1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /**
  25  * @test TestAllocSmallObj
  26  * @summary Test allocation of small object to result OOM, but not to crash JVM
  27  * @key gc
  28  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  29  * @library /test/lib
  30  * @run main TestAllocSmallObj
  31  */
  32 
  33 import jdk.test.lib.process.OutputAnalyzer;
  34 import jdk.test.lib.process.ProcessTools;
  35 
  36 public class TestAllocSmallObj {
  37 
  38     static final int COUNT = 16 * 1024 * 1024;
  39 
  40     static volatile Object sink;
  41 
  42     public static void work() throws Exception {
  43         Object[] root = new Object[COUNT];
  44         sink = root;
  45         for (int c = 0; c < COUNT; c++) {
  46             root[c] = new Object();
  47         }
  48     }
  49 
  50     public static void main(String[] args) throws Exception {
  51         if (args.length > 0) {
  52             work();
  53             return;
  54         }
  55 
  56         {
  57             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  58                     "-Xmx16m",
  59                     "-XX:+UnlockExperimentalVMOptions",
  60                     "-XX:+UseShenandoahGC",
  61                     TestAllocSmallObj.class.getName(),
  62                     "test");
  63 
  64             OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  65             analyzer.shouldHaveExitValue(1);
  66             analyzer.shouldContain("java.lang.OutOfMemoryError: Java heap space");
  67         }
  68 
  69         {
  70             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  71                     "-Xmx1g",
  72                     "-XX:+UnlockExperimentalVMOptions",
  73                     "-XX:+UseShenandoahGC",
  74                     TestAllocSmallObj.class.getName(),
  75                     "test");
  76 
  77             OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  78             analyzer.shouldHaveExitValue(0);
  79             analyzer.shouldNotContain("java.lang.OutOfMemoryError: Java heap space");
  80         }
  81     }
  82 }