1 /* Print and select stack frames for GDB, the GNU debugger.
3 Copyright (C) 1986-2013 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 "exceptions.h"
40 #include "reggroups.h"
44 #include "gdbthread.h"
45 #include "cp-support.h"
47 #include "inline-frame.h"
50 #include "gdb_assert.h"
52 #include "gdb_string.h"
57 void (*deprecated_selected_frame_level_changed_hook) (int);
59 /* The possible choices of "set print frame-arguments", and the value
62 static const char *const print_frame_arguments_choices[] =
63 {"all", "scalars", "none", NULL};
64 static const char *print_frame_arguments = "scalars";
66 /* The possible choices of "set print entry-values", and the value
69 const char print_entry_values_no[] = "no";
70 const char print_entry_values_only[] = "only";
71 const char print_entry_values_preferred[] = "preferred";
72 const char print_entry_values_if_needed[] = "if-needed";
73 const char print_entry_values_both[] = "both";
74 const char print_entry_values_compact[] = "compact";
75 const char print_entry_values_default[] = "default";
76 static const char *const print_entry_values_choices[] =
78 print_entry_values_no,
79 print_entry_values_only,
80 print_entry_values_preferred,
81 print_entry_values_if_needed,
82 print_entry_values_both,
83 print_entry_values_compact,
84 print_entry_values_default,
87 const char *print_entry_values = print_entry_values_default;
89 /* Prototypes for local functions. */
91 static void print_frame_local_vars (struct frame_info *, int,
94 static void print_frame (struct frame_info *frame, int print_level,
95 enum print_what print_what, int print_args,
96 struct symtab_and_line sal);
98 static void set_last_displayed_sal (int valid,
99 struct program_space *pspace,
101 struct symtab *symtab,
104 /* Zero means do things normally; we are interacting directly with the
105 user. One means print the full filename and linenumber when a
106 frame is printed, and do so in a format emacs18/emacs19.22 can
107 parse. Two means print similar annotations, but in many more
108 cases and in a slightly different syntax. */
110 int annotation_level = 0;
112 /* These variables hold the last symtab and line we displayed to the user.
113 * This is where we insert a breakpoint or a skiplist entry by default. */
114 static int last_displayed_sal_valid = 0;
115 static struct program_space *last_displayed_pspace = 0;
116 static CORE_ADDR last_displayed_addr = 0;
117 static struct symtab *last_displayed_symtab = 0;
118 static int last_displayed_line = 0;
121 /* Return 1 if we should display the address in addition to the location,
122 because we are in the middle of a statement. */
125 frame_show_address (struct frame_info *frame,
126 struct symtab_and_line sal)
128 /* If there is a line number, but no PC, then there is no location
129 information associated with this sal. The only way that should
130 happen is for the call sites of inlined functions (SAL comes from
131 find_frame_sal). Otherwise, we would have some PC range if the
132 SAL came from a line table. */
133 if (sal.line != 0 && sal.pc == 0 && sal.end == 0)
135 if (get_next_frame (frame) == NULL)
136 gdb_assert (inline_skipped_frames (inferior_ptid) > 0);
138 gdb_assert (get_frame_type (get_next_frame (frame)) == INLINE_FRAME);
142 return get_frame_pc (frame) != sal.pc;
145 /* Show or print a stack frame FRAME briefly. The output is format
146 according to PRINT_LEVEL and PRINT_WHAT printing the frame's
147 relative level, function name, argument list, and file name and
148 line number. If the frame's PC is not at the beginning of the
149 source line, the actual PC is printed at the beginning. */
152 print_stack_frame (struct frame_info *frame, int print_level,
153 enum print_what print_what)
155 volatile struct gdb_exception e;
157 /* For mi, alway print location and address. */
158 if (ui_out_is_mi_like_p (current_uiout))
159 print_what = LOC_AND_ADDRESS;
161 TRY_CATCH (e, RETURN_MASK_ERROR)
163 int center = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
165 print_frame_info (frame, print_level, print_what, 1 /* print_args */);
166 set_current_sal_from_frame (frame, center);
170 /* Print nameless arguments of frame FRAME on STREAM, where START is
171 the offset of the first nameless argument, and NUM is the number of
172 nameless arguments to print. FIRST is nonzero if this is the first
173 argument (not just the first nameless argument). */
176 print_frame_nameless_args (struct frame_info *frame, long start, int num,
177 int first, struct ui_file *stream)
179 struct gdbarch *gdbarch = get_frame_arch (frame);
180 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
185 for (i = 0; i < num; i++)
188 argsaddr = get_frame_args_address (frame);
191 arg_value = read_memory_integer (argsaddr + start,
192 sizeof (int), byte_order);
194 fprintf_filtered (stream, ", ");
195 fprintf_filtered (stream, "%ld", arg_value);
197 start += sizeof (int);
201 /* Print single argument of inferior function. ARG must be already
204 Errors are printed as if they would be the parameter value. Use zeroed ARG
205 iff it should not be printed accoring to user settings. */
208 print_frame_arg (const struct frame_arg *arg)
210 struct ui_out *uiout = current_uiout;
211 volatile struct gdb_exception except;
212 struct cleanup *old_chain;
215 stb = mem_fileopen ();
216 old_chain = make_cleanup_ui_file_delete (stb);
218 gdb_assert (!arg->val || !arg->error);
219 gdb_assert (arg->entry_kind == print_entry_values_no
220 || arg->entry_kind == print_entry_values_only
221 || (!ui_out_is_mi_like_p (uiout)
222 && arg->entry_kind == print_entry_values_compact));
224 annotate_arg_begin ();
226 make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
227 fprintf_symbol_filtered (stb, SYMBOL_PRINT_NAME (arg->sym),
228 SYMBOL_LANGUAGE (arg->sym), DMGL_PARAMS | DMGL_ANSI);
229 if (arg->entry_kind == print_entry_values_compact)
231 /* It is OK to provide invalid MI-like stream as with
232 PRINT_ENTRY_VALUE_COMPACT we never use MI. */
233 fputs_filtered ("=", stb);
235 fprintf_symbol_filtered (stb, SYMBOL_PRINT_NAME (arg->sym),
236 SYMBOL_LANGUAGE (arg->sym),
237 DMGL_PARAMS | DMGL_ANSI);
239 if (arg->entry_kind == print_entry_values_only
240 || arg->entry_kind == print_entry_values_compact)
241 fputs_filtered ("@entry", stb);
242 ui_out_field_stream (uiout, "name", stb);
243 annotate_arg_name_end ();
244 ui_out_text (uiout, "=");
246 if (!arg->val && !arg->error)
247 ui_out_text (uiout, "...");
251 except.message = arg->error;
254 /* TRY_CATCH has two statements, wrap it in a block. */
256 TRY_CATCH (except, RETURN_MASK_ERROR)
258 const struct language_defn *language;
259 struct value_print_options opts;
261 /* Avoid value_print because it will deref ref parameters. We
262 just want to print their addresses. Print ??? for args whose
263 address we do not know. We pass 2 as "recurse" to val_print
264 because our standard indentation here is 4 spaces, and
265 val_print indents 2 for each recurse. */
267 annotate_arg_value (value_type (arg->val));
269 /* Use the appropriate language to display our symbol, unless the
270 user forced the language to a specific language. */
271 if (language_mode == language_mode_auto)
272 language = language_def (SYMBOL_LANGUAGE (arg->sym));
274 language = current_language;
276 get_raw_print_options (&opts);
279 /* True in "summary" mode, false otherwise. */
280 opts.summary = !strcmp (print_frame_arguments, "scalars");
282 common_val_print (arg->val, stb, 2, &opts, language);
286 fprintf_filtered (stb, _("<error reading variable: %s>"),
290 ui_out_field_stream (uiout, "value", stb);
292 /* Also invoke ui_out_tuple_end. */
293 do_cleanups (old_chain);
298 /* Read in inferior function parameter SYM at FRAME into ARGP. Caller is
299 responsible for xfree of ARGP->ERROR. This function never throws an
303 read_frame_arg (struct symbol *sym, struct frame_info *frame,
304 struct frame_arg *argp, struct frame_arg *entryargp)
306 struct value *val = NULL, *entryval = NULL;
307 char *val_error = NULL, *entryval_error = NULL;
309 volatile struct gdb_exception except;
311 if (print_entry_values != print_entry_values_only
312 && print_entry_values != print_entry_values_preferred)
314 TRY_CATCH (except, RETURN_MASK_ERROR)
316 val = read_var_value (sym, frame);
320 val_error = alloca (strlen (except.message) + 1);
321 strcpy (val_error, except.message);
325 if (SYMBOL_CLASS (sym) == LOC_COMPUTED
326 && print_entry_values != print_entry_values_no
327 && (print_entry_values != print_entry_values_if_needed
328 || !val || value_optimized_out (val)))
330 TRY_CATCH (except, RETURN_MASK_ERROR)
332 const struct symbol_computed_ops *ops;
334 ops = SYMBOL_COMPUTED_OPS (sym);
335 entryval = ops->read_variable_at_entry (sym, frame);
339 entryval_error = alloca (strlen (except.message) + 1);
340 strcpy (entryval_error, except.message);
343 if (except.error == NO_ENTRY_VALUE_ERROR
344 || (entryval && value_optimized_out (entryval)))
347 entryval_error = NULL;
350 if (print_entry_values == print_entry_values_compact
351 || print_entry_values == print_entry_values_default)
353 /* For MI do not try to use print_entry_values_compact for ARGP. */
355 if (val && entryval && !ui_out_is_mi_like_p (current_uiout))
357 struct type *type = value_type (val);
359 if (!value_optimized_out (val) && value_lazy (val))
360 value_fetch_lazy (val);
361 if (!value_optimized_out (val) && value_lazy (entryval))
362 value_fetch_lazy (entryval);
363 if (!value_optimized_out (val)
364 && value_available_contents_eq (val, 0, entryval, 0,
367 /* Initialize it just to avoid a GCC false warning. */
368 struct value *val_deref = NULL, *entryval_deref;
370 /* DW_AT_GNU_call_site_value does match with the current
371 value. If it is a reference still try to verify if
372 dereferenced DW_AT_GNU_call_site_data_value does not
375 TRY_CATCH (except, RETURN_MASK_ERROR)
377 struct type *type_deref;
379 val_deref = coerce_ref (val);
380 if (value_lazy (val_deref))
381 value_fetch_lazy (val_deref);
382 type_deref = value_type (val_deref);
384 entryval_deref = coerce_ref (entryval);
385 if (value_lazy (entryval_deref))
386 value_fetch_lazy (entryval_deref);
388 /* If the reference addresses match but dereferenced
389 content does not match print them. */
391 && value_available_contents_eq (val_deref, 0,
393 TYPE_LENGTH (type_deref)))
397 /* Value was not a reference; and its content matches. */
398 if (val == val_deref)
400 /* If the dereferenced content could not be fetched do not
402 else if (except.error == NO_ENTRY_VALUE_ERROR)
404 else if (except.message)
406 entryval_error = alloca (strlen (except.message) + 1);
407 strcpy (entryval_error, except.message);
415 /* Try to remove possibly duplicate error message for ENTRYARGP even
418 if (val_error && entryval_error
419 && strcmp (val_error, entryval_error) == 0)
421 entryval_error = NULL;
423 /* Do not se VAL_EQUAL as the same error message may be shown for
424 the entry value even if no entry values are present in the
430 if (entryval == NULL)
432 if (print_entry_values == print_entry_values_preferred)
434 TRY_CATCH (except, RETURN_MASK_ERROR)
436 val = read_var_value (sym, frame);
440 val_error = alloca (strlen (except.message) + 1);
441 strcpy (val_error, except.message);
444 if (print_entry_values == print_entry_values_only
445 || print_entry_values == print_entry_values_both
446 || (print_entry_values == print_entry_values_preferred
447 && (!val || value_optimized_out (val))))
448 entryval = allocate_optimized_out_value (SYMBOL_TYPE (sym));
450 if ((print_entry_values == print_entry_values_compact
451 || print_entry_values == print_entry_values_if_needed
452 || print_entry_values == print_entry_values_preferred)
453 && (!val || value_optimized_out (val)) && entryval != NULL)
461 argp->error = val_error ? xstrdup (val_error) : NULL;
462 if (!val && !val_error)
463 argp->entry_kind = print_entry_values_only;
464 else if ((print_entry_values == print_entry_values_compact
465 || print_entry_values == print_entry_values_default) && val_equal)
467 argp->entry_kind = print_entry_values_compact;
468 gdb_assert (!ui_out_is_mi_like_p (current_uiout));
471 argp->entry_kind = print_entry_values_no;
473 entryargp->sym = sym;
474 entryargp->val = entryval;
475 entryargp->error = entryval_error ? xstrdup (entryval_error) : NULL;
476 if (!entryval && !entryval_error)
477 entryargp->entry_kind = print_entry_values_no;
479 entryargp->entry_kind = print_entry_values_only;
482 /* Print the arguments of frame FRAME on STREAM, given the function
483 FUNC running in that frame (as a symbol), where NUM is the number
484 of arguments according to the stack frame (or -1 if the number of
485 arguments is unknown). */
487 /* Note that currently the "number of arguments according to the
488 stack frame" is only known on VAX where i refers to the "number of
489 ints of arguments according to the stack frame". */
492 print_frame_args (struct symbol *func, struct frame_info *frame,
493 int num, struct ui_file *stream)
495 struct ui_out *uiout = current_uiout;
497 /* Offset of next stack argument beyond the one we have seen that is
498 at the highest offset, or -1 if we haven't come to a stack
500 long highest_offset = -1;
501 /* Number of ints of arguments that we have printed so far. */
502 int args_printed = 0;
503 struct cleanup *old_chain;
505 /* True if we should print arguments, false otherwise. */
506 int print_args = strcmp (print_frame_arguments, "none");
508 stb = mem_fileopen ();
509 old_chain = make_cleanup_ui_file_delete (stb);
513 struct block *b = SYMBOL_BLOCK_VALUE (func);
514 struct block_iterator iter;
517 ALL_BLOCK_SYMBOLS (b, iter, sym)
519 struct frame_arg arg, entryarg;
523 /* Keep track of the highest stack argument offset seen, and
524 skip over any kinds of symbols we don't care about. */
526 if (!SYMBOL_IS_ARGUMENT (sym))
529 switch (SYMBOL_CLASS (sym))
534 long current_offset = SYMBOL_VALUE (sym);
535 int arg_size = TYPE_LENGTH (SYMBOL_TYPE (sym));
537 /* Compute address of next argument by adding the size of
538 this argument and rounding to an int boundary. */
540 ((current_offset + arg_size + sizeof (int) - 1)
541 & ~(sizeof (int) - 1));
543 /* If this is the highest offset seen yet, set
545 if (highest_offset == -1
546 || (current_offset > highest_offset))
547 highest_offset = current_offset;
549 /* Add the number of ints we're about to print to
551 args_printed += (arg_size + sizeof (int) - 1) / sizeof (int);
554 /* We care about types of symbols, but don't need to
555 keep track of stack offsets in them. */
557 case LOC_REGPARM_ADDR:
559 case LOC_OPTIMIZED_OUT:
564 /* We have to look up the symbol because arguments can have
565 two entries (one a parameter, one a local) and the one we
566 want is the local, which lookup_symbol will find for us.
567 This includes gcc1 (not gcc2) on SPARC when passing a
568 small structure and gcc2 when the argument type is float
569 and it is passed as a double and converted to float by
570 the prologue (in the latter case the type of the LOC_ARG
571 symbol is double and the type of the LOC_LOCAL symbol is
573 /* But if the parameter name is null, don't try it. Null
574 parameter names occur on the RS/6000, for traceback
575 tables. FIXME, should we even print them? */
577 if (*SYMBOL_LINKAGE_NAME (sym))
581 nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
582 b, VAR_DOMAIN, NULL);
583 gdb_assert (nsym != NULL);
584 if (SYMBOL_CLASS (nsym) == LOC_REGISTER
585 && !SYMBOL_IS_ARGUMENT (nsym))
587 /* There is a LOC_ARG/LOC_REGISTER pair. This means
588 that it was passed on the stack and loaded into a
589 register, or passed in a register and stored in a
590 stack slot. GDB 3.x used the LOC_ARG; GDB
591 4.0-4.11 used the LOC_REGISTER.
593 Reasons for using the LOC_ARG:
595 (1) Because find_saved_registers may be slow for
598 (2) Because registers are often re-used and stack
599 slots rarely (never?) are. Therefore using
600 the stack slot is much less likely to print
603 Reasons why we might want to use the LOC_REGISTER:
605 (1) So that the backtrace prints the same value
606 as "print foo". I see no compelling reason
607 why this needs to be the case; having the
608 backtrace print the value which was passed
609 in, and "print foo" print the value as
610 modified within the called function, makes
613 Additional note: It might be nice if "info args"
614 displayed both values.
616 One more note: There is a case with SPARC
617 structure passing where we need to use the
618 LOC_REGISTER, but this is dealt with by creating
619 a single LOC_REGPARM in symbol reading. */
621 /* Leave sym (the LOC_ARG) alone. */
628 /* Print the current arg. */
630 ui_out_text (uiout, ", ");
631 ui_out_wrap_hint (uiout, " ");
635 memset (&arg, 0, sizeof (arg));
637 arg.entry_kind = print_entry_values_no;
638 memset (&entryarg, 0, sizeof (entryarg));
640 entryarg.entry_kind = print_entry_values_no;
643 read_frame_arg (sym, frame, &arg, &entryarg);
645 if (arg.entry_kind != print_entry_values_only)
646 print_frame_arg (&arg);
648 if (entryarg.entry_kind != print_entry_values_no)
650 if (arg.entry_kind != print_entry_values_only)
652 ui_out_text (uiout, ", ");
653 ui_out_wrap_hint (uiout, " ");
656 print_frame_arg (&entryarg);
660 xfree (entryarg.error);
666 /* Don't print nameless args in situations where we don't know
667 enough about the stack to find them. */
672 if (highest_offset == -1)
673 start = gdbarch_frame_args_skip (get_frame_arch (frame));
675 start = highest_offset;
677 print_frame_nameless_args (frame, start, num - args_printed,
681 do_cleanups (old_chain);
684 /* Set the current source and line to the location given by frame
685 FRAME, if possible. When CENTER is true, adjust so the relevant
686 line is in the center of the next 'list'. */
689 set_current_sal_from_frame (struct frame_info *frame, int center)
691 struct symtab_and_line sal;
693 find_frame_sal (frame, &sal);
697 sal.line = max (sal.line - get_lines_to_list () / 2, 1);
698 set_current_source_symtab_and_line (&sal);
702 /* If ON, GDB will display disassembly of the next source line when
703 execution of the program being debugged stops.
704 If AUTO (which is the default), or there's no line info to determine
705 the source line of the next instruction, display disassembly of next
706 instruction instead. */
708 static enum auto_boolean disassemble_next_line;
711 show_disassemble_next_line (struct ui_file *file, int from_tty,
712 struct cmd_list_element *c,
715 fprintf_filtered (file,
716 _("Debugger's willingness to use "
717 "disassemble-next-line is %s.\n"),
721 /* Use TRY_CATCH to catch the exception from the gdb_disassembly
722 because it will be broken by filter sometime. */
725 do_gdb_disassembly (struct gdbarch *gdbarch,
726 int how_many, CORE_ADDR low, CORE_ADDR high)
728 volatile struct gdb_exception exception;
730 TRY_CATCH (exception, RETURN_MASK_ERROR)
732 gdb_disassembly (gdbarch, current_uiout, 0,
733 DISASSEMBLY_RAW_INSN, how_many,
736 if (exception.reason < 0)
738 /* If an exception was thrown while doing the disassembly, print
739 the error message, to give the user a clue of what happened. */
740 exception_print (gdb_stderr, exception);
744 /* Print information about frame FRAME. The output is format according
745 to PRINT_LEVEL and PRINT_WHAT and PRINT_ARGS. The meaning of
748 SRC_LINE: Print only source line.
749 LOCATION: Print only location.
750 LOC_AND_SRC: Print location and source line.
752 Used in "where" output, and to emit breakpoint or step
756 print_frame_info (struct frame_info *frame, int print_level,
757 enum print_what print_what, int print_args)
759 struct gdbarch *gdbarch = get_frame_arch (frame);
760 struct symtab_and_line sal;
763 struct ui_out *uiout = current_uiout;
765 if (get_frame_type (frame) == DUMMY_FRAME
766 || get_frame_type (frame) == SIGTRAMP_FRAME
767 || get_frame_type (frame) == ARCH_FRAME)
769 struct cleanup *uiout_cleanup
770 = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
772 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
773 gdbarch, get_frame_pc (frame));
775 /* Do this regardless of SOURCE because we don't have any source
776 to list for this frame. */
779 ui_out_text (uiout, "#");
780 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
781 frame_relative_level (frame));
783 if (ui_out_is_mi_like_p (uiout))
785 annotate_frame_address ();
786 ui_out_field_core_addr (uiout, "addr",
787 gdbarch, get_frame_pc (frame));
788 annotate_frame_address_end ();
791 if (get_frame_type (frame) == DUMMY_FRAME)
793 annotate_function_call ();
794 ui_out_field_string (uiout, "func", "<function called from gdb>");
796 else if (get_frame_type (frame) == SIGTRAMP_FRAME)
798 annotate_signal_handler_caller ();
799 ui_out_field_string (uiout, "func", "<signal handler called>");
801 else if (get_frame_type (frame) == ARCH_FRAME)
803 ui_out_field_string (uiout, "func", "<cross-architecture call>");
805 ui_out_text (uiout, "\n");
806 annotate_frame_end ();
808 do_cleanups (uiout_cleanup);
812 /* If FRAME is not the innermost frame, that normally means that
813 FRAME->pc points to *after* the call instruction, and we want to
814 get the line containing the call, never the next line. But if
815 the next frame is a SIGTRAMP_FRAME or a DUMMY_FRAME, then the
816 next frame was not entered as the result of a call, and we want
817 to get the line containing FRAME->pc. */
818 find_frame_sal (frame, &sal);
820 location_print = (print_what == LOCATION
821 || print_what == LOC_AND_ADDRESS
822 || print_what == SRC_AND_LOC);
824 if (location_print || !sal.symtab)
825 print_frame (frame, print_level, print_what, print_args, sal);
827 source_print = (print_what == SRC_LINE || print_what == SRC_AND_LOC);
829 /* If disassemble-next-line is set to auto or on and doesn't have
830 the line debug messages for $pc, output the next instruction. */
831 if ((disassemble_next_line == AUTO_BOOLEAN_AUTO
832 || disassemble_next_line == AUTO_BOOLEAN_TRUE)
833 && source_print && !sal.symtab)
834 do_gdb_disassembly (get_frame_arch (frame), 1,
835 get_frame_pc (frame), get_frame_pc (frame) + 1);
837 if (source_print && sal.symtab)
840 int mid_statement = ((print_what == SRC_LINE)
841 && frame_show_address (frame, sal));
843 if (annotation_level)
844 done = identify_source_line (sal.symtab, sal.line, mid_statement,
845 get_frame_pc (frame));
848 if (deprecated_print_frame_info_listing_hook)
849 deprecated_print_frame_info_listing_hook (sal.symtab,
854 struct value_print_options opts;
856 get_user_print_options (&opts);
857 /* We used to do this earlier, but that is clearly
858 wrong. This function is used by many different
859 parts of gdb, including normal_stop in infrun.c,
860 which uses this to print out the current PC
861 when we stepi/nexti into the middle of a source
862 line. Only the command line really wants this
863 behavior. Other UIs probably would like the
864 ability to decide for themselves if it is desired. */
865 if (opts.addressprint && mid_statement)
867 ui_out_field_core_addr (uiout, "addr",
868 gdbarch, get_frame_pc (frame));
869 ui_out_text (uiout, "\t");
872 print_source_lines (sal.symtab, sal.line, sal.line + 1, 0);
876 /* If disassemble-next-line is set to on and there is line debug
877 messages, output assembly codes for next line. */
878 if (disassemble_next_line == AUTO_BOOLEAN_TRUE)
879 do_gdb_disassembly (get_frame_arch (frame), -1, sal.pc, sal.end);
882 if (print_what != LOCATION)
886 if (get_frame_pc_if_available (frame, &pc))
887 set_last_displayed_sal (1, sal.pspace, pc, sal.symtab, sal.line);
889 set_last_displayed_sal (0, 0, 0, 0, 0);
892 annotate_frame_end ();
894 gdb_flush (gdb_stdout);
897 /* Remember the last symtab and line we displayed, which we use e.g.
898 * as the place to put a breakpoint when the `break' command is
899 * invoked with no arguments. */
902 set_last_displayed_sal (int valid, struct program_space *pspace,
903 CORE_ADDR addr, struct symtab *symtab,
906 last_displayed_sal_valid = valid;
907 last_displayed_pspace = pspace;
908 last_displayed_addr = addr;
909 last_displayed_symtab = symtab;
910 last_displayed_line = line;
911 if (valid && pspace == NULL)
913 clear_last_displayed_sal ();
914 internal_error (__FILE__, __LINE__,
915 _("Trying to set NULL pspace."));
919 /* Forget the last sal we displayed. */
922 clear_last_displayed_sal (void)
924 last_displayed_sal_valid = 0;
925 last_displayed_pspace = 0;
926 last_displayed_addr = 0;
927 last_displayed_symtab = 0;
928 last_displayed_line = 0;
931 /* Is our record of the last sal we displayed valid? If not,
932 * the get_last_displayed_* functions will return NULL or 0, as
936 last_displayed_sal_is_valid (void)
938 return last_displayed_sal_valid;
941 /* Get the pspace of the last sal we displayed, if it's valid. */
943 struct program_space *
944 get_last_displayed_pspace (void)
946 if (last_displayed_sal_valid)
947 return last_displayed_pspace;
951 /* Get the address of the last sal we displayed, if it's valid. */
954 get_last_displayed_addr (void)
956 if (last_displayed_sal_valid)
957 return last_displayed_addr;
961 /* Get the symtab of the last sal we displayed, if it's valid. */
964 get_last_displayed_symtab (void)
966 if (last_displayed_sal_valid)
967 return last_displayed_symtab;
971 /* Get the line of the last sal we displayed, if it's valid. */
974 get_last_displayed_line (void)
976 if (last_displayed_sal_valid)
977 return last_displayed_line;
981 /* Get the last sal we displayed, if it's valid. */
984 get_last_displayed_sal (struct symtab_and_line *sal)
986 if (last_displayed_sal_valid)
988 sal->pspace = last_displayed_pspace;
989 sal->pc = last_displayed_addr;
990 sal->symtab = last_displayed_symtab;
991 sal->line = last_displayed_line;
1003 /* Attempt to obtain the FUNNAME, FUNLANG and optionally FUNCP of the function
1004 corresponding to FRAME. */
1007 find_frame_funname (struct frame_info *frame, const char **funname,
1008 enum language *funlang, struct symbol **funcp)
1010 struct symbol *func;
1013 *funlang = language_unknown;
1017 func = get_frame_function (frame);
1020 /* In certain pathological cases, the symtabs give the wrong
1021 function (when we are in the first function in a file which
1022 is compiled without debugging symbols, the previous function
1023 is compiled with debugging symbols, and the "foo.o" symbol
1024 that is supposed to tell us where the file with debugging
1025 symbols ends has been truncated by ar because it is longer
1026 than 15 characters). This also occurs if the user uses asm()
1027 to create a function but not stabs for it (in a file compiled
1030 So look in the minimal symbol tables as well, and if it comes
1031 up with a larger address for the function use that instead.
1032 I don't think this can ever cause any problems; there
1033 shouldn't be any minimal symbols in the middle of a function;
1034 if this is ever changed many parts of GDB will need to be
1035 changed (and we'll create a find_pc_minimal_function or some
1038 struct minimal_symbol *msymbol = NULL;
1040 /* Don't attempt to do this for inlined functions, which do not
1041 have a corresponding minimal symbol. */
1042 if (!block_inlined_p (SYMBOL_BLOCK_VALUE (func)))
1044 = lookup_minimal_symbol_by_pc (get_frame_address_in_block (frame));
1047 && (SYMBOL_VALUE_ADDRESS (msymbol)
1048 > BLOCK_START (SYMBOL_BLOCK_VALUE (func))))
1050 /* We also don't know anything about the function besides
1051 its address and name. */
1053 *funname = SYMBOL_PRINT_NAME (msymbol);
1054 *funlang = SYMBOL_LANGUAGE (msymbol);
1058 *funname = SYMBOL_PRINT_NAME (func);
1059 *funlang = SYMBOL_LANGUAGE (func);
1062 if (*funlang == language_cplus)
1064 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
1065 to display the demangled name that we already have
1066 stored in the symbol table, but we stored a version
1067 with DMGL_PARAMS turned on, and here we don't want to
1068 display parameters. So remove the parameters. */
1069 char *func_only = cp_remove_params (*funname);
1073 *funname = func_only;
1074 make_cleanup (xfree, func_only);
1081 struct minimal_symbol *msymbol;
1084 if (!get_frame_address_in_block_if_available (frame, &pc))
1087 msymbol = lookup_minimal_symbol_by_pc (pc);
1088 if (msymbol != NULL)
1090 *funname = SYMBOL_PRINT_NAME (msymbol);
1091 *funlang = SYMBOL_LANGUAGE (msymbol);
1097 print_frame (struct frame_info *frame, int print_level,
1098 enum print_what print_what, int print_args,
1099 struct symtab_and_line sal)
1101 struct gdbarch *gdbarch = get_frame_arch (frame);
1102 struct ui_out *uiout = current_uiout;
1103 const char *funname = NULL;
1104 enum language funlang = language_unknown;
1105 struct ui_file *stb;
1106 struct cleanup *old_chain, *list_chain;
1107 struct value_print_options opts;
1108 struct symbol *func;
1112 pc_p = get_frame_pc_if_available (frame, &pc);
1114 stb = mem_fileopen ();
1115 old_chain = make_cleanup_ui_file_delete (stb);
1117 find_frame_funname (frame, &funname, &funlang, &func);
1119 annotate_frame_begin (print_level ? frame_relative_level (frame) : 0,
1122 list_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
1126 ui_out_text (uiout, "#");
1127 ui_out_field_fmt_int (uiout, 2, ui_left, "level",
1128 frame_relative_level (frame));
1130 get_user_print_options (&opts);
1131 if (opts.addressprint)
1133 || frame_show_address (frame, sal)
1134 || print_what == LOC_AND_ADDRESS)
1136 annotate_frame_address ();
1138 ui_out_field_core_addr (uiout, "addr", gdbarch, pc);
1140 ui_out_field_string (uiout, "addr", "<unavailable>");
1141 annotate_frame_address_end ();
1142 ui_out_text (uiout, " in ");
1144 annotate_frame_function_name ();
1145 fprintf_symbol_filtered (stb, funname ? funname : "??",
1146 funlang, DMGL_ANSI);
1147 ui_out_field_stream (uiout, "func", stb);
1148 ui_out_wrap_hint (uiout, " ");
1149 annotate_frame_args ();
1151 ui_out_text (uiout, " (");
1154 struct gdbarch *gdbarch = get_frame_arch (frame);
1156 struct cleanup *args_list_chain;
1157 volatile struct gdb_exception e;
1159 if (gdbarch_frame_num_args_p (gdbarch))
1161 numargs = gdbarch_frame_num_args (gdbarch, frame);
1162 gdb_assert (numargs >= 0);
1167 args_list_chain = make_cleanup_ui_out_list_begin_end (uiout, "args");
1168 TRY_CATCH (e, RETURN_MASK_ERROR)
1170 print_frame_args (func, frame, numargs, gdb_stdout);
1172 /* FIXME: ARGS must be a list. If one argument is a string it
1173 will have " that will not be properly escaped. */
1174 /* Invoke ui_out_tuple_end. */
1175 do_cleanups (args_list_chain);
1178 ui_out_text (uiout, ")");
1181 const char *filename_display;
1183 filename_display = symtab_to_filename_for_display (sal.symtab);
1184 annotate_frame_source_begin ();
1185 ui_out_wrap_hint (uiout, " ");
1186 ui_out_text (uiout, " at ");
1187 annotate_frame_source_file ();
1188 ui_out_field_string (uiout, "file", filename_display);
1189 if (ui_out_is_mi_like_p (uiout))
1191 const char *fullname = symtab_to_fullname (sal.symtab);
1193 ui_out_field_string (uiout, "fullname", fullname);
1195 annotate_frame_source_file_end ();
1196 ui_out_text (uiout, ":");
1197 annotate_frame_source_line ();
1198 ui_out_field_int (uiout, "line", sal.line);
1199 annotate_frame_source_end ();
1202 if (pc_p && (funname == NULL || sal.symtab == NULL))
1205 char *lib = PC_SOLIB (get_frame_pc (frame));
1207 char *lib = solib_name_from_address (get_frame_program_space (frame),
1208 get_frame_pc (frame));
1212 annotate_frame_where ();
1213 ui_out_wrap_hint (uiout, " ");
1214 ui_out_text (uiout, " from ");
1215 ui_out_field_string (uiout, "from", lib);
1219 /* do_cleanups will call ui_out_tuple_end() for us. */
1220 do_cleanups (list_chain);
1221 ui_out_text (uiout, "\n");
1222 do_cleanups (old_chain);
1226 /* Read a frame specification in whatever the appropriate format is
1227 from FRAME_EXP. Call error(), printing MESSAGE, if the
1228 specification is in any way invalid (so this function never returns
1229 NULL). When SEPECTED_P is non-NULL set its target to indicate that
1230 the default selected frame was used. */
1232 static struct frame_info *
1233 parse_frame_specification_1 (const char *frame_exp, const char *message,
1234 int *selected_frame_p)
1237 struct value *args[4];
1238 CORE_ADDR addrs[ARRAY_SIZE (args)];
1240 if (frame_exp == NULL)
1248 struct cleanup *cleanup;
1251 /* Skip leading white space, bail of EOL. */
1252 while (isspace (*frame_exp))
1257 /* Parse the argument, extract it, save it. */
1259 *p && !isspace (*p);
1261 addr_string = savestring (frame_exp, p - frame_exp);
1263 cleanup = make_cleanup (xfree, addr_string);
1265 /* NOTE: Parse and evaluate expression, but do not use
1266 functions such as parse_and_eval_long or
1267 parse_and_eval_address to also extract the value.
1268 Instead value_as_long and value_as_address are used.
1269 This avoids problems with expressions that contain
1271 if (numargs >= ARRAY_SIZE (args))
1272 error (_("Too many args in frame specification"));
1273 args[numargs++] = parse_and_eval (addr_string);
1275 do_cleanups (cleanup);
1279 /* If no args, default to the selected frame. */
1282 if (selected_frame_p != NULL)
1283 (*selected_frame_p) = 1;
1284 return get_selected_frame (message);
1287 /* None of the remaining use the selected frame. */
1288 if (selected_frame_p != NULL)
1289 (*selected_frame_p) = 0;
1291 /* Assume the single arg[0] is an integer, and try using that to
1292 select a frame relative to current. */
1295 struct frame_info *fid;
1296 int level = value_as_long (args[0]);
1298 fid = find_relative_frame (get_current_frame (), &level);
1300 /* find_relative_frame was successful. */
1304 /* Convert each value into a corresponding address. */
1308 for (i = 0; i < numargs; i++)
1309 addrs[i] = value_as_address (args[i]);
1312 /* Assume that the single arg[0] is an address, use that to identify
1313 a frame with a matching ID. Should this also accept stack/pc or
1314 stack/pc/special. */
1317 struct frame_id id = frame_id_build_wild (addrs[0]);
1318 struct frame_info *fid;
1320 /* If (s)he specifies the frame with an address, he deserves
1321 what (s)he gets. Still, give the highest one that matches.
1322 (NOTE: cagney/2004-10-29: Why highest, or outer-most, I don't
1324 for (fid = get_current_frame ();
1326 fid = get_prev_frame (fid))
1328 if (frame_id_eq (id, get_frame_id (fid)))
1330 struct frame_info *prev_frame;
1334 prev_frame = get_prev_frame (fid);
1336 || !frame_id_eq (id, get_frame_id (prev_frame)))
1345 /* We couldn't identify the frame as an existing frame, but
1346 perhaps we can create one with a single argument. */
1348 return create_new_frame (addrs[0], 0);
1349 else if (numargs == 2)
1350 return create_new_frame (addrs[0], addrs[1]);
1352 error (_("Too many args in frame specification"));
1355 static struct frame_info *
1356 parse_frame_specification (char *frame_exp)
1358 return parse_frame_specification_1 (frame_exp, NULL, NULL);
1361 /* Print verbosely the selected frame or the frame at address
1362 ADDR_EXP. Absolutely all information in the frame is printed. */
1365 frame_info (char *addr_exp, int from_tty)
1367 struct frame_info *fi;
1368 struct symtab_and_line sal;
1369 struct symbol *func;
1371 struct frame_info *calling_frame_info;
1373 const char *funname = 0;
1374 enum language funlang = language_unknown;
1375 const char *pc_regname;
1376 int selected_frame_p;
1377 struct gdbarch *gdbarch;
1378 struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
1381 CORE_ADDR caller_pc;
1383 fi = parse_frame_specification_1 (addr_exp, "No stack.", &selected_frame_p);
1384 gdbarch = get_frame_arch (fi);
1386 /* Name of the value returned by get_frame_pc(). Per comments, "pc"
1387 is not a good name. */
1388 if (gdbarch_pc_regnum (gdbarch) >= 0)
1389 /* OK, this is weird. The gdbarch_pc_regnum hardware register's value can
1390 easily not match that of the internal value returned by
1392 pc_regname = gdbarch_register_name (gdbarch, gdbarch_pc_regnum (gdbarch));
1394 /* But then, this is weird to. Even without gdbarch_pc_regnum, an
1395 architectures will often have a hardware register called "pc",
1396 and that register's value, again, can easily not match
1400 frame_pc_p = get_frame_pc_if_available (fi, &frame_pc);
1401 find_frame_sal (fi, &sal);
1402 func = get_frame_function (fi);
1406 funname = SYMBOL_PRINT_NAME (func);
1407 funlang = SYMBOL_LANGUAGE (func);
1408 if (funlang == language_cplus)
1410 /* It seems appropriate to use SYMBOL_PRINT_NAME() here,
1411 to display the demangled name that we already have
1412 stored in the symbol table, but we stored a version
1413 with DMGL_PARAMS turned on, and here we don't want to
1414 display parameters. So remove the parameters. */
1415 char *func_only = cp_remove_params (funname);
1419 funname = func_only;
1420 make_cleanup (xfree, func_only);
1424 else if (frame_pc_p)
1426 struct minimal_symbol *msymbol;
1428 msymbol = lookup_minimal_symbol_by_pc (frame_pc);
1429 if (msymbol != NULL)
1431 funname = SYMBOL_PRINT_NAME (msymbol);
1432 funlang = SYMBOL_LANGUAGE (msymbol);
1435 calling_frame_info = get_prev_frame (fi);
1437 if (selected_frame_p && frame_relative_level (fi) >= 0)
1439 printf_filtered (_("Stack level %d, frame at "),
1440 frame_relative_level (fi));
1444 printf_filtered (_("Stack frame at "));
1446 fputs_filtered (paddress (gdbarch, get_frame_base (fi)), gdb_stdout);
1447 printf_filtered (":\n");
1448 printf_filtered (" %s = ", pc_regname);
1450 fputs_filtered (paddress (gdbarch, get_frame_pc (fi)), gdb_stdout);
1452 fputs_filtered ("<unavailable>", gdb_stdout);
1457 printf_filtered (" in ");
1458 fprintf_symbol_filtered (gdb_stdout, funname, funlang,
1459 DMGL_ANSI | DMGL_PARAMS);
1463 printf_filtered (" (%s:%d)", sal.symtab->filename, sal.line);
1464 puts_filtered ("; ");
1466 printf_filtered ("saved %s ", pc_regname);
1467 if (frame_unwind_caller_pc_if_available (fi, &caller_pc))
1468 fputs_filtered (paddress (gdbarch, caller_pc), gdb_stdout);
1470 fputs_filtered ("<unavailable>", gdb_stdout);
1471 printf_filtered ("\n");
1473 if (calling_frame_info == NULL)
1475 enum unwind_stop_reason reason;
1477 reason = get_frame_unwind_stop_reason (fi);
1478 if (reason != UNWIND_NO_REASON)
1479 printf_filtered (_(" Outermost frame: %s\n"),
1480 frame_stop_reason_string (reason));
1482 else if (get_frame_type (fi) == TAILCALL_FRAME)
1483 puts_filtered (" tail call frame");
1484 else if (get_frame_type (fi) == INLINE_FRAME)
1485 printf_filtered (" inlined into frame %d",
1486 frame_relative_level (get_prev_frame (fi)));
1489 printf_filtered (" called by frame at ");
1490 fputs_filtered (paddress (gdbarch, get_frame_base (calling_frame_info)),
1493 if (get_next_frame (fi) && calling_frame_info)
1494 puts_filtered (",");
1496 if (get_next_frame (fi))
1498 printf_filtered (" caller of frame at ");
1499 fputs_filtered (paddress (gdbarch, get_frame_base (get_next_frame (fi))),
1502 if (get_next_frame (fi) || calling_frame_info)
1503 puts_filtered ("\n");
1506 printf_filtered (" source language %s.\n",
1507 language_str (s->language));
1510 /* Address of the argument list for this frame, or 0. */
1511 CORE_ADDR arg_list = get_frame_args_address (fi);
1512 /* Number of args for this frame, or -1 if unknown. */
1516 printf_filtered (" Arglist at unknown address.\n");
1519 printf_filtered (" Arglist at ");
1520 fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout);
1521 printf_filtered (",");
1523 if (!gdbarch_frame_num_args_p (gdbarch))
1526 puts_filtered (" args: ");
1530 numargs = gdbarch_frame_num_args (gdbarch, fi);
1531 gdb_assert (numargs >= 0);
1533 puts_filtered (" no args.");
1534 else if (numargs == 1)
1535 puts_filtered (" 1 arg: ");
1537 printf_filtered (" %d args: ", numargs);
1539 print_frame_args (func, fi, numargs, gdb_stdout);
1540 puts_filtered ("\n");
1544 /* Address of the local variables for this frame, or 0. */
1545 CORE_ADDR arg_list = get_frame_locals_address (fi);
1548 printf_filtered (" Locals at unknown address,");
1551 printf_filtered (" Locals at ");
1552 fputs_filtered (paddress (gdbarch, arg_list), gdb_stdout);
1553 printf_filtered (",");
1557 /* Print as much information as possible on the location of all the
1560 enum lval_type lval;
1569 /* The sp is special; what's displayed isn't the save address, but
1570 the value of the previous frame's sp. This is a legacy thing,
1571 at one stage the frame cached the previous frame's SP instead
1572 of its address, hence it was easiest to just display the cached
1574 if (gdbarch_sp_regnum (gdbarch) >= 0)
1576 /* Find out the location of the saved stack pointer with out
1577 actually evaluating it. */
1578 frame_register_unwind (fi, gdbarch_sp_regnum (gdbarch),
1579 &optimized, &unavailable, &lval, &addr,
1581 if (!optimized && !unavailable && lval == not_lval)
1583 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1584 int sp_size = register_size (gdbarch, gdbarch_sp_regnum (gdbarch));
1585 gdb_byte value[MAX_REGISTER_SIZE];
1588 frame_register_unwind (fi, gdbarch_sp_regnum (gdbarch),
1589 &optimized, &unavailable, &lval, &addr,
1591 /* NOTE: cagney/2003-05-22: This is assuming that the
1592 stack pointer was packed as an unsigned integer. That
1593 may or may not be valid. */
1594 sp = extract_unsigned_integer (value, sp_size, byte_order);
1595 printf_filtered (" Previous frame's sp is ");
1596 fputs_filtered (paddress (gdbarch, sp), gdb_stdout);
1597 printf_filtered ("\n");
1600 else if (!optimized && !unavailable && lval == lval_memory)
1602 printf_filtered (" Previous frame's sp at ");
1603 fputs_filtered (paddress (gdbarch, addr), gdb_stdout);
1604 printf_filtered ("\n");
1607 else if (!optimized && !unavailable && lval == lval_register)
1609 printf_filtered (" Previous frame's sp in %s\n",
1610 gdbarch_register_name (gdbarch, realnum));
1613 /* else keep quiet. */
1617 numregs = gdbarch_num_regs (gdbarch)
1618 + gdbarch_num_pseudo_regs (gdbarch);
1619 for (i = 0; i < numregs; i++)
1620 if (i != gdbarch_sp_regnum (gdbarch)
1621 && gdbarch_register_reggroup_p (gdbarch, i, all_reggroup))
1623 /* Find out the location of the saved register without
1624 fetching the corresponding value. */
1625 frame_register_unwind (fi, i, &optimized, &unavailable,
1626 &lval, &addr, &realnum, NULL);
1627 /* For moment, only display registers that were saved on the
1629 if (!optimized && !unavailable && lval == lval_memory)
1632 puts_filtered (" Saved registers:\n ");
1634 puts_filtered (",");
1636 printf_filtered (" %s at ",
1637 gdbarch_register_name (gdbarch, i));
1638 fputs_filtered (paddress (gdbarch, addr), gdb_stdout);
1642 if (count || need_nl)
1643 puts_filtered ("\n");
1646 do_cleanups (back_to);
1649 /* Print briefly all stack frames or just the innermost COUNT_EXP
1653 backtrace_command_1 (char *count_exp, int show_locals, int from_tty)
1655 struct frame_info *fi;
1658 struct frame_info *trailing;
1661 if (!target_has_stack)
1662 error (_("No stack."));
1664 /* The following code must do two things. First, it must set the
1665 variable TRAILING to the frame from which we should start
1666 printing. Second, it must set the variable count to the number
1667 of frames which we should print, or -1 if all of them. */
1668 trailing = get_current_frame ();
1673 count = parse_and_eval_long (count_exp);
1676 struct frame_info *current;
1681 while (current && count--)
1684 current = get_prev_frame (current);
1687 /* Will stop when CURRENT reaches the top of the stack.
1688 TRAILING will be COUNT below it. */
1692 trailing = get_prev_frame (trailing);
1693 current = get_prev_frame (current);
1705 /* Read in symbols for all of the frames. Need to do this in a
1706 separate pass so that "Reading in symbols for xxx" messages
1707 don't screw up the appearance of the backtrace. Also if
1708 people have strong opinions against reading symbols for
1709 backtrace this may have to be an option. */
1711 for (fi = trailing; fi != NULL && i--; fi = get_prev_frame (fi))
1716 pc = get_frame_address_in_block (fi);
1717 find_pc_sect_symtab_via_partial (pc, find_pc_mapped_section (pc));
1721 for (i = 0, fi = trailing; fi && count--; i++, fi = get_prev_frame (fi))
1725 /* Don't use print_stack_frame; if an error() occurs it probably
1726 means further attempts to backtrace would fail (on the other
1727 hand, perhaps the code does or could be fixed to make sure
1728 the frame->prev field gets set to NULL in that case). */
1729 print_frame_info (fi, 1, LOCATION, 1);
1732 struct frame_id frame_id = get_frame_id (fi);
1734 print_frame_local_vars (fi, 1, gdb_stdout);
1736 /* print_frame_local_vars invalidates FI. */
1737 fi = frame_find_by_id (frame_id);
1741 warning (_("Unable to restore previously selected frame."));
1746 /* Save the last frame to check for error conditions. */
1750 /* If we've stopped before the end, mention that. */
1752 printf_filtered (_("(More stack frames follow...)\n"));
1754 /* If we've run out of frames, and the reason appears to be an error
1755 condition, print it. */
1756 if (fi == NULL && trailing != NULL)
1758 enum unwind_stop_reason reason;
1760 reason = get_frame_unwind_stop_reason (trailing);
1761 if (reason >= UNWIND_FIRST_ERROR)
1762 printf_filtered (_("Backtrace stopped: %s\n"),
1763 frame_stop_reason_string (reason));
1768 backtrace_command (char *arg, int from_tty)
1770 struct cleanup *old_chain = make_cleanup (null_cleanup, NULL);
1771 int fulltrace_arg = -1, arglen = 0, argc = 0;
1778 argv = gdb_buildargv (arg);
1779 make_cleanup_freeargv (argv);
1781 for (i = 0; argv[i]; i++)
1785 for (j = 0; j < strlen (argv[i]); j++)
1786 argv[i][j] = tolower (argv[i][j]);
1788 if (fulltrace_arg < 0 && subset_compare (argv[i], "full"))
1789 fulltrace_arg = argc;
1792 arglen += strlen (argv[i]);
1797 if (fulltrace_arg >= 0)
1801 arg = xmalloc (arglen + 1);
1802 make_cleanup (xfree, arg);
1804 for (i = 0; i < (argc + 1); i++)
1806 if (i != fulltrace_arg)
1808 strcat (arg, argv[i]);
1818 backtrace_command_1 (arg, fulltrace_arg >= 0 /* show_locals */, from_tty);
1820 do_cleanups (old_chain);
1824 backtrace_full_command (char *arg, int from_tty)
1826 backtrace_command_1 (arg, 1 /* show_locals */, from_tty);
1830 /* Iterate over the local variables of a block B, calling CB with
1834 iterate_over_block_locals (struct block *b,
1835 iterate_over_block_arg_local_vars_cb cb,
1838 struct block_iterator iter;
1841 ALL_BLOCK_SYMBOLS (b, iter, sym)
1843 switch (SYMBOL_CLASS (sym))
1849 if (SYMBOL_IS_ARGUMENT (sym))
1851 if (SYMBOL_DOMAIN (sym) == COMMON_BLOCK_DOMAIN)
1853 (*cb) (SYMBOL_PRINT_NAME (sym), sym, cb_data);
1857 /* Ignore symbols which are not locals. */
1864 /* Same, but print labels. */
1867 /* Commented out, as the code using this function has also been
1868 commented out. FIXME:brobecker/2009-01-13: Find out why the code
1869 was commented out in the first place. The discussion introducing
1870 this change (2007-12-04: Support lexical blocks and function bodies
1871 that occupy non-contiguous address ranges) did not explain why
1872 this change was made. */
1874 print_block_frame_labels (struct gdbarch *gdbarch, struct block *b,
1875 int *have_default, struct ui_file *stream)
1877 struct block_iterator iter;
1879 int values_printed = 0;
1881 ALL_BLOCK_SYMBOLS (b, iter, sym)
1883 if (strcmp (SYMBOL_LINKAGE_NAME (sym), "default") == 0)
1889 if (SYMBOL_CLASS (sym) == LOC_LABEL)
1891 struct symtab_and_line sal;
1892 struct value_print_options opts;
1894 sal = find_pc_line (SYMBOL_VALUE_ADDRESS (sym), 0);
1896 fputs_filtered (SYMBOL_PRINT_NAME (sym), stream);
1897 get_user_print_options (&opts);
1898 if (opts.addressprint)
1900 fprintf_filtered (stream, " ");
1901 fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (sym)),
1904 fprintf_filtered (stream, " in file %s, line %d\n",
1905 sal.symtab->filename, sal.line);
1909 return values_printed;
1913 /* Iterate over all the local variables in block B, including all its
1914 superblocks, stopping when the top-level block is reached. */
1917 iterate_over_block_local_vars (struct block *block,
1918 iterate_over_block_arg_local_vars_cb cb,
1923 iterate_over_block_locals (block, cb, cb_data);
1924 /* After handling the function's top-level block, stop. Don't
1925 continue to its superblock, the block of per-file
1927 if (BLOCK_FUNCTION (block))
1929 block = BLOCK_SUPERBLOCK (block);
1933 /* Data to be passed around in the calls to the locals and args
1936 struct print_variable_and_value_data
1938 struct frame_id frame_id;
1940 struct ui_file *stream;
1944 /* The callback for the locals and args iterators. */
1947 do_print_variable_and_value (const char *print_name,
1951 struct print_variable_and_value_data *p = cb_data;
1952 struct frame_info *frame;
1954 frame = frame_find_by_id (p->frame_id);
1957 warning (_("Unable to restore previously selected frame."));
1961 print_variable_and_value (print_name, sym, frame, p->stream, p->num_tabs);
1963 /* print_variable_and_value invalidates FRAME. */
1966 p->values_printed = 1;
1969 /* Print all variables from the innermost up to the function block of FRAME.
1970 Print them with values to STREAM indented by NUM_TABS.
1972 This function will invalidate FRAME. */
1975 print_frame_local_vars (struct frame_info *frame, int num_tabs,
1976 struct ui_file *stream)
1978 struct print_variable_and_value_data cb_data;
1979 struct block *block;
1982 if (!get_frame_pc_if_available (frame, &pc))
1984 fprintf_filtered (stream,
1985 _("PC unavailable, cannot determine locals.\n"));
1989 block = get_frame_block (frame, 0);
1992 fprintf_filtered (stream, "No symbol table info available.\n");
1996 cb_data.frame_id = get_frame_id (frame);
1997 cb_data.num_tabs = 4 * num_tabs;
1998 cb_data.stream = stream;
1999 cb_data.values_printed = 0;
2001 iterate_over_block_local_vars (block,
2002 do_print_variable_and_value,
2005 /* do_print_variable_and_value invalidates FRAME. */
2008 if (!cb_data.values_printed)
2009 fprintf_filtered (stream, _("No locals.\n"));
2013 locals_info (char *args, int from_tty)
2015 print_frame_local_vars (get_selected_frame (_("No frame selected.")),
2019 /* Iterate over all the argument variables in block B.
2021 Returns 1 if any argument was walked; 0 otherwise. */
2024 iterate_over_block_arg_vars (struct block *b,
2025 iterate_over_block_arg_local_vars_cb cb,
2028 struct block_iterator iter;
2029 struct symbol *sym, *sym2;
2031 ALL_BLOCK_SYMBOLS (b, iter, sym)
2033 /* Don't worry about things which aren't arguments. */
2034 if (SYMBOL_IS_ARGUMENT (sym))
2036 /* We have to look up the symbol because arguments can have
2037 two entries (one a parameter, one a local) and the one we
2038 want is the local, which lookup_symbol will find for us.
2039 This includes gcc1 (not gcc2) on the sparc when passing a
2040 small structure and gcc2 when the argument type is float
2041 and it is passed as a double and converted to float by
2042 the prologue (in the latter case the type of the LOC_ARG
2043 symbol is double and the type of the LOC_LOCAL symbol is
2044 float). There are also LOC_ARG/LOC_REGISTER pairs which
2045 are not combined in symbol-reading. */
2047 sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
2048 b, VAR_DOMAIN, NULL);
2049 (*cb) (SYMBOL_PRINT_NAME (sym), sym2, cb_data);
2054 /* Print all argument variables of the function of FRAME.
2055 Print them with values to STREAM.
2057 This function will invalidate FRAME. */
2060 print_frame_arg_vars (struct frame_info *frame, struct ui_file *stream)
2062 struct print_variable_and_value_data cb_data;
2063 struct symbol *func;
2066 if (!get_frame_pc_if_available (frame, &pc))
2068 fprintf_filtered (stream, _("PC unavailable, cannot determine args.\n"));
2072 func = get_frame_function (frame);
2075 fprintf_filtered (stream, _("No symbol table info available.\n"));
2079 cb_data.frame_id = get_frame_id (frame);
2080 cb_data.num_tabs = 0;
2081 cb_data.stream = gdb_stdout;
2082 cb_data.values_printed = 0;
2084 iterate_over_block_arg_vars (SYMBOL_BLOCK_VALUE (func),
2085 do_print_variable_and_value, &cb_data);
2087 /* do_print_variable_and_value invalidates FRAME. */
2090 if (!cb_data.values_printed)
2091 fprintf_filtered (stream, _("No arguments.\n"));
2095 args_info (char *ignore, int from_tty)
2097 print_frame_arg_vars (get_selected_frame (_("No frame selected.")),
2103 args_plus_locals_info (char *ignore, int from_tty)
2105 args_info (ignore, from_tty);
2106 locals_info (ignore, from_tty);
2110 /* Select frame FRAME. Also print the stack frame and show the source
2111 if this is the tui version. */
2113 select_and_print_frame (struct frame_info *frame)
2115 select_frame (frame);
2117 print_stack_frame (frame, 1, SRC_AND_LOC);
2120 /* Return the symbol-block in which the selected frame is executing.
2121 Can return zero under various legitimate circumstances.
2123 If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the relevant
2124 code address within the block returned. We use this to decide
2125 which macros are in scope. */
2128 get_selected_block (CORE_ADDR *addr_in_block)
2130 if (!has_stack_frames ())
2133 return get_frame_block (get_selected_frame (NULL), addr_in_block);
2136 /* Find a frame a certain number of levels away from FRAME.
2137 LEVEL_OFFSET_PTR points to an int containing the number of levels.
2138 Positive means go to earlier frames (up); negative, the reverse.
2139 The int that contains the number of levels is counted toward
2140 zero as the frames for those levels are found.
2141 If the top or bottom frame is reached, that frame is returned,
2142 but the final value of *LEVEL_OFFSET_PTR is nonzero and indicates
2143 how much farther the original request asked to go. */
2146 find_relative_frame (struct frame_info *frame, int *level_offset_ptr)
2148 /* Going up is simple: just call get_prev_frame enough times or
2149 until the initial frame is reached. */
2150 while (*level_offset_ptr > 0)
2152 struct frame_info *prev = get_prev_frame (frame);
2156 (*level_offset_ptr)--;
2160 /* Going down is just as simple. */
2161 while (*level_offset_ptr < 0)
2163 struct frame_info *next = get_next_frame (frame);
2167 (*level_offset_ptr)++;
2174 /* The "select_frame" command. With no argument this is a NOP.
2175 Select the frame at level LEVEL_EXP if it is a valid level.
2176 Otherwise, treat LEVEL_EXP as an address expression and select it.
2178 See parse_frame_specification for more info on proper frame
2182 select_frame_command (char *level_exp, int from_tty)
2184 select_frame (parse_frame_specification_1 (level_exp, "No stack.", NULL));
2187 /* The "frame" command. With no argument, print the selected frame
2188 briefly. With an argument, behave like select_frame and then print
2189 the selected frame. */
2192 frame_command (char *level_exp, int from_tty)
2194 select_frame_command (level_exp, from_tty);
2195 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
2198 /* The XDB Compatibility command to print the current frame. */
2201 current_frame_command (char *level_exp, int from_tty)
2203 print_stack_frame (get_selected_frame (_("No stack.")), 1, SRC_AND_LOC);
2206 /* Select the frame up one or COUNT_EXP stack levels from the
2207 previously selected frame, and print it briefly. */
2210 up_silently_base (char *count_exp)
2212 struct frame_info *frame;
2216 count = parse_and_eval_long (count_exp);
2218 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
2219 if (count != 0 && count_exp == NULL)
2220 error (_("Initial frame selected; you cannot go up."));
2221 select_frame (frame);
2225 up_silently_command (char *count_exp, int from_tty)
2227 up_silently_base (count_exp);
2231 up_command (char *count_exp, int from_tty)
2233 up_silently_base (count_exp);
2234 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
2237 /* Select the frame down one or COUNT_EXP stack levels from the previously
2238 selected frame, and print it briefly. */
2241 down_silently_base (char *count_exp)
2243 struct frame_info *frame;
2247 count = -parse_and_eval_long (count_exp);
2249 frame = find_relative_frame (get_selected_frame ("No stack."), &count);
2250 if (count != 0 && count_exp == NULL)
2252 /* We only do this if COUNT_EXP is not specified. That way
2253 "down" means to really go down (and let me know if that is
2254 impossible), but "down 9999" can be used to mean go all the
2255 way down without getting an error. */
2257 error (_("Bottom (innermost) frame selected; you cannot go down."));
2260 select_frame (frame);
2264 down_silently_command (char *count_exp, int from_tty)
2266 down_silently_base (count_exp);
2270 down_command (char *count_exp, int from_tty)
2272 down_silently_base (count_exp);
2273 print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
2278 return_command (char *retval_exp, int from_tty)
2280 struct frame_info *thisframe;
2281 struct gdbarch *gdbarch;
2282 struct symbol *thisfun;
2283 struct value *return_value = NULL;
2284 struct value *function = NULL;
2285 const char *query_prefix = "";
2287 thisframe = get_selected_frame ("No selected frame.");
2288 thisfun = get_frame_function (thisframe);
2289 gdbarch = get_frame_arch (thisframe);
2291 if (get_frame_type (get_current_frame ()) == INLINE_FRAME)
2292 error (_("Can not force return from an inlined function."));
2294 /* Compute the return value. If the computation triggers an error,
2295 let it bail. If the return type can't be handled, set
2296 RETURN_VALUE to NULL, and QUERY_PREFIX to an informational
2300 struct expression *retval_expr = parse_expression (retval_exp);
2301 struct cleanup *old_chain = make_cleanup (xfree, retval_expr);
2302 struct type *return_type = NULL;
2304 /* Compute the return value. Should the computation fail, this
2305 call throws an error. */
2306 return_value = evaluate_expression (retval_expr);
2308 /* Cast return value to the return type of the function. Should
2309 the cast fail, this call throws an error. */
2310 if (thisfun != NULL)
2311 return_type = TYPE_TARGET_TYPE (SYMBOL_TYPE (thisfun));
2312 if (return_type == NULL)
2314 if (retval_expr->elts[0].opcode != UNOP_CAST
2315 && retval_expr->elts[0].opcode != UNOP_CAST_TYPE)
2316 error (_("Return value type not available for selected "
2318 "Please use an explicit cast of the value to return."));
2319 return_type = value_type (return_value);
2321 do_cleanups (old_chain);
2322 CHECK_TYPEDEF (return_type);
2323 return_value = value_cast (return_type, return_value);
2325 /* Make sure the value is fully evaluated. It may live in the
2326 stack frame we're about to pop. */
2327 if (value_lazy (return_value))
2328 value_fetch_lazy (return_value);
2330 if (thisfun != NULL)
2331 function = read_var_value (thisfun, thisframe);
2333 if (TYPE_CODE (return_type) == TYPE_CODE_VOID)
2334 /* If the return-type is "void", don't try to find the
2335 return-value's location. However, do still evaluate the
2336 return expression so that, even when the expression result
2337 is discarded, side effects such as "return i++" still
2339 return_value = NULL;
2340 else if (thisfun != NULL
2341 && using_struct_return (gdbarch, function, return_type))
2343 query_prefix = "The location at which to store the "
2344 "function's return value is unknown.\n"
2345 "If you continue, the return value "
2346 "that you specified will be ignored.\n";
2347 return_value = NULL;
2351 /* Does an interactive user really want to do this? Include
2352 information, such as how well GDB can handle the return value, in
2353 the query message. */
2358 if (thisfun == NULL)
2359 confirmed = query (_("%sMake selected stack frame return now? "),
2362 confirmed = query (_("%sMake %s return now? "), query_prefix,
2363 SYMBOL_PRINT_NAME (thisfun));
2365 error (_("Not confirmed"));
2368 /* Discard the selected frame and all frames inner-to it. */
2369 frame_pop (get_selected_frame (NULL));
2371 /* Store RETURN_VALUE in the just-returned register set. */
2372 if (return_value != NULL)
2374 struct type *return_type = value_type (return_value);
2375 struct gdbarch *gdbarch = get_regcache_arch (get_current_regcache ());
2377 gdb_assert (gdbarch_return_value (gdbarch, function, return_type, NULL,
2379 == RETURN_VALUE_REGISTER_CONVENTION);
2380 gdbarch_return_value (gdbarch, function, return_type,
2381 get_current_regcache (), NULL /*read*/,
2382 value_contents (return_value) /*write*/);
2385 /* If we are at the end of a call dummy now, pop the dummy frame
2387 if (get_frame_type (get_current_frame ()) == DUMMY_FRAME)
2388 frame_pop (get_current_frame ());
2390 /* If interactive, print the frame that is now current. */
2392 frame_command ("0", 1);
2394 select_frame_command ("0", 0);
2397 /* Sets the scope to input function name, provided that the function
2398 is within the current stack frame. */
2400 struct function_bounds
2402 CORE_ADDR low, high;
2406 func_command (char *arg, int from_tty)
2408 struct frame_info *frame;
2410 struct symtabs_and_lines sals;
2413 struct function_bounds *func_bounds = NULL;
2414 struct cleanup *cleanups;
2419 frame = parse_frame_specification ("0");
2420 sals = decode_line_with_current_source (arg, DECODE_LINE_FUNFIRSTLINE);
2421 cleanups = make_cleanup (xfree, sals.sals);
2422 func_bounds = (struct function_bounds *) xmalloc (
2423 sizeof (struct function_bounds) * sals.nelts);
2424 make_cleanup (xfree, func_bounds);
2425 for (i = 0; (i < sals.nelts && !found); i++)
2427 if (sals.sals[i].pspace != current_program_space)
2428 func_bounds[i].low = func_bounds[i].high = 0;
2429 else if (sals.sals[i].pc == 0
2430 || find_pc_partial_function (sals.sals[i].pc, NULL,
2431 &func_bounds[i].low,
2432 &func_bounds[i].high) == 0)
2434 func_bounds[i].low = func_bounds[i].high = 0;
2440 for (i = 0; (i < sals.nelts && !found); i++)
2441 found = (get_frame_pc (frame) >= func_bounds[i].low
2442 && get_frame_pc (frame) < func_bounds[i].high);
2446 frame = find_relative_frame (frame, &level);
2449 while (!found && level == 0);
2451 do_cleanups (cleanups);
2454 printf_filtered (_("'%s' not within current stack frame.\n"), arg);
2455 else if (frame != get_selected_frame (NULL))
2456 select_and_print_frame (frame);
2459 /* Gets the language of the current frame. */
2462 get_frame_language (void)
2464 struct frame_info *frame = deprecated_safe_get_selected_frame ();
2468 volatile struct gdb_exception ex;
2472 /* We determine the current frame language by looking up its
2473 associated symtab. To retrieve this symtab, we use the frame
2474 PC. However we cannot use the frame PC as is, because it
2475 usually points to the instruction following the "call", which
2476 is sometimes the first instruction of another function. So
2477 we rely on get_frame_address_in_block(), it provides us with
2478 a PC that is guaranteed to be inside the frame's code
2481 TRY_CATCH (ex, RETURN_MASK_ERROR)
2483 pc = get_frame_address_in_block (frame);
2487 if (ex.error != NOT_AVAILABLE_ERROR)
2488 throw_exception (ex);
2492 s = find_pc_symtab (pc);
2498 return language_unknown;
2502 /* Provide a prototype to silence -Wmissing-prototypes. */
2503 void _initialize_stack (void);
2506 _initialize_stack (void)
2508 add_com ("return", class_stack, return_command, _("\
2509 Make selected stack frame return to its caller.\n\
2510 Control remains in the debugger, but when you continue\n\
2511 execution will resume in the frame above the one now selected.\n\
2512 If an argument is given, it is an expression for the value to return."));
2514 add_com ("up", class_stack, up_command, _("\
2515 Select and print stack frame that called this one.\n\
2516 An argument says how many frames up to go."));
2517 add_com ("up-silently", class_support, up_silently_command, _("\
2518 Same as the `up' command, but does not print anything.\n\
2519 This is useful in command scripts."));
2521 add_com ("down", class_stack, down_command, _("\
2522 Select and print stack frame called by this one.\n\
2523 An argument says how many frames down to go."));
2524 add_com_alias ("do", "down", class_stack, 1);
2525 add_com_alias ("dow", "down", class_stack, 1);
2526 add_com ("down-silently", class_support, down_silently_command, _("\
2527 Same as the `down' command, but does not print anything.\n\
2528 This is useful in command scripts."));
2530 add_com ("frame", class_stack, frame_command, _("\
2531 Select and print a stack frame.\nWith no argument, \
2532 print the selected stack frame. (See also \"info frame\").\n\
2533 An argument specifies the frame to select.\n\
2534 It can be a stack frame number or the address of the frame.\n\
2535 With argument, nothing is printed if input is coming from\n\
2536 a command file or a user-defined command."));
2538 add_com_alias ("f", "frame", class_stack, 1);
2542 add_com ("L", class_stack, current_frame_command,
2543 _("Print the current stack frame.\n"));
2544 add_com_alias ("V", "frame", class_stack, 1);
2546 add_com ("select-frame", class_stack, select_frame_command, _("\
2547 Select a stack frame without printing anything.\n\
2548 An argument specifies the frame to select.\n\
2549 It can be a stack frame number or the address of the frame.\n"));
2551 add_com ("backtrace", class_stack, backtrace_command, _("\
2552 Print backtrace of all stack frames, or innermost COUNT frames.\n\
2553 With a negative argument, print outermost -COUNT frames.\nUse of the \
2554 'full' qualifier also prints the values of the local variables.\n"));
2555 add_com_alias ("bt", "backtrace", class_stack, 0);
2558 add_com_alias ("t", "backtrace", class_stack, 0);
2559 add_com ("T", class_stack, backtrace_full_command, _("\
2560 Print backtrace of all stack frames, or innermost COUNT frames\n\
2561 and the values of the local variables.\n\
2562 With a negative argument, print outermost -COUNT frames.\n\
2563 Usage: T <count>\n"));
2566 add_com_alias ("where", "backtrace", class_alias, 0);
2567 add_info ("stack", backtrace_command,
2568 _("Backtrace of the stack, or innermost COUNT frames."));
2569 add_info_alias ("s", "stack", 1);
2570 add_info ("frame", frame_info,
2571 _("All about selected stack frame, or frame at ADDR."));
2572 add_info_alias ("f", "frame", 1);
2573 add_info ("locals", locals_info,
2574 _("Local variables of current stack frame."));
2575 add_info ("args", args_info,
2576 _("Argument variables of current stack frame."));
2578 add_com ("l", class_info, args_plus_locals_info,
2579 _("Argument and local variables of current stack frame."));
2582 add_com ("func", class_stack, func_command, _("\
2583 Select the stack frame that contains <func>.\n\
2584 Usage: func <name>\n"));
2586 add_setshow_enum_cmd ("frame-arguments", class_stack,
2587 print_frame_arguments_choices, &print_frame_arguments,
2588 _("Set printing of non-scalar frame arguments"),
2589 _("Show printing of non-scalar frame arguments"),
2590 NULL, NULL, NULL, &setprintlist, &showprintlist);
2592 add_setshow_auto_boolean_cmd ("disassemble-next-line", class_stack,
2593 &disassemble_next_line, _("\
2594 Set whether to disassemble next source line or insn when execution stops."),
2596 Show whether to disassemble next source line or insn when execution stops."),
2598 If ON, GDB will display disassembly of the next source line, in addition\n\
2599 to displaying the source line itself. If the next source line cannot\n\
2600 be displayed (e.g., source is unavailable or there's no line info), GDB\n\
2601 will display disassembly of next instruction instead of showing the\n\
2603 If AUTO, display disassembly of next instruction only if the source line\n\
2604 cannot be displayed.\n\
2605 If OFF (which is the default), never display the disassembly of the next\n\
2608 show_disassemble_next_line,
2609 &setlist, &showlist);
2610 disassemble_next_line = AUTO_BOOLEAN_FALSE;
2612 add_setshow_enum_cmd ("entry-values", class_stack,
2613 print_entry_values_choices, &print_entry_values,
2614 _("Set printing of function arguments at function "
2616 _("Show printing of function arguments at function "
2619 GDB can sometimes determine the values of function arguments at entry,\n\
2620 in addition to their current values. This option tells GDB whether\n\
2621 to print the current value, the value at entry (marked as val@entry),\n\
2622 or both. Note that one or both of these values may be <optimized out>."),
2623 NULL, NULL, &setprintlist, &showprintlist);