MSTraceLocal (Jikes RVM API)

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org.mmtk.plan.marksweep
Class MSTraceLocal

java.lang.Object
  org.mmtk.plan.TransitiveClosure
      org.mmtk.plan.TraceLocal
          org.mmtk.plan.marksweep.MSTraceLocal

All Implemented Interfaces:: Constants

public final class MSTraceLocal
extends TraceLocal
extends TraceLocal

This class implements the thread-local functionality for a transitive closure over a mark-sweep space.

Field Summary
`private ObjectReferenceDeque`	`modBuffer` Instance fields

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
`MSTraceLocal(Trace trace, ObjectReferenceDeque modBuffer)` Constructor

Method Summary
`boolean`	`isLive(ObjectReference object)` Is the specified object live?
`protected void`	`processRememberedSets()` Process any remembered set entries.
`ObjectReference`	`traceObject(ObjectReference object)` This method is the core method during the trace of the object graph.

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

Methods inherited from class org.mmtk.plan.TraceLocal

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

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

modBuffer

private final ObjectReferenceDeque modBuffer

Instance fields

Constructor Detail

MSTraceLocal

public MSTraceLocal(Trace trace,
                    ObjectReferenceDeque modBuffer)

Constructor

Method Detail

isLive

public boolean isLive(ObjectReference object)

Is the specified object live?

Overrides:: isLive in class TraceLocal

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

traceObject

public ObjectReference traceObject(ObjectReference object)

This method is the core method during the trace of the object graph. The role of this method is to: 1. Ensure the traced object is not collected. 2. If this is the first visit to the object enqueue it to be scanned. 3. Return the forwarded reference to the object. In this instance, we refer objects in the mark-sweep space to the msSpace for tracing, and defer to the superclass for all others.

Overrides:: traceObject in class TraceLocal

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

processRememberedSets

protected void processRememberedSets()

Process any remembered set entries. This means enumerating the mod buffer and for each entry, marking the object as unlogged (we don't enqueue for scanning since we're doing a full heap GC).

Overrides:: processRememberedSets in class TraceLocal