source: src/GenPoly/GenPoly.cc@ f5ec35a

Last change on this file since f5ec35a was c6b4432, checked in by Andrew Beach <ajbeach@…>, 23 months ago

Remove BaseSyntaxNode and clean-up.
  • Property mode set to 100644
File size: 14.5 KB
Line 
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// GenPoly.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Mon May 18 07:44:20 2015
11// Last Modified By : Andrew Beach
12// Last Modified On : Mon Oct 24 15:19:00 2022
13// Update Count : 17
14//
15
16#include "GenPoly.h"
17
18#include <cassert> // for assertf, assert
19#include <iostream> // for operator<<, ostream, basic_os...
20#include <iterator> // for back_insert_iterator, back_in...
21#include <list> // for list, _List_iterator, list<>:...
22#include <typeindex> // for type_index
23#include <utility> // for pair
24#include <vector> // for vector
25
26#include "AST/Expr.hpp"
27#include "AST/Type.hpp"
28#include "AST/TypeSubstitution.hpp"
29#include "GenPoly/ErasableScopedMap.h" // for ErasableScopedMap<>::const_it...
30#include "ResolvExpr/typeops.h" // for flatten
31
32using namespace std;
33
34namespace GenPoly {
35 namespace {
36 /// Checks a parameter list for polymorphic parameters; will substitute according to env if present
37 bool hasPolyParams( const std::vector<ast::ptr<ast::Expr>> & params, const ast::TypeSubstitution * env ) {
38 for ( auto &param : params ) {
39 auto paramType = param.as<ast::TypeExpr>();
40 assertf( paramType, "Aggregate parameters should be type expressions" );
41 if ( isPolyType( paramType->type, env ) ) return true;
42 }
43 return false;
44 }
45
46 /// Checks a parameter list for polymorphic parameters from tyVars; will substitute according to env if present
47 bool hasPolyParams( const std::vector<ast::ptr<ast::Expr>> & params, const TypeVarMap & typeVars, const ast::TypeSubstitution * env ) {
48 for ( auto & param : params ) {
49 auto paramType = param.as<ast::TypeExpr>();
50 assertf( paramType, "Aggregate parameters should be type expressions" );
51 if ( isPolyType( paramType->type, typeVars, env ) ) return true;
52 }
53 return false;
54 }
55
56 /// Checks a parameter list for dynamic-layout parameters from tyVars; will substitute according to env if present
57 bool hasDynParams(
58 const std::vector<ast::ptr<ast::Expr>> & params,
59 const TypeVarMap & typeVars,
60 const ast::TypeSubstitution * subst ) {
61 for ( ast::ptr<ast::Expr> const & paramExpr : params ) {
62 auto param = paramExpr.as<ast::TypeExpr>();
63 assertf( param, "Aggregate parameters should be type expressions." );
64 if ( isDynType( param->type.get(), typeVars, subst ) ) {
65 return true;
66 }
67 }
68 return false;
69 }
70 }
71
72 const ast::Type * replaceTypeInst(const ast::Type * type, const ast::TypeSubstitution * env) {
73 if (!env) return type;
74 if ( auto typeInst = dynamic_cast<const ast::TypeInstType*>(type) ) {
75 auto newType = env->lookup(typeInst);
76 if (newType) return newType;
77 }
78 return type;
79 }
80
81 const ast::Type * isPolyType(const ast::Type * type, const ast::TypeSubstitution * env) {
82 type = replaceTypeInst( type, env );
83
84 if ( dynamic_cast< const ast::TypeInstType * >( type ) ) {
85 return type;
86 } else if ( auto arrayType = dynamic_cast< const ast::ArrayType * >( type ) ) {
87 return isPolyType( arrayType->base, env );
88 } else if ( auto structType = dynamic_cast< const ast::StructInstType* >( type ) ) {
89 if ( hasPolyParams( structType->params, env ) ) return type;
90 } else if ( auto unionType = dynamic_cast< const ast::UnionInstType* >( type ) ) {
91 if ( hasPolyParams( unionType->params, env ) ) return type;
92 }
93 return 0;
94 }
95
96const ast::Type * isPolyType( const ast::Type * type,
97 const TypeVarMap & typeVars, const ast::TypeSubstitution * subst ) {
98 type = replaceTypeInst( type, subst );
99
100 if ( auto inst = dynamic_cast< const ast::TypeInstType * >( type ) ) {
101 if ( typeVars.contains( *inst ) ) return type;
102 } else if ( auto array = dynamic_cast< const ast::ArrayType * >( type ) ) {
103 return isPolyType( array->base, typeVars, subst );
104 } else if ( auto sue = dynamic_cast< const ast::StructInstType * >( type ) ) {
105 if ( hasPolyParams( sue->params, typeVars, subst ) ) return type;
106 } else if ( auto sue = dynamic_cast< const ast::UnionInstType * >( type ) ) {
107 if ( hasPolyParams( sue->params, typeVars, subst ) ) return type;
108 }
109 return nullptr;
110}
111
112const ast::BaseInstType * isDynType(
113 const ast::Type * type, const TypeVarMap & typeVars,
114 const ast::TypeSubstitution * subst ) {
115 type = replaceTypeInst( type, subst );
116
117 if ( auto inst = dynamic_cast<ast::TypeInstType const *>( type ) ) {
118 auto var = typeVars.find( *inst );
119 if ( var != typeVars.end() && var->second.isComplete ) {
120 return inst;
121 }
122 } else if ( auto inst = dynamic_cast<ast::StructInstType const *>( type ) ) {
123 if ( hasDynParams( inst->params, typeVars, subst ) ) {
124 return inst;
125 }
126 } else if ( auto inst = dynamic_cast<ast::UnionInstType const *>( type ) ) {
127 if ( hasDynParams( inst->params, typeVars, subst ) ) {
128 return inst;
129 }
130 }
131 return nullptr;
132}
133
134const ast::BaseInstType *isDynRet(
135 const ast::FunctionType * type, const TypeVarMap & typeVars ) {
136 if ( type->returns.empty() ) return nullptr;
137
138 return isDynType( type->returns.front(), typeVars );
139}
140
141const ast::BaseInstType *isDynRet( const ast::FunctionType * func ) {
142 if ( func->returns.empty() ) return nullptr;
143
144 TypeVarMap forallTypes;
145 makeTypeVarMap( func, forallTypes );
146 return isDynType( func->returns.front(), forallTypes );
147}
148
149bool needsAdapter(
150 ast::FunctionType const * adaptee, const TypeVarMap & typeVars ) {
151 if ( isDynRet( adaptee, typeVars ) ) return true;
152
153 for ( auto param : adaptee->params ) {
154 if ( isDynType( param, typeVars ) ) {
155 return true;
156 }
157 }
158 return false;
159}
160
161const ast::Type * isPolyPtr(
162 const ast::Type * type, const TypeVarMap & typeVars,
163 const ast::TypeSubstitution * typeSubs ) {
164 type = replaceTypeInst( type, typeSubs );
165
166 if ( auto * ptr = dynamic_cast<ast::PointerType const *>( type ) ) {
167 return isPolyType( ptr->base, typeVars, typeSubs );
168 }
169 return nullptr;
170}
171
172ast::Type const * hasPolyBase(
173 ast::Type const * type, const TypeVarMap & typeVars,
174 int * levels, const ast::TypeSubstitution * subst ) {
175 int level_count = 0;
176
177 while ( true ) {
178 type = replaceTypeInst( type, subst );
179
180 if ( auto ptr = dynamic_cast<ast::PointerType const *>( type ) ) {
181 type = ptr->base;
182 ++level_count;
183 } else {
184 break;
185 }
186 }
187
188 if ( nullptr != levels ) { *levels = level_count; }
189 return isPolyType( type, typeVars, subst );
190}
191
192 const ast::FunctionType * getFunctionType( const ast::Type * ty ) {
193 if ( auto pty = dynamic_cast< const ast::PointerType * >( ty ) ) {
194 return pty->base.as< ast::FunctionType >();
195 } else {
196 return dynamic_cast< const ast::FunctionType * >( ty );
197 }
198 }
199
200 namespace {
201 /// Checks if is a pointer to D
202 template<typename D, typename B>
203 bool is( const B* p ) { return type_index{typeid(D)} == type_index{typeid(*p)}; }
204
205 /// Converts to a pointer to D without checking for safety
206 template<typename D, typename B>
207 inline D* as( B* p ) { return reinterpret_cast<D*>(p); }
208
209 template<typename D, typename B>
210 inline D const * as( B const * p ) {
211 return reinterpret_cast<D const *>( p );
212 }
213
214 /// Flattens a list of types.
215 // There is another flattenList in Unify.
216 void flattenList( vector<ast::ptr<ast::Type>> const & src,
217 vector<ast::ptr<ast::Type>> & out ) {
218 for ( auto const & type : src ) {
219 ResolvExpr::flatten( type, out );
220 }
221 }
222
223 bool paramListsPolyCompatible(
224 std::vector<ast::ptr<ast::Expr>> const & lparams,
225 std::vector<ast::ptr<ast::Expr>> const & rparams ) {
226 if ( lparams.size() != rparams.size() ) {
227 return false;
228 }
229
230 for ( auto lparam = lparams.begin(), rparam = rparams.begin() ;
231 lparam != lparams.end() ; ++lparam, ++rparam ) {
232 ast::TypeExpr const * lexpr = lparam->as<ast::TypeExpr>();
233 assertf( lexpr, "Aggregate parameters should be type expressions" );
234 ast::TypeExpr const * rexpr = rparam->as<ast::TypeExpr>();
235 assertf( rexpr, "Aggregate parameters should be type expressions" );
236
237 // xxx - might need to let VoidType be a wildcard here too; could have some voids
238 // stuffed in for dtype-statics.
239 // if ( is<VoidType>( lexpr->type() ) || is<VoidType>( bparam->get_type() ) ) continue;
240 if ( !typesPolyCompatible( lexpr->type, rexpr->type ) ) {
241 return false;
242 }
243 }
244
245 return true;
246 }
247 }
248
249bool typesPolyCompatible( ast::Type const * lhs, ast::Type const * rhs ) {
250 type_index const lid = typeid(*lhs);
251
252 // Polymorphic types always match:
253 if ( type_index(typeid(ast::TypeInstType)) == lid ) return true;
254
255 type_index const rid = typeid(*rhs);
256 if ( type_index(typeid(ast::TypeInstType)) == rid ) return true;
257
258 // All other types only match if they are the same type:
259 if ( lid != rid ) return false;
260
261 // So remaining types can be examined case by case.
262 // Recurse through type structure (conditions borrowed from Unify.cc).
263
264 if ( type_index(typeid(ast::BasicType)) == lid ) {
265 return as<ast::BasicType>(lhs)->kind == as<ast::BasicType>(rhs)->kind;
266 } else if ( type_index(typeid(ast::PointerType)) == lid ) {
267 ast::PointerType const * l = as<ast::PointerType>(lhs);
268 ast::PointerType const * r = as<ast::PointerType>(rhs);
269
270 // void pointers should match any other pointer type.
271 return is<ast::VoidType>( l->base.get() )
272 || is<ast::VoidType>( r->base.get() )
273 || typesPolyCompatible( l->base.get(), r->base.get() );
274 } else if ( type_index(typeid(ast::ReferenceType)) == lid ) {
275 ast::ReferenceType const * l = as<ast::ReferenceType>(lhs);
276 ast::ReferenceType const * r = as<ast::ReferenceType>(rhs);
277
278 // void references should match any other reference type.
279 return is<ast::VoidType>( l->base.get() )
280 || is<ast::VoidType>( r->base.get() )
281 || typesPolyCompatible( l->base.get(), r->base.get() );
282 } else if ( type_index(typeid(ast::ArrayType)) == lid ) {
283 ast::ArrayType const * l = as<ast::ArrayType>(lhs);
284 ast::ArrayType const * r = as<ast::ArrayType>(rhs);
285
286 if ( l->isVarLen ) {
287 if ( !r->isVarLen ) return false;
288 } else {
289 if ( r->isVarLen ) return false;
290
291 auto lc = l->dimension.as<ast::ConstantExpr>();
292 auto rc = r->dimension.as<ast::ConstantExpr>();
293 if ( lc && rc && lc->intValue() != rc->intValue() ) {
294 return false;
295 }
296 }
297
298 return typesPolyCompatible( l->base.get(), r->base.get() );
299 } else if ( type_index(typeid(ast::FunctionType)) == lid ) {
300 ast::FunctionType const * l = as<ast::FunctionType>(lhs);
301 ast::FunctionType const * r = as<ast::FunctionType>(rhs);
302
303 std::vector<ast::ptr<ast::Type>> lparams, rparams;
304 flattenList( l->params, lparams );
305 flattenList( r->params, rparams );
306 if ( lparams.size() != rparams.size() ) return false;
307 for ( unsigned i = 0; i < lparams.size(); ++i ) {
308 if ( !typesPolyCompatible( lparams[i], rparams[i] ) ) return false;
309 }
310
311 std::vector<ast::ptr<ast::Type>> lrets, rrets;
312 flattenList( l->returns, lrets );
313 flattenList( r->returns, rrets );
314 if ( lrets.size() != rrets.size() ) return false;
315 for ( unsigned i = 0; i < lrets.size(); ++i ) {
316 if ( !typesPolyCompatible( lrets[i], rrets[i] ) ) return false;
317 }
318 return true;
319 } else if ( type_index(typeid(ast::StructInstType)) == lid ) {
320 ast::StructInstType const * l = as<ast::StructInstType>(lhs);
321 ast::StructInstType const * r = as<ast::StructInstType>(rhs);
322
323 if ( l->name != r->name ) return false;
324 return paramListsPolyCompatible( l->params, r->params );
325 } else if ( type_index(typeid(ast::UnionInstType)) == lid ) {
326 ast::UnionInstType const * l = as<ast::UnionInstType>(lhs);
327 ast::UnionInstType const * r = as<ast::UnionInstType>(rhs);
328
329 if ( l->name != r->name ) return false;
330 return paramListsPolyCompatible( l->params, r->params );
331 } else if ( type_index(typeid(ast::EnumInstType)) == lid ) {
332 ast::EnumInstType const * l = as<ast::EnumInstType>(lhs);
333 ast::EnumInstType const * r = as<ast::EnumInstType>(rhs);
334
335 return l->name == r->name;
336 } else if ( type_index(typeid(ast::TraitInstType)) == lid ) {
337 ast::TraitInstType const * l = as<ast::TraitInstType>(lhs);
338 ast::TraitInstType const * r = as<ast::TraitInstType>(rhs);
339
340 return l->name == r->name;
341 } else if ( type_index(typeid(ast::TupleType)) == lid ) {
342 ast::TupleType const * l = as<ast::TupleType>(lhs);
343 ast::TupleType const * r = as<ast::TupleType>(rhs);
344
345 std::vector<ast::ptr<ast::Type>> ltypes, rtypes;
346 flattenList( l->types, ( ltypes ) );
347 flattenList( r->types, ( rtypes ) );
348 if ( ltypes.size() != rtypes.size() ) return false;
349
350 for ( unsigned i = 0 ; i < ltypes.size() ; ++i ) {
351 if ( !typesPolyCompatible( ltypes[i], rtypes[i] ) ) return false;
352 }
353 return true;
354 // The remaining types (VoidType, VarArgsType, ZeroType & OneType)
355 // have no variation so will always be equal.
356 } else {
357 return true;
358 }
359}
360
361bool needsBoxing( const ast::Type * param, const ast::Type * arg,
362 const TypeVarMap & typeVars, const ast::TypeSubstitution * subst ) {
363 // Don't need to box if the parameter is not polymorphic.
364 if ( !isPolyType( param, typeVars ) ) return false;
365
366 ast::ptr<ast::Type> newType = arg;
367 if ( subst ) {
368 int count = subst->apply( newType );
369 (void)count;
370 }
371 // Only need to box if the argument is not also polymorphic.
372 return !isPolyType( newType );
373}
374
375bool needsBoxing(
376 const ast::Type * param, const ast::Type * arg,
377 const ast::ApplicationExpr * expr,
378 const ast::TypeSubstitution * subst ) {
379 const ast::FunctionType * function = getFunctionType( expr->func->result );
380 assertf( function, "ApplicationExpr has non-function type: %s", toString( expr->func->result ).c_str() );
381 TypeVarMap exprTyVars;
382 makeTypeVarMap( function, exprTyVars );
383 return needsBoxing( param, arg, exprTyVars, subst );
384}
385
386void addToTypeVarMap( const ast::TypeDecl * decl, TypeVarMap & typeVars ) {
387 typeVars.insert( ast::TypeEnvKey( decl, 0, 0 ), ast::TypeData( decl ) );
388}
389
390void addToTypeVarMap( const ast::TypeInstType * type, TypeVarMap & typeVars ) {
391 typeVars.insert( ast::TypeEnvKey( *type ), ast::TypeData( type->base ) );
392}
393
394void makeTypeVarMap( const ast::Type * type, TypeVarMap & typeVars ) {
395 if ( auto func = dynamic_cast<ast::FunctionType const *>( type ) ) {
396 for ( auto & typeVar : func->forall ) {
397 assert( typeVar );
398 addToTypeVarMap( typeVar, typeVars );
399 }
400 }
401 if ( auto pointer = dynamic_cast<ast::PointerType const *>( type ) ) {
402 makeTypeVarMap( pointer->base, typeVars );
403 }
404}
405
406void makeTypeVarMap( const ast::FunctionDecl * decl, TypeVarMap & typeVars ) {
407 for ( auto & typeDecl : decl->type_params ) {
408 addToTypeVarMap( typeDecl, typeVars );
409 }
410}
411
412} // namespace GenPoly
413
414// Local Variables: //
415// tab-width: 4 //
416// mode: c++ //
417// compile-command: "make install" //
418// End: //
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