source: src/ResolvExpr/Unify.cc@ dc86541

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 dc86541 was 23b6643f, checked in by Rob Schluntz <rschlunt@…>, 9 years ago

Merge branch 'master' into tuples

Conflicts:

src/Makefile.in
src/ResolvExpr/Unify.cc
src/SynTree/Type.h
  • Property mode set to 100644
File size: 24.7 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// Unify.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Sun May 17 12:27:10 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Wed Mar 2 17:37:05 2016
13// Update Count : 37
14//
15
16#include <set>
17#include <memory>
18
19#include "Unify.h"
20#include "TypeEnvironment.h"
21#include "typeops.h"
22#include "FindOpenVars.h"
23#include "SynTree/Visitor.h"
24#include "SynTree/Type.h"
25#include "SynTree/Declaration.h"
26#include "SymTab/Indexer.h"
27#include "Common/utility.h"
28
29
30// #define DEBUG
31
32namespace ResolvExpr {
33 struct WidenMode {
34 WidenMode( bool widenFirst, bool widenSecond ): widenFirst( widenFirst ), widenSecond( widenSecond ) {}
35 WidenMode &operator|=( const WidenMode &other ) { widenFirst |= other.widenFirst; widenSecond |= other.widenSecond; return *this; }
36 WidenMode &operator&=( const WidenMode &other ) { widenFirst &= other.widenFirst; widenSecond &= other.widenSecond; return *this; }
37 WidenMode operator|( const WidenMode &other ) { WidenMode newWM( *this ); newWM |= other; return newWM; }
38 WidenMode operator&( const WidenMode &other ) { WidenMode newWM( *this ); newWM &= other; return newWM; }
39 operator bool() { return widenFirst && widenSecond; }
40
41 bool widenFirst : 1, widenSecond : 1;
42 };
43
44 class Unify : public Visitor {
45 public:
46 Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer );
47
48 bool get_result() const { return result; }
49 private:
50 virtual void visit(VoidType *voidType);
51 virtual void visit(BasicType *basicType);
52 virtual void visit(PointerType *pointerType);
53 virtual void visit(ArrayType *arrayType);
54 virtual void visit(FunctionType *functionType);
55 virtual void visit(StructInstType *aggregateUseType);
56 virtual void visit(UnionInstType *aggregateUseType);
57 virtual void visit(EnumInstType *aggregateUseType);
58 virtual void visit(TraitInstType *aggregateUseType);
59 virtual void visit(TypeInstType *aggregateUseType);
60 virtual void visit(TupleType *tupleType);
61 virtual void visit(VarArgsType *varArgsType);
62 virtual void visit(ZeroType *zeroType);
63 virtual void visit(OneType *oneType);
64
65 template< typename RefType > void handleRefType( RefType *inst, Type *other );
66 template< typename RefType > void handleGenericRefType( RefType *inst, Type *other );
67
68 bool result;
69 Type *type2; // inherited
70 TypeEnvironment &env;
71 AssertionSet &needAssertions;
72 AssertionSet &haveAssertions;
73 const OpenVarSet &openVars;
74 WidenMode widenMode;
75 Type *commonType;
76 const SymTab::Indexer &indexer;
77 };
78
79 /// Attempts an inexact unification of type1 and type2.
80 /// Returns false if no such unification; if the types can be unified, sets common (unless they unify exactly and have identical type qualifiers)
81 bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common );
82 bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer );
83
84 bool typesCompatible( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
85 TypeEnvironment newEnv;
86 OpenVarSet openVars, closedVars; // added closedVars
87 AssertionSet needAssertions, haveAssertions;
88 Type *newFirst = first->clone(), *newSecond = second->clone();
89 env.apply( newFirst );
90 env.apply( newSecond );
91
92 // do we need to do this? Seems like we do, types should be able to be compatible if they
93 // have free variables that can unify
94 findOpenVars( newFirst, openVars, closedVars, needAssertions, haveAssertions, false );
95 findOpenVars( newSecond, openVars, closedVars, needAssertions, haveAssertions, true );
96
97 bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer );
98 delete newFirst;
99 delete newSecond;
100 return result;
101 }
102
103 bool typesCompatibleIgnoreQualifiers( Type *first, Type *second, const SymTab::Indexer &indexer, const TypeEnvironment &env ) {
104 TypeEnvironment newEnv;
105 OpenVarSet openVars;
106 AssertionSet needAssertions, haveAssertions;
107 Type *newFirst = first->clone(), *newSecond = second->clone();
108 env.apply( newFirst );
109 env.apply( newSecond );
110 newFirst->get_qualifiers() = Type::Qualifiers();
111 newSecond->get_qualifiers() = Type::Qualifiers();
112/// std::cout << "first is ";
113/// first->print( std::cout );
114/// std::cout << std::endl << "second is ";
115/// second->print( std::cout );
116/// std::cout << std::endl << "newFirst is ";
117/// newFirst->print( std::cout );
118/// std::cout << std::endl << "newSecond is ";
119/// newSecond->print( std::cout );
120/// std::cout << std::endl;
121 bool result = unifyExact( newFirst, newSecond, newEnv, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer );
122 delete newFirst;
123 delete newSecond;
124 return result;
125 }
126
127 bool isFtype( Type *type, const SymTab::Indexer &indexer ) {
128 if ( dynamic_cast< FunctionType* >( type ) ) {
129 return true;
130 } else if ( TypeInstType *typeInst = dynamic_cast< TypeInstType* >( type ) ) {
131 return typeInst->get_isFtype();
132 } // if
133 return false;
134 }
135
136 bool tyVarCompatible( TypeDecl::Kind kind, Type *type, const SymTab::Indexer &indexer ) {
137 switch ( kind ) {
138 case TypeDecl::Any:
139 case TypeDecl::Dtype:
140 return ! isFtype( type, indexer );
141
142 case TypeDecl::Ftype:
143 return isFtype( type, indexer );
144 } // switch
145 assert( false );
146 return false;
147 }
148
149 bool bindVar( TypeInstType *typeInst, Type *other, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) {
150 OpenVarSet::const_iterator tyvar = openVars.find( typeInst->get_name() );
151 assert( tyvar != openVars.end() );
152 if ( ! tyVarCompatible( tyvar->second, other, indexer ) ) {
153 return false;
154 } // if
155 if ( occurs( other, typeInst->get_name(), env ) ) {
156 return false;
157 } // if
158 EqvClass curClass;
159 if ( env.lookup( typeInst->get_name(), curClass ) ) {
160 if ( curClass.type ) {
161 Type *common = 0;
162 // attempt to unify equivalence class type (which has qualifiers stripped, so they must be restored) with the type to bind to
163 std::auto_ptr< Type > newType( curClass.type->clone() );
164 newType->get_qualifiers() = typeInst->get_qualifiers();
165 if ( unifyInexact( newType.get(), other, env, needAssertions, haveAssertions, openVars, widenMode & WidenMode( curClass.allowWidening, true ), indexer, common ) ) {
166 if ( common ) {
167 common->get_qualifiers() = Type::Qualifiers();
168 delete curClass.type;
169 curClass.type = common;
170 env.add( curClass );
171 } // if
172 return true;
173 } else {
174 return false;
175 } // if
176 } else {
177 curClass.type = other->clone();
178 curClass.type->get_qualifiers() = Type::Qualifiers();
179 curClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond;
180 env.add( curClass );
181 } // if
182 } else {
183 EqvClass newClass;
184 newClass.vars.insert( typeInst->get_name() );
185 newClass.type = other->clone();
186 newClass.type->get_qualifiers() = Type::Qualifiers();
187 newClass.allowWidening = widenMode.widenFirst && widenMode.widenSecond;
188 newClass.kind = kind;
189 env.add( newClass );
190 } // if
191 return true;
192 }
193
194 bool bindVarToVar( TypeInstType *var1, TypeInstType *var2, TypeDecl::Kind kind, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) {
195 bool result = true;
196 EqvClass class1, class2;
197 bool hasClass1 = false, hasClass2 = false;
198 bool widen1 = false, widen2 = false;
199 Type *type1 = 0, *type2 = 0;
200
201 if ( env.lookup( var1->get_name(), class1 ) ) {
202 hasClass1 = true;
203 if ( class1.type ) {
204 if ( occurs( class1.type, var2->get_name(), env ) ) {
205 return false;
206 } // if
207 type1 = class1.type->clone();
208 } // if
209 widen1 = widenMode.widenFirst && class1.allowWidening;
210 } // if
211 if ( env.lookup( var2->get_name(), class2 ) ) {
212 hasClass2 = true;
213 if ( class2.type ) {
214 if ( occurs( class2.type, var1->get_name(), env ) ) {
215 return false;
216 } // if
217 type2 = class2.type->clone();
218 } // if
219 widen2 = widenMode.widenSecond && class2.allowWidening;
220 } // if
221
222 if ( type1 && type2 ) {
223// std::cout << "has type1 && type2" << std::endl;
224 WidenMode newWidenMode ( widen1, widen2 );
225 Type *common = 0;
226 if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, newWidenMode, indexer, common ) ) {
227 class1.vars.insert( class2.vars.begin(), class2.vars.end() );
228 class1.allowWidening = widen1 && widen2;
229 if ( common ) {
230 common->get_qualifiers() = Type::Qualifiers();
231 delete class1.type;
232 class1.type = common;
233 } // if
234 env.add( class1 );
235 } else {
236 result = false;
237 } // if
238 } else if ( hasClass1 && hasClass2 ) {
239 if ( type1 ) {
240 class1.vars.insert( class2.vars.begin(), class2.vars.end() );
241 class1.allowWidening = widen1;
242 env.add( class1 );
243 } else {
244 class2.vars.insert( class1.vars.begin(), class1.vars.end() );
245 class2.allowWidening = widen2;
246 env.add( class2 );
247 } // if
248 } else if ( hasClass1 ) {
249 class1.vars.insert( var2->get_name() );
250 class1.allowWidening = widen1;
251 env.add( class1 );
252 } else if ( hasClass2 ) {
253 class2.vars.insert( var1->get_name() );
254 class2.allowWidening = widen2;
255 env.add( class2 );
256 } else {
257 EqvClass newClass;
258 newClass.vars.insert( var1->get_name() );
259 newClass.vars.insert( var2->get_name() );
260 newClass.allowWidening = widen1 && widen2;
261 newClass.kind = kind;
262 env.add( newClass );
263 } // if
264 delete type1;
265 delete type2;
266 return result;
267 }
268
269 bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) {
270 OpenVarSet closedVars;
271 findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false );
272 findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true );
273 Type *commonType = 0;
274 if ( unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) {
275 if ( commonType ) {
276 delete commonType;
277 } // if
278 return true;
279 } else {
280 return false;
281 } // if
282 }
283
284 bool unify( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer, Type *&commonType ) {
285 OpenVarSet closedVars;
286 findOpenVars( type1, openVars, closedVars, needAssertions, haveAssertions, false );
287 findOpenVars( type2, openVars, closedVars, needAssertions, haveAssertions, true );
288 return unifyInexact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType );
289 }
290
291 bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) {
292#ifdef DEBUG
293 TypeEnvironment debugEnv( env );
294#endif
295 if ( type1->get_qualifiers() != type2->get_qualifiers() ) {
296 return false;
297 }
298
299 bool result;
300 TypeInstType *var1 = dynamic_cast< TypeInstType* >( type1 );
301 TypeInstType *var2 = dynamic_cast< TypeInstType* >( type2 );
302 OpenVarSet::const_iterator entry1, entry2;
303 if ( var1 ) {
304 entry1 = openVars.find( var1->get_name() );
305 } // if
306 if ( var2 ) {
307 entry2 = openVars.find( var2->get_name() );
308 } // if
309 bool isopen1 = var1 && ( entry1 != openVars.end() );
310 bool isopen2 = var2 && ( entry2 != openVars.end() );
311
312 if ( isopen1 && isopen2 && entry1->second == entry2->second ) {
313 result = bindVarToVar( var1, var2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer );
314 } else if ( isopen1 ) {
315 result = bindVar( var1, type2, entry1->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer );
316 } else if ( isopen2 ) {
317 result = bindVar( var2, type1, entry2->second, env, needAssertions, haveAssertions, openVars, widenMode, indexer );
318 } else {
319 Unify comparator( type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer );
320 type1->accept( comparator );
321 result = comparator.get_result();
322 } // if
323#ifdef DEBUG
324 std::cout << "============ unifyExact" << std::endl;
325 std::cout << "type1 is ";
326 type1->print( std::cout );
327 std::cout << std::endl << "type2 is ";
328 type2->print( std::cout );
329 std::cout << std::endl << "openVars are ";
330 printOpenVarSet( openVars, std::cout, 8 );
331 std::cout << std::endl << "input env is " << std::endl;
332 debugEnv.print( std::cout, 8 );
333 std::cout << std::endl << "result env is " << std::endl;
334 env.print( std::cout, 8 );
335 std::cout << "result is " << result << std::endl;
336#endif
337 return result;
338 }
339
340 bool unifyExact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, OpenVarSet &openVars, const SymTab::Indexer &indexer ) {
341 return unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer );
342 }
343
344 bool unifyInexact( Type *type1, Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer, Type *&common ) {
345 Type::Qualifiers tq1 = type1->get_qualifiers(), tq2 = type2->get_qualifiers();
346 type1->get_qualifiers() = Type::Qualifiers();
347 type2->get_qualifiers() = Type::Qualifiers();
348 bool result;
349#ifdef DEBUG
350 std::cout << "unifyInexact type 1 is ";
351 type1->print( std::cout );
352 std::cout << "type 2 is ";
353 type2->print( std::cout );
354 std::cout << std::endl;
355#endif
356 if ( ! unifyExact( type1, type2, env, needAssertions, haveAssertions, openVars, widenMode, indexer ) ) {
357#ifdef DEBUG
358 std::cout << "unifyInexact: no exact unification found" << std::endl;
359#endif
360 if ( ( common = commonType( type1, type2, widenMode.widenFirst, widenMode.widenSecond, indexer, env, openVars ) ) ) {
361 common->get_qualifiers() = tq1 + tq2;
362#ifdef DEBUG
363 std::cout << "unifyInexact: common type is ";
364 common->print( std::cout );
365 std::cout << std::endl;
366#endif
367 result = true;
368 } else {
369#ifdef DEBUG
370 std::cout << "unifyInexact: no common type found" << std::endl;
371#endif
372 result = false;
373 } // if
374 } else {
375 if ( tq1 != tq2 ) {
376 if ( ( tq1 > tq2 || widenMode.widenFirst ) && ( tq2 > tq1 || widenMode.widenSecond ) ) {
377 common = type1->clone();
378 common->get_qualifiers() = tq1 + tq2;
379 result = true;
380 } else {
381 result = false;
382 } // if
383 } else {
384 result = true;
385 } // if
386 } // if
387 type1->get_qualifiers() = tq1;
388 type2->get_qualifiers() = tq2;
389 return result;
390 }
391
392 Unify::Unify( Type *type2, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer )
393 : result( false ), type2( type2 ), env( env ), needAssertions( needAssertions ), haveAssertions( haveAssertions ), openVars( openVars ), widenMode( widenMode ), indexer( indexer ) {
394 }
395
396 void Unify::visit(VoidType *voidType) {
397 result = dynamic_cast< VoidType* >( type2 );
398 }
399
400 void Unify::visit(BasicType *basicType) {
401 if ( BasicType *otherBasic = dynamic_cast< BasicType* >( type2 ) ) {
402 result = basicType->get_kind() == otherBasic->get_kind();
403 } // if
404 }
405
406 void markAssertionSet( AssertionSet &assertions, DeclarationWithType *assert ) {
407/// std::cout << "assertion set is" << std::endl;
408/// printAssertionSet( assertions, std::cout, 8 );
409/// std::cout << "looking for ";
410/// assert->print( std::cout );
411/// std::cout << std::endl;
412 AssertionSet::iterator i = assertions.find( assert );
413 if ( i != assertions.end() ) {
414/// std::cout << "found it!" << std::endl;
415 i->second = true;
416 } // if
417 }
418
419 void markAssertions( AssertionSet &assertion1, AssertionSet &assertion2, Type *type ) {
420 for ( std::list< TypeDecl* >::const_iterator tyvar = type->get_forall().begin(); tyvar != type->get_forall().end(); ++tyvar ) {
421 for ( std::list< DeclarationWithType* >::const_iterator assert = (*tyvar)->get_assertions().begin(); assert != (*tyvar)->get_assertions().end(); ++assert ) {
422 markAssertionSet( assertion1, *assert );
423 markAssertionSet( assertion2, *assert );
424 } // for
425 } // for
426 }
427
428 void Unify::visit(PointerType *pointerType) {
429 if ( PointerType *otherPointer = dynamic_cast< PointerType* >( type2 ) ) {
430 result = unifyExact( pointerType->get_base(), otherPointer->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer );
431 markAssertions( haveAssertions, needAssertions, pointerType );
432 markAssertions( haveAssertions, needAssertions, otherPointer );
433 } // if
434 }
435
436 void Unify::visit(ArrayType *arrayType) {
437 ArrayType *otherArray = dynamic_cast< ArrayType* >( type2 );
438 // to unify, array types must both be VLA or both not VLA
439 // and must both have a dimension expression or not have a dimension
440 if ( otherArray && arrayType->get_isVarLen() == otherArray->get_isVarLen() ) {
441
442 // not positive this is correct in all cases, but it's needed for typedefs
443 if ( arrayType->get_isVarLen() || otherArray->get_isVarLen() ) {
444 return;
445 }
446
447 if ( ! arrayType->get_isVarLen() && ! otherArray->get_isVarLen() &&
448 arrayType->get_dimension() != 0 && otherArray->get_dimension() != 0 ) {
449 ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() );
450 ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( otherArray->get_dimension() );
451 // see C11 Reference Manual 6.7.6.2.6
452 // two array types with size specifiers that are integer constant expressions are
453 // compatible if both size specifiers have the same constant value
454 if ( ce1 && ce2 ) {
455 Constant * c1 = ce1->get_constant();
456 Constant * c2 = ce2->get_constant();
457
458 if ( c1->get_value() != c2->get_value() ) {
459 // does not unify if the dimension is different
460 return;
461 }
462 }
463 }
464
465 result = unifyExact( arrayType->get_base(), otherArray->get_base(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer );
466 } // if
467 }
468
469 template< typename Iterator1, typename Iterator2 >
470 bool unifyDeclList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, const SymTab::Indexer &indexer ) {
471 for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) {
472 // Type * commonType;
473 // if ( ! unifyInexact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( true, true ), indexer, commonType ) ) {
474 if ( ! unifyExact( (*list1Begin)->get_type(), (*list2Begin)->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer ) ) {
475 return false;
476 } // if
477 } // for
478 if ( list1Begin != list1End || list2Begin != list2End ) {
479 return false;
480 } else {
481 return true;
482 } // if
483 }
484
485 void Unify::visit(FunctionType *functionType) {
486 FunctionType *otherFunction = dynamic_cast< FunctionType* >( type2 );
487 if ( otherFunction && functionType->get_isVarArgs() == otherFunction->get_isVarArgs() ) {
488 if ( functionType->get_parameters().size() == otherFunction->get_parameters().size() && functionType->get_returnVals().size() == otherFunction->get_returnVals().size() ) {
489 if ( unifyDeclList( functionType->get_parameters().begin(), functionType->get_parameters().end(), otherFunction->get_parameters().begin(), otherFunction->get_parameters().end(), env, needAssertions, haveAssertions, openVars, indexer ) ) {
490 if ( unifyDeclList( functionType->get_returnVals().begin(), functionType->get_returnVals().end(), otherFunction->get_returnVals().begin(), otherFunction->get_returnVals().end(), env, needAssertions, haveAssertions, openVars, indexer ) ) {
491
492 markAssertions( haveAssertions, needAssertions, functionType );
493 markAssertions( haveAssertions, needAssertions, otherFunction );
494
495 result = true;
496 } // if
497 } // if
498 } // if
499 } // if
500 }
501
502 template< typename RefType >
503 void Unify::handleRefType( RefType *inst, Type *other ) {
504 // check that other type is compatible and named the same
505 RefType *otherStruct = dynamic_cast< RefType* >( other );
506 result = otherStruct && inst->get_name() == otherStruct->get_name();
507 }
508
509 template< typename RefType >
510 void Unify::handleGenericRefType( RefType *inst, Type *other ) {
511 // Check that other type is compatible and named the same
512 handleRefType( inst, other );
513 if ( ! result ) return;
514 // Check that parameters of types unify, if any
515 std::list< Expression* > params = inst->get_parameters();
516 std::list< Expression* > otherParams = ((RefType*)other)->get_parameters();
517
518 std::list< Expression* >::const_iterator it = params.begin(), jt = otherParams.begin();
519 for ( ; it != params.end() && jt != otherParams.end(); ++it, ++jt ) {
520 TypeExpr *param = dynamic_cast< TypeExpr* >(*it);
521 assert(param && "Aggregate parameters should be type expressions");
522 TypeExpr *otherParam = dynamic_cast< TypeExpr* >(*jt);
523 assert(otherParam && "Aggregate parameters should be type expressions");
524
525 if ( ! unifyExact( param->get_type(), otherParam->get_type(), env, needAssertions, haveAssertions, openVars, WidenMode(false, false), indexer ) ) {
526 result = false;
527 return;
528 }
529 }
530 result = ( it == params.end() && jt == otherParams.end() );
531 }
532
533 void Unify::visit(StructInstType *structInst) {
534 handleGenericRefType( structInst, type2 );
535 }
536
537 void Unify::visit(UnionInstType *unionInst) {
538 handleGenericRefType( unionInst, type2 );
539 }
540
541 void Unify::visit(EnumInstType *enumInst) {
542 handleRefType( enumInst, type2 );
543 }
544
545 void Unify::visit(TraitInstType *contextInst) {
546 handleRefType( contextInst, type2 );
547 }
548
549 void Unify::visit(TypeInstType *typeInst) {
550 assert( openVars.find( typeInst->get_name() ) == openVars.end() );
551 TypeInstType *otherInst = dynamic_cast< TypeInstType* >( type2 );
552 if ( otherInst && typeInst->get_name() == otherInst->get_name() ) {
553 result = true;
554/// } else {
555/// NamedTypeDecl *nt = indexer.lookupType( typeInst->get_name() );
556/// if ( nt ) {
557/// TypeDecl *type = dynamic_cast< TypeDecl* >( nt );
558/// assert( type );
559/// if ( type->get_base() ) {
560/// result = unifyExact( type->get_base(), typeInst, env, needAssertions, haveAssertions, openVars, WidenMode( false, false ), indexer );
561/// }
562/// }
563 } // if
564 }
565
566 template< typename Iterator1, typename Iterator2 >
567 bool unifyList( Iterator1 list1Begin, Iterator1 list1End, Iterator2 list2Begin, Iterator2 list2End, TypeEnvironment &env, AssertionSet &needAssertions, AssertionSet &haveAssertions, const OpenVarSet &openVars, WidenMode widenMode, const SymTab::Indexer &indexer ) {
568 for ( ; list1Begin != list1End && list2Begin != list2End; ++list1Begin, ++list2Begin ) {
569 Type *commonType = 0;
570 if ( ! unifyInexact( *list1Begin, *list2Begin, env, needAssertions, haveAssertions, openVars, widenMode, indexer, commonType ) ) {
571 return false;
572 }
573 delete commonType;
574 } // for
575 if ( list1Begin != list1End || list2Begin != list2End ) {
576 return false;
577 } else {
578 return true;
579 } //if
580 }
581
582 void Unify::visit(TupleType *tupleType) {
583 if ( TupleType *otherTuple = dynamic_cast< TupleType* >( type2 ) ) {
584 result = unifyList( tupleType->get_types().begin(), tupleType->get_types().end(), otherTuple->get_types().begin(), otherTuple->get_types().end(), env, needAssertions, haveAssertions, openVars, widenMode, indexer );
585 } // if
586 }
587
588 void Unify::visit(VarArgsType *varArgsType) {
589 result = dynamic_cast< VarArgsType* >( type2 );
590 }
591
592 void Unify::visit(ZeroType *zeroType) {
593 result = dynamic_cast< ZeroType* >( type2 );
594 }
595
596 void Unify::visit(OneType *oneType) {
597 result = dynamic_cast< OneType* >( type2 );
598 }
599
600 // xxx - compute once and store in the FunctionType?
601 Type * extractResultType( FunctionType * function ) {
602 if ( function->get_returnVals().size() == 0 ) {
603 return new VoidType( Type::Qualifiers() );
604 } else if ( function->get_returnVals().size() == 1 ) {
605 return function->get_returnVals().front()->get_type()->clone();
606 } else {
607 TupleType * tupleType = new TupleType( Type::Qualifiers() );
608 for ( DeclarationWithType * decl : function->get_returnVals() ) {
609 tupleType->get_types().push_back( decl->get_type()->clone() );
610 } // for
611 return tupleType;
612 }
613 }
614} // namespace ResolvExpr
615
616// Local Variables: //
617// tab-width: 4 //
618// mode: c++ //
619// compile-command: "make install" //
620// End: //
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