1 /* 2 * Copyright (c) 2011, 2019, 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.ArrayList; 29 import java.util.List; 30 import java.util.Observable; 31 import java.util.Observer; 32 import sun.jvm.hotspot.debugger.Address; 33 import sun.jvm.hotspot.debugger.OopHandle; 34 import sun.jvm.hotspot.gc.shared.CompactibleSpace; 35 import sun.jvm.hotspot.gc.shared.LiveRegionsProvider; 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 HeapRegion. Currently we don't actually include 45 // any of its fields but only iterate over it. 46 47 public class HeapRegion extends CompactibleSpace implements LiveRegionsProvider { 48 // static int GrainBytes; 49 static private CIntegerField grainBytesField; 50 static private AddressField topField; 51 private static long typeFieldOffset; 52 private static long pointerSize; 53 54 private HeapRegionType type; 55 56 static { 57 VM.registerVMInitializedObserver(new Observer() { 58 public void update(Observable o, Object data) { 59 initialize(VM.getVM().getTypeDataBase()); 60 } 61 }); 62 } 63 64 static private synchronized void initialize(TypeDataBase db) { 65 Type type = db.lookupType("HeapRegion"); 66 67 grainBytesField = type.getCIntegerField("GrainBytes"); 68 topField = type.getAddressField("_top"); 69 typeFieldOffset = type.getField("_type").getOffset(); 70 71 pointerSize = db.lookupType("HeapRegion*").getSize(); 72 } 73 74 static public long grainBytes() { 75 return grainBytesField.getValue(); 76 } 77 78 public HeapRegion(Address addr) { 79 super(addr); 80 Address typeAddr = (addr instanceof OopHandle) ? addr.addOffsetToAsOopHandle(typeFieldOffset) 81 : addr.addOffsetTo(typeFieldOffset); 82 type = (HeapRegionType)VMObjectFactory.newObject(HeapRegionType.class, typeAddr); 83 } 84 85 public Address top() { 86 return topField.getValue(addr); 87 } 88 89 @Override 90 public List<MemRegion> getLiveRegions() { 91 List<MemRegion> res = new ArrayList<>(); 92 res.add(new MemRegion(bottom(), top())); 93 return res; 94 } 95 96 @Override 97 public long used() { 98 return top().minus(bottom()); 99 } 100 101 @Override 102 public long free() { 103 return end().minus(top()); 104 } 105 106 public boolean isFree() { 107 return type.isFree(); 108 } 109 110 public boolean isYoung() { 111 return type.isYoung(); 112 } 113 114 public boolean isHumongous() { 115 return type.isHumongous(); 116 } 117 118 public boolean isPinned() { 119 return type.isPinned(); 120 } 121 122 public boolean isOld() { 123 return type.isOld(); 124 } 125 126 public static long getPointerSize() { 127 return pointerSize; 128 } 129 130 public void printOn(PrintStream tty) { 131 tty.print("Region: " + bottom() + "," + top() + "," + end()); 132 tty.println(":" + type.typeAnnotation()); 133 } 134 }