gdb/cli/cli-decode.h

   1 /* Header file for GDB command decoding library.
   2
   3    Copyright (C) 2000-2014 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 (CLI_DECODE_H)
  19 #define CLI_DECODE_H 1
  20
  21 /* This file defines the private interfaces for any code implementing
  22    command internals.  */
  23
  24 /* Include the public interfaces.  */
  25 #include "command.h"
  26
  27 struct re_pattern_buffer;
  28
  29 #if 0
  30 /* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
  31    cmd_types'' can be moved from "command.h" to "cli-decode.h".  */
  32 /* Not a set/show command.  Note that some commands which begin with
  33    "set" or "show" might be in this category, if their syntax does
  34    not fall into one of the following categories.  */
  35 typedef enum cmd_types
  36   {
  37     not_set_cmd,
  38     set_cmd,
  39     show_cmd
  40   }
  41 cmd_types;
  42 #endif
  43
  44 /* This structure records one command'd definition.  */
  45
  46
  47 struct cmd_list_element
  48   {
  49     /* Points to next command in this list.  */
  50     struct cmd_list_element *next;
  51
  52     /* Name of this command.  */
  53     const char *name;
  54
  55     /* Command class; class values are chosen by application program.  */
  56     enum command_class class;
  57
  58     /* Function definition of this command.  NULL for command class
  59        names and for help topics that are not really commands.  NOTE:
  60        cagney/2002-02-02: This function signature is evolving.  For
  61        the moment suggest sticking with either set_cmd_cfunc() or
  62        set_cmd_sfunc().  */
  63     void (*func) (struct cmd_list_element *c, char *args, int from_tty);
  64     /* The command's real callback.  At present func() bounces through
  65        to one of the below.  */
  66     union
  67       {
  68         /* If type is not_set_cmd, call it like this: */
  69         cmd_cfunc_ftype *cfunc;
  70         /* If type is set_cmd or show_cmd, first set the variables,
  71            and then call this: */
  72         cmd_sfunc_ftype *sfunc;
  73       }
  74     function;
  75
  76     /* Local state (context) for this command.  This can be anything.  */
  77     void *context;
  78
  79     /* Documentation of this command (or help topic).
  80        First line is brief documentation; remaining lines form, with it,
  81        the full documentation.  First line should end with a period.
  82        Entire string should also end with a period, not a newline.  */
  83     char *doc;
  84
  85     /* For set/show commands.  A method for printing the output to the
  86        specified stream.  */
  87     show_value_ftype *show_value_func;
  88
  89     /* When 1 indicated that this command is deprecated.  It may be
  90        removed from gdb's command set in the future.  */
  91
  92     unsigned int cmd_deprecated : 1;
  93
  94     /* The user needs to be warned that this is a deprecated command.
  95        The user should only be warned the first time a command is
  96        used.  */
  97
  98     unsigned int deprecated_warn_user : 1;
  99
 100     /* When functions are deprecated at compile time (this is the way
 101        it should, in general, be done) the memory containing the
 102        replacement string is statically allocated.  In some cases it
 103        makes sense to deprecate commands at runtime (the testsuite is
 104        one example).  In this case the memory for replacement is
 105        malloc'ed.  When a command is undeprecated or re-deprecated at
 106        runtime we don't want to risk calling free on statically
 107        allocated memory, so we check this flag.  */
 108
 109     unsigned int malloced_replacement : 1;
 110
 111     /* Set if the doc field should be xfree'd.  */
 112
 113     unsigned int doc_allocated : 1;
 114
 115     /* If this command is deprecated, this is the replacement name.  */
 116     char *replacement;
 117
 118     /* If this command represents a show command, then this function
 119        is called before the variable's value is examined.  */
 120     void (*pre_show_hook) (struct cmd_list_element *c);
 121
 122     /* Hook for another command to be executed before this command.  */
 123     struct cmd_list_element *hook_pre;
 124
 125     /* Flag that specifies if this command is already running its hook.  */
 126     /* Prevents the possibility of hook recursion.  */
 127     unsigned int hook_in : 1;
 128
 129     /* Hook for another command to be executed after this command.  */
 130     struct cmd_list_element *hook_post;
 131
 132     /* Nonzero identifies a prefix command.  For them, the address
 133        of the variable containing the list of subcommands.  */
 134     struct cmd_list_element **prefixlist;
 135
 136     /* For prefix commands only:
 137        String containing prefix commands to get here: this one
 138        plus any others needed to get to it.  Should end in a space.
 139        It is used before the word "command" in describing the
 140        commands reached through this prefix.  */
 141     char *prefixname;
 142
 143     /* For prefix commands only:
 144        nonzero means do not get an error if subcommand is not
 145        recognized; call the prefix's own function in that case.  */
 146     unsigned int allow_unknown : 1;
 147
 148     /* The prefix command of this command.  */
 149     struct cmd_list_element *prefix;
 150
 151     /* Nonzero says this is an abbreviation, and should not
 152        be mentioned in lists of commands.
 153        This allows "br<tab>" to complete to "break", which it
 154        otherwise wouldn't.  */
 155     unsigned int abbrev_flag : 1;
 156
 157     /* Completion routine for this command.  TEXT is the text beyond
 158        what was matched for the command itself (leading whitespace is
 159        skipped).  It stops where we are supposed to stop completing
 160        (rl_point) and is '\0' terminated.
 161
 162        Return value is a malloc'd vector of pointers to possible
 163        completions terminated with NULL.  If there are no completions,
 164        returning a pointer to a NULL would work but returning NULL
 165        itself is also valid.  WORD points in the same buffer as TEXT,
 166        and completions should be returned relative to this position.
 167        For example, suppose TEXT is "foo" and we want to complete to
 168        "foobar".  If WORD is "oo", return "oobar"; if WORD is
 169        "baz/foo", return "baz/foobar".  */
 170     completer_ftype *completer;
 171
 172     /* Destruction routine for this command.  If non-NULL, this is
 173        called when this command instance is destroyed.  This may be
 174        used to finalize the CONTEXT field, if needed.  */
 175     void (*destroyer) (struct cmd_list_element *self, void *context);
 176
 177     /* Type of "set" or "show" command (or SET_NOT_SET if not "set"
 178        or "show").  */
 179     ENUM_BITFIELD (cmd_types) type : 2;
 180
 181     /* Pointer to variable affected by "set" and "show".  Doesn't
 182        matter if type is not_set.  */
 183     void *var;
 184
 185     /* What kind of variable is *VAR?  */
 186     ENUM_BITFIELD (var_types) var_type : 4;
 187
 188     /* Pointer to NULL terminated list of enumerated values (like
 189        argv).  */
 190     const char *const *enums;
 191
 192     /* Pointer to command strings of user-defined commands */
 193     struct command_line *user_commands;
 194
 195     /* Pointer to command that is hooked by this one, (by hook_pre)
 196        so the hook can be removed when this one is deleted.  */
 197     struct cmd_list_element *hookee_pre;
 198
 199     /* Pointer to command that is hooked by this one, (by hook_post)
 200        so the hook can be removed when this one is deleted.  */
 201     struct cmd_list_element *hookee_post;
 202
 203     /* Pointer to command that is aliased by this one, so the
 204        aliased command can be located in case it has been hooked.  */
 205     struct cmd_list_element *cmd_pointer;
 206
 207     /* Start of a linked list of all aliases of this command.  */
 208     struct cmd_list_element *aliases;
 209
 210     /* Link pointer for aliases on an alias list.  */
 211     struct cmd_list_element *alias_chain;
 212   };
 213
 214 extern void help_cmd_list (struct cmd_list_element *, enum command_class,
 215                            char *, int, struct ui_file *);
 216
 217 /* Functions that implement commands about CLI commands.  */
 218
 219 extern void help_cmd (char *, struct ui_file *);
 220
 221 extern void apropos_cmd (struct ui_file *, struct cmd_list_element *,
 222                          struct re_pattern_buffer *, char *);
 223
 224 /* Used to mark commands that don't do anything.  If we just leave the
 225    function field NULL, the command is interpreted as a help topic, or
 226    as a class of commands.  */
 227
 228 extern void not_just_help_class_command (char *arg, int from_tty);
 229
 230 /* Exported to cli/cli-setshow.c */
 231
 232 extern void print_doc_line (struct ui_file *, char *);
 233
 234 extern const char * const auto_boolean_enums[];
 235
 236 #endif /* !defined (CLI_DECODE_H) */