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1 /*
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2 * Copyright 2000-2006 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.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 /** <P> ThreadLocalAllocBuffer: a descriptor for thread-local storage
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33 used by the threads for allocation. </P>
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34
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35 <P> It is thread-private at any time, but maybe multiplexed over
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36 time across multiple threads. </P> */
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37
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38 public class ThreadLocalAllocBuffer extends VMObject {
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39 private static AddressField startField;
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40 private static AddressField topField;
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41 private static AddressField endField;
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42 private static CIntegerField desired_sizeField;
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43
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44 static {
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45 VM.registerVMInitializedObserver(new Observer() {
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46 public void update(Observable o, Object data) {
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47 initialize(VM.getVM().getTypeDataBase());
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48 }
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49 });
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50 }
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51
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52 private static synchronized void initialize(TypeDataBase db) {
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53 Type type = db.lookupType("ThreadLocalAllocBuffer");
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54
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55 startField = type.getAddressField("_start");
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56 topField = type.getAddressField("_top");
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57 endField = type.getAddressField("_end");
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58 desired_sizeField = type.getCIntegerField("_desired_size");
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59 }
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60
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61 public ThreadLocalAllocBuffer(Address addr) {
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62 super(addr);
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63 }
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64
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65 public Address start() { return startField.getValue(addr); }
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66 public Address end() { return endField.getValue(addr); }
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67 public Address top() { return topField.getValue(addr); }
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68
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69 /** Support for iteration over heap -- not sure how this will
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70 interact with GC in reflective system, but necessary for the
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71 debugging mechanism */
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72 public OopHandle startAsOopHandle() {
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73 return startField.getOopHandle(addr);
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74 }
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75
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76 /** Support for iteration over heap -- not sure how this will
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77 interact with GC in reflective system, but necessary for the
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78 debugging mechanism */
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79 public OopHandle nextOopHandle(OopHandle handle, long size) {
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80 return handle.addOffsetToAsOopHandle(size);
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81 }
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82
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83 // public int size(); // FIXME: must adjust this to be in bytes
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84 // public int availableSize(); // FIXME: must adjust this to be in bytes
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85 public void print() {
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86 printOn(System.out);
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87 }
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88
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89 public boolean contains(Address p) {
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90 if (top() == null) {
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91 return false;
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92 }
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93 return (start().lessThanOrEqual(p) && top().greaterThan(p));
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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.println(" [" + start() + "," +
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98 top() + "," + end() + ")");
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99 }
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100 }
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