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 cmd_set 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     /* Hook for another command to be executed before this command.  */
 176     struct cmd_list_element *hook_pre;
 177
 178     /* Hook for another command to be executed after this command.  */
 179     struct cmd_list_element *hook_post;
 180
 181     /* Flag that specifies if this command is already running it's hook. */
 182     /* Prevents the possibility of hook recursion. */
 183     int hook_in;
 184
 185     /* Nonzero identifies a prefix command.  For them, the address
 186        of the variable containing the list of subcommands.  */
 187     struct cmd_list_element **prefixlist;
 188
 189     /* For prefix commands only:
 190        String containing prefix commands to get here: this one
 191        plus any others needed to get to it.  Should end in a space.
 192        It is used before the word "command" in describing the
 193        commands reached through this prefix.  */
 194     char *prefixname;
 195
 196     /* For prefix commands only:
 197        nonzero means do not get an error if subcommand is not
 198        recognized; call the prefix's own function in that case.  */
 199     char allow_unknown;
 200
 201     /* Nonzero says this is an abbreviation, and should not
 202        be mentioned in lists of commands.
 203        This allows "br<tab>" to complete to "break", which it
 204        otherwise wouldn't.  */
 205     char abbrev_flag;
 206
 207     /* Completion routine for this command.  TEXT is the text beyond
 208        what was matched for the command itself (leading whitespace is
 209        skipped).  It stops where we are supposed to stop completing
 210        (rl_point) and is '\0' terminated.
 211
 212        Return value is a malloc'd vector of pointers to possible completions
 213        terminated with NULL.  If there are no completions, returning a pointer
 214        to a NULL would work but returning NULL itself is also valid.
 215        WORD points in the same buffer as TEXT, and completions should be
 216        returned relative to this position.  For example, suppose TEXT is "foo"
 217        and we want to complete to "foobar".  If WORD is "oo", return
 218        "oobar"; if WORD is "baz/foo", return "baz/foobar".  */
 219     char **(*completer) (char *text, char *word);
 220
 221     /* Type of "set" or "show" command (or SET_NOT_SET if not "set"
 222        or "show").  */
 223     cmd_types type;
 224
 225     /* Pointer to variable affected by "set" and "show".  Doesn't matter
 226        if type is not_set.  */
 227     void *var;
 228
 229     /* What kind of variable is *VAR?  */
 230     var_types var_type;
 231
 232     /* Pointer to NULL terminated list of enumerated values (like argv).  */
 233     const char **enums;
 234
 235     /* Pointer to command strings of user-defined commands */
 236     struct command_line *user_commands;
 237
 238     /* Pointer to command that is hooked by this one, (by hook_pre)
 239        so the hook can be removed when this one is deleted.  */
 240     struct cmd_list_element *hookee_pre;
 241
 242     /* Pointer to command that is hooked by this one, (by hook_post)
 243        so the hook can be removed when this one is deleted.  */
 244     struct cmd_list_element *hookee_post;
 245
 246     /* Pointer to command that is aliased by this one, so the
 247        aliased command can be located in case it has been hooked.  */
 248     struct cmd_list_element *cmd_pointer;
 249   };
 250
 251 /* Forward-declarations of the entry-points of command.c.  */
 252
 253 extern struct cmd_list_element *add_cmd (char *, enum command_class,
 254                                          void (*fun) (char *, int), char *,
 255                                          struct cmd_list_element **);
 256
 257 extern struct cmd_list_element *add_alias_cmd (char *, char *,
 258                                                enum command_class, int,
 259                                                struct cmd_list_element **);
 260
 261 extern struct cmd_list_element *add_prefix_cmd (char *, enum command_class,
 262                                                 void (*fun) (char *, int),
 263                                                 char *,
 264                                                 struct cmd_list_element **,
 265                                                 char *, int,
 266                                                 struct cmd_list_element **);
 267
 268 extern struct cmd_list_element *add_abbrev_prefix_cmd (char *,
 269                                                        enum command_class,
 270                                                        void (*fun) (char *,
 271                                                                     int),
 272                                                        char *,
 273                                                        struct cmd_list_element
 274                                                        **, char *, int,
 275                                                        struct cmd_list_element
 276                                                        **);
 277
 278 extern struct cmd_list_element *lookup_cmd (char **,
 279                                             struct cmd_list_element *, char *,
 280                                             int, int);
 281
 282 extern struct cmd_list_element *lookup_cmd_1 (char **,
 283                                               struct cmd_list_element *,
 284                                               struct cmd_list_element **,
 285                                               int);
 286
 287 extern struct cmd_list_element *
 288   deprecate_cmd (struct cmd_list_element *, char * );
 289
 290 extern void
 291   deprecated_cmd_warning (char **);
 292
 293 extern int
 294   lookup_cmd_composition (char *text,
 295                         struct cmd_list_element **alias,
 296                         struct cmd_list_element **prefix_cmd,
 297                         struct cmd_list_element **cmd);
 298
 299 extern struct cmd_list_element *add_com (char *, enum command_class,
 300                                          void (*fun) (char *, int), char *);
 301
 302 extern struct cmd_list_element *add_com_alias (char *, char *,
 303                                                enum command_class, int);
 304
 305 extern struct cmd_list_element *add_info (char *, void (*fun) (char *, int),
 306                                           char *);
 307
 308 extern struct cmd_list_element *add_info_alias (char *, char *, int);
 309
 310 extern char **complete_on_cmdlist (struct cmd_list_element *, char *, char *);
 311
 312 extern char **complete_on_enum (const char *enumlist[], char *, char *);
 313
 314 extern void delete_cmd (char *, struct cmd_list_element **);
 315
 316 extern void help_cmd (char *, struct ui_file *);
 317
 318 extern void help_list (struct cmd_list_element *, char *,
 319                        enum command_class, struct ui_file *);
 320
 321 extern void help_cmd_list (struct cmd_list_element *, enum command_class,
 322                            char *, int, struct ui_file *);
 323
 324 extern struct cmd_list_element *add_set_cmd (char *name, enum
 325                                              command_class class,
 326                                              var_types var_type, void *var,
 327                                              char *doc,
 328                                              struct cmd_list_element **list);
 329
 330 extern struct cmd_list_element *add_set_enum_cmd (char *name,
 331                                                   enum command_class class,
 332                                                   const char *enumlist[],
 333                                                   const char **var,
 334                                                   char *doc,
 335                                                   struct cmd_list_element **list);
 336
 337 extern struct cmd_list_element *add_set_auto_boolean_cmd (char *name,
 338                                                           enum command_class class,
 339                                                           enum cmd_auto_boolean *var,
 340                                                           char *doc,
 341                                                           struct cmd_list_element **list);
 342
 343 extern struct cmd_list_element *add_set_boolean_cmd (char *name,
 344                                                      enum command_class class,
 345                                                      int *var,
 346                                                      char *doc,
 347                                                      struct cmd_list_element **list);
 348
 349 extern struct cmd_list_element *add_show_from_set (struct cmd_list_element *,
 350                                                    struct cmd_list_element
 351                                                    **);
 352
 353 /* Do a "show" command for each thing on a command list.  */
 354
 355 extern void cmd_show_list (struct cmd_list_element *, int, char *);
 356
 357 extern NORETURN void error_no_arg (char *) ATTR_NORETURN;
 358
 359 extern void dont_repeat (void);
 360
 361 /* Used to mark commands that don't do anything.  If we just leave the
 362    function field NULL, the command is interpreted as a help topic, or
 363    as a class of commands.  */
 364
 365 extern void not_just_help_class_command (char *, int);
 366
 367 #endif /* !defined (COMMAND_H) */