/*
* 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.jikesrvm.mm.mminterface;
import org.jikesrvm.SizeConstants;
/**
* This class merely exposes the MMTk constants into the Jikes RVM
* package space so that they can be accessed by the VM in an
* MM-neutral way. It is separate from MemoryManager to break
* cyclic class-loading dependencies.
*/
public class MemoryManagerConstants implements SizeConstants {
/** True if the selected plan needs support for linearly scanning the heap */
public static final boolean NEEDS_LINEAR_SCAN = Selected.Constraints.get().needsLinearScan();
/** Number of bits in the GC header required by the selected plan */
public static final int GC_HEADER_BITS = Selected.Constraints.get().gcHeaderBits();
/** Number of additional bytes required in the header by the selected plan */
public static final int GC_HEADER_BYTES = Selected.Constraints.get().gcHeaderWords() << LOG_BYTES_IN_WORD;
/** True if the selected plan requires concurrent worker threads */
public static final boolean NEEDS_CONCURRENT_WORKERS = Selected.Constraints.get().needsConcurrentWorkers();
/** True if the selected plan needs support for generating a GC trace */
public static final boolean GENERATE_GC_TRACE = Selected.Constraints.get().generateGCTrace();
/** True if the selected plan may move objects */
public static final boolean MOVES_OBJECTS = Selected.Constraints.get().movesObjects();
/** True if the selected plan moves tib objects */
public static final boolean MOVES_TIBS = false;
/** True if the selected plan moves code */
public static final boolean MOVES_CODE = false;
}