1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package org.graalvm.compiler.hotspot;
  25 
  26 import java.lang.reflect.Method;
  27 
  28 import jdk.vm.ci.hotspot.HotSpotResolvedObjectType;
  29 
  30 /**
  31  * Reflective wrapper around the fingerprint generation functionality in JDK9.
  32  */
  33 public class FingerprintUtil {
  34     private static Method getFingerprint;
  35     static {
  36         try {
  37             getFingerprint = HotSpotResolvedObjectType.class.getMethod("getFingerprint");
  38         } catch (Exception e) {
  39         }
  40     }
  41 
  42     public static long getFingerprint(HotSpotResolvedObjectType type) {
  43         if (getFingerprint != null) {
  44             try {
  45                 return ((Long) getFingerprint.invoke(type)).longValue();
  46             } catch (Exception e) {
  47             }
  48         }
  49         return 0;
  50     }
  51 }