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.util.ArrayList; 28 import java.util.List; 29 import java.util.Observable; 30 import java.util.Observer; 31 import sun.jvm.hotspot.debugger.Address; 32 import sun.jvm.hotspot.debugger.OopHandle; 33 import sun.jvm.hotspot.gc.shared.CompactibleSpace; 34 import sun.jvm.hotspot.memory.MemRegion; 35 import sun.jvm.hotspot.runtime.VM; 36 import sun.jvm.hotspot.runtime.VMObjectFactory; 37 import sun.jvm.hotspot.types.AddressField; 38 import sun.jvm.hotspot.types.CIntegerField; 39 import sun.jvm.hotspot.types.Type; 40 import sun.jvm.hotspot.types.TypeDataBase; 41 import sun.jvm.hotspot.utilities.Assert; 42 43 // Mirror class for HeapRegion. Currently we don't actually include 44 // any of its fields but only iterate over it. 45 46 public class HeapRegion extends CompactibleSpace { 47 // static int GrainBytes; 48 static private CIntegerField grainBytesField; 49 static private AddressField topField; 50 private static long typeFieldOffset; 51 private static long pointerSize; 52 53 private HeapRegionType type; 54 55 static { 56 VM.registerVMInitializedObserver(new Observer() { 57 public void update(Observable o, Object data) { 58 initialize(VM.getVM().getTypeDataBase()); 59 } 60 }); 61 } 62 63 static private synchronized void initialize(TypeDataBase db) { 64 Type t = db.lookupType("HeapRegion"); 65 66 grainBytesField = t.getCIntegerField("GrainBytes"); 67 topField = t.getAddressField("_top"); 68 typeFieldOffset = t.getField("_type").getOffset(); 69 70 pointerSize = db.lookupType("HeapRegion*").getSize(); 71 } 72 73 static public long grainBytes() { 74 return grainBytesField.getValue(); 75 } 76 77 public HeapRegion(Address addr) { 78 super(addr); 79 80 if (Assert.ASSERTS_ENABLED) { 81 Assert.that(addr instanceof OopHandle, "addr should be OopHandle"); 82 } 83 84 Address typeAddr = addr.addOffsetToAsOopHandle(typeFieldOffset); 85 type = (HeapRegionType)VMObjectFactory.newObject( 86 HeapRegionType.class, typeAddr); 87 } 88 89 public Address top() { 90 return topField.getValue(addr); 91 } 92 93 @Override 94 public List getLiveRegions() { 95 List res = new ArrayList(); 96 res.add(new MemRegion(bottom(), top())); 97 return res; 98 } 99 100 @Override 101 public long used() { 102 return top().minus(bottom()); 103 } 104 105 @Override 106 public long free() { 107 return end().minus(top()); 108 } 109 110 public boolean isFree() { 111 return type.isFree(); 112 } 113 114 public boolean isYoung() { 115 return type.isYoung(); 116 } 117 118 public boolean isHumongous() { 119 return type.isHumongous(); 120 } 121 122 public boolean isPinned() { 123 return type.isPinned(); 124 } 125 126 public boolean isOld() { 127 return type.isOld(); 128 } 129 130 public static long getPointerSize() { 131 return pointerSize; 132 } 133 }