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 * $FreeBSD$ 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