source: src/SymTab/Validate.cc@ 3f12158

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 3f12158 was d24d4e1, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

convert more passes to PassVisitor, fix PassVisitor constructor bug, add WithDeclsToAdd parent class
  • Property mode set to 100644
File size: 36.2 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// Validate.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Sun May 17 21:50:04 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Thu Mar 30 16:50:13 2017
13// Update Count : 357
14//
15
16// The "validate" phase of translation is used to take a syntax tree and convert it into a standard form that aims to be
17// as regular in structure as possible. Some assumptions can be made regarding the state of the tree after this pass is
18// complete, including:
19//
20// - No nested structure or union definitions; any in the input are "hoisted" to the level of the containing struct or
21// union.
22//
23// - All enumeration constants have type EnumInstType.
24//
25// - The type "void" never occurs in lists of function parameter or return types. A function
26// taking no arguments has no argument types.
27//
28// - No context instances exist; they are all replaced by the set of declarations signified by the context, instantiated
29// by the particular set of type arguments.
30//
31// - Every declaration is assigned a unique id.
32//
33// - No typedef declarations or instances exist; the actual type is substituted for each instance.
34//
35// - Each type, struct, and union definition is followed by an appropriate assignment operator.
36//
37// - Each use of a struct or union is connected to a complete definition of that struct or union, even if that
38// definition occurs later in the input.
39
40#include <algorithm>
41#include <iterator>
42#include <list>
43
44#include "CodeGen/CodeGenerator.h"
45
46#include "Common/PassVisitor.h"
47#include "Common/ScopedMap.h"
48#include "Common/UniqueName.h"
49#include "Common/utility.h"
50
51#include "Concurrency/Keywords.h"
52
53#include "GenPoly/DeclMutator.h"
54
55#include "InitTweak/InitTweak.h"
56
57#include "AddVisit.h"
58#include "Autogen.h"
59#include "FixFunction.h"
60// #include "ImplementationType.h"
61#include "Indexer.h"
62#include "MakeLibCfa.h"
63#include "TypeEquality.h"
64#include "Validate.h"
65
66#include "ResolvExpr/typeops.h"
67
68#include "SynTree/Attribute.h"
69#include "SynTree/Expression.h"
70#include "SynTree/Mutator.h"
71#include "SynTree/Statement.h"
72#include "SynTree/Type.h"
73#include "SynTree/TypeSubstitution.h"
74#include "SynTree/Visitor.h"
75
76#define debugPrint( x ) if ( doDebug ) { std::cout << x; }
77
78namespace SymTab {
79 class HoistStruct final : public Visitor {
80 template< typename Visitor >
81 friend void acceptAndAdd( std::list< Declaration * > &translationUnit, Visitor &visitor );
82 template< typename Visitor >
83 friend void addVisitStatementList( std::list< Statement* > &stmts, Visitor &visitor );
84 public:
85 /// Flattens nested struct types
86 static void hoistStruct( std::list< Declaration * > &translationUnit );
87
88 std::list< Declaration * > &get_declsToAdd() { return declsToAdd; }
89
90 virtual void visit( EnumInstType *enumInstType );
91 virtual void visit( StructInstType *structInstType );
92 virtual void visit( UnionInstType *unionInstType );
93 virtual void visit( StructDecl *aggregateDecl );
94 virtual void visit( UnionDecl *aggregateDecl );
95
96 virtual void visit( CompoundStmt *compoundStmt );
97 virtual void visit( SwitchStmt *switchStmt );
98 private:
99 HoistStruct();
100
101 template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl );
102
103 std::list< Declaration * > declsToAdd, declsToAddAfter;
104 bool inStruct;
105 };
106
107 /// Fix return types so that every function returns exactly one value
108 struct ReturnTypeFixer {
109 static void fix( std::list< Declaration * > &translationUnit );
110
111 void postvisit( FunctionDecl * functionDecl );
112 void postvisit( FunctionType * ftype );
113 };
114
115 /// Replaces enum types by int, and function or array types in function parameter and return lists by appropriate pointers.
116 struct EnumAndPointerDecay {
117 void previsit( EnumDecl *aggregateDecl );
118 void previsit( FunctionType *func );
119 };
120
121 /// Associates forward declarations of aggregates with their definitions
122 class LinkReferenceToTypes final : public Indexer {
123 typedef Indexer Parent;
124 public:
125 LinkReferenceToTypes( bool doDebug, const Indexer *indexer );
126 using Parent::visit;
127 void visit( EnumInstType *enumInst ) final;
128 void visit( StructInstType *structInst ) final;
129 void visit( UnionInstType *unionInst ) final;
130 void visit( TraitInstType *contextInst ) final;
131 void visit( EnumDecl *enumDecl ) final;
132 void visit( StructDecl *structDecl ) final;
133 void visit( UnionDecl *unionDecl ) final;
134 void visit( TypeInstType *typeInst ) final;
135 private:
136 const Indexer *indexer;
137
138 typedef std::map< std::string, std::list< EnumInstType * > > ForwardEnumsType;
139 typedef std::map< std::string, std::list< StructInstType * > > ForwardStructsType;
140 typedef std::map< std::string, std::list< UnionInstType * > > ForwardUnionsType;
141 ForwardEnumsType forwardEnums;
142 ForwardStructsType forwardStructs;
143 ForwardUnionsType forwardUnions;
144 };
145
146 /// Replaces array and function types in forall lists by appropriate pointer type and assigns each Object and Function declaration a unique ID.
147 class ForallPointerDecay final : public Indexer {
148 typedef Indexer Parent;
149 public:
150 using Parent::visit;
151 ForallPointerDecay( const Indexer *indexer );
152
153 virtual void visit( ObjectDecl *object ) override;
154 virtual void visit( FunctionDecl *func ) override;
155
156 const Indexer *indexer;
157 };
158
159 struct ReturnChecker : public WithGuards {
160 /// Checks that return statements return nothing if their return type is void
161 /// and return something if the return type is non-void.
162 static void checkFunctionReturns( std::list< Declaration * > & translationUnit );
163
164 void previsit( FunctionDecl * functionDecl );
165 void previsit( ReturnStmt * returnStmt );
166
167 typedef std::list< DeclarationWithType * > ReturnVals;
168 ReturnVals returnVals;
169 };
170
171 class EliminateTypedef : public Mutator {
172 public:
173 EliminateTypedef() : scopeLevel( 0 ) {}
174 /// Replaces typedefs by forward declarations
175 static void eliminateTypedef( std::list< Declaration * > &translationUnit );
176 private:
177 virtual Declaration *mutate( TypedefDecl *typeDecl );
178 virtual TypeDecl *mutate( TypeDecl *typeDecl );
179 virtual DeclarationWithType *mutate( FunctionDecl *funcDecl );
180 virtual DeclarationWithType *mutate( ObjectDecl *objDecl );
181 virtual CompoundStmt *mutate( CompoundStmt *compoundStmt );
182 virtual Type *mutate( TypeInstType *aggregateUseType );
183 virtual Expression *mutate( CastExpr *castExpr );
184
185 virtual Declaration *mutate( StructDecl * structDecl );
186 virtual Declaration *mutate( UnionDecl * unionDecl );
187 virtual Declaration *mutate( EnumDecl * enumDecl );
188 virtual Declaration *mutate( TraitDecl * contextDecl );
189
190 template<typename AggDecl>
191 AggDecl *handleAggregate( AggDecl * aggDecl );
192
193 template<typename AggDecl>
194 void addImplicitTypedef( AggDecl * aggDecl );
195
196 typedef std::unique_ptr<TypedefDecl> TypedefDeclPtr;
197 typedef ScopedMap< std::string, std::pair< TypedefDeclPtr, int > > TypedefMap;
198 typedef std::map< std::string, TypeDecl * > TypeDeclMap;
199 TypedefMap typedefNames;
200 TypeDeclMap typedeclNames;
201 int scopeLevel;
202 };
203
204 struct VerifyCtorDtorAssign {
205 /// ensure that constructors, destructors, and assignment have at least one
206 /// parameter, the first of which must be a pointer, and that ctor/dtors have no
207 /// return values.
208 static void verify( std::list< Declaration * > &translationUnit );
209
210 void previsit( FunctionDecl *funcDecl );
211 };
212
213 /// ensure that generic types have the correct number of type arguments
214 struct ValidateGenericParameters {
215 void previsit( StructInstType * inst );
216 void previsit( UnionInstType * inst );
217 };
218
219 struct ArrayLength {
220 /// for array types without an explicit length, compute the length and store it so that it
221 /// is known to the rest of the phases. For example,
222 /// int x[] = { 1, 2, 3 };
223 /// int y[][2] = { { 1, 2, 3 }, { 1, 2, 3 } };
224 /// here x and y are known at compile-time to have length 3, so change this into
225 /// int x[3] = { 1, 2, 3 };
226 /// int y[3][2] = { { 1, 2, 3 }, { 1, 2, 3 } };
227 static void computeLength( std::list< Declaration * > & translationUnit );
228
229 void previsit( ObjectDecl * objDecl );
230 };
231
232 struct CompoundLiteral final : public WithDeclsToAdd, public WithVisitorRef<CompoundLiteral> {
233 Type::StorageClasses storageClasses;
234
235 void premutate( ObjectDecl *objectDecl );
236 Expression * postmutate( CompoundLiteralExpr *compLitExpr );
237 };
238
239 void validate( std::list< Declaration * > &translationUnit, bool doDebug ) {
240 PassVisitor<EnumAndPointerDecay> epc;
241 LinkReferenceToTypes lrt( doDebug, 0 );
242 ForallPointerDecay fpd( 0 );
243 PassVisitor<CompoundLiteral> compoundliteral;
244 PassVisitor<ValidateGenericParameters> genericParams;
245
246 EliminateTypedef::eliminateTypedef( translationUnit );
247 HoistStruct::hoistStruct( translationUnit ); // must happen after EliminateTypedef, so that aggregate typedefs occur in the correct order
248 ReturnTypeFixer::fix( translationUnit ); // must happen before autogen
249 acceptAll( translationUnit, lrt ); // must happen before autogen, because sized flag needs to propagate to generated functions
250 acceptAll( translationUnit, genericParams ); // check as early as possible - can't happen before LinkReferenceToTypes
251 acceptAll( translationUnit, epc ); // must happen before VerifyCtorDtorAssign, because void return objects should not exist
252 VerifyCtorDtorAssign::verify( translationUnit ); // must happen before autogen, because autogen examines existing ctor/dtors
253 Concurrency::applyKeywords( translationUnit );
254 autogenerateRoutines( translationUnit ); // moved up, used to be below compoundLiteral - currently needs EnumAndPointerDecay
255 Concurrency::implementMutexFuncs( translationUnit );
256 Concurrency::implementThreadStarter( translationUnit );
257 ReturnChecker::checkFunctionReturns( translationUnit );
258 mutateAll( translationUnit, compoundliteral );
259 acceptAll( translationUnit, fpd );
260 ArrayLength::computeLength( translationUnit );
261 }
262
263 void validateType( Type *type, const Indexer *indexer ) {
264 PassVisitor<EnumAndPointerDecay> epc;
265 LinkReferenceToTypes lrt( false, indexer );
266 ForallPointerDecay fpd( indexer );
267 type->accept( epc );
268 type->accept( lrt );
269 type->accept( fpd );
270 }
271
272 void HoistStruct::hoistStruct( std::list< Declaration * > &translationUnit ) {
273 HoistStruct hoister;
274 acceptAndAdd( translationUnit, hoister );
275 }
276
277 HoistStruct::HoistStruct() : inStruct( false ) {
278 }
279
280 void filter( std::list< Declaration * > &declList, bool (*pred)( Declaration * ), bool doDelete ) {
281 std::list< Declaration * >::iterator i = declList.begin();
282 while ( i != declList.end() ) {
283 std::list< Declaration * >::iterator next = i;
284 ++next;
285 if ( pred( *i ) ) {
286 if ( doDelete ) {
287 delete *i;
288 } // if
289 declList.erase( i );
290 } // if
291 i = next;
292 } // while
293 }
294
295 bool isStructOrUnion( Declaration *decl ) {
296 return dynamic_cast< StructDecl * >( decl ) || dynamic_cast< UnionDecl * >( decl );
297 }
298
299 template< typename AggDecl >
300 void HoistStruct::handleAggregate( AggDecl *aggregateDecl ) {
301 if ( inStruct ) {
302 // Add elements in stack order corresponding to nesting structure.
303 declsToAdd.push_front( aggregateDecl );
304 Visitor::visit( aggregateDecl );
305 } else {
306 inStruct = true;
307 Visitor::visit( aggregateDecl );
308 inStruct = false;
309 } // if
310 // Always remove the hoisted aggregate from the inner structure.
311 filter( aggregateDecl->get_members(), isStructOrUnion, false );
312 }
313
314 void HoistStruct::visit( EnumInstType *structInstType ) {
315 if ( structInstType->get_baseEnum() ) {
316 declsToAdd.push_front( structInstType->get_baseEnum() );
317 }
318 }
319
320 void HoistStruct::visit( StructInstType *structInstType ) {
321 if ( structInstType->get_baseStruct() ) {
322 declsToAdd.push_front( structInstType->get_baseStruct() );
323 }
324 }
325
326 void HoistStruct::visit( UnionInstType *structInstType ) {
327 if ( structInstType->get_baseUnion() ) {
328 declsToAdd.push_front( structInstType->get_baseUnion() );
329 }
330 }
331
332 void HoistStruct::visit( StructDecl *aggregateDecl ) {
333 handleAggregate( aggregateDecl );
334 }
335
336 void HoistStruct::visit( UnionDecl *aggregateDecl ) {
337 handleAggregate( aggregateDecl );
338 }
339
340 void HoistStruct::visit( CompoundStmt *compoundStmt ) {
341 addVisit( compoundStmt, *this );
342 }
343
344 void HoistStruct::visit( SwitchStmt *switchStmt ) {
345 addVisit( switchStmt, *this );
346 }
347
348 void EnumAndPointerDecay::previsit( EnumDecl *enumDecl ) {
349 // Set the type of each member of the enumeration to be EnumConstant
350 for ( std::list< Declaration * >::iterator i = enumDecl->get_members().begin(); i != enumDecl->get_members().end(); ++i ) {
351 ObjectDecl * obj = dynamic_cast< ObjectDecl * >( *i );
352 assert( obj );
353 obj->set_type( new EnumInstType( Type::Qualifiers( Type::Const ), enumDecl->get_name() ) );
354 } // for
355 }
356
357 namespace {
358 template< typename DWTList >
359 void fixFunctionList( DWTList & dwts, FunctionType * func ) {
360 // the only case in which "void" is valid is where it is the only one in the list; then it should be removed
361 // entirely. other fix ups are handled by the FixFunction class
362 typedef typename DWTList::iterator DWTIterator;
363 DWTIterator begin( dwts.begin() ), end( dwts.end() );
364 if ( begin == end ) return;
365 FixFunction fixer;
366 DWTIterator i = begin;
367 *i = (*i)->acceptMutator( fixer );
368 if ( fixer.get_isVoid() ) {
369 DWTIterator j = i;
370 ++i;
371 delete *j;
372 dwts.erase( j );
373 if ( i != end ) {
374 throw SemanticError( "invalid type void in function type ", func );
375 } // if
376 } else {
377 ++i;
378 for ( ; i != end; ++i ) {
379 FixFunction fixer;
380 *i = (*i)->acceptMutator( fixer );
381 if ( fixer.get_isVoid() ) {
382 throw SemanticError( "invalid type void in function type ", func );
383 } // if
384 } // for
385 } // if
386 }
387 }
388
389 void EnumAndPointerDecay::previsit( FunctionType *func ) {
390 // Fix up parameters and return types
391 fixFunctionList( func->get_parameters(), func );
392 fixFunctionList( func->get_returnVals(), func );
393 }
394
395 LinkReferenceToTypes::LinkReferenceToTypes( bool doDebug, const Indexer *other_indexer ) : Indexer( doDebug ) {
396 if ( other_indexer ) {
397 indexer = other_indexer;
398 } else {
399 indexer = this;
400 } // if
401 }
402
403 void LinkReferenceToTypes::visit( EnumInstType *enumInst ) {
404 Parent::visit( enumInst );
405 EnumDecl *st = indexer->lookupEnum( enumInst->get_name() );
406 // it's not a semantic error if the enum is not found, just an implicit forward declaration
407 if ( st ) {
408 //assert( ! enumInst->get_baseEnum() || enumInst->get_baseEnum()->get_members().empty() || ! st->get_members().empty() );
409 enumInst->set_baseEnum( st );
410 } // if
411 if ( ! st || st->get_members().empty() ) {
412 // use of forward declaration
413 forwardEnums[ enumInst->get_name() ].push_back( enumInst );
414 } // if
415 }
416
417 void LinkReferenceToTypes::visit( StructInstType *structInst ) {
418 Parent::visit( structInst );
419 StructDecl *st = indexer->lookupStruct( structInst->get_name() );
420 // it's not a semantic error if the struct is not found, just an implicit forward declaration
421 if ( st ) {
422 //assert( ! structInst->get_baseStruct() || structInst->get_baseStruct()->get_members().empty() || ! st->get_members().empty() );
423 structInst->set_baseStruct( st );
424 } // if
425 if ( ! st || st->get_members().empty() ) {
426 // use of forward declaration
427 forwardStructs[ structInst->get_name() ].push_back( structInst );
428 } // if
429 }
430
431 void LinkReferenceToTypes::visit( UnionInstType *unionInst ) {
432 Parent::visit( unionInst );
433 UnionDecl *un = indexer->lookupUnion( unionInst->get_name() );
434 // it's not a semantic error if the union is not found, just an implicit forward declaration
435 if ( un ) {
436 unionInst->set_baseUnion( un );
437 } // if
438 if ( ! un || un->get_members().empty() ) {
439 // use of forward declaration
440 forwardUnions[ unionInst->get_name() ].push_back( unionInst );
441 } // if
442 }
443
444 void LinkReferenceToTypes::visit( TraitInstType *traitInst ) {
445 Parent::visit( traitInst );
446 if ( traitInst->get_name() == "sized" ) {
447 // "sized" is a special trait with no members - just flick the sized status on for the type variable
448 if ( traitInst->get_parameters().size() != 1 ) {
449 throw SemanticError( "incorrect number of trait parameters: ", traitInst );
450 }
451 TypeExpr * param = safe_dynamic_cast< TypeExpr * > ( traitInst->get_parameters().front() );
452 TypeInstType * inst = safe_dynamic_cast< TypeInstType * > ( param->get_type() );
453 TypeDecl * decl = inst->get_baseType();
454 decl->set_sized( true );
455 // since "sized" is special, the next few steps don't apply
456 return;
457 }
458 TraitDecl *traitDecl = indexer->lookupTrait( traitInst->get_name() );
459 if ( ! traitDecl ) {
460 throw SemanticError( "use of undeclared trait " + traitInst->get_name() );
461 } // if
462 if ( traitDecl->get_parameters().size() != traitInst->get_parameters().size() ) {
463 throw SemanticError( "incorrect number of trait parameters: ", traitInst );
464 } // if
465
466 for ( TypeDecl * td : traitDecl->get_parameters() ) {
467 for ( DeclarationWithType * assert : td->get_assertions() ) {
468 traitInst->get_members().push_back( assert->clone() );
469 } // for
470 } // for
471
472 // need to clone members of the trait for ownership purposes
473 std::list< Declaration * > members;
474 std::transform( traitDecl->get_members().begin(), traitDecl->get_members().end(), back_inserter( members ), [](Declaration * dwt) { return dwt->clone(); } );
475
476 applySubstitution( traitDecl->get_parameters().begin(), traitDecl->get_parameters().end(), traitInst->get_parameters().begin(), members.begin(), members.end(), back_inserter( traitInst->get_members() ) );
477
478 // need to carry over the 'sized' status of each decl in the instance
479 for ( auto p : group_iterate( traitDecl->get_parameters(), traitInst->get_parameters() ) ) {
480 TypeExpr * expr = safe_dynamic_cast< TypeExpr * >( std::get<1>(p) );
481 if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( expr->get_type() ) ) {
482 TypeDecl * formalDecl = std::get<0>(p);
483 TypeDecl * instDecl = inst->get_baseType();
484 if ( formalDecl->get_sized() ) instDecl->set_sized( true );
485 }
486 }
487 }
488
489 void LinkReferenceToTypes::visit( EnumDecl *enumDecl ) {
490 // visit enum members first so that the types of self-referencing members are updated properly
491 Parent::visit( enumDecl );
492 if ( ! enumDecl->get_members().empty() ) {
493 ForwardEnumsType::iterator fwds = forwardEnums.find( enumDecl->get_name() );
494 if ( fwds != forwardEnums.end() ) {
495 for ( std::list< EnumInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
496 (*inst )->set_baseEnum( enumDecl );
497 } // for
498 forwardEnums.erase( fwds );
499 } // if
500 } // if
501 }
502
503 void LinkReferenceToTypes::visit( StructDecl *structDecl ) {
504 // visit struct members first so that the types of self-referencing members are updated properly
505 // xxx - need to ensure that type parameters match up between forward declarations and definition (most importantly, number of type parameters and and their defaults)
506 Parent::visit( structDecl );
507 if ( ! structDecl->get_members().empty() ) {
508 ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->get_name() );
509 if ( fwds != forwardStructs.end() ) {
510 for ( std::list< StructInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
511 (*inst )->set_baseStruct( structDecl );
512 } // for
513 forwardStructs.erase( fwds );
514 } // if
515 } // if
516 }
517
518 void LinkReferenceToTypes::visit( UnionDecl *unionDecl ) {
519 Parent::visit( unionDecl );
520 if ( ! unionDecl->get_members().empty() ) {
521 ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->get_name() );
522 if ( fwds != forwardUnions.end() ) {
523 for ( std::list< UnionInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
524 (*inst )->set_baseUnion( unionDecl );
525 } // for
526 forwardUnions.erase( fwds );
527 } // if
528 } // if
529 }
530
531 void LinkReferenceToTypes::visit( TypeInstType *typeInst ) {
532 if ( NamedTypeDecl *namedTypeDecl = lookupType( typeInst->get_name() ) ) {
533 if ( TypeDecl *typeDecl = dynamic_cast< TypeDecl * >( namedTypeDecl ) ) {
534 typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype );
535 } // if
536 } // if
537 }
538
539 ForallPointerDecay::ForallPointerDecay( const Indexer *other_indexer ) : Indexer( false ) {
540 if ( other_indexer ) {
541 indexer = other_indexer;
542 } else {
543 indexer = this;
544 } // if
545 }
546
547 /// Fix up assertions - flattens assertion lists, removing all trait instances
548 void forallFixer( Type * func ) {
549 for ( TypeDecl * type : func->get_forall() ) {
550 std::list< DeclarationWithType * > toBeDone, nextRound;
551 toBeDone.splice( toBeDone.end(), type->get_assertions() );
552 while ( ! toBeDone.empty() ) {
553 for ( DeclarationWithType * assertion : toBeDone ) {
554 if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) {
555 // expand trait instance into all of its members
556 for ( Declaration * member : traitInst->get_members() ) {
557 DeclarationWithType *dwt = safe_dynamic_cast< DeclarationWithType * >( member );
558 nextRound.push_back( dwt->clone() );
559 }
560 delete traitInst;
561 } else {
562 // pass assertion through
563 FixFunction fixer;
564 assertion = assertion->acceptMutator( fixer );
565 if ( fixer.get_isVoid() ) {
566 throw SemanticError( "invalid type void in assertion of function ", func );
567 }
568 type->get_assertions().push_back( assertion );
569 } // if
570 } // for
571 toBeDone.clear();
572 toBeDone.splice( toBeDone.end(), nextRound );
573 } // while
574 } // for
575 }
576
577 void ForallPointerDecay::visit( ObjectDecl *object ) {
578 forallFixer( object->get_type() );
579 if ( PointerType *pointer = dynamic_cast< PointerType * >( object->get_type() ) ) {
580 forallFixer( pointer->get_base() );
581 } // if
582 Parent::visit( object );
583 object->fixUniqueId();
584 }
585
586 void ForallPointerDecay::visit( FunctionDecl *func ) {
587 forallFixer( func->get_type() );
588 Parent::visit( func );
589 func->fixUniqueId();
590 }
591
592 void ReturnChecker::checkFunctionReturns( std::list< Declaration * > & translationUnit ) {
593 PassVisitor<ReturnChecker> checker;
594 acceptAll( translationUnit, checker );
595 }
596
597 void ReturnChecker::previsit( FunctionDecl * functionDecl ) {
598 GuardValue( returnVals );
599 returnVals = functionDecl->get_functionType()->get_returnVals();
600 }
601
602 void ReturnChecker::previsit( ReturnStmt * returnStmt ) {
603 // Previously this also checked for the existence of an expr paired with no return values on
604 // the function return type. This is incorrect, since you can have an expression attached to
605 // a return statement in a void-returning function in C. The expression is treated as if it
606 // were cast to void.
607 if ( returnStmt->get_expr() == NULL && returnVals.size() != 0 ) {
608 throw SemanticError( "Non-void function returns no values: " , returnStmt );
609 }
610 }
611
612
613 bool isTypedef( Declaration *decl ) {
614 return dynamic_cast< TypedefDecl * >( decl );
615 }
616
617 void EliminateTypedef::eliminateTypedef( std::list< Declaration * > &translationUnit ) {
618 EliminateTypedef eliminator;
619 mutateAll( translationUnit, eliminator );
620 if ( eliminator.typedefNames.count( "size_t" ) ) {
621 // grab and remember declaration of size_t
622 SizeType = eliminator.typedefNames["size_t"].first->get_base()->clone();
623 } else {
624 // xxx - missing global typedef for size_t - default to long unsigned int, even though that may be wrong
625 // eventually should have a warning for this case.
626 SizeType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
627 }
628 filter( translationUnit, isTypedef, true );
629
630 }
631
632 Type *EliminateTypedef::mutate( TypeInstType * typeInst ) {
633 // instances of typedef types will come here. If it is an instance
634 // of a typdef type, link the instance to its actual type.
635 TypedefMap::const_iterator def = typedefNames.find( typeInst->get_name() );
636 if ( def != typedefNames.end() ) {
637 Type *ret = def->second.first->get_base()->clone();
638 ret->get_qualifiers() |= typeInst->get_qualifiers();
639 // place instance parameters on the typedef'd type
640 if ( ! typeInst->get_parameters().empty() ) {
641 ReferenceToType *rtt = dynamic_cast<ReferenceToType*>(ret);
642 if ( ! rtt ) {
643 throw SemanticError("cannot apply type parameters to base type of " + typeInst->get_name());
644 }
645 rtt->get_parameters().clear();
646 cloneAll( typeInst->get_parameters(), rtt->get_parameters() );
647 mutateAll( rtt->get_parameters(), *this ); // recursively fix typedefs on parameters
648 } // if
649 delete typeInst;
650 return ret;
651 } else {
652 TypeDeclMap::const_iterator base = typedeclNames.find( typeInst->get_name() );
653 assertf( base != typedeclNames.end(), "Can't find typedecl name %s", typeInst->get_name().c_str() );
654 typeInst->set_baseType( base->second );
655 } // if
656 return typeInst;
657 }
658
659 Declaration *EliminateTypedef::mutate( TypedefDecl * tyDecl ) {
660 Declaration *ret = Mutator::mutate( tyDecl );
661
662 if ( typedefNames.count( tyDecl->get_name() ) == 1 && typedefNames[ tyDecl->get_name() ].second == scopeLevel ) {
663 // typedef to the same name from the same scope
664 // must be from the same type
665
666 Type * t1 = tyDecl->get_base();
667 Type * t2 = typedefNames[ tyDecl->get_name() ].first->get_base();
668 if ( ! ResolvExpr::typesCompatible( t1, t2, Indexer() ) ) {
669 throw SemanticError( "cannot redefine typedef: " + tyDecl->get_name() );
670 }
671 } else {
672 typedefNames[ tyDecl->get_name() ] = std::make_pair( TypedefDeclPtr( tyDecl ), scopeLevel );
673 } // if
674
675 // When a typedef is a forward declaration:
676 // typedef struct screen SCREEN;
677 // the declaration portion must be retained:
678 // struct screen;
679 // because the expansion of the typedef is:
680 // void rtn( SCREEN *p ) => void rtn( struct screen *p )
681 // hence the type-name "screen" must be defined.
682 // Note, qualifiers on the typedef are superfluous for the forward declaration.
683
684 Type *designatorType = tyDecl->get_base()->stripDeclarator();
685 if ( StructInstType *aggDecl = dynamic_cast< StructInstType * >( designatorType ) ) {
686 return new StructDecl( aggDecl->get_name() );
687 } else if ( UnionInstType *aggDecl = dynamic_cast< UnionInstType * >( designatorType ) ) {
688 return new UnionDecl( aggDecl->get_name() );
689 } else if ( EnumInstType *enumDecl = dynamic_cast< EnumInstType * >( designatorType ) ) {
690 return new EnumDecl( enumDecl->get_name() );
691 } else {
692 return ret->clone();
693 } // if
694 }
695
696 TypeDecl *EliminateTypedef::mutate( TypeDecl * typeDecl ) {
697 TypedefMap::iterator i = typedefNames.find( typeDecl->get_name() );
698 if ( i != typedefNames.end() ) {
699 typedefNames.erase( i ) ;
700 } // if
701
702 typedeclNames[ typeDecl->get_name() ] = typeDecl;
703 return Mutator::mutate( typeDecl );
704 }
705
706 DeclarationWithType *EliminateTypedef::mutate( FunctionDecl * funcDecl ) {
707 typedefNames.beginScope();
708 DeclarationWithType *ret = Mutator::mutate( funcDecl );
709 typedefNames.endScope();
710 return ret;
711 }
712
713 DeclarationWithType *EliminateTypedef::mutate( ObjectDecl * objDecl ) {
714 typedefNames.beginScope();
715 DeclarationWithType *ret = Mutator::mutate( objDecl );
716 typedefNames.endScope();
717
718 if ( FunctionType *funtype = dynamic_cast<FunctionType *>( ret->get_type() ) ) { // function type?
719 // replace the current object declaration with a function declaration
720 FunctionDecl * newDecl = new FunctionDecl( ret->get_name(), ret->get_storageClasses(), ret->get_linkage(), funtype, 0, objDecl->get_attributes(), ret->get_funcSpec() );
721 objDecl->get_attributes().clear();
722 objDecl->set_type( nullptr );
723 delete objDecl;
724 return newDecl;
725 } // if
726 return ret;
727 }
728
729 Expression *EliminateTypedef::mutate( CastExpr * castExpr ) {
730 typedefNames.beginScope();
731 Expression *ret = Mutator::mutate( castExpr );
732 typedefNames.endScope();
733 return ret;
734 }
735
736 CompoundStmt *EliminateTypedef::mutate( CompoundStmt * compoundStmt ) {
737 typedefNames.beginScope();
738 scopeLevel += 1;
739 CompoundStmt *ret = Mutator::mutate( compoundStmt );
740 scopeLevel -= 1;
741 std::list< Statement * >::iterator i = compoundStmt->get_kids().begin();
742 while ( i != compoundStmt->get_kids().end() ) {
743 std::list< Statement * >::iterator next = i+1;
744 if ( DeclStmt *declStmt = dynamic_cast< DeclStmt * >( *i ) ) {
745 if ( dynamic_cast< TypedefDecl * >( declStmt->get_decl() ) ) {
746 delete *i;
747 compoundStmt->get_kids().erase( i );
748 } // if
749 } // if
750 i = next;
751 } // while
752 typedefNames.endScope();
753 return ret;
754 }
755
756 // there may be typedefs nested within aggregates. in order for everything to work properly, these should be removed
757 // as well
758 template<typename AggDecl>
759 AggDecl *EliminateTypedef::handleAggregate( AggDecl * aggDecl ) {
760 std::list<Declaration *>::iterator it = aggDecl->get_members().begin();
761 for ( ; it != aggDecl->get_members().end(); ) {
762 std::list< Declaration * >::iterator next = it+1;
763 if ( dynamic_cast< TypedefDecl * >( *it ) ) {
764 delete *it;
765 aggDecl->get_members().erase( it );
766 } // if
767 it = next;
768 }
769 return aggDecl;
770 }
771
772 template<typename AggDecl>
773 void EliminateTypedef::addImplicitTypedef( AggDecl * aggDecl ) {
774 if ( typedefNames.count( aggDecl->get_name() ) == 0 ) {
775 Type *type = nullptr;
776 if ( StructDecl * newDeclStructDecl = dynamic_cast< StructDecl * >( aggDecl ) ) {
777 type = new StructInstType( Type::Qualifiers(), newDeclStructDecl->get_name() );
778 } else if ( UnionDecl * newDeclUnionDecl = dynamic_cast< UnionDecl * >( aggDecl ) ) {
779 type = new UnionInstType( Type::Qualifiers(), newDeclUnionDecl->get_name() );
780 } else if ( EnumDecl * newDeclEnumDecl = dynamic_cast< EnumDecl * >( aggDecl ) ) {
781 type = new EnumInstType( Type::Qualifiers(), newDeclEnumDecl->get_name() );
782 } // if
783 TypedefDeclPtr tyDecl( new TypedefDecl( aggDecl->get_name(), Type::StorageClasses(), type ) );
784 typedefNames[ aggDecl->get_name() ] = std::make_pair( std::move( tyDecl ), scopeLevel );
785 } // if
786 }
787
788 Declaration *EliminateTypedef::mutate( StructDecl * structDecl ) {
789 addImplicitTypedef( structDecl );
790 Mutator::mutate( structDecl );
791 return handleAggregate( structDecl );
792 }
793
794 Declaration *EliminateTypedef::mutate( UnionDecl * unionDecl ) {
795 addImplicitTypedef( unionDecl );
796 Mutator::mutate( unionDecl );
797 return handleAggregate( unionDecl );
798 }
799
800 Declaration *EliminateTypedef::mutate( EnumDecl * enumDecl ) {
801 addImplicitTypedef( enumDecl );
802 Mutator::mutate( enumDecl );
803 return handleAggregate( enumDecl );
804 }
805
806 Declaration *EliminateTypedef::mutate( TraitDecl * contextDecl ) {
807 Mutator::mutate( contextDecl );
808 return handleAggregate( contextDecl );
809 }
810
811 void VerifyCtorDtorAssign::verify( std::list< Declaration * > & translationUnit ) {
812 PassVisitor<VerifyCtorDtorAssign> verifier;
813 acceptAll( translationUnit, verifier );
814 }
815
816 void VerifyCtorDtorAssign::previsit( FunctionDecl * funcDecl ) {
817 FunctionType * funcType = funcDecl->get_functionType();
818 std::list< DeclarationWithType * > &returnVals = funcType->get_returnVals();
819 std::list< DeclarationWithType * > &params = funcType->get_parameters();
820
821 if ( InitTweak::isCtorDtorAssign( funcDecl->get_name() ) ) {
822 if ( params.size() == 0 ) {
823 throw SemanticError( "Constructors, destructors, and assignment functions require at least one parameter ", funcDecl );
824 }
825 PointerType * ptrType = dynamic_cast< PointerType * >( params.front()->get_type() );
826 if ( ! ptrType || ptrType->is_array() ) {
827 throw SemanticError( "First parameter of a constructor, destructor, or assignment function must be a pointer ", funcDecl );
828 }
829 if ( InitTweak::isCtorDtor( funcDecl->get_name() ) && returnVals.size() != 0 ) {
830 throw SemanticError( "Constructors and destructors cannot have explicit return values ", funcDecl );
831 }
832 }
833 }
834
835 template< typename Aggr >
836 void validateGeneric( Aggr * inst ) {
837 std::list< TypeDecl * > * params = inst->get_baseParameters();
838 if ( params != NULL ) {
839 std::list< Expression * > & args = inst->get_parameters();
840
841 // insert defaults arguments when a type argument is missing (currently only supports missing arguments at the end of the list).
842 // A substitution is used to ensure that defaults are replaced correctly, e.g.,
843 // forall(otype T, otype alloc = heap_allocator(T)) struct vector;
844 // vector(int) v;
845 // after insertion of default values becomes
846 // vector(int, heap_allocator(T))
847 // and the substitution is built with T=int so that after substitution, the result is
848 // vector(int, heap_allocator(int))
849 TypeSubstitution sub;
850 auto paramIter = params->begin();
851 for ( size_t i = 0; paramIter != params->end(); ++paramIter, ++i ) {
852 if ( i < args.size() ) {
853 TypeExpr * expr = safe_dynamic_cast< TypeExpr * >( *std::next( args.begin(), i ) );
854 sub.add( (*paramIter)->get_name(), expr->get_type()->clone() );
855 } else if ( i == args.size() ) {
856 Type * defaultType = (*paramIter)->get_init();
857 if ( defaultType ) {
858 args.push_back( new TypeExpr( defaultType->clone() ) );
859 sub.add( (*paramIter)->get_name(), defaultType->clone() );
860 }
861 }
862 }
863
864 sub.apply( inst );
865 if ( args.size() < params->size() ) throw SemanticError( "Too few type arguments in generic type ", inst );
866 if ( args.size() > params->size() ) throw SemanticError( "Too many type arguments in generic type ", inst );
867 }
868 }
869
870 void ValidateGenericParameters::previsit( StructInstType * inst ) {
871 validateGeneric( inst );
872 }
873
874 void ValidateGenericParameters::previsit( UnionInstType * inst ) {
875 validateGeneric( inst );
876 }
877
878 void CompoundLiteral::premutate( ObjectDecl *objectDecl ) {
879 storageClasses = objectDecl->get_storageClasses();
880 }
881
882 Expression *CompoundLiteral::postmutate( CompoundLiteralExpr *compLitExpr ) {
883 // transform [storage_class] ... (struct S){ 3, ... };
884 // into [storage_class] struct S temp = { 3, ... };
885 static UniqueName indexName( "_compLit" );
886
887 ObjectDecl *tempvar = new ObjectDecl( indexName.newName(), storageClasses, LinkageSpec::C, nullptr, compLitExpr->get_result(), compLitExpr->get_initializer() );
888 compLitExpr->set_result( nullptr );
889 compLitExpr->set_initializer( nullptr );
890 delete compLitExpr;
891 declsToAddBefore.push_back( tempvar ); // add modified temporary to current block
892 return new VariableExpr( tempvar );
893 }
894
895 void ReturnTypeFixer::fix( std::list< Declaration * > &translationUnit ) {
896 PassVisitor<ReturnTypeFixer> fixer;
897 acceptAll( translationUnit, fixer );
898 }
899
900 void ReturnTypeFixer::postvisit( FunctionDecl * functionDecl ) {
901 FunctionType * ftype = functionDecl->get_functionType();
902 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
903 assertf( retVals.size() == 0 || retVals.size() == 1, "Function %s has too many return values: %d", functionDecl->get_name().c_str(), retVals.size() );
904 if ( retVals.size() == 1 ) {
905 // ensure all function return values have a name - use the name of the function to disambiguate (this also provides a nice bit of help for debugging).
906 // ensure other return values have a name.
907 DeclarationWithType * ret = retVals.front();
908 if ( ret->get_name() == "" ) {
909 ret->set_name( toString( "_retval_", CodeGen::genName( functionDecl ) ) );
910 }
911 ret->get_attributes().push_back( new Attribute( "unused" ) );
912 }
913 }
914
915 void ReturnTypeFixer::postvisit( FunctionType * ftype ) {
916 // xxx - need to handle named return values - this information needs to be saved somehow
917 // so that resolution has access to the names.
918 // Note that this pass needs to happen early so that other passes which look for tuple types
919 // find them in all of the right places, including function return types.
920 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
921 if ( retVals.size() > 1 ) {
922 // generate a single return parameter which is the tuple of all of the return values
923 TupleType * tupleType = safe_dynamic_cast< TupleType * >( ResolvExpr::extractResultType( ftype ) );
924 // ensure return value is not destructed by explicitly creating an empty ListInit node wherein maybeConstruct is false.
925 ObjectDecl * newRet = new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::Cforall, 0, tupleType, new ListInit( std::list<Initializer*>(), noDesignators, false ) );
926 deleteAll( retVals );
927 retVals.clear();
928 retVals.push_back( newRet );
929 }
930 }
931
932 void ArrayLength::computeLength( std::list< Declaration * > & translationUnit ) {
933 PassVisitor<ArrayLength> len;
934 acceptAll( translationUnit, len );
935 }
936
937 void ArrayLength::previsit( ObjectDecl * objDecl ) {
938 if ( ArrayType * at = dynamic_cast< ArrayType * >( objDecl->get_type() ) ) {
939 if ( at->get_dimension() != nullptr ) return;
940 if ( ListInit * init = dynamic_cast< ListInit * >( objDecl->get_init() ) ) {
941 at->set_dimension( new ConstantExpr( Constant::from_ulong( init->get_initializers().size() ) ) );
942 }
943 }
944 }
945} // namespace SymTab
946
947// Local Variables: //
948// tab-width: 4 //
949// mode: c++ //
950// compile-command: "make install" //
951// End: //
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