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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/GetPtr.h>
#include <wtf/HashTraits.h>
#include <wtf/SingleThreadIntegralWrapper.h>
#include <wtf/ThreadSafeRefCounted.h>
#include <wtf/Threading.h>
#include <wtf/TypeCasts.h>
namespace WTF {
DECLARE_COMPACT_ALLOCATOR_WITH_HEAP_IDENTIFIER(WeakPtrImplBase);
template<typename Derived>
class WeakPtrImplBase : public ThreadSafeRefCounted<Derived> {
WTF_MAKE_NONCOPYABLE(WeakPtrImplBase);
WTF_MAKE_FAST_COMPACT_ALLOCATED_WITH_HEAP_IDENTIFIER(WeakPtrImplBase);
public:
~WeakPtrImplBase() = default;
template<typename T> typename T::WeakValueType* get()
{
return static_cast<typename T::WeakValueType*>(m_ptr);
}
explicit operator bool() const { return m_ptr; }
void clear() { m_ptr = nullptr; }
#if ASSERT_ENABLED
bool wasConstructedOnMainThread() const { return m_wasConstructedOnMainThread; }
#endif
template<typename T>
explicit WeakPtrImplBase(T* ptr)
: m_ptr(static_cast<typename T::WeakValueType*>(ptr))
#if ASSERT_ENABLED
, m_wasConstructedOnMainThread(isMainThread())
#endif
{
}
private:
void* m_ptr;
#if ASSERT_ENABLED
bool m_wasConstructedOnMainThread;
#endif
};
class DefaultWeakPtrImpl final : public WeakPtrImplBase<DefaultWeakPtrImpl> {
public:
template<typename T>
explicit DefaultWeakPtrImpl(T* ptr)
: WeakPtrImplBase<DefaultWeakPtrImpl>(ptr)
{
}
};
DECLARE_COMPACT_ALLOCATOR_WITH_HEAP_IDENTIFIER(WeakPtrImplBaseSingleThread);
template<typename Derived>
class WeakPtrImplBaseSingleThread {
WTF_MAKE_NONCOPYABLE(WeakPtrImplBaseSingleThread);
WTF_MAKE_FAST_COMPACT_ALLOCATED_WITH_HEAP_IDENTIFIER(WeakPtrImplBaseSingleThread);
public:
~WeakPtrImplBaseSingleThread() = default;
template<typename T> typename T::WeakValueType* get()
{
return static_cast<typename T::WeakValueType*>(m_ptr);
}
explicit operator bool() const { return m_ptr; }
void clear() { m_ptr = nullptr; }
#if ASSERT_ENABLED
bool wasConstructedOnMainThread() const { return m_wasConstructedOnMainThread; }
#endif
template<typename T>
explicit WeakPtrImplBaseSingleThread(T* ptr)
: m_ptr(static_cast<typename T::WeakValueType*>(ptr))
#if ASSERT_ENABLED
, m_wasConstructedOnMainThread(isMainThread())
#endif
{
}
uint32_t refCount() const { return m_refCount; }
void ref() const { ++m_refCount; }
void deref() const
{
uint32_t tempRefCount = m_refCount - 1;
if (!tempRefCount) {
delete const_cast<Derived*>(static_cast<const Derived*>(this));
return;
}
m_refCount = tempRefCount;
}
private:
mutable SingleThreadIntegralWrapper<uint32_t> m_refCount { 1 };
void* m_ptr;
#if ASSERT_ENABLED
bool m_wasConstructedOnMainThread;
#endif
};
class SingleThreadWeakPtrImpl final : public WeakPtrImplBaseSingleThread<SingleThreadWeakPtrImpl> {
public:
template<typename T>
explicit SingleThreadWeakPtrImpl(T* ptr)
: WeakPtrImplBaseSingleThread<SingleThreadWeakPtrImpl>(ptr)
{
}
};
} // namespace WTF
using WTF::SingleThreadWeakPtrImpl;
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