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source: src/ResolvExpr/CurrentObject.cc @ 0f1336c

ADTast-experimentalpthread-emulation

Last change on this file since 0f1336c was f37d9e7, checked in by Peter A. Buhr <pabuhr@…>, 2 years ago
change CurrentObject?.cc to use eval rather than ad-hoc constant-expression evaluation
Property mode set to `100644`
File size: 37.0 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 : Peter A. Buhr
12	// Last Modified On : Fri Jul 1 09:16:01 2022
13	// Update Count : 15
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/Indenter.h" // for Indenter, operator<<
31	#include "Common/SemanticError.h" // for SemanticError
32	#include "Common/utility.h" // for toString
33	#include "CurrentObject.h"
34	#include "SynTree/Constant.h" // for Constant
35	#include "SynTree/Declaration.h" // for ObjectDecl, Declaration, Struc...
36	#include "SynTree/Expression.h" // for InitAlternative, VariableExpr
37	#include "SynTree/Initializer.h" // for Designation, operator<<
38	#include "SynTree/Type.h" // for Type, StructInstType, UnionIns...
39	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
40
41	#if 0
42	#define PRINT(x) x
43	#else
44	#define PRINT(x)
45	#endif
46
47	namespace ResolvExpr {
48	template< typename AggrInst >
49	TypeSubstitution makeGenericSubstitution( AggrInst * inst ) {
50	assert( inst );
51	assert( inst->get_baseParameters() );
52	std::list< TypeDecl * > baseParams = *inst->get_baseParameters();
53	std::list< Expression * > typeSubs = inst->get_parameters();
54	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
55	return subs;
56	}
57
58	TypeSubstitution makeGenericSubstitution( Type * type ) {
59	if ( StructInstType * inst = dynamic_cast< StructInstType * >( type ) ) {
60	return makeGenericSubstitution( inst );
61	} else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( type ) ) {
62	return makeGenericSubstitution( inst );
63	} else {
64	return TypeSubstitution();
65	}
66	}
67
68	class MemberIterator {
69	public:
70	virtual ~MemberIterator() {}
71
72	/// walks the current object using the given designators as a guide
73	virtual void setPosition( std::list< Expression * > & designators ) = 0;
74
75	/// retrieve the list of possible Type/Designation pairs for the current position in the currect object
76	virtual std::list<InitAlternative> operator*() const = 0;
77
78	/// true if the iterator is not currently at the end
79	virtual operator bool() const = 0;
80
81	/// moves the iterator by one member in the current object
82	virtual MemberIterator & bigStep() = 0;
83
84	/// moves the iterator by one member in the current subobject
85	virtual MemberIterator & smallStep() = 0;
86
87	/// the type of the current object
88	virtual Type * getType() = 0;
89
90	/// the type of the current subobject
91	virtual Type * getNext() = 0;
92
93	/// printing for debug
94	virtual void print( std::ostream & out, Indenter indent ) const = 0;
95
96	/// helper for operator*; aggregates must add designator to each init alternative, but
97	/// adding designators in operator* creates duplicates.
98	virtual std::list<InitAlternative> first() const = 0; // should be protected
99	};
100
101	std::ostream & operator<<(std::ostream & out, const MemberIterator & it) {
102	Indenter indenter;
103	it.print( out, indenter );
104	return out;
105	}
106
107	/// create a new MemberIterator that traverses a type correctly
108	MemberIterator * createMemberIterator( Type * type );
109
110	/// iterates "other" types, e.g. basic types, pointer types, etc. which do not change at list initializer entry
111	class SimpleIterator : public MemberIterator {
112	public:
113	SimpleIterator( Type * type ) : type( type ) {}
114
115	virtual void setPosition( std::list< Expression * > & designators ) {
116	assertf( designators.empty(), "simple iterator given non-empty designator..." ); // xxx - might be semantic error
117	}
118
119	virtual std::list<InitAlternative> operator*() const { return first(); }
120	virtual operator bool() const { return type; }
121
122	// big step is the same as small step
123	virtual MemberIterator & bigStep() { return smallStep(); }
124	virtual MemberIterator & smallStep() {
125	type = nullptr; // type is nullified on increment since SimpleIterators do not have members
126	return *this;
127	}
128
129	virtual void print( std::ostream & out, __attribute__((unused)) Indenter indent ) const {
130	out << "SimpleIterator(" << type << ")";
131	}
132
133	virtual Type * getType() { return type; }
134	virtual Type * getNext() { return type; }
135
136	protected:
137	virtual std::list<InitAlternative> first() const {
138	if ( type ) return std::list<InitAlternative>{ { type->clone(), new Designation( {} ) } };
139	else return std::list<InitAlternative>{};
140	}
141	private:
142	Type * type = nullptr;
143	};
144
145	class ArrayIterator : public MemberIterator {
146	public:
147	ArrayIterator( ArrayType * at ) : array( at ) {
148	PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
149	base = at->base;
150	memberIter = createMemberIterator( base );
151	if ( at->isVarLen ) SemanticError( at, "VLA initialization does not support @=: " );
152	setSize( at->dimension );
153	}
154
155	~ArrayIterator() {
156	delete memberIter;
157	}
158
159	private:
160	void setSize( Expression * expr ) {
161	auto res = eval( expr );
162	if (res.second) {
163	size = res.first;
164	} else {
165	SemanticError( expr->location, toString("Array designator must be a constant expression: ", expr) );
166	}
167	}
168
169	public:
170	void setPosition( Expression * expr ) {
171	// need to permit integer-constant-expressions, including: integer constants, enumeration constants, character constants, sizeof expressions, _Alignof expressions, cast expressions
172	auto arg = eval( expr );
173	index = arg.first;
174	return;
175
176	// if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
177	// try {
178	// index = constExpr->intValue();
179	// } catch( SemanticErrorException & ) {
180	// SemanticError( expr, "Constant expression of non-integral type in array designator: " );
181	// }
182	// } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
183	// setPosition( castExpr->get_arg() );
184	// } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
185	// EnumInstType * inst = dynamic_cast<EnumInstType *>( varExpr->get_result() );
186	// assertf( inst, "ArrayIterator given variable that isn't an enum constant : %s", toString( expr ).c_str() );
187	// long long int value;
188	// if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {
189	// index = value;
190	// }
191	// } else if ( dynamic_cast< SizeofExpr * >( expr ) \|\| dynamic_cast< AlignofExpr * >( expr ) ) {
192	// index = 0; // xxx - get actual sizeof/alignof value?
193	// } else {
194	// assertf( false, "4 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
195	// }
196	}
197
198	virtual void setPosition( std::list< Expression * > & designators ) {
199	if ( ! designators.empty() ) {
200	setPosition( designators.front() );
201	designators.pop_front();
202	memberIter->setPosition( designators );
203	}
204	}
205
206	virtual std::list<InitAlternative> operator*() const {
207	return first();
208	}
209
210	virtual operator bool() const { return index < size; }
211
212	virtual MemberIterator & bigStep() {
213	PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
214	++index;
215	delete memberIter;
216	if ( index < size ) memberIter = createMemberIterator( base );
217	else memberIter = nullptr;
218	return *this;
219	}
220
221	virtual MemberIterator & smallStep() {
222	PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
223	if ( memberIter ) {
224	PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
225	memberIter->smallStep();
226	if ( *memberIter ) {
227	PRINT( std::cerr << "has valid member iter" << std::endl; )
228	return *this;
229	}
230	}
231	return bigStep();
232	}
233
234	virtual Type * getType() { return array; }
235	virtual Type * getNext() { return base; }
236
237	virtual std::list<InitAlternative> first() const {
238	PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
239	if ( memberIter && *memberIter ) {
240	std::list<InitAlternative> ret = memberIter->first();
241	for ( InitAlternative & alt : ret ) {
242	alt.designation->get_designators().push_front( new ConstantExpr( Constant::from_ulong( index ) ) );
243	}
244	return ret;
245	}
246	return std::list<InitAlternative>();
247	}
248
249	virtual void print( std::ostream & out, Indenter indent ) const {
250	out << "ArrayIterator(Array of " << base << ")";
251	if ( memberIter ) {
252	Indenter childIndent = indent+1;
253	out << std::endl << childIndent;
254	memberIter->print( out, childIndent );
255	}
256	}
257
258	private:
259	ArrayType * array = nullptr;
260	Type * base = nullptr;
261	size_t index = 0;
262	size_t size = 0;
263	MemberIterator * memberIter = nullptr;
264	};
265
266	class AggregateIterator : public MemberIterator {
267	public:
268	typedef std::list<Declaration *> MemberList;
269	typedef MemberList::const_iterator iterator;
270	std::string kind = ""; // for debug
271	std::string name;
272	Type * inst = nullptr;
273	const MemberList & members;
274	iterator curMember;
275	bool atbegin = true; // false at first {small,big}Step -- this aggr type is only added to the possibilities at the beginning
276	Type * curType = nullptr;
277	MemberIterator * memberIter = nullptr;
278	mutable TypeSubstitution sub;
279
280	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 ) ) {
281	PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
282	init();
283	}
284
285	virtual ~AggregateIterator() {
286	delete memberIter;
287	}
288
289	bool init() {
290	PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
291	if ( curMember != members.end() ) {
292	if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( *curMember ) ) {
293	PRINT( std::cerr << "incremented to field: " << field << std::endl; )
294	curType = field->get_type();
295	memberIter = createMemberIterator( curType );
296	return true;
297	}
298	}
299	return false;
300	}
301
302	virtual std::list<InitAlternative> operator*() const {
303	if (memberIter && *memberIter) {
304	std::list<InitAlternative> ret = memberIter->first();
305	PRINT( std::cerr << "sub: " << sub << std::endl; )
306	for ( InitAlternative & alt : ret ) {
307	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
308	alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
309	// need to substitute for generic types, so that casts are to concrete types
310	PRINT( std::cerr << " type is: " << alt.type; )
311	sub.apply( alt.type ); // also apply to designation??
312	PRINT( std::cerr << " ==> " << alt.type << std::endl; )
313	}
314	return ret;
315	}
316	return std::list<InitAlternative>();
317	}
318
319	virtual void setPosition( std::list< Expression * > & designators ) {
320	if ( ! designators.empty() ) {
321	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( designators.front() ) ) {
322	for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
323	if ( *curMember == varExpr->get_var() ) {
324	designators.pop_front();
325	delete memberIter;
326	memberIter = createMemberIterator( varExpr->get_result() );
327	curType = varExpr->get_result();
328	atbegin = curMember == members.begin() && designators.empty(); // xxx - is this the right condition for atbegin??
329	memberIter->setPosition( designators );
330	return;
331	} // if
332	} // for
333	assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
334	} else {
335	assertf( false, "3 bad designator given to %s: %s", kind.c_str(), toString( designators.front() ).c_str() );
336	} // if
337	} // if
338	}
339
340	virtual MemberIterator & smallStep() {
341	PRINT( std::cerr << "smallStep in " << kind << std::endl; )
342	atbegin = false;
343	if ( memberIter ) {
344	PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
345	memberIter->smallStep();
346	if ( *memberIter ) {
347	PRINT( std::cerr << "success!" << std::endl; )
348	return *this;
349	}
350	}
351	return bigStep();
352	}
353
354	virtual Type * getType() { return inst; }
355	virtual Type * getNext() {
356	if ( memberIter && *memberIter ) return memberIter->getType(); // xxx - ??? recursive call???
357	return nullptr;
358	}
359
360	virtual std::list<InitAlternative> first() const {
361	std::list<InitAlternative> ret;
362	PRINT( std::cerr << "first " << kind << std::endl; )
363	if ( memberIter && memberIter ) { // might not need memberIter??
364	PRINT( std::cerr << "adding children" << std::endl; )
365	ret = memberIter->first();
366	for ( InitAlternative & alt : ret ) {
367	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
368	alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
369	}
370	}
371	if ( atbegin ) {
372	// xxx - what about case of empty struct??
373	// only add self if at the very beginning of the structure
374	PRINT( std::cerr << "adding self" << std::endl; )
375	ret.push_front( { inst->clone(), new Designation( {} ) } );
376	}
377	return ret;
378	}
379
380	virtual void print( std::ostream & out, Indenter indent ) const {
381	out << kind << "(" << name << ")";
382	if ( memberIter ) {
383	Indenter childIndent = indent+1;
384	out << std::endl << childIndent;
385	memberIter->print( out, childIndent );
386	}
387	}
388	};
389
390	class UnionIterator : public AggregateIterator {
391	public:
392	UnionIterator( UnionInstType * inst ) : AggregateIterator( "UnionIterator", inst->get_name(), inst, inst->get_baseUnion()->get_members() ) {}
393
394	virtual operator bool() const { return (memberIter && *memberIter); }
395	virtual MemberIterator & bigStep() {
396	// unions only initialize one member
397	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
398	atbegin = false;
399	delete memberIter;
400	memberIter = nullptr;
401	curType = nullptr;
402	curMember = members.end();
403	return *this;
404	}
405	};
406
407	class StructIterator : public AggregateIterator {
408	public:
409	StructIterator( StructInstType * inst ) : AggregateIterator( "StructIterator", inst->get_name(), inst, inst->get_baseStruct()->get_members() ) {}
410
411	virtual operator bool() const { return curMember != members.end() \|\| (memberIter && *memberIter); }
412
413	virtual MemberIterator & bigStep() {
414	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
415	atbegin = false;
416	delete memberIter;
417	memberIter = nullptr;
418	curType = nullptr;
419	for ( ; curMember != members.end(); ) {
420	++curMember;
421	if ( init() ) {
422	return *this;
423	}
424	}
425	return *this;
426	}
427	};
428
429	class TupleIterator : public AggregateIterator {
430	public:
431	TupleIterator( TupleType * inst ) : AggregateIterator( "TupleIterator", toString("Tuple", inst->size()), inst, inst->get_members() ) {}
432
433	virtual operator bool() const { return curMember != members.end() \|\| (memberIter && *memberIter); }
434
435	virtual MemberIterator & bigStep() {
436	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
437	atbegin = false;
438	delete memberIter;
439	memberIter = nullptr;
440	curType = nullptr;
441	for ( ; curMember != members.end(); ) {
442	++curMember;
443	if ( init() ) {
444	return *this;
445	}
446	}
447	return *this;
448	}
449	};
450
451	MemberIterator * createMemberIterator( Type * type ) {
452	if ( ReferenceToType * aggr = dynamic_cast< ReferenceToType * >( type ) ) {
453	if ( StructInstType * sit = dynamic_cast< StructInstType * >( aggr ) ) {
454	return new StructIterator( sit );
455	} else if ( UnionInstType * uit = dynamic_cast< UnionInstType * >( aggr ) ) {
456	return new UnionIterator( uit );
457	} else {
458	assertf( dynamic_cast< EnumInstType * >( type ) \|\| dynamic_cast< TypeInstType * >( type ), "Encountered unhandled ReferenceToType in createMemberIterator: %s", toString( type ).c_str() );
459	return new SimpleIterator( type );
460	}
461	} else if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
462	return new ArrayIterator( at );
463	} else if ( TupleType * tt = dynamic_cast< TupleType * >( type ) ) {
464	return new TupleIterator( tt );
465	} else {
466	return new SimpleIterator( type );
467	}
468	}
469
470	CurrentObject::CurrentObject() {}
471	CurrentObject::CurrentObject( Type * type ) {
472	objStack.push( new SimpleIterator( type ) );
473	}
474
475
476	void CurrentObject::setNext( Designation * designation ) {
477	assertf( ! objStack.empty(), "obj stack empty in setNext" );
478	PRINT( std::cerr << "____setNext" << designation << std::endl; )
479	objStack.top()->setPosition( designation->get_designators() );
480	}
481
482	Designation * CurrentObject::findNext( Designation * designation ) {
483	typedef std::list< Expression * > DesignatorChain;
484	PRINT( std::cerr << "___findNext" << std::endl; )
485	// find all the d's
486	std::list<DesignatorChain> desigAlts{ { } }, newDesigAlts;
487	std::list<Type *> curTypes { (objStack.top())->getType() }, newTypes;
488	for ( Expression * expr : designation->get_designators() ) {
489	PRINT( std::cerr << "____untyped: " << expr << std::endl; )
490	std::list<DesignatorChain>::iterator dit = desigAlts.begin();
491	if ( NameExpr * nexpr = dynamic_cast<NameExpr *>(expr) ) {
492	for ( Type * t : curTypes ) {
493	assert( dit != desigAlts.end() );
494	DesignatorChain & d = *dit;
495	PRINT( std::cerr << "____actual: " << t << std::endl; )
496	ReferenceToType * refType = dynamic_cast<ReferenceToType *>(t);
497	std::list<Declaration *> members;
498	if ( refType ) {
499	refType->lookup( nexpr->get_name(), members ); // concatenate identical field name
500	// xxx - need to also include anonymous members in this somehow...
501	for ( Declaration * mem: members ) {
502	if ( ObjectDecl * field = dynamic_cast<ObjectDecl *>(mem) ) {
503	PRINT( std::cerr << "____alt: " << field->get_type() << std::endl; )
504	DesignatorChain newD = d;
505	newD.push_back( new VariableExpr( field ) );
506	newDesigAlts.push_back( newD );
507	newTypes.push_back( field->get_type() );
508	} // if
509	} // for
510	} // if
511	++dit;
512	} // for
513	} else {
514	for ( Type * t : curTypes ) {
515	assert( dit != desigAlts.end() );
516	DesignatorChain & d = *dit;
517	if ( ArrayType * at = dynamic_cast< ArrayType * > ( t ) ) {
518	PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
519	d.push_back( expr );
520	newDesigAlts.push_back( d );
521	newTypes.push_back( at->get_base() );
522	}
523	++dit;
524	} // for
525	} // if
526	desigAlts = newDesigAlts;
527	newDesigAlts.clear();
528	curTypes = newTypes;
529	newTypes.clear();
530	assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
531	} // for
532	if ( desigAlts.size() > 1 ) {
533	SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
534	} else if ( desigAlts.size() == 0 ) {
535	SemanticError( designation, "No reasonable alternatives for designation: " );
536	}
537	DesignatorChain & d = desigAlts.back();
538	PRINT( for ( Expression * expr : d ) {
539	std::cerr << "____desig: " << expr << std::endl;
540	} ) // for
541	assertf( ! curTypes.empty(), "empty designator chosen");
542
543	// set new designators
544	assertf( ! objStack.empty(), "empty object stack when setting designation" );
545	Designation * actualDesignation = new Designation( d );
546	objStack.top()->setPosition( d ); // destroys d
547	return actualDesignation;
548	}
549
550	void CurrentObject::increment() {
551	PRINT( std::cerr << "____increment" << std::endl; )
552	if ( ! objStack.empty() ) {
553	PRINT( std::cerr << *objStack.top() << std::endl; )
554	objStack.top()->smallStep();
555	}
556	}
557
558	void CurrentObject::enterListInit() {
559	PRINT( std::cerr << "____entering list init" << std::endl; )
560	assertf( ! objStack.empty(), "empty obj stack entering list init" );
561	Type * type = objStack.top()->getNext();
562	if ( type ) {
563	objStack.push( createMemberIterator( type ) );
564	} else {
565	assertf( false, "not sure about this case..." );
566	}
567	}
568
569	void CurrentObject::exitListInit() {
570	PRINT( std::cerr << "____exiting list init" << std::endl; )
571	assertf( ! objStack.empty(), "objstack empty" );
572	delete objStack.top();
573	objStack.pop();
574	if ( ! objStack.empty() ) {
575	PRINT( std::cerr << *objStack.top() << std::endl; )
576	objStack.top()->bigStep();
577	}
578	}
579
580	std::list< InitAlternative > CurrentObject::getOptions() {
581	PRINT( std::cerr << "____getting current options" << std::endl; )
582	assertf( ! objStack.empty(), "objstack empty in getOptions" );
583	return **objStack.top();
584	}
585
586	Type * CurrentObject::getCurrentType() {
587	PRINT( std::cerr << "____getting current type" << std::endl; )
588	assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
589	return objStack.top()->getNext();
590	}
591	} // namespace ResolvExpr
592
593	namespace ast {
594	/// create a new MemberIterator that traverses a type correctly
595	MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type );
596
597	/// Iterates "other" types (e.g. basic, pointer) which do not change at list initializer entry
598	class SimpleIterator final : public MemberIterator {
599	CodeLocation location;
600	const Type * type = nullptr;
601	public:
602	SimpleIterator( const CodeLocation & loc, const Type * t ) : location( loc ), type( t ) {}
603
604	void setPosition(
605	std::deque< ptr< Expr > >::const_iterator begin,
606	std::deque< ptr< Expr > >::const_iterator end
607	) override {
608	if ( begin != end ) {
609	SemanticError( location, "Un-designated initializer given non-empty designator" );
610	}
611	}
612
613	std::deque< InitAlternative > operator* () const override { return first(); }
614
615	operator bool() const override { return type; }
616
617	SimpleIterator & bigStep() override { return smallStep(); }
618	SimpleIterator & smallStep() override {
619	type = nullptr; // empty on increment because no members
620	return *this;
621	}
622
623	const Type * getType() override { return type; }
624
625	const Type * getNext() override { return type; }
626
627	std::deque< InitAlternative > first() const override {
628	if ( type ) return { InitAlternative{ type, new Designation{ location } } };
629	return {};
630	}
631	};
632
633	/// Iterates array types
634	class ArrayIterator final : public MemberIterator {
635	CodeLocation location;
636	const ArrayType * array = nullptr;
637	const Type * base = nullptr;
638	size_t index = 0;
639	size_t size = 0;
640	std::unique_ptr< MemberIterator > memberIter;
641
642	void setSize( const Expr * expr ) {
643	auto res = eval( expr );
644	if ( ! res.second ) {
645	SemanticError( location, toString( "Array designator must be a constant expression: ", expr ) );
646	}
647	size = res.first;
648	}
649
650	public:
651	ArrayIterator( const CodeLocation & loc, const ArrayType * at ) : location( loc ), array( at ), base( at->base ) {
652	PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
653	memberIter.reset( createMemberIterator( loc, base ) );
654	if ( at->isVarLen ) {
655	SemanticError( location, at, "VLA initialization does not support @=: " );
656	}
657	setSize( at->dimension );
658	}
659
660	void setPosition( const Expr * expr ) {
661	// need to permit integer-constant-expressions, including: integer constants,
662	// enumeration constants, character constants, sizeof expressions, alignof expressions,
663	// cast expressions
664
665	auto arg = eval( expr );
666	index = arg.first;
667	return;
668
669	// if ( auto constExpr = dynamic_cast< const ConstantExpr * >( expr ) ) {
670	// try {
671	// index = constExpr->intValue();
672	// } catch ( SemanticErrorException & ) {
673	// SemanticError( expr, "Constant expression of non-integral type in array designator: " );
674	// }
675	// } else if ( auto castExpr = dynamic_cast< const CastExpr * >( expr ) ) {
676	// setPosition( castExpr->arg );
677	// } else if ( dynamic_cast< const SizeofExpr * >( expr ) \|\| dynamic_cast< const AlignofExpr * >( expr ) ) {
678	// index = 0;
679	// } else {
680	// assertf( false, "2 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
681	// }
682	}
683
684	void setPosition(
685	std::deque< ptr< Expr > >::const_iterator begin,
686	std::deque< ptr< Expr > >::const_iterator end
687	) override {
688	if ( begin == end ) return;
689
690	setPosition( *begin );
691	memberIter->setPosition( ++begin, end );
692	}
693
694	std::deque< InitAlternative > operator* () const override { return first(); }
695
696	operator bool() const override { return index < size; }
697
698	ArrayIterator & bigStep() override {
699	PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
700	++index;
701	memberIter.reset( index < size ? createMemberIterator( location, base ) : nullptr );
702	return *this;
703	}
704
705	ArrayIterator & smallStep() override {
706	PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
707	if ( memberIter ) {
708	PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
709	memberIter->smallStep();
710	if ( *memberIter ) {
711	PRINT( std::cerr << "has valid member iter" << std::endl; )
712	return *this;
713	}
714	}
715	return bigStep();
716	}
717
718	const Type * getType() override { return array; }
719
720	const Type * getNext() override { return base; }
721
722	std::deque< InitAlternative > first() const override {
723	PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
724	if ( memberIter && *memberIter ) {
725	std::deque< InitAlternative > ret = memberIter->first();
726	for ( InitAlternative & alt : ret ) {
727	alt.designation.get_and_mutate()->designators.emplace_front( ConstantExpr::from_ulong( location, index ) );
728	}
729	return ret;
730	}
731	return {};
732	}
733	};
734
735	class AggregateIterator : public MemberIterator {
736	protected:
737	using MemberList = std::vector< ptr< Decl > >;
738
739	CodeLocation location;
740	std::string kind; // for debug
741	std::string name;
742	const Type * inst;
743	const MemberList & members;
744	MemberList::const_iterator curMember;
745	bool atbegin = true; // false at first {small,big}Step
746	const Type * curType = nullptr;
747	std::unique_ptr< MemberIterator > memberIter = nullptr;
748	TypeSubstitution sub;
749
750	bool init() {
751	PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
752	if ( curMember != members.end() ) {
753	if ( auto field = curMember->as< ObjectDecl >() ) {
754	PRINT( std::cerr << "incremented to field: " << field << std::endl; )
755	curType = field->get_type();
756	memberIter.reset( createMemberIterator( location, curType ) );
757	return true;
758	}
759	}
760	return false;
761	}
762
763	AggregateIterator(
764	const CodeLocation & loc, const std::string k, const std::string & n, const Type * i,
765	const MemberList & ms )
766	: location( loc ), kind( k ), name( n ), inst( i ), members( ms ), curMember( ms.begin() ),
767	sub( genericSubstitution( i ) ) {
768	PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
769	init();
770	}
771
772	public:
773	void setPosition(
774	std::deque< ptr< Expr > >::const_iterator begin,
775	std::deque< ptr< Expr > >::const_iterator end
776	) final {
777	if ( begin == end ) return;
778
779	if ( auto varExpr = begin->as< VariableExpr >() ) {
780	for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
781	if ( *curMember != varExpr->var ) continue;
782
783	++begin;
784
785	memberIter.reset( createMemberIterator( location, varExpr->result ) );
786	curType = varExpr->result;
787	atbegin = curMember == members.begin() && begin == end;
788	memberIter->setPosition( begin, end );
789	return;
790	}
791	assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
792	} else {
793	assertf( false, "1 bad designator given to %s: %s", kind.c_str(), toString( *begin ).c_str() );
794	}
795	}
796
797	std::deque< InitAlternative > operator* () const final {
798	if ( memberIter && *memberIter ) {
799	std::deque< InitAlternative > ret = memberIter->first();
800	PRINT( std::cerr << "sub: " << sub << std::endl; )
801	for ( InitAlternative & alt : ret ) {
802	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
803	alt.designation.get_and_mutate()->designators.emplace_front(
804	new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
805	// need to substitute for generic types so that casts are to concrete types
806	alt.type = shallowCopy(alt.type.get());
807	PRINT( std::cerr << " type is: " << alt.type; )
808	sub.apply( alt.type ); // also apply to designation??
809	PRINT( std::cerr << " ==> " << alt.type << std::endl; )
810	}
811	return ret;
812	}
813	return {};
814	}
815
816	AggregateIterator & smallStep() final {
817	PRINT( std::cerr << "smallStep in " << kind << std::endl; )
818	atbegin = false;
819	if ( memberIter ) {
820	PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
821	memberIter->smallStep();
822	if ( *memberIter ) {
823	PRINT( std::cerr << "success!" << std::endl; )
824	return *this;
825	}
826	}
827	return bigStep();
828	}
829
830	AggregateIterator & bigStep() override = 0;
831
832	const Type * getType() final { return inst; }
833
834	const Type * getNext() final {
835	return ( memberIter && *memberIter ) ? memberIter->getType() : nullptr;
836	}
837
838	std::deque< InitAlternative > first() const final {
839	std::deque< InitAlternative > ret;
840	PRINT( std::cerr << "first " << kind << std::endl; )
841	if ( memberIter && *memberIter ) {
842	PRINT( std::cerr << "adding children" << std::endl; )
843	ret = memberIter->first();
844	for ( InitAlternative & alt : ret ) {
845	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
846	alt.designation.get_and_mutate()->designators.emplace_front(
847	new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
848	}
849	}
850	if ( atbegin ) {
851	// only add self if at the very beginning of the structure
852	PRINT( std::cerr << "adding self" << std::endl; )
853	ret.emplace_front( inst, new Designation{ location } );
854	}
855	return ret;
856	}
857	};
858
859	class StructIterator final : public AggregateIterator {
860	public:
861	StructIterator( const CodeLocation & loc, const StructInstType * inst )
862	: AggregateIterator( loc, "StructIterator", inst->name, inst, inst->base->members ) {}
863
864	operator bool() const override {
865	return curMember != members.end() \|\| (memberIter && *memberIter);
866	}
867
868	StructIterator & bigStep() override {
869	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
870	atbegin = false;
871	memberIter = nullptr;
872	curType = nullptr;
873	while ( curMember != members.end() ) {
874	++curMember;
875	if ( init() ) return *this;
876	}
877	return *this;
878	}
879	};
880
881	class UnionIterator final : public AggregateIterator {
882	public:
883	UnionIterator( const CodeLocation & loc, const UnionInstType * inst )
884	: AggregateIterator( loc, "UnionIterator", inst->name, inst, inst->base->members ) {}
885
886	operator bool() const override { return memberIter && *memberIter; }
887
888	UnionIterator & bigStep() override {
889	// unions only initialize one member
890	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
891	atbegin = false;
892	memberIter = nullptr;
893	curType = nullptr;
894	curMember = members.end();
895	return *this;
896	}
897	};
898
899	class TupleIterator final : public AggregateIterator {
900	public:
901	TupleIterator( const CodeLocation & loc, const TupleType * inst )
902	: AggregateIterator(
903	loc, "TupleIterator", toString("Tuple", inst->size()), inst, inst->members
904	) {}
905
906	operator bool() const override {
907	return curMember != members.end() \|\| (memberIter && *memberIter);
908	}
909
910	TupleIterator & bigStep() override {
911	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
912	atbegin = false;
913	memberIter = nullptr;
914	curType = nullptr;
915	while ( curMember != members.end() ) {
916	++curMember;
917	if ( init() ) return *this;
918	}
919	return *this;
920	}
921	};
922
923	MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type ) {
924	if ( auto aggr = dynamic_cast< const BaseInstType * >( type ) ) {
925	if ( auto sit = dynamic_cast< const StructInstType * >( aggr ) ) {
926	assert( sit->base );
927	return new StructIterator{ loc, sit };
928	} else if ( auto uit = dynamic_cast< const UnionInstType * >( aggr ) ) {
929	assert( uit->base );
930	return new UnionIterator{ loc, uit };
931	} else {
932	assertf(
933	dynamic_cast< const EnumInstType * >( type )
934	\|\| dynamic_cast< const TypeInstType * >( type ),
935	"Encountered unhandled BaseInstType in createMemberIterator: %s",
936	toString( type ).c_str() );
937	return new SimpleIterator{ loc, type };
938	}
939	} else if ( auto at = dynamic_cast< const ArrayType * >( type ) ) {
940	return new ArrayIterator{ loc, at };
941	} else if ( auto tt = dynamic_cast< const TupleType * >( type ) ) {
942	return new TupleIterator{ loc, tt };
943	} else {
944	return new SimpleIterator{ loc, type };
945	}
946	}
947
948	CurrentObject::CurrentObject( const CodeLocation & loc, const Type * type ) : objStack() {
949	objStack.emplace_back( new SimpleIterator{ loc, type } );
950	}
951
952	const Designation * CurrentObject::findNext( const Designation * designation ) {
953	using DesignatorChain = std::deque< ptr< Expr > >;
954	PRINT( std::cerr << "___findNext" << std::endl; )
955
956	// find all the d's
957	std::vector< DesignatorChain > desigAlts{ {} }, newDesigAlts;
958	std::deque< const Type * > curTypes{ objStack.back()->getType() }, newTypes;
959	for ( const Expr * expr : designation->designators ) {
960	PRINT( std::cerr << "____untyped: " << expr << std::endl; )
961	auto dit = desigAlts.begin();
962	if ( auto nexpr = dynamic_cast< const NameExpr * >( expr ) ) {
963	for ( const Type * t : curTypes ) {
964	assert( dit != desigAlts.end() );
965
966	DesignatorChain & d = *dit;
967	PRINT( std::cerr << "____actual: " << t << std::endl; )
968	if ( auto refType = dynamic_cast< const BaseInstType * >( t ) ) {
969	// concatenate identical field names
970	for ( const Decl * mem : refType->lookup( nexpr->name ) ) {
971	if ( auto field = dynamic_cast< const ObjectDecl * >( mem ) ) {
972	PRINT( std::cerr << "____alt: " << field->type << std::endl; )
973	DesignatorChain d2 = d;
974	d2.emplace_back( new VariableExpr{ expr->location, field } );
975	newDesigAlts.emplace_back( std::move( d2 ) );
976	newTypes.emplace_back( field->type );
977	}
978	}
979	}
980
981	++dit;
982	}
983	} else {
984	for ( const Type * t : curTypes ) {
985	assert( dit != desigAlts.end() );
986
987	DesignatorChain & d = *dit;
988	if ( auto at = dynamic_cast< const ArrayType * >( t ) ) {
989	PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
990	d.emplace_back( expr );
991	newDesigAlts.emplace_back( d );
992	newTypes.emplace_back( at->base );
993	}
994	}
995	}
996
997	// reset queue
998	desigAlts = std::move( newDesigAlts );
999	newDesigAlts.clear();
1000	curTypes = std::move( newTypes );
1001	newTypes.clear();
1002	assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
1003	}
1004
1005	if ( desigAlts.size() > 1 ) {
1006	SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
1007	} else if ( desigAlts.empty() ) {
1008	SemanticError( designation, "No reasonable alternatives for designation: " );
1009	}
1010
1011	DesignatorChain & d = desigAlts.back();
1012	PRINT( for ( Expression * expr : d ) {
1013	std::cerr << "____desig: " << expr << std::endl;
1014	} ) // for
1015	assertf( ! curTypes.empty(), "empty designator chosen");
1016
1017	// set new designators
1018	assertf( ! objStack.empty(), "empty object stack when setting designation" );
1019	Designation * actualDesignation =
1020	new Designation{ designation->location, DesignatorChain{d} };
1021	objStack.back()->setPosition( d ); // destroys d
1022	return actualDesignation;
1023	}
1024
1025	void CurrentObject::setNext( const Designation * designation ) {
1026	PRINT( std::cerr << "____setNext" << designation << std::endl; )
1027	assertf( ! objStack.empty(), "obj stack empty in setNext" );
1028	objStack.back()->setPosition( designation->designators );
1029	}
1030
1031	void CurrentObject::increment() {
1032	PRINT( std::cerr << "____increment" << std::endl; )
1033	if ( objStack.empty() ) return;
1034	PRINT( std::cerr << *objStack.back() << std::endl; )
1035	objStack.back()->smallStep();
1036	}
1037
1038	void CurrentObject::enterListInit( const CodeLocation & loc ) {
1039	PRINT( std::cerr << "____entering list init" << std::endl; )
1040	assertf( ! objStack.empty(), "empty obj stack entering list init" );
1041	const ast::Type * type = objStack.back()->getNext();
1042	assert( type );
1043	objStack.emplace_back( createMemberIterator( loc, type ) );
1044	}
1045
1046	void CurrentObject::exitListInit() {
1047	PRINT( std::cerr << "____exiting list init" << std::endl; )
1048	assertf( ! objStack.empty(), "objstack empty" );
1049	objStack.pop_back();
1050	if ( ! objStack.empty() ) {
1051	PRINT( std::cerr << *objStack.back() << std::endl; )
1052	objStack.back()->bigStep();
1053	}
1054	}
1055
1056	std::deque< InitAlternative > CurrentObject::getOptions() {
1057	PRINT( std::cerr << "____getting current options" << std::endl; )
1058	assertf( ! objStack.empty(), "objstack empty in getOptions" );
1059	return **objStack.back();
1060	}
1061
1062	const Type * CurrentObject::getCurrentType() {
1063	PRINT( std::cerr << "____getting current type" << std::endl; )
1064	assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
1065	return objStack.back()->getNext();
1066	}
1067	}
1068
1069	// Local Variables: //
1070	// tab-width: 4 //
1071	// mode: c++ //
1072	// compile-command: "make install" //
1073	// End: //

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