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 #ifdef __cplusplus 21 #include <new> 22 #endif 23 #include <stddef.h> 24 25 #if defined(_MSC_VER) 26 #include <sal.h> 27 #endif 28 29 #ifndef __has_feature 30 # define __has_feature(x) 0 31 #endif 32 33 #ifndef __has_extension 34 # define __has_extension(x) 0 35 #endif 36 37 #ifndef __has_attribute 38 # define __has_attribute(x) 0 39 #endif 40 41 #ifndef __has_builtin 42 # define __has_builtin(x) 0 43 #endif 44 45 // Only use __has_cpp_attribute in C++ mode. GCC defines __has_cpp_attribute in 46 // C mode, but the :: in __has_cpp_attribute(scoped::attribute) is invalid. 47 #ifndef LLVM_HAS_CPP_ATTRIBUTE 48 #if defined(__cplusplus) && defined(__has_cpp_attribute) 49 # define LLVM_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x) 50 #else 51 # define LLVM_HAS_CPP_ATTRIBUTE(x) 0 52 #endif 53 #endif 54 55 /// \macro LLVM_GNUC_PREREQ 56 /// Extend the default __GNUC_PREREQ even if glibc's features.h isn't 57 /// available. 58 #ifndef LLVM_GNUC_PREREQ 59 # if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__) 60 # define LLVM_GNUC_PREREQ(maj, min, patch) \ 61 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \ 62 ((maj) << 20) + ((min) << 10) + (patch)) 63 # elif defined(__GNUC__) && defined(__GNUC_MINOR__) 64 # define LLVM_GNUC_PREREQ(maj, min, patch) \ 65 ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10)) 66 # else 67 # define LLVM_GNUC_PREREQ(maj, min, patch) 0 68 # endif 69 #endif 70 71 /// \macro LLVM_MSC_PREREQ 72 /// Is the compiler MSVC of at least the specified version? 73 /// The common \param version values to check for are: 74 /// * 1910: VS2017, version 15.1 & 15.2 75 /// * 1911: VS2017, version 15.3 & 15.4 76 /// * 1912: VS2017, version 15.5 77 /// * 1913: VS2017, version 15.6 78 /// * 1914: VS2017, version 15.7 79 /// * 1915: VS2017, version 15.8 80 /// * 1916: VS2017, version 15.9 81 /// * 1920: VS2019, version 16.0 82 /// * 1921: VS2019, version 16.1 83 #ifdef _MSC_VER 84 #define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version)) 85 86 // We require at least MSVC 2017. 87 #if !LLVM_MSC_PREREQ(1910) 88 #error LLVM requires at least MSVC 2017. 89 #endif 90 91 #else 92 #define LLVM_MSC_PREREQ(version) 0 93 #endif 94 95 /// Does the compiler support ref-qualifiers for *this? 96 /// 97 /// Sadly, this is separate from just rvalue reference support because GCC 98 /// and MSVC implemented this later than everything else. This appears to be 99 /// corrected in MSVC 2019 but not MSVC 2017. 100 #if __has_feature(cxx_rvalue_references) || defined(__GNUC__) || \ 101 LLVM_MSC_PREREQ(1920) 102 #define LLVM_HAS_RVALUE_REFERENCE_THIS 1 103 #else 104 #define LLVM_HAS_RVALUE_REFERENCE_THIS 0 105 #endif 106 107 /// Expands to '&' if ref-qualifiers for *this are supported. 108 /// 109 /// This can be used to provide lvalue/rvalue overrides of member functions. 110 /// The rvalue override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS 111 #if LLVM_HAS_RVALUE_REFERENCE_THIS 112 #define LLVM_LVALUE_FUNCTION & 113 #else 114 #define LLVM_LVALUE_FUNCTION 115 #endif 116 117 /// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked 118 /// into a shared library, then the class should be private to the library and 119 /// not accessible from outside it. Can also be used to mark variables and 120 /// functions, making them private to any shared library they are linked into. 121 /// On PE/COFF targets, library visibility is the default, so this isn't needed. 122 /// 123 /// LLVM_EXTERNAL_VISIBILITY - classes, functions, and variables marked with 124 /// this attribute will be made public and visible outside of any shared library 125 /// they are linked in to. 126 #if __has_attribute(visibility) && !defined(__MINGW32__) && \ 127 !defined(__CYGWIN__) && !defined(_WIN32) 128 #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden"))) 129 #if defined(LLVM_BUILD_LLVM_DYLIB) || defined(LLVM_BUILD_SHARED_LIBS) 130 #define LLVM_EXTERNAL_VISIBILITY __attribute__((visibility("default"))) 131 #else 132 #define LLVM_EXTERNAL_VISIBILITY 133 #endif 134 #else 135 #define LLVM_LIBRARY_VISIBILITY 136 #define LLVM_EXTERNAL_VISIBILITY 137 #endif 138 139 #if defined(__GNUC__) 140 #define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality) 141 #else 142 #define LLVM_PREFETCH(addr, rw, locality) 143 #endif 144 145 #if __has_attribute(used) 146 #define LLVM_ATTRIBUTE_USED __attribute__((__used__)) 147 #else 148 #define LLVM_ATTRIBUTE_USED 149 #endif 150 151 /// LLVM_NODISCARD - Warn if a type or return value is discarded. 152 153 // Use the 'nodiscard' attribute in C++17 or newer mode. 154 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(nodiscard) 155 #define LLVM_NODISCARD [[nodiscard]] 156 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::warn_unused_result) 157 #define LLVM_NODISCARD [[clang::warn_unused_result]] 158 // Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also 159 // warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518). 160 // Use the 'nodiscard' attribute in C++14 mode only with GCC. 161 // TODO: remove this workaround when PR33518 is resolved. 162 #elif defined(__GNUC__) && LLVM_HAS_CPP_ATTRIBUTE(nodiscard) 163 #define LLVM_NODISCARD [[nodiscard]] 164 #else 165 #define LLVM_NODISCARD 166 #endif 167 168 // Indicate that a non-static, non-const C++ member function reinitializes 169 // the entire object to a known state, independent of the previous state of 170 // the object. 171 // 172 // The clang-tidy check bugprone-use-after-move recognizes this attribute as a 173 // marker that a moved-from object has left the indeterminate state and can be 174 // reused. 175 #if LLVM_HAS_CPP_ATTRIBUTE(clang::reinitializes) 176 #define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]] 177 #else 178 #define LLVM_ATTRIBUTE_REINITIALIZES 179 #endif 180 181 // Some compilers warn about unused functions. When a function is sometimes 182 // used or not depending on build settings (e.g. a function only called from 183 // within "assert"), this attribute can be used to suppress such warnings. 184 // 185 // However, it shouldn't be used for unused *variables*, as those have a much 186 // more portable solution: 187 // (void)unused_var_name; 188 // Prefer cast-to-void wherever it is sufficient. 189 #if __has_attribute(unused) 190 #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__)) 191 #else 192 #define LLVM_ATTRIBUTE_UNUSED 193 #endif 194 195 // FIXME: Provide this for PE/COFF targets. 196 #if __has_attribute(weak) && !defined(__MINGW32__) && !defined(__CYGWIN__) && \ 197 !defined(_WIN32) 198 #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__)) 199 #else 200 #define LLVM_ATTRIBUTE_WEAK 201 #endif 202 203 // Prior to clang 3.2, clang did not accept any spelling of 204 // __has_attribute(const), so assume it is supported. 205 #if defined(__clang__) || defined(__GNUC__) 206 // aka 'CONST' but following LLVM Conventions. 207 #define LLVM_READNONE __attribute__((__const__)) 208 #else 209 #define LLVM_READNONE 210 #endif 211 212 #if __has_attribute(pure) || defined(__GNUC__) 213 // aka 'PURE' but following LLVM Conventions. 214 #define LLVM_READONLY __attribute__((__pure__)) 215 #else 216 #define LLVM_READONLY 217 #endif 218 219 #if __has_attribute(minsize) 220 #define LLVM_ATTRIBUTE_MINSIZE __attribute__((minsize)) 221 #else 222 #define LLVM_ATTRIBUTE_MINSIZE 223 #endif 224 225 #if __has_builtin(__builtin_expect) || defined(__GNUC__) 226 #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true) 227 #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false) 228 #else 229 #define LLVM_LIKELY(EXPR) (EXPR) 230 #define LLVM_UNLIKELY(EXPR) (EXPR) 231 #endif 232 233 /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, 234 /// mark a method "not for inlining". 235 #if __has_attribute(noinline) 236 #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline)) 237 #elif defined(_MSC_VER) 238 #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline) 239 #else 240 #define LLVM_ATTRIBUTE_NOINLINE 241 #endif 242 243 /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do 244 /// so, mark a method "always inline" because it is performance sensitive. 245 #if __has_attribute(always_inline) 246 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline)) 247 #elif defined(_MSC_VER) 248 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline 249 #else 250 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline 251 #endif 252 253 /// LLVM_ATTRIBUTE_NO_DEBUG - On compilers where we have a directive to do 254 /// so, mark a method "no debug" because debug info makes the debugger 255 /// experience worse. 256 #if __has_attribute(nodebug) 257 #define LLVM_ATTRIBUTE_NODEBUG __attribute__((nodebug)) 258 #else 259 #define LLVM_ATTRIBUTE_NODEBUG 260 #endif 261 262 #if __has_attribute(returns_nonnull) 263 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull)) 264 #elif defined(_MSC_VER) 265 #define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_ 266 #else 267 #define LLVM_ATTRIBUTE_RETURNS_NONNULL 268 #endif 269 270 /// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a 271 /// pointer that does not alias any other valid pointer. 272 #ifdef __GNUC__ 273 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__)) 274 #elif defined(_MSC_VER) 275 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict) 276 #else 277 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS 278 #endif 279 280 /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements. 281 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough) 282 #define LLVM_FALLTHROUGH [[fallthrough]] 283 #elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough) 284 #define LLVM_FALLTHROUGH [[gnu::fallthrough]] 285 #elif __has_attribute(fallthrough) 286 #define LLVM_FALLTHROUGH __attribute__((fallthrough)) 287 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::fallthrough) 288 #define LLVM_FALLTHROUGH [[clang::fallthrough]] 289 #else 290 #define LLVM_FALLTHROUGH 291 #endif 292 293 /// LLVM_REQUIRE_CONSTANT_INITIALIZATION - Apply this to globals to ensure that 294 /// they are constant initialized. 295 #if LLVM_HAS_CPP_ATTRIBUTE(clang::require_constant_initialization) 296 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION \ 297 [[clang::require_constant_initialization]] 298 #else 299 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION 300 #endif 301 302 /// LLVM_GSL_OWNER - Apply this to owning classes like SmallVector to enable 303 /// lifetime warnings. 304 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Owner) 305 #define LLVM_GSL_OWNER [[gsl::Owner]] 306 #else 307 #define LLVM_GSL_OWNER 308 #endif 309 310 /// LLVM_GSL_POINTER - Apply this to non-owning classes like 311 /// StringRef to enable lifetime warnings. 312 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Pointer) 313 #define LLVM_GSL_POINTER [[gsl::Pointer]] 314 #else 315 #define LLVM_GSL_POINTER 316 #endif 317 318 /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress 319 /// pedantic diagnostics. 320 #ifdef __GNUC__ 321 #define LLVM_EXTENSION __extension__ 322 #else 323 #define LLVM_EXTENSION 324 #endif 325 326 // LLVM_ATTRIBUTE_DEPRECATED(decl, "message") 327 // This macro will be removed. 328 // Use C++14's attribute instead: [[deprecated("message")]] 329 #define LLVM_ATTRIBUTE_DEPRECATED(decl, message) [[deprecated(message)]] decl 330 331 /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands 332 /// to an expression which states that it is undefined behavior for the 333 /// compiler to reach this point. Otherwise is not defined. 334 #if __has_builtin(__builtin_unreachable) || defined(__GNUC__) 335 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable() 336 #elif defined(_MSC_VER) 337 # define LLVM_BUILTIN_UNREACHABLE __assume(false) 338 #else 339 # define LLVM_BUILTIN_UNREACHABLE 340 #endif 341 342 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression 343 /// which causes the program to exit abnormally. 344 #if __has_builtin(__builtin_trap) || defined(__GNUC__) 345 # define LLVM_BUILTIN_TRAP __builtin_trap() 346 #elif defined(_MSC_VER) 347 // The __debugbreak intrinsic is supported by MSVC, does not require forward 348 // declarations involving platform-specific typedefs (unlike RaiseException), 349 // results in a call to vectored exception handlers, and encodes to a short 350 // instruction that still causes the trapping behavior we want. 351 # define LLVM_BUILTIN_TRAP __debugbreak() 352 #else 353 # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 354 #endif 355 356 /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to 357 /// an expression which causes the program to break while running 358 /// under a debugger. 359 #if __has_builtin(__builtin_debugtrap) 360 # define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap() 361 #elif defined(_MSC_VER) 362 // The __debugbreak intrinsic is supported by MSVC and breaks while 363 // running under the debugger, and also supports invoking a debugger 364 // when the OS is configured appropriately. 365 # define LLVM_BUILTIN_DEBUGTRAP __debugbreak() 366 #else 367 // Just continue execution when built with compilers that have no 368 // support. This is a debugging aid and not intended to force the 369 // program to abort if encountered. 370 # define LLVM_BUILTIN_DEBUGTRAP 371 #endif 372 373 /// \macro LLVM_ASSUME_ALIGNED 374 /// Returns a pointer with an assumed alignment. 375 #if __has_builtin(__builtin_assume_aligned) || defined(__GNUC__) 376 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a) 377 #elif defined(LLVM_BUILTIN_UNREACHABLE) 378 # define LLVM_ASSUME_ALIGNED(p, a) \ 379 (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p))) 380 #else 381 # define LLVM_ASSUME_ALIGNED(p, a) (p) 382 #endif 383 384 /// \macro LLVM_PACKED 385 /// Used to specify a packed structure. 386 /// LLVM_PACKED( 387 /// struct A { 388 /// int i; 389 /// int j; 390 /// int k; 391 /// long long l; 392 /// }); 393 /// 394 /// LLVM_PACKED_START 395 /// struct B { 396 /// int i; 397 /// int j; 398 /// int k; 399 /// long long l; 400 /// }; 401 /// LLVM_PACKED_END 402 #ifdef _MSC_VER 403 # define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop)) 404 # define LLVM_PACKED_START __pragma(pack(push, 1)) 405 # define LLVM_PACKED_END __pragma(pack(pop)) 406 #else 407 # define LLVM_PACKED(d) d __attribute__((packed)) 408 # define LLVM_PACKED_START _Pragma("pack(push, 1)") 409 # define LLVM_PACKED_END _Pragma("pack(pop)") 410 #endif 411 412 /// \macro LLVM_PTR_SIZE 413 /// A constant integer equivalent to the value of sizeof(void*). 414 /// Generally used in combination with alignas or when doing computation in the 415 /// preprocessor. 416 #ifdef __SIZEOF_POINTER__ 417 # define LLVM_PTR_SIZE __SIZEOF_POINTER__ 418 #elif defined(_WIN64) 419 # define LLVM_PTR_SIZE 8 420 #elif defined(_WIN32) 421 # define LLVM_PTR_SIZE 4 422 #elif defined(_MSC_VER) 423 # error "could not determine LLVM_PTR_SIZE as a constant int for MSVC" 424 #else 425 # define LLVM_PTR_SIZE sizeof(void *) 426 #endif 427 428 /// \macro LLVM_MEMORY_SANITIZER_BUILD 429 /// Whether LLVM itself is built with MemorySanitizer instrumentation. 430 #if __has_feature(memory_sanitizer) 431 # define LLVM_MEMORY_SANITIZER_BUILD 1 432 # include <sanitizer/msan_interface.h> 433 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory)) 434 #else 435 # define LLVM_MEMORY_SANITIZER_BUILD 0 436 # define __msan_allocated_memory(p, size) 437 # define __msan_unpoison(p, size) 438 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE 439 #endif 440 441 /// \macro LLVM_ADDRESS_SANITIZER_BUILD 442 /// Whether LLVM itself is built with AddressSanitizer instrumentation. 443 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__) 444 # define LLVM_ADDRESS_SANITIZER_BUILD 1 445 # include <sanitizer/asan_interface.h> 446 #else 447 # define LLVM_ADDRESS_SANITIZER_BUILD 0 448 # define __asan_poison_memory_region(p, size) 449 # define __asan_unpoison_memory_region(p, size) 450 #endif 451 452 /// \macro LLVM_THREAD_SANITIZER_BUILD 453 /// Whether LLVM itself is built with ThreadSanitizer instrumentation. 454 #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__) 455 # define LLVM_THREAD_SANITIZER_BUILD 1 456 #else 457 # define LLVM_THREAD_SANITIZER_BUILD 0 458 #endif 459 460 #if LLVM_THREAD_SANITIZER_BUILD 461 // Thread Sanitizer is a tool that finds races in code. 462 // See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations . 463 // tsan detects these exact functions by name. 464 #ifdef __cplusplus 465 extern "C" { 466 #endif 467 void AnnotateHappensAfter(const char *file, int line, const volatile void *cv); 468 void AnnotateHappensBefore(const char *file, int line, const volatile void *cv); 469 void AnnotateIgnoreWritesBegin(const char *file, int line); 470 void AnnotateIgnoreWritesEnd(const char *file, int line); 471 #ifdef __cplusplus 472 } 473 #endif 474 475 // This marker is used to define a happens-before arc. The race detector will 476 // infer an arc from the begin to the end when they share the same pointer 477 // argument. 478 # define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv) 479 480 // This marker defines the destination of a happens-before arc. 481 # define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv) 482 483 // Ignore any races on writes between here and the next TsanIgnoreWritesEnd. 484 # define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__) 485 486 // Resume checking for racy writes. 487 # define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__) 488 #else 489 # define TsanHappensBefore(cv) 490 # define TsanHappensAfter(cv) 491 # define TsanIgnoreWritesBegin() 492 # define TsanIgnoreWritesEnd() 493 #endif 494 495 /// \macro LLVM_NO_SANITIZE 496 /// Disable a particular sanitizer for a function. 497 #if __has_attribute(no_sanitize) 498 #define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND))) 499 #else 500 #define LLVM_NO_SANITIZE(KIND) 501 #endif 502 503 /// Mark debug helper function definitions like dump() that should not be 504 /// stripped from debug builds. 505 /// Note that you should also surround dump() functions with 506 /// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always 507 /// get stripped in release builds. 508 // FIXME: Move this to a private config.h as it's not usable in public headers. 509 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 510 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED 511 #else 512 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE 513 #endif 514 515 /// \macro LLVM_PRETTY_FUNCTION 516 /// Gets a user-friendly looking function signature for the current scope 517 /// using the best available method on each platform. The exact format of the 518 /// resulting string is implementation specific and non-portable, so this should 519 /// only be used, for example, for logging or diagnostics. 520 #if defined(_MSC_VER) 521 #define LLVM_PRETTY_FUNCTION __FUNCSIG__ 522 #elif defined(__GNUC__) || defined(__clang__) 523 #define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__ 524 #else 525 #define LLVM_PRETTY_FUNCTION __func__ 526 #endif 527 528 /// \macro LLVM_THREAD_LOCAL 529 /// A thread-local storage specifier which can be used with globals, 530 /// extern globals, and static globals. 531 /// 532 /// This is essentially an extremely restricted analog to C++11's thread_local 533 /// support. It uses thread_local if available, falling back on gcc __thread 534 /// if not. __thread doesn't support many of the C++11 thread_local's 535 /// features. You should only use this for PODs that you can statically 536 /// initialize to some constant value. In almost all circumstances this is most 537 /// appropriate for use with a pointer, integer, or small aggregation of 538 /// pointers and integers. 539 #if LLVM_ENABLE_THREADS 540 #if __has_feature(cxx_thread_local) || defined(_MSC_VER) 541 #define LLVM_THREAD_LOCAL thread_local 542 #else 543 // Clang, GCC, and other compatible compilers used __thread prior to C++11 and 544 // we only need the restricted functionality that provides. 545 #define LLVM_THREAD_LOCAL __thread 546 #endif 547 #else // !LLVM_ENABLE_THREADS 548 // If threading is disabled entirely, this compiles to nothing and you get 549 // a normal global variable. 550 #define LLVM_THREAD_LOCAL 551 #endif 552 553 /// \macro LLVM_ENABLE_EXCEPTIONS 554 /// Whether LLVM is built with exception support. 555 #if __has_feature(cxx_exceptions) 556 #define LLVM_ENABLE_EXCEPTIONS 1 557 #elif defined(__GNUC__) && defined(__EXCEPTIONS) 558 #define LLVM_ENABLE_EXCEPTIONS 1 559 #elif defined(_MSC_VER) && defined(_CPPUNWIND) 560 #define LLVM_ENABLE_EXCEPTIONS 1 561 #endif 562 563 /// \macro LLVM_NO_PROFILE_INSTRUMENT_FUNCTION 564 /// Disable the profile instrument for a function. 565 #if __has_attribute(no_profile_instrument_function) 566 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION \ 567 __attribute__((no_profile_instrument_function)) 568 #else 569 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION 570 #endif 571 572 #endif 573