1 /*
 2  * Copyright (c) 2018, Red Hat, Inc. 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 /**
26  * @test
27  * @summary Test allocation of small object to result OOM, but not to crash JVM
28  * @requires vm.gc.Shenandoah
29  * @library /test/lib
30  * @run driver 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             OutputAnalyzer analyzer = ProcessTools.executeLimitedTestJava(
58                     "-Xmx16m",
59                     "-XX:+UnlockExperimentalVMOptions",
60                     "-XX:+UseShenandoahGC",
61                     TestAllocSmallObj.class.getName(),
62                     "test");
63 
64             analyzer.shouldHaveExitValue(1);
65             analyzer.shouldContain("java.lang.OutOfMemoryError: Java heap space");
66         }
67 
68         {
69             OutputAnalyzer analyzer = ProcessTools.executeLimitedTestJava(
70                     "-Xmx1g",
71                     "-XX:+UnlockExperimentalVMOptions",
72                     "-XX:+UseShenandoahGC",
73                     TestAllocSmallObj.class.getName(),
74                     "test");
75 
76             analyzer.shouldHaveExitValue(0);
77             analyzer.shouldNotContain("java.lang.OutOfMemoryError: Java heap space");
78         }
79     }
80 }