frame current). */
1854 struct frame_id selected_id = get_frame_id (get_selected_frame ());
1855 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ())))
1857 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ())))
1858 /* Caught in the safety net, oops! We've gone way past the
1860 error ("Problem while popping stack frames (corrupt stack?)");
1861 frame_pop (get_current_frame ());
1865 /* Second discard the selected frame (which is now also the current
1867 frame_pop (get_current_frame ());
1869 /* Store RETURN_VAUE in the just-returned register set. */
1870 if (return_value != NULL)
1872 struct type *return_type = VALUE_TYPE (return_value);
1873 if (!gdbarch_return_value_p (current_gdbarch))
1875 STORE_RETURN_VALUE (return_type, current_regcache,
1876 VALUE_CONTENTS (return_value));
1878 /* FIXME: cagney/2004-01-17: If extract_returned_value_address
1879 is available and the function is using
1880 RETURN_VALUE_STRUCT_CONVENTION, should use it to find the
1881 address of the returned value so that it can be assigned. */
1884 gdb_assert (gdbarch_return_value (current_gdbarch, return_type,
1886 == RETURN_VALUE_REGISTER_CONVENTION);
1887 gdbarch_return_value (current_gdbarch, return_type,
1888 current_regcache, NULL /*read*/,
1889 VALUE_CONTENTS (return_value) /*write*/);
1893 /* If we are at the end of a call dummy now, pop the dummy frame
1895 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1896 frame_pop (get_current_frame ());
1898 /* If interactive, print the frame that is now current. */
1900 frame_command ("0", 1);
1902 select_frame_command ("0", 0);
1905 /* Sets the scope to input function name, provided that the
1906 function is within the current stack frame */
1908 struct function_bounds
1910 CORE_ADDR low, high;
1913 static void func_command (char *arg, int from_tty);
1915 func_command (char *arg, int from_tty)
1917 struct frame_info *fp;
1919 struct symtabs_and_lines sals;
1922 struct function_bounds *func_bounds = (struct function_bounds *) NULL;
1924 if (arg != (char *) NULL)
1927 fp = parse_frame_specification ("0");
1928 sals = decode_line_spec (arg, 1);
1929 func_bounds = (struct function_bounds *) xmalloc (
1930 sizeof (struct function_bounds) * sals.nelts);
1931 for (i = 0; (i < sals.nelts && !found); i++)
1933 if (sals.sals[i].pc == (CORE_ADDR) 0 ||
1934 find_pc_partial_function (sals.sals[i].pc,
1936 &func_bounds[i].low,
1937 &func_bounds[i].high) == 0)
1939 func_bounds[i].low =
1940 func_bounds[i].high = (CORE_ADDR) NULL;
1946 for (i = 0; (i < sals.nelts && !found); i++)
1947 found = (get_frame_pc (fp) >= func_bounds[i].low &&
1948 get_frame_pc (fp) < func_bounds[i].high);
1952 fp = find_relative_frame (fp, &level);
1955 while (!found && level == 0);
1958 xfree (func_bounds);
1961 printf_filtered ("'%s' not within current stack frame.\n", arg);
1962 else if (fp != deprecated_selected_frame)
1963 select_and_print_frame (fp);
1966 /* Gets the language of the current frame. */
1969 get_frame_language (void)
1972 enum language flang; /* The language of the current frame */
1974 if (deprecated_selected_frame)
1976 /* We determine the current frame language by looking up its
1977 associated symtab. To retrieve this symtab, we use the frame PC.
1978 However we cannot use the frame pc as is, because it usually points
1979 to the instruction following the "call", which is sometimes the first
1980 instruction of another function. So we rely on
1981 get_frame_address_in_block(), it provides us with a PC which is
1982 guaranteed to be inside the frame's code block. */
1983 s = find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame));
1985 flang = s->language;
1987 flang = language_unknown;
1990 flang = language_unknown;
1996 _initialize_stack (void)
1999 backtrace_limit = 30;
2002 add_com ("return", class_stack, return_command,
2003 "Make selected stack frame return to its caller.\n\
2004 Control remains in the debugger, but when you continue\n\
2005 execution will resume in the frame above the one now selected.\n\
2006 If an argument is given, it is an expression for the value to return.");
2008 add_com ("up", class_stack, up_command,
2009 "Select and print stack frame that called this one.\n\
2010 An argument says how many frames up to go.");
2011 add_com ("up-silently", class_support, up_silently_command,
2012 "Same as the `up' command, but does not print anything.\n\
2013 This is useful in command scripts.");
2015 add_com ("down", class_stack, down_command,
2016 "Select and print stack frame called by this one.\n\
2017 An argument says how many frames down to go.");
2018 add_com_alias ("do", "down", class_stack, 1);
2019 add_com_alias ("dow", "down", class_stack, 1);
2020 add_com ("down-silently", class_support, down_silently_command,
2021 "Same as the `down' command, but does not print anything.\n\
2022 This is useful in command scripts.");
2024 add_com ("frame", class_stack, frame_command,
2025 "Select and print a stack frame.\n\
2026 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2027 An argument specifies the frame to select.\n\
2028 It can be a stack frame number or the address of the frame.\n\
2029 With argument, nothing is printed if input is coming from\n\
2030 a command file or a user-defined command.");
2032 add_com_alias ("f", "frame", class_stack, 1);
2036 add_com ("L", class_stack, current_frame_command,
2037 "Print the current stack frame.\n");
2038 add_com_alias ("V", "frame", class_stack, 1);
2040 add_com ("select-frame", class_stack, select_frame_command,
2041 "Select a stack frame without printing anything.\n\
2042 An argument specifies the frame to select.\n\
2043 It can be a stack frame number or the address of the frame.\n");
2045 add_com ("backtrace", class_stack, backtrace_command,
2046 "Print backtrace of all stack frames, or innermost COUNT frames.\n\
2047 With a negative argument, print outermost -COUNT frames.\n\
2048 Use of the 'full' qualifier also prints the values of the local variables.\n");
2049 add_com_alias ("bt", "backtrace", class_stack, 0);
2052 add_com_alias ("t", "backtrace", class_stack, 0);
2053 add_com ("T", class_stack, backtrace_full_command,
2054 "Print backtrace of all stack frames, or innermost COUNT frames \n\
2055 and the values of the local variables.\n\
2056 With a negative argument, print outermost -COUNT frames.\n\
2057 Usage: T <count>\n");
2060 add_com_alias ("where", "backtrace", class_alias, 0);
2061 add_info ("stack", backtrace_command,
2062 "Backtrace of the stack, or innermost COUNT frames.");
2063 add_info_alias ("s", "stack", 1);
2064 add_info ("frame", frame_info,
2065 "All about selected stack frame, or frame at ADDR.");
2066 add_info_alias ("f", "frame", 1);
2067 add_info ("locals", locals_info,
2068 "Local variables of current stack frame.");
2069 add_info ("args", args_info,
2070 "Argument variables of current stack frame.");
2072 add_com ("l", class_info, args_plus_locals_info,
2073 "Argument and local variables of current stack frame.");
2076 add_com ("func", class_stack, func_command,
2077 "Select the stack frame that contains <func>.\nUsage: func <name>\n");
2079 add_info ("catch", catch_info,
2080 "Exceptions that can be caught in the current stack frame.");
2083 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command,
2084 "Specify maximum number of frames for \"backtrace\" to print by default.",
2086 add_info ("backtrace-limit", backtrace_limit_info,
2087 "The maximum number of frames for \"backtrace\" to print by default.");