/*
- * Copyright 2012 Facebook, Inc.
+ * Copyright 2016 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* limitations under the License.
*/
-#ifndef FOLLY_PORTABILITY_H_
-#define FOLLY_PORTABILITY_H_
+#pragma once
-#include "folly-config.h"
+#include <string.h>
-#ifdef FOLLY_HAVE_SCHED_H
+#include <cstddef>
+
+#include <folly/portability/Config.h>
+
+#include <folly/CPortability.h>
+
+#if FOLLY_HAVE_SCHED_H
#include <sched.h>
- #ifndef FOLLY_HAVE_PTHREAD_YIELD
- #define pthread_yield sched_yield
- #endif
#endif
+// Unaligned loads and stores
+namespace folly {
+#if FOLLY_HAVE_UNALIGNED_ACCESS
+constexpr bool kHasUnalignedAccess = true;
+#else
+constexpr bool kHasUnalignedAccess = false;
+#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
+
+// 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 inline
+#endif
+
+// target
+#ifdef _MSC_VER
+# define FOLLY_TARGET_ATTRIBUTE(target)
+#else
+# define FOLLY_TARGET_ATTRIBUTE(target) __attribute__((__target__(target)))
+#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
+
+#if defined (__powerpc64__)
+# define FOLLY_PPC64 1
+#else
+# define FOLLY_PPC64 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
+
+// Generalize warning push/pop.
+#if defined(_MSC_VER)
+# define FOLLY_PUSH_WARNING __pragma(warning(push))
+# define FOLLY_POP_WARNING __pragma(warning(pop))
+// Disable the GCC warnings.
+# define FOLLY_GCC_DISABLE_WARNING(warningName)
+# define FOLLY_MSVC_DISABLE_WARNING(warningNumber) __pragma(warning(disable: warningNumber))
+#elif defined(__clang__) || defined(__GNUC__)
+# define FOLLY_PUSH_WARNING _Pragma("GCC diagnostic push")
+# define FOLLY_POP_WARNING _Pragma("GCC diagnostic pop")
+#define FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName) #warningName
+#define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) \
+ FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName)
+#define FOLLY_GCC_DISABLE_WARNING(warningName) \
+ _Pragma(FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored \
+ FOLLY_GCC_DISABLE_WARNING_INTERNAL3(-W##warningName)))
+// Disable the MSVC warnings.
+# define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
+#else
+# define FOLLY_PUSH_WARNING
+# define FOLLY_POP_WARNING
+# define FOLLY_GCC_DISABLE_WARNING(warningName)
+# define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
+#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
+
+// portable version check for clang
+#ifndef __CLANG_PREREQ
+# if defined __clang__ && defined __clang_major__ && defined __clang_minor__
+/* nolint */
+# define __CLANG_PREREQ(maj, min) \
+ ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
+# else
+/* nolint */
+# define __CLANG_PREREQ(maj, min) 0
+# 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
-#endif // FOLLY_PORTABILITY_H_
+#if FOLLY_MOBILE
+#undef FOLLY_TLS
+#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 namespaces. 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
+
+// If the new c++ ABI is used, __cxx11 inline namespace needs to be added to
+// some types, e.g. std::list.
+#if _GLIBCXX_USE_CXX11_ABI
+# define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN _GLIBCXX_BEGIN_NAMESPACE_CXX11
+# define FOLLY_GLIBCXX_NAMESPACE_CXX11_END _GLIBCXX_END_NAMESPACE_CXX11
+#else
+# define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN
+# define FOLLY_GLIBCXX_NAMESPACE_CXX11_END
+#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
+#include <folly/portability/SysTypes.h>
+
+// 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__
+
+// We have compiler support for the newest of the new, but
+// MSVC doesn't tell us that.
+#define __SSE4_2__ 1
+
+#endif
+
+// Debug
+namespace folly {
+#ifdef NDEBUG
+constexpr auto kIsDebug = false;
+#else
+constexpr auto kIsDebug = true;
+#endif
+}
+
+// Endianness
+namespace folly {
+#ifdef _MSC_VER
+// It's MSVC, so we just have to guess ... and allow an override
+#ifdef FOLLY_ENDIAN_BE
+constexpr auto kIsLittleEndian = false;
+#else
+constexpr auto kIsLittleEndian = true;
+#endif
+#else
+constexpr auto kIsLittleEndian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__;
+#endif
+constexpr auto kIsBigEndian = !kIsLittleEndian;
+}
+
+#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
+
+#define FOLLY_SSE_PREREQ(major, minor) \
+ (FOLLY_SSE > major || FOLLY_SSE == major && FOLLY_SSE_MINOR >= minor)
+
+#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
+
+// 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
+
+#if defined(__APPLE__) || defined(_MSC_VER)
+#define FOLLY_STATIC_CTOR_PRIORITY_MAX
+#else
+// 101 is the highest priority allowed by the init_priority attribute.
+// This priority is already used by JEMalloc and other memory allocators so
+// we will take the next one.
+#define FOLLY_STATIC_CTOR_PRIORITY_MAX __attribute__((__init_priority__(102)))
+#endif
projects / folly.git / blobdiff