[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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[30f9072] | 7 | // TypeEquality.cc -- |
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[cc79d97] | 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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[994ec2c] | 12 | // Last Modified On : Mon Jul 20 14:16:11 2015 |
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| 13 | // Update Count : 37 |
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[cc79d97] | 14 | // |
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| 15 | #include "TypeEquality.h" |
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| 16 | |
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[30f9072] | 17 | #include <cassert> // for assert |
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| 18 | #include <list> // for list, list<>::iterator, _List_iterator |
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| 19 | #include <string> // for operator==, string, basic_string |
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| 20 | |
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| 21 | #include "SynTree/Constant.h" // for Constant |
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| 22 | #include "SynTree/Declaration.h" // for DeclarationWithType |
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| 23 | #include "SynTree/Expression.h" // for ConstantExpr, Expression |
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| 24 | #include "SynTree/Type.h" // for Type, ArrayType, FunctionType, Enum... |
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| 25 | #include "SynTree/Visitor.h" // for Visitor |
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| 26 | |
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[cc79d97] | 27 | namespace SymTab { |
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| 28 | class TypeEquality : public Visitor { |
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| 29 | public: |
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[30f9072] | 30 | TypeEquality( Type * other, bool vlaErr ) : result( true ), other( other ), |
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[cc79d97] | 31 | vlaErr( vlaErr ) {} |
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| 32 | bool result; |
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| 33 | |
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| 34 | private: |
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| 35 | virtual void visit( FunctionType *funcType ); |
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| 36 | virtual void visit( VoidType *voidType ); |
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| 37 | virtual void visit( BasicType *basicType ); |
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| 38 | virtual void visit( PointerType *pointerType ); |
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| 39 | virtual void visit( ArrayType *arrayType ); |
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| 40 | virtual void visit( StructInstType *structInst ); |
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| 41 | virtual void visit( UnionInstType *unionInst ); |
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| 42 | virtual void visit( EnumInstType *enumInst ); |
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| 43 | virtual void visit( TypeInstType *typeInst ); |
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[44b7088] | 44 | virtual void visit( VarArgsType *varArgsType ); |
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[89e6ffc] | 45 | virtual void visit( ZeroType *zeroType ); |
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| 46 | virtual void visit( OneType *oneType ); |
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[cc79d97] | 47 | |
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| 48 | void handleQualifiers( Type * t ); |
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| 49 | |
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| 50 | Type * other; |
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| 51 | bool vlaErr; |
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| 52 | }; |
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| 53 | |
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| 54 | bool typeEquals( Type * t1, Type * t2, bool vlaErr ) { |
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| 55 | TypeEquality teq( t2, vlaErr ); |
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| 56 | t1->accept( teq ); |
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| 57 | return teq.result; |
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| 58 | } |
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| 59 | |
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| 60 | void TypeEquality::handleQualifiers( Type * t ) { |
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| 61 | result = result && t->get_qualifiers() == other->get_qualifiers(); |
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| 62 | } |
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| 63 | |
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| 64 | void TypeEquality::visit( VoidType *voidType ) { |
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| 65 | handleQualifiers( voidType ); |
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| 66 | if ( ! dynamic_cast< VoidType * >( other ) ) { |
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| 67 | result = false; |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | void TypeEquality::visit( BasicType *basicType ) { |
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| 72 | handleQualifiers( basicType ); |
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| 73 | if ( BasicType * bt = dynamic_cast< BasicType * >( other ) ) { |
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[30f9072] | 74 | result = result && basicType->get_kind() == bt->get_kind(); |
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[cc79d97] | 75 | } else { |
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| 76 | result = false; |
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| 77 | } |
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| 78 | } |
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| 79 | |
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| 80 | void TypeEquality::visit( PointerType *pointerType ) { |
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| 81 | handleQualifiers( pointerType ); |
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| 82 | if ( PointerType * pt = dynamic_cast< PointerType * >( other ) ) { |
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| 83 | other = pt->get_base(); |
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| 84 | pointerType->get_base()->accept( *this ); |
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| 85 | } else { |
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| 86 | result = false; |
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| 87 | } |
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| 88 | } |
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| 89 | |
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| 90 | void TypeEquality::visit( ArrayType *arrayType ) { |
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| 91 | handleQualifiers( arrayType ); |
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| 92 | |
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| 93 | if ( ArrayType * at = dynamic_cast< ArrayType * >( other ) ) { |
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| 94 | // to be equal, array types must both be VLA or both not VLA |
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| 95 | // and must both have a dimension expression or not have a dimension |
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| 96 | result = result && arrayType->get_isVarLen() == at->get_isVarLen() |
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[994ec2c] | 97 | && ((arrayType->get_dimension() != 0 && at->get_dimension() != 0) |
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| 98 | || (arrayType->get_dimension() == 0 && at->get_dimension() == 0)); |
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[cc79d97] | 99 | |
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| 100 | if ( vlaErr ) { |
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[30f9072] | 101 | // useful for comparing typedef types - in this case, we |
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[cc79d97] | 102 | // want types to appear distinct if either is a VLA type |
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| 103 | if ( arrayType->get_isVarLen() || at->get_isVarLen() ) { |
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| 104 | result = false; |
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| 105 | } |
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| 106 | } |
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| 107 | |
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[e5609dd] | 108 | if ( ! arrayType->get_isVarLen() && ! at->get_isVarLen() && |
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| 109 | arrayType->get_dimension() != 0 && at->get_dimension() != 0 ) { |
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[71bd8c6] | 110 | ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() ); |
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| 111 | ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( at->get_dimension() ); |
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| 112 | assert(ce1 && ce2); |
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| 113 | |
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| 114 | Constant * c1 = ce1->get_constant(); |
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| 115 | Constant * c2 = ce2->get_constant(); |
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| 116 | |
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| 117 | result = result && c1->get_value() == c2->get_value(); |
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| 118 | } |
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| 119 | |
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[cc79d97] | 120 | other = at->get_base(); |
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| 121 | arrayType->get_base()->accept( *this ); |
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| 122 | } else { |
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| 123 | result = false; |
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| 124 | } |
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| 125 | } |
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| 126 | |
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| 127 | void TypeEquality::visit( FunctionType *funcType ) { |
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| 128 | handleQualifiers( funcType ); |
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| 129 | |
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| 130 | if ( FunctionType * ft = dynamic_cast< FunctionType * >( other ) ) { |
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| 131 | // function types must have the same number of return types |
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| 132 | // and parameters to be equivalent |
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| 133 | result = result && funcType->get_returnVals().size() == ft->get_returnVals().size() |
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| 134 | && funcType->get_parameters().size() == ft->get_parameters().size() |
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| 135 | && funcType->get_isVarArgs() == ft->get_isVarArgs(); |
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| 136 | |
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| 137 | std::list< DeclarationWithType * >::iterator it1, it2; |
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| 138 | |
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| 139 | // return types must be equivalent |
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| 140 | it1 = funcType->get_returnVals().begin(); |
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| 141 | it2 = ft->get_returnVals().begin(); |
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| 142 | for ( ; it1 != funcType->get_returnVals().end(); ++it1, ++it2 ) { |
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| 143 | if ( ! result ) return; |
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| 144 | other = (*it2)->get_type(); |
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| 145 | (*it1)->get_type()->accept( *this ); |
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| 146 | } |
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| 147 | |
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| 148 | // parameter types must be equivalent |
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[30f9072] | 149 | it1 = funcType->get_parameters().begin(); |
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[cc79d97] | 150 | it2 = ft->get_parameters().begin(); |
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| 151 | for ( ; it1 != funcType->get_parameters().end(); ++it1, ++it2 ) { |
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| 152 | if ( ! result ) return; |
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| 153 | other = (*it2)->get_type(); |
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| 154 | (*it1)->get_type()->accept( *this ); |
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| 155 | } |
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| 156 | } else { |
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| 157 | result = false; |
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| 158 | } |
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| 159 | } |
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| 160 | |
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| 161 | // aggregate types only need to have the same name |
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| 162 | void TypeEquality::visit( StructInstType *structInst ) { |
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| 163 | handleQualifiers( structInst ); |
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| 164 | if ( StructInstType * st = dynamic_cast< StructInstType * >( other ) ) { |
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| 165 | result = result && structInst->get_name() == st->get_name(); |
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| 166 | } else { |
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| 167 | result = false; |
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| 168 | } |
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| 169 | } |
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| 170 | |
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| 171 | void TypeEquality::visit( UnionInstType *unionInst ) { |
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| 172 | handleQualifiers( unionInst ); |
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| 173 | if ( UnionInstType * ut = dynamic_cast< UnionInstType * >( other ) ) { |
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| 174 | result = result && unionInst->get_name() == ut->get_name(); |
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| 175 | } else { |
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| 176 | result = false; |
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| 177 | } |
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| 178 | } |
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| 179 | |
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| 180 | void TypeEquality::visit( EnumInstType *enumInst ) { |
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| 181 | handleQualifiers( enumInst ); |
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| 182 | if ( EnumInstType * et = dynamic_cast< EnumInstType * >( other ) ) { |
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| 183 | result = result && enumInst->get_name() == et->get_name(); |
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| 184 | } else { |
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| 185 | result = false; |
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| 186 | } |
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| 187 | } |
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| 188 | |
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| 189 | void TypeEquality::visit( TypeInstType *typeInst ) { |
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| 190 | handleQualifiers( typeInst ); |
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| 191 | if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( other ) ) { |
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| 192 | result = result && typeInst->get_name() == tt->get_name(); |
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| 193 | } else { |
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| 194 | result = false; |
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| 195 | } |
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| 196 | } |
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[44b7088] | 197 | |
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| 198 | void TypeEquality::visit( VarArgsType *varArgsType ) { |
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[540ddb7d] | 199 | handleQualifiers( varArgsType ); |
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[44b7088] | 200 | if ( ! dynamic_cast< VarArgsType * >( other ) ) { |
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| 201 | result = false; |
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| 202 | } |
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| 203 | } |
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[89e6ffc] | 204 | |
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| 205 | void TypeEquality::visit( ZeroType *zeroType ) { |
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| 206 | handleQualifiers( zeroType ); |
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| 207 | if ( ! dynamic_cast< ZeroType * >( other ) ) { |
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| 208 | result = false; |
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| 209 | } |
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| 210 | } |
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| 211 | |
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| 212 | void TypeEquality::visit( OneType *oneType ) { |
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| 213 | handleQualifiers( oneType ); |
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| 214 | if ( ! dynamic_cast< OneType * >( other ) ) { |
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| 215 | result = false; |
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| 216 | } |
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| 217 | } |
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[cc79d97] | 218 | } // namespace SymTab |
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