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:

java.lang.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 EDU.purdue.cs.bloat.tree.Expr
  type
- Fields inherited from class EDU.purdue.cs.bloat.tree.Node
  parent

Constructor Summary

Constructors
Constructor Description

DefExpr(Type type)
Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
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)`
`java.util.Collection`	`uses()`	Returns the `Expr`s in which the variable defined by this are used.
`int`	`version()`	Returns Number DefExpr this is.

Methods inherited from class EDU.purdue.cs.bloat.tree.Expr
clone, comparator, copyInto, def, equalsExpr, exprHashCode, setDef, setType, stmt, type

Methods inherited from class EDU.purdue.cs.bloat.tree.Node
block, cleanup, copyInto, hasParent, key, parent, replaceWith, replaceWith, setKey, setParent, setValueNumber, toString, valueNumber, visit, visitChildren, visitForceChildren, visitOnly

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - DefExpr
```
public DefExpr(Type type)
```
    Constructor.
    
    Parameters:
    
    type - The Type (descriptor) of this expression
- Method Detail
  - 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 java.util.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)
```