68 lines
2.1 KiB
Java
68 lines
2.1 KiB
Java
/*
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* Copyright (c) 2025, Red Hat, Inc. 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 8358334
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* @summary C2/Shenandoah: incorrect execution with Unsafe
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* @requires vm.gc.Shenandoah
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* @modules java.base/jdk.internal.misc:+open
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*
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* @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation -XX:-TieredCompilation -XX:+UseShenandoahGC
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* TestLostAntiDependencyAtExpansion
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*
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*
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*/
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import jdk.internal.misc.Unsafe;
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public class TestLostAntiDependencyAtExpansion {
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static final jdk.internal.misc.Unsafe UNSAFE = Unsafe.getUnsafe();
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public static void main(String[] args) {
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long addr = UNSAFE.allocateMemory(8);
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for (int i = 0; i < 20_000; i++) {
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UNSAFE.putLong(addr, 42L);
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long res = test1(addr);
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if (res != 42L) {
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throw new RuntimeException("Incorrect result: " + res);
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}
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}
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}
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static class A {
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long field;
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}
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static A a = new A();
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private static long test1(long addr) {
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long tmp = UNSAFE.getLong(addr);
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UNSAFE.putLong(addr, 0L);
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return tmp + a.field;
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}
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}
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