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/*

 * @test

 * @bug 8143628

 * @summary Test unsafe access for byte

 *

 * @modules jdk.unsupported/sun.misc

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

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

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

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

 */

package compiler.unsafe;

import org.testng.annotations.Test;

import java.lang.reflect.Field;

import static org.testng.Assert.*;

public class SunMiscUnsafeAccessTestByte {

    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 = SunMiscUnsafeAccessTestByte.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 = SunMiscUnsafeAccessTestByte.class.getDeclaredField("v");

            V_OFFSET = UNSAFE.objectFieldOffset(vField);

        } catch (Exception e) {

            throw new RuntimeException(e);

        }

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

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

        ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);

    }

    static byte static_v;

    byte v;

    @Test

    public void testFieldInstance() {

        SunMiscUnsafeAccessTestByte t = new SunMiscUnsafeAccessTestByte();

        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() {

        byte[] array = new byte[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.putByte(base, offset, (byte)0x01);

            byte x = UNSAFE.getByte(base, offset);

            assertEquals(x, (byte)0x01, "set byte value");

        }

        // Volatile

        {

            UNSAFE.putByteVolatile(base, offset, (byte)0x23);

            byte x = UNSAFE.getByteVolatile(base, offset);

            assertEquals(x, (byte)0x23, "putVolatile byte value");

        }

    }

    static void testAccess(long address) {

        // Plain

        {

            UNSAFE.putByte(address, (byte)0x01);

            byte x = UNSAFE.getByte(address);

            assertEquals(x, (byte)0x01, "set byte value");

        }

    }

}