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1 /*
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2 * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.memory;
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26
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27 import java.io.*;
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28 import java.util.*;
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29
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.types.*;
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33
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34 /** DefNewGeneration is a young generation containing eden, from- and
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35 to-space. */
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36
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37 public class DefNewGeneration extends Generation {
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38 protected static AddressField edenSpaceField;
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39 protected static AddressField fromSpaceField;
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40 protected static AddressField toSpaceField;
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41
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42 static {
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43 VM.registerVMInitializedObserver(new Observer() {
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44 public void update(Observable o, Object data) {
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45 initialize(VM.getVM().getTypeDataBase());
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46 }
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47 });
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48 }
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49
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50 private static synchronized void initialize(TypeDataBase db) {
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51 Type type = db.lookupType("DefNewGeneration");
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52
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53 edenSpaceField = type.getAddressField("_eden_space");
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54 fromSpaceField = type.getAddressField("_from_space");
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55 toSpaceField = type.getAddressField("_to_space");
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56 }
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57
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58 public DefNewGeneration(Address addr) {
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59 super(addr);
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60 }
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61
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62 public Generation.Name kind() {
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63 return Generation.Name.DEF_NEW;
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64 }
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65
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66 // Accessing spaces
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67 public EdenSpace eden() {
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68 return (EdenSpace) VMObjectFactory.newObject(EdenSpace.class, edenSpaceField.getValue(addr));
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69 }
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70
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71 public ContiguousSpace from() {
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72 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, fromSpaceField.getValue(addr));
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73 }
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74
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75 public ContiguousSpace to() {
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76 return (ContiguousSpace) VMObjectFactory.newObject(ContiguousSpace.class, toSpaceField.getValue(addr));
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77 }
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78
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79 public long capacity() { return eden().capacity() + from().capacity(); /* to() is only used during scavenge */ }
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80 public long used() { return eden().used() + from().used(); /* to() is only used during scavenge */ }
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81 public long free() { return eden().free() + from().free(); /* to() is only used during scavenge */ }
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82 public long contiguousAvailable() { return eden().free(); }
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83
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84 public String name() {
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85 return "default new generation";
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86 }
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87
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88 public void spaceIterate(SpaceClosure blk, boolean usedOnly) {
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89 blk.doSpace(eden());
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90 blk.doSpace(from());
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91 if (!usedOnly) {
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92 blk.doSpace(to());
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93 }
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94 }
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95
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96 public void printOn(PrintStream tty) {
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97 tty.print(" eden");
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98 eden().printOn(tty);
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99 tty.print(" from");
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100 from().printOn(tty);
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101 tty.print(" to ");
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102 to().printOn(tty);
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103 }
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104 }
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