source: src/ResolvExpr/CurrentObject.cc@ 5f95b5f

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since 5f95b5f was 84e8423, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

Fix initialization issue with nested unions
  • 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
39namespace 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 ) throw SemanticError( "VLA initialization does not support @=", at );
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 ( SemanticError & ) {
158 throw SemanticError( "Constant expression of non-integral type in array dimension: ", expr );
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( SemanticError & ) {
181 throw SemanticError( "Constant expression of non-integral type in array designator: ", expr );
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 throw SemanticError( toString("Too many alternatives (", desigAlts.size(), ") for designation: "), designation );
535 } else if ( desigAlts.size() == 0 ) {
536 throw SemanticError( "No reasonable alternatives for designation: ", 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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