SemaDeclCXX.cpp revision 6347f420ee0b097c0e642dc6c51afee5f1b14235
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclVisitor.h" 19#include "clang/AST/TypeOrdering.h" 20#include "clang/AST/StmtVisitor.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Parse/DeclSpec.h" 23#include "llvm/ADT/STLExtras.h" 24#include "llvm/Support/Compiler.h" 25#include <algorithm> // for std::equal 26#include <map> 27 28using namespace clang; 29 30//===----------------------------------------------------------------------===// 31// CheckDefaultArgumentVisitor 32//===----------------------------------------------------------------------===// 33 34namespace { 35 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 36 /// the default argument of a parameter to determine whether it 37 /// contains any ill-formed subexpressions. For example, this will 38 /// diagnose the use of local variables or parameters within the 39 /// default argument expression. 40 class VISIBILITY_HIDDEN CheckDefaultArgumentVisitor 41 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 42 Expr *DefaultArg; 43 Sema *S; 44 45 public: 46 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 47 : DefaultArg(defarg), S(s) {} 48 49 bool VisitExpr(Expr *Node); 50 bool VisitDeclRefExpr(DeclRefExpr *DRE); 51 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 52 }; 53 54 /// VisitExpr - Visit all of the children of this expression. 55 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 56 bool IsInvalid = false; 57 for (Stmt::child_iterator I = Node->child_begin(), 58 E = Node->child_end(); I != E; ++I) 59 IsInvalid |= Visit(*I); 60 return IsInvalid; 61 } 62 63 /// VisitDeclRefExpr - Visit a reference to a declaration, to 64 /// determine whether this declaration can be used in the default 65 /// argument expression. 66 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 67 NamedDecl *Decl = DRE->getDecl(); 68 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 69 // C++ [dcl.fct.default]p9 70 // Default arguments are evaluated each time the function is 71 // called. The order of evaluation of function arguments is 72 // unspecified. Consequently, parameters of a function shall not 73 // be used in default argument expressions, even if they are not 74 // evaluated. Parameters of a function declared before a default 75 // argument expression are in scope and can hide namespace and 76 // class member names. 77 return S->Diag(DRE->getSourceRange().getBegin(), 78 diag::err_param_default_argument_references_param) 79 << Param->getDeclName() << DefaultArg->getSourceRange(); 80 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 81 // C++ [dcl.fct.default]p7 82 // Local variables shall not be used in default argument 83 // expressions. 84 if (VDecl->isBlockVarDecl()) 85 return S->Diag(DRE->getSourceRange().getBegin(), 86 diag::err_param_default_argument_references_local) 87 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 88 } 89 90 return false; 91 } 92 93 /// VisitCXXThisExpr - Visit a C++ "this" expression. 94 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 95 // C++ [dcl.fct.default]p8: 96 // The keyword this shall not be used in a default argument of a 97 // member function. 98 return S->Diag(ThisE->getSourceRange().getBegin(), 99 diag::err_param_default_argument_references_this) 100 << ThisE->getSourceRange(); 101 } 102} 103 104/// ActOnParamDefaultArgument - Check whether the default argument 105/// provided for a function parameter is well-formed. If so, attach it 106/// to the parameter declaration. 107void 108Sema::ActOnParamDefaultArgument(DeclPtrTy param, SourceLocation EqualLoc, 109 ExprArg defarg) { 110 if (!param || !defarg.get()) 111 return; 112 113 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 114 UnparsedDefaultArgLocs.erase(Param); 115 116 ExprOwningPtr<Expr> DefaultArg(this, defarg.takeAs<Expr>()); 117 QualType ParamType = Param->getType(); 118 119 // Default arguments are only permitted in C++ 120 if (!getLangOptions().CPlusPlus) { 121 Diag(EqualLoc, diag::err_param_default_argument) 122 << DefaultArg->getSourceRange(); 123 Param->setInvalidDecl(); 124 return; 125 } 126 127 // C++ [dcl.fct.default]p5 128 // A default argument expression is implicitly converted (clause 129 // 4) to the parameter type. The default argument expression has 130 // the same semantic constraints as the initializer expression in 131 // a declaration of a variable of the parameter type, using the 132 // copy-initialization semantics (8.5). 133 Expr *DefaultArgPtr = DefaultArg.get(); 134 bool DefaultInitFailed = CheckInitializerTypes(DefaultArgPtr, ParamType, 135 EqualLoc, 136 Param->getDeclName(), 137 /*DirectInit=*/false); 138 if (DefaultArgPtr != DefaultArg.get()) { 139 DefaultArg.take(); 140 DefaultArg.reset(DefaultArgPtr); 141 } 142 if (DefaultInitFailed) { 143 return; 144 } 145 146 // Check that the default argument is well-formed 147 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg.get(), this); 148 if (DefaultArgChecker.Visit(DefaultArg.get())) { 149 Param->setInvalidDecl(); 150 return; 151 } 152 153 DefaultArgPtr = MaybeCreateCXXExprWithTemporaries(DefaultArg.take(), 154 /*DestroyTemps=*/false); 155 156 // Okay: add the default argument to the parameter 157 Param->setDefaultArg(DefaultArgPtr); 158} 159 160/// ActOnParamUnparsedDefaultArgument - We've seen a default 161/// argument for a function parameter, but we can't parse it yet 162/// because we're inside a class definition. Note that this default 163/// argument will be parsed later. 164void Sema::ActOnParamUnparsedDefaultArgument(DeclPtrTy param, 165 SourceLocation EqualLoc, 166 SourceLocation ArgLoc) { 167 if (!param) 168 return; 169 170 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 171 if (Param) 172 Param->setUnparsedDefaultArg(); 173 174 UnparsedDefaultArgLocs[Param] = ArgLoc; 175} 176 177/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 178/// the default argument for the parameter param failed. 179void Sema::ActOnParamDefaultArgumentError(DeclPtrTy param) { 180 if (!param) 181 return; 182 183 ParmVarDecl *Param = cast<ParmVarDecl>(param.getAs<Decl>()); 184 185 Param->setInvalidDecl(); 186 187 UnparsedDefaultArgLocs.erase(Param); 188} 189 190/// CheckExtraCXXDefaultArguments - Check for any extra default 191/// arguments in the declarator, which is not a function declaration 192/// or definition and therefore is not permitted to have default 193/// arguments. This routine should be invoked for every declarator 194/// that is not a function declaration or definition. 195void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 196 // C++ [dcl.fct.default]p3 197 // A default argument expression shall be specified only in the 198 // parameter-declaration-clause of a function declaration or in a 199 // template-parameter (14.1). It shall not be specified for a 200 // parameter pack. If it is specified in a 201 // parameter-declaration-clause, it shall not occur within a 202 // declarator or abstract-declarator of a parameter-declaration. 203 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 204 DeclaratorChunk &chunk = D.getTypeObject(i); 205 if (chunk.Kind == DeclaratorChunk::Function) { 206 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 207 ParmVarDecl *Param = 208 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param.getAs<Decl>()); 209 if (Param->hasUnparsedDefaultArg()) { 210 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 211 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 212 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 213 delete Toks; 214 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 215 } else if (Param->getDefaultArg()) { 216 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 217 << Param->getDefaultArg()->getSourceRange(); 218 Param->setDefaultArg(0); 219 } 220 } 221 } 222 } 223} 224 225// MergeCXXFunctionDecl - Merge two declarations of the same C++ 226// function, once we already know that they have the same 227// type. Subroutine of MergeFunctionDecl. Returns true if there was an 228// error, false otherwise. 229bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old) { 230 bool Invalid = false; 231 232 // C++ [dcl.fct.default]p4: 233 // 234 // For non-template functions, default arguments can be added in 235 // later declarations of a function in the same 236 // scope. Declarations in different scopes have completely 237 // distinct sets of default arguments. That is, declarations in 238 // inner scopes do not acquire default arguments from 239 // declarations in outer scopes, and vice versa. In a given 240 // function declaration, all parameters subsequent to a 241 // parameter with a default argument shall have default 242 // arguments supplied in this or previous declarations. A 243 // default argument shall not be redefined by a later 244 // declaration (not even to the same value). 245 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 246 ParmVarDecl *OldParam = Old->getParamDecl(p); 247 ParmVarDecl *NewParam = New->getParamDecl(p); 248 249 if(OldParam->getDefaultArg() && NewParam->getDefaultArg()) { 250 Diag(NewParam->getLocation(), 251 diag::err_param_default_argument_redefinition) 252 << NewParam->getDefaultArg()->getSourceRange(); 253 Diag(OldParam->getLocation(), diag::note_previous_definition); 254 Invalid = true; 255 } else if (OldParam->getDefaultArg()) { 256 // Merge the old default argument into the new parameter 257 NewParam->setDefaultArg(OldParam->getDefaultArg()); 258 } 259 } 260 261 if (CheckEquivalentExceptionSpec( 262 Old->getType()->getAsFunctionProtoType(), Old->getLocation(), 263 New->getType()->getAsFunctionProtoType(), New->getLocation())) { 264 Invalid = true; 265 } 266 267 return Invalid; 268} 269 270/// CheckCXXDefaultArguments - Verify that the default arguments for a 271/// function declaration are well-formed according to C++ 272/// [dcl.fct.default]. 273void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 274 unsigned NumParams = FD->getNumParams(); 275 unsigned p; 276 277 // Find first parameter with a default argument 278 for (p = 0; p < NumParams; ++p) { 279 ParmVarDecl *Param = FD->getParamDecl(p); 280 if (Param->getDefaultArg()) 281 break; 282 } 283 284 // C++ [dcl.fct.default]p4: 285 // In a given function declaration, all parameters 286 // subsequent to a parameter with a default argument shall 287 // have default arguments supplied in this or previous 288 // declarations. A default argument shall not be redefined 289 // by a later declaration (not even to the same value). 290 unsigned LastMissingDefaultArg = 0; 291 for(; p < NumParams; ++p) { 292 ParmVarDecl *Param = FD->getParamDecl(p); 293 if (!Param->getDefaultArg()) { 294 if (Param->isInvalidDecl()) 295 /* We already complained about this parameter. */; 296 else if (Param->getIdentifier()) 297 Diag(Param->getLocation(), 298 diag::err_param_default_argument_missing_name) 299 << Param->getIdentifier(); 300 else 301 Diag(Param->getLocation(), 302 diag::err_param_default_argument_missing); 303 304 LastMissingDefaultArg = p; 305 } 306 } 307 308 if (LastMissingDefaultArg > 0) { 309 // Some default arguments were missing. Clear out all of the 310 // default arguments up to (and including) the last missing 311 // default argument, so that we leave the function parameters 312 // in a semantically valid state. 313 for (p = 0; p <= LastMissingDefaultArg; ++p) { 314 ParmVarDecl *Param = FD->getParamDecl(p); 315 if (Param->hasDefaultArg()) { 316 if (!Param->hasUnparsedDefaultArg()) 317 Param->getDefaultArg()->Destroy(Context); 318 Param->setDefaultArg(0); 319 } 320 } 321 } 322} 323 324/// isCurrentClassName - Determine whether the identifier II is the 325/// name of the class type currently being defined. In the case of 326/// nested classes, this will only return true if II is the name of 327/// the innermost class. 328bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 329 const CXXScopeSpec *SS) { 330 CXXRecordDecl *CurDecl; 331 if (SS && SS->isSet() && !SS->isInvalid()) { 332 DeclContext *DC = computeDeclContext(*SS); 333 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 334 } else 335 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 336 337 if (CurDecl) 338 return &II == CurDecl->getIdentifier(); 339 else 340 return false; 341} 342 343/// \brief Check the validity of a C++ base class specifier. 344/// 345/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 346/// and returns NULL otherwise. 347CXXBaseSpecifier * 348Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 349 SourceRange SpecifierRange, 350 bool Virtual, AccessSpecifier Access, 351 QualType BaseType, 352 SourceLocation BaseLoc) { 353 // C++ [class.union]p1: 354 // A union shall not have base classes. 355 if (Class->isUnion()) { 356 Diag(Class->getLocation(), diag::err_base_clause_on_union) 357 << SpecifierRange; 358 return 0; 359 } 360 361 if (BaseType->isDependentType()) 362 return new CXXBaseSpecifier(SpecifierRange, Virtual, 363 Class->getTagKind() == RecordDecl::TK_class, 364 Access, BaseType); 365 366 // Base specifiers must be record types. 367 if (!BaseType->isRecordType()) { 368 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 369 return 0; 370 } 371 372 // C++ [class.union]p1: 373 // A union shall not be used as a base class. 374 if (BaseType->isUnionType()) { 375 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 376 return 0; 377 } 378 379 // C++ [class.derived]p2: 380 // The class-name in a base-specifier shall not be an incompletely 381 // defined class. 382 if (RequireCompleteType(BaseLoc, BaseType, diag::err_incomplete_base_class, 383 SpecifierRange)) 384 return 0; 385 386 // If the base class is polymorphic, the new one is, too. 387 RecordDecl *BaseDecl = BaseType->getAsRecordType()->getDecl(); 388 assert(BaseDecl && "Record type has no declaration"); 389 BaseDecl = BaseDecl->getDefinition(Context); 390 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 391 if (cast<CXXRecordDecl>(BaseDecl)->isPolymorphic()) 392 Class->setPolymorphic(true); 393 394 // C++ [dcl.init.aggr]p1: 395 // An aggregate is [...] a class with [...] no base classes [...]. 396 Class->setAggregate(false); 397 Class->setPOD(false); 398 399 if (Virtual) { 400 // C++ [class.ctor]p5: 401 // A constructor is trivial if its class has no virtual base classes. 402 Class->setHasTrivialConstructor(false); 403 } else { 404 // C++ [class.ctor]p5: 405 // A constructor is trivial if all the direct base classes of its 406 // class have trivial constructors. 407 Class->setHasTrivialConstructor(cast<CXXRecordDecl>(BaseDecl)-> 408 hasTrivialConstructor()); 409 } 410 411 // C++ [class.ctor]p3: 412 // A destructor is trivial if all the direct base classes of its class 413 // have trivial destructors. 414 Class->setHasTrivialDestructor(cast<CXXRecordDecl>(BaseDecl)-> 415 hasTrivialDestructor()); 416 417 // Create the base specifier. 418 // FIXME: Allocate via ASTContext? 419 return new CXXBaseSpecifier(SpecifierRange, Virtual, 420 Class->getTagKind() == RecordDecl::TK_class, 421 Access, BaseType); 422} 423 424/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 425/// one entry in the base class list of a class specifier, for 426/// example: 427/// class foo : public bar, virtual private baz { 428/// 'public bar' and 'virtual private baz' are each base-specifiers. 429Sema::BaseResult 430Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 431 bool Virtual, AccessSpecifier Access, 432 TypeTy *basetype, SourceLocation BaseLoc) { 433 if (!classdecl) 434 return true; 435 436 AdjustDeclIfTemplate(classdecl); 437 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 438 QualType BaseType = QualType::getFromOpaquePtr(basetype); 439 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 440 Virtual, Access, 441 BaseType, BaseLoc)) 442 return BaseSpec; 443 444 return true; 445} 446 447/// \brief Performs the actual work of attaching the given base class 448/// specifiers to a C++ class. 449bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 450 unsigned NumBases) { 451 if (NumBases == 0) 452 return false; 453 454 // Used to keep track of which base types we have already seen, so 455 // that we can properly diagnose redundant direct base types. Note 456 // that the key is always the unqualified canonical type of the base 457 // class. 458 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 459 460 // Copy non-redundant base specifiers into permanent storage. 461 unsigned NumGoodBases = 0; 462 bool Invalid = false; 463 for (unsigned idx = 0; idx < NumBases; ++idx) { 464 QualType NewBaseType 465 = Context.getCanonicalType(Bases[idx]->getType()); 466 NewBaseType = NewBaseType.getUnqualifiedType(); 467 468 if (KnownBaseTypes[NewBaseType]) { 469 // C++ [class.mi]p3: 470 // A class shall not be specified as a direct base class of a 471 // derived class more than once. 472 Diag(Bases[idx]->getSourceRange().getBegin(), 473 diag::err_duplicate_base_class) 474 << KnownBaseTypes[NewBaseType]->getType() 475 << Bases[idx]->getSourceRange(); 476 477 // Delete the duplicate base class specifier; we're going to 478 // overwrite its pointer later. 479 delete Bases[idx]; 480 481 Invalid = true; 482 } else { 483 // Okay, add this new base class. 484 KnownBaseTypes[NewBaseType] = Bases[idx]; 485 Bases[NumGoodBases++] = Bases[idx]; 486 } 487 } 488 489 // Attach the remaining base class specifiers to the derived class. 490 Class->setBases(Context, Bases, NumGoodBases); 491 492 // Delete the remaining (good) base class specifiers, since their 493 // data has been copied into the CXXRecordDecl. 494 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 495 delete Bases[idx]; 496 497 return Invalid; 498} 499 500/// ActOnBaseSpecifiers - Attach the given base specifiers to the 501/// class, after checking whether there are any duplicate base 502/// classes. 503void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 504 unsigned NumBases) { 505 if (!ClassDecl || !Bases || !NumBases) 506 return; 507 508 AdjustDeclIfTemplate(ClassDecl); 509 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 510 (CXXBaseSpecifier**)(Bases), NumBases); 511} 512 513//===----------------------------------------------------------------------===// 514// C++ class member Handling 515//===----------------------------------------------------------------------===// 516 517/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 518/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 519/// bitfield width if there is one and 'InitExpr' specifies the initializer if 520/// any. 521Sema::DeclPtrTy 522Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 523 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 524 const DeclSpec &DS = D.getDeclSpec(); 525 DeclarationName Name = GetNameForDeclarator(D); 526 Expr *BitWidth = static_cast<Expr*>(BW); 527 Expr *Init = static_cast<Expr*>(InitExpr); 528 SourceLocation Loc = D.getIdentifierLoc(); 529 530 bool isFunc = D.isFunctionDeclarator(); 531 532 // C++ 9.2p6: A member shall not be declared to have automatic storage 533 // duration (auto, register) or with the extern storage-class-specifier. 534 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 535 // data members and cannot be applied to names declared const or static, 536 // and cannot be applied to reference members. 537 switch (DS.getStorageClassSpec()) { 538 case DeclSpec::SCS_unspecified: 539 case DeclSpec::SCS_typedef: 540 case DeclSpec::SCS_static: 541 // FALL THROUGH. 542 break; 543 case DeclSpec::SCS_mutable: 544 if (isFunc) { 545 if (DS.getStorageClassSpecLoc().isValid()) 546 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 547 else 548 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 549 550 // FIXME: It would be nicer if the keyword was ignored only for this 551 // declarator. Otherwise we could get follow-up errors. 552 D.getMutableDeclSpec().ClearStorageClassSpecs(); 553 } else { 554 QualType T = GetTypeForDeclarator(D, S); 555 diag::kind err = static_cast<diag::kind>(0); 556 if (T->isReferenceType()) 557 err = diag::err_mutable_reference; 558 else if (T.isConstQualified()) 559 err = diag::err_mutable_const; 560 if (err != 0) { 561 if (DS.getStorageClassSpecLoc().isValid()) 562 Diag(DS.getStorageClassSpecLoc(), err); 563 else 564 Diag(DS.getThreadSpecLoc(), err); 565 // FIXME: It would be nicer if the keyword was ignored only for this 566 // declarator. Otherwise we could get follow-up errors. 567 D.getMutableDeclSpec().ClearStorageClassSpecs(); 568 } 569 } 570 break; 571 default: 572 if (DS.getStorageClassSpecLoc().isValid()) 573 Diag(DS.getStorageClassSpecLoc(), 574 diag::err_storageclass_invalid_for_member); 575 else 576 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 577 D.getMutableDeclSpec().ClearStorageClassSpecs(); 578 } 579 580 if (!isFunc && 581 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 582 D.getNumTypeObjects() == 0) { 583 // Check also for this case: 584 // 585 // typedef int f(); 586 // f a; 587 // 588 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 589 isFunc = TDType->isFunctionType(); 590 } 591 592 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 593 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 594 !isFunc); 595 596 Decl *Member; 597 if (isInstField) { 598 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 599 AS); 600 assert(Member && "HandleField never returns null"); 601 } else { 602 Member = ActOnDeclarator(S, D).getAs<Decl>(); 603 if (!Member) { 604 if (BitWidth) DeleteExpr(BitWidth); 605 return DeclPtrTy(); 606 } 607 608 // Non-instance-fields can't have a bitfield. 609 if (BitWidth) { 610 if (Member->isInvalidDecl()) { 611 // don't emit another diagnostic. 612 } else if (isa<VarDecl>(Member)) { 613 // C++ 9.6p3: A bit-field shall not be a static member. 614 // "static member 'A' cannot be a bit-field" 615 Diag(Loc, diag::err_static_not_bitfield) 616 << Name << BitWidth->getSourceRange(); 617 } else if (isa<TypedefDecl>(Member)) { 618 // "typedef member 'x' cannot be a bit-field" 619 Diag(Loc, diag::err_typedef_not_bitfield) 620 << Name << BitWidth->getSourceRange(); 621 } else { 622 // A function typedef ("typedef int f(); f a;"). 623 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 624 Diag(Loc, diag::err_not_integral_type_bitfield) 625 << Name << cast<ValueDecl>(Member)->getType() 626 << BitWidth->getSourceRange(); 627 } 628 629 DeleteExpr(BitWidth); 630 BitWidth = 0; 631 Member->setInvalidDecl(); 632 } 633 634 Member->setAccess(AS); 635 } 636 637 assert((Name || isInstField) && "No identifier for non-field ?"); 638 639 if (Init) 640 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 641 if (Deleted) // FIXME: Source location is not very good. 642 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 643 644 if (isInstField) { 645 FieldCollector->Add(cast<FieldDecl>(Member)); 646 return DeclPtrTy(); 647 } 648 return DeclPtrTy::make(Member); 649} 650 651/// ActOnMemInitializer - Handle a C++ member initializer. 652Sema::MemInitResult 653Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 654 Scope *S, 655 const CXXScopeSpec &SS, 656 IdentifierInfo *MemberOrBase, 657 TypeTy *TemplateTypeTy, 658 SourceLocation IdLoc, 659 SourceLocation LParenLoc, 660 ExprTy **Args, unsigned NumArgs, 661 SourceLocation *CommaLocs, 662 SourceLocation RParenLoc) { 663 if (!ConstructorD) 664 return true; 665 666 CXXConstructorDecl *Constructor 667 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 668 if (!Constructor) { 669 // The user wrote a constructor initializer on a function that is 670 // not a C++ constructor. Ignore the error for now, because we may 671 // have more member initializers coming; we'll diagnose it just 672 // once in ActOnMemInitializers. 673 return true; 674 } 675 676 CXXRecordDecl *ClassDecl = Constructor->getParent(); 677 678 // C++ [class.base.init]p2: 679 // Names in a mem-initializer-id are looked up in the scope of the 680 // constructor’s class and, if not found in that scope, are looked 681 // up in the scope containing the constructor’s 682 // definition. [Note: if the constructor’s class contains a member 683 // with the same name as a direct or virtual base class of the 684 // class, a mem-initializer-id naming the member or base class and 685 // composed of a single identifier refers to the class member. A 686 // mem-initializer-id for the hidden base class may be specified 687 // using a qualified name. ] 688 if (!SS.getScopeRep() && !TemplateTypeTy) { 689 // Look for a member, first. 690 FieldDecl *Member = 0; 691 DeclContext::lookup_result Result 692 = ClassDecl->lookup(MemberOrBase); 693 if (Result.first != Result.second) 694 Member = dyn_cast<FieldDecl>(*Result.first); 695 696 // FIXME: Handle members of an anonymous union. 697 698 if (Member) { 699 // FIXME: Perform direct initialization of the member. 700 return new CXXBaseOrMemberInitializer(Member, (Expr **)Args, NumArgs, 701 IdLoc); 702 } 703 } 704 // It didn't name a member, so see if it names a class. 705 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 706 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 707 if (!BaseTy) 708 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 709 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 710 711 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 712 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 713 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 714 << BaseType << SourceRange(IdLoc, RParenLoc); 715 716 // C++ [class.base.init]p2: 717 // [...] Unless the mem-initializer-id names a nonstatic data 718 // member of the constructor’s class or a direct or virtual base 719 // of that class, the mem-initializer is ill-formed. A 720 // mem-initializer-list can initialize a base class using any 721 // name that denotes that base class type. 722 723 // First, check for a direct base class. 724 const CXXBaseSpecifier *DirectBaseSpec = 0; 725 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 726 Base != ClassDecl->bases_end(); ++Base) { 727 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 728 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 729 // We found a direct base of this type. That's what we're 730 // initializing. 731 DirectBaseSpec = &*Base; 732 break; 733 } 734 } 735 736 // Check for a virtual base class. 737 // FIXME: We might be able to short-circuit this if we know in advance that 738 // there are no virtual bases. 739 const CXXBaseSpecifier *VirtualBaseSpec = 0; 740 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 741 // We haven't found a base yet; search the class hierarchy for a 742 // virtual base class. 743 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 744 /*DetectVirtual=*/false); 745 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 746 for (BasePaths::paths_iterator Path = Paths.begin(); 747 Path != Paths.end(); ++Path) { 748 if (Path->back().Base->isVirtual()) { 749 VirtualBaseSpec = Path->back().Base; 750 break; 751 } 752 } 753 } 754 } 755 756 // C++ [base.class.init]p2: 757 // If a mem-initializer-id is ambiguous because it designates both 758 // a direct non-virtual base class and an inherited virtual base 759 // class, the mem-initializer is ill-formed. 760 if (DirectBaseSpec && VirtualBaseSpec) 761 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 762 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 763 // C++ [base.class.init]p2: 764 // Unless the mem-initializer-id names a nonstatic data membeer of the 765 // constructor's class ot a direst or virtual base of that class, the 766 // mem-initializer is ill-formed. 767 if (!DirectBaseSpec && !VirtualBaseSpec) 768 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 769 << BaseType << ClassDecl->getNameAsCString() 770 << SourceRange(IdLoc, RParenLoc); 771 772 773 return new CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, NumArgs, 774 IdLoc); 775} 776 777static void *GetKeyForTopLevelField(FieldDecl *Field) { 778 // For anonymous unions, use the class declaration as the key. 779 if (const RecordType *RT = Field->getType()->getAsRecordType()) { 780 if (RT->getDecl()->isAnonymousStructOrUnion()) 781 return static_cast<void *>(RT->getDecl()); 782 } 783 return static_cast<void *>(Field); 784} 785 786static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 787 // For fields injected into the class via declaration of an anonymous union, 788 // use its anonymous union class declaration as the unique key. 789 if (FieldDecl *Field = Member->getMember()) { 790 if (Field->getDeclContext()->isRecord()) { 791 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 792 if (RD->isAnonymousStructOrUnion()) 793 return static_cast<void *>(RD); 794 } 795 return static_cast<void *>(Field); 796 } 797 return static_cast<RecordType *>(Member->getBaseClass()); 798} 799 800void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 801 SourceLocation ColonLoc, 802 MemInitTy **MemInits, unsigned NumMemInits) { 803 if (!ConstructorDecl) 804 return; 805 806 CXXConstructorDecl *Constructor 807 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 808 809 if (!Constructor) { 810 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 811 return; 812 } 813 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 814 bool err = false; 815 for (unsigned i = 0; i < NumMemInits; i++) { 816 CXXBaseOrMemberInitializer *Member = 817 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 818 void *KeyToMember = GetKeyForMember(Member); 819 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 820 if (!PrevMember) { 821 PrevMember = Member; 822 continue; 823 } 824 if (FieldDecl *Field = Member->getMember()) 825 Diag(Member->getSourceLocation(), 826 diag::error_multiple_mem_initialization) 827 << Field->getNameAsString(); 828 else { 829 Type *BaseClass = Member->getBaseClass(); 830 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 831 Diag(Member->getSourceLocation(), 832 diag::error_multiple_base_initialization) 833 << BaseClass->getDesugaredType(true); 834 } 835 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 836 << 0; 837 err = true; 838 } 839 if (!err) { 840 Constructor->setBaseOrMemberInitializers(Context, 841 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 842 NumMemInits); 843 } 844 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 845 != Diagnostic::Ignored || 846 Diags.getDiagnosticLevel(diag::warn_field_initialized) 847 != Diagnostic::Ignored)) { 848 // Also issue warning if order of ctor-initializer list does not match order 849 // of 1) base class declarations and 2) order of non-static data members. 850 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 851 852 CXXRecordDecl *ClassDecl 853 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 854 // Push virtual bases before others. 855 for (CXXRecordDecl::base_class_iterator VBase = 856 ClassDecl->vbases_begin(), 857 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 858 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 859 860 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 861 E = ClassDecl->bases_end(); Base != E; ++Base) { 862 // Virtuals are alread in the virtual base list and are constructed 863 // first. 864 if (Base->isVirtual()) 865 continue; 866 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 867 } 868 869 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 870 E = ClassDecl->field_end(); Field != E; ++Field) 871 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 872 873 int Last = AllBaseOrMembers.size(); 874 int curIndex = 0; 875 CXXBaseOrMemberInitializer *PrevMember = 0; 876 for (unsigned i = 0; i < NumMemInits; i++) { 877 CXXBaseOrMemberInitializer *Member = 878 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 879 void *MemberInCtorList = GetKeyForMember(Member); 880 881 for (; curIndex < Last; curIndex++) 882 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 883 break; 884 if (curIndex == Last) { 885 assert(PrevMember && "Member not in member list?!"); 886 // Initializer as specified in ctor-initializer list is out of order. 887 // Issue a warning diagnostic. 888 if (PrevMember->isBaseInitializer()) { 889 // Diagnostics is for an initialized base class. 890 Type *BaseClass = PrevMember->getBaseClass(); 891 Diag(PrevMember->getSourceLocation(), 892 diag::warn_base_initialized) 893 << BaseClass->getDesugaredType(true); 894 } 895 else { 896 FieldDecl *Field = PrevMember->getMember(); 897 Diag(PrevMember->getSourceLocation(), 898 diag::warn_field_initialized) 899 << Field->getNameAsString(); 900 } 901 // Also the note! 902 if (FieldDecl *Field = Member->getMember()) 903 Diag(Member->getSourceLocation(), 904 diag::note_fieldorbase_initialized_here) << 0 905 << Field->getNameAsString(); 906 else { 907 Type *BaseClass = Member->getBaseClass(); 908 Diag(Member->getSourceLocation(), 909 diag::note_fieldorbase_initialized_here) << 1 910 << BaseClass->getDesugaredType(true); 911 } 912 for (curIndex = 0; curIndex < Last; curIndex++) 913 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 914 break; 915 } 916 PrevMember = Member; 917 } 918 } 919} 920 921void Sema::ActOnDefaultCDtorInitializers(DeclPtrTy CDtorDecl) { 922 if (!CDtorDecl) 923 return; 924 925 if (CXXConstructorDecl *Constructor 926 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 927 Constructor->setBaseOrMemberInitializers(Context, 928 (CXXBaseOrMemberInitializer **)0, 0); 929 else 930 if (CXXDestructorDecl *Destructor 931 = dyn_cast<CXXDestructorDecl>(CDtorDecl.getAs<Decl>())) 932 Destructor->setBaseOrMemberDestructions(Context); 933} 934 935namespace { 936 /// PureVirtualMethodCollector - traverses a class and its superclasses 937 /// and determines if it has any pure virtual methods. 938 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 939 ASTContext &Context; 940 941 public: 942 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 943 944 private: 945 MethodList Methods; 946 947 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 948 949 public: 950 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 951 : Context(Ctx) { 952 953 MethodList List; 954 Collect(RD, List); 955 956 // Copy the temporary list to methods, and make sure to ignore any 957 // null entries. 958 for (size_t i = 0, e = List.size(); i != e; ++i) { 959 if (List[i]) 960 Methods.push_back(List[i]); 961 } 962 } 963 964 bool empty() const { return Methods.empty(); } 965 966 MethodList::const_iterator methods_begin() { return Methods.begin(); } 967 MethodList::const_iterator methods_end() { return Methods.end(); } 968 }; 969 970 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 971 MethodList& Methods) { 972 // First, collect the pure virtual methods for the base classes. 973 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 974 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 975 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 976 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 977 if (BaseDecl && BaseDecl->isAbstract()) 978 Collect(BaseDecl, Methods); 979 } 980 } 981 982 // Next, zero out any pure virtual methods that this class overrides. 983 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 984 985 MethodSetTy OverriddenMethods; 986 size_t MethodsSize = Methods.size(); 987 988 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 989 i != e; ++i) { 990 // Traverse the record, looking for methods. 991 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 992 // If the method is pure virtual, add it to the methods vector. 993 if (MD->isPure()) { 994 Methods.push_back(MD); 995 continue; 996 } 997 998 // Otherwise, record all the overridden methods in our set. 999 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1000 E = MD->end_overridden_methods(); I != E; ++I) { 1001 // Keep track of the overridden methods. 1002 OverriddenMethods.insert(*I); 1003 } 1004 } 1005 } 1006 1007 // Now go through the methods and zero out all the ones we know are 1008 // overridden. 1009 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1010 if (OverriddenMethods.count(Methods[i])) 1011 Methods[i] = 0; 1012 } 1013 1014 } 1015} 1016 1017bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1018 unsigned DiagID, AbstractDiagSelID SelID, 1019 const CXXRecordDecl *CurrentRD) { 1020 1021 if (!getLangOptions().CPlusPlus) 1022 return false; 1023 1024 if (const ArrayType *AT = Context.getAsArrayType(T)) 1025 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1026 CurrentRD); 1027 1028 if (const PointerType *PT = T->getAsPointerType()) { 1029 // Find the innermost pointer type. 1030 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1031 PT = T; 1032 1033 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1034 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1035 CurrentRD); 1036 } 1037 1038 const RecordType *RT = T->getAsRecordType(); 1039 if (!RT) 1040 return false; 1041 1042 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1043 if (!RD) 1044 return false; 1045 1046 if (CurrentRD && CurrentRD != RD) 1047 return false; 1048 1049 if (!RD->isAbstract()) 1050 return false; 1051 1052 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1053 1054 // Check if we've already emitted the list of pure virtual functions for this 1055 // class. 1056 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1057 return true; 1058 1059 PureVirtualMethodCollector Collector(Context, RD); 1060 1061 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1062 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1063 const CXXMethodDecl *MD = *I; 1064 1065 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1066 MD->getDeclName(); 1067 } 1068 1069 if (!PureVirtualClassDiagSet) 1070 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1071 PureVirtualClassDiagSet->insert(RD); 1072 1073 return true; 1074} 1075 1076namespace { 1077 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1078 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1079 Sema &SemaRef; 1080 CXXRecordDecl *AbstractClass; 1081 1082 bool VisitDeclContext(const DeclContext *DC) { 1083 bool Invalid = false; 1084 1085 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1086 E = DC->decls_end(); I != E; ++I) 1087 Invalid |= Visit(*I); 1088 1089 return Invalid; 1090 } 1091 1092 public: 1093 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1094 : SemaRef(SemaRef), AbstractClass(ac) { 1095 Visit(SemaRef.Context.getTranslationUnitDecl()); 1096 } 1097 1098 bool VisitFunctionDecl(const FunctionDecl *FD) { 1099 if (FD->isThisDeclarationADefinition()) { 1100 // No need to do the check if we're in a definition, because it requires 1101 // that the return/param types are complete. 1102 // because that requires 1103 return VisitDeclContext(FD); 1104 } 1105 1106 // Check the return type. 1107 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1108 bool Invalid = 1109 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1110 diag::err_abstract_type_in_decl, 1111 Sema::AbstractReturnType, 1112 AbstractClass); 1113 1114 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1115 E = FD->param_end(); I != E; ++I) { 1116 const ParmVarDecl *VD = *I; 1117 Invalid |= 1118 SemaRef.RequireNonAbstractType(VD->getLocation(), 1119 VD->getOriginalType(), 1120 diag::err_abstract_type_in_decl, 1121 Sema::AbstractParamType, 1122 AbstractClass); 1123 } 1124 1125 return Invalid; 1126 } 1127 1128 bool VisitDecl(const Decl* D) { 1129 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1130 return VisitDeclContext(DC); 1131 1132 return false; 1133 } 1134 }; 1135} 1136 1137void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1138 DeclPtrTy TagDecl, 1139 SourceLocation LBrac, 1140 SourceLocation RBrac) { 1141 if (!TagDecl) 1142 return; 1143 1144 AdjustDeclIfTemplate(TagDecl); 1145 ActOnFields(S, RLoc, TagDecl, 1146 (DeclPtrTy*)FieldCollector->getCurFields(), 1147 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1148 1149 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1150 if (!RD->isAbstract()) { 1151 // Collect all the pure virtual methods and see if this is an abstract 1152 // class after all. 1153 PureVirtualMethodCollector Collector(Context, RD); 1154 if (!Collector.empty()) 1155 RD->setAbstract(true); 1156 } 1157 1158 if (RD->isAbstract()) 1159 AbstractClassUsageDiagnoser(*this, RD); 1160 1161 if (RD->hasTrivialConstructor() || RD->hasTrivialDestructor()) { 1162 for (RecordDecl::field_iterator i = RD->field_begin(), e = RD->field_end(); 1163 i != e; ++i) { 1164 // All the nonstatic data members must have trivial constructors. 1165 QualType FTy = i->getType(); 1166 while (const ArrayType *AT = Context.getAsArrayType(FTy)) 1167 FTy = AT->getElementType(); 1168 1169 if (const RecordType *RT = FTy->getAsRecordType()) { 1170 CXXRecordDecl *FieldRD = cast<CXXRecordDecl>(RT->getDecl()); 1171 1172 if (!FieldRD->hasTrivialConstructor()) 1173 RD->setHasTrivialConstructor(false); 1174 if (!FieldRD->hasTrivialDestructor()) 1175 RD->setHasTrivialDestructor(false); 1176 1177 // If RD has neither a trivial constructor nor a trivial destructor 1178 // we don't need to continue checking. 1179 if (!RD->hasTrivialConstructor() && !RD->hasTrivialDestructor()) 1180 break; 1181 } 1182 } 1183 } 1184 1185 if (!RD->isDependentType()) 1186 AddImplicitlyDeclaredMembersToClass(RD); 1187} 1188 1189/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1190/// special functions, such as the default constructor, copy 1191/// constructor, or destructor, to the given C++ class (C++ 1192/// [special]p1). This routine can only be executed just before the 1193/// definition of the class is complete. 1194void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1195 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1196 ClassType = Context.getCanonicalType(ClassType); 1197 1198 // FIXME: Implicit declarations have exception specifications, which are 1199 // the union of the specifications of the implicitly called functions. 1200 1201 if (!ClassDecl->hasUserDeclaredConstructor()) { 1202 // C++ [class.ctor]p5: 1203 // A default constructor for a class X is a constructor of class X 1204 // that can be called without an argument. If there is no 1205 // user-declared constructor for class X, a default constructor is 1206 // implicitly declared. An implicitly-declared default constructor 1207 // is an inline public member of its class. 1208 DeclarationName Name 1209 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1210 CXXConstructorDecl *DefaultCon = 1211 CXXConstructorDecl::Create(Context, ClassDecl, 1212 ClassDecl->getLocation(), Name, 1213 Context.getFunctionType(Context.VoidTy, 1214 0, 0, false, 0), 1215 /*isExplicit=*/false, 1216 /*isInline=*/true, 1217 /*isImplicitlyDeclared=*/true); 1218 DefaultCon->setAccess(AS_public); 1219 DefaultCon->setImplicit(); 1220 ClassDecl->addDecl(DefaultCon); 1221 } 1222 1223 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1224 // C++ [class.copy]p4: 1225 // If the class definition does not explicitly declare a copy 1226 // constructor, one is declared implicitly. 1227 1228 // C++ [class.copy]p5: 1229 // The implicitly-declared copy constructor for a class X will 1230 // have the form 1231 // 1232 // X::X(const X&) 1233 // 1234 // if 1235 bool HasConstCopyConstructor = true; 1236 1237 // -- each direct or virtual base class B of X has a copy 1238 // constructor whose first parameter is of type const B& or 1239 // const volatile B&, and 1240 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1241 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1242 const CXXRecordDecl *BaseClassDecl 1243 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1244 HasConstCopyConstructor 1245 = BaseClassDecl->hasConstCopyConstructor(Context); 1246 } 1247 1248 // -- for all the nonstatic data members of X that are of a 1249 // class type M (or array thereof), each such class type 1250 // has a copy constructor whose first parameter is of type 1251 // const M& or const volatile M&. 1252 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1253 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1254 ++Field) { 1255 QualType FieldType = (*Field)->getType(); 1256 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1257 FieldType = Array->getElementType(); 1258 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1259 const CXXRecordDecl *FieldClassDecl 1260 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1261 HasConstCopyConstructor 1262 = FieldClassDecl->hasConstCopyConstructor(Context); 1263 } 1264 } 1265 1266 // Otherwise, the implicitly declared copy constructor will have 1267 // the form 1268 // 1269 // X::X(X&) 1270 QualType ArgType = ClassType; 1271 if (HasConstCopyConstructor) 1272 ArgType = ArgType.withConst(); 1273 ArgType = Context.getLValueReferenceType(ArgType); 1274 1275 // An implicitly-declared copy constructor is an inline public 1276 // member of its class. 1277 DeclarationName Name 1278 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1279 CXXConstructorDecl *CopyConstructor 1280 = CXXConstructorDecl::Create(Context, ClassDecl, 1281 ClassDecl->getLocation(), Name, 1282 Context.getFunctionType(Context.VoidTy, 1283 &ArgType, 1, 1284 false, 0), 1285 /*isExplicit=*/false, 1286 /*isInline=*/true, 1287 /*isImplicitlyDeclared=*/true); 1288 CopyConstructor->setAccess(AS_public); 1289 CopyConstructor->setImplicit(); 1290 1291 // Add the parameter to the constructor. 1292 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1293 ClassDecl->getLocation(), 1294 /*IdentifierInfo=*/0, 1295 ArgType, VarDecl::None, 0); 1296 CopyConstructor->setParams(Context, &FromParam, 1); 1297 ClassDecl->addDecl(CopyConstructor); 1298 } 1299 1300 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1301 // Note: The following rules are largely analoguous to the copy 1302 // constructor rules. Note that virtual bases are not taken into account 1303 // for determining the argument type of the operator. Note also that 1304 // operators taking an object instead of a reference are allowed. 1305 // 1306 // C++ [class.copy]p10: 1307 // If the class definition does not explicitly declare a copy 1308 // assignment operator, one is declared implicitly. 1309 // The implicitly-defined copy assignment operator for a class X 1310 // will have the form 1311 // 1312 // X& X::operator=(const X&) 1313 // 1314 // if 1315 bool HasConstCopyAssignment = true; 1316 1317 // -- each direct base class B of X has a copy assignment operator 1318 // whose parameter is of type const B&, const volatile B& or B, 1319 // and 1320 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1321 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1322 const CXXRecordDecl *BaseClassDecl 1323 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1324 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1325 } 1326 1327 // -- for all the nonstatic data members of X that are of a class 1328 // type M (or array thereof), each such class type has a copy 1329 // assignment operator whose parameter is of type const M&, 1330 // const volatile M& or M. 1331 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1332 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1333 ++Field) { 1334 QualType FieldType = (*Field)->getType(); 1335 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1336 FieldType = Array->getElementType(); 1337 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1338 const CXXRecordDecl *FieldClassDecl 1339 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1340 HasConstCopyAssignment 1341 = FieldClassDecl->hasConstCopyAssignment(Context); 1342 } 1343 } 1344 1345 // Otherwise, the implicitly declared copy assignment operator will 1346 // have the form 1347 // 1348 // X& X::operator=(X&) 1349 QualType ArgType = ClassType; 1350 QualType RetType = Context.getLValueReferenceType(ArgType); 1351 if (HasConstCopyAssignment) 1352 ArgType = ArgType.withConst(); 1353 ArgType = Context.getLValueReferenceType(ArgType); 1354 1355 // An implicitly-declared copy assignment operator is an inline public 1356 // member of its class. 1357 DeclarationName Name = 1358 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1359 CXXMethodDecl *CopyAssignment = 1360 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1361 Context.getFunctionType(RetType, &ArgType, 1, 1362 false, 0), 1363 /*isStatic=*/false, /*isInline=*/true); 1364 CopyAssignment->setAccess(AS_public); 1365 CopyAssignment->setImplicit(); 1366 1367 // Add the parameter to the operator. 1368 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1369 ClassDecl->getLocation(), 1370 /*IdentifierInfo=*/0, 1371 ArgType, VarDecl::None, 0); 1372 CopyAssignment->setParams(Context, &FromParam, 1); 1373 1374 // Don't call addedAssignmentOperator. There is no way to distinguish an 1375 // implicit from an explicit assignment operator. 1376 ClassDecl->addDecl(CopyAssignment); 1377 } 1378 1379 if (!ClassDecl->hasUserDeclaredDestructor()) { 1380 // C++ [class.dtor]p2: 1381 // If a class has no user-declared destructor, a destructor is 1382 // declared implicitly. An implicitly-declared destructor is an 1383 // inline public member of its class. 1384 DeclarationName Name 1385 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1386 CXXDestructorDecl *Destructor 1387 = CXXDestructorDecl::Create(Context, ClassDecl, 1388 ClassDecl->getLocation(), Name, 1389 Context.getFunctionType(Context.VoidTy, 1390 0, 0, false, 0), 1391 /*isInline=*/true, 1392 /*isImplicitlyDeclared=*/true); 1393 Destructor->setAccess(AS_public); 1394 Destructor->setImplicit(); 1395 ClassDecl->addDecl(Destructor); 1396 } 1397} 1398 1399void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1400 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1401 if (!Template) 1402 return; 1403 1404 TemplateParameterList *Params = Template->getTemplateParameters(); 1405 for (TemplateParameterList::iterator Param = Params->begin(), 1406 ParamEnd = Params->end(); 1407 Param != ParamEnd; ++Param) { 1408 NamedDecl *Named = cast<NamedDecl>(*Param); 1409 if (Named->getDeclName()) { 1410 S->AddDecl(DeclPtrTy::make(Named)); 1411 IdResolver.AddDecl(Named); 1412 } 1413 } 1414} 1415 1416/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1417/// parsing a top-level (non-nested) C++ class, and we are now 1418/// parsing those parts of the given Method declaration that could 1419/// not be parsed earlier (C++ [class.mem]p2), such as default 1420/// arguments. This action should enter the scope of the given 1421/// Method declaration as if we had just parsed the qualified method 1422/// name. However, it should not bring the parameters into scope; 1423/// that will be performed by ActOnDelayedCXXMethodParameter. 1424void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1425 if (!MethodD) 1426 return; 1427 1428 CXXScopeSpec SS; 1429 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1430 QualType ClassTy 1431 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1432 SS.setScopeRep( 1433 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1434 ActOnCXXEnterDeclaratorScope(S, SS); 1435} 1436 1437/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1438/// C++ method declaration. We're (re-)introducing the given 1439/// function parameter into scope for use in parsing later parts of 1440/// the method declaration. For example, we could see an 1441/// ActOnParamDefaultArgument event for this parameter. 1442void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1443 if (!ParamD) 1444 return; 1445 1446 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1447 1448 // If this parameter has an unparsed default argument, clear it out 1449 // to make way for the parsed default argument. 1450 if (Param->hasUnparsedDefaultArg()) 1451 Param->setDefaultArg(0); 1452 1453 S->AddDecl(DeclPtrTy::make(Param)); 1454 if (Param->getDeclName()) 1455 IdResolver.AddDecl(Param); 1456} 1457 1458/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1459/// processing the delayed method declaration for Method. The method 1460/// declaration is now considered finished. There may be a separate 1461/// ActOnStartOfFunctionDef action later (not necessarily 1462/// immediately!) for this method, if it was also defined inside the 1463/// class body. 1464void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1465 if (!MethodD) 1466 return; 1467 1468 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1469 CXXScopeSpec SS; 1470 QualType ClassTy 1471 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1472 SS.setScopeRep( 1473 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1474 ActOnCXXExitDeclaratorScope(S, SS); 1475 1476 // Now that we have our default arguments, check the constructor 1477 // again. It could produce additional diagnostics or affect whether 1478 // the class has implicitly-declared destructors, among other 1479 // things. 1480 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1481 CheckConstructor(Constructor); 1482 1483 // Check the default arguments, which we may have added. 1484 if (!Method->isInvalidDecl()) 1485 CheckCXXDefaultArguments(Method); 1486} 1487 1488/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1489/// the well-formedness of the constructor declarator @p D with type @p 1490/// R. If there are any errors in the declarator, this routine will 1491/// emit diagnostics and set the invalid bit to true. In any case, the type 1492/// will be updated to reflect a well-formed type for the constructor and 1493/// returned. 1494QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1495 FunctionDecl::StorageClass &SC) { 1496 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1497 1498 // C++ [class.ctor]p3: 1499 // A constructor shall not be virtual (10.3) or static (9.4). A 1500 // constructor can be invoked for a const, volatile or const 1501 // volatile object. A constructor shall not be declared const, 1502 // volatile, or const volatile (9.3.2). 1503 if (isVirtual) { 1504 if (!D.isInvalidType()) 1505 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1506 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1507 << SourceRange(D.getIdentifierLoc()); 1508 D.setInvalidType(); 1509 } 1510 if (SC == FunctionDecl::Static) { 1511 if (!D.isInvalidType()) 1512 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1513 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1514 << SourceRange(D.getIdentifierLoc()); 1515 D.setInvalidType(); 1516 SC = FunctionDecl::None; 1517 } 1518 1519 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1520 if (FTI.TypeQuals != 0) { 1521 if (FTI.TypeQuals & QualType::Const) 1522 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1523 << "const" << SourceRange(D.getIdentifierLoc()); 1524 if (FTI.TypeQuals & QualType::Volatile) 1525 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1526 << "volatile" << SourceRange(D.getIdentifierLoc()); 1527 if (FTI.TypeQuals & QualType::Restrict) 1528 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1529 << "restrict" << SourceRange(D.getIdentifierLoc()); 1530 } 1531 1532 // Rebuild the function type "R" without any type qualifiers (in 1533 // case any of the errors above fired) and with "void" as the 1534 // return type, since constructors don't have return types. We 1535 // *always* have to do this, because GetTypeForDeclarator will 1536 // put in a result type of "int" when none was specified. 1537 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1538 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1539 Proto->getNumArgs(), 1540 Proto->isVariadic(), 0); 1541} 1542 1543/// CheckConstructor - Checks a fully-formed constructor for 1544/// well-formedness, issuing any diagnostics required. Returns true if 1545/// the constructor declarator is invalid. 1546void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1547 CXXRecordDecl *ClassDecl 1548 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1549 if (!ClassDecl) 1550 return Constructor->setInvalidDecl(); 1551 1552 // C++ [class.copy]p3: 1553 // A declaration of a constructor for a class X is ill-formed if 1554 // its first parameter is of type (optionally cv-qualified) X and 1555 // either there are no other parameters or else all other 1556 // parameters have default arguments. 1557 if (!Constructor->isInvalidDecl() && 1558 ((Constructor->getNumParams() == 1) || 1559 (Constructor->getNumParams() > 1 && 1560 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1561 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1562 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1563 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1564 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1565 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1566 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1567 Constructor->setInvalidDecl(); 1568 } 1569 } 1570 1571 // Notify the class that we've added a constructor. 1572 ClassDecl->addedConstructor(Context, Constructor); 1573} 1574 1575static inline bool 1576FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1577 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1578 FTI.ArgInfo[0].Param && 1579 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1580} 1581 1582/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1583/// the well-formednes of the destructor declarator @p D with type @p 1584/// R. If there are any errors in the declarator, this routine will 1585/// emit diagnostics and set the declarator to invalid. Even if this happens, 1586/// will be updated to reflect a well-formed type for the destructor and 1587/// returned. 1588QualType Sema::CheckDestructorDeclarator(Declarator &D, 1589 FunctionDecl::StorageClass& SC) { 1590 // C++ [class.dtor]p1: 1591 // [...] A typedef-name that names a class is a class-name 1592 // (7.1.3); however, a typedef-name that names a class shall not 1593 // be used as the identifier in the declarator for a destructor 1594 // declaration. 1595 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1596 if (isa<TypedefType>(DeclaratorType)) { 1597 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1598 << DeclaratorType; 1599 D.setInvalidType(); 1600 } 1601 1602 // C++ [class.dtor]p2: 1603 // A destructor is used to destroy objects of its class type. A 1604 // destructor takes no parameters, and no return type can be 1605 // specified for it (not even void). The address of a destructor 1606 // shall not be taken. A destructor shall not be static. A 1607 // destructor can be invoked for a const, volatile or const 1608 // volatile object. A destructor shall not be declared const, 1609 // volatile or const volatile (9.3.2). 1610 if (SC == FunctionDecl::Static) { 1611 if (!D.isInvalidType()) 1612 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1613 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1614 << SourceRange(D.getIdentifierLoc()); 1615 SC = FunctionDecl::None; 1616 D.setInvalidType(); 1617 } 1618 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1619 // Destructors don't have return types, but the parser will 1620 // happily parse something like: 1621 // 1622 // class X { 1623 // float ~X(); 1624 // }; 1625 // 1626 // The return type will be eliminated later. 1627 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1628 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1629 << SourceRange(D.getIdentifierLoc()); 1630 } 1631 1632 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1633 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1634 if (FTI.TypeQuals & QualType::Const) 1635 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1636 << "const" << SourceRange(D.getIdentifierLoc()); 1637 if (FTI.TypeQuals & QualType::Volatile) 1638 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1639 << "volatile" << SourceRange(D.getIdentifierLoc()); 1640 if (FTI.TypeQuals & QualType::Restrict) 1641 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1642 << "restrict" << SourceRange(D.getIdentifierLoc()); 1643 D.setInvalidType(); 1644 } 1645 1646 // Make sure we don't have any parameters. 1647 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1648 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1649 1650 // Delete the parameters. 1651 FTI.freeArgs(); 1652 D.setInvalidType(); 1653 } 1654 1655 // Make sure the destructor isn't variadic. 1656 if (FTI.isVariadic) { 1657 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1658 D.setInvalidType(); 1659 } 1660 1661 // Rebuild the function type "R" without any type qualifiers or 1662 // parameters (in case any of the errors above fired) and with 1663 // "void" as the return type, since destructors don't have return 1664 // types. We *always* have to do this, because GetTypeForDeclarator 1665 // will put in a result type of "int" when none was specified. 1666 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1667} 1668 1669/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1670/// well-formednes of the conversion function declarator @p D with 1671/// type @p R. If there are any errors in the declarator, this routine 1672/// will emit diagnostics and return true. Otherwise, it will return 1673/// false. Either way, the type @p R will be updated to reflect a 1674/// well-formed type for the conversion operator. 1675void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1676 FunctionDecl::StorageClass& SC) { 1677 // C++ [class.conv.fct]p1: 1678 // Neither parameter types nor return type can be specified. The 1679 // type of a conversion function (8.3.5) is “function taking no 1680 // parameter returning conversion-type-id.” 1681 if (SC == FunctionDecl::Static) { 1682 if (!D.isInvalidType()) 1683 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1684 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1685 << SourceRange(D.getIdentifierLoc()); 1686 D.setInvalidType(); 1687 SC = FunctionDecl::None; 1688 } 1689 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1690 // Conversion functions don't have return types, but the parser will 1691 // happily parse something like: 1692 // 1693 // class X { 1694 // float operator bool(); 1695 // }; 1696 // 1697 // The return type will be changed later anyway. 1698 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1699 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1700 << SourceRange(D.getIdentifierLoc()); 1701 } 1702 1703 // Make sure we don't have any parameters. 1704 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1705 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1706 1707 // Delete the parameters. 1708 D.getTypeObject(0).Fun.freeArgs(); 1709 D.setInvalidType(); 1710 } 1711 1712 // Make sure the conversion function isn't variadic. 1713 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1714 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1715 D.setInvalidType(); 1716 } 1717 1718 // C++ [class.conv.fct]p4: 1719 // The conversion-type-id shall not represent a function type nor 1720 // an array type. 1721 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1722 if (ConvType->isArrayType()) { 1723 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1724 ConvType = Context.getPointerType(ConvType); 1725 D.setInvalidType(); 1726 } else if (ConvType->isFunctionType()) { 1727 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1728 ConvType = Context.getPointerType(ConvType); 1729 D.setInvalidType(); 1730 } 1731 1732 // Rebuild the function type "R" without any parameters (in case any 1733 // of the errors above fired) and with the conversion type as the 1734 // return type. 1735 R = Context.getFunctionType(ConvType, 0, 0, false, 1736 R->getAsFunctionProtoType()->getTypeQuals()); 1737 1738 // C++0x explicit conversion operators. 1739 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1740 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1741 diag::warn_explicit_conversion_functions) 1742 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1743} 1744 1745/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1746/// the declaration of the given C++ conversion function. This routine 1747/// is responsible for recording the conversion function in the C++ 1748/// class, if possible. 1749Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1750 assert(Conversion && "Expected to receive a conversion function declaration"); 1751 1752 // Set the lexical context of this conversion function 1753 Conversion->setLexicalDeclContext(CurContext); 1754 1755 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1756 1757 // Make sure we aren't redeclaring the conversion function. 1758 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1759 1760 // C++ [class.conv.fct]p1: 1761 // [...] A conversion function is never used to convert a 1762 // (possibly cv-qualified) object to the (possibly cv-qualified) 1763 // same object type (or a reference to it), to a (possibly 1764 // cv-qualified) base class of that type (or a reference to it), 1765 // or to (possibly cv-qualified) void. 1766 // FIXME: Suppress this warning if the conversion function ends up being a 1767 // virtual function that overrides a virtual function in a base class. 1768 QualType ClassType 1769 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1770 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1771 ConvType = ConvTypeRef->getPointeeType(); 1772 if (ConvType->isRecordType()) { 1773 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1774 if (ConvType == ClassType) 1775 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1776 << ClassType; 1777 else if (IsDerivedFrom(ClassType, ConvType)) 1778 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1779 << ClassType << ConvType; 1780 } else if (ConvType->isVoidType()) { 1781 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1782 << ClassType << ConvType; 1783 } 1784 1785 if (Conversion->getPreviousDeclaration()) { 1786 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1787 for (OverloadedFunctionDecl::function_iterator 1788 Conv = Conversions->function_begin(), 1789 ConvEnd = Conversions->function_end(); 1790 Conv != ConvEnd; ++Conv) { 1791 if (*Conv 1792 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1793 *Conv = Conversion; 1794 return DeclPtrTy::make(Conversion); 1795 } 1796 } 1797 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1798 } else 1799 ClassDecl->addConversionFunction(Context, Conversion); 1800 1801 return DeclPtrTy::make(Conversion); 1802} 1803 1804//===----------------------------------------------------------------------===// 1805// Namespace Handling 1806//===----------------------------------------------------------------------===// 1807 1808/// ActOnStartNamespaceDef - This is called at the start of a namespace 1809/// definition. 1810Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1811 SourceLocation IdentLoc, 1812 IdentifierInfo *II, 1813 SourceLocation LBrace) { 1814 NamespaceDecl *Namespc = 1815 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1816 Namespc->setLBracLoc(LBrace); 1817 1818 Scope *DeclRegionScope = NamespcScope->getParent(); 1819 1820 if (II) { 1821 // C++ [namespace.def]p2: 1822 // The identifier in an original-namespace-definition shall not have been 1823 // previously defined in the declarative region in which the 1824 // original-namespace-definition appears. The identifier in an 1825 // original-namespace-definition is the name of the namespace. Subsequently 1826 // in that declarative region, it is treated as an original-namespace-name. 1827 1828 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1829 true); 1830 1831 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1832 // This is an extended namespace definition. 1833 // Attach this namespace decl to the chain of extended namespace 1834 // definitions. 1835 OrigNS->setNextNamespace(Namespc); 1836 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1837 1838 // Remove the previous declaration from the scope. 1839 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1840 IdResolver.RemoveDecl(OrigNS); 1841 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1842 } 1843 } else if (PrevDecl) { 1844 // This is an invalid name redefinition. 1845 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1846 << Namespc->getDeclName(); 1847 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1848 Namespc->setInvalidDecl(); 1849 // Continue on to push Namespc as current DeclContext and return it. 1850 } 1851 1852 PushOnScopeChains(Namespc, DeclRegionScope); 1853 } else { 1854 // FIXME: Handle anonymous namespaces 1855 } 1856 1857 // Although we could have an invalid decl (i.e. the namespace name is a 1858 // redefinition), push it as current DeclContext and try to continue parsing. 1859 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1860 // for the namespace has the declarations that showed up in that particular 1861 // namespace definition. 1862 PushDeclContext(NamespcScope, Namespc); 1863 return DeclPtrTy::make(Namespc); 1864} 1865 1866/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1867/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1868void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1869 Decl *Dcl = D.getAs<Decl>(); 1870 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1871 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1872 Namespc->setRBracLoc(RBrace); 1873 PopDeclContext(); 1874} 1875 1876Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1877 SourceLocation UsingLoc, 1878 SourceLocation NamespcLoc, 1879 const CXXScopeSpec &SS, 1880 SourceLocation IdentLoc, 1881 IdentifierInfo *NamespcName, 1882 AttributeList *AttrList) { 1883 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1884 assert(NamespcName && "Invalid NamespcName."); 1885 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1886 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1887 1888 UsingDirectiveDecl *UDir = 0; 1889 1890 // Lookup namespace name. 1891 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1892 LookupNamespaceName, false); 1893 if (R.isAmbiguous()) { 1894 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1895 return DeclPtrTy(); 1896 } 1897 if (NamedDecl *NS = R) { 1898 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1899 // C++ [namespace.udir]p1: 1900 // A using-directive specifies that the names in the nominated 1901 // namespace can be used in the scope in which the 1902 // using-directive appears after the using-directive. During 1903 // unqualified name lookup (3.4.1), the names appear as if they 1904 // were declared in the nearest enclosing namespace which 1905 // contains both the using-directive and the nominated 1906 // namespace. [Note: in this context, “contains” means “contains 1907 // directly or indirectly”. ] 1908 1909 // Find enclosing context containing both using-directive and 1910 // nominated namespace. 1911 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1912 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1913 CommonAncestor = CommonAncestor->getParent(); 1914 1915 UDir = UsingDirectiveDecl::Create(Context, 1916 CurContext, UsingLoc, 1917 NamespcLoc, 1918 SS.getRange(), 1919 (NestedNameSpecifier *)SS.getScopeRep(), 1920 IdentLoc, 1921 cast<NamespaceDecl>(NS), 1922 CommonAncestor); 1923 PushUsingDirective(S, UDir); 1924 } else { 1925 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1926 } 1927 1928 // FIXME: We ignore attributes for now. 1929 delete AttrList; 1930 return DeclPtrTy::make(UDir); 1931} 1932 1933void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1934 // If scope has associated entity, then using directive is at namespace 1935 // or translation unit scope. We add UsingDirectiveDecls, into 1936 // it's lookup structure. 1937 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1938 Ctx->addDecl(UDir); 1939 else 1940 // Otherwise it is block-sope. using-directives will affect lookup 1941 // only to the end of scope. 1942 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1943} 1944 1945 1946Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1947 SourceLocation UsingLoc, 1948 const CXXScopeSpec &SS, 1949 SourceLocation IdentLoc, 1950 IdentifierInfo *TargetName, 1951 OverloadedOperatorKind Op, 1952 AttributeList *AttrList, 1953 bool IsTypeName) { 1954 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1955 assert((TargetName || Op) && "Invalid TargetName."); 1956 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1957 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1958 1959 UsingDecl *UsingAlias = 0; 1960 1961 DeclarationName Name; 1962 if (TargetName) 1963 Name = TargetName; 1964 else 1965 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1966 1967 // Lookup target name. 1968 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1969 1970 if (NamedDecl *NS = R) { 1971 if (IsTypeName && !isa<TypeDecl>(NS)) { 1972 Diag(IdentLoc, diag::err_using_typename_non_type); 1973 } 1974 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1975 NS->getLocation(), UsingLoc, NS, 1976 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1977 IsTypeName); 1978 PushOnScopeChains(UsingAlias, S); 1979 } else { 1980 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1981 } 1982 1983 // FIXME: We ignore attributes for now. 1984 delete AttrList; 1985 return DeclPtrTy::make(UsingAlias); 1986} 1987 1988/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1989/// is a namespace alias, returns the namespace it points to. 1990static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1991 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1992 return AD->getNamespace(); 1993 return dyn_cast_or_null<NamespaceDecl>(D); 1994} 1995 1996Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1997 SourceLocation NamespaceLoc, 1998 SourceLocation AliasLoc, 1999 IdentifierInfo *Alias, 2000 const CXXScopeSpec &SS, 2001 SourceLocation IdentLoc, 2002 IdentifierInfo *Ident) { 2003 2004 // Lookup the namespace name. 2005 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2006 2007 // Check if we have a previous declaration with the same name. 2008 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2009 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2010 // We already have an alias with the same name that points to the same 2011 // namespace, so don't create a new one. 2012 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2013 return DeclPtrTy(); 2014 } 2015 2016 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2017 diag::err_redefinition_different_kind; 2018 Diag(AliasLoc, DiagID) << Alias; 2019 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2020 return DeclPtrTy(); 2021 } 2022 2023 if (R.isAmbiguous()) { 2024 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2025 return DeclPtrTy(); 2026 } 2027 2028 if (!R) { 2029 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2030 return DeclPtrTy(); 2031 } 2032 2033 NamespaceAliasDecl *AliasDecl = 2034 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2035 Alias, SS.getRange(), 2036 (NestedNameSpecifier *)SS.getScopeRep(), 2037 IdentLoc, R); 2038 2039 CurContext->addDecl(AliasDecl); 2040 return DeclPtrTy::make(AliasDecl); 2041} 2042 2043void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2044 CXXConstructorDecl *Constructor) { 2045 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2046 !Constructor->isUsed()) && 2047 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2048 2049 CXXRecordDecl *ClassDecl 2050 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2051 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2052 // Before the implicitly-declared default constructor for a class is 2053 // implicitly defined, all the implicitly-declared default constructors 2054 // for its base class and its non-static data members shall have been 2055 // implicitly defined. 2056 bool err = false; 2057 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2058 E = ClassDecl->bases_end(); Base != E; ++Base) { 2059 CXXRecordDecl *BaseClassDecl 2060 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2061 if (!BaseClassDecl->hasTrivialConstructor()) { 2062 if (CXXConstructorDecl *BaseCtor = 2063 BaseClassDecl->getDefaultConstructor(Context)) 2064 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2065 else { 2066 Diag(CurrentLocation, diag::err_defining_default_ctor) 2067 << Context.getTagDeclType(ClassDecl) << 1 2068 << Context.getTagDeclType(BaseClassDecl); 2069 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2070 << Context.getTagDeclType(BaseClassDecl); 2071 err = true; 2072 } 2073 } 2074 } 2075 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2076 E = ClassDecl->field_end(); Field != E; ++Field) { 2077 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2078 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2079 FieldType = Array->getElementType(); 2080 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2081 CXXRecordDecl *FieldClassDecl 2082 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2083 if (!FieldClassDecl->hasTrivialConstructor()) { 2084 if (CXXConstructorDecl *FieldCtor = 2085 FieldClassDecl->getDefaultConstructor(Context)) 2086 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2087 else { 2088 Diag(CurrentLocation, diag::err_defining_default_ctor) 2089 << Context.getTagDeclType(ClassDecl) << 0 << 2090 Context.getTagDeclType(FieldClassDecl); 2091 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2092 << Context.getTagDeclType(FieldClassDecl); 2093 err = true; 2094 } 2095 } 2096 } 2097 else if (FieldType->isReferenceType()) { 2098 Diag(CurrentLocation, diag::err_unintialized_member) 2099 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2100 Diag((*Field)->getLocation(), diag::note_declared_at); 2101 err = true; 2102 } 2103 else if (FieldType.isConstQualified()) { 2104 Diag(CurrentLocation, diag::err_unintialized_member) 2105 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2106 Diag((*Field)->getLocation(), diag::note_declared_at); 2107 err = true; 2108 } 2109 } 2110 if (!err) 2111 Constructor->setUsed(); 2112 else 2113 Constructor->setInvalidDecl(); 2114} 2115 2116void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2117 CXXDestructorDecl *Destructor) { 2118 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2119 "DefineImplicitDestructor - call it for implicit default dtor"); 2120 2121 CXXRecordDecl *ClassDecl 2122 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2123 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2124 // C++ [class.dtor] p5 2125 // Before the implicitly-declared default destructor for a class is 2126 // implicitly defined, all the implicitly-declared default destructors 2127 // for its base class and its non-static data members shall have been 2128 // implicitly defined. 2129 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2130 E = ClassDecl->bases_end(); Base != E; ++Base) { 2131 CXXRecordDecl *BaseClassDecl 2132 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2133 if (!BaseClassDecl->hasTrivialDestructor()) { 2134 if (CXXDestructorDecl *BaseDtor = 2135 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2136 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2137 else 2138 assert(false && 2139 "DefineImplicitDestructor - missing dtor in a base class"); 2140 } 2141 } 2142 2143 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2144 E = ClassDecl->field_end(); Field != E; ++Field) { 2145 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2146 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2147 FieldType = Array->getElementType(); 2148 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2149 CXXRecordDecl *FieldClassDecl 2150 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2151 if (!FieldClassDecl->hasTrivialDestructor()) { 2152 if (CXXDestructorDecl *FieldDtor = 2153 const_cast<CXXDestructorDecl*>( 2154 FieldClassDecl->getDestructor(Context))) 2155 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2156 else 2157 assert(false && 2158 "DefineImplicitDestructor - missing dtor in class of a data member"); 2159 } 2160 } 2161 } 2162 Destructor->setUsed(); 2163} 2164 2165void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2166 CXXMethodDecl *MethodDecl) { 2167 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2168 MethodDecl->getOverloadedOperator() == OO_Equal && 2169 !MethodDecl->isUsed()) && 2170 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2171 2172 CXXRecordDecl *ClassDecl 2173 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2174 2175 // C++[class.copy] p12 2176 // Before the implicitly-declared copy assignment operator for a class is 2177 // implicitly defined, all implicitly-declared copy assignment operators 2178 // for its direct base classes and its nonstatic data members shall have 2179 // been implicitly defined. 2180 bool err = false; 2181 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2182 E = ClassDecl->bases_end(); Base != E; ++Base) { 2183 CXXRecordDecl *BaseClassDecl 2184 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2185 if (CXXMethodDecl *BaseAssignOpMethod = 2186 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2187 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2188 } 2189 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2190 E = ClassDecl->field_end(); Field != E; ++Field) { 2191 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2192 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2193 FieldType = Array->getElementType(); 2194 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2195 CXXRecordDecl *FieldClassDecl 2196 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2197 if (CXXMethodDecl *FieldAssignOpMethod = 2198 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2199 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2200 } 2201 else if (FieldType->isReferenceType()) { 2202 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2203 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2204 Diag(Field->getLocation(), diag::note_declared_at); 2205 Diag(CurrentLocation, diag::note_first_required_here); 2206 err = true; 2207 } 2208 else if (FieldType.isConstQualified()) { 2209 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2210 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2211 Diag(Field->getLocation(), diag::note_declared_at); 2212 Diag(CurrentLocation, diag::note_first_required_here); 2213 err = true; 2214 } 2215 } 2216 if (!err) 2217 MethodDecl->setUsed(); 2218} 2219 2220CXXMethodDecl * 2221Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2222 CXXRecordDecl *ClassDecl) { 2223 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2224 QualType RHSType(LHSType); 2225 // If class's assignment operator argument is const/volatile qualified, 2226 // look for operator = (const/volatile B&). Otherwise, look for 2227 // operator = (B&). 2228 if (ParmDecl->getType().isConstQualified()) 2229 RHSType.addConst(); 2230 if (ParmDecl->getType().isVolatileQualified()) 2231 RHSType.addVolatile(); 2232 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2233 LHSType, 2234 SourceLocation())); 2235 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2236 RHSType, 2237 SourceLocation())); 2238 Expr *Args[2] = { &*LHS, &*RHS }; 2239 OverloadCandidateSet CandidateSet; 2240 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2241 CandidateSet); 2242 OverloadCandidateSet::iterator Best; 2243 if (BestViableFunction(CandidateSet, 2244 ClassDecl->getLocation(), Best) == OR_Success) 2245 return cast<CXXMethodDecl>(Best->Function); 2246 assert(false && 2247 "getAssignOperatorMethod - copy assignment operator method not found"); 2248 return 0; 2249} 2250 2251void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2252 CXXConstructorDecl *CopyConstructor, 2253 unsigned TypeQuals) { 2254 assert((CopyConstructor->isImplicit() && 2255 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2256 !CopyConstructor->isUsed()) && 2257 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2258 2259 CXXRecordDecl *ClassDecl 2260 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2261 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2262 // C++ [class.copy] p209 2263 // Before the implicitly-declared copy constructor for a class is 2264 // implicitly defined, all the implicitly-declared copy constructors 2265 // for its base class and its non-static data members shall have been 2266 // implicitly defined. 2267 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2268 Base != ClassDecl->bases_end(); ++Base) { 2269 CXXRecordDecl *BaseClassDecl 2270 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2271 if (CXXConstructorDecl *BaseCopyCtor = 2272 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2273 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2274 } 2275 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2276 FieldEnd = ClassDecl->field_end(); 2277 Field != FieldEnd; ++Field) { 2278 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2279 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2280 FieldType = Array->getElementType(); 2281 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2282 CXXRecordDecl *FieldClassDecl 2283 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2284 if (CXXConstructorDecl *FieldCopyCtor = 2285 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2286 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2287 } 2288 } 2289 CopyConstructor->setUsed(); 2290} 2291 2292void Sema::InitializeVarWithConstructor(VarDecl *VD, 2293 CXXConstructorDecl *Constructor, 2294 QualType DeclInitType, 2295 Expr **Exprs, unsigned NumExprs) { 2296 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2297 false, Exprs, NumExprs); 2298 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2299 VD->setInit(Context, Temp); 2300} 2301 2302void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2303{ 2304 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2305 DeclInitType->getAsRecordType()->getDecl()); 2306 if (!ClassDecl->hasTrivialDestructor()) 2307 if (CXXDestructorDecl *Destructor = 2308 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2309 MarkDeclarationReferenced(Loc, Destructor); 2310} 2311 2312/// AddCXXDirectInitializerToDecl - This action is called immediately after 2313/// ActOnDeclarator, when a C++ direct initializer is present. 2314/// e.g: "int x(1);" 2315void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2316 SourceLocation LParenLoc, 2317 MultiExprArg Exprs, 2318 SourceLocation *CommaLocs, 2319 SourceLocation RParenLoc) { 2320 unsigned NumExprs = Exprs.size(); 2321 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2322 Decl *RealDecl = Dcl.getAs<Decl>(); 2323 2324 // If there is no declaration, there was an error parsing it. Just ignore 2325 // the initializer. 2326 if (RealDecl == 0) 2327 return; 2328 2329 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2330 if (!VDecl) { 2331 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2332 RealDecl->setInvalidDecl(); 2333 return; 2334 } 2335 2336 // FIXME: Need to handle dependent types and expressions here. 2337 2338 // We will treat direct-initialization as a copy-initialization: 2339 // int x(1); -as-> int x = 1; 2340 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2341 // 2342 // Clients that want to distinguish between the two forms, can check for 2343 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2344 // A major benefit is that clients that don't particularly care about which 2345 // exactly form was it (like the CodeGen) can handle both cases without 2346 // special case code. 2347 2348 // C++ 8.5p11: 2349 // The form of initialization (using parentheses or '=') is generally 2350 // insignificant, but does matter when the entity being initialized has a 2351 // class type. 2352 QualType DeclInitType = VDecl->getType(); 2353 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2354 DeclInitType = Array->getElementType(); 2355 2356 // FIXME: This isn't the right place to complete the type. 2357 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2358 diag::err_typecheck_decl_incomplete_type)) { 2359 VDecl->setInvalidDecl(); 2360 return; 2361 } 2362 2363 if (VDecl->getType()->isRecordType()) { 2364 CXXConstructorDecl *Constructor 2365 = PerformInitializationByConstructor(DeclInitType, 2366 (Expr **)Exprs.get(), NumExprs, 2367 VDecl->getLocation(), 2368 SourceRange(VDecl->getLocation(), 2369 RParenLoc), 2370 VDecl->getDeclName(), 2371 IK_Direct); 2372 if (!Constructor) 2373 RealDecl->setInvalidDecl(); 2374 else { 2375 VDecl->setCXXDirectInitializer(true); 2376 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2377 (Expr**)Exprs.release(), NumExprs); 2378 // FIXME. Must do all that is needed to destroy the object 2379 // on scope exit. For now, just mark the destructor as used. 2380 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2381 } 2382 return; 2383 } 2384 2385 if (NumExprs > 1) { 2386 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2387 << SourceRange(VDecl->getLocation(), RParenLoc); 2388 RealDecl->setInvalidDecl(); 2389 return; 2390 } 2391 2392 // Let clients know that initialization was done with a direct initializer. 2393 VDecl->setCXXDirectInitializer(true); 2394 2395 assert(NumExprs == 1 && "Expected 1 expression"); 2396 // Set the init expression, handles conversions. 2397 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2398 /*DirectInit=*/true); 2399} 2400 2401/// PerformInitializationByConstructor - Perform initialization by 2402/// constructor (C++ [dcl.init]p14), which may occur as part of 2403/// direct-initialization or copy-initialization. We are initializing 2404/// an object of type @p ClassType with the given arguments @p 2405/// Args. @p Loc is the location in the source code where the 2406/// initializer occurs (e.g., a declaration, member initializer, 2407/// functional cast, etc.) while @p Range covers the whole 2408/// initialization. @p InitEntity is the entity being initialized, 2409/// which may by the name of a declaration or a type. @p Kind is the 2410/// kind of initialization we're performing, which affects whether 2411/// explicit constructors will be considered. When successful, returns 2412/// the constructor that will be used to perform the initialization; 2413/// when the initialization fails, emits a diagnostic and returns 2414/// null. 2415CXXConstructorDecl * 2416Sema::PerformInitializationByConstructor(QualType ClassType, 2417 Expr **Args, unsigned NumArgs, 2418 SourceLocation Loc, SourceRange Range, 2419 DeclarationName InitEntity, 2420 InitializationKind Kind) { 2421 const RecordType *ClassRec = ClassType->getAsRecordType(); 2422 assert(ClassRec && "Can only initialize a class type here"); 2423 2424 // C++ [dcl.init]p14: 2425 // 2426 // If the initialization is direct-initialization, or if it is 2427 // copy-initialization where the cv-unqualified version of the 2428 // source type is the same class as, or a derived class of, the 2429 // class of the destination, constructors are considered. The 2430 // applicable constructors are enumerated (13.3.1.3), and the 2431 // best one is chosen through overload resolution (13.3). The 2432 // constructor so selected is called to initialize the object, 2433 // with the initializer expression(s) as its argument(s). If no 2434 // constructor applies, or the overload resolution is ambiguous, 2435 // the initialization is ill-formed. 2436 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2437 OverloadCandidateSet CandidateSet; 2438 2439 // Add constructors to the overload set. 2440 DeclarationName ConstructorName 2441 = Context.DeclarationNames.getCXXConstructorName( 2442 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2443 DeclContext::lookup_const_iterator Con, ConEnd; 2444 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2445 Con != ConEnd; ++Con) { 2446 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2447 if ((Kind == IK_Direct) || 2448 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2449 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2450 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2451 } 2452 2453 // FIXME: When we decide not to synthesize the implicitly-declared 2454 // constructors, we'll need to make them appear here. 2455 2456 OverloadCandidateSet::iterator Best; 2457 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2458 case OR_Success: 2459 // We found a constructor. Return it. 2460 return cast<CXXConstructorDecl>(Best->Function); 2461 2462 case OR_No_Viable_Function: 2463 if (InitEntity) 2464 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2465 << InitEntity << Range; 2466 else 2467 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2468 << ClassType << Range; 2469 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2470 return 0; 2471 2472 case OR_Ambiguous: 2473 if (InitEntity) 2474 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2475 else 2476 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2477 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2478 return 0; 2479 2480 case OR_Deleted: 2481 if (InitEntity) 2482 Diag(Loc, diag::err_ovl_deleted_init) 2483 << Best->Function->isDeleted() 2484 << InitEntity << Range; 2485 else 2486 Diag(Loc, diag::err_ovl_deleted_init) 2487 << Best->Function->isDeleted() 2488 << InitEntity << Range; 2489 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2490 return 0; 2491 } 2492 2493 return 0; 2494} 2495 2496/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2497/// determine whether they are reference-related, 2498/// reference-compatible, reference-compatible with added 2499/// qualification, or incompatible, for use in C++ initialization by 2500/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2501/// type, and the first type (T1) is the pointee type of the reference 2502/// type being initialized. 2503Sema::ReferenceCompareResult 2504Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2505 bool& DerivedToBase) { 2506 assert(!T1->isReferenceType() && 2507 "T1 must be the pointee type of the reference type"); 2508 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2509 2510 T1 = Context.getCanonicalType(T1); 2511 T2 = Context.getCanonicalType(T2); 2512 QualType UnqualT1 = T1.getUnqualifiedType(); 2513 QualType UnqualT2 = T2.getUnqualifiedType(); 2514 2515 // C++ [dcl.init.ref]p4: 2516 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2517 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2518 // T1 is a base class of T2. 2519 if (UnqualT1 == UnqualT2) 2520 DerivedToBase = false; 2521 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2522 DerivedToBase = true; 2523 else 2524 return Ref_Incompatible; 2525 2526 // At this point, we know that T1 and T2 are reference-related (at 2527 // least). 2528 2529 // C++ [dcl.init.ref]p4: 2530 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2531 // reference-related to T2 and cv1 is the same cv-qualification 2532 // as, or greater cv-qualification than, cv2. For purposes of 2533 // overload resolution, cases for which cv1 is greater 2534 // cv-qualification than cv2 are identified as 2535 // reference-compatible with added qualification (see 13.3.3.2). 2536 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2537 return Ref_Compatible; 2538 else if (T1.isMoreQualifiedThan(T2)) 2539 return Ref_Compatible_With_Added_Qualification; 2540 else 2541 return Ref_Related; 2542} 2543 2544/// CheckReferenceInit - Check the initialization of a reference 2545/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2546/// the initializer (either a simple initializer or an initializer 2547/// list), and DeclType is the type of the declaration. When ICS is 2548/// non-null, this routine will compute the implicit conversion 2549/// sequence according to C++ [over.ics.ref] and will not produce any 2550/// diagnostics; when ICS is null, it will emit diagnostics when any 2551/// errors are found. Either way, a return value of true indicates 2552/// that there was a failure, a return value of false indicates that 2553/// the reference initialization succeeded. 2554/// 2555/// When @p SuppressUserConversions, user-defined conversions are 2556/// suppressed. 2557/// When @p AllowExplicit, we also permit explicit user-defined 2558/// conversion functions. 2559/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2560bool 2561Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2562 ImplicitConversionSequence *ICS, 2563 bool SuppressUserConversions, 2564 bool AllowExplicit, bool ForceRValue) { 2565 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2566 2567 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2568 QualType T2 = Init->getType(); 2569 2570 // If the initializer is the address of an overloaded function, try 2571 // to resolve the overloaded function. If all goes well, T2 is the 2572 // type of the resulting function. 2573 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2574 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2575 ICS != 0); 2576 if (Fn) { 2577 // Since we're performing this reference-initialization for 2578 // real, update the initializer with the resulting function. 2579 if (!ICS) { 2580 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2581 return true; 2582 2583 FixOverloadedFunctionReference(Init, Fn); 2584 } 2585 2586 T2 = Fn->getType(); 2587 } 2588 } 2589 2590 // Compute some basic properties of the types and the initializer. 2591 bool isRValRef = DeclType->isRValueReferenceType(); 2592 bool DerivedToBase = false; 2593 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2594 Init->isLvalue(Context); 2595 ReferenceCompareResult RefRelationship 2596 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2597 2598 // Most paths end in a failed conversion. 2599 if (ICS) 2600 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2601 2602 // C++ [dcl.init.ref]p5: 2603 // A reference to type “cv1 T1” is initialized by an expression 2604 // of type “cv2 T2” as follows: 2605 2606 // -- If the initializer expression 2607 2608 // Rvalue references cannot bind to lvalues (N2812). 2609 // There is absolutely no situation where they can. In particular, note that 2610 // this is ill-formed, even if B has a user-defined conversion to A&&: 2611 // B b; 2612 // A&& r = b; 2613 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2614 if (!ICS) 2615 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2616 << Init->getSourceRange(); 2617 return true; 2618 } 2619 2620 bool BindsDirectly = false; 2621 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2622 // reference-compatible with “cv2 T2,” or 2623 // 2624 // Note that the bit-field check is skipped if we are just computing 2625 // the implicit conversion sequence (C++ [over.best.ics]p2). 2626 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2627 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2628 BindsDirectly = true; 2629 2630 if (ICS) { 2631 // C++ [over.ics.ref]p1: 2632 // When a parameter of reference type binds directly (8.5.3) 2633 // to an argument expression, the implicit conversion sequence 2634 // is the identity conversion, unless the argument expression 2635 // has a type that is a derived class of the parameter type, 2636 // in which case the implicit conversion sequence is a 2637 // derived-to-base Conversion (13.3.3.1). 2638 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2639 ICS->Standard.First = ICK_Identity; 2640 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2641 ICS->Standard.Third = ICK_Identity; 2642 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2643 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2644 ICS->Standard.ReferenceBinding = true; 2645 ICS->Standard.DirectBinding = true; 2646 ICS->Standard.RRefBinding = false; 2647 ICS->Standard.CopyConstructor = 0; 2648 2649 // Nothing more to do: the inaccessibility/ambiguity check for 2650 // derived-to-base conversions is suppressed when we're 2651 // computing the implicit conversion sequence (C++ 2652 // [over.best.ics]p2). 2653 return false; 2654 } else { 2655 // Perform the conversion. 2656 // FIXME: Binding to a subobject of the lvalue is going to require more 2657 // AST annotation than this. 2658 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2659 } 2660 } 2661 2662 // -- has a class type (i.e., T2 is a class type) and can be 2663 // implicitly converted to an lvalue of type “cv3 T3,” 2664 // where “cv1 T1” is reference-compatible with “cv3 T3” 2665 // 92) (this conversion is selected by enumerating the 2666 // applicable conversion functions (13.3.1.6) and choosing 2667 // the best one through overload resolution (13.3)), 2668 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2669 // FIXME: Look for conversions in base classes! 2670 CXXRecordDecl *T2RecordDecl 2671 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2672 2673 OverloadCandidateSet CandidateSet; 2674 OverloadedFunctionDecl *Conversions 2675 = T2RecordDecl->getConversionFunctions(); 2676 for (OverloadedFunctionDecl::function_iterator Func 2677 = Conversions->function_begin(); 2678 Func != Conversions->function_end(); ++Func) { 2679 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2680 2681 // If the conversion function doesn't return a reference type, 2682 // it can't be considered for this conversion. 2683 if (Conv->getConversionType()->isLValueReferenceType() && 2684 (AllowExplicit || !Conv->isExplicit())) 2685 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2686 } 2687 2688 OverloadCandidateSet::iterator Best; 2689 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2690 case OR_Success: 2691 // This is a direct binding. 2692 BindsDirectly = true; 2693 2694 if (ICS) { 2695 // C++ [over.ics.ref]p1: 2696 // 2697 // [...] If the parameter binds directly to the result of 2698 // applying a conversion function to the argument 2699 // expression, the implicit conversion sequence is a 2700 // user-defined conversion sequence (13.3.3.1.2), with the 2701 // second standard conversion sequence either an identity 2702 // conversion or, if the conversion function returns an 2703 // entity of a type that is a derived class of the parameter 2704 // type, a derived-to-base Conversion. 2705 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2706 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2707 ICS->UserDefined.After = Best->FinalConversion; 2708 ICS->UserDefined.ConversionFunction = Best->Function; 2709 assert(ICS->UserDefined.After.ReferenceBinding && 2710 ICS->UserDefined.After.DirectBinding && 2711 "Expected a direct reference binding!"); 2712 return false; 2713 } else { 2714 // Perform the conversion. 2715 // FIXME: Binding to a subobject of the lvalue is going to require more 2716 // AST annotation than this. 2717 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2718 } 2719 break; 2720 2721 case OR_Ambiguous: 2722 assert(false && "Ambiguous reference binding conversions not implemented."); 2723 return true; 2724 2725 case OR_No_Viable_Function: 2726 case OR_Deleted: 2727 // There was no suitable conversion, or we found a deleted 2728 // conversion; continue with other checks. 2729 break; 2730 } 2731 } 2732 2733 if (BindsDirectly) { 2734 // C++ [dcl.init.ref]p4: 2735 // [...] In all cases where the reference-related or 2736 // reference-compatible relationship of two types is used to 2737 // establish the validity of a reference binding, and T1 is a 2738 // base class of T2, a program that necessitates such a binding 2739 // is ill-formed if T1 is an inaccessible (clause 11) or 2740 // ambiguous (10.2) base class of T2. 2741 // 2742 // Note that we only check this condition when we're allowed to 2743 // complain about errors, because we should not be checking for 2744 // ambiguity (or inaccessibility) unless the reference binding 2745 // actually happens. 2746 if (DerivedToBase) 2747 return CheckDerivedToBaseConversion(T2, T1, 2748 Init->getSourceRange().getBegin(), 2749 Init->getSourceRange()); 2750 else 2751 return false; 2752 } 2753 2754 // -- Otherwise, the reference shall be to a non-volatile const 2755 // type (i.e., cv1 shall be const), or the reference shall be an 2756 // rvalue reference and the initializer expression shall be an rvalue. 2757 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2758 if (!ICS) 2759 Diag(Init->getSourceRange().getBegin(), 2760 diag::err_not_reference_to_const_init) 2761 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2762 << T2 << Init->getSourceRange(); 2763 return true; 2764 } 2765 2766 // -- If the initializer expression is an rvalue, with T2 a 2767 // class type, and “cv1 T1” is reference-compatible with 2768 // “cv2 T2,” the reference is bound in one of the 2769 // following ways (the choice is implementation-defined): 2770 // 2771 // -- The reference is bound to the object represented by 2772 // the rvalue (see 3.10) or to a sub-object within that 2773 // object. 2774 // 2775 // -- A temporary of type “cv1 T2” [sic] is created, and 2776 // a constructor is called to copy the entire rvalue 2777 // object into the temporary. The reference is bound to 2778 // the temporary or to a sub-object within the 2779 // temporary. 2780 // 2781 // The constructor that would be used to make the copy 2782 // shall be callable whether or not the copy is actually 2783 // done. 2784 // 2785 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2786 // freedom, so we will always take the first option and never build 2787 // a temporary in this case. FIXME: We will, however, have to check 2788 // for the presence of a copy constructor in C++98/03 mode. 2789 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2790 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2791 if (ICS) { 2792 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2793 ICS->Standard.First = ICK_Identity; 2794 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2795 ICS->Standard.Third = ICK_Identity; 2796 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2797 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2798 ICS->Standard.ReferenceBinding = true; 2799 ICS->Standard.DirectBinding = false; 2800 ICS->Standard.RRefBinding = isRValRef; 2801 ICS->Standard.CopyConstructor = 0; 2802 } else { 2803 // FIXME: Binding to a subobject of the rvalue is going to require more 2804 // AST annotation than this. 2805 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2806 } 2807 return false; 2808 } 2809 2810 // -- Otherwise, a temporary of type “cv1 T1” is created and 2811 // initialized from the initializer expression using the 2812 // rules for a non-reference copy initialization (8.5). The 2813 // reference is then bound to the temporary. If T1 is 2814 // reference-related to T2, cv1 must be the same 2815 // cv-qualification as, or greater cv-qualification than, 2816 // cv2; otherwise, the program is ill-formed. 2817 if (RefRelationship == Ref_Related) { 2818 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2819 // we would be reference-compatible or reference-compatible with 2820 // added qualification. But that wasn't the case, so the reference 2821 // initialization fails. 2822 if (!ICS) 2823 Diag(Init->getSourceRange().getBegin(), 2824 diag::err_reference_init_drops_quals) 2825 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2826 << T2 << Init->getSourceRange(); 2827 return true; 2828 } 2829 2830 // If at least one of the types is a class type, the types are not 2831 // related, and we aren't allowed any user conversions, the 2832 // reference binding fails. This case is important for breaking 2833 // recursion, since TryImplicitConversion below will attempt to 2834 // create a temporary through the use of a copy constructor. 2835 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2836 (T1->isRecordType() || T2->isRecordType())) { 2837 if (!ICS) 2838 Diag(Init->getSourceRange().getBegin(), 2839 diag::err_typecheck_convert_incompatible) 2840 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2841 return true; 2842 } 2843 2844 // Actually try to convert the initializer to T1. 2845 if (ICS) { 2846 // C++ [over.ics.ref]p2: 2847 // 2848 // When a parameter of reference type is not bound directly to 2849 // an argument expression, the conversion sequence is the one 2850 // required to convert the argument expression to the 2851 // underlying type of the reference according to 2852 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2853 // to copy-initializing a temporary of the underlying type with 2854 // the argument expression. Any difference in top-level 2855 // cv-qualification is subsumed by the initialization itself 2856 // and does not constitute a conversion. 2857 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2858 // Of course, that's still a reference binding. 2859 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2860 ICS->Standard.ReferenceBinding = true; 2861 ICS->Standard.RRefBinding = isRValRef; 2862 } else if(ICS->ConversionKind == 2863 ImplicitConversionSequence::UserDefinedConversion) { 2864 ICS->UserDefined.After.ReferenceBinding = true; 2865 ICS->UserDefined.After.RRefBinding = isRValRef; 2866 } 2867 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2868 } else { 2869 return PerformImplicitConversion(Init, T1, "initializing"); 2870 } 2871} 2872 2873/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2874/// of this overloaded operator is well-formed. If so, returns false; 2875/// otherwise, emits appropriate diagnostics and returns true. 2876bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2877 assert(FnDecl && FnDecl->isOverloadedOperator() && 2878 "Expected an overloaded operator declaration"); 2879 2880 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2881 2882 // C++ [over.oper]p5: 2883 // The allocation and deallocation functions, operator new, 2884 // operator new[], operator delete and operator delete[], are 2885 // described completely in 3.7.3. The attributes and restrictions 2886 // found in the rest of this subclause do not apply to them unless 2887 // explicitly stated in 3.7.3. 2888 // FIXME: Write a separate routine for checking this. For now, just allow it. 2889 if (Op == OO_New || Op == OO_Array_New || 2890 Op == OO_Delete || Op == OO_Array_Delete) 2891 return false; 2892 2893 // C++ [over.oper]p6: 2894 // An operator function shall either be a non-static member 2895 // function or be a non-member function and have at least one 2896 // parameter whose type is a class, a reference to a class, an 2897 // enumeration, or a reference to an enumeration. 2898 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2899 if (MethodDecl->isStatic()) 2900 return Diag(FnDecl->getLocation(), 2901 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2902 } else { 2903 bool ClassOrEnumParam = false; 2904 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2905 ParamEnd = FnDecl->param_end(); 2906 Param != ParamEnd; ++Param) { 2907 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2908 if (ParamType->isDependentType() || ParamType->isRecordType() || 2909 ParamType->isEnumeralType()) { 2910 ClassOrEnumParam = true; 2911 break; 2912 } 2913 } 2914 2915 if (!ClassOrEnumParam) 2916 return Diag(FnDecl->getLocation(), 2917 diag::err_operator_overload_needs_class_or_enum) 2918 << FnDecl->getDeclName(); 2919 } 2920 2921 // C++ [over.oper]p8: 2922 // An operator function cannot have default arguments (8.3.6), 2923 // except where explicitly stated below. 2924 // 2925 // Only the function-call operator allows default arguments 2926 // (C++ [over.call]p1). 2927 if (Op != OO_Call) { 2928 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2929 Param != FnDecl->param_end(); ++Param) { 2930 if ((*Param)->hasUnparsedDefaultArg()) 2931 return Diag((*Param)->getLocation(), 2932 diag::err_operator_overload_default_arg) 2933 << FnDecl->getDeclName(); 2934 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2935 return Diag((*Param)->getLocation(), 2936 diag::err_operator_overload_default_arg) 2937 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2938 } 2939 } 2940 2941 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2942 { false, false, false } 2943#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2944 , { Unary, Binary, MemberOnly } 2945#include "clang/Basic/OperatorKinds.def" 2946 }; 2947 2948 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2949 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2950 bool MustBeMemberOperator = OperatorUses[Op][2]; 2951 2952 // C++ [over.oper]p8: 2953 // [...] Operator functions cannot have more or fewer parameters 2954 // than the number required for the corresponding operator, as 2955 // described in the rest of this subclause. 2956 unsigned NumParams = FnDecl->getNumParams() 2957 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2958 if (Op != OO_Call && 2959 ((NumParams == 1 && !CanBeUnaryOperator) || 2960 (NumParams == 2 && !CanBeBinaryOperator) || 2961 (NumParams < 1) || (NumParams > 2))) { 2962 // We have the wrong number of parameters. 2963 unsigned ErrorKind; 2964 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2965 ErrorKind = 2; // 2 -> unary or binary. 2966 } else if (CanBeUnaryOperator) { 2967 ErrorKind = 0; // 0 -> unary 2968 } else { 2969 assert(CanBeBinaryOperator && 2970 "All non-call overloaded operators are unary or binary!"); 2971 ErrorKind = 1; // 1 -> binary 2972 } 2973 2974 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2975 << FnDecl->getDeclName() << NumParams << ErrorKind; 2976 } 2977 2978 // Overloaded operators other than operator() cannot be variadic. 2979 if (Op != OO_Call && 2980 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2981 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2982 << FnDecl->getDeclName(); 2983 } 2984 2985 // Some operators must be non-static member functions. 2986 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2987 return Diag(FnDecl->getLocation(), 2988 diag::err_operator_overload_must_be_member) 2989 << FnDecl->getDeclName(); 2990 } 2991 2992 // C++ [over.inc]p1: 2993 // The user-defined function called operator++ implements the 2994 // prefix and postfix ++ operator. If this function is a member 2995 // function with no parameters, or a non-member function with one 2996 // parameter of class or enumeration type, it defines the prefix 2997 // increment operator ++ for objects of that type. If the function 2998 // is a member function with one parameter (which shall be of type 2999 // int) or a non-member function with two parameters (the second 3000 // of which shall be of type int), it defines the postfix 3001 // increment operator ++ for objects of that type. 3002 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3003 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3004 bool ParamIsInt = false; 3005 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3006 ParamIsInt = BT->getKind() == BuiltinType::Int; 3007 3008 if (!ParamIsInt) 3009 return Diag(LastParam->getLocation(), 3010 diag::err_operator_overload_post_incdec_must_be_int) 3011 << LastParam->getType() << (Op == OO_MinusMinus); 3012 } 3013 3014 // Notify the class if it got an assignment operator. 3015 if (Op == OO_Equal) { 3016 // Would have returned earlier otherwise. 3017 assert(isa<CXXMethodDecl>(FnDecl) && 3018 "Overloaded = not member, but not filtered."); 3019 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3020 Method->getParent()->addedAssignmentOperator(Context, Method); 3021 } 3022 3023 return false; 3024} 3025 3026/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3027/// linkage specification, including the language and (if present) 3028/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3029/// the location of the language string literal, which is provided 3030/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3031/// the '{' brace. Otherwise, this linkage specification does not 3032/// have any braces. 3033Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3034 SourceLocation ExternLoc, 3035 SourceLocation LangLoc, 3036 const char *Lang, 3037 unsigned StrSize, 3038 SourceLocation LBraceLoc) { 3039 LinkageSpecDecl::LanguageIDs Language; 3040 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3041 Language = LinkageSpecDecl::lang_c; 3042 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3043 Language = LinkageSpecDecl::lang_cxx; 3044 else { 3045 Diag(LangLoc, diag::err_bad_language); 3046 return DeclPtrTy(); 3047 } 3048 3049 // FIXME: Add all the various semantics of linkage specifications 3050 3051 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3052 LangLoc, Language, 3053 LBraceLoc.isValid()); 3054 CurContext->addDecl(D); 3055 PushDeclContext(S, D); 3056 return DeclPtrTy::make(D); 3057} 3058 3059/// ActOnFinishLinkageSpecification - Completely the definition of 3060/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3061/// valid, it's the position of the closing '}' brace in a linkage 3062/// specification that uses braces. 3063Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3064 DeclPtrTy LinkageSpec, 3065 SourceLocation RBraceLoc) { 3066 if (LinkageSpec) 3067 PopDeclContext(); 3068 return LinkageSpec; 3069} 3070 3071/// \brief Perform semantic analysis for the variable declaration that 3072/// occurs within a C++ catch clause, returning the newly-created 3073/// variable. 3074VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3075 IdentifierInfo *Name, 3076 SourceLocation Loc, 3077 SourceRange Range) { 3078 bool Invalid = false; 3079 3080 // Arrays and functions decay. 3081 if (ExDeclType->isArrayType()) 3082 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3083 else if (ExDeclType->isFunctionType()) 3084 ExDeclType = Context.getPointerType(ExDeclType); 3085 3086 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3087 // The exception-declaration shall not denote a pointer or reference to an 3088 // incomplete type, other than [cv] void*. 3089 // N2844 forbids rvalue references. 3090 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3091 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3092 Invalid = true; 3093 } 3094 3095 QualType BaseType = ExDeclType; 3096 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3097 unsigned DK = diag::err_catch_incomplete; 3098 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3099 BaseType = Ptr->getPointeeType(); 3100 Mode = 1; 3101 DK = diag::err_catch_incomplete_ptr; 3102 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3103 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3104 BaseType = Ref->getPointeeType(); 3105 Mode = 2; 3106 DK = diag::err_catch_incomplete_ref; 3107 } 3108 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3109 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3110 Invalid = true; 3111 3112 if (!Invalid && !ExDeclType->isDependentType() && 3113 RequireNonAbstractType(Loc, ExDeclType, 3114 diag::err_abstract_type_in_decl, 3115 AbstractVariableType)) 3116 Invalid = true; 3117 3118 // FIXME: Need to test for ability to copy-construct and destroy the 3119 // exception variable. 3120 3121 // FIXME: Need to check for abstract classes. 3122 3123 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3124 Name, ExDeclType, VarDecl::None, 3125 Range.getBegin()); 3126 3127 if (Invalid) 3128 ExDecl->setInvalidDecl(); 3129 3130 return ExDecl; 3131} 3132 3133/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3134/// handler. 3135Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3136 QualType ExDeclType = GetTypeForDeclarator(D, S); 3137 3138 bool Invalid = D.isInvalidType(); 3139 IdentifierInfo *II = D.getIdentifier(); 3140 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3141 // The scope should be freshly made just for us. There is just no way 3142 // it contains any previous declaration. 3143 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3144 if (PrevDecl->isTemplateParameter()) { 3145 // Maybe we will complain about the shadowed template parameter. 3146 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3147 } 3148 } 3149 3150 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3151 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3152 << D.getCXXScopeSpec().getRange(); 3153 Invalid = true; 3154 } 3155 3156 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3157 D.getIdentifier(), 3158 D.getIdentifierLoc(), 3159 D.getDeclSpec().getSourceRange()); 3160 3161 if (Invalid) 3162 ExDecl->setInvalidDecl(); 3163 3164 // Add the exception declaration into this scope. 3165 if (II) 3166 PushOnScopeChains(ExDecl, S); 3167 else 3168 CurContext->addDecl(ExDecl); 3169 3170 ProcessDeclAttributes(S, ExDecl, D); 3171 return DeclPtrTy::make(ExDecl); 3172} 3173 3174Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3175 ExprArg assertexpr, 3176 ExprArg assertmessageexpr) { 3177 Expr *AssertExpr = (Expr *)assertexpr.get(); 3178 StringLiteral *AssertMessage = 3179 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3180 3181 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3182 llvm::APSInt Value(32); 3183 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3184 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3185 AssertExpr->getSourceRange(); 3186 return DeclPtrTy(); 3187 } 3188 3189 if (Value == 0) { 3190 std::string str(AssertMessage->getStrData(), 3191 AssertMessage->getByteLength()); 3192 Diag(AssertLoc, diag::err_static_assert_failed) 3193 << str << AssertExpr->getSourceRange(); 3194 } 3195 } 3196 3197 assertexpr.release(); 3198 assertmessageexpr.release(); 3199 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3200 AssertExpr, AssertMessage); 3201 3202 CurContext->addDecl(Decl); 3203 return DeclPtrTy::make(Decl); 3204} 3205 3206bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3207 if (!(S->getFlags() & Scope::ClassScope)) { 3208 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3209 return true; 3210 } 3211 3212 return false; 3213} 3214 3215void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3216 Decl *Dcl = dcl.getAs<Decl>(); 3217 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3218 if (!Fn) { 3219 Diag(DelLoc, diag::err_deleted_non_function); 3220 return; 3221 } 3222 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3223 Diag(DelLoc, diag::err_deleted_decl_not_first); 3224 Diag(Prev->getLocation(), diag::note_previous_declaration); 3225 // If the declaration wasn't the first, we delete the function anyway for 3226 // recovery. 3227 } 3228 Fn->setDeleted(); 3229} 3230 3231static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3232 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3233 ++CI) { 3234 Stmt *SubStmt = *CI; 3235 if (!SubStmt) 3236 continue; 3237 if (isa<ReturnStmt>(SubStmt)) 3238 Self.Diag(SubStmt->getSourceRange().getBegin(), 3239 diag::err_return_in_constructor_handler); 3240 if (!isa<Expr>(SubStmt)) 3241 SearchForReturnInStmt(Self, SubStmt); 3242 } 3243} 3244 3245void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3246 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3247 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3248 SearchForReturnInStmt(*this, Handler); 3249 } 3250} 3251 3252bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3253 const CXXMethodDecl *Old) { 3254 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3255 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3256 3257 QualType CNewTy = Context.getCanonicalType(NewTy); 3258 QualType COldTy = Context.getCanonicalType(OldTy); 3259 3260 if (CNewTy == COldTy && 3261 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3262 return false; 3263 3264 // Check if the return types are covariant 3265 QualType NewClassTy, OldClassTy; 3266 3267 /// Both types must be pointers or references to classes. 3268 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3269 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3270 NewClassTy = NewPT->getPointeeType(); 3271 OldClassTy = OldPT->getPointeeType(); 3272 } 3273 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3274 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3275 NewClassTy = NewRT->getPointeeType(); 3276 OldClassTy = OldRT->getPointeeType(); 3277 } 3278 } 3279 3280 // The return types aren't either both pointers or references to a class type. 3281 if (NewClassTy.isNull()) { 3282 Diag(New->getLocation(), 3283 diag::err_different_return_type_for_overriding_virtual_function) 3284 << New->getDeclName() << NewTy << OldTy; 3285 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3286 3287 return true; 3288 } 3289 3290 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3291 // Check if the new class derives from the old class. 3292 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3293 Diag(New->getLocation(), 3294 diag::err_covariant_return_not_derived) 3295 << New->getDeclName() << NewTy << OldTy; 3296 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3297 return true; 3298 } 3299 3300 // Check if we the conversion from derived to base is valid. 3301 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3302 diag::err_covariant_return_inaccessible_base, 3303 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3304 // FIXME: Should this point to the return type? 3305 New->getLocation(), SourceRange(), New->getDeclName())) { 3306 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3307 return true; 3308 } 3309 } 3310 3311 // The qualifiers of the return types must be the same. 3312 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3313 Diag(New->getLocation(), 3314 diag::err_covariant_return_type_different_qualifications) 3315 << New->getDeclName() << NewTy << OldTy; 3316 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3317 return true; 3318 }; 3319 3320 3321 // The new class type must have the same or less qualifiers as the old type. 3322 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3323 Diag(New->getLocation(), 3324 diag::err_covariant_return_type_class_type_more_qualified) 3325 << New->getDeclName() << NewTy << OldTy; 3326 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3327 return true; 3328 }; 3329 3330 return false; 3331} 3332 3333bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3334 const CXXMethodDecl *Old) 3335{ 3336 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3337 diag::note_overridden_virtual_function, 3338 Old->getType()->getAsFunctionProtoType(), 3339 Old->getLocation(), 3340 New->getType()->getAsFunctionProtoType(), 3341 New->getLocation()); 3342} 3343 3344/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3345/// initializer for the declaration 'Dcl'. 3346/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3347/// static data member of class X, names should be looked up in the scope of 3348/// class X. 3349void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3350 Decl *D = Dcl.getAs<Decl>(); 3351 // If there is no declaration, there was an error parsing it. 3352 if (D == 0) 3353 return; 3354 3355 // Check whether it is a declaration with a nested name specifier like 3356 // int foo::bar; 3357 if (!D->isOutOfLine()) 3358 return; 3359 3360 // C++ [basic.lookup.unqual]p13 3361 // 3362 // A name used in the definition of a static data member of class X 3363 // (after the qualified-id of the static member) is looked up as if the name 3364 // was used in a member function of X. 3365 3366 // Change current context into the context of the initializing declaration. 3367 EnterDeclaratorContext(S, D->getDeclContext()); 3368} 3369 3370/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3371/// initializer for the declaration 'Dcl'. 3372void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3373 Decl *D = Dcl.getAs<Decl>(); 3374 // If there is no declaration, there was an error parsing it. 3375 if (D == 0) 3376 return; 3377 3378 // Check whether it is a declaration with a nested name specifier like 3379 // int foo::bar; 3380 if (!D->isOutOfLine()) 3381 return; 3382 3383 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3384 ExitDeclaratorContext(S); 3385} 3386