folly copyright 2015 -> copyright 2016

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index 594ab9aa6a73a267cf14e4832b9e456ba951245a..b35bdee89950cf8eb62de55a81f24e56998206be 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Facebook, Inc.
+ * Copyright 2016 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,8 @@
 #ifndef FOLLY_PORTABILITY_H_
 #define FOLLY_PORTABILITY_H_
 
+// @nocommit invalidate ccache 20151125 (see #8764509)
+
 #include <string.h>
 
 #include <cstddef>
@@ -46,6 +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__)
@@ -155,6 +161,31 @@
 # define FOLLY_PACK_POP /**/
 #endif
 
+// Generalize warning push/pop.
+#if defined(_MSC_VER)
+# define FOLLY_PUSH_WARNING __pragma(warning(push))
+# define FOLLY_POP_WARNING __pragma(warning(pop))
+// Disable the GCC warnings.
+# define FOLLY_GCC_DISABLE_WARNING(warningName)
+# define FOLLY_MSVC_DISABLE_WARNING(warningNumber) __pragma(warning(disable: warningNumber))
+#elif defined(__clang__) || defined(__GNUC__)
+# define FOLLY_PUSH_WARNING _Pragma("GCC diagnostic push")
+# define FOLLY_POP_WARNING _Pragma("GCC diagnostic pop")
+#define FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName) #warningName
+#define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) \
+  FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName)
+#define FOLLY_GCC_DISABLE_WARNING(warningName)                       \
+  _Pragma(FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored \
+          FOLLY_GCC_DISABLE_WARNING_INTERNAL3(-W##warningName)))
+// Disable the MSVC warnings.
+# define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
+#else
+# define FOLLY_PUSH_WARNING
+# define FOLLY_POP_WARNING
+# define FOLLY_GCC_DISABLE_WARNING(warningName)
+# define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
+#endif
+
 // portable version check
 #ifndef __GNUC_PREREQ
 # if defined __GNUC__ && defined __GNUC_MINOR__
@@ -174,6 +205,18 @@
 namespace std { typedef ::max_align_t max_align_t; }
 #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)
@@ -188,6 +231,10 @@ 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)
+#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)
@@ -199,7 +246,7 @@ namespace std { typedef ::max_align_t max_align_t; }
 #endif
 
 // 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
+// the 'std' namespace; the latter uses inline namespaces. Wrap this decision
 // up in a macro to make forward-declarations easier.
 #if FOLLY_USE_LIBCPP
 #include <__config>
@@ -287,6 +334,30 @@ typedef SSIZE_T ssize_t;
 
 #endif
 
+// Debug
+namespace folly {
+#ifdef NDEBUG
+constexpr auto kIsDebug = false;
+#else
+constexpr auto kIsDebug = true;
+#endif
+}
+
+// Endianness
+namespace folly {
+#ifdef _MSC_VER
+// It's MSVC, so we just have to guess ... and allow an override
+#ifdef FOLLY_ENDIAN_BE
+constexpr auto kIsLittleEndian = false;
+#else
+constexpr auto kIsLittleEndian = true;
+#endif
+#else
+constexpr auto kIsLittleEndian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__;
+#endif
+constexpr auto kIsBigEndian = !kIsLittleEndian;
+}
+
 #ifndef FOLLY_SSE
 # if defined(__SSE4_2__)
 #  define FOLLY_SSE 4
@@ -377,13 +448,32 @@ inline void asm_pause() {
 #endif
 }
 
+#ifdef _MSC_VER
+constexpr size_t constexpr_strlen_internal(const char* s, size_t len) {
+  return *s == '\0' ? len : constexpr_strlen_internal(s + 1, len + 1);
+}
+static_assert(constexpr_strlen_internal("123456789", 0) == 9,
+              "Someone appears to have broken constexpr_strlen...");
+#endif
+
 constexpr size_t constexpr_strlen(const char* s) {
 #if defined(__clang__)
   return __builtin_strlen(s);
+#elif defined(_MSC_VER)
+  return s == nullptr ? 0 : constexpr_strlen_internal(s, 0);
 #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_