Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/jvm/bytecode/INVOKEDYNAMIC.java @ 29:820b89dd6c97

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Fixed a bug in the implementation for lambda support. Now, every invocation of invokedynamic that is associated with a lamabda expression including free variables leads to a new instance of a function object.
author nastaran <nastaran.shafiei@gmail.com>
date Fri, 16 Oct 2015 15:55:08 -0700
parents 7be90179bb3b
children
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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.BootstrapMethodInfo;
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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.FunctionObjectFactory;
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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.StackFrame;
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28 import gov.nasa.jpf.vm.ThreadInfo;
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29 import gov.nasa.jpf.vm.Types;
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30 import gov.nasa.jpf.vm.VM;
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31
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32 /**
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33 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
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34 *
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35 * Invoke dynamic method. It allows dynamic linkage between a call site and a method implementation.
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36 *
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37 * ..., [arg1, [arg2 ...]] => ...
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38 */
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39 public class INVOKEDYNAMIC extends Instruction {
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40
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41 // index of a bootstrap method (index to the array bootstrapMethods[] declared in ClassInfo
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42 // containing this bytecode instruction)
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43 int bootstrapMethodIndex;
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44
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45 // Free variables are those that are not defined within the lamabda body and
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46 // are captured from the lexical scope. Note that for instance lambda methods
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47 // the first captured variable always represents "this"
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48 String[] freeVariableTypeNames;
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49 byte[] freeVariableTypes;
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50
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51 String functionalInterfaceName;
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52
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53 String samMethodName;
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54
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55 int funcObjRef = MJIEnv.NULL;
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56
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57 ElementInfo lastFuncObj = null;
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58
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59 public INVOKEDYNAMIC () {}
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60
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61 protected INVOKEDYNAMIC (int bmIndex, String methodName, String descriptor){
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62 bootstrapMethodIndex = bmIndex;
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63 samMethodName = methodName;
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64 freeVariableTypeNames = Types.getArgumentTypeNames(descriptor);
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65 freeVariableTypes = Types.getArgumentTypes(descriptor);
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66 functionalInterfaceName = Types.getReturnTypeSignature(descriptor);
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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 0xBA;
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72 }
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73
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74 @Override
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75 public String toString() {
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76 String args = "";
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77 for(String type: freeVariableTypeNames) {
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78 if(args.length()>0) {
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79 type += ','+ type;
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80 }
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81 args += type;
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82 }
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83 return "invokedynamic " + bootstrapMethodIndex + " " +
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84 samMethodName + '(' + args +"):" + functionalInterfaceName;
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85 }
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86
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87 /**
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88 * For now, INVOKEDYNAMIC works only in the context of lambda expressions.
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89 * Executing this returns an object that implements the functional interface
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90 * and contains a method which captures the behavior of the lambda expression.
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91 */
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92 @Override
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93 public Instruction execute (ThreadInfo ti) {
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94 StackFrame frame = ti.getModifiableTopFrame();
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95
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96 ElementInfo ei = ti.getHeap().get(funcObjRef);
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97
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820b89dd6c97 Fixed a bug in the implementation for lambda support. Now, every invocation of invokedynamic that is associated with a lamabda expression including free variables leads to a new instance of a function object.
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98 if(ei==null || ei!=lastFuncObj || freeVariableTypes.length>0) {
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99 ClassInfo fiClassInfo;
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100
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101 // First, resolve the functional interface
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102 try {
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103 fiClassInfo = ti.resolveReferencedClass(functionalInterfaceName);
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104 } catch(LoadOnJPFRequired lre) {
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105 return ti.getPC();
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106 }
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107
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108 if (fiClassInfo.initializeClass(ti)) {
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109 return ti.getPC();
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110 }
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111
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112 ClassInfo enclosingClass = this.getMethodInfo().getClassInfo();
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113
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114 BootstrapMethodInfo bmi = enclosingClass.getBootstrapMethodInfo(bootstrapMethodIndex);
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115
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116 VM vm = VM.getVM();
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117 FunctionObjectFactory funcObjFactory = vm.getFunctionObjectFacotry();
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118
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119 Object[] freeVariableValues = frame.getArgumentsValues(ti, freeVariableTypes);
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120
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7be90179bb3b Provided support for double colon operator used for lamabda expressions. Fixed a bug related to generating names for funcation object classes (by supporting double colon operator, a new stragety needed to generate unique names for function objects. To achive that the bootstrap ids are incorporated into names). Finally modified the method that retrieves the SAM from functional interfaces.
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121 funcObjRef = funcObjFactory.getFunctionObject(bootstrapMethodIndex, ti, fiClassInfo, samMethodName, bmi, freeVariableTypeNames, freeVariableValues);
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122 lastFuncObj = ti.getHeap().get(funcObjRef);
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123 }
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124
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125 frame.pop(freeVariableTypes.length);
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126 frame.pushRef(funcObjRef);
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127
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128 return getNext(ti);
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129 }
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130 }