X-Git-Url: http://plrg.eecs.uci.edu/git/?p=folly.git;a=blobdiff_plain;f=folly%2FPortability.h;h=6c140379de9e9920755e3eb70cb615c6bd8acb88;hp=d0c14dd7e388122d732b9f29fb1ae11c0aebde1c;hb=614eb71734a284e1a9fefabcc48743a3c8efd653;hpb=2177f05a16891e5dc381ccfa56d36ce91418aa09

diff --git a/folly/Portability.h b/folly/Portability.h
index d0c14dd7..6c140379 100644
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -33,21 +33,20 @@ constexpr bool kHasUnalignedAccess = true;
 constexpr bool kHasUnalignedAccess = false;
 #endif
 
-namespace detail {
+namespace portability_detail {
+
+template <typename I, I A, I B>
+using integral_max = std::integral_constant<I, (A < B) ? B : A>;
 
 template <typename I, I A, I... Bs>
-struct integral_max
-    : std::integral_constant<
-          I,
-          (A > integral_max<I, Bs...>::value) ? A
-                                              : integral_max<I, Bs...>::value> {
-};
+struct integral_sequence_max
+    : integral_max<I, A, integral_sequence_max<I, Bs...>::value> {};
 
-template <typename I, size_t A>
-struct integral_max<I, A> : std::integral_constant<I, A> {};
+template <typename I, I A>
+struct integral_sequence_max<I, A> : std::integral_constant<I, A> {};
 
 template <typename... Ts>
-using max_alignment = integral_max<size_t, alignof(Ts)...>;
+using max_alignment = integral_sequence_max<size_t, alignof(Ts)...>;
 
 using max_basic_alignment = max_alignment<
     std::max_align_t,
@@ -64,9 +63,9 @@ using max_basic_alignment = max_alignment<
     char32_t,
     wchar_t,
     std::nullptr_t>;
-} // namespace detail
+} // namespace portability_detail
 
-constexpr size_t max_align_v = detail::max_basic_alignment::value;
+constexpr size_t max_align_v = portability_detail::max_basic_alignment::value;
 
 // max_align_t is a type which is aligned at least as strictly as the
 // most-aligned basic type (see the specification of std::max_align_t). This
@@ -170,9 +169,9 @@ struct alignas(max_align_v) max_align_t {};
 #endif
 
 #if defined(__aarch64__)
-# define FOLLY_A64 1
+# define FOLLY_AARCH64 1
 #else
-# define FOLLY_A64 0
+# define FOLLY_AARCH64 0
 #endif
 
 #if defined (__powerpc64__)
@@ -183,9 +182,9 @@ struct alignas(max_align_v) max_align_t {};
 
 namespace folly {
 constexpr bool kIsArchAmd64 = FOLLY_X64 == 1;
-constexpr bool kIsArchAArch64 = FOLLY_A64 == 1;
+constexpr bool kIsArchAArch64 = FOLLY_AARCH64 == 1;
 constexpr bool kIsArchPPC64 = FOLLY_PPC64 == 1;
-}
+} // namespace folly
 
 namespace folly {
 
@@ -200,7 +199,13 @@ constexpr bool kIsSanitizeThread = true;
 #else
 constexpr bool kIsSanitizeThread = false;
 #endif
-}
+
+#if FOLLY_SANITIZE
+constexpr bool kIsSanitize = true;
+#else
+constexpr bool kIsSanitize = false;
+#endif
+} // namespace folly
 
 // packing is very ugly in msvc
 #ifdef _MSC_VER
@@ -240,7 +245,7 @@ constexpr bool kIsSanitizeThread = false;
 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
 #endif
 
-#ifdef HAVE_SHADOW_LOCAL_WARNINGS
+#ifdef FOLLY_HAVE_SHADOW_LOCAL_WARNINGS
 #define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS        \
   FOLLY_GCC_DISABLE_WARNING("-Wshadow-compatible-local") \
   FOLLY_GCC_DISABLE_WARNING("-Wshadow-local")
@@ -248,18 +253,6 @@ constexpr bool kIsSanitizeThread = false;
 #define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS /* empty */
 #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)
@@ -326,7 +319,7 @@ constexpr auto kIsDebug = false;
 #else
 constexpr auto kIsDebug = true;
 #endif
-}
+} // namespace folly
 
 // Endianness
 namespace folly {
@@ -341,7 +334,7 @@ constexpr auto kIsLittleEndian = true;
 constexpr auto kIsLittleEndian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__;
 #endif
 constexpr auto kIsBigEndian = !kIsLittleEndian;
-}
+} // namespace folly
 
 #ifndef FOLLY_SSE
 # if defined(__SSE4_2__)
@@ -375,7 +368,7 @@ constexpr auto kIsBigEndian = !kIsLittleEndian;
 namespace FOLLY_GFLAGS_NAMESPACE { }
 namespace gflags {
 using namespace FOLLY_GFLAGS_NAMESPACE;
-}  // namespace gflags
+} // namespace gflags
 #endif
 
 // for TARGET_OS_IPHONE
@@ -419,4 +412,31 @@ constexpr auto kMscVer = _MSC_VER;
 constexpr auto kIsWindows = false;
 constexpr auto kMscVer = 0;
 #endif
-}
+} // namespace folly
+
+// Define FOLLY_USE_CPP14_CONSTEXPR to be true if the compiler's C++14
+// constexpr support is "good enough".
+#ifndef FOLLY_USE_CPP14_CONSTEXPR
+#if defined(__clang__)
+#define FOLLY_USE_CPP14_CONSTEXPR __cplusplus >= 201300L
+#elif defined(__GNUC__)
+#define FOLLY_USE_CPP14_CONSTEXPR __cplusplus >= 201304L
+#else
+#define FOLLY_USE_CPP14_CONSTEXPR 0 // MSVC?
+#endif
+#endif
+
+#if FOLLY_USE_CPP14_CONSTEXPR
+#define FOLLY_CPP14_CONSTEXPR constexpr
+#else
+#define FOLLY_CPP14_CONSTEXPR inline
+#endif
+
+#if __cpp_coroutines >= 201703L || (_MSC_VER && _RESUMABLE_FUNCTIONS_SUPPORTED)
+#define FOLLY_HAS_COROUTINES 1
+#endif
+
+// MSVC 2017.5
+#if __cpp_noexcept_function_type >= 201510 || _MSC_FULL_VER >= 191225816
+#define FOLLY_HAVE_NOEXCEPT_FUNCTION_TYPE 1
+#endif