/*

 * 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 8000518

 * @summary Javac generates duplicate name_and_type constant pool entry for

 * class BinaryOpValueExp.java

 * @run main DuplicateConstantPoolEntry

 */

import com.sun.source.util.JavacTask;

import com.sun.tools.classfile.ClassFile;

import com.sun.tools.classfile.ConstantPoolException;

import java.io.File;

import java.io.IOException;

import java.net.URI;

import java.util.Arrays;

import java.util.List;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.ToolProvider;

/*

 * This bug was reproduced having two classes B and C referenced from a class A

 * class C should be compiled and generated in advance. Later class A and B should

 * be compiled like this: javac A.java B.java

 */

public class DuplicateConstantPoolEntry {

    public static void main(String args[]) throws Exception {

        new DuplicateConstantPoolEntry().run();

    }

    void run() throws Exception {

        generateFilesNeeded();

        checkReference();

    }

    void generateFilesNeeded() throws Exception {

        StringJavaFileObject[] CSource = new StringJavaFileObject[] {

            new StringJavaFileObject("C.java",

                "class C {C(String s) {}}"),

        };

        List<StringJavaFileObject> AandBSource = Arrays.asList(

                new StringJavaFileObject("A.java",

                    "class A {void test() {new B(null);new C(null);}}"),

                new StringJavaFileObject("B.java",

                    "class B {B(String s) {}}")

        );

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavacTask compileC = (JavacTask)tool.getTask(null, null, null, null, null,

                Arrays.asList(CSource));

        if (!compileC.call()) {

            throw new AssertionError("Compilation error while compiling C.java sources");

        }

        JavacTask compileAB = (JavacTask)tool.getTask(null, null, null,

                Arrays.asList("-cp", "."), null, AandBSource);

        if (!compileAB.call()) {

            throw new AssertionError("Compilation error while compiling A and B sources");

        }

    }

    void checkReference() throws IOException, ConstantPoolException {

        File file = new File("A.class");

        ClassFile classFile = ClassFile.read(file);

        for (int i = 1;

                i < classFile.constant_pool.size() - 1;

                i += classFile.constant_pool.get(i).size()) {

            for (int j = i + classFile.constant_pool.get(i).size();

                    j < classFile.constant_pool.size();

                    j += classFile.constant_pool.get(j).size()) {

                if (classFile.constant_pool.get(i).toString().

                        equals(classFile.constant_pool.get(j).toString())) {

                    throw new AssertionError(

                            "Duplicate entries in the constant pool at positions " +

                            i + " and " + j);

                }

            }

        }

    }

    private static class StringJavaFileObject extends SimpleJavaFileObject {

        StringJavaFileObject(String name, String text) {

            super(URI.create(name), JavaFileObject.Kind.SOURCE);

            this.text = text;

        }

        @Override

        public CharSequence getCharContent(boolean b) {

            return text;

        }

        private String text;

    }

}