/*
* 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.utility.options;
import org.mmtk.vm.VM;
/**
* Option to enable an optimization that only scans the part of the stack that has changed since the last GC.
*/
public final class UseShortStackScans extends org.vmutil.options.BooleanOption {
/**
* Create the option.
*/
public UseShortStackScans() {
super(Options.set, "Use Short Stack Scans",
"Use optimization that only scans the part of the stack that has changed since last GC?",
false);
}
@Override
protected void validate() {
if (!VM.scanning.supportsReturnBarrier() && value) fail("Use of short stack scans only implemented on IA32 32-bit");
}
}