1 //===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines several macros, based on the current compiler. This allows 10 // use of compiler-specific features in a way that remains portable. This header 11 // can be included from either C or C++. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_SUPPORT_COMPILER_H 16 #define LLVM_SUPPORT_COMPILER_H 17 18 #include "llvm/Config/llvm-config.h" 19 20 #include <stddef.h> 21 22 #if defined(_MSC_VER) 23 #include <sal.h> 24 #endif 25 26 #ifndef __has_feature 27 # define __has_feature(x) 0 28 #endif 29 30 #ifndef __has_extension 31 # define __has_extension(x) 0 32 #endif 33 34 #ifndef __has_attribute 35 # define __has_attribute(x) 0 36 #endif 37 38 #ifndef __has_builtin 39 # define __has_builtin(x) 0 40 #endif 41 42 #ifndef __has_include 43 # define __has_include(x) 0 44 #endif 45 46 // Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in 47 // C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid. 48 #ifndef LLVM_HAS_CPP_ATTRIBUTE 49 #if defined(__cplusplus) && defined(__has_cpp_attribute) 50 # define LLVM_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) 51 #else 52 # define LLVM_HAS_CPP_ATTRIBUTE(x) 0 53 #endif 54 #endif 55 56 /// \macro LLVM_GNUC_PREREQ 57 /// Extend the default __GNUC_PREREQ even if glibc's features.h isn't 58 /// available. 59 #ifndef LLVM_GNUC_PREREQ 60 # if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) 61 # define LLVM_GNUC_PREREQ(maj, min, patch) \ 62 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \ 63 ((maj) << 20) + ((min) << 10) + (patch)) 64 # elif defined(__GNUC__) && defined(__GNUC_MINOR__) 65 # define LLVM_GNUC_PREREQ(maj, min, patch) \ 66 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10)) 67 # else 68 # define LLVM_GNUC_PREREQ(maj, min, patch) 0 69 # endif 70 #endif 71 72 /// \macro LLVM_MSC_PREREQ 73 /// Is the compiler MSVC of at least the specified version? 74 /// The common \param version values to check for are: 75 /// * 1910: VS2017, version 15.1 & 15.2 76 /// * 1911: VS2017, version 15.3 & 15.4 77 /// * 1912: VS2017, version 15.5 78 /// * 1913: VS2017, version 15.6 79 /// * 1914: VS2017, version 15.7 80 /// * 1915: VS2017, version 15.8 81 /// * 1916: VS2017, version 15.9 82 /// * 1920: VS2019, version 16.0 83 /// * 1921: VS2019, version 16.1 84 /// * 1922: VS2019, version 16.2 85 /// * 1923: VS2019, version 16.3 86 /// * 1924: VS2019, version 16.4 87 /// * 1925: VS2019, version 16.5 88 /// * 1926: VS2019, version 16.6 89 /// * 1927: VS2019, version 16.7 90 /// * 1928: VS2019, version 16.8 + 16.9 91 /// * 1929: VS2019, version 16.10 + 16.11 92 /// * 1930: VS2022, version 17.0 93 #ifdef _MSC_VER 94 #define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version)) 95 96 // We require at least VS 2019. 97 #if !defined(LLVM_FORCE_USE_OLD_TOOLCHAIN) 98 #if !LLVM_MSC_PREREQ(1920) 99 #error LLVM requires at least VS 2019. 100 #endif 101 #endif 102 103 #else 104 #define LLVM_MSC_PREREQ(version) 0 105 #endif 106 107 /// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked 108 /// into a shared library, then the class should be private to the library and 109 /// not accessible from outside it. Can also be used to mark variables and 110 /// functions, making them private to any shared library they are linked into. 111 /// On PE/COFF targets, library visibility is the default, so this isn't needed. 112 /// 113 /// LLVM_EXTERNAL_VISIBILITY - classes, functions, and variables marked with 114 /// this attribute will be made public and visible outside of any shared library 115 /// they are linked in to. 116 #if __has_attribute(visibility) && \ 117 (!(defined(_WIN32) || defined(__CYGWIN__)) || \ 118 (defined(__MINGW32__) && defined(__clang__))) 119 #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden"))) 120 #if defined(LLVM_BUILD_LLVM_DYLIB) || defined(LLVM_BUILD_SHARED_LIBS) 121 #define LLVM_EXTERNAL_VISIBILITY __attribute__((visibility("default"))) 122 #else 123 #define LLVM_EXTERNAL_VISIBILITY 124 #endif 125 #else 126 #define LLVM_LIBRARY_VISIBILITY 127 #define LLVM_EXTERNAL_VISIBILITY 128 #endif 129 130 #if defined(__GNUC__) 131 #define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality) 132 #else 133 #define LLVM_PREFETCH(addr, rw, locality) 134 #endif 135 136 #if __has_attribute(used) 137 #define LLVM_ATTRIBUTE_USED __attribute__((__used__)) 138 #else 139 #define LLVM_ATTRIBUTE_USED 140 #endif 141 142 #if defined(__clang__) 143 #define LLVM_DEPRECATED(MSG, FIX) __attribute__((deprecated(MSG, FIX))) 144 #else 145 #define LLVM_DEPRECATED(MSG, FIX) [[deprecated(MSG)]] 146 #endif 147 148 // Indicate that a non-static, non-const C++ member function reinitializes 149 // the entire object to a known state, independent of the previous state of 150 // the object. 151 // 152 // The clang-tidy check bugprone-use-after-move recognizes this attribute as a 153 // marker that a moved-from object has left the indeterminate state and can be 154 // reused. 155 #if LLVM_HAS_CPP_ATTRIBUTE(clang::reinitializes) 156 #define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]] 157 #else 158 #define LLVM_ATTRIBUTE_REINITIALIZES 159 #endif 160 161 // Some compilers warn about unused functions. When a function is sometimes 162 // used or not depending on build settings (e.g. a function only called from 163 // within "assert"), this attribute can be used to suppress such warnings. 164 // 165 // However, it shouldn't be used for unused *variables*, as those have a much 166 // more portable solution: 167 // (void)unused_var_name; 168 // Prefer cast-to-void wherever it is sufficient. 169 #if __has_attribute(unused) 170 #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__)) 171 #else 172 #define LLVM_ATTRIBUTE_UNUSED 173 #endif 174 175 // FIXME: Provide this for PE/COFF targets. 176 #if __has_attribute(weak) && !defined(__MINGW32__) && !defined(__CYGWIN__) && \ 177 !defined(_WIN32) 178 #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__)) 179 #else 180 #define LLVM_ATTRIBUTE_WEAK 181 #endif 182 183 // Prior to clang 3.2, clang did not accept any spelling of 184 // __has_attribute(const), so assume it is supported. 185 #if defined(__clang__) || defined(__GNUC__) 186 // aka 'CONST' but following LLVM Conventions. 187 #define LLVM_READNONE __attribute__((__const__)) 188 #else 189 #define LLVM_READNONE 190 #endif 191 192 #if __has_attribute(pure) || defined(__GNUC__) 193 // aka 'PURE' but following LLVM Conventions. 194 #define LLVM_READONLY __attribute__((__pure__)) 195 #else 196 #define LLVM_READONLY 197 #endif 198 199 #if __has_attribute(minsize) 200 #define LLVM_ATTRIBUTE_MINSIZE __attribute__((minsize)) 201 #else 202 #define LLVM_ATTRIBUTE_MINSIZE 203 #endif 204 205 #if __has_builtin(__builtin_expect) || defined(__GNUC__) 206 #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) 207 #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) 208 #else 209 #define LLVM_LIKELY(EXPR) (EXPR) 210 #define LLVM_UNLIKELY(EXPR) (EXPR) 211 #endif 212 213 /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, 214 /// mark a method "not for inlining". 215 #if __has_attribute(noinline) 216 #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline)) 217 #elif defined(_MSC_VER) 218 #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline) 219 #else 220 #define LLVM_ATTRIBUTE_NOINLINE 221 #endif 222 223 /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do 224 /// so, mark a method "always inline" because it is performance sensitive. 225 #if __has_attribute(always_inline) 226 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline)) 227 #elif defined(_MSC_VER) 228 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline 229 #else 230 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline 231 #endif 232 233 /// LLVM_ATTRIBUTE_NO_DEBUG - On compilers where we have a directive to do 234 /// so, mark a method "no debug" because debug info makes the debugger 235 /// experience worse. 236 #if __has_attribute(nodebug) 237 #define LLVM_ATTRIBUTE_NODEBUG __attribute__((nodebug)) 238 #else 239 #define LLVM_ATTRIBUTE_NODEBUG 240 #endif 241 242 #if __has_attribute(returns_nonnull) 243 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull)) 244 #elif defined(_MSC_VER) 245 #define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_ 246 #else 247 #define LLVM_ATTRIBUTE_RETURNS_NONNULL 248 #endif 249 250 /// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a 251 /// pointer that does not alias any other valid pointer. 252 #ifdef __GNUC__ 253 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__)) 254 #elif defined(_MSC_VER) 255 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict) 256 #else 257 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS 258 #endif 259 260 /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements. 261 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough) 262 #define LLVM_FALLTHROUGH [[fallthrough]] 263 #elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough) 264 #define LLVM_FALLTHROUGH [[gnu::fallthrough]] 265 #elif __has_attribute(fallthrough) 266 #define LLVM_FALLTHROUGH __attribute__((fallthrough)) 267 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::fallthrough) 268 #define LLVM_FALLTHROUGH [[clang::fallthrough]] 269 #else 270 #define LLVM_FALLTHROUGH 271 #endif 272 273 /// LLVM_REQUIRE_CONSTANT_INITIALIZATION - Apply this to globals to ensure that 274 /// they are constant initialized. 275 #if LLVM_HAS_CPP_ATTRIBUTE(clang::require_constant_initialization) 276 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION \ 277 [[clang::require_constant_initialization]] 278 #else 279 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION 280 #endif 281 282 /// LLVM_GSL_OWNER - Apply this to owning classes like SmallVector to enable 283 /// lifetime warnings. 284 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Owner) 285 #define LLVM_GSL_OWNER [[gsl::Owner]] 286 #else 287 #define LLVM_GSL_OWNER 288 #endif 289 290 /// LLVM_GSL_POINTER - Apply this to non-owning classes like 291 /// StringRef to enable lifetime warnings. 292 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Pointer) 293 #define LLVM_GSL_POINTER [[gsl::Pointer]] 294 #else 295 #define LLVM_GSL_POINTER 296 #endif 297 298 /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress 299 /// pedantic diagnostics. 300 #ifdef __GNUC__ 301 #define LLVM_EXTENSION __extension__ 302 #else 303 #define LLVM_EXTENSION 304 #endif 305 306 /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands 307 /// to an expression which states that it is undefined behavior for the 308 /// compiler to reach this point. Otherwise is not defined. 309 /// 310 /// '#else' is intentionally left out so that other macro logic (e.g., 311 /// LLVM_ASSUME_ALIGNED and llvm_unreachable()) can detect whether 312 /// LLVM_BUILTIN_UNREACHABLE has a definition. 313 #if __has_builtin(__builtin_unreachable) || defined(__GNUC__) 314 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() 315 #elif defined(_MSC_VER) 316 # define LLVM_BUILTIN_UNREACHABLE __assume(false) 317 #endif 318 319 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression 320 /// which causes the program to exit abnormally. 321 #if __has_builtin(__builtin_trap) || defined(__GNUC__) 322 # define LLVM_BUILTIN_TRAP __builtin_trap() 323 #elif defined(_MSC_VER) 324 // The __debugbreak intrinsic is supported by MSVC, does not require forward 325 // declarations involving platform-specific typedefs (unlike RaiseException), 326 // results in a call to vectored exception handlers, and encodes to a short 327 // instruction that still causes the trapping behavior we want. 328 # define LLVM_BUILTIN_TRAP __debugbreak() 329 #else 330 # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 331 #endif 332 333 /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to 334 /// an expression which causes the program to break while running 335 /// under a debugger. 336 #if __has_builtin(__builtin_debugtrap) 337 # define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap() 338 #elif defined(_MSC_VER) 339 // The __debugbreak intrinsic is supported by MSVC and breaks while 340 // running under the debugger, and also supports invoking a debugger 341 // when the OS is configured appropriately. 342 # define LLVM_BUILTIN_DEBUGTRAP __debugbreak() 343 #else 344 // Just continue execution when built with compilers that have no 345 // support. This is a debugging aid and not intended to force the 346 // program to abort if encountered. 347 # define LLVM_BUILTIN_DEBUGTRAP 348 #endif 349 350 /// \macro LLVM_ASSUME_ALIGNED 351 /// Returns a pointer with an assumed alignment. 352 #if __has_builtin(__builtin_assume_aligned) || defined(__GNUC__) 353 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a) 354 #elif defined(LLVM_BUILTIN_UNREACHABLE) 355 # define LLVM_ASSUME_ALIGNED(p, a) \ 356 (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p))) 357 #else 358 # define LLVM_ASSUME_ALIGNED(p, a) (p) 359 #endif 360 361 /// \macro LLVM_PACKED 362 /// Used to specify a packed structure. 363 /// LLVM_PACKED( 364 /// struct A { 365 /// int i; 366 /// int j; 367 /// int k; 368 /// long long l; 369 /// }); 370 /// 371 /// LLVM_PACKED_START 372 /// struct B { 373 /// int i; 374 /// int j; 375 /// int k; 376 /// long long l; 377 /// }; 378 /// LLVM_PACKED_END 379 #ifdef _MSC_VER 380 # define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop)) 381 # define LLVM_PACKED_START __pragma(pack(push, 1)) 382 # define LLVM_PACKED_END __pragma(pack(pop)) 383 #else 384 # define LLVM_PACKED(d) d __attribute__((packed)) 385 # define LLVM_PACKED_START _Pragma("pack(push, 1)") 386 # define LLVM_PACKED_END _Pragma("pack(pop)") 387 #endif 388 389 /// \macro LLVM_MEMORY_SANITIZER_BUILD 390 /// Whether LLVM itself is built with MemorySanitizer instrumentation. 391 #if __has_feature(memory_sanitizer) 392 # define LLVM_MEMORY_SANITIZER_BUILD 1 393 # include <sanitizer/msan_interface.h> 394 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory)) 395 #else 396 # define LLVM_MEMORY_SANITIZER_BUILD 0 397 # define __msan_allocated_memory(p, size) 398 # define __msan_unpoison(p, size) 399 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE 400 #endif 401 402 /// \macro LLVM_ADDRESS_SANITIZER_BUILD 403 /// Whether LLVM itself is built with AddressSanitizer instrumentation. 404 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__) 405 # define LLVM_ADDRESS_SANITIZER_BUILD 1 406 #if __has_include(<sanitizer/asan_interface.h>) 407 # include <sanitizer/asan_interface.h> 408 #else 409 // These declarations exist to support ASan with MSVC. If MSVC eventually ships 410 // asan_interface.h in their headers, then we can remove this. 411 #ifdef __cplusplus 412 extern "C" { 413 #endif 414 void __asan_poison_memory_region(void const volatile *addr, size_t size); 415 void __asan_unpoison_memory_region(void const volatile *addr, size_t size); 416 #ifdef __cplusplus 417 } // extern "C" 418 #endif 419 #endif 420 #else 421 # define LLVM_ADDRESS_SANITIZER_BUILD 0 422 # define __asan_poison_memory_region(p, size) 423 # define __asan_unpoison_memory_region(p, size) 424 #endif 425 426 /// \macro LLVM_HWADDRESS_SANITIZER_BUILD 427 /// Whether LLVM itself is built with HWAddressSanitizer instrumentation. 428 #if __has_feature(hwaddress_sanitizer) 429 #define LLVM_HWADDRESS_SANITIZER_BUILD 1 430 #else 431 #define LLVM_HWADDRESS_SANITIZER_BUILD 0 432 #endif 433 434 /// \macro LLVM_THREAD_SANITIZER_BUILD 435 /// Whether LLVM itself is built with ThreadSanitizer instrumentation. 436 #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__) 437 # define LLVM_THREAD_SANITIZER_BUILD 1 438 #else 439 # define LLVM_THREAD_SANITIZER_BUILD 0 440 #endif 441 442 #if LLVM_THREAD_SANITIZER_BUILD 443 // Thread Sanitizer is a tool that finds races in code. 444 // See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations . 445 // tsan detects these exact functions by name. 446 #ifdef __cplusplus 447 extern "C" { 448 #endif 449 void AnnotateHappensAfter(const char *file, int line, const volatile void *cv); 450 void AnnotateHappensBefore(const char *file, int line, const volatile void *cv); 451 void AnnotateIgnoreWritesBegin(const char *file, int line); 452 void AnnotateIgnoreWritesEnd(const char *file, int line); 453 #ifdef __cplusplus 454 } 455 #endif 456 457 // This marker is used to define a happens-before arc. The race detector will 458 // infer an arc from the begin to the end when they share the same pointer 459 // argument. 460 # define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv) 461 462 // This marker defines the destination of a happens-before arc. 463 # define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv) 464 465 // Ignore any races on writes between here and the next TsanIgnoreWritesEnd. 466 # define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__) 467 468 // Resume checking for racy writes. 469 # define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__) 470 #else 471 # define TsanHappensBefore(cv) 472 # define TsanHappensAfter(cv) 473 # define TsanIgnoreWritesBegin() 474 # define TsanIgnoreWritesEnd() 475 #endif 476 477 /// \macro LLVM_NO_SANITIZE 478 /// Disable a particular sanitizer for a function. 479 #if __has_attribute(no_sanitize) 480 #define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND))) 481 #else 482 #define LLVM_NO_SANITIZE(KIND) 483 #endif 484 485 /// Mark debug helper function definitions like dump() that should not be 486 /// stripped from debug builds. 487 /// Note that you should also surround dump() functions with 488 /// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always 489 /// get stripped in release builds. 490 // FIXME: Move this to a private config.h as it's not usable in public headers. 491 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 492 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED 493 #else 494 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE 495 #endif 496 497 /// \macro LLVM_PRETTY_FUNCTION 498 /// Gets a user-friendly looking function signature for the current scope 499 /// using the best available method on each platform. The exact format of the 500 /// resulting string is implementation specific and non-portable, so this should 501 /// only be used, for example, for logging or diagnostics. 502 #if defined(_MSC_VER) 503 #define LLVM_PRETTY_FUNCTION __FUNCSIG__ 504 #elif defined(__GNUC__) || defined(__clang__) 505 #define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__ 506 #else 507 #define LLVM_PRETTY_FUNCTION __func__ 508 #endif 509 510 /// \macro LLVM_THREAD_LOCAL 511 /// A thread-local storage specifier which can be used with globals, 512 /// extern globals, and static globals. 513 /// 514 /// This is essentially an extremely restricted analog to C++11's thread_local 515 /// support. It uses thread_local if available, falling back on gcc __thread 516 /// if not. __thread doesn't support many of the C++11 thread_local's 517 /// features. You should only use this for PODs that you can statically 518 /// initialize to some constant value. In almost all circumstances this is most 519 /// appropriate for use with a pointer, integer, or small aggregation of 520 /// pointers and integers. 521 #if LLVM_ENABLE_THREADS 522 #if __has_feature(cxx_thread_local) || defined(_MSC_VER) 523 #define LLVM_THREAD_LOCAL thread_local 524 #else 525 // Clang, GCC, and other compatible compilers used __thread prior to C++11 and 526 // we only need the restricted functionality that provides. 527 #define LLVM_THREAD_LOCAL __thread 528 #endif 529 #else // !LLVM_ENABLE_THREADS 530 // If threading is disabled entirely, this compiles to nothing and you get 531 // a normal global variable. 532 #define LLVM_THREAD_LOCAL 533 #endif 534 535 /// \macro LLVM_ENABLE_EXCEPTIONS 536 /// Whether LLVM is built with exception support. 537 #if __has_feature(cxx_exceptions) 538 #define LLVM_ENABLE_EXCEPTIONS 1 539 #elif defined(__GNUC__) && defined(__EXCEPTIONS) 540 #define LLVM_ENABLE_EXCEPTIONS 1 541 #elif defined(_MSC_VER) && defined(_CPPUNWIND) 542 #define LLVM_ENABLE_EXCEPTIONS 1 543 #endif 544 545 /// \macro LLVM_NO_PROFILE_INSTRUMENT_FUNCTION 546 /// Disable the profile instrument for a function. 547 #if __has_attribute(no_profile_instrument_function) 548 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION \ 549 __attribute__((no_profile_instrument_function)) 550 #else 551 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION 552 #endif 553 554 #endif 555