public void InitializeStateType(Module module, string functionName)
{
var stateFieldTypes = new List <LLVMTypeRef>();
// fixed fields
stateFieldTypes.Add(FunctionCompletionStatusType(Context)); // function completion status: 0 = not done, 1 = completed successfully, 2 = panic
stateFieldTypes.Add(Context.WakerType()); // caller waker
// end fixed fields
stateFieldTypes.AddRange(_stateFields.Select(a => Context.AsLLVMType(a.Type)));
StateType = Context.NamedStructType(functionName + "_state_t", stateFieldTypes.ToArray());
}