workerClient.stop();
    }

    public void kill() {
        workerClient.stopNow();
    }

    DaemonForkOptions getForkOptions() {
        return forkOptions;
    }

    public int getUses() {
        return uses;
    }

    public KeepAliveMode getKeepAliveMode() {
        return forkOptions.getKeepAliveMode();
    }

    public LogLevel getLogLevel() {
        return logLevel;
    }

// if there is only one.
Operation* GetUserIfOnlyOne(Operation* op) {
  if (op->getNumResults() != 1) return nullptr;
  auto result = op->getResult(0);
  if (!result.hasOneUse()) return nullptr;
  return (*result.getUses().begin()).getOwner();
}

// Gets operation providing value for the given operand of given operation
// if the given operation is the only user.
Operation* GetInputOpWithOneUse(Operation* op, int opr_num) {