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/* GNU Objective C Runtime messaging declarations
Copyright (C) 1993, 1995, 1996, 2004, 2009,
2010 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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, or (at your option)
any later version.
GCC 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef __objc_message_INCLUDE_GNU
#define __objc_message_INCLUDE_GNU
#ifdef __cplusplus
extern "C" {
#endif
#include "objc.h"
#include "objc-decls.h"
/* This file includes declarations of the messaging functions and
types.
*/
/* Compatibility note: the messaging function is one area where the
GNU runtime and the Apple/NeXT runtime differ significantly. If
you can, it is recommended that you use higher-level facilities
(provided by a Foundation library such as GNUstep Base) to perform
forwarding or other advanced messaging tricks.
*/
typedef void* retval_t; /* return value */
typedef void(*apply_t)(void); /* function pointer */
typedef union arglist {
char *arg_ptr;
char arg_regs[sizeof (char*)];
} *arglist_t; /* argument frame */
objc_EXPORT IMP objc_msg_lookup(id receiver, SEL op);
/*
* Structure used when a message is send to a class's super class.
* The compiler generates one of these structures and passes it to
* objc_msg_lookup_super.
*/
typedef struct objc_super {
id self; /* Id of the object sending the message. */
#ifdef __cplusplus
/* The new version of the API will always use 'super_class'. */
Class super_class;
#else
Class class; /* Object's super class. */
#endif
} Super, *Super_t;
objc_EXPORT IMP objc_msg_lookup_super(Super_t super, SEL sel);
objc_EXPORT retval_t objc_msg_sendv(id, SEL, arglist_t);
/*
* Hooks for method forwarding. This makes it easy to substitute a
* library, such as ffcall, that implements closures, thereby avoiding
* gcc's __builtin_apply problems. __objc_msg_forward2's result will
* be preferred over that of __objc_msg_forward if both are set and
* return non-NULL.
*
* TODO: The API should define objc_set_msg_forward_handler () or
* similar instead of these hooks.
*/
objc_EXPORT IMP (*__objc_msg_forward)(SEL);
objc_EXPORT IMP (*__objc_msg_forward2)(id, SEL);
#ifdef __cplusplus
}
#endif
#endif /* not __objc_message_INCLUDE_GNU */
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