| /* |
| * Copyright (c) 2011, 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.ArrayList; |
| import java.util.List; |
| import java.util.Observable; |
| import java.util.Observer; |
| import sun.jvm.hotspot.debugger.Address; |
| import sun.jvm.hotspot.memory.CompactibleSpace; |
| import sun.jvm.hotspot.memory.MemRegion; |
| import sun.jvm.hotspot.runtime.VM; |
| 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 HeapRegion. Currently we don't actually include |
| // any of its fields but only iterate over it. |
| |
| public class HeapRegion extends CompactibleSpace { |
| // static int GrainBytes; |
| static private CIntegerField grainBytesField; |
| static private AddressField topField; |
| |
| 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("HeapRegion"); |
| |
| grainBytesField = type.getCIntegerField("GrainBytes"); |
| topField = type.getAddressField("_top"); |
| |
| } |
| |
| static public long grainBytes() { |
| return grainBytesField.getValue(); |
| } |
| |
| public HeapRegion(Address addr) { |
| super(addr); |
| } |
| |
| public Address top() { |
| return topField.getValue(addr); |
| } |
| |
| @Override |
| public List getLiveRegions() { |
| List res = new ArrayList(); |
| res.add(new MemRegion(bottom(), top())); |
| return res; |
| } |
| |
| @Override |
| public long used() { |
| return top().minus(bottom()); |
| } |
| |
| @Override |
| public long free() { |
| return end().minus(top()); |
| } |
| } |