2 * Copyright 2017 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)
78 #if defined(_MSC_VER) && (_MSC_VER >= 1700)
79 #define FOLLY_WARN_UNUSED_RESULT _Check_return_
80 #elif defined(__clang__) || defined(__GNUC__)
81 #define FOLLY_WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
83 #define FOLLY_WARN_UNUSED_RESULT
88 # define FOLLY_TARGET_ATTRIBUTE(target)
90 # define FOLLY_TARGET_ATTRIBUTE(target) __attribute__((__target__(target)))
93 // detection for 64 bit
94 #if defined(__x86_64__) || defined(_M_X64)
100 #if defined(__aarch64__)
106 #if defined (__powerpc64__)
107 # define FOLLY_PPC64 1
109 # define FOLLY_PPC64 0
113 constexpr bool kIsArchAmd64 = FOLLY_X64 == 1;
114 constexpr bool kIsArchAArch64 = FOLLY_A64 == 1;
115 constexpr bool kIsArchPPC64 = FOLLY_PPC64 == 1;
118 // packing is very ugly in msvc
120 # define FOLLY_PACK_ATTR /**/
121 # define FOLLY_PACK_PUSH __pragma(pack(push, 1))
122 # define FOLLY_PACK_POP __pragma(pack(pop))
123 #elif defined(__clang__) || defined(__GNUC__)
124 # define FOLLY_PACK_ATTR __attribute__((__packed__))
125 # define FOLLY_PACK_PUSH /**/
126 # define FOLLY_PACK_POP /**/
128 # define FOLLY_PACK_ATTR /**/
129 # define FOLLY_PACK_PUSH /**/
130 # define FOLLY_PACK_POP /**/
133 // Generalize warning push/pop.
134 #if defined(_MSC_VER)
135 # define FOLLY_PUSH_WARNING __pragma(warning(push))
136 # define FOLLY_POP_WARNING __pragma(warning(pop))
137 // Disable the GCC warnings.
138 # define FOLLY_GCC_DISABLE_WARNING(warningName)
139 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber) __pragma(warning(disable: warningNumber))
140 #elif defined(__clang__) || defined(__GNUC__)
141 # define FOLLY_PUSH_WARNING _Pragma("GCC diagnostic push")
142 # define FOLLY_POP_WARNING _Pragma("GCC diagnostic pop")
143 #define FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName) #warningName
144 #define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) \
145 FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName)
146 #define FOLLY_GCC_DISABLE_WARNING(warningName) \
147 _Pragma(FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored \
148 FOLLY_GCC_DISABLE_WARNING_INTERNAL3(-W##warningName)))
149 // Disable the MSVC warnings.
150 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
152 # define FOLLY_PUSH_WARNING
153 # define FOLLY_POP_WARNING
154 # define FOLLY_GCC_DISABLE_WARNING(warningName)
155 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
158 #ifdef HAVE_SHADOW_LOCAL_WARNINGS
159 #define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS \
160 FOLLY_GCC_DISABLE_WARNING(shadow-compatible-local) \
161 FOLLY_GCC_DISABLE_WARNING(shadow-local)
163 #define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS /* empty */
166 #if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
167 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
168 // gcc 4.8.x incorrectly placed max_align_t in the root namespace
169 // Alias it into std (where it's found in 4.9 and later)
170 namespace std { typedef ::max_align_t max_align_t; }
173 // portable version check for clang
174 #ifndef __CLANG_PREREQ
175 # if defined __clang__ && defined __clang_major__ && defined __clang_minor__
177 # define __CLANG_PREREQ(maj, min) \
178 ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
181 # define __CLANG_PREREQ(maj, min) 0
185 /* Platform specific TLS support
186 * gcc implements __thread
187 * msvc implements __declspec(thread)
188 * the semantics are the same
189 * (but remember __thread has different semantics when using emutls (ex. apple))
191 #if defined(_MSC_VER)
192 # define FOLLY_TLS __declspec(thread)
193 #elif defined(__GNUC__) || defined(__clang__)
194 # define FOLLY_TLS __thread
196 # error cannot define platform specific thread local storage
203 // It turns out that GNU libstdc++ and LLVM libc++ differ on how they implement
204 // the 'std' namespace; the latter uses inline namespaces. Wrap this decision
205 // up in a macro to make forward-declarations easier.
208 #define FOLLY_NAMESPACE_STD_BEGIN _LIBCPP_BEGIN_NAMESPACE_STD
209 #define FOLLY_NAMESPACE_STD_END _LIBCPP_END_NAMESPACE_STD
211 #define FOLLY_NAMESPACE_STD_BEGIN namespace std {
212 #define FOLLY_NAMESPACE_STD_END }
215 // If the new c++ ABI is used, __cxx11 inline namespace needs to be added to
216 // some types, e.g. std::list.
217 #if _GLIBCXX_USE_CXX11_ABI
218 #define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN \
219 inline _GLIBCXX_BEGIN_NAMESPACE_CXX11
220 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END _GLIBCXX_END_NAMESPACE_CXX11
222 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN
223 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END
226 // MSVC specific defines
227 // mainly for posix compat
229 #include <folly/portability/SysTypes.h>
231 // compiler specific to compiler specific
233 # define __PRETTY_FUNCTION__ __FUNCSIG__
235 // Hide a GCC specific thing that breaks MSVC if left alone.
236 # define __extension__
238 // We have compiler support for the newest of the new, but
239 // MSVC doesn't tell us that.
247 constexpr auto kIsDebug = false;
249 constexpr auto kIsDebug = true;
256 // It's MSVC, so we just have to guess ... and allow an override
257 #ifdef FOLLY_ENDIAN_BE
258 constexpr auto kIsLittleEndian = false;
260 constexpr auto kIsLittleEndian = true;
263 constexpr auto kIsLittleEndian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__;
265 constexpr auto kIsBigEndian = !kIsLittleEndian;
269 # if defined(__SSE4_2__)
271 # define FOLLY_SSE_MINOR 2
272 # elif defined(__SSE4_1__)
274 # define FOLLY_SSE_MINOR 1
275 # elif defined(__SSE4__)
277 # define FOLLY_SSE_MINOR 0
278 # elif defined(__SSE3__)
280 # define FOLLY_SSE_MINOR 0
281 # elif defined(__SSE2__)
283 # define FOLLY_SSE_MINOR 0
284 # elif defined(__SSE__)
286 # define FOLLY_SSE_MINOR 0
289 # define FOLLY_SSE_MINOR 0
293 #define FOLLY_SSE_PREREQ(major, minor) \
294 (FOLLY_SSE > major || FOLLY_SSE == major && FOLLY_SSE_MINOR >= minor)
296 #if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
297 namespace FOLLY_GFLAGS_NAMESPACE { }
299 using namespace FOLLY_GFLAGS_NAMESPACE;
300 } // namespace gflags
303 // for TARGET_OS_IPHONE
305 #include <TargetConditionals.h>
308 // RTTI may not be enabled for this compilation unit.
309 #if defined(__GXX_RTTI) || defined(__cpp_rtti) || \
310 (defined(_MSC_VER) && defined(_CPPRTTI))
311 # define FOLLY_HAS_RTTI 1
314 #if defined(__APPLE__) || defined(_MSC_VER)
315 #define FOLLY_STATIC_CTOR_PRIORITY_MAX
317 // 101 is the highest priority allowed by the init_priority attribute.
318 // This priority is already used by JEMalloc and other memory allocators so
319 // we will take the next one.
320 #define FOLLY_STATIC_CTOR_PRIORITY_MAX __attribute__((__init_priority__(102)))
325 #if defined(__linux__) && !FOLLY_MOBILE
326 constexpr auto kIsLinux = true;
328 constexpr auto kIsLinux = false;
332 constexpr auto kIsWindows = true;
334 constexpr auto kIsWindows = false;