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llvm-project/libcxx/include/__atomic/support/c11.h
Nikolas Klauser d8d561a388
[libc++][NFC] Remove _LIBCPP_DISABLE_EXTENSION_WARNINGS (#133693) 
We only use `_LIBCPP_DISABLE_EXTENSION_WARNINGS` in a single place while
we use extensions all over the place. The warnings are already disabled,
since libc++'s headers are system headers, so this shouldn't be in any
way observable by users.
2025-04-02 15:40:00 +02:00

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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_SUPPORT_C11_H
#define _LIBCPP___ATOMIC_SUPPORT_C11_H
#include <__atomic/memory_order.h>
#include <__config>
#include <__cstddef/ptrdiff_t.h>
#include <__memory/addressof.h>
#include <__type_traits/remove_const.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
//
// This file implements support for C11-style atomics
//
_LIBCPP_BEGIN_NAMESPACE_STD
template <typename _Tp>
struct __cxx_atomic_base_impl {
_LIBCPP_HIDE_FROM_ABI
#ifndef _LIBCPP_CXX03_LANG
__cxx_atomic_base_impl() _NOEXCEPT = default;
#else
__cxx_atomic_base_impl() _NOEXCEPT : __a_value() {
}
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_CONSTEXPR explicit __cxx_atomic_base_impl(_Tp __value) _NOEXCEPT : __a_value(__value) {}
_Atomic(_Tp) __a_value;
};
#define __cxx_atomic_is_lock_free(__s) __c11_atomic_is_lock_free(__s)
_LIBCPP_HIDE_FROM_ABI inline void __cxx_atomic_thread_fence(memory_order __order) _NOEXCEPT {
__c11_atomic_thread_fence(static_cast<__memory_order_underlying_t>(__order));
}
_LIBCPP_HIDE_FROM_ABI inline void __cxx_atomic_signal_fence(memory_order __order) _NOEXCEPT {
__c11_atomic_signal_fence(static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val) _NOEXCEPT {
__c11_atomic_init(std::addressof(__a->__a_value), __val);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void __cxx_atomic_init(__cxx_atomic_base_impl<_Tp>* __a, _Tp __val) _NOEXCEPT {
__c11_atomic_init(std::addressof(__a->__a_value), __val);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void
__cxx_atomic_store(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __val, memory_order __order) _NOEXCEPT {
__c11_atomic_store(std::addressof(__a->__a_value), __val, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void
__cxx_atomic_store(__cxx_atomic_base_impl<_Tp>* __a, _Tp __val, memory_order __order) _NOEXCEPT {
__c11_atomic_store(std::addressof(__a->__a_value), __val, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const volatile* __a, memory_order __order) _NOEXCEPT {
using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
return __c11_atomic_load(
const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp __cxx_atomic_load(__cxx_atomic_base_impl<_Tp> const* __a, memory_order __order) _NOEXCEPT {
using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
return __c11_atomic_load(
const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void
__cxx_atomic_load_inplace(__cxx_atomic_base_impl<_Tp> const volatile* __a, _Tp* __dst, memory_order __order) _NOEXCEPT {
using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
*__dst = __c11_atomic_load(
const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI void
__cxx_atomic_load_inplace(__cxx_atomic_base_impl<_Tp> const* __a, _Tp* __dst, memory_order __order) _NOEXCEPT {
using __ptr_type = __remove_const_t<decltype(__a->__a_value)>*;
*__dst = __c11_atomic_load(
const_cast<__ptr_type>(std::addressof(__a->__a_value)), static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __value, memory_order __order) _NOEXCEPT {
return __c11_atomic_exchange(
std::addressof(__a->__a_value), __value, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_exchange(__cxx_atomic_base_impl<_Tp>* __a, _Tp __value, memory_order __order) _NOEXCEPT {
return __c11_atomic_exchange(
std::addressof(__a->__a_value), __value, static_cast<__memory_order_underlying_t>(__order));
}
_LIBCPP_HIDE_FROM_ABI inline _LIBCPP_CONSTEXPR memory_order __to_failure_order(memory_order __order) {
// Avoid switch statement to make this a constexpr.
return __order == memory_order_release
? memory_order_relaxed
: (__order == memory_order_acq_rel ? memory_order_acquire : __order);
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_compare_exchange_strong(
__cxx_atomic_base_impl<_Tp> volatile* __a,
_Tp* __expected,
_Tp __value,
memory_order __success,
memory_order __failure) _NOEXCEPT {
return __c11_atomic_compare_exchange_strong(
std::addressof(__a->__a_value),
__expected,
__value,
static_cast<__memory_order_underlying_t>(__success),
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_compare_exchange_strong(
__cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure)
_NOEXCEPT {
return __c11_atomic_compare_exchange_strong(
std::addressof(__a->__a_value),
__expected,
__value,
static_cast<__memory_order_underlying_t>(__success),
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_compare_exchange_weak(
__cxx_atomic_base_impl<_Tp> volatile* __a,
_Tp* __expected,
_Tp __value,
memory_order __success,
memory_order __failure) _NOEXCEPT {
return __c11_atomic_compare_exchange_weak(
std::addressof(__a->__a_value),
__expected,
__value,
static_cast<__memory_order_underlying_t>(__success),
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI bool __cxx_atomic_compare_exchange_weak(
__cxx_atomic_base_impl<_Tp>* __a, _Tp* __expected, _Tp __value, memory_order __success, memory_order __failure)
_NOEXCEPT {
return __c11_atomic_compare_exchange_weak(
std::addressof(__a->__a_value),
__expected,
__value,
static_cast<__memory_order_underlying_t>(__success),
static_cast<__memory_order_underlying_t>(__to_failure_order(__failure)));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_add(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp>* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_add(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp*
__cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_add(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp*
__cxx_atomic_fetch_add(__cxx_atomic_base_impl<_Tp*>* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_add(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_sub(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp>* __a, _Tp __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_sub(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp*
__cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*> volatile* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_sub(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp*
__cxx_atomic_fetch_sub(__cxx_atomic_base_impl<_Tp*>* __a, ptrdiff_t __delta, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_sub(
std::addressof(__a->__a_value), __delta, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_and(
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_and(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_and(
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_or(
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_or(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_or(
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp> volatile* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_xor(
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
}
template <class _Tp>
_LIBCPP_HIDE_FROM_ABI _Tp
__cxx_atomic_fetch_xor(__cxx_atomic_base_impl<_Tp>* __a, _Tp __pattern, memory_order __order) _NOEXCEPT {
return __c11_atomic_fetch_xor(
std::addressof(__a->__a_value), __pattern, static_cast<__memory_order_underlying_t>(__order));
}
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ATOMIC_SUPPORT_C11_H
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