gdb/command.h

   1 /* Header file for command creation.
   2
   3    Copyright (C) 1986-2019 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 #if !defined (COMMAND_H)
  19 #define COMMAND_H 1
  20
  21 #include "common/gdb_vecs.h"
  22 #include "common/scoped_restore.h"
  23
  24 struct completion_tracker;
  25
  26 /* This file defines the public interface for any code wanting to
  27    create commands.  */
  28
  29 /* Command classes are top-level categories into which commands are
  30    broken down for "help" purposes.
  31
  32    Notes on classes: class_alias is for alias commands which are not
  33    abbreviations of the original command.  class-pseudo is for
  34    commands which are not really commands nor help topics ("stop").  */
  35
  36 enum command_class
  37 {
  38   /* Special args to help_list */
  39   class_deprecated = -3, all_classes = -2, all_commands = -1,
  40   /* Classes of commands */
  41   no_class = -1, class_run = 0, class_vars, class_stack, class_files,
  42   class_support, class_info, class_breakpoint, class_trace,
  43   class_alias, class_bookmark, class_obscure, class_maintenance,
  44   class_pseudo, class_tui, class_user, class_xdb,
  45   no_set_class  /* Used for "show" commands that have no corresponding
  46                    "set" command.  */
  47 };
  48
  49 /* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
  50    cmd_types'' can be moved from "command.h" to "cli-decode.h".  */
  51 /* Not a set/show command.  Note that some commands which begin with
  52    "set" or "show" might be in this category, if their syntax does
  53    not fall into one of the following categories.  */
  54 typedef enum cmd_types
  55   {
  56     not_set_cmd,
  57     set_cmd,
  58     show_cmd
  59   }
  60 cmd_types;
  61
  62 /* Types of "set" or "show" command.  */
  63 typedef enum var_types
  64   {
  65     /* "on" or "off".  *VAR is an integer which is nonzero for on,
  66        zero for off.  */
  67     var_boolean,
  68
  69     /* "on" / "true" / "enable" or "off" / "false" / "disable" or
  70        "auto.  *VAR is an ``enum auto_boolean''.  NOTE: In general a
  71        custom show command will need to be implemented - one that for
  72        "auto" prints both the "auto" and the current auto-selected
  73        value.  */
  74     var_auto_boolean,
  75
  76     /* Unsigned Integer.  *VAR is an unsigned int.  The user can type
  77        0 to mean "unlimited", which is stored in *VAR as UINT_MAX.  */
  78     var_uinteger,
  79
  80     /* Like var_uinteger but signed.  *VAR is an int.  The user can
  81        type 0 to mean "unlimited", which is stored in *VAR as
  82        INT_MAX.  The only remaining use of it is the Python API.
  83        Don't use it elsewhere.  */
  84     var_integer,
  85
  86     /* String which the user enters with escapes (e.g. the user types
  87        \n and it is a real newline in the stored string).
  88        *VAR is a malloc'd string, or NULL if the string is empty.  */
  89     var_string,
  90     /* String which stores what the user types verbatim.
  91        *VAR is a malloc'd string, or NULL if the string is empty.  */
  92     var_string_noescape,
  93     /* String which stores a filename.  (*VAR) is a malloc'd string,
  94        or "" if the string was empty.  */
  95     var_optional_filename,
  96     /* String which stores a filename.  (*VAR) is a malloc'd
  97        string.  */
  98     var_filename,
  99     /* ZeroableInteger.  *VAR is an int.  Like var_integer except
 100        that zero really means zero.  */
 101     var_zinteger,
 102     /* ZeroableUnsignedInteger.  *VAR is an unsigned int.  Zero really
 103        means zero.  */
 104     var_zuinteger,
 105     /* ZeroableUnsignedInteger with unlimited value.  *VAR is an int,
 106        but its range is [0, INT_MAX].  -1 stands for unlimited and
 107        other negative numbers are not allowed.  */
 108     var_zuinteger_unlimited,
 109     /* Enumerated type.  Can only have one of the specified values.
 110        *VAR is a char pointer to the name of the element that we
 111        find.  */
 112     var_enum
 113   }
 114 var_types;
 115
 116 /* This structure records one command'd definition.  */
 117 struct cmd_list_element;
 118
 119 typedef void cmd_const_cfunc_ftype (const char *args, int from_tty);
 120
 121 /* This structure specifies notifications to be suppressed by a cli
 122    command interpreter.  */
 123
 124 struct cli_suppress_notification
 125 {
 126   /* Inferior, thread, frame selected notification suppressed?  */
 127   int user_selected_context;
 128 };
 129
 130 extern struct cli_suppress_notification cli_suppress_notification;
 131
 132 /* Forward-declarations of the entry-points of cli/cli-decode.c.  */
 133
 134 /* API to the manipulation of command lists.  */
 135
 136 extern bool valid_user_defined_cmd_name_p (const char *name);
 137
 138 /* Const-correct variant of the above.  */
 139
 140 extern struct cmd_list_element *add_cmd (const char *, enum command_class,
 141                                          cmd_const_cfunc_ftype *fun,
 142                                          const char *,
 143                                          struct cmd_list_element **);
 144
 145 /* Like add_cmd, but no command function is specified.  */
 146
 147 extern struct cmd_list_element *add_cmd (const char *, enum command_class,
 148                                          const char *,
 149                                          struct cmd_list_element **);
 150
 151 extern struct cmd_list_element *add_cmd_suppress_notification
 152                         (const char *name, enum command_class theclass,
 153                          cmd_const_cfunc_ftype *fun, const char *doc,
 154                          struct cmd_list_element **list,
 155                          int *suppress_notification);
 156
 157 extern struct cmd_list_element *add_alias_cmd (const char *, const char *,
 158                                                enum command_class, int,
 159                                                struct cmd_list_element **);
 160
 161 extern struct cmd_list_element *add_alias_cmd (const char *,
 162                                                cmd_list_element *,
 163                                                enum command_class, int,
 164                                                struct cmd_list_element **);
 165
 166
 167 extern struct cmd_list_element *add_prefix_cmd (const char *, enum command_class,
 168                                                 cmd_const_cfunc_ftype *fun,
 169                                                 const char *,
 170                                                 struct cmd_list_element **,
 171                                                 const char *, int,
 172                                                 struct cmd_list_element **);
 173
 174 extern struct cmd_list_element *add_prefix_cmd_suppress_notification
 175                         (const char *name, enum command_class theclass,
 176                          cmd_const_cfunc_ftype *fun,
 177                          const char *doc, struct cmd_list_element **prefixlist,
 178                          const char *prefixname, int allow_unknown,
 179                          struct cmd_list_element **list,
 180                          int *suppress_notification);
 181
 182 extern struct cmd_list_element *add_abbrev_prefix_cmd (const char *,
 183                                                        enum command_class,
 184                                                        cmd_const_cfunc_ftype *fun,
 185                                                        const char *,
 186                                                        struct cmd_list_element
 187                                                        **, const char *, int,
 188                                                        struct cmd_list_element
 189                                                        **);
 190
 191 typedef void cmd_const_sfunc_ftype (const char *args, int from_tty,
 192                                     struct cmd_list_element *c);
 193 extern void set_cmd_sfunc (struct cmd_list_element *cmd,
 194                            cmd_const_sfunc_ftype *sfunc);
 195
 196 /* A completion routine.  Add possible completions to tracker.
 197
 198    TEXT is the text beyond what was matched for the command itself
 199    (leading whitespace is skipped).  It stops where we are supposed to
 200    stop completing (rl_point) and is '\0' terminated.  WORD points in
 201    the same buffer as TEXT, and completions should be returned
 202    relative to this position.  For example, suppose TEXT is "foo" and
 203    we want to complete to "foobar".  If WORD is "oo", return "oobar";
 204    if WORD is "baz/foo", return "baz/foobar".  */
 205 typedef void completer_ftype (struct cmd_list_element *,
 206                               completion_tracker &tracker,
 207                               const char *text, const char *word);
 208
 209 /* Same, but for set_cmd_completer_handle_brkchars.  */
 210 typedef void completer_handle_brkchars_ftype (struct cmd_list_element *,
 211                                               completion_tracker &tracker,
 212                                               const char *text, const char *word);
 213
 214 extern void set_cmd_completer (struct cmd_list_element *, completer_ftype *);
 215
 216 /* Set the completer_handle_brkchars callback.  */
 217
 218 extern void set_cmd_completer_handle_brkchars (struct cmd_list_element *,
 219                                                completer_handle_brkchars_ftype *);
 220
 221 /* HACK: cagney/2002-02-23: Code, mostly in tracepoints.c, grubs
 222    around in cmd objects to test the value of the commands sfunc().  */
 223 extern int cmd_cfunc_eq (struct cmd_list_element *cmd,
 224                          cmd_const_cfunc_ftype *cfun);
 225
 226 /* Each command object has a local context attached to it.  */
 227 extern void set_cmd_context (struct cmd_list_element *cmd,
 228                              void *context);
 229 extern void *get_cmd_context (struct cmd_list_element *cmd);
 230
 231
 232 /* Execute CMD's pre/post hook.  Throw an error if the command fails.
 233    If already executing this pre/post hook, or there is no pre/post
 234    hook, the call is silently ignored.  */
 235 extern void execute_cmd_pre_hook (struct cmd_list_element *cmd);
 236 extern void execute_cmd_post_hook (struct cmd_list_element *cmd);
 237
 238 /* Return the type of the command.  */
 239 extern enum cmd_types cmd_type (struct cmd_list_element *cmd);
 240
 241 /* Flag for an ambiguous cmd_list result.  */
 242 #define CMD_LIST_AMBIGUOUS ((struct cmd_list_element *) -1)
 243
 244 extern struct cmd_list_element *lookup_cmd (const char **,
 245                                             struct cmd_list_element *,
 246                                             const char *,
 247                                             int, int);
 248
 249 extern struct cmd_list_element *lookup_cmd_1 (const char **,
 250                                               struct cmd_list_element *,
 251                                               struct cmd_list_element **,
 252                                               int);
 253
 254 extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
 255                                                const char * );
 256
 257 extern void deprecated_cmd_warning (const char *);
 258
 259 extern int lookup_cmd_composition (const char *text,
 260                                    struct cmd_list_element **alias,
 261                                    struct cmd_list_element **prefix_cmd,
 262                                    struct cmd_list_element **cmd);
 263
 264 extern struct cmd_list_element *add_com (const char *, enum command_class,
 265                                          cmd_const_cfunc_ftype *fun,
 266                                          const char *);
 267
 268 extern struct cmd_list_element *add_com_alias (const char *, const char *,
 269                                                enum command_class, int);
 270
 271 extern struct cmd_list_element *add_com_suppress_notification
 272                        (const char *name, enum command_class theclass,
 273                         cmd_const_cfunc_ftype *fun, const char *doc,
 274                         int *supress_notification);
 275
 276 extern struct cmd_list_element *add_info (const char *,
 277                                           cmd_const_cfunc_ftype *fun,
 278                                           const char *);
 279
 280 extern struct cmd_list_element *add_info_alias (const char *, const char *,
 281                                                 int);
 282
 283 extern void complete_on_cmdlist (struct cmd_list_element *,
 284                                  completion_tracker &tracker,
 285                                  const char *, const char *, int);
 286
 287 extern void complete_on_enum (completion_tracker &tracker,
 288                               const char *const *enumlist,
 289                               const char *, const char *);
 290
 291 /* Functions that implement commands about CLI commands.  */
 292
 293 extern void help_list (struct cmd_list_element *, const char *,
 294                        enum command_class, struct ui_file *);
 295
 296 /* Method for show a set/show variable's VALUE on FILE.  If this
 297    method isn't supplied deprecated_show_value_hack() is called (which
 298    is not good).  */
 299 typedef void (show_value_ftype) (struct ui_file *file,
 300                                  int from_tty,
 301                                  struct cmd_list_element *cmd,
 302                                  const char *value);
 303 /* NOTE: i18n: This function is not i18n friendly.  Callers should
 304    instead print the value out directly.  */
 305 extern show_value_ftype deprecated_show_value_hack;
 306
 307 extern void add_setshow_enum_cmd (const char *name,
 308                                   enum command_class theclass,
 309                                   const char *const *enumlist,
 310                                   const char **var,
 311                                   const char *set_doc,
 312                                   const char *show_doc,
 313                                   const char *help_doc,
 314                                   cmd_const_sfunc_ftype *set_func,
 315                                   show_value_ftype *show_func,
 316                                   struct cmd_list_element **set_list,
 317                                   struct cmd_list_element **show_list,
 318                                   void *context = nullptr);
 319
 320 extern void add_setshow_auto_boolean_cmd (const char *name,
 321                                           enum command_class theclass,
 322                                           enum auto_boolean *var,
 323                                           const char *set_doc,
 324                                           const char *show_doc,
 325                                           const char *help_doc,
 326                                           cmd_const_sfunc_ftype *set_func,
 327                                           show_value_ftype *show_func,
 328                                           struct cmd_list_element **set_list,
 329                                           struct cmd_list_element **show_list);
 330
 331 extern cmd_list_element *
 332   add_setshow_boolean_cmd (const char *name,
 333                            enum command_class theclass,
 334                            int *var,
 335                            const char *set_doc, const char *show_doc,
 336                            const char *help_doc,
 337                            cmd_const_sfunc_ftype *set_func,
 338                            show_value_ftype *show_func,
 339                            struct cmd_list_element **set_list,
 340                            struct cmd_list_element **show_list);
 341
 342 extern void add_setshow_filename_cmd (const char *name,
 343                                       enum command_class theclass,
 344                                       char **var,
 345                                       const char *set_doc,
 346                                       const char *show_doc,
 347                                       const char *help_doc,
 348                                       cmd_const_sfunc_ftype *set_func,
 349                                       show_value_ftype *show_func,
 350                                       struct cmd_list_element **set_list,
 351                                       struct cmd_list_element **show_list);
 352
 353 extern void add_setshow_string_cmd (const char *name,
 354                                     enum command_class theclass,
 355                                     char **var,
 356                                     const char *set_doc,
 357                                     const char *show_doc,
 358                                     const char *help_doc,
 359                                     cmd_const_sfunc_ftype *set_func,
 360                                     show_value_ftype *show_func,
 361                                     struct cmd_list_element **set_list,
 362                                     struct cmd_list_element **show_list);
 363
 364 extern struct cmd_list_element *add_setshow_string_noescape_cmd
 365                       (const char *name,
 366                        enum command_class theclass,
 367                        char **var,
 368                        const char *set_doc,
 369                        const char *show_doc,
 370                        const char *help_doc,
 371                        cmd_const_sfunc_ftype *set_func,
 372                        show_value_ftype *show_func,
 373                        struct cmd_list_element **set_list,
 374                        struct cmd_list_element **show_list);
 375
 376 extern void add_setshow_optional_filename_cmd (const char *name,
 377                                                enum command_class theclass,
 378                                                char **var,
 379                                                const char *set_doc,
 380                                                const char *show_doc,
 381                                                const char *help_doc,
 382                                                cmd_const_sfunc_ftype *set_func,
 383                                                show_value_ftype *show_func,
 384                                                struct cmd_list_element **set_list,
 385                                                struct cmd_list_element **show_list);
 386
 387 extern void add_setshow_integer_cmd (const char *name,
 388                                      enum command_class theclass,
 389                                      int *var,
 390                                      const char *set_doc,
 391                                      const char *show_doc,
 392                                      const char *help_doc,
 393                                      cmd_const_sfunc_ftype *set_func,
 394                                      show_value_ftype *show_func,
 395                                      struct cmd_list_element **set_list,
 396                                      struct cmd_list_element **show_list);
 397
 398 extern void add_setshow_uinteger_cmd (const char *name,
 399                                       enum command_class theclass,
 400                                       unsigned int *var,
 401                                       const char *set_doc,
 402                                       const char *show_doc,
 403                                       const char *help_doc,
 404                                       cmd_const_sfunc_ftype *set_func,
 405                                       show_value_ftype *show_func,
 406                                       struct cmd_list_element **set_list,
 407                                       struct cmd_list_element **show_list);
 408
 409 extern void add_setshow_zinteger_cmd (const char *name,
 410                                       enum command_class theclass,
 411                                       int *var,
 412                                       const char *set_doc,
 413                                       const char *show_doc,
 414                                       const char *help_doc,
 415                                       cmd_const_sfunc_ftype *set_func,
 416                                       show_value_ftype *show_func,
 417                                       struct cmd_list_element **set_list,
 418                                       struct cmd_list_element **show_list);
 419
 420 extern void add_setshow_zuinteger_cmd (const char *name,
 421                                        enum command_class theclass,
 422                                        unsigned int *var,
 423                                        const char *set_doc,
 424                                        const char *show_doc,
 425                                        const char *help_doc,
 426                                        cmd_const_sfunc_ftype *set_func,
 427                                        show_value_ftype *show_func,
 428                                        struct cmd_list_element **set_list,
 429                                        struct cmd_list_element **show_list);
 430
 431 extern void
 432   add_setshow_zuinteger_unlimited_cmd (const char *name,
 433                                        enum command_class theclass,
 434                                        int *var,
 435                                        const char *set_doc,
 436                                        const char *show_doc,
 437                                        const char *help_doc,
 438                                        cmd_const_sfunc_ftype *set_func,
 439                                        show_value_ftype *show_func,
 440                                        struct cmd_list_element **set_list,
 441                                        struct cmd_list_element **show_list);
 442
 443 /* Do a "show" command for each thing on a command list.  */
 444
 445 extern void cmd_show_list (struct cmd_list_element *, int, const char *);
 446
 447 /* Used everywhere whenever at least one parameter is required and
 448    none is specified.  */
 449
 450 extern void error_no_arg (const char *) ATTRIBUTE_NORETURN;
 451
 452
 453 /* Command line saving and repetition.
 454    Each input line executed is saved to possibly be repeated either
 455    when the user types an empty line, or be repeated by a command
 456    that wants to repeat the previously executed command.  The below
 457    functions control command repetition.  */
 458
 459 /* Commands call dont_repeat if they do not want to be repeated by null
 460    lines or by repeat_previous ().  */
 461
 462 extern void dont_repeat ();
 463
 464 /* Commands call repeat_previous if they want to repeat the previous command.
 465    Such commands that repeat the previous command must indicate
 466    to not repeat themselves, to avoid recursive repeat.
 467    repeat_previous will mark the current command as not repeating,
 468    and will ensure get_saved_command_line returns the previous command,
 469    so that the currently executing command can repeat it.  */
 470
 471 extern void repeat_previous ();
 472
 473 /* Prevent dont_repeat from working, and return a cleanup that
 474    restores the previous state.  */
 475
 476 extern scoped_restore_tmpl<int> prevent_dont_repeat (void);
 477
 478 /* Set the arguments that will be passed if the current command is
 479    repeated.  Note that the passed-in string must be a constant.  */
 480
 481 extern void set_repeat_arguments (const char *args);
 482
 483 /* Returns the saved command line to repeat.
 484    When a command is being executed, this is the currently executing
 485    command line, unless the currently executing command has called
 486    repeat_previous (): in this case, get_saved_command_line returns
 487    the previously saved command line.  */
 488
 489 extern char *get_saved_command_line ();
 490
 491 /* Takes a copy of CMD, for possible repetition.  */
 492
 493 extern void save_command_line (const char *cmd);
 494
 495 /* Used to mark commands that don't do anything.  If we just leave the
 496    function field NULL, the command is interpreted as a help topic, or
 497    as a class of commands.  */
 498
 499 extern void not_just_help_class_command (const char *, int);
 500
 501 /* Check function pointer.  */
 502 extern int cmd_func_p (struct cmd_list_element *cmd);
 503
 504 /* Call the command function.  */
 505 extern void cmd_func (struct cmd_list_element *cmd,
 506                       const char *args, int from_tty);
 507
 508 #endif /* !defined (COMMAND_H) */