/**
* Gets the {@code prototype} property of this function type. This is equivalent to {@code
* (ObjectType) getPropertyType("prototype")}.
*/
public ObjectType getPrototype() {
// lazy initialization of the prototype field
if (prototypeSlot == null) {
String refName = getReferenceName();
if (refName == null) {
// Someone is trying to access the prototype of a structural function.
// We don't want to give real properties to this prototype, because
// then it would propagate to all structural functions.
setPrototypeNoCheck(registry.getNativeObjectType(JSTypeNative.UNKNOWN_TYPE), null);
} else {
setPrototype(
new PrototypeObjectType(
registry,
getReferenceName() + ".prototype",
registry.getNativeObjectType(OBJECT_TYPE),
isNativeObjectType(),
null),
null);
}
}
return (ObjectType) prototypeSlot.getType();
}
void setPrototypeBasedOn(ObjectType baseType, Node propertyNode) {
// This is a bit weird. We need to successfully handle these
// two cases:
// Foo.prototype = new Bar();
// and
// Foo.prototype = {baz: 3};
// In the first case, we do not want new properties to get
// added to Bar. In the second case, we do want new properties
// to get added to the type of the anonymous object.
//
// We handle this by breaking it into two cases:
//
// In the first case, we create a new PrototypeObjectType and set
// its implicit prototype to the type being assigned. This ensures
// that Bar will not get any properties of Foo.prototype, but properties
// later assigned to Bar will get inherited properly.
//
// In the second case, we just use the anonymous object as the prototype.
if (baseType.hasReferenceName() || isNativeObjectType() || baseType.isFunctionPrototypeType()) {
baseType = new PrototypeObjectType(registry, getReferenceName() + ".prototype", baseType);
}
setPrototype(baseType, propertyNode);
}