Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/bytecode/InstanceFieldInstruction.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
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19 package gov.nasa.jpf.vm.bytecode;
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20
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21 import gov.nasa.jpf.vm.ClassInfo;
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22 import gov.nasa.jpf.vm.ClassLoaderInfo;
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23 import gov.nasa.jpf.vm.ElementInfo;
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24 import gov.nasa.jpf.vm.FieldInfo;
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25 import gov.nasa.jpf.vm.MJIEnv;
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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.VM;
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29
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30 /**
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31 * common machine independent type for all instance field access instructions
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32 */
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33 public abstract class InstanceFieldInstruction extends FieldInstruction {
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34
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35 protected int lastThis = MJIEnv.NULL;
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36
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37 protected InstanceFieldInstruction (String fieldName, String classType, String fieldDescriptor){
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38 super(fieldName, classType, fieldDescriptor);
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39 }
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40
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41 public abstract int getObjectSlot (StackFrame frame);
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42
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43 @Override
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44 public ElementInfo getElementInfo (ThreadInfo ti){
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45 if (isCompleted(ti)){
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46 return ti.getElementInfo(lastThis);
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47 } else {
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48 return peekElementInfo(ti);
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49 }
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50 }
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51
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52 @Override
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53 public String toPostExecString(){
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54 StringBuilder sb = new StringBuilder();
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55 sb.append(getMnemonic());
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56 sb.append(' ');
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57 sb.append( getLastElementInfo());
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58 sb.append('.');
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59 sb.append(fname);
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60
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61 return sb.toString();
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62 }
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63
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64 @Override
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65 public FieldInfo getFieldInfo () {
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66 if (fi == null) {
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67 ClassInfo ci = ClassLoaderInfo.getCurrentResolvedClassInfo(className);
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68 if (ci != null) {
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69 fi = ci.getInstanceField(fname);
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70 }
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71 }
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72 return fi;
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73 }
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74
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75 /**
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76 * NOTE - the return value is *only* valid in a instructionExecuted() context, since
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77 * the same instruction can be executed from different threads
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78 */
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79 public int getLastThis() {
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80 return lastThis;
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81 }
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82
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83 /**
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84 * since this is based on getLastThis(), the same context restrictions apply
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85 */
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86 @Override
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87 public ElementInfo getLastElementInfo () {
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88 if (lastThis != MJIEnv.NULL) {
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89 return VM.getVM().getHeap().get(lastThis); // <2do> remove - should be in clients
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90 }
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91
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92 return null;
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93 }
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94
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95 public String getFieldDescriptor () {
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96 ElementInfo ei = getLastElementInfo();
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97 FieldInfo fi = getFieldInfo();
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98
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99 return ei.toString() + '.' + fi.getName();
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100 }
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101
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102 }