private new Expression <TDelegate> Build()
{
var body = base.Build();
if (body.Type != taskType)
{
body = body.AddEpilogue(taskType.HasResult, new AsyncResultExpression(taskType));
}
Expression <TDelegate> lambda;
using (var builder = new AsyncStateMachineBuilder <TDelegate>(Parameters))
{
lambda = builder.Build(body, tailCall);
}
// build lambda expression
if (!(recursion is null))
{
lambda = Expression.Lambda <TDelegate>(
Expression.Block(
Sequence.Singleton(recursion),
Expression.Assign(recursion, lambda),
Expression.Invoke(recursion, Parameters)), Parameters);
}
return(lambda);
}
internal AsyncStateMachineBuilder(IReadOnlyList <ParameterExpression> parameters)
{
var invokeMethod = DelegateType.GetInvokeMethod <TDelegate>();
methodBuilder = new AsyncStateMachineBuilder(invokeMethod.ReturnType, parameters);
}