RecyclableObject* ForInObjectEnumerator::GetFirstPrototypeWithEnumerableProperties(RecyclableObject* object)
{
RecyclableObject* firstPrototype = nullptr;
if (JavascriptOperators::GetTypeId(object) != TypeIds_HostDispatch)
{
firstPrototype = object;
while (true)
{
firstPrototype = firstPrototype->GetPrototype();
if (JavascriptOperators::GetTypeId(firstPrototype) == TypeIds_Null)
{
firstPrototype = nullptr;
break;
}
if (!DynamicType::Is(firstPrototype->GetTypeId())
|| !DynamicObject::FromVar(firstPrototype)->GetHasNoEnumerableProperties())
{
break;
}
}
}
return firstPrototype;
}
DynamicObject* DynamicObject::FromVar(Var aValue)
{
RecyclableObject* obj = RecyclableObject::FromVar(aValue);
AssertMsg(obj->DbgIsDynamicObject(), "Ensure instance is actually a DynamicObject");
Assert(DynamicType::Is(obj->GetTypeId()));
return static_cast<DynamicObject*>(obj);
}
void CrossSite::MarshalPrototypeChain(ScriptContext* scriptContext, DynamicObject * object)
{
RecyclableObject * prototype = object->GetPrototype();
while (prototype->GetTypeId() != TypeIds_Null && prototype->GetTypeId() != TypeIds_HostDispatch)
{
// We should not see any static type or host dispatch here
DynamicObject * prototypeObject = DynamicObject::FromVar(prototype);
if (prototypeObject->IsCrossSiteObject())
{
break;
}
if (scriptContext != prototypeObject->GetScriptContext() && !prototypeObject->IsExternal())
{
MarshalDynamicObject(scriptContext, prototypeObject);
}
prototype = prototypeObject->GetPrototype();
}
}
BOOL ForInObjectEnumerator::InitializeCurrentEnumerator(RecyclableObject * object, ForInCache * forInCache)
{
EnumeratorFlags flags = enumerator.GetFlags();
RecyclableObject * prototype = object->GetPrototype();
if (prototype == nullptr || prototype->GetTypeId() == TypeIds_Null)
{
// If this is the last object on the prototype chain, we don't need to get the non-enumerable properties any more to track shadowing
flags &= ~EnumeratorFlags::EnumNonEnumerable;
}
return InitializeCurrentEnumerator(object, flags, GetScriptContext(), forInCache);
}
BOOL CrossSite::NeedMarshalVar(Var instance, ScriptContext * requestContext)
{
if (TaggedNumber::Is(instance))
{
return FALSE;
}
RecyclableObject * object = RecyclableObject::UnsafeFromVar(instance);
if (object->GetScriptContext() == requestContext)
{
return FALSE;
}
if (DynamicType::Is(object->GetTypeId()))
{
return !DynamicObject::UnsafeFromVar(object)->IsCrossSiteObject() && !object->IsExternal();
}
return TRUE;
}