gdb/mi/mi-cmd-stack.c

   1 /* MI Command Set - stack commands.
   2    Copyright (C) 2000-2013 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions (a Red Hat company).
   4
   5    This file is part of GDB.
   6
   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.
  11
  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.
  16
  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/>.  */
  19
  20 #include "defs.h"
  21 #include "target.h"
  22 #include "frame.h"
  23 #include "value.h"
  24 #include "mi-cmds.h"
  25 #include "ui-out.h"
  26 #include "symtab.h"
  27 #include "block.h"
  28 #include "stack.h"
  29 #include "dictionary.h"
  30 #include "gdb_string.h"
  31 #include "language.h"
  32 #include "valprint.h"
  33 #include "exceptions.h"
  34 #include "utils.h"
  35 #include "mi-getopt.h"
  36 #include "python/python.h"
  37 #include <ctype.h>
  38 #include "mi-parse.h"
  39
  40 enum what_to_list { locals, arguments, all };
  41
  42 static void list_args_or_locals (enum what_to_list what,
  43                                  enum print_values values,
  44                                  struct frame_info *fi,
  45                                  int skip_unavailable);
  46
  47 /* True if we want to allow Python-based frame filters.  */
  48 static int frame_filters = 0;
  49
  50 void
  51 mi_cmd_enable_frame_filters (char *command, char **argv, int argc)
  52 {
  53   if (argc != 0)
  54     error (_("-enable-frame-filters: no arguments allowed"));
  55   frame_filters = 1;
  56 }
  57
  58 /* Print a list of the stack frames.  Args can be none, in which case
  59    we want to print the whole backtrace, or a pair of numbers
  60    specifying the frame numbers at which to start and stop the
  61    display.  If the two numbers are equal, a single frame will be
  62    displayed.  */
  63
  64 void
  65 mi_cmd_stack_list_frames (char *command, char **argv, int argc)
  66 {
  67   int frame_low;
  68   int frame_high;
  69   int i;
  70   struct cleanup *cleanup_stack;
  71   struct frame_info *fi;
  72   enum py_bt_status result = PY_BT_ERROR;
  73   int raw_arg = 0;
  74   int oind = 0;
  75   enum opt
  76     {
  77       NO_FRAME_FILTERS
  78     };
  79   static const struct mi_opt opts[] =
  80     {
  81       {"-no-frame-filters", NO_FRAME_FILTERS, 0},
  82       { 0, 0, 0 }
  83     };
  84
  85   /* Parse arguments.  In this instance we are just looking for
  86      --no-frame-filters.  */
  87   while (1)
  88     {
  89       char *oarg;
  90       int opt = mi_getopt ("-stack-list-frames", argc, argv,
  91                            opts, &oind, &oarg);
  92       if (opt < 0)
  93         break;
  94       switch ((enum opt) opt)
  95         {
  96         case NO_FRAME_FILTERS:
  97           raw_arg = oind;
  98           break;
  99         }
 100     }
 101
 102   /* After the last option is parsed, there should either be low -
 103      high range, or no further arguments.  */
 104   if ((argc - oind != 0) && (argc - oind != 2))
 105     error (_("-stack-list-frames: Usage: [--no-frame-filters] [FRAME_LOW FRAME_HIGH]"));
 106
 107   /* If there is a range, set it.  */
 108   if (argc - oind == 2)
 109     {
 110       frame_low = atoi (argv[0 + oind]);
 111       frame_high = atoi (argv[1 + oind]);
 112     }
 113   else
 114     {
 115       /* Called with no arguments, it means we want the whole
 116          backtrace.  */
 117       frame_low = -1;
 118       frame_high = -1;
 119     }
 120
 121   /* Let's position fi on the frame at which to start the
 122      display. Could be the innermost frame if the whole stack needs
 123      displaying, or if frame_low is 0.  */
 124   for (i = 0, fi = get_current_frame ();
 125        fi && i < frame_low;
 126        i++, fi = get_prev_frame (fi));
 127
 128   if (fi == NULL)
 129     error (_("-stack-list-frames: Not enough frames in stack."));
 130
 131   cleanup_stack = make_cleanup_ui_out_list_begin_end (current_uiout, "stack");
 132
 133   if (! raw_arg && frame_filters)
 134     {
 135       int flags = PRINT_LEVEL | PRINT_FRAME_INFO;
 136       int py_frame_low = frame_low;
 137
 138       /* We cannot pass -1 to frame_low, as that would signify a
 139       relative backtrace from the tail of the stack.  So, in the case
 140       of frame_low == -1, assign and increment it.  */
 141       if (py_frame_low == -1)
 142         py_frame_low++;
 143
 144       result = apply_frame_filter (get_current_frame (), flags,
 145                                    NO_VALUES,  current_uiout,
 146                                    py_frame_low, frame_high);
 147     }
 148
 149   /* Run the inbuilt backtrace if there are no filters registered, or
 150      if "--no-frame-filters" has been specified from the command.  */
 151   if (! frame_filters || raw_arg  || result == PY_BT_NO_FILTERS)
 152     {
 153       /* Now let's print the frames up to frame_high, or until there are
 154          frames in the stack.  */
 155       for (;
 156            fi && (i <= frame_high || frame_high == -1);
 157            i++, fi = get_prev_frame (fi))
 158         {
 159           QUIT;
 160           /* Print the location and the address always, even for level 0.
 161              If args is 0, don't print the arguments.  */
 162           print_frame_info (fi, 1, LOC_AND_ADDRESS, 0 /* args */ );
 163         }
 164     }
 165
 166   do_cleanups (cleanup_stack);
 167 }
 168
 169 void
 170 mi_cmd_stack_info_depth (char *command, char **argv, int argc)
 171 {
 172   int frame_high;
 173   int i;
 174   struct frame_info *fi;
 175
 176   if (argc > 1)
 177     error (_("-stack-info-depth: Usage: [MAX_DEPTH]"));
 178
 179   if (argc == 1)
 180     frame_high = atoi (argv[0]);
 181   else
 182     /* Called with no arguments, it means we want the real depth of
 183        the stack.  */
 184     frame_high = -1;
 185
 186   for (i = 0, fi = get_current_frame ();
 187        fi && (i < frame_high || frame_high == -1);
 188        i++, fi = get_prev_frame (fi))
 189     QUIT;
 190
 191   ui_out_field_int (current_uiout, "depth", i);
 192 }
 193
 194 /* Print a list of the locals for the current frame.  With argument of
 195    0, print only the names, with argument of 1 print also the
 196    values.  */
 197
 198 void
 199 mi_cmd_stack_list_locals (char *command, char **argv, int argc)
 200 {
 201   struct frame_info *frame;
 202   int raw_arg = 0;
 203   enum py_bt_status result = PY_BT_ERROR;
 204   int print_value;
 205   int oind = 0;
 206   int skip_unavailable = 0;
 207   int i;
 208
 209   if (argc > 1)
 210     {
 211       int i;
 212       enum opt
 213       {
 214         NO_FRAME_FILTERS,
 215         SKIP_UNAVAILABLE,
 216       };
 217       static const struct mi_opt opts[] =
 218         {
 219           {"-no-frame-filters", NO_FRAME_FILTERS, 0},
 220           {"-skip-unavailable", SKIP_UNAVAILABLE, 0},
 221           { 0, 0, 0 }
 222         };
 223
 224       while (1)
 225         {
 226           char *oarg;
 227           /* Don't parse 'print-values' as an option.  */
 228           int opt = mi_getopt ("-stack-list-locals", argc - 1, argv,
 229                                opts, &oind, &oarg);
 230
 231           if (opt < 0)
 232             break;
 233           switch ((enum opt) opt)
 234             {
 235             case NO_FRAME_FILTERS:
 236               raw_arg = oind;
 237             case SKIP_UNAVAILABLE:
 238               skip_unavailable = 1;
 239               break;
 240             }
 241         }
 242     }
 243
 244   /* After the last option is parsed, there should be only
 245      'print-values'.  */
 246   if (argc - oind != 1)
 247     error (_("-stack-list-locals: Usage: [--no-frame-filters] "
 248              "[--skip-unavailable] PRINT_VALUES"));
 249
 250   frame = get_selected_frame (NULL);
 251   print_value = mi_parse_print_values (argv[oind]);
 252
 253    if (! raw_arg && frame_filters)
 254      {
 255        int flags = PRINT_LEVEL | PRINT_LOCALS;
 256
 257        result = apply_frame_filter (frame, flags, print_value,
 258                                     current_uiout, 0, 0);
 259      }
 260
 261    /* Run the inbuilt backtrace if there are no filters registered, or
 262       if "--no-frame-filters" has been specified from the command.  */
 263    if (! frame_filters || raw_arg  || result == PY_BT_NO_FILTERS)
 264      {
 265        list_args_or_locals (locals, print_value, frame,
 266                             skip_unavailable);
 267      }
 268 }
 269
 270 /* Print a list of the arguments for the current frame.  With argument
 271    of 0, print only the names, with argument of 1 print also the
 272    values.  */
 273
 274 void
 275 mi_cmd_stack_list_args (char *command, char **argv, int argc)
 276 {
 277   int frame_low;
 278   int frame_high;
 279   int i;
 280   struct frame_info *fi;
 281   struct cleanup *cleanup_stack_args;
 282   enum print_values print_values;
 283   struct ui_out *uiout = current_uiout;
 284   int raw_arg = 0;
 285   int oind = 0;
 286   int skip_unavailable = 0;
 287   enum py_bt_status result = PY_BT_ERROR;
 288   enum opt
 289   {
 290     NO_FRAME_FILTERS,
 291     SKIP_UNAVAILABLE,
 292   };
 293   static const struct mi_opt opts[] =
 294     {
 295       {"-no-frame-filters", NO_FRAME_FILTERS, 0},
 296       {"-skip-unavailable", SKIP_UNAVAILABLE, 0},
 297       { 0, 0, 0 }
 298     };
 299
 300   while (1)
 301     {
 302       char *oarg;
 303       int opt = mi_getopt_allow_unknown ("-stack-list-args", argc, argv,
 304                                          opts, &oind, &oarg);
 305
 306       if (opt < 0)
 307         break;
 308       switch ((enum opt) opt)
 309         {
 310         case NO_FRAME_FILTERS:
 311           raw_arg = oind;
 312           break;
 313         case SKIP_UNAVAILABLE:
 314           skip_unavailable = 1;
 315           break;
 316         }
 317     }
 318
 319   if (argc - oind != 1 && argc - oind != 3)
 320     error (_("-stack-list-arguments: Usage: "   \
 321              "[--no-frame-filters] [--skip-unavailable] "
 322              "PRINT_VALUES [FRAME_LOW FRAME_HIGH]"));
 323
 324   if (argc - oind == 3)
 325     {
 326       frame_low = atoi (argv[1 + oind]);
 327       frame_high = atoi (argv[2 + oind]);
 328     }
 329   else
 330     {
 331       /* Called with no arguments, it means we want args for the whole
 332          backtrace.  */
 333       frame_low = -1;
 334       frame_high = -1;
 335     }
 336
 337   print_values = mi_parse_print_values (argv[oind]);
 338
 339   /* Let's position fi on the frame at which to start the
 340      display. Could be the innermost frame if the whole stack needs
 341      displaying, or if frame_low is 0.  */
 342   for (i = 0, fi = get_current_frame ();
 343        fi && i < frame_low;
 344        i++, fi = get_prev_frame (fi));
 345
 346   if (fi == NULL)
 347     error (_("-stack-list-arguments: Not enough frames in stack."));
 348
 349   cleanup_stack_args
 350     = make_cleanup_ui_out_list_begin_end (uiout, "stack-args");
 351
 352   if (! raw_arg && frame_filters)
 353     {
 354       int flags = PRINT_LEVEL | PRINT_ARGS;
 355       int py_frame_low = frame_low;
 356
 357       /* We cannot pass -1 to frame_low, as that would signify a
 358       relative backtrace from the tail of the stack.  So, in the case
 359       of frame_low == -1, assign and increment it.  */
 360       if (py_frame_low == -1)
 361         py_frame_low++;
 362
 363       result = apply_frame_filter (get_current_frame (), flags,
 364                                    print_values, current_uiout,
 365                                    py_frame_low, frame_high);
 366     }
 367
 368      /* Run the inbuilt backtrace if there are no filters registered, or
 369       if "--no-frame-filters" has been specified from the command.  */
 370    if (! frame_filters || raw_arg  || result == PY_BT_NO_FILTERS)
 371      {
 372       /* Now let's print the frames up to frame_high, or until there are
 373          frames in the stack.  */
 374       for (;
 375            fi && (i <= frame_high || frame_high == -1);
 376            i++, fi = get_prev_frame (fi))
 377         {
 378           struct cleanup *cleanup_frame;
 379
 380           QUIT;
 381           cleanup_frame = make_cleanup_ui_out_tuple_begin_end (uiout, "frame");
 382           ui_out_field_int (uiout, "level", i);
 383           list_args_or_locals (arguments, print_values, fi, skip_unavailable);
 384           do_cleanups (cleanup_frame);
 385         }
 386     }
 387   do_cleanups (cleanup_stack_args);
 388 }
 389
 390 /* Print a list of the local variables (including arguments) for the
 391    current frame.  ARGC must be 1 and ARGV[0] specify if only the names,
 392    or both names and values of the variables must be printed.  See
 393    parse_print_value for possible values.  */
 394
 395 void
 396 mi_cmd_stack_list_variables (char *command, char **argv, int argc)
 397 {
 398   struct frame_info *frame;
 399   int raw_arg = 0;
 400   enum py_bt_status result = PY_BT_ERROR;
 401   int print_value;
 402   int oind = 0;
 403   int skip_unavailable = 0;
 404
 405   if (argc > 1)
 406     {
 407       int i;
 408       enum opt
 409       {
 410         NO_FRAME_FILTERS,
 411         SKIP_UNAVAILABLE,
 412       };
 413       static const struct mi_opt opts[] =
 414         {
 415           {"-no-frame-filters", NO_FRAME_FILTERS, 0},
 416           {"-skip-unavailable", SKIP_UNAVAILABLE, 0},
 417           { 0, 0, 0 }
 418         };
 419
 420       while (1)
 421         {
 422           char *oarg;
 423           /* Don't parse 'print-values' as an option.  */
 424           int opt = mi_getopt ("-stack-list-variables", argc - 1,
 425                                argv, opts, &oind, &oarg);
 426           if (opt < 0)
 427             break;
 428           switch ((enum opt) opt)
 429             {
 430             case NO_FRAME_FILTERS:
 431               raw_arg = oind;
 432               break;
 433             case SKIP_UNAVAILABLE:
 434               skip_unavailable = 1;
 435               break;
 436             }
 437         }
 438     }
 439
 440   /* After the last option is parsed, there should be only
 441      'print-values'.  */
 442   if (argc - oind != 1)
 443     error (_("-stack-list-variables: Usage: [--no-frame-filters] " \
 444              "[--skip-unavailable] PRINT_VALUES"));
 445
 446    frame = get_selected_frame (NULL);
 447    print_value = mi_parse_print_values (argv[oind]);
 448
 449    if (! raw_arg && frame_filters)
 450      {
 451        int flags = PRINT_LEVEL | PRINT_ARGS | PRINT_LOCALS;
 452
 453        result = apply_frame_filter (frame, flags, print_value,
 454                                     current_uiout, 0, 0);
 455      }
 456
 457    /* Run the inbuilt backtrace if there are no filters registered, or
 458       if "--no-frame-filters" has been specified from the command.  */
 459    if (! frame_filters || raw_arg  || result == PY_BT_NO_FILTERS)
 460      {
 461        list_args_or_locals (all, print_value, frame,
 462                             skip_unavailable);
 463      }
 464 }
 465
 466 /* Print single local or argument.  ARG must be already read in.  For
 467    WHAT and VALUES see list_args_or_locals.
 468
 469    Errors are printed as if they would be the parameter value.  Use
 470    zeroed ARG iff it should not be printed according to VALUES.  If
 471    SKIP_UNAVAILABLE is true, only print ARG if it is available.  */
 472
 473 static void
 474 list_arg_or_local (const struct frame_arg *arg, enum what_to_list what,
 475                    enum print_values values, int skip_unavailable)
 476 {
 477   struct cleanup *old_chain;
 478   struct ui_out *uiout = current_uiout;
 479   struct ui_file *stb;
 480
 481   gdb_assert (!arg->val || !arg->error);
 482   gdb_assert ((values == PRINT_NO_VALUES && arg->val == NULL
 483                && arg->error == NULL)
 484               || values == PRINT_SIMPLE_VALUES
 485               || (values == PRINT_ALL_VALUES
 486                   && (arg->val != NULL || arg->error != NULL)));
 487   gdb_assert (arg->entry_kind == print_entry_values_no
 488               || (arg->entry_kind == print_entry_values_only
 489                   && (arg->val || arg->error)));
 490
 491   if (skip_unavailable && arg->val != NULL
 492       && (value_entirely_unavailable (arg->val)
 493           /* A scalar object that does not have all bits available is
 494              also considered unavailable, because all bits contribute
 495              to its representation.  */
 496           || (val_print_scalar_type_p (value_type (arg->val))
 497               && !value_bytes_available (arg->val,
 498                                          value_embedded_offset (arg->val),
 499                                          TYPE_LENGTH (value_type (arg->val))))))
 500     return;
 501
 502   stb = mem_fileopen ();
 503   old_chain = make_cleanup_ui_file_delete (stb);
 504
 505   if (values != PRINT_NO_VALUES || what == all)
 506     make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
 507
 508   fputs_filtered (SYMBOL_PRINT_NAME (arg->sym), stb);
 509   if (arg->entry_kind == print_entry_values_only)
 510     fputs_filtered ("@entry", stb);
 511   ui_out_field_stream (uiout, "name", stb);
 512
 513   if (what == all && SYMBOL_IS_ARGUMENT (arg->sym))
 514     ui_out_field_int (uiout, "arg", 1);
 515
 516   if (values == PRINT_SIMPLE_VALUES)
 517     {
 518       check_typedef (arg->sym->type);
 519       type_print (arg->sym->type, "", stb, -1);
 520       ui_out_field_stream (uiout, "type", stb);
 521     }
 522
 523   if (arg->val || arg->error)
 524     {
 525       volatile struct gdb_exception except;
 526
 527       if (arg->error)
 528         except.message = arg->error;
 529       else
 530         {
 531           /* TRY_CATCH has two statements, wrap it in a block.  */
 532
 533           TRY_CATCH (except, RETURN_MASK_ERROR)
 534             {
 535               struct value_print_options opts;
 536
 537               get_no_prettyformat_print_options (&opts);
 538               opts.deref_ref = 1;
 539               common_val_print (arg->val, stb, 0, &opts,
 540                                 language_def (SYMBOL_LANGUAGE (arg->sym)));
 541             }
 542         }
 543       if (except.message)
 544         fprintf_filtered (stb, _("<error reading variable: %s>"),
 545                           except.message);
 546       ui_out_field_stream (uiout, "value", stb);
 547     }
 548
 549   do_cleanups (old_chain);
 550 }
 551
 552 /* Print a list of the objects for the frame FI in a certain form,
 553    which is determined by VALUES.  The objects can be locals,
 554    arguments or both, which is determined by WHAT.  If SKIP_UNAVAILABLE
 555    is true, only print the arguments or local variables whose values
 556    are available.  */
 557
 558 static void
 559 list_args_or_locals (enum what_to_list what, enum print_values values,
 560                      struct frame_info *fi, int skip_unavailable)
 561 {
 562   struct block *block;
 563   struct symbol *sym;
 564   struct block_iterator iter;
 565   struct cleanup *cleanup_list;
 566   struct type *type;
 567   char *name_of_result;
 568   struct ui_out *uiout = current_uiout;
 569
 570   block = get_frame_block (fi, 0);
 571
 572   switch (what)
 573     {
 574     case locals:
 575       name_of_result = "locals";
 576       break;
 577     case arguments:
 578       name_of_result = "args";
 579       break;
 580     case all:
 581       name_of_result = "variables";
 582       break;
 583     default:
 584       internal_error (__FILE__, __LINE__,
 585                       "unexpected what_to_list: %d", (int) what);
 586     }
 587
 588   cleanup_list = make_cleanup_ui_out_list_begin_end (uiout, name_of_result);
 589
 590   while (block != 0)
 591     {
 592       ALL_BLOCK_SYMBOLS (block, iter, sym)
 593         {
 594           int print_me = 0;
 595
 596           switch (SYMBOL_CLASS (sym))
 597             {
 598             default:
 599             case LOC_UNDEF:     /* catches errors        */
 600             case LOC_CONST:     /* constant              */
 601             case LOC_TYPEDEF:   /* local typedef         */
 602             case LOC_LABEL:     /* local label           */
 603             case LOC_BLOCK:     /* local function        */
 604             case LOC_CONST_BYTES:       /* loc. byte seq.        */
 605             case LOC_UNRESOLVED:        /* unresolved static     */
 606             case LOC_OPTIMIZED_OUT:     /* optimized out         */
 607               print_me = 0;
 608               break;
 609
 610             case LOC_ARG:       /* argument              */
 611             case LOC_REF_ARG:   /* reference arg         */
 612             case LOC_REGPARM_ADDR:      /* indirect register arg */
 613             case LOC_LOCAL:     /* stack local           */
 614             case LOC_STATIC:    /* static                */
 615             case LOC_REGISTER:  /* register              */
 616             case LOC_COMPUTED:  /* computed location     */
 617               if (what == all)
 618                 print_me = 1;
 619               else if (what == locals)
 620                 print_me = !SYMBOL_IS_ARGUMENT (sym);
 621               else
 622                 print_me = SYMBOL_IS_ARGUMENT (sym);
 623               break;
 624             }
 625           if (print_me)
 626             {
 627               struct symbol *sym2;
 628               struct frame_arg arg, entryarg;
 629
 630               if (SYMBOL_IS_ARGUMENT (sym))
 631                 sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
 632                                       block, VAR_DOMAIN,
 633                                       NULL);
 634               else
 635                 sym2 = sym;
 636               gdb_assert (sym2 != NULL);
 637
 638               memset (&arg, 0, sizeof (arg));
 639               arg.sym = sym2;
 640               arg.entry_kind = print_entry_values_no;
 641               memset (&entryarg, 0, sizeof (entryarg));
 642               entryarg.sym = sym2;
 643               entryarg.entry_kind = print_entry_values_no;
 644
 645               switch (values)
 646                 {
 647                 case PRINT_SIMPLE_VALUES:
 648                   type = check_typedef (sym2->type);
 649                   if (TYPE_CODE (type) != TYPE_CODE_ARRAY
 650                       && TYPE_CODE (type) != TYPE_CODE_STRUCT
 651                       && TYPE_CODE (type) != TYPE_CODE_UNION)
 652                     {
 653                 case PRINT_ALL_VALUES:
 654                   if (SYMBOL_IS_ARGUMENT (sym))
 655                     read_frame_arg (sym2, fi, &arg, &entryarg);
 656                   else
 657                     read_frame_local (sym2, fi, &arg);
 658                     }
 659                   break;
 660                 }
 661
 662               if (arg.entry_kind != print_entry_values_only)
 663                 list_arg_or_local (&arg, what, values, skip_unavailable);
 664               if (entryarg.entry_kind != print_entry_values_no)
 665                 list_arg_or_local (&entryarg, what, values, skip_unavailable);
 666               xfree (arg.error);
 667               xfree (entryarg.error);
 668             }
 669         }
 670
 671       if (BLOCK_FUNCTION (block))
 672         break;
 673       else
 674         block = BLOCK_SUPERBLOCK (block);
 675     }
 676   do_cleanups (cleanup_list);
 677 }
 678
 679 void
 680 mi_cmd_stack_select_frame (char *command, char **argv, int argc)
 681 {
 682   if (argc == 0 || argc > 1)
 683     error (_("-stack-select-frame: Usage: FRAME_SPEC"));
 684
 685   select_frame_command (argv[0], 1 /* not used */ );
 686 }
 687
 688 void
 689 mi_cmd_stack_info_frame (char *command, char **argv, int argc)
 690 {
 691   if (argc > 0)
 692     error (_("-stack-info-frame: No arguments allowed"));
 693
 694   print_frame_info (get_selected_frame (NULL), 1, LOC_AND_ADDRESS, 0);
 695 }