1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 /**
  26  * @test
  27  * @bug 8136473
  28  * @summary Mismatched stores on same slice possible with Unsafe.Put*Unaligned methods
  29  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation TestUnalignedStoreIThenStoreB
  30  *
  31  */
  32 
  33 import java.lang.reflect.*;
  34 import sun.misc.Unsafe;
  35 
  36 public class TestUnalignedStoreIThenStoreB {
  37 
  38     private static final Unsafe UNSAFE;
  39 
  40     static {
  41         try {
  42             Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
  43             unsafeField.setAccessible(true);
  44             UNSAFE = (Unsafe) unsafeField.get(null);
  45         }
  46         catch (Exception e) {
  47             throw new AssertionError(e);
  48         }
  49     }
  50 
  51     static void test1(byte[] array) {
  52         array[0] = 0;
  53         UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET, 0);
  54         array[0] = 0;
  55     }
  56 
  57     // unaligned access and non escaping allocation
  58     static void test2() {
  59         byte[] array = new byte[10];
  60         UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);
  61         array[0] = 0;
  62     }
  63 
  64     // unaligned access and non escaping allocation
  65     static int test3() {
  66         byte[] array = new byte[10];
  67         UNSAFE.putIntUnaligned(array, UNSAFE.ARRAY_BYTE_BASE_OFFSET+1, -1);
  68         array[0] = 0;
  69         array[2] = 0;
  70         return array[0] + array[1] + array[2] + array[3] + array[4];
  71     }
  72 
  73     // unaligned access with vectorization
  74     static void test4(int[] src1, int[] src2, int[] dst) {
  75         for (int i = 0; i < dst.length-1; i++) {
  76             int res = src1[i] + src2[i];
  77             UNSAFE.putIntUnaligned(dst, UNSAFE.ARRAY_INT_BASE_OFFSET + i*4+1, res);
  78         }
  79     }
  80 
  81     static public void main(String[] args) {
  82         byte[] byte_array = new byte[100];
  83         int[] int_array = new int[100];
  84         for (int i = 0; i < 20000; i++) {
  85             test1(byte_array);
  86             test2();
  87             test3();
  88             test4(int_array, int_array, int_array);
  89         }
  90     }
  91 }