SemaDeclCXX.cpp revision f2fedc6aa0e3f74f3c53ff33cf432ba97258c94d
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 (Context) 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); 403 404 // C++ [class.copy]p6: 405 // A copy constructor is trivial if its class has no virtual base classes. 406 Class->setHasTrivialCopyConstructor(false); 407 408 // C++ [class.copy]p11: 409 // A copy assignment operator is trivial if its class has no virtual 410 // base classes. 411 Class->setHasTrivialCopyAssignment(false); 412 } else { 413 // C++ [class.ctor]p5: 414 // A constructor is trivial if all the direct base classes of its 415 // class have trivial constructors. 416 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialConstructor()) 417 Class->setHasTrivialConstructor(false); 418 419 // C++ [class.copy]p6: 420 // A copy constructor is trivial if all the direct base classes of its 421 // class have trivial copy constructors. 422 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyConstructor()) 423 Class->setHasTrivialCopyConstructor(false); 424 425 // C++ [class.copy]p11: 426 // A copy assignment operator is trivial if all the direct base classes 427 // of its class have trivial copy assignment operators. 428 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialCopyAssignment()) 429 Class->setHasTrivialCopyAssignment(false); 430 } 431 432 // C++ [class.ctor]p3: 433 // A destructor is trivial if all the direct base classes of its class 434 // have trivial destructors. 435 if (!cast<CXXRecordDecl>(BaseDecl)->hasTrivialDestructor()) 436 Class->setHasTrivialDestructor(false); 437 438 // Create the base specifier. 439 // FIXME: Allocate via ASTContext? 440 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 441 Class->getTagKind() == RecordDecl::TK_class, 442 Access, BaseType); 443} 444 445/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 446/// one entry in the base class list of a class specifier, for 447/// example: 448/// class foo : public bar, virtual private baz { 449/// 'public bar' and 'virtual private baz' are each base-specifiers. 450Sema::BaseResult 451Sema::ActOnBaseSpecifier(DeclPtrTy classdecl, SourceRange SpecifierRange, 452 bool Virtual, AccessSpecifier Access, 453 TypeTy *basetype, SourceLocation BaseLoc) { 454 if (!classdecl) 455 return true; 456 457 AdjustDeclIfTemplate(classdecl); 458 CXXRecordDecl *Class = cast<CXXRecordDecl>(classdecl.getAs<Decl>()); 459 QualType BaseType = QualType::getFromOpaquePtr(basetype); 460 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 461 Virtual, Access, 462 BaseType, BaseLoc)) 463 return BaseSpec; 464 465 return true; 466} 467 468/// \brief Performs the actual work of attaching the given base class 469/// specifiers to a C++ class. 470bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 471 unsigned NumBases) { 472 if (NumBases == 0) 473 return false; 474 475 // Used to keep track of which base types we have already seen, so 476 // that we can properly diagnose redundant direct base types. Note 477 // that the key is always the unqualified canonical type of the base 478 // class. 479 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 480 481 // Copy non-redundant base specifiers into permanent storage. 482 unsigned NumGoodBases = 0; 483 bool Invalid = false; 484 for (unsigned idx = 0; idx < NumBases; ++idx) { 485 QualType NewBaseType 486 = Context.getCanonicalType(Bases[idx]->getType()); 487 NewBaseType = NewBaseType.getUnqualifiedType(); 488 489 if (KnownBaseTypes[NewBaseType]) { 490 // C++ [class.mi]p3: 491 // A class shall not be specified as a direct base class of a 492 // derived class more than once. 493 Diag(Bases[idx]->getSourceRange().getBegin(), 494 diag::err_duplicate_base_class) 495 << KnownBaseTypes[NewBaseType]->getType() 496 << Bases[idx]->getSourceRange(); 497 498 // Delete the duplicate base class specifier; we're going to 499 // overwrite its pointer later. 500 Context.Deallocate(Bases[idx]); 501 502 Invalid = true; 503 } else { 504 // Okay, add this new base class. 505 KnownBaseTypes[NewBaseType] = Bases[idx]; 506 Bases[NumGoodBases++] = Bases[idx]; 507 } 508 } 509 510 // Attach the remaining base class specifiers to the derived class. 511 Class->setBases(Context, Bases, NumGoodBases); 512 513 // Delete the remaining (good) base class specifiers, since their 514 // data has been copied into the CXXRecordDecl. 515 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 516 Context.Deallocate(Bases[idx]); 517 518 return Invalid; 519} 520 521/// ActOnBaseSpecifiers - Attach the given base specifiers to the 522/// class, after checking whether there are any duplicate base 523/// classes. 524void Sema::ActOnBaseSpecifiers(DeclPtrTy ClassDecl, BaseTy **Bases, 525 unsigned NumBases) { 526 if (!ClassDecl || !Bases || !NumBases) 527 return; 528 529 AdjustDeclIfTemplate(ClassDecl); 530 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl.getAs<Decl>()), 531 (CXXBaseSpecifier**)(Bases), NumBases); 532} 533 534//===----------------------------------------------------------------------===// 535// C++ class member Handling 536//===----------------------------------------------------------------------===// 537 538/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 539/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 540/// bitfield width if there is one and 'InitExpr' specifies the initializer if 541/// any. 542Sema::DeclPtrTy 543Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 544 ExprTy *BW, ExprTy *InitExpr, bool Deleted) { 545 const DeclSpec &DS = D.getDeclSpec(); 546 DeclarationName Name = GetNameForDeclarator(D); 547 Expr *BitWidth = static_cast<Expr*>(BW); 548 Expr *Init = static_cast<Expr*>(InitExpr); 549 SourceLocation Loc = D.getIdentifierLoc(); 550 551 bool isFunc = D.isFunctionDeclarator(); 552 553 // C++ 9.2p6: A member shall not be declared to have automatic storage 554 // duration (auto, register) or with the extern storage-class-specifier. 555 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 556 // data members and cannot be applied to names declared const or static, 557 // and cannot be applied to reference members. 558 switch (DS.getStorageClassSpec()) { 559 case DeclSpec::SCS_unspecified: 560 case DeclSpec::SCS_typedef: 561 case DeclSpec::SCS_static: 562 // FALL THROUGH. 563 break; 564 case DeclSpec::SCS_mutable: 565 if (isFunc) { 566 if (DS.getStorageClassSpecLoc().isValid()) 567 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 568 else 569 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 570 571 // FIXME: It would be nicer if the keyword was ignored only for this 572 // declarator. Otherwise we could get follow-up errors. 573 D.getMutableDeclSpec().ClearStorageClassSpecs(); 574 } else { 575 QualType T = GetTypeForDeclarator(D, S); 576 diag::kind err = static_cast<diag::kind>(0); 577 if (T->isReferenceType()) 578 err = diag::err_mutable_reference; 579 else if (T.isConstQualified()) 580 err = diag::err_mutable_const; 581 if (err != 0) { 582 if (DS.getStorageClassSpecLoc().isValid()) 583 Diag(DS.getStorageClassSpecLoc(), err); 584 else 585 Diag(DS.getThreadSpecLoc(), err); 586 // FIXME: It would be nicer if the keyword was ignored only for this 587 // declarator. Otherwise we could get follow-up errors. 588 D.getMutableDeclSpec().ClearStorageClassSpecs(); 589 } 590 } 591 break; 592 default: 593 if (DS.getStorageClassSpecLoc().isValid()) 594 Diag(DS.getStorageClassSpecLoc(), 595 diag::err_storageclass_invalid_for_member); 596 else 597 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 598 D.getMutableDeclSpec().ClearStorageClassSpecs(); 599 } 600 601 if (!isFunc && 602 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 603 D.getNumTypeObjects() == 0) { 604 // Check also for this case: 605 // 606 // typedef int f(); 607 // f a; 608 // 609 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 610 isFunc = TDType->isFunctionType(); 611 } 612 613 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 614 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 615 !isFunc); 616 617 Decl *Member; 618 if (isInstField) { 619 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 620 AS); 621 assert(Member && "HandleField never returns null"); 622 } else { 623 Member = ActOnDeclarator(S, D).getAs<Decl>(); 624 if (!Member) { 625 if (BitWidth) DeleteExpr(BitWidth); 626 return DeclPtrTy(); 627 } 628 629 // Non-instance-fields can't have a bitfield. 630 if (BitWidth) { 631 if (Member->isInvalidDecl()) { 632 // don't emit another diagnostic. 633 } else if (isa<VarDecl>(Member)) { 634 // C++ 9.6p3: A bit-field shall not be a static member. 635 // "static member 'A' cannot be a bit-field" 636 Diag(Loc, diag::err_static_not_bitfield) 637 << Name << BitWidth->getSourceRange(); 638 } else if (isa<TypedefDecl>(Member)) { 639 // "typedef member 'x' cannot be a bit-field" 640 Diag(Loc, diag::err_typedef_not_bitfield) 641 << Name << BitWidth->getSourceRange(); 642 } else { 643 // A function typedef ("typedef int f(); f a;"). 644 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 645 Diag(Loc, diag::err_not_integral_type_bitfield) 646 << Name << cast<ValueDecl>(Member)->getType() 647 << BitWidth->getSourceRange(); 648 } 649 650 DeleteExpr(BitWidth); 651 BitWidth = 0; 652 Member->setInvalidDecl(); 653 } 654 655 Member->setAccess(AS); 656 } 657 658 assert((Name || isInstField) && "No identifier for non-field ?"); 659 660 if (Init) 661 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 662 if (Deleted) // FIXME: Source location is not very good. 663 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 664 665 if (isInstField) { 666 FieldCollector->Add(cast<FieldDecl>(Member)); 667 return DeclPtrTy(); 668 } 669 return DeclPtrTy::make(Member); 670} 671 672/// ActOnMemInitializer - Handle a C++ member initializer. 673Sema::MemInitResult 674Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 675 Scope *S, 676 const CXXScopeSpec &SS, 677 IdentifierInfo *MemberOrBase, 678 TypeTy *TemplateTypeTy, 679 SourceLocation IdLoc, 680 SourceLocation LParenLoc, 681 ExprTy **Args, unsigned NumArgs, 682 SourceLocation *CommaLocs, 683 SourceLocation RParenLoc) { 684 if (!ConstructorD) 685 return true; 686 687 CXXConstructorDecl *Constructor 688 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 689 if (!Constructor) { 690 // The user wrote a constructor initializer on a function that is 691 // not a C++ constructor. Ignore the error for now, because we may 692 // have more member initializers coming; we'll diagnose it just 693 // once in ActOnMemInitializers. 694 return true; 695 } 696 697 CXXRecordDecl *ClassDecl = Constructor->getParent(); 698 699 // C++ [class.base.init]p2: 700 // Names in a mem-initializer-id are looked up in the scope of the 701 // constructor’s class and, if not found in that scope, are looked 702 // up in the scope containing the constructor’s 703 // definition. [Note: if the constructor’s class contains a member 704 // with the same name as a direct or virtual base class of the 705 // class, a mem-initializer-id naming the member or base class and 706 // composed of a single identifier refers to the class member. A 707 // mem-initializer-id for the hidden base class may be specified 708 // using a qualified name. ] 709 if (!SS.getScopeRep() && !TemplateTypeTy) { 710 // Look for a member, first. 711 FieldDecl *Member = 0; 712 DeclContext::lookup_result Result 713 = ClassDecl->lookup(MemberOrBase); 714 if (Result.first != Result.second) 715 Member = dyn_cast<FieldDecl>(*Result.first); 716 717 // FIXME: Handle members of an anonymous union. 718 719 if (Member) { 720 // FIXME: Perform direct initialization of the member. 721 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 722 NumArgs, IdLoc); 723 } 724 } 725 // It didn't name a member, so see if it names a class. 726 TypeTy *BaseTy = TemplateTypeTy ? TemplateTypeTy 727 : getTypeName(*MemberOrBase, IdLoc, S, &SS); 728 if (!BaseTy) 729 return Diag(IdLoc, diag::err_mem_init_not_member_or_class) 730 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 731 732 QualType BaseType = QualType::getFromOpaquePtr(BaseTy); 733 if (!BaseType->isRecordType() && !BaseType->isDependentType()) 734 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 735 << BaseType << SourceRange(IdLoc, RParenLoc); 736 737 // C++ [class.base.init]p2: 738 // [...] Unless the mem-initializer-id names a nonstatic data 739 // member of the constructor’s class or a direct or virtual base 740 // of that class, the mem-initializer is ill-formed. A 741 // mem-initializer-list can initialize a base class using any 742 // name that denotes that base class type. 743 744 // First, check for a direct base class. 745 const CXXBaseSpecifier *DirectBaseSpec = 0; 746 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(); 747 Base != ClassDecl->bases_end(); ++Base) { 748 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 749 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 750 // We found a direct base of this type. That's what we're 751 // initializing. 752 DirectBaseSpec = &*Base; 753 break; 754 } 755 } 756 757 // Check for a virtual base class. 758 // FIXME: We might be able to short-circuit this if we know in advance that 759 // there are no virtual bases. 760 const CXXBaseSpecifier *VirtualBaseSpec = 0; 761 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 762 // We haven't found a base yet; search the class hierarchy for a 763 // virtual base class. 764 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 765 /*DetectVirtual=*/false); 766 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 767 for (BasePaths::paths_iterator Path = Paths.begin(); 768 Path != Paths.end(); ++Path) { 769 if (Path->back().Base->isVirtual()) { 770 VirtualBaseSpec = Path->back().Base; 771 break; 772 } 773 } 774 } 775 } 776 777 // C++ [base.class.init]p2: 778 // If a mem-initializer-id is ambiguous because it designates both 779 // a direct non-virtual base class and an inherited virtual base 780 // class, the mem-initializer is ill-formed. 781 if (DirectBaseSpec && VirtualBaseSpec) 782 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 783 << MemberOrBase << SourceRange(IdLoc, RParenLoc); 784 // C++ [base.class.init]p2: 785 // Unless the mem-initializer-id names a nonstatic data membeer of the 786 // constructor's class ot a direst or virtual base of that class, the 787 // mem-initializer is ill-formed. 788 if (!DirectBaseSpec && !VirtualBaseSpec) 789 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 790 << BaseType << ClassDecl->getNameAsCString() 791 << SourceRange(IdLoc, RParenLoc); 792 793 794 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 795 NumArgs, IdLoc); 796} 797 798static void *GetKeyForTopLevelField(FieldDecl *Field) { 799 // For anonymous unions, use the class declaration as the key. 800 if (const RecordType *RT = Field->getType()->getAsRecordType()) { 801 if (RT->getDecl()->isAnonymousStructOrUnion()) 802 return static_cast<void *>(RT->getDecl()); 803 } 804 return static_cast<void *>(Field); 805} 806 807static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member) { 808 // For fields injected into the class via declaration of an anonymous union, 809 // use its anonymous union class declaration as the unique key. 810 if (FieldDecl *Field = Member->getMember()) { 811 if (Field->getDeclContext()->isRecord()) { 812 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 813 if (RD->isAnonymousStructOrUnion()) 814 return static_cast<void *>(RD); 815 } 816 return static_cast<void *>(Field); 817 } 818 return static_cast<RecordType *>(Member->getBaseClass()); 819} 820 821void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 822 SourceLocation ColonLoc, 823 MemInitTy **MemInits, unsigned NumMemInits) { 824 if (!ConstructorDecl) 825 return; 826 827 CXXConstructorDecl *Constructor 828 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 829 830 if (!Constructor) { 831 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 832 return; 833 } 834 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 835 bool err = false; 836 for (unsigned i = 0; i < NumMemInits; i++) { 837 CXXBaseOrMemberInitializer *Member = 838 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 839 void *KeyToMember = GetKeyForMember(Member); 840 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 841 if (!PrevMember) { 842 PrevMember = Member; 843 continue; 844 } 845 if (FieldDecl *Field = Member->getMember()) 846 Diag(Member->getSourceLocation(), 847 diag::error_multiple_mem_initialization) 848 << Field->getNameAsString(); 849 else { 850 Type *BaseClass = Member->getBaseClass(); 851 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 852 Diag(Member->getSourceLocation(), 853 diag::error_multiple_base_initialization) 854 << BaseClass->getDesugaredType(true); 855 } 856 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 857 << 0; 858 err = true; 859 } 860 if (!err) { 861 Constructor->setBaseOrMemberInitializers(Context, 862 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 863 NumMemInits); 864 } 865 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 866 != Diagnostic::Ignored || 867 Diags.getDiagnosticLevel(diag::warn_field_initialized) 868 != Diagnostic::Ignored)) { 869 // Also issue warning if order of ctor-initializer list does not match order 870 // of 1) base class declarations and 2) order of non-static data members. 871 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 872 873 CXXRecordDecl *ClassDecl 874 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 875 // Push virtual bases before others. 876 for (CXXRecordDecl::base_class_iterator VBase = 877 ClassDecl->vbases_begin(), 878 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 879 AllBaseOrMembers.push_back(VBase->getType()->getAsRecordType()); 880 881 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 882 E = ClassDecl->bases_end(); Base != E; ++Base) { 883 // Virtuals are alread in the virtual base list and are constructed 884 // first. 885 if (Base->isVirtual()) 886 continue; 887 AllBaseOrMembers.push_back(Base->getType()->getAsRecordType()); 888 } 889 890 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 891 E = ClassDecl->field_end(); Field != E; ++Field) 892 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 893 894 int Last = AllBaseOrMembers.size(); 895 int curIndex = 0; 896 CXXBaseOrMemberInitializer *PrevMember = 0; 897 for (unsigned i = 0; i < NumMemInits; i++) { 898 CXXBaseOrMemberInitializer *Member = 899 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 900 void *MemberInCtorList = GetKeyForMember(Member); 901 902 for (; curIndex < Last; curIndex++) 903 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 904 break; 905 if (curIndex == Last) { 906 assert(PrevMember && "Member not in member list?!"); 907 // Initializer as specified in ctor-initializer list is out of order. 908 // Issue a warning diagnostic. 909 if (PrevMember->isBaseInitializer()) { 910 // Diagnostics is for an initialized base class. 911 Type *BaseClass = PrevMember->getBaseClass(); 912 Diag(PrevMember->getSourceLocation(), 913 diag::warn_base_initialized) 914 << BaseClass->getDesugaredType(true); 915 } 916 else { 917 FieldDecl *Field = PrevMember->getMember(); 918 Diag(PrevMember->getSourceLocation(), 919 diag::warn_field_initialized) 920 << Field->getNameAsString(); 921 } 922 // Also the note! 923 if (FieldDecl *Field = Member->getMember()) 924 Diag(Member->getSourceLocation(), 925 diag::note_fieldorbase_initialized_here) << 0 926 << Field->getNameAsString(); 927 else { 928 Type *BaseClass = Member->getBaseClass(); 929 Diag(Member->getSourceLocation(), 930 diag::note_fieldorbase_initialized_here) << 1 931 << BaseClass->getDesugaredType(true); 932 } 933 for (curIndex = 0; curIndex < Last; curIndex++) 934 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 935 break; 936 } 937 PrevMember = Member; 938 } 939 } 940} 941 942void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 943 if (!CDtorDecl) 944 return; 945 946 if (CXXConstructorDecl *Constructor 947 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 948 Constructor->setBaseOrMemberInitializers(Context, 949 (CXXBaseOrMemberInitializer **)0, 0); 950} 951 952namespace { 953 /// PureVirtualMethodCollector - traverses a class and its superclasses 954 /// and determines if it has any pure virtual methods. 955 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 956 ASTContext &Context; 957 958 public: 959 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 960 961 private: 962 MethodList Methods; 963 964 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 965 966 public: 967 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 968 : Context(Ctx) { 969 970 MethodList List; 971 Collect(RD, List); 972 973 // Copy the temporary list to methods, and make sure to ignore any 974 // null entries. 975 for (size_t i = 0, e = List.size(); i != e; ++i) { 976 if (List[i]) 977 Methods.push_back(List[i]); 978 } 979 } 980 981 bool empty() const { return Methods.empty(); } 982 983 MethodList::const_iterator methods_begin() { return Methods.begin(); } 984 MethodList::const_iterator methods_end() { return Methods.end(); } 985 }; 986 987 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 988 MethodList& Methods) { 989 // First, collect the pure virtual methods for the base classes. 990 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 991 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 992 if (const RecordType *RT = Base->getType()->getAsRecordType()) { 993 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 994 if (BaseDecl && BaseDecl->isAbstract()) 995 Collect(BaseDecl, Methods); 996 } 997 } 998 999 // Next, zero out any pure virtual methods that this class overrides. 1000 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1001 1002 MethodSetTy OverriddenMethods; 1003 size_t MethodsSize = Methods.size(); 1004 1005 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1006 i != e; ++i) { 1007 // Traverse the record, looking for methods. 1008 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1009 // If the method is pure virtual, add it to the methods vector. 1010 if (MD->isPure()) { 1011 Methods.push_back(MD); 1012 continue; 1013 } 1014 1015 // Otherwise, record all the overridden methods in our set. 1016 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1017 E = MD->end_overridden_methods(); I != E; ++I) { 1018 // Keep track of the overridden methods. 1019 OverriddenMethods.insert(*I); 1020 } 1021 } 1022 } 1023 1024 // Now go through the methods and zero out all the ones we know are 1025 // overridden. 1026 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1027 if (OverriddenMethods.count(Methods[i])) 1028 Methods[i] = 0; 1029 } 1030 1031 } 1032} 1033 1034bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1035 unsigned DiagID, AbstractDiagSelID SelID, 1036 const CXXRecordDecl *CurrentRD) { 1037 1038 if (!getLangOptions().CPlusPlus) 1039 return false; 1040 1041 if (const ArrayType *AT = Context.getAsArrayType(T)) 1042 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1043 CurrentRD); 1044 1045 if (const PointerType *PT = T->getAsPointerType()) { 1046 // Find the innermost pointer type. 1047 while (const PointerType *T = PT->getPointeeType()->getAsPointerType()) 1048 PT = T; 1049 1050 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1051 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1052 CurrentRD); 1053 } 1054 1055 const RecordType *RT = T->getAsRecordType(); 1056 if (!RT) 1057 return false; 1058 1059 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1060 if (!RD) 1061 return false; 1062 1063 if (CurrentRD && CurrentRD != RD) 1064 return false; 1065 1066 if (!RD->isAbstract()) 1067 return false; 1068 1069 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1070 1071 // Check if we've already emitted the list of pure virtual functions for this 1072 // class. 1073 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1074 return true; 1075 1076 PureVirtualMethodCollector Collector(Context, RD); 1077 1078 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1079 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1080 const CXXMethodDecl *MD = *I; 1081 1082 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1083 MD->getDeclName(); 1084 } 1085 1086 if (!PureVirtualClassDiagSet) 1087 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1088 PureVirtualClassDiagSet->insert(RD); 1089 1090 return true; 1091} 1092 1093namespace { 1094 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1095 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1096 Sema &SemaRef; 1097 CXXRecordDecl *AbstractClass; 1098 1099 bool VisitDeclContext(const DeclContext *DC) { 1100 bool Invalid = false; 1101 1102 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1103 E = DC->decls_end(); I != E; ++I) 1104 Invalid |= Visit(*I); 1105 1106 return Invalid; 1107 } 1108 1109 public: 1110 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1111 : SemaRef(SemaRef), AbstractClass(ac) { 1112 Visit(SemaRef.Context.getTranslationUnitDecl()); 1113 } 1114 1115 bool VisitFunctionDecl(const FunctionDecl *FD) { 1116 if (FD->isThisDeclarationADefinition()) { 1117 // No need to do the check if we're in a definition, because it requires 1118 // that the return/param types are complete. 1119 // because that requires 1120 return VisitDeclContext(FD); 1121 } 1122 1123 // Check the return type. 1124 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1125 bool Invalid = 1126 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1127 diag::err_abstract_type_in_decl, 1128 Sema::AbstractReturnType, 1129 AbstractClass); 1130 1131 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1132 E = FD->param_end(); I != E; ++I) { 1133 const ParmVarDecl *VD = *I; 1134 Invalid |= 1135 SemaRef.RequireNonAbstractType(VD->getLocation(), 1136 VD->getOriginalType(), 1137 diag::err_abstract_type_in_decl, 1138 Sema::AbstractParamType, 1139 AbstractClass); 1140 } 1141 1142 return Invalid; 1143 } 1144 1145 bool VisitDecl(const Decl* D) { 1146 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1147 return VisitDeclContext(DC); 1148 1149 return false; 1150 } 1151 }; 1152} 1153 1154void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1155 DeclPtrTy TagDecl, 1156 SourceLocation LBrac, 1157 SourceLocation RBrac) { 1158 if (!TagDecl) 1159 return; 1160 1161 AdjustDeclIfTemplate(TagDecl); 1162 ActOnFields(S, RLoc, TagDecl, 1163 (DeclPtrTy*)FieldCollector->getCurFields(), 1164 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1165 1166 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1167 if (!RD->isAbstract()) { 1168 // Collect all the pure virtual methods and see if this is an abstract 1169 // class after all. 1170 PureVirtualMethodCollector Collector(Context, RD); 1171 if (!Collector.empty()) 1172 RD->setAbstract(true); 1173 } 1174 1175 if (RD->isAbstract()) 1176 AbstractClassUsageDiagnoser(*this, RD); 1177 1178 if (!RD->isDependentType()) 1179 AddImplicitlyDeclaredMembersToClass(RD); 1180} 1181 1182/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1183/// special functions, such as the default constructor, copy 1184/// constructor, or destructor, to the given C++ class (C++ 1185/// [special]p1). This routine can only be executed just before the 1186/// definition of the class is complete. 1187void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1188 QualType ClassType = Context.getTypeDeclType(ClassDecl); 1189 ClassType = Context.getCanonicalType(ClassType); 1190 1191 // FIXME: Implicit declarations have exception specifications, which are 1192 // the union of the specifications of the implicitly called functions. 1193 1194 if (!ClassDecl->hasUserDeclaredConstructor()) { 1195 // C++ [class.ctor]p5: 1196 // A default constructor for a class X is a constructor of class X 1197 // that can be called without an argument. If there is no 1198 // user-declared constructor for class X, a default constructor is 1199 // implicitly declared. An implicitly-declared default constructor 1200 // is an inline public member of its class. 1201 DeclarationName Name 1202 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1203 CXXConstructorDecl *DefaultCon = 1204 CXXConstructorDecl::Create(Context, ClassDecl, 1205 ClassDecl->getLocation(), Name, 1206 Context.getFunctionType(Context.VoidTy, 1207 0, 0, false, 0), 1208 /*isExplicit=*/false, 1209 /*isInline=*/true, 1210 /*isImplicitlyDeclared=*/true); 1211 DefaultCon->setAccess(AS_public); 1212 DefaultCon->setImplicit(); 1213 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1214 ClassDecl->addDecl(DefaultCon); 1215 } 1216 1217 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1218 // C++ [class.copy]p4: 1219 // If the class definition does not explicitly declare a copy 1220 // constructor, one is declared implicitly. 1221 1222 // C++ [class.copy]p5: 1223 // The implicitly-declared copy constructor for a class X will 1224 // have the form 1225 // 1226 // X::X(const X&) 1227 // 1228 // if 1229 bool HasConstCopyConstructor = true; 1230 1231 // -- each direct or virtual base class B of X has a copy 1232 // constructor whose first parameter is of type const B& or 1233 // const volatile B&, and 1234 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1235 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1236 const CXXRecordDecl *BaseClassDecl 1237 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1238 HasConstCopyConstructor 1239 = BaseClassDecl->hasConstCopyConstructor(Context); 1240 } 1241 1242 // -- for all the nonstatic data members of X that are of a 1243 // class type M (or array thereof), each such class type 1244 // has a copy constructor whose first parameter is of type 1245 // const M& or const volatile M&. 1246 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1247 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1248 ++Field) { 1249 QualType FieldType = (*Field)->getType(); 1250 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1251 FieldType = Array->getElementType(); 1252 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1253 const CXXRecordDecl *FieldClassDecl 1254 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1255 HasConstCopyConstructor 1256 = FieldClassDecl->hasConstCopyConstructor(Context); 1257 } 1258 } 1259 1260 // Otherwise, the implicitly declared copy constructor will have 1261 // the form 1262 // 1263 // X::X(X&) 1264 QualType ArgType = ClassType; 1265 if (HasConstCopyConstructor) 1266 ArgType = ArgType.withConst(); 1267 ArgType = Context.getLValueReferenceType(ArgType); 1268 1269 // An implicitly-declared copy constructor is an inline public 1270 // member of its class. 1271 DeclarationName Name 1272 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1273 CXXConstructorDecl *CopyConstructor 1274 = CXXConstructorDecl::Create(Context, ClassDecl, 1275 ClassDecl->getLocation(), Name, 1276 Context.getFunctionType(Context.VoidTy, 1277 &ArgType, 1, 1278 false, 0), 1279 /*isExplicit=*/false, 1280 /*isInline=*/true, 1281 /*isImplicitlyDeclared=*/true); 1282 CopyConstructor->setAccess(AS_public); 1283 CopyConstructor->setImplicit(); 1284 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1285 1286 // Add the parameter to the constructor. 1287 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1288 ClassDecl->getLocation(), 1289 /*IdentifierInfo=*/0, 1290 ArgType, VarDecl::None, 0); 1291 CopyConstructor->setParams(Context, &FromParam, 1); 1292 ClassDecl->addDecl(CopyConstructor); 1293 } 1294 1295 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1296 // Note: The following rules are largely analoguous to the copy 1297 // constructor rules. Note that virtual bases are not taken into account 1298 // for determining the argument type of the operator. Note also that 1299 // operators taking an object instead of a reference are allowed. 1300 // 1301 // C++ [class.copy]p10: 1302 // If the class definition does not explicitly declare a copy 1303 // assignment operator, one is declared implicitly. 1304 // The implicitly-defined copy assignment operator for a class X 1305 // will have the form 1306 // 1307 // X& X::operator=(const X&) 1308 // 1309 // if 1310 bool HasConstCopyAssignment = true; 1311 1312 // -- each direct base class B of X has a copy assignment operator 1313 // whose parameter is of type const B&, const volatile B& or B, 1314 // and 1315 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1316 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1317 const CXXRecordDecl *BaseClassDecl 1318 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 1319 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1320 } 1321 1322 // -- for all the nonstatic data members of X that are of a class 1323 // type M (or array thereof), each such class type has a copy 1324 // assignment operator whose parameter is of type const M&, 1325 // const volatile M& or M. 1326 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1327 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1328 ++Field) { 1329 QualType FieldType = (*Field)->getType(); 1330 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1331 FieldType = Array->getElementType(); 1332 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 1333 const CXXRecordDecl *FieldClassDecl 1334 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1335 HasConstCopyAssignment 1336 = FieldClassDecl->hasConstCopyAssignment(Context); 1337 } 1338 } 1339 1340 // Otherwise, the implicitly declared copy assignment operator will 1341 // have the form 1342 // 1343 // X& X::operator=(X&) 1344 QualType ArgType = ClassType; 1345 QualType RetType = Context.getLValueReferenceType(ArgType); 1346 if (HasConstCopyAssignment) 1347 ArgType = ArgType.withConst(); 1348 ArgType = Context.getLValueReferenceType(ArgType); 1349 1350 // An implicitly-declared copy assignment operator is an inline public 1351 // member of its class. 1352 DeclarationName Name = 1353 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1354 CXXMethodDecl *CopyAssignment = 1355 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1356 Context.getFunctionType(RetType, &ArgType, 1, 1357 false, 0), 1358 /*isStatic=*/false, /*isInline=*/true); 1359 CopyAssignment->setAccess(AS_public); 1360 CopyAssignment->setImplicit(); 1361 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1362 1363 // Add the parameter to the operator. 1364 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1365 ClassDecl->getLocation(), 1366 /*IdentifierInfo=*/0, 1367 ArgType, VarDecl::None, 0); 1368 CopyAssignment->setParams(Context, &FromParam, 1); 1369 1370 // Don't call addedAssignmentOperator. There is no way to distinguish an 1371 // implicit from an explicit assignment operator. 1372 ClassDecl->addDecl(CopyAssignment); 1373 } 1374 1375 if (!ClassDecl->hasUserDeclaredDestructor()) { 1376 // C++ [class.dtor]p2: 1377 // If a class has no user-declared destructor, a destructor is 1378 // declared implicitly. An implicitly-declared destructor is an 1379 // inline public member of its class. 1380 DeclarationName Name 1381 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1382 CXXDestructorDecl *Destructor 1383 = CXXDestructorDecl::Create(Context, ClassDecl, 1384 ClassDecl->getLocation(), Name, 1385 Context.getFunctionType(Context.VoidTy, 1386 0, 0, false, 0), 1387 /*isInline=*/true, 1388 /*isImplicitlyDeclared=*/true); 1389 Destructor->setAccess(AS_public); 1390 Destructor->setImplicit(); 1391 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1392 ClassDecl->addDecl(Destructor); 1393 } 1394} 1395 1396void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1397 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1398 if (!Template) 1399 return; 1400 1401 TemplateParameterList *Params = Template->getTemplateParameters(); 1402 for (TemplateParameterList::iterator Param = Params->begin(), 1403 ParamEnd = Params->end(); 1404 Param != ParamEnd; ++Param) { 1405 NamedDecl *Named = cast<NamedDecl>(*Param); 1406 if (Named->getDeclName()) { 1407 S->AddDecl(DeclPtrTy::make(Named)); 1408 IdResolver.AddDecl(Named); 1409 } 1410 } 1411} 1412 1413/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1414/// parsing a top-level (non-nested) C++ class, and we are now 1415/// parsing those parts of the given Method declaration that could 1416/// not be parsed earlier (C++ [class.mem]p2), such as default 1417/// arguments. This action should enter the scope of the given 1418/// Method declaration as if we had just parsed the qualified method 1419/// name. However, it should not bring the parameters into scope; 1420/// that will be performed by ActOnDelayedCXXMethodParameter. 1421void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1422 if (!MethodD) 1423 return; 1424 1425 CXXScopeSpec SS; 1426 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1427 QualType ClassTy 1428 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1429 SS.setScopeRep( 1430 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1431 ActOnCXXEnterDeclaratorScope(S, SS); 1432} 1433 1434/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1435/// C++ method declaration. We're (re-)introducing the given 1436/// function parameter into scope for use in parsing later parts of 1437/// the method declaration. For example, we could see an 1438/// ActOnParamDefaultArgument event for this parameter. 1439void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1440 if (!ParamD) 1441 return; 1442 1443 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1444 1445 // If this parameter has an unparsed default argument, clear it out 1446 // to make way for the parsed default argument. 1447 if (Param->hasUnparsedDefaultArg()) 1448 Param->setDefaultArg(0); 1449 1450 S->AddDecl(DeclPtrTy::make(Param)); 1451 if (Param->getDeclName()) 1452 IdResolver.AddDecl(Param); 1453} 1454 1455/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1456/// processing the delayed method declaration for Method. The method 1457/// declaration is now considered finished. There may be a separate 1458/// ActOnStartOfFunctionDef action later (not necessarily 1459/// immediately!) for this method, if it was also defined inside the 1460/// class body. 1461void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1462 if (!MethodD) 1463 return; 1464 1465 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1466 CXXScopeSpec SS; 1467 QualType ClassTy 1468 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1469 SS.setScopeRep( 1470 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1471 ActOnCXXExitDeclaratorScope(S, SS); 1472 1473 // Now that we have our default arguments, check the constructor 1474 // again. It could produce additional diagnostics or affect whether 1475 // the class has implicitly-declared destructors, among other 1476 // things. 1477 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1478 CheckConstructor(Constructor); 1479 1480 // Check the default arguments, which we may have added. 1481 if (!Method->isInvalidDecl()) 1482 CheckCXXDefaultArguments(Method); 1483} 1484 1485/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1486/// the well-formedness of the constructor declarator @p D with type @p 1487/// R. If there are any errors in the declarator, this routine will 1488/// emit diagnostics and set the invalid bit to true. In any case, the type 1489/// will be updated to reflect a well-formed type for the constructor and 1490/// returned. 1491QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1492 FunctionDecl::StorageClass &SC) { 1493 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1494 1495 // C++ [class.ctor]p3: 1496 // A constructor shall not be virtual (10.3) or static (9.4). A 1497 // constructor can be invoked for a const, volatile or const 1498 // volatile object. A constructor shall not be declared const, 1499 // volatile, or const volatile (9.3.2). 1500 if (isVirtual) { 1501 if (!D.isInvalidType()) 1502 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1503 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1504 << SourceRange(D.getIdentifierLoc()); 1505 D.setInvalidType(); 1506 } 1507 if (SC == FunctionDecl::Static) { 1508 if (!D.isInvalidType()) 1509 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1510 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1511 << SourceRange(D.getIdentifierLoc()); 1512 D.setInvalidType(); 1513 SC = FunctionDecl::None; 1514 } 1515 1516 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1517 if (FTI.TypeQuals != 0) { 1518 if (FTI.TypeQuals & QualType::Const) 1519 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1520 << "const" << SourceRange(D.getIdentifierLoc()); 1521 if (FTI.TypeQuals & QualType::Volatile) 1522 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1523 << "volatile" << SourceRange(D.getIdentifierLoc()); 1524 if (FTI.TypeQuals & QualType::Restrict) 1525 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1526 << "restrict" << SourceRange(D.getIdentifierLoc()); 1527 } 1528 1529 // Rebuild the function type "R" without any type qualifiers (in 1530 // case any of the errors above fired) and with "void" as the 1531 // return type, since constructors don't have return types. We 1532 // *always* have to do this, because GetTypeForDeclarator will 1533 // put in a result type of "int" when none was specified. 1534 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1535 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1536 Proto->getNumArgs(), 1537 Proto->isVariadic(), 0); 1538} 1539 1540/// CheckConstructor - Checks a fully-formed constructor for 1541/// well-formedness, issuing any diagnostics required. Returns true if 1542/// the constructor declarator is invalid. 1543void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1544 CXXRecordDecl *ClassDecl 1545 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1546 if (!ClassDecl) 1547 return Constructor->setInvalidDecl(); 1548 1549 // C++ [class.copy]p3: 1550 // A declaration of a constructor for a class X is ill-formed if 1551 // its first parameter is of type (optionally cv-qualified) X and 1552 // either there are no other parameters or else all other 1553 // parameters have default arguments. 1554 if (!Constructor->isInvalidDecl() && 1555 ((Constructor->getNumParams() == 1) || 1556 (Constructor->getNumParams() > 1 && 1557 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1558 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1559 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1560 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1561 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1562 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1563 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1564 Constructor->setInvalidDecl(); 1565 } 1566 } 1567 1568 // Notify the class that we've added a constructor. 1569 ClassDecl->addedConstructor(Context, Constructor); 1570} 1571 1572static inline bool 1573FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1574 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1575 FTI.ArgInfo[0].Param && 1576 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1577} 1578 1579/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1580/// the well-formednes of the destructor declarator @p D with type @p 1581/// R. If there are any errors in the declarator, this routine will 1582/// emit diagnostics and set the declarator to invalid. Even if this happens, 1583/// will be updated to reflect a well-formed type for the destructor and 1584/// returned. 1585QualType Sema::CheckDestructorDeclarator(Declarator &D, 1586 FunctionDecl::StorageClass& SC) { 1587 // C++ [class.dtor]p1: 1588 // [...] A typedef-name that names a class is a class-name 1589 // (7.1.3); however, a typedef-name that names a class shall not 1590 // be used as the identifier in the declarator for a destructor 1591 // declaration. 1592 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1593 if (isa<TypedefType>(DeclaratorType)) { 1594 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1595 << DeclaratorType; 1596 D.setInvalidType(); 1597 } 1598 1599 // C++ [class.dtor]p2: 1600 // A destructor is used to destroy objects of its class type. A 1601 // destructor takes no parameters, and no return type can be 1602 // specified for it (not even void). The address of a destructor 1603 // shall not be taken. A destructor shall not be static. A 1604 // destructor can be invoked for a const, volatile or const 1605 // volatile object. A destructor shall not be declared const, 1606 // volatile or const volatile (9.3.2). 1607 if (SC == FunctionDecl::Static) { 1608 if (!D.isInvalidType()) 1609 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1610 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1611 << SourceRange(D.getIdentifierLoc()); 1612 SC = FunctionDecl::None; 1613 D.setInvalidType(); 1614 } 1615 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1616 // Destructors don't have return types, but the parser will 1617 // happily parse something like: 1618 // 1619 // class X { 1620 // float ~X(); 1621 // }; 1622 // 1623 // The return type will be eliminated later. 1624 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1625 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1626 << SourceRange(D.getIdentifierLoc()); 1627 } 1628 1629 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1630 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1631 if (FTI.TypeQuals & QualType::Const) 1632 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1633 << "const" << SourceRange(D.getIdentifierLoc()); 1634 if (FTI.TypeQuals & QualType::Volatile) 1635 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1636 << "volatile" << SourceRange(D.getIdentifierLoc()); 1637 if (FTI.TypeQuals & QualType::Restrict) 1638 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1639 << "restrict" << SourceRange(D.getIdentifierLoc()); 1640 D.setInvalidType(); 1641 } 1642 1643 // Make sure we don't have any parameters. 1644 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1645 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1646 1647 // Delete the parameters. 1648 FTI.freeArgs(); 1649 D.setInvalidType(); 1650 } 1651 1652 // Make sure the destructor isn't variadic. 1653 if (FTI.isVariadic) { 1654 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1655 D.setInvalidType(); 1656 } 1657 1658 // Rebuild the function type "R" without any type qualifiers or 1659 // parameters (in case any of the errors above fired) and with 1660 // "void" as the return type, since destructors don't have return 1661 // types. We *always* have to do this, because GetTypeForDeclarator 1662 // will put in a result type of "int" when none was specified. 1663 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1664} 1665 1666/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1667/// well-formednes of the conversion function declarator @p D with 1668/// type @p R. If there are any errors in the declarator, this routine 1669/// will emit diagnostics and return true. Otherwise, it will return 1670/// false. Either way, the type @p R will be updated to reflect a 1671/// well-formed type for the conversion operator. 1672void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1673 FunctionDecl::StorageClass& SC) { 1674 // C++ [class.conv.fct]p1: 1675 // Neither parameter types nor return type can be specified. The 1676 // type of a conversion function (8.3.5) is “function taking no 1677 // parameter returning conversion-type-id.” 1678 if (SC == FunctionDecl::Static) { 1679 if (!D.isInvalidType()) 1680 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1681 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1682 << SourceRange(D.getIdentifierLoc()); 1683 D.setInvalidType(); 1684 SC = FunctionDecl::None; 1685 } 1686 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1687 // Conversion functions don't have return types, but the parser will 1688 // happily parse something like: 1689 // 1690 // class X { 1691 // float operator bool(); 1692 // }; 1693 // 1694 // The return type will be changed later anyway. 1695 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1696 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1697 << SourceRange(D.getIdentifierLoc()); 1698 } 1699 1700 // Make sure we don't have any parameters. 1701 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1702 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1703 1704 // Delete the parameters. 1705 D.getTypeObject(0).Fun.freeArgs(); 1706 D.setInvalidType(); 1707 } 1708 1709 // Make sure the conversion function isn't variadic. 1710 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1711 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1712 D.setInvalidType(); 1713 } 1714 1715 // C++ [class.conv.fct]p4: 1716 // The conversion-type-id shall not represent a function type nor 1717 // an array type. 1718 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1719 if (ConvType->isArrayType()) { 1720 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1721 ConvType = Context.getPointerType(ConvType); 1722 D.setInvalidType(); 1723 } else if (ConvType->isFunctionType()) { 1724 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1725 ConvType = Context.getPointerType(ConvType); 1726 D.setInvalidType(); 1727 } 1728 1729 // Rebuild the function type "R" without any parameters (in case any 1730 // of the errors above fired) and with the conversion type as the 1731 // return type. 1732 R = Context.getFunctionType(ConvType, 0, 0, false, 1733 R->getAsFunctionProtoType()->getTypeQuals()); 1734 1735 // C++0x explicit conversion operators. 1736 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1737 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1738 diag::warn_explicit_conversion_functions) 1739 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1740} 1741 1742/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1743/// the declaration of the given C++ conversion function. This routine 1744/// is responsible for recording the conversion function in the C++ 1745/// class, if possible. 1746Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1747 assert(Conversion && "Expected to receive a conversion function declaration"); 1748 1749 // Set the lexical context of this conversion function 1750 Conversion->setLexicalDeclContext(CurContext); 1751 1752 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1753 1754 // Make sure we aren't redeclaring the conversion function. 1755 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1756 1757 // C++ [class.conv.fct]p1: 1758 // [...] A conversion function is never used to convert a 1759 // (possibly cv-qualified) object to the (possibly cv-qualified) 1760 // same object type (or a reference to it), to a (possibly 1761 // cv-qualified) base class of that type (or a reference to it), 1762 // or to (possibly cv-qualified) void. 1763 // FIXME: Suppress this warning if the conversion function ends up being a 1764 // virtual function that overrides a virtual function in a base class. 1765 QualType ClassType 1766 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1767 if (const ReferenceType *ConvTypeRef = ConvType->getAsReferenceType()) 1768 ConvType = ConvTypeRef->getPointeeType(); 1769 if (ConvType->isRecordType()) { 1770 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1771 if (ConvType == ClassType) 1772 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1773 << ClassType; 1774 else if (IsDerivedFrom(ClassType, ConvType)) 1775 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1776 << ClassType << ConvType; 1777 } else if (ConvType->isVoidType()) { 1778 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1779 << ClassType << ConvType; 1780 } 1781 1782 if (Conversion->getPreviousDeclaration()) { 1783 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1784 for (OverloadedFunctionDecl::function_iterator 1785 Conv = Conversions->function_begin(), 1786 ConvEnd = Conversions->function_end(); 1787 Conv != ConvEnd; ++Conv) { 1788 if (*Conv 1789 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1790 *Conv = Conversion; 1791 return DeclPtrTy::make(Conversion); 1792 } 1793 } 1794 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1795 } else 1796 ClassDecl->addConversionFunction(Context, Conversion); 1797 1798 return DeclPtrTy::make(Conversion); 1799} 1800 1801//===----------------------------------------------------------------------===// 1802// Namespace Handling 1803//===----------------------------------------------------------------------===// 1804 1805/// ActOnStartNamespaceDef - This is called at the start of a namespace 1806/// definition. 1807Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1808 SourceLocation IdentLoc, 1809 IdentifierInfo *II, 1810 SourceLocation LBrace) { 1811 NamespaceDecl *Namespc = 1812 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1813 Namespc->setLBracLoc(LBrace); 1814 1815 Scope *DeclRegionScope = NamespcScope->getParent(); 1816 1817 if (II) { 1818 // C++ [namespace.def]p2: 1819 // The identifier in an original-namespace-definition shall not have been 1820 // previously defined in the declarative region in which the 1821 // original-namespace-definition appears. The identifier in an 1822 // original-namespace-definition is the name of the namespace. Subsequently 1823 // in that declarative region, it is treated as an original-namespace-name. 1824 1825 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1826 true); 1827 1828 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1829 // This is an extended namespace definition. 1830 // Attach this namespace decl to the chain of extended namespace 1831 // definitions. 1832 OrigNS->setNextNamespace(Namespc); 1833 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1834 1835 // Remove the previous declaration from the scope. 1836 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1837 IdResolver.RemoveDecl(OrigNS); 1838 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1839 } 1840 } else if (PrevDecl) { 1841 // This is an invalid name redefinition. 1842 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1843 << Namespc->getDeclName(); 1844 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1845 Namespc->setInvalidDecl(); 1846 // Continue on to push Namespc as current DeclContext and return it. 1847 } 1848 1849 PushOnScopeChains(Namespc, DeclRegionScope); 1850 } else { 1851 // FIXME: Handle anonymous namespaces 1852 } 1853 1854 // Although we could have an invalid decl (i.e. the namespace name is a 1855 // redefinition), push it as current DeclContext and try to continue parsing. 1856 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1857 // for the namespace has the declarations that showed up in that particular 1858 // namespace definition. 1859 PushDeclContext(NamespcScope, Namespc); 1860 return DeclPtrTy::make(Namespc); 1861} 1862 1863/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1864/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1865void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1866 Decl *Dcl = D.getAs<Decl>(); 1867 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1868 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1869 Namespc->setRBracLoc(RBrace); 1870 PopDeclContext(); 1871} 1872 1873Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1874 SourceLocation UsingLoc, 1875 SourceLocation NamespcLoc, 1876 const CXXScopeSpec &SS, 1877 SourceLocation IdentLoc, 1878 IdentifierInfo *NamespcName, 1879 AttributeList *AttrList) { 1880 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1881 assert(NamespcName && "Invalid NamespcName."); 1882 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1883 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1884 1885 UsingDirectiveDecl *UDir = 0; 1886 1887 // Lookup namespace name. 1888 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1889 LookupNamespaceName, false); 1890 if (R.isAmbiguous()) { 1891 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1892 return DeclPtrTy(); 1893 } 1894 if (NamedDecl *NS = R) { 1895 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1896 // C++ [namespace.udir]p1: 1897 // A using-directive specifies that the names in the nominated 1898 // namespace can be used in the scope in which the 1899 // using-directive appears after the using-directive. During 1900 // unqualified name lookup (3.4.1), the names appear as if they 1901 // were declared in the nearest enclosing namespace which 1902 // contains both the using-directive and the nominated 1903 // namespace. [Note: in this context, “contains” means “contains 1904 // directly or indirectly”. ] 1905 1906 // Find enclosing context containing both using-directive and 1907 // nominated namespace. 1908 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1909 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1910 CommonAncestor = CommonAncestor->getParent(); 1911 1912 UDir = UsingDirectiveDecl::Create(Context, 1913 CurContext, UsingLoc, 1914 NamespcLoc, 1915 SS.getRange(), 1916 (NestedNameSpecifier *)SS.getScopeRep(), 1917 IdentLoc, 1918 cast<NamespaceDecl>(NS), 1919 CommonAncestor); 1920 PushUsingDirective(S, UDir); 1921 } else { 1922 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 1923 } 1924 1925 // FIXME: We ignore attributes for now. 1926 delete AttrList; 1927 return DeclPtrTy::make(UDir); 1928} 1929 1930void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 1931 // If scope has associated entity, then using directive is at namespace 1932 // or translation unit scope. We add UsingDirectiveDecls, into 1933 // it's lookup structure. 1934 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 1935 Ctx->addDecl(UDir); 1936 else 1937 // Otherwise it is block-sope. using-directives will affect lookup 1938 // only to the end of scope. 1939 S->PushUsingDirective(DeclPtrTy::make(UDir)); 1940} 1941 1942 1943Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 1944 SourceLocation UsingLoc, 1945 const CXXScopeSpec &SS, 1946 SourceLocation IdentLoc, 1947 IdentifierInfo *TargetName, 1948 OverloadedOperatorKind Op, 1949 AttributeList *AttrList, 1950 bool IsTypeName) { 1951 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1952 assert((TargetName || Op) && "Invalid TargetName."); 1953 assert(IdentLoc.isValid() && "Invalid TargetName location."); 1954 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1955 1956 UsingDecl *UsingAlias = 0; 1957 1958 DeclarationName Name; 1959 if (TargetName) 1960 Name = TargetName; 1961 else 1962 Name = Context.DeclarationNames.getCXXOperatorName(Op); 1963 1964 // Lookup target name. 1965 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 1966 1967 if (NamedDecl *NS = R) { 1968 if (IsTypeName && !isa<TypeDecl>(NS)) { 1969 Diag(IdentLoc, diag::err_using_typename_non_type); 1970 } 1971 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 1972 NS->getLocation(), UsingLoc, NS, 1973 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 1974 IsTypeName); 1975 PushOnScopeChains(UsingAlias, S); 1976 } else { 1977 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 1978 } 1979 1980 // FIXME: We ignore attributes for now. 1981 delete AttrList; 1982 return DeclPtrTy::make(UsingAlias); 1983} 1984 1985/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 1986/// is a namespace alias, returns the namespace it points to. 1987static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 1988 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 1989 return AD->getNamespace(); 1990 return dyn_cast_or_null<NamespaceDecl>(D); 1991} 1992 1993Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 1994 SourceLocation NamespaceLoc, 1995 SourceLocation AliasLoc, 1996 IdentifierInfo *Alias, 1997 const CXXScopeSpec &SS, 1998 SourceLocation IdentLoc, 1999 IdentifierInfo *Ident) { 2000 2001 // Lookup the namespace name. 2002 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2003 2004 // Check if we have a previous declaration with the same name. 2005 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2006 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2007 // We already have an alias with the same name that points to the same 2008 // namespace, so don't create a new one. 2009 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2010 return DeclPtrTy(); 2011 } 2012 2013 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2014 diag::err_redefinition_different_kind; 2015 Diag(AliasLoc, DiagID) << Alias; 2016 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2017 return DeclPtrTy(); 2018 } 2019 2020 if (R.isAmbiguous()) { 2021 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2022 return DeclPtrTy(); 2023 } 2024 2025 if (!R) { 2026 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2027 return DeclPtrTy(); 2028 } 2029 2030 NamespaceAliasDecl *AliasDecl = 2031 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2032 Alias, SS.getRange(), 2033 (NestedNameSpecifier *)SS.getScopeRep(), 2034 IdentLoc, R); 2035 2036 CurContext->addDecl(AliasDecl); 2037 return DeclPtrTy::make(AliasDecl); 2038} 2039 2040void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2041 CXXConstructorDecl *Constructor) { 2042 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2043 !Constructor->isUsed()) && 2044 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2045 2046 CXXRecordDecl *ClassDecl 2047 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2048 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2049 // Before the implicitly-declared default constructor for a class is 2050 // implicitly defined, all the implicitly-declared default constructors 2051 // for its base class and its non-static data members shall have been 2052 // implicitly defined. 2053 bool err = false; 2054 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2055 E = ClassDecl->bases_end(); Base != E; ++Base) { 2056 CXXRecordDecl *BaseClassDecl 2057 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2058 if (!BaseClassDecl->hasTrivialConstructor()) { 2059 if (CXXConstructorDecl *BaseCtor = 2060 BaseClassDecl->getDefaultConstructor(Context)) 2061 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2062 else { 2063 Diag(CurrentLocation, diag::err_defining_default_ctor) 2064 << Context.getTagDeclType(ClassDecl) << 1 2065 << Context.getTagDeclType(BaseClassDecl); 2066 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2067 << Context.getTagDeclType(BaseClassDecl); 2068 err = true; 2069 } 2070 } 2071 } 2072 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2073 E = ClassDecl->field_end(); Field != E; ++Field) { 2074 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2075 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2076 FieldType = Array->getElementType(); 2077 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2078 CXXRecordDecl *FieldClassDecl 2079 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2080 if (!FieldClassDecl->hasTrivialConstructor()) { 2081 if (CXXConstructorDecl *FieldCtor = 2082 FieldClassDecl->getDefaultConstructor(Context)) 2083 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2084 else { 2085 Diag(CurrentLocation, diag::err_defining_default_ctor) 2086 << Context.getTagDeclType(ClassDecl) << 0 << 2087 Context.getTagDeclType(FieldClassDecl); 2088 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2089 << Context.getTagDeclType(FieldClassDecl); 2090 err = true; 2091 } 2092 } 2093 } 2094 else if (FieldType->isReferenceType()) { 2095 Diag(CurrentLocation, diag::err_unintialized_member) 2096 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2097 Diag((*Field)->getLocation(), diag::note_declared_at); 2098 err = true; 2099 } 2100 else if (FieldType.isConstQualified()) { 2101 Diag(CurrentLocation, diag::err_unintialized_member) 2102 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2103 Diag((*Field)->getLocation(), diag::note_declared_at); 2104 err = true; 2105 } 2106 } 2107 if (!err) 2108 Constructor->setUsed(); 2109 else 2110 Constructor->setInvalidDecl(); 2111} 2112 2113void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2114 CXXDestructorDecl *Destructor) { 2115 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2116 "DefineImplicitDestructor - call it for implicit default dtor"); 2117 2118 CXXRecordDecl *ClassDecl 2119 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2120 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2121 // C++ [class.dtor] p5 2122 // Before the implicitly-declared default destructor for a class is 2123 // implicitly defined, all the implicitly-declared default destructors 2124 // for its base class and its non-static data members shall have been 2125 // implicitly defined. 2126 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2127 E = ClassDecl->bases_end(); Base != E; ++Base) { 2128 CXXRecordDecl *BaseClassDecl 2129 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2130 if (!BaseClassDecl->hasTrivialDestructor()) { 2131 if (CXXDestructorDecl *BaseDtor = 2132 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2133 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2134 else 2135 assert(false && 2136 "DefineImplicitDestructor - missing dtor in a base class"); 2137 } 2138 } 2139 2140 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2141 E = ClassDecl->field_end(); Field != E; ++Field) { 2142 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2143 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2144 FieldType = Array->getElementType(); 2145 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2146 CXXRecordDecl *FieldClassDecl 2147 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2148 if (!FieldClassDecl->hasTrivialDestructor()) { 2149 if (CXXDestructorDecl *FieldDtor = 2150 const_cast<CXXDestructorDecl*>( 2151 FieldClassDecl->getDestructor(Context))) 2152 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2153 else 2154 assert(false && 2155 "DefineImplicitDestructor - missing dtor in class of a data member"); 2156 } 2157 } 2158 } 2159 Destructor->setUsed(); 2160} 2161 2162void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2163 CXXMethodDecl *MethodDecl) { 2164 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2165 MethodDecl->getOverloadedOperator() == OO_Equal && 2166 !MethodDecl->isUsed()) && 2167 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2168 2169 CXXRecordDecl *ClassDecl 2170 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2171 2172 // C++[class.copy] p12 2173 // Before the implicitly-declared copy assignment operator for a class is 2174 // implicitly defined, all implicitly-declared copy assignment operators 2175 // for its direct base classes and its nonstatic data members shall have 2176 // been implicitly defined. 2177 bool err = false; 2178 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2179 E = ClassDecl->bases_end(); Base != E; ++Base) { 2180 CXXRecordDecl *BaseClassDecl 2181 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2182 if (CXXMethodDecl *BaseAssignOpMethod = 2183 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2184 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2185 } 2186 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2187 E = ClassDecl->field_end(); Field != E; ++Field) { 2188 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2189 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2190 FieldType = Array->getElementType(); 2191 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2192 CXXRecordDecl *FieldClassDecl 2193 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2194 if (CXXMethodDecl *FieldAssignOpMethod = 2195 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2196 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2197 } 2198 else if (FieldType->isReferenceType()) { 2199 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2200 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2201 Diag(Field->getLocation(), diag::note_declared_at); 2202 Diag(CurrentLocation, diag::note_first_required_here); 2203 err = true; 2204 } 2205 else if (FieldType.isConstQualified()) { 2206 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2207 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2208 Diag(Field->getLocation(), diag::note_declared_at); 2209 Diag(CurrentLocation, diag::note_first_required_here); 2210 err = true; 2211 } 2212 } 2213 if (!err) 2214 MethodDecl->setUsed(); 2215} 2216 2217CXXMethodDecl * 2218Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2219 CXXRecordDecl *ClassDecl) { 2220 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2221 QualType RHSType(LHSType); 2222 // If class's assignment operator argument is const/volatile qualified, 2223 // look for operator = (const/volatile B&). Otherwise, look for 2224 // operator = (B&). 2225 if (ParmDecl->getType().isConstQualified()) 2226 RHSType.addConst(); 2227 if (ParmDecl->getType().isVolatileQualified()) 2228 RHSType.addVolatile(); 2229 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2230 LHSType, 2231 SourceLocation())); 2232 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2233 RHSType, 2234 SourceLocation())); 2235 Expr *Args[2] = { &*LHS, &*RHS }; 2236 OverloadCandidateSet CandidateSet; 2237 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2238 CandidateSet); 2239 OverloadCandidateSet::iterator Best; 2240 if (BestViableFunction(CandidateSet, 2241 ClassDecl->getLocation(), Best) == OR_Success) 2242 return cast<CXXMethodDecl>(Best->Function); 2243 assert(false && 2244 "getAssignOperatorMethod - copy assignment operator method not found"); 2245 return 0; 2246} 2247 2248void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2249 CXXConstructorDecl *CopyConstructor, 2250 unsigned TypeQuals) { 2251 assert((CopyConstructor->isImplicit() && 2252 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2253 !CopyConstructor->isUsed()) && 2254 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2255 2256 CXXRecordDecl *ClassDecl 2257 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2258 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2259 // C++ [class.copy] p209 2260 // Before the implicitly-declared copy constructor for a class is 2261 // implicitly defined, all the implicitly-declared copy constructors 2262 // for its base class and its non-static data members shall have been 2263 // implicitly defined. 2264 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2265 Base != ClassDecl->bases_end(); ++Base) { 2266 CXXRecordDecl *BaseClassDecl 2267 = cast<CXXRecordDecl>(Base->getType()->getAsRecordType()->getDecl()); 2268 if (CXXConstructorDecl *BaseCopyCtor = 2269 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2270 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2271 } 2272 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2273 FieldEnd = ClassDecl->field_end(); 2274 Field != FieldEnd; ++Field) { 2275 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2276 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2277 FieldType = Array->getElementType(); 2278 if (const RecordType *FieldClassType = FieldType->getAsRecordType()) { 2279 CXXRecordDecl *FieldClassDecl 2280 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2281 if (CXXConstructorDecl *FieldCopyCtor = 2282 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2283 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2284 } 2285 } 2286 CopyConstructor->setUsed(); 2287} 2288 2289void Sema::InitializeVarWithConstructor(VarDecl *VD, 2290 CXXConstructorDecl *Constructor, 2291 QualType DeclInitType, 2292 Expr **Exprs, unsigned NumExprs) { 2293 Expr *Temp = CXXConstructExpr::Create(Context, DeclInitType, Constructor, 2294 false, Exprs, NumExprs); 2295 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2296 VD->setInit(Context, Temp); 2297} 2298 2299void Sema::MarkDestructorReferenced(SourceLocation Loc, QualType DeclInitType) 2300{ 2301 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2302 DeclInitType->getAsRecordType()->getDecl()); 2303 if (!ClassDecl->hasTrivialDestructor()) 2304 if (CXXDestructorDecl *Destructor = 2305 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2306 MarkDeclarationReferenced(Loc, Destructor); 2307} 2308 2309/// AddCXXDirectInitializerToDecl - This action is called immediately after 2310/// ActOnDeclarator, when a C++ direct initializer is present. 2311/// e.g: "int x(1);" 2312void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2313 SourceLocation LParenLoc, 2314 MultiExprArg Exprs, 2315 SourceLocation *CommaLocs, 2316 SourceLocation RParenLoc) { 2317 unsigned NumExprs = Exprs.size(); 2318 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2319 Decl *RealDecl = Dcl.getAs<Decl>(); 2320 2321 // If there is no declaration, there was an error parsing it. Just ignore 2322 // the initializer. 2323 if (RealDecl == 0) 2324 return; 2325 2326 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2327 if (!VDecl) { 2328 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2329 RealDecl->setInvalidDecl(); 2330 return; 2331 } 2332 2333 // FIXME: Need to handle dependent types and expressions here. 2334 2335 // We will treat direct-initialization as a copy-initialization: 2336 // int x(1); -as-> int x = 1; 2337 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2338 // 2339 // Clients that want to distinguish between the two forms, can check for 2340 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2341 // A major benefit is that clients that don't particularly care about which 2342 // exactly form was it (like the CodeGen) can handle both cases without 2343 // special case code. 2344 2345 // C++ 8.5p11: 2346 // The form of initialization (using parentheses or '=') is generally 2347 // insignificant, but does matter when the entity being initialized has a 2348 // class type. 2349 QualType DeclInitType = VDecl->getType(); 2350 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2351 DeclInitType = Array->getElementType(); 2352 2353 // FIXME: This isn't the right place to complete the type. 2354 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2355 diag::err_typecheck_decl_incomplete_type)) { 2356 VDecl->setInvalidDecl(); 2357 return; 2358 } 2359 2360 if (VDecl->getType()->isRecordType()) { 2361 CXXConstructorDecl *Constructor 2362 = PerformInitializationByConstructor(DeclInitType, 2363 (Expr **)Exprs.get(), NumExprs, 2364 VDecl->getLocation(), 2365 SourceRange(VDecl->getLocation(), 2366 RParenLoc), 2367 VDecl->getDeclName(), 2368 IK_Direct); 2369 if (!Constructor) 2370 RealDecl->setInvalidDecl(); 2371 else { 2372 VDecl->setCXXDirectInitializer(true); 2373 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2374 (Expr**)Exprs.release(), NumExprs); 2375 // FIXME. Must do all that is needed to destroy the object 2376 // on scope exit. For now, just mark the destructor as used. 2377 MarkDestructorReferenced(VDecl->getLocation(), DeclInitType); 2378 } 2379 return; 2380 } 2381 2382 if (NumExprs > 1) { 2383 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2384 << SourceRange(VDecl->getLocation(), RParenLoc); 2385 RealDecl->setInvalidDecl(); 2386 return; 2387 } 2388 2389 // Let clients know that initialization was done with a direct initializer. 2390 VDecl->setCXXDirectInitializer(true); 2391 2392 assert(NumExprs == 1 && "Expected 1 expression"); 2393 // Set the init expression, handles conversions. 2394 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2395 /*DirectInit=*/true); 2396} 2397 2398/// PerformInitializationByConstructor - Perform initialization by 2399/// constructor (C++ [dcl.init]p14), which may occur as part of 2400/// direct-initialization or copy-initialization. We are initializing 2401/// an object of type @p ClassType with the given arguments @p 2402/// Args. @p Loc is the location in the source code where the 2403/// initializer occurs (e.g., a declaration, member initializer, 2404/// functional cast, etc.) while @p Range covers the whole 2405/// initialization. @p InitEntity is the entity being initialized, 2406/// which may by the name of a declaration or a type. @p Kind is the 2407/// kind of initialization we're performing, which affects whether 2408/// explicit constructors will be considered. When successful, returns 2409/// the constructor that will be used to perform the initialization; 2410/// when the initialization fails, emits a diagnostic and returns 2411/// null. 2412CXXConstructorDecl * 2413Sema::PerformInitializationByConstructor(QualType ClassType, 2414 Expr **Args, unsigned NumArgs, 2415 SourceLocation Loc, SourceRange Range, 2416 DeclarationName InitEntity, 2417 InitializationKind Kind) { 2418 const RecordType *ClassRec = ClassType->getAsRecordType(); 2419 assert(ClassRec && "Can only initialize a class type here"); 2420 2421 // C++ [dcl.init]p14: 2422 // 2423 // If the initialization is direct-initialization, or if it is 2424 // copy-initialization where the cv-unqualified version of the 2425 // source type is the same class as, or a derived class of, the 2426 // class of the destination, constructors are considered. The 2427 // applicable constructors are enumerated (13.3.1.3), and the 2428 // best one is chosen through overload resolution (13.3). The 2429 // constructor so selected is called to initialize the object, 2430 // with the initializer expression(s) as its argument(s). If no 2431 // constructor applies, or the overload resolution is ambiguous, 2432 // the initialization is ill-formed. 2433 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2434 OverloadCandidateSet CandidateSet; 2435 2436 // Add constructors to the overload set. 2437 DeclarationName ConstructorName 2438 = Context.DeclarationNames.getCXXConstructorName( 2439 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2440 DeclContext::lookup_const_iterator Con, ConEnd; 2441 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2442 Con != ConEnd; ++Con) { 2443 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2444 if ((Kind == IK_Direct) || 2445 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2446 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2447 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2448 } 2449 2450 // FIXME: When we decide not to synthesize the implicitly-declared 2451 // constructors, we'll need to make them appear here. 2452 2453 OverloadCandidateSet::iterator Best; 2454 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2455 case OR_Success: 2456 // We found a constructor. Return it. 2457 return cast<CXXConstructorDecl>(Best->Function); 2458 2459 case OR_No_Viable_Function: 2460 if (InitEntity) 2461 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2462 << InitEntity << Range; 2463 else 2464 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2465 << ClassType << Range; 2466 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2467 return 0; 2468 2469 case OR_Ambiguous: 2470 if (InitEntity) 2471 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2472 else 2473 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2474 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2475 return 0; 2476 2477 case OR_Deleted: 2478 if (InitEntity) 2479 Diag(Loc, diag::err_ovl_deleted_init) 2480 << Best->Function->isDeleted() 2481 << InitEntity << Range; 2482 else 2483 Diag(Loc, diag::err_ovl_deleted_init) 2484 << Best->Function->isDeleted() 2485 << InitEntity << Range; 2486 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2487 return 0; 2488 } 2489 2490 return 0; 2491} 2492 2493/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2494/// determine whether they are reference-related, 2495/// reference-compatible, reference-compatible with added 2496/// qualification, or incompatible, for use in C++ initialization by 2497/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2498/// type, and the first type (T1) is the pointee type of the reference 2499/// type being initialized. 2500Sema::ReferenceCompareResult 2501Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2502 bool& DerivedToBase) { 2503 assert(!T1->isReferenceType() && 2504 "T1 must be the pointee type of the reference type"); 2505 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2506 2507 T1 = Context.getCanonicalType(T1); 2508 T2 = Context.getCanonicalType(T2); 2509 QualType UnqualT1 = T1.getUnqualifiedType(); 2510 QualType UnqualT2 = T2.getUnqualifiedType(); 2511 2512 // C++ [dcl.init.ref]p4: 2513 // Given types “cv1 T1” and “cv2 T2,” “cv1 T1” is 2514 // reference-related to “cv2 T2” if T1 is the same type as T2, or 2515 // T1 is a base class of T2. 2516 if (UnqualT1 == UnqualT2) 2517 DerivedToBase = false; 2518 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2519 DerivedToBase = true; 2520 else 2521 return Ref_Incompatible; 2522 2523 // At this point, we know that T1 and T2 are reference-related (at 2524 // least). 2525 2526 // C++ [dcl.init.ref]p4: 2527 // "cv1 T1” is reference-compatible with “cv2 T2” if T1 is 2528 // reference-related to T2 and cv1 is the same cv-qualification 2529 // as, or greater cv-qualification than, cv2. For purposes of 2530 // overload resolution, cases for which cv1 is greater 2531 // cv-qualification than cv2 are identified as 2532 // reference-compatible with added qualification (see 13.3.3.2). 2533 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2534 return Ref_Compatible; 2535 else if (T1.isMoreQualifiedThan(T2)) 2536 return Ref_Compatible_With_Added_Qualification; 2537 else 2538 return Ref_Related; 2539} 2540 2541/// CheckReferenceInit - Check the initialization of a reference 2542/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2543/// the initializer (either a simple initializer or an initializer 2544/// list), and DeclType is the type of the declaration. When ICS is 2545/// non-null, this routine will compute the implicit conversion 2546/// sequence according to C++ [over.ics.ref] and will not produce any 2547/// diagnostics; when ICS is null, it will emit diagnostics when any 2548/// errors are found. Either way, a return value of true indicates 2549/// that there was a failure, a return value of false indicates that 2550/// the reference initialization succeeded. 2551/// 2552/// When @p SuppressUserConversions, user-defined conversions are 2553/// suppressed. 2554/// When @p AllowExplicit, we also permit explicit user-defined 2555/// conversion functions. 2556/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2557bool 2558Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2559 ImplicitConversionSequence *ICS, 2560 bool SuppressUserConversions, 2561 bool AllowExplicit, bool ForceRValue) { 2562 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2563 2564 QualType T1 = DeclType->getAsReferenceType()->getPointeeType(); 2565 QualType T2 = Init->getType(); 2566 2567 // If the initializer is the address of an overloaded function, try 2568 // to resolve the overloaded function. If all goes well, T2 is the 2569 // type of the resulting function. 2570 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2571 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2572 ICS != 0); 2573 if (Fn) { 2574 // Since we're performing this reference-initialization for 2575 // real, update the initializer with the resulting function. 2576 if (!ICS) { 2577 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2578 return true; 2579 2580 FixOverloadedFunctionReference(Init, Fn); 2581 } 2582 2583 T2 = Fn->getType(); 2584 } 2585 } 2586 2587 // Compute some basic properties of the types and the initializer. 2588 bool isRValRef = DeclType->isRValueReferenceType(); 2589 bool DerivedToBase = false; 2590 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2591 Init->isLvalue(Context); 2592 ReferenceCompareResult RefRelationship 2593 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2594 2595 // Most paths end in a failed conversion. 2596 if (ICS) 2597 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2598 2599 // C++ [dcl.init.ref]p5: 2600 // A reference to type “cv1 T1” is initialized by an expression 2601 // of type “cv2 T2” as follows: 2602 2603 // -- If the initializer expression 2604 2605 // Rvalue references cannot bind to lvalues (N2812). 2606 // There is absolutely no situation where they can. In particular, note that 2607 // this is ill-formed, even if B has a user-defined conversion to A&&: 2608 // B b; 2609 // A&& r = b; 2610 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2611 if (!ICS) 2612 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2613 << Init->getSourceRange(); 2614 return true; 2615 } 2616 2617 bool BindsDirectly = false; 2618 // -- is an lvalue (but is not a bit-field), and “cv1 T1” is 2619 // reference-compatible with “cv2 T2,” or 2620 // 2621 // Note that the bit-field check is skipped if we are just computing 2622 // the implicit conversion sequence (C++ [over.best.ics]p2). 2623 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2624 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2625 BindsDirectly = true; 2626 2627 if (ICS) { 2628 // C++ [over.ics.ref]p1: 2629 // When a parameter of reference type binds directly (8.5.3) 2630 // to an argument expression, the implicit conversion sequence 2631 // is the identity conversion, unless the argument expression 2632 // has a type that is a derived class of the parameter type, 2633 // in which case the implicit conversion sequence is a 2634 // derived-to-base Conversion (13.3.3.1). 2635 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2636 ICS->Standard.First = ICK_Identity; 2637 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2638 ICS->Standard.Third = ICK_Identity; 2639 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2640 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2641 ICS->Standard.ReferenceBinding = true; 2642 ICS->Standard.DirectBinding = true; 2643 ICS->Standard.RRefBinding = false; 2644 ICS->Standard.CopyConstructor = 0; 2645 2646 // Nothing more to do: the inaccessibility/ambiguity check for 2647 // derived-to-base conversions is suppressed when we're 2648 // computing the implicit conversion sequence (C++ 2649 // [over.best.ics]p2). 2650 return false; 2651 } else { 2652 // Perform the conversion. 2653 // FIXME: Binding to a subobject of the lvalue is going to require more 2654 // AST annotation than this. 2655 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2656 } 2657 } 2658 2659 // -- has a class type (i.e., T2 is a class type) and can be 2660 // implicitly converted to an lvalue of type “cv3 T3,” 2661 // where “cv1 T1” is reference-compatible with “cv3 T3” 2662 // 92) (this conversion is selected by enumerating the 2663 // applicable conversion functions (13.3.1.6) and choosing 2664 // the best one through overload resolution (13.3)), 2665 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2666 // FIXME: Look for conversions in base classes! 2667 CXXRecordDecl *T2RecordDecl 2668 = dyn_cast<CXXRecordDecl>(T2->getAsRecordType()->getDecl()); 2669 2670 OverloadCandidateSet CandidateSet; 2671 OverloadedFunctionDecl *Conversions 2672 = T2RecordDecl->getConversionFunctions(); 2673 for (OverloadedFunctionDecl::function_iterator Func 2674 = Conversions->function_begin(); 2675 Func != Conversions->function_end(); ++Func) { 2676 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2677 2678 // If the conversion function doesn't return a reference type, 2679 // it can't be considered for this conversion. 2680 if (Conv->getConversionType()->isLValueReferenceType() && 2681 (AllowExplicit || !Conv->isExplicit())) 2682 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2683 } 2684 2685 OverloadCandidateSet::iterator Best; 2686 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2687 case OR_Success: 2688 // This is a direct binding. 2689 BindsDirectly = true; 2690 2691 if (ICS) { 2692 // C++ [over.ics.ref]p1: 2693 // 2694 // [...] If the parameter binds directly to the result of 2695 // applying a conversion function to the argument 2696 // expression, the implicit conversion sequence is a 2697 // user-defined conversion sequence (13.3.3.1.2), with the 2698 // second standard conversion sequence either an identity 2699 // conversion or, if the conversion function returns an 2700 // entity of a type that is a derived class of the parameter 2701 // type, a derived-to-base Conversion. 2702 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2703 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2704 ICS->UserDefined.After = Best->FinalConversion; 2705 ICS->UserDefined.ConversionFunction = Best->Function; 2706 assert(ICS->UserDefined.After.ReferenceBinding && 2707 ICS->UserDefined.After.DirectBinding && 2708 "Expected a direct reference binding!"); 2709 return false; 2710 } else { 2711 // Perform the conversion. 2712 // FIXME: Binding to a subobject of the lvalue is going to require more 2713 // AST annotation than this. 2714 ImpCastExprToType(Init, T1, /*isLvalue=*/true); 2715 } 2716 break; 2717 2718 case OR_Ambiguous: 2719 assert(false && "Ambiguous reference binding conversions not implemented."); 2720 return true; 2721 2722 case OR_No_Viable_Function: 2723 case OR_Deleted: 2724 // There was no suitable conversion, or we found a deleted 2725 // conversion; continue with other checks. 2726 break; 2727 } 2728 } 2729 2730 if (BindsDirectly) { 2731 // C++ [dcl.init.ref]p4: 2732 // [...] In all cases where the reference-related or 2733 // reference-compatible relationship of two types is used to 2734 // establish the validity of a reference binding, and T1 is a 2735 // base class of T2, a program that necessitates such a binding 2736 // is ill-formed if T1 is an inaccessible (clause 11) or 2737 // ambiguous (10.2) base class of T2. 2738 // 2739 // Note that we only check this condition when we're allowed to 2740 // complain about errors, because we should not be checking for 2741 // ambiguity (or inaccessibility) unless the reference binding 2742 // actually happens. 2743 if (DerivedToBase) 2744 return CheckDerivedToBaseConversion(T2, T1, 2745 Init->getSourceRange().getBegin(), 2746 Init->getSourceRange()); 2747 else 2748 return false; 2749 } 2750 2751 // -- Otherwise, the reference shall be to a non-volatile const 2752 // type (i.e., cv1 shall be const), or the reference shall be an 2753 // rvalue reference and the initializer expression shall be an rvalue. 2754 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2755 if (!ICS) 2756 Diag(Init->getSourceRange().getBegin(), 2757 diag::err_not_reference_to_const_init) 2758 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2759 << T2 << Init->getSourceRange(); 2760 return true; 2761 } 2762 2763 // -- If the initializer expression is an rvalue, with T2 a 2764 // class type, and “cv1 T1” is reference-compatible with 2765 // “cv2 T2,” the reference is bound in one of the 2766 // following ways (the choice is implementation-defined): 2767 // 2768 // -- The reference is bound to the object represented by 2769 // the rvalue (see 3.10) or to a sub-object within that 2770 // object. 2771 // 2772 // -- A temporary of type “cv1 T2” [sic] is created, and 2773 // a constructor is called to copy the entire rvalue 2774 // object into the temporary. The reference is bound to 2775 // the temporary or to a sub-object within the 2776 // temporary. 2777 // 2778 // The constructor that would be used to make the copy 2779 // shall be callable whether or not the copy is actually 2780 // done. 2781 // 2782 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2783 // freedom, so we will always take the first option and never build 2784 // a temporary in this case. FIXME: We will, however, have to check 2785 // for the presence of a copy constructor in C++98/03 mode. 2786 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2787 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2788 if (ICS) { 2789 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2790 ICS->Standard.First = ICK_Identity; 2791 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2792 ICS->Standard.Third = ICK_Identity; 2793 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2794 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2795 ICS->Standard.ReferenceBinding = true; 2796 ICS->Standard.DirectBinding = false; 2797 ICS->Standard.RRefBinding = isRValRef; 2798 ICS->Standard.CopyConstructor = 0; 2799 } else { 2800 // FIXME: Binding to a subobject of the rvalue is going to require more 2801 // AST annotation than this. 2802 ImpCastExprToType(Init, T1, /*isLvalue=*/false); 2803 } 2804 return false; 2805 } 2806 2807 // -- Otherwise, a temporary of type “cv1 T1” is created and 2808 // initialized from the initializer expression using the 2809 // rules for a non-reference copy initialization (8.5). The 2810 // reference is then bound to the temporary. If T1 is 2811 // reference-related to T2, cv1 must be the same 2812 // cv-qualification as, or greater cv-qualification than, 2813 // cv2; otherwise, the program is ill-formed. 2814 if (RefRelationship == Ref_Related) { 2815 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2816 // we would be reference-compatible or reference-compatible with 2817 // added qualification. But that wasn't the case, so the reference 2818 // initialization fails. 2819 if (!ICS) 2820 Diag(Init->getSourceRange().getBegin(), 2821 diag::err_reference_init_drops_quals) 2822 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2823 << T2 << Init->getSourceRange(); 2824 return true; 2825 } 2826 2827 // If at least one of the types is a class type, the types are not 2828 // related, and we aren't allowed any user conversions, the 2829 // reference binding fails. This case is important for breaking 2830 // recursion, since TryImplicitConversion below will attempt to 2831 // create a temporary through the use of a copy constructor. 2832 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2833 (T1->isRecordType() || T2->isRecordType())) { 2834 if (!ICS) 2835 Diag(Init->getSourceRange().getBegin(), 2836 diag::err_typecheck_convert_incompatible) 2837 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2838 return true; 2839 } 2840 2841 // Actually try to convert the initializer to T1. 2842 if (ICS) { 2843 // C++ [over.ics.ref]p2: 2844 // 2845 // When a parameter of reference type is not bound directly to 2846 // an argument expression, the conversion sequence is the one 2847 // required to convert the argument expression to the 2848 // underlying type of the reference according to 2849 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2850 // to copy-initializing a temporary of the underlying type with 2851 // the argument expression. Any difference in top-level 2852 // cv-qualification is subsumed by the initialization itself 2853 // and does not constitute a conversion. 2854 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2855 // Of course, that's still a reference binding. 2856 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2857 ICS->Standard.ReferenceBinding = true; 2858 ICS->Standard.RRefBinding = isRValRef; 2859 } else if(ICS->ConversionKind == 2860 ImplicitConversionSequence::UserDefinedConversion) { 2861 ICS->UserDefined.After.ReferenceBinding = true; 2862 ICS->UserDefined.After.RRefBinding = isRValRef; 2863 } 2864 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2865 } else { 2866 return PerformImplicitConversion(Init, T1, "initializing"); 2867 } 2868} 2869 2870/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2871/// of this overloaded operator is well-formed. If so, returns false; 2872/// otherwise, emits appropriate diagnostics and returns true. 2873bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2874 assert(FnDecl && FnDecl->isOverloadedOperator() && 2875 "Expected an overloaded operator declaration"); 2876 2877 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2878 2879 // C++ [over.oper]p5: 2880 // The allocation and deallocation functions, operator new, 2881 // operator new[], operator delete and operator delete[], are 2882 // described completely in 3.7.3. The attributes and restrictions 2883 // found in the rest of this subclause do not apply to them unless 2884 // explicitly stated in 3.7.3. 2885 // FIXME: Write a separate routine for checking this. For now, just allow it. 2886 if (Op == OO_New || Op == OO_Array_New || 2887 Op == OO_Delete || Op == OO_Array_Delete) 2888 return false; 2889 2890 // C++ [over.oper]p6: 2891 // An operator function shall either be a non-static member 2892 // function or be a non-member function and have at least one 2893 // parameter whose type is a class, a reference to a class, an 2894 // enumeration, or a reference to an enumeration. 2895 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 2896 if (MethodDecl->isStatic()) 2897 return Diag(FnDecl->getLocation(), 2898 diag::err_operator_overload_static) << FnDecl->getDeclName(); 2899 } else { 2900 bool ClassOrEnumParam = false; 2901 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 2902 ParamEnd = FnDecl->param_end(); 2903 Param != ParamEnd; ++Param) { 2904 QualType ParamType = (*Param)->getType().getNonReferenceType(); 2905 if (ParamType->isDependentType() || ParamType->isRecordType() || 2906 ParamType->isEnumeralType()) { 2907 ClassOrEnumParam = true; 2908 break; 2909 } 2910 } 2911 2912 if (!ClassOrEnumParam) 2913 return Diag(FnDecl->getLocation(), 2914 diag::err_operator_overload_needs_class_or_enum) 2915 << FnDecl->getDeclName(); 2916 } 2917 2918 // C++ [over.oper]p8: 2919 // An operator function cannot have default arguments (8.3.6), 2920 // except where explicitly stated below. 2921 // 2922 // Only the function-call operator allows default arguments 2923 // (C++ [over.call]p1). 2924 if (Op != OO_Call) { 2925 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 2926 Param != FnDecl->param_end(); ++Param) { 2927 if ((*Param)->hasUnparsedDefaultArg()) 2928 return Diag((*Param)->getLocation(), 2929 diag::err_operator_overload_default_arg) 2930 << FnDecl->getDeclName(); 2931 else if (Expr *DefArg = (*Param)->getDefaultArg()) 2932 return Diag((*Param)->getLocation(), 2933 diag::err_operator_overload_default_arg) 2934 << FnDecl->getDeclName() << DefArg->getSourceRange(); 2935 } 2936 } 2937 2938 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 2939 { false, false, false } 2940#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 2941 , { Unary, Binary, MemberOnly } 2942#include "clang/Basic/OperatorKinds.def" 2943 }; 2944 2945 bool CanBeUnaryOperator = OperatorUses[Op][0]; 2946 bool CanBeBinaryOperator = OperatorUses[Op][1]; 2947 bool MustBeMemberOperator = OperatorUses[Op][2]; 2948 2949 // C++ [over.oper]p8: 2950 // [...] Operator functions cannot have more or fewer parameters 2951 // than the number required for the corresponding operator, as 2952 // described in the rest of this subclause. 2953 unsigned NumParams = FnDecl->getNumParams() 2954 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 2955 if (Op != OO_Call && 2956 ((NumParams == 1 && !CanBeUnaryOperator) || 2957 (NumParams == 2 && !CanBeBinaryOperator) || 2958 (NumParams < 1) || (NumParams > 2))) { 2959 // We have the wrong number of parameters. 2960 unsigned ErrorKind; 2961 if (CanBeUnaryOperator && CanBeBinaryOperator) { 2962 ErrorKind = 2; // 2 -> unary or binary. 2963 } else if (CanBeUnaryOperator) { 2964 ErrorKind = 0; // 0 -> unary 2965 } else { 2966 assert(CanBeBinaryOperator && 2967 "All non-call overloaded operators are unary or binary!"); 2968 ErrorKind = 1; // 1 -> binary 2969 } 2970 2971 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 2972 << FnDecl->getDeclName() << NumParams << ErrorKind; 2973 } 2974 2975 // Overloaded operators other than operator() cannot be variadic. 2976 if (Op != OO_Call && 2977 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 2978 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 2979 << FnDecl->getDeclName(); 2980 } 2981 2982 // Some operators must be non-static member functions. 2983 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 2984 return Diag(FnDecl->getLocation(), 2985 diag::err_operator_overload_must_be_member) 2986 << FnDecl->getDeclName(); 2987 } 2988 2989 // C++ [over.inc]p1: 2990 // The user-defined function called operator++ implements the 2991 // prefix and postfix ++ operator. If this function is a member 2992 // function with no parameters, or a non-member function with one 2993 // parameter of class or enumeration type, it defines the prefix 2994 // increment operator ++ for objects of that type. If the function 2995 // is a member function with one parameter (which shall be of type 2996 // int) or a non-member function with two parameters (the second 2997 // of which shall be of type int), it defines the postfix 2998 // increment operator ++ for objects of that type. 2999 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3000 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3001 bool ParamIsInt = false; 3002 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3003 ParamIsInt = BT->getKind() == BuiltinType::Int; 3004 3005 if (!ParamIsInt) 3006 return Diag(LastParam->getLocation(), 3007 diag::err_operator_overload_post_incdec_must_be_int) 3008 << LastParam->getType() << (Op == OO_MinusMinus); 3009 } 3010 3011 // Notify the class if it got an assignment operator. 3012 if (Op == OO_Equal) { 3013 // Would have returned earlier otherwise. 3014 assert(isa<CXXMethodDecl>(FnDecl) && 3015 "Overloaded = not member, but not filtered."); 3016 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3017 Method->getParent()->addedAssignmentOperator(Context, Method); 3018 } 3019 3020 return false; 3021} 3022 3023/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3024/// linkage specification, including the language and (if present) 3025/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3026/// the location of the language string literal, which is provided 3027/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3028/// the '{' brace. Otherwise, this linkage specification does not 3029/// have any braces. 3030Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3031 SourceLocation ExternLoc, 3032 SourceLocation LangLoc, 3033 const char *Lang, 3034 unsigned StrSize, 3035 SourceLocation LBraceLoc) { 3036 LinkageSpecDecl::LanguageIDs Language; 3037 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3038 Language = LinkageSpecDecl::lang_c; 3039 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3040 Language = LinkageSpecDecl::lang_cxx; 3041 else { 3042 Diag(LangLoc, diag::err_bad_language); 3043 return DeclPtrTy(); 3044 } 3045 3046 // FIXME: Add all the various semantics of linkage specifications 3047 3048 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3049 LangLoc, Language, 3050 LBraceLoc.isValid()); 3051 CurContext->addDecl(D); 3052 PushDeclContext(S, D); 3053 return DeclPtrTy::make(D); 3054} 3055 3056/// ActOnFinishLinkageSpecification - Completely the definition of 3057/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3058/// valid, it's the position of the closing '}' brace in a linkage 3059/// specification that uses braces. 3060Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3061 DeclPtrTy LinkageSpec, 3062 SourceLocation RBraceLoc) { 3063 if (LinkageSpec) 3064 PopDeclContext(); 3065 return LinkageSpec; 3066} 3067 3068/// \brief Perform semantic analysis for the variable declaration that 3069/// occurs within a C++ catch clause, returning the newly-created 3070/// variable. 3071VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3072 IdentifierInfo *Name, 3073 SourceLocation Loc, 3074 SourceRange Range) { 3075 bool Invalid = false; 3076 3077 // Arrays and functions decay. 3078 if (ExDeclType->isArrayType()) 3079 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3080 else if (ExDeclType->isFunctionType()) 3081 ExDeclType = Context.getPointerType(ExDeclType); 3082 3083 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3084 // The exception-declaration shall not denote a pointer or reference to an 3085 // incomplete type, other than [cv] void*. 3086 // N2844 forbids rvalue references. 3087 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3088 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3089 Invalid = true; 3090 } 3091 3092 QualType BaseType = ExDeclType; 3093 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3094 unsigned DK = diag::err_catch_incomplete; 3095 if (const PointerType *Ptr = BaseType->getAsPointerType()) { 3096 BaseType = Ptr->getPointeeType(); 3097 Mode = 1; 3098 DK = diag::err_catch_incomplete_ptr; 3099 } else if(const ReferenceType *Ref = BaseType->getAsReferenceType()) { 3100 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3101 BaseType = Ref->getPointeeType(); 3102 Mode = 2; 3103 DK = diag::err_catch_incomplete_ref; 3104 } 3105 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3106 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3107 Invalid = true; 3108 3109 if (!Invalid && !ExDeclType->isDependentType() && 3110 RequireNonAbstractType(Loc, ExDeclType, 3111 diag::err_abstract_type_in_decl, 3112 AbstractVariableType)) 3113 Invalid = true; 3114 3115 // FIXME: Need to test for ability to copy-construct and destroy the 3116 // exception variable. 3117 3118 // FIXME: Need to check for abstract classes. 3119 3120 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3121 Name, ExDeclType, VarDecl::None, 3122 Range.getBegin()); 3123 3124 if (Invalid) 3125 ExDecl->setInvalidDecl(); 3126 3127 return ExDecl; 3128} 3129 3130/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3131/// handler. 3132Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3133 QualType ExDeclType = GetTypeForDeclarator(D, S); 3134 3135 bool Invalid = D.isInvalidType(); 3136 IdentifierInfo *II = D.getIdentifier(); 3137 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3138 // The scope should be freshly made just for us. There is just no way 3139 // it contains any previous declaration. 3140 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3141 if (PrevDecl->isTemplateParameter()) { 3142 // Maybe we will complain about the shadowed template parameter. 3143 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3144 } 3145 } 3146 3147 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3148 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3149 << D.getCXXScopeSpec().getRange(); 3150 Invalid = true; 3151 } 3152 3153 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3154 D.getIdentifier(), 3155 D.getIdentifierLoc(), 3156 D.getDeclSpec().getSourceRange()); 3157 3158 if (Invalid) 3159 ExDecl->setInvalidDecl(); 3160 3161 // Add the exception declaration into this scope. 3162 if (II) 3163 PushOnScopeChains(ExDecl, S); 3164 else 3165 CurContext->addDecl(ExDecl); 3166 3167 ProcessDeclAttributes(S, ExDecl, D); 3168 return DeclPtrTy::make(ExDecl); 3169} 3170 3171Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3172 ExprArg assertexpr, 3173 ExprArg assertmessageexpr) { 3174 Expr *AssertExpr = (Expr *)assertexpr.get(); 3175 StringLiteral *AssertMessage = 3176 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3177 3178 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3179 llvm::APSInt Value(32); 3180 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3181 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3182 AssertExpr->getSourceRange(); 3183 return DeclPtrTy(); 3184 } 3185 3186 if (Value == 0) { 3187 std::string str(AssertMessage->getStrData(), 3188 AssertMessage->getByteLength()); 3189 Diag(AssertLoc, diag::err_static_assert_failed) 3190 << str << AssertExpr->getSourceRange(); 3191 } 3192 } 3193 3194 assertexpr.release(); 3195 assertmessageexpr.release(); 3196 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3197 AssertExpr, AssertMessage); 3198 3199 CurContext->addDecl(Decl); 3200 return DeclPtrTy::make(Decl); 3201} 3202 3203bool Sema::ActOnFriendDecl(Scope *S, SourceLocation FriendLoc, DeclPtrTy Dcl) { 3204 if (!(S->getFlags() & Scope::ClassScope)) { 3205 Diag(FriendLoc, diag::err_friend_decl_outside_class); 3206 return true; 3207 } 3208 3209 return false; 3210} 3211 3212void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3213 Decl *Dcl = dcl.getAs<Decl>(); 3214 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3215 if (!Fn) { 3216 Diag(DelLoc, diag::err_deleted_non_function); 3217 return; 3218 } 3219 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3220 Diag(DelLoc, diag::err_deleted_decl_not_first); 3221 Diag(Prev->getLocation(), diag::note_previous_declaration); 3222 // If the declaration wasn't the first, we delete the function anyway for 3223 // recovery. 3224 } 3225 Fn->setDeleted(); 3226} 3227 3228static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3229 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3230 ++CI) { 3231 Stmt *SubStmt = *CI; 3232 if (!SubStmt) 3233 continue; 3234 if (isa<ReturnStmt>(SubStmt)) 3235 Self.Diag(SubStmt->getSourceRange().getBegin(), 3236 diag::err_return_in_constructor_handler); 3237 if (!isa<Expr>(SubStmt)) 3238 SearchForReturnInStmt(Self, SubStmt); 3239 } 3240} 3241 3242void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3243 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3244 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3245 SearchForReturnInStmt(*this, Handler); 3246 } 3247} 3248 3249bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3250 const CXXMethodDecl *Old) { 3251 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3252 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3253 3254 QualType CNewTy = Context.getCanonicalType(NewTy); 3255 QualType COldTy = Context.getCanonicalType(OldTy); 3256 3257 if (CNewTy == COldTy && 3258 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3259 return false; 3260 3261 // Check if the return types are covariant 3262 QualType NewClassTy, OldClassTy; 3263 3264 /// Both types must be pointers or references to classes. 3265 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3266 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3267 NewClassTy = NewPT->getPointeeType(); 3268 OldClassTy = OldPT->getPointeeType(); 3269 } 3270 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3271 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3272 NewClassTy = NewRT->getPointeeType(); 3273 OldClassTy = OldRT->getPointeeType(); 3274 } 3275 } 3276 3277 // The return types aren't either both pointers or references to a class type. 3278 if (NewClassTy.isNull()) { 3279 Diag(New->getLocation(), 3280 diag::err_different_return_type_for_overriding_virtual_function) 3281 << New->getDeclName() << NewTy << OldTy; 3282 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3283 3284 return true; 3285 } 3286 3287 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3288 // Check if the new class derives from the old class. 3289 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3290 Diag(New->getLocation(), 3291 diag::err_covariant_return_not_derived) 3292 << New->getDeclName() << NewTy << OldTy; 3293 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3294 return true; 3295 } 3296 3297 // Check if we the conversion from derived to base is valid. 3298 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3299 diag::err_covariant_return_inaccessible_base, 3300 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3301 // FIXME: Should this point to the return type? 3302 New->getLocation(), SourceRange(), New->getDeclName())) { 3303 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3304 return true; 3305 } 3306 } 3307 3308 // The qualifiers of the return types must be the same. 3309 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3310 Diag(New->getLocation(), 3311 diag::err_covariant_return_type_different_qualifications) 3312 << New->getDeclName() << NewTy << OldTy; 3313 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3314 return true; 3315 }; 3316 3317 3318 // The new class type must have the same or less qualifiers as the old type. 3319 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3320 Diag(New->getLocation(), 3321 diag::err_covariant_return_type_class_type_more_qualified) 3322 << New->getDeclName() << NewTy << OldTy; 3323 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3324 return true; 3325 }; 3326 3327 return false; 3328} 3329 3330bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3331 const CXXMethodDecl *Old) 3332{ 3333 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3334 diag::note_overridden_virtual_function, 3335 Old->getType()->getAsFunctionProtoType(), 3336 Old->getLocation(), 3337 New->getType()->getAsFunctionProtoType(), 3338 New->getLocation()); 3339} 3340 3341/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3342/// initializer for the declaration 'Dcl'. 3343/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3344/// static data member of class X, names should be looked up in the scope of 3345/// class X. 3346void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3347 Decl *D = Dcl.getAs<Decl>(); 3348 // If there is no declaration, there was an error parsing it. 3349 if (D == 0) 3350 return; 3351 3352 // Check whether it is a declaration with a nested name specifier like 3353 // int foo::bar; 3354 if (!D->isOutOfLine()) 3355 return; 3356 3357 // C++ [basic.lookup.unqual]p13 3358 // 3359 // A name used in the definition of a static data member of class X 3360 // (after the qualified-id of the static member) is looked up as if the name 3361 // was used in a member function of X. 3362 3363 // Change current context into the context of the initializing declaration. 3364 EnterDeclaratorContext(S, D->getDeclContext()); 3365} 3366 3367/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3368/// initializer for the declaration 'Dcl'. 3369void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3370 Decl *D = Dcl.getAs<Decl>(); 3371 // If there is no declaration, there was an error parsing it. 3372 if (D == 0) 3373 return; 3374 3375 // Check whether it is a declaration with a nested name specifier like 3376 // int foo::bar; 3377 if (!D->isOutOfLine()) 3378 return; 3379 3380 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3381 ExitDeclaratorContext(S); 3382} 3383