hotspot/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/FingerprintUtil.java

/*
 * 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;
    }
}