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  * @library /test/lib
  28  * @run main TestAllocSmallObj
  29  */
  30 
  31 import jdk.test.lib.process.OutputAnalyzer;
  32 import jdk.test.lib.process.ProcessTools;
  33 
  34 public class TestAllocSmallObj {
  35 
  36     static final int COUNT = 16*1024*1024;
  37 
  38     static volatile Object sink;
  39 
  40     public static void work() throws Exception {
  41         Object[] root = new Object[COUNT];
  42         sink = root;
  43         for (int c = 0; c < COUNT; c++) {
  44             root[c] = new Object();
  45         }
  46     }
  47 
  48     public static void main(String[] args) throws Exception {
  49         if (args.length > 0) {
  50             work();
  51             return;
  52         }
  53 
  54         {
  55             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  56                                     "-Xmx16m",
  57                                     "-XX:+UnlockExperimentalVMOptions",
  58                                     "-XX:+UseShenandoahGC",
  59                                     TestAllocSmallObj.class.getName(),
  60                                     "test");
  61 
  62             OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  63             analyzer.shouldHaveExitValue(1);
  64             analyzer.shouldContain("java.lang.OutOfMemoryError: Java heap space");
  65         }
  66 
  67         {
  68             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
  69                                     "-Xmx1g",
  70                                     "-XX:+UnlockExperimentalVMOptions",
  71                                     "-XX:+UseShenandoahGC",
  72                                     TestAllocSmallObj.class.getName(),
  73                                     "test");
  74 
  75             OutputAnalyzer analyzer = new OutputAnalyzer(pb.start());
  76             analyzer.shouldHaveExitValue(0);
  77             analyzer.shouldNotContain("java.lang.OutOfMemoryError: Java heap space");
  78         }
  79     }
  80 }