1 /*
   2  * Copyright (c) 2014, 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 import java.lang.instrument.*;
  24 
  25 public class GetObjectSizeOverflowAgent {
  26 
  27     static Instrumentation instrumentation;
  28 
  29     public static void premain(String agentArgs, Instrumentation instrumentation) {
  30         GetObjectSizeOverflowAgent.instrumentation = instrumentation;
  31     }
  32 
  33     public static void main(String[] args) throws Exception {
  34         long size = 0;
  35         try {
  36             int[] a = new int[600_000_000];
  37             size = instrumentation.getObjectSize(a);
  38         }
  39         catch(OutOfMemoryError e) {
  40             System.out.println("OOM allocating test int[] of 600000000 elements, skipping.");
  41             return;
  42         }
  43         if(size < 2_400_000_000L) {
  44             throw new RuntimeException("Invalid size of array, expected >= 2400000000, got " + size);
  45         }
  46     }
  47 }