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java.lang.Objectpolyglot.visit.NodeVisitor
polyglot.visit.CodeCleaner
public class CodeCleaner
The CodeCleaner
runs over the AST and performs some trivial
dead code elimination, while flattening blocks wherever possible.
Field Summary | |
---|---|
protected AlphaRenamer |
alphaRen
|
protected NodeFactory |
nf
|
Constructor Summary | |
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CodeCleaner(NodeFactory nf)
Creates a visitor for cleaning code. |
Method Summary | |
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protected java.util.List |
clean(java.util.List l)
Performs some trivial dead code elimination on a list of statements. |
protected java.util.List |
flattenBlock(Block b)
Turns a Block into a list of Stmts. |
protected java.util.Set |
labelRefs(Block b)
Traverses a Block and determines the set of label references. |
Node |
leave(Node old,
Node n,
NodeVisitor v)
This method is called after all of the children of n
have been visited. |
Methods inherited from class polyglot.visit.NodeVisitor |
---|
begin, enter, enter, finish, finish, leave, override, override, toString, visitEdge |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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protected NodeFactory nf
protected AlphaRenamer alphaRen
Constructor Detail |
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public CodeCleaner(NodeFactory nf)
nf
- The node factory to be used when generating new nodes.Method Detail |
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public Node leave(Node old, Node n, NodeVisitor v)
NodeVisitor
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.
leave
in class NodeVisitor
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.
n
.protected java.util.List flattenBlock(Block b)
protected java.util.List clean(java.util.List l)
protected java.util.Set labelRefs(Block b)
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