X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2FPortability.h;h=6ce3d51dfb67c7def26d835e1e928267003d6d8c;hb=a42878e365ad97ef653a823ac5d5b62f91f63663;hp=f4064a2222948e15a090c833708f954802fd91bd;hpb=9cdd19b750f66db9171344c9db2d21c27de467d9;p=folly.git

diff --git a/folly/Portability.h b/folly/Portability.h
index f4064a22..6ce3d51d 100644
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 Facebook, Inc.
+ * Copyright 2014 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,43 +17,127 @@
 #ifndef FOLLY_PORTABILITY_H_
 #define FOLLY_PORTABILITY_H_
 
+#ifndef FOLLY_NO_CONFIG
 #include "folly-config.h"
+#endif
+
+#ifdef FOLLY_PLATFORM_CONFIG
+#include FOLLY_PLATFORM_CONFIG
+#endif
 
-#ifdef FOLLY_HAVE_FEATURES_H
+#if FOLLY_HAVE_FEATURES_H
 #include <features.h>
 #endif
 
+#include "CPortability.h"
 
-#ifdef FOLLY_HAVE_SCHED_H
+#if FOLLY_HAVE_SCHED_H
  #include <sched.h>
  #ifndef FOLLY_HAVE_PTHREAD_YIELD
   #define pthread_yield sched_yield
  #endif
 #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
 
 // MaxAlign: max_align_t isn't supported by gcc
 #ifdef __GNUC__
-struct MaxAlign { char c; } __attribute__((aligned));
+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
+
+// NOTE: this will only do checking in msvc with versions that support /analyze
+#if _MSC_VER
+# ifdef _USE_ATTRIBUTES_FOR_SAL
+#    undef _USE_ATTRIBUTES_FOR_SAL
+# endif
+# define _USE_ATTRIBUTES_FOR_SAL 1
+# include <sal.h>
+# define FOLLY_PRINTF_FORMAT _Printf_format_string_
+# define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) /**/
+#else
+# define FOLLY_PRINTF_FORMAT /**/
+# define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) \
+  __attribute__((__format__(__printf__, format_param, dots_param)))
+#endif
 
 // noreturn
-#if defined(__clang__) || defined(__GNUC__)
-# define FOLLY_NORETURN __attribute__((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)
+#elif defined(__clang__) || defined(__GNUC__)
+# define FOLLY_NOINLINE __attribute__((__noinline__))
+#else
+# define FOLLY_NOINLINE
+#endif
+
+// always inline
+#ifdef _MSC_VER
+# define FOLLY_ALWAYS_INLINE __forceinline
+#elif defined(__clang__) || defined(__GNUC__)
+# define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
+#else
+# define FOLLY_ALWAYS_INLINE
+#endif
+
+// detection for 64 bit
+#if defined(__x86_64__) || defined(_M_X64)
+# define FOLLY_X64 1
+#else
+# define FOLLY_X64 0
+#endif
+
+// packing is very ugly in msvc
+#ifdef _MSC_VER
+# define FOLLY_PACK_ATTR /**/
+# define FOLLY_PACK_PUSH __pragma(pack(push, 1))
+# define FOLLY_PACK_POP __pragma(pack(pop))
+#elif defined(__clang__) || defined(__GNUC__)
+# define FOLLY_PACK_ATTR __attribute__((__packed__))
+# define FOLLY_PACK_PUSH /**/
+# define FOLLY_PACK_POP /**/
+#else
+# define FOLLY_PACK_ATTR /**/
+# define FOLLY_PACK_PUSH /**/
+# define FOLLY_PACK_POP /**/
+#endif
+
+// portable version check
+#ifndef __GNUC_PREREQ
+# if defined __GNUC__ && defined __GNUC_MINOR__
+#  define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= \
+                                   ((maj) << 16) + (min))
+# else
+#  define __GNUC_PREREQ(maj, min) 0
+# endif
+#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__) || \
-     (defined(__GNUC__) && defined(__GNUC_MINOR__) && \
-      ((__GNUC__ << 16) + __GNUC_MINOR__) >= ((4 << 16) + 7))
+# if defined(__clang__) || __GNUC_PREREQ(4, 7)
 #  define FOLLY_FINAL final
 #  define FOLLY_OVERRIDE override
 # else
@@ -62,13 +146,103 @@ struct MaxAlign { char c; } __attribute__((aligned));
 # endif
 #endif
 
+/* Platform specific TLS support
+ * gcc implements __thread
+ * msvc implements __declspec(thread)
+ * the semantics are the same (but remember __thread is broken on apple)
+ */
+#if defined(_MSC_VER)
+# define FOLLY_TLS __declspec(thread)
+#elif defined(__GNUC__) || defined(__clang__)
+# define FOLLY_TLS __thread
+#else
+# error cannot define platform specific thread local storage
+#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) && __GLIBC_PREREQ(2, 10)
-#  define FOLLY_HAVE_PREADV 1
-#  define FOLLY_HAVE_PWRITEV 1
+# 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 namepsaces. Wrap this decision
+// up in a macro to make forward-declarations easier.
+#if FOLLY_USE_LIBCPP
+#include <__config>
+#define FOLLY_NAMESPACE_STD_BEGIN     _LIBCPP_BEGIN_NAMESPACE_STD
+#define FOLLY_NAMESPACE_STD_END       _LIBCPP_END_NAMESPACE_STD
+#else
+#define FOLLY_NAMESPACE_STD_BEGIN     namespace std {
+#define FOLLY_NAMESPACE_STD_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
+
+// this definition is in a really silly place with a silly name
+// and ifdefing it every time we want it is painful
+#include <basetsd.h>
+typedef SSIZE_T ssize_t;
+
+// 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
+# define __PRETTY_FUNCTION__ __FUNCSIG__
+#endif
+
+#if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
+namespace FOLLY_GFLAGS_NAMESPACE { }
+namespace gflags {
+using namespace FOLLY_GFLAGS_NAMESPACE;
+}  // namespace gflags
+#endif
+
 #endif // FOLLY_PORTABILITY_H_