source: src/ResolvExpr/Resolver.cc@ 387c9a1

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 with_gc
Last change on this file since 387c9a1 was 6f326b1, checked in by Rob Schluntz <rschlunt@…>, 7 years ago

Add type variables from function alternative to the type environment for WaitforStmt
  • Property mode set to 100644
File size: 31.8 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// Resolver.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Sun May 17 12:17:01 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Sat Feb 17 11:19:40 2018
13// Update Count : 213
14//
15
16#include <stddef.h> // for NULL
17#include <cassert> // for strict_dynamic_cast, assert
18#include <memory> // for allocator, allocator_traits<...
19#include <tuple> // for get
20#include <vector>
21
22#include "Alternative.h" // for Alternative, AltList
23#include "AlternativeFinder.h" // for AlternativeFinder, resolveIn...
24#include "Common/PassVisitor.h" // for PassVisitor
25#include "Common/SemanticError.h" // for SemanticError
26#include "Common/utility.h" // for ValueGuard, group_iterate
27#include "CurrentObject.h" // for CurrentObject
28#include "InitTweak/GenInit.h"
29#include "InitTweak/InitTweak.h" // for isIntrinsicSingleArgCallStmt
30#include "RenameVars.h" // for RenameVars, global_renamer
31#include "ResolvExpr/TypeEnvironment.h" // for TypeEnvironment
32#include "ResolveTypeof.h" // for resolveTypeof
33#include "Resolver.h"
34#include "SymTab/Autogen.h" // for SizeType
35#include "SymTab/Indexer.h" // for Indexer
36#include "SynTree/Declaration.h" // for ObjectDecl, TypeDecl, Declar...
37#include "SynTree/Expression.h" // for Expression, CastExpr, InitExpr
38#include "SynTree/Initializer.h" // for ConstructorInit, SingleInit
39#include "SynTree/Statement.h" // for ForStmt, Statement, BranchStmt
40#include "SynTree/Type.h" // for Type, BasicType, PointerType
41#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
42#include "SynTree/Visitor.h" // for acceptAll, maybeAccept
43#include "Tuples/Tuples.h"
44#include "typeops.h" // for extractResultType
45#include "Unify.h" // for unify
46
47using namespace std;
48
49namespace ResolvExpr {
50 struct Resolver final : public WithIndexer, public WithGuards, public WithVisitorRef<Resolver>, public WithShortCircuiting, public WithStmtsToAdd {
51 Resolver() {}
52 Resolver( const SymTab::Indexer & other ) {
53 indexer = other;
54 }
55
56 void previsit( FunctionDecl *functionDecl );
57 void postvisit( FunctionDecl *functionDecl );
58 void previsit( ObjectDecl *objectDecll );
59 void previsit( TypeDecl *typeDecl );
60 void previsit( EnumDecl * enumDecl );
61 void previsit( StaticAssertDecl * assertDecl );
62
63 void previsit( ArrayType * at );
64 void previsit( PointerType * at );
65
66 void previsit( ExprStmt *exprStmt );
67 void previsit( AsmExpr *asmExpr );
68 void previsit( AsmStmt *asmStmt );
69 void previsit( IfStmt *ifStmt );
70 void previsit( WhileStmt *whileStmt );
71 void previsit( ForStmt *forStmt );
72 void previsit( SwitchStmt *switchStmt );
73 void previsit( CaseStmt *caseStmt );
74 void previsit( BranchStmt *branchStmt );
75 void previsit( ReturnStmt *returnStmt );
76 void previsit( ThrowStmt *throwStmt );
77 void previsit( CatchStmt *catchStmt );
78 void previsit( WaitForStmt * stmt );
79 void previsit( WithStmt * withStmt );
80
81 void previsit( SingleInit *singleInit );
82 void previsit( ListInit *listInit );
83 void previsit( ConstructorInit *ctorInit );
84 private:
85 typedef std::list< Initializer * >::iterator InitIterator;
86
87 template< typename PtrType >
88 void handlePtrType( PtrType * type );
89
90 void resolveWithExprs( std::list< Expression * > & withExprs, std::list< Statement * > & newStmts );
91 void fallbackInit( ConstructorInit * ctorInit );
92
93 Type * functionReturn = nullptr;
94 CurrentObject currentObject = nullptr;
95 bool inEnumDecl = false;
96 };
97
98 void resolve( std::list< Declaration * > translationUnit ) {
99 PassVisitor<Resolver> resolver;
100 acceptAll( translationUnit, resolver );
101 }
102
103 void resolveDecl( Declaration * decl, const SymTab::Indexer &indexer ) {
104 PassVisitor<Resolver> resolver( indexer );
105 maybeAccept( decl, resolver );
106 }
107
108 namespace {
109 struct DeleteFinder : public WithShortCircuiting {
110 DeletedExpr * delExpr = nullptr;
111 void previsit( DeletedExpr * expr ) {
112 if ( delExpr ) visit_children = false;
113 else delExpr = expr;
114 }
115
116 void previsit( Expression * ) {
117 if ( delExpr ) visit_children = false;
118 }
119 };
120 }
121
122 DeletedExpr * findDeletedExpr( Expression * expr ) {
123 PassVisitor<DeleteFinder> finder;
124 expr->accept( finder );
125 return finder.pass.delExpr;
126 }
127
128 namespace {
129 void finishExpr( Expression *expr, const TypeEnvironment &env, TypeSubstitution * oldenv = nullptr ) {
130 expr->env = oldenv ? oldenv->clone() : new TypeSubstitution;
131 env.makeSubstitution( *expr->get_env() );
132 }
133
134 void removeExtraneousCast( Expression *& expr, const SymTab::Indexer & indexer ) {
135 if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
136 if ( ResolvExpr::typesCompatible( castExpr->arg->result, castExpr->result, indexer ) ) {
137 // cast is to the same type as its argument, so it's unnecessary -- remove it
138 expr = castExpr->arg;
139 castExpr->arg = nullptr;
140 std::swap( expr->env, castExpr->env );
141 delete castExpr;
142 }
143 }
144 }
145 } // namespace
146
147 namespace {
148 void findUnfinishedKindExpression(Expression * untyped, Alternative & alt, const SymTab::Indexer & indexer, const std::string & kindStr, std::function<bool(const Alternative &)> pred, bool adjust = false, bool prune = true, bool failFast = true) {
149 assertf( untyped, "expected a non-null expression." );
150 TypeEnvironment env;
151 AlternativeFinder finder( indexer, env );
152 finder.find( untyped, adjust, prune, failFast );
153
154 #if 0
155 if ( finder.get_alternatives().size() != 1 ) {
156 std::cerr << "untyped expr is ";
157 untyped->print( std::cerr );
158 std::cerr << std::endl << "alternatives are:";
159 for ( const Alternative & alt : finder.get_alternatives() ) {
160 alt.print( std::cerr );
161 } // for
162 } // if
163 #endif
164
165 AltList candidates;
166 for ( Alternative & alt : finder.get_alternatives() ) {
167 if ( pred( alt ) ) {
168 candidates.push_back( std::move( alt ) );
169 }
170 }
171
172 // xxx - if > 1 alternative with same cost, ignore deleted and pick from remaining
173 // choose the lowest cost expression among the candidates
174 AltList winners;
175 findMinCost( candidates.begin(), candidates.end(), back_inserter( winners ) );
176 if ( winners.size() == 0 ) {
177 SemanticError( untyped, toString( "No reasonable alternatives for ", kindStr, (kindStr != "" ? " " : ""), "expression: ") );
178 } else if ( winners.size() != 1 ) {
179 std::ostringstream stream;
180 stream << "Cannot choose between " << winners.size() << " alternatives for " << kindStr << (kindStr != "" ? " " : "") << "expression\n";
181 untyped->print( stream );
182 stream << " Alternatives are:\n";
183 printAlts( winners, stream, 1 );
184 SemanticError( untyped->location, stream.str() );
185 }
186
187 // there is one unambiguous interpretation - move the expression into the with statement
188 Alternative & choice = winners.front();
189 if ( findDeletedExpr( choice.expr ) ) {
190 SemanticError( choice.expr, "Unique best alternative includes deleted identifier in " );
191 }
192 alt = std::move( choice );
193 }
194
195 /// resolve `untyped` to the expression whose alternative satisfies `pred` with the lowest cost; kindStr is used for providing better error messages
196 void findKindExpression(Expression *& untyped, const SymTab::Indexer & indexer, const std::string & kindStr, std::function<bool(const Alternative &)> pred, bool adjust = false, bool prune = true, bool failFast = true) {
197 if ( ! untyped ) return;
198 Alternative choice;
199 findUnfinishedKindExpression( untyped, choice, indexer, kindStr, pred, adjust, prune, failFast );
200 finishExpr( choice.expr, choice.env, untyped->env );
201 delete untyped;
202 untyped = choice.expr;
203 choice.expr = nullptr;
204 }
205
206 bool standardAlternativeFilter( const Alternative & ) {
207 // currently don't need to filter, under normal circumstances.
208 // in the future, this may be useful for removing deleted expressions
209 return true;
210 }
211 } // namespace
212
213 // used in resolveTypeof
214 Expression * resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer ) {
215 TypeEnvironment env;
216 return resolveInVoidContext( expr, indexer, env );
217 }
218
219 Expression * resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer, TypeEnvironment &env ) {
220 // it's a property of the language that a cast expression has either 1 or 0 interpretations; if it has 0
221 // interpretations, an exception has already been thrown.
222 assertf( expr, "expected a non-null expression." );
223
224 static CastExpr untyped( nullptr ); // cast to void
225
226 // set up and resolve expression cast to void
227 untyped.arg = expr;
228 Alternative choice;
229 findUnfinishedKindExpression( &untyped, choice, indexer, "", standardAlternativeFilter, true );
230 CastExpr * castExpr = strict_dynamic_cast< CastExpr * >( choice.expr );
231 env = std::move( choice.env );
232
233 // clean up resolved expression
234 Expression * ret = castExpr->arg;
235 castExpr->arg = nullptr;
236
237 // unlink the arg so that it isn't deleted twice at the end of the program
238 untyped.arg = nullptr;
239 return ret;
240 }
241
242 void findVoidExpression( Expression *& untyped, const SymTab::Indexer &indexer ) {
243 resetTyVarRenaming();
244 TypeEnvironment env;
245 Expression * newExpr = resolveInVoidContext( untyped, indexer, env );
246 finishExpr( newExpr, env, untyped->env );
247 delete untyped;
248 untyped = newExpr;
249 }
250
251 void findSingleExpression( Expression *&untyped, const SymTab::Indexer &indexer ) {
252 findKindExpression( untyped, indexer, "", standardAlternativeFilter );
253 }
254
255 void findSingleExpression( Expression *& untyped, Type * type, const SymTab::Indexer & indexer ) {
256 assert( untyped && type );
257 untyped = new CastExpr( untyped, type );
258 findSingleExpression( untyped, indexer );
259 removeExtraneousCast( untyped, indexer );
260 }
261
262 namespace {
263 bool isIntegralType( const Alternative & alt ) {
264 Type * type = alt.expr->result;
265 if ( dynamic_cast< EnumInstType * >( type ) ) {
266 return true;
267 } else if ( BasicType *bt = dynamic_cast< BasicType * >( type ) ) {
268 return bt->isInteger();
269 } else if ( dynamic_cast< ZeroType* >( type ) != nullptr || dynamic_cast< OneType* >( type ) != nullptr ) {
270 return true;
271 } else {
272 return false;
273 } // if
274 }
275
276 void findIntegralExpression( Expression *& untyped, const SymTab::Indexer &indexer ) {
277 findKindExpression( untyped, indexer, "condition", isIntegralType );
278 }
279 }
280
281 void Resolver::previsit( ObjectDecl *objectDecl ) {
282 Type *new_type = resolveTypeof( objectDecl->get_type(), indexer );
283 objectDecl->set_type( new_type );
284 // To handle initialization of routine pointers, e.g., int (*fp)(int) = foo(), means that class-variable
285 // initContext is changed multiple time because the LHS is analysed twice. The second analysis changes
286 // initContext because of a function type can contain object declarations in the return and parameter types. So
287 // each value of initContext is retained, so the type on the first analysis is preserved and used for selecting
288 // the RHS.
289 GuardValue( currentObject );
290 currentObject = CurrentObject( objectDecl->get_type() );
291 if ( inEnumDecl && dynamic_cast< EnumInstType * >( objectDecl->get_type() ) ) {
292 // enumerator initializers should not use the enum type to initialize, since
293 // the enum type is still incomplete at this point. Use signed int instead.
294 currentObject = CurrentObject( new BasicType( Type::Qualifiers(), BasicType::SignedInt ) );
295 }
296 }
297
298 template< typename PtrType >
299 void Resolver::handlePtrType( PtrType * type ) {
300 if ( type->get_dimension() ) {
301 findSingleExpression( type->dimension, SymTab::SizeType->clone(), indexer );
302 }
303 }
304
305 void Resolver::previsit( ArrayType * at ) {
306 handlePtrType( at );
307 }
308
309 void Resolver::previsit( PointerType * pt ) {
310 handlePtrType( pt );
311 }
312
313 void Resolver::previsit( TypeDecl *typeDecl ) {
314 if ( typeDecl->get_base() ) {
315 Type *new_type = resolveTypeof( typeDecl->get_base(), indexer );
316 typeDecl->set_base( new_type );
317 } // if
318 }
319
320 void Resolver::previsit( FunctionDecl *functionDecl ) {
321#if 0
322 std::cerr << "resolver visiting functiondecl ";
323 functionDecl->print( std::cerr );
324 std::cerr << std::endl;
325#endif
326 Type *new_type = resolveTypeof( functionDecl->type, indexer );
327 functionDecl->set_type( new_type );
328 GuardValue( functionReturn );
329 functionReturn = ResolvExpr::extractResultType( functionDecl->type );
330
331 {
332 // resolve with-exprs with parameters in scope and add any newly generated declarations to the
333 // front of the function body.
334 auto guard = makeFuncGuard( [this]() { indexer.enterScope(); }, [this](){ indexer.leaveScope(); } );
335 indexer.addFunctionType( functionDecl->type );
336 std::list< Statement * > newStmts;
337 resolveWithExprs( functionDecl->withExprs, newStmts );
338 if ( functionDecl->statements ) {
339 functionDecl->statements->kids.splice( functionDecl->statements->kids.begin(), newStmts );
340 } else {
341 assertf( functionDecl->withExprs.empty() && newStmts.empty(), "Function %s without a body has with-clause and/or generated with declarations.", functionDecl->name.c_str() );
342 }
343 }
344 }
345
346 void Resolver::postvisit( FunctionDecl *functionDecl ) {
347 // default value expressions have an environment which shouldn't be there and trips up later passes.
348 // xxx - it might be necessary to somehow keep the information from this environment, but I can't currently
349 // see how it's useful.
350 for ( Declaration * d : functionDecl->type->parameters ) {
351 if ( ObjectDecl * obj = dynamic_cast< ObjectDecl * >( d ) ) {
352 if ( SingleInit * init = dynamic_cast< SingleInit * >( obj->init ) ) {
353 delete init->value->env;
354 init->value->env = nullptr;
355 }
356 }
357 }
358 }
359
360 void Resolver::previsit( EnumDecl * ) {
361 // in case we decide to allow nested enums
362 GuardValue( inEnumDecl );
363 inEnumDecl = true;
364 }
365
366 void Resolver::previsit( StaticAssertDecl * assertDecl ) {
367 findIntegralExpression( assertDecl->condition, indexer );
368 }
369
370 void Resolver::previsit( ExprStmt *exprStmt ) {
371 visit_children = false;
372 assertf( exprStmt->expr, "ExprStmt has null Expression in resolver" );
373 findVoidExpression( exprStmt->expr, indexer );
374 }
375
376 void Resolver::previsit( AsmExpr *asmExpr ) {
377 visit_children = false;
378 findVoidExpression( asmExpr->operand, indexer );
379 if ( asmExpr->get_inout() ) {
380 findVoidExpression( asmExpr->inout, indexer );
381 } // if
382 }
383
384 void Resolver::previsit( AsmStmt *asmStmt ) {
385 visit_children = false;
386 acceptAll( asmStmt->get_input(), *visitor );
387 acceptAll( asmStmt->get_output(), *visitor );
388 }
389
390 void Resolver::previsit( IfStmt *ifStmt ) {
391 findIntegralExpression( ifStmt->condition, indexer );
392 }
393
394 void Resolver::previsit( WhileStmt *whileStmt ) {
395 findIntegralExpression( whileStmt->condition, indexer );
396 }
397
398 void Resolver::previsit( ForStmt *forStmt ) {
399 if ( forStmt->condition ) {
400 findIntegralExpression( forStmt->condition, indexer );
401 } // if
402
403 if ( forStmt->increment ) {
404 findVoidExpression( forStmt->increment, indexer );
405 } // if
406 }
407
408 void Resolver::previsit( SwitchStmt *switchStmt ) {
409 GuardValue( currentObject );
410 findIntegralExpression( switchStmt->condition, indexer );
411
412 currentObject = CurrentObject( switchStmt->condition->result );
413 }
414
415 void Resolver::previsit( CaseStmt *caseStmt ) {
416 if ( caseStmt->get_condition() ) {
417 std::list< InitAlternative > initAlts = currentObject.getOptions();
418 assertf( initAlts.size() == 1, "SwitchStmt did not correctly resolve an integral expression." );
419 // must remove cast from case statement because RangeExpr cannot be cast.
420 Expression * newExpr = new CastExpr( caseStmt->condition, initAlts.front().type->clone() );
421 findSingleExpression( newExpr, indexer );
422 CastExpr * castExpr = strict_dynamic_cast< CastExpr * >( newExpr );
423 caseStmt->condition = castExpr->arg;
424 castExpr->arg = nullptr;
425 delete castExpr;
426 }
427 }
428
429 void Resolver::previsit( BranchStmt *branchStmt ) {
430 visit_children = false;
431 // must resolve the argument for a computed goto
432 if ( branchStmt->get_type() == BranchStmt::Goto ) { // check for computed goto statement
433 if ( branchStmt->computedTarget ) {
434 // computed goto argument is void *
435 findSingleExpression( branchStmt->computedTarget, new PointerType( Type::Qualifiers(), new VoidType( Type::Qualifiers() ) ), indexer );
436 } // if
437 } // if
438 }
439
440 void Resolver::previsit( ReturnStmt *returnStmt ) {
441 visit_children = false;
442 if ( returnStmt->expr ) {
443 findSingleExpression( returnStmt->expr, functionReturn->clone(), indexer );
444 } // if
445 }
446
447 void Resolver::previsit( ThrowStmt *throwStmt ) {
448 visit_children = false;
449 // TODO: Replace *exception type with &exception type.
450 if ( throwStmt->get_expr() ) {
451 StructDecl * exception_decl =
452 indexer.lookupStruct( "__cfaabi_ehm__base_exception_t" );
453 assert( exception_decl );
454 Type * exceptType = new PointerType( noQualifiers, new StructInstType( noQualifiers, exception_decl ) );
455 findSingleExpression( throwStmt->expr, exceptType, indexer );
456 }
457 }
458
459 void Resolver::previsit( CatchStmt *catchStmt ) {
460 if ( catchStmt->cond ) {
461 findSingleExpression( catchStmt->cond, new BasicType( noQualifiers, BasicType::Bool ), indexer );
462 }
463 }
464
465 template< typename iterator_t >
466 inline bool advance_to_mutex( iterator_t & it, const iterator_t & end ) {
467 while( it != end && !(*it)->get_type()->get_mutex() ) {
468 it++;
469 }
470
471 return it != end;
472 }
473
474 void Resolver::previsit( WaitForStmt * stmt ) {
475 visit_children = false;
476
477 // Resolve all clauses first
478 for( auto& clause : stmt->clauses ) {
479
480 TypeEnvironment env;
481 AlternativeFinder funcFinder( indexer, env );
482
483 // Find all alternatives for a function in canonical form
484 funcFinder.findWithAdjustment( clause.target.function );
485
486 if ( funcFinder.get_alternatives().empty() ) {
487 stringstream ss;
488 ss << "Use of undeclared indentifier '";
489 ss << strict_dynamic_cast<NameExpr*>( clause.target.function )->name;
490 ss << "' in call to waitfor";
491 SemanticError( stmt->location, ss.str() );
492 }
493
494 if(clause.target.arguments.empty()) {
495 SemanticError( stmt->location, "Waitfor clause must have at least one mutex parameter");
496 }
497
498 // Find all alternatives for all arguments in canonical form
499 std::vector< AlternativeFinder > argAlternatives;
500 funcFinder.findSubExprs( clause.target.arguments.begin(), clause.target.arguments.end(), back_inserter( argAlternatives ) );
501
502 // List all combinations of arguments
503 std::vector< AltList > possibilities;
504 combos( argAlternatives.begin(), argAlternatives.end(), back_inserter( possibilities ) );
505
506 AltList func_candidates;
507 std::vector< AltList > args_candidates;
508
509 // For every possible function :
510 // try matching the arguments to the parameters
511 // not the other way around because we have more arguments than parameters
512 SemanticErrorException errors;
513 for ( Alternative & func : funcFinder.get_alternatives() ) {
514 try {
515 PointerType * pointer = dynamic_cast< PointerType* >( func.expr->get_result()->stripReferences() );
516 if( !pointer ) {
517 SemanticError( func.expr->get_result(), "candidate not viable: not a pointer type\n" );
518 }
519
520 FunctionType * function = dynamic_cast< FunctionType* >( pointer->get_base() );
521 if( !function ) {
522 SemanticError( pointer->get_base(), "candidate not viable: not a function type\n" );
523 }
524
525
526 {
527 auto param = function->parameters.begin();
528 auto param_end = function->parameters.end();
529
530 if( !advance_to_mutex( param, param_end ) ) {
531 SemanticError(function, "candidate function not viable: no mutex parameters\n");
532 }
533 }
534
535 Alternative newFunc( func );
536 // Strip reference from function
537 referenceToRvalueConversion( newFunc.expr, newFunc.cost );
538
539 // For all the set of arguments we have try to match it with the parameter of the current function alternative
540 for ( auto & argsList : possibilities ) {
541
542 try {
543 // Declare data structures need for resolution
544 OpenVarSet openVars;
545 AssertionSet resultNeed, resultHave;
546 TypeEnvironment resultEnv( func.env );
547 makeUnifiableVars( function, openVars, resultNeed );
548 // add all type variables as open variables now so that those not used in the parameter
549 // list are still considered open.
550 resultEnv.add( function->forall );
551
552 // Load type variables from arguemnts into one shared space
553 simpleCombineEnvironments( argsList.begin(), argsList.end(), resultEnv );
554
555 // Make sure we don't widen any existing bindings
556 for ( auto & i : resultEnv ) {
557 i.allowWidening = false;
558 }
559
560 // Find any unbound type variables
561 resultEnv.extractOpenVars( openVars );
562
563 auto param = function->parameters.begin();
564 auto param_end = function->parameters.end();
565
566 int n_mutex_arg = 0;
567
568 // For every arguments of its set, check if it matches one of the parameter
569 // The order is important
570 for( auto & arg : argsList ) {
571
572 // Ignore non-mutex arguments
573 if( !advance_to_mutex( param, param_end ) ) {
574 // We ran out of parameters but still have arguments
575 // this function doesn't match
576 SemanticError( function, toString("candidate function not viable: too many mutex arguments, expected ", n_mutex_arg, "\n" ));
577 }
578
579 n_mutex_arg++;
580
581 // Check if the argument matches the parameter type in the current scope
582 if( ! unify( arg.expr->get_result(), (*param)->get_type(), resultEnv, resultNeed, resultHave, openVars, this->indexer ) ) {
583 // Type doesn't match
584 stringstream ss;
585 ss << "candidate function not viable: no known convertion from '";
586 (*param)->get_type()->print( ss );
587 ss << "' to '";
588 arg.expr->get_result()->print( ss );
589 ss << "' with env '";
590 resultEnv.print(ss);
591 ss << "'\n";
592 SemanticError( function, ss.str() );
593 }
594
595 param++;
596 }
597
598 // All arguments match !
599
600 // Check if parameters are missing
601 if( advance_to_mutex( param, param_end ) ) {
602 // We ran out of arguments but still have parameters left
603 // this function doesn't match
604 SemanticError( function, toString("candidate function not viable: too few mutex arguments, expected ", n_mutex_arg, "\n" ));
605 }
606
607 // All parameters match !
608
609 // Finish the expressions to tie in the proper environments
610 finishExpr( newFunc.expr, resultEnv );
611 for( Alternative & alt : argsList ) {
612 finishExpr( alt.expr, resultEnv );
613 }
614
615 // This is a match store it and save it for later
616 func_candidates.push_back( newFunc );
617 args_candidates.push_back( argsList );
618
619 }
620 catch( SemanticErrorException &e ) {
621 errors.append( e );
622 }
623 }
624 }
625 catch( SemanticErrorException &e ) {
626 errors.append( e );
627 }
628 }
629
630 // Make sure we got the right number of arguments
631 if( func_candidates.empty() ) { SemanticErrorException top( stmt->location, "No alternatives for function in call to waitfor" ); top.append( errors ); throw top; }
632 if( args_candidates.empty() ) { SemanticErrorException top( stmt->location, "No alternatives for arguments in call to waitfor" ); top.append( errors ); throw top; }
633 if( func_candidates.size() > 1 ) { SemanticErrorException top( stmt->location, "Ambiguous function in call to waitfor" ); top.append( errors ); throw top; }
634 if( args_candidates.size() > 1 ) { SemanticErrorException top( stmt->location, "Ambiguous arguments in call to waitfor" ); top.append( errors ); throw top; }
635 // TODO: need to use findDeletedExpr to ensure no deleted identifiers are used.
636
637 // Swap the results from the alternative with the unresolved values.
638 // Alternatives will handle deletion on destruction
639 std::swap( clause.target.function, func_candidates.front().expr );
640 for( auto arg_pair : group_iterate( clause.target.arguments, args_candidates.front() ) ) {
641 std::swap ( std::get<0>( arg_pair), std::get<1>( arg_pair).expr );
642 }
643
644 // Resolve the conditions as if it were an IfStmt
645 // Resolve the statments normally
646 findSingleExpression( clause.condition, this->indexer );
647 clause.statement->accept( *visitor );
648 }
649
650
651 if( stmt->timeout.statement ) {
652 // Resolve the timeout as an size_t for now
653 // Resolve the conditions as if it were an IfStmt
654 // Resolve the statments normally
655 findSingleExpression( stmt->timeout.time, new BasicType( noQualifiers, BasicType::LongLongUnsignedInt ), this->indexer );
656 findSingleExpression( stmt->timeout.condition, this->indexer );
657 stmt->timeout.statement->accept( *visitor );
658 }
659
660 if( stmt->orelse.statement ) {
661 // Resolve the conditions as if it were an IfStmt
662 // Resolve the statments normally
663 findSingleExpression( stmt->orelse.condition, this->indexer );
664 stmt->orelse.statement->accept( *visitor );
665 }
666 }
667
668 bool isStructOrUnion( const Alternative & alt ) {
669 Type * t = alt.expr->result->stripReferences();
670 return dynamic_cast< StructInstType * >( t ) || dynamic_cast< UnionInstType * >( t );
671 }
672
673 void Resolver::resolveWithExprs( std::list< Expression * > & withExprs, std::list< Statement * > & newStmts ) {
674 for ( Expression *& expr : withExprs ) {
675 // only struct- and union-typed expressions are viable candidates
676 findKindExpression( expr, indexer, "with statement", isStructOrUnion );
677
678 // if with expression might be impure, create a temporary so that it is evaluated once
679 if ( Tuples::maybeImpure( expr ) ) {
680 static UniqueName tmpNamer( "_with_tmp_" );
681 ObjectDecl * tmp = ObjectDecl::newObject( tmpNamer.newName(), expr->result->clone(), new SingleInit( expr ) );
682 expr = new VariableExpr( tmp );
683 newStmts.push_back( new DeclStmt( tmp ) );
684 if ( InitTweak::isConstructable( tmp->type ) ) {
685 // generate ctor/dtor and resolve them
686 tmp->init = InitTweak::genCtorInit( tmp );
687 tmp->accept( *visitor );
688 }
689 }
690 }
691 }
692
693 void Resolver::previsit( WithStmt * withStmt ) {
694 resolveWithExprs( withStmt->exprs, stmtsToAddBefore );
695 }
696
697 template< typename T >
698 bool isCharType( T t ) {
699 if ( BasicType * bt = dynamic_cast< BasicType * >( t ) ) {
700 return bt->get_kind() == BasicType::Char || bt->get_kind() == BasicType::SignedChar ||
701 bt->get_kind() == BasicType::UnsignedChar;
702 }
703 return false;
704 }
705
706 void Resolver::previsit( SingleInit *singleInit ) {
707 visit_children = false;
708 // resolve initialization using the possibilities as determined by the currentObject cursor
709 Expression * newExpr = new UntypedInitExpr( singleInit->value, currentObject.getOptions() );
710 findSingleExpression( newExpr, indexer );
711 InitExpr * initExpr = strict_dynamic_cast< InitExpr * >( newExpr );
712
713 // move cursor to the object that is actually initialized
714 currentObject.setNext( initExpr->get_designation() );
715
716 // discard InitExpr wrapper and retain relevant pieces
717 newExpr = initExpr->expr;
718 initExpr->expr = nullptr;
719 std::swap( initExpr->env, newExpr->env );
720 std::swap( initExpr->inferParams, newExpr->inferParams ) ;
721 delete initExpr;
722
723 // get the actual object's type (may not exactly match what comes back from the resolver due to conversions)
724 Type * initContext = currentObject.getCurrentType();
725
726 removeExtraneousCast( newExpr, indexer );
727
728 // check if actual object's type is char[]
729 if ( ArrayType * at = dynamic_cast< ArrayType * >( initContext ) ) {
730 if ( isCharType( at->get_base() ) ) {
731 // check if the resolved type is char *
732 if ( PointerType * pt = dynamic_cast< PointerType *>( newExpr->get_result() ) ) {
733 if ( isCharType( pt->get_base() ) ) {
734 if ( CastExpr *ce = dynamic_cast< CastExpr * >( newExpr ) ) {
735 // strip cast if we're initializing a char[] with a char *, e.g. char x[] = "hello";
736 newExpr = ce->get_arg();
737 ce->set_arg( nullptr );
738 std::swap( ce->env, newExpr->env );
739 delete ce;
740 }
741 }
742 }
743 }
744 }
745
746 // set initializer expr to resolved express
747 singleInit->value = newExpr;
748
749 // move cursor to next object in preparation for next initializer
750 currentObject.increment();
751 }
752
753 void Resolver::previsit( ListInit * listInit ) {
754 visit_children = false;
755 // move cursor into brace-enclosed initializer-list
756 currentObject.enterListInit();
757 // xxx - fix this so that the list isn't copied, iterator should be used to change current element
758 std::list<Designation *> newDesignations;
759 for ( auto p : group_iterate(listInit->get_designations(), listInit->get_initializers()) ) {
760 // iterate designations and initializers in pairs, moving the cursor to the current designated object and resolving
761 // the initializer against that object.
762 Designation * des = std::get<0>(p);
763 Initializer * init = std::get<1>(p);
764 newDesignations.push_back( currentObject.findNext( des ) );
765 init->accept( *visitor );
766 }
767 // set the set of 'resolved' designations and leave the brace-enclosed initializer-list
768 listInit->get_designations() = newDesignations; // xxx - memory management
769 currentObject.exitListInit();
770
771 // xxx - this part has not be folded into CurrentObject yet
772 // } else if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( initContext ) ) {
773 // Type * base = tt->get_baseType()->get_base();
774 // if ( base ) {
775 // // know the implementation type, so try using that as the initContext
776 // ObjectDecl tmpObj( "", Type::StorageClasses(), LinkageSpec::Cforall, nullptr, base->clone(), nullptr );
777 // currentObject = &tmpObj;
778 // visit( listInit );
779 // } else {
780 // // missing implementation type -- might be an unknown type variable, so try proceeding with the current init context
781 // Parent::visit( listInit );
782 // }
783 // } else {
784 }
785
786 // ConstructorInit - fall back on C-style initializer
787 void Resolver::fallbackInit( ConstructorInit * ctorInit ) {
788 // could not find valid constructor, or found an intrinsic constructor
789 // fall back on C-style initializer
790 delete ctorInit->get_ctor();
791 ctorInit->set_ctor( NULL );
792 delete ctorInit->get_dtor();
793 ctorInit->set_dtor( NULL );
794 maybeAccept( ctorInit->get_init(), *visitor );
795 }
796
797 // needs to be callable from outside the resolver, so this is a standalone function
798 void resolveCtorInit( ConstructorInit * ctorInit, const SymTab::Indexer & indexer ) {
799 assert( ctorInit );
800 PassVisitor<Resolver> resolver( indexer );
801 ctorInit->accept( resolver );
802 }
803
804 void resolveStmtExpr( StmtExpr * stmtExpr, const SymTab::Indexer & indexer ) {
805 assert( stmtExpr );
806 PassVisitor<Resolver> resolver( indexer );
807 stmtExpr->accept( resolver );
808 stmtExpr->computeResult();
809 // xxx - aggregate the environments from all statements? Possibly in AlternativeFinder instead?
810 }
811
812 void Resolver::previsit( ConstructorInit *ctorInit ) {
813 visit_children = false;
814 // xxx - fallback init has been removed => remove fallbackInit function and remove complexity from FixInit and remove C-init from ConstructorInit
815 maybeAccept( ctorInit->ctor, *visitor );
816 maybeAccept( ctorInit->dtor, *visitor );
817
818 // found a constructor - can get rid of C-style initializer
819 delete ctorInit->init;
820 ctorInit->init = nullptr;
821
822 // intrinsic single parameter constructors and destructors do nothing. Since this was
823 // implicitly generated, there's no way for it to have side effects, so get rid of it
824 // to clean up generated code.
825 if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->ctor ) ) {
826 delete ctorInit->ctor;
827 ctorInit->ctor = nullptr;
828 }
829
830 if ( InitTweak::isIntrinsicSingleArgCallStmt( ctorInit->dtor ) ) {
831 delete ctorInit->dtor;
832 ctorInit->dtor = nullptr;
833 }
834
835 // xxx - todo -- what about arrays?
836 // if ( dtor == NULL && InitTweak::isIntrinsicCallStmt( ctorInit->get_ctor() ) ) {
837 // // can reduce the constructor down to a SingleInit using the
838 // // second argument from the ctor call, since
839 // delete ctorInit->get_ctor();
840 // ctorInit->set_ctor( NULL );
841
842 // Expression * arg =
843 // ctorInit->set_init( new SingleInit( arg ) );
844 // }
845 }
846} // namespace ResolvExpr
847
848// Local Variables: //
849// tab-width: 4 //
850// mode: c++ //
851// compile-command: "make install" //
852// End: //
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