//Common verifier behaviour for all node types
override protected void DispatchNode(Node node, object data)
{
StackTypes stack = data as StackTypes;
if (stack == null)
{
throw new VerifierException();
}
StackTypes oldStack = GetNodeStack(node);
if (oldStack == null)
{
SetNodeStack(node, stack);
}
else
{
if (Verifier.IsStackMoreGeneral(oldStack, stack))
{
return;
}
stack = Verifier.DoMergeStacks(oldStack, stack); //throws VerifierException
SetNodeStack(node, stack);
}
CallVisitorMethod(node, stack.Clone());
}
protected internal override void VisitBranch(Branch node, object data)
{
StackTypes stack = data as StackTypes;
Verifier.ProcessBrTrueFalse(stack);
AddTask(node.Next, stack);
AddTask(node.Alt, stack.Clone());
}
protected internal override void VisitSwitch(Switch node, object data)
{
StackTypes stack = data as StackTypes;
Verifier.ProcessSwitch(stack);
AddTask(node.Next, stack);
for (int i = 1; i < node.NextArray.Count; i++)
{
AddTask(node.NextArray[i], stack.Clone());
}
}
/* Visiting methods */
protected internal override void VisitServiceNode(ServiceNode node, object data)
{
StackTypes stack = data as StackTypes;
AddTask(node.Next, stack);
for (int i = 1; i < node.NextArray.Count; i++)
{
AddTask(node.NextArray[i], stack.Clone());
}
//Service nodes do not change the stack
}