Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/G1HeapRegionTable.java @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
parents | 6701abbc4441 |
children |
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/* * Copyright (c) 2013, 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_implementation.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); } }