| public static GetGetValueOrDefault ( TypeSpec nullableType ) : MethodSpec | ||
| nullableType | TypeSpec | |
| return | MethodSpec | |
protected override void EmitOperation(EmitContext ec)
{
Label is_null_label = ec.DefineLabel();
Label end_label = ec.DefineLabel();
LocalTemporary lt = new LocalTemporary(type);
// Value is on the stack
lt.Store(ec);
var call = new CallEmitter();
call.InstanceExpression = lt;
call.EmitPredefined(ec, NullableInfo.GetHasValue(expr.Type), null);
ec.Emit(OpCodes.Brfalse, is_null_label);
call = new CallEmitter();
call.InstanceExpression = lt;
call.EmitPredefined(ec, NullableInfo.GetGetValueOrDefault(expr.Type), null);
lt.Release(ec);
base.EmitOperation(ec);
ec.Emit(OpCodes.Newobj, NullableInfo.GetConstructor(type));
ec.Emit(OpCodes.Br_S, end_label);
ec.MarkLabel(is_null_label);
LiftedNull.Create(type, loc).Emit(ec);
ec.MarkLabel(end_label);
}
public override void Emit(EmitContext ec)
{
Store(ec);
var call = new CallEmitter();
call.InstanceExpression = this;
//
// Using GetGetValueOrDefault is prefered because JIT can possibly
// inline it whereas Value property contains a throw which is very
// unlikely to be inlined
//
if (useDefaultValue)
{
call.EmitPredefined(ec, NullableInfo.GetGetValueOrDefault(expr.Type), null);
}
else
{
call.EmitPredefined(ec, NullableInfo.GetValue(expr.Type), null);
}
}