source: src/SymTab/Validate.cc@ ab16fc5

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 ab16fc5 was fbd7ad6, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

compute and store array length when missing and known at compile-time
  • Property mode set to 100644
File size: 33.8 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 <list>
41#include <iterator>
42#include "Common/ScopedMap.h"
43#include "Common/utility.h"
44#include "Common/UniqueName.h"
45#include "Concurrency/Keywords.h"
46#include "Validate.h"
47#include "SynTree/Visitor.h"
48#include "SynTree/Mutator.h"
49#include "SynTree/Type.h"
50#include "SynTree/Expression.h"
51#include "SynTree/Statement.h"
52#include "SynTree/TypeSubstitution.h"
53#include "Indexer.h"
54#include "FixFunction.h"
55// #include "ImplementationType.h"
56#include "GenPoly/DeclMutator.h"
57#include "AddVisit.h"
58#include "MakeLibCfa.h"
59#include "TypeEquality.h"
60#include "Autogen.h"
61#include "ResolvExpr/typeops.h"
62#include <algorithm>
63#include "InitTweak/InitTweak.h"
64#include "CodeGen/CodeGenerator.h"
65
66#define debugPrint( x ) if ( doDebug ) { std::cout << x; }
67
68namespace SymTab {
69 class HoistStruct final : public Visitor {
70 template< typename Visitor >
71 friend void acceptAndAdd( std::list< Declaration * > &translationUnit, Visitor &visitor );
72 template< typename Visitor >
73 friend void addVisitStatementList( std::list< Statement* > &stmts, Visitor &visitor );
74 public:
75 /// Flattens nested struct types
76 static void hoistStruct( std::list< Declaration * > &translationUnit );
77
78 std::list< Declaration * > &get_declsToAdd() { return declsToAdd; }
79
80 virtual void visit( EnumInstType *enumInstType );
81 virtual void visit( StructInstType *structInstType );
82 virtual void visit( UnionInstType *unionInstType );
83 virtual void visit( StructDecl *aggregateDecl );
84 virtual void visit( UnionDecl *aggregateDecl );
85
86 virtual void visit( CompoundStmt *compoundStmt );
87 virtual void visit( SwitchStmt *switchStmt );
88 private:
89 HoistStruct();
90
91 template< typename AggDecl > void handleAggregate( AggDecl *aggregateDecl );
92
93 std::list< Declaration * > declsToAdd, declsToAddAfter;
94 bool inStruct;
95 };
96
97 /// Fix return types so that every function returns exactly one value
98 class ReturnTypeFixer final : public Visitor {
99 public:
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 virtual void visit( FunctionType * ftype );
107 };
108
109 /// Replaces enum types by int, and function or array types in function parameter and return lists by appropriate pointers.
110 class EnumAndPointerDecayPass final : public Visitor {
111 typedef Visitor Parent;
112 virtual void visit( EnumDecl *aggregateDecl );
113 virtual void visit( FunctionType *func );
114 };
115
116 /// Associates forward declarations of aggregates with their definitions
117 class LinkReferenceToTypes final : public Indexer {
118 typedef Indexer Parent;
119 public:
120 LinkReferenceToTypes( bool doDebug, const Indexer *indexer );
121 private:
122 using Parent::visit;
123 void visit( EnumInstType *enumInst ) final;
124 void visit( StructInstType *structInst ) final;
125 void visit( UnionInstType *unionInst ) final;
126 void visit( TraitInstType *contextInst ) final;
127 void visit( EnumDecl *enumDecl ) final;
128 void visit( StructDecl *structDecl ) final;
129 void visit( UnionDecl *unionDecl ) final;
130 void visit( TypeInstType *typeInst ) final;
131
132 const Indexer *indexer;
133
134 typedef std::map< std::string, std::list< EnumInstType * > > ForwardEnumsType;
135 typedef std::map< std::string, std::list< StructInstType * > > ForwardStructsType;
136 typedef std::map< std::string, std::list< UnionInstType * > > ForwardUnionsType;
137 ForwardEnumsType forwardEnums;
138 ForwardStructsType forwardStructs;
139 ForwardUnionsType forwardUnions;
140 };
141
142 /// Replaces array and function types in forall lists by appropriate pointer type
143 class Pass3 final : public Indexer {
144 typedef Indexer Parent;
145 public:
146 using Parent::visit;
147 Pass3( const Indexer *indexer );
148 private:
149 virtual void visit( ObjectDecl *object ) override;
150 virtual void visit( FunctionDecl *func ) override;
151
152 const Indexer *indexer;
153 };
154
155 class ReturnChecker : public Visitor {
156 public:
157 /// Checks that return statements return nothing if their return type is void
158 /// and return something if the return type is non-void.
159 static void checkFunctionReturns( std::list< Declaration * > & translationUnit );
160 private:
161 virtual void visit( FunctionDecl * functionDecl );
162 virtual void visit( ReturnStmt * returnStmt );
163
164 std::list< DeclarationWithType * > returnVals;
165 };
166
167 class EliminateTypedef : public Mutator {
168 public:
169 EliminateTypedef() : scopeLevel( 0 ) {}
170 /// Replaces typedefs by forward declarations
171 static void eliminateTypedef( std::list< Declaration * > &translationUnit );
172 private:
173 virtual Declaration *mutate( TypedefDecl *typeDecl );
174 virtual TypeDecl *mutate( TypeDecl *typeDecl );
175 virtual DeclarationWithType *mutate( FunctionDecl *funcDecl );
176 virtual DeclarationWithType *mutate( ObjectDecl *objDecl );
177 virtual CompoundStmt *mutate( CompoundStmt *compoundStmt );
178 virtual Type *mutate( TypeInstType *aggregateUseType );
179 virtual Expression *mutate( CastExpr *castExpr );
180
181 virtual Declaration *mutate( StructDecl * structDecl );
182 virtual Declaration *mutate( UnionDecl * unionDecl );
183 virtual Declaration *mutate( EnumDecl * enumDecl );
184 virtual Declaration *mutate( TraitDecl * contextDecl );
185
186 template<typename AggDecl>
187 AggDecl *handleAggregate( AggDecl * aggDecl );
188
189 template<typename AggDecl>
190 void addImplicitTypedef( AggDecl * aggDecl );
191
192 typedef std::unique_ptr<TypedefDecl> TypedefDeclPtr;
193 typedef ScopedMap< std::string, std::pair< TypedefDeclPtr, int > > TypedefMap;
194 typedef std::map< std::string, TypeDecl * > TypeDeclMap;
195 TypedefMap typedefNames;
196 TypeDeclMap typedeclNames;
197 int scopeLevel;
198 };
199
200 class VerifyCtorDtorAssign : public Visitor {
201 public:
202 /// ensure that constructors, destructors, and assignment have at least one
203 /// parameter, the first of which must be a pointer, and that ctor/dtors have no
204 /// return values.
205 static void verify( std::list< Declaration * > &translationUnit );
206
207 virtual void visit( FunctionDecl *funcDecl );
208 };
209
210 class ArrayLength : public Visitor {
211 public:
212 /// for array types without an explicit length, compute the length and store it so that it
213 /// is known to the rest of the phases. For example,
214 /// int x[] = { 1, 2, 3 };
215 /// int y[][2] = { { 1, 2, 3 }, { 1, 2, 3 } };
216 /// here x and y are known at compile-time to have length 3, so change this into
217 /// int x[3] = { 1, 2, 3 };
218 /// int y[3][2] = { { 1, 2, 3 }, { 1, 2, 3 } };
219 static void computeLength( std::list< Declaration * > & translationUnit );
220
221 virtual void visit( ObjectDecl * objDecl );
222 };
223
224 class CompoundLiteral final : public GenPoly::DeclMutator {
225 Type::StorageClasses storageClasses;
226
227 using GenPoly::DeclMutator::mutate;
228 DeclarationWithType * mutate( ObjectDecl *objectDecl ) final;
229 Expression *mutate( CompoundLiteralExpr *compLitExpr ) final;
230 };
231
232 void validate( std::list< Declaration * > &translationUnit, bool doDebug ) {
233 EnumAndPointerDecayPass epc;
234 LinkReferenceToTypes lrt( doDebug, 0 );
235 Pass3 pass3( 0 );
236 CompoundLiteral compoundliteral;
237
238 HoistStruct::hoistStruct( translationUnit );
239 EliminateTypedef::eliminateTypedef( translationUnit );
240 ReturnTypeFixer::fix( translationUnit ); // must happen before autogen
241 acceptAll( translationUnit, lrt ); // must happen before autogen, because sized flag needs to propagate to generated functions
242 Concurrency::applyKeywords( translationUnit );
243 autogenerateRoutines( translationUnit ); // moved up, used to be below compoundLiteral - currently needs EnumAndPointerDecayPass
244 Concurrency::implementMutexFuncs( translationUnit );
245 Concurrency::implementThreadStarter( translationUnit );
246 acceptAll( translationUnit, epc );
247 ReturnChecker::checkFunctionReturns( translationUnit );
248 compoundliteral.mutateDeclarationList( translationUnit );
249 acceptAll( translationUnit, pass3 );
250 VerifyCtorDtorAssign::verify( translationUnit );
251 ArrayLength::computeLength( translationUnit );
252 }
253
254 void validateType( Type *type, const Indexer *indexer ) {
255 EnumAndPointerDecayPass epc;
256 LinkReferenceToTypes lrt( false, indexer );
257 Pass3 pass3( indexer );
258 type->accept( epc );
259 type->accept( lrt );
260 type->accept( pass3 );
261 }
262
263 void HoistStruct::hoistStruct( std::list< Declaration * > &translationUnit ) {
264 HoistStruct hoister;
265 acceptAndAdd( translationUnit, hoister );
266 }
267
268 HoistStruct::HoistStruct() : inStruct( false ) {
269 }
270
271 void filter( std::list< Declaration * > &declList, bool (*pred)( Declaration * ), bool doDelete ) {
272 std::list< Declaration * >::iterator i = declList.begin();
273 while ( i != declList.end() ) {
274 std::list< Declaration * >::iterator next = i;
275 ++next;
276 if ( pred( *i ) ) {
277 if ( doDelete ) {
278 delete *i;
279 } // if
280 declList.erase( i );
281 } // if
282 i = next;
283 } // while
284 }
285
286 bool isStructOrUnion( Declaration *decl ) {
287 return dynamic_cast< StructDecl * >( decl ) || dynamic_cast< UnionDecl * >( decl );
288 }
289
290 template< typename AggDecl >
291 void HoistStruct::handleAggregate( AggDecl *aggregateDecl ) {
292 if ( inStruct ) {
293 // Add elements in stack order corresponding to nesting structure.
294 declsToAdd.push_front( aggregateDecl );
295 Visitor::visit( aggregateDecl );
296 } else {
297 inStruct = true;
298 Visitor::visit( aggregateDecl );
299 inStruct = false;
300 } // if
301 // Always remove the hoisted aggregate from the inner structure.
302 filter( aggregateDecl->get_members(), isStructOrUnion, false );
303 }
304
305 void HoistStruct::visit( EnumInstType *structInstType ) {
306 if ( structInstType->get_baseEnum() ) {
307 declsToAdd.push_front( structInstType->get_baseEnum() );
308 }
309 }
310
311 void HoistStruct::visit( StructInstType *structInstType ) {
312 if ( structInstType->get_baseStruct() ) {
313 declsToAdd.push_front( structInstType->get_baseStruct() );
314 }
315 }
316
317 void HoistStruct::visit( UnionInstType *structInstType ) {
318 if ( structInstType->get_baseUnion() ) {
319 declsToAdd.push_front( structInstType->get_baseUnion() );
320 }
321 }
322
323 void HoistStruct::visit( StructDecl *aggregateDecl ) {
324 handleAggregate( aggregateDecl );
325 }
326
327 void HoistStruct::visit( UnionDecl *aggregateDecl ) {
328 handleAggregate( aggregateDecl );
329 }
330
331 void HoistStruct::visit( CompoundStmt *compoundStmt ) {
332 addVisit( compoundStmt, *this );
333 }
334
335 void HoistStruct::visit( SwitchStmt *switchStmt ) {
336 addVisit( switchStmt, *this );
337 }
338
339 void EnumAndPointerDecayPass::visit( EnumDecl *enumDecl ) {
340 // Set the type of each member of the enumeration to be EnumConstant
341 for ( std::list< Declaration * >::iterator i = enumDecl->get_members().begin(); i != enumDecl->get_members().end(); ++i ) {
342 ObjectDecl * obj = dynamic_cast< ObjectDecl * >( *i );
343 assert( obj );
344 obj->set_type( new EnumInstType( Type::Qualifiers( Type::Const ), enumDecl->get_name() ) );
345 } // for
346 Parent::visit( enumDecl );
347 }
348
349 namespace {
350 template< typename DWTList >
351 void fixFunctionList( DWTList & dwts, FunctionType * func ) {
352 // the only case in which "void" is valid is where it is the only one in the list; then it should be removed
353 // entirely other fix ups are handled by the FixFunction class
354 typedef typename DWTList::iterator DWTIterator;
355 DWTIterator begin( dwts.begin() ), end( dwts.end() );
356 if ( begin == end ) return;
357 FixFunction fixer;
358 DWTIterator i = begin;
359 *i = (*i)->acceptMutator( fixer );
360 if ( fixer.get_isVoid() ) {
361 DWTIterator j = i;
362 ++i;
363 delete *j;
364 dwts.erase( j );
365 if ( i != end ) {
366 throw SemanticError( "invalid type void in function type ", func );
367 } // if
368 } else {
369 ++i;
370 for ( ; i != end; ++i ) {
371 FixFunction fixer;
372 *i = (*i )->acceptMutator( fixer );
373 if ( fixer.get_isVoid() ) {
374 throw SemanticError( "invalid type void in function type ", func );
375 } // if
376 } // for
377 } // if
378 }
379 }
380
381 void EnumAndPointerDecayPass::visit( FunctionType *func ) {
382 // Fix up parameters and return types
383 fixFunctionList( func->get_parameters(), func );
384 fixFunctionList( func->get_returnVals(), func );
385 Visitor::visit( func );
386 }
387
388 LinkReferenceToTypes::LinkReferenceToTypes( bool doDebug, const Indexer *other_indexer ) : Indexer( doDebug ) {
389 if ( other_indexer ) {
390 indexer = other_indexer;
391 } else {
392 indexer = this;
393 } // if
394 }
395
396 void LinkReferenceToTypes::visit( EnumInstType *enumInst ) {
397 Parent::visit( enumInst );
398 EnumDecl *st = indexer->lookupEnum( enumInst->get_name() );
399 // it's not a semantic error if the enum is not found, just an implicit forward declaration
400 if ( st ) {
401 //assert( ! enumInst->get_baseEnum() || enumInst->get_baseEnum()->get_members().empty() || ! st->get_members().empty() );
402 enumInst->set_baseEnum( st );
403 } // if
404 if ( ! st || st->get_members().empty() ) {
405 // use of forward declaration
406 forwardEnums[ enumInst->get_name() ].push_back( enumInst );
407 } // if
408 }
409
410 void LinkReferenceToTypes::visit( StructInstType *structInst ) {
411 Parent::visit( structInst );
412 StructDecl *st = indexer->lookupStruct( structInst->get_name() );
413 // it's not a semantic error if the struct is not found, just an implicit forward declaration
414 if ( st ) {
415 //assert( ! structInst->get_baseStruct() || structInst->get_baseStruct()->get_members().empty() || ! st->get_members().empty() );
416 structInst->set_baseStruct( st );
417 } // if
418 if ( ! st || st->get_members().empty() ) {
419 // use of forward declaration
420 forwardStructs[ structInst->get_name() ].push_back( structInst );
421 } // if
422 }
423
424 void LinkReferenceToTypes::visit( UnionInstType *unionInst ) {
425 Parent::visit( unionInst );
426 UnionDecl *un = indexer->lookupUnion( unionInst->get_name() );
427 // it's not a semantic error if the union is not found, just an implicit forward declaration
428 if ( un ) {
429 unionInst->set_baseUnion( un );
430 } // if
431 if ( ! un || un->get_members().empty() ) {
432 // use of forward declaration
433 forwardUnions[ unionInst->get_name() ].push_back( unionInst );
434 } // if
435 }
436
437 void LinkReferenceToTypes::visit( TraitInstType *traitInst ) {
438 Parent::visit( traitInst );
439 if ( traitInst->get_name() == "sized" ) {
440 // "sized" is a special trait with no members - just flick the sized status on for the type variable
441 if ( traitInst->get_parameters().size() != 1 ) {
442 throw SemanticError( "incorrect number of trait parameters: ", traitInst );
443 }
444 TypeExpr * param = safe_dynamic_cast< TypeExpr * > ( traitInst->get_parameters().front() );
445 TypeInstType * inst = safe_dynamic_cast< TypeInstType * > ( param->get_type() );
446 TypeDecl * decl = inst->get_baseType();
447 decl->set_sized( true );
448 // since "sized" is special, the next few steps don't apply
449 return;
450 }
451 TraitDecl *traitDecl = indexer->lookupTrait( traitInst->get_name() );
452 if ( ! traitDecl ) {
453 throw SemanticError( "use of undeclared trait " + traitInst->get_name() );
454 } // if
455 if ( traitDecl->get_parameters().size() != traitInst->get_parameters().size() ) {
456 throw SemanticError( "incorrect number of trait parameters: ", traitInst );
457 } // if
458
459 for ( TypeDecl * td : traitDecl->get_parameters() ) {
460 for ( DeclarationWithType * assert : td->get_assertions() ) {
461 traitInst->get_members().push_back( assert->clone() );
462 } // for
463 } // for
464
465 // need to clone members of the trait for ownership purposes
466 std::list< Declaration * > members;
467 std::transform( traitDecl->get_members().begin(), traitDecl->get_members().end(), back_inserter( members ), [](Declaration * dwt) { return dwt->clone(); } );
468
469 applySubstitution( traitDecl->get_parameters().begin(), traitDecl->get_parameters().end(), traitInst->get_parameters().begin(), members.begin(), members.end(), back_inserter( traitInst->get_members() ) );
470
471 // need to carry over the 'sized' status of each decl in the instance
472 for ( auto p : group_iterate( traitDecl->get_parameters(), traitInst->get_parameters() ) ) {
473 TypeExpr * expr = safe_dynamic_cast< TypeExpr * >( std::get<1>(p) );
474 if ( TypeInstType * inst = dynamic_cast< TypeInstType * >( expr->get_type() ) ) {
475 TypeDecl * formalDecl = std::get<0>(p);
476 TypeDecl * instDecl = inst->get_baseType();
477 if ( formalDecl->get_sized() ) instDecl->set_sized( true );
478 }
479 }
480 }
481
482 void LinkReferenceToTypes::visit( EnumDecl *enumDecl ) {
483 // visit enum members first so that the types of self-referencing members are updated properly
484 Parent::visit( enumDecl );
485 if ( ! enumDecl->get_members().empty() ) {
486 ForwardEnumsType::iterator fwds = forwardEnums.find( enumDecl->get_name() );
487 if ( fwds != forwardEnums.end() ) {
488 for ( std::list< EnumInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
489 (*inst )->set_baseEnum( enumDecl );
490 } // for
491 forwardEnums.erase( fwds );
492 } // if
493 } // if
494 }
495
496 void LinkReferenceToTypes::visit( StructDecl *structDecl ) {
497 // visit struct members first so that the types of self-referencing members are updated properly
498 Parent::visit( structDecl );
499 if ( ! structDecl->get_members().empty() ) {
500 ForwardStructsType::iterator fwds = forwardStructs.find( structDecl->get_name() );
501 if ( fwds != forwardStructs.end() ) {
502 for ( std::list< StructInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
503 (*inst )->set_baseStruct( structDecl );
504 } // for
505 forwardStructs.erase( fwds );
506 } // if
507 } // if
508 }
509
510 void LinkReferenceToTypes::visit( UnionDecl *unionDecl ) {
511 Parent::visit( unionDecl );
512 if ( ! unionDecl->get_members().empty() ) {
513 ForwardUnionsType::iterator fwds = forwardUnions.find( unionDecl->get_name() );
514 if ( fwds != forwardUnions.end() ) {
515 for ( std::list< UnionInstType * >::iterator inst = fwds->second.begin(); inst != fwds->second.end(); ++inst ) {
516 (*inst )->set_baseUnion( unionDecl );
517 } // for
518 forwardUnions.erase( fwds );
519 } // if
520 } // if
521 }
522
523 void LinkReferenceToTypes::visit( TypeInstType *typeInst ) {
524 if ( NamedTypeDecl *namedTypeDecl = lookupType( typeInst->get_name() ) ) {
525 if ( TypeDecl *typeDecl = dynamic_cast< TypeDecl * >( namedTypeDecl ) ) {
526 typeInst->set_isFtype( typeDecl->get_kind() == TypeDecl::Ftype );
527 } // if
528 } // if
529 }
530
531 Pass3::Pass3( const Indexer *other_indexer ) : Indexer( false ) {
532 if ( other_indexer ) {
533 indexer = other_indexer;
534 } else {
535 indexer = this;
536 } // if
537 }
538
539 /// Fix up assertions - flattens assertion lists, removing all trait instances
540 void forallFixer( Type * func ) {
541 for ( TypeDecl * type : func->get_forall() ) {
542 std::list< DeclarationWithType * > toBeDone, nextRound;
543 toBeDone.splice( toBeDone.end(), type->get_assertions() );
544 while ( ! toBeDone.empty() ) {
545 for ( DeclarationWithType * assertion : toBeDone ) {
546 if ( TraitInstType *traitInst = dynamic_cast< TraitInstType * >( assertion->get_type() ) ) {
547 // expand trait instance into all of its members
548 for ( Declaration * member : traitInst->get_members() ) {
549 DeclarationWithType *dwt = safe_dynamic_cast< DeclarationWithType * >( member );
550 nextRound.push_back( dwt->clone() );
551 }
552 delete traitInst;
553 } else {
554 // pass assertion through
555 FixFunction fixer;
556 assertion = assertion->acceptMutator( fixer );
557 if ( fixer.get_isVoid() ) {
558 throw SemanticError( "invalid type void in assertion of function ", func );
559 }
560 type->get_assertions().push_back( assertion );
561 } // if
562 } // for
563 toBeDone.clear();
564 toBeDone.splice( toBeDone.end(), nextRound );
565 } // while
566 } // for
567 }
568
569 void Pass3::visit( ObjectDecl *object ) {
570 forallFixer( object->get_type() );
571 if ( PointerType *pointer = dynamic_cast< PointerType * >( object->get_type() ) ) {
572 forallFixer( pointer->get_base() );
573 } // if
574 Parent::visit( object );
575 object->fixUniqueId();
576 }
577
578 void Pass3::visit( FunctionDecl *func ) {
579 forallFixer( func->get_type() );
580 Parent::visit( func );
581 func->fixUniqueId();
582 }
583
584 void ReturnChecker::checkFunctionReturns( std::list< Declaration * > & translationUnit ) {
585 ReturnChecker checker;
586 acceptAll( translationUnit, checker );
587 }
588
589 void ReturnChecker::visit( FunctionDecl * functionDecl ) {
590 std::list< DeclarationWithType * > oldReturnVals = returnVals;
591 returnVals = functionDecl->get_functionType()->get_returnVals();
592 Visitor::visit( functionDecl );
593 returnVals = oldReturnVals;
594 }
595
596 void ReturnChecker::visit( ReturnStmt * returnStmt ) {
597 // Previously this also checked for the existence of an expr paired with no return values on
598 // the function return type. This is incorrect, since you can have an expression attached to
599 // a return statement in a void-returning function in C. The expression is treated as if it
600 // were cast to void.
601 if ( returnStmt->get_expr() == NULL && returnVals.size() != 0 ) {
602 throw SemanticError( "Non-void function returns no values: " , returnStmt );
603 }
604 }
605
606
607 bool isTypedef( Declaration *decl ) {
608 return dynamic_cast< TypedefDecl * >( decl );
609 }
610
611 void EliminateTypedef::eliminateTypedef( std::list< Declaration * > &translationUnit ) {
612 EliminateTypedef eliminator;
613 mutateAll( translationUnit, eliminator );
614 if ( eliminator.typedefNames.count( "size_t" ) ) {
615 // grab and remember declaration of size_t
616 SizeType = eliminator.typedefNames["size_t"].first->get_base()->clone();
617 } else {
618 // xxx - missing global typedef for size_t - default to long unsigned int, even though that may be wrong
619 // eventually should have a warning for this case.
620 SizeType = new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt );
621 }
622 filter( translationUnit, isTypedef, true );
623
624 }
625
626 Type *EliminateTypedef::mutate( TypeInstType * typeInst ) {
627 // instances of typedef types will come here. If it is an instance
628 // of a typdef type, link the instance to its actual type.
629 TypedefMap::const_iterator def = typedefNames.find( typeInst->get_name() );
630 if ( def != typedefNames.end() ) {
631 Type *ret = def->second.first->get_base()->clone();
632 ret->get_qualifiers() |= typeInst->get_qualifiers();
633 // place instance parameters on the typedef'd type
634 if ( ! typeInst->get_parameters().empty() ) {
635 ReferenceToType *rtt = dynamic_cast<ReferenceToType*>(ret);
636 if ( ! rtt ) {
637 throw SemanticError("cannot apply type parameters to base type of " + typeInst->get_name());
638 }
639 rtt->get_parameters().clear();
640 cloneAll( typeInst->get_parameters(), rtt->get_parameters() );
641 mutateAll( rtt->get_parameters(), *this ); // recursively fix typedefs on parameters
642 } // if
643 delete typeInst;
644 return ret;
645 } else {
646 TypeDeclMap::const_iterator base = typedeclNames.find( typeInst->get_name() );
647 assertf( base != typedeclNames.end(), "Can't find typedecl name %s", typeInst->get_name().c_str() );
648 typeInst->set_baseType( base->second );
649 } // if
650 return typeInst;
651 }
652
653 Declaration *EliminateTypedef::mutate( TypedefDecl * tyDecl ) {
654 Declaration *ret = Mutator::mutate( tyDecl );
655
656 if ( typedefNames.count( tyDecl->get_name() ) == 1 && typedefNames[ tyDecl->get_name() ].second == scopeLevel ) {
657 // typedef to the same name from the same scope
658 // must be from the same type
659
660 Type * t1 = tyDecl->get_base();
661 Type * t2 = typedefNames[ tyDecl->get_name() ].first->get_base();
662 if ( ! ResolvExpr::typesCompatible( t1, t2, Indexer() ) ) {
663 throw SemanticError( "cannot redefine typedef: " + tyDecl->get_name() );
664 }
665 } else {
666 typedefNames[ tyDecl->get_name() ] = std::make_pair( TypedefDeclPtr( tyDecl ), scopeLevel );
667 } // if
668
669 // When a typedef is a forward declaration:
670 // typedef struct screen SCREEN;
671 // the declaration portion must be retained:
672 // struct screen;
673 // because the expansion of the typedef is:
674 // void rtn( SCREEN *p ) => void rtn( struct screen *p )
675 // hence the type-name "screen" must be defined.
676 // Note, qualifiers on the typedef are superfluous for the forward declaration.
677
678 Type *designatorType = tyDecl->get_base()->stripDeclarator();
679 if ( StructInstType *aggDecl = dynamic_cast< StructInstType * >( designatorType ) ) {
680 return new StructDecl( aggDecl->get_name() );
681 } else if ( UnionInstType *aggDecl = dynamic_cast< UnionInstType * >( designatorType ) ) {
682 return new UnionDecl( aggDecl->get_name() );
683 } else if ( EnumInstType *enumDecl = dynamic_cast< EnumInstType * >( designatorType ) ) {
684 return new EnumDecl( enumDecl->get_name() );
685 } else {
686 return ret->clone();
687 } // if
688 }
689
690 TypeDecl *EliminateTypedef::mutate( TypeDecl * typeDecl ) {
691 TypedefMap::iterator i = typedefNames.find( typeDecl->get_name() );
692 if ( i != typedefNames.end() ) {
693 typedefNames.erase( i ) ;
694 } // if
695
696 typedeclNames[ typeDecl->get_name() ] = typeDecl;
697 return Mutator::mutate( typeDecl );
698 }
699
700 DeclarationWithType *EliminateTypedef::mutate( FunctionDecl * funcDecl ) {
701 typedefNames.beginScope();
702 DeclarationWithType *ret = Mutator::mutate( funcDecl );
703 typedefNames.endScope();
704 return ret;
705 }
706
707 DeclarationWithType *EliminateTypedef::mutate( ObjectDecl * objDecl ) {
708 typedefNames.beginScope();
709 DeclarationWithType *ret = Mutator::mutate( objDecl );
710 typedefNames.endScope();
711
712 if ( FunctionType *funtype = dynamic_cast<FunctionType *>( ret->get_type() ) ) { // function type?
713 // replace the current object declaration with a function declaration
714 FunctionDecl * newDecl = new FunctionDecl( ret->get_name(), ret->get_storageClasses(), ret->get_linkage(), funtype, 0, objDecl->get_attributes(), ret->get_funcSpec() );
715 objDecl->get_attributes().clear();
716 objDecl->set_type( nullptr );
717 delete objDecl;
718 return newDecl;
719 } // if
720 return ret;
721 }
722
723 Expression *EliminateTypedef::mutate( CastExpr * castExpr ) {
724 typedefNames.beginScope();
725 Expression *ret = Mutator::mutate( castExpr );
726 typedefNames.endScope();
727 return ret;
728 }
729
730 CompoundStmt *EliminateTypedef::mutate( CompoundStmt * compoundStmt ) {
731 typedefNames.beginScope();
732 scopeLevel += 1;
733 CompoundStmt *ret = Mutator::mutate( compoundStmt );
734 scopeLevel -= 1;
735 std::list< Statement * >::iterator i = compoundStmt->get_kids().begin();
736 while ( i != compoundStmt->get_kids().end() ) {
737 std::list< Statement * >::iterator next = i+1;
738 if ( DeclStmt *declStmt = dynamic_cast< DeclStmt * >( *i ) ) {
739 if ( dynamic_cast< TypedefDecl * >( declStmt->get_decl() ) ) {
740 delete *i;
741 compoundStmt->get_kids().erase( i );
742 } // if
743 } // if
744 i = next;
745 } // while
746 typedefNames.endScope();
747 return ret;
748 }
749
750 // there may be typedefs nested within aggregates. in order for everything to work properly, these should be removed
751 // as well
752 template<typename AggDecl>
753 AggDecl *EliminateTypedef::handleAggregate( AggDecl * aggDecl ) {
754 std::list<Declaration *>::iterator it = aggDecl->get_members().begin();
755 for ( ; it != aggDecl->get_members().end(); ) {
756 std::list< Declaration * >::iterator next = it+1;
757 if ( dynamic_cast< TypedefDecl * >( *it ) ) {
758 delete *it;
759 aggDecl->get_members().erase( it );
760 } // if
761 it = next;
762 }
763 return aggDecl;
764 }
765
766 template<typename AggDecl>
767 void EliminateTypedef::addImplicitTypedef( AggDecl * aggDecl ) {
768 if ( typedefNames.count( aggDecl->get_name() ) == 0 ) {
769 Type *type = nullptr;
770 if ( StructDecl * newDeclStructDecl = dynamic_cast< StructDecl * >( aggDecl ) ) {
771 type = new StructInstType( Type::Qualifiers(), newDeclStructDecl->get_name() );
772 } else if ( UnionDecl * newDeclUnionDecl = dynamic_cast< UnionDecl * >( aggDecl ) ) {
773 type = new UnionInstType( Type::Qualifiers(), newDeclUnionDecl->get_name() );
774 } else if ( EnumDecl * newDeclEnumDecl = dynamic_cast< EnumDecl * >( aggDecl ) ) {
775 type = new EnumInstType( Type::Qualifiers(), newDeclEnumDecl->get_name() );
776 } // if
777 TypedefDeclPtr tyDecl( new TypedefDecl( aggDecl->get_name(), Type::StorageClasses(), type ) );
778 typedefNames[ aggDecl->get_name() ] = std::make_pair( std::move( tyDecl ), scopeLevel );
779 } // if
780 }
781
782 Declaration *EliminateTypedef::mutate( StructDecl * structDecl ) {
783 addImplicitTypedef( structDecl );
784 Mutator::mutate( structDecl );
785 return handleAggregate( structDecl );
786 }
787
788 Declaration *EliminateTypedef::mutate( UnionDecl * unionDecl ) {
789 addImplicitTypedef( unionDecl );
790 Mutator::mutate( unionDecl );
791 return handleAggregate( unionDecl );
792 }
793
794 Declaration *EliminateTypedef::mutate( EnumDecl * enumDecl ) {
795 addImplicitTypedef( enumDecl );
796 Mutator::mutate( enumDecl );
797 return handleAggregate( enumDecl );
798 }
799
800 Declaration *EliminateTypedef::mutate( TraitDecl * contextDecl ) {
801 Mutator::mutate( contextDecl );
802 return handleAggregate( contextDecl );
803 }
804
805 void VerifyCtorDtorAssign::verify( std::list< Declaration * > & translationUnit ) {
806 VerifyCtorDtorAssign verifier;
807 acceptAll( translationUnit, verifier );
808 }
809
810 void VerifyCtorDtorAssign::visit( FunctionDecl * funcDecl ) {
811 FunctionType * funcType = funcDecl->get_functionType();
812 std::list< DeclarationWithType * > &returnVals = funcType->get_returnVals();
813 std::list< DeclarationWithType * > &params = funcType->get_parameters();
814
815 if ( InitTweak::isCtorDtorAssign( funcDecl->get_name() ) ) {
816 if ( params.size() == 0 ) {
817 throw SemanticError( "Constructors, destructors, and assignment functions require at least one parameter ", funcDecl );
818 }
819 if ( ! dynamic_cast< PointerType * >( params.front()->get_type() ) ) {
820 throw SemanticError( "First parameter of a constructor, destructor, or assignment function must be a pointer ", funcDecl );
821 }
822 if ( InitTweak::isCtorDtor( funcDecl->get_name() ) && returnVals.size() != 0 ) {
823 throw SemanticError( "Constructors and destructors cannot have explicit return values ", funcDecl );
824 }
825 }
826
827 Visitor::visit( funcDecl );
828 }
829
830 DeclarationWithType * CompoundLiteral::mutate( ObjectDecl *objectDecl ) {
831 storageClasses = objectDecl->get_storageClasses();
832 DeclarationWithType * temp = Mutator::mutate( objectDecl );
833 return temp;
834 }
835
836 Expression *CompoundLiteral::mutate( CompoundLiteralExpr *compLitExpr ) {
837 // transform [storage_class] ... (struct S){ 3, ... };
838 // into [storage_class] struct S temp = { 3, ... };
839 static UniqueName indexName( "_compLit" );
840
841 ObjectDecl *tempvar = new ObjectDecl( indexName.newName(), storageClasses, LinkageSpec::C, 0, compLitExpr->get_result(), compLitExpr->get_initializer() );
842 compLitExpr->set_result( 0 );
843 compLitExpr->set_initializer( 0 );
844 delete compLitExpr;
845 DeclarationWithType * newtempvar = mutate( tempvar );
846 addDeclaration( newtempvar ); // add modified temporary to current block
847 return new VariableExpr( newtempvar );
848 }
849
850 void ReturnTypeFixer::fix( std::list< Declaration * > &translationUnit ) {
851 ReturnTypeFixer fixer;
852 acceptAll( translationUnit, fixer );
853 }
854
855 void ReturnTypeFixer::visit( FunctionDecl * functionDecl ) {
856 Parent::visit( functionDecl );
857 FunctionType * ftype = functionDecl->get_functionType();
858 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
859 assertf( retVals.size() == 0 || retVals.size() == 1, "Function %s has too many return values: %d", functionDecl->get_name().c_str(), retVals.size() );
860 if ( retVals.size() == 1 ) {
861 // 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).
862 // ensure other return values have a name.
863 DeclarationWithType * ret = retVals.front();
864 if ( ret->get_name() == "" ) {
865 ret->set_name( toString( "_retval_", CodeGen::genName( functionDecl ) ) );
866 }
867 }
868 }
869
870 void ReturnTypeFixer::visit( FunctionType * ftype ) {
871 // xxx - need to handle named return values - this information needs to be saved somehow
872 // so that resolution has access to the names.
873 // Note that this pass needs to happen early so that other passes which look for tuple types
874 // find them in all of the right places, including function return types.
875 std::list< DeclarationWithType * > & retVals = ftype->get_returnVals();
876 if ( retVals.size() > 1 ) {
877 // generate a single return parameter which is the tuple of all of the return values
878 TupleType * tupleType = safe_dynamic_cast< TupleType * >( ResolvExpr::extractResultType( ftype ) );
879 // ensure return value is not destructed by explicitly creating an empty ListInit node wherein maybeConstruct is false.
880 ObjectDecl * newRet = new ObjectDecl( "", Type::StorageClasses(), LinkageSpec::Cforall, 0, tupleType, new ListInit( std::list<Initializer*>(), noDesignators, false ) );
881 deleteAll( retVals );
882 retVals.clear();
883 retVals.push_back( newRet );
884 }
885 }
886
887 void ArrayLength::computeLength( std::list< Declaration * > & translationUnit ) {
888 ArrayLength len;
889 acceptAll( translationUnit, len );
890 }
891
892 void ArrayLength::visit( ObjectDecl * objDecl ) {
893 if ( ArrayType * at = dynamic_cast< ArrayType * >( objDecl->get_type() ) ) {
894 if ( at->get_dimension() != nullptr ) return;
895 if ( ListInit * init = dynamic_cast< ListInit * >( objDecl->get_init() ) ) {
896 at->set_dimension( new ConstantExpr( Constant::from_ulong( init->get_initializers().size() ) ) );
897 }
898 }
899 }
900} // namespace SymTab
901
902// Local Variables: //
903// tab-width: 4 //
904// mode: c++ //
905// compile-command: "make install" //
906// End: //
Note: See TracBrowser for help on using the repository browser.