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org.mmtk.plan.poisoned
Class PoisonedMutator

java.lang.Object
  extended by org.mmtk.plan.MutatorContext
      extended by org.mmtk.plan.SimpleMutator
          extended by org.mmtk.plan.StopTheWorldMutator
              extended by org.mmtk.plan.marksweep.MSMutator
                  extended by org.mmtk.plan.poisoned.PoisonedMutator
All Implemented Interfaces:
Constants
public class PoisonedMutator
extends MSMutator

This class implements a poisoned collector, that is essentially a test case for read and write barriers in the VM.

Field Summary
 
Fields inherited from class org.mmtk.plan.marksweep.MSMutator
ms
 
Fields inherited from class org.mmtk.plan.MutatorContext
immortal, lgcode, log, los, nonmove, smcode
 
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
 
Constructor Summary
PoisonedMutator()
           
 
Method Summary
 ObjectReference objectReferenceRead(ObjectReference src, Address slot, Word metaDataA, Word metaDataB, int mode)
          Read an object reference.
 boolean objectReferenceTryCompareAndSwap(ObjectReference src, Address slot, ObjectReference old, ObjectReference tgt, Word metaDataA, Word metaDataB, int mode)
          Attempt to atomically exchange the value in the given slot with the passed replacement value.
 void objectReferenceWrite(ObjectReference src, Address slot, ObjectReference tgt, Word metaDataA, Word metaDataB, int mode)
          Write an object reference.
 
Methods inherited from class org.mmtk.plan.marksweep.MSMutator
alloc, collectionPhase, flush, getAllocatorFromSpace, postAlloc
 
Methods inherited from class org.mmtk.plan.MutatorContext
addressBulkCopy, addressRead, addressTryCompareAndSwap, addressWrite, assertRemsetsFlushed, booleanBulkCopy, booleanRead, booleanWrite, byteBulkCopy, byteRead, byteWrite, charBulkCopy, charRead, charWrite, checkAllocator, deinitMutator, doubleBulkCopy, doubleRead, doubleWrite, extentBulkCopy, extentRead, extentWrite, floatBulkCopy, floatRead, floatWrite, flushRememberedSets, getId, getLog, initMutator, intBulkCopy, intRead, intTryCompareAndSwap, intWrite, javaLangReferenceReadBarrier, longBulkCopy, longRead, longTryCompareAndSwap, longWrite, objectReferenceBulkCopy, objectReferenceNonHeapRead, objectReferenceNonHeapWrite, offsetBulkCopy, offsetRead, offsetWrite, shortBulkCopy, shortRead, shortWrite, wordBulkCopy, wordRead, wordTryCompareAndSwap, wordWrite
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PoisonedMutator

public PoisonedMutator()
Method Detail

objectReferenceWrite

public void objectReferenceWrite(ObjectReference src,
                                 Address slot,
                                 ObjectReference tgt,
                                 Word metaDataA,
                                 Word metaDataB,
                                 int mode)
Write an object reference. Take appropriate write barrier actions.

By default do nothing, override if appropriate.

Overrides:
objectReferenceWrite in class MutatorContext
Parameters:
src - The object into which the new reference will be stored
slot - The address into which the new reference will be stored.
tgt - The value of the new reference
metaDataA - A value that assists the host VM in creating a store
metaDataB - A value that assists the host VM in creating a store
mode - The context in which the store occurred

objectReferenceTryCompareAndSwap

public boolean objectReferenceTryCompareAndSwap(ObjectReference src,
                                                Address slot,
                                                ObjectReference old,
                                                ObjectReference tgt,
                                                Word metaDataA,
                                                Word metaDataB,
                                                int mode)
Description copied from class: MutatorContext
Attempt to atomically exchange the value in the given slot with the passed replacement value. If a new reference is created, we must then take appropriate write barrier actions.

By default do nothing, override if appropriate.

Overrides:
objectReferenceTryCompareAndSwap in class MutatorContext
Parameters:
src - The object into which the new reference will be stored
slot - The address into which the new reference will be stored.
old - The old reference to be swapped out
tgt - The target of the new reference
metaDataA - A value that assists the host VM in creating a store
metaDataB - A value that assists the host VM in creating a store
mode - The context in which the store occurred
Returns:
True if the swap was successful.

objectReferenceRead

public ObjectReference objectReferenceRead(ObjectReference src,
                                           Address slot,
                                           Word metaDataA,
                                           Word metaDataB,
                                           int mode)
Description copied from class: MutatorContext
Read an object reference. Take appropriate read barrier action, and return the value that was read.

This is a substituting barrier. The call to this barrier takes the place of a load.

Overrides:
objectReferenceRead in class MutatorContext
Parameters:
src - The object reference holding the field being read.
slot - The address of the slot being read.
metaDataA - A value that assists the host VM in creating a load
metaDataB - A value that assists the host VM in creating a load
mode - The context in which the load occurred
Returns:
The reference that was read.
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