//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// XFAIL: !has-64-bit-atomics
// <atomic>
//
// template <class T>
// class atomic;
//
// static constexpr bool is_always_lock_free;
// Ignore diagnostic about vector types changing the ABI on some targets, since
// that is irrelevant for this test.
// ADDITIONAL_COMPILE_FLAGS: -Wno-psabi
#include <atomic>
#include <cassert>
#include <concepts>
#include <cstddef>
#include "test_macros.h"
#include "atomic_helpers.h"
template <typename T>
void check_always_lock_free(std::atomic<T> const& a) {
using InfoT = LockFreeStatusInfo<T>;
constexpr auto is_always_lock_free = std::atomic<T>::is_always_lock_free;
ASSERT_SAME_TYPE(decltype(is_always_lock_free), bool const);
// If we know the status of T for sure, validate the exact result of the function.
if constexpr (InfoT::status_known) {
constexpr LockFreeStatus known_status = InfoT::value;
if constexpr (known_status == LockFreeStatus::always) {
static_assert(is_always_lock_free, "is_always_lock_free is inconsistent with known lock-free status");
assert(a.is_lock_free() && "is_lock_free() is inconsistent with known lock-free status");
} else if constexpr (known_status == LockFreeStatus::never) {
static_assert(!is_always_lock_free, "is_always_lock_free is inconsistent with known lock-free status");
assert(!a.is_lock_free() && "is_lock_free() is inconsistent with known lock-free status");
} else {
assert(a.is_lock_free() || !a.is_lock_free()); // This is kinda dumb, but we might as well call the function once.
}
}
// In all cases, also sanity-check it based on the implication always-lock-free => lock-free.
if (is_always_lock_free) {
auto is_lock_free = a.is_lock_free();
ASSERT_SAME_TYPE(decltype(is_always_lock_free), bool const);
assert(is_lock_free);
}
ASSERT_NOEXCEPT(a.is_lock_free());
}
#define CHECK_ALWAYS_LOCK_FREE(T) \
do { \
typedef T type; \
type obj{}; \
std::atomic<type> a(obj); \
check_always_lock_free(a); \
} while (0)
void test() {
char c = 'x';
check_always_lock_free(std::atomic<char>(c));
int i = 0;
check_always_lock_free(std::atomic<int>(i));
float f = 0.f;
check_always_lock_free(std::atomic<float>(f));
int* p = &i;
check_always_lock_free(std::atomic<int*>(p));
CHECK_ALWAYS_LOCK_FREE(bool);
CHECK_ALWAYS_LOCK_FREE(char);
CHECK_ALWAYS_LOCK_FREE(signed char);
CHECK_ALWAYS_LOCK_FREE(unsigned char);
#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
CHECK_ALWAYS_LOCK_FREE(char8_t);
#endif
CHECK_ALWAYS_LOCK_FREE(char16_t);
CHECK_ALWAYS_LOCK_FREE(char32_t);
CHECK_ALWAYS_LOCK_FREE(wchar_t);
CHECK_ALWAYS_LOCK_FREE(short);
CHECK_ALWAYS_LOCK_FREE(unsigned short);
CHECK_ALWAYS_LOCK_FREE(int);
CHECK_ALWAYS_LOCK_FREE(unsigned int);
CHECK_ALWAYS_LOCK_FREE(long);
CHECK_ALWAYS_LOCK_FREE(unsigned long);
CHECK_ALWAYS_LOCK_FREE(long long);
CHECK_ALWAYS_LOCK_FREE(unsigned long long);
CHECK_ALWAYS_LOCK_FREE(std::nullptr_t);
CHECK_ALWAYS_LOCK_FREE(void*);
CHECK_ALWAYS_LOCK_FREE(float);
CHECK_ALWAYS_LOCK_FREE(double);
CHECK_ALWAYS_LOCK_FREE(long double);
#if __has_attribute(vector_size) && defined(_LIBCPP_VERSION)
CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(1 * sizeof(int)))));
CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(2 * sizeof(int)))));
CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(4 * sizeof(int)))));
CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(16 * sizeof(int)))));
CHECK_ALWAYS_LOCK_FREE(int __attribute__((vector_size(32 * sizeof(int)))));
CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(1 * sizeof(float)))));
CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(2 * sizeof(float)))));
CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(4 * sizeof(float)))));
CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(16 * sizeof(float)))));
CHECK_ALWAYS_LOCK_FREE(float __attribute__((vector_size(32 * sizeof(float)))));
CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(1 * sizeof(double)))));
CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(2 * sizeof(double)))));
CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(4 * sizeof(double)))));
CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(16 * sizeof(double)))));
CHECK_ALWAYS_LOCK_FREE(double __attribute__((vector_size(32 * sizeof(double)))));
#endif // __has_attribute(vector_size) && defined(_LIBCPP_VERSION)
CHECK_ALWAYS_LOCK_FREE(struct Empty{});
CHECK_ALWAYS_LOCK_FREE(struct OneInt { int i; });
CHECK_ALWAYS_LOCK_FREE(struct IntArr2 { int i[2]; });
CHECK_ALWAYS_LOCK_FREE(struct FloatArr3 { float i[3]; });
CHECK_ALWAYS_LOCK_FREE(struct LLIArr2 { long long int i[2]; });
CHECK_ALWAYS_LOCK_FREE(struct LLIArr4 { long long int i[4]; });
CHECK_ALWAYS_LOCK_FREE(struct LLIArr8 { long long int i[8]; });
CHECK_ALWAYS_LOCK_FREE(struct LLIArr16 { long long int i[16]; });
CHECK_ALWAYS_LOCK_FREE(struct Padding {
char c; /* padding */
long long int i;
});
CHECK_ALWAYS_LOCK_FREE(union IntFloat {
int i;
float f;
});
CHECK_ALWAYS_LOCK_FREE(enum class CharEnumClass : char{foo});
// C macro and static constexpr must be consistent.
enum class CharEnumClass : char { foo };
static_assert(std::atomic<bool>::is_always_lock_free == (2 == ATOMIC_BOOL_LOCK_FREE), "");
static_assert(std::atomic<char>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE), "");
static_assert(std::atomic<CharEnumClass>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE), "");
static_assert(std::atomic<signed char>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE), "");
static_assert(std::atomic<unsigned char>::is_always_lock_free == (2 == ATOMIC_CHAR_LOCK_FREE), "");
#if TEST_STD_VER > 17 && defined(__cpp_char8_t)
static_assert(std::atomic<char8_t>::is_always_lock_free == (2 == ATOMIC_CHAR8_T_LOCK_FREE), "");
#endif
static_assert(std::atomic<char16_t>::is_always_lock_free == (2 == ATOMIC_CHAR16_T_LOCK_FREE), "");
static_assert(std::atomic<char32_t>::is_always_lock_free == (2 == ATOMIC_CHAR32_T_LOCK_FREE), "");
static_assert(std::atomic<wchar_t>::is_always_lock_free == (2 == ATOMIC_WCHAR_T_LOCK_FREE), "");
static_assert(std::atomic<short>::is_always_lock_free == (2 == ATOMIC_SHORT_LOCK_FREE), "");
static_assert(std::atomic<unsigned short>::is_always_lock_free == (2 == ATOMIC_SHORT_LOCK_FREE), "");
static_assert(std::atomic<int>::is_always_lock_free == (2 == ATOMIC_INT_LOCK_FREE), "");
static_assert(std::atomic<unsigned int>::is_always_lock_free == (2 == ATOMIC_INT_LOCK_FREE), "");
static_assert(std::atomic<long>::is_always_lock_free == (2 == ATOMIC_LONG_LOCK_FREE), "");
static_assert(std::atomic<unsigned long>::is_always_lock_free == (2 == ATOMIC_LONG_LOCK_FREE), "");
static_assert(std::atomic<long long>::is_always_lock_free == (2 == ATOMIC_LLONG_LOCK_FREE), "");
static_assert(std::atomic<unsigned long long>::is_always_lock_free == (2 == ATOMIC_LLONG_LOCK_FREE), "");
static_assert(std::atomic<void*>::is_always_lock_free == (2 == ATOMIC_POINTER_LOCK_FREE), "");
static_assert(std::atomic<std::nullptr_t>::is_always_lock_free == (2 == ATOMIC_POINTER_LOCK_FREE), "");
#if TEST_STD_VER >= 20
static_assert(std::atomic_signed_lock_free::is_always_lock_free, "");
static_assert(std::atomic_unsigned_lock_free::is_always_lock_free, "");
#endif
}
int main(int, char**) {
test();
return 0;
}
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