gdb/command.h

   1 /* Header file for command creation.
   2
   3    Copyright (C) 1986-2016 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 "gdb_vecs.h"
  22
  23 /* This file defines the public interface for any code wanting to
  24    create commands.  */
  25
  26 /* Command classes are top-level categories into which commands are
  27    broken down for "help" purposes.
  28
  29    Notes on classes: class_alias is for alias commands which are not
  30    abbreviations of the original command.  class-pseudo is for
  31    commands which are not really commands nor help topics ("stop").  */
  32
  33 enum command_class
  34 {
  35   /* Special args to help_list */
  36   class_deprecated = -3, all_classes = -2, all_commands = -1,
  37   /* Classes of commands */
  38   no_class = -1, class_run = 0, class_vars, class_stack, class_files,
  39   class_support, class_info, class_breakpoint, class_trace,
  40   class_alias, class_bookmark, class_obscure, class_maintenance,
  41   class_pseudo, class_tui, class_user, class_xdb,
  42   no_set_class  /* Used for "show" commands that have no corresponding
  43                    "set" command.  */
  44 };
  45
  46 /* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
  47    cmd_types'' can be moved from "command.h" to "cli-decode.h".  */
  48 /* Not a set/show command.  Note that some commands which begin with
  49    "set" or "show" might be in this category, if their syntax does
  50    not fall into one of the following categories.  */
  51 typedef enum cmd_types
  52   {
  53     not_set_cmd,
  54     set_cmd,
  55     show_cmd
  56   }
  57 cmd_types;
  58
  59 /* Types of "set" or "show" command.  */
  60 typedef enum var_types
  61   {
  62     /* "on" or "off".  *VAR is an integer which is nonzero for on,
  63        zero for off.  */
  64     var_boolean,
  65
  66     /* "on" / "true" / "enable" or "off" / "false" / "disable" or
  67        "auto.  *VAR is an ``enum auto_boolean''.  NOTE: In general a
  68        custom show command will need to be implemented - one that for
  69        "auto" prints both the "auto" and the current auto-selected
  70        value.  */
  71     var_auto_boolean,
  72
  73     /* Unsigned Integer.  *VAR is an unsigned int.  The user can type
  74        0 to mean "unlimited", which is stored in *VAR as UINT_MAX.  */
  75     var_uinteger,
  76
  77     /* Like var_uinteger but signed.  *VAR is an int.  The user can
  78        type 0 to mean "unlimited", which is stored in *VAR as
  79        INT_MAX.  The only remaining use of it is the Python API.
  80        Don't use it elsewhere.  */
  81     var_integer,
  82
  83     /* String which the user enters with escapes (e.g. the user types
  84        \n and it is a real newline in the stored string).
  85        *VAR is a malloc'd string, or NULL if the string is empty.  */
  86     var_string,
  87     /* String which stores what the user types verbatim.
  88        *VAR is a malloc'd string, or NULL if the string is empty.  */
  89     var_string_noescape,
  90     /* String which stores a filename.  (*VAR) is a malloc'd string,
  91        or "" if the string was empty.  */
  92     var_optional_filename,
  93     /* String which stores a filename.  (*VAR) is a malloc'd
  94        string.  */
  95     var_filename,
  96     /* ZeroableInteger.  *VAR is an int.  Like var_integer except
  97        that zero really means zero.  */
  98     var_zinteger,
  99     /* ZeroableUnsignedInteger.  *VAR is an unsigned int.  Zero really
 100        means zero.  */
 101     var_zuinteger,
 102     /* ZeroableUnsignedInteger with unlimited value.  *VAR is an int,
 103        but its range is [0, INT_MAX].  -1 stands for unlimited and
 104        other negative numbers are not allowed.  */
 105     var_zuinteger_unlimited,
 106     /* Enumerated type.  Can only have one of the specified values.
 107        *VAR is a char pointer to the name of the element that we
 108        find.  */
 109     var_enum
 110   }
 111 var_types;
 112
 113 /* This structure records one command'd definition.  */
 114 struct cmd_list_element;
 115
 116 typedef void cmd_cfunc_ftype (char *args, int from_tty);
 117
 118 /* This structure specifies notifications to be suppressed by a cli
 119    command interpreter.  */
 120
 121 struct cli_suppress_notification
 122 {
 123   /* Inferior, thread, frame selected notification suppressed?  */
 124   int user_selected_context;
 125 };
 126
 127 extern struct cli_suppress_notification cli_suppress_notification;
 128
 129 /* Forward-declarations of the entry-points of cli/cli-decode.c.  */
 130
 131 /* API to the manipulation of command lists.  */
 132
 133 extern int valid_user_defined_cmd_name_p (const char *name);
 134
 135 extern struct cmd_list_element *add_cmd (const char *, enum command_class,
 136                                          cmd_cfunc_ftype *fun,
 137                                          const char *,
 138                                          struct cmd_list_element **);
 139
 140 extern struct cmd_list_element *add_alias_cmd (const char *, const char *,
 141                                                enum command_class, int,
 142                                                struct cmd_list_element **);
 143
 144 extern struct cmd_list_element *add_prefix_cmd (const char *, enum command_class,
 145                                                 cmd_cfunc_ftype *fun,
 146                                                 const char *,
 147                                                 struct cmd_list_element **,
 148                                                 const char *, int,
 149                                                 struct cmd_list_element **);
 150
 151 extern struct cmd_list_element *add_abbrev_prefix_cmd (const char *,
 152                                                        enum command_class,
 153                                                        cmd_cfunc_ftype *fun,
 154                                                        const char *,
 155                                                        struct cmd_list_element
 156                                                        **, const char *, int,
 157                                                        struct cmd_list_element
 158                                                        **);
 159
 160 /* Set the commands corresponding callback.  */
 161
 162 extern void set_cmd_cfunc (struct cmd_list_element *cmd,
 163                            cmd_cfunc_ftype *cfunc);
 164
 165 typedef void cmd_sfunc_ftype (char *args, int from_tty,
 166                               struct cmd_list_element *c);
 167 extern void set_cmd_sfunc (struct cmd_list_element *cmd,
 168                            cmd_sfunc_ftype *sfunc);
 169
 170 typedef VEC (char_ptr) *completer_ftype (struct cmd_list_element *,
 171                                          const char *, const char *);
 172
 173 typedef void completer_ftype_void (struct cmd_list_element *,
 174                                    const char *, const char *);
 175
 176 extern void set_cmd_completer (struct cmd_list_element *, completer_ftype *);
 177
 178 /* Set the completer_handle_brkchars callback.  */
 179
 180 extern void set_cmd_completer_handle_brkchars (struct cmd_list_element *,
 181                                                completer_ftype_void *);
 182
 183 /* HACK: cagney/2002-02-23: Code, mostly in tracepoints.c, grubs
 184    around in cmd objects to test the value of the commands sfunc().  */
 185 extern int cmd_cfunc_eq (struct cmd_list_element *cmd,
 186                          cmd_cfunc_ftype *cfun);
 187
 188 /* Each command object has a local context attached to it.  */
 189 extern void set_cmd_context (struct cmd_list_element *cmd,
 190                              void *context);
 191 extern void *get_cmd_context (struct cmd_list_element *cmd);
 192
 193
 194 /* Execute CMD's pre/post hook.  Throw an error if the command fails.
 195    If already executing this pre/post hook, or there is no pre/post
 196    hook, the call is silently ignored.  */
 197 extern void execute_cmd_pre_hook (struct cmd_list_element *cmd);
 198 extern void execute_cmd_post_hook (struct cmd_list_element *cmd);
 199
 200 /* Return the type of the command.  */
 201 extern enum cmd_types cmd_type (struct cmd_list_element *cmd);
 202
 203 /* Flag for an ambiguous cmd_list result.  */
 204 #define CMD_LIST_AMBIGUOUS ((struct cmd_list_element *) -1)
 205
 206 extern struct cmd_list_element *lookup_cmd (const char **,
 207                                             struct cmd_list_element *, char *,
 208                                             int, int);
 209
 210 extern struct cmd_list_element *lookup_cmd_1 (const char **,
 211                                               struct cmd_list_element *,
 212                                               struct cmd_list_element **,
 213                                               int);
 214
 215 extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
 216                                                const char * );
 217
 218 extern void deprecated_cmd_warning (const char *);
 219
 220 extern int lookup_cmd_composition (const char *text,
 221                                    struct cmd_list_element **alias,
 222                                    struct cmd_list_element **prefix_cmd,
 223                                    struct cmd_list_element **cmd);
 224
 225 extern struct cmd_list_element *add_com (const char *, enum command_class,
 226                                          cmd_cfunc_ftype *fun,
 227                                          const char *);
 228
 229 extern struct cmd_list_element *add_com_alias (const char *, const char *,
 230                                                enum command_class, int);
 231
 232 extern struct cmd_list_element *add_com_suppress_notification
 233                        (const char *name, enum command_class theclass,
 234                         cmd_cfunc_ftype *fun, const char *doc,
 235                         int *supress_notification);
 236
 237 extern struct cmd_list_element *add_info (const char *,
 238                                           cmd_cfunc_ftype *fun,
 239                                           const char *);
 240
 241 extern struct cmd_list_element *add_info_alias (const char *, const char *,
 242                                                 int);
 243
 244 extern VEC (char_ptr) *complete_on_cmdlist (struct cmd_list_element *,
 245                                             const char *, const char *, int);
 246
 247 extern VEC (char_ptr) *complete_on_enum (const char *const *enumlist,
 248                                          const char *, const char *);
 249
 250 /* Functions that implement commands about CLI commands.  */
 251
 252 extern void help_list (struct cmd_list_element *, const char *,
 253                        enum command_class, struct ui_file *);
 254
 255 /* Method for show a set/show variable's VALUE on FILE.  If this
 256    method isn't supplied deprecated_show_value_hack() is called (which
 257    is not good).  */
 258 typedef void (show_value_ftype) (struct ui_file *file,
 259                                  int from_tty,
 260                                  struct cmd_list_element *cmd,
 261                                  const char *value);
 262 /* NOTE: i18n: This function is not i18n friendly.  Callers should
 263    instead print the value out directly.  */
 264 extern show_value_ftype deprecated_show_value_hack;
 265
 266 extern void add_setshow_enum_cmd (const char *name,
 267                                   enum command_class theclass,
 268                                   const char *const *enumlist,
 269                                   const char **var,
 270                                   const char *set_doc,
 271                                   const char *show_doc,
 272                                   const char *help_doc,
 273                                   cmd_sfunc_ftype *set_func,
 274                                   show_value_ftype *show_func,
 275                                   struct cmd_list_element **set_list,
 276                                   struct cmd_list_element **show_list);
 277
 278 extern void add_setshow_auto_boolean_cmd (const char *name,
 279                                           enum command_class theclass,
 280                                           enum auto_boolean *var,
 281                                           const char *set_doc,
 282                                           const char *show_doc,
 283                                           const char *help_doc,
 284                                           cmd_sfunc_ftype *set_func,
 285                                           show_value_ftype *show_func,
 286                                           struct cmd_list_element **set_list,
 287                                           struct cmd_list_element **show_list);
 288
 289 extern void add_setshow_boolean_cmd (const char *name,
 290                                      enum command_class theclass,
 291                                      int *var,
 292                                      const char *set_doc, const char *show_doc,
 293                                      const char *help_doc,
 294                                      cmd_sfunc_ftype *set_func,
 295                                      show_value_ftype *show_func,
 296                                      struct cmd_list_element **set_list,
 297                                      struct cmd_list_element **show_list);
 298
 299 extern void add_setshow_filename_cmd (const char *name,
 300                                       enum command_class theclass,
 301                                       char **var,
 302                                       const char *set_doc,
 303                                       const char *show_doc,
 304                                       const char *help_doc,
 305                                       cmd_sfunc_ftype *set_func,
 306                                       show_value_ftype *show_func,
 307                                       struct cmd_list_element **set_list,
 308                                       struct cmd_list_element **show_list);
 309
 310 extern void add_setshow_string_cmd (const char *name,
 311                                     enum command_class theclass,
 312                                     char **var,
 313                                     const char *set_doc,
 314                                     const char *show_doc,
 315                                     const char *help_doc,
 316                                     cmd_sfunc_ftype *set_func,
 317                                     show_value_ftype *show_func,
 318                                     struct cmd_list_element **set_list,
 319                                     struct cmd_list_element **show_list);
 320
 321 extern struct cmd_list_element *add_setshow_string_noescape_cmd
 322                       (const char *name,
 323                        enum command_class theclass,
 324                        char **var,
 325                        const char *set_doc,
 326                        const char *show_doc,
 327                        const char *help_doc,
 328                        cmd_sfunc_ftype *set_func,
 329                        show_value_ftype *show_func,
 330                        struct cmd_list_element **set_list,
 331                        struct cmd_list_element **show_list);
 332
 333 extern void add_setshow_optional_filename_cmd (const char *name,
 334                                                enum command_class theclass,
 335                                                char **var,
 336                                                const char *set_doc,
 337                                                const char *show_doc,
 338                                                const char *help_doc,
 339                                                cmd_sfunc_ftype *set_func,
 340                                                show_value_ftype *show_func,
 341                                                struct cmd_list_element **set_list,
 342                                                struct cmd_list_element **show_list);
 343
 344 extern void add_setshow_integer_cmd (const char *name,
 345                                      enum command_class theclass,
 346                                      int *var,
 347                                      const char *set_doc,
 348                                      const char *show_doc,
 349                                      const char *help_doc,
 350                                      cmd_sfunc_ftype *set_func,
 351                                      show_value_ftype *show_func,
 352                                      struct cmd_list_element **set_list,
 353                                      struct cmd_list_element **show_list);
 354
 355 extern void add_setshow_uinteger_cmd (const char *name,
 356                                       enum command_class theclass,
 357                                       unsigned int *var,
 358                                       const char *set_doc,
 359                                       const char *show_doc,
 360                                       const char *help_doc,
 361                                       cmd_sfunc_ftype *set_func,
 362                                       show_value_ftype *show_func,
 363                                       struct cmd_list_element **set_list,
 364                                       struct cmd_list_element **show_list);
 365
 366 extern void add_setshow_zinteger_cmd (const char *name,
 367                                       enum command_class theclass,
 368                                       int *var,
 369                                       const char *set_doc,
 370                                       const char *show_doc,
 371                                       const char *help_doc,
 372                                       cmd_sfunc_ftype *set_func,
 373                                       show_value_ftype *show_func,
 374                                       struct cmd_list_element **set_list,
 375                                       struct cmd_list_element **show_list);
 376
 377 extern void add_setshow_zuinteger_cmd (const char *name,
 378                                        enum command_class theclass,
 379                                        unsigned int *var,
 380                                        const char *set_doc,
 381                                        const char *show_doc,
 382                                        const char *help_doc,
 383                                        cmd_sfunc_ftype *set_func,
 384                                        show_value_ftype *show_func,
 385                                        struct cmd_list_element **set_list,
 386                                        struct cmd_list_element **show_list);
 387
 388 extern void
 389   add_setshow_zuinteger_unlimited_cmd (const char *name,
 390                                        enum command_class theclass,
 391                                        int *var,
 392                                        const char *set_doc,
 393                                        const char *show_doc,
 394                                        const char *help_doc,
 395                                        cmd_sfunc_ftype *set_func,
 396                                        show_value_ftype *show_func,
 397                                        struct cmd_list_element **set_list,
 398                                        struct cmd_list_element **show_list);
 399
 400 /* Do a "show" command for each thing on a command list.  */
 401
 402 extern void cmd_show_list (struct cmd_list_element *, int, const char *);
 403
 404 /* Used everywhere whenever at least one parameter is required and
 405    none is specified.  */
 406
 407 extern void error_no_arg (const char *) ATTRIBUTE_NORETURN;
 408
 409 extern void dont_repeat (void);
 410
 411 extern struct cleanup *prevent_dont_repeat (void);
 412
 413 /* Used to mark commands that don't do anything.  If we just leave the
 414    function field NULL, the command is interpreted as a help topic, or
 415    as a class of commands.  */
 416
 417 extern void not_just_help_class_command (char *, int);
 418
 419 /* Check function pointer.  */
 420 extern int cmd_func_p (struct cmd_list_element *cmd);
 421
 422 /* Call the command function.  */
 423 extern void cmd_func (struct cmd_list_element *cmd,
 424                       char *args, int from_tty);
 425
 426 #endif /* !defined (COMMAND_H) */