1 /*
   2  * Copyright (c) 2015, 2017, 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  * @bug 8143628
  27  * @summary Test unsafe access for float
  28  *
  29  * @modules jdk.unsupported/sun.misc
  30  * @run testng/othervm -Diters=100   -Xint                   compiler.unsafe.SunMiscUnsafeAccessTestFloat
  31  * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.SunMiscUnsafeAccessTestFloat
  32  * @run testng/othervm -Diters=20000 -XX:-TieredCompilation  compiler.unsafe.SunMiscUnsafeAccessTestFloat
  33  * @run testng/othervm -Diters=20000                         compiler.unsafe.SunMiscUnsafeAccessTestFloat
  34  */
  35 
  36 package compiler.unsafe;
  37 
  38 import org.testng.annotations.Test;
  39 
  40 import java.lang.reflect.Field;
  41 
  42 import static org.testng.Assert.*;
  43 
  44 public class SunMiscUnsafeAccessTestFloat {
  45     static final int ITERS = Integer.getInteger("iters", 1);
  46     static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
  47 
  48     static final sun.misc.Unsafe UNSAFE;
  49 
  50     static final long V_OFFSET;
  51 
  52     static final Object STATIC_V_BASE;
  53 
  54     static final long STATIC_V_OFFSET;
  55 
  56     static int ARRAY_OFFSET;
  57 
  58     static int ARRAY_SHIFT;
  59 
  60     static {
  61         try {
  62             Field f = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
  63             f.setAccessible(true);
  64             UNSAFE = (sun.misc.Unsafe) f.get(null);
  65         } catch (Exception e) {
  66             throw new RuntimeException("Unable to get Unsafe instance.", e);
  67         }
  68 
  69         try {
  70             Field staticVField = SunMiscUnsafeAccessTestFloat.class.getDeclaredField("static_v");
  71             STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField);
  72             STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField);
  73         } catch (Exception e) {
  74             throw new RuntimeException(e);
  75         }
  76 
  77         try {
  78             Field vField = SunMiscUnsafeAccessTestFloat.class.getDeclaredField("v");
  79             V_OFFSET = UNSAFE.objectFieldOffset(vField);
  80         } catch (Exception e) {
  81             throw new RuntimeException(e);
  82         }
  83 
  84         ARRAY_OFFSET = UNSAFE.arrayBaseOffset(float[].class);
  85         int ascale = UNSAFE.arrayIndexScale(float[].class);
  86         ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
  87     }
  88 
  89     static float static_v;
  90 
  91     float v;
  92 
  93     @Test
  94     public void testFieldInstance() {
  95         SunMiscUnsafeAccessTestFloat t = new SunMiscUnsafeAccessTestFloat();
  96         for (int c = 0; c < ITERS; c++) {
  97             testAccess(t, V_OFFSET);
  98         }
  99     }
 100 
 101     @Test
 102     public void testFieldStatic() {
 103         for (int c = 0; c < ITERS; c++) {
 104             testAccess(STATIC_V_BASE, STATIC_V_OFFSET);
 105         }
 106     }
 107 
 108     @Test
 109     public void testArray() {
 110         float[] array = new float[10];
 111         for (int c = 0; c < ITERS; c++) {
 112             for (int i = 0; i < array.length; i++) {
 113                 testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
 114             }
 115         }
 116     }
 117 
 118     @Test
 119     public void testArrayOffHeap() {
 120         int size = 10;
 121         long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
 122         try {
 123             for (int c = 0; c < ITERS; c++) {
 124                 for (int i = 0; i < size; i++) {
 125                     testAccess(null, (((long) i) << ARRAY_SHIFT) + address);
 126                 }
 127             }
 128         } finally {
 129             UNSAFE.freeMemory(address);
 130         }
 131     }
 132 
 133     @Test
 134     public void testArrayOffHeapDirect() {
 135         int size = 10;
 136         long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
 137         try {
 138             for (int c = 0; c < ITERS; c++) {
 139                 for (int i = 0; i < size; i++) {
 140                     testAccess((((long) i) << ARRAY_SHIFT) + address);
 141                 }
 142             }
 143         } finally {
 144             UNSAFE.freeMemory(address);
 145         }
 146     }
 147 
 148     static void testAccess(Object base, long offset) {
 149         // Plain
 150         {
 151             UNSAFE.putFloat(base, offset, 1.0f);
 152             float x = UNSAFE.getFloat(base, offset);
 153             assertEquals(x, 1.0f, "set float value");
 154         }
 155 
 156         // Volatile
 157         {
 158             UNSAFE.putFloatVolatile(base, offset, 2.0f);
 159             float x = UNSAFE.getFloatVolatile(base, offset);
 160             assertEquals(x, 2.0f, "putVolatile float value");
 161         }
 162 
 163 
 164 
 165 
 166 
 167     }
 168 
 169     static void testAccess(long address) {
 170         // Plain
 171         {
 172             UNSAFE.putFloat(address, 1.0f);
 173             float x = UNSAFE.getFloat(address);
 174             assertEquals(x, 1.0f, "set float value");
 175         }
 176     }
 177 }