org.mmtk.plan.concurrent

Class ConcurrentConstraints

java.lang.Object

org.mmtk.plan.PlanConstraints

org.mmtk.plan.SimpleConstraints

org.mmtk.plan.concurrent.ConcurrentConstraints

Direct Known Subclasses:

CMSConstraints

public abstract class ConcurrentConstraints
extends SimpleConstraints

This class and its subclasses communicate to the host VM/Runtime any features of the selected plan that it needs to know. This is separate from the main Plan/PlanLocal class in order to bypass any issues with ordering of static initialization.

Constructor Summary

Constructors

Constructor and Description
ConcurrentConstraints()

Method Summary

Modifier and Type	Method and Description
boolean	needsConcurrentWorkers()
boolean	needsJavaLangReferenceReadBarrier()
boolean	needsObjectReferenceWriteBarrier()

Methods inherited from class org.mmtk.plan.PlanConstraints

addressBulkCopySupported, booleanBulkCopySupported, byteBulkCopySupported, charBulkCopySupported, doubleBulkCopySupported, extentBulkCopySupported, floatBulkCopySupported, gcHeaderBits, gcHeaderWords, generateGCTrace, generational, intBulkCopySupported, longBulkCopySupported, maxNonLOSCopyBytes, maxNonLOSDefaultAllocBytes, maxNonLOSNonMovingAllocBytes, maxNumGCThreads, movesObjects, needsAddressReadBarrier, needsAddressWriteBarrier, needsBooleanReadBarrier, needsBooleanWriteBarrier, needsByteReadBarrier, needsByteWriteBarrier, needsCharReadBarrier, needsCharWriteBarrier, needsDoubleReadBarrier, needsDoubleWriteBarrier, needsExtentReadBarrier, needsExtentWriteBarrier, needsFloatReadBarrier, needsFloatWriteBarrier, needsForwardAfterLiveness, needsIntReadBarrier, needsIntWriteBarrier, needsLinearScan, needsLogBitInHeader, needsLongReadBarrier, needsLongWriteBarrier, needsObjectReferenceNonHeapReadBarrier, needsObjectReferenceNonHeapWriteBarrier, needsObjectReferenceReadBarrier, needsOffsetReadBarrier, needsOffsetWriteBarrier, needsShortReadBarrier, needsShortWriteBarrier, needsWordReadBarrier, needsWordWriteBarrier, numSpecializedScans, objectReferenceBulkCopySupported, offsetBulkCopySupported, shortBulkCopySupported, withGCspy, wordBulkCopySupported

Methods inherited from class java.lang.Object

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

Constructor Detail

ConcurrentConstraints

public ConcurrentConstraints()

Method Detail

needsConcurrentWorkers

public boolean needsConcurrentWorkers()

Overrides:

needsConcurrentWorkers in class PlanConstraints

Returns:

true if this plan requires concurrent worker threads

needsObjectReferenceWriteBarrier

public boolean needsObjectReferenceWriteBarrier()

Overrides:

needsObjectReferenceWriteBarrier in class PlanConstraints

Returns:

true if this Plan requires write barriers on object references.

needsJavaLangReferenceReadBarrier

public boolean needsJavaLangReferenceReadBarrier()

Overrides:

needsJavaLangReferenceReadBarrier in class PlanConstraints

Returns:

true if this Plan requires read barriers on java.lang.reference types.