Class PersistentCheckElimination

java.lang.Object

EDU.purdue.cs.bloat.trans.PersistentCheckElimination

public class PersistentCheckElimination
extends Object

Attempts to remove residency checks an update checks from a control flow graph.

Field Summary

Fields

Modifier and Type	Field	Description
static boolean	DEBUG

Constructor Summary

Constructors

Constructor	Description
PersistentCheckElimination()

Method Summary

Modifier and Type	Method	Description
void	transform(FlowGraph cfg)	Examines each residency check (RCExpr) and update check (UCExpr) and determines whether or it is redundent.

Methods inherited from class Object

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

Field Details

DEBUG

public static boolean DEBUG

Constructor Details

PersistentCheckElimination

public PersistentCheckElimination()

Method Details

transform

public void transform(FlowGraph cfg)

Examines each residency check (RCExpr) and update check (UCExpr) and determines whether or it is redundent. If a residency check checks something that we know is resident (i.e. the this pointer or the result of an object creation), then the check is redundent. Once an update check has been performed on a value, all subsequent checks are redundent. Redundent checks are removed from the control flow graph.

See Also:

• RCExpr
• UCExpr