Class DefExpr

java.lang.Object

EDU.purdue.cs.bloat.tree.Node

EDU.purdue.cs.bloat.tree.Expr

EDU.purdue.cs.bloat.tree.DefExpr

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

MemExpr

public abstract class DefExpr
extends Expr

An expression in which a definition occurs. Each instance has a unique version number associated with it.

Field Summary

Fields inherited from class Expr

type

Fields inherited from class Node

parent

Constructor Summary

Constructors

Constructor	Description
DefExpr(Type type)	Constructor.

Method Summary

Modifier and Type	Method	Description
protected void	addUse(Expr use)
void	cleanupOnly()	Clean up this expression.
boolean	hasUse(Expr use)
boolean	isDef()	Determines whether or not this DefExpr defines a local variable in its parent.
protected void	removeUse(Expr use)
Collection	uses()	Returns the Exprs in which the variable defined by this are used.
int	version()	Returns Number DefExpr this is.

Methods inherited from class Expr

clone, comparator, copyInto, def, equalsExpr, exprHashCode, setDef, setType, stmt, type

Methods inherited from class Node

block, cleanup, copyInto, hasParent, key, parent, replaceWith, replaceWith, setKey, setParent, setValueNumber, toString, valueNumber, visit, visitChildren, visitForceChildren, visitOnly

Methods inherited from class Object

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

Constructor Details

DefExpr

public DefExpr(Type type)

Constructor.

Parameters:

type - The Type (descriptor) of this expression

Method Details

cleanupOnly

public void cleanupOnly()

Clean up this expression. Notify all the expressions that use this definition that it is no longer their defining expression.

Overrides:

cleanupOnly in class Expr

version

public int version()

Returns Number DefExpr this is. This is also the SSA version number of the expression that this DefExpr defines.

isDef

public boolean isDef()

Determines whether or not this DefExpr defines a local variable in its parent.

Overrides:

isDef in class Expr

See Also:

• Assign.defs()

uses

public Collection uses()

Returns the Exprs in which the variable defined by this are used.

hasUse

public boolean hasUse(Expr use)

addUse

protected void addUse(Expr use)

removeUse

protected void removeUse(Expr use)