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darling-WTF/wtf/Compiler.h
Andrew Hyatt 0a81a832a1 Update WTF to the Hgih Sierra version
2018-01-05 13:44:16 -08:00

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/*
* Copyright (C) 2011, 2012, 2014 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_HAS_CLANG_BUILTIN() - whether the compiler supports a particular clang builtin. */
#ifdef __has_builtin
#define COMPILER_HAS_CLANG_BUILTIN(x) __has_builtin(x)
#else
#define COMPILER_HAS_CLANG_BUILTIN(x) 0
#endif
/* COMPILER_HAS_CLANG_HEATURE() - whether the compiler supports a particular language or library feature. */
/* http://clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension */
#ifdef __has_feature
#define COMPILER_HAS_CLANG_FEATURE(x) __has_feature(x)
#else
#define COMPILER_HAS_CLANG_FEATURE(x) 0
#endif
/* COMPILER_HAS_CLANG_DECLSPEC() - whether the compiler supports a Microsoft style __declspec attribute. */
/* https://clang.llvm.org/docs/LanguageExtensions.html#has-declspec-attribute */
#ifdef __has_declspec_attribute
#define COMPILER_HAS_CLANG_DECLSPEC(x) __has_declspec_attribute(x)
#else
#define COMPILER_HAS_CLANG_DECLSPEC(x) 0
#endif
/* ==== COMPILER() - primary detection of the compiler being used to build the project, in alphabetical order ==== */
/* COMPILER(CLANG) - Clang */
#if defined(__clang__)
#define WTF_COMPILER_CLANG 1
#define WTF_COMPILER_SUPPORTS_BLOCKS COMPILER_HAS_CLANG_FEATURE(blocks)
#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT COMPILER_HAS_CLANG_FEATURE(c_static_assert)
#define WTF_COMPILER_SUPPORTS_CXX_REFERENCE_QUALIFIED_FUNCTIONS COMPILER_HAS_CLANG_FEATURE(cxx_reference_qualified_functions)
#define WTF_COMPILER_SUPPORTS_CXX_EXCEPTIONS COMPILER_HAS_CLANG_FEATURE(cxx_exceptions)
#define WTF_COMPILER_SUPPORTS_BUILTIN_IS_TRIVIALLY_COPYABLE COMPILER_HAS_CLANG_FEATURE(is_trivially_copyable)
#ifdef __cplusplus
#if __cplusplus <= 201103L
#define WTF_CPP_STD_VER 11
#elif __cplusplus <= 201402L
#define WTF_CPP_STD_VER 14
#endif
#endif
#endif // defined(__clang__)
/* COMPILER(GCC_OR_CLANG) - GNU Compiler Collection or Clang */
#if defined(__GNUC__)
#define WTF_COMPILER_GCC_OR_CLANG 1
#endif
/* COMPILER(GCC) - GNU Compiler Collection */
/* Note: This section must come after the Clang section since we check !COMPILER(CLANG) here. */
#if COMPILER(GCC_OR_CLANG) && !COMPILER(CLANG)
#define WTF_COMPILER_GCC 1
#define WTF_COMPILER_SUPPORTS_CXX_REFERENCE_QUALIFIED_FUNCTIONS 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))
#if !GCC_VERSION_AT_LEAST(5, 0, 0)
#error "Please use a newer version of GCC. WebKit requires GCC 5.0.0 or newer to compile."
#endif
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1
#endif
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif /* COMPILER(GCC) */
/* COMPILER(MINGW) - MinGW GCC */
#if defined(__MINGW32__)
#define WTF_COMPILER_MINGW 1
#include <_mingw.h>
#endif
/* COMPILER(MINGW64) - mingw-w64 GCC - used as additional check to exclude mingw.org specific functions */
/* Note: This section must come after the MinGW section since we check COMPILER(MINGW) here. */
#if COMPILER(MINGW) && defined(__MINGW64_VERSION_MAJOR) /* best way to check for mingw-w64 vs mingw.org */
#define WTF_COMPILER_MINGW64 1
#endif
/* COMPILER(MSVC) - Microsoft Visual C++ */
#if defined(_MSC_VER)
#define WTF_COMPILER_MSVC 1
#define WTF_COMPILER_SUPPORTS_CXX_REFERENCE_QUALIFIED_FUNCTIONS 1
#if _MSC_VER < 1900
#error "Please use a newer version of Visual Studio. WebKit requires VS2015 or newer to compile."
#endif
#endif
/* COMPILER(SUNCC) */
#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
/* ==== COMPILER_SUPPORTS - additional compiler feature detection, in alphabetical order ==== */
/* COMPILER_SUPPORTS(EABI) */
#if defined(__ARM_EABI__) || defined(__EABI__)
#define WTF_COMPILER_SUPPORTS_EABI 1
#endif
/* RELAXED_CONSTEXPR */
#if defined(__cpp_constexpr) && __cpp_constexpr >= 201304
#define WTF_COMPILER_SUPPORTS_RELAXED_CONSTEXPR 1
#endif
#if !defined(RELAXED_CONSTEXPR)
#if COMPILER_SUPPORTS(RELAXED_CONSTEXPR)
#define RELAXED_CONSTEXPR constexpr
#else
#define RELAXED_CONSTEXPR
#endif
#endif
#define ASAN_ENABLED COMPILER_HAS_CLANG_FEATURE(address_sanitizer)
#if ASAN_ENABLED
#define SUPPRESS_ASAN __attribute__((no_sanitize_address))
#else
#define SUPPRESS_ASAN
#endif
/* ==== Compiler-independent macros for various compiler features, in alphabetical order ==== */
/* ALWAYS_INLINE */
#if !defined(ALWAYS_INLINE) && COMPILER(GCC_OR_CLANG) && 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
/* WTF_EXTERN_C_{BEGIN, END} */
#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
/* FALLTHROUGH */
#if !defined(FALLTHROUGH) && defined(__cplusplus) && defined(__has_cpp_attribute)
#if __has_cpp_attribute(fallthrough)
#define FALLTHROUGH [[fallthrough]]
#elif __has_cpp_attribute(clang::fallthrough)
#define FALLTHROUGH [[clang::fallthrough]]
#elif __has_cpp_attribute(gnu::fallthrough)
#define FALLTHROUGH [[gnu::fallthrough]]
#endif
#endif // !defined(FALLTHROUGH) && defined(__cplusplus) && defined(__has_cpp_attribute)
#if !defined(FALLTHROUGH)
#define FALLTHROUGH
#endif
/* LIKELY */
#if !defined(LIKELY) && COMPILER(GCC_OR_CLANG)
#define LIKELY(x) __builtin_expect(!!(x), 1)
#endif
#if !defined(LIKELY)
#define LIKELY(x) (x)
#endif
/* NEVER_INLINE */
#if !defined(NEVER_INLINE) && COMPILER(GCC_OR_CLANG)
#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
/* NO_RETURN */
#if !defined(NO_RETURN) && COMPILER(GCC_OR_CLANG)
#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
/* NOT_TAIL_CALLED */
#if !defined(NOT_TAIL_CALLED) && defined(__has_attribute)
#if __has_attribute(not_tail_called)
#define NOT_TAIL_CALLED __attribute__((not_tail_called))
#endif
#endif
#if !defined(NOT_TAIL_CALLED)
#define NOT_TAIL_CALLED
#endif
/* RETURNS_NONNULL */
#if !defined(RETURNS_NONNULL) && COMPILER(GCC_OR_CLANG)
#define RETURNS_NONNULL __attribute__((returns_nonnull))
#endif
#if !defined(RETURNS_NONNULL)
#define RETURNS_NONNULL
#endif
/* NO_RETURN_WITH_VALUE */
#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
/* OBJC_CLASS */
#if !defined(OBJC_CLASS) && defined(__OBJC__)
#define OBJC_CLASS @class
#endif
#if !defined(OBJC_CLASS)
#define OBJC_CLASS class
#endif
/* PURE_FUNCTION */
#if !defined(PURE_FUNCTION) && COMPILER(GCC_OR_CLANG)
#define PURE_FUNCTION __attribute__((__pure__))
#endif
#if !defined(PURE_FUNCTION)
#define PURE_FUNCTION
#endif
/* UNUSED_FUNCTION */
#if !defined(UNUSED_FUNCTION) && COMPILER(GCC_OR_CLANG)
#define UNUSED_FUNCTION __attribute__((unused))
#endif
#if !defined(UNUSED_FUNCTION)
#define UNUSED_FUNCTION
#endif
/* REFERENCED_FROM_ASM */
#if !defined(REFERENCED_FROM_ASM) && COMPILER(GCC_OR_CLANG)
#define REFERENCED_FROM_ASM __attribute__((__used__))
#endif
#if !defined(REFERENCED_FROM_ASM)
#define REFERENCED_FROM_ASM
#endif
/* UNLIKELY */
#if !defined(UNLIKELY) && COMPILER(GCC_OR_CLANG)
#define UNLIKELY(x) __builtin_expect(!!(x), 0)
#endif
#if !defined(UNLIKELY)
#define UNLIKELY(x) (x)
#endif
/* UNUSED_LABEL */
/* Keep the compiler from complaining for a local label that is defined but not referenced. */
/* Helpful when mixing hand-written and autogenerated code. */
#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
/* UNUSED_PARAM */
#if !defined(UNUSED_PARAM) && COMPILER(MSVC)
#define UNUSED_PARAM(variable) (void)&variable
#endif
#if !defined(UNUSED_PARAM)
#define UNUSED_PARAM(variable) (void)variable
#endif
/* WARN_UNUSED_RETURN */
#if !defined(WARN_UNUSED_RETURN) && COMPILER(GCC_OR_CLANG)
#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 /* WTF_Compiler_h */
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