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annotate agent/src/share/classes/sun/jvm/hotspot/oops/OopUtilities.java @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | d1605aabd0a1 |
| children | c7f3d0b4570f |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, 2008, 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.lang.Class fields | |
| 78 private static OopField hcKlassField; | |
| 79 | |
| 80 // java.util.concurrent.locks.AbstractOwnableSynchronizer fields | |
| 81 private static OopField absOwnSyncOwnerThreadField; | |
| 82 | |
| 83 static { | |
| 84 VM.registerVMInitializedObserver(new Observer() { | |
| 85 public void update(Observable o, Object data) { | |
| 86 initialize(VM.getVM().getTypeDataBase()); | |
| 87 } | |
| 88 }); | |
| 89 } | |
| 90 | |
| 91 private static synchronized void initialize(TypeDataBase db) { | |
| 92 // FIXME: don't need this observer; however, do need a VM resumed | |
| 93 // and suspended observer to refetch fields | |
| 94 } | |
| 95 | |
| 96 public static String charArrayToString(TypeArray charArray) { | |
| 97 if (charArray == null) { | |
| 98 return null; | |
| 99 } | |
| 100 return charArrayToString(charArray, 0, (int) charArray.getLength()); | |
| 101 } | |
| 102 | |
| 103 public static String charArrayToString(TypeArray charArray, int offset, int length) { | |
| 104 if (charArray == null) { | |
| 105 return null; | |
| 106 } | |
| 107 final int limit = offset + length; | |
| 108 if (Assert.ASSERTS_ENABLED) { | |
| 109 Assert.that(offset >= 0 && limit <= charArray.getLength(), "out of bounds"); | |
| 110 } | |
| 111 StringBuffer buf = new StringBuffer(length); | |
| 112 for (int i = offset; i < limit; i++) { | |
| 113 buf.append(charArray.getCharAt(i)); | |
| 114 } | |
| 115 return buf.toString(); | |
| 116 } | |
| 117 | |
| 118 public static String stringOopToString(Oop stringOop) { | |
| 119 if (offsetField == null) { | |
| 120 InstanceKlass k = (InstanceKlass) stringOop.getKlass(); | |
| 121 offsetField = (IntField) k.findField("offset", "I"); | |
| 122 countField = (IntField) k.findField("count", "I"); | |
| 123 valueField = (OopField) k.findField("value", "[C"); | |
| 124 if (Assert.ASSERTS_ENABLED) { | |
| 125 Assert.that(offsetField != null && | |
| 126 countField != null && | |
| 127 valueField != null, "must find all java.lang.String fields"); | |
| 128 } | |
| 129 } | |
| 130 return charArrayToString((TypeArray) valueField.getValue(stringOop), | |
| 131 offsetField.getValue(stringOop), | |
| 132 countField.getValue(stringOop)); | |
| 133 } | |
| 134 | |
| 135 private static void initThreadGroupFields() { | |
| 136 if (threadGroupParentField == null) { | |
| 137 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 138 InstanceKlass k = sysDict.getThreadGroupKlass(); | |
| 139 threadGroupParentField = (OopField) k.findField("parent", "Ljava/lang/ThreadGroup;"); | |
| 140 threadGroupNameField = (OopField) k.findField("name", "Ljava/lang/String;"); | |
| 141 threadGroupNThreadsField = (IntField) k.findField("nthreads", "I"); | |
| 142 threadGroupThreadsField = (OopField) k.findField("threads", "[Ljava/lang/Thread;"); | |
| 143 threadGroupNGroupsField = (IntField) k.findField("ngroups", "I"); | |
| 144 threadGroupGroupsField = (OopField) k.findField("groups", "[Ljava/lang/ThreadGroup;"); | |
| 145 if (Assert.ASSERTS_ENABLED) { | |
| 146 Assert.that(threadGroupParentField != null && | |
| 147 threadGroupNameField != null && | |
| 148 threadGroupNThreadsField != null && | |
| 149 threadGroupThreadsField != null && | |
| 150 threadGroupNGroupsField != null && | |
| 151 threadGroupGroupsField != null, "must find all java.lang.ThreadGroup fields"); | |
| 152 } | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 public static Oop threadGroupOopGetParent(Oop threadGroupOop) { | |
| 157 initThreadGroupFields(); | |
| 158 return threadGroupParentField.getValue(threadGroupOop); | |
| 159 } | |
| 160 | |
| 161 public static String threadGroupOopGetName(Oop threadGroupOop) { | |
| 162 initThreadGroupFields(); | |
| 163 return stringOopToString(threadGroupNameField.getValue(threadGroupOop)); | |
| 164 } | |
| 165 | |
| 166 public static Oop[] threadGroupOopGetThreads(Oop threadGroupOop) { | |
| 167 initThreadGroupFields(); | |
| 168 int nthreads = threadGroupNThreadsField.getValue(threadGroupOop); | |
| 169 Oop[] result = new Oop[nthreads]; | |
| 170 ObjArray threads = (ObjArray) threadGroupThreadsField.getValue(threadGroupOop); | |
| 171 for (int i = 0; i < nthreads; i++) { | |
| 172 result[i] = threads.getObjAt(i); | |
| 173 } | |
| 174 return result; | |
| 175 } | |
| 176 | |
| 177 public static Oop[] threadGroupOopGetGroups(Oop threadGroupOop) { | |
| 178 initThreadGroupFields(); | |
| 179 int ngroups = threadGroupNGroupsField.getValue(threadGroupOop); | |
| 180 Oop[] result = new Oop[ngroups]; | |
| 181 ObjArray groups = (ObjArray) threadGroupGroupsField.getValue(threadGroupOop); | |
| 182 for (int i = 0; i < ngroups; i++) { | |
| 183 result[i] = groups.getObjAt(i); | |
| 184 } | |
| 185 return result; | |
| 186 } | |
| 187 | |
| 188 private static void initThreadFields() { | |
| 189 if (threadNameField == null) { | |
| 190 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 191 InstanceKlass k = sysDict.getThreadKlass(); | |
| 192 threadNameField = (OopField) k.findField("name", "[C"); | |
| 193 threadGroupField = (OopField) k.findField("group", "Ljava/lang/ThreadGroup;"); | |
| 194 threadEETopField = (LongField) k.findField("eetop", "J"); | |
| 195 threadStatusField = (IntField) k.findField("threadStatus", "I"); | |
| 196 threadParkBlockerField = (OopField) k.findField("parkBlocker", | |
| 197 "Ljava/lang/Object;"); | |
| 198 TypeDataBase db = VM.getVM().getTypeDataBase(); | |
| 199 THREAD_STATUS_NEW = db.lookupIntConstant("java_lang_Thread::NEW").intValue(); | |
| 200 /* | |
| 201 Other enum constants are not needed as of now. Uncomment these as and when needed. | |
| 202 | |
| 203 THREAD_STATUS_RUNNABLE = db.lookupIntConstant("java_lang_Thread::RUNNABLE").intValue(); | |
| 204 THREAD_STATUS_SLEEPING = db.lookupIntConstant("java_lang_Thread::SLEEPING").intValue(); | |
| 205 THREAD_STATUS_IN_OBJECT_WAIT = db.lookupIntConstant("java_lang_Thread::IN_OBJECT_WAIT").intValue(); | |
| 206 THREAD_STATUS_IN_OBJECT_WAIT_TIMED = db.lookupIntConstant("java_lang_Thread::IN_OBJECT_WAIT_TIMED").intValue(); | |
| 207 THREAD_STATUS_PARKED = db.lookupIntConstant("java_lang_Thread::PARKED").intValue(); | |
| 208 THREAD_STATUS_PARKED_TIMED = db.lookupIntConstant("java_lang_Thread::PARKED_TIMED").intValue(); | |
| 209 THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER = db.lookupIntConstant("java_lang_Thread::BLOCKED_ON_MONITOR_ENTER").intValue(); | |
| 210 THREAD_STATUS_TERMINATED = db.lookupIntConstant("java_lang_Thread::TERMINATED").intValue(); | |
| 211 */ | |
| 212 | |
| 213 if (Assert.ASSERTS_ENABLED) { | |
| 214 // it is okay to miss threadStatusField, because this was | |
| 215 // introduced only in 1.5 JDK. | |
| 216 Assert.that(threadNameField != null && | |
| 217 threadGroupField != null && | |
| 218 threadEETopField != null, "must find all java.lang.Thread fields"); | |
| 219 } | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 public static Oop threadOopGetThreadGroup(Oop threadOop) { | |
| 224 initThreadFields(); | |
| 225 return threadGroupField.getValue(threadOop); | |
| 226 } | |
| 227 | |
| 228 public static String threadOopGetName(Oop threadOop) { | |
| 229 initThreadFields(); | |
| 230 return charArrayToString((TypeArray) threadNameField.getValue(threadOop)); | |
| 231 } | |
| 232 | |
| 233 /** May return null if, e.g., thread was not started */ | |
| 234 public static JavaThread threadOopGetJavaThread(Oop threadOop) { | |
| 235 initThreadFields(); | |
| 236 Address addr = threadOop.getHandle().getAddressAt(threadEETopField.getOffset()); | |
| 237 if (addr == null) { | |
| 238 return null; | |
| 239 } | |
| 240 return VM.getVM().getThreads().createJavaThreadWrapper(addr); | |
| 241 } | |
| 242 | |
| 243 /** returns value of java.lang.Thread.threadStatus field */ | |
| 244 public static int threadOopGetThreadStatus(Oop threadOop) { | |
| 245 initThreadFields(); | |
| 246 // The threadStatus is only present starting in 1.5 | |
| 247 if (threadStatusField != null) { | |
| 248 return (int) threadStatusField.getValue(threadOop); | |
| 249 } else { | |
| 250 // All we can easily figure out is if it is alive, but that is | |
| 251 // enough info for a valid unknown status. | |
| 252 JavaThread thr = threadOopGetJavaThread(threadOop); | |
| 253 if (thr == null) { | |
| 254 // the thread hasn't run yet or is in the process of exiting | |
| 255 return THREAD_STATUS_NEW; | |
| 256 } else { | |
| 257 return JVMTI_THREAD_STATE_ALIVE; | |
| 258 } | |
| 259 } | |
| 260 } | |
| 261 | |
| 262 /** returns value of java.lang.Thread.parkBlocker field */ | |
| 263 public static Oop threadOopGetParkBlocker(Oop threadOop) { | |
| 264 initThreadFields(); | |
| 265 if (threadParkBlockerField != null) { | |
| 266 return threadParkBlockerField.getValue(threadOop); | |
| 267 } | |
| 268 return null; | |
| 269 } | |
| 270 | |
| 271 // initialize fields for java.lang.Class | |
| 272 private static void initClassFields() { | |
| 273 if (hcKlassField == null) { | |
| 274 // hc_klass is a HotSpot magic field and hence we can't | |
| 275 // find it from InstanceKlass for java.lang.Class. | |
| 276 TypeDataBase db = VM.getVM().getTypeDataBase(); | |
| 180 | 277 int hcKlassOffset = (int) Instance.getHeaderSize(); |
| 0 | 278 try { |
| 279 hcKlassOffset += (db.lookupIntConstant("java_lang_Class::hc_klass_offset").intValue() * | |
| 180 | 280 VM.getVM().getHeapOopSize()); |
| 0 | 281 } catch (RuntimeException re) { |
| 282 // ignore, currently java_lang_Class::hc_klass_offset is zero | |
| 283 } | |
|
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284 if (VM.getVM().isCompressedOopsEnabled()) { |
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285 hcKlassField = new NarrowOopField(new NamedFieldIdentifier("hc_klass"), hcKlassOffset, true); |
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286 } else { |
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287 hcKlassField = new OopField(new NamedFieldIdentifier("hc_klass"), hcKlassOffset, true); |
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288 } |
| 0 | 289 } |
| 290 } | |
| 291 | |
| 292 /** get klassOop field at offset hc_klass_offset from a java.lang.Class object */ | |
| 293 public static Klass classOopToKlass(Oop aClass) { | |
| 294 initClassFields(); | |
| 295 return (Klass) hcKlassField.getValue(aClass); | |
| 296 } | |
| 297 | |
| 298 // initialize fields for j.u.c.l AbstractOwnableSynchornizer class | |
| 299 private static void initAbsOwnSyncFields() { | |
| 300 if (absOwnSyncOwnerThreadField == null) { | |
| 301 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 302 InstanceKlass k = sysDict.getAbstractOwnableSynchronizerKlass(); | |
| 303 absOwnSyncOwnerThreadField = | |
| 304 (OopField) k.findField("exclusiveOwnerThread", | |
| 305 "Ljava/lang/Thread;"); | |
| 306 } | |
| 307 } | |
| 308 | |
| 309 // return exclusiveOwnerThread field of AbstractOwnableSynchronizer class | |
| 310 public static Oop abstractOwnableSynchronizerGetOwnerThread(Oop oop) { | |
| 311 initAbsOwnSyncFields(); | |
| 312 if (absOwnSyncOwnerThreadField == null) { | |
| 313 return null; // pre-1.6 VM? | |
| 314 } else { | |
| 315 return absOwnSyncOwnerThreadField.getValue(oop); | |
| 316 } | |
| 317 } | |
| 318 } |