| /* |
| * Copyright (c) 2025, 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. |
| * |
| * 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 8356246 |
| * @summary Test stacked string concatenations where the toString of the first StringBuilder |
| * is used as a shared test by two diamond Ifs in the second StringBuilder. |
| * @run main/othervm compiler.stringopts.TestStackedConcatsSharedTest |
| * @run main/othervm -XX:-TieredCompilation -Xcomp |
| * -XX:CompileOnly=compiler.stringopts.TestStackedConcatsSharedTest::* |
| * compiler.stringopts.TestStackedConcatsSharedTest |
| */ |
| |
| package compiler.stringopts; |
| |
| public class TestStackedConcatsSharedTest { |
| |
| public static void main(String... args) { |
| f(); // one warmup call |
| String s = f(); |
| if (!s.equals("")) { |
| throw new RuntimeException("wrong result"); |
| } |
| } |
| |
| static String f() { |
| String s = ""; |
| s = new StringBuilder().toString(); |
| // Warming up with many iterations invalidated the optimization due to an unstable If |
| // associated with the valueOf calls below. Using -Xcomp for the test. |
| s = new StringBuilder(String.valueOf(s)).append(String.valueOf(s)).toString(); |
| return s; |
| } |
| } |
