gdb/cli/cli-decode.h

   1 /* Header file for GDB command decoding library.
   2
   3    Copyright (C) 2000-2018 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 #include "gdb_regex.h"
  27
  28 #if 0
  29 /* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
  30    cmd_types'' can be moved from "command.h" to "cli-decode.h".  */
  31 /* Not a set/show command.  Note that some commands which begin with
  32    "set" or "show" might be in this category, if their syntax does
  33    not fall into one of the following categories.  */
  34 typedef enum cmd_types
  35   {
  36     not_set_cmd,
  37     set_cmd,
  38     show_cmd
  39   }
  40 cmd_types;
  41 #endif
  42
  43 /* This structure records one command'd definition.  */
  44
  45
  46 struct cmd_list_element
  47   {
  48     cmd_list_element (const char *name_, enum command_class theclass_,
  49                       const char *doc_)
  50       : name (name_),
  51         theclass (theclass_),
  52         cmd_deprecated (0),
  53         deprecated_warn_user (0),
  54         malloced_replacement (0),
  55         doc_allocated (0),
  56         hook_in (0),
  57         allow_unknown (0),
  58         abbrev_flag (0),
  59         type (not_set_cmd),
  60         var_type (var_boolean),
  61         doc (doc_)
  62     {
  63       memset (&function, 0, sizeof (function));
  64     }
  65
  66     ~cmd_list_element ()
  67     {
  68       if (doc && doc_allocated)
  69         xfree ((char *) doc);
  70     }
  71
  72     DISABLE_COPY_AND_ASSIGN (cmd_list_element);
  73
  74
  75     /* Points to next command in this list.  */
  76     struct cmd_list_element *next = nullptr;
  77
  78     /* Name of this command.  */
  79     const char *name;
  80
  81     /* Command class; class values are chosen by application program.  */
  82     enum command_class theclass;
  83
  84     /* When 1 indicated that this command is deprecated.  It may be
  85        removed from gdb's command set in the future.  */
  86
  87     unsigned int cmd_deprecated : 1;
  88
  89     /* The user needs to be warned that this is a deprecated command.
  90        The user should only be warned the first time a command is
  91        used.  */
  92
  93     unsigned int deprecated_warn_user : 1;
  94
  95     /* When functions are deprecated at compile time (this is the way
  96        it should, in general, be done) the memory containing the
  97        replacement string is statically allocated.  In some cases it
  98        makes sense to deprecate commands at runtime (the testsuite is
  99        one example).  In this case the memory for replacement is
 100        malloc'ed.  When a command is undeprecated or re-deprecated at
 101        runtime we don't want to risk calling free on statically
 102        allocated memory, so we check this flag.  */
 103
 104     unsigned int malloced_replacement : 1;
 105
 106     /* Set if the doc field should be xfree'd.  */
 107
 108     unsigned int doc_allocated : 1;
 109
 110     /* Flag that specifies if this command is already running its hook.  */
 111     /* Prevents the possibility of hook recursion.  */
 112     unsigned int hook_in : 1;
 113
 114     /* For prefix commands only:
 115        nonzero means do not get an error if subcommand is not
 116        recognized; call the prefix's own function in that case.  */
 117     unsigned int allow_unknown : 1;
 118
 119     /* Nonzero says this is an abbreviation, and should not
 120        be mentioned in lists of commands.
 121        This allows "br<tab>" to complete to "break", which it
 122        otherwise wouldn't.  */
 123     unsigned int abbrev_flag : 1;
 124
 125     /* Type of "set" or "show" command (or SET_NOT_SET if not "set"
 126        or "show").  */
 127     ENUM_BITFIELD (cmd_types) type : 2;
 128
 129     /* What kind of variable is *VAR?  */
 130     ENUM_BITFIELD (var_types) var_type : 4;
 131
 132     /* Function definition of this command.  NULL for command class
 133        names and for help topics that are not really commands.  NOTE:
 134        cagney/2002-02-02: This function signature is evolving.  For
 135        the moment suggest sticking with either set_cmd_cfunc() or
 136        set_cmd_sfunc().  */
 137     void (*func) (struct cmd_list_element *c, const char *args, int from_tty)
 138       = nullptr;
 139     /* The command's real callback.  At present func() bounces through
 140        to one of the below.  */
 141     union
 142       {
 143         /* If type is not_set_cmd, call it like this: */
 144         cmd_const_cfunc_ftype *const_cfunc;
 145         /* If type is set_cmd or show_cmd, first set the variables,
 146            and then call this: */
 147         cmd_const_sfunc_ftype *sfunc;
 148       }
 149     function;
 150
 151     /* Local state (context) for this command.  This can be anything.  */
 152     void *context = nullptr;
 153
 154     /* Documentation of this command (or help topic).
 155        First line is brief documentation; remaining lines form, with it,
 156        the full documentation.  First line should end with a period.
 157        Entire string should also end with a period, not a newline.  */
 158     const char *doc;
 159
 160     /* For set/show commands.  A method for printing the output to the
 161        specified stream.  */
 162     show_value_ftype *show_value_func = nullptr;
 163
 164     /* If this command is deprecated, this is the replacement name.  */
 165     const char *replacement = nullptr;
 166
 167     /* If this command represents a show command, then this function
 168        is called before the variable's value is examined.  */
 169     void (*pre_show_hook) (struct cmd_list_element *c) = nullptr;
 170
 171     /* Hook for another command to be executed before this command.  */
 172     struct cmd_list_element *hook_pre = nullptr;
 173
 174     /* Hook for another command to be executed after this command.  */
 175     struct cmd_list_element *hook_post = nullptr;
 176
 177     /* Nonzero identifies a prefix command.  For them, the address
 178        of the variable containing the list of subcommands.  */
 179     struct cmd_list_element **prefixlist = nullptr;
 180
 181     /* For prefix commands only:
 182        String containing prefix commands to get here: this one
 183        plus any others needed to get to it.  Should end in a space.
 184        It is used before the word "command" in describing the
 185        commands reached through this prefix.  */
 186     const char *prefixname = nullptr;
 187
 188     /* The prefix command of this command.  */
 189     struct cmd_list_element *prefix = nullptr;
 190
 191     /* Completion routine for this command.  */
 192     completer_ftype *completer = symbol_completer;
 193
 194     /* Handle the word break characters for this completer.  Usually
 195        this function need not be defined, but for some types of
 196        completers (e.g., Python completers declared as methods inside
 197        a class) the word break chars may need to be redefined
 198        depending on the completer type (e.g., for filename
 199        completers).  */
 200     completer_handle_brkchars_ftype *completer_handle_brkchars = nullptr;
 201
 202     /* Destruction routine for this command.  If non-NULL, this is
 203        called when this command instance is destroyed.  This may be
 204        used to finalize the CONTEXT field, if needed.  */
 205     void (*destroyer) (struct cmd_list_element *self, void *context) = nullptr;
 206
 207     /* Pointer to variable affected by "set" and "show".  Doesn't
 208        matter if type is not_set.  */
 209     void *var = nullptr;
 210
 211     /* Pointer to NULL terminated list of enumerated values (like
 212        argv).  */
 213     const char *const *enums = nullptr;
 214
 215     /* Pointer to command strings of user-defined commands */
 216     struct command_line *user_commands = nullptr;
 217
 218     /* Pointer to command that is hooked by this one, (by hook_pre)
 219        so the hook can be removed when this one is deleted.  */
 220     struct cmd_list_element *hookee_pre = nullptr;
 221
 222     /* Pointer to command that is hooked by this one, (by hook_post)
 223        so the hook can be removed when this one is deleted.  */
 224     struct cmd_list_element *hookee_post = nullptr;
 225
 226     /* Pointer to command that is aliased by this one, so the
 227        aliased command can be located in case it has been hooked.  */
 228     struct cmd_list_element *cmd_pointer = nullptr;
 229
 230     /* Start of a linked list of all aliases of this command.  */
 231     struct cmd_list_element *aliases = nullptr;
 232
 233     /* Link pointer for aliases on an alias list.  */
 234     struct cmd_list_element *alias_chain = nullptr;
 235
 236     /* If non-null, the pointer to a field in 'struct
 237        cli_suppress_notification', which will be set to true in cmd_func
 238        when this command is being executed.  It will be set back to false
 239        when the command has been executed.  */
 240     int *suppress_notification = nullptr;
 241   };
 242
 243 extern void help_cmd_list (struct cmd_list_element *, enum command_class,
 244                            const char *, int, struct ui_file *);
 245
 246 /* Functions that implement commands about CLI commands.  */
 247
 248 extern void help_cmd (const char *, struct ui_file *);
 249
 250 extern void apropos_cmd (struct ui_file *, struct cmd_list_element *,
 251                          compiled_regex &, const char *);
 252
 253 /* Used to mark commands that don't do anything.  If we just leave the
 254    function field NULL, the command is interpreted as a help topic, or
 255    as a class of commands.  */
 256
 257 extern void not_just_help_class_command (const char *arg, int from_tty);
 258
 259 /* Exported to cli/cli-setshow.c */
 260
 261 extern void print_doc_line (struct ui_file *, const char *);
 262
 263 extern const char * const auto_boolean_enums[];
 264
 265 /* Verify whether a given cmd_list_element is a user-defined command.
 266    Return 1 if it is user-defined.  Return 0 otherwise.  */
 267
 268 extern int cli_user_command_p (struct cmd_list_element *);
 269
 270 extern int find_command_name_length (const char *);
 271
 272 #endif /* !defined (CLI_DECODE_H) */