1 | // |
---|
2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
---|
3 | // |
---|
4 | // The contents of this file are covered under the licence agreement in the |
---|
5 | // file "LICENCE" distributed with Cforall. |
---|
6 | // |
---|
7 | // TypeSubstitution.h -- |
---|
8 | // |
---|
9 | // Author : Richard C. Bilson |
---|
10 | // Created On : Mon May 18 07:44:20 2015 |
---|
11 | // Last Modified By : Peter A. Buhr |
---|
12 | // Last Modified On : Sat Jul 22 09:52:24 2017 |
---|
13 | // Update Count : 3 |
---|
14 | // |
---|
15 | |
---|
16 | #pragma once |
---|
17 | |
---|
18 | #include <cassert> // for assert |
---|
19 | #include <iosfwd> // for ostream |
---|
20 | #include <list> // for list<>::iterator, _List_iterator |
---|
21 | #include <map> // for _Rb_tree_iterator, map, map<>::val... |
---|
22 | #include <set> // for set |
---|
23 | #include <string> // for string, operator!= |
---|
24 | #include <utility> // for pair |
---|
25 | |
---|
26 | #include "Common/SemanticError.h" // for SemanticError |
---|
27 | #include "SynTree/Declaration.h" // for TypeDecl, Declaration (ptr only) |
---|
28 | #include "SynTree/Expression.h" // for Expression (ptr only), NameExpr (p... |
---|
29 | #include "SynTree/Mutator.h" // for Mutator |
---|
30 | #include "SynTree/Type.h" // for Type, ArrayType (ptr only), BasicT... |
---|
31 | |
---|
32 | class TypeSubstitution : public Mutator { |
---|
33 | typedef Mutator Parent; |
---|
34 | public: |
---|
35 | TypeSubstitution(); |
---|
36 | template< typename FormalIterator, typename ActualIterator > |
---|
37 | TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
---|
38 | TypeSubstitution( const TypeSubstitution &other ); |
---|
39 | virtual ~TypeSubstitution(); |
---|
40 | |
---|
41 | TypeSubstitution &operator=( const TypeSubstitution &other ); |
---|
42 | |
---|
43 | template< typename SynTreeClass > int apply( SynTreeClass *&input ); |
---|
44 | template< typename SynTreeClass > int applyFree( SynTreeClass *&input ); |
---|
45 | |
---|
46 | void add( std::string formalType, Type *actualType ); |
---|
47 | void add( const TypeSubstitution &other ); |
---|
48 | void remove( std::string formalType ); |
---|
49 | Type *lookup( std::string formalType ) const; |
---|
50 | bool empty() const; |
---|
51 | |
---|
52 | template< typename FormalIterator, typename ActualIterator > |
---|
53 | void add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ); |
---|
54 | |
---|
55 | /// this function is unused... |
---|
56 | template< typename TypeInstListIterator > |
---|
57 | void extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ); |
---|
58 | |
---|
59 | void normalize(); |
---|
60 | |
---|
61 | TypeSubstitution * acceptMutator( Mutator & mutator ); |
---|
62 | |
---|
63 | void print( std::ostream &os, int indent = 0 ) const; |
---|
64 | TypeSubstitution *clone() const { return new TypeSubstitution( *this ); } |
---|
65 | private: |
---|
66 | virtual Type* mutate(TypeInstType *aggregateUseType); |
---|
67 | virtual Expression* mutate(NameExpr *nameExpr); |
---|
68 | |
---|
69 | /// Records type variable bindings from forall-statements |
---|
70 | template< typename TypeClass > Type *handleType( TypeClass *type ); |
---|
71 | /// Records type variable bindings from forall-statements and instantiations of generic types |
---|
72 | template< typename TypeClass > Type *handleAggregateType( TypeClass *type ); |
---|
73 | |
---|
74 | virtual Type* mutate(VoidType *basicType); |
---|
75 | virtual Type* mutate(BasicType *basicType); |
---|
76 | virtual Type* mutate(PointerType *pointerType); |
---|
77 | virtual Type* mutate(ArrayType *arrayType); |
---|
78 | virtual Type* mutate(FunctionType *functionType); |
---|
79 | virtual Type* mutate(StructInstType *aggregateUseType); |
---|
80 | virtual Type* mutate(UnionInstType *aggregateUseType); |
---|
81 | virtual Type* mutate(EnumInstType *aggregateUseType); |
---|
82 | virtual Type* mutate(TraitInstType *aggregateUseType); |
---|
83 | virtual Type* mutate(TupleType *tupleType); |
---|
84 | virtual Type* mutate(VarArgsType *varArgsType); |
---|
85 | virtual Type* mutate(ZeroType *zeroType); |
---|
86 | virtual Type* mutate(OneType *oneType); |
---|
87 | |
---|
88 | // TODO: worry about traversing into a forall-qualified function type or type decl with assertions |
---|
89 | |
---|
90 | void initialize( const TypeSubstitution &src, TypeSubstitution &dest ); |
---|
91 | |
---|
92 | typedef std::map< std::string, Type* > TypeEnvType; |
---|
93 | typedef std::map< std::string, Expression* > VarEnvType; |
---|
94 | typedef std::set< std::string > BoundVarsType; |
---|
95 | TypeEnvType typeEnv; |
---|
96 | VarEnvType varEnv; |
---|
97 | BoundVarsType boundVars; |
---|
98 | int subCount; |
---|
99 | bool freeOnly; |
---|
100 | }; |
---|
101 | |
---|
102 | template< typename FormalIterator, typename ActualIterator > |
---|
103 | void TypeSubstitution::add( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) { |
---|
104 | // FormalIterator points to a TypeDecl |
---|
105 | // ActualIterator points to a Type |
---|
106 | FormalIterator formalIt = formalBegin; |
---|
107 | ActualIterator actualIt = actualBegin; |
---|
108 | for ( ; formalIt != formalEnd; ++formalIt, ++actualIt ) { |
---|
109 | if ( TypeDecl *formal = dynamic_cast< TypeDecl* >( *formalIt ) ) { |
---|
110 | if ( TypeExpr *actual = dynamic_cast< TypeExpr* >( *actualIt ) ) { |
---|
111 | if ( formal->get_name() != "" ) { |
---|
112 | TypeEnvType::iterator i = typeEnv.find( formal->get_name() ); |
---|
113 | if ( i != typeEnv.end() ) { |
---|
114 | delete i->second; |
---|
115 | } // if |
---|
116 | typeEnv[ formal->get_name() ] = actual->get_type()->clone(); |
---|
117 | } // if |
---|
118 | } else { |
---|
119 | throw SemanticError( toString( "Attempt to provide non-type parameter: ", toString( *actualIt ).c_str(), " for type parameter " ), formal ); |
---|
120 | } // if |
---|
121 | } else { |
---|
122 | // TODO: type check the formal and actual parameters |
---|
123 | if ( (*formalIt)->get_name() != "" ) { |
---|
124 | varEnv[ (*formalIt)->get_name() ] = (*actualIt)->clone(); |
---|
125 | } // if |
---|
126 | } // if |
---|
127 | } // for |
---|
128 | } |
---|
129 | |
---|
130 | template< typename FormalIterator, typename ActualIterator > |
---|
131 | TypeSubstitution::TypeSubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actualBegin ) |
---|
132 | { |
---|
133 | add( formalBegin, formalEnd, actualBegin ); |
---|
134 | } |
---|
135 | |
---|
136 | template< typename SynTreeClass > |
---|
137 | int TypeSubstitution::apply( SynTreeClass *&input ) { |
---|
138 | assert( input ); |
---|
139 | subCount = 0; |
---|
140 | freeOnly = false; |
---|
141 | input = dynamic_cast< SynTreeClass *>( input->acceptMutator( *this ) ); |
---|
142 | assert( input ); |
---|
143 | /// std::cout << "substitution result is: "; |
---|
144 | /// newType->print( std::cout ); |
---|
145 | /// std::cout << std::endl; |
---|
146 | return subCount; |
---|
147 | } |
---|
148 | |
---|
149 | template< typename SynTreeClass > |
---|
150 | int TypeSubstitution::applyFree( SynTreeClass *&input ) { |
---|
151 | assert( input ); |
---|
152 | subCount = 0; |
---|
153 | freeOnly = true; |
---|
154 | input = dynamic_cast< SynTreeClass *>( input->acceptMutator( *this ) ); |
---|
155 | assert( input ); |
---|
156 | /// std::cout << "substitution result is: "; |
---|
157 | /// newType->print( std::cout ); |
---|
158 | /// std::cout << std::endl; |
---|
159 | return subCount; |
---|
160 | } |
---|
161 | |
---|
162 | template< typename TypeInstListIterator > |
---|
163 | void TypeSubstitution::extract( TypeInstListIterator begin, TypeInstListIterator end, TypeSubstitution &result ) { |
---|
164 | // xxx - this function doesn't extract varEnv - is this intentional? |
---|
165 | while ( begin != end ) { |
---|
166 | TypeEnvType::iterator cur = typeEnv.find( (*begin++)->get_name() ); |
---|
167 | if ( cur != typeEnv.end() ) { |
---|
168 | result.typeEnv[ cur->first ] = cur->second; |
---|
169 | typeEnv.erase( cur ); |
---|
170 | } // if |
---|
171 | } // while |
---|
172 | } |
---|
173 | |
---|
174 | /// Instantiate each member of the context given the actual parameters specified, and store the |
---|
175 | /// instantiations for use by the indexer |
---|
176 | template< typename FormalIterator, typename ActualIterator, typename MemberIterator, typename OutputIterator > |
---|
177 | void applySubstitution( FormalIterator formalBegin, FormalIterator formalEnd, ActualIterator actual, MemberIterator memberBegin, MemberIterator memberEnd, OutputIterator out ) { |
---|
178 | TypeSubstitution sub = TypeSubstitution( formalBegin, formalEnd, actual ); |
---|
179 | for ( auto i = memberBegin; i != memberEnd; ++i ) { |
---|
180 | sub.apply( *i ); |
---|
181 | *out++ = *i; |
---|
182 | } // for |
---|
183 | } |
---|
184 | |
---|
185 | std::ostream & operator<<( std::ostream & out, const TypeSubstitution & sub ); |
---|
186 | |
---|
187 | // Local Variables: // |
---|
188 | // tab-width: 4 // |
---|
189 | // mode: c++ // |
---|
190 | // compile-command: "make install" // |
---|
191 | // End: // |
---|