LLVM  7.0.0svn
Compiler.h
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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 // Some compilers warn about unused functions. When a function is sometimes
137 // used or not depending on build settings (e.g. a function only called from
138 // within "assert"), this attribute can be used to suppress such warnings.
139 //
140 // However, it shouldn't be used for unused *variables*, as those have a much
141 // more portable solution:
142 // (void)unused_var_name;
143 // Prefer cast-to-void wherever it is sufficient.
144 #if __has_attribute(unused) || LLVM_GNUC_PREREQ(3, 1, 0)
145 #define LLVM_ATTRIBUTE_UNUSED __attribute__((__unused__))
146 #else
147 #define LLVM_ATTRIBUTE_UNUSED
148 #endif
149 
150 // FIXME: Provide this for PE/COFF targets.
151 #if (__has_attribute(weak) || LLVM_GNUC_PREREQ(4, 0, 0)) && \
152  (!defined(__MINGW32__) && !defined(__CYGWIN__) && !defined(_WIN32))
153 #define LLVM_ATTRIBUTE_WEAK __attribute__((__weak__))
154 #else
155 #define LLVM_ATTRIBUTE_WEAK
156 #endif
157 
158 // Prior to clang 3.2, clang did not accept any spelling of
159 // __has_attribute(const), so assume it is supported.
160 #if defined(__clang__) || defined(__GNUC__)
161 // aka 'CONST' but following LLVM Conventions.
162 #define LLVM_READNONE __attribute__((__const__))
163 #else
164 #define LLVM_READNONE
165 #endif
166 
167 #if __has_attribute(pure) || defined(__GNUC__)
168 // aka 'PURE' but following LLVM Conventions.
169 #define LLVM_READONLY __attribute__((__pure__))
170 #else
171 #define LLVM_READONLY
172 #endif
173 
174 #if __has_builtin(__builtin_expect) || LLVM_GNUC_PREREQ(4, 0, 0)
175 #define LLVM_LIKELY(EXPR) __builtin_expect((bool)(EXPR), true)
176 #define LLVM_UNLIKELY(EXPR) __builtin_expect((bool)(EXPR), false)
177 #else
178 #define LLVM_LIKELY(EXPR) (EXPR)
179 #define LLVM_UNLIKELY(EXPR) (EXPR)
180 #endif
181 
182 /// LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so,
183 /// mark a method "not for inlining".
184 #if __has_attribute(noinline) || LLVM_GNUC_PREREQ(3, 4, 0)
185 #define LLVM_ATTRIBUTE_NOINLINE __attribute__((noinline))
186 #elif defined(_MSC_VER)
187 #define LLVM_ATTRIBUTE_NOINLINE __declspec(noinline)
188 #else
189 #define LLVM_ATTRIBUTE_NOINLINE
190 #endif
191 
192 /// LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do
193 /// so, mark a method "always inline" because it is performance sensitive. GCC
194 /// 3.4 supported this but is buggy in various cases and produces unimplemented
195 /// errors, just use it in GCC 4.0 and later.
196 #if __has_attribute(always_inline) || LLVM_GNUC_PREREQ(4, 0, 0)
197 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
198 #elif defined(_MSC_VER)
199 #define LLVM_ATTRIBUTE_ALWAYS_INLINE __forceinline
200 #else
201 #define LLVM_ATTRIBUTE_ALWAYS_INLINE
202 #endif
203 
204 #ifdef __GNUC__
205 #define LLVM_ATTRIBUTE_NORETURN __attribute__((noreturn))
206 #elif defined(_MSC_VER)
207 #define LLVM_ATTRIBUTE_NORETURN __declspec(noreturn)
208 #else
209 #define LLVM_ATTRIBUTE_NORETURN
210 #endif
211 
212 #if __has_attribute(returns_nonnull) || LLVM_GNUC_PREREQ(4, 9, 0)
213 #define LLVM_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
214 #elif defined(_MSC_VER)
215 #define LLVM_ATTRIBUTE_RETURNS_NONNULL _Ret_notnull_
216 #else
217 #define LLVM_ATTRIBUTE_RETURNS_NONNULL
218 #endif
219 
220 /// \macro LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a
221 /// pointer that does not alias any other valid pointer.
222 #ifdef __GNUC__
223 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __attribute__((__malloc__))
224 #elif defined(_MSC_VER)
225 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS __declspec(restrict)
226 #else
227 #define LLVM_ATTRIBUTE_RETURNS_NOALIAS
228 #endif
229 
230 /// LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
231 #if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
232 #define LLVM_FALLTHROUGH [[fallthrough]]
233 #elif __has_cpp_attribute(gnu::fallthrough)
234 #define LLVM_FALLTHROUGH [[gnu::fallthrough]]
235 #elif !__cplusplus
236 // Workaround for llvm.org/PR23435, since clang 3.6 and below emit a spurious
237 // error when __has_cpp_attribute is given a scoped attribute in C mode.
238 #define LLVM_FALLTHROUGH
239 #elif __has_cpp_attribute(clang::fallthrough)
240 #define LLVM_FALLTHROUGH [[clang::fallthrough]]
241 #else
242 #define LLVM_FALLTHROUGH
243 #endif
244 
245 /// LLVM_EXTENSION - Support compilers where we have a keyword to suppress
246 /// pedantic diagnostics.
247 #ifdef __GNUC__
248 #define LLVM_EXTENSION __extension__
249 #else
250 #define LLVM_EXTENSION
251 #endif
252 
253 // LLVM_ATTRIBUTE_DEPRECATED(decl, "message")
254 #if __has_feature(attribute_deprecated_with_message)
255 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
256  decl __attribute__((deprecated(message)))
257 #elif defined(__GNUC__)
258 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
259  decl __attribute__((deprecated))
260 #elif defined(_MSC_VER)
261 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
262  __declspec(deprecated(message)) decl
263 #else
264 # define LLVM_ATTRIBUTE_DEPRECATED(decl, message) \
265  decl
266 #endif
267 
268 /// LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands
269 /// to an expression which states that it is undefined behavior for the
270 /// compiler to reach this point. Otherwise is not defined.
271 #if __has_builtin(__builtin_unreachable) || LLVM_GNUC_PREREQ(4, 5, 0)
272 # define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
273 #elif defined(_MSC_VER)
274 # define LLVM_BUILTIN_UNREACHABLE __assume(false)
275 #endif
276 
277 /// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
278 /// which causes the program to exit abnormally.
279 #if __has_builtin(__builtin_trap) || LLVM_GNUC_PREREQ(4, 3, 0)
280 # define LLVM_BUILTIN_TRAP __builtin_trap()
281 #elif defined(_MSC_VER)
282 // The __debugbreak intrinsic is supported by MSVC, does not require forward
283 // declarations involving platform-specific typedefs (unlike RaiseException),
284 // results in a call to vectored exception handlers, and encodes to a short
285 // instruction that still causes the trapping behavior we want.
286 # define LLVM_BUILTIN_TRAP __debugbreak()
287 #else
288 # define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0
289 #endif
290 
291 /// LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to
292 /// an expression which causes the program to break while running
293 /// under a debugger.
294 #if __has_builtin(__builtin_debugtrap)
295 # define LLVM_BUILTIN_DEBUGTRAP __builtin_debugtrap()
296 #elif defined(_MSC_VER)
297 // The __debugbreak intrinsic is supported by MSVC and breaks while
298 // running under the debugger, and also supports invoking a debugger
299 // when the OS is configured appropriately.
300 # define LLVM_BUILTIN_DEBUGTRAP __debugbreak()
301 #else
302 // Just continue execution when built with compilers that have no
303 // support. This is a debugging aid and not intended to force the
304 // program to abort if encountered.
305 # define LLVM_BUILTIN_DEBUGTRAP
306 #endif
307 
308 /// \macro LLVM_ASSUME_ALIGNED
309 /// Returns a pointer with an assumed alignment.
310 #if __has_builtin(__builtin_assume_aligned) || LLVM_GNUC_PREREQ(4, 7, 0)
311 # define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
312 #elif defined(LLVM_BUILTIN_UNREACHABLE)
313 // As of today, clang does not support __builtin_assume_aligned.
314 # define LLVM_ASSUME_ALIGNED(p, a) \
315  (((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
316 #else
317 # define LLVM_ASSUME_ALIGNED(p, a) (p)
318 #endif
319 
320 /// \macro LLVM_ALIGNAS
321 /// Used to specify a minimum alignment for a structure or variable.
322 #if __GNUC__ && !__has_feature(cxx_alignas) && !LLVM_GNUC_PREREQ(4, 8, 1)
323 # define LLVM_ALIGNAS(x) __attribute__((aligned(x)))
324 #else
325 # define LLVM_ALIGNAS(x) alignas(x)
326 #endif
327 
328 /// \macro LLVM_PACKED
329 /// Used to specify a packed structure.
330 /// LLVM_PACKED(
331 /// struct A {
332 /// int i;
333 /// int j;
334 /// int k;
335 /// long long l;
336 /// });
337 ///
338 /// LLVM_PACKED_START
339 /// struct B {
340 /// int i;
341 /// int j;
342 /// int k;
343 /// long long l;
344 /// };
345 /// LLVM_PACKED_END
346 #ifdef _MSC_VER
347 # define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
348 # define LLVM_PACKED_START __pragma(pack(push, 1))
349 # define LLVM_PACKED_END __pragma(pack(pop))
350 #else
351 # define LLVM_PACKED(d) d __attribute__((packed))
352 # define LLVM_PACKED_START _Pragma("pack(push, 1)")
353 # define LLVM_PACKED_END _Pragma("pack(pop)")
354 #endif
355 
356 /// \macro LLVM_PTR_SIZE
357 /// A constant integer equivalent to the value of sizeof(void*).
358 /// Generally used in combination with LLVM_ALIGNAS or when doing computation in
359 /// the preprocessor.
360 #ifdef __SIZEOF_POINTER__
361 # define LLVM_PTR_SIZE __SIZEOF_POINTER__
362 #elif defined(_WIN64)
363 # define LLVM_PTR_SIZE 8
364 #elif defined(_WIN32)
365 # define LLVM_PTR_SIZE 4
366 #elif defined(_MSC_VER)
367 # error "could not determine LLVM_PTR_SIZE as a constant int for MSVC"
368 #else
369 # define LLVM_PTR_SIZE sizeof(void *)
370 #endif
371 
372 /// \macro LLVM_MEMORY_SANITIZER_BUILD
373 /// Whether LLVM itself is built with MemorySanitizer instrumentation.
374 #if __has_feature(memory_sanitizer)
375 # define LLVM_MEMORY_SANITIZER_BUILD 1
376 # include <sanitizer/msan_interface.h>
377 #else
378 # define LLVM_MEMORY_SANITIZER_BUILD 0
379 # define __msan_allocated_memory(p, size)
380 # define __msan_unpoison(p, size)
381 #endif
382 
383 /// \macro LLVM_ADDRESS_SANITIZER_BUILD
384 /// Whether LLVM itself is built with AddressSanitizer instrumentation.
385 #if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
386 # define LLVM_ADDRESS_SANITIZER_BUILD 1
387 # include <sanitizer/asan_interface.h>
388 #else
389 # define LLVM_ADDRESS_SANITIZER_BUILD 0
390 # define __asan_poison_memory_region(p, size)
391 # define __asan_unpoison_memory_region(p, size)
392 #endif
393 
394 /// \macro LLVM_THREAD_SANITIZER_BUILD
395 /// Whether LLVM itself is built with ThreadSanitizer instrumentation.
396 #if __has_feature(thread_sanitizer) || defined(__SANITIZE_THREAD__)
397 # define LLVM_THREAD_SANITIZER_BUILD 1
398 #else
399 # define LLVM_THREAD_SANITIZER_BUILD 0
400 #endif
401 
402 #if LLVM_THREAD_SANITIZER_BUILD
403 // Thread Sanitizer is a tool that finds races in code.
404 // See http://code.google.com/p/data-race-test/wiki/DynamicAnnotations .
405 // tsan detects these exact functions by name.
406 #ifdef __cplusplus
407 extern "C" {
408 #endif
409 void AnnotateHappensAfter(const char *file, int line, const volatile void *cv);
410 void AnnotateHappensBefore(const char *file, int line, const volatile void *cv);
411 void AnnotateIgnoreWritesBegin(const char *file, int line);
412 void AnnotateIgnoreWritesEnd(const char *file, int line);
413 #ifdef __cplusplus
414 }
415 #endif
416 
417 // This marker is used to define a happens-before arc. The race detector will
418 // infer an arc from the begin to the end when they share the same pointer
419 // argument.
420 # define TsanHappensBefore(cv) AnnotateHappensBefore(__FILE__, __LINE__, cv)
421 
422 // This marker defines the destination of a happens-before arc.
423 # define TsanHappensAfter(cv) AnnotateHappensAfter(__FILE__, __LINE__, cv)
424 
425 // Ignore any races on writes between here and the next TsanIgnoreWritesEnd.
426 # define TsanIgnoreWritesBegin() AnnotateIgnoreWritesBegin(__FILE__, __LINE__)
427 
428 // Resume checking for racy writes.
429 # define TsanIgnoreWritesEnd() AnnotateIgnoreWritesEnd(__FILE__, __LINE__)
430 #else
431 # define TsanHappensBefore(cv)
432 # define TsanHappensAfter(cv)
433 # define TsanIgnoreWritesBegin()
434 # define TsanIgnoreWritesEnd()
435 #endif
436 
437 /// \macro LLVM_NO_SANITIZE
438 /// Disable a particular sanitizer for a function.
439 #if __has_attribute(no_sanitize)
440 #define LLVM_NO_SANITIZE(KIND) __attribute__((no_sanitize(KIND)))
441 #else
442 #define LLVM_NO_SANITIZE(KIND)
443 #endif
444 
445 /// Mark debug helper function definitions like dump() that should not be
446 /// stripped from debug builds.
447 /// Note that you should also surround dump() functions with
448 /// `#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)` so they do always
449 /// get stripped in release builds.
450 // FIXME: Move this to a private config.h as it's not usable in public headers.
451 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
452 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED
453 #else
454 #define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE
455 #endif
456 
457 /// \macro LLVM_PRETTY_FUNCTION
458 /// Gets a user-friendly looking function signature for the current scope
459 /// using the best available method on each platform. The exact format of the
460 /// resulting string is implementation specific and non-portable, so this should
461 /// only be used, for example, for logging or diagnostics.
462 #if defined(_MSC_VER)
463 #define LLVM_PRETTY_FUNCTION __FUNCSIG__
464 #elif defined(__GNUC__) || defined(__clang__)
465 #define LLVM_PRETTY_FUNCTION __PRETTY_FUNCTION__
466 #else
467 #define LLVM_PRETTY_FUNCTION __func__
468 #endif
469 
470 /// \macro LLVM_THREAD_LOCAL
471 /// A thread-local storage specifier which can be used with globals,
472 /// extern globals, and static globals.
473 ///
474 /// This is essentially an extremely restricted analog to C++11's thread_local
475 /// support, and uses that when available. However, it falls back on
476 /// platform-specific or vendor-provided extensions when necessary. These
477 /// extensions don't support many of the C++11 thread_local's features. You
478 /// should only use this for PODs that you can statically initialize to
479 /// some constant value. In almost all circumstances this is most appropriate
480 /// for use with a pointer, integer, or small aggregation of pointers and
481 /// integers.
482 #if LLVM_ENABLE_THREADS
483 #if __has_feature(cxx_thread_local)
484 #define LLVM_THREAD_LOCAL thread_local
485 #elif defined(_MSC_VER)
486 // MSVC supports this with a __declspec.
487 #define LLVM_THREAD_LOCAL __declspec(thread)
488 #else
489 // Clang, GCC, and other compatible compilers used __thread prior to C++11 and
490 // we only need the restricted functionality that provides.
491 #define LLVM_THREAD_LOCAL __thread
492 #endif
493 #else // !LLVM_ENABLE_THREADS
494 // If threading is disabled entirely, this compiles to nothing and you get
495 // a normal global variable.
496 #define LLVM_THREAD_LOCAL
497 #endif
498 
499 /// \macro LLVM_ENABLE_EXCEPTIONS
500 /// Whether LLVM is built with exception support.
501 #if __has_feature(cxx_exceptions)
502 #define LLVM_ENABLE_EXCEPTIONS 1
503 #elif defined(__GNUC__) && defined(__EXCEPTIONS)
504 #define LLVM_ENABLE_EXCEPTIONS 1
505 #elif defined(_MSC_VER) && defined(_CPPUNWIND)
506 #define LLVM_ENABLE_EXCEPTIONS 1
507 #endif
508 
509 namespace llvm {
510 
511 /// Allocate a buffer of memory with the given size and alignment.
512 ///
513 /// When the compiler supports aligned operator new, this will use it to to
514 /// handle even over-aligned allocations.
515 ///
516 /// However, this doesn't make any attempt to leverage the fancier techniques
517 /// like posix_memalign due to portability. It is mostly intended to allow
518 /// compatibility with platforms that, after aligned allocation was added, use
519 /// reduced default alignment.
520 inline void *allocate_buffer(size_t Size, size_t Alignment) {
521  return ::operator new(Size
522 #if __cpp_aligned_new
523  ,
524  std::align_val_t(Alignment)
525 #endif
526  );
527 }
528 
529 /// Deallocate a buffer of memory with the given size and alignment.
530 ///
531 /// If supported, this will used the sized delete operator. Also if supported,
532 /// this will pass the alignment to the delete operator.
533 ///
534 /// The pointer must have been allocated with the corresponding new operator,
535 /// most likely using the above helper.
536 inline void deallocate_buffer(void *Ptr, size_t Size, size_t Alignment) {
537  ::operator delete(Ptr
538 #if __cpp_sized_deallocation
539  ,
540  Size
541 #endif
542 #if __cpp_aligned_new
543  ,
544  std::align_val_t(Alignment)
545 #endif
546  );
547 }
548 
549 } // End namespace llvm
550 
551 #endif
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
void * allocate_buffer(size_t Size, size_t Alignment)
Allocate a buffer of memory with the given size and alignment.
Definition: Compiler.h:520
dot regions Print regions of function to dot file(with no function bodies)"
void deallocate_buffer(void *Ptr, size_t Size, size_t Alignment)
Deallocate a buffer of memory with the given size and alignment.
Definition: Compiler.h:536
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.