1 /*
 2  * Copyright (c) 2025, Oracle and/or its affiliates. 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 package compiler.valhalla.inlinetypes;
25 
26 import compiler.lib.ir_framework.*;
27 import jdk.test.lib.Asserts;
28 
29 /*
30  * @test
31  * @bug 8366879
32  * @summary Test that locks are successfully eliminated by C2.
33  * @library /test/lib  /
34  * @run driver compiler.valhalla.inlinetypes.TestLockElimination
35  */
36 public class TestLockElimination {
37 
38     static class MyClass {
39         public synchronized int val() {
40             return 42;
41         }
42     }
43 
44     @Test
45     @IR(failOn = { IRNode.ALLOC, IRNode.FAST_LOCK, IRNode.FAST_UNLOCK })
46     public static int test(int max) {
47         MyClass obj = new MyClass();
48         int res = 0;
49         for (int i = 0; i < max; i++) {
50             int x = obj.val();
51             int y = obj.val();
52             res += x + y;
53         }
54         return res;
55     }
56 
57     @Run(test = "test")
58     public static void test_runner() {
59         int res = test(3);
60         Asserts.assertEquals(res, 252);
61     }
62 
63     public static void main(String[] args) {
64         TestFramework.run();
65     }
66 }