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 : Tue Apr 30 22:52:47 2019 |
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13 | // Update Count : 9 |
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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 <list> // for list<>::iterator, _List_iterator |
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20 | #include <unordered_map> |
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21 | #include <unordered_set> |
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22 | #include <string> // for string, operator!= |
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23 | #include <utility> // for pair |
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24 | |
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25 | #include "Fwd.hpp" // for UniqueId |
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26 | #include "ParseNode.hpp" |
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27 | #include "Type.hpp" |
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28 | #include "Common/SemanticError.h" // for SemanticError |
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29 | #include "Visitor.hpp" |
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30 | #include "Decl.hpp" |
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31 | #include "Expr.hpp" |
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32 | #include "Node.hpp" |
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33 | |
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34 | namespace ast { |
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35 | |
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36 | class TypeSubstitution : public Node { |
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37 | public: |
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38 | TypeSubstitution(); |
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39 | template< typename FormalIterator, typename ActualIterator > |
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40 | TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
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41 | TypeSubstitution( const TypeSubstitution &other ); |
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42 | virtual ~TypeSubstitution(); |
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43 | |
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44 | TypeSubstitution &operator=( const TypeSubstitution &other ); |
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45 | |
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46 | template< typename SynTreeClass > |
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47 | struct ApplyResult { |
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48 | const SynTreeClass * node; |
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49 | int count; |
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50 | }; |
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51 | |
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52 | template< typename SynTreeClass > ApplyResult<SynTreeClass> apply( const SynTreeClass * input ) const; |
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53 | template< typename SynTreeClass > ApplyResult<SynTreeClass> applyFree( const SynTreeClass * input ) const; |
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54 | |
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55 | template< typename node_t, enum Node::ref_type ref_t > |
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56 | int apply( ptr_base< node_t, ref_t > & input ) const { |
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57 | const node_t * p = input.get(); |
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58 | auto ret = apply(p); |
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59 | input = ret.node; |
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60 | return ret.count; |
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61 | } |
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62 | |
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63 | template< typename node_t, enum Node::ref_type ref_t > |
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64 | int applyFree( ptr_base< node_t, ref_t > & input ) const { |
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65 | const node_t * p = input.get(); |
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66 | auto ret = applyFree(p); |
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67 | input = ret.node; |
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68 | return ret.count; |
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69 | } |
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70 | |
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71 | void add( std::string formalType, const Type *actualType ); |
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72 | void add( const TypeSubstitution &other ); |
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73 | void remove( std::string formalType ); |
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74 | const Type *lookup( std::string formalType ) const; |
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75 | bool empty() const; |
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76 | |
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77 | void addVar( std::string formalExpr, const Expr *actualExpr ); |
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78 | |
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79 | template< typename FormalIterator, typename ActualIterator > |
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80 | void add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
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81 | |
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82 | /// create a new TypeSubstitution using bindings from env containing all of the type variables in expr |
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83 | static TypeSubstitution * newFromExpr( const Expr * expr, const TypeSubstitution * env ); |
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84 | |
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85 | void normalize(); |
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86 | |
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87 | const TypeSubstitution * accept( Visitor & v ) const override { return v.visit( this ); } |
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88 | |
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89 | TypeSubstitution * clone() const override { return new TypeSubstitution( *this ); } |
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90 | |
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91 | private: |
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92 | |
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93 | // Mutator that performs the substitution |
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94 | struct Substituter; |
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95 | |
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96 | // TODO: worry about traversing into a forall-qualified function type or type decl with assertions |
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97 | |
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98 | void initialize( const TypeSubstitution &src, TypeSubstitution &dest ); |
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99 | |
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100 | template<typename pass_type> |
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101 | friend class Pass; |
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102 | |
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103 | typedef std::unordered_map< std::string, ptr<Type> > TypeEnvType; |
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104 | typedef std::unordered_map< std::string, ptr<Expr> > VarEnvType; |
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105 | TypeEnvType typeEnv; |
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106 | VarEnvType varEnv; |
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107 | |
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108 | public: |
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109 | // has to come after declaration of typeEnv |
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110 | auto begin() -> decltype( typeEnv.begin() ) { return typeEnv.begin(); } |
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111 | auto end() -> decltype( typeEnv. end() ) { return typeEnv. end(); } |
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112 | auto begin() const -> decltype( typeEnv.begin() ) { return typeEnv.begin(); } |
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113 | auto end() const -> decltype( typeEnv. end() ) { return typeEnv. end(); } |
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114 | |
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115 | auto beginVar() -> decltype( varEnv.begin() ) { return varEnv.begin(); } |
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116 | auto endVar() -> decltype( varEnv. end() ) { return varEnv. end(); } |
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117 | auto beginVar() const -> decltype( varEnv.begin() ) { return varEnv.begin(); } |
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118 | auto endVar() const -> decltype( varEnv. end() ) { return varEnv. end(); } |
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119 | }; |
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120 | |
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121 | template< typename FormalIterator, typename ActualIterator > |
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122 | void TypeSubstitution::add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) { |
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123 | // FormalIterator points to a TypeDecl |
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124 | // ActualIterator points to a Type |
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125 | FormalIterator formalIt = formalBegin; |
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126 | ActualIterator actualIt = actualBegin; |
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127 | for ( ; formalIt != formalEnd; ++formalIt, ++actualIt ) { |
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128 | if ( const TypeDecl *formal = formalIt->template as<TypeDecl>() ) { |
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129 | if ( const TypeExpr *actual = actualIt->template as<TypeExpr>() ) { |
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130 | if ( formal->name != "" ) { |
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131 | typeEnv[ formal->name ] = actual->type; |
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132 | } // if |
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133 | } else { |
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134 | SemanticError( formal, toString( "Attempt to provide non-type parameter: ", toString( *actualIt ).c_str(), " for type parameter " ) ); |
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135 | } // if |
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136 | } else { |
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137 | // TODO: type check the formal and actual parameters |
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138 | if ( (*formalIt)->name != "" ) { |
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139 | varEnv[ (*formalIt)->name ] = *actualIt; |
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140 | } // if |
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141 | } // if |
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142 | } // for |
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143 | } |
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144 | |
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145 | template< typename FormalIterator, typename ActualIterator > |
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146 | TypeSubstitution::TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) { |
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147 | add( formalBegin, formalEnd, actualBegin ); |
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148 | } |
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149 | |
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150 | } // namespace ast |
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151 | |
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152 | // include needs to happen after TypeSubstitution is defined so that both TypeSubstitution and |
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153 | // PassVisitor are defined before PassVisitor implementation accesses TypeSubstitution internals. |
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154 | #include "Pass.hpp" |
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155 | #include "Copy.hpp" |
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156 | |
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157 | namespace ast { |
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158 | |
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159 | // definitition must happen after PassVisitor is included so that WithGuards can be used |
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160 | struct TypeSubstitution::Substituter : public WithGuards, public WithVisitorRef<Substituter> { |
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161 | |
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162 | Substituter( const TypeSubstitution & sub, bool freeOnly ) : sub( sub ), freeOnly( freeOnly ) {} |
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163 | |
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164 | const Type * postvisit( const TypeInstType * aggregateUseType ); |
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165 | const Expr * postvisit( const NameExpr * nameExpr ); |
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166 | |
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167 | /// Records type variable bindings from forall-statements |
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168 | void previsit( const ParameterizedType * type ); |
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169 | /// Records type variable bindings from forall-statements and instantiations of generic types |
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170 | void handleAggregateType( const ReferenceToType * type ); |
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171 | |
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172 | void previsit( const StructInstType * aggregateUseType ); |
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173 | void previsit( const UnionInstType * aggregateUseType ); |
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174 | |
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175 | const TypeSubstitution & sub; |
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176 | int subCount = 0; |
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177 | bool freeOnly; |
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178 | typedef std::unordered_set< std::string > BoundVarsType; |
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179 | BoundVarsType boundVars; |
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180 | |
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181 | }; |
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182 | |
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183 | template< typename SynTreeClass > |
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184 | TypeSubstitution::ApplyResult<SynTreeClass> TypeSubstitution::apply( const SynTreeClass * input ) const { |
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185 | assert( input ); |
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186 | Pass<Substituter> sub( *this, false ); |
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187 | input = strict_dynamic_cast< const SynTreeClass * >( deepCopy(input)->accept( sub ) ); |
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188 | return { input, sub.pass.subCount }; |
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189 | } |
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190 | |
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191 | template< typename SynTreeClass > |
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192 | TypeSubstitution::ApplyResult<SynTreeClass> TypeSubstitution::applyFree( const SynTreeClass * input ) const { |
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193 | assert( input ); |
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194 | Pass<Substituter> sub( *this, true ); |
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195 | input = strict_dynamic_cast< const SynTreeClass * >( input->accept( sub ) ); |
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196 | return { input, sub.pass.subCount }; |
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197 | } |
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198 | |
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199 | } // namespace ast |
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200 | |
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201 | // Local Variables: // |
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202 | // tab-width: 4 // |
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203 | // mode: c++ // |
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204 | // compile-command: "make install" // |
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205 | // End: // |
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