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annotate src/main/gov/nasa/jpf/jvm/bytecode/PUTFIELD.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.util.InstructionState;
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21 import gov.nasa.jpf.vm.ElementInfo;
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22 import gov.nasa.jpf.vm.FieldInfo;
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23 import gov.nasa.jpf.vm.Instruction;
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24 import gov.nasa.jpf.vm.MJIEnv;
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25 import gov.nasa.jpf.vm.Scheduler;
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26 import gov.nasa.jpf.vm.StackFrame;
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27 import gov.nasa.jpf.vm.ThreadInfo;
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28 import gov.nasa.jpf.vm.bytecode.WriteInstruction;
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29
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30 /**
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31 * Set field in object
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32 * ..., objectref, value => ...
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33 */
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34 public class PUTFIELD extends JVMInstanceFieldInstruction implements WriteInstruction {
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35
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36 public PUTFIELD(String fieldName, String clsDescriptor, String fieldDescriptor){
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37 super(fieldName, clsDescriptor, fieldDescriptor);
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38 }
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39
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40 @Override
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41 public int getObjectSlot (StackFrame frame){
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42 return frame.getTopPos() - size;
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43 }
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44
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45 /**
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46 * where do we get the value from?
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47 * NOTE: only makes sense in a executeInstruction() context
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48 */
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49 @Override
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50 public int getValueSlot (StackFrame frame){
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51 return frame.getTopPos();
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52 }
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53
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54
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55 /**
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56 * where do we write to?
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57 * NOTE: this should only be used from a executeInstruction()/instructionExecuted() context
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58 */
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59 @Override
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60 public ElementInfo getElementInfo(ThreadInfo ti){
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61 if (isCompleted(ti)){
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62 return ti.getElementInfo(lastThis);
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63 } else {
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64 return peekElementInfo(ti); // get it from the stack
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65 }
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66 }
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67
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68 @Override
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69 public Instruction execute (ThreadInfo ti) {
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70 StackFrame frame = ti.getModifiableTopFrame();
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71 int objRef = frame.peek( size);
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72 lastThis = objRef;
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73
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74 if (objRef == MJIEnv.NULL) {
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75 return ti.createAndThrowException("java.lang.NullPointerException", "referencing field '" + fname + "' on null object");
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76 }
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77
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78 ElementInfo eiFieldOwner = ti.getModifiableElementInfo(objRef);
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79 FieldInfo fieldInfo = getFieldInfo();
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80 if (fieldInfo == null) {
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81 return ti.createAndThrowException("java.lang.NoSuchFieldError", "no field " + fname + " in " + eiFieldOwner);
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82 }
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83
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84 //--- check scheduling point due to shared object access
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85 Scheduler scheduler = ti.getScheduler();
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86 if (scheduler.canHaveSharedObjectCG(ti,this,eiFieldOwner,fieldInfo)){
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87 eiFieldOwner = scheduler.updateObjectSharedness( ti, eiFieldOwner, fi);
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88 if (scheduler.setsSharedObjectCG( ti, this, eiFieldOwner, fieldInfo)){
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89 return this; // re-execute
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90 }
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91 }
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92
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93 // this might be re-executed
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94 if (frame.getAndResetFrameAttr(InstructionState.class) == null){
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95 lastValue = PutHelper.setField(ti, frame, eiFieldOwner, fieldInfo);
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96 }
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97
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98 //--- check scheduling point due to exposure through shared object
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99 if (isReferenceField()){
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100 int refValue = frame.peek();
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101 if (refValue != MJIEnv.NULL){
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102 ElementInfo eiExposed = ti.getElementInfo(refValue);
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103 if (scheduler.setsSharedObjectExposureCG(ti, this, eiFieldOwner, fi, eiExposed)){
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104 frame.addFrameAttr( InstructionState.processed);
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105 return this; // re-execute AFTER assignment
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106 }
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107 }
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108 }
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109
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110 popOperands(frame);
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111 return getNext();
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112 }
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113
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114 protected void popOperands (StackFrame frame){
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115 if (size == 1){
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116 frame.pop(2); // .. objref, val => ..
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117 } else {
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118 frame.pop(3); // .. objref, highVal,lowVal => ..
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119 }
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120 }
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121
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122 @Override
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123 public ElementInfo peekElementInfo (ThreadInfo ti) {
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124 FieldInfo fi = getFieldInfo();
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125 int storageSize = fi.getStorageSize();
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126 int objRef = ti.getTopFrame().peek( (storageSize == 1) ? 1 : 2);
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127 ElementInfo ei = ti.getElementInfo( objRef);
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128
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129 return ei;
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130 }
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131
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132
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133 @Override
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134 public int getLength() {
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135 return 3; // opcode, index1, index2
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136 }
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137
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138 @Override
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139 public int getByteCode () {
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140 return 0xB5;
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141 }
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142
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143 @Override
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144 public boolean isRead() {
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145 return false;
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146 }
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147
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148 @Override
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149 public void accept(JVMInstructionVisitor insVisitor) {
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150 insVisitor.visit(this);
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151 }
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152 }
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153
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154
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155