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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * 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 int
 * @modules java.base/jdk.internal.misc
 * @run testng/othervm -Diters=100   -Xint                   JdkInternalMiscUnsafeAccessTestInt
 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 JdkInternalMiscUnsafeAccessTestInt
 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation  JdkInternalMiscUnsafeAccessTestInt
 * @run testng/othervm -Diters=20000                         JdkInternalMiscUnsafeAccessTestInt
 */

import org.testng.annotations.Test;

import java.lang.reflect.Field;

import static org.testng.Assert.*;

public class JdkInternalMiscUnsafeAccessTestInt {
    static final int ITERS = Integer.getInteger("iters", 1);

    static final jdk.internal.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 = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
            f.setAccessible(true);
            UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
        } catch (Exception e) {
            throw new RuntimeException("Unable to get Unsafe instance.", e);
        }

        try {
            Field staticVField = JdkInternalMiscUnsafeAccessTestInt.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 = JdkInternalMiscUnsafeAccessTestInt.class.getDeclaredField("v");
            V_OFFSET = UNSAFE.objectFieldOffset(vField);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        ARRAY_OFFSET = UNSAFE.arrayBaseOffset(int[].class);
        int ascale = UNSAFE.arrayIndexScale(int[].class);
        ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
    }

    static int static_v;

    int v;

    @Test
    public void testFieldInstance() {
        JdkInternalMiscUnsafeAccessTestInt t = new JdkInternalMiscUnsafeAccessTestInt();
        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() {
        int[] array = new int[10];
        for (int c = 0; c < ITERS; c++) {
            for (int i = 0; i < array.length; i++) {
                testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
            }
        }
    }

    @Test
    public void testArrayOffHeap() {
        int size = 10;
        long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
        try {
            for (int c = 0; c < ITERS; c++) {
                for (int i = 0; i < size; i++) {
                    testAccess(null, (((long) i) << ARRAY_SHIFT) + address);
                }
            }
        } finally {
            UNSAFE.freeMemory(address);
        }
    }

    @Test
    public void testArrayOffHeapDirect() {
        int size = 10;
        long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
        try {
            for (int c = 0; c < ITERS; c++) {
                for (int i = 0; i < size; i++) {
                    testAccess((((long) i) << ARRAY_SHIFT) + address);
                }
            }
        } finally {
            UNSAFE.freeMemory(address);
        }
    }

    static void testAccess(Object base, long offset) {
        // Plain
        {
            UNSAFE.putInt(base, offset, 1);
            int x = UNSAFE.getInt(base, offset);
            assertEquals(x, 1, "set int value");
        }

        // Volatile
        {
            UNSAFE.putIntVolatile(base, offset, 2);
            int x = UNSAFE.getIntVolatile(base, offset);
            assertEquals(x, 2, "putVolatile int value");
        }

        // Lazy
        {
            UNSAFE.putOrderedInt(base, offset, 1);
            int x = UNSAFE.getIntVolatile(base, offset);
            assertEquals(x, 1, "putRelease int value");
        }

        // Unaligned
        {
            UNSAFE.putIntUnaligned(base, offset, 2);
            int x = UNSAFE.getIntUnaligned(base, offset);
            assertEquals(x, 2, "putUnaligned int value");
        }

        {
            UNSAFE.putIntUnaligned(base, offset, 1, true);
            int x = UNSAFE.getIntUnaligned(base, offset, true);
            assertEquals(x, 1, "putUnaligned big endian int value");
        }

        {
            UNSAFE.putIntUnaligned(base, offset, 2, false);
            int x = UNSAFE.getIntUnaligned(base, offset, false);
            assertEquals(x, 2, "putUnaligned little endian int value");
        }

        UNSAFE.putInt(base, offset, 1);

        // Compare
        {
            boolean r = UNSAFE.compareAndSwapInt(base, offset, 1, 2);
            assertEquals(r, true, "success compareAndSwap int");
            int x = UNSAFE.getInt(base, offset);
            assertEquals(x, 2, "success compareAndSwap int value");
        }

        {
            boolean r = UNSAFE.compareAndSwapInt(base, offset, 1, 3);
            assertEquals(r, false, "failing compareAndSwap int");
            int x = UNSAFE.getInt(base, offset);
            assertEquals(x, 2, "failing compareAndSwap int value");
        }

        // Compare set and get
        {
            int o = UNSAFE.getAndSetInt(base, offset, 1);
            assertEquals(o, 2, "getAndSet int");
            int x = UNSAFE.getInt(base, offset);
            assertEquals(x, 1, "getAndSet int value");
        }

        UNSAFE.putInt(base, offset, 1);

        // get and add, add and get
        {
            int o = UNSAFE.getAndAddInt(base, offset, 2);
            assertEquals(o, 1, "getAndAdd int");
            int x = UNSAFE.getInt(base, offset);
            assertEquals(x, 1 + 2, "weakCompareAndSwapRelease int");
        }
    }

    static void testAccess(long address) {
        // Plain
        {
            UNSAFE.putInt(address, 1);
            int x = UNSAFE.getInt(address);
            assertEquals(x, 1, "set int value");
        }
    }
}