| /* |
| * 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.immix; |
| |
| import org.mmtk.plan.*; |
| import org.mmtk.policy.ImmortalLocal; |
| import org.mmtk.policy.immix.CollectorLocal; |
| import org.mmtk.utility.alloc.BumpPointer; |
| import org.mmtk.utility.alloc.ImmixAllocator; |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| import org.vmmagic.unboxed.Address; |
| import org.vmmagic.unboxed.ObjectReference; |
| |
| /** |
| * This class implements <i>per-collector thread</i> behavior |
| * and state for the <i>Immix</i> plan, which implements a full-heap |
| * immix collector.<p> |
| * |
| * Specifically, this class defines <i>Immix</i> collection behavior |
| * (through <code>fastTrace</code> and the <code>collectionPhase</code> |
| * method).<p> |
| * |
| * @see Immix for an overview of the immix algorithm.<p> |
| * |
| * FIXME The SegregatedFreeList class (and its decendents such as |
| * MarkSweepLocal) does not properly separate mutator and collector |
| * behaviors, so the immix field below should really not exist in |
| * this class as there is no collection-time allocation in this |
| * collector. |
| * |
| * @see Immix |
| * @see org.mmtk.policy.immix.MutatorLocal |
| * @see StopTheWorldCollector |
| * @see CollectorContext |
| * @see Phase |
| */ |
| @Uninterruptible |
| public class ImmixCollector extends StopTheWorldCollector { |
| |
| /**************************************************************************** |
| * Instance fields |
| */ |
| protected ImmixTraceLocal fastTrace; |
| protected ImmixDefragTraceLocal defragTrace; |
| protected CollectorLocal immix; |
| protected final ImmixAllocator copy; |
| protected final BumpPointer immortal; |
| protected TraceLocal currentTrace; |
| |
| /**************************************************************************** |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public ImmixCollector() { |
| fastTrace = new ImmixTraceLocal(global().immixTrace, null); |
| defragTrace = new ImmixDefragTraceLocal(global().immixTrace, null); |
| immix = new CollectorLocal(Immix.immixSpace); |
| copy = new ImmixAllocator(Immix.immixSpace, true, true); |
| immortal = new ImmortalLocal(Plan.immortalSpace); |
| } |
| |
| /**************************************************************************** |
| * |
| * Collection-time allocation |
| */ |
| |
| /** |
| * Allocate space for copying an object (this method <i>does not</i> |
| * copy the object, it only allocates space) |
| * |
| * @param original A reference to the original object |
| * @param bytes The size of the space to be allocated (in bytes) |
| * @param align The requested alignment. |
| * @param offset The alignment offset. |
| * @return The address of the first byte of the allocated region |
| */ |
| @Inline |
| public Address allocCopy(ObjectReference original, int bytes, |
| int align, int offset, int allocator) { |
| if (VM.VERIFY_ASSERTIONS) { |
| VM.assertions._assert(bytes <= Plan.MAX_NON_LOS_COPY_BYTES); |
| VM.assertions._assert(allocator == Immix.ALLOC_DEFAULT); |
| } |
| return copy.alloc(bytes, align, offset); |
| } |
| |
| /** |
| * Perform any post-copy actions. |
| * |
| * @param object The newly allocated object |
| * @param typeRef the type reference for the instance being created |
| * @param bytes The size of the space to be allocated (in bytes) |
| */ |
| @Inline |
| public void postCopy(ObjectReference object, ObjectReference typeRef, |
| int bytes, int allocator) { |
| if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(allocator == Immix.ALLOC_DEFAULT); |
| Immix.immixSpace.postCopy(object, bytes, true); |
| |
| if (VM.VERIFY_ASSERTIONS) { |
| VM.assertions._assert(getCurrentTrace().isLive(object)); |
| VM.assertions._assert(getCurrentTrace().willNotMoveInCurrentCollection(object)); |
| } |
| } |
| |
| /**************************************************************************** |
| * |
| * 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 |
| public void collectionPhase(short phaseId, boolean primary) { |
| |
| if (phaseId == Immix.PREPARE) { |
| super.collectionPhase(phaseId, primary); |
| currentTrace = Immix.immixSpace.inImmixDefragCollection() ? defragTrace : fastTrace; |
| immix.prepare(true); |
| currentTrace.prepare(); |
| copy.reset(); |
| return; |
| } |
| |
| if (phaseId == Immix.CLOSURE) { |
| currentTrace.completeTrace(); |
| return; |
| } |
| |
| if (phaseId == Immix.RELEASE) { |
| currentTrace.release(); |
| immix.release(true); |
| super.collectionPhase(phaseId, primary); |
| return; |
| } |
| |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| /**************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** @return The active global plan as an <code>Immix</code> instance. */ |
| @Inline |
| private static Immix global() { |
| return (Immix) VM.activePlan.global(); |
| } |
| |
| /** @return The current fastTrace instance. */ |
| @Inline |
| public final TraceLocal getCurrentTrace() { |
| return currentTrace; |
| } |
| } |