1 /*
   2  * Copyright (c) 2011, 2018, 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  * @test
  26  * @key stress gc
  27  *
  28  * @summary converted from VM Testbase gc/hashcode/HashCodeSimpleTest.
  29  * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent, jrockit]
  30  * VM Testbase readme:
  31  * DESCRIPTION
  32  * Hash code regressiontests.
  33  *
  34  * COMMENTS
  35  * This test was ported from JRockit test suite.
  36  *
  37  * @library /vmTestbase
  38  *          /test/lib
  39  * @run driver jdk.test.lib.FileInstaller . .
  40  * @run main/othervm -XX:-UseGCOverheadLimit gc.hashcode.HashCodeSimpleTest.HashCodeSimpleTest
  41  */
  42 
  43 package gc.hashcode.HashCodeSimpleTest;
  44 
  45 import nsk.share.TestFailure;
  46 import nsk.share.gc.GC;
  47 import nsk.share.gc.ThreadedGCTest;
  48 
  49 /**
  50  * Hash code regressiontests.
  51  */
  52 public class HashCodeSimpleTest extends ThreadedGCTest {
  53 
  54     @Override
  55     protected Runnable createRunnable(int i) {
  56 
  57 
  58 
  59         /**
  60          * Test verifies that VM provided hashcodes are constant over invocations.
  61          * @return success if the test passes
  62          *          failure if some hashvalue has changed
  63          */
  64         return new Runnable() {
  65             long counter = 0;
  66 
  67 
  68             @Override
  69             public void run() {
  70 
  71                 Object object = new Object();
  72                 int hashCode0 = object.hashCode();
  73 
  74                 for (int i = 0; i < 100; i++) {
  75                     int hashCode = object.hashCode();
  76 
  77                     if (hashCode != hashCode0) {
  78                         throw new TestFailure("Repeated hash code queries broken: "
  79                                 + hashCode0 + "!=" + hashCode);
  80                     }
  81                 }
  82                 if (counter++ % 1000000 == 0) {
  83                     log.info(counter / 1000000 + " million hashcodes verified");
  84                 }
  85 
  86 
  87             }
  88         };
  89     }
  90 
  91     public static void main(String args[]) {
  92         GC.runTest(new HashCodeSimpleTest(), args);
  93     }
  94 }