/*
* 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.gpu;
import org.mmtk.plan.*;
import org.mmtk.utility.Log;
import org.mmtk.vm.VM;
import org.vmmagic.pragma.*;
/**
* This class implements <i>per-collector 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> collection behavior
* (through <code>trace</code> and the <code>collectionPhase</code>
* method).<p>
*
* @see GPU for an overview of the mark-sweep algorithm.<p>
*
* @see GPU
* @see GPUMutator
* @see StopTheWorldCollector
* @see CollectorContext
*/
@Uninterruptible
public class GPUCollector extends StopTheWorldCollector {
/****************************************************************************
* Instance fields
*/
protected GPUTraceLocal fullTrace = new GPUTraceLocal(global().msTrace, null, global().gpuQueue);
protected TraceLocal currentTrace = fullTrace;
/****************************************************************************
* Collection
*/
/**
* Perform a per-collector collection phase.
*
* @param phaseId The collection phase to perform
* @param primary Perform any single-threaded activities using this thread.
*/
@Inline
@Override
public void collectionPhase(short phaseId, boolean primary) {
if (phaseId == GPU.PREPARE) {
super.collectionPhase(phaseId, primary);
fullTrace.prepare();
return;
}
if (phaseId == GPU.PRE_CLOSURE) {
// Log.writeln("[GPUGC] Pre-closure (collector)...");
fullTrace.preGPUTrace();
return;
}
if (phaseId == GPU.POST_CLOSURE) {
// Log.writeln("[GPUGC] Post-closure (collector)...");
fullTrace.completeTrace();
return;
}
if (phaseId == GPU.CLOSURE) {
fullTrace.completeTrace();
return;
}
if (phaseId == GPU.RELEASE) {
fullTrace.release();
super.collectionPhase(phaseId, primary);
return;
}
super.collectionPhase(phaseId, primary);
}
/****************************************************************************
* Miscellaneous
*/
/** @return The active global plan as an <code>MS</code> instance. */
@Inline
private static GPU global() {
return (GPU) VM.activePlan.global();
}
/** @return The current trace instance. */
@Override
public final TraceLocal getCurrentTrace() {
return currentTrace;
}
}