/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * 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).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/*

 * @test

 * @bug 8025505

 * @summary Constant folding deficiency

 * @library /tools/lib

 * @modules jdk.compiler/com.sun.tools.javac.api

 *          jdk.compiler/com.sun.tools.javac.file

 *          jdk.compiler/com.sun.tools.javac.main

 * @build ToolBox

 * @run main ConstFoldTest

 */

import java.net.URL;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.List;

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 = tb.new JavapTask()

                .options("-c")

                .classes(file.toString())

                .run()

                .write(ToolBox.OutputKind.DIRECT)

                .getOutputLines(ToolBox.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");

        }

    }

}