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/*
* Copyright (C) 2009, 2012, 2013, 2016 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
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#include "JSCast.h"
#include "WeakSetInlines.h"
#include <wtf/Assertions.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
namespace JSC {
template<typename T> inline Weak<T>::Weak(T* cell, WeakHandleOwner* weakOwner, void* context)
: m_impl(cell ? WeakSet::allocate(cell, weakOwner, context) : nullptr)
{
}
template<typename T> inline bool Weak<T>::isHashTableDeletedValue() const
{
return impl() == hashTableDeletedValue();
}
template<typename T> inline Weak<T>::Weak(WTF::HashTableDeletedValueType)
: m_impl(hashTableDeletedValue())
{
}
template<typename T> inline Weak<T>::Weak(Weak&& other)
: m_impl(other.leakImpl())
{
}
template<class T> inline void swap(Weak<T>& a, Weak<T>& b)
{
a.swap(b);
}
template<typename T> inline void Weak<T>::swap(Weak& other)
{
std::swap(m_impl, other.m_impl);
}
template<typename T> inline auto Weak<T>::operator=(Weak&& other) -> Weak&
{
Weak weak = WTFMove(other);
swap(weak);
return *this;
}
template <typename T>
inline void Weak<T>::set(VM&, T* value)
{
*this = value;
}
template<typename T> inline T* Weak<T>::operator->() const
{
auto* pointer = impl();
ASSERT(pointer && pointer->state() == WeakImpl::Live);
// We can't use jsCast here since we could be called in a finalizer.
return static_cast<T*>(pointer->jsValue().asCell());
}
template<typename T> inline T& Weak<T>::operator*() const
{
auto* pointer = impl();
ASSERT(pointer && pointer->state() == WeakImpl::Live);
// We can't use jsCast here since we could be called in a finalizer.
return *static_cast<T*>(pointer->jsValue().asCell());
}
template<typename T> inline T* Weak<T>::get() const
{
auto* pointer = impl();
if (!pointer || pointer->state() != WeakImpl::Live)
return nullptr;
// We can't use jsCast here since we could be called in a finalizer.
return static_cast<T*>(pointer->jsValue().asCell());
}
template<typename T> inline bool Weak<T>::was(T* other) const
{
return static_cast<T*>(m_impl->jsValue().asCell()) == other;
}
template<typename T> inline bool Weak<T>::operator!() const
{
auto* pointer = impl();
return !pointer || !pointer->jsValue() || pointer->state() != WeakImpl::Live;
}
template<typename T> inline Weak<T>::operator bool() const
{
return !!*this;
}
template<typename T> inline WeakImpl* Weak<T>::leakImpl()
{
auto* pointer = impl();
m_impl = nullptr;
return pointer;
}
template<typename T> inline WeakImpl* Weak<T>::hashTableDeletedValue()
{
return reinterpret_cast<WeakImpl*>(-1);
}
template <typename T> inline bool operator==(const Weak<T>& lhs, const Weak<T>& rhs)
{
return lhs.get() == rhs.get();
}
template<typename T> inline bool operator==(const Weak<T>& lhs, const T* rhs)
{
return lhs.get() == rhs;
}
template<typename T> inline bool operator==(const T* lhs, const Weak<T>& rhs)
{
return lhs == rhs.get();
}
// This function helps avoid modifying a weak table while holding an iterator into it. (Object allocation
// can run a finalizer that modifies the table. We avoid that by requiring a pre-constructed object as our value.)
template<typename Map, typename Key, typename Value> inline void weakAdd(Map& map, const Key& key, Value&& value)
{
ASSERT(!map.get(key));
map.set(key, std::forward<Value>(value)); // The table may still have a zombie for value.
}
template<typename Map, typename Key, typename Value> inline void weakRemove(Map& map, const Key& key, Value value)
{
typename Map::iterator it = map.find(key);
ASSERT_UNUSED(value, value);
ASSERT(it != map.end());
ASSERT(it->value.was(value));
ASSERT(!it->value);
map.remove(it);
}
template<typename T> inline void weakClear(Weak<T>& weak, T* cell)
{
ASSERT_UNUSED(cell, cell);
ASSERT(weak.was(cell));
ASSERT(!weak);
weak.clear();
}
} // namespace JSC
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