GRPC C++  1.19.0
port_platform.h
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1 /*
2  *
3  * Copyright 2015 gRPC authors.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 
19 #ifndef GRPC_IMPL_CODEGEN_PORT_PLATFORM_H
20 #define GRPC_IMPL_CODEGEN_PORT_PLATFORM_H
21 
22 /*
23  * Define GPR_BACKWARDS_COMPATIBILITY_MODE to try harder to be ABI
24  * compatible with older platforms (currently only on Linux)
25  * Causes:
26  * - some libc calls to be gotten via dlsym
27  * - some syscalls to be made directly
28  */
29 
30 /* Get windows.h included everywhere (we need it) */
31 #if defined(_WIN64) || defined(WIN64) || defined(_WIN32) || defined(WIN32)
32 #ifndef WIN32_LEAN_AND_MEAN
33 #define GRPC_WIN32_LEAN_AND_MEAN_WAS_NOT_DEFINED
34 #define WIN32_LEAN_AND_MEAN
35 #endif /* WIN32_LEAN_AND_MEAN */
36 
37 #ifndef NOMINMAX
38 #define GRPC_NOMINMX_WAS_NOT_DEFINED
39 #define NOMINMAX
40 #endif /* NOMINMAX */
41 
42 #ifndef _WIN32_WINNT
43 #error \
44  "Please compile grpc with _WIN32_WINNT of at least 0x600 (aka Windows Vista)"
45 #else /* !defined(_WIN32_WINNT) */
46 #if (_WIN32_WINNT < 0x0600)
47 #error \
48  "Please compile grpc with _WIN32_WINNT of at least 0x600 (aka Windows Vista)"
49 #endif /* _WIN32_WINNT < 0x0600 */
50 #endif /* defined(_WIN32_WINNT) */
51 
52 #include <windows.h>
53 
54 #ifdef GRPC_WIN32_LEAN_AND_MEAN_WAS_NOT_DEFINED
55 #undef GRPC_WIN32_LEAN_AND_MEAN_WAS_NOT_DEFINED
56 #undef WIN32_LEAN_AND_MEAN
57 #endif /* GRPC_WIN32_LEAN_AND_MEAN_WAS_NOT_DEFINED */
58 
59 #ifdef GRPC_NOMINMAX_WAS_NOT_DEFINED
60 #undef GRPC_NOMINMAX_WAS_NOT_DEFINED
61 #undef NOMINMAX
62 #endif /* GRPC_WIN32_LEAN_AND_MEAN_WAS_NOT_DEFINED */
63 #endif /* defined(_WIN64) || defined(WIN64) || defined(_WIN32) || \
64  defined(WIN32) */
65 
66 /* Override this file with one for your platform if you need to redefine
67  things. */
68 
69 #if !defined(GPR_NO_AUTODETECT_PLATFORM)
70 #if defined(_WIN64) || defined(WIN64) || defined(_WIN32) || defined(WIN32)
71 #if defined(_WIN64) || defined(WIN64)
72 #define GPR_ARCH_64 1
73 #else
74 #define GPR_ARCH_32 1
75 #endif
76 #define GPR_PLATFORM_STRING "windows"
77 #define GPR_WINDOWS 1
78 #define GPR_WINDOWS_SUBPROCESS 1
79 #define GPR_WINDOWS_ENV
80 #ifdef __MSYS__
81 #define GPR_GETPID_IN_UNISTD_H 1
82 #define GPR_MSYS_TMPFILE
83 #define GPR_POSIX_LOG
84 #define GPR_POSIX_STRING
85 #define GPR_POSIX_TIME
86 #else
87 #define GPR_GETPID_IN_PROCESS_H 1
88 #define GPR_WINDOWS_TMPFILE
89 #define GPR_WINDOWS_LOG
90 #define GPR_WINDOWS_CRASH_HANDLER 1
91 #define GPR_WINDOWS_STRING
92 #define GPR_WINDOWS_TIME
93 #endif
94 #ifdef __GNUC__
95 #define GPR_GCC_ATOMIC 1
96 #define GPR_GCC_TLS 1
97 #else
98 #define GPR_WINDOWS_ATOMIC 1
99 #define GPR_MSVC_TLS 1
100 #endif
101 #elif defined(GPR_MANYLINUX1)
102 // TODO(atash): manylinux1 is just another __linux__ but with ancient
103 // libraries; it should be integrated with the `__linux__` definitions below.
104 #define GPR_PLATFORM_STRING "manylinux"
105 #define GPR_POSIX_CRASH_HANDLER 1
106 #define GPR_CPU_POSIX 1
107 #define GPR_GCC_ATOMIC 1
108 #define GPR_GCC_TLS 1
109 #define GPR_LINUX 1
110 #define GPR_LINUX_LOG 1
111 #define GPR_SUPPORT_CHANNELS_FROM_FD 1
112 #define GPR_LINUX_ENV 1
113 #define GPR_POSIX_TMPFILE 1
114 #define GPR_POSIX_STRING 1
115 #define GPR_POSIX_SUBPROCESS 1
116 #define GPR_POSIX_SYNC 1
117 #define GPR_POSIX_TIME 1
118 #define GPR_GETPID_IN_UNISTD_H 1
119 #ifdef _LP64
120 #define GPR_ARCH_64 1
121 #else /* _LP64 */
122 #define GPR_ARCH_32 1
123 #endif /* _LP64 */
124 #include <linux/version.h>
125 #elif defined(ANDROID) || defined(__ANDROID__)
126 #define GPR_PLATFORM_STRING "android"
127 #define GPR_ANDROID 1
128 // TODO(apolcyn): re-evaluate support for c-ares
129 // on android after upgrading our c-ares dependency.
130 // See https://github.com/grpc/grpc/issues/18038.
131 #define GRPC_ARES 0
132 #ifdef _LP64
133 #define GPR_ARCH_64 1
134 #else /* _LP64 */
135 #define GPR_ARCH_32 1
136 #endif /* _LP64 */
137 #define GPR_CPU_POSIX 1
138 #define GPR_GCC_SYNC 1
139 #define GPR_GCC_TLS 1
140 #define GPR_POSIX_ENV 1
141 #define GPR_POSIX_TMPFILE 1
142 #define GPR_ANDROID_LOG 1
143 #define GPR_POSIX_STRING 1
144 #define GPR_POSIX_SUBPROCESS 1
145 #define GPR_POSIX_SYNC 1
146 #define GPR_POSIX_TIME 1
147 #define GPR_GETPID_IN_UNISTD_H 1
148 #define GPR_SUPPORT_CHANNELS_FROM_FD 1
149 #elif defined(__linux__)
150 #define GPR_PLATFORM_STRING "linux"
151 #ifndef _BSD_SOURCE
152 #define _BSD_SOURCE
153 #endif
154 #ifndef _DEFAULT_SOURCE
155 #define _DEFAULT_SOURCE
156 #endif
157 #ifndef _GNU_SOURCE
158 #define _GNU_SOURCE
159 #endif
160 #include <features.h>
161 #define GPR_CPU_LINUX 1
162 #define GPR_GCC_ATOMIC 1
163 #define GPR_GCC_TLS 1
164 #define GPR_LINUX 1
165 #define GPR_LINUX_LOG
166 #define GPR_SUPPORT_CHANNELS_FROM_FD 1
167 #define GPR_LINUX_ENV 1
168 #define GPR_POSIX_TMPFILE 1
169 #define GPR_POSIX_STRING 1
170 #define GPR_POSIX_SUBPROCESS 1
171 #define GPR_POSIX_SYNC 1
172 #define GPR_POSIX_TIME 1
173 #define GPR_GETPID_IN_UNISTD_H 1
174 #ifdef _LP64
175 #define GPR_ARCH_64 1
176 #else /* _LP64 */
177 #define GPR_ARCH_32 1
178 #endif /* _LP64 */
179 #ifdef __GLIBC__
180 #define GPR_POSIX_CRASH_HANDLER 1
181 #define GPR_LINUX_PTHREAD_NAME 1
182 #include <linux/version.h>
183 #else /* musl libc */
184 #define GPR_MUSL_LIBC_COMPAT 1
185 #endif
186 #elif defined(__APPLE__)
187 #include <Availability.h>
188 #include <TargetConditionals.h>
189 #ifndef _BSD_SOURCE
190 #define _BSD_SOURCE
191 #endif
192 #if TARGET_OS_IPHONE
193 #define GPR_PLATFORM_STRING "ios"
194 #define GPR_CPU_IPHONE 1
195 #define GPR_PTHREAD_TLS 1
196 /* the c-ares resolver isnt safe to enable on iOS */
197 #define GRPC_ARES 0
198 #else /* TARGET_OS_IPHONE */
199 #define GPR_PLATFORM_STRING "osx"
200 #ifdef __MAC_OS_X_VERSION_MIN_REQUIRED
201 #if __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_7
202 #define GPR_CPU_IPHONE 1
203 #define GPR_PTHREAD_TLS 1
204 #else /* __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_7 */
205 #define GPR_CPU_POSIX 1
206 /* TODO(vjpai): there is a reported issue in bazel build for Mac where __thread
207  in a header is currently not working (bazelbuild/bazel#4341). Remove
208  the following conditional and use GPR_GCC_TLS when that is fixed */
209 #ifndef GRPC_BAZEL_BUILD
210 #define GPR_GCC_TLS 1
211 #else /* GRPC_BAZEL_BUILD */
212 #define GPR_PTHREAD_TLS 1
213 #endif /* GRPC_BAZEL_BUILD */
214 #define GPR_APPLE_PTHREAD_NAME 1
215 #endif
216 #else /* __MAC_OS_X_VERSION_MIN_REQUIRED */
217 #define GPR_CPU_POSIX 1
218 /* TODO(vjpai): Remove the following conditional and use only GPR_GCC_TLS
219  when bazelbuild/bazel#4341 is fixed */
220 #ifndef GRPC_BAZEL_BUILD
221 #define GPR_GCC_TLS 1
222 #else /* GRPC_BAZEL_BUILD */
223 #define GPR_PTHREAD_TLS 1
224 #endif /* GRPC_BAZEL_BUILD */
225 #endif
226 #define GPR_POSIX_CRASH_HANDLER 1
227 #endif
228 #define GPR_APPLE 1
229 #define GPR_GCC_ATOMIC 1
230 #define GPR_POSIX_LOG 1
231 #define GPR_POSIX_ENV 1
232 #define GPR_POSIX_TMPFILE 1
233 #define GPR_POSIX_STRING 1
234 #define GPR_POSIX_SUBPROCESS 1
235 #define GPR_POSIX_SYNC 1
236 #define GPR_POSIX_TIME 1
237 #define GPR_GETPID_IN_UNISTD_H 1
238 /* TODO(mxyan): Remove when CFStream becomes default */
239 #ifndef GRPC_CFSTREAM
240 #define GPR_SUPPORT_CHANNELS_FROM_FD 1
241 #endif
242 #ifdef _LP64
243 #define GPR_ARCH_64 1
244 #else /* _LP64 */
245 #define GPR_ARCH_32 1
246 #endif /* _LP64 */
247 #elif defined(__FreeBSD__)
248 #define GPR_PLATFORM_STRING "freebsd"
249 #ifndef _BSD_SOURCE
250 #define _BSD_SOURCE
251 #endif
252 #define GPR_FREEBSD 1
253 #define GPR_CPU_POSIX 1
254 #define GPR_GCC_ATOMIC 1
255 #define GPR_GCC_TLS 1
256 #define GPR_POSIX_LOG 1
257 #define GPR_POSIX_ENV 1
258 #define GPR_POSIX_TMPFILE 1
259 #define GPR_POSIX_STRING 1
260 #define GPR_POSIX_SUBPROCESS 1
261 #define GPR_POSIX_SYNC 1
262 #define GPR_POSIX_TIME 1
263 #define GPR_GETPID_IN_UNISTD_H 1
264 #define GPR_SUPPORT_CHANNELS_FROM_FD 1
265 #ifdef _LP64
266 #define GPR_ARCH_64 1
267 #else /* _LP64 */
268 #define GPR_ARCH_32 1
269 #endif /* _LP64 */
270 #elif defined(__OpenBSD__)
271 #define GPR_PLATFORM_STRING "openbsd"
272 #ifndef _BSD_SOURCE
273 #define _BSD_SOURCE
274 #endif
275 #define GPR_OPENBSD 1
276 #define GPR_CPU_POSIX 1
277 #define GPR_GCC_ATOMIC 1
278 #define GPR_GCC_TLS 1
279 #define GPR_POSIX_LOG 1
280 #define GPR_POSIX_ENV 1
281 #define GPR_POSIX_TMPFILE 1
282 #define GPR_POSIX_STRING 1
283 #define GPR_POSIX_SUBPROCESS 1
284 #define GPR_POSIX_SYNC 1
285 #define GPR_POSIX_TIME 1
286 #define GPR_GETPID_IN_UNISTD_H 1
287 #define GPR_SUPPORT_CHANNELS_FROM_FD 1
288 #ifdef _LP64
289 #define GPR_ARCH_64 1
290 #else /* _LP64 */
291 #define GPR_ARCH_32 1
292 #endif /* _LP64 */
293 #elif defined(__sun) && defined(__SVR4)
294 #define GPR_PLATFORM_STRING "solaris"
295 #define GPR_SOLARIS 1
296 #define GPR_CPU_POSIX 1
297 #define GPR_GCC_ATOMIC 1
298 #define GPR_GCC_TLS 1
299 #define GPR_POSIX_LOG 1
300 #define GPR_POSIX_ENV 1
301 #define GPR_POSIX_TMPFILE 1
302 #define GPR_POSIX_STRING 1
303 #define GPR_POSIX_SUBPROCESS 1
304 #define GPR_POSIX_SYNC 1
305 #define GPR_POSIX_TIME 1
306 #define GPR_GETPID_IN_UNISTD_H 1
307 #ifdef _LP64
308 #define GPR_ARCH_64 1
309 #else /* _LP64 */
310 #define GPR_ARCH_32 1
311 #endif /* _LP64 */
312 #elif defined(_AIX)
313 #define GPR_PLATFORM_STRING "aix"
314 #ifndef _ALL_SOURCE
315 #define _ALL_SOURCE
316 #endif
317 #define GPR_AIX 1
318 #define GPR_CPU_POSIX 1
319 #define GPR_GCC_ATOMIC 1
320 #define GPR_GCC_TLS 1
321 #define GPR_POSIX_LOG 1
322 #define GPR_POSIX_ENV 1
323 #define GPR_POSIX_TMPFILE 1
324 #define GPR_POSIX_STRING 1
325 #define GPR_POSIX_SUBPROCESS 1
326 #define GPR_POSIX_SYNC 1
327 #define GPR_POSIX_TIME 1
328 #define GPR_GETPID_IN_UNISTD_H 1
329 #ifdef _LP64
330 #define GPR_ARCH_64 1
331 #else /* _LP64 */
332 #define GPR_ARCH_32 1
333 #endif /* _LP64 */
334 #elif defined(__native_client__)
335 #define GPR_PLATFORM_STRING "nacl"
336 #ifndef _BSD_SOURCE
337 #define _BSD_SOURCE
338 #endif
339 #ifndef _DEFAULT_SOURCE
340 #define _DEFAULT_SOURCE
341 #endif
342 #ifndef _GNU_SOURCE
343 #define _GNU_SOURCE
344 #endif
345 #define GPR_NACL 1
346 #define GPR_CPU_POSIX 1
347 #define GPR_GCC_ATOMIC 1
348 #define GPR_GCC_TLS 1
349 #define GPR_POSIX_LOG 1
350 #define GPR_POSIX_ENV 1
351 #define GPR_POSIX_TMPFILE 1
352 #define GPR_POSIX_STRING 1
353 #define GPR_POSIX_SUBPROCESS 1
354 #define GPR_POSIX_SYNC 1
355 #define GPR_POSIX_TIME 1
356 #define GPR_GETPID_IN_UNISTD_H 1
357 #ifdef _LP64
358 #define GPR_ARCH_64 1
359 #else /* _LP64 */
360 #define GPR_ARCH_32 1
361 #endif /* _LP64 */
362 #else
363 #error "Could not auto-detect platform"
364 #endif
365 #endif /* GPR_NO_AUTODETECT_PLATFORM */
366 
367 /*
368  * There are platforms for which TLS should not be used even though the
369  * compiler makes it seem like it's supported (Android NDK < r12b for example).
370  * This is primarily because of linker problems and toolchain misconfiguration:
371  * TLS isn't supported until NDK r12b per
372  * https://developer.android.com/ndk/downloads/revision_history.html
373  * TLS also does not work with Android NDK if GCC is being used as the compiler
374  * instead of Clang.
375  * Since NDK r16, `__NDK_MAJOR__` and `__NDK_MINOR__` are defined in
376  * <android/ndk-version.h>. For NDK < r16, users should define these macros,
377  * e.g. `-D__NDK_MAJOR__=11 -D__NKD_MINOR__=0` for NDK r11. */
378 #if defined(__ANDROID__) && defined(GPR_GCC_TLS)
379 #if __has_include(<android/ndk-version.h>)
380 #include <android/ndk-version.h>
381 #endif /* __has_include(<android/ndk-version.h>) */
382 #if (defined(__clang__) && defined(__NDK_MAJOR__) && defined(__NDK_MINOR__) && \
383  ((__NDK_MAJOR__ < 12) || \
384  ((__NDK_MAJOR__ == 12) && (__NDK_MINOR__ < 1)))) || \
385  (defined(__GNUC__) && !defined(__clang__))
386 #undef GPR_GCC_TLS
387 #define GPR_PTHREAD_TLS 1
388 #endif
389 #endif /*defined(__ANDROID__) && defined(GPR_GCC_TLS) */
390 
391 #if defined(__has_include)
392 #if __has_include(<atomic>)
393 #define GRPC_HAS_CXX11_ATOMIC
394 #endif /* __has_include(<atomic>) */
395 #endif /* defined(__has_include) */
396 
397 #ifndef GPR_PLATFORM_STRING
398 #warning "GPR_PLATFORM_STRING not auto-detected"
399 #define GPR_PLATFORM_STRING "unknown"
400 #endif
401 
402 #ifdef GPR_GCOV
403 #undef GPR_FORBID_UNREACHABLE_CODE
404 #define GPR_FORBID_UNREACHABLE_CODE 1
405 #endif
406 
407 #ifdef _MSC_VER
408 #if _MSC_VER < 1700
409 typedef __int8 int8_t;
410 typedef __int16 int16_t;
411 typedef __int32 int32_t;
412 typedef __int64 int64_t;
413 typedef unsigned __int8 uint8_t;
414 typedef unsigned __int16 uint16_t;
415 typedef unsigned __int32 uint32_t;
416 typedef unsigned __int64 uint64_t;
417 #else
418 #include <stdint.h>
419 #endif /* _MSC_VER < 1700 */
420 #else
421 #include <stdint.h>
422 #endif /* _MSC_VER */
423 
424 /* Cache line alignment */
425 #ifndef GPR_CACHELINE_SIZE_LOG
426 #if defined(__i386__) || defined(__x86_64__)
427 #define GPR_CACHELINE_SIZE_LOG 6
428 #endif
429 #ifndef GPR_CACHELINE_SIZE_LOG
430 /* A reasonable default guess. Note that overestimates tend to waste more
431  space, while underestimates tend to waste more time. */
432 #define GPR_CACHELINE_SIZE_LOG 6
433 #endif /* GPR_CACHELINE_SIZE_LOG */
434 #endif /* GPR_CACHELINE_SIZE_LOG */
435 
436 #define GPR_CACHELINE_SIZE (1 << GPR_CACHELINE_SIZE_LOG)
437 
438 /* scrub GCC_ATOMIC if it's not available on this compiler */
439 #if defined(GPR_GCC_ATOMIC) && !defined(__ATOMIC_RELAXED)
440 #undef GPR_GCC_ATOMIC
441 #define GPR_GCC_SYNC 1
442 #endif
443 
444 /* Validate platform combinations */
445 #if defined(GPR_GCC_ATOMIC) + defined(GPR_GCC_SYNC) + \
446  defined(GPR_WINDOWS_ATOMIC) != \
447  1
448 #error Must define exactly one of GPR_GCC_ATOMIC, GPR_GCC_SYNC, GPR_WINDOWS_ATOMIC
449 #endif
450 
451 #if defined(GPR_ARCH_32) + defined(GPR_ARCH_64) != 1
452 #error Must define exactly one of GPR_ARCH_32, GPR_ARCH_64
453 #endif
454 
455 #if defined(GPR_CPU_LINUX) + defined(GPR_CPU_POSIX) + defined(GPR_WINDOWS) + \
456  defined(GPR_CPU_IPHONE) + defined(GPR_CPU_CUSTOM) != \
457  1
458 #error Must define exactly one of GPR_CPU_LINUX, GPR_CPU_POSIX, GPR_WINDOWS, GPR_CPU_IPHONE, GPR_CPU_CUSTOM
459 #endif
460 
461 #if defined(GPR_MSVC_TLS) + defined(GPR_GCC_TLS) + defined(GPR_PTHREAD_TLS) + \
462  defined(GPR_CUSTOM_TLS) != \
463  1
464 #error Must define exactly one of GPR_MSVC_TLS, GPR_GCC_TLS, GPR_PTHREAD_TLS, GPR_CUSTOM_TLS
465 #endif
466 
467 /* maximum alignment needed for any type on this platform, rounded up to a
468  power of two */
469 #define GPR_MAX_ALIGNMENT 16
470 
471 #ifndef GRPC_ARES
472 #define GRPC_ARES 1
473 #endif
474 
475 #ifndef GRPC_IF_NAMETOINDEX
476 #define GRPC_IF_NAMETOINDEX 1
477 #endif
478 
479 #ifndef GRPC_MUST_USE_RESULT
480 #if defined(__GNUC__) && !defined(__MINGW32__)
481 #define GRPC_MUST_USE_RESULT __attribute__((warn_unused_result))
482 #define GPR_ALIGN_STRUCT(n) __attribute__((aligned(n)))
483 #else
484 #define GRPC_MUST_USE_RESULT
485 #define GPR_ALIGN_STRUCT(n)
486 #endif
487 #endif
488 
489 #ifndef GRPC_UNUSED
490 #if defined(__GNUC__) && !defined(__MINGW32__)
491 #define GRPC_UNUSED __attribute__((unused))
492 #else
493 #define GRPC_UNUSED
494 #endif
495 #endif
496 
497 #ifndef GPR_PRINT_FORMAT_CHECK
498 #ifdef __GNUC__
499 #define GPR_PRINT_FORMAT_CHECK(FORMAT_STR, ARGS) \
500  __attribute__((format(printf, FORMAT_STR, ARGS)))
501 #else
502 #define GPR_PRINT_FORMAT_CHECK(FORMAT_STR, ARGS)
503 #endif
504 #endif /* GPR_PRINT_FORMAT_CHECK */
505 
506 #if GPR_FORBID_UNREACHABLE_CODE
507 #define GPR_UNREACHABLE_CODE(STATEMENT)
508 #else
509 #define GPR_UNREACHABLE_CODE(STATEMENT) \
510  do { \
511  gpr_log(GPR_ERROR, "Should never reach here."); \
512  abort(); \
513  STATEMENT; \
514  } while (0)
515 #endif /* GPR_FORBID_UNREACHABLE_CODE */
516 
517 #ifndef GPRAPI
518 #define GPRAPI
519 #endif
520 
521 #ifndef GRPCAPI
522 #define GRPCAPI GPRAPI
523 #endif
524 
525 #ifndef CENSUSAPI
526 #define CENSUSAPI GRPCAPI
527 #endif
528 
529 #ifndef GPR_HAS_ATTRIBUTE
530 #ifdef __has_attribute
531 #define GPR_HAS_ATTRIBUTE(a) __has_attribute(a)
532 #else
533 #define GPR_HAS_ATTRIBUTE(a) 0
534 #endif
535 #endif /* GPR_HAS_ATTRIBUTE */
536 
537 #ifndef GPR_ATTRIBUTE_NOINLINE
538 #if GPR_HAS_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__))
539 #define GPR_ATTRIBUTE_NOINLINE __attribute__((noinline))
540 #define GPR_HAS_ATTRIBUTE_NOINLINE 1
541 #else
542 #define GPR_ATTRIBUTE_NOINLINE
543 #endif
544 #endif /* GPR_ATTRIBUTE_NOINLINE */
545 
546 #ifndef GPR_ATTRIBUTE_WEAK
547 /* Attribute weak is broken on LLVM/windows:
548  * https://bugs.llvm.org/show_bug.cgi?id=37598 */
549 #if (GPR_HAS_ATTRIBUTE(weak) || (defined(__GNUC__) && !defined(__clang__))) && \
550  !(defined(__llvm__) && defined(_WIN32))
551 #define GPR_ATTRIBUTE_WEAK __attribute__((weak))
552 #define GPR_HAS_ATTRIBUTE_WEAK 1
553 #else
554 #define GPR_ATTRIBUTE_WEAK
555 #endif
556 #endif /* GPR_ATTRIBUTE_WEAK */
557 
558 #ifndef GPR_ATTRIBUTE_NO_TSAN /* (1) */
559 #if defined(__has_feature)
560 #if __has_feature(thread_sanitizer)
561 #define GPR_ATTRIBUTE_NO_TSAN __attribute__((no_sanitize("thread")))
562 #endif /* __has_feature(thread_sanitizer) */
563 #endif /* defined(__has_feature) */
564 #ifndef GPR_ATTRIBUTE_NO_TSAN /* (2) */
565 #define GPR_ATTRIBUTE_NO_TSAN
566 #endif /* GPR_ATTRIBUTE_NO_TSAN (2) */
567 #endif /* GPR_ATTRIBUTE_NO_TSAN (1) */
568 
569 /* GRPC_TSAN_ENABLED will be defined, when compiled with thread sanitizer. */
570 #if defined(__SANITIZE_THREAD__)
571 #define GRPC_TSAN_ENABLED
572 #elif defined(__has_feature)
573 #if __has_feature(thread_sanitizer)
574 #define GRPC_TSAN_ENABLED
575 #endif
576 #endif
577 
578 /* GRPC_ALLOW_EXCEPTIONS should be 0 or 1 if exceptions are allowed or not */
579 #ifndef GRPC_ALLOW_EXCEPTIONS
580 /* If not already set, set to 1 on Windows (style guide standard) but to
581  * 0 on non-Windows platforms unless the compiler defines __EXCEPTIONS */
582 #ifdef GPR_WINDOWS
583 #define GRPC_ALLOW_EXCEPTIONS 1
584 #else /* GPR_WINDOWS */
585 #ifdef __EXCEPTIONS
586 #define GRPC_ALLOW_EXCEPTIONS 1
587 #else /* __EXCEPTIONS */
588 #define GRPC_ALLOW_EXCEPTIONS 0
589 #endif /* __EXCEPTIONS */
590 #endif /* __GPR_WINDOWS */
591 #endif /* GRPC_ALLOW_EXCEPTIONS */
592 
593 /* Use GPR_LIKELY only in cases where you are sure that a certain outcome is the
594  * most likely. Ideally, also collect performance numbers to justify the claim.
595  */
596 #ifdef __GNUC__
597 #define GPR_LIKELY(x) __builtin_expect((x), 1)
598 #define GPR_UNLIKELY(x) __builtin_expect((x), 0)
599 #else /* __GNUC__ */
600 #define GPR_LIKELY(x) (x)
601 #define GPR_UNLIKELY(x) (x)
602 #endif /* __GNUC__ */
603 
604 #ifndef __STDC_FORMAT_MACROS
605 #define __STDC_FORMAT_MACROS
606 #endif
607 
608 #endif /* GRPC_IMPL_CODEGEN_PORT_PLATFORM_H */
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