gdb/record.c

   1 /* Process record and replay target for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2020 Free Software Foundation, Inc.
   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 "gdbcmd.h"
  22 #include "completer.h"
  23 #include "record.h"
  24 #include "observable.h"
  25 #include "inferior.h"
  26 #include "gdbsupport/common-utils.h"
  27 #include "cli/cli-utils.h"
  28 #include "disasm.h"
  29
  30 #include <ctype.h>
  31
  32 /* This is the debug switch for process record.  */
  33 unsigned int record_debug = 0;
  34
  35 /* The number of instructions to print in "record instruction-history".  */
  36 static unsigned int record_insn_history_size = 10;
  37
  38 /* The variable registered as control variable in the "record
  39    instruction-history" command.  Necessary for extra input
  40    validation.  */
  41 static unsigned int record_insn_history_size_setshow_var;
  42
  43 /* The number of functions to print in "record function-call-history".  */
  44 static unsigned int record_call_history_size = 10;
  45
  46 /* The variable registered as control variable in the "record
  47    call-history" command.  Necessary for extra input validation.  */
  48 static unsigned int record_call_history_size_setshow_var;
  49
  50 struct cmd_list_element *record_cmdlist = NULL;
  51 struct cmd_list_element *record_goto_cmdlist = NULL;
  52 struct cmd_list_element *set_record_cmdlist = NULL;
  53 struct cmd_list_element *show_record_cmdlist = NULL;
  54 struct cmd_list_element *info_record_cmdlist = NULL;
  55
  56 #define DEBUG(msg, args...)                                             \
  57   if (record_debug)                                                     \
  58     fprintf_unfiltered (gdb_stdlog, "record: " msg "\n", ##args)
  59
  60 /* See record.h.  */
  61
  62 struct target_ops *
  63 find_record_target (void)
  64 {
  65   return find_target_at (record_stratum);
  66 }
  67
  68 /* Check that recording is active.  Throw an error, if it isn't.  */
  69
  70 static struct target_ops *
  71 require_record_target (void)
  72 {
  73   struct target_ops *t;
  74
  75   t = find_record_target ();
  76   if (t == NULL)
  77     error (_("No record target is currently active.\n"
  78              "Use one of the \"target record-<TAB><TAB>\" commands first."));
  79
  80   return t;
  81 }
  82
  83 /* See record.h.  */
  84
  85 void
  86 record_preopen (void)
  87 {
  88   /* Check if a record target is already running.  */
  89   if (find_record_target () != NULL)
  90     error (_("The process is already being recorded.  Use \"record stop\" to "
  91              "stop recording first."));
  92 }
  93
  94 /* See record.h.  */
  95
  96 void
  97 record_start (const char *method, const char *format, int from_tty)
  98 {
  99   if (method == NULL)
 100     {
 101       if (format == NULL)
 102         execute_command_to_string ("record", from_tty, false);
 103       else
 104         error (_("Invalid format."));
 105     }
 106   else if (strcmp (method, "full") == 0)
 107     {
 108       if (format == NULL)
 109         execute_command_to_string ("record full", from_tty, false);
 110       else
 111         error (_("Invalid format."));
 112     }
 113   else if (strcmp (method, "btrace") == 0)
 114     {
 115       if (format == NULL)
 116         execute_command_to_string ("record btrace", from_tty, false);
 117       else if (strcmp (format, "bts") == 0)
 118         execute_command_to_string ("record btrace bts", from_tty, false);
 119       else if (strcmp (format, "pt") == 0)
 120         execute_command_to_string ("record btrace pt", from_tty, false);
 121       else
 122         error (_("Invalid format."));
 123     }
 124   else
 125     error (_("Invalid method."));
 126 }
 127
 128 /* See record.h.  */
 129
 130 void
 131 record_stop (int from_tty)
 132 {
 133   execute_command_to_string ("record stop", from_tty, false);
 134 }
 135
 136 /* See record.h.  */
 137
 138 int
 139 record_read_memory (struct gdbarch *gdbarch,
 140                     CORE_ADDR memaddr, gdb_byte *myaddr,
 141                     ssize_t len)
 142 {
 143   int ret = target_read_memory (memaddr, myaddr, len);
 144
 145   if (ret != 0)
 146     DEBUG ("error reading memory at addr %s len = %ld.\n",
 147            paddress (gdbarch, memaddr), (long) len);
 148
 149   return ret;
 150 }
 151
 152 /* Stop recording.  */
 153
 154 static void
 155 record_stop (struct target_ops *t)
 156 {
 157   DEBUG ("stop %s", t->shortname ());
 158
 159   t->stop_recording ();
 160 }
 161
 162 /* Unpush the record target.  */
 163
 164 static void
 165 record_unpush (struct target_ops *t)
 166 {
 167   DEBUG ("unpush %s", t->shortname ());
 168
 169   unpush_target (t);
 170 }
 171
 172 /* See record.h.  */
 173
 174 void
 175 record_disconnect (struct target_ops *t, const char *args, int from_tty)
 176 {
 177   gdb_assert (t->stratum () == record_stratum);
 178
 179   DEBUG ("disconnect %s", t->shortname ());
 180
 181   record_stop (t);
 182   record_unpush (t);
 183
 184   target_disconnect (args, from_tty);
 185 }
 186
 187 /* See record.h.  */
 188
 189 void
 190 record_detach (struct target_ops *t, inferior *inf, int from_tty)
 191 {
 192   gdb_assert (t->stratum () == record_stratum);
 193
 194   DEBUG ("detach %s", t->shortname ());
 195
 196   record_stop (t);
 197   record_unpush (t);
 198
 199   target_detach (inf, from_tty);
 200 }
 201
 202 /* See record.h.  */
 203
 204 void
 205 record_mourn_inferior (struct target_ops *t)
 206 {
 207   gdb_assert (t->stratum () == record_stratum);
 208
 209   DEBUG ("mourn inferior %s", t->shortname ());
 210
 211   /* It is safer to not stop recording.  Resources will be freed when
 212      threads are discarded.  */
 213   record_unpush (t);
 214
 215   target_mourn_inferior (inferior_ptid);
 216 }
 217
 218 /* See record.h.  */
 219
 220 void
 221 record_kill (struct target_ops *t)
 222 {
 223   gdb_assert (t->stratum () == record_stratum);
 224
 225   DEBUG ("kill %s", t->shortname ());
 226
 227   /* It is safer to not stop recording.  Resources will be freed when
 228      threads are discarded.  */
 229   record_unpush (t);
 230
 231   target_kill ();
 232 }
 233
 234 /* See record.h.  */
 235
 236 int
 237 record_check_stopped_by_breakpoint (const address_space *aspace,
 238                                     CORE_ADDR pc,
 239                                     enum target_stop_reason *reason)
 240 {
 241   if (breakpoint_inserted_here_p (aspace, pc))
 242     {
 243       if (hardware_breakpoint_inserted_here_p (aspace, pc))
 244         *reason = TARGET_STOPPED_BY_HW_BREAKPOINT;
 245       else
 246         *reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
 247       return 1;
 248     }
 249
 250   *reason = TARGET_STOPPED_BY_NO_REASON;
 251   return 0;
 252 }
 253
 254 /* Implement "show record debug" command.  */
 255
 256 static void
 257 show_record_debug (struct ui_file *file, int from_tty,
 258                    struct cmd_list_element *c, const char *value)
 259 {
 260   fprintf_filtered (file, _("Debugging of process record target is %s.\n"),
 261                     value);
 262 }
 263
 264 /* Alias for "target record".  */
 265
 266 static void
 267 cmd_record_start (const char *args, int from_tty)
 268 {
 269   execute_command ("target record-full", from_tty);
 270 }
 271
 272 /* Truncate the record log from the present point
 273    of replay until the end.  */
 274
 275 static void
 276 cmd_record_delete (const char *args, int from_tty)
 277 {
 278   require_record_target ();
 279
 280   if (!target_record_is_replaying (inferior_ptid))
 281     {
 282       printf_unfiltered (_("Already at end of record list.\n"));
 283       return;
 284     }
 285
 286   if (!target_supports_delete_record ())
 287     {
 288       printf_unfiltered (_("The current record target does not support "
 289                            "this operation.\n"));
 290       return;
 291     }
 292
 293   if (!from_tty || query (_("Delete the log from this point forward "
 294                             "and begin to record the running message "
 295                             "at current PC?")))
 296     target_delete_record ();
 297 }
 298
 299 /* Implement the "stoprecord" or "record stop" command.  */
 300
 301 static void
 302 cmd_record_stop (const char *args, int from_tty)
 303 {
 304   struct target_ops *t;
 305
 306   t = require_record_target ();
 307
 308   record_stop (t);
 309   record_unpush (t);
 310
 311   printf_unfiltered (_("Process record is stopped and all execution "
 312                        "logs are deleted.\n"));
 313
 314   gdb::observers::record_changed.notify (current_inferior (), 0, NULL, NULL);
 315 }
 316
 317
 318 /* The "info record" command.  */
 319
 320 static void
 321 info_record_command (const char *args, int from_tty)
 322 {
 323   struct target_ops *t;
 324
 325   t = find_record_target ();
 326   if (t == NULL)
 327     {
 328       printf_filtered (_("No record target is currently active.\n"));
 329       return;
 330     }
 331
 332   printf_filtered (_("Active record target: %s\n"), t->shortname ());
 333   t->info_record ();
 334 }
 335
 336 /* The "record save" command.  */
 337
 338 static void
 339 cmd_record_save (const char *args, int from_tty)
 340 {
 341   const char *recfilename;
 342   char recfilename_buffer[40];
 343
 344   require_record_target ();
 345
 346   if (args != NULL && *args != 0)
 347     recfilename = args;
 348   else
 349     {
 350       /* Default recfile name is "gdb_record.PID".  */
 351       xsnprintf (recfilename_buffer, sizeof (recfilename_buffer),
 352                 "gdb_record.%d", inferior_ptid.pid ());
 353       recfilename = recfilename_buffer;
 354     }
 355
 356   target_save_record (recfilename);
 357 }
 358
 359 /* See record.h.  */
 360
 361 void
 362 record_goto (const char *arg)
 363 {
 364   ULONGEST insn;
 365
 366   if (arg == NULL || *arg == '\0')
 367     error (_("Command requires an argument (insn number to go to)."));
 368
 369   insn = parse_and_eval_long (arg);
 370
 371   require_record_target ();
 372   target_goto_record (insn);
 373 }
 374
 375 /* "record goto" command.  Argument is an instruction number,
 376    as given by "info record".
 377
 378    Rewinds the recording (forward or backward) to the given instruction.  */
 379
 380 static void
 381 cmd_record_goto (const char *arg, int from_tty)
 382 {
 383   record_goto (arg);
 384 }
 385
 386 /* The "record goto begin" command.  */
 387
 388 static void
 389 cmd_record_goto_begin (const char *arg, int from_tty)
 390 {
 391   if (arg != NULL && *arg != '\0')
 392     error (_("Junk after argument: %s."), arg);
 393
 394   require_record_target ();
 395   target_goto_record_begin ();
 396 }
 397
 398 /* The "record goto end" command.  */
 399
 400 static void
 401 cmd_record_goto_end (const char *arg, int from_tty)
 402 {
 403   if (arg != NULL && *arg != '\0')
 404     error (_("Junk after argument: %s."), arg);
 405
 406   require_record_target ();
 407   target_goto_record_end ();
 408 }
 409
 410 /* Read an instruction number from an argument string.  */
 411
 412 static ULONGEST
 413 get_insn_number (const char **arg)
 414 {
 415   ULONGEST number;
 416   const char *begin, *end, *pos;
 417
 418   begin = *arg;
 419   pos = skip_spaces (begin);
 420
 421   if (!isdigit (*pos))
 422     error (_("Expected positive number, got: %s."), pos);
 423
 424   number = strtoulst (pos, &end, 10);
 425
 426   *arg += (end - begin);
 427
 428   return number;
 429 }
 430
 431 /* Read a context size from an argument string.  */
 432
 433 static int
 434 get_context_size (const char **arg)
 435 {
 436   const char *pos;
 437   char *end;
 438
 439   pos = skip_spaces (*arg);
 440
 441   if (!isdigit (*pos))
 442     error (_("Expected positive number, got: %s."), pos);
 443
 444   long result = strtol (pos, &end, 10);
 445   *arg = end;
 446   return result;
 447 }
 448
 449 /* Complain about junk at the end of an argument string.  */
 450
 451 static void
 452 no_chunk (const char *arg)
 453 {
 454   if (*arg != 0)
 455     error (_("Junk after argument: %s."), arg);
 456 }
 457
 458 /* Read instruction-history modifiers from an argument string.  */
 459
 460 static gdb_disassembly_flags
 461 get_insn_history_modifiers (const char **arg)
 462 {
 463   gdb_disassembly_flags modifiers;
 464   const char *args;
 465
 466   modifiers = 0;
 467   args = *arg;
 468
 469   if (args == NULL)
 470     return modifiers;
 471
 472   while (*args == '/')
 473     {
 474       ++args;
 475
 476       if (*args == '\0')
 477         error (_("Missing modifier."));
 478
 479       for (; *args; ++args)
 480         {
 481           if (isspace (*args))
 482             break;
 483
 484           if (*args == '/')
 485             continue;
 486
 487           switch (*args)
 488             {
 489             case 'm':
 490             case 's':
 491               modifiers |= DISASSEMBLY_SOURCE;
 492               modifiers |= DISASSEMBLY_FILENAME;
 493               break;
 494             case 'r':
 495               modifiers |= DISASSEMBLY_RAW_INSN;
 496               break;
 497             case 'f':
 498               modifiers |= DISASSEMBLY_OMIT_FNAME;
 499               break;
 500             case 'p':
 501               modifiers |= DISASSEMBLY_OMIT_PC;
 502               break;
 503             default:
 504               error (_("Invalid modifier: %c."), *args);
 505             }
 506         }
 507
 508       args = skip_spaces (args);
 509     }
 510
 511   /* Update the argument string.  */
 512   *arg = args;
 513
 514   return modifiers;
 515 }
 516
 517 /* The "set record instruction-history-size / set record
 518    function-call-history-size" commands are unsigned, with UINT_MAX
 519    meaning unlimited.  The target interfaces works with signed int
 520    though, to indicate direction, so map "unlimited" to INT_MAX, which
 521    is about the same as unlimited in practice.  If the user does have
 522    a log that huge, she can fetch it in chunks across several requests,
 523    but she'll likely have other problems first...  */
 524
 525 static int
 526 command_size_to_target_size (unsigned int size)
 527 {
 528   gdb_assert (size <= INT_MAX || size == UINT_MAX);
 529
 530   if (size == UINT_MAX)
 531     return INT_MAX;
 532   else
 533     return size;
 534 }
 535
 536 /* The "record instruction-history" command.  */
 537
 538 static void
 539 cmd_record_insn_history (const char *arg, int from_tty)
 540 {
 541   require_record_target ();
 542
 543   gdb_disassembly_flags flags = get_insn_history_modifiers (&arg);
 544
 545   int size = command_size_to_target_size (record_insn_history_size);
 546
 547   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 548     target_insn_history (size, flags);
 549   else if (strcmp (arg, "-") == 0)
 550     target_insn_history (-size, flags);
 551   else
 552     {
 553       ULONGEST begin, end;
 554
 555       begin = get_insn_number (&arg);
 556
 557       if (*arg == ',')
 558         {
 559           arg = skip_spaces (++arg);
 560
 561           if (*arg == '+')
 562             {
 563               arg += 1;
 564               size = get_context_size (&arg);
 565
 566               no_chunk (arg);
 567
 568               target_insn_history_from (begin, size, flags);
 569             }
 570           else if (*arg == '-')
 571             {
 572               arg += 1;
 573               size = get_context_size (&arg);
 574
 575               no_chunk (arg);
 576
 577               target_insn_history_from (begin, -size, flags);
 578             }
 579           else
 580             {
 581               end = get_insn_number (&arg);
 582
 583               no_chunk (arg);
 584
 585               target_insn_history_range (begin, end, flags);
 586             }
 587         }
 588       else
 589         {
 590           no_chunk (arg);
 591
 592           target_insn_history_from (begin, size, flags);
 593         }
 594
 595       dont_repeat ();
 596     }
 597 }
 598
 599 /* Read function-call-history modifiers from an argument string.  */
 600
 601 static record_print_flags
 602 get_call_history_modifiers (const char **arg)
 603 {
 604   record_print_flags modifiers = 0;
 605   const char *args = *arg;
 606
 607   if (args == NULL)
 608     return modifiers;
 609
 610   while (*args == '/')
 611     {
 612       ++args;
 613
 614       if (*args == '\0')
 615         error (_("Missing modifier."));
 616
 617       for (; *args; ++args)
 618         {
 619           if (isspace (*args))
 620             break;
 621
 622           if (*args == '/')
 623             continue;
 624
 625           switch (*args)
 626             {
 627             case 'l':
 628               modifiers |= RECORD_PRINT_SRC_LINE;
 629               break;
 630             case 'i':
 631               modifiers |= RECORD_PRINT_INSN_RANGE;
 632               break;
 633             case 'c':
 634               modifiers |= RECORD_PRINT_INDENT_CALLS;
 635               break;
 636             default:
 637               error (_("Invalid modifier: %c."), *args);
 638             }
 639         }
 640
 641       args = skip_spaces (args);
 642     }
 643
 644   /* Update the argument string.  */
 645   *arg = args;
 646
 647   return modifiers;
 648 }
 649
 650 /* The "record function-call-history" command.  */
 651
 652 static void
 653 cmd_record_call_history (const char *arg, int from_tty)
 654 {
 655   require_record_target ();
 656
 657   record_print_flags flags = get_call_history_modifiers (&arg);
 658
 659   int size = command_size_to_target_size (record_call_history_size);
 660
 661   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 662     target_call_history (size, flags);
 663   else if (strcmp (arg, "-") == 0)
 664     target_call_history (-size, flags);
 665   else
 666     {
 667       ULONGEST begin, end;
 668
 669       begin = get_insn_number (&arg);
 670
 671       if (*arg == ',')
 672         {
 673           arg = skip_spaces (++arg);
 674
 675           if (*arg == '+')
 676             {
 677               arg += 1;
 678               size = get_context_size (&arg);
 679
 680               no_chunk (arg);
 681
 682               target_call_history_from (begin, size, flags);
 683             }
 684           else if (*arg == '-')
 685             {
 686               arg += 1;
 687               size = get_context_size (&arg);
 688
 689               no_chunk (arg);
 690
 691               target_call_history_from (begin, -size, flags);
 692             }
 693           else
 694             {
 695               end = get_insn_number (&arg);
 696
 697               no_chunk (arg);
 698
 699               target_call_history_range (begin, end, flags);
 700             }
 701         }
 702       else
 703         {
 704           no_chunk (arg);
 705
 706           target_call_history_from (begin, size, flags);
 707         }
 708
 709       dont_repeat ();
 710     }
 711 }
 712
 713 /* Helper for "set record instruction-history-size" and "set record
 714    function-call-history-size" input validation.  COMMAND_VAR is the
 715    variable registered in the command as control variable.  *SETTING
 716    is the real setting the command allows changing.  */
 717
 718 static void
 719 validate_history_size (unsigned int *command_var, unsigned int *setting)
 720 {
 721   if (*command_var != UINT_MAX && *command_var > INT_MAX)
 722     {
 723       unsigned int new_value = *command_var;
 724
 725       /* Restore previous value.  */
 726       *command_var = *setting;
 727       error (_("integer %u out of range"), new_value);
 728     }
 729
 730   /* Commit new value.  */
 731   *setting = *command_var;
 732 }
 733
 734 /* Called by do_setshow_command.  We only want values in the
 735    [0..INT_MAX] range, while the command's machinery accepts
 736    [0..UINT_MAX].  See command_size_to_target_size.  */
 737
 738 static void
 739 set_record_insn_history_size (const char *args, int from_tty,
 740                               struct cmd_list_element *c)
 741 {
 742   validate_history_size (&record_insn_history_size_setshow_var,
 743                          &record_insn_history_size);
 744 }
 745
 746 /* Called by do_setshow_command.  We only want values in the
 747    [0..INT_MAX] range, while the command's machinery accepts
 748    [0..UINT_MAX].  See command_size_to_target_size.  */
 749
 750 static void
 751 set_record_call_history_size (const char *args, int from_tty,
 752                               struct cmd_list_element *c)
 753 {
 754   validate_history_size (&record_call_history_size_setshow_var,
 755                          &record_call_history_size);
 756 }
 757
 758 void _initialize_record ();
 759 void
 760 _initialize_record ()
 761 {
 762   struct cmd_list_element *c;
 763
 764   add_setshow_zuinteger_cmd ("record", no_class, &record_debug,
 765                              _("Set debugging of record/replay feature."),
 766                              _("Show debugging of record/replay feature."),
 767                              _("When enabled, debugging output for "
 768                                "record/replay feature is displayed."),
 769                              NULL, show_record_debug, &setdebuglist,
 770                              &showdebuglist);
 771
 772   add_setshow_uinteger_cmd ("instruction-history-size", no_class,
 773                             &record_insn_history_size_setshow_var, _("\
 774 Set number of instructions to print in \"record instruction-history\"."), _("\
 775 Show number of instructions to print in \"record instruction-history\"."), _("\
 776 A size of \"unlimited\" means unlimited instructions.  The default is 10."),
 777                             set_record_insn_history_size, NULL,
 778                             &set_record_cmdlist, &show_record_cmdlist);
 779
 780   add_setshow_uinteger_cmd ("function-call-history-size", no_class,
 781                             &record_call_history_size_setshow_var, _("\
 782 Set number of function to print in \"record function-call-history\"."), _("\
 783 Show number of functions to print in \"record function-call-history\"."), _("\
 784 A size of \"unlimited\" means unlimited lines.  The default is 10."),
 785                             set_record_call_history_size, NULL,
 786                             &set_record_cmdlist, &show_record_cmdlist);
 787
 788   c = add_prefix_cmd ("record", class_obscure, cmd_record_start,
 789                       _("Start recording."),
 790                       &record_cmdlist, "record ", 0, &cmdlist);
 791   set_cmd_completer (c, filename_completer);
 792
 793   add_com_alias ("rec", "record", class_obscure, 1);
 794   add_basic_prefix_cmd ("record", class_support,
 795                         _("Set record options."), &set_record_cmdlist,
 796                         "set record ", 0, &setlist);
 797   add_alias_cmd ("rec", "record", class_obscure, 1, &setlist);
 798   add_show_prefix_cmd ("record", class_support,
 799                        _("Show record options."), &show_record_cmdlist,
 800                        "show record ", 0, &showlist);
 801   add_alias_cmd ("rec", "record", class_obscure, 1, &showlist);
 802   add_prefix_cmd ("record", class_support, info_record_command,
 803                   _("Info record options."), &info_record_cmdlist,
 804                   "info record ", 0, &infolist);
 805   add_alias_cmd ("rec", "record", class_obscure, 1, &infolist);
 806
 807   c = add_cmd ("save", class_obscure, cmd_record_save,
 808                _("Save the execution log to a file.\n\
 809 Usage: record save [FILENAME]\n\
 810 Default filename is 'gdb_record.PROCESS_ID'."),
 811                &record_cmdlist);
 812   set_cmd_completer (c, filename_completer);
 813
 814   add_cmd ("delete", class_obscure, cmd_record_delete,
 815            _("Delete the rest of execution log and start recording it anew."),
 816            &record_cmdlist);
 817   add_alias_cmd ("d", "delete", class_obscure, 1, &record_cmdlist);
 818   add_alias_cmd ("del", "delete", class_obscure, 1, &record_cmdlist);
 819
 820   add_cmd ("stop", class_obscure, cmd_record_stop,
 821            _("Stop the record/replay target."),
 822            &record_cmdlist);
 823   add_alias_cmd ("s", "stop", class_obscure, 1, &record_cmdlist);
 824
 825   add_prefix_cmd ("goto", class_obscure, cmd_record_goto, _("\
 826 Restore the program to its state at instruction number N.\n\
 827 Argument is instruction number, as shown by 'info record'."),
 828                   &record_goto_cmdlist, "record goto ", 1, &record_cmdlist);
 829
 830   add_cmd ("begin", class_obscure, cmd_record_goto_begin,
 831            _("Go to the beginning of the execution log."),
 832            &record_goto_cmdlist);
 833   add_alias_cmd ("start", "begin", class_obscure, 1, &record_goto_cmdlist);
 834
 835   add_cmd ("end", class_obscure, cmd_record_goto_end,
 836            _("Go to the end of the execution log."),
 837            &record_goto_cmdlist);
 838
 839   add_cmd ("instruction-history", class_obscure, cmd_record_insn_history, _("\
 840 Print disassembled instructions stored in the execution log.\n\
 841 With a /m or /s modifier, source lines are included (if available).\n\
 842 With a /r modifier, raw instructions in hex are included.\n\
 843 With a /f modifier, function names are omitted.\n\
 844 With a /p modifier, current position markers are omitted.\n\
 845 With no argument, disassembles ten more instructions after the previous \
 846 disassembly.\n\
 847 \"record instruction-history -\" disassembles ten instructions before a \
 848 previous disassembly.\n\
 849 One argument specifies an instruction number as shown by 'info record', and \
 850 ten instructions are disassembled after that instruction.\n\
 851 Two arguments with comma between them specify starting and ending instruction \
 852 numbers to disassemble.\n\
 853 If the second argument is preceded by '+' or '-', it specifies the distance \
 854 from the first argument.\n\
 855 The number of instructions to disassemble can be defined with \"set record \
 856 instruction-history-size\"."),
 857            &record_cmdlist);
 858
 859   add_cmd ("function-call-history", class_obscure, cmd_record_call_history, _("\
 860 Prints the execution history at function granularity.\n\
 861 It prints one line for each sequence of instructions that belong to the same \
 862 function.\n\
 863 Without modifiers, it prints the function name.\n\
 864 With a /l modifier, the source file and line number range is included.\n\
 865 With a /i modifier, the instruction number range is included.\n\
 866 With a /c modifier, the output is indented based on the call stack depth.\n\
 867 With no argument, prints ten more lines after the previous ten-line print.\n\
 868 \"record function-call-history -\" prints ten lines before a previous ten-line \
 869 print.\n\
 870 One argument specifies a function number as shown by 'info record', and \
 871 ten lines are printed after that function.\n\
 872 Two arguments with comma between them specify a range of functions to print.\n\
 873 If the second argument is preceded by '+' or '-', it specifies the distance \
 874 from the first argument.\n\
 875 The number of functions to print can be defined with \"set record \
 876 function-call-history-size\"."),
 877            &record_cmdlist);
 878
 879   /* Sync command control variables.  */
 880   record_insn_history_size_setshow_var = record_insn_history_size;
 881   record_call_history_size_setshow_var = record_call_history_size;
 882 }