1 /* 2 * Copyright (c) 2000, 2008, 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.memory; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.runtime.*; 32 import sun.jvm.hotspot.types.*; 33 34 /** DefNewGeneration is a young generation containing eden, from- and 35 to-space. */ 36 37 public class DefNewGeneration extends Generation { 38 protected static AddressField edenSpaceField; 39 protected static AddressField fromSpaceField; 40 protected static AddressField toSpaceField; 41 42 static { 43 VM.registerVMInitializedObserver(new Observer() { 44 public void update(Observable o, Object data) { 45 initialize(VM.getVM().getTypeDataBase()); 46 } 47 }); 48 } 49 50 private static synchronized void initialize(TypeDataBase db) { 51 Type type = db.lookupType("DefNewGeneration"); 52 53 edenSpaceField = type.getAddressField("_eden_space"); 54 fromSpaceField = type.getAddressField("_from_space"); 55 toSpaceField = type.getAddressField("_to_space"); 56 } 57 58 public DefNewGeneration(Address addr) { 59 super(addr); 60 } 61 62 public Generation.Name kind() { 63 return Generation.Name.DEF_NEW; 64 } 65 66 // Accessing spaces 67 public ContiguousSpace eden() { 68 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, edenSpaceField.getValue(addr)); 69 } 70 71 public ContiguousSpace from() { 72 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, fromSpaceField.getValue(addr)); 73 } 74 75 public ContiguousSpace to() { 76 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, toSpaceField.getValue(addr)); 77 } 78 79 public long capacity() { return eden().capacity() + from().capacity(); /* to() is only used during scavenge */ } 80 public long used() { return eden().used() + from().used(); /* to() is only used during scavenge */ } 81 public long free() { return eden().free() + from().free(); /* to() is only used during scavenge */ } 82 public long contiguousAvailable() { return eden().free(); } 83 84 public String name() { 85 return "default new generation"; 86 } 87 88 public void spaceIterate(SpaceClosure blk, boolean usedOnly) { 89 blk.doSpace(eden()); 90 blk.doSpace(from()); 91 if (!usedOnly) { 92 blk.doSpace(to()); 93 } 94 } 95 96 public void printOn(PrintStream tty) { 97 tty.print(" eden"); 98 eden().printOn(tty); 99 tty.print("\n from"); 100 from().printOn(tty); 101 tty.print("\n to "); 102 to().printOn(tty); 103 } 104 }