gdb/record.c

   1 /* Process record and replay target for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2023 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 #include "interps.h"
  30
  31 #include <ctype.h>
  32
  33 /* This is the debug switch for process record.  */
  34 unsigned int record_debug = 0;
  35
  36 /* The number of instructions to print in "record instruction-history".  */
  37 static unsigned int record_insn_history_size = 10;
  38
  39 /* The variable registered as control variable in the "record
  40    instruction-history" command.  Necessary for extra input
  41    validation.  */
  42 static unsigned int record_insn_history_size_setshow_var;
  43
  44 /* The number of functions to print in "record function-call-history".  */
  45 static unsigned int record_call_history_size = 10;
  46
  47 /* The variable registered as control variable in the "record
  48    call-history" command.  Necessary for extra input validation.  */
  49 static unsigned int record_call_history_size_setshow_var;
  50
  51 struct cmd_list_element *record_cmdlist = NULL;
  52 static struct cmd_list_element *record_goto_cmdlist = NULL;
  53 struct cmd_list_element *set_record_cmdlist = NULL;
  54 struct cmd_list_element *show_record_cmdlist = NULL;
  55 struct cmd_list_element *info_record_cmdlist = NULL;
  56
  57 #define DEBUG(msg, args...)                                             \
  58   if (record_debug)                                                     \
  59     gdb_printf (gdb_stdlog, "record: " msg "\n", ##args)
  60
  61 /* See record.h.  */
  62
  63 struct target_ops *
  64 find_record_target (void)
  65 {
  66   return find_target_at (record_stratum);
  67 }
  68
  69 /* Check that recording is active.  Throw an error, if it isn't.  */
  70
  71 static struct target_ops *
  72 require_record_target (void)
  73 {
  74   struct target_ops *t;
  75
  76   t = find_record_target ();
  77   if (t == NULL)
  78     error (_("No recording is currently active.\n"
  79              "Use the \"record full\" or \"record btrace\" command first."));
  80
  81   return t;
  82 }
  83
  84 /* See record.h.  */
  85
  86 void
  87 record_preopen (void)
  88 {
  89   /* Check if a record target is already running.  */
  90   if (find_record_target () != NULL)
  91     error (_("The process is already being recorded.  Use \"record stop\" to "
  92              "stop recording first."));
  93 }
  94
  95 /* See record.h.  */
  96
  97 void
  98 record_start (const char *method, const char *format, int from_tty)
  99 {
 100   if (method == NULL)
 101     {
 102       if (format == NULL)
 103         execute_command_to_string ("record", from_tty, false);
 104       else
 105         error (_("Invalid format."));
 106     }
 107   else if (strcmp (method, "full") == 0)
 108     {
 109       if (format == NULL)
 110         execute_command_to_string ("record full", from_tty, false);
 111       else
 112         error (_("Invalid format."));
 113     }
 114   else if (strcmp (method, "btrace") == 0)
 115     {
 116       if (format == NULL)
 117         execute_command_to_string ("record btrace", from_tty, false);
 118       else if (strcmp (format, "bts") == 0)
 119         execute_command_to_string ("record btrace bts", from_tty, false);
 120       else if (strcmp (format, "pt") == 0)
 121         execute_command_to_string ("record btrace pt", from_tty, false);
 122       else
 123         error (_("Invalid format."));
 124     }
 125   else
 126     error (_("Invalid method."));
 127 }
 128
 129 /* See record.h.  */
 130
 131 void
 132 record_stop (int from_tty)
 133 {
 134   execute_command_to_string ("record stop", from_tty, false);
 135 }
 136
 137 /* See record.h.  */
 138
 139 int
 140 record_read_memory (struct gdbarch *gdbarch,
 141                     CORE_ADDR memaddr, gdb_byte *myaddr,
 142                     ssize_t len)
 143 {
 144   int ret = target_read_memory (memaddr, myaddr, len);
 145
 146   if (ret != 0)
 147     DEBUG ("error reading memory at addr %s len = %ld.\n",
 148            paddress (gdbarch, memaddr), (long) len);
 149
 150   return ret;
 151 }
 152
 153 /* Stop recording.  */
 154
 155 static void
 156 record_stop (struct target_ops *t)
 157 {
 158   DEBUG ("stop %s", t->shortname ());
 159
 160   t->stop_recording ();
 161 }
 162
 163 /* Unpush the record target.  */
 164
 165 static void
 166 record_unpush (struct target_ops *t)
 167 {
 168   DEBUG ("unpush %s", t->shortname ());
 169
 170   current_inferior ()->unpush_target (t);
 171 }
 172
 173 /* See record.h.  */
 174
 175 void
 176 record_disconnect (struct target_ops *t, const char *args, int from_tty)
 177 {
 178   gdb_assert (t->stratum () == record_stratum);
 179
 180   DEBUG ("disconnect %s", t->shortname ());
 181
 182   record_stop (t);
 183   record_unpush (t);
 184
 185   target_disconnect (args, from_tty);
 186 }
 187
 188 /* See record.h.  */
 189
 190 void
 191 record_detach (struct target_ops *t, inferior *inf, int from_tty)
 192 {
 193   gdb_assert (t->stratum () == record_stratum);
 194
 195   DEBUG ("detach %s", t->shortname ());
 196
 197   record_stop (t);
 198   record_unpush (t);
 199
 200   target_detach (inf, from_tty);
 201 }
 202
 203 /* See record.h.  */
 204
 205 void
 206 record_mourn_inferior (struct target_ops *t)
 207 {
 208   gdb_assert (t->stratum () == record_stratum);
 209
 210   DEBUG ("mourn inferior %s", t->shortname ());
 211
 212   /* It is safer to not stop recording.  Resources will be freed when
 213      threads are discarded.  */
 214   record_unpush (t);
 215
 216   target_mourn_inferior (inferior_ptid);
 217 }
 218
 219 /* See record.h.  */
 220
 221 void
 222 record_kill (struct target_ops *t)
 223 {
 224   gdb_assert (t->stratum () == record_stratum);
 225
 226   DEBUG ("kill %s", t->shortname ());
 227
 228   /* It is safer to not stop recording.  Resources will be freed when
 229      threads are discarded.  */
 230   record_unpush (t);
 231
 232   target_kill ();
 233 }
 234
 235 /* See record.h.  */
 236
 237 int
 238 record_check_stopped_by_breakpoint (const address_space *aspace,
 239                                     CORE_ADDR pc,
 240                                     enum target_stop_reason *reason)
 241 {
 242   if (breakpoint_inserted_here_p (aspace, pc))
 243     {
 244       if (hardware_breakpoint_inserted_here_p (aspace, pc))
 245         *reason = TARGET_STOPPED_BY_HW_BREAKPOINT;
 246       else
 247         *reason = TARGET_STOPPED_BY_SW_BREAKPOINT;
 248       return 1;
 249     }
 250
 251   *reason = TARGET_STOPPED_BY_NO_REASON;
 252   return 0;
 253 }
 254
 255 /* Implement "show record debug" command.  */
 256
 257 static void
 258 show_record_debug (struct ui_file *file, int from_tty,
 259                    struct cmd_list_element *c, const char *value)
 260 {
 261   gdb_printf (file, _("Debugging of process record target is %s.\n"),
 262               value);
 263 }
 264
 265 /* Alias for "target record".  */
 266
 267 static void
 268 cmd_record_start (const char *args, int from_tty)
 269 {
 270   execute_command ("target record-full", from_tty);
 271 }
 272
 273 /* Truncate the record log from the present point
 274    of replay until the end.  */
 275
 276 static void
 277 cmd_record_delete (const char *args, int from_tty)
 278 {
 279   require_record_target ();
 280
 281   if (!target_record_is_replaying (inferior_ptid))
 282     {
 283       gdb_printf (_("Already at end of record list.\n"));
 284       return;
 285     }
 286
 287   if (!target_supports_delete_record ())
 288     {
 289       gdb_printf (_("The current record target does not support "
 290                     "this operation.\n"));
 291       return;
 292     }
 293
 294   if (!from_tty || query (_("Delete the log from this point forward "
 295                             "and begin to record the running message "
 296                             "at current PC?")))
 297     target_delete_record ();
 298 }
 299
 300 /* Implement the "stoprecord" or "record stop" command.  */
 301
 302 static void
 303 cmd_record_stop (const char *args, int from_tty)
 304 {
 305   struct target_ops *t;
 306
 307   t = require_record_target ();
 308
 309   record_stop (t);
 310   record_unpush (t);
 311
 312   gdb_printf (_("Process record is stopped and all execution "
 313                 "logs are deleted.\n"));
 314
 315   interps_notify_record_changed (current_inferior (), 0, NULL, NULL);
 316 }
 317
 318
 319 /* The "info record" command.  */
 320
 321 static void
 322 info_record_command (const char *args, int from_tty)
 323 {
 324   struct target_ops *t;
 325
 326   t = find_record_target ();
 327   if (t == NULL)
 328     {
 329       gdb_printf (_("No recording is currently active.\n"));
 330       return;
 331     }
 332
 333   gdb_printf (_("Active record target: %s\n"), t->shortname ());
 334   t->info_record ();
 335 }
 336
 337 /* The "record save" command.  */
 338
 339 static void
 340 cmd_record_save (const char *args, int from_tty)
 341 {
 342   const char *recfilename;
 343   char recfilename_buffer[40];
 344
 345   require_record_target ();
 346
 347   if (args != NULL && *args != 0)
 348     recfilename = args;
 349   else
 350     {
 351       /* Default recfile name is "gdb_record.PID".  */
 352       xsnprintf (recfilename_buffer, sizeof (recfilename_buffer),
 353                 "gdb_record.%d", inferior_ptid.pid ());
 354       recfilename = recfilename_buffer;
 355     }
 356
 357   target_save_record (recfilename);
 358 }
 359
 360 /* See record.h.  */
 361
 362 void
 363 record_goto (const char *arg)
 364 {
 365   ULONGEST insn;
 366
 367   if (arg == NULL || *arg == '\0')
 368     error (_("Command requires an argument (insn number to go to)."));
 369
 370   insn = parse_and_eval_long (arg);
 371
 372   require_record_target ();
 373   target_goto_record (insn);
 374 }
 375
 376 /* "record goto" command.  Argument is an instruction number,
 377    as given by "info record".
 378
 379    Rewinds the recording (forward or backward) to the given instruction.  */
 380
 381 static void
 382 cmd_record_goto (const char *arg, int from_tty)
 383 {
 384   record_goto (arg);
 385 }
 386
 387 /* The "record goto begin" command.  */
 388
 389 static void
 390 cmd_record_goto_begin (const char *arg, int from_tty)
 391 {
 392   if (arg != NULL && *arg != '\0')
 393     error (_("Junk after argument: %s."), arg);
 394
 395   require_record_target ();
 396   target_goto_record_begin ();
 397 }
 398
 399 /* The "record goto end" command.  */
 400
 401 static void
 402 cmd_record_goto_end (const char *arg, int from_tty)
 403 {
 404   if (arg != NULL && *arg != '\0')
 405     error (_("Junk after argument: %s."), arg);
 406
 407   require_record_target ();
 408   target_goto_record_end ();
 409 }
 410
 411 /* Read an instruction number from an argument string.  */
 412
 413 static ULONGEST
 414 get_insn_number (const char **arg)
 415 {
 416   ULONGEST number;
 417   const char *begin, *end, *pos;
 418
 419   begin = *arg;
 420   pos = skip_spaces (begin);
 421
 422   if (!isdigit (*pos))
 423     error (_("Expected positive number, got: %s."), pos);
 424
 425   number = strtoulst (pos, &end, 10);
 426
 427   *arg += (end - begin);
 428
 429   return number;
 430 }
 431
 432 /* Read a context size from an argument string.  */
 433
 434 static int
 435 get_context_size (const char **arg)
 436 {
 437   const char *pos;
 438   char *end;
 439
 440   pos = skip_spaces (*arg);
 441
 442   if (!isdigit (*pos))
 443     error (_("Expected positive number, got: %s."), pos);
 444
 445   long result = strtol (pos, &end, 10);
 446   *arg = end;
 447   return result;
 448 }
 449
 450 /* Complain about junk at the end of an argument string.  */
 451
 452 static void
 453 no_chunk (const char *arg)
 454 {
 455   if (*arg != 0)
 456     error (_("Junk after argument: %s."), arg);
 457 }
 458
 459 /* Read instruction-history modifiers from an argument string.  */
 460
 461 static gdb_disassembly_flags
 462 get_insn_history_modifiers (const char **arg)
 463 {
 464   gdb_disassembly_flags modifiers;
 465   const char *args;
 466
 467   modifiers = 0;
 468   args = *arg;
 469
 470   if (args == NULL)
 471     return modifiers;
 472
 473   while (*args == '/')
 474     {
 475       ++args;
 476
 477       if (*args == '\0')
 478         error (_("Missing modifier."));
 479
 480       for (; *args; ++args)
 481         {
 482           if (isspace (*args))
 483             break;
 484
 485           if (*args == '/')
 486             continue;
 487
 488           switch (*args)
 489             {
 490             case 'm':
 491             case 's':
 492               modifiers |= DISASSEMBLY_SOURCE;
 493               modifiers |= DISASSEMBLY_FILENAME;
 494               break;
 495             case 'r':
 496               modifiers |= DISASSEMBLY_RAW_INSN;
 497               break;
 498             case 'b':
 499               modifiers |= DISASSEMBLY_RAW_BYTES;
 500               break;
 501             case 'f':
 502               modifiers |= DISASSEMBLY_OMIT_FNAME;
 503               break;
 504             case 'p':
 505               modifiers |= DISASSEMBLY_OMIT_PC;
 506               break;
 507             default:
 508               error (_("Invalid modifier: %c."), *args);
 509             }
 510         }
 511
 512       args = skip_spaces (args);
 513     }
 514
 515   /* Update the argument string.  */
 516   *arg = args;
 517
 518   return modifiers;
 519 }
 520
 521 /* The "set record instruction-history-size / set record
 522    function-call-history-size" commands are unsigned, with UINT_MAX
 523    meaning unlimited.  The target interfaces works with signed int
 524    though, to indicate direction, so map "unlimited" to INT_MAX, which
 525    is about the same as unlimited in practice.  If the user does have
 526    a log that huge, she can fetch it in chunks across several requests,
 527    but she'll likely have other problems first...  */
 528
 529 static int
 530 command_size_to_target_size (unsigned int size)
 531 {
 532   gdb_assert (size <= INT_MAX || size == UINT_MAX);
 533
 534   if (size == UINT_MAX)
 535     return INT_MAX;
 536   else
 537     return size;
 538 }
 539
 540 /* The "record instruction-history" command.  */
 541
 542 static void
 543 cmd_record_insn_history (const char *arg, int from_tty)
 544 {
 545   require_record_target ();
 546
 547   gdb_disassembly_flags flags = get_insn_history_modifiers (&arg);
 548
 549   int size = command_size_to_target_size (record_insn_history_size);
 550
 551   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 552     target_insn_history (size, flags);
 553   else if (strcmp (arg, "-") == 0)
 554     target_insn_history (-size, flags);
 555   else
 556     {
 557       ULONGEST begin, end;
 558
 559       begin = get_insn_number (&arg);
 560
 561       if (*arg == ',')
 562         {
 563           arg = skip_spaces (++arg);
 564
 565           if (*arg == '+')
 566             {
 567               arg += 1;
 568               size = get_context_size (&arg);
 569
 570               no_chunk (arg);
 571
 572               target_insn_history_from (begin, size, flags);
 573             }
 574           else if (*arg == '-')
 575             {
 576               arg += 1;
 577               size = get_context_size (&arg);
 578
 579               no_chunk (arg);
 580
 581               target_insn_history_from (begin, -size, flags);
 582             }
 583           else
 584             {
 585               end = get_insn_number (&arg);
 586
 587               no_chunk (arg);
 588
 589               target_insn_history_range (begin, end, flags);
 590             }
 591         }
 592       else
 593         {
 594           no_chunk (arg);
 595
 596           target_insn_history_from (begin, size, flags);
 597         }
 598
 599       dont_repeat ();
 600     }
 601 }
 602
 603 /* Read function-call-history modifiers from an argument string.  */
 604
 605 static record_print_flags
 606 get_call_history_modifiers (const char **arg)
 607 {
 608   record_print_flags modifiers = 0;
 609   const char *args = *arg;
 610
 611   if (args == NULL)
 612     return modifiers;
 613
 614   while (*args == '/')
 615     {
 616       ++args;
 617
 618       if (*args == '\0')
 619         error (_("Missing modifier."));
 620
 621       for (; *args; ++args)
 622         {
 623           if (isspace (*args))
 624             break;
 625
 626           if (*args == '/')
 627             continue;
 628
 629           switch (*args)
 630             {
 631             case 'l':
 632               modifiers |= RECORD_PRINT_SRC_LINE;
 633               break;
 634             case 'i':
 635               modifiers |= RECORD_PRINT_INSN_RANGE;
 636               break;
 637             case 'c':
 638               modifiers |= RECORD_PRINT_INDENT_CALLS;
 639               break;
 640             default:
 641               error (_("Invalid modifier: %c."), *args);
 642             }
 643         }
 644
 645       args = skip_spaces (args);
 646     }
 647
 648   /* Update the argument string.  */
 649   *arg = args;
 650
 651   return modifiers;
 652 }
 653
 654 /* The "record function-call-history" command.  */
 655
 656 static void
 657 cmd_record_call_history (const char *arg, int from_tty)
 658 {
 659   require_record_target ();
 660
 661   record_print_flags flags = get_call_history_modifiers (&arg);
 662
 663   int size = command_size_to_target_size (record_call_history_size);
 664
 665   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 666     target_call_history (size, flags);
 667   else if (strcmp (arg, "-") == 0)
 668     target_call_history (-size, flags);
 669   else
 670     {
 671       ULONGEST begin, end;
 672
 673       begin = get_insn_number (&arg);
 674
 675       if (*arg == ',')
 676         {
 677           arg = skip_spaces (++arg);
 678
 679           if (*arg == '+')
 680             {
 681               arg += 1;
 682               size = get_context_size (&arg);
 683
 684               no_chunk (arg);
 685
 686               target_call_history_from (begin, size, flags);
 687             }
 688           else if (*arg == '-')
 689             {
 690               arg += 1;
 691               size = get_context_size (&arg);
 692
 693               no_chunk (arg);
 694
 695               target_call_history_from (begin, -size, flags);
 696             }
 697           else
 698             {
 699               end = get_insn_number (&arg);
 700
 701               no_chunk (arg);
 702
 703               target_call_history_range (begin, end, flags);
 704             }
 705         }
 706       else
 707         {
 708           no_chunk (arg);
 709
 710           target_call_history_from (begin, size, flags);
 711         }
 712
 713       dont_repeat ();
 714     }
 715 }
 716
 717 /* Helper for "set record instruction-history-size" and "set record
 718    function-call-history-size" input validation.  COMMAND_VAR is the
 719    variable registered in the command as control variable.  *SETTING
 720    is the real setting the command allows changing.  */
 721
 722 static void
 723 validate_history_size (unsigned int *command_var, unsigned int *setting)
 724 {
 725   if (*command_var != UINT_MAX && *command_var > INT_MAX)
 726     {
 727       unsigned int new_value = *command_var;
 728
 729       /* Restore previous value.  */
 730       *command_var = *setting;
 731       error (_("integer %u out of range"), new_value);
 732     }
 733
 734   /* Commit new value.  */
 735   *setting = *command_var;
 736 }
 737
 738 /* Called by do_setshow_command.  We only want values in the
 739    [0..INT_MAX] range, while the command's machinery accepts
 740    [0..UINT_MAX].  See command_size_to_target_size.  */
 741
 742 static void
 743 set_record_insn_history_size (const char *args, int from_tty,
 744                               struct cmd_list_element *c)
 745 {
 746   validate_history_size (&record_insn_history_size_setshow_var,
 747                          &record_insn_history_size);
 748 }
 749
 750 /* Called by do_setshow_command.  We only want values in the
 751    [0..INT_MAX] range, while the command's machinery accepts
 752    [0..UINT_MAX].  See command_size_to_target_size.  */
 753
 754 static void
 755 set_record_call_history_size (const char *args, int from_tty,
 756                               struct cmd_list_element *c)
 757 {
 758   validate_history_size (&record_call_history_size_setshow_var,
 759                          &record_call_history_size);
 760 }
 761
 762 void _initialize_record ();
 763 void
 764 _initialize_record ()
 765 {
 766   struct cmd_list_element *c;
 767
 768   add_setshow_zuinteger_cmd ("record", no_class, &record_debug,
 769                              _("Set debugging of record/replay feature."),
 770                              _("Show debugging of record/replay feature."),
 771                              _("When enabled, debugging output for "
 772                                "record/replay feature is displayed."),
 773                              NULL, show_record_debug, &setdebuglist,
 774                              &showdebuglist);
 775
 776   add_setshow_uinteger_cmd ("instruction-history-size", no_class,
 777                             &record_insn_history_size_setshow_var, _("\
 778 Set number of instructions to print in \"record instruction-history\"."), _("\
 779 Show number of instructions to print in \"record instruction-history\"."), _("\
 780 A size of \"unlimited\" means unlimited instructions.  The default is 10."),
 781                             set_record_insn_history_size, NULL,
 782                             &set_record_cmdlist, &show_record_cmdlist);
 783
 784   add_setshow_uinteger_cmd ("function-call-history-size", no_class,
 785                             &record_call_history_size_setshow_var, _("\
 786 Set number of function to print in \"record function-call-history\"."), _("\
 787 Show number of functions to print in \"record function-call-history\"."), _("\
 788 A size of \"unlimited\" means unlimited lines.  The default is 10."),
 789                             set_record_call_history_size, NULL,
 790                             &set_record_cmdlist, &show_record_cmdlist);
 791
 792   cmd_list_element *record_cmd
 793     = add_prefix_cmd ("record", class_obscure, cmd_record_start,
 794                       _("Start recording."),
 795                       &record_cmdlist, 0, &cmdlist);
 796   set_cmd_completer (record_cmd, filename_completer);
 797
 798   add_com_alias ("rec", record_cmd, class_obscure, 1);
 799
 800   set_show_commands setshow_record_cmds
 801     = add_setshow_prefix_cmd ("record", class_support,
 802                               _("Set record options."),
 803                               _("Show record options."),
 804                               &set_record_cmdlist, &show_record_cmdlist,
 805                               &setlist, &showlist);
 806
 807
 808   add_alias_cmd ("rec", setshow_record_cmds.set, class_obscure, 1, &setlist);
 809   add_alias_cmd ("rec", setshow_record_cmds.show, class_obscure, 1, &showlist);
 810
 811   cmd_list_element *info_record_cmd
 812     = add_prefix_cmd ("record", class_support, info_record_command,
 813                       _("Info record options."), &info_record_cmdlist,
 814                       0, &infolist);
 815   add_alias_cmd ("rec", info_record_cmd, class_obscure, 1, &infolist);
 816
 817   c = add_cmd ("save", class_obscure, cmd_record_save,
 818                _("Save the execution log to a file.\n\
 819 Usage: record save [FILENAME]\n\
 820 Default filename is 'gdb_record.PROCESS_ID'."),
 821                &record_cmdlist);
 822   set_cmd_completer (c, filename_completer);
 823
 824   cmd_list_element *record_delete_cmd
 825     =  add_cmd ("delete", class_obscure, cmd_record_delete,
 826                 _("Delete the rest of execution log and start recording it \
 827 anew."),
 828             &record_cmdlist);
 829   add_alias_cmd ("d", record_delete_cmd, class_obscure, 1, &record_cmdlist);
 830   add_alias_cmd ("del", record_delete_cmd, class_obscure, 1, &record_cmdlist);
 831
 832   cmd_list_element *record_stop_cmd
 833     = add_cmd ("stop", class_obscure, cmd_record_stop,
 834                _("Stop the record/replay target."),
 835                &record_cmdlist);
 836   add_alias_cmd ("s", record_stop_cmd, class_obscure, 1, &record_cmdlist);
 837
 838   add_prefix_cmd ("goto", class_obscure, cmd_record_goto, _("\
 839 Restore the program to its state at instruction number N.\n\
 840 Argument is instruction number, as shown by 'info record'."),
 841                   &record_goto_cmdlist, 1, &record_cmdlist);
 842
 843   cmd_list_element *record_goto_begin_cmd
 844     = add_cmd ("begin", class_obscure, cmd_record_goto_begin,
 845                _("Go to the beginning of the execution log."),
 846                &record_goto_cmdlist);
 847   add_alias_cmd ("start", record_goto_begin_cmd, class_obscure, 1,
 848                  &record_goto_cmdlist);
 849
 850   add_cmd ("end", class_obscure, cmd_record_goto_end,
 851            _("Go to the end of the execution log."),
 852            &record_goto_cmdlist);
 853
 854   add_cmd ("instruction-history", class_obscure, cmd_record_insn_history, _("\
 855 Print disassembled instructions stored in the execution log.\n\
 856 With a /m or /s modifier, source lines are included (if available).\n\
 857 With a /r modifier, raw instructions in hex are included.\n\
 858 With a /f modifier, function names are omitted.\n\
 859 With a /p modifier, current position markers are omitted.\n\
 860 With no argument, disassembles ten more instructions after the previous \
 861 disassembly.\n\
 862 \"record instruction-history -\" disassembles ten instructions before a \
 863 previous disassembly.\n\
 864 One argument specifies an instruction number as shown by 'info record', and \
 865 ten instructions are disassembled after that instruction.\n\
 866 Two arguments with comma between them specify starting and ending instruction \
 867 numbers to disassemble.\n\
 868 If the second argument is preceded by '+' or '-', it specifies the distance \
 869 from the first argument.\n\
 870 The number of instructions to disassemble can be defined with \"set record \
 871 instruction-history-size\"."),
 872            &record_cmdlist);
 873
 874   add_cmd ("function-call-history", class_obscure, cmd_record_call_history, _("\
 875 Prints the execution history at function granularity.\n\
 876 It prints one line for each sequence of instructions that belong to the same \
 877 function.\n\
 878 Without modifiers, it prints the function name.\n\
 879 With a /l modifier, the source file and line number range is included.\n\
 880 With a /i modifier, the instruction number range is included.\n\
 881 With a /c modifier, the output is indented based on the call stack depth.\n\
 882 With no argument, prints ten more lines after the previous ten-line print.\n\
 883 \"record function-call-history -\" prints ten lines before a previous ten-line \
 884 print.\n\
 885 One argument specifies a function number as shown by 'info record', and \
 886 ten lines are printed after that function.\n\
 887 Two arguments with comma between them specify a range of functions to print.\n\
 888 If the second argument is preceded by '+' or '-', it specifies the distance \
 889 from the first argument.\n\
 890 The number of functions to print can be defined with \"set record \
 891 function-call-history-size\"."),
 892            &record_cmdlist);
 893
 894   /* Sync command control variables.  */
 895   record_insn_history_size_setshow_var = record_insn_history_size;
 896   record_call_history_size_setshow_var = record_call_history_size;
 897 }