harpoon.IR.Tree
Class LABEL

java.lang.Object
  harpoon.IR.Tree.Tree
      harpoon.IR.Tree.Stm
          harpoon.IR.Tree.LABEL

All Implemented Interfaces:

HCodeElement, HDataElement

public class LABEL
extends Stm
implements HDataElement

LABEL objects define the constant value of the given label to be the current machine code address. This is like a label definition in assembly language. The value NAME(Label l) may be the target of jumps, calls, etc.

Version:

$Id: LABEL.java,v 1.4 2002/04/10 03:05:45 cananian Exp $

Author:

C. Scott Ananian <cananian@alumni.princeton.edu>, based on Modern Compiler Implementation in Java by Andrew Appel.

Nested Class Summary

Nested classes/interfaces inherited from class harpoon.IR.Tree.Tree

Tree.CloneCallback

Field Summary

boolean	exported Flag indicating whether the label should be exported.
Label	label The symbolic name to define.

Fields inherited from class harpoon.IR.Tree.Tree

arrayFactory, child

Constructor Summary

LABEL(TreeFactory tf, HCodeElement source, Label label, boolean exported)
Constructor.

Method Summary

void	accept(TreeVisitor v) Accept a visitor
Stm	build(TreeFactory tf, ExpList kids)
int	kind() Return an integer enumeration of the kind of this Tree.
Tree	rename(TreeFactory tf, TempMap tm, Tree.CloneCallback cb) Rename while cloning a subtree.
String	toString()

Methods inherited from class harpoon.IR.Tree.Stm

build, isNop, linearize, toStm

Methods inherited from class harpoon.IR.Tree.Tree

clone, clone, getChild, getFactory, getFirstChild, getID, getLineNumber, getParent, getSibling, getSourceFile, hashCode, kids, rename, replace, setChild, unlink

Methods inherited from class java.lang.Object

equals, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface harpoon.ClassFile.HDataElement

getID, getSourceFile

Field Detail

label

public final Label label

The symbolic name to define.

exported

public final boolean exported

Flag indicating whether the label should be exported. Only exported labels are visible from other classes and the runtime. Unexported labels *may* be visible from other methods in the same class, but are not required to be.

Constructor Detail

LABEL

public LABEL(TreeFactory tf,
             HCodeElement source,
             Label label,
             boolean exported)

Constructor.

Method Detail

kind

public int kind()

Description copied from class: Tree

Return an integer enumeration of the kind of this Tree. The enumerated values are defined in TreeKind.

Specified by:

kind in class Tree

build

public Stm build(TreeFactory tf,
                 ExpList kids)

Specified by:

build in class Stm

accept

public void accept(TreeVisitor v)

Accept a visitor

Specified by:

accept in class Tree

rename

public Tree rename(TreeFactory tf,
                   TempMap tm,
                   Tree.CloneCallback cb)

Description copied from class: Tree

Rename while cloning a subtree. This node and all child nodes are cloned; the 'temp' information of all TEMP nodes are renamed according to the supplied TempMap. Note that Temps not belonging to this.getFactory().tempFactory() are not affected. The callback() method of the supplied CloneCallback is invoked once on each subtree cloned, starting from the leaves and working back to the root in a post-order depth-first manner.

Specified by:

rename in class Tree

toString

public String toString()

Overrides:

toString in class Object