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: TypeSubstitution.h,v 1.9 2005/08/29 20:59:26 rcbilson Exp $ |
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5 | * |
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6 | */ |
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7 | |
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8 | #ifndef SYNTREE_TYPESUBSTITUTION_H |
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9 | #define SYNTREE_TYPESUBSTITUTION_H |
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10 | |
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11 | #include <map> |
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12 | #include <set> |
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13 | #include <cassert> |
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14 | |
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15 | #include "SynTree/Mutator.h" |
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16 | #include "SynTree/Declaration.h" |
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17 | #include "SynTree/Expression.h" |
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18 | |
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19 | |
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20 | class TypeSubstitution : public Mutator |
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21 | { |
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22 | typedef Mutator Parent; |
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23 | |
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24 | public: |
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25 | TypeSubstitution(); |
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26 | template< typename FormalIterator, typename ActualIterator > |
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27 | TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
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28 | TypeSubstitution( const TypeSubstitution &other ); |
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29 | virtual ~TypeSubstitution(); |
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30 | |
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31 | TypeSubstitution &operator=( const TypeSubstitution &other ); |
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32 | |
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33 | template< typename SynTreeClass > int apply( SynTreeClass *&input ); |
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34 | template< typename SynTreeClass > int applyFree( SynTreeClass *&input ); |
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35 | |
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36 | void add( std::string formalType, Type *actualType ); |
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37 | void add( const TypeSubstitution &other ); |
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38 | void remove( std::string formalType ); |
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39 | Type *lookup( std::string formalType ) const; |
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40 | bool empty() const; |
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41 | |
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42 | template< typename FormalIterator, typename ActualIterator > |
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43 | void add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
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44 | |
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45 | template< typename TypeInstListIterator > |
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46 | void extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ); |
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47 | |
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48 | void normalize(); |
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49 | |
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50 | void print( std::ostream &os, int indent = 0 ) const; |
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51 | TypeSubstitution *clone() const { return new TypeSubstitution( *this ); } |
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52 | |
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53 | private: |
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54 | virtual Type* mutate(TypeInstType *aggregateUseType); |
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55 | virtual Expression* mutate(NameExpr *nameExpr); |
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56 | |
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57 | template< typename TypeClass > Type *handleType( TypeClass *type ); |
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58 | |
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59 | virtual Type* mutate(VoidType *basicType); |
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60 | virtual Type* mutate(BasicType *basicType); |
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61 | virtual Type* mutate(PointerType *pointerType); |
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62 | virtual Type* mutate(ArrayType *arrayType); |
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63 | virtual Type* mutate(FunctionType *functionType); |
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64 | virtual Type* mutate(StructInstType *aggregateUseType); |
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65 | virtual Type* mutate(UnionInstType *aggregateUseType); |
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66 | virtual Type* mutate(EnumInstType *aggregateUseType); |
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67 | virtual Type* mutate(ContextInstType *aggregateUseType); |
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68 | virtual Type* mutate(TupleType *tupleType); |
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69 | |
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70 | // TODO: worry about traversing into a forall-qualified function type or type decl with assertions |
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71 | |
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72 | void initialize( const TypeSubstitution &src, TypeSubstitution &dest ); |
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73 | |
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74 | typedef std::map< std::string, Type* > TypeEnvType; |
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75 | typedef std::map< std::string, Expression* > VarEnvType; |
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76 | typedef std::set< std::string > BoundVarsType; |
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77 | TypeEnvType typeEnv; |
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78 | VarEnvType varEnv; |
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79 | BoundVarsType boundVars; |
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80 | int subCount; |
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81 | bool freeOnly; |
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82 | }; |
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83 | |
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84 | template< typename FormalIterator, typename ActualIterator > |
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85 | void |
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86 | TypeSubstitution::add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) |
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87 | { |
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88 | // FormalIterator points to a TypeDecl |
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89 | // ActualIterator points to a Type |
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90 | FormalIterator formalIt = formalBegin; |
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91 | ActualIterator actualIt = actualBegin; |
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92 | for ( ; formalIt != formalEnd; ++formalIt, ++actualIt ) { |
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93 | if ( TypeDecl *formal = dynamic_cast< TypeDecl* >( *formalIt ) ) { |
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94 | if ( TypeExpr *actual = dynamic_cast< TypeExpr* >( *actualIt ) ) { |
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95 | if ( formal->get_name() != "" ) { |
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96 | TypeEnvType::iterator i = typeEnv.find( formal->get_name() ); |
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97 | if ( i != typeEnv.end() ) { |
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98 | delete i->second; |
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99 | } |
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100 | typeEnv[ formal->get_name() ] = actual->get_type()->clone(); |
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101 | } |
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102 | } else { |
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103 | throw SemanticError( "Attempt to provide non-type parameter for type parameter", formal ); |
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104 | } |
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105 | } else { |
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106 | // TODO: type check the formal and actual parameters |
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107 | if ( (*formalIt)->get_name() != "" ) { |
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108 | varEnv[ (*formalIt)->get_name() ] = (*actualIt)->clone(); |
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109 | } |
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110 | } |
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111 | } |
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112 | } |
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113 | |
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114 | template< typename FormalIterator, typename ActualIterator > |
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115 | TypeSubstitution::TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) |
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116 | { |
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117 | add( formalBegin, formalEnd, actualBegin ); |
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118 | } |
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119 | |
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120 | template< typename SynTreeClass > |
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121 | int |
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122 | TypeSubstitution::apply( SynTreeClass *&input ) |
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123 | { |
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124 | assert( input ); |
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125 | subCount = 0; |
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126 | freeOnly = false; |
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127 | input = dynamic_cast< SynTreeClass *>( input->acceptMutator( *this ) ); |
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128 | assert( input ); |
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129 | /// std::cout << "substitution result is: "; |
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130 | /// newType->print( std::cout ); |
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131 | /// std::cout << std::endl; |
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132 | return subCount; |
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133 | } |
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134 | |
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135 | template< typename SynTreeClass > |
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136 | int |
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137 | TypeSubstitution::applyFree( SynTreeClass *&input ) |
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138 | { |
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139 | assert( input ); |
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140 | subCount = 0; |
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141 | freeOnly = true; |
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142 | input = dynamic_cast< SynTreeClass *>( input->acceptMutator( *this ) ); |
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143 | assert( input ); |
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144 | /// std::cout << "substitution result is: "; |
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145 | /// newType->print( std::cout ); |
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146 | /// std::cout << std::endl; |
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147 | return subCount; |
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148 | } |
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149 | |
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150 | template< typename TypeInstListIterator > |
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151 | void |
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152 | TypeSubstitution::extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ) |
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153 | { |
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154 | while ( begin != end ) { |
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155 | TypeEnvType::iterator cur = typeEnv.find( (*begin++)->get_name() ); |
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156 | if ( cur != typeEnv.end() ) { |
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157 | result.typeEnv[ cur->first ] = cur->second; |
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158 | typeEnv.erase( cur ); |
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159 | } |
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160 | } |
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161 | } |
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162 | |
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163 | // helper function |
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164 | template< typename FormalIterator, typename ActualIterator, typename MemberIterator, typename OutputIterator > |
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165 | void |
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166 | applySubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actual, MemberIterator memberBegin, MemberIterator memberEnd, OutputIterator out ) |
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167 | { |
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168 | // Instantiate each member of the context given the actual parameters specified, and store the |
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169 | // instantiations for use by the indexer |
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170 | |
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171 | TypeSubstitution sub = TypeSubstitution( formalBegin, formalEnd, actual ); |
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172 | for ( std::list< Declaration* >::iterator i = memberBegin; i != memberEnd; ++i ) { |
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173 | Declaration *newdecl = (*i)->clone(); |
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174 | sub.apply( newdecl ); |
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175 | *out++ = newdecl; |
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176 | } |
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177 | } |
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178 | |
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179 | |
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180 | #endif /* #ifndef SYNTREE_TYPESUBSTITUTION_H */ |
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