source: src/SymTab/Validate.cc@ a62cbb3

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 a62cbb3 was 43c89a7, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

add hoistType flag (currently unused)
  • Property mode set to 100644
File size: 32.9 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 Feb 23 21:33:55 2017
13// Update Count : 318
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 <list>
41#include <iterator>
42#include "Common/ScopedMap.h"
43#include "Common/utility.h"
44#include "Common/UniqueName.h"
45#include "Validate.h"
46#include "SynTree/Visitor.h"
47#include "SynTree/Mutator.h"
48#include "SynTree/Type.h"
49#include "SynTree/Expression.h"
50#include "SynTree/Statement.h"
51#include "SynTree/TypeSubstitution.h"
52#include "Indexer.h"
53#include "FixFunction.h"
54// #include "ImplementationType.h"
55#include "GenPoly/DeclMutator.h"
56#include "AddVisit.h"
57#include "MakeLibCfa.h"
58#include "TypeEquality.h"
59#include "Autogen.h"
60#include "ResolvExpr/typeops.h"
61#include <algorithm>
62#include "InitTweak/InitTweak.h"
63#include "CodeGen/CodeGenerator.h"
64
65#define debugPrint( x ) if ( doDebug ) { std::cout << x; }
66
67namespace SymTab {
68 class HoistStruct final : public Visitor {
69 template< typename Visitor >
70 friend void acceptAndAdd( std::list< Declaration * > &translationUnit, Visitor &visitor );
71 template< typename Visitor >
72 friend void addVisitStatementList( std::list< Statement* > &stmts, Visitor &visitor );
73 public:
74 /// Flattens nested struct types
75 static void hoistStruct( std::list< Declaration * > &translationUnit );
76
77 std::list< Declaration * > &get_declsToAdd() { return declsToAdd; }
78
79 virtual void visit( EnumInstType *enumInstType );
80 virtual void visit( StructInstType *structInstType );
81 virtual void visit( UnionInstType *unionInstType );
82 virtual void visit( StructDecl *aggregateDecl );
83 virtual void visit( UnionDecl *aggregateDecl );
84
85 virtual void visit( CompoundStmt *compoundStmt );
86 virtual void visit( SwitchStmt *switchStmt );
87 private:
88 HoistStruct();
89
90 template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl );
91
92 std::list< Declaration * > declsToAdd, declsToAddAfter;
93 bool inStruct;
94 };
95
96 /// Fix return types so that every function returns exactly one value
97 class ReturnTypeFixer final : public Visitor {
98 public:
99
100 typedef Visitor Parent;
101 using Parent::visit;
102
103 static void fix( std::list< Declaration * > &translationUnit );
104
105 virtual void visit( FunctionDecl * functionDecl );
106
107 virtual void visit( FunctionType * ftype );
108 };
109
110 /// Replaces enum types by int, and function or array types in function parameter and return lists by appropriate pointers.
111 class EnumAndPointerDecayPass final : public Visitor {
112 typedef Visitor Parent;
113 virtual void visit( EnumDecl *aggregateDecl );
114 virtual void visit( FunctionType *func );
115 };
116
117 /// Associates forward declarations of aggregates with their definitions
118 class LinkReferenceToTypes final : public Indexer {
119 typedef Indexer Parent;
120 public:
121 LinkReferenceToTypes( bool doDebug, const Indexer *indexer );
122 private:
123 using Parent::visit;
124 void visit( EnumInstType *enumInst ) final;
125 void visit( StructInstType *structInst ) final;
126 void visit( UnionInstType *unionInst ) final;
127 void visit( TraitInstType *contextInst ) final;
128 void visit( EnumDecl *enumDecl ) final;
129 void visit( StructDecl *structDecl ) final;
130 void visit( UnionDecl *unionDecl ) final;
131 void visit( TypeInstType *typeInst ) final;
132
133 const Indexer *indexer;
134
135 typedef std::map< std::string, std::list< EnumInstType * > > ForwardEnumsType;
136 typedef std::map< std::string, std::list< StructInstType * > > ForwardStructsType;
137 typedef std::map< std::string, std::list< UnionInstType * > > ForwardUnionsType;
138 ForwardEnumsType forwardEnums;
139 ForwardStructsType forwardStructs;
140 ForwardUnionsType forwardUnions;
141 };
142
143 /// Replaces array and function types in forall lists by appropriate pointer type
144 class Pass3 final : public Indexer {
145 typedef Indexer Parent;
146 public:
147 using Parent::visit;
148 Pass3( const Indexer *indexer );
149 private:
150 virtual void visit( ObjectDecl *object ) override;
151 virtual void visit( FunctionDecl *func ) override;
152
153 const Indexer *indexer;
154 };
155
156 class ReturnChecker : public Visitor {
157 public:
158 /// Checks that return statements return nothing if their return type is void
159 /// and return something if the return type is non-void.
160 static void checkFunctionReturns( std::list< Declaration * > & translationUnit );
161 private:
162 virtual void visit( FunctionDecl * functionDecl );
163
164 virtual void visit( ReturnStmt * returnStmt );
165
166 std::list< DeclarationWithType * > returnVals;
167 };
168
169 class EliminateTypedef : public Mutator {
170 public:
171 EliminateTypedef() : scopeLevel( 0 ) {}
172 /// Replaces typedefs by forward declarations
173 static void eliminateTypedef( std::list< Declaration * > &translationUnit );
174 private:
175 virtual Declaration *mutate( TypedefDecl *typeDecl );
176 virtual TypeDecl *mutate( TypeDecl *typeDecl );
177 virtual DeclarationWithType *mutate( FunctionDecl *funcDecl );
178 virtual DeclarationWithType *mutate( ObjectDecl *objDecl );
179 virtual CompoundStmt *mutate( CompoundStmt *compoundStmt );
180 virtual Type *mutate( TypeInstType *aggregateUseType );
181 virtual Expression *mutate( CastExpr *castExpr );
182
183 virtual Declaration *mutate( StructDecl * structDecl );
184 virtual Declaration *mutate( UnionDecl * unionDecl );
185 virtual Declaration *mutate( EnumDecl * enumDecl );
186 virtual Declaration *mutate( TraitDecl * contextDecl );
187
188 template<typename AggDecl>
189 AggDecl *handleAggregate( AggDecl * aggDecl );
190
191 template<typename AggDecl>
192 void addImplicitTypedef( AggDecl * aggDecl );
193
194 typedef std::unique_ptr<TypedefDecl> TypedefDeclPtr;
195 typedef ScopedMap< std::string, std::pair< TypedefDeclPtr, int > > TypedefMap;
196 typedef std::map< std::string, TypeDecl * > TypeDeclMap;
197 TypedefMap typedefNames;
198 TypeDeclMap typedeclNames;
199 int scopeLevel;
200 };
201
202 class VerifyCtorDtorAssign : public Visitor {
203 public:
204 /// ensure that constructors, destructors, and assignment have at least one
205 /// parameter, the first of which must be a pointer, and that ctor/dtors have no
206 /// return values.
207 static void verify( std::list< Declaration * > &translationUnit );
208
209 virtual void visit( FunctionDecl *funcDecl );
210 };
211
212 class CompoundLiteral final : public GenPoly::DeclMutator {
213 DeclarationNode::StorageClass storageclass = DeclarationNode::NoStorageClass;
214
215 using GenPoly::DeclMutator::mutate;
216 DeclarationWithType * mutate( ObjectDecl *objectDecl ) final;
217 Expression *mutate( CompoundLiteralExpr *compLitExpr ) final;
218 };
219
220 void validate( std::list< Declaration * > &translationUnit, bool doDebug ) {
221 EnumAndPointerDecayPass epc;
222 LinkReferenceToTypes lrt( doDebug, 0 );
223 Pass3 pass3( 0 );
224 CompoundLiteral compoundliteral;
225
226 EliminateTypedef::eliminateTypedef( translationUnit );
227 HoistStruct::hoistStruct( translationUnit );
228 ReturnTypeFixer::fix( translationUnit ); // must happen before autogen
229 autogenerateRoutines( translationUnit ); // moved up, used to be below compoundLiteral - currently needs EnumAndPointerDecayPass
230 acceptAll( translationUnit, epc );
231 acceptAll( translationUnit, lrt );
232 ReturnChecker::checkFunctionReturns( translationUnit );
233 compoundliteral.mutateDeclarationList( translationUnit );
234 acceptAll( translationUnit, pass3 );
235 VerifyCtorDtorAssign::verify( translationUnit );
236 }
237
238 void validateType( Type *type, const Indexer *indexer ) {
239 EnumAndPointerDecayPass epc;
240 LinkReferenceToTypes lrt( false, indexer );
241 Pass3 pass3( indexer );
242 type->accept( epc );
243 type->accept( lrt );
244 type->accept( pass3 );
245 }
246
247 void HoistStruct::hoistStruct( std::list< Declaration * > &translationUnit ) {
248 HoistStruct hoister;
249 acceptAndAdd( translationUnit, hoister );
250 }
251
252 HoistStruct::HoistStruct() : inStruct( false ) {
253 }
254
255 void filter( std::list< Declaration * > &declList, bool (*pred)( Declaration * ), bool doDelete ) {
256 std::list< Declaration * >::iterator i = declList.begin();
257 while ( i != declList.end() ) {
258 std::list< Declaration * >::iterator next = i;
259 ++next;
260 if ( pred( *i ) ) {
261 if ( doDelete ) {
262 delete *i;
263 } // if
264 declList.erase( i );
265 } // if
266 i = next;
267 } // while
268 }
269
270 bool isStructOrUnion( Declaration *decl ) {
271 return dynamic_cast< StructDecl * >( decl ) || dynamic_cast< UnionDecl * >( decl );
272 }
273
274 template< typename AggDecl >
275 void HoistStruct::handleAggregate( AggDecl *aggregateDecl ) {
276 if ( inStruct ) {
277 // Add elements in stack order corresponding to nesting structure.
278 declsToAdd.push_front( aggregateDecl );
279 Visitor::visit( aggregateDecl );
280 } else {
281 inStruct = true;
282 Visitor::visit( aggregateDecl );
283 inStruct = false;
284 } // if
285 // Always remove the hoisted aggregate from the inner structure.
286 filter( aggregateDecl->get_members(), isStructOrUnion, false );
287 }
288
289 void HoistStruct::visit( EnumInstType *structInstType ) {
290 if ( structInstType->get_baseEnum() ) {
291 declsToAdd.push_front( structInstType->get_baseEnum() );
292 }
293 }
294
295 void HoistStruct::visit( StructInstType *structInstType ) {
296 if ( structInstType->get_baseStruct() ) {
297 declsToAdd.push_front( structInstType->get_baseStruct() );
298 }
299 }
300
301 void HoistStruct::visit( UnionInstType *structInstType ) {
302 if ( structInstType->get_baseUnion() ) {
303 declsToAdd.push_front( structInstType->get_baseUnion() );
304 }
305 }
306
307 void HoistStruct::visit( StructDecl *aggregateDecl ) {
308 handleAggregate( aggregateDecl );
309 }
310
311 void HoistStruct::visit( UnionDecl *aggregateDecl ) {
312 handleAggregate( aggregateDecl );
313 }
314
315 void HoistStruct::visit( CompoundStmt *compoundStmt ) {
316 addVisit( compoundStmt, *this );
317 }
318
319 void HoistStruct::visit( SwitchStmt *switchStmt ) {
320 addVisit( switchStmt, *this );
321 }
322
323 void EnumAndPointerDecayPass::visit( EnumDecl *enumDecl ) {
324 // Set the type of each member of the enumeration to be EnumConstant
325 for ( std::list< Declaration * >::iterator i = enumDecl->get_members().begin(); i != enumDecl->get_members().end(); ++i ) {
326 ObjectDecl * obj = dynamic_cast< ObjectDecl * >( *i );
327 assert( obj );
328 obj->set_type( new EnumInstType( Type::Qualifiers( true, false, false, false, false ), enumDecl->get_name() ) );
329 } // for
330 Parent::visit( enumDecl );
331 }
332
333 namespace {
334 template< typename DWTList >
335 void fixFunctionList( DWTList & dwts, FunctionType * func ) {
336 // the only case in which "void" is valid is where it is the only one in the list; then it should be removed
337 // entirely other fix ups are handled by the FixFunction class
338 typedef typename DWTList::iterator DWTIterator;
339 DWTIterator begin( dwts.begin() ), end( dwts.end() );
340 if ( begin == end ) return;
341 FixFunction fixer;
342 DWTIterator i = begin;
343 *i = (*i)->acceptMutator( fixer );
344 if ( fixer.get_isVoid() ) {
345 DWTIterator j = i;
346 ++i;
347 delete *j;
348 dwts.erase( j );
349 if ( i != end ) {
350 throw SemanticError( "invalid type void in function type ", func );
351 } // if
352 } else {
353 ++i;
354 for ( ; i != end; ++i ) {
355 FixFunction fixer;
356 *i = (*i )->acceptMutator( fixer );
357 if ( fixer.get_isVoid() ) {
358 throw SemanticError( "invalid type void in function type ", func );
359 } // if
360 } // for
361 } // if
362 }
363 }
364
365 void EnumAndPointerDecayPass::visit( FunctionType *func ) {
366 // Fix up parameters and return types
367 fixFunctionList( func->get_parameters(), func );
368 fixFunctionList( func->get_returnVals(), func );
369 Visitor::visit( func );
370 }
371
372 LinkReferenceToTypes::LinkReferenceToTypes( bool doDebug, const Indexer *other_indexer ) : Indexer( doDebug ) {
373 if ( other_indexer ) {
374 indexer = other_indexer;
375 } else {
376 indexer = this;
377 } // if
378 }
379
380 void LinkReferenceToTypes::visit( EnumInstType *enumInst ) {
381 Parent::visit( enumInst );
382 EnumDecl *st = indexer->lookupEnum( enumInst->get_name() );
383 // it's not a semantic error if the enum is not found, just an implicit forward declaration
384 if ( st ) {
385 //assert( ! enumInst->get_baseEnum() || enumInst->get_baseEnum()->get_members().empty() || ! st->get_members().empty() );
386 enumInst->set_baseEnum( st );
387 } // if
388 if ( ! st || st->get_members().empty() ) {
389 // use of forward declaration
390 forwardEnums[ enumInst->get_name() ].push_back( enumInst );
391 } // if
392 }
393
394 void LinkReferenceToTypes::visit( StructInstType *structInst ) {
395 Parent::visit( structInst );
396 StructDecl *st = indexer->lookupStruct( structInst->get_name() );
397 // it's not a semantic error if the struct is not found, just an implicit forward declaration
398 if ( st ) {
399 //assert( ! structInst->get_baseStruct() || structInst->get_baseStruct()->get_members().empty() || ! st->get_members().empty() );
400 structInst->set_baseStruct( st );
401 } // if
402 if ( ! st || st->get_members().empty() ) {
403 // use of forward declaration
404 forwardStructs[ structInst->get_name() ].push_back( structInst );
405 } // if
406 }
407
408 void LinkReferenceToTypes::visit( UnionInstType *unionInst ) {
409 Parent::visit( unionInst );
410 UnionDecl *un = indexer->lookupUnion( unionInst->get_name() );
411 // it's not a semantic error if the union is not found, just an implicit forward declaration
412 if ( un ) {
413 unionInst->set_baseUnion( un );
414 } // if
415 if ( ! un || un->get_members().empty() ) {
416 // use of forward declaration
417 forwardUnions[ unionInst->get_name() ].push_back( unionInst );
418 } // if
419 }
420
421 void LinkReferenceToTypes::visit( TraitInstType *traitInst ) {
422 Parent::visit( traitInst );
423 if ( traitInst->get_name() == "sized" ) {
424 // "sized" is a special trait with no members - just flick the sized status on for the type variable
425 if ( traitInst->get_parameters().size() != 1 ) {
426 throw SemanticError( "incorrect number of trait parameters: ", traitInst );
427 }
428 TypeExpr * param = safe_dynamic_cast< TypeExpr * > ( traitInst->get_parameters().front() );
429 TypeInstType * inst = safe_dynamic_cast< TypeInstType * > ( param->get_type() );
430 TypeDecl * decl = inst->get_baseType();
431 decl->set_sized( true );
432 // since "sized" is special, the next few steps don't apply
433 return;
434 }
435 TraitDecl *traitDecl = indexer->lookupTrait( traitInst->get_name() );
436 if ( ! traitDecl ) {
437 throw SemanticError( "use of undeclared trait " + traitInst->get_name() );
438 } // if
439 if ( traitDecl->get_parameters().size() != traitInst->get_parameters().size() ) {
440 throw SemanticError( "incorrect number of trait parameters: ", traitInst );
441 } // if
442
443 for ( TypeDecl * td : traitDecl->get_parameters() ) {
444 for ( DeclarationWithType * assert : td->get_assertions() ) {
445 traitInst->get_members().push_back( assert->clone() );
446 } // for
447 } // for
448
449 // need to clone members of the trait for ownership purposes
450 std::list< Declaration * > members;
451 std::transform( traitDecl->get_members().begin(), traitDecl->get_members().end(), back_inserter( members ), [](Declaration * dwt) { return dwt->clone(); } );
452
453 applySubstitution( traitDecl->get_parameters().begin(), traitDecl->get_parameters().end(), traitInst->get_parameters().begin(), members.begin(), members.end(), back_inserter( traitInst->get_members() ) );
454
455 // need to carry over the 'sized' status of each decl in the instance
456 for ( auto p : group_iterate( traitDecl->get_parameters(), traitInst->get_parameters() ) ) {
457 TypeExpr * expr = safe_dynamic_cast< TypeExpr * >( std::get<1>(p) );
458 if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( expr->get_type() ) ) {
459 TypeDecl * formalDecl = std::get<0>(p);
460 TypeDecl * instDecl = inst->get_baseType();
461 if ( formalDecl->get_sized() ) instDecl->set_sized( true );
462 }
463 }
464 }
465
466 void LinkReferenceToTypes::visit( EnumDecl *enumDecl ) {
467 // visit enum members first so that the types of self-referencing members are updated properly
468 Parent::visit( enumDecl );
469 if ( ! enumDecl->get_members().empty() ) {
470 ForwardEnumsType::iterator fwds = forwardEnums.find( enumDecl->get_name() );
471 if ( fwds != forwardEnums.end() ) {
472 for ( std::list< EnumInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
473 (*inst )->set_baseEnum( enumDecl );
474 } // for
475 forwardEnums.erase( fwds );
476 } // if
477 } // if
478 }
479
480 void LinkReferenceToTypes::visit( StructDecl *structDecl ) {
481 // visit struct members first so that the types of self-referencing members are updated properly
482 Parent::visit( structDecl );
483 if ( ! structDecl->get_members().empty() ) {
484 ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->get_name() );
485 if ( fwds != forwardStructs.end() ) {
486 for ( std::list< StructInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
487 (*inst )->set_baseStruct( structDecl );
488 } // for
489 forwardStructs.erase( fwds );
490 } // if
491 } // if
492 }
493
494 void LinkReferenceToTypes::visit( UnionDecl *unionDecl ) {
495 Parent::visit( unionDecl );
496 if ( ! unionDecl->get_members().empty() ) {
497 ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->get_name() );
498 if ( fwds != forwardUnions.end() ) {
499 for ( std::list< UnionInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
500 (*inst )->set_baseUnion( unionDecl );
501 } // for
502 forwardUnions.erase( fwds );
503 } // if
504 } // if
505 }
506
507 void LinkReferenceToTypes::visit( TypeInstType *typeInst ) {
508 if ( NamedTypeDecl *namedTypeDecl = lookupType( typeInst->get_name() ) ) {
509 if ( TypeDecl *typeDecl = dynamic_cast< TypeDecl * >( namedTypeDecl ) ) {
510 typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype );
511 } // if
512 } // if
513 }
514
515 Pass3::Pass3( const Indexer *other_indexer ) : Indexer( false ) {
516 if ( other_indexer ) {
517 indexer = other_indexer;
518 } else {
519 indexer = this;
520 } // if
521 }
522
523 /// Fix up assertions - flattens assertion lists, removing all trait instances
524 void forallFixer( Type * func ) {
525 for ( TypeDecl * type : func->get_forall() ) {
526 std::list< DeclarationWithType * > toBeDone, nextRound;
527 toBeDone.splice( toBeDone.end(), type->get_assertions() );
528 while ( ! toBeDone.empty() ) {
529 for ( DeclarationWithType * assertion : toBeDone ) {
530 if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) {
531 // expand trait instance into all of its members
532 for ( Declaration * member : traitInst->get_members() ) {
533 DeclarationWithType *dwt = safe_dynamic_cast< DeclarationWithType * >( member );
534 nextRound.push_back( dwt->clone() );
535 }
536 delete traitInst;
537 } else {
538 // pass assertion through
539 FixFunction fixer;
540 assertion = assertion->acceptMutator( fixer );
541 if ( fixer.get_isVoid() ) {
542 throw SemanticError( "invalid type void in assertion of function ", func );
543 }
544 type->get_assertions().push_back( assertion );
545 } // if
546 } // for
547 toBeDone.clear();
548 toBeDone.splice( toBeDone.end(), nextRound );
549 } // while
550 } // for
551 }
552
553 void Pass3::visit( ObjectDecl *object ) {
554 forallFixer( object->get_type() );
555 if ( PointerType *pointer = dynamic_cast< PointerType * >( object->get_type() ) ) {
556 forallFixer( pointer->get_base() );
557 } // if
558 Parent::visit( object );
559 object->fixUniqueId();
560 }
561
562 void Pass3::visit( FunctionDecl *func ) {
563 forallFixer( func->get_type() );
564 Parent::visit( func );
565 func->fixUniqueId();
566 }
567
568 void ReturnChecker::checkFunctionReturns( std::list< Declaration * > & translationUnit ) {
569 ReturnChecker checker;
570 acceptAll( translationUnit, checker );
571 }
572
573 void ReturnChecker::visit( FunctionDecl * functionDecl ) {
574 std::list< DeclarationWithType * > oldReturnVals = returnVals;
575 returnVals = functionDecl->get_functionType()->get_returnVals();
576 Visitor::visit( functionDecl );
577 returnVals = oldReturnVals;
578 }
579
580 void ReturnChecker::visit( ReturnStmt * returnStmt ) {
581 // Previously this also checked for the existence of an expr paired with no return values on
582 // the function return type. This is incorrect, since you can have an expression attached to
583 // a return statement in a void-returning function in C. The expression is treated as if it
584 // were cast to void.
585 if ( returnStmt->get_expr() == NULL && returnVals.size() != 0 ) {
586 throw SemanticError( "Non-void function returns no values: " , returnStmt );
587 }
588 }
589
590
591 bool isTypedef( Declaration *decl ) {
592 return dynamic_cast< TypedefDecl * >( decl );
593 }
594
595 void EliminateTypedef::eliminateTypedef( std::list< Declaration * > &translationUnit ) {
596 EliminateTypedef eliminator;
597 mutateAll( translationUnit, eliminator );
598 if ( eliminator.typedefNames.count( "size_t" ) ) {
599 // grab and remember declaration of size_t
600 SizeType = eliminator.typedefNames["size_t"].first->get_base()->clone();
601 } else {
602 // xxx - missing global typedef for size_t - default to long unsigned int, even though that may be wrong
603 // eventually should have a warning for this case.
604 SizeType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
605 }
606 filter( translationUnit, isTypedef, true );
607
608 }
609
610 Type *EliminateTypedef::mutate( TypeInstType * typeInst ) {
611 // instances of typedef types will come here. If it is an instance
612 // of a typdef type, link the instance to its actual type.
613 TypedefMap::const_iterator def = typedefNames.find( typeInst->get_name() );
614 if ( def != typedefNames.end() ) {
615 Type *ret = def->second.first->get_base()->clone();
616 ret->get_qualifiers() += typeInst->get_qualifiers();
617 // place instance parameters on the typedef'd type
618 if ( ! typeInst->get_parameters().empty() ) {
619 ReferenceToType *rtt = dynamic_cast<ReferenceToType*>(ret);
620 if ( ! rtt ) {
621 throw SemanticError("cannot apply type parameters to base type of " + typeInst->get_name());
622 }
623 rtt->get_parameters().clear();
624 cloneAll( typeInst->get_parameters(), rtt->get_parameters() );
625 mutateAll( rtt->get_parameters(), *this ); // recursively fix typedefs on parameters
626 } // if
627 delete typeInst;
628 return ret;
629 } else {
630 TypeDeclMap::const_iterator base = typedeclNames.find( typeInst->get_name() );
631 assertf( base != typedeclNames.end(), "Can't find typedecl name %s", typeInst->get_name().c_str() );
632 typeInst->set_baseType( base->second );
633 } // if
634 return typeInst;
635 }
636
637 Declaration *EliminateTypedef::mutate( TypedefDecl * tyDecl ) {
638 Declaration *ret = Mutator::mutate( tyDecl );
639
640 if ( typedefNames.count( tyDecl->get_name() ) == 1 && typedefNames[ tyDecl->get_name() ].second == scopeLevel ) {
641 // typedef to the same name from the same scope
642 // must be from the same type
643
644 Type * t1 = tyDecl->get_base();
645 Type * t2 = typedefNames[ tyDecl->get_name() ].first->get_base();
646 if ( ! ResolvExpr::typesCompatible( t1, t2, Indexer() ) ) {
647 throw SemanticError( "cannot redefine typedef: " + tyDecl->get_name() );
648 }
649 } else {
650 typedefNames[ tyDecl->get_name() ] = std::make_pair( TypedefDeclPtr( tyDecl ), scopeLevel );
651 } // if
652
653 // When a typedef is a forward declaration:
654 // typedef struct screen SCREEN;
655 // the declaration portion must be retained:
656 // struct screen;
657 // because the expansion of the typedef is:
658 // void rtn( SCREEN *p ) => void rtn( struct screen *p )
659 // hence the type-name "screen" must be defined.
660 // Note, qualifiers on the typedef are superfluous for the forward declaration.
661 if ( StructInstType *aggDecl = dynamic_cast< StructInstType * >( tyDecl->get_base() ) ) {
662 return aggDecl->get_baseStruct() ? Mutator::mutate( aggDecl->get_baseStruct() ) : new StructDecl( aggDecl->get_name() );
663 } else if ( UnionInstType *aggDecl = dynamic_cast< UnionInstType * >( tyDecl->get_base() ) ) {
664 return aggDecl->get_baseUnion() ? Mutator::mutate( aggDecl->get_baseUnion() ) : new UnionDecl( aggDecl->get_name() );
665 } else if ( EnumInstType *enumDecl = dynamic_cast< EnumInstType * >( tyDecl->get_base() ) ) {
666 return new EnumDecl( enumDecl->get_name() );
667 } else {
668 return ret->clone();
669 } // if
670 }
671
672 TypeDecl *EliminateTypedef::mutate( TypeDecl * typeDecl ) {
673 TypedefMap::iterator i = typedefNames.find( typeDecl->get_name() );
674 if ( i != typedefNames.end() ) {
675 typedefNames.erase( i ) ;
676 } // if
677
678 typedeclNames[ typeDecl->get_name() ] = typeDecl;
679 return Mutator::mutate( typeDecl );
680 }
681
682 DeclarationWithType *EliminateTypedef::mutate( FunctionDecl * funcDecl ) {
683 typedefNames.beginScope();
684 DeclarationWithType *ret = Mutator::mutate( funcDecl );
685 typedefNames.endScope();
686 return ret;
687 }
688
689 DeclarationWithType *EliminateTypedef::mutate( ObjectDecl * objDecl ) {
690 typedefNames.beginScope();
691 DeclarationWithType *ret = Mutator::mutate( objDecl );
692 typedefNames.endScope();
693 // is the type a function?
694 if ( FunctionType *funtype = dynamic_cast<FunctionType *>( ret->get_type() ) ) {
695 // replace the current object declaration with a function declaration
696 FunctionDecl * newDecl = new FunctionDecl( ret->get_name(), ret->get_storageClass(), ret->get_linkage(), funtype, 0, ret->get_isInline(), ret->get_isNoreturn(), objDecl->get_attributes() );
697 objDecl->get_attributes().clear();
698 objDecl->set_type( nullptr );
699 delete objDecl;
700 return newDecl;
701 } else if ( objDecl->get_isInline() || objDecl->get_isNoreturn() ) {
702 throw SemanticError( "invalid inline or _Noreturn specification in declaration of ", objDecl );
703 } // if
704 return ret;
705 }
706
707 Expression *EliminateTypedef::mutate( CastExpr * castExpr ) {
708 typedefNames.beginScope();
709 Expression *ret = Mutator::mutate( castExpr );
710 typedefNames.endScope();
711 return ret;
712 }
713
714 CompoundStmt *EliminateTypedef::mutate( CompoundStmt * compoundStmt ) {
715 typedefNames.beginScope();
716 scopeLevel += 1;
717 CompoundStmt *ret = Mutator::mutate( compoundStmt );
718 scopeLevel -= 1;
719 std::list< Statement * >::iterator i = compoundStmt->get_kids().begin();
720 while ( i != compoundStmt->get_kids().end() ) {
721 std::list< Statement * >::iterator next = i+1;
722 if ( DeclStmt *declStmt = dynamic_cast< DeclStmt * >( *i ) ) {
723 if ( dynamic_cast< TypedefDecl * >( declStmt->get_decl() ) ) {
724 delete *i;
725 compoundStmt->get_kids().erase( i );
726 } // if
727 } // if
728 i = next;
729 } // while
730 typedefNames.endScope();
731 return ret;
732 }
733
734 // there may be typedefs nested within aggregates. in order for everything to work properly, these should be removed
735 // as well
736 template<typename AggDecl>
737 AggDecl *EliminateTypedef::handleAggregate( AggDecl * aggDecl ) {
738 std::list<Declaration *>::iterator it = aggDecl->get_members().begin();
739 for ( ; it != aggDecl->get_members().end(); ) {
740 std::list< Declaration * >::iterator next = it+1;
741 if ( dynamic_cast< TypedefDecl * >( *it ) ) {
742 delete *it;
743 aggDecl->get_members().erase( it );
744 } // if
745 it = next;
746 }
747 return aggDecl;
748 }
749
750 template<typename AggDecl>
751 void EliminateTypedef::addImplicitTypedef( AggDecl * aggDecl ) {
752 if ( typedefNames.count( aggDecl->get_name() ) == 0 ) {
753 Type *type = nullptr;
754 if ( StructDecl * newDeclStructDecl = dynamic_cast< StructDecl * >( aggDecl ) ) {
755 type = new StructInstType( Type::Qualifiers(), newDeclStructDecl->get_name() );
756 } else if ( UnionDecl * newDeclUnionDecl = dynamic_cast< UnionDecl * >( aggDecl ) ) {
757 type = new UnionInstType( Type::Qualifiers(), newDeclUnionDecl->get_name() );
758 } else if ( EnumDecl * newDeclEnumDecl = dynamic_cast< EnumDecl * >( aggDecl ) ) {
759 type = new EnumInstType( Type::Qualifiers(), newDeclEnumDecl->get_name() );
760 } // if
761 TypedefDeclPtr tyDecl( new TypedefDecl( aggDecl->get_name(), DeclarationNode::NoStorageClass, type ) );
762 typedefNames[ aggDecl->get_name() ] = std::make_pair( std::move( tyDecl ), scopeLevel );
763 } // if
764 }
765
766 Declaration *EliminateTypedef::mutate( StructDecl * structDecl ) {
767 addImplicitTypedef( structDecl );
768 Mutator::mutate( structDecl );
769 return handleAggregate( structDecl );
770 }
771
772 Declaration *EliminateTypedef::mutate( UnionDecl * unionDecl ) {
773 addImplicitTypedef( unionDecl );
774 Mutator::mutate( unionDecl );
775 return handleAggregate( unionDecl );
776 }
777
778 Declaration *EliminateTypedef::mutate( EnumDecl * enumDecl ) {
779 addImplicitTypedef( enumDecl );
780 Mutator::mutate( enumDecl );
781 return handleAggregate( enumDecl );
782 }
783
784 Declaration *EliminateTypedef::mutate( TraitDecl * contextDecl ) {
785 Mutator::mutate( contextDecl );
786 return handleAggregate( contextDecl );
787 }
788
789 void VerifyCtorDtorAssign::verify( std::list< Declaration * > & translationUnit ) {
790 VerifyCtorDtorAssign verifier;
791 acceptAll( translationUnit, verifier );
792 }
793
794 void VerifyCtorDtorAssign::visit( FunctionDecl * funcDecl ) {
795 FunctionType * funcType = funcDecl->get_functionType();
796 std::list< DeclarationWithType * > &returnVals = funcType->get_returnVals();
797 std::list< DeclarationWithType * > &params = funcType->get_parameters();
798
799 if ( InitTweak::isCtorDtorAssign( funcDecl->get_name() ) ) {
800 if ( params.size() == 0 ) {
801 throw SemanticError( "Constructors, destructors, and assignment functions require at least one parameter ", funcDecl );
802 }
803 if ( ! dynamic_cast< PointerType * >( params.front()->get_type() ) ) {
804 throw SemanticError( "First parameter of a constructor, destructor, or assignment function must be a pointer ", funcDecl );
805 }
806 if ( InitTweak::isCtorDtor( funcDecl->get_name() ) && returnVals.size() != 0 ) {
807 throw SemanticError( "Constructors and destructors cannot have explicit return values ", funcDecl );
808 }
809 }
810
811 Visitor::visit( funcDecl );
812 }
813
814 DeclarationWithType * CompoundLiteral::mutate( ObjectDecl *objectDecl ) {
815 storageclass = objectDecl->get_storageClass();
816 DeclarationWithType * temp = Mutator::mutate( objectDecl );
817 storageclass = DeclarationNode::NoStorageClass;
818 return temp;
819 }
820
821 Expression *CompoundLiteral::mutate( CompoundLiteralExpr *compLitExpr ) {
822 // transform [storage_class] ... (struct S){ 3, ... };
823 // into [storage_class] struct S temp = { 3, ... };
824 static UniqueName indexName( "_compLit" );
825
826 ObjectDecl *tempvar = new ObjectDecl( indexName.newName(), storageclass, LinkageSpec::C, 0, compLitExpr->get_type(), compLitExpr->get_initializer() );
827 compLitExpr->set_type( 0 );
828 compLitExpr->set_initializer( 0 );
829 delete compLitExpr;
830 DeclarationWithType * newtempvar = mutate( tempvar );
831 addDeclaration( newtempvar ); // add modified temporary to current block
832 return new VariableExpr( newtempvar );
833 }
834
835 void ReturnTypeFixer::fix( std::list< Declaration * > &translationUnit ) {
836 ReturnTypeFixer fixer;
837 acceptAll( translationUnit, fixer );
838 }
839
840 void ReturnTypeFixer::visit( FunctionDecl * functionDecl ) {
841 Parent::visit( functionDecl );
842 FunctionType * ftype = functionDecl->get_functionType();
843 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
844 assertf( retVals.size() == 0 || retVals.size() == 1, "Function %s has too many return values: %d", functionDecl->get_name().c_str(), retVals.size() );
845 if ( retVals.size() == 1 ) {
846 // 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)
847 // ensure other return values have a name
848 DeclarationWithType * ret = retVals.front();
849 if ( ret->get_name() == "" ) {
850 ret->set_name( toString( "_retval_", CodeGen::genName( functionDecl ) ) );
851 }
852 }
853 }
854
855 void ReturnTypeFixer::visit( FunctionType * ftype ) {
856 // xxx - need to handle named return values - this information needs to be saved somehow
857 // so that resolution has access to the names.
858 // Note that this pass needs to happen early so that other passes which look for tuple types
859 // find them in all of the right places, including function return types.
860 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
861 if ( retVals.size() > 1 ) {
862 // generate a single return parameter which is the tuple of all of the return values
863 TupleType * tupleType = safe_dynamic_cast< TupleType * >( ResolvExpr::extractResultType( ftype ) );
864 // ensure return value is not destructed by explicitly creating an empty ListInit node wherein maybeConstruct is false.
865 ObjectDecl * newRet = new ObjectDecl( "", DeclarationNode::NoStorageClass, LinkageSpec::Cforall, 0, tupleType, new ListInit( std::list<Initializer*>(), noDesignators, false ) );
866 deleteAll( retVals );
867 retVals.clear();
868 retVals.push_back( newRet );
869 }
870 }
871} // namespace SymTab
872
873// Local Variables: //
874// tab-width: 4 //
875// mode: c++ //
876// compile-command: "make install" //
877// End: //
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