/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.plan.marksweep;
import org.mmtk.plan.*;
import org.mmtk.policy.MarkSweepLocal;
import org.mmtk.policy.Space;
import org.mmtk.utility.alloc.Allocator;
import org.vmmagic.pragma.*;
import org.vmmagic.unboxed.*;
/**
* This class implements <i>per-mutator thread</i> behavior
* and state for the <i>MS</i> plan, which implements a full-heap
* mark-sweep collector.<p>
*
* Specifically, this class defines <i>MS</i> mutator-time allocation
* and per-mutator thread collection semantics (flushing and restoring
* per-mutator allocator state).
*
* @see MS
* @see MSCollector
* @see StopTheWorldMutator
* @see MutatorContext
*/
@Uninterruptible
public class MSMutator extends StopTheWorldMutator {
/****************************************************************************
* Instance fields
*/
/**
*
*/
protected MarkSweepLocal ms = new MarkSweepLocal(MS.msSpace);
/****************************************************************************
* Mutator-time allocation
*/
/**
* {@inheritDoc}<p>
*
* This class handles the default allocator from the mark sweep space,
* and delegates everything else to the superclass.
*/
@Inline
@Override
public Address alloc(int bytes, int align, int offset, int allocator, int site) {
if (allocator == MS.ALLOC_DEFAULT) {
return ms.alloc(bytes, align, offset);
}
return super.alloc(bytes, align, offset, allocator, site);
}
/**
* {@inheritDoc}<p>
*
* Initialize the object header for objects in the mark-sweep space,
* and delegate to the superclass for other objects.
*/
@Inline
@Override
public void postAlloc(ObjectReference ref, ObjectReference typeRef,
int bytes, int allocator) {
if (allocator == MS.ALLOC_DEFAULT)
MS.msSpace.postAlloc(ref);
else
super.postAlloc(ref, typeRef, bytes, allocator);
}
@Override
public Allocator getAllocatorFromSpace(Space space) {
if (space == MS.msSpace) return ms;
return super.getAllocatorFromSpace(space);
}
/****************************************************************************
* Collection
*/
/**
* {@inheritDoc}
*/
@Inline
@Override
public void collectionPhase(short phaseId, boolean primary) {
if (phaseId == MS.PREPARE) {
super.collectionPhase(phaseId, primary);
ms.prepare();
return;
}
if (phaseId == MS.RELEASE) {
ms.release();
super.collectionPhase(phaseId, primary);
return;
}
super.collectionPhase(phaseId, primary);
}
@Override
public void flush() {
super.flush();
ms.flush();
}
}