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1 /*
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2 * Copyright 2000-2005 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.code;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.memory.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32 import sun.jvm.hotspot.utilities.*;
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33
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34 public class CodeCache {
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35 private static AddressField heapField;
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36 private static VirtualConstructor virtualConstructor;
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37
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38 private CodeHeap heap;
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39
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40 static {
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41 VM.registerVMInitializedObserver(new Observer() {
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42 public void update(Observable o, Object data) {
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43 initialize(VM.getVM().getTypeDataBase());
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44 }
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45 });
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46 }
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47
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48 private static synchronized void initialize(TypeDataBase db) {
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49 Type type = db.lookupType("CodeCache");
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50
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51 heapField = type.getAddressField("_heap");
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52
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53 virtualConstructor = new VirtualConstructor(db);
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54 // Add mappings for all possible CodeBlob subclasses
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55 virtualConstructor.addMapping("BufferBlob", BufferBlob.class);
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56 virtualConstructor.addMapping("nmethod", NMethod.class);
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57 virtualConstructor.addMapping("RuntimeStub", RuntimeStub.class);
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58 virtualConstructor.addMapping("SafepointBlob", SafepointBlob.class);
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59 virtualConstructor.addMapping("DeoptimizationBlob", DeoptimizationBlob.class);
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60 if (VM.getVM().isServerCompiler()) {
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61 virtualConstructor.addMapping("ExceptionBlob", ExceptionBlob.class);
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62 virtualConstructor.addMapping("UncommonTrapBlob", UncommonTrapBlob.class);
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63 }
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64 }
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65
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66 public CodeCache() {
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67 heap = (CodeHeap) VMObjectFactory.newObject(CodeHeap.class, heapField.getValue());
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68 }
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69
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70 public boolean contains(Address p) {
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71 return getHeap().contains(p);
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72 }
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73
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74 /** When VM.getVM().isDebugging() returns true, this behaves like
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75 findBlobUnsafe */
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76 public CodeBlob findBlob(Address start) {
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77 CodeBlob result = findBlobUnsafe(start);
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78 if (result == null) return null;
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79 if (VM.getVM().isDebugging()) {
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80 return result;
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81 }
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82 // We could potientially look up non_entrant methods
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83 // NOTE: this is effectively a "guarantee", and is slightly different from the one in the VM
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84 if (Assert.ASSERTS_ENABLED) {
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85 Assert.that(!(result.isZombie() || result.isLockedByVM()), "unsafe access to zombie method");
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86 }
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87 return result;
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88 }
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89
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90 public CodeBlob findBlobUnsafe(Address start) {
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91 CodeBlob result = null;
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92
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93 try {
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94 result = (CodeBlob) virtualConstructor.instantiateWrapperFor(getHeap().findStart(start));
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95 }
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96 catch (WrongTypeException wte) {
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97 Address cbAddr = null;
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98 try {
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99 cbAddr = getHeap().findStart(start);
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100 }
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101 catch (Exception findEx) {
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102 findEx.printStackTrace();
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103 }
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104
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105 String message = "Couldn't deduce type of CodeBlob ";
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106 if (cbAddr != null) {
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107 message = message + "@" + cbAddr + " ";
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108 }
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109 message = message + "for PC=" + start;
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110
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111 throw new RuntimeException(message, wte);
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112 }
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113 if (result == null) return null;
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114 if (Assert.ASSERTS_ENABLED) {
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115 // The HeapBlock that contains this blob is outside of the blob
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116 // but it shouldn't be an error to find a blob based on the
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117 // pointer to the HeapBlock.
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118 Assert.that(result.blobContains(start) || result.blobContains(start.addOffsetTo(8)),
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119 "found wrong CodeBlob");
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120 }
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121 return result;
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122 }
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123
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124 public NMethod findNMethod(Address start) {
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125 CodeBlob cb = findBlob(start);
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126 if (Assert.ASSERTS_ENABLED) {
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127 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
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128 }
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129 return (NMethod) cb;
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130 }
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131
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132 public NMethod findNMethodUnsafe(Address start) {
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133 CodeBlob cb = findBlobUnsafe(start);
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134 if (Assert.ASSERTS_ENABLED) {
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135 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
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136 }
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137 return (NMethod) cb;
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138 }
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139
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140 /** Routine for instantiating appropriately-typed wrapper for a
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141 CodeBlob. Used by CodeCache, Runtime1, etc. */
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142 public CodeBlob createCodeBlobWrapper(Address codeBlobAddr) {
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143 try {
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144 return (CodeBlob) virtualConstructor.instantiateWrapperFor(codeBlobAddr);
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145 }
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146 catch (Exception e) {
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147 String message = "Unable to deduce type of CodeBlob from address " + codeBlobAddr +
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148 " (expected type nmethod, RuntimeStub, ";
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149 if (VM.getVM().isClientCompiler()) {
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150 message = message + " or ";
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151 }
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152 message = message + "SafepointBlob";
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153 if (VM.getVM().isServerCompiler()) {
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154 message = message + ", DeoptimizationBlob, or ExceptionBlob";
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155 }
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156 message = message + ")";
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157 throw new RuntimeException(message);
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158 }
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159 }
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160
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161 public void iterate(CodeCacheVisitor visitor) {
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162 CodeHeap heap = getHeap();
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163 Address ptr = heap.begin();
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164 Address end = heap.end();
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165
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166 visitor.prologue(ptr, end);
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167 CodeBlob lastBlob = null;
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168 while (ptr != null && ptr.lessThan(end)) {
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169 try {
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170 CodeBlob blob = findBlobUnsafe(ptr);
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171 if (blob != null) {
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172 visitor.visit(blob);
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173 if (blob == lastBlob) {
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174 throw new InternalError("saw same blob twice");
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175 }
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176 lastBlob = blob;
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177 }
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178 } catch (RuntimeException e) {
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179 e.printStackTrace();
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180 }
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181 Address next = heap.nextBlock(ptr);
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182 if (next != null && next.lessThan(ptr)) {
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183 throw new InternalError("pointer moved backwards");
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184 }
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185 ptr = next;
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186 }
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187 visitor.epilogue();
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188 }
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189
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190 //--------------------------------------------------------------------------------
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191 // Internals only below this point
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192 //
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193
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194 private CodeHeap getHeap() {
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195 return heap;
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196 }
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197 }
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