Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/jvm/bytecode/GETSTATIC.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.vm.ClassInfo;
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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.LoadOnJPFRequired;
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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.ReadInstruction;
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29
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30
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31 /**
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32 * Get static fieldInfo from class
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33 * ..., => ..., value
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34 */
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35 public class GETSTATIC extends JVMStaticFieldInstruction implements ReadInstruction {
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36
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37 public GETSTATIC(String fieldName, String clsDescriptor, String fieldDescriptor){
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38 super(fieldName, clsDescriptor, fieldDescriptor);
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39 }
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40
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41 @Override
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42 public Instruction execute (ThreadInfo ti) {
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43 FieldInfo fieldInfo;
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44
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45 //--- check if this causes a class load by a user defined classloader
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46 try {
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47 fieldInfo = getFieldInfo();
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48 } catch (LoadOnJPFRequired lre) {
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49 return ti.getPC();
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50 }
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51
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52 if (fieldInfo == null) {
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53 return ti.createAndThrowException("java.lang.NoSuchFieldError",
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54 (className + '.' + fname));
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55 }
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56
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57 //--- check if this has to trigger class initialization
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58 ClassInfo ciField = fieldInfo.getClassInfo();
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59 if (!mi.isClinit(ciField) && ciField.pushRequiredClinits(ti)) {
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60 // note - this returns the next insn in the topmost clinit that just got pushed
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61 return ti.getPC();
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62 }
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63 ElementInfo eiFieldOwner = ciField.getStaticElementInfo();
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64
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65 //--- check if this breaks the transition
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66 Scheduler scheduler = ti.getScheduler();
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67 if (scheduler.canHaveSharedClassCG( ti, this, eiFieldOwner, fieldInfo)){
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68 eiFieldOwner = scheduler.updateClassSharedness(ti, eiFieldOwner, fieldInfo);
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69 if (scheduler.setsSharedClassCG( 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 Object fieldAttr = eiFieldOwner.getFieldAttr(fieldInfo);
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75 StackFrame frame = ti.getModifiableTopFrame();
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76
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77 if (size == 1) {
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78 int ival = eiFieldOwner.get1SlotField(fieldInfo);
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79 lastValue = ival;
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80
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81 if (fieldInfo.isReference()) {
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82 frame.pushRef(ival);
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83 } else {
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84 frame.push(ival);
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85 }
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86
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87 if (fieldAttr != null) {
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88 frame.setOperandAttr(fieldAttr);
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89 }
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90
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91 } else {
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92 long lval = eiFieldOwner.get2SlotField(fieldInfo);
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93 lastValue = lval;
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94
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95 frame.pushLong(lval);
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96
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97 if (fieldAttr != null) {
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98 frame.setLongOperandAttr(fieldAttr);
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99 }
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100 }
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101
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102 return getNext(ti);
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103 }
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104
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105 @Override
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106 public boolean isMonitorEnterPrologue(){
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107 return GetHelper.isMonitorEnterPrologue(mi, insnIndex);
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108 }
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109
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110 @Override
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111 public int getLength() {
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112 return 3; // opcode, index1, index2
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113 }
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114
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115 @Override
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116 public int getByteCode () {
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117 return 0xB2;
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118 }
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119
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120 @Override
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121 public boolean isRead() {
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122 return true;
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123 }
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124
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125 @Override
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126 public void accept(JVMInstructionVisitor insVisitor) {
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127 insVisitor.visit(this);
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128 }
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129 }