| /* |
| * 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.generational.*; |
| import org.mmtk.policy.MarkSweepLocal; |
| import org.mmtk.policy.Space; |
| import org.mmtk.utility.alloc.Allocator; |
| |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| import org.vmmagic.unboxed.*; |
| |
| /** |
| * This class implements <i>per-mutator thread</i> behavior and state for |
| * the <code>GenMS</code> two-generational copying collector.<p> |
| * |
| * Specifically, this class defines mutator-time semantics specific to the |
| * mature generation (<code>GenMutator</code> defines nursery semantics). |
| * In particular the mature space allocator is defined (for mutator-time |
| * allocation into the mature space via pre-tenuring), and the mature space |
| * per-mutator thread collection time semantics are defined (rebinding |
| * the mature space allocator).<p> |
| * |
| * See {@link GenMS} for a description of the <code>GenMS</code> algorithm. |
| * |
| * @see GenMS |
| * @see GenMSCollector |
| * @see GenMutator |
| * @see org.mmtk.plan.StopTheWorldMutator |
| * @see org.mmtk.plan.MutatorContext |
| */ |
| @Uninterruptible |
| public class GenMSMutator extends GenMutator { |
| /****************************************************************** |
| * Instance fields |
| */ |
| |
| /** |
| * The allocator for the mark-sweep mature space (the mutator may |
| * "pretenure" objects into this space which is otherwise used |
| * only by the collector) |
| */ |
| private final MarkSweepLocal mature; |
| |
| |
| /**************************************************************************** |
| * |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public GenMSMutator() { |
| mature = new MarkSweepLocal(GenMS.msSpace); |
| } |
| |
| /**************************************************************************** |
| * |
| * Mutator-time allocation |
| */ |
| |
| /** |
| * Allocate memory for an object. |
| * |
| * @param bytes The number of bytes required for the object. |
| * @param align Required alignment for the object. |
| * @param offset Offset associated with the alignment. |
| * @param allocator The allocator associated with this request. |
| * @param site Allocation site |
| * @return The low address of the allocated memory. |
| */ |
| @Inline |
| public final Address alloc(int bytes, int align, int offset, int allocator, int site) { |
| if (allocator == GenMS.ALLOC_MATURE) { |
| return mature.alloc(bytes, align, offset); |
| } |
| return super.alloc(bytes, align, offset, allocator, site); |
| } |
| |
| /** |
| * Perform post-allocation actions. For many allocators none are |
| * required. |
| * |
| * @param ref 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 number to be used for this allocation |
| */ |
| @Inline |
| public final void postAlloc(ObjectReference ref, ObjectReference typeRef, |
| int bytes, int allocator) { |
| if (allocator == GenMS.ALLOC_MATURE) { |
| GenMS.msSpace.initializeHeader(ref, true); |
| } else { |
| super.postAlloc(ref, typeRef, bytes, allocator); |
| } |
| } |
| |
| /** |
| * Return the allocator instance associated with a space |
| * <code>space</code>, for this plan instance. |
| * |
| * @param space The space for which the allocator instance is desired. |
| * @return The allocator instance associated with this plan instance |
| * which is allocating into <code>space</code>, or <code>null</code> |
| * if no appropriate allocator can be established. |
| */ |
| public Allocator getAllocatorFromSpace(Space space) { |
| if (space == GenMS.msSpace) return mature; |
| return super.getAllocatorFromSpace(space); |
| } |
| |
| /***************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Perform a per-mutator 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); |
| if (global().gcFullHeap) mature.prepare(); |
| return; |
| } |
| |
| if (phaseId == GenMS.RELEASE) { |
| if (global().gcFullHeap) mature.release(); |
| super.collectionPhase(phaseId, primary); |
| return; |
| } |
| } |
| |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| /** |
| * Flush mutator context, in response to a requestMutatorFlush. |
| * Also called by the default implementation of deinitMutator. |
| */ |
| @Override |
| public void flush() { |
| super.flush(); |
| mature.flush(); |
| } |
| |
| /**************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** @return The active global plan as a <code>GenMS</code> instance. */ |
| @Inline |
| private static GenMS global() { |
| return (GenMS) VM.activePlan.global(); |
| } |
| } |