1 /* 2 * Copyright (c) 2000, 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.serial; 26 27 import java.io.*; 28 import java.util.*; 29 30 import sun.jvm.hotspot.debugger.*; 31 import sun.jvm.hotspot.gc.shared.*; 32 import sun.jvm.hotspot.runtime.*; 33 import sun.jvm.hotspot.types.*; 34 35 /** DefNewGeneration is a young generation containing eden, from- and 36 to-space. */ 37 38 public class DefNewGeneration extends Generation { 39 protected static AddressField edenSpaceField; 40 protected static AddressField fromSpaceField; 41 protected static AddressField toSpaceField; 42 43 static { 44 VM.registerVMInitializedObserver(new Observer() { 45 public void update(Observable o, Object data) { 46 initialize(VM.getVM().getTypeDataBase()); 47 } 48 }); 49 } 50 51 private static synchronized void initialize(TypeDataBase db) { 52 Type type = db.lookupType("DefNewGeneration"); 53 54 edenSpaceField = type.getAddressField("_eden_space"); 55 fromSpaceField = type.getAddressField("_from_space"); 56 toSpaceField = type.getAddressField("_to_space"); 57 } 58 59 public DefNewGeneration(Address addr) { 60 super(addr); 61 } 62 63 public Generation.Name kind() { 64 return Generation.Name.DEF_NEW; 65 } 66 67 // Accessing spaces 68 public ContiguousSpace eden() { 69 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, edenSpaceField.getValue(addr)); 70 } 71 72 public ContiguousSpace from() { 73 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, fromSpaceField.getValue(addr)); 74 } 75 76 public ContiguousSpace to() { 77 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, toSpaceField.getValue(addr)); 78 } 79 80 public long capacity() { return eden().capacity() + from().capacity(); /* to() is only used during scavenge */ } 81 public long used() { return eden().used() + from().used(); /* to() is only used during scavenge */ } 82 public long free() { return eden().free() + from().free(); /* to() is only used during scavenge */ } 83 public long contiguousAvailable() { return eden().free(); } 84 85 public String name() { 86 return "default new generation"; 87 } 88 89 public void spaceIterate(SpaceClosure blk, boolean usedOnly) { 90 blk.doSpace(eden()); 91 blk.doSpace(from()); 92 if (!usedOnly) { 93 blk.doSpace(to()); 94 } 95 } 96 97 public void liveRegionsIterate(LiveRegionsClosure closure) { 98 closure.doLiveRegions(eden()); 99 closure.doLiveRegions(from()); 100 } 101 102 public void printOn(PrintStream tty) { 103 tty.print(" eden"); 104 eden().printOn(tty); 105 tty.print("\n from"); 106 from().printOn(tty); 107 tty.print("\n to "); 108 to().printOn(tty); 109 } 110 }