org.mmtk.plan.stickyms

Class StickyMSConstraints

java.lang.Object

org.mmtk.plan.PlanConstraints

org.mmtk.plan.SimpleConstraints

org.mmtk.plan.StopTheWorldConstraints

org.mmtk.plan.marksweep.MSConstraints

org.mmtk.plan.stickyms.StickyMSConstraints

public class StickyMSConstraints
extends MSConstraints

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
StickyMSConstraints()

Method Summary

Modifier and Type	Method and Description
int	maxNonLOSDefaultAllocBytes()
boolean	needsLogBitInHeader()
boolean	needsObjectReferenceWriteBarrier()
int	numSpecializedScans()
boolean	objectReferenceBulkCopySupported()

Methods inherited from class org.mmtk.plan.marksweep.MSConstraints

gcHeaderBits, gcHeaderWords

Methods inherited from class org.mmtk.plan.PlanConstraints

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

Methods inherited from class java.lang.Object

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

Constructor Detail

StickyMSConstraints

public StickyMSConstraints()

Method Detail

numSpecializedScans

public int numSpecializedScans()

Overrides:

numSpecializedScans in class MSConstraints

Returns:

The number of specialized scans. We need nursery & full heap.

needsObjectReferenceWriteBarrier

public boolean needsObjectReferenceWriteBarrier()

Overrides:

needsObjectReferenceWriteBarrier in class PlanConstraints

Returns:

true if this Plan requires write barriers on object references.

needsLogBitInHeader

public boolean needsLogBitInHeader()

Overrides:

needsLogBitInHeader in class PlanConstraints

Returns:

true if this Plan requires a header bit for object logging

maxNonLOSDefaultAllocBytes

public int maxNonLOSDefaultAllocBytes()

Overrides:

maxNonLOSDefaultAllocBytes in class MSConstraints

Returns:

Size (in bytes) beyond which new regular objects must be allocated to the LOS

objectReferenceBulkCopySupported

public boolean objectReferenceBulkCopySupported()

Overrides:

objectReferenceBulkCopySupported in class PlanConstraints

Returns:

true if this Plan can perform bulk object arraycopy barriers.