1/*-
2 * Copyright (c) 2014 David T Chisnall
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/11.0/lib/libc/include/block_abi.h 264069 2014-04-03 08:08:36Z theraven $
27 */
28
29#ifdef __BLOCKS__
30/**
31 * Declares a block variable.  This macro is defined in the trivial way for
32 * compilers that support blocks and exposing the ABI in the source for other
33 * compilers.
34 */
35#define	DECLARE_BLOCK(retTy, name, argTys, ...)\
36	retTy(^name)(argTys, ## __VA_ARGS__)
37/**
38 * Calls a block variable.  This macro is defined in the trivial way for
39 * compilers that support blocks and exposing the ABI in the source for other
40 * compilers.
41 */
42#define CALL_BLOCK(name, ...) name(__VA_ARGS__)
43#else // !__BLOCKS__
44#define	DECLARE_BLOCK(retTy, name, argTys, ...)\
45	struct {\
46		void *isa;\
47		int flags;\
48		int reserved;\
49		retTy (*invoke)(void *, ...);\
50	} *name
51#define CALL_BLOCK(name, ...) (name)->invoke(name, __VA_ARGS__)
52#endif // __BLOCKS__
53/**
54 * Returns the pointer to the block-invoke function.  This is used for passing
55 * blocks to functions that want a function pointer and a data pointer.
56 */
57#define GET_BLOCK_FUNCTION(x) \
58	(((struct {\
59		void *isa;\
60		int flags;\
61		int reserved;\
62		void (*invoke)(void *, ...);\
63	}*)(void*)x)->invoke)
64