Allow override for unaligned reads in SpookyHashV2

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index 5e2eff3d6b31b508578e693ba3b9a2116d9041fb..63318a2ce3a2ae14783dc5f265071760b1756bd5 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -17,6 +17,10 @@
 #ifndef FOLLY_PORTABILITY_H_
 #define FOLLY_PORTABILITY_H_
 
+// @nocommit invalidate ccache 20151125 (see #8764509)
+
+#include <string.h>
+
 #include <cstddef>
 
 #ifndef FOLLY_NO_CONFIG
@@ -44,6 +48,10 @@
  #endif
 #endif
 
+#ifndef FOLLY_HAVE_UNALIGNED_READS
+#define FOLLY_HAVE_UNALIGNED_READS 0
+#endif
+
 // A change in folly/MemoryMapping.cpp uses MAP_ANONYMOUS, which is named
 // MAP_ANON on OSX/BSD.
 #if defined(__APPLE__) || defined(__FreeBSD__)
@@ -116,7 +124,7 @@
 #elif defined(__clang__) || defined(__GNUC__)
 # define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
 #else
-# define FOLLY_ALWAYS_INLINE
+# define FOLLY_ALWAYS_INLINE inline
 #endif
 
 // detection for 64 bit
@@ -132,6 +140,12 @@
 # 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 /**/
@@ -159,25 +173,22 @@
 # endif
 #endif
 
-#if defined(__GNUC__) && !__GNUC_PREREQ(4,9)
+#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. */
-#if !defined(FOLLY_FINAL) && !defined(FOLLY_OVERRIDE)
-# 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
+// 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
-#  define FOLLY_FINAL /**/
-#  define FOLLY_OVERRIDE /**/
+/* nolint */
+#  define __CLANG_PREREQ(maj, min) 0
 # endif
 #endif
 
@@ -217,6 +228,16 @@ namespace std { typedef ::max_align_t max_align_t; }
 #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
+
 // 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
@@ -309,6 +330,9 @@ typedef SSIZE_T ssize_t;
 # 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 {
@@ -355,6 +379,8 @@ inline void asm_volatile_pause() {
   asm volatile ("pause");
 #elif FOLLY_A64
   asm volatile ("wfe");
+#elif FOLLY_PPC64
+  asm volatile("or 27,27,27");
 #endif
 }
 inline void asm_pause() {
@@ -364,9 +390,27 @@ inline void asm_pause() {
   asm ("pause");
 #elif FOLLY_A64
   asm ("wfe");
+#elif FOLLY_PPC64
+  asm ("or 31,31,31");
 #endif
 }
 
+constexpr size_t constexpr_strlen(const char* s) {
+#if defined(__clang__)
+  return __builtin_strlen(s);
+#else
+  return strlen(s);
+#endif
 }
 
+#if defined(__APPLE__) || defined(_MSC_VER)
+#define MAX_STATIC_CONSTRUCTOR_PRIORITY
+#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)))
+#endif
+
+} // namespace folly
 #endif // FOLLY_PORTABILITY_H_