2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
23 #include <folly/portability/Config.h>
25 #include <folly/CPortability.h>
27 #if FOLLY_HAVE_SCHED_H
31 // Unaligned loads and stores
33 #if FOLLY_HAVE_UNALIGNED_ACCESS
34 constexpr bool kHasUnalignedAccess = true;
36 constexpr bool kHasUnalignedAccess = false;
40 // compiler specific attribute translation
41 // msvc should come first, so if clang is in msvc mode it gets the right defines
43 #if defined(__clang__) || defined(__GNUC__)
44 # define FOLLY_ALIGNED(size) __attribute__((__aligned__(size)))
45 #elif defined(_MSC_VER)
46 # define FOLLY_ALIGNED(size) __declspec(align(size))
48 # error Cannot define FOLLY_ALIGNED on this platform
50 #define FOLLY_ALIGNED_MAX FOLLY_ALIGNED(alignof(std::max_align_t))
52 // NOTE: this will only do checking in msvc with versions that support /analyze
54 # ifdef _USE_ATTRIBUTES_FOR_SAL
55 # undef _USE_ATTRIBUTES_FOR_SAL
58 # define _USE_ATTRIBUTES_FOR_SAL 1
60 # define FOLLY_PRINTF_FORMAT _Printf_format_string_
61 # define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) /**/
63 # define FOLLY_PRINTF_FORMAT /**/
64 # define FOLLY_PRINTF_FORMAT_ATTR(format_param, dots_param) \
65 __attribute__((__format__(__printf__, format_param, dots_param)))
69 #if defined(__clang__) || defined(__GNUC__)
70 # define FOLLY_DEPRECATED(msg) __attribute__((__deprecated__(msg)))
71 #elif defined(_MSC_VER)
72 # define FOLLY_DEPRECATED(msg) __declspec(deprecated(msg))
74 # define FOLLY_DEPRECATED(msg)
79 # define FOLLY_NOINLINE __declspec(noinline)
80 #elif defined(__clang__) || defined(__GNUC__)
81 # define FOLLY_NOINLINE __attribute__((__noinline__))
83 # define FOLLY_NOINLINE
88 # define FOLLY_ALWAYS_INLINE __forceinline
89 #elif defined(__clang__) || defined(__GNUC__)
90 # define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
92 # define FOLLY_ALWAYS_INLINE inline
97 # define FOLLY_TARGET_ATTRIBUTE(target)
99 # define FOLLY_TARGET_ATTRIBUTE(target) __attribute__((__target__(target)))
102 // detection for 64 bit
103 #if defined(__x86_64__) || defined(_M_X64)
109 #if defined(__aarch64__)
115 #if defined (__powerpc64__)
116 # define FOLLY_PPC64 1
118 # define FOLLY_PPC64 0
121 // packing is very ugly in msvc
123 # define FOLLY_PACK_ATTR /**/
124 # define FOLLY_PACK_PUSH __pragma(pack(push, 1))
125 # define FOLLY_PACK_POP __pragma(pack(pop))
126 #elif defined(__clang__) || defined(__GNUC__)
127 # define FOLLY_PACK_ATTR __attribute__((__packed__))
128 # define FOLLY_PACK_PUSH /**/
129 # define FOLLY_PACK_POP /**/
131 # define FOLLY_PACK_ATTR /**/
132 # define FOLLY_PACK_PUSH /**/
133 # define FOLLY_PACK_POP /**/
136 // Generalize warning push/pop.
137 #if defined(_MSC_VER)
138 # define FOLLY_PUSH_WARNING __pragma(warning(push))
139 # define FOLLY_POP_WARNING __pragma(warning(pop))
140 // Disable the GCC warnings.
141 # define FOLLY_GCC_DISABLE_WARNING(warningName)
142 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber) __pragma(warning(disable: warningNumber))
143 #elif defined(__clang__) || defined(__GNUC__)
144 # define FOLLY_PUSH_WARNING _Pragma("GCC diagnostic push")
145 # define FOLLY_POP_WARNING _Pragma("GCC diagnostic pop")
146 #define FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName) #warningName
147 #define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) \
148 FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName)
149 #define FOLLY_GCC_DISABLE_WARNING(warningName) \
150 _Pragma(FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored \
151 FOLLY_GCC_DISABLE_WARNING_INTERNAL3(-W##warningName)))
152 // Disable the MSVC warnings.
153 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
155 # define FOLLY_PUSH_WARNING
156 # define FOLLY_POP_WARNING
157 # define FOLLY_GCC_DISABLE_WARNING(warningName)
158 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
161 // portable version check
162 #ifndef __GNUC_PREREQ
163 # if defined __GNUC__ && defined __GNUC_MINOR__
165 # define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= \
166 ((maj) << 16) + (min))
169 # define __GNUC_PREREQ(maj, min) 0
173 #if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
174 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
175 // gcc 4.8.x incorrectly placed max_align_t in the root namespace
176 // Alias it into std (where it's found in 4.9 and later)
177 namespace std { typedef ::max_align_t max_align_t; }
180 // portable version check for clang
181 #ifndef __CLANG_PREREQ
182 # if defined __clang__ && defined __clang_major__ && defined __clang_minor__
184 # define __CLANG_PREREQ(maj, min) \
185 ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
188 # define __CLANG_PREREQ(maj, min) 0
192 /* Platform specific TLS support
193 * gcc implements __thread
194 * msvc implements __declspec(thread)
195 * the semantics are the same
196 * (but remember __thread has different semantics when using emutls (ex. apple))
198 #if defined(_MSC_VER)
199 # define FOLLY_TLS __declspec(thread)
200 #elif defined(__GNUC__) || defined(__clang__)
201 # define FOLLY_TLS __thread
203 # error cannot define platform specific thread local storage
210 // It turns out that GNU libstdc++ and LLVM libc++ differ on how they implement
211 // the 'std' namespace; the latter uses inline namespaces. Wrap this decision
212 // up in a macro to make forward-declarations easier.
215 #define FOLLY_NAMESPACE_STD_BEGIN _LIBCPP_BEGIN_NAMESPACE_STD
216 #define FOLLY_NAMESPACE_STD_END _LIBCPP_END_NAMESPACE_STD
218 #define FOLLY_NAMESPACE_STD_BEGIN namespace std {
219 #define FOLLY_NAMESPACE_STD_END }
222 // If the new c++ ABI is used, __cxx11 inline namespace needs to be added to
223 // some types, e.g. std::list.
224 #if _GLIBCXX_USE_CXX11_ABI
225 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN _GLIBCXX_BEGIN_NAMESPACE_CXX11
226 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END _GLIBCXX_END_NAMESPACE_CXX11
228 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN
229 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END
232 // Provide our own std::__throw_* wrappers for platforms that don't have them
233 #if FOLLY_HAVE_BITS_FUNCTEXCEPT_H
234 #include <bits/functexcept.h>
236 #include <folly/detail/FunctionalExcept.h>
239 #if defined(__cplusplus)
240 // Unfortunately, boost::has_trivial_copy<T> is broken in libc++ due to its
241 // usage of __has_trivial_copy(), so we can't use it as a
242 // least-common-denominator for C++11 implementations that don't support
243 // std::is_trivially_copyable<T>.
245 // http://stackoverflow.com/questions/12754886/has-trivial-copy-behaves-differently-in-clang-and-gcc-whos-right
247 // As a result, use std::is_trivially_copyable() where it exists, and fall back
248 // to Boost otherwise.
249 #if FOLLY_HAVE_STD__IS_TRIVIALLY_COPYABLE
250 #include <type_traits>
251 #define FOLLY_IS_TRIVIALLY_COPYABLE(T) \
252 (std::is_trivially_copyable<T>::value)
254 #include <boost/type_traits.hpp>
255 #define FOLLY_IS_TRIVIALLY_COPYABLE(T) \
256 (boost::has_trivial_copy<T>::value && \
257 boost::has_trivial_destructor<T>::value)
259 #endif // __cplusplus
261 // MSVC specific defines
262 // mainly for posix compat
264 #include <folly/portability/SysTypes.h>
266 // compiler specific to compiler specific
268 # define __PRETTY_FUNCTION__ __FUNCSIG__
270 // Hide a GCC specific thing that breaks MSVC if left alone.
271 # define __extension__
273 // We have compiler support for the newest of the new, but
274 // MSVC doesn't tell us that.
282 constexpr auto kIsDebug = false;
284 constexpr auto kIsDebug = true;
291 // It's MSVC, so we just have to guess ... and allow an override
292 #ifdef FOLLY_ENDIAN_BE
293 constexpr auto kIsLittleEndian = false;
295 constexpr auto kIsLittleEndian = true;
298 constexpr auto kIsLittleEndian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__;
300 constexpr auto kIsBigEndian = !kIsLittleEndian;
304 # if defined(__SSE4_2__)
306 # define FOLLY_SSE_MINOR 2
307 # elif defined(__SSE4_1__)
309 # define FOLLY_SSE_MINOR 1
310 # elif defined(__SSE4__)
312 # define FOLLY_SSE_MINOR 0
313 # elif defined(__SSE3__)
315 # define FOLLY_SSE_MINOR 0
316 # elif defined(__SSE2__)
318 # define FOLLY_SSE_MINOR 0
319 # elif defined(__SSE__)
321 # define FOLLY_SSE_MINOR 0
324 # define FOLLY_SSE_MINOR 0
328 #define FOLLY_SSE_PREREQ(major, minor) \
329 (FOLLY_SSE > major || FOLLY_SSE == major && FOLLY_SSE_MINOR >= minor)
331 #if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
332 namespace FOLLY_GFLAGS_NAMESPACE { }
334 using namespace FOLLY_GFLAGS_NAMESPACE;
335 } // namespace gflags
338 // for TARGET_OS_IPHONE
340 #include <TargetConditionals.h>
343 // RTTI may not be enabled for this compilation unit.
344 #if defined(__GXX_RTTI) || defined(__cpp_rtti) || \
345 (defined(_MSC_VER) && defined(_CPPRTTI))
346 # define FOLLY_HAS_RTTI 1
349 #if defined(__APPLE__) || defined(_MSC_VER)
350 #define FOLLY_STATIC_CTOR_PRIORITY_MAX
352 // 101 is the highest priority allowed by the init_priority attribute.
353 // This priority is already used by JEMalloc and other memory allocators so
354 // we will take the next one.
355 #define FOLLY_STATIC_CTOR_PRIORITY_MAX __attribute__((__init_priority__(102)))
361 constexpr auto kIsLinux = true;
363 constexpr auto kIsLinux = false;