| /* |
| * Copyright (c) 2020, Red Hat, Inc. 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 8238384 |
| * @summary CTW: C2 compilation fails with "assert(store != load->find_exact_control(load->in(0))) failed: dependence cycle found" |
| * |
| * @run main/othervm -XX:-BackgroundCompilation TestCopyOfBrokenAntiDependency |
| * |
| */ |
| |
| import java.util.Arrays; |
| |
| public class TestCopyOfBrokenAntiDependency { |
| |
| public static void main(String[] args) { |
| for (int i = 0; i < 20_000; i++) { |
| test(100); |
| } |
| } |
| |
| private static Object test(int length) { |
| Object[] src = new Object[length]; // non escaping |
| final Object[] dst = Arrays.copyOf(src, 10); // can't be removed |
| final Object[] dst2 = Arrays.copyOf(dst, 100); |
| // load is control dependent on membar from previous copyOf |
| // but has memory edge to first copyOf. |
| final Object v = dst[0]; |
| return v; |
| } |
| } |
