69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
/*
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* Copyright (c) 2023, 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 8313262
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* @summary Sinking node may cause required cast to be dropped
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* @requires vm.gc.Shenandoah
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* @run main/othervm -XX:-BackgroundCompilation -XX:+UseShenandoahGC TestSinkingNodeDropsNotNullCast
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*/
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import java.util.Arrays;
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public class TestSinkingNodeDropsNotNullCast {
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public static void main(String[] args) {
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Object[] array1 = new Object[100];
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Object[] array2 = new Object[100];
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Arrays.fill(array2, new Object());
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for (int i = 0; i < 20_000; i++) {
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test(array1);
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test(array1);
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test(array2);
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}
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}
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private static Object test(Object[] array) {
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Object o;
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int i = 1;
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do {
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synchronized (new Object()) {
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}
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o = array[i];
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if (o != null) {
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if (o instanceof A) {
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return ((A) o).field;
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} else {
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return o;
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}
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}
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i++;
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} while (i < 100);
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return o;
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}
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private static class A {
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Object field;
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}
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}
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