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 SETUP_ARBITRARY_FRAME is defined, then frame
821 specifications take at least 2 addresses. It is important to
822 detect this case here so that "frame 100" does not give a
823 confusing error message like "frame specification requires
824 two addresses". This of course does not solve the "frame
825 100" problem for machines on which a frame specification can
826 be made with one address. To solve that, we need a new
827 syntax for a specifying a frame by address. I think the
828 cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for two
829 args, etc.), but people might think that is too much typing,
830 so I guess *0x23,0x45 would be a possible alternative (commas
831 really should be used instead of spaces to delimit; using
832 spaces normally works in an expression). */
833 #ifdef SETUP_ARBITRARY_FRAME
834 error (_("No frame %s"), paddr_d (addrs[0]));
836 /* If (s)he specifies the frame with an address, he deserves
837 what (s)he gets. Still, give the highest one that matches.
838 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
840 for (fid = get_current_frame ();
842 fid = get_prev_frame (fid))
844 if (frame_id_eq (id, get_frame_id (fid)))
846 while (frame_id_eq (id, frame_unwind_id (fid)))
847 fid = get_prev_frame (fid);
853 /* We couldn't identify the frame as an existing frame, but
854 perhaps we can create one with a single argument. */
856 return create_new_frame (addrs[0], 0);
857 else if (numargs == 2)
858 return create_new_frame (addrs[0], addrs[1]);
860 error (_("Too many args in frame specification"));
864 parse_frame_specification (char *frame_exp)
866 return parse_frame_specification_1 (frame_exp, NULL, NULL);
869 /* Print verbosely the selected frame or the frame at address ADDR.
870 This means absolutely all information in the frame is printed. */
873 frame_info (char *addr_exp, int from_tty)
875 struct frame_info *fi;
876 struct symtab_and_line sal;
879 struct frame_info *calling_frame_info;
880 int i, count, numregs;
882 enum language funlang = language_unknown;
883 const char *pc_regname;
884 int selected_frame_p;
886 fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
888 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
889 is not a good name. */
891 /* OK, this is weird. The PC_REGNUM hardware register's value can
892 easily not match that of the internal value returned by
894 pc_regname = REGISTER_NAME (PC_REGNUM);
896 /* But then, this is weird to. Even without PC_REGNUM, an
897 architectures will often have a hardware register called "pc",
898 and that register's value, again, can easily not match
902 find_frame_sal (fi, &sal);
903 func = get_frame_function (fi);
904 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
906 s = find_pc_symtab (get_frame_pc (fi));
909 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
910 * the demangled name that we already have stored in
911 * the symbol table, but we stored a version with
912 * DMGL_PARAMS turned on, and here we don't want
913 * to display parameters. So call the demangler again,
914 * with DMGL_ANSI only. RT
915 * (Yes, I know that printf_symbol_filtered() will
916 * again try to demangle the name on the fly, but
917 * the issue is that if cplus_demangle() fails here,
918 * it'll fail there too. So we want to catch the failure
919 * ("demangled==NULL" case below) here, while we still
920 * have our hands on the function symbol.)
923 funname = DEPRECATED_SYMBOL_NAME (func);
924 funlang = SYMBOL_LANGUAGE (func);
925 if (funlang == language_cplus)
927 demangled = cplus_demangle (funname, DMGL_ANSI);
928 /* If the demangler fails, try the demangled name
929 * from the symbol table. This'll have parameters,
930 * but that's preferable to diplaying a mangled name.
932 if (demangled == NULL)
933 funname = SYMBOL_PRINT_NAME (func);
938 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
941 funname = DEPRECATED_SYMBOL_NAME (msymbol);
942 funlang = SYMBOL_LANGUAGE (msymbol);
945 calling_frame_info = get_prev_frame (fi);
947 if (selected_frame_p && frame_relative_level (fi) >= 0)
949 printf_filtered (_("Stack level %d, frame at "),
950 frame_relative_level (fi));
951 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
952 printf_filtered (":\n");
956 printf_filtered (_("Stack frame at "));
957 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
958 printf_filtered (":\n");
960 printf_filtered (" %s = ", pc_regname);
961 deprecated_print_address_numeric (get_frame_pc (fi), 1, gdb_stdout);
966 printf_filtered (" in ");
967 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
968 DMGL_ANSI | DMGL_PARAMS);
972 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
973 puts_filtered ("; ");
975 printf_filtered ("saved %s ", pc_regname);
976 deprecated_print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout);
977 printf_filtered ("\n");
979 if (calling_frame_info)
981 printf_filtered (" called by frame at ");
982 deprecated_print_address_numeric (get_frame_base (calling_frame_info),
985 if (get_next_frame (fi) && calling_frame_info)
988 if (get_next_frame (fi))
990 printf_filtered (" caller of frame at ");
991 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi)), 1,
994 if (get_next_frame (fi) || calling_frame_info)
995 puts_filtered ("\n");
997 printf_filtered (" source language %s.\n",
998 language_str (s->language));
1001 /* Address of the argument list for this frame, or 0. */
1002 CORE_ADDR arg_list = get_frame_args_address (fi);
1003 /* Number of args for this frame, or -1 if unknown. */
1007 printf_filtered (" Arglist at unknown address.\n");
1010 printf_filtered (" Arglist at ");
1011 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
1012 printf_filtered (",");
1014 if (!FRAME_NUM_ARGS_P ())
1017 puts_filtered (" args: ");
1021 numargs = FRAME_NUM_ARGS (fi);
1022 gdb_assert (numargs >= 0);
1024 puts_filtered (" no args.");
1025 else if (numargs == 1)
1026 puts_filtered (" 1 arg: ");
1028 printf_filtered (" %d args: ", numargs);
1030 print_frame_args (func, fi, numargs, gdb_stdout);
1031 puts_filtered ("\n");
1035 /* Address of the local variables for this frame, or 0. */
1036 CORE_ADDR arg_list = get_frame_locals_address (fi);
1039 printf_filtered (" Locals at unknown address,");
1042 printf_filtered (" Locals at ");
1043 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
1044 printf_filtered (",");
1048 /* Print as much information as possible on the location of all the
1051 enum lval_type lval;
1059 /* The sp is special; what's displayed isn't the save address, but
1060 the value of the previous frame's sp. This is a legacy thing,
1061 at one stage the frame cached the previous frame's SP instead
1062 of its address, hence it was easiest to just display the cached
1066 /* Find out the location of the saved stack pointer with out
1067 actually evaluating it. */
1068 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1070 if (!optimized && lval == not_lval)
1072 char value[MAX_REGISTER_SIZE];
1074 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1076 /* NOTE: cagney/2003-05-22: This is assuming that the
1077 stack pointer was packed as an unsigned integer. That
1078 may or may not be valid. */
1079 sp = extract_unsigned_integer (value, register_size (current_gdbarch, SP_REGNUM));
1080 printf_filtered (" Previous frame's sp is ");
1081 deprecated_print_address_numeric (sp, 1, gdb_stdout);
1082 printf_filtered ("\n");
1085 else if (!optimized && lval == lval_memory)
1087 printf_filtered (" Previous frame's sp at ");
1088 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1089 printf_filtered ("\n");
1092 else if (!optimized && lval == lval_register)
1094 printf_filtered (" Previous frame's sp in %s\n",
1095 REGISTER_NAME (realnum));
1098 /* else keep quiet. */
1102 numregs = NUM_REGS + NUM_PSEUDO_REGS;
1103 for (i = 0; i < numregs; i++)
1105 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup))
1107 /* Find out the location of the saved register without
1108 fetching the corresponding value. */
1109 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1111 /* For moment, only display registers that were saved on the
1113 if (!optimized && lval == lval_memory)
1116 puts_filtered (" Saved registers:\n ");
1118 puts_filtered (",");
1120 printf_filtered (" %s at ", REGISTER_NAME (i));
1121 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1125 if (count || need_nl)
1126 puts_filtered ("\n");
1130 /* Print briefly all stack frames or just the innermost COUNT frames. */
1132 static void backtrace_command_1 (char *count_exp, int show_locals,
1135 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1137 struct frame_info *fi;
1140 struct frame_info *trailing;
1143 if (!target_has_stack)
1144 error (_("No stack."));
1146 /* The following code must do two things. First, it must
1147 set the variable TRAILING to the frame from which we should start
1148 printing. Second, it must set the variable count to the number
1149 of frames which we should print, or -1 if all of them. */
1150 trailing = get_current_frame ();
1152 /* The target can be in a state where there is no valid frames
1153 (e.g., just connected). */
1154 if (trailing == NULL)
1155 error (_("No stack."));
1160 count = parse_and_eval_long (count_exp);
1163 struct frame_info *current;
1168 while (current && count--)
1171 current = get_prev_frame (current);
1174 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1175 will be COUNT below it. */
1179 trailing = get_prev_frame (trailing);
1180 current = get_prev_frame (current);
1192 struct partial_symtab *ps;
1194 /* Read in symbols for all of the frames. Need to do this in
1195 a separate pass so that "Reading in symbols for xxx" messages
1196 don't screw up the appearance of the backtrace. Also
1197 if people have strong opinions against reading symbols for
1198 backtrace this may have to be an option. */
1202 fi = get_prev_frame (fi))
1205 ps = find_pc_psymtab (get_frame_address_in_block (fi));
1207 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */
1211 for (i = 0, fi = trailing;
1213 i++, fi = get_prev_frame (fi))
1217 /* Don't use print_stack_frame; if an error() occurs it probably
1218 means further attempts to backtrace would fail (on the other
1219 hand, perhaps the code does or could be fixed to make sure
1220 the frame->prev field gets set to NULL in that case). */
1221 print_frame_info (fi, 1, LOCATION, 1);
1223 print_frame_local_vars (fi, 1, gdb_stdout);
1226 /* If we've stopped before the end, mention that. */
1228 printf_filtered (_("(More stack frames follow...)\n"));
1231 struct backtrace_command_args
1238 /* Stub to call backtrace_command_1 by way of an error catcher. */
1240 backtrace_command_stub (void *data)
1242 struct backtrace_command_args *args = (struct backtrace_command_args *)data;
1243 backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty);
1248 backtrace_command (char *arg, int from_tty)
1250 struct cleanup *old_chain = (struct cleanup *) NULL;
1251 char **argv = (char **) NULL;
1252 int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0;
1254 struct backtrace_command_args btargs;
1256 if (arg != (char *) NULL)
1260 argv = buildargv (arg);
1261 old_chain = make_cleanup_freeargv (argv);
1263 for (i = 0; (argv[i] != (char *) NULL); i++)
1267 for (j = 0; (j < strlen (argv[i])); j++)
1268 argv[i][j] = tolower (argv[i][j]);
1270 if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full"))
1271 argIndicatingFullTrace = argc;
1275 totArgLen += strlen (argv[i]);
1279 if (argIndicatingFullTrace >= 0)
1283 argPtr = (char *) xmalloc (totArgLen + 1);
1288 memset (argPtr, 0, totArgLen + 1);
1289 for (i = 0; (i < (argc + 1)); i++)
1291 if (i != argIndicatingFullTrace)
1293 strcat (argPtr, argv[i]);
1294 strcat (argPtr, " ");
1300 argPtr = (char *) NULL;
1304 btargs.count_exp = argPtr;
1305 btargs.show_locals = (argIndicatingFullTrace >= 0);
1306 btargs.from_tty = from_tty;
1307 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR);
1309 if (argIndicatingFullTrace >= 0 && totArgLen > 0)
1313 do_cleanups (old_chain);
1316 static void backtrace_full_command (char *arg, int from_tty);
1318 backtrace_full_command (char *arg, int from_tty)
1320 struct backtrace_command_args btargs;
1321 btargs.count_exp = arg;
1322 btargs.show_locals = 1;
1323 btargs.from_tty = from_tty;
1324 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR);
1328 /* Print the local variables of a block B active in FRAME.
1329 Return 1 if any variables were printed; 0 otherwise. */
1332 print_block_frame_locals (struct block *b, struct frame_info *fi,
1333 int num_tabs, struct ui_file *stream)
1335 struct dict_iterator iter;
1338 int values_printed = 0;
1340 ALL_BLOCK_SYMBOLS (b, iter, sym)
1342 switch (SYMBOL_CLASS (sym))
1350 for (j = 0; j < num_tabs; j++)
1351 fputs_filtered ("\t", stream);
1352 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1353 fputs_filtered (" = ", stream);
1354 print_variable_value (sym, fi, stream);
1355 fprintf_filtered (stream, "\n");
1359 /* Ignore symbols which are not locals. */
1363 return values_printed;
1366 /* Same, but print labels. */
1369 print_block_frame_labels (struct block *b, int *have_default,
1370 struct ui_file *stream)
1372 struct dict_iterator iter;
1374 int values_printed = 0;
1376 ALL_BLOCK_SYMBOLS (b, iter, sym)
1378 if (strcmp (DEPRECATED_SYMBOL_NAME (sym), "default") == 0)
1384 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1386 struct symtab_and_line sal;
1387 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1389 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1392 fprintf_filtered (stream, " ");
1393 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
1395 fprintf_filtered (stream, " in file %s, line %d\n",
1396 sal.symtab->filename, sal.line);
1399 return values_printed;
1402 /* Print on STREAM all the local variables in frame FRAME,
1403 including all the blocks active in that frame
1406 Returns 1 if the job was done,
1407 or 0 if nothing was printed because we have no info
1408 on the function running in FRAME. */
1411 print_frame_local_vars (struct frame_info *fi, int num_tabs,
1412 struct ui_file *stream)
1414 struct block *block = get_frame_block (fi, 0);
1415 int values_printed = 0;
1419 fprintf_filtered (stream, "No symbol table info available.\n");
1425 if (print_block_frame_locals (block, fi, num_tabs, stream))
1427 /* After handling the function's top-level block, stop.
1428 Don't continue to its superblock, the block of
1429 per-file symbols. */
1430 if (BLOCK_FUNCTION (block))
1432 block = BLOCK_SUPERBLOCK (block);
1435 if (!values_printed)
1437 fprintf_filtered (stream, "No locals.\n");
1441 /* Same, but print labels. */
1444 print_frame_label_vars (struct frame_info *fi, int this_level_only,
1445 struct ui_file *stream)
1447 struct blockvector *bl;
1448 struct block *block = get_frame_block (fi, 0);
1449 int values_printed = 0;
1450 int index, have_default = 0;
1451 char *blocks_printed;
1452 CORE_ADDR pc = get_frame_pc (fi);
1456 fprintf_filtered (stream, "No symbol table info available.\n");
1460 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
1461 blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1462 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1466 CORE_ADDR end = BLOCK_END (block) - 4;
1469 if (bl != blockvector_for_pc (end, &index))
1470 error (_("blockvector blotch"));
1471 if (BLOCKVECTOR_BLOCK (bl, index) != block)
1472 error (_("blockvector botch"));
1473 last_index = BLOCKVECTOR_NBLOCKS (bl);
1476 /* Don't print out blocks that have gone by. */
1477 while (index < last_index
1478 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
1481 while (index < last_index
1482 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
1484 if (blocks_printed[index] == 0)
1486 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
1488 blocks_printed[index] = 1;
1494 if (values_printed && this_level_only)
1497 /* After handling the function's top-level block, stop.
1498 Don't continue to its superblock, the block of
1499 per-file symbols. */
1500 if (BLOCK_FUNCTION (block))
1502 block = BLOCK_SUPERBLOCK (block);
1505 if (!values_printed && !this_level_only)
1507 fprintf_filtered (stream, "No catches.\n");
1512 locals_info (char *args, int from_tty)
1514 print_frame_local_vars (get_selected_frame ("No frame selected."),
1519 catch_info (char *ignore, int from_tty)
1521 struct symtab_and_line *sal;
1523 /* Check for target support for exception handling */
1524 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
1527 /* Currently not handling this */
1528 /* Ideally, here we should interact with the C++ runtime
1529 system to find the list of active handlers, etc. */
1530 fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n");
1534 /* Assume g++ compiled code -- old v 4.16 behaviour */
1535 print_frame_label_vars (get_selected_frame ("No frame selected."),
1541 print_frame_arg_vars (struct frame_info *fi,
1542 struct ui_file *stream)
1544 struct symbol *func = get_frame_function (fi);
1546 struct dict_iterator iter;
1547 struct symbol *sym, *sym2;
1548 int values_printed = 0;
1552 fprintf_filtered (stream, "No symbol table info available.\n");
1556 b = SYMBOL_BLOCK_VALUE (func);
1557 ALL_BLOCK_SYMBOLS (b, iter, sym)
1559 switch (SYMBOL_CLASS (sym))
1565 case LOC_REGPARM_ADDR:
1566 case LOC_BASEREG_ARG:
1567 case LOC_COMPUTED_ARG:
1569 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1570 fputs_filtered (" = ", stream);
1572 /* We have to look up the symbol because arguments can have
1573 two entries (one a parameter, one a local) and the one we
1574 want is the local, which lookup_symbol will find for us.
1575 This includes gcc1 (not gcc2) on the sparc when passing a
1576 small structure and gcc2 when the argument type is float
1577 and it is passed as a double and converted to float by
1578 the prologue (in the latter case the type of the LOC_ARG
1579 symbol is double and the type of the LOC_LOCAL symbol is
1580 float). There are also LOC_ARG/LOC_REGISTER pairs which
1581 are not combined in symbol-reading. */
1583 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
1584 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
1585 print_variable_value (sym2, fi, stream);
1586 fprintf_filtered (stream, "\n");
1590 /* Don't worry about things which aren't arguments. */
1594 if (!values_printed)
1596 fprintf_filtered (stream, "No arguments.\n");
1601 args_info (char *ignore, int from_tty)
1603 print_frame_arg_vars (get_selected_frame ("No frame selected."),
1609 args_plus_locals_info (char *ignore, int from_tty)
1611 args_info (ignore, from_tty);
1612 locals_info (ignore, from_tty);
1616 /* Select frame FI. Also print the stack frame and show the source if
1617 this is the tui version. */
1619 select_and_print_frame (struct frame_info *fi)
1623 print_stack_frame (fi, 1, SRC_AND_LOC);
1626 /* Return the symbol-block in which the selected frame is executing.
1627 Can return zero under various legitimate circumstances.
1629 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1630 code address within the block returned. We use this to decide
1631 which macros are in scope. */
1634 get_selected_block (CORE_ADDR *addr_in_block)
1636 if (!target_has_stack)
1639 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1640 a selected/current frame? Perhaps this function is called,
1641 indirectly, by WFI in "infrun.c" where avoiding the creation of
1642 an inner most frame is very important (it slows down single
1643 step). I suspect, though that this was true in the deep dark
1644 past but is no longer the case. A mindless look at all the
1645 callers tends to support this theory. I think we should be able
1646 to assume that there is always a selcted frame. */
1647 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1649 if (!deprecated_selected_frame)
1651 CORE_ADDR pc = read_pc ();
1652 if (addr_in_block != NULL)
1653 *addr_in_block = pc;
1654 return block_for_pc (pc);
1656 return get_frame_block (deprecated_selected_frame, addr_in_block);
1659 /* Find a frame a certain number of levels away from FRAME.
1660 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1661 Positive means go to earlier frames (up); negative, the reverse.
1662 The int that contains the number of levels is counted toward
1663 zero as the frames for those levels are found.
1664 If the top or bottom frame is reached, that frame is returned,
1665 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1666 how much farther the original request asked to go. */
1669 find_relative_frame (struct frame_info *frame,
1670 int *level_offset_ptr)
1672 struct frame_info *prev;
1673 struct frame_info *frame1;
1675 /* Going up is simple: just do get_prev_frame enough times
1676 or until initial frame is reached. */
1677 while (*level_offset_ptr > 0)
1679 prev = get_prev_frame (frame);
1682 (*level_offset_ptr)--;
1685 /* Going down is just as simple. */
1686 if (*level_offset_ptr < 0)
1688 while (*level_offset_ptr < 0)
1690 frame1 = get_next_frame (frame);
1694 (*level_offset_ptr)++;
1700 /* The "select_frame" command. With no arg, NOP.
1701 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1702 valid level. Otherwise, treat level_exp as an address expression
1703 and select it. See parse_frame_specification for more info on proper
1704 frame expressions. */
1707 select_frame_command (char *level_exp, int from_tty)
1709 select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
1712 /* The "frame" command. With no arg, print selected frame briefly.
1713 With arg, behaves like select_frame and then prints the selected
1717 frame_command (char *level_exp, int from_tty)
1719 select_frame_command (level_exp, from_tty);
1720 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1723 /* The XDB Compatibility command to print the current frame. */
1726 current_frame_command (char *level_exp, int from_tty)
1728 print_stack_frame (get_selected_frame ("No stack."), 1, SRC_AND_LOC);
1731 /* Select the frame up one or COUNT stack levels
1732 from the previously selected frame, and print it briefly. */
1735 up_silently_base (char *count_exp)
1737 struct frame_info *fi;
1738 int count = 1, count1;
1740 count = parse_and_eval_long (count_exp);
1743 fi = find_relative_frame (get_selected_frame ("No stack."), &count1);
1744 if (count1 != 0 && count_exp == 0)
1745 error (_("Initial frame selected; you cannot go up."));
1750 up_silently_command (char *count_exp, int from_tty)
1752 up_silently_base (count_exp);
1756 up_command (char *count_exp, int from_tty)
1758 up_silently_base (count_exp);
1759 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1762 /* Select the frame down one or COUNT stack levels
1763 from the previously selected frame, and print it briefly. */
1766 down_silently_base (char *count_exp)
1768 struct frame_info *frame;
1769 int count = -1, count1;
1771 count = -parse_and_eval_long (count_exp);
1774 frame = find_relative_frame (get_selected_frame ("No stack."), &count1);
1775 if (count1 != 0 && count_exp == 0)
1778 /* We only do this if count_exp is not specified. That way "down"
1779 means to really go down (and let me know if that is
1780 impossible), but "down 9999" can be used to mean go all the way
1781 down without getting an error. */
1783 error (_("Bottom (i.e., innermost) frame selected; you cannot go down."));
1786 select_frame (frame);
1790 down_silently_command (char *count_exp, int from_tty)
1792 down_silently_base (count_exp);
1796 down_command (char *count_exp, int from_tty)
1798 down_silently_base (count_exp);
1799 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1803 return_command (char *retval_exp, int from_tty)
1805 struct symbol *thisfun;
1806 struct value *return_value = NULL;
1807 const char *query_prefix = "";
1809 thisfun = get_frame_function (get_selected_frame ("No selected frame."));
1811 /* Compute the return value. If the computation triggers an error,
1812 let it bail. If the return type can't be handled, set
1813 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1817 struct type *return_type = NULL;
1819 /* Compute the return value. Should the computation fail, this
1820 call throws an error. */
1821 return_value = parse_and_eval (retval_exp);
1823 /* Cast return value to the return type of the function. Should
1824 the cast fail, this call throws an error. */
1825 if (thisfun != NULL)
1826 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1827 if (return_type == NULL)
1828 return_type = builtin_type_int;
1829 CHECK_TYPEDEF (return_type);
1830 return_value = value_cast (return_type, return_value);
1832 /* Make sure the value is fully evaluated. It may live in the
1833 stack frame we're about to pop. */
1834 if (value_lazy (return_value))
1835 value_fetch_lazy (return_value);
1837 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1838 /* If the return-type is "void", don't try to find the
1839 return-value's location. However, do still evaluate the
1840 return expression so that, even when the expression result
1841 is discarded, side effects such as "return i++" still
1843 return_value = NULL;
1844 /* FIXME: cagney/2004-01-17: If the architecture implements both
1845 return_value and extract_returned_value_address, should allow
1846 "return" to work - don't set return_value to NULL. */
1847 else if (!gdbarch_return_value_p (current_gdbarch)
1848 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT
1849 || TYPE_CODE (return_type) == TYPE_CODE_UNION))
1851 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1852 code. Old architectures don't expect STORE_RETURN_VALUE
1853 to be called with with a small struct that needs to be
1854 stored in registers. Don't start doing it now. */
1856 A structure or union return type is not supported by this architecture.\n\
1857 If you continue, the return value that you specified will be ignored.\n";
1858 return_value = NULL;
1860 else if (using_struct_return (return_type, 0))
1863 The location at which to store the function's return value is unknown.\n\
1864 If you continue, the return value that you specified will be ignored.\n";
1865 return_value = NULL;
1869 /* Does an interactive user really want to do this? Include
1870 information, such as how well GDB can handle the return value, in
1871 the query message. */
1875 if (thisfun == NULL)
1876 confirmed = query (_("%sMake selected stack frame return now? "),
1879 confirmed = query (_("%sMake %s return now? "), query_prefix,
1880 SYMBOL_PRINT_NAME (thisfun));
1882 error (_("Not confirmed"));
1885 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1886 frame in turn, should this code just go straight to the relevant
1887 frame and pop that? */
1889 /* First discard all frames inner-to the selected frame (making the
1890 selected frame current). */
1892 struct frame_id selected_id = get_frame_id (get_selected_frame (NULL));
1893 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ())))
1895 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ())))
1896 /* Caught in the safety net, oops! We've gone way past the
1898 error (_("Problem while popping stack frames (corrupt stack?)"));
1899 frame_pop (get_current_frame ());
1903 /* Second discard the selected frame (which is now also the current
1905 frame_pop (get_current_frame ());
1907 /* Store RETURN_VAUE in the just-returned register set. */
1908 if (return_value != NULL)
1910 struct type *return_type = value_type (return_value);
1911 gdb_assert (gdbarch_return_value (current_gdbarch, return_type,
1913 == RETURN_VALUE_REGISTER_CONVENTION);
1914 gdbarch_return_value (current_gdbarch, return_type,
1915 current_regcache, NULL /*read*/,
1916 value_contents (return_value) /*write*/);
1919 /* If we are at the end of a call dummy now, pop the dummy frame
1921 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1922 frame_pop (get_current_frame ());
1924 /* If interactive, print the frame that is now current. */
1926 frame_command ("0", 1);
1928 select_frame_command ("0", 0);
1931 /* Sets the scope to input function name, provided that the
1932 function is within the current stack frame */
1934 struct function_bounds
1936 CORE_ADDR low, high;
1939 static void func_command (char *arg, int from_tty);
1941 func_command (char *arg, int from_tty)
1943 struct frame_info *fp;
1945 struct symtabs_and_lines sals;
1948 struct function_bounds *func_bounds = (struct function_bounds *) NULL;
1950 if (arg != (char *) NULL)
1953 fp = parse_frame_specification ("0");
1954 sals = decode_line_spec (arg, 1);
1955 func_bounds = (struct function_bounds *) xmalloc (
1956 sizeof (struct function_bounds) * sals.nelts);
1957 for (i = 0; (i < sals.nelts && !found); i++)
1959 if (sals.sals[i].pc == (CORE_ADDR) 0 ||
1960 find_pc_partial_function (sals.sals[i].pc,
1962 &func_bounds[i].low,
1963 &func_bounds[i].high) == 0)
1965 func_bounds[i].low =
1966 func_bounds[i].high = (CORE_ADDR) NULL;
1972 for (i = 0; (i < sals.nelts && !found); i++)
1973 found = (get_frame_pc (fp) >= func_bounds[i].low &&
1974 get_frame_pc (fp) < func_bounds[i].high);
1978 fp = find_relative_frame (fp, &level);
1981 while (!found && level == 0);
1984 xfree (func_bounds);
1987 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
1988 else if (fp != deprecated_selected_frame)
1989 select_and_print_frame (fp);
1992 /* Gets the language of the current frame. */
1995 get_frame_language (void)
1998 enum language flang; /* The language of the current frame */
2000 if (deprecated_selected_frame)
2002 /* We determine the current frame language by looking up its
2003 associated symtab. To retrieve this symtab, we use the frame PC.
2004 However we cannot use the frame pc as is, because it usually points
2005 to the instruction following the "call", which is sometimes the first
2006 instruction of another function. So we rely on
2007 get_frame_address_in_block(), it provides us with a PC which is
2008 guaranteed to be inside the frame's code block. */
2009 s = find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame));
2011 flang = s->language;
2013 flang = language_unknown;
2016 flang = language_unknown;
2022 _initialize_stack (void)
2025 backtrace_limit = 30;
2028 add_com ("return", class_stack, return_command, _("\
2029 Make selected stack frame return to its caller.\n\
2030 Control remains in the debugger, but when you continue\n\
2031 execution will resume in the frame above the one now selected.\n\
2032 If an argument is given, it is an expression for the value to return."));
2034 add_com ("up", class_stack, up_command, _("\
2035 Select and print stack frame that called this one.\n\
2036 An argument says how many frames up to go."));
2037 add_com ("up-silently", class_support, up_silently_command, _("\
2038 Same as the `up' command, but does not print anything.\n\
2039 This is useful in command scripts."));
2041 add_com ("down", class_stack, down_command, _("\
2042 Select and print stack frame called by this one.\n\
2043 An argument says how many frames down to go."));
2044 add_com_alias ("do", "down", class_stack, 1);
2045 add_com_alias ("dow", "down", class_stack, 1);
2046 add_com ("down-silently", class_support, down_silently_command, _("\
2047 Same as the `down' command, but does not print anything.\n\
2048 This is useful in command scripts."));
2050 add_com ("frame", class_stack, frame_command, _("\
2051 Select and print a stack frame.\n\
2052 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2053 An argument specifies the frame to select.\n\
2054 It can be a stack frame number or the address of the frame.\n\
2055 With argument, nothing is printed if input is coming from\n\
2056 a command file or a user-defined command."));
2058 add_com_alias ("f", "frame", class_stack, 1);
2062 add_com ("L", class_stack, current_frame_command,
2063 _("Print the current stack frame.\n"));
2064 add_com_alias ("V", "frame", class_stack, 1);
2066 add_com ("select-frame", class_stack, select_frame_command, _("\
2067 Select a stack frame without printing anything.\n\
2068 An argument specifies the frame to select.\n\
2069 It can be a stack frame number or the address of the frame.\n"));
2071 add_com ("backtrace", class_stack, backtrace_command, _("\
2072 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2073 With a negative argument, print outermost -COUNT frames.\n\
2074 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2075 add_com_alias ("bt", "backtrace", class_stack, 0);
2078 add_com_alias ("t", "backtrace", class_stack, 0);
2079 add_com ("T", class_stack, backtrace_full_command, _("\
2080 Print backtrace of all stack frames, or innermost COUNT frames \n\
2081 and the values of the local variables.\n\
2082 With a negative argument, print outermost -COUNT frames.\n\
2083 Usage: T <count>\n"));
2086 add_com_alias ("where", "backtrace", class_alias, 0);
2087 add_info ("stack", backtrace_command,
2088 _("Backtrace of the stack, or innermost COUNT frames."));
2089 add_info_alias ("s", "stack", 1);
2090 add_info ("frame", frame_info,
2091 _("All about selected stack frame, or frame at ADDR."));
2092 add_info_alias ("f", "frame", 1);
2093 add_info ("locals", locals_info,
2094 _("Local variables of current stack frame."));
2095 add_info ("args", args_info,
2096 _("Argument variables of current stack frame."));
2098 add_com ("l", class_info, args_plus_locals_info,
2099 _("Argument and local variables of current stack frame."));
2102 add_com ("func", class_stack, func_command, _("\
2103 Select the stack frame that contains <func>.\n\
2104 Usage: func <name>\n"));
2106 add_info ("catch", catch_info,
2107 _("Exceptions that can be caught in the current stack frame."));
2110 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, _(\
2111 "Specify maximum number of frames for \"backtrace\" to print by default."),
2113 add_info ("backtrace-limit", backtrace_limit_info, _("\
2114 The maximum number of frames for \"backtrace\" to print by default."));