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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.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.gc_interface.*;
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31 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*;
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32 import sun.jvm.hotspot.oops.*;
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33 import sun.jvm.hotspot.types.*;
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34 import sun.jvm.hotspot.runtime.*;
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35
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36
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37 public class Universe {
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38 private static AddressField collectedHeapField;
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39 private static VirtualConstructor heapConstructor;
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40 private static sun.jvm.hotspot.types.OopField mainThreadGroupField;
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41 private static sun.jvm.hotspot.types.OopField systemThreadGroupField;
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42
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43 // single dimensional primitive array klasses
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44 private static sun.jvm.hotspot.types.OopField boolArrayKlassObjField;
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45 private static sun.jvm.hotspot.types.OopField byteArrayKlassObjField;
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46 private static sun.jvm.hotspot.types.OopField charArrayKlassObjField;
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47 private static sun.jvm.hotspot.types.OopField intArrayKlassObjField;
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48 private static sun.jvm.hotspot.types.OopField shortArrayKlassObjField;
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49 private static sun.jvm.hotspot.types.OopField longArrayKlassObjField;
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50 private static sun.jvm.hotspot.types.OopField singleArrayKlassObjField;
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51 private static sun.jvm.hotspot.types.OopField doubleArrayKlassObjField;
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52
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53 // system obj array klass object
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54 private static sun.jvm.hotspot.types.OopField systemObjArrayKlassObjField;
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55
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56 static {
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57 VM.registerVMInitializedObserver(new Observer() {
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58 public void update(Observable o, Object data) {
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59 initialize(VM.getVM().getTypeDataBase());
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60 }
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61 });
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62 }
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63
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64 private static synchronized void initialize(TypeDataBase db) {
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65 Type type = db.lookupType("Universe");
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66
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67 collectedHeapField = type.getAddressField("_collectedHeap");
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68
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69 heapConstructor = new VirtualConstructor(db);
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70 heapConstructor.addMapping("GenCollectedHeap", GenCollectedHeap.class);
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71 heapConstructor.addMapping("ParallelScavengeHeap", ParallelScavengeHeap.class);
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72
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73 mainThreadGroupField = type.getOopField("_main_thread_group");
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74 systemThreadGroupField = type.getOopField("_system_thread_group");
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75
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76 boolArrayKlassObjField = type.getOopField("_boolArrayKlassObj");
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77 byteArrayKlassObjField = type.getOopField("_byteArrayKlassObj");
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78 charArrayKlassObjField = type.getOopField("_charArrayKlassObj");
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79 intArrayKlassObjField = type.getOopField("_intArrayKlassObj");
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80 shortArrayKlassObjField = type.getOopField("_shortArrayKlassObj");
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81 longArrayKlassObjField = type.getOopField("_longArrayKlassObj");
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82 singleArrayKlassObjField = type.getOopField("_singleArrayKlassObj");
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83 doubleArrayKlassObjField = type.getOopField("_doubleArrayKlassObj");
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84
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85 systemObjArrayKlassObjField = type.getOopField("_systemObjArrayKlassObj");
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86 }
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87
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88 public Universe() {
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89 }
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90
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91 public CollectedHeap heap() {
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92 try {
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93 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
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94 } catch (WrongTypeException e) {
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95 return new CollectedHeap(collectedHeapField.getValue());
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96 }
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97 }
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98
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99 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
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100 public boolean isIn(Address p) {
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101 return heap().isIn(p);
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102 }
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103
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104 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
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105 public boolean isInReserved(Address p) {
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106 return heap().isInReserved(p);
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107 }
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108
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109 private Oop newOop(OopHandle handle) {
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110 return VM.getVM().getObjectHeap().newOop(handle);
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111 }
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112
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113 public Oop mainThreadGroup() {
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114 return newOop(mainThreadGroupField.getValue());
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115 }
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116
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117 public Oop systemThreadGroup() {
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118 return newOop(systemThreadGroupField.getValue());
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119 }
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120
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121 public Oop systemObjArrayKlassObj() {
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122 return newOop(systemObjArrayKlassObjField.getValue());
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123 }
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124
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125 // iterate through the single dimensional primitive array klasses
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126 // refer to basic_type_classes_do(void f(klassOop)) in universe.cpp
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127 public void basicTypeClassesDo(SystemDictionary.ClassVisitor visitor) {
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128 visitor.visit((Klass)newOop(boolArrayKlassObjField.getValue()));
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129 visitor.visit((Klass)newOop(byteArrayKlassObjField.getValue()));
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130 visitor.visit((Klass)newOop(charArrayKlassObjField.getValue()));
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131 visitor.visit((Klass)newOop(intArrayKlassObjField.getValue()));
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132 visitor.visit((Klass)newOop(shortArrayKlassObjField.getValue()));
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133 visitor.visit((Klass)newOop(longArrayKlassObjField.getValue()));
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134 visitor.visit((Klass)newOop(singleArrayKlassObjField.getValue()));
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135 visitor.visit((Klass)newOop(doubleArrayKlassObjField.getValue()));
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136 }
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137
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138 public void print() { printOn(System.out); }
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139 public void printOn(PrintStream tty) {
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140 heap().printOn(tty);
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141 }
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142
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143 // Check whether an element of a typeArrayOop with the given type must be
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144 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this
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145 // strongly.
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146 public static boolean elementTypeShouldBeAligned(BasicType type) {
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147 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
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148 }
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149
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150 // Check whether an object field (static/non-static) of the given type must be
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151 // aligned 0 mod 8.
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152 public static boolean fieldTypeShouldBeAligned(BasicType type) {
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153 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
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154 }
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155 }
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