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 8174164
27 * @summary SafePointNode::_replaced_nodes breaks with irreducible loops
28 * @run main/othervm -XX:-BackgroundCompilation TestReplacedNodesOSR
29 *
30 */
31
32public class TestReplacedNodesOSR {
33
34    static Object dummy;
35
36    static interface I {
37    }
38
39    static class A implements I {
40    }
41
42    static final class MyException extends Exception {
43    }
44
45    static final A obj = new A();
46    static I static_field() { return obj; }
47
48    // When OSR compiled, this method has an irreducible loop
49    static void test(int v, MyException e) {
50        int i = 0;
51        for (;;) {
52            if (i == 1000) {
53                break;
54            }
55            try {
56                if ((i%2) == 0) {
57                    int j = 0;
58                    for (;;) {
59                        j++;
60                        if (i+j != v) {
61                            if (j == 1000) {
62                                break;
63                            }
64                        } else {
65                            A a = (A)static_field();
66                            // replaced node recorded here
67                            throw e;
68                        }
69                    }
70                }
71            } catch(MyException ex) {
72            }
73            i++;
74            // replaced node applied on return of the method
75            // replaced node used here
76            dummy = static_field();
77        }
78    }
79
80
81    static public void main(String[] args) {
82        for (int i = 0; i < 1000; i++) {
83            test(1100, new MyException());
84        }
85    }
86}
87