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 27 #ifdef __BLOCKS__ 28 /** 29 * Declares a block variable. This macro is defined in the trivial way for 30 * compilers that support blocks and exposing the ABI in the source for other 31 * compilers. 32 */ 33 #define DECLARE_BLOCK(retTy, name, argTys, ...)\ 34 retTy(^name)(argTys, ## __VA_ARGS__) 35 /** 36 * Calls a block variable. This macro is defined in the trivial way for 37 * compilers that support blocks and exposing the ABI in the source for other 38 * compilers. 39 */ 40 #define CALL_BLOCK(name, ...) name(__VA_ARGS__) 41 #else // !__BLOCKS__ 42 #define DECLARE_BLOCK(retTy, name, argTys, ...)\ 43 struct {\ 44 void *isa;\ 45 int flags;\ 46 int reserved;\ 47 retTy (*invoke)(void *, ...);\ 48 } *name 49 #define CALL_BLOCK(name, ...) (name)->invoke(name, __VA_ARGS__) 50 #endif // __BLOCKS__ 51 /** 52 * Returns the pointer to the block-invoke function. This is used for passing 53 * blocks to functions that want a function pointer and a data pointer. 54 */ 55 #define GET_BLOCK_FUNCTION(x) \ 56 (((struct {\ 57 void *isa;\ 58 int flags;\ 59 int reserved;\ 60 void (*invoke)(void *, ...);\ 61 }*)(void*)x)->invoke) 62