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annotate src/main/gov/nasa/jpf/jvm/bytecode/PUTSTATIC.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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children db918c531e6d
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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.ClassInfo;
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22 import gov.nasa.jpf.vm.ElementInfo;
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23 import gov.nasa.jpf.vm.FieldInfo;
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24 import gov.nasa.jpf.vm.Instruction;
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25 import gov.nasa.jpf.vm.LoadOnJPFRequired;
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26 import gov.nasa.jpf.vm.MJIEnv;
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27 import gov.nasa.jpf.vm.Scheduler;
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28 import gov.nasa.jpf.vm.StackFrame;
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29 import gov.nasa.jpf.vm.ThreadInfo;
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30 import gov.nasa.jpf.vm.bytecode.WriteInstruction;
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31
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32
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33 /**
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34 * Set static field in class
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35 * ..., value => ...
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36 */
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37 public class PUTSTATIC extends JVMStaticFieldInstruction implements WriteInstruction {
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38
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39 public PUTSTATIC(String fieldName, String clsDescriptor, String fieldDescriptor){
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40 super(fieldName, clsDescriptor, fieldDescriptor);
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41 }
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42
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43 /**
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44 * where do we get the value from?
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45 * NOTE: only makes sense in a executeInstruction() context
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46 */
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47 @Override
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48 public int getValueSlot (StackFrame frame){
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49 return frame.getTopPos();
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50 }
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51
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52 @Override
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53 public Instruction execute (ThreadInfo ti) {
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54 StackFrame frame = ti.getModifiableTopFrame();
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55 FieldInfo fieldInfo;
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56
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57 //--- check if this causes a class load by a user defined classloader
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58 try {
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59 fieldInfo = getFieldInfo();
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60 } catch (LoadOnJPFRequired lre) {
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61 return ti.getPC();
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62 }
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63
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64 if (fieldInfo == null) {
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65 return ti.createAndThrowException("java.lang.NoSuchFieldError", (className + '.' + fname));
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66 }
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67
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68 //--- check if this has to trigger class initialization
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69 ClassInfo ciField = fieldInfo.getClassInfo();
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70 if (!mi.isClinit(ciField) && ciField.pushRequiredClinits(ti)) {
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71 return ti.getPC(); // this returns the next insn in the topmost clinit that just got pushed
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72 }
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73 ElementInfo eiFieldOwner = ciField.getModifiableStaticElementInfo();
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74
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75 //--- check scheduling point due to shared class access
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76 Scheduler scheduler = ti.getScheduler();
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77 if (scheduler.canHaveSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
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78 eiFieldOwner = scheduler.updateClassSharedness(ti, eiFieldOwner, fi);
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79 if (scheduler.setsSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
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80 return this; // re-execute
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81 }
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82 }
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83
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84 // check if this gets re-executed from a exposure CG (which already did the assignment
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85 if (frame.getAndResetFrameAttr(InstructionState.class) == null){
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86 lastValue = PutHelper.setField(ti, frame, eiFieldOwner, fieldInfo);
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87 }
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88
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89 //--- check scheduling point due to exposure through shared class
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90 if (isReferenceField()){
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91 int refValue = frame.peek();
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92 if (refValue != MJIEnv.NULL){
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93 ElementInfo eiExposed = ti.getElementInfo(refValue);
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94 if (scheduler.setsSharedClassExposureCG(ti,this,eiFieldOwner,fieldInfo,eiExposed)){
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95 frame.addFrameAttr( InstructionState.processed);
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96 return this; // re-execute AFTER assignment
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97 }
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98 }
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99 }
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100
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101 popOperands(frame);
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102 return getNext();
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103 }
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104
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105 protected void popOperands (StackFrame frame){
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106 if (size == 1){
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107 frame.pop(); // .. val => ..
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108 } else {
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109 frame.pop(2); // .. highVal, lowVal => ..
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110 }
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111 }
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112
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113 @Override
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114 public int getLength() {
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115 return 3; // opcode, index1, index2
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116 }
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117
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118 @Override
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119 public int getByteCode () {
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120 return 0xB3;
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121 }
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122
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123 @Override
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124 public boolean isRead() {
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125 return false;
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126 }
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127
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128 @Override
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129 public void accept(JVMInstructionVisitor insVisitor) {
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130 insVisitor.visit(this);
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131 }
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132 }