/*

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 * 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 DefineAnon

 * @bug 8058575

 * @library /testlibrary

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

 *          java.management

 * @compile -XDignore.symbol.file=true DefineAnon.java

 * @run main/othervm p1.DefineAnon

 */

package p1;

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

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

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

import sun.misc.Unsafe;

class T {

    static           protected void test0() { System.out.println("test0 (public)"); }

    static           protected void test1() { System.out.println("test1 (protected)"); }

    static /*package-private*/ void test2() { System.out.println("test2 (package)"); }

    static             private void test3() { System.out.println("test3 (private)"); }

}

public class DefineAnon {

    private static Unsafe getUnsafe() {

        try {

            java.lang.reflect.Field singleoneInstanceField = Unsafe.class.getDeclaredField("theUnsafe");

            singleoneInstanceField.setAccessible(true);

            return (Unsafe) singleoneInstanceField.get(null);

        } catch (Throwable ex) {

            throw new RuntimeException("Was unable to get Unsafe instance.");

        }

    }

    static Unsafe UNSAFE = DefineAnon.getUnsafe();

    static Class<?> getAnonClass(Class<?> hostClass, final String className) {

        final String superName = "java/lang/Object";

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);

        cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, className, null, superName, null);

        MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, "test", "()V", null, null);

        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test0", "()V", false);

        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test1", "()V", false);

        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test2", "()V", false);

        mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test3", "()V", false);

        mv.visitInsn(Opcodes.RETURN);

        mv.visitMaxs(0, 0);

        mv.visitEnd();

        final byte[] classBytes = cw.toByteArray();

        Class<?> invokerClass = UNSAFE.defineAnonymousClass(hostClass, classBytes, new Object[0]);

        UNSAFE.ensureClassInitialized(invokerClass);

        return invokerClass;

    }

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

        Throwable fail = null;

        // Anonymous class has the privileges of its host class, so test[0123] should all work.

        System.out.println("Injecting from the same package (p1):");

        Class<?> p1cls = getAnonClass(T.class, "p1/AnonClass");

        try {

            p1cls.getMethod("test").invoke(null);

        } catch (Throwable ex) {

            ex.printStackTrace();

            fail = ex;  // throw this to make test fail, since subtest failed

        }

        // Anonymous class has different package name from host class.  Should throw

        // IllegalArgumentException.

        System.out.println("Injecting from the wrong package (p2):");

        try {

            Class<?> p2cls = getAnonClass(DefineAnon.class, "p2/AnonClass");

            p2cls.getMethod("test").invoke(null);

            System.out.println("Failed, did not get expected IllegalArgumentException");

        } catch (java.lang.IllegalArgumentException e) {

            if (e.getMessage().contains("Host class p1/DefineAnon and anonymous class p2/AnonClass")) {

                System.out.println("Got expected IllegalArgumentException: " + e.getMessage());

            } else {

                throw new RuntimeException("Unexpected message: " + e.getMessage());

            }

        } catch (Throwable ex) {

            ex.printStackTrace();

            fail = ex;  // throw this to make test fail, since subtest failed

        }

        // Inject a class in the unnamed package into p1.T.  It should be able

        // to access all methods in p1.T.

        System.out.println("Injecting unnamed package into correct host class:");

        try {

            Class<?> p3cls = getAnonClass(T.class, "AnonClass");

            p3cls.getMethod("test").invoke(null);

        } catch (Throwable ex) {

            ex.printStackTrace();

            fail = ex;  // throw this to make test fail, since subtest failed

        }

        // Try using an array class as the host class.  This should throw IllegalArgumentException.

        try {

            Class<?> p3cls = getAnonClass(String[].class, "AnonClass");

            throw new RuntimeException("Expected IllegalArgumentException not thrown");

        } catch (IllegalArgumentException ex) {

        }

        if (fail != null) throw fail;  // make test fail, since subtest failed

    }

}