polyglot.visit
Class ConstantFolder
java.lang.Object
polyglot.visit.NodeVisitor
polyglot.visit.ConstantFolder
public class ConstantFolder
- extends NodeVisitor
Visitor which performs constant folding.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
ConstantFolder
public ConstantFolder(TypeSystem ts,
NodeFactory nf)
typeSystem
public TypeSystem typeSystem()
nodeFactory
public NodeFactory nodeFactory()
leave
public Node leave(Node old,
Node n,
NodeVisitor v_)
- Description copied from class:
NodeVisitor
- This method is called after all of the children of
n
have been visited. In this case, these children were visited by the
visitor v
. This is the last chance for the visitor to
modify the tree rooted at n
. This method will be called
exactly the same number of times as entry
is called.
That is, for each node that is not overriden, enter
and
leave
are each called exactly once.
Note that if old == n
then the vistior should make a copy
of n
before modifying it. It should then return the
modified copy.
This method is typically called by the method
leave(parent, old, n v)
.
If a subclass overrides the method
leave(parent, old, n v)
then this method may not be called.
- Overrides:
leave
in class NodeVisitor
- Parameters:
old
- The original state of root of the current subtree.n
- The current state of the root of the current subtree.v_
- The NodeVisitor
object used to visit the children.
- Returns:
- The final result of the traversal of the tree rooted at
n
.