1 /* 2 * Copyright (c) 2011, 2017, 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.io.PrintStream; 28 import java.util.Iterator; 29 import java.util.Observable; 30 import java.util.Observer; 31 32 import sun.jvm.hotspot.debugger.Address; 33 import sun.jvm.hotspot.gc.shared.CollectedHeap; 34 import sun.jvm.hotspot.gc.shared.CollectedHeapName; 35 import sun.jvm.hotspot.gc.shared.SpaceClosure; 36 import sun.jvm.hotspot.memory.MemRegion; 37 import sun.jvm.hotspot.runtime.VM; 38 import sun.jvm.hotspot.runtime.VMObjectFactory; 39 import sun.jvm.hotspot.types.AddressField; 40 import sun.jvm.hotspot.types.CIntegerField; 41 import sun.jvm.hotspot.types.Type; 42 import sun.jvm.hotspot.types.TypeDataBase; 43 44 // Mirror class for G1CollectedHeap. 45 46 public class G1CollectedHeap extends CollectedHeap { 47 // HeapRegionManager _hrm; 48 static private long hrmFieldOffset; 49 // MemRegion _g1_reserved; 50 static private long g1ReservedFieldOffset; 51 // size_t _summary_bytes_used; 52 static private CIntegerField summaryBytesUsedField; 53 // G1MonitoringSupport* _g1mm; 54 static private AddressField g1mmField; 55 // HeapRegionSet _old_set; 56 static private long oldSetFieldOffset; 57 // HeapRegionSet _humongous_set; 58 static private long humongousSetFieldOffset; 59 60 static { 61 VM.registerVMInitializedObserver(new Observer() { 62 public void update(Observable o, Object data) { 63 initialize(VM.getVM().getTypeDataBase()); 64 } 65 }); 66 } 67 68 static private synchronized void initialize(TypeDataBase db) { 69 Type type = db.lookupType("G1CollectedHeap"); 70 71 hrmFieldOffset = type.getField("_hrm").getOffset(); 72 summaryBytesUsedField = type.getCIntegerField("_summary_bytes_used"); 73 g1mmField = type.getAddressField("_g1mm"); 74 oldSetFieldOffset = type.getField("_old_set").getOffset(); 75 humongousSetFieldOffset = type.getField("_humongous_set").getOffset(); 76 } 77 78 public long capacity() { 79 return hrm().capacity(); 80 } 81 82 public long used() { 83 return summaryBytesUsedField.getValue(addr); 84 } 85 86 public long n_regions() { 87 return hrm().length(); 88 } 89 90 public HeapRegionManager hrm() { 91 Address hrmAddr = addr.addOffsetTo(hrmFieldOffset); 92 return (HeapRegionManager) VMObjectFactory.newObject(HeapRegionManager.class, 93 hrmAddr); 94 } 95 96 public G1MonitoringSupport g1mm() { 97 Address g1mmAddr = g1mmField.getValue(addr); 98 return (G1MonitoringSupport) VMObjectFactory.newObject(G1MonitoringSupport.class, g1mmAddr); 99 } 100 101 public HeapRegionSetBase oldSet() { 102 Address oldSetAddr = addr.addOffsetTo(oldSetFieldOffset); 103 return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class, 104 oldSetAddr); 105 } 106 107 public HeapRegionSetBase humongousSet() { 108 Address humongousSetAddr = addr.addOffsetTo(humongousSetFieldOffset); 109 return (HeapRegionSetBase) VMObjectFactory.newObject(HeapRegionSetBase.class, 110 humongousSetAddr); 111 } 112 113 private Iterator<HeapRegion> heapRegionIterator() { 114 return hrm().heapRegionIterator(); 115 } 116 117 public void heapRegionIterate(SpaceClosure scl) { 118 Iterator<HeapRegion> iter = heapRegionIterator(); 119 while (iter.hasNext()) { 120 HeapRegion hr = iter.next(); 121 scl.doSpace(hr); 122 } 123 } 124 125 public CollectedHeapName kind() { 126 return CollectedHeapName.G1_COLLECTED_HEAP; 127 } 128 129 @Override 130 public void printOn(PrintStream tty) { 131 MemRegion mr = reservedRegion(); 132 133 tty.print("garbage-first heap"); 134 tty.print(" [" + mr.start() + ", " + mr.end() + "]"); 135 tty.println(" region size " + (HeapRegion.grainBytes() / 1024) + "K"); 136 } 137 138 public G1CollectedHeap(Address addr) { 139 super(addr); 140 } 141 }