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source: src/SymTab/Indexer.cc @ 6a8df56

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since 6a8df56 was a181494, checked in by Rob Schluntz <rschlunt@…>, 7 years ago
Adding cost for reference-to-rvalue conversions
Property mode set to `100644`
File size: 28.1 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 : Thu Aug 17 16:08:40 2017
13	// Update Count : 20
14	//
15
16	#include "Indexer.h"
17
18	#include <cassert> // for assert, strict_dynamic_cast
19	#include <iostream> // for operator<<, basic_ostream, ostream
20	#include <string> // for string, operator<<, operator!=
21	#include <unordered_map> // for operator!=, unordered_map<>::const...
22	#include <unordered_set> // for unordered_set
23	#include <utility> // for pair, make_pair, move
24
25	#include "CodeGen/OperatorTable.h" // for isCtorDtor, isCtorDtorAssign
26	#include "Common/SemanticError.h" // for SemanticError
27	#include "Common/utility.h" // for cloneAll
28	#include "InitTweak/InitTweak.h" // for isConstructor, isCopyFunction, isC...
29	#include "Mangler.h" // for Mangler
30	#include "Parser/LinkageSpec.h" // for isMangled, isOverridable, Spec
31	#include "ResolvExpr/typeops.h" // for typesCompatible
32	#include "SynTree/Constant.h" // for Constant
33	#include "SynTree/Declaration.h" // for DeclarationWithType, FunctionDecl
34	#include "SynTree/Expression.h" // for Expression, ImplicitCopyCtorExpr
35	#include "SynTree/Initializer.h" // for Initializer
36	#include "SynTree/Statement.h" // for CompoundStmt, Statement, ForStmt (...
37	#include "SynTree/Type.h" // for Type, StructInstType, UnionInstType
38
39	#define debugPrint(x) if ( doDebug ) { std::cerr << x; }
40
41	namespace SymTab {
42	std::ostream & operator<<( std::ostream & out, const Indexer::IdData & data ) {
43	return out << "(" << data.id << "," << data.baseExpr << ")";
44	}
45
46	typedef std::unordered_map< std::string, Indexer::IdData > MangleTable;
47	typedef std::unordered_map< std::string, MangleTable > IdTable;
48	typedef std::unordered_map< std::string, NamedTypeDecl* > TypeTable;
49	typedef std::unordered_map< std::string, StructDecl* > StructTable;
50	typedef std::unordered_map< std::string, EnumDecl* > EnumTable;
51	typedef std::unordered_map< std::string, UnionDecl* > UnionTable;
52	typedef std::unordered_map< std::string, TraitDecl* > TraitTable;
53
54	void dump( const IdTable &table, std::ostream &os ) {
55	for ( IdTable::const_iterator id = table.begin(); id != table.end(); ++id ) {
56	for ( MangleTable::const_iterator mangle = id->second.begin(); mangle != id->second.end(); ++mangle ) {
57	os << mangle->second << std::endl;
58	}
59	}
60	}
61
62	template< typename Decl >
63	void dump( const std::unordered_map< std::string, Decl* > &table, std::ostream &os ) {
64	for ( typename std::unordered_map< std::string, Decl* >::const_iterator it = table.begin(); it != table.end(); ++it ) {
65	os << it->second << std::endl;
66	} // for
67	}
68
69	struct Indexer::Impl {
70	Impl( unsigned long _scope ) : refCount(1), scope( _scope ), size( 0 ), base(),
71	idTable(), typeTable(), structTable(), enumTable(), unionTable(), traitTable() {}
72	Impl( unsigned long _scope, Indexer &&_base ) : refCount(1), scope( _scope ), size( 0 ), base( _base ),
73	idTable(), typeTable(), structTable(), enumTable(), unionTable(), traitTable() {}
74	unsigned long refCount; ///< Number of references to these tables
75	unsigned long scope; ///< Scope these tables are associated with
76	unsigned long size; ///< Number of elements stored in this table
77	const Indexer base; ///< Base indexer this extends
78
79	IdTable idTable; ///< Identifier namespace
80	TypeTable typeTable; ///< Type namespace
81	StructTable structTable; ///< Struct namespace
82	EnumTable enumTable; ///< Enum namespace
83	UnionTable unionTable; ///< Union namespace
84	TraitTable traitTable; ///< Trait namespace
85	};
86
87	Indexer::Impl Indexer::newRef( Indexer::Impl toClone ) {
88	if ( ! toClone ) return 0;
89
90	// shorten the search chain by skipping empty links
91	Indexer::Impl *ret = toClone->size == 0 ? toClone->base.tables : toClone;
92	if ( ret ) { ++ret->refCount; }
93
94	return ret;
95	}
96
97	void Indexer::deleteRef( Indexer::Impl *toFree ) {
98	if ( ! toFree ) return;
99
100	if ( --toFree->refCount == 0 ) delete toFree;
101	}
102
103	void Indexer::removeSpecialOverrides( const std::string &id, std::list< IdData > & out ) const {
104	// only need to perform this step for constructors, destructors, and assignment functions
105	if ( ! CodeGen::isCtorDtorAssign( id ) ) return;
106
107	// helpful data structure
108	struct ValueType {
109	struct DeclBall {
110	IdData decl;
111	bool isUserDefinedFunc; // properties for this particular decl
112	bool isDefaultCtor;
113	bool isDtor;
114	bool isCopyFunc;
115	};
116	// properties for this type
117	bool existsUserDefinedFunc = false; // any user-defined function found
118	bool existsUserDefinedCtor = false; // any user-defined constructor found
119	bool existsUserDefinedDtor = false; // any user-defined destructor found
120	bool existsUserDefinedCopyFunc = false; // user-defined copy ctor found
121	bool existsUserDefinedDefaultCtor = false; // user-defined default 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+=( IdData data ) {
127	DeclarationWithType * function = data.id;
128	bool isUserDefinedFunc = ! LinkageSpec::isOverridable( function->get_linkage() );
129	bool isDefaultCtor = InitTweak::isDefaultConstructor( function );
130	bool isDtor = InitTweak::isDestructor( function );
131	bool isCopyFunc = InitTweak::isCopyFunction( function, function->get_name() );
132	decls.push_back( DeclBall{ data, isUserDefinedFunc, isDefaultCtor, isDtor, isCopyFunc } );
133	existsUserDefinedFunc = existsUserDefinedFunc \|\| isUserDefinedFunc;
134	existsUserDefinedCtor = existsUserDefinedCtor \|\| (isUserDefinedFunc && CodeGen::isConstructor( function->get_name() ) );
135	existsUserDefinedDtor = existsUserDefinedDtor \|\| (isUserDefinedFunc && isDtor);
136	existsUserDefinedCopyFunc = existsUserDefinedCopyFunc \|\| (isUserDefinedFunc && isCopyFunc);
137	existsUserDefinedDefaultCtor = existsUserDefinedDefaultCtor \|\| (isUserDefinedFunc && isDefaultCtor);
138	return *this;
139	}
140	}; // ValueType
141
142	std::list< IdData > copy;
143	copy.splice( copy.end(), out );
144
145	// organize discovered declarations by type
146	std::unordered_map< std::string, ValueType > funcMap;
147	for ( auto decl : copy ) {
148	if ( FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl.id ) ) {
149	std::list< DeclarationWithType * > & params = function->get_functionType()->get_parameters();
150	assert( ! params.empty() );
151	// use base type of pointer, so that qualifiers on the pointer type aren't considered.
152	Type * base = InitTweak::getPointerBase( params.front()->get_type() );
153	assert( base );
154	funcMap[ Mangler::mangle( base ) ] += decl;
155	} else {
156	out.push_back( decl );
157	}
158	}
159
160	// if a type contains user defined ctor/dtor/assign, then special rules trigger, which determine
161	// the set of ctor/dtor/assign that are seen by the requester. In particular, if the user defines
162	// a default ctor, then the generated default ctor should never be seen, likewise for copy ctor
163	// and dtor. If the user defines any ctor/dtor, then no generated field ctors should be seen.
164	// If the user defines any ctor then the generated default ctor should not be seen (intrinsic default
165	// ctor must be overridden exactly).
166	for ( std::pair< const std::string, ValueType > & pair : funcMap ) {
167	ValueType & val = pair.second;
168	for ( ValueType::DeclBall ball : val.decls ) {
169	bool noUserDefinedFunc = ! val.existsUserDefinedFunc;
170	bool isUserDefinedFunc = ball.isUserDefinedFunc;
171	bool isAcceptableDefaultCtor = (! val.existsUserDefinedCtor \|\| (! val.existsUserDefinedDefaultCtor && ball.decl.id->get_linkage() == LinkageSpec::Intrinsic)) && ball.isDefaultCtor; // allow default constructors only when no user-defined constructors exist, except in the case of intrinsics, which require exact overrides
172	bool isAcceptableCopyFunc = ! val.existsUserDefinedCopyFunc && ball.isCopyFunc; // handles copy ctor and assignment operator
173	bool isAcceptableDtor = ! val.existsUserDefinedDtor && ball.isDtor;
174	if ( noUserDefinedFunc \|\| isUserDefinedFunc \|\| isAcceptableDefaultCtor \|\| isAcceptableCopyFunc \|\| isAcceptableDtor ) {
175	// decl conforms to the rules described above, so it should be seen by the requester
176	out.push_back( ball.decl );
177	}
178	}
179	}
180	}
181
182	void Indexer::makeWritable() {
183	if ( ! tables ) {
184	// create indexer if not yet set
185	tables = new Indexer::Impl( scope );
186	} else if ( tables->refCount > 1 \|\| tables->scope != scope ) {
187	// make this indexer the base of a fresh indexer at the current scope
188	tables = new Indexer::Impl( scope, std::move( *this ) );
189	}
190	}
191
192	Indexer::Indexer() : tables( 0 ), scope( 0 ) {}
193
194	Indexer::Indexer( const Indexer &that ) : doDebug( that.doDebug ), tables( newRef( that.tables ) ), scope( that.scope ) {}
195
196	Indexer::Indexer( Indexer &&that ) : doDebug( that.doDebug ), tables( that.tables ), scope( that.scope ) {
197	that.tables = 0;
198	}
199
200	Indexer::~Indexer() {
201	deleteRef( tables );
202	}
203
204	Indexer& Indexer::operator= ( const Indexer &that ) {
205	deleteRef( tables );
206
207	tables = newRef( that.tables );
208	scope = that.scope;
209	doDebug = that.doDebug;
210
211	return *this;
212	}
213
214	Indexer& Indexer::operator= ( Indexer &&that ) {
215	deleteRef( tables );
216
217	tables = that.tables;
218	scope = that.scope;
219	doDebug = that.doDebug;
220
221	that.tables = 0;
222
223	return *this;
224	}
225
226	void Indexer::lookupId( const std::string &id, std::list< IdData > &out ) const {
227	std::unordered_set< std::string > foundMangleNames;
228
229	Indexer::Impl *searchTables = tables;
230	while ( searchTables ) {
231
232	IdTable::const_iterator decls = searchTables->idTable.find( id );
233	if ( decls != searchTables->idTable.end() ) {
234	const MangleTable &mangleTable = decls->second;
235	for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
236	// mark the mangled name as found, skipping this insertion if a declaration for that name has already been found
237	if ( foundMangleNames.insert( decl->first ).second == false ) continue;
238
239	out.push_back( decl->second );
240	}
241	}
242
243	// get declarations from base indexers
244	searchTables = searchTables->base.tables;
245	}
246
247	// some special functions, e.g. constructors and destructors
248	// remove autogenerated functions when they are defined so that
249	// they can never be matched
250	removeSpecialOverrides( id, out );
251	}
252
253	NamedTypeDecl *Indexer::lookupType( const std::string &id ) const {
254	if ( ! tables ) return 0;
255
256	TypeTable::const_iterator ret = tables->typeTable.find( id );
257	return ret != tables->typeTable.end() ? ret->second : tables->base.lookupType( id );
258	}
259
260	StructDecl *Indexer::lookupStruct( const std::string &id ) const {
261	if ( ! tables ) return 0;
262
263	StructTable::const_iterator ret = tables->structTable.find( id );
264	return ret != tables->structTable.end() ? ret->second : tables->base.lookupStruct( id );
265	}
266
267	EnumDecl *Indexer::lookupEnum( const std::string &id ) const {
268	if ( ! tables ) return 0;
269
270	EnumTable::const_iterator ret = tables->enumTable.find( id );
271	return ret != tables->enumTable.end() ? ret->second : tables->base.lookupEnum( id );
272	}
273
274	UnionDecl *Indexer::lookupUnion( const std::string &id ) const {
275	if ( ! tables ) return 0;
276
277	UnionTable::const_iterator ret = tables->unionTable.find( id );
278	return ret != tables->unionTable.end() ? ret->second : tables->base.lookupUnion( id );
279	}
280
281	TraitDecl *Indexer::lookupTrait( const std::string &id ) const {
282	if ( ! tables ) return 0;
283
284	TraitTable::const_iterator ret = tables->traitTable.find( id );
285	return ret != tables->traitTable.end() ? ret->second : tables->base.lookupTrait( id );
286	}
287
288	const Indexer::IdData * Indexer::lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
289	if ( ! tables ) return nullptr;
290	if ( tables->scope < scope ) return nullptr;
291
292	IdTable::const_iterator decls = tables->idTable.find( id );
293	if ( decls != tables->idTable.end() ) {
294	const MangleTable &mangleTable = decls->second;
295	MangleTable::const_iterator decl = mangleTable.find( mangleName );
296	if ( decl != mangleTable.end() ) return &decl->second;
297	}
298
299	return tables->base.lookupIdAtScope( id, mangleName, scope );
300	}
301
302	Indexer::IdData * Indexer::lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope ) {
303	return const_cast<IdData >(const_cast<const Indexer >(this)->lookupIdAtScope( id, mangleName, scope ));
304	}
305
306	bool Indexer::hasIncompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
307	if ( ! tables ) return false;
308	if ( tables->scope < scope ) return false;
309
310	IdTable::const_iterator decls = tables->idTable.find( id );
311	if ( decls != tables->idTable.end() ) {
312	const MangleTable &mangleTable = decls->second;
313	for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
314	// check for C decls with the same name, skipping those with a compatible type (by mangleName)
315	if ( ! LinkageSpec::isMangled( decl->second.id->get_linkage() ) && decl->first != mangleName ) return true;
316	}
317	}
318
319	return tables->base.hasIncompatibleCDecl( id, mangleName, scope );
320	}
321
322	bool Indexer::hasCompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
323	if ( ! tables ) return false;
324	if ( tables->scope < scope ) return false;
325
326	IdTable::const_iterator decls = tables->idTable.find( id );
327	if ( decls != tables->idTable.end() ) {
328	const MangleTable &mangleTable = decls->second;
329	for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
330	// check for C decls with the same name, skipping
331	// those with an incompatible type (by mangleName)
332	if ( ! LinkageSpec::isMangled( decl->second.id->get_linkage() ) && decl->first == mangleName ) return true;
333	}
334	}
335
336	return tables->base.hasCompatibleCDecl( id, mangleName, scope );
337	}
338
339	NamedTypeDecl *Indexer::lookupTypeAtScope( const std::string &id, unsigned long scope ) const {
340	if ( ! tables ) return 0;
341	if ( tables->scope < scope ) return 0;
342
343	TypeTable::const_iterator ret = tables->typeTable.find( id );
344	return ret != tables->typeTable.end() ? ret->second : tables->base.lookupTypeAtScope( id, scope );
345	}
346
347	StructDecl *Indexer::lookupStructAtScope( const std::string &id, unsigned long scope ) const {
348	if ( ! tables ) return 0;
349	if ( tables->scope < scope ) return 0;
350
351	StructTable::const_iterator ret = tables->structTable.find( id );
352	return ret != tables->structTable.end() ? ret->second : tables->base.lookupStructAtScope( id, scope );
353	}
354
355	EnumDecl *Indexer::lookupEnumAtScope( const std::string &id, unsigned long scope ) const {
356	if ( ! tables ) return 0;
357	if ( tables->scope < scope ) return 0;
358
359	EnumTable::const_iterator ret = tables->enumTable.find( id );
360	return ret != tables->enumTable.end() ? ret->second : tables->base.lookupEnumAtScope( id, scope );
361	}
362
363	UnionDecl *Indexer::lookupUnionAtScope( const std::string &id, unsigned long scope ) const {
364	if ( ! tables ) return 0;
365	if ( tables->scope < scope ) return 0;
366
367	UnionTable::const_iterator ret = tables->unionTable.find( id );
368	return ret != tables->unionTable.end() ? ret->second : tables->base.lookupUnionAtScope( id, scope );
369	}
370
371	TraitDecl *Indexer::lookupTraitAtScope( const std::string &id, unsigned long scope ) const {
372	if ( ! tables ) return 0;
373	if ( tables->scope < scope ) return 0;
374
375	TraitTable::const_iterator ret = tables->traitTable.find( id );
376	return ret != tables->traitTable.end() ? ret->second : tables->base.lookupTraitAtScope( id, scope );
377	}
378
379	bool addedIdConflicts( Indexer::IdData & existing, DeclarationWithType added, BaseSyntaxNode deleteStmt, Indexer::ConflictFunction handleConflicts ) {
380	// if we're giving the same name mangling to things of different types then there is something wrong
381	assert( (dynamic_cast<ObjectDecl>( added ) && dynamic_cast<ObjectDecl>( existing.id ) )
382	\|\| (dynamic_cast<FunctionDecl>( added ) && dynamic_cast<FunctionDecl>( existing.id ) ) );
383
384	if ( LinkageSpec::isOverridable( existing.id->get_linkage() ) ) {
385	// new definition shadows the autogenerated one, even at the same scope
386	return false;
387	} else if ( LinkageSpec::isMangled( added->get_linkage() ) \|\| ResolvExpr::typesCompatible( added->get_type(), existing.id->get_type(), Indexer() ) ) {
388
389	// it is a conflict if one declaration is deleted and the other is not
390	if ( deleteStmt && ! existing.deleteStmt ) {
391	return handleConflicts( existing, "deletion of defined identifier " );
392	} else if ( ! deleteStmt && existing.deleteStmt ) {
393	return handleConflicts( existing, "definition of deleted identifier " );
394	}
395
396	// typesCompatible doesn't really do the right thing here. When checking compatibility of function types,
397	// we should ignore outermost pointer qualifiers, except _Atomic?
398	FunctionDecl * newentry = dynamic_cast< FunctionDecl * >( added );
399	FunctionDecl * oldentry = dynamic_cast< FunctionDecl * >( existing.id );
400	if ( newentry && oldentry ) {
401	if ( newentry->get_statements() && oldentry->get_statements() ) {
402	return handleConflicts( existing, "duplicate function definition for " );
403	} // if
404	} else {
405	// two objects with the same mangled name defined in the same scope.
406	// both objects must be marked extern or both must be intrinsic for this to be okay
407	// xxx - perhaps it's actually if either is intrinsic then this is okay?
408	// might also need to be same storage class?
409	ObjectDecl * newobj = dynamic_cast< ObjectDecl * >( added );
410	ObjectDecl * oldobj = dynamic_cast< ObjectDecl * >( existing.id );
411	if ( ! newobj->get_storageClasses().is_extern && ! oldobj->get_storageClasses().is_extern ) {
412	return handleConflicts( existing, "duplicate object definition for " );
413	} // if
414	} // if
415	} else {
416	return handleConflicts( existing, "duplicate definition for " );
417	} // if
418
419	return true;
420	}
421
422	void Indexer::addId( DeclarationWithType decl, ConflictFunction handleConflicts, Expression baseExpr, BaseSyntaxNode * deleteStmt ) {
423	if ( decl->name == "" ) return;
424	debugPrint( "Adding Id " << decl->name << std::endl );
425	makeWritable();
426
427	const std::string &name = decl->name;
428	std::string mangleName;
429	if ( LinkageSpec::isOverridable( decl->linkage ) ) {
430	// mangle the name without including the appropriate suffix, so overridable routines are placed into the
431	// same "bucket" as their user defined versions.
432	mangleName = Mangler::mangle( decl, false );
433	} else {
434	mangleName = Mangler::mangle( decl );
435	} // if
436
437	// this ensures that no two declarations with the same unmangled name at the same scope both have C linkage
438	if ( ! LinkageSpec::isMangled( decl->linkage ) ) {
439	// NOTE this is broken in Richard's original code in such a way that it never triggers (it
440	// doesn't check decls that have the same manglename, and all C-linkage decls are defined to
441	// have their name as their manglename, hence the error can never trigger).
442	// The code here is closer to correct, but name mangling would have to be completely
443	// isomorphic to C type-compatibility, which it may not be.
444	if ( hasIncompatibleCDecl( name, mangleName, scope ) ) {
445	throw SemanticError( decl, "conflicting overload of C function " );
446	}
447	} else {
448	// Check that a Cforall declaration doesn't override any C declaration
449	if ( hasCompatibleCDecl( name, mangleName, scope ) ) {
450	throw SemanticError( decl, "Cforall declaration hides C function " );
451	}
452	}
453
454	// Skip repeat declarations of the same identifier
455	IdData * existing = lookupIdAtScope( name, mangleName, scope );
456	if ( existing && existing->id && addedIdConflicts( *existing, decl, deleteStmt, handleConflicts ) ) return;
457
458	// add to indexer
459	tables->idTable[ name ][ mangleName ] = IdData{ decl, baseExpr, deleteStmt };
460	++tables->size;
461	}
462
463	void Indexer::addId( DeclarationWithType * decl, Expression * baseExpr ) {
464	// default handling of conflicts is to raise an error
465	addId( decl, [decl](IdData &, const std::string & msg) { throw SemanticError( decl, msg ); return true; }, baseExpr );
466	}
467
468	void Indexer::addDeletedId( DeclarationWithType * decl, BaseSyntaxNode * deleteStmt ) {
469	// default handling of conflicts is to raise an error
470	addId( decl, [decl](IdData &, const std::string & msg) { throw SemanticError( decl, msg ); return true; }, nullptr, deleteStmt );
471	}
472
473	bool addedTypeConflicts( NamedTypeDecl existing, NamedTypeDecl added ) {
474	if ( existing->get_base() == 0 ) {
475	return false;
476	} else if ( added->get_base() == 0 ) {
477	return true;
478	} else {
479	throw SemanticError( added, "redeclaration of " );
480	}
481	}
482
483	void Indexer::addType( NamedTypeDecl *decl ) {
484	debugPrint( "Adding type " << decl->name << std::endl );
485	makeWritable();
486
487	const std::string &id = decl->get_name();
488	TypeTable::iterator existing = tables->typeTable.find( id );
489	if ( existing == tables->typeTable.end() ) {
490	NamedTypeDecl *parent = tables->base.lookupTypeAtScope( id, scope );
491	if ( ! parent \|\| ! addedTypeConflicts( parent, decl ) ) {
492	tables->typeTable.insert( existing, std::make_pair( id, decl ) );
493	++tables->size;
494	}
495	} else {
496	if ( ! addedTypeConflicts( existing->second, decl ) ) {
497	existing->second = decl;
498	}
499	}
500	}
501
502	bool addedDeclConflicts( AggregateDecl existing, AggregateDecl added ) {
503	if ( existing->get_members().empty() ) {
504	return false;
505	} else if ( ! added->get_members().empty() ) {
506	throw SemanticError( added, "redeclaration of " );
507	} // if
508	return true;
509	}
510
511	void Indexer::addStruct( const std::string &id ) {
512	debugPrint( "Adding fwd decl for struct " << id << std::endl );
513	addStruct( new StructDecl( id ) );
514	}
515
516	void Indexer::addStruct( StructDecl *decl ) {
517	debugPrint( "Adding struct " << decl->name << std::endl );
518	makeWritable();
519
520	const std::string &id = decl->get_name();
521	StructTable::iterator existing = tables->structTable.find( id );
522	if ( existing == tables->structTable.end() ) {
523	StructDecl *parent = tables->base.lookupStructAtScope( id, scope );
524	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
525	tables->structTable.insert( existing, std::make_pair( id, decl ) );
526	++tables->size;
527	}
528	} else {
529	if ( ! addedDeclConflicts( existing->second, decl ) ) {
530	existing->second = decl;
531	}
532	}
533	}
534
535	void Indexer::addEnum( EnumDecl *decl ) {
536	debugPrint( "Adding enum " << decl->name << std::endl );
537	makeWritable();
538
539	const std::string &id = decl->get_name();
540	EnumTable::iterator existing = tables->enumTable.find( id );
541	if ( existing == tables->enumTable.end() ) {
542	EnumDecl *parent = tables->base.lookupEnumAtScope( id, scope );
543	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
544	tables->enumTable.insert( existing, std::make_pair( id, decl ) );
545	++tables->size;
546	}
547	} else {
548	if ( ! addedDeclConflicts( existing->second, decl ) ) {
549	existing->second = decl;
550	}
551	}
552	}
553
554	void Indexer::addUnion( const std::string &id ) {
555	debugPrint( "Adding fwd decl for union " << id << std::endl );
556	addUnion( new UnionDecl( id ) );
557	}
558
559	void Indexer::addUnion( UnionDecl *decl ) {
560	debugPrint( "Adding union " << decl->name << std::endl );
561	makeWritable();
562
563	const std::string &id = decl->get_name();
564	UnionTable::iterator existing = tables->unionTable.find( id );
565	if ( existing == tables->unionTable.end() ) {
566	UnionDecl *parent = tables->base.lookupUnionAtScope( id, scope );
567	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
568	tables->unionTable.insert( existing, std::make_pair( id, decl ) );
569	++tables->size;
570	}
571	} else {
572	if ( ! addedDeclConflicts( existing->second, decl ) ) {
573	existing->second = decl;
574	}
575	}
576	}
577
578	void Indexer::addTrait( TraitDecl *decl ) {
579	debugPrint( "Adding trait " << decl->name << std::endl );
580	makeWritable();
581
582	const std::string &id = decl->get_name();
583	TraitTable::iterator existing = tables->traitTable.find( id );
584	if ( existing == tables->traitTable.end() ) {
585	TraitDecl *parent = tables->base.lookupTraitAtScope( id, scope );
586	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
587	tables->traitTable.insert( existing, std::make_pair( id, decl ) );
588	++tables->size;
589	}
590	} else {
591	if ( ! addedDeclConflicts( existing->second, decl ) ) {
592	existing->second = decl;
593	}
594	}
595	}
596
597	void Indexer::addMembers( AggregateDecl * aggr, Expression * expr, ConflictFunction handleConflicts ) {
598	for ( Declaration * decl : aggr->members ) {
599	if ( DeclarationWithType * dwt = dynamic_cast< DeclarationWithType * >( decl ) ) {
600	addId( dwt, handleConflicts, expr );
601	if ( dwt->name == "" ) {
602	Type * t = dwt->get_type()->stripReferences();
603	if ( dynamic_cast< StructInstType * >( t ) \|\| dynamic_cast< UnionInstType * >( t ) ) {
604	Expression * base = expr->clone();
605	ResolvExpr::Cost cost = ResolvExpr::Cost::zero; // xxx - carry this cost into the indexer as a base cost?
606	ResolvExpr::referenceToRvalueConversion( base, cost );
607	addMembers( t->getAggr(), new MemberExpr( dwt, base ), handleConflicts );
608	}
609	}
610	}
611	}
612	}
613
614	void Indexer::addWith( std::list< Expression * > & withExprs, BaseSyntaxNode * withStmt ) {
615	for ( Expression * expr : withExprs ) {
616	if ( expr->result ) {
617	AggregateDecl * aggr = expr->result->stripReferences()->getAggr();
618	assertf( aggr, "WithStmt expr has non-aggregate type: %s", toString( expr->result ).c_str() );
619
620	addMembers( aggr, expr, [withStmt](IdData & existing, const std::string &) {
621	// on conflict, delete the identifier
622	existing.deleteStmt = withStmt;
623	return true;
624	});
625	}
626	}
627	}
628
629	void Indexer::addIds( const std::list< DeclarationWithType * > & decls ) {
630	for ( auto d : decls ) {
631	addId( d );
632	}
633	}
634
635	void Indexer::addTypes( const std::list< TypeDecl * > & tds ) {
636	for ( auto td : tds ) {
637	addType( td );
638	addIds( td->assertions );
639	}
640	}
641
642	void Indexer::addFunctionType( FunctionType * ftype ) {
643	addTypes( ftype->forall );
644	addIds( ftype->returnVals );
645	addIds( ftype->parameters );
646	}
647
648	void Indexer::enterScope() {
649	++scope;
650
651	if ( doDebug ) {
652	std::cerr << "--- Entering scope " << scope << std::endl;
653	}
654	}
655
656	void Indexer::leaveScope() {
657	using std::cerr;
658
659	assert( scope > 0 && "cannot leave initial scope" );
660	if ( doDebug ) {
661	cerr << "--- Leaving scope " << scope << " containing" << std::endl;
662	}
663	--scope;
664
665	while ( tables && tables->scope > scope ) {
666	if ( doDebug ) {
667	dump( tables->idTable, cerr );
668	dump( tables->typeTable, cerr );
669	dump( tables->structTable, cerr );
670	dump( tables->enumTable, cerr );
671	dump( tables->unionTable, cerr );
672	dump( tables->traitTable, cerr );
673	}
674
675	// swap tables for base table until we find one at an appropriate scope
676	Indexer::Impl *base = newRef( tables->base.tables );
677	deleteRef( tables );
678	tables = base;
679	}
680	}
681
682	void Indexer::print( std::ostream &os, int indent ) const {
683	using std::cerr;
684
685	if ( tables ) {
686	os << "--- scope " << tables->scope << " ---" << std::endl;
687
688	os << "===idTable===" << std::endl;
689	dump( tables->idTable, os );
690	os << "===typeTable===" << std::endl;
691	dump( tables->typeTable, os );
692	os << "===structTable===" << std::endl;
693	dump( tables->structTable, os );
694	os << "===enumTable===" << std::endl;
695	dump( tables->enumTable, os );
696	os << "===unionTable===" << std::endl;
697	dump( tables->unionTable, os );
698	os << "===contextTable===" << std::endl;
699	dump( tables->traitTable, os );
700
701	tables->base.print( os, indent );
702	} else {
703	os << "--- end ---" << std::endl;
704	}
705
706	}
707
708	Expression * Indexer::IdData::combine( ResolvExpr::Cost & cost ) const {
709	Expression * ret = nullptr;
710	if ( baseExpr ) {
711	Expression * base = baseExpr->clone();
712	ResolvExpr::referenceToRvalueConversion( base, cost );
713	ret = new MemberExpr( id, base );
714	// xxx - this introduces hidden environments, for now remove them.
715	// std::swap( base->env, ret->env );
716	delete base->env;
717	base->env = nullptr;
718	} else {
719	ret = new VariableExpr( id );
720	}
721	if ( deleteStmt ) ret = new DeletedExpr( ret, deleteStmt );
722	return ret;
723	}
724	} // namespace SymTab
725
726	// Local Variables: //
727	// tab-width: 4 //
728	// mode: c++ //
729	// compile-command: "make install" //
730	// End: //

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