1 /*
   2  * Copyright (c) 2008, 2012, 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 package org.graalvm.compiler.jtt.jdk;
  24 
  25 import java.lang.reflect.Field;
  26 
  27 import org.junit.Test;
  28 
  29 import sun.misc.Unsafe;
  30 
  31 import org.graalvm.compiler.jtt.JTTTest;
  32 
  33 /*
  34  */
  35 public class UnsafeAccess01 extends JTTTest {
  36 
  37     private static int randomValue = 100;
  38     private static final Unsafe unsafe;
  39     private static final long offset;
  40     private static Object staticObject = new TestClass();
  41 
  42     static {
  43         unsafe = getUnsafe();
  44         Field field = null;
  45         try {
  46             field = TestClass.class.getDeclaredField("field");
  47         } catch (NoSuchFieldException e) {
  48         } catch (SecurityException e) {
  49         }
  50         offset = unsafe.objectFieldOffset(field);
  51     }
  52 
  53     private static class TestClass {
  54         private int field = 42;
  55     }
  56 
  57     public static int test() {
  58         final TestClass object = new TestClass();
  59         final int value = unsafe.getInt(object, offset);
  60         return value;
  61     }
  62 
  63     static Unsafe getUnsafe() {
  64         try {
  65             final Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
  66             unsafeField.setAccessible(true);
  67             return (Unsafe) unsafeField.get(null);
  68         } catch (Exception e) {
  69             throw new Error(e);
  70         }
  71     }
  72 
  73     @Test
  74     public void run0() throws Throwable {
  75         runTest("test");
  76     }
  77 
  78     @Test
  79     public void runDiamond() throws Throwable {
  80         runTest("testDiamond");
  81     }
  82 
  83     public static int testDiamond() {
  84 
  85         final Object object = staticObject;
  86         final int oldValue = ((TestClass) object).field;
  87 
  88         if (randomValue == 100) {
  89             unsafe.putInt(object, offset, 41);
  90         } else {
  91             unsafe.putInt(object, offset, 40);
  92         }
  93         unsafe.putInt(object, offset, 42);
  94         return oldValue;
  95     }
  96 }