/** Print the value numbers for each node in the value graph. */
void printValueNumbers() {
for (Enumeration<GraphNode> e = valueGraph.enumerateVertices(); e.hasMoreElements(); ) {
ValueGraphVertex v = (ValueGraphVertex) e.nextElement();
int valueNumber = v.getValueNumber();
GVCongruenceClass c = B.get(valueNumber);
System.out.println(v.getName() + " " + valueNumber + " " + c.getLabel());
}
}
/**
* Initialize the congruence classes, assuming that all nodes with the same label are congruent.
*/
private void initialize() {
// store a map from label -> congruenceClass
HashMap<Object, GVCongruenceClass> labelMap = new HashMap<Object, GVCongruenceClass>(10);
for (Enumeration<GraphNode> e = valueGraph.enumerateVertices(); e.hasMoreElements(); ) {
ValueGraphVertex v = (ValueGraphVertex) e.nextElement();
Object label = v.getLabel();
GVCongruenceClass c = findOrCreateCongruenceClass(label, labelMap);
// add this node to the congruence class
c.addVertex(v);
// set the value number for the node
v.setValueNumber(c.getValueNumber());
}
}