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comparison test/compiler/uncommontrap/TestLockEliminatedAtDeopt.java @ 17847:a57ba009d4dc

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8032011: nsk/stress/jck60/jck60022 crashes in src\share\vm\runtime\synchronizer.cpp:239 Summary: biased locking's revoke_bias locks monitor in compiled frame with eliminated lock Reviewed-by: kvn, iveresov
author roland
date Thu, 27 Feb 2014 09:37:16 +0100
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17846:58fab66a8297 17847:a57ba009d4dc
1 /*
2 * Copyright (c) 2014, 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 /*
25 * @test
26 * @bug 8032011
27 * @summary biased locking's revoke_bias locks monitor in compiled frame with eliminated lock
28 * @run main/othervm -XX:-UseOnStackReplacement -XX:CompileCommand=dontinline,TestLockEliminatedAtDeopt$A.m2 -XX:-BackgroundCompilation -XX:BiasedLockingStartupDelay=0 TestLockEliminatedAtDeopt
29 *
30 */
31
32 public class TestLockEliminatedAtDeopt {
33
34 static class A {
35 void m() {
36 }
37
38 // This lock is not eliminated but biased to main thread on
39 // first call
40 synchronized void m2(boolean trap) {
41 if (trap) {
42 new B();
43 }
44 }
45 }
46
47 static class B extends A {
48 void m() {
49 }
50 }
51
52 static void m1(boolean trap) {
53 A a = new A();
54 // This lock is eliminated by c2
55 synchronized(a) {
56 a.m2(trap);
57 a.m();
58 }
59 }
60
61 public static void main(String[] args) {
62 for (int i = 0; i < 20000; i++) {
63 m1(false);
64 }
65 // Trigger uncommon trap in A.m2() (class unloaded) and
66 // deoptimization of m1() (CHA invalidated). Uncommon trap
67 // code locks monitor in m1's frame where's it's eliminated.
68 m1(true);
69 }
70 }