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139 lines
6.7 KiB
C++
139 lines
6.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads, c++98, c++03, c++11, c++14
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// <atomic>
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// static constexpr bool is_always_lock_free;
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#include <atomic>
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#include <cassert>
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#if !defined(__cpp_lib_atomic_is_always_lock_free)
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# error Feature test macro missing.
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#endif
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template <typename T> void checkAlwaysLockFree() {
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if (std::atomic<T>::is_always_lock_free)
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assert(std::atomic<T>().is_lock_free());
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}
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// FIXME: This separate test is needed to work around llvm.org/PR31864
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// which causes ATOMIC_LLONG_LOCK_FREE to be defined as '1' in 32-bit builds
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// even though __atomic_always_lock_free returns true for the same type.
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constexpr bool NeedWorkaroundForPR31864 =
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#if defined(__clang__)
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(sizeof(void*) == 4); // Needed on 32 bit builds
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#else
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false;
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#endif
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template <bool Disable = NeedWorkaroundForPR31864,
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std::enable_if_t<!Disable>* = nullptr,
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class LLong = long long,
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class ULLong = unsigned long long>
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void checkLongLongTypes() {
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static_assert(std::atomic<LLong>::is_always_lock_free == (2 == ATOMIC_LLONG_LOCK_FREE));
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static_assert(std::atomic<ULLong>::is_always_lock_free == (2 == ATOMIC_LLONG_LOCK_FREE));
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}
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// Used to make the calls to __atomic_always_lock_free dependent on a template
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// parameter.
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template <class T> constexpr size_t getSizeOf() { return sizeof(T); }
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template <bool Enable = NeedWorkaroundForPR31864,
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std::enable_if_t<Enable>* = nullptr,
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class LLong = long long,
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class ULLong = unsigned long long>
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void checkLongLongTypes() {
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constexpr bool ExpectLockFree = __atomic_always_lock_free(getSizeOf<LLong>(), 0);
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static_assert(std::atomic<LLong>::is_always_lock_free == ExpectLockFree, "");
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static_assert(std::atomic<ULLong>::is_always_lock_free == ExpectLockFree, "");
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static_assert((0 != ATOMIC_LLONG_LOCK_FREE) == ExpectLockFree, "");
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}
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void run()
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{
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// structs and unions can't be defined in the template invocation.
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// Work around this with a typedef.
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#define CHECK_ALWAYS_LOCK_FREE(T) \
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do { \
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typedef T type; \
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checkAlwaysLockFree<type>(); \
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} while (0)
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CHECK_ALWAYS_LOCK_FREE(bool);
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CHECK_ALWAYS_LOCK_FREE(char);
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CHECK_ALWAYS_LOCK_FREE(signed char);
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CHECK_ALWAYS_LOCK_FREE(unsigned char);
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CHECK_ALWAYS_LOCK_FREE(char16_t);
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CHECK_ALWAYS_LOCK_FREE(char32_t);
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CHECK_ALWAYS_LOCK_FREE(wchar_t);
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CHECK_ALWAYS_LOCK_FREE(short);
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CHECK_ALWAYS_LOCK_FREE(unsigned short);
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CHECK_ALWAYS_LOCK_FREE(int);
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CHECK_ALWAYS_LOCK_FREE(unsigned int);
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CHECK_ALWAYS_LOCK_FREE(long);
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CHECK_ALWAYS_LOCK_FREE(unsigned long);
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CHECK_ALWAYS_LOCK_FREE(long long);
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CHECK_ALWAYS_LOCK_FREE(unsigned long long);
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CHECK_ALWAYS_LOCK_FREE(std::nullptr_t);
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CHECK_ALWAYS_LOCK_FREE(void*);
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CHECK_ALWAYS_LOCK_FREE(float);
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CHECK_ALWAYS_LOCK_FREE(double);
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CHECK_ALWAYS_LOCK_FREE(long double);
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#if __has_attribute(vector_size) && defined(_LIBCPP_VERSION)
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CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(1 * sizeof(int)))));
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CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(2 * sizeof(int)))));
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CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(4 * sizeof(int)))));
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CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(16 * sizeof(int)))));
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CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(32 * sizeof(int)))));
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CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(1 * sizeof(float)))));
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CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(2 * sizeof(float)))));
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CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(4 * sizeof(float)))));
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CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(16 * sizeof(float)))));
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CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(32 * sizeof(float)))));
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CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(1 * sizeof(double)))));
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CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(2 * sizeof(double)))));
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CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(4 * sizeof(double)))));
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CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(16 * sizeof(double)))));
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CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(32 * sizeof(double)))));
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#endif // __has_attribute(vector_size) && defined(_LIBCPP_VERSION)
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CHECK_ALWAYS_LOCK_FREE(struct Empty {});
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CHECK_ALWAYS_LOCK_FREE(struct OneInt { int i; });
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CHECK_ALWAYS_LOCK_FREE(struct IntArr2 { int i[2]; });
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CHECK_ALWAYS_LOCK_FREE(struct LLIArr2 { long long int i[2]; });
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CHECK_ALWAYS_LOCK_FREE(struct LLIArr4 { long long int i[4]; });
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CHECK_ALWAYS_LOCK_FREE(struct LLIArr8 { long long int i[8]; });
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CHECK_ALWAYS_LOCK_FREE(struct LLIArr16 { long long int i[16]; });
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CHECK_ALWAYS_LOCK_FREE(struct Padding { char c; /* padding */ long long int i; });
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CHECK_ALWAYS_LOCK_FREE(union IntFloat { int i; float f; });
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// C macro and static constexpr must be consistent.
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static_assert(std::atomic<bool>::is_always_lock_free == (2 == ATOMIC_BOOL_LOCK_FREE));
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static_assert(std::atomic<char>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE));
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static_assert(std::atomic<signed char>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE));
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static_assert(std::atomic<unsigned char>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE));
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static_assert(std::atomic<char16_t>::is_always_lock_free == (2 == ATOMIC_CHAR16_T_LOCK_FREE));
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static_assert(std::atomic<char32_t>::is_always_lock_free == (2 == ATOMIC_CHAR32_T_LOCK_FREE));
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static_assert(std::atomic<wchar_t>::is_always_lock_free == (2 == ATOMIC_WCHAR_T_LOCK_FREE));
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static_assert(std::atomic<short>::is_always_lock_free == (2 == ATOMIC_SHORT_LOCK_FREE));
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static_assert(std::atomic<unsigned short>::is_always_lock_free == (2 == ATOMIC_SHORT_LOCK_FREE));
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static_assert(std::atomic<int>::is_always_lock_free == (2 == ATOMIC_INT_LOCK_FREE));
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static_assert(std::atomic<unsigned int>::is_always_lock_free == (2 == ATOMIC_INT_LOCK_FREE));
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static_assert(std::atomic<long>::is_always_lock_free == (2 == ATOMIC_LONG_LOCK_FREE));
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static_assert(std::atomic<unsigned long>::is_always_lock_free == (2 == ATOMIC_LONG_LOCK_FREE));
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checkLongLongTypes();
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static_assert(std::atomic<void*>::is_always_lock_free == (2 == ATOMIC_POINTER_LOCK_FREE));
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static_assert(std::atomic<std::nullptr_t>::is_always_lock_free == (2 == ATOMIC_POINTER_LOCK_FREE));
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}
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int main() { run(); }
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