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) && !defined(__MINGW32__) && \ 117 !defined(__CYGWIN__) && !defined(_WIN32) 118 #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden"))) 119 #if defined(LLVM_BUILD_LLVM_DYLIB) || defined(LLVM_BUILD_SHARED_LIBS) 120 #define LLVM_EXTERNAL_VISIBILITY __attribute__((visibility("default"))) 121 #else 122 #define LLVM_EXTERNAL_VISIBILITY 123 #endif 124 #else 125 #define LLVM_LIBRARY_VISIBILITY 126 #define LLVM_EXTERNAL_VISIBILITY 127 #endif 128 129 #if defined(__GNUC__) 130 #define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality) 131 #else 132 #define LLVM_PREFETCH(addr, rw, locality) 133 #endif 134 135 #if __has_attribute(used) 136 #define LLVM_ATTRIBUTE_USED __attribute__((__used__)) 137 #else 138 #define LLVM_ATTRIBUTE_USED 139 #endif 140 141 /// LLVM_NODISCARD - Warn if a type or return value is discarded. 142 143 // Use the 'nodiscard' attribute in C++17 or newer mode. 144 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(nodiscard) 145 #define LLVM_NODISCARD [[nodiscard]] 146 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::warn_unused_result) 147 #define LLVM_NODISCARD [[clang::warn_unused_result]] 148 // Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also 149 // warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518). 150 // Use the 'nodiscard' attribute in C++14 mode only with GCC. 151 // TODO: remove this workaround when PR33518 is resolved. 152 #elif defined(__GNUC__) && LLVM_HAS_CPP_ATTRIBUTE(nodiscard) 153 #define LLVM_NODISCARD [[nodiscard]] 154 #else 155 #define LLVM_NODISCARD 156 #endif 157 158 // Indicate that a non-static, non-const C++ member function reinitializes 159 // the entire object to a known state, independent of the previous state of 160 // the object. 161 // 162 // The clang-tidy check bugprone-use-after-move recognizes this attribute as a 163 // marker that a moved-from object has left the indeterminate state and can be 164 // reused. 165 #if LLVM_HAS_CPP_ATTRIBUTE(clang::reinitializes) 166 #define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]] 167 #else 168 #define LLVM_ATTRIBUTE_REINITIALIZES 169 #endif 170 171 // Some compilers warn about unused functions. When a function is sometimes 172 // used or not depending on build settings (e.g. a function only called from 173 // within "assert"), this attribute can be used to suppress such warnings. 174 // 175 // However, it shouldn't be used for unused *variables*, as those have a much 176 // more portable solution: 177 // (void)unused_var_name; 178 // Prefer cast-to-void wherever it is sufficient. 179 #if __has_attribute(unused) 180 #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__)) 181 #else 182 #define LLVM_ATTRIBUTE_UNUSED 183 #endif 184 185 // FIXME: Provide this for PE/COFF targets. 186 #if __has_attribute(weak) && !defined(__MINGW32__) && !defined(__CYGWIN__) && \ 187 !defined(_WIN32) 188 #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__)) 189 #else 190 #define LLVM_ATTRIBUTE_WEAK 191 #endif 192 193 // Prior to clang 3.2, clang did not accept any spelling of 194 // __has_attribute(const), so assume it is supported. 195 #if defined(__clang__) || defined(__GNUC__) 196 // aka 'CONST' but following LLVM Conventions. 197 #define LLVM_READNONE __attribute__((__const__)) 198 #else 199 #define LLVM_READNONE 200 #endif 201 202 #if __has_attribute(pure) || defined(__GNUC__) 203 // aka 'PURE' but following LLVM Conventions. 204 #define LLVM_READONLY __attribute__((__pure__)) 205 #else 206 #define LLVM_READONLY 207 #endif 208 209 #if __has_attribute(minsize) 210 #define LLVM_ATTRIBUTE_MINSIZE __attribute__((minsize)) 211 #else 212 #define LLVM_ATTRIBUTE_MINSIZE 213 #endif 214 215 #if __has_builtin(__builtin_expect) || defined(__GNUC__) 216 #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) 217 #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) 218 #else 219 #define LLVM_LIKELY(EXPR) (EXPR) 220 #define LLVM_UNLIKELY(EXPR) (EXPR) 221 #endif 222 223 /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, 224 /// mark a method "not for inlining". 225 #if __has_attribute(noinline) 226 #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline)) 227 #elif defined(_MSC_VER) 228 #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline) 229 #else 230 #define LLVM_ATTRIBUTE_NOINLINE 231 #endif 232 233 /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do 234 /// so, mark a method "always inline" because it is performance sensitive. 235 #if __has_attribute(always_inline) 236 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline)) 237 #elif defined(_MSC_VER) 238 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline 239 #else 240 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline 241 #endif 242 243 /// LLVM_ATTRIBUTE_NO_DEBUG - On compilers where we have a directive to do 244 /// so, mark a method "no debug" because debug info makes the debugger 245 /// experience worse. 246 #if __has_attribute(nodebug) 247 #define LLVM_ATTRIBUTE_NODEBUG __attribute__((nodebug)) 248 #else 249 #define LLVM_ATTRIBUTE_NODEBUG 250 #endif 251 252 #if __has_attribute(returns_nonnull) 253 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull)) 254 #elif defined(_MSC_VER) 255 #define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_ 256 #else 257 #define LLVM_ATTRIBUTE_RETURNS_NONNULL 258 #endif 259 260 /// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a 261 /// pointer that does not alias any other valid pointer. 262 #ifdef __GNUC__ 263 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__)) 264 #elif defined(_MSC_VER) 265 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict) 266 #else 267 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS 268 #endif 269 270 /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements. 271 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough) 272 #define LLVM_FALLTHROUGH [[fallthrough]] 273 #elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough) 274 #define LLVM_FALLTHROUGH [[gnu::fallthrough]] 275 #elif __has_attribute(fallthrough) 276 #define LLVM_FALLTHROUGH __attribute__((fallthrough)) 277 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::fallthrough) 278 #define LLVM_FALLTHROUGH [[clang::fallthrough]] 279 #else 280 #define LLVM_FALLTHROUGH 281 #endif 282 283 /// LLVM_REQUIRE_CONSTANT_INITIALIZATION - Apply this to globals to ensure that 284 /// they are constant initialized. 285 #if LLVM_HAS_CPP_ATTRIBUTE(clang::require_constant_initialization) 286 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION \ 287 [[clang::require_constant_initialization]] 288 #else 289 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION 290 #endif 291 292 /// LLVM_GSL_OWNER - Apply this to owning classes like SmallVector to enable 293 /// lifetime warnings. 294 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Owner) 295 #define LLVM_GSL_OWNER [[gsl::Owner]] 296 #else 297 #define LLVM_GSL_OWNER 298 #endif 299 300 /// LLVM_GSL_POINTER - Apply this to non-owning classes like 301 /// StringRef to enable lifetime warnings. 302 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Pointer) 303 #define LLVM_GSL_POINTER [[gsl::Pointer]] 304 #else 305 #define LLVM_GSL_POINTER 306 #endif 307 308 /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress 309 /// pedantic diagnostics. 310 #ifdef __GNUC__ 311 #define LLVM_EXTENSION __extension__ 312 #else 313 #define LLVM_EXTENSION 314 #endif 315 316 /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands 317 /// to an expression which states that it is undefined behavior for the 318 /// compiler to reach this point. Otherwise is not defined. 319 /// 320 /// '#else' is intentionally left out so that other macro logic (e.g., 321 /// LLVM_ASSUME_ALIGNED and llvm_unreachable()) can detect whether 322 /// LLVM_BUILTIN_UNREACHABLE has a definition. 323 #if __has_builtin(__builtin_unreachable) || defined(__GNUC__) 324 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() 325 #elif defined(_MSC_VER) 326 # define LLVM_BUILTIN_UNREACHABLE __assume(false) 327 #endif 328 329 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression 330 /// which causes the program to exit abnormally. 331 #if __has_builtin(__builtin_trap) || defined(__GNUC__) 332 # define LLVM_BUILTIN_TRAP __builtin_trap() 333 #elif defined(_MSC_VER) 334 // The __debugbreak intrinsic is supported by MSVC, does not require forward 335 // declarations involving platform-specific typedefs (unlike RaiseException), 336 // results in a call to vectored exception handlers, and encodes to a short 337 // instruction that still causes the trapping behavior we want. 338 # define LLVM_BUILTIN_TRAP __debugbreak() 339 #else 340 # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 341 #endif 342 343 /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to 344 /// an expression which causes the program to break while running 345 /// under a debugger. 346 #if __has_builtin(__builtin_debugtrap) 347 # define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap() 348 #elif defined(_MSC_VER) 349 // The __debugbreak intrinsic is supported by MSVC and breaks while 350 // running under the debugger, and also supports invoking a debugger 351 // when the OS is configured appropriately. 352 # define LLVM_BUILTIN_DEBUGTRAP __debugbreak() 353 #else 354 // Just continue execution when built with compilers that have no 355 // support. This is a debugging aid and not intended to force the 356 // program to abort if encountered. 357 # define LLVM_BUILTIN_DEBUGTRAP 358 #endif 359 360 /// \macro LLVM_ASSUME_ALIGNED 361 /// Returns a pointer with an assumed alignment. 362 #if __has_builtin(__builtin_assume_aligned) || defined(__GNUC__) 363 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a) 364 #elif defined(LLVM_BUILTIN_UNREACHABLE) 365 # define LLVM_ASSUME_ALIGNED(p, a) \ 366 (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p))) 367 #else 368 # define LLVM_ASSUME_ALIGNED(p, a) (p) 369 #endif 370 371 /// \macro LLVM_PACKED 372 /// Used to specify a packed structure. 373 /// LLVM_PACKED( 374 /// struct A { 375 /// int i; 376 /// int j; 377 /// int k; 378 /// long long l; 379 /// }); 380 /// 381 /// LLVM_PACKED_START 382 /// struct B { 383 /// int i; 384 /// int j; 385 /// int k; 386 /// long long l; 387 /// }; 388 /// LLVM_PACKED_END 389 #ifdef _MSC_VER 390 # define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop)) 391 # define LLVM_PACKED_START __pragma(pack(push, 1)) 392 # define LLVM_PACKED_END __pragma(pack(pop)) 393 #else 394 # define LLVM_PACKED(d) d __attribute__((packed)) 395 # define LLVM_PACKED_START _Pragma("pack(push, 1)") 396 # define LLVM_PACKED_END _Pragma("pack(pop)") 397 #endif 398 399 /// \macro LLVM_MEMORY_SANITIZER_BUILD 400 /// Whether LLVM itself is built with MemorySanitizer instrumentation. 401 #if __has_feature(memory_sanitizer) 402 # define LLVM_MEMORY_SANITIZER_BUILD 1 403 # include <sanitizer/msan_interface.h> 404 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory)) 405 #else 406 # define LLVM_MEMORY_SANITIZER_BUILD 0 407 # define __msan_allocated_memory(p, size) 408 # define __msan_unpoison(p, size) 409 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE 410 #endif 411 412 /// \macro LLVM_ADDRESS_SANITIZER_BUILD 413 /// Whether LLVM itself is built with AddressSanitizer instrumentation. 414 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__) 415 # define LLVM_ADDRESS_SANITIZER_BUILD 1 416 #if __has_include(<sanitizer/asan_interface.h>) 417 # include <sanitizer/asan_interface.h> 418 #else 419 // These declarations exist to support ASan with MSVC. If MSVC eventually ships 420 // asan_interface.h in their headers, then we can remove this. 421 #ifdef __cplusplus 422 extern "C" { 423 #endif 424 void __asan_poison_memory_region(void const volatile *addr, size_t size); 425 void __asan_unpoison_memory_region(void const volatile *addr, size_t size); 426 #ifdef __cplusplus 427 } // extern "C" 428 #endif 429 #endif 430 #else 431 # define LLVM_ADDRESS_SANITIZER_BUILD 0 432 # define __asan_poison_memory_region(p, size) 433 # define __asan_unpoison_memory_region(p, size) 434 #endif 435 436 /// \macro LLVM_THREAD_SANITIZER_BUILD 437 /// Whether LLVM itself is built with ThreadSanitizer instrumentation. 438 #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__) 439 # define LLVM_THREAD_SANITIZER_BUILD 1 440 #else 441 # define LLVM_THREAD_SANITIZER_BUILD 0 442 #endif 443 444 #if LLVM_THREAD_SANITIZER_BUILD 445 // Thread Sanitizer is a tool that finds races in code. 446 // See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations . 447 // tsan detects these exact functions by name. 448 #ifdef __cplusplus 449 extern "C" { 450 #endif 451 void AnnotateHappensAfter(const char *file, int line, const volatile void *cv); 452 void AnnotateHappensBefore(const char *file, int line, const volatile void *cv); 453 void AnnotateIgnoreWritesBegin(const char *file, int line); 454 void AnnotateIgnoreWritesEnd(const char *file, int line); 455 #ifdef __cplusplus 456 } 457 #endif 458 459 // This marker is used to define a happens-before arc. The race detector will 460 // infer an arc from the begin to the end when they share the same pointer 461 // argument. 462 # define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv) 463 464 // This marker defines the destination of a happens-before arc. 465 # define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv) 466 467 // Ignore any races on writes between here and the next TsanIgnoreWritesEnd. 468 # define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__) 469 470 // Resume checking for racy writes. 471 # define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__) 472 #else 473 # define TsanHappensBefore(cv) 474 # define TsanHappensAfter(cv) 475 # define TsanIgnoreWritesBegin() 476 # define TsanIgnoreWritesEnd() 477 #endif 478 479 /// \macro LLVM_NO_SANITIZE 480 /// Disable a particular sanitizer for a function. 481 #if __has_attribute(no_sanitize) 482 #define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND))) 483 #else 484 #define LLVM_NO_SANITIZE(KIND) 485 #endif 486 487 /// Mark debug helper function definitions like dump() that should not be 488 /// stripped from debug builds. 489 /// Note that you should also surround dump() functions with 490 /// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always 491 /// get stripped in release builds. 492 // FIXME: Move this to a private config.h as it's not usable in public headers. 493 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 494 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED 495 #else 496 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE 497 #endif 498 499 /// \macro LLVM_PRETTY_FUNCTION 500 /// Gets a user-friendly looking function signature for the current scope 501 /// using the best available method on each platform. The exact format of the 502 /// resulting string is implementation specific and non-portable, so this should 503 /// only be used, for example, for logging or diagnostics. 504 #if defined(_MSC_VER) 505 #define LLVM_PRETTY_FUNCTION __FUNCSIG__ 506 #elif defined(__GNUC__) || defined(__clang__) 507 #define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__ 508 #else 509 #define LLVM_PRETTY_FUNCTION __func__ 510 #endif 511 512 /// \macro LLVM_THREAD_LOCAL 513 /// A thread-local storage specifier which can be used with globals, 514 /// extern globals, and static globals. 515 /// 516 /// This is essentially an extremely restricted analog to C++11's thread_local 517 /// support. It uses thread_local if available, falling back on gcc __thread 518 /// if not. __thread doesn't support many of the C++11 thread_local's 519 /// features. You should only use this for PODs that you can statically 520 /// initialize to some constant value. In almost all circumstances this is most 521 /// appropriate for use with a pointer, integer, or small aggregation of 522 /// pointers and integers. 523 #if LLVM_ENABLE_THREADS 524 #if __has_feature(cxx_thread_local) || defined(_MSC_VER) 525 #define LLVM_THREAD_LOCAL thread_local 526 #else 527 // Clang, GCC, and other compatible compilers used __thread prior to C++11 and 528 // we only need the restricted functionality that provides. 529 #define LLVM_THREAD_LOCAL __thread 530 #endif 531 #else // !LLVM_ENABLE_THREADS 532 // If threading is disabled entirely, this compiles to nothing and you get 533 // a normal global variable. 534 #define LLVM_THREAD_LOCAL 535 #endif 536 537 /// \macro LLVM_ENABLE_EXCEPTIONS 538 /// Whether LLVM is built with exception support. 539 #if __has_feature(cxx_exceptions) 540 #define LLVM_ENABLE_EXCEPTIONS 1 541 #elif defined(__GNUC__) && defined(__EXCEPTIONS) 542 #define LLVM_ENABLE_EXCEPTIONS 1 543 #elif defined(_MSC_VER) && defined(_CPPUNWIND) 544 #define LLVM_ENABLE_EXCEPTIONS 1 545 #endif 546 547 /// \macro LLVM_NO_PROFILE_INSTRUMENT_FUNCTION 548 /// Disable the profile instrument for a function. 549 #if __has_attribute(no_profile_instrument_function) 550 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION \ 551 __attribute__((no_profile_instrument_function)) 552 #else 553 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION 554 #endif 555 556 #endif 557