@Override
  public Object evaluate(EvaluationContextImpl context) throws EvaluateException {
    Object value = context.getSuspendContext().getVirtualMachine().mirrorOfVoid();
    value = evaluateInitialization(context, value);

    while (true) {
      // condition
      Object codition = evaluateCondition(context);
      if (codition instanceof Boolean) {
        if (!(Boolean)codition) break;
      }
      else if (codition instanceof BooleanValue) {
        if (!((BooleanValue)codition).booleanValue()) break;
      }
      else {
        throw EvaluateExceptionUtil.BOOLEAN_EXPECTED;
      }

      // body
      if (body(context)) break;

      // update
      value = evaluateUpdate(context, value);
    }

    return value;
  }
@Override
  public Object evaluate(EvaluationContextImpl context)