private Object ensureId(int id) {
Object[] array = valueArray;
if (array == null) {
synchronized (this) {
array = valueArray;
if (array == null) {
array = new Object[maxId * SLOT_SPAN];
valueArray = array;
attributeArray = new short[maxId];
}
}
}
int valueSlot = (id - 1) * SLOT_SPAN + VALUE_SLOT;
Object value = array[valueSlot];
if (value == null) {
if (id == constructorId) {
initSlot(constructorId, "constructor", constructor, constructorAttrs);
constructor = null; // no need to refer it any longer
} else {
obj.initPrototypeId(id);
}
value = array[valueSlot];
if (value == null) {
throw new IllegalStateException(
obj.getClass().getName()
+ ".initPrototypeId(int id) "
+ "did not initialize id="
+ id);
}
}
return value;
}
final IdFunctionObject createPrecachedConstructor() {
if (constructorId != 0) throw new IllegalStateException();
constructorId = obj.findPrototypeId("constructor");
if (constructorId == 0) {
throw new IllegalStateException("No id for constructor property");
}
obj.initPrototypeId(constructorId);
if (constructor == null) {
throw new IllegalStateException(
obj.getClass().getName()
+ ".initPrototypeId() did not "
+ "initialize id="
+ constructorId);
}
constructor.initFunction(obj.getClassName(), ScriptableObject.getTopLevelScope(obj));
constructor.markAsConstructor(obj);
return constructor;
}
