1 /*
   2  * Copyright (c) 2017, 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 
  25 import sun.hotspot.WhiteBox;
  26 
  27 public class GCSharedStringsDuringDumpWb {
  28     public static void main(String[] args) throws Exception {
  29         WhiteBox wb = WhiteBox.getWhiteBox();
  30         String s = "shared_test_string_unique_14325";
  31         s = s.intern();
  32         CheckString(wb, s);
  33         for (int i=0; i<100000; i++) {
  34             s = "generated_string " + i;
  35             s = s.intern();
  36             CheckString(wb, s);
  37         }
  38     }
  39 
  40     public static void CheckString(WhiteBox wb, String s) {
  41         if (!wb.areSharedStringsIgnored() && !wb.isShared(s)) {
  42             throw new RuntimeException("String is not shared.");
  43         }
  44     }
  45 }