source: src/SymTab/Indexer.cc@ d88f256a

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 d88f256a was ee1635c8, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

automatically hide generated assignment functions following the same rules as ctor/dtors
  • Property mode set to 100644
File size: 31.9 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// Indexer.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Sun May 17 21:37:33 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Tue Jul 12 17:47:47 2016
13// Update Count : 12
14//
15
16#include "Indexer.h"
17
18#include <string>
19#include <typeinfo>
20#include <unordered_map>
21#include <unordered_set>
22#include <utility>
23#include <algorithm>
24
25#include "Mangler.h"
26
27#include "Common/utility.h"
28
29#include "ResolvExpr/typeops.h"
30
31#include "SynTree/Declaration.h"
32#include "SynTree/Type.h"
33#include "SynTree/Expression.h"
34#include "SynTree/Initializer.h"
35#include "SynTree/Statement.h"
36
37#include "InitTweak/InitTweak.h"
38
39#define debugPrint(x) if ( doDebug ) { std::cout << x; }
40
41namespace SymTab {
42 template< typename Container, typename VisitorType >
43 inline void acceptAllNewScope( Container &container, VisitorType &visitor ) {
44 visitor.enterScope();
45 acceptAll( container, visitor );
46 visitor.leaveScope();
47 }
48
49 typedef std::unordered_map< std::string, DeclarationWithType* > MangleTable;
50 typedef std::unordered_map< std::string, MangleTable > IdTable;
51 typedef std::unordered_map< std::string, NamedTypeDecl* > TypeTable;
52 typedef std::unordered_map< std::string, StructDecl* > StructTable;
53 typedef std::unordered_map< std::string, EnumDecl* > EnumTable;
54 typedef std::unordered_map< std::string, UnionDecl* > UnionTable;
55 typedef std::unordered_map< std::string, TraitDecl* > TraitTable;
56
57 void dump( const IdTable &table, std::ostream &os ) {
58 for ( IdTable::const_iterator id = table.begin(); id != table.end(); ++id ) {
59 for ( MangleTable::const_iterator mangle = id->second.begin(); mangle != id->second.end(); ++mangle ) {
60 os << mangle->second << std::endl;
61 }
62 }
63 }
64
65 template< typename Decl >
66 void dump( const std::unordered_map< std::string, Decl* > &table, std::ostream &os ) {
67 for ( typename std::unordered_map< std::string, Decl* >::const_iterator it = table.begin(); it != table.end(); ++it ) {
68 os << it->second << std::endl;
69 } // for
70 }
71
72 struct Indexer::Impl {
73 Impl( unsigned long _scope ) : refCount(1), scope( _scope ), size( 0 ), base(),
74 idTable(), typeTable(), structTable(), enumTable(), unionTable(), traitTable() {}
75 Impl( unsigned long _scope, Indexer &&_base ) : refCount(1), scope( _scope ), size( 0 ), base( _base ),
76 idTable(), typeTable(), structTable(), enumTable(), unionTable(), traitTable() {}
77 unsigned long refCount; ///< Number of references to these tables
78 unsigned long scope; ///< Scope these tables are associated with
79 unsigned long size; ///< Number of elements stored in this table
80 const Indexer base; ///< Base indexer this extends
81
82 IdTable idTable; ///< Identifier namespace
83 TypeTable typeTable; ///< Type namespace
84 StructTable structTable; ///< Struct namespace
85 EnumTable enumTable; ///< Enum namespace
86 UnionTable unionTable; ///< Union namespace
87 TraitTable traitTable; ///< Trait namespace
88 };
89
90 Indexer::Impl *Indexer::newRef( Indexer::Impl *toClone ) {
91 if ( ! toClone ) return 0;
92
93 // shorten the search chain by skipping empty links
94 Indexer::Impl *ret = toClone->size == 0 ? toClone->base.tables : toClone;
95 if ( ret ) { ++ret->refCount; }
96
97 return ret;
98 }
99
100 void Indexer::deleteRef( Indexer::Impl *toFree ) {
101 if ( ! toFree ) return;
102
103 if ( --toFree->refCount == 0 ) delete toFree;
104 }
105
106 void Indexer::removeSpecialOverrides( const std::string &id, std::list< DeclarationWithType * > & out ) const {
107 // only need to perform this step for constructors, destructors, and assignment functions
108 if ( ! InitTweak::isCtorDtorAssign( id ) ) return;
109
110 // helpful data structure
111 struct ValueType {
112 struct DeclBall {
113 FunctionDecl * decl;
114 bool isUserDefinedFunc; // properties for this particular decl
115 bool isDefaultFunc;
116 bool isCopyFunc;
117 };
118 // properties for this type
119 bool userDefinedFunc = false; // any user defined function found
120 bool userDefinedDefaultFunc = false; // user defined default ctor found
121 bool userDefinedCopyFunc = false; // user defined copy ctor found
122 std::list< DeclBall > decls;
123
124 // another FunctionDecl for the current type was found - determine
125 // if it has special properties and update data structure accordingly
126 ValueType & operator+=( FunctionDecl * function ) {
127 bool isUserDefinedFunc = ! LinkageSpec::isOverridable( function->get_linkage() );
128 bool isDefaultFunc = function->get_functionType()->get_parameters().size() == 1;
129 bool isCopyFunc = InitTweak::isCopyFunction( function, function->get_name() );
130 decls.push_back( DeclBall{ function, isUserDefinedFunc, isDefaultFunc, isCopyFunc } );
131 userDefinedFunc = userDefinedFunc || isUserDefinedFunc;
132 userDefinedDefaultFunc = userDefinedDefaultFunc || (isUserDefinedFunc && isDefaultFunc);
133 userDefinedCopyFunc = userDefinedCopyFunc || (isUserDefinedFunc && isCopyFunc);
134 return *this;
135 }
136 }; // ValueType
137
138 std::list< DeclarationWithType * > copy;
139 copy.splice( copy.end(), out );
140
141 // organize discovered declarations by type
142 std::unordered_map< std::string, ValueType > funcMap;
143 for ( DeclarationWithType * decl : copy ) {
144 if ( FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl ) ) {
145 std::list< DeclarationWithType * > params = function->get_functionType()->get_parameters();
146 assert( ! params.empty() );
147 // use base type of pointer, so that qualifiers on the pointer type aren't considered.
148 Type * base = safe_dynamic_cast< PointerType * >( params.front()->get_type() )->get_base();
149 funcMap[ Mangler::mangle( base ) ] += function;
150 } else {
151 out.push_back( decl );
152 }
153 }
154
155 // if a type contains user defined ctor/dtors, then special rules trigger, which determine
156 // the set of ctor/dtors that are seen by the requester. In particular, if the user defines
157 // a default ctor, then the generated default ctor should never be seen, likewise for copy ctor
158 // and dtor. If the user defines any ctor/dtor, then no generated field ctors should be seen.
159 for ( std::pair< const std::string, ValueType > & pair : funcMap ) {
160 ValueType & val = pair.second;
161 for ( ValueType::DeclBall ball : val.decls ) {
162 if ( ! val.userDefinedFunc || ball.isUserDefinedFunc || (! val.userDefinedDefaultFunc && ball.isDefaultFunc) || (! val.userDefinedCopyFunc && ball.isCopyFunc) ) {
163 // decl conforms to the rules described above, so it should be seen by the requester
164 out.push_back( ball.decl );
165 }
166 }
167 }
168 }
169
170 void Indexer::makeWritable() {
171 if ( ! tables ) {
172 // create indexer if not yet set
173 tables = new Indexer::Impl( scope );
174 } else if ( tables->refCount > 1 || tables->scope != scope ) {
175 // make this indexer the base of a fresh indexer at the current scope
176 tables = new Indexer::Impl( scope, std::move( *this ) );
177 }
178 }
179
180 Indexer::Indexer( bool _doDebug ) : tables( 0 ), scope( 0 ), doDebug( _doDebug ) {}
181
182 Indexer::Indexer( const Indexer &that ) : tables( newRef( that.tables ) ), scope( that.scope ), doDebug( that.doDebug ) {}
183
184 Indexer::Indexer( Indexer &&that ) : tables( that.tables ), scope( that.scope ), doDebug( that.doDebug ) {
185 that.tables = 0;
186 }
187
188 Indexer::~Indexer() {
189 deleteRef( tables );
190 }
191
192 Indexer& Indexer::operator= ( const Indexer &that ) {
193 deleteRef( tables );
194
195 tables = newRef( that.tables );
196 scope = that.scope;
197 doDebug = that.doDebug;
198
199 return *this;
200 }
201
202 Indexer& Indexer::operator= ( Indexer &&that ) {
203 deleteRef( tables );
204
205 tables = that.tables;
206 scope = that.scope;
207 doDebug = that.doDebug;
208
209 that.tables = 0;
210
211 return *this;
212 }
213
214 void Indexer::visit( ObjectDecl *objectDecl ) {
215 enterScope();
216 maybeAccept( objectDecl->get_type(), *this );
217 leaveScope();
218 maybeAccept( objectDecl->get_init(), *this );
219 maybeAccept( objectDecl->get_bitfieldWidth(), *this );
220 if ( objectDecl->get_name() != "" ) {
221 debugPrint( "Adding object " << objectDecl->get_name() << std::endl );
222 addId( objectDecl );
223 } // if
224 }
225
226 void Indexer::visit( FunctionDecl *functionDecl ) {
227 if ( functionDecl->get_name() == "" ) return;
228 debugPrint( "Adding function " << functionDecl->get_name() << std::endl );
229 addId( functionDecl );
230 enterScope();
231 maybeAccept( functionDecl->get_functionType(), *this );
232 acceptAll( functionDecl->get_oldDecls(), *this );
233 maybeAccept( functionDecl->get_statements(), *this );
234 leaveScope();
235 }
236
237
238// A NOTE ON THE ORDER OF TRAVERSAL
239//
240// Types and typedefs have their base types visited before they are added to the type table. This is ok, since there is
241// no such thing as a recursive type or typedef.
242//
243// typedef struct { T *x; } T; // never allowed
244//
245// for structs/unions, it is possible to have recursion, so the decl should be added as if it's incomplete to begin, the
246// members are traversed, and then the complete type should be added (assuming the type is completed by this particular
247// declaration).
248//
249// struct T { struct T *x; }; // allowed
250//
251// It is important to add the complete type to the symbol table *after* the members/base has been traversed, since that
252// traversal may modify the definition of the type and these modifications should be visible when the symbol table is
253// queried later in this pass.
254//
255// TODO: figure out whether recursive contexts are sensible/possible/reasonable.
256
257
258 void Indexer::visit( TypeDecl *typeDecl ) {
259 // see A NOTE ON THE ORDER OF TRAVERSAL, above
260 // note that assertions come after the type is added to the symtab, since they are not part of the type proper
261 // and may depend on the type itself
262 enterScope();
263 acceptAll( typeDecl->get_parameters(), *this );
264 maybeAccept( typeDecl->get_base(), *this );
265 leaveScope();
266 debugPrint( "Adding type " << typeDecl->get_name() << std::endl );
267 addType( typeDecl );
268 acceptAll( typeDecl->get_assertions(), *this );
269 }
270
271 void Indexer::visit( TypedefDecl *typeDecl ) {
272 enterScope();
273 acceptAll( typeDecl->get_parameters(), *this );
274 maybeAccept( typeDecl->get_base(), *this );
275 leaveScope();
276 debugPrint( "Adding typedef " << typeDecl->get_name() << std::endl );
277 addType( typeDecl );
278 }
279
280 void Indexer::visit( StructDecl *aggregateDecl ) {
281 // make up a forward declaration and add it before processing the members
282 // needs to be on the heap because addStruct saves the pointer
283 StructDecl &fwdDecl = *new StructDecl( aggregateDecl->get_name() );
284 cloneAll( aggregateDecl->get_parameters(), fwdDecl.get_parameters() );
285 debugPrint( "Adding fwd decl for struct " << fwdDecl.get_name() << std::endl );
286 addStruct( &fwdDecl );
287
288 enterScope();
289 acceptAll( aggregateDecl->get_parameters(), *this );
290 acceptAll( aggregateDecl->get_members(), *this );
291 leaveScope();
292
293 debugPrint( "Adding struct " << aggregateDecl->get_name() << std::endl );
294 // this addition replaces the forward declaration
295 addStruct( aggregateDecl );
296 }
297
298 void Indexer::visit( UnionDecl *aggregateDecl ) {
299 // make up a forward declaration and add it before processing the members
300 UnionDecl fwdDecl( aggregateDecl->get_name() );
301 cloneAll( aggregateDecl->get_parameters(), fwdDecl.get_parameters() );
302 debugPrint( "Adding fwd decl for union " << fwdDecl.get_name() << std::endl );
303 addUnion( &fwdDecl );
304
305 enterScope();
306 acceptAll( aggregateDecl->get_parameters(), *this );
307 acceptAll( aggregateDecl->get_members(), *this );
308 leaveScope();
309
310 debugPrint( "Adding union " << aggregateDecl->get_name() << std::endl );
311 addUnion( aggregateDecl );
312 }
313
314 void Indexer::visit( EnumDecl *aggregateDecl ) {
315 debugPrint( "Adding enum " << aggregateDecl->get_name() << std::endl );
316 addEnum( aggregateDecl );
317 // unlike structs, contexts, and unions, enums inject their members into the global scope
318 acceptAll( aggregateDecl->get_members(), *this );
319 }
320
321 void Indexer::visit( TraitDecl *aggregateDecl ) {
322 enterScope();
323 acceptAll( aggregateDecl->get_parameters(), *this );
324 acceptAll( aggregateDecl->get_members(), *this );
325 leaveScope();
326
327 debugPrint( "Adding context " << aggregateDecl->get_name() << std::endl );
328 addTrait( aggregateDecl );
329 }
330
331 void Indexer::visit( CompoundStmt *compoundStmt ) {
332 enterScope();
333 acceptAll( compoundStmt->get_kids(), *this );
334 leaveScope();
335 }
336
337
338 void Indexer::visit( ApplicationExpr *applicationExpr ) {
339 acceptAllNewScope( applicationExpr->get_results(), *this );
340 maybeAccept( applicationExpr->get_function(), *this );
341 acceptAll( applicationExpr->get_args(), *this );
342 }
343
344 void Indexer::visit( UntypedExpr *untypedExpr ) {
345 acceptAllNewScope( untypedExpr->get_results(), *this );
346 acceptAll( untypedExpr->get_args(), *this );
347 }
348
349 void Indexer::visit( NameExpr *nameExpr ) {
350 acceptAllNewScope( nameExpr->get_results(), *this );
351 }
352
353 void Indexer::visit( AddressExpr *addressExpr ) {
354 acceptAllNewScope( addressExpr->get_results(), *this );
355 maybeAccept( addressExpr->get_arg(), *this );
356 }
357
358 void Indexer::visit( LabelAddressExpr *labAddressExpr ) {
359 acceptAllNewScope( labAddressExpr->get_results(), *this );
360 maybeAccept( labAddressExpr->get_arg(), *this );
361 }
362
363 void Indexer::visit( CastExpr *castExpr ) {
364 acceptAllNewScope( castExpr->get_results(), *this );
365 maybeAccept( castExpr->get_arg(), *this );
366 }
367
368 void Indexer::visit( UntypedMemberExpr *memberExpr ) {
369 acceptAllNewScope( memberExpr->get_results(), *this );
370 maybeAccept( memberExpr->get_aggregate(), *this );
371 }
372
373 void Indexer::visit( MemberExpr *memberExpr ) {
374 acceptAllNewScope( memberExpr->get_results(), *this );
375 maybeAccept( memberExpr->get_aggregate(), *this );
376 }
377
378 void Indexer::visit( VariableExpr *variableExpr ) {
379 acceptAllNewScope( variableExpr->get_results(), *this );
380 }
381
382 void Indexer::visit( ConstantExpr *constantExpr ) {
383 acceptAllNewScope( constantExpr->get_results(), *this );
384 maybeAccept( constantExpr->get_constant(), *this );
385 }
386
387 void Indexer::visit( SizeofExpr *sizeofExpr ) {
388 acceptAllNewScope( sizeofExpr->get_results(), *this );
389 if ( sizeofExpr->get_isType() ) {
390 maybeAccept( sizeofExpr->get_type(), *this );
391 } else {
392 maybeAccept( sizeofExpr->get_expr(), *this );
393 }
394 }
395
396 void Indexer::visit( AlignofExpr *alignofExpr ) {
397 acceptAllNewScope( alignofExpr->get_results(), *this );
398 if ( alignofExpr->get_isType() ) {
399 maybeAccept( alignofExpr->get_type(), *this );
400 } else {
401 maybeAccept( alignofExpr->get_expr(), *this );
402 }
403 }
404
405 void Indexer::visit( UntypedOffsetofExpr *offsetofExpr ) {
406 acceptAllNewScope( offsetofExpr->get_results(), *this );
407 maybeAccept( offsetofExpr->get_type(), *this );
408 }
409
410 void Indexer::visit( OffsetofExpr *offsetofExpr ) {
411 acceptAllNewScope( offsetofExpr->get_results(), *this );
412 maybeAccept( offsetofExpr->get_type(), *this );
413 maybeAccept( offsetofExpr->get_member(), *this );
414 }
415
416 void Indexer::visit( OffsetPackExpr *offsetPackExpr ) {
417 acceptAllNewScope( offsetPackExpr->get_results(), *this );
418 maybeAccept( offsetPackExpr->get_type(), *this );
419 }
420
421 void Indexer::visit( AttrExpr *attrExpr ) {
422 acceptAllNewScope( attrExpr->get_results(), *this );
423 if ( attrExpr->get_isType() ) {
424 maybeAccept( attrExpr->get_type(), *this );
425 } else {
426 maybeAccept( attrExpr->get_expr(), *this );
427 }
428 }
429
430 void Indexer::visit( LogicalExpr *logicalExpr ) {
431 acceptAllNewScope( logicalExpr->get_results(), *this );
432 maybeAccept( logicalExpr->get_arg1(), *this );
433 maybeAccept( logicalExpr->get_arg2(), *this );
434 }
435
436 void Indexer::visit( ConditionalExpr *conditionalExpr ) {
437 acceptAllNewScope( conditionalExpr->get_results(), *this );
438 maybeAccept( conditionalExpr->get_arg1(), *this );
439 maybeAccept( conditionalExpr->get_arg2(), *this );
440 maybeAccept( conditionalExpr->get_arg3(), *this );
441 }
442
443 void Indexer::visit( CommaExpr *commaExpr ) {
444 acceptAllNewScope( commaExpr->get_results(), *this );
445 maybeAccept( commaExpr->get_arg1(), *this );
446 maybeAccept( commaExpr->get_arg2(), *this );
447 }
448
449 void Indexer::visit( TupleExpr *tupleExpr ) {
450 acceptAllNewScope( tupleExpr->get_results(), *this );
451 acceptAll( tupleExpr->get_exprs(), *this );
452 }
453
454 void Indexer::visit( SolvedTupleExpr *tupleExpr ) {
455 acceptAllNewScope( tupleExpr->get_results(), *this );
456 acceptAll( tupleExpr->get_exprs(), *this );
457 }
458
459 void Indexer::visit( TypeExpr *typeExpr ) {
460 acceptAllNewScope( typeExpr->get_results(), *this );
461 maybeAccept( typeExpr->get_type(), *this );
462 }
463
464 void Indexer::visit( AsmExpr *asmExpr ) {
465 maybeAccept( asmExpr->get_inout(), *this );
466 maybeAccept( asmExpr->get_constraint(), *this );
467 maybeAccept( asmExpr->get_operand(), *this );
468 }
469
470 void Indexer::visit( UntypedValofExpr *valofExpr ) {
471 acceptAllNewScope( valofExpr->get_results(), *this );
472 maybeAccept( valofExpr->get_body(), *this );
473 }
474
475
476 void Indexer::visit( TraitInstType *contextInst ) {
477 acceptAll( contextInst->get_parameters(), *this );
478 acceptAll( contextInst->get_members(), *this );
479 }
480
481 void Indexer::visit( StructInstType *structInst ) {
482 if ( ! lookupStruct( structInst->get_name() ) ) {
483 debugPrint( "Adding struct " << structInst->get_name() << " from implicit forward declaration" << std::endl );
484 addStruct( structInst->get_name() );
485 }
486 enterScope();
487 acceptAll( structInst->get_parameters(), *this );
488 leaveScope();
489 }
490
491 void Indexer::visit( UnionInstType *unionInst ) {
492 if ( ! lookupUnion( unionInst->get_name() ) ) {
493 debugPrint( "Adding union " << unionInst->get_name() << " from implicit forward declaration" << std::endl );
494 addUnion( unionInst->get_name() );
495 }
496 enterScope();
497 acceptAll( unionInst->get_parameters(), *this );
498 leaveScope();
499 }
500
501 void Indexer::visit( ForStmt *forStmt ) {
502 // for statements introduce a level of scope
503 enterScope();
504 Visitor::visit( forStmt );
505 leaveScope();
506 }
507
508
509
510 void Indexer::lookupId( const std::string &id, std::list< DeclarationWithType* > &out ) const {
511 std::unordered_set< std::string > foundMangleNames;
512
513 Indexer::Impl *searchTables = tables;
514 while ( searchTables ) {
515
516 IdTable::const_iterator decls = searchTables->idTable.find( id );
517 if ( decls != searchTables->idTable.end() ) {
518 const MangleTable &mangleTable = decls->second;
519 for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
520 // mark the mangled name as found, skipping this insertion if a declaration for that name has already been found
521 if ( foundMangleNames.insert( decl->first ).second == false ) continue;
522
523 out.push_back( decl->second );
524 }
525 }
526
527 // get declarations from base indexers
528 searchTables = searchTables->base.tables;
529 }
530
531 // some special functions, e.g. constructors and destructors
532 // remove autogenerated functions when they are defined so that
533 // they can never be matched
534 removeSpecialOverrides( id, out );
535 }
536
537 NamedTypeDecl *Indexer::lookupType( const std::string &id ) const {
538 if ( ! tables ) return 0;
539
540 TypeTable::const_iterator ret = tables->typeTable.find( id );
541 return ret != tables->typeTable.end() ? ret->second : tables->base.lookupType( id );
542 }
543
544 StructDecl *Indexer::lookupStruct( const std::string &id ) const {
545 if ( ! tables ) return 0;
546
547 StructTable::const_iterator ret = tables->structTable.find( id );
548 return ret != tables->structTable.end() ? ret->second : tables->base.lookupStruct( id );
549 }
550
551 EnumDecl *Indexer::lookupEnum( const std::string &id ) const {
552 if ( ! tables ) return 0;
553
554 EnumTable::const_iterator ret = tables->enumTable.find( id );
555 return ret != tables->enumTable.end() ? ret->second : tables->base.lookupEnum( id );
556 }
557
558 UnionDecl *Indexer::lookupUnion( const std::string &id ) const {
559 if ( ! tables ) return 0;
560
561 UnionTable::const_iterator ret = tables->unionTable.find( id );
562 return ret != tables->unionTable.end() ? ret->second : tables->base.lookupUnion( id );
563 }
564
565 TraitDecl *Indexer::lookupTrait( const std::string &id ) const {
566 if ( ! tables ) return 0;
567
568 TraitTable::const_iterator ret = tables->traitTable.find( id );
569 return ret != tables->traitTable.end() ? ret->second : tables->base.lookupTrait( id );
570 }
571
572 DeclarationWithType *Indexer::lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
573 if ( ! tables ) return 0;
574 if ( tables->scope < scope ) return 0;
575
576 IdTable::const_iterator decls = tables->idTable.find( id );
577 if ( decls != tables->idTable.end() ) {
578 const MangleTable &mangleTable = decls->second;
579 MangleTable::const_iterator decl = mangleTable.find( mangleName );
580 if ( decl != mangleTable.end() ) return decl->second;
581 }
582
583 return tables->base.lookupIdAtScope( id, mangleName, scope );
584 }
585
586 bool Indexer::hasIncompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
587 if ( ! tables ) return false;
588 if ( tables->scope < scope ) return false;
589
590 IdTable::const_iterator decls = tables->idTable.find( id );
591 if ( decls != tables->idTable.end() ) {
592 const MangleTable &mangleTable = decls->second;
593 for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
594 // check for C decls with the same name, skipping those with a compatible type (by mangleName)
595 if ( decl->second->get_linkage() == LinkageSpec::C && decl->first != mangleName ) return true;
596 }
597 }
598
599 return tables->base.hasIncompatibleCDecl( id, mangleName, scope );
600 }
601
602 bool Indexer::hasCompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
603 if ( ! tables ) return false;
604 if ( tables->scope < scope ) return false;
605
606 IdTable::const_iterator decls = tables->idTable.find( id );
607 if ( decls != tables->idTable.end() ) {
608 const MangleTable &mangleTable = decls->second;
609 for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
610 // check for C decls with the same name, skipping
611 // those with an incompatible type (by mangleName)
612 if ( decl->second->get_linkage() == LinkageSpec::C && decl->first == mangleName ) return true;
613 }
614 }
615
616 return tables->base.hasCompatibleCDecl( id, mangleName, scope );
617 }
618
619 NamedTypeDecl *Indexer::lookupTypeAtScope( const std::string &id, unsigned long scope ) const {
620 if ( ! tables ) return 0;
621 if ( tables->scope < scope ) return 0;
622
623 TypeTable::const_iterator ret = tables->typeTable.find( id );
624 return ret != tables->typeTable.end() ? ret->second : tables->base.lookupTypeAtScope( id, scope );
625 }
626
627 StructDecl *Indexer::lookupStructAtScope( const std::string &id, unsigned long scope ) const {
628 if ( ! tables ) return 0;
629 if ( tables->scope < scope ) return 0;
630
631 StructTable::const_iterator ret = tables->structTable.find( id );
632 return ret != tables->structTable.end() ? ret->second : tables->base.lookupStructAtScope( id, scope );
633 }
634
635 EnumDecl *Indexer::lookupEnumAtScope( const std::string &id, unsigned long scope ) const {
636 if ( ! tables ) return 0;
637 if ( tables->scope < scope ) return 0;
638
639 EnumTable::const_iterator ret = tables->enumTable.find( id );
640 return ret != tables->enumTable.end() ? ret->second : tables->base.lookupEnumAtScope( id, scope );
641 }
642
643 UnionDecl *Indexer::lookupUnionAtScope( const std::string &id, unsigned long scope ) const {
644 if ( ! tables ) return 0;
645 if ( tables->scope < scope ) return 0;
646
647 UnionTable::const_iterator ret = tables->unionTable.find( id );
648 return ret != tables->unionTable.end() ? ret->second : tables->base.lookupUnionAtScope( id, scope );
649 }
650
651 TraitDecl *Indexer::lookupTraitAtScope( const std::string &id, unsigned long scope ) const {
652 if ( ! tables ) return 0;
653 if ( tables->scope < scope ) return 0;
654
655 TraitTable::const_iterator ret = tables->traitTable.find( id );
656 return ret != tables->traitTable.end() ? ret->second : tables->base.lookupTraitAtScope( id, scope );
657 }
658
659 bool addedIdConflicts( DeclarationWithType *existing, DeclarationWithType *added ) {
660 // if we're giving the same name mangling to things of different types then there is something wrong
661 assert( (dynamic_cast<ObjectDecl*>( added ) && dynamic_cast<ObjectDecl*>( existing ) )
662 || (dynamic_cast<FunctionDecl*>( added ) && dynamic_cast<FunctionDecl*>( existing ) ) );
663
664 if ( LinkageSpec::isOverridable( existing->get_linkage() ) ) {
665 // new definition shadows the autogenerated one, even at the same scope
666 return false;
667 } else if ( added->get_linkage() != LinkageSpec::C || ResolvExpr::typesCompatible( added->get_type(), existing->get_type(), Indexer() ) ) {
668 // typesCompatible doesn't really do the right thing here. When checking compatibility of function types,
669 // we should ignore outermost pointer qualifiers, except _Atomic?
670 FunctionDecl *newentry = dynamic_cast< FunctionDecl* >( added );
671 FunctionDecl *oldentry = dynamic_cast< FunctionDecl* >( existing );
672 if ( newentry && oldentry ) {
673 if ( newentry->get_statements() && oldentry->get_statements() ) {
674 throw SemanticError( "duplicate function definition for ", added );
675 } // if
676 } else {
677 // two objects with the same mangled name defined in the same scope.
678 // both objects must be marked extern or both must be intrinsic for this to be okay
679 // xxx - perhaps it's actually if either is intrinsic then this is okay?
680 // might also need to be same storage class?
681 ObjectDecl *newobj = dynamic_cast< ObjectDecl* >( added );
682 ObjectDecl *oldobj = dynamic_cast< ObjectDecl* >( existing );
683 if ( newobj->get_storageClass() != DeclarationNode::Extern && oldobj->get_storageClass() != DeclarationNode::Extern ) {
684 throw SemanticError( "duplicate object definition for ", added );
685 } // if
686 } // if
687 } else {
688 throw SemanticError( "duplicate definition for ", added );
689 } // if
690
691 return true;
692 }
693
694 void Indexer::addId( DeclarationWithType *decl ) {
695 makeWritable();
696
697 const std::string &name = decl->get_name();
698 std::string mangleName;
699 if ( LinkageSpec::isOverridable( decl->get_linkage() ) ) {
700 // mangle the name without including the appropriate suffix, so overridable routines are placed into the
701 // same "bucket" as their user defined versions.
702 mangleName = Mangler::mangle( decl, false );
703 } else {
704 mangleName = Mangler::mangle( decl );
705 } // if
706
707 // this ensures that no two declarations with the same unmangled name at the same scope both have C linkage
708 if ( decl->get_linkage() == LinkageSpec::C ) {
709 // NOTE this is broken in Richard's original code in such a way that it never triggers (it
710 // doesn't check decls that have the same manglename, and all C-linkage decls are defined to
711 // have their name as their manglename, hence the error can never trigger).
712 // The code here is closer to correct, but name mangling would have to be completely
713 // isomorphic to C type-compatibility, which it may not be.
714 if ( hasIncompatibleCDecl( name, mangleName, scope ) ) {
715 throw SemanticError( "conflicting overload of C function ", decl );
716 }
717 } else {
718 // Check that a Cforall declaration doesn't overload any C declaration
719 if ( hasCompatibleCDecl( name, mangleName, scope ) ) {
720 throw SemanticError( "Cforall declaration hides C function ", decl );
721 }
722 }
723
724 // Skip repeat declarations of the same identifier
725 DeclarationWithType *existing = lookupIdAtScope( name, mangleName, scope );
726 if ( existing && addedIdConflicts( existing, decl ) ) return;
727
728 // add to indexer
729 tables->idTable[ name ][ mangleName ] = decl;
730 ++tables->size;
731 }
732
733 bool addedTypeConflicts( NamedTypeDecl *existing, NamedTypeDecl *added ) {
734 if ( existing->get_base() == 0 ) {
735 return false;
736 } else if ( added->get_base() == 0 ) {
737 return true;
738 } else {
739 throw SemanticError( "redeclaration of ", added );
740 }
741 }
742
743 void Indexer::addType( NamedTypeDecl *decl ) {
744 makeWritable();
745
746 const std::string &id = decl->get_name();
747 TypeTable::iterator existing = tables->typeTable.find( id );
748 if ( existing == tables->typeTable.end() ) {
749 NamedTypeDecl *parent = tables->base.lookupTypeAtScope( id, scope );
750 if ( ! parent || ! addedTypeConflicts( parent, decl ) ) {
751 tables->typeTable.insert( existing, std::make_pair( id, decl ) );
752 ++tables->size;
753 }
754 } else {
755 if ( ! addedTypeConflicts( existing->second, decl ) ) {
756 existing->second = decl;
757 }
758 }
759 }
760
761 bool addedDeclConflicts( AggregateDecl *existing, AggregateDecl *added ) {
762 if ( existing->get_members().empty() ) {
763 return false;
764 } else if ( ! added->get_members().empty() ) {
765 throw SemanticError( "redeclaration of ", added );
766 } // if
767 return true;
768 }
769
770 void Indexer::addStruct( const std::string &id ) {
771 addStruct( new StructDecl( id ) );
772 }
773
774 void Indexer::addStruct( StructDecl *decl ) {
775 makeWritable();
776
777 const std::string &id = decl->get_name();
778 StructTable::iterator existing = tables->structTable.find( id );
779 if ( existing == tables->structTable.end() ) {
780 StructDecl *parent = tables->base.lookupStructAtScope( id, scope );
781 if ( ! parent || ! addedDeclConflicts( parent, decl ) ) {
782 tables->structTable.insert( existing, std::make_pair( id, decl ) );
783 ++tables->size;
784 }
785 } else {
786 if ( ! addedDeclConflicts( existing->second, decl ) ) {
787 existing->second = decl;
788 }
789 }
790 }
791
792 void Indexer::addEnum( EnumDecl *decl ) {
793 makeWritable();
794
795 const std::string &id = decl->get_name();
796 EnumTable::iterator existing = tables->enumTable.find( id );
797 if ( existing == tables->enumTable.end() ) {
798 EnumDecl *parent = tables->base.lookupEnumAtScope( id, scope );
799 if ( ! parent || ! addedDeclConflicts( parent, decl ) ) {
800 tables->enumTable.insert( existing, std::make_pair( id, decl ) );
801 ++tables->size;
802 }
803 } else {
804 if ( ! addedDeclConflicts( existing->second, decl ) ) {
805 existing->second = decl;
806 }
807 }
808 }
809
810 void Indexer::addUnion( const std::string &id ) {
811 addUnion( new UnionDecl( id ) );
812 }
813
814 void Indexer::addUnion( UnionDecl *decl ) {
815 makeWritable();
816
817 const std::string &id = decl->get_name();
818 UnionTable::iterator existing = tables->unionTable.find( id );
819 if ( existing == tables->unionTable.end() ) {
820 UnionDecl *parent = tables->base.lookupUnionAtScope( id, scope );
821 if ( ! parent || ! addedDeclConflicts( parent, decl ) ) {
822 tables->unionTable.insert( existing, std::make_pair( id, decl ) );
823 ++tables->size;
824 }
825 } else {
826 if ( ! addedDeclConflicts( existing->second, decl ) ) {
827 existing->second = decl;
828 }
829 }
830 }
831
832 void Indexer::addTrait( TraitDecl *decl ) {
833 makeWritable();
834
835 const std::string &id = decl->get_name();
836 TraitTable::iterator existing = tables->traitTable.find( id );
837 if ( existing == tables->traitTable.end() ) {
838 TraitDecl *parent = tables->base.lookupTraitAtScope( id, scope );
839 if ( ! parent || ! addedDeclConflicts( parent, decl ) ) {
840 tables->traitTable.insert( existing, std::make_pair( id, decl ) );
841 ++tables->size;
842 }
843 } else {
844 if ( ! addedDeclConflicts( existing->second, decl ) ) {
845 existing->second = decl;
846 }
847 }
848 }
849
850 void Indexer::enterScope() {
851 ++scope;
852
853 if ( doDebug ) {
854 std::cout << "--- Entering scope " << scope << std::endl;
855 }
856 }
857
858 void Indexer::leaveScope() {
859 using std::cout;
860
861 assert( scope > 0 && "cannot leave initial scope" );
862 --scope;
863
864 while ( tables && tables->scope > scope ) {
865 if ( doDebug ) {
866 cout << "--- Leaving scope " << tables->scope << " containing" << std::endl;
867 dump( tables->idTable, cout );
868 dump( tables->typeTable, cout );
869 dump( tables->structTable, cout );
870 dump( tables->enumTable, cout );
871 dump( tables->unionTable, cout );
872 dump( tables->traitTable, cout );
873 }
874
875 // swap tables for base table until we find one at an appropriate scope
876 Indexer::Impl *base = newRef( tables->base.tables );
877 deleteRef( tables );
878 tables = base;
879 }
880 }
881
882 void Indexer::print( std::ostream &os, int indent ) const {
883 using std::cerr;
884
885 if ( tables ) {
886 os << "--- scope " << tables->scope << " ---" << std::endl;
887
888 os << "===idTable===" << std::endl;
889 dump( tables->idTable, os );
890 os << "===typeTable===" << std::endl;
891 dump( tables->typeTable, os );
892 os << "===structTable===" << std::endl;
893 dump( tables->structTable, os );
894 os << "===enumTable===" << std::endl;
895 dump( tables->enumTable, os );
896 os << "===unionTable===" << std::endl;
897 dump( tables->unionTable, os );
898 os << "===contextTable===" << std::endl;
899 dump( tables->traitTable, os );
900
901 tables->base.print( os, indent );
902 } else {
903 os << "--- end ---" << std::endl;
904 }
905
906 }
907} // namespace SymTab
908
909// Local Variables: //
910// tab-width: 4 //
911// mode: c++ //
912// compile-command: "make install" //
913// End: //
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