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 (C) 1986, 1989, 1990, 2000 Free Software Foundation, Inc.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 59 Temple Place - Suite 330,
  24    Boston, MA 02111-1307, USA.  */
  25
  26 #if !defined (COMMAND_H)
  27 #define COMMAND_H 1
  28
  29 /* Command classes are top-level categories into which commands are broken
  30    down for "help" purposes.
  31    Notes on classes: class_alias is for alias commands which are not
  32    abbreviations of the original command.  class-pseudo is for
  33    commands which are not really commands nor help topics ("stop").  */
  34
  35 enum command_class
  36 {
  37   /* Special args to help_list */
  38   class_deprecated, all_classes = -2, all_commands = -1,
  39   /* Classes of commands */
  40   no_class = -1, class_run = 0, class_vars, class_stack,
  41   class_files, class_support, class_info, class_breakpoint, class_trace,
  42   class_alias, class_obscure, class_user, class_maintenance,
  43   class_pseudo, class_tui, class_xdb
  44 };
  45
  46 /* Not a set/show command.  Note that some commands which begin with
  47    "set" or "show" might be in this category, if their syntax does
  48    not fall into one of the following categories.  */
  49 typedef enum cmd_types
  50   {
  51     not_set_cmd,
  52     set_cmd,
  53     show_cmd
  54   }
  55 cmd_types;
  56
  57 /* Reasonable values for an AUTO_BOOLEAN variable. */
  58 enum cmd_auto_boolean
  59 {
  60   CMD_AUTO_BOOLEAN_TRUE,
  61   CMD_AUTO_BOOLEAN_FALSE,
  62   CMD_AUTO_BOOLEAN_AUTO
  63 };
  64
  65 /* Types of "set" or "show" command.  */
  66 typedef enum var_types
  67   {
  68     /* "on" or "off".  *VAR is an integer which is nonzero for on,
  69        zero for off.  */
  70     var_boolean,
  71
  72     /* "on" / "true" / "enable" or "off" / "false" / "disable" or
  73        "auto.  *VAR is an ``enum cmd_auto_boolean''.  NOTE: In general
  74        a custom show command will need to be implemented - one that
  75        for "auto" prints both the "auto" and the current auto-selected
  76        value. */
  77     var_auto_boolean,
  78
  79     /* Unsigned Integer.  *VAR is an unsigned int.  The user can type 0
  80        to mean "unlimited", which is stored in *VAR as UINT_MAX.  */
  81     var_uinteger,
  82
  83     /* Like var_uinteger but signed.  *VAR is an int.  The user can type 0
  84        to mean "unlimited", which is stored in *VAR as INT_MAX.  */
  85     var_integer,
  86
  87     /* String which the user enters with escapes (e.g. the user types \n and
  88        it is a real newline in the stored string).
  89        *VAR is a malloc'd string, or NULL if the string is empty.  */
  90     var_string,
  91     /* String which stores what the user types verbatim.
  92        *VAR is a malloc'd string, or NULL if the string is empty.  */
  93     var_string_noescape,
  94     /* String which stores a filename.
  95        *VAR is a malloc'd string, or NULL if the string is empty.  */
  96     var_filename,
  97     /* ZeroableInteger.  *VAR is an int.  Like Unsigned Integer except
  98        that zero really means zero.  */
  99     var_zinteger,
 100     /* Enumerated type.  Can only have one of the specified values.  *VAR is a
 101        char pointer to the name of the element that we find.  */
 102     var_enum
 103   }
 104 var_types;
 105
 106 /* This structure records one command'd definition.  */
 107
 108
 109 /* This flag is used by the code executing commands to warn the user
 110    the first time a deprecated command is used, see the 'flags' field in
 111    the following struct.
 112 */
 113 #define CMD_DEPRECATED            0x1
 114 #define DEPRECATED_WARN_USER      0x2
 115 #define MALLOCED_REPLACEMENT      0x4
 116
 117 struct cmd_list_element
 118   {
 119     /* Points to next command in this list.  */
 120     struct cmd_list_element *next;
 121
 122     /* Name of this command.  */
 123     char *name;
 124
 125     /* Command class; class values are chosen by application program.  */
 126     enum command_class class;
 127
 128     /* Function definition of this command.
 129        NO_FUNCTION for command class names and for help topics that
 130        are not really commands.  */
 131     union
 132       {
 133         /* If type is not_set_cmd, call it like this:  */
 134         void (*cfunc) (char *args, int from_tty);
 135
 136         /* If type is cmd_set or show_cmd, first set the variables, and
 137            then call this.  */
 138         void (*sfunc) (char *args, int from_tty, struct cmd_list_element * c);
 139       }
 140     function;
 141 #define NO_FUNCTION ((void (*) (char *args, int from_tty)) 0)
 142
 143     /* Documentation of this command (or help topic).
 144        First line is brief documentation; remaining lines form, with it,
 145        the full documentation.  First line should end with a period.
 146        Entire string should also end with a period, not a newline.  */
 147     char *doc;
 148
 149     /* flags : a bitfield
 150
 151        bit 0: (LSB) CMD_DEPRECATED, when 1 indicated that this command
 152        is deprecated. It may be removed from gdb's command set in the
 153        future.
 154
 155        bit 1: DEPRECATED_WARN_USER, the user needs to be warned that
 156        this is a deprecated command.  The user should only be warned
 157        the first time a command is used.
 158
 159        bit 2: MALLOCED_REPLACEMENT, when functions are deprecated at
 160        compile time (this is the way it should, in general, be done)
 161        the memory containing the replacement string is statically
 162        allocated.  In some cases it makes sense to deprecate commands
 163        at runtime (the testsuite is one example).  In this case the
 164        memory for replacement is malloc'ed.  When a command is
 165        undeprecated or re-deprecated at runtime we don't want to risk
 166        calling free on statically allocated memory, so we check this
 167        flag.
 168      */
 169     int flags;
 170
 171     /* if this command is deprecated, this is the replacement name */
 172     char *replacement;
 173
 174     /* Hook for another command to be executed before this command.  */
 175     struct cmd_list_element *hook_pre;
 176
 177     /* Hook for another command to be executed after this command.  */
 178     struct cmd_list_element *hook_post;
 179
 180     /* Flag that specifies if this command is already running it's hook. */
 181     /* Prevents the possibility of hook recursion. */
 182     int hook_in;
 183
 184     /* Nonzero identifies a prefix command.  For them, the address
 185        of the variable containing the list of subcommands.  */
 186     struct cmd_list_element **prefixlist;
 187
 188     /* For prefix commands only:
 189        String containing prefix commands to get here: this one
 190        plus any others needed to get to it.  Should end in a space.
 191        It is used before the word "command" in describing the
 192        commands reached through this prefix.  */
 193     char *prefixname;
 194
 195     /* For prefix commands only:
 196        nonzero means do not get an error if subcommand is not
 197        recognized; call the prefix's own function in that case.  */
 198     char allow_unknown;
 199
 200     /* Nonzero says this is an abbreviation, and should not
 201        be mentioned in lists of commands.
 202        This allows "br<tab>" to complete to "break", which it
 203        otherwise wouldn't.  */
 204     char abbrev_flag;
 205
 206     /* Completion routine for this command.  TEXT is the text beyond
 207        what was matched for the command itself (leading whitespace is
 208        skipped).  It stops where we are supposed to stop completing
 209        (rl_point) and is '\0' terminated.
 210
 211        Return value is a malloc'd vector of pointers to possible completions
 212        terminated with NULL.  If there are no completions, returning a pointer
 213        to a NULL would work but returning NULL itself is also valid.
 214        WORD points in the same buffer as TEXT, and completions should be
 215        returned relative to this position.  For example, suppose TEXT is "foo"
 216        and we want to complete to "foobar".  If WORD is "oo", return
 217        "oobar"; if WORD is "baz/foo", return "baz/foobar".  */
 218     char **(*completer) (char *text, char *word);
 219
 220     /* Type of "set" or "show" command (or SET_NOT_SET if not "set"
 221        or "show").  */
 222     cmd_types type;
 223
 224     /* Pointer to variable affected by "set" and "show".  Doesn't matter
 225        if type is not_set.  */
 226     void *var;
 227
 228     /* What kind of variable is *VAR?  */
 229     var_types var_type;
 230
 231     /* Pointer to NULL terminated list of enumerated values (like argv).  */
 232     const char **enums;
 233
 234     /* Pointer to command strings of user-defined commands */
 235     struct command_line *user_commands;
 236
 237     /* Pointer to command that is hooked by this one, (by hook_pre)
 238        so the hook can be removed when this one is deleted.  */
 239     struct cmd_list_element *hookee_pre;
 240
 241     /* Pointer to command that is hooked by this one, (by hook_post)
 242        so the hook can be removed when this one is deleted.  */
 243     struct cmd_list_element *hookee_post;
 244
 245     /* Pointer to command that is aliased by this one, so the
 246        aliased command can be located in case it has been hooked.  */
 247     struct cmd_list_element *cmd_pointer;
 248   };
 249
 250 /* Forward-declarations of the entry-points of command.c.  */
 251
 252 extern struct cmd_list_element *add_cmd (char *, enum command_class,
 253                                          void (*fun) (char *, int), char *,
 254                                          struct cmd_list_element **);
 255
 256 extern struct cmd_list_element *add_alias_cmd (char *, char *,
 257                                                enum command_class, int,
 258                                                struct cmd_list_element **);
 259
 260 extern struct cmd_list_element *add_prefix_cmd (char *, enum command_class,
 261                                                 void (*fun) (char *, int),
 262                                                 char *,
 263                                                 struct cmd_list_element **,
 264                                                 char *, int,
 265                                                 struct cmd_list_element **);
 266
 267 extern struct cmd_list_element *add_abbrev_prefix_cmd (char *,
 268                                                        enum command_class,
 269                                                        void (*fun) (char *,
 270                                                                     int),
 271                                                        char *,
 272                                                        struct cmd_list_element
 273                                                        **, char *, int,
 274                                                        struct cmd_list_element
 275                                                        **);
 276
 277 extern struct cmd_list_element *lookup_cmd (char **,
 278                                             struct cmd_list_element *, char *,
 279                                             int, int);
 280
 281 extern struct cmd_list_element *lookup_cmd_1 (char **,
 282                                               struct cmd_list_element *,
 283                                               struct cmd_list_element **,
 284                                               int);
 285
 286 extern struct cmd_list_element *
 287   deprecate_cmd (struct cmd_list_element *, char * );
 288
 289 extern void
 290   deprecated_cmd_warning (char **);
 291
 292 extern int
 293   lookup_cmd_composition (char *text,
 294                         struct cmd_list_element **alias,
 295                         struct cmd_list_element **prefix_cmd,
 296                         struct cmd_list_element **cmd);
 297
 298 extern struct cmd_list_element *add_com (char *, enum command_class,
 299                                          void (*fun) (char *, int), char *);
 300
 301 extern struct cmd_list_element *add_com_alias (char *, char *,
 302                                                enum command_class, int);
 303
 304 extern struct cmd_list_element *add_info (char *, void (*fun) (char *, int),
 305                                           char *);
 306
 307 extern struct cmd_list_element *add_info_alias (char *, char *, int);
 308
 309 extern char **complete_on_cmdlist (struct cmd_list_element *, char *, char *);
 310
 311 extern char **complete_on_enum (const char *enumlist[], char *, char *);
 312
 313 extern void delete_cmd (char *, struct cmd_list_element **);
 314
 315 extern void help_cmd (char *, struct ui_file *);
 316
 317 extern void help_list (struct cmd_list_element *, char *,
 318                        enum command_class, struct ui_file *);
 319
 320 extern void help_cmd_list (struct cmd_list_element *, enum command_class,
 321                            char *, int, struct ui_file *);
 322
 323 extern struct cmd_list_element *add_set_cmd (char *name, enum
 324                                              command_class class,
 325                                              var_types var_type, void *var,
 326                                              char *doc,
 327                                              struct cmd_list_element **list);
 328
 329 extern struct cmd_list_element *add_set_enum_cmd (char *name,
 330                                                   enum command_class class,
 331                                                   const char *enumlist[],
 332                                                   const char **var,
 333                                                   char *doc,
 334                                                   struct cmd_list_element **list);
 335
 336 extern struct cmd_list_element *add_set_auto_boolean_cmd (char *name,
 337                                                           enum command_class class,
 338                                                           enum cmd_auto_boolean *var,
 339                                                           char *doc,
 340                                                           struct cmd_list_element **list);
 341
 342 extern struct cmd_list_element *add_show_from_set (struct cmd_list_element *,
 343                                                    struct cmd_list_element
 344                                                    **);
 345
 346 /* Do a "set" or "show" command.  ARG is NULL if no argument, or the text
 347    of the argument, and FROM_TTY is nonzero if this command is being entered
 348    directly by the user (i.e. these are just like any other
 349    command).  C is the command list element for the command.  */
 350
 351 extern void do_setshow_command (char *, int, struct cmd_list_element *);
 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) */