/*

 * Copyright (c) 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 8148752

 * @summary Test correct casting of MH arguments during inlining.

 *

 * @run main compiler.jsr292.LongReferenceCastingTest

 */

package compiler.jsr292;

import java.lang.invoke.MethodHandle;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodType;

public class LongReferenceCastingTest {

    static final String MY_STRING = "myString";

    static final MethodHandle MH;

    static {

        try {

            MethodHandles.Lookup lookup = MethodHandles.lookup();

            MethodType mt = MethodType.methodType(String.class, long.class, Object.class, String.class);

            MH = lookup.findVirtual(LongReferenceCastingTest.class, "myMethod", mt);

        } catch (Exception e) {

            throw new Error(e);

        }

    }

    public String myMethod(long l, Object o, String s) {

        // The long argument occupies two stack slots, causing C2 to treat it as

        // two arguments and casting the fist one two long and the second one to Object.

        // As a result, Object o is casted to String and the o.toString() call is

        // inlined as String::toString(). We fail at runtime because 'o' is not a String.

        return o.toString();

    }

    public String toString() {

        return MY_STRING;

    }

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

        LongReferenceCastingTest test = new LongReferenceCastingTest();

        try {

            for (int i = 0; i < 20_000; ++i) {

                if (!test.invoke().equals(MY_STRING)) {

                    throw new RuntimeException("Invalid string");

                }

            }

        } catch (Throwable t) {

            throw new RuntimeException("Test failed", t);

        }

    }

    public String invoke() throws Throwable {

        return (String) MH.invokeExact(this, 0L, (Object)this, MY_STRING);

    }

}