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1 /*
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2 * Copyright 2004 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.runtime;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.oops.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 public class PerfMemory {
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33 private static AddressField startField;
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34 private static AddressField endField;
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35 private static AddressField topField;
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36 private static CIntegerField capacityField;
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37 private static AddressField prologueField;
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38 private static JIntField initializedField;
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39
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40 static {
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41 VM.registerVMInitializedObserver(new Observer() {
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42 public void update(Observable o, Object data) {
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43 initialize(VM.getVM().getTypeDataBase());
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44 }
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45 });
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46 }
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47
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48 private static synchronized void initialize(TypeDataBase db) {
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49 Type type = db.lookupType("PerfMemory");
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50 startField = type.getAddressField("_start");
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51 endField = type.getAddressField("_end");
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52 topField = type.getAddressField("_top");
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53 capacityField = type.getCIntegerField("_capacity");
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54 prologueField = type.getAddressField("_prologue");
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55 initializedField = type.getJIntField("_initialized");
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56 }
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57
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58 // Accessors
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59 public static Address start() {
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60 return startField.getValue();
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61 }
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62
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63 public static Address end() {
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64 return endField.getValue();
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65 }
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66
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67 public static Address top() {
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68 return topField.getValue();
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69 }
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70
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71 public static long capacity() {
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72 return capacityField.getValue();
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73 }
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74
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75 public static boolean initialized() {
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76 return ((int) initializedField.getValue()) != 0;
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77 }
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78
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79 public static PerfDataPrologue prologue() {
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80 return (PerfDataPrologue) VMObjectFactory.newObject(
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81 PerfDataPrologue.class, prologueField.getValue());
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82 }
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83
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84 public static boolean contains(Address addr) {
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85 return start() != null &&
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86 addr.minus(start()) >= 0 &&
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87 end().minus(addr) > 0;
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88 }
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89
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90 // an interface supplied to iterate PerfDataEntries
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91 public static interface PerfDataEntryVisitor {
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92 // returns false to stop the iteration
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93 public boolean visit(PerfDataEntry pde);
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94 }
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95
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96 public static void iterate(PerfDataEntryVisitor visitor) {
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97 PerfDataPrologue header = prologue();
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98 int off = header.entryOffset();
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99 int num = header.numEntries();
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100 Address addr = header.getAddress();
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101
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102 for (int i = 0; i < num; i++) {
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103 PerfDataEntry pde = (PerfDataEntry) VMObjectFactory.newObject(
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104 PerfDataEntry.class, addr.addOffsetTo(off));
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105 off += pde.entryLength();
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106 if (visitor.visit(pde) == false) return;
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107 }
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108 }
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109 }
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