/*

 * Copyright (c) 2014, 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 8028553

 * @summary Test that VerifyError is not thrown when 'overriding' a static method.

 * @modules java.base/jdk.internal.org.objectweb.asm

 * @run main FinalStatic

 */

import java.lang.reflect.*;

import jdk.internal.org.objectweb.asm.ClassWriter;

import jdk.internal.org.objectweb.asm.MethodVisitor;

import jdk.internal.org.objectweb.asm.Opcodes;

/*

 *  class A { static final int m() {return FAIL; } }

 *  class B extends A { int m() { return PASS; } }

 *  class FinalStatic {

 *      public static void main () {

 *          Object b = new B();

 *          b.m();

 *      }

 *  }

 */

public class FinalStatic {

    static final String CLASS_NAME_A = "A";

    static final String CLASS_NAME_B = "B";

    static final int FAILED = 0;

    static final int EXPECTED = 1234;

    static class TestClassLoader extends ClassLoader implements Opcodes {

        @Override

        public Class findClass(String name) throws ClassNotFoundException {

            byte[] b;

            try {

                b = loadClassData(name);

            } catch (Throwable th) {

                // th.printStackTrace();

                throw new ClassNotFoundException("Loading error", th);

            }

            return defineClass(name, b, 0, b.length);

        }

        private byte[] loadClassData(String name) throws Exception {

            ClassWriter cw = new ClassWriter(0);

            MethodVisitor mv;

            switch (name) {

               case CLASS_NAME_A:

                    cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME_A, null, "java/lang/Object", null);

                    {

                        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);

                        mv.visitCode();

                        mv.visitVarInsn(ALOAD, 0);

                        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");

                        mv.visitInsn(RETURN);

                        mv.visitMaxs(1, 1);

                        mv.visitEnd();

                        mv = cw.visitMethod(ACC_FINAL | ACC_STATIC, "m", "()I", null, null);

                        mv.visitCode();

                        mv.visitLdcInsn(FAILED);

                        mv.visitInsn(IRETURN);

                        mv.visitMaxs(1, 1);

                        mv.visitEnd();

                    }

                    break;

                case CLASS_NAME_B:

                    cw.visit(52, ACC_SUPER | ACC_PUBLIC, CLASS_NAME_B, null, CLASS_NAME_A, null);

                    {

                        mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);

                        mv.visitCode();

                        mv.visitVarInsn(ALOAD, 0);

                        mv.visitMethodInsn(INVOKESPECIAL, CLASS_NAME_A, "<init>", "()V");

                        mv.visitInsn(RETURN);

                        mv.visitMaxs(1, 1);

                        mv.visitEnd();

                        mv = cw.visitMethod(ACC_PUBLIC, "m", "()I", null, null);

                        mv.visitCode();

                        mv.visitLdcInsn(EXPECTED);

                        mv.visitInsn(IRETURN);

                        mv.visitMaxs(1, 1);

                        mv.visitEnd();

                    }

                    break;

                default:

                    break;

            }

            cw.visitEnd();

            return cw.toByteArray();

        }

    }

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

        TestClassLoader tcl = new TestClassLoader();

        Class<?> a = tcl.loadClass(CLASS_NAME_A);

        Class<?> b = tcl.loadClass(CLASS_NAME_B);

        Object inst = b.newInstance();

        Method[] meths = b.getDeclaredMethods();

        Method m = meths[0];

        int mod = m.getModifiers();

        if ((mod & Modifier.FINAL) != 0) {

            throw new Exception("FAILED: " + m + " is FINAL");

        }

        if ((mod & Modifier.STATIC) != 0) {

            throw new Exception("FAILED: " + m + " is STATIC");

        }

        m.setAccessible(true);

        if (!m.invoke(inst).equals(EXPECTED)) {

              throw new Exception("FAILED: " + EXPECTED + " from " + m);

        }

        System.out.println("Passed.");

    }

}