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1 /*
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2 * Copyright 2000-2007 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.oops;
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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.utilities.*;
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30 import sun.jvm.hotspot.debugger.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.types.*;
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33 import sun.jvm.hotspot.memory.CompactingPermGenGen;
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34
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35 // Oop represents the superclass for all types of
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36 // objects in the HotSpot object heap.
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37
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38 public class Oop {
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39 static {
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40 VM.registerVMInitializedObserver(new Observer() {
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41 public void update(Observable o, Object data) {
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42 initialize(VM.getVM().getTypeDataBase());
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43 }
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44 });
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45 }
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46
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47 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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48 Type type = db.lookupType("oopDesc");
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49 mark = new CIntField(type.getCIntegerField("_mark"), 0);
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50 klass = new OopField(type.getOopField("_klass"), 0);
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51 headerSize = type.getSize();
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52 }
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53
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54 private OopHandle handle;
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55 private ObjectHeap heap;
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56
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57 Oop(OopHandle handle, ObjectHeap heap) {
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58 this.handle = handle;
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59 this.heap = heap;
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60 }
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61
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62 ObjectHeap getHeap() { return heap; }
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63
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64 /** Should not be used or needed by most clients outside this
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65 package; is needed, however, by {@link
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66 sun.jvm.hotspot.utilities.MarkBits}. */
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67 public OopHandle getHandle() { return handle; }
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68
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69 private static long headerSize;
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70 public static long getHeaderSize() { return headerSize; }
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71
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72 private static CIntField mark;
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73 private static OopField klass;
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74
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75 public boolean isShared() {
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76 return CompactingPermGenGen.isShared(handle);
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77 }
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78
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79 public boolean isSharedReadOnly() {
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80 return CompactingPermGenGen.isSharedReadOnly(handle);
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81 }
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82
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83 public boolean isSharedReadWrite() {
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84 return CompactingPermGenGen.isSharedReadWrite(handle);
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85 }
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86
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87 // Accessors for declared fields
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88 public Mark getMark() { return new Mark(getHandle()); }
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89 public Klass getKlass() { return (Klass) klass.getValue(this); }
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90
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91 public boolean isA(Klass k) {
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92 return getKlass().isSubtypeOf(k);
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93 }
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94
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95 // Returns the byte size of this object
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96 public long getObjectSize() {
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97 Klass k = getKlass();
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98 if (k instanceof InstanceKlass) {
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99 return ((InstanceKlass)k).getSizeHelper()
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100 * VM.getVM().getAddressSize();
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101 }
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102 // If it is not an instance, this method should be replaced.
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103 return getHeaderSize();
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104 }
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105
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106 // Type test operations
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107 public boolean isInstance() { return false; }
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108 public boolean isInstanceRef() { return false; }
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109 public boolean isArray() { return false; }
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110 public boolean isObjArray() { return false; }
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111 public boolean isTypeArray() { return false; }
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112 public boolean isSymbol() { return false; }
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113 public boolean isKlass() { return false; }
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114 public boolean isThread() { return false; }
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115 public boolean isMethod() { return false; }
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116 public boolean isMethodData() { return false; }
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117 public boolean isConstantPool() { return false; }
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118 public boolean isConstantPoolCache() { return false; }
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119 public boolean isCompiledICHolder() { return false; }
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120
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121 // Align the object size.
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122 public static long alignObjectSize(long size) {
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123 return VM.getVM().alignUp(size, VM.getVM().getMinObjAlignmentInBytes());
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124 }
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125
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126 // All vm's align longs, so pad out certain offsets.
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127 public static long alignObjectOffset(long offset) {
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128 return VM.getVM().alignUp(offset, VM.getVM().getBytesPerLong());
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129 }
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130
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131 public boolean equals(Object obj) {
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132 if (obj != null && (obj instanceof Oop)) {
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133 return getHandle().equals(((Oop) obj).getHandle());
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134 }
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135 return false;
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136 }
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137
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138 public int hashCode() { return getHandle().hashCode(); }
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139
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140 /** Identity hash in the target VM */
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141 public long identityHash() {
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142 Mark mark = getMark();
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143 if (mark.isUnlocked() && (!mark.hasNoHash())) {
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144 return (int) mark.hash();
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145 } else if (mark.isMarked()) {
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146 return (int) mark.hash();
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147 } else {
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148 return slowIdentityHash();
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149 }
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150 }
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151
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152 public long slowIdentityHash() {
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153 return VM.getVM().getObjectSynchronizer().identityHashValueFor(this);
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154 }
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155
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156 public void iterate(OopVisitor visitor, boolean doVMFields) {
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157 visitor.setObj(this);
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158 visitor.prologue();
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159 iterateFields(visitor, doVMFields);
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160 visitor.epilogue();
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161 }
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162
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163 void iterateFields(OopVisitor visitor, boolean doVMFields) {
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164 if (doVMFields) {
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165 visitor.doCInt(mark, true);
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166 visitor.doOop(klass, true);
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167 }
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168 }
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169
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170 public void print() { printOn(System.out); }
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171 public void printValue() { printValueOn(System.out); }
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172 public void printRaw() { printRawOn(System.out); }
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173
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174 public static void printOopValueOn(Oop obj, PrintStream tty) {
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175 if (obj == null) {
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176 tty.print("null");
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177 } else {
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178 obj.printValueOn(tty);
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179 tty.print(" @ " + obj.getHandle());
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180 }
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181 }
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182
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183 public static void printOopAddressOn(Oop obj, PrintStream tty) {
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184 if (obj == null) {
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185 tty.print("null");
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186 } else {
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187 tty.print(obj.getHandle().toString());
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188 }
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189 }
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190
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191 public void printOn(PrintStream tty) {
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192 OopPrinter printer = new OopPrinter(tty);
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193 iterate(printer, true);
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194 }
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195
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196 public void printValueOn(PrintStream tty) {
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197 try {
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198 tty.print("Oop for " + getKlass().getName().asString());
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199 } catch (java.lang.NullPointerException e) {
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200 tty.print("Oop");
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201 }
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202 }
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203
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204 public void printRawOn(PrintStream tty) {
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205 tty.print("Dumping raw memory for ");
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206 printValueOn(tty);
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207 tty.println();
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208 long size = getObjectSize() * 4;
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209 for (long i = 0; i < size; i += 4) {
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210 long memVal = getHandle().getCIntegerAt(i, 4, true);
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211 tty.println(Long.toHexString(memVal));
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212 }
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213 }
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214
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215 public boolean verify() { return true;}
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216
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217 // Package-private routine to speed up ObjectHeap.newOop
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218 static OopHandle getKlassForOopHandle(OopHandle handle) {
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219 if (handle == null) {
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220 return null;
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221 }
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222 return handle.getOopHandleAt(klass.getOffset());
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223 }
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224 };
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