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/*
* 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;
}
}
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