Mercurial > hg > Members > kono > jpf-core
annotate src/main/gov/nasa/jpf/jvm/bytecode/LDC.java @ 0:61d41facf527
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author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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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.jvm.bytecode; |
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19 |
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20 import gov.nasa.jpf.vm.Instruction; |
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21 import gov.nasa.jpf.vm.ClassInfo; |
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22 import gov.nasa.jpf.vm.ElementInfo; |
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23 import gov.nasa.jpf.vm.LoadOnJPFRequired; |
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24 import gov.nasa.jpf.vm.StackFrame; |
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25 import gov.nasa.jpf.vm.ThreadInfo; |
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26 import gov.nasa.jpf.vm.Types; |
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27 |
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28 |
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29 /** |
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30 * Push item from runtime constant pool |
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31 * ... => ..., value |
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32 */ |
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33 public class LDC extends Instruction implements JVMInstruction { |
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34 |
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35 public enum Type {STRING, CLASS, INT, FLOAT}; |
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36 |
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37 Type type; |
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38 |
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39 protected String string; // the string value if Type.STRING, classname if Type.CLASS |
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40 protected int value; |
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41 |
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42 public LDC() {} |
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43 |
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44 public LDC (String s, boolean isClass){ |
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45 if (isClass){ |
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46 string = Types.getClassNameFromTypeName(s); |
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47 type = Type.CLASS; |
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48 } else { |
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49 string = s; |
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50 type = Type.STRING; |
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51 } |
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52 } |
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53 |
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54 public LDC (int v){ |
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55 value = v; |
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56 type = Type.INT; |
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57 } |
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58 |
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59 public LDC (float f){ |
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60 value = Float.floatToIntBits(f); |
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61 type = Type.FLOAT; |
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62 } |
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63 |
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64 |
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65 @Override |
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66 public Instruction execute (ThreadInfo ti) { |
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67 StackFrame frame = ti.getModifiableTopFrame(); |
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68 |
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69 switch (type){ |
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70 case STRING: |
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71 // too bad we can't cache it, since location might change between different paths |
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72 ElementInfo eiValue = ti.getHeap().newInternString(string, ti); |
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73 value = eiValue.getObjectRef(); |
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74 frame.pushRef(value); |
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75 break; |
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76 |
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77 case INT: |
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78 case FLOAT: |
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79 frame.push(value); |
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80 break; |
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81 |
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82 case CLASS: |
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83 ClassInfo ci; |
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84 // resolve the referenced class |
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85 try { |
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86 ci = ti.resolveReferencedClass(string); |
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87 } catch(LoadOnJPFRequired lre) { |
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88 return frame.getPC(); |
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89 } |
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90 |
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91 // LDC doesn't cause a <clinit> - we only register all required classes |
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92 // to make sure we have class objects. <clinit>s are called prior to |
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93 // GET/PUT or INVOKE |
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94 if (!ci.isRegistered()) { |
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95 ci.registerClass(ti); |
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96 } |
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97 |
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98 frame.pushRef( ci.getClassObjectRef()); |
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99 |
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100 break; |
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101 } |
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102 |
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103 return getNext(ti); |
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104 } |
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105 |
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106 @Override |
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107 public int getLength() { |
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108 return 2; // opcode, index |
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109 } |
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110 |
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111 @Override |
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112 public int getByteCode () { |
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113 return 0x12; |
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114 } |
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115 |
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116 public int getValue() { |
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117 return value; |
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118 } |
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119 |
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120 public Type getType() { |
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121 return type; |
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122 } |
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123 |
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124 public boolean isString() { |
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125 return (type == Type.STRING); |
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126 } |
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127 |
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128 public float getFloatValue(){ |
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129 if(type!=Type.FLOAT){ |
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130 throw new IllegalStateException(); |
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131 } |
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132 |
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133 return Float.intBitsToFloat(value); |
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134 } |
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135 |
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136 public String getStringValue() { // if it is a String (not acquired from the class const pool) |
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137 if (type == Type.STRING) { |
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138 return string; |
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139 } else { |
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140 return null; |
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141 } |
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142 } |
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143 |
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144 public String getClassValue() { // if it is the name of a Class (acquired from the class const pool) |
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145 if (type == Type.CLASS) { |
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146 return string; |
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147 } else { |
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148 return null; |
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149 } |
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150 } |
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151 |
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152 |
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153 @Override |
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154 public void accept(JVMInstructionVisitor insVisitor) { |
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155 insVisitor.visit(this); |
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156 } |
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157 } |