Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/oops/OopUtilities.java @ 6972:bd7a7ce2e264
6830717: replay of compilations would help with debugging
Summary: When java process crashed in compiler thread, repeat the compilation process will help finding root cause. This is done with using SA dump application class data and replay data from core dump, then use debug version of jvm to recompile the problematic java method.
Reviewed-by: kvn, twisti, sspitsyn
Contributed-by: yumin.qi@oracle.com
author | minqi |
---|---|
date | Mon, 12 Nov 2012 14:03:53 -0800 |
parents | cfa2c82f4c04 |
children | f9d003ea9023 |
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/* * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.oops; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.memory.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.TypeDataBase; import sun.jvm.hotspot.utilities.*; import sun.jvm.hotspot.jdi.JVMTIThreadState; /** A utility class encapsulating useful oop operations */ public class OopUtilities implements /* imports */ JVMTIThreadState { // FIXME: access should be synchronized and cleared when VM is // resumed // String fields private static IntField offsetField; private static IntField countField; private static OopField valueField; // ThreadGroup fields private static OopField threadGroupParentField; private static OopField threadGroupNameField; private static IntField threadGroupNThreadsField; private static OopField threadGroupThreadsField; private static IntField threadGroupNGroupsField; private static OopField threadGroupGroupsField; // Thread fields private static OopField threadNameField; private static OopField threadGroupField; private static LongField threadEETopField; // threadStatus field is new since 1.5 private static IntField threadStatusField; // parkBlocker field is new since 1.6 private static OopField threadParkBlockerField; // possible values of java_lang_Thread::ThreadStatus private static int THREAD_STATUS_NEW; /* Other enum constants are not needed as of now. Uncomment these as and when needed. private static int THREAD_STATUS_RUNNABLE; private static int THREAD_STATUS_SLEEPING; private static int THREAD_STATUS_IN_OBJECT_WAIT; private static int THREAD_STATUS_IN_OBJECT_WAIT_TIMED; private static int THREAD_STATUS_PARKED; private static int THREAD_STATUS_PARKED_TIMED; private static int THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER; private static int THREAD_STATUS_TERMINATED; */ // java.util.concurrent.locks.AbstractOwnableSynchronizer fields private static OopField absOwnSyncOwnerThreadField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { // FIXME: don't need this observer; however, do need a VM resumed // and suspended observer to refetch fields } public static String charArrayToString(TypeArray charArray) { if (charArray == null) { return null; } return charArrayToString(charArray, 0, (int) charArray.getLength()); } public static String charArrayToString(TypeArray charArray, int offset, int length) { if (charArray == null) { return null; } final int limit = offset + length; if (Assert.ASSERTS_ENABLED) { Assert.that(offset >= 0 && limit <= charArray.getLength(), "out of bounds"); } StringBuffer buf = new StringBuffer(length); for (int i = offset; i < limit; i++) { buf.append(charArray.getCharAt(i)); } return buf.toString(); } public static String escapeString(String s) { StringBuilder sb = null; for (int index = 0; index < s.length(); index++) { char value = s.charAt(index); if (value >= 32 && value < 127 || value == '\'' || value == '\\') { if (sb != null) { sb.append(value); } } else { if (sb == null) { sb = new StringBuilder(s.length() * 2); sb.append(s, 0, index); } sb.append("\\u"); if (value < 0x10) sb.append("000"); else if (value < 0x100) sb.append("00"); else if (value < 0x1000) sb.append("0"); sb.append(Integer.toHexString(value)); } } if (sb != null) { return sb.toString(); } return s; } public static String stringOopToString(Oop stringOop) { if (offsetField == null) { InstanceKlass k = (InstanceKlass) stringOop.getKlass(); offsetField = (IntField) k.findField("offset", "I"); // optional countField = (IntField) k.findField("count", "I"); // optional valueField = (OopField) k.findField("value", "[C"); if (Assert.ASSERTS_ENABLED) { Assert.that(valueField != null, "Field \'value\' of java.lang.String not found"); } } if (offsetField != null && countField != null) { return charArrayToString((TypeArray) valueField.getValue(stringOop), offsetField.getValue(stringOop), countField.getValue(stringOop)); } return charArrayToString((TypeArray) valueField.getValue(stringOop)); } public static String stringOopToEscapedString(Oop stringOop) { return escapeString(stringOopToString(stringOop)); } private static void initThreadGroupFields() { if (threadGroupParentField == null) { SystemDictionary sysDict = VM.getVM().getSystemDictionary(); InstanceKlass k = sysDict.getThreadGroupKlass(); threadGroupParentField = (OopField) k.findField("parent", "Ljava/lang/ThreadGroup;"); threadGroupNameField = (OopField) k.findField("name", "Ljava/lang/String;"); threadGroupNThreadsField = (IntField) k.findField("nthreads", "I"); threadGroupThreadsField = (OopField) k.findField("threads", "[Ljava/lang/Thread;"); threadGroupNGroupsField = (IntField) k.findField("ngroups", "I"); threadGroupGroupsField = (OopField) k.findField("groups", "[Ljava/lang/ThreadGroup;"); if (Assert.ASSERTS_ENABLED) { Assert.that(threadGroupParentField != null && threadGroupNameField != null && threadGroupNThreadsField != null && threadGroupThreadsField != null && threadGroupNGroupsField != null && threadGroupGroupsField != null, "must find all java.lang.ThreadGroup fields"); } } } public static Oop threadGroupOopGetParent(Oop threadGroupOop) { initThreadGroupFields(); return threadGroupParentField.getValue(threadGroupOop); } public static String threadGroupOopGetName(Oop threadGroupOop) { initThreadGroupFields(); return stringOopToString(threadGroupNameField.getValue(threadGroupOop)); } public static Oop[] threadGroupOopGetThreads(Oop threadGroupOop) { initThreadGroupFields(); int nthreads = threadGroupNThreadsField.getValue(threadGroupOop); Oop[] result = new Oop[nthreads]; ObjArray threads = (ObjArray) threadGroupThreadsField.getValue(threadGroupOop); for (int i = 0; i < nthreads; i++) { result[i] = threads.getObjAt(i); } return result; } public static Oop[] threadGroupOopGetGroups(Oop threadGroupOop) { initThreadGroupFields(); int ngroups = threadGroupNGroupsField.getValue(threadGroupOop); Oop[] result = new Oop[ngroups]; ObjArray groups = (ObjArray) threadGroupGroupsField.getValue(threadGroupOop); for (int i = 0; i < ngroups; i++) { result[i] = groups.getObjAt(i); } return result; } private static void initThreadFields() { if (threadNameField == null) { SystemDictionary sysDict = VM.getVM().getSystemDictionary(); InstanceKlass k = sysDict.getThreadKlass(); threadNameField = (OopField) k.findField("name", "[C"); threadGroupField = (OopField) k.findField("group", "Ljava/lang/ThreadGroup;"); threadEETopField = (LongField) k.findField("eetop", "J"); threadStatusField = (IntField) k.findField("threadStatus", "I"); threadParkBlockerField = (OopField) k.findField("parkBlocker", "Ljava/lang/Object;"); TypeDataBase db = VM.getVM().getTypeDataBase(); THREAD_STATUS_NEW = db.lookupIntConstant("java_lang_Thread::NEW").intValue(); /* Other enum constants are not needed as of now. Uncomment these as and when needed. THREAD_STATUS_RUNNABLE = db.lookupIntConstant("java_lang_Thread::RUNNABLE").intValue(); THREAD_STATUS_SLEEPING = db.lookupIntConstant("java_lang_Thread::SLEEPING").intValue(); THREAD_STATUS_IN_OBJECT_WAIT = db.lookupIntConstant("java_lang_Thread::IN_OBJECT_WAIT").intValue(); THREAD_STATUS_IN_OBJECT_WAIT_TIMED = db.lookupIntConstant("java_lang_Thread::IN_OBJECT_WAIT_TIMED").intValue(); THREAD_STATUS_PARKED = db.lookupIntConstant("java_lang_Thread::PARKED").intValue(); THREAD_STATUS_PARKED_TIMED = db.lookupIntConstant("java_lang_Thread::PARKED_TIMED").intValue(); THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER = db.lookupIntConstant("java_lang_Thread::BLOCKED_ON_MONITOR_ENTER").intValue(); THREAD_STATUS_TERMINATED = db.lookupIntConstant("java_lang_Thread::TERMINATED").intValue(); */ if (Assert.ASSERTS_ENABLED) { // it is okay to miss threadStatusField, because this was // introduced only in 1.5 JDK. Assert.that(threadNameField != null && threadGroupField != null && threadEETopField != null, "must find all java.lang.Thread fields"); } } } public static Oop threadOopGetThreadGroup(Oop threadOop) { initThreadFields(); return threadGroupField.getValue(threadOop); } public static String threadOopGetName(Oop threadOop) { initThreadFields(); return charArrayToString((TypeArray) threadNameField.getValue(threadOop)); } /** May return null if, e.g., thread was not started */ public static JavaThread threadOopGetJavaThread(Oop threadOop) { initThreadFields(); Address addr = threadOop.getHandle().getAddressAt(threadEETopField.getOffset()); if (addr == null) { return null; } return VM.getVM().getThreads().createJavaThreadWrapper(addr); } /** returns value of java.lang.Thread.threadStatus field */ public static int threadOopGetThreadStatus(Oop threadOop) { initThreadFields(); // The threadStatus is only present starting in 1.5 if (threadStatusField != null) { return (int) threadStatusField.getValue(threadOop); } else { // All we can easily figure out is if it is alive, but that is // enough info for a valid unknown status. JavaThread thr = threadOopGetJavaThread(threadOop); if (thr == null) { // the thread hasn't run yet or is in the process of exiting return THREAD_STATUS_NEW; } else { return JVMTI_THREAD_STATE_ALIVE; } } } /** returns value of java.lang.Thread.parkBlocker field */ public static Oop threadOopGetParkBlocker(Oop threadOop) { initThreadFields(); if (threadParkBlockerField != null) { return threadParkBlockerField.getValue(threadOop); } return null; } // initialize fields for j.u.c.l AbstractOwnableSynchornizer class private static void initAbsOwnSyncFields() { if (absOwnSyncOwnerThreadField == null) { SystemDictionary sysDict = VM.getVM().getSystemDictionary(); InstanceKlass k = sysDict.getAbstractOwnableSynchronizerKlass(); absOwnSyncOwnerThreadField = (OopField) k.findField("exclusiveOwnerThread", "Ljava/lang/Thread;"); } } // return exclusiveOwnerThread field of AbstractOwnableSynchronizer class public static Oop abstractOwnableSynchronizerGetOwnerThread(Oop oop) { initAbsOwnSyncFields(); if (absOwnSyncOwnerThreadField == null) { return null; // pre-1.6 VM? } else { return absOwnSyncOwnerThreadField.getValue(oop); } } }