import cpp

string describeAccess(FieldAccess access) {
  (access instanceof PointerFieldAccess and result = "ptr")
  or
  (access instanceof ReferenceFieldAccess and result = "ref")
  or
  (access instanceof ValueFieldAccess and result = "val")
  or
  (access instanceof ImplicitThisFieldAccess and result = "this")
}

from FieldAccess access
select access, concat(describeAccess(access), ", ")