void CodeGenerator::run()
{
    InitializeNativeTarget();
    ExecutionEngine *ee = ExecutionEngine::create(m_module, false);
    if (ee == NULL)
    {
        std::cerr << "can't create execution engine" << std::endl;
        return;
    }

    std::vector<GenericValue> noargs;
    GenericValue v = ee->runFunction(m_mainFunction, noargs);
}