Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/jvm/bytecode/GETFIELD.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.jvm.bytecode;
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19
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20 import gov.nasa.jpf.vm.ElementInfo;
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21 import gov.nasa.jpf.vm.FieldInfo;
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22 import gov.nasa.jpf.vm.Instruction;
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23 import gov.nasa.jpf.vm.MJIEnv;
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24 import gov.nasa.jpf.vm.Scheduler;
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25 import gov.nasa.jpf.vm.StackFrame;
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26 import gov.nasa.jpf.vm.ThreadInfo;
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27 import gov.nasa.jpf.vm.bytecode.ReadInstruction;
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28
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29
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30 /**
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31 * Fetch field from object
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32 * ..., objectref => ..., value
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33 */
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34 public class GETFIELD extends JVMInstanceFieldInstruction implements ReadInstruction {
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35
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36 public GETFIELD (String fieldName, String classType, String fieldDescriptor){
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37 super(fieldName, classType, fieldDescriptor);
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38 }
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39
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40
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41 @Override
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42 public int getObjectSlot (StackFrame frame){
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43 return frame.getTopPos();
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44 }
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45
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46 @Override
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47 public Instruction execute (ThreadInfo ti) {
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48 StackFrame frame = ti.getModifiableTopFrame();
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49 int objRef = frame.peek(); // don't pop yet, we might re-enter
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50 lastThis = objRef;
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51
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52 //--- check for obvious exceptions
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53 if (objRef == MJIEnv.NULL) {
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54 return ti.createAndThrowException("java.lang.NullPointerException",
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55 "referencing field '" + fname + "' on null object");
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56 }
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57
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58 ElementInfo eiFieldOwner = ti.getElementInfo(objRef);
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59 FieldInfo fieldInfo = getFieldInfo();
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60 if (fieldInfo == null) {
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61 return ti.createAndThrowException("java.lang.NoSuchFieldError",
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62 "referencing field '" + fname + "' in " + eiFieldOwner);
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63 }
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64
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65 //--- check for potential transition breaks (be aware everything above gets re-executed)
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66 Scheduler scheduler = ti.getScheduler();
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67 if (scheduler.canHaveSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){
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68 eiFieldOwner = scheduler.updateObjectSharedness( ti, eiFieldOwner, fieldInfo);
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69 if (scheduler.setsSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){
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70 return this; // re-execute
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71 }
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72 }
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73
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74 frame.pop(); // Ok, now we can remove the object ref from the stack
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75 Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo);
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76
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77 // We could encapsulate the push in ElementInfo, but not the GET, so we keep it at the same level
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78 if (fieldInfo.getStorageSize() == 1) { // 1 slotter
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79 int ival = eiFieldOwner.get1SlotField(fieldInfo);
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80 lastValue = ival;
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81
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82 if (fieldInfo.isReference()){
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83 frame.pushRef(ival);
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84
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85 } else {
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86 frame.push(ival);
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87 }
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88
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89 if (fieldAttr != null) {
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90 frame.setOperandAttr(fieldAttr);
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91 }
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92
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93 } else { // 2 slotter
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94 long lval = eiFieldOwner.get2SlotField(fieldInfo);
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95 lastValue = lval;
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96
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97 frame.pushLong( lval);
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98 if (fieldAttr != null) {
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99 frame.setLongOperandAttr(fieldAttr);
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100 }
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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 ElementInfo peekElementInfo (ThreadInfo ti) {
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108 StackFrame frame = ti.getTopFrame();
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109 int objRef = frame.peek();
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110 ElementInfo ei = ti.getElementInfo(objRef);
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111 return ei;
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112 }
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113
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114 @Override
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115 public boolean isMonitorEnterPrologue(){
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116 return GetHelper.isMonitorEnterPrologue(mi, insnIndex);
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117 }
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118
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119 @Override
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120 public int getLength() {
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121 return 3; // opcode, index1, index2
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122 }
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123
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124 @Override
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125 public int getByteCode () {
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126 return 0xB4;
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127 }
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128
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129 @Override
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130 public boolean isRead() {
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131 return true;
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132 }
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133
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134 @Override
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135 public void accept(JVMInstructionVisitor insVisitor) {
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136 insVisitor.visit(this);
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137 }
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138 }