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source: src/ResolvExpr/CurrentObject.cc @ daacf82

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

Last change on this file since daacf82 was e3e16bc, checked in by Thierry Delisle <tdelisle@…>, 7 years ago
Renamed safe_dynamic_cast to strict_dynamic_cast
Property mode set to `100644`
File size: 21.0 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 : 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	long long int getConstValue( ConstantExpr * constExpr ) {
41	if ( BasicType * basicType = dynamic_cast< BasicType * >( constExpr->get_result() ) ) {
42	if ( basicType->isInteger() ) {
43	return constExpr->get_constant()->get_ival();
44	} else {
45	assertf( false, "Non-integer constant expression in getConstValue %s", toString( constExpr ).c_str() ); // xxx - might be semantic error
46	}
47	} else if ( dynamic_cast< OneType * >( constExpr->get_result() ) ) {
48	return 1;
49	} else if ( dynamic_cast< ZeroType * >( constExpr->get_result() ) ) {
50	return 0;
51	} else {
52	assertf( false, "unhandled type on getConstValue %s", toString( constExpr->get_result() ).c_str() ); // xxx - might be semantic error
53	}
54	}
55
56	template< typename AggrInst >
57	TypeSubstitution makeGenericSubstitution( AggrInst * inst ) {
58	assert( inst );
59	assert( inst->get_baseParameters() );
60	std::list< TypeDecl * > baseParams = *inst->get_baseParameters();
61	std::list< Expression * > typeSubs = inst->get_parameters();
62	TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
63	return subs;
64	}
65
66	TypeSubstitution makeGenericSubstitution( Type * type ) {
67	if ( StructInstType * inst = dynamic_cast< StructInstType * >( type ) ) {
68	return makeGenericSubstitution( inst );
69	} else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( type ) ) {
70	return makeGenericSubstitution( inst );
71	} else {
72	return TypeSubstitution();
73	}
74	}
75
76	class MemberIterator {
77	public:
78	virtual ~MemberIterator() {}
79
80	virtual void setPosition( std::list< Expression * > & designators ) = 0;
81	virtual std::list<InitAlternative> operator*() const = 0;
82	virtual operator bool() const = 0;
83	virtual MemberIterator & bigStep() = 0;
84	virtual MemberIterator & smallStep() = 0;
85	virtual Type * getType() = 0;
86	virtual Type * getNext() = 0;
87
88	virtual void print( std::ostream & out, Indenter indent ) const = 0;
89
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	setSize( at->get_dimension() );
144	}
145
146	~ArrayIterator() {
147	delete memberIter;
148	}
149
150	private:
151	void setSize( Expression * expr ) {
152	if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
153	size = getConstValue( constExpr );
154	PRINT( std::cerr << "array type with size: " << size << std::endl; )
155	} else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
156	setSize( castExpr->get_arg() ); // xxx - need to perform the conversion specified by the cast
157	} else {
158	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
159	}
160	}
161
162	public:
163	void setPosition( Expression * expr ) {
164	// need to permit integer-constant-expressions, including: integer constants, enumeration constants, character constants, sizeof expressions, _Alignof expressions, cast expressions
165	if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
166	index = getConstValue( constExpr );
167	} else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
168	setPosition( castExpr->get_arg() );
169	} else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
170	assertf( dynamic_cast<EnumInstType *> ( varExpr->get_result() ), "ArrayIterator given variable that isn't an enum constant : %s", toString( expr ).c_str() );
171	index = 0; // xxx - get actual value of enum constant
172	} else if ( dynamic_cast< SizeofExpr * >( expr ) \|\| dynamic_cast< AlignofExpr * >( expr ) ) {
173	index = 0; // xxx - get actual sizeof/alignof value?
174	} else {
175	assertf( false, "bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
176	}
177	}
178
179	virtual void setPosition( std::list< Expression * > & designators ) {
180	if ( ! designators.empty() ) {
181	setPosition( designators.front() );
182	designators.pop_front();
183	memberIter->setPosition( designators );
184	}
185	}
186
187	virtual std::list<InitAlternative> operator*() const {
188	return first();
189	}
190
191	virtual operator bool() const { return index < size; }
192
193	virtual MemberIterator & bigStep() {
194	PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
195	++index;
196	delete memberIter;
197	if ( index < size ) memberIter = createMemberIterator( base );
198	else memberIter = nullptr;
199	return *this;
200	}
201
202	virtual MemberIterator & smallStep() {
203	PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
204	if ( memberIter ) {
205	PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
206	memberIter->smallStep();
207	if ( *memberIter ) {
208	PRINT( std::cerr << "has valid member iter" << std::endl; )
209	return *this;
210	}
211	}
212	return bigStep();
213	}
214
215	virtual Type * getType() { return array; }
216	virtual Type * getNext() { return base; }
217
218	virtual std::list<InitAlternative> first() const {
219	PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
220	if ( memberIter && *memberIter ) {
221	std::list<InitAlternative> ret = memberIter->first();
222	for ( InitAlternative & alt : ret ) {
223	alt.designation->get_designators().push_front( new ConstantExpr( Constant::from_ulong( index ) ) );
224	}
225	return ret;
226	}
227	return std::list<InitAlternative>();
228	}
229
230	virtual void print( std::ostream & out, Indenter indent ) const {
231	out << "ArrayIterator(Array of " << base << ")";
232	if ( memberIter ) {
233	Indenter childIndent = indent+1;
234	out << std::endl << childIndent;
235	memberIter->print( out, childIndent );
236	}
237	}
238
239	private:
240	ArrayType * array = nullptr;
241	Type * base = nullptr;
242	size_t index = 0;
243	size_t size = 0;
244	MemberIterator * memberIter = nullptr;
245	};
246
247	class AggregateIterator : public MemberIterator {
248	public:
249	typedef std::list<Declaration *> MemberList;
250	typedef MemberList::const_iterator iterator;
251	std::string kind = ""; // for debug
252	std::string name;
253	Type * inst = nullptr;
254	const MemberList & members;
255	iterator curMember;
256	bool atbegin = true; // false at first {small,big}Step -- this aggr type is only added to the possibilities at the beginning
257	Type * curType = nullptr;
258	MemberIterator * memberIter = nullptr;
259	mutable TypeSubstitution sub;
260
261	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 ) ) {
262	init();
263	}
264
265	virtual ~AggregateIterator() {
266	delete memberIter;
267	}
268
269	bool init() {
270	PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
271	if ( curMember != members.end() ) {
272	if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( *curMember ) ) {
273	PRINT( std::cerr << "incremented to field: " << field << std::endl; )
274	curType = field->get_type();
275	memberIter = createMemberIterator( curType );
276	return true;
277	}
278	}
279	return false;
280	}
281
282	virtual std::list<InitAlternative> operator*() const {
283	if (memberIter && *memberIter) {
284	std::list<InitAlternative> ret = memberIter->first();
285	PRINT( std::cerr << "sub: " << sub << std::endl; )
286	for ( InitAlternative & alt : ret ) {
287	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
288	alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
289	// need to substitute for generic types, so that casts are to concrete types
290	PRINT( std::cerr << " type is: " << alt.type; )
291	sub.apply( alt.type ); // also apply to designation??
292	PRINT( std::cerr << " ==> " << alt.type << std::endl; )
293	}
294	return ret;
295	}
296	return std::list<InitAlternative>();
297	}
298
299	virtual void setPosition( std::list< Expression * > & designators ) {
300	if ( ! designators.empty() ) {
301	if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( designators.front() ) ) {
302	for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
303	if ( *curMember == varExpr->get_var() ) {
304	designators.pop_front();
305	delete memberIter;
306	memberIter = createMemberIterator( varExpr->get_result() );
307	curType = varExpr->get_result();
308	atbegin = curMember == members.begin() && designators.empty(); // xxx - is this the right condition for atbegin??
309	memberIter->setPosition( designators );
310	return;
311	} // if
312	} // for
313	assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
314	} else {
315	assertf( false, "bad designator given to %s: %s", kind.c_str(), toString( designators.front() ).c_str() );
316	} // if
317	} // if
318	}
319
320	virtual MemberIterator & smallStep() {
321	PRINT( std::cerr << "smallStep in " << kind << std::endl; )
322	atbegin = false;
323	if ( memberIter ) {
324	PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
325	memberIter->smallStep();
326	if ( *memberIter ) {
327	PRINT( std::cerr << "success!" << std::endl; )
328	return *this;
329	}
330	}
331	return bigStep();
332	}
333
334	virtual Type * getType() { return inst; }
335	virtual Type * getNext() {
336	if ( memberIter && *memberIter ) return memberIter->getType(); // xxx - ??? recursive call???
337	return nullptr;
338	}
339
340	virtual std::list<InitAlternative> first() const {
341	std::list<InitAlternative> ret;
342	PRINT( std::cerr << "first " << kind << std::endl; )
343	if ( memberIter && memberIter ) { // might not need memberIter??
344	PRINT( std::cerr << "adding children" << std::endl; )
345	ret = memberIter->first();
346	for ( InitAlternative & alt : ret ) {
347	PRINT( std::cerr << "iterating and adding designators" << std::endl; )
348	alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
349	}
350	}
351	// if ( curMember == std::next( decl->get_members().begin(), 1 ) ) { // xxx - this never triggers because curMember is incremented immediately on construction
352	if ( atbegin ) { // xxx - this never triggers because curMember is incremented immediately on construction
353	// xxx - what about case of empty struct??
354	// only add self if at the very beginning of the structure
355	PRINT( std::cerr << "adding self" << std::endl; )
356	ret.push_front( { inst->clone(), new Designation( {} ) } );
357	}
358	return ret;
359	}
360
361	virtual void print( std::ostream & out, Indenter indent ) const {
362	out << kind << "(" << name << ")";
363	if ( memberIter ) {
364	Indenter childIndent = indent+1;
365	out << std::endl << childIndent;
366	memberIter->print( out, childIndent );
367	}
368	}
369	};
370
371	class UnionIterator : public AggregateIterator {
372	public:
373	UnionIterator( UnionInstType * inst ) : AggregateIterator( "UnionIterator", inst->get_name(), inst, inst->get_baseUnion()->get_members() ) {}
374
375	virtual operator bool() const { return (memberIter && *memberIter); }
376	virtual MemberIterator & bigStep() {
377	// unions only initialize one member
378	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
379	atbegin = false;
380	delete memberIter;
381	memberIter = nullptr;
382	curType = nullptr;
383	curMember = members.end();
384	return *this;
385	}
386	virtual std::list<InitAlternative> first() const { return std::list<InitAlternative>{}; }
387	};
388
389	class StructIterator : public AggregateIterator {
390	public:
391	StructIterator( StructInstType * inst ) : AggregateIterator( "StructIterator", inst->get_name(), inst, inst->get_baseStruct()->get_members() ) {}
392
393	virtual operator bool() const { return curMember != members.end() \|\| (memberIter && *memberIter); }
394
395	virtual MemberIterator & bigStep() {
396	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
397	atbegin = false;
398	delete memberIter;
399	memberIter = nullptr;
400	curType = nullptr;
401	for ( ; curMember != members.end(); ) {
402	++curMember;
403	if ( init() ) {
404	return *this;
405	}
406	}
407	return *this;
408	}
409	};
410
411	class TupleIterator : public AggregateIterator {
412	public:
413	TupleIterator( TupleType * inst ) : AggregateIterator( "TupleIterator", toString("Tuple", inst->size()), inst, inst->get_members() ) {}
414
415	virtual operator bool() const { return curMember != members.end() \|\| (memberIter && *memberIter); }
416
417	virtual MemberIterator & bigStep() {
418	PRINT( std::cerr << "bigStep in " << kind << std::endl; )
419	atbegin = false;
420	delete memberIter;
421	memberIter = nullptr;
422	curType = nullptr;
423	for ( ; curMember != members.end(); ) {
424	++curMember;
425	if ( init() ) {
426	return *this;
427	}
428	}
429	return *this;
430	}
431	};
432
433	MemberIterator * createMemberIterator( Type * type ) {
434	if ( ReferenceToType * aggr = dynamic_cast< ReferenceToType * >( type ) ) {
435	if ( StructInstType * sit = dynamic_cast< StructInstType * >( aggr ) ) {
436	return new StructIterator( sit );
437	} else if ( UnionInstType * uit = dynamic_cast< UnionInstType * >( aggr ) ) {
438	return new UnionIterator( uit );
439	} else {
440	assertf( dynamic_cast< TypeInstType * >( type ), "some other reftotype" );
441	return new SimpleIterator( type );
442	}
443	} else if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
444	return new ArrayIterator( at );
445	} else if ( TupleType * tt = dynamic_cast< TupleType * >( type ) ) {
446	return new TupleIterator( tt );
447	} else {
448	return new SimpleIterator( type );
449	}
450	}
451
452	CurrentObject::CurrentObject() {}
453	CurrentObject::CurrentObject( Type * type ) {
454	objStack.push( new SimpleIterator( type ) );
455	}
456
457
458	void CurrentObject::setNext( Designation * designation ) {
459	assertf( ! objStack.empty(), "obj stack empty in setNext" );
460	PRINT( std::cerr << "____setNext" << designation << std::endl; )
461	objStack.top()->setPosition( designation->get_designators() );
462	}
463
464	Designation * CurrentObject::findNext( Designation * designation ) {
465	typedef std::list< Expression * > DesignatorChain;
466	PRINT( std::cerr << "___findNext" << std::endl; )
467	// find all the d's
468	std::list<DesignatorChain> desigAlts{ { } }, newDesigAlts;
469	std::list<Type *> curTypes { (objStack.top())->getType() }, newTypes;
470	for ( Expression * expr : designation->get_designators() ) {
471	PRINT( std::cerr << "____untyped: " << expr << std::endl; )
472	std::list<DesignatorChain>::iterator dit = desigAlts.begin();
473	if ( NameExpr * nexpr = dynamic_cast<NameExpr *>(expr) ) {
474	for ( Type * t : curTypes ) {
475	assert( dit != desigAlts.end() );
476	DesignatorChain & d = *dit;
477	PRINT( std::cerr << "____actual: " << t << std::endl; )
478	ReferenceToType * refType = dynamic_cast<ReferenceToType *>(t);
479	std::list<Declaration *> members;
480	if ( refType ) {
481	refType->lookup( nexpr->get_name(), members ); // concatenate identical field name
482	// xxx - need to also include anonymous members in this somehow...
483	for ( Declaration * mem: members ) {
484	if ( ObjectDecl * field = dynamic_cast<ObjectDecl *>(mem) ) {
485	PRINT( std::cerr << "____alt: " << field->get_type() << std::endl; )
486	DesignatorChain newD = d;
487	newD.push_back( new VariableExpr( field ) );
488	newDesigAlts.push_back( newD );
489	newTypes.push_back( field->get_type() );
490	} // if
491	} // for
492	} // if
493	++dit;
494	} // for
495	} else {
496	for ( Type * t : curTypes ) {
497	assert( dit != desigAlts.end() );
498	DesignatorChain & d = *dit;
499	if ( ArrayType * at = dynamic_cast< ArrayType * > ( t ) ) {
500	PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
501	d.push_back( expr );
502	newDesigAlts.push_back( d );
503	newTypes.push_back( at->get_base() );
504	}
505	++dit;
506	} // for
507	} // if
508	desigAlts = newDesigAlts;
509	newDesigAlts.clear();
510	curTypes = newTypes;
511	newTypes.clear();
512	assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
513	} // for
514	if ( desigAlts.size() > 1 ) {
515	throw SemanticError( toString("Too many alternatives (", desigAlts.size(), ") for designation: "), designation );
516	} else if ( desigAlts.size() == 0 ) {
517	throw SemanticError( "No reasonable alternatives for designation: ", designation );
518	}
519	DesignatorChain & d = desigAlts.back();
520	PRINT( for ( Expression * expr : d ) {
521	std::cerr << "____desig: " << expr << std::endl;
522	} ) // for
523	assertf( ! curTypes.empty(), "empty designator chosen");
524
525	// set new designators
526	assertf( ! objStack.empty(), "empty object stack when setting designation" );
527	Designation * actualDesignation = new Designation( d );
528	objStack.top()->setPosition( d ); // destroys d
529	return actualDesignation;
530	}
531
532	void CurrentObject::increment() {
533	PRINT( std::cerr << "____increment" << std::endl; )
534	if ( ! objStack.empty() ) {
535	PRINT( std::cerr << *objStack.top() << std::endl; )
536	objStack.top()->smallStep();
537	}
538	}
539
540	void CurrentObject::enterListInit() {
541	PRINT( std::cerr << "____entering list init" << std::endl; )
542	assertf( ! objStack.empty(), "empty obj stack entering list init" );
543	Type * type = objStack.top()->getNext();
544	if ( type ) {
545	objStack.push( createMemberIterator( type ) );
546	} else {
547	assertf( false, "not sure about this case..." );
548	}
549	}
550
551	void CurrentObject::exitListInit() {
552	PRINT( std::cerr << "____exiting list init" << std::endl; )
553	assertf( ! objStack.empty(), "objstack empty" );
554	delete objStack.top();
555	objStack.pop();
556	if ( ! objStack.empty() ) {
557	PRINT( std::cerr << *objStack.top() << std::endl; )
558	objStack.top()->bigStep();
559	}
560	}
561
562	std::list< InitAlternative > CurrentObject::getOptions() {
563	PRINT( std::cerr << "____getting current options" << std::endl; )
564	assertf( ! objStack.empty(), "objstack empty in getOptions" );
565	return **objStack.top();
566	}
567
568	Type * CurrentObject::getCurrentType() {
569	PRINT( std::cerr << "____getting current type" << std::endl; )
570	assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
571	return objStack.top()->getNext();
572	}
573	} // namespace ResolvExpr
574
575	// Local Variables: //
576	// tab-width: 4 //
577	// mode: c++ //
578	// compile-command: "make install" //
579	// End: //

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