Rename fixup from TDelayedDestruction to DelayedDestruction.

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index dd2df1be4110133109e882208995b2d7bb05e02b..77baf95ab6cd58583ea013b99944edcde6a008be 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -17,6 +17,8 @@
 #ifndef FOLLY_PORTABILITY_H_
 #define FOLLY_PORTABILITY_H_
 
+#include <cstddef>
+
 #ifndef FOLLY_NO_CONFIG
 #include <folly/folly-config.h>
 #endif
@@ -53,16 +55,18 @@
   #endif
 #endif
 
-// MaxAlign: max_align_t isn't supported by gcc
-#ifdef __GNUC__
-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
 
+#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
@@ -79,6 +83,15 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
   __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)
@@ -113,6 +126,12 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 # 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 /**/
@@ -140,6 +159,12 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 # 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. */
@@ -147,6 +172,9 @@ struct MaxAlign { char c; } __attribute__((__aligned__));
 # 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 /**/
@@ -245,6 +273,40 @@ typedef SSIZE_T ssize_t;
 // 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
@@ -266,4 +328,45 @@ inline size_t malloc_usable_size(void* 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_