/*
  * @see com.ibm.wala.dataflow.IFDS.ISupergraph#getProcOf(java.lang.Object)
  */
 public PDG getProcOf(Statement n) {
   CGNode node = n.getNode();
   PDG result = sdg.getPDG(node);
   if (result == null) {
     Assertions.UNREACHABLE("panic: " + n + " " + node);
   }
   return result;
 }