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/////////////////////////////////////////////////////////////////////////////////
// Copyright (c) Electronic Arts Inc. All rights reserved.
/////////////////////////////////////////////////////////////////////////////////
#ifndef EASTL_ATOMIC_INTERNAL_H
#define EASTL_ATOMIC_INTERNAL_H
#if defined(EA_PRAGMA_ONCE_SUPPORTED)
#pragma once
#endif
#include <EASTL/internal/config.h>
#include <EASTL/internal/move_help.h>
#include <EASTL/internal/memory_base.h>
#include <EASTL/type_traits.h>
#include "atomic_macros.h"
#include "atomic_casts.h"
#include "atomic_memory_order.h"
#include "atomic_asserts.h"
#include "atomic_size_aligned.h"
#include "atomic_base_width.h"
#include "atomic_integral.h"
#include "atomic_pointer.h"
/////////////////////////////////////////////////////////////////////////////////
/**
* NOTE:
*
* All of the actual implementation is done via the ATOMIC_MACROS in the compiler or arch sub folders.
* The C++ code is merely boilerplate around these macros that actually implement the atomic operations.
* The C++ boilerplate is also hidden behind macros.
* This may seem more complicated but this is all meant to reduce copy-pasting and to ensure all operations
* all end up going down to one macro that does the actual implementation.
* The reduced code duplication makes it easier to verify the implementation and reason about it.
* Ensures we do not have to re-implement the same code for compilers that do not support generic builtins such as MSVC.
* Ensures for compilers that have separate intrinsics for different widths, that C++ boilerplate isn't copy-pasted leading to programmer errors.
* Ensures if we ever have to implement a new platform, only the low-level leaf macros have to be implemented, everything else will be generated for you.
*/
#include "atomic_push_compiler_options.h"
namespace eastl
{
namespace internal
{
template <typename T>
struct is_atomic_lockfree_size
{
static EASTL_CPP17_INLINE_VARIABLE constexpr bool value = false ||
#if defined(EASTL_ATOMIC_HAS_8BIT)
sizeof(T) == 1 ||
#endif
#if defined(EASTL_ATOMIC_HAS_16BIT)
sizeof(T) == 2 ||
#endif
#if defined(EASTL_ATOMIC_HAS_32BIT)
sizeof(T) == 4 ||
#endif
#if defined(EASTL_ATOMIC_HAS_64BIT)
sizeof(T) == 8 ||
#endif
#if defined(EASTL_ATOMIC_HAS_128BIT)
sizeof(T) == 16 ||
#endif
false;
};
template <typename T>
struct is_user_type_suitable_for_primary_template
{
static EASTL_CPP17_INLINE_VARIABLE constexpr bool value = eastl::internal::is_atomic_lockfree_size<T>::value;
};
template <typename T>
using select_atomic_inherit_0 = typename eastl::conditional<eastl::is_same_v<bool, T> || eastl::internal::is_user_type_suitable_for_primary_template<T>::value,
eastl::internal::atomic_base_width<T>, /* True */
eastl::internal::atomic_invalid_type<T> /* False */
>::type;
template <typename T>
using select_atomic_inherit = select_atomic_inherit_0<T>;
} // namespace internal
#define EASTL_ATOMIC_CLASS_IMPL(type, base, valueType, differenceType) \
private: \
\
EASTL_ATOMIC_STATIC_ASSERT_TYPE(type); \
\
using Base = base; \
\
public: \
\
typedef valueType value_type; \
typedef differenceType difference_type; \
\
public: \
\
static EASTL_CPP17_INLINE_VARIABLE constexpr bool is_always_lock_free = eastl::internal::is_atomic_lockfree_size<type>::value; \
\
public: /* deleted ctors && assignment operators */ \
\
atomic(const atomic&) EA_NOEXCEPT = delete; \
\
atomic& operator=(const atomic&) EA_NOEXCEPT = delete; \
atomic& operator=(const atomic&) volatile EA_NOEXCEPT = delete; \
\
public: /* ctors */ \
\
EA_CONSTEXPR atomic(type desired) EA_NOEXCEPT \
: Base{ desired } \
{ \
} \
\
EA_CONSTEXPR atomic() EA_NOEXCEPT_IF(eastl::is_nothrow_default_constructible_v<type>) = default; \
\
public: \
\
bool is_lock_free() const EA_NOEXCEPT \
{ \
return eastl::internal::is_atomic_lockfree_size<type>::value; \
} \
\
bool is_lock_free() const volatile EA_NOEXCEPT \
{ \
EASTL_ATOMIC_STATIC_ASSERT_VOLATILE_MEM_FN(type); \
return false; \
}
#define EASTL_ATOMIC_USING_ATOMIC_BASE(type) \
public: \
\
using Base::operator=; \
using Base::store; \
using Base::load; \
using Base::exchange; \
using Base::compare_exchange_weak; \
using Base::compare_exchange_strong; \
\
public: \
\
operator type() const volatile EA_NOEXCEPT \
{ \
EASTL_ATOMIC_STATIC_ASSERT_VOLATILE_MEM_FN(T); \
} \
\
operator type() const EA_NOEXCEPT \
{ \
return load(eastl::memory_order_seq_cst); \
}
#define EASTL_ATOMIC_USING_ATOMIC_INTEGRAL() \
public: \
\
using Base::fetch_add; \
using Base::add_fetch; \
\
using Base::fetch_sub; \
using Base::sub_fetch; \
\
using Base::fetch_and; \
using Base::and_fetch; \
\
using Base::fetch_or; \
using Base::or_fetch; \
\
using Base::fetch_xor; \
using Base::xor_fetch; \
\
using Base::operator++; \
using Base::operator--; \
using Base::operator+=; \
using Base::operator-=; \
using Base::operator&=; \
using Base::operator|=; \
using Base::operator^=;
#define EASTL_ATOMIC_USING_ATOMIC_POINTER() \
public: \
\
using Base::fetch_add; \
using Base::add_fetch; \
using Base::fetch_sub; \
using Base::sub_fetch; \
\
using Base::operator++; \
using Base::operator--; \
using Base::operator+=; \
using Base::operator-=;
template <typename T, typename = void>
struct atomic : protected eastl::internal::select_atomic_inherit<T>
{
EASTL_ATOMIC_CLASS_IMPL(T, eastl::internal::select_atomic_inherit<T>, T, T)
EASTL_ATOMIC_USING_ATOMIC_BASE(T)
};
template <typename T>
struct atomic<T, eastl::enable_if_t<eastl::is_integral_v<T> && !eastl::is_same_v<bool, T>>> : protected eastl::internal::atomic_integral_width<T>
{
EASTL_ATOMIC_CLASS_IMPL(T, eastl::internal::atomic_integral_width<T>, T, T)
EASTL_ATOMIC_USING_ATOMIC_BASE(T)
EASTL_ATOMIC_USING_ATOMIC_INTEGRAL()
};
template <typename T>
struct atomic<T*> : protected eastl::internal::atomic_pointer_width<T*>
{
EASTL_ATOMIC_CLASS_IMPL(T*, eastl::internal::atomic_pointer_width<T*>, T*, ptrdiff_t)
EASTL_ATOMIC_USING_ATOMIC_BASE(T*)
EASTL_ATOMIC_USING_ATOMIC_POINTER()
};
} // namespace eastl
#include "atomic_pop_compiler_options.h"
#endif /* EASTL_ATOMIC_INTERNAL_H */
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