Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/oops/OopUtilities.java @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | cfa2c82f4c04 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.oops; | |
| 26 | |
| 27 import java.util.*; | |
| 28 | |
| 29 import sun.jvm.hotspot.debugger.*; | |
| 30 import sun.jvm.hotspot.memory.*; | |
| 31 import sun.jvm.hotspot.runtime.*; | |
| 32 import sun.jvm.hotspot.types.TypeDataBase; | |
| 33 import sun.jvm.hotspot.utilities.*; | |
| 34 import sun.jvm.hotspot.jdi.JVMTIThreadState; | |
| 35 | |
| 36 /** A utility class encapsulating useful oop operations */ | |
| 37 | |
| 38 public class OopUtilities implements /* imports */ JVMTIThreadState { | |
| 39 | |
| 40 // FIXME: access should be synchronized and cleared when VM is | |
| 41 // resumed | |
| 42 // String fields | |
| 43 private static IntField offsetField; | |
| 44 private static IntField countField; | |
| 45 private static OopField valueField; | |
| 46 // ThreadGroup fields | |
| 47 private static OopField threadGroupParentField; | |
| 48 private static OopField threadGroupNameField; | |
| 49 private static IntField threadGroupNThreadsField; | |
| 50 private static OopField threadGroupThreadsField; | |
| 51 private static IntField threadGroupNGroupsField; | |
| 52 private static OopField threadGroupGroupsField; | |
| 53 // Thread fields | |
| 54 private static OopField threadNameField; | |
| 55 private static OopField threadGroupField; | |
| 56 private static LongField threadEETopField; | |
| 57 // threadStatus field is new since 1.5 | |
| 58 private static IntField threadStatusField; | |
| 59 // parkBlocker field is new since 1.6 | |
| 60 private static OopField threadParkBlockerField; | |
| 61 | |
| 62 // possible values of java_lang_Thread::ThreadStatus | |
| 63 private static int THREAD_STATUS_NEW; | |
| 64 /* | |
| 65 Other enum constants are not needed as of now. Uncomment these as and when needed. | |
| 66 | |
| 67 private static int THREAD_STATUS_RUNNABLE; | |
| 68 private static int THREAD_STATUS_SLEEPING; | |
| 69 private static int THREAD_STATUS_IN_OBJECT_WAIT; | |
| 70 private static int THREAD_STATUS_IN_OBJECT_WAIT_TIMED; | |
| 71 private static int THREAD_STATUS_PARKED; | |
| 72 private static int THREAD_STATUS_PARKED_TIMED; | |
| 73 private static int THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER; | |
| 74 private static int THREAD_STATUS_TERMINATED; | |
| 75 */ | |
| 76 | |
| 77 // java.util.concurrent.locks.AbstractOwnableSynchronizer fields | |
| 78 private static OopField absOwnSyncOwnerThreadField; | |
| 79 | |
| 80 static { | |
| 81 VM.registerVMInitializedObserver(new Observer() { | |
| 82 public void update(Observable o, Object data) { | |
| 83 initialize(VM.getVM().getTypeDataBase()); | |
| 84 } | |
| 85 }); | |
| 86 } | |
| 87 | |
| 88 private static synchronized void initialize(TypeDataBase db) { | |
| 89 // FIXME: don't need this observer; however, do need a VM resumed | |
| 90 // and suspended observer to refetch fields | |
| 91 } | |
| 92 | |
| 93 public static String charArrayToString(TypeArray charArray) { | |
| 94 if (charArray == null) { | |
| 95 return null; | |
| 96 } | |
| 97 return charArrayToString(charArray, 0, (int) charArray.getLength()); | |
| 98 } | |
| 99 | |
| 100 public static String charArrayToString(TypeArray charArray, int offset, int length) { | |
| 101 if (charArray == null) { | |
| 102 return null; | |
| 103 } | |
| 104 final int limit = offset + length; | |
| 105 if (Assert.ASSERTS_ENABLED) { | |
| 106 Assert.that(offset >= 0 && limit <= charArray.getLength(), "out of bounds"); | |
| 107 } | |
| 108 StringBuffer buf = new StringBuffer(length); | |
| 109 for (int i = offset; i < limit; i++) { | |
| 110 buf.append(charArray.getCharAt(i)); | |
| 111 } | |
| 112 return buf.toString(); | |
| 113 } | |
| 114 | |
| 3939 | 115 public static String escapeString(String s) { |
| 116 StringBuilder sb = null; | |
| 117 for (int index = 0; index < s.length(); index++) { | |
| 118 char value = s.charAt(index); | |
| 119 if (value >= 32 && value < 127 || value == '\'' || value == '\\') { | |
| 120 if (sb != null) { | |
| 121 sb.append(value); | |
| 122 } | |
| 123 } else { | |
| 124 if (sb == null) { | |
| 125 sb = new StringBuilder(s.length() * 2); | |
| 126 sb.append(s, 0, index); | |
| 127 } | |
| 128 sb.append("\\u"); | |
| 129 if (value < 0x10) sb.append("000"); | |
| 130 else if (value < 0x100) sb.append("00"); | |
| 131 else if (value < 0x1000) sb.append("0"); | |
| 132 sb.append(Integer.toHexString(value)); | |
| 133 } | |
| 134 } | |
| 135 if (sb != null) { | |
| 136 return sb.toString(); | |
| 137 } | |
| 138 return s; | |
| 139 } | |
| 140 | |
| 0 | 141 public static String stringOopToString(Oop stringOop) { |
| 142 if (offsetField == null) { | |
| 143 InstanceKlass k = (InstanceKlass) stringOop.getKlass(); | |
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144 offsetField = (IntField) k.findField("offset", "I"); // optional |
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145 countField = (IntField) k.findField("count", "I"); // optional |
| 0 | 146 valueField = (OopField) k.findField("value", "[C"); |
| 147 if (Assert.ASSERTS_ENABLED) { | |
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148 Assert.that(valueField != null, "Field \'value\' of java.lang.String not found"); |
| 0 | 149 } |
| 150 } | |
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151 if (offsetField != null && countField != null) { |
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152 return charArrayToString((TypeArray) valueField.getValue(stringOop), |
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153 offsetField.getValue(stringOop), |
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154 countField.getValue(stringOop)); |
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155 } |
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156 return charArrayToString((TypeArray) valueField.getValue(stringOop)); |
| 0 | 157 } |
| 158 | |
| 3939 | 159 public static String stringOopToEscapedString(Oop stringOop) { |
| 160 return escapeString(stringOopToString(stringOop)); | |
| 161 } | |
| 162 | |
| 0 | 163 private static void initThreadGroupFields() { |
| 164 if (threadGroupParentField == null) { | |
| 165 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 166 InstanceKlass k = sysDict.getThreadGroupKlass(); | |
| 167 threadGroupParentField = (OopField) k.findField("parent", "Ljava/lang/ThreadGroup;"); | |
| 168 threadGroupNameField = (OopField) k.findField("name", "Ljava/lang/String;"); | |
| 169 threadGroupNThreadsField = (IntField) k.findField("nthreads", "I"); | |
| 170 threadGroupThreadsField = (OopField) k.findField("threads", "[Ljava/lang/Thread;"); | |
| 171 threadGroupNGroupsField = (IntField) k.findField("ngroups", "I"); | |
| 172 threadGroupGroupsField = (OopField) k.findField("groups", "[Ljava/lang/ThreadGroup;"); | |
| 173 if (Assert.ASSERTS_ENABLED) { | |
| 174 Assert.that(threadGroupParentField != null && | |
| 175 threadGroupNameField != null && | |
| 176 threadGroupNThreadsField != null && | |
| 177 threadGroupThreadsField != null && | |
| 178 threadGroupNGroupsField != null && | |
| 179 threadGroupGroupsField != null, "must find all java.lang.ThreadGroup fields"); | |
| 180 } | |
| 181 } | |
| 182 } | |
| 183 | |
| 184 public static Oop threadGroupOopGetParent(Oop threadGroupOop) { | |
| 185 initThreadGroupFields(); | |
| 186 return threadGroupParentField.getValue(threadGroupOop); | |
| 187 } | |
| 188 | |
| 189 public static String threadGroupOopGetName(Oop threadGroupOop) { | |
| 190 initThreadGroupFields(); | |
| 191 return stringOopToString(threadGroupNameField.getValue(threadGroupOop)); | |
| 192 } | |
| 193 | |
| 194 public static Oop[] threadGroupOopGetThreads(Oop threadGroupOop) { | |
| 195 initThreadGroupFields(); | |
| 196 int nthreads = threadGroupNThreadsField.getValue(threadGroupOop); | |
| 197 Oop[] result = new Oop[nthreads]; | |
| 198 ObjArray threads = (ObjArray) threadGroupThreadsField.getValue(threadGroupOop); | |
| 199 for (int i = 0; i < nthreads; i++) { | |
| 200 result[i] = threads.getObjAt(i); | |
| 201 } | |
| 202 return result; | |
| 203 } | |
| 204 | |
| 205 public static Oop[] threadGroupOopGetGroups(Oop threadGroupOop) { | |
| 206 initThreadGroupFields(); | |
| 207 int ngroups = threadGroupNGroupsField.getValue(threadGroupOop); | |
| 208 Oop[] result = new Oop[ngroups]; | |
| 209 ObjArray groups = (ObjArray) threadGroupGroupsField.getValue(threadGroupOop); | |
| 210 for (int i = 0; i < ngroups; i++) { | |
| 211 result[i] = groups.getObjAt(i); | |
| 212 } | |
| 213 return result; | |
| 214 } | |
| 215 | |
| 216 private static void initThreadFields() { | |
| 217 if (threadNameField == null) { | |
| 218 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 219 InstanceKlass k = sysDict.getThreadKlass(); | |
| 220 threadNameField = (OopField) k.findField("name", "[C"); | |
| 221 threadGroupField = (OopField) k.findField("group", "Ljava/lang/ThreadGroup;"); | |
| 222 threadEETopField = (LongField) k.findField("eetop", "J"); | |
| 223 threadStatusField = (IntField) k.findField("threadStatus", "I"); | |
| 224 threadParkBlockerField = (OopField) k.findField("parkBlocker", | |
| 225 "Ljava/lang/Object;"); | |
| 226 TypeDataBase db = VM.getVM().getTypeDataBase(); | |
| 227 THREAD_STATUS_NEW = db.lookupIntConstant("java_lang_Thread::NEW").intValue(); | |
| 228 /* | |
| 229 Other enum constants are not needed as of now. Uncomment these as and when needed. | |
| 230 | |
| 231 THREAD_STATUS_RUNNABLE = db.lookupIntConstant("java_lang_Thread::RUNNABLE").intValue(); | |
| 232 THREAD_STATUS_SLEEPING = db.lookupIntConstant("java_lang_Thread::SLEEPING").intValue(); | |
| 233 THREAD_STATUS_IN_OBJECT_WAIT = db.lookupIntConstant("java_lang_Thread::IN_OBJECT_WAIT").intValue(); | |
| 234 THREAD_STATUS_IN_OBJECT_WAIT_TIMED = db.lookupIntConstant("java_lang_Thread::IN_OBJECT_WAIT_TIMED").intValue(); | |
| 235 THREAD_STATUS_PARKED = db.lookupIntConstant("java_lang_Thread::PARKED").intValue(); | |
| 236 THREAD_STATUS_PARKED_TIMED = db.lookupIntConstant("java_lang_Thread::PARKED_TIMED").intValue(); | |
| 237 THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER = db.lookupIntConstant("java_lang_Thread::BLOCKED_ON_MONITOR_ENTER").intValue(); | |
| 238 THREAD_STATUS_TERMINATED = db.lookupIntConstant("java_lang_Thread::TERMINATED").intValue(); | |
| 239 */ | |
| 240 | |
| 241 if (Assert.ASSERTS_ENABLED) { | |
| 242 // it is okay to miss threadStatusField, because this was | |
| 243 // introduced only in 1.5 JDK. | |
| 244 Assert.that(threadNameField != null && | |
| 245 threadGroupField != null && | |
| 246 threadEETopField != null, "must find all java.lang.Thread fields"); | |
| 247 } | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 public static Oop threadOopGetThreadGroup(Oop threadOop) { | |
| 252 initThreadFields(); | |
| 253 return threadGroupField.getValue(threadOop); | |
| 254 } | |
| 255 | |
| 256 public static String threadOopGetName(Oop threadOop) { | |
| 257 initThreadFields(); | |
| 258 return charArrayToString((TypeArray) threadNameField.getValue(threadOop)); | |
| 259 } | |
| 260 | |
| 261 /** May return null if, e.g., thread was not started */ | |
| 262 public static JavaThread threadOopGetJavaThread(Oop threadOop) { | |
| 263 initThreadFields(); | |
| 264 Address addr = threadOop.getHandle().getAddressAt(threadEETopField.getOffset()); | |
| 265 if (addr == null) { | |
| 266 return null; | |
| 267 } | |
| 268 return VM.getVM().getThreads().createJavaThreadWrapper(addr); | |
| 269 } | |
| 270 | |
| 271 /** returns value of java.lang.Thread.threadStatus field */ | |
| 272 public static int threadOopGetThreadStatus(Oop threadOop) { | |
| 273 initThreadFields(); | |
| 274 // The threadStatus is only present starting in 1.5 | |
| 275 if (threadStatusField != null) { | |
| 276 return (int) threadStatusField.getValue(threadOop); | |
| 277 } else { | |
| 278 // All we can easily figure out is if it is alive, but that is | |
| 279 // enough info for a valid unknown status. | |
| 280 JavaThread thr = threadOopGetJavaThread(threadOop); | |
| 281 if (thr == null) { | |
| 282 // the thread hasn't run yet or is in the process of exiting | |
| 283 return THREAD_STATUS_NEW; | |
| 284 } else { | |
| 285 return JVMTI_THREAD_STATE_ALIVE; | |
| 286 } | |
| 287 } | |
| 288 } | |
| 289 | |
| 290 /** returns value of java.lang.Thread.parkBlocker field */ | |
| 291 public static Oop threadOopGetParkBlocker(Oop threadOop) { | |
| 292 initThreadFields(); | |
| 293 if (threadParkBlockerField != null) { | |
| 294 return threadParkBlockerField.getValue(threadOop); | |
| 295 } | |
| 296 return null; | |
| 297 } | |
| 298 | |
| 299 // initialize fields for j.u.c.l AbstractOwnableSynchornizer class | |
| 300 private static void initAbsOwnSyncFields() { | |
| 301 if (absOwnSyncOwnerThreadField == null) { | |
| 302 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 303 InstanceKlass k = sysDict.getAbstractOwnableSynchronizerKlass(); | |
| 304 absOwnSyncOwnerThreadField = | |
| 305 (OopField) k.findField("exclusiveOwnerThread", | |
| 306 "Ljava/lang/Thread;"); | |
| 307 } | |
| 308 } | |
| 309 | |
| 310 // return exclusiveOwnerThread field of AbstractOwnableSynchronizer class | |
| 311 public static Oop abstractOwnableSynchronizerGetOwnerThread(Oop oop) { | |
| 312 initAbsOwnSyncFields(); | |
| 313 if (absOwnSyncOwnerThreadField == null) { | |
| 314 return null; // pre-1.6 VM? | |
| 315 } else { | |
| 316 return absOwnSyncOwnerThreadField.getValue(oop); | |
| 317 } | |
| 318 } | |
| 319 } |