| /* |
| * Copyright (c) 2013, 2015, 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 sun.jvm.hotspot.gc.g1; |
| |
| import java.util.Iterator; |
| import java.util.Observable; |
| import java.util.Observer; |
| |
| import sun.jvm.hotspot.debugger.Address; |
| import sun.jvm.hotspot.runtime.VM; |
| import sun.jvm.hotspot.runtime.VMObject; |
| import sun.jvm.hotspot.runtime.VMObjectFactory; |
| import sun.jvm.hotspot.types.AddressField; |
| import sun.jvm.hotspot.types.CIntegerField; |
| import sun.jvm.hotspot.types.Type; |
| import sun.jvm.hotspot.types.TypeDataBase; |
| |
| // Mirror class for G1HeapRegionTable. It's essentially an index -> HeapRegion map. |
| |
| public class G1HeapRegionTable extends VMObject { |
| // HeapRegion** _base; |
| static private AddressField baseField; |
| // uint _length; |
| static private CIntegerField lengthField; |
| // HeapRegion** _biased_base |
| static private AddressField biasedBaseField; |
| // size_t _bias |
| static private CIntegerField biasField; |
| // uint _shift_by |
| static private CIntegerField shiftByField; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| static private synchronized void initialize(TypeDataBase db) { |
| Type type = db.lookupType("G1HeapRegionTable"); |
| |
| baseField = type.getAddressField("_base"); |
| lengthField = type.getCIntegerField("_length"); |
| biasedBaseField = type.getAddressField("_biased_base"); |
| biasField = type.getCIntegerField("_bias"); |
| shiftByField = type.getCIntegerField("_shift_by"); |
| } |
| |
| private HeapRegion at(long index) { |
| Address arrayAddr = baseField.getValue(addr); |
| // Offset of &_base[index] |
| long offset = index * VM.getVM().getAddressSize(); |
| Address regionAddr = arrayAddr.getAddressAt(offset); |
| return (HeapRegion) VMObjectFactory.newObject(HeapRegion.class, |
| regionAddr); |
| } |
| |
| public long length() { |
| return lengthField.getValue(addr); |
| } |
| |
| public long bias() { |
| return biasField.getValue(addr); |
| } |
| |
| public long shiftBy() { |
| return shiftByField.getValue(addr); |
| } |
| |
| private class HeapRegionIterator implements Iterator<HeapRegion> { |
| private long index; |
| private long length; |
| private HeapRegion next; |
| |
| public HeapRegion positionToNext() { |
| HeapRegion result = next; |
| while (index < length && at(index) == null) { |
| index++; |
| } |
| if (index < length) { |
| next = at(index); |
| index++; // restart search at next element |
| } else { |
| next = null; |
| } |
| return result; |
| } |
| |
| @Override |
| public boolean hasNext() { return next != null; } |
| |
| @Override |
| public HeapRegion next() { return positionToNext(); } |
| |
| @Override |
| public void remove() { /* not supported */ } |
| |
| HeapRegionIterator(long totalLength) { |
| index = 0; |
| length = totalLength; |
| positionToNext(); |
| } |
| } |
| |
| public Iterator<HeapRegion> heapRegionIterator(long committedLength) { |
| return new HeapRegionIterator(committedLength); |
| } |
| |
| public G1HeapRegionTable(Address addr) { |
| super(addr); |
| } |
| } |