gdb/record.c

   1 /* Process record and replay target for GDB, the GNU debugger.
   2
   3    Copyright (C) 2008-2014 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 "observer.h"
  25 #include "inferior.h"
  26 #include "common/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 int
  97 record_read_memory (struct gdbarch *gdbarch,
  98                     CORE_ADDR memaddr, gdb_byte *myaddr,
  99                     ssize_t len)
 100 {
 101   int ret = target_read_memory (memaddr, myaddr, len);
 102
 103   if (ret != 0)
 104     DEBUG ("error reading memory at addr %s len = %ld.\n",
 105            paddress (gdbarch, memaddr), (long) len);
 106
 107   return ret;
 108 }
 109
 110 /* Stop recording.  */
 111
 112 static void
 113 record_stop (struct target_ops *t)
 114 {
 115   DEBUG ("stop %s", t->to_shortname);
 116
 117   t->to_stop_recording (t);
 118 }
 119
 120 /* Unpush the record target.  */
 121
 122 static void
 123 record_unpush (struct target_ops *t)
 124 {
 125   DEBUG ("unpush %s", t->to_shortname);
 126
 127   unpush_target (t);
 128 }
 129
 130 /* See record.h.  */
 131
 132 void
 133 record_disconnect (struct target_ops *t, const char *args, int from_tty)
 134 {
 135   gdb_assert (t->to_stratum == record_stratum);
 136
 137   DEBUG ("disconnect %s", t->to_shortname);
 138
 139   record_stop (t);
 140   record_unpush (t);
 141
 142   target_disconnect (args, from_tty);
 143 }
 144
 145 /* See record.h.  */
 146
 147 void
 148 record_detach (struct target_ops *t, const char *args, int from_tty)
 149 {
 150   gdb_assert (t->to_stratum == record_stratum);
 151
 152   DEBUG ("detach %s", t->to_shortname);
 153
 154   record_stop (t);
 155   record_unpush (t);
 156
 157   target_detach (args, from_tty);
 158 }
 159
 160 /* See record.h.  */
 161
 162 void
 163 record_mourn_inferior (struct target_ops *t)
 164 {
 165   gdb_assert (t->to_stratum == record_stratum);
 166
 167   DEBUG ("mourn inferior %s", t->to_shortname);
 168
 169   /* It is safer to not stop recording.  Resources will be freed when
 170      threads are discarded.  */
 171   record_unpush (t);
 172
 173   target_mourn_inferior ();
 174 }
 175
 176 /* See record.h.  */
 177
 178 void
 179 record_kill (struct target_ops *t)
 180 {
 181   gdb_assert (t->to_stratum == record_stratum);
 182
 183   DEBUG ("kill %s", t->to_shortname);
 184
 185   /* It is safer to not stop recording.  Resources will be freed when
 186      threads are discarded.  */
 187   record_unpush (t);
 188
 189   target_kill ();
 190 }
 191
 192 /* Implement "show record debug" command.  */
 193
 194 static void
 195 show_record_debug (struct ui_file *file, int from_tty,
 196                    struct cmd_list_element *c, const char *value)
 197 {
 198   fprintf_filtered (file, _("Debugging of process record target is %s.\n"),
 199                     value);
 200 }
 201
 202 /* Alias for "target record".  */
 203
 204 static void
 205 cmd_record_start (char *args, int from_tty)
 206 {
 207   execute_command ("target record-full", from_tty);
 208 }
 209
 210 /* Truncate the record log from the present point
 211    of replay until the end.  */
 212
 213 static void
 214 cmd_record_delete (char *args, int from_tty)
 215 {
 216   require_record_target ();
 217
 218   if (!target_record_is_replaying ())
 219     {
 220       printf_unfiltered (_("Already at end of record list.\n"));
 221       return;
 222     }
 223
 224   if (!target_supports_delete_record ())
 225     {
 226       printf_unfiltered (_("The current record target does not support "
 227                            "this operation.\n"));
 228       return;
 229     }
 230
 231   if (!from_tty || query (_("Delete the log from this point forward "
 232                             "and begin to record the running message "
 233                             "at current PC?")))
 234     target_delete_record ();
 235 }
 236
 237 /* Implement the "stoprecord" or "record stop" command.  */
 238
 239 static void
 240 cmd_record_stop (char *args, int from_tty)
 241 {
 242   struct target_ops *t;
 243
 244   t = require_record_target ();
 245
 246   record_stop (t);
 247   record_unpush (t);
 248
 249   printf_unfiltered (_("Process record is stopped and all execution "
 250                        "logs are deleted.\n"));
 251
 252   observer_notify_record_changed (current_inferior (), 0);
 253 }
 254
 255 /* The "set record" command.  */
 256
 257 static void
 258 set_record_command (char *args, int from_tty)
 259 {
 260   printf_unfiltered (_("\"set record\" must be followed "
 261                        "by an apporpriate subcommand.\n"));
 262   help_list (set_record_cmdlist, "set record ", all_commands, gdb_stdout);
 263 }
 264
 265 /* The "show record" command.  */
 266
 267 static void
 268 show_record_command (char *args, int from_tty)
 269 {
 270   cmd_show_list (show_record_cmdlist, from_tty, "");
 271 }
 272
 273 /* The "info record" command.  */
 274
 275 static void
 276 info_record_command (char *args, int from_tty)
 277 {
 278   struct target_ops *t;
 279
 280   t = find_record_target ();
 281   if (t == NULL)
 282     {
 283       printf_filtered (_("No record target is currently active.\n"));
 284       return;
 285     }
 286
 287   printf_filtered (_("Active record target: %s\n"), t->to_shortname);
 288   if (t->to_info_record != NULL)
 289     t->to_info_record (t);
 290 }
 291
 292 /* The "record save" command.  */
 293
 294 static void
 295 cmd_record_save (char *args, int from_tty)
 296 {
 297   char *recfilename, recfilename_buffer[40];
 298
 299   require_record_target ();
 300
 301   if (args != NULL && *args != 0)
 302     recfilename = args;
 303   else
 304     {
 305       /* Default recfile name is "gdb_record.PID".  */
 306       xsnprintf (recfilename_buffer, sizeof (recfilename_buffer),
 307                 "gdb_record.%d", ptid_get_pid (inferior_ptid));
 308       recfilename = recfilename_buffer;
 309     }
 310
 311   target_save_record (recfilename);
 312 }
 313
 314 /* See record.h.  */
 315
 316 void
 317 record_goto (const char *arg)
 318 {
 319   ULONGEST insn;
 320
 321   if (arg == NULL || *arg == '\0')
 322     error (_("Command requires an argument (insn number to go to)."));
 323
 324   insn = parse_and_eval_long (arg);
 325
 326   require_record_target ();
 327   target_goto_record (insn);
 328 }
 329
 330 /* "record goto" command.  Argument is an instruction number,
 331    as given by "info record".
 332
 333    Rewinds the recording (forward or backward) to the given instruction.  */
 334
 335 static void
 336 cmd_record_goto (char *arg, int from_tty)
 337 {
 338   record_goto (arg);
 339 }
 340
 341 /* The "record goto begin" command.  */
 342
 343 static void
 344 cmd_record_goto_begin (char *arg, int from_tty)
 345 {
 346   if (arg != NULL && *arg != '\0')
 347     error (_("Junk after argument: %s."), arg);
 348
 349   require_record_target ();
 350   target_goto_record_begin ();
 351 }
 352
 353 /* The "record goto end" command.  */
 354
 355 static void
 356 cmd_record_goto_end (char *arg, int from_tty)
 357 {
 358   if (arg != NULL && *arg != '\0')
 359     error (_("Junk after argument: %s."), arg);
 360
 361   require_record_target ();
 362   target_goto_record_end ();
 363 }
 364
 365 /* Read an instruction number from an argument string.  */
 366
 367 static ULONGEST
 368 get_insn_number (char **arg)
 369 {
 370   ULONGEST number;
 371   const char *begin, *end, *pos;
 372
 373   begin = *arg;
 374   pos = skip_spaces_const (begin);
 375
 376   if (!isdigit (*pos))
 377     error (_("Expected positive number, got: %s."), pos);
 378
 379   number = strtoulst (pos, &end, 10);
 380
 381   *arg += (end - begin);
 382
 383   return number;
 384 }
 385
 386 /* Read a context size from an argument string.  */
 387
 388 static int
 389 get_context_size (char **arg)
 390 {
 391   char *pos;
 392   int number;
 393
 394   pos = skip_spaces (*arg);
 395
 396   if (!isdigit (*pos))
 397     error (_("Expected positive number, got: %s."), pos);
 398
 399   return strtol (pos, arg, 10);
 400 }
 401
 402 /* Complain about junk at the end of an argument string.  */
 403
 404 static void
 405 no_chunk (char *arg)
 406 {
 407   if (*arg != 0)
 408     error (_("Junk after argument: %s."), arg);
 409 }
 410
 411 /* Read instruction-history modifiers from an argument string.  */
 412
 413 static int
 414 get_insn_history_modifiers (char **arg)
 415 {
 416   int modifiers;
 417   char *args;
 418
 419   modifiers = 0;
 420   args = *arg;
 421
 422   if (args == NULL)
 423     return modifiers;
 424
 425   while (*args == '/')
 426     {
 427       ++args;
 428
 429       if (*args == '\0')
 430         error (_("Missing modifier."));
 431
 432       for (; *args; ++args)
 433         {
 434           if (isspace (*args))
 435             break;
 436
 437           if (*args == '/')
 438             continue;
 439
 440           switch (*args)
 441             {
 442             case 'm':
 443               modifiers |= DISASSEMBLY_SOURCE;
 444               modifiers |= DISASSEMBLY_FILENAME;
 445               break;
 446             case 'r':
 447               modifiers |= DISASSEMBLY_RAW_INSN;
 448               break;
 449             case 'f':
 450               modifiers |= DISASSEMBLY_OMIT_FNAME;
 451               break;
 452             case 'p':
 453               modifiers |= DISASSEMBLY_OMIT_PC;
 454               break;
 455             default:
 456               error (_("Invalid modifier: %c."), *args);
 457             }
 458         }
 459
 460       args = skip_spaces (args);
 461     }
 462
 463   /* Update the argument string.  */
 464   *arg = args;
 465
 466   return modifiers;
 467 }
 468
 469 /* The "set record instruction-history-size / set record
 470    function-call-history-size" commands are unsigned, with UINT_MAX
 471    meaning unlimited.  The target interfaces works with signed int
 472    though, to indicate direction, so map "unlimited" to INT_MAX, which
 473    is about the same as unlimited in practice.  If the user does have
 474    a log that huge, she can fetch it in chunks across several requests,
 475    but she'll likely have other problems first...  */
 476
 477 static int
 478 command_size_to_target_size (unsigned int size)
 479 {
 480   gdb_assert (size <= INT_MAX || size == UINT_MAX);
 481
 482   if (size == UINT_MAX)
 483     return INT_MAX;
 484   else
 485     return size;
 486 }
 487
 488 /* The "record instruction-history" command.  */
 489
 490 static void
 491 cmd_record_insn_history (char *arg, int from_tty)
 492 {
 493   int flags, size;
 494
 495   require_record_target ();
 496
 497   flags = get_insn_history_modifiers (&arg);
 498
 499   size = command_size_to_target_size (record_insn_history_size);
 500
 501   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 502     target_insn_history (size, flags);
 503   else if (strcmp (arg, "-") == 0)
 504     target_insn_history (-size, flags);
 505   else
 506     {
 507       ULONGEST begin, end;
 508
 509       begin = get_insn_number (&arg);
 510
 511       if (*arg == ',')
 512         {
 513           arg = skip_spaces (++arg);
 514
 515           if (*arg == '+')
 516             {
 517               arg += 1;
 518               size = get_context_size (&arg);
 519
 520               no_chunk (arg);
 521
 522               target_insn_history_from (begin, size, flags);
 523             }
 524           else if (*arg == '-')
 525             {
 526               arg += 1;
 527               size = get_context_size (&arg);
 528
 529               no_chunk (arg);
 530
 531               target_insn_history_from (begin, -size, flags);
 532             }
 533           else
 534             {
 535               end = get_insn_number (&arg);
 536
 537               no_chunk (arg);
 538
 539               target_insn_history_range (begin, end, flags);
 540             }
 541         }
 542       else
 543         {
 544           no_chunk (arg);
 545
 546           target_insn_history_from (begin, size, flags);
 547         }
 548
 549       dont_repeat ();
 550     }
 551 }
 552
 553 /* Read function-call-history modifiers from an argument string.  */
 554
 555 static int
 556 get_call_history_modifiers (char **arg)
 557 {
 558   int modifiers;
 559   char *args;
 560
 561   modifiers = 0;
 562   args = *arg;
 563
 564   if (args == NULL)
 565     return modifiers;
 566
 567   while (*args == '/')
 568     {
 569       ++args;
 570
 571       if (*args == '\0')
 572         error (_("Missing modifier."));
 573
 574       for (; *args; ++args)
 575         {
 576           if (isspace (*args))
 577             break;
 578
 579           if (*args == '/')
 580             continue;
 581
 582           switch (*args)
 583             {
 584             case 'l':
 585               modifiers |= RECORD_PRINT_SRC_LINE;
 586               break;
 587             case 'i':
 588               modifiers |= RECORD_PRINT_INSN_RANGE;
 589               break;
 590             case 'c':
 591               modifiers |= RECORD_PRINT_INDENT_CALLS;
 592               break;
 593             default:
 594               error (_("Invalid modifier: %c."), *args);
 595             }
 596         }
 597
 598       args = skip_spaces (args);
 599     }
 600
 601   /* Update the argument string.  */
 602   *arg = args;
 603
 604   return modifiers;
 605 }
 606
 607 /* The "record function-call-history" command.  */
 608
 609 static void
 610 cmd_record_call_history (char *arg, int from_tty)
 611 {
 612   int flags, size;
 613
 614   require_record_target ();
 615
 616   flags = get_call_history_modifiers (&arg);
 617
 618   size = command_size_to_target_size (record_call_history_size);
 619
 620   if (arg == NULL || *arg == 0 || strcmp (arg, "+") == 0)
 621     target_call_history (size, flags);
 622   else if (strcmp (arg, "-") == 0)
 623     target_call_history (-size, flags);
 624   else
 625     {
 626       ULONGEST begin, end;
 627
 628       begin = get_insn_number (&arg);
 629
 630       if (*arg == ',')
 631         {
 632           arg = skip_spaces (++arg);
 633
 634           if (*arg == '+')
 635             {
 636               arg += 1;
 637               size = get_context_size (&arg);
 638
 639               no_chunk (arg);
 640
 641               target_call_history_from (begin, size, flags);
 642             }
 643           else if (*arg == '-')
 644             {
 645               arg += 1;
 646               size = get_context_size (&arg);
 647
 648               no_chunk (arg);
 649
 650               target_call_history_from (begin, -size, flags);
 651             }
 652           else
 653             {
 654               end = get_insn_number (&arg);
 655
 656               no_chunk (arg);
 657
 658               target_call_history_range (begin, end, flags);
 659             }
 660         }
 661       else
 662         {
 663           no_chunk (arg);
 664
 665           target_call_history_from (begin, size, flags);
 666         }
 667
 668       dont_repeat ();
 669     }
 670 }
 671
 672 /* Helper for "set record instruction-history-size" and "set record
 673    function-call-history-size" input validation.  COMMAND_VAR is the
 674    variable registered in the command as control variable.  *SETTING
 675    is the real setting the command allows changing.  */
 676
 677 static void
 678 validate_history_size (unsigned int *command_var, unsigned int *setting)
 679 {
 680   if (*command_var != UINT_MAX && *command_var > INT_MAX)
 681     {
 682       unsigned int new_value = *command_var;
 683
 684       /* Restore previous value.  */
 685       *command_var = *setting;
 686       error (_("integer %u out of range"), new_value);
 687     }
 688
 689   /* Commit new value.  */
 690   *setting = *command_var;
 691 }
 692
 693 /* Called by do_setshow_command.  We only want values in the
 694    [0..INT_MAX] range, while the command's machinery accepts
 695    [0..UINT_MAX].  See command_size_to_target_size.  */
 696
 697 static void
 698 set_record_insn_history_size (char *args, int from_tty,
 699                               struct cmd_list_element *c)
 700 {
 701   validate_history_size (&record_insn_history_size_setshow_var,
 702                          &record_insn_history_size);
 703 }
 704
 705 /* Called by do_setshow_command.  We only want values in the
 706    [0..INT_MAX] range, while the command's machinery accepts
 707    [0..UINT_MAX].  See command_size_to_target_size.  */
 708
 709 static void
 710 set_record_call_history_size (char *args, int from_tty,
 711                               struct cmd_list_element *c)
 712 {
 713   validate_history_size (&record_call_history_size_setshow_var,
 714                          &record_call_history_size);
 715 }
 716
 717 /* Provide a prototype to silence -Wmissing-prototypes.  */
 718 extern initialize_file_ftype _initialize_record;
 719
 720 void
 721 _initialize_record (void)
 722 {
 723   struct cmd_list_element *c;
 724
 725   add_setshow_zuinteger_cmd ("record", no_class, &record_debug,
 726                              _("Set debugging of record/replay feature."),
 727                              _("Show debugging of record/replay feature."),
 728                              _("When enabled, debugging output for "
 729                                "record/replay feature is displayed."),
 730                              NULL, show_record_debug, &setdebuglist,
 731                              &showdebuglist);
 732
 733   add_setshow_uinteger_cmd ("instruction-history-size", no_class,
 734                             &record_insn_history_size_setshow_var, _("\
 735 Set number of instructions to print in \"record instruction-history\"."), _("\
 736 Show number of instructions to print in \"record instruction-history\"."), _("\
 737 A size of \"unlimited\" means unlimited instructions.  The default is 10."),
 738                             set_record_insn_history_size, NULL,
 739                             &set_record_cmdlist, &show_record_cmdlist);
 740
 741   add_setshow_uinteger_cmd ("function-call-history-size", no_class,
 742                             &record_call_history_size_setshow_var, _("\
 743 Set number of function to print in \"record function-call-history\"."), _("\
 744 Show number of functions to print in \"record function-call-history\"."), _("\
 745 A size of \"unlimited\" means unlimited lines.  The default is 10."),
 746                             set_record_call_history_size, NULL,
 747                             &set_record_cmdlist, &show_record_cmdlist);
 748
 749   c = add_prefix_cmd ("record", class_obscure, cmd_record_start,
 750                       _("Start recording."),
 751                       &record_cmdlist, "record ", 0, &cmdlist);
 752   set_cmd_completer (c, filename_completer);
 753
 754   add_com_alias ("rec", "record", class_obscure, 1);
 755   add_prefix_cmd ("record", class_support, set_record_command,
 756                   _("Set record options"), &set_record_cmdlist,
 757                   "set record ", 0, &setlist);
 758   add_alias_cmd ("rec", "record", class_obscure, 1, &setlist);
 759   add_prefix_cmd ("record", class_support, show_record_command,
 760                   _("Show record options"), &show_record_cmdlist,
 761                   "show record ", 0, &showlist);
 762   add_alias_cmd ("rec", "record", class_obscure, 1, &showlist);
 763   add_prefix_cmd ("record", class_support, info_record_command,
 764                   _("Info record options"), &info_record_cmdlist,
 765                   "info record ", 0, &infolist);
 766   add_alias_cmd ("rec", "record", class_obscure, 1, &infolist);
 767
 768   c = add_cmd ("save", class_obscure, cmd_record_save,
 769                _("Save the execution log to a file.\n\
 770 Argument is optional filename.\n\
 771 Default filename is 'gdb_record.<process_id>'."),
 772                &record_cmdlist);
 773   set_cmd_completer (c, filename_completer);
 774
 775   add_cmd ("delete", class_obscure, cmd_record_delete,
 776            _("Delete the rest of execution log and start recording it anew."),
 777            &record_cmdlist);
 778   add_alias_cmd ("d", "delete", class_obscure, 1, &record_cmdlist);
 779   add_alias_cmd ("del", "delete", class_obscure, 1, &record_cmdlist);
 780
 781   add_cmd ("stop", class_obscure, cmd_record_stop,
 782            _("Stop the record/replay target."),
 783            &record_cmdlist);
 784   add_alias_cmd ("s", "stop", class_obscure, 1, &record_cmdlist);
 785
 786   add_prefix_cmd ("goto", class_obscure, cmd_record_goto, _("\
 787 Restore the program to its state at instruction number N.\n\
 788 Argument is instruction number, as shown by 'info record'."),
 789                   &record_goto_cmdlist, "record goto ", 1, &record_cmdlist);
 790
 791   add_cmd ("begin", class_obscure, cmd_record_goto_begin,
 792            _("Go to the beginning of the execution log."),
 793            &record_goto_cmdlist);
 794   add_alias_cmd ("start", "begin", class_obscure, 1, &record_goto_cmdlist);
 795
 796   add_cmd ("end", class_obscure, cmd_record_goto_end,
 797            _("Go to the end of the execution log."),
 798            &record_goto_cmdlist);
 799
 800   add_cmd ("instruction-history", class_obscure, cmd_record_insn_history, _("\
 801 Print disassembled instructions stored in the execution log.\n\
 802 With a /m modifier, source lines are included (if available).\n\
 803 With a /r modifier, raw instructions in hex are included.\n\
 804 With a /f modifier, function names are omitted.\n\
 805 With a /p modifier, current position markers are omitted.\n\
 806 With no argument, disassembles ten more instructions after the previous \
 807 disassembly.\n\
 808 \"record instruction-history -\" disassembles ten instructions before a \
 809 previous disassembly.\n\
 810 One argument specifies an instruction number as shown by 'info record', and \
 811 ten instructions are disassembled after that instruction.\n\
 812 Two arguments with comma between them specify starting and ending instruction \
 813 numbers to disassemble.\n\
 814 If the second argument is preceded by '+' or '-', it specifies the distance \
 815 from the first argument.\n\
 816 The number of instructions to disassemble can be defined with \"set record \
 817 instruction-history-size\"."),
 818            &record_cmdlist);
 819
 820   add_cmd ("function-call-history", class_obscure, cmd_record_call_history, _("\
 821 Prints the execution history at function granularity.\n\
 822 It prints one line for each sequence of instructions that belong to the same \
 823 function.\n\
 824 Without modifiers, it prints the function name.\n\
 825 With a /l modifier, the source file and line number range is included.\n\
 826 With a /i modifier, the instruction number range is included.\n\
 827 With a /c modifier, the output is indented based on the call stack depth.\n\
 828 With no argument, prints ten more lines after the previous ten-line print.\n\
 829 \"record function-call-history -\" prints ten lines before a previous ten-line \
 830 print.\n\
 831 One argument specifies a function number as shown by 'info record', and \
 832 ten lines are printed after that function.\n\
 833 Two arguments with comma between them specify a range of functions to print.\n\
 834 If the second argument is preceded by '+' or '-', it specifies the distance \
 835 from the first argument.\n\
 836 The number of functions to print can be defined with \"set record \
 837 function-call-history-size\"."),
 838            &record_cmdlist);
 839
 840   /* Sync command control variables.  */
 841   record_insn_history_size_setshow_var = record_insn_history_size;
 842   record_call_history_size_setshow_var = record_call_history_size;
 843 }