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1 /*
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2 * Copyright 2000-2003 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 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.types.*;
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31 import sun.jvm.hotspot.runtime.*;
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32
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33 /** <P> A Space describes a heap area. Class Space is an abstract base
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34 class. </P>
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35
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36 <P> Space supports allocation, size computation and GC support is
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37 provided. </P>
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38
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39 <P> Invariant: bottom() and end() are on page_size boundaries and: </P>
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40
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41 <P> bottom() <= top() <= end() </P>
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42
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43 <P> top() is inclusive and end() is exclusive. </P> */
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44
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45 public abstract class Space extends VMObject {
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46 private static AddressField bottomField;
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47 private static AddressField endField;
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48
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49 static {
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50 VM.registerVMInitializedObserver(new Observer() {
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51 public void update(Observable o, Object data) {
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52 initialize(VM.getVM().getTypeDataBase());
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53 }
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54 });
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55 }
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56
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57 private static synchronized void initialize(TypeDataBase db) {
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58 Type type = db.lookupType("Space");
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59
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60 bottomField = type.getAddressField("_bottom");
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61 endField = type.getAddressField("_end");
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62 }
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63
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64 public Space(Address addr) {
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65 super(addr);
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66 }
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67
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68 public Address bottom() { return bottomField.getValue(addr); }
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69 public Address end() { return endField.getValue(addr); }
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70
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71 /** Returns a subregion of the space containing all the objects in
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72 the space. */
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73 public MemRegion usedRegion() {
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74 return new MemRegion(bottom(), end());
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75 }
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76
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77 /** Support for iteration over heap -- not sure how this will
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78 interact with GC in reflective system, but necessary for the
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79 debugging mechanism */
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80 public OopHandle bottomAsOopHandle() {
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81 return bottomField.getOopHandle(addr);
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82 }
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83
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84 /** Support for iteration over heap -- not sure how this will
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85 interact with GC in reflective system, but necessary for the
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86 debugging mechanism */
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87 public OopHandle nextOopHandle(OopHandle handle, long size) {
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88 return handle.addOffsetToAsOopHandle(size);
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89 }
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90
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91 /** returns all MemRegions where live objects are */
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92 public abstract List/*<MemRegion>*/ getLiveRegions();
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93
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94 /** Returned value is in bytes */
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95 public long capacity() { return end().minus(bottom()); }
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96 /** Returned value is in bytes */
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97 public abstract long used();
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98 /** Returned value is in bytes */
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99 public abstract long free();
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100
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101 /** Testers */
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102 public boolean contains(Address p) {
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103 return (bottom().lessThanOrEqual(p) && end().greaterThan(p));
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104 }
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105
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106 public void print() { printOn(System.out); }
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107 public void printOn(PrintStream tty) {
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108 tty.print(" space capacity = ");
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109 tty.print(capacity());
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110 tty.print(", ");
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111 tty.print((double) used() * 100.0/ capacity());
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112 tty.print(" used");
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113 }
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114 }
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