protected override Expression VisitUnary(UnaryExpression node)
{
// For OpAssign nodes: if has a yield, we need to do the generator
// transformation on the reduced value.
if (node.CanReduce)
{
return(Visit(node.Reduce()));
}
int yields = _yields.Count;
Expression o = Visit(node.Operand);
if (o == node.Operand)
{
return(node);
}
// Void convert can be jumped into, no need to spill
// TODO: remove when that feature goes away.
if (yields == _yields.Count ||
(node.NodeType == ExpressionType.Convert && node.Type == typeof(void)))
{
return(Expression.MakeUnary(node.NodeType, o, node.Type, node.Method));
}
return(Expression.Block(
ToTemp(ref o),
Expression.MakeUnary(node.NodeType, o, node.Type, node.Method)
));
}
private Node ResolveQuery <T>(UnaryExpression unaryExpression)
{
var exptype = unaryExpression.NodeType;
switch (exptype)
{
case ExpressionType.Convert:
if (unaryExpression.Method != null)
{
return(ResolveQuery <T>(unaryExpression.Reduce() as MethodCallExpression));
}
return(ResolveQuery <T>((dynamic)unaryExpression.Operand));
break;
default:
return(new SingleOperationNode()
{
Operator = unaryExpression.NodeType,
Child = ResolveQuery((dynamic)unaryExpression.Operand)
});
break;
}
//return new SingleOperationNode()
//{
// Operator = unaryExpression.NodeType,
// Child = ResolveQuery((dynamic)unaryExpression.Operand)
//};
}
public void CannotReduceThrow()
{
UnaryExpression throwExp = Expression.Throw(Expression.Constant(new TestException()));
Assert.False(throwExp.CanReduce);
Assert.Same(throwExp, throwExp.Reduce());
Assert.Throws <ArgumentException>(() => throwExp.ReduceAndCheck());
}
protected override Expression VisitUnary(UnaryExpression node)
{
if (node.CanReduce)
{
return(this.Visit(node.Reduce()));
}
return(base.VisitUnary(node));
}
protected override Expression VisitUnary(UnaryExpression node)
{
// reduce inplace increment/decrement:
if (node.CanReduce)
{
return(Visit(node.Reduce()));
}
Debug.Assert(!node.NodeType.IsReadWriteAssignment());
return(base.VisitUnary(node));
}
protected override Expression VisitUnary(UnaryExpression node)
{
// NB: This reduces assignment operators so that the stack spiller doesn't have to worry about it.
if (node.CanReduce)
{
return(node.Reduce());
}
return(base.VisitUnary(node));
}