Mercurial > hg > Members > kono > jpf-core
annotate src/main/gov/nasa/jpf/jvm/bytecode/IINC.java @ 0:61d41facf527
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author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
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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.Instruction; |
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21 import gov.nasa.jpf.vm.StackFrame; |
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22 import gov.nasa.jpf.vm.ThreadInfo; |
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23 |
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24 |
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25 /** |
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26 * Increment local variable by constant |
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27 * No change |
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28 */ |
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29 public class IINC extends Instruction implements JVMInstruction { |
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30 |
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31 protected int index; |
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32 protected int increment; |
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33 |
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34 public IINC(int localVarIndex, int increment) { |
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35 this.index = localVarIndex; |
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36 this.increment = increment; |
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37 } |
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38 |
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39 @Override |
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40 public Instruction execute(ThreadInfo ti) { |
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41 StackFrame frame = ti.getModifiableTopFrame(); |
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42 |
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43 int v = frame.getLocalVariable(index); |
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44 v += increment; |
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45 |
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46 frame.setLocalVariable(index, v, false); |
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47 |
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48 return getNext(ti); |
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49 } |
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50 |
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51 @Override |
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52 public int getLength() { |
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53 return 3; // opcode, index, const |
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54 } |
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55 |
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56 @Override |
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57 public int getByteCode() { |
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58 return 0x84; // ?? wide |
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59 } |
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60 |
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61 @Override |
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62 public void accept(JVMInstructionVisitor insVisitor) { |
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63 insVisitor.visit(this); |
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64 } |
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65 |
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66 public int getIndex() { |
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67 return index; |
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68 } |
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69 |
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70 public int getIncrement() { |
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71 return increment; |
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72 } |
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73 |
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74 @Override |
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75 public String toPostExecString() { |
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76 return "iinc " + index + ' ' + increment; |
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77 } |
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78 } |