Extend the handling of field names in Fig. $6.18$ to classes and single-inheritance class hierarchies.
- Give an implementation of class $Enu$ that allows linked symbol tables, so that a subclass can either redefine a field name or refer directly to a field name in a superclass.
- Give a translation scheme that allocates a contiguous data area for the fields in a class, including inherited fields. Inherited fields must maintain the relative addresses they were assigned in the layout for the superclass.