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org.mmtk.plan.markcompact
Class MCConstraints

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.markcompact.MCConstraints

public class MCConstraints
extends StopTheWorldConstraints

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
MCConstraints()
           
 
Method Summary
 int gcHeaderBits()
           
 int gcHeaderWords()
           
 int maxNonLOSDefaultAllocBytes()
           
 boolean movesObjects()
           
 boolean needsForwardAfterLiveness()
           
 boolean needsLinearScan()
           
 int numSpecializedScans()
           
 
Methods inherited from class org.mmtk.plan.PlanConstraints
addressBulkCopySupported, booleanBulkCopySupported, byteBulkCopySupported, charBulkCopySupported, doubleBulkCopySupported, extentBulkCopySupported, floatBulkCopySupported, generateGCTrace, generational, intBulkCopySupported, longBulkCopySupported, maxNonLOSCopyBytes, maxNonLOSNonMovingAllocBytes, needsAddressReadBarrier, needsAddressWriteBarrier, needsBooleanReadBarrier, needsBooleanWriteBarrier, needsByteReadBarrier, needsByteWriteBarrier, needsCharReadBarrier, needsCharWriteBarrier, needsConcurrentWorkers, needsDoubleReadBarrier, needsDoubleWriteBarrier, needsExtentReadBarrier, needsExtentWriteBarrier, needsFloatReadBarrier, needsFloatWriteBarrier, needsIntReadBarrier, needsIntWriteBarrier, needsJavaLangReferenceReadBarrier, needsLogBitInHeader, needsLongReadBarrier, needsLongWriteBarrier, needsObjectReferenceNonHeapReadBarrier, needsObjectReferenceNonHeapWriteBarrier, needsObjectReferenceReadBarrier, needsObjectReferenceWriteBarrier, needsOffsetReadBarrier, needsOffsetWriteBarrier, needsShortReadBarrier, needsShortWriteBarrier, needsWordReadBarrier, needsWordWriteBarrier, 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

MCConstraints

public MCConstraints()
Method Detail

movesObjects

public boolean movesObjects()
Overrides:
movesObjects in class PlanConstraints
Returns:
true if this Plan moves objects.

needsForwardAfterLiveness

public boolean needsForwardAfterLiveness()
Overrides:
needsForwardAfterLiveness in class PlanConstraints
Returns:
true if this object forwards objects after determining global object liveness (e.g. many compacting collectors).

needsLinearScan

public boolean needsLinearScan()
Overrides:
needsLinearScan in class PlanConstraints
Returns:
true if this Plan requires linear scanning.

maxNonLOSDefaultAllocBytes

public int maxNonLOSDefaultAllocBytes()
Overrides:
maxNonLOSDefaultAllocBytes in class PlanConstraints
Returns:
Size (in bytes) beyond which new regular objects must be allocated to the LOS

gcHeaderBits

public int gcHeaderBits()
Specified by:
gcHeaderBits in class PlanConstraints
Returns:
The number of header bits that are required.

gcHeaderWords

public int gcHeaderWords()
Specified by:
gcHeaderWords in class PlanConstraints
Returns:
The number of header words that are required.

numSpecializedScans

public int numSpecializedScans()
Overrides:
numSpecializedScans in class PlanConstraints
Returns:
The specialized scan methods required
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