protected override ISet <DescriptorKind> Transfer(DivideExpression expression, RuleEngine engine)
{
var left = engine.Visit(expression.Left);
var right = engine.Visit(expression.Right);
if (right.Contains(One.Instance) || left.Contains(Zero.Instance))
{
return(left);
}
if (AllContainRule(LoopIndependent.Instance, left, right))
{
return(_loopIndependentSet);
}
return(_emptySet);
}
/// <summary> /// Transfers the information of the given expression to the resulting set. /// </summary> /// <param name="expression">The expression where the information should be transferred of.</param> /// <param name="engine">The engine applying the transfer.</param> /// <returns>The transferred information.</returns> protected abstract ISet <DescriptorKind> Transfer(TExpression expression, RuleEngine engine);
protected override ISet <DescriptorKind> Transfer(ModuloExpression expression, RuleEngine engine)
{
var left = engine.Visit(expression.Left);
var right = engine.Visit(expression.Right);
var result = new HashSet <DescriptorKind>();
if (left.Contains(Zero.Instance) || right.Contains(One.Instance))
{
result.Add(Zero.Instance);
}
if (AllContainRule(LoopIndependent.Instance, left, right))
{
result.Add(LoopIndependent.Instance);
}
return(result);
}
public ISet <DescriptorKind> Transfer(Expression expression, RuleEngine engine)
{
return(Transfer((TExpression)expression, engine));
}
protected override ISet <DescriptorKind> Transfer(VariableExpression expression, RuleEngine engine)
{
var variableName = expression.Name;
return(engine.Input
.Where(descriptor => descriptor.Name.Equals(variableName))
.Select(descriptor => descriptor.Kind)
.WithoutKind <Definition>()
.ToImmutableHashSet());
}