| /* |
| * Copyright (c) 2014, 2016, 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 8025505 |
| * @summary Constant folding deficiency |
| * @library /tools/lib |
| * @modules jdk.compiler/com.sun.tools.javac.api |
| * jdk.compiler/com.sun.tools.javac.main |
| * jdk.jdeps/com.sun.tools.javap |
| * @build toolbox.ToolBox toolbox.JavapTask |
| * @run main ConstFoldTest |
| */ |
| |
| import java.net.URL; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.List; |
| |
| import toolbox.JavapTask; |
| import toolbox.Task; |
| import toolbox.ToolBox; |
| |
| public class ConstFoldTest { |
| public static void main(String... args) throws Exception { |
| new ConstFoldTest().run(); |
| } |
| |
| // This is the test case. This class should end up |
| // as straight-line code with no conditionals |
| class CFTest { |
| void m() { |
| int x; |
| if (1 != 2) x=1; else x=0; |
| if (1 == 2) x=1; else x=0; |
| if ("" != null) x=1; else x=0; |
| if ("" == null) x=1; else x=0; |
| if (null == null) x=1; else x=0; |
| if (null != null) x=1; else x=0; |
| |
| x = 1 != 2 ? 1 : 0; |
| x = 1 == 2 ? 1 : 0; |
| x = "" != null ? 1 : 0; |
| x = "" == null ? 1 : 0; |
| x = null == null ? 1 : 0; |
| x = null != null ? 1 : 0; |
| |
| boolean b; |
| b = 1 != 2 && true; |
| b = 1 == 2 || true; |
| b = ("" != null) && true; |
| b = ("" == null) || true; |
| b = (null == null) && true; |
| b = (null != null) || true; |
| } |
| } |
| |
| // All of the conditionals above should be eliminated. |
| // these if* bytecodes should not be seen |
| final String regex = "\\sif(?:null|nonnull|eq|ne){1}\\s"; |
| |
| void run() throws Exception { |
| ToolBox tb = new ToolBox(); |
| |
| URL url = ConstFoldTest.class.getResource("ConstFoldTest$CFTest.class"); |
| Path file = Paths.get(url.toURI()); |
| List<String> result = new JavapTask(tb) |
| .options("-c") |
| .classes(file.toString()) |
| .run() |
| .write(Task.OutputKind.DIRECT) |
| .getOutputLines(Task.OutputKind.DIRECT); |
| |
| List<String> bad_codes = tb.grep(regex, result); |
| if (!bad_codes.isEmpty()) { |
| for (String code : bad_codes) |
| System.out.println("Bad OpCode Found: " + code); |
| throw new Exception("constant folding failed"); |
| } |
| } |
| } |