1 /*
   2  * Copyright (c) 2014, 2015, 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 TestWBGC
  26  * @bug 8055098
  27  * @summary Test verify that WB methods isObjectInOldGen and youngGC works correctly.
  28  * @library /testlibrary /test/lib
  29  * @modules java.base/sun.misc
  30  *          java.management
  31  * @build TestWBGC
  32  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  33  * @run driver TestWBGC
  34  */
  35 import jdk.test.lib.*;
  36 import sun.hotspot.WhiteBox;
  37 
  38 public class TestWBGC {
  39 
  40     public static void main(String args[]) throws Exception {
  41         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  42                 true,
  43                 "-Xbootclasspath/a:.",
  44                 "-XX:+UnlockDiagnosticVMOptions",
  45                 "-XX:+WhiteBoxAPI",
  46                 "-XX:MaxTenuringThreshold=1",
  47                 "-XX:+PrintGC",
  48                 GCYoungTest.class.getName());
  49 
  50         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  51         System.out.println(output.getStdout());
  52         output.shouldHaveExitValue(0);
  53         output.shouldContain("WhiteBox Initiated Young GC");
  54         output.shouldNotContain("Full");
  55         // To be sure that we don't provoke Full GC additionaly to young
  56     }
  57 
  58     public static class GCYoungTest {
  59         static WhiteBox wb = WhiteBox.getWhiteBox();
  60         public static Object obj;
  61 
  62         public static void main(String args[]) {
  63             obj = new Object();
  64             Asserts.assertFalse(wb.isObjectInOldGen(obj));
  65             wb.youngGC();
  66             wb.youngGC();
  67             // 2 young GC is needed to promote object into OldGen
  68             Asserts.assertTrue(wb.isObjectInOldGen(obj));
  69         }
  70     }
  71 }
--- EOF ---