LLVM  14.0.0git
Compiler.h
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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 #define LLVM_EXTERNAL_VISIBILITY __attribute__ ((visibility("default")))
130 #else
131 #define LLVM_LIBRARY_VISIBILITY
132 #define LLVM_EXTERNAL_VISIBILITY
133 #endif
134 
135 #if defined(__GNUC__)
136 #define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
137 #else
138 #define LLVM_PREFETCH(addr, rw, locality)
139 #endif
140 
141 #if __has_attribute(used)
142 #define LLVM_ATTRIBUTE_USED __attribute__((__used__))
143 #else
144 #define LLVM_ATTRIBUTE_USED
145 #endif
146 
147 /// LLVM_NODISCARD - Warn if a type or return value is discarded.
148 
149 // Use the 'nodiscard' attribute in C++17 or newer mode.
150 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
151 #define LLVM_NODISCARD [[nodiscard]]
152 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::warn_unused_result)
153 #define LLVM_NODISCARD [[clang::warn_unused_result]]
154 // Clang in C++14 mode claims that it has the 'nodiscard' attribute, but also
155 // warns in the pedantic mode that 'nodiscard' is a C++17 extension (PR33518).
156 // Use the 'nodiscard' attribute in C++14 mode only with GCC.
157 // TODO: remove this workaround when PR33518 is resolved.
158 #elif defined(__GNUC__) && LLVM_HAS_CPP_ATTRIBUTE(nodiscard)
159 #define LLVM_NODISCARD [[nodiscard]]
160 #else
161 #define LLVM_NODISCARD
162 #endif
163 
164 // Indicate that a non-static, non-const C++ member function reinitializes
165 // the entire object to a known state, independent of the previous state of
166 // the object.
167 //
168 // The clang-tidy check bugprone-use-after-move recognizes this attribute as a
169 // marker that a moved-from object has left the indeterminate state and can be
170 // reused.
171 #if LLVM_HAS_CPP_ATTRIBUTE(clang::reinitializes)
172 #define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
173 #else
174 #define LLVM_ATTRIBUTE_REINITIALIZES
175 #endif
176 
177 // Some compilers warn about unused functions. When a function is sometimes
178 // used or not depending on build settings (e.g. a function only called from
179 // within "assert"), this attribute can be used to suppress such warnings.
180 //
181 // However, it shouldn't be used for unused *variables*, as those have a much
182 // more portable solution:
183 // (void)unused_var_name;
184 // Prefer cast-to-void wherever it is sufficient.
185 #if __has_attribute(unused)
186 #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
187 #else
188 #define LLVM_ATTRIBUTE_UNUSED
189 #endif
190 
191 // FIXME: Provide this for PE/COFF targets.
192 #if __has_attribute(weak) && !defined(__MINGW32__) && !defined(__CYGWIN__) && \
193  !defined(_WIN32)
194 #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
195 #else
196 #define LLVM_ATTRIBUTE_WEAK
197 #endif
198 
199 // Prior to clang 3.2, clang did not accept any spelling of
200 // __has_attribute(const), so assume it is supported.
201 #if defined(__clang__) || defined(__GNUC__)
202 // aka 'CONST' but following LLVM Conventions.
203 #define LLVM_READNONE __attribute__((__const__))
204 #else
205 #define LLVM_READNONE
206 #endif
207 
208 #if __has_attribute(pure) || defined(__GNUC__)
209 // aka 'PURE' but following LLVM Conventions.
210 #define LLVM_READONLY __attribute__((__pure__))
211 #else
212 #define LLVM_READONLY
213 #endif
214 
215 #if __has_attribute(minsize)
216 #define LLVM_ATTRIBUTE_MINSIZE __attribute__((minsize))
217 #else
218 #define LLVM_ATTRIBUTE_MINSIZE
219 #endif
220 
221 #if __has_builtin(__builtin_expect) || defined(__GNUC__)
222 #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
223 #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
224 #else
225 #define LLVM_LIKELY(EXPR) (EXPR)
226 #define LLVM_UNLIKELY(EXPR) (EXPR)
227 #endif
228 
229 /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
230 /// mark a method "not for inlining".
231 #if __has_attribute(noinline)
232 #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
233 #elif defined(_MSC_VER)
234 #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
235 #else
236 #define LLVM_ATTRIBUTE_NOINLINE
237 #endif
238 
239 /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
240 /// so, mark a method "always inline" because it is performance sensitive.
241 #if __has_attribute(always_inline)
242 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline __attribute__((always_inline))
243 #elif defined(_MSC_VER)
244 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
245 #else
246 #define LLVM_ATTRIBUTE_ALWAYS_INLINE inline
247 #endif
248 
249 /// LLVM_ATTRIBUTE_NO_DEBUG - On compilers where we have a directive to do
250 /// so, mark a method "no debug" because debug info makes the debugger
251 /// experience worse.
252 #if __has_attribute(nodebug)
253 #define LLVM_ATTRIBUTE_NODEBUG __attribute__((nodebug))
254 #else
255 #define LLVM_ATTRIBUTE_NODEBUG
256 #endif
257 
258 #if __has_attribute(returns_nonnull)
259 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
260 #elif defined(_MSC_VER)
261 #define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_
262 #else
263 #define LLVM_ATTRIBUTE_RETURNS_NONNULL
264 #endif
265 
266 /// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
267 /// pointer that does not alias any other valid pointer.
268 #ifdef __GNUC__
269 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
270 #elif defined(_MSC_VER)
271 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
272 #else
273 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS
274 #endif
275 
276 /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
277 #if defined(__cplusplus) && __cplusplus > 201402L && LLVM_HAS_CPP_ATTRIBUTE(fallthrough)
278 #define LLVM_FALLTHROUGH [[fallthrough]]
279 #elif LLVM_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
280 #define LLVM_FALLTHROUGH [[gnu::fallthrough]]
281 #elif __has_attribute(fallthrough)
282 #define LLVM_FALLTHROUGH __attribute__((fallthrough))
283 #elif LLVM_HAS_CPP_ATTRIBUTE(clang::fallthrough)
284 #define LLVM_FALLTHROUGH [[clang::fallthrough]]
285 #else
286 #define LLVM_FALLTHROUGH
287 #endif
288 
289 /// LLVM_REQUIRE_CONSTANT_INITIALIZATION - Apply this to globals to ensure that
290 /// they are constant initialized.
291 #if LLVM_HAS_CPP_ATTRIBUTE(clang::require_constant_initialization)
292 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION \
293  [[clang::require_constant_initialization]]
294 #else
295 #define LLVM_REQUIRE_CONSTANT_INITIALIZATION
296 #endif
297 
298 /// LLVM_GSL_OWNER - Apply this to owning classes like SmallVector to enable
299 /// lifetime warnings.
300 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Owner)
301 #define LLVM_GSL_OWNER [[gsl::Owner]]
302 #else
303 #define LLVM_GSL_OWNER
304 #endif
305 
306 /// LLVM_GSL_POINTER - Apply this to non-owning classes like
307 /// StringRef to enable lifetime warnings.
308 #if LLVM_HAS_CPP_ATTRIBUTE(gsl::Pointer)
309 #define LLVM_GSL_POINTER [[gsl::Pointer]]
310 #else
311 #define LLVM_GSL_POINTER
312 #endif
313 
314 /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
315 /// pedantic diagnostics.
316 #ifdef __GNUC__
317 #define LLVM_EXTENSION __extension__
318 #else
319 #define LLVM_EXTENSION
320 #endif
321 
322 // LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
323 // This macro will be removed.
324 // Use C++14's attribute instead: [[deprecated("message")]]
325 #define LLVM_ATTRIBUTE_DEPRECATED(decl, message) [[deprecated(message)]] decl
326 
327 /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
328 /// to an expression which states that it is undefined behavior for the
329 /// compiler to reach this point. Otherwise is not defined.
330 #if __has_builtin(__builtin_unreachable) || defined(__GNUC__)
331 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
332 #elif defined(_MSC_VER)
333 # define LLVM_BUILTIN_UNREACHABLE __assume(false)
334 #else
335 # define LLVM_BUILTIN_UNREACHABLE
336 #endif
337 
338 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
339 /// which causes the program to exit abnormally.
340 #if __has_builtin(__builtin_trap) || defined(__GNUC__)
341 # define LLVM_BUILTIN_TRAP __builtin_trap()
342 #elif defined(_MSC_VER)
343 // The __debugbreak intrinsic is supported by MSVC, does not require forward
344 // declarations involving platform-specific typedefs (unlike RaiseException),
345 // results in a call to vectored exception handlers, and encodes to a short
346 // instruction that still causes the trapping behavior we want.
347 # define LLVM_BUILTIN_TRAP __debugbreak()
348 #else
349 # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
350 #endif
351 
352 /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
353 /// an expression which causes the program to break while running
354 /// under a debugger.
355 #if __has_builtin(__builtin_debugtrap)
356 # define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
357 #elif defined(_MSC_VER)
358 // The __debugbreak intrinsic is supported by MSVC and breaks while
359 // running under the debugger, and also supports invoking a debugger
360 // when the OS is configured appropriately.
361 # define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
362 #else
363 // Just continue execution when built with compilers that have no
364 // support. This is a debugging aid and not intended to force the
365 // program to abort if encountered.
366 # define LLVM_BUILTIN_DEBUGTRAP
367 #endif
368 
369 /// \macro LLVM_ASSUME_ALIGNED
370 /// Returns a pointer with an assumed alignment.
371 #if __has_builtin(__builtin_assume_aligned) || defined(__GNUC__)
372 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
373 #elif defined(LLVM_BUILTIN_UNREACHABLE)
374 # define LLVM_ASSUME_ALIGNED(p, a) \
375  (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
376 #else
377 # define LLVM_ASSUME_ALIGNED(p, a) (p)
378 #endif
379 
380 /// \macro LLVM_PACKED
381 /// Used to specify a packed structure.
382 /// LLVM_PACKED(
383 /// struct A {
384 /// int i;
385 /// int j;
386 /// int k;
387 /// long long l;
388 /// });
389 ///
390 /// LLVM_PACKED_START
391 /// struct B {
392 /// int i;
393 /// int j;
394 /// int k;
395 /// long long l;
396 /// };
397 /// LLVM_PACKED_END
398 #ifdef _MSC_VER
399 # define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
400 # define LLVM_PACKED_START __pragma(pack(push, 1))
401 # define LLVM_PACKED_END __pragma(pack(pop))
402 #else
403 # define LLVM_PACKED(d) d __attribute__((packed))
404 # define LLVM_PACKED_START _Pragma("pack(push, 1)")
405 # define LLVM_PACKED_END _Pragma("pack(pop)")
406 #endif
407 
408 /// \macro LLVM_PTR_SIZE
409 /// A constant integer equivalent to the value of sizeof(void*).
410 /// Generally used in combination with alignas or when doing computation in the
411 /// preprocessor.
412 #ifdef __SIZEOF_POINTER__
413 # define LLVM_PTR_SIZE __SIZEOF_POINTER__
414 #elif defined(_WIN64)
415 # define LLVM_PTR_SIZE 8
416 #elif defined(_WIN32)
417 # define LLVM_PTR_SIZE 4
418 #elif defined(_MSC_VER)
419 # error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
420 #else
421 # define LLVM_PTR_SIZE sizeof(void *)
422 #endif
423 
424 /// \macro LLVM_MEMORY_SANITIZER_BUILD
425 /// Whether LLVM itself is built with MemorySanitizer instrumentation.
426 #if __has_feature(memory_sanitizer)
427 # define LLVM_MEMORY_SANITIZER_BUILD 1
428 # include <sanitizer/msan_interface.h>
429 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE __attribute__((no_sanitize_memory))
430 #else
431 # define LLVM_MEMORY_SANITIZER_BUILD 0
432 # define __msan_allocated_memory(p, size)
433 # define __msan_unpoison(p, size)
434 # define LLVM_NO_SANITIZE_MEMORY_ATTRIBUTE
435 #endif
436 
437 /// \macro LLVM_ADDRESS_SANITIZER_BUILD
438 /// Whether LLVM itself is built with AddressSanitizer instrumentation.
439 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
440 # define LLVM_ADDRESS_SANITIZER_BUILD 1
441 # include <sanitizer/asan_interface.h>
442 #else
443 # define LLVM_ADDRESS_SANITIZER_BUILD 0
444 # define __asan_poison_memory_region(p, size)
445 # define __asan_unpoison_memory_region(p, size)
446 #endif
447 
448 /// \macro LLVM_THREAD_SANITIZER_BUILD
449 /// Whether LLVM itself is built with ThreadSanitizer instrumentation.
450 #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
451 # define LLVM_THREAD_SANITIZER_BUILD 1
452 #else
453 # define LLVM_THREAD_SANITIZER_BUILD 0
454 #endif
455 
456 #if LLVM_THREAD_SANITIZER_BUILD
457 // Thread Sanitizer is a tool that finds races in code.
458 // See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations .
459 // tsan detects these exact functions by name.
460 #ifdef __cplusplus
461 extern "C" {
462 #endif
463 void AnnotateHappensAfter(const char *file, int line, const volatile void *cv);
464 void AnnotateHappensBefore(const char *file, int line, const volatile void *cv);
465 void AnnotateIgnoreWritesBegin(const char *file, int line);
466 void AnnotateIgnoreWritesEnd(const char *file, int line);
467 #ifdef __cplusplus
468 }
469 #endif
470 
471 // This marker is used to define a happens-before arc. The race detector will
472 // infer an arc from the begin to the end when they share the same pointer
473 // argument.
474 # define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
475 
476 // This marker defines the destination of a happens-before arc.
477 # define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
478 
479 // Ignore any races on writes between here and the next TsanIgnoreWritesEnd.
480 # define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
481 
482 // Resume checking for racy writes.
483 # define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
484 #else
485 # define TsanHappensBefore(cv)
486 # define TsanHappensAfter(cv)
487 # define TsanIgnoreWritesBegin()
488 # define TsanIgnoreWritesEnd()
489 #endif
490 
491 /// \macro LLVM_NO_SANITIZE
492 /// Disable a particular sanitizer for a function.
493 #if __has_attribute(no_sanitize)
494 #define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND)))
495 #else
496 #define LLVM_NO_SANITIZE(KIND)
497 #endif
498 
499 /// Mark debug helper function definitions like dump() that should not be
500 /// stripped from debug builds.
501 /// Note that you should also surround dump() functions with
502 /// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always
503 /// get stripped in release builds.
504 // FIXME: Move this to a private config.h as it's not usable in public headers.
505 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
506 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
507 #else
508 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
509 #endif
510 
511 /// \macro LLVM_PRETTY_FUNCTION
512 /// Gets a user-friendly looking function signature for the current scope
513 /// using the best available method on each platform. The exact format of the
514 /// resulting string is implementation specific and non-portable, so this should
515 /// only be used, for example, for logging or diagnostics.
516 #if defined(_MSC_VER)
517 #define LLVM_PRETTY_FUNCTION __FUNCSIG__
518 #elif defined(__GNUC__) || defined(__clang__)
519 #define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__
520 #else
521 #define LLVM_PRETTY_FUNCTION __func__
522 #endif
523 
524 /// \macro LLVM_THREAD_LOCAL
525 /// A thread-local storage specifier which can be used with globals,
526 /// extern globals, and static globals.
527 ///
528 /// This is essentially an extremely restricted analog to C++11's thread_local
529 /// support. It uses thread_local if available, falling back on gcc __thread
530 /// if not. __thread doesn't support many of the C++11 thread_local's
531 /// features. You should only use this for PODs that you can statically
532 /// initialize to some constant value. In almost all circumstances this is most
533 /// appropriate for use with a pointer, integer, or small aggregation of
534 /// pointers and integers.
535 #if LLVM_ENABLE_THREADS
536 #if __has_feature(cxx_thread_local) || defined(_MSC_VER)
537 #define LLVM_THREAD_LOCAL thread_local
538 #else
539 // Clang, GCC, and other compatible compilers used __thread prior to C++11 and
540 // we only need the restricted functionality that provides.
541 #define LLVM_THREAD_LOCAL __thread
542 #endif
543 #else // !LLVM_ENABLE_THREADS
544 // If threading is disabled entirely, this compiles to nothing and you get
545 // a normal global variable.
546 #define LLVM_THREAD_LOCAL
547 #endif
548 
549 /// \macro LLVM_ENABLE_EXCEPTIONS
550 /// Whether LLVM is built with exception support.
551 #if __has_feature(cxx_exceptions)
552 #define LLVM_ENABLE_EXCEPTIONS 1
553 #elif defined(__GNUC__) && defined(__EXCEPTIONS)
554 #define LLVM_ENABLE_EXCEPTIONS 1
555 #elif defined(_MSC_VER) && defined(_CPPUNWIND)
556 #define LLVM_ENABLE_EXCEPTIONS 1
557 #endif
558 
559 /// \macro LLVM_NO_PROFILE_INSTRUMENT_FUNCTION
560 /// Disable the profile instrument for a function.
561 #if __has_attribute(no_profile_instrument_function)
562 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION \
563  __attribute__((no_profile_instrument_function))
564 #else
565 #define LLVM_NO_PROFILE_INSTRUMENT_FUNCTION
566 #endif
567 
568 #endif
file
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