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/*
* Copyright (C) 2012 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#ifndef DOMWrapperMap_h
#define DOMWrapperMap_h
#include "WebCoreMemoryInstrumentation.h"
#include "WrapperTypeInfo.h"
#include <v8.h>
#include <wtf/HashMap.h>
#include <wtf/MemoryInstrumentationHashMap.h>
namespace WebCore {
template<class KeyType>
class DOMWrapperMap {
public:
typedef HashMap<KeyType*, v8::Persistent<v8::Object> > MapType;
explicit DOMWrapperMap(v8::WeakReferenceCallback callback = &defaultWeakCallback)
: m_callback(callback)
{
}
v8::Persistent<v8::Object> get(KeyType* key)
{
return m_map.get(key);
}
void set(KeyType* key, v8::Persistent<v8::Object> wrapper)
{
ASSERT(!m_map.contains(key));
ASSERT(static_cast<KeyType*>(toNative(wrapper)) == key);
wrapper.MakeWeak(this, m_callback);
m_map.set(key, wrapper);
}
void clear()
{
for (typename MapType::iterator it = m_map.begin(); it != m_map.end(); ++it) {
v8::Persistent<v8::Object> wrapper = it->value;
toWrapperTypeInfo(wrapper)->derefObject(it->key);
wrapper.Dispose();
wrapper.Clear();
}
m_map.clear();
}
void reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::Binding);
info.addMember(m_map);
}
void remove(KeyType* key, v8::Persistent<v8::Object> wrapper)
{
typename MapType::iterator it = m_map.find(key);
ASSERT(it != m_map.end());
ASSERT(it->value == wrapper);
m_map.remove(it);
}
private:
static void defaultWeakCallback(v8::Persistent<v8::Value> value, void* context)
{
DOMWrapperMap<KeyType>* map = static_cast<DOMWrapperMap<KeyType>*>(context);
ASSERT(value->IsObject());
v8::Persistent<v8::Object> wrapper = v8::Persistent<v8::Object>::Cast(value);
WrapperTypeInfo* type = toWrapperTypeInfo(wrapper);
ASSERT(type->derefObjectFunction);
KeyType* key = static_cast<KeyType*>(toNative(wrapper));
map->remove(key, wrapper);
wrapper.Dispose();
wrapper.Clear();
type->derefObject(key);
}
v8::WeakReferenceCallback m_callback;
MapType m_map;
};
} // namespace WebCore
#endif // DOMWrapperMap_h
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