/*
- * Copyright 2012 Facebook, Inc.
+ * 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.
#ifndef FOLLY_PORTABILITY_H_
#define FOLLY_PORTABILITY_H_
-#include "folly-config.h"
+#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
-#ifdef FOLLY_HAVE_SCHED_H
+#if FOLLY_HAVE_SCHED_H
#include <sched.h>
#ifndef FOLLY_HAVE_PTHREAD_YIELD
#define pthread_yield sched_yield
#endif
#endif
-// Define macro wrappers for C++11's "final" and "override" keywords, which
-// are supported in gcc 4.7 but not gcc 4.6.
-//
-// TODO(tudorb/agallagher): Autotoolize this.
-#undef FOLLY_FINAL
-#undef FOLLY_OVERRIDE
+// 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
+// MaxAlign: max_align_t isn't supported by gcc
#ifdef __GNUC__
-# if __GNUC_PREREQ(4,7)
+struct MaxAlign { char c; } __attribute__((__aligned__));
+#else /* !__GNUC__ */
+# error Cannot define MaxAlign on this platform
+#endif
+
+// compiler specific attribute translation
+// msvc should come first, so if clang is in msvc mode it gets the right defines
+
+// 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)))
+#else
+# define FOLLY_DEPRECATED
+#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
+
+
+/* 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
+# 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
-#ifndef FOLLY_FINAL
-# define FOLLY_FINAL
+// 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__
+#endif
+
+#if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
+namespace FOLLY_GFLAGS_NAMESPACE { }
+namespace gflags {
+using namespace FOLLY_GFLAGS_NAMESPACE;
+} // namespace gflags
#endif
-#ifndef FOLLY_OVERRIDE
-# define FOLLY_OVERRIDE
+// 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)
+# define FOLLY_HAS_RTTI 1
+#endif
+
+namespace folly {
+
+inline void asm_volatile_pause() {
+#if defined(__i386__) || FOLLY_X64
+ asm volatile ("pause");
+#elif FOLLY_A64
+ asm volatile ("wfe");
+#endif
+}
+inline void asm_pause() {
+#if defined(__i386__) || FOLLY_X64
+ asm ("pause");
+#elif FOLLY_A64
+ asm ("wfe");
#endif
+}
+}
#endif // FOLLY_PORTABILITY_H_
projects / folly.git / blobdiff