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)
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
112 // packing is very ugly in msvc
114 # define FOLLY_PACK_ATTR /**/
115 # define FOLLY_PACK_PUSH __pragma(pack(push, 1))
116 # define FOLLY_PACK_POP __pragma(pack(pop))
117 #elif defined(__clang__) || defined(__GNUC__)
118 # define FOLLY_PACK_ATTR __attribute__((__packed__))
119 # define FOLLY_PACK_PUSH /**/
120 # define FOLLY_PACK_POP /**/
122 # define FOLLY_PACK_ATTR /**/
123 # define FOLLY_PACK_PUSH /**/
124 # define FOLLY_PACK_POP /**/
127 // Generalize warning push/pop.
128 #if defined(_MSC_VER)
129 # define FOLLY_PUSH_WARNING __pragma(warning(push))
130 # define FOLLY_POP_WARNING __pragma(warning(pop))
131 // Disable the GCC warnings.
132 # define FOLLY_GCC_DISABLE_WARNING(warningName)
133 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber) __pragma(warning(disable: warningNumber))
134 #elif defined(__clang__) || defined(__GNUC__)
135 # define FOLLY_PUSH_WARNING _Pragma("GCC diagnostic push")
136 # define FOLLY_POP_WARNING _Pragma("GCC diagnostic pop")
137 #define FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName) #warningName
138 #define FOLLY_GCC_DISABLE_WARNING_INTERNAL2(warningName) \
139 FOLLY_GCC_DISABLE_WARNING_INTERNAL3(warningName)
140 #define FOLLY_GCC_DISABLE_WARNING(warningName) \
141 _Pragma(FOLLY_GCC_DISABLE_WARNING_INTERNAL2(GCC diagnostic ignored \
142 FOLLY_GCC_DISABLE_WARNING_INTERNAL3(-W##warningName)))
143 // Disable the MSVC warnings.
144 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
146 # define FOLLY_PUSH_WARNING
147 # define FOLLY_POP_WARNING
148 # define FOLLY_GCC_DISABLE_WARNING(warningName)
149 # define FOLLY_MSVC_DISABLE_WARNING(warningNumber)
152 #ifdef HAVE_SHADOW_LOCAL_WARNINGS
153 #define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS \
154 FOLLY_GCC_DISABLE_WARNING(shadow-compatible-local) \
155 FOLLY_GCC_DISABLE_WARNING(shadow-local)
157 #define FOLLY_GCC_DISABLE_NEW_SHADOW_WARNINGS /* empty */
160 #if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
161 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
162 // gcc 4.8.x incorrectly placed max_align_t in the root namespace
163 // Alias it into std (where it's found in 4.9 and later)
164 namespace std { typedef ::max_align_t max_align_t; }
167 // portable version check for clang
168 #ifndef __CLANG_PREREQ
169 # if defined __clang__ && defined __clang_major__ && defined __clang_minor__
171 # define __CLANG_PREREQ(maj, min) \
172 ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
175 # define __CLANG_PREREQ(maj, min) 0
179 /* Platform specific TLS support
180 * gcc implements __thread
181 * msvc implements __declspec(thread)
182 * the semantics are the same
183 * (but remember __thread has different semantics when using emutls (ex. apple))
185 #if defined(_MSC_VER)
186 # define FOLLY_TLS __declspec(thread)
187 #elif defined(__GNUC__) || defined(__clang__)
188 # define FOLLY_TLS __thread
190 # error cannot define platform specific thread local storage
197 // It turns out that GNU libstdc++ and LLVM libc++ differ on how they implement
198 // the 'std' namespace; the latter uses inline namespaces. Wrap this decision
199 // up in a macro to make forward-declarations easier.
202 #define FOLLY_NAMESPACE_STD_BEGIN _LIBCPP_BEGIN_NAMESPACE_STD
203 #define FOLLY_NAMESPACE_STD_END _LIBCPP_END_NAMESPACE_STD
205 #define FOLLY_NAMESPACE_STD_BEGIN namespace std {
206 #define FOLLY_NAMESPACE_STD_END }
209 // If the new c++ ABI is used, __cxx11 inline namespace needs to be added to
210 // some types, e.g. std::list.
211 #if _GLIBCXX_USE_CXX11_ABI
212 #define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN \
213 inline _GLIBCXX_BEGIN_NAMESPACE_CXX11
214 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END _GLIBCXX_END_NAMESPACE_CXX11
216 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_BEGIN
217 # define FOLLY_GLIBCXX_NAMESPACE_CXX11_END
220 // MSVC specific defines
221 // mainly for posix compat
223 #include <folly/portability/SysTypes.h>
225 // compiler specific to compiler specific
227 # define __PRETTY_FUNCTION__ __FUNCSIG__
229 // Hide a GCC specific thing that breaks MSVC if left alone.
230 # define __extension__
232 // We have compiler support for the newest of the new, but
233 // MSVC doesn't tell us that.
241 constexpr auto kIsDebug = false;
243 constexpr auto kIsDebug = true;
250 // It's MSVC, so we just have to guess ... and allow an override
251 #ifdef FOLLY_ENDIAN_BE
252 constexpr auto kIsLittleEndian = false;
254 constexpr auto kIsLittleEndian = true;
257 constexpr auto kIsLittleEndian = __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__;
259 constexpr auto kIsBigEndian = !kIsLittleEndian;
263 # if defined(__SSE4_2__)
265 # define FOLLY_SSE_MINOR 2
266 # elif defined(__SSE4_1__)
268 # define FOLLY_SSE_MINOR 1
269 # elif defined(__SSE4__)
271 # define FOLLY_SSE_MINOR 0
272 # elif defined(__SSE3__)
274 # define FOLLY_SSE_MINOR 0
275 # elif defined(__SSE2__)
277 # define FOLLY_SSE_MINOR 0
278 # elif defined(__SSE__)
280 # define FOLLY_SSE_MINOR 0
283 # define FOLLY_SSE_MINOR 0
287 #define FOLLY_SSE_PREREQ(major, minor) \
288 (FOLLY_SSE > major || FOLLY_SSE == major && FOLLY_SSE_MINOR >= minor)
290 #if FOLLY_UNUSUAL_GFLAGS_NAMESPACE
291 namespace FOLLY_GFLAGS_NAMESPACE { }
293 using namespace FOLLY_GFLAGS_NAMESPACE;
294 } // namespace gflags
297 // for TARGET_OS_IPHONE
299 #include <TargetConditionals.h>
302 // RTTI may not be enabled for this compilation unit.
303 #if defined(__GXX_RTTI) || defined(__cpp_rtti) || \
304 (defined(_MSC_VER) && defined(_CPPRTTI))
305 # define FOLLY_HAS_RTTI 1
308 #if defined(__APPLE__) || defined(_MSC_VER)
309 #define FOLLY_STATIC_CTOR_PRIORITY_MAX
311 // 101 is the highest priority allowed by the init_priority attribute.
312 // This priority is already used by JEMalloc and other memory allocators so
313 // we will take the next one.
314 #define FOLLY_STATIC_CTOR_PRIORITY_MAX __attribute__((__init_priority__(102)))
319 #if defined(__linux__) && !FOLLY_MOBILE
320 constexpr auto kIsLinux = true;
322 constexpr auto kIsLinux = false;
326 constexpr auto kIsWindows = true;
328 constexpr auto kIsWindows = false;