Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/runtime/JNIHandles.java @ 774:f1f3a2719a55
6843580: JavaThread.getStackBase throws sun.jvm.hotspot.WrongTypeException invoked by jstack
Reviewed-by: phh, dice, never, swamyv
author | xlu |
---|---|
date | Fri, 22 May 2009 16:40:38 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.runtime; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.types.*; public class JNIHandles { private static AddressField globalHandlesField; private static AddressField weakGlobalHandlesField; private static OopField deletedHandleField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("JNIHandles"); globalHandlesField = type.getAddressField("_global_handles"); weakGlobalHandlesField = type.getAddressField("_weak_global_handles"); deletedHandleField = type.getOopField("_deleted_handle"); } public JNIHandles() { } public JNIHandleBlock globalHandles() { Address handleAddr = globalHandlesField.getValue(); if (handleAddr == null) { return null; } return new JNIHandleBlock(handleAddr); } public JNIHandleBlock weakGlobalHandles() { Address handleAddr = weakGlobalHandlesField.getValue(); if (handleAddr == null) { return null; } return new JNIHandleBlock(handleAddr); } public OopHandle deletedHandle() { return deletedHandleField.getValue(); } public boolean isDeletedHandle(OopHandle handle) { return (handle != null && handle.equals(deletedHandle())); } }