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source: src/ResolvExpr/CurrentObject.cc @ 98278b3a

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Last change on this file since 98278b3a was a16764a6, checked in by Thierry Delisle <tdelisle@…>, 7 years ago
Changed warning system to prepare for toggling warnings
Property mode set to `100644`
File size: 21.4 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 : Rob Schluntz
12	// Last Modified On : Tue Jun 13 15:28:44 2017
13	// Update Count : 2
14	//
15
16	#include <stddef.h> // for size_t
17	#include <cassert> // for assertf, assert, safe_dynamic_...
18	#include <iostream> // for ostream, operator<<, basic_ost...
19	#include <stack> // for stack
20	#include <string> // for string, operator<<, allocator
21
22	#include "Common/Indenter.h" // for Indenter, operator<<
23	#include "Common/SemanticError.h" // for SemanticError
24	#include "Common/utility.h" // for toString
25	#include "CurrentObject.h"
26	#include "SynTree/Constant.h" // for Constant
27	#include "SynTree/Declaration.h" // for ObjectDecl, Declaration, Struc...
28	#include "SynTree/Expression.h" // for InitAlternative, VariableExpr
29	#include "SynTree/Initializer.h" // for Designation, operator<<
30	#include "SynTree/Type.h" // for Type, StructInstType, UnionIns...
31	#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
32
33	#if 0
34	#define PRINT(x) x
35	#else
36	#define PRINT(x)
37	#endif
38
39	namespace ResolvExpr {
40	template< typename AggrInst >
41	TypeSubstitution makeGenericSubstitution( AggrInst * inst ) {
42	assert( inst );
43	assert( inst->get_baseParameters() );
44	std::list< TypeDecl * > baseParams = *inst->get_baseParameters();
45	std::list< Expression * > typeSubs = inst->get_parameters();
46	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
47	return subs;
48	}
49
50	TypeSubstitution makeGenericSubstitution( Type * type ) {
51	if ( StructInstType * inst = dynamic_cast< StructInstType * >( type ) ) {
52	return makeGenericSubstitution( inst );
53	} else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( type ) ) {
54	return makeGenericSubstitution( inst );
55	} else {
56	return TypeSubstitution();
57	}
58	}
59
60	class MemberIterator {
61	public:
62	virtual ~MemberIterator() {}
63
64	/// walks the current object using the given designators as a guide
65	virtual void setPosition( std::list< Expression * > & designators ) = 0;
66
67	/// retrieve the list of possible Type/Designaton pairs for the current position in the currect object
68	virtual std::list<InitAlternative> operator*() const = 0;
69
70	/// true if the iterator is not currently at the end
71	virtual operator bool() const = 0;
72
73	/// moves the iterator by one member in the current object
74	virtual MemberIterator & bigStep() = 0;
75
76	/// moves the iterator by one member in the current subobject
77	virtual MemberIterator & smallStep() = 0;
78
79	/// the type of the current object
80	virtual Type * getType() = 0;
81
82	/// the type of the current subobject
83	virtual Type * getNext() = 0;
84
85	/// printing for debug
86	virtual void print( std::ostream & out, Indenter indent ) const = 0;
87
88	/// helper for operator*; aggregates must add designator to each init alternative, but
89	/// adding designators in operator* creates duplicates.
90	virtual std::list<InitAlternative> first() const = 0; // should be protected
91	};
92
93	std::ostream & operator<<(std::ostream & out, const MemberIterator & it) {
94	Indenter indenter;
95	it.print( out, indenter );
96	return out;
97	}
98
99	/// create a new MemberIterator that traverses a type correctly
100	MemberIterator * createMemberIterator( Type * type );
101
102	/// iterates "other" types, e.g. basic types, pointer types, etc. which do not change at list initializer entry
103	class SimpleIterator : public MemberIterator {
104	public:
105	SimpleIterator( Type * type ) : type( type ) {}
106
107	virtual void setPosition( std::list< Expression * > & designators ) {
108	assertf( designators.empty(), "simple iterator given non-empty designator..." ); // xxx - might be semantic error
109	}
110
111	virtual std::list<InitAlternative> operator*() const { return first(); }
112	virtual operator bool() const { return type; }
113
114	// big step is the same as small step
115	virtual MemberIterator & bigStep() { return smallStep(); }
116	virtual MemberIterator & smallStep() {
117	type = nullptr; // type is nullified on increment since SimpleIterators do not have members
118	return *this;
119	}
120
121	virtual void print( std::ostream & out, __attribute__((unused)) Indenter indent ) const {
122	out << "SimpleIterator(" << type << ")";
123	}
124
125	virtual Type * getType() { return type; }
126	virtual Type * getNext() { return type; }
127
128	protected:
129	virtual std::list<InitAlternative> first() const {
130	if ( type ) return std::list<InitAlternative>{ { type->clone(), new Designation( {} ) } };
131	else return std::list<InitAlternative>{};
132	}
133	private:
134	Type * type = nullptr;
135	};
136
137	class ArrayIterator : public MemberIterator {
138	public:
139	ArrayIterator( ArrayType * at ) : array( at ) {
140	PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
141	base = at->get_base();
142	memberIter = createMemberIterator( base );
143	if ( at->isVarLen ) SemanticError( at, "VLA initialization does not support @=" );
144	setSize( at->get_dimension() );
145	}
146
147	~ArrayIterator() {
148	delete memberIter;
149	}
150
151	private:
152	void setSize( Expression * expr ) {
153	if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
154	try {
155	size = constExpr->intValue();
156	PRINT( std::cerr << "array type with size: " << size << std::endl; )
157	} catch ( SemanticErrorException & ) {
158	SemanticError( expr, "Constant expression of non-integral type in array dimension: " );
159	}
160	} else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
161	setSize( castExpr->get_arg() ); // xxx - need to perform the conversion specified by the cast
162	} else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
163	if ( EnumInstType * inst = dynamic_cast< EnumInstType * > ( varExpr->result ) ) {
164	long long int value;
165	if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {
166	size = value;
167	}
168	}
169	} else {
170	assertf( false, "unhandled expression in setSize: %s", toString( expr ).c_str() ); // xxx - if not a constant expression, it's not simple to determine how long the array actually is, which is necessary for initialization to be done correctly -- fix this
171	}
172	}
173
174	public:
175	void setPosition( Expression * expr ) {
176	// need to permit integer-constant-expressions, including: integer constants, enumeration constants, character constants, sizeof expressions, _Alignof expressions, cast expressions
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, "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, "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	// Local Variables: //
595	// tab-width: 4 //
596	// mode: c++ //
597	// compile-command: "make install" //
598	// End: //

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