LLVM
8.0.1
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#include "llvm/Config/llvm-config.h"
#include <new>
#include <stddef.h>
Go to the source code of this file.
Namespaces | |
llvm | |
This class represents lattice values for constants. | |
Macros | |
#define | __has_feature(x) 0 |
#define | __has_extension(x) 0 |
#define | __has_attribute(x) 0 |
#define | __has_cpp_attribute(x) 0 |
#define | __has_builtin(x) 0 |
#define | LLVM_GNUC_PREREQ(maj, min, patch) 0 |
LLVM_GNUC_PREREQ Extend the default __GNUC_PREREQ even if glibc's features.h isn't available. More... | |
#define | LLVM_MSC_PREREQ(version) 0 |
LLVM_MSC_PREREQ Is the compiler MSVC of at least the specified version? The common More... | |
#define | LLVM_HAS_RVALUE_REFERENCE_THIS 0 |
Does the compiler support ref-qualifiers for *this? More... | |
#define | LLVM_LVALUE_FUNCTION |
Expands to '&' if ref-qualifiers for *this are supported. More... | |
#define | LLVM_LIBRARY_VISIBILITY |
LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked into a shared library, then the class should be private to the library and not accessible from outside it. More... | |
#define | LLVM_PREFETCH(addr, rw, locality) |
#define | LLVM_ATTRIBUTE_USED |
#define | LLVM_NODISCARD |
LLVM_NODISCARD - Warn if a type or return value is discarded. More... | |
#define | LLVM_ATTRIBUTE_REINITIALIZES |
#define | LLVM_ATTRIBUTE_UNUSED |
#define | LLVM_ATTRIBUTE_WEAK |
#define | LLVM_READNONE |
#define | LLVM_READONLY |
#define | LLVM_LIKELY(EXPR) (EXPR) |
#define | LLVM_UNLIKELY(EXPR) (EXPR) |
#define | LLVM_ATTRIBUTE_NOINLINE |
LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, mark a method "not for inlining". More... | |
#define | LLVM_ATTRIBUTE_ALWAYS_INLINE |
LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do so, mark a method "always inline" because it is performance sensitive. More... | |
#define | LLVM_ATTRIBUTE_NORETURN |
#define | LLVM_ATTRIBUTE_RETURNS_NONNULL |
#define | LLVM_ATTRIBUTE_RETURNS_NOALIAS |
LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a pointer that does not alias any other valid pointer. More... | |
#define | LLVM_FALLTHROUGH |
LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements. More... | |
#define | LLVM_EXTENSION |
LLVM_EXTENSION - Support compilers where we have a keyword to suppress pedantic diagnostics. More... | |
#define | LLVM_ATTRIBUTE_DEPRECATED(decl, message) decl |
#define | LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 |
LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands to an expression which states that it is undefined behavior for the compiler to reach this point. More... | |
#define | LLVM_BUILTIN_DEBUGTRAP |
LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to an expression which causes the program to break while running under a debugger. More... | |
#define | LLVM_ASSUME_ALIGNED(p, a) (p) |
LLVM_ASSUME_ALIGNED Returns a pointer with an assumed alignment. More... | |
#define | LLVM_ALIGNAS(x) alignas(x) |
LLVM_ALIGNAS Used to specify a minimum alignment for a structure or variable. More... | |
#define | LLVM_PACKED(d) d __attribute__((packed)) |
LLVM_PACKED Used to specify a packed structure. More... | |
#define | LLVM_PACKED_START _Pragma("pack(push, 1)") |
#define | LLVM_PACKED_END _Pragma("pack(pop)") |
#define | LLVM_PTR_SIZE sizeof(void *) |
LLVM_PTR_SIZE A constant integer equivalent to the value of sizeof(void*). More... | |
#define | LLVM_MEMORY_SANITIZER_BUILD 0 |
LLVM_MEMORY_SANITIZER_BUILD Whether LLVM itself is built with MemorySanitizer instrumentation. More... | |
#define | __msan_allocated_memory(p, size) |
#define | __msan_unpoison(p, size) |
#define | LLVM_ADDRESS_SANITIZER_BUILD 0 |
LLVM_ADDRESS_SANITIZER_BUILD Whether LLVM itself is built with AddressSanitizer instrumentation. More... | |
#define | __asan_poison_memory_region(p, size) |
#define | __asan_unpoison_memory_region(p, size) |
#define | LLVM_THREAD_SANITIZER_BUILD 0 |
LLVM_THREAD_SANITIZER_BUILD Whether LLVM itself is built with ThreadSanitizer instrumentation. More... | |
#define | TsanHappensBefore(cv) |
#define | TsanHappensAfter(cv) |
#define | TsanIgnoreWritesBegin() |
#define | TsanIgnoreWritesEnd() |
#define | LLVM_NO_SANITIZE(KIND) |
LLVM_NO_SANITIZE Disable a particular sanitizer for a function. More... | |
#define | LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED |
Mark debug helper function definitions like dump() that should not be stripped from debug builds. More... | |
#define | LLVM_PRETTY_FUNCTION __func__ |
LLVM_PRETTY_FUNCTION Gets a user-friendly looking function signature for the current scope using the best available method on each platform. More... | |
#define | LLVM_THREAD_LOCAL __thread |
LLVM_THREAD_LOCAL A thread-local storage specifier which can be used with globals, extern globals, and static globals. More... | |
Functions | |
void * | llvm::allocate_buffer (size_t Size, size_t Alignment) |
Allocate a buffer of memory with the given size and alignment. More... | |
void | llvm::deallocate_buffer (void *Ptr, size_t Size, size_t Alignment) |
Deallocate a buffer of memory with the given size and alignment. More... | |
#define __asan_poison_memory_region | ( | p, | |
size | |||
) |
Definition at line 403 of file Compiler.h.
Referenced by llvm::BumpPtrAllocatorImpl< MallocAllocator, 65536 >::Deallocate().
#define __asan_unpoison_memory_region | ( | p, | |
size | |||
) |
Definition at line 404 of file Compiler.h.
#define __has_attribute | ( | x | ) | 0 |
Definition at line 36 of file Compiler.h.
#define __has_builtin | ( | x | ) | 0 |
Definition at line 44 of file Compiler.h.
#define __has_cpp_attribute | ( | x | ) | 0 |
Definition at line 40 of file Compiler.h.
#define __has_extension | ( | x | ) | 0 |
Definition at line 32 of file Compiler.h.
#define __has_feature | ( | x | ) | 0 |
Definition at line 28 of file Compiler.h.
#define __msan_allocated_memory | ( | p, | |
size | |||
) |
Definition at line 392 of file Compiler.h.
#define __msan_unpoison | ( | p, | |
size | |||
) |
Definition at line 393 of file Compiler.h.
Referenced by llvm::zlib::compress(), and llvm::zlib::uncompress().
#define LLVM_ADDRESS_SANITIZER_BUILD 0 |
LLVM_ADDRESS_SANITIZER_BUILD Whether LLVM itself is built with AddressSanitizer instrumentation.
Definition at line 402 of file Compiler.h.
#define LLVM_ALIGNAS | ( | x | ) | alignas(x) |
LLVM_ALIGNAS Used to specify a minimum alignment for a structure or variable.
Definition at line 338 of file Compiler.h.
#define LLVM_ASSUME_ALIGNED | ( | p, | |
a | |||
) | (p) |
LLVM_ASSUME_ALIGNED Returns a pointer with an assumed alignment.
Definition at line 330 of file Compiler.h.
Referenced by llvm::support::endian::read(), llvm::support::endian::readAtBitAlignment(), llvm::support::endian::write(), and llvm::support::endian::writeAtBitAlignment().
#define LLVM_ATTRIBUTE_ALWAYS_INLINE |
LLVM_ATTRIBUTE_ALWAYS_INLINE - On compilers where we have a directive to do so, mark a method "always inline" because it is performance sensitive.
GCC 3.4 supported this but is buggy in various cases and produces unimplemented errors, just use it in GCC 4.0 and later.
Definition at line 214 of file Compiler.h.
Referenced by llvm::SmallVectorTemplateCommon< T >::begin(), llvm::StringRef::bytes(), llvm::StringSwitch< T, R >::Case(), llvm::StringSwitch< T, R >::CaseLower(), llvm::StringSwitch< T, R >::Cases(), llvm::StringSwitch< T, R >::CasesLower(), CheckAndImm(), CheckChildInteger(), CheckChildSame(), CheckChildType(), CheckCondCode(), CheckInteger(), CheckNodePredicate(), CheckOpcode(), CheckPatternPredicate(), CheckSame(), CheckType(), CheckValueType(), llvm::StringRef::consume_back(), llvm::StringRef::consume_front(), llvm::StringRef::consumeInteger(), llvm::StringRef::contains(), llvm::StringRef::contains_lower(), llvm::StringRef::copy(), llvm::StringRef::data(), llvm::SmallVectorTemplateCommon< T >::data(), llvm::StringSwitch< T, R >::Default(), llvm::StringRef::drop_back(), llvm::StringRef::drop_front(), llvm::StringRef::drop_until(), llvm::StringRef::drop_while(), llvm::StringRef::empty(), llvm::SmallVectorTemplateCommon< T >::end(), llvm::StringSwitch< T, R >::EndsWith(), llvm::StringRef::endswith(), llvm::StringSwitch< T, R >::EndsWithLower(), llvm::StringRef::equals_lower(), llvm::StringRef::find(), llvm::StringRef::find_if(), llvm::StringRef::find_last_of(), llvm::SelectionDAGISel::IsLegalToFold(), llvm::StringRef::operator std::string(), llvm::operator==(), llvm::SmallVectorTemplateCommon< T >::operator[](), llvm::StringSwitch< T, R >::StartsWith(), llvm::StringRef::startswith(), llvm::StringSwitch< T, R >::StartsWithLower(), llvm::StringRef::StringRef(), llvm::StringSwitch< T, R >::StringSwitch(), llvm::StringRef::take_back(), llvm::StringRef::take_front(), llvm::StringRef::take_until(), llvm::StringRef::take_while(), llvm::sys::toTimePoint(), llvm::sys::toTimeT(), and llvm::StringLiteral::withInnerNUL().
#define LLVM_ATTRIBUTE_DEPRECATED | ( | decl, | |
message | |||
) | decl |
Definition at line 277 of file Compiler.h.
#define LLVM_ATTRIBUTE_NOINLINE |
LLVM_ATTRIBUTE_NOINLINE - On compilers where we have a directive to do so, mark a method "not for inlining".
Definition at line 202 of file Compiler.h.
#define LLVM_ATTRIBUTE_NORETURN |
Definition at line 222 of file Compiler.h.
Referenced by llvm::Error::dynamicClassID(), llvm::HexagonMCCodeEmitter::EncodeSingleInstruction(), llvm::MCContext::hadError(), llvm::Expected< T >::operator*(), and llvm::ScopedFatalErrorHandler::~ScopedFatalErrorHandler().
#define LLVM_ATTRIBUTE_REINITIALIZES |
Definition at line 146 of file Compiler.h.
#define LLVM_ATTRIBUTE_RETURNS_NOALIAS |
LLVM_ATTRIBUTE_RETURNS_NOALIAS Used to mark a function as returning a pointer that does not alias any other valid pointer.
Definition at line 240 of file Compiler.h.
#define LLVM_ATTRIBUTE_RETURNS_NONNULL |
Definition at line 230 of file Compiler.h.
#define LLVM_ATTRIBUTE_UNUSED |
Definition at line 160 of file Compiler.h.
Referenced by llvm::LiveRangeCalc::addLiveInBlock(), assertBranchOrSelectConditionHoisted(), llvm::BuryPointer(), CC_MipsO32_FP64(), llvm::SITargetLowering::computeKnownBitsForFrameIndex(), DecodeHvxWRRegisterClass(), false::dump_node_container(), insertTrivialPHIs(), lowerUINT_TO_FP_vec(), and false::operator<<().
#define LLVM_ATTRIBUTE_USED |
Definition at line 120 of file Compiler.h.
#define LLVM_ATTRIBUTE_WEAK |
Definition at line 168 of file Compiler.h.
Referenced by llvm::jit_noop().
#define LLVM_BUILTIN_DEBUGTRAP |
LLVM_BUILTIN_DEBUGTRAP - On compilers which support it, expands to an expression which causes the program to break while running under a debugger.
Definition at line 318 of file Compiler.h.
#define LLVM_BUILTIN_TRAP *(volatile int*)0x11 = 0 |
LLVM_BUILTIN_UNREACHABLE - On compilers which support it, expands to an expression which states that it is undefined behavior for the compiler to reach this point.
Otherwise is not defined. LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression which causes the program to exit abnormally.
Definition at line 301 of file Compiler.h.
#define LLVM_DUMP_METHOD LLVM_ATTRIBUTE_NOINLINE LLVM_ATTRIBUTE_USED |
Mark debug helper function definitions like dump() that should not be stripped from debug builds.
Note that you should also surround dump() functions with if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
so they do always get stripped in release builds.
Definition at line 465 of file Compiler.h.
#define LLVM_EXTENSION |
LLVM_EXTENSION - Support compilers where we have a keyword to suppress pedantic diagnostics.
Definition at line 263 of file Compiler.h.
Referenced by bindingsErrorHandler(), LLVMContextGetDiagnosticHandler(), LLVMContextSetDiagnosticHandler(), LLVMContextSetYieldCallback(), and LLVMInstallFatalErrorHandler().
#define LLVM_FALLTHROUGH |
LLVM_FALLTHROUGH - Mark fallthrough cases in switch statements.
Definition at line 251 of file Compiler.h.
#define LLVM_GNUC_PREREQ | ( | maj, | |
min, | |||
patch | |||
) | 0 |
LLVM_GNUC_PREREQ Extend the default __GNUC_PREREQ even if glibc's features.h isn't available.
Definition at line 59 of file Compiler.h.
#define LLVM_HAS_RVALUE_REFERENCE_THIS 0 |
Does the compiler support ref-qualifiers for *this?
Sadly, this is separate from just rvalue reference support because GCC and MSVC implemented this later than everything else.
Definition at line 86 of file Compiler.h.
#define LLVM_LIBRARY_VISIBILITY |
LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked into a shared library, then the class should be private to the library and not accessible from outside it.
Can also be used to mark variables and functions, making them private to any shared library they are linked into. On PE/COFF targets, library visibility is the default, so this isn't needed.
Definition at line 108 of file Compiler.h.
#define LLVM_LIKELY | ( | EXPR | ) | (EXPR) |
Definition at line 191 of file Compiler.h.
Referenced by llvm::sys::DynamicLibrary::HandleSet::AddLibrary(), llvm::RegBankSelect::EdgeInsertPoint::canMaterialize(), llvm::caseFoldingDjbHash(), llvm::StringMapImpl::FindKey(), llvm::pdb::GlobalsStream::findRecordsByName(), llvm::json::Value::getAsArray(), llvm::json::Value::getAsBoolean(), llvm::json::Value::getAsInteger(), llvm::json::Value::getAsNull(), llvm::json::Value::getAsNumber(), llvm::json::Value::getAsObject(), llvm::json::Value::getAsString(), llvm::DenseMapBase< DenseMap< const llvm::SCEV *, const llvm::SCEV *, DenseMapInfo< const llvm::SCEV *>, llvm::detail::DenseMapPair< const llvm::SCEV *, const llvm::SCEV *> >, const llvm::SCEV *, const llvm::SCEV *, DenseMapInfo< const llvm::SCEV *>, llvm::detail::DenseMapPair< const llvm::SCEV *, const llvm::SCEV *> >::getTombstoneKey(), hashValueMapping(), llvm::json::isUTF8(), llvm::StringMapImpl::LookupBucketFor(), llvm::BinaryStreamReader::readCString(), and slotForIndex().
#define LLVM_LVALUE_FUNCTION |
Expands to '&' if ref-qualifiers for *this are supported.
This can be used to provide lvalue/rvalue overrides of member functions. The rvalue override should be guarded by LLVM_HAS_RVALUE_REFERENCE_THIS
Definition at line 96 of file Compiler.h.
#define LLVM_MEMORY_SANITIZER_BUILD 0 |
LLVM_MEMORY_SANITIZER_BUILD Whether LLVM itself is built with MemorySanitizer instrumentation.
Definition at line 391 of file Compiler.h.
#define LLVM_MSC_PREREQ | ( | version | ) | 0 |
LLVM_MSC_PREREQ Is the compiler MSVC of at least the specified version? The common
version | values to check for are:
|
Definition at line 76 of file Compiler.h.
#define LLVM_NO_SANITIZE | ( | KIND | ) |
LLVM_NO_SANITIZE Disable a particular sanitizer for a function.
Definition at line 455 of file Compiler.h.
#define LLVM_NODISCARD |
LLVM_NODISCARD - Warn if a type or return value is discarded.
Definition at line 129 of file Compiler.h.
Referenced by llvm::AttributeList::addDereferenceableOrNullParamAttr(), llvm::AttributeList::addDereferenceableParamAttr(), llvm::AttributeList::addParamAttribute(), llvm::AttributeList::addParamAttributes(), llvm::StringRef::bytes(), llvm::StringSwitch< T, R >::CasesLower(), llvm::cast(), llvm::cast_or_null(), llvm::SCEVWrapPredicate::clearFlags(), llvm::StringRef::compare(), llvm::StringRef::consume_back(), llvm::StringRef::consumeInteger(), llvm::StringRef::contains(), llvm::StringRef::contains_lower(), llvm::StringRef::copy(), llvm::StringRef::data(), llvm::StringSwitch< T, R >::Default(), llvm::StringRef::drop_back(), llvm::StringRef::drop_front(), llvm::StringRef::drop_while(), llvm::dyn_cast(), llvm::dyn_cast_or_null(), llvm::StringRef::empty(), llvm::StringRef::endswith(), llvm::StringRef::equals(), llvm::StringRef::equals_lower(), llvm::StringRef::find(), llvm::StringRef::find_first_of(), llvm::StringRef::find_if(), llvm::StringRef::find_if_not(), llvm::StringRef::find_last_of(), llvm::StringRef::front(), llvm::joinErrors(), llvm::StringRef::ltrim(), llvm::SCEVWrapPredicate::maskFlags(), llvm::StringRef::operator std::string(), llvm::AttributeSet::operator!=(), llvm::operator+=(), llvm::AttributeList::removeParamAttributes(), llvm::StringRef::rfind(), llvm::StringRef::rsplit(), llvm::StringRef::rtrim(), llvm::SCEVWrapPredicate::setFlags(), llvm::ScalarEvolution::setFlags(), llvm::StringRef::size(), llvm::StringRef::split(), llvm::StringRef::startswith(), llvm::StringRef::str(), llvm::StringRef::take_back(), llvm::StringRef::take_front(), llvm::StringRef::take_until(), llvm::StringRef::take_while(), llvm::StringRef::trim(), and llvm::detail::scope_exit< Callable >::~scope_exit().
#define LLVM_PACKED | ( | d | ) | d __attribute__((packed)) |
LLVM_PACKED Used to specify a packed structure.
LLVM_PACKED( struct A { int i; int j; int k; long long l; });
LLVM_PACKED_START struct B { int i; int j; int k; long long l; }; LLVM_PACKED_END
Definition at line 364 of file Compiler.h.
#define LLVM_PACKED_END _Pragma("pack(pop)") |
Definition at line 366 of file Compiler.h.
Referenced by llvm::coverage::CovMapHeader::getVersion().
#define LLVM_PACKED_START _Pragma("pack(push, 1)") |
Definition at line 365 of file Compiler.h.
#define LLVM_PREFETCH | ( | addr, | |
rw, | |||
locality | |||
) |
Definition at line 114 of file Compiler.h.
#define LLVM_PRETTY_FUNCTION __func__ |
LLVM_PRETTY_FUNCTION Gets a user-friendly looking function signature for the current scope using the best available method on each platform.
The exact format of the resulting string is implementation specific and non-portable, so this should only be used, for example, for logging or diagnostics.
Definition at line 480 of file Compiler.h.
#define LLVM_PTR_SIZE sizeof(void *) |
LLVM_PTR_SIZE A constant integer equivalent to the value of sizeof(void*).
Generally used in combination with LLVM_ALIGNAS or when doing computation in the preprocessor.
Definition at line 382 of file Compiler.h.
#define LLVM_READNONE |
Definition at line 177 of file Compiler.h.
Referenced by llvm::AMDGPUTargetLowering::AMDGPUTargetLowering(), llvm::AMDGPU::Waitcnt::combined(), computeDataLayout(), encodeCnt(), llvm::AMDGPU::getOperandSize(), and llvm::AMDGPU::isKernel().
#define LLVM_READONLY |
Definition at line 184 of file Compiler.h.
Referenced by fnegFoldsIntoOp(), llvm::Use::get(), llvm::Instruction::getDebugLoc(), llvm::BasicBlock::getModule(), llvm::SIInstrInfo::getOpSize(), llvm::SIInstrInfo::getRegisterInfo(), llvm::getRegSubRegPair(), llvm::Type::isSized(), llvm::maxnum(), llvm::minimum(), llvm::minnum(), llvm::neg(), llvm::EVT::compareRawBits::operator()(), and opMustUseVOP3Encoding().
#define LLVM_THREAD_LOCAL __thread |
LLVM_THREAD_LOCAL A thread-local storage specifier which can be used with globals, extern globals, and static globals.
This is essentially an extremely restricted analog to C++11's thread_local support, and uses that when available. However, it falls back on platform-specific or vendor-provided extensions when necessary. These extensions don't support many of the C++11 thread_local's features. You should only use this for PODs that you can statically initialize to some constant value. In almost all circumstances this is most appropriate for use with a pointer, integer, or small aggregation of pointers and integers.
Definition at line 504 of file Compiler.h.
#define LLVM_THREAD_SANITIZER_BUILD 0 |
LLVM_THREAD_SANITIZER_BUILD Whether LLVM itself is built with ThreadSanitizer instrumentation.
Definition at line 412 of file Compiler.h.
#define LLVM_UNLIKELY | ( | EXPR | ) | (EXPR) |
Definition at line 192 of file Compiler.h.
Referenced by llvm::Error::dynamicClassID(), llvm::SmallVectorImpl< std::pair< llvm::RelocationValueRef, llvm::RelocationEntry > >::emplace_back(), llvm::TargetFrameLowering::getStackAlignmentSkew(), llvm::DenseMapBase< DenseMap< const llvm::SCEV *, const llvm::SCEV *, DenseMapInfo< const llvm::SCEV *>, llvm::detail::DenseMapPair< const llvm::SCEV *, const llvm::SCEV *> >, const llvm::SCEV *, const llvm::SCEV *, DenseMapInfo< const llvm::SCEV *>, llvm::detail::DenseMapPair< const llvm::SCEV *, const llvm::SCEV *> >::getTombstoneKey(), gsiRecordLess(), handleMethodOverloadList(), handleOneMethod(), INITIALIZE_PASS(), llvm::codeview::GlobalTypeTableBuilder::insertRecordAs(), llvm::isASCII(), llvm::CFLAndersAAResult::FunctionInfo::mayAlias(), llvm::json::ObjectKey::ObjectKey(), llvm::Expected< T >::operator*(), llvm::BitVector::operator<<=(), llvm::BitVector::operator>>=(), llvm::SmallVectorTemplateBase< T >::push_back(), llvm::SmallVectorTemplateBase< T, true >::push_back(), llvm::StringMapImpl::RehashTable(), slotForIndex(), llvm::LocationSize::upperBound(), llvm::json::Value::Value(), and llvm::raw_ostream::write().
#define TsanHappensAfter | ( | cv | ) |
Definition at line 445 of file Compiler.h.
Referenced by llvm::call_once().
#define TsanHappensBefore | ( | cv | ) |
Definition at line 444 of file Compiler.h.
Referenced by llvm::call_once().
#define TsanIgnoreWritesBegin | ( | ) |
Definition at line 446 of file Compiler.h.
Referenced by llvm::call_once().
#define TsanIgnoreWritesEnd | ( | ) |
Definition at line 447 of file Compiler.h.
Referenced by llvm::call_once().