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llvm-project/libcxx/include/__atomic/atomic.h
Damien L-G 9965f3d337
[libc++] Improve diagnostic when violating std::atomic trivially copyable mandates (#131754) 
When attempting to instantiate `std::atomic` with a non trivially
copyable type, one gets errors from instantiating internals before the
actual static assertion that check the template parameter type
requirements.

The `verify` test for it had a `// ADDITIONAL_COMPILE_FLAGS: -Xclang
-verify-ignore-unexpected=error` directive to work around this issue.
The changes I propose enable us to drop that directive.
As I understand it, the `verify` test was misplaced so I moved it to
`test/{std -> libcxx}/atomics`.

(I ran into this while working on #121414 in which we would add another
static assertion in `__check_atomic_mandates`)
2025-04-07 15:25:45 -04:00

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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ATOMIC_ATOMIC_H
#define _LIBCPP___ATOMIC_ATOMIC_H
#include <__atomic/atomic_sync.h>
#include <__atomic/check_memory_order.h>
#include <__atomic/is_always_lock_free.h>
#include <__atomic/memory_order.h>
#include <__atomic/support.h>
#include <__config>
#include <__cstddef/ptrdiff_t.h>
#include <__memory/addressof.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_floating_point.h>
#include <__type_traits/is_function.h>
#include <__type_traits/is_integral.h>
#include <__type_traits/is_nothrow_constructible.h>
#include <__type_traits/is_same.h>
#include <__type_traits/is_trivially_copyable.h>
#include <__type_traits/remove_const.h>
#include <__type_traits/remove_pointer.h>
#include <__type_traits/remove_volatile.h>
#include <__utility/forward.h>
#include <cstring>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp, bool = is_integral<_Tp>::value && !is_same<_Tp, bool>::value>
struct __atomic_base // false
{
mutable __cxx_atomic_impl<_Tp> __a_;
using value_type = _Tp;
#if _LIBCPP_STD_VER >= 17
static constexpr bool is_always_lock_free = __libcpp_is_always_lock_free<__cxx_atomic_impl<_Tp> >::__value;
#endif
_LIBCPP_HIDE_FROM_ABI bool is_lock_free() const volatile _NOEXCEPT {
return __cxx_atomic_is_lock_free(sizeof(__cxx_atomic_impl<_Tp>));
}
_LIBCPP_HIDE_FROM_ABI bool is_lock_free() const _NOEXCEPT {
return static_cast<__atomic_base const volatile*>(this)->is_lock_free();
}
_LIBCPP_HIDE_FROM_ABI void store(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
_LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) {
std::__cxx_atomic_store(std::addressof(__a_), __d, __m);
}
_LIBCPP_HIDE_FROM_ABI void store(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT
_LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) {
std::__cxx_atomic_store(std::addressof(__a_), __d, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp load(memory_order __m = memory_order_seq_cst) const volatile _NOEXCEPT
_LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
return std::__cxx_atomic_load(std::addressof(__a_), __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp load(memory_order __m = memory_order_seq_cst) const _NOEXCEPT
_LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
return std::__cxx_atomic_load(std::addressof(__a_), __m);
}
_LIBCPP_HIDE_FROM_ABI operator _Tp() const volatile _NOEXCEPT { return load(); }
_LIBCPP_HIDE_FROM_ABI operator _Tp() const _NOEXCEPT { return load(); }
_LIBCPP_HIDE_FROM_ABI _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_exchange(std::addressof(__a_), __d, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp exchange(_Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_exchange(std::addressof(__a_), __d, __m);
}
_LIBCPP_HIDE_FROM_ABI bool
compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) volatile _NOEXCEPT
_LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
}
_LIBCPP_HIDE_FROM_ABI bool compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) _NOEXCEPT
_LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
}
_LIBCPP_HIDE_FROM_ABI bool
compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) volatile _NOEXCEPT
_LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
}
_LIBCPP_HIDE_FROM_ABI bool compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __s, memory_order __f) _NOEXCEPT
_LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __s, __f);
}
_LIBCPP_HIDE_FROM_ABI bool
compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
}
_LIBCPP_HIDE_FROM_ABI bool
compare_exchange_weak(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_compare_exchange_weak(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
}
_LIBCPP_HIDE_FROM_ABI bool
compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
}
_LIBCPP_HIDE_FROM_ABI bool
compare_exchange_strong(_Tp& __e, _Tp __d, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_compare_exchange_strong(std::addressof(__a_), std::addressof(__e), __d, __m, __m);
}
#if _LIBCPP_STD_VER >= 20
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void wait(_Tp __v, memory_order __m = memory_order_seq_cst) const
volatile _NOEXCEPT {
std::__atomic_wait(*this, __v, __m);
}
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void
wait(_Tp __v, memory_order __m = memory_order_seq_cst) const _NOEXCEPT {
std::__atomic_wait(*this, __v, __m);
}
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_one() volatile _NOEXCEPT {
std::__atomic_notify_one(*this);
}
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_one() _NOEXCEPT { std::__atomic_notify_one(*this); }
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_all() volatile _NOEXCEPT {
std::__atomic_notify_all(*this);
}
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void notify_all() _NOEXCEPT { std::__atomic_notify_all(*this); }
#endif // _LIBCPP_STD_VER >= 20
#if _LIBCPP_STD_VER >= 20
_LIBCPP_HIDE_FROM_ABI constexpr __atomic_base() noexcept(is_nothrow_default_constructible_v<_Tp>) : __a_(_Tp()) {}
#else
_LIBCPP_HIDE_FROM_ABI __atomic_base() _NOEXCEPT = default;
#endif
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __atomic_base(_Tp __d) _NOEXCEPT : __a_(__d) {}
__atomic_base(const __atomic_base&) = delete;
};
// atomic<Integral>
template <class _Tp>
struct __atomic_base<_Tp, true> : public __atomic_base<_Tp, false> {
using __base _LIBCPP_NODEBUG = __atomic_base<_Tp, false>;
using difference_type = typename __base::value_type;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 __atomic_base() _NOEXCEPT = default;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __atomic_base(_Tp __d) _NOEXCEPT : __base(__d) {}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_fetch_and(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_and(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_fetch_and(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_fetch_or(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_or(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_fetch_or(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
return std::__cxx_atomic_fetch_xor(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_xor(_Tp __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
return std::__cxx_atomic_fetch_xor(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp operator++(int) volatile _NOEXCEPT { return fetch_add(_Tp(1)); }
_LIBCPP_HIDE_FROM_ABI _Tp operator++(int) _NOEXCEPT { return fetch_add(_Tp(1)); }
_LIBCPP_HIDE_FROM_ABI _Tp operator--(int) volatile _NOEXCEPT { return fetch_sub(_Tp(1)); }
_LIBCPP_HIDE_FROM_ABI _Tp operator--(int) _NOEXCEPT { return fetch_sub(_Tp(1)); }
_LIBCPP_HIDE_FROM_ABI _Tp operator++() volatile _NOEXCEPT { return fetch_add(_Tp(1)) + _Tp(1); }
_LIBCPP_HIDE_FROM_ABI _Tp operator++() _NOEXCEPT { return fetch_add(_Tp(1)) + _Tp(1); }
_LIBCPP_HIDE_FROM_ABI _Tp operator--() volatile _NOEXCEPT { return fetch_sub(_Tp(1)) - _Tp(1); }
_LIBCPP_HIDE_FROM_ABI _Tp operator--() _NOEXCEPT { return fetch_sub(_Tp(1)) - _Tp(1); }
_LIBCPP_HIDE_FROM_ABI _Tp operator+=(_Tp __op) volatile _NOEXCEPT { return fetch_add(__op) + __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator+=(_Tp __op) _NOEXCEPT { return fetch_add(__op) + __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator-=(_Tp __op) volatile _NOEXCEPT { return fetch_sub(__op) - __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator-=(_Tp __op) _NOEXCEPT { return fetch_sub(__op) - __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator&=(_Tp __op) volatile _NOEXCEPT { return fetch_and(__op) & __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator&=(_Tp __op) _NOEXCEPT { return fetch_and(__op) & __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator|=(_Tp __op) volatile _NOEXCEPT { return fetch_or(__op) | __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator|=(_Tp __op) _NOEXCEPT { return fetch_or(__op) | __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator^=(_Tp __op) volatile _NOEXCEPT { return fetch_xor(__op) ^ __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator^=(_Tp __op) _NOEXCEPT { return fetch_xor(__op) ^ __op; }
};
// Here we need _IsIntegral because the default template argument is not enough
// e.g __atomic_base<int> is __atomic_base<int, true>, which inherits from
// __atomic_base<int, false> and the caller of the wait function is
// __atomic_base<int, false>. So specializing __atomic_base<_Tp> does not work
template <class _Tp, bool _IsIntegral>
struct __atomic_waitable_traits<__atomic_base<_Tp, _IsIntegral> > {
static _LIBCPP_HIDE_FROM_ABI _Tp __atomic_load(const __atomic_base<_Tp, _IsIntegral>& __a, memory_order __order) {
return __a.load(__order);
}
static _LIBCPP_HIDE_FROM_ABI _Tp
__atomic_load(const volatile __atomic_base<_Tp, _IsIntegral>& __this, memory_order __order) {
return __this.load(__order);
}
static _LIBCPP_HIDE_FROM_ABI const __cxx_atomic_impl<_Tp>*
__atomic_contention_address(const __atomic_base<_Tp, _IsIntegral>& __a) {
return std::addressof(__a.__a_);
}
static _LIBCPP_HIDE_FROM_ABI const volatile __cxx_atomic_impl<_Tp>*
__atomic_contention_address(const volatile __atomic_base<_Tp, _IsIntegral>& __this) {
return std::addressof(__this.__a_);
}
};
template <typename _Tp>
struct __check_atomic_mandates {
using type _LIBCPP_NODEBUG = _Tp;
static_assert(is_trivially_copyable<_Tp>::value, "std::atomic<T> requires that 'T' be a trivially copyable type");
};
template <class _Tp>
struct atomic : public __atomic_base<typename __check_atomic_mandates<_Tp>::type> {
using __base _LIBCPP_NODEBUG = __atomic_base<_Tp>;
#if _LIBCPP_STD_VER >= 20
_LIBCPP_HIDE_FROM_ABI atomic() = default;
#else
_LIBCPP_HIDE_FROM_ABI atomic() _NOEXCEPT = default;
#endif
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR atomic(_Tp __d) _NOEXCEPT : __base(__d) {}
_LIBCPP_HIDE_FROM_ABI _Tp operator=(_Tp __d) volatile _NOEXCEPT {
__base::store(__d);
return __d;
}
_LIBCPP_HIDE_FROM_ABI _Tp operator=(_Tp __d) _NOEXCEPT {
__base::store(__d);
return __d;
}
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
};
// atomic<T*>
template <class _Tp>
struct atomic<_Tp*> : public __atomic_base<_Tp*> {
using __base _LIBCPP_NODEBUG = __atomic_base<_Tp*>;
using difference_type = ptrdiff_t;
_LIBCPP_HIDE_FROM_ABI atomic() _NOEXCEPT = default;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR atomic(_Tp* __d) _NOEXCEPT : __base(__d) {}
_LIBCPP_HIDE_FROM_ABI _Tp* operator=(_Tp* __d) volatile _NOEXCEPT {
__base::store(__d);
return __d;
}
_LIBCPP_HIDE_FROM_ABI _Tp* operator=(_Tp* __d) _NOEXCEPT {
__base::store(__d);
return __d;
}
_LIBCPP_HIDE_FROM_ABI _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
// __atomic_fetch_add accepts function pointers, guard against them.
static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp* fetch_add(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
// __atomic_fetch_add accepts function pointers, guard against them.
static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
return std::__cxx_atomic_fetch_add(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT {
// __atomic_fetch_add accepts function pointers, guard against them.
static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp* fetch_sub(ptrdiff_t __op, memory_order __m = memory_order_seq_cst) _NOEXCEPT {
// __atomic_fetch_add accepts function pointers, guard against them.
static_assert(!is_function<__remove_pointer_t<_Tp> >::value, "Pointer to function isn't allowed");
return std::__cxx_atomic_fetch_sub(std::addressof(this->__a_), __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp* operator++(int) volatile _NOEXCEPT { return fetch_add(1); }
_LIBCPP_HIDE_FROM_ABI _Tp* operator++(int) _NOEXCEPT { return fetch_add(1); }
_LIBCPP_HIDE_FROM_ABI _Tp* operator--(int) volatile _NOEXCEPT { return fetch_sub(1); }
_LIBCPP_HIDE_FROM_ABI _Tp* operator--(int) _NOEXCEPT { return fetch_sub(1); }
_LIBCPP_HIDE_FROM_ABI _Tp* operator++() volatile _NOEXCEPT { return fetch_add(1) + 1; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator++() _NOEXCEPT { return fetch_add(1) + 1; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator--() volatile _NOEXCEPT { return fetch_sub(1) - 1; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator--() _NOEXCEPT { return fetch_sub(1) - 1; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator+=(ptrdiff_t __op) volatile _NOEXCEPT { return fetch_add(__op) + __op; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator+=(ptrdiff_t __op) _NOEXCEPT { return fetch_add(__op) + __op; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator-=(ptrdiff_t __op) volatile _NOEXCEPT { return fetch_sub(__op) - __op; }
_LIBCPP_HIDE_FROM_ABI _Tp* operator-=(ptrdiff_t __op) _NOEXCEPT { return fetch_sub(__op) - __op; }
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
};
template <class _Tp>
struct __atomic_waitable_traits<atomic<_Tp> > : __atomic_waitable_traits<__atomic_base<_Tp> > {};
#if _LIBCPP_STD_VER >= 20
template <class _Tp>
requires is_floating_point_v<_Tp>
struct atomic<_Tp> : __atomic_base<_Tp> {
private:
_LIBCPP_HIDE_FROM_ABI static constexpr bool __is_fp80_long_double() {
// Only x87-fp80 long double has 64-bit mantissa
return __LDBL_MANT_DIG__ == 64 && std::is_same_v<_Tp, long double>;
}
_LIBCPP_HIDE_FROM_ABI static constexpr bool __has_rmw_builtin() {
# ifndef _LIBCPP_COMPILER_CLANG_BASED
return false;
# else
// The builtin __cxx_atomic_fetch_add errors during compilation for
// long double on platforms with fp80 format.
// For more details, see
// lib/Sema/SemaChecking.cpp function IsAllowedValueType
// LLVM Parser does not allow atomicrmw with x86_fp80 type.
// if (ValType->isSpecificBuiltinType(BuiltinType::LongDouble) &&
// &Context.getTargetInfo().getLongDoubleFormat() ==
// &llvm::APFloat::x87DoubleExtended())
// For more info
// https://github.com/llvm/llvm-project/issues/68602
// https://reviews.llvm.org/D53965
return !__is_fp80_long_double();
# endif
}
template <class _This, class _Operation, class _BuiltinOp>
_LIBCPP_HIDE_FROM_ABI static _Tp
__rmw_op(_This&& __self, _Tp __operand, memory_order __m, _Operation __operation, _BuiltinOp __builtin_op) {
if constexpr (__has_rmw_builtin()) {
return __builtin_op(std::addressof(std::forward<_This>(__self).__a_), __operand, __m);
} else {
_Tp __old = __self.load(memory_order_relaxed);
_Tp __new = __operation(__old, __operand);
while (!__self.compare_exchange_weak(__old, __new, __m, memory_order_relaxed)) {
# ifdef _LIBCPP_COMPILER_CLANG_BASED
if constexpr (__is_fp80_long_double()) {
// https://github.com/llvm/llvm-project/issues/47978
// clang bug: __old is not updated on failure for atomic<long double>::compare_exchange_weak
// Note __old = __self.load(memory_order_relaxed) will not work
std::__cxx_atomic_load_inplace(std::addressof(__self.__a_), std::addressof(__old), memory_order_relaxed);
}
# endif
__new = __operation(__old, __operand);
}
return __old;
}
}
template <class _This>
_LIBCPP_HIDE_FROM_ABI static _Tp __fetch_add(_This&& __self, _Tp __operand, memory_order __m) {
auto __builtin_op = [](auto __a, auto __builtin_operand, auto __order) {
return std::__cxx_atomic_fetch_add(__a, __builtin_operand, __order);
};
auto __plus = [](auto __a, auto __b) { return __a + __b; };
return __rmw_op(std::forward<_This>(__self), __operand, __m, __plus, __builtin_op);
}
template <class _This>
_LIBCPP_HIDE_FROM_ABI static _Tp __fetch_sub(_This&& __self, _Tp __operand, memory_order __m) {
auto __builtin_op = [](auto __a, auto __builtin_operand, auto __order) {
return std::__cxx_atomic_fetch_sub(__a, __builtin_operand, __order);
};
auto __minus = [](auto __a, auto __b) { return __a - __b; };
return __rmw_op(std::forward<_This>(__self), __operand, __m, __minus, __builtin_op);
}
public:
using __base _LIBCPP_NODEBUG = __atomic_base<_Tp>;
using value_type = _Tp;
using difference_type = value_type;
_LIBCPP_HIDE_FROM_ABI constexpr atomic() noexcept = default;
_LIBCPP_HIDE_FROM_ABI constexpr atomic(_Tp __d) noexcept : __base(__d) {}
atomic(const atomic&) = delete;
atomic& operator=(const atomic&) = delete;
atomic& operator=(const atomic&) volatile = delete;
_LIBCPP_HIDE_FROM_ABI _Tp operator=(_Tp __d) volatile noexcept
requires __base::is_always_lock_free
{
__base::store(__d);
return __d;
}
_LIBCPP_HIDE_FROM_ABI _Tp operator=(_Tp __d) noexcept {
__base::store(__d);
return __d;
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) volatile noexcept
requires __base::is_always_lock_free
{
return __fetch_add(*this, __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_add(_Tp __op, memory_order __m = memory_order_seq_cst) noexcept {
return __fetch_add(*this, __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) volatile noexcept
requires __base::is_always_lock_free
{
return __fetch_sub(*this, __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp fetch_sub(_Tp __op, memory_order __m = memory_order_seq_cst) noexcept {
return __fetch_sub(*this, __op, __m);
}
_LIBCPP_HIDE_FROM_ABI _Tp operator+=(_Tp __op) volatile noexcept
requires __base::is_always_lock_free
{
return fetch_add(__op) + __op;
}
_LIBCPP_HIDE_FROM_ABI _Tp operator+=(_Tp __op) noexcept { return fetch_add(__op) + __op; }
_LIBCPP_HIDE_FROM_ABI _Tp operator-=(_Tp __op) volatile noexcept
requires __base::is_always_lock_free
{
return fetch_sub(__op) - __op;
}
_LIBCPP_HIDE_FROM_ABI _Tp operator-=(_Tp __op) noexcept { return fetch_sub(__op) - __op; }
};
#endif // _LIBCPP_STD_VER >= 20
// atomic_is_lock_free
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_is_lock_free(const volatile atomic<_Tp>* __o) _NOEXCEPT {
return __o->is_lock_free();
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_is_lock_free(const atomic<_Tp>* __o) _NOEXCEPT {
return __o->is_lock_free();
}
// atomic_init
template <class _Tp>
_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI void
atomic_init(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
std::__cxx_atomic_init(std::addressof(__o->__a_), __d);
}
template <class _Tp>
_LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI void
atomic_init(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
std::__cxx_atomic_init(std::addressof(__o->__a_), __d);
}
// atomic_store
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void atomic_store(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
__o->store(__d);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void atomic_store(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
__o->store(__d);
}
// atomic_store_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void
atomic_store_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
_LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) {
__o->store(__d, __m);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void
atomic_store_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT
_LIBCPP_CHECK_STORE_MEMORY_ORDER(__m) {
__o->store(__d, __m);
}
// atomic_load
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_load(const volatile atomic<_Tp>* __o) _NOEXCEPT {
return __o->load();
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_load(const atomic<_Tp>* __o) _NOEXCEPT {
return __o->load();
}
// atomic_load_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_load_explicit(const volatile atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
_LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
return __o->load(__m);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_load_explicit(const atomic<_Tp>* __o, memory_order __m) _NOEXCEPT
_LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
return __o->load(__m);
}
// atomic_exchange
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_exchange(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
return __o->exchange(__d);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_exchange(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
return __o->exchange(__d);
}
// atomic_exchange_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_exchange_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT {
return __o->exchange(__d, __m);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_exchange_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __d, memory_order __m) _NOEXCEPT {
return __o->exchange(__d, __m);
}
// atomic_compare_exchange_weak
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_weak(
volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
return __o->compare_exchange_weak(*__e, __d);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_weak(
atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
return __o->compare_exchange_weak(*__e, __d);
}
// atomic_compare_exchange_strong
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_strong(
volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
return __o->compare_exchange_strong(*__e, __d);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_strong(
atomic<_Tp>* __o, typename atomic<_Tp>::value_type* __e, typename atomic<_Tp>::value_type __d) _NOEXCEPT {
return __o->compare_exchange_strong(*__e, __d);
}
// atomic_compare_exchange_weak_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_weak_explicit(
volatile atomic<_Tp>* __o,
typename atomic<_Tp>::value_type* __e,
typename atomic<_Tp>::value_type __d,
memory_order __s,
memory_order __f) _NOEXCEPT _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return __o->compare_exchange_weak(*__e, __d, __s, __f);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_weak_explicit(
atomic<_Tp>* __o,
typename atomic<_Tp>::value_type* __e,
typename atomic<_Tp>::value_type __d,
memory_order __s,
memory_order __f) _NOEXCEPT _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return __o->compare_exchange_weak(*__e, __d, __s, __f);
}
// atomic_compare_exchange_strong_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_strong_explicit(
volatile atomic<_Tp>* __o,
typename atomic<_Tp>::value_type* __e,
typename atomic<_Tp>::value_type __d,
memory_order __s,
memory_order __f) _NOEXCEPT _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return __o->compare_exchange_strong(*__e, __d, __s, __f);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool atomic_compare_exchange_strong_explicit(
atomic<_Tp>* __o,
typename atomic<_Tp>::value_type* __e,
typename atomic<_Tp>::value_type __d,
memory_order __s,
memory_order __f) _NOEXCEPT _LIBCPP_CHECK_EXCHANGE_MEMORY_ORDER(__s, __f) {
return __o->compare_exchange_strong(*__e, __d, __s, __f);
}
#if _LIBCPP_STD_VER >= 20
// atomic_wait
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void
atomic_wait(const volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __v) _NOEXCEPT {
return __o->wait(__v);
}
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void
atomic_wait(const atomic<_Tp>* __o, typename atomic<_Tp>::value_type __v) _NOEXCEPT {
return __o->wait(__v);
}
// atomic_wait_explicit
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void
atomic_wait_explicit(const volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __v, memory_order __m) _NOEXCEPT
_LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
return __o->wait(__v, __m);
}
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void
atomic_wait_explicit(const atomic<_Tp>* __o, typename atomic<_Tp>::value_type __v, memory_order __m) _NOEXCEPT
_LIBCPP_CHECK_LOAD_MEMORY_ORDER(__m) {
return __o->wait(__v, __m);
}
// atomic_notify_one
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void atomic_notify_one(volatile atomic<_Tp>* __o) _NOEXCEPT {
__o->notify_one();
}
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void atomic_notify_one(atomic<_Tp>* __o) _NOEXCEPT {
__o->notify_one();
}
// atomic_notify_all
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void atomic_notify_all(volatile atomic<_Tp>* __o) _NOEXCEPT {
__o->notify_all();
}
template <class _Tp>
_LIBCPP_AVAILABILITY_SYNC _LIBCPP_HIDE_FROM_ABI void atomic_notify_all(atomic<_Tp>* __o) _NOEXCEPT {
__o->notify_all();
}
#endif // _LIBCPP_STD_VER >= 20
// atomic_fetch_add
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_add(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT {
return __o->fetch_add(__op);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_add(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT {
return __o->fetch_add(__op);
}
// atomic_fetch_add_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_add_explicit(
volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_add(__op, __m);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_add_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_add(__op, __m);
}
// atomic_fetch_sub
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_sub(volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT {
return __o->fetch_sub(__op);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_sub(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op) _NOEXCEPT {
return __o->fetch_sub(__op);
}
// atomic_fetch_sub_explicit
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_sub_explicit(
volatile atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_sub(__op, __m);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_sub_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::difference_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_sub(__op, __m);
}
// atomic_fetch_and
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_and(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT {
return __o->fetch_and(__op);
}
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_and(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT {
return __o->fetch_and(__op);
}
// atomic_fetch_and_explicit
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_and_explicit(
volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_and(__op, __m);
}
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_and_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_and(__op, __m);
}
// atomic_fetch_or
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_or(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT {
return __o->fetch_or(__op);
}
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_or(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT {
return __o->fetch_or(__op);
}
// atomic_fetch_or_explicit
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_or_explicit(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_or(__op, __m);
}
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_or_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_or(__op, __m);
}
// atomic_fetch_xor
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_xor(volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT {
return __o->fetch_xor(__op);
}
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_xor(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op) _NOEXCEPT {
return __o->fetch_xor(__op);
}
// atomic_fetch_xor_explicit
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp atomic_fetch_xor_explicit(
volatile atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_xor(__op, __m);
}
template <class _Tp, __enable_if_t<is_integral<_Tp>::value && !is_same<_Tp, bool>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Tp
atomic_fetch_xor_explicit(atomic<_Tp>* __o, typename atomic<_Tp>::value_type __op, memory_order __m) _NOEXCEPT {
return __o->fetch_xor(__op, __m);
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ATOMIC_ATOMIC_H
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