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binutils-gdb/gdb/command.h
Lancelot SIX 1d7fe7f01b gdb: Introduce setting construct within cmd_list_element 
cmd_list_element can contain a pointer to data that can be set and / or
shown.  This is achieved with the void* VAR member which points to the
data that can be accessed, while the VAR_TYPE member (of type enum
var_types) indicates how to interpret the data pointed to.

With this pattern, the user of the cmd_list_element needs to know what
is the storage type associated with a given VAR_TYPES in order to do
the proper casting.  No automatic safeguard is available to prevent
miss-use of the pointer.  Client code typically looks something like:

	switch (c->var_type)
	{
	  case var_zuinteger:
	    unsigned int v = *(unsigned int*) c->var;
	    ...
	    break;
	  case var_boolean:
	    bool v = *(bool *) c->var;
	    ...
	    break;
	  ...
	}

This patch proposes to add an abstraction around the var_types and void*
pointer pair.  The abstraction is meant to prevent the user from having
to handle the cast and verify that the data is read or written as a type
that is coherent with the setting's var_type.  This is achieved by
introducing the struct setting which exposes a set of templated get /
set member functions.  The template parameter is the type of the
variable that holds the referred variable.

Using those accessors allows runtime checks to be inserted in order to
ensure that the data pointed to has the expected type.  For example,
instantiating the member functions with bool will yield something
similar to:

	const bool &get<bool> () const
	{
	  gdb_assert (m_var_type == var_boolean);
	  gdb_assert (m_var != nullptr);
	  return *static_cast<bool *> (m_var);
	}
	void set<bool> (const bool &var)
	{
	  gdb_assert (m_var_type == var_boolean);
	  gdb_assert (m_var != nullptr);
	  *static_cast<bool *> (m_var) = var;
	}

Using the new abstraction, our initial example becomes:

	switch (c->var_type)
	{
	  case var_zuinteger:
	    unsigned int v = c->var->get<unsigned int> ();
	    ...
	    break;
	  case var_boolean:
	    bool v = c->var->get<bool> ();
	    ...
	    break;
	  ...
	}

While the call site is still similar, the introduction of runtime checks
help ensure correct usage of the data.

In order to avoid turning the bulk of add_setshow_cmd_full into a
templated function, and following a suggestion from Pedro Alves, a
setting can be constructed from a pre validated type erased reference to
a variable.  This is what setting::erased_args is used for.

Introducing an opaque abstraction to describe a setting will also make
it possible to use callbacks to retrieve or set the value of the setting
on the fly instead of pointing to a static chunk of memory.  This will
be done added in a later commit.

Given that a cmd_list_element may or may not reference a setting, the
VAR and VAR_TYPES members of the struct are replaced with a
gdb::optional<setting> named VAR.

Few internal function signatures have been modified to take into account
this new abstraction:

-The functions value_from_setting, str_value_from_setting and
 get_setshow_command_value_string used to have a 'cmd_list_element *'
 parameter but only used it for the VAR and VAR_TYPE member. They now
 take a 'const setting &' parameter instead.
- Similarly, the 'void *' and a 'enum var_types' parameters of
  pascm_param_value and gdbpy_parameter_value have been replaced with a
  'const setting &' parameter.

No user visible change is expected after this patch.

Tested on GNU/Linux x86_64, with no regression noticed.

Co-authored-by: Simon Marchi <simon.marchi@polymtl.ca>
Change-Id: Ie1d08c3ceb8b30b3d7bf1efe036eb8acffcd2f34
2021-10-03 17:53:16 +01:00

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/* Header file for command creation.
Copyright (C) 1986-2021 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 "gdbsupport/gdb_vecs.h"
#include "gdbsupport/scoped_restore.h"
struct completion_tracker;
/* 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.
The class_alias is used for the user-defined aliases, defined
using the "alias" command.
Aliases pre-defined by GDB (e.g. the alias "bt" of the "backtrace" command)
are not using the class_alias.
Different pre-defined aliases of the same command do not necessarily
have the same classes. For example, class_stack is used for the
"backtrace" and its "bt" alias", while "info stack" (also an alias
of "backtrace" uses class_info. */
enum command_class
{
/* Classes of commands followed by a comment giving the name
to use in "help <classname>".
Note that help accepts unambiguous abbreviated class names. */
/* Special classes to help_list */
class_deprecated = -3,
all_classes = -2, /* help without <classname> */
all_commands = -1, /* all */
/* Classes of commands */
no_class = -1,
class_run = 0, /* running */
class_vars, /* data */
class_stack, /* stack */
class_files, /* files */
class_support, /* support */
class_info, /* status */
class_breakpoint, /* breakpoints */
class_trace, /* tracepoints */
class_alias, /* aliases */
class_bookmark,
class_obscure, /* obscure */
class_maintenance, /* internals */
class_tui, /* text-user-interface */
class_user, /* user-defined */
/* Used for "show" commands that have no corresponding "set" command. */
no_set_class
};
/* Types of "set" or "show" command. */
typedef enum var_types
{
/* "on" or "off". *VAR is a bool which is true for on,
false 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;
/* Return true if a setting of type VAR_TYPE is backed with type T.
This function is left without definition intentionally. This template is
specialized for all valid types that are used to back var_types. Therefore
if one tries to instantiate this un-specialized template it means the T
parameter is not a type used to back a var_type and it is most likely a
programming error. */
template<typename T>
bool var_type_uses (var_types var_type) = delete;
/* Return true if a setting of type T is backed by a bool variable. */
template<>
inline bool var_type_uses<bool> (var_types t)
{
return t == var_boolean;
};
/* Return true if a setting of type T is backed by a auto_boolean variable.
*/
template<>
inline bool var_type_uses<enum auto_boolean> (var_types t)
{
return t == var_auto_boolean;
}
/* Return true if a setting of type T is backed by an unsigned int variable.
*/
template<>
inline bool var_type_uses<unsigned int> (var_types t)
{
return (t == var_uinteger || t == var_zinteger || t == var_zuinteger);
}
/* Return true if a setting of type T is backed by an int variable. */
template<>
inline bool var_type_uses<int> (var_types t)
{
return (t == var_integer || t == var_zinteger
|| t == var_zuinteger_unlimited);
}
/* Return true if a setting of type T is backed by a char * variable. */
template<>
inline bool var_type_uses<char *> (var_types t)
{
return (t == var_string || t == var_string_noescape
|| t == var_optional_filename || t == var_filename);
}
/* Return true if a setting of type T is backed by a const char * variable.
*/
template<>
inline bool var_type_uses<const char *> (var_types t)
{
return t == var_enum;
}
/* Interface for getting and setting a setting's value.
The underlying data can be of any VAR_TYPES type. */
struct setting
{
/* Create a setting backed by a variable of type T.
Type T must match the var type VAR_TYPE (see VAR_TYPE_USES). */
template<typename T>
setting (var_types var_type, T *var)
: m_var_type (var_type), m_var (var)
{
gdb_assert (var != nullptr);
gdb_assert (var_type_uses<T> (var_type));
}
/* A setting can also be constructed with a pre-validated
type-erased variable. Use the following function to
validate & type-erase said variable/function pointers. */
struct erased_args
{
void *var;
};
template<typename T>
static erased_args erase_args (var_types var_type, T *var)
{
gdb_assert (var_type_uses<T> (var_type));
return {var};
}
/* Create a setting backed by pre-validated type-erased args.
ERASED_VAR's fields' real types must match the var type VAR_TYPE
(see VAR_TYPE_USES). */
setting (var_types var_type, const erased_args &args)
: m_var_type (var_type),
m_var (args.var)
{
}
/* Access the type of the current setting. */
var_types type () const
{
return m_var_type;
}
/* Return the current value.
The template parameter T is the type of the variable used to store the
setting. */
template<typename T>
const T &get () const
{
gdb_assert (var_type_uses<T> (m_var_type));
gdb_assert (m_var != nullptr);
return *static_cast<const T *> (m_var);
}
/* Sets the value of the setting to V.
The template parameter T indicates the type of the variable used to
store the setting.
The var_type of the setting must match T. */
template<typename T>
void set (const T &v)
{
/* Check that the current instance is of one of the supported types for
this instantiation. */
gdb_assert (var_type_uses<T> (m_var_type));
*static_cast<T *> (m_var) = v;
}
private:
/* The type of the variable M_VAR is pointing to. */
var_types m_var_type;
/* Pointer to the enclosed variable. The type of the variable is encoded
in M_VAR_TYPE. */
void *m_var;
};
/* This structure records one command'd definition. */
struct cmd_list_element;
/* The "simple" signature of command callbacks, which doesn't include a
cmd_list_element parameter. */
typedef void cmd_simple_func_ftype (const 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. */
/* Return TRUE if NAME is a valid user-defined command name.
This is a stricter subset of all gdb commands,
see find_command_name_length. */
extern bool valid_user_defined_cmd_name_p (const char *name);
/* Return TRUE if C is a valid command character. */
extern bool valid_cmd_char_p (int c);
/* Const-correct variant of the above. */
extern struct cmd_list_element *add_cmd (const char *, enum command_class,
cmd_simple_func_ftype *fun,
const char *,
struct cmd_list_element **);
/* Like add_cmd, but no command function is specified. */
extern struct cmd_list_element *add_cmd (const char *, enum command_class,
const char *,
struct cmd_list_element **);
extern struct cmd_list_element *add_cmd_suppress_notification
(const char *name, enum command_class theclass,
cmd_simple_func_ftype *fun, const char *doc,
struct cmd_list_element **list,
int *suppress_notification);
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_simple_func_ftype *fun,
const char *,
struct cmd_list_element **,
int,
struct cmd_list_element **);
/* Like add_prefix_cmd, but sets the callback to a function that
simply calls help_list. */
extern struct cmd_list_element *add_basic_prefix_cmd
(const char *, enum command_class, const char *, struct cmd_list_element **,
int, struct cmd_list_element **);
/* Like add_prefix_cmd, but useful for "show" prefixes. This sets the
callback to a function that simply calls cmd_show_list. */
extern struct cmd_list_element *add_show_prefix_cmd
(const char *, enum command_class, const char *, struct cmd_list_element **,
int, struct cmd_list_element **);
extern struct cmd_list_element *add_prefix_cmd_suppress_notification
(const char *name, enum command_class theclass,
cmd_simple_func_ftype *fun,
const char *doc, struct cmd_list_element **subcommands,
int allow_unknown,
struct cmd_list_element **list,
int *suppress_notification);
extern struct cmd_list_element *add_abbrev_prefix_cmd (const char *,
enum command_class,
cmd_simple_func_ftype *fun,
const char *,
struct cmd_list_element
**, int,
struct cmd_list_element
**);
typedef void cmd_func_ftype (const char *args, int from_tty,
cmd_list_element *c);
/* A completion routine. Add possible completions to tracker.
TEXT is the text beyond what was matched for the command itself
(leading whitespace is skipped). It stops where we are supposed to
stop completing (rl_point) and is '\0' terminated. WORD points in
the same buffer as TEXT, and completions should be returned
relative to this position. For example, suppose TEXT is "foo" and
we want to complete to "foobar". If WORD is "oo", return "oobar";
if WORD is "baz/foo", return "baz/foobar". */
typedef void completer_ftype (struct cmd_list_element *,
completion_tracker &tracker,
const char *text, const char *word);
/* Same, but for set_cmd_completer_handle_brkchars. */
typedef void completer_handle_brkchars_ftype (struct cmd_list_element *,
completion_tracker &tracker,
const char *text, const char *word);
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_handle_brkchars_ftype *);
/* 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_simple_func_eq (struct cmd_list_element *cmd,
cmd_simple_func_ftype *cfun);
/* 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);
/* 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 *,
std::string *,
int, int);
/* This routine takes a line of TEXT and a CLIST in which to start the
lookup. When it returns it will have incremented the text pointer past
the section of text it matched, set *RESULT_LIST to point to the list in
which the last word was matched, and will return a pointer to the cmd
list element which the text matches. It will return NULL if no match at
all was possible. It will return -1 (cast appropriately, ick) if ambigous
matches are possible; in this case *RESULT_LIST will be set to point to
the list in which there are ambiguous choices (and *TEXT will be set to
the ambiguous text string).
if DEFAULT_ARGS is not null, *DEFAULT_ARGS is set to the found command
default args (possibly empty).
If the located command was an abbreviation, this routine returns the base
command of the abbreviation. Note that *DEFAULT_ARGS will contain the
default args defined for the alias.
It does no error reporting whatsoever; control will always return
to the superior routine.
In the case of an ambiguous return (-1), *RESULT_LIST will be set to point
at the prefix_command (ie. the best match) *or* (special case) will be NULL
if no prefix command was ever found. For example, in the case of "info a",
"info" matches without ambiguity, but "a" could be "args" or "address", so
*RESULT_LIST is set to the cmd_list_element for "info". So in this case
RESULT_LIST should not be interpreted as a pointer to the beginning of a
list; it simply points to a specific command. In the case of an ambiguous
return *TEXT is advanced past the last non-ambiguous prefix (e.g.
"info t" can be "info types" or "info target"; upon return *TEXT has been
advanced past "info ").
If RESULT_LIST is NULL, don't set *RESULT_LIST (but don't otherwise
affect the operation).
This routine does *not* modify the text pointed to by TEXT.
If IGNORE_HELP_CLASSES is nonzero, ignore any command list elements which
are actually help classes rather than commands (i.e. the function field of
the struct cmd_list_element is NULL).
When LOOKUP_FOR_COMPLETION_P is true the completion is being requested
for the completion engine, no warnings should be printed. */
extern struct cmd_list_element *lookup_cmd_1
(const char **text, struct cmd_list_element *clist,
struct cmd_list_element **result_list, std::string *default_args,
int ignore_help_classes, bool lookup_for_completion_p = false);
/* Look up the command called NAME in the command list LIST.
Unlike LOOKUP_CMD, partial matches are ignored and only exact matches
on NAME are considered.
LIST is a chain of struct cmd_list_element's.
If IGNORE_HELP_CLASSES is true (the default), ignore any command list
elements which are actually help classes rather than commands (i.e.
the function field of the struct cmd_list_element is null).
If found, return the struct cmd_list_element for that command,
otherwise return NULLPTR. */
extern struct cmd_list_element *lookup_cmd_exact
(const char *name,
struct cmd_list_element *list,
bool ignore_help_classes = true);
extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
const char * );
extern void deprecated_cmd_warning (const char *, struct cmd_list_element *);
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_simple_func_ftype *fun,
const char *);
extern cmd_list_element *add_com_alias (const char *name,
cmd_list_element *target,
command_class theclass,
int abbrev_flag);
extern struct cmd_list_element *add_com_suppress_notification
(const char *name, enum command_class theclass,
cmd_simple_func_ftype *fun, const char *doc,
int *supress_notification);
extern struct cmd_list_element *add_info (const char *,
cmd_simple_func_ftype *fun,
const char *);
extern cmd_list_element *add_info_alias (const char *name,
cmd_list_element *target,
int abbrev_flag);
extern void complete_on_cmdlist (struct cmd_list_element *,
completion_tracker &tracker,
const char *, const char *, int);
extern void complete_on_enum (completion_tracker &tracker,
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;
/* Return value type for the add_setshow_* functions. */
struct set_show_commands
{
cmd_list_element *set, *show;
};
extern set_show_commands add_setshow_enum_cmd
(const char *name, command_class theclass, const char *const *enumlist,
const char **var, const char *set_doc, const char *show_doc,
const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_auto_boolean_cmd
(const char *name, command_class theclass, auto_boolean *var,
const char *set_doc, const char *show_doc, const char *help_doc,
cmd_func_ftype *set_func, show_value_ftype *show_func,
cmd_list_element **set_list, cmd_list_element **show_list);
extern set_show_commands add_setshow_boolean_cmd
(const char *name, command_class theclass, bool *var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_filename_cmd
(const char *name, command_class theclass, char **var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_string_cmd
(const char *name, command_class theclass, char **var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_string_noescape_cmd
(const char *name, command_class theclass, char **var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_optional_filename_cmd
(const char *name, command_class theclass, char **var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_integer_cmd
(const char *name, command_class theclass, int *var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_uinteger_cmd
(const char *name, command_class theclass, unsigned int *var,
const char *set_doc, const char *show_doc, const char *help_doc,
cmd_func_ftype *set_func, show_value_ftype *show_func,
cmd_list_element **set_list, cmd_list_element **show_list);
extern set_show_commands add_setshow_zinteger_cmd
(const char *name, command_class theclass, int *var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
cmd_list_element **show_list);
extern set_show_commands add_setshow_zuinteger_cmd
(const char *name, command_class theclass, unsigned int *var,
const char *set_doc, const char *show_doc, const char *help_doc,
cmd_func_ftype *set_func, show_value_ftype *show_func,
cmd_list_element **set_list, cmd_list_element **show_list);
extern set_show_commands add_setshow_zuinteger_unlimited_cmd
(const char *name, command_class theclass, int *var, const char *set_doc,
const char *show_doc, const char *help_doc, cmd_func_ftype *set_func,
show_value_ftype *show_func, cmd_list_element **set_list,
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);
/* Used everywhere whenever at least one parameter is required and
none is specified. */
extern void error_no_arg (const char *) ATTRIBUTE_NORETURN;
/* Command line saving and repetition.
Each input line executed is saved to possibly be repeated either
when the user types an empty line, or be repeated by a command
that wants to repeat the previously executed command. The below
functions control command repetition. */
/* Commands call dont_repeat if they do not want to be repeated by null
lines or by repeat_previous (). */
extern void dont_repeat ();
/* Commands call repeat_previous if they want to repeat the previous
command. Such commands that repeat the previous command must
indicate to not repeat themselves, to avoid recursive repeat.
repeat_previous marks the current command as not repeating, and
ensures get_saved_command_line returns the previous command, so
that the currently executing command can repeat it. If there's no
previous command, throws an error. Otherwise, returns the result
of get_saved_command_line, which now points at the command to
repeat. */
extern const char *repeat_previous ();
/* Prevent dont_repeat from working, and return a cleanup that
restores the previous state. */
extern scoped_restore_tmpl<int> prevent_dont_repeat (void);
/* Set the arguments that will be passed if the current command is
repeated. Note that the passed-in string must be a constant. */
extern void set_repeat_arguments (const char *args);
/* Returns the saved command line to repeat.
When a command is being executed, this is the currently executing
command line, unless the currently executing command has called
repeat_previous (): in this case, get_saved_command_line returns
the previously saved command line. */
extern char *get_saved_command_line ();
/* Takes a copy of CMD, for possible repetition. */
extern void save_command_line (const char *cmd);
/* 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 (const char *, int);
/* Call the command function. */
extern void cmd_func (struct cmd_list_element *cmd,
const char *args, int from_tty);
#endif /* !defined (COMMAND_H) */
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