gdb/skip.c

   1 /* Skipping uninteresting files and functions while stepping.
   2
   3    Copyright (C) 2011-2021 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "defs.h"
  19 #include "skip.h"
  20 #include "value.h"
  21 #include "valprint.h"
  22 #include "ui-out.h"
  23 #include "symtab.h"
  24 #include "gdbcmd.h"
  25 #include "command.h"
  26 #include "completer.h"
  27 #include "stack.h"
  28 #include "cli/cli-utils.h"
  29 #include "arch-utils.h"
  30 #include "linespec.h"
  31 #include "objfiles.h"
  32 #include "breakpoint.h" /* for get_sal_arch () */
  33 #include "source.h"
  34 #include "filenames.h"
  35 #include "fnmatch.h"
  36 #include "gdb_regex.h"
  37 #include "gdbsupport/gdb_optional.h"
  38 #include <list>
  39 #include "cli/cli-style.h"
  40
  41 /* True if we want to print debug printouts related to file/function
  42    skipping. */
  43 static bool debug_skip = false;
  44
  45 class skiplist_entry
  46 {
  47 public:
  48   /* Create a skiplist_entry object and add it to the chain.  */
  49   static void add_entry (bool file_is_glob,
  50                          std::string &&file,
  51                          bool function_is_regexp,
  52                          std::string &&function);
  53
  54   /* Return true if the skip entry has a file or glob-style file
  55      pattern that matches FUNCTION_SAL.  */
  56   bool skip_file_p (const symtab_and_line &function_sal) const;
  57
  58   /* Return true if the skip entry has a function or function regexp
  59      that matches FUNCTION_NAME.  */
  60   bool skip_function_p (const char *function_name) const;
  61
  62   /* Getters.  */
  63   int number () const { return m_number; };
  64   bool enabled () const { return m_enabled; };
  65   bool file_is_glob () const { return m_file_is_glob; }
  66   const std::string &file () const { return m_file; }
  67   const std::string &function () const { return m_function; }
  68   bool function_is_regexp () const { return m_function_is_regexp; }
  69
  70   /* Setters.  */
  71   void enable () { m_enabled = true; };
  72   void disable () { m_enabled = false; };
  73
  74   /* Disable copy.  */
  75   skiplist_entry (const skiplist_entry &) = delete;
  76   void operator= (const skiplist_entry &) = delete;
  77
  78 private:
  79   /* Key that grants access to the constructor.  */
  80   struct private_key {};
  81 public:
  82   /* Public so we can construct with container::emplace_back.  Since
  83      it requires a private class key, it can't be called from outside.
  84      Use the add_entry static factory method to construct instead.  */
  85   skiplist_entry (bool file_is_glob, std::string &&file,
  86                   bool function_is_regexp, std::string &&function,
  87                   private_key);
  88
  89 private:
  90   /* Return true if we're stopped at a file to be skipped.  */
  91   bool do_skip_file_p (const symtab_and_line &function_sal) const;
  92
  93   /* Return true if we're stopped at a globbed file to be skipped.  */
  94   bool do_skip_gfile_p (const symtab_and_line &function_sal) const;
  95
  96 private: /* data */
  97   int m_number = -1;
  98
  99   /* True if FILE is a glob-style pattern.
 100      Otherwise it is the plain file name (possibly with directories).  */
 101   bool m_file_is_glob;
 102
 103   /* The name of the file or empty if no name.  */
 104   std::string m_file;
 105
 106   /* True if FUNCTION is a regexp.
 107      Otherwise it is a plain function name (possibly with arguments,
 108      for C++).  */
 109   bool m_function_is_regexp;
 110
 111   /* The name of the function or empty if no name.  */
 112   std::string m_function;
 113
 114   /* If this is a function regexp, the compiled form.  */
 115   gdb::optional<compiled_regex> m_compiled_function_regexp;
 116
 117   /* Enabled/disabled state.  */
 118   bool m_enabled = true;
 119 };
 120
 121 static std::list<skiplist_entry> skiplist_entries;
 122 static int highest_skiplist_entry_num = 0;
 123
 124 skiplist_entry::skiplist_entry (bool file_is_glob,
 125                                 std::string &&file,
 126                                 bool function_is_regexp,
 127                                 std::string &&function,
 128                                 private_key)
 129   : m_file_is_glob (file_is_glob),
 130     m_file (std::move (file)),
 131     m_function_is_regexp (function_is_regexp),
 132     m_function (std::move (function))
 133 {
 134   gdb_assert (!m_file.empty () || !m_function.empty ());
 135
 136   if (m_file_is_glob)
 137     gdb_assert (!m_file.empty ());
 138
 139   if (m_function_is_regexp)
 140     {
 141       gdb_assert (!m_function.empty ());
 142       m_compiled_function_regexp.emplace (m_function.c_str (),
 143                                           REG_NOSUB | REG_EXTENDED,
 144                                           _("regexp"));
 145     }
 146 }
 147
 148 void
 149 skiplist_entry::add_entry (bool file_is_glob, std::string &&file,
 150                            bool function_is_regexp, std::string &&function)
 151 {
 152   skiplist_entries.emplace_back (file_is_glob,
 153                                  std::move (file),
 154                                  function_is_regexp,
 155                                  std::move (function),
 156                                  private_key {});
 157
 158   /* Incremented after push_back, in case push_back throws.  */
 159   skiplist_entries.back ().m_number = ++highest_skiplist_entry_num;
 160 }
 161
 162 static void
 163 skip_file_command (const char *arg, int from_tty)
 164 {
 165   struct symtab *symtab;
 166   const char *filename = NULL;
 167
 168   /* If no argument was given, try to default to the last
 169      displayed codepoint.  */
 170   if (arg == NULL)
 171     {
 172       symtab = get_last_displayed_symtab ();
 173       if (symtab == NULL)
 174         error (_("No default file now."));
 175
 176       /* It is not a typo, symtab_to_filename_for_display would be needlessly
 177          ambiguous.  */
 178       filename = symtab_to_fullname (symtab);
 179     }
 180   else
 181     filename = arg;
 182
 183   skiplist_entry::add_entry (false, std::string (filename),
 184                              false, std::string ());
 185
 186   printf_filtered (_("File %s will be skipped when stepping.\n"), filename);
 187 }
 188
 189 /* Create a skiplist entry for the given function NAME and add it to the
 190    list.  */
 191
 192 static void
 193 skip_function (const char *name)
 194 {
 195   skiplist_entry::add_entry (false, std::string (), false, std::string (name));
 196
 197   printf_filtered (_("Function %s will be skipped when stepping.\n"), name);
 198 }
 199
 200 static void
 201 skip_function_command (const char *arg, int from_tty)
 202 {
 203   /* Default to the current function if no argument is given.  */
 204   if (arg == NULL)
 205     {
 206       frame_info *fi = get_selected_frame (_("No default function now."));
 207       struct symbol *sym = get_frame_function (fi);
 208       const char *name = NULL;
 209
 210       if (sym != NULL)
 211         name = sym->print_name ();
 212       else
 213         error (_("No function found containing current program point %s."),
 214                paddress (get_current_arch (), get_frame_pc (fi)));
 215       skip_function (name);
 216       return;
 217     }
 218
 219   skip_function (arg);
 220 }
 221
 222 /* Process "skip ..." that does not match "skip file" or "skip function".  */
 223
 224 static void
 225 skip_command (const char *arg, int from_tty)
 226 {
 227   const char *file = NULL;
 228   const char *gfile = NULL;
 229   const char *function = NULL;
 230   const char *rfunction = NULL;
 231   int i;
 232
 233   if (arg == NULL)
 234     {
 235       skip_function_command (arg, from_tty);
 236       return;
 237     }
 238
 239   gdb_argv argv (arg);
 240
 241   for (i = 0; argv[i] != NULL; ++i)
 242     {
 243       const char *p = argv[i];
 244       const char *value = argv[i + 1];
 245
 246       if (strcmp (p, "-fi") == 0
 247           || strcmp (p, "-file") == 0)
 248         {
 249           if (value == NULL)
 250             error (_("Missing value for %s option."), p);
 251           file = value;
 252           ++i;
 253         }
 254       else if (strcmp (p, "-gfi") == 0
 255                || strcmp (p, "-gfile") == 0)
 256         {
 257           if (value == NULL)
 258             error (_("Missing value for %s option."), p);
 259           gfile = value;
 260           ++i;
 261         }
 262       else if (strcmp (p, "-fu") == 0
 263                || strcmp (p, "-function") == 0)
 264         {
 265           if (value == NULL)
 266             error (_("Missing value for %s option."), p);
 267           function = value;
 268           ++i;
 269         }
 270       else if (strcmp (p, "-rfu") == 0
 271                || strcmp (p, "-rfunction") == 0)
 272         {
 273           if (value == NULL)
 274             error (_("Missing value for %s option."), p);
 275           rfunction = value;
 276           ++i;
 277         }
 278       else if (*p == '-')
 279         error (_("Invalid skip option: %s"), p);
 280       else if (i == 0)
 281         {
 282           /* Assume the user entered "skip FUNCTION-NAME".
 283              FUNCTION-NAME may be `foo (int)', and therefore we pass the
 284              complete original arg to skip_function command as if the user
 285              typed "skip function arg".  */
 286           skip_function_command (arg, from_tty);
 287           return;
 288         }
 289       else
 290         error (_("Invalid argument: %s"), p);
 291     }
 292
 293   if (file != NULL && gfile != NULL)
 294     error (_("Cannot specify both -file and -gfile."));
 295
 296   if (function != NULL && rfunction != NULL)
 297     error (_("Cannot specify both -function and -rfunction."));
 298
 299   /* This shouldn't happen as "skip" by itself gets punted to
 300      skip_function_command.  */
 301   gdb_assert (file != NULL || gfile != NULL
 302               || function != NULL || rfunction != NULL);
 303
 304   std::string entry_file;
 305   if (file != NULL)
 306     entry_file = file;
 307   else if (gfile != NULL)
 308     entry_file = gfile;
 309
 310   std::string entry_function;
 311   if (function != NULL)
 312     entry_function = function;
 313   else if (rfunction != NULL)
 314     entry_function = rfunction;
 315
 316   skiplist_entry::add_entry (gfile != NULL, std::move (entry_file),
 317                              rfunction != NULL, std::move (entry_function));
 318
 319   /* I18N concerns drive some of the choices here (we can't piece together
 320      the output too much).  OTOH we want to keep this simple.  Therefore the
 321      only polish we add to the output is to append "(s)" to "File" or
 322      "Function" if they're a glob/regexp.  */
 323   {
 324     const char *file_to_print = file != NULL ? file : gfile;
 325     const char *function_to_print = function != NULL ? function : rfunction;
 326     const char *file_text = gfile != NULL ? _("File(s)") : _("File");
 327     const char *lower_file_text = gfile != NULL ? _("file(s)") : _("file");
 328     const char *function_text
 329       = rfunction != NULL ? _("Function(s)") : _("Function");
 330
 331     if (function_to_print == NULL)
 332       {
 333         printf_filtered (_("%s %s will be skipped when stepping.\n"),
 334                          file_text, file_to_print);
 335       }
 336     else if (file_to_print == NULL)
 337       {
 338         printf_filtered (_("%s %s will be skipped when stepping.\n"),
 339                          function_text, function_to_print);
 340       }
 341     else
 342       {
 343         printf_filtered (_("%s %s in %s %s will be skipped"
 344                            " when stepping.\n"),
 345                          function_text, function_to_print,
 346                          lower_file_text, file_to_print);
 347       }
 348   }
 349 }
 350
 351 static void
 352 info_skip_command (const char *arg, int from_tty)
 353 {
 354   int num_printable_entries = 0;
 355   struct value_print_options opts;
 356
 357   get_user_print_options (&opts);
 358
 359   /* Count the number of rows in the table and see if we need space for a
 360      64-bit address anywhere.  */
 361   for (const skiplist_entry &e : skiplist_entries)
 362     if (arg == NULL || number_is_in_list (arg, e.number ()))
 363       num_printable_entries++;
 364
 365   if (num_printable_entries == 0)
 366     {
 367       if (arg == NULL)
 368         current_uiout->message (_("Not skipping any files or functions.\n"));
 369       else
 370         current_uiout->message (
 371           _("No skiplist entries found with number %s.\n"), arg);
 372
 373       return;
 374     }
 375
 376   ui_out_emit_table table_emitter (current_uiout, 6, num_printable_entries,
 377                                    "SkiplistTable");
 378
 379   current_uiout->table_header (5, ui_left, "number", "Num");   /* 1 */
 380   current_uiout->table_header (3, ui_left, "enabled", "Enb");  /* 2 */
 381   current_uiout->table_header (4, ui_right, "regexp", "Glob"); /* 3 */
 382   current_uiout->table_header (20, ui_left, "file", "File");   /* 4 */
 383   current_uiout->table_header (2, ui_right, "regexp", "RE");   /* 5 */
 384   current_uiout->table_header (40, ui_noalign, "function", "Function"); /* 6 */
 385   current_uiout->table_body ();
 386
 387   for (const skiplist_entry &e : skiplist_entries)
 388     {
 389       QUIT;
 390       if (arg != NULL && !number_is_in_list (arg, e.number ()))
 391         continue;
 392
 393       ui_out_emit_tuple tuple_emitter (current_uiout, "blklst-entry");
 394       current_uiout->field_signed ("number", e.number ()); /* 1 */
 395
 396       if (e.enabled ())
 397         current_uiout->field_string ("enabled", "y"); /* 2 */
 398       else
 399         current_uiout->field_string ("enabled", "n"); /* 2 */
 400
 401       if (e.file_is_glob ())
 402         current_uiout->field_string ("regexp", "y"); /* 3 */
 403       else
 404         current_uiout->field_string ("regexp", "n"); /* 3 */
 405
 406       current_uiout->field_string ("file",
 407                                    e.file ().empty () ? "<none>"
 408                                    : e.file ().c_str (),
 409                                    e.file ().empty ()
 410                                    ? metadata_style.style ()
 411                                    : file_name_style.style ()); /* 4 */
 412       if (e.function_is_regexp ())
 413         current_uiout->field_string ("regexp", "y"); /* 5 */
 414       else
 415         current_uiout->field_string ("regexp", "n"); /* 5 */
 416
 417       current_uiout->field_string ("function",
 418                                    e.function ().empty () ? "<none>"
 419                                    : e.function ().c_str (),
 420                                    e.function ().empty ()
 421                                    ? metadata_style.style ()
 422                                    : function_name_style.style ()); /* 6 */
 423
 424       current_uiout->text ("\n");
 425     }
 426 }
 427
 428 static void
 429 skip_enable_command (const char *arg, int from_tty)
 430 {
 431   bool found = false;
 432
 433   for (skiplist_entry &e : skiplist_entries)
 434     if (arg == NULL || number_is_in_list (arg, e.number ()))
 435       {
 436         e.enable ();
 437         found = true;
 438       }
 439
 440   if (!found)
 441     error (_("No skiplist entries found with number %s."), arg);
 442 }
 443
 444 static void
 445 skip_disable_command (const char *arg, int from_tty)
 446 {
 447   bool found = false;
 448
 449   for (skiplist_entry &e : skiplist_entries)
 450     if (arg == NULL || number_is_in_list (arg, e.number ()))
 451       {
 452         e.disable ();
 453         found = true;
 454       }
 455
 456   if (!found)
 457     error (_("No skiplist entries found with number %s."), arg);
 458 }
 459
 460 static void
 461 skip_delete_command (const char *arg, int from_tty)
 462 {
 463   bool found = false;
 464
 465   for (auto it = skiplist_entries.begin (),
 466          end = skiplist_entries.end ();
 467        it != end;)
 468     {
 469       const skiplist_entry &e = *it;
 470
 471       if (arg == NULL || number_is_in_list (arg, e.number ()))
 472         {
 473           it = skiplist_entries.erase (it);
 474           found = true;
 475         }
 476       else
 477         ++it;
 478     }
 479
 480   if (!found)
 481     error (_("No skiplist entries found with number %s."), arg);
 482 }
 483
 484 bool
 485 skiplist_entry::do_skip_file_p (const symtab_and_line &function_sal) const
 486 {
 487   if (debug_skip)
 488     fprintf_unfiltered (gdb_stdlog,
 489                         "skip: checking if file %s matches non-glob %s...",
 490                         function_sal.symtab->filename, m_file.c_str ());
 491
 492   bool result;
 493
 494   /* Check first sole SYMTAB->FILENAME.  It may not be a substring of
 495      symtab_to_fullname as it may contain "./" etc.  */
 496   if (compare_filenames_for_search (function_sal.symtab->filename,
 497                                     m_file.c_str ()))
 498     result = true;
 499
 500   /* Before we invoke realpath, which can get expensive when many
 501      files are involved, do a quick comparison of the basenames.  */
 502   else if (!basenames_may_differ
 503            && filename_cmp (lbasename (function_sal.symtab->filename),
 504                             lbasename (m_file.c_str ())) != 0)
 505     result = false;
 506   else
 507     {
 508       /* Note: symtab_to_fullname caches its result, thus we don't have to.  */
 509       const char *fullname = symtab_to_fullname (function_sal.symtab);
 510
 511       result = compare_filenames_for_search (fullname, m_file.c_str ());
 512     }
 513
 514   if (debug_skip)
 515     fprintf_unfiltered (gdb_stdlog, result ? "yes.\n" : "no.\n");
 516
 517   return result;
 518 }
 519
 520 bool
 521 skiplist_entry::do_skip_gfile_p (const symtab_and_line &function_sal) const
 522 {
 523   if (debug_skip)
 524     fprintf_unfiltered (gdb_stdlog,
 525                         "skip: checking if file %s matches glob %s...",
 526                         function_sal.symtab->filename, m_file.c_str ());
 527
 528   bool result;
 529
 530   /* Check first sole SYMTAB->FILENAME.  It may not be a substring of
 531      symtab_to_fullname as it may contain "./" etc.  */
 532   if (gdb_filename_fnmatch (m_file.c_str (), function_sal.symtab->filename,
 533                             FNM_FILE_NAME | FNM_NOESCAPE) == 0)
 534     result = true;
 535
 536   /* Before we invoke symtab_to_fullname, which is expensive, do a quick
 537      comparison of the basenames.
 538      Note that we assume that lbasename works with glob-style patterns.
 539      If the basename of the glob pattern is something like "*.c" then this
 540      isn't much of a win.  Oh well.  */
 541   else if (!basenames_may_differ
 542       && gdb_filename_fnmatch (lbasename (m_file.c_str ()),
 543                                lbasename (function_sal.symtab->filename),
 544                                FNM_FILE_NAME | FNM_NOESCAPE) != 0)
 545     result = false;
 546   else
 547     {
 548       /* Note: symtab_to_fullname caches its result, thus we don't have to.  */
 549       const char *fullname = symtab_to_fullname (function_sal.symtab);
 550
 551       result = compare_glob_filenames_for_search (fullname, m_file.c_str ());
 552     }
 553
 554   if (debug_skip)
 555     fprintf_unfiltered (gdb_stdlog, result ? "yes.\n" : "no.\n");
 556
 557   return result;
 558 }
 559
 560 bool
 561 skiplist_entry::skip_file_p (const symtab_and_line &function_sal) const
 562 {
 563   if (m_file.empty ())
 564     return false;
 565
 566   if (function_sal.symtab == NULL)
 567     return false;
 568
 569   if (m_file_is_glob)
 570     return do_skip_gfile_p (function_sal);
 571   else
 572     return do_skip_file_p (function_sal);
 573 }
 574
 575 bool
 576 skiplist_entry::skip_function_p (const char *function_name) const
 577 {
 578   if (m_function.empty ())
 579     return false;
 580
 581   bool result;
 582
 583   if (m_function_is_regexp)
 584     {
 585       if (debug_skip)
 586         fprintf_unfiltered (gdb_stdlog,
 587                             "skip: checking if function %s matches regex %s...",
 588                             function_name, m_function.c_str ());
 589
 590       gdb_assert (m_compiled_function_regexp);
 591       result
 592         = (m_compiled_function_regexp->exec (function_name, 0, NULL, 0) == 0);
 593     }
 594   else
 595     {
 596       if (debug_skip)
 597         fprintf_unfiltered (gdb_stdlog,
 598                             ("skip: checking if function %s matches non-regex "
 599                              "%s..."),
 600                             function_name, m_function.c_str ());
 601       result = (strcmp_iw (function_name, m_function.c_str ()) == 0);
 602     }
 603
 604   if (debug_skip)
 605     fprintf_unfiltered (gdb_stdlog, result ? "yes.\n" : "no.\n");
 606
 607   return result;
 608 }
 609
 610 /* See skip.h.  */
 611
 612 bool
 613 function_name_is_marked_for_skip (const char *function_name,
 614                                   const symtab_and_line &function_sal)
 615 {
 616   if (function_name == NULL)
 617     return false;
 618
 619   for (const skiplist_entry &e : skiplist_entries)
 620     {
 621       if (!e.enabled ())
 622         continue;
 623
 624       bool skip_by_file = e.skip_file_p (function_sal);
 625       bool skip_by_function = e.skip_function_p (function_name);
 626
 627       /* If both file and function must match, make sure we don't errantly
 628          exit if only one of them match.  */
 629       if (!e.file ().empty () && !e.function ().empty ())
 630         {
 631           if (skip_by_file && skip_by_function)
 632             return true;
 633         }
 634       /* Only one of file/function is specified.  */
 635       else if (skip_by_file || skip_by_function)
 636         return true;
 637     }
 638
 639   return false;
 640 }
 641
 642 /* Completer for skip numbers.  */
 643
 644 static void
 645 complete_skip_number (cmd_list_element *cmd,
 646                       completion_tracker &completer,
 647                       const char *text, const char *word)
 648 {
 649   size_t word_len = strlen (word);
 650
 651   for (const skiplist_entry &entry : skiplist_entries)
 652     {
 653       gdb::unique_xmalloc_ptr<char> name (xstrprintf ("%d", entry.number ()));
 654       if (strncmp (word, name.get (), word_len) == 0)
 655         completer.add_completion (std::move (name));
 656     }
 657 }
 658
 659 void _initialize_step_skip ();
 660 void
 661 _initialize_step_skip ()
 662 {
 663   static struct cmd_list_element *skiplist = NULL;
 664   struct cmd_list_element *c;
 665
 666   add_prefix_cmd ("skip", class_breakpoint, skip_command, _("\
 667 Ignore a function while stepping.\n\
 668 \n\
 669 Usage: skip [FUNCTION-NAME]\n\
 670        skip [FILE-SPEC] [FUNCTION-SPEC]\n\
 671 If no arguments are given, ignore the current function.\n\
 672 \n\
 673 FILE-SPEC is one of:\n\
 674        -fi|-file FILE-NAME\n\
 675        -gfi|-gfile GLOB-FILE-PATTERN\n\
 676 FUNCTION-SPEC is one of:\n\
 677        -fu|-function FUNCTION-NAME\n\
 678        -rfu|-rfunction FUNCTION-NAME-REGULAR-EXPRESSION"),
 679                   &skiplist, 1, &cmdlist);
 680
 681   c = add_cmd ("file", class_breakpoint, skip_file_command, _("\
 682 Ignore a file while stepping.\n\
 683 Usage: skip file [FILE-NAME]\n\
 684 If no filename is given, ignore the current file."),
 685                &skiplist);
 686   set_cmd_completer (c, filename_completer);
 687
 688   c = add_cmd ("function", class_breakpoint, skip_function_command, _("\
 689 Ignore a function while stepping.\n\
 690 Usage: skip function [FUNCTION-NAME]\n\
 691 If no function name is given, skip the current function."),
 692                &skiplist);
 693   set_cmd_completer (c, location_completer);
 694
 695   c = add_cmd ("enable", class_breakpoint, skip_enable_command, _("\
 696 Enable skip entries.\n\
 697 Usage: skip enable [NUMBER | RANGE]...\n\
 698 You can specify numbers (e.g. \"skip enable 1 3\"),\n\
 699 ranges (e.g. \"skip enable 4-8\"), or both (e.g. \"skip enable 1 3 4-8\").\n\n\
 700 If you don't specify any numbers or ranges, we'll enable all skip entries."),
 701                &skiplist);
 702   set_cmd_completer (c, complete_skip_number);
 703
 704   c = add_cmd ("disable", class_breakpoint, skip_disable_command, _("\
 705 Disable skip entries.\n\
 706 Usage: skip disable [NUMBER | RANGE]...\n\
 707 You can specify numbers (e.g. \"skip disable 1 3\"),\n\
 708 ranges (e.g. \"skip disable 4-8\"), or both (e.g. \"skip disable 1 3 4-8\").\n\n\
 709 If you don't specify any numbers or ranges, we'll disable all skip entries."),
 710                &skiplist);
 711   set_cmd_completer (c, complete_skip_number);
 712
 713   c = add_cmd ("delete", class_breakpoint, skip_delete_command, _("\
 714 Delete skip entries.\n\
 715 Usage: skip delete [NUMBER | RANGES]...\n\
 716 You can specify numbers (e.g. \"skip delete 1 3\"),\n\
 717 ranges (e.g. \"skip delete 4-8\"), or both (e.g. \"skip delete 1 3 4-8\").\n\n\
 718 If you don't specify any numbers or ranges, we'll delete all skip entries."),
 719                &skiplist);
 720   set_cmd_completer (c, complete_skip_number);
 721
 722   add_info ("skip", info_skip_command, _("\
 723 Display the status of skips.\n\
 724 Usage: info skip [NUMBER | RANGES]...\n\
 725 You can specify numbers (e.g. \"info skip 1 3\"), \n\
 726 ranges (e.g. \"info skip 4-8\"), or both (e.g. \"info skip 1 3 4-8\").\n\n\
 727 If you don't specify any numbers or ranges, we'll show all skips."));
 728   set_cmd_completer (c, complete_skip_number);
 729
 730   add_setshow_boolean_cmd ("skip", class_maintenance,
 731                            &debug_skip, _("\
 732 Set whether to print the debug output about skipping files and functions."),
 733                            _("\
 734 Show whether the debug output about skipping files and functions is printed."),
 735                            _("\
 736 When non-zero, debug output about skipping files and functions is displayed."),
 737                            NULL, NULL,
 738                            &setdebuglist, &showdebuglist);
 739 }