| /* |
| * 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.generational.copying; |
| |
| import org.mmtk.plan.generational.Gen; |
| import org.mmtk.plan.generational.GenCollector; |
| import org.mmtk.plan.Plan; |
| import org.mmtk.plan.TraceLocal; |
| import org.mmtk.policy.CopyLocal; |
| import org.mmtk.utility.ForwardingWord; |
| import org.mmtk.utility.HeaderByte; |
| import org.mmtk.utility.alloc.Allocator; |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.unboxed.*; |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class implements <i>per-collector thread</i> behavior and state for |
| * the <code>GenCopy</code> two-generational copying collector.<p> |
| * |
| * Specifically, this class defines semantics specific to the collection of |
| * the mature generation (<code>GenCollector</code> defines nursery semantics). |
| * In particular the mature space allocator is defined (for collection-time |
| * allocation into the mature space), and the mature space per-collector thread |
| * collection time semantics are defined.<p> |
| * |
| * @see GenCopy for a description of the <code>GenCopy</code> algorithm. |
| * |
| * @see GenCopy |
| * @see GenCopyMutator |
| * @see GenCollector |
| * @see org.mmtk.plan.StopTheWorldCollector |
| * @see org.mmtk.plan.CollectorContext |
| */ |
| @Uninterruptible |
| public class GenCopyCollector extends GenCollector { |
| |
| /****************************************************************** |
| * Instance fields |
| */ |
| |
| /** The allocator for the mature space */ |
| private final CopyLocal mature; |
| |
| /** The trace object for full-heap collections */ |
| private final GenCopyMatureTraceLocal matureTrace; |
| |
| /**************************************************************************** |
| * |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public GenCopyCollector() { |
| mature = new CopyLocal(GenCopy.toSpace()); |
| matureTrace = new GenCopyMatureTraceLocal(global().matureTrace, this); |
| } |
| |
| /**************************************************************************** |
| * |
| * 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 (allocator == Plan.ALLOC_LOS) { |
| if (VM.VERIFY_ASSERTIONS) VM.assertions._assert(Allocator.getMaximumAlignedSize(bytes, align) > Plan.MAX_NON_LOS_COPY_BYTES); |
| return los.alloc(bytes, align, offset); |
| } else { |
| if (VM.VERIFY_ASSERTIONS) { |
| VM.assertions._assert(bytes <= Plan.MAX_NON_LOS_COPY_BYTES); |
| VM.assertions._assert(allocator == GenCopy.ALLOC_MATURE_MINORGC || |
| allocator == GenCopy.ALLOC_MATURE_MAJORGC); |
| } |
| return mature.alloc(bytes, align, offset); |
| } |
| } |
| |
| /** |
| * Perform any post-copy actions. In this case we clear any bits used |
| * for this object's GC metadata. |
| * |
| * @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) |
| * @param allocator The allocator to allocate from |
| */ |
| @Inline |
| public final void postCopy(ObjectReference object, ObjectReference typeRef, |
| int bytes, int allocator) { |
| ForwardingWord.clearForwardingBits(object); |
| if (allocator == Plan.ALLOC_LOS) |
| Plan.loSpace.initializeHeader(object, false); |
| else if (GenCopy.IGNORE_REMSETS) |
| GenCopy.immortalSpace.traceObject(getCurrentTrace(), object); // FIXME this does not look right |
| if (Gen.USE_OBJECT_BARRIER) |
| HeaderByte.markAsUnlogged(object); |
| } |
| |
| |
| /***************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Execute a per-collector collection phase. |
| * |
| * @param phaseId The phase to execute. |
| * @param primary True if this thread should peform local single-threaded |
| * actions. |
| */ |
| public void collectionPhase(short phaseId, boolean primary) { |
| if (global().traceFullHeap()) { |
| if (phaseId == GenCopy.PREPARE) { |
| super.collectionPhase(phaseId, primary); |
| if (global().gcFullHeap) mature.rebind(GenCopy.toSpace()); |
| } |
| if (phaseId == GenCopy.CLOSURE) { |
| matureTrace.completeTrace(); |
| return; |
| } |
| if (phaseId == GenCopy.RELEASE) { |
| matureTrace.release(); |
| super.collectionPhase(phaseId, primary); |
| return; |
| } |
| } |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| /***************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** @return The active global plan as a <code>GenCopy</code> instance. */ |
| private static GenCopy global() { |
| return (GenCopy) VM.activePlan.global(); |
| } |
| |
| /** Show the status of the mature allocator. */ |
| protected final void showMature() { |
| mature.show(); |
| } |
| |
| public final TraceLocal getFullHeapTrace() { return matureTrace; } |
| } |