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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
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.gc_interface.*;
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32 import sun.jvm.hotspot.runtime.*;
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33 import sun.jvm.hotspot.types.*;
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34 import sun.jvm.hotspot.utilities.*;
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35
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36 public class GenCollectedHeap extends SharedHeap {
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37 private static CIntegerField nGensField;
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38 private static long gensOffset;
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39 private static AddressField genSpecsField;
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40
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41 private static GenerationFactory genFactory;
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42
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43 static {
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44 VM.registerVMInitializedObserver(new Observer() {
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45 public void update(Observable o, Object data) {
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46 initialize(VM.getVM().getTypeDataBase());
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47 }
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48 });
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49 }
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50
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51 private static synchronized void initialize(TypeDataBase db) {
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52 Type type = db.lookupType("GenCollectedHeap");
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53
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54 nGensField = type.getCIntegerField("_n_gens");
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55 gensOffset = type.getField("_gens").getOffset();
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56 genSpecsField = type.getAddressField("_gen_specs");
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57
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58 genFactory = new GenerationFactory();
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59 }
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60
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61 public GenCollectedHeap(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 int nGens() {
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66 return (int) nGensField.getValue(addr);
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67 }
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68
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69 public Generation getGen(int i) {
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70 if (Assert.ASSERTS_ENABLED) {
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71 Assert.that((i >= 0) && (i < nGens()), "Index " + i +
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72 " out of range (should be between 0 and " + nGens() + ")");
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73 }
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74
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75 if ((i < 0) || (i >= nGens())) {
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76 return null;
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77 }
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78
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79 Address genAddr = addr.getAddressAt(gensOffset +
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80 (i * VM.getVM().getAddressSize()));
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81 return genFactory.newObject(addr.getAddressAt(gensOffset +
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82 (i * VM.getVM().getAddressSize())));
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83 }
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84
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85 public boolean isIn(Address a) {
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86 for (int i = 0; i < nGens(); i++) {
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87 Generation gen = getGen(i);
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88 if (gen.isIn(a)) {
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89 return true;
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90 }
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91 }
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92
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93 return permGen().isIn(a);
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94 }
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95
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96 public long capacity() {
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97 long capacity = 0;
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98 for (int i = 0; i < nGens(); i++) {
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99 capacity += getGen(i).capacity();
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100 }
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101 return capacity;
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102 }
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103
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104 public long used() {
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105 long used = 0;
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106 for (int i = 0; i < nGens(); i++) {
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107 used += getGen(i).used();
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108 }
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109 return used;
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110 }
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111
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112 /** Package-private access to GenerationSpecs */
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113 GenerationSpec spec(int level) {
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114 if (Assert.ASSERTS_ENABLED) {
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115 Assert.that((level >= 0) && (level < nGens()), "Index " + level +
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116 " out of range (should be between 0 and " + nGens() + ")");
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117 }
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118
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119 if ((level < 0) || (level >= nGens())) {
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120 return null;
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121 }
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122
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123 Address ptrList = genSpecsField.getValue(addr);
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124 if (ptrList == null) {
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125 return null;
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126 }
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127 return (GenerationSpec)
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128 VMObjectFactory.newObject(GenerationSpec.class,
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129 ptrList.getAddressAt(level * VM.getVM().getAddressSize()));
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130 }
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131
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132 public CollectedHeapName kind() {
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133 return CollectedHeapName.GEN_COLLECTED_HEAP;
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134 }
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135
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136 public void printOn(PrintStream tty) {
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137 for (int i = 0; i < nGens(); i++) {
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138 tty.print("Gen " + i + ": ");
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139 getGen(i).printOn(tty);
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140 tty.println("Invocations: " + getGen(i).invocations());
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141 tty.println();
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142 }
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143 permGen().printOn(tty);
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144 tty.println("Invocations: " + permGen().invocations());
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145 }
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146 }
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