/*
- * 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.
#ifndef FOLLY_PORTABILITY_H_
#define FOLLY_PORTABILITY_H_
+// @nocommit invalidate ccache 20151125 (see #8764509)
+
+#include <string.h>
+
+#include <cstddef>
+
#ifndef FOLLY_NO_CONFIG
#include <folly/folly-config.h>
#endif
#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__)
#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
// 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
+# define FOLLY_DEPRECATED(msg)
#endif
// noreturn
#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
# 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 /**/
# 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__
# 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. */
-#if !defined(FOLLY_FINAL) && !defined(FOLLY_OVERRIDE)
-# if defined(__clang__) || __GNUC_PREREQ(4, 7)
-# 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
# 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)
#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>
#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
// 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
+// 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
+# 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
+
+#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 {
#endif
// RTTI may not be enabled for this compilation unit.
-#if defined(__GXX_RTTI) || defined(__cpp_rtti)
+#if defined(__GXX_RTTI) || defined(__cpp_rtti) || \
+ (defined(_MSC_VER) && defined(_CPPRTTI))
# define FOLLY_HAS_RTTI 1
#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();
asm volatile ("pause");
#elif FOLLY_A64
asm volatile ("wfe");
+#elif FOLLY_PPC64
+ asm volatile("or 27,27,27");
#endif
}
inline void asm_pause() {
asm ("pause");
#elif FOLLY_A64
asm ("wfe");
+#elif FOLLY_PPC64
+ asm ("or 31,31,31");
#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_
projects / folly.git / blobdiff