source: src/ResolvExpr/CurrentObject.cc@ 34ed17b

ADT ast-experimental
Last change on this file since 34ed17b was f37d9e7, checked in by Peter A. Buhr <pabuhr@…>, 3 years ago

change CurrentObject.cc to use eval rather than ad-hoc constant-expression evaluation
  • Property mode set to 100644
File size: 37.0 KB
RevLine 
[e4d829b]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
[f37d9e7]11// Last Modified By : Peter A. Buhr
12// Last Modified On : Fri Jul 1 09:16:01 2022
13// Update Count : 15
[e4d829b]14//
15
[ea6332d]16#include <stddef.h> // for size_t
17#include <cassert> // for assertf, assert, safe_dynamic_...
[60aaa51d]18#include <deque>
[ea6332d]19#include <iostream> // for ostream, operator<<, basic_ost...
20#include <stack> // for stack
21#include <string> // for string, operator<<, allocator
[e4d829b]22
[8e1467d]23#include "AST/Copy.hpp" // for shallowCopy
[2b59f55]24#include "AST/Expr.hpp" // for InitAlternative
[60aaa51d]25#include "AST/GenericSubstitution.hpp" // for genericSubstitution
[2b59f55]26#include "AST/Init.hpp" // for Designation
27#include "AST/Node.hpp" // for readonly
[2890212]28#include "AST/Print.hpp" // for readonly
[60aaa51d]29#include "AST/Type.hpp"
[ea6332d]30#include "Common/Indenter.h" // for Indenter, operator<<
31#include "Common/SemanticError.h" // for SemanticError
32#include "Common/utility.h" // for toString
[e4d829b]33#include "CurrentObject.h"
[ea6332d]34#include "SynTree/Constant.h" // for Constant
35#include "SynTree/Declaration.h" // for ObjectDecl, Declaration, Struc...
36#include "SynTree/Expression.h" // for InitAlternative, VariableExpr
37#include "SynTree/Initializer.h" // for Designation, operator<<
38#include "SynTree/Type.h" // for Type, StructInstType, UnionIns...
39#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
[e4d829b]40
41#if 0
42#define PRINT(x) x
43#else
44#define PRINT(x)
45#endif
46
47namespace ResolvExpr {
[62423350]48 template< typename AggrInst >
49 TypeSubstitution makeGenericSubstitution( AggrInst * inst ) {
50 assert( inst );
51 assert( inst->get_baseParameters() );
52 std::list< TypeDecl * > baseParams = *inst->get_baseParameters();
53 std::list< Expression * > typeSubs = inst->get_parameters();
54 TypeSubstitution subs( baseParams.begin(), baseParams.end(), typeSubs.begin() );
55 return subs;
56 }
57
58 TypeSubstitution makeGenericSubstitution( Type * type ) {
59 if ( StructInstType * inst = dynamic_cast< StructInstType * >( type ) ) {
60 return makeGenericSubstitution( inst );
61 } else if ( UnionInstType * inst = dynamic_cast< UnionInstType * >( type ) ) {
62 return makeGenericSubstitution( inst );
63 } else {
64 return TypeSubstitution();
65 }
66 }
67
[e4d829b]68 class MemberIterator {
69 public:
70 virtual ~MemberIterator() {}
71
[84e8423]72 /// walks the current object using the given designators as a guide
[e4d829b]73 virtual void setPosition( std::list< Expression * > & designators ) = 0;
[84e8423]74
[1df492a]75 /// retrieve the list of possible Type/Designation pairs for the current position in the currect object
[e4d829b]76 virtual std::list<InitAlternative> operator*() const = 0;
[84e8423]77
78 /// true if the iterator is not currently at the end
[e4d829b]79 virtual operator bool() const = 0;
[84e8423]80
81 /// moves the iterator by one member in the current object
[e4d829b]82 virtual MemberIterator & bigStep() = 0;
[84e8423]83
84 /// moves the iterator by one member in the current subobject
[e4d829b]85 virtual MemberIterator & smallStep() = 0;
[84e8423]86
87 /// the type of the current object
[e4d829b]88 virtual Type * getType() = 0;
[84e8423]89
90 /// the type of the current subobject
[e4d829b]91 virtual Type * getNext() = 0;
92
[84e8423]93 /// printing for debug
[e4d829b]94 virtual void print( std::ostream & out, Indenter indent ) const = 0;
95
[84e8423]96 /// helper for operator*; aggregates must add designator to each init alternative, but
97 /// adding designators in operator* creates duplicates.
[e4d829b]98 virtual std::list<InitAlternative> first() const = 0; // should be protected
99 };
100
101 std::ostream & operator<<(std::ostream & out, const MemberIterator & it) {
102 Indenter indenter;
103 it.print( out, indenter );
104 return out;
105 }
106
107 /// create a new MemberIterator that traverses a type correctly
108 MemberIterator * createMemberIterator( Type * type );
109
110 /// iterates "other" types, e.g. basic types, pointer types, etc. which do not change at list initializer entry
111 class SimpleIterator : public MemberIterator {
112 public:
113 SimpleIterator( Type * type ) : type( type ) {}
114
115 virtual void setPosition( std::list< Expression * > & designators ) {
116 assertf( designators.empty(), "simple iterator given non-empty designator..." ); // xxx - might be semantic error
117 }
118
119 virtual std::list<InitAlternative> operator*() const { return first(); }
120 virtual operator bool() const { return type; }
121
122 // big step is the same as small step
123 virtual MemberIterator & bigStep() { return smallStep(); }
124 virtual MemberIterator & smallStep() {
125 type = nullptr; // type is nullified on increment since SimpleIterators do not have members
126 return *this;
127 }
128
[9ff56e7]129 virtual void print( std::ostream & out, __attribute__((unused)) Indenter indent ) const {
[e4d829b]130 out << "SimpleIterator(" << type << ")";
131 }
132
133 virtual Type * getType() { return type; }
134 virtual Type * getNext() { return type; }
135
136 protected:
137 virtual std::list<InitAlternative> first() const {
138 if ( type ) return std::list<InitAlternative>{ { type->clone(), new Designation( {} ) } };
139 else return std::list<InitAlternative>{};
140 }
141 private:
142 Type * type = nullptr;
143 };
144
145 class ArrayIterator : public MemberIterator {
146 public:
147 ArrayIterator( ArrayType * at ) : array( at ) {
148 PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
[f072892]149 base = at->base;
[e4d829b]150 memberIter = createMemberIterator( base );
[f072892]151 if ( at->isVarLen ) SemanticError( at, "VLA initialization does not support @=: " );
152 setSize( at->dimension );
[e4d829b]153 }
154
155 ~ArrayIterator() {
156 delete memberIter;
157 }
158
159 private:
[f37d9e7]160 void setSize( Expression * expr ) {
161 auto res = eval( expr );
[ba4a1d8]162 if (res.second) {
163 size = res.first;
[e4d829b]164 } else {
[ba4a1d8]165 SemanticError( expr->location, toString("Array designator must be a constant expression: ", expr) );
[e4d829b]166 }
167 }
168
169 public:
170 void setPosition( Expression * expr ) {
171 // need to permit integer-constant-expressions, including: integer constants, enumeration constants, character constants, sizeof expressions, _Alignof expressions, cast expressions
[f37d9e7]172 auto arg = eval( expr );
173 index = arg.first;
174 return;
175
176 // if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
177 // try {
178 // index = constExpr->intValue();
179 // } catch( SemanticErrorException & ) {
180 // SemanticError( expr, "Constant expression of non-integral type in array designator: " );
181 // }
182 // } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
183 // setPosition( castExpr->get_arg() );
184 // } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
185 // EnumInstType * inst = dynamic_cast<EnumInstType *>( varExpr->get_result() );
186 // assertf( inst, "ArrayIterator given variable that isn't an enum constant : %s", toString( expr ).c_str() );
187 // long long int value;
188 // if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {
189 // index = value;
190 // }
191 // } else if ( dynamic_cast< SizeofExpr * >( expr ) || dynamic_cast< AlignofExpr * >( expr ) ) {
192 // index = 0; // xxx - get actual sizeof/alignof value?
193 // } else {
194 // assertf( false, "4 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
195 // }
[e4d829b]196 }
197
198 virtual void setPosition( std::list< Expression * > & designators ) {
199 if ( ! designators.empty() ) {
200 setPosition( designators.front() );
201 designators.pop_front();
202 memberIter->setPosition( designators );
203 }
204 }
205
206 virtual std::list<InitAlternative> operator*() const {
207 return first();
208 }
209
[4b97770]210 virtual operator bool() const { return index < size; }
[e4d829b]211
212 virtual MemberIterator & bigStep() {
213 PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
214 ++index;
215 delete memberIter;
[4b97770]216 if ( index < size ) memberIter = createMemberIterator( base );
[e4d829b]217 else memberIter = nullptr;
218 return *this;
219 }
220
221 virtual MemberIterator & smallStep() {
222 PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
223 if ( memberIter ) {
224 PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
225 memberIter->smallStep();
226 if ( *memberIter ) {
227 PRINT( std::cerr << "has valid member iter" << std::endl; )
228 return *this;
229 }
230 }
231 return bigStep();
232 }
233
234 virtual Type * getType() { return array; }
235 virtual Type * getNext() { return base; }
236
237 virtual std::list<InitAlternative> first() const {
238 PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
239 if ( memberIter && *memberIter ) {
240 std::list<InitAlternative> ret = memberIter->first();
241 for ( InitAlternative & alt : ret ) {
242 alt.designation->get_designators().push_front( new ConstantExpr( Constant::from_ulong( index ) ) );
243 }
244 return ret;
245 }
246 return std::list<InitAlternative>();
247 }
248
249 virtual void print( std::ostream & out, Indenter indent ) const {
250 out << "ArrayIterator(Array of " << base << ")";
251 if ( memberIter ) {
252 Indenter childIndent = indent+1;
253 out << std::endl << childIndent;
254 memberIter->print( out, childIndent );
255 }
256 }
257
258 private:
259 ArrayType * array = nullptr;
260 Type * base = nullptr;
261 size_t index = 0;
262 size_t size = 0;
263 MemberIterator * memberIter = nullptr;
264 };
265
266 class AggregateIterator : public MemberIterator {
267 public:
[62423350]268 typedef std::list<Declaration *> MemberList;
269 typedef MemberList::const_iterator iterator;
270 std::string kind = ""; // for debug
271 std::string name;
272 Type * inst = nullptr;
273 const MemberList & members;
[e4d829b]274 iterator curMember;
[62423350]275 bool atbegin = true; // false at first {small,big}Step -- this aggr type is only added to the possibilities at the beginning
[e4d829b]276 Type * curType = nullptr;
277 MemberIterator * memberIter = nullptr;
[62423350]278 mutable TypeSubstitution sub;
[e4d829b]279
[62423350]280 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 ) ) {
[c6747a1]281 PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
[e4d829b]282 init();
283 }
284
285 virtual ~AggregateIterator() {
286 delete memberIter;
287 }
288
289 bool init() {
[62423350]290 PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
291 if ( curMember != members.end() ) {
[e4d829b]292 if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( *curMember ) ) {
293 PRINT( std::cerr << "incremented to field: " << field << std::endl; )
294 curType = field->get_type();
295 memberIter = createMemberIterator( curType );
296 return true;
297 }
298 }
299 return false;
300 }
301
302 virtual std::list<InitAlternative> operator*() const {
303 if (memberIter && *memberIter) {
304 std::list<InitAlternative> ret = memberIter->first();
[62423350]305 PRINT( std::cerr << "sub: " << sub << std::endl; )
[e4d829b]306 for ( InitAlternative & alt : ret ) {
307 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
[e3e16bc]308 alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
[62423350]309 // need to substitute for generic types, so that casts are to concrete types
310 PRINT( std::cerr << " type is: " << alt.type; )
311 sub.apply( alt.type ); // also apply to designation??
312 PRINT( std::cerr << " ==> " << alt.type << std::endl; )
[e4d829b]313 }
314 return ret;
315 }
316 return std::list<InitAlternative>();
317 }
318
319 virtual void setPosition( std::list< Expression * > & designators ) {
320 if ( ! designators.empty() ) {
321 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( designators.front() ) ) {
[62423350]322 for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
[e4d829b]323 if ( *curMember == varExpr->get_var() ) {
324 designators.pop_front();
325 delete memberIter;
326 memberIter = createMemberIterator( varExpr->get_result() );
327 curType = varExpr->get_result();
[62423350]328 atbegin = curMember == members.begin() && designators.empty(); // xxx - is this the right condition for atbegin??
[e4d829b]329 memberIter->setPosition( designators );
330 return;
331 } // if
332 } // for
[62423350]333 assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
[e4d829b]334 } else {
[f37d9e7]335 assertf( false, "3 bad designator given to %s: %s", kind.c_str(), toString( designators.front() ).c_str() );
[e4d829b]336 } // if
337 } // if
338 }
339
340 virtual MemberIterator & smallStep() {
341 PRINT( std::cerr << "smallStep in " << kind << std::endl; )
342 atbegin = false;
343 if ( memberIter ) {
344 PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
345 memberIter->smallStep();
346 if ( *memberIter ) {
347 PRINT( std::cerr << "success!" << std::endl; )
348 return *this;
349 }
350 }
351 return bigStep();
352 }
353
354 virtual Type * getType() { return inst; }
355 virtual Type * getNext() {
356 if ( memberIter && *memberIter ) return memberIter->getType(); // xxx - ??? recursive call???
357 return nullptr;
358 }
359
360 virtual std::list<InitAlternative> first() const {
361 std::list<InitAlternative> ret;
362 PRINT( std::cerr << "first " << kind << std::endl; )
363 if ( memberIter && *memberIter ) { // might not need *memberIter??
364 PRINT( std::cerr << "adding children" << std::endl; )
365 ret = memberIter->first();
366 for ( InitAlternative & alt : ret ) {
367 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
[e3e16bc]368 alt.designation->get_designators().push_front( new VariableExpr( strict_dynamic_cast< ObjectDecl * >( *curMember ) ) );
[e4d829b]369 }
370 }
[84e8423]371 if ( atbegin ) {
[e4d829b]372 // xxx - what about case of empty struct??
373 // only add self if at the very beginning of the structure
374 PRINT( std::cerr << "adding self" << std::endl; )
375 ret.push_front( { inst->clone(), new Designation( {} ) } );
376 }
377 return ret;
378 }
379
380 virtual void print( std::ostream & out, Indenter indent ) const {
[62423350]381 out << kind << "(" << name << ")";
[e4d829b]382 if ( memberIter ) {
383 Indenter childIndent = indent+1;
384 out << std::endl << childIndent;
385 memberIter->print( out, childIndent );
386 }
387 }
388 };
389
390 class UnionIterator : public AggregateIterator {
391 public:
[62423350]392 UnionIterator( UnionInstType * inst ) : AggregateIterator( "UnionIterator", inst->get_name(), inst, inst->get_baseUnion()->get_members() ) {}
[e4d829b]393
394 virtual operator bool() const { return (memberIter && *memberIter); }
395 virtual MemberIterator & bigStep() {
396 // unions only initialize one member
397 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
398 atbegin = false;
399 delete memberIter;
400 memberIter = nullptr;
401 curType = nullptr;
[62423350]402 curMember = members.end();
[e4d829b]403 return *this;
404 }
405 };
406
407 class StructIterator : public AggregateIterator {
408 public:
[62423350]409 StructIterator( StructInstType * inst ) : AggregateIterator( "StructIterator", inst->get_name(), inst, inst->get_baseStruct()->get_members() ) {}
410
411 virtual operator bool() const { return curMember != members.end() || (memberIter && *memberIter); }
412
413 virtual MemberIterator & bigStep() {
414 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
415 atbegin = false;
416 delete memberIter;
417 memberIter = nullptr;
418 curType = nullptr;
419 for ( ; curMember != members.end(); ) {
420 ++curMember;
421 if ( init() ) {
422 return *this;
423 }
424 }
425 return *this;
426 }
427 };
428
429 class TupleIterator : public AggregateIterator {
430 public:
431 TupleIterator( TupleType * inst ) : AggregateIterator( "TupleIterator", toString("Tuple", inst->size()), inst, inst->get_members() ) {}
[e4d829b]432
[62423350]433 virtual operator bool() const { return curMember != members.end() || (memberIter && *memberIter); }
[e4d829b]434
435 virtual MemberIterator & bigStep() {
436 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
437 atbegin = false;
438 delete memberIter;
439 memberIter = nullptr;
440 curType = nullptr;
[62423350]441 for ( ; curMember != members.end(); ) {
[e4d829b]442 ++curMember;
443 if ( init() ) {
444 return *this;
445 }
446 }
447 return *this;
448 }
449 };
450
451 MemberIterator * createMemberIterator( Type * type ) {
452 if ( ReferenceToType * aggr = dynamic_cast< ReferenceToType * >( type ) ) {
453 if ( StructInstType * sit = dynamic_cast< StructInstType * >( aggr ) ) {
454 return new StructIterator( sit );
455 } else if ( UnionInstType * uit = dynamic_cast< UnionInstType * >( aggr ) ) {
456 return new UnionIterator( uit );
457 } else {
[78754d7]458 assertf( dynamic_cast< EnumInstType * >( type ) || dynamic_cast< TypeInstType * >( type ), "Encountered unhandled ReferenceToType in createMemberIterator: %s", toString( type ).c_str() );
[62423350]459 return new SimpleIterator( type );
[e4d829b]460 }
461 } else if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
462 return new ArrayIterator( at );
[62423350]463 } else if ( TupleType * tt = dynamic_cast< TupleType * >( type ) ) {
464 return new TupleIterator( tt );
[e4d829b]465 } else {
466 return new SimpleIterator( type );
467 }
468 }
469
470 CurrentObject::CurrentObject() {}
471 CurrentObject::CurrentObject( Type * type ) {
472 objStack.push( new SimpleIterator( type ) );
473 }
474
475
476 void CurrentObject::setNext( Designation * designation ) {
477 assertf( ! objStack.empty(), "obj stack empty in setNext" );
478 PRINT( std::cerr << "____setNext" << designation << std::endl; )
479 objStack.top()->setPosition( designation->get_designators() );
480 }
481
482 Designation * CurrentObject::findNext( Designation * designation ) {
483 typedef std::list< Expression * > DesignatorChain;
484 PRINT( std::cerr << "___findNext" << std::endl; )
485 // find all the d's
486 std::list<DesignatorChain> desigAlts{ { } }, newDesigAlts;
487 std::list<Type *> curTypes { (objStack.top())->getType() }, newTypes;
488 for ( Expression * expr : designation->get_designators() ) {
489 PRINT( std::cerr << "____untyped: " << expr << std::endl; )
490 std::list<DesignatorChain>::iterator dit = desigAlts.begin();
491 if ( NameExpr * nexpr = dynamic_cast<NameExpr *>(expr) ) {
492 for ( Type * t : curTypes ) {
493 assert( dit != desigAlts.end() );
494 DesignatorChain & d = *dit;
495 PRINT( std::cerr << "____actual: " << t << std::endl; )
496 ReferenceToType * refType = dynamic_cast<ReferenceToType *>(t);
497 std::list<Declaration *> members;
498 if ( refType ) {
499 refType->lookup( nexpr->get_name(), members ); // concatenate identical field name
500 // xxx - need to also include anonymous members in this somehow...
501 for ( Declaration * mem: members ) {
502 if ( ObjectDecl * field = dynamic_cast<ObjectDecl *>(mem) ) {
503 PRINT( std::cerr << "____alt: " << field->get_type() << std::endl; )
504 DesignatorChain newD = d;
505 newD.push_back( new VariableExpr( field ) );
506 newDesigAlts.push_back( newD );
507 newTypes.push_back( field->get_type() );
508 } // if
509 } // for
510 } // if
511 ++dit;
512 } // for
513 } else {
514 for ( Type * t : curTypes ) {
515 assert( dit != desigAlts.end() );
516 DesignatorChain & d = *dit;
517 if ( ArrayType * at = dynamic_cast< ArrayType * > ( t ) ) {
518 PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
519 d.push_back( expr );
520 newDesigAlts.push_back( d );
521 newTypes.push_back( at->get_base() );
522 }
523 ++dit;
524 } // for
525 } // if
526 desigAlts = newDesigAlts;
527 newDesigAlts.clear();
528 curTypes = newTypes;
529 newTypes.clear();
[56e49b0]530 assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
[e4d829b]531 } // for
532 if ( desigAlts.size() > 1 ) {
[a16764a6]533 SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
[e4d829b]534 } else if ( desigAlts.size() == 0 ) {
[a16764a6]535 SemanticError( designation, "No reasonable alternatives for designation: " );
[e4d829b]536 }
537 DesignatorChain & d = desigAlts.back();
538 PRINT( for ( Expression * expr : d ) {
539 std::cerr << "____desig: " << expr << std::endl;
540 } ) // for
541 assertf( ! curTypes.empty(), "empty designator chosen");
542
543 // set new designators
544 assertf( ! objStack.empty(), "empty object stack when setting designation" );
545 Designation * actualDesignation = new Designation( d );
546 objStack.top()->setPosition( d ); // destroys d
547 return actualDesignation;
548 }
549
550 void CurrentObject::increment() {
551 PRINT( std::cerr << "____increment" << std::endl; )
552 if ( ! objStack.empty() ) {
553 PRINT( std::cerr << *objStack.top() << std::endl; )
554 objStack.top()->smallStep();
555 }
556 }
557
558 void CurrentObject::enterListInit() {
559 PRINT( std::cerr << "____entering list init" << std::endl; )
560 assertf( ! objStack.empty(), "empty obj stack entering list init" );
561 Type * type = objStack.top()->getNext();
562 if ( type ) {
563 objStack.push( createMemberIterator( type ) );
564 } else {
565 assertf( false, "not sure about this case..." );
566 }
567 }
568
569 void CurrentObject::exitListInit() {
570 PRINT( std::cerr << "____exiting list init" << std::endl; )
571 assertf( ! objStack.empty(), "objstack empty" );
572 delete objStack.top();
573 objStack.pop();
574 if ( ! objStack.empty() ) {
575 PRINT( std::cerr << *objStack.top() << std::endl; )
576 objStack.top()->bigStep();
577 }
578 }
579
580 std::list< InitAlternative > CurrentObject::getOptions() {
581 PRINT( std::cerr << "____getting current options" << std::endl; )
582 assertf( ! objStack.empty(), "objstack empty in getOptions" );
583 return **objStack.top();
584 }
[62423350]585
586 Type * CurrentObject::getCurrentType() {
587 PRINT( std::cerr << "____getting current type" << std::endl; )
588 assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
589 return objStack.top()->getNext();
590 }
[e4d829b]591} // namespace ResolvExpr
592
[b7d92b96]593namespace ast {
[60aaa51d]594 /// create a new MemberIterator that traverses a type correctly
595 MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type );
[b7d92b96]596
597 /// Iterates "other" types (e.g. basic, pointer) which do not change at list initializer entry
598 class SimpleIterator final : public MemberIterator {
[2b59f55]599 CodeLocation location;
[954c954]600 const Type * type = nullptr;
[b7d92b96]601 public:
[2b59f55]602 SimpleIterator( const CodeLocation & loc, const Type * t ) : location( loc ), type( t ) {}
603
[2890212]604 void setPosition(
605 std::deque< ptr< Expr > >::const_iterator begin,
[60aaa51d]606 std::deque< ptr< Expr > >::const_iterator end
607 ) override {
608 if ( begin != end ) {
609 SemanticError( location, "Un-designated initializer given non-empty designator" );
610 }
611 }
[2b59f55]612
[60aaa51d]613 std::deque< InitAlternative > operator* () const override { return first(); }
614
615 operator bool() const override { return type; }
616
617 SimpleIterator & bigStep() override { return smallStep(); }
618 SimpleIterator & smallStep() override {
619 type = nullptr; // empty on increment because no members
620 return *this;
621 }
622
623 const Type * getType() override { return type; }
624
625 const Type * getNext() override { return type; }
626
627 std::deque< InitAlternative > first() const override {
[2b59f55]628 if ( type ) return { InitAlternative{ type, new Designation{ location } } };
629 return {};
630 }
[b7d92b96]631 };
632
[60aaa51d]633 /// Iterates array types
634 class ArrayIterator final : public MemberIterator {
635 CodeLocation location;
[954c954]636 const ArrayType * array = nullptr;
637 const Type * base = nullptr;
[60aaa51d]638 size_t index = 0;
639 size_t size = 0;
640 std::unique_ptr< MemberIterator > memberIter;
641
642 void setSize( const Expr * expr ) {
[f37d9e7]643 auto res = eval( expr );
[60aaa51d]644 if ( ! res.second ) {
[f37d9e7]645 SemanticError( location, toString( "Array designator must be a constant expression: ", expr ) );
[60aaa51d]646 }
647 size = res.first;
648 }
649
650 public:
[f37d9e7]651 ArrayIterator( const CodeLocation & loc, const ArrayType * at ) : location( loc ), array( at ), base( at->base ) {
[60aaa51d]652 PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
653 memberIter.reset( createMemberIterator( loc, base ) );
654 if ( at->isVarLen ) {
655 SemanticError( location, at, "VLA initialization does not support @=: " );
656 }
657 setSize( at->dimension );
658 }
659
660 void setPosition( const Expr * expr ) {
[2890212]661 // need to permit integer-constant-expressions, including: integer constants,
662 // enumeration constants, character constants, sizeof expressions, alignof expressions,
[60aaa51d]663 // cast expressions
[f37d9e7]664
665 auto arg = eval( expr );
666 index = arg.first;
667 return;
668
669 // if ( auto constExpr = dynamic_cast< const ConstantExpr * >( expr ) ) {
670 // try {
671 // index = constExpr->intValue();
672 // } catch ( SemanticErrorException & ) {
673 // SemanticError( expr, "Constant expression of non-integral type in array designator: " );
674 // }
675 // } else if ( auto castExpr = dynamic_cast< const CastExpr * >( expr ) ) {
676 // setPosition( castExpr->arg );
677 // } else if ( dynamic_cast< const SizeofExpr * >( expr ) || dynamic_cast< const AlignofExpr * >( expr ) ) {
678 // index = 0;
679 // } else {
680 // assertf( false, "2 bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
681 // }
[60aaa51d]682 }
683
[2890212]684 void setPosition(
685 std::deque< ptr< Expr > >::const_iterator begin,
[60aaa51d]686 std::deque< ptr< Expr > >::const_iterator end
687 ) override {
688 if ( begin == end ) return;
689
690 setPosition( *begin );
691 memberIter->setPosition( ++begin, end );
692 }
693
694 std::deque< InitAlternative > operator* () const override { return first(); }
695
696 operator bool() const override { return index < size; }
697
698 ArrayIterator & bigStep() override {
699 PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
700 ++index;
701 memberIter.reset( index < size ? createMemberIterator( location, base ) : nullptr );
702 return *this;
703 }
704
705 ArrayIterator & smallStep() override {
706 PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
707 if ( memberIter ) {
708 PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
709 memberIter->smallStep();
710 if ( *memberIter ) {
711 PRINT( std::cerr << "has valid member iter" << std::endl; )
712 return *this;
713 }
714 }
715 return bigStep();
716 }
717
718 const Type * getType() override { return array; }
719
720 const Type * getNext() override { return base; }
721
722 std::deque< InitAlternative > first() const override {
723 PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
724 if ( memberIter && *memberIter ) {
725 std::deque< InitAlternative > ret = memberIter->first();
726 for ( InitAlternative & alt : ret ) {
[f37d9e7]727 alt.designation.get_and_mutate()->designators.emplace_front( ConstantExpr::from_ulong( location, index ) );
[60aaa51d]728 }
729 return ret;
730 }
731 return {};
732 }
733 };
734
735 class AggregateIterator : public MemberIterator {
736 protected:
737 using MemberList = std::vector< ptr< Decl > >;
738
739 CodeLocation location;
740 std::string kind; // for debug
741 std::string name;
742 const Type * inst;
743 const MemberList & members;
744 MemberList::const_iterator curMember;
745 bool atbegin = true; // false at first {small,big}Step
746 const Type * curType = nullptr;
747 std::unique_ptr< MemberIterator > memberIter = nullptr;
748 TypeSubstitution sub;
749
750 bool init() {
751 PRINT( std::cerr << "--init()--" << members.size() << std::endl; )
752 if ( curMember != members.end() ) {
753 if ( auto field = curMember->as< ObjectDecl >() ) {
754 PRINT( std::cerr << "incremented to field: " << field << std::endl; )
755 curType = field->get_type();
756 memberIter.reset( createMemberIterator( location, curType ) );
757 return true;
758 }
759 }
760 return false;
761 }
762
[2890212]763 AggregateIterator(
764 const CodeLocation & loc, const std::string k, const std::string & n, const Type * i,
[60aaa51d]765 const MemberList & ms )
[2890212]766 : location( loc ), kind( k ), name( n ), inst( i ), members( ms ), curMember( ms.begin() ),
[60aaa51d]767 sub( genericSubstitution( i ) ) {
768 PRINT( std::cerr << "Creating " << kind << "(" << name << ")"; )
769 init();
770 }
771
772 public:
[2890212]773 void setPosition(
774 std::deque< ptr< Expr > >::const_iterator begin,
[60aaa51d]775 std::deque< ptr< Expr > >::const_iterator end
776 ) final {
777 if ( begin == end ) return;
778
779 if ( auto varExpr = begin->as< VariableExpr >() ) {
780 for ( curMember = members.begin(); curMember != members.end(); ++curMember ) {
781 if ( *curMember != varExpr->var ) continue;
782
783 ++begin;
784
785 memberIter.reset( createMemberIterator( location, varExpr->result ) );
786 curType = varExpr->result;
787 atbegin = curMember == members.begin() && begin == end;
788 memberIter->setPosition( begin, end );
789 return;
790 }
[f37d9e7]791 assertf( false, "could not find member in %s: %s", kind.c_str(), toString( varExpr ).c_str() );
[60aaa51d]792 } else {
[f37d9e7]793 assertf( false, "1 bad designator given to %s: %s", kind.c_str(), toString( *begin ).c_str() );
[60aaa51d]794 }
795 }
796
797 std::deque< InitAlternative > operator* () const final {
798 if ( memberIter && *memberIter ) {
799 std::deque< InitAlternative > ret = memberIter->first();
800 PRINT( std::cerr << "sub: " << sub << std::endl; )
801 for ( InitAlternative & alt : ret ) {
802 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
803 alt.designation.get_and_mutate()->designators.emplace_front(
804 new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
805 // need to substitute for generic types so that casts are to concrete types
[8e1467d]806 alt.type = shallowCopy(alt.type.get());
[60aaa51d]807 PRINT( std::cerr << " type is: " << alt.type; )
808 sub.apply( alt.type ); // also apply to designation??
809 PRINT( std::cerr << " ==> " << alt.type << std::endl; )
810 }
811 return ret;
812 }
813 return {};
814 }
815
816 AggregateIterator & smallStep() final {
817 PRINT( std::cerr << "smallStep in " << kind << std::endl; )
818 atbegin = false;
819 if ( memberIter ) {
820 PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
821 memberIter->smallStep();
822 if ( *memberIter ) {
823 PRINT( std::cerr << "success!" << std::endl; )
824 return *this;
825 }
826 }
827 return bigStep();
828 }
829
830 AggregateIterator & bigStep() override = 0;
831
832 const Type * getType() final { return inst; }
833
834 const Type * getNext() final {
835 return ( memberIter && *memberIter ) ? memberIter->getType() : nullptr;
836 }
837
838 std::deque< InitAlternative > first() const final {
839 std::deque< InitAlternative > ret;
840 PRINT( std::cerr << "first " << kind << std::endl; )
841 if ( memberIter && *memberIter ) {
842 PRINT( std::cerr << "adding children" << std::endl; )
843 ret = memberIter->first();
844 for ( InitAlternative & alt : ret ) {
845 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
[2890212]846 alt.designation.get_and_mutate()->designators.emplace_front(
[60aaa51d]847 new VariableExpr{ location, curMember->strict_as< ObjectDecl >() } );
848 }
849 }
850 if ( atbegin ) {
851 // only add self if at the very beginning of the structure
852 PRINT( std::cerr << "adding self" << std::endl; )
853 ret.emplace_front( inst, new Designation{ location } );
854 }
855 return ret;
856 }
857 };
858
859 class StructIterator final : public AggregateIterator {
860 public:
861 StructIterator( const CodeLocation & loc, const StructInstType * inst )
862 : AggregateIterator( loc, "StructIterator", inst->name, inst, inst->base->members ) {}
863
864 operator bool() const override {
865 return curMember != members.end() || (memberIter && *memberIter);
866 }
867
868 StructIterator & bigStep() override {
869 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
870 atbegin = false;
871 memberIter = nullptr;
872 curType = nullptr;
873 while ( curMember != members.end() ) {
874 ++curMember;
875 if ( init() ) return *this;
876 }
877 return *this;
878 }
879 };
880
881 class UnionIterator final : public AggregateIterator {
882 public:
883 UnionIterator( const CodeLocation & loc, const UnionInstType * inst )
884 : AggregateIterator( loc, "UnionIterator", inst->name, inst, inst->base->members ) {}
885
886 operator bool() const override { return memberIter && *memberIter; }
887
888 UnionIterator & bigStep() override {
889 // unions only initialize one member
890 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
891 atbegin = false;
892 memberIter = nullptr;
893 curType = nullptr;
894 curMember = members.end();
895 return *this;
896 }
897 };
898
899 class TupleIterator final : public AggregateIterator {
900 public:
[2890212]901 TupleIterator( const CodeLocation & loc, const TupleType * inst )
902 : AggregateIterator(
903 loc, "TupleIterator", toString("Tuple", inst->size()), inst, inst->members
[60aaa51d]904 ) {}
905
906 operator bool() const override {
907 return curMember != members.end() || (memberIter && *memberIter);
908 }
909
910 TupleIterator & bigStep() override {
911 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
912 atbegin = false;
913 memberIter = nullptr;
914 curType = nullptr;
915 while ( curMember != members.end() ) {
916 ++curMember;
917 if ( init() ) return *this;
918 }
919 return *this;
920 }
921 };
922
923 MemberIterator * createMemberIterator( const CodeLocation & loc, const Type * type ) {
[98e8b3b]924 if ( auto aggr = dynamic_cast< const BaseInstType * >( type ) ) {
[60aaa51d]925 if ( auto sit = dynamic_cast< const StructInstType * >( aggr ) ) {
[de57af9]926 assert( sit->base );
[60aaa51d]927 return new StructIterator{ loc, sit };
928 } else if ( auto uit = dynamic_cast< const UnionInstType * >( aggr ) ) {
[de57af9]929 assert( uit->base );
[60aaa51d]930 return new UnionIterator{ loc, uit };
931 } else {
[2890212]932 assertf(
933 dynamic_cast< const EnumInstType * >( type )
934 || dynamic_cast< const TypeInstType * >( type ),
[98e8b3b]935 "Encountered unhandled BaseInstType in createMemberIterator: %s",
[60aaa51d]936 toString( type ).c_str() );
937 return new SimpleIterator{ loc, type };
938 }
939 } else if ( auto at = dynamic_cast< const ArrayType * >( type ) ) {
940 return new ArrayIterator{ loc, at };
941 } else if ( auto tt = dynamic_cast< const TupleType * >( type ) ) {
942 return new TupleIterator{ loc, tt };
943 } else {
944 return new SimpleIterator{ loc, type };
945 }
946 }
947
[2b59f55]948 CurrentObject::CurrentObject( const CodeLocation & loc, const Type * type ) : objStack() {
949 objStack.emplace_back( new SimpleIterator{ loc, type } );
[b7d92b96]950 }
951
[2d11663]952 const Designation * CurrentObject::findNext( const Designation * designation ) {
953 using DesignatorChain = std::deque< ptr< Expr > >;
954 PRINT( std::cerr << "___findNext" << std::endl; )
[2890212]955
[2d11663]956 // find all the d's
957 std::vector< DesignatorChain > desigAlts{ {} }, newDesigAlts;
958 std::deque< const Type * > curTypes{ objStack.back()->getType() }, newTypes;
959 for ( const Expr * expr : designation->designators ) {
960 PRINT( std::cerr << "____untyped: " << expr << std::endl; )
961 auto dit = desigAlts.begin();
962 if ( auto nexpr = dynamic_cast< const NameExpr * >( expr ) ) {
963 for ( const Type * t : curTypes ) {
964 assert( dit != desigAlts.end() );
965
966 DesignatorChain & d = *dit;
967 PRINT( std::cerr << "____actual: " << t << std::endl; )
[98e8b3b]968 if ( auto refType = dynamic_cast< const BaseInstType * >( t ) ) {
[2d11663]969 // concatenate identical field names
970 for ( const Decl * mem : refType->lookup( nexpr->name ) ) {
971 if ( auto field = dynamic_cast< const ObjectDecl * >( mem ) ) {
972 PRINT( std::cerr << "____alt: " << field->type << std::endl; )
973 DesignatorChain d2 = d;
974 d2.emplace_back( new VariableExpr{ expr->location, field } );
975 newDesigAlts.emplace_back( std::move( d2 ) );
976 newTypes.emplace_back( field->type );
977 }
978 }
979 }
980
981 ++dit;
982 }
983 } else {
984 for ( const Type * t : curTypes ) {
985 assert( dit != desigAlts.end() );
986
987 DesignatorChain & d = *dit;
988 if ( auto at = dynamic_cast< const ArrayType * >( t ) ) {
989 PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
990 d.emplace_back( expr );
991 newDesigAlts.emplace_back( d );
992 newTypes.emplace_back( at->base );
993 }
994 }
995 }
996
997 // reset queue
998 desigAlts = std::move( newDesigAlts );
999 newDesigAlts.clear();
1000 curTypes = std::move( newTypes );
1001 newTypes.clear();
1002 assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%zu) and current types (%zu) out of sync", desigAlts.size(), curTypes.size() );
1003 }
1004
1005 if ( desigAlts.size() > 1 ) {
1006 SemanticError( designation, toString("Too many alternatives (", desigAlts.size(), ") for designation: ") );
1007 } else if ( desigAlts.empty() ) {
1008 SemanticError( designation, "No reasonable alternatives for designation: " );
1009 }
1010
1011 DesignatorChain & d = desigAlts.back();
1012 PRINT( for ( Expression * expr : d ) {
1013 std::cerr << "____desig: " << expr << std::endl;
1014 } ) // for
1015 assertf( ! curTypes.empty(), "empty designator chosen");
1016
1017 // set new designators
1018 assertf( ! objStack.empty(), "empty object stack when setting designation" );
[2890212]1019 Designation * actualDesignation =
[2d11663]1020 new Designation{ designation->location, DesignatorChain{d} };
1021 objStack.back()->setPosition( d ); // destroys d
1022 return actualDesignation;
1023 }
1024
1025 void CurrentObject::setNext( const Designation * designation ) {
[60aaa51d]1026 PRINT( std::cerr << "____setNext" << designation << std::endl; )
1027 assertf( ! objStack.empty(), "obj stack empty in setNext" );
1028 objStack.back()->setPosition( designation->designators );
1029 }
1030
1031 void CurrentObject::increment() {
1032 PRINT( std::cerr << "____increment" << std::endl; )
1033 if ( objStack.empty() ) return;
1034 PRINT( std::cerr << *objStack.back() << std::endl; )
1035 objStack.back()->smallStep();
1036 }
1037
1038 void CurrentObject::enterListInit( const CodeLocation & loc ) {
1039 PRINT( std::cerr << "____entering list init" << std::endl; )
1040 assertf( ! objStack.empty(), "empty obj stack entering list init" );
1041 const ast::Type * type = objStack.back()->getNext();
1042 assert( type );
1043 objStack.emplace_back( createMemberIterator( loc, type ) );
1044 }
1045
1046 void CurrentObject::exitListInit() {
1047 PRINT( std::cerr << "____exiting list init" << std::endl; )
1048 assertf( ! objStack.empty(), "objstack empty" );
1049 objStack.pop_back();
1050 if ( ! objStack.empty() ) {
1051 PRINT( std::cerr << *objStack.back() << std::endl; )
1052 objStack.back()->bigStep();
1053 }
1054 }
1055
1056 std::deque< InitAlternative > CurrentObject::getOptions() {
[2b59f55]1057 PRINT( std::cerr << "____getting current options" << std::endl; )
1058 assertf( ! objStack.empty(), "objstack empty in getOptions" );
1059 return **objStack.back();
1060 }
[60aaa51d]1061
1062 const Type * CurrentObject::getCurrentType() {
1063 PRINT( std::cerr << "____getting current type" << std::endl; )
1064 assertf( ! objStack.empty(), "objstack empty in getCurrentType" );
1065 return objStack.back()->getNext();
1066 }
[b7d92b96]1067}
1068
[e4d829b]1069// Local Variables: //
1070// tab-width: 4 //
1071// mode: c++ //
1072// compile-command: "make install" //
1073// End: //
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