org.mmtk.plan.generational.marksweep
Class GenMSMatureTraceLocal
java.lang.Object
org.mmtk.plan.TransitiveClosure
org.mmtk.plan.TraceLocal
org.mmtk.plan.generational.GenMatureTraceLocal
org.mmtk.plan.generational.marksweep.GenMSMatureTraceLocal
- All Implemented Interfaces:
- Constants
public final class GenMSMatureTraceLocal
- extends GenMatureTraceLocal
This class implements the core functionality for a transitive
closure over the heap graph, specifically in a Generational Mark-Sweep
collector.
| 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 |
| 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 java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
GenMSMatureTraceLocal
public GenMSMatureTraceLocal(Trace global,
GenCollector plan)
- Constructor
traceObject
public ObjectReference traceObject(ObjectReference object)
- Description copied from class:
TraceLocal
- This method is the core method during the trace of the object graph.
The role of this method is to:
- Ensure the traced object is not collected.
- If this is the first visit to the object enqueue it to be scanned.
- Return the forwarded reference to the object.
- Overrides:
traceObject in class GenMatureTraceLocal
- Parameters:
object - The object to be traced.
- Returns:
- The new reference to the same object instance.
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)
- Description copied from class:
GenMatureTraceLocal
- 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 must not move during the collection.
- Returns:
true if this object is guaranteed not to move during this
collection.