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"
50 /* Prototypes for exported functions. */
52 void args_info (char *, int);
54 void locals_info (char *, int);
56 void (*deprecated_selected_frame_level_changed_hook) (int);
58 void _initialize_stack (void);
60 /* Prototypes for local functions. */
62 static void down_command (char *, int);
64 static void down_silently_base (char *);
66 static void down_silently_command (char *, int);
68 static void up_command (char *, int);
70 static void up_silently_base (char *);
72 static void up_silently_command (char *, int);
74 void frame_command (char *, int);
76 static void current_frame_command (char *, int);
78 static void print_frame_arg_vars (struct frame_info *, struct ui_file *);
80 static void catch_info (char *, int);
82 static void args_plus_locals_info (char *, int);
84 static void print_frame_label_vars (struct frame_info *, int,
87 static void print_frame_local_vars (struct frame_info *, int,
90 static int print_block_frame_labels (struct block *, int *,
93 static int print_block_frame_locals (struct block *,
98 static void print_frame (struct frame_info *fi,
100 enum print_what print_what,
102 struct symtab_and_line sal);
104 static void set_current_sal_from_frame (struct frame_info *, int);
106 static void backtrace_command (char *, int);
108 static void frame_info (char *, int);
110 extern int addressprint; /* Print addresses, or stay symbolic only? */
112 /* Zero means do things normally; we are interacting directly with the
113 user. One means print the full filename and linenumber when a
114 frame is printed, and do so in a format emacs18/emacs19.22 can
115 parse. Two means print similar annotations, but in many more
116 cases and in a slightly different syntax. */
118 int annotation_level = 0;
121 struct print_stack_frame_args
123 struct frame_info *fi;
125 enum print_what print_what;
129 /* Show or print the frame arguments.
130 Pass the args the way catch_errors wants them. */
132 print_stack_frame_stub (void *args)
134 struct print_stack_frame_args *p = args;
135 int center = (p->print_what == SRC_LINE
136 || p->print_what == SRC_AND_LOC);
138 print_frame_info (p->fi, p->print_level, p->print_what, p->print_args);
139 set_current_sal_from_frame (p->fi, center);
143 /* Show or print a stack frame FI briefly. The output is format
144 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
145 relative level, function name, argument list, and file name and
146 line number. If the frame's PC is not at the beginning of the
147 source line, the actual PC is printed at the beginning. */
150 print_stack_frame (struct frame_info *fi, int print_level,
151 enum print_what print_what)
153 struct print_stack_frame_args args;
156 args.print_level = print_level;
157 args.print_what = print_what;
160 catch_errors (print_stack_frame_stub, (char *) &args, "", RETURN_MASK_ALL);
163 struct print_args_args
166 struct frame_info *fi;
167 struct ui_file *stream;
170 static int print_args_stub (void *);
172 /* Print nameless args on STREAM.
173 FI is the frameinfo for this frame, START is the offset
174 of the first nameless arg, and NUM is the number of nameless args to
175 print. FIRST is nonzero if this is the first argument (not just
176 the first nameless arg). */
179 print_frame_nameless_args (struct frame_info *fi, long start, int num,
180 int first, struct ui_file *stream)
186 for (i = 0; i < num; i++)
189 argsaddr = get_frame_args_address (fi);
192 arg_value = read_memory_integer (argsaddr + start, sizeof (int));
194 fprintf_filtered (stream, ", ");
195 fprintf_filtered (stream, "%ld", arg_value);
197 start += sizeof (int);
201 /* Print the arguments of a stack frame, given the function FUNC
202 running in that frame (as a symbol), the info on the frame,
203 and the number of args according to the stack frame (or -1 if unknown). */
205 /* References here and elsewhere to "number of args according to the
206 stack frame" appear in all cases to refer to "number of ints of args
207 according to the stack frame". At least for VAX, i386, isi. */
210 print_frame_args (struct symbol *func, struct frame_info *fi, int num,
211 struct ui_file *stream)
213 struct block *b = NULL;
215 struct dict_iterator iter;
218 /* Offset of next stack argument beyond the one we have seen that is
219 at the highest offset.
220 -1 if we haven't come to a stack argument yet. */
221 long highest_offset = -1;
223 /* Number of ints of arguments that we have printed so far. */
224 int args_printed = 0;
225 struct cleanup *old_chain, *list_chain;
226 struct ui_stream *stb;
228 stb = ui_out_stream_new (uiout);
229 old_chain = make_cleanup_ui_out_stream_delete (stb);
233 b = SYMBOL_BLOCK_VALUE (func);
235 ALL_BLOCK_SYMBOLS (b, iter, sym)
239 /* Keep track of the highest stack argument offset seen, and
240 skip over any kinds of symbols we don't care about. */
242 switch (SYMBOL_CLASS (sym))
247 long current_offset = SYMBOL_VALUE (sym);
248 arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
250 /* Compute address of next argument by adding the size of
251 this argument and rounding to an int boundary. */
253 ((current_offset + arg_size + sizeof (int) - 1)
254 & ~(sizeof (int) - 1));
256 /* If this is the highest offset seen yet, set highest_offset. */
257 if (highest_offset == -1
258 || (current_offset > highest_offset))
259 highest_offset = current_offset;
261 /* Add the number of ints we're about to print to args_printed. */
262 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
265 /* We care about types of symbols, but don't need to keep track of
266 stack offsets in them. */
268 case LOC_REGPARM_ADDR:
270 case LOC_BASEREG_ARG:
271 case LOC_COMPUTED_ARG:
274 /* Other types of symbols we just skip over. */
279 /* We have to look up the symbol because arguments can have
280 two entries (one a parameter, one a local) and the one we
281 want is the local, which lookup_symbol will find for us.
282 This includes gcc1 (not gcc2) on the sparc when passing a
283 small structure and gcc2 when the argument type is float
284 and it is passed as a double and converted to float by
285 the prologue (in the latter case the type of the LOC_ARG
286 symbol is double and the type of the LOC_LOCAL symbol is
288 /* But if the parameter name is null, don't try it.
289 Null parameter names occur on the RS/6000, for traceback tables.
290 FIXME, should we even print them? */
292 if (*DEPRECATED_SYMBOL_NAME (sym))
296 (DEPRECATED_SYMBOL_NAME (sym),
297 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
298 if (SYMBOL_CLASS (nsym) == LOC_REGISTER)
300 /* There is a LOC_ARG/LOC_REGISTER pair. This means that
301 it was passed on the stack and loaded into a register,
302 or passed in a register and stored in a stack slot.
303 GDB 3.x used the LOC_ARG; GDB 4.0-4.11 used the LOC_REGISTER.
305 Reasons for using the LOC_ARG:
306 (1) because find_saved_registers may be slow for remote
308 (2) because registers are often re-used and stack slots
309 rarely (never?) are. Therefore using the stack slot is
310 much less likely to print garbage.
312 Reasons why we might want to use the LOC_REGISTER:
313 (1) So that the backtrace prints the same value as
314 "print foo". I see no compelling reason why this needs
315 to be the case; having the backtrace print the value which
316 was passed in, and "print foo" print the value as modified
317 within the called function, makes perfect sense to me.
319 Additional note: It might be nice if "info args" displayed
321 One more note: There is a case with sparc structure passing
322 where we need to use the LOC_REGISTER, but this is dealt with
323 by creating a single LOC_REGPARM in symbol reading. */
325 /* Leave sym (the LOC_ARG) alone. */
332 /* Print the current arg. */
334 ui_out_text (uiout, ", ");
335 ui_out_wrap_hint (uiout, " ");
337 annotate_arg_begin ();
339 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
340 fprintf_symbol_filtered (stb->stream, SYMBOL_PRINT_NAME (sym),
341 SYMBOL_LANGUAGE (sym), DMGL_PARAMS | DMGL_ANSI);
342 ui_out_field_stream (uiout, "name", stb);
343 annotate_arg_name_end ();
344 ui_out_text (uiout, "=");
346 /* Avoid value_print because it will deref ref parameters. We just
347 want to print their addresses. Print ??? for args whose address
348 we do not know. We pass 2 as "recurse" to val_print because our
349 standard indentation here is 4 spaces, and val_print indents
350 2 for each recurse. */
351 val = read_var_value (sym, fi);
353 annotate_arg_value (val == NULL ? NULL : value_type (val));
357 common_val_print (val, stb->stream, 0, 0, 2, Val_no_prettyprint);
358 ui_out_field_stream (uiout, "value", stb);
361 ui_out_text (uiout, "???");
363 /* Invoke ui_out_tuple_end. */
364 do_cleanups (list_chain);
372 /* Don't print nameless args in situations where we don't know
373 enough about the stack to find them. */
378 if (highest_offset == -1)
379 start = FRAME_ARGS_SKIP;
381 start = highest_offset;
383 print_frame_nameless_args (fi, start, num - args_printed,
386 do_cleanups (old_chain);
389 /* Pass the args the way catch_errors wants them. */
392 print_args_stub (void *args)
395 struct print_args_args *p = (struct print_args_args *) args;
397 if (FRAME_NUM_ARGS_P ())
399 numargs = FRAME_NUM_ARGS (p->fi);
400 gdb_assert (numargs >= 0);
404 print_frame_args (p->func, p->fi, numargs, p->stream);
408 /* Set the current source and line to the location of the given
409 frame, if possible. When CENTER is true, adjust so the
410 relevant line is in the center of the next 'list'. */
413 set_current_sal_from_frame (struct frame_info *fi, int center)
415 struct symtab_and_line sal;
417 find_frame_sal (fi, &sal);
421 sal.line = max (sal.line - get_lines_to_list () / 2, 1);
422 set_current_source_symtab_and_line (&sal);
426 /* Print information about a frame for frame "fi" at level "level".
427 Used in "where" output, also used to emit breakpoint or step
429 LEVEL is the level of the frame, or -1 if it is the
430 innermost frame but we don't want to print the level.
431 The meaning of the SOURCE argument is:
432 SRC_LINE: Print only source line
433 LOCATION: Print only location
434 LOC_AND_SRC: Print location and source line. */
437 print_frame_info (struct frame_info *fi, int print_level,
438 enum print_what print_what, int print_args)
440 struct symtab_and_line sal;
444 if (get_frame_type (fi) == DUMMY_FRAME
445 || get_frame_type (fi) == SIGTRAMP_FRAME)
447 struct cleanup *uiout_cleanup
448 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
450 annotate_frame_begin (print_level ? frame_relative_level (fi) : 0,
453 /* Do this regardless of SOURCE because we don't have any source
454 to list for this frame. */
457 ui_out_text (uiout, "#");
458 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
459 frame_relative_level (fi));
461 if (ui_out_is_mi_like_p (uiout))
463 annotate_frame_address ();
464 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
465 annotate_frame_address_end ();
468 if (get_frame_type (fi) == DUMMY_FRAME)
470 annotate_function_call ();
471 ui_out_field_string (uiout, "func", "<function called from gdb>");
473 else if (get_frame_type (fi) == SIGTRAMP_FRAME)
475 annotate_signal_handler_caller ();
476 ui_out_field_string (uiout, "func", "<signal handler called>");
478 ui_out_text (uiout, "\n");
479 annotate_frame_end ();
481 do_cleanups (uiout_cleanup);
485 /* If fi is not the innermost frame, that normally means that fi->pc
486 points to *after* the call instruction, and we want to get the
487 line containing the call, never the next line. But if the next
488 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
489 was not entered as the result of a call, and we want to get the
490 line containing fi->pc. */
491 find_frame_sal (fi, &sal);
493 location_print = (print_what == LOCATION
494 || print_what == LOC_AND_ADDRESS
495 || print_what == SRC_AND_LOC);
497 if (location_print || !sal.symtab)
498 print_frame (fi, print_level, print_what, print_args, sal);
500 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
502 if (source_print && sal.symtab)
505 int mid_statement = ((print_what == SRC_LINE)
506 && (get_frame_pc (fi) != sal.pc));
508 if (annotation_level)
509 done = identify_source_line (sal.symtab, sal.line, mid_statement,
513 if (deprecated_print_frame_info_listing_hook)
514 deprecated_print_frame_info_listing_hook (sal.symtab,
519 /* We used to do this earlier, but that is clearly
520 wrong. This function is used by many different
521 parts of gdb, including normal_stop in infrun.c,
522 which uses this to print out the current PC
523 when we stepi/nexti into the middle of a source
524 line. Only the command line really wants this
525 behavior. Other UIs probably would like the
526 ability to decide for themselves if it is desired. */
527 if (addressprint && mid_statement)
529 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
530 ui_out_text (uiout, "\t");
533 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
538 if (print_what != LOCATION)
539 set_default_breakpoint (1, get_frame_pc (fi), sal.symtab, sal.line);
541 annotate_frame_end ();
543 gdb_flush (gdb_stdout);
547 print_frame (struct frame_info *fi,
549 enum print_what print_what,
551 struct symtab_and_line sal)
555 enum language funlang = language_unknown;
556 struct ui_stream *stb;
557 struct cleanup *old_chain;
558 struct cleanup *list_chain;
560 stb = ui_out_stream_new (uiout);
561 old_chain = make_cleanup_ui_out_stream_delete (stb);
563 func = find_pc_function (get_frame_address_in_block (fi));
566 /* In certain pathological cases, the symtabs give the wrong
567 function (when we are in the first function in a file which
568 is compiled without debugging symbols, the previous function
569 is compiled with debugging symbols, and the "foo.o" symbol
570 that is supposed to tell us where the file with debugging symbols
571 ends has been truncated by ar because it is longer than 15
572 characters). This also occurs if the user uses asm() to create
573 a function but not stabs for it (in a file compiled -g).
575 So look in the minimal symbol tables as well, and if it comes
576 up with a larger address for the function use that instead.
577 I don't think this can ever cause any problems; there shouldn't
578 be any minimal symbols in the middle of a function; if this is
579 ever changed many parts of GDB will need to be changed (and we'll
580 create a find_pc_minimal_function or some such). */
582 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
584 && (SYMBOL_VALUE_ADDRESS (msymbol)
585 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
587 /* We also don't know anything about the function besides
588 its address and name. */
590 funname = DEPRECATED_SYMBOL_NAME (msymbol);
591 funlang = SYMBOL_LANGUAGE (msymbol);
595 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
596 demangled name that we already have stored in the symbol
597 table, but we stored a version with DMGL_PARAMS turned
598 on, and here we don't want to display parameters. So call
599 the demangler again, with DMGL_ANSI only. (Yes, I know
600 that printf_symbol_filtered() will again try to demangle
601 the name on the fly, but the issue is that if
602 cplus_demangle() fails here, it'll fail there too. So we
603 want to catch the failure ("demangled==NULL" case below)
604 here, while we still have our hands on the function
607 funname = DEPRECATED_SYMBOL_NAME (func);
608 funlang = SYMBOL_LANGUAGE (func);
609 if (funlang == language_cplus)
611 demangled = cplus_demangle (funname, DMGL_ANSI);
612 if (demangled == NULL)
613 /* If the demangler fails, try the demangled name from
614 the symbol table. This'll have parameters, but
615 that's preferable to diplaying a mangled name. */
616 funname = SYMBOL_PRINT_NAME (func);
622 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
625 funname = DEPRECATED_SYMBOL_NAME (msymbol);
626 funlang = SYMBOL_LANGUAGE (msymbol);
630 annotate_frame_begin (print_level ? frame_relative_level (fi) : 0,
633 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
637 ui_out_text (uiout, "#");
638 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
639 frame_relative_level (fi));
642 if (get_frame_pc (fi) != sal.pc
644 || print_what == LOC_AND_ADDRESS)
646 annotate_frame_address ();
647 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
648 annotate_frame_address_end ();
649 ui_out_text (uiout, " in ");
651 annotate_frame_function_name ();
652 fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang,
654 ui_out_field_stream (uiout, "func", stb);
655 ui_out_wrap_hint (uiout, " ");
656 annotate_frame_args ();
658 ui_out_text (uiout, " (");
661 struct print_args_args args;
662 struct cleanup *args_list_chain;
665 args.stream = gdb_stdout;
666 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
667 catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL);
668 /* FIXME: args must be a list. If one argument is a string it will
669 have " that will not be properly escaped. */
670 /* Invoke ui_out_tuple_end. */
671 do_cleanups (args_list_chain);
674 ui_out_text (uiout, ")");
675 if (sal.symtab && sal.symtab->filename)
677 annotate_frame_source_begin ();
678 ui_out_wrap_hint (uiout, " ");
679 ui_out_text (uiout, " at ");
680 annotate_frame_source_file ();
681 ui_out_field_string (uiout, "file", sal.symtab->filename);
682 annotate_frame_source_file_end ();
683 ui_out_text (uiout, ":");
684 annotate_frame_source_line ();
685 ui_out_field_int (uiout, "line", sal.line);
686 annotate_frame_source_end ();
690 if (!funname || (!sal.symtab || !sal.symtab->filename))
692 char *lib = PC_SOLIB (get_frame_pc (fi));
695 annotate_frame_where ();
696 ui_out_wrap_hint (uiout, " ");
697 ui_out_text (uiout, " from ");
698 ui_out_field_string (uiout, "from", lib);
701 #endif /* PC_SOLIB */
703 /* do_cleanups will call ui_out_tuple_end() for us. */
704 do_cleanups (list_chain);
705 ui_out_text (uiout, "\n");
706 do_cleanups (old_chain);
709 /* Show the frame info. If this is the tui, it will be shown in
710 the source display otherwise, nothing is done */
712 show_stack_frame (struct frame_info *fi)
717 /* Read a frame specification in whatever the appropriate format is.
718 Call error() if the specification is in any way invalid (i.e. this
719 function never returns NULL). When SEPECTED_P is non-NULL set it's
720 target to indicate that the default selected frame was used. */
722 static struct frame_info *
723 parse_frame_specification_1 (const char *frame_exp, const char *message,
724 int *selected_frame_p)
727 struct value *args[4];
728 CORE_ADDR addrs[ARRAY_SIZE (args)];
730 if (frame_exp == NULL)
735 struct cleanup *tmp_cleanup;
741 struct cleanup *cleanup;
744 /* Skip leading white space, bail of EOL. */
745 while (isspace (*frame_exp))
750 /* Parse the argument, extract it, save it. */
754 addr_string = savestring (frame_exp, p - frame_exp);
756 cleanup = make_cleanup (xfree, addr_string);
758 /* NOTE: Parse and evaluate expression, but do not use
759 functions such as parse_and_eval_long or
760 parse_and_eval_address to also extract the value.
761 Instead value_as_long and value_as_address are used.
762 This avoids problems with expressions that contain
764 if (numargs >= ARRAY_SIZE (args))
765 error (_("Too many args in frame specification"));
766 args[numargs++] = parse_and_eval (addr_string);
768 do_cleanups (cleanup);
772 /* If no args, default to the selected frame. */
775 if (selected_frame_p != NULL)
776 (*selected_frame_p) = 1;
777 return get_selected_frame (message);
780 /* None of the remaining use the selected frame. */
781 if (selected_frame_p != NULL)
782 (*selected_frame_p) = 0;
784 /* Assume the single arg[0] is an integer, and try using that to
785 select a frame relative to current. */
788 struct frame_info *fid;
789 int level = value_as_long (args[0]);
790 fid = find_relative_frame (get_current_frame (), &level);
792 /* find_relative_frame was successful */
796 /* Convert each value into a corresponding address. */
799 for (i = 0; i < numargs; i++)
800 addrs[i] = value_as_address (args[0]);
803 /* Assume that the single arg[0] is an address, use that to identify
804 a frame with a matching ID. Should this also accept stack/pc or
808 struct frame_id id = frame_id_build_wild (addrs[0]);
809 struct frame_info *fid;
811 /* If SETUP_ARBITRARY_FRAME is defined, then frame
812 specifications take at least 2 addresses. It is important to
813 detect this case here so that "frame 100" does not give a
814 confusing error message like "frame specification requires
815 two addresses". This of course does not solve the "frame
816 100" problem for machines on which a frame specification can
817 be made with one address. To solve that, we need a new
818 syntax for a specifying a frame by address. I think the
819 cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for two
820 args, etc.), but people might think that is too much typing,
821 so I guess *0x23,0x45 would be a possible alternative (commas
822 really should be used instead of spaces to delimit; using
823 spaces normally works in an expression). */
824 #ifdef SETUP_ARBITRARY_FRAME
825 error (_("No frame %s"), paddr_d (addrs[0]));
827 /* If (s)he specifies the frame with an address, he deserves
828 what (s)he gets. Still, give the highest one that matches.
829 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
831 for (fid = get_current_frame ();
833 fid = get_prev_frame (fid))
835 if (frame_id_eq (id, get_frame_id (fid)))
837 while (frame_id_eq (id, frame_unwind_id (fid)))
838 fid = get_prev_frame (fid);
844 /* We couldn't identify the frame as an existing frame, but
845 perhaps we can create one with a single argument. */
847 return create_new_frame (addrs[0], 0);
848 else if (numargs == 2)
849 return create_new_frame (addrs[0], addrs[1]);
851 error (_("Too many args in frame specification"));
855 parse_frame_specification (char *frame_exp)
857 return parse_frame_specification_1 (frame_exp, NULL, NULL);
860 /* Print verbosely the selected frame or the frame at address ADDR.
861 This means absolutely all information in the frame is printed. */
864 frame_info (char *addr_exp, int from_tty)
866 struct frame_info *fi;
867 struct symtab_and_line sal;
870 struct frame_info *calling_frame_info;
871 int i, count, numregs;
873 enum language funlang = language_unknown;
874 const char *pc_regname;
875 int selected_frame_p;
877 fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
879 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
880 is not a good name. */
882 /* OK, this is weird. The PC_REGNUM hardware register's value can
883 easily not match that of the internal value returned by
885 pc_regname = REGISTER_NAME (PC_REGNUM);
887 /* But then, this is weird to. Even without PC_REGNUM, an
888 architectures will often have a hardware register called "pc",
889 and that register's value, again, can easily not match
893 find_frame_sal (fi, &sal);
894 func = get_frame_function (fi);
895 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
897 s = find_pc_symtab (get_frame_pc (fi));
900 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
901 * the demangled name that we already have stored in
902 * the symbol table, but we stored a version with
903 * DMGL_PARAMS turned on, and here we don't want
904 * to display parameters. So call the demangler again,
905 * with DMGL_ANSI only. RT
906 * (Yes, I know that printf_symbol_filtered() will
907 * again try to demangle the name on the fly, but
908 * the issue is that if cplus_demangle() fails here,
909 * it'll fail there too. So we want to catch the failure
910 * ("demangled==NULL" case below) here, while we still
911 * have our hands on the function symbol.)
914 funname = DEPRECATED_SYMBOL_NAME (func);
915 funlang = SYMBOL_LANGUAGE (func);
916 if (funlang == language_cplus)
918 demangled = cplus_demangle (funname, DMGL_ANSI);
919 /* If the demangler fails, try the demangled name
920 * from the symbol table. This'll have parameters,
921 * but that's preferable to diplaying a mangled name.
923 if (demangled == NULL)
924 funname = SYMBOL_PRINT_NAME (func);
929 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
932 funname = DEPRECATED_SYMBOL_NAME (msymbol);
933 funlang = SYMBOL_LANGUAGE (msymbol);
936 calling_frame_info = get_prev_frame (fi);
938 if (selected_frame_p && frame_relative_level (fi) >= 0)
940 printf_filtered (_("Stack level %d, frame at "),
941 frame_relative_level (fi));
942 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
943 printf_filtered (":\n");
947 printf_filtered (_("Stack frame at "));
948 deprecated_print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
949 printf_filtered (":\n");
951 printf_filtered (" %s = ", pc_regname);
952 deprecated_print_address_numeric (get_frame_pc (fi), 1, gdb_stdout);
957 printf_filtered (" in ");
958 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
959 DMGL_ANSI | DMGL_PARAMS);
963 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
964 puts_filtered ("; ");
966 printf_filtered ("saved %s ", pc_regname);
967 deprecated_print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout);
968 printf_filtered ("\n");
970 if (calling_frame_info)
972 printf_filtered (" called by frame at ");
973 deprecated_print_address_numeric (get_frame_base (calling_frame_info),
976 if (get_next_frame (fi) && calling_frame_info)
979 if (get_next_frame (fi))
981 printf_filtered (" caller of frame at ");
982 deprecated_print_address_numeric (get_frame_base (get_next_frame (fi)), 1,
985 if (get_next_frame (fi) || calling_frame_info)
986 puts_filtered ("\n");
988 printf_filtered (" source language %s.\n",
989 language_str (s->language));
992 /* Address of the argument list for this frame, or 0. */
993 CORE_ADDR arg_list = get_frame_args_address (fi);
994 /* Number of args for this frame, or -1 if unknown. */
998 printf_filtered (" Arglist at unknown address.\n");
1001 printf_filtered (" Arglist at ");
1002 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
1003 printf_filtered (",");
1005 if (!FRAME_NUM_ARGS_P ())
1008 puts_filtered (" args: ");
1012 numargs = FRAME_NUM_ARGS (fi);
1013 gdb_assert (numargs >= 0);
1015 puts_filtered (" no args.");
1016 else if (numargs == 1)
1017 puts_filtered (" 1 arg: ");
1019 printf_filtered (" %d args: ", numargs);
1021 print_frame_args (func, fi, numargs, gdb_stdout);
1022 puts_filtered ("\n");
1026 /* Address of the local variables for this frame, or 0. */
1027 CORE_ADDR arg_list = get_frame_locals_address (fi);
1030 printf_filtered (" Locals at unknown address,");
1033 printf_filtered (" Locals at ");
1034 deprecated_print_address_numeric (arg_list, 1, gdb_stdout);
1035 printf_filtered (",");
1039 /* Print as much information as possible on the location of all the
1042 enum lval_type lval;
1050 /* The sp is special; what's displayed isn't the save address, but
1051 the value of the previous frame's sp. This is a legacy thing,
1052 at one stage the frame cached the previous frame's SP instead
1053 of its address, hence it was easiest to just display the cached
1057 /* Find out the location of the saved stack pointer with out
1058 actually evaluating it. */
1059 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1061 if (!optimized && lval == not_lval)
1063 char value[MAX_REGISTER_SIZE];
1065 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1067 /* NOTE: cagney/2003-05-22: This is assuming that the
1068 stack pointer was packed as an unsigned integer. That
1069 may or may not be valid. */
1070 sp = extract_unsigned_integer (value, register_size (current_gdbarch, SP_REGNUM));
1071 printf_filtered (" Previous frame's sp is ");
1072 deprecated_print_address_numeric (sp, 1, gdb_stdout);
1073 printf_filtered ("\n");
1076 else if (!optimized && lval == lval_memory)
1078 printf_filtered (" Previous frame's sp at ");
1079 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1080 printf_filtered ("\n");
1083 else if (!optimized && lval == lval_register)
1085 printf_filtered (" Previous frame's sp in %s\n",
1086 REGISTER_NAME (realnum));
1089 /* else keep quiet. */
1093 numregs = NUM_REGS + NUM_PSEUDO_REGS;
1094 for (i = 0; i < numregs; i++)
1096 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup))
1098 /* Find out the location of the saved register without
1099 fetching the corresponding value. */
1100 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1102 /* For moment, only display registers that were saved on the
1104 if (!optimized && lval == lval_memory)
1107 puts_filtered (" Saved registers:\n ");
1109 puts_filtered (",");
1111 printf_filtered (" %s at ", REGISTER_NAME (i));
1112 deprecated_print_address_numeric (addr, 1, gdb_stdout);
1116 if (count || need_nl)
1117 puts_filtered ("\n");
1121 /* Print briefly all stack frames or just the innermost COUNT frames. */
1123 static void backtrace_command_1 (char *count_exp, int show_locals,
1126 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1128 struct frame_info *fi;
1131 struct frame_info *trailing;
1134 if (!target_has_stack)
1135 error (_("No stack."));
1137 /* The following code must do two things. First, it must
1138 set the variable TRAILING to the frame from which we should start
1139 printing. Second, it must set the variable count to the number
1140 of frames which we should print, or -1 if all of them. */
1141 trailing = get_current_frame ();
1143 /* The target can be in a state where there is no valid frames
1144 (e.g., just connected). */
1145 if (trailing == NULL)
1146 error (_("No stack."));
1151 count = parse_and_eval_long (count_exp);
1154 struct frame_info *current;
1159 while (current && count--)
1162 current = get_prev_frame (current);
1165 /* Will stop when CURRENT reaches the top of the stack. TRAILING
1166 will be COUNT below it. */
1170 trailing = get_prev_frame (trailing);
1171 current = get_prev_frame (current);
1183 struct partial_symtab *ps;
1185 /* Read in symbols for all of the frames. Need to do this in
1186 a separate pass so that "Reading in symbols for xxx" messages
1187 don't screw up the appearance of the backtrace. Also
1188 if people have strong opinions against reading symbols for
1189 backtrace this may have to be an option. */
1193 fi = get_prev_frame (fi))
1196 ps = find_pc_psymtab (get_frame_address_in_block (fi));
1198 PSYMTAB_TO_SYMTAB (ps); /* Force syms to come in */
1202 for (i = 0, fi = trailing;
1204 i++, fi = get_prev_frame (fi))
1208 /* Don't use print_stack_frame; if an error() occurs it probably
1209 means further attempts to backtrace would fail (on the other
1210 hand, perhaps the code does or could be fixed to make sure
1211 the frame->prev field gets set to NULL in that case). */
1212 print_frame_info (fi, 1, LOCATION, 1);
1214 print_frame_local_vars (fi, 1, gdb_stdout);
1217 /* If we've stopped before the end, mention that. */
1219 printf_filtered (_("(More stack frames follow...)\n"));
1222 struct backtrace_command_args
1229 /* Stub to call backtrace_command_1 by way of an error catcher. */
1231 backtrace_command_stub (void *data)
1233 struct backtrace_command_args *args = (struct backtrace_command_args *)data;
1234 backtrace_command_1 (args->count_exp, args->show_locals, args->from_tty);
1239 backtrace_command (char *arg, int from_tty)
1241 struct cleanup *old_chain = (struct cleanup *) NULL;
1242 char **argv = (char **) NULL;
1243 int argIndicatingFullTrace = (-1), totArgLen = 0, argc = 0;
1245 struct backtrace_command_args btargs;
1247 if (arg != (char *) NULL)
1251 argv = buildargv (arg);
1252 old_chain = make_cleanup_freeargv (argv);
1254 for (i = 0; (argv[i] != (char *) NULL); i++)
1258 for (j = 0; (j < strlen (argv[i])); j++)
1259 argv[i][j] = tolower (argv[i][j]);
1261 if (argIndicatingFullTrace < 0 && subset_compare (argv[i], "full"))
1262 argIndicatingFullTrace = argc;
1266 totArgLen += strlen (argv[i]);
1270 if (argIndicatingFullTrace >= 0)
1274 argPtr = (char *) xmalloc (totArgLen + 1);
1279 memset (argPtr, 0, totArgLen + 1);
1280 for (i = 0; (i < (argc + 1)); i++)
1282 if (i != argIndicatingFullTrace)
1284 strcat (argPtr, argv[i]);
1285 strcat (argPtr, " ");
1291 argPtr = (char *) NULL;
1295 btargs.count_exp = argPtr;
1296 btargs.show_locals = (argIndicatingFullTrace >= 0);
1297 btargs.from_tty = from_tty;
1298 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR);
1300 if (argIndicatingFullTrace >= 0 && totArgLen > 0)
1304 do_cleanups (old_chain);
1307 static void backtrace_full_command (char *arg, int from_tty);
1309 backtrace_full_command (char *arg, int from_tty)
1311 struct backtrace_command_args btargs;
1312 btargs.count_exp = arg;
1313 btargs.show_locals = 1;
1314 btargs.from_tty = from_tty;
1315 catch_errors (backtrace_command_stub, (char *)&btargs, "", RETURN_MASK_ERROR);
1319 /* Print the local variables of a block B active in FRAME.
1320 Return 1 if any variables were printed; 0 otherwise. */
1323 print_block_frame_locals (struct block *b, struct frame_info *fi,
1324 int num_tabs, struct ui_file *stream)
1326 struct dict_iterator iter;
1329 int values_printed = 0;
1331 ALL_BLOCK_SYMBOLS (b, iter, sym)
1333 switch (SYMBOL_CLASS (sym))
1341 for (j = 0; j < num_tabs; j++)
1342 fputs_filtered ("\t", stream);
1343 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1344 fputs_filtered (" = ", stream);
1345 print_variable_value (sym, fi, stream);
1346 fprintf_filtered (stream, "\n");
1350 /* Ignore symbols which are not locals. */
1354 return values_printed;
1357 /* Same, but print labels. */
1360 print_block_frame_labels (struct block *b, int *have_default,
1361 struct ui_file *stream)
1363 struct dict_iterator iter;
1365 int values_printed = 0;
1367 ALL_BLOCK_SYMBOLS (b, iter, sym)
1369 if (strcmp (DEPRECATED_SYMBOL_NAME (sym), "default") == 0)
1375 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1377 struct symtab_and_line sal;
1378 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1380 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1383 fprintf_filtered (stream, " ");
1384 deprecated_print_address_numeric (SYMBOL_VALUE_ADDRESS (sym), 1, stream);
1386 fprintf_filtered (stream, " in file %s, line %d\n",
1387 sal.symtab->filename, sal.line);
1390 return values_printed;
1393 /* Print on STREAM all the local variables in frame FRAME,
1394 including all the blocks active in that frame
1397 Returns 1 if the job was done,
1398 or 0 if nothing was printed because we have no info
1399 on the function running in FRAME. */
1402 print_frame_local_vars (struct frame_info *fi, int num_tabs,
1403 struct ui_file *stream)
1405 struct block *block = get_frame_block (fi, 0);
1406 int values_printed = 0;
1410 fprintf_filtered (stream, "No symbol table info available.\n");
1416 if (print_block_frame_locals (block, fi, num_tabs, stream))
1418 /* After handling the function's top-level block, stop.
1419 Don't continue to its superblock, the block of
1420 per-file symbols. */
1421 if (BLOCK_FUNCTION (block))
1423 block = BLOCK_SUPERBLOCK (block);
1426 if (!values_printed)
1428 fprintf_filtered (stream, "No locals.\n");
1432 /* Same, but print labels. */
1435 print_frame_label_vars (struct frame_info *fi, int this_level_only,
1436 struct ui_file *stream)
1438 struct blockvector *bl;
1439 struct block *block = get_frame_block (fi, 0);
1440 int values_printed = 0;
1441 int index, have_default = 0;
1442 char *blocks_printed;
1443 CORE_ADDR pc = get_frame_pc (fi);
1447 fprintf_filtered (stream, "No symbol table info available.\n");
1451 bl = blockvector_for_pc (BLOCK_END (block) - 4, &index);
1452 blocks_printed = (char *) alloca (BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1453 memset (blocks_printed, 0, BLOCKVECTOR_NBLOCKS (bl) * sizeof (char));
1457 CORE_ADDR end = BLOCK_END (block) - 4;
1460 if (bl != blockvector_for_pc (end, &index))
1461 error (_("blockvector blotch"));
1462 if (BLOCKVECTOR_BLOCK (bl, index) != block)
1463 error (_("blockvector botch"));
1464 last_index = BLOCKVECTOR_NBLOCKS (bl);
1467 /* Don't print out blocks that have gone by. */
1468 while (index < last_index
1469 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < pc)
1472 while (index < last_index
1473 && BLOCK_END (BLOCKVECTOR_BLOCK (bl, index)) < end)
1475 if (blocks_printed[index] == 0)
1477 if (print_block_frame_labels (BLOCKVECTOR_BLOCK (bl, index), &have_default, stream))
1479 blocks_printed[index] = 1;
1485 if (values_printed && this_level_only)
1488 /* After handling the function's top-level block, stop.
1489 Don't continue to its superblock, the block of
1490 per-file symbols. */
1491 if (BLOCK_FUNCTION (block))
1493 block = BLOCK_SUPERBLOCK (block);
1496 if (!values_printed && !this_level_only)
1498 fprintf_filtered (stream, "No catches.\n");
1503 locals_info (char *args, int from_tty)
1505 print_frame_local_vars (get_selected_frame ("No frame selected."),
1510 catch_info (char *ignore, int from_tty)
1512 struct symtab_and_line *sal;
1514 /* Check for target support for exception handling */
1515 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
1518 /* Currently not handling this */
1519 /* Ideally, here we should interact with the C++ runtime
1520 system to find the list of active handlers, etc. */
1521 fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n");
1525 /* Assume g++ compiled code -- old v 4.16 behaviour */
1526 print_frame_label_vars (get_selected_frame ("No frame selected."),
1532 print_frame_arg_vars (struct frame_info *fi,
1533 struct ui_file *stream)
1535 struct symbol *func = get_frame_function (fi);
1537 struct dict_iterator iter;
1538 struct symbol *sym, *sym2;
1539 int values_printed = 0;
1543 fprintf_filtered (stream, "No symbol table info available.\n");
1547 b = SYMBOL_BLOCK_VALUE (func);
1548 ALL_BLOCK_SYMBOLS (b, iter, sym)
1550 switch (SYMBOL_CLASS (sym))
1556 case LOC_REGPARM_ADDR:
1557 case LOC_BASEREG_ARG:
1558 case LOC_COMPUTED_ARG:
1560 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1561 fputs_filtered (" = ", stream);
1563 /* We have to look up the symbol because arguments can have
1564 two entries (one a parameter, one a local) and the one we
1565 want is the local, which lookup_symbol will find for us.
1566 This includes gcc1 (not gcc2) on the sparc when passing a
1567 small structure and gcc2 when the argument type is float
1568 and it is passed as a double and converted to float by
1569 the prologue (in the latter case the type of the LOC_ARG
1570 symbol is double and the type of the LOC_LOCAL symbol is
1571 float). There are also LOC_ARG/LOC_REGISTER pairs which
1572 are not combined in symbol-reading. */
1574 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
1575 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
1576 print_variable_value (sym2, fi, stream);
1577 fprintf_filtered (stream, "\n");
1581 /* Don't worry about things which aren't arguments. */
1585 if (!values_printed)
1587 fprintf_filtered (stream, "No arguments.\n");
1592 args_info (char *ignore, int from_tty)
1594 print_frame_arg_vars (get_selected_frame ("No frame selected."),
1600 args_plus_locals_info (char *ignore, int from_tty)
1602 args_info (ignore, from_tty);
1603 locals_info (ignore, from_tty);
1607 /* Select frame FI. Also print the stack frame and show the source if
1608 this is the tui version. */
1610 select_and_print_frame (struct frame_info *fi)
1614 print_stack_frame (fi, 1, SRC_AND_LOC);
1617 /* Return the symbol-block in which the selected frame is executing.
1618 Can return zero under various legitimate circumstances.
1620 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1621 code address within the block returned. We use this to decide
1622 which macros are in scope. */
1625 get_selected_block (CORE_ADDR *addr_in_block)
1627 if (!target_has_stack)
1630 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1631 a selected/current frame? Perhaps this function is called,
1632 indirectly, by WFI in "infrun.c" where avoiding the creation of
1633 an inner most frame is very important (it slows down single
1634 step). I suspect, though that this was true in the deep dark
1635 past but is no longer the case. A mindless look at all the
1636 callers tends to support this theory. I think we should be able
1637 to assume that there is always a selcted frame. */
1638 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1640 if (!deprecated_selected_frame)
1642 CORE_ADDR pc = read_pc ();
1643 if (addr_in_block != NULL)
1644 *addr_in_block = pc;
1645 return block_for_pc (pc);
1647 return get_frame_block (deprecated_selected_frame, addr_in_block);
1650 /* Find a frame a certain number of levels away from FRAME.
1651 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1652 Positive means go to earlier frames (up); negative, the reverse.
1653 The int that contains the number of levels is counted toward
1654 zero as the frames for those levels are found.
1655 If the top or bottom frame is reached, that frame is returned,
1656 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1657 how much farther the original request asked to go. */
1660 find_relative_frame (struct frame_info *frame,
1661 int *level_offset_ptr)
1663 struct frame_info *prev;
1664 struct frame_info *frame1;
1666 /* Going up is simple: just do get_prev_frame enough times
1667 or until initial frame is reached. */
1668 while (*level_offset_ptr > 0)
1670 prev = get_prev_frame (frame);
1673 (*level_offset_ptr)--;
1676 /* Going down is just as simple. */
1677 if (*level_offset_ptr < 0)
1679 while (*level_offset_ptr < 0)
1681 frame1 = get_next_frame (frame);
1685 (*level_offset_ptr)++;
1691 /* The "select_frame" command. With no arg, NOP.
1692 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1693 valid level. Otherwise, treat level_exp as an address expression
1694 and select it. See parse_frame_specification for more info on proper
1695 frame expressions. */
1698 select_frame_command (char *level_exp, int from_tty)
1700 select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
1703 /* The "frame" command. With no arg, print selected frame briefly.
1704 With arg, behaves like select_frame and then prints the selected
1708 frame_command (char *level_exp, int from_tty)
1710 select_frame_command (level_exp, from_tty);
1711 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1714 /* The XDB Compatibility command to print the current frame. */
1717 current_frame_command (char *level_exp, int from_tty)
1719 print_stack_frame (get_selected_frame ("No stack."), 1, SRC_AND_LOC);
1722 /* Select the frame up one or COUNT stack levels
1723 from the previously selected frame, and print it briefly. */
1726 up_silently_base (char *count_exp)
1728 struct frame_info *fi;
1729 int count = 1, count1;
1731 count = parse_and_eval_long (count_exp);
1734 fi = find_relative_frame (get_selected_frame ("No stack."), &count1);
1735 if (count1 != 0 && count_exp == 0)
1736 error (_("Initial frame selected; you cannot go up."));
1741 up_silently_command (char *count_exp, int from_tty)
1743 up_silently_base (count_exp);
1747 up_command (char *count_exp, int from_tty)
1749 up_silently_base (count_exp);
1750 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1753 /* Select the frame down one or COUNT stack levels
1754 from the previously selected frame, and print it briefly. */
1757 down_silently_base (char *count_exp)
1759 struct frame_info *frame;
1760 int count = -1, count1;
1762 count = -parse_and_eval_long (count_exp);
1765 frame = find_relative_frame (get_selected_frame ("No stack."), &count1);
1766 if (count1 != 0 && count_exp == 0)
1769 /* We only do this if count_exp is not specified. That way "down"
1770 means to really go down (and let me know if that is
1771 impossible), but "down 9999" can be used to mean go all the way
1772 down without getting an error. */
1774 error (_("Bottom (i.e., innermost) frame selected; you cannot go down."));
1777 select_frame (frame);
1781 down_silently_command (char *count_exp, int from_tty)
1783 down_silently_base (count_exp);
1787 down_command (char *count_exp, int from_tty)
1789 down_silently_base (count_exp);
1790 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
1794 return_command (char *retval_exp, int from_tty)
1796 struct symbol *thisfun;
1797 struct value *return_value = NULL;
1798 const char *query_prefix = "";
1800 thisfun = get_frame_function (get_selected_frame ("No selected frame."));
1802 /* Compute the return value. If the computation triggers an error,
1803 let it bail. If the return type can't be handled, set
1804 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1808 struct type *return_type = NULL;
1810 /* Compute the return value. Should the computation fail, this
1811 call throws an error. */
1812 return_value = parse_and_eval (retval_exp);
1814 /* Cast return value to the return type of the function. Should
1815 the cast fail, this call throws an error. */
1816 if (thisfun != NULL)
1817 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1818 if (return_type == NULL)
1819 return_type = builtin_type_int;
1820 CHECK_TYPEDEF (return_type);
1821 return_value = value_cast (return_type, return_value);
1823 /* Make sure the value is fully evaluated. It may live in the
1824 stack frame we're about to pop. */
1825 if (value_lazy (return_value))
1826 value_fetch_lazy (return_value);
1828 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1829 /* If the return-type is "void", don't try to find the
1830 return-value's location. However, do still evaluate the
1831 return expression so that, even when the expression result
1832 is discarded, side effects such as "return i++" still
1834 return_value = NULL;
1835 /* FIXME: cagney/2004-01-17: If the architecture implements both
1836 return_value and extract_returned_value_address, should allow
1837 "return" to work - don't set return_value to NULL. */
1838 else if (!gdbarch_return_value_p (current_gdbarch)
1839 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT
1840 || TYPE_CODE (return_type) == TYPE_CODE_UNION))
1842 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1843 code. Old architectures don't expect STORE_RETURN_VALUE
1844 to be called with with a small struct that needs to be
1845 stored in registers. Don't start doing it now. */
1847 A structure or union return type is not supported by this architecture.\n\
1848 If you continue, the return value that you specified will be ignored.\n";
1849 return_value = NULL;
1851 else if (using_struct_return (return_type, 0))
1854 The location at which to store the function's return value is unknown.\n\
1855 If you continue, the return value that you specified will be ignored.\n";
1856 return_value = NULL;
1860 /* Does an interactive user really want to do this? Include
1861 information, such as how well GDB can handle the return value, in
1862 the query message. */
1866 if (thisfun == NULL)
1867 confirmed = query (_("%sMake selected stack frame return now? "),
1870 confirmed = query (_("%sMake %s return now? "), query_prefix,
1871 SYMBOL_PRINT_NAME (thisfun));
1873 error (_("Not confirmed"));
1876 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1877 frame in turn, should this code just go straight to the relevant
1878 frame and pop that? */
1880 /* First discard all frames inner-to the selected frame (making the
1881 selected frame current). */
1883 struct frame_id selected_id = get_frame_id (get_selected_frame (NULL));
1884 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ())))
1886 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ())))
1887 /* Caught in the safety net, oops! We've gone way past the
1889 error (_("Problem while popping stack frames (corrupt stack?)"));
1890 frame_pop (get_current_frame ());
1894 /* Second discard the selected frame (which is now also the current
1896 frame_pop (get_current_frame ());
1898 /* Store RETURN_VAUE in the just-returned register set. */
1899 if (return_value != NULL)
1901 struct type *return_type = value_type (return_value);
1902 gdb_assert (gdbarch_return_value (current_gdbarch, return_type,
1904 == RETURN_VALUE_REGISTER_CONVENTION);
1905 gdbarch_return_value (current_gdbarch, return_type,
1906 current_regcache, NULL /*read*/,
1907 value_contents (return_value) /*write*/);
1910 /* If we are at the end of a call dummy now, pop the dummy frame
1912 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1913 frame_pop (get_current_frame ());
1915 /* If interactive, print the frame that is now current. */
1917 frame_command ("0", 1);
1919 select_frame_command ("0", 0);
1922 /* Sets the scope to input function name, provided that the
1923 function is within the current stack frame */
1925 struct function_bounds
1927 CORE_ADDR low, high;
1930 static void func_command (char *arg, int from_tty);
1932 func_command (char *arg, int from_tty)
1934 struct frame_info *fp;
1936 struct symtabs_and_lines sals;
1939 struct function_bounds *func_bounds = (struct function_bounds *) NULL;
1941 if (arg != (char *) NULL)
1944 fp = parse_frame_specification ("0");
1945 sals = decode_line_spec (arg, 1);
1946 func_bounds = (struct function_bounds *) xmalloc (
1947 sizeof (struct function_bounds) * sals.nelts);
1948 for (i = 0; (i < sals.nelts && !found); i++)
1950 if (sals.sals[i].pc == (CORE_ADDR) 0 ||
1951 find_pc_partial_function (sals.sals[i].pc,
1953 &func_bounds[i].low,
1954 &func_bounds[i].high) == 0)
1956 func_bounds[i].low =
1957 func_bounds[i].high = (CORE_ADDR) NULL;
1963 for (i = 0; (i < sals.nelts && !found); i++)
1964 found = (get_frame_pc (fp) >= func_bounds[i].low &&
1965 get_frame_pc (fp) < func_bounds[i].high);
1969 fp = find_relative_frame (fp, &level);
1972 while (!found && level == 0);
1975 xfree (func_bounds);
1978 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
1979 else if (fp != deprecated_selected_frame)
1980 select_and_print_frame (fp);
1983 /* Gets the language of the current frame. */
1986 get_frame_language (void)
1989 enum language flang; /* The language of the current frame */
1991 if (deprecated_selected_frame)
1993 /* We determine the current frame language by looking up its
1994 associated symtab. To retrieve this symtab, we use the frame PC.
1995 However we cannot use the frame pc as is, because it usually points
1996 to the instruction following the "call", which is sometimes the first
1997 instruction of another function. So we rely on
1998 get_frame_address_in_block(), it provides us with a PC which is
1999 guaranteed to be inside the frame's code block. */
2000 s = find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame));
2002 flang = s->language;
2004 flang = language_unknown;
2007 flang = language_unknown;
2013 _initialize_stack (void)
2016 backtrace_limit = 30;
2019 add_com ("return", class_stack, return_command, _("\
2020 Make selected stack frame return to its caller.\n\
2021 Control remains in the debugger, but when you continue\n\
2022 execution will resume in the frame above the one now selected.\n\
2023 If an argument is given, it is an expression for the value to return."));
2025 add_com ("up", class_stack, up_command, _("\
2026 Select and print stack frame that called this one.\n\
2027 An argument says how many frames up to go."));
2028 add_com ("up-silently", class_support, up_silently_command, _("\
2029 Same as the `up' command, but does not print anything.\n\
2030 This is useful in command scripts."));
2032 add_com ("down", class_stack, down_command, _("\
2033 Select and print stack frame called by this one.\n\
2034 An argument says how many frames down to go."));
2035 add_com_alias ("do", "down", class_stack, 1);
2036 add_com_alias ("dow", "down", class_stack, 1);
2037 add_com ("down-silently", class_support, down_silently_command, _("\
2038 Same as the `down' command, but does not print anything.\n\
2039 This is useful in command scripts."));
2041 add_com ("frame", class_stack, frame_command, _("\
2042 Select and print a stack frame.\n\
2043 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2044 An argument specifies the frame to select.\n\
2045 It can be a stack frame number or the address of the frame.\n\
2046 With argument, nothing is printed if input is coming from\n\
2047 a command file or a user-defined command."));
2049 add_com_alias ("f", "frame", class_stack, 1);
2053 add_com ("L", class_stack, current_frame_command,
2054 _("Print the current stack frame.\n"));
2055 add_com_alias ("V", "frame", class_stack, 1);
2057 add_com ("select-frame", class_stack, select_frame_command, _("\
2058 Select a stack frame without printing anything.\n\
2059 An argument specifies the frame to select.\n\
2060 It can be a stack frame number or the address of the frame.\n"));
2062 add_com ("backtrace", class_stack, backtrace_command, _("\
2063 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2064 With a negative argument, print outermost -COUNT frames.\n\
2065 Use of the 'full' qualifier also prints the values of the local variables.\n"));
2066 add_com_alias ("bt", "backtrace", class_stack, 0);
2069 add_com_alias ("t", "backtrace", class_stack, 0);
2070 add_com ("T", class_stack, backtrace_full_command, _("\
2071 Print backtrace of all stack frames, or innermost COUNT frames \n\
2072 and the values of the local variables.\n\
2073 With a negative argument, print outermost -COUNT frames.\n\
2074 Usage: T <count>\n"));
2077 add_com_alias ("where", "backtrace", class_alias, 0);
2078 add_info ("stack", backtrace_command,
2079 _("Backtrace of the stack, or innermost COUNT frames."));
2080 add_info_alias ("s", "stack", 1);
2081 add_info ("frame", frame_info,
2082 _("All about selected stack frame, or frame at ADDR."));
2083 add_info_alias ("f", "frame", 1);
2084 add_info ("locals", locals_info,
2085 _("Local variables of current stack frame."));
2086 add_info ("args", args_info,
2087 _("Argument variables of current stack frame."));
2089 add_com ("l", class_info, args_plus_locals_info,
2090 _("Argument and local variables of current stack frame."));
2093 add_com ("func", class_stack, func_command, _("\
2094 Select the stack frame that contains <func>.\n\
2095 Usage: func <name>\n"));
2097 add_info ("catch", catch_info,
2098 _("Exceptions that can be caught in the current stack frame."));
2101 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command, _(\
2102 "Specify maximum number of frames for \"backtrace\" to print by default."),
2104 add_info ("backtrace-limit", backtrace_limit_info, _("\
2105 The maximum number of frames for \"backtrace\" to print by default."));