--- /dev/null 2016-05-31 09:42:47.975716356 -0700 +++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/FingerprintUtil.java 2016-12-09 00:49:15.030683356 -0800 @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2016, 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 org.graalvm.compiler.hotspot; + +import java.lang.reflect.Method; + +import jdk.vm.ci.hotspot.HotSpotResolvedObjectType; + +/** + * Reflective wrapper around the fingerprint generation functionality in JDK9. + */ +public class FingerprintUtil { + private static Method getFingerprint; + static { + try { + getFingerprint = HotSpotResolvedObjectType.class.getMethod("getFingerprint"); + } catch (Exception e) { + } + } + + public static long getFingerprint(HotSpotResolvedObjectType type) { + if (getFingerprint != null) { + try { + return ((Long) getFingerprint.invoke(type)).longValue(); + } catch (Exception e) { + } + } + return 0; + } +}