[a32b204] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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[41a2620] | 7 | // Unify.cc -- |
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[a32b204] | 8 | // |
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| 9 | // Author : Richard C. Bilson |
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| 10 | // Created On : Sun May 17 12:27:10 2015 |
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[4040425] | 11 | // Last Modified By : Peter A. Buhr |
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| 12 | // Last Modified On : Wed Mar 2 17:37:05 2016 |
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| 13 | // Update Count : 37 |
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[a32b204] | 14 | // |
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[51b7345] | 15 | |
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| 16 | #include <set> |
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| 17 | #include <memory> |
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| 18 | |
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| 19 | #include "Unify.h" |
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| 20 | #include "TypeEnvironment.h" |
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| 21 | #include "typeops.h" |
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| 22 | #include "FindOpenVars.h" |
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| 23 | #include "SynTree/Visitor.h" |
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| 24 | #include "SynTree/Type.h" |
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| 25 | #include "SynTree/Declaration.h" |
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| 26 | #include "SymTab/Indexer.h" |
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[d3b7937] | 27 | #include "Common/utility.h" |
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[51b7345] | 28 | |
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| 29 | |
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[1cbca6e] | 30 | // #define DEBUG |
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[51b7345] | 31 | |
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| 32 | namespace ResolvExpr { |
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[a32b204] | 33 | struct WidenMode { |
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| 34 | WidenMode( bool widenFirst, bool widenSecond ): widenFirst( widenFirst ), widenSecond( widenSecond ) {} |
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| 35 | WidenMode &operator|=( const WidenMode &other ) { widenFirst |= other.widenFirst; widenSecond |= other.widenSecond; return *this; } |
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| 36 | WidenMode &operator&=( const WidenMode &other ) { widenFirst &= other.widenFirst; widenSecond &= other.widenSecond; return *this; } |
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| 37 | WidenMode operator|( const WidenMode &other ) { WidenMode newWM( *this ); newWM |= other; return newWM; } |
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| 38 | WidenMode operator&( const WidenMode &other ) { WidenMode newWM( *this ); newWM &= other; return newWM; } |
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| 39 | operator bool() { return widenFirst && widenSecond; } |
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[41a2620] | 40 | |
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[a32b204] | 41 | bool widenFirst : 1, widenSecond : 1; |
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| 42 | }; |
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[51b7345] | 43 | |
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[a32b204] | 44 | class Unify : public Visitor { |
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| 45 | public: |
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| 46 | Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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[41a2620] | 47 | |
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[a32b204] | 48 | bool get_result() const { return result; } |
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| 49 | private: |
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| 50 | virtual void visit(VoidType *voidType); |
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| 51 | virtual void visit(BasicType *basicType); |
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| 52 | virtual void visit(PointerType *pointerType); |
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| 53 | virtual void visit(ArrayType *arrayType); |
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| 54 | virtual void visit(FunctionType *functionType); |
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| 55 | virtual void visit(StructInstType *aggregateUseType); |
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| 56 | virtual void visit(UnionInstType *aggregateUseType); |
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| 57 | virtual void visit(EnumInstType *aggregateUseType); |
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[4040425] | 58 | virtual void visit(TraitInstType *aggregateUseType); |
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[a32b204] | 59 | virtual void visit(TypeInstType *aggregateUseType); |
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| 60 | virtual void visit(TupleType *tupleType); |
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[44b7088] | 61 | virtual void visit(VarArgsType *varArgsType); |
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[89e6ffc] | 62 | virtual void visit(ZeroType *zeroType); |
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| 63 | virtual void visit(OneType *oneType); |
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[a32b204] | 64 | |
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| 65 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
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[02ec390] | 66 | template< typename RefType > void handleGenericRefType( RefType *inst, Type *other ); |
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[a32b204] | 67 | |
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| 68 | bool result; |
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| 69 | Type *type2; // inherited |
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| 70 | TypeEnvironment &env; |
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| 71 | AssertionSet &needAssertions; |
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| 72 | AssertionSet &haveAssertions; |
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| 73 | const OpenVarSet &openVars; |
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| 74 | WidenMode widenMode; |
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| 75 | Type *commonType; |
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| 76 | const SymTab::Indexer &indexer; |
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| 77 | }; |
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| 78 | |
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[eb50842] | 79 | /// Attempts an inexact unification of type1 and type2. |
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| 80 | /// Returns false if no such unification; if the types can be unified, sets common (unless they unify exactly and have identical type qualifiers) |
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[a32b204] | 81 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ); |
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| 82 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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[41a2620] | 83 | |
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[a32b204] | 84 | bool typesCompatible( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 85 | TypeEnvironment newEnv; |
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[1cbca6e] | 86 | OpenVarSet openVars, closedVars; // added closedVars |
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[a32b204] | 87 | AssertionSet needAssertions, haveAssertions; |
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| 88 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 89 | env.apply( newFirst ); |
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| 90 | env.apply( newSecond ); |
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[1cbca6e] | 91 | |
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| 92 | // do we need to do this? Seems like we do, types should be able to be compatible if they |
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| 93 | // have free variables that can unify |
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| 94 | findOpenVars( newFirst, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 95 | findOpenVars( newSecond, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 96 | |
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[a32b204] | 97 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 98 | delete newFirst; |
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| 99 | delete newSecond; |
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| 100 | return result; |
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| 101 | } |
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| 102 | |
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| 103 | bool typesCompatibleIgnoreQualifiers( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) { |
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| 104 | TypeEnvironment newEnv; |
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| 105 | OpenVarSet openVars; |
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| 106 | AssertionSet needAssertions, haveAssertions; |
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| 107 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 108 | env.apply( newFirst ); |
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| 109 | env.apply( newSecond ); |
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| 110 | newFirst->get_qualifiers() = Type::Qualifiers(); |
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| 111 | newSecond->get_qualifiers() = Type::Qualifiers(); |
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[51b7345] | 112 | /// std::cout << "first is "; |
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| 113 | /// first->print( std::cout ); |
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| 114 | /// std::cout << std::endl << "second is "; |
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| 115 | /// second->print( std::cout ); |
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| 116 | /// std::cout << std::endl << "newFirst is "; |
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| 117 | /// newFirst->print( std::cout ); |
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| 118 | /// std::cout << std::endl << "newSecond is "; |
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| 119 | /// newSecond->print( std::cout ); |
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| 120 | /// std::cout << std::endl; |
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[a32b204] | 121 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 122 | delete newFirst; |
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| 123 | delete newSecond; |
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| 124 | return result; |
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| 125 | } |
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| 126 | |
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| 127 | bool isFtype( Type *type, const SymTab::Indexer &indexer ) { |
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| 128 | if ( dynamic_cast< FunctionType* >( type ) ) { |
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| 129 | return true; |
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| 130 | } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) { |
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| 131 | return typeInst->get_isFtype(); |
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| 132 | } // if |
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| 133 | return false; |
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| 134 | } |
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| 135 | |
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| 136 | bool tyVarCompatible( TypeDecl::Kind kind, Type *type, const SymTab::Indexer &indexer ) { |
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| 137 | switch ( kind ) { |
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| 138 | case TypeDecl::Any: |
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| 139 | case TypeDecl::Dtype: |
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| 140 | return ! isFtype( type, indexer ); |
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[41a2620] | 141 | |
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[a32b204] | 142 | case TypeDecl::Ftype: |
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| 143 | return isFtype( type, indexer ); |
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| 144 | } // switch |
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| 145 | assert( false ); |
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| 146 | return false; |
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| 147 | } |
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| 148 | |
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| 149 | bool bindVar( TypeInstType *typeInst, Type *other, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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| 150 | OpenVarSet::const_iterator tyvar = openVars.find( typeInst->get_name() ); |
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| 151 | assert( tyvar != openVars.end() ); |
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| 152 | if ( ! tyVarCompatible( tyvar->second, other, indexer ) ) { |
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| 153 | return false; |
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| 154 | } // if |
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| 155 | if ( occurs( other, typeInst->get_name(), env ) ) { |
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| 156 | return false; |
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| 157 | } // if |
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| 158 | EqvClass curClass; |
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| 159 | if ( env.lookup( typeInst->get_name(), curClass ) ) { |
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| 160 | if ( curClass.type ) { |
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| 161 | Type *common = 0; |
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[eb50842] | 162 | // attempt to unify equivalence class type (which has qualifiers stripped, so they must be restored) with the type to bind to |
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[a32b204] | 163 | std::auto_ptr< Type > newType( curClass.type->clone() ); |
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[721f17a] | 164 | newType->get_qualifiers() = typeInst->get_qualifiers(); |
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[a32b204] | 165 | if ( unifyInexact( newType.get(), other, env, needAssertions, haveAssertions, openVars, widenMode & WidenMode( curClass.allowWidening, true ), indexer, common ) ) { |
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| 166 | if ( common ) { |
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| 167 | common->get_qualifiers() = Type::Qualifiers(); |
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| 168 | delete curClass.type; |
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| 169 | curClass.type = common; |
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| 170 | env.add( curClass ); |
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| 171 | } // if |
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| 172 | return true; |
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| 173 | } else { |
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| 174 | return false; |
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| 175 | } // if |
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| 176 | } else { |
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| 177 | curClass.type = other->clone(); |
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| 178 | curClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 179 | curClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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| 180 | env.add( curClass ); |
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| 181 | } // if |
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| 182 | } else { |
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| 183 | EqvClass newClass; |
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| 184 | newClass.vars.insert( typeInst->get_name() ); |
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| 185 | newClass.type = other->clone(); |
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| 186 | newClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 187 | newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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| 188 | newClass.kind = kind; |
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| 189 | env.add( newClass ); |
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| 190 | } // if |
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| 191 | return true; |
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| 192 | } |
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| 193 | |
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| 194 | bool bindVarToVar( TypeInstType *var1, TypeInstType *var2, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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| 195 | bool result = true; |
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| 196 | EqvClass class1, class2; |
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| 197 | bool hasClass1 = false, hasClass2 = false; |
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| 198 | bool widen1 = false, widen2 = false; |
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| 199 | Type *type1 = 0, *type2 = 0; |
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[41a2620] | 200 | |
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[a32b204] | 201 | if ( env.lookup( var1->get_name(), class1 ) ) { |
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| 202 | hasClass1 = true; |
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| 203 | if ( class1.type ) { |
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| 204 | if ( occurs( class1.type, var2->get_name(), env ) ) { |
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| 205 | return false; |
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| 206 | } // if |
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| 207 | type1 = class1.type->clone(); |
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| 208 | } // if |
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| 209 | widen1 = widenMode.widenFirst && class1.allowWidening; |
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| 210 | } // if |
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| 211 | if ( env.lookup( var2->get_name(), class2 ) ) { |
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| 212 | hasClass2 = true; |
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| 213 | if ( class2.type ) { |
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| 214 | if ( occurs( class2.type, var1->get_name(), env ) ) { |
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| 215 | return false; |
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| 216 | } // if |
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| 217 | type2 = class2.type->clone(); |
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| 218 | } // if |
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| 219 | widen2 = widenMode.widenSecond && class2.allowWidening; |
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| 220 | } // if |
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[41a2620] | 221 | |
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[a32b204] | 222 | if ( type1 && type2 ) { |
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[51b7345] | 223 | // std::cout << "has type1 && type2" << std::endl; |
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[a32b204] | 224 | WidenMode newWidenMode ( widen1, widen2 ); |
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| 225 | Type *common = 0; |
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| 226 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, newWidenMode, indexer, common ) ) { |
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| 227 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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| 228 | class1.allowWidening = widen1 && widen2; |
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| 229 | if ( common ) { |
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| 230 | common->get_qualifiers() = Type::Qualifiers(); |
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| 231 | delete class1.type; |
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| 232 | class1.type = common; |
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| 233 | } // if |
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| 234 | env.add( class1 ); |
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| 235 | } else { |
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| 236 | result = false; |
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| 237 | } // if |
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| 238 | } else if ( hasClass1 && hasClass2 ) { |
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| 239 | if ( type1 ) { |
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| 240 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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| 241 | class1.allowWidening = widen1; |
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| 242 | env.add( class1 ); |
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| 243 | } else { |
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| 244 | class2.vars.insert( class1.vars.begin(), class1.vars.end() ); |
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| 245 | class2.allowWidening = widen2; |
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| 246 | env.add( class2 ); |
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| 247 | } // if |
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| 248 | } else if ( hasClass1 ) { |
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| 249 | class1.vars.insert( var2->get_name() ); |
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| 250 | class1.allowWidening = widen1; |
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| 251 | env.add( class1 ); |
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| 252 | } else if ( hasClass2 ) { |
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| 253 | class2.vars.insert( var1->get_name() ); |
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| 254 | class2.allowWidening = widen2; |
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| 255 | env.add( class2 ); |
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| 256 | } else { |
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| 257 | EqvClass newClass; |
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| 258 | newClass.vars.insert( var1->get_name() ); |
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| 259 | newClass.vars.insert( var2->get_name() ); |
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| 260 | newClass.allowWidening = widen1 && widen2; |
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| 261 | newClass.kind = kind; |
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| 262 | env.add( newClass ); |
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| 263 | } // if |
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| 264 | delete type1; |
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| 265 | delete type2; |
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| 266 | return result; |
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| 267 | } |
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| 268 | |
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| 269 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 270 | OpenVarSet closedVars; |
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| 271 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 272 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 273 | Type *commonType = 0; |
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| 274 | if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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| 275 | if ( commonType ) { |
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| 276 | delete commonType; |
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| 277 | } // if |
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| 278 | return true; |
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| 279 | } else { |
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| 280 | return false; |
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| 281 | } // if |
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| 282 | } |
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| 283 | |
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| 284 | bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) { |
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| 285 | OpenVarSet closedVars; |
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| 286 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 287 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 288 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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| 289 | } |
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| 290 | |
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| 291 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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[51b7345] | 292 | #ifdef DEBUG |
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[a32b204] | 293 | TypeEnvironment debugEnv( env ); |
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[51b7345] | 294 | #endif |
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[eb50842] | 295 | if ( type1->get_qualifiers() != type2->get_qualifiers() ) { |
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| 296 | return false; |
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| 297 | } |
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| 298 | |
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[a32b204] | 299 | bool result; |
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| 300 | TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 ); |
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| 301 | TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 ); |
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| 302 | OpenVarSet::const_iterator entry1, entry2; |
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| 303 | if ( var1 ) { |
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| 304 | entry1 = openVars.find( var1->get_name() ); |
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| 305 | } // if |
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| 306 | if ( var2 ) { |
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| 307 | entry2 = openVars.find( var2->get_name() ); |
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| 308 | } // if |
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| 309 | bool isopen1 = var1 && ( entry1 != openVars.end() ); |
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| 310 | bool isopen2 = var2 && ( entry2 != openVars.end() ); |
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[eb50842] | 311 | |
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| 312 | if ( isopen1 && isopen2 && entry1->second == entry2->second ) { |
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[a32b204] | 313 | result = bindVarToVar( var1, var2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 314 | } else if ( isopen1 ) { |
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| 315 | result = bindVar( var1, type2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 316 | } else if ( isopen2 ) { |
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| 317 | result = bindVar( var2, type1, entry2->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 318 | } else { |
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| 319 | Unify comparator( type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 320 | type1->accept( comparator ); |
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| 321 | result = comparator.get_result(); |
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| 322 | } // if |
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[51b7345] | 323 | #ifdef DEBUG |
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[a32b204] | 324 | std::cout << "============ unifyExact" << std::endl; |
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| 325 | std::cout << "type1 is "; |
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| 326 | type1->print( std::cout ); |
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| 327 | std::cout << std::endl << "type2 is "; |
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| 328 | type2->print( std::cout ); |
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| 329 | std::cout << std::endl << "openVars are "; |
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| 330 | printOpenVarSet( openVars, std::cout, 8 ); |
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| 331 | std::cout << std::endl << "input env is " << std::endl; |
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| 332 | debugEnv.print( std::cout, 8 ); |
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| 333 | std::cout << std::endl << "result env is " << std::endl; |
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| 334 | env.print( std::cout, 8 ); |
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| 335 | std::cout << "result is " << result << std::endl; |
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[51b7345] | 336 | #endif |
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[a32b204] | 337 | return result; |
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| 338 | } |
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| 339 | |
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| 340 | bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 341 | return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 342 | } |
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| 343 | |
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| 344 | bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ) { |
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| 345 | Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers(); |
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| 346 | type1->get_qualifiers() = Type::Qualifiers(); |
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| 347 | type2->get_qualifiers() = Type::Qualifiers(); |
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| 348 | bool result; |
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[51b7345] | 349 | #ifdef DEBUG |
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[a32b204] | 350 | std::cout << "unifyInexact type 1 is "; |
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| 351 | type1->print( std::cout ); |
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| 352 | std::cout << "type 2 is "; |
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| 353 | type2->print( std::cout ); |
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| 354 | std::cout << std::endl; |
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[51b7345] | 355 | #endif |
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[a32b204] | 356 | if ( ! unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ) ) { |
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[51b7345] | 357 | #ifdef DEBUG |
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[a32b204] | 358 | std::cout << "unifyInexact: no exact unification found" << std::endl; |
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[51b7345] | 359 | #endif |
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[a32b204] | 360 | if ( ( common = commonType( type1, type2, widenMode.widenFirst, widenMode.widenSecond, indexer, env, openVars ) ) ) { |
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| 361 | common->get_qualifiers() = tq1 + tq2; |
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[51b7345] | 362 | #ifdef DEBUG |
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[a32b204] | 363 | std::cout << "unifyInexact: common type is "; |
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| 364 | common->print( std::cout ); |
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| 365 | std::cout << std::endl; |
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[51b7345] | 366 | #endif |
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[a32b204] | 367 | result = true; |
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| 368 | } else { |
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[51b7345] | 369 | #ifdef DEBUG |
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[a32b204] | 370 | std::cout << "unifyInexact: no common type found" << std::endl; |
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[51b7345] | 371 | #endif |
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[a32b204] | 372 | result = false; |
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| 373 | } // if |
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| 374 | } else { |
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| 375 | if ( tq1 != tq2 ) { |
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| 376 | if ( ( tq1 > tq2 || widenMode.widenFirst ) && ( tq2 > tq1 || widenMode.widenSecond ) ) { |
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| 377 | common = type1->clone(); |
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| 378 | common->get_qualifiers() = tq1 + tq2; |
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| 379 | result = true; |
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| 380 | } else { |
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| 381 | result = false; |
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| 382 | } // if |
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| 383 | } else { |
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| 384 | result = true; |
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| 385 | } // if |
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| 386 | } // if |
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| 387 | type1->get_qualifiers() = tq1; |
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| 388 | type2->get_qualifiers() = tq2; |
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| 389 | return result; |
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| 390 | } |
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| 391 | |
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| 392 | Unify::Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) |
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| 393 | : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widenMode( widenMode ), indexer( indexer ) { |
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| 394 | } |
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| 395 | |
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| 396 | void Unify::visit(VoidType *voidType) { |
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| 397 | result = dynamic_cast< VoidType* >( type2 ); |
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| 398 | } |
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| 399 | |
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| 400 | void Unify::visit(BasicType *basicType) { |
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| 401 | if ( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) { |
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| 402 | result = basicType->get_kind() == otherBasic->get_kind(); |
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| 403 | } // if |
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| 404 | } |
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| 405 | |
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| 406 | void markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) { |
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[51b7345] | 407 | /// std::cout << "assertion set is" << std::endl; |
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| 408 | /// printAssertionSet( assertions, std::cout, 8 ); |
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| 409 | /// std::cout << "looking for "; |
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| 410 | /// assert->print( std::cout ); |
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| 411 | /// std::cout << std::endl; |
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[a32b204] | 412 | AssertionSet::iterator i = assertions.find( assert ); |
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| 413 | if ( i != assertions.end() ) { |
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[51b7345] | 414 | /// std::cout << "found it!" << std::endl; |
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[a32b204] | 415 | i->second = true; |
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| 416 | } // if |
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| 417 | } |
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| 418 | |
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| 419 | void markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) { |
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| 420 | for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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| 421 | for ( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
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| 422 | markAssertionSet( assertion1, *assert ); |
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| 423 | markAssertionSet( assertion2, *assert ); |
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| 424 | } // for |
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| 425 | } // for |
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| 426 | } |
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| 427 | |
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| 428 | void Unify::visit(PointerType *pointerType) { |
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| 429 | if ( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) { |
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| 430 | result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 431 | markAssertions( haveAssertions, needAssertions, pointerType ); |
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| 432 | markAssertions( haveAssertions, needAssertions, otherPointer ); |
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| 433 | } // if |
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| 434 | } |
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| 435 | |
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| 436 | void Unify::visit(ArrayType *arrayType) { |
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| 437 | ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 ); |
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[1cbca6e] | 438 | // to unify, array types must both be VLA or both not VLA |
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| 439 | // and must both have a dimension expression or not have a dimension |
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[41a2620] | 440 | if ( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() ) { |
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[1cbca6e] | 441 | |
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| 442 | // not positive this is correct in all cases, but it's needed for typedefs |
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| 443 | if ( arrayType->get_isVarLen() || otherArray->get_isVarLen() ) { |
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| 444 | return; |
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| 445 | } |
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| 446 | |
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| 447 | if ( ! arrayType->get_isVarLen() && ! otherArray->get_isVarLen() && |
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| 448 | arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0 ) { |
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| 449 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
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| 450 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( otherArray->get_dimension() ); |
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[41a2620] | 451 | // see C11 Reference Manual 6.7.6.2.6 |
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| 452 | // two array types with size specifiers that are integer constant expressions are |
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| 453 | // compatible if both size specifiers have the same constant value |
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| 454 | if ( ce1 && ce2 ) { |
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| 455 | Constant * c1 = ce1->get_constant(); |
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| 456 | Constant * c2 = ce2->get_constant(); |
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| 457 | |
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| 458 | if ( c1->get_value() != c2->get_value() ) { |
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| 459 | // does not unify if the dimension is different |
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| 460 | return; |
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| 461 | } |
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[1cbca6e] | 462 | } |
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| 463 | } |
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| 464 | |
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[a32b204] | 465 | result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 466 | } // if |
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| 467 | } |
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| 468 | |
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| 469 | template< typename Iterator1, typename Iterator2 > |
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| 470 | bool unifyDeclList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) { |
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| 471 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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[1cbca6e] | 472 | // Type * commonType; |
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| 473 | // if ( ! unifyInexact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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[a32b204] | 474 | if ( ! unifyExact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
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| 475 | return false; |
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| 476 | } // if |
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| 477 | } // for |
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| 478 | if ( list1Begin != list1End || list2Begin != list2End ) { |
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| 479 | return false; |
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| 480 | } else { |
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| 481 | return true; |
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| 482 | } // if |
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| 483 | } |
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| 484 | |
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| 485 | void Unify::visit(FunctionType *functionType) { |
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| 486 | FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 ); |
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| 487 | if ( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) { |
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[03da511] | 488 | if ( functionType->get_parameters().size() == otherFunction->get_parameters().size() && functionType->get_returnVals().size() == otherFunction->get_returnVals().size() ) { |
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| 489 | if ( unifyDeclList( functionType->get_parameters().begin(), functionType->get_parameters().end(), otherFunction->get_parameters().begin(), otherFunction->get_parameters().end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
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| 490 | if ( unifyDeclList( functionType->get_returnVals().begin(), functionType->get_returnVals().end(), otherFunction->get_returnVals().begin(), otherFunction->get_returnVals().end(), env, needAssertions, haveAssertions, openVars, indexer ) ) { |
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[1cbca6e] | 491 | |
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[03da511] | 492 | markAssertions( haveAssertions, needAssertions, functionType ); |
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| 493 | markAssertions( haveAssertions, needAssertions, otherFunction ); |
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[41a2620] | 494 | |
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[03da511] | 495 | result = true; |
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| 496 | } // if |
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[a32b204] | 497 | } // if |
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| 498 | } // if |
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| 499 | } // if |
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| 500 | } |
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| 501 | |
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| 502 | template< typename RefType > |
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[02ec390] | 503 | void Unify::handleRefType( RefType *inst, Type *other ) { |
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| 504 | // check that other type is compatible and named the same |
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[a32b204] | 505 | RefType *otherStruct = dynamic_cast< RefType* >( other ); |
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| 506 | result = otherStruct && inst->get_name() == otherStruct->get_name(); |
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[02ec390] | 507 | } |
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| 508 | |
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| 509 | template< typename RefType > |
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| 510 | void Unify::handleGenericRefType( RefType *inst, Type *other ) { |
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| 511 | // Check that other type is compatible and named the same |
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| 512 | handleRefType( inst, other ); |
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| 513 | if ( ! result ) return; |
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[f5234f3] | 514 | // Check that parameters of types unify, if any |
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[02ec390] | 515 | std::list< Expression* > params = inst->get_parameters(); |
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[f5234f3] | 516 | std::list< Expression* > otherParams = ((RefType*)other)->get_parameters(); |
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| 517 | |
---|
| 518 | std::list< Expression* >::const_iterator it = params.begin(), jt = otherParams.begin(); |
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| 519 | for ( ; it != params.end() && jt != otherParams.end(); ++it, ++jt ) { |
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| 520 | TypeExpr *param = dynamic_cast< TypeExpr* >(*it); |
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| 521 | assert(param && "Aggregate parameters should be type expressions"); |
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| 522 | TypeExpr *otherParam = dynamic_cast< TypeExpr* >(*jt); |
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| 523 | assert(otherParam && "Aggregate parameters should be type expressions"); |
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| 524 | |
---|
| 525 | if ( ! unifyExact( param->get_type(), otherParam->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode(false, false), indexer ) ) { |
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[02ec390] | 526 | result = false; |
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| 527 | return; |
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| 528 | } |
---|
| 529 | } |
---|
[f5234f3] | 530 | result = ( it == params.end() && jt == otherParams.end() ); |
---|
[02ec390] | 531 | } |
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[a32b204] | 532 | |
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| 533 | void Unify::visit(StructInstType *structInst) { |
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[02ec390] | 534 | handleGenericRefType( structInst, type2 ); |
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[a32b204] | 535 | } |
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| 536 | |
---|
| 537 | void Unify::visit(UnionInstType *unionInst) { |
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[02ec390] | 538 | handleGenericRefType( unionInst, type2 ); |
---|
[a32b204] | 539 | } |
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| 540 | |
---|
| 541 | void Unify::visit(EnumInstType *enumInst) { |
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| 542 | handleRefType( enumInst, type2 ); |
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| 543 | } |
---|
| 544 | |
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[4040425] | 545 | void Unify::visit(TraitInstType *contextInst) { |
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[a32b204] | 546 | handleRefType( contextInst, type2 ); |
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| 547 | } |
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| 548 | |
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| 549 | void Unify::visit(TypeInstType *typeInst) { |
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| 550 | assert( openVars.find( typeInst->get_name() ) == openVars.end() ); |
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| 551 | TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 ); |
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| 552 | if ( otherInst && typeInst->get_name() == otherInst->get_name() ) { |
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| 553 | result = true; |
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[51b7345] | 554 | /// } else { |
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| 555 | /// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() ); |
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[a32b204] | 556 | /// if ( nt ) { |
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[51b7345] | 557 | /// TypeDecl *type = dynamic_cast< TypeDecl* >( nt ); |
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| 558 | /// assert( type ); |
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[a32b204] | 559 | /// if ( type->get_base() ) { |
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[51b7345] | 560 | /// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 561 | /// } |
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| 562 | /// } |
---|
[a32b204] | 563 | } // if |
---|
| 564 | } |
---|
| 565 | |
---|
| 566 | template< typename Iterator1, typename Iterator2 > |
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| 567 | bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) { |
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| 568 | for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
---|
| 569 | Type *commonType = 0; |
---|
| 570 | if ( ! unifyInexact( *list1Begin, *list2Begin, env, needAssertions, haveAssertions, openVars, widenMode, indexer, commonType ) ) { |
---|
| 571 | return false; |
---|
| 572 | } |
---|
| 573 | delete commonType; |
---|
| 574 | } // for |
---|
| 575 | if ( list1Begin != list1End || list2Begin != list2End ) { |
---|
| 576 | return false; |
---|
| 577 | } else { |
---|
| 578 | return true; |
---|
| 579 | } //if |
---|
| 580 | } |
---|
| 581 | |
---|
| 582 | void Unify::visit(TupleType *tupleType) { |
---|
| 583 | if ( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) { |
---|
| 584 | result = unifyList( tupleType->get_types().begin(), tupleType->get_types().end(), otherTuple->get_types().begin(), otherTuple->get_types().end(), env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
---|
| 585 | } // if |
---|
| 586 | } |
---|
[51b7345] | 587 | |
---|
[44b7088] | 588 | void Unify::visit(VarArgsType *varArgsType) { |
---|
| 589 | result = dynamic_cast< VarArgsType* >( type2 ); |
---|
| 590 | } |
---|
| 591 | |
---|
[89e6ffc] | 592 | void Unify::visit(ZeroType *zeroType) { |
---|
| 593 | result = dynamic_cast< ZeroType* >( type2 ); |
---|
| 594 | } |
---|
| 595 | |
---|
| 596 | void Unify::visit(OneType *oneType) { |
---|
| 597 | result = dynamic_cast< OneType* >( type2 ); |
---|
| 598 | } |
---|
| 599 | |
---|
[51b7345] | 600 | } // namespace ResolvExpr |
---|
[a32b204] | 601 | |
---|
| 602 | // Local Variables: // |
---|
| 603 | // tab-width: 4 // |
---|
| 604 | // mode: c++ // |
---|
| 605 | // compile-command: "make install" // |
---|
| 606 | // End: // |
---|