GetPutShort.java

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/*
 * @test
 * @summary Verify behaviour of Unsafe.get/putShort
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main GetPutShort
 */

import java.lang.reflect.Field;
import jdk.internal.misc.Unsafe;
import static jdk.test.lib.Asserts.*;

public class GetPutShort {
    public static void main(String args[]) throws Exception {
        Unsafe unsafe = Unsafe.getUnsafe();
        Test t = new Test();
        Field field = Test.class.getField("s");

        long offset = unsafe.objectFieldOffset(field);
        assertEquals((short)-1, unsafe.getShort(t, offset));
        unsafe.putShort(t, offset, (short)0);
        assertEquals((short)0, unsafe.getShort(t, offset));

        long address = unsafe.allocateMemory(8);
        unsafe.putShort(address, (short)1);
        assertEquals((short)1, unsafe.getShort(address));
        unsafe.freeMemory(address);

        short arrayShort[] = { -1, 0, 1, 2 };
        int scale = unsafe.arrayIndexScale(arrayShort.getClass());
        offset = unsafe.arrayBaseOffset(arrayShort.getClass());
        for (int i = 0; i < arrayShort.length; i++) {
            assertEquals(unsafe.getShort(arrayShort, offset), arrayShort[i]);
            offset += scale;
        }
    }

    static class Test {
        public short s = -1;
    }
}