1 /* 2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.gc.g1; 26 27 import java.util.Iterator; 28 import java.util.Observable; 29 import java.util.Observer; 30 31 import sun.jvm.hotspot.debugger.Address; 32 import sun.jvm.hotspot.runtime.VM; 33 import sun.jvm.hotspot.runtime.VMObject; 34 import sun.jvm.hotspot.runtime.VMObjectFactory; 35 import sun.jvm.hotspot.types.AddressField; 36 import sun.jvm.hotspot.types.CIntegerField; 37 import sun.jvm.hotspot.types.Type; 38 import sun.jvm.hotspot.types.TypeDataBase; 39 40 // Mirror class for HeapRegionSetBase. Represents a group of regions. 41 42 public class HeapRegionSetBase extends VMObject { 43 44 // uint _length 45 static private CIntegerField lengthField; 46 47 static { 48 VM.registerVMInitializedObserver(new Observer() { 49 public void update(Observable o, Object data) { 50 initialize(VM.getVM().getTypeDataBase()); 51 } 52 }); 53 } 54 55 static private synchronized void initialize(TypeDataBase db) { 56 Type type = db.lookupType("HeapRegionSetBase"); 57 58 lengthField = type.getCIntegerField("_length"); 59 } 60 61 public long length() { 62 return lengthField.getValue(addr); 63 } 64 65 public HeapRegionSetBase(Address addr) { 66 super(addr); 67 } 68 }