private void calcIDoms() {

    orderStatements();

    colOrderedIDoms.putWithKey(statement.getFirst().id, statement.getFirst().id);

    // exclude first statement
    List<Integer> lstIds = colOrderedIDoms.getLstKeys().subList(1, colOrderedIDoms.getLstKeys().size());

    while (true) {

      boolean changed = false;

      for (Integer id : lstIds) {

        Statement stat = statement.getStats().getWithKey(id);
        Integer idom = null;

        for (StatEdge edge : stat.getAllPredecessorEdges()) {
          if (colOrderedIDoms.getWithKey(edge.getSource().id) != null) {
            idom = getCommonIDom(idom, edge.getSource().id, colOrderedIDoms);
          }
        }

        Integer oldidom = colOrderedIDoms.putWithKey(idom, id);
        if (!idom.equals(oldidom)) {
          changed = true;
        }
      }

      if (!changed) {
        break;
      }
    }
  }
private void calcIDoms()