| /* |
| * 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.immix; |
| |
| import org.mmtk.plan.StopTheWorldConstraints; |
| import org.mmtk.policy.immix.ObjectHeader; |
| import static org.mmtk.policy.immix.ImmixConstants.MAX_IMMIX_OBJECT_BYTES; |
| |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class and its subclasses communicate to the host VM/Runtime |
| * any features of the selected plan that it needs to know. This is |
| * separate from the main Plan/PlanLocal class in order to bypass any |
| * issues with ordering of static initialization. |
| */ |
| @Uninterruptible |
| public class ImmixConstraints extends StopTheWorldConstraints { |
| |
| /** @return The number of header bits that are required. */ |
| @Override |
| public int gcHeaderBits() { return ObjectHeader.LOCAL_GC_BITS_REQUIRED; } |
| |
| /** @return The number of header words that are required. */ |
| @Override |
| public int gcHeaderWords() { return ObjectHeader.GC_HEADER_WORDS_REQUIRED; } |
| |
| /** @return True if this plan moves objects. */ |
| @Override |
| public boolean movesObjects() { return true;} |
| |
| /** @return The specialized scan methods required */ |
| @Override |
| public int numSpecializedScans() { return 2; } |
| |
| /** @return Size (in bytes) beyond which new regular objects must be allocated to the LOS */ |
| @Override |
| public int maxNonLOSDefaultAllocBytes() { return MAX_IMMIX_OBJECT_BYTES; } |
| |
| /** @return Size (in bytes) beyond which copied objects must be copied to the LOS */ |
| @Override |
| public int maxNonLOSCopyBytes() { return MAX_IMMIX_OBJECT_BYTES; } |
| } |