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1 : //===-- llvm/Support/Compiler.h - Compiler abstraction support --*- C++ -*-===//
2 : //
3 : // The LLVM Compiler Infrastructure
4 : //
5 : // This file is distributed under the University of Illinois Open Source
6 : // License. See LICENSE.TXT for details.
7 : //
8 : //===----------------------------------------------------------------------===//
9 : //
10 : // This file defines several macros, based on the current compiler. This allows
11 : // use of compiler-specific features in a way that remains portable.
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 <new>
21 : #include <stddef.h>
22 :
23 : #if defined(_MSC_VER)
24 : #include <sal.h>
25 : #endif
26 :
27 : #ifndef __has_feature
28 : # define __has_feature(x) 0
29 : #endif
30 :
31 : #ifndef __has_extension
32 : # define __has_extension(x) 0
33 : #endif
34 :
35 : #ifndef __has_attribute
36 : # define __has_attribute(x) 0
37 : #endif
38 :
39 : #ifndef __has_cpp_attribute
40 : # define __has_cpp_attribute(x) 0
41 : #endif
42 :
43 : #ifndef __has_builtin
44 : # define __has_builtin(x) 0
45 : #endif
46 :
47 : /// \macro LLVM_GNUC_PREREQ
48 : /// Extend the default __GNUC_PREREQ even if glibc's features.h isn't
49 : /// available.
50 : #ifndef LLVM_GNUC_PREREQ
51 : # if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
52 : # define LLVM_GNUC_PREREQ(maj, min, patch) \
53 : ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) + __GNUC_PATCHLEVEL__ >= \
54 : ((maj) << 20) + ((min) << 10) + (patch))
55 : # elif defined(__GNUC__) && defined(__GNUC_MINOR__)
56 : # define LLVM_GNUC_PREREQ(maj, min, patch) \
57 : ((__GNUC__ << 20) + (__GNUC_MINOR__ << 10) >= ((maj) << 20) + ((min) << 10))
58 : # else
59 : # define LLVM_GNUC_PREREQ(maj, min, patch) 0
60 : # endif
61 : #endif
62 :
63 : /// \macro LLVM_MSC_PREREQ
64 : /// Is the compiler MSVC of at least the specified version?
65 : /// The common \param version values to check for are:
66 : /// * 1900: Microsoft Visual Studio 2015 / 14.0
67 : #ifdef _MSC_VER
68 : #define LLVM_MSC_PREREQ(version) (_MSC_VER >= (version))
69 :
70 : // We require at least MSVC 2015.
71 : #if !LLVM_MSC_PREREQ(1900)
72 : #error LLVM requires at least MSVC 2015.
73 : #endif
74 :
75 : #else
76 : #define LLVM_MSC_PREREQ(version) 0
77 : #endif
78 :
79 : /// Does the compiler support ref-qualifiers for *this?
80 : ///
81 : /// Sadly, this is separate from just rvalue reference support because GCC
82 : /// and MSVC implemented this later than everything else.
83 : #if __has_feature(cxx_rvalue_references) || LLVM_GNUC_PREREQ(4, 8, 1)
84 : #define LLVM_HAS_RVALUE_REFERENCE_THIS 1
85 : #else
86 : #define LLVM_HAS_RVALUE_REFERENCE_THIS 0
87 : #endif
88 :
89 : /// Expands to '&' if ref-qualifiers for *this are supported.
90 : ///
91 : /// This can be used to provide lvalue/rvalue overrides of member functions.
92 : /// The rvalue override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS
93 : #if LLVM_HAS_RVALUE_REFERENCE_THIS
94 : #define LLVM_LVALUE_FUNCTION &
95 : #else
96 : #define LLVM_LVALUE_FUNCTION
97 : #endif
98 :
99 : /// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked
100 : /// into a shared library, then the class should be private to the library and
101 : /// not accessible from outside it. Can also be used to mark variables and
102 : /// functions, making them private to any shared library they are linked into.
103 : /// On PE/COFF targets, library visibility is the default, so this isn't needed.
104 : #if (__has_attribute(visibility) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
105 : !defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32)
106 : #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
107 : #else
108 : #define LLVM_LIBRARY_VISIBILITY
109 : #endif
110 :
111 : #if defined(__GNUC__)
112 : #define LLVM_PREFETCH(addr, rw, locality) __builtin_prefetch(addr, rw, locality)
113 : #else
114 : #define LLVM_PREFETCH(addr, rw, locality)
115 : #endif
116 :
117 : #if __has_attribute(used) || LLVM_GNUC_PREREQ(3, 1, 0)
118 : #define LLVM_ATTRIBUTE_USED __attribute__((__used__))
119 : #else
120 : #define LLVM_ATTRIBUTE_USED
121 : #endif
122 :
123 : /// LLVM_NODISCARD - Warn if a type or return value is discarded.
124 : #if __cplusplus > 201402L && __has_cpp_attribute(nodiscard)
125 : #define LLVM_NODISCARD [[nodiscard]]
126 : #elif !__cplusplus
127 : // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
128 : // error when __has_cpp_attribute is given a scoped attribute in C mode.
129 : #define LLVM_NODISCARD
130 : #elif __has_cpp_attribute(clang::warn_unused_result)
131 : #define LLVM_NODISCARD [[clang::warn_unused_result]]
132 : #else
133 : #define LLVM_NODISCARD
134 : #endif
135 :
136 : // Indicate that a non-static, non-const C++ member function reinitializes
137 : // the entire object to a known state, independent of the previous state of
138 : // the object.
139 : //
140 : // The clang-tidy check bugprone-use-after-move recognizes this attribute as a
141 : // marker that a moved-from object has left the indeterminate state and can be
142 : // reused.
143 : #if __has_cpp_attribute(clang::reinitializes)
144 : #define LLVM_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
145 : #else
146 : #define LLVM_ATTRIBUTE_REINITIALIZES
147 : #endif
148 :
149 : // Some compilers warn about unused functions. When a function is sometimes
150 : // used or not depending on build settings (e.g. a function only called from
151 : // within "assert"), this attribute can be used to suppress such warnings.
152 : //
153 : // However, it shouldn't be used for unused *variables*, as those have a much
154 : // more portable solution:
155 : // (void)unused_var_name;
156 : // Prefer cast-to-void wherever it is sufficient.
157 : #if __has_attribute(unused) || LLVM_GNUC_PREREQ(3, 1, 0)
158 : #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
159 : #else
160 : #define LLVM_ATTRIBUTE_UNUSED
161 : #endif
162 :
163 : // FIXME: Provide this for PE/COFF targets.
164 : #if (__has_attribute(weak) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
165 : (!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32))
166 : #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
167 : #else
168 : #define LLVM_ATTRIBUTE_WEAK
169 : #endif
170 :
171 : // Prior to clang 3.2, clang did not accept any spelling of
172 : // __has_attribute(const), so assume it is supported.
173 : #if defined(__clang__) || defined(__GNUC__)
174 : // aka 'CONST' but following LLVM Conventions.
175 : #define LLVM_READNONE __attribute__((__const__))
176 : #else
177 : #define LLVM_READNONE
178 : #endif
179 :
180 : #if __has_attribute(pure) || defined(__GNUC__)
181 : // aka 'PURE' but following LLVM Conventions.
182 : #define LLVM_READONLY __attribute__((__pure__))
183 : #else
184 : #define LLVM_READONLY
185 : #endif
186 :
187 : #if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
188 : #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
189 : #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
190 : #else
191 : #define LLVM_LIKELY(EXPR) (EXPR)
192 : #define LLVM_UNLIKELY(EXPR) (EXPR)
193 : #endif
194 :
195 : /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
196 : /// mark a method "not for inlining".
197 : #if __has_attribute(noinline) || LLVM_GNUC_PREREQ(3, 4, 0)
198 : #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
199 : #elif defined(_MSC_VER)
200 : #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
201 : #else
202 : #define LLVM_ATTRIBUTE_NOINLINE
203 : #endif
204 :
205 : /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
206 : /// so, mark a method "always inline" because it is performance sensitive. GCC
207 : /// 3.4 supported this but is buggy in various cases and produces unimplemented
208 : /// errors, just use it in GCC 4.0 and later.
209 : #if __has_attribute(always_inline) || LLVM_GNUC_PREREQ(4, 0, 0)
210 : #define LLVM_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
211 : #elif defined(_MSC_VER)
212 : #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
213 : #else
214 : #define LLVM_ATTRIBUTE_ALWAYS_INLINE
215 : #endif
216 :
217 : #ifdef __GNUC__
218 : #define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
219 : #elif defined(_MSC_VER)
220 : #define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
221 : #else
222 : #define LLVM_ATTRIBUTE_NORETURN
223 : #endif
224 :
225 : #if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
226 : #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
227 : #elif defined(_MSC_VER)
228 : #define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_
229 : #else
230 : #define LLVM_ATTRIBUTE_RETURNS_NONNULL
231 : #endif
232 :
233 : /// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
234 : /// pointer that does not alias any other valid pointer.
235 : #ifdef __GNUC__
236 : #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
237 : #elif defined(_MSC_VER)
238 : #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
239 : #else
240 : #define LLVM_ATTRIBUTE_RETURNS_NOALIAS
241 : #endif
242 :
243 : /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
244 : #if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
245 : #define LLVM_FALLTHROUGH [[fallthrough]]
246 : #elif __has_cpp_attribute(gnu::fallthrough)
247 : #define LLVM_FALLTHROUGH [[gnu::fallthrough]]
248 : #elif !__cplusplus
249 : // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
250 : // error when __has_cpp_attribute is given a scoped attribute in C mode.
251 : #define LLVM_FALLTHROUGH
252 : #elif __has_cpp_attribute(clang::fallthrough)
253 : #define LLVM_FALLTHROUGH [[clang::fallthrough]]
254 : #else
255 : #define LLVM_FALLTHROUGH
256 : #endif
257 :
258 : /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
259 : /// pedantic diagnostics.
260 : #ifdef __GNUC__
261 : #define LLVM_EXTENSION __extension__
262 : #else
263 : #define LLVM_EXTENSION
264 : #endif
265 :
266 : // LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
267 : #if __has_feature(attribute_deprecated_with_message)
268 : # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
269 : decl __attribute__((deprecated(message)))
270 : #elif defined(__GNUC__)
271 : # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
272 : decl __attribute__((deprecated))
273 : #elif defined(_MSC_VER)
274 : # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
275 : __declspec(deprecated(message)) decl
276 : #else
277 : # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
278 : decl
279 : #endif
280 :
281 : /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
282 : /// to an expression which states that it is undefined behavior for the
283 : /// compiler to reach this point. Otherwise is not defined.
284 : #if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0)
285 : # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
286 : #elif defined(_MSC_VER)
287 : # define LLVM_BUILTIN_UNREACHABLE __assume(false)
288 : #endif
289 :
290 : /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
291 : /// which causes the program to exit abnormally.
292 : #if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
293 : # define LLVM_BUILTIN_TRAP __builtin_trap()
294 : #elif defined(_MSC_VER)
295 : // The __debugbreak intrinsic is supported by MSVC, does not require forward
296 : // declarations involving platform-specific typedefs (unlike RaiseException),
297 : // results in a call to vectored exception handlers, and encodes to a short
298 : // instruction that still causes the trapping behavior we want.
299 : # define LLVM_BUILTIN_TRAP __debugbreak()
300 : #else
301 : # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
302 : #endif
303 :
304 : /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
305 : /// an expression which causes the program to break while running
306 : /// under a debugger.
307 : #if __has_builtin(__builtin_debugtrap)
308 : # define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
309 : #elif defined(_MSC_VER)
310 : // The __debugbreak intrinsic is supported by MSVC and breaks while
311 : // running under the debugger, and also supports invoking a debugger
312 : // when the OS is configured appropriately.
313 : # define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
314 : #else
315 : // Just continue execution when built with compilers that have no
316 : // support. This is a debugging aid and not intended to force the
317 : // program to abort if encountered.
318 : # define LLVM_BUILTIN_DEBUGTRAP
319 : #endif
320 :
321 : /// \macro LLVM_ASSUME_ALIGNED
322 : /// Returns a pointer with an assumed alignment.
323 : #if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)
324 : # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
325 : #elif defined(LLVM_BUILTIN_UNREACHABLE)
326 : // As of today, clang does not support __builtin_assume_aligned.
327 : # define LLVM_ASSUME_ALIGNED(p, a) \
328 : (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
329 : #else
330 : # define LLVM_ASSUME_ALIGNED(p, a) (p)
331 : #endif
332 :
333 : /// \macro LLVM_ALIGNAS
334 : /// Used to specify a minimum alignment for a structure or variable.
335 : #if __GNUC__ && !__has_feature(cxx_alignas) && !LLVM_GNUC_PREREQ(4, 8, 1)
336 : # define LLVM_ALIGNAS(x) __attribute__((aligned(x)))
337 : #else
338 : # define LLVM_ALIGNAS(x) alignas(x)
339 : #endif
340 :
341 : /// \macro LLVM_PACKED
342 : /// Used to specify a packed structure.
343 : /// LLVM_PACKED(
344 : /// struct A {
345 : /// int i;
346 : /// int j;
347 : /// int k;
348 : /// long long l;
349 : /// });
350 : ///
351 : /// LLVM_PACKED_START
352 : /// struct B {
353 : /// int i;
354 : /// int j;
355 : /// int k;
356 : /// long long l;
357 : /// };
358 : /// LLVM_PACKED_END
359 : #ifdef _MSC_VER
360 : # define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
361 : # define LLVM_PACKED_START __pragma(pack(push, 1))
362 : # define LLVM_PACKED_END __pragma(pack(pop))
363 : #else
364 : # define LLVM_PACKED(d) d __attribute__((packed))
365 : # define LLVM_PACKED_START _Pragma("pack(push, 1)")
366 : # define LLVM_PACKED_END _Pragma("pack(pop)")
367 : #endif
368 :
369 : /// \macro LLVM_PTR_SIZE
370 : /// A constant integer equivalent to the value of sizeof(void*).
371 : /// Generally used in combination with LLVM_ALIGNAS or when doing computation in
372 : /// the preprocessor.
373 : #ifdef __SIZEOF_POINTER__
374 : # define LLVM_PTR_SIZE __SIZEOF_POINTER__
375 : #elif defined(_WIN64)
376 : # define LLVM_PTR_SIZE 8
377 : #elif defined(_WIN32)
378 : # define LLVM_PTR_SIZE 4
379 : #elif defined(_MSC_VER)
380 : # error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
381 : #else
382 : # define LLVM_PTR_SIZE sizeof(void *)
383 : #endif
384 :
385 : /// \macro LLVM_MEMORY_SANITIZER_BUILD
386 : /// Whether LLVM itself is built with MemorySanitizer instrumentation.
387 : #if __has_feature(memory_sanitizer)
388 : # define LLVM_MEMORY_SANITIZER_BUILD 1
389 : # include <sanitizer/msan_interface.h>
390 : #else
391 : # define LLVM_MEMORY_SANITIZER_BUILD 0
392 : # define __msan_allocated_memory(p, size)
393 : # define __msan_unpoison(p, size)
394 : #endif
395 :
396 : /// \macro LLVM_ADDRESS_SANITIZER_BUILD
397 : /// Whether LLVM itself is built with AddressSanitizer instrumentation.
398 : #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
399 : # define LLVM_ADDRESS_SANITIZER_BUILD 1
400 : # include <sanitizer/asan_interface.h>
401 : #else
402 : # define LLVM_ADDRESS_SANITIZER_BUILD 0
403 : # define __asan_poison_memory_region(p, size)
404 : # define __asan_unpoison_memory_region(p, size)
405 : #endif
406 :
407 : /// \macro LLVM_THREAD_SANITIZER_BUILD
408 : /// Whether LLVM itself is built with ThreadSanitizer instrumentation.
409 : #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
410 : # define LLVM_THREAD_SANITIZER_BUILD 1
411 : #else
412 : # define LLVM_THREAD_SANITIZER_BUILD 0
413 : #endif
414 :
415 : #if LLVM_THREAD_SANITIZER_BUILD
416 : // Thread Sanitizer is a tool that finds races in code.
417 : // See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations .
418 : // tsan detects these exact functions by name.
419 : #ifdef __cplusplus
420 : extern "C" {
421 : #endif
422 : void AnnotateHappensAfter(const char *file, int line, const volatile void *cv);
423 : void AnnotateHappensBefore(const char *file, int line, const volatile void *cv);
424 : void AnnotateIgnoreWritesBegin(const char *file, int line);
425 : void AnnotateIgnoreWritesEnd(const char *file, int line);
426 : #ifdef __cplusplus
427 : }
428 : #endif
429 :
430 : // This marker is used to define a happens-before arc. The race detector will
431 : // infer an arc from the begin to the end when they share the same pointer
432 : // argument.
433 : # define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
434 :
435 : // This marker defines the destination of a happens-before arc.
436 : # define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
437 :
438 : // Ignore any races on writes between here and the next TsanIgnoreWritesEnd.
439 : # define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
440 :
441 : // Resume checking for racy writes.
442 : # define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
443 : #else
444 : # define TsanHappensBefore(cv)
445 : # define TsanHappensAfter(cv)
446 : # define TsanIgnoreWritesBegin()
447 : # define TsanIgnoreWritesEnd()
448 : #endif
449 :
450 : /// \macro LLVM_NO_SANITIZE
451 : /// Disable a particular sanitizer for a function.
452 : #if __has_attribute(no_sanitize)
453 : #define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND)))
454 : #else
455 : #define LLVM_NO_SANITIZE(KIND)
456 : #endif
457 :
458 : /// Mark debug helper function definitions like dump() that should not be
459 : /// stripped from debug builds.
460 : /// Note that you should also surround dump() functions with
461 : /// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always
462 : /// get stripped in release builds.
463 : // FIXME: Move this to a private config.h as it's not usable in public headers.
464 : #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
465 : #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
466 : #else
467 : #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
468 : #endif
469 :
470 : /// \macro LLVM_PRETTY_FUNCTION
471 : /// Gets a user-friendly looking function signature for the current scope
472 : /// using the best available method on each platform. The exact format of the
473 : /// resulting string is implementation specific and non-portable, so this should
474 : /// only be used, for example, for logging or diagnostics.
475 : #if defined(_MSC_VER)
476 : #define LLVM_PRETTY_FUNCTION __FUNCSIG__
477 : #elif defined(__GNUC__) || defined(__clang__)
478 : #define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__
479 : #else
480 : #define LLVM_PRETTY_FUNCTION __func__
481 : #endif
482 :
483 : /// \macro LLVM_THREAD_LOCAL
484 : /// A thread-local storage specifier which can be used with globals,
485 : /// extern globals, and static globals.
486 : ///
487 : /// This is essentially an extremely restricted analog to C++11's thread_local
488 : /// support, and uses that when available. However, it falls back on
489 : /// platform-specific or vendor-provided extensions when necessary. These
490 : /// extensions don't support many of the C++11 thread_local's features. You
491 : /// should only use this for PODs that you can statically initialize to
492 : /// some constant value. In almost all circumstances this is most appropriate
493 : /// for use with a pointer, integer, or small aggregation of pointers and
494 : /// integers.
495 : #if LLVM_ENABLE_THREADS
496 : #if __has_feature(cxx_thread_local)
497 : #define LLVM_THREAD_LOCAL thread_local
498 : #elif defined(_MSC_VER)
499 : // MSVC supports this with a __declspec.
500 : #define LLVM_THREAD_LOCAL __declspec(thread)
501 : #else
502 : // Clang, GCC, and other compatible compilers used __thread prior to C++11 and
503 : // we only need the restricted functionality that provides.
504 : #define LLVM_THREAD_LOCAL __thread
505 : #endif
506 : #else // !LLVM_ENABLE_THREADS
507 : // If threading is disabled entirely, this compiles to nothing and you get
508 : // a normal global variable.
509 : #define LLVM_THREAD_LOCAL
510 : #endif
511 :
512 : /// \macro LLVM_ENABLE_EXCEPTIONS
513 : /// Whether LLVM is built with exception support.
514 : #if __has_feature(cxx_exceptions)
515 : #define LLVM_ENABLE_EXCEPTIONS 1
516 : #elif defined(__GNUC__) && defined(__EXCEPTIONS)
517 : #define LLVM_ENABLE_EXCEPTIONS 1
518 : #elif defined(_MSC_VER) && defined(_CPPUNWIND)
519 : #define LLVM_ENABLE_EXCEPTIONS 1
520 : #endif
521 :
522 : namespace llvm {
523 :
524 : /// Allocate a buffer of memory with the given size and alignment.
525 : ///
526 : /// When the compiler supports aligned operator new, this will use it to to
527 : /// handle even over-aligned allocations.
528 : ///
529 : /// However, this doesn't make any attempt to leverage the fancier techniques
530 : /// like posix_memalign due to portability. It is mostly intended to allow
531 : /// compatibility with platforms that, after aligned allocation was added, use
532 : /// reduced default alignment.
533 0 : inline void *allocate_buffer(size_t Size, size_t Alignment) {
534 267 : return ::operator new(Size
535 : #ifdef __cpp_aligned_new
536 : ,
537 : std::align_val_t(Alignment)
538 : #endif
539 0 : );
540 : }
541 :
542 : /// Deallocate a buffer of memory with the given size and alignment.
543 : ///
544 : /// If supported, this will used the sized delete operator. Also if supported,
545 : /// this will pass the alignment to the delete operator.
546 : ///
547 : /// The pointer must have been allocated with the corresponding new operator,
548 : /// most likely using the above helper.
549 0 : inline void deallocate_buffer(void *Ptr, size_t Size, size_t Alignment) {
550 267 : ::operator delete(Ptr
551 : #ifdef __cpp_sized_deallocation
552 : ,
553 : Size
554 : #endif
555 : #ifdef __cpp_aligned_new
556 : ,
557 : std::align_val_t(Alignment)
558 : #endif
559 : );
560 0 : }
561 :
562 : } // End namespace llvm
563 :
564 : #endif
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