[cc79d97] | 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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| 7 | // TypeEquality.cc -- |
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| 8 | // |
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| 9 | // Author : Rob Schluntz |
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| 10 | // Created On : Tue Jul 07 16:28:29 2015 |
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| 11 | // Last Modified By : Rob Schluntz |
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[e5609dd] | 12 | // Last Modified On : Thu Jul 09 11:18:46 2015 |
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| 13 | // Update Count : 36 |
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[cc79d97] | 14 | // |
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| 15 | |
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| 16 | #include <list> |
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| 17 | #include <iterator> |
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| 18 | #include "Validate.h" |
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| 19 | #include "SynTree/Visitor.h" |
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| 20 | #include "SynTree/Type.h" |
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| 21 | #include "SynTree/Statement.h" |
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| 22 | #include "SynTree/TypeSubstitution.h" |
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| 23 | #include "Indexer.h" |
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| 24 | #include "TypeEquality.h" |
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| 25 | |
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| 26 | namespace SymTab { |
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| 27 | class TypeEquality : public Visitor { |
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| 28 | public: |
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| 29 | TypeEquality( Type * other, bool vlaErr ) : result( true ), other( other ), |
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| 30 | vlaErr( vlaErr ) {} |
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| 31 | bool result; |
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| 32 | |
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| 33 | private: |
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| 34 | virtual void visit( FunctionType *funcType ); |
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| 35 | virtual void visit( VoidType *voidType ); |
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| 36 | virtual void visit( BasicType *basicType ); |
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| 37 | virtual void visit( PointerType *pointerType ); |
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| 38 | virtual void visit( ArrayType *arrayType ); |
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| 39 | virtual void visit( StructInstType *structInst ); |
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| 40 | virtual void visit( UnionInstType *unionInst ); |
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| 41 | virtual void visit( EnumInstType *enumInst ); |
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| 42 | virtual void visit( TypeInstType *typeInst ); |
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| 43 | |
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| 44 | void handleQualifiers( Type * t ); |
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| 45 | |
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| 46 | Type * other; |
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| 47 | bool vlaErr; |
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| 48 | }; |
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| 49 | |
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| 50 | bool typeEquals( Type * t1, Type * t2, bool vlaErr ) { |
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| 51 | TypeEquality teq( t2, vlaErr ); |
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| 52 | t1->accept( teq ); |
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| 53 | return teq.result; |
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| 54 | } |
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| 55 | |
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| 56 | void TypeEquality::handleQualifiers( Type * t ) { |
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| 57 | result = result && t->get_qualifiers() == other->get_qualifiers(); |
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| 58 | } |
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| 59 | |
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| 60 | void TypeEquality::visit( VoidType *voidType ) { |
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| 61 | handleQualifiers( voidType ); |
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| 62 | if ( ! dynamic_cast< VoidType * >( other ) ) { |
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| 63 | result = false; |
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| 64 | } |
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| 65 | } |
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| 66 | |
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| 67 | void TypeEquality::visit( BasicType *basicType ) { |
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| 68 | handleQualifiers( basicType ); |
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| 69 | if ( BasicType * bt = dynamic_cast< BasicType * >( other ) ) { |
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| 70 | result = result && basicType->get_kind() == bt->get_kind(); |
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| 71 | } else { |
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| 72 | result = false; |
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| 73 | } |
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| 74 | } |
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| 75 | |
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| 76 | void TypeEquality::visit( PointerType *pointerType ) { |
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| 77 | handleQualifiers( pointerType ); |
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| 78 | if ( PointerType * pt = dynamic_cast< PointerType * >( other ) ) { |
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| 79 | other = pt->get_base(); |
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| 80 | pointerType->get_base()->accept( *this ); |
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| 81 | } else { |
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| 82 | result = false; |
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| 83 | } |
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| 84 | } |
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| 85 | |
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| 86 | void TypeEquality::visit( ArrayType *arrayType ) { |
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| 87 | handleQualifiers( arrayType ); |
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| 88 | |
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| 89 | if ( ArrayType * at = dynamic_cast< ArrayType * >( other ) ) { |
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| 90 | // to be equal, array types must both be VLA or both not VLA |
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| 91 | // and must both have a dimension expression or not have a dimension |
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| 92 | result = result && arrayType->get_isVarLen() == at->get_isVarLen() |
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| 93 | && (arrayType->get_dimension() != 0 && at->get_dimension() != 0 |
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| 94 | || arrayType->get_dimension() == 0 && at->get_dimension() == 0); |
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| 95 | |
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| 96 | if ( vlaErr ) { |
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| 97 | // useful for comparing typedef types - in this case, we |
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| 98 | // want types to appear distinct if either is a VLA type |
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| 99 | if ( arrayType->get_isVarLen() || at->get_isVarLen() ) { |
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| 100 | result = false; |
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| 101 | } |
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| 102 | } |
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| 103 | |
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[e5609dd] | 104 | if ( ! arrayType->get_isVarLen() && ! at->get_isVarLen() && |
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| 105 | arrayType->get_dimension() != 0 && at->get_dimension() != 0 ) { |
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[71bd8c6] | 106 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
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| 107 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( at->get_dimension() ); |
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| 108 | assert(ce1 && ce2); |
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| 109 | |
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| 110 | Constant * c1 = ce1->get_constant(); |
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| 111 | Constant * c2 = ce2->get_constant(); |
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| 112 | |
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| 113 | result = result && c1->get_value() == c2->get_value(); |
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| 114 | } |
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| 115 | |
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[cc79d97] | 116 | other = at->get_base(); |
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| 117 | arrayType->get_base()->accept( *this ); |
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| 118 | } else { |
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| 119 | result = false; |
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| 120 | } |
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| 121 | } |
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| 122 | |
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| 123 | void TypeEquality::visit( FunctionType *funcType ) { |
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| 124 | handleQualifiers( funcType ); |
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| 125 | |
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| 126 | if ( FunctionType * ft = dynamic_cast< FunctionType * >( other ) ) { |
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| 127 | // function types must have the same number of return types |
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| 128 | // and parameters to be equivalent |
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| 129 | result = result && funcType->get_returnVals().size() == ft->get_returnVals().size() |
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| 130 | && funcType->get_parameters().size() == ft->get_parameters().size() |
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| 131 | && funcType->get_isVarArgs() == ft->get_isVarArgs(); |
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| 132 | |
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| 133 | std::list< DeclarationWithType * >::iterator it1, it2; |
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| 134 | |
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| 135 | // return types must be equivalent |
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| 136 | it1 = funcType->get_returnVals().begin(); |
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| 137 | it2 = ft->get_returnVals().begin(); |
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| 138 | for ( ; it1 != funcType->get_returnVals().end(); ++it1, ++it2 ) { |
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| 139 | if ( ! result ) return; |
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| 140 | other = (*it2)->get_type(); |
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| 141 | (*it1)->get_type()->accept( *this ); |
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| 142 | } |
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| 143 | |
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| 144 | // parameter types must be equivalent |
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| 145 | it1 = funcType->get_parameters().begin(); |
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| 146 | it2 = ft->get_parameters().begin(); |
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| 147 | for ( ; it1 != funcType->get_parameters().end(); ++it1, ++it2 ) { |
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| 148 | if ( ! result ) return; |
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| 149 | other = (*it2)->get_type(); |
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| 150 | (*it1)->get_type()->accept( *this ); |
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| 151 | } |
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| 152 | } else { |
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| 153 | result = false; |
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| 154 | } |
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| 155 | } |
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| 156 | |
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| 157 | // aggregate types only need to have the same name |
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| 158 | void TypeEquality::visit( StructInstType *structInst ) { |
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| 159 | handleQualifiers( structInst ); |
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| 160 | if ( StructInstType * st = dynamic_cast< StructInstType * >( other ) ) { |
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| 161 | result = result && structInst->get_name() == st->get_name(); |
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| 162 | } else { |
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| 163 | result = false; |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | void TypeEquality::visit( UnionInstType *unionInst ) { |
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| 168 | handleQualifiers( unionInst ); |
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| 169 | if ( UnionInstType * ut = dynamic_cast< UnionInstType * >( other ) ) { |
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| 170 | result = result && unionInst->get_name() == ut->get_name(); |
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| 171 | } else { |
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| 172 | result = false; |
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| 173 | } |
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| 174 | } |
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| 175 | |
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| 176 | void TypeEquality::visit( EnumInstType *enumInst ) { |
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| 177 | handleQualifiers( enumInst ); |
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| 178 | if ( EnumInstType * et = dynamic_cast< EnumInstType * >( other ) ) { |
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| 179 | result = result && enumInst->get_name() == et->get_name(); |
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| 180 | } else { |
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| 181 | result = false; |
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| 182 | } |
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| 183 | } |
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| 184 | |
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| 185 | void TypeEquality::visit( TypeInstType *typeInst ) { |
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| 186 | handleQualifiers( typeInst ); |
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| 187 | if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( other ) ) { |
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| 188 | result = result && typeInst->get_name() == tt->get_name(); |
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| 189 | } else { |
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| 190 | result = false; |
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| 191 | } |
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| 192 | } |
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| 193 | } // namespace SymTab |
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