source: src/ResolvExpr/CurrentObject.cc@ f22b170b

Last change on this file since f22b170b was c6b4432, checked in by Andrew Beach <ajbeach@…>, 23 months ago

Remove BaseSyntaxNode and clean-up.
  • Property mode set to 100644
File size: 20.6 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 : Andrew Beach
12// Last Modified On : Mon Apr 10 9:40:00 2023
13// Update Count : 18
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/Eval.h" // for eval
31#include "Common/Indenter.h" // for Indenter, operator<<
32#include "Common/SemanticError.h" // for SemanticError
33#include "Common/utility.h" // for toString
34#include "CurrentObject.h"
35
36#if 0
37#define PRINT(x) x
38#else
39#define PRINT(x)
40#endif
41
42namespace ast {
43 /// Iterates members of a type by initializer.
44 class MemberIterator {
45 public:
46 virtual ~MemberIterator() {}
47
48 /// Internal set position based on iterator ranges.
49 virtual void setPosition(
50 std::deque< ptr< Expr > >::const_iterator it,
51 std::deque< ptr< Expr > >::const_iterator end ) = 0;
52
53 /// Walks the current object using the given designators as a guide.
54 void setPosition( const std::deque< ptr< Expr > > & designators ) {
55 setPosition( designators.begin(), designators.end() );
56 }
57
58 /// Retrieve the list of possible (Type,Designation) pairs for the
59 /// current position in the current object.
60 virtual std::deque< InitAlternative > operator* () const = 0;
61
62 /// True if the iterator is not currently at the end.
63 virtual operator bool() const = 0;
64
65 /// Moves the iterator by one member in the current object.
66 virtual MemberIterator & bigStep() = 0;
67
68 /// Moves the iterator by one member in the current subobject.
69 virtual MemberIterator & smallStep() = 0;
70
71 /// The type of the current object.
72 virtual const Type * getType() = 0;
73
74 /// The type of the current subobject.
75 virtual const Type * getNext() = 0;
76
77 /// Helper for operator*; aggregates must add designator to each init
78 /// alternative, but adding designators in operator* creates duplicates.
79 virtual std::deque< InitAlternative > first() const = 0;
80 };
81
82 /// create a new MemberIterator that traverses a type correctly
83 MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type );
84
85 /// Iterates "other" types (e.g. basic, pointer) which do not change at list initializer entry
86 class SimpleIterator final : public MemberIterator {
87 CodeLocation location;
88 const Type * type = nullptr;
89 public:
90 SimpleIterator( const CodeLocation & loc, const Type * t ) : location( loc ), type( t ) {}
91
92 void setPosition(
93 std::deque< ptr< Expr > >::const_iterator begin,
94 std::deque< ptr< Expr > >::const_iterator end
95 ) override {
96 if ( begin != end ) {
97 SemanticError( location, "Un-designated initializer given non-empty designator" );
98 }
99 }
100
101 std::deque< InitAlternative > operator* () const override { return first(); }
102
103 operator bool() const override { return type; }
104
105 SimpleIterator & bigStep() override { return smallStep(); }
106 SimpleIterator & smallStep() override {
107 type = nullptr; // empty on increment because no members
108 return *this;
109 }
110
111 const Type * getType() override { return type; }
112
113 const Type * getNext() override { return type; }
114
115 std::deque< InitAlternative > first() const override {
116 if ( type ) return { InitAlternative{ type, new Designation{ location } } };
117 return {};
118 }
119 };
120
121 /// Iterates over an indexed type:
122 class IndexIterator : public MemberIterator {
123 protected:
124 CodeLocation location;
125 size_t index = 0;
126 size_t size = 0;
127 std::unique_ptr<MemberIterator> memberIter;
128 public:
129 IndexIterator( const CodeLocation & loc, size_t size ) :
130 location( loc ), size( size )
131 {}
132
133 void setPosition( const Expr * expr ) {
134 // need to permit integer-constant-expressions, including: integer constants,
135 // enumeration constants, character constants, sizeof expressions, alignof expressions,
136 // cast expressions
137
138 auto arg = eval( expr );
139 assertf( arg.hasKnownValue, "Non-evaluable expression made it to IndexIterator" );
140 index = arg.knownValue;
141
142 // if ( auto constExpr = dynamic_cast< const ConstantExpr * >( expr ) ) {
143 // try {
144 // index = constExpr->intValue();
145 // } catch ( SemanticErrorException & ) {
146 // SemanticError( expr, "Constant expression of non-integral type in array designator: " );
147 // }
148 // } else if ( auto castExpr = dynamic_cast< const CastExpr * >( expr ) ) {
149 // setPosition( castExpr->arg );
150 // } else if ( dynamic_cast< const SizeofExpr * >( expr ) || dynamic_cast< const AlignofExpr * >( expr ) ) {
151 // index = 0;
152 // } else {
153 // assertf( false, "2 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
154 // }
155 }
156
157 void setPosition(
158 std::deque<ast::ptr<ast::Expr>>::const_iterator begin,
159 std::deque<ast::ptr<ast::Expr>>::const_iterator end
160 ) override {
161 if ( begin == end ) return;
162
163 setPosition( *begin );
164 memberIter->setPosition( ++begin, end );
165 }
166
167 std::deque< InitAlternative > operator* () const override { return first(); }
168
169 operator bool() const override { return index < size; }
170 };
171
172 /// Iterates over the members of array types:
173 class ArrayIterator final : public IndexIterator {
174 const ArrayType * array = nullptr;
175 const Type * base = nullptr;
176
177 size_t getSize( const Expr * expr ) {
178 auto res = eval( expr );
179 if ( !res.hasKnownValue ) {
180 SemanticError( location, toString( "Array designator must be a constant expression: ", expr ) );
181 }
182 return res.knownValue;
183 }
184
185 public:
186 ArrayIterator( const CodeLocation & loc, const ArrayType * at ) :
187 IndexIterator( loc, getSize( at->dimension) ),
188 array( at ), base( at->base ) {
189 PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
190 memberIter.reset( createMemberIterator( loc, base ) );
191 if ( at->isVarLen ) {
192 SemanticError( location, at, "VLA initialization does not support @=: " );
193 }
194 }
195
196 ArrayIterator & bigStep() override {
197 PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
198 ++index;
199 memberIter.reset( index < size ? createMemberIterator( location, base ) : nullptr );
200 return *this;
201 }
202
203 ArrayIterator & smallStep() override {
204 PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
205 if ( memberIter ) {
206 PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
207 memberIter->smallStep();
208 if ( *memberIter ) {
209 PRINT( std::cerr << "has valid member iter" << std::endl; )
210 return *this;
211 }
212 }
213 return bigStep();
214 }
215
216 const Type * getType() override { return array; }
217
218 const Type * getNext() override { return base; }
219
220 std::deque< InitAlternative > first() const override {
221 PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
222 if ( memberIter && *memberIter ) {
223 std::deque< InitAlternative > ret = memberIter->first();
224 for ( InitAlternative & alt : ret ) {
225 alt.designation.get_and_mutate()->designators.emplace_front( ConstantExpr::from_ulong( location, index ) );
226 }
227 return ret;
228 }
229 return {};
230 }
231 };
232
233 class AggregateIterator : public MemberIterator {
234 protected:
235 using MemberList = std::vector< ptr< Decl > >;
236
237 CodeLocation location;
238 std::string kind; // for debug
239 std::string name;
240 const Type * inst;
241 const MemberList & members;
242 MemberList::const_iterator curMember;
243 bool atbegin = true; // false at first {small,big}Step
244 const Type * curType = nullptr;
245 std::unique_ptr< MemberIterator > memberIter = nullptr;
246 TypeSubstitution sub;
247
248 bool init() {
249 PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
250 if ( curMember != members.end() ) {
251 if ( auto field = curMember->as< ObjectDecl >() ) {
252 PRINT( std::cerr << "incremented to field: " << field << std::endl; )
253 curType = field->get_type();
254 memberIter.reset( createMemberIterator( location, curType ) );
255 return true;
256 }
257 }
258 return false;
259 }
260
261 AggregateIterator(
262 const CodeLocation & loc, const std::string k, const std::string & n, const Type * i,
263 const MemberList & ms )
264 : location( loc ), kind( k ), name( n ), inst( i ), members( ms ), curMember( ms.begin() ),
265 sub( genericSubstitution( i ) ) {
266 PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
267 init();
268 }
269
270 public:
271 void setPosition(
272 std::deque< ptr< Expr > >::const_iterator begin,
273 std::deque< ptr< Expr > >::const_iterator end
274 ) final {
275 if ( begin == end ) return;
276
277 if ( auto varExpr = begin->as< VariableExpr >() ) {
278 for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
279 if ( *curMember != varExpr->var ) continue;
280
281 ++begin;
282
283 memberIter.reset( createMemberIterator( location, varExpr->result ) );
284 curType = varExpr->result;
285 atbegin = curMember == members.begin() && begin == end;
286 memberIter->setPosition( begin, end );
287 return;
288 }
289 assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
290 } else {
291 assertf( false, "1 bad designator given to %s: %s", kind.c_str(), toString( *begin ).c_str() );
292 }
293 }
294
295 std::deque< InitAlternative > operator* () const final {
296 if ( memberIter && *memberIter ) {
297 std::deque< InitAlternative > ret = memberIter->first();
298 PRINT( std::cerr << "sub: " << sub << std::endl; )
299 for ( InitAlternative & alt : ret ) {
300 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
301 alt.designation.get_and_mutate()->designators.emplace_front(
302 new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
303 // need to substitute for generic types so that casts are to concrete types
304 alt.type = shallowCopy(alt.type.get());
305 PRINT( std::cerr << " type is: " << alt.type; )
306 sub.apply( alt.type ); // also apply to designation??
307 PRINT( std::cerr << " ==> " << alt.type << std::endl; )
308 }
309 return ret;
310 }
311 return {};
312 }
313
314 AggregateIterator & smallStep() final {
315 PRINT( std::cerr << "smallStep in " << kind << std::endl; )
316 atbegin = false;
317 if ( memberIter ) {
318 PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
319 memberIter->smallStep();
320 if ( *memberIter ) {
321 PRINT( std::cerr << "success!" << std::endl; )
322 return *this;
323 }
324 }
325 return bigStep();
326 }
327
328 AggregateIterator & bigStep() override = 0;
329
330 const Type * getType() final { return inst; }
331
332 const Type * getNext() final {
333 bool hasMember = memberIter && *memberIter;
334 return hasMember ? memberIter->getType() : nullptr;
335 }
336
337 std::deque< InitAlternative > first() const final {
338 std::deque< InitAlternative > ret;
339 PRINT( std::cerr << "first " << kind << std::endl; )
340 if ( memberIter && *memberIter ) {
341 PRINT( std::cerr << "adding children" << std::endl; )
342 ret = memberIter->first();
343 for ( InitAlternative & alt : ret ) {
344 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
345 alt.designation.get_and_mutate()->designators.emplace_front(
346 new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
347 }
348 }
349 if ( atbegin ) {
350 // only add self if at the very beginning of the structure
351 PRINT( std::cerr << "adding self" << std::endl; )
352 ret.emplace_front( inst, new Designation{ location } );
353 }
354 return ret;
355 }
356 };
357
358 class StructIterator final : public AggregateIterator {
359 public:
360 StructIterator( const CodeLocation & loc, const StructInstType * inst )
361 : AggregateIterator( loc, "StructIterator", inst->name, inst, inst->base->members ) {}
362
363 operator bool() const override {
364 return curMember != members.end() || (memberIter && *memberIter);
365 }
366
367 StructIterator & bigStep() override {
368 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
369 atbegin = false;
370 memberIter = nullptr;
371 curType = nullptr;
372 while ( curMember != members.end() ) {
373 ++curMember;
374 if ( init() ) return *this;
375 }
376 return *this;
377 }
378 };
379
380 class UnionIterator final : public AggregateIterator {
381 public:
382 UnionIterator( const CodeLocation & loc, const UnionInstType * inst )
383 : AggregateIterator( loc, "UnionIterator", inst->name, inst, inst->base->members ) {}
384
385 operator bool() const override { return memberIter && *memberIter; }
386
387 UnionIterator & bigStep() override {
388 // unions only initialize one member
389 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
390 atbegin = false;
391 memberIter = nullptr;
392 curType = nullptr;
393 curMember = members.end();
394 return *this;
395 }
396 };
397
398 /// Iterates across the positions in a tuple:
399 class TupleIterator final : public IndexIterator {
400 ast::TupleType const * const tuple;
401
402 const ast::Type * typeAtIndex() const {
403 assert( index < size );
404 return tuple->types[ index ].get();
405 }
406
407 public:
408 TupleIterator( const CodeLocation & loc, const TupleType * type )
409 : IndexIterator( loc, type->size() ), tuple( type ) {
410 PRINT( std::cerr << "Creating tuple iterator: " << type << std::endl; )
411 memberIter.reset( createMemberIterator( loc, typeAtIndex() ) );
412 }
413
414 TupleIterator & bigStep() override {
415 ++index;
416 memberIter.reset( index < size ?
417 createMemberIterator( location, typeAtIndex() ) : nullptr );
418 return *this;
419 }
420
421 TupleIterator & smallStep() override {
422 if ( memberIter ) {
423 PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
424 memberIter->smallStep();
425 if ( !memberIter ) {
426 PRINT( std::cerr << "has valid member iter" << std::endl; )
427 return *this;
428 }
429 }
430 return bigStep();
431 }
432
433 const ast::Type * getType() override {
434 return tuple;
435 }
436
437 const ast::Type * getNext() override {
438 bool hasMember = memberIter && *memberIter;
439 return hasMember ? memberIter->getType() : nullptr;
440 }
441
442 std::deque< InitAlternative > first() const override {
443 PRINT( std::cerr << "first in TupleIterator (" << index << "/" << size << ")" << std::endl; )
444 if ( memberIter && *memberIter ) {
445 std::deque< InitAlternative > ret = memberIter->first();
446 for ( InitAlternative & alt : ret ) {
447 alt.designation.get_and_mutate()->designators.emplace_front(
448 ConstantExpr::from_ulong( location, index ) );
449 }
450 return ret;
451 }
452 return {};
453 }
454 };
455
456 MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type ) {
457 if ( auto aggr = dynamic_cast< const BaseInstType * >( type ) ) {
458 if ( auto sit = dynamic_cast< const StructInstType * >( aggr ) ) {
459 assert( sit->base );
460 return new StructIterator{ loc, sit };
461 } else if ( auto uit = dynamic_cast< const UnionInstType * >( aggr ) ) {
462 assert( uit->base );
463 return new UnionIterator{ loc, uit };
464 } else {
465 assertf(
466 dynamic_cast< const EnumInstType * >( type )
467 || dynamic_cast< const TypeInstType * >( type ),
468 "Encountered unhandled BaseInstType in createMemberIterator: %s",
469 toString( type ).c_str() );
470 return new SimpleIterator{ loc, type };
471 }
472 } else if ( auto at = dynamic_cast< const ArrayType * >( type ) ) {
473 return new ArrayIterator{ loc, at };
474 } else if ( auto tt = dynamic_cast< const TupleType * >( type ) ) {
475 return new TupleIterator{ loc, tt };
476 } else {
477 return new SimpleIterator{ loc, type };
478 }
479 }
480
481 CurrentObject::CurrentObject( const CodeLocation & loc, const Type * type ) : objStack() {
482 objStack.emplace_back( new SimpleIterator{ loc, type } );
483 }
484
485 const Designation * CurrentObject::findNext( const Designation * designation ) {
486 using DesignatorChain = std::deque< ptr< Expr > >;
487 PRINT( std::cerr << "___findNext" << std::endl; )
488
489 // find all the d's
490 std::vector< DesignatorChain > desigAlts{ {} }, newDesigAlts;
491 std::deque< const Type * > curTypes{ objStack.back()->getType() }, newTypes;
492 for ( const Expr * expr : designation->designators ) {
493 PRINT( std::cerr << "____untyped: " << expr << std::endl; )
494 auto dit = desigAlts.begin();
495
496 for ( const Type * t : curTypes ) {
497 assert( dit != desigAlts.end() );
498 DesignatorChain & d = *dit;
499 if ( auto nexpr = dynamic_cast< const NameExpr *>( expr ) ) {
500 PRINT( std::cerr << "____actual: " << t << std::endl; )
501 if ( auto refType = dynamic_cast< const BaseInstType * >( t ) ) {
502 // concatenate identical field names
503 for ( const Decl * mem : refType->lookup( nexpr->name ) ) {
504 if ( auto field = dynamic_cast< const ObjectDecl * >( mem ) ) {
505 PRINT( std::cerr << "____alt: " << field->type << std::endl; )
506 DesignatorChain d2 = d;
507 d2.emplace_back( new VariableExpr{ expr->location, field } );
508 newDesigAlts.emplace_back( std::move( d2 ) );
509 newTypes.emplace_back( field->type );
510 }
511 }
512 } else if ( auto at = dynamic_cast< const ArrayType * >( t ) ) {
513 auto nexpr = dynamic_cast< const NameExpr *>( expr );
514 for ( const Decl * mem : refType->lookup( nexpr->name ) ) {
515 if ( auto field = dynamic_cast< const ObjectDecl * >( mem ) ) {
516 DesignatorChain d2 = d;
517 d2.emplace_back( new VariableExpr{ expr->location, field } );
518 newDesigAlts.emplace_back( std::move( d2 ) );
519 newTypes.emplace_back( at->base );
520 }
521 }
522 }
523
524 ++dit;
525 } else {
526 if ( auto at = dynamic_cast< const ArrayType * >( t ) ) {
527 PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
528 d.emplace_back( expr );
529 newDesigAlts.emplace_back( d );
530 newTypes.emplace_back( at->base );
531 }
532 }
533 }
534
535 // reset queue
536 desigAlts = std::move( newDesigAlts );
537 newDesigAlts.clear();
538 curTypes = std::move( newTypes );
539 newTypes.clear();
540 assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
541 }
542
543 if ( desigAlts.size() > 1 ) {
544 SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
545 } else if ( desigAlts.empty() ) {
546 SemanticError( designation, "No reasonable alternatives for designation: " );
547 }
548
549 DesignatorChain & d = desigAlts.back();
550 PRINT( for ( Expression * expr : d ) {
551 std::cerr << "____desig: " << expr << std::endl;
552 } ) // for
553 assertf( ! curTypes.empty(), "empty designator chosen");
554
555 // set new designators
556 assertf( ! objStack.empty(), "empty object stack when setting designation" );
557 Designation * actualDesignation =
558 new Designation{ designation->location, DesignatorChain{d} };
559 objStack.back()->setPosition( d ); // destroys d
560 return actualDesignation;
561 }
562
563 void CurrentObject::setNext( const Designation * designation ) {
564 PRINT( std::cerr << "____setNext" << designation << std::endl; )
565 assertf( ! objStack.empty(), "obj stack empty in setNext" );
566 objStack.back()->setPosition( designation->designators );
567 }
568
569 void CurrentObject::increment() {
570 PRINT( std::cerr << "____increment" << std::endl; )
571 if ( objStack.empty() ) return;
572 PRINT( std::cerr << *objStack.back() << std::endl; )
573 objStack.back()->smallStep();
574 }
575
576 void CurrentObject::enterListInit( const CodeLocation & loc ) {
577 PRINT( std::cerr << "____entering list init" << std::endl; )
578 assertf( ! objStack.empty(), "empty obj stack entering list init" );
579 const ast::Type * type = objStack.back()->getNext();
580 assert( type );
581 objStack.emplace_back( createMemberIterator( loc, type ) );
582 }
583
584 void CurrentObject::exitListInit() {
585 PRINT( std::cerr << "____exiting list init" << std::endl; )
586 assertf( ! objStack.empty(), "objstack empty" );
587 objStack.pop_back();
588 if ( ! objStack.empty() ) {
589 PRINT( std::cerr << *objStack.back() << std::endl; )
590 objStack.back()->bigStep();
591 }
592 }
593
594 std::deque< InitAlternative > CurrentObject::getOptions() {
595 PRINT( std::cerr << "____getting current options" << std::endl; )
596 assertf( ! objStack.empty(), "objstack empty in getOptions" );
597 return **objStack.back();
598 }
599
600 const Type * CurrentObject::getCurrentType() {
601 PRINT( std::cerr << "____getting current type" << std::endl; )
602 assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
603 return objStack.back()->getNext();
604 }
605}
606
607// Local Variables: //
608// tab-width: 4 //
609// mode: c++ //
610// compile-command: "make install" //
611// End: //
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