1 /* 2 * Copyright (c) 2011, 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.gc.shared.CollectedHeap; 33 import sun.jvm.hotspot.gc.shared.CollectedHeapName; 34 import sun.jvm.hotspot.gc.shared.SpaceClosure; 35 import sun.jvm.hotspot.memory.MemRegion; 36 import sun.jvm.hotspot.runtime.VM; 37 import sun.jvm.hotspot.runtime.VMObjectFactory; 38 import sun.jvm.hotspot.types.AddressField; 39 import sun.jvm.hotspot.types.CIntegerField; 40 import sun.jvm.hotspot.types.Type; 41 import sun.jvm.hotspot.types.TypeDataBase; 42 43 // Mirror class for G1CollectedHeap. 44 45 public class G1CollectedHeap extends CollectedHeap { 46 // HeapRegionManager _hrm; 47 static private long hrmFieldOffset; 48 // MemRegion _g1_reserved; 49 static private long g1ReservedFieldOffset; 50 // size_t _summary_bytes_used; 51 static private CIntegerField summaryBytesUsedField; 52 // G1MonitoringSupport* _g1mm; 53 static private AddressField g1mmField; 54 // HeapRegionSet _old_set; 55 static private long oldSetFieldOffset; 56 // HeapRegionSet _humongous_set; 57 static private long humongousSetFieldOffset; 58 59 static { 60 VM.registerVMInitializedObserver(new Observer() { 61 public void update(Observable o, Object data) { 62 initialize(VM.getVM().getTypeDataBase()); 63 } 64 }); 65 } 66 67 static private synchronized void initialize(TypeDataBase db) { 68 Type type = db.lookupType("G1CollectedHeap"); 69 70 hrmFieldOffset = type.getField("_hrm").getOffset(); 71 summaryBytesUsedField = type.getCIntegerField("_summary_bytes_used"); 72 g1mmField = type.getAddressField("_g1mm"); 73 oldSetFieldOffset = type.getField("_old_set").getOffset(); 74 humongousSetFieldOffset = type.getField("_humongous_set").getOffset(); 75 } 76 77 public long capacity() { 78 return hrm().capacity(); 79 } 80 81 public long used() { 82 return summaryBytesUsedField.getValue(addr); 83 } 84 85 public long n_regions() { 86 return hrm().length(); 87 } 88 89 private HeapRegionManager hrm() { 90 Address hrmAddr = addr.addOffsetTo(hrmFieldOffset); 91 return (HeapRegionManager) VMObjectFactory.newObject(HeapRegionManager.class, 92 hrmAddr); 93 } 94 95 public G1MonitoringSupport g1mm() { 96 Address g1mmAddr = g1mmField.getValue(addr); 97 return (G1MonitoringSupport) VMObjectFactory.newObject(G1MonitoringSupport.class, g1mmAddr); 98 } 99 100 public HeapRegionSetBase oldSet() { 101 Address oldSetAddr = addr.addOffsetTo(oldSetFieldOffset); 102 return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class, 103 oldSetAddr); 104 } 105 106 public HeapRegionSetBase humongousSet() { 107 Address humongousSetAddr = addr.addOffsetTo(humongousSetFieldOffset); 108 return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class, 109 humongousSetAddr); 110 } 111 112 private Iterator<HeapRegion> heapRegionIterator() { 113 return hrm().heapRegionIterator(); 114 } 115 116 public void heapRegionIterate(SpaceClosure scl) { 117 Iterator<HeapRegion> iter = heapRegionIterator(); 118 while (iter.hasNext()) { 119 HeapRegion hr = iter.next(); 120 scl.doSpace(hr); 121 } 122 } 123 124 public CollectedHeapName kind() { 125 return CollectedHeapName.G1_COLLECTED_HEAP; 126 } 127 128 public G1CollectedHeap(Address addr) { 129 super(addr); 130 } 131 }