static void cachedStringCallback(v8::Persistent<v8::Value> wrapper, void* parameter)
{
ASSERT(WTF::isMainThread());
StringImpl* stringImpl = static_cast<StringImpl*>(parameter);
ASSERT(getStringCache().contains(stringImpl));
getStringCache().remove(stringImpl);
wrapper.Dispose();
stringImpl->deref();
}
v8::Local<v8::String> v8ExternalString(const String& string)
{
StringImpl* stringImpl = string.impl();
if (!stringImpl || !stringImpl->length())
return v8::String::Empty();
if (!stringImplCacheEnabled)
return makeExternalString(string);
StringCache& stringCache = getStringCache();
v8::String* cachedV8String = stringCache.get(stringImpl);
if (cachedV8String)
{
v8::Persistent<v8::String> handle(cachedV8String);
if (!handle.IsNearDeath() && !handle.IsEmpty())
return v8::Local<v8::String>::New(handle);
}
v8::Local<v8::String> newString = makeExternalString(string);
if (newString.IsEmpty())
return newString;
v8::Persistent<v8::String> wrapper = v8::Persistent<v8::String>::New(newString);
if (wrapper.IsEmpty())
return newString;
stringImpl->ref();
wrapper.MakeWeak(stringImpl, cachedStringCallback);
stringCache.set(stringImpl, *wrapper);
return newString;
}