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/*
* Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WTF_Compiler_h
#define WTF_Compiler_h
/* COMPILER() - the compiler being used to build the project */
#define COMPILER(WTF_FEATURE) (defined WTF_COMPILER_##WTF_FEATURE && WTF_COMPILER_##WTF_FEATURE)
/* COMPILER_SUPPORTS() - whether the compiler being used to build the project supports the given feature. */
#define COMPILER_SUPPORTS(WTF_COMPILER_FEATURE) (defined WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE && WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE)
/* COMPILER_QUIRK() - whether the compiler being used to build the project requires a given quirk. */
#define COMPILER_QUIRK(WTF_COMPILER_QUIRK) (defined WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK && WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK)
/* ==== COMPILER() - the compiler being used to build the project ==== */
/* COMPILER(CLANG) - Clang */
#if defined(__clang__)
#define WTF_COMPILER_CLANG 1
/* Specific compiler features */
#define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS __has_feature(cxx_explicit_conversions)
#endif
/* COMPILER(MSVC) - Microsoft Visual C++ */
#if defined(_MSC_VER)
#define WTF_COMPILER_MSVC 1
#endif
/* COMPILER(GCC) - GNU Compiler Collection */
#if defined(__GNUC__)
#define WTF_COMPILER_GCC 1
#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
#define GCC_VERSION_AT_LEAST(major, minor, patch) (GCC_VERSION >= (major * 10000 + minor * 100 + patch))
#else
/* Define this for !GCC compilers, just so we can write things like GCC_VERSION_AT_LEAST(4, 1, 0). */
#define GCC_VERSION_AT_LEAST(major, minor, patch) 0
#endif
/* Specific compiler features */
#if COMPILER(GCC) && !COMPILER(CLANG)
#define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS 1
#endif /* COMPILER(GCC) */
/* ==== Compiler features ==== */
/* ALWAYS_INLINE */
#ifndef ALWAYS_INLINE
#if COMPILER(GCC) && defined(NDEBUG) && !COMPILER(MINGW)
#define ALWAYS_INLINE inline __attribute__((__always_inline__))
#elif COMPILER(MSVC) && defined(NDEBUG)
#define ALWAYS_INLINE __forceinline
#else
#define ALWAYS_INLINE inline
#endif
#endif
/* NEVER_INLINE */
#ifndef NEVER_INLINE
#if COMPILER(GCC)
#define NEVER_INLINE __attribute__((__noinline__))
#elif COMPILER(MSVC)
#define NEVER_INLINE __declspec(noinline)
#else
#define NEVER_INLINE
#endif
#endif
/* UNLIKELY */
#ifndef UNLIKELY
#if COMPILER(GCC)
#define UNLIKELY(x) __builtin_expect((x), 0)
#else
#define UNLIKELY(x) (x)
#endif
#endif
/* LIKELY */
#ifndef LIKELY
#if COMPILER(GCC)
#define LIKELY(x) __builtin_expect((x), 1)
#else
#define LIKELY(x) (x)
#endif
#endif
/* NO_RETURN */
#ifndef NO_RETURN
#if COMPILER(GCC)
#define NO_RETURN __attribute((__noreturn__))
#elif COMPILER(MSVC)
#define NO_RETURN __declspec(noreturn)
#else
#define NO_RETURN
#endif
#endif
/* WARN_UNUSED_RETURN */
#if COMPILER(GCC)
#define WARN_UNUSED_RETURN __attribute__ ((warn_unused_result))
#else
#define WARN_UNUSED_RETURN
#endif
/* ALLOW_UNUSED_LOCAL */
#define ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0
/* REFERENCED_FROM_ASM */
#ifndef REFERENCED_FROM_ASM
#if COMPILER(GCC)
#define REFERENCED_FROM_ASM __attribute__((used))
#else
#define REFERENCED_FROM_ASM
#endif
#endif
/* OBJC_CLASS */
#ifndef OBJC_CLASS
#ifdef __OBJC__
#define OBJC_CLASS @class
#else
#define OBJC_CLASS class
#endif
#endif
/* WTF_PRETTY_FUNCTION */
#if COMPILER(GCC)
#define WTF_COMPILER_SUPPORTS_PRETTY_FUNCTION 1
#define WTF_PRETTY_FUNCTION __PRETTY_FUNCTION__
#elif COMPILER(MSVC)
#define WTF_COMPILER_SUPPORTS_PRETTY_FUNCTION 1
#define WTF_PRETTY_FUNCTION __FUNCSIG__
#else
#define WTF_PRETTY_FUNCTION __FUNCTION__
#endif
#endif /* WTF_Compiler_h */
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