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96 lines
3.6 KiB
Java
96 lines
3.6 KiB
Java
/*
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* Copyright (c) 2025, 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 8362394
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* @summary Test that repeated stacked string concatenations do not
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* consume too many compilation resources.
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* @requires vm.compiler2.enabled
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* @library /test/lib /
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* @run main/othervm -XX:-OptoScheduling compiler.stringopts.TestStackedConcatsMany
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* @run main/othervm -XX:-TieredCompilation -Xcomp -XX:-OptoScheduling
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* -XX:CompileOnly=compiler.stringopts.TestStackedConcatsMany::f
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* compiler.stringopts.TestStackedConcatsMany
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*/
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// The test uses -XX:-OptoScheduling to avoid the assert "too many D-U pinch points" on aarch64 (JDK-8328078).
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package compiler.stringopts;
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import jdk.test.lib.Asserts;
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public class TestStackedConcatsMany {
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public static void main (String... args) {
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new StringBuilder(); // Trigger loading of the StringBuilder class.
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String s = f();
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String z = "xy";
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for (int i = 0; i < 24; i++) {
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z = z + z;
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}
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Asserts.assertEQ(s, z);
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}
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static String f() {
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String s = "xy";
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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s = new StringBuilder().append(s).append(s).toString();
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return s;
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}
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}
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