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 | // TypeSubstitution.h -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Mon May 18 07:44:20 2015 |
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11 | // Last Modified By : Peter A. Buhr |
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12 | // Last Modified On : Sat Jul 22 09:52:24 2017 |
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13 | // Update Count : 3 |
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14 | // |
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15 | |
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16 | #pragma once |
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17 | |
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18 | #include <cassert> // for assert |
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19 | #include <iosfwd> // for ostream |
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20 | #include <list> // for list<>::iterator, _List_iterator |
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21 | #include <map> // for _Rb_tree_iterator, map, map<>::val... |
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22 | #include <set> // for set |
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23 | #include <string> // for string, operator!= |
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24 | #include <utility> // for pair |
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25 | |
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26 | #include "Common/SemanticError.h" // for SemanticError |
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27 | #include "SynTree/Declaration.h" // for TypeDecl, Declaration (ptr only) |
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28 | #include "SynTree/Expression.h" // for Expression (ptr only), NameExpr (p... |
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29 | #include "SynTree/Mutator.h" // for Mutator |
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30 | #include "SynTree/Type.h" // for Type, ArrayType (ptr only), BasicT... |
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31 | |
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32 | class TypeSubstitution : public Mutator { |
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33 | typedef Mutator Parent; |
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34 | public: |
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35 | TypeSubstitution(); |
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36 | template< typename FormalIterator, typename ActualIterator > |
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37 | TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
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38 | TypeSubstitution( const TypeSubstitution &other ); |
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39 | virtual ~TypeSubstitution(); |
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40 | |
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41 | TypeSubstitution &operator=( const TypeSubstitution &other ); |
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42 | |
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43 | template< typename SynTreeClass > int apply( SynTreeClass *&input ); |
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44 | template< typename SynTreeClass > int applyFree( SynTreeClass *&input ); |
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45 | |
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46 | void add( std::string formalType, Type *actualType ); |
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47 | void add( const TypeSubstitution &other ); |
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48 | void remove( std::string formalType ); |
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49 | Type *lookup( std::string formalType ) const; |
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50 | bool empty() const; |
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51 | |
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52 | template< typename FormalIterator, typename ActualIterator > |
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53 | void add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
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54 | |
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55 | /// this function is unused... |
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56 | template< typename TypeInstListIterator > |
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57 | void extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ); |
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58 | |
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59 | void normalize(); |
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60 | |
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61 | TypeSubstitution * acceptMutator( Mutator & mutator ); |
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62 | |
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63 | void print( std::ostream &os, Indenter indent = {} ) const; |
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64 | TypeSubstitution *clone() const { return new TypeSubstitution( *this ); } |
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65 | private: |
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66 | virtual Type* mutate(TypeInstType *aggregateUseType); |
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67 | virtual Expression* mutate(NameExpr *nameExpr); |
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68 | |
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69 | /// Records type variable bindings from forall-statements |
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70 | template< typename TypeClass > Type *handleType( TypeClass *type ); |
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71 | /// Records type variable bindings from forall-statements and instantiations of generic types |
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72 | template< typename TypeClass > Type *handleAggregateType( TypeClass *type ); |
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73 | |
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74 | virtual Type* mutate(VoidType *basicType); |
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75 | virtual Type* mutate(BasicType *basicType); |
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76 | virtual Type* mutate(PointerType *pointerType); |
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77 | virtual Type* mutate(ArrayType *arrayType); |
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78 | virtual Type* mutate(FunctionType *functionType); |
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79 | virtual Type* mutate(StructInstType *aggregateUseType); |
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80 | virtual Type* mutate(UnionInstType *aggregateUseType); |
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81 | virtual Type* mutate(EnumInstType *aggregateUseType); |
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82 | virtual Type* mutate(TraitInstType *aggregateUseType); |
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83 | virtual Type* mutate(TupleType *tupleType); |
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84 | virtual Type* mutate(VarArgsType *varArgsType); |
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85 | virtual Type* mutate(ZeroType *zeroType); |
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86 | virtual Type* mutate(OneType *oneType); |
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87 | |
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88 | // TODO: worry about traversing into a forall-qualified function type or type decl with assertions |
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89 | |
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90 | void initialize( const TypeSubstitution &src, TypeSubstitution &dest ); |
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91 | |
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92 | typedef std::map< std::string, Type* > TypeEnvType; |
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93 | typedef std::map< std::string, Expression* > VarEnvType; |
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94 | typedef std::set< std::string > BoundVarsType; |
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95 | TypeEnvType typeEnv; |
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96 | VarEnvType varEnv; |
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97 | BoundVarsType boundVars; |
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98 | int subCount; |
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99 | bool freeOnly; |
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100 | }; |
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101 | |
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102 | template< typename FormalIterator, typename ActualIterator > |
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103 | void TypeSubstitution::add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) { |
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104 | // FormalIterator points to a TypeDecl |
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105 | // ActualIterator points to a Type |
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106 | FormalIterator formalIt = formalBegin; |
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107 | ActualIterator actualIt = actualBegin; |
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108 | for ( ; formalIt != formalEnd; ++formalIt, ++actualIt ) { |
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109 | if ( TypeDecl *formal = dynamic_cast< TypeDecl* >( *formalIt ) ) { |
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110 | if ( TypeExpr *actual = dynamic_cast< TypeExpr* >( *actualIt ) ) { |
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111 | if ( formal->get_name() != "" ) { |
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112 | TypeEnvType::iterator i = typeEnv.find( formal->get_name() ); |
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113 | if ( i != typeEnv.end() ) { |
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114 | delete i->second; |
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115 | } // if |
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116 | typeEnv[ formal->get_name() ] = actual->get_type()->clone(); |
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117 | } // if |
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118 | } else { |
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119 | throw SemanticError( toString( "Attempt to provide non-type parameter: ", toString( *actualIt ).c_str(), " for type parameter " ), formal ); |
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120 | } // if |
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121 | } else { |
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122 | // TODO: type check the formal and actual parameters |
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123 | if ( (*formalIt)->get_name() != "" ) { |
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124 | varEnv[ (*formalIt)->get_name() ] = (*actualIt)->clone(); |
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125 | } // if |
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126 | } // if |
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127 | } // for |
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128 | } |
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129 | |
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130 | template< typename FormalIterator, typename ActualIterator > |
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131 | TypeSubstitution::TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) |
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132 | { |
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133 | add( formalBegin, formalEnd, actualBegin ); |
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134 | } |
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135 | |
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136 | template< typename SynTreeClass > |
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137 | int TypeSubstitution::apply( SynTreeClass *&input ) { |
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138 | assert( input ); |
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139 | subCount = 0; |
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140 | freeOnly = false; |
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141 | input = dynamic_cast< SynTreeClass *>( input->acceptMutator( *this ) ); |
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142 | assert( input ); |
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143 | /// std::cout << "substitution result is: "; |
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144 | /// newType->print( std::cout ); |
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145 | /// std::cout << std::endl; |
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146 | return subCount; |
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147 | } |
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148 | |
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149 | template< typename SynTreeClass > |
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150 | int TypeSubstitution::applyFree( SynTreeClass *&input ) { |
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151 | assert( input ); |
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152 | subCount = 0; |
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153 | freeOnly = true; |
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154 | input = dynamic_cast< SynTreeClass *>( input->acceptMutator( *this ) ); |
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155 | assert( input ); |
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156 | /// std::cout << "substitution result is: "; |
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157 | /// newType->print( std::cout ); |
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158 | /// std::cout << std::endl; |
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159 | return subCount; |
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160 | } |
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161 | |
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162 | template< typename TypeInstListIterator > |
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163 | void TypeSubstitution::extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ) { |
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164 | // xxx - this function doesn't extract varEnv - is this intentional? |
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165 | while ( begin != end ) { |
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166 | TypeEnvType::iterator cur = typeEnv.find( (*begin++)->get_name() ); |
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167 | if ( cur != typeEnv.end() ) { |
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168 | result.typeEnv[ cur->first ] = cur->second; |
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169 | typeEnv.erase( cur ); |
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170 | } // if |
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171 | } // while |
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172 | } |
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173 | |
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174 | /// Instantiate each member of the context given the actual parameters specified, and store the |
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175 | /// instantiations for use by the indexer |
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176 | template< typename FormalIterator, typename ActualIterator, typename MemberIterator, typename OutputIterator > |
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177 | void applySubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actual, MemberIterator memberBegin, MemberIterator memberEnd, OutputIterator out ) { |
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178 | TypeSubstitution sub = TypeSubstitution( formalBegin, formalEnd, actual ); |
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179 | for ( auto i = memberBegin; i != memberEnd; ++i ) { |
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180 | sub.apply( *i ); |
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181 | *out++ = *i; |
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182 | } // for |
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183 | } |
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184 | |
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185 | std::ostream & operator<<( std::ostream & out, const TypeSubstitution & sub ); |
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186 | |
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187 | // Local Variables: // |
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188 | // tab-width: 4 // |
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189 | // mode: c++ // |
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190 | // compile-command: "make install" // |
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191 | // End: // |
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