SemaDeclCXX.cpp revision c48fbdfb83a5e50fed693f0bdda3396e5b67051d
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->getAs<RecordType>()->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 assert(!DS.isFriendSpecified()); 554 555 // C++ 9.2p6: A member shall not be declared to have automatic storage 556 // duration (auto, register) or with the extern storage-class-specifier. 557 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 558 // data members and cannot be applied to names declared const or static, 559 // and cannot be applied to reference members. 560 switch (DS.getStorageClassSpec()) { 561 case DeclSpec::SCS_unspecified: 562 case DeclSpec::SCS_typedef: 563 case DeclSpec::SCS_static: 564 // FALL THROUGH. 565 break; 566 case DeclSpec::SCS_mutable: 567 if (isFunc) { 568 if (DS.getStorageClassSpecLoc().isValid()) 569 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 570 else 571 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 572 573 // FIXME: It would be nicer if the keyword was ignored only for this 574 // declarator. Otherwise we could get follow-up errors. 575 D.getMutableDeclSpec().ClearStorageClassSpecs(); 576 } else { 577 QualType T = GetTypeForDeclarator(D, S); 578 diag::kind err = static_cast<diag::kind>(0); 579 if (T->isReferenceType()) 580 err = diag::err_mutable_reference; 581 else if (T.isConstQualified()) 582 err = diag::err_mutable_const; 583 if (err != 0) { 584 if (DS.getStorageClassSpecLoc().isValid()) 585 Diag(DS.getStorageClassSpecLoc(), err); 586 else 587 Diag(DS.getThreadSpecLoc(), err); 588 // FIXME: It would be nicer if the keyword was ignored only for this 589 // declarator. Otherwise we could get follow-up errors. 590 D.getMutableDeclSpec().ClearStorageClassSpecs(); 591 } 592 } 593 break; 594 default: 595 if (DS.getStorageClassSpecLoc().isValid()) 596 Diag(DS.getStorageClassSpecLoc(), 597 diag::err_storageclass_invalid_for_member); 598 else 599 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 600 D.getMutableDeclSpec().ClearStorageClassSpecs(); 601 } 602 603 if (!isFunc && 604 D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_typename && 605 D.getNumTypeObjects() == 0) { 606 // Check also for this case: 607 // 608 // typedef int f(); 609 // f a; 610 // 611 QualType TDType = QualType::getFromOpaquePtr(DS.getTypeRep()); 612 isFunc = TDType->isFunctionType(); 613 } 614 615 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 616 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 617 !isFunc); 618 619 Decl *Member; 620 if (isInstField) { 621 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 622 AS); 623 assert(Member && "HandleField never returns null"); 624 } else { 625 Member = ActOnDeclarator(S, D).getAs<Decl>(); 626 if (!Member) { 627 if (BitWidth) DeleteExpr(BitWidth); 628 return DeclPtrTy(); 629 } 630 631 // Non-instance-fields can't have a bitfield. 632 if (BitWidth) { 633 if (Member->isInvalidDecl()) { 634 // don't emit another diagnostic. 635 } else if (isa<VarDecl>(Member)) { 636 // C++ 9.6p3: A bit-field shall not be a static member. 637 // "static member 'A' cannot be a bit-field" 638 Diag(Loc, diag::err_static_not_bitfield) 639 << Name << BitWidth->getSourceRange(); 640 } else if (isa<TypedefDecl>(Member)) { 641 // "typedef member 'x' cannot be a bit-field" 642 Diag(Loc, diag::err_typedef_not_bitfield) 643 << Name << BitWidth->getSourceRange(); 644 } else { 645 // A function typedef ("typedef int f(); f a;"). 646 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 647 Diag(Loc, diag::err_not_integral_type_bitfield) 648 << Name << cast<ValueDecl>(Member)->getType() 649 << BitWidth->getSourceRange(); 650 } 651 652 DeleteExpr(BitWidth); 653 BitWidth = 0; 654 Member->setInvalidDecl(); 655 } 656 657 Member->setAccess(AS); 658 } 659 660 assert((Name || isInstField) && "No identifier for non-field ?"); 661 662 if (Init) 663 AddInitializerToDecl(DeclPtrTy::make(Member), ExprArg(*this, Init), false); 664 if (Deleted) // FIXME: Source location is not very good. 665 SetDeclDeleted(DeclPtrTy::make(Member), D.getSourceRange().getBegin()); 666 667 if (isInstField) { 668 FieldCollector->Add(cast<FieldDecl>(Member)); 669 return DeclPtrTy(); 670 } 671 return DeclPtrTy::make(Member); 672} 673 674/// ActOnMemInitializer - Handle a C++ member initializer. 675Sema::MemInitResult 676Sema::ActOnMemInitializer(DeclPtrTy ConstructorD, 677 Scope *S, 678 const CXXScopeSpec &SS, 679 IdentifierInfo *MemberOrBase, 680 TypeTy *TemplateTypeTy, 681 SourceLocation IdLoc, 682 SourceLocation LParenLoc, 683 ExprTy **Args, unsigned NumArgs, 684 SourceLocation *CommaLocs, 685 SourceLocation RParenLoc) { 686 if (!ConstructorD) 687 return true; 688 689 CXXConstructorDecl *Constructor 690 = dyn_cast<CXXConstructorDecl>(ConstructorD.getAs<Decl>()); 691 if (!Constructor) { 692 // The user wrote a constructor initializer on a function that is 693 // not a C++ constructor. Ignore the error for now, because we may 694 // have more member initializers coming; we'll diagnose it just 695 // once in ActOnMemInitializers. 696 return true; 697 } 698 699 CXXRecordDecl *ClassDecl = Constructor->getParent(); 700 701 // C++ [class.base.init]p2: 702 // Names in a mem-initializer-id are looked up in the scope of the 703 // constructor’s class and, if not found in that scope, are looked 704 // up in the scope containing the constructor’s 705 // definition. [Note: if the constructor’s class contains a member 706 // with the same name as a direct or virtual base class of the 707 // class, a mem-initializer-id naming the member or base class and 708 // composed of a single identifier refers to the class member. A 709 // mem-initializer-id for the hidden base class may be specified 710 // using a qualified name. ] 711 if (!SS.getScopeRep() && !TemplateTypeTy) { 712 // Look for a member, first. 713 FieldDecl *Member = 0; 714 DeclContext::lookup_result Result 715 = ClassDecl->lookup(MemberOrBase); 716 if (Result.first != Result.second) 717 Member = dyn_cast<FieldDecl>(*Result.first); 718 719 // FIXME: Handle members of an anonymous union. 720 721 if (Member) 722 return BuildMemberInitializer(Member, (Expr**)Args, NumArgs, IdLoc, 723 RParenLoc); 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); 733 734 return BuildBaseInitializer(BaseType, (Expr **)Args, NumArgs, IdLoc, 735 RParenLoc, ClassDecl); 736} 737 738Sema::MemInitResult 739Sema::BuildMemberInitializer(FieldDecl *Member, Expr **Args, 740 unsigned NumArgs, SourceLocation IdLoc, 741 SourceLocation RParenLoc) { 742 bool HasDependentArg = false; 743 for (unsigned i = 0; i < NumArgs; i++) 744 HasDependentArg |= Args[i]->isTypeDependent(); 745 746 CXXConstructorDecl *C = 0; 747 QualType FieldType = Member->getType(); 748 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 749 FieldType = Array->getElementType(); 750 if (FieldType->isDependentType()) { 751 // Can't check init for dependent type. 752 } else if (FieldType->getAs<RecordType>()) { 753 if (!HasDependentArg) 754 C = PerformInitializationByConstructor( 755 FieldType, (Expr **)Args, NumArgs, IdLoc, 756 SourceRange(IdLoc, RParenLoc), Member->getDeclName(), IK_Direct); 757 } else if (NumArgs != 1) { 758 return Diag(IdLoc, diag::err_mem_initializer_mismatch) 759 << Member->getDeclName() << SourceRange(IdLoc, RParenLoc); 760 } else if (!HasDependentArg) { 761 Expr *NewExp = (Expr*)Args[0]; 762 if (PerformCopyInitialization(NewExp, FieldType, "passing")) 763 return true; 764 Args[0] = NewExp; 765 } 766 // FIXME: Perform direct initialization of the member. 767 return new (Context) CXXBaseOrMemberInitializer(Member, (Expr **)Args, 768 NumArgs, C, IdLoc); 769} 770 771Sema::MemInitResult 772Sema::BuildBaseInitializer(QualType BaseType, Expr **Args, 773 unsigned NumArgs, SourceLocation IdLoc, 774 SourceLocation RParenLoc, CXXRecordDecl *ClassDecl) { 775 bool HasDependentArg = false; 776 for (unsigned i = 0; i < NumArgs; i++) 777 HasDependentArg |= Args[i]->isTypeDependent(); 778 779 if (!BaseType->isDependentType()) { 780 if (!BaseType->isRecordType()) 781 return Diag(IdLoc, diag::err_base_init_does_not_name_class) 782 << BaseType << SourceRange(IdLoc, RParenLoc); 783 784 // C++ [class.base.init]p2: 785 // [...] Unless the mem-initializer-id names a nonstatic data 786 // member of the constructor’s class or a direct or virtual base 787 // of that class, the mem-initializer is ill-formed. A 788 // mem-initializer-list can initialize a base class using any 789 // name that denotes that base class type. 790 791 // First, check for a direct base class. 792 const CXXBaseSpecifier *DirectBaseSpec = 0; 793 for (CXXRecordDecl::base_class_const_iterator Base = 794 ClassDecl->bases_begin(); Base != ClassDecl->bases_end(); ++Base) { 795 if (Context.getCanonicalType(BaseType).getUnqualifiedType() == 796 Context.getCanonicalType(Base->getType()).getUnqualifiedType()) { 797 // We found a direct base of this type. That's what we're 798 // initializing. 799 DirectBaseSpec = &*Base; 800 break; 801 } 802 } 803 804 // Check for a virtual base class. 805 // FIXME: We might be able to short-circuit this if we know in advance that 806 // there are no virtual bases. 807 const CXXBaseSpecifier *VirtualBaseSpec = 0; 808 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 809 // We haven't found a base yet; search the class hierarchy for a 810 // virtual base class. 811 BasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 812 /*DetectVirtual=*/false); 813 if (IsDerivedFrom(Context.getTypeDeclType(ClassDecl), BaseType, Paths)) { 814 for (BasePaths::paths_iterator Path = Paths.begin(); 815 Path != Paths.end(); ++Path) { 816 if (Path->back().Base->isVirtual()) { 817 VirtualBaseSpec = Path->back().Base; 818 break; 819 } 820 } 821 } 822 } 823 824 // C++ [base.class.init]p2: 825 // If a mem-initializer-id is ambiguous because it designates both 826 // a direct non-virtual base class and an inherited virtual base 827 // class, the mem-initializer is ill-formed. 828 if (DirectBaseSpec && VirtualBaseSpec) 829 return Diag(IdLoc, diag::err_base_init_direct_and_virtual) 830 << BaseType << SourceRange(IdLoc, RParenLoc); 831 // C++ [base.class.init]p2: 832 // Unless the mem-initializer-id names a nonstatic data membeer of the 833 // constructor's class ot a direst or virtual base of that class, the 834 // mem-initializer is ill-formed. 835 if (!DirectBaseSpec && !VirtualBaseSpec) 836 return Diag(IdLoc, diag::err_not_direct_base_or_virtual) 837 << BaseType << ClassDecl->getNameAsCString() 838 << SourceRange(IdLoc, RParenLoc); 839 } 840 841 CXXConstructorDecl *C = 0; 842 if (!BaseType->isDependentType() && !HasDependentArg) { 843 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 844 Context.getCanonicalType(BaseType)); 845 C = PerformInitializationByConstructor(BaseType, (Expr **)Args, NumArgs, 846 IdLoc, SourceRange(IdLoc, RParenLoc), 847 Name, IK_Direct); 848 } 849 850 return new (Context) CXXBaseOrMemberInitializer(BaseType, (Expr **)Args, 851 NumArgs, C, IdLoc); 852} 853 854void 855Sema::BuildBaseOrMemberInitializers(ASTContext &C, 856 CXXConstructorDecl *Constructor, 857 CXXBaseOrMemberInitializer **Initializers, 858 unsigned NumInitializers 859 ) { 860 llvm::SmallVector<CXXBaseSpecifier *, 4>Bases; 861 llvm::SmallVector<FieldDecl *, 4>Members; 862 863 Constructor->setBaseOrMemberInitializers(C, 864 Initializers, NumInitializers, 865 Bases, Members); 866 for (unsigned int i = 0; i < Bases.size(); i++) 867 Diag(Bases[i]->getSourceRange().getBegin(), 868 diag::err_missing_default_constructor) << 0 << Bases[i]->getType(); 869 for (unsigned int i = 0; i < Members.size(); i++) 870 Diag(Members[i]->getLocation(), diag::err_missing_default_constructor) 871 << 1 << Members[i]->getType(); 872} 873 874static void *GetKeyForTopLevelField(FieldDecl *Field) { 875 // For anonymous unions, use the class declaration as the key. 876 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 877 if (RT->getDecl()->isAnonymousStructOrUnion()) 878 return static_cast<void *>(RT->getDecl()); 879 } 880 return static_cast<void *>(Field); 881} 882 883static void *GetKeyForMember(CXXBaseOrMemberInitializer *Member, 884 bool MemberMaybeAnon=false) { 885 // For fields injected into the class via declaration of an anonymous union, 886 // use its anonymous union class declaration as the unique key. 887 if (FieldDecl *Field = Member->getMember()) { 888 // After BuildBaseOrMemberInitializers call, Field is the anonymous union 889 // data member of the class. Data member used in the initializer list is 890 // in AnonUnionMember field. 891 if (MemberMaybeAnon && Field->isAnonymousStructOrUnion()) 892 Field = Member->getAnonUnionMember(); 893 if (Field->getDeclContext()->isRecord()) { 894 RecordDecl *RD = cast<RecordDecl>(Field->getDeclContext()); 895 if (RD->isAnonymousStructOrUnion()) 896 return static_cast<void *>(RD); 897 } 898 return static_cast<void *>(Field); 899 } 900 return static_cast<RecordType *>(Member->getBaseClass()); 901} 902 903void Sema::ActOnMemInitializers(DeclPtrTy ConstructorDecl, 904 SourceLocation ColonLoc, 905 MemInitTy **MemInits, unsigned NumMemInits) { 906 if (!ConstructorDecl) 907 return; 908 909 CXXConstructorDecl *Constructor 910 = dyn_cast<CXXConstructorDecl>(ConstructorDecl.getAs<Decl>()); 911 912 if (!Constructor) { 913 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 914 return; 915 } 916 llvm::DenseMap<void*, CXXBaseOrMemberInitializer *>Members; 917 bool err = false; 918 for (unsigned i = 0; i < NumMemInits; i++) { 919 CXXBaseOrMemberInitializer *Member = 920 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 921 void *KeyToMember = GetKeyForMember(Member); 922 CXXBaseOrMemberInitializer *&PrevMember = Members[KeyToMember]; 923 if (!PrevMember) { 924 PrevMember = Member; 925 continue; 926 } 927 if (FieldDecl *Field = Member->getMember()) 928 Diag(Member->getSourceLocation(), 929 diag::error_multiple_mem_initialization) 930 << Field->getNameAsString(); 931 else { 932 Type *BaseClass = Member->getBaseClass(); 933 assert(BaseClass && "ActOnMemInitializers - neither field or base"); 934 Diag(Member->getSourceLocation(), 935 diag::error_multiple_base_initialization) 936 << BaseClass->getDesugaredType(true); 937 } 938 Diag(PrevMember->getSourceLocation(), diag::note_previous_initializer) 939 << 0; 940 err = true; 941 } 942 if (!err) 943 BuildBaseOrMemberInitializers(Context, Constructor, 944 reinterpret_cast<CXXBaseOrMemberInitializer **>(MemInits), 945 NumMemInits); 946 947 if (!err && (Diags.getDiagnosticLevel(diag::warn_base_initialized) 948 != Diagnostic::Ignored || 949 Diags.getDiagnosticLevel(diag::warn_field_initialized) 950 != Diagnostic::Ignored)) { 951 // Also issue warning if order of ctor-initializer list does not match order 952 // of 1) base class declarations and 2) order of non-static data members. 953 llvm::SmallVector<const void*, 32> AllBaseOrMembers; 954 955 CXXRecordDecl *ClassDecl 956 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 957 // Push virtual bases before others. 958 for (CXXRecordDecl::base_class_iterator VBase = 959 ClassDecl->vbases_begin(), 960 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 961 AllBaseOrMembers.push_back(VBase->getType()->getAs<RecordType>()); 962 963 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 964 E = ClassDecl->bases_end(); Base != E; ++Base) { 965 // Virtuals are alread in the virtual base list and are constructed 966 // first. 967 if (Base->isVirtual()) 968 continue; 969 AllBaseOrMembers.push_back(Base->getType()->getAs<RecordType>()); 970 } 971 972 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 973 E = ClassDecl->field_end(); Field != E; ++Field) 974 AllBaseOrMembers.push_back(GetKeyForTopLevelField(*Field)); 975 976 int Last = AllBaseOrMembers.size(); 977 int curIndex = 0; 978 CXXBaseOrMemberInitializer *PrevMember = 0; 979 for (unsigned i = 0; i < NumMemInits; i++) { 980 CXXBaseOrMemberInitializer *Member = 981 static_cast<CXXBaseOrMemberInitializer*>(MemInits[i]); 982 void *MemberInCtorList = GetKeyForMember(Member, true); 983 984 for (; curIndex < Last; curIndex++) 985 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 986 break; 987 if (curIndex == Last) { 988 assert(PrevMember && "Member not in member list?!"); 989 // Initializer as specified in ctor-initializer list is out of order. 990 // Issue a warning diagnostic. 991 if (PrevMember->isBaseInitializer()) { 992 // Diagnostics is for an initialized base class. 993 Type *BaseClass = PrevMember->getBaseClass(); 994 Diag(PrevMember->getSourceLocation(), 995 diag::warn_base_initialized) 996 << BaseClass->getDesugaredType(true); 997 } else { 998 FieldDecl *Field = PrevMember->getMember(); 999 Diag(PrevMember->getSourceLocation(), 1000 diag::warn_field_initialized) 1001 << Field->getNameAsString(); 1002 } 1003 // Also the note! 1004 if (FieldDecl *Field = Member->getMember()) 1005 Diag(Member->getSourceLocation(), 1006 diag::note_fieldorbase_initialized_here) << 0 1007 << Field->getNameAsString(); 1008 else { 1009 Type *BaseClass = Member->getBaseClass(); 1010 Diag(Member->getSourceLocation(), 1011 diag::note_fieldorbase_initialized_here) << 1 1012 << BaseClass->getDesugaredType(true); 1013 } 1014 for (curIndex = 0; curIndex < Last; curIndex++) 1015 if (MemberInCtorList == AllBaseOrMembers[curIndex]) 1016 break; 1017 } 1018 PrevMember = Member; 1019 } 1020 } 1021} 1022 1023void Sema::ActOnDefaultCtorInitializers(DeclPtrTy CDtorDecl) { 1024 if (!CDtorDecl) 1025 return; 1026 1027 if (CXXConstructorDecl *Constructor 1028 = dyn_cast<CXXConstructorDecl>(CDtorDecl.getAs<Decl>())) 1029 BuildBaseOrMemberInitializers(Context, 1030 Constructor, 1031 (CXXBaseOrMemberInitializer **)0, 0); 1032} 1033 1034namespace { 1035 /// PureVirtualMethodCollector - traverses a class and its superclasses 1036 /// and determines if it has any pure virtual methods. 1037 class VISIBILITY_HIDDEN PureVirtualMethodCollector { 1038 ASTContext &Context; 1039 1040 public: 1041 typedef llvm::SmallVector<const CXXMethodDecl*, 8> MethodList; 1042 1043 private: 1044 MethodList Methods; 1045 1046 void Collect(const CXXRecordDecl* RD, MethodList& Methods); 1047 1048 public: 1049 PureVirtualMethodCollector(ASTContext &Ctx, const CXXRecordDecl* RD) 1050 : Context(Ctx) { 1051 1052 MethodList List; 1053 Collect(RD, List); 1054 1055 // Copy the temporary list to methods, and make sure to ignore any 1056 // null entries. 1057 for (size_t i = 0, e = List.size(); i != e; ++i) { 1058 if (List[i]) 1059 Methods.push_back(List[i]); 1060 } 1061 } 1062 1063 bool empty() const { return Methods.empty(); } 1064 1065 MethodList::const_iterator methods_begin() { return Methods.begin(); } 1066 MethodList::const_iterator methods_end() { return Methods.end(); } 1067 }; 1068 1069 void PureVirtualMethodCollector::Collect(const CXXRecordDecl* RD, 1070 MethodList& Methods) { 1071 // First, collect the pure virtual methods for the base classes. 1072 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 1073 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) { 1074 if (const RecordType *RT = Base->getType()->getAs<RecordType>()) { 1075 const CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(RT->getDecl()); 1076 if (BaseDecl && BaseDecl->isAbstract()) 1077 Collect(BaseDecl, Methods); 1078 } 1079 } 1080 1081 // Next, zero out any pure virtual methods that this class overrides. 1082 typedef llvm::SmallPtrSet<const CXXMethodDecl*, 4> MethodSetTy; 1083 1084 MethodSetTy OverriddenMethods; 1085 size_t MethodsSize = Methods.size(); 1086 1087 for (RecordDecl::decl_iterator i = RD->decls_begin(), e = RD->decls_end(); 1088 i != e; ++i) { 1089 // Traverse the record, looking for methods. 1090 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*i)) { 1091 // If the method is pure virtual, add it to the methods vector. 1092 if (MD->isPure()) { 1093 Methods.push_back(MD); 1094 continue; 1095 } 1096 1097 // Otherwise, record all the overridden methods in our set. 1098 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 1099 E = MD->end_overridden_methods(); I != E; ++I) { 1100 // Keep track of the overridden methods. 1101 OverriddenMethods.insert(*I); 1102 } 1103 } 1104 } 1105 1106 // Now go through the methods and zero out all the ones we know are 1107 // overridden. 1108 for (size_t i = 0, e = MethodsSize; i != e; ++i) { 1109 if (OverriddenMethods.count(Methods[i])) 1110 Methods[i] = 0; 1111 } 1112 1113 } 1114} 1115 1116bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 1117 unsigned DiagID, AbstractDiagSelID SelID, 1118 const CXXRecordDecl *CurrentRD) { 1119 1120 if (!getLangOptions().CPlusPlus) 1121 return false; 1122 1123 if (const ArrayType *AT = Context.getAsArrayType(T)) 1124 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1125 CurrentRD); 1126 1127 if (const PointerType *PT = T->getAs<PointerType>()) { 1128 // Find the innermost pointer type. 1129 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 1130 PT = T; 1131 1132 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 1133 return RequireNonAbstractType(Loc, AT->getElementType(), DiagID, SelID, 1134 CurrentRD); 1135 } 1136 1137 const RecordType *RT = T->getAs<RecordType>(); 1138 if (!RT) 1139 return false; 1140 1141 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 1142 if (!RD) 1143 return false; 1144 1145 if (CurrentRD && CurrentRD != RD) 1146 return false; 1147 1148 if (!RD->isAbstract()) 1149 return false; 1150 1151 Diag(Loc, DiagID) << RD->getDeclName() << SelID; 1152 1153 // Check if we've already emitted the list of pure virtual functions for this 1154 // class. 1155 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 1156 return true; 1157 1158 PureVirtualMethodCollector Collector(Context, RD); 1159 1160 for (PureVirtualMethodCollector::MethodList::const_iterator I = 1161 Collector.methods_begin(), E = Collector.methods_end(); I != E; ++I) { 1162 const CXXMethodDecl *MD = *I; 1163 1164 Diag(MD->getLocation(), diag::note_pure_virtual_function) << 1165 MD->getDeclName(); 1166 } 1167 1168 if (!PureVirtualClassDiagSet) 1169 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 1170 PureVirtualClassDiagSet->insert(RD); 1171 1172 return true; 1173} 1174 1175namespace { 1176 class VISIBILITY_HIDDEN AbstractClassUsageDiagnoser 1177 : public DeclVisitor<AbstractClassUsageDiagnoser, bool> { 1178 Sema &SemaRef; 1179 CXXRecordDecl *AbstractClass; 1180 1181 bool VisitDeclContext(const DeclContext *DC) { 1182 bool Invalid = false; 1183 1184 for (CXXRecordDecl::decl_iterator I = DC->decls_begin(), 1185 E = DC->decls_end(); I != E; ++I) 1186 Invalid |= Visit(*I); 1187 1188 return Invalid; 1189 } 1190 1191 public: 1192 AbstractClassUsageDiagnoser(Sema& SemaRef, CXXRecordDecl *ac) 1193 : SemaRef(SemaRef), AbstractClass(ac) { 1194 Visit(SemaRef.Context.getTranslationUnitDecl()); 1195 } 1196 1197 bool VisitFunctionDecl(const FunctionDecl *FD) { 1198 if (FD->isThisDeclarationADefinition()) { 1199 // No need to do the check if we're in a definition, because it requires 1200 // that the return/param types are complete. 1201 // because that requires 1202 return VisitDeclContext(FD); 1203 } 1204 1205 // Check the return type. 1206 QualType RTy = FD->getType()->getAsFunctionType()->getResultType(); 1207 bool Invalid = 1208 SemaRef.RequireNonAbstractType(FD->getLocation(), RTy, 1209 diag::err_abstract_type_in_decl, 1210 Sema::AbstractReturnType, 1211 AbstractClass); 1212 1213 for (FunctionDecl::param_const_iterator I = FD->param_begin(), 1214 E = FD->param_end(); I != E; ++I) { 1215 const ParmVarDecl *VD = *I; 1216 Invalid |= 1217 SemaRef.RequireNonAbstractType(VD->getLocation(), 1218 VD->getOriginalType(), 1219 diag::err_abstract_type_in_decl, 1220 Sema::AbstractParamType, 1221 AbstractClass); 1222 } 1223 1224 return Invalid; 1225 } 1226 1227 bool VisitDecl(const Decl* D) { 1228 if (const DeclContext *DC = dyn_cast<DeclContext>(D)) 1229 return VisitDeclContext(DC); 1230 1231 return false; 1232 } 1233 }; 1234} 1235 1236void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 1237 DeclPtrTy TagDecl, 1238 SourceLocation LBrac, 1239 SourceLocation RBrac) { 1240 if (!TagDecl) 1241 return; 1242 1243 AdjustDeclIfTemplate(TagDecl); 1244 ActOnFields(S, RLoc, TagDecl, 1245 (DeclPtrTy*)FieldCollector->getCurFields(), 1246 FieldCollector->getCurNumFields(), LBrac, RBrac, 0); 1247 1248 CXXRecordDecl *RD = cast<CXXRecordDecl>(TagDecl.getAs<Decl>()); 1249 if (!RD->isAbstract()) { 1250 // Collect all the pure virtual methods and see if this is an abstract 1251 // class after all. 1252 PureVirtualMethodCollector Collector(Context, RD); 1253 if (!Collector.empty()) 1254 RD->setAbstract(true); 1255 } 1256 1257 if (RD->isAbstract()) 1258 AbstractClassUsageDiagnoser(*this, RD); 1259 1260 if (!RD->isDependentType()) 1261 AddImplicitlyDeclaredMembersToClass(RD); 1262} 1263 1264/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 1265/// special functions, such as the default constructor, copy 1266/// constructor, or destructor, to the given C++ class (C++ 1267/// [special]p1). This routine can only be executed just before the 1268/// definition of the class is complete. 1269void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 1270 CanQualType ClassType 1271 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1272 1273 // FIXME: Implicit declarations have exception specifications, which are 1274 // the union of the specifications of the implicitly called functions. 1275 1276 if (!ClassDecl->hasUserDeclaredConstructor()) { 1277 // C++ [class.ctor]p5: 1278 // A default constructor for a class X is a constructor of class X 1279 // that can be called without an argument. If there is no 1280 // user-declared constructor for class X, a default constructor is 1281 // implicitly declared. An implicitly-declared default constructor 1282 // is an inline public member of its class. 1283 DeclarationName Name 1284 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1285 CXXConstructorDecl *DefaultCon = 1286 CXXConstructorDecl::Create(Context, ClassDecl, 1287 ClassDecl->getLocation(), Name, 1288 Context.getFunctionType(Context.VoidTy, 1289 0, 0, false, 0), 1290 /*isExplicit=*/false, 1291 /*isInline=*/true, 1292 /*isImplicitlyDeclared=*/true); 1293 DefaultCon->setAccess(AS_public); 1294 DefaultCon->setImplicit(); 1295 DefaultCon->setTrivial(ClassDecl->hasTrivialConstructor()); 1296 ClassDecl->addDecl(DefaultCon); 1297 } 1298 1299 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 1300 // C++ [class.copy]p4: 1301 // If the class definition does not explicitly declare a copy 1302 // constructor, one is declared implicitly. 1303 1304 // C++ [class.copy]p5: 1305 // The implicitly-declared copy constructor for a class X will 1306 // have the form 1307 // 1308 // X::X(const X&) 1309 // 1310 // if 1311 bool HasConstCopyConstructor = true; 1312 1313 // -- each direct or virtual base class B of X has a copy 1314 // constructor whose first parameter is of type const B& or 1315 // const volatile B&, and 1316 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1317 HasConstCopyConstructor && Base != ClassDecl->bases_end(); ++Base) { 1318 const CXXRecordDecl *BaseClassDecl 1319 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1320 HasConstCopyConstructor 1321 = BaseClassDecl->hasConstCopyConstructor(Context); 1322 } 1323 1324 // -- for all the nonstatic data members of X that are of a 1325 // class type M (or array thereof), each such class type 1326 // has a copy constructor whose first parameter is of type 1327 // const M& or const volatile M&. 1328 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1329 HasConstCopyConstructor && Field != ClassDecl->field_end(); 1330 ++Field) { 1331 QualType FieldType = (*Field)->getType(); 1332 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1333 FieldType = Array->getElementType(); 1334 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1335 const CXXRecordDecl *FieldClassDecl 1336 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1337 HasConstCopyConstructor 1338 = FieldClassDecl->hasConstCopyConstructor(Context); 1339 } 1340 } 1341 1342 // Otherwise, the implicitly declared copy constructor will have 1343 // the form 1344 // 1345 // X::X(X&) 1346 QualType ArgType = ClassType; 1347 if (HasConstCopyConstructor) 1348 ArgType = ArgType.withConst(); 1349 ArgType = Context.getLValueReferenceType(ArgType); 1350 1351 // An implicitly-declared copy constructor is an inline public 1352 // member of its class. 1353 DeclarationName Name 1354 = Context.DeclarationNames.getCXXConstructorName(ClassType); 1355 CXXConstructorDecl *CopyConstructor 1356 = CXXConstructorDecl::Create(Context, ClassDecl, 1357 ClassDecl->getLocation(), Name, 1358 Context.getFunctionType(Context.VoidTy, 1359 &ArgType, 1, 1360 false, 0), 1361 /*isExplicit=*/false, 1362 /*isInline=*/true, 1363 /*isImplicitlyDeclared=*/true); 1364 CopyConstructor->setAccess(AS_public); 1365 CopyConstructor->setImplicit(); 1366 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 1367 1368 // Add the parameter to the constructor. 1369 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 1370 ClassDecl->getLocation(), 1371 /*IdentifierInfo=*/0, 1372 ArgType, VarDecl::None, 0); 1373 CopyConstructor->setParams(Context, &FromParam, 1); 1374 ClassDecl->addDecl(CopyConstructor); 1375 } 1376 1377 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 1378 // Note: The following rules are largely analoguous to the copy 1379 // constructor rules. Note that virtual bases are not taken into account 1380 // for determining the argument type of the operator. Note also that 1381 // operators taking an object instead of a reference are allowed. 1382 // 1383 // C++ [class.copy]p10: 1384 // If the class definition does not explicitly declare a copy 1385 // assignment operator, one is declared implicitly. 1386 // The implicitly-defined copy assignment operator for a class X 1387 // will have the form 1388 // 1389 // X& X::operator=(const X&) 1390 // 1391 // if 1392 bool HasConstCopyAssignment = true; 1393 1394 // -- each direct base class B of X has a copy assignment operator 1395 // whose parameter is of type const B&, const volatile B& or B, 1396 // and 1397 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 1398 HasConstCopyAssignment && Base != ClassDecl->bases_end(); ++Base) { 1399 const CXXRecordDecl *BaseClassDecl 1400 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 1401 HasConstCopyAssignment = BaseClassDecl->hasConstCopyAssignment(Context); 1402 } 1403 1404 // -- for all the nonstatic data members of X that are of a class 1405 // type M (or array thereof), each such class type has a copy 1406 // assignment operator whose parameter is of type const M&, 1407 // const volatile M& or M. 1408 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(); 1409 HasConstCopyAssignment && Field != ClassDecl->field_end(); 1410 ++Field) { 1411 QualType FieldType = (*Field)->getType(); 1412 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 1413 FieldType = Array->getElementType(); 1414 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 1415 const CXXRecordDecl *FieldClassDecl 1416 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 1417 HasConstCopyAssignment 1418 = FieldClassDecl->hasConstCopyAssignment(Context); 1419 } 1420 } 1421 1422 // Otherwise, the implicitly declared copy assignment operator will 1423 // have the form 1424 // 1425 // X& X::operator=(X&) 1426 QualType ArgType = ClassType; 1427 QualType RetType = Context.getLValueReferenceType(ArgType); 1428 if (HasConstCopyAssignment) 1429 ArgType = ArgType.withConst(); 1430 ArgType = Context.getLValueReferenceType(ArgType); 1431 1432 // An implicitly-declared copy assignment operator is an inline public 1433 // member of its class. 1434 DeclarationName Name = 1435 Context.DeclarationNames.getCXXOperatorName(OO_Equal); 1436 CXXMethodDecl *CopyAssignment = 1437 CXXMethodDecl::Create(Context, ClassDecl, ClassDecl->getLocation(), Name, 1438 Context.getFunctionType(RetType, &ArgType, 1, 1439 false, 0), 1440 /*isStatic=*/false, /*isInline=*/true); 1441 CopyAssignment->setAccess(AS_public); 1442 CopyAssignment->setImplicit(); 1443 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 1444 1445 // Add the parameter to the operator. 1446 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 1447 ClassDecl->getLocation(), 1448 /*IdentifierInfo=*/0, 1449 ArgType, VarDecl::None, 0); 1450 CopyAssignment->setParams(Context, &FromParam, 1); 1451 1452 // Don't call addedAssignmentOperator. There is no way to distinguish an 1453 // implicit from an explicit assignment operator. 1454 ClassDecl->addDecl(CopyAssignment); 1455 } 1456 1457 if (!ClassDecl->hasUserDeclaredDestructor()) { 1458 // C++ [class.dtor]p2: 1459 // If a class has no user-declared destructor, a destructor is 1460 // declared implicitly. An implicitly-declared destructor is an 1461 // inline public member of its class. 1462 DeclarationName Name 1463 = Context.DeclarationNames.getCXXDestructorName(ClassType); 1464 CXXDestructorDecl *Destructor 1465 = CXXDestructorDecl::Create(Context, ClassDecl, 1466 ClassDecl->getLocation(), Name, 1467 Context.getFunctionType(Context.VoidTy, 1468 0, 0, false, 0), 1469 /*isInline=*/true, 1470 /*isImplicitlyDeclared=*/true); 1471 Destructor->setAccess(AS_public); 1472 Destructor->setImplicit(); 1473 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 1474 ClassDecl->addDecl(Destructor); 1475 } 1476} 1477 1478void Sema::ActOnReenterTemplateScope(Scope *S, DeclPtrTy TemplateD) { 1479 TemplateDecl *Template = TemplateD.getAs<TemplateDecl>(); 1480 if (!Template) 1481 return; 1482 1483 TemplateParameterList *Params = Template->getTemplateParameters(); 1484 for (TemplateParameterList::iterator Param = Params->begin(), 1485 ParamEnd = Params->end(); 1486 Param != ParamEnd; ++Param) { 1487 NamedDecl *Named = cast<NamedDecl>(*Param); 1488 if (Named->getDeclName()) { 1489 S->AddDecl(DeclPtrTy::make(Named)); 1490 IdResolver.AddDecl(Named); 1491 } 1492 } 1493} 1494 1495/// ActOnStartDelayedCXXMethodDeclaration - We have completed 1496/// parsing a top-level (non-nested) C++ class, and we are now 1497/// parsing those parts of the given Method declaration that could 1498/// not be parsed earlier (C++ [class.mem]p2), such as default 1499/// arguments. This action should enter the scope of the given 1500/// Method declaration as if we had just parsed the qualified method 1501/// name. However, it should not bring the parameters into scope; 1502/// that will be performed by ActOnDelayedCXXMethodParameter. 1503void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1504 if (!MethodD) 1505 return; 1506 1507 CXXScopeSpec SS; 1508 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1509 QualType ClassTy 1510 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1511 SS.setScopeRep( 1512 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1513 ActOnCXXEnterDeclaratorScope(S, SS); 1514} 1515 1516/// ActOnDelayedCXXMethodParameter - We've already started a delayed 1517/// C++ method declaration. We're (re-)introducing the given 1518/// function parameter into scope for use in parsing later parts of 1519/// the method declaration. For example, we could see an 1520/// ActOnParamDefaultArgument event for this parameter. 1521void Sema::ActOnDelayedCXXMethodParameter(Scope *S, DeclPtrTy ParamD) { 1522 if (!ParamD) 1523 return; 1524 1525 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD.getAs<Decl>()); 1526 1527 // If this parameter has an unparsed default argument, clear it out 1528 // to make way for the parsed default argument. 1529 if (Param->hasUnparsedDefaultArg()) 1530 Param->setDefaultArg(0); 1531 1532 S->AddDecl(DeclPtrTy::make(Param)); 1533 if (Param->getDeclName()) 1534 IdResolver.AddDecl(Param); 1535} 1536 1537/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 1538/// processing the delayed method declaration for Method. The method 1539/// declaration is now considered finished. There may be a separate 1540/// ActOnStartOfFunctionDef action later (not necessarily 1541/// immediately!) for this method, if it was also defined inside the 1542/// class body. 1543void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, DeclPtrTy MethodD) { 1544 if (!MethodD) 1545 return; 1546 1547 FunctionDecl *Method = cast<FunctionDecl>(MethodD.getAs<Decl>()); 1548 CXXScopeSpec SS; 1549 QualType ClassTy 1550 = Context.getTypeDeclType(cast<RecordDecl>(Method->getDeclContext())); 1551 SS.setScopeRep( 1552 NestedNameSpecifier::Create(Context, 0, false, ClassTy.getTypePtr())); 1553 ActOnCXXExitDeclaratorScope(S, SS); 1554 1555 // Now that we have our default arguments, check the constructor 1556 // again. It could produce additional diagnostics or affect whether 1557 // the class has implicitly-declared destructors, among other 1558 // things. 1559 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 1560 CheckConstructor(Constructor); 1561 1562 // Check the default arguments, which we may have added. 1563 if (!Method->isInvalidDecl()) 1564 CheckCXXDefaultArguments(Method); 1565} 1566 1567/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 1568/// the well-formedness of the constructor declarator @p D with type @p 1569/// R. If there are any errors in the declarator, this routine will 1570/// emit diagnostics and set the invalid bit to true. In any case, the type 1571/// will be updated to reflect a well-formed type for the constructor and 1572/// returned. 1573QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 1574 FunctionDecl::StorageClass &SC) { 1575 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1576 1577 // C++ [class.ctor]p3: 1578 // A constructor shall not be virtual (10.3) or static (9.4). A 1579 // constructor can be invoked for a const, volatile or const 1580 // volatile object. A constructor shall not be declared const, 1581 // volatile, or const volatile (9.3.2). 1582 if (isVirtual) { 1583 if (!D.isInvalidType()) 1584 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1585 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 1586 << SourceRange(D.getIdentifierLoc()); 1587 D.setInvalidType(); 1588 } 1589 if (SC == FunctionDecl::Static) { 1590 if (!D.isInvalidType()) 1591 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 1592 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1593 << SourceRange(D.getIdentifierLoc()); 1594 D.setInvalidType(); 1595 SC = FunctionDecl::None; 1596 } 1597 1598 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1599 if (FTI.TypeQuals != 0) { 1600 if (FTI.TypeQuals & QualType::Const) 1601 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1602 << "const" << SourceRange(D.getIdentifierLoc()); 1603 if (FTI.TypeQuals & QualType::Volatile) 1604 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1605 << "volatile" << SourceRange(D.getIdentifierLoc()); 1606 if (FTI.TypeQuals & QualType::Restrict) 1607 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 1608 << "restrict" << SourceRange(D.getIdentifierLoc()); 1609 } 1610 1611 // Rebuild the function type "R" without any type qualifiers (in 1612 // case any of the errors above fired) and with "void" as the 1613 // return type, since constructors don't have return types. We 1614 // *always* have to do this, because GetTypeForDeclarator will 1615 // put in a result type of "int" when none was specified. 1616 const FunctionProtoType *Proto = R->getAsFunctionProtoType(); 1617 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 1618 Proto->getNumArgs(), 1619 Proto->isVariadic(), 0); 1620} 1621 1622/// CheckConstructor - Checks a fully-formed constructor for 1623/// well-formedness, issuing any diagnostics required. Returns true if 1624/// the constructor declarator is invalid. 1625void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 1626 CXXRecordDecl *ClassDecl 1627 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 1628 if (!ClassDecl) 1629 return Constructor->setInvalidDecl(); 1630 1631 // C++ [class.copy]p3: 1632 // A declaration of a constructor for a class X is ill-formed if 1633 // its first parameter is of type (optionally cv-qualified) X and 1634 // either there are no other parameters or else all other 1635 // parameters have default arguments. 1636 if (!Constructor->isInvalidDecl() && 1637 ((Constructor->getNumParams() == 1) || 1638 (Constructor->getNumParams() > 1 && 1639 Constructor->getParamDecl(1)->hasDefaultArg()))) { 1640 QualType ParamType = Constructor->getParamDecl(0)->getType(); 1641 QualType ClassTy = Context.getTagDeclType(ClassDecl); 1642 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 1643 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 1644 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 1645 << CodeModificationHint::CreateInsertion(ParamLoc, " const &"); 1646 Constructor->setInvalidDecl(); 1647 } 1648 } 1649 1650 // Notify the class that we've added a constructor. 1651 ClassDecl->addedConstructor(Context, Constructor); 1652} 1653 1654static inline bool 1655FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 1656 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1657 FTI.ArgInfo[0].Param && 1658 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()); 1659} 1660 1661/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 1662/// the well-formednes of the destructor declarator @p D with type @p 1663/// R. If there are any errors in the declarator, this routine will 1664/// emit diagnostics and set the declarator to invalid. Even if this happens, 1665/// will be updated to reflect a well-formed type for the destructor and 1666/// returned. 1667QualType Sema::CheckDestructorDeclarator(Declarator &D, 1668 FunctionDecl::StorageClass& SC) { 1669 // C++ [class.dtor]p1: 1670 // [...] A typedef-name that names a class is a class-name 1671 // (7.1.3); however, a typedef-name that names a class shall not 1672 // be used as the identifier in the declarator for a destructor 1673 // declaration. 1674 QualType DeclaratorType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1675 if (isa<TypedefType>(DeclaratorType)) { 1676 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 1677 << DeclaratorType; 1678 D.setInvalidType(); 1679 } 1680 1681 // C++ [class.dtor]p2: 1682 // A destructor is used to destroy objects of its class type. A 1683 // destructor takes no parameters, and no return type can be 1684 // specified for it (not even void). The address of a destructor 1685 // shall not be taken. A destructor shall not be static. A 1686 // destructor can be invoked for a const, volatile or const 1687 // volatile object. A destructor shall not be declared const, 1688 // volatile or const volatile (9.3.2). 1689 if (SC == FunctionDecl::Static) { 1690 if (!D.isInvalidType()) 1691 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 1692 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1693 << SourceRange(D.getIdentifierLoc()); 1694 SC = FunctionDecl::None; 1695 D.setInvalidType(); 1696 } 1697 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1698 // Destructors don't have return types, but the parser will 1699 // happily parse something like: 1700 // 1701 // class X { 1702 // float ~X(); 1703 // }; 1704 // 1705 // The return type will be eliminated later. 1706 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 1707 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1708 << SourceRange(D.getIdentifierLoc()); 1709 } 1710 1711 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1712 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 1713 if (FTI.TypeQuals & QualType::Const) 1714 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1715 << "const" << SourceRange(D.getIdentifierLoc()); 1716 if (FTI.TypeQuals & QualType::Volatile) 1717 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1718 << "volatile" << SourceRange(D.getIdentifierLoc()); 1719 if (FTI.TypeQuals & QualType::Restrict) 1720 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 1721 << "restrict" << SourceRange(D.getIdentifierLoc()); 1722 D.setInvalidType(); 1723 } 1724 1725 // Make sure we don't have any parameters. 1726 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 1727 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 1728 1729 // Delete the parameters. 1730 FTI.freeArgs(); 1731 D.setInvalidType(); 1732 } 1733 1734 // Make sure the destructor isn't variadic. 1735 if (FTI.isVariadic) { 1736 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 1737 D.setInvalidType(); 1738 } 1739 1740 // Rebuild the function type "R" without any type qualifiers or 1741 // parameters (in case any of the errors above fired) and with 1742 // "void" as the return type, since destructors don't have return 1743 // types. We *always* have to do this, because GetTypeForDeclarator 1744 // will put in a result type of "int" when none was specified. 1745 return Context.getFunctionType(Context.VoidTy, 0, 0, false, 0); 1746} 1747 1748/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 1749/// well-formednes of the conversion function declarator @p D with 1750/// type @p R. If there are any errors in the declarator, this routine 1751/// will emit diagnostics and return true. Otherwise, it will return 1752/// false. Either way, the type @p R will be updated to reflect a 1753/// well-formed type for the conversion operator. 1754void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 1755 FunctionDecl::StorageClass& SC) { 1756 // C++ [class.conv.fct]p1: 1757 // Neither parameter types nor return type can be specified. The 1758 // type of a conversion function (8.3.5) is "function taking no 1759 // parameter returning conversion-type-id." 1760 if (SC == FunctionDecl::Static) { 1761 if (!D.isInvalidType()) 1762 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 1763 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 1764 << SourceRange(D.getIdentifierLoc()); 1765 D.setInvalidType(); 1766 SC = FunctionDecl::None; 1767 } 1768 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 1769 // Conversion functions don't have return types, but the parser will 1770 // happily parse something like: 1771 // 1772 // class X { 1773 // float operator bool(); 1774 // }; 1775 // 1776 // The return type will be changed later anyway. 1777 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 1778 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 1779 << SourceRange(D.getIdentifierLoc()); 1780 } 1781 1782 // Make sure we don't have any parameters. 1783 if (R->getAsFunctionProtoType()->getNumArgs() > 0) { 1784 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 1785 1786 // Delete the parameters. 1787 D.getTypeObject(0).Fun.freeArgs(); 1788 D.setInvalidType(); 1789 } 1790 1791 // Make sure the conversion function isn't variadic. 1792 if (R->getAsFunctionProtoType()->isVariadic() && !D.isInvalidType()) { 1793 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 1794 D.setInvalidType(); 1795 } 1796 1797 // C++ [class.conv.fct]p4: 1798 // The conversion-type-id shall not represent a function type nor 1799 // an array type. 1800 QualType ConvType = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1801 if (ConvType->isArrayType()) { 1802 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 1803 ConvType = Context.getPointerType(ConvType); 1804 D.setInvalidType(); 1805 } else if (ConvType->isFunctionType()) { 1806 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 1807 ConvType = Context.getPointerType(ConvType); 1808 D.setInvalidType(); 1809 } 1810 1811 // Rebuild the function type "R" without any parameters (in case any 1812 // of the errors above fired) and with the conversion type as the 1813 // return type. 1814 R = Context.getFunctionType(ConvType, 0, 0, false, 1815 R->getAsFunctionProtoType()->getTypeQuals()); 1816 1817 // C++0x explicit conversion operators. 1818 if (D.getDeclSpec().isExplicitSpecified() && !getLangOptions().CPlusPlus0x) 1819 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1820 diag::warn_explicit_conversion_functions) 1821 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 1822} 1823 1824/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 1825/// the declaration of the given C++ conversion function. This routine 1826/// is responsible for recording the conversion function in the C++ 1827/// class, if possible. 1828Sema::DeclPtrTy Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 1829 assert(Conversion && "Expected to receive a conversion function declaration"); 1830 1831 // Set the lexical context of this conversion function 1832 Conversion->setLexicalDeclContext(CurContext); 1833 1834 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 1835 1836 // Make sure we aren't redeclaring the conversion function. 1837 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 1838 1839 // C++ [class.conv.fct]p1: 1840 // [...] A conversion function is never used to convert a 1841 // (possibly cv-qualified) object to the (possibly cv-qualified) 1842 // same object type (or a reference to it), to a (possibly 1843 // cv-qualified) base class of that type (or a reference to it), 1844 // or to (possibly cv-qualified) void. 1845 // FIXME: Suppress this warning if the conversion function ends up being a 1846 // virtual function that overrides a virtual function in a base class. 1847 QualType ClassType 1848 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 1849 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 1850 ConvType = ConvTypeRef->getPointeeType(); 1851 if (ConvType->isRecordType()) { 1852 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 1853 if (ConvType == ClassType) 1854 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 1855 << ClassType; 1856 else if (IsDerivedFrom(ClassType, ConvType)) 1857 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 1858 << ClassType << ConvType; 1859 } else if (ConvType->isVoidType()) { 1860 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 1861 << ClassType << ConvType; 1862 } 1863 1864 if (Conversion->getPreviousDeclaration()) { 1865 OverloadedFunctionDecl *Conversions = ClassDecl->getConversionFunctions(); 1866 for (OverloadedFunctionDecl::function_iterator 1867 Conv = Conversions->function_begin(), 1868 ConvEnd = Conversions->function_end(); 1869 Conv != ConvEnd; ++Conv) { 1870 if (*Conv 1871 == cast_or_null<NamedDecl>(Conversion->getPreviousDeclaration())) { 1872 *Conv = Conversion; 1873 return DeclPtrTy::make(Conversion); 1874 } 1875 } 1876 assert(Conversion->isInvalidDecl() && "Conversion should not get here."); 1877 } else 1878 ClassDecl->addConversionFunction(Context, Conversion); 1879 1880 return DeclPtrTy::make(Conversion); 1881} 1882 1883//===----------------------------------------------------------------------===// 1884// Namespace Handling 1885//===----------------------------------------------------------------------===// 1886 1887/// ActOnStartNamespaceDef - This is called at the start of a namespace 1888/// definition. 1889Sema::DeclPtrTy Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 1890 SourceLocation IdentLoc, 1891 IdentifierInfo *II, 1892 SourceLocation LBrace) { 1893 NamespaceDecl *Namespc = 1894 NamespaceDecl::Create(Context, CurContext, IdentLoc, II); 1895 Namespc->setLBracLoc(LBrace); 1896 1897 Scope *DeclRegionScope = NamespcScope->getParent(); 1898 1899 if (II) { 1900 // C++ [namespace.def]p2: 1901 // The identifier in an original-namespace-definition shall not have been 1902 // previously defined in the declarative region in which the 1903 // original-namespace-definition appears. The identifier in an 1904 // original-namespace-definition is the name of the namespace. Subsequently 1905 // in that declarative region, it is treated as an original-namespace-name. 1906 1907 NamedDecl *PrevDecl = LookupName(DeclRegionScope, II, LookupOrdinaryName, 1908 true); 1909 1910 if (NamespaceDecl *OrigNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl)) { 1911 // This is an extended namespace definition. 1912 // Attach this namespace decl to the chain of extended namespace 1913 // definitions. 1914 OrigNS->setNextNamespace(Namespc); 1915 Namespc->setOriginalNamespace(OrigNS->getOriginalNamespace()); 1916 1917 // Remove the previous declaration from the scope. 1918 if (DeclRegionScope->isDeclScope(DeclPtrTy::make(OrigNS))) { 1919 IdResolver.RemoveDecl(OrigNS); 1920 DeclRegionScope->RemoveDecl(DeclPtrTy::make(OrigNS)); 1921 } 1922 } else if (PrevDecl) { 1923 // This is an invalid name redefinition. 1924 Diag(Namespc->getLocation(), diag::err_redefinition_different_kind) 1925 << Namespc->getDeclName(); 1926 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1927 Namespc->setInvalidDecl(); 1928 // Continue on to push Namespc as current DeclContext and return it. 1929 } 1930 1931 PushOnScopeChains(Namespc, DeclRegionScope); 1932 } else { 1933 // FIXME: Handle anonymous namespaces 1934 } 1935 1936 // Although we could have an invalid decl (i.e. the namespace name is a 1937 // redefinition), push it as current DeclContext and try to continue parsing. 1938 // FIXME: We should be able to push Namespc here, so that the each DeclContext 1939 // for the namespace has the declarations that showed up in that particular 1940 // namespace definition. 1941 PushDeclContext(NamespcScope, Namespc); 1942 return DeclPtrTy::make(Namespc); 1943} 1944 1945/// ActOnFinishNamespaceDef - This callback is called after a namespace is 1946/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 1947void Sema::ActOnFinishNamespaceDef(DeclPtrTy D, SourceLocation RBrace) { 1948 Decl *Dcl = D.getAs<Decl>(); 1949 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 1950 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 1951 Namespc->setRBracLoc(RBrace); 1952 PopDeclContext(); 1953} 1954 1955Sema::DeclPtrTy Sema::ActOnUsingDirective(Scope *S, 1956 SourceLocation UsingLoc, 1957 SourceLocation NamespcLoc, 1958 const CXXScopeSpec &SS, 1959 SourceLocation IdentLoc, 1960 IdentifierInfo *NamespcName, 1961 AttributeList *AttrList) { 1962 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 1963 assert(NamespcName && "Invalid NamespcName."); 1964 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 1965 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 1966 1967 UsingDirectiveDecl *UDir = 0; 1968 1969 // Lookup namespace name. 1970 LookupResult R = LookupParsedName(S, &SS, NamespcName, 1971 LookupNamespaceName, false); 1972 if (R.isAmbiguous()) { 1973 DiagnoseAmbiguousLookup(R, NamespcName, IdentLoc); 1974 return DeclPtrTy(); 1975 } 1976 if (NamedDecl *NS = R) { 1977 assert(isa<NamespaceDecl>(NS) && "expected namespace decl"); 1978 // C++ [namespace.udir]p1: 1979 // A using-directive specifies that the names in the nominated 1980 // namespace can be used in the scope in which the 1981 // using-directive appears after the using-directive. During 1982 // unqualified name lookup (3.4.1), the names appear as if they 1983 // were declared in the nearest enclosing namespace which 1984 // contains both the using-directive and the nominated 1985 // namespace. [Note: in this context, "contains" means "contains 1986 // directly or indirectly". ] 1987 1988 // Find enclosing context containing both using-directive and 1989 // nominated namespace. 1990 DeclContext *CommonAncestor = cast<DeclContext>(NS); 1991 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 1992 CommonAncestor = CommonAncestor->getParent(); 1993 1994 UDir = UsingDirectiveDecl::Create(Context, 1995 CurContext, UsingLoc, 1996 NamespcLoc, 1997 SS.getRange(), 1998 (NestedNameSpecifier *)SS.getScopeRep(), 1999 IdentLoc, 2000 cast<NamespaceDecl>(NS), 2001 CommonAncestor); 2002 PushUsingDirective(S, UDir); 2003 } else { 2004 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 2005 } 2006 2007 // FIXME: We ignore attributes for now. 2008 delete AttrList; 2009 return DeclPtrTy::make(UDir); 2010} 2011 2012void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 2013 // If scope has associated entity, then using directive is at namespace 2014 // or translation unit scope. We add UsingDirectiveDecls, into 2015 // it's lookup structure. 2016 if (DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity())) 2017 Ctx->addDecl(UDir); 2018 else 2019 // Otherwise it is block-sope. using-directives will affect lookup 2020 // only to the end of scope. 2021 S->PushUsingDirective(DeclPtrTy::make(UDir)); 2022} 2023 2024 2025Sema::DeclPtrTy Sema::ActOnUsingDeclaration(Scope *S, 2026 SourceLocation UsingLoc, 2027 const CXXScopeSpec &SS, 2028 SourceLocation IdentLoc, 2029 IdentifierInfo *TargetName, 2030 OverloadedOperatorKind Op, 2031 AttributeList *AttrList, 2032 bool IsTypeName) { 2033 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 2034 assert((TargetName || Op) && "Invalid TargetName."); 2035 assert(IdentLoc.isValid() && "Invalid TargetName location."); 2036 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 2037 2038 UsingDecl *UsingAlias = 0; 2039 2040 DeclarationName Name; 2041 if (TargetName) 2042 Name = TargetName; 2043 else 2044 Name = Context.DeclarationNames.getCXXOperatorName(Op); 2045 2046 // Lookup target name. 2047 LookupResult R = LookupParsedName(S, &SS, Name, LookupOrdinaryName, false); 2048 2049 if (NamedDecl *NS = R) { 2050 if (IsTypeName && !isa<TypeDecl>(NS)) { 2051 Diag(IdentLoc, diag::err_using_typename_non_type); 2052 } 2053 UsingAlias = UsingDecl::Create(Context, CurContext, IdentLoc, SS.getRange(), 2054 NS->getLocation(), UsingLoc, NS, 2055 static_cast<NestedNameSpecifier *>(SS.getScopeRep()), 2056 IsTypeName); 2057 PushOnScopeChains(UsingAlias, S); 2058 } else { 2059 Diag(IdentLoc, diag::err_using_requires_qualname) << SS.getRange(); 2060 } 2061 2062 // FIXME: We ignore attributes for now. 2063 delete AttrList; 2064 return DeclPtrTy::make(UsingAlias); 2065} 2066 2067/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 2068/// is a namespace alias, returns the namespace it points to. 2069static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 2070 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 2071 return AD->getNamespace(); 2072 return dyn_cast_or_null<NamespaceDecl>(D); 2073} 2074 2075Sema::DeclPtrTy Sema::ActOnNamespaceAliasDef(Scope *S, 2076 SourceLocation NamespaceLoc, 2077 SourceLocation AliasLoc, 2078 IdentifierInfo *Alias, 2079 const CXXScopeSpec &SS, 2080 SourceLocation IdentLoc, 2081 IdentifierInfo *Ident) { 2082 2083 // Lookup the namespace name. 2084 LookupResult R = LookupParsedName(S, &SS, Ident, LookupNamespaceName, false); 2085 2086 // Check if we have a previous declaration with the same name. 2087 if (NamedDecl *PrevDecl = LookupName(S, Alias, LookupOrdinaryName, true)) { 2088 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 2089 // We already have an alias with the same name that points to the same 2090 // namespace, so don't create a new one. 2091 if (!R.isAmbiguous() && AD->getNamespace() == getNamespaceDecl(R)) 2092 return DeclPtrTy(); 2093 } 2094 2095 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 2096 diag::err_redefinition_different_kind; 2097 Diag(AliasLoc, DiagID) << Alias; 2098 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2099 return DeclPtrTy(); 2100 } 2101 2102 if (R.isAmbiguous()) { 2103 DiagnoseAmbiguousLookup(R, Ident, IdentLoc); 2104 return DeclPtrTy(); 2105 } 2106 2107 if (!R) { 2108 Diag(NamespaceLoc, diag::err_expected_namespace_name) << SS.getRange(); 2109 return DeclPtrTy(); 2110 } 2111 2112 NamespaceAliasDecl *AliasDecl = 2113 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 2114 Alias, SS.getRange(), 2115 (NestedNameSpecifier *)SS.getScopeRep(), 2116 IdentLoc, R); 2117 2118 CurContext->addDecl(AliasDecl); 2119 return DeclPtrTy::make(AliasDecl); 2120} 2121 2122void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 2123 CXXConstructorDecl *Constructor) { 2124 assert((Constructor->isImplicit() && Constructor->isDefaultConstructor() && 2125 !Constructor->isUsed()) && 2126 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 2127 2128 CXXRecordDecl *ClassDecl 2129 = cast<CXXRecordDecl>(Constructor->getDeclContext()); 2130 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 2131 // Before the implicitly-declared default constructor for a class is 2132 // implicitly defined, all the implicitly-declared default constructors 2133 // for its base class and its non-static data members shall have been 2134 // implicitly defined. 2135 bool err = false; 2136 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2137 E = ClassDecl->bases_end(); Base != E; ++Base) { 2138 CXXRecordDecl *BaseClassDecl 2139 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2140 if (!BaseClassDecl->hasTrivialConstructor()) { 2141 if (CXXConstructorDecl *BaseCtor = 2142 BaseClassDecl->getDefaultConstructor(Context)) 2143 MarkDeclarationReferenced(CurrentLocation, BaseCtor); 2144 else { 2145 Diag(CurrentLocation, diag::err_defining_default_ctor) 2146 << Context.getTagDeclType(ClassDecl) << 1 2147 << Context.getTagDeclType(BaseClassDecl); 2148 Diag(BaseClassDecl->getLocation(), diag::note_previous_class_decl) 2149 << Context.getTagDeclType(BaseClassDecl); 2150 err = true; 2151 } 2152 } 2153 } 2154 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2155 E = ClassDecl->field_end(); Field != E; ++Field) { 2156 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2157 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2158 FieldType = Array->getElementType(); 2159 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2160 CXXRecordDecl *FieldClassDecl 2161 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2162 if (!FieldClassDecl->hasTrivialConstructor()) { 2163 if (CXXConstructorDecl *FieldCtor = 2164 FieldClassDecl->getDefaultConstructor(Context)) 2165 MarkDeclarationReferenced(CurrentLocation, FieldCtor); 2166 else { 2167 Diag(CurrentLocation, diag::err_defining_default_ctor) 2168 << Context.getTagDeclType(ClassDecl) << 0 << 2169 Context.getTagDeclType(FieldClassDecl); 2170 Diag(FieldClassDecl->getLocation(), diag::note_previous_class_decl) 2171 << Context.getTagDeclType(FieldClassDecl); 2172 err = true; 2173 } 2174 } 2175 } else if (FieldType->isReferenceType()) { 2176 Diag(CurrentLocation, diag::err_unintialized_member) 2177 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2178 Diag((*Field)->getLocation(), diag::note_declared_at); 2179 err = true; 2180 } else if (FieldType.isConstQualified()) { 2181 Diag(CurrentLocation, diag::err_unintialized_member) 2182 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2183 Diag((*Field)->getLocation(), diag::note_declared_at); 2184 err = true; 2185 } 2186 } 2187 if (!err) 2188 Constructor->setUsed(); 2189 else 2190 Constructor->setInvalidDecl(); 2191} 2192 2193void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 2194 CXXDestructorDecl *Destructor) { 2195 assert((Destructor->isImplicit() && !Destructor->isUsed()) && 2196 "DefineImplicitDestructor - call it for implicit default dtor"); 2197 2198 CXXRecordDecl *ClassDecl 2199 = cast<CXXRecordDecl>(Destructor->getDeclContext()); 2200 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 2201 // C++ [class.dtor] p5 2202 // Before the implicitly-declared default destructor for a class is 2203 // implicitly defined, all the implicitly-declared default destructors 2204 // for its base class and its non-static data members shall have been 2205 // implicitly defined. 2206 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2207 E = ClassDecl->bases_end(); Base != E; ++Base) { 2208 CXXRecordDecl *BaseClassDecl 2209 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2210 if (!BaseClassDecl->hasTrivialDestructor()) { 2211 if (CXXDestructorDecl *BaseDtor = 2212 const_cast<CXXDestructorDecl*>(BaseClassDecl->getDestructor(Context))) 2213 MarkDeclarationReferenced(CurrentLocation, BaseDtor); 2214 else 2215 assert(false && 2216 "DefineImplicitDestructor - missing dtor in a base class"); 2217 } 2218 } 2219 2220 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2221 E = ClassDecl->field_end(); Field != E; ++Field) { 2222 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2223 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2224 FieldType = Array->getElementType(); 2225 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2226 CXXRecordDecl *FieldClassDecl 2227 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2228 if (!FieldClassDecl->hasTrivialDestructor()) { 2229 if (CXXDestructorDecl *FieldDtor = 2230 const_cast<CXXDestructorDecl*>( 2231 FieldClassDecl->getDestructor(Context))) 2232 MarkDeclarationReferenced(CurrentLocation, FieldDtor); 2233 else 2234 assert(false && 2235 "DefineImplicitDestructor - missing dtor in class of a data member"); 2236 } 2237 } 2238 } 2239 Destructor->setUsed(); 2240} 2241 2242void Sema::DefineImplicitOverloadedAssign(SourceLocation CurrentLocation, 2243 CXXMethodDecl *MethodDecl) { 2244 assert((MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() && 2245 MethodDecl->getOverloadedOperator() == OO_Equal && 2246 !MethodDecl->isUsed()) && 2247 "DefineImplicitOverloadedAssign - call it for implicit assignment op"); 2248 2249 CXXRecordDecl *ClassDecl 2250 = cast<CXXRecordDecl>(MethodDecl->getDeclContext()); 2251 2252 // C++[class.copy] p12 2253 // Before the implicitly-declared copy assignment operator for a class is 2254 // implicitly defined, all implicitly-declared copy assignment operators 2255 // for its direct base classes and its nonstatic data members shall have 2256 // been implicitly defined. 2257 bool err = false; 2258 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 2259 E = ClassDecl->bases_end(); Base != E; ++Base) { 2260 CXXRecordDecl *BaseClassDecl 2261 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2262 if (CXXMethodDecl *BaseAssignOpMethod = 2263 getAssignOperatorMethod(MethodDecl->getParamDecl(0), BaseClassDecl)) 2264 MarkDeclarationReferenced(CurrentLocation, BaseAssignOpMethod); 2265 } 2266 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2267 E = ClassDecl->field_end(); Field != E; ++Field) { 2268 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2269 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2270 FieldType = Array->getElementType(); 2271 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2272 CXXRecordDecl *FieldClassDecl 2273 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2274 if (CXXMethodDecl *FieldAssignOpMethod = 2275 getAssignOperatorMethod(MethodDecl->getParamDecl(0), FieldClassDecl)) 2276 MarkDeclarationReferenced(CurrentLocation, FieldAssignOpMethod); 2277 } else if (FieldType->isReferenceType()) { 2278 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2279 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 2280 Diag(Field->getLocation(), diag::note_declared_at); 2281 Diag(CurrentLocation, diag::note_first_required_here); 2282 err = true; 2283 } else if (FieldType.isConstQualified()) { 2284 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 2285 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 2286 Diag(Field->getLocation(), diag::note_declared_at); 2287 Diag(CurrentLocation, diag::note_first_required_here); 2288 err = true; 2289 } 2290 } 2291 if (!err) 2292 MethodDecl->setUsed(); 2293} 2294 2295CXXMethodDecl * 2296Sema::getAssignOperatorMethod(ParmVarDecl *ParmDecl, 2297 CXXRecordDecl *ClassDecl) { 2298 QualType LHSType = Context.getTypeDeclType(ClassDecl); 2299 QualType RHSType(LHSType); 2300 // If class's assignment operator argument is const/volatile qualified, 2301 // look for operator = (const/volatile B&). Otherwise, look for 2302 // operator = (B&). 2303 if (ParmDecl->getType().isConstQualified()) 2304 RHSType.addConst(); 2305 if (ParmDecl->getType().isVolatileQualified()) 2306 RHSType.addVolatile(); 2307 ExprOwningPtr<Expr> LHS(this, new (Context) DeclRefExpr(ParmDecl, 2308 LHSType, 2309 SourceLocation())); 2310 ExprOwningPtr<Expr> RHS(this, new (Context) DeclRefExpr(ParmDecl, 2311 RHSType, 2312 SourceLocation())); 2313 Expr *Args[2] = { &*LHS, &*RHS }; 2314 OverloadCandidateSet CandidateSet; 2315 AddMemberOperatorCandidates(clang::OO_Equal, SourceLocation(), Args, 2, 2316 CandidateSet); 2317 OverloadCandidateSet::iterator Best; 2318 if (BestViableFunction(CandidateSet, 2319 ClassDecl->getLocation(), Best) == OR_Success) 2320 return cast<CXXMethodDecl>(Best->Function); 2321 assert(false && 2322 "getAssignOperatorMethod - copy assignment operator method not found"); 2323 return 0; 2324} 2325 2326void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 2327 CXXConstructorDecl *CopyConstructor, 2328 unsigned TypeQuals) { 2329 assert((CopyConstructor->isImplicit() && 2330 CopyConstructor->isCopyConstructor(Context, TypeQuals) && 2331 !CopyConstructor->isUsed()) && 2332 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 2333 2334 CXXRecordDecl *ClassDecl 2335 = cast<CXXRecordDecl>(CopyConstructor->getDeclContext()); 2336 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 2337 // C++ [class.copy] p209 2338 // Before the implicitly-declared copy constructor for a class is 2339 // implicitly defined, all the implicitly-declared copy constructors 2340 // for its base class and its non-static data members shall have been 2341 // implicitly defined. 2342 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(); 2343 Base != ClassDecl->bases_end(); ++Base) { 2344 CXXRecordDecl *BaseClassDecl 2345 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 2346 if (CXXConstructorDecl *BaseCopyCtor = 2347 BaseClassDecl->getCopyConstructor(Context, TypeQuals)) 2348 MarkDeclarationReferenced(CurrentLocation, BaseCopyCtor); 2349 } 2350 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 2351 FieldEnd = ClassDecl->field_end(); 2352 Field != FieldEnd; ++Field) { 2353 QualType FieldType = Context.getCanonicalType((*Field)->getType()); 2354 if (const ArrayType *Array = Context.getAsArrayType(FieldType)) 2355 FieldType = Array->getElementType(); 2356 if (const RecordType *FieldClassType = FieldType->getAs<RecordType>()) { 2357 CXXRecordDecl *FieldClassDecl 2358 = cast<CXXRecordDecl>(FieldClassType->getDecl()); 2359 if (CXXConstructorDecl *FieldCopyCtor = 2360 FieldClassDecl->getCopyConstructor(Context, TypeQuals)) 2361 MarkDeclarationReferenced(CurrentLocation, FieldCopyCtor); 2362 } 2363 } 2364 CopyConstructor->setUsed(); 2365} 2366 2367/// BuildCXXConstructExpr - Creates a complete call to a constructor, 2368/// including handling of its default argument expressions. 2369Expr *Sema::BuildCXXConstructExpr(ASTContext &C, 2370 QualType DeclInitType, 2371 CXXConstructorDecl *Constructor, 2372 bool Elidable, 2373 Expr **Exprs, unsigned NumExprs) { 2374 CXXConstructExpr *Temp = CXXConstructExpr::Create(C, DeclInitType, 2375 Constructor, 2376 Elidable, Exprs, NumExprs); 2377 // default arguments must be added to constructor call expression. 2378 FunctionDecl *FDecl = cast<FunctionDecl>(Constructor); 2379 unsigned NumArgsInProto = FDecl->param_size(); 2380 for (unsigned j = NumExprs; j != NumArgsInProto; j++) { 2381 Expr *DefaultExpr = FDecl->getParamDecl(j)->getDefaultArg(); 2382 2383 // If the default expression creates temporaries, we need to 2384 // push them to the current stack of expression temporaries so they'll 2385 // be properly destroyed. 2386 if (CXXExprWithTemporaries *E 2387 = dyn_cast_or_null<CXXExprWithTemporaries>(DefaultExpr)) { 2388 assert(!E->shouldDestroyTemporaries() && 2389 "Can't destroy temporaries in a default argument expr!"); 2390 for (unsigned I = 0, N = E->getNumTemporaries(); I != N; ++I) 2391 ExprTemporaries.push_back(E->getTemporary(I)); 2392 } 2393 Expr *Arg = new (C) CXXDefaultArgExpr(FDecl->getParamDecl(j)); 2394 Temp->setArg(j, Arg); 2395 } 2396 return Temp; 2397} 2398 2399void Sema::InitializeVarWithConstructor(VarDecl *VD, 2400 CXXConstructorDecl *Constructor, 2401 QualType DeclInitType, 2402 Expr **Exprs, unsigned NumExprs) { 2403 Expr *Temp = BuildCXXConstructExpr(Context, 2404 DeclInitType, Constructor, 2405 false, Exprs, NumExprs); 2406 MarkDeclarationReferenced(VD->getLocation(), Constructor); 2407 Temp = MaybeCreateCXXExprWithTemporaries(Temp, /*DestroyTemps=*/true); 2408 VD->setInit(Context, Temp); 2409} 2410 2411void Sema::FinalizeVarWithDestructor(VarDecl *VD, QualType DeclInitType) 2412{ 2413 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>( 2414 DeclInitType->getAs<RecordType>()->getDecl()); 2415 if (!ClassDecl->hasTrivialDestructor()) 2416 if (CXXDestructorDecl *Destructor = 2417 const_cast<CXXDestructorDecl*>(ClassDecl->getDestructor(Context))) 2418 MarkDeclarationReferenced(VD->getLocation(), Destructor); 2419} 2420 2421/// AddCXXDirectInitializerToDecl - This action is called immediately after 2422/// ActOnDeclarator, when a C++ direct initializer is present. 2423/// e.g: "int x(1);" 2424void Sema::AddCXXDirectInitializerToDecl(DeclPtrTy Dcl, 2425 SourceLocation LParenLoc, 2426 MultiExprArg Exprs, 2427 SourceLocation *CommaLocs, 2428 SourceLocation RParenLoc) { 2429 unsigned NumExprs = Exprs.size(); 2430 assert(NumExprs != 0 && Exprs.get() && "missing expressions"); 2431 Decl *RealDecl = Dcl.getAs<Decl>(); 2432 2433 // If there is no declaration, there was an error parsing it. Just ignore 2434 // the initializer. 2435 if (RealDecl == 0) 2436 return; 2437 2438 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2439 if (!VDecl) { 2440 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2441 RealDecl->setInvalidDecl(); 2442 return; 2443 } 2444 2445 // FIXME: Need to handle dependent types and expressions here. 2446 2447 // We will treat direct-initialization as a copy-initialization: 2448 // int x(1); -as-> int x = 1; 2449 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c); 2450 // 2451 // Clients that want to distinguish between the two forms, can check for 2452 // direct initializer using VarDecl::hasCXXDirectInitializer(). 2453 // A major benefit is that clients that don't particularly care about which 2454 // exactly form was it (like the CodeGen) can handle both cases without 2455 // special case code. 2456 2457 // C++ 8.5p11: 2458 // The form of initialization (using parentheses or '=') is generally 2459 // insignificant, but does matter when the entity being initialized has a 2460 // class type. 2461 QualType DeclInitType = VDecl->getType(); 2462 if (const ArrayType *Array = Context.getAsArrayType(DeclInitType)) 2463 DeclInitType = Array->getElementType(); 2464 2465 // FIXME: This isn't the right place to complete the type. 2466 if (RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2467 diag::err_typecheck_decl_incomplete_type)) { 2468 VDecl->setInvalidDecl(); 2469 return; 2470 } 2471 2472 if (VDecl->getType()->isRecordType()) { 2473 CXXConstructorDecl *Constructor 2474 = PerformInitializationByConstructor(DeclInitType, 2475 (Expr **)Exprs.get(), NumExprs, 2476 VDecl->getLocation(), 2477 SourceRange(VDecl->getLocation(), 2478 RParenLoc), 2479 VDecl->getDeclName(), 2480 IK_Direct); 2481 if (!Constructor) 2482 RealDecl->setInvalidDecl(); 2483 else { 2484 VDecl->setCXXDirectInitializer(true); 2485 InitializeVarWithConstructor(VDecl, Constructor, DeclInitType, 2486 (Expr**)Exprs.release(), NumExprs); 2487 FinalizeVarWithDestructor(VDecl, DeclInitType); 2488 } 2489 return; 2490 } 2491 2492 if (NumExprs > 1) { 2493 Diag(CommaLocs[0], diag::err_builtin_direct_init_more_than_one_arg) 2494 << SourceRange(VDecl->getLocation(), RParenLoc); 2495 RealDecl->setInvalidDecl(); 2496 return; 2497 } 2498 2499 // Let clients know that initialization was done with a direct initializer. 2500 VDecl->setCXXDirectInitializer(true); 2501 2502 assert(NumExprs == 1 && "Expected 1 expression"); 2503 // Set the init expression, handles conversions. 2504 AddInitializerToDecl(Dcl, ExprArg(*this, Exprs.release()[0]), 2505 /*DirectInit=*/true); 2506} 2507 2508/// PerformInitializationByConstructor - Perform initialization by 2509/// constructor (C++ [dcl.init]p14), which may occur as part of 2510/// direct-initialization or copy-initialization. We are initializing 2511/// an object of type @p ClassType with the given arguments @p 2512/// Args. @p Loc is the location in the source code where the 2513/// initializer occurs (e.g., a declaration, member initializer, 2514/// functional cast, etc.) while @p Range covers the whole 2515/// initialization. @p InitEntity is the entity being initialized, 2516/// which may by the name of a declaration or a type. @p Kind is the 2517/// kind of initialization we're performing, which affects whether 2518/// explicit constructors will be considered. When successful, returns 2519/// the constructor that will be used to perform the initialization; 2520/// when the initialization fails, emits a diagnostic and returns 2521/// null. 2522CXXConstructorDecl * 2523Sema::PerformInitializationByConstructor(QualType ClassType, 2524 Expr **Args, unsigned NumArgs, 2525 SourceLocation Loc, SourceRange Range, 2526 DeclarationName InitEntity, 2527 InitializationKind Kind) { 2528 const RecordType *ClassRec = ClassType->getAs<RecordType>(); 2529 assert(ClassRec && "Can only initialize a class type here"); 2530 2531 // C++ [dcl.init]p14: 2532 // 2533 // If the initialization is direct-initialization, or if it is 2534 // copy-initialization where the cv-unqualified version of the 2535 // source type is the same class as, or a derived class of, the 2536 // class of the destination, constructors are considered. The 2537 // applicable constructors are enumerated (13.3.1.3), and the 2538 // best one is chosen through overload resolution (13.3). The 2539 // constructor so selected is called to initialize the object, 2540 // with the initializer expression(s) as its argument(s). If no 2541 // constructor applies, or the overload resolution is ambiguous, 2542 // the initialization is ill-formed. 2543 const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(ClassRec->getDecl()); 2544 OverloadCandidateSet CandidateSet; 2545 2546 // Add constructors to the overload set. 2547 DeclarationName ConstructorName 2548 = Context.DeclarationNames.getCXXConstructorName( 2549 Context.getCanonicalType(ClassType.getUnqualifiedType())); 2550 DeclContext::lookup_const_iterator Con, ConEnd; 2551 for (llvm::tie(Con, ConEnd) = ClassDecl->lookup(ConstructorName); 2552 Con != ConEnd; ++Con) { 2553 CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(*Con); 2554 if ((Kind == IK_Direct) || 2555 (Kind == IK_Copy && Constructor->isConvertingConstructor()) || 2556 (Kind == IK_Default && Constructor->isDefaultConstructor())) 2557 AddOverloadCandidate(Constructor, Args, NumArgs, CandidateSet); 2558 } 2559 2560 // FIXME: When we decide not to synthesize the implicitly-declared 2561 // constructors, we'll need to make them appear here. 2562 2563 OverloadCandidateSet::iterator Best; 2564 switch (BestViableFunction(CandidateSet, Loc, Best)) { 2565 case OR_Success: 2566 // We found a constructor. Return it. 2567 return cast<CXXConstructorDecl>(Best->Function); 2568 2569 case OR_No_Viable_Function: 2570 if (InitEntity) 2571 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2572 << InitEntity << Range; 2573 else 2574 Diag(Loc, diag::err_ovl_no_viable_function_in_init) 2575 << ClassType << Range; 2576 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 2577 return 0; 2578 2579 case OR_Ambiguous: 2580 if (InitEntity) 2581 Diag(Loc, diag::err_ovl_ambiguous_init) << InitEntity << Range; 2582 else 2583 Diag(Loc, diag::err_ovl_ambiguous_init) << ClassType << Range; 2584 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2585 return 0; 2586 2587 case OR_Deleted: 2588 if (InitEntity) 2589 Diag(Loc, diag::err_ovl_deleted_init) 2590 << Best->Function->isDeleted() 2591 << InitEntity << Range; 2592 else 2593 Diag(Loc, diag::err_ovl_deleted_init) 2594 << Best->Function->isDeleted() 2595 << InitEntity << Range; 2596 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2597 return 0; 2598 } 2599 2600 return 0; 2601} 2602 2603/// CompareReferenceRelationship - Compare the two types T1 and T2 to 2604/// determine whether they are reference-related, 2605/// reference-compatible, reference-compatible with added 2606/// qualification, or incompatible, for use in C++ initialization by 2607/// reference (C++ [dcl.ref.init]p4). Neither type can be a reference 2608/// type, and the first type (T1) is the pointee type of the reference 2609/// type being initialized. 2610Sema::ReferenceCompareResult 2611Sema::CompareReferenceRelationship(QualType T1, QualType T2, 2612 bool& DerivedToBase) { 2613 assert(!T1->isReferenceType() && 2614 "T1 must be the pointee type of the reference type"); 2615 assert(!T2->isReferenceType() && "T2 cannot be a reference type"); 2616 2617 T1 = Context.getCanonicalType(T1); 2618 T2 = Context.getCanonicalType(T2); 2619 QualType UnqualT1 = T1.getUnqualifiedType(); 2620 QualType UnqualT2 = T2.getUnqualifiedType(); 2621 2622 // C++ [dcl.init.ref]p4: 2623 // Given types "cv1 T1" and "cv2 T2," "cv1 T1" is 2624 // reference-related to "cv2 T2" if T1 is the same type as T2, or 2625 // T1 is a base class of T2. 2626 if (UnqualT1 == UnqualT2) 2627 DerivedToBase = false; 2628 else if (IsDerivedFrom(UnqualT2, UnqualT1)) 2629 DerivedToBase = true; 2630 else 2631 return Ref_Incompatible; 2632 2633 // At this point, we know that T1 and T2 are reference-related (at 2634 // least). 2635 2636 // C++ [dcl.init.ref]p4: 2637 // "cv1 T1" is reference-compatible with "cv2 T2" if T1 is 2638 // reference-related to T2 and cv1 is the same cv-qualification 2639 // as, or greater cv-qualification than, cv2. For purposes of 2640 // overload resolution, cases for which cv1 is greater 2641 // cv-qualification than cv2 are identified as 2642 // reference-compatible with added qualification (see 13.3.3.2). 2643 if (T1.getCVRQualifiers() == T2.getCVRQualifiers()) 2644 return Ref_Compatible; 2645 else if (T1.isMoreQualifiedThan(T2)) 2646 return Ref_Compatible_With_Added_Qualification; 2647 else 2648 return Ref_Related; 2649} 2650 2651/// CheckReferenceInit - Check the initialization of a reference 2652/// variable with the given initializer (C++ [dcl.init.ref]). Init is 2653/// the initializer (either a simple initializer or an initializer 2654/// list), and DeclType is the type of the declaration. When ICS is 2655/// non-null, this routine will compute the implicit conversion 2656/// sequence according to C++ [over.ics.ref] and will not produce any 2657/// diagnostics; when ICS is null, it will emit diagnostics when any 2658/// errors are found. Either way, a return value of true indicates 2659/// that there was a failure, a return value of false indicates that 2660/// the reference initialization succeeded. 2661/// 2662/// When @p SuppressUserConversions, user-defined conversions are 2663/// suppressed. 2664/// When @p AllowExplicit, we also permit explicit user-defined 2665/// conversion functions. 2666/// When @p ForceRValue, we unconditionally treat the initializer as an rvalue. 2667bool 2668Sema::CheckReferenceInit(Expr *&Init, QualType DeclType, 2669 ImplicitConversionSequence *ICS, 2670 bool SuppressUserConversions, 2671 bool AllowExplicit, bool ForceRValue) { 2672 assert(DeclType->isReferenceType() && "Reference init needs a reference"); 2673 2674 QualType T1 = DeclType->getAs<ReferenceType>()->getPointeeType(); 2675 QualType T2 = Init->getType(); 2676 2677 // If the initializer is the address of an overloaded function, try 2678 // to resolve the overloaded function. If all goes well, T2 is the 2679 // type of the resulting function. 2680 if (Context.getCanonicalType(T2) == Context.OverloadTy) { 2681 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Init, DeclType, 2682 ICS != 0); 2683 if (Fn) { 2684 // Since we're performing this reference-initialization for 2685 // real, update the initializer with the resulting function. 2686 if (!ICS) { 2687 if (DiagnoseUseOfDecl(Fn, Init->getSourceRange().getBegin())) 2688 return true; 2689 2690 FixOverloadedFunctionReference(Init, Fn); 2691 } 2692 2693 T2 = Fn->getType(); 2694 } 2695 } 2696 2697 // Compute some basic properties of the types and the initializer. 2698 bool isRValRef = DeclType->isRValueReferenceType(); 2699 bool DerivedToBase = false; 2700 Expr::isLvalueResult InitLvalue = ForceRValue ? Expr::LV_InvalidExpression : 2701 Init->isLvalue(Context); 2702 ReferenceCompareResult RefRelationship 2703 = CompareReferenceRelationship(T1, T2, DerivedToBase); 2704 2705 // Most paths end in a failed conversion. 2706 if (ICS) 2707 ICS->ConversionKind = ImplicitConversionSequence::BadConversion; 2708 2709 // C++ [dcl.init.ref]p5: 2710 // A reference to type "cv1 T1" is initialized by an expression 2711 // of type "cv2 T2" as follows: 2712 2713 // -- If the initializer expression 2714 2715 // Rvalue references cannot bind to lvalues (N2812). 2716 // There is absolutely no situation where they can. In particular, note that 2717 // this is ill-formed, even if B has a user-defined conversion to A&&: 2718 // B b; 2719 // A&& r = b; 2720 if (isRValRef && InitLvalue == Expr::LV_Valid) { 2721 if (!ICS) 2722 Diag(Init->getSourceRange().getBegin(), diag::err_lvalue_to_rvalue_ref) 2723 << Init->getSourceRange(); 2724 return true; 2725 } 2726 2727 bool BindsDirectly = false; 2728 // -- is an lvalue (but is not a bit-field), and "cv1 T1" is 2729 // reference-compatible with "cv2 T2," or 2730 // 2731 // Note that the bit-field check is skipped if we are just computing 2732 // the implicit conversion sequence (C++ [over.best.ics]p2). 2733 if (InitLvalue == Expr::LV_Valid && (ICS || !Init->getBitField()) && 2734 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2735 BindsDirectly = true; 2736 2737 if (ICS) { 2738 // C++ [over.ics.ref]p1: 2739 // When a parameter of reference type binds directly (8.5.3) 2740 // to an argument expression, the implicit conversion sequence 2741 // is the identity conversion, unless the argument expression 2742 // has a type that is a derived class of the parameter type, 2743 // in which case the implicit conversion sequence is a 2744 // derived-to-base Conversion (13.3.3.1). 2745 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2746 ICS->Standard.First = ICK_Identity; 2747 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2748 ICS->Standard.Third = ICK_Identity; 2749 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2750 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2751 ICS->Standard.ReferenceBinding = true; 2752 ICS->Standard.DirectBinding = true; 2753 ICS->Standard.RRefBinding = false; 2754 ICS->Standard.CopyConstructor = 0; 2755 2756 // Nothing more to do: the inaccessibility/ambiguity check for 2757 // derived-to-base conversions is suppressed when we're 2758 // computing the implicit conversion sequence (C++ 2759 // [over.best.ics]p2). 2760 return false; 2761 } else { 2762 // Perform the conversion. 2763 // FIXME: Binding to a subobject of the lvalue is going to require more 2764 // AST annotation than this. 2765 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2766 } 2767 } 2768 2769 // -- has a class type (i.e., T2 is a class type) and can be 2770 // implicitly converted to an lvalue of type "cv3 T3," 2771 // where "cv1 T1" is reference-compatible with "cv3 T3" 2772 // 92) (this conversion is selected by enumerating the 2773 // applicable conversion functions (13.3.1.6) and choosing 2774 // the best one through overload resolution (13.3)), 2775 if (!isRValRef && !SuppressUserConversions && T2->isRecordType()) { 2776 // FIXME: Look for conversions in base classes! 2777 CXXRecordDecl *T2RecordDecl 2778 = dyn_cast<CXXRecordDecl>(T2->getAs<RecordType>()->getDecl()); 2779 2780 OverloadCandidateSet CandidateSet; 2781 OverloadedFunctionDecl *Conversions 2782 = T2RecordDecl->getConversionFunctions(); 2783 for (OverloadedFunctionDecl::function_iterator Func 2784 = Conversions->function_begin(); 2785 Func != Conversions->function_end(); ++Func) { 2786 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func); 2787 2788 // If the conversion function doesn't return a reference type, 2789 // it can't be considered for this conversion. 2790 if (Conv->getConversionType()->isLValueReferenceType() && 2791 (AllowExplicit || !Conv->isExplicit())) 2792 AddConversionCandidate(Conv, Init, DeclType, CandidateSet); 2793 } 2794 2795 OverloadCandidateSet::iterator Best; 2796 switch (BestViableFunction(CandidateSet, Init->getLocStart(), Best)) { 2797 case OR_Success: 2798 // This is a direct binding. 2799 BindsDirectly = true; 2800 2801 if (ICS) { 2802 // C++ [over.ics.ref]p1: 2803 // 2804 // [...] If the parameter binds directly to the result of 2805 // applying a conversion function to the argument 2806 // expression, the implicit conversion sequence is a 2807 // user-defined conversion sequence (13.3.3.1.2), with the 2808 // second standard conversion sequence either an identity 2809 // conversion or, if the conversion function returns an 2810 // entity of a type that is a derived class of the parameter 2811 // type, a derived-to-base Conversion. 2812 ICS->ConversionKind = ImplicitConversionSequence::UserDefinedConversion; 2813 ICS->UserDefined.Before = Best->Conversions[0].Standard; 2814 ICS->UserDefined.After = Best->FinalConversion; 2815 ICS->UserDefined.ConversionFunction = Best->Function; 2816 assert(ICS->UserDefined.After.ReferenceBinding && 2817 ICS->UserDefined.After.DirectBinding && 2818 "Expected a direct reference binding!"); 2819 return false; 2820 } else { 2821 // Perform the conversion. 2822 // FIXME: Binding to a subobject of the lvalue is going to require more 2823 // AST annotation than this. 2824 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/true); 2825 } 2826 break; 2827 2828 case OR_Ambiguous: 2829 assert(false && "Ambiguous reference binding conversions not implemented."); 2830 return true; 2831 2832 case OR_No_Viable_Function: 2833 case OR_Deleted: 2834 // There was no suitable conversion, or we found a deleted 2835 // conversion; continue with other checks. 2836 break; 2837 } 2838 } 2839 2840 if (BindsDirectly) { 2841 // C++ [dcl.init.ref]p4: 2842 // [...] In all cases where the reference-related or 2843 // reference-compatible relationship of two types is used to 2844 // establish the validity of a reference binding, and T1 is a 2845 // base class of T2, a program that necessitates such a binding 2846 // is ill-formed if T1 is an inaccessible (clause 11) or 2847 // ambiguous (10.2) base class of T2. 2848 // 2849 // Note that we only check this condition when we're allowed to 2850 // complain about errors, because we should not be checking for 2851 // ambiguity (or inaccessibility) unless the reference binding 2852 // actually happens. 2853 if (DerivedToBase) 2854 return CheckDerivedToBaseConversion(T2, T1, 2855 Init->getSourceRange().getBegin(), 2856 Init->getSourceRange()); 2857 else 2858 return false; 2859 } 2860 2861 // -- Otherwise, the reference shall be to a non-volatile const 2862 // type (i.e., cv1 shall be const), or the reference shall be an 2863 // rvalue reference and the initializer expression shall be an rvalue. 2864 if (!isRValRef && T1.getCVRQualifiers() != QualType::Const) { 2865 if (!ICS) 2866 Diag(Init->getSourceRange().getBegin(), 2867 diag::err_not_reference_to_const_init) 2868 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2869 << T2 << Init->getSourceRange(); 2870 return true; 2871 } 2872 2873 // -- If the initializer expression is an rvalue, with T2 a 2874 // class type, and "cv1 T1" is reference-compatible with 2875 // "cv2 T2," the reference is bound in one of the 2876 // following ways (the choice is implementation-defined): 2877 // 2878 // -- The reference is bound to the object represented by 2879 // the rvalue (see 3.10) or to a sub-object within that 2880 // object. 2881 // 2882 // -- A temporary of type "cv1 T2" [sic] is created, and 2883 // a constructor is called to copy the entire rvalue 2884 // object into the temporary. The reference is bound to 2885 // the temporary or to a sub-object within the 2886 // temporary. 2887 // 2888 // The constructor that would be used to make the copy 2889 // shall be callable whether or not the copy is actually 2890 // done. 2891 // 2892 // Note that C++0x [dcl.init.ref]p5 takes away this implementation 2893 // freedom, so we will always take the first option and never build 2894 // a temporary in this case. FIXME: We will, however, have to check 2895 // for the presence of a copy constructor in C++98/03 mode. 2896 if (InitLvalue != Expr::LV_Valid && T2->isRecordType() && 2897 RefRelationship >= Ref_Compatible_With_Added_Qualification) { 2898 if (ICS) { 2899 ICS->ConversionKind = ImplicitConversionSequence::StandardConversion; 2900 ICS->Standard.First = ICK_Identity; 2901 ICS->Standard.Second = DerivedToBase? ICK_Derived_To_Base : ICK_Identity; 2902 ICS->Standard.Third = ICK_Identity; 2903 ICS->Standard.FromTypePtr = T2.getAsOpaquePtr(); 2904 ICS->Standard.ToTypePtr = T1.getAsOpaquePtr(); 2905 ICS->Standard.ReferenceBinding = true; 2906 ICS->Standard.DirectBinding = false; 2907 ICS->Standard.RRefBinding = isRValRef; 2908 ICS->Standard.CopyConstructor = 0; 2909 } else { 2910 // FIXME: Binding to a subobject of the rvalue is going to require more 2911 // AST annotation than this. 2912 ImpCastExprToType(Init, T1, CastExpr::CK_Unknown, /*isLvalue=*/false); 2913 } 2914 return false; 2915 } 2916 2917 // -- Otherwise, a temporary of type "cv1 T1" is created and 2918 // initialized from the initializer expression using the 2919 // rules for a non-reference copy initialization (8.5). The 2920 // reference is then bound to the temporary. If T1 is 2921 // reference-related to T2, cv1 must be the same 2922 // cv-qualification as, or greater cv-qualification than, 2923 // cv2; otherwise, the program is ill-formed. 2924 if (RefRelationship == Ref_Related) { 2925 // If cv1 == cv2 or cv1 is a greater cv-qualified than cv2, then 2926 // we would be reference-compatible or reference-compatible with 2927 // added qualification. But that wasn't the case, so the reference 2928 // initialization fails. 2929 if (!ICS) 2930 Diag(Init->getSourceRange().getBegin(), 2931 diag::err_reference_init_drops_quals) 2932 << T1 << (InitLvalue != Expr::LV_Valid? "temporary" : "value") 2933 << T2 << Init->getSourceRange(); 2934 return true; 2935 } 2936 2937 // If at least one of the types is a class type, the types are not 2938 // related, and we aren't allowed any user conversions, the 2939 // reference binding fails. This case is important for breaking 2940 // recursion, since TryImplicitConversion below will attempt to 2941 // create a temporary through the use of a copy constructor. 2942 if (SuppressUserConversions && RefRelationship == Ref_Incompatible && 2943 (T1->isRecordType() || T2->isRecordType())) { 2944 if (!ICS) 2945 Diag(Init->getSourceRange().getBegin(), 2946 diag::err_typecheck_convert_incompatible) 2947 << DeclType << Init->getType() << "initializing" << Init->getSourceRange(); 2948 return true; 2949 } 2950 2951 // Actually try to convert the initializer to T1. 2952 if (ICS) { 2953 // C++ [over.ics.ref]p2: 2954 // 2955 // When a parameter of reference type is not bound directly to 2956 // an argument expression, the conversion sequence is the one 2957 // required to convert the argument expression to the 2958 // underlying type of the reference according to 2959 // 13.3.3.1. Conceptually, this conversion sequence corresponds 2960 // to copy-initializing a temporary of the underlying type with 2961 // the argument expression. Any difference in top-level 2962 // cv-qualification is subsumed by the initialization itself 2963 // and does not constitute a conversion. 2964 *ICS = TryImplicitConversion(Init, T1, SuppressUserConversions); 2965 // Of course, that's still a reference binding. 2966 if (ICS->ConversionKind == ImplicitConversionSequence::StandardConversion) { 2967 ICS->Standard.ReferenceBinding = true; 2968 ICS->Standard.RRefBinding = isRValRef; 2969 } else if(ICS->ConversionKind == 2970 ImplicitConversionSequence::UserDefinedConversion) { 2971 ICS->UserDefined.After.ReferenceBinding = true; 2972 ICS->UserDefined.After.RRefBinding = isRValRef; 2973 } 2974 return ICS->ConversionKind == ImplicitConversionSequence::BadConversion; 2975 } else { 2976 return PerformImplicitConversion(Init, T1, "initializing"); 2977 } 2978} 2979 2980/// CheckOverloadedOperatorDeclaration - Check whether the declaration 2981/// of this overloaded operator is well-formed. If so, returns false; 2982/// otherwise, emits appropriate diagnostics and returns true. 2983bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 2984 assert(FnDecl && FnDecl->isOverloadedOperator() && 2985 "Expected an overloaded operator declaration"); 2986 2987 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 2988 2989 // C++ [over.oper]p5: 2990 // The allocation and deallocation functions, operator new, 2991 // operator new[], operator delete and operator delete[], are 2992 // described completely in 3.7.3. The attributes and restrictions 2993 // found in the rest of this subclause do not apply to them unless 2994 // explicitly stated in 3.7.3. 2995 // FIXME: Write a separate routine for checking this. For now, just allow it. 2996 if (Op == OO_New || Op == OO_Array_New || 2997 Op == OO_Delete || Op == OO_Array_Delete) 2998 return false; 2999 3000 // C++ [over.oper]p6: 3001 // An operator function shall either be a non-static member 3002 // function or be a non-member function and have at least one 3003 // parameter whose type is a class, a reference to a class, an 3004 // enumeration, or a reference to an enumeration. 3005 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 3006 if (MethodDecl->isStatic()) 3007 return Diag(FnDecl->getLocation(), 3008 diag::err_operator_overload_static) << FnDecl->getDeclName(); 3009 } else { 3010 bool ClassOrEnumParam = false; 3011 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 3012 ParamEnd = FnDecl->param_end(); 3013 Param != ParamEnd; ++Param) { 3014 QualType ParamType = (*Param)->getType().getNonReferenceType(); 3015 if (ParamType->isDependentType() || ParamType->isRecordType() || 3016 ParamType->isEnumeralType()) { 3017 ClassOrEnumParam = true; 3018 break; 3019 } 3020 } 3021 3022 if (!ClassOrEnumParam) 3023 return Diag(FnDecl->getLocation(), 3024 diag::err_operator_overload_needs_class_or_enum) 3025 << FnDecl->getDeclName(); 3026 } 3027 3028 // C++ [over.oper]p8: 3029 // An operator function cannot have default arguments (8.3.6), 3030 // except where explicitly stated below. 3031 // 3032 // Only the function-call operator allows default arguments 3033 // (C++ [over.call]p1). 3034 if (Op != OO_Call) { 3035 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 3036 Param != FnDecl->param_end(); ++Param) { 3037 if ((*Param)->hasUnparsedDefaultArg()) 3038 return Diag((*Param)->getLocation(), 3039 diag::err_operator_overload_default_arg) 3040 << FnDecl->getDeclName(); 3041 else if (Expr *DefArg = (*Param)->getDefaultArg()) 3042 return Diag((*Param)->getLocation(), 3043 diag::err_operator_overload_default_arg) 3044 << FnDecl->getDeclName() << DefArg->getSourceRange(); 3045 } 3046 } 3047 3048 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 3049 { false, false, false } 3050#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 3051 , { Unary, Binary, MemberOnly } 3052#include "clang/Basic/OperatorKinds.def" 3053 }; 3054 3055 bool CanBeUnaryOperator = OperatorUses[Op][0]; 3056 bool CanBeBinaryOperator = OperatorUses[Op][1]; 3057 bool MustBeMemberOperator = OperatorUses[Op][2]; 3058 3059 // C++ [over.oper]p8: 3060 // [...] Operator functions cannot have more or fewer parameters 3061 // than the number required for the corresponding operator, as 3062 // described in the rest of this subclause. 3063 unsigned NumParams = FnDecl->getNumParams() 3064 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 3065 if (Op != OO_Call && 3066 ((NumParams == 1 && !CanBeUnaryOperator) || 3067 (NumParams == 2 && !CanBeBinaryOperator) || 3068 (NumParams < 1) || (NumParams > 2))) { 3069 // We have the wrong number of parameters. 3070 unsigned ErrorKind; 3071 if (CanBeUnaryOperator && CanBeBinaryOperator) { 3072 ErrorKind = 2; // 2 -> unary or binary. 3073 } else if (CanBeUnaryOperator) { 3074 ErrorKind = 0; // 0 -> unary 3075 } else { 3076 assert(CanBeBinaryOperator && 3077 "All non-call overloaded operators are unary or binary!"); 3078 ErrorKind = 1; // 1 -> binary 3079 } 3080 3081 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 3082 << FnDecl->getDeclName() << NumParams << ErrorKind; 3083 } 3084 3085 // Overloaded operators other than operator() cannot be variadic. 3086 if (Op != OO_Call && 3087 FnDecl->getType()->getAsFunctionProtoType()->isVariadic()) { 3088 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 3089 << FnDecl->getDeclName(); 3090 } 3091 3092 // Some operators must be non-static member functions. 3093 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 3094 return Diag(FnDecl->getLocation(), 3095 diag::err_operator_overload_must_be_member) 3096 << FnDecl->getDeclName(); 3097 } 3098 3099 // C++ [over.inc]p1: 3100 // The user-defined function called operator++ implements the 3101 // prefix and postfix ++ operator. If this function is a member 3102 // function with no parameters, or a non-member function with one 3103 // parameter of class or enumeration type, it defines the prefix 3104 // increment operator ++ for objects of that type. If the function 3105 // is a member function with one parameter (which shall be of type 3106 // int) or a non-member function with two parameters (the second 3107 // of which shall be of type int), it defines the postfix 3108 // increment operator ++ for objects of that type. 3109 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 3110 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 3111 bool ParamIsInt = false; 3112 if (const BuiltinType *BT = LastParam->getType()->getAsBuiltinType()) 3113 ParamIsInt = BT->getKind() == BuiltinType::Int; 3114 3115 if (!ParamIsInt) 3116 return Diag(LastParam->getLocation(), 3117 diag::err_operator_overload_post_incdec_must_be_int) 3118 << LastParam->getType() << (Op == OO_MinusMinus); 3119 } 3120 3121 // Notify the class if it got an assignment operator. 3122 if (Op == OO_Equal) { 3123 // Would have returned earlier otherwise. 3124 assert(isa<CXXMethodDecl>(FnDecl) && 3125 "Overloaded = not member, but not filtered."); 3126 CXXMethodDecl *Method = cast<CXXMethodDecl>(FnDecl); 3127 Method->getParent()->addedAssignmentOperator(Context, Method); 3128 } 3129 3130 return false; 3131} 3132 3133/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 3134/// linkage specification, including the language and (if present) 3135/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 3136/// the location of the language string literal, which is provided 3137/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 3138/// the '{' brace. Otherwise, this linkage specification does not 3139/// have any braces. 3140Sema::DeclPtrTy Sema::ActOnStartLinkageSpecification(Scope *S, 3141 SourceLocation ExternLoc, 3142 SourceLocation LangLoc, 3143 const char *Lang, 3144 unsigned StrSize, 3145 SourceLocation LBraceLoc) { 3146 LinkageSpecDecl::LanguageIDs Language; 3147 if (strncmp(Lang, "\"C\"", StrSize) == 0) 3148 Language = LinkageSpecDecl::lang_c; 3149 else if (strncmp(Lang, "\"C++\"", StrSize) == 0) 3150 Language = LinkageSpecDecl::lang_cxx; 3151 else { 3152 Diag(LangLoc, diag::err_bad_language); 3153 return DeclPtrTy(); 3154 } 3155 3156 // FIXME: Add all the various semantics of linkage specifications 3157 3158 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 3159 LangLoc, Language, 3160 LBraceLoc.isValid()); 3161 CurContext->addDecl(D); 3162 PushDeclContext(S, D); 3163 return DeclPtrTy::make(D); 3164} 3165 3166/// ActOnFinishLinkageSpecification - Completely the definition of 3167/// the C++ linkage specification LinkageSpec. If RBraceLoc is 3168/// valid, it's the position of the closing '}' brace in a linkage 3169/// specification that uses braces. 3170Sema::DeclPtrTy Sema::ActOnFinishLinkageSpecification(Scope *S, 3171 DeclPtrTy LinkageSpec, 3172 SourceLocation RBraceLoc) { 3173 if (LinkageSpec) 3174 PopDeclContext(); 3175 return LinkageSpec; 3176} 3177 3178/// \brief Perform semantic analysis for the variable declaration that 3179/// occurs within a C++ catch clause, returning the newly-created 3180/// variable. 3181VarDecl *Sema::BuildExceptionDeclaration(Scope *S, QualType ExDeclType, 3182 IdentifierInfo *Name, 3183 SourceLocation Loc, 3184 SourceRange Range) { 3185 bool Invalid = false; 3186 3187 // Arrays and functions decay. 3188 if (ExDeclType->isArrayType()) 3189 ExDeclType = Context.getArrayDecayedType(ExDeclType); 3190 else if (ExDeclType->isFunctionType()) 3191 ExDeclType = Context.getPointerType(ExDeclType); 3192 3193 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 3194 // The exception-declaration shall not denote a pointer or reference to an 3195 // incomplete type, other than [cv] void*. 3196 // N2844 forbids rvalue references. 3197 if(!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 3198 Diag(Loc, diag::err_catch_rvalue_ref) << Range; 3199 Invalid = true; 3200 } 3201 3202 QualType BaseType = ExDeclType; 3203 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 3204 unsigned DK = diag::err_catch_incomplete; 3205 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 3206 BaseType = Ptr->getPointeeType(); 3207 Mode = 1; 3208 DK = diag::err_catch_incomplete_ptr; 3209 } else if(const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 3210 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 3211 BaseType = Ref->getPointeeType(); 3212 Mode = 2; 3213 DK = diag::err_catch_incomplete_ref; 3214 } 3215 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 3216 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 3217 Invalid = true; 3218 3219 if (!Invalid && !ExDeclType->isDependentType() && 3220 RequireNonAbstractType(Loc, ExDeclType, 3221 diag::err_abstract_type_in_decl, 3222 AbstractVariableType)) 3223 Invalid = true; 3224 3225 // FIXME: Need to test for ability to copy-construct and destroy the 3226 // exception variable. 3227 3228 // FIXME: Need to check for abstract classes. 3229 3230 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, Loc, 3231 Name, ExDeclType, VarDecl::None, 3232 Range.getBegin()); 3233 3234 if (Invalid) 3235 ExDecl->setInvalidDecl(); 3236 3237 return ExDecl; 3238} 3239 3240/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 3241/// handler. 3242Sema::DeclPtrTy Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 3243 QualType ExDeclType = GetTypeForDeclarator(D, S); 3244 3245 bool Invalid = D.isInvalidType(); 3246 IdentifierInfo *II = D.getIdentifier(); 3247 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3248 // The scope should be freshly made just for us. There is just no way 3249 // it contains any previous declaration. 3250 assert(!S->isDeclScope(DeclPtrTy::make(PrevDecl))); 3251 if (PrevDecl->isTemplateParameter()) { 3252 // Maybe we will complain about the shadowed template parameter. 3253 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3254 } 3255 } 3256 3257 if (D.getCXXScopeSpec().isSet() && !Invalid) { 3258 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 3259 << D.getCXXScopeSpec().getRange(); 3260 Invalid = true; 3261 } 3262 3263 VarDecl *ExDecl = BuildExceptionDeclaration(S, ExDeclType, 3264 D.getIdentifier(), 3265 D.getIdentifierLoc(), 3266 D.getDeclSpec().getSourceRange()); 3267 3268 if (Invalid) 3269 ExDecl->setInvalidDecl(); 3270 3271 // Add the exception declaration into this scope. 3272 if (II) 3273 PushOnScopeChains(ExDecl, S); 3274 else 3275 CurContext->addDecl(ExDecl); 3276 3277 ProcessDeclAttributes(S, ExDecl, D); 3278 return DeclPtrTy::make(ExDecl); 3279} 3280 3281Sema::DeclPtrTy Sema::ActOnStaticAssertDeclaration(SourceLocation AssertLoc, 3282 ExprArg assertexpr, 3283 ExprArg assertmessageexpr) { 3284 Expr *AssertExpr = (Expr *)assertexpr.get(); 3285 StringLiteral *AssertMessage = 3286 cast<StringLiteral>((Expr *)assertmessageexpr.get()); 3287 3288 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent()) { 3289 llvm::APSInt Value(32); 3290 if (!AssertExpr->isIntegerConstantExpr(Value, Context)) { 3291 Diag(AssertLoc, diag::err_static_assert_expression_is_not_constant) << 3292 AssertExpr->getSourceRange(); 3293 return DeclPtrTy(); 3294 } 3295 3296 if (Value == 0) { 3297 std::string str(AssertMessage->getStrData(), 3298 AssertMessage->getByteLength()); 3299 Diag(AssertLoc, diag::err_static_assert_failed) 3300 << str << AssertExpr->getSourceRange(); 3301 } 3302 } 3303 3304 assertexpr.release(); 3305 assertmessageexpr.release(); 3306 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, AssertLoc, 3307 AssertExpr, AssertMessage); 3308 3309 CurContext->addDecl(Decl); 3310 return DeclPtrTy::make(Decl); 3311} 3312 3313Sema::DeclPtrTy Sema::ActOnFriendDecl(Scope *S, 3314 llvm::PointerUnion<const DeclSpec*,Declarator*> DU, 3315 bool IsDefinition) { 3316 Declarator *D = DU.dyn_cast<Declarator*>(); 3317 const DeclSpec &DS = (D ? D->getDeclSpec() : *DU.get<const DeclSpec*>()); 3318 3319 assert(DS.isFriendSpecified()); 3320 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 3321 3322 // If there's no declarator, then this can only be a friend class 3323 // declaration (or else it's just syntactically invalid). 3324 if (!D) { 3325 SourceLocation Loc = DS.getSourceRange().getBegin(); 3326 3327 QualType T; 3328 DeclContext *DC; 3329 3330 // In C++0x, we just accept any old type. 3331 if (getLangOptions().CPlusPlus0x) { 3332 bool invalid = false; 3333 QualType T = ConvertDeclSpecToType(DS, Loc, invalid); 3334 if (invalid) 3335 return DeclPtrTy(); 3336 3337 // The semantic context in which to create the decl. If it's not 3338 // a record decl (or we don't yet know if it is), create it in the 3339 // current context. 3340 DC = CurContext; 3341 if (const RecordType *RT = T->getAs<RecordType>()) 3342 DC = RT->getDecl()->getDeclContext(); 3343 3344 // The C++98 rules are somewhat more complex. 3345 } else { 3346 // C++ [class.friend]p2: 3347 // An elaborated-type-specifier shall be used in a friend declaration 3348 // for a class.* 3349 // * The class-key of the elaborated-type-specifier is required. 3350 CXXRecordDecl *RD = 0; 3351 3352 switch (DS.getTypeSpecType()) { 3353 case DeclSpec::TST_class: 3354 case DeclSpec::TST_struct: 3355 case DeclSpec::TST_union: 3356 RD = dyn_cast_or_null<CXXRecordDecl>((Decl*) DS.getTypeRep()); 3357 if (!RD) return DeclPtrTy(); 3358 break; 3359 3360 case DeclSpec::TST_typename: 3361 if (const RecordType *RT = 3362 ((const Type*) DS.getTypeRep())->getAs<RecordType>()) 3363 RD = dyn_cast<CXXRecordDecl>(RT->getDecl()); 3364 // fallthrough 3365 default: 3366 if (RD) { 3367 Diag(DS.getFriendSpecLoc(), diag::err_unelaborated_friend_type) 3368 << (RD->isUnion()) 3369 << CodeModificationHint::CreateInsertion(DS.getTypeSpecTypeLoc(), 3370 RD->isUnion() ? " union" : " class"); 3371 return DeclPtrTy::make(RD); 3372 } 3373 3374 Diag(DS.getFriendSpecLoc(), diag::err_unexpected_friend) 3375 << DS.getSourceRange(); 3376 return DeclPtrTy(); 3377 } 3378 3379 // The record declaration we get from friend declarations is not 3380 // canonicalized; see ActOnTag. 3381 assert(RD); 3382 3383 // C++ [class.friend]p2: A class shall not be defined inside 3384 // a friend declaration. 3385 if (RD->isDefinition()) 3386 Diag(DS.getFriendSpecLoc(), diag::err_friend_decl_defines_class) 3387 << RD->getSourceRange(); 3388 3389 // C++98 [class.friend]p1: A friend of a class is a function 3390 // or class that is not a member of the class . . . 3391 // But that's a silly restriction which nobody implements for 3392 // inner classes, and C++0x removes it anyway, so we only report 3393 // this (as a warning) if we're being pedantic. 3394 // 3395 // Also, definitions currently get treated in a way that causes 3396 // this error, so only report it if we didn't see a definition. 3397 else if (RD->getDeclContext() == CurContext && 3398 !getLangOptions().CPlusPlus0x) 3399 Diag(DS.getFriendSpecLoc(), diag::ext_friend_inner_class); 3400 3401 T = QualType(RD->getTypeForDecl(), 0); 3402 DC = RD->getDeclContext(); 3403 } 3404 3405 FriendClassDecl *FCD = FriendClassDecl::Create(Context, DC, Loc, T, 3406 DS.getFriendSpecLoc()); 3407 FCD->setLexicalDeclContext(CurContext); 3408 3409 if (CurContext->isDependentContext()) 3410 CurContext->addHiddenDecl(FCD); 3411 else 3412 CurContext->addDecl(FCD); 3413 3414 return DeclPtrTy::make(FCD); 3415 } 3416 3417 // We have a declarator. 3418 assert(D); 3419 3420 SourceLocation Loc = D->getIdentifierLoc(); 3421 QualType T = GetTypeForDeclarator(*D, S); 3422 3423 // C++ [class.friend]p1 3424 // A friend of a class is a function or class.... 3425 // Note that this sees through typedefs, which is intended. 3426 if (!T->isFunctionType()) { 3427 Diag(Loc, diag::err_unexpected_friend); 3428 3429 // It might be worthwhile to try to recover by creating an 3430 // appropriate declaration. 3431 return DeclPtrTy(); 3432 } 3433 3434 // C++ [namespace.memdef]p3 3435 // - If a friend declaration in a non-local class first declares a 3436 // class or function, the friend class or function is a member 3437 // of the innermost enclosing namespace. 3438 // - The name of the friend is not found by simple name lookup 3439 // until a matching declaration is provided in that namespace 3440 // scope (either before or after the class declaration granting 3441 // friendship). 3442 // - If a friend function is called, its name may be found by the 3443 // name lookup that considers functions from namespaces and 3444 // classes associated with the types of the function arguments. 3445 // - When looking for a prior declaration of a class or a function 3446 // declared as a friend, scopes outside the innermost enclosing 3447 // namespace scope are not considered. 3448 3449 CXXScopeSpec &ScopeQual = D->getCXXScopeSpec(); 3450 DeclarationName Name = GetNameForDeclarator(*D); 3451 assert(Name); 3452 3453 // The existing declaration we found. 3454 FunctionDecl *FD = NULL; 3455 3456 // The context we found the declaration in, or in which we should 3457 // create the declaration. 3458 DeclContext *DC; 3459 3460 // FIXME: handle local classes 3461 3462 // Recover from invalid scope qualifiers as if they just weren't there. 3463 if (!ScopeQual.isInvalid() && ScopeQual.isSet()) { 3464 DC = computeDeclContext(ScopeQual); 3465 3466 // FIXME: handle dependent contexts 3467 if (!DC) return DeclPtrTy(); 3468 3469 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3470 3471 // If searching in that context implicitly found a declaration in 3472 // a different context, treat it like it wasn't found at all. 3473 // TODO: better diagnostics for this case. Suggesting the right 3474 // qualified scope would be nice... 3475 if (!Dec || Dec->getDeclContext() != DC) { 3476 D->setInvalidType(); 3477 Diag(Loc, diag::err_qualified_friend_not_found) << Name << T; 3478 return DeclPtrTy(); 3479 } 3480 3481 // C++ [class.friend]p1: A friend of a class is a function or 3482 // class that is not a member of the class . . . 3483 if (DC == CurContext) 3484 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3485 3486 FD = cast<FunctionDecl>(Dec); 3487 3488 // Otherwise walk out to the nearest namespace scope looking for matches. 3489 } else { 3490 // TODO: handle local class contexts. 3491 3492 DC = CurContext; 3493 while (true) { 3494 // Skip class contexts. If someone can cite chapter and verse 3495 // for this behavior, that would be nice --- it's what GCC and 3496 // EDG do, and it seems like a reasonable intent, but the spec 3497 // really only says that checks for unqualified existing 3498 // declarations should stop at the nearest enclosing namespace, 3499 // not that they should only consider the nearest enclosing 3500 // namespace. 3501 while (DC->isRecord()) DC = DC->getParent(); 3502 3503 Decl *Dec = LookupQualifiedNameWithType(DC, Name, T); 3504 3505 // TODO: decide what we think about using declarations. 3506 if (Dec) { 3507 FD = cast<FunctionDecl>(Dec); 3508 break; 3509 } 3510 if (DC->isFileContext()) break; 3511 DC = DC->getParent(); 3512 } 3513 3514 // C++ [class.friend]p1: A friend of a class is a function or 3515 // class that is not a member of the class . . . 3516 // C++0x changes this for both friend types and functions. 3517 // Most C++ 98 compilers do seem to give an error here, so 3518 // we do, too. 3519 if (FD && DC == CurContext && !getLangOptions().CPlusPlus0x) 3520 Diag(DS.getFriendSpecLoc(), diag::err_friend_is_member); 3521 } 3522 3523 bool Redeclaration = (FD != 0); 3524 3525 // If we found a match, create a friend function declaration with 3526 // that function as the previous declaration. 3527 if (Redeclaration) { 3528 // Create it in the semantic context of the original declaration. 3529 DC = FD->getDeclContext(); 3530 3531 // If we didn't find something matching the type exactly, create 3532 // a declaration. This declaration should only be findable via 3533 // argument-dependent lookup. 3534 } else { 3535 assert(DC->isFileContext()); 3536 3537 // This implies that it has to be an operator or function. 3538 if (D->getKind() == Declarator::DK_Constructor || 3539 D->getKind() == Declarator::DK_Destructor || 3540 D->getKind() == Declarator::DK_Conversion) { 3541 Diag(Loc, diag::err_introducing_special_friend) << 3542 (D->getKind() == Declarator::DK_Constructor ? 0 : 3543 D->getKind() == Declarator::DK_Destructor ? 1 : 2); 3544 return DeclPtrTy(); 3545 } 3546 } 3547 3548 NamedDecl *ND = ActOnFunctionDeclarator(S, *D, DC, T, 3549 /* PrevDecl = */ FD, 3550 MultiTemplateParamsArg(*this), 3551 IsDefinition, 3552 Redeclaration); 3553 FD = cast_or_null<FriendFunctionDecl>(ND); 3554 3555 // If this is a dependent context, just add the decl to the 3556 // class's decl list and don't both with the lookup tables. This 3557 // doesn't affect lookup because any call that might find this 3558 // function via ADL necessarily has to involve dependently-typed 3559 // arguments and hence can't be resolved until 3560 // template-instantiation anyway. 3561 if (CurContext->isDependentContext()) 3562 CurContext->addHiddenDecl(FD); 3563 else 3564 CurContext->addDecl(FD); 3565 3566 return DeclPtrTy::make(FD); 3567} 3568 3569void Sema::SetDeclDeleted(DeclPtrTy dcl, SourceLocation DelLoc) { 3570 Decl *Dcl = dcl.getAs<Decl>(); 3571 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 3572 if (!Fn) { 3573 Diag(DelLoc, diag::err_deleted_non_function); 3574 return; 3575 } 3576 if (const FunctionDecl *Prev = Fn->getPreviousDeclaration()) { 3577 Diag(DelLoc, diag::err_deleted_decl_not_first); 3578 Diag(Prev->getLocation(), diag::note_previous_declaration); 3579 // If the declaration wasn't the first, we delete the function anyway for 3580 // recovery. 3581 } 3582 Fn->setDeleted(); 3583} 3584 3585static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 3586 for (Stmt::child_iterator CI = S->child_begin(), E = S->child_end(); CI != E; 3587 ++CI) { 3588 Stmt *SubStmt = *CI; 3589 if (!SubStmt) 3590 continue; 3591 if (isa<ReturnStmt>(SubStmt)) 3592 Self.Diag(SubStmt->getSourceRange().getBegin(), 3593 diag::err_return_in_constructor_handler); 3594 if (!isa<Expr>(SubStmt)) 3595 SearchForReturnInStmt(Self, SubStmt); 3596 } 3597} 3598 3599void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 3600 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 3601 CXXCatchStmt *Handler = TryBlock->getHandler(I); 3602 SearchForReturnInStmt(*this, Handler); 3603 } 3604} 3605 3606bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 3607 const CXXMethodDecl *Old) { 3608 QualType NewTy = New->getType()->getAsFunctionType()->getResultType(); 3609 QualType OldTy = Old->getType()->getAsFunctionType()->getResultType(); 3610 3611 QualType CNewTy = Context.getCanonicalType(NewTy); 3612 QualType COldTy = Context.getCanonicalType(OldTy); 3613 3614 if (CNewTy == COldTy && 3615 CNewTy.getCVRQualifiers() == COldTy.getCVRQualifiers()) 3616 return false; 3617 3618 // Check if the return types are covariant 3619 QualType NewClassTy, OldClassTy; 3620 3621 /// Both types must be pointers or references to classes. 3622 if (PointerType *NewPT = dyn_cast<PointerType>(NewTy)) { 3623 if (PointerType *OldPT = dyn_cast<PointerType>(OldTy)) { 3624 NewClassTy = NewPT->getPointeeType(); 3625 OldClassTy = OldPT->getPointeeType(); 3626 } 3627 } else if (ReferenceType *NewRT = dyn_cast<ReferenceType>(NewTy)) { 3628 if (ReferenceType *OldRT = dyn_cast<ReferenceType>(OldTy)) { 3629 NewClassTy = NewRT->getPointeeType(); 3630 OldClassTy = OldRT->getPointeeType(); 3631 } 3632 } 3633 3634 // The return types aren't either both pointers or references to a class type. 3635 if (NewClassTy.isNull()) { 3636 Diag(New->getLocation(), 3637 diag::err_different_return_type_for_overriding_virtual_function) 3638 << New->getDeclName() << NewTy << OldTy; 3639 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3640 3641 return true; 3642 } 3643 3644 if (NewClassTy.getUnqualifiedType() != OldClassTy.getUnqualifiedType()) { 3645 // Check if the new class derives from the old class. 3646 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 3647 Diag(New->getLocation(), 3648 diag::err_covariant_return_not_derived) 3649 << New->getDeclName() << NewTy << OldTy; 3650 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3651 return true; 3652 } 3653 3654 // Check if we the conversion from derived to base is valid. 3655 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 3656 diag::err_covariant_return_inaccessible_base, 3657 diag::err_covariant_return_ambiguous_derived_to_base_conv, 3658 // FIXME: Should this point to the return type? 3659 New->getLocation(), SourceRange(), New->getDeclName())) { 3660 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3661 return true; 3662 } 3663 } 3664 3665 // The qualifiers of the return types must be the same. 3666 if (CNewTy.getCVRQualifiers() != COldTy.getCVRQualifiers()) { 3667 Diag(New->getLocation(), 3668 diag::err_covariant_return_type_different_qualifications) 3669 << New->getDeclName() << NewTy << OldTy; 3670 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3671 return true; 3672 }; 3673 3674 3675 // The new class type must have the same or less qualifiers as the old type. 3676 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 3677 Diag(New->getLocation(), 3678 diag::err_covariant_return_type_class_type_more_qualified) 3679 << New->getDeclName() << NewTy << OldTy; 3680 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 3681 return true; 3682 }; 3683 3684 return false; 3685} 3686 3687bool Sema::CheckOverridingFunctionExceptionSpec(const CXXMethodDecl *New, 3688 const CXXMethodDecl *Old) 3689{ 3690 return CheckExceptionSpecSubset(diag::err_override_exception_spec, 3691 diag::note_overridden_virtual_function, 3692 Old->getType()->getAsFunctionProtoType(), 3693 Old->getLocation(), 3694 New->getType()->getAsFunctionProtoType(), 3695 New->getLocation()); 3696} 3697 3698/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse an 3699/// initializer for the declaration 'Dcl'. 3700/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 3701/// static data member of class X, names should be looked up in the scope of 3702/// class X. 3703void Sema::ActOnCXXEnterDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3704 Decl *D = Dcl.getAs<Decl>(); 3705 // If there is no declaration, there was an error parsing it. 3706 if (D == 0) 3707 return; 3708 3709 // Check whether it is a declaration with a nested name specifier like 3710 // int foo::bar; 3711 if (!D->isOutOfLine()) 3712 return; 3713 3714 // C++ [basic.lookup.unqual]p13 3715 // 3716 // A name used in the definition of a static data member of class X 3717 // (after the qualified-id of the static member) is looked up as if the name 3718 // was used in a member function of X. 3719 3720 // Change current context into the context of the initializing declaration. 3721 EnterDeclaratorContext(S, D->getDeclContext()); 3722} 3723 3724/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 3725/// initializer for the declaration 'Dcl'. 3726void Sema::ActOnCXXExitDeclInitializer(Scope *S, DeclPtrTy Dcl) { 3727 Decl *D = Dcl.getAs<Decl>(); 3728 // If there is no declaration, there was an error parsing it. 3729 if (D == 0) 3730 return; 3731 3732 // Check whether it is a declaration with a nested name specifier like 3733 // int foo::bar; 3734 if (!D->isOutOfLine()) 3735 return; 3736 3737 assert(S->getEntity() == D->getDeclContext() && "Context imbalance!"); 3738 ExitDeclaratorContext(S); 3739} 3740