source: src/ResolvExpr/CurrentObject.cc@ 1bc749f

ADT arm-eh ast-experimental cleanup-dtors enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 1bc749f was e3e16bc, checked in by Thierry Delisle <tdelisle@…>, 8 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
39namespace 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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