/*

 * Copyright (c) 2012, 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.

 *

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 */

/*

 * @test

 * @bug 7190310

 * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops

 * @modules java.base/jdk.internal.misc:+open

 * @modules java.base/java.lang.ref:open

 *

 * @run main/othervm -Xbatch compiler.c2.Test7190310_unsafe

 */

package compiler.c2;

import jdk.internal.misc.Unsafe;

import java.lang.ref.Reference;

import java.lang.ref.WeakReference;

import java.lang.reflect.Field;

public class Test7190310_unsafe {

    static class TestObject {

        public String toString() {

            return "TestObject";

        }

    }

    ;

    private static TestObject str = new TestObject();

    private static final WeakReference ref = new WeakReference(str);

    private TestObject obj;

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

        Class c = Test7190310_unsafe.class.getClassLoader().loadClass("jdk.internal.misc.Unsafe");

        Field f = c.getDeclaredField("theUnsafe");

        f.setAccessible(true);

        Unsafe unsafe = (Unsafe) f.get(c);

        f = Reference.class.getDeclaredField("referent");

        f.setAccessible(true);

        long referent_offset = unsafe.objectFieldOffset(f);

        Test7190310_unsafe t = new Test7190310_unsafe();

        TestObject o = new TestObject();

        t.obj = o;

        // Warmup (compile methods)

        System.err.println("Warmup");

        Object obj = null;

        for (int i = 0; i < 11000; i++) {

            obj = getRef0(ref);

        }

        for (int i = 0; i < 11000; i++) {

            obj = getRef1(unsafe, ref, referent_offset);

        }

        for (int i = 0; i < 11000; i++) {

            obj = getRef2(unsafe, ref, referent_offset);

        }

        for (int i = 0; i < 11000; i++) {

            obj = getRef3(unsafe, ref, referent_offset);

        }

        for (int i = 0; i < 11000; i++) {

            obj = getRef4(unsafe, t, referent_offset);

        }

        // Access verification

        System.err.println("Verification");

        if (!verifyGet(referent_offset, unsafe)) {

            System.exit(97);

        }

        obj = getRef3(unsafe, t, referent_offset);

        if (obj != o) {

            System.exit(97);

        }

        obj = getRef4(unsafe, t, referent_offset);

        if (obj != o) {

            System.exit(97);

        }

    }

    static boolean verifyGet(long referent_offset, Unsafe unsafe) throws Exception {

        // Access verification

        System.out.println("referent: " + str);

        Object obj = getRef0(ref);

        if (obj != str) {

            System.out.println("FAILED: weakRef.get() " + obj + " != " + str);

            return false;

        }

        obj = getRef1(unsafe, ref, referent_offset);

        if (obj != str) {

            return false;

        }

        obj = getRef2(unsafe, ref, referent_offset);

        if (obj != str) {

            return false;

        }

        obj = getRef3(unsafe, ref, referent_offset);

        if (obj != str) {

            return false;

        }

        return true;

    }

    static Object getRef0(WeakReference ref) throws Exception {

        return ref.get();

    }

    static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {

    }

    static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {

    }

    static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {

    }

    static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {

    }

}