protected static class DeadCodeEliminator.DefUseFinder extends HaltingVisitor
| Modifier and Type | Field and Description |
|---|---|
protected java.util.Set<LocalInstance> |
def |
protected java.util.Set<LocalInstance> |
use |
bypass, bypassParent| Constructor and Description |
|---|
DeadCodeEliminator.DefUseFinder(JLang lang,
java.util.Set<LocalInstance> def,
java.util.Set<LocalInstance> use) |
| Modifier and Type | Method and Description |
|---|---|
NodeVisitor |
enter(Node n)
Begin normal traversal of a subtree rooted at
n. |
Node |
leave(Node old,
Node n,
NodeVisitor v)
This method is called after all of the children of
n
have been visited. |
bypass, bypass, bypassChildren, override, visitChildrenprotected java.util.Set<LocalInstance> def
protected java.util.Set<LocalInstance> use
public DeadCodeEliminator.DefUseFinder(JLang lang, java.util.Set<LocalInstance> def, java.util.Set<LocalInstance> use)
public NodeVisitor enter(Node n)
NodeVisitorn. This gives
the visitor the option of changing internal state or returning a new
visitor which will be used to visit the children of n.
This method is typically called by the method
enter(parent, n). If a subclass overrides the
method enter(parent, n) then this method
may not be called.
enter in class NodeVisitorn - The root of the subtree to be traversed.NodeVisitor which should be used to visit the
children of n.public Node leave(Node old, Node n, NodeVisitor v)
NodeVisitorn
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 overridden, enter and
leave are each called exactly once.
Note that if old == n then the visitor 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.
leave in class NodeVisitorold - 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.n.