/*

 * Copyright (c) 2006, 2019, 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.

 *

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/**

 * @test

 * @bug     6330997 7025789 8000961 8188870 8193290

 * @summary javac should accept class files with major version of the next release

 * @author  Wei Tao

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

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

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

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

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

 * @clean T1 T2

 * @compile T1.java

 * @compile T2.java

 * @run main/othervm T6330997

 */

import java.nio.*;

import java.io.*;

import java.nio.channels.*;

import com.sun.tools.javac.api.JavacTaskImpl;

import com.sun.tools.javac.code.ClassFinder.BadClassFile;

import com.sun.tools.javac.code.Symtab;

import com.sun.tools.javac.util.Names;

import javax.tools.ToolProvider;

public class T6330997 {

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

        increaseMajor("T1.class", 1);

        increaseMajor("T2.class", 2);

        javax.tools.JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavacTaskImpl task = (JavacTaskImpl)tool.getTask(null, null, null, null, null, null);

        Symtab syms = Symtab.instance(task.getContext());

        Names names = Names.instance(task.getContext());

        task.ensureEntered();

        try {

            syms.enterClass(syms.unnamedModule, names.fromString("T1")).complete();

        } catch (Exception e) {

            e.printStackTrace();

            throw new RuntimeException("Failed: unexpected exception while reading class T1");

        }

        try {

            syms.enterClass(syms.unnamedModule, names.fromString("T2")).complete();

        } catch (BadClassFile e) {

            System.err.println("Passed: expected completion failure " + e.getClass().getName());

            return;

        } catch (Exception e) {

            e.printStackTrace();

            throw new RuntimeException("Failed: unexpected exception while reading class T2");

        }

        throw new RuntimeException("Failed: no error reported");

    }

    // Increase class file cfile's major version by delta

    static void increaseMajor(String cfile, int delta) {

        try (RandomAccessFile cls =

             new RandomAccessFile(new File(System.getProperty("test.classes", "."), cfile), "rw");

             FileChannel fc = cls.getChannel()) {

            ByteBuffer rbuf = ByteBuffer.allocate(2);

            fc.read(rbuf, 6);

            ByteBuffer wbuf = ByteBuffer.allocate(2);

            wbuf.putShort(0, (short)(rbuf.getShort(0) + delta));

            fc.write(wbuf, 6);

            fc.force(false);

        } catch (Exception e){

            throw new RuntimeException("Failed: unexpected exception");

         }

     }

}