Glossary
========

binfo
     The main data structure in the compiler used to represent the
     inheritance relationships between classes.  The data in the binfo
     can be accessed by the BINFO_ accessor macros.

vtable
virtual function table
     The virtual function table holds information used in virtual
     function dispatching.  In the compiler, they are usually referred
     to as vtables, or vtbls.  The first index is not used in the
     normal way, I believe it is probably used for the virtual
     destructor.

vfield
     vfields can be thought of as the base information needed to build
     vtables.  For every vtable that exists for a class, there is a
     vfield.  See also vtable and virtual function table pointer.  When
     a type is used as a base class to another type, the virtual
     function table for the derived class can be based upon the vtable
     for the base class, just extended to include the additional
     virtual methods declared in the derived class.  The virtual
     function table from a virtual base class is never reused in a
     derived class.  `is_normal' depends upon this.

virtual function table pointer
     These are `FIELD_DECL's that are pointer types that point to
     vtables.  See also vtable and vfield.