gdb/cli/cli-decode.h

   1 /* Header file for GDB command decoding library.
   2
   3    Copyright (c) 2000, 2003, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #if !defined (CLI_DECODE_H)
  20 #define CLI_DECODE_H 1
  21
  22 #include "command.h"
  23
  24 struct re_pattern_buffer;
  25
  26 #if 0
  27 /* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
  28    cmd_types'' can be moved from "command.h" to "cli-decode.h".  */
  29 /* Not a set/show command.  Note that some commands which begin with
  30    "set" or "show" might be in this category, if their syntax does
  31    not fall into one of the following categories.  */
  32 typedef enum cmd_types
  33   {
  34     not_set_cmd,
  35     set_cmd,
  36     show_cmd
  37   }
  38 cmd_types;
  39 #endif
  40
  41 /* This structure records one command'd definition.  */
  42
  43
  44 /* This flag is used by the code executing commands to warn the user
  45    the first time a deprecated command is used, see the 'flags' field
  46    in the following struct.
  47 */
  48 #define CMD_DEPRECATED            0x1
  49 #define DEPRECATED_WARN_USER      0x2
  50 #define MALLOCED_REPLACEMENT      0x4
  51
  52 struct cmd_list_element
  53   {
  54     /* Points to next command in this list.  */
  55     struct cmd_list_element *next;
  56
  57     /* Name of this command.  */
  58     char *name;
  59
  60     /* Command class; class values are chosen by application program.  */
  61     enum command_class class;
  62
  63     /* Function definition of this command.  NULL for command class
  64        names and for help topics that are not really commands.  NOTE:
  65        cagney/2002-02-02: This function signature is evolving.  For
  66        the moment suggest sticking with either set_cmd_cfunc() or
  67        set_cmd_sfunc().  */
  68     void (*func) (struct cmd_list_element *c, char *args, int from_tty);
  69     /* The command's real callback.  At present func() bounces through
  70        to one of the below.  */
  71     union
  72       {
  73         /* If type is not_set_cmd, call it like this: */
  74         cmd_cfunc_ftype *cfunc;
  75         /* If type is set_cmd or show_cmd, first set the variables,
  76            and then call this: */
  77         cmd_sfunc_ftype *sfunc;
  78       }
  79     function;
  80
  81     /* Local state (context) for this command.  This can be anything.  */
  82     void *context;
  83
  84     /* Documentation of this command (or help topic).
  85        First line is brief documentation; remaining lines form, with it,
  86        the full documentation.  First line should end with a period.
  87        Entire string should also end with a period, not a newline.  */
  88     char *doc;
  89
  90     /* For set/show commands.  A method for printing the output to the
  91        specified stream.  */
  92     show_value_ftype *show_value_func;
  93
  94     /* flags : a bitfield
  95
  96        bit 0: (LSB) CMD_DEPRECATED, when 1 indicated that this command
  97        is deprecated.  It may be removed from gdb's command set in the
  98        future.
  99
 100        bit 1: DEPRECATED_WARN_USER, the user needs to be warned that
 101        this is a deprecated command.  The user should only be warned
 102        the first time a command is used.
 103
 104        bit 2: MALLOCED_REPLACEMENT, when functions are deprecated at
 105        compile time (this is the way it should, in general, be done)
 106        the memory containing the replacement string is statically
 107        allocated.  In some cases it makes sense to deprecate commands
 108        at runtime (the testsuite is one example).  In this case the
 109        memory for replacement is malloc'ed.  When a command is
 110        undeprecated or re-deprecated at runtime we don't want to risk
 111        calling free on statically allocated memory, so we check this
 112        flag.  */
 113
 114     int flags;
 115
 116     /* If this command is deprecated, this is the replacement name.  */
 117     char *replacement;
 118
 119     /* If this command represents a show command, then this function
 120        is called before the variable's value is examined.  */
 121     void (*pre_show_hook) (struct cmd_list_element *c);
 122
 123     /* Hook for another command to be executed before this command.  */
 124     struct cmd_list_element *hook_pre;
 125
 126     /* Hook for another command to be executed after this command.  */
 127     struct cmd_list_element *hook_post;
 128
 129     /* Flag that specifies if this command is already running its hook.  */
 130     /* Prevents the possibility of hook recursion.  */
 131     int hook_in;
 132
 133     /* Nonzero identifies a prefix command.  For them, the address
 134        of the variable containing the list of subcommands.  */
 135     struct cmd_list_element **prefixlist;
 136
 137     /* For prefix commands only:
 138        String containing prefix commands to get here: this one
 139        plus any others needed to get to it.  Should end in a space.
 140        It is used before the word "command" in describing the
 141        commands reached through this prefix.  */
 142     char *prefixname;
 143
 144     /* For prefix commands only:
 145        nonzero means do not get an error if subcommand is not
 146        recognized; call the prefix's own function in that case.  */
 147     char allow_unknown;
 148
 149     /* Nonzero says this is an abbreviation, and should not
 150        be mentioned in lists of commands.
 151        This allows "br<tab>" to complete to "break", which it
 152        otherwise wouldn't.  */
 153     char abbrev_flag;
 154
 155     /* Completion routine for this command.  TEXT is the text beyond
 156        what was matched for the command itself (leading whitespace is
 157        skipped).  It stops where we are supposed to stop completing
 158        (rl_point) and is '\0' terminated.
 159
 160        Return value is a malloc'd vector of pointers to possible
 161        completions terminated with NULL.  If there are no completions,
 162        returning a pointer to a NULL would work but returning NULL
 163        itself is also valid.  WORD points in the same buffer as TEXT,
 164        and completions should be returned relative to this position.
 165        For example, suppose TEXT is "foo" and we want to complete to
 166        "foobar".  If WORD is "oo", return "oobar"; if WORD is
 167        "baz/foo", return "baz/foobar".  */
 168     char **(*completer) (struct cmd_list_element *cmd,
 169                          char *text, char *word);
 170
 171     /* Destruction routine for this command.  If non-NULL, this is
 172        called when this command instance is destroyed.  This may be
 173        used to finalize the CONTEXT field, if needed.  */
 174     void (*destroyer) (struct cmd_list_element *self, void *context);
 175
 176     /* Type of "set" or "show" command (or SET_NOT_SET if not "set"
 177        or "show").  */
 178     cmd_types type;
 179
 180     /* Pointer to variable affected by "set" and "show".  Doesn't
 181        matter if type is not_set.  */
 182     void *var;
 183
 184     /* What kind of variable is *VAR?  */
 185     var_types var_type;
 186
 187     /* Pointer to NULL terminated list of enumerated values (like
 188        argv).  */
 189     const char **enums;
 190
 191     /* Pointer to command strings of user-defined commands */
 192     struct command_line *user_commands;
 193
 194     /* Pointer to command that is hooked by this one, (by hook_pre)
 195        so the hook can be removed when this one is deleted.  */
 196     struct cmd_list_element *hookee_pre;
 197
 198     /* Pointer to command that is hooked by this one, (by hook_post)
 199        so the hook can be removed when this one is deleted.  */
 200     struct cmd_list_element *hookee_post;
 201
 202     /* Pointer to command that is aliased by this one, so the
 203        aliased command can be located in case it has been hooked.  */
 204     struct cmd_list_element *cmd_pointer;
 205
 206     /* Start of a linked list of all aliases of this command.  */
 207     struct cmd_list_element *aliases;
 208
 209     /* Link pointer for aliases on an alias list.  */
 210     struct cmd_list_element *alias_chain;
 211   };
 212
 213 /* API to the manipulation of command lists.  */
 214
 215 extern struct cmd_list_element *add_cmd (char *, enum command_class,
 216                                          void (*fun) (char *, int), char *,
 217                                          struct cmd_list_element **);
 218
 219 extern struct cmd_list_element *add_alias_cmd (char *, char *,
 220                                                enum command_class, int,
 221                                                struct cmd_list_element **);
 222
 223 extern struct cmd_list_element *add_prefix_cmd (char *, enum command_class,
 224                                                 void (*fun) (char *, int),
 225                                                 char *,
 226                                                 struct cmd_list_element **,
 227                                                 char *, int,
 228                                                 struct cmd_list_element **);
 229
 230 extern struct cmd_list_element *add_abbrev_prefix_cmd (char *,
 231                                                        enum command_class,
 232                                                        void (*fun) (char *,
 233                                                                     int),
 234                                                        char *,
 235                                                        struct cmd_list_element
 236                                                        **, char *, int,
 237                                                        struct cmd_list_element
 238                                                        **);
 239
 240 /* Set the commands corresponding callback.  */
 241
 242 extern void set_cmd_cfunc (struct cmd_list_element *cmd,
 243                            void (*cfunc) (char *args, int from_tty));
 244
 245 extern void set_cmd_sfunc (struct cmd_list_element *cmd,
 246                            void (*sfunc) (char *args, int from_tty,
 247                                           struct cmd_list_element * c));
 248
 249 extern void set_cmd_completer (struct cmd_list_element *cmd,
 250                                char **(*completer) (struct cmd_list_element *self,
 251                                                     char *text, char *word));
 252
 253 /* HACK: cagney/2002-02-23: Code, mostly in tracepoints.c, grubs
 254    around in cmd objects to test the value of the commands sfunc().  */
 255 extern int cmd_cfunc_eq (struct cmd_list_element *cmd,
 256                          void (*cfunc) (char *args, int from_tty));
 257
 258 /* Access to the command's local context.  */
 259 extern void set_cmd_context (struct cmd_list_element *cmd, void *context);
 260 extern void *get_cmd_context (struct cmd_list_element *cmd);
 261
 262 extern struct cmd_list_element *lookup_cmd (char **,
 263                                             struct cmd_list_element *, char *,
 264                                             int, int);
 265
 266 extern struct cmd_list_element *lookup_cmd_1 (char **,
 267                                               struct cmd_list_element *,
 268                                               struct cmd_list_element **,
 269                                               int);
 270
 271 extern struct cmd_list_element *
 272   deprecate_cmd (struct cmd_list_element *, char * );
 273
 274 extern void
 275   deprecated_cmd_warning (char **);
 276
 277 extern int
 278   lookup_cmd_composition (char *text,
 279                         struct cmd_list_element **alias,
 280                         struct cmd_list_element **prefix_cmd,
 281                         struct cmd_list_element **cmd);
 282
 283 extern struct cmd_list_element *add_com (char *, enum command_class,
 284                                          void (*fun) (char *, int), char *);
 285
 286 extern struct cmd_list_element *add_com_alias (char *, char *,
 287                                                enum command_class, int);
 288
 289 extern struct cmd_list_element *add_info (char *, void (*fun) (char *, int),
 290                                           char *);
 291
 292 extern struct cmd_list_element *add_info_alias (char *, char *, int);
 293
 294 extern char **complete_on_cmdlist (struct cmd_list_element *, char *, char *);
 295
 296 extern char **complete_on_enum (const char *enumlist[], char *, char *);
 297
 298 extern void help_cmd_list (struct cmd_list_element *, enum command_class,
 299                            char *, int, struct ui_file *);
 300
 301 /* Functions that implement commands about CLI commands.  */
 302
 303 extern void help_cmd (char *, struct ui_file *);
 304
 305 extern void help_list (struct cmd_list_element *, char *,
 306                        enum command_class, struct ui_file *);
 307
 308 extern void apropos_cmd (struct ui_file *, struct cmd_list_element *,
 309                          struct re_pattern_buffer *, char *);
 310
 311 /* Used to mark commands that don't do anything.  If we just leave the
 312    function field NULL, the command is interpreted as a help topic, or
 313    as a class of commands.  */
 314
 315 extern void not_just_help_class_command (char *arg, int from_tty);
 316
 317 /* Exported to cli/cli-setshow.c */
 318
 319 extern void print_doc_line (struct ui_file *, char *);
 320
 321
 322 #endif /* !defined (CLI_DECODE_H) */