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