public void EmitAwaitOnCompletedDynamic(EmitContext ec, FieldExpr awaiter)
{
var critical = Module.PredefinedTypes.ICriticalNotifyCompletion;
if (!critical.Define())
{
throw new NotImplementedException();
}
var temp_critical = new LocalTemporary(critical.TypeSpec);
var label_critical = ec.DefineLabel();
var label_end = ec.DefineLabel();
//
// Special path for dynamic awaiters
//
// var awaiter = this.$awaiter as ICriticalNotifyCompletion;
// if (awaiter == null) {
// var completion = (INotifyCompletion) this.$awaiter;
// this.$builder.AwaitOnCompleted (ref completion, ref this);
// } else {
// this.$builder.AwaitUnsafeOnCompleted (ref awaiter, ref this);
// }
//
awaiter.Emit(ec);
ec.Emit(OpCodes.Isinst, critical.TypeSpec);
temp_critical.Store(ec);
temp_critical.Emit(ec);
ec.Emit(OpCodes.Brtrue_S, label_critical);
var temp = new LocalTemporary(Module.PredefinedTypes.INotifyCompletion.TypeSpec);
awaiter.Emit(ec);
ec.Emit(OpCodes.Castclass, temp.Type);
temp.Store(ec);
EmitOnCompleted(ec, temp, false);
temp.Release(ec);
ec.Emit(OpCodes.Br_S, label_end);
ec.MarkLabel(label_critical);
EmitOnCompleted(ec, temp_critical, true);
ec.MarkLabel(label_end);
temp_critical.Release(ec);
}
public Expression EmitContinuationInitialization(EmitContext ec)
{
//
// When more than 1 awaiter has been used in the block we
// introduce class scope field to cache continuation delegate
//
if (awaiters > 1)
{
if (continuation == null)
{
continuation = AddCompilerGeneratedField("$continuation", new TypeExpression(action, Location), true);
continuation.Define();
}
var fexpr = new FieldExpr(continuation, Location);
fexpr.InstanceExpression = new CompilerGeneratedThis(CurrentType, Location);
//
// if ($continuation == null)
// $continuation = new Action (MoveNext);
//
fexpr.Emit(ec);
var skip_cont_init = ec.DefineLabel();
ec.Emit(OpCodes.Brtrue_S, skip_cont_init);
ec.EmitThis();
EmitActionLoad(ec);
ec.Emit(OpCodes.Stfld, continuation.Spec);
ec.MarkLabel(skip_cont_init);
return(fexpr);
}
//
// Otherwise simply use temporary local variable
//
var field = LocalVariable.CreateCompilerGenerated(action, OriginalSourceBlock, Location);
EmitActionLoad(ec);
field.EmitAssign(ec);
return(new LocalVariableReference(field, Location));
}
