| /* |
| * 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.semispace; |
| |
| import org.mmtk.plan.*; |
| import org.mmtk.policy.CopyLocal; |
| import org.mmtk.policy.Space; |
| import org.mmtk.utility.alloc.Allocator; |
| |
| import org.vmmagic.unboxed.*; |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class implements <i>per-mutator thread</i> behavior |
| * and state for the <i>SS</i> plan, which implements a full-heap |
| * semi-space collector.<p> |
| * |
| * Specifically, this class defines <i>SS</i> mutator-time allocation |
| * and per-mutator thread collection semantics (flushing and restoring |
| * per-mutator allocator state).<p> |
| * |
| * See {@link SS} for an overview of the semi-space algorithm.<p> |
| * |
| * @see SS |
| * @see SSCollector |
| * @see StopTheWorldMutator |
| * @see MutatorContext |
| */ |
| @Uninterruptible |
| public class SSMutator extends StopTheWorldMutator { |
| /**************************************************************************** |
| * Instance fields |
| */ |
| protected final CopyLocal ss; |
| |
| /**************************************************************************** |
| * |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public SSMutator() { |
| ss = 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); |
| ss.rebind(SS.toSpace()); |
| } |
| |
| /**************************************************************************** |
| * |
| * Mutator-time allocation |
| */ |
| |
| /** |
| * Allocate space (for an 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 number to be used for this allocation |
| * @param site Allocation site |
| * @return The address of the first byte of the allocated region |
| */ |
| @Inline |
| public Address alloc(int bytes, int align, int offset, int allocator, int site) { |
| if (allocator == SS.ALLOC_SS) |
| return ss.alloc(bytes, align, offset); |
| else |
| return super.alloc(bytes, align, offset, allocator, site); |
| } |
| |
| /** |
| * Perform post-allocation actions. For many allocators none are |
| * required. |
| * |
| * @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 number to be used for this allocation |
| */ |
| @Inline |
| public void postAlloc(ObjectReference object, ObjectReference typeRef, |
| int bytes, int allocator) { |
| if (allocator == SS.ALLOC_SS) 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 Allocator getAllocatorFromSpace(Space space) { |
| if (space == SS.copySpace0 || space == SS.copySpace1) return ss; |
| return super.getAllocatorFromSpace(space); |
| } |
| |
| /**************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Perform a per-mutator 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 == SS.PREPARE) { |
| super.collectionPhase(phaseId, primary); |
| return; |
| } |
| |
| if (phaseId == SS.RELEASE) { |
| super.collectionPhase(phaseId, primary); |
| // rebind the allocation bump pointer to the appropriate semispace. |
| ss.rebind(SS.toSpace()); |
| return; |
| } |
| |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| |
| /**************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** |
| * Show the status of each of the allocators. |
| */ |
| public final void show() { |
| ss.show(); |
| los.show(); |
| immortal.show(); |
| } |
| |
| } |