/** Set the prototype without doing any sanity checks. */
private boolean setPrototypeNoCheck(ObjectType prototype, Node propertyNode) {
ObjectType oldPrototype = prototypeSlot == null ? null : (ObjectType) prototypeSlot.getType();
boolean replacedPrototype = oldPrototype != null;
this.prototypeSlot =
new Property("prototype", prototype, true, propertyNode == null ? source : propertyNode);
prototype.setOwnerFunction(this);
if (oldPrototype != null) {
// Disassociating the old prototype makes this easier to debug--
// we don't have to worry about two prototypes running around.
oldPrototype.setOwnerFunction(null);
}
if (isConstructor() || isInterface()) {
FunctionType superClass = getSuperClassConstructor();
if (superClass != null) {
superClass.addSubType(this);
}
if (isInterface()) {
for (ObjectType interfaceType : getExtendedInterfaces()) {
if (interfaceType.getConstructor() != null) {
interfaceType.getConstructor().addSubType(this);
}
}
}
}
if (replacedPrototype) {
clearCachedValues();
}
return true;
}
/**
* Given a constructor or an interface type, get its superclass constructor or {@code null} if
* none exists.
*/
public FunctionType getSuperClassConstructor() {
Preconditions.checkArgument(isConstructor() || isInterface());
ObjectType maybeSuperInstanceType = getPrototype().getImplicitPrototype();
if (maybeSuperInstanceType == null) {
return null;
}
return maybeSuperInstanceType.getConstructor();
}
private void addRelatedExtendedInterfaces(ObjectType instance, Set<ObjectType> set) {
FunctionType constructor = instance.getConstructor();
if (constructor != null) {
if (!set.add(instance)) {
return;
}
for (ObjectType interfaceType : constructor.getExtendedInterfaces()) {
addRelatedExtendedInterfaces(interfaceType, set);
}
}
}
@Override
public boolean isSubtype(JSType that) {
if (JSType.isSubtypeHelper(this, that)) {
return true;
}
// Union types
if (that.isUnionType()) {
// The static {@code JSType.isSubtype} check already decomposed
// union types, so we don't need to check those again.
return false;
}
// record types
if (that.isRecordType()) {
return RecordType.isSubtype(this, that.toMaybeRecordType());
}
// Interfaces
// Find all the interfaces implemented by this class and compare each one
// to the interface instance.
ObjectType thatObj = that.toObjectType();
ObjectType thatCtor = thatObj == null ? null : thatObj.getConstructor();
if (thatCtor != null && thatCtor.isInterface()) {
Iterable<ObjectType> thisInterfaces = getCtorImplementedInterfaces();
for (ObjectType thisInterface : thisInterfaces) {
if (thisInterface.isSubtype(that)) {
return true;
}
}
}
if (getConstructor() != null && getConstructor().isInterface()) {
for (ObjectType thisInterface : getCtorExtendedInterfaces()) {
if (thisInterface.isSubtype(that)) {
return true;
}
}
}
// other prototype based objects
if (isUnknownType() || implicitPrototypeChainIsUnknown()) {
// If unsure, say 'yes', to avoid spurious warnings.
// TODO(user): resolve the prototype chain completely in all cases,
// to avoid guessing.
return true;
}
return this.isImplicitPrototype(thatObj);
}