#ifndef WTF_Compiler_h
#define WTF_Compiler_h
#define COMPILER(WTF_FEATURE) (defined WTF_COMPILER_##WTF_FEATURE && WTF_COMPILER_##WTF_FEATURE)
#define COMPILER_SUPPORTS(WTF_COMPILER_FEATURE) (defined WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE && WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE)
#define COMPILER_QUIRK(WTF_COMPILER_QUIRK) (defined WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK && WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK)
#ifdef __has_builtin
#define COMPILER_HAS_CLANG_BUILTIN(x) __has_builtin(x)
#else
#define COMPILER_HAS_CLANG_BUILTIN(x) 0
#endif
#if defined(__clang__)
#define WTF_COMPILER_CLANG 1
#define WTF_COMPILER_SUPPORTS_BLOCKS __has_feature(blocks)
#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT __has_feature(c_static_assert)
#define WTF_COMPILER_SUPPORTS_CXX_CONSTEXPR __has_feature(cxx_constexpr)
#define WTF_COMPILER_SUPPORTS_CXX_REFERENCE_QUALIFIED_FUNCTIONS __has_feature(cxx_reference_qualified_functions)
#define WTF_COMPILER_SUPPORTS_CXX_USER_LITERALS __has_feature(cxx_user_literals)
#define WTF_COMPILER_SUPPORTS_FALLTHROUGH_WARNINGS __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
#endif
#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))
#endif
#if !defined(GCC_VERSION_AT_LEAST)
#define GCC_VERSION_AT_LEAST(major, minor, patch) 0
#endif
#if COMPILER(GCC) && !COMPILER(CLANG) && !GCC_VERSION_AT_LEAST(4, 7, 0)
#error "Please use a newer version of GCC. WebKit requires GCC 4.7.0 or newer to compile."
#endif
#if COMPILER(GCC) && !COMPILER(CLANG)
#define WTF_COMPILER_SUPPORTS_CXX_CONSTEXPR 1
#define WTF_COMPILER_SUPPORTS_CXX_USER_LITERALS 1
#endif
#if COMPILER(GCC) && !COMPILER(CLANG) && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1
#endif
#if COMPILER(GCC) && !COMPILER(CLANG) && GCC_VERSION_AT_LEAST(4, 8, 0)
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
#if COMPILER(GCC) && !COMPILER(CLANG) && (defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L))
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#endif
#if defined(__MINGW32__)
#define WTF_COMPILER_MINGW 1
#include <_mingw.h>
#endif
#if COMPILER(MINGW) && defined(__MINGW64_VERSION_MAJOR)
#define WTF_COMPILER_MINGW64 1
#endif
#if defined(_MSC_VER)
#define WTF_COMPILER_MSVC 1
#endif
#if defined(_MSC_VER) && _MSC_VER < 1800
#error "Please use a newer version of Visual Studio. WebKit requires VS2013 or newer to compile."
#endif
#if defined(__SUNPRO_CC) || defined(__SUNPRO_C)
#define WTF_COMPILER_SUNCC 1
#endif
#if !COMPILER(CLANG) && !COMPILER(MSVC)
#define WTF_COMPILER_QUIRK_CONSIDERS_UNREACHABLE_CODE 1
#endif
#if defined(__ARM_EABI__) || defined(__EABI__)
#define WTF_COMPILER_SUPPORTS_EABI 1
#endif
#if defined(__has_feature)
#define ASAN_ENABLED __has_feature(address_sanitizer)
#else
#define ASAN_ENABLED 0
#endif
#if ASAN_ENABLED
#define SUPPRESS_ASAN __attribute__((no_sanitize_address))
#else
#define SUPPRESS_ASAN
#endif
#if !defined(ALWAYS_INLINE) && COMPILER(GCC) && defined(NDEBUG) && !COMPILER(MINGW)
#define ALWAYS_INLINE inline __attribute__((__always_inline__))
#endif
#if !defined(ALWAYS_INLINE) && COMPILER(MSVC) && defined(NDEBUG)
#define ALWAYS_INLINE __forceinline
#endif
#if !defined(ALWAYS_INLINE)
#define ALWAYS_INLINE inline
#endif
#if !defined(CONSTEXPR) && COMPILER_SUPPORTS(CXX_CONSTEXPR)
#define CONSTEXPR constexpr
#endif
#if !defined(CONSTEXPR)
#define CONSTEXPR
#endif
#ifdef __cplusplus
#define WTF_EXTERN_C_BEGIN extern "C" {
#define WTF_EXTERN_C_END }
#else
#define WTF_EXTERN_C_BEGIN
#define WTF_EXTERN_C_END
#endif
#ifdef __cplusplus
#define EXTERN_C extern "C"
#else
#define EXTERN_C extern
#endif
#if !defined(FALLTHROUGH) && COMPILER_SUPPORTS(FALLTHROUGH_WARNINGS) && COMPILER(CLANG)
#define FALLTHROUGH [[clang::fallthrough]]
#endif
#if !defined(FALLTHROUGH)
#define FALLTHROUGH
#endif
#if !defined(LIKELY) && COMPILER(GCC)
#define LIKELY(x) __builtin_expect(!!(x), 1)
#endif
#if !defined(LIKELY)
#define LIKELY(x) (x)
#endif
#if !defined(NEVER_INLINE) && COMPILER(GCC)
#define NEVER_INLINE __attribute__((__noinline__))
#endif
#if !defined(NEVER_INLINE) && COMPILER(MSVC)
#define NEVER_INLINE __declspec(noinline)
#endif
#if !defined(NEVER_INLINE)
#define NEVER_INLINE
#endif
#if !defined(NO_RETURN) && COMPILER(GCC)
#define NO_RETURN __attribute((__noreturn__))
#endif
#if !defined(NO_RETURN) && COMPILER(MSVC)
#define NO_RETURN __declspec(noreturn)
#endif
#if !defined(NO_RETURN)
#define NO_RETURN
#endif
#if !defined(NO_RETURN_WITH_VALUE) && !COMPILER(MSVC)
#define NO_RETURN_WITH_VALUE NO_RETURN
#endif
#if !defined(NO_RETURN_WITH_VALUE)
#define NO_RETURN_WITH_VALUE
#endif
#if !defined(OBJC_CLASS) && defined(__OBJC__)
#define OBJC_CLASS @class
#endif
#if !defined(OBJC_CLASS)
#define OBJC_CLASS class
#endif
#if !defined(PURE_FUNCTION) && COMPILER(GCC)
#define PURE_FUNCTION __attribute__((__pure__))
#endif
#if !defined(PURE_FUNCTION)
#define PURE_FUNCTION
#endif
#if !defined(REFERENCED_FROM_ASM) && COMPILER(GCC)
#define REFERENCED_FROM_ASM __attribute__((__used__))
#endif
#if !defined(REFERENCED_FROM_ASM)
#define REFERENCED_FROM_ASM
#endif
#if !defined(UNLIKELY) && COMPILER(GCC)
#define UNLIKELY(x) __builtin_expect(!!(x), 0)
#endif
#if !defined(UNLIKELY)
#define UNLIKELY(x) (x)
#endif
#if !defined(UNUSED_LABEL) && COMPILER(MSVC)
#define UNUSED_LABEL(label) if (false) goto label
#endif
#if !defined(UNUSED_LABEL)
#define UNUSED_LABEL(label) UNUSED_PARAM(&& label)
#endif
#if !defined(UNUSED_PARAM) && COMPILER(MSVC)
#define UNUSED_PARAM(variable) (void)&variable
#endif
#if !defined(UNUSED_PARAM)
#define UNUSED_PARAM(variable) (void)variable
#endif
#if !defined(WARN_UNUSED_RETURN) && COMPILER(GCC)
#define WARN_UNUSED_RETURN __attribute__((__warn_unused_result__))
#endif
#if !defined(WARN_UNUSED_RETURN)
#define WARN_UNUSED_RETURN
#endif
#if !defined(__has_include) && COMPILER(MSVC)
#define __has_include(path) 0
#endif
#endif