/*
* 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.markcompact;
import org.mmtk.plan.StopTheWorldConstraints;
import org.mmtk.policy.MarkCompactSpace;
import org.mmtk.policy.MarkCompactLocal;
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 MCConstraints extends StopTheWorldConstraints {
@Override
public boolean movesObjects() {
return true;
}
@Override
public boolean needsForwardAfterLiveness() {
return true;
}
@Override
public boolean needsLinearScan() {
return true;
}
@Override
public int maxNonLOSDefaultAllocBytes() {
return MarkCompactLocal.MINIMUM_DATA_SIZE;
}
@Override
public int gcHeaderBits() {
return MarkCompactSpace.LOCAL_GC_BITS_REQUIRED;
}
@Override
public int gcHeaderWords() {
return MarkCompactSpace.GC_HEADER_WORDS_REQUIRED;
}
@Override
public int numSpecializedScans() {
return 2;
}
}