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 | // PtrsCastable.cc -- |
---|
8 | // |
---|
9 | // Author : Richard C. Bilson |
---|
10 | // Created On : Sun May 17 11:48:00 2015 |
---|
11 | // Last Modified By : Peter A. Buhr |
---|
12 | // Last Modified On : Wed Dec 11 21:48:33 2019 |
---|
13 | // Update Count : 9 |
---|
14 | // |
---|
15 | |
---|
16 | #include "PtrsCastable.hpp" |
---|
17 | |
---|
18 | #include "AST/Decl.hpp" |
---|
19 | #include "AST/Pass.hpp" |
---|
20 | #include "AST/Type.hpp" |
---|
21 | #include "AST/TypeEnvironment.hpp" |
---|
22 | #include "Common/PassVisitor.h" |
---|
23 | #include "ResolvExpr/PtrsAssignable.hpp" // for ptrsAssignable |
---|
24 | #include "ResolvExpr/TypeEnvironment.h" // for EqvClass, TypeEnvironment |
---|
25 | #include "SymTab/Indexer.h" // for Indexer |
---|
26 | #include "SynTree/Declaration.h" // for TypeDecl, TypeDecl::Kind::Ftype |
---|
27 | #include "SynTree/Type.h" // for TypeInstType, Type, BasicType |
---|
28 | #include "SynTree/Visitor.h" // for Visitor |
---|
29 | |
---|
30 | namespace ResolvExpr { |
---|
31 | struct PtrsCastable_old : public WithShortCircuiting { |
---|
32 | public: |
---|
33 | PtrsCastable_old( const Type * dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ); |
---|
34 | |
---|
35 | int get_result() const { return result; } |
---|
36 | |
---|
37 | void previsit( const Type * ) { visit_children = false; } |
---|
38 | |
---|
39 | void postvisit( const VoidType * voidType ); |
---|
40 | void postvisit( const BasicType * basicType ); |
---|
41 | void postvisit( const PointerType * pointerType ); |
---|
42 | void postvisit( const ArrayType * arrayType ); |
---|
43 | void postvisit( const FunctionType * functionType ); |
---|
44 | void postvisit( const StructInstType * inst ); |
---|
45 | void postvisit( const UnionInstType * inst ); |
---|
46 | void postvisit( const EnumInstType * inst ); |
---|
47 | void postvisit( const TraitInstType * inst ); |
---|
48 | void postvisit( const TypeInstType * inst ); |
---|
49 | void postvisit( const TupleType * tupleType ); |
---|
50 | void postvisit( const VarArgsType * varArgsType ); |
---|
51 | void postvisit( const ZeroType * zeroType ); |
---|
52 | void postvisit( const OneType * oneType ); |
---|
53 | private: |
---|
54 | const Type * dest; |
---|
55 | int result; |
---|
56 | const TypeEnvironment &env; |
---|
57 | const SymTab::Indexer &indexer; |
---|
58 | }; |
---|
59 | |
---|
60 | namespace { |
---|
61 | int objectCast( const Type * src, const TypeEnvironment &env, const SymTab::Indexer &indexer ) { |
---|
62 | if ( dynamic_cast< const FunctionType* >( src ) ) { |
---|
63 | return -1; |
---|
64 | } else if ( const TypeInstType * typeInst = dynamic_cast< const TypeInstType* >( src ) ) { |
---|
65 | if ( const NamedTypeDecl * ntDecl = indexer.lookupType( typeInst->name ) ) { |
---|
66 | if ( const TypeDecl * tyDecl = dynamic_cast< const TypeDecl* >( ntDecl ) ) { |
---|
67 | if ( tyDecl->kind == TypeDecl::Ftype ) { |
---|
68 | return -1; |
---|
69 | } // if |
---|
70 | } //if |
---|
71 | } else if ( const EqvClass * eqvClass = env.lookup( typeInst->get_name() ) ) { |
---|
72 | if ( eqvClass->data.kind == TypeDecl::Ftype ) { |
---|
73 | return -1; |
---|
74 | } // if |
---|
75 | } // if |
---|
76 | } //if |
---|
77 | return 1; |
---|
78 | } |
---|
79 | int functionCast( const Type * src, const TypeEnvironment &env, const SymTab::Indexer &indexer ) { |
---|
80 | return -1 * objectCast( src, env, indexer ); // reverse the sense of objectCast |
---|
81 | } |
---|
82 | } |
---|
83 | |
---|
84 | int ptrsCastable( const Type * src, const Type * dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ) { |
---|
85 | if ( const TypeInstType * destAsTypeInst = dynamic_cast< const TypeInstType* >( dest ) ) { |
---|
86 | if ( const EqvClass * eqvClass = env.lookup( destAsTypeInst->get_name() ) ) { |
---|
87 | // xxx - should this be ptrsCastable? |
---|
88 | return ptrsAssignable( src, eqvClass->type, env ); |
---|
89 | } // if |
---|
90 | } // if |
---|
91 | if ( dynamic_cast< const VoidType* >( dest ) ) { |
---|
92 | return objectCast( src, env, indexer ); |
---|
93 | } else { |
---|
94 | PassVisitor<PtrsCastable_old> ptrs( dest, env, indexer ); |
---|
95 | src->accept( ptrs ); |
---|
96 | return ptrs.pass.get_result(); |
---|
97 | } // if |
---|
98 | } |
---|
99 | |
---|
100 | PtrsCastable_old::PtrsCastable_old( const Type * dest, const TypeEnvironment &env, const SymTab::Indexer &indexer ) |
---|
101 | : dest( dest ), result( 0 ), env( env ), indexer( indexer ) { |
---|
102 | } |
---|
103 | |
---|
104 | void PtrsCastable_old::postvisit( const VoidType * ) { |
---|
105 | result = objectCast( dest, env, indexer ); |
---|
106 | } |
---|
107 | |
---|
108 | void PtrsCastable_old::postvisit( const BasicType * ) { |
---|
109 | result = objectCast( dest, env, indexer ); |
---|
110 | } |
---|
111 | |
---|
112 | void PtrsCastable_old::postvisit( const PointerType * ) { |
---|
113 | result = objectCast( dest, env, indexer ); |
---|
114 | } |
---|
115 | |
---|
116 | void PtrsCastable_old::postvisit( const ArrayType * ) { |
---|
117 | result = objectCast( dest, env, indexer ); |
---|
118 | } |
---|
119 | |
---|
120 | void PtrsCastable_old::postvisit( const FunctionType * ) { |
---|
121 | // result = -1; |
---|
122 | result = functionCast( dest, env, indexer ); |
---|
123 | } |
---|
124 | |
---|
125 | void PtrsCastable_old::postvisit( const StructInstType * ) { |
---|
126 | result = objectCast( dest, env, indexer ); |
---|
127 | } |
---|
128 | |
---|
129 | void PtrsCastable_old::postvisit( const UnionInstType * ) { |
---|
130 | result = objectCast( dest, env, indexer ); |
---|
131 | } |
---|
132 | |
---|
133 | void PtrsCastable_old::postvisit( const EnumInstType * ) { |
---|
134 | if ( dynamic_cast< const EnumInstType * >( dest ) ) { |
---|
135 | result = 1; |
---|
136 | } else if ( const BasicType * bt = dynamic_cast< const BasicType * >( dest ) ) { |
---|
137 | if ( bt->kind == BasicType::SignedInt ) { |
---|
138 | result = 0; |
---|
139 | } else { |
---|
140 | result = 1; |
---|
141 | } |
---|
142 | } else { |
---|
143 | result = objectCast( dest, env, indexer ); |
---|
144 | } |
---|
145 | } |
---|
146 | |
---|
147 | void PtrsCastable_old::postvisit( const TraitInstType * ) {} |
---|
148 | |
---|
149 | void PtrsCastable_old::postvisit( const TypeInstType *inst ) { |
---|
150 | //result = objectCast( inst, env, indexer ) > 0 && objectCast( dest, env, indexer ) > 0 ? 1 : -1; |
---|
151 | result = objectCast( inst, env, indexer ) == objectCast( dest, env, indexer ) ? 1 : -1; |
---|
152 | } |
---|
153 | |
---|
154 | void PtrsCastable_old::postvisit( const TupleType * ) { |
---|
155 | result = objectCast( dest, env, indexer ); |
---|
156 | } |
---|
157 | |
---|
158 | void PtrsCastable_old::postvisit( const VarArgsType * ) { |
---|
159 | result = objectCast( dest, env, indexer ); |
---|
160 | } |
---|
161 | |
---|
162 | void PtrsCastable_old::postvisit( const ZeroType * ) { |
---|
163 | result = objectCast( dest, env, indexer ); |
---|
164 | } |
---|
165 | |
---|
166 | void PtrsCastable_old::postvisit( const OneType * ) { |
---|
167 | result = objectCast( dest, env, indexer ); |
---|
168 | } |
---|
169 | |
---|
170 | namespace { |
---|
171 | // can this type be cast to an object (1 for yes, -1 for no) |
---|
172 | int objectCast( |
---|
173 | const ast::Type * src, const ast::TypeEnvironment & env, const ast::SymbolTable & symtab |
---|
174 | ) { |
---|
175 | if ( dynamic_cast< const ast::FunctionType * >( src ) ) { |
---|
176 | return -1; |
---|
177 | } else if ( auto inst = dynamic_cast< const ast::TypeInstType * >( src ) ) { |
---|
178 | if ( const ast::NamedTypeDecl * named = symtab.lookupType( inst->name ) ) { |
---|
179 | if ( auto tyDecl = dynamic_cast< const ast::TypeDecl * >( named ) ) { |
---|
180 | if ( tyDecl->kind == ast::TypeDecl::Ftype ) { |
---|
181 | return -1; |
---|
182 | } |
---|
183 | } |
---|
184 | } else if ( const ast::EqvClass * eqvClass = env.lookup( *inst ) ) { |
---|
185 | if ( eqvClass->data.kind == ast::TypeDecl::Ftype ) { |
---|
186 | return -1; |
---|
187 | } |
---|
188 | } |
---|
189 | } |
---|
190 | |
---|
191 | return 1; |
---|
192 | } |
---|
193 | |
---|
194 | // can this type be cast to a function (inverse of objectCast) |
---|
195 | int functionCast( |
---|
196 | const ast::Type * src, const ast::TypeEnvironment & env, const ast::SymbolTable & symtab |
---|
197 | ) { |
---|
198 | return -1 * objectCast( src, env, symtab ); |
---|
199 | } |
---|
200 | |
---|
201 | class PtrsCastable_new : public ast::WithShortCircuiting { |
---|
202 | const ast::Type * dst; |
---|
203 | const ast::TypeEnvironment & env; |
---|
204 | const ast::SymbolTable & symtab; |
---|
205 | public: |
---|
206 | int result; |
---|
207 | |
---|
208 | PtrsCastable_new( |
---|
209 | const ast::Type * d, const ast::TypeEnvironment & e, const ast::SymbolTable & syms ) |
---|
210 | : dst( d ), env( e ), symtab( syms ), result( 0 ) {} |
---|
211 | |
---|
212 | void previsit( const ast::Type * ) { visit_children = false; } |
---|
213 | |
---|
214 | void postvisit( const ast::VoidType * ) { |
---|
215 | result = objectCast( dst, env, symtab ); |
---|
216 | } |
---|
217 | |
---|
218 | void postvisit( const ast::BasicType * ) { |
---|
219 | result = objectCast( dst, env, symtab ); |
---|
220 | } |
---|
221 | |
---|
222 | void postvisit( const ast::PointerType * ) { |
---|
223 | result = objectCast( dst, env, symtab ); |
---|
224 | } |
---|
225 | |
---|
226 | void postvisit( const ast::ArrayType * ) { |
---|
227 | result = objectCast( dst, env, symtab ); |
---|
228 | } |
---|
229 | |
---|
230 | void postvisit( const ast::FunctionType * ) { |
---|
231 | result = functionCast( dst, env, symtab ); |
---|
232 | } |
---|
233 | |
---|
234 | void postvisit( const ast::StructInstType * ) { |
---|
235 | result = objectCast( dst, env, symtab ); |
---|
236 | } |
---|
237 | |
---|
238 | void postvisit( const ast::UnionInstType * ) { |
---|
239 | result = objectCast( dst, env, symtab ); |
---|
240 | } |
---|
241 | |
---|
242 | void postvisit( const ast::EnumInstType * ) { |
---|
243 | if ( dynamic_cast< const ast::EnumInstType * >( dst ) ) { |
---|
244 | result = 1; |
---|
245 | } else if ( auto bt = dynamic_cast< const ast::BasicType * >( dst ) ) { |
---|
246 | if ( bt->kind == ast::BasicType::SignedInt ) { |
---|
247 | result = 0; |
---|
248 | } else { |
---|
249 | result = 1; |
---|
250 | } |
---|
251 | } else { |
---|
252 | result = objectCast( dst, env, symtab ); |
---|
253 | } |
---|
254 | } |
---|
255 | |
---|
256 | void postvisit( const ast::TraitInstType * ) {} |
---|
257 | |
---|
258 | void postvisit( const ast::TypeInstType * inst ) { |
---|
259 | // check trait and destination type are both object or both function |
---|
260 | result = objectCast( inst, env, symtab ) == objectCast( dst, env, symtab ) ? 1 : -1; |
---|
261 | } |
---|
262 | |
---|
263 | void postvisit( const ast::TupleType * ) { |
---|
264 | result = objectCast( dst, env, symtab ); |
---|
265 | } |
---|
266 | |
---|
267 | void postvisit( const ast::VarArgsType * ) { |
---|
268 | result = objectCast( dst, env, symtab ); |
---|
269 | } |
---|
270 | |
---|
271 | void postvisit( const ast::ZeroType * ) { |
---|
272 | result = objectCast( dst, env, symtab ); |
---|
273 | } |
---|
274 | |
---|
275 | void postvisit( const ast::OneType * ) { |
---|
276 | result = objectCast( dst, env, symtab ); |
---|
277 | } |
---|
278 | |
---|
279 | }; |
---|
280 | } // anonymous namespace |
---|
281 | |
---|
282 | int ptrsCastable( |
---|
283 | const ast::Type * src, const ast::Type * dst, const ast::SymbolTable & symtab, |
---|
284 | const ast::TypeEnvironment & env |
---|
285 | ) { |
---|
286 | if ( auto inst = dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
---|
287 | if ( const ast::EqvClass * eqvClass = env.lookup( *inst ) ) { |
---|
288 | return ptrsAssignable( src, eqvClass->bound, env ); |
---|
289 | } |
---|
290 | } |
---|
291 | |
---|
292 | if ( dynamic_cast< const ast::VoidType * >( dst ) ) { |
---|
293 | return objectCast( src, env, symtab ); |
---|
294 | } else { |
---|
295 | return ast::Pass<PtrsCastable_new>::read( src, dst, env, symtab ); |
---|
296 | } |
---|
297 | } |
---|
298 | |
---|
299 | } // namespace ResolvExpr |
---|
300 | |
---|
301 | // Local Variables: // |
---|
302 | // tab-width: 4 // |
---|
303 | // mode: c++ // |
---|
304 | // compile-command: "make install" // |
---|
305 | // End: // |
---|