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