source: src/GenPoly/InstantiateGeneric.cc@ 38a0a4d

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since 38a0a4d was 62e5546, checked in by Thierry Delisle <tdelisle@…>, 9 years ago

Removed warnings when compiling with clang
  • Property mode set to 100644
File size: 13.6 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 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// InstantiateGeneric.cc --
8//
9// Author : Aaron B. Moss
10// Created On : Thu Aug 04 18:33:00 2016
11// Last Modified By : Aaron B. Moss
12// Last Modified On : Thu Aug 04 18:33:00 2016
13// Update Count : 1
14//
15
16#include <cassert>
17#include <list>
18#include <utility>
19#include <vector>
20
21#include "InstantiateGeneric.h"
22
23#include "DeclMutator.h"
24#include "GenPoly.h"
25#include "ScopedSet.h"
26
27#include "ResolvExpr/typeops.h"
28
29#include "SynTree/Declaration.h"
30#include "SynTree/Expression.h"
31#include "SynTree/Type.h"
32
33#include "Common/ScopedMap.h"
34#include "Common/UniqueName.h"
35#include "Common/utility.h"
36
37namespace GenPoly {
38
39 /// Abstracts type equality for a list of parameter types
40 struct TypeList {
41 TypeList() : params() {}
42 TypeList( const std::list< Type* > &_params ) : params() { cloneAll(_params, params); }
43 TypeList( std::list< Type* > &&_params ) : params( _params ) {}
44
45 TypeList( const TypeList &that ) : params() { cloneAll(that.params, params); }
46 TypeList( TypeList &&that ) : params( std::move( that.params ) ) {}
47
48 /// Extracts types from a list of TypeExpr*
49 TypeList( const std::list< TypeExpr* >& _params ) : params() {
50 for ( std::list< TypeExpr* >::const_iterator param = _params.begin(); param != _params.end(); ++param ) {
51 params.push_back( (*param)->get_type()->clone() );
52 }
53 }
54
55 TypeList& operator= ( const TypeList &that ) {
56 deleteAll( params );
57
58 params.clear();
59 cloneAll( that.params, params );
60
61 return *this;
62 }
63
64 TypeList& operator= ( TypeList &&that ) {
65 deleteAll( params );
66
67 params = std::move( that.params );
68
69 return *this;
70 }
71
72 ~TypeList() { deleteAll( params ); }
73
74 bool operator== ( const TypeList& that ) const {
75 if ( params.size() != that.params.size() ) return false;
76
77 SymTab::Indexer dummy;
78 for ( std::list< Type* >::const_iterator it = params.begin(), jt = that.params.begin(); it != params.end(); ++it, ++jt ) {
79 if ( ! ResolvExpr::typesCompatible( *it, *jt, dummy ) ) return false;
80 }
81 return true;
82 }
83
84 std::list< Type* > params; ///< Instantiation parameters
85 };
86
87 /// Maps a key and a TypeList to the some value, accounting for scope
88 template< typename Key, typename Value >
89 class InstantiationMap {
90 /// Wraps value for a specific (Key, TypeList) combination
91 typedef std::pair< TypeList, Value* > Instantiation;
92 /// List of TypeLists paired with their appropriate values
93 typedef std::vector< Instantiation > ValueList;
94 /// Underlying map type; maps keys to a linear list of corresponding TypeLists and values
95 typedef ScopedMap< Key*, ValueList > InnerMap;
96
97 InnerMap instantiations; ///< instantiations
98
99 public:
100 /// Starts a new scope
101 void beginScope() { instantiations.beginScope(); }
102
103 /// Ends a scope
104 void endScope() { instantiations.endScope(); }
105
106 /// Gets the value for the (key, typeList) pair, returns NULL on none such.
107 Value *lookup( Key *key, const std::list< TypeExpr* >& params ) const {
108 TypeList typeList( params );
109
110 // scan scopes for matches to the key
111 for ( typename InnerMap::const_iterator insts = instantiations.find( key ); insts != instantiations.end(); insts = instantiations.findNext( insts, key ) ) {
112 for ( typename ValueList::const_reverse_iterator inst = insts->second.rbegin(); inst != insts->second.rend(); ++inst ) {
113 if ( inst->first == typeList ) return inst->second;
114 }
115 }
116 // no matching instantiations found
117 return 0;
118 }
119
120 /// Adds a value for a (key, typeList) pair to the current scope
121 void insert( Key *key, const std::list< TypeExpr* > &params, Value *value ) {
122 instantiations[ key ].push_back( Instantiation( TypeList( params ), value ) );
123 }
124 };
125
126 /// Possible options for a given specialization of a generic type
127 enum class genericType {
128 dtypeStatic, ///< Concrete instantiation based solely on {d,f}type-to-void conversions
129 concrete, ///< Concrete instantiation requiring at least one parameter type
130 dynamic ///< No concrete instantiation
131 };
132
133 genericType& operator |= ( genericType& gt, const genericType& ht ) {
134 switch ( gt ) {
135 case genericType::dtypeStatic:
136 gt = ht;
137 break;
138 case genericType::concrete:
139 if ( ht == genericType::dynamic ) { gt = genericType::dynamic; }
140 break;
141 case genericType::dynamic:
142 // nothing possible
143 break;
144 }
145 return gt;
146 }
147
148 /// Mutator pass that replaces concrete instantiations of generic types with actual struct declarations, scoped appropriately
149 class GenericInstantiator final : public DeclMutator {
150 /// Map of (generic type, parameter list) pairs to concrete type instantiations
151 InstantiationMap< AggregateDecl, AggregateDecl > instantiations;
152 /// Set of types which are dtype-only generic (and therefore have static layout)
153 ScopedSet< AggregateDecl* > dtypeStatics;
154 /// Namer for concrete types
155 UniqueName typeNamer;
156
157 public:
158 GenericInstantiator() : DeclMutator(), instantiations(), dtypeStatics(), typeNamer("_conc_") {}
159
160 using DeclMutator::mutate;
161 virtual Type* mutate( StructInstType *inst ) override;
162 virtual Type* mutate( UnionInstType *inst ) override;
163
164 virtual void doBeginScope() override;
165 virtual void doEndScope() override;
166 private:
167 /// Wrap instantiation lookup for structs
168 StructDecl* lookup( StructInstType *inst, const std::list< TypeExpr* > &typeSubs ) { return (StructDecl*)instantiations.lookup( inst->get_baseStruct(), typeSubs ); }
169 /// Wrap instantiation lookup for unions
170 UnionDecl* lookup( UnionInstType *inst, const std::list< TypeExpr* > &typeSubs ) { return (UnionDecl*)instantiations.lookup( inst->get_baseUnion(), typeSubs ); }
171 /// Wrap instantiation insertion for structs
172 void insert( StructInstType *inst, const std::list< TypeExpr* > &typeSubs, StructDecl *decl ) { instantiations.insert( inst->get_baseStruct(), typeSubs, decl ); }
173 /// Wrap instantiation insertion for unions
174 void insert( UnionInstType *inst, const std::list< TypeExpr* > &typeSubs, UnionDecl *decl ) { instantiations.insert( inst->get_baseUnion(), typeSubs, decl ); }
175
176 /// Strips a dtype-static aggregate decl of its type parameters, marks it as stripped
177 void stripDtypeParams( AggregateDecl *base, std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs );
178 };
179
180 void instantiateGeneric( std::list< Declaration* > &translationUnit ) {
181 GenericInstantiator instantiator;
182 instantiator.mutateDeclarationList( translationUnit );
183 }
184
185 /// Makes substitutions of params into baseParams; returns dtypeStatic if there is a concrete instantiation based only on {d,f}type-to-void conversions,
186 /// concrete if there is a concrete instantiation requiring at least one parameter type, and dynamic if there is no concrete instantiation
187 genericType makeSubstitutions( const std::list< TypeDecl* >& baseParams, const std::list< Expression* >& params, std::list< TypeExpr* >& out ) {
188 genericType gt = genericType::dtypeStatic;
189
190 // substitute concrete types for given parameters, and incomplete types for placeholders
191 std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
192 std::list< Expression* >::const_iterator param = params.begin();
193 for ( ; baseParam != baseParams.end() && param != params.end(); ++baseParam, ++param ) {
194 TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
195 assert(paramType && "Aggregate parameters should be type expressions");
196
197 switch ( (*baseParam)->get_kind() ) {
198 case TypeDecl::Any: {
199 // substitute parameter for otype; makes the type concrete or dynamic depending on the parameter
200 out.push_back( paramType->clone() );
201 gt |= isPolyType( paramType->get_type() ) ? genericType::dynamic : genericType::concrete;
202 break;
203 }
204 case TypeDecl::Dtype:
205 // can pretend that any dtype is `void`
206 out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
207 break;
208 case TypeDecl::Ftype:
209 // can pretend that any ftype is `void (*)(void)`
210 out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
211 break;
212 }
213 }
214
215 assert( baseParam == baseParams.end() && param == params.end() && "Type parameters should match type variables" );
216 return gt;
217 }
218
219 /// Substitutes types of members of in according to baseParams => typeSubs, appending the result to out
220 void substituteMembers( const std::list< Declaration* >& in, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs,
221 std::list< Declaration* >& out ) {
222 // substitute types into new members
223 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
224 for ( std::list< Declaration* >::const_iterator member = in.begin(); member != in.end(); ++member ) {
225 Declaration *newMember = (*member)->clone();
226 subs.apply(newMember);
227 out.push_back( newMember );
228 }
229 }
230
231 /// Substitutes types of members according to baseParams => typeSubs, working in-place
232 void substituteMembers( std::list< Declaration* >& members, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs ) {
233 // substitute types into new members
234 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
235 for ( std::list< Declaration* >::iterator member = members.begin(); member != members.end(); ++member ) {
236 subs.apply(*member);
237 }
238 }
239
240 /// Strips the instances's type parameters
241 void stripInstParams( ReferenceToType *inst ) {
242 deleteAll( inst->get_parameters() );
243 inst->get_parameters().clear();
244 }
245
246 void GenericInstantiator::stripDtypeParams( AggregateDecl *base, std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs ) {
247 substituteMembers( base->get_members(), baseParams, typeSubs );
248
249 deleteAll( baseParams );
250 baseParams.clear();
251
252 dtypeStatics.insert( base );
253 }
254
255 Type* GenericInstantiator::mutate( StructInstType *inst ) {
256 // mutate subtypes
257 Type *mutated = Mutator::mutate( inst );
258 inst = dynamic_cast< StructInstType* >( mutated );
259 if ( ! inst ) return mutated;
260
261 // exit early if no need for further mutation
262 if ( inst->get_parameters().empty() ) return inst;
263
264 // check for an already-instantiatiated dtype-static type
265 if ( dtypeStatics.find( inst->get_baseStruct() ) != dtypeStatics.end() ) {
266 stripInstParams( inst );
267 return inst;
268 }
269
270 // check if type can be concretely instantiated; put substitutions into typeSubs
271 assert( inst->get_baseParameters() && "Base struct has parameters" );
272 std::list< TypeExpr* > typeSubs;
273 genericType gt = makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs );
274 switch ( gt ) {
275 case genericType::dtypeStatic:
276 stripDtypeParams( inst->get_baseStruct(), *inst->get_baseParameters(), typeSubs );
277 stripInstParams( inst );
278 break;
279
280 case genericType::concrete: {
281 // make concrete instantiation of generic type
282 StructDecl *concDecl = lookup( inst, typeSubs );
283 if ( ! concDecl ) {
284 // set concDecl to new type, insert type declaration into statements to add
285 concDecl = new StructDecl( typeNamer.newName( inst->get_name() ) );
286 substituteMembers( inst->get_baseStruct()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
287 DeclMutator::addDeclaration( concDecl );
288 insert( inst, typeSubs, concDecl );
289 }
290 StructInstType *newInst = new StructInstType( inst->get_qualifiers(), concDecl->get_name() );
291 newInst->set_baseStruct( concDecl );
292
293 delete inst;
294 inst = newInst;
295 break;
296 }
297
298 case genericType::dynamic:
299 // do nothing
300 break;
301 }
302
303 deleteAll( typeSubs );
304 return inst;
305 }
306
307 Type* GenericInstantiator::mutate( UnionInstType *inst ) {
308 // mutate subtypes
309 Type *mutated = Mutator::mutate( inst );
310 inst = dynamic_cast< UnionInstType* >( mutated );
311 if ( ! inst ) return mutated;
312
313 // exit early if no need for further mutation
314 if ( inst->get_parameters().empty() ) return inst;
315
316 // check for an already-instantiatiated dtype-static type
317 if ( dtypeStatics.find( inst->get_baseUnion() ) != dtypeStatics.end() ) {
318 stripInstParams( inst );
319 return inst;
320 }
321
322 // check if type can be concretely instantiated; put substitutions into typeSubs
323 assert( inst->get_baseParameters() && "Base union has parameters" );
324 std::list< TypeExpr* > typeSubs;
325 genericType gt = makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs );
326 switch ( gt ) {
327 case genericType::dtypeStatic:
328 stripDtypeParams( inst->get_baseUnion(), *inst->get_baseParameters(), typeSubs );
329 stripInstParams( inst );
330 break;
331
332 case genericType::concrete:
333 {
334 // make concrete instantiation of generic type
335 UnionDecl *concDecl = lookup( inst, typeSubs );
336 if ( ! concDecl ) {
337 // set concDecl to new type, insert type declaration into statements to add
338 concDecl = new UnionDecl( typeNamer.newName( inst->get_name() ) );
339 substituteMembers( inst->get_baseUnion()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
340 DeclMutator::addDeclaration( concDecl );
341 insert( inst, typeSubs, concDecl );
342 }
343 UnionInstType *newInst = new UnionInstType( inst->get_qualifiers(), concDecl->get_name() );
344 newInst->set_baseUnion( concDecl );
345
346 delete inst;
347 inst = newInst;
348 break;
349 }
350 case genericType::dynamic:
351 // do nothing
352 break;
353 }
354
355 deleteAll( typeSubs );
356 return inst;
357 }
358
359 void GenericInstantiator::doBeginScope() {
360 DeclMutator::doBeginScope();
361 instantiations.beginScope();
362 dtypeStatics.beginScope();
363 }
364
365 void GenericInstantiator::doEndScope() {
366 DeclMutator::doEndScope();
367 instantiations.endScope();
368 dtypeStatics.endScope();
369 }
370
371} // namespace GenPoly
372
373// Local Variables: //
374// tab-width: 4 //
375// mode: c++ //
376// compile-command: "make install" //
377// End: //
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