1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
4 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free
5 Software Foundation, Inc.
7 This file is part of GDB.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, USA. */
26 #include "gdb_string.h"
30 #include "expression.h"
37 #include "breakpoint.h"
44 #include "gdb_assert.h"
45 #include "dictionary.h"
46 #include "reggroups.h"
49 /* Prototypes for exported functions. */
51 void args_info (char *, int);
53 void locals_info (char *, int);
55 void (*selected_frame_level_changed_hook) (int);
57 void _initialize_stack (void);
59 /* Prototypes for local functions. */
61 static void down_command (char *, int);
63 static void down_silently_base (char *);
65 static void down_silently_command (char *, int);
67 static void up_command (char *, int);
69 static void up_silently_base (char *);
71 static void up_silently_command (char *, int);
73 void frame_command (char *, int);
75 static void current_frame_command (char *, int);
77 static void print_frame_arg_vars (struct frame_info *, struct ui_file *);
79 static void catch_info (char *, int);
81 static void args_plus_locals_info (char *, int);
83 static void print_frame_label_vars (struct frame_info *, int,
86 static void print_frame_local_vars (struct frame_info *, int,
89 static int print_block_frame_labels (struct block *, int *,
92 static int print_block_frame_locals (struct block *,
97 static void print_frame (struct frame_info *fi,
101 struct symtab_and_line sal);
103 static void backtrace_command (char *, int);
105 struct frame_info *parse_frame_specification (char *);
107 static void frame_info (char *, int);
109 extern int addressprint; /* Print addresses, or stay symbolic only? */
111 /* Zero means do things normally; we are interacting directly with the
112 user. One means print the full filename and linenumber when a
113 frame is printed, and do so in a format emacs18/emacs19.22 can
114 parse. Two means print similar annotations, but in many more
115 cases and in a slightly different syntax. */
117 int annotation_level = 0;
120 struct print_stack_frame_args
122 struct frame_info *fi;
128 /* Show or print the frame arguments.
129 Pass the args the way catch_errors wants them. */
130 static int print_stack_frame_stub (void *args);
132 print_stack_frame_stub (void *args)
134 struct print_stack_frame_args *p = (struct print_stack_frame_args *) args;
136 print_frame_info (p->fi, p->level, p->source, p->args);
140 /* Show or print a stack frame briefly. FRAME_INFI should be the frame info
141 and LEVEL should be its level in the stack (or -1 for level not defined).
142 This prints the level, the function executing, the arguments,
143 and the file name and line number.
144 If the pc is not at the beginning of the source line,
145 the actual pc is printed at the beginning.
147 If SOURCE is 1, print the source line as well.
148 If SOURCE is -1, print ONLY the source line. */
151 print_stack_frame (struct frame_info *fi, int level, int source)
153 struct print_stack_frame_args args;
157 args.source = source;
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 /* Print information about a frame for frame "fi" at level "level".
409 Used in "where" output, also used to emit breakpoint or step
411 LEVEL is the level of the frame, or -1 if it is the
412 innermost frame but we don't want to print the level.
413 The meaning of the SOURCE argument is:
414 SRC_LINE: Print only source line
415 LOCATION: Print only location
416 LOC_AND_SRC: Print location and source line. */
419 print_frame_info (struct frame_info *fi, int level, int source, int args)
421 struct symtab_and_line sal;
425 if (get_frame_type (fi) == DUMMY_FRAME
426 || get_frame_type (fi) == SIGTRAMP_FRAME)
428 struct cleanup *uiout_cleanup
429 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
431 annotate_frame_begin (level == -1 ? 0 : level, get_frame_pc (fi));
433 /* Do this regardless of SOURCE because we don't have any source
434 to list for this frame. */
437 ui_out_text (uiout, "#");
438 ui_out_field_fmt_int (uiout, 2, ui_left, "level", level);
440 if (ui_out_is_mi_like_p (uiout))
442 annotate_frame_address ();
443 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
444 annotate_frame_address_end ();
447 if (get_frame_type (fi) == DUMMY_FRAME)
449 annotate_function_call ();
450 ui_out_field_string (uiout, "func", "<function called from gdb>");
452 else if (get_frame_type (fi) == SIGTRAMP_FRAME)
454 annotate_signal_handler_caller ();
455 ui_out_field_string (uiout, "func", "<signal handler called>");
457 ui_out_text (uiout, "\n");
458 annotate_frame_end ();
460 do_cleanups (uiout_cleanup);
464 /* If fi is not the innermost frame, that normally means that fi->pc
465 points to *after* the call instruction, and we want to get the
466 line containing the call, never the next line. But if the next
467 frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the next frame
468 was not entered as the result of a call, and we want to get the
469 line containing fi->pc. */
470 find_frame_sal (fi, &sal);
472 location_print = (source == LOCATION
473 || source == LOC_AND_ADDRESS
474 || source == SRC_AND_LOC);
476 if (location_print || !sal.symtab)
477 print_frame (fi, level, source, args, sal);
479 source_print = (source == SRC_LINE || source == SRC_AND_LOC);
482 set_current_source_symtab_and_line (&sal);
484 if (source_print && sal.symtab)
486 struct symtab_and_line cursal;
488 int mid_statement = (source == SRC_LINE) && (get_frame_pc (fi) != sal.pc);
490 if (annotation_level)
491 done = identify_source_line (sal.symtab, sal.line, mid_statement,
495 if (print_frame_info_listing_hook)
496 print_frame_info_listing_hook (sal.symtab, sal.line, sal.line + 1, 0);
499 /* We used to do this earlier, but that is clearly
500 wrong. This function is used by many different
501 parts of gdb, including normal_stop in infrun.c,
502 which uses this to print out the current PC
503 when we stepi/nexti into the middle of a source
504 line. Only the command line really wants this
505 behavior. Other UIs probably would like the
506 ability to decide for themselves if it is desired. */
507 if (addressprint && mid_statement)
509 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
510 ui_out_text (uiout, "\t");
513 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
516 /* Make sure we have at least a default source file */
517 set_default_source_symtab_and_line ();
518 cursal = get_current_source_symtab_and_line ();
519 cursal.line = max (sal.line - get_lines_to_list () / 2, 1);
520 set_current_source_symtab_and_line (&cursal);
524 set_default_breakpoint (1, get_frame_pc (fi), sal.symtab, sal.line);
526 annotate_frame_end ();
528 gdb_flush (gdb_stdout);
532 print_frame (struct frame_info *fi,
536 struct symtab_and_line sal)
540 enum language funlang = language_unknown;
541 struct ui_stream *stb;
542 struct cleanup *old_chain;
543 struct cleanup *list_chain;
545 stb = ui_out_stream_new (uiout);
546 old_chain = make_cleanup_ui_out_stream_delete (stb);
548 func = find_pc_function (get_frame_address_in_block (fi));
551 /* In certain pathological cases, the symtabs give the wrong
552 function (when we are in the first function in a file which
553 is compiled without debugging symbols, the previous function
554 is compiled with debugging symbols, and the "foo.o" symbol
555 that is supposed to tell us where the file with debugging symbols
556 ends has been truncated by ar because it is longer than 15
557 characters). This also occurs if the user uses asm() to create
558 a function but not stabs for it (in a file compiled -g).
560 So look in the minimal symbol tables as well, and if it comes
561 up with a larger address for the function use that instead.
562 I don't think this can ever cause any problems; there shouldn't
563 be any minimal symbols in the middle of a function; if this is
564 ever changed many parts of GDB will need to be changed (and we'll
565 create a find_pc_minimal_function or some such). */
567 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
569 && (SYMBOL_VALUE_ADDRESS (msymbol)
570 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
573 /* There is no particular reason to think the line number
574 information is wrong. Someone might have just put in
575 a label with asm() but left the line numbers alone. */
576 /* In this case we have no way of knowing the source file
577 and line number, so don't print them. */
580 /* We also don't know anything about the function besides
581 its address and name. */
583 funname = DEPRECATED_SYMBOL_NAME (msymbol);
584 funlang = SYMBOL_LANGUAGE (msymbol);
588 /* I'd like to use SYMBOL_PRINT_NAME() here, to display the
589 demangled name that we already have stored in the symbol
590 table, but we stored a version with DMGL_PARAMS turned
591 on, and here we don't want to display parameters. So call
592 the demangler again, with DMGL_ANSI only. (Yes, I know
593 that printf_symbol_filtered() will again try to demangle
594 the name on the fly, but the issue is that if
595 cplus_demangle() fails here, it'll fail there too. So we
596 want to catch the failure ("demangled==NULL" case below)
597 here, while we still have our hands on the function
600 funname = DEPRECATED_SYMBOL_NAME (func);
601 funlang = SYMBOL_LANGUAGE (func);
602 if (funlang == language_cplus)
604 demangled = cplus_demangle (funname, DMGL_ANSI);
605 if (demangled == NULL)
606 /* If the demangler fails, try the demangled name from
607 the symbol table. This'll have parameters, but
608 that's preferable to diplaying a mangled name. */
609 funname = SYMBOL_PRINT_NAME (func);
615 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_address_in_block (fi));
618 funname = DEPRECATED_SYMBOL_NAME (msymbol);
619 funlang = SYMBOL_LANGUAGE (msymbol);
623 annotate_frame_begin (level == -1 ? 0 : level, get_frame_pc (fi));
625 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
629 ui_out_text (uiout, "#");
630 ui_out_field_fmt_int (uiout, 2, ui_left, "level", level);
633 if (get_frame_pc (fi) != sal.pc
635 || source == LOC_AND_ADDRESS)
637 annotate_frame_address ();
638 ui_out_field_core_addr (uiout, "addr", get_frame_pc (fi));
639 annotate_frame_address_end ();
640 ui_out_text (uiout, " in ");
642 annotate_frame_function_name ();
643 fprintf_symbol_filtered (stb->stream, funname ? funname : "??", funlang,
645 ui_out_field_stream (uiout, "func", stb);
646 ui_out_wrap_hint (uiout, " ");
647 annotate_frame_args ();
649 ui_out_text (uiout, " (");
652 struct print_args_args args;
653 struct cleanup *args_list_chain;
656 args.stream = gdb_stdout;
657 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
658 catch_errors (print_args_stub, &args, "", RETURN_MASK_ALL);
659 /* FIXME: args must be a list. If one argument is a string it will
660 have " that will not be properly escaped. */
661 /* Invoke ui_out_tuple_end. */
662 do_cleanups (args_list_chain);
665 ui_out_text (uiout, ")");
666 if (sal.symtab && sal.symtab->filename)
668 annotate_frame_source_begin ();
669 ui_out_wrap_hint (uiout, " ");
670 ui_out_text (uiout, " at ");
671 annotate_frame_source_file ();
672 ui_out_field_string (uiout, "file", sal.symtab->filename);
673 annotate_frame_source_file_end ();
674 ui_out_text (uiout, ":");
675 annotate_frame_source_line ();
676 ui_out_field_int (uiout, "line", sal.line);
677 annotate_frame_source_end ();
681 if (!funname || (!sal.symtab || !sal.symtab->filename))
683 char *lib = PC_SOLIB (get_frame_pc (fi));
686 annotate_frame_where ();
687 ui_out_wrap_hint (uiout, " ");
688 ui_out_text (uiout, " from ");
689 ui_out_field_string (uiout, "from", lib);
692 #endif /* PC_SOLIB */
694 /* do_cleanups will call ui_out_tuple_end() for us. */
695 do_cleanups (list_chain);
696 ui_out_text (uiout, "\n");
697 do_cleanups (old_chain);
700 /* Show the frame info. If this is the tui, it will be shown in
701 the source display otherwise, nothing is done */
703 show_stack_frame (struct frame_info *fi)
708 /* Read a frame specification in whatever the appropriate format is.
709 Call error() if the specification is in any way invalid (i.e.
710 this function never returns NULL). */
713 parse_frame_specification (char *frame_exp)
717 CORE_ADDR args[MAXARGS];
722 char *addr_string, *p;
723 struct cleanup *tmp_cleanup;
725 while (*frame_exp == ' ')
730 if (numargs > MAXARGS)
731 error ("Too many args in frame specification");
732 /* Parse an argument. */
733 for (p = frame_exp; *p && *p != ' '; p++)
735 addr_string = savestring (frame_exp, p - frame_exp);
740 tmp_cleanup = make_cleanup (xfree, addr_string);
742 /* NOTE: we call parse_and_eval and then both
743 value_as_long and value_as_address rather than calling
744 parse_and_eval_long and parse_and_eval_address because
745 of the issue of potential side effects from evaluating
747 vp = parse_and_eval (addr_string);
749 level = value_as_long (vp);
751 args[numargs++] = value_as_address (vp);
752 do_cleanups (tmp_cleanup);
755 /* Skip spaces, move to possible next arg. */
765 if (deprecated_selected_frame == NULL)
766 error ("No selected frame.");
767 return deprecated_selected_frame;
771 struct frame_info *fid =
772 find_relative_frame (get_current_frame (), &level);
773 struct frame_info *tfid;
776 /* find_relative_frame was successful */
779 /* If SETUP_ARBITRARY_FRAME is defined, then frame specifications
780 take at least 2 addresses. It is important to detect this case
781 here so that "frame 100" does not give a confusing error message
782 like "frame specification requires two addresses". This of course
783 does not solve the "frame 100" problem for machines on which
784 a frame specification can be made with one address. To solve
785 that, we need a new syntax for a specifying a frame by address.
786 I think the cleanest syntax is $frame(0x45) ($frame(0x23,0x45) for
787 two args, etc.), but people might think that is too much typing,
788 so I guess *0x23,0x45 would be a possible alternative (commas
789 really should be used instead of spaces to delimit; using spaces
790 normally works in an expression). */
791 #ifdef SETUP_ARBITRARY_FRAME
792 error ("No frame %s", paddr_d (args[0]));
795 /* If (s)he specifies the frame with an address, he deserves what
796 (s)he gets. Still, give the highest one that matches. */
798 for (fid = get_current_frame ();
799 fid && get_frame_base (fid) != args[0];
800 fid = get_prev_frame (fid))
804 while ((tfid = get_prev_frame (fid)) &&
805 (get_frame_base (tfid) == args[0]))
808 /* We couldn't identify the frame as an existing frame, but
809 perhaps we can create one with a single argument. */
813 #ifdef SETUP_ARBITRARY_FRAME
814 return SETUP_ARBITRARY_FRAME (numargs, args);
816 /* Usual case. Do it here rather than have everyone supply
817 a SETUP_ARBITRARY_FRAME that does this. */
819 return create_new_frame (args[0], 0);
820 error ("Too many args in frame specification");
827 /* Print verbosely the selected frame or the frame at address ADDR.
828 This means absolutely all information in the frame is printed. */
831 frame_info (char *addr_exp, int from_tty)
833 struct frame_info *fi;
834 struct symtab_and_line sal;
837 struct frame_info *calling_frame_info;
838 int i, count, numregs;
840 enum language funlang = language_unknown;
841 const char *pc_regname;
843 if (!target_has_stack)
846 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
847 is not a good name. */
849 /* OK, this is weird. The PC_REGNUM hardware register's value can
850 easily not match that of the internal value returned by
852 pc_regname = REGISTER_NAME (PC_REGNUM);
854 /* But then, this is weird to. Even without PC_REGNUM, an
855 architectures will often have a hardware register called "pc",
856 and that register's value, again, can easily not match
860 fi = parse_frame_specification (addr_exp);
862 error ("Invalid frame specified.");
864 find_frame_sal (fi, &sal);
865 func = get_frame_function (fi);
866 /* FIXME: cagney/2002-11-28: Why bother? Won't sal.symtab contain
868 s = find_pc_symtab (get_frame_pc (fi));
871 /* I'd like to use SYMBOL_PRINT_NAME() here, to display
872 * the demangled name that we already have stored in
873 * the symbol table, but we stored a version with
874 * DMGL_PARAMS turned on, and here we don't want
875 * to display parameters. So call the demangler again,
876 * with DMGL_ANSI only. RT
877 * (Yes, I know that printf_symbol_filtered() will
878 * again try to demangle the name on the fly, but
879 * the issue is that if cplus_demangle() fails here,
880 * it'll fail there too. So we want to catch the failure
881 * ("demangled==NULL" case below) here, while we still
882 * have our hands on the function symbol.)
885 funname = DEPRECATED_SYMBOL_NAME (func);
886 funlang = SYMBOL_LANGUAGE (func);
887 if (funlang == language_cplus)
889 demangled = cplus_demangle (funname, DMGL_ANSI);
890 /* If the demangler fails, try the demangled name
891 * from the symbol table. This'll have parameters,
892 * but that's preferable to diplaying a mangled name.
894 if (demangled == NULL)
895 funname = SYMBOL_PRINT_NAME (func);
900 struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (get_frame_pc (fi));
903 funname = DEPRECATED_SYMBOL_NAME (msymbol);
904 funlang = SYMBOL_LANGUAGE (msymbol);
907 calling_frame_info = get_prev_frame (fi);
909 if (!addr_exp && frame_relative_level (deprecated_selected_frame) >= 0)
911 printf_filtered ("Stack level %d, frame at ",
912 frame_relative_level (deprecated_selected_frame));
913 print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
914 printf_filtered (":\n");
918 printf_filtered ("Stack frame at ");
919 print_address_numeric (get_frame_base (fi), 1, gdb_stdout);
920 printf_filtered (":\n");
922 printf_filtered (" %s = ", pc_regname);
923 print_address_numeric (get_frame_pc (fi), 1, gdb_stdout);
928 printf_filtered (" in ");
929 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
930 DMGL_ANSI | DMGL_PARAMS);
934 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
935 puts_filtered ("; ");
937 printf_filtered ("saved %s ", pc_regname);
938 print_address_numeric (frame_pc_unwind (fi), 1, gdb_stdout);
939 printf_filtered ("\n");
943 frameless = (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P ()
944 && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (fi));
946 printf_filtered (" (FRAMELESS),");
949 if (calling_frame_info)
951 printf_filtered (" called by frame at ");
952 print_address_numeric (get_frame_base (calling_frame_info),
955 if (get_next_frame (fi) && calling_frame_info)
958 if (get_next_frame (fi))
960 printf_filtered (" caller of frame at ");
961 print_address_numeric (get_frame_base (get_next_frame (fi)), 1,
964 if (get_next_frame (fi) || calling_frame_info)
965 puts_filtered ("\n");
967 printf_filtered (" source language %s.\n",
968 language_str (s->language));
971 /* Address of the argument list for this frame, or 0. */
972 CORE_ADDR arg_list = get_frame_args_address (fi);
973 /* Number of args for this frame, or -1 if unknown. */
977 printf_filtered (" Arglist at unknown address.\n");
980 printf_filtered (" Arglist at ");
981 print_address_numeric (arg_list, 1, gdb_stdout);
982 printf_filtered (",");
984 if (!FRAME_NUM_ARGS_P ())
987 puts_filtered (" args: ");
991 numargs = FRAME_NUM_ARGS (fi);
992 gdb_assert (numargs >= 0);
994 puts_filtered (" no args.");
995 else if (numargs == 1)
996 puts_filtered (" 1 arg: ");
998 printf_filtered (" %d args: ", numargs);
1000 print_frame_args (func, fi, numargs, gdb_stdout);
1001 puts_filtered ("\n");
1005 /* Address of the local variables for this frame, or 0. */
1006 CORE_ADDR arg_list = get_frame_locals_address (fi);
1009 printf_filtered (" Locals at unknown address,");
1012 printf_filtered (" Locals at ");
1013 print_address_numeric (arg_list, 1, gdb_stdout);
1014 printf_filtered (",");
1018 if (DEPRECATED_FRAME_INIT_SAVED_REGS_P ()
1019 && deprecated_get_frame_saved_regs (fi) == NULL)
1020 DEPRECATED_FRAME_INIT_SAVED_REGS (fi);
1021 /* Print as much information as possible on the location of all the
1024 enum lval_type lval;
1032 /* The sp is special; what's displayed isn't the save address, but
1033 the value of the previous frame's sp. This is a legacy thing,
1034 at one stage the frame cached the previous frame's SP instead
1035 of its address, hence it was easiest to just display the cached
1039 /* Find out the location of the saved stack pointer with out
1040 actually evaluating it. */
1041 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1043 if (!optimized && lval == not_lval)
1045 char value[MAX_REGISTER_SIZE];
1047 frame_register_unwind (fi, SP_REGNUM, &optimized, &lval, &addr,
1049 /* NOTE: cagney/2003-05-22: This is assuming that the
1050 stack pointer was packed as an unsigned integer. That
1051 may or may not be valid. */
1052 sp = extract_unsigned_integer (value, DEPRECATED_REGISTER_RAW_SIZE (SP_REGNUM));
1053 printf_filtered (" Previous frame's sp is ");
1054 print_address_numeric (sp, 1, gdb_stdout);
1055 printf_filtered ("\n");
1058 else if (!optimized && lval == lval_memory)
1060 printf_filtered (" Previous frame's sp at ");
1061 print_address_numeric (addr, 1, gdb_stdout);
1062 printf_filtered ("\n");
1065 else if (!optimized && lval == lval_register)
1067 printf_filtered (" Previous frame's sp in %s\n",
1068 REGISTER_NAME (realnum));
1071 /* else keep quiet. */
1075 numregs = NUM_REGS + NUM_PSEUDO_REGS;
1076 for (i = 0; i < numregs; i++)
1078 && gdbarch_register_reggroup_p (current_gdbarch, i, all_reggroup))
1080 /* Find out the location of the saved register without
1081 fetching the corresponding value. */
1082 frame_register_unwind (fi, i, &optimized, &lval, &addr, &realnum,
1084 /* For moment, only display registers that were saved on the
1086 if (!optimized && lval == lval_memory)
1089 puts_filtered (" Saved registers:\n ");
1091 puts_filtered (",");
1093 printf_filtered (" %s at ", REGISTER_NAME (i));
1094 print_address_numeric (addr, 1, gdb_stdout);
1098 if (count || need_nl)
1099 puts_filtered ("\n");
1104 /* Set a limit on the number of frames printed by default in a
1107 static int backtrace_limit;
1110 set_backtrace_limit_command (char *count_exp, int from_tty)
1112 int count = parse_and_eval_long (count_exp);
1115 error ("Negative argument not meaningful as backtrace limit.");
1117 backtrace_limit = count;
1121 backtrace_limit_info (char *arg, int from_tty)
1124 error ("\"Info backtrace-limit\" takes no arguments.");
1126 printf_unfiltered ("Backtrace limit: %d.\n", backtrace_limit);
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, trailing_level + i, 0, 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 (DEPRECATED_STREQ (DEPRECATED_SYMBOL_NAME (sym), "default"))
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 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 if (!deprecated_selected_frame)
1515 error ("No frame selected.");
1516 print_frame_local_vars (deprecated_selected_frame, 0, gdb_stdout);
1520 catch_info (char *ignore, int from_tty)
1522 struct symtab_and_line *sal;
1524 /* Check for target support for exception handling */
1525 sal = target_enable_exception_callback (EX_EVENT_CATCH, 1);
1528 /* Currently not handling this */
1529 /* Ideally, here we should interact with the C++ runtime
1530 system to find the list of active handlers, etc. */
1531 fprintf_filtered (gdb_stdout, "Info catch not supported with this target/compiler combination.\n");
1533 if (!deprecated_selected_frame)
1534 error ("No frame selected.");
1539 /* Assume g++ compiled code -- old v 4.16 behaviour */
1540 if (!deprecated_selected_frame)
1541 error ("No frame selected.");
1543 print_frame_label_vars (deprecated_selected_frame, 0, gdb_stdout);
1548 print_frame_arg_vars (struct frame_info *fi,
1549 struct ui_file *stream)
1551 struct symbol *func = get_frame_function (fi);
1553 struct dict_iterator iter;
1554 struct symbol *sym, *sym2;
1555 int values_printed = 0;
1559 fprintf_filtered (stream, "No symbol table info available.\n");
1563 b = SYMBOL_BLOCK_VALUE (func);
1564 ALL_BLOCK_SYMBOLS (b, iter, sym)
1566 switch (SYMBOL_CLASS (sym))
1572 case LOC_REGPARM_ADDR:
1573 case LOC_BASEREG_ARG:
1574 case LOC_COMPUTED_ARG:
1576 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1577 fputs_filtered (" = ", stream);
1579 /* We have to look up the symbol because arguments can have
1580 two entries (one a parameter, one a local) and the one we
1581 want is the local, which lookup_symbol will find for us.
1582 This includes gcc1 (not gcc2) on the sparc when passing a
1583 small structure and gcc2 when the argument type is float
1584 and it is passed as a double and converted to float by
1585 the prologue (in the latter case the type of the LOC_ARG
1586 symbol is double and the type of the LOC_LOCAL symbol is
1587 float). There are also LOC_ARG/LOC_REGISTER pairs which
1588 are not combined in symbol-reading. */
1590 sym2 = lookup_symbol (DEPRECATED_SYMBOL_NAME (sym),
1591 b, VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL);
1592 print_variable_value (sym2, fi, stream);
1593 fprintf_filtered (stream, "\n");
1597 /* Don't worry about things which aren't arguments. */
1601 if (!values_printed)
1603 fprintf_filtered (stream, "No arguments.\n");
1608 args_info (char *ignore, int from_tty)
1610 if (!deprecated_selected_frame)
1611 error ("No frame selected.");
1612 print_frame_arg_vars (deprecated_selected_frame, gdb_stdout);
1617 args_plus_locals_info (char *ignore, int from_tty)
1619 args_info (ignore, from_tty);
1620 locals_info (ignore, from_tty);
1624 /* Select frame FI. Also print the stack frame and show the source if
1625 this is the tui version. */
1627 select_and_print_frame (struct frame_info *fi)
1632 print_stack_frame (fi, frame_relative_level (fi), 1);
1636 /* Return the symbol-block in which the selected frame is executing.
1637 Can return zero under various legitimate circumstances.
1639 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
1640 code address within the block returned. We use this to decide
1641 which macros are in scope. */
1644 get_selected_block (CORE_ADDR *addr_in_block)
1646 if (!target_has_stack)
1649 /* NOTE: cagney/2002-11-28: Why go to all this effort to not create
1650 a selected/current frame? Perhaphs this function is called,
1651 indirectly, by WFI in "infrun.c" where avoiding the creation of
1652 an inner most frame is very important (it slows down single
1653 step). I suspect, though that this was true in the deep dark
1654 past but is no longer the case. A mindless look at all the
1655 callers tends to support this theory. I think we should be able
1656 to assume that there is always a selcted frame. */
1657 /* gdb_assert (deprecated_selected_frame != NULL); So, do you feel
1659 if (!deprecated_selected_frame)
1661 CORE_ADDR pc = read_pc ();
1662 if (addr_in_block != NULL)
1663 *addr_in_block = pc;
1664 return block_for_pc (pc);
1666 return get_frame_block (deprecated_selected_frame, addr_in_block);
1669 /* Find a frame a certain number of levels away from FRAME.
1670 LEVEL_OFFSET_PTR points to an int containing the number of levels.
1671 Positive means go to earlier frames (up); negative, the reverse.
1672 The int that contains the number of levels is counted toward
1673 zero as the frames for those levels are found.
1674 If the top or bottom frame is reached, that frame is returned,
1675 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
1676 how much farther the original request asked to go. */
1679 find_relative_frame (struct frame_info *frame,
1680 int *level_offset_ptr)
1682 struct frame_info *prev;
1683 struct frame_info *frame1;
1685 /* Going up is simple: just do get_prev_frame enough times
1686 or until initial frame is reached. */
1687 while (*level_offset_ptr > 0)
1689 prev = get_prev_frame (frame);
1692 (*level_offset_ptr)--;
1695 /* Going down is just as simple. */
1696 if (*level_offset_ptr < 0)
1698 while (*level_offset_ptr < 0)
1700 frame1 = get_next_frame (frame);
1704 (*level_offset_ptr)++;
1710 /* The "select_frame" command. With no arg, NOP.
1711 With arg LEVEL_EXP, select the frame at level LEVEL if it is a
1712 valid level. Otherwise, treat level_exp as an address expression
1713 and select it. See parse_frame_specification for more info on proper
1714 frame expressions. */
1717 select_frame_command (char *level_exp, int from_tty)
1719 struct frame_info *frame;
1720 int level = frame_relative_level (deprecated_selected_frame);
1722 if (!target_has_stack)
1723 error ("No stack.");
1725 frame = parse_frame_specification (level_exp);
1727 select_frame (frame);
1728 if (level != frame_relative_level (deprecated_selected_frame))
1729 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame));
1732 /* The "frame" command. With no arg, print selected frame briefly.
1733 With arg, behaves like select_frame and then prints the selected
1737 frame_command (char *level_exp, int from_tty)
1739 select_frame_command (level_exp, from_tty);
1740 print_stack_frame (deprecated_selected_frame,
1741 frame_relative_level (deprecated_selected_frame), 1);
1744 /* The XDB Compatibility command to print the current frame. */
1747 current_frame_command (char *level_exp, int from_tty)
1749 if (target_has_stack == 0 || deprecated_selected_frame == 0)
1750 error ("No stack.");
1751 print_stack_frame (deprecated_selected_frame,
1752 frame_relative_level (deprecated_selected_frame), 1);
1755 /* Select the frame up one or COUNT stack levels
1756 from the previously selected frame, and print it briefly. */
1759 up_silently_base (char *count_exp)
1761 struct frame_info *fi;
1762 int count = 1, count1;
1764 count = parse_and_eval_long (count_exp);
1767 if (target_has_stack == 0 || deprecated_selected_frame == 0)
1768 error ("No stack.");
1770 fi = find_relative_frame (deprecated_selected_frame, &count1);
1771 if (count1 != 0 && count_exp == 0)
1772 error ("Initial frame selected; you cannot go up.");
1774 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame));
1778 up_silently_command (char *count_exp, int from_tty)
1780 up_silently_base (count_exp);
1784 up_command (char *count_exp, int from_tty)
1786 up_silently_base (count_exp);
1787 print_stack_frame (deprecated_selected_frame,
1788 frame_relative_level (deprecated_selected_frame), 1);
1791 /* Select the frame down one or COUNT stack levels
1792 from the previously selected frame, and print it briefly. */
1795 down_silently_base (char *count_exp)
1797 struct frame_info *frame;
1798 int count = -1, count1;
1800 count = -parse_and_eval_long (count_exp);
1803 if (target_has_stack == 0 || deprecated_selected_frame == 0)
1804 error ("No stack.");
1806 frame = find_relative_frame (deprecated_selected_frame, &count1);
1807 if (count1 != 0 && count_exp == 0)
1810 /* We only do this if count_exp is not specified. That way "down"
1811 means to really go down (and let me know if that is
1812 impossible), but "down 9999" can be used to mean go all the way
1813 down without getting an error. */
1815 error ("Bottom (i.e., innermost) frame selected; you cannot go down.");
1818 select_frame (frame);
1819 selected_frame_level_changed_event (frame_relative_level (deprecated_selected_frame));
1823 down_silently_command (char *count_exp, int from_tty)
1825 down_silently_base (count_exp);
1829 down_command (char *count_exp, int from_tty)
1831 down_silently_base (count_exp);
1832 print_stack_frame (deprecated_selected_frame,
1833 frame_relative_level (deprecated_selected_frame), 1);
1837 return_command (char *retval_exp, int from_tty)
1839 struct symbol *thisfun;
1840 struct value *return_value = NULL;
1841 const char *query_prefix = "";
1843 /* FIXME: cagney/2003-10-20: Perform a minimal existance test on the
1844 target. If that fails, error out. For the moment don't rely on
1845 get_selected_frame as it's error message is the the singularly
1846 obscure "No registers". */
1847 if (!target_has_registers)
1848 error ("No selected frame.");
1849 thisfun = get_frame_function (get_selected_frame ());
1851 /* Compute the return value. If the computation triggers an error,
1852 let it bail. If the return type can't be handled, set
1853 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
1857 struct type *return_type = NULL;
1859 /* Compute the return value. Should the computation fail, this
1860 call throws an error. */
1861 return_value = parse_and_eval (retval_exp);
1863 /* Cast return value to the return type of the function. Should
1864 the cast fail, this call throws an error. */
1865 if (thisfun != NULL)
1866 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
1867 if (return_type == NULL)
1868 return_type = builtin_type_int;
1869 return_value = value_cast (return_type, return_value);
1871 /* Make sure the value is fully evaluated. It may live in the
1872 stack frame we're about to pop. */
1873 if (VALUE_LAZY (return_value))
1874 value_fetch_lazy (return_value);
1876 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
1877 /* If the return-type is "void", don't try to find the
1878 return-value's location. However, do still evaluate the
1879 return expression so that, even when the expression result
1880 is discarded, side effects such as "return i++" still
1882 return_value = NULL;
1883 /* FIXME: cagney/2004-01-17: If the architecture implements both
1884 return_value and extract_returned_value_address, should allow
1885 "return" to work - don't set return_value to NULL. */
1886 else if (!gdbarch_return_value_p (current_gdbarch)
1887 && (TYPE_CODE (return_type) == TYPE_CODE_STRUCT
1888 || TYPE_CODE (return_type) == TYPE_CODE_UNION))
1890 /* NOTE: cagney/2003-10-20: Compatibility hack for legacy
1891 code. Old architectures don't expect STORE_RETURN_VALUE
1892 to be called with with a small struct that needs to be
1893 stored in registers. Don't start doing it now. */
1895 A structure or union return type is not supported by this architecture.\n\
1896 If you continue, the return value that you specified will be ignored.\n";
1897 return_value = NULL;
1899 else if (using_struct_return (return_type, 0))
1902 The location at which to store the function's return value is unknown.\n\
1903 If you continue, the return value that you specified will be ignored.\n";
1904 return_value = NULL;
1908 /* Does an interactive user really want to do this? Include
1909 information, such as how well GDB can handle the return value, in
1910 the query message. */
1914 if (thisfun == NULL)
1915 confirmed = query ("%sMake selected stack frame return now? ",
1918 confirmed = query ("%sMake %s return now? ", query_prefix,
1919 SYMBOL_PRINT_NAME (thisfun));
1921 error ("Not confirmed");
1924 /* NOTE: cagney/2003-01-18: Is this silly? Rather than pop each
1925 frame in turn, should this code just go straight to the relevant
1926 frame and pop that? */
1928 /* First discard all frames inner-to the selected frame (making the
1929 selected frame current). */
1931 struct frame_id selected_id = get_frame_id (get_selected_frame ());
1932 while (!frame_id_eq (selected_id, get_frame_id (get_current_frame ())))
1934 if (frame_id_inner (selected_id, get_frame_id (get_current_frame ())))
1935 /* Caught in the safety net, oops! We've gone way past the
1937 error ("Problem while popping stack frames (corrupt stack?)");
1938 frame_pop (get_current_frame ());
1942 /* Second discard the selected frame (which is now also the current
1944 frame_pop (get_current_frame ());
1946 /* Store RETURN_VAUE in the just-returned register set. */
1947 if (return_value != NULL)
1949 struct type *return_type = VALUE_TYPE (return_value);
1950 if (!gdbarch_return_value_p (current_gdbarch))
1952 STORE_RETURN_VALUE (return_type, current_regcache,
1953 VALUE_CONTENTS (return_value));
1955 /* FIXME: cagney/2004-01-17: If extract_returned_value_address
1956 is available and the function is using
1957 RETURN_VALUE_STRUCT_CONVENTION, should use it to find the
1958 address of the returned value so that it can be assigned. */
1961 gdb_assert (gdbarch_return_value (current_gdbarch, return_type,
1963 == RETURN_VALUE_REGISTER_CONVENTION);
1964 gdbarch_return_value (current_gdbarch, return_type,
1965 current_regcache, NULL /*read*/,
1966 VALUE_CONTENTS (return_value) /*write*/);
1970 /* If we are at the end of a call dummy now, pop the dummy frame
1972 /* NOTE: cagney/2003-01-18: Is this silly? Instead of popping all
1973 the frames in sequence, should this code just pop the dummy frame
1975 #ifdef DEPRECATED_CALL_DUMMY_HAS_COMPLETED
1976 /* Since all up-to-date architectures return direct to the dummy
1977 breakpoint address, a dummy frame has, by definition, always
1978 completed. Hence this method is no longer needed. */
1979 if (DEPRECATED_CALL_DUMMY_HAS_COMPLETED (read_pc(), read_sp (),
1980 get_frame_base (get_current_frame ())))
1981 frame_pop (get_current_frame ());
1983 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
1984 frame_pop (get_current_frame ());
1987 /* If interactive, print the frame that is now current. */
1989 frame_command ("0", 1);
1991 select_frame_command ("0", 0);
1994 /* Sets the scope to input function name, provided that the
1995 function is within the current stack frame */
1997 struct function_bounds
1999 CORE_ADDR low, high;
2002 static void func_command (char *arg, int from_tty);
2004 func_command (char *arg, int from_tty)
2006 struct frame_info *fp;
2008 struct symtabs_and_lines sals;
2011 struct function_bounds *func_bounds = (struct function_bounds *) NULL;
2013 if (arg != (char *) NULL)
2016 fp = parse_frame_specification ("0");
2017 sals = decode_line_spec (arg, 1);
2018 func_bounds = (struct function_bounds *) xmalloc (
2019 sizeof (struct function_bounds) * sals.nelts);
2020 for (i = 0; (i < sals.nelts && !found); i++)
2022 if (sals.sals[i].pc == (CORE_ADDR) 0 ||
2023 find_pc_partial_function (sals.sals[i].pc,
2025 &func_bounds[i].low,
2026 &func_bounds[i].high) == 0)
2028 func_bounds[i].low =
2029 func_bounds[i].high = (CORE_ADDR) NULL;
2035 for (i = 0; (i < sals.nelts && !found); i++)
2036 found = (get_frame_pc (fp) >= func_bounds[i].low &&
2037 get_frame_pc (fp) < func_bounds[i].high);
2041 fp = find_relative_frame (fp, &level);
2044 while (!found && level == 0);
2047 xfree (func_bounds);
2050 printf_filtered ("'%s' not within current stack frame.\n", arg);
2051 else if (fp != deprecated_selected_frame)
2052 select_and_print_frame (fp);
2055 /* Gets the language of the current frame. */
2058 get_frame_language (void)
2061 enum language flang; /* The language of the current frame */
2063 if (deprecated_selected_frame)
2065 /* We determine the current frame language by looking up its
2066 associated symtab. To retrieve this symtab, we use the frame PC.
2067 However we cannot use the frame pc as is, because it usually points
2068 to the instruction following the "call", which is sometimes the first
2069 instruction of another function. So we rely on
2070 get_frame_address_in_block(), it provides us with a PC which is
2071 guaranteed to be inside the frame's code block. */
2072 s = find_pc_symtab (get_frame_address_in_block (deprecated_selected_frame));
2074 flang = s->language;
2076 flang = language_unknown;
2079 flang = language_unknown;
2085 _initialize_stack (void)
2088 backtrace_limit = 30;
2091 add_com ("return", class_stack, return_command,
2092 "Make selected stack frame return to its caller.\n\
2093 Control remains in the debugger, but when you continue\n\
2094 execution will resume in the frame above the one now selected.\n\
2095 If an argument is given, it is an expression for the value to return.");
2097 add_com ("up", class_stack, up_command,
2098 "Select and print stack frame that called this one.\n\
2099 An argument says how many frames up to go.");
2100 add_com ("up-silently", class_support, up_silently_command,
2101 "Same as the `up' command, but does not print anything.\n\
2102 This is useful in command scripts.");
2104 add_com ("down", class_stack, down_command,
2105 "Select and print stack frame called by this one.\n\
2106 An argument says how many frames down to go.");
2107 add_com_alias ("do", "down", class_stack, 1);
2108 add_com_alias ("dow", "down", class_stack, 1);
2109 add_com ("down-silently", class_support, down_silently_command,
2110 "Same as the `down' command, but does not print anything.\n\
2111 This is useful in command scripts.");
2113 add_com ("frame", class_stack, frame_command,
2114 "Select and print a stack frame.\n\
2115 With no argument, print the selected stack frame. (See also \"info frame\").\n\
2116 An argument specifies the frame to select.\n\
2117 It can be a stack frame number or the address of the frame.\n\
2118 With argument, nothing is printed if input is coming from\n\
2119 a command file or a user-defined command.");
2121 add_com_alias ("f", "frame", class_stack, 1);
2125 add_com ("L", class_stack, current_frame_command,
2126 "Print the current stack frame.\n");
2127 add_com_alias ("V", "frame", class_stack, 1);
2129 add_com ("select-frame", class_stack, select_frame_command,
2130 "Select a stack frame without printing anything.\n\
2131 An argument specifies the frame to select.\n\
2132 It can be a stack frame number or the address of the frame.\n");
2134 add_com ("backtrace", class_stack, backtrace_command,
2135 "Print backtrace of all stack frames, or innermost COUNT frames.\n\
2136 With a negative argument, print outermost -COUNT frames.\n\
2137 Use of the 'full' qualifier also prints the values of the local variables.\n");
2138 add_com_alias ("bt", "backtrace", class_stack, 0);
2141 add_com_alias ("t", "backtrace", class_stack, 0);
2142 add_com ("T", class_stack, backtrace_full_command,
2143 "Print backtrace of all stack frames, or innermost COUNT frames \n\
2144 and the values of the local variables.\n\
2145 With a negative argument, print outermost -COUNT frames.\n\
2146 Usage: T <count>\n");
2149 add_com_alias ("where", "backtrace", class_alias, 0);
2150 add_info ("stack", backtrace_command,
2151 "Backtrace of the stack, or innermost COUNT frames.");
2152 add_info_alias ("s", "stack", 1);
2153 add_info ("frame", frame_info,
2154 "All about selected stack frame, or frame at ADDR.");
2155 add_info_alias ("f", "frame", 1);
2156 add_info ("locals", locals_info,
2157 "Local variables of current stack frame.");
2158 add_info ("args", args_info,
2159 "Argument variables of current stack frame.");
2161 add_com ("l", class_info, args_plus_locals_info,
2162 "Argument and local variables of current stack frame.");
2165 add_com ("func", class_stack, func_command,
2166 "Select the stack frame that contains <func>.\nUsage: func <name>\n");
2168 add_info ("catch", catch_info,
2169 "Exceptions that can be caught in the current stack frame.");
2172 add_cmd ("backtrace-limit", class_stack, set_backtrace_limit_command,
2173 "Specify maximum number of frames for \"backtrace\" to print by default.",
2175 add_info ("backtrace-limit", backtrace_limit_info,
2176 "The maximum number of frames for \"backtrace\" to print by default.");