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source: src/SymTab/Indexer.cc @ 2e041e27

ADTarm-ehast-experimentalcleanup-dtorsenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum

Last change on this file since 2e041e27 was 1cb7fab2, checked in by tdelisle <tdelisle@…>, 6 years ago
Added better support for enabling/disabling/compiling-out statistics
Property mode set to `100644`
File size: 30.7 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 "Common/Stats/Counter.h" // for counters
29	#include "GenPoly/GenPoly.h"
30	#include "InitTweak/InitTweak.h" // for isConstructor, isCopyFunction, isC...
31	#include "Mangler.h" // for Mangler
32	#include "Parser/LinkageSpec.h" // for isMangled, isOverridable, Spec
33	#include "ResolvExpr/typeops.h" // for typesCompatible
34	#include "SynTree/Constant.h" // for Constant
35	#include "SynTree/Declaration.h" // for DeclarationWithType, FunctionDecl
36	#include "SynTree/Expression.h" // for Expression, ImplicitCopyCtorExpr
37	#include "SynTree/Initializer.h" // for Initializer
38	#include "SynTree/Statement.h" // for CompoundStmt, Statement, ForStmt (...
39	#include "SynTree/Type.h" // for Type, StructInstType, UnionInstType
40
41	#define debugPrint(x) if ( doDebug ) { std::cerr << x; }
42
43	namespace SymTab {
44
45	// Statistics block
46	namespace {
47
48	static inline auto stats_idtable() {
49	using namespace Stats::Counters;
50	static auto group = build<CounterGroup>("IdTable");
51	static struct {
52	SimpleCounter * find;
53	AverageCounter<double> * size;
54	AverageCounter<double> * key;
55	} ret = {
56	.find = build<SimpleCounter>("Find calls", group),
57	.size = build<AverageCounter<double>>("Average Size", group),
58	.key = build<AverageCounter<double>>("Average Key Size", group),
59	};
60	return ret;
61	}
62
63	static inline auto stats_indexers() {
64	using namespace Stats::Counters;
65	static auto group = build<CounterGroup>("Indexers");
66	static struct {
67	SimpleCounter * count;
68	AverageCounter<double> * size;
69	AverageCounter<double> * depth_a;
70	MaxCounter<size_t> * depth_m;
71	} ret = {
72	.count = build<SimpleCounter>("Count", group),
73	.size = build<AverageCounter<double>>("Average Size", group),
74	.depth_a = build<AverageCounter<double>>("Average Depth", group),
75	.depth_m = build<MaxCounter<size_t>>("Max Depth", group),
76	};
77	return ret;
78	}
79	}
80
81	std::ostream & operator<<( std::ostream & out, const Indexer::IdData & data ) {
82	return out << "(" << data.id << "," << data.baseExpr << ")";
83	}
84
85	typedef std::unordered_map< std::string, Indexer::IdData > MangleTable;
86	typedef std::unordered_map< std::string, MangleTable > IdTable;
87	typedef std::unordered_map< std::string, NamedTypeDecl* > TypeTable;
88	typedef std::unordered_map< std::string, StructDecl* > StructTable;
89	typedef std::unordered_map< std::string, EnumDecl* > EnumTable;
90	typedef std::unordered_map< std::string, UnionDecl* > UnionTable;
91	typedef std::unordered_map< std::string, TraitDecl* > TraitTable;
92
93	void dump( const IdTable &table, std::ostream &os ) {
94	for ( IdTable::const_iterator id = table.begin(); id != table.end(); ++id ) {
95	for ( MangleTable::const_iterator mangle = id->second.begin(); mangle != id->second.end(); ++mangle ) {
96	os << mangle->second << std::endl;
97	}
98	}
99	}
100
101	template< typename Decl >
102	void dump( const std::unordered_map< std::string, Decl* > &table, std::ostream &os ) {
103	for ( typename std::unordered_map< std::string, Decl* >::const_iterator it = table.begin(); it != table.end(); ++it ) {
104	os << it->second << std::endl;
105	} // for
106	}
107
108	struct Indexer::Impl {
109	Impl( unsigned long _scope ) : refCount(1), scope( _scope ), size( 0 ), base(),
110	idTable(), typeTable(), structTable(), enumTable(), unionTable(), traitTable() {}
111	Impl( unsigned long _scope, Indexer &&_base ) : refCount(1), scope( _scope ), size( 0 ), base( _base ),
112	idTable(), typeTable(), structTable(), enumTable(), unionTable(), traitTable() {}
113	unsigned long refCount; ///< Number of references to these tables
114	unsigned long scope; ///< Scope these tables are associated with
115	unsigned long size; ///< Number of elements stored in this table
116	const Indexer base; ///< Base indexer this extends
117
118	IdTable idTable; ///< Identifier namespace
119	TypeTable typeTable; ///< Type namespace
120	StructTable structTable; ///< Struct namespace
121	EnumTable enumTable; ///< Enum namespace
122	UnionTable unionTable; ///< Union namespace
123	TraitTable traitTable; ///< Trait namespace
124	};
125
126	Indexer::Impl Indexer::newRef( Indexer::Impl toClone ) {
127	if ( ! toClone ) return 0;
128
129	// shorten the search chain by skipping empty links
130	Indexer::Impl *ret = toClone->size == 0 ? toClone->base.tables : toClone;
131	if ( ret ) { ++ret->refCount; }
132
133	return ret;
134	}
135
136	void Indexer::deleteRef( Indexer::Impl *toFree ) {
137	if ( ! toFree ) return;
138
139	if ( --toFree->refCount == 0 ) delete toFree;
140	}
141
142	void Indexer::removeSpecialOverrides( const std::string &id, std::list< IdData > & out ) const {
143	// only need to perform this step for constructors, destructors, and assignment functions
144	if ( ! CodeGen::isCtorDtorAssign( id ) ) return;
145
146	// helpful data structure to organize properties for a type
147	struct ValueType {
148	struct DeclBall { // properties for this particular decl
149	IdData decl;
150	bool isUserDefinedFunc;
151	bool isCopyFunc;
152	};
153	// properties for this type
154	bool existsUserDefinedCopyFunc = false; // user-defined copy ctor found
155	BaseSyntaxNode * deleteStmt = nullptr; // non-null if a user-defined function is found
156	std::list< DeclBall > decls;
157
158	// another FunctionDecl for the current type was found - determine
159	// if it has special properties and update data structure accordingly
160	ValueType & operator+=( IdData data ) {
161	DeclarationWithType * function = data.id;
162	bool isUserDefinedFunc = ! LinkageSpec::isOverridable( function->linkage );
163	bool isCopyFunc = InitTweak::isCopyFunction( function, function->name );
164	decls.push_back( DeclBall{ data, isUserDefinedFunc, isCopyFunc } );
165	existsUserDefinedCopyFunc = existsUserDefinedCopyFunc \|\| (isUserDefinedFunc && isCopyFunc);
166	if ( isUserDefinedFunc && ! deleteStmt ) {
167	// any user-defined function can act as an implicit delete statement for generated constructors.
168	// a delete stmt should not act as an implicit delete statement.
169	deleteStmt = data.id;
170	}
171	return *this;
172	}
173	}; // ValueType
174
175	std::list< IdData > copy;
176	copy.splice( copy.end(), out );
177
178	// organize discovered declarations by type
179	std::unordered_map< std::string, ValueType > funcMap;
180	for ( auto decl : copy ) {
181	if ( FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl.id ) ) {
182	std::list< DeclarationWithType * > & params = function->type->parameters;
183	assert( ! params.empty() );
184	// use base type of pointer, so that qualifiers on the pointer type aren't considered.
185	Type * base = InitTweak::getPointerBase( params.front()->get_type() );
186	assert( base );
187	funcMap[ Mangler::mangle( base ) ] += decl;
188	} else {
189	out.push_back( decl );
190	}
191	}
192
193	// if a type contains user defined ctor/dtor/assign, then special rules trigger, which determine
194	// the set of ctor/dtor/assign that can be used by the requester. In particular, if the user defines
195	// a default ctor, then the generated default ctor is unavailable, likewise for copy ctor
196	// and dtor. If the user defines any ctor/dtor, then no generated field ctors are available.
197	// If the user defines any ctor then the generated default ctor is unavailable (intrinsic default
198	// ctor must be overridden exactly). If the user defines anything that looks like a copy constructor,
199	// then the generated copy constructor is unavailable, and likewise for the assignment operator.
200	for ( std::pair< const std::string, ValueType > & pair : funcMap ) {
201	ValueType & val = pair.second;
202	for ( ValueType::DeclBall ball : val.decls ) {
203	bool isNotUserDefinedFunc = ! ball.isUserDefinedFunc && ball.decl.id->linkage != LinkageSpec::Intrinsic;
204	bool isCopyFunc = ball.isCopyFunc;
205	bool existsUserDefinedCopyFunc = val.existsUserDefinedCopyFunc;
206
207	// only implicitly delete non-user defined functions that are not intrinsic, and are
208	// not copy functions (assignment or copy constructor). If a user-defined copy function exists,
209	// do not pass along the non-user-defined copy functions since signatures do not have to match,
210	// and the generated functions will often be cheaper.
211	if ( isNotUserDefinedFunc ) {
212	if ( isCopyFunc ) {
213	// Skip over non-user-defined copy functions when there is a user-defined copy function.
214	// Since their signatures do not have to be exact, deleting them is the wrong choice.
215	if ( existsUserDefinedCopyFunc ) continue;
216	} else {
217	// delete non-user-defined non-copy functions if applicable.
218	// deleteStmt will be non-null only if a user-defined function is found.
219	ball.decl.deleteStmt = val.deleteStmt;
220	}
221	}
222	out.push_back( ball.decl );
223	}
224	}
225	}
226
227	void Indexer::makeWritable() {
228	if ( ! tables ) {
229	// create indexer if not yet set
230	tables = new Indexer::Impl( scope );
231	} else if ( tables->refCount > 1 \|\| tables->scope != scope ) {
232	// make this indexer the base of a fresh indexer at the current scope
233	tables = new Indexer::Impl( scope, std::move( *this ) );
234	}
235	}
236
237	Indexer::Indexer() : tables( 0 ), scope( 0 ) {
238	(*stats_indexers().count)++;
239	}
240
241	Indexer::Indexer( const Indexer &that ) : doDebug( that.doDebug ), tables( newRef( that.tables ) ), scope( that.scope ) {
242	(*stats_indexers().count)++;
243	}
244
245	Indexer::Indexer( Indexer &&that ) : doDebug( that.doDebug ), tables( that.tables ), scope( that.scope ) {
246	that.tables = 0;
247	}
248
249	Indexer::~Indexer() {
250	if(tables) {
251	stats_indexers().size->push( tables->idTable.size() );
252	size_t depth = 1;
253	for( auto crnt = tables->base.tables; crnt; crnt = crnt->base.tables ) {
254	++depth;
255	}
256	stats_indexers().depth_a->push( depth );
257	stats_indexers().depth_m->push( depth );
258	}
259	deleteRef( tables );
260	}
261
262	Indexer& Indexer::operator= ( const Indexer &that ) {
263	deleteRef( tables );
264
265	tables = newRef( that.tables );
266	scope = that.scope;
267	doDebug = that.doDebug;
268
269	return *this;
270	}
271
272	Indexer& Indexer::operator= ( Indexer &&that ) {
273	deleteRef( tables );
274
275	tables = that.tables;
276	scope = that.scope;
277	doDebug = that.doDebug;
278
279	that.tables = 0;
280
281	return *this;
282	}
283
284	void Indexer::lookupId( const std::string &id, std::list< IdData > &out ) const {
285	std::unordered_set< std::string > foundMangleNames;
286
287	Indexer::Impl *searchTables = tables;
288	while ( searchTables ) {
289
290	(*stats_idtable().find)++;
291	stats_idtable().key->push( id.size() );
292	stats_idtable().size->push( searchTables->idTable.size() );
293	IdTable::const_iterator decls = searchTables->idTable.find( id );
294	if ( decls != searchTables->idTable.end() ) {
295	const MangleTable &mangleTable = decls->second;
296	for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
297	// mark the mangled name as found, skipping this insertion if a declaration for that name has already been found
298	if ( foundMangleNames.insert( decl->first ).second == false ) continue;
299
300	out.push_back( decl->second );
301	}
302	}
303
304	// get declarations from base indexers
305	searchTables = searchTables->base.tables;
306	}
307
308	// some special functions, e.g. constructors and destructors
309	// remove autogenerated functions when they are defined so that
310	// they can never be matched
311	removeSpecialOverrides( id, out );
312	}
313
314	NamedTypeDecl *Indexer::lookupType( const std::string &id ) const {
315	if ( ! tables ) return 0;
316
317	TypeTable::const_iterator ret = tables->typeTable.find( id );
318	return ret != tables->typeTable.end() ? ret->second : tables->base.lookupType( id );
319	}
320
321	StructDecl *Indexer::lookupStruct( const std::string &id ) const {
322	if ( ! tables ) return 0;
323
324	StructTable::const_iterator ret = tables->structTable.find( id );
325	return ret != tables->structTable.end() ? ret->second : tables->base.lookupStruct( id );
326	}
327
328	NamedTypeDecl *Indexer::globalLookupType( const std::string &id ) const {
329	return lookupTypeAtScope( id, 0 );
330	}
331
332	StructDecl *Indexer::globalLookupStruct( const std::string &id ) const {
333	return lookupStructAtScope( id, 0 );
334	}
335
336	UnionDecl *Indexer::globalLookupUnion( const std::string &id ) const {
337	return lookupUnionAtScope( id, 0 );
338	}
339
340	EnumDecl *Indexer::globalLookupEnum( const std::string &id ) const {
341	return lookupEnumAtScope( id, 0 );
342	}
343
344	EnumDecl *Indexer::lookupEnum( const std::string &id ) const {
345	if ( ! tables ) return 0;
346
347	EnumTable::const_iterator ret = tables->enumTable.find( id );
348	return ret != tables->enumTable.end() ? ret->second : tables->base.lookupEnum( id );
349	}
350
351	UnionDecl *Indexer::lookupUnion( const std::string &id ) const {
352	if ( ! tables ) return 0;
353
354	UnionTable::const_iterator ret = tables->unionTable.find( id );
355	return ret != tables->unionTable.end() ? ret->second : tables->base.lookupUnion( id );
356	}
357
358	TraitDecl *Indexer::lookupTrait( const std::string &id ) const {
359	if ( ! tables ) return 0;
360
361	TraitTable::const_iterator ret = tables->traitTable.find( id );
362	return ret != tables->traitTable.end() ? ret->second : tables->base.lookupTrait( id );
363	}
364
365	const Indexer::IdData * Indexer::lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
366	if ( ! tables ) return nullptr;
367	if ( tables->scope < scope ) return nullptr;
368
369	(*stats_idtable().find)++;
370	stats_idtable().key->push( id.size() );
371	stats_idtable().size->push( tables->idTable.size() );
372	IdTable::const_iterator decls = tables->idTable.find( id );
373	if ( decls != tables->idTable.end() ) {
374	const MangleTable &mangleTable = decls->second;
375	MangleTable::const_iterator decl = mangleTable.find( mangleName );
376	if ( decl != mangleTable.end() ) return &decl->second;
377	}
378
379	return tables->base.lookupIdAtScope( id, mangleName, scope );
380	}
381
382	Indexer::IdData * Indexer::lookupIdAtScope( const std::string &id, const std::string &mangleName, unsigned long scope ) {
383	return const_cast<IdData >(const_cast<const Indexer >(this)->lookupIdAtScope( id, mangleName, scope ));
384	}
385
386	bool Indexer::hasIncompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
387	if ( ! tables ) return false;
388	if ( tables->scope < scope ) return false;
389
390	(*stats_idtable().find)++;
391	stats_idtable().key->push( id.size() );
392	stats_idtable().size->push( tables->idTable.size() );
393	IdTable::const_iterator decls = tables->idTable.find( id );
394	if ( decls != tables->idTable.end() ) {
395	const MangleTable &mangleTable = decls->second;
396	for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
397	// check for C decls with the same name, skipping those with a compatible type (by mangleName)
398	if ( ! LinkageSpec::isMangled( decl->second.id->get_linkage() ) && decl->first != mangleName ) return true;
399	}
400	}
401
402	return tables->base.hasIncompatibleCDecl( id, mangleName, scope );
403	}
404
405	bool Indexer::hasCompatibleCDecl( const std::string &id, const std::string &mangleName, unsigned long scope ) const {
406	if ( ! tables ) return false;
407	if ( tables->scope < scope ) return false;
408
409	(*stats_idtable().find)++;
410	stats_idtable().key->push( id.size() );
411	stats_idtable().size->push( tables->idTable.size() );
412	IdTable::const_iterator decls = tables->idTable.find( id );
413	if ( decls != tables->idTable.end() ) {
414	const MangleTable &mangleTable = decls->second;
415	for ( MangleTable::const_iterator decl = mangleTable.begin(); decl != mangleTable.end(); ++decl ) {
416	// check for C decls with the same name, skipping
417	// those with an incompatible type (by mangleName)
418	if ( ! LinkageSpec::isMangled( decl->second.id->get_linkage() ) && decl->first == mangleName ) return true;
419	}
420	}
421
422	return tables->base.hasCompatibleCDecl( id, mangleName, scope );
423	}
424
425	NamedTypeDecl *Indexer::lookupTypeAtScope( const std::string &id, unsigned long scope ) const {
426	if ( ! tables ) return 0;
427	if ( tables->scope < scope ) return 0;
428	if ( tables->scope > scope ) return tables->base.lookupTypeAtScope( id, scope );
429
430	TypeTable::const_iterator ret = tables->typeTable.find( id );
431	return ret != tables->typeTable.end() ? ret->second : tables->base.lookupTypeAtScope( id, scope );
432	}
433
434	StructDecl *Indexer::lookupStructAtScope( const std::string &id, unsigned long scope ) const {
435	if ( ! tables ) return 0;
436	if ( tables->scope < scope ) return 0;
437	if ( tables->scope > scope ) return tables->base.lookupStructAtScope( id, scope );
438
439	StructTable::const_iterator ret = tables->structTable.find( id );
440	return ret != tables->structTable.end() ? ret->second : tables->base.lookupStructAtScope( id, scope );
441	}
442
443	EnumDecl *Indexer::lookupEnumAtScope( const std::string &id, unsigned long scope ) const {
444	if ( ! tables ) return 0;
445	if ( tables->scope < scope ) return 0;
446	if ( tables->scope > scope ) return tables->base.lookupEnumAtScope( id, scope );
447
448	EnumTable::const_iterator ret = tables->enumTable.find( id );
449	return ret != tables->enumTable.end() ? ret->second : tables->base.lookupEnumAtScope( id, scope );
450	}
451
452	UnionDecl *Indexer::lookupUnionAtScope( const std::string &id, unsigned long scope ) const {
453	if ( ! tables ) return 0;
454	if ( tables->scope < scope ) return 0;
455	if ( tables->scope > scope ) return tables->base.lookupUnionAtScope( id, scope );
456
457	UnionTable::const_iterator ret = tables->unionTable.find( id );
458	return ret != tables->unionTable.end() ? ret->second : tables->base.lookupUnionAtScope( id, scope );
459	}
460
461	TraitDecl *Indexer::lookupTraitAtScope( const std::string &id, unsigned long scope ) const {
462	if ( ! tables ) return 0;
463	if ( tables->scope < scope ) return 0;
464	if ( tables->scope > scope ) return tables->base.lookupTraitAtScope( id, scope );
465
466	TraitTable::const_iterator ret = tables->traitTable.find( id );
467	return ret != tables->traitTable.end() ? ret->second : tables->base.lookupTraitAtScope( id, scope );
468	}
469
470	bool isFunction( DeclarationWithType * decl ) {
471	return GenPoly::getFunctionType( decl->get_type() );
472	}
473
474	bool isObject( DeclarationWithType * decl ) {
475	return ! isFunction( decl );
476	}
477
478	bool isDefinition( DeclarationWithType * decl ) {
479	if ( FunctionDecl * func = dynamic_cast< FunctionDecl * >( decl ) ) {
480	// a function is a definition if it has a body
481	return func->statements;
482	} else {
483	// an object is a definition if it is not marked extern.
484	// both objects must be marked extern
485	return ! decl->get_storageClasses().is_extern;
486	}
487	}
488
489	bool addedIdConflicts( Indexer::IdData & existing, DeclarationWithType added, BaseSyntaxNode deleteStmt, Indexer::ConflictFunction handleConflicts ) {
490	// if we're giving the same name mangling to things of different types then there is something wrong
491	assert( (isObject( added ) && isObject( existing.id ) )
492	\|\| ( isFunction( added ) && isFunction( existing.id ) ) );
493
494	if ( LinkageSpec::isOverridable( existing.id->get_linkage() ) ) {
495	// new definition shadows the autogenerated one, even at the same scope
496	return false;
497	} else if ( LinkageSpec::isMangled( added->get_linkage() ) \|\| ResolvExpr::typesCompatible( added->get_type(), existing.id->get_type(), Indexer() ) ) {
498
499	// it is a conflict if one declaration is deleted and the other is not
500	if ( deleteStmt && ! existing.deleteStmt ) {
501	return handleConflicts( existing, "deletion of defined identifier " );
502	} else if ( ! deleteStmt && existing.deleteStmt ) {
503	return handleConflicts( existing, "definition of deleted identifier " );
504	}
505
506	if ( isDefinition( added ) && isDefinition( existing.id ) ) {
507	if ( isFunction( added ) ) {
508	return handleConflicts( existing, "duplicate function definition for " );
509	} else {
510	return handleConflicts( existing, "duplicate object definition for " );
511	} // if
512	} // if
513	} else {
514	return handleConflicts( existing, "duplicate definition for " );
515	} // if
516
517	return true;
518	}
519
520	void Indexer::addId( DeclarationWithType decl, ConflictFunction handleConflicts, Expression baseExpr, BaseSyntaxNode * deleteStmt ) {
521	if ( decl->name == "" ) return;
522	debugPrint( "Adding Id " << decl->name << std::endl );
523	makeWritable();
524
525	const std::string &name = decl->name;
526	std::string mangleName;
527	if ( LinkageSpec::isOverridable( decl->linkage ) ) {
528	// mangle the name without including the appropriate suffix, so overridable routines are placed into the
529	// same "bucket" as their user defined versions.
530	mangleName = Mangler::mangle( decl, false );
531	} else {
532	mangleName = Mangler::mangle( decl );
533	} // if
534
535	// this ensures that no two declarations with the same unmangled name at the same scope both have C linkage
536	if ( ! LinkageSpec::isMangled( decl->linkage ) ) {
537	// NOTE this is broken in Richard's original code in such a way that it never triggers (it
538	// doesn't check decls that have the same manglename, and all C-linkage decls are defined to
539	// have their name as their manglename, hence the error can never trigger).
540	// The code here is closer to correct, but name mangling would have to be completely
541	// isomorphic to C type-compatibility, which it may not be.
542	if ( hasIncompatibleCDecl( name, mangleName, scope ) ) {
543	SemanticError( decl, "conflicting overload of C function " );
544	}
545	} else {
546	// Check that a Cforall declaration doesn't override any C declaration
547	if ( hasCompatibleCDecl( name, mangleName, scope ) ) {
548	SemanticError( decl, "Cforall declaration hides C function " );
549	}
550	}
551
552	// Skip repeat declarations of the same identifier
553	IdData * existing = lookupIdAtScope( name, mangleName, scope );
554	if ( existing && existing->id && addedIdConflicts( *existing, decl, deleteStmt, handleConflicts ) ) return;
555
556	// add to indexer
557	tables->idTable[ name ][ mangleName ] = IdData{ decl, baseExpr, deleteStmt };
558	++tables->size;
559	}
560
561	void Indexer::addId( DeclarationWithType * decl, Expression * baseExpr ) {
562	// default handling of conflicts is to raise an error
563	addId( decl, [decl](IdData &, const std::string & msg) { SemanticError( decl, msg ); return true; }, baseExpr, decl->isDeleted ? decl : nullptr );
564	}
565
566	void Indexer::addDeletedId( DeclarationWithType * decl, BaseSyntaxNode * deleteStmt ) {
567	// default handling of conflicts is to raise an error
568	addId( decl, [decl](IdData &, const std::string & msg) { SemanticError( decl, msg ); return true; }, nullptr, deleteStmt );
569	}
570
571	bool addedTypeConflicts( NamedTypeDecl existing, NamedTypeDecl added ) {
572	if ( existing->base == nullptr ) {
573	return false;
574	} else if ( added->base == nullptr ) {
575	return true;
576	} else {
577	assert( existing->base && added->base );
578	// typedef redeclarations are errors only if types are different
579	if ( ! ResolvExpr::typesCompatible( existing->base, added->base, Indexer() ) ) {
580	SemanticError( added->location, "redeclaration of " + added->name );
581	}
582	}
583	// does not need to be added to the table if both existing and added have a base that are the same
584	return true;
585	}
586
587	void Indexer::addType( NamedTypeDecl *decl ) {
588	debugPrint( "Adding type " << decl->name << std::endl );
589	makeWritable();
590
591	const std::string &id = decl->name;
592	TypeTable::iterator existing = tables->typeTable.find( id );
593	if ( existing == tables->typeTable.end() ) {
594	NamedTypeDecl *parent = tables->base.lookupTypeAtScope( id, scope );
595	if ( ! parent \|\| ! addedTypeConflicts( parent, decl ) ) {
596	tables->typeTable.insert( existing, std::make_pair( id, decl ) );
597	++tables->size;
598	}
599	} else {
600	if ( ! addedTypeConflicts( existing->second, decl ) ) {
601	existing->second = decl;
602	}
603	}
604	}
605
606	bool addedDeclConflicts( AggregateDecl existing, AggregateDecl added ) {
607	if ( ! existing->body ) {
608	return false;
609	} else if ( added->body ) {
610	SemanticError( added, "redeclaration of " );
611	} // if
612	return true;
613	}
614
615	void Indexer::addStruct( const std::string &id ) {
616	debugPrint( "Adding fwd decl for struct " << id << std::endl );
617	addStruct( new StructDecl( id ) );
618	}
619
620	void Indexer::addStruct( StructDecl *decl ) {
621	debugPrint( "Adding struct " << decl->name << std::endl );
622	makeWritable();
623
624	const std::string &id = decl->name;
625	StructTable::iterator existing = tables->structTable.find( id );
626	if ( existing == tables->structTable.end() ) {
627	StructDecl *parent = tables->base.lookupStructAtScope( id, scope );
628	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
629	tables->structTable.insert( existing, std::make_pair( id, decl ) );
630	++tables->size;
631	}
632	} else {
633	if ( ! addedDeclConflicts( existing->second, decl ) ) {
634	existing->second = decl;
635	}
636	}
637	}
638
639	void Indexer::addEnum( EnumDecl *decl ) {
640	debugPrint( "Adding enum " << decl->name << std::endl );
641	makeWritable();
642
643	const std::string &id = decl->name;
644	EnumTable::iterator existing = tables->enumTable.find( id );
645	if ( existing == tables->enumTable.end() ) {
646	EnumDecl *parent = tables->base.lookupEnumAtScope( id, scope );
647	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
648	tables->enumTable.insert( existing, std::make_pair( id, decl ) );
649	++tables->size;
650	}
651	} else {
652	if ( ! addedDeclConflicts( existing->second, decl ) ) {
653	existing->second = decl;
654	}
655	}
656	}
657
658	void Indexer::addUnion( const std::string &id ) {
659	debugPrint( "Adding fwd decl for union " << id << std::endl );
660	addUnion( new UnionDecl( id ) );
661	}
662
663	void Indexer::addUnion( UnionDecl *decl ) {
664	debugPrint( "Adding union " << decl->name << std::endl );
665	makeWritable();
666
667	const std::string &id = decl->name;
668	UnionTable::iterator existing = tables->unionTable.find( id );
669	if ( existing == tables->unionTable.end() ) {
670	UnionDecl *parent = tables->base.lookupUnionAtScope( id, scope );
671	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
672	tables->unionTable.insert( existing, std::make_pair( id, decl ) );
673	++tables->size;
674	}
675	} else {
676	if ( ! addedDeclConflicts( existing->second, decl ) ) {
677	existing->second = decl;
678	}
679	}
680	}
681
682	void Indexer::addTrait( TraitDecl *decl ) {
683	debugPrint( "Adding trait " << decl->name << std::endl );
684	makeWritable();
685
686	const std::string &id = decl->name;
687	TraitTable::iterator existing = tables->traitTable.find( id );
688	if ( existing == tables->traitTable.end() ) {
689	TraitDecl *parent = tables->base.lookupTraitAtScope( id, scope );
690	if ( ! parent \|\| ! addedDeclConflicts( parent, decl ) ) {
691	tables->traitTable.insert( existing, std::make_pair( id, decl ) );
692	++tables->size;
693	}
694	} else {
695	if ( ! addedDeclConflicts( existing->second, decl ) ) {
696	existing->second = decl;
697	}
698	}
699	}
700
701	void Indexer::addMembers( AggregateDecl * aggr, Expression * expr, ConflictFunction handleConflicts ) {
702	for ( Declaration * decl : aggr->members ) {
703	if ( DeclarationWithType * dwt = dynamic_cast< DeclarationWithType * >( decl ) ) {
704	addId( dwt, handleConflicts, expr );
705	if ( dwt->name == "" ) {
706	Type * t = dwt->get_type()->stripReferences();
707	if ( dynamic_cast< StructInstType * >( t ) \|\| dynamic_cast< UnionInstType * >( t ) ) {
708	Expression * base = expr->clone();
709	ResolvExpr::Cost cost = ResolvExpr::Cost::zero; // xxx - carry this cost into the indexer as a base cost?
710	ResolvExpr::referenceToRvalueConversion( base, cost );
711	addMembers( t->getAggr(), new MemberExpr( dwt, base ), handleConflicts );
712	}
713	}
714	}
715	}
716	}
717
718	void Indexer::addWith( std::list< Expression * > & withExprs, BaseSyntaxNode * withStmt ) {
719	for ( Expression * expr : withExprs ) {
720	if ( expr->result ) {
721	AggregateDecl * aggr = expr->result->stripReferences()->getAggr();
722	assertf( aggr, "WithStmt expr has non-aggregate type: %s", toString( expr->result ).c_str() );
723
724	addMembers( aggr, expr, [withStmt](IdData & existing, const std::string &) {
725	// on conflict, delete the identifier
726	existing.deleteStmt = withStmt;
727	return true;
728	});
729	}
730	}
731	}
732
733	void Indexer::addIds( const std::list< DeclarationWithType * > & decls ) {
734	for ( auto d : decls ) {
735	addId( d );
736	}
737	}
738
739	void Indexer::addTypes( const std::list< TypeDecl * > & tds ) {
740	for ( auto td : tds ) {
741	addType( td );
742	addIds( td->assertions );
743	}
744	}
745
746	void Indexer::addFunctionType( FunctionType * ftype ) {
747	addTypes( ftype->forall );
748	addIds( ftype->returnVals );
749	addIds( ftype->parameters );
750	}
751
752	void Indexer::enterScope() {
753	++scope;
754
755	if ( doDebug ) {
756	std::cerr << "--- Entering scope " << scope << std::endl;
757	}
758	}
759
760	void Indexer::leaveScope() {
761	using std::cerr;
762
763	assert( scope > 0 && "cannot leave initial scope" );
764	if ( doDebug ) {
765	cerr << "--- Leaving scope " << scope << " containing" << std::endl;
766	}
767	--scope;
768
769	while ( tables && tables->scope > scope ) {
770	if ( doDebug ) {
771	dump( tables->idTable, cerr );
772	dump( tables->typeTable, cerr );
773	dump( tables->structTable, cerr );
774	dump( tables->enumTable, cerr );
775	dump( tables->unionTable, cerr );
776	dump( tables->traitTable, cerr );
777	}
778
779	// swap tables for base table until we find one at an appropriate scope
780	Indexer::Impl *base = newRef( tables->base.tables );
781	deleteRef( tables );
782	tables = base;
783	}
784	}
785
786	void Indexer::print( std::ostream &os, int indent ) const {
787	using std::cerr;
788
789	if ( tables ) {
790	os << "--- scope " << tables->scope << " ---" << std::endl;
791
792	os << "===idTable===" << std::endl;
793	dump( tables->idTable, os );
794	os << "===typeTable===" << std::endl;
795	dump( tables->typeTable, os );
796	os << "===structTable===" << std::endl;
797	dump( tables->structTable, os );
798	os << "===enumTable===" << std::endl;
799	dump( tables->enumTable, os );
800	os << "===unionTable===" << std::endl;
801	dump( tables->unionTable, os );
802	os << "===contextTable===" << std::endl;
803	dump( tables->traitTable, os );
804
805	tables->base.print( os, indent );
806	} else {
807	os << "--- end ---" << std::endl;
808	}
809
810	}
811
812	Expression * Indexer::IdData::combine( ResolvExpr::Cost & cost ) const {
813	Expression * ret = nullptr;
814	if ( baseExpr ) {
815	Expression * base = baseExpr->clone();
816	ResolvExpr::referenceToRvalueConversion( base, cost );
817	ret = new MemberExpr( id, base );
818	// xxx - this introduces hidden environments, for now remove them.
819	// std::swap( base->env, ret->env );
820	delete base->env;
821	base->env = nullptr;
822	} else {
823	ret = new VariableExpr( id );
824	}
825	if ( deleteStmt ) ret = new DeletedExpr( ret, deleteStmt );
826	return ret;
827	}
828	} // namespace SymTab
829
830	// Local Variables: //
831	// tab-width: 4 //
832	// mode: c++ //
833	// compile-command: "make install" //
834	// End: //

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