InvokeExpr ie = s.getInvokeExpr();
if (ie instanceof InstanceInvokeExpr) {
InstanceInvokeExpr iie = (InstanceInvokeExpr) ie;
Local receiver = (Local) iie.getBase();
NumberedString subSig =
iie.getMethodRef().getSubSignature();
addVirtualCallSite( s, m, receiver, iie, subSig,
Edge.ieToKind(iie) );
if( subSig == sigStart ) {
addVirtualCallSite( s, m, receiver, iie, sigRun,