/*
* 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; }
}