/*
* Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.max.vm.heap.gcx;
import com.sun.max.annotate.*;
import com.sun.max.unsafe.*;
final public class HeapAccounRootCellVisitor extends RootCellVisitor {
final HeapAccountOwner owner;
public HeapAccounRootCellVisitor(HeapAccountOwner owner) {
this.owner = owner;
}
@Override
void reset() {
super.reset();
bottom = HeapRegionInfo.fromRegionID(owner.heapAccount().committedRegions().head()).regionStart();
}
/**
* Check if a non-null pointer is within the area covered by root marking.
*
* @param cell a pointer read from an external root (may be zero).
* @return true if the pointer is in the area covered by root marking.
*/
@INLINE
@Override
boolean isNonNullCovered(Pointer cell) {
return HeapRegionInfo.fromInRegionAddress(cell).owner == owner;
}
}