| /* |
| * 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.GenMutator; |
| import org.mmtk.policy.CopyLocal; |
| import org.mmtk.policy.Space; |
| import org.mmtk.utility.alloc.Allocator; |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.unboxed.*; |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class implements <i>per-mutator thread</i> behavior and state for |
| * the <code>GenCopy</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 GenCopy for a description of the <code>GenCopy</code> algorithm. |
| * |
| * @see GenCopy |
| * @see GenCopyCollector |
| * @see GenMutator |
| * @see org.mmtk.plan.StopTheWorldMutator |
| * @see org.mmtk.plan.MutatorContext |
| */ |
| @Uninterruptible |
| public class GenCopyMutator extends GenMutator { |
| /****************************************************************** |
| * Instance fields |
| */ |
| |
| /** |
| * The allocator for the copying mature space (the mutator may |
| * "pretenure" objects into this space otherwise used only by |
| * the collector) |
| */ |
| private CopyLocal mature; |
| |
| /**************************************************************************** |
| * |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public GenCopyMutator() { |
| mature = new CopyLocal(); |
| } |
| |
| /** |
| * Called before the MutatorContext is used, but after the context has been |
| * fully registered and is visible to collection. |
| */ |
| public void initMutator(int id) { |
| super.initMutator(id); |
| mature.rebind(GenCopy.toSpace()); |
| } |
| |
| /**************************************************************************** |
| * |
| * Mutator-time allocation |
| */ |
| |
| /** |
| * Allocate space (for an object) in the specified space |
| * |
| * @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 allocate from |
| * @param site Allocation site |
| * @return The address of the first byte of the allocated region |
| */ |
| @Inline |
| public final Address alloc(int bytes, int align, int offset, int allocator, int site) { |
| if (allocator == GenCopy.ALLOC_MATURE) { |
| return mature.alloc(bytes, align, offset); |
| } |
| return super.alloc(bytes, align, offset, allocator, site); |
| } |
| |
| /** |
| * Perform post-allocation initialization of an object |
| * |
| * @param object The newly allocated object |
| * @param typeRef the type reference for the instance being created |
| * @param allocator The allocator to allocate from |
| * @param bytes The size of the space allocated (in bytes) |
| */ |
| @Inline |
| public final void postAlloc(ObjectReference object, ObjectReference typeRef, |
| int bytes, int allocator) { |
| // nothing to be done |
| if (allocator == GenCopy.ALLOC_MATURE) return; |
| super.postAlloc(object, 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 final Allocator getAllocatorFromSpace(Space space) { |
| if (space == GenCopy.matureSpace0 || space == GenCopy.matureSpace1) return mature; |
| return super.getAllocatorFromSpace(space); |
| } |
| |
| |
| /***************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Execute a per-mutator 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.RELEASE) { |
| super.collectionPhase(phaseId, primary); |
| if (global().gcFullHeap) mature.rebind(GenCopy.toSpace()); |
| 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(); |
| } |
| |
| } |