1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "expression.h"
31 #include "breakpoint.h"
38 #include "dictionary.h"
39 #include "reggroups.h"
43 #include "gdbthread.h"
44 #include "cp-support.h"
46 #include "inline-frame.h"
48 #include "cli/cli-utils.h"
51 #include "safe-ctype.h"
53 #include "extension.h"
55 #include "common/def-vector.h"
57 /* The possible choices of "set print frame-arguments", and the value
60 static const char *const print_frame_arguments_choices[] =
61 {"all", "scalars", "none", NULL};
62 static const char *print_frame_arguments = "scalars";
64 /* If non-zero, don't invoke pretty-printers for frame arguments. */
65 static int print_raw_frame_arguments;
67 /* The possible choices of "set print entry-values", and the value
70 const char print_entry_values_no[] = "no";
71 const char print_entry_values_only[] = "only";
72 const char print_entry_values_preferred[] = "preferred";
73 const char print_entry_values_if_needed[] = "if-needed";
74 const char print_entry_values_both[] = "both";
75 const char print_entry_values_compact[] = "compact";
76 const char print_entry_values_default[] = "default";
77 static const char *const print_entry_values_choices[] =
79 print_entry_values_no,
80 print_entry_values_only,
81 print_entry_values_preferred,
82 print_entry_values_if_needed,
83 print_entry_values_both,
84 print_entry_values_compact,
85 print_entry_values_default,
88 const char *print_entry_values = print_entry_values_default;
90 /* Prototypes for local functions. */
92 static void print_frame_local_vars (struct frame_info *, int,
95 static void print_frame (struct frame_info *frame, int print_level,
96 enum print_what print_what, int print_args,
97 struct symtab_and_line sal);
99 static void set_last_displayed_sal (int valid,
100 struct program_space *pspace,
102 struct symtab *symtab,
105 /* Zero means do things normally; we are interacting directly with the
106 user. One means print the full filename and linenumber when a
107 frame is printed, and do so in a format emacs18/emacs19.22 can
108 parse. Two means print similar annotations, but in many more
109 cases and in a slightly different syntax. */
111 int annotation_level = 0;
113 /* These variables hold the last symtab and line we displayed to the user.
114 * This is where we insert a breakpoint or a skiplist entry by default. */
115 static int last_displayed_sal_valid = 0;
116 static struct program_space *last_displayed_pspace = 0;
117 static CORE_ADDR last_displayed_addr = 0;
118 static struct symtab *last_displayed_symtab = 0;
119 static int last_displayed_line = 0;
122 /* Return 1 if we should display the address in addition to the location,
123 because we are in the middle of a statement. */
126 frame_show_address (struct frame_info *frame,
127 struct symtab_and_line sal)
129 /* If there is a line number, but no PC, then there is no location
130 information associated with this sal. The only way that should
131 happen is for the call sites of inlined functions (SAL comes from
132 find_frame_sal). Otherwise, we would have some PC range if the
133 SAL came from a line table. */
134 if (sal.line != 0 && sal.pc == 0 && sal.end == 0)
136 if (get_next_frame (frame) == NULL)
137 gdb_assert (inline_skipped_frames (inferior_ptid) > 0);
139 gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME);
143 return get_frame_pc (frame) != sal.pc;
149 print_stack_frame_to_uiout (struct ui_out *uiout, struct frame_info *frame,
150 int print_level, enum print_what print_what,
153 scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout);
155 print_stack_frame (frame, print_level, print_what, set_current_sal);
158 /* Show or print a stack frame FRAME briefly. The output is formatted
159 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
160 relative level, function name, argument list, and file name and
161 line number. If the frame's PC is not at the beginning of the
162 source line, the actual PC is printed at the beginning. */
165 print_stack_frame (struct frame_info *frame, int print_level,
166 enum print_what print_what,
170 /* For mi, alway print location and address. */
171 if (current_uiout->is_mi_like_p ())
172 print_what = LOC_AND_ADDRESS;
176 print_frame_info (frame, print_level, print_what, 1 /* print_args */,
179 set_current_sal_from_frame (frame);
181 CATCH (e, RETURN_MASK_ERROR)
187 /* Print nameless arguments of frame FRAME on STREAM, where START is
188 the offset of the first nameless argument, and NUM is the number of
189 nameless arguments to print. FIRST is nonzero if this is the first
190 argument (not just the first nameless argument). */
193 print_frame_nameless_args (struct frame_info *frame, long start, int num,
194 int first, struct ui_file *stream)
196 struct gdbarch *gdbarch = get_frame_arch (frame);
197 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
202 for (i = 0; i < num; i++)
205 argsaddr = get_frame_args_address (frame);
208 arg_value = read_memory_integer (argsaddr + start,
209 sizeof (int), byte_order);
211 fprintf_filtered (stream, ", ");
212 fprintf_filtered (stream, "%ld", arg_value);
214 start += sizeof (int);
218 /* Print single argument of inferior function. ARG must be already
221 Errors are printed as if they would be the parameter value. Use zeroed ARG
222 iff it should not be printed accoring to user settings. */
225 print_frame_arg (const struct frame_arg *arg)
227 struct ui_out *uiout = current_uiout;
228 const char *error_message = NULL;
232 gdb_assert (!arg->val || !arg->error);
233 gdb_assert (arg->entry_kind == print_entry_values_no
234 || arg->entry_kind == print_entry_values_only
235 || (!uiout->is_mi_like_p ()
236 && arg->entry_kind == print_entry_values_compact));
238 annotate_arg_emitter arg_emitter;
239 ui_out_emit_tuple tuple_emitter (uiout, NULL);
240 fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym),
241 SYMBOL_LANGUAGE (arg->sym), DMGL_PARAMS | DMGL_ANSI);
242 if (arg->entry_kind == print_entry_values_compact)
244 /* It is OK to provide invalid MI-like stream as with
245 PRINT_ENTRY_VALUE_COMPACT we never use MI. */
248 fprintf_symbol_filtered (&stb, SYMBOL_PRINT_NAME (arg->sym),
249 SYMBOL_LANGUAGE (arg->sym),
250 DMGL_PARAMS | DMGL_ANSI);
252 if (arg->entry_kind == print_entry_values_only
253 || arg->entry_kind == print_entry_values_compact)
255 uiout->field_stream ("name", stb);
256 annotate_arg_name_end ();
259 if (!arg->val && !arg->error)
264 error_message = arg->error;
269 const struct language_defn *language;
270 struct value_print_options opts;
272 /* Avoid value_print because it will deref ref parameters. We
273 just want to print their addresses. Print ??? for args whose
274 address we do not know. We pass 2 as "recurse" to val_print
275 because our standard indentation here is 4 spaces, and
276 val_print indents 2 for each recurse. */
278 annotate_arg_value (value_type (arg->val));
280 /* Use the appropriate language to display our symbol, unless the
281 user forced the language to a specific language. */
282 if (language_mode == language_mode_auto)
283 language = language_def (SYMBOL_LANGUAGE (arg->sym));
285 language = current_language;
287 get_no_prettyformat_print_options (&opts);
289 opts.raw = print_raw_frame_arguments;
291 /* True in "summary" mode, false otherwise. */
292 opts.summary = !strcmp (print_frame_arguments, "scalars");
294 common_val_print (arg->val, &stb, 2, &opts, language);
296 CATCH (except, RETURN_MASK_ERROR)
298 error_message = except.message;
302 if (error_message != NULL)
303 stb.printf (_("<error reading variable: %s>"), error_message);
306 uiout->field_stream ("value", stb);
309 /* Read in inferior function local SYM at FRAME into ARGP. Caller is
310 responsible for xfree of ARGP->ERROR. This function never throws an
314 read_frame_local (struct symbol *sym, struct frame_info *frame,
315 struct frame_arg *argp)
323 argp->val = read_var_value (sym, NULL, frame);
325 CATCH (except, RETURN_MASK_ERROR)
327 argp->error = xstrdup (except.message);
332 /* Read in inferior function parameter SYM at FRAME into ARGP. Caller is
333 responsible for xfree of ARGP->ERROR. This function never throws an
337 read_frame_arg (struct symbol *sym, struct frame_info *frame,
338 struct frame_arg *argp, struct frame_arg *entryargp)
340 struct value *val = NULL, *entryval = NULL;
341 char *val_error = NULL, *entryval_error = NULL;
344 if (print_entry_values != print_entry_values_only
345 && print_entry_values != print_entry_values_preferred)
349 val = read_var_value (sym, NULL, frame);
351 CATCH (except, RETURN_MASK_ERROR)
353 val_error = (char *) alloca (strlen (except.message) + 1);
354 strcpy (val_error, except.message);
359 if (SYMBOL_COMPUTED_OPS (sym) != NULL
360 && SYMBOL_COMPUTED_OPS (sym)->read_variable_at_entry != NULL
361 && print_entry_values != print_entry_values_no
362 && (print_entry_values != print_entry_values_if_needed
363 || !val || value_optimized_out (val)))
367 const struct symbol_computed_ops *ops;
369 ops = SYMBOL_COMPUTED_OPS (sym);
370 entryval = ops->read_variable_at_entry (sym, frame);
372 CATCH (except, RETURN_MASK_ERROR)
374 if (except.error != NO_ENTRY_VALUE_ERROR)
376 entryval_error = (char *) alloca (strlen (except.message) + 1);
377 strcpy (entryval_error, except.message);
382 if (entryval != NULL && value_optimized_out (entryval))
385 if (print_entry_values == print_entry_values_compact
386 || print_entry_values == print_entry_values_default)
388 /* For MI do not try to use print_entry_values_compact for ARGP. */
390 if (val && entryval && !current_uiout->is_mi_like_p ())
392 struct type *type = value_type (val);
394 if (value_lazy (val))
395 value_fetch_lazy (val);
396 if (value_lazy (entryval))
397 value_fetch_lazy (entryval);
399 if (value_contents_eq (val, 0, entryval, 0, TYPE_LENGTH (type)))
401 /* Initialize it just to avoid a GCC false warning. */
402 struct value *val_deref = NULL, *entryval_deref;
404 /* DW_AT_call_value does match with the current
405 value. If it is a reference still try to verify if
406 dereferenced DW_AT_call_data_value does not differ. */
410 struct type *type_deref;
412 val_deref = coerce_ref (val);
413 if (value_lazy (val_deref))
414 value_fetch_lazy (val_deref);
415 type_deref = value_type (val_deref);
417 entryval_deref = coerce_ref (entryval);
418 if (value_lazy (entryval_deref))
419 value_fetch_lazy (entryval_deref);
421 /* If the reference addresses match but dereferenced
422 content does not match print them. */
424 && value_contents_eq (val_deref, 0,
426 TYPE_LENGTH (type_deref)))
429 CATCH (except, RETURN_MASK_ERROR)
431 /* If the dereferenced content could not be
432 fetched do not display anything. */
433 if (except.error == NO_ENTRY_VALUE_ERROR)
435 else if (except.message != NULL)
437 entryval_error = (char *) alloca (strlen (except.message) + 1);
438 strcpy (entryval_error, except.message);
443 /* Value was not a reference; and its content matches. */
444 if (val == val_deref)
452 /* Try to remove possibly duplicate error message for ENTRYARGP even
455 if (val_error && entryval_error
456 && strcmp (val_error, entryval_error) == 0)
458 entryval_error = NULL;
460 /* Do not se VAL_EQUAL as the same error message may be shown for
461 the entry value even if no entry values are present in the
467 if (entryval == NULL)
469 if (print_entry_values == print_entry_values_preferred)
471 gdb_assert (val == NULL);
475 val = read_var_value (sym, NULL, frame);
477 CATCH (except, RETURN_MASK_ERROR)
479 val_error = (char *) alloca (strlen (except.message) + 1);
480 strcpy (val_error, except.message);
484 if (print_entry_values == print_entry_values_only
485 || print_entry_values == print_entry_values_both
486 || (print_entry_values == print_entry_values_preferred
487 && (!val || value_optimized_out (val))))
489 entryval = allocate_optimized_out_value (SYMBOL_TYPE (sym));
490 entryval_error = NULL;
493 if ((print_entry_values == print_entry_values_compact
494 || print_entry_values == print_entry_values_if_needed
495 || print_entry_values == print_entry_values_preferred)
496 && (!val || value_optimized_out (val)) && entryval != NULL)
504 argp->error = val_error ? xstrdup (val_error) : NULL;
505 if (!val && !val_error)
506 argp->entry_kind = print_entry_values_only;
507 else if ((print_entry_values == print_entry_values_compact
508 || print_entry_values == print_entry_values_default) && val_equal)
510 argp->entry_kind = print_entry_values_compact;
511 gdb_assert (!current_uiout->is_mi_like_p ());
514 argp->entry_kind = print_entry_values_no;
516 entryargp->sym = sym;
517 entryargp->val = entryval;
518 entryargp->error = entryval_error ? xstrdup (entryval_error) : NULL;
519 if (!entryval && !entryval_error)
520 entryargp->entry_kind = print_entry_values_no;
522 entryargp->entry_kind = print_entry_values_only;
525 /* Print the arguments of frame FRAME on STREAM, given the function
526 FUNC running in that frame (as a symbol), where NUM is the number
527 of arguments according to the stack frame (or -1 if the number of
528 arguments is unknown). */
530 /* Note that currently the "number of arguments according to the
531 stack frame" is only known on VAX where i refers to the "number of
532 ints of arguments according to the stack frame". */
535 print_frame_args (struct symbol *func, struct frame_info *frame,
536 int num, struct ui_file *stream)
538 struct ui_out *uiout = current_uiout;
540 /* Offset of next stack argument beyond the one we have seen that is
541 at the highest offset, or -1 if we haven't come to a stack
543 long highest_offset = -1;
544 /* Number of ints of arguments that we have printed so far. */
545 int args_printed = 0;
546 /* True if we should print arguments, false otherwise. */
547 int print_args = strcmp (print_frame_arguments, "none");
551 const struct block *b = SYMBOL_BLOCK_VALUE (func);
552 struct block_iterator iter;
555 ALL_BLOCK_SYMBOLS (b, iter, sym)
557 struct frame_arg arg, entryarg;
561 /* Keep track of the highest stack argument offset seen, and
562 skip over any kinds of symbols we don't care about. */
564 if (!SYMBOL_IS_ARGUMENT (sym))
567 switch (SYMBOL_CLASS (sym))
572 long current_offset = SYMBOL_VALUE (sym);
573 int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
575 /* Compute address of next argument by adding the size of
576 this argument and rounding to an int boundary. */
578 ((current_offset + arg_size + sizeof (int) - 1)
579 & ~(sizeof (int) - 1));
581 /* If this is the highest offset seen yet, set
583 if (highest_offset == -1
584 || (current_offset > highest_offset))
585 highest_offset = current_offset;
587 /* Add the number of ints we're about to print to
589 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
592 /* We care about types of symbols, but don't need to
593 keep track of stack offsets in them. */
595 case LOC_REGPARM_ADDR:
597 case LOC_OPTIMIZED_OUT:
602 /* We have to look up the symbol because arguments can have
603 two entries (one a parameter, one a local) and the one we
604 want is the local, which lookup_symbol will find for us.
605 This includes gcc1 (not gcc2) on SPARC when passing a
606 small structure and gcc2 when the argument type is float
607 and it is passed as a double and converted to float by
608 the prologue (in the latter case the type of the LOC_ARG
609 symbol is double and the type of the LOC_LOCAL symbol is
611 /* But if the parameter name is null, don't try it. Null
612 parameter names occur on the RS/6000, for traceback
613 tables. FIXME, should we even print them? */
615 if (*SYMBOL_LINKAGE_NAME (sym))
619 nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
620 b, VAR_DOMAIN, NULL).symbol;
621 gdb_assert (nsym != NULL);
622 if (SYMBOL_CLASS (nsym) == LOC_REGISTER
623 && !SYMBOL_IS_ARGUMENT (nsym))
625 /* There is a LOC_ARG/LOC_REGISTER pair. This means
626 that it was passed on the stack and loaded into a
627 register, or passed in a register and stored in a
628 stack slot. GDB 3.x used the LOC_ARG; GDB
629 4.0-4.11 used the LOC_REGISTER.
631 Reasons for using the LOC_ARG:
633 (1) Because find_saved_registers may be slow for
636 (2) Because registers are often re-used and stack
637 slots rarely (never?) are. Therefore using
638 the stack slot is much less likely to print
641 Reasons why we might want to use the LOC_REGISTER:
643 (1) So that the backtrace prints the same value
644 as "print foo". I see no compelling reason
645 why this needs to be the case; having the
646 backtrace print the value which was passed
647 in, and "print foo" print the value as
648 modified within the called function, makes
651 Additional note: It might be nice if "info args"
652 displayed both values.
654 One more note: There is a case with SPARC
655 structure passing where we need to use the
656 LOC_REGISTER, but this is dealt with by creating
657 a single LOC_REGPARM in symbol reading. */
659 /* Leave sym (the LOC_ARG) alone. */
666 /* Print the current arg. */
669 uiout->wrap_hint (" ");
673 memset (&arg, 0, sizeof (arg));
675 arg.entry_kind = print_entry_values_no;
676 memset (&entryarg, 0, sizeof (entryarg));
678 entryarg.entry_kind = print_entry_values_no;
681 read_frame_arg (sym, frame, &arg, &entryarg);
683 if (arg.entry_kind != print_entry_values_only)
684 print_frame_arg (&arg);
686 if (entryarg.entry_kind != print_entry_values_no)
688 if (arg.entry_kind != print_entry_values_only)
691 uiout->wrap_hint (" ");
694 print_frame_arg (&entryarg);
698 xfree (entryarg.error);
704 /* Don't print nameless args in situations where we don't know
705 enough about the stack to find them. */
710 if (highest_offset == -1)
711 start = gdbarch_frame_args_skip (get_frame_arch (frame));
713 start = highest_offset;
715 print_frame_nameless_args (frame, start, num - args_printed,
720 /* Set the current source and line to the location given by frame
721 FRAME, if possible. When CENTER is true, adjust so the relevant
722 line is in the center of the next 'list'. */
725 set_current_sal_from_frame (struct frame_info *frame)
727 symtab_and_line sal = find_frame_sal (frame);
728 if (sal.symtab != NULL)
729 set_current_source_symtab_and_line (sal);
732 /* If ON, GDB will display disassembly of the next source line when
733 execution of the program being debugged stops.
734 If AUTO (which is the default), or there's no line info to determine
735 the source line of the next instruction, display disassembly of next
736 instruction instead. */
738 static enum auto_boolean disassemble_next_line;
741 show_disassemble_next_line (struct ui_file *file, int from_tty,
742 struct cmd_list_element *c,
745 fprintf_filtered (file,
746 _("Debugger's willingness to use "
747 "disassemble-next-line is %s.\n"),
751 /* Use TRY_CATCH to catch the exception from the gdb_disassembly
752 because it will be broken by filter sometime. */
755 do_gdb_disassembly (struct gdbarch *gdbarch,
756 int how_many, CORE_ADDR low, CORE_ADDR high)
761 gdb_disassembly (gdbarch, current_uiout,
762 DISASSEMBLY_RAW_INSN, how_many,
765 CATCH (exception, RETURN_MASK_ERROR)
767 /* If an exception was thrown while doing the disassembly, print
768 the error message, to give the user a clue of what happened. */
769 exception_print (gdb_stderr, exception);
774 /* Print information about frame FRAME. The output is format according
775 to PRINT_LEVEL and PRINT_WHAT and PRINT_ARGS. The meaning of
778 SRC_LINE: Print only source line.
779 LOCATION: Print only location.
780 LOC_AND_SRC: Print location and source line.
782 Used in "where" output, and to emit breakpoint or step
786 print_frame_info (struct frame_info *frame, int print_level,
787 enum print_what print_what, int print_args,
790 struct gdbarch *gdbarch = get_frame_arch (frame);
793 struct ui_out *uiout = current_uiout;
795 if (get_frame_type (frame) == DUMMY_FRAME
796 || get_frame_type (frame) == SIGTRAMP_FRAME
797 || get_frame_type (frame) == ARCH_FRAME)
799 ui_out_emit_tuple tuple_emitter (uiout, "frame");
801 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
802 gdbarch, get_frame_pc (frame));
804 /* Do this regardless of SOURCE because we don't have any source
805 to list for this frame. */
809 uiout->field_fmt_int (2, ui_left, "level",
810 frame_relative_level (frame));
812 if (uiout->is_mi_like_p ())
814 annotate_frame_address ();
815 uiout->field_core_addr ("addr",
816 gdbarch, get_frame_pc (frame));
817 annotate_frame_address_end ();
820 if (get_frame_type (frame) == DUMMY_FRAME)
822 annotate_function_call ();
823 uiout->field_string ("func", "<function called from gdb>");
825 else if (get_frame_type (frame) == SIGTRAMP_FRAME)
827 annotate_signal_handler_caller ();
828 uiout->field_string ("func", "<signal handler called>");
830 else if (get_frame_type (frame) == ARCH_FRAME)
832 uiout->field_string ("func", "<cross-architecture call>");
835 annotate_frame_end ();
837 /* If disassemble-next-line is set to auto or on output the next
839 if (disassemble_next_line == AUTO_BOOLEAN_AUTO
840 || disassemble_next_line == AUTO_BOOLEAN_TRUE)
841 do_gdb_disassembly (get_frame_arch (frame), 1,
842 get_frame_pc (frame), get_frame_pc (frame) + 1);
847 /* If FRAME is not the innermost frame, that normally means that
848 FRAME->pc points to *after* the call instruction, and we want to
849 get the line containing the call, never the next line. But if
850 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
851 next frame was not entered as the result of a call, and we want
852 to get the line containing FRAME->pc. */
853 symtab_and_line sal = find_frame_sal (frame);
855 location_print = (print_what == LOCATION
856 || print_what == LOC_AND_ADDRESS
857 || print_what == SRC_AND_LOC);
859 if (location_print || !sal.symtab)
860 print_frame (frame, print_level, print_what, print_args, sal);
862 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
864 /* If disassemble-next-line is set to auto or on and doesn't have
865 the line debug messages for $pc, output the next instruction. */
866 if ((disassemble_next_line == AUTO_BOOLEAN_AUTO
867 || disassemble_next_line == AUTO_BOOLEAN_TRUE)
868 && source_print && !sal.symtab)
869 do_gdb_disassembly (get_frame_arch (frame), 1,
870 get_frame_pc (frame), get_frame_pc (frame) + 1);
872 if (source_print && sal.symtab)
875 int mid_statement = ((print_what == SRC_LINE)
876 && frame_show_address (frame, sal));
878 if (annotation_level)
879 done = identify_source_line (sal.symtab, sal.line, mid_statement,
880 get_frame_pc (frame));
883 if (deprecated_print_frame_info_listing_hook)
884 deprecated_print_frame_info_listing_hook (sal.symtab,
889 struct value_print_options opts;
891 get_user_print_options (&opts);
892 /* We used to do this earlier, but that is clearly
893 wrong. This function is used by many different
894 parts of gdb, including normal_stop in infrun.c,
895 which uses this to print out the current PC
896 when we stepi/nexti into the middle of a source
897 line. Only the command line really wants this
898 behavior. Other UIs probably would like the
899 ability to decide for themselves if it is desired. */
900 if (opts.addressprint && mid_statement)
902 uiout->field_core_addr ("addr",
903 gdbarch, get_frame_pc (frame));
907 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
911 /* If disassemble-next-line is set to on and there is line debug
912 messages, output assembly codes for next line. */
913 if (disassemble_next_line == AUTO_BOOLEAN_TRUE)
914 do_gdb_disassembly (get_frame_arch (frame), -1, sal.pc, sal.end);
921 if (get_frame_pc_if_available (frame, &pc))
922 set_last_displayed_sal (1, sal.pspace, pc, sal.symtab, sal.line);
924 set_last_displayed_sal (0, 0, 0, 0, 0);
927 annotate_frame_end ();
929 gdb_flush (gdb_stdout);
932 /* Remember the last symtab and line we displayed, which we use e.g.
933 * as the place to put a breakpoint when the `break' command is
934 * invoked with no arguments. */
937 set_last_displayed_sal (int valid, struct program_space *pspace,
938 CORE_ADDR addr, struct symtab *symtab,
941 last_displayed_sal_valid = valid;
942 last_displayed_pspace = pspace;
943 last_displayed_addr = addr;
944 last_displayed_symtab = symtab;
945 last_displayed_line = line;
946 if (valid && pspace == NULL)
948 clear_last_displayed_sal ();
949 internal_error (__FILE__, __LINE__,
950 _("Trying to set NULL pspace."));
954 /* Forget the last sal we displayed. */
957 clear_last_displayed_sal (void)
959 last_displayed_sal_valid = 0;
960 last_displayed_pspace = 0;
961 last_displayed_addr = 0;
962 last_displayed_symtab = 0;
963 last_displayed_line = 0;
966 /* Is our record of the last sal we displayed valid? If not,
967 * the get_last_displayed_* functions will return NULL or 0, as
971 last_displayed_sal_is_valid (void)
973 return last_displayed_sal_valid;
976 /* Get the pspace of the last sal we displayed, if it's valid. */
978 struct program_space *
979 get_last_displayed_pspace (void)
981 if (last_displayed_sal_valid)
982 return last_displayed_pspace;
986 /* Get the address of the last sal we displayed, if it's valid. */
989 get_last_displayed_addr (void)
991 if (last_displayed_sal_valid)
992 return last_displayed_addr;
996 /* Get the symtab of the last sal we displayed, if it's valid. */
999 get_last_displayed_symtab (void)
1001 if (last_displayed_sal_valid)
1002 return last_displayed_symtab;
1006 /* Get the line of the last sal we displayed, if it's valid. */
1009 get_last_displayed_line (void)
1011 if (last_displayed_sal_valid)
1012 return last_displayed_line;
1016 /* Get the last sal we displayed, if it's valid. */
1019 get_last_displayed_sal ()
1021 symtab_and_line sal;
1023 if (last_displayed_sal_valid)
1025 sal.pspace = last_displayed_pspace;
1026 sal.pc = last_displayed_addr;
1027 sal.symtab = last_displayed_symtab;
1028 sal.line = last_displayed_line;
1035 /* Attempt to obtain the FUNNAME, FUNLANG and optionally FUNCP of the function
1036 corresponding to FRAME. FUNNAME needs to be freed by the caller. */
1039 find_frame_funname (struct frame_info *frame, char **funname,
1040 enum language *funlang, struct symbol **funcp)
1042 struct symbol *func;
1045 *funlang = language_unknown;
1049 func = get_frame_function (frame);
1052 /* In certain pathological cases, the symtabs give the wrong
1053 function (when we are in the first function in a file which
1054 is compiled without debugging symbols, the previous function
1055 is compiled with debugging symbols, and the "foo.o" symbol
1056 that is supposed to tell us where the file with debugging
1057 symbols ends has been truncated by ar because it is longer
1058 than 15 characters). This also occurs if the user uses asm()
1059 to create a function but not stabs for it (in a file compiled
1062 So look in the minimal symbol tables as well, and if it comes
1063 up with a larger address for the function use that instead.
1064 I don't think this can ever cause any problems; there
1065 shouldn't be any minimal symbols in the middle of a function;
1066 if this is ever changed many parts of GDB will need to be
1067 changed (and we'll create a find_pc_minimal_function or some
1070 struct bound_minimal_symbol msymbol;
1072 /* Don't attempt to do this for inlined functions, which do not
1073 have a corresponding minimal symbol. */
1074 if (!block_inlined_p (SYMBOL_BLOCK_VALUE (func)))
1076 = lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
1078 memset (&msymbol, 0, sizeof (msymbol));
1080 if (msymbol.minsym != NULL
1081 && (BMSYMBOL_VALUE_ADDRESS (msymbol)
1082 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
1084 /* We also don't know anything about the function besides
1085 its address and name. */
1087 *funname = xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym));
1088 *funlang = MSYMBOL_LANGUAGE (msymbol.minsym);
1092 const char *print_name = SYMBOL_PRINT_NAME (func);
1094 *funlang = SYMBOL_LANGUAGE (func);
1097 if (*funlang == language_cplus)
1099 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
1100 to display the demangled name that we already have
1101 stored in the symbol table, but we stored a version
1102 with DMGL_PARAMS turned on, and here we don't want to
1103 display parameters. So remove the parameters. */
1104 char *func_only = cp_remove_params (print_name);
1107 *funname = func_only;
1110 /* If we didn't hit the C++ case above, set *funname here.
1111 This approach is taken to avoid having to install a
1112 cleanup in case cp_remove_params can throw. */
1113 if (*funname == NULL)
1114 *funname = xstrdup (print_name);
1119 struct bound_minimal_symbol msymbol;
1122 if (!get_frame_address_in_block_if_available (frame, &pc))
1125 msymbol = lookup_minimal_symbol_by_pc (pc);
1126 if (msymbol.minsym != NULL)
1128 *funname = xstrdup (MSYMBOL_PRINT_NAME (msymbol.minsym));
1129 *funlang = MSYMBOL_LANGUAGE (msymbol.minsym);
1135 print_frame (struct frame_info *frame, int print_level,
1136 enum print_what print_what, int print_args,
1137 struct symtab_and_line sal)
1139 struct gdbarch *gdbarch = get_frame_arch (frame);
1140 struct ui_out *uiout = current_uiout;
1141 char *funname = NULL;
1142 enum language funlang = language_unknown;
1143 struct cleanup *old_chain;
1144 struct value_print_options opts;
1145 struct symbol *func;
1149 pc_p = get_frame_pc_if_available (frame, &pc);
1152 find_frame_funname (frame, &funname, &funlang, &func);
1153 old_chain = make_cleanup (xfree, funname);
1155 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
1159 ui_out_emit_tuple tuple_emitter (uiout, "frame");
1164 uiout->field_fmt_int (2, ui_left, "level",
1165 frame_relative_level (frame));
1167 get_user_print_options (&opts);
1168 if (opts.addressprint)
1170 || frame_show_address (frame, sal)
1171 || print_what == LOC_AND_ADDRESS)
1173 annotate_frame_address ();
1175 uiout->field_core_addr ("addr", gdbarch, pc);
1177 uiout->field_string ("addr", "<unavailable>");
1178 annotate_frame_address_end ();
1179 uiout->text (" in ");
1181 annotate_frame_function_name ();
1184 fprintf_symbol_filtered (&stb, funname ? funname : "??",
1185 funlang, DMGL_ANSI);
1186 uiout->field_stream ("func", stb);
1187 uiout->wrap_hint (" ");
1188 annotate_frame_args ();
1193 struct gdbarch *gdbarch = get_frame_arch (frame);
1196 if (gdbarch_frame_num_args_p (gdbarch))
1198 numargs = gdbarch_frame_num_args (gdbarch, frame);
1199 gdb_assert (numargs >= 0);
1205 ui_out_emit_list list_emitter (uiout, "args");
1208 print_frame_args (func, frame, numargs, gdb_stdout);
1210 CATCH (e, RETURN_MASK_ERROR)
1215 /* FIXME: ARGS must be a list. If one argument is a string it
1216 will have " that will not be properly escaped. */
1223 const char *filename_display;
1225 filename_display = symtab_to_filename_for_display (sal.symtab);
1226 annotate_frame_source_begin ();
1227 uiout->wrap_hint (" ");
1228 uiout->text (" at ");
1229 annotate_frame_source_file ();
1230 uiout->field_string ("file", filename_display);
1231 if (uiout->is_mi_like_p ())
1233 const char *fullname = symtab_to_fullname (sal.symtab);
1235 uiout->field_string ("fullname", fullname);
1237 annotate_frame_source_file_end ();
1239 annotate_frame_source_line ();
1240 uiout->field_int ("line", sal.line);
1241 annotate_frame_source_end ();
1244 if (pc_p && (funname == NULL || sal.symtab == NULL))
1246 char *lib = solib_name_from_address (get_frame_program_space (frame),
1247 get_frame_pc (frame));
1251 annotate_frame_where ();
1252 uiout->wrap_hint (" ");
1253 uiout->text (" from ");
1254 uiout->field_string ("from", lib);
1260 do_cleanups (old_chain);
1264 /* Read a frame specification in whatever the appropriate format is from
1265 FRAME_EXP. Call error() if the specification is in any way invalid (so
1266 this function never returns NULL). When SELECTED_FRAME_P is non-NULL
1267 set its target to indicate that the default selected frame was used. */
1269 static struct frame_info *
1270 parse_frame_specification (const char *frame_exp, int *selected_frame_p)
1273 struct value *args[4];
1274 CORE_ADDR addrs[ARRAY_SIZE (args)];
1276 if (frame_exp == NULL)
1284 struct cleanup *cleanup;
1287 /* Skip leading white space, bail of EOL. */
1288 frame_exp = skip_spaces (frame_exp);
1292 /* Parse the argument, extract it, save it. */
1294 *p && !ISSPACE (*p);
1296 addr_string = savestring (frame_exp, p - frame_exp);
1298 cleanup = make_cleanup (xfree, addr_string);
1300 /* NOTE: Parse and evaluate expression, but do not use
1301 functions such as parse_and_eval_long or
1302 parse_and_eval_address to also extract the value.
1303 Instead value_as_long and value_as_address are used.
1304 This avoids problems with expressions that contain
1306 if (numargs >= ARRAY_SIZE (args))
1307 error (_("Too many args in frame specification"));
1308 args[numargs++] = parse_and_eval (addr_string);
1310 do_cleanups (cleanup);
1314 /* If no args, default to the selected frame. */
1317 if (selected_frame_p != NULL)
1318 (*selected_frame_p) = 1;
1319 return get_selected_frame (_("No stack."));
1322 /* None of the remaining use the selected frame. */
1323 if (selected_frame_p != NULL)
1324 (*selected_frame_p) = 0;
1326 /* Assume the single arg[0] is an integer, and try using that to
1327 select a frame relative to current. */
1330 struct frame_info *fid;
1331 int level = value_as_long (args[0]);
1333 fid = find_relative_frame (get_current_frame (), &level);
1335 /* find_relative_frame was successful. */
1339 /* Convert each value into a corresponding address. */
1343 for (i = 0; i < numargs; i++)
1344 addrs[i] = value_as_address (args[i]);
1347 /* Assume that the single arg[0] is an address, use that to identify
1348 a frame with a matching ID. Should this also accept stack/pc or
1349 stack/pc/special. */
1352 struct frame_id id = frame_id_build_wild (addrs[0]);
1353 struct frame_info *fid;
1355 /* If (s)he specifies the frame with an address, he deserves
1356 what (s)he gets. Still, give the highest one that matches.
1357 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
1359 for (fid = get_current_frame ();
1361 fid = get_prev_frame (fid))
1363 if (frame_id_eq (id, get_frame_id (fid)))
1365 struct frame_info *prev_frame;
1369 prev_frame = get_prev_frame (fid);
1371 || !frame_id_eq (id, get_frame_id (prev_frame)))
1380 /* We couldn't identify the frame as an existing frame, but
1381 perhaps we can create one with a single argument. */
1383 return create_new_frame (addrs[0], 0);
1384 else if (numargs == 2)
1385 return create_new_frame (addrs[0], addrs[1]);
1387 error (_("Too many args in frame specification"));
1390 /* Print verbosely the selected frame or the frame at address
1391 ADDR_EXP. Absolutely all information in the frame is printed. */
1394 info_frame_command (char *addr_exp, int from_tty)
1396 struct frame_info *fi;
1397 struct symbol *func;
1399 struct frame_info *calling_frame_info;
1401 const char *funname = 0;
1402 enum language funlang = language_unknown;
1403 const char *pc_regname;
1404 int selected_frame_p;
1405 struct gdbarch *gdbarch;
1406 struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
1409 /* Initialize it to avoid "may be used uninitialized" warning. */
1410 CORE_ADDR caller_pc = 0;
1411 int caller_pc_p = 0;
1413 fi = parse_frame_specification (addr_exp, &selected_frame_p);
1414 gdbarch = get_frame_arch (fi);
1416 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
1417 is not a good name. */
1418 if (gdbarch_pc_regnum (gdbarch) >= 0)
1419 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
1420 easily not match that of the internal value returned by
1422 pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch));
1424 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
1425 architectures will often have a hardware register called "pc",
1426 and that register's value, again, can easily not match
1430 frame_pc_p = get_frame_pc_if_available (fi, &frame_pc);
1431 func = get_frame_function (fi);
1432 symtab_and_line sal = find_frame_sal (fi);
1436 funname = SYMBOL_PRINT_NAME (func);
1437 funlang = SYMBOL_LANGUAGE (func);
1438 if (funlang == language_cplus)
1440 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
1441 to display the demangled name that we already have
1442 stored in the symbol table, but we stored a version
1443 with DMGL_PARAMS turned on, and here we don't want to
1444 display parameters. So remove the parameters. */
1445 char *func_only = cp_remove_params (funname);
1449 funname = func_only;
1450 make_cleanup (xfree, func_only);
1454 else if (frame_pc_p)
1456 struct bound_minimal_symbol msymbol;
1458 msymbol = lookup_minimal_symbol_by_pc (frame_pc);
1459 if (msymbol.minsym != NULL)
1461 funname = MSYMBOL_PRINT_NAME (msymbol.minsym);
1462 funlang = MSYMBOL_LANGUAGE (msymbol.minsym);
1465 calling_frame_info = get_prev_frame (fi);
1467 if (selected_frame_p && frame_relative_level (fi) >= 0)
1469 printf_filtered (_("Stack level %d, frame at "),
1470 frame_relative_level (fi));
1474 printf_filtered (_("Stack frame at "));
1476 fputs_filtered (paddress (gdbarch, get_frame_base (fi)), gdb_stdout);
1477 printf_filtered (":\n");
1478 printf_filtered (" %s = ", pc_regname);
1480 fputs_filtered (paddress (gdbarch, get_frame_pc (fi)), gdb_stdout);
1482 fputs_filtered ("<unavailable>", gdb_stdout);
1487 printf_filtered (" in ");
1488 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
1489 DMGL_ANSI | DMGL_PARAMS);
1493 printf_filtered (" (%s:%d)", symtab_to_filename_for_display (sal.symtab),
1495 puts_filtered ("; ");
1497 printf_filtered ("saved %s = ", pc_regname);
1499 if (!frame_id_p (frame_unwind_caller_id (fi)))
1500 val_print_not_saved (gdb_stdout);
1505 caller_pc = frame_unwind_caller_pc (fi);
1508 CATCH (ex, RETURN_MASK_ERROR)
1512 case NOT_AVAILABLE_ERROR:
1513 val_print_unavailable (gdb_stdout);
1515 case OPTIMIZED_OUT_ERROR:
1516 val_print_not_saved (gdb_stdout);
1519 fprintf_filtered (gdb_stdout, _("<error: %s>"), ex.message);
1527 fputs_filtered (paddress (gdbarch, caller_pc), gdb_stdout);
1528 printf_filtered ("\n");
1530 if (calling_frame_info == NULL)
1532 enum unwind_stop_reason reason;
1534 reason = get_frame_unwind_stop_reason (fi);
1535 if (reason != UNWIND_NO_REASON)
1536 printf_filtered (_(" Outermost frame: %s\n"),
1537 frame_stop_reason_string (fi));
1539 else if (get_frame_type (fi) == TAILCALL_FRAME)
1540 puts_filtered (" tail call frame");
1541 else if (get_frame_type (fi) == INLINE_FRAME)
1542 printf_filtered (" inlined into frame %d",
1543 frame_relative_level (get_prev_frame (fi)));
1546 printf_filtered (" called by frame at ");
1547 fputs_filtered (paddress (gdbarch, get_frame_base (calling_frame_info)),
1550 if (get_next_frame (fi) && calling_frame_info)
1551 puts_filtered (",");
1553 if (get_next_frame (fi))
1555 printf_filtered (" caller of frame at ");
1556 fputs_filtered (paddress (gdbarch, get_frame_base (get_next_frame (fi))),
1559 if (get_next_frame (fi) || calling_frame_info)
1560 puts_filtered ("\n");
1563 printf_filtered (" source language %s.\n",
1564 language_str (s->language));
1567 /* Address of the argument list for this frame, or 0. */
1568 CORE_ADDR arg_list = get_frame_args_address (fi);
1569 /* Number of args for this frame, or -1 if unknown. */
1573 printf_filtered (" Arglist at unknown address.\n");
1576 printf_filtered (" Arglist at ");
1577 fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout);
1578 printf_filtered (",");
1580 if (!gdbarch_frame_num_args_p (gdbarch))
1583 puts_filtered (" args: ");
1587 numargs = gdbarch_frame_num_args (gdbarch, fi);
1588 gdb_assert (numargs >= 0);
1590 puts_filtered (" no args.");
1591 else if (numargs == 1)
1592 puts_filtered (" 1 arg: ");
1594 printf_filtered (" %d args: ", numargs);
1596 print_frame_args (func, fi, numargs, gdb_stdout);
1597 puts_filtered ("\n");
1601 /* Address of the local variables for this frame, or 0. */
1602 CORE_ADDR arg_list = get_frame_locals_address (fi);
1605 printf_filtered (" Locals at unknown address,");
1608 printf_filtered (" Locals at ");
1609 fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout);
1610 printf_filtered (",");
1614 /* Print as much information as possible on the location of all the
1620 int sp_regnum = gdbarch_sp_regnum (gdbarch);
1622 /* The sp is special; what's displayed isn't the save address, but
1623 the value of the previous frame's sp. This is a legacy thing,
1624 at one stage the frame cached the previous frame's SP instead
1625 of its address, hence it was easiest to just display the cached
1629 struct value *value = frame_unwind_register_value (fi, sp_regnum);
1630 gdb_assert (value != NULL);
1632 if (!value_optimized_out (value) && value_entirely_available (value))
1634 if (VALUE_LVAL (value) == not_lval)
1637 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1638 int sp_size = register_size (gdbarch, sp_regnum);
1640 sp = extract_unsigned_integer (value_contents_all (value),
1641 sp_size, byte_order);
1643 printf_filtered (" Previous frame's sp is ");
1644 fputs_filtered (paddress (gdbarch, sp), gdb_stdout);
1645 printf_filtered ("\n");
1647 else if (VALUE_LVAL (value) == lval_memory)
1649 printf_filtered (" Previous frame's sp at ");
1650 fputs_filtered (paddress (gdbarch, value_address (value)),
1652 printf_filtered ("\n");
1654 else if (VALUE_LVAL (value) == lval_register)
1656 printf_filtered (" Previous frame's sp in %s\n",
1657 gdbarch_register_name (gdbarch,
1658 VALUE_REGNUM (value)));
1661 release_value (value);
1665 /* else keep quiet. */
1669 numregs = gdbarch_num_regs (gdbarch)
1670 + gdbarch_num_pseudo_regs (gdbarch);
1671 for (i = 0; i < numregs; i++)
1673 && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup))
1675 enum lval_type lval;
1681 /* Find out the location of the saved register without
1682 fetching the corresponding value. */
1683 frame_register_unwind (fi, i, &optimized, &unavailable,
1684 &lval, &addr, &realnum, NULL);
1685 /* For moment, only display registers that were saved on the
1687 if (!optimized && !unavailable && lval == lval_memory)
1690 puts_filtered (" Saved registers:\n ");
1692 puts_filtered (",");
1694 printf_filtered (" %s at ",
1695 gdbarch_register_name (gdbarch, i));
1696 fputs_filtered (paddress (gdbarch, addr), gdb_stdout);
1700 if (count || need_nl)
1701 puts_filtered ("\n");
1704 do_cleanups (back_to);
1707 /* Print briefly all stack frames or just the innermost COUNT_EXP
1711 backtrace_command_1 (char *count_exp, int show_locals, int no_filters,
1714 struct frame_info *fi;
1717 struct frame_info *trailing;
1718 int trailing_level, py_start = 0, py_end = 0;
1719 enum ext_lang_bt_status result = EXT_LANG_BT_ERROR;
1721 if (!target_has_stack)
1722 error (_("No stack."));
1724 /* The following code must do two things. First, it must set the
1725 variable TRAILING to the frame from which we should start
1726 printing. Second, it must set the variable count to the number
1727 of frames which we should print, or -1 if all of them. */
1728 trailing = get_current_frame ();
1733 count = parse_and_eval_long (count_exp);
1736 struct frame_info *current;
1742 while (current && count--)
1745 current = get_prev_frame (current);
1748 /* Will stop when CURRENT reaches the top of the stack.
1749 TRAILING will be COUNT below it. */
1753 trailing = get_prev_frame (trailing);
1754 current = get_prev_frame (current);
1774 /* Read in symbols for all of the frames. Need to do this in a
1775 separate pass so that "Reading in symbols for xxx" messages
1776 don't screw up the appearance of the backtrace. Also if
1777 people have strong opinions against reading symbols for
1778 backtrace this may have to be an option. */
1780 for (fi = trailing; fi != NULL && i--; fi = get_prev_frame (fi))
1785 pc = get_frame_address_in_block (fi);
1786 expand_symtab_containing_pc (pc, find_pc_mapped_section (pc));
1792 int flags = PRINT_LEVEL | PRINT_FRAME_INFO | PRINT_ARGS;
1793 enum ext_lang_frame_args arg_type;
1796 flags |= PRINT_LOCALS;
1798 if (!strcmp (print_frame_arguments, "scalars"))
1799 arg_type = CLI_SCALAR_VALUES;
1800 else if (!strcmp (print_frame_arguments, "all"))
1801 arg_type = CLI_ALL_VALUES;
1803 arg_type = NO_VALUES;
1805 result = apply_ext_lang_frame_filter (get_current_frame (), flags,
1806 arg_type, current_uiout,
1810 /* Run the inbuilt backtrace if there are no filters registered, or
1811 "no-filters" has been specified from the command. */
1812 if (no_filters || result == EXT_LANG_BT_NO_FILTERS)
1814 for (i = 0, fi = trailing; fi && count--; i++, fi = get_prev_frame (fi))
1818 /* Don't use print_stack_frame; if an error() occurs it probably
1819 means further attempts to backtrace would fail (on the other
1820 hand, perhaps the code does or could be fixed to make sure
1821 the frame->prev field gets set to NULL in that case). */
1823 print_frame_info (fi, 1, LOCATION, 1, 0);
1826 struct frame_id frame_id = get_frame_id (fi);
1828 print_frame_local_vars (fi, 1, gdb_stdout);
1830 /* print_frame_local_vars invalidates FI. */
1831 fi = frame_find_by_id (frame_id);
1835 warning (_("Unable to restore previously selected frame."));
1840 /* Save the last frame to check for error conditions. */
1844 /* If we've stopped before the end, mention that. */
1846 printf_filtered (_("(More stack frames follow...)\n"));
1848 /* If we've run out of frames, and the reason appears to be an error
1849 condition, print it. */
1850 if (fi == NULL && trailing != NULL)
1852 enum unwind_stop_reason reason;
1854 reason = get_frame_unwind_stop_reason (trailing);
1855 if (reason >= UNWIND_FIRST_ERROR)
1856 printf_filtered (_("Backtrace stopped: %s\n"),
1857 frame_stop_reason_string (trailing));
1863 backtrace_command (char *arg, int from_tty)
1865 struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
1866 int fulltrace_arg = -1, arglen = 0, argc = 0, no_filters = -1;
1874 gdb_argv built_argv (arg);
1875 argv = built_argv.get ();
1877 for (i = 0; argv[i]; i++)
1881 for (j = 0; j < strlen (argv[i]); j++)
1882 argv[i][j] = TOLOWER (argv[i][j]);
1884 if (no_filters < 0 && subset_compare (argv[i], "no-filters"))
1888 if (fulltrace_arg < 0 && subset_compare (argv[i], "full"))
1889 fulltrace_arg = argc;
1893 arglen += strlen (argv[i]);
1899 if (fulltrace_arg >= 0 || no_filters >= 0)
1903 arg = (char *) xmalloc (arglen + 1);
1904 make_cleanup (xfree, arg);
1906 for (i = 0; i < argc; i++)
1908 if (i != fulltrace_arg && i != no_filters)
1910 strcat (arg, argv[i]);
1920 backtrace_command_1 (arg, fulltrace_arg >= 0 /* show_locals */,
1921 no_filters >= 0 /* no frame-filters */, from_tty);
1923 do_cleanups (old_chain);
1926 /* Iterate over the local variables of a block B, calling CB with
1930 iterate_over_block_locals (const struct block *b,
1931 iterate_over_block_arg_local_vars_cb cb,
1934 struct block_iterator iter;
1937 ALL_BLOCK_SYMBOLS (b, iter, sym)
1939 switch (SYMBOL_CLASS (sym))
1945 if (SYMBOL_IS_ARGUMENT (sym))
1947 if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
1949 (*cb) (SYMBOL_PRINT_NAME (sym), sym, cb_data);
1953 /* Ignore symbols which are not locals. */
1960 /* Same, but print labels. */
1963 /* Commented out, as the code using this function has also been
1964 commented out. FIXME:brobecker/2009-01-13: Find out why the code
1965 was commented out in the first place. The discussion introducing
1966 this change (2007-12-04: Support lexical blocks and function bodies
1967 that occupy non-contiguous address ranges) did not explain why
1968 this change was made. */
1970 print_block_frame_labels (struct gdbarch *gdbarch, struct block *b,
1971 int *have_default, struct ui_file *stream)
1973 struct block_iterator iter;
1975 int values_printed = 0;
1977 ALL_BLOCK_SYMBOLS (b, iter, sym)
1979 if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0)
1985 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1987 struct symtab_and_line sal;
1988 struct value_print_options opts;
1990 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1992 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1993 get_user_print_options (&opts);
1994 if (opts.addressprint)
1996 fprintf_filtered (stream, " ");
1997 fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (sym)),
2000 fprintf_filtered (stream, " in file %s, line %d\n",
2001 sal.symtab->filename, sal.line);
2005 return values_printed;
2009 /* Iterate over all the local variables in block B, including all its
2010 superblocks, stopping when the top-level block is reached. */
2013 iterate_over_block_local_vars (const struct block *block,
2014 iterate_over_block_arg_local_vars_cb cb,
2019 iterate_over_block_locals (block, cb, cb_data);
2020 /* After handling the function's top-level block, stop. Don't
2021 continue to its superblock, the block of per-file
2023 if (BLOCK_FUNCTION (block))
2025 block = BLOCK_SUPERBLOCK (block);
2029 /* Data to be passed around in the calls to the locals and args
2032 struct print_variable_and_value_data
2034 struct frame_id frame_id;
2036 struct ui_file *stream;
2040 /* The callback for the locals and args iterators. */
2043 do_print_variable_and_value (const char *print_name,
2047 struct print_variable_and_value_data *p
2048 = (struct print_variable_and_value_data *) cb_data;
2049 struct frame_info *frame;
2051 frame = frame_find_by_id (p->frame_id);
2054 warning (_("Unable to restore previously selected frame."));
2058 print_variable_and_value (print_name, sym, frame, p->stream, p->num_tabs);
2060 /* print_variable_and_value invalidates FRAME. */
2063 p->values_printed = 1;
2066 /* Print all variables from the innermost up to the function block of FRAME.
2067 Print them with values to STREAM indented by NUM_TABS.
2069 This function will invalidate FRAME. */
2072 print_frame_local_vars (struct frame_info *frame, int num_tabs,
2073 struct ui_file *stream)
2075 struct print_variable_and_value_data cb_data;
2076 const struct block *block;
2078 struct gdb_exception except = exception_none;
2080 if (!get_frame_pc_if_available (frame, &pc))
2082 fprintf_filtered (stream,
2083 _("PC unavailable, cannot determine locals.\n"));
2087 block = get_frame_block (frame, 0);
2090 fprintf_filtered (stream, "No symbol table info available.\n");
2094 cb_data.frame_id = get_frame_id (frame);
2095 cb_data.num_tabs = 4 * num_tabs;
2096 cb_data.stream = stream;
2097 cb_data.values_printed = 0;
2099 /* Temporarily change the selected frame to the given FRAME.
2100 This allows routines that rely on the selected frame instead
2101 of being given a frame as parameter to use the correct frame. */
2102 select_frame (frame);
2106 iterate_over_block_local_vars (block,
2107 do_print_variable_and_value,
2110 CATCH (ex, RETURN_MASK_ALL)
2116 /* Restore the selected frame, and then rethrow if there was a problem. */
2117 select_frame (frame_find_by_id (cb_data.frame_id));
2118 if (except.reason < 0)
2119 throw_exception (except);
2121 /* do_print_variable_and_value invalidates FRAME. */
2124 if (!cb_data.values_printed)
2125 fprintf_filtered (stream, _("No locals.\n"));
2129 info_locals_command (char *args, int from_tty)
2131 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
2135 /* Iterate over all the argument variables in block B.
2137 Returns 1 if any argument was walked; 0 otherwise. */
2140 iterate_over_block_arg_vars (const struct block *b,
2141 iterate_over_block_arg_local_vars_cb cb,
2144 struct block_iterator iter;
2145 struct symbol *sym, *sym2;
2147 ALL_BLOCK_SYMBOLS (b, iter, sym)
2149 /* Don't worry about things which aren't arguments. */
2150 if (SYMBOL_IS_ARGUMENT (sym))
2152 /* We have to look up the symbol because arguments can have
2153 two entries (one a parameter, one a local) and the one we
2154 want is the local, which lookup_symbol will find for us.
2155 This includes gcc1 (not gcc2) on the sparc when passing a
2156 small structure and gcc2 when the argument type is float
2157 and it is passed as a double and converted to float by
2158 the prologue (in the latter case the type of the LOC_ARG
2159 symbol is double and the type of the LOC_LOCAL symbol is
2160 float). There are also LOC_ARG/LOC_REGISTER pairs which
2161 are not combined in symbol-reading. */
2163 sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
2164 b, VAR_DOMAIN, NULL).symbol;
2165 (*cb) (SYMBOL_PRINT_NAME (sym), sym2, cb_data);
2170 /* Print all argument variables of the function of FRAME.
2171 Print them with values to STREAM.
2173 This function will invalidate FRAME. */
2176 print_frame_arg_vars (struct frame_info *frame, struct ui_file *stream)
2178 struct print_variable_and_value_data cb_data;
2179 struct symbol *func;
2182 if (!get_frame_pc_if_available (frame, &pc))
2184 fprintf_filtered (stream, _("PC unavailable, cannot determine args.\n"));
2188 func = get_frame_function (frame);
2191 fprintf_filtered (stream, _("No symbol table info available.\n"));
2195 cb_data.frame_id = get_frame_id (frame);
2196 cb_data.num_tabs = 0;
2197 cb_data.stream = gdb_stdout;
2198 cb_data.values_printed = 0;
2200 iterate_over_block_arg_vars (SYMBOL_BLOCK_VALUE (func),
2201 do_print_variable_and_value, &cb_data);
2203 /* do_print_variable_and_value invalidates FRAME. */
2206 if (!cb_data.values_printed)
2207 fprintf_filtered (stream, _("No arguments.\n"));
2211 info_args_command (char *ignore, int from_tty)
2213 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
2217 /* Select frame FRAME. Also print the stack frame and show the source
2218 if this is the tui version. */
2220 select_and_print_frame (struct frame_info *frame)
2222 select_frame (frame);
2224 print_stack_frame (frame, 1, SRC_AND_LOC, 1);
2227 /* Return the symbol-block in which the selected frame is executing.
2228 Can return zero under various legitimate circumstances.
2230 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
2231 code address within the block returned. We use this to decide
2232 which macros are in scope. */
2234 const struct block *
2235 get_selected_block (CORE_ADDR *addr_in_block)
2237 if (!has_stack_frames ())
2240 return get_frame_block (get_selected_frame (NULL), addr_in_block);
2243 /* Find a frame a certain number of levels away from FRAME.
2244 LEVEL_OFFSET_PTR points to an int containing the number of levels.
2245 Positive means go to earlier frames (up); negative, the reverse.
2246 The int that contains the number of levels is counted toward
2247 zero as the frames for those levels are found.
2248 If the top or bottom frame is reached, that frame is returned,
2249 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
2250 how much farther the original request asked to go. */
2253 find_relative_frame (struct frame_info *frame, int *level_offset_ptr)
2255 /* Going up is simple: just call get_prev_frame enough times or
2256 until the initial frame is reached. */
2257 while (*level_offset_ptr > 0)
2259 struct frame_info *prev = get_prev_frame (frame);
2263 (*level_offset_ptr)--;
2267 /* Going down is just as simple. */
2268 while (*level_offset_ptr < 0)
2270 struct frame_info *next = get_next_frame (frame);
2274 (*level_offset_ptr)++;
2281 /* The "select_frame" command. With no argument this is a NOP.
2282 Select the frame at level LEVEL_EXP if it is a valid level.
2283 Otherwise, treat LEVEL_EXP as an address expression and select it.
2285 See parse_frame_specification for more info on proper frame
2289 select_frame_command (char *level_exp, int from_tty)
2291 struct frame_info *prev_frame = get_selected_frame_if_set ();
2293 select_frame (parse_frame_specification (level_exp, NULL));
2294 if (get_selected_frame_if_set () != prev_frame)
2295 observer_notify_user_selected_context_changed (USER_SELECTED_FRAME);
2298 /* The "frame" command. With no argument, print the selected frame
2299 briefly. With an argument, behave like select_frame and then print
2300 the selected frame. */
2303 frame_command (char *level_exp, int from_tty)
2305 struct frame_info *prev_frame = get_selected_frame_if_set ();
2307 select_frame (parse_frame_specification (level_exp, NULL));
2308 if (get_selected_frame_if_set () != prev_frame)
2309 observer_notify_user_selected_context_changed (USER_SELECTED_FRAME);
2311 print_selected_thread_frame (current_uiout, USER_SELECTED_FRAME);
2314 /* Select the frame up one or COUNT_EXP stack levels from the
2315 previously selected frame, and print it briefly. */
2318 up_silently_base (const char *count_exp)
2320 struct frame_info *frame;
2324 count = parse_and_eval_long (count_exp);
2326 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
2327 if (count != 0 && count_exp == NULL)
2328 error (_("Initial frame selected; you cannot go up."));
2329 select_frame (frame);
2333 up_silently_command (char *count_exp, int from_tty)
2335 up_silently_base (count_exp);
2339 up_command (char *count_exp, int from_tty)
2341 up_silently_base (count_exp);
2342 observer_notify_user_selected_context_changed (USER_SELECTED_FRAME);
2345 /* Select the frame down one or COUNT_EXP stack levels from the previously
2346 selected frame, and print it briefly. */
2349 down_silently_base (const char *count_exp)
2351 struct frame_info *frame;
2355 count = -parse_and_eval_long (count_exp);
2357 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
2358 if (count != 0 && count_exp == NULL)
2360 /* We only do this if COUNT_EXP is not specified. That way
2361 "down" means to really go down (and let me know if that is
2362 impossible), but "down 9999" can be used to mean go all the
2363 way down without getting an error. */
2365 error (_("Bottom (innermost) frame selected; you cannot go down."));
2368 select_frame (frame);
2372 down_silently_command (char *count_exp, int from_tty)
2374 down_silently_base (count_exp);
2378 down_command (char *count_exp, int from_tty)
2380 down_silently_base (count_exp);
2381 observer_notify_user_selected_context_changed (USER_SELECTED_FRAME);
2385 return_command (char *retval_exp, int from_tty)
2387 /* Initialize it just to avoid a GCC false warning. */
2388 enum return_value_convention rv_conv = RETURN_VALUE_STRUCT_CONVENTION;
2389 struct frame_info *thisframe;
2390 struct gdbarch *gdbarch;
2391 struct symbol *thisfun;
2392 struct value *return_value = NULL;
2393 struct value *function = NULL;
2394 const char *query_prefix = "";
2396 thisframe = get_selected_frame ("No selected frame.");
2397 thisfun = get_frame_function (thisframe);
2398 gdbarch = get_frame_arch (thisframe);
2400 if (get_frame_type (get_current_frame ()) == INLINE_FRAME)
2401 error (_("Can not force return from an inlined function."));
2403 /* Compute the return value. If the computation triggers an error,
2404 let it bail. If the return type can't be handled, set
2405 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
2409 expression_up retval_expr = parse_expression (retval_exp);
2410 struct type *return_type = NULL;
2412 /* Compute the return value. Should the computation fail, this
2413 call throws an error. */
2414 return_value = evaluate_expression (retval_expr.get ());
2416 /* Cast return value to the return type of the function. Should
2417 the cast fail, this call throws an error. */
2418 if (thisfun != NULL)
2419 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
2420 if (return_type == NULL)
2422 if (retval_expr->elts[0].opcode != UNOP_CAST
2423 && retval_expr->elts[0].opcode != UNOP_CAST_TYPE)
2424 error (_("Return value type not available for selected "
2426 "Please use an explicit cast of the value to return."));
2427 return_type = value_type (return_value);
2429 return_type = check_typedef (return_type);
2430 return_value = value_cast (return_type, return_value);
2432 /* Make sure the value is fully evaluated. It may live in the
2433 stack frame we're about to pop. */
2434 if (value_lazy (return_value))
2435 value_fetch_lazy (return_value);
2437 if (thisfun != NULL)
2438 function = read_var_value (thisfun, NULL, thisframe);
2440 rv_conv = RETURN_VALUE_REGISTER_CONVENTION;
2441 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
2442 /* If the return-type is "void", don't try to find the
2443 return-value's location. However, do still evaluate the
2444 return expression so that, even when the expression result
2445 is discarded, side effects such as "return i++" still
2447 return_value = NULL;
2448 else if (thisfun != NULL)
2450 rv_conv = struct_return_convention (gdbarch, function, return_type);
2451 if (rv_conv == RETURN_VALUE_STRUCT_CONVENTION
2452 || rv_conv == RETURN_VALUE_ABI_RETURNS_ADDRESS)
2454 query_prefix = "The location at which to store the "
2455 "function's return value is unknown.\n"
2456 "If you continue, the return value "
2457 "that you specified will be ignored.\n";
2458 return_value = NULL;
2463 /* Does an interactive user really want to do this? Include
2464 information, such as how well GDB can handle the return value, in
2465 the query message. */
2470 if (thisfun == NULL)
2471 confirmed = query (_("%sMake selected stack frame return now? "),
2475 if (TYPE_NO_RETURN (thisfun->type))
2476 warning (_("Function does not return normally to caller."));
2477 confirmed = query (_("%sMake %s return now? "), query_prefix,
2478 SYMBOL_PRINT_NAME (thisfun));
2481 error (_("Not confirmed"));
2484 /* Discard the selected frame and all frames inner-to it. */
2485 frame_pop (get_selected_frame (NULL));
2487 /* Store RETURN_VALUE in the just-returned register set. */
2488 if (return_value != NULL)
2490 struct type *return_type = value_type (return_value);
2491 struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ());
2493 gdb_assert (rv_conv != RETURN_VALUE_STRUCT_CONVENTION
2494 && rv_conv != RETURN_VALUE_ABI_RETURNS_ADDRESS);
2495 gdbarch_return_value (gdbarch, function, return_type,
2496 get_current_regcache (), NULL /*read*/,
2497 value_contents (return_value) /*write*/);
2500 /* If we are at the end of a call dummy now, pop the dummy frame
2502 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
2503 frame_pop (get_current_frame ());
2505 select_frame (get_current_frame ());
2506 /* If interactive, print the frame that is now current. */
2508 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
2511 /* Sets the scope to input function name, provided that the function
2512 is within the current stack frame. */
2514 struct function_bounds
2516 CORE_ADDR low, high;
2520 func_command (char *arg, int from_tty)
2522 struct frame_info *frame;
2529 frame = get_current_frame ();
2530 std::vector<symtab_and_line> sals
2531 = decode_line_with_current_source (arg, DECODE_LINE_FUNFIRSTLINE);
2532 gdb::def_vector<function_bounds> func_bounds (sals.size ());
2533 for (size_t i = 0; (i < sals.size () && !found); i++)
2535 if (sals[i].pspace != current_program_space)
2536 func_bounds[i].low = func_bounds[i].high = 0;
2537 else if (sals[i].pc == 0
2538 || find_pc_partial_function (sals[i].pc, NULL,
2539 &func_bounds[i].low,
2540 &func_bounds[i].high) == 0)
2542 func_bounds[i].low = func_bounds[i].high = 0;
2548 for (size_t i = 0; (i < sals.size () && !found); i++)
2549 found = (get_frame_pc (frame) >= func_bounds[i].low
2550 && get_frame_pc (frame) < func_bounds[i].high);
2554 frame = find_relative_frame (frame, &level);
2557 while (!found && level == 0);
2560 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
2561 else if (frame != get_selected_frame (NULL))
2562 select_and_print_frame (frame);
2566 _initialize_stack (void)
2568 add_com ("return", class_stack, return_command, _("\
2569 Make selected stack frame return to its caller.\n\
2570 Control remains in the debugger, but when you continue\n\
2571 execution will resume in the frame above the one now selected.\n\
2572 If an argument is given, it is an expression for the value to return."));
2574 add_com ("up", class_stack, up_command, _("\
2575 Select and print stack frame that called this one.\n\
2576 An argument says how many frames up to go."));
2577 add_com ("up-silently", class_support, up_silently_command, _("\
2578 Same as the `up' command, but does not print anything.\n\
2579 This is useful in command scripts."));
2581 add_com ("down", class_stack, down_command, _("\
2582 Select and print stack frame called by this one.\n\
2583 An argument says how many frames down to go."));
2584 add_com_alias ("do", "down", class_stack, 1);
2585 add_com_alias ("dow", "down", class_stack, 1);
2586 add_com ("down-silently", class_support, down_silently_command, _("\
2587 Same as the `down' command, but does not print anything.\n\
2588 This is useful in command scripts."));
2590 add_com ("frame", class_stack, frame_command, _("\
2591 Select and print a stack frame.\nWith no argument, \
2592 print the selected stack frame. (See also \"info frame\").\n\
2593 An argument specifies the frame to select.\n\
2594 It can be a stack frame number or the address of the frame.\n"));
2596 add_com_alias ("f", "frame", class_stack, 1);
2598 add_com_suppress_notification ("select-frame", class_stack, select_frame_command, _("\
2599 Select a stack frame without printing anything.\n\
2600 An argument specifies the frame to select.\n\
2601 It can be a stack frame number or the address of the frame.\n"),
2602 &cli_suppress_notification.user_selected_context);
2604 add_com ("backtrace", class_stack, backtrace_command, _("\
2605 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2606 With a negative argument, print outermost -COUNT frames.\nUse of the \
2607 'full' qualifier also prints the values of the local variables.\n\
2608 Use of the 'no-filters' qualifier prohibits frame filters from executing\n\
2609 on this backtrace.\n"));
2610 add_com_alias ("bt", "backtrace", class_stack, 0);
2612 add_com_alias ("where", "backtrace", class_alias, 0);
2613 add_info ("stack", backtrace_command,
2614 _("Backtrace of the stack, or innermost COUNT frames."));
2615 add_info_alias ("s", "stack", 1);
2616 add_info ("frame", info_frame_command,
2617 _("All about selected stack frame, or frame at ADDR."));
2618 add_info_alias ("f", "frame", 1);
2619 add_info ("locals", info_locals_command,
2620 _("Local variables of current stack frame."));
2621 add_info ("args", info_args_command,
2622 _("Argument variables of current stack frame."));
2625 add_com ("func", class_stack, func_command, _("\
2626 Select the stack frame that contains <func>.\n\
2627 Usage: func <name>\n"));
2629 add_setshow_enum_cmd ("frame-arguments", class_stack,
2630 print_frame_arguments_choices, &print_frame_arguments,
2631 _("Set printing of non-scalar frame arguments"),
2632 _("Show printing of non-scalar frame arguments"),
2633 NULL, NULL, NULL, &setprintlist, &showprintlist);
2635 add_setshow_boolean_cmd ("frame-arguments", no_class,
2636 &print_raw_frame_arguments, _("\
2637 Set whether to print frame arguments in raw form."), _("\
2638 Show whether to print frame arguments in raw form."), _("\
2639 If set, frame arguments are printed in raw form, bypassing any\n\
2640 pretty-printers for that value."),
2642 &setprintrawlist, &showprintrawlist);
2644 add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack,
2645 &disassemble_next_line, _("\
2646 Set whether to disassemble next source line or insn when execution stops."),
2648 Show whether to disassemble next source line or insn when execution stops."),
2650 If ON, GDB will display disassembly of the next source line, in addition\n\
2651 to displaying the source line itself. If the next source line cannot\n\
2652 be displayed (e.g., source is unavailable or there's no line info), GDB\n\
2653 will display disassembly of next instruction instead of showing the\n\
2655 If AUTO, display disassembly of next instruction only if the source line\n\
2656 cannot be displayed.\n\
2657 If OFF (which is the default), never display the disassembly of the next\n\
2660 show_disassemble_next_line,
2661 &setlist, &showlist);
2662 disassemble_next_line = AUTO_BOOLEAN_FALSE;
2664 add_setshow_enum_cmd ("entry-values", class_stack,
2665 print_entry_values_choices, &print_entry_values,
2666 _("Set printing of function arguments at function "
2668 _("Show printing of function arguments at function "
2671 GDB can sometimes determine the values of function arguments at entry,\n\
2672 in addition to their current values. This option tells GDB whether\n\
2673 to print the current value, the value at entry (marked as val@entry),\n\
2674 or both. Note that one or both of these values may be <optimized out>."),
2675 NULL, NULL, &setprintlist, &showprintlist);