Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/DynamicElementInfo.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 import gov.nasa.jpf.JPFException;
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21
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22 /**
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23 * A specialized version of ElementInfo that represents heap objects
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24 */
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25 public class DynamicElementInfo extends ElementInfo {
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26
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27 public DynamicElementInfo () {
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28 // for restoration
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29 }
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30
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31 public DynamicElementInfo (int objref, ClassInfo ci, Fields f, Monitor m, ThreadInfo ti) {
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32 super(objref, ci, f, m, ti);
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33
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34 attributes = ci.getElementInfoAttrs();
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35
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36 ti.getScheduler().initializeObjectSharedness(ti, this);
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37 }
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38
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39 @Override
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40 public ElementInfo getModifiableInstance() {
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41 if (!isFrozen()) {
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42 return this;
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43 } else {
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44 return VM.getVM().getHeap().getModifiable( objRef);
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45 }
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46 }
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47
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48 @Override
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49 public boolean isObject(){
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50 return true;
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51 }
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52
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53 @Override
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54 public boolean hasFinalizer() {
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55 return (ci.getFinalizer()!=null);
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56 }
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57
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58 @Override
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59 protected int getNumberOfFieldsOrElements(){
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60 if (fields instanceof ArrayFields){
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61 return ((ArrayFields)fields).arrayLength();
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62 } else {
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63 return ci.getNumberOfInstanceFields();
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64 }
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65 }
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66
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67 @Override
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68 public int getNumberOfFields () {
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69 return getClassInfo().getNumberOfInstanceFields();
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70 }
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71
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72 @Override
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73 public FieldInfo getFieldInfo (int fieldIndex) {
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74 return getClassInfo().getInstanceField(fieldIndex);
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75 }
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76
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77 @Override
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78 public FieldInfo getFieldInfo (String fname) {
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79 return getClassInfo().getInstanceField(fname);
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80 }
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81 @Override
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82 protected FieldInfo getDeclaredFieldInfo (String clsBase, String fname) {
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83 return getClassInfo().getClassLoaderInfo().getResolvedClassInfo(clsBase).getDeclaredInstanceField(fname);
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84 }
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85
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86 @Override
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87 public ElementInfo getEnclosingElementInfo(){
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88 for (FieldInfo fi : getClassInfo().getDeclaredInstanceFields()){
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89 if (fi.getName().startsWith("this$")){
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90 int objref = getReferenceField(fi);
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91 return VM.getVM().getElementInfo(objref);
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92 }
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93 }
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94 return null;
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95 }
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96
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97 @Override
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98 public String asString() {
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99 char[] data = getStringChars();
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100 if (data != null){
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101 return new String(data);
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102
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103 } else {
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104 return "";
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105 }
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106 }
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107
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108 @Override
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109 public char[] getStringChars(){
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110 if (!ClassInfo.isStringClassInfo(ci)) {
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111 throw new JPFException("object is not of type java.lang.String");
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112 }
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113
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114 int vref = getDeclaredReferenceField("value", "java.lang.String");
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115 if (vref != MJIEnv.NULL){
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116 ElementInfo eVal = VM.getVM().getHeap().get(vref);
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117 char[] value = eVal.asCharArray();
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118 return value;
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119
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120 } else {
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121 return null;
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122 }
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123 }
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124
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125 /**
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126 * just a helper to avoid creating objects just for the sake of comparing
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127 */
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128 @Override
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129 public boolean equalsString (String s) {
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130 if (!ClassInfo.isStringClassInfo(ci)) {
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131 return false;
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132 }
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133
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134 int vref = getDeclaredReferenceField("value", "java.lang.String");
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135 ElementInfo e = VM.getVM().getHeap().get(vref);
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136 CharArrayFields cf = (CharArrayFields)e.getFields();
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137 char[] v = cf.asCharArray();
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138
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139 return new String(v).equals(s);
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140 }
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141
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142 @Override
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143 public boolean isBoxObject(){
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144 String cname = ci.getName();
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145 if (cname.startsWith("java.lang.")){
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146 cname = cname.substring(10);
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147 return ("Boolean".equals(cname) ||
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148 "Character".equals(cname) ||
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149 "Byte".equals(cname) ||
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150 "Short".equals(cname) ||
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151 "Integer".equals(cname) ||
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152 "Float".equals(cname) ||
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153 "Long".equals(cname) ||
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154 "Double".equals(cname) );
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155
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156 } else {
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157 return false;
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158 }
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159 }
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160
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161 @Override
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162 public Object asBoxObject(){
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163 String cname = ci.getName();
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164 if (cname.startsWith("java.lang.")){
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165 cname = cname.substring(10);
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166 if ("Boolean".equals(cname)){
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167 return Boolean.valueOf( getBooleanField("value"));
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168 } else if ("Character".equals(cname)){
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169 return Character.valueOf(getCharField("value"));
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170 } else if ("Byte".equals(cname)){
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171 return Byte.valueOf( getByteField("value"));
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172 } else if ("Short".equals(cname)){
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173 return Short.valueOf( getShortField("value"));
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174 } else if ("Integer".equals(cname)){
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175 return Integer.valueOf( getIntField("value"));
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176 } else if ("Float".equals(cname)){
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177 return Float.valueOf( getFloatField("value"));
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178 } else if ("Long".equals(cname)){
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179 return Long.valueOf( getLongField("value"));
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180 } else if ("Double".equals(cname)){
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181 return Double.valueOf( getDoubleField("value"));
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182 }
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183 }
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184
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185 throw new JPFException("object is not a box object: " + this);
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186 }
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187 }