1 /* 2 * Copyright (c) 2011, 2014, 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_implementation.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 HeapRegionManager. 41 42 public class HeapRegionManager extends VMObject { 43 // G1HeapRegionTable _regions 44 static private long regionsFieldOffset; 45 // uint _committed_length 46 static private CIntegerField numCommittedField; 47 48 static { 49 VM.registerVMInitializedObserver(new Observer() { 50 public void update(Observable o, Object data) { 51 initialize(VM.getVM().getTypeDataBase()); 52 } 53 }); 54 } 55 56 static private synchronized void initialize(TypeDataBase db) { 57 Type type = db.lookupType("HeapRegionManager"); 58 59 regionsFieldOffset = type.getField("_regions").getOffset(); 60 numCommittedField = type.getCIntegerField("_num_committed"); 61 } 62 63 private G1HeapRegionTable regions() { 64 Address regionsAddr = addr.addOffsetTo(regionsFieldOffset); 65 return (G1HeapRegionTable) VMObjectFactory.newObject(G1HeapRegionTable.class, 66 regionsAddr); 67 } 68 69 public long capacity() { 70 return length() * HeapRegion.grainBytes(); 71 } 72 73 public long length() { 74 return regions().length(); 75 } 76 77 public long committedLength() { 78 return numCommittedField.getValue(addr); 79 } 80 81 public Iterator<HeapRegion> heapRegionIterator() { 82 return regions().heapRegionIterator(length()); 83 } 84 85 public HeapRegionManager(Address addr) { 86 super(addr); 87 } 88 }