1 /*
2  * Copyright (c) 2017, Red Hat, Inc. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
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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 
32 public 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();
static_field()46     static I static_field() { return obj; }
47 
48     // When OSR compiled, this method has an irreducible loop
test(int v, MyException e)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 
main(String[] args)81     static public void main(String[] args) {
82         for (int i = 0; i < 1000; i++) {
83             test(1100, new MyException());
84         }
85     }
86 }
87