Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/runtime/JNIHandles.java @ 12704:0e998f0daddf
Code cache: make sure we collect statistics even if the compiler is not recognized
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 07 Nov 2013 11:17:23 +0100 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2000, 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.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())); } }