/*

 * Copyright (c) 2010, 2015, 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 8004727 8005647

 * @summary javac should generate method parameters correctly.

 * @modules jdk.jdeps

 */

import java.io.*;

import java.util.*;

public class MethodParameters {

    static final String Foo_name = "Foo";

    static final String Foo_contents =

        ("public class Foo {\n" +

         "  Foo() {}\n" +

         "  Foo(int i) {}\n" +

         "  void foo0() {}\n" +

         "  void foo2(int j, int k) {}\n" +

         "}").replaceAll(" +", " ");

    static final String Init0_expected =

        ("  Foo();\n" +

         "    descriptor: ()V\n" +

         "    flags:\n" +

         "    Code:\n" +

         "      stack=1, locals=1, args_size=1\n" +

         "         0: aload_0\n" +

         "         1: invokespecial #1                  // Method java/lang/Object.\"<init>\":()V\n" +

         "         4: return\n" +

         "      LineNumberTable:\n" +

         "        line 2: 0").replaceAll(" +", " ");

    static final String Init1_expected =

        ("  Foo(int);\n" +

         "    descriptor: (I)V\n" +

         "    flags:\n" +

         "    Code:\n" +

         "      stack=1, locals=2, args_size=2\n" +

         "         0: aload_0\n" +

         "         1: invokespecial #1                  // Method java/lang/Object.\"<init>\":()V\n" +

         "         4: return\n" +

         "      LineNumberTable:\n" +

         "        line 3: 0\n" +

         "    MethodParameters:\n" +

         "      Name                                Flags\n" +

         "      i").replaceAll(" +", " ");

    static final String foo0_expected =

        ("  void foo0();\n" +

         "    descriptor: ()V\n" +

         "    flags:\n" +

         "    Code:\n" +

         "      stack=0, locals=1, args_size=1\n" +

         "         0: return\n" +

         "      LineNumberTable:\n" +

         "        line 4: 0").replaceAll(" +", " ");

    static final String foo2_expected =

        ("  void foo2(int, int);\n" +

         "    descriptor: (II)V\n" +

         "    flags:\n" +

         "    Code:\n" +

         "      stack=0, locals=3, args_size=3\n" +

         "         0: return\n" +

         "      LineNumberTable:\n" +

         "        line 5: 0\n" +

         "    MethodParameters:\n" +

         "      Name                                Flags\n" +

         "      j\n" +

         "      k").replaceAll(" +", " ");

    static final File classesdir = new File("methodparameters");

    static final String separator = System.getProperty("line.separator");

    public static void main(String... args) throws Exception {

        new MethodParameters().run();

    }

    void run() throws Exception {

        classesdir.mkdir();

        final File Foo_java =

            writeFile(classesdir, Foo_name + ".java", Foo_contents);

        compile("-parameters", "-d", classesdir.getPath(), Foo_java.getPath());

        System.out.println("Run javap");

        String output =

            javap("-c", "-verbose", "-classpath",

                  classesdir.getPath(), Foo_name);

        String normalized =

            output.replaceAll(separator, "\n").replaceAll(" +", " ");

        if (!normalized.contains(Init0_expected))

            error("Bad output for zero-parameter constructor.  Expected\n" +

                  Init0_expected + "\n" + "but got\n" + normalized);

        if (!normalized.contains(Init1_expected))

           error("Bad output for one-parameter constructor.  Expected\n" +

                 Init1_expected + "\n" + "but got\n" + normalized);

        if (!normalized.contains(foo0_expected))

           error("Bad output for zero-parameter method.  Expected\n" +

                 foo0_expected + "\n" + "but got\n" + normalized);

        if (!normalized.contains(foo2_expected))

           error("Bad output for two-parameter method  Expected\n" +

                 foo2_expected + "\n" + "but got\n" + normalized);

        if (0 != errors)

            throw new Exception("MethodParameters test failed with " +

                                errors + " errors");

    }

    String javap(String... args) {

        StringWriter sw = new StringWriter();

        PrintWriter out = new PrintWriter(sw);

        //sun.tools.javap.Main.entry(args);

        int rc = com.sun.tools.javap.Main.run(args, out);

        if (rc != 0)

            throw new Error("javap failed. rc=" + rc);

        out.close();

        System.out.println(sw);

        return sw.toString();

    }

    String compile(String... args) throws Exception {

        System.err.println("compile: " + Arrays.asList(args));

        StringWriter sw = new StringWriter();

        PrintWriter pw = new PrintWriter(sw);

        int rc = com.sun.tools.javac.Main.compile(args, pw);

        pw.close();

        String out = sw.toString();

        if (out.length() > 0)

            System.err.println(out);

        if (rc != 0)

            error("compilation failed, rc=" + rc);

        return out;

    }

    File writeFile(File dir, String path, String body) throws IOException {

        File f = new File(dir, path);

        f.getParentFile().mkdirs();

        FileWriter out = new FileWriter(f);

        out.write(body);

        out.close();

        return f;

    }

    void error(String msg) {

        System.err.println("Error: " + msg);

        errors++;

    }

    int errors;

}