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 "clang/Sema/SemaInternal.h" 15 #include "clang/AST/ASTConsumer.h" 16 #include "clang/AST/ASTContext.h" 17 #include "clang/AST/ASTMutationListener.h" 18 #include "clang/AST/CXXInheritance.h" 19 #include "clang/AST/CharUnits.h" 20 #include "clang/AST/DeclVisitor.h" 21 #include "clang/AST/EvaluatedExprVisitor.h" 22 #include "clang/AST/ExprCXX.h" 23 #include "clang/AST/RecordLayout.h" 24 #include "clang/AST/RecursiveASTVisitor.h" 25 #include "clang/AST/StmtVisitor.h" 26 #include "clang/AST/TypeLoc.h" 27 #include "clang/AST/TypeOrdering.h" 28 #include "clang/Basic/PartialDiagnostic.h" 29 #include "clang/Basic/TargetInfo.h" 30 #include "clang/Lex/Preprocessor.h" 31 #include "clang/Sema/CXXFieldCollector.h" 32 #include "clang/Sema/DeclSpec.h" 33 #include "clang/Sema/Initialization.h" 34 #include "clang/Sema/Lookup.h" 35 #include "clang/Sema/ParsedTemplate.h" 36 #include "clang/Sema/Scope.h" 37 #include "clang/Sema/ScopeInfo.h" 38 #include "llvm/ADT/STLExtras.h" 39 #include "llvm/ADT/SmallString.h" 40 #include <map> 41 #include <set> 42 43 using namespace clang; 44 45 //===----------------------------------------------------------------------===// 46 // CheckDefaultArgumentVisitor 47 //===----------------------------------------------------------------------===// 48 49 namespace { 50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 51 /// the default argument of a parameter to determine whether it 52 /// contains any ill-formed subexpressions. For example, this will 53 /// diagnose the use of local variables or parameters within the 54 /// default argument expression. 55 class CheckDefaultArgumentVisitor 56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 57 Expr *DefaultArg; 58 Sema *S; 59 60 public: 61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 62 : DefaultArg(defarg), S(s) {} 63 64 bool VisitExpr(Expr *Node); 65 bool VisitDeclRefExpr(DeclRefExpr *DRE); 66 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 67 bool VisitLambdaExpr(LambdaExpr *Lambda); 68 }; 69 70 /// VisitExpr - Visit all of the children of this expression. 71 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 72 bool IsInvalid = false; 73 for (Stmt::child_range I = Node->children(); I; ++I) 74 IsInvalid |= Visit(*I); 75 return IsInvalid; 76 } 77 78 /// VisitDeclRefExpr - Visit a reference to a declaration, to 79 /// determine whether this declaration can be used in the default 80 /// argument expression. 81 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 82 NamedDecl *Decl = DRE->getDecl(); 83 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 84 // C++ [dcl.fct.default]p9 85 // Default arguments are evaluated each time the function is 86 // called. The order of evaluation of function arguments is 87 // unspecified. Consequently, parameters of a function shall not 88 // be used in default argument expressions, even if they are not 89 // evaluated. Parameters of a function declared before a default 90 // argument expression are in scope and can hide namespace and 91 // class member names. 92 return S->Diag(DRE->getLocStart(), 93 diag::err_param_default_argument_references_param) 94 << Param->getDeclName() << DefaultArg->getSourceRange(); 95 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 96 // C++ [dcl.fct.default]p7 97 // Local variables shall not be used in default argument 98 // expressions. 99 if (VDecl->isLocalVarDecl()) 100 return S->Diag(DRE->getLocStart(), 101 diag::err_param_default_argument_references_local) 102 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 103 } 104 105 return false; 106 } 107 108 /// VisitCXXThisExpr - Visit a C++ "this" expression. 109 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 110 // C++ [dcl.fct.default]p8: 111 // The keyword this shall not be used in a default argument of a 112 // member function. 113 return S->Diag(ThisE->getLocStart(), 114 diag::err_param_default_argument_references_this) 115 << ThisE->getSourceRange(); 116 } 117 118 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 119 // C++11 [expr.lambda.prim]p13: 120 // A lambda-expression appearing in a default argument shall not 121 // implicitly or explicitly capture any entity. 122 if (Lambda->capture_begin() == Lambda->capture_end()) 123 return false; 124 125 return S->Diag(Lambda->getLocStart(), 126 diag::err_lambda_capture_default_arg); 127 } 128 } 129 130 void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 131 CXXMethodDecl *Method) { 132 // If we have an MSAny spec already, don't bother. 133 if (!Method || ComputedEST == EST_MSAny) 134 return; 135 136 const FunctionProtoType *Proto 137 = Method->getType()->getAs<FunctionProtoType>(); 138 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 139 if (!Proto) 140 return; 141 142 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 143 144 // If this function can throw any exceptions, make a note of that. 145 if (EST == EST_MSAny || EST == EST_None) { 146 ClearExceptions(); 147 ComputedEST = EST; 148 return; 149 } 150 151 // FIXME: If the call to this decl is using any of its default arguments, we 152 // need to search them for potentially-throwing calls. 153 154 // If this function has a basic noexcept, it doesn't affect the outcome. 155 if (EST == EST_BasicNoexcept) 156 return; 157 158 // If we have a throw-all spec at this point, ignore the function. 159 if (ComputedEST == EST_None) 160 return; 161 162 // If we're still at noexcept(true) and there's a nothrow() callee, 163 // change to that specification. 164 if (EST == EST_DynamicNone) { 165 if (ComputedEST == EST_BasicNoexcept) 166 ComputedEST = EST_DynamicNone; 167 return; 168 } 169 170 // Check out noexcept specs. 171 if (EST == EST_ComputedNoexcept) { 172 FunctionProtoType::NoexceptResult NR = 173 Proto->getNoexceptSpec(Self->Context); 174 assert(NR != FunctionProtoType::NR_NoNoexcept && 175 "Must have noexcept result for EST_ComputedNoexcept."); 176 assert(NR != FunctionProtoType::NR_Dependent && 177 "Should not generate implicit declarations for dependent cases, " 178 "and don't know how to handle them anyway."); 179 180 // noexcept(false) -> no spec on the new function 181 if (NR == FunctionProtoType::NR_Throw) { 182 ClearExceptions(); 183 ComputedEST = EST_None; 184 } 185 // noexcept(true) won't change anything either. 186 return; 187 } 188 189 assert(EST == EST_Dynamic && "EST case not considered earlier."); 190 assert(ComputedEST != EST_None && 191 "Shouldn't collect exceptions when throw-all is guaranteed."); 192 ComputedEST = EST_Dynamic; 193 // Record the exceptions in this function's exception specification. 194 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 195 EEnd = Proto->exception_end(); 196 E != EEnd; ++E) 197 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 198 Exceptions.push_back(*E); 199 } 200 201 void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 202 if (!E || ComputedEST == EST_MSAny) 203 return; 204 205 // FIXME: 206 // 207 // C++0x [except.spec]p14: 208 // [An] implicit exception-specification specifies the type-id T if and 209 // only if T is allowed by the exception-specification of a function directly 210 // invoked by f's implicit definition; f shall allow all exceptions if any 211 // function it directly invokes allows all exceptions, and f shall allow no 212 // exceptions if every function it directly invokes allows no exceptions. 213 // 214 // Note in particular that if an implicit exception-specification is generated 215 // for a function containing a throw-expression, that specification can still 216 // be noexcept(true). 217 // 218 // Note also that 'directly invoked' is not defined in the standard, and there 219 // is no indication that we should only consider potentially-evaluated calls. 220 // 221 // Ultimately we should implement the intent of the standard: the exception 222 // specification should be the set of exceptions which can be thrown by the 223 // implicit definition. For now, we assume that any non-nothrow expression can 224 // throw any exception. 225 226 if (Self->canThrow(E)) 227 ComputedEST = EST_None; 228 } 229 230 bool 231 Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 232 SourceLocation EqualLoc) { 233 if (RequireCompleteType(Param->getLocation(), Param->getType(), 234 diag::err_typecheck_decl_incomplete_type)) { 235 Param->setInvalidDecl(); 236 return true; 237 } 238 239 // C++ [dcl.fct.default]p5 240 // A default argument expression is implicitly converted (clause 241 // 4) to the parameter type. The default argument expression has 242 // the same semantic constraints as the initializer expression in 243 // a declaration of a variable of the parameter type, using the 244 // copy-initialization semantics (8.5). 245 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 246 Param); 247 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 248 EqualLoc); 249 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 250 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckCompletedExpr(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274 } 275 276 /// ActOnParamDefaultArgument - Check whether the default argument 277 /// provided for a function parameter is well-formed. If so, attach it 278 /// to the parameter declaration. 279 void 280 Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310 } 311 312 /// ActOnParamUnparsedDefaultArgument - We've seen a default 313 /// argument for a function parameter, but we can't parse it yet 314 /// because we're inside a class definition. Note that this default 315 /// argument will be parsed later. 316 void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327 } 328 329 /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330 /// the default argument for the parameter param failed. 331 void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340 } 341 342 /// CheckExtraCXXDefaultArguments - Check for any extra default 343 /// arguments in the declarator, which is not a function declaration 344 /// or definition and therefore is not permitted to have default 345 /// arguments. This routine should be invoked for every declarator 346 /// that is not a function declaration or definition. 347 void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 bool MightBeFunction = D.isFunctionDeclarationContext(); 356 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 357 DeclaratorChunk &chunk = D.getTypeObject(i); 358 if (chunk.Kind == DeclaratorChunk::Function) { 359 if (MightBeFunction) { 360 // This is a function declaration. It can have default arguments, but 361 // keep looking in case its return type is a function type with default 362 // arguments. 363 MightBeFunction = false; 364 continue; 365 } 366 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 367 ParmVarDecl *Param = 368 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 369 if (Param->hasUnparsedDefaultArg()) { 370 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 371 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 372 << SourceRange((*Toks)[1].getLocation(), 373 Toks->back().getLocation()); 374 delete Toks; 375 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 376 } else if (Param->getDefaultArg()) { 377 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 378 << Param->getDefaultArg()->getSourceRange(); 379 Param->setDefaultArg(0); 380 } 381 } 382 } else if (chunk.Kind != DeclaratorChunk::Paren) { 383 MightBeFunction = false; 384 } 385 } 386 } 387 388 /// MergeCXXFunctionDecl - Merge two declarations of the same C++ 389 /// function, once we already know that they have the same 390 /// type. Subroutine of MergeFunctionDecl. Returns true if there was an 391 /// error, false otherwise. 392 bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 393 Scope *S) { 394 bool Invalid = false; 395 396 // C++ [dcl.fct.default]p4: 397 // For non-template functions, default arguments can be added in 398 // later declarations of a function in the same 399 // scope. Declarations in different scopes have completely 400 // distinct sets of default arguments. That is, declarations in 401 // inner scopes do not acquire default arguments from 402 // declarations in outer scopes, and vice versa. In a given 403 // function declaration, all parameters subsequent to a 404 // parameter with a default argument shall have default 405 // arguments supplied in this or previous declarations. A 406 // default argument shall not be redefined by a later 407 // declaration (not even to the same value). 408 // 409 // C++ [dcl.fct.default]p6: 410 // Except for member functions of class templates, the default arguments 411 // in a member function definition that appears outside of the class 412 // definition are added to the set of default arguments provided by the 413 // member function declaration in the class definition. 414 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 415 ParmVarDecl *OldParam = Old->getParamDecl(p); 416 ParmVarDecl *NewParam = New->getParamDecl(p); 417 418 bool OldParamHasDfl = OldParam->hasDefaultArg(); 419 bool NewParamHasDfl = NewParam->hasDefaultArg(); 420 421 NamedDecl *ND = Old; 422 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 423 // Ignore default parameters of old decl if they are not in 424 // the same scope. 425 OldParamHasDfl = false; 426 427 if (OldParamHasDfl && NewParamHasDfl) { 428 429 unsigned DiagDefaultParamID = 430 diag::err_param_default_argument_redefinition; 431 432 // MSVC accepts that default parameters be redefined for member functions 433 // of template class. The new default parameter's value is ignored. 434 Invalid = true; 435 if (getLangOpts().MicrosoftExt) { 436 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 437 if (MD && MD->getParent()->getDescribedClassTemplate()) { 438 // Merge the old default argument into the new parameter. 439 NewParam->setHasInheritedDefaultArg(); 440 if (OldParam->hasUninstantiatedDefaultArg()) 441 NewParam->setUninstantiatedDefaultArg( 442 OldParam->getUninstantiatedDefaultArg()); 443 else 444 NewParam->setDefaultArg(OldParam->getInit()); 445 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 446 Invalid = false; 447 } 448 } 449 450 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 451 // hint here. Alternatively, we could walk the type-source information 452 // for NewParam to find the last source location in the type... but it 453 // isn't worth the effort right now. This is the kind of test case that 454 // is hard to get right: 455 // int f(int); 456 // void g(int (*fp)(int) = f); 457 // void g(int (*fp)(int) = &f); 458 Diag(NewParam->getLocation(), DiagDefaultParamID) 459 << NewParam->getDefaultArgRange(); 460 461 // Look for the function declaration where the default argument was 462 // actually written, which may be a declaration prior to Old. 463 for (FunctionDecl *Older = Old->getPreviousDecl(); 464 Older; Older = Older->getPreviousDecl()) { 465 if (!Older->getParamDecl(p)->hasDefaultArg()) 466 break; 467 468 OldParam = Older->getParamDecl(p); 469 } 470 471 Diag(OldParam->getLocation(), diag::note_previous_definition) 472 << OldParam->getDefaultArgRange(); 473 } else if (OldParamHasDfl) { 474 // Merge the old default argument into the new parameter. 475 // It's important to use getInit() here; getDefaultArg() 476 // strips off any top-level ExprWithCleanups. 477 NewParam->setHasInheritedDefaultArg(); 478 if (OldParam->hasUninstantiatedDefaultArg()) 479 NewParam->setUninstantiatedDefaultArg( 480 OldParam->getUninstantiatedDefaultArg()); 481 else 482 NewParam->setDefaultArg(OldParam->getInit()); 483 } else if (NewParamHasDfl) { 484 if (New->getDescribedFunctionTemplate()) { 485 // Paragraph 4, quoted above, only applies to non-template functions. 486 Diag(NewParam->getLocation(), 487 diag::err_param_default_argument_template_redecl) 488 << NewParam->getDefaultArgRange(); 489 Diag(Old->getLocation(), diag::note_template_prev_declaration) 490 << false; 491 } else if (New->getTemplateSpecializationKind() 492 != TSK_ImplicitInstantiation && 493 New->getTemplateSpecializationKind() != TSK_Undeclared) { 494 // C++ [temp.expr.spec]p21: 495 // Default function arguments shall not be specified in a declaration 496 // or a definition for one of the following explicit specializations: 497 // - the explicit specialization of a function template; 498 // - the explicit specialization of a member function template; 499 // - the explicit specialization of a member function of a class 500 // template where the class template specialization to which the 501 // member function specialization belongs is implicitly 502 // instantiated. 503 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 504 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 505 << New->getDeclName() 506 << NewParam->getDefaultArgRange(); 507 } else if (New->getDeclContext()->isDependentContext()) { 508 // C++ [dcl.fct.default]p6 (DR217): 509 // Default arguments for a member function of a class template shall 510 // be specified on the initial declaration of the member function 511 // within the class template. 512 // 513 // Reading the tea leaves a bit in DR217 and its reference to DR205 514 // leads me to the conclusion that one cannot add default function 515 // arguments for an out-of-line definition of a member function of a 516 // dependent type. 517 int WhichKind = 2; 518 if (CXXRecordDecl *Record 519 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 520 if (Record->getDescribedClassTemplate()) 521 WhichKind = 0; 522 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 523 WhichKind = 1; 524 else 525 WhichKind = 2; 526 } 527 528 Diag(NewParam->getLocation(), 529 diag::err_param_default_argument_member_template_redecl) 530 << WhichKind 531 << NewParam->getDefaultArgRange(); 532 } 533 } 534 } 535 536 // DR1344: If a default argument is added outside a class definition and that 537 // default argument makes the function a special member function, the program 538 // is ill-formed. This can only happen for constructors. 539 if (isa<CXXConstructorDecl>(New) && 540 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 541 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 542 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 543 if (NewSM != OldSM) { 544 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 545 assert(NewParam->hasDefaultArg()); 546 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 547 << NewParam->getDefaultArgRange() << NewSM; 548 Diag(Old->getLocation(), diag::note_previous_declaration); 549 } 550 } 551 552 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 553 // template has a constexpr specifier then all its declarations shall 554 // contain the constexpr specifier. 555 if (New->isConstexpr() != Old->isConstexpr()) { 556 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 557 << New << New->isConstexpr(); 558 Diag(Old->getLocation(), diag::note_previous_declaration); 559 Invalid = true; 560 } 561 562 if (CheckEquivalentExceptionSpec(Old, New)) 563 Invalid = true; 564 565 return Invalid; 566 } 567 568 /// \brief Merge the exception specifications of two variable declarations. 569 /// 570 /// This is called when there's a redeclaration of a VarDecl. The function 571 /// checks if the redeclaration might have an exception specification and 572 /// validates compatibility and merges the specs if necessary. 573 void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 574 // Shortcut if exceptions are disabled. 575 if (!getLangOpts().CXXExceptions) 576 return; 577 578 assert(Context.hasSameType(New->getType(), Old->getType()) && 579 "Should only be called if types are otherwise the same."); 580 581 QualType NewType = New->getType(); 582 QualType OldType = Old->getType(); 583 584 // We're only interested in pointers and references to functions, as well 585 // as pointers to member functions. 586 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 587 NewType = R->getPointeeType(); 588 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 589 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 590 NewType = P->getPointeeType(); 591 OldType = OldType->getAs<PointerType>()->getPointeeType(); 592 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 593 NewType = M->getPointeeType(); 594 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 595 } 596 597 if (!NewType->isFunctionProtoType()) 598 return; 599 600 // There's lots of special cases for functions. For function pointers, system 601 // libraries are hopefully not as broken so that we don't need these 602 // workarounds. 603 if (CheckEquivalentExceptionSpec( 604 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 605 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 606 New->setInvalidDecl(); 607 } 608 } 609 610 /// CheckCXXDefaultArguments - Verify that the default arguments for a 611 /// function declaration are well-formed according to C++ 612 /// [dcl.fct.default]. 613 void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 614 unsigned NumParams = FD->getNumParams(); 615 unsigned p; 616 617 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 618 isa<CXXMethodDecl>(FD) && 619 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 620 621 // Find first parameter with a default argument 622 for (p = 0; p < NumParams; ++p) { 623 ParmVarDecl *Param = FD->getParamDecl(p); 624 if (Param->hasDefaultArg()) { 625 // C++11 [expr.prim.lambda]p5: 626 // [...] Default arguments (8.3.6) shall not be specified in the 627 // parameter-declaration-clause of a lambda-declarator. 628 // 629 // FIXME: Core issue 974 strikes this sentence, we only provide an 630 // extension warning. 631 if (IsLambda) 632 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 633 << Param->getDefaultArgRange(); 634 break; 635 } 636 } 637 638 // C++ [dcl.fct.default]p4: 639 // In a given function declaration, all parameters 640 // subsequent to a parameter with a default argument shall 641 // have default arguments supplied in this or previous 642 // declarations. A default argument shall not be redefined 643 // by a later declaration (not even to the same value). 644 unsigned LastMissingDefaultArg = 0; 645 for (; p < NumParams; ++p) { 646 ParmVarDecl *Param = FD->getParamDecl(p); 647 if (!Param->hasDefaultArg()) { 648 if (Param->isInvalidDecl()) 649 /* We already complained about this parameter. */; 650 else if (Param->getIdentifier()) 651 Diag(Param->getLocation(), 652 diag::err_param_default_argument_missing_name) 653 << Param->getIdentifier(); 654 else 655 Diag(Param->getLocation(), 656 diag::err_param_default_argument_missing); 657 658 LastMissingDefaultArg = p; 659 } 660 } 661 662 if (LastMissingDefaultArg > 0) { 663 // Some default arguments were missing. Clear out all of the 664 // default arguments up to (and including) the last missing 665 // default argument, so that we leave the function parameters 666 // in a semantically valid state. 667 for (p = 0; p <= LastMissingDefaultArg; ++p) { 668 ParmVarDecl *Param = FD->getParamDecl(p); 669 if (Param->hasDefaultArg()) { 670 Param->setDefaultArg(0); 671 } 672 } 673 } 674 } 675 676 // CheckConstexprParameterTypes - Check whether a function's parameter types 677 // are all literal types. If so, return true. If not, produce a suitable 678 // diagnostic and return false. 679 static bool CheckConstexprParameterTypes(Sema &SemaRef, 680 const FunctionDecl *FD) { 681 unsigned ArgIndex = 0; 682 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 683 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 684 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 685 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 686 SourceLocation ParamLoc = PD->getLocation(); 687 if (!(*i)->isDependentType() && 688 SemaRef.RequireLiteralType(ParamLoc, *i, 689 diag::err_constexpr_non_literal_param, 690 ArgIndex+1, PD->getSourceRange(), 691 isa<CXXConstructorDecl>(FD))) 692 return false; 693 } 694 return true; 695 } 696 697 /// \brief Get diagnostic %select index for tag kind for 698 /// record diagnostic message. 699 /// WARNING: Indexes apply to particular diagnostics only! 700 /// 701 /// \returns diagnostic %select index. 702 static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 703 switch (Tag) { 704 case TTK_Struct: return 0; 705 case TTK_Interface: return 1; 706 case TTK_Class: return 2; 707 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 708 } 709 } 710 711 // CheckConstexprFunctionDecl - Check whether a function declaration satisfies 712 // the requirements of a constexpr function definition or a constexpr 713 // constructor definition. If so, return true. If not, produce appropriate 714 // diagnostics and return false. 715 // 716 // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 717 bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 718 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 719 if (MD && MD->isInstance()) { 720 // C++11 [dcl.constexpr]p4: 721 // The definition of a constexpr constructor shall satisfy the following 722 // constraints: 723 // - the class shall not have any virtual base classes; 724 const CXXRecordDecl *RD = MD->getParent(); 725 if (RD->getNumVBases()) { 726 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 727 << isa<CXXConstructorDecl>(NewFD) 728 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 729 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 730 E = RD->vbases_end(); I != E; ++I) 731 Diag(I->getLocStart(), 732 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 733 return false; 734 } 735 } 736 737 if (!isa<CXXConstructorDecl>(NewFD)) { 738 // C++11 [dcl.constexpr]p3: 739 // The definition of a constexpr function shall satisfy the following 740 // constraints: 741 // - it shall not be virtual; 742 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 743 if (Method && Method->isVirtual()) { 744 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 745 746 // If it's not obvious why this function is virtual, find an overridden 747 // function which uses the 'virtual' keyword. 748 const CXXMethodDecl *WrittenVirtual = Method; 749 while (!WrittenVirtual->isVirtualAsWritten()) 750 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 751 if (WrittenVirtual != Method) 752 Diag(WrittenVirtual->getLocation(), 753 diag::note_overridden_virtual_function); 754 return false; 755 } 756 757 // - its return type shall be a literal type; 758 QualType RT = NewFD->getResultType(); 759 if (!RT->isDependentType() && 760 RequireLiteralType(NewFD->getLocation(), RT, 761 diag::err_constexpr_non_literal_return)) 762 return false; 763 } 764 765 // - each of its parameter types shall be a literal type; 766 if (!CheckConstexprParameterTypes(*this, NewFD)) 767 return false; 768 769 return true; 770 } 771 772 /// Check the given declaration statement is legal within a constexpr function 773 /// body. C++0x [dcl.constexpr]p3,p4. 774 /// 775 /// \return true if the body is OK, false if we have diagnosed a problem. 776 static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 777 DeclStmt *DS) { 778 // C++0x [dcl.constexpr]p3 and p4: 779 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 780 // contain only 781 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 782 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 783 switch ((*DclIt)->getKind()) { 784 case Decl::StaticAssert: 785 case Decl::Using: 786 case Decl::UsingShadow: 787 case Decl::UsingDirective: 788 case Decl::UnresolvedUsingTypename: 789 // - static_assert-declarations 790 // - using-declarations, 791 // - using-directives, 792 continue; 793 794 case Decl::Typedef: 795 case Decl::TypeAlias: { 796 // - typedef declarations and alias-declarations that do not define 797 // classes or enumerations, 798 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 799 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 800 // Don't allow variably-modified types in constexpr functions. 801 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 802 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 803 << TL.getSourceRange() << TL.getType() 804 << isa<CXXConstructorDecl>(Dcl); 805 return false; 806 } 807 continue; 808 } 809 810 case Decl::Enum: 811 case Decl::CXXRecord: 812 // As an extension, we allow the declaration (but not the definition) of 813 // classes and enumerations in all declarations, not just in typedef and 814 // alias declarations. 815 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 816 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 817 << isa<CXXConstructorDecl>(Dcl); 818 return false; 819 } 820 continue; 821 822 case Decl::Var: 823 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 824 << isa<CXXConstructorDecl>(Dcl); 825 return false; 826 827 default: 828 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 829 << isa<CXXConstructorDecl>(Dcl); 830 return false; 831 } 832 } 833 834 return true; 835 } 836 837 /// Check that the given field is initialized within a constexpr constructor. 838 /// 839 /// \param Dcl The constexpr constructor being checked. 840 /// \param Field The field being checked. This may be a member of an anonymous 841 /// struct or union nested within the class being checked. 842 /// \param Inits All declarations, including anonymous struct/union members and 843 /// indirect members, for which any initialization was provided. 844 /// \param Diagnosed Set to true if an error is produced. 845 static void CheckConstexprCtorInitializer(Sema &SemaRef, 846 const FunctionDecl *Dcl, 847 FieldDecl *Field, 848 llvm::SmallSet<Decl*, 16> &Inits, 849 bool &Diagnosed) { 850 if (Field->isUnnamedBitfield()) 851 return; 852 853 if (Field->isAnonymousStructOrUnion() && 854 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 855 return; 856 857 if (!Inits.count(Field)) { 858 if (!Diagnosed) { 859 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 860 Diagnosed = true; 861 } 862 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 863 } else if (Field->isAnonymousStructOrUnion()) { 864 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 865 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 866 I != E; ++I) 867 // If an anonymous union contains an anonymous struct of which any member 868 // is initialized, all members must be initialized. 869 if (!RD->isUnion() || Inits.count(*I)) 870 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 871 } 872 } 873 874 /// Check the body for the given constexpr function declaration only contains 875 /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 876 /// 877 /// \return true if the body is OK, false if we have diagnosed a problem. 878 bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 879 if (isa<CXXTryStmt>(Body)) { 880 // C++11 [dcl.constexpr]p3: 881 // The definition of a constexpr function shall satisfy the following 882 // constraints: [...] 883 // - its function-body shall be = delete, = default, or a 884 // compound-statement 885 // 886 // C++11 [dcl.constexpr]p4: 887 // In the definition of a constexpr constructor, [...] 888 // - its function-body shall not be a function-try-block; 889 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 890 << isa<CXXConstructorDecl>(Dcl); 891 return false; 892 } 893 894 // - its function-body shall be [...] a compound-statement that contains only 895 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 896 897 SmallVector<SourceLocation, 4> ReturnStmts; 898 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 899 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 900 switch ((*BodyIt)->getStmtClass()) { 901 case Stmt::NullStmtClass: 902 // - null statements, 903 continue; 904 905 case Stmt::DeclStmtClass: 906 // - static_assert-declarations 907 // - using-declarations, 908 // - using-directives, 909 // - typedef declarations and alias-declarations that do not define 910 // classes or enumerations, 911 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 912 return false; 913 continue; 914 915 case Stmt::ReturnStmtClass: 916 // - and exactly one return statement; 917 if (isa<CXXConstructorDecl>(Dcl)) 918 break; 919 920 ReturnStmts.push_back((*BodyIt)->getLocStart()); 921 continue; 922 923 default: 924 break; 925 } 926 927 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 928 << isa<CXXConstructorDecl>(Dcl); 929 return false; 930 } 931 932 if (const CXXConstructorDecl *Constructor 933 = dyn_cast<CXXConstructorDecl>(Dcl)) { 934 const CXXRecordDecl *RD = Constructor->getParent(); 935 // DR1359: 936 // - every non-variant non-static data member and base class sub-object 937 // shall be initialized; 938 // - if the class is a non-empty union, or for each non-empty anonymous 939 // union member of a non-union class, exactly one non-static data member 940 // shall be initialized; 941 if (RD->isUnion()) { 942 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 943 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 944 return false; 945 } 946 } else if (!Constructor->isDependentContext() && 947 !Constructor->isDelegatingConstructor()) { 948 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 949 950 // Skip detailed checking if we have enough initializers, and we would 951 // allow at most one initializer per member. 952 bool AnyAnonStructUnionMembers = false; 953 unsigned Fields = 0; 954 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 955 E = RD->field_end(); I != E; ++I, ++Fields) { 956 if (I->isAnonymousStructOrUnion()) { 957 AnyAnonStructUnionMembers = true; 958 break; 959 } 960 } 961 if (AnyAnonStructUnionMembers || 962 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 963 // Check initialization of non-static data members. Base classes are 964 // always initialized so do not need to be checked. Dependent bases 965 // might not have initializers in the member initializer list. 966 llvm::SmallSet<Decl*, 16> Inits; 967 for (CXXConstructorDecl::init_const_iterator 968 I = Constructor->init_begin(), E = Constructor->init_end(); 969 I != E; ++I) { 970 if (FieldDecl *FD = (*I)->getMember()) 971 Inits.insert(FD); 972 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 973 Inits.insert(ID->chain_begin(), ID->chain_end()); 974 } 975 976 bool Diagnosed = false; 977 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 978 E = RD->field_end(); I != E; ++I) 979 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 980 if (Diagnosed) 981 return false; 982 } 983 } 984 } else { 985 if (ReturnStmts.empty()) { 986 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 987 return false; 988 } 989 if (ReturnStmts.size() > 1) { 990 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 991 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 992 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 993 return false; 994 } 995 } 996 997 // C++11 [dcl.constexpr]p5: 998 // if no function argument values exist such that the function invocation 999 // substitution would produce a constant expression, the program is 1000 // ill-formed; no diagnostic required. 1001 // C++11 [dcl.constexpr]p3: 1002 // - every constructor call and implicit conversion used in initializing the 1003 // return value shall be one of those allowed in a constant expression. 1004 // C++11 [dcl.constexpr]p4: 1005 // - every constructor involved in initializing non-static data members and 1006 // base class sub-objects shall be a constexpr constructor. 1007 SmallVector<PartialDiagnosticAt, 8> Diags; 1008 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1009 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1010 << isa<CXXConstructorDecl>(Dcl); 1011 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1012 Diag(Diags[I].first, Diags[I].second); 1013 // Don't return false here: we allow this for compatibility in 1014 // system headers. 1015 } 1016 1017 return true; 1018 } 1019 1020 /// isCurrentClassName - Determine whether the identifier II is the 1021 /// name of the class type currently being defined. In the case of 1022 /// nested classes, this will only return true if II is the name of 1023 /// the innermost class. 1024 bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1025 const CXXScopeSpec *SS) { 1026 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1027 1028 CXXRecordDecl *CurDecl; 1029 if (SS && SS->isSet() && !SS->isInvalid()) { 1030 DeclContext *DC = computeDeclContext(*SS, true); 1031 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1032 } else 1033 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1034 1035 if (CurDecl && CurDecl->getIdentifier()) 1036 return &II == CurDecl->getIdentifier(); 1037 else 1038 return false; 1039 } 1040 1041 /// \brief Determine whether the given class is a base class of the given 1042 /// class, including looking at dependent bases. 1043 static bool findCircularInheritance(const CXXRecordDecl *Class, 1044 const CXXRecordDecl *Current) { 1045 SmallVector<const CXXRecordDecl*, 8> Queue; 1046 1047 Class = Class->getCanonicalDecl(); 1048 while (true) { 1049 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1050 E = Current->bases_end(); 1051 I != E; ++I) { 1052 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1053 if (!Base) 1054 continue; 1055 1056 Base = Base->getDefinition(); 1057 if (!Base) 1058 continue; 1059 1060 if (Base->getCanonicalDecl() == Class) 1061 return true; 1062 1063 Queue.push_back(Base); 1064 } 1065 1066 if (Queue.empty()) 1067 return false; 1068 1069 Current = Queue.back(); 1070 Queue.pop_back(); 1071 } 1072 1073 return false; 1074 } 1075 1076 /// \brief Check the validity of a C++ base class specifier. 1077 /// 1078 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1079 /// and returns NULL otherwise. 1080 CXXBaseSpecifier * 1081 Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1082 SourceRange SpecifierRange, 1083 bool Virtual, AccessSpecifier Access, 1084 TypeSourceInfo *TInfo, 1085 SourceLocation EllipsisLoc) { 1086 QualType BaseType = TInfo->getType(); 1087 1088 // C++ [class.union]p1: 1089 // A union shall not have base classes. 1090 if (Class->isUnion()) { 1091 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1092 << SpecifierRange; 1093 return 0; 1094 } 1095 1096 if (EllipsisLoc.isValid() && 1097 !TInfo->getType()->containsUnexpandedParameterPack()) { 1098 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1099 << TInfo->getTypeLoc().getSourceRange(); 1100 EllipsisLoc = SourceLocation(); 1101 } 1102 1103 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1104 1105 if (BaseType->isDependentType()) { 1106 // Make sure that we don't have circular inheritance among our dependent 1107 // bases. For non-dependent bases, the check for completeness below handles 1108 // this. 1109 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1110 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1111 ((BaseDecl = BaseDecl->getDefinition()) && 1112 findCircularInheritance(Class, BaseDecl))) { 1113 Diag(BaseLoc, diag::err_circular_inheritance) 1114 << BaseType << Context.getTypeDeclType(Class); 1115 1116 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1117 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1118 << BaseType; 1119 1120 return 0; 1121 } 1122 } 1123 1124 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1125 Class->getTagKind() == TTK_Class, 1126 Access, TInfo, EllipsisLoc); 1127 } 1128 1129 // Base specifiers must be record types. 1130 if (!BaseType->isRecordType()) { 1131 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1132 return 0; 1133 } 1134 1135 // C++ [class.union]p1: 1136 // A union shall not be used as a base class. 1137 if (BaseType->isUnionType()) { 1138 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1139 return 0; 1140 } 1141 1142 // C++ [class.derived]p2: 1143 // The class-name in a base-specifier shall not be an incompletely 1144 // defined class. 1145 if (RequireCompleteType(BaseLoc, BaseType, 1146 diag::err_incomplete_base_class, SpecifierRange)) { 1147 Class->setInvalidDecl(); 1148 return 0; 1149 } 1150 1151 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1152 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1153 assert(BaseDecl && "Record type has no declaration"); 1154 BaseDecl = BaseDecl->getDefinition(); 1155 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1156 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1157 assert(CXXBaseDecl && "Base type is not a C++ type"); 1158 1159 // C++ [class]p3: 1160 // If a class is marked final and it appears as a base-type-specifier in 1161 // base-clause, the program is ill-formed. 1162 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1163 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1164 << CXXBaseDecl->getDeclName(); 1165 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1166 << CXXBaseDecl->getDeclName(); 1167 return 0; 1168 } 1169 1170 if (BaseDecl->isInvalidDecl()) 1171 Class->setInvalidDecl(); 1172 1173 // Create the base specifier. 1174 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1175 Class->getTagKind() == TTK_Class, 1176 Access, TInfo, EllipsisLoc); 1177 } 1178 1179 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1180 /// one entry in the base class list of a class specifier, for 1181 /// example: 1182 /// class foo : public bar, virtual private baz { 1183 /// 'public bar' and 'virtual private baz' are each base-specifiers. 1184 BaseResult 1185 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1186 ParsedAttributes &Attributes, 1187 bool Virtual, AccessSpecifier Access, 1188 ParsedType basetype, SourceLocation BaseLoc, 1189 SourceLocation EllipsisLoc) { 1190 if (!classdecl) 1191 return true; 1192 1193 AdjustDeclIfTemplate(classdecl); 1194 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1195 if (!Class) 1196 return true; 1197 1198 // We do not support any C++11 attributes on base-specifiers yet. 1199 // Diagnose any attributes we see. 1200 if (!Attributes.empty()) { 1201 for (AttributeList *Attr = Attributes.getList(); Attr; 1202 Attr = Attr->getNext()) { 1203 if (Attr->isInvalid() || 1204 Attr->getKind() == AttributeList::IgnoredAttribute) 1205 continue; 1206 Diag(Attr->getLoc(), 1207 Attr->getKind() == AttributeList::UnknownAttribute 1208 ? diag::warn_unknown_attribute_ignored 1209 : diag::err_base_specifier_attribute) 1210 << Attr->getName(); 1211 } 1212 } 1213 1214 TypeSourceInfo *TInfo = 0; 1215 GetTypeFromParser(basetype, &TInfo); 1216 1217 if (EllipsisLoc.isInvalid() && 1218 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1219 UPPC_BaseType)) 1220 return true; 1221 1222 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1223 Virtual, Access, TInfo, 1224 EllipsisLoc)) 1225 return BaseSpec; 1226 else 1227 Class->setInvalidDecl(); 1228 1229 return true; 1230 } 1231 1232 /// \brief Performs the actual work of attaching the given base class 1233 /// specifiers to a C++ class. 1234 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1235 unsigned NumBases) { 1236 if (NumBases == 0) 1237 return false; 1238 1239 // Used to keep track of which base types we have already seen, so 1240 // that we can properly diagnose redundant direct base types. Note 1241 // that the key is always the unqualified canonical type of the base 1242 // class. 1243 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1244 1245 // Copy non-redundant base specifiers into permanent storage. 1246 unsigned NumGoodBases = 0; 1247 bool Invalid = false; 1248 for (unsigned idx = 0; idx < NumBases; ++idx) { 1249 QualType NewBaseType 1250 = Context.getCanonicalType(Bases[idx]->getType()); 1251 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1252 1253 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1254 if (KnownBase) { 1255 // C++ [class.mi]p3: 1256 // A class shall not be specified as a direct base class of a 1257 // derived class more than once. 1258 Diag(Bases[idx]->getLocStart(), 1259 diag::err_duplicate_base_class) 1260 << KnownBase->getType() 1261 << Bases[idx]->getSourceRange(); 1262 1263 // Delete the duplicate base class specifier; we're going to 1264 // overwrite its pointer later. 1265 Context.Deallocate(Bases[idx]); 1266 1267 Invalid = true; 1268 } else { 1269 // Okay, add this new base class. 1270 KnownBase = Bases[idx]; 1271 Bases[NumGoodBases++] = Bases[idx]; 1272 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1273 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1274 if (Class->isInterface() && 1275 (!RD->isInterface() || 1276 KnownBase->getAccessSpecifier() != AS_public)) { 1277 // The Microsoft extension __interface does not permit bases that 1278 // are not themselves public interfaces. 1279 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1280 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1281 << RD->getSourceRange(); 1282 Invalid = true; 1283 } 1284 if (RD->hasAttr<WeakAttr>()) 1285 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1286 } 1287 } 1288 } 1289 1290 // Attach the remaining base class specifiers to the derived class. 1291 Class->setBases(Bases, NumGoodBases); 1292 1293 // Delete the remaining (good) base class specifiers, since their 1294 // data has been copied into the CXXRecordDecl. 1295 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1296 Context.Deallocate(Bases[idx]); 1297 1298 return Invalid; 1299 } 1300 1301 /// ActOnBaseSpecifiers - Attach the given base specifiers to the 1302 /// class, after checking whether there are any duplicate base 1303 /// classes. 1304 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1305 unsigned NumBases) { 1306 if (!ClassDecl || !Bases || !NumBases) 1307 return; 1308 1309 AdjustDeclIfTemplate(ClassDecl); 1310 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1311 (CXXBaseSpecifier**)(Bases), NumBases); 1312 } 1313 1314 static CXXRecordDecl *GetClassForType(QualType T) { 1315 if (const RecordType *RT = T->getAs<RecordType>()) 1316 return cast<CXXRecordDecl>(RT->getDecl()); 1317 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1318 return ICT->getDecl(); 1319 else 1320 return 0; 1321 } 1322 1323 /// \brief Determine whether the type \p Derived is a C++ class that is 1324 /// derived from the type \p Base. 1325 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1326 if (!getLangOpts().CPlusPlus) 1327 return false; 1328 1329 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1330 if (!DerivedRD) 1331 return false; 1332 1333 CXXRecordDecl *BaseRD = GetClassForType(Base); 1334 if (!BaseRD) 1335 return false; 1336 1337 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1338 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1339 } 1340 1341 /// \brief Determine whether the type \p Derived is a C++ class that is 1342 /// derived from the type \p Base. 1343 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1344 if (!getLangOpts().CPlusPlus) 1345 return false; 1346 1347 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1348 if (!DerivedRD) 1349 return false; 1350 1351 CXXRecordDecl *BaseRD = GetClassForType(Base); 1352 if (!BaseRD) 1353 return false; 1354 1355 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1356 } 1357 1358 void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1359 CXXCastPath &BasePathArray) { 1360 assert(BasePathArray.empty() && "Base path array must be empty!"); 1361 assert(Paths.isRecordingPaths() && "Must record paths!"); 1362 1363 const CXXBasePath &Path = Paths.front(); 1364 1365 // We first go backward and check if we have a virtual base. 1366 // FIXME: It would be better if CXXBasePath had the base specifier for 1367 // the nearest virtual base. 1368 unsigned Start = 0; 1369 for (unsigned I = Path.size(); I != 0; --I) { 1370 if (Path[I - 1].Base->isVirtual()) { 1371 Start = I - 1; 1372 break; 1373 } 1374 } 1375 1376 // Now add all bases. 1377 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1378 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1379 } 1380 1381 /// \brief Determine whether the given base path includes a virtual 1382 /// base class. 1383 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1384 for (CXXCastPath::const_iterator B = BasePath.begin(), 1385 BEnd = BasePath.end(); 1386 B != BEnd; ++B) 1387 if ((*B)->isVirtual()) 1388 return true; 1389 1390 return false; 1391 } 1392 1393 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1394 /// conversion (where Derived and Base are class types) is 1395 /// well-formed, meaning that the conversion is unambiguous (and 1396 /// that all of the base classes are accessible). Returns true 1397 /// and emits a diagnostic if the code is ill-formed, returns false 1398 /// otherwise. Loc is the location where this routine should point to 1399 /// if there is an error, and Range is the source range to highlight 1400 /// if there is an error. 1401 bool 1402 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1403 unsigned InaccessibleBaseID, 1404 unsigned AmbigiousBaseConvID, 1405 SourceLocation Loc, SourceRange Range, 1406 DeclarationName Name, 1407 CXXCastPath *BasePath) { 1408 // First, determine whether the path from Derived to Base is 1409 // ambiguous. This is slightly more expensive than checking whether 1410 // the Derived to Base conversion exists, because here we need to 1411 // explore multiple paths to determine if there is an ambiguity. 1412 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1413 /*DetectVirtual=*/false); 1414 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1415 assert(DerivationOkay && 1416 "Can only be used with a derived-to-base conversion"); 1417 (void)DerivationOkay; 1418 1419 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1420 if (InaccessibleBaseID) { 1421 // Check that the base class can be accessed. 1422 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1423 InaccessibleBaseID)) { 1424 case AR_inaccessible: 1425 return true; 1426 case AR_accessible: 1427 case AR_dependent: 1428 case AR_delayed: 1429 break; 1430 } 1431 } 1432 1433 // Build a base path if necessary. 1434 if (BasePath) 1435 BuildBasePathArray(Paths, *BasePath); 1436 return false; 1437 } 1438 1439 // We know that the derived-to-base conversion is ambiguous, and 1440 // we're going to produce a diagnostic. Perform the derived-to-base 1441 // search just one more time to compute all of the possible paths so 1442 // that we can print them out. This is more expensive than any of 1443 // the previous derived-to-base checks we've done, but at this point 1444 // performance isn't as much of an issue. 1445 Paths.clear(); 1446 Paths.setRecordingPaths(true); 1447 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1448 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1449 (void)StillOkay; 1450 1451 // Build up a textual representation of the ambiguous paths, e.g., 1452 // D -> B -> A, that will be used to illustrate the ambiguous 1453 // conversions in the diagnostic. We only print one of the paths 1454 // to each base class subobject. 1455 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1456 1457 Diag(Loc, AmbigiousBaseConvID) 1458 << Derived << Base << PathDisplayStr << Range << Name; 1459 return true; 1460 } 1461 1462 bool 1463 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1464 SourceLocation Loc, SourceRange Range, 1465 CXXCastPath *BasePath, 1466 bool IgnoreAccess) { 1467 return CheckDerivedToBaseConversion(Derived, Base, 1468 IgnoreAccess ? 0 1469 : diag::err_upcast_to_inaccessible_base, 1470 diag::err_ambiguous_derived_to_base_conv, 1471 Loc, Range, DeclarationName(), 1472 BasePath); 1473 } 1474 1475 1476 /// @brief Builds a string representing ambiguous paths from a 1477 /// specific derived class to different subobjects of the same base 1478 /// class. 1479 /// 1480 /// This function builds a string that can be used in error messages 1481 /// to show the different paths that one can take through the 1482 /// inheritance hierarchy to go from the derived class to different 1483 /// subobjects of a base class. The result looks something like this: 1484 /// @code 1485 /// struct D -> struct B -> struct A 1486 /// struct D -> struct C -> struct A 1487 /// @endcode 1488 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1489 std::string PathDisplayStr; 1490 std::set<unsigned> DisplayedPaths; 1491 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1492 Path != Paths.end(); ++Path) { 1493 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1494 // We haven't displayed a path to this particular base 1495 // class subobject yet. 1496 PathDisplayStr += "\n "; 1497 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1498 for (CXXBasePath::const_iterator Element = Path->begin(); 1499 Element != Path->end(); ++Element) 1500 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1501 } 1502 } 1503 1504 return PathDisplayStr; 1505 } 1506 1507 //===----------------------------------------------------------------------===// 1508 // C++ class member Handling 1509 //===----------------------------------------------------------------------===// 1510 1511 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1512 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1513 SourceLocation ASLoc, 1514 SourceLocation ColonLoc, 1515 AttributeList *Attrs) { 1516 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1517 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1518 ASLoc, ColonLoc); 1519 CurContext->addHiddenDecl(ASDecl); 1520 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1521 } 1522 1523 /// CheckOverrideControl - Check C++11 override control semantics. 1524 void Sema::CheckOverrideControl(Decl *D) { 1525 if (D->isInvalidDecl()) 1526 return; 1527 1528 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1529 1530 // Do we know which functions this declaration might be overriding? 1531 bool OverridesAreKnown = !MD || 1532 (!MD->getParent()->hasAnyDependentBases() && 1533 !MD->getType()->isDependentType()); 1534 1535 if (!MD || !MD->isVirtual()) { 1536 if (OverridesAreKnown) { 1537 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1538 Diag(OA->getLocation(), 1539 diag::override_keyword_only_allowed_on_virtual_member_functions) 1540 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1541 D->dropAttr<OverrideAttr>(); 1542 } 1543 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1544 Diag(FA->getLocation(), 1545 diag::override_keyword_only_allowed_on_virtual_member_functions) 1546 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1547 D->dropAttr<FinalAttr>(); 1548 } 1549 } 1550 return; 1551 } 1552 1553 if (!OverridesAreKnown) 1554 return; 1555 1556 // C++11 [class.virtual]p5: 1557 // If a virtual function is marked with the virt-specifier override and 1558 // does not override a member function of a base class, the program is 1559 // ill-formed. 1560 bool HasOverriddenMethods = 1561 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1562 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1563 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1564 << MD->getDeclName(); 1565 } 1566 1567 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1568 /// function overrides a virtual member function marked 'final', according to 1569 /// C++11 [class.virtual]p4. 1570 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1571 const CXXMethodDecl *Old) { 1572 if (!Old->hasAttr<FinalAttr>()) 1573 return false; 1574 1575 Diag(New->getLocation(), diag::err_final_function_overridden) 1576 << New->getDeclName(); 1577 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1578 return true; 1579 } 1580 1581 static bool InitializationHasSideEffects(const FieldDecl &FD) { 1582 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1583 // FIXME: Destruction of ObjC lifetime types has side-effects. 1584 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1585 return !RD->isCompleteDefinition() || 1586 !RD->hasTrivialDefaultConstructor() || 1587 !RD->hasTrivialDestructor(); 1588 return false; 1589 } 1590 1591 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1592 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1593 /// bitfield width if there is one, 'InitExpr' specifies the initializer if 1594 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1595 /// present (but parsing it has been deferred). 1596 NamedDecl * 1597 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1598 MultiTemplateParamsArg TemplateParameterLists, 1599 Expr *BW, const VirtSpecifiers &VS, 1600 InClassInitStyle InitStyle) { 1601 const DeclSpec &DS = D.getDeclSpec(); 1602 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1603 DeclarationName Name = NameInfo.getName(); 1604 SourceLocation Loc = NameInfo.getLoc(); 1605 1606 // For anonymous bitfields, the location should point to the type. 1607 if (Loc.isInvalid()) 1608 Loc = D.getLocStart(); 1609 1610 Expr *BitWidth = static_cast<Expr*>(BW); 1611 1612 assert(isa<CXXRecordDecl>(CurContext)); 1613 assert(!DS.isFriendSpecified()); 1614 1615 bool isFunc = D.isDeclarationOfFunction(); 1616 1617 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1618 // The Microsoft extension __interface only permits public member functions 1619 // and prohibits constructors, destructors, operators, non-public member 1620 // functions, static methods and data members. 1621 unsigned InvalidDecl; 1622 bool ShowDeclName = true; 1623 if (!isFunc) 1624 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1625 else if (AS != AS_public) 1626 InvalidDecl = 2; 1627 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1628 InvalidDecl = 3; 1629 else switch (Name.getNameKind()) { 1630 case DeclarationName::CXXConstructorName: 1631 InvalidDecl = 4; 1632 ShowDeclName = false; 1633 break; 1634 1635 case DeclarationName::CXXDestructorName: 1636 InvalidDecl = 5; 1637 ShowDeclName = false; 1638 break; 1639 1640 case DeclarationName::CXXOperatorName: 1641 case DeclarationName::CXXConversionFunctionName: 1642 InvalidDecl = 6; 1643 break; 1644 1645 default: 1646 InvalidDecl = 0; 1647 break; 1648 } 1649 1650 if (InvalidDecl) { 1651 if (ShowDeclName) 1652 Diag(Loc, diag::err_invalid_member_in_interface) 1653 << (InvalidDecl-1) << Name; 1654 else 1655 Diag(Loc, diag::err_invalid_member_in_interface) 1656 << (InvalidDecl-1) << ""; 1657 return 0; 1658 } 1659 } 1660 1661 // C++ 9.2p6: A member shall not be declared to have automatic storage 1662 // duration (auto, register) or with the extern storage-class-specifier. 1663 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1664 // data members and cannot be applied to names declared const or static, 1665 // and cannot be applied to reference members. 1666 switch (DS.getStorageClassSpec()) { 1667 case DeclSpec::SCS_unspecified: 1668 case DeclSpec::SCS_typedef: 1669 case DeclSpec::SCS_static: 1670 // FALL THROUGH. 1671 break; 1672 case DeclSpec::SCS_mutable: 1673 if (isFunc) { 1674 if (DS.getStorageClassSpecLoc().isValid()) 1675 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1676 else 1677 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1678 1679 // FIXME: It would be nicer if the keyword was ignored only for this 1680 // declarator. Otherwise we could get follow-up errors. 1681 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1682 } 1683 break; 1684 default: 1685 if (DS.getStorageClassSpecLoc().isValid()) 1686 Diag(DS.getStorageClassSpecLoc(), 1687 diag::err_storageclass_invalid_for_member); 1688 else 1689 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1690 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1691 } 1692 1693 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1694 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1695 !isFunc); 1696 1697 if (DS.isConstexprSpecified() && isInstField) { 1698 SemaDiagnosticBuilder B = 1699 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1700 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1701 if (InitStyle == ICIS_NoInit) { 1702 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1703 D.getMutableDeclSpec().ClearConstexprSpec(); 1704 const char *PrevSpec; 1705 unsigned DiagID; 1706 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1707 PrevSpec, DiagID, getLangOpts()); 1708 (void)Failed; 1709 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1710 } else { 1711 B << 1; 1712 const char *PrevSpec; 1713 unsigned DiagID; 1714 if (D.getMutableDeclSpec().SetStorageClassSpec( 1715 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1716 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1717 "This is the only DeclSpec that should fail to be applied"); 1718 B << 1; 1719 } else { 1720 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1721 isInstField = false; 1722 } 1723 } 1724 } 1725 1726 NamedDecl *Member; 1727 if (isInstField) { 1728 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1729 1730 // Data members must have identifiers for names. 1731 if (!Name.isIdentifier()) { 1732 Diag(Loc, diag::err_bad_variable_name) 1733 << Name; 1734 return 0; 1735 } 1736 1737 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1738 1739 // Member field could not be with "template" keyword. 1740 // So TemplateParameterLists should be empty in this case. 1741 if (TemplateParameterLists.size()) { 1742 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1743 if (TemplateParams->size()) { 1744 // There is no such thing as a member field template. 1745 Diag(D.getIdentifierLoc(), diag::err_template_member) 1746 << II 1747 << SourceRange(TemplateParams->getTemplateLoc(), 1748 TemplateParams->getRAngleLoc()); 1749 } else { 1750 // There is an extraneous 'template<>' for this member. 1751 Diag(TemplateParams->getTemplateLoc(), 1752 diag::err_template_member_noparams) 1753 << II 1754 << SourceRange(TemplateParams->getTemplateLoc(), 1755 TemplateParams->getRAngleLoc()); 1756 } 1757 return 0; 1758 } 1759 1760 if (SS.isSet() && !SS.isInvalid()) { 1761 // The user provided a superfluous scope specifier inside a class 1762 // definition: 1763 // 1764 // class X { 1765 // int X::member; 1766 // }; 1767 if (DeclContext *DC = computeDeclContext(SS, false)) 1768 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1769 else 1770 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1771 << Name << SS.getRange(); 1772 1773 SS.clear(); 1774 } 1775 1776 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1777 InitStyle, AS); 1778 assert(Member && "HandleField never returns null"); 1779 } else { 1780 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1781 1782 Member = HandleDeclarator(S, D, TemplateParameterLists); 1783 if (!Member) { 1784 return 0; 1785 } 1786 1787 // Non-instance-fields can't have a bitfield. 1788 if (BitWidth) { 1789 if (Member->isInvalidDecl()) { 1790 // don't emit another diagnostic. 1791 } else if (isa<VarDecl>(Member)) { 1792 // C++ 9.6p3: A bit-field shall not be a static member. 1793 // "static member 'A' cannot be a bit-field" 1794 Diag(Loc, diag::err_static_not_bitfield) 1795 << Name << BitWidth->getSourceRange(); 1796 } else if (isa<TypedefDecl>(Member)) { 1797 // "typedef member 'x' cannot be a bit-field" 1798 Diag(Loc, diag::err_typedef_not_bitfield) 1799 << Name << BitWidth->getSourceRange(); 1800 } else { 1801 // A function typedef ("typedef int f(); f a;"). 1802 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1803 Diag(Loc, diag::err_not_integral_type_bitfield) 1804 << Name << cast<ValueDecl>(Member)->getType() 1805 << BitWidth->getSourceRange(); 1806 } 1807 1808 BitWidth = 0; 1809 Member->setInvalidDecl(); 1810 } 1811 1812 Member->setAccess(AS); 1813 1814 // If we have declared a member function template, set the access of the 1815 // templated declaration as well. 1816 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1817 FunTmpl->getTemplatedDecl()->setAccess(AS); 1818 } 1819 1820 if (VS.isOverrideSpecified()) 1821 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1822 if (VS.isFinalSpecified()) 1823 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1824 1825 if (VS.getLastLocation().isValid()) { 1826 // Update the end location of a method that has a virt-specifiers. 1827 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1828 MD->setRangeEnd(VS.getLastLocation()); 1829 } 1830 1831 CheckOverrideControl(Member); 1832 1833 assert((Name || isInstField) && "No identifier for non-field ?"); 1834 1835 if (isInstField) { 1836 FieldDecl *FD = cast<FieldDecl>(Member); 1837 FieldCollector->Add(FD); 1838 1839 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1840 FD->getLocation()) 1841 != DiagnosticsEngine::Ignored) { 1842 // Remember all explicit private FieldDecls that have a name, no side 1843 // effects and are not part of a dependent type declaration. 1844 if (!FD->isImplicit() && FD->getDeclName() && 1845 FD->getAccess() == AS_private && 1846 !FD->hasAttr<UnusedAttr>() && 1847 !FD->getParent()->isDependentContext() && 1848 !InitializationHasSideEffects(*FD)) 1849 UnusedPrivateFields.insert(FD); 1850 } 1851 } 1852 1853 return Member; 1854 } 1855 1856 namespace { 1857 class UninitializedFieldVisitor 1858 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1859 Sema &S; 1860 ValueDecl *VD; 1861 public: 1862 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1863 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1864 S(S) { 1865 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1866 this->VD = IFD->getAnonField(); 1867 else 1868 this->VD = VD; 1869 } 1870 1871 void HandleExpr(Expr *E) { 1872 if (!E) return; 1873 1874 // Expressions like x(x) sometimes lack the surrounding expressions 1875 // but need to be checked anyways. 1876 HandleValue(E); 1877 Visit(E); 1878 } 1879 1880 void HandleValue(Expr *E) { 1881 E = E->IgnoreParens(); 1882 1883 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1884 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1885 return; 1886 1887 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1888 // or union. 1889 MemberExpr *FieldME = ME; 1890 1891 Expr *Base = E; 1892 while (isa<MemberExpr>(Base)) { 1893 ME = cast<MemberExpr>(Base); 1894 1895 if (isa<VarDecl>(ME->getMemberDecl())) 1896 return; 1897 1898 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1899 if (!FD->isAnonymousStructOrUnion()) 1900 FieldME = ME; 1901 1902 Base = ME->getBase(); 1903 } 1904 1905 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1906 unsigned diag = VD->getType()->isReferenceType() 1907 ? diag::warn_reference_field_is_uninit 1908 : diag::warn_field_is_uninit; 1909 S.Diag(FieldME->getExprLoc(), diag) << VD; 1910 } 1911 return; 1912 } 1913 1914 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1915 HandleValue(CO->getTrueExpr()); 1916 HandleValue(CO->getFalseExpr()); 1917 return; 1918 } 1919 1920 if (BinaryConditionalOperator *BCO = 1921 dyn_cast<BinaryConditionalOperator>(E)) { 1922 HandleValue(BCO->getCommon()); 1923 HandleValue(BCO->getFalseExpr()); 1924 return; 1925 } 1926 1927 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1928 switch (BO->getOpcode()) { 1929 default: 1930 return; 1931 case(BO_PtrMemD): 1932 case(BO_PtrMemI): 1933 HandleValue(BO->getLHS()); 1934 return; 1935 case(BO_Comma): 1936 HandleValue(BO->getRHS()); 1937 return; 1938 } 1939 } 1940 } 1941 1942 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1943 if (E->getCastKind() == CK_LValueToRValue) 1944 HandleValue(E->getSubExpr()); 1945 1946 Inherited::VisitImplicitCastExpr(E); 1947 } 1948 1949 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1950 Expr *Callee = E->getCallee(); 1951 if (isa<MemberExpr>(Callee)) 1952 HandleValue(Callee); 1953 1954 Inherited::VisitCXXMemberCallExpr(E); 1955 } 1956 }; 1957 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1958 ValueDecl *VD) { 1959 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1960 } 1961 } // namespace 1962 1963 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1964 /// in-class initializer for a non-static C++ class member, and after 1965 /// instantiating an in-class initializer in a class template. Such actions 1966 /// are deferred until the class is complete. 1967 void 1968 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1969 Expr *InitExpr) { 1970 FieldDecl *FD = cast<FieldDecl>(D); 1971 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1972 "must set init style when field is created"); 1973 1974 if (!InitExpr) { 1975 FD->setInvalidDecl(); 1976 FD->removeInClassInitializer(); 1977 return; 1978 } 1979 1980 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1981 FD->setInvalidDecl(); 1982 FD->removeInClassInitializer(); 1983 return; 1984 } 1985 1986 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1987 != DiagnosticsEngine::Ignored) { 1988 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1989 } 1990 1991 ExprResult Init = InitExpr; 1992 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1993 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1994 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1995 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1996 } 1997 Expr **Inits = &InitExpr; 1998 unsigned NumInits = 1; 1999 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2000 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2001 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2002 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2003 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 2004 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 2005 if (Init.isInvalid()) { 2006 FD->setInvalidDecl(); 2007 return; 2008 } 2009 } 2010 2011 // C++11 [class.base.init]p7: 2012 // The initialization of each base and member constitutes a 2013 // full-expression. 2014 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2015 if (Init.isInvalid()) { 2016 FD->setInvalidDecl(); 2017 return; 2018 } 2019 2020 InitExpr = Init.release(); 2021 2022 FD->setInClassInitializer(InitExpr); 2023 } 2024 2025 /// \brief Find the direct and/or virtual base specifiers that 2026 /// correspond to the given base type, for use in base initialization 2027 /// within a constructor. 2028 static bool FindBaseInitializer(Sema &SemaRef, 2029 CXXRecordDecl *ClassDecl, 2030 QualType BaseType, 2031 const CXXBaseSpecifier *&DirectBaseSpec, 2032 const CXXBaseSpecifier *&VirtualBaseSpec) { 2033 // First, check for a direct base class. 2034 DirectBaseSpec = 0; 2035 for (CXXRecordDecl::base_class_const_iterator Base 2036 = ClassDecl->bases_begin(); 2037 Base != ClassDecl->bases_end(); ++Base) { 2038 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2039 // We found a direct base of this type. That's what we're 2040 // initializing. 2041 DirectBaseSpec = &*Base; 2042 break; 2043 } 2044 } 2045 2046 // Check for a virtual base class. 2047 // FIXME: We might be able to short-circuit this if we know in advance that 2048 // there are no virtual bases. 2049 VirtualBaseSpec = 0; 2050 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2051 // We haven't found a base yet; search the class hierarchy for a 2052 // virtual base class. 2053 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2054 /*DetectVirtual=*/false); 2055 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2056 BaseType, Paths)) { 2057 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2058 Path != Paths.end(); ++Path) { 2059 if (Path->back().Base->isVirtual()) { 2060 VirtualBaseSpec = Path->back().Base; 2061 break; 2062 } 2063 } 2064 } 2065 } 2066 2067 return DirectBaseSpec || VirtualBaseSpec; 2068 } 2069 2070 /// \brief Handle a C++ member initializer using braced-init-list syntax. 2071 MemInitResult 2072 Sema::ActOnMemInitializer(Decl *ConstructorD, 2073 Scope *S, 2074 CXXScopeSpec &SS, 2075 IdentifierInfo *MemberOrBase, 2076 ParsedType TemplateTypeTy, 2077 const DeclSpec &DS, 2078 SourceLocation IdLoc, 2079 Expr *InitList, 2080 SourceLocation EllipsisLoc) { 2081 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2082 DS, IdLoc, InitList, 2083 EllipsisLoc); 2084 } 2085 2086 /// \brief Handle a C++ member initializer using parentheses syntax. 2087 MemInitResult 2088 Sema::ActOnMemInitializer(Decl *ConstructorD, 2089 Scope *S, 2090 CXXScopeSpec &SS, 2091 IdentifierInfo *MemberOrBase, 2092 ParsedType TemplateTypeTy, 2093 const DeclSpec &DS, 2094 SourceLocation IdLoc, 2095 SourceLocation LParenLoc, 2096 Expr **Args, unsigned NumArgs, 2097 SourceLocation RParenLoc, 2098 SourceLocation EllipsisLoc) { 2099 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2100 llvm::makeArrayRef(Args, NumArgs), 2101 RParenLoc); 2102 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2103 DS, IdLoc, List, EllipsisLoc); 2104 } 2105 2106 namespace { 2107 2108 // Callback to only accept typo corrections that can be a valid C++ member 2109 // intializer: either a non-static field member or a base class. 2110 class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2111 public: 2112 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2113 : ClassDecl(ClassDecl) {} 2114 2115 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2116 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2117 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2118 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2119 else 2120 return isa<TypeDecl>(ND); 2121 } 2122 return false; 2123 } 2124 2125 private: 2126 CXXRecordDecl *ClassDecl; 2127 }; 2128 2129 } 2130 2131 /// \brief Handle a C++ member initializer. 2132 MemInitResult 2133 Sema::BuildMemInitializer(Decl *ConstructorD, 2134 Scope *S, 2135 CXXScopeSpec &SS, 2136 IdentifierInfo *MemberOrBase, 2137 ParsedType TemplateTypeTy, 2138 const DeclSpec &DS, 2139 SourceLocation IdLoc, 2140 Expr *Init, 2141 SourceLocation EllipsisLoc) { 2142 if (!ConstructorD) 2143 return true; 2144 2145 AdjustDeclIfTemplate(ConstructorD); 2146 2147 CXXConstructorDecl *Constructor 2148 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2149 if (!Constructor) { 2150 // The user wrote a constructor initializer on a function that is 2151 // not a C++ constructor. Ignore the error for now, because we may 2152 // have more member initializers coming; we'll diagnose it just 2153 // once in ActOnMemInitializers. 2154 return true; 2155 } 2156 2157 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2158 2159 // C++ [class.base.init]p2: 2160 // Names in a mem-initializer-id are looked up in the scope of the 2161 // constructor's class and, if not found in that scope, are looked 2162 // up in the scope containing the constructor's definition. 2163 // [Note: if the constructor's class contains a member with the 2164 // same name as a direct or virtual base class of the class, a 2165 // mem-initializer-id naming the member or base class and composed 2166 // of a single identifier refers to the class member. A 2167 // mem-initializer-id for the hidden base class may be specified 2168 // using a qualified name. ] 2169 if (!SS.getScopeRep() && !TemplateTypeTy) { 2170 // Look for a member, first. 2171 DeclContext::lookup_result Result 2172 = ClassDecl->lookup(MemberOrBase); 2173 if (!Result.empty()) { 2174 ValueDecl *Member; 2175 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2176 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2177 if (EllipsisLoc.isValid()) 2178 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2179 << MemberOrBase 2180 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2181 2182 return BuildMemberInitializer(Member, Init, IdLoc); 2183 } 2184 } 2185 } 2186 // It didn't name a member, so see if it names a class. 2187 QualType BaseType; 2188 TypeSourceInfo *TInfo = 0; 2189 2190 if (TemplateTypeTy) { 2191 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2192 } else if (DS.getTypeSpecType() == TST_decltype) { 2193 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2194 } else { 2195 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2196 LookupParsedName(R, S, &SS); 2197 2198 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2199 if (!TyD) { 2200 if (R.isAmbiguous()) return true; 2201 2202 // We don't want access-control diagnostics here. 2203 R.suppressDiagnostics(); 2204 2205 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2206 bool NotUnknownSpecialization = false; 2207 DeclContext *DC = computeDeclContext(SS, false); 2208 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2209 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2210 2211 if (!NotUnknownSpecialization) { 2212 // When the scope specifier can refer to a member of an unknown 2213 // specialization, we take it as a type name. 2214 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2215 SS.getWithLocInContext(Context), 2216 *MemberOrBase, IdLoc); 2217 if (BaseType.isNull()) 2218 return true; 2219 2220 R.clear(); 2221 R.setLookupName(MemberOrBase); 2222 } 2223 } 2224 2225 // If no results were found, try to correct typos. 2226 TypoCorrection Corr; 2227 MemInitializerValidatorCCC Validator(ClassDecl); 2228 if (R.empty() && BaseType.isNull() && 2229 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2230 Validator, ClassDecl))) { 2231 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2232 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2233 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2234 // We have found a non-static data member with a similar 2235 // name to what was typed; complain and initialize that 2236 // member. 2237 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2238 << MemberOrBase << true << CorrectedQuotedStr 2239 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2240 Diag(Member->getLocation(), diag::note_previous_decl) 2241 << CorrectedQuotedStr; 2242 2243 return BuildMemberInitializer(Member, Init, IdLoc); 2244 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2245 const CXXBaseSpecifier *DirectBaseSpec; 2246 const CXXBaseSpecifier *VirtualBaseSpec; 2247 if (FindBaseInitializer(*this, ClassDecl, 2248 Context.getTypeDeclType(Type), 2249 DirectBaseSpec, VirtualBaseSpec)) { 2250 // We have found a direct or virtual base class with a 2251 // similar name to what was typed; complain and initialize 2252 // that base class. 2253 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2254 << MemberOrBase << false << CorrectedQuotedStr 2255 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2256 2257 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2258 : VirtualBaseSpec; 2259 Diag(BaseSpec->getLocStart(), 2260 diag::note_base_class_specified_here) 2261 << BaseSpec->getType() 2262 << BaseSpec->getSourceRange(); 2263 2264 TyD = Type; 2265 } 2266 } 2267 } 2268 2269 if (!TyD && BaseType.isNull()) { 2270 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2271 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2272 return true; 2273 } 2274 } 2275 2276 if (BaseType.isNull()) { 2277 BaseType = Context.getTypeDeclType(TyD); 2278 if (SS.isSet()) { 2279 NestedNameSpecifier *Qualifier = 2280 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2281 2282 // FIXME: preserve source range information 2283 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2284 } 2285 } 2286 } 2287 2288 if (!TInfo) 2289 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2290 2291 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2292 } 2293 2294 /// Checks a member initializer expression for cases where reference (or 2295 /// pointer) members are bound to by-value parameters (or their addresses). 2296 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2297 Expr *Init, 2298 SourceLocation IdLoc) { 2299 QualType MemberTy = Member->getType(); 2300 2301 // We only handle pointers and references currently. 2302 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2303 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2304 return; 2305 2306 const bool IsPointer = MemberTy->isPointerType(); 2307 if (IsPointer) { 2308 if (const UnaryOperator *Op 2309 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2310 // The only case we're worried about with pointers requires taking the 2311 // address. 2312 if (Op->getOpcode() != UO_AddrOf) 2313 return; 2314 2315 Init = Op->getSubExpr(); 2316 } else { 2317 // We only handle address-of expression initializers for pointers. 2318 return; 2319 } 2320 } 2321 2322 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2323 // Taking the address of a temporary will be diagnosed as a hard error. 2324 if (IsPointer) 2325 return; 2326 2327 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2328 << Member << Init->getSourceRange(); 2329 } else if (const DeclRefExpr *DRE 2330 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2331 // We only warn when referring to a non-reference parameter declaration. 2332 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2333 if (!Parameter || Parameter->getType()->isReferenceType()) 2334 return; 2335 2336 S.Diag(Init->getExprLoc(), 2337 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2338 : diag::warn_bind_ref_member_to_parameter) 2339 << Member << Parameter << Init->getSourceRange(); 2340 } else { 2341 // Other initializers are fine. 2342 return; 2343 } 2344 2345 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2346 << (unsigned)IsPointer; 2347 } 2348 2349 MemInitResult 2350 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2351 SourceLocation IdLoc) { 2352 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2353 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2354 assert((DirectMember || IndirectMember) && 2355 "Member must be a FieldDecl or IndirectFieldDecl"); 2356 2357 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2358 return true; 2359 2360 if (Member->isInvalidDecl()) 2361 return true; 2362 2363 // Diagnose value-uses of fields to initialize themselves, e.g. 2364 // foo(foo) 2365 // where foo is not also a parameter to the constructor. 2366 // TODO: implement -Wuninitialized and fold this into that framework. 2367 Expr **Args; 2368 unsigned NumArgs; 2369 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2370 Args = ParenList->getExprs(); 2371 NumArgs = ParenList->getNumExprs(); 2372 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2373 Args = InitList->getInits(); 2374 NumArgs = InitList->getNumInits(); 2375 } else { 2376 // Template instantiation doesn't reconstruct ParenListExprs for us. 2377 Args = &Init; 2378 NumArgs = 1; 2379 } 2380 2381 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2382 != DiagnosticsEngine::Ignored) 2383 for (unsigned i = 0; i < NumArgs; ++i) 2384 // FIXME: Warn about the case when other fields are used before being 2385 // initialized. For example, let this field be the i'th field. When 2386 // initializing the i'th field, throw a warning if any of the >= i'th 2387 // fields are used, as they are not yet initialized. 2388 // Right now we are only handling the case where the i'th field uses 2389 // itself in its initializer. 2390 // Also need to take into account that some fields may be initialized by 2391 // in-class initializers, see C++11 [class.base.init]p9. 2392 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2393 2394 SourceRange InitRange = Init->getSourceRange(); 2395 2396 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2397 // Can't check initialization for a member of dependent type or when 2398 // any of the arguments are type-dependent expressions. 2399 DiscardCleanupsInEvaluationContext(); 2400 } else { 2401 bool InitList = false; 2402 if (isa<InitListExpr>(Init)) { 2403 InitList = true; 2404 Args = &Init; 2405 NumArgs = 1; 2406 2407 if (isStdInitializerList(Member->getType(), 0)) { 2408 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2409 << /*at end of ctor*/1 << InitRange; 2410 } 2411 } 2412 2413 // Initialize the member. 2414 InitializedEntity MemberEntity = 2415 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2416 : InitializedEntity::InitializeMember(IndirectMember, 0); 2417 InitializationKind Kind = 2418 InitList ? InitializationKind::CreateDirectList(IdLoc) 2419 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2420 InitRange.getEnd()); 2421 2422 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2423 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2424 MultiExprArg(Args, NumArgs), 2425 0); 2426 if (MemberInit.isInvalid()) 2427 return true; 2428 2429 // C++11 [class.base.init]p7: 2430 // The initialization of each base and member constitutes a 2431 // full-expression. 2432 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2433 if (MemberInit.isInvalid()) 2434 return true; 2435 2436 Init = MemberInit.get(); 2437 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2438 } 2439 2440 if (DirectMember) { 2441 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2442 InitRange.getBegin(), Init, 2443 InitRange.getEnd()); 2444 } else { 2445 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2446 InitRange.getBegin(), Init, 2447 InitRange.getEnd()); 2448 } 2449 } 2450 2451 MemInitResult 2452 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2453 CXXRecordDecl *ClassDecl) { 2454 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2455 if (!LangOpts.CPlusPlus11) 2456 return Diag(NameLoc, diag::err_delegating_ctor) 2457 << TInfo->getTypeLoc().getLocalSourceRange(); 2458 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2459 2460 bool InitList = true; 2461 Expr **Args = &Init; 2462 unsigned NumArgs = 1; 2463 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2464 InitList = false; 2465 Args = ParenList->getExprs(); 2466 NumArgs = ParenList->getNumExprs(); 2467 } 2468 2469 SourceRange InitRange = Init->getSourceRange(); 2470 // Initialize the object. 2471 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2472 QualType(ClassDecl->getTypeForDecl(), 0)); 2473 InitializationKind Kind = 2474 InitList ? InitializationKind::CreateDirectList(NameLoc) 2475 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2476 InitRange.getEnd()); 2477 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2478 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2479 MultiExprArg(Args, NumArgs), 2480 0); 2481 if (DelegationInit.isInvalid()) 2482 return true; 2483 2484 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2485 "Delegating constructor with no target?"); 2486 2487 // C++11 [class.base.init]p7: 2488 // The initialization of each base and member constitutes a 2489 // full-expression. 2490 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2491 InitRange.getBegin()); 2492 if (DelegationInit.isInvalid()) 2493 return true; 2494 2495 // If we are in a dependent context, template instantiation will 2496 // perform this type-checking again. Just save the arguments that we 2497 // received in a ParenListExpr. 2498 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2499 // of the information that we have about the base 2500 // initializer. However, deconstructing the ASTs is a dicey process, 2501 // and this approach is far more likely to get the corner cases right. 2502 if (CurContext->isDependentContext()) 2503 DelegationInit = Owned(Init); 2504 2505 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2506 DelegationInit.takeAs<Expr>(), 2507 InitRange.getEnd()); 2508 } 2509 2510 MemInitResult 2511 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2512 Expr *Init, CXXRecordDecl *ClassDecl, 2513 SourceLocation EllipsisLoc) { 2514 SourceLocation BaseLoc 2515 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2516 2517 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2518 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2519 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2520 2521 // C++ [class.base.init]p2: 2522 // [...] Unless the mem-initializer-id names a nonstatic data 2523 // member of the constructor's class or a direct or virtual base 2524 // of that class, the mem-initializer is ill-formed. A 2525 // mem-initializer-list can initialize a base class using any 2526 // name that denotes that base class type. 2527 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2528 2529 SourceRange InitRange = Init->getSourceRange(); 2530 if (EllipsisLoc.isValid()) { 2531 // This is a pack expansion. 2532 if (!BaseType->containsUnexpandedParameterPack()) { 2533 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2534 << SourceRange(BaseLoc, InitRange.getEnd()); 2535 2536 EllipsisLoc = SourceLocation(); 2537 } 2538 } else { 2539 // Check for any unexpanded parameter packs. 2540 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2541 return true; 2542 2543 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2544 return true; 2545 } 2546 2547 // Check for direct and virtual base classes. 2548 const CXXBaseSpecifier *DirectBaseSpec = 0; 2549 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2550 if (!Dependent) { 2551 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2552 BaseType)) 2553 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2554 2555 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2556 VirtualBaseSpec); 2557 2558 // C++ [base.class.init]p2: 2559 // Unless the mem-initializer-id names a nonstatic data member of the 2560 // constructor's class or a direct or virtual base of that class, the 2561 // mem-initializer is ill-formed. 2562 if (!DirectBaseSpec && !VirtualBaseSpec) { 2563 // If the class has any dependent bases, then it's possible that 2564 // one of those types will resolve to the same type as 2565 // BaseType. Therefore, just treat this as a dependent base 2566 // class initialization. FIXME: Should we try to check the 2567 // initialization anyway? It seems odd. 2568 if (ClassDecl->hasAnyDependentBases()) 2569 Dependent = true; 2570 else 2571 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2572 << BaseType << Context.getTypeDeclType(ClassDecl) 2573 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2574 } 2575 } 2576 2577 if (Dependent) { 2578 DiscardCleanupsInEvaluationContext(); 2579 2580 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2581 /*IsVirtual=*/false, 2582 InitRange.getBegin(), Init, 2583 InitRange.getEnd(), EllipsisLoc); 2584 } 2585 2586 // C++ [base.class.init]p2: 2587 // If a mem-initializer-id is ambiguous because it designates both 2588 // a direct non-virtual base class and an inherited virtual base 2589 // class, the mem-initializer is ill-formed. 2590 if (DirectBaseSpec && VirtualBaseSpec) 2591 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2592 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2593 2594 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2595 if (!BaseSpec) 2596 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2597 2598 // Initialize the base. 2599 bool InitList = true; 2600 Expr **Args = &Init; 2601 unsigned NumArgs = 1; 2602 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2603 InitList = false; 2604 Args = ParenList->getExprs(); 2605 NumArgs = ParenList->getNumExprs(); 2606 } 2607 2608 InitializedEntity BaseEntity = 2609 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2610 InitializationKind Kind = 2611 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2612 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2613 InitRange.getEnd()); 2614 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2615 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2616 MultiExprArg(Args, NumArgs), 0); 2617 if (BaseInit.isInvalid()) 2618 return true; 2619 2620 // C++11 [class.base.init]p7: 2621 // The initialization of each base and member constitutes a 2622 // full-expression. 2623 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2624 if (BaseInit.isInvalid()) 2625 return true; 2626 2627 // If we are in a dependent context, template instantiation will 2628 // perform this type-checking again. Just save the arguments that we 2629 // received in a ParenListExpr. 2630 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2631 // of the information that we have about the base 2632 // initializer. However, deconstructing the ASTs is a dicey process, 2633 // and this approach is far more likely to get the corner cases right. 2634 if (CurContext->isDependentContext()) 2635 BaseInit = Owned(Init); 2636 2637 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2638 BaseSpec->isVirtual(), 2639 InitRange.getBegin(), 2640 BaseInit.takeAs<Expr>(), 2641 InitRange.getEnd(), EllipsisLoc); 2642 } 2643 2644 // Create a static_cast\<T&&>(expr). 2645 static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2646 if (T.isNull()) T = E->getType(); 2647 QualType TargetType = SemaRef.BuildReferenceType( 2648 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2649 SourceLocation ExprLoc = E->getLocStart(); 2650 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2651 TargetType, ExprLoc); 2652 2653 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2654 SourceRange(ExprLoc, ExprLoc), 2655 E->getSourceRange()).take(); 2656 } 2657 2658 /// ImplicitInitializerKind - How an implicit base or member initializer should 2659 /// initialize its base or member. 2660 enum ImplicitInitializerKind { 2661 IIK_Default, 2662 IIK_Copy, 2663 IIK_Move, 2664 IIK_Inherit 2665 }; 2666 2667 static bool 2668 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2669 ImplicitInitializerKind ImplicitInitKind, 2670 CXXBaseSpecifier *BaseSpec, 2671 bool IsInheritedVirtualBase, 2672 CXXCtorInitializer *&CXXBaseInit) { 2673 InitializedEntity InitEntity 2674 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2675 IsInheritedVirtualBase); 2676 2677 ExprResult BaseInit; 2678 2679 switch (ImplicitInitKind) { 2680 case IIK_Inherit: { 2681 const CXXRecordDecl *Inherited = 2682 Constructor->getInheritedConstructor()->getParent(); 2683 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2684 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2685 // C++11 [class.inhctor]p8: 2686 // Each expression in the expression-list is of the form 2687 // static_cast<T&&>(p), where p is the name of the corresponding 2688 // constructor parameter and T is the declared type of p. 2689 SmallVector<Expr*, 16> Args; 2690 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2691 ParmVarDecl *PD = Constructor->getParamDecl(I); 2692 ExprResult ArgExpr = 2693 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2694 VK_LValue, SourceLocation()); 2695 if (ArgExpr.isInvalid()) 2696 return true; 2697 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2698 } 2699 2700 InitializationKind InitKind = InitializationKind::CreateDirect( 2701 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2702 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2703 Args.data(), Args.size()); 2704 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2705 break; 2706 } 2707 } 2708 // Fall through. 2709 case IIK_Default: { 2710 InitializationKind InitKind 2711 = InitializationKind::CreateDefault(Constructor->getLocation()); 2712 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2713 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2714 break; 2715 } 2716 2717 case IIK_Move: 2718 case IIK_Copy: { 2719 bool Moving = ImplicitInitKind == IIK_Move; 2720 ParmVarDecl *Param = Constructor->getParamDecl(0); 2721 QualType ParamType = Param->getType().getNonReferenceType(); 2722 2723 Expr *CopyCtorArg = 2724 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2725 SourceLocation(), Param, false, 2726 Constructor->getLocation(), ParamType, 2727 VK_LValue, 0); 2728 2729 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2730 2731 // Cast to the base class to avoid ambiguities. 2732 QualType ArgTy = 2733 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2734 ParamType.getQualifiers()); 2735 2736 if (Moving) { 2737 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2738 } 2739 2740 CXXCastPath BasePath; 2741 BasePath.push_back(BaseSpec); 2742 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2743 CK_UncheckedDerivedToBase, 2744 Moving ? VK_XValue : VK_LValue, 2745 &BasePath).take(); 2746 2747 InitializationKind InitKind 2748 = InitializationKind::CreateDirect(Constructor->getLocation(), 2749 SourceLocation(), SourceLocation()); 2750 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2751 &CopyCtorArg, 1); 2752 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2753 MultiExprArg(&CopyCtorArg, 1)); 2754 break; 2755 } 2756 } 2757 2758 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2759 if (BaseInit.isInvalid()) 2760 return true; 2761 2762 CXXBaseInit = 2763 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2764 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2765 SourceLocation()), 2766 BaseSpec->isVirtual(), 2767 SourceLocation(), 2768 BaseInit.takeAs<Expr>(), 2769 SourceLocation(), 2770 SourceLocation()); 2771 2772 return false; 2773 } 2774 2775 static bool RefersToRValueRef(Expr *MemRef) { 2776 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2777 return Referenced->getType()->isRValueReferenceType(); 2778 } 2779 2780 static bool 2781 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2782 ImplicitInitializerKind ImplicitInitKind, 2783 FieldDecl *Field, IndirectFieldDecl *Indirect, 2784 CXXCtorInitializer *&CXXMemberInit) { 2785 if (Field->isInvalidDecl()) 2786 return true; 2787 2788 SourceLocation Loc = Constructor->getLocation(); 2789 2790 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2791 bool Moving = ImplicitInitKind == IIK_Move; 2792 ParmVarDecl *Param = Constructor->getParamDecl(0); 2793 QualType ParamType = Param->getType().getNonReferenceType(); 2794 2795 // Suppress copying zero-width bitfields. 2796 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2797 return false; 2798 2799 Expr *MemberExprBase = 2800 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2801 SourceLocation(), Param, false, 2802 Loc, ParamType, VK_LValue, 0); 2803 2804 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2805 2806 if (Moving) { 2807 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2808 } 2809 2810 // Build a reference to this field within the parameter. 2811 CXXScopeSpec SS; 2812 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2813 Sema::LookupMemberName); 2814 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2815 : cast<ValueDecl>(Field), AS_public); 2816 MemberLookup.resolveKind(); 2817 ExprResult CtorArg 2818 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2819 ParamType, Loc, 2820 /*IsArrow=*/false, 2821 SS, 2822 /*TemplateKWLoc=*/SourceLocation(), 2823 /*FirstQualifierInScope=*/0, 2824 MemberLookup, 2825 /*TemplateArgs=*/0); 2826 if (CtorArg.isInvalid()) 2827 return true; 2828 2829 // C++11 [class.copy]p15: 2830 // - if a member m has rvalue reference type T&&, it is direct-initialized 2831 // with static_cast<T&&>(x.m); 2832 if (RefersToRValueRef(CtorArg.get())) { 2833 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2834 } 2835 2836 // When the field we are copying is an array, create index variables for 2837 // each dimension of the array. We use these index variables to subscript 2838 // the source array, and other clients (e.g., CodeGen) will perform the 2839 // necessary iteration with these index variables. 2840 SmallVector<VarDecl *, 4> IndexVariables; 2841 QualType BaseType = Field->getType(); 2842 QualType SizeType = SemaRef.Context.getSizeType(); 2843 bool InitializingArray = false; 2844 while (const ConstantArrayType *Array 2845 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2846 InitializingArray = true; 2847 // Create the iteration variable for this array index. 2848 IdentifierInfo *IterationVarName = 0; 2849 { 2850 SmallString<8> Str; 2851 llvm::raw_svector_ostream OS(Str); 2852 OS << "__i" << IndexVariables.size(); 2853 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2854 } 2855 VarDecl *IterationVar 2856 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2857 IterationVarName, SizeType, 2858 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2859 SC_None, SC_None); 2860 IndexVariables.push_back(IterationVar); 2861 2862 // Create a reference to the iteration variable. 2863 ExprResult IterationVarRef 2864 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2865 assert(!IterationVarRef.isInvalid() && 2866 "Reference to invented variable cannot fail!"); 2867 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2868 assert(!IterationVarRef.isInvalid() && 2869 "Conversion of invented variable cannot fail!"); 2870 2871 // Subscript the array with this iteration variable. 2872 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2873 IterationVarRef.take(), 2874 Loc); 2875 if (CtorArg.isInvalid()) 2876 return true; 2877 2878 BaseType = Array->getElementType(); 2879 } 2880 2881 // The array subscript expression is an lvalue, which is wrong for moving. 2882 if (Moving && InitializingArray) 2883 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2884 2885 // Construct the entity that we will be initializing. For an array, this 2886 // will be first element in the array, which may require several levels 2887 // of array-subscript entities. 2888 SmallVector<InitializedEntity, 4> Entities; 2889 Entities.reserve(1 + IndexVariables.size()); 2890 if (Indirect) 2891 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2892 else 2893 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2894 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2895 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2896 0, 2897 Entities.back())); 2898 2899 // Direct-initialize to use the copy constructor. 2900 InitializationKind InitKind = 2901 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2902 2903 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2904 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2905 &CtorArgE, 1); 2906 2907 ExprResult MemberInit 2908 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2909 MultiExprArg(&CtorArgE, 1)); 2910 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2911 if (MemberInit.isInvalid()) 2912 return true; 2913 2914 if (Indirect) { 2915 assert(IndexVariables.size() == 0 && 2916 "Indirect field improperly initialized"); 2917 CXXMemberInit 2918 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2919 Loc, Loc, 2920 MemberInit.takeAs<Expr>(), 2921 Loc); 2922 } else 2923 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2924 Loc, MemberInit.takeAs<Expr>(), 2925 Loc, 2926 IndexVariables.data(), 2927 IndexVariables.size()); 2928 return false; 2929 } 2930 2931 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 2932 "Unhandled implicit init kind!"); 2933 2934 QualType FieldBaseElementType = 2935 SemaRef.Context.getBaseElementType(Field->getType()); 2936 2937 if (FieldBaseElementType->isRecordType()) { 2938 InitializedEntity InitEntity 2939 = Indirect? InitializedEntity::InitializeMember(Indirect) 2940 : InitializedEntity::InitializeMember(Field); 2941 InitializationKind InitKind = 2942 InitializationKind::CreateDefault(Loc); 2943 2944 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2945 ExprResult MemberInit = 2946 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2947 2948 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2949 if (MemberInit.isInvalid()) 2950 return true; 2951 2952 if (Indirect) 2953 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2954 Indirect, Loc, 2955 Loc, 2956 MemberInit.get(), 2957 Loc); 2958 else 2959 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2960 Field, Loc, Loc, 2961 MemberInit.get(), 2962 Loc); 2963 return false; 2964 } 2965 2966 if (!Field->getParent()->isUnion()) { 2967 if (FieldBaseElementType->isReferenceType()) { 2968 SemaRef.Diag(Constructor->getLocation(), 2969 diag::err_uninitialized_member_in_ctor) 2970 << (int)Constructor->isImplicit() 2971 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2972 << 0 << Field->getDeclName(); 2973 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2974 return true; 2975 } 2976 2977 if (FieldBaseElementType.isConstQualified()) { 2978 SemaRef.Diag(Constructor->getLocation(), 2979 diag::err_uninitialized_member_in_ctor) 2980 << (int)Constructor->isImplicit() 2981 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2982 << 1 << Field->getDeclName(); 2983 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2984 return true; 2985 } 2986 } 2987 2988 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2989 FieldBaseElementType->isObjCRetainableType() && 2990 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2991 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2992 // ARC: 2993 // Default-initialize Objective-C pointers to NULL. 2994 CXXMemberInit 2995 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2996 Loc, Loc, 2997 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2998 Loc); 2999 return false; 3000 } 3001 3002 // Nothing to initialize. 3003 CXXMemberInit = 0; 3004 return false; 3005 } 3006 3007 namespace { 3008 struct BaseAndFieldInfo { 3009 Sema &S; 3010 CXXConstructorDecl *Ctor; 3011 bool AnyErrorsInInits; 3012 ImplicitInitializerKind IIK; 3013 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3014 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3015 3016 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3017 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3018 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3019 if (Generated && Ctor->isCopyConstructor()) 3020 IIK = IIK_Copy; 3021 else if (Generated && Ctor->isMoveConstructor()) 3022 IIK = IIK_Move; 3023 else if (Ctor->getInheritedConstructor()) 3024 IIK = IIK_Inherit; 3025 else 3026 IIK = IIK_Default; 3027 } 3028 3029 bool isImplicitCopyOrMove() const { 3030 switch (IIK) { 3031 case IIK_Copy: 3032 case IIK_Move: 3033 return true; 3034 3035 case IIK_Default: 3036 case IIK_Inherit: 3037 return false; 3038 } 3039 3040 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3041 } 3042 3043 bool addFieldInitializer(CXXCtorInitializer *Init) { 3044 AllToInit.push_back(Init); 3045 3046 // Check whether this initializer makes the field "used". 3047 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 3048 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3049 3050 return false; 3051 } 3052 }; 3053 } 3054 3055 /// \brief Determine whether the given indirect field declaration is somewhere 3056 /// within an anonymous union. 3057 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3058 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3059 CEnd = F->chain_end(); 3060 C != CEnd; ++C) 3061 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3062 if (Record->isUnion()) 3063 return true; 3064 3065 return false; 3066 } 3067 3068 /// \brief Determine whether the given type is an incomplete or zero-lenfgth 3069 /// array type. 3070 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3071 if (T->isIncompleteArrayType()) 3072 return true; 3073 3074 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3075 if (!ArrayT->getSize()) 3076 return true; 3077 3078 T = ArrayT->getElementType(); 3079 } 3080 3081 return false; 3082 } 3083 3084 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3085 FieldDecl *Field, 3086 IndirectFieldDecl *Indirect = 0) { 3087 3088 // Overwhelmingly common case: we have a direct initializer for this field. 3089 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3090 return Info.addFieldInitializer(Init); 3091 3092 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3093 // has a brace-or-equal-initializer, the entity is initialized as specified 3094 // in [dcl.init]. 3095 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3096 CXXCtorInitializer *Init; 3097 if (Indirect) 3098 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3099 SourceLocation(), 3100 SourceLocation(), 0, 3101 SourceLocation()); 3102 else 3103 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3104 SourceLocation(), 3105 SourceLocation(), 0, 3106 SourceLocation()); 3107 return Info.addFieldInitializer(Init); 3108 } 3109 3110 // Don't build an implicit initializer for union members if none was 3111 // explicitly specified. 3112 if (Field->getParent()->isUnion() || 3113 (Indirect && isWithinAnonymousUnion(Indirect))) 3114 return false; 3115 3116 // Don't initialize incomplete or zero-length arrays. 3117 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3118 return false; 3119 3120 // Don't try to build an implicit initializer if there were semantic 3121 // errors in any of the initializers (and therefore we might be 3122 // missing some that the user actually wrote). 3123 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3124 return false; 3125 3126 CXXCtorInitializer *Init = 0; 3127 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3128 Indirect, Init)) 3129 return true; 3130 3131 if (!Init) 3132 return false; 3133 3134 return Info.addFieldInitializer(Init); 3135 } 3136 3137 bool 3138 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3139 CXXCtorInitializer *Initializer) { 3140 assert(Initializer->isDelegatingInitializer()); 3141 Constructor->setNumCtorInitializers(1); 3142 CXXCtorInitializer **initializer = 3143 new (Context) CXXCtorInitializer*[1]; 3144 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3145 Constructor->setCtorInitializers(initializer); 3146 3147 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3148 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3149 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3150 } 3151 3152 DelegatingCtorDecls.push_back(Constructor); 3153 3154 return false; 3155 } 3156 3157 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3158 ArrayRef<CXXCtorInitializer *> Initializers) { 3159 if (Constructor->isDependentContext()) { 3160 // Just store the initializers as written, they will be checked during 3161 // instantiation. 3162 if (!Initializers.empty()) { 3163 Constructor->setNumCtorInitializers(Initializers.size()); 3164 CXXCtorInitializer **baseOrMemberInitializers = 3165 new (Context) CXXCtorInitializer*[Initializers.size()]; 3166 memcpy(baseOrMemberInitializers, Initializers.data(), 3167 Initializers.size() * sizeof(CXXCtorInitializer*)); 3168 Constructor->setCtorInitializers(baseOrMemberInitializers); 3169 } 3170 3171 // Let template instantiation know whether we had errors. 3172 if (AnyErrors) 3173 Constructor->setInvalidDecl(); 3174 3175 return false; 3176 } 3177 3178 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3179 3180 // We need to build the initializer AST according to order of construction 3181 // and not what user specified in the Initializers list. 3182 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3183 if (!ClassDecl) 3184 return true; 3185 3186 bool HadError = false; 3187 3188 for (unsigned i = 0; i < Initializers.size(); i++) { 3189 CXXCtorInitializer *Member = Initializers[i]; 3190 3191 if (Member->isBaseInitializer()) 3192 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3193 else 3194 Info.AllBaseFields[Member->getAnyMember()] = Member; 3195 } 3196 3197 // Keep track of the direct virtual bases. 3198 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3199 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3200 E = ClassDecl->bases_end(); I != E; ++I) { 3201 if (I->isVirtual()) 3202 DirectVBases.insert(I); 3203 } 3204 3205 // Push virtual bases before others. 3206 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3207 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3208 3209 if (CXXCtorInitializer *Value 3210 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3211 Info.AllToInit.push_back(Value); 3212 } else if (!AnyErrors) { 3213 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3214 CXXCtorInitializer *CXXBaseInit; 3215 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3216 VBase, IsInheritedVirtualBase, 3217 CXXBaseInit)) { 3218 HadError = true; 3219 continue; 3220 } 3221 3222 Info.AllToInit.push_back(CXXBaseInit); 3223 } 3224 } 3225 3226 // Non-virtual bases. 3227 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3228 E = ClassDecl->bases_end(); Base != E; ++Base) { 3229 // Virtuals are in the virtual base list and already constructed. 3230 if (Base->isVirtual()) 3231 continue; 3232 3233 if (CXXCtorInitializer *Value 3234 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3235 Info.AllToInit.push_back(Value); 3236 } else if (!AnyErrors) { 3237 CXXCtorInitializer *CXXBaseInit; 3238 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3239 Base, /*IsInheritedVirtualBase=*/false, 3240 CXXBaseInit)) { 3241 HadError = true; 3242 continue; 3243 } 3244 3245 Info.AllToInit.push_back(CXXBaseInit); 3246 } 3247 } 3248 3249 // Fields. 3250 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3251 MemEnd = ClassDecl->decls_end(); 3252 Mem != MemEnd; ++Mem) { 3253 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3254 // C++ [class.bit]p2: 3255 // A declaration for a bit-field that omits the identifier declares an 3256 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3257 // initialized. 3258 if (F->isUnnamedBitfield()) 3259 continue; 3260 3261 // If we're not generating the implicit copy/move constructor, then we'll 3262 // handle anonymous struct/union fields based on their individual 3263 // indirect fields. 3264 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3265 continue; 3266 3267 if (CollectFieldInitializer(*this, Info, F)) 3268 HadError = true; 3269 continue; 3270 } 3271 3272 // Beyond this point, we only consider default initialization. 3273 if (Info.isImplicitCopyOrMove()) 3274 continue; 3275 3276 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3277 if (F->getType()->isIncompleteArrayType()) { 3278 assert(ClassDecl->hasFlexibleArrayMember() && 3279 "Incomplete array type is not valid"); 3280 continue; 3281 } 3282 3283 // Initialize each field of an anonymous struct individually. 3284 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3285 HadError = true; 3286 3287 continue; 3288 } 3289 } 3290 3291 unsigned NumInitializers = Info.AllToInit.size(); 3292 if (NumInitializers > 0) { 3293 Constructor->setNumCtorInitializers(NumInitializers); 3294 CXXCtorInitializer **baseOrMemberInitializers = 3295 new (Context) CXXCtorInitializer*[NumInitializers]; 3296 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3297 NumInitializers * sizeof(CXXCtorInitializer*)); 3298 Constructor->setCtorInitializers(baseOrMemberInitializers); 3299 3300 // Constructors implicitly reference the base and member 3301 // destructors. 3302 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3303 Constructor->getParent()); 3304 } 3305 3306 return HadError; 3307 } 3308 3309 static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3310 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3311 const RecordDecl *RD = RT->getDecl(); 3312 if (RD->isAnonymousStructOrUnion()) { 3313 for (RecordDecl::field_iterator Field = RD->field_begin(), 3314 E = RD->field_end(); Field != E; ++Field) 3315 PopulateKeysForFields(*Field, IdealInits); 3316 return; 3317 } 3318 } 3319 IdealInits.push_back(Field); 3320 } 3321 3322 static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3323 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3324 } 3325 3326 static void *GetKeyForMember(ASTContext &Context, 3327 CXXCtorInitializer *Member) { 3328 if (!Member->isAnyMemberInitializer()) 3329 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3330 3331 return Member->getAnyMember(); 3332 } 3333 3334 static void DiagnoseBaseOrMemInitializerOrder( 3335 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3336 ArrayRef<CXXCtorInitializer *> Inits) { 3337 if (Constructor->getDeclContext()->isDependentContext()) 3338 return; 3339 3340 // Don't check initializers order unless the warning is enabled at the 3341 // location of at least one initializer. 3342 bool ShouldCheckOrder = false; 3343 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3344 CXXCtorInitializer *Init = Inits[InitIndex]; 3345 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3346 Init->getSourceLocation()) 3347 != DiagnosticsEngine::Ignored) { 3348 ShouldCheckOrder = true; 3349 break; 3350 } 3351 } 3352 if (!ShouldCheckOrder) 3353 return; 3354 3355 // Build the list of bases and members in the order that they'll 3356 // actually be initialized. The explicit initializers should be in 3357 // this same order but may be missing things. 3358 SmallVector<const void*, 32> IdealInitKeys; 3359 3360 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3361 3362 // 1. Virtual bases. 3363 for (CXXRecordDecl::base_class_const_iterator VBase = 3364 ClassDecl->vbases_begin(), 3365 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3366 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3367 3368 // 2. Non-virtual bases. 3369 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3370 E = ClassDecl->bases_end(); Base != E; ++Base) { 3371 if (Base->isVirtual()) 3372 continue; 3373 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3374 } 3375 3376 // 3. Direct fields. 3377 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3378 E = ClassDecl->field_end(); Field != E; ++Field) { 3379 if (Field->isUnnamedBitfield()) 3380 continue; 3381 3382 PopulateKeysForFields(*Field, IdealInitKeys); 3383 } 3384 3385 unsigned NumIdealInits = IdealInitKeys.size(); 3386 unsigned IdealIndex = 0; 3387 3388 CXXCtorInitializer *PrevInit = 0; 3389 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3390 CXXCtorInitializer *Init = Inits[InitIndex]; 3391 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3392 3393 // Scan forward to try to find this initializer in the idealized 3394 // initializers list. 3395 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3396 if (InitKey == IdealInitKeys[IdealIndex]) 3397 break; 3398 3399 // If we didn't find this initializer, it must be because we 3400 // scanned past it on a previous iteration. That can only 3401 // happen if we're out of order; emit a warning. 3402 if (IdealIndex == NumIdealInits && PrevInit) { 3403 Sema::SemaDiagnosticBuilder D = 3404 SemaRef.Diag(PrevInit->getSourceLocation(), 3405 diag::warn_initializer_out_of_order); 3406 3407 if (PrevInit->isAnyMemberInitializer()) 3408 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3409 else 3410 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3411 3412 if (Init->isAnyMemberInitializer()) 3413 D << 0 << Init->getAnyMember()->getDeclName(); 3414 else 3415 D << 1 << Init->getTypeSourceInfo()->getType(); 3416 3417 // Move back to the initializer's location in the ideal list. 3418 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3419 if (InitKey == IdealInitKeys[IdealIndex]) 3420 break; 3421 3422 assert(IdealIndex != NumIdealInits && 3423 "initializer not found in initializer list"); 3424 } 3425 3426 PrevInit = Init; 3427 } 3428 } 3429 3430 namespace { 3431 bool CheckRedundantInit(Sema &S, 3432 CXXCtorInitializer *Init, 3433 CXXCtorInitializer *&PrevInit) { 3434 if (!PrevInit) { 3435 PrevInit = Init; 3436 return false; 3437 } 3438 3439 if (FieldDecl *Field = Init->getMember()) 3440 S.Diag(Init->getSourceLocation(), 3441 diag::err_multiple_mem_initialization) 3442 << Field->getDeclName() 3443 << Init->getSourceRange(); 3444 else { 3445 const Type *BaseClass = Init->getBaseClass(); 3446 assert(BaseClass && "neither field nor base"); 3447 S.Diag(Init->getSourceLocation(), 3448 diag::err_multiple_base_initialization) 3449 << QualType(BaseClass, 0) 3450 << Init->getSourceRange(); 3451 } 3452 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3453 << 0 << PrevInit->getSourceRange(); 3454 3455 return true; 3456 } 3457 3458 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3459 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3460 3461 bool CheckRedundantUnionInit(Sema &S, 3462 CXXCtorInitializer *Init, 3463 RedundantUnionMap &Unions) { 3464 FieldDecl *Field = Init->getAnyMember(); 3465 RecordDecl *Parent = Field->getParent(); 3466 NamedDecl *Child = Field; 3467 3468 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3469 if (Parent->isUnion()) { 3470 UnionEntry &En = Unions[Parent]; 3471 if (En.first && En.first != Child) { 3472 S.Diag(Init->getSourceLocation(), 3473 diag::err_multiple_mem_union_initialization) 3474 << Field->getDeclName() 3475 << Init->getSourceRange(); 3476 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3477 << 0 << En.second->getSourceRange(); 3478 return true; 3479 } 3480 if (!En.first) { 3481 En.first = Child; 3482 En.second = Init; 3483 } 3484 if (!Parent->isAnonymousStructOrUnion()) 3485 return false; 3486 } 3487 3488 Child = Parent; 3489 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3490 } 3491 3492 return false; 3493 } 3494 } 3495 3496 /// ActOnMemInitializers - Handle the member initializers for a constructor. 3497 void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3498 SourceLocation ColonLoc, 3499 ArrayRef<CXXCtorInitializer*> MemInits, 3500 bool AnyErrors) { 3501 if (!ConstructorDecl) 3502 return; 3503 3504 AdjustDeclIfTemplate(ConstructorDecl); 3505 3506 CXXConstructorDecl *Constructor 3507 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3508 3509 if (!Constructor) { 3510 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3511 return; 3512 } 3513 3514 // Mapping for the duplicate initializers check. 3515 // For member initializers, this is keyed with a FieldDecl*. 3516 // For base initializers, this is keyed with a Type*. 3517 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3518 3519 // Mapping for the inconsistent anonymous-union initializers check. 3520 RedundantUnionMap MemberUnions; 3521 3522 bool HadError = false; 3523 for (unsigned i = 0; i < MemInits.size(); i++) { 3524 CXXCtorInitializer *Init = MemInits[i]; 3525 3526 // Set the source order index. 3527 Init->setSourceOrder(i); 3528 3529 if (Init->isAnyMemberInitializer()) { 3530 FieldDecl *Field = Init->getAnyMember(); 3531 if (CheckRedundantInit(*this, Init, Members[Field]) || 3532 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3533 HadError = true; 3534 } else if (Init->isBaseInitializer()) { 3535 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3536 if (CheckRedundantInit(*this, Init, Members[Key])) 3537 HadError = true; 3538 } else { 3539 assert(Init->isDelegatingInitializer()); 3540 // This must be the only initializer 3541 if (MemInits.size() != 1) { 3542 Diag(Init->getSourceLocation(), 3543 diag::err_delegating_initializer_alone) 3544 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3545 // We will treat this as being the only initializer. 3546 } 3547 SetDelegatingInitializer(Constructor, MemInits[i]); 3548 // Return immediately as the initializer is set. 3549 return; 3550 } 3551 } 3552 3553 if (HadError) 3554 return; 3555 3556 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3557 3558 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3559 } 3560 3561 void 3562 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3563 CXXRecordDecl *ClassDecl) { 3564 // Ignore dependent contexts. Also ignore unions, since their members never 3565 // have destructors implicitly called. 3566 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3567 return; 3568 3569 // FIXME: all the access-control diagnostics are positioned on the 3570 // field/base declaration. That's probably good; that said, the 3571 // user might reasonably want to know why the destructor is being 3572 // emitted, and we currently don't say. 3573 3574 // Non-static data members. 3575 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3576 E = ClassDecl->field_end(); I != E; ++I) { 3577 FieldDecl *Field = *I; 3578 if (Field->isInvalidDecl()) 3579 continue; 3580 3581 // Don't destroy incomplete or zero-length arrays. 3582 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3583 continue; 3584 3585 QualType FieldType = Context.getBaseElementType(Field->getType()); 3586 3587 const RecordType* RT = FieldType->getAs<RecordType>(); 3588 if (!RT) 3589 continue; 3590 3591 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3592 if (FieldClassDecl->isInvalidDecl()) 3593 continue; 3594 if (FieldClassDecl->hasIrrelevantDestructor()) 3595 continue; 3596 // The destructor for an implicit anonymous union member is never invoked. 3597 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3598 continue; 3599 3600 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3601 assert(Dtor && "No dtor found for FieldClassDecl!"); 3602 CheckDestructorAccess(Field->getLocation(), Dtor, 3603 PDiag(diag::err_access_dtor_field) 3604 << Field->getDeclName() 3605 << FieldType); 3606 3607 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3608 DiagnoseUseOfDecl(Dtor, Location); 3609 } 3610 3611 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3612 3613 // Bases. 3614 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3615 E = ClassDecl->bases_end(); Base != E; ++Base) { 3616 // Bases are always records in a well-formed non-dependent class. 3617 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3618 3619 // Remember direct virtual bases. 3620 if (Base->isVirtual()) 3621 DirectVirtualBases.insert(RT); 3622 3623 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3624 // If our base class is invalid, we probably can't get its dtor anyway. 3625 if (BaseClassDecl->isInvalidDecl()) 3626 continue; 3627 if (BaseClassDecl->hasIrrelevantDestructor()) 3628 continue; 3629 3630 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3631 assert(Dtor && "No dtor found for BaseClassDecl!"); 3632 3633 // FIXME: caret should be on the start of the class name 3634 CheckDestructorAccess(Base->getLocStart(), Dtor, 3635 PDiag(diag::err_access_dtor_base) 3636 << Base->getType() 3637 << Base->getSourceRange(), 3638 Context.getTypeDeclType(ClassDecl)); 3639 3640 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3641 DiagnoseUseOfDecl(Dtor, Location); 3642 } 3643 3644 // Virtual bases. 3645 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3646 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3647 3648 // Bases are always records in a well-formed non-dependent class. 3649 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3650 3651 // Ignore direct virtual bases. 3652 if (DirectVirtualBases.count(RT)) 3653 continue; 3654 3655 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3656 // If our base class is invalid, we probably can't get its dtor anyway. 3657 if (BaseClassDecl->isInvalidDecl()) 3658 continue; 3659 if (BaseClassDecl->hasIrrelevantDestructor()) 3660 continue; 3661 3662 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3663 assert(Dtor && "No dtor found for BaseClassDecl!"); 3664 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3665 PDiag(diag::err_access_dtor_vbase) 3666 << VBase->getType(), 3667 Context.getTypeDeclType(ClassDecl)); 3668 3669 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3670 DiagnoseUseOfDecl(Dtor, Location); 3671 } 3672 } 3673 3674 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3675 if (!CDtorDecl) 3676 return; 3677 3678 if (CXXConstructorDecl *Constructor 3679 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3680 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3681 } 3682 3683 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3684 unsigned DiagID, AbstractDiagSelID SelID) { 3685 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3686 unsigned DiagID; 3687 AbstractDiagSelID SelID; 3688 3689 public: 3690 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3691 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3692 3693 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3694 if (Suppressed) return; 3695 if (SelID == -1) 3696 S.Diag(Loc, DiagID) << T; 3697 else 3698 S.Diag(Loc, DiagID) << SelID << T; 3699 } 3700 } Diagnoser(DiagID, SelID); 3701 3702 return RequireNonAbstractType(Loc, T, Diagnoser); 3703 } 3704 3705 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3706 TypeDiagnoser &Diagnoser) { 3707 if (!getLangOpts().CPlusPlus) 3708 return false; 3709 3710 if (const ArrayType *AT = Context.getAsArrayType(T)) 3711 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3712 3713 if (const PointerType *PT = T->getAs<PointerType>()) { 3714 // Find the innermost pointer type. 3715 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3716 PT = T; 3717 3718 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3719 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3720 } 3721 3722 const RecordType *RT = T->getAs<RecordType>(); 3723 if (!RT) 3724 return false; 3725 3726 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3727 3728 // We can't answer whether something is abstract until it has a 3729 // definition. If it's currently being defined, we'll walk back 3730 // over all the declarations when we have a full definition. 3731 const CXXRecordDecl *Def = RD->getDefinition(); 3732 if (!Def || Def->isBeingDefined()) 3733 return false; 3734 3735 if (!RD->isAbstract()) 3736 return false; 3737 3738 Diagnoser.diagnose(*this, Loc, T); 3739 DiagnoseAbstractType(RD); 3740 3741 return true; 3742 } 3743 3744 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3745 // Check if we've already emitted the list of pure virtual functions 3746 // for this class. 3747 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3748 return; 3749 3750 CXXFinalOverriderMap FinalOverriders; 3751 RD->getFinalOverriders(FinalOverriders); 3752 3753 // Keep a set of seen pure methods so we won't diagnose the same method 3754 // more than once. 3755 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3756 3757 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3758 MEnd = FinalOverriders.end(); 3759 M != MEnd; 3760 ++M) { 3761 for (OverridingMethods::iterator SO = M->second.begin(), 3762 SOEnd = M->second.end(); 3763 SO != SOEnd; ++SO) { 3764 // C++ [class.abstract]p4: 3765 // A class is abstract if it contains or inherits at least one 3766 // pure virtual function for which the final overrider is pure 3767 // virtual. 3768 3769 // 3770 if (SO->second.size() != 1) 3771 continue; 3772 3773 if (!SO->second.front().Method->isPure()) 3774 continue; 3775 3776 if (!SeenPureMethods.insert(SO->second.front().Method)) 3777 continue; 3778 3779 Diag(SO->second.front().Method->getLocation(), 3780 diag::note_pure_virtual_function) 3781 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3782 } 3783 } 3784 3785 if (!PureVirtualClassDiagSet) 3786 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3787 PureVirtualClassDiagSet->insert(RD); 3788 } 3789 3790 namespace { 3791 struct AbstractUsageInfo { 3792 Sema &S; 3793 CXXRecordDecl *Record; 3794 CanQualType AbstractType; 3795 bool Invalid; 3796 3797 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3798 : S(S), Record(Record), 3799 AbstractType(S.Context.getCanonicalType( 3800 S.Context.getTypeDeclType(Record))), 3801 Invalid(false) {} 3802 3803 void DiagnoseAbstractType() { 3804 if (Invalid) return; 3805 S.DiagnoseAbstractType(Record); 3806 Invalid = true; 3807 } 3808 3809 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3810 }; 3811 3812 struct CheckAbstractUsage { 3813 AbstractUsageInfo &Info; 3814 const NamedDecl *Ctx; 3815 3816 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3817 : Info(Info), Ctx(Ctx) {} 3818 3819 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3820 switch (TL.getTypeLocClass()) { 3821 #define ABSTRACT_TYPELOC(CLASS, PARENT) 3822 #define TYPELOC(CLASS, PARENT) \ 3823 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3824 #include "clang/AST/TypeLocNodes.def" 3825 } 3826 } 3827 3828 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3829 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3830 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3831 if (!TL.getArg(I)) 3832 continue; 3833 3834 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3835 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3836 } 3837 } 3838 3839 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3840 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3841 } 3842 3843 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3844 // Visit the type parameters from a permissive context. 3845 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3846 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3847 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3848 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3849 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3850 // TODO: other template argument types? 3851 } 3852 } 3853 3854 // Visit pointee types from a permissive context. 3855 #define CheckPolymorphic(Type) \ 3856 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3857 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3858 } 3859 CheckPolymorphic(PointerTypeLoc) 3860 CheckPolymorphic(ReferenceTypeLoc) 3861 CheckPolymorphic(MemberPointerTypeLoc) 3862 CheckPolymorphic(BlockPointerTypeLoc) 3863 CheckPolymorphic(AtomicTypeLoc) 3864 3865 /// Handle all the types we haven't given a more specific 3866 /// implementation for above. 3867 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3868 // Every other kind of type that we haven't called out already 3869 // that has an inner type is either (1) sugar or (2) contains that 3870 // inner type in some way as a subobject. 3871 if (TypeLoc Next = TL.getNextTypeLoc()) 3872 return Visit(Next, Sel); 3873 3874 // If there's no inner type and we're in a permissive context, 3875 // don't diagnose. 3876 if (Sel == Sema::AbstractNone) return; 3877 3878 // Check whether the type matches the abstract type. 3879 QualType T = TL.getType(); 3880 if (T->isArrayType()) { 3881 Sel = Sema::AbstractArrayType; 3882 T = Info.S.Context.getBaseElementType(T); 3883 } 3884 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3885 if (CT != Info.AbstractType) return; 3886 3887 // It matched; do some magic. 3888 if (Sel == Sema::AbstractArrayType) { 3889 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3890 << T << TL.getSourceRange(); 3891 } else { 3892 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3893 << Sel << T << TL.getSourceRange(); 3894 } 3895 Info.DiagnoseAbstractType(); 3896 } 3897 }; 3898 3899 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3900 Sema::AbstractDiagSelID Sel) { 3901 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3902 } 3903 3904 } 3905 3906 /// Check for invalid uses of an abstract type in a method declaration. 3907 static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3908 CXXMethodDecl *MD) { 3909 // No need to do the check on definitions, which require that 3910 // the return/param types be complete. 3911 if (MD->doesThisDeclarationHaveABody()) 3912 return; 3913 3914 // For safety's sake, just ignore it if we don't have type source 3915 // information. This should never happen for non-implicit methods, 3916 // but... 3917 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3918 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3919 } 3920 3921 /// Check for invalid uses of an abstract type within a class definition. 3922 static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3923 CXXRecordDecl *RD) { 3924 for (CXXRecordDecl::decl_iterator 3925 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3926 Decl *D = *I; 3927 if (D->isImplicit()) continue; 3928 3929 // Methods and method templates. 3930 if (isa<CXXMethodDecl>(D)) { 3931 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3932 } else if (isa<FunctionTemplateDecl>(D)) { 3933 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3934 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3935 3936 // Fields and static variables. 3937 } else if (isa<FieldDecl>(D)) { 3938 FieldDecl *FD = cast<FieldDecl>(D); 3939 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3940 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3941 } else if (isa<VarDecl>(D)) { 3942 VarDecl *VD = cast<VarDecl>(D); 3943 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3944 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3945 3946 // Nested classes and class templates. 3947 } else if (isa<CXXRecordDecl>(D)) { 3948 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3949 } else if (isa<ClassTemplateDecl>(D)) { 3950 CheckAbstractClassUsage(Info, 3951 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3952 } 3953 } 3954 } 3955 3956 /// \brief Perform semantic checks on a class definition that has been 3957 /// completing, introducing implicitly-declared members, checking for 3958 /// abstract types, etc. 3959 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3960 if (!Record) 3961 return; 3962 3963 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3964 AbstractUsageInfo Info(*this, Record); 3965 CheckAbstractClassUsage(Info, Record); 3966 } 3967 3968 // If this is not an aggregate type and has no user-declared constructor, 3969 // complain about any non-static data members of reference or const scalar 3970 // type, since they will never get initializers. 3971 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3972 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3973 !Record->isLambda()) { 3974 bool Complained = false; 3975 for (RecordDecl::field_iterator F = Record->field_begin(), 3976 FEnd = Record->field_end(); 3977 F != FEnd; ++F) { 3978 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3979 continue; 3980 3981 if (F->getType()->isReferenceType() || 3982 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3983 if (!Complained) { 3984 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3985 << Record->getTagKind() << Record; 3986 Complained = true; 3987 } 3988 3989 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3990 << F->getType()->isReferenceType() 3991 << F->getDeclName(); 3992 } 3993 } 3994 } 3995 3996 if (Record->isDynamicClass() && !Record->isDependentType()) 3997 DynamicClasses.push_back(Record); 3998 3999 if (Record->getIdentifier()) { 4000 // C++ [class.mem]p13: 4001 // If T is the name of a class, then each of the following shall have a 4002 // name different from T: 4003 // - every member of every anonymous union that is a member of class T. 4004 // 4005 // C++ [class.mem]p14: 4006 // In addition, if class T has a user-declared constructor (12.1), every 4007 // non-static data member of class T shall have a name different from T. 4008 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4009 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4010 ++I) { 4011 NamedDecl *D = *I; 4012 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4013 isa<IndirectFieldDecl>(D)) { 4014 Diag(D->getLocation(), diag::err_member_name_of_class) 4015 << D->getDeclName(); 4016 break; 4017 } 4018 } 4019 } 4020 4021 // Warn if the class has virtual methods but non-virtual public destructor. 4022 if (Record->isPolymorphic() && !Record->isDependentType()) { 4023 CXXDestructorDecl *dtor = Record->getDestructor(); 4024 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4025 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4026 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4027 } 4028 4029 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4030 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4031 DiagnoseAbstractType(Record); 4032 } 4033 4034 if (!Record->isDependentType()) { 4035 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4036 MEnd = Record->method_end(); 4037 M != MEnd; ++M) { 4038 // See if a method overloads virtual methods in a base 4039 // class without overriding any. 4040 if (!M->isStatic()) 4041 DiagnoseHiddenVirtualMethods(Record, *M); 4042 4043 // Check whether the explicitly-defaulted special members are valid. 4044 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4045 CheckExplicitlyDefaultedSpecialMember(*M); 4046 4047 // For an explicitly defaulted or deleted special member, we defer 4048 // determining triviality until the class is complete. That time is now! 4049 if (!M->isImplicit() && !M->isUserProvided()) { 4050 CXXSpecialMember CSM = getSpecialMember(*M); 4051 if (CSM != CXXInvalid) { 4052 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4053 4054 // Inform the class that we've finished declaring this member. 4055 Record->finishedDefaultedOrDeletedMember(*M); 4056 } 4057 } 4058 } 4059 } 4060 4061 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4062 // function that is not a constructor declares that member function to be 4063 // const. [...] The class of which that function is a member shall be 4064 // a literal type. 4065 // 4066 // If the class has virtual bases, any constexpr members will already have 4067 // been diagnosed by the checks performed on the member declaration, so 4068 // suppress this (less useful) diagnostic. 4069 // 4070 // We delay this until we know whether an explicitly-defaulted (or deleted) 4071 // destructor for the class is trivial. 4072 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4073 !Record->isLiteral() && !Record->getNumVBases()) { 4074 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4075 MEnd = Record->method_end(); 4076 M != MEnd; ++M) { 4077 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4078 switch (Record->getTemplateSpecializationKind()) { 4079 case TSK_ImplicitInstantiation: 4080 case TSK_ExplicitInstantiationDeclaration: 4081 case TSK_ExplicitInstantiationDefinition: 4082 // If a template instantiates to a non-literal type, but its members 4083 // instantiate to constexpr functions, the template is technically 4084 // ill-formed, but we allow it for sanity. 4085 continue; 4086 4087 case TSK_Undeclared: 4088 case TSK_ExplicitSpecialization: 4089 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4090 diag::err_constexpr_method_non_literal); 4091 break; 4092 } 4093 4094 // Only produce one error per class. 4095 break; 4096 } 4097 } 4098 } 4099 4100 // Declare inheriting constructors. We do this eagerly here because: 4101 // - The standard requires an eager diagnostic for conflicting inheriting 4102 // constructors from different classes. 4103 // - The lazy declaration of the other implicit constructors is so as to not 4104 // waste space and performance on classes that are not meant to be 4105 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4106 // have inheriting constructors. 4107 DeclareInheritingConstructors(Record); 4108 } 4109 4110 /// Is the special member function which would be selected to perform the 4111 /// specified operation on the specified class type a constexpr constructor? 4112 static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4113 Sema::CXXSpecialMember CSM, 4114 bool ConstArg) { 4115 Sema::SpecialMemberOverloadResult *SMOR = 4116 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4117 false, false, false, false); 4118 if (!SMOR || !SMOR->getMethod()) 4119 // A constructor we wouldn't select can't be "involved in initializing" 4120 // anything. 4121 return true; 4122 return SMOR->getMethod()->isConstexpr(); 4123 } 4124 4125 /// Determine whether the specified special member function would be constexpr 4126 /// if it were implicitly defined. 4127 static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4128 Sema::CXXSpecialMember CSM, 4129 bool ConstArg) { 4130 if (!S.getLangOpts().CPlusPlus11) 4131 return false; 4132 4133 // C++11 [dcl.constexpr]p4: 4134 // In the definition of a constexpr constructor [...] 4135 switch (CSM) { 4136 case Sema::CXXDefaultConstructor: 4137 // Since default constructor lookup is essentially trivial (and cannot 4138 // involve, for instance, template instantiation), we compute whether a 4139 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4140 // 4141 // This is important for performance; we need to know whether the default 4142 // constructor is constexpr to determine whether the type is a literal type. 4143 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4144 4145 case Sema::CXXCopyConstructor: 4146 case Sema::CXXMoveConstructor: 4147 // For copy or move constructors, we need to perform overload resolution. 4148 break; 4149 4150 case Sema::CXXCopyAssignment: 4151 case Sema::CXXMoveAssignment: 4152 case Sema::CXXDestructor: 4153 case Sema::CXXInvalid: 4154 return false; 4155 } 4156 4157 // -- if the class is a non-empty union, or for each non-empty anonymous 4158 // union member of a non-union class, exactly one non-static data member 4159 // shall be initialized; [DR1359] 4160 // 4161 // If we squint, this is guaranteed, since exactly one non-static data member 4162 // will be initialized (if the constructor isn't deleted), we just don't know 4163 // which one. 4164 if (ClassDecl->isUnion()) 4165 return true; 4166 4167 // -- the class shall not have any virtual base classes; 4168 if (ClassDecl->getNumVBases()) 4169 return false; 4170 4171 // -- every constructor involved in initializing [...] base class 4172 // sub-objects shall be a constexpr constructor; 4173 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4174 BEnd = ClassDecl->bases_end(); 4175 B != BEnd; ++B) { 4176 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4177 if (!BaseType) continue; 4178 4179 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4180 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4181 return false; 4182 } 4183 4184 // -- every constructor involved in initializing non-static data members 4185 // [...] shall be a constexpr constructor; 4186 // -- every non-static data member and base class sub-object shall be 4187 // initialized 4188 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4189 FEnd = ClassDecl->field_end(); 4190 F != FEnd; ++F) { 4191 if (F->isInvalidDecl()) 4192 continue; 4193 if (const RecordType *RecordTy = 4194 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4195 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4196 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4197 return false; 4198 } 4199 } 4200 4201 // All OK, it's constexpr! 4202 return true; 4203 } 4204 4205 static Sema::ImplicitExceptionSpecification 4206 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4207 switch (S.getSpecialMember(MD)) { 4208 case Sema::CXXDefaultConstructor: 4209 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4210 case Sema::CXXCopyConstructor: 4211 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4212 case Sema::CXXCopyAssignment: 4213 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4214 case Sema::CXXMoveConstructor: 4215 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4216 case Sema::CXXMoveAssignment: 4217 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4218 case Sema::CXXDestructor: 4219 return S.ComputeDefaultedDtorExceptionSpec(MD); 4220 case Sema::CXXInvalid: 4221 break; 4222 } 4223 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4224 "only special members have implicit exception specs"); 4225 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4226 } 4227 4228 static void 4229 updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4230 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4231 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4232 ExceptSpec.getEPI(EPI); 4233 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4234 S.Context.getFunctionType(FPT->getResultType(), FPT->getArgTypes(), EPI)); 4235 FD->setType(QualType(NewFPT, 0)); 4236 } 4237 4238 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4239 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4240 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4241 return; 4242 4243 // Evaluate the exception specification. 4244 ImplicitExceptionSpecification ExceptSpec = 4245 computeImplicitExceptionSpec(*this, Loc, MD); 4246 4247 // Update the type of the special member to use it. 4248 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4249 4250 // A user-provided destructor can be defined outside the class. When that 4251 // happens, be sure to update the exception specification on both 4252 // declarations. 4253 const FunctionProtoType *CanonicalFPT = 4254 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4255 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4256 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4257 CanonicalFPT, ExceptSpec); 4258 } 4259 4260 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4261 CXXRecordDecl *RD = MD->getParent(); 4262 CXXSpecialMember CSM = getSpecialMember(MD); 4263 4264 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4265 "not an explicitly-defaulted special member"); 4266 4267 // Whether this was the first-declared instance of the constructor. 4268 // This affects whether we implicitly add an exception spec and constexpr. 4269 bool First = MD == MD->getCanonicalDecl(); 4270 4271 bool HadError = false; 4272 4273 // C++11 [dcl.fct.def.default]p1: 4274 // A function that is explicitly defaulted shall 4275 // -- be a special member function (checked elsewhere), 4276 // -- have the same type (except for ref-qualifiers, and except that a 4277 // copy operation can take a non-const reference) as an implicit 4278 // declaration, and 4279 // -- not have default arguments. 4280 unsigned ExpectedParams = 1; 4281 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4282 ExpectedParams = 0; 4283 if (MD->getNumParams() != ExpectedParams) { 4284 // This also checks for default arguments: a copy or move constructor with a 4285 // default argument is classified as a default constructor, and assignment 4286 // operations and destructors can't have default arguments. 4287 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4288 << CSM << MD->getSourceRange(); 4289 HadError = true; 4290 } else if (MD->isVariadic()) { 4291 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4292 << CSM << MD->getSourceRange(); 4293 HadError = true; 4294 } 4295 4296 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4297 4298 bool CanHaveConstParam = false; 4299 if (CSM == CXXCopyConstructor) 4300 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4301 else if (CSM == CXXCopyAssignment) 4302 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4303 4304 QualType ReturnType = Context.VoidTy; 4305 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4306 // Check for return type matching. 4307 ReturnType = Type->getResultType(); 4308 QualType ExpectedReturnType = 4309 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4310 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4311 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4312 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4313 HadError = true; 4314 } 4315 4316 // A defaulted special member cannot have cv-qualifiers. 4317 if (Type->getTypeQuals()) { 4318 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4319 << (CSM == CXXMoveAssignment); 4320 HadError = true; 4321 } 4322 } 4323 4324 // Check for parameter type matching. 4325 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4326 bool HasConstParam = false; 4327 if (ExpectedParams && ArgType->isReferenceType()) { 4328 // Argument must be reference to possibly-const T. 4329 QualType ReferentType = ArgType->getPointeeType(); 4330 HasConstParam = ReferentType.isConstQualified(); 4331 4332 if (ReferentType.isVolatileQualified()) { 4333 Diag(MD->getLocation(), 4334 diag::err_defaulted_special_member_volatile_param) << CSM; 4335 HadError = true; 4336 } 4337 4338 if (HasConstParam && !CanHaveConstParam) { 4339 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4340 Diag(MD->getLocation(), 4341 diag::err_defaulted_special_member_copy_const_param) 4342 << (CSM == CXXCopyAssignment); 4343 // FIXME: Explain why this special member can't be const. 4344 } else { 4345 Diag(MD->getLocation(), 4346 diag::err_defaulted_special_member_move_const_param) 4347 << (CSM == CXXMoveAssignment); 4348 } 4349 HadError = true; 4350 } 4351 } else if (ExpectedParams) { 4352 // A copy assignment operator can take its argument by value, but a 4353 // defaulted one cannot. 4354 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4355 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4356 HadError = true; 4357 } 4358 4359 // C++11 [dcl.fct.def.default]p2: 4360 // An explicitly-defaulted function may be declared constexpr only if it 4361 // would have been implicitly declared as constexpr, 4362 // Do not apply this rule to members of class templates, since core issue 1358 4363 // makes such functions always instantiate to constexpr functions. For 4364 // non-constructors, this is checked elsewhere. 4365 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4366 HasConstParam); 4367 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4368 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4369 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4370 // FIXME: Explain why the constructor can't be constexpr. 4371 HadError = true; 4372 } 4373 4374 // and may have an explicit exception-specification only if it is compatible 4375 // with the exception-specification on the implicit declaration. 4376 if (Type->hasExceptionSpec()) { 4377 // Delay the check if this is the first declaration of the special member, 4378 // since we may not have parsed some necessary in-class initializers yet. 4379 if (First) 4380 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4381 else 4382 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4383 } 4384 4385 // If a function is explicitly defaulted on its first declaration, 4386 if (First) { 4387 // -- it is implicitly considered to be constexpr if the implicit 4388 // definition would be, 4389 MD->setConstexpr(Constexpr); 4390 4391 // -- it is implicitly considered to have the same exception-specification 4392 // as if it had been implicitly declared, 4393 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4394 EPI.ExceptionSpecType = EST_Unevaluated; 4395 EPI.ExceptionSpecDecl = MD; 4396 MD->setType(Context.getFunctionType(ReturnType, 4397 ArrayRef<QualType>(&ArgType, 4398 ExpectedParams), 4399 EPI)); 4400 } 4401 4402 if (ShouldDeleteSpecialMember(MD, CSM)) { 4403 if (First) { 4404 MD->setDeletedAsWritten(); 4405 } else { 4406 // C++11 [dcl.fct.def.default]p4: 4407 // [For a] user-provided explicitly-defaulted function [...] if such a 4408 // function is implicitly defined as deleted, the program is ill-formed. 4409 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4410 HadError = true; 4411 } 4412 } 4413 4414 if (HadError) 4415 MD->setInvalidDecl(); 4416 } 4417 4418 /// Check whether the exception specification provided for an 4419 /// explicitly-defaulted special member matches the exception specification 4420 /// that would have been generated for an implicit special member, per 4421 /// C++11 [dcl.fct.def.default]p2. 4422 void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4423 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4424 // Compute the implicit exception specification. 4425 FunctionProtoType::ExtProtoInfo EPI; 4426 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4427 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4428 Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI)); 4429 4430 // Ensure that it matches. 4431 CheckEquivalentExceptionSpec( 4432 PDiag(diag::err_incorrect_defaulted_exception_spec) 4433 << getSpecialMember(MD), PDiag(), 4434 ImplicitType, SourceLocation(), 4435 SpecifiedType, MD->getLocation()); 4436 } 4437 4438 void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4439 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4440 I != N; ++I) 4441 CheckExplicitlyDefaultedMemberExceptionSpec( 4442 DelayedDefaultedMemberExceptionSpecs[I].first, 4443 DelayedDefaultedMemberExceptionSpecs[I].second); 4444 4445 DelayedDefaultedMemberExceptionSpecs.clear(); 4446 } 4447 4448 namespace { 4449 struct SpecialMemberDeletionInfo { 4450 Sema &S; 4451 CXXMethodDecl *MD; 4452 Sema::CXXSpecialMember CSM; 4453 bool Diagnose; 4454 4455 // Properties of the special member, computed for convenience. 4456 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4457 SourceLocation Loc; 4458 4459 bool AllFieldsAreConst; 4460 4461 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4462 Sema::CXXSpecialMember CSM, bool Diagnose) 4463 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4464 IsConstructor(false), IsAssignment(false), IsMove(false), 4465 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4466 AllFieldsAreConst(true) { 4467 switch (CSM) { 4468 case Sema::CXXDefaultConstructor: 4469 case Sema::CXXCopyConstructor: 4470 IsConstructor = true; 4471 break; 4472 case Sema::CXXMoveConstructor: 4473 IsConstructor = true; 4474 IsMove = true; 4475 break; 4476 case Sema::CXXCopyAssignment: 4477 IsAssignment = true; 4478 break; 4479 case Sema::CXXMoveAssignment: 4480 IsAssignment = true; 4481 IsMove = true; 4482 break; 4483 case Sema::CXXDestructor: 4484 break; 4485 case Sema::CXXInvalid: 4486 llvm_unreachable("invalid special member kind"); 4487 } 4488 4489 if (MD->getNumParams()) { 4490 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4491 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4492 } 4493 } 4494 4495 bool inUnion() const { return MD->getParent()->isUnion(); } 4496 4497 /// Look up the corresponding special member in the given class. 4498 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4499 unsigned Quals) { 4500 unsigned TQ = MD->getTypeQualifiers(); 4501 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4502 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4503 Quals = 0; 4504 return S.LookupSpecialMember(Class, CSM, 4505 ConstArg || (Quals & Qualifiers::Const), 4506 VolatileArg || (Quals & Qualifiers::Volatile), 4507 MD->getRefQualifier() == RQ_RValue, 4508 TQ & Qualifiers::Const, 4509 TQ & Qualifiers::Volatile); 4510 } 4511 4512 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4513 4514 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4515 bool shouldDeleteForField(FieldDecl *FD); 4516 bool shouldDeleteForAllConstMembers(); 4517 4518 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4519 unsigned Quals); 4520 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4521 Sema::SpecialMemberOverloadResult *SMOR, 4522 bool IsDtorCallInCtor); 4523 4524 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4525 }; 4526 } 4527 4528 /// Is the given special member inaccessible when used on the given 4529 /// sub-object. 4530 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4531 CXXMethodDecl *target) { 4532 /// If we're operating on a base class, the object type is the 4533 /// type of this special member. 4534 QualType objectTy; 4535 AccessSpecifier access = target->getAccess(); 4536 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4537 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4538 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4539 4540 // If we're operating on a field, the object type is the type of the field. 4541 } else { 4542 objectTy = S.Context.getTypeDeclType(target->getParent()); 4543 } 4544 4545 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4546 } 4547 4548 /// Check whether we should delete a special member due to the implicit 4549 /// definition containing a call to a special member of a subobject. 4550 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4551 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4552 bool IsDtorCallInCtor) { 4553 CXXMethodDecl *Decl = SMOR->getMethod(); 4554 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4555 4556 int DiagKind = -1; 4557 4558 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4559 DiagKind = !Decl ? 0 : 1; 4560 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4561 DiagKind = 2; 4562 else if (!isAccessible(Subobj, Decl)) 4563 DiagKind = 3; 4564 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4565 !Decl->isTrivial()) { 4566 // A member of a union must have a trivial corresponding special member. 4567 // As a weird special case, a destructor call from a union's constructor 4568 // must be accessible and non-deleted, but need not be trivial. Such a 4569 // destructor is never actually called, but is semantically checked as 4570 // if it were. 4571 DiagKind = 4; 4572 } 4573 4574 if (DiagKind == -1) 4575 return false; 4576 4577 if (Diagnose) { 4578 if (Field) { 4579 S.Diag(Field->getLocation(), 4580 diag::note_deleted_special_member_class_subobject) 4581 << CSM << MD->getParent() << /*IsField*/true 4582 << Field << DiagKind << IsDtorCallInCtor; 4583 } else { 4584 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4585 S.Diag(Base->getLocStart(), 4586 diag::note_deleted_special_member_class_subobject) 4587 << CSM << MD->getParent() << /*IsField*/false 4588 << Base->getType() << DiagKind << IsDtorCallInCtor; 4589 } 4590 4591 if (DiagKind == 1) 4592 S.NoteDeletedFunction(Decl); 4593 // FIXME: Explain inaccessibility if DiagKind == 3. 4594 } 4595 4596 return true; 4597 } 4598 4599 /// Check whether we should delete a special member function due to having a 4600 /// direct or virtual base class or non-static data member of class type M. 4601 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4602 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4603 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4604 4605 // C++11 [class.ctor]p5: 4606 // -- any direct or virtual base class, or non-static data member with no 4607 // brace-or-equal-initializer, has class type M (or array thereof) and 4608 // either M has no default constructor or overload resolution as applied 4609 // to M's default constructor results in an ambiguity or in a function 4610 // that is deleted or inaccessible 4611 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4612 // -- a direct or virtual base class B that cannot be copied/moved because 4613 // overload resolution, as applied to B's corresponding special member, 4614 // results in an ambiguity or a function that is deleted or inaccessible 4615 // from the defaulted special member 4616 // C++11 [class.dtor]p5: 4617 // -- any direct or virtual base class [...] has a type with a destructor 4618 // that is deleted or inaccessible 4619 if (!(CSM == Sema::CXXDefaultConstructor && 4620 Field && Field->hasInClassInitializer()) && 4621 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4622 return true; 4623 4624 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4625 // -- any direct or virtual base class or non-static data member has a 4626 // type with a destructor that is deleted or inaccessible 4627 if (IsConstructor) { 4628 Sema::SpecialMemberOverloadResult *SMOR = 4629 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4630 false, false, false, false, false); 4631 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4632 return true; 4633 } 4634 4635 return false; 4636 } 4637 4638 /// Check whether we should delete a special member function due to the class 4639 /// having a particular direct or virtual base class. 4640 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4641 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4642 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4643 } 4644 4645 /// Check whether we should delete a special member function due to the class 4646 /// having a particular non-static data member. 4647 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4648 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4649 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4650 4651 if (CSM == Sema::CXXDefaultConstructor) { 4652 // For a default constructor, all references must be initialized in-class 4653 // and, if a union, it must have a non-const member. 4654 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4655 if (Diagnose) 4656 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4657 << MD->getParent() << FD << FieldType << /*Reference*/0; 4658 return true; 4659 } 4660 // C++11 [class.ctor]p5: any non-variant non-static data member of 4661 // const-qualified type (or array thereof) with no 4662 // brace-or-equal-initializer does not have a user-provided default 4663 // constructor. 4664 if (!inUnion() && FieldType.isConstQualified() && 4665 !FD->hasInClassInitializer() && 4666 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4667 if (Diagnose) 4668 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4669 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4670 return true; 4671 } 4672 4673 if (inUnion() && !FieldType.isConstQualified()) 4674 AllFieldsAreConst = false; 4675 } else if (CSM == Sema::CXXCopyConstructor) { 4676 // For a copy constructor, data members must not be of rvalue reference 4677 // type. 4678 if (FieldType->isRValueReferenceType()) { 4679 if (Diagnose) 4680 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4681 << MD->getParent() << FD << FieldType; 4682 return true; 4683 } 4684 } else if (IsAssignment) { 4685 // For an assignment operator, data members must not be of reference type. 4686 if (FieldType->isReferenceType()) { 4687 if (Diagnose) 4688 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4689 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4690 return true; 4691 } 4692 if (!FieldRecord && FieldType.isConstQualified()) { 4693 // C++11 [class.copy]p23: 4694 // -- a non-static data member of const non-class type (or array thereof) 4695 if (Diagnose) 4696 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4697 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4698 return true; 4699 } 4700 } 4701 4702 if (FieldRecord) { 4703 // Some additional restrictions exist on the variant members. 4704 if (!inUnion() && FieldRecord->isUnion() && 4705 FieldRecord->isAnonymousStructOrUnion()) { 4706 bool AllVariantFieldsAreConst = true; 4707 4708 // FIXME: Handle anonymous unions declared within anonymous unions. 4709 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4710 UE = FieldRecord->field_end(); 4711 UI != UE; ++UI) { 4712 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4713 4714 if (!UnionFieldType.isConstQualified()) 4715 AllVariantFieldsAreConst = false; 4716 4717 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4718 if (UnionFieldRecord && 4719 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4720 UnionFieldType.getCVRQualifiers())) 4721 return true; 4722 } 4723 4724 // At least one member in each anonymous union must be non-const 4725 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4726 FieldRecord->field_begin() != FieldRecord->field_end()) { 4727 if (Diagnose) 4728 S.Diag(FieldRecord->getLocation(), 4729 diag::note_deleted_default_ctor_all_const) 4730 << MD->getParent() << /*anonymous union*/1; 4731 return true; 4732 } 4733 4734 // Don't check the implicit member of the anonymous union type. 4735 // This is technically non-conformant, but sanity demands it. 4736 return false; 4737 } 4738 4739 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4740 FieldType.getCVRQualifiers())) 4741 return true; 4742 } 4743 4744 return false; 4745 } 4746 4747 /// C++11 [class.ctor] p5: 4748 /// A defaulted default constructor for a class X is defined as deleted if 4749 /// X is a union and all of its variant members are of const-qualified type. 4750 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4751 // This is a silly definition, because it gives an empty union a deleted 4752 // default constructor. Don't do that. 4753 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4754 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4755 if (Diagnose) 4756 S.Diag(MD->getParent()->getLocation(), 4757 diag::note_deleted_default_ctor_all_const) 4758 << MD->getParent() << /*not anonymous union*/0; 4759 return true; 4760 } 4761 return false; 4762 } 4763 4764 /// Determine whether a defaulted special member function should be defined as 4765 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4766 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4767 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4768 bool Diagnose) { 4769 if (MD->isInvalidDecl()) 4770 return false; 4771 CXXRecordDecl *RD = MD->getParent(); 4772 assert(!RD->isDependentType() && "do deletion after instantiation"); 4773 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4774 return false; 4775 4776 // C++11 [expr.lambda.prim]p19: 4777 // The closure type associated with a lambda-expression has a 4778 // deleted (8.4.3) default constructor and a deleted copy 4779 // assignment operator. 4780 if (RD->isLambda() && 4781 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4782 if (Diagnose) 4783 Diag(RD->getLocation(), diag::note_lambda_decl); 4784 return true; 4785 } 4786 4787 // For an anonymous struct or union, the copy and assignment special members 4788 // will never be used, so skip the check. For an anonymous union declared at 4789 // namespace scope, the constructor and destructor are used. 4790 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4791 RD->isAnonymousStructOrUnion()) 4792 return false; 4793 4794 // C++11 [class.copy]p7, p18: 4795 // If the class definition declares a move constructor or move assignment 4796 // operator, an implicitly declared copy constructor or copy assignment 4797 // operator is defined as deleted. 4798 if (MD->isImplicit() && 4799 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4800 CXXMethodDecl *UserDeclaredMove = 0; 4801 4802 // In Microsoft mode, a user-declared move only causes the deletion of the 4803 // corresponding copy operation, not both copy operations. 4804 if (RD->hasUserDeclaredMoveConstructor() && 4805 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4806 if (!Diagnose) return true; 4807 4808 // Find any user-declared move constructor. 4809 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4810 E = RD->ctor_end(); I != E; ++I) { 4811 if (I->isMoveConstructor()) { 4812 UserDeclaredMove = *I; 4813 break; 4814 } 4815 } 4816 assert(UserDeclaredMove); 4817 } else if (RD->hasUserDeclaredMoveAssignment() && 4818 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4819 if (!Diagnose) return true; 4820 4821 // Find any user-declared move assignment operator. 4822 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4823 E = RD->method_end(); I != E; ++I) { 4824 if (I->isMoveAssignmentOperator()) { 4825 UserDeclaredMove = *I; 4826 break; 4827 } 4828 } 4829 assert(UserDeclaredMove); 4830 } 4831 4832 if (UserDeclaredMove) { 4833 Diag(UserDeclaredMove->getLocation(), 4834 diag::note_deleted_copy_user_declared_move) 4835 << (CSM == CXXCopyAssignment) << RD 4836 << UserDeclaredMove->isMoveAssignmentOperator(); 4837 return true; 4838 } 4839 } 4840 4841 // Do access control from the special member function 4842 ContextRAII MethodContext(*this, MD); 4843 4844 // C++11 [class.dtor]p5: 4845 // -- for a virtual destructor, lookup of the non-array deallocation function 4846 // results in an ambiguity or in a function that is deleted or inaccessible 4847 if (CSM == CXXDestructor && MD->isVirtual()) { 4848 FunctionDecl *OperatorDelete = 0; 4849 DeclarationName Name = 4850 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4851 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4852 OperatorDelete, false)) { 4853 if (Diagnose) 4854 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4855 return true; 4856 } 4857 } 4858 4859 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4860 4861 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4862 BE = RD->bases_end(); BI != BE; ++BI) 4863 if (!BI->isVirtual() && 4864 SMI.shouldDeleteForBase(BI)) 4865 return true; 4866 4867 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4868 BE = RD->vbases_end(); BI != BE; ++BI) 4869 if (SMI.shouldDeleteForBase(BI)) 4870 return true; 4871 4872 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4873 FE = RD->field_end(); FI != FE; ++FI) 4874 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4875 SMI.shouldDeleteForField(*FI)) 4876 return true; 4877 4878 if (SMI.shouldDeleteForAllConstMembers()) 4879 return true; 4880 4881 return false; 4882 } 4883 4884 /// Perform lookup for a special member of the specified kind, and determine 4885 /// whether it is trivial. If the triviality can be determined without the 4886 /// lookup, skip it. This is intended for use when determining whether a 4887 /// special member of a containing object is trivial, and thus does not ever 4888 /// perform overload resolution for default constructors. 4889 /// 4890 /// If \p Selected is not \c NULL, \c *Selected will be filled in with the 4891 /// member that was most likely to be intended to be trivial, if any. 4892 static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 4893 Sema::CXXSpecialMember CSM, unsigned Quals, 4894 CXXMethodDecl **Selected) { 4895 if (Selected) 4896 *Selected = 0; 4897 4898 switch (CSM) { 4899 case Sema::CXXInvalid: 4900 llvm_unreachable("not a special member"); 4901 4902 case Sema::CXXDefaultConstructor: 4903 // C++11 [class.ctor]p5: 4904 // A default constructor is trivial if: 4905 // - all the [direct subobjects] have trivial default constructors 4906 // 4907 // Note, no overload resolution is performed in this case. 4908 if (RD->hasTrivialDefaultConstructor()) 4909 return true; 4910 4911 if (Selected) { 4912 // If there's a default constructor which could have been trivial, dig it 4913 // out. Otherwise, if there's any user-provided default constructor, point 4914 // to that as an example of why there's not a trivial one. 4915 CXXConstructorDecl *DefCtor = 0; 4916 if (RD->needsImplicitDefaultConstructor()) 4917 S.DeclareImplicitDefaultConstructor(RD); 4918 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 4919 CE = RD->ctor_end(); CI != CE; ++CI) { 4920 if (!CI->isDefaultConstructor()) 4921 continue; 4922 DefCtor = *CI; 4923 if (!DefCtor->isUserProvided()) 4924 break; 4925 } 4926 4927 *Selected = DefCtor; 4928 } 4929 4930 return false; 4931 4932 case Sema::CXXDestructor: 4933 // C++11 [class.dtor]p5: 4934 // A destructor is trivial if: 4935 // - all the direct [subobjects] have trivial destructors 4936 if (RD->hasTrivialDestructor()) 4937 return true; 4938 4939 if (Selected) { 4940 if (RD->needsImplicitDestructor()) 4941 S.DeclareImplicitDestructor(RD); 4942 *Selected = RD->getDestructor(); 4943 } 4944 4945 return false; 4946 4947 case Sema::CXXCopyConstructor: 4948 // C++11 [class.copy]p12: 4949 // A copy constructor is trivial if: 4950 // - the constructor selected to copy each direct [subobject] is trivial 4951 if (RD->hasTrivialCopyConstructor()) { 4952 if (Quals == Qualifiers::Const) 4953 // We must either select the trivial copy constructor or reach an 4954 // ambiguity; no need to actually perform overload resolution. 4955 return true; 4956 } else if (!Selected) { 4957 return false; 4958 } 4959 // In C++98, we are not supposed to perform overload resolution here, but we 4960 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 4961 // cases like B as having a non-trivial copy constructor: 4962 // struct A { template<typename T> A(T&); }; 4963 // struct B { mutable A a; }; 4964 goto NeedOverloadResolution; 4965 4966 case Sema::CXXCopyAssignment: 4967 // C++11 [class.copy]p25: 4968 // A copy assignment operator is trivial if: 4969 // - the assignment operator selected to copy each direct [subobject] is 4970 // trivial 4971 if (RD->hasTrivialCopyAssignment()) { 4972 if (Quals == Qualifiers::Const) 4973 return true; 4974 } else if (!Selected) { 4975 return false; 4976 } 4977 // In C++98, we are not supposed to perform overload resolution here, but we 4978 // treat that as a language defect. 4979 goto NeedOverloadResolution; 4980 4981 case Sema::CXXMoveConstructor: 4982 case Sema::CXXMoveAssignment: 4983 NeedOverloadResolution: 4984 Sema::SpecialMemberOverloadResult *SMOR = 4985 S.LookupSpecialMember(RD, CSM, 4986 Quals & Qualifiers::Const, 4987 Quals & Qualifiers::Volatile, 4988 /*RValueThis*/false, /*ConstThis*/false, 4989 /*VolatileThis*/false); 4990 4991 // The standard doesn't describe how to behave if the lookup is ambiguous. 4992 // We treat it as not making the member non-trivial, just like the standard 4993 // mandates for the default constructor. This should rarely matter, because 4994 // the member will also be deleted. 4995 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4996 return true; 4997 4998 if (!SMOR->getMethod()) { 4999 assert(SMOR->getKind() == 5000 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5001 return false; 5002 } 5003 5004 // We deliberately don't check if we found a deleted special member. We're 5005 // not supposed to! 5006 if (Selected) 5007 *Selected = SMOR->getMethod(); 5008 return SMOR->getMethod()->isTrivial(); 5009 } 5010 5011 llvm_unreachable("unknown special method kind"); 5012 } 5013 5014 static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5015 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5016 CI != CE; ++CI) 5017 if (!CI->isImplicit()) 5018 return *CI; 5019 5020 // Look for constructor templates. 5021 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5022 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5023 if (CXXConstructorDecl *CD = 5024 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5025 return CD; 5026 } 5027 5028 return 0; 5029 } 5030 5031 /// The kind of subobject we are checking for triviality. The values of this 5032 /// enumeration are used in diagnostics. 5033 enum TrivialSubobjectKind { 5034 /// The subobject is a base class. 5035 TSK_BaseClass, 5036 /// The subobject is a non-static data member. 5037 TSK_Field, 5038 /// The object is actually the complete object. 5039 TSK_CompleteObject 5040 }; 5041 5042 /// Check whether the special member selected for a given type would be trivial. 5043 static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5044 QualType SubType, 5045 Sema::CXXSpecialMember CSM, 5046 TrivialSubobjectKind Kind, 5047 bool Diagnose) { 5048 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5049 if (!SubRD) 5050 return true; 5051 5052 CXXMethodDecl *Selected; 5053 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5054 Diagnose ? &Selected : 0)) 5055 return true; 5056 5057 if (Diagnose) { 5058 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5059 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5060 << Kind << SubType.getUnqualifiedType(); 5061 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5062 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5063 } else if (!Selected) 5064 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5065 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5066 else if (Selected->isUserProvided()) { 5067 if (Kind == TSK_CompleteObject) 5068 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5069 << Kind << SubType.getUnqualifiedType() << CSM; 5070 else { 5071 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5072 << Kind << SubType.getUnqualifiedType() << CSM; 5073 S.Diag(Selected->getLocation(), diag::note_declared_at); 5074 } 5075 } else { 5076 if (Kind != TSK_CompleteObject) 5077 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5078 << Kind << SubType.getUnqualifiedType() << CSM; 5079 5080 // Explain why the defaulted or deleted special member isn't trivial. 5081 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5082 } 5083 } 5084 5085 return false; 5086 } 5087 5088 /// Check whether the members of a class type allow a special member to be 5089 /// trivial. 5090 static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5091 Sema::CXXSpecialMember CSM, 5092 bool ConstArg, bool Diagnose) { 5093 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5094 FE = RD->field_end(); FI != FE; ++FI) { 5095 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5096 continue; 5097 5098 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5099 5100 // Pretend anonymous struct or union members are members of this class. 5101 if (FI->isAnonymousStructOrUnion()) { 5102 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5103 CSM, ConstArg, Diagnose)) 5104 return false; 5105 continue; 5106 } 5107 5108 // C++11 [class.ctor]p5: 5109 // A default constructor is trivial if [...] 5110 // -- no non-static data member of its class has a 5111 // brace-or-equal-initializer 5112 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5113 if (Diagnose) 5114 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5115 return false; 5116 } 5117 5118 // Objective C ARC 4.3.5: 5119 // [...] nontrivally ownership-qualified types are [...] not trivially 5120 // default constructible, copy constructible, move constructible, copy 5121 // assignable, move assignable, or destructible [...] 5122 if (S.getLangOpts().ObjCAutoRefCount && 5123 FieldType.hasNonTrivialObjCLifetime()) { 5124 if (Diagnose) 5125 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5126 << RD << FieldType.getObjCLifetime(); 5127 return false; 5128 } 5129 5130 if (ConstArg && !FI->isMutable()) 5131 FieldType.addConst(); 5132 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5133 TSK_Field, Diagnose)) 5134 return false; 5135 } 5136 5137 return true; 5138 } 5139 5140 /// Diagnose why the specified class does not have a trivial special member of 5141 /// the given kind. 5142 void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5143 QualType Ty = Context.getRecordType(RD); 5144 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5145 Ty.addConst(); 5146 5147 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5148 TSK_CompleteObject, /*Diagnose*/true); 5149 } 5150 5151 /// Determine whether a defaulted or deleted special member function is trivial, 5152 /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5153 /// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5154 bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5155 bool Diagnose) { 5156 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5157 5158 CXXRecordDecl *RD = MD->getParent(); 5159 5160 bool ConstArg = false; 5161 5162 // C++11 [class.copy]p12, p25: 5163 // A [special member] is trivial if its declared parameter type is the same 5164 // as if it had been implicitly declared [...] 5165 switch (CSM) { 5166 case CXXDefaultConstructor: 5167 case CXXDestructor: 5168 // Trivial default constructors and destructors cannot have parameters. 5169 break; 5170 5171 case CXXCopyConstructor: 5172 case CXXCopyAssignment: { 5173 // Trivial copy operations always have const, non-volatile parameter types. 5174 ConstArg = true; 5175 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5176 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5177 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5178 if (Diagnose) 5179 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5180 << Param0->getSourceRange() << Param0->getType() 5181 << Context.getLValueReferenceType( 5182 Context.getRecordType(RD).withConst()); 5183 return false; 5184 } 5185 break; 5186 } 5187 5188 case CXXMoveConstructor: 5189 case CXXMoveAssignment: { 5190 // Trivial move operations always have non-cv-qualified parameters. 5191 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5192 const RValueReferenceType *RT = 5193 Param0->getType()->getAs<RValueReferenceType>(); 5194 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5195 if (Diagnose) 5196 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5197 << Param0->getSourceRange() << Param0->getType() 5198 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5199 return false; 5200 } 5201 break; 5202 } 5203 5204 case CXXInvalid: 5205 llvm_unreachable("not a special member"); 5206 } 5207 5208 // FIXME: We require that the parameter-declaration-clause is equivalent to 5209 // that of an implicit declaration, not just that the declared parameter type 5210 // matches, in order to prevent absuridities like a function simultaneously 5211 // being a trivial copy constructor and a non-trivial default constructor. 5212 // This issue has not yet been assigned a core issue number. 5213 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5214 if (Diagnose) 5215 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5216 diag::note_nontrivial_default_arg) 5217 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5218 return false; 5219 } 5220 if (MD->isVariadic()) { 5221 if (Diagnose) 5222 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5223 return false; 5224 } 5225 5226 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5227 // A copy/move [constructor or assignment operator] is trivial if 5228 // -- the [member] selected to copy/move each direct base class subobject 5229 // is trivial 5230 // 5231 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5232 // A [default constructor or destructor] is trivial if 5233 // -- all the direct base classes have trivial [default constructors or 5234 // destructors] 5235 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5236 BE = RD->bases_end(); BI != BE; ++BI) 5237 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5238 ConstArg ? BI->getType().withConst() 5239 : BI->getType(), 5240 CSM, TSK_BaseClass, Diagnose)) 5241 return false; 5242 5243 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5244 // A copy/move [constructor or assignment operator] for a class X is 5245 // trivial if 5246 // -- for each non-static data member of X that is of class type (or array 5247 // thereof), the constructor selected to copy/move that member is 5248 // trivial 5249 // 5250 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5251 // A [default constructor or destructor] is trivial if 5252 // -- for all of the non-static data members of its class that are of class 5253 // type (or array thereof), each such class has a trivial [default 5254 // constructor or destructor] 5255 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5256 return false; 5257 5258 // C++11 [class.dtor]p5: 5259 // A destructor is trivial if [...] 5260 // -- the destructor is not virtual 5261 if (CSM == CXXDestructor && MD->isVirtual()) { 5262 if (Diagnose) 5263 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5264 return false; 5265 } 5266 5267 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5268 // A [special member] for class X is trivial if [...] 5269 // -- class X has no virtual functions and no virtual base classes 5270 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5271 if (!Diagnose) 5272 return false; 5273 5274 if (RD->getNumVBases()) { 5275 // Check for virtual bases. We already know that the corresponding 5276 // member in all bases is trivial, so vbases must all be direct. 5277 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5278 assert(BS.isVirtual()); 5279 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5280 return false; 5281 } 5282 5283 // Must have a virtual method. 5284 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5285 ME = RD->method_end(); MI != ME; ++MI) { 5286 if (MI->isVirtual()) { 5287 SourceLocation MLoc = MI->getLocStart(); 5288 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5289 return false; 5290 } 5291 } 5292 5293 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5294 } 5295 5296 // Looks like it's trivial! 5297 return true; 5298 } 5299 5300 /// \brief Data used with FindHiddenVirtualMethod 5301 namespace { 5302 struct FindHiddenVirtualMethodData { 5303 Sema *S; 5304 CXXMethodDecl *Method; 5305 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5306 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5307 }; 5308 } 5309 5310 /// \brief Check whether any most overriden method from MD in Methods 5311 static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5312 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5313 if (MD->size_overridden_methods() == 0) 5314 return Methods.count(MD->getCanonicalDecl()); 5315 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5316 E = MD->end_overridden_methods(); 5317 I != E; ++I) 5318 if (CheckMostOverridenMethods(*I, Methods)) 5319 return true; 5320 return false; 5321 } 5322 5323 /// \brief Member lookup function that determines whether a given C++ 5324 /// method overloads virtual methods in a base class without overriding any, 5325 /// to be used with CXXRecordDecl::lookupInBases(). 5326 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5327 CXXBasePath &Path, 5328 void *UserData) { 5329 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5330 5331 FindHiddenVirtualMethodData &Data 5332 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5333 5334 DeclarationName Name = Data.Method->getDeclName(); 5335 assert(Name.getNameKind() == DeclarationName::Identifier); 5336 5337 bool foundSameNameMethod = false; 5338 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5339 for (Path.Decls = BaseRecord->lookup(Name); 5340 !Path.Decls.empty(); 5341 Path.Decls = Path.Decls.slice(1)) { 5342 NamedDecl *D = Path.Decls.front(); 5343 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5344 MD = MD->getCanonicalDecl(); 5345 foundSameNameMethod = true; 5346 // Interested only in hidden virtual methods. 5347 if (!MD->isVirtual()) 5348 continue; 5349 // If the method we are checking overrides a method from its base 5350 // don't warn about the other overloaded methods. 5351 if (!Data.S->IsOverload(Data.Method, MD, false)) 5352 return true; 5353 // Collect the overload only if its hidden. 5354 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5355 overloadedMethods.push_back(MD); 5356 } 5357 } 5358 5359 if (foundSameNameMethod) 5360 Data.OverloadedMethods.append(overloadedMethods.begin(), 5361 overloadedMethods.end()); 5362 return foundSameNameMethod; 5363 } 5364 5365 /// \brief Add the most overriden methods from MD to Methods 5366 static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5367 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5368 if (MD->size_overridden_methods() == 0) 5369 Methods.insert(MD->getCanonicalDecl()); 5370 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5371 E = MD->end_overridden_methods(); 5372 I != E; ++I) 5373 AddMostOverridenMethods(*I, Methods); 5374 } 5375 5376 /// \brief See if a method overloads virtual methods in a base class without 5377 /// overriding any. 5378 void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5379 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5380 MD->getLocation()) == DiagnosticsEngine::Ignored) 5381 return; 5382 if (!MD->getDeclName().isIdentifier()) 5383 return; 5384 5385 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5386 /*bool RecordPaths=*/false, 5387 /*bool DetectVirtual=*/false); 5388 FindHiddenVirtualMethodData Data; 5389 Data.Method = MD; 5390 Data.S = this; 5391 5392 // Keep the base methods that were overriden or introduced in the subclass 5393 // by 'using' in a set. A base method not in this set is hidden. 5394 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5395 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5396 NamedDecl *ND = *I; 5397 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5398 ND = shad->getTargetDecl(); 5399 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5400 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5401 } 5402 5403 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5404 !Data.OverloadedMethods.empty()) { 5405 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5406 << MD << (Data.OverloadedMethods.size() > 1); 5407 5408 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5409 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5410 Diag(overloadedMD->getLocation(), 5411 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5412 } 5413 } 5414 } 5415 5416 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5417 Decl *TagDecl, 5418 SourceLocation LBrac, 5419 SourceLocation RBrac, 5420 AttributeList *AttrList) { 5421 if (!TagDecl) 5422 return; 5423 5424 AdjustDeclIfTemplate(TagDecl); 5425 5426 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5427 if (l->getKind() != AttributeList::AT_Visibility) 5428 continue; 5429 l->setInvalid(); 5430 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5431 l->getName(); 5432 } 5433 5434 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5435 // strict aliasing violation! 5436 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5437 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5438 5439 CheckCompletedCXXClass( 5440 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5441 } 5442 5443 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5444 /// special functions, such as the default constructor, copy 5445 /// constructor, or destructor, to the given C++ class (C++ 5446 /// [special]p1). This routine can only be executed just before the 5447 /// definition of the class is complete. 5448 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5449 if (!ClassDecl->hasUserDeclaredConstructor()) 5450 ++ASTContext::NumImplicitDefaultConstructors; 5451 5452 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5453 ++ASTContext::NumImplicitCopyConstructors; 5454 5455 // If the properties or semantics of the copy constructor couldn't be 5456 // determined while the class was being declared, force a declaration 5457 // of it now. 5458 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5459 DeclareImplicitCopyConstructor(ClassDecl); 5460 } 5461 5462 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5463 ++ASTContext::NumImplicitMoveConstructors; 5464 5465 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5466 DeclareImplicitMoveConstructor(ClassDecl); 5467 } 5468 5469 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5470 ++ASTContext::NumImplicitCopyAssignmentOperators; 5471 5472 // If we have a dynamic class, then the copy assignment operator may be 5473 // virtual, so we have to declare it immediately. This ensures that, e.g., 5474 // it shows up in the right place in the vtable and that we diagnose 5475 // problems with the implicit exception specification. 5476 if (ClassDecl->isDynamicClass() || 5477 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5478 DeclareImplicitCopyAssignment(ClassDecl); 5479 } 5480 5481 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5482 ++ASTContext::NumImplicitMoveAssignmentOperators; 5483 5484 // Likewise for the move assignment operator. 5485 if (ClassDecl->isDynamicClass() || 5486 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5487 DeclareImplicitMoveAssignment(ClassDecl); 5488 } 5489 5490 if (!ClassDecl->hasUserDeclaredDestructor()) { 5491 ++ASTContext::NumImplicitDestructors; 5492 5493 // If we have a dynamic class, then the destructor may be virtual, so we 5494 // have to declare the destructor immediately. This ensures that, e.g., it 5495 // shows up in the right place in the vtable and that we diagnose problems 5496 // with the implicit exception specification. 5497 if (ClassDecl->isDynamicClass() || 5498 ClassDecl->needsOverloadResolutionForDestructor()) 5499 DeclareImplicitDestructor(ClassDecl); 5500 } 5501 } 5502 5503 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5504 if (!D) 5505 return; 5506 5507 int NumParamList = D->getNumTemplateParameterLists(); 5508 for (int i = 0; i < NumParamList; i++) { 5509 TemplateParameterList* Params = D->getTemplateParameterList(i); 5510 for (TemplateParameterList::iterator Param = Params->begin(), 5511 ParamEnd = Params->end(); 5512 Param != ParamEnd; ++Param) { 5513 NamedDecl *Named = cast<NamedDecl>(*Param); 5514 if (Named->getDeclName()) { 5515 S->AddDecl(Named); 5516 IdResolver.AddDecl(Named); 5517 } 5518 } 5519 } 5520 } 5521 5522 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5523 if (!D) 5524 return; 5525 5526 TemplateParameterList *Params = 0; 5527 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5528 Params = Template->getTemplateParameters(); 5529 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5530 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5531 Params = PartialSpec->getTemplateParameters(); 5532 else 5533 return; 5534 5535 for (TemplateParameterList::iterator Param = Params->begin(), 5536 ParamEnd = Params->end(); 5537 Param != ParamEnd; ++Param) { 5538 NamedDecl *Named = cast<NamedDecl>(*Param); 5539 if (Named->getDeclName()) { 5540 S->AddDecl(Named); 5541 IdResolver.AddDecl(Named); 5542 } 5543 } 5544 } 5545 5546 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5547 if (!RecordD) return; 5548 AdjustDeclIfTemplate(RecordD); 5549 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5550 PushDeclContext(S, Record); 5551 } 5552 5553 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5554 if (!RecordD) return; 5555 PopDeclContext(); 5556 } 5557 5558 /// ActOnStartDelayedCXXMethodDeclaration - We have completed 5559 /// parsing a top-level (non-nested) C++ class, and we are now 5560 /// parsing those parts of the given Method declaration that could 5561 /// not be parsed earlier (C++ [class.mem]p2), such as default 5562 /// arguments. This action should enter the scope of the given 5563 /// Method declaration as if we had just parsed the qualified method 5564 /// name. However, it should not bring the parameters into scope; 5565 /// that will be performed by ActOnDelayedCXXMethodParameter. 5566 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5567 } 5568 5569 /// ActOnDelayedCXXMethodParameter - We've already started a delayed 5570 /// C++ method declaration. We're (re-)introducing the given 5571 /// function parameter into scope for use in parsing later parts of 5572 /// the method declaration. For example, we could see an 5573 /// ActOnParamDefaultArgument event for this parameter. 5574 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5575 if (!ParamD) 5576 return; 5577 5578 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5579 5580 // If this parameter has an unparsed default argument, clear it out 5581 // to make way for the parsed default argument. 5582 if (Param->hasUnparsedDefaultArg()) 5583 Param->setDefaultArg(0); 5584 5585 S->AddDecl(Param); 5586 if (Param->getDeclName()) 5587 IdResolver.AddDecl(Param); 5588 } 5589 5590 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5591 /// processing the delayed method declaration for Method. The method 5592 /// declaration is now considered finished. There may be a separate 5593 /// ActOnStartOfFunctionDef action later (not necessarily 5594 /// immediately!) for this method, if it was also defined inside the 5595 /// class body. 5596 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5597 if (!MethodD) 5598 return; 5599 5600 AdjustDeclIfTemplate(MethodD); 5601 5602 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5603 5604 // Now that we have our default arguments, check the constructor 5605 // again. It could produce additional diagnostics or affect whether 5606 // the class has implicitly-declared destructors, among other 5607 // things. 5608 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5609 CheckConstructor(Constructor); 5610 5611 // Check the default arguments, which we may have added. 5612 if (!Method->isInvalidDecl()) 5613 CheckCXXDefaultArguments(Method); 5614 } 5615 5616 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5617 /// the well-formedness of the constructor declarator @p D with type @p 5618 /// R. If there are any errors in the declarator, this routine will 5619 /// emit diagnostics and set the invalid bit to true. In any case, the type 5620 /// will be updated to reflect a well-formed type for the constructor and 5621 /// returned. 5622 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5623 StorageClass &SC) { 5624 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5625 5626 // C++ [class.ctor]p3: 5627 // A constructor shall not be virtual (10.3) or static (9.4). A 5628 // constructor can be invoked for a const, volatile or const 5629 // volatile object. A constructor shall not be declared const, 5630 // volatile, or const volatile (9.3.2). 5631 if (isVirtual) { 5632 if (!D.isInvalidType()) 5633 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5634 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5635 << SourceRange(D.getIdentifierLoc()); 5636 D.setInvalidType(); 5637 } 5638 if (SC == SC_Static) { 5639 if (!D.isInvalidType()) 5640 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5641 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5642 << SourceRange(D.getIdentifierLoc()); 5643 D.setInvalidType(); 5644 SC = SC_None; 5645 } 5646 5647 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5648 if (FTI.TypeQuals != 0) { 5649 if (FTI.TypeQuals & Qualifiers::Const) 5650 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5651 << "const" << SourceRange(D.getIdentifierLoc()); 5652 if (FTI.TypeQuals & Qualifiers::Volatile) 5653 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5654 << "volatile" << SourceRange(D.getIdentifierLoc()); 5655 if (FTI.TypeQuals & Qualifiers::Restrict) 5656 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5657 << "restrict" << SourceRange(D.getIdentifierLoc()); 5658 D.setInvalidType(); 5659 } 5660 5661 // C++0x [class.ctor]p4: 5662 // A constructor shall not be declared with a ref-qualifier. 5663 if (FTI.hasRefQualifier()) { 5664 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5665 << FTI.RefQualifierIsLValueRef 5666 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5667 D.setInvalidType(); 5668 } 5669 5670 // Rebuild the function type "R" without any type qualifiers (in 5671 // case any of the errors above fired) and with "void" as the 5672 // return type, since constructors don't have return types. 5673 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5674 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5675 return R; 5676 5677 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5678 EPI.TypeQuals = 0; 5679 EPI.RefQualifier = RQ_None; 5680 5681 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5682 } 5683 5684 /// CheckConstructor - Checks a fully-formed constructor for 5685 /// well-formedness, issuing any diagnostics required. Returns true if 5686 /// the constructor declarator is invalid. 5687 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5688 CXXRecordDecl *ClassDecl 5689 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5690 if (!ClassDecl) 5691 return Constructor->setInvalidDecl(); 5692 5693 // C++ [class.copy]p3: 5694 // A declaration of a constructor for a class X is ill-formed if 5695 // its first parameter is of type (optionally cv-qualified) X and 5696 // either there are no other parameters or else all other 5697 // parameters have default arguments. 5698 if (!Constructor->isInvalidDecl() && 5699 ((Constructor->getNumParams() == 1) || 5700 (Constructor->getNumParams() > 1 && 5701 Constructor->getParamDecl(1)->hasDefaultArg())) && 5702 Constructor->getTemplateSpecializationKind() 5703 != TSK_ImplicitInstantiation) { 5704 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5705 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5706 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5707 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5708 const char *ConstRef 5709 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5710 : " const &"; 5711 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5712 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5713 5714 // FIXME: Rather that making the constructor invalid, we should endeavor 5715 // to fix the type. 5716 Constructor->setInvalidDecl(); 5717 } 5718 } 5719 } 5720 5721 /// CheckDestructor - Checks a fully-formed destructor definition for 5722 /// well-formedness, issuing any diagnostics required. Returns true 5723 /// on error. 5724 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5725 CXXRecordDecl *RD = Destructor->getParent(); 5726 5727 if (Destructor->isVirtual()) { 5728 SourceLocation Loc; 5729 5730 if (!Destructor->isImplicit()) 5731 Loc = Destructor->getLocation(); 5732 else 5733 Loc = RD->getLocation(); 5734 5735 // If we have a virtual destructor, look up the deallocation function 5736 FunctionDecl *OperatorDelete = 0; 5737 DeclarationName Name = 5738 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5739 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5740 return true; 5741 5742 MarkFunctionReferenced(Loc, OperatorDelete); 5743 5744 Destructor->setOperatorDelete(OperatorDelete); 5745 } 5746 5747 return false; 5748 } 5749 5750 static inline bool 5751 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5752 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5753 FTI.ArgInfo[0].Param && 5754 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5755 } 5756 5757 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5758 /// the well-formednes of the destructor declarator @p D with type @p 5759 /// R. If there are any errors in the declarator, this routine will 5760 /// emit diagnostics and set the declarator to invalid. Even if this happens, 5761 /// will be updated to reflect a well-formed type for the destructor and 5762 /// returned. 5763 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5764 StorageClass& SC) { 5765 // C++ [class.dtor]p1: 5766 // [...] A typedef-name that names a class is a class-name 5767 // (7.1.3); however, a typedef-name that names a class shall not 5768 // be used as the identifier in the declarator for a destructor 5769 // declaration. 5770 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5771 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5772 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5773 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5774 else if (const TemplateSpecializationType *TST = 5775 DeclaratorType->getAs<TemplateSpecializationType>()) 5776 if (TST->isTypeAlias()) 5777 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5778 << DeclaratorType << 1; 5779 5780 // C++ [class.dtor]p2: 5781 // A destructor is used to destroy objects of its class type. A 5782 // destructor takes no parameters, and no return type can be 5783 // specified for it (not even void). The address of a destructor 5784 // shall not be taken. A destructor shall not be static. A 5785 // destructor can be invoked for a const, volatile or const 5786 // volatile object. A destructor shall not be declared const, 5787 // volatile or const volatile (9.3.2). 5788 if (SC == SC_Static) { 5789 if (!D.isInvalidType()) 5790 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5791 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5792 << SourceRange(D.getIdentifierLoc()) 5793 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5794 5795 SC = SC_None; 5796 } 5797 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5798 // Destructors don't have return types, but the parser will 5799 // happily parse something like: 5800 // 5801 // class X { 5802 // float ~X(); 5803 // }; 5804 // 5805 // The return type will be eliminated later. 5806 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5807 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5808 << SourceRange(D.getIdentifierLoc()); 5809 } 5810 5811 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5812 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5813 if (FTI.TypeQuals & Qualifiers::Const) 5814 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5815 << "const" << SourceRange(D.getIdentifierLoc()); 5816 if (FTI.TypeQuals & Qualifiers::Volatile) 5817 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5818 << "volatile" << SourceRange(D.getIdentifierLoc()); 5819 if (FTI.TypeQuals & Qualifiers::Restrict) 5820 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5821 << "restrict" << SourceRange(D.getIdentifierLoc()); 5822 D.setInvalidType(); 5823 } 5824 5825 // C++0x [class.dtor]p2: 5826 // A destructor shall not be declared with a ref-qualifier. 5827 if (FTI.hasRefQualifier()) { 5828 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5829 << FTI.RefQualifierIsLValueRef 5830 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5831 D.setInvalidType(); 5832 } 5833 5834 // Make sure we don't have any parameters. 5835 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5836 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5837 5838 // Delete the parameters. 5839 FTI.freeArgs(); 5840 D.setInvalidType(); 5841 } 5842 5843 // Make sure the destructor isn't variadic. 5844 if (FTI.isVariadic) { 5845 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5846 D.setInvalidType(); 5847 } 5848 5849 // Rebuild the function type "R" without any type qualifiers or 5850 // parameters (in case any of the errors above fired) and with 5851 // "void" as the return type, since destructors don't have return 5852 // types. 5853 if (!D.isInvalidType()) 5854 return R; 5855 5856 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5857 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5858 EPI.Variadic = false; 5859 EPI.TypeQuals = 0; 5860 EPI.RefQualifier = RQ_None; 5861 return Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI); 5862 } 5863 5864 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5865 /// well-formednes of the conversion function declarator @p D with 5866 /// type @p R. If there are any errors in the declarator, this routine 5867 /// will emit diagnostics and return true. Otherwise, it will return 5868 /// false. Either way, the type @p R will be updated to reflect a 5869 /// well-formed type for the conversion operator. 5870 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5871 StorageClass& SC) { 5872 // C++ [class.conv.fct]p1: 5873 // Neither parameter types nor return type can be specified. The 5874 // type of a conversion function (8.3.5) is "function taking no 5875 // parameter returning conversion-type-id." 5876 if (SC == SC_Static) { 5877 if (!D.isInvalidType()) 5878 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5879 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5880 << SourceRange(D.getIdentifierLoc()); 5881 D.setInvalidType(); 5882 SC = SC_None; 5883 } 5884 5885 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5886 5887 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5888 // Conversion functions don't have return types, but the parser will 5889 // happily parse something like: 5890 // 5891 // class X { 5892 // float operator bool(); 5893 // }; 5894 // 5895 // The return type will be changed later anyway. 5896 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5897 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5898 << SourceRange(D.getIdentifierLoc()); 5899 D.setInvalidType(); 5900 } 5901 5902 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5903 5904 // Make sure we don't have any parameters. 5905 if (Proto->getNumArgs() > 0) { 5906 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5907 5908 // Delete the parameters. 5909 D.getFunctionTypeInfo().freeArgs(); 5910 D.setInvalidType(); 5911 } else if (Proto->isVariadic()) { 5912 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5913 D.setInvalidType(); 5914 } 5915 5916 // Diagnose "&operator bool()" and other such nonsense. This 5917 // is actually a gcc extension which we don't support. 5918 if (Proto->getResultType() != ConvType) { 5919 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5920 << Proto->getResultType(); 5921 D.setInvalidType(); 5922 ConvType = Proto->getResultType(); 5923 } 5924 5925 // C++ [class.conv.fct]p4: 5926 // The conversion-type-id shall not represent a function type nor 5927 // an array type. 5928 if (ConvType->isArrayType()) { 5929 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5930 ConvType = Context.getPointerType(ConvType); 5931 D.setInvalidType(); 5932 } else if (ConvType->isFunctionType()) { 5933 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5934 ConvType = Context.getPointerType(ConvType); 5935 D.setInvalidType(); 5936 } 5937 5938 // Rebuild the function type "R" without any parameters (in case any 5939 // of the errors above fired) and with the conversion type as the 5940 // return type. 5941 if (D.isInvalidType()) 5942 R = Context.getFunctionType(ConvType, ArrayRef<QualType>(), 5943 Proto->getExtProtoInfo()); 5944 5945 // C++0x explicit conversion operators. 5946 if (D.getDeclSpec().isExplicitSpecified()) 5947 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5948 getLangOpts().CPlusPlus11 ? 5949 diag::warn_cxx98_compat_explicit_conversion_functions : 5950 diag::ext_explicit_conversion_functions) 5951 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5952 } 5953 5954 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5955 /// the declaration of the given C++ conversion function. This routine 5956 /// is responsible for recording the conversion function in the C++ 5957 /// class, if possible. 5958 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5959 assert(Conversion && "Expected to receive a conversion function declaration"); 5960 5961 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5962 5963 // Make sure we aren't redeclaring the conversion function. 5964 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5965 5966 // C++ [class.conv.fct]p1: 5967 // [...] A conversion function is never used to convert a 5968 // (possibly cv-qualified) object to the (possibly cv-qualified) 5969 // same object type (or a reference to it), to a (possibly 5970 // cv-qualified) base class of that type (or a reference to it), 5971 // or to (possibly cv-qualified) void. 5972 // FIXME: Suppress this warning if the conversion function ends up being a 5973 // virtual function that overrides a virtual function in a base class. 5974 QualType ClassType 5975 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5976 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5977 ConvType = ConvTypeRef->getPointeeType(); 5978 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5979 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5980 /* Suppress diagnostics for instantiations. */; 5981 else if (ConvType->isRecordType()) { 5982 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5983 if (ConvType == ClassType) 5984 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5985 << ClassType; 5986 else if (IsDerivedFrom(ClassType, ConvType)) 5987 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5988 << ClassType << ConvType; 5989 } else if (ConvType->isVoidType()) { 5990 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5991 << ClassType << ConvType; 5992 } 5993 5994 if (FunctionTemplateDecl *ConversionTemplate 5995 = Conversion->getDescribedFunctionTemplate()) 5996 return ConversionTemplate; 5997 5998 return Conversion; 5999 } 6000 6001 //===----------------------------------------------------------------------===// 6002 // Namespace Handling 6003 //===----------------------------------------------------------------------===// 6004 6005 /// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6006 /// reopened. 6007 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6008 SourceLocation Loc, 6009 IdentifierInfo *II, bool *IsInline, 6010 NamespaceDecl *PrevNS) { 6011 assert(*IsInline != PrevNS->isInline()); 6012 6013 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6014 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6015 // inline namespaces, with the intention of bringing names into namespace std. 6016 // 6017 // We support this just well enough to get that case working; this is not 6018 // sufficient to support reopening namespaces as inline in general. 6019 if (*IsInline && II && II->getName().startswith("__atomic") && 6020 S.getSourceManager().isInSystemHeader(Loc)) { 6021 // Mark all prior declarations of the namespace as inline. 6022 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6023 NS = NS->getPreviousDecl()) 6024 NS->setInline(*IsInline); 6025 // Patch up the lookup table for the containing namespace. This isn't really 6026 // correct, but it's good enough for this particular case. 6027 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6028 E = PrevNS->decls_end(); I != E; ++I) 6029 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6030 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6031 return; 6032 } 6033 6034 if (PrevNS->isInline()) 6035 // The user probably just forgot the 'inline', so suggest that it 6036 // be added back. 6037 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6038 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6039 else 6040 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6041 << IsInline; 6042 6043 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6044 *IsInline = PrevNS->isInline(); 6045 } 6046 6047 /// ActOnStartNamespaceDef - This is called at the start of a namespace 6048 /// definition. 6049 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6050 SourceLocation InlineLoc, 6051 SourceLocation NamespaceLoc, 6052 SourceLocation IdentLoc, 6053 IdentifierInfo *II, 6054 SourceLocation LBrace, 6055 AttributeList *AttrList) { 6056 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6057 // For anonymous namespace, take the location of the left brace. 6058 SourceLocation Loc = II ? IdentLoc : LBrace; 6059 bool IsInline = InlineLoc.isValid(); 6060 bool IsInvalid = false; 6061 bool IsStd = false; 6062 bool AddToKnown = false; 6063 Scope *DeclRegionScope = NamespcScope->getParent(); 6064 6065 NamespaceDecl *PrevNS = 0; 6066 if (II) { 6067 // C++ [namespace.def]p2: 6068 // The identifier in an original-namespace-definition shall not 6069 // have been previously defined in the declarative region in 6070 // which the original-namespace-definition appears. The 6071 // identifier in an original-namespace-definition is the name of 6072 // the namespace. Subsequently in that declarative region, it is 6073 // treated as an original-namespace-name. 6074 // 6075 // Since namespace names are unique in their scope, and we don't 6076 // look through using directives, just look for any ordinary names. 6077 6078 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6079 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6080 Decl::IDNS_Namespace; 6081 NamedDecl *PrevDecl = 0; 6082 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6083 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6084 ++I) { 6085 if ((*I)->getIdentifierNamespace() & IDNS) { 6086 PrevDecl = *I; 6087 break; 6088 } 6089 } 6090 6091 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6092 6093 if (PrevNS) { 6094 // This is an extended namespace definition. 6095 if (IsInline != PrevNS->isInline()) 6096 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6097 &IsInline, PrevNS); 6098 } else if (PrevDecl) { 6099 // This is an invalid name redefinition. 6100 Diag(Loc, diag::err_redefinition_different_kind) 6101 << II; 6102 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6103 IsInvalid = true; 6104 // Continue on to push Namespc as current DeclContext and return it. 6105 } else if (II->isStr("std") && 6106 CurContext->getRedeclContext()->isTranslationUnit()) { 6107 // This is the first "real" definition of the namespace "std", so update 6108 // our cache of the "std" namespace to point at this definition. 6109 PrevNS = getStdNamespace(); 6110 IsStd = true; 6111 AddToKnown = !IsInline; 6112 } else { 6113 // We've seen this namespace for the first time. 6114 AddToKnown = !IsInline; 6115 } 6116 } else { 6117 // Anonymous namespaces. 6118 6119 // Determine whether the parent already has an anonymous namespace. 6120 DeclContext *Parent = CurContext->getRedeclContext(); 6121 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6122 PrevNS = TU->getAnonymousNamespace(); 6123 } else { 6124 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6125 PrevNS = ND->getAnonymousNamespace(); 6126 } 6127 6128 if (PrevNS && IsInline != PrevNS->isInline()) 6129 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6130 &IsInline, PrevNS); 6131 } 6132 6133 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6134 StartLoc, Loc, II, PrevNS); 6135 if (IsInvalid) 6136 Namespc->setInvalidDecl(); 6137 6138 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6139 6140 // FIXME: Should we be merging attributes? 6141 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6142 PushNamespaceVisibilityAttr(Attr, Loc); 6143 6144 if (IsStd) 6145 StdNamespace = Namespc; 6146 if (AddToKnown) 6147 KnownNamespaces[Namespc] = false; 6148 6149 if (II) { 6150 PushOnScopeChains(Namespc, DeclRegionScope); 6151 } else { 6152 // Link the anonymous namespace into its parent. 6153 DeclContext *Parent = CurContext->getRedeclContext(); 6154 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6155 TU->setAnonymousNamespace(Namespc); 6156 } else { 6157 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6158 } 6159 6160 CurContext->addDecl(Namespc); 6161 6162 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6163 // behaves as if it were replaced by 6164 // namespace unique { /* empty body */ } 6165 // using namespace unique; 6166 // namespace unique { namespace-body } 6167 // where all occurrences of 'unique' in a translation unit are 6168 // replaced by the same identifier and this identifier differs 6169 // from all other identifiers in the entire program. 6170 6171 // We just create the namespace with an empty name and then add an 6172 // implicit using declaration, just like the standard suggests. 6173 // 6174 // CodeGen enforces the "universally unique" aspect by giving all 6175 // declarations semantically contained within an anonymous 6176 // namespace internal linkage. 6177 6178 if (!PrevNS) { 6179 UsingDirectiveDecl* UD 6180 = UsingDirectiveDecl::Create(Context, Parent, 6181 /* 'using' */ LBrace, 6182 /* 'namespace' */ SourceLocation(), 6183 /* qualifier */ NestedNameSpecifierLoc(), 6184 /* identifier */ SourceLocation(), 6185 Namespc, 6186 /* Ancestor */ Parent); 6187 UD->setImplicit(); 6188 Parent->addDecl(UD); 6189 } 6190 } 6191 6192 ActOnDocumentableDecl(Namespc); 6193 6194 // Although we could have an invalid decl (i.e. the namespace name is a 6195 // redefinition), push it as current DeclContext and try to continue parsing. 6196 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6197 // for the namespace has the declarations that showed up in that particular 6198 // namespace definition. 6199 PushDeclContext(NamespcScope, Namespc); 6200 return Namespc; 6201 } 6202 6203 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6204 /// is a namespace alias, returns the namespace it points to. 6205 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6206 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6207 return AD->getNamespace(); 6208 return dyn_cast_or_null<NamespaceDecl>(D); 6209 } 6210 6211 /// ActOnFinishNamespaceDef - This callback is called after a namespace is 6212 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6213 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6214 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6215 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6216 Namespc->setRBraceLoc(RBrace); 6217 PopDeclContext(); 6218 if (Namespc->hasAttr<VisibilityAttr>()) 6219 PopPragmaVisibility(true, RBrace); 6220 } 6221 6222 CXXRecordDecl *Sema::getStdBadAlloc() const { 6223 return cast_or_null<CXXRecordDecl>( 6224 StdBadAlloc.get(Context.getExternalSource())); 6225 } 6226 6227 NamespaceDecl *Sema::getStdNamespace() const { 6228 return cast_or_null<NamespaceDecl>( 6229 StdNamespace.get(Context.getExternalSource())); 6230 } 6231 6232 /// \brief Retrieve the special "std" namespace, which may require us to 6233 /// implicitly define the namespace. 6234 NamespaceDecl *Sema::getOrCreateStdNamespace() { 6235 if (!StdNamespace) { 6236 // The "std" namespace has not yet been defined, so build one implicitly. 6237 StdNamespace = NamespaceDecl::Create(Context, 6238 Context.getTranslationUnitDecl(), 6239 /*Inline=*/false, 6240 SourceLocation(), SourceLocation(), 6241 &PP.getIdentifierTable().get("std"), 6242 /*PrevDecl=*/0); 6243 getStdNamespace()->setImplicit(true); 6244 } 6245 6246 return getStdNamespace(); 6247 } 6248 6249 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6250 assert(getLangOpts().CPlusPlus && 6251 "Looking for std::initializer_list outside of C++."); 6252 6253 // We're looking for implicit instantiations of 6254 // template <typename E> class std::initializer_list. 6255 6256 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6257 return false; 6258 6259 ClassTemplateDecl *Template = 0; 6260 const TemplateArgument *Arguments = 0; 6261 6262 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6263 6264 ClassTemplateSpecializationDecl *Specialization = 6265 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6266 if (!Specialization) 6267 return false; 6268 6269 Template = Specialization->getSpecializedTemplate(); 6270 Arguments = Specialization->getTemplateArgs().data(); 6271 } else if (const TemplateSpecializationType *TST = 6272 Ty->getAs<TemplateSpecializationType>()) { 6273 Template = dyn_cast_or_null<ClassTemplateDecl>( 6274 TST->getTemplateName().getAsTemplateDecl()); 6275 Arguments = TST->getArgs(); 6276 } 6277 if (!Template) 6278 return false; 6279 6280 if (!StdInitializerList) { 6281 // Haven't recognized std::initializer_list yet, maybe this is it. 6282 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6283 if (TemplateClass->getIdentifier() != 6284 &PP.getIdentifierTable().get("initializer_list") || 6285 !getStdNamespace()->InEnclosingNamespaceSetOf( 6286 TemplateClass->getDeclContext())) 6287 return false; 6288 // This is a template called std::initializer_list, but is it the right 6289 // template? 6290 TemplateParameterList *Params = Template->getTemplateParameters(); 6291 if (Params->getMinRequiredArguments() != 1) 6292 return false; 6293 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6294 return false; 6295 6296 // It's the right template. 6297 StdInitializerList = Template; 6298 } 6299 6300 if (Template != StdInitializerList) 6301 return false; 6302 6303 // This is an instance of std::initializer_list. Find the argument type. 6304 if (Element) 6305 *Element = Arguments[0].getAsType(); 6306 return true; 6307 } 6308 6309 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6310 NamespaceDecl *Std = S.getStdNamespace(); 6311 if (!Std) { 6312 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6313 return 0; 6314 } 6315 6316 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6317 Loc, Sema::LookupOrdinaryName); 6318 if (!S.LookupQualifiedName(Result, Std)) { 6319 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6320 return 0; 6321 } 6322 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6323 if (!Template) { 6324 Result.suppressDiagnostics(); 6325 // We found something weird. Complain about the first thing we found. 6326 NamedDecl *Found = *Result.begin(); 6327 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6328 return 0; 6329 } 6330 6331 // We found some template called std::initializer_list. Now verify that it's 6332 // correct. 6333 TemplateParameterList *Params = Template->getTemplateParameters(); 6334 if (Params->getMinRequiredArguments() != 1 || 6335 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6336 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6337 return 0; 6338 } 6339 6340 return Template; 6341 } 6342 6343 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6344 if (!StdInitializerList) { 6345 StdInitializerList = LookupStdInitializerList(*this, Loc); 6346 if (!StdInitializerList) 6347 return QualType(); 6348 } 6349 6350 TemplateArgumentListInfo Args(Loc, Loc); 6351 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6352 Context.getTrivialTypeSourceInfo(Element, 6353 Loc))); 6354 return Context.getCanonicalType( 6355 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6356 } 6357 6358 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6359 // C++ [dcl.init.list]p2: 6360 // A constructor is an initializer-list constructor if its first parameter 6361 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6362 // std::initializer_list<E> for some type E, and either there are no other 6363 // parameters or else all other parameters have default arguments. 6364 if (Ctor->getNumParams() < 1 || 6365 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6366 return false; 6367 6368 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6369 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6370 ArgType = RT->getPointeeType().getUnqualifiedType(); 6371 6372 return isStdInitializerList(ArgType, 0); 6373 } 6374 6375 /// \brief Determine whether a using statement is in a context where it will be 6376 /// apply in all contexts. 6377 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6378 switch (CurContext->getDeclKind()) { 6379 case Decl::TranslationUnit: 6380 return true; 6381 case Decl::LinkageSpec: 6382 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6383 default: 6384 return false; 6385 } 6386 } 6387 6388 namespace { 6389 6390 // Callback to only accept typo corrections that are namespaces. 6391 class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6392 public: 6393 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6394 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6395 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6396 } 6397 return false; 6398 } 6399 }; 6400 6401 } 6402 6403 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6404 CXXScopeSpec &SS, 6405 SourceLocation IdentLoc, 6406 IdentifierInfo *Ident) { 6407 NamespaceValidatorCCC Validator; 6408 R.clear(); 6409 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6410 R.getLookupKind(), Sc, &SS, 6411 Validator)) { 6412 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6413 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6414 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6415 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6416 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6417 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6418 CorrectedStr); 6419 else 6420 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6421 << Ident << CorrectedQuotedStr 6422 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6423 6424 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6425 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6426 6427 R.addDecl(Corrected.getCorrectionDecl()); 6428 return true; 6429 } 6430 return false; 6431 } 6432 6433 Decl *Sema::ActOnUsingDirective(Scope *S, 6434 SourceLocation UsingLoc, 6435 SourceLocation NamespcLoc, 6436 CXXScopeSpec &SS, 6437 SourceLocation IdentLoc, 6438 IdentifierInfo *NamespcName, 6439 AttributeList *AttrList) { 6440 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6441 assert(NamespcName && "Invalid NamespcName."); 6442 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6443 6444 // This can only happen along a recovery path. 6445 while (S->getFlags() & Scope::TemplateParamScope) 6446 S = S->getParent(); 6447 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6448 6449 UsingDirectiveDecl *UDir = 0; 6450 NestedNameSpecifier *Qualifier = 0; 6451 if (SS.isSet()) 6452 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6453 6454 // Lookup namespace name. 6455 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6456 LookupParsedName(R, S, &SS); 6457 if (R.isAmbiguous()) 6458 return 0; 6459 6460 if (R.empty()) { 6461 R.clear(); 6462 // Allow "using namespace std;" or "using namespace ::std;" even if 6463 // "std" hasn't been defined yet, for GCC compatibility. 6464 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6465 NamespcName->isStr("std")) { 6466 Diag(IdentLoc, diag::ext_using_undefined_std); 6467 R.addDecl(getOrCreateStdNamespace()); 6468 R.resolveKind(); 6469 } 6470 // Otherwise, attempt typo correction. 6471 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6472 } 6473 6474 if (!R.empty()) { 6475 NamedDecl *Named = R.getFoundDecl(); 6476 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6477 && "expected namespace decl"); 6478 // C++ [namespace.udir]p1: 6479 // A using-directive specifies that the names in the nominated 6480 // namespace can be used in the scope in which the 6481 // using-directive appears after the using-directive. During 6482 // unqualified name lookup (3.4.1), the names appear as if they 6483 // were declared in the nearest enclosing namespace which 6484 // contains both the using-directive and the nominated 6485 // namespace. [Note: in this context, "contains" means "contains 6486 // directly or indirectly". ] 6487 6488 // Find enclosing context containing both using-directive and 6489 // nominated namespace. 6490 NamespaceDecl *NS = getNamespaceDecl(Named); 6491 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6492 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6493 CommonAncestor = CommonAncestor->getParent(); 6494 6495 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6496 SS.getWithLocInContext(Context), 6497 IdentLoc, Named, CommonAncestor); 6498 6499 if (IsUsingDirectiveInToplevelContext(CurContext) && 6500 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6501 Diag(IdentLoc, diag::warn_using_directive_in_header); 6502 } 6503 6504 PushUsingDirective(S, UDir); 6505 } else { 6506 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6507 } 6508 6509 if (UDir) 6510 ProcessDeclAttributeList(S, UDir, AttrList); 6511 6512 return UDir; 6513 } 6514 6515 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6516 // If the scope has an associated entity and the using directive is at 6517 // namespace or translation unit scope, add the UsingDirectiveDecl into 6518 // its lookup structure so qualified name lookup can find it. 6519 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6520 if (Ctx && !Ctx->isFunctionOrMethod()) 6521 Ctx->addDecl(UDir); 6522 else 6523 // Otherwise, it is at block sope. The using-directives will affect lookup 6524 // only to the end of the scope. 6525 S->PushUsingDirective(UDir); 6526 } 6527 6528 6529 Decl *Sema::ActOnUsingDeclaration(Scope *S, 6530 AccessSpecifier AS, 6531 bool HasUsingKeyword, 6532 SourceLocation UsingLoc, 6533 CXXScopeSpec &SS, 6534 UnqualifiedId &Name, 6535 AttributeList *AttrList, 6536 bool IsTypeName, 6537 SourceLocation TypenameLoc) { 6538 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6539 6540 switch (Name.getKind()) { 6541 case UnqualifiedId::IK_ImplicitSelfParam: 6542 case UnqualifiedId::IK_Identifier: 6543 case UnqualifiedId::IK_OperatorFunctionId: 6544 case UnqualifiedId::IK_LiteralOperatorId: 6545 case UnqualifiedId::IK_ConversionFunctionId: 6546 break; 6547 6548 case UnqualifiedId::IK_ConstructorName: 6549 case UnqualifiedId::IK_ConstructorTemplateId: 6550 // C++11 inheriting constructors. 6551 Diag(Name.getLocStart(), 6552 getLangOpts().CPlusPlus11 ? 6553 diag::warn_cxx98_compat_using_decl_constructor : 6554 diag::err_using_decl_constructor) 6555 << SS.getRange(); 6556 6557 if (getLangOpts().CPlusPlus11) break; 6558 6559 return 0; 6560 6561 case UnqualifiedId::IK_DestructorName: 6562 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6563 << SS.getRange(); 6564 return 0; 6565 6566 case UnqualifiedId::IK_TemplateId: 6567 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6568 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6569 return 0; 6570 } 6571 6572 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6573 DeclarationName TargetName = TargetNameInfo.getName(); 6574 if (!TargetName) 6575 return 0; 6576 6577 // Warn about access declarations. 6578 // TODO: store that the declaration was written without 'using' and 6579 // talk about access decls instead of using decls in the 6580 // diagnostics. 6581 if (!HasUsingKeyword) { 6582 UsingLoc = Name.getLocStart(); 6583 6584 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6585 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6586 } 6587 6588 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6589 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6590 return 0; 6591 6592 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6593 TargetNameInfo, AttrList, 6594 /* IsInstantiation */ false, 6595 IsTypeName, TypenameLoc); 6596 if (UD) 6597 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6598 6599 return UD; 6600 } 6601 6602 /// \brief Determine whether a using declaration considers the given 6603 /// declarations as "equivalent", e.g., if they are redeclarations of 6604 /// the same entity or are both typedefs of the same type. 6605 static bool 6606 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6607 bool &SuppressRedeclaration) { 6608 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6609 SuppressRedeclaration = false; 6610 return true; 6611 } 6612 6613 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6614 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6615 SuppressRedeclaration = true; 6616 return Context.hasSameType(TD1->getUnderlyingType(), 6617 TD2->getUnderlyingType()); 6618 } 6619 6620 return false; 6621 } 6622 6623 6624 /// Determines whether to create a using shadow decl for a particular 6625 /// decl, given the set of decls existing prior to this using lookup. 6626 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6627 const LookupResult &Previous) { 6628 // Diagnose finding a decl which is not from a base class of the 6629 // current class. We do this now because there are cases where this 6630 // function will silently decide not to build a shadow decl, which 6631 // will pre-empt further diagnostics. 6632 // 6633 // We don't need to do this in C++0x because we do the check once on 6634 // the qualifier. 6635 // 6636 // FIXME: diagnose the following if we care enough: 6637 // struct A { int foo; }; 6638 // struct B : A { using A::foo; }; 6639 // template <class T> struct C : A {}; 6640 // template <class T> struct D : C<T> { using B::foo; } // <--- 6641 // This is invalid (during instantiation) in C++03 because B::foo 6642 // resolves to the using decl in B, which is not a base class of D<T>. 6643 // We can't diagnose it immediately because C<T> is an unknown 6644 // specialization. The UsingShadowDecl in D<T> then points directly 6645 // to A::foo, which will look well-formed when we instantiate. 6646 // The right solution is to not collapse the shadow-decl chain. 6647 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6648 DeclContext *OrigDC = Orig->getDeclContext(); 6649 6650 // Handle enums and anonymous structs. 6651 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6652 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6653 while (OrigRec->isAnonymousStructOrUnion()) 6654 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6655 6656 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6657 if (OrigDC == CurContext) { 6658 Diag(Using->getLocation(), 6659 diag::err_using_decl_nested_name_specifier_is_current_class) 6660 << Using->getQualifierLoc().getSourceRange(); 6661 Diag(Orig->getLocation(), diag::note_using_decl_target); 6662 return true; 6663 } 6664 6665 Diag(Using->getQualifierLoc().getBeginLoc(), 6666 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6667 << Using->getQualifier() 6668 << cast<CXXRecordDecl>(CurContext) 6669 << Using->getQualifierLoc().getSourceRange(); 6670 Diag(Orig->getLocation(), diag::note_using_decl_target); 6671 return true; 6672 } 6673 } 6674 6675 if (Previous.empty()) return false; 6676 6677 NamedDecl *Target = Orig; 6678 if (isa<UsingShadowDecl>(Target)) 6679 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6680 6681 // If the target happens to be one of the previous declarations, we 6682 // don't have a conflict. 6683 // 6684 // FIXME: but we might be increasing its access, in which case we 6685 // should redeclare it. 6686 NamedDecl *NonTag = 0, *Tag = 0; 6687 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6688 I != E; ++I) { 6689 NamedDecl *D = (*I)->getUnderlyingDecl(); 6690 bool Result; 6691 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6692 return Result; 6693 6694 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6695 } 6696 6697 if (Target->isFunctionOrFunctionTemplate()) { 6698 FunctionDecl *FD; 6699 if (isa<FunctionTemplateDecl>(Target)) 6700 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6701 else 6702 FD = cast<FunctionDecl>(Target); 6703 6704 NamedDecl *OldDecl = 0; 6705 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6706 case Ovl_Overload: 6707 return false; 6708 6709 case Ovl_NonFunction: 6710 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6711 break; 6712 6713 // We found a decl with the exact signature. 6714 case Ovl_Match: 6715 // If we're in a record, we want to hide the target, so we 6716 // return true (without a diagnostic) to tell the caller not to 6717 // build a shadow decl. 6718 if (CurContext->isRecord()) 6719 return true; 6720 6721 // If we're not in a record, this is an error. 6722 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6723 break; 6724 } 6725 6726 Diag(Target->getLocation(), diag::note_using_decl_target); 6727 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6728 return true; 6729 } 6730 6731 // Target is not a function. 6732 6733 if (isa<TagDecl>(Target)) { 6734 // No conflict between a tag and a non-tag. 6735 if (!Tag) return false; 6736 6737 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6738 Diag(Target->getLocation(), diag::note_using_decl_target); 6739 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6740 return true; 6741 } 6742 6743 // No conflict between a tag and a non-tag. 6744 if (!NonTag) return false; 6745 6746 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6747 Diag(Target->getLocation(), diag::note_using_decl_target); 6748 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6749 return true; 6750 } 6751 6752 /// Builds a shadow declaration corresponding to a 'using' declaration. 6753 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6754 UsingDecl *UD, 6755 NamedDecl *Orig) { 6756 6757 // If we resolved to another shadow declaration, just coalesce them. 6758 NamedDecl *Target = Orig; 6759 if (isa<UsingShadowDecl>(Target)) { 6760 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6761 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6762 } 6763 6764 UsingShadowDecl *Shadow 6765 = UsingShadowDecl::Create(Context, CurContext, 6766 UD->getLocation(), UD, Target); 6767 UD->addShadowDecl(Shadow); 6768 6769 Shadow->setAccess(UD->getAccess()); 6770 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6771 Shadow->setInvalidDecl(); 6772 6773 if (S) 6774 PushOnScopeChains(Shadow, S); 6775 else 6776 CurContext->addDecl(Shadow); 6777 6778 6779 return Shadow; 6780 } 6781 6782 /// Hides a using shadow declaration. This is required by the current 6783 /// using-decl implementation when a resolvable using declaration in a 6784 /// class is followed by a declaration which would hide or override 6785 /// one or more of the using decl's targets; for example: 6786 /// 6787 /// struct Base { void foo(int); }; 6788 /// struct Derived : Base { 6789 /// using Base::foo; 6790 /// void foo(int); 6791 /// }; 6792 /// 6793 /// The governing language is C++03 [namespace.udecl]p12: 6794 /// 6795 /// When a using-declaration brings names from a base class into a 6796 /// derived class scope, member functions in the derived class 6797 /// override and/or hide member functions with the same name and 6798 /// parameter types in a base class (rather than conflicting). 6799 /// 6800 /// There are two ways to implement this: 6801 /// (1) optimistically create shadow decls when they're not hidden 6802 /// by existing declarations, or 6803 /// (2) don't create any shadow decls (or at least don't make them 6804 /// visible) until we've fully parsed/instantiated the class. 6805 /// The problem with (1) is that we might have to retroactively remove 6806 /// a shadow decl, which requires several O(n) operations because the 6807 /// decl structures are (very reasonably) not designed for removal. 6808 /// (2) avoids this but is very fiddly and phase-dependent. 6809 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6810 if (Shadow->getDeclName().getNameKind() == 6811 DeclarationName::CXXConversionFunctionName) 6812 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6813 6814 // Remove it from the DeclContext... 6815 Shadow->getDeclContext()->removeDecl(Shadow); 6816 6817 // ...and the scope, if applicable... 6818 if (S) { 6819 S->RemoveDecl(Shadow); 6820 IdResolver.RemoveDecl(Shadow); 6821 } 6822 6823 // ...and the using decl. 6824 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6825 6826 // TODO: complain somehow if Shadow was used. It shouldn't 6827 // be possible for this to happen, because...? 6828 } 6829 6830 /// Builds a using declaration. 6831 /// 6832 /// \param IsInstantiation - Whether this call arises from an 6833 /// instantiation of an unresolved using declaration. We treat 6834 /// the lookup differently for these declarations. 6835 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6836 SourceLocation UsingLoc, 6837 CXXScopeSpec &SS, 6838 const DeclarationNameInfo &NameInfo, 6839 AttributeList *AttrList, 6840 bool IsInstantiation, 6841 bool IsTypeName, 6842 SourceLocation TypenameLoc) { 6843 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6844 SourceLocation IdentLoc = NameInfo.getLoc(); 6845 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6846 6847 // FIXME: We ignore attributes for now. 6848 6849 if (SS.isEmpty()) { 6850 Diag(IdentLoc, diag::err_using_requires_qualname); 6851 return 0; 6852 } 6853 6854 // Do the redeclaration lookup in the current scope. 6855 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6856 ForRedeclaration); 6857 Previous.setHideTags(false); 6858 if (S) { 6859 LookupName(Previous, S); 6860 6861 // It is really dumb that we have to do this. 6862 LookupResult::Filter F = Previous.makeFilter(); 6863 while (F.hasNext()) { 6864 NamedDecl *D = F.next(); 6865 if (!isDeclInScope(D, CurContext, S)) 6866 F.erase(); 6867 } 6868 F.done(); 6869 } else { 6870 assert(IsInstantiation && "no scope in non-instantiation"); 6871 assert(CurContext->isRecord() && "scope not record in instantiation"); 6872 LookupQualifiedName(Previous, CurContext); 6873 } 6874 6875 // Check for invalid redeclarations. 6876 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6877 return 0; 6878 6879 // Check for bad qualifiers. 6880 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6881 return 0; 6882 6883 DeclContext *LookupContext = computeDeclContext(SS); 6884 NamedDecl *D; 6885 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6886 if (!LookupContext) { 6887 if (IsTypeName) { 6888 // FIXME: not all declaration name kinds are legal here 6889 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6890 UsingLoc, TypenameLoc, 6891 QualifierLoc, 6892 IdentLoc, NameInfo.getName()); 6893 } else { 6894 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6895 QualifierLoc, NameInfo); 6896 } 6897 } else { 6898 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6899 NameInfo, IsTypeName); 6900 } 6901 D->setAccess(AS); 6902 CurContext->addDecl(D); 6903 6904 if (!LookupContext) return D; 6905 UsingDecl *UD = cast<UsingDecl>(D); 6906 6907 if (RequireCompleteDeclContext(SS, LookupContext)) { 6908 UD->setInvalidDecl(); 6909 return UD; 6910 } 6911 6912 // The normal rules do not apply to inheriting constructor declarations. 6913 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6914 if (CheckInheritingConstructorUsingDecl(UD)) 6915 UD->setInvalidDecl(); 6916 return UD; 6917 } 6918 6919 // Otherwise, look up the target name. 6920 6921 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6922 6923 // Unlike most lookups, we don't always want to hide tag 6924 // declarations: tag names are visible through the using declaration 6925 // even if hidden by ordinary names, *except* in a dependent context 6926 // where it's important for the sanity of two-phase lookup. 6927 if (!IsInstantiation) 6928 R.setHideTags(false); 6929 6930 // For the purposes of this lookup, we have a base object type 6931 // equal to that of the current context. 6932 if (CurContext->isRecord()) { 6933 R.setBaseObjectType( 6934 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6935 } 6936 6937 LookupQualifiedName(R, LookupContext); 6938 6939 if (R.empty()) { 6940 Diag(IdentLoc, diag::err_no_member) 6941 << NameInfo.getName() << LookupContext << SS.getRange(); 6942 UD->setInvalidDecl(); 6943 return UD; 6944 } 6945 6946 if (R.isAmbiguous()) { 6947 UD->setInvalidDecl(); 6948 return UD; 6949 } 6950 6951 if (IsTypeName) { 6952 // If we asked for a typename and got a non-type decl, error out. 6953 if (!R.getAsSingle<TypeDecl>()) { 6954 Diag(IdentLoc, diag::err_using_typename_non_type); 6955 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6956 Diag((*I)->getUnderlyingDecl()->getLocation(), 6957 diag::note_using_decl_target); 6958 UD->setInvalidDecl(); 6959 return UD; 6960 } 6961 } else { 6962 // If we asked for a non-typename and we got a type, error out, 6963 // but only if this is an instantiation of an unresolved using 6964 // decl. Otherwise just silently find the type name. 6965 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6966 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6967 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6968 UD->setInvalidDecl(); 6969 return UD; 6970 } 6971 } 6972 6973 // C++0x N2914 [namespace.udecl]p6: 6974 // A using-declaration shall not name a namespace. 6975 if (R.getAsSingle<NamespaceDecl>()) { 6976 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6977 << SS.getRange(); 6978 UD->setInvalidDecl(); 6979 return UD; 6980 } 6981 6982 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6983 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6984 BuildUsingShadowDecl(S, UD, *I); 6985 } 6986 6987 return UD; 6988 } 6989 6990 /// Additional checks for a using declaration referring to a constructor name. 6991 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6992 assert(!UD->isTypeName() && "expecting a constructor name"); 6993 6994 const Type *SourceType = UD->getQualifier()->getAsType(); 6995 assert(SourceType && 6996 "Using decl naming constructor doesn't have type in scope spec."); 6997 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6998 6999 // Check whether the named type is a direct base class. 7000 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7001 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7002 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7003 BaseIt != BaseE; ++BaseIt) { 7004 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7005 if (CanonicalSourceType == BaseType) 7006 break; 7007 if (BaseIt->getType()->isDependentType()) 7008 break; 7009 } 7010 7011 if (BaseIt == BaseE) { 7012 // Did not find SourceType in the bases. 7013 Diag(UD->getUsingLocation(), 7014 diag::err_using_decl_constructor_not_in_direct_base) 7015 << UD->getNameInfo().getSourceRange() 7016 << QualType(SourceType, 0) << TargetClass; 7017 return true; 7018 } 7019 7020 if (!CurContext->isDependentContext()) 7021 BaseIt->setInheritConstructors(); 7022 7023 return false; 7024 } 7025 7026 /// Checks that the given using declaration is not an invalid 7027 /// redeclaration. Note that this is checking only for the using decl 7028 /// itself, not for any ill-formedness among the UsingShadowDecls. 7029 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7030 bool isTypeName, 7031 const CXXScopeSpec &SS, 7032 SourceLocation NameLoc, 7033 const LookupResult &Prev) { 7034 // C++03 [namespace.udecl]p8: 7035 // C++0x [namespace.udecl]p10: 7036 // A using-declaration is a declaration and can therefore be used 7037 // repeatedly where (and only where) multiple declarations are 7038 // allowed. 7039 // 7040 // That's in non-member contexts. 7041 if (!CurContext->getRedeclContext()->isRecord()) 7042 return false; 7043 7044 NestedNameSpecifier *Qual 7045 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7046 7047 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7048 NamedDecl *D = *I; 7049 7050 bool DTypename; 7051 NestedNameSpecifier *DQual; 7052 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7053 DTypename = UD->isTypeName(); 7054 DQual = UD->getQualifier(); 7055 } else if (UnresolvedUsingValueDecl *UD 7056 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7057 DTypename = false; 7058 DQual = UD->getQualifier(); 7059 } else if (UnresolvedUsingTypenameDecl *UD 7060 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7061 DTypename = true; 7062 DQual = UD->getQualifier(); 7063 } else continue; 7064 7065 // using decls differ if one says 'typename' and the other doesn't. 7066 // FIXME: non-dependent using decls? 7067 if (isTypeName != DTypename) continue; 7068 7069 // using decls differ if they name different scopes (but note that 7070 // template instantiation can cause this check to trigger when it 7071 // didn't before instantiation). 7072 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7073 Context.getCanonicalNestedNameSpecifier(DQual)) 7074 continue; 7075 7076 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7077 Diag(D->getLocation(), diag::note_using_decl) << 1; 7078 return true; 7079 } 7080 7081 return false; 7082 } 7083 7084 7085 /// Checks that the given nested-name qualifier used in a using decl 7086 /// in the current context is appropriately related to the current 7087 /// scope. If an error is found, diagnoses it and returns true. 7088 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7089 const CXXScopeSpec &SS, 7090 SourceLocation NameLoc) { 7091 DeclContext *NamedContext = computeDeclContext(SS); 7092 7093 if (!CurContext->isRecord()) { 7094 // C++03 [namespace.udecl]p3: 7095 // C++0x [namespace.udecl]p8: 7096 // A using-declaration for a class member shall be a member-declaration. 7097 7098 // If we weren't able to compute a valid scope, it must be a 7099 // dependent class scope. 7100 if (!NamedContext || NamedContext->isRecord()) { 7101 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7102 << SS.getRange(); 7103 return true; 7104 } 7105 7106 // Otherwise, everything is known to be fine. 7107 return false; 7108 } 7109 7110 // The current scope is a record. 7111 7112 // If the named context is dependent, we can't decide much. 7113 if (!NamedContext) { 7114 // FIXME: in C++0x, we can diagnose if we can prove that the 7115 // nested-name-specifier does not refer to a base class, which is 7116 // still possible in some cases. 7117 7118 // Otherwise we have to conservatively report that things might be 7119 // okay. 7120 return false; 7121 } 7122 7123 if (!NamedContext->isRecord()) { 7124 // Ideally this would point at the last name in the specifier, 7125 // but we don't have that level of source info. 7126 Diag(SS.getRange().getBegin(), 7127 diag::err_using_decl_nested_name_specifier_is_not_class) 7128 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7129 return true; 7130 } 7131 7132 if (!NamedContext->isDependentContext() && 7133 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7134 return true; 7135 7136 if (getLangOpts().CPlusPlus11) { 7137 // C++0x [namespace.udecl]p3: 7138 // In a using-declaration used as a member-declaration, the 7139 // nested-name-specifier shall name a base class of the class 7140 // being defined. 7141 7142 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7143 cast<CXXRecordDecl>(NamedContext))) { 7144 if (CurContext == NamedContext) { 7145 Diag(NameLoc, 7146 diag::err_using_decl_nested_name_specifier_is_current_class) 7147 << SS.getRange(); 7148 return true; 7149 } 7150 7151 Diag(SS.getRange().getBegin(), 7152 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7153 << (NestedNameSpecifier*) SS.getScopeRep() 7154 << cast<CXXRecordDecl>(CurContext) 7155 << SS.getRange(); 7156 return true; 7157 } 7158 7159 return false; 7160 } 7161 7162 // C++03 [namespace.udecl]p4: 7163 // A using-declaration used as a member-declaration shall refer 7164 // to a member of a base class of the class being defined [etc.]. 7165 7166 // Salient point: SS doesn't have to name a base class as long as 7167 // lookup only finds members from base classes. Therefore we can 7168 // diagnose here only if we can prove that that can't happen, 7169 // i.e. if the class hierarchies provably don't intersect. 7170 7171 // TODO: it would be nice if "definitely valid" results were cached 7172 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7173 // need to be repeated. 7174 7175 struct UserData { 7176 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7177 7178 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7179 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7180 Data->Bases.insert(Base); 7181 return true; 7182 } 7183 7184 bool hasDependentBases(const CXXRecordDecl *Class) { 7185 return !Class->forallBases(collect, this); 7186 } 7187 7188 /// Returns true if the base is dependent or is one of the 7189 /// accumulated base classes. 7190 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7191 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7192 return !Data->Bases.count(Base); 7193 } 7194 7195 bool mightShareBases(const CXXRecordDecl *Class) { 7196 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7197 } 7198 }; 7199 7200 UserData Data; 7201 7202 // Returns false if we find a dependent base. 7203 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7204 return false; 7205 7206 // Returns false if the class has a dependent base or if it or one 7207 // of its bases is present in the base set of the current context. 7208 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7209 return false; 7210 7211 Diag(SS.getRange().getBegin(), 7212 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7213 << (NestedNameSpecifier*) SS.getScopeRep() 7214 << cast<CXXRecordDecl>(CurContext) 7215 << SS.getRange(); 7216 7217 return true; 7218 } 7219 7220 Decl *Sema::ActOnAliasDeclaration(Scope *S, 7221 AccessSpecifier AS, 7222 MultiTemplateParamsArg TemplateParamLists, 7223 SourceLocation UsingLoc, 7224 UnqualifiedId &Name, 7225 AttributeList *AttrList, 7226 TypeResult Type) { 7227 // Skip up to the relevant declaration scope. 7228 while (S->getFlags() & Scope::TemplateParamScope) 7229 S = S->getParent(); 7230 assert((S->getFlags() & Scope::DeclScope) && 7231 "got alias-declaration outside of declaration scope"); 7232 7233 if (Type.isInvalid()) 7234 return 0; 7235 7236 bool Invalid = false; 7237 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7238 TypeSourceInfo *TInfo = 0; 7239 GetTypeFromParser(Type.get(), &TInfo); 7240 7241 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7242 return 0; 7243 7244 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7245 UPPC_DeclarationType)) { 7246 Invalid = true; 7247 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7248 TInfo->getTypeLoc().getBeginLoc()); 7249 } 7250 7251 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7252 LookupName(Previous, S); 7253 7254 // Warn about shadowing the name of a template parameter. 7255 if (Previous.isSingleResult() && 7256 Previous.getFoundDecl()->isTemplateParameter()) { 7257 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7258 Previous.clear(); 7259 } 7260 7261 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7262 "name in alias declaration must be an identifier"); 7263 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7264 Name.StartLocation, 7265 Name.Identifier, TInfo); 7266 7267 NewTD->setAccess(AS); 7268 7269 if (Invalid) 7270 NewTD->setInvalidDecl(); 7271 7272 ProcessDeclAttributeList(S, NewTD, AttrList); 7273 7274 CheckTypedefForVariablyModifiedType(S, NewTD); 7275 Invalid |= NewTD->isInvalidDecl(); 7276 7277 bool Redeclaration = false; 7278 7279 NamedDecl *NewND; 7280 if (TemplateParamLists.size()) { 7281 TypeAliasTemplateDecl *OldDecl = 0; 7282 TemplateParameterList *OldTemplateParams = 0; 7283 7284 if (TemplateParamLists.size() != 1) { 7285 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7286 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7287 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7288 } 7289 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7290 7291 // Only consider previous declarations in the same scope. 7292 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7293 /*ExplicitInstantiationOrSpecialization*/false); 7294 if (!Previous.empty()) { 7295 Redeclaration = true; 7296 7297 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7298 if (!OldDecl && !Invalid) { 7299 Diag(UsingLoc, diag::err_redefinition_different_kind) 7300 << Name.Identifier; 7301 7302 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7303 if (OldD->getLocation().isValid()) 7304 Diag(OldD->getLocation(), diag::note_previous_definition); 7305 7306 Invalid = true; 7307 } 7308 7309 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7310 if (TemplateParameterListsAreEqual(TemplateParams, 7311 OldDecl->getTemplateParameters(), 7312 /*Complain=*/true, 7313 TPL_TemplateMatch)) 7314 OldTemplateParams = OldDecl->getTemplateParameters(); 7315 else 7316 Invalid = true; 7317 7318 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7319 if (!Invalid && 7320 !Context.hasSameType(OldTD->getUnderlyingType(), 7321 NewTD->getUnderlyingType())) { 7322 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7323 // but we can't reasonably accept it. 7324 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7325 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7326 if (OldTD->getLocation().isValid()) 7327 Diag(OldTD->getLocation(), diag::note_previous_definition); 7328 Invalid = true; 7329 } 7330 } 7331 } 7332 7333 // Merge any previous default template arguments into our parameters, 7334 // and check the parameter list. 7335 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7336 TPC_TypeAliasTemplate)) 7337 return 0; 7338 7339 TypeAliasTemplateDecl *NewDecl = 7340 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7341 Name.Identifier, TemplateParams, 7342 NewTD); 7343 7344 NewDecl->setAccess(AS); 7345 7346 if (Invalid) 7347 NewDecl->setInvalidDecl(); 7348 else if (OldDecl) 7349 NewDecl->setPreviousDeclaration(OldDecl); 7350 7351 NewND = NewDecl; 7352 } else { 7353 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7354 NewND = NewTD; 7355 } 7356 7357 if (!Redeclaration) 7358 PushOnScopeChains(NewND, S); 7359 7360 ActOnDocumentableDecl(NewND); 7361 return NewND; 7362 } 7363 7364 Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7365 SourceLocation NamespaceLoc, 7366 SourceLocation AliasLoc, 7367 IdentifierInfo *Alias, 7368 CXXScopeSpec &SS, 7369 SourceLocation IdentLoc, 7370 IdentifierInfo *Ident) { 7371 7372 // Lookup the namespace name. 7373 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7374 LookupParsedName(R, S, &SS); 7375 7376 // Check if we have a previous declaration with the same name. 7377 NamedDecl *PrevDecl 7378 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7379 ForRedeclaration); 7380 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7381 PrevDecl = 0; 7382 7383 if (PrevDecl) { 7384 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7385 // We already have an alias with the same name that points to the same 7386 // namespace, so don't create a new one. 7387 // FIXME: At some point, we'll want to create the (redundant) 7388 // declaration to maintain better source information. 7389 if (!R.isAmbiguous() && !R.empty() && 7390 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7391 return 0; 7392 } 7393 7394 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7395 diag::err_redefinition_different_kind; 7396 Diag(AliasLoc, DiagID) << Alias; 7397 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7398 return 0; 7399 } 7400 7401 if (R.isAmbiguous()) 7402 return 0; 7403 7404 if (R.empty()) { 7405 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7406 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7407 return 0; 7408 } 7409 } 7410 7411 NamespaceAliasDecl *AliasDecl = 7412 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7413 Alias, SS.getWithLocInContext(Context), 7414 IdentLoc, R.getFoundDecl()); 7415 7416 PushOnScopeChains(AliasDecl, S); 7417 return AliasDecl; 7418 } 7419 7420 Sema::ImplicitExceptionSpecification 7421 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7422 CXXMethodDecl *MD) { 7423 CXXRecordDecl *ClassDecl = MD->getParent(); 7424 7425 // C++ [except.spec]p14: 7426 // An implicitly declared special member function (Clause 12) shall have an 7427 // exception-specification. [...] 7428 ImplicitExceptionSpecification ExceptSpec(*this); 7429 if (ClassDecl->isInvalidDecl()) 7430 return ExceptSpec; 7431 7432 // Direct base-class constructors. 7433 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7434 BEnd = ClassDecl->bases_end(); 7435 B != BEnd; ++B) { 7436 if (B->isVirtual()) // Handled below. 7437 continue; 7438 7439 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7440 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7441 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7442 // If this is a deleted function, add it anyway. This might be conformant 7443 // with the standard. This might not. I'm not sure. It might not matter. 7444 if (Constructor) 7445 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7446 } 7447 } 7448 7449 // Virtual base-class constructors. 7450 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7451 BEnd = ClassDecl->vbases_end(); 7452 B != BEnd; ++B) { 7453 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7454 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7455 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7456 // If this is a deleted function, add it anyway. This might be conformant 7457 // with the standard. This might not. I'm not sure. It might not matter. 7458 if (Constructor) 7459 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7460 } 7461 } 7462 7463 // Field constructors. 7464 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7465 FEnd = ClassDecl->field_end(); 7466 F != FEnd; ++F) { 7467 if (F->hasInClassInitializer()) { 7468 if (Expr *E = F->getInClassInitializer()) 7469 ExceptSpec.CalledExpr(E); 7470 else if (!F->isInvalidDecl()) 7471 // DR1351: 7472 // If the brace-or-equal-initializer of a non-static data member 7473 // invokes a defaulted default constructor of its class or of an 7474 // enclosing class in a potentially evaluated subexpression, the 7475 // program is ill-formed. 7476 // 7477 // This resolution is unworkable: the exception specification of the 7478 // default constructor can be needed in an unevaluated context, in 7479 // particular, in the operand of a noexcept-expression, and we can be 7480 // unable to compute an exception specification for an enclosed class. 7481 // 7482 // We do not allow an in-class initializer to require the evaluation 7483 // of the exception specification for any in-class initializer whose 7484 // definition is not lexically complete. 7485 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7486 } else if (const RecordType *RecordTy 7487 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7488 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7489 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7490 // If this is a deleted function, add it anyway. This might be conformant 7491 // with the standard. This might not. I'm not sure. It might not matter. 7492 // In particular, the problem is that this function never gets called. It 7493 // might just be ill-formed because this function attempts to refer to 7494 // a deleted function here. 7495 if (Constructor) 7496 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7497 } 7498 } 7499 7500 return ExceptSpec; 7501 } 7502 7503 Sema::ImplicitExceptionSpecification 7504 Sema::ComputeInheritingCtorExceptionSpec(CXXMethodDecl *MD) { 7505 ImplicitExceptionSpecification ExceptSpec(*this); 7506 // FIXME: Compute the exception spec. 7507 return ExceptSpec; 7508 } 7509 7510 namespace { 7511 /// RAII object to register a special member as being currently declared. 7512 struct DeclaringSpecialMember { 7513 Sema &S; 7514 Sema::SpecialMemberDecl D; 7515 bool WasAlreadyBeingDeclared; 7516 7517 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7518 : S(S), D(RD, CSM) { 7519 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7520 if (WasAlreadyBeingDeclared) 7521 // This almost never happens, but if it does, ensure that our cache 7522 // doesn't contain a stale result. 7523 S.SpecialMemberCache.clear(); 7524 7525 // FIXME: Register a note to be produced if we encounter an error while 7526 // declaring the special member. 7527 } 7528 ~DeclaringSpecialMember() { 7529 if (!WasAlreadyBeingDeclared) 7530 S.SpecialMembersBeingDeclared.erase(D); 7531 } 7532 7533 /// \brief Are we already trying to declare this special member? 7534 bool isAlreadyBeingDeclared() const { 7535 return WasAlreadyBeingDeclared; 7536 } 7537 }; 7538 } 7539 7540 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7541 CXXRecordDecl *ClassDecl) { 7542 // C++ [class.ctor]p5: 7543 // A default constructor for a class X is a constructor of class X 7544 // that can be called without an argument. If there is no 7545 // user-declared constructor for class X, a default constructor is 7546 // implicitly declared. An implicitly-declared default constructor 7547 // is an inline public member of its class. 7548 assert(ClassDecl->needsImplicitDefaultConstructor() && 7549 "Should not build implicit default constructor!"); 7550 7551 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7552 if (DSM.isAlreadyBeingDeclared()) 7553 return 0; 7554 7555 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7556 CXXDefaultConstructor, 7557 false); 7558 7559 // Create the actual constructor declaration. 7560 CanQualType ClassType 7561 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7562 SourceLocation ClassLoc = ClassDecl->getLocation(); 7563 DeclarationName Name 7564 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7565 DeclarationNameInfo NameInfo(Name, ClassLoc); 7566 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7567 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7568 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7569 Constexpr); 7570 DefaultCon->setAccess(AS_public); 7571 DefaultCon->setDefaulted(); 7572 DefaultCon->setImplicit(); 7573 7574 // Build an exception specification pointing back at this constructor. 7575 FunctionProtoType::ExtProtoInfo EPI; 7576 EPI.ExceptionSpecType = EST_Unevaluated; 7577 EPI.ExceptionSpecDecl = DefaultCon; 7578 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 7579 ArrayRef<QualType>(), 7580 EPI)); 7581 7582 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7583 // constructors is easy to compute. 7584 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7585 7586 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7587 DefaultCon->setDeletedAsWritten(); 7588 7589 // Note that we have declared this constructor. 7590 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7591 7592 if (Scope *S = getScopeForContext(ClassDecl)) 7593 PushOnScopeChains(DefaultCon, S, false); 7594 ClassDecl->addDecl(DefaultCon); 7595 7596 return DefaultCon; 7597 } 7598 7599 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7600 CXXConstructorDecl *Constructor) { 7601 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7602 !Constructor->doesThisDeclarationHaveABody() && 7603 !Constructor->isDeleted()) && 7604 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7605 7606 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7607 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7608 7609 SynthesizedFunctionScope Scope(*this, Constructor); 7610 DiagnosticErrorTrap Trap(Diags); 7611 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7612 Trap.hasErrorOccurred()) { 7613 Diag(CurrentLocation, diag::note_member_synthesized_at) 7614 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7615 Constructor->setInvalidDecl(); 7616 return; 7617 } 7618 7619 SourceLocation Loc = Constructor->getLocation(); 7620 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7621 7622 Constructor->setUsed(); 7623 MarkVTableUsed(CurrentLocation, ClassDecl); 7624 7625 if (ASTMutationListener *L = getASTMutationListener()) { 7626 L->CompletedImplicitDefinition(Constructor); 7627 } 7628 } 7629 7630 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7631 // Check that any explicitly-defaulted methods have exception specifications 7632 // compatible with their implicit exception specifications. 7633 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7634 } 7635 7636 void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 7637 // We start with an initial pass over the base classes to collect those that 7638 // inherit constructors from. If there are none, we can forgo all further 7639 // processing. 7640 typedef SmallVector<const RecordType *, 4> BasesVector; 7641 BasesVector BasesToInheritFrom; 7642 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7643 BaseE = ClassDecl->bases_end(); 7644 BaseIt != BaseE; ++BaseIt) { 7645 if (BaseIt->getInheritConstructors()) { 7646 QualType Base = BaseIt->getType(); 7647 if (Base->isDependentType()) { 7648 // If we inherit constructors from anything that is dependent, just 7649 // abort processing altogether. We'll get another chance for the 7650 // instantiations. 7651 // FIXME: We need to ensure that any call to a constructor of this class 7652 // is considered instantiation-dependent in this case. 7653 return; 7654 } 7655 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7656 } 7657 } 7658 if (BasesToInheritFrom.empty()) 7659 return; 7660 7661 // FIXME: Constructor templates. 7662 7663 // Now collect the constructors that we already have in the current class. 7664 // Those take precedence over inherited constructors. 7665 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7666 // unless there is a user-declared constructor with the same signature in 7667 // the class where the using-declaration appears. 7668 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7669 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7670 CtorE = ClassDecl->ctor_end(); 7671 CtorIt != CtorE; ++CtorIt) 7672 ExistingConstructors.insert( 7673 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7674 7675 DeclarationName CreatedCtorName = 7676 Context.DeclarationNames.getCXXConstructorName( 7677 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7678 7679 // Now comes the true work. 7680 // First, we keep a map from constructor types to the base that introduced 7681 // them. Needed for finding conflicting constructors. We also keep the 7682 // actually inserted declarations in there, for pretty diagnostics. 7683 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7684 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7685 ConstructorToSourceMap InheritedConstructors; 7686 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7687 BaseE = BasesToInheritFrom.end(); 7688 BaseIt != BaseE; ++BaseIt) { 7689 const RecordType *Base = *BaseIt; 7690 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7691 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7692 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7693 CtorE = BaseDecl->ctor_end(); 7694 CtorIt != CtorE; ++CtorIt) { 7695 // Find the using declaration for inheriting this base's constructors. 7696 // FIXME: Don't perform name lookup just to obtain a source location! 7697 DeclarationName Name = 7698 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7699 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7700 LookupQualifiedName(Result, CurContext); 7701 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7702 SourceLocation UsingLoc = UD ? UD->getLocation() : 7703 ClassDecl->getLocation(); 7704 7705 // C++11 [class.inhctor]p1: 7706 // The candidate set of inherited constructors from the class X named in 7707 // the using-declaration consists of actual constructors and notional 7708 // constructors that result from the transformation of defaulted 7709 // parameters as follows: 7710 // - all non-template constructors of X, and 7711 // - for each non-template constructor of X that has at least one 7712 // parameter with a default argument, the set of constructors that 7713 // results from omitting any ellipsis parameter specification and 7714 // successively omitting parameters with a default argument from the 7715 // end of the parameter-type-list, and 7716 // FIXME: ...also constructor templates. 7717 CXXConstructorDecl *BaseCtor = *CtorIt; 7718 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7719 const FunctionProtoType *BaseCtorType = 7720 BaseCtor->getType()->getAs<FunctionProtoType>(); 7721 7722 // Determine whether this would be a copy or move constructor for the 7723 // derived class. 7724 if (BaseCtorType->getNumArgs() >= 1 && 7725 BaseCtorType->getArgType(0)->isReferenceType() && 7726 Context.hasSameUnqualifiedType( 7727 BaseCtorType->getArgType(0)->getPointeeType(), 7728 Context.getTagDeclType(ClassDecl))) 7729 CanBeCopyOrMove = true; 7730 7731 ArrayRef<QualType> ArgTypes(BaseCtorType->getArgTypes()); 7732 FunctionProtoType::ExtProtoInfo EPI = BaseCtorType->getExtProtoInfo(); 7733 // Core issue (no number yet): the ellipsis is always discarded. 7734 if (EPI.Variadic) { 7735 Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 7736 Diag(BaseCtor->getLocation(), 7737 diag::note_using_decl_constructor_ellipsis); 7738 EPI.Variadic = false; 7739 } 7740 7741 for (unsigned Params = BaseCtor->getMinRequiredArguments(), 7742 MaxParams = BaseCtor->getNumParams(); 7743 Params <= MaxParams; ++Params) { 7744 // Skip default constructors. They're never inherited. 7745 if (Params == 0) 7746 continue; 7747 7748 // Skip copy and move constructors for both base and derived class 7749 // for the same reason. 7750 if (CanBeCopyOrMove && Params == 1) 7751 continue; 7752 7753 // Build up a function type for this particular constructor. 7754 QualType NewCtorType = 7755 Context.getFunctionType(Context.VoidTy, ArgTypes.slice(0, Params), 7756 EPI); 7757 const Type *CanonicalNewCtorType = 7758 Context.getCanonicalType(NewCtorType).getTypePtr(); 7759 7760 // C++11 [class.inhctor]p3: 7761 // ... a constructor is implicitly declared with the same constructor 7762 // characteristics unless there is a user-declared constructor with 7763 // the same signature in the class where the using-declaration appears 7764 if (ExistingConstructors.count(CanonicalNewCtorType)) 7765 continue; 7766 7767 // C++11 [class.inhctor]p7: 7768 // If two using-declarations declare inheriting constructors with the 7769 // same signature, the program is ill-formed 7770 std::pair<ConstructorToSourceMap::iterator, bool> result = 7771 InheritedConstructors.insert(std::make_pair( 7772 CanonicalNewCtorType, 7773 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7774 if (!result.second) { 7775 // Already in the map. If it came from a different class, that's an 7776 // error. Not if it's from the same. 7777 CanQualType PreviousBase = result.first->second.first; 7778 if (CanonicalBase != PreviousBase) { 7779 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7780 const CXXConstructorDecl *PrevBaseCtor = 7781 PrevCtor->getInheritedConstructor(); 7782 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7783 7784 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7785 Diag(BaseCtor->getLocation(), 7786 diag::note_using_decl_constructor_conflict_current_ctor); 7787 Diag(PrevBaseCtor->getLocation(), 7788 diag::note_using_decl_constructor_conflict_previous_ctor); 7789 Diag(PrevCtor->getLocation(), 7790 diag::note_using_decl_constructor_conflict_previous_using); 7791 } else { 7792 // Core issue (no number): if the same inheriting constructor is 7793 // produced by multiple base class constructors from the same base 7794 // class, the inheriting constructor is defined as deleted. 7795 result.first->second.second->setDeletedAsWritten(); 7796 } 7797 continue; 7798 } 7799 7800 // OK, we're there, now add the constructor. 7801 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7802 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7803 Context, ClassDecl, UsingLoc, DNI, NewCtorType, 7804 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7805 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 7806 NewCtor->setAccess(BaseCtor->getAccess()); 7807 7808 // Build an unevaluated exception specification for this constructor. 7809 EPI.ExceptionSpecType = EST_Unevaluated; 7810 EPI.ExceptionSpecDecl = NewCtor; 7811 NewCtor->setType(Context.getFunctionType(Context.VoidTy, 7812 ArgTypes.slice(0, Params), 7813 EPI)); 7814 7815 // Build up the parameter decls and add them. 7816 SmallVector<ParmVarDecl *, 16> ParamDecls; 7817 for (unsigned i = 0; i < Params; ++i) { 7818 ParmVarDecl *PD = ParmVarDecl::Create(Context, NewCtor, 7819 UsingLoc, UsingLoc, 7820 /*IdentifierInfo=*/0, 7821 BaseCtorType->getArgType(i), 7822 /*TInfo=*/0, SC_None, 7823 SC_None, /*DefaultArg=*/0); 7824 PD->setScopeInfo(0, i); 7825 PD->setImplicit(); 7826 ParamDecls.push_back(PD); 7827 } 7828 NewCtor->setParams(ParamDecls); 7829 NewCtor->setInheritedConstructor(BaseCtor); 7830 if (BaseCtor->isDeleted()) 7831 NewCtor->setDeletedAsWritten(); 7832 7833 ClassDecl->addDecl(NewCtor); 7834 result.first->second.second = NewCtor; 7835 } 7836 } 7837 } 7838 } 7839 7840 void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 7841 CXXConstructorDecl *Constructor) { 7842 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7843 assert(Constructor->getInheritedConstructor() && 7844 !Constructor->doesThisDeclarationHaveABody() && 7845 !Constructor->isDeleted()); 7846 7847 SynthesizedFunctionScope Scope(*this, Constructor); 7848 DiagnosticErrorTrap Trap(Diags); 7849 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7850 Trap.hasErrorOccurred()) { 7851 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 7852 << Context.getTagDeclType(ClassDecl); 7853 Constructor->setInvalidDecl(); 7854 return; 7855 } 7856 7857 SourceLocation Loc = Constructor->getLocation(); 7858 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7859 7860 Constructor->setUsed(); 7861 MarkVTableUsed(CurrentLocation, ClassDecl); 7862 7863 if (ASTMutationListener *L = getASTMutationListener()) { 7864 L->CompletedImplicitDefinition(Constructor); 7865 } 7866 } 7867 7868 7869 Sema::ImplicitExceptionSpecification 7870 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7871 CXXRecordDecl *ClassDecl = MD->getParent(); 7872 7873 // C++ [except.spec]p14: 7874 // An implicitly declared special member function (Clause 12) shall have 7875 // an exception-specification. 7876 ImplicitExceptionSpecification ExceptSpec(*this); 7877 if (ClassDecl->isInvalidDecl()) 7878 return ExceptSpec; 7879 7880 // Direct base-class destructors. 7881 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7882 BEnd = ClassDecl->bases_end(); 7883 B != BEnd; ++B) { 7884 if (B->isVirtual()) // Handled below. 7885 continue; 7886 7887 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7888 ExceptSpec.CalledDecl(B->getLocStart(), 7889 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7890 } 7891 7892 // Virtual base-class destructors. 7893 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7894 BEnd = ClassDecl->vbases_end(); 7895 B != BEnd; ++B) { 7896 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7897 ExceptSpec.CalledDecl(B->getLocStart(), 7898 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7899 } 7900 7901 // Field destructors. 7902 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7903 FEnd = ClassDecl->field_end(); 7904 F != FEnd; ++F) { 7905 if (const RecordType *RecordTy 7906 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7907 ExceptSpec.CalledDecl(F->getLocation(), 7908 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7909 } 7910 7911 return ExceptSpec; 7912 } 7913 7914 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7915 // C++ [class.dtor]p2: 7916 // If a class has no user-declared destructor, a destructor is 7917 // declared implicitly. An implicitly-declared destructor is an 7918 // inline public member of its class. 7919 assert(ClassDecl->needsImplicitDestructor()); 7920 7921 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 7922 if (DSM.isAlreadyBeingDeclared()) 7923 return 0; 7924 7925 // Create the actual destructor declaration. 7926 CanQualType ClassType 7927 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7928 SourceLocation ClassLoc = ClassDecl->getLocation(); 7929 DeclarationName Name 7930 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7931 DeclarationNameInfo NameInfo(Name, ClassLoc); 7932 CXXDestructorDecl *Destructor 7933 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7934 QualType(), 0, /*isInline=*/true, 7935 /*isImplicitlyDeclared=*/true); 7936 Destructor->setAccess(AS_public); 7937 Destructor->setDefaulted(); 7938 Destructor->setImplicit(); 7939 7940 // Build an exception specification pointing back at this destructor. 7941 FunctionProtoType::ExtProtoInfo EPI; 7942 EPI.ExceptionSpecType = EST_Unevaluated; 7943 EPI.ExceptionSpecDecl = Destructor; 7944 Destructor->setType(Context.getFunctionType(Context.VoidTy, 7945 ArrayRef<QualType>(), 7946 EPI)); 7947 7948 AddOverriddenMethods(ClassDecl, Destructor); 7949 7950 // We don't need to use SpecialMemberIsTrivial here; triviality for 7951 // destructors is easy to compute. 7952 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7953 7954 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7955 Destructor->setDeletedAsWritten(); 7956 7957 // Note that we have declared this destructor. 7958 ++ASTContext::NumImplicitDestructorsDeclared; 7959 7960 // Introduce this destructor into its scope. 7961 if (Scope *S = getScopeForContext(ClassDecl)) 7962 PushOnScopeChains(Destructor, S, false); 7963 ClassDecl->addDecl(Destructor); 7964 7965 return Destructor; 7966 } 7967 7968 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7969 CXXDestructorDecl *Destructor) { 7970 assert((Destructor->isDefaulted() && 7971 !Destructor->doesThisDeclarationHaveABody() && 7972 !Destructor->isDeleted()) && 7973 "DefineImplicitDestructor - call it for implicit default dtor"); 7974 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7975 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7976 7977 if (Destructor->isInvalidDecl()) 7978 return; 7979 7980 SynthesizedFunctionScope Scope(*this, Destructor); 7981 7982 DiagnosticErrorTrap Trap(Diags); 7983 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7984 Destructor->getParent()); 7985 7986 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7987 Diag(CurrentLocation, diag::note_member_synthesized_at) 7988 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7989 7990 Destructor->setInvalidDecl(); 7991 return; 7992 } 7993 7994 SourceLocation Loc = Destructor->getLocation(); 7995 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7996 Destructor->setImplicitlyDefined(true); 7997 Destructor->setUsed(); 7998 MarkVTableUsed(CurrentLocation, ClassDecl); 7999 8000 if (ASTMutationListener *L = getASTMutationListener()) { 8001 L->CompletedImplicitDefinition(Destructor); 8002 } 8003 } 8004 8005 /// \brief Perform any semantic analysis which needs to be delayed until all 8006 /// pending class member declarations have been parsed. 8007 void Sema::ActOnFinishCXXMemberDecls() { 8008 // If the context is an invalid C++ class, just suppress these checks. 8009 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8010 if (Record->isInvalidDecl()) { 8011 DelayedDestructorExceptionSpecChecks.clear(); 8012 return; 8013 } 8014 } 8015 8016 // Perform any deferred checking of exception specifications for virtual 8017 // destructors. 8018 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8019 i != e; ++i) { 8020 const CXXDestructorDecl *Dtor = 8021 DelayedDestructorExceptionSpecChecks[i].first; 8022 assert(!Dtor->getParent()->isDependentType() && 8023 "Should not ever add destructors of templates into the list."); 8024 CheckOverridingFunctionExceptionSpec(Dtor, 8025 DelayedDestructorExceptionSpecChecks[i].second); 8026 } 8027 DelayedDestructorExceptionSpecChecks.clear(); 8028 } 8029 8030 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8031 CXXDestructorDecl *Destructor) { 8032 assert(getLangOpts().CPlusPlus11 && 8033 "adjusting dtor exception specs was introduced in c++11"); 8034 8035 // C++11 [class.dtor]p3: 8036 // A declaration of a destructor that does not have an exception- 8037 // specification is implicitly considered to have the same exception- 8038 // specification as an implicit declaration. 8039 const FunctionProtoType *DtorType = Destructor->getType()-> 8040 getAs<FunctionProtoType>(); 8041 if (DtorType->hasExceptionSpec()) 8042 return; 8043 8044 // Replace the destructor's type, building off the existing one. Fortunately, 8045 // the only thing of interest in the destructor type is its extended info. 8046 // The return and arguments are fixed. 8047 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8048 EPI.ExceptionSpecType = EST_Unevaluated; 8049 EPI.ExceptionSpecDecl = Destructor; 8050 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8051 ArrayRef<QualType>(), 8052 EPI)); 8053 8054 // FIXME: If the destructor has a body that could throw, and the newly created 8055 // spec doesn't allow exceptions, we should emit a warning, because this 8056 // change in behavior can break conforming C++03 programs at runtime. 8057 // However, we don't have a body or an exception specification yet, so it 8058 // needs to be done somewhere else. 8059 } 8060 8061 /// When generating a defaulted copy or move assignment operator, if a field 8062 /// should be copied with __builtin_memcpy rather than via explicit assignments, 8063 /// do so. This optimization only applies for arrays of scalars, and for arrays 8064 /// of class type where the selected copy/move-assignment operator is trivial. 8065 static StmtResult 8066 buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8067 Expr *To, Expr *From) { 8068 // Compute the size of the memory buffer to be copied. 8069 QualType SizeType = S.Context.getSizeType(); 8070 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8071 S.Context.getTypeSizeInChars(T).getQuantity()); 8072 8073 // Take the address of the field references for "from" and "to". We 8074 // directly construct UnaryOperators here because semantic analysis 8075 // does not permit us to take the address of an xvalue. 8076 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8077 S.Context.getPointerType(From->getType()), 8078 VK_RValue, OK_Ordinary, Loc); 8079 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8080 S.Context.getPointerType(To->getType()), 8081 VK_RValue, OK_Ordinary, Loc); 8082 8083 const Type *E = T->getBaseElementTypeUnsafe(); 8084 bool NeedsCollectableMemCpy = 8085 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8086 8087 // Create a reference to the __builtin_objc_memmove_collectable function 8088 StringRef MemCpyName = NeedsCollectableMemCpy ? 8089 "__builtin_objc_memmove_collectable" : 8090 "__builtin_memcpy"; 8091 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8092 Sema::LookupOrdinaryName); 8093 S.LookupName(R, S.TUScope, true); 8094 8095 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8096 if (!MemCpy) 8097 // Something went horribly wrong earlier, and we will have complained 8098 // about it. 8099 return StmtError(); 8100 8101 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8102 VK_RValue, Loc, 0); 8103 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8104 8105 Expr *CallArgs[] = { 8106 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8107 }; 8108 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8109 Loc, CallArgs, Loc); 8110 8111 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8112 return S.Owned(Call.takeAs<Stmt>()); 8113 } 8114 8115 /// \brief Builds a statement that copies/moves the given entity from \p From to 8116 /// \c To. 8117 /// 8118 /// This routine is used to copy/move the members of a class with an 8119 /// implicitly-declared copy/move assignment operator. When the entities being 8120 /// copied are arrays, this routine builds for loops to copy them. 8121 /// 8122 /// \param S The Sema object used for type-checking. 8123 /// 8124 /// \param Loc The location where the implicit copy/move is being generated. 8125 /// 8126 /// \param T The type of the expressions being copied/moved. Both expressions 8127 /// must have this type. 8128 /// 8129 /// \param To The expression we are copying/moving to. 8130 /// 8131 /// \param From The expression we are copying/moving from. 8132 /// 8133 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8134 /// Otherwise, it's a non-static member subobject. 8135 /// 8136 /// \param Copying Whether we're copying or moving. 8137 /// 8138 /// \param Depth Internal parameter recording the depth of the recursion. 8139 /// 8140 /// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8141 /// if a memcpy should be used instead. 8142 static StmtResult 8143 buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8144 Expr *To, Expr *From, 8145 bool CopyingBaseSubobject, bool Copying, 8146 unsigned Depth = 0) { 8147 // C++11 [class.copy]p28: 8148 // Each subobject is assigned in the manner appropriate to its type: 8149 // 8150 // - if the subobject is of class type, as if by a call to operator= with 8151 // the subobject as the object expression and the corresponding 8152 // subobject of x as a single function argument (as if by explicit 8153 // qualification; that is, ignoring any possible virtual overriding 8154 // functions in more derived classes); 8155 // 8156 // C++03 [class.copy]p13: 8157 // - if the subobject is of class type, the copy assignment operator for 8158 // the class is used (as if by explicit qualification; that is, 8159 // ignoring any possible virtual overriding functions in more derived 8160 // classes); 8161 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8162 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8163 8164 // Look for operator=. 8165 DeclarationName Name 8166 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8167 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8168 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8169 8170 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8171 // operator. 8172 if (!S.getLangOpts().CPlusPlus11) { 8173 LookupResult::Filter F = OpLookup.makeFilter(); 8174 while (F.hasNext()) { 8175 NamedDecl *D = F.next(); 8176 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8177 if (Method->isCopyAssignmentOperator() || 8178 (!Copying && Method->isMoveAssignmentOperator())) 8179 continue; 8180 8181 F.erase(); 8182 } 8183 F.done(); 8184 } 8185 8186 // Suppress the protected check (C++ [class.protected]) for each of the 8187 // assignment operators we found. This strange dance is required when 8188 // we're assigning via a base classes's copy-assignment operator. To 8189 // ensure that we're getting the right base class subobject (without 8190 // ambiguities), we need to cast "this" to that subobject type; to 8191 // ensure that we don't go through the virtual call mechanism, we need 8192 // to qualify the operator= name with the base class (see below). However, 8193 // this means that if the base class has a protected copy assignment 8194 // operator, the protected member access check will fail. So, we 8195 // rewrite "protected" access to "public" access in this case, since we 8196 // know by construction that we're calling from a derived class. 8197 if (CopyingBaseSubobject) { 8198 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8199 L != LEnd; ++L) { 8200 if (L.getAccess() == AS_protected) 8201 L.setAccess(AS_public); 8202 } 8203 } 8204 8205 // Create the nested-name-specifier that will be used to qualify the 8206 // reference to operator=; this is required to suppress the virtual 8207 // call mechanism. 8208 CXXScopeSpec SS; 8209 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8210 SS.MakeTrivial(S.Context, 8211 NestedNameSpecifier::Create(S.Context, 0, false, 8212 CanonicalT), 8213 Loc); 8214 8215 // Create the reference to operator=. 8216 ExprResult OpEqualRef 8217 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8218 /*TemplateKWLoc=*/SourceLocation(), 8219 /*FirstQualifierInScope=*/0, 8220 OpLookup, 8221 /*TemplateArgs=*/0, 8222 /*SuppressQualifierCheck=*/true); 8223 if (OpEqualRef.isInvalid()) 8224 return StmtError(); 8225 8226 // Build the call to the assignment operator. 8227 8228 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8229 OpEqualRef.takeAs<Expr>(), 8230 Loc, &From, 1, Loc); 8231 if (Call.isInvalid()) 8232 return StmtError(); 8233 8234 // If we built a call to a trivial 'operator=' while copying an array, 8235 // bail out. We'll replace the whole shebang with a memcpy. 8236 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8237 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8238 return StmtResult((Stmt*)0); 8239 8240 // Convert to an expression-statement, and clean up any produced 8241 // temporaries. 8242 return S.ActOnExprStmt(Call); 8243 } 8244 8245 // - if the subobject is of scalar type, the built-in assignment 8246 // operator is used. 8247 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8248 if (!ArrayTy) { 8249 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8250 if (Assignment.isInvalid()) 8251 return StmtError(); 8252 return S.ActOnExprStmt(Assignment); 8253 } 8254 8255 // - if the subobject is an array, each element is assigned, in the 8256 // manner appropriate to the element type; 8257 8258 // Construct a loop over the array bounds, e.g., 8259 // 8260 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8261 // 8262 // that will copy each of the array elements. 8263 QualType SizeType = S.Context.getSizeType(); 8264 8265 // Create the iteration variable. 8266 IdentifierInfo *IterationVarName = 0; 8267 { 8268 SmallString<8> Str; 8269 llvm::raw_svector_ostream OS(Str); 8270 OS << "__i" << Depth; 8271 IterationVarName = &S.Context.Idents.get(OS.str()); 8272 } 8273 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8274 IterationVarName, SizeType, 8275 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8276 SC_None, SC_None); 8277 8278 // Initialize the iteration variable to zero. 8279 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8280 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8281 8282 // Create a reference to the iteration variable; we'll use this several 8283 // times throughout. 8284 Expr *IterationVarRef 8285 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8286 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8287 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8288 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8289 8290 // Create the DeclStmt that holds the iteration variable. 8291 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8292 8293 // Subscript the "from" and "to" expressions with the iteration variable. 8294 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8295 IterationVarRefRVal, 8296 Loc)); 8297 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8298 IterationVarRefRVal, 8299 Loc)); 8300 if (!Copying) // Cast to rvalue 8301 From = CastForMoving(S, From); 8302 8303 // Build the copy/move for an individual element of the array. 8304 StmtResult Copy = 8305 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8306 To, From, CopyingBaseSubobject, 8307 Copying, Depth + 1); 8308 // Bail out if copying fails or if we determined that we should use memcpy. 8309 if (Copy.isInvalid() || !Copy.get()) 8310 return Copy; 8311 8312 // Create the comparison against the array bound. 8313 llvm::APInt Upper 8314 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8315 Expr *Comparison 8316 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8317 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8318 BO_NE, S.Context.BoolTy, 8319 VK_RValue, OK_Ordinary, Loc, false); 8320 8321 // Create the pre-increment of the iteration variable. 8322 Expr *Increment 8323 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8324 VK_LValue, OK_Ordinary, Loc); 8325 8326 // Construct the loop that copies all elements of this array. 8327 return S.ActOnForStmt(Loc, Loc, InitStmt, 8328 S.MakeFullExpr(Comparison), 8329 0, S.MakeFullDiscardedValueExpr(Increment), 8330 Loc, Copy.take()); 8331 } 8332 8333 static StmtResult 8334 buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8335 Expr *To, Expr *From, 8336 bool CopyingBaseSubobject, bool Copying) { 8337 // Maybe we should use a memcpy? 8338 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8339 T.isTriviallyCopyableType(S.Context)) 8340 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8341 8342 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8343 CopyingBaseSubobject, 8344 Copying, 0)); 8345 8346 // If we ended up picking a trivial assignment operator for an array of a 8347 // non-trivially-copyable class type, just emit a memcpy. 8348 if (!Result.isInvalid() && !Result.get()) 8349 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8350 8351 return Result; 8352 } 8353 8354 Sema::ImplicitExceptionSpecification 8355 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8356 CXXRecordDecl *ClassDecl = MD->getParent(); 8357 8358 ImplicitExceptionSpecification ExceptSpec(*this); 8359 if (ClassDecl->isInvalidDecl()) 8360 return ExceptSpec; 8361 8362 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8363 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8364 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8365 8366 // C++ [except.spec]p14: 8367 // An implicitly declared special member function (Clause 12) shall have an 8368 // exception-specification. [...] 8369 8370 // It is unspecified whether or not an implicit copy assignment operator 8371 // attempts to deduplicate calls to assignment operators of virtual bases are 8372 // made. As such, this exception specification is effectively unspecified. 8373 // Based on a similar decision made for constness in C++0x, we're erring on 8374 // the side of assuming such calls to be made regardless of whether they 8375 // actually happen. 8376 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8377 BaseEnd = ClassDecl->bases_end(); 8378 Base != BaseEnd; ++Base) { 8379 if (Base->isVirtual()) 8380 continue; 8381 8382 CXXRecordDecl *BaseClassDecl 8383 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8384 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8385 ArgQuals, false, 0)) 8386 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8387 } 8388 8389 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8390 BaseEnd = ClassDecl->vbases_end(); 8391 Base != BaseEnd; ++Base) { 8392 CXXRecordDecl *BaseClassDecl 8393 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8394 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8395 ArgQuals, false, 0)) 8396 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8397 } 8398 8399 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8400 FieldEnd = ClassDecl->field_end(); 8401 Field != FieldEnd; 8402 ++Field) { 8403 QualType FieldType = Context.getBaseElementType(Field->getType()); 8404 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8405 if (CXXMethodDecl *CopyAssign = 8406 LookupCopyingAssignment(FieldClassDecl, 8407 ArgQuals | FieldType.getCVRQualifiers(), 8408 false, 0)) 8409 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8410 } 8411 } 8412 8413 return ExceptSpec; 8414 } 8415 8416 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8417 // Note: The following rules are largely analoguous to the copy 8418 // constructor rules. Note that virtual bases are not taken into account 8419 // for determining the argument type of the operator. Note also that 8420 // operators taking an object instead of a reference are allowed. 8421 assert(ClassDecl->needsImplicitCopyAssignment()); 8422 8423 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8424 if (DSM.isAlreadyBeingDeclared()) 8425 return 0; 8426 8427 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8428 QualType RetType = Context.getLValueReferenceType(ArgType); 8429 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8430 ArgType = ArgType.withConst(); 8431 ArgType = Context.getLValueReferenceType(ArgType); 8432 8433 // An implicitly-declared copy assignment operator is an inline public 8434 // member of its class. 8435 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8436 SourceLocation ClassLoc = ClassDecl->getLocation(); 8437 DeclarationNameInfo NameInfo(Name, ClassLoc); 8438 CXXMethodDecl *CopyAssignment 8439 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8440 /*TInfo=*/0, /*isStatic=*/false, 8441 /*StorageClassAsWritten=*/SC_None, 8442 /*isInline=*/true, /*isConstexpr=*/false, 8443 SourceLocation()); 8444 CopyAssignment->setAccess(AS_public); 8445 CopyAssignment->setDefaulted(); 8446 CopyAssignment->setImplicit(); 8447 8448 // Build an exception specification pointing back at this member. 8449 FunctionProtoType::ExtProtoInfo EPI; 8450 EPI.ExceptionSpecType = EST_Unevaluated; 8451 EPI.ExceptionSpecDecl = CopyAssignment; 8452 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8453 8454 // Add the parameter to the operator. 8455 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8456 ClassLoc, ClassLoc, /*Id=*/0, 8457 ArgType, /*TInfo=*/0, 8458 SC_None, 8459 SC_None, 0); 8460 CopyAssignment->setParams(FromParam); 8461 8462 AddOverriddenMethods(ClassDecl, CopyAssignment); 8463 8464 CopyAssignment->setTrivial( 8465 ClassDecl->needsOverloadResolutionForCopyAssignment() 8466 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8467 : ClassDecl->hasTrivialCopyAssignment()); 8468 8469 // C++0x [class.copy]p19: 8470 // .... If the class definition does not explicitly declare a copy 8471 // assignment operator, there is no user-declared move constructor, and 8472 // there is no user-declared move assignment operator, a copy assignment 8473 // operator is implicitly declared as defaulted. 8474 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8475 CopyAssignment->setDeletedAsWritten(); 8476 8477 // Note that we have added this copy-assignment operator. 8478 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8479 8480 if (Scope *S = getScopeForContext(ClassDecl)) 8481 PushOnScopeChains(CopyAssignment, S, false); 8482 ClassDecl->addDecl(CopyAssignment); 8483 8484 return CopyAssignment; 8485 } 8486 8487 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8488 CXXMethodDecl *CopyAssignOperator) { 8489 assert((CopyAssignOperator->isDefaulted() && 8490 CopyAssignOperator->isOverloadedOperator() && 8491 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8492 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8493 !CopyAssignOperator->isDeleted()) && 8494 "DefineImplicitCopyAssignment called for wrong function"); 8495 8496 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8497 8498 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8499 CopyAssignOperator->setInvalidDecl(); 8500 return; 8501 } 8502 8503 CopyAssignOperator->setUsed(); 8504 8505 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8506 DiagnosticErrorTrap Trap(Diags); 8507 8508 // C++0x [class.copy]p30: 8509 // The implicitly-defined or explicitly-defaulted copy assignment operator 8510 // for a non-union class X performs memberwise copy assignment of its 8511 // subobjects. The direct base classes of X are assigned first, in the 8512 // order of their declaration in the base-specifier-list, and then the 8513 // immediate non-static data members of X are assigned, in the order in 8514 // which they were declared in the class definition. 8515 8516 // The statements that form the synthesized function body. 8517 SmallVector<Stmt*, 8> Statements; 8518 8519 // The parameter for the "other" object, which we are copying from. 8520 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8521 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8522 QualType OtherRefType = Other->getType(); 8523 if (const LValueReferenceType *OtherRef 8524 = OtherRefType->getAs<LValueReferenceType>()) { 8525 OtherRefType = OtherRef->getPointeeType(); 8526 OtherQuals = OtherRefType.getQualifiers(); 8527 } 8528 8529 // Our location for everything implicitly-generated. 8530 SourceLocation Loc = CopyAssignOperator->getLocation(); 8531 8532 // Construct a reference to the "other" object. We'll be using this 8533 // throughout the generated ASTs. 8534 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8535 assert(OtherRef && "Reference to parameter cannot fail!"); 8536 8537 // Construct the "this" pointer. We'll be using this throughout the generated 8538 // ASTs. 8539 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8540 assert(This && "Reference to this cannot fail!"); 8541 8542 // Assign base classes. 8543 bool Invalid = false; 8544 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8545 E = ClassDecl->bases_end(); Base != E; ++Base) { 8546 // Form the assignment: 8547 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8548 QualType BaseType = Base->getType().getUnqualifiedType(); 8549 if (!BaseType->isRecordType()) { 8550 Invalid = true; 8551 continue; 8552 } 8553 8554 CXXCastPath BasePath; 8555 BasePath.push_back(Base); 8556 8557 // Construct the "from" expression, which is an implicit cast to the 8558 // appropriately-qualified base type. 8559 Expr *From = OtherRef; 8560 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8561 CK_UncheckedDerivedToBase, 8562 VK_LValue, &BasePath).take(); 8563 8564 // Dereference "this". 8565 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8566 8567 // Implicitly cast "this" to the appropriately-qualified base type. 8568 To = ImpCastExprToType(To.take(), 8569 Context.getCVRQualifiedType(BaseType, 8570 CopyAssignOperator->getTypeQualifiers()), 8571 CK_UncheckedDerivedToBase, 8572 VK_LValue, &BasePath); 8573 8574 // Build the copy. 8575 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8576 To.get(), From, 8577 /*CopyingBaseSubobject=*/true, 8578 /*Copying=*/true); 8579 if (Copy.isInvalid()) { 8580 Diag(CurrentLocation, diag::note_member_synthesized_at) 8581 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8582 CopyAssignOperator->setInvalidDecl(); 8583 return; 8584 } 8585 8586 // Success! Record the copy. 8587 Statements.push_back(Copy.takeAs<Expr>()); 8588 } 8589 8590 // Assign non-static members. 8591 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8592 FieldEnd = ClassDecl->field_end(); 8593 Field != FieldEnd; ++Field) { 8594 if (Field->isUnnamedBitfield()) 8595 continue; 8596 8597 // Check for members of reference type; we can't copy those. 8598 if (Field->getType()->isReferenceType()) { 8599 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8600 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8601 Diag(Field->getLocation(), diag::note_declared_at); 8602 Diag(CurrentLocation, diag::note_member_synthesized_at) 8603 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8604 Invalid = true; 8605 continue; 8606 } 8607 8608 // Check for members of const-qualified, non-class type. 8609 QualType BaseType = Context.getBaseElementType(Field->getType()); 8610 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8611 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8612 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8613 Diag(Field->getLocation(), diag::note_declared_at); 8614 Diag(CurrentLocation, diag::note_member_synthesized_at) 8615 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8616 Invalid = true; 8617 continue; 8618 } 8619 8620 // Suppress assigning zero-width bitfields. 8621 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8622 continue; 8623 8624 QualType FieldType = Field->getType().getNonReferenceType(); 8625 if (FieldType->isIncompleteArrayType()) { 8626 assert(ClassDecl->hasFlexibleArrayMember() && 8627 "Incomplete array type is not valid"); 8628 continue; 8629 } 8630 8631 // Build references to the field in the object we're copying from and to. 8632 CXXScopeSpec SS; // Intentionally empty 8633 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8634 LookupMemberName); 8635 MemberLookup.addDecl(*Field); 8636 MemberLookup.resolveKind(); 8637 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8638 Loc, /*IsArrow=*/false, 8639 SS, SourceLocation(), 0, 8640 MemberLookup, 0); 8641 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8642 Loc, /*IsArrow=*/true, 8643 SS, SourceLocation(), 0, 8644 MemberLookup, 0); 8645 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8646 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8647 8648 // Build the copy of this field. 8649 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8650 To.get(), From.get(), 8651 /*CopyingBaseSubobject=*/false, 8652 /*Copying=*/true); 8653 if (Copy.isInvalid()) { 8654 Diag(CurrentLocation, diag::note_member_synthesized_at) 8655 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8656 CopyAssignOperator->setInvalidDecl(); 8657 return; 8658 } 8659 8660 // Success! Record the copy. 8661 Statements.push_back(Copy.takeAs<Stmt>()); 8662 } 8663 8664 if (!Invalid) { 8665 // Add a "return *this;" 8666 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8667 8668 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8669 if (Return.isInvalid()) 8670 Invalid = true; 8671 else { 8672 Statements.push_back(Return.takeAs<Stmt>()); 8673 8674 if (Trap.hasErrorOccurred()) { 8675 Diag(CurrentLocation, diag::note_member_synthesized_at) 8676 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8677 Invalid = true; 8678 } 8679 } 8680 } 8681 8682 if (Invalid) { 8683 CopyAssignOperator->setInvalidDecl(); 8684 return; 8685 } 8686 8687 StmtResult Body; 8688 { 8689 CompoundScopeRAII CompoundScope(*this); 8690 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8691 /*isStmtExpr=*/false); 8692 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8693 } 8694 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8695 8696 if (ASTMutationListener *L = getASTMutationListener()) { 8697 L->CompletedImplicitDefinition(CopyAssignOperator); 8698 } 8699 } 8700 8701 Sema::ImplicitExceptionSpecification 8702 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8703 CXXRecordDecl *ClassDecl = MD->getParent(); 8704 8705 ImplicitExceptionSpecification ExceptSpec(*this); 8706 if (ClassDecl->isInvalidDecl()) 8707 return ExceptSpec; 8708 8709 // C++0x [except.spec]p14: 8710 // An implicitly declared special member function (Clause 12) shall have an 8711 // exception-specification. [...] 8712 8713 // It is unspecified whether or not an implicit move assignment operator 8714 // attempts to deduplicate calls to assignment operators of virtual bases are 8715 // made. As such, this exception specification is effectively unspecified. 8716 // Based on a similar decision made for constness in C++0x, we're erring on 8717 // the side of assuming such calls to be made regardless of whether they 8718 // actually happen. 8719 // Note that a move constructor is not implicitly declared when there are 8720 // virtual bases, but it can still be user-declared and explicitly defaulted. 8721 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8722 BaseEnd = ClassDecl->bases_end(); 8723 Base != BaseEnd; ++Base) { 8724 if (Base->isVirtual()) 8725 continue; 8726 8727 CXXRecordDecl *BaseClassDecl 8728 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8729 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8730 0, false, 0)) 8731 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8732 } 8733 8734 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8735 BaseEnd = ClassDecl->vbases_end(); 8736 Base != BaseEnd; ++Base) { 8737 CXXRecordDecl *BaseClassDecl 8738 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8739 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8740 0, false, 0)) 8741 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8742 } 8743 8744 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8745 FieldEnd = ClassDecl->field_end(); 8746 Field != FieldEnd; 8747 ++Field) { 8748 QualType FieldType = Context.getBaseElementType(Field->getType()); 8749 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8750 if (CXXMethodDecl *MoveAssign = 8751 LookupMovingAssignment(FieldClassDecl, 8752 FieldType.getCVRQualifiers(), 8753 false, 0)) 8754 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8755 } 8756 } 8757 8758 return ExceptSpec; 8759 } 8760 8761 /// Determine whether the class type has any direct or indirect virtual base 8762 /// classes which have a non-trivial move assignment operator. 8763 static bool 8764 hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8765 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8766 BaseEnd = ClassDecl->vbases_end(); 8767 Base != BaseEnd; ++Base) { 8768 CXXRecordDecl *BaseClass = 8769 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8770 8771 // Try to declare the move assignment. If it would be deleted, then the 8772 // class does not have a non-trivial move assignment. 8773 if (BaseClass->needsImplicitMoveAssignment()) 8774 S.DeclareImplicitMoveAssignment(BaseClass); 8775 8776 if (BaseClass->hasNonTrivialMoveAssignment()) 8777 return true; 8778 } 8779 8780 return false; 8781 } 8782 8783 /// Determine whether the given type either has a move constructor or is 8784 /// trivially copyable. 8785 static bool 8786 hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8787 Type = S.Context.getBaseElementType(Type); 8788 8789 // FIXME: Technically, non-trivially-copyable non-class types, such as 8790 // reference types, are supposed to return false here, but that appears 8791 // to be a standard defect. 8792 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8793 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8794 return true; 8795 8796 if (Type.isTriviallyCopyableType(S.Context)) 8797 return true; 8798 8799 if (IsConstructor) { 8800 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 8801 // give the right answer. 8802 if (ClassDecl->needsImplicitMoveConstructor()) 8803 S.DeclareImplicitMoveConstructor(ClassDecl); 8804 return ClassDecl->hasMoveConstructor(); 8805 } 8806 8807 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 8808 // give the right answer. 8809 if (ClassDecl->needsImplicitMoveAssignment()) 8810 S.DeclareImplicitMoveAssignment(ClassDecl); 8811 return ClassDecl->hasMoveAssignment(); 8812 } 8813 8814 /// Determine whether all non-static data members and direct or virtual bases 8815 /// of class \p ClassDecl have either a move operation, or are trivially 8816 /// copyable. 8817 static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8818 bool IsConstructor) { 8819 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8820 BaseEnd = ClassDecl->bases_end(); 8821 Base != BaseEnd; ++Base) { 8822 if (Base->isVirtual()) 8823 continue; 8824 8825 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8826 return false; 8827 } 8828 8829 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8830 BaseEnd = ClassDecl->vbases_end(); 8831 Base != BaseEnd; ++Base) { 8832 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8833 return false; 8834 } 8835 8836 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8837 FieldEnd = ClassDecl->field_end(); 8838 Field != FieldEnd; ++Field) { 8839 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8840 return false; 8841 } 8842 8843 return true; 8844 } 8845 8846 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8847 // C++11 [class.copy]p20: 8848 // If the definition of a class X does not explicitly declare a move 8849 // assignment operator, one will be implicitly declared as defaulted 8850 // if and only if: 8851 // 8852 // - [first 4 bullets] 8853 assert(ClassDecl->needsImplicitMoveAssignment()); 8854 8855 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 8856 if (DSM.isAlreadyBeingDeclared()) 8857 return 0; 8858 8859 // [Checked after we build the declaration] 8860 // - the move assignment operator would not be implicitly defined as 8861 // deleted, 8862 8863 // [DR1402]: 8864 // - X has no direct or indirect virtual base class with a non-trivial 8865 // move assignment operator, and 8866 // - each of X's non-static data members and direct or virtual base classes 8867 // has a type that either has a move assignment operator or is trivially 8868 // copyable. 8869 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8870 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8871 ClassDecl->setFailedImplicitMoveAssignment(); 8872 return 0; 8873 } 8874 8875 // Note: The following rules are largely analoguous to the move 8876 // constructor rules. 8877 8878 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8879 QualType RetType = Context.getLValueReferenceType(ArgType); 8880 ArgType = Context.getRValueReferenceType(ArgType); 8881 8882 // An implicitly-declared move assignment operator is an inline public 8883 // member of its class. 8884 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8885 SourceLocation ClassLoc = ClassDecl->getLocation(); 8886 DeclarationNameInfo NameInfo(Name, ClassLoc); 8887 CXXMethodDecl *MoveAssignment 8888 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8889 /*TInfo=*/0, /*isStatic=*/false, 8890 /*StorageClassAsWritten=*/SC_None, 8891 /*isInline=*/true, 8892 /*isConstexpr=*/false, 8893 SourceLocation()); 8894 MoveAssignment->setAccess(AS_public); 8895 MoveAssignment->setDefaulted(); 8896 MoveAssignment->setImplicit(); 8897 8898 // Build an exception specification pointing back at this member. 8899 FunctionProtoType::ExtProtoInfo EPI; 8900 EPI.ExceptionSpecType = EST_Unevaluated; 8901 EPI.ExceptionSpecDecl = MoveAssignment; 8902 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8903 8904 // Add the parameter to the operator. 8905 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8906 ClassLoc, ClassLoc, /*Id=*/0, 8907 ArgType, /*TInfo=*/0, 8908 SC_None, 8909 SC_None, 0); 8910 MoveAssignment->setParams(FromParam); 8911 8912 AddOverriddenMethods(ClassDecl, MoveAssignment); 8913 8914 MoveAssignment->setTrivial( 8915 ClassDecl->needsOverloadResolutionForMoveAssignment() 8916 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 8917 : ClassDecl->hasTrivialMoveAssignment()); 8918 8919 // C++0x [class.copy]p9: 8920 // If the definition of a class X does not explicitly declare a move 8921 // assignment operator, one will be implicitly declared as defaulted if and 8922 // only if: 8923 // [...] 8924 // - the move assignment operator would not be implicitly defined as 8925 // deleted. 8926 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8927 // Cache this result so that we don't try to generate this over and over 8928 // on every lookup, leaking memory and wasting time. 8929 ClassDecl->setFailedImplicitMoveAssignment(); 8930 return 0; 8931 } 8932 8933 // Note that we have added this copy-assignment operator. 8934 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8935 8936 if (Scope *S = getScopeForContext(ClassDecl)) 8937 PushOnScopeChains(MoveAssignment, S, false); 8938 ClassDecl->addDecl(MoveAssignment); 8939 8940 return MoveAssignment; 8941 } 8942 8943 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8944 CXXMethodDecl *MoveAssignOperator) { 8945 assert((MoveAssignOperator->isDefaulted() && 8946 MoveAssignOperator->isOverloadedOperator() && 8947 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8948 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8949 !MoveAssignOperator->isDeleted()) && 8950 "DefineImplicitMoveAssignment called for wrong function"); 8951 8952 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8953 8954 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8955 MoveAssignOperator->setInvalidDecl(); 8956 return; 8957 } 8958 8959 MoveAssignOperator->setUsed(); 8960 8961 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8962 DiagnosticErrorTrap Trap(Diags); 8963 8964 // C++0x [class.copy]p28: 8965 // The implicitly-defined or move assignment operator for a non-union class 8966 // X performs memberwise move assignment of its subobjects. The direct base 8967 // classes of X are assigned first, in the order of their declaration in the 8968 // base-specifier-list, and then the immediate non-static data members of X 8969 // are assigned, in the order in which they were declared in the class 8970 // definition. 8971 8972 // The statements that form the synthesized function body. 8973 SmallVector<Stmt*, 8> Statements; 8974 8975 // The parameter for the "other" object, which we are move from. 8976 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8977 QualType OtherRefType = Other->getType()-> 8978 getAs<RValueReferenceType>()->getPointeeType(); 8979 assert(OtherRefType.getQualifiers() == 0 && 8980 "Bad argument type of defaulted move assignment"); 8981 8982 // Our location for everything implicitly-generated. 8983 SourceLocation Loc = MoveAssignOperator->getLocation(); 8984 8985 // Construct a reference to the "other" object. We'll be using this 8986 // throughout the generated ASTs. 8987 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8988 assert(OtherRef && "Reference to parameter cannot fail!"); 8989 // Cast to rvalue. 8990 OtherRef = CastForMoving(*this, OtherRef); 8991 8992 // Construct the "this" pointer. We'll be using this throughout the generated 8993 // ASTs. 8994 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8995 assert(This && "Reference to this cannot fail!"); 8996 8997 // Assign base classes. 8998 bool Invalid = false; 8999 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9000 E = ClassDecl->bases_end(); Base != E; ++Base) { 9001 // Form the assignment: 9002 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9003 QualType BaseType = Base->getType().getUnqualifiedType(); 9004 if (!BaseType->isRecordType()) { 9005 Invalid = true; 9006 continue; 9007 } 9008 9009 CXXCastPath BasePath; 9010 BasePath.push_back(Base); 9011 9012 // Construct the "from" expression, which is an implicit cast to the 9013 // appropriately-qualified base type. 9014 Expr *From = OtherRef; 9015 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9016 VK_XValue, &BasePath).take(); 9017 9018 // Dereference "this". 9019 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9020 9021 // Implicitly cast "this" to the appropriately-qualified base type. 9022 To = ImpCastExprToType(To.take(), 9023 Context.getCVRQualifiedType(BaseType, 9024 MoveAssignOperator->getTypeQualifiers()), 9025 CK_UncheckedDerivedToBase, 9026 VK_LValue, &BasePath); 9027 9028 // Build the move. 9029 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9030 To.get(), From, 9031 /*CopyingBaseSubobject=*/true, 9032 /*Copying=*/false); 9033 if (Move.isInvalid()) { 9034 Diag(CurrentLocation, diag::note_member_synthesized_at) 9035 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9036 MoveAssignOperator->setInvalidDecl(); 9037 return; 9038 } 9039 9040 // Success! Record the move. 9041 Statements.push_back(Move.takeAs<Expr>()); 9042 } 9043 9044 // Assign non-static members. 9045 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9046 FieldEnd = ClassDecl->field_end(); 9047 Field != FieldEnd; ++Field) { 9048 if (Field->isUnnamedBitfield()) 9049 continue; 9050 9051 // Check for members of reference type; we can't move those. 9052 if (Field->getType()->isReferenceType()) { 9053 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9054 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9055 Diag(Field->getLocation(), diag::note_declared_at); 9056 Diag(CurrentLocation, diag::note_member_synthesized_at) 9057 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9058 Invalid = true; 9059 continue; 9060 } 9061 9062 // Check for members of const-qualified, non-class type. 9063 QualType BaseType = Context.getBaseElementType(Field->getType()); 9064 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9065 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9066 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9067 Diag(Field->getLocation(), diag::note_declared_at); 9068 Diag(CurrentLocation, diag::note_member_synthesized_at) 9069 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9070 Invalid = true; 9071 continue; 9072 } 9073 9074 // Suppress assigning zero-width bitfields. 9075 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9076 continue; 9077 9078 QualType FieldType = Field->getType().getNonReferenceType(); 9079 if (FieldType->isIncompleteArrayType()) { 9080 assert(ClassDecl->hasFlexibleArrayMember() && 9081 "Incomplete array type is not valid"); 9082 continue; 9083 } 9084 9085 // Build references to the field in the object we're copying from and to. 9086 CXXScopeSpec SS; // Intentionally empty 9087 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9088 LookupMemberName); 9089 MemberLookup.addDecl(*Field); 9090 MemberLookup.resolveKind(); 9091 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9092 Loc, /*IsArrow=*/false, 9093 SS, SourceLocation(), 0, 9094 MemberLookup, 0); 9095 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9096 Loc, /*IsArrow=*/true, 9097 SS, SourceLocation(), 0, 9098 MemberLookup, 0); 9099 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9100 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9101 9102 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9103 "Member reference with rvalue base must be rvalue except for reference " 9104 "members, which aren't allowed for move assignment."); 9105 9106 // Build the move of this field. 9107 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9108 To.get(), From.get(), 9109 /*CopyingBaseSubobject=*/false, 9110 /*Copying=*/false); 9111 if (Move.isInvalid()) { 9112 Diag(CurrentLocation, diag::note_member_synthesized_at) 9113 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9114 MoveAssignOperator->setInvalidDecl(); 9115 return; 9116 } 9117 9118 // Success! Record the copy. 9119 Statements.push_back(Move.takeAs<Stmt>()); 9120 } 9121 9122 if (!Invalid) { 9123 // Add a "return *this;" 9124 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9125 9126 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9127 if (Return.isInvalid()) 9128 Invalid = true; 9129 else { 9130 Statements.push_back(Return.takeAs<Stmt>()); 9131 9132 if (Trap.hasErrorOccurred()) { 9133 Diag(CurrentLocation, diag::note_member_synthesized_at) 9134 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9135 Invalid = true; 9136 } 9137 } 9138 } 9139 9140 if (Invalid) { 9141 MoveAssignOperator->setInvalidDecl(); 9142 return; 9143 } 9144 9145 StmtResult Body; 9146 { 9147 CompoundScopeRAII CompoundScope(*this); 9148 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9149 /*isStmtExpr=*/false); 9150 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9151 } 9152 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9153 9154 if (ASTMutationListener *L = getASTMutationListener()) { 9155 L->CompletedImplicitDefinition(MoveAssignOperator); 9156 } 9157 } 9158 9159 Sema::ImplicitExceptionSpecification 9160 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9161 CXXRecordDecl *ClassDecl = MD->getParent(); 9162 9163 ImplicitExceptionSpecification ExceptSpec(*this); 9164 if (ClassDecl->isInvalidDecl()) 9165 return ExceptSpec; 9166 9167 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9168 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9169 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9170 9171 // C++ [except.spec]p14: 9172 // An implicitly declared special member function (Clause 12) shall have an 9173 // exception-specification. [...] 9174 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9175 BaseEnd = ClassDecl->bases_end(); 9176 Base != BaseEnd; 9177 ++Base) { 9178 // Virtual bases are handled below. 9179 if (Base->isVirtual()) 9180 continue; 9181 9182 CXXRecordDecl *BaseClassDecl 9183 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9184 if (CXXConstructorDecl *CopyConstructor = 9185 LookupCopyingConstructor(BaseClassDecl, Quals)) 9186 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9187 } 9188 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9189 BaseEnd = ClassDecl->vbases_end(); 9190 Base != BaseEnd; 9191 ++Base) { 9192 CXXRecordDecl *BaseClassDecl 9193 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9194 if (CXXConstructorDecl *CopyConstructor = 9195 LookupCopyingConstructor(BaseClassDecl, Quals)) 9196 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9197 } 9198 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9199 FieldEnd = ClassDecl->field_end(); 9200 Field != FieldEnd; 9201 ++Field) { 9202 QualType FieldType = Context.getBaseElementType(Field->getType()); 9203 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9204 if (CXXConstructorDecl *CopyConstructor = 9205 LookupCopyingConstructor(FieldClassDecl, 9206 Quals | FieldType.getCVRQualifiers())) 9207 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9208 } 9209 } 9210 9211 return ExceptSpec; 9212 } 9213 9214 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9215 CXXRecordDecl *ClassDecl) { 9216 // C++ [class.copy]p4: 9217 // If the class definition does not explicitly declare a copy 9218 // constructor, one is declared implicitly. 9219 assert(ClassDecl->needsImplicitCopyConstructor()); 9220 9221 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9222 if (DSM.isAlreadyBeingDeclared()) 9223 return 0; 9224 9225 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9226 QualType ArgType = ClassType; 9227 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9228 if (Const) 9229 ArgType = ArgType.withConst(); 9230 ArgType = Context.getLValueReferenceType(ArgType); 9231 9232 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9233 CXXCopyConstructor, 9234 Const); 9235 9236 DeclarationName Name 9237 = Context.DeclarationNames.getCXXConstructorName( 9238 Context.getCanonicalType(ClassType)); 9239 SourceLocation ClassLoc = ClassDecl->getLocation(); 9240 DeclarationNameInfo NameInfo(Name, ClassLoc); 9241 9242 // An implicitly-declared copy constructor is an inline public 9243 // member of its class. 9244 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9245 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9246 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9247 Constexpr); 9248 CopyConstructor->setAccess(AS_public); 9249 CopyConstructor->setDefaulted(); 9250 9251 // Build an exception specification pointing back at this member. 9252 FunctionProtoType::ExtProtoInfo EPI; 9253 EPI.ExceptionSpecType = EST_Unevaluated; 9254 EPI.ExceptionSpecDecl = CopyConstructor; 9255 CopyConstructor->setType( 9256 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9257 9258 // Add the parameter to the constructor. 9259 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9260 ClassLoc, ClassLoc, 9261 /*IdentifierInfo=*/0, 9262 ArgType, /*TInfo=*/0, 9263 SC_None, 9264 SC_None, 0); 9265 CopyConstructor->setParams(FromParam); 9266 9267 CopyConstructor->setTrivial( 9268 ClassDecl->needsOverloadResolutionForCopyConstructor() 9269 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9270 : ClassDecl->hasTrivialCopyConstructor()); 9271 9272 // C++11 [class.copy]p8: 9273 // ... If the class definition does not explicitly declare a copy 9274 // constructor, there is no user-declared move constructor, and there is no 9275 // user-declared move assignment operator, a copy constructor is implicitly 9276 // declared as defaulted. 9277 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9278 CopyConstructor->setDeletedAsWritten(); 9279 9280 // Note that we have declared this constructor. 9281 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9282 9283 if (Scope *S = getScopeForContext(ClassDecl)) 9284 PushOnScopeChains(CopyConstructor, S, false); 9285 ClassDecl->addDecl(CopyConstructor); 9286 9287 return CopyConstructor; 9288 } 9289 9290 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9291 CXXConstructorDecl *CopyConstructor) { 9292 assert((CopyConstructor->isDefaulted() && 9293 CopyConstructor->isCopyConstructor() && 9294 !CopyConstructor->doesThisDeclarationHaveABody() && 9295 !CopyConstructor->isDeleted()) && 9296 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9297 9298 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9299 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9300 9301 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9302 DiagnosticErrorTrap Trap(Diags); 9303 9304 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9305 Trap.hasErrorOccurred()) { 9306 Diag(CurrentLocation, diag::note_member_synthesized_at) 9307 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9308 CopyConstructor->setInvalidDecl(); 9309 } else { 9310 Sema::CompoundScopeRAII CompoundScope(*this); 9311 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9312 CopyConstructor->getLocation(), 9313 MultiStmtArg(), 9314 /*isStmtExpr=*/false) 9315 .takeAs<Stmt>()); 9316 CopyConstructor->setImplicitlyDefined(true); 9317 } 9318 9319 CopyConstructor->setUsed(); 9320 if (ASTMutationListener *L = getASTMutationListener()) { 9321 L->CompletedImplicitDefinition(CopyConstructor); 9322 } 9323 } 9324 9325 Sema::ImplicitExceptionSpecification 9326 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9327 CXXRecordDecl *ClassDecl = MD->getParent(); 9328 9329 // C++ [except.spec]p14: 9330 // An implicitly declared special member function (Clause 12) shall have an 9331 // exception-specification. [...] 9332 ImplicitExceptionSpecification ExceptSpec(*this); 9333 if (ClassDecl->isInvalidDecl()) 9334 return ExceptSpec; 9335 9336 // Direct base-class constructors. 9337 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9338 BEnd = ClassDecl->bases_end(); 9339 B != BEnd; ++B) { 9340 if (B->isVirtual()) // Handled below. 9341 continue; 9342 9343 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9344 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9345 CXXConstructorDecl *Constructor = 9346 LookupMovingConstructor(BaseClassDecl, 0); 9347 // If this is a deleted function, add it anyway. This might be conformant 9348 // with the standard. This might not. I'm not sure. It might not matter. 9349 if (Constructor) 9350 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9351 } 9352 } 9353 9354 // Virtual base-class constructors. 9355 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9356 BEnd = ClassDecl->vbases_end(); 9357 B != BEnd; ++B) { 9358 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9359 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9360 CXXConstructorDecl *Constructor = 9361 LookupMovingConstructor(BaseClassDecl, 0); 9362 // If this is a deleted function, add it anyway. This might be conformant 9363 // with the standard. This might not. I'm not sure. It might not matter. 9364 if (Constructor) 9365 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9366 } 9367 } 9368 9369 // Field constructors. 9370 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9371 FEnd = ClassDecl->field_end(); 9372 F != FEnd; ++F) { 9373 QualType FieldType = Context.getBaseElementType(F->getType()); 9374 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9375 CXXConstructorDecl *Constructor = 9376 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9377 // If this is a deleted function, add it anyway. This might be conformant 9378 // with the standard. This might not. I'm not sure. It might not matter. 9379 // In particular, the problem is that this function never gets called. It 9380 // might just be ill-formed because this function attempts to refer to 9381 // a deleted function here. 9382 if (Constructor) 9383 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9384 } 9385 } 9386 9387 return ExceptSpec; 9388 } 9389 9390 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9391 CXXRecordDecl *ClassDecl) { 9392 // C++11 [class.copy]p9: 9393 // If the definition of a class X does not explicitly declare a move 9394 // constructor, one will be implicitly declared as defaulted if and only if: 9395 // 9396 // - [first 4 bullets] 9397 assert(ClassDecl->needsImplicitMoveConstructor()); 9398 9399 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9400 if (DSM.isAlreadyBeingDeclared()) 9401 return 0; 9402 9403 // [Checked after we build the declaration] 9404 // - the move assignment operator would not be implicitly defined as 9405 // deleted, 9406 9407 // [DR1402]: 9408 // - each of X's non-static data members and direct or virtual base classes 9409 // has a type that either has a move constructor or is trivially copyable. 9410 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9411 ClassDecl->setFailedImplicitMoveConstructor(); 9412 return 0; 9413 } 9414 9415 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9416 QualType ArgType = Context.getRValueReferenceType(ClassType); 9417 9418 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9419 CXXMoveConstructor, 9420 false); 9421 9422 DeclarationName Name 9423 = Context.DeclarationNames.getCXXConstructorName( 9424 Context.getCanonicalType(ClassType)); 9425 SourceLocation ClassLoc = ClassDecl->getLocation(); 9426 DeclarationNameInfo NameInfo(Name, ClassLoc); 9427 9428 // C++0x [class.copy]p11: 9429 // An implicitly-declared copy/move constructor is an inline public 9430 // member of its class. 9431 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9432 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9433 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9434 Constexpr); 9435 MoveConstructor->setAccess(AS_public); 9436 MoveConstructor->setDefaulted(); 9437 9438 // Build an exception specification pointing back at this member. 9439 FunctionProtoType::ExtProtoInfo EPI; 9440 EPI.ExceptionSpecType = EST_Unevaluated; 9441 EPI.ExceptionSpecDecl = MoveConstructor; 9442 MoveConstructor->setType( 9443 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9444 9445 // Add the parameter to the constructor. 9446 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9447 ClassLoc, ClassLoc, 9448 /*IdentifierInfo=*/0, 9449 ArgType, /*TInfo=*/0, 9450 SC_None, 9451 SC_None, 0); 9452 MoveConstructor->setParams(FromParam); 9453 9454 MoveConstructor->setTrivial( 9455 ClassDecl->needsOverloadResolutionForMoveConstructor() 9456 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9457 : ClassDecl->hasTrivialMoveConstructor()); 9458 9459 // C++0x [class.copy]p9: 9460 // If the definition of a class X does not explicitly declare a move 9461 // constructor, one will be implicitly declared as defaulted if and only if: 9462 // [...] 9463 // - the move constructor would not be implicitly defined as deleted. 9464 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9465 // Cache this result so that we don't try to generate this over and over 9466 // on every lookup, leaking memory and wasting time. 9467 ClassDecl->setFailedImplicitMoveConstructor(); 9468 return 0; 9469 } 9470 9471 // Note that we have declared this constructor. 9472 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9473 9474 if (Scope *S = getScopeForContext(ClassDecl)) 9475 PushOnScopeChains(MoveConstructor, S, false); 9476 ClassDecl->addDecl(MoveConstructor); 9477 9478 return MoveConstructor; 9479 } 9480 9481 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9482 CXXConstructorDecl *MoveConstructor) { 9483 assert((MoveConstructor->isDefaulted() && 9484 MoveConstructor->isMoveConstructor() && 9485 !MoveConstructor->doesThisDeclarationHaveABody() && 9486 !MoveConstructor->isDeleted()) && 9487 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9488 9489 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9490 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9491 9492 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9493 DiagnosticErrorTrap Trap(Diags); 9494 9495 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9496 Trap.hasErrorOccurred()) { 9497 Diag(CurrentLocation, diag::note_member_synthesized_at) 9498 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9499 MoveConstructor->setInvalidDecl(); 9500 } else { 9501 Sema::CompoundScopeRAII CompoundScope(*this); 9502 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9503 MoveConstructor->getLocation(), 9504 MultiStmtArg(), 9505 /*isStmtExpr=*/false) 9506 .takeAs<Stmt>()); 9507 MoveConstructor->setImplicitlyDefined(true); 9508 } 9509 9510 MoveConstructor->setUsed(); 9511 9512 if (ASTMutationListener *L = getASTMutationListener()) { 9513 L->CompletedImplicitDefinition(MoveConstructor); 9514 } 9515 } 9516 9517 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9518 return FD->isDeleted() && 9519 (FD->isDefaulted() || FD->isImplicit()) && 9520 isa<CXXMethodDecl>(FD); 9521 } 9522 9523 /// \brief Mark the call operator of the given lambda closure type as "used". 9524 static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9525 CXXMethodDecl *CallOperator 9526 = cast<CXXMethodDecl>( 9527 Lambda->lookup( 9528 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9529 CallOperator->setReferenced(); 9530 CallOperator->setUsed(); 9531 } 9532 9533 void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9534 SourceLocation CurrentLocation, 9535 CXXConversionDecl *Conv) 9536 { 9537 CXXRecordDecl *Lambda = Conv->getParent(); 9538 9539 // Make sure that the lambda call operator is marked used. 9540 markLambdaCallOperatorUsed(*this, Lambda); 9541 9542 Conv->setUsed(); 9543 9544 SynthesizedFunctionScope Scope(*this, Conv); 9545 DiagnosticErrorTrap Trap(Diags); 9546 9547 // Return the address of the __invoke function. 9548 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9549 CXXMethodDecl *Invoke 9550 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9551 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9552 VK_LValue, Conv->getLocation()).take(); 9553 assert(FunctionRef && "Can't refer to __invoke function?"); 9554 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9555 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9556 Conv->getLocation(), 9557 Conv->getLocation())); 9558 9559 // Fill in the __invoke function with a dummy implementation. IR generation 9560 // will fill in the actual details. 9561 Invoke->setUsed(); 9562 Invoke->setReferenced(); 9563 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9564 9565 if (ASTMutationListener *L = getASTMutationListener()) { 9566 L->CompletedImplicitDefinition(Conv); 9567 L->CompletedImplicitDefinition(Invoke); 9568 } 9569 } 9570 9571 void Sema::DefineImplicitLambdaToBlockPointerConversion( 9572 SourceLocation CurrentLocation, 9573 CXXConversionDecl *Conv) 9574 { 9575 Conv->setUsed(); 9576 9577 SynthesizedFunctionScope Scope(*this, Conv); 9578 DiagnosticErrorTrap Trap(Diags); 9579 9580 // Copy-initialize the lambda object as needed to capture it. 9581 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9582 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9583 9584 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9585 Conv->getLocation(), 9586 Conv, DerefThis); 9587 9588 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9589 // behavior. Note that only the general conversion function does this 9590 // (since it's unusable otherwise); in the case where we inline the 9591 // block literal, it has block literal lifetime semantics. 9592 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9593 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9594 CK_CopyAndAutoreleaseBlockObject, 9595 BuildBlock.get(), 0, VK_RValue); 9596 9597 if (BuildBlock.isInvalid()) { 9598 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9599 Conv->setInvalidDecl(); 9600 return; 9601 } 9602 9603 // Create the return statement that returns the block from the conversion 9604 // function. 9605 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9606 if (Return.isInvalid()) { 9607 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9608 Conv->setInvalidDecl(); 9609 return; 9610 } 9611 9612 // Set the body of the conversion function. 9613 Stmt *ReturnS = Return.take(); 9614 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9615 Conv->getLocation(), 9616 Conv->getLocation())); 9617 9618 // We're done; notify the mutation listener, if any. 9619 if (ASTMutationListener *L = getASTMutationListener()) { 9620 L->CompletedImplicitDefinition(Conv); 9621 } 9622 } 9623 9624 /// \brief Determine whether the given list arguments contains exactly one 9625 /// "real" (non-default) argument. 9626 static bool hasOneRealArgument(MultiExprArg Args) { 9627 switch (Args.size()) { 9628 case 0: 9629 return false; 9630 9631 default: 9632 if (!Args[1]->isDefaultArgument()) 9633 return false; 9634 9635 // fall through 9636 case 1: 9637 return !Args[0]->isDefaultArgument(); 9638 } 9639 9640 return false; 9641 } 9642 9643 ExprResult 9644 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9645 CXXConstructorDecl *Constructor, 9646 MultiExprArg ExprArgs, 9647 bool HadMultipleCandidates, 9648 bool IsListInitialization, 9649 bool RequiresZeroInit, 9650 unsigned ConstructKind, 9651 SourceRange ParenRange) { 9652 bool Elidable = false; 9653 9654 // C++0x [class.copy]p34: 9655 // When certain criteria are met, an implementation is allowed to 9656 // omit the copy/move construction of a class object, even if the 9657 // copy/move constructor and/or destructor for the object have 9658 // side effects. [...] 9659 // - when a temporary class object that has not been bound to a 9660 // reference (12.2) would be copied/moved to a class object 9661 // with the same cv-unqualified type, the copy/move operation 9662 // can be omitted by constructing the temporary object 9663 // directly into the target of the omitted copy/move 9664 if (ConstructKind == CXXConstructExpr::CK_Complete && 9665 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9666 Expr *SubExpr = ExprArgs[0]; 9667 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9668 } 9669 9670 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9671 Elidable, ExprArgs, HadMultipleCandidates, 9672 IsListInitialization, RequiresZeroInit, 9673 ConstructKind, ParenRange); 9674 } 9675 9676 /// BuildCXXConstructExpr - Creates a complete call to a constructor, 9677 /// including handling of its default argument expressions. 9678 ExprResult 9679 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9680 CXXConstructorDecl *Constructor, bool Elidable, 9681 MultiExprArg ExprArgs, 9682 bool HadMultipleCandidates, 9683 bool IsListInitialization, 9684 bool RequiresZeroInit, 9685 unsigned ConstructKind, 9686 SourceRange ParenRange) { 9687 MarkFunctionReferenced(ConstructLoc, Constructor); 9688 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9689 Constructor, Elidable, ExprArgs, 9690 HadMultipleCandidates, 9691 IsListInitialization, RequiresZeroInit, 9692 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9693 ParenRange)); 9694 } 9695 9696 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9697 if (VD->isInvalidDecl()) return; 9698 9699 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9700 if (ClassDecl->isInvalidDecl()) return; 9701 if (ClassDecl->hasIrrelevantDestructor()) return; 9702 if (ClassDecl->isDependentContext()) return; 9703 9704 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9705 MarkFunctionReferenced(VD->getLocation(), Destructor); 9706 CheckDestructorAccess(VD->getLocation(), Destructor, 9707 PDiag(diag::err_access_dtor_var) 9708 << VD->getDeclName() 9709 << VD->getType()); 9710 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9711 9712 if (!VD->hasGlobalStorage()) return; 9713 9714 // Emit warning for non-trivial dtor in global scope (a real global, 9715 // class-static, function-static). 9716 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9717 9718 // TODO: this should be re-enabled for static locals by !CXAAtExit 9719 if (!VD->isStaticLocal()) 9720 Diag(VD->getLocation(), diag::warn_global_destructor); 9721 } 9722 9723 /// \brief Given a constructor and the set of arguments provided for the 9724 /// constructor, convert the arguments and add any required default arguments 9725 /// to form a proper call to this constructor. 9726 /// 9727 /// \returns true if an error occurred, false otherwise. 9728 bool 9729 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9730 MultiExprArg ArgsPtr, 9731 SourceLocation Loc, 9732 SmallVectorImpl<Expr*> &ConvertedArgs, 9733 bool AllowExplicit, 9734 bool IsListInitialization) { 9735 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9736 unsigned NumArgs = ArgsPtr.size(); 9737 Expr **Args = ArgsPtr.data(); 9738 9739 const FunctionProtoType *Proto 9740 = Constructor->getType()->getAs<FunctionProtoType>(); 9741 assert(Proto && "Constructor without a prototype?"); 9742 unsigned NumArgsInProto = Proto->getNumArgs(); 9743 9744 // If too few arguments are available, we'll fill in the rest with defaults. 9745 if (NumArgs < NumArgsInProto) 9746 ConvertedArgs.reserve(NumArgsInProto); 9747 else 9748 ConvertedArgs.reserve(NumArgs); 9749 9750 VariadicCallType CallType = 9751 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9752 SmallVector<Expr *, 8> AllArgs; 9753 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9754 Proto, 0, Args, NumArgs, AllArgs, 9755 CallType, AllowExplicit, 9756 IsListInitialization); 9757 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9758 9759 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9760 9761 CheckConstructorCall(Constructor, 9762 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 9763 AllArgs.size()), 9764 Proto, Loc); 9765 9766 return Invalid; 9767 } 9768 9769 static inline bool 9770 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9771 const FunctionDecl *FnDecl) { 9772 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9773 if (isa<NamespaceDecl>(DC)) { 9774 return SemaRef.Diag(FnDecl->getLocation(), 9775 diag::err_operator_new_delete_declared_in_namespace) 9776 << FnDecl->getDeclName(); 9777 } 9778 9779 if (isa<TranslationUnitDecl>(DC) && 9780 FnDecl->getStorageClass() == SC_Static) { 9781 return SemaRef.Diag(FnDecl->getLocation(), 9782 diag::err_operator_new_delete_declared_static) 9783 << FnDecl->getDeclName(); 9784 } 9785 9786 return false; 9787 } 9788 9789 static inline bool 9790 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9791 CanQualType ExpectedResultType, 9792 CanQualType ExpectedFirstParamType, 9793 unsigned DependentParamTypeDiag, 9794 unsigned InvalidParamTypeDiag) { 9795 QualType ResultType = 9796 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9797 9798 // Check that the result type is not dependent. 9799 if (ResultType->isDependentType()) 9800 return SemaRef.Diag(FnDecl->getLocation(), 9801 diag::err_operator_new_delete_dependent_result_type) 9802 << FnDecl->getDeclName() << ExpectedResultType; 9803 9804 // Check that the result type is what we expect. 9805 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9806 return SemaRef.Diag(FnDecl->getLocation(), 9807 diag::err_operator_new_delete_invalid_result_type) 9808 << FnDecl->getDeclName() << ExpectedResultType; 9809 9810 // A function template must have at least 2 parameters. 9811 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9812 return SemaRef.Diag(FnDecl->getLocation(), 9813 diag::err_operator_new_delete_template_too_few_parameters) 9814 << FnDecl->getDeclName(); 9815 9816 // The function decl must have at least 1 parameter. 9817 if (FnDecl->getNumParams() == 0) 9818 return SemaRef.Diag(FnDecl->getLocation(), 9819 diag::err_operator_new_delete_too_few_parameters) 9820 << FnDecl->getDeclName(); 9821 9822 // Check the first parameter type is not dependent. 9823 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9824 if (FirstParamType->isDependentType()) 9825 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9826 << FnDecl->getDeclName() << ExpectedFirstParamType; 9827 9828 // Check that the first parameter type is what we expect. 9829 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9830 ExpectedFirstParamType) 9831 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9832 << FnDecl->getDeclName() << ExpectedFirstParamType; 9833 9834 return false; 9835 } 9836 9837 static bool 9838 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9839 // C++ [basic.stc.dynamic.allocation]p1: 9840 // A program is ill-formed if an allocation function is declared in a 9841 // namespace scope other than global scope or declared static in global 9842 // scope. 9843 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9844 return true; 9845 9846 CanQualType SizeTy = 9847 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9848 9849 // C++ [basic.stc.dynamic.allocation]p1: 9850 // The return type shall be void*. The first parameter shall have type 9851 // std::size_t. 9852 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9853 SizeTy, 9854 diag::err_operator_new_dependent_param_type, 9855 diag::err_operator_new_param_type)) 9856 return true; 9857 9858 // C++ [basic.stc.dynamic.allocation]p1: 9859 // The first parameter shall not have an associated default argument. 9860 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9861 return SemaRef.Diag(FnDecl->getLocation(), 9862 diag::err_operator_new_default_arg) 9863 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9864 9865 return false; 9866 } 9867 9868 static bool 9869 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9870 // C++ [basic.stc.dynamic.deallocation]p1: 9871 // A program is ill-formed if deallocation functions are declared in a 9872 // namespace scope other than global scope or declared static in global 9873 // scope. 9874 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9875 return true; 9876 9877 // C++ [basic.stc.dynamic.deallocation]p2: 9878 // Each deallocation function shall return void and its first parameter 9879 // shall be void*. 9880 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9881 SemaRef.Context.VoidPtrTy, 9882 diag::err_operator_delete_dependent_param_type, 9883 diag::err_operator_delete_param_type)) 9884 return true; 9885 9886 return false; 9887 } 9888 9889 /// CheckOverloadedOperatorDeclaration - Check whether the declaration 9890 /// of this overloaded operator is well-formed. If so, returns false; 9891 /// otherwise, emits appropriate diagnostics and returns true. 9892 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9893 assert(FnDecl && FnDecl->isOverloadedOperator() && 9894 "Expected an overloaded operator declaration"); 9895 9896 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9897 9898 // C++ [over.oper]p5: 9899 // The allocation and deallocation functions, operator new, 9900 // operator new[], operator delete and operator delete[], are 9901 // described completely in 3.7.3. The attributes and restrictions 9902 // found in the rest of this subclause do not apply to them unless 9903 // explicitly stated in 3.7.3. 9904 if (Op == OO_Delete || Op == OO_Array_Delete) 9905 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9906 9907 if (Op == OO_New || Op == OO_Array_New) 9908 return CheckOperatorNewDeclaration(*this, FnDecl); 9909 9910 // C++ [over.oper]p6: 9911 // An operator function shall either be a non-static member 9912 // function or be a non-member function and have at least one 9913 // parameter whose type is a class, a reference to a class, an 9914 // enumeration, or a reference to an enumeration. 9915 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9916 if (MethodDecl->isStatic()) 9917 return Diag(FnDecl->getLocation(), 9918 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9919 } else { 9920 bool ClassOrEnumParam = false; 9921 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9922 ParamEnd = FnDecl->param_end(); 9923 Param != ParamEnd; ++Param) { 9924 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9925 if (ParamType->isDependentType() || ParamType->isRecordType() || 9926 ParamType->isEnumeralType()) { 9927 ClassOrEnumParam = true; 9928 break; 9929 } 9930 } 9931 9932 if (!ClassOrEnumParam) 9933 return Diag(FnDecl->getLocation(), 9934 diag::err_operator_overload_needs_class_or_enum) 9935 << FnDecl->getDeclName(); 9936 } 9937 9938 // C++ [over.oper]p8: 9939 // An operator function cannot have default arguments (8.3.6), 9940 // except where explicitly stated below. 9941 // 9942 // Only the function-call operator allows default arguments 9943 // (C++ [over.call]p1). 9944 if (Op != OO_Call) { 9945 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9946 Param != FnDecl->param_end(); ++Param) { 9947 if ((*Param)->hasDefaultArg()) 9948 return Diag((*Param)->getLocation(), 9949 diag::err_operator_overload_default_arg) 9950 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9951 } 9952 } 9953 9954 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9955 { false, false, false } 9956 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9957 , { Unary, Binary, MemberOnly } 9958 #include "clang/Basic/OperatorKinds.def" 9959 }; 9960 9961 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9962 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9963 bool MustBeMemberOperator = OperatorUses[Op][2]; 9964 9965 // C++ [over.oper]p8: 9966 // [...] Operator functions cannot have more or fewer parameters 9967 // than the number required for the corresponding operator, as 9968 // described in the rest of this subclause. 9969 unsigned NumParams = FnDecl->getNumParams() 9970 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9971 if (Op != OO_Call && 9972 ((NumParams == 1 && !CanBeUnaryOperator) || 9973 (NumParams == 2 && !CanBeBinaryOperator) || 9974 (NumParams < 1) || (NumParams > 2))) { 9975 // We have the wrong number of parameters. 9976 unsigned ErrorKind; 9977 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9978 ErrorKind = 2; // 2 -> unary or binary. 9979 } else if (CanBeUnaryOperator) { 9980 ErrorKind = 0; // 0 -> unary 9981 } else { 9982 assert(CanBeBinaryOperator && 9983 "All non-call overloaded operators are unary or binary!"); 9984 ErrorKind = 1; // 1 -> binary 9985 } 9986 9987 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9988 << FnDecl->getDeclName() << NumParams << ErrorKind; 9989 } 9990 9991 // Overloaded operators other than operator() cannot be variadic. 9992 if (Op != OO_Call && 9993 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9994 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9995 << FnDecl->getDeclName(); 9996 } 9997 9998 // Some operators must be non-static member functions. 9999 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10000 return Diag(FnDecl->getLocation(), 10001 diag::err_operator_overload_must_be_member) 10002 << FnDecl->getDeclName(); 10003 } 10004 10005 // C++ [over.inc]p1: 10006 // The user-defined function called operator++ implements the 10007 // prefix and postfix ++ operator. If this function is a member 10008 // function with no parameters, or a non-member function with one 10009 // parameter of class or enumeration type, it defines the prefix 10010 // increment operator ++ for objects of that type. If the function 10011 // is a member function with one parameter (which shall be of type 10012 // int) or a non-member function with two parameters (the second 10013 // of which shall be of type int), it defines the postfix 10014 // increment operator ++ for objects of that type. 10015 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10016 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10017 bool ParamIsInt = false; 10018 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10019 ParamIsInt = BT->getKind() == BuiltinType::Int; 10020 10021 if (!ParamIsInt) 10022 return Diag(LastParam->getLocation(), 10023 diag::err_operator_overload_post_incdec_must_be_int) 10024 << LastParam->getType() << (Op == OO_MinusMinus); 10025 } 10026 10027 return false; 10028 } 10029 10030 /// CheckLiteralOperatorDeclaration - Check whether the declaration 10031 /// of this literal operator function is well-formed. If so, returns 10032 /// false; otherwise, emits appropriate diagnostics and returns true. 10033 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10034 if (isa<CXXMethodDecl>(FnDecl)) { 10035 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10036 << FnDecl->getDeclName(); 10037 return true; 10038 } 10039 10040 if (FnDecl->isExternC()) { 10041 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10042 return true; 10043 } 10044 10045 bool Valid = false; 10046 10047 // This might be the definition of a literal operator template. 10048 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10049 // This might be a specialization of a literal operator template. 10050 if (!TpDecl) 10051 TpDecl = FnDecl->getPrimaryTemplate(); 10052 10053 // template <char...> type operator "" name() is the only valid template 10054 // signature, and the only valid signature with no parameters. 10055 if (TpDecl) { 10056 if (FnDecl->param_size() == 0) { 10057 // Must have only one template parameter 10058 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10059 if (Params->size() == 1) { 10060 NonTypeTemplateParmDecl *PmDecl = 10061 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10062 10063 // The template parameter must be a char parameter pack. 10064 if (PmDecl && PmDecl->isTemplateParameterPack() && 10065 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10066 Valid = true; 10067 } 10068 } 10069 } else if (FnDecl->param_size()) { 10070 // Check the first parameter 10071 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10072 10073 QualType T = (*Param)->getType().getUnqualifiedType(); 10074 10075 // unsigned long long int, long double, and any character type are allowed 10076 // as the only parameters. 10077 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10078 Context.hasSameType(T, Context.LongDoubleTy) || 10079 Context.hasSameType(T, Context.CharTy) || 10080 Context.hasSameType(T, Context.WCharTy) || 10081 Context.hasSameType(T, Context.Char16Ty) || 10082 Context.hasSameType(T, Context.Char32Ty)) { 10083 if (++Param == FnDecl->param_end()) 10084 Valid = true; 10085 goto FinishedParams; 10086 } 10087 10088 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10089 const PointerType *PT = T->getAs<PointerType>(); 10090 if (!PT) 10091 goto FinishedParams; 10092 T = PT->getPointeeType(); 10093 if (!T.isConstQualified() || T.isVolatileQualified()) 10094 goto FinishedParams; 10095 T = T.getUnqualifiedType(); 10096 10097 // Move on to the second parameter; 10098 ++Param; 10099 10100 // If there is no second parameter, the first must be a const char * 10101 if (Param == FnDecl->param_end()) { 10102 if (Context.hasSameType(T, Context.CharTy)) 10103 Valid = true; 10104 goto FinishedParams; 10105 } 10106 10107 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10108 // are allowed as the first parameter to a two-parameter function 10109 if (!(Context.hasSameType(T, Context.CharTy) || 10110 Context.hasSameType(T, Context.WCharTy) || 10111 Context.hasSameType(T, Context.Char16Ty) || 10112 Context.hasSameType(T, Context.Char32Ty))) 10113 goto FinishedParams; 10114 10115 // The second and final parameter must be an std::size_t 10116 T = (*Param)->getType().getUnqualifiedType(); 10117 if (Context.hasSameType(T, Context.getSizeType()) && 10118 ++Param == FnDecl->param_end()) 10119 Valid = true; 10120 } 10121 10122 // FIXME: This diagnostic is absolutely terrible. 10123 FinishedParams: 10124 if (!Valid) { 10125 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10126 << FnDecl->getDeclName(); 10127 return true; 10128 } 10129 10130 // A parameter-declaration-clause containing a default argument is not 10131 // equivalent to any of the permitted forms. 10132 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10133 ParamEnd = FnDecl->param_end(); 10134 Param != ParamEnd; ++Param) { 10135 if ((*Param)->hasDefaultArg()) { 10136 Diag((*Param)->getDefaultArgRange().getBegin(), 10137 diag::err_literal_operator_default_argument) 10138 << (*Param)->getDefaultArgRange(); 10139 break; 10140 } 10141 } 10142 10143 StringRef LiteralName 10144 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10145 if (LiteralName[0] != '_') { 10146 // C++11 [usrlit.suffix]p1: 10147 // Literal suffix identifiers that do not start with an underscore 10148 // are reserved for future standardization. 10149 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10150 } 10151 10152 return false; 10153 } 10154 10155 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10156 /// linkage specification, including the language and (if present) 10157 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10158 /// the location of the language string literal, which is provided 10159 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10160 /// the '{' brace. Otherwise, this linkage specification does not 10161 /// have any braces. 10162 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10163 SourceLocation LangLoc, 10164 StringRef Lang, 10165 SourceLocation LBraceLoc) { 10166 LinkageSpecDecl::LanguageIDs Language; 10167 if (Lang == "\"C\"") 10168 Language = LinkageSpecDecl::lang_c; 10169 else if (Lang == "\"C++\"") 10170 Language = LinkageSpecDecl::lang_cxx; 10171 else { 10172 Diag(LangLoc, diag::err_bad_language); 10173 return 0; 10174 } 10175 10176 // FIXME: Add all the various semantics of linkage specifications 10177 10178 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10179 ExternLoc, LangLoc, Language); 10180 CurContext->addDecl(D); 10181 PushDeclContext(S, D); 10182 return D; 10183 } 10184 10185 /// ActOnFinishLinkageSpecification - Complete the definition of 10186 /// the C++ linkage specification LinkageSpec. If RBraceLoc is 10187 /// valid, it's the position of the closing '}' brace in a linkage 10188 /// specification that uses braces. 10189 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10190 Decl *LinkageSpec, 10191 SourceLocation RBraceLoc) { 10192 if (LinkageSpec) { 10193 if (RBraceLoc.isValid()) { 10194 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10195 LSDecl->setRBraceLoc(RBraceLoc); 10196 } 10197 PopDeclContext(); 10198 } 10199 return LinkageSpec; 10200 } 10201 10202 Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10203 AttributeList *AttrList, 10204 SourceLocation SemiLoc) { 10205 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10206 // Attribute declarations appertain to empty declaration so we handle 10207 // them here. 10208 if (AttrList) 10209 ProcessDeclAttributeList(S, ED, AttrList); 10210 10211 CurContext->addDecl(ED); 10212 return ED; 10213 } 10214 10215 /// \brief Perform semantic analysis for the variable declaration that 10216 /// occurs within a C++ catch clause, returning the newly-created 10217 /// variable. 10218 VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10219 TypeSourceInfo *TInfo, 10220 SourceLocation StartLoc, 10221 SourceLocation Loc, 10222 IdentifierInfo *Name) { 10223 bool Invalid = false; 10224 QualType ExDeclType = TInfo->getType(); 10225 10226 // Arrays and functions decay. 10227 if (ExDeclType->isArrayType()) 10228 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10229 else if (ExDeclType->isFunctionType()) 10230 ExDeclType = Context.getPointerType(ExDeclType); 10231 10232 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10233 // The exception-declaration shall not denote a pointer or reference to an 10234 // incomplete type, other than [cv] void*. 10235 // N2844 forbids rvalue references. 10236 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10237 Diag(Loc, diag::err_catch_rvalue_ref); 10238 Invalid = true; 10239 } 10240 10241 QualType BaseType = ExDeclType; 10242 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10243 unsigned DK = diag::err_catch_incomplete; 10244 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10245 BaseType = Ptr->getPointeeType(); 10246 Mode = 1; 10247 DK = diag::err_catch_incomplete_ptr; 10248 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10249 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10250 BaseType = Ref->getPointeeType(); 10251 Mode = 2; 10252 DK = diag::err_catch_incomplete_ref; 10253 } 10254 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10255 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10256 Invalid = true; 10257 10258 if (!Invalid && !ExDeclType->isDependentType() && 10259 RequireNonAbstractType(Loc, ExDeclType, 10260 diag::err_abstract_type_in_decl, 10261 AbstractVariableType)) 10262 Invalid = true; 10263 10264 // Only the non-fragile NeXT runtime currently supports C++ catches 10265 // of ObjC types, and no runtime supports catching ObjC types by value. 10266 if (!Invalid && getLangOpts().ObjC1) { 10267 QualType T = ExDeclType; 10268 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10269 T = RT->getPointeeType(); 10270 10271 if (T->isObjCObjectType()) { 10272 Diag(Loc, diag::err_objc_object_catch); 10273 Invalid = true; 10274 } else if (T->isObjCObjectPointerType()) { 10275 // FIXME: should this be a test for macosx-fragile specifically? 10276 if (getLangOpts().ObjCRuntime.isFragile()) 10277 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10278 } 10279 } 10280 10281 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10282 ExDeclType, TInfo, SC_None, SC_None); 10283 ExDecl->setExceptionVariable(true); 10284 10285 // In ARC, infer 'retaining' for variables of retainable type. 10286 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10287 Invalid = true; 10288 10289 if (!Invalid && !ExDeclType->isDependentType()) { 10290 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10291 // C++ [except.handle]p16: 10292 // The object declared in an exception-declaration or, if the 10293 // exception-declaration does not specify a name, a temporary (12.2) is 10294 // copy-initialized (8.5) from the exception object. [...] 10295 // The object is destroyed when the handler exits, after the destruction 10296 // of any automatic objects initialized within the handler. 10297 // 10298 // We just pretend to initialize the object with itself, then make sure 10299 // it can be destroyed later. 10300 QualType initType = ExDeclType; 10301 10302 InitializedEntity entity = 10303 InitializedEntity::InitializeVariable(ExDecl); 10304 InitializationKind initKind = 10305 InitializationKind::CreateCopy(Loc, SourceLocation()); 10306 10307 Expr *opaqueValue = 10308 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10309 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10310 ExprResult result = sequence.Perform(*this, entity, initKind, 10311 MultiExprArg(&opaqueValue, 1)); 10312 if (result.isInvalid()) 10313 Invalid = true; 10314 else { 10315 // If the constructor used was non-trivial, set this as the 10316 // "initializer". 10317 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10318 if (!construct->getConstructor()->isTrivial()) { 10319 Expr *init = MaybeCreateExprWithCleanups(construct); 10320 ExDecl->setInit(init); 10321 } 10322 10323 // And make sure it's destructable. 10324 FinalizeVarWithDestructor(ExDecl, recordType); 10325 } 10326 } 10327 } 10328 10329 if (Invalid) 10330 ExDecl->setInvalidDecl(); 10331 10332 return ExDecl; 10333 } 10334 10335 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10336 /// handler. 10337 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10338 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10339 bool Invalid = D.isInvalidType(); 10340 10341 // Check for unexpanded parameter packs. 10342 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10343 UPPC_ExceptionType)) { 10344 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10345 D.getIdentifierLoc()); 10346 Invalid = true; 10347 } 10348 10349 IdentifierInfo *II = D.getIdentifier(); 10350 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10351 LookupOrdinaryName, 10352 ForRedeclaration)) { 10353 // The scope should be freshly made just for us. There is just no way 10354 // it contains any previous declaration. 10355 assert(!S->isDeclScope(PrevDecl)); 10356 if (PrevDecl->isTemplateParameter()) { 10357 // Maybe we will complain about the shadowed template parameter. 10358 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10359 PrevDecl = 0; 10360 } 10361 } 10362 10363 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10364 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10365 << D.getCXXScopeSpec().getRange(); 10366 Invalid = true; 10367 } 10368 10369 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10370 D.getLocStart(), 10371 D.getIdentifierLoc(), 10372 D.getIdentifier()); 10373 if (Invalid) 10374 ExDecl->setInvalidDecl(); 10375 10376 // Add the exception declaration into this scope. 10377 if (II) 10378 PushOnScopeChains(ExDecl, S); 10379 else 10380 CurContext->addDecl(ExDecl); 10381 10382 ProcessDeclAttributes(S, ExDecl, D); 10383 return ExDecl; 10384 } 10385 10386 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10387 Expr *AssertExpr, 10388 Expr *AssertMessageExpr, 10389 SourceLocation RParenLoc) { 10390 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10391 10392 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10393 return 0; 10394 10395 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10396 AssertMessage, RParenLoc, false); 10397 } 10398 10399 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10400 Expr *AssertExpr, 10401 StringLiteral *AssertMessage, 10402 SourceLocation RParenLoc, 10403 bool Failed) { 10404 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10405 !Failed) { 10406 // In a static_assert-declaration, the constant-expression shall be a 10407 // constant expression that can be contextually converted to bool. 10408 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10409 if (Converted.isInvalid()) 10410 Failed = true; 10411 10412 llvm::APSInt Cond; 10413 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10414 diag::err_static_assert_expression_is_not_constant, 10415 /*AllowFold=*/false).isInvalid()) 10416 Failed = true; 10417 10418 if (!Failed && !Cond) { 10419 SmallString<256> MsgBuffer; 10420 llvm::raw_svector_ostream Msg(MsgBuffer); 10421 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10422 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10423 << Msg.str() << AssertExpr->getSourceRange(); 10424 Failed = true; 10425 } 10426 } 10427 10428 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10429 AssertExpr, AssertMessage, RParenLoc, 10430 Failed); 10431 10432 CurContext->addDecl(Decl); 10433 return Decl; 10434 } 10435 10436 /// \brief Perform semantic analysis of the given friend type declaration. 10437 /// 10438 /// \returns A friend declaration that. 10439 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10440 SourceLocation FriendLoc, 10441 TypeSourceInfo *TSInfo) { 10442 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10443 10444 QualType T = TSInfo->getType(); 10445 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10446 10447 // C++03 [class.friend]p2: 10448 // An elaborated-type-specifier shall be used in a friend declaration 10449 // for a class.* 10450 // 10451 // * The class-key of the elaborated-type-specifier is required. 10452 if (!ActiveTemplateInstantiations.empty()) { 10453 // Do not complain about the form of friend template types during 10454 // template instantiation; we will already have complained when the 10455 // template was declared. 10456 } else { 10457 if (!T->isElaboratedTypeSpecifier()) { 10458 // If we evaluated the type to a record type, suggest putting 10459 // a tag in front. 10460 if (const RecordType *RT = T->getAs<RecordType>()) { 10461 RecordDecl *RD = RT->getDecl(); 10462 10463 std::string InsertionText = std::string(" ") + RD->getKindName(); 10464 10465 Diag(TypeRange.getBegin(), 10466 getLangOpts().CPlusPlus11 ? 10467 diag::warn_cxx98_compat_unelaborated_friend_type : 10468 diag::ext_unelaborated_friend_type) 10469 << (unsigned) RD->getTagKind() 10470 << T 10471 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10472 InsertionText); 10473 } else { 10474 Diag(FriendLoc, 10475 getLangOpts().CPlusPlus11 ? 10476 diag::warn_cxx98_compat_nonclass_type_friend : 10477 diag::ext_nonclass_type_friend) 10478 << T 10479 << TypeRange; 10480 } 10481 } else if (T->getAs<EnumType>()) { 10482 Diag(FriendLoc, 10483 getLangOpts().CPlusPlus11 ? 10484 diag::warn_cxx98_compat_enum_friend : 10485 diag::ext_enum_friend) 10486 << T 10487 << TypeRange; 10488 } 10489 10490 // C++11 [class.friend]p3: 10491 // A friend declaration that does not declare a function shall have one 10492 // of the following forms: 10493 // friend elaborated-type-specifier ; 10494 // friend simple-type-specifier ; 10495 // friend typename-specifier ; 10496 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10497 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10498 } 10499 10500 // If the type specifier in a friend declaration designates a (possibly 10501 // cv-qualified) class type, that class is declared as a friend; otherwise, 10502 // the friend declaration is ignored. 10503 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10504 } 10505 10506 /// Handle a friend tag declaration where the scope specifier was 10507 /// templated. 10508 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10509 unsigned TagSpec, SourceLocation TagLoc, 10510 CXXScopeSpec &SS, 10511 IdentifierInfo *Name, 10512 SourceLocation NameLoc, 10513 AttributeList *Attr, 10514 MultiTemplateParamsArg TempParamLists) { 10515 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10516 10517 bool isExplicitSpecialization = false; 10518 bool Invalid = false; 10519 10520 if (TemplateParameterList *TemplateParams 10521 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10522 TempParamLists.data(), 10523 TempParamLists.size(), 10524 /*friend*/ true, 10525 isExplicitSpecialization, 10526 Invalid)) { 10527 if (TemplateParams->size() > 0) { 10528 // This is a declaration of a class template. 10529 if (Invalid) 10530 return 0; 10531 10532 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10533 SS, Name, NameLoc, Attr, 10534 TemplateParams, AS_public, 10535 /*ModulePrivateLoc=*/SourceLocation(), 10536 TempParamLists.size() - 1, 10537 TempParamLists.data()).take(); 10538 } else { 10539 // The "template<>" header is extraneous. 10540 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10541 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10542 isExplicitSpecialization = true; 10543 } 10544 } 10545 10546 if (Invalid) return 0; 10547 10548 bool isAllExplicitSpecializations = true; 10549 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10550 if (TempParamLists[I]->size()) { 10551 isAllExplicitSpecializations = false; 10552 break; 10553 } 10554 } 10555 10556 // FIXME: don't ignore attributes. 10557 10558 // If it's explicit specializations all the way down, just forget 10559 // about the template header and build an appropriate non-templated 10560 // friend. TODO: for source fidelity, remember the headers. 10561 if (isAllExplicitSpecializations) { 10562 if (SS.isEmpty()) { 10563 bool Owned = false; 10564 bool IsDependent = false; 10565 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10566 Attr, AS_public, 10567 /*ModulePrivateLoc=*/SourceLocation(), 10568 MultiTemplateParamsArg(), Owned, IsDependent, 10569 /*ScopedEnumKWLoc=*/SourceLocation(), 10570 /*ScopedEnumUsesClassTag=*/false, 10571 /*UnderlyingType=*/TypeResult()); 10572 } 10573 10574 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10575 ElaboratedTypeKeyword Keyword 10576 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10577 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10578 *Name, NameLoc); 10579 if (T.isNull()) 10580 return 0; 10581 10582 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10583 if (isa<DependentNameType>(T)) { 10584 DependentNameTypeLoc TL = 10585 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10586 TL.setElaboratedKeywordLoc(TagLoc); 10587 TL.setQualifierLoc(QualifierLoc); 10588 TL.setNameLoc(NameLoc); 10589 } else { 10590 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 10591 TL.setElaboratedKeywordLoc(TagLoc); 10592 TL.setQualifierLoc(QualifierLoc); 10593 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 10594 } 10595 10596 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10597 TSI, FriendLoc, TempParamLists); 10598 Friend->setAccess(AS_public); 10599 CurContext->addDecl(Friend); 10600 return Friend; 10601 } 10602 10603 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10604 10605 10606 10607 // Handle the case of a templated-scope friend class. e.g. 10608 // template <class T> class A<T>::B; 10609 // FIXME: we don't support these right now. 10610 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10611 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10612 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10613 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10614 TL.setElaboratedKeywordLoc(TagLoc); 10615 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10616 TL.setNameLoc(NameLoc); 10617 10618 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10619 TSI, FriendLoc, TempParamLists); 10620 Friend->setAccess(AS_public); 10621 Friend->setUnsupportedFriend(true); 10622 CurContext->addDecl(Friend); 10623 return Friend; 10624 } 10625 10626 10627 /// Handle a friend type declaration. This works in tandem with 10628 /// ActOnTag. 10629 /// 10630 /// Notes on friend class templates: 10631 /// 10632 /// We generally treat friend class declarations as if they were 10633 /// declaring a class. So, for example, the elaborated type specifier 10634 /// in a friend declaration is required to obey the restrictions of a 10635 /// class-head (i.e. no typedefs in the scope chain), template 10636 /// parameters are required to match up with simple template-ids, &c. 10637 /// However, unlike when declaring a template specialization, it's 10638 /// okay to refer to a template specialization without an empty 10639 /// template parameter declaration, e.g. 10640 /// friend class A<T>::B<unsigned>; 10641 /// We permit this as a special case; if there are any template 10642 /// parameters present at all, require proper matching, i.e. 10643 /// template <> template \<class T> friend class A<int>::B; 10644 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10645 MultiTemplateParamsArg TempParams) { 10646 SourceLocation Loc = DS.getLocStart(); 10647 10648 assert(DS.isFriendSpecified()); 10649 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10650 10651 // Try to convert the decl specifier to a type. This works for 10652 // friend templates because ActOnTag never produces a ClassTemplateDecl 10653 // for a TUK_Friend. 10654 Declarator TheDeclarator(DS, Declarator::MemberContext); 10655 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10656 QualType T = TSI->getType(); 10657 if (TheDeclarator.isInvalidType()) 10658 return 0; 10659 10660 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10661 return 0; 10662 10663 // This is definitely an error in C++98. It's probably meant to 10664 // be forbidden in C++0x, too, but the specification is just 10665 // poorly written. 10666 // 10667 // The problem is with declarations like the following: 10668 // template <T> friend A<T>::foo; 10669 // where deciding whether a class C is a friend or not now hinges 10670 // on whether there exists an instantiation of A that causes 10671 // 'foo' to equal C. There are restrictions on class-heads 10672 // (which we declare (by fiat) elaborated friend declarations to 10673 // be) that makes this tractable. 10674 // 10675 // FIXME: handle "template <> friend class A<T>;", which 10676 // is possibly well-formed? Who even knows? 10677 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10678 Diag(Loc, diag::err_tagless_friend_type_template) 10679 << DS.getSourceRange(); 10680 return 0; 10681 } 10682 10683 // C++98 [class.friend]p1: A friend of a class is a function 10684 // or class that is not a member of the class . . . 10685 // This is fixed in DR77, which just barely didn't make the C++03 10686 // deadline. It's also a very silly restriction that seriously 10687 // affects inner classes and which nobody else seems to implement; 10688 // thus we never diagnose it, not even in -pedantic. 10689 // 10690 // But note that we could warn about it: it's always useless to 10691 // friend one of your own members (it's not, however, worthless to 10692 // friend a member of an arbitrary specialization of your template). 10693 10694 Decl *D; 10695 if (unsigned NumTempParamLists = TempParams.size()) 10696 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10697 NumTempParamLists, 10698 TempParams.data(), 10699 TSI, 10700 DS.getFriendSpecLoc()); 10701 else 10702 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10703 10704 if (!D) 10705 return 0; 10706 10707 D->setAccess(AS_public); 10708 CurContext->addDecl(D); 10709 10710 return D; 10711 } 10712 10713 NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10714 MultiTemplateParamsArg TemplateParams) { 10715 const DeclSpec &DS = D.getDeclSpec(); 10716 10717 assert(DS.isFriendSpecified()); 10718 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10719 10720 SourceLocation Loc = D.getIdentifierLoc(); 10721 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10722 10723 // C++ [class.friend]p1 10724 // A friend of a class is a function or class.... 10725 // Note that this sees through typedefs, which is intended. 10726 // It *doesn't* see through dependent types, which is correct 10727 // according to [temp.arg.type]p3: 10728 // If a declaration acquires a function type through a 10729 // type dependent on a template-parameter and this causes 10730 // a declaration that does not use the syntactic form of a 10731 // function declarator to have a function type, the program 10732 // is ill-formed. 10733 if (!TInfo->getType()->isFunctionType()) { 10734 Diag(Loc, diag::err_unexpected_friend); 10735 10736 // It might be worthwhile to try to recover by creating an 10737 // appropriate declaration. 10738 return 0; 10739 } 10740 10741 // C++ [namespace.memdef]p3 10742 // - If a friend declaration in a non-local class first declares a 10743 // class or function, the friend class or function is a member 10744 // of the innermost enclosing namespace. 10745 // - The name of the friend is not found by simple name lookup 10746 // until a matching declaration is provided in that namespace 10747 // scope (either before or after the class declaration granting 10748 // friendship). 10749 // - If a friend function is called, its name may be found by the 10750 // name lookup that considers functions from namespaces and 10751 // classes associated with the types of the function arguments. 10752 // - When looking for a prior declaration of a class or a function 10753 // declared as a friend, scopes outside the innermost enclosing 10754 // namespace scope are not considered. 10755 10756 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10757 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10758 DeclarationName Name = NameInfo.getName(); 10759 assert(Name); 10760 10761 // Check for unexpanded parameter packs. 10762 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10763 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10764 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10765 return 0; 10766 10767 // The context we found the declaration in, or in which we should 10768 // create the declaration. 10769 DeclContext *DC; 10770 Scope *DCScope = S; 10771 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10772 ForRedeclaration); 10773 10774 // FIXME: there are different rules in local classes 10775 10776 // There are four cases here. 10777 // - There's no scope specifier, in which case we just go to the 10778 // appropriate scope and look for a function or function template 10779 // there as appropriate. 10780 // Recover from invalid scope qualifiers as if they just weren't there. 10781 if (SS.isInvalid() || !SS.isSet()) { 10782 // C++0x [namespace.memdef]p3: 10783 // If the name in a friend declaration is neither qualified nor 10784 // a template-id and the declaration is a function or an 10785 // elaborated-type-specifier, the lookup to determine whether 10786 // the entity has been previously declared shall not consider 10787 // any scopes outside the innermost enclosing namespace. 10788 // C++0x [class.friend]p11: 10789 // If a friend declaration appears in a local class and the name 10790 // specified is an unqualified name, a prior declaration is 10791 // looked up without considering scopes that are outside the 10792 // innermost enclosing non-class scope. For a friend function 10793 // declaration, if there is no prior declaration, the program is 10794 // ill-formed. 10795 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10796 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10797 10798 // Find the appropriate context according to the above. 10799 DC = CurContext; 10800 while (true) { 10801 // Skip class contexts. If someone can cite chapter and verse 10802 // for this behavior, that would be nice --- it's what GCC and 10803 // EDG do, and it seems like a reasonable intent, but the spec 10804 // really only says that checks for unqualified existing 10805 // declarations should stop at the nearest enclosing namespace, 10806 // not that they should only consider the nearest enclosing 10807 // namespace. 10808 while (DC->isRecord() || DC->isTransparentContext()) 10809 DC = DC->getParent(); 10810 10811 LookupQualifiedName(Previous, DC); 10812 10813 // TODO: decide what we think about using declarations. 10814 if (isLocal || !Previous.empty()) 10815 break; 10816 10817 if (isTemplateId) { 10818 if (isa<TranslationUnitDecl>(DC)) break; 10819 } else { 10820 if (DC->isFileContext()) break; 10821 } 10822 DC = DC->getParent(); 10823 } 10824 10825 // C++ [class.friend]p1: A friend of a class is a function or 10826 // class that is not a member of the class . . . 10827 // C++11 changes this for both friend types and functions. 10828 // Most C++ 98 compilers do seem to give an error here, so 10829 // we do, too. 10830 if (!Previous.empty() && DC->Equals(CurContext)) 10831 Diag(DS.getFriendSpecLoc(), 10832 getLangOpts().CPlusPlus11 ? 10833 diag::warn_cxx98_compat_friend_is_member : 10834 diag::err_friend_is_member); 10835 10836 DCScope = getScopeForDeclContext(S, DC); 10837 10838 // C++ [class.friend]p6: 10839 // A function can be defined in a friend declaration of a class if and 10840 // only if the class is a non-local class (9.8), the function name is 10841 // unqualified, and the function has namespace scope. 10842 if (isLocal && D.isFunctionDefinition()) { 10843 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10844 } 10845 10846 // - There's a non-dependent scope specifier, in which case we 10847 // compute it and do a previous lookup there for a function 10848 // or function template. 10849 } else if (!SS.getScopeRep()->isDependent()) { 10850 DC = computeDeclContext(SS); 10851 if (!DC) return 0; 10852 10853 if (RequireCompleteDeclContext(SS, DC)) return 0; 10854 10855 LookupQualifiedName(Previous, DC); 10856 10857 // Ignore things found implicitly in the wrong scope. 10858 // TODO: better diagnostics for this case. Suggesting the right 10859 // qualified scope would be nice... 10860 LookupResult::Filter F = Previous.makeFilter(); 10861 while (F.hasNext()) { 10862 NamedDecl *D = F.next(); 10863 if (!DC->InEnclosingNamespaceSetOf( 10864 D->getDeclContext()->getRedeclContext())) 10865 F.erase(); 10866 } 10867 F.done(); 10868 10869 if (Previous.empty()) { 10870 D.setInvalidType(); 10871 Diag(Loc, diag::err_qualified_friend_not_found) 10872 << Name << TInfo->getType(); 10873 return 0; 10874 } 10875 10876 // C++ [class.friend]p1: A friend of a class is a function or 10877 // class that is not a member of the class . . . 10878 if (DC->Equals(CurContext)) 10879 Diag(DS.getFriendSpecLoc(), 10880 getLangOpts().CPlusPlus11 ? 10881 diag::warn_cxx98_compat_friend_is_member : 10882 diag::err_friend_is_member); 10883 10884 if (D.isFunctionDefinition()) { 10885 // C++ [class.friend]p6: 10886 // A function can be defined in a friend declaration of a class if and 10887 // only if the class is a non-local class (9.8), the function name is 10888 // unqualified, and the function has namespace scope. 10889 SemaDiagnosticBuilder DB 10890 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10891 10892 DB << SS.getScopeRep(); 10893 if (DC->isFileContext()) 10894 DB << FixItHint::CreateRemoval(SS.getRange()); 10895 SS.clear(); 10896 } 10897 10898 // - There's a scope specifier that does not match any template 10899 // parameter lists, in which case we use some arbitrary context, 10900 // create a method or method template, and wait for instantiation. 10901 // - There's a scope specifier that does match some template 10902 // parameter lists, which we don't handle right now. 10903 } else { 10904 if (D.isFunctionDefinition()) { 10905 // C++ [class.friend]p6: 10906 // A function can be defined in a friend declaration of a class if and 10907 // only if the class is a non-local class (9.8), the function name is 10908 // unqualified, and the function has namespace scope. 10909 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10910 << SS.getScopeRep(); 10911 } 10912 10913 DC = CurContext; 10914 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10915 } 10916 10917 if (!DC->isRecord()) { 10918 // This implies that it has to be an operator or function. 10919 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10920 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10921 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10922 Diag(Loc, diag::err_introducing_special_friend) << 10923 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10924 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10925 return 0; 10926 } 10927 } 10928 10929 // FIXME: This is an egregious hack to cope with cases where the scope stack 10930 // does not contain the declaration context, i.e., in an out-of-line 10931 // definition of a class. 10932 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10933 if (!DCScope) { 10934 FakeDCScope.setEntity(DC); 10935 DCScope = &FakeDCScope; 10936 } 10937 10938 bool AddToScope = true; 10939 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10940 TemplateParams, AddToScope); 10941 if (!ND) return 0; 10942 10943 assert(ND->getDeclContext() == DC); 10944 assert(ND->getLexicalDeclContext() == CurContext); 10945 10946 // Add the function declaration to the appropriate lookup tables, 10947 // adjusting the redeclarations list as necessary. We don't 10948 // want to do this yet if the friending class is dependent. 10949 // 10950 // Also update the scope-based lookup if the target context's 10951 // lookup context is in lexical scope. 10952 if (!CurContext->isDependentContext()) { 10953 DC = DC->getRedeclContext(); 10954 DC->makeDeclVisibleInContext(ND); 10955 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10956 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10957 } 10958 10959 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10960 D.getIdentifierLoc(), ND, 10961 DS.getFriendSpecLoc()); 10962 FrD->setAccess(AS_public); 10963 CurContext->addDecl(FrD); 10964 10965 if (ND->isInvalidDecl()) { 10966 FrD->setInvalidDecl(); 10967 } else { 10968 if (DC->isRecord()) CheckFriendAccess(ND); 10969 10970 FunctionDecl *FD; 10971 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10972 FD = FTD->getTemplatedDecl(); 10973 else 10974 FD = cast<FunctionDecl>(ND); 10975 10976 // Mark templated-scope function declarations as unsupported. 10977 if (FD->getNumTemplateParameterLists()) 10978 FrD->setUnsupportedFriend(true); 10979 } 10980 10981 return ND; 10982 } 10983 10984 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10985 AdjustDeclIfTemplate(Dcl); 10986 10987 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 10988 if (!Fn) { 10989 Diag(DelLoc, diag::err_deleted_non_function); 10990 return; 10991 } 10992 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10993 // Don't consider the implicit declaration we generate for explicit 10994 // specializations. FIXME: Do not generate these implicit declarations. 10995 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10996 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10997 Diag(DelLoc, diag::err_deleted_decl_not_first); 10998 Diag(Prev->getLocation(), diag::note_previous_declaration); 10999 } 11000 // If the declaration wasn't the first, we delete the function anyway for 11001 // recovery. 11002 } 11003 Fn->setDeletedAsWritten(); 11004 } 11005 11006 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11007 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11008 11009 if (MD) { 11010 if (MD->getParent()->isDependentType()) { 11011 MD->setDefaulted(); 11012 MD->setExplicitlyDefaulted(); 11013 return; 11014 } 11015 11016 CXXSpecialMember Member = getSpecialMember(MD); 11017 if (Member == CXXInvalid) { 11018 Diag(DefaultLoc, diag::err_default_special_members); 11019 return; 11020 } 11021 11022 MD->setDefaulted(); 11023 MD->setExplicitlyDefaulted(); 11024 11025 // If this definition appears within the record, do the checking when 11026 // the record is complete. 11027 const FunctionDecl *Primary = MD; 11028 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11029 // Find the uninstantiated declaration that actually had the '= default' 11030 // on it. 11031 Pattern->isDefined(Primary); 11032 11033 if (Primary == Primary->getCanonicalDecl()) 11034 return; 11035 11036 CheckExplicitlyDefaultedSpecialMember(MD); 11037 11038 // The exception specification is needed because we are defining the 11039 // function. 11040 ResolveExceptionSpec(DefaultLoc, 11041 MD->getType()->castAs<FunctionProtoType>()); 11042 11043 switch (Member) { 11044 case CXXDefaultConstructor: { 11045 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11046 if (!CD->isInvalidDecl()) 11047 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11048 break; 11049 } 11050 11051 case CXXCopyConstructor: { 11052 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11053 if (!CD->isInvalidDecl()) 11054 DefineImplicitCopyConstructor(DefaultLoc, CD); 11055 break; 11056 } 11057 11058 case CXXCopyAssignment: { 11059 if (!MD->isInvalidDecl()) 11060 DefineImplicitCopyAssignment(DefaultLoc, MD); 11061 break; 11062 } 11063 11064 case CXXDestructor: { 11065 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11066 if (!DD->isInvalidDecl()) 11067 DefineImplicitDestructor(DefaultLoc, DD); 11068 break; 11069 } 11070 11071 case CXXMoveConstructor: { 11072 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11073 if (!CD->isInvalidDecl()) 11074 DefineImplicitMoveConstructor(DefaultLoc, CD); 11075 break; 11076 } 11077 11078 case CXXMoveAssignment: { 11079 if (!MD->isInvalidDecl()) 11080 DefineImplicitMoveAssignment(DefaultLoc, MD); 11081 break; 11082 } 11083 11084 case CXXInvalid: 11085 llvm_unreachable("Invalid special member."); 11086 } 11087 } else { 11088 Diag(DefaultLoc, diag::err_default_special_members); 11089 } 11090 } 11091 11092 static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11093 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11094 Stmt *SubStmt = *CI; 11095 if (!SubStmt) 11096 continue; 11097 if (isa<ReturnStmt>(SubStmt)) 11098 Self.Diag(SubStmt->getLocStart(), 11099 diag::err_return_in_constructor_handler); 11100 if (!isa<Expr>(SubStmt)) 11101 SearchForReturnInStmt(Self, SubStmt); 11102 } 11103 } 11104 11105 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11106 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11107 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11108 SearchForReturnInStmt(*this, Handler); 11109 } 11110 } 11111 11112 bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11113 const CXXMethodDecl *Old) { 11114 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11115 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11116 11117 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11118 11119 // If the calling conventions match, everything is fine 11120 if (NewCC == OldCC) 11121 return false; 11122 11123 // If either of the calling conventions are set to "default", we need to pick 11124 // something more sensible based on the target. This supports code where the 11125 // one method explicitly sets thiscall, and another has no explicit calling 11126 // convention. 11127 CallingConv Default = 11128 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11129 if (NewCC == CC_Default) 11130 NewCC = Default; 11131 if (OldCC == CC_Default) 11132 OldCC = Default; 11133 11134 // If the calling conventions still don't match, then report the error 11135 if (NewCC != OldCC) { 11136 Diag(New->getLocation(), 11137 diag::err_conflicting_overriding_cc_attributes) 11138 << New->getDeclName() << New->getType() << Old->getType(); 11139 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11140 return true; 11141 } 11142 11143 return false; 11144 } 11145 11146 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11147 const CXXMethodDecl *Old) { 11148 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11149 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11150 11151 if (Context.hasSameType(NewTy, OldTy) || 11152 NewTy->isDependentType() || OldTy->isDependentType()) 11153 return false; 11154 11155 // Check if the return types are covariant 11156 QualType NewClassTy, OldClassTy; 11157 11158 /// Both types must be pointers or references to classes. 11159 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11160 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11161 NewClassTy = NewPT->getPointeeType(); 11162 OldClassTy = OldPT->getPointeeType(); 11163 } 11164 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11165 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11166 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11167 NewClassTy = NewRT->getPointeeType(); 11168 OldClassTy = OldRT->getPointeeType(); 11169 } 11170 } 11171 } 11172 11173 // The return types aren't either both pointers or references to a class type. 11174 if (NewClassTy.isNull()) { 11175 Diag(New->getLocation(), 11176 diag::err_different_return_type_for_overriding_virtual_function) 11177 << New->getDeclName() << NewTy << OldTy; 11178 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11179 11180 return true; 11181 } 11182 11183 // C++ [class.virtual]p6: 11184 // If the return type of D::f differs from the return type of B::f, the 11185 // class type in the return type of D::f shall be complete at the point of 11186 // declaration of D::f or shall be the class type D. 11187 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11188 if (!RT->isBeingDefined() && 11189 RequireCompleteType(New->getLocation(), NewClassTy, 11190 diag::err_covariant_return_incomplete, 11191 New->getDeclName())) 11192 return true; 11193 } 11194 11195 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11196 // Check if the new class derives from the old class. 11197 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11198 Diag(New->getLocation(), 11199 diag::err_covariant_return_not_derived) 11200 << New->getDeclName() << NewTy << OldTy; 11201 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11202 return true; 11203 } 11204 11205 // Check if we the conversion from derived to base is valid. 11206 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11207 diag::err_covariant_return_inaccessible_base, 11208 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11209 // FIXME: Should this point to the return type? 11210 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11211 // FIXME: this note won't trigger for delayed access control 11212 // diagnostics, and it's impossible to get an undelayed error 11213 // here from access control during the original parse because 11214 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11215 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11216 return true; 11217 } 11218 } 11219 11220 // The qualifiers of the return types must be the same. 11221 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11222 Diag(New->getLocation(), 11223 diag::err_covariant_return_type_different_qualifications) 11224 << New->getDeclName() << NewTy << OldTy; 11225 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11226 return true; 11227 }; 11228 11229 11230 // The new class type must have the same or less qualifiers as the old type. 11231 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11232 Diag(New->getLocation(), 11233 diag::err_covariant_return_type_class_type_more_qualified) 11234 << New->getDeclName() << NewTy << OldTy; 11235 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11236 return true; 11237 }; 11238 11239 return false; 11240 } 11241 11242 /// \brief Mark the given method pure. 11243 /// 11244 /// \param Method the method to be marked pure. 11245 /// 11246 /// \param InitRange the source range that covers the "0" initializer. 11247 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11248 SourceLocation EndLoc = InitRange.getEnd(); 11249 if (EndLoc.isValid()) 11250 Method->setRangeEnd(EndLoc); 11251 11252 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11253 Method->setPure(); 11254 return false; 11255 } 11256 11257 if (!Method->isInvalidDecl()) 11258 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11259 << Method->getDeclName() << InitRange; 11260 return true; 11261 } 11262 11263 /// \brief Determine whether the given declaration is a static data member. 11264 static bool isStaticDataMember(Decl *D) { 11265 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11266 if (!Var) 11267 return false; 11268 11269 return Var->isStaticDataMember(); 11270 } 11271 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11272 /// an initializer for the out-of-line declaration 'Dcl'. The scope 11273 /// is a fresh scope pushed for just this purpose. 11274 /// 11275 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11276 /// static data member of class X, names should be looked up in the scope of 11277 /// class X. 11278 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11279 // If there is no declaration, there was an error parsing it. 11280 if (D == 0 || D->isInvalidDecl()) return; 11281 11282 // We should only get called for declarations with scope specifiers, like: 11283 // int foo::bar; 11284 assert(D->isOutOfLine()); 11285 EnterDeclaratorContext(S, D->getDeclContext()); 11286 11287 // If we are parsing the initializer for a static data member, push a 11288 // new expression evaluation context that is associated with this static 11289 // data member. 11290 if (isStaticDataMember(D)) 11291 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11292 } 11293 11294 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11295 /// initializer for the out-of-line declaration 'D'. 11296 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11297 // If there is no declaration, there was an error parsing it. 11298 if (D == 0 || D->isInvalidDecl()) return; 11299 11300 if (isStaticDataMember(D)) 11301 PopExpressionEvaluationContext(); 11302 11303 assert(D->isOutOfLine()); 11304 ExitDeclaratorContext(S); 11305 } 11306 11307 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11308 /// C++ if/switch/while/for statement. 11309 /// e.g: "if (int x = f()) {...}" 11310 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11311 // C++ 6.4p2: 11312 // The declarator shall not specify a function or an array. 11313 // The type-specifier-seq shall not contain typedef and shall not declare a 11314 // new class or enumeration. 11315 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11316 "Parser allowed 'typedef' as storage class of condition decl."); 11317 11318 Decl *Dcl = ActOnDeclarator(S, D); 11319 if (!Dcl) 11320 return true; 11321 11322 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11323 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11324 << D.getSourceRange(); 11325 return true; 11326 } 11327 11328 return Dcl; 11329 } 11330 11331 void Sema::LoadExternalVTableUses() { 11332 if (!ExternalSource) 11333 return; 11334 11335 SmallVector<ExternalVTableUse, 4> VTables; 11336 ExternalSource->ReadUsedVTables(VTables); 11337 SmallVector<VTableUse, 4> NewUses; 11338 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11339 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11340 = VTablesUsed.find(VTables[I].Record); 11341 // Even if a definition wasn't required before, it may be required now. 11342 if (Pos != VTablesUsed.end()) { 11343 if (!Pos->second && VTables[I].DefinitionRequired) 11344 Pos->second = true; 11345 continue; 11346 } 11347 11348 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11349 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11350 } 11351 11352 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11353 } 11354 11355 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11356 bool DefinitionRequired) { 11357 // Ignore any vtable uses in unevaluated operands or for classes that do 11358 // not have a vtable. 11359 if (!Class->isDynamicClass() || Class->isDependentContext() || 11360 CurContext->isDependentContext() || 11361 ExprEvalContexts.back().Context == Unevaluated) 11362 return; 11363 11364 // Try to insert this class into the map. 11365 LoadExternalVTableUses(); 11366 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11367 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11368 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11369 if (!Pos.second) { 11370 // If we already had an entry, check to see if we are promoting this vtable 11371 // to required a definition. If so, we need to reappend to the VTableUses 11372 // list, since we may have already processed the first entry. 11373 if (DefinitionRequired && !Pos.first->second) { 11374 Pos.first->second = true; 11375 } else { 11376 // Otherwise, we can early exit. 11377 return; 11378 } 11379 } 11380 11381 // Local classes need to have their virtual members marked 11382 // immediately. For all other classes, we mark their virtual members 11383 // at the end of the translation unit. 11384 if (Class->isLocalClass()) 11385 MarkVirtualMembersReferenced(Loc, Class); 11386 else 11387 VTableUses.push_back(std::make_pair(Class, Loc)); 11388 } 11389 11390 bool Sema::DefineUsedVTables() { 11391 LoadExternalVTableUses(); 11392 if (VTableUses.empty()) 11393 return false; 11394 11395 // Note: The VTableUses vector could grow as a result of marking 11396 // the members of a class as "used", so we check the size each 11397 // time through the loop and prefer indices (which are stable) to 11398 // iterators (which are not). 11399 bool DefinedAnything = false; 11400 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11401 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11402 if (!Class) 11403 continue; 11404 11405 SourceLocation Loc = VTableUses[I].second; 11406 11407 bool DefineVTable = true; 11408 11409 // If this class has a key function, but that key function is 11410 // defined in another translation unit, we don't need to emit the 11411 // vtable even though we're using it. 11412 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11413 if (KeyFunction && !KeyFunction->hasBody()) { 11414 switch (KeyFunction->getTemplateSpecializationKind()) { 11415 case TSK_Undeclared: 11416 case TSK_ExplicitSpecialization: 11417 case TSK_ExplicitInstantiationDeclaration: 11418 // The key function is in another translation unit. 11419 DefineVTable = false; 11420 break; 11421 11422 case TSK_ExplicitInstantiationDefinition: 11423 case TSK_ImplicitInstantiation: 11424 // We will be instantiating the key function. 11425 break; 11426 } 11427 } else if (!KeyFunction) { 11428 // If we have a class with no key function that is the subject 11429 // of an explicit instantiation declaration, suppress the 11430 // vtable; it will live with the explicit instantiation 11431 // definition. 11432 bool IsExplicitInstantiationDeclaration 11433 = Class->getTemplateSpecializationKind() 11434 == TSK_ExplicitInstantiationDeclaration; 11435 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11436 REnd = Class->redecls_end(); 11437 R != REnd; ++R) { 11438 TemplateSpecializationKind TSK 11439 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11440 if (TSK == TSK_ExplicitInstantiationDeclaration) 11441 IsExplicitInstantiationDeclaration = true; 11442 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11443 IsExplicitInstantiationDeclaration = false; 11444 break; 11445 } 11446 } 11447 11448 if (IsExplicitInstantiationDeclaration) 11449 DefineVTable = false; 11450 } 11451 11452 // The exception specifications for all virtual members may be needed even 11453 // if we are not providing an authoritative form of the vtable in this TU. 11454 // We may choose to emit it available_externally anyway. 11455 if (!DefineVTable) { 11456 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11457 continue; 11458 } 11459 11460 // Mark all of the virtual members of this class as referenced, so 11461 // that we can build a vtable. Then, tell the AST consumer that a 11462 // vtable for this class is required. 11463 DefinedAnything = true; 11464 MarkVirtualMembersReferenced(Loc, Class); 11465 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11466 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11467 11468 // Optionally warn if we're emitting a weak vtable. 11469 if (Class->hasExternalLinkage() && 11470 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11471 const FunctionDecl *KeyFunctionDef = 0; 11472 if (!KeyFunction || 11473 (KeyFunction->hasBody(KeyFunctionDef) && 11474 KeyFunctionDef->isInlined())) 11475 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11476 TSK_ExplicitInstantiationDefinition 11477 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11478 << Class; 11479 } 11480 } 11481 VTableUses.clear(); 11482 11483 return DefinedAnything; 11484 } 11485 11486 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11487 const CXXRecordDecl *RD) { 11488 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11489 E = RD->method_end(); I != E; ++I) 11490 if ((*I)->isVirtual() && !(*I)->isPure()) 11491 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11492 } 11493 11494 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11495 const CXXRecordDecl *RD) { 11496 // Mark all functions which will appear in RD's vtable as used. 11497 CXXFinalOverriderMap FinalOverriders; 11498 RD->getFinalOverriders(FinalOverriders); 11499 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11500 E = FinalOverriders.end(); 11501 I != E; ++I) { 11502 for (OverridingMethods::const_iterator OI = I->second.begin(), 11503 OE = I->second.end(); 11504 OI != OE; ++OI) { 11505 assert(OI->second.size() > 0 && "no final overrider"); 11506 CXXMethodDecl *Overrider = OI->second.front().Method; 11507 11508 // C++ [basic.def.odr]p2: 11509 // [...] A virtual member function is used if it is not pure. [...] 11510 if (!Overrider->isPure()) 11511 MarkFunctionReferenced(Loc, Overrider); 11512 } 11513 } 11514 11515 // Only classes that have virtual bases need a VTT. 11516 if (RD->getNumVBases() == 0) 11517 return; 11518 11519 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11520 e = RD->bases_end(); i != e; ++i) { 11521 const CXXRecordDecl *Base = 11522 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11523 if (Base->getNumVBases() == 0) 11524 continue; 11525 MarkVirtualMembersReferenced(Loc, Base); 11526 } 11527 } 11528 11529 /// SetIvarInitializers - This routine builds initialization ASTs for the 11530 /// Objective-C implementation whose ivars need be initialized. 11531 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11532 if (!getLangOpts().CPlusPlus) 11533 return; 11534 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11535 SmallVector<ObjCIvarDecl*, 8> ivars; 11536 CollectIvarsToConstructOrDestruct(OID, ivars); 11537 if (ivars.empty()) 11538 return; 11539 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11540 for (unsigned i = 0; i < ivars.size(); i++) { 11541 FieldDecl *Field = ivars[i]; 11542 if (Field->isInvalidDecl()) 11543 continue; 11544 11545 CXXCtorInitializer *Member; 11546 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11547 InitializationKind InitKind = 11548 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11549 11550 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11551 ExprResult MemberInit = 11552 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11553 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11554 // Note, MemberInit could actually come back empty if no initialization 11555 // is required (e.g., because it would call a trivial default constructor) 11556 if (!MemberInit.get() || MemberInit.isInvalid()) 11557 continue; 11558 11559 Member = 11560 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11561 SourceLocation(), 11562 MemberInit.takeAs<Expr>(), 11563 SourceLocation()); 11564 AllToInit.push_back(Member); 11565 11566 // Be sure that the destructor is accessible and is marked as referenced. 11567 if (const RecordType *RecordTy 11568 = Context.getBaseElementType(Field->getType()) 11569 ->getAs<RecordType>()) { 11570 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11571 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11572 MarkFunctionReferenced(Field->getLocation(), Destructor); 11573 CheckDestructorAccess(Field->getLocation(), Destructor, 11574 PDiag(diag::err_access_dtor_ivar) 11575 << Context.getBaseElementType(Field->getType())); 11576 } 11577 } 11578 } 11579 ObjCImplementation->setIvarInitializers(Context, 11580 AllToInit.data(), AllToInit.size()); 11581 } 11582 } 11583 11584 static 11585 void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11586 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11587 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11588 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11589 Sema &S) { 11590 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11591 CE = Current.end(); 11592 if (Ctor->isInvalidDecl()) 11593 return; 11594 11595 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11596 11597 // Target may not be determinable yet, for instance if this is a dependent 11598 // call in an uninstantiated template. 11599 if (Target) { 11600 const FunctionDecl *FNTarget = 0; 11601 (void)Target->hasBody(FNTarget); 11602 Target = const_cast<CXXConstructorDecl*>( 11603 cast_or_null<CXXConstructorDecl>(FNTarget)); 11604 } 11605 11606 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11607 // Avoid dereferencing a null pointer here. 11608 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11609 11610 if (!Current.insert(Canonical)) 11611 return; 11612 11613 // We know that beyond here, we aren't chaining into a cycle. 11614 if (!Target || !Target->isDelegatingConstructor() || 11615 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11616 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11617 Valid.insert(*CI); 11618 Current.clear(); 11619 // We've hit a cycle. 11620 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11621 Current.count(TCanonical)) { 11622 // If we haven't diagnosed this cycle yet, do so now. 11623 if (!Invalid.count(TCanonical)) { 11624 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11625 diag::warn_delegating_ctor_cycle) 11626 << Ctor; 11627 11628 // Don't add a note for a function delegating directly to itself. 11629 if (TCanonical != Canonical) 11630 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11631 11632 CXXConstructorDecl *C = Target; 11633 while (C->getCanonicalDecl() != Canonical) { 11634 const FunctionDecl *FNTarget = 0; 11635 (void)C->getTargetConstructor()->hasBody(FNTarget); 11636 assert(FNTarget && "Ctor cycle through bodiless function"); 11637 11638 C = const_cast<CXXConstructorDecl*>( 11639 cast<CXXConstructorDecl>(FNTarget)); 11640 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11641 } 11642 } 11643 11644 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11645 Invalid.insert(*CI); 11646 Current.clear(); 11647 } else { 11648 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11649 } 11650 } 11651 11652 11653 void Sema::CheckDelegatingCtorCycles() { 11654 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11655 11656 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11657 CE = Current.end(); 11658 11659 for (DelegatingCtorDeclsType::iterator 11660 I = DelegatingCtorDecls.begin(ExternalSource), 11661 E = DelegatingCtorDecls.end(); 11662 I != E; ++I) 11663 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11664 11665 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11666 (*CI)->setInvalidDecl(); 11667 } 11668 11669 namespace { 11670 /// \brief AST visitor that finds references to the 'this' expression. 11671 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11672 Sema &S; 11673 11674 public: 11675 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11676 11677 bool VisitCXXThisExpr(CXXThisExpr *E) { 11678 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11679 << E->isImplicit(); 11680 return false; 11681 } 11682 }; 11683 } 11684 11685 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11686 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11687 if (!TSInfo) 11688 return false; 11689 11690 TypeLoc TL = TSInfo->getTypeLoc(); 11691 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11692 if (!ProtoTL) 11693 return false; 11694 11695 // C++11 [expr.prim.general]p3: 11696 // [The expression this] shall not appear before the optional 11697 // cv-qualifier-seq and it shall not appear within the declaration of a 11698 // static member function (although its type and value category are defined 11699 // within a static member function as they are within a non-static member 11700 // function). [ Note: this is because declaration matching does not occur 11701 // until the complete declarator is known. - end note ] 11702 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11703 FindCXXThisExpr Finder(*this); 11704 11705 // If the return type came after the cv-qualifier-seq, check it now. 11706 if (Proto->hasTrailingReturn() && 11707 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 11708 return true; 11709 11710 // Check the exception specification. 11711 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11712 return true; 11713 11714 return checkThisInStaticMemberFunctionAttributes(Method); 11715 } 11716 11717 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11718 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11719 if (!TSInfo) 11720 return false; 11721 11722 TypeLoc TL = TSInfo->getTypeLoc(); 11723 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11724 if (!ProtoTL) 11725 return false; 11726 11727 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11728 FindCXXThisExpr Finder(*this); 11729 11730 switch (Proto->getExceptionSpecType()) { 11731 case EST_Uninstantiated: 11732 case EST_Unevaluated: 11733 case EST_BasicNoexcept: 11734 case EST_DynamicNone: 11735 case EST_MSAny: 11736 case EST_None: 11737 break; 11738 11739 case EST_ComputedNoexcept: 11740 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11741 return true; 11742 11743 case EST_Dynamic: 11744 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11745 EEnd = Proto->exception_end(); 11746 E != EEnd; ++E) { 11747 if (!Finder.TraverseType(*E)) 11748 return true; 11749 } 11750 break; 11751 } 11752 11753 return false; 11754 } 11755 11756 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11757 FindCXXThisExpr Finder(*this); 11758 11759 // Check attributes. 11760 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11761 A != AEnd; ++A) { 11762 // FIXME: This should be emitted by tblgen. 11763 Expr *Arg = 0; 11764 ArrayRef<Expr *> Args; 11765 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11766 Arg = G->getArg(); 11767 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11768 Arg = G->getArg(); 11769 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11770 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11771 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11772 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11773 else if (ExclusiveLockFunctionAttr *ELF 11774 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11775 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11776 else if (SharedLockFunctionAttr *SLF 11777 = dyn_cast<SharedLockFunctionAttr>(*A)) 11778 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11779 else if (ExclusiveTrylockFunctionAttr *ETLF 11780 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11781 Arg = ETLF->getSuccessValue(); 11782 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11783 } else if (SharedTrylockFunctionAttr *STLF 11784 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11785 Arg = STLF->getSuccessValue(); 11786 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11787 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11788 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11789 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11790 Arg = LR->getArg(); 11791 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11792 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11793 else if (ExclusiveLocksRequiredAttr *ELR 11794 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11795 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11796 else if (SharedLocksRequiredAttr *SLR 11797 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11798 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11799 11800 if (Arg && !Finder.TraverseStmt(Arg)) 11801 return true; 11802 11803 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11804 if (!Finder.TraverseStmt(Args[I])) 11805 return true; 11806 } 11807 } 11808 11809 return false; 11810 } 11811 11812 void 11813 Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11814 ArrayRef<ParsedType> DynamicExceptions, 11815 ArrayRef<SourceRange> DynamicExceptionRanges, 11816 Expr *NoexceptExpr, 11817 SmallVectorImpl<QualType> &Exceptions, 11818 FunctionProtoType::ExtProtoInfo &EPI) { 11819 Exceptions.clear(); 11820 EPI.ExceptionSpecType = EST; 11821 if (EST == EST_Dynamic) { 11822 Exceptions.reserve(DynamicExceptions.size()); 11823 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11824 // FIXME: Preserve type source info. 11825 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11826 11827 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11828 collectUnexpandedParameterPacks(ET, Unexpanded); 11829 if (!Unexpanded.empty()) { 11830 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11831 UPPC_ExceptionType, 11832 Unexpanded); 11833 continue; 11834 } 11835 11836 // Check that the type is valid for an exception spec, and 11837 // drop it if not. 11838 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11839 Exceptions.push_back(ET); 11840 } 11841 EPI.NumExceptions = Exceptions.size(); 11842 EPI.Exceptions = Exceptions.data(); 11843 return; 11844 } 11845 11846 if (EST == EST_ComputedNoexcept) { 11847 // If an error occurred, there's no expression here. 11848 if (NoexceptExpr) { 11849 assert((NoexceptExpr->isTypeDependent() || 11850 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11851 Context.BoolTy) && 11852 "Parser should have made sure that the expression is boolean"); 11853 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11854 EPI.ExceptionSpecType = EST_BasicNoexcept; 11855 return; 11856 } 11857 11858 if (!NoexceptExpr->isValueDependent()) 11859 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11860 diag::err_noexcept_needs_constant_expression, 11861 /*AllowFold*/ false).take(); 11862 EPI.NoexceptExpr = NoexceptExpr; 11863 } 11864 return; 11865 } 11866 } 11867 11868 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11869 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11870 // Implicitly declared functions (e.g. copy constructors) are 11871 // __host__ __device__ 11872 if (D->isImplicit()) 11873 return CFT_HostDevice; 11874 11875 if (D->hasAttr<CUDAGlobalAttr>()) 11876 return CFT_Global; 11877 11878 if (D->hasAttr<CUDADeviceAttr>()) { 11879 if (D->hasAttr<CUDAHostAttr>()) 11880 return CFT_HostDevice; 11881 else 11882 return CFT_Device; 11883 } 11884 11885 return CFT_Host; 11886 } 11887 11888 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11889 CUDAFunctionTarget CalleeTarget) { 11890 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11891 // Callable from the device only." 11892 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11893 return true; 11894 11895 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11896 // Callable from the host only." 11897 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11898 // Callable from the host only." 11899 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11900 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11901 return true; 11902 11903 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11904 return true; 11905 11906 return false; 11907 } 11908