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1 /* |
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @bug 8143628 |
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27 * @summary Test unsafe access for byte |
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28 * @modules java.base/jdk.internal.misc |
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29 * @run testng/othervm -Diters=100 -Xint JdkInternalMiscUnsafeAccessTestByte |
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30 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 JdkInternalMiscUnsafeAccessTestByte |
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31 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation JdkInternalMiscUnsafeAccessTestByte |
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32 * @run testng/othervm -Diters=20000 JdkInternalMiscUnsafeAccessTestByte |
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33 */ |
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34 |
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35 import org.testng.annotations.Test; |
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36 |
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37 import java.lang.reflect.Field; |
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38 |
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39 import static org.testng.Assert.*; |
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40 |
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41 public class JdkInternalMiscUnsafeAccessTestByte { |
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42 static final int ITERS = Integer.getInteger("iters", 1); |
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43 |
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44 static final jdk.internal.misc.Unsafe UNSAFE; |
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45 |
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46 static final long V_OFFSET; |
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47 |
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48 static final Object STATIC_V_BASE; |
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49 |
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50 static final long STATIC_V_OFFSET; |
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51 |
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52 static int ARRAY_OFFSET; |
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53 |
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54 static int ARRAY_SHIFT; |
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55 |
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56 static { |
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57 try { |
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58 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
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59 f.setAccessible(true); |
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60 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); |
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61 } catch (Exception e) { |
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62 throw new RuntimeException("Unable to get Unsafe instance.", e); |
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63 } |
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64 |
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65 try { |
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66 Field staticVField = JdkInternalMiscUnsafeAccessTestByte.class.getDeclaredField("static_v"); |
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67 STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField); |
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68 STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField); |
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69 } catch (Exception e) { |
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70 throw new RuntimeException(e); |
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71 } |
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72 |
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73 try { |
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74 Field vField = JdkInternalMiscUnsafeAccessTestByte.class.getDeclaredField("v"); |
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75 V_OFFSET = UNSAFE.objectFieldOffset(vField); |
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76 } catch (Exception e) { |
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77 throw new RuntimeException(e); |
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78 } |
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79 |
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80 ARRAY_OFFSET = UNSAFE.arrayBaseOffset(byte[].class); |
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81 int ascale = UNSAFE.arrayIndexScale(byte[].class); |
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82 ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale); |
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83 } |
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84 |
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85 static byte static_v; |
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86 |
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87 byte v; |
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88 |
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89 @Test |
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90 public void testFieldInstance() { |
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91 JdkInternalMiscUnsafeAccessTestByte t = new JdkInternalMiscUnsafeAccessTestByte(); |
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92 for (int c = 0; c < ITERS; c++) { |
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93 testAccess(t, V_OFFSET); |
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94 } |
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95 } |
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96 |
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97 @Test |
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98 public void testFieldStatic() { |
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99 for (int c = 0; c < ITERS; c++) { |
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100 testAccess(STATIC_V_BASE, STATIC_V_OFFSET); |
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101 } |
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102 } |
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103 |
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104 @Test |
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105 public void testArray() { |
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106 byte[] array = new byte[10]; |
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107 for (int c = 0; c < ITERS; c++) { |
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108 for (int i = 0; i < array.length; i++) { |
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109 testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET); |
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110 } |
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111 } |
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112 } |
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113 |
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114 @Test |
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115 public void testArrayOffHeap() { |
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116 int size = 10; |
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117 long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT); |
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118 try { |
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119 for (int c = 0; c < ITERS; c++) { |
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120 for (int i = 0; i < size; i++) { |
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121 testAccess(null, (((long) i) << ARRAY_SHIFT) + address); |
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122 } |
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123 } |
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124 } finally { |
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125 UNSAFE.freeMemory(address); |
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126 } |
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127 } |
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128 |
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129 @Test |
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130 public void testArrayOffHeapDirect() { |
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131 int size = 10; |
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132 long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT); |
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133 try { |
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134 for (int c = 0; c < ITERS; c++) { |
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135 for (int i = 0; i < size; i++) { |
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136 testAccess((((long) i) << ARRAY_SHIFT) + address); |
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137 } |
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138 } |
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139 } finally { |
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140 UNSAFE.freeMemory(address); |
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141 } |
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142 } |
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143 |
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144 static void testAccess(Object base, long offset) { |
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145 // Plain |
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146 { |
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147 UNSAFE.putByte(base, offset, (byte)1); |
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148 byte x = UNSAFE.getByte(base, offset); |
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149 assertEquals(x, (byte)1, "set byte value"); |
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150 } |
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151 |
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152 // Volatile |
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153 { |
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154 UNSAFE.putByteVolatile(base, offset, (byte)2); |
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155 byte x = UNSAFE.getByteVolatile(base, offset); |
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156 assertEquals(x, (byte)2, "putVolatile byte value"); |
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157 } |
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158 |
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159 |
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160 |
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161 |
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162 } |
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163 |
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164 static void testAccess(long address) { |
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165 // Plain |
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166 { |
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167 UNSAFE.putByte(address, (byte)1); |
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168 byte x = UNSAFE.getByte(address); |
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169 assertEquals(x, (byte)1, "set byte value"); |
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170 } |
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171 } |
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172 } |