Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/oops/java_lang_Class.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 | 8e47bac5643a |
children |
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/* * Copyright (c) 2011, 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.AddressField; import sun.jvm.hotspot.types.Type; import sun.jvm.hotspot.types.TypeDataBase; import sun.jvm.hotspot.utilities.*; import sun.jvm.hotspot.jdi.JVMTIThreadState; /** A utility class encapsulating useful oop operations */ // initialize fields for java.lang.Class public class java_lang_Class { // java.lang.Class fields static int klassOffset; static IntField oopSizeField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { // klass and oop_size are HotSpot magic fields and hence we can't // find them from InstanceKlass for java.lang.Class. Type jlc = db.lookupType("java_lang_Class"); klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue(); int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue(); oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true); } /** get Klass* field at offset hc_klass_offset from a java.lang.Class object */ public static Klass asKlass(Oop aClass) { return (Klass)Metadata.instantiateWrapperFor(aClass.getHandle().getAddressAt(klassOffset)); } /** get oop_size field at offset oop_size_offset from a java.lang.Class object */ public static long getOopSize(Oop aClass) { return java_lang_Class.oopSizeField.getValue(aClass); } }