X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2FPortability.h;h=17c064ba8a6f01d1d9771942a2c99a091cbf5241;hb=cc0ca971057edb5e4c8f78946b0c5508395ecc48;hp=3df79c9a3755f427486cf4323d84749219837a58;hpb=d9e0b59db5fce150845190686bf681b715e418ae;p=folly.git

diff --git a/folly/Portability.h b/folly/Portability.h
index 3df79c9a..17c064ba 100644
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef FOLLY_PORTABILITY_H_
-#define FOLLY_PORTABILITY_H_
+#pragma once
 
 #include <string.h>
 
@@ -23,21 +22,10 @@
 
 #include <folly/portability/Config.h>
 
-#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
 
 // Unaligned loads and stores
@@ -49,17 +37,6 @@ constexpr bool kHasUnalignedAccess = false;
 #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
 
@@ -97,31 +74,20 @@ constexpr bool kHasUnalignedAccess = false;
 # 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)
+// warn unused result
+#if defined(_MSC_VER) && (_MSC_VER >= 1700)
+#define FOLLY_WARN_UNUSED_RESULT _Check_return_
 #elif defined(__clang__) || defined(__GNUC__)
-# define FOLLY_NOINLINE __attribute__((__noinline__))
+#define FOLLY_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
 #else
-# define FOLLY_NOINLINE
+#define FOLLY_WARN_UNUSED_RESULT
 #endif
 
-// always inline
+// target
 #ifdef _MSC_VER
-# define FOLLY_ALWAYS_INLINE __forceinline
-#elif defined(__clang__) || defined(__GNUC__)
-# define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
+# define FOLLY_TARGET_ATTRIBUTE(target)
 #else
-# define FOLLY_ALWAYS_INLINE inline
+# define FOLLY_TARGET_ATTRIBUTE(target) __attribute__((__target__(target)))
 #endif
 
 // detection for 64 bit
@@ -143,6 +109,12 @@ constexpr bool kHasUnalignedAccess = false;
 # define FOLLY_PPC64 0
 #endif
 
+namespace folly {
+constexpr bool kIsArchAmd64 = FOLLY_X64 == 1;
+constexpr bool kIsArchAArch64 = FOLLY_A64 == 1;
+constexpr bool kIsArchPPC64 = FOLLY_PPC64 == 1;
+}
+
 // packing is very ugly in msvc
 #ifdef _MSC_VER
 # define FOLLY_PACK_ATTR /**/
@@ -183,16 +155,12 @@ constexpr bool kHasUnalignedAccess = false;
 # 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
+#ifdef HAVE_SHADOW_LOCAL_WARNINGS
+#define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS        \
+  FOLLY_GCC_DISABLE_WARNING(shadow-compatible-local) \
+  FOLLY_GCC_DISABLE_WARNING(shadow-local)
+#else
+#define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS /* empty */
 #endif
 
 #if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
@@ -228,20 +196,10 @@ namespace std { typedef ::max_align_t max_align_t; }
 # error cannot define platform specific thread local storage
 #endif
 
-#if defined(__APPLE__) && (TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE)
+#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.
@@ -257,62 +215,19 @@ namespace std { typedef ::max_align_t max_align_t; }
 // 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_BEGIN \
+  inline _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
 
-// 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
 #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__
@@ -320,10 +235,9 @@ namespace std { typedef ::max_align_t max_align_t; }
 // 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
+// We have compiler support for the newest of the new, but
+// MSVC doesn't tell us that.
+#define __SSE4_2__ 1
 
 #endif
 
@@ -391,64 +305,32 @@ using namespace FOLLY_GFLAGS_NAMESPACE;
 #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>
+#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
 
 namespace folly {
 
-inline void asm_volatile_memory() {
-#if defined(__clang__) || defined(__GNUC__)
-  asm volatile("" : : : "memory");
-#elif defined(_MSC_VER)
-  ::_ReadWriteBarrier();
+#if defined(__linux__) && !FOLLY_MOBILE
+constexpr auto kIsLinux = true;
+#else
+constexpr auto kIsLinux = false;
 #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 || defined(__arm__)
-  asm volatile ("yield");
-#elif FOLLY_PPC64
-  asm volatile("or 27,27,27");
-#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 || defined(__arm__)
-  asm ("yield");
-#elif FOLLY_PPC64
-  asm ("or 31,31,31");
-#endif
-}
-
-#if defined(__APPLE__) || defined(_MSC_VER)
-#define MAX_STATIC_CONSTRUCTOR_PRIORITY
+#if defined(_WIN32)
+constexpr auto kIsWindows = true;
 #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 MAX_STATIC_CONSTRUCTOR_PRIORITY __attribute__ ((__init_priority__(102)))
+constexpr auto kIsWindows = false;
 #endif
-
-} // namespace folly
-#endif // FOLLY_PORTABILITY_H_
+}