| /* |
| * Copyright (c) 2023, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 8321974 |
| * @summary Test that the TypeAryPtr::_klass field is properly initialized on use. |
| * @comment This test only reproduces the issue with release builds of the JVM because |
| * verification code in debug builds leads to eager initialization of the field. |
| * @run main/othervm -Xbatch -XX:CompileCommand=compileonly,TestUninitializedKlassField::test* |
| * -XX:-TieredCompilation TestUninitializedKlassField |
| */ |
| |
| public class TestUninitializedKlassField { |
| static void test(long array2[]) { |
| long array1[] = new long[1]; |
| // Loop is needed to create a backedge phi that is processed only during IGVN. |
| for (int i = 0; i < 1; i++) { |
| // CmpPNode::sub will check if classes of array1 and array2 are unrelated |
| // and the subtype checks will crash if the _klass field is not initialized. |
| if (array2 != array1) { |
| array1 = new long[2]; |
| } |
| } |
| } |
| |
| public static void main(String[] args) { |
| for (int i = 0; i < 50_000; ++i) { |
| test(null); |
| } |
| } |
| } |
