path: root/gdb/command.h

/* Header file for command creation.

   Copyright (C) 1986-2017 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#if !defined (COMMAND_H)
#define COMMAND_H 1

#include "gdb_vecs.h"

/* This file defines the public interface for any code wanting to
   create commands.  */

/* Command classes are top-level categories into which commands are
   broken down for "help" purposes.

   Notes on classes: class_alias is for alias commands which are not
   abbreviations of the original command.  class-pseudo is for
   commands which are not really commands nor help topics ("stop").  */

enum command_class
{
  /* Special args to help_list */
  class_deprecated = -3, all_classes = -2, all_commands = -1,
  /* Classes of commands */
  no_class = -1, class_run = 0, class_vars, class_stack, class_files,
  class_support, class_info, class_breakpoint, class_trace,
  class_alias, class_bookmark, class_obscure, class_maintenance,
  class_pseudo, class_tui, class_user, class_xdb,
  no_set_class	/* Used for "show" commands that have no corresponding
		   "set" command.  */
};

/* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
   cmd_types'' can be moved from "command.h" to "cli-decode.h".  */
/* Not a set/show command.  Note that some commands which begin with
   "set" or "show" might be in this category, if their syntax does
   not fall into one of the following categories.  */
typedef enum cmd_types
  {
    not_set_cmd,
    set_cmd,
    show_cmd
  }
cmd_types;

/* Types of "set" or "show" command.  */
typedef enum var_types
  {
    /* "on" or "off".  *VAR is an integer which is nonzero for on,
       zero for off.  */
    var_boolean,

    /* "on" / "true" / "enable" or "off" / "false" / "disable" or
       "auto.  *VAR is an ``enum auto_boolean''.  NOTE: In general a
       custom show command will need to be implemented - one that for
       "auto" prints both the "auto" and the current auto-selected
       value.  */
    var_auto_boolean,

    /* Unsigned Integer.  *VAR is an unsigned int.  The user can type
       0 to mean "unlimited", which is stored in *VAR as UINT_MAX.  */
    var_uinteger,

    /* Like var_uinteger but signed.  *VAR is an int.  The user can
       type 0 to mean "unlimited", which is stored in *VAR as
       INT_MAX.  The only remaining use of it is the Python API.
       Don't use it elsewhere.  */
    var_integer,

    /* String which the user enters with escapes (e.g. the user types
       \n and it is a real newline in the stored string).
       *VAR is a malloc'd string, or NULL if the string is empty.  */
    var_string,
    /* String which stores what the user types verbatim.
       *VAR is a malloc'd string, or NULL if the string is empty.  */
    var_string_noescape,
    /* String which stores a filename.  (*VAR) is a malloc'd string,
       or "" if the string was empty.  */
    var_optional_filename,
    /* String which stores a filename.  (*VAR) is a malloc'd
       string.  */
    var_filename,
    /* ZeroableInteger.  *VAR is an int.  Like var_integer except
       that zero really means zero.  */
    var_zinteger,
    /* ZeroableUnsignedInteger.  *VAR is an unsigned int.  Zero really
       means zero.  */
    var_zuinteger,
    /* ZeroableUnsignedInteger with unlimited value.  *VAR is an int,
       but its range is [0, INT_MAX].  -1 stands for unlimited and
       other negative numbers are not allowed.  */
    var_zuinteger_unlimited,
    /* Enumerated type.  Can only have one of the specified values.
       *VAR is a char pointer to the name of the element that we
       find.  */
    var_enum
  }
var_types;

/* This structure records one command'd definition.  */
struct cmd_list_element;

typedef void cmd_cfunc_ftype (char *args, int from_tty);

/* This structure specifies notifications to be suppressed by a cli
   command interpreter.  */

struct cli_suppress_notification
{
  /* Inferior, thread, frame selected notification suppressed?  */
  int user_selected_context;
};

extern struct cli_suppress_notification cli_suppress_notification;

/* Forward-declarations of the entry-points of cli/cli-decode.c.  */

/* API to the manipulation of command lists.  */

extern int valid_user_defined_cmd_name_p (const char *name);

extern struct cmd_list_element *add_cmd (const char *, enum command_class,
					 cmd_cfunc_ftype *fun,
					 const char *,
					 struct cmd_list_element **);

extern struct cmd_list_element *add_alias_cmd (const char *, const char *,
					       enum command_class, int,
					       struct cmd_list_element **);

extern struct cmd_list_element *add_alias_cmd (const char *,
					       cmd_list_element *,
					       enum command_class, int,
					       struct cmd_list_element **);


extern struct cmd_list_element *add_prefix_cmd (const char *, enum command_class,
						cmd_cfunc_ftype *fun,
						const char *,
						struct cmd_list_element **,
						const char *, int,
						struct cmd_list_element **);

extern struct cmd_list_element *add_abbrev_prefix_cmd (const char *,
						       enum command_class,
						       cmd_cfunc_ftype *fun,
						       const char *,
						       struct cmd_list_element
						       **, const char *, int,
						       struct cmd_list_element
						       **);

/* Set the commands corresponding callback.  */

extern void set_cmd_cfunc (struct cmd_list_element *cmd,
			   cmd_cfunc_ftype *cfunc);

typedef void cmd_sfunc_ftype (char *args, int from_tty,
			      struct cmd_list_element *c);
extern void set_cmd_sfunc (struct cmd_list_element *cmd,
			   cmd_sfunc_ftype *sfunc);

typedef VEC (char_ptr) *completer_ftype (struct cmd_list_element *,
					 const char *, const char *);

typedef void completer_ftype_void (struct cmd_list_element *,
				   const char *, const char *);

extern void set_cmd_completer (struct cmd_list_element *, completer_ftype *);

/* Set the completer_handle_brkchars callback.  */

extern void set_cmd_completer_handle_brkchars (struct cmd_list_element *,
					       completer_ftype_void *);

/* HACK: cagney/2002-02-23: Code, mostly in tracepoints.c, grubs
   around in cmd objects to test the value of the commands sfunc().  */
extern int cmd_cfunc_eq (struct cmd_list_element *cmd,
			 cmd_cfunc_ftype *cfun);

/* Each command object has a local context attached to it.  */
extern void set_cmd_context (struct cmd_list_element *cmd,
			     void *context);
extern void *get_cmd_context (struct cmd_list_element *cmd);


/* Execute CMD's pre/post hook.  Throw an error if the command fails.
   If already executing this pre/post hook, or there is no pre/post
   hook, the call is silently ignored.  */
extern void execute_cmd_pre_hook (struct cmd_list_element *cmd);
extern void execute_cmd_post_hook (struct cmd_list_element *cmd);

/* Return the type of the command.  */
extern enum cmd_types cmd_type (struct cmd_list_element *cmd);

/* Flag for an ambiguous cmd_list result.  */
#define CMD_LIST_AMBIGUOUS ((struct cmd_list_element *) -1)

extern struct cmd_list_element *lookup_cmd (const char **,
					    struct cmd_list_element *,
					    const char *,
					    int, int);

extern struct cmd_list_element *lookup_cmd_1 (const char **,
					      struct cmd_list_element *,
					      struct cmd_list_element **,
					      int);

extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
					       const char * );

extern void deprecated_cmd_warning (const char *);

extern int lookup_cmd_composition (const char *text,
				   struct cmd_list_element **alias,
				   struct cmd_list_element **prefix_cmd,
				   struct cmd_list_element **cmd);

extern struct cmd_list_element *add_com (const char *, enum command_class,
					 cmd_cfunc_ftype *fun,
					 const char *);

extern struct cmd_list_element *add_com_alias (const char *, const char *,
					       enum command_class, int);

extern struct cmd_list_element *add_com_suppress_notification
		       (const char *name, enum command_class theclass,
			cmd_cfunc_ftype *fun, const char *doc,
			int *supress_notification);

extern struct cmd_list_element *add_info (const char *,
					  cmd_cfunc_ftype *fun,
					  const char *);

extern struct cmd_list_element *add_info_alias (const char *, const char *,
						int);

extern VEC (char_ptr) *complete_on_cmdlist (struct cmd_list_element *,
					    const char *, const char *, int);

extern VEC (char_ptr) *complete_on_enum (const char *const *enumlist,
					 const char *, const char *);

/* Functions that implement commands about CLI commands.  */

extern void help_list (struct cmd_list_element *, const char *,
		       enum command_class, struct ui_file *);

/* Method for show a set/show variable's VALUE on FILE.  If this
   method isn't supplied deprecated_show_value_hack() is called (which
   is not good).  */
typedef void (show_value_ftype) (struct ui_file *file,
				 int from_tty,
				 struct cmd_list_element *cmd,
				 const char *value);
/* NOTE: i18n: This function is not i18n friendly.  Callers should
   instead print the value out directly.  */
extern show_value_ftype deprecated_show_value_hack;

extern void add_setshow_enum_cmd (const char *name,
				  enum command_class theclass,
				  const char *const *enumlist,
				  const char **var,
				  const char *set_doc,
				  const char *show_doc,
				  const char *help_doc,
				  cmd_sfunc_ftype *set_func,
				  show_value_ftype *show_func,
				  struct cmd_list_element **set_list,
				  struct cmd_list_element **show_list);

extern void add_setshow_auto_boolean_cmd (const char *name,
					  enum command_class theclass,
					  enum auto_boolean *var,
					  const char *set_doc,
					  const char *show_doc,
					  const char *help_doc,
					  cmd_sfunc_ftype *set_func,
					  show_value_ftype *show_func,
					  struct cmd_list_element **set_list,
					  struct cmd_list_element **show_list);

extern void add_setshow_boolean_cmd (const char *name,
				     enum command_class theclass,
				     int *var,
				     const char *set_doc, const char *show_doc,
				     const char *help_doc,
				     cmd_sfunc_ftype *set_func,
				     show_value_ftype *show_func,
				     struct cmd_list_element **set_list,
				     struct cmd_list_element **show_list);

extern void add_setshow_filename_cmd (const char *name,
				      enum command_class theclass,
				      char **var,
				      const char *set_doc,
				      const char *show_doc,
				      const char *help_doc,
				      cmd_sfunc_ftype *set_func,
				      show_value_ftype *show_func,
				      struct cmd_list_element **set_list,
				      struct cmd_list_element **show_list);

extern void add_setshow_string_cmd (const char *name,
				    enum command_class theclass,
				    char **var,
				    const char *set_doc,
				    const char *show_doc,
				    const char *help_doc,
				    cmd_sfunc_ftype *set_func,
				    show_value_ftype *show_func,
				    struct cmd_list_element **set_list,
				    struct cmd_list_element **show_list);

extern struct cmd_list_element *add_setshow_string_noescape_cmd
		      (const char *name,
		       enum command_class theclass,
		       char **var,
		       const char *set_doc,
		       const char *show_doc,
		       const char *help_doc,
		       cmd_sfunc_ftype *set_func,
		       show_value_ftype *show_func,
		       struct cmd_list_element **set_list,
		       struct cmd_list_element **show_list);

extern void add_setshow_optional_filename_cmd (const char *name,
					       enum command_class theclass,
					       char **var,
					       const char *set_doc,
					       const char *show_doc,
					       const char *help_doc,
					       cmd_sfunc_ftype *set_func,
					       show_value_ftype *show_func,
					       struct cmd_list_element **set_list,
					       struct cmd_list_element **show_list);

extern void add_setshow_integer_cmd (const char *name,
				     enum command_class theclass,
				     int *var,
				     const char *set_doc,
				     const char *show_doc,
				     const char *help_doc,
				     cmd_sfunc_ftype *set_func,
				     show_value_ftype *show_func,
				     struct cmd_list_element **set_list,
				     struct cmd_list_element **show_list);

extern void add_setshow_uinteger_cmd (const char *name,
				      enum command_class theclass,
				      unsigned int *var,
				      const char *set_doc,
				      const char *show_doc,
				      const char *help_doc,
				      cmd_sfunc_ftype *set_func,
				      show_value_ftype *show_func,
				      struct cmd_list_element **set_list,
				      struct cmd_list_element **show_list);

extern void add_setshow_zinteger_cmd (const char *name,
				      enum command_class theclass,
				      int *var,
				      const char *set_doc,
				      const char *show_doc,
				      const char *help_doc,
				      cmd_sfunc_ftype *set_func,
				      show_value_ftype *show_func,
				      struct cmd_list_element **set_list,
				      struct cmd_list_element **show_list);

extern void add_setshow_zuinteger_cmd (const char *name,
				       enum command_class theclass,
				       unsigned int *var,
				       const char *set_doc,
				       const char *show_doc,
				       const char *help_doc,
				       cmd_sfunc_ftype *set_func,
				       show_value_ftype *show_func,
				       struct cmd_list_element **set_list,
				       struct cmd_list_element **show_list);

extern void
  add_setshow_zuinteger_unlimited_cmd (const char *name,
				       enum command_class theclass,
				       int *var,
				       const char *set_doc,
				       const char *show_doc,
				       const char *help_doc,
				       cmd_sfunc_ftype *set_func,
				       show_value_ftype *show_func,
				       struct cmd_list_element **set_list,
				       struct cmd_list_element **show_list);

/* Do a "show" command for each thing on a command list.  */

extern void cmd_show_list (struct cmd_list_element *, int, const char *);

/* Used everywhere whenever at least one parameter is required and
   none is specified.  */

extern void error_no_arg (const char *) ATTRIBUTE_NORETURN;

extern void dont_repeat (void);

extern scoped_restore_tmpl<int> prevent_dont_repeat (void);

/* Used to mark commands that don't do anything.  If we just leave the
   function field NULL, the command is interpreted as a help topic, or
   as a class of commands.  */

extern void not_just_help_class_command (char *, int);

/* Check function pointer.  */
extern int cmd_func_p (struct cmd_list_element *cmd);

/* Call the command function.  */
extern void cmd_func (struct cmd_list_element *cmd,
		      char *args, int from_tty);

#endif /* !defined (COMMAND_H) */