/*
* 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.refcount;
import static org.mmtk.policy.SegregatedFreeListSpace.MAX_FREELIST_OBJECT_BYTES;
import org.mmtk.plan.StopTheWorldConstraints;
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 RCBaseConstraints extends StopTheWorldConstraints {
@Override
public int gcHeaderBits() {
return RCHeader.GLOBAL_GC_BITS_REQUIRED;
}
@Override
public int gcHeaderWords() {
return RCHeader.GC_HEADER_WORDS_REQUIRED;
}
@Override
public boolean needsObjectReferenceWriteBarrier() {
return true;
}
@Override
public int maxNonLOSDefaultAllocBytes() {
return MAX_FREELIST_OBJECT_BYTES;
}
@Override
public boolean objectReferenceBulkCopySupported() {
return true;
}
/** @return {@code true} if we are building for generational reference counting */
public boolean buildForGenRC() {
return false;
}
}