gdb/command.h

   1 /* ***DEPRECATED***  The gdblib files must not be calling/using things in any
   2    of the possible command languages.  If necessary, a hook (that may be
   3    present or not) must be used and set to the appropriate routine by any
   4    command language that cares about it.  If you are having to include this
   5    file you are possibly doing things the old way.  This file will disapear.
   6    2000-12-01 fnasser@redhat.com    */
   7
   8 /* Header file for command-reading library command.c.
   9    Copyright 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000
  10    Free Software Foundation, Inc.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 59 Temple Place - Suite 330,
  25    Boston, MA 02111-1307, USA.  */
  26
  27 #if !defined (COMMAND_H)
  28 #define COMMAND_H 1
  29
  30 /* Command classes are top-level categories into which commands are broken
  31    down for "help" purposes.
  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, all_classes = -2, all_commands = -1,
  40   /* Classes of commands */
  41   no_class = -1, class_run = 0, class_vars, class_stack,
  42   class_files, class_support, class_info, class_breakpoint, class_trace,
  43   class_alias, class_obscure, class_user, class_maintenance,
  44   class_pseudo, class_tui, class_xdb
  45 };
  46
  47 /* Not a set/show command.  Note that some commands which begin with
  48    "set" or "show" might be in this category, if their syntax does
  49    not fall into one of the following categories.  */
  50 typedef enum cmd_types
  51   {
  52     not_set_cmd,
  53     set_cmd,
  54     show_cmd
  55   }
  56 cmd_types;
  57
  58 /* Reasonable values for an AUTO_BOOLEAN variable. */
  59 enum cmd_auto_boolean
  60 {
  61   CMD_AUTO_BOOLEAN_TRUE,
  62   CMD_AUTO_BOOLEAN_FALSE,
  63   CMD_AUTO_BOOLEAN_AUTO
  64 };
  65
  66 /* Types of "set" or "show" command.  */
  67 typedef enum var_types
  68   {
  69     /* "on" or "off".  *VAR is an integer which is nonzero for on,
  70        zero for off.  */
  71     var_boolean,
  72
  73     /* "on" / "true" / "enable" or "off" / "false" / "disable" or
  74        "auto.  *VAR is an ``enum cmd_auto_boolean''.  NOTE: In general
  75        a custom show command will need to be implemented - one that
  76        for "auto" prints both the "auto" and the current auto-selected
  77        value. */
  78     var_auto_boolean,
  79
  80     /* Unsigned Integer.  *VAR is an unsigned int.  The user can type 0
  81        to mean "unlimited", which is stored in *VAR as UINT_MAX.  */
  82     var_uinteger,
  83
  84     /* Like var_uinteger but signed.  *VAR is an int.  The user can type 0
  85        to mean "unlimited", which is stored in *VAR as INT_MAX.  */
  86     var_integer,
  87
  88     /* String which the user enters with escapes (e.g. the user types \n and
  89        it is a real newline in the stored string).
  90        *VAR is a malloc'd string, or NULL if the string is empty.  */
  91     var_string,
  92     /* String which stores what the user types verbatim.
  93        *VAR is a malloc'd string, or NULL if the string is empty.  */
  94     var_string_noescape,
  95     /* String which stores a filename.
  96        *VAR is a malloc'd string, or NULL if the string is empty.  */
  97     var_filename,
  98     /* ZeroableInteger.  *VAR is an int.  Like Unsigned Integer except
  99        that zero really means zero.  */
 100     var_zinteger,
 101     /* Enumerated type.  Can only have one of the specified values.  *VAR is a
 102        char pointer to the name of the element that we find.  */
 103     var_enum
 104   }
 105 var_types;
 106
 107 /* This structure records one command'd definition.  */
 108
 109
 110 /* This flag is used by the code executing commands to warn the user
 111    the first time a deprecated command is used, see the 'flags' field in
 112    the following struct.
 113 */
 114 #define CMD_DEPRECATED            0x1
 115 #define DEPRECATED_WARN_USER      0x2
 116 #define MALLOCED_REPLACEMENT      0x4
 117
 118 struct cmd_list_element
 119   {
 120     /* Points to next command in this list.  */
 121     struct cmd_list_element *next;
 122
 123     /* Name of this command.  */
 124     char *name;
 125
 126     /* Command class; class values are chosen by application program.  */
 127     enum command_class class;
 128
 129     /* Function definition of this command.
 130        NO_FUNCTION for command class names and for help topics that
 131        are not really commands.  */
 132     union
 133       {
 134         /* If type is not_set_cmd, call it like this:  */
 135         void (*cfunc) (char *args, int from_tty);
 136
 137         /* If type is set_cmd or show_cmd, first set the variables, and
 138            then call this.  */
 139         void (*sfunc) (char *args, int from_tty, struct cmd_list_element * c);
 140       }
 141     function;
 142 #define NO_FUNCTION ((void (*) (char *args, int from_tty)) 0)
 143
 144     /* Documentation of this command (or help topic).
 145        First line is brief documentation; remaining lines form, with it,
 146        the full documentation.  First line should end with a period.
 147        Entire string should also end with a period, not a newline.  */
 148     char *doc;
 149
 150     /* flags : a bitfield
 151
 152        bit 0: (LSB) CMD_DEPRECATED, when 1 indicated that this command
 153        is deprecated. It may be removed from gdb's command set in the
 154        future.
 155
 156        bit 1: DEPRECATED_WARN_USER, the user needs to be warned that
 157        this is a deprecated command.  The user should only be warned
 158        the first time a command is used.
 159
 160        bit 2: MALLOCED_REPLACEMENT, when functions are deprecated at
 161        compile time (this is the way it should, in general, be done)
 162        the memory containing the replacement string is statically
 163        allocated.  In some cases it makes sense to deprecate commands
 164        at runtime (the testsuite is one example).  In this case the
 165        memory for replacement is malloc'ed.  When a command is
 166        undeprecated or re-deprecated at runtime we don't want to risk
 167        calling free on statically allocated memory, so we check this
 168        flag.
 169      */
 170     int flags;
 171
 172     /* if this command is deprecated, this is the replacement name */
 173     char *replacement;
 174
 175     /* If this command represents a show command, then this function
 176        is called before the variable's value is examined.  */
 177     void (*pre_show_hook) (struct cmd_list_element *c);
 178
 179     /* Hook for another command to be executed before this command.  */
 180     struct cmd_list_element *hook_pre;
 181
 182     /* Hook for another command to be executed after this command.  */
 183     struct cmd_list_element *hook_post;
 184
 185     /* Flag that specifies if this command is already running it's hook. */
 186     /* Prevents the possibility of hook recursion. */
 187     int hook_in;
 188
 189     /* Nonzero identifies a prefix command.  For them, the address
 190        of the variable containing the list of subcommands.  */
 191     struct cmd_list_element **prefixlist;
 192
 193     /* For prefix commands only:
 194        String containing prefix commands to get here: this one
 195        plus any others needed to get to it.  Should end in a space.
 196        It is used before the word "command" in describing the
 197        commands reached through this prefix.  */
 198     char *prefixname;
 199
 200     /* For prefix commands only:
 201        nonzero means do not get an error if subcommand is not
 202        recognized; call the prefix's own function in that case.  */
 203     char allow_unknown;
 204
 205     /* Nonzero says this is an abbreviation, and should not
 206        be mentioned in lists of commands.
 207        This allows "br<tab>" to complete to "break", which it
 208        otherwise wouldn't.  */
 209     char abbrev_flag;
 210
 211     /* Completion routine for this command.  TEXT is the text beyond
 212        what was matched for the command itself (leading whitespace is
 213        skipped).  It stops where we are supposed to stop completing
 214        (rl_point) and is '\0' terminated.
 215
 216        Return value is a malloc'd vector of pointers to possible completions
 217        terminated with NULL.  If there are no completions, returning a pointer
 218        to a NULL would work but returning NULL itself is also valid.
 219        WORD points in the same buffer as TEXT, and completions should be
 220        returned relative to this position.  For example, suppose TEXT is "foo"
 221        and we want to complete to "foobar".  If WORD is "oo", return
 222        "oobar"; if WORD is "baz/foo", return "baz/foobar".  */
 223     char **(*completer) (char *text, char *word);
 224
 225     /* Type of "set" or "show" command (or SET_NOT_SET if not "set"
 226        or "show").  */
 227     cmd_types type;
 228
 229     /* Pointer to variable affected by "set" and "show".  Doesn't matter
 230        if type is not_set.  */
 231     void *var;
 232
 233     /* What kind of variable is *VAR?  */
 234     var_types var_type;
 235
 236     /* Pointer to NULL terminated list of enumerated values (like argv).  */
 237     const char **enums;
 238
 239     /* Pointer to command strings of user-defined commands */
 240     struct command_line *user_commands;
 241
 242     /* Pointer to command that is hooked by this one, (by hook_pre)
 243        so the hook can be removed when this one is deleted.  */
 244     struct cmd_list_element *hookee_pre;
 245
 246     /* Pointer to command that is hooked by this one, (by hook_post)
 247        so the hook can be removed when this one is deleted.  */
 248     struct cmd_list_element *hookee_post;
 249
 250     /* Pointer to command that is aliased by this one, so the
 251        aliased command can be located in case it has been hooked.  */
 252     struct cmd_list_element *cmd_pointer;
 253   };
 254
 255 /* Forward-declarations of the entry-points of command.c.  */
 256
 257 extern struct cmd_list_element *add_cmd (char *, enum command_class,
 258                                          void (*fun) (char *, int), char *,
 259                                          struct cmd_list_element **);
 260
 261 extern struct cmd_list_element *add_alias_cmd (char *, char *,
 262                                                enum command_class, int,
 263                                                struct cmd_list_element **);
 264
 265 extern struct cmd_list_element *add_prefix_cmd (char *, enum command_class,
 266                                                 void (*fun) (char *, int),
 267                                                 char *,
 268                                                 struct cmd_list_element **,
 269                                                 char *, int,
 270                                                 struct cmd_list_element **);
 271
 272 extern struct cmd_list_element *add_abbrev_prefix_cmd (char *,
 273                                                        enum command_class,
 274                                                        void (*fun) (char *,
 275                                                                     int),
 276                                                        char *,
 277                                                        struct cmd_list_element
 278                                                        **, char *, int,
 279                                                        struct cmd_list_element
 280                                                        **);
 281
 282 extern struct cmd_list_element *lookup_cmd (char **,
 283                                             struct cmd_list_element *, char *,
 284                                             int, int);
 285
 286 extern struct cmd_list_element *lookup_cmd_1 (char **,
 287                                               struct cmd_list_element *,
 288                                               struct cmd_list_element **,
 289                                               int);
 290
 291 extern struct cmd_list_element *
 292   deprecate_cmd (struct cmd_list_element *, char * );
 293
 294 extern void
 295   deprecated_cmd_warning (char **);
 296
 297 extern int
 298   lookup_cmd_composition (char *text,
 299                         struct cmd_list_element **alias,
 300                         struct cmd_list_element **prefix_cmd,
 301                         struct cmd_list_element **cmd);
 302
 303 extern struct cmd_list_element *add_com (char *, enum command_class,
 304                                          void (*fun) (char *, int), char *);
 305
 306 extern struct cmd_list_element *add_com_alias (char *, char *,
 307                                                enum command_class, int);
 308
 309 extern struct cmd_list_element *add_info (char *, void (*fun) (char *, int),
 310                                           char *);
 311
 312 extern struct cmd_list_element *add_info_alias (char *, char *, int);
 313
 314 extern char **complete_on_cmdlist (struct cmd_list_element *, char *, char *);
 315
 316 extern char **complete_on_enum (const char *enumlist[], char *, char *);
 317
 318 extern void delete_cmd (char *, struct cmd_list_element **);
 319
 320 extern void help_cmd (char *, struct ui_file *);
 321
 322 extern void help_list (struct cmd_list_element *, char *,
 323                        enum command_class, struct ui_file *);
 324
 325 extern void help_cmd_list (struct cmd_list_element *, enum command_class,
 326                            char *, int, struct ui_file *);
 327
 328 extern struct cmd_list_element *add_set_cmd (char *name, enum
 329                                              command_class class,
 330                                              var_types var_type, void *var,
 331                                              char *doc,
 332                                              struct cmd_list_element **list);
 333
 334 extern struct cmd_list_element *add_set_enum_cmd (char *name,
 335                                                   enum command_class class,
 336                                                   const char *enumlist[],
 337                                                   const char **var,
 338                                                   char *doc,
 339                                                   struct cmd_list_element **list);
 340
 341 extern struct cmd_list_element *add_set_auto_boolean_cmd (char *name,
 342                                                           enum command_class class,
 343                                                           enum cmd_auto_boolean *var,
 344                                                           char *doc,
 345                                                           struct cmd_list_element **list);
 346
 347 extern struct cmd_list_element *add_set_boolean_cmd (char *name,
 348                                                      enum command_class class,
 349                                                      int *var,
 350                                                      char *doc,
 351                                                      struct cmd_list_element **list);
 352
 353 extern struct cmd_list_element *add_show_from_set (struct cmd_list_element *,
 354                                                    struct cmd_list_element
 355                                                    **);
 356
 357 /* Do a "show" command for each thing on a command list.  */
 358
 359 extern void cmd_show_list (struct cmd_list_element *, int, char *);
 360
 361 extern NORETURN void error_no_arg (char *) ATTR_NORETURN;
 362
 363 extern void dont_repeat (void);
 364
 365 /* Used to mark commands that don't do anything.  If we just leave the
 366    function field NULL, the command is interpreted as a help topic, or
 367    as a class of commands.  */
 368
 369 extern void not_just_help_class_command (char *, int);
 370
 371 #endif /* !defined (COMMAND_H) */