/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* 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/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.plan.nogc;
import org.mmtk.plan.CollectorContext;
import org.mmtk.plan.TraceLocal;
import org.mmtk.vm.VM;
import org.vmmagic.pragma.Inline;
import org.vmmagic.pragma.Uninterruptible;
/**
* This class implements <i>per-collector thread</i> behavior and state
* for the <i>NoGC</i> plan, which simply allocates (without ever collecting
* until the available space is exhausted.<p>
*
* Specifically, this class <i>would</i> define <i>NoGC</i> collection time semantics,
* however, since this plan never collects, this class consists only of stubs which
* may be useful as a template for implementing a basic collector.
*
* @see NoGC
* @see NoGCMutator
* @see CollectorContext
*/
@Uninterruptible public abstract class NoGCCollector extends CollectorContext {
/************************************************************************
* Instance fields
*/
private final NoGCTraceLocal trace;
/************************************************************************
* Initialization
*/
/**
* Constructor. One instance is created per physical processor.
*/
public NoGCCollector() {
trace = new NoGCTraceLocal(global().trace);
}
/****************************************************************************
*
* Collection
*/
/**
* Perform a garbage collection
*/
public final void collect() {
VM.assertions.fail("GC Triggered in NoGC Plan. Is -X:gc:ignoreSystemGC=true ?");
}
/** Perform some concurrent garbage collection */
public final void concurrentCollect() {
VM.assertions.fail("Concurrent GC Triggered in NoGC Plan.");
}
/**
* Perform a per-collector collection phase.
*
* @param phaseId The collection phase to perform
* @param primary perform any single-threaded local activities.
*/
public final void collectionPhase(short phaseId, boolean primary) {
VM.assertions.fail("GC Triggered in NoGC Plan.");
}
/**
* Perform some concurrent collection work.
*
* @param phaseId The unique phase identifier
*/
public void concurrentCollectionPhase(short phaseId) {
VM.assertions.fail("GC Triggered in NoGC Plan.");
}
/****************************************************************************
*
* Miscellaneous
*/
/** @return The active global plan as a <code>NoGC</code> instance. */
@Inline
private static NoGC global() {
return (NoGC) VM.activePlan.global();
}
/** @return The current trace instance. */
public final TraceLocal getCurrentTrace() { return trace; }
}