58c97205d0
Biased locking's revoke_bias locks monitor in compiled frame with eliminated lock Reviewed-by: kvn, iveresov
71 lines
2.2 KiB
Java
71 lines
2.2 KiB
Java
/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8032011
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* @summary biased locking's revoke_bias locks monitor in compiled frame with eliminated lock
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* @run main/othervm -XX:-UseOnStackReplacement -XX:CompileCommand=dontinline,TestLockEliminatedAtDeopt$A.m2 -XX:-BackgroundCompilation -XX:BiasedLockingStartupDelay=0 TestLockEliminatedAtDeopt
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*
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*/
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public class TestLockEliminatedAtDeopt {
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static class A {
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void m() {
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}
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// This lock is not eliminated but biased to main thread on
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// first call
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synchronized void m2(boolean trap) {
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if (trap) {
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new B();
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}
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}
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}
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static class B extends A {
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void m() {
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}
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}
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static void m1(boolean trap) {
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A a = new A();
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// This lock is eliminated by c2
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synchronized(a) {
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a.m2(trap);
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a.m();
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}
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}
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public static void main(String[] args) {
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for (int i = 0; i < 20000; i++) {
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m1(false);
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}
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// Trigger uncommon trap in A.m2() (class unloaded) and
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// deoptimization of m1() (CHA invalidated). Uncommon trap
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// code locks monitor in m1's frame where's it's eliminated.
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m1(true);
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}
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}
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