GetObjectSizeOverflowAgent.java

/*
 * Copyright (c) 2014, 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
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import java.lang.instrument.*;

public class GetObjectSizeOverflowAgent {

    static Instrumentation instrumentation;

    public static void premain(String agentArgs, Instrumentation instrumentation) {
        GetObjectSizeOverflowAgent.instrumentation = instrumentation;
    }

    public static void main(String[] args) throws Exception {
        int[] a = new int[600_000_000];
        long size = instrumentation.getObjectSize(a);

        if (size < 2_400_000_000L) {
            throw new RuntimeException("Invalid size of array, expected >= 2400000000, got " + size);
        }

        System.out.println("GetObjectSizeOverflow passed");
    }
}