Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/jvm/bytecode/ARRAYLENGTH.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.Instruction;
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22 import gov.nasa.jpf.vm.MJIEnv;
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23 import gov.nasa.jpf.vm.StackFrame;
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24 import gov.nasa.jpf.vm.ThreadInfo;
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25
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26
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27 /**
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28 * Get length of array
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29 * ..., arrayref => ..., length
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30 */
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31 public class ARRAYLENGTH extends Instruction implements JVMInstruction {
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32
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33 protected int arrayRef;
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34
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35 /**
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36 * only makes sense from an executeInstruction() or instructionExecuted() listener,
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37 * it is undefined outside of insn exec notifications
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38 */
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39 public int getArrayRef (ThreadInfo ti){
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40 if (ti.isPreExec()){
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41 return peekArrayRef(ti);
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42 } else {
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43 return arrayRef;
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44 }
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45 }
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46
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47 public ElementInfo peekArrayElementInfo (ThreadInfo ti){
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48 int aref = getArrayRef(ti);
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49 return ti.getElementInfo(aref);
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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
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56 arrayRef = frame.pop();
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57
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58 if (arrayRef == MJIEnv.NULL){
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59 return ti.createAndThrowException("java.lang.NullPointerException",
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60 "array length of null object");
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61 }
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62
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63 ElementInfo ei = ti.getElementInfo(arrayRef);
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64 frame.push(ei.arrayLength(), false);
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65
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66 return getNext(ti);
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67 }
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68
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69 @Override
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70 public int getByteCode () {
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71 return 0xBE;
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72 }
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73
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74 @Override
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75 public void accept(JVMInstructionVisitor insVisitor) {
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76 insVisitor.visit(this);
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77 }
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78
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79 protected int peekArrayRef (ThreadInfo ti) {
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80 return ti.getTopFrame().peek();
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81 }
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82 }