1/*
2 * Copyright (c) 2017, 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 * @test
26 * @bug 8173147
27 * @summary Loads generated at uncommon trap from eliminated arraycopy have incorrect memory state
28 * @run main/othervm -XX:CompileOnly=TestArrayCopyUNCBadMem::test -Xcomp TestArrayCopyUNCBadMem
29 *
30 */
31
32
33public class TestArrayCopyUNCBadMem {
34
35    volatile static int field;
36
37    static class unloaded {
38        static int dummy;
39    }
40
41    static int test(int[] input) {
42        int[] alloc = new int[10];
43        System.arraycopy(input, 0, alloc, 0, 10);
44
45        // membars to have anti-dependence edges and make scheduling
46        // fail
47        field = 0x42;
48
49        // uncommon trap
50        unloaded.dummy = 0x42;
51
52        return alloc[0] + alloc[1];
53    }
54
55    public static void main(String[] args) {
56        int[] array = new int[10];
57        System.arraycopy(array, 0, array, 0, 0); // load System class
58        test(array);
59    }
60}
61