faux-folly/folly/Portability.h - nest-cam/4320010/faux-folly - Git at Google

 /*
  * Copyright 2015 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *   http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef FOLLY_PORTABILITY_H_
 #define FOLLY_PORTABILITY_H_

 #include <cstddef>

 #ifndef FOLLY_NO_CONFIG
 #include <folly/folly-config.h>
 #endif

 #ifdef FOLLY_PLATFORM_CONFIG
 #include FOLLY_PLATFORM_CONFIG
 #endif

 #if FOLLY_HAVE_FEATURES_H
 #include <features.h>
 #endif

 #include <folly/CPortability.h>

 #ifdef __APPLE__
 # include <malloc/malloc.h>
 #endif

 #if FOLLY_HAVE_SCHED_H
  #include <sched.h>
  #ifndef FOLLY_HAVE_PTHREAD_YIELD
   #define pthread_yield sched_yield
  #endif
 #endif

 // A change in folly/MemoryMapping.cpp uses MAP_ANONYMOUS, which is named
 // MAP_ANON on OSX/BSD.
 #if defined(__APPLE__) || defined(__FreeBSD__)
   #include <sys/mman.h>
   #ifndef MAP_ANONYMOUS
     #ifdef MAP_ANON
       #define MAP_ANONYMOUS MAP_ANON
     #endif
   #endif
 #endif

 // compiler specific attribute translation
 // msvc should come first, so if clang is in msvc mode it gets the right defines

 #if defined(__clang__) || defined(__GNUC__)
 # define FOLLY_ALIGNED(size) __attribute__((__aligned__(size)))
 #elif defined(_MSC_VER)
 # define FOLLY_ALIGNED(size) __declspec(align(size))
 #else
 # error Cannot define FOLLY_ALIGNED on this platform
 #endif
 #define FOLLY_ALIGNED_MAX FOLLY_ALIGNED(alignof(std::max_align_t))

 // NOTE: this will only do checking in msvc with versions that support /analyze
 #if _MSC_VER
 # ifdef _USE_ATTRIBUTES_FOR_SAL
 #    undef _USE_ATTRIBUTES_FOR_SAL
 # endif
 /* nolint */
 # define _USE_ATTRIBUTES_FOR_SAL 1
 # include <sal.h>
 # define FOLLY_PRINTF_FORMAT _Printf_format_string_
 # define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) /**/
 #else
 # define FOLLY_PRINTF_FORMAT /**/
 # define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) \
   __attribute__((__format__(__printf__, format_param, dots_param)))
 #endif

 // deprecated
 #if defined(__clang__) || defined(__GNUC__)
 # define FOLLY_DEPRECATED(msg) __attribute__((__deprecated__(msg)))
 #elif defined(_MSC_VER)
 # define FOLLY_DEPRECATED(msg) __declspec(deprecated(msg))
 #else
 # define FOLLY_DEPRECATED(msg)
 #endif

 // noreturn
 #if defined(_MSC_VER)
 # define FOLLY_NORETURN __declspec(noreturn)
 #elif defined(__clang__) || defined(__GNUC__)
 # define FOLLY_NORETURN __attribute__((__noreturn__))
 #else
 # define FOLLY_NORETURN
 #endif

 // noinline
 #ifdef _MSC_VER
 # define FOLLY_NOINLINE __declspec(noinline)
 #elif defined(__clang__) || defined(__GNUC__)
 # define FOLLY_NOINLINE __attribute__((__noinline__))
 #else
 # define FOLLY_NOINLINE
 #endif

 // always inline
 #ifdef _MSC_VER
 # define FOLLY_ALWAYS_INLINE __forceinline
 #elif defined(__clang__) || defined(__GNUC__)
 # define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
 #else
 # define FOLLY_ALWAYS_INLINE
 #endif

 // detection for 64 bit
 #if defined(__x86_64__) || defined(_M_X64)
 # define FOLLY_X64 1
 #else
 # define FOLLY_X64 0
 #endif

 #if defined(__aarch64__)
 # define FOLLY_A64 1
 #else
 # define FOLLY_A64 0
 #endif

 // packing is very ugly in msvc
 #ifdef _MSC_VER
 # define FOLLY_PACK_ATTR /**/
 # define FOLLY_PACK_PUSH __pragma(pack(push, 1))
 # define FOLLY_PACK_POP __pragma(pack(pop))
 #elif defined(__clang__) || defined(__GNUC__)
 # define FOLLY_PACK_ATTR __attribute__((__packed__))
 # define FOLLY_PACK_PUSH /**/
 # define FOLLY_PACK_POP /**/
 #else
 # define FOLLY_PACK_ATTR /**/
 # define FOLLY_PACK_PUSH /**/
 # define FOLLY_PACK_POP /**/
 #endif

 // portable version check
 #ifndef __GNUC_PREREQ
 # if defined __GNUC__ && defined __GNUC_MINOR__
 /* nolint */
 #  define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= \
                                    ((maj) << 16) + (min))
 # else
 /* nolint */
 #  define __GNUC_PREREQ(maj, min) 0
 # endif
 #endif

 #if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
 // gcc 4.8.x incorrectly placed max_align_t in the root namespace
 // Alias it into std (where it's found in 4.9 and later)
 namespace std { typedef ::max_align_t max_align_t; }
 #endif

 /* Define macro wrappers for C++11's "final" and "override" keywords, which
  * are supported in gcc 4.7 but not gcc 4.6. */
 #if !defined(FOLLY_FINAL) && !defined(FOLLY_OVERRIDE)
 # if defined(__clang__) || __GNUC_PREREQ(4, 7)
 #  define FOLLY_FINAL final
 #  define FOLLY_OVERRIDE override
 # elif defined(_MSC_VER) && _MSC_VER >= 1600
 #  define FOLLY_FINAL final
 #  define FOLLY_OVERRIDE override
 # else
 #  define FOLLY_FINAL /**/
 #  define FOLLY_OVERRIDE /**/
 # endif
 #endif

 /* Platform specific TLS support
  * gcc implements __thread
  * msvc implements __declspec(thread)
  * the semantics are the same
  * (but remember __thread has different semantics when using emutls (ex. apple))
  */
 #if defined(_MSC_VER)
 # define FOLLY_TLS __declspec(thread)
 #elif defined(__GNUC__) || defined(__clang__)
 # define FOLLY_TLS __thread
 #else
 # error cannot define platform specific thread local storage
 #endif

 // Define to 1 if you have the `preadv' and `pwritev' functions, respectively
 #if !defined(FOLLY_HAVE_PREADV) && !defined(FOLLY_HAVE_PWRITEV)
 # if defined(__GLIBC_PREREQ)
 #  if __GLIBC_PREREQ(2, 10)
 #   define FOLLY_HAVE_PREADV 1
 #   define FOLLY_HAVE_PWRITEV 1
 #  endif
 # endif
 #endif

 // It turns out that GNU libstdc++ and LLVM libc++ differ on how they implement
 // the 'std' namespace; the latter uses inline namepsaces. Wrap this decision
 // up in a macro to make forward-declarations easier.
 #if FOLLY_USE_LIBCPP
 #include <__config>
 #define FOLLY_NAMESPACE_STD_BEGIN     _LIBCPP_BEGIN_NAMESPACE_STD
 #define FOLLY_NAMESPACE_STD_END       _LIBCPP_END_NAMESPACE_STD
 #else
 #define FOLLY_NAMESPACE_STD_BEGIN     namespace std {
 #define FOLLY_NAMESPACE_STD_END       }
 #endif

 // Some platforms lack clock_gettime(2) and clock_getres(2). Inject our own
 // versions of these into the global namespace.
 #if FOLLY_HAVE_CLOCK_GETTIME
 #include <time.h>
 #else
 #include <folly/detail/Clock.h>
 #endif

 // Provide our own std::__throw_* wrappers for platforms that don't have them
 #if FOLLY_HAVE_BITS_FUNCTEXCEPT_H
 #include <bits/functexcept.h>
 #else
 #include <folly/detail/FunctionalExcept.h>
 #endif

 #if defined(__cplusplus)
 // Unfortunately, boost::has_trivial_copy<T> is broken in libc++ due to its
 // usage of __has_trivial_copy(), so we can't use it as a
 // least-common-denominator for C++11 implementations that don't support
 // std::is_trivially_copyable<T>.
 //
 //      http://stackoverflow.com/questions/12754886/has-trivial-copy-behaves-differently-in-clang-and-gcc-whos-right
 //
 // As a result, use std::is_trivially_copyable() where it exists, and fall back
 // to Boost otherwise.
 #if FOLLY_HAVE_STD__IS_TRIVIALLY_COPYABLE
 #include <type_traits>
 #define FOLLY_IS_TRIVIALLY_COPYABLE(T)                   \
   (std::is_trivially_copyable<T>::value)
 #else
 #include <boost/type_traits.hpp>
 #define FOLLY_IS_TRIVIALLY_COPYABLE(T)                   \
   (boost::has_trivial_copy<T>::value &&                  \
    boost::has_trivial_destructor<T>::value)
 #endif
 #endif // __cplusplus

 // MSVC specific defines
 // mainly for posix compat
 #ifdef _MSC_VER

 // this definition is in a really silly place with a silly name
 // and ifdefing it every time we want it is painful
 #include <basetsd.h>
 typedef SSIZE_T ssize_t;

 // sprintf semantics are not exactly identical
 // but current usage is not a problem
 # define snprintf _snprintf

 // semantics here are identical
 # define strerror_r(errno,buf,len) strerror_s(buf,len,errno)

 // compiler specific to compiler specific
 // nolint
 # define __PRETTY_FUNCTION__ __FUNCSIG__

 // Hide a GCC specific thing that breaks MSVC if left alone.
 # define __extension__

 #ifdef _M_IX86_FP
 # define FOLLY_SSE _M_IX86_FP
 # define FOLLY_SSE_MINOR 0
 #endif

 #endif

 #ifndef FOLLY_SSE
 # if defined(__SSE4_2__)
 #  define FOLLY_SSE 4
 #  define FOLLY_SSE_MINOR 2
 # elif defined(__SSE4_1__)
 #  define FOLLY_SSE 4
 #  define FOLLY_SSE_MINOR 1
 # elif defined(__SSE4__)
 #  define FOLLY_SSE 4
 #  define FOLLY_SSE_MINOR 0
 # elif defined(__SSE3__)
 #  define FOLLY_SSE 3
 #  define FOLLY_SSE_MINOR 0
 # elif defined(__SSE2__)
 #  define FOLLY_SSE 2
 #  define FOLLY_SSE_MINOR 0
 # elif defined(__SSE__)
 #  define FOLLY_SSE 1
 #  define FOLLY_SSE_MINOR 0
 # else
 #  define FOLLY_SSE 0
 #  define FOLLY_SSE_MINOR 0
 # endif
 #endif

 #if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
 namespace FOLLY_GFLAGS_NAMESPACE { }
 namespace gflags {
 using namespace FOLLY_GFLAGS_NAMESPACE;
 }  // namespace gflags
 #endif

 // for TARGET_OS_IPHONE
 #ifdef __APPLE__
 #include <TargetConditionals.h>
 #endif

 // MacOS doesn't have malloc_usable_size()
 #if defined(__APPLE__) && !defined(FOLLY_HAVE_MALLOC_USABLE_SIZE)
 inline size_t malloc_usable_size(void* ptr) {
   return malloc_size(ptr);
 }
 #endif

 // RTTI may not be enabled for this compilation unit.
 #if defined(__GXX_RTTI) || defined(__cpp_rtti) || \
     (defined(_MSC_VER) && defined(_CPPRTTI))
 # define FOLLY_HAS_RTTI 1
 #endif

 #ifdef _MSC_VER
 # include <intrin.h>
 #endif

 namespace folly {

 inline void asm_volatile_memory() {
 #if defined(__clang__) || defined(__GNUC__)
   asm volatile("" : : : "memory");
 #elif defined(_MSC_VER)
   ::_ReadWriteBarrier();
 #endif
 }

 inline void asm_volatile_pause() {
 #if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
   ::_mm_pause();
 #elif defined(__i386__) || FOLLY_X64
   asm volatile ("pause");
 #elif FOLLY_A64
   asm volatile ("wfe");
 #endif
 }
 inline void asm_pause() {
 #if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
   ::_mm_pause();
 #elif defined(__i386__) || FOLLY_X64
   asm ("pause");
 #elif FOLLY_A64
   asm ("wfe");
 #endif
 }

 }

 #endif // FOLLY_PORTABILITY_H_
	/*
	* Copyright 2015 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef FOLLY_PORTABILITY_H_
	#define FOLLY_PORTABILITY_H_

	#include <cstddef>

	#ifndef FOLLY_NO_CONFIG
	#include <folly/folly-config.h>
	#endif

	#ifdef FOLLY_PLATFORM_CONFIG
	#include FOLLY_PLATFORM_CONFIG
	#endif

	#if FOLLY_HAVE_FEATURES_H
	#include <features.h>
	#endif

	#include <folly/CPortability.h>

	#ifdef __APPLE__
	# include <malloc/malloc.h>
	#endif

	#if FOLLY_HAVE_SCHED_H
	#include <sched.h>
	#ifndef FOLLY_HAVE_PTHREAD_YIELD
	#define pthread_yield sched_yield
	#endif
	#endif

	// A change in folly/MemoryMapping.cpp uses MAP_ANONYMOUS, which is named
	// MAP_ANON on OSX/BSD.
	#if defined(__APPLE__) \|\| defined(__FreeBSD__)
	#include <sys/mman.h>
	#ifndef MAP_ANONYMOUS
	#ifdef MAP_ANON
	#define MAP_ANONYMOUS MAP_ANON
	#endif
	#endif
	#endif

	// compiler specific attribute translation
	// msvc should come first, so if clang is in msvc mode it gets the right defines

	#if defined(__clang__) \|\| defined(__GNUC__)
	# define FOLLY_ALIGNED(size) __attribute__((__aligned__(size)))
	#elif defined(_MSC_VER)
	# define FOLLY_ALIGNED(size) __declspec(align(size))
	#else
	# error Cannot define FOLLY_ALIGNED on this platform
	#endif
	#define FOLLY_ALIGNED_MAX FOLLY_ALIGNED(alignof(std::max_align_t))

	// NOTE: this will only do checking in msvc with versions that support /analyze
	#if _MSC_VER
	# ifdef _USE_ATTRIBUTES_FOR_SAL
	# undef _USE_ATTRIBUTES_FOR_SAL
	# endif
	/* nolint */
	# define _USE_ATTRIBUTES_FOR_SAL 1
	# include <sal.h>
	# define FOLLY_PRINTF_FORMAT _Printf_format_string_
	# define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) /**/
	#else
	# define FOLLY_PRINTF_FORMAT /**/
	# define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) \
	__attribute__((__format__(__printf__, format_param, dots_param)))
	#endif

	// deprecated
	#if defined(__clang__) \|\| defined(__GNUC__)
	# define FOLLY_DEPRECATED(msg) __attribute__((__deprecated__(msg)))
	#elif defined(_MSC_VER)
	# define FOLLY_DEPRECATED(msg) __declspec(deprecated(msg))
	#else
	# define FOLLY_DEPRECATED(msg)
	#endif

	// noreturn
	#if defined(_MSC_VER)
	# define FOLLY_NORETURN __declspec(noreturn)
	#elif defined(__clang__) \|\| defined(__GNUC__)
	# define FOLLY_NORETURN __attribute__((__noreturn__))
	#else
	# define FOLLY_NORETURN
	#endif

	// noinline
	#ifdef _MSC_VER
	# define FOLLY_NOINLINE __declspec(noinline)
	#elif defined(__clang__) \|\| defined(__GNUC__)
	# define FOLLY_NOINLINE __attribute__((__noinline__))
	#else
	# define FOLLY_NOINLINE
	#endif

	// always inline
	#ifdef _MSC_VER
	# define FOLLY_ALWAYS_INLINE __forceinline
	#elif defined(__clang__) \|\| defined(__GNUC__)
	# define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
	#else
	# define FOLLY_ALWAYS_INLINE
	#endif

	// detection for 64 bit
	#if defined(__x86_64__) \|\| defined(_M_X64)
	# define FOLLY_X64 1
	#else
	# define FOLLY_X64 0
	#endif

	#if defined(__aarch64__)
	# define FOLLY_A64 1
	#else
	# define FOLLY_A64 0
	#endif

	// packing is very ugly in msvc
	#ifdef _MSC_VER
	# define FOLLY_PACK_ATTR /**/
	# define FOLLY_PACK_PUSH __pragma(pack(push, 1))
	# define FOLLY_PACK_POP __pragma(pack(pop))
	#elif defined(__clang__) \|\| defined(__GNUC__)
	# define FOLLY_PACK_ATTR __attribute__((__packed__))
	# define FOLLY_PACK_PUSH /**/
	# define FOLLY_PACK_POP /**/
	#else
	# define FOLLY_PACK_ATTR /**/
	# define FOLLY_PACK_PUSH /**/
	# define FOLLY_PACK_POP /**/
	#endif

	// portable version check
	#ifndef __GNUC_PREREQ
	# if defined __GNUC__ && defined __GNUC_MINOR__
	/* nolint */
	# define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= \
	((maj) << 16) + (min))
	# else
	/* nolint */
	# define __GNUC_PREREQ(maj, min) 0
	# endif
	#endif

	#if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
	// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
	// gcc 4.8.x incorrectly placed max_align_t in the root namespace
	// Alias it into std (where it's found in 4.9 and later)
	namespace std { typedef ::max_align_t max_align_t; }
	#endif

	/* Define macro wrappers for C++11's "final" and "override" keywords, which
	* are supported in gcc 4.7 but not gcc 4.6. */
	#if !defined(FOLLY_FINAL) && !defined(FOLLY_OVERRIDE)
	# if defined(__clang__) \|\| __GNUC_PREREQ(4, 7)
	# define FOLLY_FINAL final
	# define FOLLY_OVERRIDE override
	# elif defined(_MSC_VER) && _MSC_VER >= 1600
	# define FOLLY_FINAL final
	# define FOLLY_OVERRIDE override
	# else
	# define FOLLY_FINAL /**/
	# define FOLLY_OVERRIDE /**/
	# endif
	#endif

	/* Platform specific TLS support
	* gcc implements __thread
	* msvc implements __declspec(thread)
	* the semantics are the same
	* (but remember __thread has different semantics when using emutls (ex. apple))
	*/
	#if defined(_MSC_VER)
	# define FOLLY_TLS __declspec(thread)
	#elif defined(__GNUC__) \|\| defined(__clang__)
	# define FOLLY_TLS __thread
	#else
	# error cannot define platform specific thread local storage
	#endif

	// Define to 1 if you have the `preadv' and `pwritev' functions, respectively
	#if !defined(FOLLY_HAVE_PREADV) && !defined(FOLLY_HAVE_PWRITEV)
	# if defined(__GLIBC_PREREQ)
	# if __GLIBC_PREREQ(2, 10)
	# define FOLLY_HAVE_PREADV 1
	# define FOLLY_HAVE_PWRITEV 1
	# endif
	# endif
	#endif

	// It turns out that GNU libstdc++ and LLVM libc++ differ on how they implement
	// the 'std' namespace; the latter uses inline namepsaces. Wrap this decision
	// up in a macro to make forward-declarations easier.
	#if FOLLY_USE_LIBCPP
	#include <__config>
	#define FOLLY_NAMESPACE_STD_BEGIN _LIBCPP_BEGIN_NAMESPACE_STD
	#define FOLLY_NAMESPACE_STD_END _LIBCPP_END_NAMESPACE_STD
	#else
	#define FOLLY_NAMESPACE_STD_BEGIN namespace std {
	#define FOLLY_NAMESPACE_STD_END }
	#endif

	// Some platforms lack clock_gettime(2) and clock_getres(2). Inject our own
	// versions of these into the global namespace.
	#if FOLLY_HAVE_CLOCK_GETTIME
	#include <time.h>
	#else
	#include <folly/detail/Clock.h>
	#endif

	// Provide our own std::__throw_* wrappers for platforms that don't have them
	#if FOLLY_HAVE_BITS_FUNCTEXCEPT_H
	#include <bits/functexcept.h>
	#else
	#include <folly/detail/FunctionalExcept.h>
	#endif

	#if defined(__cplusplus)
	// Unfortunately, boost::has_trivial_copy<T> is broken in libc++ due to its
	// usage of __has_trivial_copy(), so we can't use it as a
	// least-common-denominator for C++11 implementations that don't support
	// std::is_trivially_copyable<T>.
	//
	// http://stackoverflow.com/questions/12754886/has-trivial-copy-behaves-differently-in-clang-and-gcc-whos-right
	//
	// As a result, use std::is_trivially_copyable() where it exists, and fall back
	// to Boost otherwise.
	#if FOLLY_HAVE_STD__IS_TRIVIALLY_COPYABLE
	#include <type_traits>
	#define FOLLY_IS_TRIVIALLY_COPYABLE(T) \
	(std::is_trivially_copyable<T>::value)
	#else
	#include <boost/type_traits.hpp>
	#define FOLLY_IS_TRIVIALLY_COPYABLE(T) \
	(boost::has_trivial_copy<T>::value && \
	boost::has_trivial_destructor<T>::value)
	#endif
	#endif // __cplusplus

	// MSVC specific defines
	// mainly for posix compat
	#ifdef _MSC_VER

	// this definition is in a really silly place with a silly name
	// and ifdefing it every time we want it is painful
	#include <basetsd.h>
	typedef SSIZE_T ssize_t;

	// sprintf semantics are not exactly identical
	// but current usage is not a problem
	# define snprintf _snprintf

	// semantics here are identical
	# define strerror_r(errno,buf,len) strerror_s(buf,len,errno)

	// compiler specific to compiler specific
	// nolint
	# define __PRETTY_FUNCTION__ __FUNCSIG__

	// Hide a GCC specific thing that breaks MSVC if left alone.
	# define __extension__

	#ifdef _M_IX86_FP
	# define FOLLY_SSE _M_IX86_FP
	# define FOLLY_SSE_MINOR 0
	#endif

	#endif

	#ifndef FOLLY_SSE
	# if defined(__SSE4_2__)
	# define FOLLY_SSE 4
	# define FOLLY_SSE_MINOR 2
	# elif defined(__SSE4_1__)
	# define FOLLY_SSE 4
	# define FOLLY_SSE_MINOR 1
	# elif defined(__SSE4__)
	# define FOLLY_SSE 4
	# define FOLLY_SSE_MINOR 0
	# elif defined(__SSE3__)
	# define FOLLY_SSE 3
	# define FOLLY_SSE_MINOR 0
	# elif defined(__SSE2__)
	# define FOLLY_SSE 2
	# define FOLLY_SSE_MINOR 0
	# elif defined(__SSE__)
	# define FOLLY_SSE 1
	# define FOLLY_SSE_MINOR 0
	# else
	# define FOLLY_SSE 0
	# define FOLLY_SSE_MINOR 0
	# endif
	#endif

	#if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
	namespace FOLLY_GFLAGS_NAMESPACE { }
	namespace gflags {
	using namespace FOLLY_GFLAGS_NAMESPACE;
	} // namespace gflags
	#endif

	// for TARGET_OS_IPHONE
	#ifdef __APPLE__
	#include <TargetConditionals.h>
	#endif

	// MacOS doesn't have malloc_usable_size()
	#if defined(__APPLE__) && !defined(FOLLY_HAVE_MALLOC_USABLE_SIZE)
	inline size_t malloc_usable_size(void* ptr) {
	return malloc_size(ptr);
	}
	#endif

	// RTTI may not be enabled for this compilation unit.
	#if defined(__GXX_RTTI) \|\| defined(__cpp_rtti) \|\| \
	(defined(_MSC_VER) && defined(_CPPRTTI))
	# define FOLLY_HAS_RTTI 1
	#endif

	#ifdef _MSC_VER
	# include <intrin.h>
	#endif

	namespace folly {

	inline void asm_volatile_memory() {
	#if defined(__clang__) \|\| defined(__GNUC__)
	asm volatile("" : : : "memory");
	#elif defined(_MSC_VER)
	::_ReadWriteBarrier();
	#endif
	}

	inline void asm_volatile_pause() {
	#if defined(_MSC_VER) && (defined(_M_IX86) \|\| defined(_M_X64))
	::_mm_pause();
	#elif defined(__i386__) \|\| FOLLY_X64
	asm volatile ("pause");
	#elif FOLLY_A64
	asm volatile ("wfe");
	#endif
	}
	inline void asm_pause() {
	#if defined(_MSC_VER) && (defined(_M_IX86) \|\| defined(_M_X64))
	::_mm_pause();
	#elif defined(__i386__) \|\| FOLLY_X64
	asm ("pause");
	#elif FOLLY_A64
	asm ("wfe");
	#endif
	}

	}

	#endif // FOLLY_PORTABILITY_H_