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source: src/ResolvExpr/CurrentObject.cc @ a5294af

ast-experimental

Last change on this file since a5294af was 699a97d, checked in by Andrew Beach <ajbeach@…>, 15 months ago
Added IndexIterator?, which absorbs some functionality of some MemberIterator? types for CurrentObject?.
Property mode set to `100644`
File size: 39.7 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	// CurrentObject.h --
8	//
9	// Author : Rob Schluntz
10	// Created On : Tue Jun 13 15:28:32 2017
11	// Last Modified By : Andrew Beach
12	// Last Modified On : Mon Apr 10 9:40:00 2023
13	// Update Count : 18
14	//
15
16	#include <stddef.h> // for size_t
17	#include <cassert> // for assertf, assert, safe_dynamic_...
18	#include <deque>
19	#include <iostream> // for ostream, operator<<, basic_ost...
20	#include <stack> // for stack
21	#include <string> // for string, operator<<, allocator
22
23	#include "AST/Copy.hpp" // for shallowCopy
24	#include "AST/Expr.hpp" // for InitAlternative
25	#include "AST/GenericSubstitution.hpp" // for genericSubstitution
26	#include "AST/Init.hpp" // for Designation
27	#include "AST/Node.hpp" // for readonly
28	#include "AST/Print.hpp" // for readonly
29	#include "AST/Type.hpp"
30	#include "Common/Eval.h" // for eval
31	#include "Common/Indenter.h" // for Indenter, operator<<
32	#include "Common/SemanticError.h" // for SemanticError
33	#include "Common/utility.h" // for toString
34	#include "CurrentObject.h"
35	#include "SynTree/Constant.h" // for Constant
36	#include "SynTree/Declaration.h" // for ObjectDecl, Declaration, Struc...
37	#include "SynTree/Expression.h" // for InitAlternative, VariableExpr
38	#include "SynTree/Initializer.h" // for Designation, operator<<
39	#include "SynTree/Type.h" // for Type, StructInstType, UnionIns...
40	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
41
42	#if 0
43	#define PRINT(x) x
44	#else
45	#define PRINT(x)
46	#endif
47
48	namespace ResolvExpr {
49	template< typename AggrInst >
50	TypeSubstitution makeGenericSubstitution( AggrInst * inst ) {
51	assert( inst );
52	assert( inst->get_baseParameters() );
53	std::list< TypeDecl * > baseParams = *inst->get_baseParameters();
54	std::list< Expression * > typeSubs = inst->get_parameters();
55	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
56	return subs;
57	}
58
59	TypeSubstitution makeGenericSubstitution( Type * type ) {
60	if ( StructInstType * inst = dynamic_cast< StructInstType * >( type ) ) {
61	return makeGenericSubstitution( inst );
62	} else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( type ) ) {
63	return makeGenericSubstitution( inst );
64	} else {
65	return TypeSubstitution();
66	}
67	}
68
69	class MemberIterator {
70	public:
71	virtual ~MemberIterator() {}
72
73	/// walks the current object using the given designators as a guide
74	virtual void setPosition( std::list< Expression * > & designators ) = 0;
75
76	/// retrieve the list of possible Type/Designation pairs for the current position in the currect object
77	virtual std::list<InitAlternative> operator*() const = 0;
78
79	/// true if the iterator is not currently at the end
80	virtual operator bool() const = 0;
81
82	/// moves the iterator by one member in the current object
83	virtual MemberIterator & bigStep() = 0;
84
85	/// moves the iterator by one member in the current subobject
86	virtual MemberIterator & smallStep() = 0;
87
88	/// the type of the current object
89	virtual Type * getType() = 0;
90
91	/// the type of the current subobject
92	virtual Type * getNext() = 0;
93
94	/// printing for debug
95	virtual void print( std::ostream & out, Indenter indent ) const = 0;
96
97	/// helper for operator*; aggregates must add designator to each init alternative, but
98	/// adding designators in operator* creates duplicates.
99	virtual std::list<InitAlternative> first() const = 0; // should be protected
100	};
101
102	std::ostream & operator<<(std::ostream & out, const MemberIterator & it) {
103	Indenter indenter;
104	it.print( out, indenter );
105	return out;
106	}
107
108	/// create a new MemberIterator that traverses a type correctly
109	MemberIterator * createMemberIterator( Type * type );
110
111	/// iterates "other" types, e.g. basic types, pointer types, etc. which do not change at list initializer entry
112	class SimpleIterator : public MemberIterator {
113	public:
114	SimpleIterator( Type * type ) : type( type ) {}
115
116	virtual void setPosition( std::list< Expression * > & designators ) {
117	assertf( designators.empty(), "simple iterator given non-empty designator..." ); // xxx - might be semantic error
118	}
119
120	virtual std::list<InitAlternative> operator*() const { return first(); }
121	virtual operator bool() const { return type; }
122
123	// big step is the same as small step
124	virtual MemberIterator & bigStep() { return smallStep(); }
125	virtual MemberIterator & smallStep() {
126	type = nullptr; // type is nullified on increment since SimpleIterators do not have members
127	return *this;
128	}
129
130	virtual void print( std::ostream & out, __attribute__((unused)) Indenter indent ) const {
131	out << "SimpleIterator(" << type << ")";
132	}
133
134	virtual Type * getType() { return type; }
135	virtual Type * getNext() { return type; }
136
137	protected:
138	virtual std::list<InitAlternative> first() const {
139	if ( type ) return std::list<InitAlternative>{ { type->clone(), new Designation( {} ) } };
140	else return std::list<InitAlternative>{};
141	}
142	private:
143	Type * type = nullptr;
144	};
145
146	class ArrayIterator : public MemberIterator {
147	public:
148	ArrayIterator( ArrayType * at ) : array( at ) {
149	PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
150	base = at->base;
151	memberIter = createMemberIterator( base );
152	if ( at->isVarLen ) SemanticError( at, "VLA initialization does not support @=: " );
153	setSize( at->dimension );
154	}
155
156	~ArrayIterator() {
157	delete memberIter;
158	}
159
160	private:
161	void setSize( Expression * expr ) {
162	auto res = eval( expr );
163	if (res.second) {
164	size = res.first;
165	} else {
166	SemanticError( expr->location, toString("Array designator must be a constant expression: ", expr) );
167	}
168	}
169
170	public:
171	void setPosition( Expression * expr ) {
172	// need to permit integer-constant-expressions, including: integer constants, enumeration constants, character constants, sizeof expressions, _Alignof expressions, cast expressions
173	auto arg = eval( expr );
174	index = arg.first;
175	return;
176
177	// if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
178	// try {
179	// index = constExpr->intValue();
180	// } catch( SemanticErrorException & ) {
181	// SemanticError( expr, "Constant expression of non-integral type in array designator: " );
182	// }
183	// } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
184	// setPosition( castExpr->get_arg() );
185	// } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
186	// EnumInstType * inst = dynamic_cast<EnumInstType *>( varExpr->get_result() );
187	// assertf( inst, "ArrayIterator given variable that isn't an enum constant : %s", toString( expr ).c_str() );
188	// long long int value;
189	// if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {
190	// index = value;
191	// }
192	// } else if ( dynamic_cast< SizeofExpr * >( expr ) \|\| dynamic_cast< AlignofExpr * >( expr ) ) {
193	// index = 0; // xxx - get actual sizeof/alignof value?
194	// } else {
195	// assertf( false, "4 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
196	// }
197	}
198
199	virtual void setPosition( std::list< Expression * > & designators ) {
200	if ( ! designators.empty() ) {
201	setPosition( designators.front() );
202	designators.pop_front();
203	memberIter->setPosition( designators );
204	}
205	}
206
207	virtual std::list<InitAlternative> operator*() const {
208	return first();
209	}
210
211	virtual operator bool() const { return index < size; }
212
213	virtual MemberIterator & bigStep() {
214	PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
215	++index;
216	delete memberIter;
217	if ( index < size ) memberIter = createMemberIterator( base );
218	else memberIter = nullptr;
219	return *this;
220	}
221
222	virtual MemberIterator & smallStep() {
223	PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
224	if ( memberIter ) {
225	PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
226	memberIter->smallStep();
227	if ( *memberIter ) {
228	PRINT( std::cerr << "has valid member iter" << std::endl; )
229	return *this;
230	}
231	}
232	return bigStep();
233	}
234
235	virtual Type * getType() { return array; }
236	virtual Type * getNext() { return base; }
237
238	virtual std::list<InitAlternative> first() const {
239	PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
240	if ( memberIter && *memberIter ) {
241	std::list<InitAlternative> ret = memberIter->first();
242	for ( InitAlternative & alt : ret ) {
243	alt.designation->get_designators().push_front( new ConstantExpr( Constant::from_ulong( index ) ) );
244	}
245	return ret;
246	}
247	return std::list<InitAlternative>();
248	}
249
250	virtual void print( std::ostream & out, Indenter indent ) const {
251	out << "ArrayIterator(Array of " << base << ")";
252	if ( memberIter ) {
253	Indenter childIndent = indent+1;
254	out << std::endl << childIndent;
255	memberIter->print( out, childIndent );
256	}
257	}
258
259	private:
260	ArrayType * array = nullptr;
261	Type * base = nullptr;
262	size_t index = 0;
263	size_t size = 0;
264	MemberIterator * memberIter = nullptr;
265	};
266
267	class AggregateIterator : public MemberIterator {
268	public:
269	typedef std::list<Declaration *> MemberList;
270	typedef MemberList::const_iterator iterator;
271	std::string kind = ""; // for debug
272	std::string name;
273	Type * inst = nullptr;
274	const MemberList & members;
275	iterator curMember;
276	bool atbegin = true; // false at first {small,big}Step -- this aggr type is only added to the possibilities at the beginning
277	Type * curType = nullptr;
278	MemberIterator * memberIter = nullptr;
279	mutable TypeSubstitution sub;
280
281	AggregateIterator( const std::string & kind, const std::string & name, Type * inst, const MemberList & members ) : kind( kind ), name( name ), inst( inst ), members( members ), curMember( members.begin() ), sub( makeGenericSubstitution( inst ) ) {
282	PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
283	init();
284	}
285
286	virtual ~AggregateIterator() {
287	delete memberIter;
288	}
289
290	bool init() {
291	PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
292	if ( curMember != members.end() ) {
293	if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( *curMember ) ) {
294	PRINT( std::cerr << "incremented to field: " << field << std::endl; )
295	curType = field->get_type();
296	memberIter = createMemberIterator( curType );
297	return true;
298	}
299	}
300	return false;
301	}
302
303	virtual std::list<InitAlternative> operator*() const {
304	if (memberIter && *memberIter) {
305	std::list<InitAlternative> ret = memberIter->first();
306	PRINT( std::cerr << "sub: " << sub << std::endl; )
307	for ( InitAlternative & alt : ret ) {
308	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
309	alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
310	// need to substitute for generic types, so that casts are to concrete types
311	PRINT( std::cerr << " type is: " << alt.type; )
312	sub.apply( alt.type ); // also apply to designation??
313	PRINT( std::cerr << " ==> " << alt.type << std::endl; )
314	}
315	return ret;
316	}
317	return std::list<InitAlternative>();
318	}
319
320	virtual void setPosition( std::list< Expression * > & designators ) {
321	if ( ! designators.empty() ) {
322	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( designators.front() ) ) {
323	for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
324	if ( *curMember == varExpr->get_var() ) {
325	designators.pop_front();
326	delete memberIter;
327	memberIter = createMemberIterator( varExpr->get_result() );
328	curType = varExpr->get_result();
329	atbegin = curMember == members.begin() && designators.empty(); // xxx - is this the right condition for atbegin??
330	memberIter->setPosition( designators );
331	return;
332	} // if
333	} // for
334	assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
335	} else {
336	assertf( false, "3 bad designator given to %s: %s", kind.c_str(), toString( designators.front() ).c_str() );
337	} // if
338	} // if
339	}
340
341	virtual MemberIterator & smallStep() {
342	PRINT( std::cerr << "smallStep in " << kind << std::endl; )
343	atbegin = false;
344	if ( memberIter ) {
345	PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
346	memberIter->smallStep();
347	if ( *memberIter ) {
348	PRINT( std::cerr << "success!" << std::endl; )
349	return *this;
350	}
351	}
352	return bigStep();
353	}
354
355	virtual Type * getType() { return inst; }
356	virtual Type * getNext() {
357	if ( memberIter && *memberIter ) return memberIter->getType(); // xxx - ??? recursive call???
358	return nullptr;
359	}
360
361	virtual std::list<InitAlternative> first() const {
362	std::list<InitAlternative> ret;
363	PRINT( std::cerr << "first " << kind << std::endl; )
364	if ( memberIter && memberIter ) { // might not need memberIter??
365	PRINT( std::cerr << "adding children" << std::endl; )
366	ret = memberIter->first();
367	for ( InitAlternative & alt : ret ) {
368	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
369	alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
370	}
371	}
372	if ( atbegin ) {
373	// xxx - what about case of empty struct??
374	// only add self if at the very beginning of the structure
375	PRINT( std::cerr << "adding self" << std::endl; )
376	ret.push_front( { inst->clone(), new Designation( {} ) } );
377	}
378	return ret;
379	}
380
381	virtual void print( std::ostream & out, Indenter indent ) const {
382	out << kind << "(" << name << ")";
383	if ( memberIter ) {
384	Indenter childIndent = indent+1;
385	out << std::endl << childIndent;
386	memberIter->print( out, childIndent );
387	}
388	}
389	};
390
391	class UnionIterator : public AggregateIterator {
392	public:
393	UnionIterator( UnionInstType * inst ) : AggregateIterator( "UnionIterator", inst->get_name(), inst, inst->get_baseUnion()->get_members() ) {}
394
395	virtual operator bool() const { return (memberIter && *memberIter); }
396	virtual MemberIterator & bigStep() {
397	// unions only initialize one member
398	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
399	atbegin = false;
400	delete memberIter;
401	memberIter = nullptr;
402	curType = nullptr;
403	curMember = members.end();
404	return *this;
405	}
406	};
407
408	class StructIterator : public AggregateIterator {
409	public:
410	StructIterator( StructInstType * inst ) : AggregateIterator( "StructIterator", inst->get_name(), inst, inst->get_baseStruct()->get_members() ) {}
411
412	virtual operator bool() const { return curMember != members.end() \|\| (memberIter && *memberIter); }
413
414	virtual MemberIterator & bigStep() {
415	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
416	atbegin = false;
417	delete memberIter;
418	memberIter = nullptr;
419	curType = nullptr;
420	for ( ; curMember != members.end(); ) {
421	++curMember;
422	if ( init() ) {
423	return *this;
424	}
425	}
426	return *this;
427	}
428	};
429
430	class TupleIterator : public AggregateIterator {
431	public:
432	TupleIterator( TupleType * inst ) : AggregateIterator( "TupleIterator", toString("Tuple", inst->size()), inst, inst->get_members() ) {}
433
434	virtual operator bool() const { return curMember != members.end() \|\| (memberIter && *memberIter); }
435
436	virtual MemberIterator & bigStep() {
437	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
438	atbegin = false;
439	delete memberIter;
440	memberIter = nullptr;
441	curType = nullptr;
442	for ( ; curMember != members.end(); ) {
443	++curMember;
444	if ( init() ) {
445	return *this;
446	}
447	}
448	return *this;
449	}
450	};
451
452	MemberIterator * createMemberIterator( Type * type ) {
453	if ( ReferenceToType * aggr = dynamic_cast< ReferenceToType * >( type ) ) {
454	if ( StructInstType * sit = dynamic_cast< StructInstType * >( aggr ) ) {
455	return new StructIterator( sit );
456	} else if ( UnionInstType * uit = dynamic_cast< UnionInstType * >( aggr ) ) {
457	return new UnionIterator( uit );
458	} else {
459	assertf( dynamic_cast< EnumInstType * >( type ) \|\| dynamic_cast< TypeInstType * >( type ), "Encountered unhandled ReferenceToType in createMemberIterator: %s", toString( type ).c_str() );
460	return new SimpleIterator( type );
461	}
462	} else if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
463	return new ArrayIterator( at );
464	} else if ( TupleType * tt = dynamic_cast< TupleType * >( type ) ) {
465	return new TupleIterator( tt );
466	} else {
467	return new SimpleIterator( type );
468	}
469	}
470
471	CurrentObject::CurrentObject() {}
472	CurrentObject::CurrentObject( Type * type ) {
473	objStack.push( new SimpleIterator( type ) );
474	}
475
476
477	void CurrentObject::setNext( Designation * designation ) {
478	assertf( ! objStack.empty(), "obj stack empty in setNext" );
479	PRINT( std::cerr << "____setNext" << designation << std::endl; )
480	objStack.top()->setPosition( designation->get_designators() );
481	}
482
483	Designation * CurrentObject::findNext( Designation * designation ) {
484	typedef std::list< Expression * > DesignatorChain;
485	PRINT( std::cerr << "___findNext" << std::endl; )
486	// find all the d's
487	std::list<DesignatorChain> desigAlts{ { } }, newDesigAlts;
488	std::list<Type *> curTypes { (objStack.top())->getType() }, newTypes;
489	for ( Expression * expr : designation->get_designators() ) {
490	PRINT( std::cerr << "____untyped: " << expr << std::endl; )
491	std::list<DesignatorChain>::iterator dit = desigAlts.begin();
492	if ( NameExpr * nexpr = dynamic_cast<NameExpr *>(expr) ) {
493	for ( Type * t : curTypes ) {
494	assert( dit != desigAlts.end() );
495	DesignatorChain & d = *dit;
496	PRINT( std::cerr << "____actual: " << t << std::endl; )
497	ReferenceToType * refType = dynamic_cast<ReferenceToType *>(t);
498	std::list<Declaration *> members;
499	if ( refType ) {
500	refType->lookup( nexpr->get_name(), members ); // concatenate identical field name
501	// xxx - need to also include anonymous members in this somehow...
502	for ( Declaration * mem: members ) {
503	if ( ObjectDecl * field = dynamic_cast<ObjectDecl *>(mem) ) {
504	PRINT( std::cerr << "____alt: " << field->get_type() << std::endl; )
505	DesignatorChain newD = d;
506	newD.push_back( new VariableExpr( field ) );
507	newDesigAlts.push_back( newD );
508	newTypes.push_back( field->get_type() );
509	} // if
510	} // for
511	} // if
512	++dit;
513	} // for
514	} else {
515	for ( Type * t : curTypes ) {
516	assert( dit != desigAlts.end() );
517	DesignatorChain & d = *dit;
518	if ( ArrayType * at = dynamic_cast< ArrayType * > ( t ) ) {
519	PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
520	d.push_back( expr );
521	newDesigAlts.push_back( d );
522	newTypes.push_back( at->get_base() );
523	}
524	++dit;
525	} // for
526	} // if
527	desigAlts = newDesigAlts;
528	newDesigAlts.clear();
529	curTypes = newTypes;
530	newTypes.clear();
531	assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
532	} // for
533	if ( desigAlts.size() > 1 ) {
534	SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
535	} else if ( desigAlts.size() == 0 ) {
536	SemanticError( designation, "No reasonable alternatives for designation: " );
537	}
538	DesignatorChain & d = desigAlts.back();
539	PRINT( for ( Expression * expr : d ) {
540	std::cerr << "____desig: " << expr << std::endl;
541	} ) // for
542	assertf( ! curTypes.empty(), "empty designator chosen");
543
544	// set new designators
545	assertf( ! objStack.empty(), "empty object stack when setting designation" );
546	Designation * actualDesignation = new Designation( d );
547	objStack.top()->setPosition( d ); // destroys d
548	return actualDesignation;
549	}
550
551	void CurrentObject::increment() {
552	PRINT( std::cerr << "____increment" << std::endl; )
553	if ( ! objStack.empty() ) {
554	PRINT( std::cerr << *objStack.top() << std::endl; )
555	objStack.top()->smallStep();
556	}
557	}
558
559	void CurrentObject::enterListInit() {
560	PRINT( std::cerr << "____entering list init" << std::endl; )
561	assertf( ! objStack.empty(), "empty obj stack entering list init" );
562	Type * type = objStack.top()->getNext();
563	if ( type ) {
564	objStack.push( createMemberIterator( type ) );
565	} else {
566	assertf( false, "not sure about this case..." );
567	}
568	}
569
570	void CurrentObject::exitListInit() {
571	PRINT( std::cerr << "____exiting list init" << std::endl; )
572	assertf( ! objStack.empty(), "objstack empty" );
573	delete objStack.top();
574	objStack.pop();
575	if ( ! objStack.empty() ) {
576	PRINT( std::cerr << *objStack.top() << std::endl; )
577	objStack.top()->bigStep();
578	}
579	}
580
581	std::list< InitAlternative > CurrentObject::getOptions() {
582	PRINT( std::cerr << "____getting current options" << std::endl; )
583	assertf( ! objStack.empty(), "objstack empty in getOptions" );
584	return **objStack.top();
585	}
586
587	Type * CurrentObject::getCurrentType() {
588	PRINT( std::cerr << "____getting current type" << std::endl; )
589	assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
590	return objStack.top()->getNext();
591	}
592	} // namespace ResolvExpr
593
594	namespace ast {
595	/// Iterates members of a type by initializer.
596	class MemberIterator {
597	public:
598	virtual ~MemberIterator() {}
599
600	/// Internal set position based on iterator ranges.
601	virtual void setPosition(
602	std::deque< ptr< Expr > >::const_iterator it,
603	std::deque< ptr< Expr > >::const_iterator end ) = 0;
604
605	/// Walks the current object using the given designators as a guide.
606	void setPosition( const std::deque< ptr< Expr > > & designators ) {
607	setPosition( designators.begin(), designators.end() );
608	}
609
610	/// Retrieve the list of possible (Type,Designation) pairs for the
611	/// current position in the current object.
612	virtual std::deque< InitAlternative > operator* () const = 0;
613
614	/// True if the iterator is not currently at the end.
615	virtual operator bool() const = 0;
616
617	/// Moves the iterator by one member in the current object.
618	virtual MemberIterator & bigStep() = 0;
619
620	/// Moves the iterator by one member in the current subobject.
621	virtual MemberIterator & smallStep() = 0;
622
623	/// The type of the current object.
624	virtual const Type * getType() = 0;
625
626	/// The type of the current subobject.
627	virtual const Type * getNext() = 0;
628
629	/// Helper for operator*; aggregates must add designator to each init
630	/// alternative, but adding designators in operator* creates duplicates.
631	virtual std::deque< InitAlternative > first() const = 0;
632	};
633
634	/// create a new MemberIterator that traverses a type correctly
635	MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type );
636
637	/// Iterates "other" types (e.g. basic, pointer) which do not change at list initializer entry
638	class SimpleIterator final : public MemberIterator {
639	CodeLocation location;
640	const Type * type = nullptr;
641	public:
642	SimpleIterator( const CodeLocation & loc, const Type * t ) : location( loc ), type( t ) {}
643
644	void setPosition(
645	std::deque< ptr< Expr > >::const_iterator begin,
646	std::deque< ptr< Expr > >::const_iterator end
647	) override {
648	if ( begin != end ) {
649	SemanticError( location, "Un-designated initializer given non-empty designator" );
650	}
651	}
652
653	std::deque< InitAlternative > operator* () const override { return first(); }
654
655	operator bool() const override { return type; }
656
657	SimpleIterator & bigStep() override { return smallStep(); }
658	SimpleIterator & smallStep() override {
659	type = nullptr; // empty on increment because no members
660	return *this;
661	}
662
663	const Type * getType() override { return type; }
664
665	const Type * getNext() override { return type; }
666
667	std::deque< InitAlternative > first() const override {
668	if ( type ) return { InitAlternative{ type, new Designation{ location } } };
669	return {};
670	}
671	};
672
673	/// Iterates over an indexed type:
674	class IndexIterator : public MemberIterator {
675	protected:
676	CodeLocation location;
677	size_t index = 0;
678	size_t size = 0;
679	std::unique_ptr<MemberIterator> memberIter;
680	public:
681	IndexIterator( const CodeLocation & loc, size_t size ) :
682	location( loc ), size( size )
683	{}
684
685	void setPosition( const Expr * expr ) {
686	// need to permit integer-constant-expressions, including: integer constants,
687	// enumeration constants, character constants, sizeof expressions, alignof expressions,
688	// cast expressions
689
690	auto arg = eval( expr );
691	index = arg.first;
692
693	// if ( auto constExpr = dynamic_cast< const ConstantExpr * >( expr ) ) {
694	// try {
695	// index = constExpr->intValue();
696	// } catch ( SemanticErrorException & ) {
697	// SemanticError( expr, "Constant expression of non-integral type in array designator: " );
698	// }
699	// } else if ( auto castExpr = dynamic_cast< const CastExpr * >( expr ) ) {
700	// setPosition( castExpr->arg );
701	// } else if ( dynamic_cast< const SizeofExpr * >( expr ) \|\| dynamic_cast< const AlignofExpr * >( expr ) ) {
702	// index = 0;
703	// } else {
704	// assertf( false, "2 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
705	// }
706	}
707
708	void setPosition(
709	std::deque<ast::ptr<ast::Expr>>::const_iterator begin,
710	std::deque<ast::ptr<ast::Expr>>::const_iterator end
711	) override {
712	if ( begin == end ) return;
713
714	setPosition( *begin );
715	memberIter->setPosition( ++begin, end );
716	}
717
718	std::deque< InitAlternative > operator* () const override { return first(); }
719
720	operator bool() const override { return index < size; }
721	};
722
723	/// Iterates over the members of array types:
724	class ArrayIterator final : public IndexIterator {
725	const ArrayType * array = nullptr;
726	const Type * base = nullptr;
727
728	size_t getSize( const Expr * expr ) {
729	auto res = eval( expr );
730	if ( !res.second ) {
731	SemanticError( location, toString( "Array designator must be a constant expression: ", expr ) );
732	}
733	return res.first;
734	}
735
736	public:
737	ArrayIterator( const CodeLocation & loc, const ArrayType * at ) :
738	IndexIterator( loc, getSize( at->dimension) ),
739	array( at ), base( at->base ) {
740	PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
741	memberIter.reset( createMemberIterator( loc, base ) );
742	if ( at->isVarLen ) {
743	SemanticError( location, at, "VLA initialization does not support @=: " );
744	}
745	}
746
747	ArrayIterator & bigStep() override {
748	PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
749	++index;
750	memberIter.reset( index < size ? createMemberIterator( location, base ) : nullptr );
751	return *this;
752	}
753
754	ArrayIterator & smallStep() override {
755	PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
756	if ( memberIter ) {
757	PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
758	memberIter->smallStep();
759	if ( *memberIter ) {
760	PRINT( std::cerr << "has valid member iter" << std::endl; )
761	return *this;
762	}
763	}
764	return bigStep();
765	}
766
767	const Type * getType() override { return array; }
768
769	const Type * getNext() override { return base; }
770
771	std::deque< InitAlternative > first() const override {
772	PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
773	if ( memberIter && *memberIter ) {
774	std::deque< InitAlternative > ret = memberIter->first();
775	for ( InitAlternative & alt : ret ) {
776	alt.designation.get_and_mutate()->designators.emplace_front( ConstantExpr::from_ulong( location, index ) );
777	}
778	return ret;
779	}
780	return {};
781	}
782	};
783
784	class AggregateIterator : public MemberIterator {
785	protected:
786	using MemberList = std::vector< ptr< Decl > >;
787
788	CodeLocation location;
789	std::string kind; // for debug
790	std::string name;
791	const Type * inst;
792	const MemberList & members;
793	MemberList::const_iterator curMember;
794	bool atbegin = true; // false at first {small,big}Step
795	const Type * curType = nullptr;
796	std::unique_ptr< MemberIterator > memberIter = nullptr;
797	TypeSubstitution sub;
798
799	bool init() {
800	PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
801	if ( curMember != members.end() ) {
802	if ( auto field = curMember->as< ObjectDecl >() ) {
803	PRINT( std::cerr << "incremented to field: " << field << std::endl; )
804	curType = field->get_type();
805	memberIter.reset( createMemberIterator( location, curType ) );
806	return true;
807	}
808	}
809	return false;
810	}
811
812	AggregateIterator(
813	const CodeLocation & loc, const std::string k, const std::string & n, const Type * i,
814	const MemberList & ms )
815	: location( loc ), kind( k ), name( n ), inst( i ), members( ms ), curMember( ms.begin() ),
816	sub( genericSubstitution( i ) ) {
817	PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
818	init();
819	}
820
821	public:
822	void setPosition(
823	std::deque< ptr< Expr > >::const_iterator begin,
824	std::deque< ptr< Expr > >::const_iterator end
825	) final {
826	if ( begin == end ) return;
827
828	if ( auto varExpr = begin->as< VariableExpr >() ) {
829	for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
830	if ( *curMember != varExpr->var ) continue;
831
832	++begin;
833
834	memberIter.reset( createMemberIterator( location, varExpr->result ) );
835	curType = varExpr->result;
836	atbegin = curMember == members.begin() && begin == end;
837	memberIter->setPosition( begin, end );
838	return;
839	}
840	assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
841	} else {
842	assertf( false, "1 bad designator given to %s: %s", kind.c_str(), toString( *begin ).c_str() );
843	}
844	}
845
846	std::deque< InitAlternative > operator* () const final {
847	if ( memberIter && *memberIter ) {
848	std::deque< InitAlternative > ret = memberIter->first();
849	PRINT( std::cerr << "sub: " << sub << std::endl; )
850	for ( InitAlternative & alt : ret ) {
851	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
852	alt.designation.get_and_mutate()->designators.emplace_front(
853	new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
854	// need to substitute for generic types so that casts are to concrete types
855	alt.type = shallowCopy(alt.type.get());
856	PRINT( std::cerr << " type is: " << alt.type; )
857	sub.apply( alt.type ); // also apply to designation??
858	PRINT( std::cerr << " ==> " << alt.type << std::endl; )
859	}
860	return ret;
861	}
862	return {};
863	}
864
865	AggregateIterator & smallStep() final {
866	PRINT( std::cerr << "smallStep in " << kind << std::endl; )
867	atbegin = false;
868	if ( memberIter ) {
869	PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
870	memberIter->smallStep();
871	if ( *memberIter ) {
872	PRINT( std::cerr << "success!" << std::endl; )
873	return *this;
874	}
875	}
876	return bigStep();
877	}
878
879	AggregateIterator & bigStep() override = 0;
880
881	const Type * getType() final { return inst; }
882
883	const Type * getNext() final {
884	bool hasMember = memberIter && *memberIter;
885	return hasMember ? memberIter->getType() : nullptr;
886	}
887
888	std::deque< InitAlternative > first() const final {
889	std::deque< InitAlternative > ret;
890	PRINT( std::cerr << "first " << kind << std::endl; )
891	if ( memberIter && *memberIter ) {
892	PRINT( std::cerr << "adding children" << std::endl; )
893	ret = memberIter->first();
894	for ( InitAlternative & alt : ret ) {
895	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
896	alt.designation.get_and_mutate()->designators.emplace_front(
897	new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
898	}
899	}
900	if ( atbegin ) {
901	// only add self if at the very beginning of the structure
902	PRINT( std::cerr << "adding self" << std::endl; )
903	ret.emplace_front( inst, new Designation{ location } );
904	}
905	return ret;
906	}
907	};
908
909	class StructIterator final : public AggregateIterator {
910	public:
911	StructIterator( const CodeLocation & loc, const StructInstType * inst )
912	: AggregateIterator( loc, "StructIterator", inst->name, inst, inst->base->members ) {}
913
914	operator bool() const override {
915	return curMember != members.end() \|\| (memberIter && *memberIter);
916	}
917
918	StructIterator & bigStep() override {
919	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
920	atbegin = false;
921	memberIter = nullptr;
922	curType = nullptr;
923	while ( curMember != members.end() ) {
924	++curMember;
925	if ( init() ) return *this;
926	}
927	return *this;
928	}
929	};
930
931	class UnionIterator final : public AggregateIterator {
932	public:
933	UnionIterator( const CodeLocation & loc, const UnionInstType * inst )
934	: AggregateIterator( loc, "UnionIterator", inst->name, inst, inst->base->members ) {}
935
936	operator bool() const override { return memberIter && *memberIter; }
937
938	UnionIterator & bigStep() override {
939	// unions only initialize one member
940	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
941	atbegin = false;
942	memberIter = nullptr;
943	curType = nullptr;
944	curMember = members.end();
945	return *this;
946	}
947	};
948
949	/// Iterates across the positions in a tuple:
950	class TupleIterator final : public IndexIterator {
951	ast::TupleType const * const tuple;
952
953	const ast::Type * typeAtIndex() const {
954	assert( index < size );
955	return tuple->types[ index ].get();
956	}
957
958	public:
959	TupleIterator( const CodeLocation & loc, const TupleType * type )
960	: IndexIterator( loc, type->size() ), tuple( type ) {
961	PRINT( std::cerr << "Creating tuple iterator: " << type << std::endl; )
962	memberIter.reset( createMemberIterator( loc, typeAtIndex() ) );
963	}
964
965	TupleIterator & bigStep() override {
966	++index;
967	memberIter.reset( index < size ?
968	createMemberIterator( location, typeAtIndex() ) : nullptr );
969	return *this;
970	}
971
972	TupleIterator & smallStep() override {
973	if ( memberIter ) {
974	PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
975	memberIter->smallStep();
976	if ( !memberIter ) {
977	PRINT( std::cerr << "has valid member iter" << std::endl; )
978	return *this;
979	}
980	}
981	return bigStep();
982	}
983
984	const ast::Type * getType() override {
985	return tuple;
986	}
987
988	const ast::Type * getNext() override {
989	bool hasMember = memberIter && *memberIter;
990	return hasMember ? memberIter->getType() : nullptr;
991	}
992
993	std::deque< InitAlternative > first() const override {
994	PRINT( std::cerr << "first in TupleIterator (" << index << "/" << size << ")" << std::endl; )
995	if ( memberIter && *memberIter ) {
996	std::deque< InitAlternative > ret = memberIter->first();
997	for ( InitAlternative & alt : ret ) {
998	alt.designation.get_and_mutate()->designators.emplace_front(
999	ConstantExpr::from_ulong( location, index ) );
1000	}
1001	return ret;
1002	}
1003	return {};
1004	}
1005	};
1006
1007	MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type ) {
1008	if ( auto aggr = dynamic_cast< const BaseInstType * >( type ) ) {
1009	if ( auto sit = dynamic_cast< const StructInstType * >( aggr ) ) {
1010	assert( sit->base );
1011	return new StructIterator{ loc, sit };
1012	} else if ( auto uit = dynamic_cast< const UnionInstType * >( aggr ) ) {
1013	assert( uit->base );
1014	return new UnionIterator{ loc, uit };
1015	} else {
1016	assertf(
1017	dynamic_cast< const EnumInstType * >( type )
1018	\|\| dynamic_cast< const TypeInstType * >( type ),
1019	"Encountered unhandled BaseInstType in createMemberIterator: %s",
1020	toString( type ).c_str() );
1021	return new SimpleIterator{ loc, type };
1022	}
1023	} else if ( auto at = dynamic_cast< const ArrayType * >( type ) ) {
1024	return new ArrayIterator{ loc, at };
1025	} else if ( auto tt = dynamic_cast< const TupleType * >( type ) ) {
1026	return new TupleIterator{ loc, tt };
1027	} else {
1028	return new SimpleIterator{ loc, type };
1029	}
1030	}
1031
1032	CurrentObject::CurrentObject( const CodeLocation & loc, const Type * type ) : objStack() {
1033	objStack.emplace_back( new SimpleIterator{ loc, type } );
1034	}
1035
1036	const Designation * CurrentObject::findNext( const Designation * designation ) {
1037	using DesignatorChain = std::deque< ptr< Expr > >;
1038	PRINT( std::cerr << "___findNext" << std::endl; )
1039
1040	// find all the d's
1041	std::vector< DesignatorChain > desigAlts{ {} }, newDesigAlts;
1042	std::deque< const Type * > curTypes{ objStack.back()->getType() }, newTypes;
1043	for ( const Expr * expr : designation->designators ) {
1044	PRINT( std::cerr << "____untyped: " << expr << std::endl; )
1045	auto dit = desigAlts.begin();
1046	if ( auto nexpr = dynamic_cast< const NameExpr * >( expr ) ) {
1047	for ( const Type * t : curTypes ) {
1048	assert( dit != desigAlts.end() );
1049
1050	DesignatorChain & d = *dit;
1051	PRINT( std::cerr << "____actual: " << t << std::endl; )
1052	if ( auto refType = dynamic_cast< const BaseInstType * >( t ) ) {
1053	// concatenate identical field names
1054	for ( const Decl * mem : refType->lookup( nexpr->name ) ) {
1055	if ( auto field = dynamic_cast< const ObjectDecl * >( mem ) ) {
1056	PRINT( std::cerr << "____alt: " << field->type << std::endl; )
1057	DesignatorChain d2 = d;
1058	d2.emplace_back( new VariableExpr{ expr->location, field } );
1059	newDesigAlts.emplace_back( std::move( d2 ) );
1060	newTypes.emplace_back( field->type );
1061	}
1062	}
1063	}
1064
1065	++dit;
1066	}
1067	} else {
1068	for ( const Type * t : curTypes ) {
1069	assert( dit != desigAlts.end() );
1070
1071	DesignatorChain & d = *dit;
1072	if ( auto at = dynamic_cast< const ArrayType * >( t ) ) {
1073	PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
1074	d.emplace_back( expr );
1075	newDesigAlts.emplace_back( d );
1076	newTypes.emplace_back( at->base );
1077	}
1078	}
1079	}
1080
1081	// reset queue
1082	desigAlts = std::move( newDesigAlts );
1083	newDesigAlts.clear();
1084	curTypes = std::move( newTypes );
1085	newTypes.clear();
1086	assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
1087	}
1088
1089	if ( desigAlts.size() > 1 ) {
1090	SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
1091	} else if ( desigAlts.empty() ) {
1092	SemanticError( designation, "No reasonable alternatives for designation: " );
1093	}
1094
1095	DesignatorChain & d = desigAlts.back();
1096	PRINT( for ( Expression * expr : d ) {
1097	std::cerr << "____desig: " << expr << std::endl;
1098	} ) // for
1099	assertf( ! curTypes.empty(), "empty designator chosen");
1100
1101	// set new designators
1102	assertf( ! objStack.empty(), "empty object stack when setting designation" );
1103	Designation * actualDesignation =
1104	new Designation{ designation->location, DesignatorChain{d} };
1105	objStack.back()->setPosition( d ); // destroys d
1106	return actualDesignation;
1107	}
1108
1109	void CurrentObject::setNext( const Designation * designation ) {
1110	PRINT( std::cerr << "____setNext" << designation << std::endl; )
1111	assertf( ! objStack.empty(), "obj stack empty in setNext" );
1112	objStack.back()->setPosition( designation->designators );
1113	}
1114
1115	void CurrentObject::increment() {
1116	PRINT( std::cerr << "____increment" << std::endl; )
1117	if ( objStack.empty() ) return;
1118	PRINT( std::cerr << *objStack.back() << std::endl; )
1119	objStack.back()->smallStep();
1120	}
1121
1122	void CurrentObject::enterListInit( const CodeLocation & loc ) {
1123	PRINT( std::cerr << "____entering list init" << std::endl; )
1124	assertf( ! objStack.empty(), "empty obj stack entering list init" );
1125	const ast::Type * type = objStack.back()->getNext();
1126	assert( type );
1127	objStack.emplace_back( createMemberIterator( loc, type ) );
1128	}
1129
1130	void CurrentObject::exitListInit() {
1131	PRINT( std::cerr << "____exiting list init" << std::endl; )
1132	assertf( ! objStack.empty(), "objstack empty" );
1133	objStack.pop_back();
1134	if ( ! objStack.empty() ) {
1135	PRINT( std::cerr << *objStack.back() << std::endl; )
1136	objStack.back()->bigStep();
1137	}
1138	}
1139
1140	std::deque< InitAlternative > CurrentObject::getOptions() {
1141	PRINT( std::cerr << "____getting current options" << std::endl; )
1142	assertf( ! objStack.empty(), "objstack empty in getOptions" );
1143	return **objStack.back();
1144	}
1145
1146	const Type * CurrentObject::getCurrentType() {
1147	PRINT( std::cerr << "____getting current type" << std::endl; )
1148	assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
1149	return objStack.back()->getNext();
1150	}
1151	}
1152
1153	// Local Variables: //
1154	// tab-width: 4 //
1155	// mode: c++ //
1156	// compile-command: "make install" //
1157	// End: //

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