private static OrdinalSet<InstanceKey> findReachableInstances(
final PointerAnalysis<InstanceKey> pts, final PointerKey pkStart) {
final HeapGraph hg = pts.getHeapGraph();
if (!hg.containsNode(pkStart)) {
return OrdinalSet.empty();
}
final OrdinalSetMapping<InstanceKey> mapping = pts.getInstanceKeyMapping();
final BitVectorIntSet resultSet = new BitVectorIntSet();
final NumberedDFSDiscoverTimeIterator<Object> dfsDiscover =
new NumberedDFSDiscoverTimeIterator<Object>(hg, pkStart);
while (dfsDiscover.hasNext()) {
Object obj = dfsDiscover.next();
if (obj instanceof InstanceKey) {
InstanceKey ik = (InstanceKey) obj;
final int ikNum = mapping.getMappedIndex(ik);
resultSet.add(ikNum);
}
}
final OrdinalSet<InstanceKey> reachable = new OrdinalSet<InstanceKey>(resultSet, mapping);
return reachable;
}