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 * @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 } 178