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org.mmtk.plan.stickyms
Class StickyMSConstraints

java.lang.Object
  extended by org.mmtk.plan.PlanConstraints
      extended by org.mmtk.plan.SimpleConstraints
          extended by org.mmtk.plan.StopTheWorldConstraints
              extended by org.mmtk.plan.marksweep.MSConstraints
                  extended by 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
StickyMSConstraints()
           
 
Method Summary
 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, 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.
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