Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/BoxObjectCacheManager.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18 package gov.nasa.jpf.vm;
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19
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20 /**
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21 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
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22 *
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23 * Cache management implementation for the types Boolean, Byte,
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24 * Character, Short, Integer, Long. The references to the caches are in
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25 * the class classes/gov/nasa/jpf/BoxObjectCaches.
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26 *
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27 * All the caches, except Boolean, are initialized on the first
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28 * invocation of valueOf(), and they all exempt from garbage collection.
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29 *
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30 * NOTE: All classes obtained from getResolvedClassInfo in
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31 * BoxObjectCacheManager are safe, and there is no need to check if they
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32 * are initialized. The wrappers and BoxObjectCaches are initialized in
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33 * VM.intialize(), and there are no clinit for array classes.
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34 *
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35 * NOTE: the initXCache allocations are system allocations, whereas the
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36 * valueOfX() allocations are rooted in SUT code
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37 */
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38 public class BoxObjectCacheManager {
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39 private static final String MODEL_CLASS = "gov.nasa.jpf.BoxObjectCaches";
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40 private static final int ANCHOR = BoxObjectCacheManager.class.getName().hashCode();
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41
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42 // cache default bounds
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43 private static int defLow = -128;
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44 private static int defHigh = 127;
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45
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46 public static int valueOfBoolean (ThreadInfo ti, boolean b) {
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47 ClassInfo cls = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Boolean");
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48
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49 int boolObj;
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50 if (b) {
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51 boolObj = cls.getStaticElementInfo().getReferenceField("TRUE");
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52 } else {
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53 boolObj = cls.getStaticElementInfo().getReferenceField("FALSE");
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54 }
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55
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56 return boolObj;
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57 }
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58
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59 // Byte cache bounds
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60 private static byte byteLow;
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61 private static byte byteHigh;
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62
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63 public static int initByteCache (ThreadInfo ti) {
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64 byteLow = (byte) ti.getVM().getConfig().getInt("vm.cache.low_byte", defLow);
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65 byteHigh = (byte) ti.getVM().getConfig().getInt("vm.cache.high_byte", defHigh);
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66 int n = (byteHigh - byteLow) + 1;
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67
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68 Heap heap = ti.getHeap();
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69 ElementInfo eiArray = heap.newSystemArray("Ljava/lang/Byte", n, ti, ANCHOR);
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70 int arrayRef = eiArray.getObjectRef();
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71
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72 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Byte");
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73 byte val = byteLow;
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74 for (int i = 0; i < n; i++) {
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75 ElementInfo eiByte = heap.newSystemObject(ci, ti, ANCHOR);
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76 eiByte.setByteField("value", val++);
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77 eiArray.setReferenceElement(i, eiByte.getObjectRef());
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78 }
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79
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80 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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81 cacheClass.getModifiableStaticElementInfo().setReferenceField("byteCache", arrayRef);
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82 return arrayRef;
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83 }
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84
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85 public static int valueOfByte (ThreadInfo ti, byte b) {
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86 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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87 int byteCache = cacheClass.getStaticElementInfo().getReferenceField("byteCache");
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88
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89 if (byteCache == MJIEnv.NULL) { // initializing the cache on demand
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90 byteCache = initByteCache(ti);
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91 }
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92
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93 if (b >= byteLow && b <= byteHigh) { return ti.getElementInfo(byteCache).getReferenceElement(b - byteLow); }
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94
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95 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Byte");
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96 ElementInfo eiByte = ti.getHeap().newObject(ci, ti);
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97 eiByte.setByteField("value", b);
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98 return eiByte.getObjectRef();
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99 }
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100
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101 // Character cache bound
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102 private static int charHigh;
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103
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104 public static int initCharCache (ThreadInfo ti) {
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105 charHigh = ti.getVM().getConfig().getInt("vm.cache.high_char", defHigh);
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106 int n = charHigh + 1;
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107
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108 Heap heap = ti.getHeap();
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109 ElementInfo eiArray = heap.newSystemArray("Ljava/lang/Character", n, ti, ANCHOR);
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110 int arrayRef = eiArray.getObjectRef();
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111
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112 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Character");
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113 for (int i = 0; i < n; i++) {
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114 ElementInfo eiChar = heap.newSystemObject(ci, ti, ANCHOR);
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115 eiChar.setCharField("value", (char) i);
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116 eiArray.setReferenceElement(i, eiChar.getObjectRef());
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117 }
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118
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119 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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120 cacheClass.getModifiableStaticElementInfo().setReferenceField("charCache", arrayRef);
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121 return arrayRef;
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122 }
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123
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124 public static int valueOfCharacter (ThreadInfo ti, char c) {
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125 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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126 int charCache = cacheClass.getStaticElementInfo().getReferenceField("charCache");
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127
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128 if (charCache == MJIEnv.NULL) { // initializing the cache on demand
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129 charCache = initCharCache(ti);
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130 }
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131
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132 if (c >= 0 && c <= charHigh) { return ti.getElementInfo(charCache).getReferenceElement(c); }
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133
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134 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Character");
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135 ElementInfo eiChar = ti.getHeap().newObject(ci, ti);
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136 eiChar.setCharField("value", c);
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137 return eiChar.getObjectRef();
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138 }
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139
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140 // Short cache bounds
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141 private static short shortLow;
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142
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143 private static short shortHigh;
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144
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145 public static int initShortCache (ThreadInfo ti) {
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146 shortLow = (short) ti.getVM().getConfig().getInt("vm.cache.low_short", defLow);
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147 shortHigh = (short) ti.getVM().getConfig().getInt("vm.cache.high_short", defHigh);
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148 int n = (shortHigh - shortLow) + 1;
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149
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150 Heap heap = ti.getHeap();
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151 ElementInfo eiArray = heap.newSystemArray("Ljava/lang/Short", n, ti, ANCHOR);
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152 int arrayRef = eiArray.getObjectRef();
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153
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154 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Short");
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155 short val = shortLow;
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156 for (int i = 0; i < n; i++) {
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157 ElementInfo eiShort = heap.newSystemObject(ci, ti, ANCHOR);
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158 eiShort.setShortField("value", val++);
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159 eiArray.setReferenceElement(i, eiShort.getObjectRef());
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160 }
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161
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162 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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163 cacheClass.getModifiableStaticElementInfo().setReferenceField("shortCache", arrayRef);
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164 return arrayRef;
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165 }
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166
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167 public static int valueOfShort (ThreadInfo ti, short s) {
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168 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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169 int shortCache = cacheClass.getStaticElementInfo().getReferenceField("shortCache");
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170
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171 if (shortCache == MJIEnv.NULL) { // initializing the cache on demand
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172 shortCache = initShortCache(ti);
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173 }
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174
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175 if (s >= shortLow && s <= shortHigh) { return ti.getElementInfo(shortCache).getReferenceElement(s - shortLow); }
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176
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177 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Short");
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178 ElementInfo eiShort = ti.getHeap().newObject(ci, ti);
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179 eiShort.setShortField("value", s);
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180 return eiShort.getObjectRef();
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181 }
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182
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183 // Integer cache bounds
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184 private static int intLow;
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185 private static int intHigh;
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186
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187 public static int initIntCache (ThreadInfo ti) {
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188 intLow = ti.getVM().getConfig().getInt("vm.cache.low_int", defLow);
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189 intHigh = ti.getVM().getConfig().getInt("vm.cache.high_int", defHigh);
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190 int n = (intHigh - intLow) + 1;
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191
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192 Heap heap = ti.getHeap();
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193 ElementInfo eiArray = heap.newSystemArray("Ljava/lang/Integer", n, ti, ANCHOR);
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194 int arrayRef = eiArray.getObjectRef();
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195
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196 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Integer");
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197 for (int i = 0; i < n; i++) {
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198 ElementInfo eiInteger = heap.newSystemObject(ci, ti, ANCHOR);
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199 eiInteger.setIntField("value", i + intLow);
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200 eiArray.setReferenceElement(i, eiInteger.getObjectRef());
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201 }
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202
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203 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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204 cacheClass.getModifiableStaticElementInfo().setReferenceField("intCache", arrayRef);
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205 return arrayRef;
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206 }
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207
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208 public static int valueOfInteger (ThreadInfo ti, int i) {
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209 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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210 int intCache = cacheClass.getStaticElementInfo().getReferenceField("intCache");
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211
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212 if (intCache == MJIEnv.NULL) { // initializing the cache on demand
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213 intCache = initIntCache(ti);
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214 }
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215
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216 if (i >= intLow && i <= intHigh) { return ti.getElementInfo(intCache).getReferenceElement(i - intLow); }
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217
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218 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Integer");
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219 ElementInfo eiInteger = ti.getHeap().newObject(ci, ti);
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220 eiInteger.setIntField("value", i);
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221 return eiInteger.getObjectRef();
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222 }
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223
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224 // Long cache bounds
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225 private static int longLow;
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226 private static int longHigh;
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227
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228 public static int initLongCache (ThreadInfo ti) {
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229 longLow = ti.getVM().getConfig().getInt("vm.cache.low_long", defLow);
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230 longHigh = ti.getVM().getConfig().getInt("vm.cache.high_long", defHigh);
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231 int n = (longHigh - longLow) + 1;
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232
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233 Heap heap = ti.getHeap();
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234 ElementInfo eiArray = heap.newSystemArray("Ljava/lang/Long", n, ti, ANCHOR);
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235 int arrayRef = eiArray.getObjectRef();
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236
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237 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Long");
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238 for (int i = 0; i < n; i++) {
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239 ElementInfo eiLong = heap.newSystemObject(ci, ti, ANCHOR);
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240 eiLong.setLongField("value", i + longLow);
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241 eiArray.setReferenceElement(i, eiLong.getObjectRef());
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242 }
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243
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244 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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245 cacheClass.getModifiableStaticElementInfo().setReferenceField("longCache", arrayRef);
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246 return arrayRef;
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247 }
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248
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249 public static int valueOfLong (ThreadInfo ti, long l) {
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250 ClassInfo cacheClass = ClassLoaderInfo.getSystemResolvedClassInfo(MODEL_CLASS);
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251 int longCache = cacheClass.getStaticElementInfo().getReferenceField("longCache");
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252
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253 if (longCache == MJIEnv.NULL) { // initializing the cache on demand
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254 longCache = initLongCache(ti);
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255 }
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256
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257 if (l >= longLow && l <= longHigh) { return ti.getElementInfo(longCache).getReferenceElement((int) l - longLow); }
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258
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259 ClassInfo ci = ClassLoaderInfo.getSystemResolvedClassInfo("java.lang.Long");
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260 ElementInfo eiLong = ti.getHeap().newObject(ci, ti);
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261 eiLong.setLongField("value", l);
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262 return eiLong.getObjectRef();
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263 }
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264 }