[51b7345] | 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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