/*

 * Copyright (c) 2014, 2016, 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 8046903

 * @summary VM anonymous class members can't be statically invocable

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

 * @run junit test.java.lang.invoke.VMAnonymousClass

 */

package test.java.lang.invoke;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodType;

import java.lang.reflect.Field;

import org.junit.Test;

import jdk.internal.misc.Unsafe;

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

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

public class VMAnonymousClass {

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

        VMAnonymousClass test = new VMAnonymousClass();

        test.testJavaLang();

        test.testJavaUtil();

        test.testJdkInternalMisc();

        test.testJavaLangInvoke();

        test.testProhibitedJavaPkg();

        System.out.println("TEST PASSED");

    }

    // Test VM anonymous classes from different packages

    // (see j.l.i.InvokerBytecodeGenerator::isStaticallyInvocable).

    @Test public void testJavaLang()        throws Throwable { test("java/lang");         }

    @Test public void testJavaUtil()        throws Throwable { test("java/util");         }

    @Test public void testJdkInternalMisc() throws Throwable { test("jdk/internal/misc"); }

    @Test public void testJavaLangInvoke()  throws Throwable { test("java/lang/invoke");  }

    @Test public void testProhibitedJavaPkg() throws Throwable {

       try {

       }

       throw new RuntimeException("Expected SecurityException");

     }

    private static Unsafe unsafe = getUnsafe();

    private static void test(String pkg) throws Throwable {

        byte[] bytes = dumpClass(pkg);

        Class host_class;

        if (pkg.equals("java/prohibited")) {

            VMAnonymousClass sampleclass = new VMAnonymousClass();

            host_class = (Class)sampleclass.getClass();

        } else {

        }

        // Define VM anonymous class

        Class anonClass = unsafe.defineAnonymousClass(host_class, bytes, null);

        MethodType t = MethodType.methodType(Object.class, int.class);

        MethodHandle target = MethodHandles.lookup().findStatic(anonClass, "get", t);

        // Wrap target into LF (convert) to get "target" referenced from LF

        MethodHandle wrappedMH = target.asType(MethodType.methodType(Object.class, Integer.class));

        // Invoke enough times to provoke LF compilation to bytecode.

        for (int i = 0; i<100; i++) {

            Object r = wrappedMH.invokeExact((Integer)1);

        }

    }

    /*

     * Constructs bytecode for the following class:

     * public class pkg.MyClass {

     *     MyClass() {}

     *     public Object get(int i) { return null; }

     * }

     */

    public static byte[] dumpClass(String pkg) {

        ClassWriter cw = new ClassWriter(0);

        MethodVisitor mv;

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

        {

            mv = cw.visitMethod(0, "<init>", "()V", null, null);

            mv.visitCode();

            mv.visitVarInsn(ALOAD, 0);

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

            mv.visitInsn(RETURN);

            mv.visitMaxs(1, 1);

            mv.visitEnd();

        }

        {

            mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "get", "(I)Ljava/lang/Object;", null, null);

            mv.visitCode();

            mv.visitInsn(ACONST_NULL);

            mv.visitInsn(ARETURN);

            mv.visitMaxs(1, 1);

            mv.visitEnd();

        }

        cw.visitEnd();

        return cw.toByteArray();

    }

    private static synchronized Unsafe getUnsafe() {

        try {

            Field f = Unsafe.class.getDeclaredField("theUnsafe");

            f.setAccessible(true);

            return (Unsafe) f.get(null);

        } catch (NoSuchFieldException | IllegalAccessException e) {

            throw new RuntimeException("Unable to get Unsafe instance.", e);

        }

    }

}