org.mmtk.plan.generational.copying

Class GenCopyMatureTraceLocal

java.lang.Object

org.mmtk.plan.TransitiveClosure

org.mmtk.plan.TraceLocal

org.mmtk.plan.generational.GenMatureTraceLocal

org.mmtk.plan.generational.copying.GenCopyMatureTraceLocal

public final class GenCopyMatureTraceLocal
extends GenMatureTraceLocal

This class implements the core functionality for a transitive closure over the heap graph, specifically in a Generational copying collector.

Field Summary

Fields inherited from class org.mmtk.plan.TraceLocal

rootLocations, values

Fields inherited from class org.mmtk.plan.TransitiveClosure

specializedScan

Constructor Summary

Constructors

Constructor and Description
GenCopyMatureTraceLocal(Trace global, GenCollector plan)

Method Summary

Modifier and Type	Method and Description
private static GenCopy	global()
boolean	isLive(ObjectReference object) Is the specified object live?
ObjectReference	traceObject(ObjectReference object) Trace a reference into the mature space during GC.
boolean	willNotMoveInCurrentCollection(ObjectReference object) Return true if this object is guaranteed not to move during this collection (i.e. this object is definitely not an unforwarded object).

Methods inherited from class org.mmtk.plan.generational.GenMatureTraceLocal

processRememberedSets

Methods inherited from class org.mmtk.plan.TraceLocal

completeTrace, flush, getForwardedFinalizable, getForwardedReference, getForwardedReferenceType, getForwardedReferent, incrementalTrace, isReachable, isReferentLive, logMessage, overwriteReferenceDuringTrace, prepare, processEdge, processInteriorEdge, processNode, processRootEdge, processRoots, readyToFinalize, release, reportDelayedRootEdge, retainForFinalize, retainReferent, scanObject, traceObject

Methods inherited from class org.mmtk.plan.TransitiveClosure

getSpecializedScanClass, registerSpecializedScan

Methods inherited from class java.lang.Object

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

Constructor Detail

GenCopyMatureTraceLocal

public GenCopyMatureTraceLocal(Trace global,
                               GenCollector plan)

Parameters:

global - the global trace class to use

plan - the state of the generational collector

Method Detail

global

private static GenCopy global()

traceObject

public ObjectReference traceObject(ObjectReference object)

Trace a reference into the mature space during GC. This involves determining whether the instance is in from space, and if so, calling the traceObject method of the Copy collector.

Overrides:

traceObject in class GenMatureTraceLocal

Parameters:

object - The object reference to be traced. This is NOT an interior pointer.

Returns:

The possibly moved reference.

isLive

public boolean isLive(ObjectReference object)

Description copied from class: GenMatureTraceLocal

Is the specified object live?

Overrides:

isLive in class GenMatureTraceLocal

Parameters:

object - The object.

Returns:

true if the object is live.

willNotMoveInCurrentCollection

public boolean willNotMoveInCurrentCollection(ObjectReference object)

Return true if this object is guaranteed not to move during this collection (i.e. this object is definitely not an unforwarded object).

Overrides:

willNotMoveInCurrentCollection in class GenMatureTraceLocal

Parameters:

object - the object that might move

Returns:

true if this object is guaranteed not to move during this collection.