[51b7345] | 1 | /* |
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| 2 | * This file is part of the Cforall project |
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| 3 | * |
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| 4 | * $Id: Unify.cc,v 1.14 2005/08/29 20:14:16 rcbilson Exp $ |
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| 5 | * |
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| 6 | */ |
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| 7 | |
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| 8 | #include <set> |
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| 9 | #include <memory> |
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| 10 | |
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| 11 | #include "Unify.h" |
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| 12 | #include "TypeEnvironment.h" |
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| 13 | #include "typeops.h" |
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| 14 | #include "FindOpenVars.h" |
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| 15 | #include "SynTree/Visitor.h" |
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| 16 | #include "SynTree/Type.h" |
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| 17 | #include "SynTree/Declaration.h" |
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| 18 | #include "SymTab/Indexer.h" |
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| 19 | #include "utility.h" |
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| 20 | |
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| 21 | |
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| 22 | //#define DEBUG |
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| 23 | |
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| 24 | namespace ResolvExpr { |
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| 25 | |
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| 26 | struct WidenMode |
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| 27 | { |
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| 28 | WidenMode( bool widenFirst, bool widenSecond ): widenFirst( widenFirst ), widenSecond( widenSecond ) {} |
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| 29 | WidenMode &operator|=( const WidenMode &other ) { widenFirst |= other.widenFirst; widenSecond |= other.widenSecond; return *this; } |
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| 30 | WidenMode &operator&=( const WidenMode &other ) { widenFirst &= other.widenFirst; widenSecond &= other.widenSecond; return *this; } |
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| 31 | WidenMode operator|( const WidenMode &other ) { WidenMode newWM( *this ); newWM |= other; return newWM; } |
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| 32 | WidenMode operator&( const WidenMode &other ) { WidenMode newWM( *this ); newWM &= other; return newWM; } |
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| 33 | operator bool() { return widenFirst && widenSecond; } |
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| 34 | |
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| 35 | bool widenFirst : 1, widenSecond : 1; |
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| 36 | }; |
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| 37 | |
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| 38 | class Unify : public Visitor |
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| 39 | { |
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| 40 | public: |
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| 41 | Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ); |
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| 42 | |
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| 43 | bool get_result() const { return result; } |
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| 44 | |
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| 45 | private: |
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| 46 | virtual void visit(VoidType *voidType); |
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| 47 | virtual void visit(BasicType *basicType); |
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| 48 | virtual void visit(PointerType *pointerType); |
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| 49 | virtual void visit(ArrayType *arrayType); |
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| 50 | virtual void visit(FunctionType *functionType); |
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| 51 | virtual void visit(StructInstType *aggregateUseType); |
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| 52 | virtual void visit(UnionInstType *aggregateUseType); |
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| 53 | virtual void visit(EnumInstType *aggregateUseType); |
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| 54 | virtual void visit(ContextInstType *aggregateUseType); |
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| 55 | virtual void visit(TypeInstType *aggregateUseType); |
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| 56 | virtual void visit(TupleType *tupleType); |
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| 57 | |
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| 58 | template< typename RefType > void handleRefType( RefType *inst, Type *other ); |
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| 59 | |
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| 60 | bool result; |
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| 61 | Type *type2; // inherited |
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| 62 | TypeEnvironment &env; |
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| 63 | AssertionSet &needAssertions; |
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| 64 | AssertionSet &haveAssertions; |
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| 65 | const OpenVarSet &openVars; |
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| 66 | WidenMode widenMode; |
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| 67 | Type *commonType; |
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| 68 | const SymTab::Indexer &indexer; |
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| 69 | }; |
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| 70 | |
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| 71 | 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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| 72 | 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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| 73 | |
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| 74 | bool |
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| 75 | typesCompatible( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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| 76 | { |
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| 77 | TypeEnvironment newEnv; |
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| 78 | OpenVarSet openVars; |
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| 79 | AssertionSet needAssertions, haveAssertions; |
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| 80 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 81 | env.apply( newFirst ); |
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| 82 | env.apply( newSecond ); |
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| 83 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 84 | delete newFirst; |
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| 85 | delete newSecond; |
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| 86 | return result; |
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| 87 | } |
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| 88 | |
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| 89 | bool |
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| 90 | typesCompatibleIgnoreQualifiers( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) |
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| 91 | { |
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| 92 | TypeEnvironment newEnv; |
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| 93 | OpenVarSet openVars; |
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| 94 | AssertionSet needAssertions, haveAssertions; |
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| 95 | Type *newFirst = first->clone(), *newSecond = second->clone(); |
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| 96 | env.apply( newFirst ); |
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| 97 | env.apply( newSecond ); |
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| 98 | newFirst->get_qualifiers() = Type::Qualifiers(); |
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| 99 | newSecond->get_qualifiers() = Type::Qualifiers(); |
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| 100 | /// std::cout << "first is "; |
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| 101 | /// first->print( std::cout ); |
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| 102 | /// std::cout << std::endl << "second is "; |
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| 103 | /// second->print( std::cout ); |
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| 104 | /// std::cout << std::endl << "newFirst is "; |
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| 105 | /// newFirst->print( std::cout ); |
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| 106 | /// std::cout << std::endl << "newSecond is "; |
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| 107 | /// newSecond->print( std::cout ); |
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| 108 | /// std::cout << std::endl; |
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| 109 | bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 110 | delete newFirst; |
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| 111 | delete newSecond; |
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| 112 | return result; |
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| 113 | } |
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| 114 | |
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| 115 | bool |
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| 116 | isFtype( Type *type, const SymTab::Indexer &indexer ) |
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| 117 | { |
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| 118 | if( dynamic_cast< FunctionType* >( type ) ) { |
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| 119 | return true; |
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| 120 | } else if( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) { |
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| 121 | return typeInst->get_isFtype(); |
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| 122 | } |
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| 123 | return false; |
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| 124 | } |
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| 125 | |
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| 126 | bool |
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| 127 | tyVarCompatible( TypeDecl::Kind kind, Type *type, const SymTab::Indexer &indexer ) |
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| 128 | { |
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| 129 | switch( kind ) { |
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| 130 | case TypeDecl::Any: |
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| 131 | case TypeDecl::Dtype: |
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| 132 | return !isFtype( type, indexer ); |
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| 133 | |
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| 134 | case TypeDecl::Ftype: |
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| 135 | return isFtype( type, indexer ); |
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| 136 | } |
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| 137 | assert( false ); |
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| 138 | return false; |
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| 139 | } |
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| 140 | |
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| 141 | bool |
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| 142 | 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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| 143 | { |
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| 144 | OpenVarSet::const_iterator tyvar = openVars.find( typeInst->get_name() ); |
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| 145 | assert( tyvar != openVars.end() ); |
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| 146 | if( !tyVarCompatible( tyvar->second, other, indexer ) ) { |
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| 147 | return false; |
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| 148 | } |
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| 149 | if( occurs( other, typeInst->get_name(), env ) ) { |
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| 150 | return false; |
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| 151 | } |
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| 152 | EqvClass curClass; |
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| 153 | if( env.lookup( typeInst->get_name(), curClass ) ) { |
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| 154 | if( curClass.type ) { |
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| 155 | Type *common = 0; |
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| 156 | std::auto_ptr< Type > newType( curClass.type->clone() ); |
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| 157 | if( unifyInexact( newType.get(), other, env, needAssertions, haveAssertions, openVars, widenMode & WidenMode( curClass.allowWidening, true ), indexer, common ) ) { |
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| 158 | if( common ) { |
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| 159 | common->get_qualifiers() = Type::Qualifiers(); |
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| 160 | delete curClass.type; |
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| 161 | curClass.type = common; |
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| 162 | env.add( curClass ); |
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| 163 | } |
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| 164 | return true; |
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| 165 | } else { |
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| 166 | return false; |
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| 167 | } |
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| 168 | } else { |
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| 169 | curClass.type = other->clone(); |
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| 170 | curClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 171 | curClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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| 172 | env.add( curClass ); |
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| 173 | } |
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| 174 | } else { |
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| 175 | EqvClass newClass; |
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| 176 | newClass.vars.insert( typeInst->get_name() ); |
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| 177 | newClass.type = other->clone(); |
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| 178 | newClass.type->get_qualifiers() = Type::Qualifiers(); |
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| 179 | newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond; |
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| 180 | newClass.kind = kind; |
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| 181 | env.add( newClass ); |
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| 182 | } |
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| 183 | return true; |
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| 184 | } |
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| 185 | |
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| 186 | bool |
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| 187 | 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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| 188 | { |
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| 189 | bool result = true; |
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| 190 | EqvClass class1, class2; |
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| 191 | bool hasClass1 = false, hasClass2 = false; |
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| 192 | bool widen1 = false, widen2 = false; |
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| 193 | Type *type1 = 0, *type2 = 0; |
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| 194 | |
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| 195 | if( env.lookup( var1->get_name(), class1 ) ) { |
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| 196 | hasClass1 = true; |
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| 197 | if( class1.type ) { |
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| 198 | if( occurs( class1.type, var2->get_name(), env ) ) { |
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| 199 | return false; |
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| 200 | } |
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| 201 | type1 = class1.type->clone(); |
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| 202 | } |
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| 203 | widen1 = widenMode.widenFirst && class1.allowWidening; |
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| 204 | } |
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| 205 | if( env.lookup( var2->get_name(), class2 ) ) { |
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| 206 | hasClass2 = true; |
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| 207 | if( class2.type ) { |
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| 208 | if( occurs( class2.type, var1->get_name(), env ) ) { |
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| 209 | return false; |
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| 210 | } |
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| 211 | type2 = class2.type->clone(); |
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| 212 | } |
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| 213 | widen2 = widenMode.widenSecond && class2.allowWidening; |
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| 214 | } |
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| 215 | |
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| 216 | if( type1 && type2 ) { |
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| 217 | // std::cout << "has type1 && type2" << std::endl; |
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| 218 | WidenMode newWidenMode ( widen1, widen2 ); |
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| 219 | Type *common = 0; |
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| 220 | if( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, newWidenMode, indexer, common ) ) { |
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| 221 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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| 222 | class1.allowWidening = widen1 && widen2; |
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| 223 | if( common ) { |
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| 224 | common->get_qualifiers() = Type::Qualifiers(); |
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| 225 | delete class1.type; |
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| 226 | class1.type = common; |
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| 227 | } |
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| 228 | env.add( class1 ); |
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| 229 | } else { |
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| 230 | result = false; |
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| 231 | } |
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| 232 | } else if( hasClass1 && hasClass2 ) { |
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| 233 | if( type1 ) { |
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| 234 | class1.vars.insert( class2.vars.begin(), class2.vars.end() ); |
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| 235 | class1.allowWidening = widen1; |
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| 236 | env.add( class1 ); |
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| 237 | } else { |
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| 238 | class2.vars.insert( class1.vars.begin(), class1.vars.end() ); |
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| 239 | class2.allowWidening = widen2; |
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| 240 | env.add( class2 ); |
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| 241 | } |
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| 242 | } else if( hasClass1 ) { |
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| 243 | class1.vars.insert( var2->get_name() ); |
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| 244 | class1.allowWidening = widen1; |
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| 245 | env.add( class1 ); |
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| 246 | } else if( hasClass2 ) { |
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| 247 | class2.vars.insert( var1->get_name() ); |
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| 248 | class2.allowWidening = widen2; |
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| 249 | env.add( class2 ); |
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| 250 | } else { |
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| 251 | EqvClass newClass; |
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| 252 | newClass.vars.insert( var1->get_name() ); |
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| 253 | newClass.vars.insert( var2->get_name() ); |
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| 254 | newClass.allowWidening = widen1 && widen2; |
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| 255 | newClass.kind = kind; |
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| 256 | env.add( newClass ); |
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| 257 | } |
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| 258 | delete type1; |
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| 259 | delete type2; |
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| 260 | return result; |
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| 261 | } |
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| 262 | |
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| 263 | bool |
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| 264 | unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) |
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| 265 | { |
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| 266 | OpenVarSet closedVars; |
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| 267 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 268 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 269 | Type *commonType = 0; |
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| 270 | if( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) { |
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| 271 | if( commonType ) { |
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| 272 | delete commonType; |
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| 273 | } |
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| 274 | return true; |
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| 275 | } else { |
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| 276 | return false; |
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| 277 | } |
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| 278 | } |
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| 279 | |
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| 280 | bool |
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| 281 | unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) |
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| 282 | { |
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| 283 | OpenVarSet closedVars; |
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| 284 | findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false ); |
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| 285 | findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true ); |
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| 286 | return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ); |
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| 287 | } |
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| 288 | |
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| 289 | bool |
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| 290 | unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) |
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| 291 | { |
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| 292 | #ifdef DEBUG |
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| 293 | TypeEnvironment debugEnv( env ); |
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| 294 | #endif |
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| 295 | bool result; |
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| 296 | TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 ); |
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| 297 | TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 ); |
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| 298 | OpenVarSet::const_iterator entry1, entry2; |
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| 299 | if( var1 ) { |
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| 300 | entry1 = openVars.find( var1->get_name() ); |
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| 301 | } |
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| 302 | if( var2 ) { |
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| 303 | entry2 = openVars.find( var2->get_name() ); |
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| 304 | } |
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| 305 | bool isopen1 = var1 && ( entry1 != openVars.end() ); |
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| 306 | bool isopen2 = var2 && ( entry2 != openVars.end() ); |
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| 307 | if( type1->get_qualifiers() != type2->get_qualifiers() ) { |
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| 308 | return false; |
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| 309 | } else if( isopen1 && isopen2 && entry1->second == entry2->second ) { |
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| 310 | result = bindVarToVar( var1, var2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 311 | } else if( isopen1 ) { |
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| 312 | result = bindVar( var1, type2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 313 | } else if( isopen2 ) { |
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| 314 | result = bindVar( var2, type1, entry2->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 315 | } else { |
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| 316 | Unify comparator( type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 317 | type1->accept( comparator ); |
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| 318 | result = comparator.get_result(); |
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| 319 | } |
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| 320 | #ifdef DEBUG |
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| 321 | std::cout << "============ unifyExact" << std::endl; |
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| 322 | std::cout << "type1 is "; |
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| 323 | type1->print( std::cout ); |
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| 324 | std::cout << std::endl << "type2 is "; |
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| 325 | type2->print( std::cout ); |
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| 326 | std::cout << std::endl << "openVars are "; |
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| 327 | printOpenVarSet( openVars, std::cout, 8 ); |
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| 328 | std::cout << std::endl << "input env is " << std::endl; |
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| 329 | debugEnv.print( std::cout, 8 ); |
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| 330 | std::cout << std::endl << "result env is " << std::endl; |
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| 331 | env.print( std::cout, 8 ); |
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| 332 | std::cout << "result is " << result << std::endl; |
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| 333 | #endif |
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| 334 | return result; |
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| 335 | } |
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| 336 | |
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| 337 | bool |
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| 338 | unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) |
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| 339 | { |
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| 340 | return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 341 | } |
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| 342 | |
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| 343 | bool |
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| 344 | 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 | { |
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| 346 | Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers(); |
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| 347 | type1->get_qualifiers() = Type::Qualifiers(); |
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| 348 | type2->get_qualifiers() = Type::Qualifiers(); |
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| 349 | bool result; |
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| 350 | #ifdef DEBUG |
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| 351 | std::cout << "unifyInexact type 1 is "; |
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| 352 | type1->print( std::cout ); |
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| 353 | std::cout << "type 2 is "; |
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| 354 | type2->print( std::cout ); |
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| 355 | std::cout << std::endl; |
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| 356 | #endif |
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| 357 | if( !unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ) ) { |
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| 358 | #ifdef DEBUG |
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| 359 | std::cout << "unifyInexact: no exact unification found" << std::endl; |
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| 360 | #endif |
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| 361 | if( ( common = commonType( type1, type2, widenMode.widenFirst, widenMode.widenSecond, indexer, env, openVars ) ) ) { |
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| 362 | common->get_qualifiers() = tq1 + tq2; |
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| 363 | #ifdef DEBUG |
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| 364 | std::cout << "unifyInexact: common type is "; |
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| 365 | common->print( std::cout ); |
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| 366 | std::cout << std::endl; |
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| 367 | #endif |
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| 368 | result = true; |
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| 369 | } else { |
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| 370 | #ifdef DEBUG |
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| 371 | std::cout << "unifyInexact: no common type found" << std::endl; |
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| 372 | #endif |
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| 373 | result = false; |
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| 374 | } |
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| 375 | } else { |
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| 376 | if( tq1 != tq2 ) { |
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| 377 | if( ( tq1 > tq2 || widenMode.widenFirst ) && ( tq2 > tq1 || widenMode.widenSecond ) ) { |
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| 378 | common = type1->clone(); |
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| 379 | common->get_qualifiers() = tq1 + tq2; |
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| 380 | result = true; |
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| 381 | } else { |
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| 382 | result = false; |
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| 383 | } |
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| 384 | } else { |
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| 385 | result = true; |
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| 386 | } |
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| 387 | } |
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| 388 | type1->get_qualifiers() = tq1; |
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| 389 | type2->get_qualifiers() = tq2; |
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| 390 | return result; |
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| 391 | } |
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| 392 | |
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| 393 | Unify::Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) |
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| 394 | : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widenMode( widenMode ), indexer( indexer ) |
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| 395 | { |
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| 396 | } |
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| 397 | |
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| 398 | void |
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| 399 | Unify::visit(VoidType *voidType) |
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| 400 | { |
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| 401 | result = dynamic_cast< VoidType* >( type2 ); |
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| 402 | } |
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| 403 | |
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| 404 | void |
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| 405 | Unify::visit(BasicType *basicType) |
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| 406 | { |
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| 407 | if( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) { |
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| 408 | result = basicType->get_kind() == otherBasic->get_kind(); |
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| 409 | } |
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| 410 | } |
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| 411 | |
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| 412 | void |
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| 413 | markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) |
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| 414 | { |
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| 415 | /// std::cout << "assertion set is" << std::endl; |
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| 416 | /// printAssertionSet( assertions, std::cout, 8 ); |
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| 417 | /// std::cout << "looking for "; |
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| 418 | /// assert->print( std::cout ); |
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| 419 | /// std::cout << std::endl; |
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| 420 | AssertionSet::iterator i = assertions.find( assert ); |
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| 421 | if( i != assertions.end() ) { |
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| 422 | /// std::cout << "found it!" << std::endl; |
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| 423 | i->second = true; |
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| 424 | } |
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| 425 | } |
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| 426 | |
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| 427 | void |
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| 428 | markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) |
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| 429 | { |
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| 430 | for( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) { |
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| 431 | for( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) { |
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| 432 | markAssertionSet( assertion1, *assert ); |
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| 433 | markAssertionSet( assertion2, *assert ); |
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| 434 | } |
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| 435 | } |
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| 436 | } |
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| 437 | |
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| 438 | void |
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| 439 | Unify::visit(PointerType *pointerType) |
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| 440 | { |
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| 441 | if( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) { |
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| 442 | result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 443 | markAssertions( haveAssertions, needAssertions, pointerType ); |
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| 444 | markAssertions( haveAssertions, needAssertions, otherPointer ); |
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| 445 | } |
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| 446 | } |
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| 447 | |
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| 448 | void |
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| 449 | Unify::visit(ArrayType *arrayType) |
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| 450 | { |
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| 451 | // XXX -- compare array dimension |
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| 452 | ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 ); |
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| 453 | if( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() ) { |
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| 454 | result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 455 | } |
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| 456 | } |
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| 457 | |
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| 458 | template< typename Iterator1, typename Iterator2 > |
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| 459 | bool |
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| 460 | 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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| 461 | for( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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| 462 | if( !unifyExact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) { |
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| 463 | return false; |
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| 464 | } |
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| 465 | } |
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| 466 | if( list1Begin != list1End || list2Begin != list2End ) { |
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| 467 | return false; |
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| 468 | } else { |
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| 469 | return true; |
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| 470 | } |
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| 471 | } |
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| 472 | |
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| 473 | void |
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| 474 | Unify::visit(FunctionType *functionType) |
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| 475 | { |
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| 476 | FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 ); |
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| 477 | if( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) { |
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| 478 | |
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| 479 | 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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| 480 | |
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| 481 | 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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| 482 | |
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| 483 | markAssertions( haveAssertions, needAssertions, functionType ); |
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| 484 | markAssertions( haveAssertions, needAssertions, otherFunction ); |
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| 485 | |
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| 486 | result = true; |
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| 487 | } |
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| 488 | } |
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| 489 | } |
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| 490 | } |
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| 491 | |
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| 492 | template< typename RefType > |
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| 493 | void |
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| 494 | Unify::handleRefType( RefType *inst, Type *other ) |
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| 495 | { |
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| 496 | RefType *otherStruct = dynamic_cast< RefType* >( other ); |
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| 497 | result = otherStruct && inst->get_name() == otherStruct->get_name(); |
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| 498 | } |
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| 499 | |
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| 500 | void |
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| 501 | Unify::visit(StructInstType *structInst) |
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| 502 | { |
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| 503 | handleRefType( structInst, type2 ); |
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| 504 | } |
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| 505 | |
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| 506 | void |
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| 507 | Unify::visit(UnionInstType *unionInst) |
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| 508 | { |
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| 509 | handleRefType( unionInst, type2 ); |
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| 510 | } |
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| 511 | |
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| 512 | void |
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| 513 | Unify::visit(EnumInstType *enumInst) |
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| 514 | { |
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| 515 | handleRefType( enumInst, type2 ); |
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| 516 | } |
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| 517 | |
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| 518 | void |
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| 519 | Unify::visit(ContextInstType *contextInst) |
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| 520 | { |
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| 521 | handleRefType( contextInst, type2 ); |
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| 522 | } |
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| 523 | |
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| 524 | void |
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| 525 | Unify::visit(TypeInstType *typeInst) |
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| 526 | { |
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| 527 | assert( openVars.find( typeInst->get_name() ) == openVars.end() ); |
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| 528 | TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 ); |
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| 529 | if( otherInst && typeInst->get_name() == otherInst->get_name() ) { |
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| 530 | result = true; |
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| 531 | /// } else { |
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| 532 | /// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() ); |
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| 533 | /// if( nt ) { |
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| 534 | /// TypeDecl *type = dynamic_cast< TypeDecl* >( nt ); |
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| 535 | /// assert( type ); |
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| 536 | /// if( type->get_base() ) { |
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| 537 | /// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ); |
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| 538 | /// } |
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| 539 | /// } |
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| 540 | } |
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| 541 | } |
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| 542 | |
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| 543 | template< typename Iterator1, typename Iterator2 > |
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| 544 | bool |
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| 545 | 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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| 546 | for( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) { |
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| 547 | Type *commonType = 0; |
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| 548 | if( !unifyInexact( *list1Begin, *list2Begin, env, needAssertions, haveAssertions, openVars, widenMode, indexer, commonType ) ) { |
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| 549 | return false; |
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| 550 | } |
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| 551 | delete commonType; |
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| 552 | } |
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| 553 | if( list1Begin != list1End || list2Begin != list2End ) { |
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| 554 | return false; |
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| 555 | } else { |
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| 556 | return true; |
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| 557 | } |
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| 558 | } |
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| 559 | |
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| 560 | void |
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| 561 | Unify::visit(TupleType *tupleType) |
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| 562 | { |
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| 563 | if( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) { |
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| 564 | result = unifyList( tupleType->get_types().begin(), tupleType->get_types().end(), otherTuple->get_types().begin(), otherTuple->get_types().end(), env, needAssertions, haveAssertions, openVars, widenMode, indexer ); |
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| 565 | } |
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| 566 | } |
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| 567 | |
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| 568 | } // namespace ResolvExpr |
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