source: src/GenPoly/InstantiateGeneric.cc@ 5af7306

new-env with_gc
Last change on this file since 5af7306 was 68f9c43, checked in by Aaron Moss <a3moss@…>, 8 years ago

First pass at delete removal
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File size: 22.8 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 : Aaron B. Moss
12// Last Modified On : Thu Aug 04 18:33:00 2016
13// Update Count : 1
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 params.clear();
61 cloneAll( that.params, params );
62
63 return *this;
64 }
65
66 TypeList& operator= ( TypeList &&that ) {
67 params = std::move( that.params );
68
69 return *this;
70 }
71
72 ~TypeList() {}
73
74 bool operator== ( const TypeList& that ) const {
75 if ( params.size() != that.params.size() ) return false;
76
77 for ( std::list< Type* >::const_iterator it = params.begin(), jt = that.params.begin(); it != params.end(); ++it, ++jt ) {
78 if ( ! typesPolyCompatible( *it, *jt ) ) return false;
79 }
80 return true;
81 }
82
83 std::list< Type* > params; ///< Instantiation parameters
84 };
85
86 /// Maps a key and a TypeList to the some value, accounting for scope
87 template< typename Key, typename Value >
88 class InstantiationMap {
89 /// Wraps value for a specific (Key, TypeList) combination
90 typedef std::pair< TypeList, Value* > Instantiation;
91 /// List of TypeLists paired with their appropriate values
92 typedef std::vector< Instantiation > ValueList;
93 /// Underlying map type; maps keys to a linear list of corresponding TypeLists and values
94 typedef ScopedMap< Key*, ValueList > InnerMap;
95
96 InnerMap instantiations; ///< instantiations
97
98 public:
99 /// Starts a new scope
100 void beginScope() { instantiations.beginScope(); }
101
102 /// Ends a scope
103 void endScope() { instantiations.endScope(); }
104
105 /// Gets the value for the (key, typeList) pair, returns NULL on none such.
106 Value *lookup( Key *key, const std::list< TypeExpr* >& params ) const {
107 TypeList typeList( params );
108
109 // scan scopes for matches to the key
110 for ( typename InnerMap::const_iterator insts = instantiations.find( key ); insts != instantiations.end(); insts = instantiations.findNext( insts, key ) ) {
111 for ( typename ValueList::const_reverse_iterator inst = insts->second.rbegin(); inst != insts->second.rend(); ++inst ) {
112 if ( inst->first == typeList ) return inst->second;
113 }
114 }
115 // no matching instantiations found
116 return 0;
117 }
118
119 /// Adds a value for a (key, typeList) pair to the current scope
120 void insert( Key *key, const std::list< TypeExpr* > &params, Value *value ) {
121 auto it = instantiations.findAt( instantiations.currentScope(), key );
122 if ( it == instantiations.end() ) {
123 instantiations.insert( key, ValueList{ Instantiation{ TypeList( params ), value } } );
124 } else {
125 it->second.push_back( Instantiation{ TypeList( params ), value } );
126 }
127 }
128 };
129
130 /// Possible options for a given specialization of a generic type
131 enum class genericType {
132 dtypeStatic, ///< Concrete instantiation based solely on {d,f}type-to-void conversions
133 concrete, ///< Concrete instantiation requiring at least one parameter type
134 dynamic ///< No concrete instantiation
135 };
136
137 genericType& operator |= ( genericType& gt, const genericType& ht ) {
138 switch ( gt ) {
139 case genericType::dtypeStatic:
140 gt = ht;
141 break;
142 case genericType::concrete:
143 if ( ht == genericType::dynamic ) { gt = genericType::dynamic; }
144 break;
145 case genericType::dynamic:
146 // nothing possible
147 break;
148 }
149 return gt;
150 }
151
152 /// Add cast to dtype-static member expressions so that type information is not lost in GenericInstantiator
153 struct FixDtypeStatic final : public WithGuards, public WithVisitorRef<FixDtypeStatic>, public WithShortCircuiting, public WithStmtsToAdd {
154 Expression * postmutate( MemberExpr * memberExpr );
155
156 void premutate( ApplicationExpr * appExpr );
157 void premutate( AddressExpr * addrExpr );
158
159 template<typename AggrInst>
160 Expression * fixMemberExpr( AggrInst * inst, MemberExpr * memberExpr );
161
162 bool isLvalueArg = false;
163 };
164
165 /// Mutator pass that replaces concrete instantiations of generic types with actual struct declarations, scoped appropriately
166 struct GenericInstantiator final : public WithTypeSubstitution, public WithDeclsToAdd, public WithVisitorRef<GenericInstantiator>, public WithGuards {
167 /// Map of (generic type, parameter list) pairs to concrete type instantiations
168 InstantiationMap< AggregateDecl, AggregateDecl > instantiations;
169 /// Set of types which are dtype-only generic (and therefore have static layout)
170 ScopedSet< AggregateDecl* > dtypeStatics;
171 /// Namer for concrete types
172 UniqueName typeNamer;
173 /// Should not make use of type environment to replace types of function parameter and return values.
174 bool inFunctionType = false;
175 /// Index of current member, used to recreate MemberExprs with the member from an instantiation
176 int memberIndex = -1;
177 GenericInstantiator() : instantiations(), dtypeStatics(), typeNamer("_conc_") {}
178
179 Type* postmutate( StructInstType *inst );
180 Type* postmutate( UnionInstType *inst );
181
182 // fix MemberExprs to use the member from the instantiation
183 void premutate( MemberExpr * memberExpr );
184 Expression * postmutate( MemberExpr * memberExpr );
185
186 void premutate( FunctionType * ) {
187 GuardValue( inFunctionType );
188 inFunctionType = true;
189 }
190
191 void beginScope();
192 void endScope();
193 private:
194 /// Wrap instantiation lookup for structs
195 StructDecl* lookup( StructInstType *inst, const std::list< TypeExpr* > &typeSubs ) { return (StructDecl*)instantiations.lookup( inst->get_baseStruct(), typeSubs ); }
196 /// Wrap instantiation lookup for unions
197 UnionDecl* lookup( UnionInstType *inst, const std::list< TypeExpr* > &typeSubs ) { return (UnionDecl*)instantiations.lookup( inst->get_baseUnion(), typeSubs ); }
198 /// Wrap instantiation insertion for structs
199 void insert( StructInstType *inst, const std::list< TypeExpr* > &typeSubs, StructDecl *decl ) { instantiations.insert( inst->get_baseStruct(), typeSubs, decl ); }
200 /// Wrap instantiation insertion for unions
201 void insert( UnionInstType *inst, const std::list< TypeExpr* > &typeSubs, UnionDecl *decl ) { instantiations.insert( inst->get_baseUnion(), typeSubs, decl ); }
202
203 void replaceParametersWithConcrete( std::list< Expression* >& params );
204 Type *replaceWithConcrete( Type *type, bool doClone );
205
206 /// Strips a dtype-static aggregate decl of its type parameters, marks it as stripped
207 void stripDtypeParams( AggregateDecl *base, std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs );
208 };
209
210 void instantiateGeneric( std::list< Declaration* > &translationUnit ) {
211 PassVisitor<FixDtypeStatic> fixer;
212 PassVisitor<GenericInstantiator> instantiator;
213
214 mutateAll( translationUnit, fixer );
215 mutateAll( translationUnit, instantiator );
216 }
217
218 bool isDtypeStatic( const std::list< TypeDecl* >& baseParams ) {
219 return std::all_of( baseParams.begin(), baseParams.end(), []( TypeDecl * td ) { return ! td->isComplete(); } );
220 }
221
222 /// Makes substitutions of params into baseParams; returns dtypeStatic if there is a concrete instantiation based only on {d,f}type-to-void conversions,
223 /// concrete if there is a concrete instantiation requiring at least one parameter type, and dynamic if there is no concrete instantiation
224 genericType makeSubstitutions( const std::list< TypeDecl* >& baseParams, const std::list< Expression* >& params, std::list< TypeExpr* >& out ) {
225 genericType gt = genericType::dtypeStatic;
226
227 // substitute concrete types for given parameters, and incomplete types for placeholders
228 std::list< TypeDecl* >::const_iterator baseParam = baseParams.begin();
229 std::list< Expression* >::const_iterator param = params.begin();
230 for ( ; baseParam != baseParams.end() && param != params.end(); ++baseParam, ++param ) {
231 TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
232 assert(paramType && "Aggregate parameters should be type expressions");
233
234 if ( (*baseParam)->isComplete() ) {
235 // substitute parameter for complete (otype or sized dtype) type
236 if ( isPolyType( paramType->get_type() ) ) {
237 // substitute polymorphic parameter type in to generic type
238 out.push_back( paramType->clone() );
239 gt = genericType::dynamic;
240 } else {
241 // normalize possibly dtype-static parameter type
242 out.push_back( new TypeExpr{
243 ScrubTyVars::scrubAll( paramType->get_type()->clone() ) } );
244 gt |= genericType::concrete;
245 }
246 } else switch ( (*baseParam)->get_kind() ) {
247 case TypeDecl::Dtype:
248 // can pretend that any incomplete dtype is `void`
249 out.push_back( new TypeExpr( new VoidType( Type::Qualifiers() ) ) );
250 break;
251 case TypeDecl::Ftype:
252 // can pretend that any ftype is `void (*)(void)`
253 out.push_back( new TypeExpr( new FunctionType( Type::Qualifiers(), false ) ) );
254 break;
255 case TypeDecl::Ttype:
256 assertf( false, "Ttype parameters are not currently allowed as parameters to generic types." );
257 break;
258 default:
259 assertf( false, "Unhandled type parameter kind" );
260 break;
261 }
262 }
263
264 assertf( baseParam == baseParams.end() && param == params.end(), "Type parameters should match type variables" );
265 return gt;
266 }
267
268 /// Substitutes types of members of in according to baseParams => typeSubs, appending the result to out
269 void substituteMembers( const std::list< Declaration* >& in, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs,
270 std::list< Declaration* >& out ) {
271 // substitute types into new members
272 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
273 for ( std::list< Declaration* >::const_iterator member = in.begin(); member != in.end(); ++member ) {
274 Declaration *newMember = (*member)->clone();
275 subs.apply(newMember);
276 out.push_back( newMember );
277 }
278 }
279
280 /// Substitutes types of members according to baseParams => typeSubs, working in-place
281 void substituteMembers( std::list< Declaration* >& members, const std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs ) {
282 // substitute types into new members
283 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
284 for ( std::list< Declaration* >::iterator member = members.begin(); member != members.end(); ++member ) {
285 subs.apply(*member);
286 }
287 }
288
289 /// Strips the instances's type parameters
290 void stripInstParams( ReferenceToType *inst ) {
291 inst->get_parameters().clear();
292 }
293
294 void GenericInstantiator::stripDtypeParams( AggregateDecl *base, std::list< TypeDecl* >& baseParams, const std::list< TypeExpr* >& typeSubs ) {
295 substituteMembers( base->get_members(), baseParams, typeSubs );
296
297 baseParams.clear();
298
299 dtypeStatics.insert( base );
300 }
301
302 /// xxx - more or less copied from box -- these should be merged with those somehow...
303 void GenericInstantiator::replaceParametersWithConcrete( std::list< Expression* >& params ) {
304 for ( std::list< Expression* >::iterator param = params.begin(); param != params.end(); ++param ) {
305 TypeExpr *paramType = dynamic_cast< TypeExpr* >( *param );
306 assertf(paramType, "Aggregate parameters should be type expressions");
307 paramType->set_type( replaceWithConcrete( paramType->get_type(), false ) );
308 }
309 }
310
311 Type *GenericInstantiator::replaceWithConcrete( Type *type, bool doClone ) {
312 if ( TypeInstType *typeInst = dynamic_cast< TypeInstType * >( type ) ) {
313 if ( env && ! inFunctionType ) {
314 Type *concrete = env->lookup( typeInst->get_name() );
315 if ( concrete ) {
316 return concrete->clone();
317 }
318 else return typeInst->clone();
319 }
320 } else if ( StructInstType *structType = dynamic_cast< StructInstType* >( type ) ) {
321 if ( doClone ) {
322 structType = structType->clone();
323 }
324 replaceParametersWithConcrete( structType->get_parameters() );
325 return structType;
326 } else if ( UnionInstType *unionType = dynamic_cast< UnionInstType* >( type ) ) {
327 if ( doClone ) {
328 unionType = unionType->clone();
329 }
330 replaceParametersWithConcrete( unionType->get_parameters() );
331 return unionType;
332 }
333 return type;
334 }
335
336
337 Type* GenericInstantiator::postmutate( StructInstType *inst ) {
338 // exit early if no need for further mutation
339 if ( inst->get_parameters().empty() ) return inst;
340
341 // 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).
342 replaceWithConcrete( inst, false );
343
344 // check for an already-instantiatiated dtype-static type
345 if ( dtypeStatics.find( inst->get_baseStruct() ) != dtypeStatics.end() ) {
346 stripInstParams( inst );
347 return inst;
348 }
349
350 // check if type can be concretely instantiated; put substitutions into typeSubs
351 assertf( inst->get_baseParameters(), "Base struct has parameters" );
352 std::list< TypeExpr* > typeSubs;
353 genericType gt = makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs );
354 switch ( gt ) {
355 case genericType::dtypeStatic:
356 stripDtypeParams( inst->get_baseStruct(), *inst->get_baseParameters(), typeSubs );
357 stripInstParams( inst );
358 break;
359
360 case genericType::concrete: {
361 // make concrete instantiation of generic type
362 StructDecl *concDecl = lookup( inst, typeSubs );
363 if ( ! concDecl ) {
364 // set concDecl to new type, insert type declaration into statements to add
365 concDecl = new StructDecl( typeNamer.newName( inst->get_name() ) );
366 concDecl->set_body( inst->get_baseStruct()->has_body() );
367 substituteMembers( inst->get_baseStruct()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
368 insert( inst, typeSubs, concDecl ); // must insert before recursion
369 concDecl->acceptMutator( *visitor ); // recursively instantiate members
370 declsToAddBefore.push_back( concDecl ); // must occur before declaration is added so that member instantiations appear first
371 }
372 StructInstType *newInst = new StructInstType( inst->get_qualifiers(), concDecl->get_name() );
373 newInst->set_baseStruct( concDecl );
374
375 inst = newInst;
376 break;
377 }
378
379 case genericType::dynamic:
380 // do nothing
381 break;
382 }
383
384 return inst;
385 }
386
387 Type* GenericInstantiator::postmutate( UnionInstType *inst ) {
388 // exit early if no need for further mutation
389 if ( inst->get_parameters().empty() ) return inst;
390
391 // check for an already-instantiatiated dtype-static type
392 if ( dtypeStatics.find( inst->get_baseUnion() ) != dtypeStatics.end() ) {
393 stripInstParams( inst );
394 return inst;
395 }
396
397 // check if type can be concretely instantiated; put substitutions into typeSubs
398 assert( inst->get_baseParameters() && "Base union has parameters" );
399 std::list< TypeExpr* > typeSubs;
400 genericType gt = makeSubstitutions( *inst->get_baseParameters(), inst->get_parameters(), typeSubs );
401 switch ( gt ) {
402 case genericType::dtypeStatic:
403 stripDtypeParams( inst->get_baseUnion(), *inst->get_baseParameters(), typeSubs );
404 stripInstParams( inst );
405 break;
406
407 case genericType::concrete:
408 {
409 // make concrete instantiation of generic type
410 UnionDecl *concDecl = lookup( inst, typeSubs );
411 if ( ! concDecl ) {
412 // set concDecl to new type, insert type declaration into statements to add
413 concDecl = new UnionDecl( typeNamer.newName( inst->get_name() ) );
414 concDecl->set_body( inst->get_baseUnion()->has_body() );
415 substituteMembers( inst->get_baseUnion()->get_members(), *inst->get_baseParameters(), typeSubs, concDecl->get_members() );
416 insert( inst, typeSubs, concDecl ); // must insert before recursion
417 concDecl->acceptMutator( *visitor ); // recursively instantiate members
418 declsToAddBefore.push_back( concDecl ); // must occur before declaration is added so that member instantiations appear first
419 }
420 UnionInstType *newInst = new UnionInstType( inst->get_qualifiers(), concDecl->get_name() );
421 newInst->set_baseUnion( concDecl );
422
423 inst = newInst;
424 break;
425 }
426 case genericType::dynamic:
427 // do nothing
428 break;
429 }
430
431 return inst;
432 }
433
434 namespace {
435 bool isGenericType( Type * t ) {
436 if ( StructInstType * inst = dynamic_cast< StructInstType * >( t ) ) {
437 return ! inst->parameters.empty();
438 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( t ) ) {
439 return ! inst->parameters.empty();
440 }
441 return false;
442 }
443 }
444
445 void GenericInstantiator::premutate( MemberExpr * memberExpr ) {
446 GuardValue( memberIndex );
447 memberIndex = -1;
448 if ( isGenericType( memberExpr->aggregate->result ) ) {
449 // find the location of the member
450 AggregateDecl * aggr = memberExpr->aggregate->result->getAggr();
451 std::list< Declaration * > & members = aggr->members;
452 memberIndex = std::distance( members.begin(), std::find( members.begin(), members.end(), memberExpr->member ) );
453 assertf( memberIndex < (int)members.size(), "Could not find member %s in generic type %s", toString( memberExpr->member ).c_str(), toString( memberExpr->aggregate ).c_str() );
454 }
455 }
456
457 Expression * GenericInstantiator::postmutate( MemberExpr * memberExpr ) {
458 if ( memberIndex != -1 ) {
459 // using the location from the generic type, find the member in the instantiation and rebuild the member expression
460 AggregateDecl * aggr = memberExpr->aggregate->result->getAggr();
461 assertf( memberIndex < (int)aggr->members.size(), "Instantiation somehow has fewer members than the generic type." );
462 Declaration * member = *std::next( aggr->members.begin(), memberIndex );
463 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() );
464 DeclarationWithType * field = strict_dynamic_cast< DeclarationWithType * >( member );
465 MemberExpr * ret = new MemberExpr( field, memberExpr->aggregate->clone() );
466 ResolvExpr::adjustExprType( ret->result ); // pointer decay
467 std::swap( ret->env, memberExpr->env );
468 return ret;
469 }
470 return memberExpr;
471 }
472
473 void GenericInstantiator::beginScope() {
474 instantiations.beginScope();
475 dtypeStatics.beginScope();
476 }
477
478 void GenericInstantiator::endScope() {
479 instantiations.endScope();
480 dtypeStatics.endScope();
481 }
482
483 template< typename AggrInst >
484 Expression * FixDtypeStatic::fixMemberExpr( AggrInst * inst, MemberExpr * memberExpr ) {
485 // need to cast dtype-static member expressions to their actual type before that type is erased.
486 auto & baseParams = *inst->get_baseParameters();
487 if ( isDtypeStatic( baseParams ) ) {
488 if ( ! ResolvExpr::typesCompatible( memberExpr->result, memberExpr->member->get_type(), SymTab::Indexer() ) ) {
489 // type of member and type of expression differ
490 Type * concType = memberExpr->result->clone();
491 if ( isLvalueArg ) {
492 // result must be C lvalue, so make a new reference variable with the correct actual type to replace the member expression
493 // forall(dtype T)
494 // struct Ptr {
495 // T * x
496 // };
497 // Ptr(int) p;
498 // int i;
499 // p.x = &i;
500 // becomes
501 // int *& _dtype_static_member_0 = (int **)&p.x;
502 // _dtype_static_member_0 = &i;
503 // Note: this currently creates more temporaries than is strictly necessary, since it does not check for duplicate uses of the same member expression.
504 static UniqueName tmpNamer( "_dtype_static_member_" );
505 Expression * init = new CastExpr( new AddressExpr( memberExpr ), new PointerType( Type::Qualifiers(), concType->clone() ) );
506 ObjectDecl * tmp = ObjectDecl::newObject( tmpNamer.newName(), new ReferenceType( Type::Qualifiers(), concType ), new SingleInit( init ) );
507 stmtsToAddBefore.push_back( new DeclStmt( tmp ) );
508 return new VariableExpr( tmp );
509 } else {
510 // can simply add a cast to actual type
511 return new CastExpr( memberExpr, concType );
512 }
513 }
514 }
515 return memberExpr;
516 }
517
518 Expression * FixDtypeStatic::postmutate( MemberExpr * memberExpr ) {
519 Type * aggrType = memberExpr->aggregate->result;
520 if ( isGenericType( aggrType ) ) {
521 if ( StructInstType * inst = dynamic_cast< StructInstType * >( aggrType ) ) {
522 return fixMemberExpr( inst, memberExpr );
523 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( aggrType ) ) {
524 return fixMemberExpr( inst, memberExpr );
525 }
526 }
527 return memberExpr;
528 }
529
530 void FixDtypeStatic::premutate( ApplicationExpr * appExpr ) {
531 GuardValue( isLvalueArg );
532 isLvalueArg = false;
533 DeclarationWithType * function = InitTweak::getFunction( appExpr );
534 if ( function->linkage == LinkageSpec::Intrinsic && CodeGen::isAssignment( function->name ) ) {
535 // explicitly visit children because only the first argument must be a C lvalue.
536 visit_children = false;
537 appExpr->env = maybeMutate( appExpr->env, *visitor );
538 appExpr->result = maybeMutate( appExpr->result, *visitor );
539 appExpr->function = maybeMutate( appExpr->function, *visitor );
540 isLvalueArg = true;
541 for ( Expression * arg : appExpr->args ) {
542 arg = maybeMutate( arg, *visitor );
543 isLvalueArg = false;
544 }
545 }
546 }
547
548 void FixDtypeStatic::premutate( AddressExpr * ) {
549 // argument of & must be C lvalue
550 GuardValue( isLvalueArg );
551 isLvalueArg = true;
552 }
553} // namespace GenPoly
554
555// Local Variables: //
556// tab-width: 4 //
557// mode: c++ //
558// compile-command: "make install" //
559// End: //
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