1 /*
2  * Copyright (c) 2019, 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 8231620
27  * @summary assert(bol->is_Bool()) crash during split if due to FastLockNode
28  *
29  * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation -XX:-UseOnStackReplacement SplitIfSharedFastLockBehindCastPP
30  */
31 
32 
33 public class SplitIfSharedFastLockBehindCastPP {
34     private static boolean field;
35     private static A obj_field;
36 
main(String[] args)37     public static void main(String[] args) {
38         A lock = new A();
39         obj_field = lock;
40         for (int i = 0; i < 20_000; i++) {
41             test1(true, lock);
42             test1(false, lock);
43             test2(true);
44             test2(false);
45         }
46     }
47 
test1(boolean flag, Object obj)48     private static void test1(boolean flag, Object obj) {
49         if (obj == null) {
50         }
51 
52         boolean flag2;
53         if (flag) {
54             flag2 = true;
55         } else {
56             flag2 = false;
57             obj = obj_field;
58         }
59 
60         // This loop will be unswitched. The condition becomes candidate for split if
61         for (int i = 0; i < 100; i++) {
62             if (flag2) {
63                 field = true;
64             } else {
65                 field = false;
66             }
67             synchronized (obj) {
68                 field = true;
69             }
70         }
71     }
72 
test2(boolean flag)73     private static Object test2(boolean flag) {
74         int integer;
75         if (flag) {
76             field = true;
77             integer = 1;
78         } else {
79             field = false;
80             integer = 2;
81         }
82 
83         Object obj = integer;
84 
85         // This loop will be unswitched. The condition becomes candidate for split if
86         for (int i = 0; i < 100; i++) {
87             if (integer == 1) {
88                 field = true;
89             } else {
90                 field = false;
91             }
92             synchronized (obj) {
93                 field = true;
94             }
95         }
96         return obj;
97     }
98 
99     private static final class A {
100     }
101 }
102