source: src/GenPoly/InstantiateGeneric.cc@ 1958fec

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 1958fec was 1c1395d, checked in by Fangren Yu <f37yu@…>, 5 years ago

cleanup commented code
  • Property mode set to 100644
File size: 23.8 KB
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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 : Andrew Beach
12// Last Modified On : Wed Jul 16 10:17:00 2020
13// Update Count : 2
14//
15#include "InstantiateGeneric.h"
16
17#include <cassert> // for assertf, assert
18#include <iterator> // for back_inserter, inserter
19#include <list> // for list, _List_const_iterator
20#include <utility> // for move, pair
21#include <vector> // for vector
22
23#include "CodeGen/OperatorTable.h"
24#include "Common/PassVisitor.h" // for PassVisitor, WithDeclsToAdd
25#include "Common/ScopedMap.h" // for ScopedMap
26#include "Common/UniqueName.h" // for UniqueName
27#include "Common/utility.h" // for deleteAll, cloneAll
28#include "GenPoly.h" // for isPolyType, typesPolyCompatible
29#include "InitTweak/InitTweak.h"
30#include "ResolvExpr/typeops.h"
31#include "ScopedSet.h" // for ScopedSet, ScopedSet<>::iterator
32#include "ScrubTyVars.h" // for ScrubTyVars
33#include "SynTree/Declaration.h" // for StructDecl, UnionDecl, TypeDecl
34#include "SynTree/Expression.h" // for TypeExpr, Expression
35#include "SynTree/Mutator.h" // for mutateAll
36#include "SynTree/Type.h" // for StructInstType, UnionInstType
37#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
38#include "SynTree/Visitor.h" // for acceptAll
39
40
41namespace GenPoly {
42
43 /// Abstracts type equality for a list of parameter types
44 struct TypeList {
45 TypeList() : params() {}
46 TypeList( const std::list< Type* > &_params ) : params() { cloneAll(_params, params); }
47 TypeList( std::list< Type* > &&_params ) : params( _params ) {}
48
49 TypeList( const TypeList &that ) : params() { cloneAll(that.params, params); }
50 TypeList( TypeList &&that ) : params( std::move( that.params ) ) {}
51
52 /// Extracts types from a list of TypeExpr*
53 TypeList( const std::list< TypeExpr* >& _params ) : params() {
54 for ( std::list< TypeExpr* >::const_iterator param = _params.begin(); param != _params.end(); ++param ) {
55 params.push_back( (*param)->get_type()->clone() );
56 }
57 }
58
59 TypeList& operator= ( const TypeList &that ) {
60 deleteAll( params );
61
62 params.clear();
63 cloneAll( that.params, params );
64
65 return *this;
66 }
67
68 TypeList& operator= ( TypeList &&that ) {
69 deleteAll( params );
70
71 params = std::move( that.params );
72
73 return *this;
74 }
75
76 ~TypeList() { deleteAll( params ); }
77
78 bool operator== ( const TypeList& that ) const {
79 if ( params.size() != that.params.size() ) return false;
80
81 for ( std::list< Type* >::const_iterator it = params.begin(), jt = that.params.begin(); it != params.end(); ++it, ++jt ) {
82 if ( ! typesPolyCompatible( *it, *jt ) ) return false;
83 }
84 return true;
85 }
86
87 std::list< Type* > params; ///< Instantiation parameters
88 };
89
90 /// Maps a key and a TypeList to the some value, accounting for scope
91 template< typename Key, typename Value >
92 class InstantiationMap {
93 /// Wraps value for a specific (Key, TypeList) combination
94 typedef std::pair< TypeList, Value* > Instantiation;
95 /// List of TypeLists paired with their appropriate values
96 typedef std::vector< Instantiation > ValueList;
97 /// Underlying map type; maps keys to a linear list of corresponding TypeLists and values
98 typedef ScopedMap< Key*, ValueList > InnerMap;
99
100 InnerMap instantiations; ///< instantiations
101
102 public:
103 /// Starts a new scope
104 void beginScope() { instantiations.beginScope(); }
105
106 /// Ends a scope
107 void endScope() { instantiations.endScope(); }
108
109 /// Gets the value for the (key, typeList) pair, returns NULL on none such.
110 Value *lookup( Key *key, const std::list< TypeExpr* >& params ) const {
111 TypeList typeList( params );
112
113 // scan scopes for matches to the key
114 for ( typename InnerMap::const_iterator insts = instantiations.find( key ); insts != instantiations.end(); insts = instantiations.findNext( insts, key ) ) {
115 for ( typename ValueList::const_reverse_iterator inst = insts->second.rbegin(); inst != insts->second.rend(); ++inst ) {
116 if ( inst->first == typeList ) return inst->second;
117 }
118 }
119 // no matching instantiations found
120 return 0;
121 }
122
123 /// Adds a value for a (key, typeList) pair to the current scope
124 void insert( Key *key, const std::list< TypeExpr* > &params, Value *value ) {
125 auto it = instantiations.findAt( instantiations.currentScope(), key );
126 if ( it == instantiations.end() ) {
127 instantiations.insert( key, ValueList{ Instantiation{ TypeList( params ), value } } );
128 } else {
129 it->second.push_back( Instantiation{ TypeList( params ), value } );
130 }
131 }
132 };
133
134 /// Possible options for a given specialization of a generic type
135 enum class genericType {
136 dtypeStatic, ///< Concrete instantiation based solely on {d,f}type-to-void conversions
137 concrete, ///< Concrete instantiation requiring at least one parameter type
138 dynamic ///< No concrete instantiation
139 };
140
141 genericType& operator |= ( genericType& gt, const genericType& ht ) {
142 switch ( gt ) {
143 case genericType::dtypeStatic:
144 gt = ht;
145 break;
146 case genericType::concrete:
147 if ( ht == genericType::dynamic ) { gt = genericType::dynamic; }
148 break;
149 case genericType::dynamic:
150 // nothing possible
151 break;
152 }
153 return gt;
154 }
155
156 /// Add cast to dtype-static member expressions so that type information is not lost in GenericInstantiator
157 struct FixDtypeStatic final : public WithGuards, public WithVisitorRef<FixDtypeStatic>, public WithShortCircuiting, public WithStmtsToAdd {
158 Expression * postmutate( MemberExpr * memberExpr );
159
160 void premutate( ApplicationExpr * appExpr );
161 void premutate( AddressExpr * addrExpr );
162
163 template<typename AggrInst>
164 Expression * fixMemberExpr( AggrInst * inst, MemberExpr * memberExpr );
165
166 bool isLvalueArg = false;
167 };
168
169 /// Mutator pass that replaces concrete instantiations of generic types with actual struct declarations, scoped appropriately
170 struct GenericInstantiator final : public WithConstTypeSubstitution, public WithDeclsToAdd, public WithVisitorRef<GenericInstantiator>, public WithGuards {
171 /// Map of (generic type, parameter list) pairs to concrete type instantiations
172 InstantiationMap< AggregateDecl, AggregateDecl > instantiations;
173 /// Set of types which are dtype-only generic (and therefore have static layout)
174 std::set<AggregateDecl *> dtypeStatics;
175 /// Namer for concrete types
176 UniqueName typeNamer;
177 /// Should not make use of type environment to replace types of function parameter and return values.
178 bool inFunctionType = false;
179 /// Index of current member, used to recreate MemberExprs with the member from an instantiation
180 int memberIndex = -1;
181 GenericInstantiator() : instantiations(), dtypeStatics(), typeNamer("_conc_") {}
182
183 Type* postmutate( StructInstType *inst );
184 Type* postmutate( UnionInstType *inst );
185
186 // fix MemberExprs to use the member from the instantiation
187 void premutate( MemberExpr * memberExpr );
188 Expression * postmutate( MemberExpr * memberExpr );
189
190 void premutate( FunctionType * ) {
191 GuardValue( inFunctionType );
192 inFunctionType = true;
193 }
194
195 void beginScope();
196 void endScope();
197 private:
198 /// Wrap instantiation lookup for structs
199 StructDecl* lookup( StructInstType *inst, const std::list< TypeExpr* > &typeSubs ) { return (StructDecl*)instantiations.lookup( inst->get_baseStruct(), typeSubs ); }
200 /// Wrap instantiation lookup for unions
201 UnionDecl* lookup( UnionInstType *inst, const std::list< TypeExpr* > &typeSubs ) { return (UnionDecl*)instantiations.lookup( inst->get_baseUnion(), typeSubs ); }
202 /// Wrap instantiation insertion for structs
203 void insert( StructInstType *inst, const std::list< TypeExpr* > &typeSubs, StructDecl *decl ) { instantiations.insert( inst->get_baseStruct(), typeSubs, decl ); }
204 /// Wrap instantiation insertion for unions
205 void insert( UnionInstType *inst, const std::list< TypeExpr* > &typeSubs, UnionDecl *decl ) { instantiations.insert( inst->get_baseUnion(), typeSubs, decl ); }
206
207 void replaceParametersWithConcrete( std::list< Expression* >& params );
208 Type *replaceWithConcrete( Type *type, bool doClone );
209
210 /// Strips a dtype-static aggregate decl of its type parameters, marks it as stripped
211 void stripDtypeParams( AggregateDecl *base, std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs );
212 };
213
214 void instantiateGeneric( std::list< Declaration* > &translationUnit ) {
215 PassVisitor<FixDtypeStatic> fixer;
216 PassVisitor<GenericInstantiator> instantiator;
217
218 mutateAll( translationUnit, fixer );
219 mutateAll( translationUnit, instantiator );
220 }
221
222 bool isDtypeStatic( const std::list< TypeDecl* >& baseParams ) {
223 return std::all_of( baseParams.begin(), baseParams.end(), []( TypeDecl * td ) { return ! td->isComplete(); } );
224 }
225
226 /// Makes substitutions of params into baseParams; returns dtypeStatic if there is a concrete instantiation based only on {d,f}type-to-void conversions,
227 /// concrete if there is a concrete instantiation requiring at least one parameter type, and dynamic if there is no concrete instantiation
228 genericType makeSubstitutions( const std::list< TypeDecl* >& baseParams, const std::list< Expression* >& params, std::list< TypeExpr* >& out ) {
229 genericType gt = genericType::dtypeStatic;
230
231 // substitute concrete types for given parameters, and incomplete types for placeholders
232 std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
233 std::list< Expression* >::const_iterator param = params.begin();
234 for ( ; baseParam != baseParams.end() && param != params.end(); ++baseParam, ++param ) {
235 TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
236 assert(paramType && "Aggregate parameters should be type expressions");
237
238 if ( (*baseParam)->isComplete() ) {
239 // substitute parameter for complete (otype or sized dtype) type
240 if ( isPolyType( paramType->get_type() ) ) {
241 // substitute polymorphic parameter type in to generic type
242 out.push_back( paramType->clone() );
243 gt = genericType::dynamic;
244 } else {
245 // normalize possibly dtype-static parameter type
246 out.push_back( new TypeExpr{
247 ScrubTyVars::scrubAll( paramType->get_type()->clone() ) } );
248 gt |= genericType::concrete;
249 }
250 } else switch ( (*baseParam)->get_kind() ) {
251 case TypeDecl::Dtype:
252 // can pretend that any incomplete dtype is `void`
253 out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
254 break;
255 case TypeDecl::Ftype:
256 // can pretend that any ftype is `void (*)(void)`
257 out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
258 break;
259 case TypeDecl::Ttype:
260 assertf( false, "Ttype parameters are not currently allowed as parameters to generic types." );
261 break;
262 default:
263 assertf( false, "Unhandled type parameter kind" );
264 break;
265 }
266 }
267
268 assertf( baseParam == baseParams.end() && param == params.end(), "Type parameters should match type variables" );
269 return gt;
270 }
271
272 /// Substitutes types of members of in according to baseParams => typeSubs, appending the result to out
273 void substituteMembers( const std::list< Declaration* >& in, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs,
274 std::list< Declaration* >& out ) {
275 // substitute types into new members
276 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
277 for ( std::list< Declaration* >::const_iterator member = in.begin(); member != in.end(); ++member ) {
278 Declaration *newMember = (*member)->clone();
279 subs.apply(newMember);
280 out.push_back( newMember );
281 }
282 }
283
284 /// Substitutes types of members according to baseParams => typeSubs, working in-place
285 void substituteMembers( std::list< Declaration* >& members, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs ) {
286 // substitute types into new members
287 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
288 for ( std::list< Declaration* >::iterator member = members.begin(); member != members.end(); ++member ) {
289 subs.apply(*member);
290 }
291 }
292
293 /// Strips the instances's type parameters
294 void stripInstParams( ReferenceToType *inst ) {
295 deleteAll( inst->get_parameters() );
296 inst->get_parameters().clear();
297 }
298
299 template< typename AggrInst >
300 static AggrInst * asForward( AggrInst * decl ) {
301 if ( !decl->body ) {
302 return nullptr;
303 }
304 decl = decl->clone();
305 decl->body = false;
306 deleteAll( decl->members );
307 decl->members.clear();
308 return decl;
309 }
310
311 void GenericInstantiator::stripDtypeParams( AggregateDecl *base, std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs ) {
312 substituteMembers( base->get_members(), baseParams, typeSubs );
313
314 // xxx - can't delete type parameters because they may have assertions that are used
315 // deleteAll( baseParams );
316 baseParams.clear();
317
318 dtypeStatics.insert( base );
319 }
320
321 /// xxx - more or less copied from box -- these should be merged with those somehow...
322 void GenericInstantiator::replaceParametersWithConcrete( std::list< Expression* >& params ) {
323 for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
324 TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
325 assertf(paramType, "Aggregate parameters should be type expressions");
326 paramType->set_type( replaceWithConcrete( paramType->get_type(), false ) );
327 }
328 }
329
330 Type *GenericInstantiator::replaceWithConcrete( Type *type, bool doClone ) {
331 if ( TypeInstType *typeInst = dynamic_cast< TypeInstType * >( type ) ) {
332 if ( env && ! inFunctionType ) {
333 Type *concrete = env->lookup( typeInst->get_name() );
334 if ( concrete ) {
335 return concrete->clone();
336 }
337 else return typeInst->clone();
338 }
339 } else if ( StructInstType *structType = dynamic_cast< StructInstType* >( type ) ) {
340 if ( doClone ) {
341 structType = structType->clone();
342 }
343 replaceParametersWithConcrete( structType->get_parameters() );
344 return structType;
345 } else if ( UnionInstType *unionType = dynamic_cast< UnionInstType* >( type ) ) {
346 if ( doClone ) {
347 unionType = unionType->clone();
348 }
349 replaceParametersWithConcrete( unionType->get_parameters() );
350 return unionType;
351 }
352 return type;
353 }
354
355
356 Type* GenericInstantiator::postmutate( StructInstType *inst ) {
357 // exit early if no need for further mutation
358 if ( inst->get_parameters().empty() ) return inst;
359
360 // need to replace type variables to ensure that generic types are instantiated for the return values of polymorphic functions (in particular, for thunks, because they are not [currently] copy constructed).
361 replaceWithConcrete( inst, false );
362
363 // check for an already-instantiatiated dtype-static type
364 if ( dtypeStatics.find( inst->get_baseStruct() ) != dtypeStatics.end() ) {
365 stripInstParams( inst );
366 return inst;
367 }
368
369 // check if type can be concretely instantiated; put substitutions into typeSubs
370 assertf( inst->get_baseParameters(), "Base struct has parameters" );
371 std::list< TypeExpr* > typeSubs;
372 genericType gt = makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs );
373 switch ( gt ) {
374 case genericType::dtypeStatic:
375 stripDtypeParams( inst->get_baseStruct(), *inst->get_baseParameters(), typeSubs );
376 stripInstParams( inst );
377 break;
378
379 case genericType::concrete: {
380 // make concrete instantiation of generic type
381 StructDecl *concDecl = lookup( inst, typeSubs );
382 if ( ! concDecl ) {
383 // set concDecl to new type, insert type declaration into statements to add
384 concDecl = new StructDecl( typeNamer.newName( inst->get_name() ) );
385 concDecl->set_body( inst->get_baseStruct()->has_body() );
386 substituteMembers( inst->get_baseStruct()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
387 // Forward declare before recursion. (TODO: Only when needed, #199.)
388 insert( inst, typeSubs, concDecl );
389 if ( StructDecl *forwardDecl = asForward( concDecl ) ) {
390 declsToAddBefore.push_back( forwardDecl );
391 }
392 concDecl->acceptMutator( *visitor ); // recursively instantiate members
393 declsToAddBefore.push_back( concDecl ); // must occur before declaration is added so that member instantiations appear first
394 }
395 StructInstType *newInst = new StructInstType( inst->get_qualifiers(), concDecl->get_name() );
396 newInst->set_baseStruct( concDecl );
397
398 delete inst;
399 inst = newInst;
400 break;
401 }
402
403 case genericType::dynamic:
404 // do nothing
405 break;
406 }
407
408 deleteAll( typeSubs );
409 return inst;
410 }
411
412 Type* GenericInstantiator::postmutate( UnionInstType *inst ) {
413 // exit early if no need for further mutation
414 if ( inst->get_parameters().empty() ) return inst;
415
416 // check for an already-instantiatiated dtype-static type
417 if ( dtypeStatics.find( inst->get_baseUnion() ) != dtypeStatics.end() ) {
418 stripInstParams( inst );
419 return inst;
420 }
421
422 // check if type can be concretely instantiated; put substitutions into typeSubs
423 assert( inst->get_baseParameters() && "Base union has parameters" );
424 std::list< TypeExpr* > typeSubs;
425 genericType gt = makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs );
426 switch ( gt ) {
427 case genericType::dtypeStatic:
428 stripDtypeParams( inst->get_baseUnion(), *inst->get_baseParameters(), typeSubs );
429 stripInstParams( inst );
430 break;
431
432 case genericType::concrete:
433 {
434 // make concrete instantiation of generic type
435 UnionDecl *concDecl = lookup( inst, typeSubs );
436 if ( ! concDecl ) {
437 // set concDecl to new type, insert type declaration into statements to add
438 concDecl = new UnionDecl( typeNamer.newName( inst->get_name() ) );
439 concDecl->set_body( inst->get_baseUnion()->has_body() );
440 substituteMembers( inst->get_baseUnion()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
441 // Forward declare before recursion. (TODO: Only when needed, #199.)
442 insert( inst, typeSubs, concDecl );
443 if ( UnionDecl *forwardDecl = asForward( concDecl ) ) {
444 declsToAddBefore.push_back( forwardDecl );
445 }
446 concDecl->acceptMutator( *visitor ); // recursively instantiate members
447 declsToAddBefore.push_back( concDecl ); // must occur before declaration is added so that member instantiations appear first
448 }
449 UnionInstType *newInst = new UnionInstType( inst->get_qualifiers(), concDecl->get_name() );
450 newInst->set_baseUnion( concDecl );
451
452 delete inst;
453 inst = newInst;
454 break;
455 }
456 case genericType::dynamic:
457 // do nothing
458 break;
459 }
460
461 deleteAll( typeSubs );
462 return inst;
463 }
464
465 namespace {
466 bool isGenericType( Type * t ) {
467 if ( StructInstType * inst = dynamic_cast< StructInstType * >( t ) ) {
468 return ! inst->parameters.empty();
469 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( t ) ) {
470 return ! inst->parameters.empty();
471 }
472 return false;
473 }
474 }
475
476 void GenericInstantiator::premutate( MemberExpr * memberExpr ) {
477 GuardValue( memberIndex );
478 memberIndex = -1;
479 if ( isGenericType( memberExpr->aggregate->result ) ) {
480 // find the location of the member
481 AggregateDecl * aggr = memberExpr->aggregate->result->getAggr();
482 std::list< Declaration * > & members = aggr->members;
483 memberIndex = std::distance( members.begin(), std::find( members.begin(), members.end(), memberExpr->member ) );
484 assertf( memberIndex < (int)members.size(), "Could not find member %s in generic type %s", toString( memberExpr->member ).c_str(), toString( memberExpr->aggregate ).c_str() );
485 }
486 }
487
488 Expression * GenericInstantiator::postmutate( MemberExpr * memberExpr ) {
489 if ( memberIndex != -1 ) {
490 // using the location from the generic type, find the member in the instantiation and rebuild the member expression
491 AggregateDecl * aggr = memberExpr->aggregate->result->getAggr();
492 assertf( memberIndex < (int)aggr->members.size(), "Instantiation somehow has fewer members than the generic type." );
493 Declaration * member = *std::next( aggr->members.begin(), memberIndex );
494 assertf( member->name == memberExpr->member->name, "Instantiation has different member order than the generic type. %s / %s", toString( member ).c_str(), toString( memberExpr->member ).c_str() );
495 DeclarationWithType * field = strict_dynamic_cast< DeclarationWithType * >( member );
496 MemberExpr * ret = new MemberExpr( field, memberExpr->aggregate->clone() );
497 ResolvExpr::adjustExprType( ret->result ); // pointer decay
498 std::swap( ret->env, memberExpr->env );
499 delete memberExpr;
500 return ret;
501 }
502 return memberExpr;
503 }
504
505 void GenericInstantiator::beginScope() {
506 instantiations.beginScope();
507 }
508
509 void GenericInstantiator::endScope() {
510 instantiations.endScope();
511 }
512
513 template< typename AggrInst >
514 Expression * FixDtypeStatic::fixMemberExpr( AggrInst * inst, MemberExpr * memberExpr ) {
515 // need to cast dtype-static member expressions to their actual type before that type is erased.
516 // NOTE: the casts here have the third argument (isGenerated) set to false so that these casts persist until Box, where they are needed.
517 auto & baseParams = *inst->get_baseParameters();
518 if ( isDtypeStatic( baseParams ) ) {
519 if ( ! ResolvExpr::typesCompatible( memberExpr->result, memberExpr->member->get_type(), SymTab::Indexer() ) ) {
520 // type of member and type of expression differ
521 Type * concType = memberExpr->result->clone();
522 if ( isLvalueArg ) {
523 // result must be C lvalue, so make a new reference variable with the correct actual type to replace the member expression
524 // forall(dtype T)
525 // struct Ptr {
526 // T * x
527 // };
528 // Ptr(int) p;
529 // int i;
530 // p.x = &i;
531 // becomes
532 // int *& _dtype_static_member_0 = (int **)&p.x;
533 // _dtype_static_member_0 = &i;
534 // Note: this currently creates more temporaries than is strictly necessary, since it does not check for duplicate uses of the same member expression.
535 static UniqueName tmpNamer( "_dtype_static_member_" );
536 Expression * init = new CastExpr( new AddressExpr( memberExpr ), new PointerType( Type::Qualifiers(), concType->clone() ), false );
537 ObjectDecl * tmp = ObjectDecl::newObject( tmpNamer.newName(), new ReferenceType( Type::Qualifiers(), concType ), new SingleInit( init ) );
538 stmtsToAddBefore.push_back( new DeclStmt( tmp ) );
539 return new VariableExpr( tmp );
540 } else {
541 // can simply add a cast to actual type
542 return new CastExpr( memberExpr, concType, false );
543 }
544 }
545 }
546 return memberExpr;
547 }
548
549 Expression * FixDtypeStatic::postmutate( MemberExpr * memberExpr ) {
550 Type * aggrType = memberExpr->aggregate->result;
551 if ( isGenericType( aggrType ) ) {
552 if ( StructInstType * inst = dynamic_cast< StructInstType * >( aggrType ) ) {
553 return fixMemberExpr( inst, memberExpr );
554 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( aggrType ) ) {
555 return fixMemberExpr( inst, memberExpr );
556 }
557 }
558 return memberExpr;
559 }
560
561 void FixDtypeStatic::premutate( ApplicationExpr * appExpr ) {
562 GuardValue( isLvalueArg );
563 isLvalueArg = false;
564 DeclarationWithType * function = InitTweak::getFunction( appExpr );
565 if ( function->linkage == LinkageSpec::Intrinsic && CodeGen::isAssignment( function->name ) ) {
566 // explicitly visit children because only the first argument must be a C lvalue.
567 visit_children = false;
568 appExpr->env = maybeMutate( appExpr->env, *visitor );
569 appExpr->result = maybeMutate( appExpr->result, *visitor );
570 appExpr->function = maybeMutate( appExpr->function, *visitor );
571 isLvalueArg = true;
572 for ( Expression * arg : appExpr->args ) {
573 arg = maybeMutate( arg, *visitor );
574 isLvalueArg = false;
575 }
576 }
577 }
578
579 void FixDtypeStatic::premutate( AddressExpr * ) {
580 // argument of & must be C lvalue
581 GuardValue( isLvalueArg );
582 isLvalueArg = true;
583 }
584} // namespace GenPoly
585
586// Local Variables: //
587// tab-width: 4 //
588// mode: c++ //
589// compile-command: "make install" //
590// End: //
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