Source/wtf/Compiler.h - platform/external/chromium_org/third_party/WebKit - Git at Google

 /*
  * 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

 #define CLANG_PRAGMA(PRAGMA) _Pragma(PRAGMA)

 /* Specific compiler features */
 #define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES __has_extension(cxx_variadic_templates)

 /* There is a bug in clang that comes with Xcode 4.2 where AtomicStrings can't be implicitly converted to Strings
    in the presence of move constructors and/or move assignment operators. This bug has been fixed in Xcode 4.3 clang, so we
    check for both cxx_rvalue_references as well as the unrelated cxx_nonstatic_member_init feature which we know was added in 4.3 */
 #define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES __has_extension(cxx_rvalue_references) && __has_extension(cxx_nonstatic_member_init)

 #define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS __has_extension(cxx_deleted_functions)
 #define WTF_COMPILER_SUPPORTS_CXX_NULLPTR __has_feature(cxx_nullptr)
 #define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS __has_feature(cxx_explicit_conversions)
 #define WTF_COMPILER_SUPPORTS_BLOCKS __has_feature(blocks)
 #define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT __has_extension(c_static_assert)
 #define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT __has_extension(cxx_static_assert)
 #define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL __has_extension(cxx_override_control)
 #define WTF_COMPILER_SUPPORTS_HAS_TRIVIAL_DESTRUCTOR __has_extension(has_trivial_destructor)
 #define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS __has_extension(cxx_strong_enums)

 #endif

 #ifndef CLANG_PRAGMA
 #define CLANG_PRAGMA(PRAGMA)
 #endif

 /* COMPILER(MSVC) - Microsoft Visual C++ */
 #if defined(_MSC_VER)
 #define WTF_COMPILER_MSVC 1

 /* Specific compiler features */
 #if !COMPILER(CLANG) && _MSC_VER >= 1600
 #define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1
 #endif

 #if !COMPILER(CLANG)
 #define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1
 #define WTF_COMPILER_QUIRK_FINAL_IS_CALLED_SEALED 1
 #endif

 #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)
 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
 /* C11 support */
 #define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1
 #endif
 #if defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L)
 /* C++11 support */
 #if GCC_VERSION_AT_LEAST(4, 3, 0)
 #define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES 1
 #define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT 1
 #define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES 1
 #endif
 #if GCC_VERSION_AT_LEAST(4, 4, 0)
 #define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS 1
 #endif
 #if GCC_VERSION_AT_LEAST(4, 5, 0)
 #define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS 1
 #endif
 #if GCC_VERSION_AT_LEAST(4, 6, 0)
 #define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1
 /* Strong enums should work from gcc 4.4, but doesn't seem to support some operators */
 #define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS 1
 #endif
 #if GCC_VERSION_AT_LEAST(4, 7, 0)
 #define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1
 #endif
 #endif /* defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L) */
 #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__))
 #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


 /* NO_RETURN_WITH_VALUE */

 #ifndef NO_RETURN_WITH_VALUE
 #if !COMPILER(MSVC)
 #define NO_RETURN_WITH_VALUE NO_RETURN
 #else
 #define NO_RETURN_WITH_VALUE
 #endif
 #endif


 /* WARN_UNUSED_RETURN */

 #if COMPILER(GCC)
 #define WARN_UNUSED_RETURN __attribute__ ((warn_unused_result))
 #else
 #define WARN_UNUSED_RETURN
 #endif

 /* OVERRIDE and FINAL */

 #if COMPILER_SUPPORTS(CXX_OVERRIDE_CONTROL)
 #define OVERRIDE override

 #if COMPILER_QUIRK(FINAL_IS_CALLED_SEALED)
 #define FINAL sealed
 #else
 #define FINAL final
 #endif

 #else
 #define OVERRIDE
 #define FINAL
 #endif

 /* WTF_DELETED_FUNCTION */

 #if COMPILER_SUPPORTS(CXX_DELETED_FUNCTIONS)
 #define WTF_DELETED_FUNCTION = delete
 #else
 #define WTF_DELETED_FUNCTION
 #endif

 /* 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

 /* ABI */
 #if defined(__ARM_EABI__) || defined(__EABI__)
 #define WTF_COMPILER_SUPPORTS_EABI 1
 #endif

 #endif /* WTF_Compiler_h */
	/*
	* 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

	#define CLANG_PRAGMA(PRAGMA) _Pragma(PRAGMA)

	/* Specific compiler features */
	#define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES __has_extension(cxx_variadic_templates)

	/* There is a bug in clang that comes with Xcode 4.2 where AtomicStrings can't be implicitly converted to Strings
	in the presence of move constructors and/or move assignment operators. This bug has been fixed in Xcode 4.3 clang, so we
	check for both cxx_rvalue_references as well as the unrelated cxx_nonstatic_member_init feature which we know was added in 4.3 */
	#define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES __has_extension(cxx_rvalue_references) && __has_extension(cxx_nonstatic_member_init)

	#define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS __has_extension(cxx_deleted_functions)
	#define WTF_COMPILER_SUPPORTS_CXX_NULLPTR __has_feature(cxx_nullptr)
	#define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS __has_feature(cxx_explicit_conversions)
	#define WTF_COMPILER_SUPPORTS_BLOCKS __has_feature(blocks)
	#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT __has_extension(c_static_assert)
	#define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT __has_extension(cxx_static_assert)
	#define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL __has_extension(cxx_override_control)
	#define WTF_COMPILER_SUPPORTS_HAS_TRIVIAL_DESTRUCTOR __has_extension(has_trivial_destructor)
	#define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS __has_extension(cxx_strong_enums)

	#endif

	#ifndef CLANG_PRAGMA
	#define CLANG_PRAGMA(PRAGMA)
	#endif

	/* COMPILER(MSVC) - Microsoft Visual C++ */
	#if defined(_MSC_VER)
	#define WTF_COMPILER_MSVC 1

	/* Specific compiler features */
	#if !COMPILER(CLANG) && _MSC_VER >= 1600
	#define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1
	#endif

	#if !COMPILER(CLANG)
	#define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1
	#define WTF_COMPILER_QUIRK_FINAL_IS_CALLED_SEALED 1
	#endif

	#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)
	#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
	/* C11 support */
	#define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT 1
	#endif
	#if defined(__GXX_EXPERIMENTAL_CXX0X__) \|\| (defined(__cplusplus) && __cplusplus >= 201103L)
	/* C++11 support */
	#if GCC_VERSION_AT_LEAST(4, 3, 0)
	#define WTF_COMPILER_SUPPORTS_CXX_RVALUE_REFERENCES 1
	#define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT 1
	#define WTF_COMPILER_SUPPORTS_CXX_VARIADIC_TEMPLATES 1
	#endif
	#if GCC_VERSION_AT_LEAST(4, 4, 0)
	#define WTF_COMPILER_SUPPORTS_CXX_DELETED_FUNCTIONS 1
	#endif
	#if GCC_VERSION_AT_LEAST(4, 5, 0)
	#define WTF_COMPILER_SUPPORTS_CXX_EXPLICIT_CONVERSIONS 1
	#endif
	#if GCC_VERSION_AT_LEAST(4, 6, 0)
	#define WTF_COMPILER_SUPPORTS_CXX_NULLPTR 1
	/* Strong enums should work from gcc 4.4, but doesn't seem to support some operators */
	#define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS 1
	#endif
	#if GCC_VERSION_AT_LEAST(4, 7, 0)
	#define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1
	#endif
	#endif /* defined(__GXX_EXPERIMENTAL_CXX0X__) \|\| (defined(__cplusplus) && __cplusplus >= 201103L) */
	#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__))
	#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


	/* NO_RETURN_WITH_VALUE */

	#ifndef NO_RETURN_WITH_VALUE
	#if !COMPILER(MSVC)
	#define NO_RETURN_WITH_VALUE NO_RETURN
	#else
	#define NO_RETURN_WITH_VALUE
	#endif
	#endif


	/* WARN_UNUSED_RETURN */

	#if COMPILER(GCC)
	#define WARN_UNUSED_RETURN __attribute__ ((warn_unused_result))
	#else
	#define WARN_UNUSED_RETURN
	#endif

	/* OVERRIDE and FINAL */

	#if COMPILER_SUPPORTS(CXX_OVERRIDE_CONTROL)
	#define OVERRIDE override

	#if COMPILER_QUIRK(FINAL_IS_CALLED_SEALED)
	#define FINAL sealed
	#else
	#define FINAL final
	#endif

	#else
	#define OVERRIDE
	#define FINAL
	#endif

	/* WTF_DELETED_FUNCTION */

	#if COMPILER_SUPPORTS(CXX_DELETED_FUNCTIONS)
	#define WTF_DELETED_FUNCTION = delete
	#else
	#define WTF_DELETED_FUNCTION
	#endif

	/* 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

	/* ABI */
	#if defined(__ARM_EABI__) \|\| defined(__EABI__)
	#define WTF_COMPILER_SUPPORTS_EABI 1
	#endif

	#endif /* WTF_Compiler_h */