/*

 * 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.

 */

import java.lang.instrument.*;

public class GetObjectSizeClassAgent {

    static Instrumentation instrumentation;

    public static void premain(String agentArgs, Instrumentation instrumentation) {

        GetObjectSizeClassAgent.instrumentation = instrumentation;

    }

    public static void main(String[] args) throws Exception {

        long sizeA = instrumentation.getObjectSize(A.class);

        long sizeB = instrumentation.getObjectSize(B.class);

        if (sizeA != sizeB) {

            throw new RuntimeException("java.lang.Class sizes disagree: " + sizeA + " vs. " + sizeB);

        }

        System.out.println("GetObjectSizeClass passed");

    }

    static class A {

    }

    static class B {

        void m() {}

    }

}