GenRCFindRootSetTraceLocal (Jikes RVM API)

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org.mmtk.plan.refcount.generational
Class GenRCFindRootSetTraceLocal

java.lang.Object
  org.mmtk.plan.TransitiveClosure
      org.mmtk.plan.TraceLocal
          org.mmtk.plan.refcount.generational.GenRCFindRootSetTraceLocal

All Implemented Interfaces:: Constants

public final class GenRCFindRootSetTraceLocal
extends TraceLocal
extends TraceLocal

This class implements the thread-local core functionality for a transitive closure over the heap graph.

Field Summary
`private ObjectReferenceDeque`	`rootBuffer`

Fields inherited from class org.mmtk.plan.TraceLocal
`rootLocations, values`

Fields inherited from class org.mmtk.plan.TransitiveClosure
`specializedScan`

Fields inherited from interface org.mmtk.utility.Constants
ALIGNMENT_VALUE, ARRAY_ELEMENT, BITS_IN_ADDRESS, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_INT, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_INT, BYTES_IN_KBYTE, BYTES_IN_MBYTE, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, CARD_MASK, CARD_META_PAGES_PER_REGION, INSTANCE_FIELD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_INT, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_ADDRESS_SPACE, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_INT, LOG_BYTES_IN_KBYTE, LOG_BYTES_IN_MBYTE, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD, LOG_CARD_BYTES, LOG_CARD_GRAIN, LOG_CARD_META_BYTES, LOG_CARD_META_PAGES, LOG_CARD_META_SIZE, LOG_CARD_UNITS, LOG_MIN_ALIGNMENT, MAX_ALIGNMENT, MAX_BYTES_PADDING, MAX_INT, MIN_ALIGNMENT, MIN_INT, SUPPORT_CARD_SCANNING

Fields inherited from interface org.mmtk.utility.Constants

ALIGNMENT_VALUE, ARRAY_ELEMENT, BITS_IN_ADDRESS, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_INT, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_INT, BYTES_IN_KBYTE, BYTES_IN_MBYTE, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, CARD_MASK, CARD_META_PAGES_PER_REGION, INSTANCE_FIELD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_INT, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_ADDRESS_SPACE, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_INT, LOG_BYTES_IN_KBYTE, LOG_BYTES_IN_MBYTE, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD, LOG_CARD_BYTES, LOG_CARD_GRAIN, LOG_CARD_META_BYTES, LOG_CARD_META_PAGES, LOG_CARD_META_SIZE, LOG_CARD_UNITS, LOG_MIN_ALIGNMENT, MAX_ALIGNMENT, MAX_BYTES_PADDING, MAX_INT, MIN_ALIGNMENT, MIN_INT, SUPPORT_CARD_SCANNING

Constructor Summary
`GenRCFindRootSetTraceLocal(Trace trace, ObjectReferenceDeque rootBuffer)` Constructor

Method Summary
`boolean`	`isLive(ObjectReference object)` Is the specified object reachable?
`ObjectReference`	`traceObject(ObjectReference object)` When we trace a non-root object we do nothing.
`ObjectReference`	`traceObject(ObjectReference object, boolean root)` When we trace a root object we remember it.
`boolean`	`willNotMoveInCurrentCollection(ObjectReference object)` Ensure that the referenced object will not move from this point through to the end of the collection.

Methods inherited from class org.mmtk.plan.TraceLocal
`completeTrace, flush, getForwardedFinalizable, getForwardedReference, getForwardedReferenceType, getForwardedReferent, incrementalTrace, isReachable, isReferentLive, logMessage, overwriteReferenceDuringTrace, prepare, processEdge, processInteriorEdge, processNode, processRememberedSets, processRootEdge, processRoots, readyToFinalize, release, reportDelayedRootEdge, retainForFinalize, retainReferent, scanObject`

Methods inherited from class org.mmtk.plan.TraceLocal

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

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`

Field Detail

rootBuffer

private final ObjectReferenceDeque rootBuffer

Constructor Detail

GenRCFindRootSetTraceLocal

public GenRCFindRootSetTraceLocal(Trace trace,
                                  ObjectReferenceDeque rootBuffer)

Constructor

Method Detail

isLive

public boolean isLive(ObjectReference object)

Is the specified object reachable?

Overrides:: isLive in class TraceLocal

Parameters:: object - The object.
Returns:: true if the object is reachable.

traceObject

public ObjectReference traceObject(ObjectReference object)

When we trace a non-root object we do nothing.

Overrides:: traceObject in class TraceLocal

Parameters:: object - The object to be traced.
Returns:: The new reference to the same object instance.

traceObject

public ObjectReference traceObject(ObjectReference object,
                                   boolean root)

When we trace a root object we remember it.

Overrides:: traceObject in class TraceLocal

Parameters:: object - The object to be traced.; root - Is this object a root?
Returns:: The new reference to the same object instance.

willNotMoveInCurrentCollection

public boolean willNotMoveInCurrentCollection(ObjectReference object)

Description copied from class: TraceLocal

Ensure that the referenced object will not move from this point through to the end of the collection. This can involve forwarding the object if necessary. Non-copying collectors do nothing, copying collectors must override this method in each of their trace classes.