mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
/*
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* Copyright (C) 2009, 2015-2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Weak.h"
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#include <wtf/HashMap.h>
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namespace JSC {
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// A HashMap with Weak<JSCell> values, which automatically removes values once they're garbage collected.
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class WeakGCMapBase {
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public:
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virtual ~WeakGCMapBase() { }
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virtual void pruneStaleEntries() = 0;
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};
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template<typename KeyArg, typename ValueArg, typename HashArg = DefaultHash<KeyArg>,
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typename KeyTraitsArg = HashTraits<KeyArg>>
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class WeakGCMap final : public WeakGCMapBase {
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WTF_MAKE_FAST_ALLOCATED;
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typedef Weak<ValueArg> ValueType;
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typedef HashMap<KeyArg, ValueType, HashArg, KeyTraitsArg> HashMapType;
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public:
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typedef typename HashMapType::KeyType KeyType;
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typedef typename HashMapType::AddResult AddResult;
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typedef typename HashMapType::iterator iterator;
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typedef typename HashMapType::const_iterator const_iterator;
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explicit WeakGCMap(VM&);
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~WeakGCMap() final;
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ValueArg* get(const KeyType& key) const
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{
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return m_map.get(key);
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}
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AddResult set(const KeyType& key, ValueType value)
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{
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return m_map.set(key, WTFMove(value));
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}
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bool remove(const KeyType& key)
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{
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return m_map.remove(key);
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}
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void clear()
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{
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m_map.clear();
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}
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bool isEmpty() const
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{
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const_iterator it = m_map.begin();
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const_iterator end = m_map.end();
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while (it != end) {
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if (it->value)
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return true;
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}
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return false;
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}
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inline iterator find(const KeyType& key);
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inline const_iterator find(const KeyType& key) const;
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inline bool contains(const KeyType& key) const;
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void pruneStaleEntries() final;
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private:
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HashMapType m_map;
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VM& m_vm;
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};
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} // namespace JSC
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