ReentrentLock on this object or super object

Question

While delving deep in Java concurrency I found an example of Reenterant locking mechanism in Java Concurrency in practice

public class Widget {
     public synchronized void doSomething() {
...
}
}
public class LoggingWidget extends Widget {
   public synchronized void doSomething() {
       System.out.println(toString() + ": calling doSomething");
       super.doSomething(); // which object is locked this or super
   }
}

while calling method LoggingWidget.doSomething() LoggingWidget object's lock is acquired by thread . This method also call super.doSomething() in method its body. Which object is locked while calling super.doSomething() , Widget or LoggingWidget?