| /* |
| * 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.marksweep; |
| |
| import org.mmtk.plan.Plan; |
| import org.mmtk.plan.TraceLocal; |
| import org.mmtk.plan.generational.*; |
| import org.mmtk.policy.MarkSweepLocal; |
| import org.mmtk.policy.Space; |
| import org.mmtk.utility.HeaderByte; |
| import org.mmtk.utility.alloc.Allocator; |
| import org.mmtk.utility.statistics.Stats; |
| |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| import org.vmmagic.unboxed.*; |
| |
| /** |
| * This class implements <i>per-collector thread</i> behavior and state for |
| * the <code>GenMS</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 GenMS for a description of the <code>GenMS</code> algorithm. |
| * |
| * @see GenMS |
| * @see GenMSMutator |
| * @see GenCollector |
| * @see org.mmtk.plan.StopTheWorldCollector |
| * @see org.mmtk.plan.CollectorContext |
| */ |
| @Uninterruptible |
| public class GenMSCollector extends GenCollector { |
| |
| /***************************************************************************** |
| * |
| * Instance fields |
| */ |
| |
| /** The allocator for the mature space */ |
| private final MarkSweepLocal mature; |
| private final GenMSMatureTraceLocal matureTrace; |
| |
| /** |
| * Constructor |
| */ |
| public GenMSCollector() { |
| mature = new MarkSweepLocal(GenMS.msSpace); |
| matureTrace = new GenMSMatureTraceLocal(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. |
| * @param allocator The allocator to use. |
| * @return The address of the first byte of the allocated region |
| */ |
| @Inline |
| @Override |
| public final Address allocCopy(ObjectReference original, int bytes, |
| int align, int offset, int allocator) { |
| if (Stats.GATHER_MARK_CONS_STATS) { |
| if (Space.isInSpace(GenMS.NURSERY, original)) GenMS.nurseryMark.inc(bytes); |
| } |
| |
| 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 == GenMS.ALLOC_MATURE_MINORGC || |
| allocator == GenMS.ALLOC_MATURE_MAJORGC); |
| } |
| return mature.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 |
| @Override |
| public final void postCopy(ObjectReference object, ObjectReference typeRef, |
| int bytes, int allocator) { |
| if (allocator == Plan.ALLOC_LOS) |
| Plan.loSpace.initializeHeader(object, false); |
| else |
| GenMS.msSpace.postCopy(object, allocator == GenMS.ALLOC_MATURE_MAJORGC); |
| if (Gen.USE_OBJECT_BARRIER) |
| HeaderByte.markAsUnlogged(object); |
| } |
| |
| /***************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Perform a (local) collection phase. |
| * |
| * @param phaseId Collection phase to perform |
| * @param primary Is this thread to do the one-off thread-local tasks |
| */ |
| @NoInline |
| public void collectionPhase(short phaseId, boolean primary) { |
| if (global().traceFullHeap()) { |
| if (phaseId == GenMS.PREPARE) { |
| super.collectionPhase(phaseId, primary); |
| matureTrace.prepare(); |
| if (global().gcFullHeap) mature.prepare(); |
| return; |
| } |
| |
| if (phaseId == GenMS.CLOSURE) { |
| matureTrace.completeTrace(); |
| return; |
| } |
| |
| if (phaseId == GenMS.RELEASE) { |
| matureTrace.release(); |
| if (global().gcFullHeap) { |
| mature.release(); |
| } |
| super.collectionPhase(phaseId, primary); |
| return; |
| } |
| } |
| |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| @Inline |
| public final TraceLocal getFullHeapTrace() { |
| return matureTrace; |
| } |
| |
| /**************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** @return The active global plan as a <code>GenMS</code> instance. */ |
| @Inline |
| private static GenMS global() { |
| return (GenMS) VM.activePlan.global(); |
| } |
| } |