source: src/ResolvExpr/CurrentObject.cc@ 579263a

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 579263a was e4d829b, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

major effort on designations, works in many cases
  • Property mode set to 100644
File size: 18.5 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 <stack>
17#include <iostream>
18
19#include "CurrentObject.h"
20
21#include "SynTree/Declaration.h"
22#include "SynTree/Initializer.h"
23#include "SynTree/Type.h"
24
25#if 0
26#define PRINT(x) x
27#else
28#define PRINT(x)
29#endif
30
31namespace ResolvExpr {
32 long long int getConstValue( ConstantExpr * constExpr ) {
33 if ( BasicType * basicType = dynamic_cast< BasicType * >( constExpr->get_result() ) ) {
34 if ( basicType->get_kind() == BasicType::Char || basicType->get_kind() == BasicType::SignedChar || basicType->get_kind() == BasicType::UnsignedChar ) {
35 assertf( constExpr->get_constant()->get_value().size() == 3, "constant value with unusual length: %s", constExpr->get_constant()->get_value().c_str() );
36 return constExpr->get_constant()->get_value()[1];
37 } else {
38 return stoll( constExpr->get_constant()->get_value() );
39 }
40 } else {
41 assertf( false, "unhandled type on getConstValue %s", constExpr->get_result() );
42 }
43 }
44
45 struct Indenter {
46 static const int amt = 2;
47 unsigned int indent = 0;
48
49 Indenter & operator+=(int nlevels) { indent += amt*nlevels; return *this; }
50 Indenter & operator-=(int nlevels) { indent -= amt*nlevels; return *this; }
51 Indenter operator+(int nlevels) { Indenter indenter = *this; return indenter += nlevels; }
52 Indenter operator-(int nlevels) { Indenter indenter = *this; return indenter -= nlevels; }
53 Indenter & operator++() { return *this += 1; }
54 Indenter & operator--() { return *this -= 1; }
55 };
56 std::ostream & operator<<( std::ostream & out, Indenter & indent ) {
57 return out << std::string(indent.indent, ' ');
58 }
59
60 class MemberIterator {
61 public:
62 virtual ~MemberIterator() {}
63
64 virtual void setPosition( std::list< Expression * > & designators ) = 0;
65 virtual std::list<InitAlternative> operator*() const = 0;
66 virtual operator bool() const = 0;
67 virtual MemberIterator & bigStep() = 0;
68 virtual MemberIterator & smallStep() = 0;
69 virtual Type * getType() = 0;
70 virtual Type * getNext() = 0;
71
72 virtual void print( std::ostream & out, Indenter indent ) const = 0;
73
74 virtual std::list<InitAlternative> first() const = 0; // should be protected
75 };
76
77 std::ostream & operator<<(std::ostream & out, const MemberIterator & it) {
78 Indenter indenter;
79 it.print( out, indenter );
80 return out;
81 }
82
83 /// create a new MemberIterator that traverses a type correctly
84 MemberIterator * createMemberIterator( Type * type );
85
86 /// iterates "other" types, e.g. basic types, pointer types, etc. which do not change at list initializer entry
87 class SimpleIterator : public MemberIterator {
88 public:
89 SimpleIterator( Type * type ) : type( type ) {}
90
91 virtual void setPosition( std::list< Expression * > & designators ) {
92 assertf( designators.empty(), "simple iterator given non-empty designator..." ); // xxx - might be semantic error
93 }
94
95 virtual std::list<InitAlternative> operator*() const { return first(); }
96 virtual operator bool() const { return type; }
97
98 // big step is the same as small step
99 virtual MemberIterator & bigStep() { return smallStep(); }
100 virtual MemberIterator & smallStep() {
101 type = nullptr; // type is nullified on increment since SimpleIterators do not have members
102 return *this;
103 }
104
105 virtual void print( std::ostream & out, Indenter indent ) const {
106 out << "SimpleIterator(" << type << ")";
107 }
108
109 virtual Type * getType() { return type; }
110 virtual Type * getNext() { return type; }
111
112 protected:
113 virtual std::list<InitAlternative> first() const {
114 if ( type ) return std::list<InitAlternative>{ { type->clone(), new Designation( {} ) } };
115 else return std::list<InitAlternative>{};
116 }
117 private:
118 Type * type = nullptr;
119 };
120
121 class ArrayIterator : public MemberIterator {
122 public:
123 ArrayIterator( ArrayType * at ) : array( at ) {
124 PRINT( std::cerr << "Creating array iterator: " << at << std::endl; )
125 base = at->get_base();
126 memberIter = createMemberIterator( base );
127 setSize( at->get_dimension() );
128 }
129
130 ~ArrayIterator() {
131 delete memberIter;
132 }
133
134 private:
135 void setSize( Expression * expr ) {
136 if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
137 size = getConstValue( constExpr ); // 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
138 PRINT( std::cerr << "array type with size: " << size << std::endl; )
139 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
140 setSize( castExpr->get_arg() );
141 } else {
142 assertf( false, "unhandled expression in setSize: %s", toString( expr ).c_str() );
143 }
144 }
145
146 public:
147 void setPosition( Expression * expr ) {
148 // need to permit integer-constant-expressions, including: integer constants, enumeration constants, character constants, sizeof expressions, _Alignof expressions, cast expressions
149 if ( ConstantExpr * constExpr = dynamic_cast< ConstantExpr * >( expr ) ) {
150 index = getConstValue( constExpr );
151 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
152 setPosition( castExpr->get_arg() );
153 } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
154 assertf( dynamic_cast<EnumInstType *> ( varExpr->get_result() ), "ArrayIterator given variable that isn't an enum constant", toString( expr ).c_str() );
155 index = 0; // xxx - get actual value of enum constant
156 } else if ( dynamic_cast< SizeofExpr * >( expr ) || dynamic_cast< AlignofExpr * >( expr ) ) {
157 index = 0; // xxx - get actual sizeof/alignof value?
158 } else {
159 assertf( false, "bad designator given to ArrayIterator: %s", toString( expr ).c_str() );
160 }
161 }
162
163 virtual void setPosition( std::list< Expression * > & designators ) {
164 if ( ! designators.empty() ) {
165 setPosition( designators.front() );
166 designators.pop_front();
167 memberIter->setPosition( designators );
168 }
169 }
170
171 virtual std::list<InitAlternative> operator*() const {
172 return first();
173 }
174
175 virtual operator bool() const { return index < size; }
176
177 virtual MemberIterator & bigStep() {
178 PRINT( std::cerr << "bigStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
179 ++index;
180 delete memberIter;
181 if ( index < size ) memberIter = createMemberIterator( base );
182 else memberIter = nullptr;
183 return *this;
184 }
185
186 virtual MemberIterator & smallStep() {
187 PRINT( std::cerr << "smallStep in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
188 if ( memberIter ) {
189 PRINT( std::cerr << "has member iter: " << *memberIter << std::endl; )
190 memberIter->smallStep();
191 if ( *memberIter ) {
192 PRINT( std::cerr << "has valid member iter" << std::endl; )
193 return *this;
194 }
195 }
196 return bigStep();
197 }
198
199 virtual Type * getType() { return array; }
200 virtual Type * getNext() { return base; }
201
202 virtual std::list<InitAlternative> first() const {
203 PRINT( std::cerr << "first in ArrayIterator (" << index << "/" << size << ")" << std::endl; )
204 if ( memberIter && *memberIter ) {
205 std::list<InitAlternative> ret = memberIter->first();
206 for ( InitAlternative & alt : ret ) {
207 alt.designation->get_designators().push_front( new ConstantExpr( Constant::from_ulong( index ) ) );
208 }
209 return ret;
210 }
211 return std::list<InitAlternative>();
212 }
213
214 virtual void print( std::ostream & out, Indenter indent ) const {
215 out << "ArrayIterator(Array of " << base << ")";
216 if ( memberIter ) {
217 Indenter childIndent = indent+1;
218 out << std::endl << childIndent;
219 memberIter->print( out, childIndent );
220 }
221 }
222
223 private:
224 ArrayType * array = nullptr;
225 Type * base = nullptr;
226 size_t index = 0;
227 size_t size = 0;
228 MemberIterator * memberIter = nullptr;
229 };
230
231 class AggregateIterator : public MemberIterator {
232 public:
233 typedef std::list<Declaration *>::iterator iterator;
234 const char * kind = ""; // for debug
235 ReferenceToType * inst = nullptr;
236 AggregateDecl * decl = nullptr;
237 iterator curMember;
238 bool atbegin = true; // false at first {small,big}Step -- this struct type is only added to the possibilities at the beginning
239 Type * curType = nullptr;
240 MemberIterator * memberIter = nullptr;
241
242 AggregateIterator( const char * kind, ReferenceToType * inst, AggregateDecl * decl ) : kind( kind ), inst( inst ), decl( decl ), curMember( decl->get_members().begin() ) {
243 init();
244 }
245
246 virtual ~AggregateIterator() {
247 delete memberIter;
248 }
249
250 bool init() {
251 PRINT( std::cerr << "--init()--" << std::endl; )
252 if ( curMember != decl->get_members().end() ) {
253 if ( ObjectDecl * field = dynamic_cast< ObjectDecl * >( *curMember ) ) {
254 PRINT( std::cerr << "incremented to field: " << field << std::endl; )
255 curType = field->get_type();
256 memberIter = createMemberIterator( curType );
257 return true;
258 }
259 }
260 return false;
261 }
262
263 virtual std::list<InitAlternative> operator*() const {
264 if (memberIter && *memberIter) {
265 std::list<InitAlternative> ret = memberIter->first();
266 for ( InitAlternative & alt : ret ) {
267 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
268 alt.designation->get_designators().push_front( new VariableExpr( safe_dynamic_cast< ObjectDecl * >( *curMember ) ) );
269 }
270 return ret;
271 }
272 return std::list<InitAlternative>();
273 }
274
275 virtual void setPosition( std::list< Expression * > & designators ) {
276 if ( ! designators.empty() ) {
277 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( designators.front() ) ) {
278 for ( curMember = decl->get_members().begin(); curMember != decl->get_members().end(); ++curMember ) {
279 if ( *curMember == varExpr->get_var() ) {
280 designators.pop_front();
281 delete memberIter;
282 memberIter = createMemberIterator( varExpr->get_result() );
283 curType = varExpr->get_result();
284 atbegin = curMember == decl->get_members().begin() && designators.empty(); // xxx - is this right??
285 memberIter->setPosition( designators );
286 return;
287 } // if
288 } // for
289 assertf( false, "could not find member in %s: %s", kind, toString( varExpr ).c_str() );
290 } else {
291 assertf( false, "bad designator given to %s: %s", kind, toString( designators.front() ).c_str() );
292 } // if
293 } // if
294 }
295
296 virtual MemberIterator & smallStep() {
297 PRINT( std::cerr << "smallStep in " << kind << std::endl; )
298 atbegin = false;
299 if ( memberIter ) {
300 PRINT( std::cerr << "has member iter, incrementing..." << std::endl; )
301 memberIter->smallStep();
302 if ( *memberIter ) {
303 PRINT( std::cerr << "success!" << std::endl; )
304 return *this;
305 }
306 }
307 return bigStep();
308 }
309
310 virtual Type * getType() { return inst; }
311 virtual Type * getNext() {
312 if ( memberIter && *memberIter ) return memberIter->getType(); // xxx - ??? recursive call???
313 return nullptr;
314 }
315
316 virtual std::list<InitAlternative> first() const {
317 std::list<InitAlternative> ret;
318 PRINT( std::cerr << "first " << kind << std::endl; )
319 if ( memberIter && *memberIter ) { // might not need *memberIter??
320 PRINT( std::cerr << "adding children" << std::endl; )
321 ret = memberIter->first();
322 for ( InitAlternative & alt : ret ) {
323 PRINT( std::cerr << "iterating and adding designators" << std::endl; )
324 alt.designation->get_designators().push_front( new VariableExpr( safe_dynamic_cast< ObjectDecl * >( *curMember ) ) );
325 }
326 }
327 // if ( curMember == std::next( decl->get_members().begin(), 1 ) ) { // xxx - this never triggers because curMember is incremented immediately on construction
328 if ( atbegin ) { // xxx - this never triggers because curMember is incremented immediately on construction
329 // xxx - what about case of empty struct??
330 // only add self if at the very beginning of the structure
331 PRINT( std::cerr << "adding self" << std::endl; )
332 ret.push_front( { inst->clone(), new Designation( {} ) } );
333 }
334 return ret;
335 }
336
337 virtual void print( std::ostream & out, Indenter indent ) const {
338 out << kind << "(" << decl->get_name() << ")";
339 if ( memberIter ) {
340 Indenter childIndent = indent+1;
341 out << std::endl << childIndent;
342 memberIter->print( out, childIndent );
343 }
344 }
345 };
346
347 class UnionIterator : public AggregateIterator {
348 public:
349 UnionIterator( UnionInstType * inst ) : AggregateIterator( "UnionIterator", inst, inst->get_baseUnion() ) {}
350
351 virtual operator bool() const { return (memberIter && *memberIter); }
352 virtual MemberIterator & bigStep() {
353 // unions only initialize one member
354 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
355 atbegin = false;
356 delete memberIter;
357 memberIter = nullptr;
358 curType = nullptr;
359 curMember = decl->get_members().end();
360 return *this;
361 }
362 virtual std::list<InitAlternative> first() const { return std::list<InitAlternative>{}; }
363 };
364
365 class StructIterator : public AggregateIterator {
366 public:
367 StructIterator( StructInstType * inst ) : AggregateIterator( "StructIterator", inst, inst->get_baseStruct() ) {}
368
369 virtual operator bool() const { return curMember != decl->get_members().end() || (memberIter && *memberIter); }
370
371 virtual MemberIterator & bigStep() {
372 PRINT( std::cerr << "bigStep in " << kind << std::endl; )
373 atbegin = false;
374 delete memberIter;
375 memberIter = nullptr;
376 curType = nullptr;
377 for ( ; curMember != decl->get_members().end(); ) {
378 ++curMember;
379 if ( init() ) {
380 return *this;
381 }
382 }
383 return *this;
384 }
385 };
386
387 MemberIterator * createMemberIterator( Type * type ) {
388 if ( ReferenceToType * aggr = dynamic_cast< ReferenceToType * >( type ) ) {
389 if ( StructInstType * sit = dynamic_cast< StructInstType * >( aggr ) ) {
390 return new StructIterator( sit );
391 } else if ( UnionInstType * uit = dynamic_cast< UnionInstType * >( aggr ) ) {
392 return new UnionIterator( uit );
393 } else {
394 assertf( false, "some other reftotype" );
395 }
396 } else if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
397 return new ArrayIterator( at );
398 } else {
399 return new SimpleIterator( type );
400 }
401 }
402
403 CurrentObject::CurrentObject() {}
404 CurrentObject::CurrentObject( Type * type ) {
405 objStack.push( new SimpleIterator( type ) );
406 }
407
408
409 void CurrentObject::setNext( Designation * designation ) {
410 assertf( ! objStack.empty(), "obj stack empty in setNext" );
411 PRINT( std::cerr << "____setNext" << designation << std::endl; )
412 objStack.top()->setPosition( designation->get_designators() );
413 }
414
415 Designation * CurrentObject::findNext( Designation * designation ) {
416 typedef std::list< Expression * > DesignatorChain;
417 PRINT( std::cerr << "___findNext" << std::endl; )
418 // find all the d's
419 std::list<DesignatorChain> desigAlts{ { } }, newDesigAlts;
420 std::list<Type *> curTypes { (objStack.top())->getType() }, newTypes;
421 for ( Expression * expr : designation->get_designators() ) {
422 PRINT( std::cerr << "____untyped: " << expr << std::endl; )
423 std::list<DesignatorChain>::iterator dit = desigAlts.begin();
424 if ( NameExpr * nexpr = dynamic_cast<NameExpr *>(expr) ) {
425 for ( Type * t : curTypes ) {
426 assert( dit != desigAlts.end() );
427 DesignatorChain & d = *dit;
428 PRINT( std::cerr << "____actual: " << t << std::endl; )
429 ReferenceToType * refType = dynamic_cast<ReferenceToType *>(t);
430 std::list<Declaration *> members;
431 if ( refType ) {
432 refType->lookup( nexpr->get_name(), members ); // concatenate identical field name
433 // xxx - need to also include anonymous members in this somehow...
434 for ( Declaration * mem: members ) {
435 if ( ObjectDecl * field = dynamic_cast<ObjectDecl *>(mem) ) {
436 PRINT( std::cerr << "____alt: " << field->get_type() << std::endl; )
437 DesignatorChain newD = d;
438 newD.push_back( new VariableExpr( field ) );
439 newDesigAlts.push_back( newD );
440 newTypes.push_back( field->get_type() );
441 } // if
442 } // for
443 } // if
444 ++dit;
445 } // for
446 } else {
447 for ( Type * t : curTypes ) {
448 assert( dit != desigAlts.end() );
449 DesignatorChain & d = *dit;
450 if ( ArrayType * at = dynamic_cast< ArrayType * > ( t ) ) {
451 PRINT( std::cerr << "____alt: " << at->get_base() << std::endl; )
452 d.push_back( expr );
453 newDesigAlts.push_back( d );
454 newTypes.push_back( at->get_base() );
455 }
456 ++dit;
457 } // for
458 } // if
459 desigAlts = newDesigAlts;
460 newDesigAlts.clear();
461 curTypes = newTypes;
462 newTypes.clear();
463 assertf( desigAlts.size() == curTypes.size(), "Designator alternatives (%d) and current types (%d) out of sync", desigAlts.size(), curTypes.size() );
464 } // for
465 if ( desigAlts.size() > 1 ) {
466 throw SemanticError( toString("Too many alternatives (", desigAlts.size(), ") for designation: "), designation );
467 } else if ( desigAlts.size() == 0 ) {
468 throw SemanticError( "No reasonable alternatives for designation: ", designation );
469 }
470 DesignatorChain & d = desigAlts.back();
471 PRINT( for ( Expression * expr : d ) {
472 std::cerr << "____desig: " << expr << std::endl;
473 } ) // for
474 assertf( ! curTypes.empty(), "empty designator chosen");
475
476 // set new designators
477 assertf( ! objStack.empty(), "empty object stack when setting designation" );
478 Designation * actualDesignation = new Designation( d );
479 objStack.top()->setPosition( d ); // destroys d
480 return actualDesignation;
481 }
482
483 void CurrentObject::increment() {
484 PRINT( std::cerr << "____increment" << std::endl; )
485 if ( ! objStack.empty() ) {
486 PRINT( std::cerr << *objStack.top() << std::endl; )
487 objStack.top()->smallStep();
488 }
489 }
490
491 void CurrentObject::enterListInit() {
492 PRINT( std::cerr << "____entering list init" << std::endl; )
493 assertf( ! objStack.empty(), "empty obj stack entering list init" );
494 Type * type = objStack.top()->getNext();
495 if ( type ) {
496 // xxx - record types.front()?
497 objStack.push( createMemberIterator( type ) );
498 } else {
499 assertf( false, "not sure about this case..." );
500 }
501 }
502
503 void CurrentObject::exitListInit() {
504 PRINT( std::cerr << "____exiting list init" << std::endl; )
505 assertf( ! objStack.empty(), "objstack empty" );
506 delete objStack.top();
507 objStack.pop();
508 if ( ! objStack.empty() ) {
509 PRINT( std::cerr << *objStack.top() << std::endl; )
510 objStack.top()->bigStep();
511 }
512 }
513
514 std::list< InitAlternative > CurrentObject::getOptions() {
515 PRINT( std::cerr << "____getting current options" << std::endl; )
516 assertf( ! objStack.empty(), "objstack empty in getOptions" );
517 return **objStack.top();
518 }
519} // namespace ResolvExpr
520
521// Local Variables: //
522// tab-width: 4 //
523// mode: c++ //
524// compile-command: "make install" //
525// End: //
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