scale.score.analyses
Class VirtualVar

java.lang.Object
  |
  +--scale.common.Root
        |
        +--scale.clef.Node
              |
              +--scale.clef.decl.Declaration
                    |
                    +--scale.clef.decl.ValueDecl
                          |
                          +--scale.clef.decl.VariableDecl
                                |
                                +--scale.score.analyses.VirtualVar

All Implemented Interfaces:

AnnotationInterface, DisplayNode, java.io.Serializable

Direct Known Subclasses:

SubVirtualVar, SuperVirtualVar

public class VirtualVar

extends VariableDecl

A class that represents a virtual variable which is used to handle aliasing and indirect operations in SSA form.

$Id: VirtualVar.java,v 1.19 2002/01/03 21:45:42 burrill Exp $

Copyright 2002 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

A virtual variable is a pseudo-declaration. We don't actually generate code for the declaration, but we treat it like a declaration in the representation.

See Also:

Serialized Form

Field Summary

protected ECR

var

Fields inherited from class scale.clef.decl.Declaration

accessibilities, cAuto, cExtern, cFile, cGlobal, cLocal, cMemory, cPrivate, cProtected, cPublic, cRegister, residencies, visibilitys

Fields inherited from interface scale.common.DisplayNode

ANNO, CLEF, DD, DEFUSE, DOM, EXPR, MAYUSE, TYPE

Constructor Summary

VirtualVar(java.lang.String name, ECR v)
Create a new virtual variable with a given name and associated ECR.

Method Summary

VariableDecl	copy(java.lang.String name) Make a copy of this declaration using a new name.
static int	created() Return the number of instances of this class created.
protected void	finalize() Keep the count of instances up-to-date.
java.lang.String	getDisplayText() Return a String suitable for labeling this node in a graphical display.
ECR	getECR()
java.util.Enumeration	getSubsets() Return an Enumeration of the subset.
VirtualVar	getSuperset() Return the superset virtual variable.
boolean	inSubsets(VirtualVar vv) Return true if vv is in the subset.
boolean	isSuper() Return true if this is a superset virtual variable.
boolean	isVirtual() Return true if the declaration is a virtual variable.
static int	number() Return the current number of instances of this class.
boolean	subsetEquiv(VirtualVar vv) Return true if virtual variable param is equal to this, or this is a superset.

Methods inherited from class scale.clef.decl.VariableDecl

addressTaken, alignment, declareFtnResultVar, getConstantValue, getInitialValue, getOriginal, inMemory, isConst, isFormalArg, isFtnResultVar, isReferenced, isStatic, isTemporary, isVariable, isVolatile, residency, setAddressTaken, setAlignment, setInitialValue, setReferenced, setResidency, setTemporary, shouldBeInRegister, toStringSpecial, visit

Methods inherited from class scale.clef.decl.ValueDecl

createChildren, getValue, setValue

Methods inherited from class scale.clef.decl.Declaration

accessibility, DDname, getCoreType, getDecl, getDisplayColorHint, getDisplayShapeHint, getName, getParent, getScope, getScopeNode, getTag, getType, hashCode, isGlobal, isPure, setAccessibility, setChildParent, setName, setParent, setScope, setTag, setType, setVisibility, visibility

Methods inherited from class scale.clef.Node

getChildren, setAnnotationLevel, setReportLevel, toString, toString, toStringChildren

Methods inherited from class scale.common.Root

addAnnotation, allAnnotations, allMatchingAnnotations, getAnnotation, getDisplayName, getDisplayString, getNodeCount, getNodeID, hasAnnotation, hasEqualAnnotation, removeAnnotation, removeAnnotations, toStringAnnotations, toStringClass

Methods inherited from class java.lang.Object

clone, equals, getClass, notify, notifyAll, wait, wait, wait

Field Detail

var

protected ECR var

Constructor Detail

VirtualVar

public VirtualVar(java.lang.String name,
                  ECR v)

Create a new virtual variable with a given name and associated ECR. The virtual variable does not have a type.

Method Detail

finalize

protected void finalize()
                 throws java.lang.Throwable

Keep the count of instances up-to-date.

Overrides:

finalize in class VariableDecl

Throws:

java.lang.Throwable - [needs description]

number

public static int number()

Return the current number of instances of this class.

created

public static int created()

Return the number of instances of this class created.

getDisplayText

public java.lang.String getDisplayText()

Description copied from class: Declaration

Return a String suitable for labeling this node in a graphical display. This method should be over-ridden as it simplay returns the class name.

Overrides:

getDisplayText in class Declaration

getSuperset

public VirtualVar getSuperset()

Return the superset virtual variable.

isSuper

public boolean isSuper()

Return true if this is a superset virtual variable.

isVirtual

public boolean isVirtual()

Return true if the declaration is a virtual variable.

Overrides:

isVirtual in class Declaration

inSubsets

public boolean inSubsets(VirtualVar vv)

Return true if vv is in the subset.

getSubsets

public java.util.Enumeration getSubsets()

Return an Enumeration of the subset.

subsetEquiv

public boolean subsetEquiv(VirtualVar vv)

Return true if virtual variable param is equal to this, or this is a superset.

copy

public VariableDecl copy(java.lang.String name)

Make a copy of this declaration using a new name.

getECR

public ECR getECR()