1 /*
   2  * Copyright (c) 2015, 2016, 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  * @test
  26  * @library /test/lib
  27  * @modules java.base/jdk.internal.misc
  28  *          java.management
  29  * @compile -XDenableValueTypes -XDallowFlattenabilityModifiers GetPutInt.java
  30  * @run main/othervm -XX:+EnableValhalla GetPutInt
  31  */
  32 
  33 import java.lang.reflect.Field;
  34 import jdk.internal.misc.Unsafe;
  35 import static jdk.test.lib.Asserts.*;
  36 
  37 public class GetPutInt {
  38     public static void main(String args[]) throws Exception {
  39         Unsafe unsafe = Unsafe.getUnsafe();
  40         Test t = new Test();
  41         Field field = Test.class.getField("i");
  42 
  43         long offset = unsafe.objectFieldOffset(field);
  44         assertEquals(-1, unsafe.getInt(t, offset));
  45         unsafe.putInt(t, offset, 0);
  46         assertEquals(0, unsafe.getInt(t, offset));
  47 
  48         long address = unsafe.allocateMemory(8);
  49         unsafe.putInt(address, 1);
  50         assertEquals(1, unsafe.getInt(address));
  51         unsafe.freeMemory(address);
  52 
  53         int arrayInt[] = { -1, 0, 1, 2 };
  54         int scale = unsafe.arrayIndexScale(arrayInt.getClass());
  55         offset = unsafe.arrayBaseOffset(arrayInt.getClass());
  56         for (int i = 0; i < arrayInt.length; i++) {
  57             assertEquals(unsafe.getInt(arrayInt, offset), arrayInt[i]);
  58             offset += scale;
  59         }
  60 
  61         Point p = Point.createPoint(5, 3);
  62         boolean exceptionThrown = false;
  63         
  64         Field xField = Point.class.getField("x");
  65         long offset2 = unsafe.objectFieldOffset(xField);
  66 
  67         try {
  68             unsafe.putInt(p, offset2, 8);
  69         } catch(IllegalAccessError e) {
  70             exceptionThrown = true;
  71         }
  72         assertTrue(exceptionThrown, "IAE not thrown when writing to a value instance field");
  73     }
  74 
  75     static class Test {
  76         public int i = -1;
  77     }
  78 
  79     static  __ByValue final class Point {
  80         public final int x;
  81         public final int y;
  82 
  83         private Point() {
  84             x = 0;
  85             y = 0;
  86         }
  87 
  88         public static Point createPoint(int x, int y) {
  89             Point p = __MakeDefault Point();
  90             p = __WithField(p.x, x);
  91             p = __WithField(p.y, y);
  92             return p;
  93         }
  94     }
  95 }