/* Copyright (c) 2012 Apple Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ #ifndef __OS_BASE_H__ #define __OS_BASE_H__ #if __GNUC__ #define os_fastpath(x) ((__typeof__(x))(uintptr_t)__builtin_expect((uintptr_t)(x), ~0l)) #define os_slowpath(x) ((__typeof__(x))(uintptr_t)__builtin_expect((uintptr_t)(x), 0l)) #define os_constant(x) __builtin_constant_p((x)) #define os_hardware_trap() __asm__ __volatile__ (""); __builtin_trap() #define __OS_COMPILETIME_ASSERT__(e) __extension__({ \ char __compile_time_assert__[(e) ? 1 : -1]; \ (void)__compile_time_assert__; \ }) #define __OS_CONST __attribute__((__const__)) #define __OS_PRINTFLIKE(x,y) __attribute__((__format__(printf,x,y))) #else /* __GNUC__ */ #define os_fastpath(x) (x) #define os_slowpath(x) (x) #define os_constant(x) ((long)0) #define os_hardware_trap() abort() #define __OS_COMPILETIME_ASSERT__(e) (e) #define __OS_CONST #define __OS_PRINTFLIKE(x,y) #endif /* __GNUC__ */ #endif /* __OS_BASE_H__ */