#ifndef WeakGCMap_h
#define WeakGCMap_h
#include "Handle.h"
#include "JSGlobalData.h"
#include <wtf/HashMap.h>
namespace JSC {
template <typename KeyType, typename MappedType> struct DefaultWeakGCMapFinalizerCallback {
static void* finalizerContextFor(KeyType key)
{
return reinterpret_cast<void*>(key);
}
static KeyType keyForFinalizer(void* context, typename HandleTypes<MappedType>::ExternalType)
{
return reinterpret_cast<KeyType>(context);
}
};
template<typename KeyType, typename MappedType, typename FinalizerCallback = DefaultWeakGCMapFinalizerCallback<KeyType, MappedType>, typename HashArg = typename DefaultHash<KeyType>::Hash, typename KeyTraitsArg = HashTraits<KeyType> >
class WeakGCMap : private WeakHandleOwner {
WTF_MAKE_FAST_ALLOCATED;
WTF_MAKE_NONCOPYABLE(WeakGCMap);
typedef HashMap<KeyType, WeakImpl*, HashArg, KeyTraitsArg> MapType;
typedef typename HandleTypes<MappedType>::ExternalType ExternalType;
typedef typename MapType::iterator map_iterator;
public:
struct iterator {
friend class WeakGCMap;
iterator(map_iterator iter)
: m_iterator(iter)
{
}
std::pair<KeyType, ExternalType> get() const { return std::make_pair(m_iterator->first, HandleTypes<MappedType>::getFromSlot(const_cast<JSValue*>(&m_iterator->second->jsValue()))); }
iterator& operator++() { ++m_iterator; return *this; }
bool operator==(const iterator& other) const { return m_iterator == other.m_iterator; }
bool operator!=(const iterator& other) const { return m_iterator != other.m_iterator; }
private:
map_iterator m_iterator;
};
typedef WTF::HashTableAddResult<iterator> AddResult;
WeakGCMap()
{
}
bool isEmpty() { return m_map.isEmpty(); }
void clear()
{
map_iterator end = m_map.end();
for (map_iterator ptr = m_map.begin(); ptr != end; ++ptr)
WeakSet::deallocate(ptr->second);
m_map.clear();
}
bool contains(const KeyType& key) const
{
return m_map.contains(key);
}
iterator find(const KeyType& key)
{
return m_map.find(key);
}
void remove(iterator iter)
{
ASSERT(iter.m_iterator != m_map.end());
WeakImpl* impl = iter.m_iterator->second;
ASSERT(impl);
WeakSet::deallocate(impl);
m_map.remove(iter.m_iterator);
}
ExternalType get(const KeyType& key) const
{
return HandleTypes<MappedType>::getFromSlot(const_cast<JSValue*>(&m_map.get(key)->jsValue()));
}
AddResult add(JSGlobalData&, const KeyType& key, ExternalType value)
{
typename MapType::AddResult result = m_map.add(key, 0);
if (result.isNewEntry)
result.iterator->second = WeakSet::allocate(value, this, FinalizerCallback::finalizerContextFor(key));
return AddResult(iterator(result.iterator), result.isNewEntry);
}
void set(JSGlobalData& globalData, const KeyType& key, ExternalType value)
{
ASSERT_UNUSED(globalData, globalData.apiLock().currentThreadIsHoldingLock());
typename MapType::AddResult result = m_map.add(key, 0);
if (!result.isNewEntry)
WeakSet::deallocate(result.iterator->second);
result.iterator->second = WeakSet::allocate(value, this, FinalizerCallback::finalizerContextFor(key));
}
ExternalType take(const KeyType& key)
{
WeakImpl* impl = m_map.take(key);
if (!impl)
return HashTraits<ExternalType>::emptyValue();
ExternalType result = HandleTypes<MappedType>::getFromSlot(const_cast<JSValue*>(&impl->jsValue()));
WeakSet::deallocate(impl);
return result;
}
size_t size() { return m_map.size(); }
iterator begin() { return iterator(m_map.begin()); }
iterator end() { return iterator(m_map.end()); }
~WeakGCMap()
{
clear();
}
private:
virtual void finalize(Handle<Unknown> handle, void* context)
{
WeakImpl* impl = m_map.take(FinalizerCallback::keyForFinalizer(context, HandleTypes<MappedType>::getFromSlot(handle.slot())));
ASSERT(impl);
WeakSet::deallocate(impl);
}
MapType m_map;
};
}
#endif // WeakGCMap_h