527 lines
16 KiB
C
527 lines
16 KiB
C
/*
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* Copyright (C) 2011-2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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/* COMPILER() - the compiler being used to build the project */
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#define COMPILER(WTF_FEATURE) (defined WTF_COMPILER_##WTF_FEATURE && WTF_COMPILER_##WTF_FEATURE)
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/* COMPILER_SUPPORTS() - whether the compiler being used to build the project supports the given feature. */
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#define COMPILER_SUPPORTS(WTF_COMPILER_FEATURE) (defined WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE && WTF_COMPILER_SUPPORTS_##WTF_COMPILER_FEATURE)
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/* COMPILER_QUIRK() - whether the compiler being used to build the project requires a given quirk. */
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#define COMPILER_QUIRK(WTF_COMPILER_QUIRK) (defined WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK && WTF_COMPILER_QUIRK_##WTF_COMPILER_QUIRK)
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/* COMPILER_HAS_CLANG_BUILTIN() - whether the compiler supports a particular clang builtin. */
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#ifdef __has_builtin
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#define COMPILER_HAS_CLANG_BUILTIN(x) __has_builtin(x)
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#else
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#define COMPILER_HAS_CLANG_BUILTIN(x) 0
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#endif
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/* COMPILER_HAS_CLANG_FEATURE() - whether the compiler supports a particular language or library feature. */
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/* http://clang.llvm.org/docs/LanguageExtensions.html#has-feature-and-has-extension */
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#ifdef __has_feature
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#define COMPILER_HAS_CLANG_FEATURE(x) __has_feature(x)
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#else
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#define COMPILER_HAS_CLANG_FEATURE(x) 0
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#endif
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/* COMPILER_HAS_CLANG_DECLSPEC() - whether the compiler supports a Microsoft style __declspec attribute. */
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/* https://clang.llvm.org/docs/LanguageExtensions.html#has-declspec-attribute */
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#ifdef __has_declspec_attribute
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#define COMPILER_HAS_CLANG_DECLSPEC(x) __has_declspec_attribute(x)
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#else
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#define COMPILER_HAS_CLANG_DECLSPEC(x) 0
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#endif
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/* ==== COMPILER() - primary detection of the compiler being used to build the project, in alphabetical order ==== */
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/* COMPILER(CLANG) - Clang */
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#if defined(__clang__)
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#define WTF_COMPILER_CLANG 1
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#define WTF_COMPILER_SUPPORTS_BLOCKS COMPILER_HAS_CLANG_FEATURE(blocks)
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#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT COMPILER_HAS_CLANG_FEATURE(c_static_assert)
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#define WTF_COMPILER_SUPPORTS_CXX_EXCEPTIONS COMPILER_HAS_CLANG_FEATURE(cxx_exceptions)
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#define WTF_COMPILER_SUPPORTS_BUILTIN_IS_TRIVIALLY_COPYABLE COMPILER_HAS_CLANG_FEATURE(is_trivially_copyable)
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#ifdef __cplusplus
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#if __cplusplus <= 201103L
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#define WTF_CPP_STD_VER 11
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#elif __cplusplus <= 201402L
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#define WTF_CPP_STD_VER 14
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#elif __cplusplus <= 201703L
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#define WTF_CPP_STD_VER 17
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#endif
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#endif
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#endif // defined(__clang__)
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/* COMPILER(GCC_COMPATIBLE) - GNU Compiler Collection or compatibles */
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#if defined(__GNUC__)
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#define WTF_COMPILER_GCC_COMPATIBLE 1
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#endif
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/* COMPILER(GCC) - GNU Compiler Collection */
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/* Note: This section must come after the Clang section since we check !COMPILER(CLANG) here. */
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#if COMPILER(GCC_COMPATIBLE) && !COMPILER(CLANG)
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#define WTF_COMPILER_GCC 1
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#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
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#define GCC_VERSION_AT_LEAST(major, minor, patch) (GCC_VERSION >= (major * 10000 + minor * 100 + patch))
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#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
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#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1
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#endif
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#endif /* COMPILER(GCC) */
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#if COMPILER(GCC_COMPATIBLE) && defined(NDEBUG) && !defined(__OPTIMIZE__) && !defined(RELEASE_WITHOUT_OPTIMIZATIONS)
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#error "Building release without compiler optimizations: WebKit will be slow. Set -DRELEASE_WITHOUT_OPTIMIZATIONS if this is intended."
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#endif
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/* COMPILER(MINGW) - MinGW GCC */
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#if defined(__MINGW32__)
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#define WTF_COMPILER_MINGW 1
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#include <_mingw.h>
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#endif
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/* COMPILER(MINGW64) - mingw-w64 GCC - used as additional check to exclude mingw.org specific functions */
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/* Note: This section must come after the MinGW section since we check COMPILER(MINGW) here. */
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#if COMPILER(MINGW) && defined(__MINGW64_VERSION_MAJOR) /* best way to check for mingw-w64 vs mingw.org */
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#define WTF_COMPILER_MINGW64 1
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#endif
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/* COMPILER(MSVC) - Microsoft Visual C++ */
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#if defined(_MSC_VER)
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#define WTF_COMPILER_MSVC 1
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#if _MSC_VER < 1910
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#error "Please use a newer version of Visual Studio. WebKit requires VS2017 or newer to compile."
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#endif
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#endif
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#if !COMPILER(CLANG) && !COMPILER(MSVC)
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#define WTF_COMPILER_QUIRK_CONSIDERS_UNREACHABLE_CODE 1
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#endif
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/* ==== COMPILER_SUPPORTS - additional compiler feature detection, in alphabetical order ==== */
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/* COMPILER_SUPPORTS(EABI) */
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#if defined(__ARM_EABI__) || defined(__EABI__)
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#define WTF_COMPILER_SUPPORTS_EABI 1
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#endif
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/* ASAN_ENABLED and SUPPRESS_ASAN */
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#ifdef __SANITIZE_ADDRESS__
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#define ASAN_ENABLED 1
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#else
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#define ASAN_ENABLED COMPILER_HAS_CLANG_FEATURE(address_sanitizer)
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#endif
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#if ASAN_ENABLED
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#define SUPPRESS_ASAN __attribute__((no_sanitize_address))
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#else
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#define SUPPRESS_ASAN
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#endif
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/* TSAN_ENABLED and SUPPRESS_TSAN */
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#ifdef __SANITIZE_THREAD__
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#define TSAN_ENABLED 1
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#else
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#define TSAN_ENABLED COMPILER_HAS_CLANG_FEATURE(thread_sanitizer)
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#endif
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#if TSAN_ENABLED
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#define SUPPRESS_TSAN __attribute__((no_sanitize_thread))
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#else
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#define SUPPRESS_TSAN
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#endif
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/* ==== Compiler-independent macros for various compiler features, in alphabetical order ==== */
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/* ALWAYS_INLINE */
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/* In GCC functions marked with no_sanitize_address cannot call functions that are marked with always_inline and not marked with no_sanitize_address.
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* Therefore we need to give up on the enforcement of ALWAYS_INLINE when bulding with ASAN. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 */
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#if !defined(ALWAYS_INLINE) && COMPILER(GCC_COMPATIBLE) && defined(NDEBUG) && !COMPILER(MINGW) && !(COMPILER(GCC) && ASAN_ENABLED)
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#define ALWAYS_INLINE inline __attribute__((__always_inline__))
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#endif
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#if !defined(ALWAYS_INLINE) && COMPILER(MSVC) && defined(NDEBUG)
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#define ALWAYS_INLINE __forceinline
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#endif
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#if !defined(ALWAYS_INLINE)
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#define ALWAYS_INLINE inline
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#endif
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#if COMPILER(MSVC)
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#define ALWAYS_INLINE_EXCEPT_MSVC inline
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#else
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#define ALWAYS_INLINE_EXCEPT_MSVC ALWAYS_INLINE
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#endif
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/* WTF_EXTERN_C_{BEGIN, END} */
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#ifdef __cplusplus
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#define WTF_EXTERN_C_BEGIN extern "C" {
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#define WTF_EXTERN_C_END }
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#else
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#define WTF_EXTERN_C_BEGIN
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#define WTF_EXTERN_C_END
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#endif
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/* FALLTHROUGH */
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#if !defined(FALLTHROUGH) && defined(__cplusplus) && defined(__has_cpp_attribute)
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#if __has_cpp_attribute(fallthrough)
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#define FALLTHROUGH [[fallthrough]]
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#elif __has_cpp_attribute(clang::fallthrough)
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#define FALLTHROUGH [[clang::fallthrough]]
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#elif __has_cpp_attribute(gnu::fallthrough)
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#define FALLTHROUGH [[gnu::fallthrough]]
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#endif
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#elif !defined(FALLTHROUGH) && !defined(__cplusplus)
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#if COMPILER(GCC_COMPATIBLE) && defined(__has_attribute)
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// Break out this #if to satisy some versions Windows compilers.
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#if __has_attribute(fallthrough)
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#define FALLTHROUGH __attribute__ ((fallthrough))
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#endif
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#endif
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#endif // !defined(FALLTHROUGH) && defined(__cplusplus) && defined(__has_cpp_attribute)
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#if !defined(FALLTHROUGH)
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#define FALLTHROUGH
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#endif
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/* LIKELY */
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#if !defined(LIKELY) && COMPILER(GCC_COMPATIBLE)
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#define LIKELY(x) __builtin_expect(!!(x), 1)
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#endif
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#if !defined(LIKELY)
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#define LIKELY(x) (x)
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#endif
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/* NEVER_INLINE */
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#if !defined(NEVER_INLINE) && COMPILER(GCC_COMPATIBLE)
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#define NEVER_INLINE __attribute__((__noinline__))
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#endif
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#if !defined(NEVER_INLINE) && COMPILER(MSVC)
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#define NEVER_INLINE __declspec(noinline)
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#endif
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#if !defined(NEVER_INLINE)
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#define NEVER_INLINE
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#endif
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/* NO_RETURN */
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#if !defined(NO_RETURN) && COMPILER(GCC_COMPATIBLE)
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#define NO_RETURN __attribute((__noreturn__))
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#endif
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#if !defined(NO_RETURN) && COMPILER(MSVC)
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#define NO_RETURN __declspec(noreturn)
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#endif
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#if !defined(NO_RETURN)
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#define NO_RETURN
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#endif
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/* NOT_TAIL_CALLED */
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#if !defined(NOT_TAIL_CALLED) && defined(__has_attribute)
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#if __has_attribute(not_tail_called)
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#define NOT_TAIL_CALLED __attribute__((not_tail_called))
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#endif
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#endif
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#if !defined(NOT_TAIL_CALLED)
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#define NOT_TAIL_CALLED
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#endif
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/* RETURNS_NONNULL */
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#if !defined(RETURNS_NONNULL) && COMPILER(GCC_COMPATIBLE)
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#define RETURNS_NONNULL __attribute__((returns_nonnull))
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#endif
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#if !defined(RETURNS_NONNULL)
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#define RETURNS_NONNULL
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#endif
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/* NO_RETURN_WITH_VALUE */
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#if !defined(NO_RETURN_WITH_VALUE) && !COMPILER(MSVC)
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#define NO_RETURN_WITH_VALUE NO_RETURN
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#endif
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#if !defined(NO_RETURN_WITH_VALUE)
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#define NO_RETURN_WITH_VALUE
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#endif
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/* OBJC_CLASS */
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#if !defined(OBJC_CLASS) && defined(__OBJC__)
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#define OBJC_CLASS @class
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#endif
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#if !defined(OBJC_CLASS)
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#define OBJC_CLASS class
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#endif
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/* OBJC_PROTOCOL */
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#if !defined(OBJC_PROTOCOL) && defined(__OBJC__)
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/* This forward-declares a protocol, then also creates a type of the same name based on NSObject.
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* This allows us to use "NSObject<MyProtocol> *" or "MyProtocol *" more-or-less interchangably. */
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#define OBJC_PROTOCOL(protocolName) @protocol protocolName; using protocolName = NSObject<protocolName>
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#endif
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#if !defined(OBJC_PROTOCOL)
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#define OBJC_PROTOCOL(protocolName) class protocolName
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#endif
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/* PURE_FUNCTION */
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#if !defined(PURE_FUNCTION) && COMPILER(GCC_COMPATIBLE)
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#define PURE_FUNCTION __attribute__((__pure__))
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#endif
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#if !defined(PURE_FUNCTION)
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#define PURE_FUNCTION
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#endif
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/* WK_UNUSED_INSTANCE_VARIABLE */
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#if !defined(WK_UNUSED_INSTANCE_VARIABLE) && COMPILER(GCC_COMPATIBLE)
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#define WK_UNUSED_INSTANCE_VARIABLE __attribute__((unused))
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#endif
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#if !defined(WK_UNUSED_INSTANCE_VARIABLE)
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#define WK_UNUSED_INSTANCE_VARIABLE
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#endif
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/* UNUSED_FUNCTION */
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#if !defined(UNUSED_FUNCTION) && COMPILER(GCC_COMPATIBLE)
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#define UNUSED_FUNCTION __attribute__((unused))
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#endif
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#if !defined(UNUSED_FUNCTION)
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#define UNUSED_FUNCTION
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#endif
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/* UNUSED_TYPE_ALIAS */
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#if !defined(UNUSED_TYPE_ALIAS) && COMPILER(GCC_COMPATIBLE)
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#define UNUSED_TYPE_ALIAS __attribute__((unused))
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#endif
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#if !defined(UNUSED_TYPE_ALIAS)
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#define UNUSED_TYPE_ALIAS
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#endif
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/* REFERENCED_FROM_ASM */
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#if !defined(REFERENCED_FROM_ASM) && COMPILER(GCC_COMPATIBLE)
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#define REFERENCED_FROM_ASM __attribute__((__used__))
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#endif
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#if !defined(REFERENCED_FROM_ASM)
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#define REFERENCED_FROM_ASM
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#endif
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/* UNLIKELY */
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#if !defined(UNLIKELY) && COMPILER(GCC_COMPATIBLE)
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#define UNLIKELY(x) __builtin_expect(!!(x), 0)
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#endif
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#if !defined(UNLIKELY)
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#define UNLIKELY(x) (x)
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#endif
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/* UNUSED_LABEL */
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/* Keep the compiler from complaining for a local label that is defined but not referenced. */
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/* Helpful when mixing hand-written and autogenerated code. */
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#if !defined(UNUSED_LABEL) && COMPILER(MSVC)
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#define UNUSED_LABEL(label) if (false) goto label
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#endif
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#if !defined(UNUSED_LABEL)
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#define UNUSED_LABEL(label) UNUSED_PARAM(&& label)
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#endif
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/* UNUSED_PARAM */
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#if !defined(UNUSED_PARAM)
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#define UNUSED_PARAM(variable) (void)variable
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#endif
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/* UNUSED_VARIABLE */
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#if !defined(UNUSED_VARIABLE)
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#define UNUSED_VARIABLE(variable) UNUSED_PARAM(variable)
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#endif
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/* WARN_UNUSED_RETURN */
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#if !defined(WARN_UNUSED_RETURN) && COMPILER(GCC_COMPATIBLE)
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#define WARN_UNUSED_RETURN __attribute__((__warn_unused_result__))
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#endif
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#if !defined(WARN_UNUSED_RETURN)
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#define WARN_UNUSED_RETURN
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#endif
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/* DEBUGGER_ANNOTATION_MARKER */
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#if !defined(DEBUGGER_ANNOTATION_MARKER) && COMPILER(GCC)
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#define DEBUGGER_ANNOTATION_MARKER(name) \
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__attribute__((__no_reorder__)) void name(void) { __asm__(""); }
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#endif
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#if !defined(DEBUGGER_ANNOTATION_MARKER)
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#define DEBUGGER_ANNOTATION_MARKER(name)
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#endif
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#if !defined(__has_include) && COMPILER(MSVC)
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#define __has_include(path) 0
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#endif
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/* IGNORE_WARNINGS */
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/* Can't use WTF_CONCAT() and STRINGIZE() because they are defined in
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* StdLibExtras.h, which includes this file. */
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#define _COMPILER_CONCAT_I(a, b) a ## b
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#define _COMPILER_CONCAT(a, b) _COMPILER_CONCAT_I(a, b)
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#define _COMPILER_STRINGIZE(exp) #exp
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#define _COMPILER_WARNING_NAME(warning) "-W" warning
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#if COMPILER(GCC) || COMPILER(CLANG)
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#define IGNORE_WARNINGS_BEGIN_COND(cond, compiler, warning) \
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_Pragma(_COMPILER_STRINGIZE(compiler diagnostic push)) \
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_COMPILER_CONCAT(IGNORE_WARNINGS_BEGIN_IMPL_, cond)(compiler, warning)
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#define IGNORE_WARNINGS_BEGIN_IMPL_1(compiler, warning) \
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_Pragma(_COMPILER_STRINGIZE(compiler diagnostic ignored warning))
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#define IGNORE_WARNINGS_BEGIN_IMPL_0(compiler, warning)
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#define IGNORE_WARNINGS_BEGIN_IMPL_(compiler, warning)
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#define IGNORE_WARNINGS_END_IMPL(compiler) _Pragma(_COMPILER_STRINGIZE(compiler diagnostic pop))
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#if defined(__has_warning)
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#define _IGNORE_WARNINGS_BEGIN_IMPL(compiler, warning) \
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IGNORE_WARNINGS_BEGIN_COND(__has_warning(warning), compiler, warning)
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#else
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#define _IGNORE_WARNINGS_BEGIN_IMPL(compiler, warning) IGNORE_WARNINGS_BEGIN_COND(1, compiler, warning)
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#endif
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#define IGNORE_WARNINGS_BEGIN_IMPL(compiler, warning) \
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_IGNORE_WARNINGS_BEGIN_IMPL(compiler, _COMPILER_WARNING_NAME(warning))
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#endif // COMPILER(GCC) || COMPILER(CLANG)
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#if COMPILER(GCC)
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#define IGNORE_GCC_WARNINGS_BEGIN(warning) IGNORE_WARNINGS_BEGIN_IMPL(GCC, warning)
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#define IGNORE_GCC_WARNINGS_END IGNORE_WARNINGS_END_IMPL(GCC)
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#else
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#define IGNORE_GCC_WARNINGS_BEGIN(warning)
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#define IGNORE_GCC_WARNINGS_END
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#endif
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#if COMPILER(CLANG)
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#define IGNORE_CLANG_WARNINGS_BEGIN(warning) IGNORE_WARNINGS_BEGIN_IMPL(clang, warning)
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#define IGNORE_CLANG_WARNINGS_END IGNORE_WARNINGS_END_IMPL(clang)
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#else
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#define IGNORE_CLANG_WARNINGS_BEGIN(warning)
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#define IGNORE_CLANG_WARNINGS_END
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#endif
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#if COMPILER(GCC) || COMPILER(CLANG)
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#define IGNORE_WARNINGS_BEGIN(warning) IGNORE_WARNINGS_BEGIN_IMPL(GCC, warning)
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#define IGNORE_WARNINGS_END IGNORE_WARNINGS_END_IMPL(GCC)
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#else
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#define IGNORE_WARNINGS_BEGIN(warning)
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#define IGNORE_WARNINGS_END
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#endif
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#define ALLOW_DEPRECATED_DECLARATIONS_BEGIN IGNORE_WARNINGS_BEGIN("deprecated-declarations")
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#define ALLOW_DEPRECATED_DECLARATIONS_END IGNORE_WARNINGS_END
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#define ALLOW_DEPRECATED_IMPLEMENTATIONS_BEGIN IGNORE_WARNINGS_BEGIN("deprecated-implementations")
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#define ALLOW_DEPRECATED_IMPLEMENTATIONS_END IGNORE_WARNINGS_END
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#define ALLOW_NEW_API_WITHOUT_GUARDS_BEGIN IGNORE_CLANG_WARNINGS_BEGIN("unguarded-availability-new")
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#define ALLOW_NEW_API_WITHOUT_GUARDS_END IGNORE_CLANG_WARNINGS_END
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#define ALLOW_UNUSED_PARAMETERS_BEGIN IGNORE_WARNINGS_BEGIN("unused-parameter")
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#define ALLOW_UNUSED_PARAMETERS_END IGNORE_WARNINGS_END
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#define ALLOW_NONLITERAL_FORMAT_BEGIN IGNORE_WARNINGS_BEGIN("format-nonliteral")
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#define ALLOW_NONLITERAL_FORMAT_END IGNORE_WARNINGS_END
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#define IGNORE_RETURN_TYPE_WARNINGS_BEGIN IGNORE_WARNINGS_BEGIN("return-type")
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#define IGNORE_RETURN_TYPE_WARNINGS_END IGNORE_WARNINGS_END
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#define IGNORE_NULL_CHECK_WARNINGS_BEGIN IGNORE_WARNINGS_BEGIN("nonnull")
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#define IGNORE_NULL_CHECK_WARNINGS_END IGNORE_WARNINGS_END
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/* NO_UNIQUE_ADDRESS */
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#if !defined(NO_UNIQUE_ADDRESS) && defined(__has_cpp_attribute)
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#if __has_cpp_attribute(no_unique_address)
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#define NO_UNIQUE_ADDRESS [[no_unique_address]] // NOLINT: check-webkit-style does not understand annotations.
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#endif
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#endif
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#if !defined(NO_UNIQUE_ADDRESS)
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#define NO_UNIQUE_ADDRESS
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#endif
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