/*

 * Copyright (c) 2015, 2017, 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 8143628

 * @summary Test unsafe access for Object

 *

 * @modules jdk.unsupported/sun.misc

 * @run testng/othervm -Diters=100   -Xint                   compiler.unsafe.SunMiscUnsafeAccessTestObject

 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.SunMiscUnsafeAccessTestObject

 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation  compiler.unsafe.SunMiscUnsafeAccessTestObject

 * @run testng/othervm -Diters=20000                         compiler.unsafe.SunMiscUnsafeAccessTestObject

 */

package compiler.unsafe;

import org.testng.annotations.Test;

import java.lang.reflect.Field;

import static org.testng.Assert.*;

public class SunMiscUnsafeAccessTestObject {

    static final int ITERS = Integer.getInteger("iters", 1);

    static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);

    static final sun.misc.Unsafe UNSAFE;

    static final long V_OFFSET;

    static final Object STATIC_V_BASE;

    static final long STATIC_V_OFFSET;

    static int ARRAY_OFFSET;

    static int ARRAY_SHIFT;

    static {

        try {

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

            f.setAccessible(true);

            UNSAFE = (sun.misc.Unsafe) f.get(null);

        } catch (Exception e) {

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

        }

        try {

            Field staticVField = SunMiscUnsafeAccessTestObject.class.getDeclaredField("static_v");

            STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField);

            STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField);

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

        try {

            Field vField = SunMiscUnsafeAccessTestObject.class.getDeclaredField("v");

            V_OFFSET = UNSAFE.objectFieldOffset(vField);

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

        ARRAY_OFFSET = UNSAFE.arrayBaseOffset(Object[].class);

        int ascale = UNSAFE.arrayIndexScale(Object[].class);

        ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);

    }

    static Object static_v;

    Object v;

    @Test

    public void testFieldInstance() {

        SunMiscUnsafeAccessTestObject t = new SunMiscUnsafeAccessTestObject();

        for (int c = 0; c < ITERS; c++) {

            testAccess(t, V_OFFSET);

        }

    }

    @Test

    public void testFieldStatic() {

        for (int c = 0; c < ITERS; c++) {

            testAccess(STATIC_V_BASE, STATIC_V_OFFSET);

        }

    }

    @Test

    public void testArray() {

        Object[] array = new Object[10];

        for (int c = 0; c < ITERS; c++) {

            for (int i = 0; i < array.length; i++) {

                testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);

            }

        }

    }

    static void testAccess(Object base, long offset) {

        // Plain

        {

            UNSAFE.putObject(base, offset, "foo");

            Object x = UNSAFE.getObject(base, offset);

            assertEquals(x, "foo", "set Object value");

        }

        // Volatile

        {

            UNSAFE.putObjectVolatile(base, offset, "bar");

            Object x = UNSAFE.getObjectVolatile(base, offset);

            assertEquals(x, "bar", "putVolatile Object value");

        }

        // Lazy

        {

            UNSAFE.putOrderedObject(base, offset, "foo");

            Object x = UNSAFE.getObjectVolatile(base, offset);

            assertEquals(x, "foo", "putRelease Object value");

        }

        UNSAFE.putObject(base, offset, "foo");

        // Compare

        {

            boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "bar");

            assertEquals(r, true, "success compareAndSwap Object");

            Object x = UNSAFE.getObject(base, offset);

            assertEquals(x, "bar", "success compareAndSwap Object value");

        }

        {

            boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "baz");

            assertEquals(r, false, "failing compareAndSwap Object");

            Object x = UNSAFE.getObject(base, offset);

            assertEquals(x, "bar", "failing compareAndSwap Object value");

        }

        UNSAFE.putObject(base, offset, "bar");

        // Compare set and get

        {

            Object o = UNSAFE.getAndSetObject(base, offset, "foo");

            assertEquals(o, "bar", "getAndSet Object");

            Object x = UNSAFE.getObject(base, offset);

            assertEquals(x, "foo", "getAndSet Object value");

        }

    }

}